CN211267164U - PFC voltage boost segmented circuit and LED driving power supply - Google Patents
PFC voltage boost segmented circuit and LED driving power supply Download PDFInfo
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- CN211267164U CN211267164U CN201922484303.6U CN201922484303U CN211267164U CN 211267164 U CN211267164 U CN 211267164U CN 201922484303 U CN201922484303 U CN 201922484303U CN 211267164 U CN211267164 U CN 211267164U
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Abstract
The utility model relates to a PFC voltage boost segment circuit and LED drive power supply. According to the PFC voltage boost segmented circuit, the on-off of a first switch circuit is controlled by the ratio of the divided voltage of the first voltage dividing circuit to the reference voltage VREF, the on-off of a second switch circuit is controlled by the ratio of the divided voltage of the first voltage dividing circuit to the reference voltage VREF, the resistance ratio of the second voltage dividing circuit to a third voltage dividing circuit can be changed by the on-off of the first switch circuit and the second switch circuit, the voltage division of the second voltage dividing circuit and the third voltage dividing circuit to VBUS is further changed, and the VBUS voltage is adjusted by a control chip U1 according to the voltage division change. The utility model discloses change according to input voltage and adjust the resistance change, and then adjust VBUS voltage, be divided into the multistage with the PFC voltage of PFC circuit, effectively reduce the loss of device when input voltage is lower, improve overall efficiency.
Description
Technical Field
The utility model relates to a LED drive power supply field, more specifically say, relate to a PFC voltage boost segment circuit and LED drive power supply.
Background
At present, energy crisis and climate warming are prominent, so that people pay more and more attention to energy conversion efficiency and utilization efficiency. In many energy specifications, the efficiency index has higher requirements, and the overall efficiency requirement of the LED driving power supply is increased.
The output voltage of the PFC circuit in the current topology design of the BOOST power supply is designed to ensure that the output voltage of the PFC circuit is greater than the maximum input voltage and a higher fixed value is set when the maximum input voltage is reached. When the power supply is input at low voltage, the voltage difference between the output voltage and the input voltage of the PFC circuit is increased, so that great stress is generated on a device, the loss of the device is increased, the overall efficiency is lowered, the reliability of the power supply is reduced, and the service life of the power supply is influenced. Today, the requirement on energy efficiency is higher, so that the product cannot meet the requirement on energy efficiency.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a PFC voltage boost segment circuit and LED drive power supply.
The utility model provides a technical scheme that its technical problem adopted is: a PFC voltage boosting segmented circuit is constructed, and comprises a control chip U1, a first voltage division circuit, a second voltage division circuit, a third voltage division circuit, a first voltage division resistor, a first switch circuit, a second voltage division resistor and a second switch circuit;
an input end of the first voltage division circuit is connected with an input voltage VIN, a first output end of the first voltage division circuit is connected with a first input port of the first switch circuit, and a second output end of the first voltage division circuit is connected with a first input port of the second switch circuit; the grounding end of the first voltage division circuit is grounded;
a second input port of the first switch circuit is connected with a reference voltage VREF, and a second input port of the second switch circuit is connected with the reference voltage VREF; the third input end of the first switch circuit is connected with the second voltage division circuit through the first voltage division resistor, and the third input end of the second switch circuit is connected with the second voltage division circuit through the second voltage division resistor; the output end of the first switch circuit is grounded, and the output end of the second switch circuit is grounded;
the output end of the second voltage division circuit is grounded, the input end of the third voltage division circuit is connected with VBUS voltage, and the input end of the control chip U1 is connected with the connection point of the second voltage division circuit and the third voltage division circuit.
Further, in the PFC voltage boost segment circuit of the present invention, the first voltage-dividing circuit includes a resistor R1, a resistor R2, a resistor R3, and a resistor R4;
a first end of the resistor R1 is connected to the input voltage VIN, a second end of the resistor R1 is connected to a first end of the resistor R3 through the resistor R2, a second end of the resistor R3 is connected to a first end of the resistor R4, and a second end of the resistor R4 is grounded;
the connection point of the resistor R2 and the resistor R3 is a first output end of the first voltage division circuit; the connection point of the resistor R3 and the resistor R4 is a second output end of the first voltage division circuit; the second end of the resistor R4 is the ground terminal of the first voltage divider circuit.
