High and low frequency ripple current suppression method in electric vehicle in-vehicle single-phase charging system

A charging system and electric vehicle technology, applied in the direction of electric vehicle charging technology, electric vehicles, charging stations, etc., can solve the problem of not considering the high frequency current ripple of the auxiliary battery, so as to suppress the low frequency/secondary ripple current, reduce the The effect of cost and vehicle space, good friendliness

Active Publication Date: 2019-11-12
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the above-mentioned integrated secondary ripple suppression methods, the auxiliary battery charging converter plays a key role, but thes

Method used

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  • High and low frequency ripple current suppression method in electric vehicle in-vehicle single-phase charging system
  • High and low frequency ripple current suppression method in electric vehicle in-vehicle single-phase charging system
  • High and low frequency ripple current suppression method in electric vehicle in-vehicle single-phase charging system

Examples

Experimental program
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Example Embodiment

[0032] Example 1

[0033] (1) Topological structure

[0034] In the on-board charging system of electric vehicles, by rationally designing the charging topology for the auxiliary battery, high-frequency ripple current suppression during auxiliary battery (low-voltage battery) charging and low frequency during single-phase PWM rectification charging of power battery (high-voltage battery) can be realized. Suppression of ripple current. The structure of power and auxiliary battery charging system is as figure 1 Shown.

[0035] figure 1 Among them, the power battery charger is composed of a single-phase PWM rectifier and a DC / DC converter. It works in parking charging mode, and the power flow path is shown by the dotted arrow. The single-phase AC power supply u s And the input filter inductor L S Connect one end to the power switch Q r2 The source of the power switch Q r3 Connected to the drain; inductance L S The other end of the power switch Q r1 The source of the power switch Q r4 C...

Example Embodiment

[0067] Example 2

[0068] Below figure 1 The structure diagram of the power and auxiliary battery charging system in the electric vehicle on-board charging system shown, figure 2 with Figure 4 The topology equivalent circuit diagram and image 3 with Figure 5 The principle and method of the present invention are explained by the main characteristic waveforms when the topology is stable in operation. The following describes the suppression of high-frequency ripple current when the power battery charges the low-voltage auxiliary battery and the suppression of the low-frequency ripple current when the power battery is charged with single-phase PWM rectification by the power grid.

[0069] 1. The principle and method of suppressing high frequency ripple current of auxiliary battery charging during driving

[0070] The duty cycle of the drive signal of all the power switches of the converter is fixed, which is 0.5. The power switch Q 1 -Q 6 The driving signal is S 1 -S 6 , The drive si...

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Abstract

The invention discloses a high and low frequency ripple current suppression method in an electric vehicle in-vehicle single-phase charging system. The high and low frequency ripple current suppressionmethod in the electric vehicle in-vehicle single-phase charging system comprises the following steps: an electric vehicle in-vehicle single-phase charging system consisting of a power battery chargerand an auxiliary battery charger is constructed; the auxiliary battery charger is composed of a multi-function and isolated DC/DC converter; in a driving charging mode, a two-phase staggered parallellow-voltage side topological structure is constructed based on a Buck-Boost basic conversion unit in the auxiliary battery charger, zero output of current ripple is achieved through phase shifting by180 degrees between the basic units, and meanwhile, the low-voltage side topological structure can realize high-frequency rectification; the high-voltage side topological structure realizes the high-frequency inversion through the charge and discharge of an energy-storage capacitor and the cooperation of a power switch based on the Buck-Boost basic conversion unit; and in a parking charging mode,the active energy filtering of the capacitive energy storage type is realized by a high-voltage side bidirectional Buck-Boost unit in an isolated charging topology of the auxiliary battery, so as toachieve the charge and discharge of the energy-storage capacitor, and achieve the purpose of suppressing the secondary ripple voltage.

Description

technical field [0001] The invention relates to the field of topology and control technology of power electronics technology, in particular to a high- and low-frequency ripple current suppression method based on a single-phase PWM (pulse width modulation) rectification and charging system mounted on an electric vehicle. Background technique [0002] In recent years, with the rapid development of industry and economy in the world, the demand for fossil energy has increased rapidly, resulting in increasingly serious problems such as energy shortage and environmental pollution. Therefore, it has become an international norm to vigorously develop clean energy, promote energy transformation, and achieve sustainable green development. New energy vehicles use renewable energy instead of fossil fuels as the energy source, which is one of the effective ways to solve the problems of energy shortage and environmental pollution. Electric vehicles are an important part of the new energy...

Claims

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Application Information

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IPC IPC(8): H02J7/02H02M1/15H02M3/335H02M3/158B60L53/20
CPCH02M1/15H02M3/33576H02M3/1582H02M3/1584B60L53/20H02M3/1586Y02T10/70Y02T90/14Y02T10/7072
Inventor 张云方剑
Owner TIANJIN UNIV
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