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Mosfet bridge rectifier

A bridge rectifier and power converter technology, which is used in high-efficiency power electronic conversion, output power conversion devices, conversion of AC power input to DC power output, etc., can solve problems such as high cost and power loss, and achieve optimal performance. Effect

Inactive Publication Date: 2013-07-10
RICHTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The forward bias voltage of the diode is about 0.6V. Assuming that the peak current through the diodes D1, D2, D3 and D4 is 0.2A, the power loss of 0.076W will be caused when the diode is turned on.
However, the existing MOSFET bridge rectifier needs to use a high-voltage PMOSFET on the high side, such as referring to US Patent No. 7,411,768 and US Patent Publication No. 2009 / 0257259, so the cost is relatively high

Method used

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Embodiment Construction

[0049] refer to figure 2 , the bridge rectifier 20 according to the present invention has AC input terminals 28 and 30 for connecting to the AC voltage source VACIN and a DC output terminal 32 for connecting to the PFC power converter 22 . The bridge rectifier 20 includes NMOSFETs M1 , M2 , M3 and M4 , a floating gate driver 24 and a detector 26 . NMOSFET M1 is connected between the DC output terminal 32 and the AC input terminal 28, and is controlled by the control signal UG1; NMOSFET M2 is connected between the AC input terminal 28 and the ground terminal GND, and is controlled by the control signal LG2; NMOSFET M3 is connected to the DC The connection between the output terminal 32 and the AC input terminal 30 is controlled by the control signal UG2; the NMOSFET M4 is connected between the AC input terminal 30 and the ground terminal GND and is controlled by the control signal LG1. The detector 26 detects the voltages V1 and V2 of the AC input terminals 28 and 30 to gener...

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Abstract

A bridge rectifier is established by MOSFETs instead of diodes. The MOSFET bridge rectifier includes a voltage detector to detect the voltages of two AC input terminals of the MOSFET bridge rectifier, for identifying the positive and negative half cycles of an AC voltage input to the MOSFET bridge rectifier, thereby accurately controlling the MOSFETs.

Description

technical field [0001] The present invention relates to a rectifying circuit for converting AC to DC, in particular to a bridge rectifier. Background technique [0002] In the application of a power factor correction (Power Factor Correction; PFC) power converter, a bridge rectifier is required to convert an AC waveform into a DC waveform. like figure 1 As shown, the traditional bridge rectifier 10 uses four diodes D1 , D2 , D3 and D4 to form a bridge to rectify the AC voltage VACIN into a DC voltage VIN for the PFC power converter 12 . The forward bias voltage of the diode is about 0.6V. Assuming that the peak current passing through the diodes D1, D2, D3 and D4 is 0.2A, the diode will cause a power loss of 0.076W when it is turned on. [0003] In order to reduce the power loss of the bridge rectifier and improve performance, some bridge rectifiers have replaced diodes with metal oxide semiconductor field effect transistors (MOSFETs), such as US Patent No. 7,411,768 and U...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M1/08
CPCH02M7/219H02M7/2195Y02B70/10
Inventor 曾培凯何峻彻唐健夫陈曜洲
Owner RICHTEK TECH