Further, in the PFC voltage boost segmented circuit of the present invention, the second voltage dividing circuit is a resistor R16;
the first end of the resistor R16 is connected with the input end of the control chip U1 and the third voltage division circuit, and the second end of the resistor R16 is grounded.
Further, in the PFC voltage boost segmented circuit of the present invention, the third voltage division circuit includes a resistor R14, a resistor R15, and a resistor R17;
the first end of the resistor R16 is connected with the first end of the resistor R15, the second end of the resistor R15 is connected with the first end of the resistor R17 through the resistor R14, and the second end of the resistor R17 is connected with VBUS voltage.
Further, in the PFC voltage boost segment circuit of the present invention, the first switch circuit includes an amplifier U1-a, a transistor Q1, and a resistor R5;
the non-inverting input end of the amplifier U1-A is connected with the connection point of the resistor R2 and the resistor R3, the inverting input end of the amplifier U1-A is connected with a reference voltage VREF, and the output end of the amplifier U1-A is connected with the base of the triode Q1 through the resistor R5; the emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is connected with the connection point of the resistor R15 and the resistor R16 through the first divider resistor.
Further, in the PFC voltage boost segmented circuit of the present invention, the first voltage dividing resistor is a resistor R11;
the collector of the triode Q1 is connected with the connection point of the resistor R15 and the resistor R16 through the resistor R11.
Further, in the PFC voltage boost segment circuit of the present invention, the first switch circuit includes an amplifier U1-B, a transistor Q2, and a resistor R7;
the non-inverting input end of the amplifier U1-B is connected with the connection point of the resistor R3 and the resistor R4, the inverting input end of the amplifier U1-B is connected with a reference voltage VREF, and the output end of the amplifier U1-B is connected with the base of the triode Q2 through the resistor R7; the emitter of the transistor Q2 is grounded, and the collector of the transistor Q2 is connected with the connection point of the resistor R15 and the resistor R16 through the second divider resistor.
Further, in the PFC voltage boost segmented circuit of the present invention, the second voltage dividing resistor is a resistor R12;
the collector of the triode Q2 is connected with the connection point of the resistor R15 and the resistor R16 through the resistor R12.
Further, the PFC voltage boost segmented circuit of the present invention further comprises a plurality of groups of parallel voltage dividing circuits, each group of parallel voltage dividing circuits comprises an nth voltage dividing resistor and an nth switching circuit, wherein N is an integer greater than 2;
an nth output end of the first voltage division circuit is connected with a first input port of the nth switch circuit, a second input port of the nth switch circuit is connected with a reference voltage VREF, a third input end of the nth switch circuit is connected with the second voltage division circuit through the nth voltage division resistor, and an output end of the nth switch circuit is grounded.
In addition, the utility model also provides a LED drive power supply, include like foretell PFC voltage boost segment circuit.
Implement the utility model discloses a PFC voltage boost segment circuit and LED drive power supply have following beneficial effect: the utility model discloses change according to input voltage and adjust the resistance change, and then adjust VBUS voltage, be divided into the multistage with the PFC voltage of PFC circuit, effectively reduce the loss of device when input voltage is lower, improve overall efficiency.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural diagram of a PFC voltage boost segmented circuit according to an embodiment;
fig. 2 is a circuit diagram of a PFC voltage boost stage according to an embodiment;
fig. 3 is a schematic structural diagram of a PFC voltage boost section circuit according to an embodiment.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Examples
Referring to fig. 1, the PFC voltage boost segmented circuit of the present embodiment includes a control chip U1, and further includes a first voltage dividing circuit, a second voltage dividing circuit, a third voltage dividing circuit, a first voltage dividing resistor, a first switch circuit, a second voltage dividing resistor, and a second switch circuit.
The input end of the first voltage division circuit is connected with an input voltage VIN, the first output end of the first voltage division circuit is connected with the first input port of the first switch circuit, and the second output end of the first voltage division circuit is connected with the first input port of the second switch circuit; the ground terminal of the first voltage dividing circuit is grounded.
