A leakage current detection and interruption device includes a switch module for controlling electrical connection of power supply lines between input and output ends; a leakage current detection module, including first and second leakage current detection lines respectively covering the first and second power supply lines, to detect leakage current thereon and to generate respective first and second leakage signals in response thereto; a signal processing module, coupled to the leakage current detection module to receive the first and/or second leakage signals and to generate a leakage fault signal in response thereto; and a trigger module, coupled to the switch module and the signal processing module, to receive the leakage fault signal and in response thereto, to drive the switch module to disconnect the electrical connection to the output end. The device can detect current leaks on the two power supply lines and is simple, low-cost and reliable.

This specification relates to fault current limiter (FCL). More particularly, to solve problems of protecting and designing current limiting impedance in a protective coordination system, as limitations of the related art, the fault current limiter may measure heat capacity of a current limiting impedance unit by detecting fault current flowing to the current limiting impedance unit and limiting the fault current flowing to the current limiting impedance unit according to the measured heat capacity, which may result in preventing the current limiting impedance unit from being damaged due to the fault current, preventing an extended accident due to the damaged current limiting impedance unit and enabling a stabilized system and line protection.

A power interrupting device has: an output terminal connected to a load; interruption circuits connected in parallel between a power source and the output terminal; and a control device controlling each interruption circuit. Each interruption circuit has: a switch element connected between the power source and an intermediate node, and ON/OFF controlled by an interruption signal output from the control device; and a rectifier connected such that a forward direction thereof is from the intermediate node to the output terminal. The control device sets the interruption circuits as a diagnosis target circuit in turn. The control device sets the interruption signal output to each interruption circuit such that the switch element of the diagnosis target circuit is OFF. Moreover, the control device determines, based on a voltage of the intermediate node of the diagnosis target circuit, whether an abnormality occurs in the diagnosis target circuit.

An electronic circuit arrangement for current limitation in a load circuit includes a power semiconductor located between a supply voltage and a load, wherein the control input of the power semiconductor is connected to the output of a controller stage and a switching contact of a circuit breaker, where a shunt resistor is inserted into the load and the voltage occurring there increases the voltage potential at the control input of the circuit breaker, a current source is also connected to the control input of the circuit breaker, where the current source generates a bias voltage at the control input of the circuit breaker via a series resistor, and where the current source has a negative temperature coefficient.

A leakage current detection and interruption device includes a switch module for controlling electrical connection of power supply lines between input and output ends; a leakage current detection module, including first and second leakage current detection lines respectively covering the first and second power supply lines, to detect leakage current thereon and to generate respective first and second leakage signals in response thereto; a signal processing module, coupled to the leakage current detection module to receive the first and/or second leakage signals and to generate a leakage fault signal in response thereto; and a trigger module, coupled to the switch module and the signal processing module, to receive the leakage fault signal and in response thereto, to drive the switch module to disconnect the electrical connection to the output end. The device can detect current leaks on the two power supply lines and is simple, low-cost and reliable.

A power management integrated circuit includes an internal output transistor connected to an external voltage input line, to which an external voltage is supplied, and outputting an internal output voltage, a self-overvoltage protection circuit detecting whether the external voltage exceeds a breakdown condition for the internal output transistor and providing a gate voltage to a gate terminal of the internal output transistor and a clamp circuit outputting, as the internal output voltage, a first clamp voltage having a uniform level in a first overvoltage clamp mode and a second clamp voltage, which is leveled down from the external voltage, in a second overvoltage clamp mode. When the internal output transistor is turned off, the clamp circuit outputs the internal output voltage. The external voltage in the second overvoltage clamp mode may be greater than the external voltage in the first overvoltage clamp mode.

An over current protection circuit and an over current protection method thereof are provided. The over current protection method includes: generating a reference current curve; detecting an operation current of an electronic device; calculating a first average slope of the reference current curve and a second average slope of a variation curve of the operation current; and determining whether to activate an over current protection mechanism by comparing the first average slope and the second average slope during an over current detection mechanism.

The present disclosure provides a solid state breaker and a power supply system. The breaker includes: a first port and a second port configured to connect a first external system; a third port and a fourth port configured to connect a second external system; a first electronic switch connected between the first port and the third port; a second electronic switch connected between the second port and the fourth port; and a control unit configured to control the first electronic switch and the second electronic switch to be turned off in a case of detecting an electricity leakage occurs in the second external system. The breaker is provided with electronic switches at both poles, so that it can provide effective protection for the human body by quickly turning off the electronic switches provided at both poles, in a case of an electricity leakage of the prosumer to the ground.

A leakage detection and interruption device includes a switch module to control power connection between input and output terminals of a power line; a leakage detection module to generates a leakage fault signal when the leakage current on the power line exceeds a threshold; a power module, including a first current limiting element, coupled in series between the power line and the leakage detection module, to supply power to the leakage detection module; the driving module includes a electromagnetic coil and a switching semiconductor device, to drive the switching module to disconnect the power connection in response to a leakage fault signal. The first end of the first current limiting element is coupled to the power line, and the second end is coupled to the first end of the switching semiconductor device through at least one first diode and/or second current limiting element.

According to embodiments of the present disclosure, there is provided an apparatus and method for protecting a solid-state circuit breaker. The apparatus comprises: a temperature detection unit configured to detect a case temperature of each transient voltage suppressor in one or more transient voltage suppressors; and a control unit configured to: receive the case temperature of one or more transient voltage suppressors from the temperature detection unit; for each of the one or more transient voltage suppressors, predict a junction temperature of each of the one or more transient voltage suppressors after the first switching device and the second switching device are switched from an on state to an off state, based on the case temperature before the first switching device and the second switching device are switched from the on state to the off state; and in response to the junction temperature of at least one transient voltage suppressor of the one or more transient voltage suppressors exceeding a predetermined temperature threshold, generate a first alarm signal.