WO2016039502A1

WO2016039502A1 - Voltage sensing and control circuit

Info

Publication number: WO2016039502A1
Application number: PCT/KR2014/010045
Authority: WO
Inventors: 류홍제; 장성록; 김형석
Original assignee: 한국전기연구원
Priority date: 2014-09-11
Filing date: 2014-10-24
Publication date: 2016-03-17
Also published as: KR20160030660A; KR101768598B1

Abstract

Disclosed is a voltage sensing and control circuit connected to a power supply consisting of an inverter, a transformer, and rectification diodes, the voltage sensing and control circuit being characterized by comprising: a voltage measurement unit for transforming the first alternating voltage of a primary or secondary winding of the transformer into a second alternating voltage and then changing the second alternating voltage to a direct voltage; and an output voltage controller, which is connected to the voltage measurement unit, compares the direct voltage applied from the voltage measurement unit with a reference voltage, and controls the output of the inverter on the basis of the comparison result.

Description

Voltage sensing and control circuit

The present invention relates to a voltage sensing and control circuit, and more particularly, to a circuit for controlling the output voltage of an inverter in a power supply consisting of an inverter, a transformer and a rectifier diode.

In general, high voltage power supplies are used for the operation of devices (loads) that require high voltage, such as test equipment such as vacuum devices such as Gyrotron or plasma generators. As a method for determining whether an inverter output voltage is abnormal during operation of the high voltage power supply device, conventionally, an AC voltage output from a secondary winding voltage of a transformer of a high voltage power supply device is changed to a DC voltage using a rectifier diode, By comparing the DC voltage applied to each capacitor with the reference voltage, a control circuit for outputting a control signal for increasing the output voltage of the inverter when the magnitude of the DC voltage is lower than the reference voltage is configured.

However, according to this technique, the highest voltage is output to the capacitor located at the top of the high voltage power supply, and the minimum voltage is output to the capacitor located at the bottom, so that the voltage sensing and control circuit is connected to the top capacitor. In this case, a high voltage is applied to the voltage sensing and control circuit, and there is a risk that the device is destroyed.

In addition, due to such a risk, in the pulse power supply, when the polarity of the pulse is to be changed, the position of the voltage sensing and control circuit located together with the grounding arrangement of the corresponding circuit must be changed. In this case, there is a problem in that the polarity of the pulse cannot be easily changed due to the risk of breaking the control circuit.

The voltage sensing and control circuit in the power supply apparatus according to an embodiment of the present invention aims to prevent a high voltage from being applied to the voltage sensing and control circuit and to configure the voltage sensing and control circuit without a position limitation.

In addition, the voltage sensing and control circuit in the power supply apparatus according to an embodiment of the present invention, an object of the pulse power supply to easily change the polarity of the pulse without the risk of voltage sensing and control circuit element destruction.

Voltage sensing and control circuit connected to a power supply device consisting of an inverter, a transformer and a rectifying diode according to an embodiment of the present invention

In the voltage sensing and control circuit connected to a power supply device consisting of an inverter, a transformer and a rectifying diode, after converting the first AC voltage of the primary winding or the secondary winding of the transformer into a second AC voltage, A voltage measuring unit for changing an AC voltage into a DC voltage; And an output voltage controller connected to the voltage measuring unit to compare the DC voltage applied from the voltage measuring unit with a reference voltage, and to control the output of the inverter based on the comparison result.

The voltage measuring unit is connected to the primary winding or the secondary winding, the sensor transformer for transforming the first AC voltage into the second AC voltage; And a rectifier for changing the second AC voltage to the DC voltage.

The voltage measuring unit may include an amplifier amplifying the DC voltage applied from the rectifier and applying the amplified voltage to the output voltage controller.

The amplifier may be a differential amplifier for differentially amplifying the DC voltage applied from the rectifier and applying the differential voltage to the output voltage controller.

The voltage measuring unit may further include a voltage sensing element configured to sense a DC voltage output from the rectifier.

The sensor transformer may be an isolation transformer.

The voltage sensing element may be composed of a resistor and a capacitor.

The output voltage controller may output a control signal for increasing the output of the inverter when the output voltage is smaller than the reference voltage by comparing the output voltage obtained through the voltage measuring unit with the reference voltage.

The output voltage controller may output a control signal for reducing the output of the inverter when the output voltage is greater than the reference voltage by comparing the output voltage obtained through the voltage measuring unit with the reference voltage.

The power supply device may be a pulsed power supply device that outputs a pulse signal to a load by connecting a semiconductor switch to an output terminal circuit.