A second input port of the first switch circuit is connected with a reference voltage VREF, and a second input port of the second switch circuit is connected with the reference voltage VREF; the third input end of the first switching circuit is connected with the second voltage division circuit through a first voltage division resistor, and the third input end of the second switching circuit is connected with the second voltage division circuit through a second voltage division resistor; the output end of the first switch circuit is grounded, and the output end of the second switch circuit is grounded.
The output end of the second voltage division circuit is grounded, the input end of the third voltage division circuit is connected with VBUS voltage, and the input end of the control chip U1 is connected with the connection point of the second voltage division circuit and the third voltage division circuit.
The working principle of the PFC voltage boost segmented circuit of the present embodiment is as follows:
when the input voltage VIN is a low voltage, the VBUS voltage is a certain constant value, the voltage obtained by the first switching circuit from the first voltage division circuit is smaller than the reference voltage VREF, and the first switching circuit is turned off; the voltage obtained by the second switch circuit from the first voltage division circuit is less than the reference voltage VREF, and the second switch circuit is turned off.
When the input voltage VIN rises to the first preset value, the voltage obtained by the first switching circuit from the first voltage division circuit is greater than the reference voltage VREF, the first switching circuit is turned on, the first voltage division resistor and the second voltage division circuit are connected in parallel, the divided voltage after parallel connection is smaller than the divided voltage before parallel connection, the voltage received by the input end of the control chip U2 becomes smaller, and the control chip U2 controls the relevant battery to increase the VBUS voltage, for example, the output duty ratio is adjusted to increase the VBUS voltage.
When the input voltage VIN rises to a second preset value, the voltage obtained by the second switch circuit from the first voltage division circuit is greater than the reference voltage VREF, the second switch circuit is turned on, the first voltage division resistor, the second voltage division resistor and the second voltage division circuit are connected in parallel, the voltage division after the parallel connection is smaller than the voltage division before the parallel connection, the voltage received by the input end of the control chip U2 becomes smaller, and the control chip U2 controls the relevant battery to enable the VBUS voltage to continue to rise, for example, the output duty ratio is adjusted to enable the VBUS voltage to rise.
According to the embodiment, the resistance change is adjusted according to the input voltage change, so that the VBUS voltage is adjusted, the PFC voltage of the PFC circuit is divided into three sections, the loss of devices when the input voltage is low is effectively reduced, and the overall efficiency is improved.
Examples
Referring to fig. 2, on the basis of the previous embodiment, the first voltage dividing circuit in the PFC voltage boost segmented circuit of the present embodiment includes a resistor R1, a resistor R2, a resistor R3, and a resistor R4; a first end of the resistor R1 is connected with an input voltage VIN, a second end of the resistor R1 is connected with a first end of the resistor R3 through a resistor R2, a second end of the resistor R3 is connected with a first end of the resistor R4, and a second end of the resistor R4 is grounded; the connection point of the resistor R2 and the resistor R3 is a first output end of the first voltage division circuit; the connection point of the resistor R3 and the resistor R4 is the second output end of the first voltage division circuit; the second terminal of the resistor R4 is the ground terminal of the first voltage divider circuit.
The second voltage dividing circuit in the PFC voltage boost segmented circuit of the present embodiment is a resistor R16; the first end of the resistor R16 is connected with the input end of the control chip U1, and the second end of the resistor R16 is grounded.
The third voltage dividing circuit in the PFC voltage boost segmented circuit of the present embodiment includes a resistor R14, a resistor R15, and a resistor R17; the first end of the resistor R16 is connected with the first end of the resistor R15, the second end of the resistor R15 is connected with the first end of the resistor R17 through the resistor R14, and the second end of the resistor R17 is connected with VBUS voltage.
The first switch circuit in the PFC voltage boost segmented circuit of the present embodiment includes an amplifier U1-a, a transistor Q1, and a resistor R5; the non-inverting input end of the amplifier U1-A is connected with the connection point of the resistor R2 and the resistor R3, the inverting input end of the amplifier U1-A is connected with a reference voltage VREF, and the output end of the amplifier U1-A is connected with the base of the triode Q1 through the resistor R5; the emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is connected to the connection point of the resistor R15 and the resistor R16 through a first divider resistor.
