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Design Method of Filter Circuit Parameters for Low Ripple Output Current PWM Current Converter

A current converter and filter circuit technology, which is applied in the field of precision servo drive systems, can solve problems such as the inability to quickly determine filter parameters and the difficulty in meeting high-precision current design indicators, and achieve efficient and practical design methods, high promotion and application value, and The effect of the resonance suppression of the circuit

Active Publication Date: 2022-03-18
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional filter circuit parameter design method is based on the filter theory, which leads to repeated trial and error when designing the filter parameters, and it is impossible to quickly determine the filter parameters, and it is difficult to meet the design indicators of high-precision current.

Method used

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  • Design Method of Filter Circuit Parameters for Low Ripple Output Current PWM Current Converter
  • Design Method of Filter Circuit Parameters for Low Ripple Output Current PWM Current Converter
  • Design Method of Filter Circuit Parameters for Low Ripple Output Current PWM Current Converter

Examples

Experimental program
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Effect test

Embodiment 1

[0043] see figure 1 , the power conversion main circuit of the PWM current converter is a single-phase full-bridge inverter circuit. Firstly, the DC bus voltage U of the single-phase full-bridge inverter circuit is given d , The switching frequency f of the power switching device c or switching frequency subharmonic angular frequency ω c =2πf c , load ripple current maximum allowable amplitude ΔI o , load inductance L o and load resistor R o . Then implement as follows:

[0044] Step 1: Build as image 3 The switching frequency subharmonic equivalent circuit is shown, which consists of an angular frequency ω c The switching frequency subharmonic power supply A series reactance ω c L s , a filter capacitance ω c C s , a damping resistor R s and an inductive load impedance Z o = R o +jω c L o Composition, where j is the imaginary unit, L s is the single-phase filter circuit inductance, C s is the capacitance of the single-phase filter circuit. Switching Fre...

Embodiment 2

[0055] see figure 2 , the power conversion main circuit of the PWM current converter is a three-phase full-bridge inverter circuit. First, the DC bus voltage U of the three-phase full-bridge inverter circuit is given d , The switching frequency f of the power switching device c or switching frequency subharmonic angular frequency ω c =2πf c , load ripple current maximum allowable amplitude ΔI o , a, b, c three-phase load inductance L oa , L ob , L oc and load resistor R oa , R ob , R oc , and then implement the following steps:

[0056] Step 1: Based on figure 2 The power conversion main circuit shown is a PWM current converter topology of a three-phase full-bridge inverter circuit, which is constructed as Figure 4 The three-phase switching frequency subharmonic equivalent circuit is shown, the equivalent circuit consists of the angular frequency ω c a, b, c three-phase switching frequency sub-harmonic power supply Three series reactance ω c L a , ω c L b ...

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Abstract

The invention discloses a filter circuit parameter design method of a low-ripple output current PWM current converter, constructs a switching frequency sub-harmonic equivalent circuit, and calculates the switching frequency sub-harmonic voltage amplitude and load of the parallel capacitor branch of the filter circuit Switching frequency sub-harmonic terminal voltage amplitude, select the current distribution coefficient between the switching frequency sub-harmonic current of the filter circuit parallel capacitor branch and the switching frequency sub-harmonic current of the inductive load branch, and calculate the filter circuit parallel capacitor branch Switching frequency sub-harmonic current amplitude, the inductive load branch is approximated as an open circuit, the filter parallel capacitor branch is approximated as a pure capacitor branch, the filter circuit inductance is calculated, and the electrical time constant and filter circuit parallel capacitor branch are calculated according to the formula The modulus of the switching frequency sub-harmonic impedance, the damping resistor and the filter capacitor, the invention realizes the effective suppression of the switching frequency sub-harmonic current on the load, and realizes the precise design of the filtering parameters.

Description

technical field [0001] The present invention relates to the technical field of high-precision and ultra-high-precision servo drive and the technical field of power electronic transformation and control, in particular to a method for designing filter circuit network parameters of a low-ripple output current PWM current converter, which is especially suitable for integrated circuit manufacturing, Precision servo drive system for high-end manufacturing equipment such as precision CNC machine tools and industrial robots. Background technique [0002] The servo system is an automatic control system that enables the output of the controlled object's position and state to reach a given value of the system. With the continuous improvement of the performance index requirements of the servo control system, the servo motor control technology is developing in the direction of digitization, intelligence and precision. In high-precision and ultra-high-precision servo control systems, mor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12
CPCH02M1/126
Inventor 张新华凌昊明崔国庆杨刘
Owner JIANGSU UNIV