CN100486088C - Load drive apparatus - Google Patents
Load drive apparatus Download PDFInfo
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- CN100486088C CN100486088C CNB200710096525XA CN200710096525A CN100486088C CN 100486088 C CN100486088 C CN 100486088C CN B200710096525X A CNB200710096525X A CN B200710096525XA CN 200710096525 A CN200710096525 A CN 200710096525A CN 100486088 C CN100486088 C CN 100486088C
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Abstract
A load drive apparatus includes a noise filter, which includes a coil connected in series between a power source and a load, and a switching transistor connected in parallel across the coil, and a control circuit which is operated based on a drive signal. The control circuit turns on the switching transistor of the noise filter in case of subjecting the load to a full-on drive, thereby to short-circuit the coil and to form a power supply path including the switching transistor without the coil. The control circuit turns off the switching transistor of the noise filter in case of subjecting the load to a PWM drive, thereby to form a power supply path including the coil.
Description
Technical field
The present invention relates to a kind of load drive device, it drives electric loading by applying supply voltage.
Background technology
Conventional load driving circuits is to carrying out switch control such as the such electric loading of motor, and such load driving circuits adopts noise filter to reduce the noise that occurs when switching load.Yet, in such noise filter, be that coil is used as resistor, therefore reduced the supply power voltage of supply load.
To this, a kind of method that reduces the loss of noise filter has been proposed in JP 2001-23809A and JP 2001-23811A.Particularly, adopted powder (a kind of composite magnetic material of the high magnetic permeability) conduct of Fe-Ni base magnetically soft alloy to be used for the high performance metal composite magnetic material of noise filter, and used by this powder being carried out the compressing powder magnetic core that compression forming is made.
By means of the method among the JP 2001-23809A, be the material behavior of the magnetic material that noise filter adopted by strengthening, reduced the loss of noise filter.Yet the structure of the structure of this noise filter of employing coil and conventional noise filter is identical, so the resistance of coil can not be eliminated fully.Therefore, the coil in this noise filter has reduced the supply power voltage of wanting supply load.
Summary of the invention
Therefore, an object of the present invention is to provide a kind of load drive device, it can reduce the loss of noise filter.
According to an aspect, a kind of load drive device with the power drives load comprises noise filter and is used for noise filter and the control circuit of load.First switch is provided,, standard-sized sheet has been carried out in load drive (full-on drive) or switch drive (switching drive) to power to the load from power supply by control.Noise filter comprises coil and second switch.Coil is connected between power supply and the load, and second switch is in parallel with at least a portion of coil.Control circuit drives load by turning on and off first switch.Control circuit turn-offs second switch, thus the noise that appears on the supply path that comprises coil is carried out filtering.Control circuit is connected second switch, makes at least a portion short circuit of the coil between power supply and the load thus.
Be noted that switch drive comprises that PWM drives and task driven (duty drive) the two.In PWM drove, pulse duration changed and the interval of pulse remains unchanged.In task driven, the cycle of connection changed in the predetermined cycle.
Description of drawings
From the detailed description that provides below in conjunction with accompanying drawing, it is more apparent that above and other objects of the present invention, feature and advantage will become.In the accompanying drawings:
Fig. 1 is the circuit diagram according to the DC control device of electric motor of the first embodiment of the present invention;
Fig. 2 is the flow chart that is used for driving according to the drive signal of first embodiment driving process of PWM oxide-semiconductor control transistors;
Fig. 3 carries out under PWM drives or standard-sized sheet drives the situation load in first embodiment, imposes on the signal graph of waveform of the voltage and current of load;
Fig. 4 is the circuit diagram of DC control device of electric motor according to a second embodiment of the present invention;
Fig. 5 is the block diagram of the DC control device of electric motor of a third embodiment in accordance with the invention;
Fig. 6 is the circuit diagram of the three-phase brushless motor control device of a fourth embodiment in accordance with the invention;
Fig. 7 A and 7B carry out imposing on the voltage waveform of each transistorized grid of inverter cell under the situation of threephase switch driving to load in the 4th embodiment;
Fig. 8 be in the 4th embodiment when switching transistor be switched on/when turn-offing, the performance plot of the relation between the caloric value of the relation between the inductance of coil and the radio noise (radio noise) and the inductance of coil and coil; And
Fig. 9 is the block diagram of three-phase brushless motor control device according to a fifth embodiment of the invention.
