Vehicle Power Supply-Shenzhen VAPEL Power Supply Technology Co.,Ltd.

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4.5kW Vehicle-Mounted DC/DC Power Supply

This product operates within an input voltage range of 400–800 Vdc, delivering a rated output of 27.8 Vdc/4500 W (peak power 5000 W). It features integrated system cooling, input overvoltage/undervoltage alarm and protection, output overcurrent alarm and protection, output overvoltage protection, output short-circuit protection, overtemperature protection, and CAN communication functionality. Suitable for various new energy vehicles including pure electric and range-extended models.

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Technical Specifications

Project	Minimum	Typical	Maximum	Unit	Conditions
Environmental Conditions
Operating Temperature	-40	-	85	℃	The software detects PCB temperatures exceeding 110°C. For every 1°C increase in temperature, the output current decreases by 8.2A. Over-temperature protection activates at 120°C and resumes operation once the temperature drops back to 110°C.
Storage temperature	-40	-	105	℃
Relative humidity	5	-	95	%
Elevation	0	-	3000	m
Heat dissipation method	System Integration
Input Characteristics
Rated Input Voltage	540			Vdc	The input end features reverse polarity protection;
Input Voltage Range	400		800	Vdc	When the input voltage exceeds 750V, the output power is reduced to 4000W.
Maximum Input Current	-	-	13	A	400Vdc Input, fully loaded.
Static leakage current	-	-	1	mA	Rated input, tested with power off
Output Characteristics
Rated Output Voltage	27.8			Vdc
Output voltage setting	27.8±0.3			Vdc	Rated input and output at half load.
Output Current Range	0	-	162	A
Maximum Output Current	162			A	400–750 Long-term maximum operating current
Output rated power	4500			W
Peak Output Power	5000			W	Maximum operating time: 6 minutes
Overall efficiency	95	96	-	%	At ambient temperature, rated input, output at full load
Temperature coefficient	-	-	±0.02	%/℃
Output ripple and noise	-		600	mVp-p	Rated input, minimum load 5A output. Oscilloscope bandwidth should be 20MHz. Probe connected in parallel with 10μF capacitor and 104 ohm resistor.
Boot-up time	-	-	3	S	Power supply input startup time
Output rise time	-	-	500	ms	Power supply input startup time
Voltage Regulation Accuracy	-	-	±1	%	Minimum output load: 5A
Static leakage current	-	-	2	mA	Leakage current when the output terminals are connected in parallel to a 24Vdc battery without being connected to high-voltage power supply or 24Vdc control power.
Output voltage backflow	Support			/	Apply a reverse voltage of 50V for one minute; the DC-DC converter remains undamaged.
Control Method	ID_KEY Control / CAN Control / EN Control			/	Reserve CAN wake-up functionality; see Note 3 for details.
Dynamic Response Voltage Overshoot Magnitude	-	-	±15	%	Load variation: 30% to 80% to 30%, load change rate ≤ 0.1 A/μs, dynamic load variation frequency: 50 Hz to 5 kHz.
Input continuous power on/off	Support			/	Under normal control signal input and output conditions, the input can withstand five consecutive on-off cycles within one minute without causing power supply failure or damage.

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