Back to results
US 5,930,092 AGranted
Power monitoring
AssigneeLoad Controls Incorporated
InventorRobert W. Nystrom
Life of this patent
Estimating the term…
Abstract
The electrical power to a device, such as a pump, is monitored by multiplying a current signal with a voltage signal to provide a power signal. Typically when the power signal is outside a predetermined range, power to the device is interrupted.
Claims16
Monitoring apparatus for monitoring power exchanged with electrical apparatus comprising:
- at least first and second conductors connected to said electrical apparatus,
- a multiplier having a current input coupled to at least one of said conductors for receiving a current signal representative of the current carried thereby, a voltage input coupled to said at least one conductor for receiving a voltage signal representative of the voltage between said first and second conductors and a power output for providing a power signal representative of the product of said current and voltage signal,
- and trip circuitry coupled to said power output for providing a trip signal only when said power signal is outside a predetermined range,
- and further including absolute value circuitry for providing an absolute value signal representative of the absolute value of said power signal.
1 more element
Power monitoring apparatus comprising:
- a transformer;
- a Hall cell having a current input for receiving a current signal, a voltage input for receiving a voltage signal from said transformer, and a power output for providing an output power signal representative of the product of said current signal and said voltage signal;
- and
- a rectifier circuit coupled to said transformer for providing D.C. power,
- and further comprising a distortion-reducing impedance network intercoupling said transformer, said voltage input and said rectifier circuit.
2 more elements
Dependencies are inferred from the claim text.