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A Predictive Current Sampling Method in PFC Control

A technology for predicting current and current loop, applied in electrical components, high-efficiency power electronic conversion, output power conversion devices, etc., can solve the problems of PFC current loop control accuracy, unfavorable current loop stability, and reduce current harmonic distortion rate, etc., to achieve Low performance requirements, prevention of triangular wave cycle delay, and accurate sampling prediction

Active Publication Date: 2021-07-09
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, PFC control is widely implemented by digital control. In digital control, the average current value is generally required for PFC average current control, and the average current sampling will inevitably have hysteresis problems, and the hysteresis of current sampling will reduce the accuracy of PFC control current. The current harmonic distortion (THD) also has a great influence. The delay in the control loop will have a negative impact on the control accuracy of the PFC current loop and the stability of the current loop. In order to solve this problem, it is necessary to consider the use of prediction methods for delay compensate

Method used

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  • A Predictive Current Sampling Method in PFC Control
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  • A Predictive Current Sampling Method in PFC Control

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Embodiment

[0035] Such as figure 1 As shown in the attached figure, i ref Indicates the reference signal of the current loop, i L Indicates the PFC input current, G i (z) is a discrete current loop controller, PWM receives the carrier signal u output by the current loop controller d (z) Perform pulse width modulation (PWM) with the modulated triangular wave signal to obtain a duty cycle, thereby controlling the switch tube in the PFC hardware circuit.

[0036] Such as figure 2 as shown, figure 2 In order to sample the PFC input inductor current and then calculate the timing diagram for PWM output, the curve ① in the figure is the triangle wave modulation signal of PWM generated inside the digital signal processor (DSP) or single-chip microcomputer (MCU) in digital control; ② is The output of the current loop controller in PFC control belongs to the carrier signal; ③ is to output a high level according to the carrier is greater than the triangular wave signal, otherwise it outputs ...

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Abstract

The invention relates to a method for predicting current sampling in PFC control, comprising the following steps: 1) constructing a PFC current predictive compensation control model; 2) using the predicted sampling inductance current for compensation to complete the PFC current loop control. Compared with the prior art, the invention has the advantages of improving waveform output, sampling accuracy, increasing PFC current gain and the like.

Description

technical field [0001] The invention relates to the field of active power factor correction (PFC), in particular to a predictive current sampling method in PFC control. Background technique [0002] With the development of power electronics technology, a large number of non-linear loads are connected to the grid to generate a large number of harmonic current components, causing pollution to the grid. In order to improve the power factor of the power supply line, there is power factor correction (PFC) technology, which is widely used in uninterruptible power supply (USP), frequency converter and other equipment and cooperates with the back-stage inverter to make nonlinear The load is equivalent to a pure resistance, which means that the input of the power supply is resistive. Active power factor adjustment is to control the input current based on the AC input voltage, so that the input current can track the waveform and phase of the mains voltage, reduce the THD of the input...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/42H02M1/12
CPCH02M1/12H02M1/4208H02M1/0009H02M1/0012Y02B70/10
Inventor 龙英文安小雪陆善婷
Owner SHANGHAI UNIV OF ENG SCI