In the PFC voltage boost segmented circuit of the present embodiment, the first voltage dividing resistor is a resistor R11; the collector of the transistor Q1 is connected to the connection point of the resistor R15 and the resistor R16 through the resistor R11.
The first switch circuit in the PFC voltage boost segmented circuit of the present embodiment includes an amplifier U1-B, a transistor Q2, and a resistor R7; the non-inverting input end of the amplifier U1-B is connected with the connection point of the resistor R3 and the resistor R4, the inverting input end of the amplifier U1-B is connected with a reference voltage VREF, and the output end of the amplifier U1-B is connected with the base of the triode Q2 through the resistor R7; the emitter of the transistor Q2 is grounded, and the collector of the transistor Q2 is connected to the connection point of the resistor R15 and the resistor R16 through a second voltage-dividing resistor.
In the PFC voltage boost segmented circuit of the present embodiment, the second voltage-dividing resistor is a resistor R12; the collector of the transistor Q2 is connected to the connection point of the resistor R15 and the resistor R16 through the resistor R12.
The working principle of the PFC voltage boost segmented circuit of the present embodiment is as follows:
when the input voltage VIN is low, the divided voltage obtained by the non-inverting input terminal of the amplifier U1-a from the connection point of the resistor R2 and the resistor R3 is less than the reference voltage VREF input by the inverting input terminal of the amplifier U1-a, and the output terminal of the amplifier U1-a outputs low level, so that the corresponding triode Q1 is cut off. The divided voltage obtained by the non-inverting input terminal of the amplifier U1-B from the connection point of the resistor R2 and the resistor R3 is less than the reference voltage VREF input by the inverting input terminal of the amplifier U1-B, and then the output terminal of the amplifier U1-B outputs low level, so that the corresponding triode Q2 is cut off.
When the input voltage VIN rises to a first preset value, a divided voltage obtained by the non-inverting input terminal of the amplifier U1-a from the connection point of the resistor R2 and the resistor R3 is greater than a reference voltage VREF input by the inverting input terminal of the amplifier U1-a, and then the output terminal of the amplifier U1-a outputs a high level, so that the corresponding triode Q1 is turned on. The resistor R11 and the resistor R16 are connected in parallel, and then connected in series with the resistor R14, the resistor R15 and the resistor R17 for voltage division, the voltage division after parallel connection is smaller than the voltage division before parallel connection, the voltage received by the input end of the control chip U2 becomes smaller, and the control chip U2 controls the relevant battery to enable the VBUS voltage to rise, for example, the output duty ratio is adjusted to enable the VBUS voltage to rise.
When the input voltage VIN rises to a second preset value, the divided voltage obtained by the non-inverting input terminal of the amplifier U1-B from the connection point of the resistor R3 and the resistor R4 is greater than the reference voltage VREF input by the inverting input terminal of the amplifier U1-B, and then the output terminal of the amplifier U1-B outputs a high level, so that the corresponding triode Q2 is turned on. The resistor R11, the resistor R12 and the resistor R16 are connected in parallel and then connected in series with the resistor R14, the resistor R15 and the resistor R17 for voltage division, the voltage division after parallel connection is smaller than the voltage division before parallel connection, the voltage received by the input end of the control chip U2 is reduced, and the control chip U2 controls the related battery to enable the VBUS voltage to continue to rise, for example, the output duty ratio is adjusted to enable the VBUS voltage to rise.
According to the embodiment, the resistance change is adjusted according to the input voltage change, so that the VBUS voltage is adjusted, the PFC voltage of the PFC circuit is divided into three sections, the loss of devices when the input voltage is low is effectively reduced, and the overall efficiency is improved.
Examples
Referring to fig. 3, on the basis of the above embodiment, the PFC voltage boost segmented circuit of this embodiment further includes a plurality of sets of parallel voltage dividing circuits, each set of parallel voltage dividing circuit includes an nth voltage dividing resistor and an nth switching circuit, where N is an integer greater than 2. The Nth output end of the first voltage division circuit is connected with the first input port of the Nth switch circuit, the second input port of the Nth switch circuit is connected with the reference voltage VREF, the third input end of the Nth switch circuit is connected with the second voltage division circuit through the Nth voltage division resistor, and the output end of the Nth switch circuit is grounded.
