CN215528617U - Control circuit for valley filling circuit - Google Patents
Control circuit for valley filling circuit Download PDFInfo
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- CN215528617U CN215528617U CN202121446776.8U CN202121446776U CN215528617U CN 215528617 U CN215528617 U CN 215528617U CN 202121446776 U CN202121446776 U CN 202121446776U CN 215528617 U CN215528617 U CN 215528617U
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Abstract
The utility model belongs to the technical field of electronic circuits, and discloses a control circuit for a valley filling circuit. In the low-voltage section, the control circuit can enable the switching tubes to be in a conducting state, so that the utilization rate of the energy storage element of the valley filling circuit is increased; in the high-voltage section, the control circuit can enable the switching tubes to be in a cut-off state, so that voltage spikes caused by switching of the switching tubes are eliminated. Meanwhile, when the input voltage is suddenly changed from low voltage to high voltage, the control circuit can also close all the switch tubes in time, so that the energy storage element in the valley filling circuit is effectively protected.
Description
Technical Field
The utility model belongs to the technical field of electronic circuits, and particularly relates to a control circuit for a valley filling circuit.
Background
With the continuous development of new energy technology industry, meeting the requirement of wider input voltage is an important development direction in the field of current switching power supplies. With the increasing range of input voltage, the requirement for the withstand voltage value of the filter capacitor at the previous stage is gradually increased. At present, the mode of capacitor series connection is adopted under the wide input working condition, but the mode not only reduces the integral capacitance value, but also increases the equivalent series resistance of the integral capacitor, so that the stable operation of the power supply under the low voltage is very unfavorable. In order to solve the above problem, a parallel capacitor is usually adopted, but this will increase the volume and cost of the power supply.
The valley filling circuit of the present invention is shown in FIG. 2, the waveform diagram for controlling the valley filling circuit by the conventional method is shown in FIG. 3, V in FIG. 3LNIs the signal waveform of the sampling terminal，Vgate1Is the driving waveform, V, of the switch tube VT1 in the conventional valley fill circuitgate2Is the driving waveform, V, of the switch tube VT2 in the conventional valley fill circuitABIs the voltage waveform across A, B in a conventional valley fill circuit. As shown in fig. 3, when the bus voltage (i.e. the voltage across A, B) is in the low-voltage stage, both the switching tubes VT1 and VT2 are in a constant-on state, and the capacitors are connected in parallel at this time, so that the capacitance value of the whole large capacitor is increased at the low voltage, thereby ensuring the stable operation of the power supply in the low-voltage stage. In order to reduce the volume and the cost of a power supply, the voltage withstanding values of capacitors CA1 and CA2 in the valley filling circuit are low, so when the bus voltage enters a high-voltage section, the conventional control method can turn on the switch tubes VT1 and VT2 when the bus voltage is zero, and turn off the switch tubes VT1 and VT2 when the bus voltage reaches a high-voltage threshold value, thereby effectively protecting energy storage elements in the circuit. However, when the bus voltage enters the high-voltage section from the low-voltage section, the capacitors are changed from parallel connection to series connection, and a voltage (voltage doubling spike) which is about twice as compared with that before switching is generated at two ends of the bus instantaneously, as shown in fig. 3, not only is EMI affected, but also transient stress of a rear-stage power device may be suddenly increased, so that the rear-stage power device may be damaged. Therefore, it is necessary to research a more effective control method to solve the above problems and further to popularize the practical application of the control circuit for a valley fill circuit according to the present invention.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: a control circuit for a valley filling circuit is provided, and the control circuit can effectively improve the stability and the safety of the valley filling circuit in both steady state and transient state of a power grid.
In order to solve the technical problems, the utility model provides the following technical scheme:
a control circuit for a valley filling circuit comprises a first switch tube and a second switch tube, wherein the first switch tube is connected with the ground in a non-floating manner, the second switch tube is connected with the ground in a floating manner, the control circuit comprises a detection module, a control module and a driving module,
one end of the detection module is connected with an alternating current input signal, the rectified input alternating current signal is subjected to peak value sampling and average value sampling respectively, and the peak value signal and the average value signal obtained by sampling are transmitted to the input end of the control module;
the control module compares the peak value signal obtained by sampling with a first preset voltage to obtain a peak value comparison voltage, compares the average value signal obtained by sampling with a second preset voltage to obtain an average value comparison voltage, and then passes the peak value comparison voltage and the average value comparison voltage through an AND gate to obtain an output signal and transmits the output signal to the driving module;
the driving module outputs a corresponding driving signal according to the output signal of the control module, and when the alternating current input signal is a low-voltage section signal, the driving module outputs the driving signal to control the first switching tube and the second switching tube in the valley filling circuit to be conducted simultaneously; when the alternating-current input signal is a high-voltage section signal, the driving module outputs a driving signal to control the first switching tube and the second switching tube in the valley filling circuit to be simultaneously cut off.
