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Control system for reducing CRM-Buck-PFC converter capacitor ripple current

A crm-buck-pfc, ripple current technology is applied in the field of control systems for reducing the ripple current of CRM-Buck-PFC converter capacitors, and can solve problems such as evaporation, shortening capacitor life, and reducing capacitance.

Active Publication Date: 2019-09-06
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ESR value of the electrolytic capacitor is large, and the high-frequency and low-frequency ripple current passing through it causes the heating of the electrolyte, causing it to evaporate
As a result, as the working time increases, the value of ESR increases and the capacitance decreases, shortening the life of the capacitor

Method used

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  • Control system for reducing CRM-Buck-PFC converter capacitor ripple current
  • Control system for reducing CRM-Buck-PFC converter capacitor ripple current
  • Control system for reducing CRM-Buck-PFC converter capacitor ripple current

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Experimental program
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Embodiment

[0029] 1. The working principle of CRM Buck PFC converter

[0030] figure 1 It is the main circuit of Buck PFC converter. For the convenience of analysis, the following assumptions are made first: 1. All devices are ideal components; 2. The output voltage ripple is small compared to its DC value; 3. The switching frequency is much higher than the input voltage frequency.

[0031] Names of main symbols in the accompanying drawings of this embodiment: v in , supply voltage; i in , input current; RB, rectifier bridge; v g , rectified output voltage; i Lb , inductor current; L b , inductance; Q b , switch tube; D b , diode; C o , output filter capacitor; ESR, capacitor equivalent series resistance; I c , into the capacitor current; I 3 * , the third harmonic current; R Ld , load; V o , output voltage; i Lb_pk , inductor current peak value; i Lb_av , the average value of the inductor current; V ref , the reference voltage of the output voltage feedback control; v E...

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Abstract

The invention relates to a control system for reducing CRM-Buck-PFC electrolytic capacitor ripple current. The design circuit comprises a main power circuit, an output voltage feedback control circuit, an input voltage feedforward circuit, a multiplier and a sawtooth wave comparison and switching tube drive circuit. The control method of variable switching conduction time is put forward by introducing input voltage feedforward and output voltage feedback. The method reduces the ripple current of the electrolytic capacitor and minimizes the change range of the switching frequency and improves the efficiency by reducing the conduction loss of the power device.

Description

technical field [0001] The invention relates to a CRM-Buck-PFC converter, in particular to a control system for reducing the ripple current of a CRM-Buck-PFC converter capacitor. Background technique [0002] Power factor correction (PFC) has been widely used to reduce input current harmonics and improve input power factor. Compared with passive power supply, switching power supply using active power factor correction (PFC) technology has the advantages of small size, high cost performance and high power factor. Different types of active PFC control schemes and topologies have been proposed to meet specification standards and reduce harmonics. Buck, Boost and Buck-Boost converters are the most widely used in active switching power supplies. Boost converters are the most widely used topology for PFC applications due to their simplicity and inherent current shaping capability. However, it is less efficient at lower input voltages than at higher input voltages. Therefore, B...

Claims

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Application Information

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IPC IPC(8): H02M1/14H02M1/42
CPCH02M1/14H02M1/42H02M1/0022H02M1/4283Y02B70/10
Inventor 哈比卜姚凯陈杰楠邬程健张震
Owner NANJING UNIV OF SCI & TECH