Direct current balancing using a zero voltage detection signal

A system comprising:

• a transformer circuit;
• a first transistor coupled to the transformer circuit;
• first zero voltage detection circuitry coupled to the first transistor;
• a second transistor coupled to the transformer circuit;
• second zero voltage detection circuitry coupled to the second transistor;
• and
• a controller coupled to the first transistor, the first zero voltage detection circuitry, the second transistor, and the second zero voltage detection circuitry,
• wherein the controller is operable to control the first transistor and the second transistor based on a mismatch between a first signal received from the first zero voltage detection circuitry and a second signal received from the second zero voltage detection circuitry.

A system comprising:

• a transformer;
• a first transistor coupled to the transformer;
• a second transistor coupled to the transformer;
• first zero voltage detection circuitry operable to output a pulse based on a drain to source voltage of the first transistor being negative when the first transistor turns on;
• second zero voltage detection circuitry operable to output a pulse based on a drain-to-source voltage of the second transistor being negative when the second transistor turns on;
• and
• a controller coupled to the first zero voltage detection circuitry and the second zero voltage detection circuitry, wherein the controller is operable to mitigate direct current content in an alternative current applied to the transformer based on at least one of a first count of pulses from the first zero voltage detection circuitry or a second count of pulses from the second zero voltage detection circuitry.