In this embodiment, a principle that N is 3 is used for illustration, and those skilled in the art can implement a plurality of groups of parallel voltage dividing circuits according to this embodiment, where the group of parallel voltage dividing circuits includes a third voltage dividing resistor and a third switching circuit. The working principle of the PFC voltage boost segmented circuit of the present embodiment is as follows:
when the input voltage VIN is a low voltage, the VBUS voltage is a certain constant value, the voltage obtained by the first switching circuit from the first voltage division circuit is smaller than the reference voltage VREF, and the first switching circuit is turned off; the voltage obtained by the second switch circuit from the first voltage division circuit is less than the reference voltage VREF, and the second switch circuit is turned off.
When the input voltage VIN rises to the first preset value, the voltage obtained by the first switching circuit from the first voltage division circuit is greater than the reference voltage VREF, the first switching circuit is turned on, the first voltage division resistor and the second voltage division circuit are connected in parallel, the divided voltage after parallel connection is smaller than the divided voltage before parallel connection, the voltage received by the input end of the control chip U2 becomes smaller, and the control chip U2 controls the relevant battery to increase the VBUS voltage, for example, the output duty ratio is adjusted to increase the VBUS voltage.
When the input voltage VIN rises to a second preset value, the voltage obtained by the second switch circuit from the first voltage division circuit is greater than the reference voltage VREF, the second switch circuit is turned on, the first voltage division resistor, the second voltage division resistor and the second voltage division circuit are connected in parallel, the voltage division after the parallel connection is smaller than the voltage division before the parallel connection, the voltage received by the input end of the control chip U2 becomes smaller, and the control chip U2 controls the relevant battery to enable the VBUS voltage to continue to rise, for example, the output duty ratio is adjusted to enable the VBUS voltage to rise.
When the input voltage VIN rises to a third preset value, the voltage obtained by the third switching circuit from the first voltage dividing circuit is greater than the reference voltage VREF, the third switching circuit is turned on, the first voltage dividing resistor, the second voltage dividing resistor, the third voltage dividing resistor and the second voltage dividing circuit are connected in parallel, the divided voltage after parallel connection is smaller than the divided voltage before parallel connection, the voltage received by the input end of the control chip U2 becomes smaller, and the control chip U2 controls the relevant battery to enable the VBUS voltage to continue to rise, for example, the output duty ratio is adjusted to enable the VBUS voltage to rise.
According to the embodiment, the resistance change is adjusted according to the input voltage change, so that the VBUS voltage is adjusted, the PFC voltage of the PFC circuit is divided into multiple sections, the loss of devices when the input voltage is low is effectively reduced, and the overall efficiency is improved.
Examples
The LED driving power supply of the present embodiment includes the PFC voltage boost section circuit as in the above-described embodiments.
According to the embodiment, the resistance change is adjusted according to the input voltage change, so that the VBUS voltage is adjusted, the PFC voltage of the PFC circuit is divided into multiple sections, the loss of devices when the input voltage is low is effectively reduced, and the overall efficiency is improved.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and implement the present invention accordingly, which can not limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.
Claims (10)
1. A PFC voltage boost segmented circuit comprises a control chip U1, and is characterized by further comprising a first voltage division circuit, a second voltage division circuit, a third voltage division circuit, a first voltage division resistor, a first switch circuit, a second voltage division resistor and a second switch circuit;
an input end of the first voltage division circuit is connected with an input voltage VIN, a first output end of the first voltage division circuit is connected with a first input port of the first switch circuit, and a second output end of the first voltage division circuit is connected with a first input port of the second switch circuit; the grounding end of the first voltage division circuit is grounded;
a second input port of the first switch circuit is connected with a reference voltage VREF, and a second input port of the second switch circuit is connected with the reference voltage VREF; the third input end of the first switch circuit is connected with the second voltage division circuit through the first voltage division resistor, and the third input end of the second switch circuit is connected with the second voltage division circuit through the second voltage division resistor; the output end of the first switch circuit is grounded, and the output end of the second switch circuit is grounded;
the output end of the second voltage division circuit is grounded, the input end of the third voltage division circuit is connected with VBUS voltage, and the input end of the control chip U1 is connected with the connection point of the second voltage division circuit and the third voltage division circuit.
