Abstract: A power supply apparatus includes an AC input port and a rectifier circuit, coupled to the AC input port, that produces a DC voltage at a rectifier circuit output from an AC input voltage at the AC input port. The apparatus further includes a selective harmonic current inducing circuit, coupled to the rectifier circuit output, that induces a harmonic component in a current delivered to a load from the rectifier circuit output. The selective harmonic current inducing circuit may control a phase and a magnitude of the induced harmonic current component in order to achieve selective suppression of a harmonic input current at the AC input port. The power supply apparatus may further include a filter circuit, coupled to the AC input port, that selectively suppresses a first harmonic current at the AC input port. The selective harmonic current inducing circuit may control the phase and magnitude of the induced harmonic current component such that a second harmonic current at the AC input port is suppressed.

Abstract: A power supply apparatus includes an AC input port, an output port, and a bypass circuit that couples the AC input port to the output port. An AC/DC converter circuit, e.g., a rectifier circuit, produces a DC voltage from an AC input voltage at the AC input port. A DC/AC converter circuit, e.g., a current mode controlled inverter, controls current transfer between the output port and the AC/DC converter circuit responsive to a control input such that respective first and second component currents of a current delivered to a load coupled to the output port pass via respective ones of the bypass circuit and the DC/AC converter circuit. The DC/AC converter circuit may be operated such that current passing through the bypass circuit is constrained to be substantially in phase with the AC input voltage.