What are the common faults of power inverter

During the use of power inverters, power connection problems are one of the most common faults. This fault usually manifests itself as the inverter being unable to receive DC input normally. Possible reasons include loose input power cord plug, poor contact, or internal power cord disconnection. For this problem, the inspection and repair process is relatively simple. Users only need to carefully check the connection between the input power cord plug and the socket to ensure that the plug is fully inserted. If the plug is connected normally, the resistance at both ends of the power cord can be measured with the resistance range of the multimeter to determine whether there is a circuit break. If the measured resistance value is infinite, it means that the power cord is damaged and a new power cord needs to be replaced in time to restore normal function.

In addition, fuse blowing is also one of the common faults of power inverters. As an important protection component of the internal circuit of the inverter, the fuse will quickly blow when abnormal conditions such as short circuit and overload occur inside the inverter, thereby cutting off the circuit to protect other components of the inverter from damage. In the case that the inverter cannot work normally, if it is confirmed that the input power connection is normal, it is necessary to check whether the fuse has blown. When replacing a fuse, be sure to choose a product with the same specifications as the original fuse, including parameters such as rated current and rated voltage. In addition, before replacing the fuse, check whether there is a short circuit or overload fault inside the inverter to avoid the fuse blowing again after replacement.

The power switch of the power inverter may also fail. After long-term use, the contacts of the power switch may wear or oxidize, causing the switch to fail to conduct normally. For power switch failures, users can use the on-off position of the multimeter to measure the conduction condition of the two ends of the switch. If the switch is in the on state but the multimeter shows an open circuit, it means that the switch is damaged and needs to be replaced.

Internal circuit failure is a more complex type of failure in power inverters. Components on the printed circuit board (PCB) inside the inverter, such as resistors, capacitors, diodes, transistors, etc., may be damaged due to aging, overheating or overvoltage, which in turn affects the normal operation of the circuit. The inspection and repair of such failures usually require professional electronic equipment and repair technology. Maintenance personnel usually use professional testing equipment such as oscilloscopes and logic analyzers to conduct detailed inspections of the circuit to find damaged components and replace them.

In addition to the above faults, power inverters may also encounter problems such as large input voltage fluctuations, frequent load changes and out-of-range, and filter capacitor damage during use. Large input voltage fluctuations may cause the inverter output voltage to be unstable, while frequent load changes and out-of-range may cause output voltage fluctuations. The main function of the filter capacitor is to smooth the output voltage and reduce the ripple component in the voltage. If the filter capacitor has problems such as bulging, leakage, or decreased capacity, the ripple of the output voltage will increase, which is manifested as voltage instability. In response to these problems, users should take measures to stabilize the input voltage, arrange the load reasonably, and replace the filter capacitor when necessary to ensure the stable operation of the inverter.