Apparatus and method for protecting an electrical circuit

Details Apparatus and method for protecting an electrical circuit Apparatus and method for protecting an electrical circuit

H - Electricity

02

H

318/120

H02H 3/50 (2006.01) H02H 7/08 (2006.01)

Patent

CA 1278029

Abstract of the Disclosure Apparatus and Method for Protecting An Electrical Circuit Motor control systems having solid-state components are commonly used on industrial vehicles such as lift trucks. Such solid-state components are easily damaged by excessive "ripple" voltages. The subject invention includes a power supply for supplying direct current to a motor circuit, wherein the direct current has a nominal direct current voltage value and as associated "ripple" voltage component. A pulse control circuit supplies current pulses from the power supply to a motor. A sensing device controllably produces a fault signal in response to the amplitude of the "ripple" voltage component exceeding a predetermined maximum value. An override circuit receives the fault signal and responsively modifies the current pulses delivered from the power supply to the associated motor.

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