Preferably, the driving module is composed of an isolation driving unit, and the driving module controls the conduction or the cut-off of the second switching tube and the first switching tube in the valley filling circuit by passing an output signal of the control module through the isolation driving unit.
Furthermore, the driving module outputs a corresponding driving signal according to the output signal of the control module, and when the alternating current input signal is a low-voltage section signal, the driving signal output by the driving module is a constant high level; when the alternating current input signal is a high-voltage section signal, the driving signal output by the driving module is a constant low level; when the alternating current input signal is converted from a low-voltage section signal to a high-voltage section signal, the driving signal output by the driving module is converted from a high level to a low level; when the alternating current input signal is converted from a high-voltage section signal to a low-voltage section signal, the driving signal output by the driving module is converted from a low level to a high level.
Preferably, the detection module includes a first input port, a second input port, a first diode, a second diode, a first resistor, a second resistor, a fifth resistor, a sixth resistor, and a first capacitor; the anode of the first diode is connected with the first input port, the anode of the second diode is connected with the second input port, the cathode of the first diode is respectively connected with the cathode of the second diode and is grounded through the fifth resistor and the sixth resistor, the connection node of the fifth resistor and the sixth resistor is grounded through the first capacitor, and the second diode is grounded through the first resistor and the second resistor.
Preferably, the control module comprises a third resistor, a fourth resistor, a first operational amplifier, a third diode, a seventh resistor, an eighth resistor, a second operational amplifier, a fourth diode, a ninth resistor, a reference voltage regulator, a tenth resistor and a circuit power supply, wherein the third diode, the fourth diode and the tenth resistor form an and gate;
one end of a ninth resistor is connected with a circuit power supply, the other end of the ninth resistor is connected with the cathode of a reference voltage-stabilizing source, the cathode of the reference voltage-stabilizing source is connected with the reference pole of the reference voltage-stabilizing source, the anode of the reference voltage-stabilizing source is grounded, the inverting input end of a first operational amplifier is connected with the connecting node of a first resistor and a second resistor, the output end of the first operational amplifier is connected with the non-inverting input end of the first operational amplifier through a fourth resistor, the non-inverting input end of the first operational amplifier is connected with the reference pole of the reference voltage-stabilizing source through a third resistor, the output end of the first operational amplifier is connected with the cathode of a third diode, the inverting input end of a second operational amplifier is connected with the connecting node of a fifth resistor and a sixth resistor, the output end of the second operational amplifier is connected with the non-inverting input end of the second operational amplifier through an eighth resistor, the non-inverting input end of the second operational amplifier is connected with the reference pole of the reference voltage-stabilizing source through a seventh resistor, the output end of the second operational amplifier is connected with the cathode of a fourth diode, the anode of the fourth diode is connected with the anode of a third diode, one end of a tenth resistor is connected with a circuit power supply, and the other end of the tenth resistor is connected with the connection node of the third diode and the fourth diode; wherein the content of the first and second substances,
the inverting input end of the first operational amplifier inputs a peak signal, and the output end of the first operational amplifier outputs a peak comparison voltage; the inverting input end of the second operational amplifier inputs the average value signal, and the output end of the second operational amplifier outputs the average value comparison voltage.
Preferably, the driving module comprises an isolation driving unit, a first output port and a second output port;
the input end of the isolation driving unit is connected with a connection node of the third diode and the fourth diode; the output end of the isolation driving unit is used as the first output port and is connected with the second switch tube; one end of the second output port is connected with a connection node of the third diode and the fourth diode, and the other end of the second output port is connected with the first switch tube.
Preferably, the drive module comprises an isolated drive unit having an input, a first output port, and a second output port; the input end of the isolation driving unit is connected with a connection node of a third diode and a fourth diode; the first output port of the isolation driving unit is used for being connected with the first switch tube; and the second output port of the isolation driving unit is used for being connected with the second switch tube.
