The present invention discloses a short-circuit-protection electronic switch serial connect to the load, which is applied to the load control in a DC or AC power supply occasion. With load over-current and short-circuit-protection function, it is characterized in that the primary switch component is a part of the cut-off-type positive feedback protective trigger circuit, the primary switch component and the positive feedback gate element form a cut-off-type positive feedback protective trigger circuit. It can be widely applied to directly turn-on and turn-off control of all kinds of serial connection AC or DC load devices phase angle control and PWM control fields.

A power distribution system 100 is installed in an aircraft, and comprises: a first DC power supply unit 10 including a generator 11; a second DC power source unit 20 including a battery 30, a step-up/down converter 41, a voltage sensor 43, and control unit 44; and a diode 50. When the voltage sensor 43 does not detect regenerative power, the control unit 44 executes a running power processing mode in which generated power generated by the first DC power supply unit 10 is supplied to an electric actuator 80 while charging and discharging the battery 30 using the step-up/down converter 41 so as to keep a charge rate A of the battery 30 within a predetermined range. When the voltage sensor 43 detects regenerative power, the control unit 44 executes a regenerative power processing mode in which the battery 30 is charged with the regenerative power using the step-up/down converter 41.

A power distribution module including: a power line connecting between a battery and a load; a main relay connected to the power line; an active fuse connected to the power line on the battery side relative to the main relay; a first voltage converter connected to the power line on the load side relative to the main relay; an abnormality detection unit configured to detect an abnormality of the power line; and a first driving/control wiring extending from the first voltage converter and connected to the active fuse, wherein a first control unit mounted on the first voltage converter transmits a control signal for disconnecting the active fuse when the abnormality detection unit detects an abnormality of the power line, and the active fuse is disconnected.

A device for measuring a current of a three-phase inverter according to an embodiment of the present invention comprises: a current detection element connected to the lower end of one of three lower switches comprising an inverter; a current measurement unit for measuring a current by using the current detection element and the other two lower switches, to which the current detection element is not connected; and a current correction unit for correcting a second current value and a third current value measured using the two lower switches, on the basis of the relationship between a first current value measured using the current detection element and the second and third current values.

A direct current circuit breaker comprises a mechanical relay in a first supply line configured to conduct electrical current during steady-state operation and an auxiliary relay assembly in parallel with the mechanical relay to define an auxiliary breaker path for conducting electrical current during transient operation of the circuit breaker. The auxiliary relay assembly comprises a power-semiconductor circuit configured for selective current conduction and for bidirectional current blocking when in a non-conductive state. There is also a controller configured to (i) activate the power-semiconductor circuit to conduct in response to a command signal to stop transfer of the electrical power, in order to provide a zero voltage condition under which the mechanical relay is to deactivate; (ii) deactivate the mechanical relay when current is being conducted through the auxiliary breaker path; and (iii) deactivate the power-semiconductor circuit after the mechanical relay is deactivated to stop the transfer of the power.

An electronic fuse for a power supply includes at least two switching elements and a regulation unit, wherein a first switching element is arranged in a main branch, where the regulation unit is switches off the first switching element when a predetermined threshold value is exceeded by a prevailing current value, and a second switching element that is also actuated by the regulation unit, which is arranged in an auxiliary branch parallel to the first switching element and assumes a substantial proportion of a resulting power loss when an overload occurs, and the second switching element, which is arranged in at least one auxiliary branch, is configured or optimized for linear operation, and where the at least two switching elements are configured such that the line resistance of the second switching element is at least twice the line resistance of the first switching element.

An electronic fuse for a power supply includes at least two switching elements and a regulation unit, wherein a first switching element is arranged in a main branch, where the regulation unit is switches off the first switching element when a predetermined threshold value is exceeded by a prevailing current value, and a second switching element that is also actuated by the regulation unit, which is arranged in an auxiliary branch parallel to the first switching element and assumes a substantial proportion of a resulting power loss when an overload occurs, and the second switching element, which is arranged in at least one auxiliary branch, is configured or optimized for linear operation, and where the at least two switching elements are configured such that the line resistance of the second switching element is at least twice the line resistance of the first switching element.

Circuitry and techniques for providing a bidirectional switch in devices for overcurrent protection and voltage protection are disclosed herein. In one embodiment, a circuit may include a first reverse-blocking insulating gate bipolar transistor (IGBT), having a first gate terminal, first collector terminal and a first emitter terminal. The circuit may include a second reverse-blocking IGBT, having a second gate terminal, a second collector terminal, electrically coupled to the first emitter terminal, and a second emitter terminal, electrically coupled to the first collector terminal. As such the first IGBT and the second IGBT may define a first current path, extending from the first collector to the second emitter; and a switch control circuit, coupled to send a control signal to at least one of: the first gate terminal and the second gate terminal, during an overcurrent event.

A data storage device includes a power supply circuit configured to supply power to the data storage device. The power supply circuit includes a voltage clamp configured to operate in a conduction state in response to an over-voltage condition of the power supply circuit. The power supply circuit also includes a fuse in series with the voltage clamp. The fuse is configured to open in response to a current flow through the fuse and the voltage clamp exceeding a threshold value. The power supply circuit also includes a switching device that is configured to latch in a forward conduction mode in response to the voltage clamp operating in the conduction state. The switching device couples power from a positive voltage bus to the voltage clamp when the switching device is in the forward conduction mode.

A data storage device includes a power supply circuit configured to supply power to the data storage device. The power supply circuit includes a voltage clamp configured to operate in a conduction state in response to an over-voltage condition of the power supply circuit. The power supply circuit also includes a fuse in series with the voltage clamp. The fuse is configured to open in response to a current flow through the fuse and the voltage clamp exceeding a threshold value. The power supply circuit also includes a switching device that is configured to latch in a forward conduction mode in response to the voltage clamp operating in the conduction state. The switching device couples power from a positive voltage bus to the voltage clamp when the switching device is in the forward conduction mode.