Shenzhen Core Electronics Co., Ltd.

Shenzhen Core Electronics Co., Ltd.

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Vehicle charger scheme


  On board Charger is a vehicular AC/DC power supply, the municipal AC220V AC power, through OBC, converted into the electric power battery power required by electric vehicles, creating an independent R & D OBC program in 2016, which can provide a complete set of solutions used in: pure electric vehicles (BEV), increasing program electric vehicles (PHEV), Hybrid electric vehicle (HEV) at present mainly has the following two kinds of output voltage range: 200-420V, generally corresponding to passenger car, small logistics car, 400-680V, generally corresponding to commercial vehicles, large logistics vehicles, can provide 3.3KW 6.6KW solutions.
Off-board charger Off-board charger

Why do you stick to car grade devices

  • Design
    1. High reliability and high security of the device.
    2. Wide range of environmental adaptability;
    3. High power density and high efficiency.
  • Quality
    1. Extremely low adverse rate (PPM);
    2. To ensure long life;
    3. Traceability.
  • Cost and delivery
    1. The cost advantage after large volume;
    2. Delivery of stability, change management.

Principle sequence diagram

Principle sequence diagram

Principle description

1. DC/DC power supply 200 - 750Vdc voltage input, 14V- output, rated output power 800W-3000W. The power supply has the functions of input over-voltage protection, output short-circuit protection, output over-current protection, output over-voltage protection and over-temperature protection.

2. The power supply is a high power density DC-DC power supply. The power supply uses BOOST+LLC+ synchronous rectifier. The power supply is used at ambient temperature: -40 C - 70 C, +75 - +95 C, and can be reduced to 20%. The temperature of the power module reaches 105 degrees C /-5 degrees automatically.

3.The input uses four stage filter, BOOST boost circuit, BOOST power limit circuit, MOSFET use passive lossless absorption network, so that it works in soft switching mode with high efficiency. It can realize the switching of input over-voltage and under-voltage power, power failure alarm and other signals to realize the ability of switching with the sub-MCU, and can be reported to the background.

4. The rectifier has complete monitoring function and voltage circuit control function. It can report all kinds of information state through CAN communication. It has over voltage shutdown, fault shutdown, input fault, DC output fault, temperature alarm and other monitoring functions. It has the functions of software switch machine, PWMV adjust output voltage, PWMI current setting and so on. The power module adopts the average current sharing mode composed of discrete components. The current sharing range is less than 0.5V.

Scheme parameters

  • ModelParameter

  • Input voltage range200Vdc – 750Vdc

  • Power800W-4000W

  • Output voltage range18Vdc - 36Vdc

  • Efficiency >96% @ 100% load

  • TopologyCircuit topology PSFB/Interleaving Boost+LLC

  • CommunicationCAN communication

  • Protection gradeIP67

  • Heat dissipation mode The maximum water temperature is 75 degrees / air cooling, the highest ambient temperature is 85 degrees.

  • Altitude3KM

  • Design topology15 years /15000 hours

  • Terminal customer + modelGenerally assembled in commercial and minicar vehicles

Technical advantage

Technical advantage

1. Efficiency: above 95% ambient temperature 85 degrees without affecting efficiency.

2. Input pre charge circuit: effectively prevent input overshoot current and prevent open device misoperation.

3. Full bridge LLC resonance: LLC soft switching technology is adopted to effectively increase efficiency and reduce EMI. The efficiency of the whole machine is 95%, which meets EN55022 requirements.

4. Output Back-connection Protection Circuit: Effectively Prevent Charger Damage Caused by Back-connection, Cause Secondary Damage of Parts of Vehicle, Improve Safety Performance

5. Input measurement single chip:: input measuring single chip microcomputer detection input AC voltage, control AC input current accurately according to this voltage, prevent input current exceeding standard, cause damage of charging gun.

6. Output side single chip microcomputer: output single chip microcomputer detection output voltage, battery voltage, output current, accurate monitoring of the working state of the whole machine to prevent failure due to detection error.

7. Low voltage side SCM: low voltage side SCM realizes CC, CP S2, rechargeable gun temperature detection and other functions. The power supply is equipped with standby, dormant, external enabling, electromagnetic lock driving function, and expanded memory support diagnosis function.

8. High reliability: high integrated modular product + small volume.

9. The automotive MCU is used to realize the digital and analog control functions compatibly, and the automotive power supply is stable and safe with high performance-price ratio.