The power supply may be a power supply including a circuit for applying a voltage with the output separated from ground.

The voltage sensing and control circuit may include a second sensor transformer connected to a first AC voltage terminal of the transformer to convert the first AC voltage into a third AC voltage; A second rectifier for converting the transformed third AC voltage into a second DC voltage; And a comparator configured to control the output of the inverter by comparing the changed second DC voltage with a second reference voltage.

The comparator may output a control signal to stop the inverter when a difference between the changed second DC voltage and the second reference voltage is greater than or equal to a predetermined range.

The voltage sensing and control circuit in the power supply apparatus according to the embodiment of the present invention may prevent high voltage from being applied to the voltage sensing and control circuit, and may configure the voltage sensing and control circuit without a position limitation.

In addition, the voltage sensing and control circuit in the power supply apparatus according to an embodiment of the present invention can easily change the polarity of the pulse without the risk of breaking the voltage sensing and control circuit elements in the pulse power supply.

1 is a configuration diagram showing a voltage sensing and control circuit in a conventional high voltage power supply device.

2 is a circuit diagram illustrating a voltage sensing and control circuit in a power supply apparatus according to an embodiment of the present invention.

3 is a block diagram illustrating a voltage sensing and control circuit in a power supply apparatus according to an embodiment of the present invention.

4 is a block diagram illustrating a voltage sensing and control circuit in a pulse power supply according to an embodiment of the present invention.

FIG. 5 is a diagram illustrating a voltage sensing and control circuit in a heater power supply (HPS) of a vacuum equipment according to an embodiment of the present invention.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims.

The present invention can be applied to a general power supply device, in particular, a high voltage power supply device that is a high voltage power supply device, a HPS (Heater Power System) of a vacuum equipment, and the like, and relates to a circuit for controlling an inverter output of a corresponding device.

As shown in FIG. 1, a conventional power supply voltage sensing and control circuit has a voltage divider 50 when the output of the inverter 10 is applied to the capacitor 40 via the respective transformer 20 and the rectifier 30. obtains the voltage sensing element 60, the voltage applied to the capacitor 40 through a differential amplifier 70 and the like, or values V _real amplified him to scale, and compared with the reference voltage V _ref, V _real this If less than V _ref , a control signal for increasing the output of the inverter 10 is output.

In the prior art as described above, the voltage of the maximum value is output to the capacitor 40 located at the top of the power supply, and the voltage of the minimum value is output to the capacitor 40 located at the bottom thereof. When connected to the uppermost capacitor 40, a high voltage is applied to the voltage sensing and control circuit there is a risk that the device is destroyed.

Therefore, in the present invention, in order to solve the above problems, a method of measuring the voltage value by connecting the primary winding 21 or the secondary winding 22 of the transformer 20 of the power supply unit and the sensor transformer 310 in parallel The configuration and operation of the present invention will be described in detail below.

2 is a block diagram illustrating a configuration of a voltage sensing and control circuit according to an embodiment of the present invention. As shown in FIG. 2, the voltage sensing and control circuit 200 according to the exemplary embodiment of the present invention may include a voltage measuring unit 300 and an output voltage control unit 400.

The voltage measuring unit 300 obtains V _real through a connection with the primary winding 21 or the secondary winding 22 of the transformer 20 in the power supply device, transfers it to the output voltage controller 400, and outputs the output voltage. The controller 400 compares the received V _real with a reference voltage V _ref and controls the inverter output according to the result.

Specifically, as shown in FIG. 2, the voltage measuring unit 300 includes a sensor transformer 310 and a rectifier 320 connected in parallel with the primary winding 21 or the secondary winding 22 of the transformer 20. The voltage sensing device 60 and the differential amplifier 70 may be configured.

The first alternating voltage of the corresponding winding side connected by the sensor transformer 310 connected in parallel with the primary winding 21 or the secondary winding 22 is transformed into a second alternating voltage in proportion to the number of turns of the sensor transformer 310. The second AC voltage is changed into a DC voltage through the rectifier 320.

The high voltage applied to the primary side winding 21 or the secondary side winding 22 of the transformer 20 may be reduced through the AC voltage conversion process through the sensor transformer 310, and the DC voltage through the rectifier 320 may be reduced. By changing, we can get V _real more stably and compare it with V _ref .

The DC voltage thus changed may be directly input to the output voltage controller 400 as V _real, and may be changed to a value through the voltage sensing device 60, the differential amplifier 70, or the like, and input to the output voltage controller 400. May be

When the differential amplifier 70 is connected, the DC voltage is amplified by the differential amplifier 70 at a predetermined ratio and then input to V _real in the output voltage controller 400.

