What are the manifestations after the rectifier bridge is damaged?
2 Answers
After the rectifier bridge is damaged, the entire circuit will fail to operate, unable to rectify, resulting in no DC input in the circuit. If the diode is broken down, it may cause a short circuit. The function of the rectifier bridge is to convert AC power into DC power. Damage and causes of the rectifier bridge module: Damage to the rectifier module is usually caused by grid voltage or internal short circuits. If internal short circuits are ruled out, replace the rectifier bridge. Damage to the inverter module is usually caused by motor or cable damage and drive circuit failure. No display upon power-on is usually caused by damage to the switching power supply or soft charging circuit, resulting in no DC power in the DC circuit. Display of overvoltage or undervoltage is usually caused by input phase loss, circuit aging, or circuit board moisture. Display of overcurrent or ground short circuit is usually caused by damage to the current detection circuit, such as Hall elements, operational amplifier circuits, etc. Power and drive board startup display overcurrent is usually caused by damage to the drive circuit or inverter module. Normal output voltage under no-load, but display of overload or overcurrent under load is usually caused by improper parameter settings or aging of the drive circuit, with module damage triggering the overcurrent protection function.
If the rectifier bridge fails, the car's symptoms are quite noticeable. The alternator hums loudly, sounding like a tractor, and the battery light on the dashboard shines glaringly. The most frustrating part is that the battery won't charge—after a highway drive, the car won't start once turned off, and jump-starting it three or four times doesn’t help. The headlights flicker, and the air conditioner's fan speed is unstable. Last time, this happened when I was driving an old Jetta. At first, I thought it was a battery issue, but after dismantling the alternator, I found the diodes in the rectifier bridge were burnt black, as if the entire car's electrical system had collapsed. Fixing it isn’t too expensive, but delaying repairs can ruin the battery as well.
