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CN-122026702-A - Driving circuit, voltage conversion circuit and energy storage power supply

CN122026702ACN 122026702 ACN122026702 ACN 122026702ACN-122026702-A

Abstract

The application relates to a driving circuit, a voltage conversion circuit and an energy storage power supply, wherein the driving circuit is used for driving the conversion circuit, the conversion circuit comprises a follow current pipe and a power pipe, the driving circuit comprises a switch module, a detection module, a switch control module and a switch control module, the first end of the switch module is connected with a grid electrode of the follow current pipe, the second end of the switch module is grounded, the input end of the detection module is connected with a driving signal output end of a driving chip, the detection module is used for outputting a first control signal when a driving signal output by the driving chip is represented as a disconnection driving signal of the follow current pipe, the input end of the switch control module is connected with an output end of the detection module, and the output end of the switch control module is connected with a control end of the switch module and is used for controlling the switch module to be conducted when the first control signal is received. And voltage spikes of the follow-up tube are avoided in the period of the x-stage, so that the circuit safety is protected.

Inventors

  • YOU YONGLIANG
  • DENG ZHIQIANG
  • HE YALING
  • Xiao Cunfa

Assignees

  • 深圳市德兰明海新能源股份有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (10)

  1. 1. A driving circuit for driving a conversion circuit, the conversion circuit comprising a continuous current tube and a power tube, the driving circuit comprising: The first end of the switch module is connected with the grid electrode of the freewheel tube, and the second end of the switch module is grounded; The input end of the detection module is connected with the driving signal output end of the driving chip, and the detection module is used for outputting a first control signal when the driving signal output by the driving chip is characterized as the disconnection driving signal of the continuous flow pipe; The input end of the switch control module is connected with the output end of the detection module, and the output end of the switch control module is connected with the control end of the switch module; the switch control module is used for controlling the switch module to be conducted when the first control signal is received.
  2. 2. The drive circuit of claim 1, wherein the detection module is further configured to output a second control signal when the drive signal output by the drive chip is characterized as a conductive drive signal of the continuous tube; the switch control module is also used for controlling the switch module to be disconnected when the second control signal is received.
  3. 3. The drive circuit of claim 1, wherein the detection module comprises: The anode of the unidirectional conduction unit is connected with the driving signal output end of the driving chip; The first input end of the detection unit is connected with the cathode of the unidirectional conduction unit, the second input end of the detection unit is connected with a power supply, and the output end of the detection unit is connected with the input end of the switch control module; The unidirectional conduction unit is turned off when the driving signal output by the driving chip is characterized as the disconnected driving signal of the continuous flow tube, the detection unit outputs a first control signal according to the power supply, the unidirectional conduction unit is turned on when the driving signal output by the driving chip is characterized as the conducted driving signal of the continuous flow tube, and the detection unit outputs a second control signal according to the power supply and the driving signal.
  4. 4. A driving circuit according to claim 3, wherein the detection unit comprises: the positive electrode of the voltage stabilizing tube is connected with the cathode of the unidirectional conduction unit; the emitting electrode of the fifth switching tube is connected to the power supply, and the collecting electrode of the fifth switching tube is used as the output of the detection unit; The emitter of the sixth switching tube is connected with the base electrode of the fifth switching tube, the collector of the sixth switching tube is grounded, and the base electrode of the sixth switching tube is connected with the negative electrode of the voltage stabilizing tube.
  5. 5. The driving circuit according to any one of claims 1 to 4, wherein the switch control module is configured to control the switch module to be turned on when the first control signal is received, and to control the switch module to be turned off when a timing time is reached.
  6. 6. The drive circuit of claim 5, wherein the switch control module comprises: The timing unit is used for controlling the switch module to be turned on under the condition that the detection module outputs a first control signal, and controlling the switch module to be turned off under the condition that the timing time of the timing unit reaches.
  7. 7. The driving circuit according to claim 6, wherein the timing unit includes a twentieth resistor and a third capacitor, a first end of the twentieth resistor is connected to the output terminal of the detection module, a second end of the twentieth resistor is connected to the first end of the third capacitor, and a second end of the third capacitor is connected to the control terminal of the switching module; the third capacitor is used for controlling the switch module to be turned on under the condition that the detection module outputs a first control signal, and the third capacitor stores energy, and controlling the switch module to be turned off under the condition that the energy storage time of the third capacitor reaches a timing time.
  8. 8. The drive circuit of claim 7, wherein the switch control module further comprises: and the two ends of the reset unit are respectively connected with the two ends of the third capacitor, and the reset unit is used for consuming the energy stored by the third capacitor under the condition that the detection module outputs a second control signal.
  9. 9. A voltage conversion circuit, characterized in that the voltage conversion circuit comprises: The conversion circuit comprises a continuous flow tube and a power tube; The driving chip is used for driving the conversion circuit; the driving circuit according to any one of claims 1 to 8, wherein an input terminal of the driving circuit is connected to a driving signal output terminal of the driving chip, and an output terminal of the driving circuit is connected to a gate of the freewheel tube.
  10. 10. An energy storage power supply comprising a voltage conversion circuit according to claim 9.

