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A circuit and method for reducing light load power consumption

A light-load, switching circuit technology, applied in the direction of output power conversion devices, electrical components, high-efficiency power electronics conversion, etc., can solve the problem of damaging the light-load or no-load efficiency of isolated conversion circuits

Active Publication Date: 2020-04-17
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, the value of the optocoupler current Iopto is larger at light load or no-load, and when the output power Pout of the isolated switch circuit 10 reaches the minimum value, the optocoupler current Iopto will reach the maximum value, which will seriously damage the isolated conversion Light-load or no-load efficiency of the circuit

Method used

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  • A circuit and method for reducing light load power consumption
  • A circuit and method for reducing light load power consumption
  • A circuit and method for reducing light load power consumption

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Embodiment Construction

[0021] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0022] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...

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Abstract

The invention discloses a feedback circuit of an isolated switch circuit and a control method thereof. The isolated switch circuit includes a power circuit, a control circuit and a feedback circuit. The feedback circuit includes an optocoupler and a variable resistance circuit connected in series with the photosensitive transistor of the optocoupler. The feedback circuit detects the load of the isolated switch circuit, and adjusts the equivalent resistance value of the variable resistance circuit according to the detection result, so that the current flowing through the optocoupler is at a low level in the very light load mode. The feedback circuit and control method disclosed by the invention can reduce the light-load or no-load loss of the isolated switch circuit and improve the working efficiency of the circuit.

Description

technical field [0001] The present invention relates to an electronic circuit, in particular, to a control circuit in a switching converter circuit. Background technique [0002] figure 1 A conventional isolated switch circuit 10 is shown, including a primary circuit 101 and a secondary circuit 103 coupled through a coupling device 102 . In order to control the conversion of input and output power, the isolated switch circuit 10 needs to feed back output power information from the secondary circuit 103 to the primary circuit 101 . In order to realize the isolation of the primary and secondary sides and protect the secondary side circuit from the high voltage of the primary side, the optocoupler 106 is usually used for the transmission of the feedback signal of the primary and secondary sides. exist figure 1 In the existing isolated switch circuit 10 shown, the output voltage Vout is applied to the photodiode D0 of the photocoupler 106 through the secondary side feedback c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/00H02M1/08
CPCH02M1/08H02M1/0025H02M3/33523Y02B70/10H02M1/0032H02M1/10H02M1/4208H02M3/156H02M5/22H02M3/1566
Inventor 陆文斌缪磊
Owner CHENGDU MONOLITHIC POWER SYST