Furthermore, the first operational amplifier and the second operational amplifier are both powered by a separate circuit power supply, positive power supply ends of the first operational amplifier and the second operational amplifier are both connected with the circuit power supply, and negative power supply ends of the first operational amplifier and the second operational amplifier are both grounded.
Compared with the prior art, the utility model has the following beneficial effects:
1) the utility model provides a control circuit for a valley filling circuit, which can enable a first switching tube and a second switching tube in the valley filling circuit to be in a cut-off state when a high-voltage section works, so that a voltage doubling peak caused by switching of the first switching tube and the second switching tube in a steady state is eliminated;
2) the utility model provides a control circuit for a valley filling circuit, which can enable a first switch tube and a second switch tube in the valley filling circuit to be in a conducting state when the control circuit works in a low-voltage section, so that the utilization rate of an energy storage element of the valley filling circuit can be increased, and the stability of a power supply in low voltage can be improved.
Drawings
FIG. 1 is a schematic block diagram of a control circuit of the present invention;
FIG. 2 is a schematic diagram of the valley fill circuit of the present invention;
FIG. 3 is a waveform diagram illustrating a conventional method for controlling a valley fill circuit;
FIG. 4 is a schematic diagram of a first embodiment of a control circuit for a valley fill circuit of the present invention;
FIG. 5 is a schematic diagram of a second embodiment of a control circuit for a valley fill circuit of the present invention;
fig. 6 is a waveform diagram of the valley filling circuit of the present invention.
Detailed Description
In order to make the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
First embodiment
Referring to fig. 2 and 4, the present invention provides a control circuit for a valley filling circuit, the valley filling circuit includes a first switch transistor VT1 and a second switch transistor VT2, the first switch transistor VT1 is connected to ground in a non-floating manner, and the second switch transistor VT2 is connected to ground in a floating manner (refer to fig. 2); the control circuit comprises a detection module, a control module and a driving module.
One end of the detection module is connected with an alternating current input signal, the rectified input alternating current signal is respectively subjected to peak value sampling and average value sampling, and the peak value signal and the average value signal obtained by sampling are transmitted to the input end of the control module.
The detection module comprises a first input port L, a second input port N, a first diode D1, a second diode D2, a first resistor R1, a second resistor R2, a fifth resistor R5, a sixth resistor R6 and a first capacitor C1. The first input port L and the second input port N are respectively connected to an ac input signal.
An anode of the first diode D1 is connected to the first input port L, an anode of the second diode D2 is connected to the second input port N, a cathode of the first diode D1 is connected to a cathode of the second diode D2, and is grounded through a fifth resistor R5 and a sixth resistor R6, a connection node of the fifth resistor R5 and the sixth resistor R6 is grounded through a first capacitor C1, and the second diode D2 is grounded through a first resistor R1 and a second resistor R2, wherein a connection point of the first resistor R1 and the second resistor R2 outputs a peak signal; the connection node of the fifth resistor R5 and the sixth resistor R6 outputs an average value signal.
The control module compares the peak value signal obtained by sampling with a first preset voltage to obtain a peak value comparison voltage, compares the average value signal obtained by sampling with a second preset voltage to obtain an average value comparison voltage, and obtains an output signal through an AND gate between the peak value comparison voltage and the average value comparison voltage and transmits the output signal to the driving module.
The control module comprises a third resistor R3, a fourth resistor R4, a first operational amplifier U1A, a third diode D3, a seventh resistor R7, an eighth resistor R8, a second operational amplifier U2B, a fourth diode D4, a ninth resistor R9, a reference voltage regulator Z1, a tenth resistor R10 and a circuit power supply VCC. The third diode D3, the fourth diode D4, and the tenth resistor R10 form an and gate.
One end of a ninth resistor R9 is connected with a circuit power supply VCC, the other end of the ninth resistor R9 is connected with the cathode of a reference voltage regulator Z1, the cathode of the reference voltage regulator Z1 is connected with the reference pole of the reference voltage regulator Z1, the anode of the reference voltage regulator Z1 is grounded, the inverting input end of a first operational amplifier U1A is connected with the connecting node of the first resistor R1 and a second resistor R2, the output end of the first operational amplifier U1A is connected with the non-inverting input end of a first operational amplifier U1A through a fourth resistor R4, the non-inverting input end of the first operational amplifier U1A is connected with the reference pole of the reference voltage regulator Z1 through a third resistor R3, the output end of the first operational amplifier U1A is connected with the cathode of a third diode D3, the inverting input end of the second operational amplifier U2B is connected with the connecting node of a fifth resistor R5 and a sixth resistor R6, the output end of the second operational amplifier U2B is connected with the non-inverting input end of a second operational amplifier U2B through an eighth resistor R8, the non-inverting input end of the second operational amplifier U2B is connected with the reference pole of the reference voltage regulator Z1 through a seventh resistor R7, the output end of the second operational amplifier U2B is connected with the cathode of a fourth diode D4, and the anode of a fourth diode D4 is connected with the anode of a third diode D3.
