Single-phase gasoline generator control circuit

Circuit working principle: The DC resistance of winding (1) in the picture is about 5 n, which is
the main winding of the generator. It outputs 220 V/50 Hz AC power during normal operation.
The DC resistance of winding (2) is about 5 n, which is the auxiliary winding of the generator . During normal operation, it outputs
an AC voltage of about 100 V, which is controlled rectified by the thyristor vT to provide the excitation current required for normal power generation
. The DC resistance of winding (3) is about 12 n, which is an additional power generation winding. When
the gasoline engine starts, it outputs an AC voltage of about 11 V, which is half-wave rectified by the diode VDs
to provide the starting excitation current to the excitation winding (4). The DC resistance of winding (4) is about
10 n, which is the generator excitation winding . The stability of the generator output voltage is
achieved by controlling the size of the excitation current. The excitation current is provided by the thyristor VT2 after controllable rectification
. Its size is determined by the control angle of VTz, and the size of the control angle is determined by the phase of the trigger pulse
. The phase and output of the trigger pulse are controlled by the transistor VT,.
The frequency of the alternating current output by the generator is determined by the rotation speed of the gasoline engine. When the load of the generator
changes, the speed control system of the gasoline engine will automatically adjust the throttle to ensure that the generator can run at a stable speed when
the load changes, so that the output AC frequency is stable at 50 Hz.