Embodiment
(first embodiment)
With reference to figure 1, show first embodiment, DC motor control system S1 comprises power supply (dc voltage storage battery) 10, load drive device 20 and load (DC motor) 30.
Particularly, in noise filter 21, II type CLC noise filter is made of two capacitor 21a and 21b and coil 21c.Carry out noise removing by this II type noise filter.In addition, coil 21c is connected between power supply 10 and the load 30.
Switching transistor 21d is connected at least a portion of coil 21c.More specifically, the drain electrode of switching transistor 21d and source electrode are connected respectively to the two ends of coil 21c, and its grid is connected to control circuit 22.In addition, switching signal is input to the grid of switching transistor 21d from control circuit 22, connect thus/stopcock transistor 21d.In this embodiment, for example, adopt N channel-style MOSFET to be used as switching transistor 21d.
In addition, be supplied under the situation that is used for load 30 carried out the control signal that pulse-width modulation (PWM) drives at control circuit 22, it generates the load signal corresponding to the pulse duration in the PWM driving, and this load signal outputed to PWM oxide-semiconductor control transistors 24, thus PWM oxide-semiconductor control transistors 24 is carried out PWM and drive.In addition, owing to according to PWM control, switching noise occurred in PWM oxide-semiconductor control transistors 24, so control circuit 22 output switching signals come stopcock transistor 21d, so that eliminate noise by noise filter 21.
PWM oxide-semiconductor control transistors 24 is used for PWM control is carried out in load 30.This PWM oxide-semiconductor control transistors 24 is connected between the earth terminal of the low side of load 30 and circuit, and its grid is connected to control circuit 22.In addition, load signal is input to the grid of PWM oxide-semiconductor control transistors 24 from control circuit 22, thereby PWM oxide-semiconductor control transistors 24 is recently carried out switch drive to load 30 according to the duty of this load signal.In this embodiment, for example, adopt N channel-style MOSFET to be used as PWM oxide-semiconductor control transistors 24.
The standard-sized sheet driving is carried out in 22 pairs of loads of control circuit 30 or PWM drives, and the DC motor, and for example the motor of hair-dryer in the motor of fan, fuel pump motor, the air-conditioning can be used as load 30.
Next, the operation of DC motor control system S1 is described with reference to driver shown in Figure 2.This program is used for driving PWM oxide-semiconductor control transistors 24 according to drive signal, and this program is carried out by control circuit 22.When supply power voltage was supplied to load drive device 20, this drive controlling process began.
In step 110, at first carry out initialization, make the switching transistor 21d of noise filter 21 be turned off.Particularly, control circuit 22 generates the switching signal that is used for stopcock transistor 21d, and it is outputed to switching transistor 21d, thus switching transistor 21d is turn-offed.
In step 120, come to load 20 energisings according to drive signal as the energising module.More specifically, according to the duty ratio that is input to the drive signal of control circuit 22 from the outside, generation is used for the load signal that standard-sized sheet drives or PWM drives is carried out in load 30, and this signal is input to PWM oxide-semiconductor control transistors 24, drives load 30 according to this load signal thus.
As shown in Figure 3, load 30 is being carried out under the situation that PWM drives or standard-sized sheet drives, voltage (VM) and electric current (IP) are applied in to load 30.Under the situation that the PWM of load 30 drives, PWM oxide-semiconductor control transistors 24 is carried out switch drive, thus the voltage after the shaping pulse is imposed on load 30, and corresponding to this voltage, electric current flows through load 30.In this case, switching noise occurred, so the noise removing that noise filter 21 carries out is very necessary.
In addition, as shown in Figure 3, under the situation that the standard-sized sheet of load 30 drives, PWM oxide-semiconductor control transistors 24 is connected constantly, enter lasting "on" position to make load 30, and maximum current flows through load 30.In this case, the switching noise that causes owing to PWM oxide-semiconductor control transistors 24 can't occur, so noise filter 21 is also nonessential.In this case, need to reduce the loss of noise filter 21.
Therefore, in step 130, check whether load 30 is in switch drive (PWM driving) as the switch drive judging module.Be in that standard-sized sheet drives but not under the situation that PWM drives in load 30, execution in step 140.Be under the situation of PWM driving execution in step 150 in load 30.
