一． System diagram
2 DCDC high voltage terminals are connected in parallel to form HVDC busbar, DC supporting capacitor is configured, 2 DCDC low voltage terminals are connected to battery pack, and low voltage pre charge system is configured between battery pack and DCDC.
DCDC parameter
|
number
|
category
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Detailed
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Specifications
|
|
1
|
DC voltage
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High voltage side DC voltage（V）
|
0-800Vdc (Can be set up)
|
|
|
|
Low voltage DC voltage（V）
|
0Vdc—Input side DC voltage (Can be set up)
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2
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DC current
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High voltage DC current（A）
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<=200A
|
|
|
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Low voltage DC current（A）
|
rated 200A
|
|
3
|
conversion efficiency
|
Enter 600V, output 300V
|
95%
|
|
4
|
Maximum variable ratio
|
High voltage voltage: low voltage voltage
|
10:1
|
|
5
|
Rated power
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Output power (output voltage 400V)
|
Rated 40KW, maximum power 80KW
|
|
6
|
communication interface
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RS485，Full isolation
|
Modbus,RTU Agreement
|
|
|
|
CAN2.0A/B，Full isolation
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Highest 1M/S
|
|
7
|
Precharging system
(selection)
|
Before the battery is connected to the DCDC, the DCDC input capacitor is prefilled to protect the battery package, and it has anti back connection function. When necessary, the DCDC and battery pack can be separated from the battery.
|
|
8
|
Display interface
|
High power DC/DC products, only provide communication interface, do not provide display module
|
|
9
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Static current ripple
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Not greater than ±2A（1%）
|
|
10
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size
|
390*370*270（mm）（Length * width * height）
|
|
11
|
weight
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30KG
|
二． Functional description
1., after the battery pack is properly connected to DCDC, the pre charge system starts to work. After pre charge is completed, the battery pack is connected to the DCDC low-voltage terminal. If the polarity of the battery pack is reversed, the battery pack and the DCDC will be separated from the pre charge system.
2. the upper computer connects 2 sets of DCDC through RS485 or CAN, and can control 2 DCDC to charge or discharge respectively.
3., the charge is constant current and constant voltage two stage charging. Once the high voltage is lower than the set value of high voltage and constant voltage, DCDC automatically reduces the charging current, and maintains the voltage of the high voltage busbar, which is not too low. When the high voltage is above the high voltage and constant voltage, it will charge normally according to the set constant current and constant voltage.
4., the discharge is constant current discharge. As long as the high voltage is lower than the high voltage and constant voltage, it will discharge according to the constant current value. If the high voltage rises to the constant voltage value, DCDC will reduce the discharge current, maintain the high voltage near the constant voltage value, and stop the discharge when the discharge is set to the under voltage value.
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