Device and method for monitoring ESR (Equivalent Series Resistance) and C (Capacitance) of output capacitor in DCM boost converter

A boost converter and output capacitor technology, which is applied in the direction of output power conversion device, measurement device, capacitance measurement, etc., can solve the problems of inability to predict the life of electrolytic capacitors and power supplies, and inability to monitor the equivalent series resistance in real time, so as to reduce the The effect of small difficulty

Inactive Publication Date: 2016-08-31
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Among them, DCM Boost converters are widely used in the fields of DC motors, PFC power factor correction circuits, and DC power supplies. Therefore, it is very important to monitor the ESR and C of the output filter capacitor of the DCM Boost converter and

Method used

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  • Device and method for monitoring ESR (Equivalent Series Resistance) and C (Capacitance) of output capacitor in DCM boost converter
  • Device and method for monitoring ESR (Equivalent Series Resistance) and C (Capacitance) of output capacitor in DCM boost converter
  • Device and method for monitoring ESR (Equivalent Series Resistance) and C (Capacitance) of output capacitor in DCM boost converter

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[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] The present invention designs a device and method for online monitoring of the output filter capacitors ESR and C of a boost (Boost) converter operating in an inductor current discontinuous mode (DCM).

[0021] 1. Theoretical derivation:

[0022] figure 1 It is the working waveform in the switching cycle of the DCM Boost converter. When the switch tube Q b When conducting, diode D b off, the voltage across the inductor L is V in , its inductor current i L with V in The slope of / L rises linearly. When the diode D b When turned off, the inductor current i L through diode D b Freewheeling, at this time the voltage across the inductor L is V in -V o , the inductor current i L with (V in -V o ) / L declines in slope. Since the Boost converter operates in DCM mode, the inductor current i is L down to zero. Inductor cur...

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Abstract

The invention discloses a device and a method for monitoring ESR (Equivalent Series Resistance) and C (Capacitance) of an output capacitor in a DCM boost converter. The device comprises a boost converter main power circuit, a driving circuit, a display unit and a signal processing module, wherein the signal processing module comprises a power circuit control unit, a switching frequency fs calculation unit, a duty ratio D calculation unit, an output voltage trigger sampling unit and a capacitance ESR and C calculation unit; and according to the method, a PWM (Pulse Width Modulation) driving pulse signal of a switching tube is detected, the duty ratio D calculation unit calculates the duty ratio, the switching frequency fs calculation unit calculates the switching frequency of the converter, the output voltage trigger sampling unit detects the mean of the output voltage, samples the instantaneous value of the output voltage by triggering and sends the data to the capacitance ESR and C calculation unit, and the values of the current ESR and C of the output filter capacitor in the boost converter are obtained. The device and the method do not need a current sensor, do not influence normal operation of the converter, and provide a basis for predicting the service lives of a capacitor and a power supply.

Description

technical field [0001] The invention belongs to the technical field of monitoring in electric energy conversion devices, in particular to a monitoring device and method for output capacitors ESR and C of a DCM step-up converter. Background technique [0002] Due to the advantages of high efficiency and small size, switching power supplies are widely used in daily production and life. Generally speaking, in order to obtain a relatively stable output voltage, capacitors must be used to effectively filter out high-frequency noise. After the converter works for a period of time, the capacitance (Capacitance, C) and equivalent series resistance (Equivalent Series Resistance, ESR) of the capacitor will change. Compared with the initial capacitance value C and resistance value ESR, when the change is large , it can be considered that the capacitor has failed, and the failure of the capacitor will cause the operation failure of the power supply and the system. Buck, Boost, and Buc...

Claims

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Application Information

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IPC IPC(8): H02M3/155G01R27/02G01R27/26
CPCH02M3/155G01R27/02G01R27/2605
Inventor 韩旭芝姚凯杨思文周世林曹诚
Owner NANJING UNIV OF SCI & TECH
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