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Non-linear control method for on-board charger PFC converter based on discrete energy function control

A vehicle charger, non-linear control technology, applied in the direction of irreversible AC power input conversion to DC power output, control/regulation system, output power conversion device, etc., can solve the problem of low bandwidth of PFC voltage loop and main circuit output The voltage is prone to overshoot or undershoot, slow dynamic response and other problems, to achieve the effect of solving the low bandwidth of the voltage loop, good sensitivity and steady-state output characteristics, and improving efficiency

Inactive Publication Date: 2019-09-24
NANJING UNIV OF SCI & TECH
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Problems solved by technology

The PFC voltage loop bandwidth of the traditional on-board charger is low, and there is a problem of slow dynamic response, and the output voltage of the main circuit is prone to overshoot or undershoot.

Method used

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  • Non-linear control method for on-board charger PFC converter based on discrete energy function control
  • Non-linear control method for on-board charger PFC converter based on discrete energy function control
  • Non-linear control method for on-board charger PFC converter based on discrete energy function control

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Embodiment

[0072] figure 1 The main circuit topology of the first embodiment is shown, and the connection relationship following the above technical solution is shown.

[0073] figure 2 A functional block diagram of the first embodiment is shown, following the connection relationship of the above-mentioned technical solutions.

[0074] The input current detection circuit samples the input current i of the single-phase interleaved parallel Boost PFC in (t), the voltage detection circuit detects the input voltage v of the interleaved parallel Boost PFC in (t) and the output voltage v o (t), input the above value into the DSP control chip TMS320F28335.

[0075] according to Figure 4 As shown, the following calculations are completed in the control chip, and the input voltage v after sampling the single-phase rectifier bridge in (k) and input current i in (k), put v in (k) Multiplied by the input current after voltage division to obtain the instantaneous sampling input power p in ...

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Abstract

The invention discloses a non-linear control method for an on-board charger PFC converter based on discrete energy function control, which includes the steps of sampling input voltage and current, detecting peak input power, and synthesizing a load reference value and an input power reference value according to the peak input power; building a discrete state space model of an interleaved parallel PFC Boost converter according to the Euler discretization method; and designing a discrete energy function controller of the interleaved parallel PFC Boost converter system according to the discrete energy function minimization control method. The invention proposes an algorithm based on the discrete energy function control, which effectively solves the problem of slow dynamic response of PFC under the original control algorithm. In addition, the non-linear control method simplifies the design of the converter, improves the control effect of the system and has good flexibility and steady-state output characteristics.

Description

technical field [0001] The invention relates to a power factor correction technology of an electric energy conversion device, in particular to a nonlinear control method of a PFC converter of an on-board charger based on discrete energy function control. Background technique [0002] As a switching power supply charger, the on-board charger can realize the charging of electric vehicles. The research on it is mainly on charging technology and high-power switching power supply, while the research on high-power switching power supply is mainly on current sharing technology, PFC technology and soft switching technology. The traditional on-board charger PFC circuit adopts Boost circuit, which has problems such as large loss of switching devices and poor reliability, and cannot meet the requirements of high power and low ripple of electric vehicle chargers, and the improved design of PFC is reducing the harmonic current content. At the same time, the safety of the on-board charge...

Claims

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Application Information

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IPC IPC(8): H02M7/02H02M3/156
CPCH02M3/156H02M7/02
Inventor 吕广强梁凯歌赵仲祥
Owner NANJING UNIV OF SCI & TECH
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