Patent ID: 6118680
Filing Date: 2000-09-12
Classification: G06F,H02M

Abstract:
For use with a system for supplying AC power to a load via a bus, the system developing a bus voltage on the bus and including first and second inverters, the first and second inverters being connected in parallel and operating at substantially the same frequency, a control circuit associated with the first inverter for reducing cross conduction current between the first and second inverters, the control circuit comprising:a phase detector for developing a difference signal proportional to a difference between an input signal representative of an output current of the first inverter and a reference signal;a filter cooperating with the phase detector for smoothing and sampling the difference signal; anda signal generating circuit for adjusting the phase of an output voltage of the first inverter, the phase of the output voltage being dependent upon the difference signal, the signal generating circuit developing the reference signal, the reference signal being substantially representative of the output voltage of the first inverter but approximately 90 degrees out of phase with the output voltage, wherein the phase detector, the filter, and the signal generating circuit cooperate to match the phase of the output voltage of the first inverter to the phase of the output voltage of the second inverter to thereby reduce cross conduction current flowing between the first and second inverters.