Power inverter with overload protection apparatus

Details Power inverter with overload protection apparatus Power inverter with overload protection apparatus

1983-04-01

1985-07-02

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 94, 361 24, 363 51, H02H 7122, H02H 504

Patent

active

045272140

ABSTRACT:
A power inverter including a converter unit for rectifying AC power into DC power, an inverter for inverting the DC power into AC power for driving a load apparatus, and a protection apparatus for protecting the load apparatus from being overloaded. The load protecting apparatus comprises current detecting means for detecting a current supplied to the inverter unit from the converter unit, a memory for storing a thermally limited operation time characteristic determined in consideration of cooling effect proper to the load apparatus, and an abnormality detecting circuit for producing an abnormality signal to stop the operation of the inverter unit when an accumulated value calculated on the basis of the current value detected by the current detector at a predetermined sampling interval exceeds the characteristic value previously stored in the memory. The load apparatus can be positively protected from overload notwithstanding variations in the output voltage and the output frequency of the power inverter.

REFERENCES:
patent: 3526809 (1970-09-01), Ogenhaus
patent: 3646396 (1972-02-01), Fischer
patent: 4139885 (1979-02-01), Overzet et al.
patent: 4158163 (1979-06-01), Eriksen et al.
patent: 4240149 (1980-12-01), Fletcher et al.
patent: 4291355 (1981-09-01), Dinger
"Digital Programmable Time-Parameter Relay Offers Vers. and Acc.", IEEE Trans. on Power App. and Systems, vol. PAS-99, No. 1, Schweitzer, Jan./Feb. 1980.

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