An anti-current backflow circuit for buck converter

A converter and circuit technology, applied in the electrical field, can solve the problems of narrow operating temperature range, current inversion, lack of anti-irradiation characteristics, etc., to achieve the effect of improving reliability and stability and preventing current inversion

Active Publication Date: 2022-04-08
SHANGHAI INST OF SPACE POWER SOURCES
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Although the Buck converter controlled by the synchronous rectification mode improves the working efficiency of the system, it also brings about the current backflow phenomenon, which seriously affects the efficiency, life, safety and reliability of the secondary power supply system of the spacecraft.
The common anti-current synchronous rectification chips on the market do not have anti-radiation characteristics, and the operating temperature range is narrow, so they cannot work normally in extreme space environments, and do not meet the reliability and stability requirements.

Method used

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  • An anti-current backflow circuit for buck converter
  • An anti-current backflow circuit for buck converter
  • An anti-current backflow circuit for buck converter

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Embodiment Construction

[0033] A current backflow prevention circuit for a BUCK converter of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0034] A kind of anti-current backfeed circuit based on the synchronous Buck circuit proposed by the present invention, the circuit is as figure 1As shown, it consists of three parts, the first part is composed of Q1, Q2, Q3, R1, R2, R3, R4 and R5. When the Buck converter is in the continuous conduction mode, if M1 changes from off to on, point D1 will become high level before point D2, so during the conduction period of M1, transistors Q1 and Q3 will switch D3 and D4 The voltage at the point is always clamped low. When M1 is turned off, the inductor current continues to flow through the body diode of M2 during the dead time. When M2 is turned on, the inductor current continues to flow through M2, so the voltage at point D2 is always low during the period when M1 is turned off. . During the whol...

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Abstract

The invention discloses an anti-current inversion circuit for a buck converter, which can solve the current inversion problem of a buck converter controlled by a synchronous rectification mode. During this dead time, the low-end Mos tube V ds The high and low level states of the voltage are used to determine which operating mode the circuit is in, and then control the driving voltage of the low-side Mos tube, realizing that when the circuit is in the forced current continuous mode (FCCM, Forced Current Continuous Mode), the low-end is turned off. Mos tube-driven control logic function. The simulation results show that adding the anti-current backflow circuit can effectively prevent the current backflow phenomenon and improve the reliability and stability of the circuit. The circuit and control of the invention are simple in structure, convenient and reliable in implementation, and have been verified by circuit simulation software.

Description

technical field [0001] The invention belongs to the field of electricity, and in particular relates to an anti-current backflow circuit for a BUCK converter. Background technique [0002] Although the Buck converter controlled by the synchronous rectification mode improves the working efficiency of the system, it also brings about the current backflow phenomenon, which seriously affects the efficiency, life, safety and reliability of the secondary power supply system of the spacecraft. Currently, the common synchronous rectification chips that prevent current backflow in the market do not have anti-radiation characteristics, and the operating temperature range is narrow, so they cannot work normally in the extreme space environment, and do not meet the reliability and stability requirements. In response to this problem, the present invention proposes an anti-current backflow circuit based on a Buck circuit. After the low-side Mos tube is turned off by cycle-by-cycle detectio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02M3/158
CPCH02M1/32H02M3/1588
Inventor 汪超沈昂邹锦浪覃思明刘丽娟王邦兴王培飞王涵桂仁金仁淑
Owner SHANGHAI INST OF SPACE POWER SOURCES
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