Optimal control of variable on-time of crm boost pfc converter

A technology of on-time and optimized control, applied in high-efficiency power electronic conversion, output power conversion device, climate sustainability, etc., can solve problems such as reducing computational complexity and system cost

Active Publication Date: 2019-04-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to solve the problem of v in greater than or less than V o / 2 These two cases need to be calculated separately for the complex calculation problems, and an optimized control method that can be realized by an analog control circuit or a digital controller is proposed. This method does not need to perform power detection and measurement of the effective value of the input voltage. Under any condition within the working range of the CRM boost PFC converter, the switch tube conduction time T on (t) The operation process is consistent, thereby reducing the operation complexity and system cost

Method used

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  • Optimal control of variable on-time of crm boost pfc converter

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Effect test

Embodiment 1

[0056] The optimal control of the change conduction time of the CRM step-up PFC converter of the present invention, under any condition within the working range of the CRM step-up PFC converter, the conduction time T of the switch tube on The operation process of (t) is consistent. Through the optimized control, the complexity of the entire control system can be reduced on the basis of reducing the input current THD of the CRM step-up PFC converter, thereby reducing the system cost. The optimal control adopted is based on the principle that the average current of the inductor in the CRM step-up PFC converter is equal to the sinusoidal reference current, and since the inductor current changes linearly in a switching cycle except for a very short resonance time, it can be The inductor current waveform is approximated as a triangle (see figure 2 ) to simplify the calculation of the average inductor current.

[0057] The optimized control of the CRM step-up PFC converter of the...

Embodiment 2

[0107] Embodiment 2: Based on the TMS320F28335 digital controller, realize the unified digital control method of the on-time operation optimization of the variable on-time control of the CRM Boost PFC converter

[0108] figure 1 It is the main circuit of CRM step-up PFC converter, including EMI filter, rectifier bridge, input capacitor, boost inductor, switch tube, diode, output capacitor and load. The circuit parameters of the CRM step-up PFC converter used in the example are: boost inductance L=230uH, parasitic capacitance C of the power device oss +C dp =80pF. The test conditions are: line frequency 50Hz, AC input voltage 110V and 220V, output bus voltage 400V, full load output power 200W. This example tests the input current THD against constant on-time control at 20%, 40%, 50%, 60%, 80% and 100% load respectively.

[0109] image 3 In order to realize the digital control circuit diagram of optimized unified control, in addition to the main circuit, a voltage sampling...

Embodiment 3

[0126] Embodiment 3: Realize the optimization and unification of the on-time operation of the variable on-time control of the CRM step-up PFC converter through analog circuit control

[0127] figure 1 It is the main circuit of CRM step-up PFC converter, including EMI filter, rectifier bridge, input capacitor, boost inductor, switch tube, diode, output capacitor and load. The circuit parameters of the CRM step-up PFC converter used in the example are: boost inductance L=230μH, parasitic capacitance C of the power device oss +C dp =80pF, the gain coefficient K of the multiplier M is 0.1 / V. The test conditions are: line frequency 50Hz, AC input voltage 110V and 220V, output bus voltage 400V, full load output power 200W.

[0128] Figure 5 Using the analog control method to realize the optimized and unified schematic diagram of the on-time operation of the variable on-time control of the CRM step-up PFC converter, including the voltage sampling circuit, the inductor current z...

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Abstract

The invention discloses the optimization control of the changing conduction time of the CRM step-up PFC converter, which can realize the unification of the changing conduction time in the case of wide input voltage and variable load, and avoids the need to control V in the traditional method. in greater than or less than V o / 2 The complexity of classification control in two different situations. The invention adjusts the conduction time of the switching tube in real time to reduce the distortion of the input current by sampling the instantaneous values ​​of the input and output voltages, and through corresponding real-time calculation or signal conditioning. The constant part of the conduction time is adjusted by the voltage PI loop, and the variable part is calculated by the digital controller according to a unified algorithm or adjusted in real time by peripheral circuits such as analog dividers. The invention does not need to detect the output power and the effective value of the input voltage, and does not need the input voltage phase-locked circuit, and realizes the change conduction time control of the converter under any condition within the working range through a normalized control method, thereby greatly simplifying the circuit cost and Control difficulty.

Description

technical field [0001] The invention relates to the power converter technology, in particular to an optimization control applied to the change conduction time of a CRM step-up PFC converter. Background technique [0002] The wide application of power electronic devices has brought a lot of harmonic pollution to the power grid, seriously affecting the power supply quality of the power grid and the normal operation of other electrical equipment. In order to reduce the harmonic pollution caused by power electronic devices and meet the harmonic standard IEC61000-3-2 formulated by the International Electrotechnical Commission, it is necessary to use power factor correction (Power FactorCorrection, PFC) converters to suppress harmonic components so that various electrical equipment achieve the required harmonic standards. Among them, the CRM step-up PFC converter is widely used due to its high power factor, small size, light weight and low cost. [0003] The variable conduction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/42H02M1/12
CPCH02M1/12H02M1/4225H02M1/0012Y02B70/10
Inventor 任小永吴羽郭哲辉陈乾宏张之梁
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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