CN-224204995-U - Power module supporting wide voltage input and driving board card

CN224204995UCN 224204995 UCN224204995 UCN 224204995UCN-224204995-U

Abstract

The utility model relates to a power module supporting wide voltage input and a driving board card, and belongs to the field of driving of power electronic switching tubes. The power supply module comprises a control circuit and a flyback power supply, wherein the primary side of the flyback power supply is connected with a feedback resistor in series, the secondary side of the flyback power supply is used for driving a switching tube, the control circuit comprises a sampling loop, a third triode, a current source, a sampling resistor, a first comparison circuit and a logic driving circuit, the sampling loop is connected with the feedback resistor and the second triode, an emitter of the third triode is connected with the feedback resistor, the second triode and the third triode form a mirror constant current source circuit, a collector of the second triode is grounded through the current source, a collector of the third triode is grounded through the sampling resistor, an output end of the logic driving circuit is connected with a control end of the first switching tube, the logic driving circuit is connected with the sampling resistor, and the control circuit outputs PWM signals with different duty ratios according to the voltage at two ends of the sampling resistor. The circuit has simple structure and low cost.

Inventors

LV MIAO
MENG XIANGJUN
XU GUANCHENG
XIANG FUWEI
YANG XINRAN
LIANG CHAO

Assignees

西安许继电力电子技术有限公司
许继电气股份有限公司

Dates

Publication Date: 20260505
Application Date: 20250331

Claims (7)

1. A power supply module supporting wide voltage input comprises a flyback power supply for connecting wide input voltage, and is characterized in that the primary side of the flyback power supply is connected with a feedback resistor in series, and the secondary side of the flyback power supply is used for driving a switching tube; The power module further comprises a control circuit; The control circuit comprises a sampling loop, a second triode, a third triode, a current source, a sampling resistor, a first comparison circuit and a logic driving circuit; The input end of the sampling loop is connected with one end of the feedback resistor, and the output end of the sampling loop is connected with the emitter of the second triode; the collector of the second triode is grounded through a current source, and is also connected with the base electrode of the second triode; The collector electrode of the third triode is grounded through a sampling resistor; The output end of the logic driving circuit is connected with the control end of a first switching tube in the flyback power supply; The logic driving circuit is connected with the sampling resistor in a sampling way and is used for outputting a first PWM signal when the voltage at two ends of the sampling resistor is larger than a fixed voltage value; wherein the duty cycle of the first PWM signal is smaller than the duty cycle of the second PWM signal.
2. The power module supporting wide voltage input of claim 1, wherein the logic driving circuit comprises a first comparator, a logic circuit, and a PWM wave generator connected to a control terminal of the first switching tube; the sampling resistor is used for connecting one end of the collector electrode of the third triode as a signal point to be connected with one input end of the first comparison circuit, the other input end of the first comparison circuit is used for connecting a fixed voltage value, and the output end of the first comparison circuit is used for connecting the input end of the logic circuit; The output end of the logic circuit is connected with the PWM wave generator and is used for controlling the PWM wave generator to output a first PWM signal or a second PWM signal; The first comparison circuit is used for outputting a first signal when the voltage of the signal point is larger than the fixed voltage value; the logic circuit is used for generating a first logic signal according to the first signal and generating a second logic signal according to the second signal; The PWM wave generator is used for outputting a first PWM signal after receiving the first logic signal and outputting a second PWM signal after receiving the second logic signal.
3. The power module supporting wide voltage input of claim 1, wherein the control circuit further comprises a second comparator; One input end of the second comparator is used for being connected with a preset working voltage; The other input end of the second comparator is connected with one end of the sampling loop, which is used for connecting the second triode; the output end of the second comparator is used for being connected with a voltage protection logic module; The second comparator is used for outputting a third signal when the primary side voltage of the flyback power supply after passing through the sampling loop is larger than the preset working voltage, and outputting a fourth signal when the primary side voltage of the flyback power supply after passing through the sampling loop is smaller than the preset working voltage; The voltage protection logic module is used for starting the voltage protection logic when receiving the third signal and not starting the voltage protection logic when receiving the fourth signal.
4. The power module of claim 1, wherein the feedback resistor is a variable resistor.
5. The power module supporting wide voltage input of claim 1, further comprising an RC tank circuit and a fast recovery diode; The RC absorption loop and the fast recovery diode are connected in series and then connected in parallel at two ends of the primary side of the flyback power supply, and the conducting direction of the fast recovery diode points to the same-name end of the primary side of the flyback power supply.
6. The power module of any one of claims 1-5, wherein the secondary sides of the flyback power supply include two groups, each group of secondary sides driving a switching tube.
7. A driver board comprising the power module of any one of claims 1-6 supporting a wide voltage input.

