It has two main functions: one is to change alternating current (AC) into direct current (DC), which is filtered and supplied to the load or inverter; Second, provide charging voltage for the battery. Therefore, it can also act as a charger.
When the stator coil induces alternating current, the current flows to the rectifier diode, and the anode begins to flow through the upper diode, while the lower diode cannot. After the voltage is output, it reaches the positive pole of the battery, then returns to the negative pole, returns to the rectifier diode through the negative pole of the generator, and finally returns to the negative pole of the stator coil. Formed a cycle.
Extended data:
The simplest rectifier type is diode rectifier. In its simplest form, the diode rectifier does not provide any means to control the output current and voltage value. In order to be suitable for industrial process, the output value must be controllable within a certain range. This control can be realized by applying the so-called mechanical on-load tap changer.
As a typical case, the on-load tap changer controls the input AC voltage of the primary side of the rectifier transformer, so the output DC value can also be controlled within a certain range. Usually, the on-load tap changer is used in combination with a saturable reactor connected in series with the rectifier output circuit.
By introducing DC current into the reactor, a variable impedance is generated in the line. Therefore, by controlling the voltage drop across the reactor, the output value can be controlled in a relatively narrow range.
References:
Baidu encyclopedia-rectifier