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Synchronous rectifier applied to secondary side of power converter and operation method thereof

A technology of synchronous rectifier and power converter, which is applied in the direction of high-efficiency power electronic conversion, output power conversion device, conversion of AC power input to DC power output, etc., which can solve problems such as wasting energy and being unable to enter power-saving mode

Active Publication Date: 2019-12-10
LEADTREND TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, because the prior art judges whether the controller on the secondary side of the power converter enters a power-saving mode based on a fixed reference value and the prohibited turn-on time, the prohibited turn-on time will vary with the output voltage changes, so the controller on the secondary side of the power converter may not be able to enter the power saving mode because the prohibition on time will vary with the output voltage, resulting in that when the power converter operates at The discontinuous conduction mode or the quasi-resonant mode wastes too much energy

Method used

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  • Synchronous rectifier applied to secondary side of power converter and operation method thereof
  • Synchronous rectifier applied to secondary side of power converter and operation method thereof
  • Synchronous rectifier applied to secondary side of power converter and operation method thereof

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Embodiment Construction

[0031] Please refer to figure 1 , figure 1 It is a schematic diagram of a synchronous rectifier 200 applied to the secondary side SEC of the power converter 100 disclosed in the first embodiment of the present invention, wherein the primary side PRI of the power converter 100 only has a primary side winding 102 and a power switch 104 show on figure 1 , and the power converter 100 is an AC / DC power converter. Such as figure 1 As shown, the synchronous rectifier 200 includes a prohibition turn-on time generation circuit 202, a power-saving mode signal generation circuit 204, and a controller 206, wherein as figure 1 As shown, the prohibition on time generation circuit 202 is coupled to the drain terminal of the synchronous switch 106 of the secondary side SEC of the power converter 100, and the power saving mode signal generation circuit 204 is coupled to the prohibition on time generation circuit 202 and the power conversion The output terminal of the secondary side SEC of ...

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Abstract

The invention discloses a synchronous rectifier applied to the secondary side of a power converter and an operation method thereof. The synchronous rectifier comprises a forbidden turn-on time generation circuit, a power saving mode signal generation circuit and a controller. The forbidden turn-on time generation circuit generates a forbidden turn-on time corresponding to the secondary side. The power saving mode signal generation circuit enables a power saving mode signal when the forbidden turn-on time is greater than a reference value at least once and turns off the power saving mode signalwhen the forbidden turn-on time is continuously less than the reference value for a predetermined number of times. The controller enters a power saving mode when the power saving mode signal is enabled and leaves the power saving mode when the power saving mode signal is turned off. Therefore, the reference value changes with the output voltage so that the controller can still enter the power saving mode when the forbidden turn-on time changes with the output voltage.

Description

technical field [0001] The present invention relates to a synchronous rectifier applied to the secondary side of a power converter and an operating method thereof, in particular to a method that can be used according to a reference value that changes with the output voltage of the power converter and the secondary side of the power converter. The prohibition on time of the secondary side, the synchronous rectifier and its operation method for judging whether the controller of the secondary side of the power converter enters the power saving mode. Background technique [0002] When a power converter operates in a discontinuous conduction mode (discontinuous conduction mode, DCM) or a quasi resonant mode (quasi resonant mode), the primary side controller applied to the primary side of the power converter generates a corresponding A gate control signal of a burst mode is used to control the power switch on and off of the primary side, wherein the number of gate control signals ...

Claims

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Application Information

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IPC IPC(8): H02M7/217
CPCH02M7/217Y02B70/10
Inventor 林崇伟邹明璋黄俊豪
Owner LEADTREND TECH
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