MODULATION CIRCUIT AND METHOD

摘要

A modulation circuit (1) and a method for modulating a wireless power transfer circuit are provided. The modulation circuit (1) has a switching circuit (2) having a first state and a second state. The modulation circuit (1) also has a modulation mode in which the first state defines a normal state and the second state defines an operative state. In the operative state, the modulation circuit (1) modulates an electrical parameter (3) of the wireless power transfer circuit in a modulation direction. The modulation circuit (1) is configured to apply a trial modulation to the electrical parameter (3) to determine whether the modulation direction is a desired modulation direction. The modulation circuit (1) is also configured to apply a modulation translation if the modulation direction is not the desired modulation direction, with the modulation translation changing the modulation mode such that the modulation direction is the desired modulation direction. Undesirable and unpredictable variations in power output which are not favored by many loads are reduced.