冗余电源自动电流均衡控制策略

doi:10.16180/j.cnki.issn1007-7820.2024.05.006

Abstract

Abstract:

Redundant power supplies are commonly used in systems that require long-term uninterrupted operation and high reliability. When redundant power supplies are used as N+1 backup power supplies to supply power to devices at the same time, parallel current sharing must be considered.In order to solve the problem of large loss of passive redundant power supply and inability to achieve current equalization, this study adopts the design scheme of active redundancy and designs a 1+1 redundant power supply system with two parallel DC voltage inputs.The system uses GD32E103 as the main control chip. By changing the on-resistance of MOSFET(Metal-Oxide Semiconductor Field Effect Transistor), PI(Proportional Integral) control is adopted to realize the automatic balance of the output current of two redundant power supplies.The simulation and experimental results show that the active redundancy design scheme can achieve the purpose of automatic current equalization.In normal operation, the maximum error of the two current channels is less than 0.1 A, and the accuracy of current sharing meets the design requirements.

Key words: redundant power, MOSFET, PI control, automatic current equalization, low power, high precision, microcontroller, PWM, low voltage

CLC Number:

TP23

CHI Kangwei, XIE Suxia, HUANG Song, WANG Jinhao. Research on Automatic Current Equalization Control Strategy of Redundant Power Supply[J].Electronic Science and Technology, 2024, 37(5): 38-46.

Figures/Tables 20

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参数	数值
仿真步长/s	0.000 001
控制频率/kHz	10
电压环比例参数K_VP	24
电压环积分参数K_VI	6 400
电流环比例参数K_CP	24
电流环积分参数K_CI	6 400
输入电压U₁/V	25
输入电压U₂/V	25
滤波电感L₁/H	0.000 010
滤波电感L₂/H	0.000 010
滤波电容C/F	0.000 001
电阻R/Ω	6

工作状态	两路直流电压输入
工况1	18 V<(U₁,U₂)<28 V 且 U₁=U₂
工况2	18 V<(U₁,U₂)<28 V 且 U₁>U₂
工况3	18 V<(U₁,U₂)<28 V 且 U₁<U₂

参数	数值
仿真步长/s	0.000 001
二极管Q₁导通压降/V	0.4
二极管Q₁内阻/Ω	0.001
二极管Q₂导通压降/V	0.4
二极管Q₂内阻/Ω	0.001
输入电压U₁/V	25.0
输入电压U₂/V	25.0
滤波电感L₁/H	0.000 01
滤波电感L₂/H	0.000 01
滤波电容C/F	0.000 001
电阻R/Ω	6.000

	无源冗余	有源冗余
系统实现	简单	复杂
稳态精度	低	高
均流特性	无	较好
功耗	高	低

直流输入 U₂/V	A路输出电流 /A	B路输出电流 /A	两路电流误差 /A
U₂=23.6	1.90	1.83	0.07
U₂=23.7	1.91	1.85	0.06
U₂=23.8	1.93	1.85	0.08
U₂=23.9	1.92	1.89	0.03
U₂=24.0	1.91	1.90	0.01
U₂=24.1	1.93	1.90	0.03
U₂=24.2	1.92	1.90	0.02
U₂=24.3	1.92	1.89	0.03
U₂=24.4	1.92	1.90	0.02

Research on Automatic Current Equalization Control Strategy of Redundant Power Supply

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References 19

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直流输入 U₁/V	A路输出电流 /A	B路输出电流 /A	两路电流误差 /A
U₁=23.6	1.88	1.86	0.02
U₁=23.7	1.89	1.87	0.02
U₁=23.8	1.90	1.88	0.02
U₁=23.9	1.91	1.87	0.04
U₁=24.0	1.92	1.90	0.02
U₁=24.1	1.92	1.90	0.02
U₁=24.2	1.95	1.87	0.08
U₁=24.3	1.96	1.88	0.08
U₁=24.4	1.95	1.87	0.08

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