A peak signal is input to an inverting input end of the first operational amplifier U1A, a first preset voltage is input to a non-inverting input end, and a peak comparison voltage is output to an output end; the inverting input terminal of the second operational amplifier U2B inputs the average value signal, the non-inverting input terminal inputs the second preset voltage, and the output terminal outputs the average value comparison voltage.
One end of the tenth resistor R10 is connected to the circuit power VCC, the other end of the tenth resistor R10 is connected to a connection node between the third diode D3 and the fourth diode D4, the first output port S1 is connected to a connection node between the third diode D3 and the fourth diode D4 via the isolation driving unit 101, and the second output port S2 is connected to a connection node between the third diode D3 and the fourth diode D4.
The driving module includes an isolation driving unit 101, a first output port S1, and a second output port S2, an input port of the isolation driving unit 101 is connected to a connection node of a third diode D3 and a fourth diode D4; an output port of the isolation driving unit 101 is connected to one end of the first output port S1, and the other end of the first output port S1 is connected to the second switching tube VT 2; one end of the second output port S2 is connected to a connection node between the third diode D3 and the fourth diode D4, and the other end of the second output port S2 is connected to the first switching transistor VT 1.
The driving module is used for outputting corresponding driving signals through the isolation driving unit according to the output signals of the control module to control the on/off of the first switching tube VT1 and the second switching tube VT 2. When the alternating current input is a low-voltage section signal, the driving signal output by the isolation driving unit is a constant high level; when the alternating current input is a high-voltage section signal, the driving signal output by the isolation driving unit is a constant low level; when the alternating current input is converted from a low-voltage section signal to a high-voltage section signal, the isolation driving unit converts a high level to a low level; when the alternating current input is converted from a high-voltage section signal to a low-voltage section signal, the isolation driving unit converts the low level to the high level.
For convenience of description, the first operational amplifier U1A is hereinafter referred to as the operational amplifier U1A, and the other components are the same, such as the first resistor R1 is referred to as the resistor R1.
The operating principle of the first embodiment of the control circuit for the valley filling circuit provided by the utility model is as follows:
fig. 6 is a waveform diagram of a first embodiment of a control circuit for a valley fill circuit according to the present invention, in which V in fig. 6LNIs the signal waveform of the sampling terminal, Vgate1For the driving waveform, V, of the switching tube VT1 in the valley-fill circuitgate2For the driving waveform, V, of the switching tube VT2 in the valley-fill circuitABIs the voltage waveform across A, B in the valley fill circuit. When the valley filling circuit works in a high-voltage section, the potential of the inverting input end of the operational amplifier U2B is higher than that of the non-inverting input end, so that a low level is output, the potential of one end of the resistor R10 connected with the diode D3 is pulled to be zero, and the switching tubes VT1 and VT2 in the valley filling circuit are controlled to be in a cut-off state.
When the valley filling circuit works in a low-voltage section, the potentials of the non-inverting input end of the operational amplifier U1A and the non-inverting input end of the operational amplifier U2B are higher than the potential of the inverting input end, so that the non-inverting input end and the inverting input end both output high levels, the diode D3 and the diode D4 are cut off, and the switching tubes VT1 and VT2 in the valley filling circuit are controlled to be in a conducting state.
When the input voltage of the valley filling circuit suddenly jumps from low voltage to high voltage, the potential of the inverting input end of the operational amplifier U1A is higher than that of the non-inverting input end, so that low level is output, the potential below the resistor R10 is quickly pulled to zero potential, and the switching tubes VT1 and VT2 in the valley filling circuit are closed in time.
When the input voltage of the valley filling circuit suddenly jumps from high voltage to low voltage, the potential of the non-inverting input end of the operational amplifier U1A is higher than that of the inverting input end, so that high level is output, the value of the capacitor C1 is very small, so that the potential of the non-inverting input end of the operational amplifier U2B is also higher than that of the inverting input end in a short time, so that high level is also output, at the moment, the diode D3 and the diode D4 are cut off, and the switching tubes VT1 and VT2 in the valley filling circuit are controlled to be in a conducting state.
