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A step-down conversion circuit

A technology for converting circuits and circuits, applied in the direction of converting DC power input to DC power output, electrical components, adjusting electrical variables, etc., can solve problems such as low voltage, control circuit and drive circuit cannot maintain normal operation, etc. Low standby power consumption and high reliability

Active Publication Date: 2020-10-09
SHENZHEN SINEXCEL ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The auxiliary windings proportional to this voltage have a lower voltage after rectification, so that the control circuit and drive circuit will not be able to maintain normal operation

Method used

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  • A step-down conversion circuit
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  • A step-down conversion circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0031] An embodiment of the present invention provides a step-down conversion circuit, see figure 1 , used to supply power to the control circuit 1, including the main switch tube Q1, the switch tube Q2 and the transformer T1;

[0032] The input terminal of the main switching tube Q1 is connected with a working pulse signal, so that the main switching tube Q1 is turned from cut-off to conducting; the output terminal of the main switching tube Q1 is connected to the transformer T1 to start the transformer T1;

[0033] The input terminal of the switching tube Q2 is connected with a narrow pulse signal when the circuit is light-loaded, so that the switching tube Q2 turns from cut-off to conducting; the output terminal of the switching tube Q2 is connected to the transformer T1, forcing the The reflected voltage of transformer T1 reaches the output voltage to provide a stable auxiliary power supply.

[0034] It should be noted that the switch tube Q2 is a low-power switch tube, ...

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PUM

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Abstract

The invention discloses a buck conversion circuit which is used for powering a control circuit. The buck conversion circuit comprises a main switch tube, a switch tube and a transformer. The input endof the main switch tube is connected with a working pulse signal, so that the cut-off main switch tube is turned on. The output end of the main switch tube is connected with the transformer to startthe transformer. The input end of the switch tube is connected with a narrow pulse signal when the circuit is lightly loaded, so that the cut-off switch tube is turned on. The output end of the switchtube is connected with the transformer to force the reflected voltage of the transformer to reach output voltage to provide a stable auxiliary power supply. According to the invention, when the circuit is lightly loaded, the stable auxiliary power supply is provided to power the control circuit and the like.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a step-down conversion circuit. Background technique [0002] For the BUCK step-down circuit with high working voltage, in order to work reliably, it is necessary to use an additional auxiliary power supply to supply power for the drive circuit and control circuit of the high-side field effect transistor respectively. In order to simplify the circuit and reduce the cost, the startup resistor can be used to realize power-on startup, and the auxiliary winding on the output inductor can be used to continuously supply power. [0003] However, for the existing step-down circuit, when the output is no-load (almost only the sampling resistor of the voltage feedback is used as the load), the working duty cycle is extremely small, and the current of the transformer is also small. After the circuit turns from on to off, the transformer continues to flow, and the current of the transfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33569
Inventor 龙成强
Owner SHENZHEN SINEXCEL ELECTRIC