Rectifier circuit faults and diode detection can be resolved using universal methods.

The root causes of rectifier circuit faults can be attributed to two aspects. Firstly, there are external factors that can cause damage to the rectifier diode, which are not inherent faults of the rectifier circuit itself. Secondly, rectifier diodes may have quality issues due to their high operating current, making them prone to malfunctions.

Rectifier diodes may experience two types of hard faults, namely open circuit and breakdown, as well as soft faults, such as an increase in forward resistance and a decrease in reverse resistance, resulting in poor stability.

When the forward resistance of the rectifier diode increases, the voltage drop at both ends of the diode terminals also increases, resulting in a decrease in the DC voltage applied to the load resistance of the rectifier circuit. This reduces the DC output voltage of the power circuit. As the working current of the rectifier increases, the voltage drop at both ends of the diode also increases, causing the rectifier diode itself to heat up. In severe cases, this may cause the rectifier diode to burn out.

When the reverse resistance of the rectifier diode decreases, the unidirectional conductivity of the diode deteriorates, allowing a portion of the AC voltage to pass through the rectifier diode and reach the load resistance of the rectifier circuit. As this is an AC voltage, it increases the ripple voltage in the DC voltage and increases the burden on the filtering circuit.