Second embodiment
Fig. 5 shows a schematic diagram of a second embodiment of a control circuit for a valley filling circuit according to the present invention, where the circuit includes a first diode D1, a second diode D2, a first resistor R1, a second resistor R2, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a third resistor R3, a fourth resistor R4, a first operational amplifier U1A, a third diode D3, a seventh resistor R7, an eighth resistor R8, a second operational amplifier U2B, a fourth diode D4, a ninth resistor R9, a reference regulator Z1, a tenth resistor R10, an isolation driving unit 101, a first input port L, a second input port N, a first output port S1, a second output port S2, and a circuit power source VCC.
The second embodiment is similar to the first embodiment, except for the connection of the drive modules in the second embodiment. The driving module in the second embodiment includes an isolation driving unit 101, the isolation driving unit 101 having an input terminal, a first output port S1, and a second output port S2; the input end of the isolation driving unit 101 is connected with the connection node of the third diode D3 and the fourth diode D4; the first output port S1 of the isolation driving unit 101 is used for connecting with the first switching tube VT 1; the second output port S2 of the isolation driving unit 101 is used for connecting with the second switching tube VT 2.
The second embodiment is the same basic principle as the first embodiment.
Claims (8)
1. A control circuit for a valley filling circuit, the valley filling circuit comprising a first switching tube (VT1) and a second switching tube (VT2), the connection of the first switching tube (VT1) and the ground is a non-floating ground connection, the connection of the second switching tube (VT2) and the ground is a floating ground connection, the control circuit comprising a detection module, a control module and a driving module, characterized in that:
one end of the detection module is connected with an alternating current input signal, the rectified input alternating current signal is subjected to peak value sampling and average value sampling respectively, and the peak value signal and the average value signal obtained by sampling are transmitted to the input end of the control module;
the control module compares the peak value signal obtained by sampling with a first preset voltage to obtain a peak value comparison voltage, compares the average value signal obtained by sampling with a second preset voltage to obtain an average value comparison voltage, and then obtains an output signal by passing the peak value comparison voltage and the average value comparison voltage through an AND gate and transmits the output signal to the driving module;
the driving module outputs corresponding driving signals according to the output signals of the control module, and when the alternating current input signals are low-voltage section signals, the driving module outputs the driving signals to control a first switching tube (VT1) and a second switching tube (VT2) in the valley filling circuit to be conducted simultaneously; when the alternating current input signal is a high-voltage section signal, the driving module outputs a driving signal to control a first switching tube (VT1) and a second switching tube (VT2) in the valley filling circuit to be simultaneously cut off.
2. The control circuit of claim 1, wherein: the driving module comprises an isolation driving unit, and the driving module controls the conduction or the cut-off of a first switching tube (VT1) and a second switching tube (VT2) in the valley filling circuit by passing an output signal of the control module through the isolation driving unit.
3. The control circuit of claim 1, wherein: the driving module outputs a corresponding driving signal according to the output signal of the control module, and when the alternating current input signal is a low-voltage section signal, the driving signal output by the driving module is a constant high level; when the alternating current input signal is a high-voltage section signal, the driving signal output by the driving module is a constant low level; when the alternating current input signal is converted from a low-voltage section signal to a high-voltage section signal, the driving signal output by the driving module is converted from a high level to a low level; when the alternating current input signal is converted from a high-voltage section signal to a low-voltage section signal, the driving signal output by the driving module is converted from a low level to a high level.
4. The control circuit of claim 1, wherein: the detection module comprises a first input port (L), a second input port (N), a first diode (D1), a second diode (D2), a first resistor (R1), a second resistor (R2), a fifth resistor (R5), a sixth resistor (R6) and a first capacitor (C1);
the anode of the first diode (D1) is connected with the first input port (L), the anode of the second diode (D2) is connected with the second input port (N), the cathode of the first diode (D1) is respectively connected with the cathode of the second diode (D2) and is grounded through a fifth resistor (R5) and a sixth resistor (R6), the connection node of the fifth resistor (R5) and the sixth resistor (R6) is grounded through a first capacitor (C1), and the second diode (D2) is grounded through the first resistor (R1) and the second resistor (R2).
