An apparatus with load dump protection incorporates first and second half-bridge circuits, first and second comparators, and first and second clamping circuits. The first comparator compares a supply voltage with a first set voltage and generates a first comparison signal while the supply voltage exceeds the first set voltage. The second comparator compares the supply voltage with a second set voltage and generates a second comparison signal while the supply voltage exceeds the second set voltage. The first clamping circuit divides the supply voltage and provides a divided voltage to the first half-bridge circuit in response to the second comparison signal. The second clamping circuit divides the supply voltage and provides a divided voltage to the second half-bridge circuit in response to the second comparison signal.

A multi-power supply system and a control method thereof are disclosed. The multi-power supply system includes a first power-supply unit, a second power-supply unit, a switching unit, and a control unit. The power-supply unit comprises a reverse current prevention circuit, a converter circuit, and an input circuit. The switching unit is electrically coupled to the first power-supply unit and the second power-supply unit. When the first and second input circuits are in normal operation, the control unit controls the switching unit to be turned off to allow the first power-supply unit and the second power-supply unit to supply power to a load. When one of the first and second input circuits is in abnormal operation, the control unit controls the switching unit to be turned on. The switching unit cooperates with the first and second reverse current prevention circuits to achieve the switching of input.

A line-to-ground fault location detector detects, based on a difference between a current flowing from a power transmission circuit to a load circuit, and a current flowing from the load circuit to the power transmission circuit, whether a line-to-ground fault is occurring at a power-transmission-circuit side or a load-circuit side. A contactor controller opens a first contactor when the load circuit detects the occurrence of the line-to-ground fault, and when a line-to-ground fault location detector detects that a location of the line-to-ground fault is at the power-transmission-circuit side, the contactor controller maintains the open state of the first contactor even if an operation to instruct closing of the first contactor is made after the first contactor is opened.

A motor controller circuit includes an electrical powertrain having a three phase input, a DC link and a three phase output, a controller including a processor and a memory, a first current sensor configured to sense a current at the three phase input, a second current sensor configured to sense a current at the three phase output, and a third sensor configured to sense a current at the DC link, and wherein the memory stores instructions configured to cause the processor to compare an operational model of the powertrain against a mathematical model of the powertrain and to detect a high impedance fault when a deviation between the operational model and the mathematical model exceeds a threshold.

In some examples, an electrical power system includes a solid state power converter including a first set of switches on a source side of the solid state power converter and a second set of switches on a load side of the solid state power converter. The electrical power system also includes a power source connected to the source side of the solid state power converter and also includes a differential bus connected to the load side of the solid state power converter. The electrical power system further includes a controller configured to receive a first signal indicating a current at the source side and receive a second signal indicating a current at the load side. The controller is further configured to detect, based on a time derivative of the first signal and a time derivative of the second signal, a fault in the electrical power system.

A power converter monitor having built-in fault tolerance and containment including a plurality of voltage inputs operatively connected to a pulse timing device, a respective comparator electrically connected to each of the voltage inputs, an and-gate electrically connected in series to each of the comparators and wherein the pulse timing device is operatively connected by the and-gate and a-not gate to each of the voltage inputs configured to reset a detected voltage output fault and provide a converter inhibit pulse if the voltage output fault is detected.

A high-reliability multiphase power supply system and method. A second processing unit is configured with a first field-effect transistor, a drain electrode of the first field-effect transistor is connected to a power supply, a source electrode of the first field-effect transistor is connected to the drain electrode of a second field-effect transistor, the source electrode of the second field-effect transistor is connected to ground, and the gate electrodes of the first field-effect transistor and the second field-effect transistor are connected to a first processing unit; the second processing unit is configured with a first current detection module and a second current detection module, the first current detection module and the second current detection module are electrically connected to a bus unit, and the bus unit is electrically connected to a substrate management controller.

In recent years, an improvement in detection accuracy of an overcurrent is desired. An overcurrent detection device is provided, which includes a gate current detection unit that detects whether a gate current flowing to a semiconductor element is equal to or above a reference gate current; a sense current detection unit that detects whether a sense current flowing through a sense-emitter terminal of the semiconductor element is equal to or above a reference sense current; and an adjustment unit that decreases a detected value of the sense current relatively to the reference sense current if the gate current is equal to or above the reference gate current.

This invention discloses a power electronic converter that streamlines the detection, monitoring, and protection of ground faults. The converter has at least one DC leg with each having a DC port and a first DC bus, at least one AC leg with each having an AC port and a second DC bus, at least one DC-bus capacitor, a ground-fault detection unit, and a Protective Earth terminal that is connected to the earth. The DC port(s). AC port(s), and the ground-fault detection unit are connected together to share a commons ground, which is also the neutral line of the AC ports. The first DC bus(es) of the DC port(s) and the second DC bus(es) of the AC port(s) are connected together to form a converter DC bus with the DC-bus capacitor(s) connected to it. The ground-fault detection unit, connected between the common ground and the Protective Earth terminal, consists of a current sensor and a neutral ground resistor connected in series, together with a voltage sensor to measure the voltage between the Protective Earth terminal and the common ground. When the voltage of the Protective Earth terminal with respect to the common ground exceeds a certain value or when the current flowing through the ground-fault detection unit exceeds a certain value, a visual or audio warning signal is generated to warn the presence of a ground fault. A Residual Current Circuit Breaker or a Ground Fault Circuit Breaker can be connected to the AC port(s) to disconnect the converter in case of ground faults. Possible applications include any field that adopts power electronic converters that converts electricity between DC and AC, e.g., in wind power, solar power, storage systems, home appliances, IT equipment, motor drives, electric vehicles, more-electric aircraft, and all-electric ships.

A high-reliability multiphase power supply system and method. A second processing unit is configured with a first field-effect transistor, a drain electrode of the first field-effect transistor is connected to a power supply, a source electrode of the first field-effect transistor is connected to the drain electrode of a second field-effect transistor, the source electrode of the second field-effect transistor is connected to ground, and the gate electrodes of the first field-effect transistor and the second field-effect transistor are connected to a first processing unit; the second processing unit is configured with a first current detection module and a second current detection module, the first current detection module and the second current detection module are electrically connected to a bus unit, and the bus unit is electrically connected to a substrate management controller.