The DCDC Converter Circuit Design in Electrical Vehicle
The DCDC Converter Circuit Design in Electrical Vehicle
(2). Buck+ open loop interleaved LLC
1. DCDC Converter Design- spec
Input voltage： 210Vdc~410Vdc
Input voltage： 210Vdc~410Vdc
Output voltage： 14V1500W
Output voltage adjustable range: 12~16Vdc, PWM signal control
Regulation： ±1%
Start up overshoot： ± 5%
Transient response： 1ms，
0%~50%~0% 1000A/s
0%~100%~0% 1000A/S
Ripple： 200mV
Efficiency： 92%
Protection function： Input under voltage:
Automatic recover
Input over voltage: Automatic recover
Output under voltage: Automatic recover
Output over voltage: Latch
Over load/short circuit: Automatic recover
Over temperature: Automatic recover
Remote control: TTL level voltage
Fault alarm: OC alarm
Mechanical outline： 280mm×200mm×70mm
Weight： 3.6kg
Operation temperature： -40~85 ℃
Cooling： Water cooling ( water
temperature: 75℃)
(
water press is from 0.02Mpa)
EMC： CISPR 25, Level 4
Vibration： QC/T 413-2002 3.12, Not on the Engine in engine
cabinet
Protection： IP66
2. DCDC Converter Design- Circuit
2. DCDC Converter Design- Circuit
(1). EMI
stage:
Four common mode inductor: 2.1mH, R7K, T25X15X10, 1.2mm,
23T
(2). Buck+ open loop interleaved LLC
Buck: Mosfet: 20N60, Diode:R1560
Inductor: 2X56uH, CS234090, FeSiAl, 1.0mmX3, 20T
UC2843 IRS21834
Switching frequency: 100KHz
Switching frequency: 100KHz
(3). Open loop Interleaved LLC
Primary Mosfet: IRF38N20, Synchronous Rectifier: IRF3805
Lm: 18uH, Lr: 2.6uH, Cr:39nF
Lr: 2.6uH, PQ26, PC95, 0.25X3.5X4, 3T
Transformer: ER30, PC95, Primary 4OZ PCBX2,
5T
Secondary 0.2X4.5mm copperX6, 1T
Output Capacitor: 10uFx17
Switch frequency: 300kHz
(4). Auxiliary Power Supply
Transformer: EFD20,
PC40
Mosfet: 9R1K20
Control IC: UC2844
Switching frequency: 130KHz
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