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Power circuit of switching power converter

A switching power supply and power circuit technology, applied in the direction of adjusting electrical variables, high-efficiency power electronic conversion, converting DC power input to DC power output, etc. Effects of Standby Power Consumption

Active Publication Date: 2015-07-22
GIANTEC SEMICON LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This principle is relatively simple, but its disadvantage is that the peripheral circuit is complicated and the quiescent current of the circuit is relatively large.

Method used

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  • Power circuit of switching power converter
  • Power circuit of switching power converter
  • Power circuit of switching power converter

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] Figure 4 A schematic diagram of a switching power supply system according to an embodiment of the present invention is shown. The figure shows a secondary side feedback flyback (Flyback) voltage adapter system. The function of the adapter is to convert the alternating current (90V~260V) into a constant output voltage. Figure 4 From the perspective of the system, it shows the connection relationship between the switching power supply control chip and the peripheral circuit. exist Figure 4 in, with figure 2 The same reference numerals denote the same elements.

[0035] Figure 4 The switching power supply control chip 405 has 6 pins: HV, VDD, GATE, GND, CS, FB. The feedback network 404 adopts a resistor divider network, through the error amplification of TL431, the output result is transmitted to the FB pin through the optocoupler device 404a. The power switch is a MOS power switch M1. The gate of the power switch M1 is connected to the GATE pin of the switchi...

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PUM

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Abstract

The invention relates to a power circuit of a switching power converter. The power circuit of the switching power converter comprises a current source and a comparator. The current source provides current for a power end from the switching power converter. The comparator compares power voltage of the power end with first reference voltage and sends a first control signal to turn off the current source when the power voltage reaches the first reference voltage. By the use of the power circuit, enough energy can be provided in turning-on process to allow the power end to reach an operation threshold value to further allow a chip to normally operate, the current source can be turned off after the power end meets the requirement for a system, and the requirement for ultra-low standby power consumption of the system is achieved.

Description

technical field [0001] The invention relates to a switching power converter, in particular to the design of a power supply circuit of the switching power converter. Background technique [0002] Due to many advantages compared with traditional linear power supplies, such as higher efficiency, lower standby power consumption, lower cost, smaller size and lighter weight, switching power supplies are more and more widely used Used in various electronic equipment. [0003] figure 1 Shows the basic block diagram of the most widely used current mode switching power supply system. The system includes a switching power converter 101 , a switching power supply controller 102 , and a feedback network 103 . The switching power converter 101 has a power input port IN and a power output port OUT. The switching power supply controller 102 outputs a switching control signal to the switching power converter 101 , and the switching power converter 101 outputs a current control signal to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/36
CPCY02B70/16Y02B70/10
Inventor 刘慧明王为黄剑锋
Owner GIANTEC SEMICON LTD