CN100468932C - Initial voltage establishing circuit for switch type voltage converter - Google Patents
Initial voltage establishing circuit for switch type voltage converter Download PDFInfo
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- CN100468932C CN100468932C CNB2006100941496A CN200610094149A CN100468932C CN 100468932 C CN100468932 C CN 100468932C CN B2006100941496 A CNB2006100941496 A CN B2006100941496A CN 200610094149 A CN200610094149 A CN 200610094149A CN 100468932 C CN100468932 C CN 100468932C
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Abstract
An initial voltage building circuit is provided with a current supplier, a current adjuster, a charge/discharge controller, and a vibration signal generator, wherein the current supplier provides a charge current and a discharge current, the current adjuster adjusts the charge current and the discharge current, the charge/discharge controller selectively allows the charge current and the discharge current, the vibration signal generator uses the charge current and discharge current to generate an initial voltage building signal, to gradually expand one working ration of the initial voltage building signal, and the initial voltage building signal is added on a switch voltage converter to build an initial output voltage.
Description
Invention field
The present invention relates to a kind of initial voltage establishing circuit, relate in particular to a kind of initial voltage establishing circuit that is used for switch type electric voltage converter.
Technical background
Fig. 1 shows the circuit diagram of known switch type electric voltage converter 10.Switch type electric voltage converter 10 is a booster type, is about to lower input voltage V
InBe converted to higher output voltage V
OutInductor L is coupled in input voltage V
InAnd between the switching node SN.Side switch SH is coupled between switching node SN and the output O, and side switch SL then is coupled between switching node SN and ground potential.In addition, output capacitance C
oBe coupled in output O, so that to output voltage V
OutCarry out filtering.In example shown in Figure 1, side switch SH realizes that by the PMOS transistor side switch SL is then realized by nmos pass transistor.11 pairs of drive circuits 12 of control switching circuit apply switch-over control signal CS, to produce upside drive signal PH and downside drive signal PL.Whether upside drive signal PH decision side switch SH conducting, and whether downside drive signal PL determines side switch SL conducting.
Particularly, control switching circuit 11 is based on output voltage V
OutThe work of feedback decision switch-over control signal CS than (Duty Cycle), with output voltage V
OutBe adjusted to a desired value.Control switching circuit 11 has a feedback circuit 13, error amplifier 14, PWM comparator 15, a generating circuit from reference voltage 16 and an oscillating signal generating circuit 17, these assemblies formation coupled to each other structure as shown in the figure.Work as output voltage V
OutWhen being lower than desired value, the switch-over control signal CS that is exported from control switching circuit 11 provides a bigger work ratio, to improve output voltage V
OutWork as output voltage V
OutWhen being higher than desired value, the switch-over control signal CS that exports from control switching circuit 11 provides a less work ratio, to reduce output voltage V
Out
When switched voltage converter 10 has just begun to start, because the output voltage V of output O
OutDo not set up as yet and be in zero potential, make output voltage V
OutAnd with the biggest gap between the desired value, therefore the work ratio from the switch-over control signal CS of control switching circuit 11 outputs extends to maximum.This maximum work ratio causes the long-time conducting of side switch SL, causes a large amount of inrush currents to produce, thereby causes circuit to damage easily.
Summary of the invention
At foregoing problems, the object of the present invention is to provide an initial voltage establishing circuit, be used for setting up an initial output voltage at the output of switch type electric voltage converter, avoid a large amount of inrush currents to cause circuit to damage.
According to an aspect of the present invention, provide a kind of initial voltage establishing circuit that is used for a switch type electric voltage converter.Switch type electric voltage converter converts an input voltage to an output voltage.Initial voltage establishing circuit has: a current providing circuit, a matrix current adjustment circuit, a charge/discharge circuit and an oscillating signal generating circuit.Current providing circuit provides a charging current and a discharging current.Matrix current adjustment circuit is adjusted this charging current and this discharging current.Charging/discharging control circuit optionally allows this charging current and this discharging current to pass through.Oscillating signal generating circuit utilizes this charging current and this discharging current and produces an initial voltage sets up signal, the work ratio that makes this initial voltage set up signal increases gradually, and this work is than being the ratio of this charging current with this charging current and this discharging current sum.Initial voltage is set up signal and is put on drive circuit in this switch type electric voltage converter to set up an initial voltage.
