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Voltage reduction power supply circuit structure and voltage reduction power supply

A step-down power supply and circuit structure technology, which is applied in the direction of high-efficiency power electronic conversion, electrical components, and adjustment of electrical variables, etc. It can solve the problem that the upper bridge arm switch tube cannot be set to 100% duty cycle, and the bootstrap capacitor cannot be bootstrapped and charged. problems, to achieve the effect of reducing the pressure drop

Pending Publication Date: 2022-07-12
SHENZHEN TOPBAND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a step-down power supply circuit structure, aiming to solve the problem that when the input voltage of the step-down power supply in the prior art is lower than the set output voltage, the bootstrap capacitor cannot be bootstrapped and charged, resulting in the switch tube of the upper bridge arm being unable to be set to 100%. empty ratio problem

Method used

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  • Voltage reduction power supply circuit structure and voltage reduction power supply
  • Voltage reduction power supply circuit structure and voltage reduction power supply
  • Voltage reduction power supply circuit structure and voltage reduction power supply

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Embodiment 1

[0044] In some alternative embodiments, such as Figure 2 to Figure 3 As shown, the present application provides a step-down power supply circuit structure, including a step-down output circuit 100 , an output driving circuit 200 , a main control circuit 300 and a step-up output circuit 400 . The step-down output circuit 100 is connected to the circuit input terminal Vin, and the step-down output circuit 100 is used to receive the voltage signal of the circuit input terminal Vin and output the first voltage signal after the step-down; the output drive circuit 200 and the step-down output circuit 100 The output terminal of the circuit 300 is connected to the circuit input terminal Vin, and receives the first voltage signal to charge the bootstrap capacitor C1 of the upper-arm switch tube Q1; the main control circuit 300 is connected to the circuit input terminal Vin, receives the voltage signal of the current input terminal Vin, and When the voltage signal of the circuit input ...

Embodiment 2

[0050] Optionally, the step-down output circuit 100 includes a step-down power supply unit 110, a first resistor R1 and a first diode D1;

[0051] The input terminal of the step-down power supply unit 110 is connected to the circuit input terminal Vin, and the output terminal of the step-down power supply unit 110 is connected to one end of the first resistor R1;

[0052] The other end of the first resistor R1 is connected to the anode of the first diode D1 , and the cathode of the first diode D1 is connected to the output driving circuit 200 .

[0053] Optionally, the output driving circuit 200 includes a driving chip U1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a bootstrap capacitor C1, a lower-arm switch Q2 and a lower-arm switch. Q1;

[0054] The driver chip U1 includes a chip voltage pin VCC, a first input pin HIN, a second input pin LIN, a first control pin VB, a second control pin VS, a first output pin HO, and a second outp...

Embodiment 3

[0088]In some optional embodiments, the present application further provides an electrical device, including the above-mentioned step-down power supply circuit structure.

[0089] During implementation, the structure of the step-down power supply circuit of the electrical equipment includes a step-down output circuit 100 , an output driving circuit 200 , a main control circuit 300 and a booster output circuit 400 . The step-down output circuit 100 is connected to the circuit input terminal Vin, and the step-down output circuit 100 is used to receive the voltage signal of the circuit input terminal Vin and output the first voltage signal after the step-down; the output drive circuit 200 and the step-down output circuit 100 The output terminal of the circuit 300 is connected to the circuit input terminal Vin, and receives the first voltage signal to charge the bootstrap capacitor C1 of the upper-arm switch tube Q1; the main control circuit 300 is connected to the circuit input te...

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Abstract

The invention is applicable to the technical field of electronic circuits, and provides a step-down power supply circuit structure and electrical equipment, and the circuit structure comprises a step-down output circuit, an output driving circuit, a main control circuit and a step-up output circuit. The voltage signal of the input end of the circuit is detected through the main control circuit, when the voltage signal of the input end of the circuit is lower than the preset target voltage signal, it is determined that the voltage signal of the input end of the circuit and the target voltage signal meet the first condition, and at the moment, the main control circuit outputs the enable control signal to the boost output circuit; the boost output circuit boosts the voltage of the input end of the circuit and then outputs the bootstrap capacitor for charging, so that the bootstrap capacitor can be charged in a bootstrap manner, an upper bridge arm switching tube reaches an on state with a 100% duty ratio, and the output voltage of the buck power supply circuit structure is increased to be close to or the same as the input voltage. Therefore, the voltage drop between input and output voltages is reduced as much as possible.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a step-down power supply circuit structure and a step-down power supply. Background technique [0002] With the diversification of the functionality of electronic products, the internal circuits of electronic products usually include circuit structures of different systems, and these circuit structures may work in different voltage environments, which requires the use of voltage boost or step-down technology, such as Step-down power supply, the step-down power supply can convert the input high voltage into a stable low voltage output, thereby supplying power to the key system of the circuit. [0003] In the common MCU-controlled buck synchronous step-down power supplies on the market, two NMOS are generally used as switches, such as figure 1 As shown in the figure, the driving voltage of the upper bridge arm switch Q1 is provided by the bootstrap capacito...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M3/157
CPCH02M3/158H02M3/157Y02B70/10
Inventor 黄始文
Owner SHENZHEN TOPBAND CO LTD
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