Description

Driving circuit, voltage conversion circuit and energy storage power supply Technical Field The present application relates to the field of electronic circuits, and in particular, to a driving circuit, a voltage conversion circuit, and an energy storage power supply. Background The voltage conversion circuit of the two switching tubes comprises two MOS tubes (a power tube Q1 and a freewheel tube Q2), an inductor L1 and an output capacitor. The power tube Q1 is used as a main switch tube to control energy to flow from input to inductance, and the freewheeling tube Q2 replaces a freewheeling diode in a traditional voltage conversion circuit and is called a synchronous rectifying tube. When the power tube Q1 is turned on, the current supplies power to the output capacitor and the load through the inductor, the inductor stores energy, and when the power tube Q1 is turned off, the current continues to flow to the load through the follow current tube Q2 (or the body diode of the follow current tube Q2) because the inductor current cannot be suddenly changed, and follow current is completed. In practical application, during the conduction process of the power tube Q1, the freewheeling tube Q2 emits a small voltage spike in the time axis x stage, so that the freewheeling tube Q2 is easy to conduct, thereby shorting the input voltage, and the MOS tube is damaged by sudden impact of large current. Disclosure of Invention Based on this, it is necessary to provide a driving circuit, a voltage conversion circuit, and an energy storage power supply. In a first aspect, the present application provides a driving circuit for driving a conversion circuit, the conversion circuit including a continuous current tube and a power tube, including: The first end of the switch module is connected with the grid electrode of the freewheel tube, and the second end of the switch module is grounded; The input end of the detection module is connected with the driving signal output end of the driving chip, and the detection module is used for outputting a first control signal when the driving signal output by the driving chip is characterized as the disconnection driving signal of the continuous flow pipe; The input end of the switch control module is connected with the output end of the detection module, and the output end of the switch control module is connected with the control end of the switch module; the switch control module is used for controlling the switch module to be conducted when the first control signal is received. In one embodiment, the detection module is further configured to output a second control signal when the driving signal output by the driving chip is characterized as a conductive driving signal of the continuous tube; the switch control module is also used for controlling the switch module to be disconnected when the second control signal is received. In one embodiment, the detection module includes: The anode of the unidirectional conduction unit is connected with the driving signal output end of the driving chip; The first input end of the detection unit is connected with the cathode of the unidirectional conduction unit, the second input end of the detection unit is connected with a power supply, and the output end of the detection unit is connected with the input end of the control switch module; The unidirectional conduction unit is turned off when the driving signal output by the driving chip is characterized as the disconnected driving signal of the continuous flow tube, the detection unit outputs a first control signal according to the power supply, the unidirectional conduction unit is turned on when the driving signal output by the driving chip is characterized as the conducted driving signal of the continuous flow tube, and the detection unit outputs a second control signal according to the power supply and the driving signal. In one embodiment, the detection unit includes: the positive electrode of the voltage stabilizing tube is connected with the cathode of the unidirectional conduction unit; the emitting electrode of the fifth switching tube is connected to the power supply, and the collecting electrode of the fifth switching tube is used as the output of the detection unit; The emitter of the sixth switching tube is connected with the base electrode of the fifth switching tube, the collector of the sixth switching tube is grounded, and the base electrode of the sixth switching tube is connected with the negative electrode of the voltage stabilizing tube. In one embodiment, the switch control module is used for controlling the switch module to be turned on when the first control signal is received, and controlling the switch module to be turned off when the timing time arrives. In one embodiment, the switch control module includes: The timing unit is used for controlling the switch module to be turned on under the condition that the detection module outputs a first control signal, and controlling