According to a further aspect in the invention, a kind of switch type electric voltage converter is provided, convert an input voltage to an output voltage, this switch type electric voltage converter has: a commutation circuit, an initial voltage establishing circuit, a control switching circuit and a signal selecting circuit.Commutation circuit has one first switch, a second switch and an inductor.This first switch, second switch and this inductor coupled in common are in a switching node.Initial voltage establishing circuit produces an initial voltage and sets up signal.In response to this output voltage, control switching circuit produces a switch-over control signal.When this switch type electric voltage converter began to start, signal selecting circuit allowed this initial voltage to set up signal and puts on this commutation circuit to control this first switch and this second switch, makes this output voltage rise to a predetermined initial output voltage.After this output voltage reached this predetermined initial output voltage, signal selecting circuit allowed this switch-over control signal to be applied to this commutation circuit, to control this first switch and this second switch, this output voltage is adjusted to a predetermined target value.
The following description and accompanying drawing will make the aforementioned purpose of the present invention and other purposes, feature and advantage more obvious.
Description of drawings
Fig. 1 shows the circuit diagram of known switch type electric voltage converter.
Fig. 2 shows the circuit diagram that is provided with according to the switch type electric voltage converter of initial voltage establishing circuit of the present invention.
Fig. 3 shows the detailed circuit diagram according to initial voltage establishing circuit of the present invention.
Fig. 4 shows the waveform sequential chart according to the method for operation of initial voltage establishing circuit of the present invention.
The main element symbol description
10 switch type electric voltage converters
11 control switching circuits
12 drive circuits
13 feedback circuits
14 error amplifiers
15 PMW comparators
16 generating circuit from reference voltage
17 oscillating signal generating circuits
18 initial voltage establishing circuits
19 signal selecting circuits
31 matrix current adjustment circuits
32 current providing circuits
33 charging/discharging control circuits
34 oscillating signal generating circuits
A, the B end points
The SH side switch
The SL side switch
The SN switching node
The O output
The L inductor
V
InInput voltage
V
OutOutput voltage
V
pCrest voltage
C
oOutput capacitance
C
OscConcussion electric capacity
PH upside drive signal
PL downside drive signal
The CS switch-over control signal
The ES initial voltage is set up signal
K1～K12 inverter
The CT counter
Q
0～Q
(n-1)The byte output signal
S1～S8 electric current is adjusted signal
P1～P8 PMOS transistor
N1, the N2 nmos pass transistor
P
ChgCharging transistor
N
DisDischarge transistor
I
ChgCharging current
I
DisDischarging current
Embodiment
Describe in detail below with reference to accompanying drawings according to most preferred embodiment of the present invention.
Fig. 2 shows the circuit diagram according to switch type electric voltage converter 20 of the present invention, wherein is provided with an initial voltage establishing circuit 18.With reference to Fig. 2, switch type electric voltage converter 20 belongs to booster type, is about to lower input voltage V
InBe converted to higher output voltage V
OutInductor L is coupled in input voltage V
InAnd between the switching node SN.Side switch SH is coupled between switching node SN and the output O, side switch SL then be coupled and switching node SN and ground potential between.In addition, output capacitance C
oBe coupled in output O, so that to output voltage V
OutCarry out filtering.In example shown in Figure 2, side switch SH realizes that by the PMOS transistor side switch SL is then realized by nmos pass transistor.Whether side switch SH conducting is by upside drive signal PH decision, and whether side switch SL conducting is determined by downside drive signal PL.
As previously mentioned, in known switch type electric voltage converter 10 shown in Figure 1, upside drive signal PH and downside drive signal PL are produced based on switch-over control signal CS by drive circuit 12, and wherein switch-over control signal CS is produced by control switching circuit 11.
Yet in foundation shown in Figure 2 switch type electric voltage converter 20 of the present invention, initial voltage is set up provides circuit to provide an initial voltage to set up signal ES.When switch type electric voltage converter 20 had just begun to start, signal selecting circuit 19 allowed terminal A to be coupled to drive circuit 12, made initial voltage set up that signal ES puts on drive circuit 12 and produced upside drive signal PH and downside drive signal PL.It is a pulse signal that initial voltage is set up signal ES, and it has the work ratio that increases gradually.Particularly, initial voltage is set up signal ES originally a small work ratio is provided, and subsequent working is than increasing gradually, makes the output voltage V of output O
OutRise to a predetermined initial output voltage gradually from zero potential.Because initial voltage is set up signal ES originally a small work ratio is provided, therefore when switch type electric voltage converter 20 has just begun to start, can prevent effectively that a large amount of inrush currents from producing.
