Use the multimeter electric block to judge the damage of the inverter rectifier bridge. For the parallel rectifier bridge, loosen the connector and find the bad one. Portable Hotel Projector,home bedroom hotel projector,large banquet hotel projector Shenzhen Happybate Trading Co.,LTD , https://www.happybateprojectors.com
Analysis of the damage of the inverter rectifier bridge:
(1) The quality of the device itself is not good.
(2) The rear-stage circuit and the inverter power switching device are damaged, causing the rectifier bridge to flow through the short-circuit current and be damaged.
(3) The grid voltage is too high, and the grid encounters lightning strikes and overvoltage surges. The internal resistance of the power grid is small, and the overvoltage protection varistor has been burned and does not work, resulting in all overvoltage being applied to the rectifier bridge.
(4) The inverter and the power transformer of the power grid are too close, the impedance of the line in the middle is very small, the inverter does not have a DC reactor and an input side AC reactor, so that the rectifier bridge is under the impact state of high-amplitude sharp pulse current of capacitor filtering. , causing premature failure of the rectifier bridge.
(5) The input phase loss causes the load of the rectifier bridge to be aggravated and damaged.
Find the root cause of the damage of the rectifier bridge, and eliminate it, and prevent the new rectifier bridge from being damaged.
(1) Replace the new rectifier bridge, and ensure that the welding is reliable. Ensure the electrical safety distance from the surrounding components, and tighten with the screw to prevent the contact resistance from heating up. Conductive heat conduction with the heat sink requires silicone grease to reduce thermal resistance.
(2) For parallel rectifier bridges, use the same model and the same manufacturer's products to avoid current unevenness and damage.