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Unit and method for synchronous rectification control

A technology of synchronous rectification and control unit, applied in control/regulation systems, electrical components, conversion of DC power input to DC power output, etc., can solve the problems of increased circuit production cost, high implementation complexity, low efficiency, etc.

Active Publication Date: 2017-05-31
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, conventional schemes are generally inefficient because a significant portion of the power flows through the body diode of the power switch when the switch is on
In addition, the implementation complexity of the traditional scheme is high, which increases the production cost of the circuit

Method used

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  • Unit and method for synchronous rectification control
  • Unit and method for synchronous rectification control
  • Unit and method for synchronous rectification control

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Embodiment Construction

[0096]The embodiments described in the present invention are limited to a synchronous rectification control unit and a method for controlling synchronous rectification, which will be implemented in the embodiments described below. These embodiments may, however, be exemplary and may take many different forms, and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete .

[0097] Other objects and features will also be apparent from the following detailed description considered in conjunction with the accompanying drawings. It should be understood, however, that the drawings are for illustration only and not as a limitation of the embodiments; for embodiments, reference should be made to the appended claims. Further, the drawings are not necessarily drawn to scale, and unless otherwise indicated, they are merely conceptual illustrations of structures and flows.

[0098...

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PUM

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Abstract

A synchronous rectification control unit and a method for synchronous rectification control are presented. The synchronous rectification control unit includes a voltage pulse generation circuit (26) configured to measure a current I in a circuit (200) including a power switch (50), and to output a logic high value for a first voltage V1 (28), if the current I has a positive change rate adjacent to a value of zero for the current I, or to output a logic high value for a second voltage V2 (29) if the current I has a negative change rate adjacent to a value of zero for the current I. The synchronous rectification control unit also includes a control algorithm circuit (27) configured to generate first and second synchronous pulse width modulation, PWM, control signals SQ1 (32) and SQ2 (33), and based on first and second non-synchronous PWM control signals Q1 (30) and Q2 (31), and based on the first voltage V1 (28) and said second voltage V2 (29), the first and second synchronous PWM control signals SQ1 (32) and SQ2 (33) being usable for controlling switching of the power switch (50).

Description

technical field [0001] The embodiments described herein generally relate to a synchronous rectification control unit and a synchronous rectification control method. In particular, a mechanism for generating first and second synchronous pulse width modulation (PWM) control signals for controlling switching power switches is described herein. Background technique [0002] Power switches, such as those implemented using Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) or other suitable types of transistors, are used in a large number of circuits today. Such power switches are used as power converters, for example, and they can be implemented as half-bridge power converters or full-bridge power converters. For example, a full bridge power converter circuit may include a synchronous side and a non-synchronous side. In such a circuit, the non-synchronous side is the side that inputs the original / non-converted signal / power, and the synchronous side is the side that ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/13H02M3/335H03K5/1534H03K5/1536
CPCH02M1/38H02M3/33584H03K5/1534H03K5/1536H03K17/13H03K2017/307H02M1/0009H02M1/0058H02M1/0064Y02B70/10
Inventor 马军乔治斯·特森格涅斯格罗弗·维克多·托瑞克·巴斯科佩
Owner HUAWEI TECH CO LTD