In the step 140 as the standard-sized sheet driver module, because the standard-sized sheet of load 30 drives, the two ends of the coil 21c of noise filter 21 are all by short circuit.Particularly, export the switching signal that is used to connect switching transistor 21d, thus switching transistor 21d is connected from control circuit 22.Like this, between power supply 10 and load 30, form one wherein the two ends of the coil 21d of noise filter 21 make it possible to reduce because the loss of the power supply 10 that the resistance of coil 21c causes all by the path of short circuit.That is to say,, therefore can reduce the loss of power supply 10 owing to the resistance that resistance is lower than coil 21c of opening of transistor 21d.
In step 150,, between power supply 10 and load 30, form a path of extending via the coil 21c of noise filter 21 because the PWM of load 30 drives as switch drive module.Particularly, after load signal Be Controlled circuit 22 generated, it was output to PWM oxide-semiconductor control transistors 24, and PWM oxide-semiconductor control transistors 24 is carried out the PWM driving.In addition, in the process of PWM oxide-semiconductor control transistors 24 being carried out the PWM driving, in PWM oxide-semiconductor control transistors 24 switching noise appears.Therefore, in order to eliminate noise in noise filter 21, control circuit 22 generates the switching signal of the switching transistor 21d that is used to turn-off noise filter 21.Like this, between power supply 10 and load 30, formed the path that extends through noise filter 21, so that can eliminate the switching noise that occurs owing to PWM oxide-semiconductor control transistors 24.
In step 160, check and whether imported drive signal.That is to say whether monitoring external drive signal exists to the input of control circuit 22.When determining not input drive signal in this step, the driving of load 30 finishes.On the other hand, when when step 160 is determined to have imported drive signal, this processing turns back to step 120, and in this step 120, corresponding to this drive signal, load 30 is switched on once more.Therefore, when drive signal is imported into control circuit 22, repeating step 120-160.A drive cycle (wherein step 160 turns back to step 120) for example is 4ms-40ms.
According to first embodiment, switching transistor 21d is in parallel with the coil 21c of noise filter 21, and under the situation of load 30 being carried out standard-sized sheet driving (just continuing out to drive), coil 21c is by short circuit.
More specifically, under the situation that the standard-sized sheet of load 30 drives, PWM oxide-semiconductor control transistors 24 is connected constantly, therefore can't be owing to switching noise appears in PWM oxide-semiconductor control transistors 24.So, do not need noise filter 21 to carry out noise removing, so switching transistor 21d is switched on with coil 21c short circuit, can reduce thus because the loss of the power supply 10 that coil 21c causes.
In this embodiment, adopt MOSFET, so that can realize its low resistance of opening as switching transistor 21d.
In addition, under the situation of load 30 being carried out the PWM driving, PWM oxide-semiconductor control transistors 24 is carried out switch drive, therefore owing to switching noise has appearred in PWM oxide-semiconductor control transistors 24.So switching transistor 21d is turned off, can eliminate switching noise by noise filter 21 thus.
(second embodiment)
In this embodiment, as shown in Figure 4, employing relay 21e conduct is used for the switch module with two terminal shortcircuits of the coil 21c of noise filter 21.This relay 21e for example comprises switch and electromagnet, and the contact of this switch is connected according to the excitation of this electromagnet or disconnects.
More specifically, control circuit 22 generates the signal of the switch that is used for connecting/turn-off relay 21e as switching signal.In addition, control circuit 22 makes an electric current flow through the electromagnet of relay 21e based on this switching signal, thus with this switch connection/shutoff, so that two terminal shortcircuit/disconnections of coil 21c.
(the 3rd embodiment)
In this embodiment, as shown in Figure 5, control circuit 22 by customer designed IC (IC) but not microcomputer constitute.Particularly, load drive device 20 comprises noise filter 21, control circuit 22 and the drive circuit 25 that comprises PWM oxide-semiconductor control transistors 24.Identical among noise filter 21 and first embodiment, and it is configured to make switching transistor 21d to be connected across on the coil 21c.
In operation, the drive signal that is used to drive load 30 is the input signal processor circuit 22a that is input to control circuit 22 from the outside.In input signal processor circuit 22a, generated the signal of opening that is used for load 30 is carried out the standard-sized sheet driving, and be entered into power on signal generator circuit 22b.Like this, in power on signal generator circuit 22b, generated the switching signal of the switching transistor 21d that is used to connect noise filter 21, and be entered into noise filter 21.In noise filter 21, according to the switching signal from power on signal generator circuit 22b input, switching transistor 21d is switched on, and the two ends of coil 21c are by short circuit thus.