Alternatively, when the voltage sensing device 60 and the differential amplifier 70 are connected together, the DC voltage is amplified by a predetermined ratio through the voltage sensing device 60 and the differential amplifier 70 and is then V to the output voltage controller 400. _It is entered as _real .

The output voltage controller 400 compares V _ref with a magnitude of V _real based on the input V _real , and outputs a control signal for increasing the output of the inverter 10 when V _real is smaller than V _ref . When V _real is greater than V _ref , a control signal for reducing the output of the inverter 10 is output.

V _ref may be set to a predetermined value by the user according to the configuration of the voltage sensing and control circuit 200.

2, the sensor transformer 310, the rectifier 320, the voltage sensing element 60, and the differential amplifier 70 connected in parallel with the secondary winding 22 of the transformer 20 as the voltage sensing and control circuit 200. ) And the output voltage control unit 400, but the voltage sensing element 60 and the differential amplifier 70 correspond to additional components added to accurately obtain a V _real value.

In addition, the differential amplifier may be replaced by another type of amplifier.

The differential amplifier has an output when one end of the secondary winding of the sensor transformer 310 is positive voltage and an output when the other end of the secondary winding of the sensor transformer is positive voltage passes through the rectifier to provide a positive terminal of the amplifier. And a V _real value obtained by differentially amplifying each of the input DC voltages when respectively input to the terminals.

The sensor transformer 310 may be composed of an isolation transformer, and the voltage sensing element 60 may be composed of a resistor and a capacitor.

As shown in FIG. 3, the voltage sensing and control circuit 200 according to an embodiment of the present invention may be used in a general power supply device.

In detail, the power supply device receives a voltage by the DC / AC inverter, and transforms it through each transformer 20. The alternating voltage transformed in proportion to the number of turns of the transformer 20 is changed to a direct current voltage through the rectifier 30. The alternating direct current voltage is applied to each capacitor 40 and applies a voltage to the load.

In this power supply, the voltage sensing and control circuit 200 is connected to the primary winding 21 or the secondary winding 22 of the transformer 20, the sensor transformer 310, the rectifier 320, An output voltage controller configured to control the inverter output by comparing the voltage _realization unit 300 and the reference voltage V _ref obtained through the voltage measuring unit 300 and the voltage measuring unit 300 including the voltage sensing element 60 and the differential amplifier 70. 400).

Specifically, the sensor transformer 310 receives an AC voltage of the primary winding 21 or the secondary winding 22 of the connected transformer 20, which is proportional to the number of turns of the sensor transformer 310. Transform to AC voltage. The rectifier 320 may change the second AC voltage into a DC voltage, input the same to the differential amplifier 70 through the voltage sensing device 60, and input the V _real value to the output voltage controller 400.

The output voltage controller 400 may compare the input V _real value with the set V _ref value and output an inverter output control signal corresponding thereto.

That is, the output voltage control section 400 is based on the V _real received this input, when compared to the V _ref V _real is less than V _ref, to output a control signal for increasing the output of the inverter 10, and When V _real is greater than V _ref , a control signal for reducing the output of the inverter 10 may be output.

As shown in FIG. 4, the voltage sensing and control circuit according to the exemplary embodiment of the present invention is also used in a pulse power supply device, and a high voltage is applied to the voltage sensing and control circuit according to the related art, and thus, the device may be destroyed. This risk can solve the problem that the polarity of the pulse can not be easily changed.

Specifically, as shown in Figure 4, the voltage sensing and control circuit 200 in the pulsed power supply apparatus according to an embodiment of the present invention, the primary winding 21 of the transformer 20 or By using the sensor transformer 310, the rectifier 320, the voltage sensing element 60, the amplifier 330 or the differential amplifier 70 connected to the secondary winding 22, the primary winding of the transformer 20 ( 21) or V _real is obtained based on the voltage applied to the secondary winding 22, and is transferred to the output voltage controller 400 so that the output voltage controller 400 compares the received V _real with V _ref and corresponds thereto. Inverter control signal can be output.

In addition, the voltage sensing and control circuit 200 according to an embodiment of the present invention may be applied to a power supply device that applies a voltage in a state in which the output is separated from the ground. For example, as shown in FIG. 5, the apparatus may also be used in a device for a heat power supply (HPS) 120 in a general vacuum equipment.