Output voltage V at input O
OutReach after this predetermined initial output voltage, signal selecting circuit 19 transfers to allow terminal B to be coupled to drive circuit 12, makes switch-over control signal CS put on drive circuit 12, and produces upside drive signal PH and downside drive signal PL.In this stage, the operation of switch type electric voltage converter 20 just becomes the well-known operations as aforementioned suitching type voltage controller 10.In other words, control switching circuit 11 has a feedback circuit 13, error amplifier 14, PMW comparator 15, a generating circuit from reference voltage 16 and an oscillating signal generating circuit 17, these assemblies formation coupled to each other structure as shown in the figure.Work as output voltage V
OutWhen being lower than desired value, the switch-over control signal CS that is exported from control switching circuit 11 provides a bigger work ratio, to improve output voltage V
OutWork as output voltage V
OutWhen being higher than desired value, the switch-over control signal CS that is exported from control switching circuit 11 provides a less work ratio, to reduce output voltage V
OutBecause the output voltage V of output O
OutSet up signal ES and be increased to this predetermined initial output voltage, so the work of switch-over control signal CS is than not expanding to maximum by initial voltage.Therefore, switch type electric voltage converter 20 according to the present invention prevents that effectively inrush current from causing circuit to damage.
Fig. 3 shows the detailed circuit diagram according to initial voltage establishing circuit 18 of the present invention.As shown, initial voltage establishing circuit 18 has a matrix current adjustment circuit 31, current providing circuit 32, a charging/discharging control circuit 33 and an oscillating signal generating circuit 34.Under the control of matrix current adjustment circuit 31, current providing circuit 32 provides a charging current I
ChgWith a discharging current I
DisCharging current I
ChgWith discharging current I
DisSize by matrix current adjustment circuit 31 decision.Charging/discharging control circuit 33 optionally allows charging current I
ChgWith discharging current I
DisBy.In the charging stage, charging/discharging control circuit 33 allows charging current I
ChgTo oscillating signal generating circuit 34 chargings.At discharge regime, charging/discharging control circuit 33 allows oscillating signal generating circuit via discharging current I
DisDischarge.By utilizing charging current I
ChgWith discharging current I
Dis, oscillating signal generating circuit 34 provides initial voltage to set up signal ES, and its work ratio is by charging current I
ChgWith discharging current I
DisDecision.Set up signal ES in response to initial voltage, matrix current adjustment circuit 31 is adjusted the charging current I that current providing circuit 32 is provided
ChgWith discharging current I
Dis
Matrix current adjustment circuit 31 mainly utilizes a counter CT to calculate initial voltage and sets up the pulse number of signal ES, and produces electric current adjustment signal S1 to S8 in view of the above to be applied to current providing circuit 32.Counter CT is the counting logical circuit of a n byte, and its input IN receives the pulse number that initial voltage is set up signal.In according to one embodiment of present invention, adopt maximum four byte signal Q (n-4) to produce first to the 8th electric current and adjust signal S1 to S8 to Q (n-1).First electric current is adjusted signal S1 and is produced through inverter K5 and K6 by the 4th byte signal Q (n-4), and second electric current adjustment signal S2 is produced through inverter K5 by the 4th byte signal Q (n-4).Therefore, first and second electric current adjust signal S1 and S2 each other phase difference 180 spend.The 3rd electric current is adjusted signal S3 and is produced through inverter K7 and K8 by the 3rd byte signal Q (n-3), and the 4th electric current adjustment signal S4 produces through inverter K7 through the 3rd byte signal Q (n-3).Therefore, the 3rd and the 4th electric current adjust signal S3 and S4 each other phase difference 180 spend.The 5th electric current is adjusted signal S5 and is produced through inverter K9 and K10 by second byte signal Q (n-2), and the 6th electric current adjustment signal S6 is produced through inverter K9 by second byte signal Q (n-2).Therefore, the 5th and the 6th electric current adjust signal S5 and S6 each other phase difference 180 spend.The 7th electric current is adjusted signal S7 and is produced through inverter K11 and K12 by first byte signal Q (n-1), and the 8th electric current adjustment signal S8 is produced through inverter K11 by first byte signal Q (n-1).Therefore, the 7th and the 8th electric current adjust signal S7 and S8 each other phase difference 180 spend.
