Methods and circuits for balancing current in a transformer are disclosed herein. An embodiment of the method includes sensing the magnitude and direction of current flow through the primary side of the transformer. The magnitude of current flowing in a first direction is compared to the magnitude of current flowing in a second direction through the primary side of the transformer. An AC signal driving the primary side of the transformer is adjusted so that the current flow in the first direction is substantially the same as current flow in the second direction.