In addition, in power on signal generator circuit 22b, the signal of opening according to input has generated the load signal that is used to make PWM oxide-semiconductor control transistors 24 normal opens or connects PWM oxide-semiconductor control transistors 24 constantly, and has been entered into drive circuit 25.Like this, in drive circuit 25, according to this load signal, the standard-sized sheet of carrying out load 30 drives, and in this standard-sized sheet drove, PWM oxide-semiconductor control transistors 24 was normal opens.
On the other hand, in the drive signal that is input to control circuit 30 from the outside is to be used for load 30 is carried out under the situation of PWM driving, in input signal processor circuit 22a, generate the signal of opening that is used for load 30 is carried out the PWM driving, and be entered into power on signal generator circuit 22b.Under the situation that the PWM of load 30 drives, this is opened signal and comprises duty cycle information.
In addition, in power on signal generator circuit 22b, generated the switching signal of the switching transistor 21d that is used to turn-off noise filter 21, and be entered into switching transistor 21d.Like this, in noise filter 21, switching transistor 21d is turned off, and starts the operation of noise filter thus.
In addition, in power on signal generator circuit 22b, generated the load signal that is used for load 30 is carried out the PWM driving, and be entered into drive circuit 25.Like this, in drive circuit 25, the PWM that carries out load 30 drives, and in this PWM drives, according to this load signal PWM oxide-semiconductor control transistors 24 is carried out switch drive.
As mentioned above, even control circuit 22 is made of customization IC, according to load 30 being carried out situation that standard-sized sheet drives or it is carried out the situation that PWM drives, the switching transistor 21d that is connected on the two ends of coil 21c of noise filter 21 can be by short circuit or disconnection.
(the 4th embodiment)
This embodiment is the three-phase brushless motor control system S2 at as shown in Figure 6.Three-phase brushless motor control system S2 has phase inverter circuit 26 in the load drive device 20 that comprises noise filter 21 and control circuit 22, this phase inverter circuit is used for that threephase switch is carried out in load 30 and drives.
26 pairs of phase inverter circuits carry out three-phase from power supply 10 to the connection/shutoff of the energising of load 30 and control.More specifically, phase inverter circuit 26 applies the per 120 ° of voltages that electrical degree changes of its phase place to the motor as load 30.It comprises three high side transistor 26a, 26c, 26e and three low side transistor 26b, 26d, 26f.In addition, form first path of transistor 26a and 26b, formed second path of transistor 26c and 26d, and formed the Third Road footpath of transistor 26e and 26f.Here, by the switch drive of each low side transistor 26b, 26d and 26f, standard-sized sheet driving or PWM driving are carried out in load 30.Can adopt N channel-style MOSFET as high side transistor 26a, 26c, 26e and low side transistor 26b, 26d, 26f respectively.
In addition, the switching transistor 21d in the noise filter 21 is connected at least a portion of coil 21c.Yet more specifically, switching transistor 21d is not connected on the two ends of coil 21c so that make this coil 21c short circuit, but as shown in Figure 6, and the drain electrode of switching transistor 21d is connected to the mid point A on the path of coil 21c.Like this, coil 21c is configured to make win coil B and the second coil C to be connected on an A, and switching transistor 21d is in such state, and wherein it is in parallel with the second coil C.So switching transistor 21d only makes a part of short circuit of coil 21c, just, only make the second coil C short circuit.
This is because 26 pairs of loads of phase inverter circuit 30 are carried out threephase switch and driven.More specifically, even when being carried out the standard-sized sheet driving at a phase region (phase section) internal burden 30, threephase switch drives and still drives this load 30, and therefore, still switching noise occurs owing to threephase switch drives.So, in order to prevent because threephase switch drives the situation that the two ends dead short circuit of the coil 21c that the switching noise cause can't be by making noise filter 21 is eliminated, switching transistor 21d makes coil 21c partial short circuit, reduced voltage drop or loss among the coil 21c thus, the noise cancellation with noise filter 21 maintains on certain degree simultaneously.
In addition, because load 30 is carried out threephase switch filtering, therefore control unit 22 is according to the drive signal of outside input, generation is used for the load signal that threephase switch drives is carried out in load 30, and described load signal is input to each high side transistor 26a, 26c, 26e and each low side transistor 26b, 26d, 26f, thus threephase switch is carried out in load 30 and drive.