2. The PFC voltage boost segmentation circuit of claim 1, wherein the first voltage division circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4;
a first end of the resistor R1 is connected to the input voltage VIN, a second end of the resistor R1 is connected to a first end of the resistor R3 through the resistor R2, a second end of the resistor R3 is connected to a first end of the resistor R4, and a second end of the resistor R4 is grounded;
the connection point of the resistor R2 and the resistor R3 is a first output end of the first voltage division circuit; the connection point of the resistor R3 and the resistor R4 is a second output end of the first voltage division circuit; the second end of the resistor R4 is the ground terminal of the first voltage divider circuit.
3. The PFC voltage boost segmentation circuit of claim 2, wherein the second voltage divider circuit is a resistor R16;
the first end of the resistor R16 is connected with the input end of the control chip U1 and the third voltage division circuit, and the second end of the resistor R16 is grounded.
4. The PFC voltage boost segmentation circuit of claim 3, wherein the third voltage division circuit comprises a resistor R14, a resistor R15, a resistor R17;
the first end of the resistor R16 is connected with the first end of the resistor R15, the second end of the resistor R15 is connected with the first end of the resistor R17 through the resistor R14, and the second end of the resistor R17 is connected with VBUS voltage.
5. The PFC voltage boost segmentation circuit of claim 4, wherein the first switching circuit comprises an amplifier U1-A, a transistor Q1, a resistor R5;
the non-inverting input end of the amplifier U1-A is connected with the connection point of the resistor R2 and the resistor R3, the inverting input end of the amplifier U1-A is connected with a reference voltage VREF, and the output end of the amplifier U1-A is connected with the base of the triode Q1 through the resistor R5; the emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is connected with the connection point of the resistor R15 and the resistor R16 through the first divider resistor.
6. The PFC voltage boost segment circuit of claim 5, wherein the first voltage-dividing resistor is a resistor R11;
the collector of the triode Q1 is connected with the connection point of the resistor R15 and the resistor R16 through the resistor R11.
7. The PFC voltage boost segmentation circuit of claim 6, wherein the first switching circuit comprises an amplifier U1-B, a transistor Q2, a resistor R7;
the non-inverting input end of the amplifier U1-B is connected with the connection point of the resistor R3 and the resistor R4, the inverting input end of the amplifier U1-B is connected with a reference voltage VREF, and the output end of the amplifier U1-B is connected with the base of the triode Q2 through the resistor R7; the emitter of the transistor Q2 is grounded, and the collector of the transistor Q2 is connected with the connection point of the resistor R15 and the resistor R16 through the second divider resistor.
8. The PFC voltage boost segmentation circuit of claim 7, wherein the second voltage-dividing resistor is a resistor R12;
the collector of the triode Q2 is connected with the connection point of the resistor R15 and the resistor R16 through the resistor R12.
9. The PFC voltage boost segmentation circuit of claim 1, further comprising a plurality of sets of parallel voltage divider circuits, each set of parallel voltage divider circuits comprising an nth voltage divider resistor and an nth switching circuit, wherein N is an integer greater than 2;
an nth output end of the first voltage division circuit is connected with a first input port of the nth switch circuit, a second input port of the nth switch circuit is connected with a reference voltage VREF, a third input end of the nth switch circuit is connected with the second voltage division circuit through the nth voltage division resistor, and an output end of the nth switch circuit is grounded.
10. An LED driving power supply comprising the PFC voltage boost section circuit according to any one of claims 1 to 9.
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| CN201922484303.6U CN211267164U (en) | 2019-12-30 | 2019-12-30 | PFC voltage boost segmented circuit and LED driving power supply |
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| CN201922484303.6U CN211267164U (en) | 2019-12-30 | 2019-12-30 | PFC voltage boost segmented circuit and LED driving power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113162404A (en) * | 2021-05-06 | 2021-07-23 | 上海广为焊接设备有限公司 | Control circuit and method of wide input voltage booster circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113162404A (en) * | 2021-05-06 | 2021-07-23 | 上海广为焊接设备有限公司 | Control circuit and method of wide input voltage booster circuit |
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