Eliminates high-order harmonic inverter circuit design

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The inverter has a wide range of applications, such as high conversion efficiency, fast start-up, and good safety performance. The following is a design of a thyristor step wave inverter. The main circuit of this circuit is simple, and the output waveform is close to a sine wave, which can better eliminate higher harmonics.

The inverter design circuit diagram is shown in the figure below. The six taps of the transformer T of the circuit are connected with the unidirectional thyristors VS1~VS6 to form the main circuit of the thyristor inverter.

Figure: Simple circuit diagram for eliminating high-order harmonic inverter design

Under the action of the trigger control circuit, the operation procedure of the circuit is as follows: let the thyristor vS1 turn on 30° first, then let VS2 turn on 30°, then let VS3 turn on 60°. During this period, each thyristor relies on the induced voltage generated by the transformer winding. Shut down. After VS3 is turned off, let VS2 turn on 30°, then force VS2 to turn off, then let VS1 turn on 30°, and end the output of the half-cycle step wave. The lower half cycle is rotated by the thyristors VS6, VS5, and VS4 like the upper half cycle to obtain the output of the second half cycle wave. The main circuit of this circuit is simple, and the output waveform is close to a sine wave, which can better eliminate higher harmonics.