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Feedback circuit and control method for isolated power converter

A technology of a power converter and a feedback circuit, which can be applied to control/regulating systems, output power conversion devices, instruments, etc., can solve the problems of reduced efficiency of the power converter 10, inconvenience of an isolated power converter, and energy consumption, etc. To achieve the effect of improving light load performance

Inactive Publication Date: 2014-02-19
RICHTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rise of the current Id and Icomp also means the consumption of energy, which will cause the efficiency of the power converter 10 to decrease under light load.
[0004] Therefore, there are above-mentioned inconveniences and problems in the known isolated power converters.

Method used

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  • Feedback circuit and control method for isolated power converter
  • Feedback circuit and control method for isolated power converter
  • Feedback circuit and control method for isolated power converter

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Embodiment Construction

[0048] The present invention will be further described below in conjunction with embodiment and accompanying drawing.

[0049] see now figure 1 and figure 2 , figure 1 is a known schematic diagram of an isolated power converter, figure 2 It is a schematic diagram of the feedback circuit of the present invention. As shown in the figure, in the feedback circuit 30, the optocoupler 40 includes a transistor 42 as an output terminal connected between the power supply voltage Vcc and the current-to-voltage converter 46 and a light emitting diode 44 coupled to the output terminal of the power converter 10 , the current Id passing through the LED 44 and related to the output voltage Vout is amplified by the optocoupler 40 to generate a current Icomp passing through the transistor 42, and a reversed polarity regulator (reversed polarity regulator) 48 is connected to the optocoupler 40 to control the current Id so that It decreases or increases with the rise or fall of the output ...

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Abstract

The invention relates to a feedback circuit for an isolated power converter. The isolated power converter comprises a controller, and a power switch is switched so as to convert input voltage into output voltage. The feedback circuit is characterized by comprising a photo-coupler, a current-voltage converting circuit, a voltage source and a start-up circuit, wherein the current-voltage converting circuit is coupled to a second voltage source, and one of the first voltage and the second voltage is selected as a feedback signal for the controller. The feedback circuit and the control method for the isolated power converter have the advantage of ability of improving the underloading efficiency of the isolated power converter.

Description

technical field [0001] The invention relates to an isolated power converter, in particular to a feedback circuit and a control method of the isolated power converter. Background technique [0002] figure 1 A known isolated power converter 10 is shown, in which a rectifier circuit 12 converts an AC voltage VAC into a DC voltage Vin, the voltage Vin is supplied to the primary coil Lp of a transformer T1 through a snubber 16, and a power switch 18 is connected to the transformer For the primary side coil Lp of T1, the controller 14 generates a control signal Vgate to switch the power switch 18 according to the feedback signal Vcomp and the sensing signal Vcs to convert the voltage Vin into an output voltage Vout, and the sensing signal Vcs is proportional to the primary side coil Lp The controller 14 has a power input terminal VDD for receiving the power voltage Vcc, and the feedback circuit 20 detects the output voltage Vout to generate a feedback signal Vcomp to the controll...

Claims

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Application Information

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IPC IPC(8): H02M1/08H02M3/335
Inventor 戴良彬林梓诚范振炫
Owner RICHTEK TECH