Current providing circuit 32 mainly has seven current source I
0To I
6Current source I
0Fixedly put on the charging transistor P of charging/discharging control circuit 33
Chg, as charging current I
ChgA part.Current source I
5The current mirror that is made of transistor N1 and N2 puts on the discharge transistor N of charging/discharging control circuit 33
Dis, thereby with current source I
6Fixing together as discharging current I
DisA part.Yet current source I
1To I
4Adjust the selection control of signal S1 to S8 and determine to put on charging transistor P based on first to the 8th electric current
ChgOr discharge transistor N
Dis
First electric current is adjusted the grid that signal S1 puts on PMOS transistor P1, and second electric current is adjusted the grid that signal S2 puts on PMOS transistor P2.When transistor P1 conducting, current source I
1As charging current I
ChgA part, and when transistor P2 conducting, current source I
1Then as discharging current I
DisA part.The 3rd electric current is adjusted the grid that signal S3 puts on PMOS transistor P3, and the 4th electric current is adjusted the grid that signal S4 puts on PMOS transistor P4.When transistor P3 conducting, current source I
2As charging current I
ChgA part, and when transistor P4 conducting, current source I
2Then as discharging current I
DisA part.The 5th electric current is adjusted the grid that signal S5 puts on PMOS transistor P5, and the 6th electric current is adjusted the grid that signal S6 puts on PMOS transistor P6.When transistor P5 conducting, current source I
3As charging current I
ChgA part, and when transistor P6 conducting, current source I
3Then as discharging current I
DisA part.The 7th electric current is adjusted the grid that signal S7 puts on PMOS transistor P7, and the 8th electric current is adjusted the grid that signal S8 puts on PMOS transistor P8.When transistor P7 conducting, current source I
4As charging current I
ChgA part, and when transistor P8 conducting, current source I
4Then as discharging current I
DisA part.
Describe in detail as follows now with reference to Fig. 3 and Fig. 4 according to the method for operation of initial voltage establishing circuit 18 of the present invention.In the embodiment shown in fig. 4, n byte counter CT uses seven byte counters, and it produces seven output signal Q0 to Q6, in order to represent seven ascending bytes.Output signal Q6 represents first byte, adjusts signal S7 and S8 in order to produce the 7th and the 8th electric current.Output signal Q5 represents second byte, adjusts signal S5 and S6 in order to produce the 5th and the 6th electric current.Output signal Q4 represents the 3rd byte, adjusts signal S3 and S4 in order to produce the 3rd and the 4th electric current.Output signal Q3 represents the 3rd byte, adjusts signal S1 and S2 in order to produce first and second electric current.
When initial voltage establishing circuit 18 began to operate, the removing end CLR of seven byte counter CT was triggered, and made the initial condition of seven output signal Q0 to Q6 all be set at high level H.Therefore, the first, the 3rd, the 5th and the 7th electric current is adjusted signal S1, S2, S5 and S7 and is all high level H, and the second, the 4th, the 6th and the 8th electric current adjustment signal S2, S4, S6 and S8 are all low level L.As a result, transistor P1, P3, P5 and not conductings of P7, and all conductings of transistor P2, P4, P6 and P8.In this case, charging current I
ChgEqual I
0, and discharging current I
DisEqual (I
1+ I
2+ I
3+ I
4+ I
5+ I
6).The electronegative potential L that initial voltage is set up signal ES makes charging transistor P
ChgConducting and allow charging current I
ChgPut on oscillating signal generating circuit 34, cause oscillating capacitance C
OscOn oscillating voltage V
OscContinue to raise.At oscillating voltage V
OscReach crest voltage V
pAnd trigger have the inverter K1 of hysteresis effect after, initial voltage is set up signal ES transition bit high potential H, makes discharge transistor N
DisConducting and allow oscillating signal generating circuit 34 by discharging current I
DisContinue to reduce oscillating capacitance C
OscOn oscillating voltage V
OscTherefore, at the time of Fig. 4 t
0To t
1In, D is compared in work
0Equal (I
0/ I
Total), I wherein
Total=(I
Chg+ I
Dis)=(I
0+ I
1+ I
2+ I
3+ I
4+ I
5+ I
6).
When seven byte counter CT receive initial voltage when setting up the 8th pulse of signal ES, output signal [Q3, Q4, Q5, Q6] promptly converts [L, H, H, H] to.The output signal Q3 that converts electronegative potential L from high potential H to causes transistor P1 conducting and not conducting of transistor P2.As a result, charging current I
ChgIncrease and be (I
0+ I
1), and discharging current I
DisBe reduced to (I
2+ I
3+ I
4+ I
5+ I
6).Therefore, at the time of Fig. 4 t
1To t
2In, D is compared in work
1Equal [(I
0+ I
1)/I
Total], it is with respect to the D of previous stage
0Increase slightly.
