Inverter circuit with switch circuit having two transistors operating alternatively

An inverter circuit, comprising:

• a direct current input terminal connected to a direct current power supply;
• a first switch circuit comprising a first transistor and a second transistor;
• a second switch circuit comprising a third transistor and a fourth transistor, wherein source electrodes of the first, second, third and fourth transistors are grounded, a drain electrode of the third transistor is connected to a drain electrode of the first transistor, and a drain electrode of the fourth transistor is connected to a drain electrode of the second transistor;
• a first transformer comprising a first primary winding, a second primary winding, and a secondary winding configured for outputting an alternating current voltage, wherein the first primary winding and the second primary winding share a first tap, the first tap is connected to the direct current input terminal, the other tap of the first primary winding is connected to the drain electrode of the first transistor, and the other tap of the second primary winding is connected to the drain electrode of the second transistor;
• a first filter circuit connected between the first tap and ground;
• a second transformer comprising a third primary winding, a fourth primary winding, and a secondary winding configured for outputting an alternating current voltage, wherein the third primary winding and the fourth primary winding share a second tap, the second tap is connected to the direct current input terminal, the other tap of the third primary winding is connected to the drain electrode of the first transistor, and the other tap of the fourth primary winding is connected to the drain electrode of the second transistor;
• a second filter circuit connected between the second tap and ground;
• and
• a pulse width modulation circuit comprising a first output port configured for outputting a first square wave signal to turn on or turn off the first transistor and the third transistor and a second output port configured for outputting a second square wave signal to turn on or turn off the second transistor and the fourth transistor, wherein gate electrodes of the first and the third transistors are connected to the first output port, and gate electrodes of the second and the fourth transistors are connected to the second output port;
• wherein phases of the first square wave signal and the second square wave signal are opposite;
• when the first square wave signal is a high level and the second square wave signal is a low level, a first current path is formed sequentially through the direct current input terminal, a first parallel circuit formed by the first primary winding and the third primary winding, a second parallel circuit formed by the first transistor and the third transistor, and ground;
• and
• when the first square wave signal is a low level and the second square wave signal is a high level, a second current path is formed sequentially through the direct current input terminal, a third parallel circuit formed by the second primary winding and the fourth primary winding, a fourth parallel circuit formed by the second transistor and the fourth transistor, and ground.