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Power supply

A technology of power supply and output power, applied in current collectors, instruments, electric vehicles, etc., can solve the problem of energy consumption of rectifier diodes

Pending Publication Date: 2021-03-30
通嘉科技(深圳)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Only the forward voltage (forward voltage) required for the rectifier diode to turn on makes the rectifier diode a fixed energy-consuming component

Method used

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Embodiment Construction

[0066] In this specification, there are some same symbols, which represent components with the same or similar structure, function, and principle, and can be deduced by those skilled in the art based on the teaching of this specification. For the sake of brevity in the description, components with the same symbols will not be repeated.

[0067] figure 1 A synchronous rectification flyback switching power supply 10 according to the present invention is shown, which has a transformer 18, a primary side controller 14, a secondary side controller 12, a power switch NMP, a rectification switch NMS, and an output capacitor 17 .

[0068] The transformer 18 includes a primary winding LP, a secondary winding LS, and a detection winding LA that are inductively coupled to each other. In exemplary embodiments, the transformer 18 can also have other primary-side or secondary-side windings. The main winding LP on the primary side and the power switch NMP are connected in series between t...

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Abstract

The embodiment of the invention provides a power supply. The power supply comprises a transformer, a rectification switch, a secondary side synchronous rectification controller and two diodes. The transformer has a primary winding, a secondary winding, and a sense winding inductively coupled to each other. The rectification switch and the secondary side winding are connected in series between twooutput power lines. The secondary side synchronous rectification controller is connected to two end points of the sensing winding and controls the rectification switch according to two end signals onthe two end points. The two diodes are connected in series between the two end points in a back-to-back manner.

Description

technical field [0001] The present invention generally relates to a control method and controller for synchronous rectification of a power supply. Background technique [0002] In addition to requiring precise output voltage or output current for power supplies, power conversion efficiency (power conversion efficiency) is often one of the specifications that the industry cares about most. [0003] The traditional flyback switching power supply uses a transformer to separate the primary side and the secondary side. Through the switching of a power switch, the voltage across the main winding on the primary side changes. Due to inductive coupling, the voltage across the secondary winding creates an AC portion which, after rectification, can supply the load located on the secondary side. [0004] For rectification on the secondary side, the simplest way is to use a rectifier diode. Only the forward voltage required for the rectifier diode to turn on makes the rectifier diode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02J7/10
CPCH02J7/06H02M3/33523H02M3/33592Y02B70/10
Inventor 林崇伟李弘庆吴宗谦吴柏毅
Owner 通嘉科技(深圳)有限公司