5. The control circuit of claim 1, wherein: the control module comprises a third resistor (R3), a fourth resistor (R4), a first operational amplifier (U1A), a third diode (D3), a seventh resistor (R7), an eighth resistor (R8), a second operational amplifier (U2B), a fourth diode (D4), a ninth resistor (R9), a reference voltage regulator (Z1), a tenth resistor (R10) and a circuit power supply (VCC), wherein the third diode (D3), the fourth diode (D4) and the tenth resistor (R10) form the AND gate;
one end of a ninth resistor (R9) is connected with a circuit power supply (VCC), the other end of the ninth resistor (R9) is connected with the cathode of a reference voltage-stabilizing source (Z1), the cathode of the reference voltage-stabilizing source (Z1) is connected with the reference pole of the reference voltage-stabilizing source (Z1), the anode of the reference voltage-stabilizing source (Z1) is grounded, the inverting input end of a first operational amplifier (U1A) is connected with the connecting node of a first resistor (R1) and a second resistor (R2), the output end of the first operational amplifier (U1A) is connected with the non-inverting input end of a first operational amplifier (U1A) through a fourth resistor (R4), the non-inverting input end of the first operational amplifier (U1A) is connected with the reference pole of the reference voltage-stabilizing source (Z1) through a third resistor (R3), the output end of the first operational amplifier (U1A) is connected with the cathode of a third diode (D3), the inverting input end of the second operational amplifier (U2) is connected with a sixth resistor (R5) and a sixth resistor 5, the output end of a second operational amplifier (U2B) is connected with the non-inverting input end of a second operational amplifier (U2B) through an eighth resistor (R8), the non-inverting input end of the second operational amplifier (U2B) is connected with the reference pole of a reference voltage regulator (Z1) through a seventh resistor (R7), the output end of the second operational amplifier (U2B) is connected with the cathode of a fourth diode (D4), the anode of the fourth diode (D4) is connected with the anode of a third diode (D3), one end of a tenth resistor (R10) is connected with a circuit power supply (VCC), and the other end of the tenth resistor (R10) is connected with the connection node of the third diode (D3) and the fourth diode (D4); wherein the content of the first and second substances,
the peak signal is input to the inverting input end of the first operational amplifier (U1A), and the peak comparison voltage is output from the output end of the first operational amplifier (U1A); the average value signal is input to the inverting input end of the second operational amplifier (U2B), and the average value comparison voltage is output to the output end of the second operational amplifier (U2B).
6. The control circuit of claim 1, wherein: the driving module includes an isolated driving unit (101), a first output port (S1), and a second output port (S2);
the input end of the isolation driving unit (101) is connected with the connection node of the third diode (D3) and the fourth diode (D4); an output end of the isolation driving unit (101) is used as the first output port (S1) and is connected with the second switch tube (VT 2); one end of the second output port (S2) is connected with the connection node of the third diode (D3) and the fourth diode (D4), and the other end of the second output port (S2) is connected with the first switch tube (VT 1).
7. The control circuit of claim 1, wherein: the drive module comprises an isolated drive unit (101), the isolated drive unit (101) having an input, a first output port (S1), and a second output port (S2); the input end of the isolation driving unit (101) is connected with the connection node of a third diode (D3) and a fourth diode (D4); a first output port (S1) of the isolation driving unit (101) is used for being connected with the first switch tube (VT 1); the second output port (S2) of the isolation driving unit (101) is used for being connected with the second switch tube (VT 2).
8. The control circuit of claim 5, wherein: the power supply circuit is characterized in that the first operational amplifier (U1A) and the second operational amplifier (U2B) are powered by an independent circuit power supply (VCC), the positive power supply ends of the first operational amplifier (U1A) and the second operational amplifier (U2B) are all connected with the circuit power supply (VCC), and the negative power supply ends of the first operational amplifier (U1A) and the second operational amplifier (U2B) are all grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121446776.8U CN215528617U (en) | 2021-06-29 | 2021-06-29 | Control circuit for valley filling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121446776.8U CN215528617U (en) | 2021-06-29 | 2021-06-29 | Control circuit for valley filling circuit |
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| Publication Number | Publication Date |
|---|---|
| CN215528617U true CN215528617U (en) | 2022-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121446776.8U Active CN215528617U (en) | 2021-06-29 | 2021-06-29 | Control circuit for valley filling circuit |
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| CN (1) | CN215528617U (en) |
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2021
- 2021-06-29 CN CN202121446776.8U patent/CN215528617U/en active Active
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