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Abstract

A circuit for optimizing power transferred from an inverter circuit to a motor, the circuit using an open loop method to start-up the motor and have it reach a minimum speed, each phase of the motor receiving voltage from the inverter circuit. The circuit including at least one phase detector circuit for sensing the sign of one or more currents, the sign of the current being used to detect a zero crossing of the current; an interpolator for receiving a voltage reference and outputting a frequency reference and a phase shift reference, the phase shift reference being a difference between an imposed voltage modulation and the one or more currents; and a regulator circuit for using an error between the phase shift reference and the sign of the one or more currents to calculate a phase shift compensation, wherein the sign of the one or more currents is determined to be positive at first sign transition instances when a sinusoidal wave of the current crosses to a positive area and to be negative at second sign transition instances when a sinusoidal wave of the current crosses to a negative area, the first and second sign transition instances being used to detect a phase shift of the current versus the imposed voltage modulation.

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First Claim