Specifically, as shown in FIG. 5, the voltage sensing and control circuit in the HPS device 120 in the distribution equipment is configured as described above with the primary winding 21 or the secondary winding 22 of the transformer 20 in the device. The primary winding 21 or the secondary side of the transformer 20 using the sensor transformer 310, rectifier 320, voltage sensing device 60, amplifier 330 or differential amplifier 70 connected to the Based on the voltage applied to the winding 22, V _real is obtained as described above, and transferred to the output voltage controller 400, the output voltage controller 400 compares the received V _real with V _ref to correspond to the inverter control signal corresponding thereto. You can output

In addition, the voltage sensing and control circuit 200 may be connected to a first AC voltage terminal of the transformer 20 in addition to the above configuration to convert the first AC voltage into a third AC voltage 410. A second rectifier 420 for changing the transformed third AC voltage to a second DC voltage and a comparator 450 for controlling the output of the inverter by comparing the changed second DC voltage with a second reference voltage; It can be configured as.

The second sensor transformer 410 may be connected to the primary winding of the sensor transformer 310 to receive a first AC voltage.

The comparator 450 may stop the operation of the inverter 10 by outputting a control signal to the inverter 10 to stop the inverter when the difference between the changed DC voltage and the reference voltage is greater than or equal to a predetermined range set by the user. .

3 to 5, the winding of the transformer 20 constituting the power supply device to which the sensor transformer 310 of the voltage measuring unit 300 is connected may be one of the primary winding 21 and the secondary winding 22. Although it is specified, this is according to an embodiment of the present invention, in the present invention, the sensor transformer 310 of the voltage measuring unit 300 is the primary side winding 21 or the secondary side winding ( It can be connected to any of the windings 22).

3 to 5, the voltage sensing and control circuit 200 is connected to the transformer located at the bottom of the power supply, but this is an embodiment of the present invention, and the voltage sensing and control circuit 200 Can also be connected to a transformer located anywhere on the top, stop, or bottom of the power supply.

Although the embodiments of the present invention have been described with reference to the accompanying drawings as described above, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing its technical spirit or essential features. You will understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

Claims

In a voltage sensing and control circuit connected to a power supply consisting of an inverter, a transformer and a rectifying diode,

A voltage measuring unit converting the first AC voltage of the primary winding or the secondary winding of the transformer into a second AC voltage, and then changing the second AC voltage to a DC voltage; And

A voltage sensing unit connected to the voltage measuring unit and comparing the DC voltage applied from the voltage measuring unit with a reference voltage and controlling an output of the inverter based on the comparison result; Control circuit.
The method of claim 1,

The voltage measuring unit

A sensor transformer connected to the primary winding or the secondary winding to transform the first AC voltage into the second AC voltage; And

And a rectifier for changing the second AC voltage to the DC voltage.
The method of claim 2,

The voltage measuring unit,

And an amplifier for amplifying the DC voltage applied from the rectifier and applying the DC voltage to the output voltage controller.
The method of claim 3, wherein

The amplifier

And a differential amplifier for differentially amplifying the DC voltage applied from the rectifier and applying the differential voltage to the output voltage controller.
The method of claim 2,

The voltage measuring unit

The voltage sensing and control circuit further comprises a voltage sensing element for sensing the DC voltage output from the rectifier.
The method of claim 2,

The sensor transformer is an isolation transformer.
The method of claim 5,

The voltage sensing device is a voltage sensing and control circuit, characterized in that consisting of a resistor and a capacitor.
The method of claim 1,

The output voltage control unit

And a control signal for increasing the output of the inverter when the output voltage is smaller than the reference voltage by comparing the output voltage obtained through the voltage measuring unit with the reference voltage.
The method of claim 1,

The output voltage control unit

And a control signal for reducing the output of the inverter when the output voltage is greater than the reference voltage by comparing the output voltage obtained through the voltage measuring unit with the reference voltage.
The method of claim 1,

The power supply device is a voltage sensing and control circuit, characterized in that the pulsed power supply for outputting a pulse signal to the load is a semiconductor switch is connected to the output terminal circuit.
The method of claim 1,

And the power supply device is a power supply device for applying a voltage when the output is separated from the ground.
The method of claim 11,

The voltage sensing and control circuit

A second sensor transformer connected to a first AC voltage terminal of the transformer to convert the first AC voltage into a third AC voltage;

A second rectifier for converting the transformed third AC voltage into a second DC voltage; And

And a comparator for controlling the output of the inverter by comparing the changed second DC voltage with a second reference voltage.
The method of claim 12,

And the comparator outputs a control signal to stop the inverter when a difference between the changed second DC voltage and the second reference voltage is greater than or equal to a predetermined range.