Is the power grid extremely fragile during wartime? How to achieve millisecond level power-off protection for the main control board of the communication charging station?

core being hardware direct drive, bypassing MCU:

Testing process

• Isolation operational amplifier+high-speed comparator, voltage threshold 198V/253V, current threshold 110%

• Triggered when frequency offset>1Hz

• Response<100 μ s, without going through MCU

Execution phase

• Solid state relay (SSR) replaces mechanical contactor, turns off<10 μ s, no arc

• Hybrid solution: SSR rapid shutdown+contactor steady-state isolation, with a lifespan of millions of cycles

Level 3 redundancy

• Level 1: comparator+SSR,<100 μ s, to cope with sudden voltage changes

• Level 2: MCU software,<5ms, capable of handling overcurrent, temperature, and leakage current

• Level 3: Fuse,<10ms, to deal with short circuits

• Any level of action will result in a power outage and serve as a backup for each other

Main control board design

• Input terminal MOV+GDT+TVS three-level protection, EMP induced voltage clamping

• Auxiliary power supply with a wide range of 85-305V, Hold up capacitor maintains MCU>20ms

• All sampling channels are isolated by operational amplifiers, communication ports are magnetically isolated, and control signal optocouplers are driven

• Metal shielding shell, gap<3mm, cable 360 ° crimping, antenna with gas discharge tube

Software cooperation

• 10ms waveform buffer before fault, freeze and write to Flash after action

• Automatic recovery for voltage flicker<100ms; Drop>100ms, delay 30s, restart, three failed locks

• Island detection frequency drift rate, disconnect anti reverse power transmission within 2 seconds

The essential difference from civilian use

• Civilian: MCU software as the main component, 100ms-1s, mechanical contactor, equipment safety

• During wartime: hardware comparator as the main component,<1ms, SSR hybrid, equipment+personnel+power grid safety

in a word:

During wartime, millisecond level protection relies on hardware comparator direct drive SSR, and three-level redundancy ensures that any single point failure will not refuse to operate. The renovation of civilian boards requires the replacement of actuators, the addition of front-end comparators, and the strengthening of shielding, which doubles the cost but is a matter of life and death.

The main control board of the communication charging pile produced by Xincheng Technology is of high quality and good price. Welcome to inquire and purchase!