System and method for protecting a power converter. The system includes a first comparator configured to receive a first threshold signal and a first signal and to generate a first comparison signal. The first signal is associated with an input current for a power converter. Additionally, the system includes a second comparator configured to receive a second threshold signal and the first signal and to generate a second comparison signal. The second threshold signal is different from the first threshold signal in magnitude. Moreover, the system includes a first detection component configured to receive at least the second comparison signal, detect the second comparison signal only if one or more predetermined conditions are satisfied, and generate a first detection signal based on at least information associated with the detected second comparison signal.

The present disclosure provides a control method for a current-limiting control circuit and an electrical system. The current-limiting control circuit includes a high voltage side connected with a direct-current (DC) bus, a low voltage side connected with a load, and a regulating unit connected with the high voltage side and the low voltage side, the regulating unit including at least one MOS transistor, and the control method includes: detecting current I.sub.0 of the current-limiting control circuit; determining whether the current I.sub.0 is greater than a preset current I; and determining that the current-limiting control circuit has a short circuit fault, and entering a current limiting control mode to limit a persistent growth of the current, in a case where the current I.sub.0 is greater than the preset current I.

To provide improved overvoltage protection for a voltage converter for converting an input voltage into a DC output voltage, a first switch-off unit is provided, which is configured to effect a switch-off of at least a part of the voltage converter if the DC output voltage reaches or exceeds a first voltage threshold, in order to reduce the DC output voltage. Furthermore, a second switch-off unit is provided, which is configured to check whether a mean value of the DC output voltage reaches or exceeds a mean value threshold and, if the mean value threshold is reached or exceeded, to effect a switch-off of at least a part of the voltage converter in order to reduce the DC output voltage.

In some examples, this disclosure describes a method for detecting a fault in an electrical power system comprising a bus connected between a first solid state power converter and a second solid state power converter. The method includes receiving, at a controller of the electrical power system, a first signal indicating a current at a source side of the first solid state power converter, wherein the source side of the first solid state power converter is connected to a power source of the electrical power system. The method also includes receiving, at the controller, a second signal indicating a current at the bus and determining, by the controller, that a fault occurred in the electrical power system based on the first signal and further based on the second signal. The method further includes controlling the first solid state power converter in response to determining that the fault occurred.

A power converter circuit includes a switch including a field effect transistor, the field effect transistor being a wide bandgap field effect transistor and being configured to maintain an on operational state responsive to a maintenance signal received through a gate terminal, a current sensing circuit that is configured to estimate a drain terminal current of the field effect transistor responsive to a voltage between the gate terminal of the field effect transistor and a source terminal of the field effect transistor, and a gate driving circuit that is configured to generate the maintenance signal responsive to the estimate of the drain terminal current.

A switching power supply includes: a DC-DC converter including a switching element and configured to output electric power input from an input terminal to an output terminal; a current detector configured to detect a load current output to the output terminal and to output a voltage corresponding to the load current as a detection result; a time constant circuit having a predetermined charging time constant; a time constant circuit controller configured to be connected to the current detector and the time constant circuit and configured to output a charging current based on the detection result to charge the time constant circuit or discharge charge charged in the time constant circuit as a discharging current on based on a comparison between the detection result output by the current detector and a reference voltage.

A fault isolation apparatus includes a controller and a circuit breaker. When the circuit breaker is located on a bus connected to a DC/DC conversion unit, if a voltage collected by a first voltage collection terminal is a negative value, it indicates that input or output of the DC/DC conversion unit is reversely connected. In this case, if the circuit breaker is controlled to be opened, the DC/DC conversion unit can be prevented from being connected in series to other parallel DC/DC conversion units. If a voltage collected by a first voltage collection terminal is low and a current collected by a current collection terminal is large, it indicates that the DC/DC conversion unit is short-circuited. In this case, if the circuit breaker is controlled to be opened, another component connected in series to the DC/DC conversion unit can also be prevented from backfeeding energy to the DC/DC conversion unit.

In a line to line fault detection and protection system, a source end power supply supplies power to a remote load over a transmission line and monitors the dynamic behavior of a transmission line power characteristic. If that dynamic behavior is outside a constraint that is actively imposed on the transmission line dynamic behavior by a load end power conditioning system, a possible line to line fault is recognized. The preferred power characteristic is current and the preferred constraint is a maximum rate of change of current drawn from the transmission line by the load end power conditioning system.

To provide a power converter and a breaking mechanism which can break a DC current and can suppress that a fused material scatter to other circuits at fusing, in the case where the breaking mechanism of excess current is formed by a circuit pattern of a circuit board. In a power converter, a supporting member is provided with a support body part; a fixation projection part which projected from the support body part and to which the multilayer circuit board was fixed; and a support projection part which projected from the support body part and supports an one side circuit board face, wherein the fuse pattern is provided in an inner layer, and the support projection part overlaps with at least one part of a fusing part of the fuse pattern, viewing in a normal direction of the circuit board face of the multilayer circuit board.

An electronic apparatus includes: a converter including a switching device, an inductor, and an output capacitor; a protection switching device provided between the inductor and the output capacitor; and a protection circuit configured to provide a control voltage to: turn on the protection switching device based on a first voltage applied between the inductor and the protection switching device, the first voltage being lower than or equal to a threshold level corresponding overvoltage, and turn off the protection switching device based on the first voltage, the first voltage being higher than the threshold level. The control voltage is varied depending on variation in the input voltage or the output voltage and having a level corresponding to a threshold voltage for turning on or off the protection switching device.