Description

Power module supporting wide voltage input and driving board card Technical Field The utility model relates to a power module supporting wide voltage input and a driving board card, and belongs to the field of driving of power electronic switching tubes. Background With the acceleration of energy transformation and digital transformation, the industrial and commercial energy storage market is coming with a rapidly growing opportunity. Switching transistors such as Insulated Gate Bipolar Transistors (IGBTs) and silicon carbide metal-oxide semiconductor field effect transistors (MOSFETs) are used as core components in power electronics, and driving and protection technologies thereof have become the focus of current researches. The power devices such as IGBT and MOSFET have high working frequency and high-speed switching capability, a driving module is required to drive the switching tube, and along with continuous innovation of a driving scheme, the advantages and disadvantages of the driving module are directly related to the efficiency, reliability and safety of the system. As industrial and commercial energy storage products continue to be developed in series, the power supply voltages that can be provided to the drive modules by different products may not be uniform, for example, some power supply voltages are +5v, some +12v, some +15v, some +24v, etc. When the deviation between the voltage provided by the power supply and the driving voltage required by the switching tube is too large, the switching tube is burnt out, so that a circuit which can be compatible with the power supply voltage output by each power supply and convert the power supply voltage into the driving voltage required by the back-end switching tube is needed. The Chinese patent application publication No. CN119109328A discloses a voltage conversion circuit, an ammeter and a control method for wide input voltage. The first-stage power conversion circuit detects the voltage of an input bus, when the detection signal of the input bus is smaller than a set threshold voltage, the first-stage power conversion circuit drives, otherwise, the first-stage power conversion circuit stops driving, and the second-stage power conversion circuit receives the output voltage of the first-stage power conversion circuit to convert the output voltage into a desired output voltage, wherein the set threshold voltage is set according to the withstand voltage value of a power tube of the first-stage power conversion circuit. Through the technical scheme of the application, the voltage resistance of the main power switching tube of the first-stage power conversion circuit can be controlled, so that a switching tube with medium and low voltage resistance can be selected, the switching loss and the cost of the switching tube are greatly reduced, and the stress of a system is improved. Although this scheme can support a wide voltage input, converting the input voltage to the voltage required by the back-end load, it requires two stages of power conversion circuits, rendering the circuit complex and costly. Disclosure of utility model The utility model aims to provide a power module and a driving board card supporting wide voltage input, which are used for solving the problems of complex circuit and high cost in the prior art. In order to achieve the above object, the present utility model provides a method comprising: The utility model provides a power module supporting wide voltage input, which comprises a flyback power supply for connecting wide input voltage, wherein the primary side of the flyback power supply is connected with a feedback resistor in series, and the secondary side of the flyback power supply is used for driving a switching tube; the power supply module further comprises a control circuit; The control circuit comprises a sampling loop, a second triode, a third triode, a current source, a sampling resistor, a first comparison circuit and a logic driving circuit; The input end of the sampling loop is connected with one end of the feedback resistor, and the output end of the sampling loop is connected with the emitter of the second triode; The collector of the second triode is grounded through a current source; the collector electrode of the second triode is also connected with the base electrode of the second triode; The collector electrode of the third triode is grounded through a sampling resistor; The output end of the logic driving circuit is connected with the control end of a first switching tube in the flyback power supply; The logic driving circuit is connected with the sampling resistor in a sampling way and is used for outputting a first PWM signal when the voltage at two ends of the sampling resistor is larger than a fixed voltage value; wherein the duty cycle of the first PWM signal is smaller than the duty cycle of the second PWM signal. Further, the logic driving circuit comprises a first comparator, a logic circuit and a PWM wave g