Optimization Design and Control of Power Quality for Light-Loaded Server Power Supplies

doi:10.16628/j.cnki.2095-8188.2025.08.010

Abstract

Abstract:

The issue of degraded power quality in server power supplies under light-load conditions is addressed by proposing a light-load power quality optimization control strategy.By analyzing the traditional control strategies and the characteristics of EMI filter circuits,an X-capacitor current compensation control strategy is proposed to improve the power factor under light-load conditions.A hybrid control strategy combining offset lifting,variable gain,and average current restoration in discontinuous conduction mode (DCM) is adopted to optimize the input current total harmonic distortion (THD) under light-load conditions.A 1 300 W server power supply prototype is developed.The experimentcl results demonstrate that the proposed optimization control strategy significantly improves power quality under light-load conditions,with both power factor and input current THD meeting the specification requirements,which verifies the effectiveness and superiority of the proposed strategy.

Key words: server power supply, light-load power quality, X-capacitor current compensation, hybrid control strategy

CLC Number:

TM46

LI Yongle, ZHANG Shuwei, ZHANG Wenkang, MAO Xingkui. Optimization Design and Control of Power Quality for Light-Loaded Server Power Supplies[J]. LOW VOLTAGE APPARATUS, 2025, 0(8): 70-78.

Figures/Tables 22

References 13

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功率因数(PF)		输入电流总谐波失真(iTHD)
输出功率	指标要求	输出功率	指标要求
10%负载	>0.90	>5%负载&≤10%负载	≤20%
20%负载	>0.96	>10%负载&<20%负载	≤15%
50%负载	>0.98	≥20%负载	≤10%
100%负载	>0.99	≥40%负载	≤8%
		≥50%负载	≤5%

参数	数值
交流输入电压范围/V	90~264(160~240)
交流额定输入电压/V	230/50 Hz
PFC电感/μH	470
母线电容/μF	820
开关频率/kHz	65
满载输出功率/W	1 300

输入电压	带载情况	PF	iTHD/%
200 V/50 Hz	5%负载	0.900 7	20.30
	10%负载	0.949 7	20.13
	20%负载	0.982 7	10.18
	40%负载	0.994 1	3.95
	50%负载	0.996 9	3.67
	100%负载	0.999 2	3.56
240 V/60 Hz	5%负载	0.774 9	24.49
	10%负载	0.886 3	22.29
	20%负载	0.954 2	14.11
	40%负载	0.979 0	5.80
	50%负载	0.988 4	4.79
	100%负载	0.998 7	4.08

输入电压	带载情况	PF	iTHD/%
200 V/50 Hz	5%负载	0.938 0	8.70
	10%负载	0.976 2	8.78
	20%负载	0.988 6	5.21
	40%负载	0.998 0	2.79
	50%负载	0.999 0	2.83
	100%负载	0.999 0	3.04
240 V/60 Hz	5%负载	0.841 5	10.90
	10%负载	0.942 3	9.04
	20%负载	0.978 7	7.93
	40%负载	0.990 8	2.93
	50%负载	0.995 4	3.23
	100%负载	0.999 0	3.98

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