How long does it take for the power distribution switching of the 14KW dual-gun AC charging pile motherboard to respond?

The power distribution switching response time of the 14kW dual-gun AC charging pile mainboard depends on the control hierarchy and load status, with typical values ranging between 100 milliseconds and 2 seconds. The hierarchical design ensures rapid response while maintaining equipment protection.

1. Hierarchical Definition of Response Time

• The physical switching time of the electrical layer transfer relay is 5-20 milliseconds, but load-switching generates an arc, which is prohibited in practice. A magnetic latching relay combined with a pre-charging circuit is used for zero-current switching, with a total delay of less than 100 milliseconds.

• The power layer adjusts the PWM duty cycle for stepless power regulation, with a digital control loop of 1-10 milliseconds, ensuring smooth power transitions without impact.

• The protocol layer negotiates OCPP Smart Charging command parsing, power redistribution between dual guns, and a software state machine with a response time of 50-200 milliseconds.

• User-perceived layer APP display updates and indicator feedback, <500 milliseconds, imperceptible to humans.

2. Typical Scenario Testing

• When the single gun insertion triggers the B gun insertion, the A gun reduces from 14kW to 7kW, and the B gun increases to 7kW. The total response time is <300 milliseconds, ensuring a seamless user experience.

• The power grid dispatch triggers the VPP to receive power limit commands, with stepwise power reduction from 14kW → 10kW → 7kW, each step lasting 100 milliseconds, achieving a total response time of <500 milliseconds, meeting the power grid's <30-second requirement.

• Fault protection triggers emergency derating for over-temperature/over-current, with the hardware comparator directly activating, cutting off the relay in <50 milliseconds, followed by software adjustment.

3. Key Design Considerations

• The load-carrying switching relay should only close when loaded and open when unloaded, with power regulation achieved via PWM, ensuring a relay lifespan exceeding 100,000 cycles.

• Before switching the precharge circuit, the DC-DC soft start reaches the target voltage, suppressing the surge current to <10A.

• The state machine executes power command changes only when the variation exceeds 10% and lasts for more than 100 milliseconds, preventing false triggers due to grid fluctuations.

4. One-Sentence Summary

• The 14kW dual-gun power distribution switching system features an electrical layer response time of <100 milliseconds and a protocol layer response time of <500 milliseconds, meeting real-time requirements. The core design combines relay zero-current switching, PWM stepless power regulation, and state machine debounce, achieving both fast response and long lifespan.

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