Patent ID: 9685942
Date: 2017-06-20
CPC Classifications: H03K

Claim:
1. A circuit arrangement for the protection of at least one component of a two wire electrical current loop, which is connected in series with a burden to an AC/DC electrical current source, wherein the two wire electrical current loop has a rectifier, a clock signal producer, and a switch, wherein the rectifier forms a DC circuit, wherein the switch is connected in the DC circuit, and wherein the clock signal producer outputs a clock signal to the switch for clocking the DC circuit, the circuit arrangement comprising: a first voltage source; at least one switch element; and a diode, wherein: the conduction direction of said diode points from the anode of said diode to the cathode of said diode; said cathode of said diode is connected to the DC circuit; said anode of said diode is supplied with a periodic or constant voltage from said first voltage source; the voltage is at least periodically greater than a predetermined threshold value; said at least one switch element serves to turn the clock signal on or off; and said at least one switch element passes or blocks the clock signal as a function of the result of a comparison between the voltage which said anode of said diode has, and the threshold value.