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Control circuit and synchronous rectification control circuit

A control circuit, synchronous rectification technology, used in control/regulation systems, high-efficiency power electronic conversion, electrical components, etc.

Active Publication Date: 2014-01-15
SYST GEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Capacitor stores charge pump voltage

Method used

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  • Control circuit and synchronous rectification control circuit
  • Control circuit and synchronous rectification control circuit
  • Control circuit and synchronous rectification control circuit

Examples

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Embodiment Construction

[0047] In order to make the above objects, features and advantages of the present invention more comprehensible, a preferred embodiment will be described in detail below together with the accompanying drawings.

[0048] image 3 shows a power converter according to an embodiment of the present invention. By switching signal S W The controlled transistor 20 is coupled to switch the transformer 10 to convert from the input voltage V IN The energy is transferred to the output voltage of the power converter V O . When rectifier 35 (or the body diode of transistor 30) is turned on to transfer power from transformer 10 to output capacitor 40, transistor 30 will turn on to reduce rectifier 35 conduction losses (rectifier 35 forward bias voltage drop). The operation of transistor 30 makes it behave like a synchronous rectifier. The terminal DET of the synchronous rectification control circuit 50 is coupled to the transistor 30 and / or the transformer 10 to detect the signal S DET...

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Abstract

The invention relates to a synchronous rectification control circuit which is provided with a charge pump used for a power converter. The synchronous rectification control circuit comprises a synchronous rectification driver, a charge pump capacitor and a capacitor. The synchronous rectification driver is coupled with a transformer in a connected mode to generate control signals to switch a transistor. The charge pump capacitor is coupled with a power source in a connected mode to generate the charge pump voltage. The capacitor is used for storing the charge pump voltage. The transistor is coupled with the transformer in a connected mode, and the synchronous rectification control circuit is operated as a synchronous rectifier. The sufficient driving capacity of control signals is guaranteed through the charge pump voltage.

Description

technical field [0001] The present invention relates to a control circuit for synchronous rectification, and more particularly, the present invention relates to a control circuit for synchronous rectification with a charge pump to improve the efficiency of a power converter. Background technique [0002] Synchronous rectification technology has been disclosed in many prior art, for example, US Patent No. 6,995,991 titled "PWM Controller for Synchronous Rectifier of Flyback Power Converter", No. 7,440,298 titled "Synchronous Rectification Circuit for Power Converters" and US Patent No. 8,072,787 entitled "Synchronous Rectifying for Soft Switching Power Converters". [0003] figure 1 Indicates an existing power converter with synchronous rectification. By switching signal S W The controlled transistor 20 is coupled to switch the transformer 10 to convert from the input voltage V IN The energy is transferred to the output voltage of the power converter V O . When rectifie...

Claims

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Application Information

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IPC IPC(8): H02M1/08H02M3/335
CPCY02B70/10
Inventor 杨大勇王周升
Owner SYST GEN
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