Square D Company

Eaton Power Quality Corporation

Julius Rice

Roger Alan Plemmons

John Gaylord Tracy

Frederick Tassitino, Jr

Rennie Bobb

Hans Pfitzer

A closed loop power converter circuit of a UPS or other power supply includes a pulse width modulator circuit in a forward path of the closed loop power circuit. A compensation circuit provides pulse width commands to the pulse width modulator at a first rate. A feedback circuit digitally filters samples of an output of the closed loop power converter at a second rate greater the first rate and that provides the filtered samples to the compensation circuit. In some embodiments, the compensation circuit may be operative to compensate for the phase lag associated with a low pass output filter.

PWM power supplies using controlled feedback timing and methods of operating same

A method of rapidly dissipating energy from a contactor controlled by a switching device, the steps comprising: operably connecting a metal oxide varistor to the switching device; interrupting electrical current to the contactor; absorbing energy from the contactor; and, limiting the amount of voltage across the switching device.

Method of dissipating energy from a contactor coil

Method and apparatus for immunizing a contactor circuit from the adverse effects of a derived power supply

A method for providing electrical current to a contactor circuit, by providing a power supply circuit having a power supply resistor, the power supply circuit supplies electrical current to the contactor circuit in response to the electrical specifications of the contactor; selecting a value for the power supply resistor in response to the contactor's electrical specifications and requirements of the contactor circuit; and, inserting the selected power supply resistor into the power supply circuit.

Method of providing electrical current to a contactor circuit

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Raleigh, NC, United States of America

Julius Rice