Safety switching device with a safe power supply unit
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United States of America Patent
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Mar 20, 2018
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app pub date -
Jul 30, 2015
filing date -
Feb 1, 2013
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Abstract
A safety switching device for an automated installation includes a power supply unit for providing at least one operating voltage for the device. The power supply unit receives an input voltage via a feed line and provides a defined output voltage on an output side. Electrical supply to the power supply unit is interrupted if an instantaneous output voltage is higher than the defined output voltage. The interruption is achieved by first and second switching elements arranged in series and connecting the input of the power supply unit to ground, and by an interrupter element in the feed line. The interrupter element triggers when both the first and the second switching elements are in a closed, low-impedance state. A reference point between the first and the second switching elements has a voltage value that corresponds to a first expectation value when the first switching element is in the closed, low-impedance state and the second switching element is in an open state, and corresponds to a second expectation value when the first switching element is in the open state and the second switching element is in the closed, low-impedance state.
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