Subsequently, when seven byte counter CT receive initial voltage when setting up the 16th pulse of signal ES, output signal [Q3, Q4, Q5, Q6] promptly converts [H, L, H, H] to.The output signal Q4 that converts electronegative potential L from high potential H to causes transistor P3 conducting and not conducting of transistor P4.As a result, charging current I
ChgIncrease and be (I
0+ I
2), and discharging current I
DisBe reduced to (I
1+ I
3+ I
4+ I
5+ I
6).。Therefore, at the time of Fig. 4 t
2To t
3In, D is compared in work
2System equals [(I
0+ I
2)/I
Total], it is with respect to the D of previous stage
1Increase slightly.
Subsequently, when seven byte counter CT receive initial voltage when setting up the 24th pulse of signal ES, output signal [Q3, Q4, Q5, Q6] promptly converts [L, L, H, H] to.As a result, charging current I
ChgIncrease and be (I
0+ I
1+ I
2), and discharging current I
DisBe reduced to (I
3+ I
4+ I
5+ I
6).Therefore, at the time of Fig. 4 t
4To t
5In, D is compared in work
3Equal [(I
0+ I
1+ I
2)/I
Total], compared to the D of previous stage
2Increase slightly.
So continue to carry out charging current I according to aforesaid mode of operation
ChgIncrease gradually and discharging current I
DisReduce gradually, the work that causes being produced is than increasing gradually ...＜D
3＜D
4＜D
5＜D
6＜....At last, at the time of Fig. 4 t
15To t
16In, output signal [Q3, Q4, Q5, Q6] promptly is transformed into [L, L, L, L].As a result, charging current I
ChgIncrease and be (I
0+ I
1+ I
2+ I
3+ I
4), and discharging current I
DisBe reduced to (I
5+ I
6).Therefore, D is compared in work
15Equal [(I
0+ I
1+ I
2+ I
3+ I
4)/I
Total].
In the aforementioned embodiment, suppose current source I
0As the reference electric current, current source I then
1Be set at and equal current source I
0Current source I
2Be set at and equal current source I
0Two times; Current source I
3Be set at and equal current source I
0Four times; Current source I
4Be set at and equal current source I
0Octuple; Current source I
5Be set at and equal current source I
0Four times; And current source I
6Be set at and equal current source I
0Four times.Under this kind assumed condition, at time t
iTo t
(i+1)In the charging current I that produced
Chg (i)=(1+i) * I
0And discharging current I
Dis (i)=(23-i) * I
0, wherein i is 0 to 15 integer.Therefore, period T
ES (i)=C
Osc* V
p* [(1/I
Chg (i))+(1/I
Dis (i))], and formed work is than being D
i=I
Chg (i)/ (I
Chg (i)+ I
Dis (i))=(1+i)/24.
Therefore, initial voltage is set up signal ES originally a small work ratio is provided, and the work that is provided subsequently is than increasing gradually, makes the output voltage V of output O
OutRise to a predetermined initial output voltage gradually from zero potential.Because initial voltage is set up signal ES originally a small work ratio is provided, produce so prevent a large amount of inrush currents effectively.Because the output voltage V of output O
OutBe increased to this predetermined initial output voltage, therefore the work of the switch-over control signal CS that is exported from control switching circuit 11 is than not expanding to maximum.Therefore, prevent that effectively inrush current from causing circuit to damage.
Though the present invention is illustrated as example by most preferred embodiment, be appreciated that the embodiment that the invention is not restricted to disclose here.On the contrary, the present invention is intended to contain conspicuous to those skilled in the art various modifications and similar configuration.Therefore, the claimed scope of patent application should be according to the widest explanation, and this type of is revised and similar configuration to comprise all.
Claims (9)
1, a kind of initial voltage establishing circuit is used for a switch type electric voltage converter, and this switch type electric voltage converter is used for converting an input voltage to an output voltage, and this initial voltage establishing circuit comprises:
A current providing circuit is used to provide a charging current and a discharging current;
A matrix current adjustment circuit is used to adjust this charging current and this discharging current;
A charging/discharging control circuit is used for optionally allowing this charging current and this discharging current to pass through; And
An oscillating signal generating circuit, utilize this charging current and this discharging current to produce an initial voltage and set up signal, the work ratio that makes this initial voltage set up signal increases gradually, wherein thereby this initial voltage is set up the drive circuit that signal is applied in this switch type electric voltage converter and is set up an initial output voltage, and this work is than being the ratio of this charging current with this charging current and this discharging current sum.
2, initial voltage establishing circuit as claimed in claim 1, wherein:
This matrix current adjustment circuit is set up signal based on this initial voltage and is adjusted this charging current and this discharging current.
3, initial voltage establishing circuit as claimed in claim 1, wherein:
This matrix current adjustment circuit increases this charging current gradually and this discharging current is reduced gradually.
4, initial voltage establishing circuit as claimed in claim 1, wherein:
This oscillating signal generating circuit comprises:
An oscillating capacitance has been striden an oscillating voltage on it, when this charging current was charged to this oscillating capacitance, this oscillating voltage raise gradually, and when this oscillating capacitance discharged via this discharging current, this oscillating voltage reduced gradually, and
An inverter is used for producing this initial voltage in response to this oscillating voltage and sets up signal.
5, initial voltage establishing circuit as claimed in claim 1, wherein:
This matrix current adjustment circuit has a counter, is used to calculate the pulse number that this initial voltage is set up signal, so that this matrix current adjustment circuit is adjusted this charging current and this discharging current according to this pulse number.
6, a kind of switch type electric voltage converter is used for converting an input voltage to an output voltage, comprising:
A commutation circuit has one first switch, a second switch and an inductor, and wherein this first switch, this second switch and this inductor coupled in common are in a switching node;
An initial voltage establishing circuit comprises:
A current providing circuit is used to provide a charging current and a discharging current;
A matrix current adjustment circuit is used to adjust this charging current and this discharging current;
A charging/discharging control circuit is used for optionally allowing this charging current and this discharging current to pass through; And
An oscillating signal generating circuit, utilize this charging current and this discharging current to produce an initial voltage and set up signal, the work ratio that makes this initial voltage set up signal increases gradually, wherein thereby this initial voltage is set up the drive circuit that signal is applied in this switch type electric voltage converter and is set up an initial output voltage, and this work is than being the ratio of this charging current with this charging current and this discharging current sum;
A control switching circuit is used for producing a switch-over control signal in response to this output voltage; And
A signal selecting circuit, when this switch type electric voltage converter begins to start, this signal selecting circuit allows this initial voltage to set up signal and is applied to this commutation circuit to control this first switch and this second switch, make this output voltage rise to a predetermined initial voltage, and after this output voltage reaches this predetermined initial output voltage, this signal selecting circuit allows this switch-over control signal to be applied to this commutation circuit to control this first switch and this second switch, in order to regulate this output voltage in a predetermined target value.
7, switch type electric voltage converter as claimed in claim 6, wherein:
This matrix current adjustment circuit is set up signal based on this initial voltage and is adjusted this charging current and this discharging current, so that this charging current increases gradually and this discharging current is reduced gradually.
8, switch type electric voltage converter as claimed in claim 6, wherein:
This oscillating signal generating circuit comprises:
An oscillating capacitance has been striden an oscillating voltage on it, when this charging current was charged to this oscillating capacitance, this oscillating voltage raise gradually, and when this oscillating capacitance discharged via this discharging current, this oscillating voltage reduced gradually, and
An inverter is used for producing this initial voltage in response to this oscillating voltage and sets up signal.
9, switch type electric voltage converter as claimed in claim 6, wherein:
This matrix current adjustment circuit has a counter, is used to calculate the pulse number that this initial voltage is set up signal, so that this matrix current adjustment circuit is adjusted this charging current and this discharging current according to this pulse number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100941496A CN100468932C (en) | 2006-06-27 | 2006-06-27 | Initial voltage establishing circuit for switch type voltage converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100941496A CN100468932C (en) | 2006-06-27 | 2006-06-27 | Initial voltage establishing circuit for switch type voltage converter |
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| Publication Number | Publication Date |
|---|---|
| CN101098106A CN101098106A (en) | 2008-01-02 |
| CN100468932C true CN100468932C (en) | 2009-03-11 |
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|---|---|---|---|
| CNB2006100941496A Expired - Fee Related CN100468932C (en) | 2006-06-27 | 2006-06-27 | Initial voltage establishing circuit for switch type voltage converter |
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| Country | Link |
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