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An Integrated EV charger and Driver System: Topology and Control

IP.com Disclosure Number: IPCOM000245878D
Publication Date: 2016-Apr-15
Document File: 4 page(s) / 95K

Publishing Venue

The IP.com Prior Art Database

Related People

XiaoBo Yang: AUTHOR [+2]

Abstract

This technology discussed proposed an integrated EV charger and EV driver system, which utilizes the same power stages for EV charging and EV motor driving. The proposed structure and control could save one set of power converters, which could save the EV motor manufacture companies' driving and charging system cost.

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An integrated EV charger and driver system: Topology and Control

LIN MA, XIAOBO YANG This technology discussed proposed an integrated EV charger and EV driver system, which utilizes the same power stages for EV charging and EV motor driving. The proposed structure and control could save one set of power converters, which could save the EV motor manufacture companies' driving and charging system cost.

1 BACKGROUND

With the energy capacity of battery is growing and cost decreasing, the electrical vehicles industry is blooming during last few years. Accordingly, more and more EV chargers appeared on EV charger market.

Fig.1 shows the typical structure of EV driving and EV charging system. It could be found that, two similar power conversion stages are utilized (in BULE dot blocks).

Usually, the on board EV charger also utilizes one similar mini power converter stage as the EV driving and EV charging system as shown in Fig.2 and patent [1].

Which means, the system has three similar functional power converter facilities:

Battery

(DC/DC)

(DC/AC)

Motor

Battery <--- %EV% (DC/DC) <--- (DC/AC) <--- AC Grid

Battery <--- (DC/DC) <--- (DC/AC) %EV% <--- AC Grid

More power stage means the power control is more flexible, but which also means the system cost increasing.

ABSTRACT



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DC Charging Plug

Non-isolated

Converter

Battery

DC

DC

CU

DC

AC

CU

PMSM

EV

AC Charging Plug

On board

Charger

DC Charging Plug

Isolated

Rectifier

DC

DC

CU

DC

AC

CU

AC filter

Grid

DC Charging Pole

AC Charging Plug

AC Charging Pole

Meter and

Switch

Grid

Figure 1: On-board EV charger Power module

Figure 2: On-board EV charger Power module

2 PROPOSED TOPOLOGY AND CONTROL

This technology discussed proposed an integrated EV charger and driver system as Fig.3 shows. Compared with the traditional EV charging and EV driver system, the proposed structure utilizes an interlock switch to shift the Charger and Motor connection. Meanwhile, in order to simplify and unify the converter control, a virtual impedance control algorithm is proposed.

a. As Fig. 3 shows, the novel EV charger is based on the EV motor driver, which means the motor driver converter is NOT to make any changes;

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b. An interlock switch is added on EV motor circuit and Charger circuit, in order to avoid the power flow influence and decouple the two systems;

c. An AC output filter is needed, which...