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Device and method for preventing current backfeeding in synchronous rectification circuit

A circuit current, synchronous rectification technology, applied in emergency protection circuit devices, output power conversion devices, high-efficiency power electronic conversion, etc. and other problems, to achieve the effect of small delay, strong real-time performance, and prevention of current backflow

Active Publication Date: 2019-08-27
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, implementing synchronous rectification with MOSFETs requires an appropriate drive circuit, which increases the complexity of synchronous rectification
At the same time, the MOSFET has bidirectional conductivity. Under some abnormal conditions, the MOSFET will flow a reverse current, causing the stress of the power device of the converter to exceed the standard. In more serious cases, the power device will be damaged.
Therefore, the power supply circuit using synchronous rectification technology has hidden dangers in reliability.

Method used

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  • Device and method for preventing current backfeeding in synchronous rectification circuit
  • Device and method for preventing current backfeeding in synchronous rectification circuit
  • Device and method for preventing current backfeeding in synchronous rectification circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0063] As shown in 1, this embodiment provides a device for preventing back-sinking of current in a synchronous rectification circuit. The device includes a sampling circuit 120, a comparison circuit 130, and a rectification control circuit 140;

[0064] The input terminal of the sampling circuit 120 is connected to the main power circuit 110;

[0065] The input terminal of the comparison circuit 130 is connected to the output terminal of the sampling circuit 120;

[0066] The input terminal of the rectifier control circuit 140 is connected to the output terminal of the comparison circuit 130, and the output terminal is connected to the main power circuit 110;

[0067] The output terminal of the synchronization control circuit 150 is connected to the comparison circuit, and is used to control the operating frequency of the comparison circuit to be synchronized with the operating frequency of the main power circuit;

[0068] The sampling circuit 120 is configured to sample the electrical...

Embodiment 2

[0104] Such as Figure 4 As shown, this embodiment provides a method for preventing backflow in a rectifier circuit, and the method includes:

[0105] Step S110: Perform electrical signal sampling on the main power circuit to form a sampling signal;

[0106] Step S120: compare the sampled signal with a preset value to form a comparison result;

[0107] Step S130: Turn on or turn off the synchronous rectifier tube of the main power circuit according to the comparison result;

[0108] Wherein, the operating frequency of the comparison circuit forming the comparison result is synchronized with the operating frequency of the main power circuit.

[0109] In the method described in this embodiment, the main power circuit is sampled. When the current back-injection occurs, the main power circuit is directly sampled, which can be learned in time; and by controlling the operating frequency of the comparison circuit and the operating frequency of the main power circuit Synchronization, and then ...

example 1

[0119] Such as Figure 5 with Figure 6a As shown, this example provides a device for preventing back-sinking of current in a synchronous rectification circuit, and the device includes:

[0120] Main power circuit 101, comparison circuit 104, sampling circuit, synchronization control circuit, and rectification control circuit 105. In this example, the sampling circuit is the current sampling circuit 102; the rectification control circuit is Figure 5 The synchronous rectification control circuit shown in, the specific structure can be as Figure 6a The circuit shown by reference numeral 105; the synchronization control circuit may include such as Figure 6a Shown in the frequency synchronization circuit 103.

[0121] The primary side of the main power circuit includes four switching tubes, and the switching tubes are all MOSFET tubes, and they are VT1, VT2, VT3, and VT4, respectively. Among them, VT1 and VT2 are connected in series to form a first path; VT3 and VT4 are connected in...

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Abstract

Disclosed are an apparatus and method for preventing backward current flow of a synchronous rectification circuit. The apparatus comprises: a sampling circuit (120), a comparison circuit (130), a rectification control circuit (140) and a synchronous control circuit (150); the input end of the sampling circuit (120) is connected to a main power circuit (110); the input end of the comparison circuit (130) is connected with the output end of the sampling circuit (120); the input end of the rectification control circuit (140) is connected with the output end of the comparison circuit (130) while the output end of the rectification control circuit (140) is connected with the main power circuit (110); the output end of the synchronous control circuit (150) is connected with the comparison circuit (130) to control the operating frequency of the comparison circuit (130) and the operating frequency of the main power circuit (110) to be synchronous; the sampling circuit (120) is used for sampling the electric signals of the main power circuit (110) to generate a sampling signal; the comparison circuit (130) is used for receiving the sampling signals from the sampling circuit and comparing the sampling signals with a preset value to generate a comparison result; and the rectification control circuit (140) is used for receiving the comparison result and switching on or off the synchronous rectifier tube of the main power circuit (110) according to the comparison result. Also disclosed is a computer storage medium.

Description

Technical field [0001] The invention relates to the field of electronic equipment, and in particular to a device and method for preventing back-sinking of current in a synchronous rectification circuit. Background technique [0002] With the rapid development of electronic technology, many applications require lower and lower operating voltages and larger currents. In the case of outputting low voltage and high current, the ratio of diode loss to output power is very large, so traditional diode rectification is no longer suitable for low voltage and high current circuits. Someone proposed to apply the synchronous rectification technology to the power supply system. The synchronous rectification circuit uses a metal-oxide-semiconductor-field effect transistor (MOSFET for short) with a small on-resistance instead of diode rectification. Because the MOSFET conduction loss is much smaller than that of a diode, the synchronous rectification technology effectively improves the power e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219H02H7/125
CPCH02M7/219Y02B70/10
Inventor 程周立
Owner ZTE CORP