In addition, carried out every kind of situation that standard-sized sheet drives or PWM drives in the mode identical with first and second embodiment corresponding to load 30, control unit 22 generates the switching signal of the switching transistor 21d that is used to connect/turn-off noise filter 21.Three-phase brushless motor control system S2 can carry out threephase switch to load 30 according to flow chart shown in Figure 2 and drive.
In such three-phase brushless motor control system S2, generate the load signal that is input to phase inverter circuit 26 by control circuit 22, waveform is shown in Fig. 7 A or Fig. 7 B.Fig. 7 A or Fig. 7 B show the grid voltage waveform, and in the process of load 30 being carried out the threephase switch driving, described grid voltage waveform is applied to each transistorized grid of phase inverter circuit 26.Voltage U 1, U2, V1, V2, W1 and W2 shown in Fig. 7 A or Fig. 7 B corresponds respectively to the grid voltage of transistor 26a-26f shown in Figure 6.Like this, under the situation that the standard-sized sheet of load 30 drives, the grid voltage waveform shown in Fig. 7 A is imported into phase inverter circuit 26, and under the situation that the PWM of load 30 drives, the grid voltage waveform shown in Fig. 7 B is imported into phase inverter circuit 26.
Under the situation that the standard-sized sheet of load 30 drives, shown in Fig. 7 A, the per 120 ° of voltages that change of its phase place are respectively applied to high side transistor 26a, 26c, 26e.After voltage was applied to high side transistor 26a, 26c, 26e, wherein each all became the voltage of often opening and is respectively applied to low side transistor 26b, 26d, 26f in a phase region.Like this, low side transistor 26b, 26d, 26f are carried out the standard-sized sheet driving for per 120 °.
In this case, the switching transistor 21d of noise filter 21 is in such state, and wherein the switching signal of its Be Controlled circuit 22 generations is connected, so that the second coil C short circuit of coil 21c.Like this, between power supply 10 and load 30, formed a path of extending via the first coil B and the switching transistor 21d of coil 21c.So, in noise filter 21, reduced because threephase switch drives the noise that causes, reduced the loss of power supply 10 simultaneously.
In addition, under the situation that the PWM of load 30 drives, shown in Fig. 7 B, the voltage of the per 120 ° of skews of its phase place is applied to high side transistor 26a, 26c, 26e respectively to drive identical mode with standard-sized sheet.In addition, after voltage was applied to high side transistor 26a, 26c, 26e, the voltage after the shaping pulse was respectively applied to low side transistor 26b, 26d, 26f, and each drives the voltage after the wherein said shaping pulse corresponding to the PWM in the phase region.Like this, low side transistor 26b, 26d, 26f are carried out the PWM driving for per 120 °.
In this case, the switching transistor 21d of noise filter 21 is in such state, and wherein the switching signal of its Be Controlled circuit 22 generations is turn-offed.Like this, between power supply 10 and inverter cell 30, formed a path of extending via the first coil B and the second coil C of coil 21c.So noise filter 21 is used for eliminating switching noise.
Making load 30 be carried out under the situation of three-phase drive by the employing three-phase brushless motor as this embodiment, affirmation can bring following advantage.At first, in noise filter shown in Figure 6 21, the resistance of supposing the first coil B is R
L1, the resistance of opening of switching transistor 21d is R
ONSo, concerning R
L1R
ONUnder the situation about satisfying, because the connection of the switching transistor 21d of noise filter 21, so suppressed the heating of coil 21c.
Fig. 8 show when switching transistor 21d be switched on/when turn-offing, the relation between the caloric value (Δ T) of the relation between the inductance L of coil 21c and the radio noise (dBm) and the inductance L of coil 21c and coil 21c.In the figure, the inductance of the first coil B is denoted as L1 among the coil 21c, and the inductance of the second coil C is denoted as L2.So, under the state that switching transistor 21d is out, formed the path of extending, so the inductance of coil 21c becomes L1 via the first coil B and switching transistor 21d.On the other hand, under the state of switching transistor 21d, formed the path of extending, so the inductance of coil 21c becomes (L1+L2) via the first coil B and the second coil C for the pass.
