Patent ID: 9750109
Date: 2017-08-29
CPC Classifications: G01R,H02H,H05B

Claim:
1. An electrical circuit for detection of a short circuit or overvoltage or both condition(s) of a load, comprising: a power source delivering a gapped electrical power supply which is a regulated current that is time-modulated such that the electrical power is supplied intermittently in a first time interval of constant current amplitude whereas no electrical current is supplied in a second time interval following the first interval, terminals for said load between which the short circuit or overvoltage or both condition(s) are to be detected, a disabling element connected to at least one of said terminals to disable said load, a monitoring circuit connected to monitor a voltage or current magnitude at least one of said terminals to detect the short circuit or overvoltage or both condition(s), said monitoring circuit comprising a maximum or minimum value detector to deliver a maximum or minimum value of said voltage or current magnitude over a time at least longer than the second time interval in the power supply, such that said monitoring circuit is disposed to monitor said maximum or minimum value over the time to detect the short circuit or overvoltage or both condition(s), and wherein said monitoring circuit is connected to activate said disabling element when the short circuit or overvoltage or both condition(s) are detected.