Synchronous rectificating device

A technology of synchronous rectification and rectification circuit, which is applied in the conversion device of output power, the conversion of AC power input to DC power output, electrical components, etc., can solve the problem that the power transmission efficiency cannot be effectively improved

Inactive Publication Date: 2004-02-04
DELTA ELECTRONICS INC
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  • Abstract
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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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  • Synchronous rectificating device

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Embodiment Construction

[0047] Please refer to FIG. 3 , which is a schematic diagram of a block structure of a preferred embodiment of the present invention. The synchronous rectification device 20 shown in FIG. 3 includes: an input unit 21, a control unit 22 and an output unit 23; wherein , the input unit 21 may include a signal detection circuit 211, a rectification circuit 212, a signal amplification circuit 213, a first transformer element group T1, a second transformer element group T2, a third transformer element group T3 and a bridge rectifier circuit composed of 4 transistors Qa, Qb, Qc, Qd (for example, can all be a metal oxide field effect (MOSFET) transistor); in addition, the output unit 13 includes a first filter Inductance circuit L1 (for example, can be a first filter inductor), a second filter inductor circuit L2 (for example, can be a second filter inductor), a filter capacitor circuit C (for example, can be a filter capacitor), a fourth transformer element group T4, a first, second ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/00
Inventor 黄嘉熊杨联亮林添昌
Owner DELTA ELECTRONICS INC
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