As shown in Figure 8, radio noise usually and the inductance relation of being inversely proportional to of coil 21c.Therefore, when load 30 was driven (solid line characteristic) and changed into PWM and drive (dotted line characteristic) from standard-sized sheet, radio noise increased.In addition, the heating of coil 21c inductance L common and coil 21c is proportional.Therefore, when load 30 is driven from PWM when being changed into standard-sized sheet and driving, the caloric value of coil 21c increases.
More specifically, be not included in the noise filter 21 and load 30 is driven from PWM and changed under the situation that standard-sized sheet drives at switching transistor 21d, with the state identical state continuance of switching transistor 21d for pass (L=L1+L2), and load 30 is not carried out switch drive, make switching noise reduce, thereby strengthened the level of radio noise, shown in arrow N1 among Fig. 8.Yet because the electric current that flows through load 30 increased, so the heating of coil 21c increased, shown in arrow H1 among Fig. 8.
On the contrary, as among this embodiment, switching transistor 21d is included under the situation in the noise filter 21, in case load 30 is changed into standard-sized sheet from the PWM driving to be driven, switching transistor 21d just is switched on (L=L1), and has formed the path of extending via first coil B among the coil 21c and switching transistor 21d.So the caloric value of coil 21c can being greatly diminished shown in arrow H2 like that, the such radio noise shown in arrow N2 is maintained at identical degree simultaneously, just as the situation of switching transistor 21d for closing.
In addition, as shown in Figure 8, the predetermined threshold value of predetermined threshold value that can be by radio noise is set and the heating of coil 21c is suitably controlled radio noise and heating.Particularly, load 30 is carried out standard-sized sheet and drives, and coil 21c is by switching transistor 21d short circuit, so that have an inductance value that satisfies the predetermined threshold value of radio noise, the predetermined threshold value of radio noise is satisfied in the heating that can reduce coil 21c thus simultaneously.
As mentioned above, adopting under the situation of three-phase brushless motor as load 30,, driven transistor also to change, switching noise therefore occurring with each phase region even when load 30 is carried out the standard-sized sheet driving.Yet the second coil C short circuit by switching transistor 21d as shown in Figure 6 makes coil 21c in noise filter 21 can reduce the loss of power supply 10 thus, and can keep noise cancellation.
In addition, under the situation of three-phase drive load 30, considered standard-sized sheet drive and switch drive in, the change noise that the frequency owing to connection/shutoff of each transistor 26a-26e that is used to change phase inverter circuit 26 causes all can appear.So in two kinds of drive schemes, the first coil B that makes noise filter 21 can eliminate the noise that changes on the frequency thus as noise filter.
(the 5th embodiment)
This embodiment is similar to the 4th embodiment, but control circuit 22 is made of customization IC but not microcomputer as shown in Figure 9.In this embodiment, load drive device 20 comprises noise filter 21, control circuit 22 and phase inverter circuit 26.Identical among noise filter 21 and the 4th embodiment, and it is configured to connect the switching transistor 21d of the second coil C short circuit that is used to make coil 21c.
In addition, in this embodiment, control circuit 22 comprises position detector circuit 22c.Position detector circuit 22c detects the position of rotation as the three-phase brushless motor of load 30.In control circuit 22, when power on signal generator circuit 22b by supplied from input signal processor circuit 22a be used for to load 30 carry out that threephase switch drives open signal the time, it is opened signal based on this and generates the load signal that is used for load 30 is carried out the threephase switch driving, and this load signal is outputed to phase inverter circuit 26.
In addition, phase inverter circuit 26 is according to the load signal from power on signal generator circuit 22b input, and the standard-sized sheet that load 30 is carried out three-phase drives or the PWM driving.In this case, the voltage signal that outputs to load 30 from phase inverter circuit 26 is fed return and puts detector circuit 22c, and is used to detect the position of rotation of load 30.In addition, the rotary position information that position detector circuit 22c obtains is imported into input signal processor circuit 22a, and is used to proofread and correct three-phase drive in the process of signal is opened in generation.
Even when adopting three-phase brushless motor to constitute by customization IC as load 30 and control circuit 22, carry out the situation that PWM drives corresponding to the situation of load 30 being carried out the standard-sized sheet driving or to it, the second coil C of coil 21c can be reduced because its loss that the resistance of coil 21c causes thus by the switching transistor 21d short circuit of noise filter 21.
