Drive system for induction motor

A drive system for induction motor, comprising a two-phase induction motor, a power source filter circuit, an H-bridge power drive circuit and a controller MCU,

• wherein the power source filter circuit is configured to filter out harmonic components of a Direct Current (DC) power source, and generate a power source midpoint voltage required for driving;
• the controller MCU is configured to generate a switch control signal required for operation of the H-bridge power drive circuit;
• the H-bridge power drive circuit is configured to generate a drive current and transfer the drive current to the two-phase induction motor;
• the H-bridge power drive circuit comprises an H bridge consisting of a power semiconductor transistor Q1, a power semiconductor transistor Q2, a power semiconductor transistor Q3 and a power semiconductor transistor Q4;
• a drain of the power semiconductor transistor Q1 is connected to an output of the DC power source, a source of the power semiconductor transistor Q1 is connected to a drain of the power semiconductor transistor Q3 to form a bridge arm endpoint U, a source of the power semiconductor transistor Q3 is connected to ground, and a gate of the power semiconductor transistor Q1 and a gate of the power semiconductor transistor Q3 are connected respectively to the controller MCU, a drain of the power semiconductor transistor Q2 is connected to the output of the DC power source, a source of the power semiconductor transistor Q2 is connected to a drain of the power semiconductor transistor Q4 to form a bridge arm endpoint V, a source of the power semiconductor transistor Q4 is connected to the ground, and a gate of the power semiconductor transistor Q2 and a gate of the power semiconductor transistor Q4 are connected respectively to the controller MCU;
• one endpoint of a winding L1 of the two-phase induction motor is connected to one endpoint of another winding L2 of the two-phase induction motor to form a middle point;
• the middle point of the two phase windings is connected to the middle point of a capacitor C0 and a capacitor C1;
• the capacitor C0 and the capacitor C1 are configured to filter out the current harmonics of the DC power source, and form the middle point of the DC power source;
• an endpoint of the winding L1 is connected to the bridge arm endpoint U and an endpoint of the winding L2 is connected to the bridge arm endpoint V;
• and
• the two-phase induction motor is thus configured to receive the drive current generated by the H-bridge power drive circuit.