Power monitoring
First Claim
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1. 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.
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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.
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Citations
16 Claims
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1. Monitoring apparatus for monitoring power exchanged with electrical apparatus comprising:
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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. - View Dependent Claims (2, 3, 4)
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5. Power monitoring apparatus comprising:
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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. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification