Half-wave rectifier filter circuit is a kind of circuit that filters AC electrical signals through rectification. The circuit obtains DC voltage by half-wave rectification of AC electric signal (only retaining its positive half-wave) and filter filtering. This circuit can be used for applications that output DC voltage, such as DC motor driving and rechargeable batteries.

Half-wave rectifier and filter circuit usually consists of half-wave rectifier and filter. Half-wave rectifier usually uses diode or triode to realize half-wave rectification. Filters usually use capacitors for filtering.

There will be some losses when the circuit is filtered, for example, the high-frequency part will be filtered out, and the low-frequency part may still fluctuate to some extent. In addition, the diode will generate heat in the process of circuit operation, which needs heat dissipation.

In general, higher quality DC voltage can be obtained by combining with other types of rectifier circuits (such as full-wave rectifier circuits and three-phase rectifier circuits).