(other embodiment)
In each of the foregoing description, various modifications and to replace all be possible.For example, also can adopt the LC mode filter as noise filter 21.All or part of can substituting among N channel- style MOSFET 21d, 24, the 26a-26f with P channel-style MOSFET.In these embodiments, transistor 21d can be in parallel with at least a portion of coil 21c.
Claims (3)
1, a kind of load drive device (20) that is used for driving with power supply (10) load (30) comprising:
Noise filter (21), this noise filter comprise the coil (21c) that is connected between described power supply (10) and the described load (30);
First switch module (24,26) is used for controlling from described power supply to described electric; And
Control circuit (22) is used for driving described load by turning on and off described first switch module,
It is characterized in that:
Described coil (21c) comprises first coil (B) and second coil (C) of mutual series connection;
Described first switch module (24,26) comprises phase inverter circuit (26);
Described control circuit (22) drives described load based on applying from outside drive signal by standard-sized sheet driving or switch drive;
Described noise filter (21) also comprises the second switch module (21d, 21e) with described second coils from parallel connection of coils;
Described control circuit (22) is connected described second switch module, so that described second coil short and the supply path that only comprises described first coil is provided, and drive by the standard-sized sheet that described phase inverter circuit is carried out described load, make described load be driven by standard-sized sheet; And
Described control circuit (22) turn-offs described second switch module, so that the supply path that comprises described first coil and described second coil to be provided, and carries out the switch drive of described load by described phase inverter circuit, makes described load by switch drive.
2, load drive device as claimed in claim 1 (20), wherein, described control circuit (22) comprising:
Energising module (120), be used for generating the load signal that is used for described load is carried out described standard-sized sheet driving or described switch drive based on described drive signal, and described load signal outputed to described first switch module, drive described load by described phase inverter circuit thus;
Switch drive is checked module (130), is used for checking based on the described load signal that described energising module generates whether described load is in described switch drive;
Standard-sized sheet driver module (140), be used for determining that in described switch drive inspection module described load is not under the situation of described switch drive, output is used to connect the switching signal of the second switch module of described noise filter, connect described second switch module thus and make described second coil short, and between described power supply and described phase inverter circuit, form the supply path that comprises described first coil and described second switch module, and be used for the load signal that described standard-sized sheet drives is carried out in described load to described phase inverter circuit output; And
Switch drive module (150), be used for determining that in described switch drive inspection module described load is under the situation of described switch drive, output is used to turn-off the switching signal of the second switch module of described noise filter, turn-off described second switch module thus and between described power supply and described phase inverter circuit, form the supply path that comprises described first coil and described second coil, and be used for described load is carried out the load signal of described switch drive to described phase inverter circuit output.
3, load drive device as claimed in claim 1 (20), wherein, described control circuit (22) comprising:
Position detector circuit (22c) is used to detect the position of rotation as the motor of described load;
Input signal treatment circuit (22a), be used for based on of the position signalling work of described drive signal with the position of rotation of the described load of indicating described position detector electric circuit inspection to arrive, undertaken by described phase inverter circuit in described load under the situation of described standard-sized sheet driving, output is used to connect the switching signal of the second switch module of described noise filter, make described second coil short thus and between described power supply and described phase inverter circuit, form the supply path that comprises described first coil and described second switch module, and generation is used for described load is carried out the signal of opening of described standard-sized sheet driving, and be carried out in described load under the situation of described switch drive, output is used to turn-off the switching signal of the second switch module of described noise filter, turn-off described second switch module thus and between described power supply and described phase inverter circuit, form the supply path that comprises described first coil and described second coil, and generate the signal of opening that is used for described load is carried out described switch drive; And
Power on signal generator circuit (22b), be used in response to the described signal of opening from described input signal processor circuit input, generation is used for by described phase inverter circuit described load being carried out that described standard-sized sheet drives or the load signal of described switch drive, by described phase inverter circuit described standard-sized sheet is carried out in described load thus and drives or described switch drive.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006109597 | 2006-04-12 | ||
| JP109597/2006 | 2006-04-12 | ||
| JP005955/2007 | 2007-01-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101056056A CN101056056A (en) | 2007-10-17 |
| CN100486088C true CN100486088C (en) | 2009-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200710096525XA Expired - Fee Related CN100486088C (en) | 2006-04-12 | 2007-04-11 | Load drive apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100486088C (en) |
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2007
- 2007-04-11 CN CNB200710096525XA patent/CN100486088C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN101056056A (en) | 2007-10-17 |
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