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2024年3月25日发(作者：c语言从入门到精通光盘)
外文原文
Principle, Modeling and Control of DC-DC
Convertors for EV
ZHAN G Cheng-ning , SUN Feng-chun , ZHAN G Wang
(School of Vehicle and Transportation Engineering , Beijing Institute of
Technology , Beijing 100081)
Abstract :
DC-DC convertors can convert the EV
’
s high-voltage
DC power supply into the lowvoltage DC power supply. In order to
design an excellent convertor one must be guided by theory of
automatic control. The principle and the method of design, modeling
and control for DC-DC convertors of EV are introduced. The method
of the system-response to a unit step-function input and the
frequency-response method are applied to researching the convertor’
s mat- hematics model and control characteristic. Experiments
show that the designed DC-DC convertor’s output voltage precision
is high , the antijamming ability is strong and the adjustable
performance is fast and smooth.
Key words
: EV ; DC-DC convertors ; automatic control ;
mathematics model ; Bode drawing
CLC number
: U 469-72
Document code
: A
Generally there are two power supplies in EV. One is the DC
high-voltage power supply that is used by high power devices such as
traction motors and air conditioners etc. The other is the DC
low-voltage power supply that is usually used in some control circuit
and low-voltage electrical devices such as the inst- rument and
lighting. It s rating voltage is 24 V or 12 V. The low-voltage power
supply can be gained from the high-voltage power supply by a
DC-DC conver-
tor.
In this paper, the main performance of the designed convertor is
that the input voltage range is from DC 250 V to DC 450 V , the
output voltage is DC 24 V , the maximum output current is DC 20 A ,
and the output precision is 1 %.
1 Principle of the Convertor
1.1 The Block Diagram of the DC-DC Convertor
The block diagram of the DC-DC convertor is showed in Fig. 1.
The battery series provide the DC high-voltage input Us. The
low-voltage output of the con-
vertor is Uo. The setting value Ui of the convertor is equal to or is in
proportion to the demanded output voltage Uo. The convertor is a
closed-loop negative feedback-system with voltage feedback.
1.2 Power Switch Circuit
The power switch circuit with semi-bridge mode is showed in
Fig. 2. L1 and C1 constitute an input filter to avoid high-frequency
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