Exposure to the sun is scorching! How can the main control board of a 14KW dual-gun AC charging pile withstand 40℃?

The core points of the 14KW dual-gun AC charging pile's main control board enduring 40℃ exposure:

Hardware Selection

• Choose a capacitor with a temperature rating of 105℃ for 5000 hours or a long-life model rated at 125℃

• The relay contacts are silver-plated and are used at a reduced rating

• The sampling resistor utilizes a metal film with a low temperature coefficient (±25ppm/℃)

thermal design

• Compulsory air cooling is required, with intelligent fan speed regulation (not activated only at high temperatures)

• Relays and power modules are arranged near the edge of the chassis air duct

• PCB large-area copper foil via hole heat dissipation

Software temperature control

• Reduce power at 55℃, further reduce at 65℃, and shut down at 75℃

• Adjust the PWM duty cycle of the CP line, and the OBC will automatically reduce the current and continue charging

• The relay base is equipped with an NTC direct-measurement contact temperature sensor, which forces disconnection when the temperature exceeds 80℃

Operation and maintenance key points

• Clean the fan filter monthly (blockage by willow catkins is the main reason in summer)

• Infrared temperature scanning to identify hot spots, and checking whether the three-phase current is balanced

• Preventive replacement of capacitors and relays every 3 years

Core principles:

• It's better to reduce power in advance than to burn the motherboard afterwards.

• The temperature control strategy is conservative to ensure reliable operation in summer.

The AC charging pile main control board produced by XinCheng Technology is of high quality and competitive price. Welcome to inquire and purchase!