Synchronous rectificating device

Abstract

A synchro rectification device, includes: a input unit, it corresponds a AC input signal and outputs a processing signal; a control unit, the electricity connect with input unit and have a pulse timer control circuit, to produce no.1 and no.2 driving control signal, when no.1 driving control signal turns to no.2 state from no.1 state, the no.2 driving control signal is still at the no.2 state and turns to the no.2 state after through the no.2 pulse time difference, or when the no.2 driving control signal turns to the no.1 state from the no.2 state, the no.1 driving control signal is still at the no.2 state and after through the no.2 pulse time different it could turn to the no.1 state; as well as a output unit, the electricity connects with the input unit and the control unit, and have the no.1 and no.2 switch control circuit.

Description

(1) Technical field [0001] The present invention relates to a synchronous rectification device, in particular to a synchronous rectification device applied to drive a synchronous rectification transistor with a transformer. (2) Background technology [0002] In the current power supply (Power Supply) products, a synchronous rectifier (Synchronous Rectifier) ​​device including a transformer as a driving synchronous rectifier transistor is often used, so that the AC input signal can perform a more efficient rectification and filtering action ;like figure 1 As shown in the figure, a schematic diagram of a block structure of a conventional synchronous rectification device 10 is shown; figure 1 The synchronous rectification device 10 includes: an input unit 11, a control unit 12 and an output unit 13; wherein, the input unit 11 includes a signal detection circuit 111, a rectification circuit 112, a signal amplification circuit 113, a first A transformer element group T1, a seco...

AI Technical Summary

Problems solved by technology

[0012] However, the lack of the conventional method is: the method of adding the output current detection device S at the output of the synchronous rectification device 10, although the problem caused by the reverse current Ir can be solved, on the other hand, it also leads to high loads. In this case, the additional power consumption will be increased instead, so that the transmission efficiency of the power supply cannot be effectively improved.

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