The present disclosure relates to a monitoring assembly for monitoring a supply signal of an electrically operated component, wherein the monitoring assembly comprises a monitoring circuit and a control and evaluation unit assigned to the monitoring circuit. At least one galvanically isolated connection is provided between the monitoring circuit and the control and evaluation unit. The monitoring circuit includes at least one threshold-dependent component which generates a current signal as a function of an applied supply voltage. The supply voltage is an AC voltage. The at least one threshold-dependent component is configured so as to generate a current signal when the supply voltage is above a first threshold value. The control and evaluation unit is set up to evaluate the at least one transmitted output signal to determine a fault condition. The control and evaluation unit is set up to output a drive signal when the fault condition has been determined. A system is furthermore described.

The present disclosure relates to a monitoring assembly for monitoring a supply signal of an electrically operated component, wherein the monitoring assembly comprises a monitoring circuit and a control and evaluation unit assigned to the monitoring circuit. At least one galvanically isolated connection is provided between the monitoring circuit and the control and evaluation unit. The monitoring circuit includes at least one threshold-dependent component which generates a current signal as a function of an applied supply voltage. The supply voltage is an AC voltage. The at least one threshold-dependent component is configured so as to generate a current signal when the supply voltage is above a first threshold value. The control and evaluation unit is set up to evaluate the at least one transmitted output signal to determine a fault condition. The control and evaluation unit is set up to output a drive signal when the fault condition has been determined. A system is furthermore described.

The invention relates to a power supply unit for the provision of at least one switchable power output, having at least one power input U.sub.IN, at least one voltage measuring device that monitors the voltage at the at least one power input U.sub.IN, wherein, if the input voltage falls below a defined threshold U.sub.thres or if the change in the input voltage U.sub.IN per unit of time rises above a defined threshold U.sub.thres/t, the power output/power outputs is/are switched off and the input voltage is then measured at a first timepoint t.sub.1, and, after a first predetermined time (t.sub.d1) (S240), the input voltage U is measured again at a second timepoint t.sub.2, and if the input voltage at the second timepoint is greater than the input voltage at the first timepoint, it is assumed that a short circuit is present at at least one power output.

The invention relates to a power supply unit for the provision of at least one switchable power output, having at least one power input U.sub.IN, at least one voltage measuring device that monitors the voltage at the at least one power input U.sub.IN, wherein, if the input voltage falls below a defined threshold U.sub.thres or if the change in the input voltage U.sub.IN per unit of time rises above a defined threshold U.sub.thres/t, the power output/power outputs is/are switched off and the input voltage is then measured at a first timepoint t.sub.1, and, after a first predetermined time (t.sub.d1) (S240), the input voltage U is measured again at a second timepoint t.sub.2, and if the input voltage at the second timepoint is greater than the input voltage at the first timepoint, it is assumed that a short circuit is present at at least one power output.

A power controller makes use of a line-voltage detection method to perform brown-out protection and brown-in mechanism. The power controller has a high-voltage node connected via a current-limiting resistor to a line voltage, and a high-voltage startup transistor connected to the high-voltage node. The input voltage at the high-voltage node is divided to provide a fraction result. An offset current flowing through the high-voltage startup transistor and the current-limiting resistor is provided in response to the fraction result. The offset current is stopped in response to the fraction result when the offset current flows through the high-voltage startup transistor and the current-limiting resistor.

A power controller makes use of a line-voltage detection method to perform brown-out protection and brown-in mechanism. The power controller has a high-voltage node connected via a current-limiting resistor to a line voltage, and a high-voltage startup transistor connected to the high-voltage node. The input voltage at the high-voltage node is divided to provide a fraction result. An offset current flowing through the high-voltage startup transistor and the current-limiting resistor is provided in response to the fraction result. The offset current is stopped in response to the fraction result when the offset current flows through the high-voltage startup transistor and the current-limiting resistor.

Power switch devices and methods are provided where an undervoltage event in a supply voltage is detected. Information regarding the undervoltage event is stored in a memory element. The memory element is supplied by a control signal.

Power switch devices and methods are provided where an undervoltage event in a supply voltage is detected. Information regarding the undervoltage event is stored in a memory element. The memory element is supplied by a control signal.

A resonant converter includes a first switch on the primary side and a second switch coupled to the first switch, a synchronization rectification switch on a secondary side configured to conduct during a conduction period in response to a switching operation of the first switch, and a switch control circuit configured to determine an operating region of the resonant converter to be below resonance based on a result of a comparison between the conduction period and an on period of the first switch.

A resonant converter includes a first switch on the primary side and a second switch coupled to the first switch, a synchronization rectification switch on a secondary side configured to conduct during a conduction period in response to a switching operation of the first switch, and a switch control circuit configured to determine an operating region of the resonant converter to be below resonance based on a result of a comparison between the conduction period and an on period of the first switch.