A method for diagnosing leakage of electronic parts and servicing guide of a driving state for a vehicle in a battery management system is provided. The method includes normally driving the vehicle or stopping the vehicle by cutting off a relay based on whether electronic parts broken due to insulation resistance breakdown are required for the driving of the vehicle. In addition, the method includes services a guide required for each broken electronic part about a driving state of the vehicle, by stepwise measuring insulation resistance of vehicle key on, engine starting, an operation of load parts such as a driving motor in the vehicle, an air conditioner, and a low-voltage DC-DC converter, and the like.

Apparatus and methods for electrical overstress (EOS) protection circuits are provided herein. In certain configurations, an EOS protection circuit includes an overstress sensing circuit electrically connected between a pad and a first supply node, an impedance element electrically connected between the pad and a signal node, a controllable clamp electrically connected between the signal node and the first supply node and selectively activatable by the overstress sensing circuit, and an overshoot limiting circuit electrically connected between the signal node and a second supply node. The overstress sensing circuit activates the controllable clamp when an EOS event is detected at the pad. Thus, the EOS protection circuit is arranged to divert charge associated with the EOS event away from the signal node to provide EOS protection.

A ground overcurrent control system includes ground circuit with a first section and a second section. The first section is electrically connected to a ground member of an electrical connector and the second section is electrically connected to a ground reference. A switch element is positioned between the first section of the ground circuit and the second section of the ground circuit. A controller is configured to determine the current within the ground circuit while current is passing through the switch element and, upon the current exceeding a current threshold, the switch element is modified to an open condition. Upon determining that the voltage between the first section of the ground circuit and the ground reference is less than a voltage threshold, a command is generated to modify the switch element back to a closed condition.

A power pedestal structured to be attached to a platform in the vicinity of water, the power pedestal including a pedestal member including a base structured to be attached to the platform and an enclosure extending from said base. The power pedestal further includes a stray current detection unit including a stray current probe structured to extend outside the enclosure and into the water to sense a voltage in the water and a stray current detection circuit electrically connected to the stray current probe and structured to detect a stray current in the water based on the voltage sensed by the stray current probe and to output an indicator signal in response to detecting the stray current. The power pedestal also includes an indicator electrically coupled to the stray current detection unit and structured to provide an indication in response to the indicator signal.

Circuits and methods of protection of an electrical power distribution system components, such as a power grid transformer, are disclosed. In example aspects, a transformer protection system may include a single switch electrically connected between a transformer neutral and ground that does not rely on zero crossing signals for actuation. In some further example aspects, the transformer protection system may include an overvoltage protection device electrically connected in parallel with a switch assembly and a DC blocking component between a transformer neutral and ground. In such arrangements, a sensor may be included within the transformer protection system to detect current through the overvoltage protection device, for example to detect activation of the overvoltage protection device.

The invention provides grounding safety control point monitoring method, measuring circuit and equipment grounding measuring system, wherein, The grounding safety control point monitoring method comprises the following steps: A safety monitoring level signal corresponding to each circuit is output according to the comparison result of the voltage between the grounding safety control points of at least one circuit and the preset grounding safety standard voltage; one circuit of safety action level signal is adjusted and output according to at least one circuit of input safety monitoring level signal; grounding safety protection is done according to the safety action level signal. All grounding points are monitored in real time by comparing the voltage between grounding safety control points with preset grounding safety standard voltage, so as to guarantee the product safety, equipment safety and personal safety.

Electric vehicle supply equipment (100) comprising a detection system (102), wherein the detection system (102) is configured to: create a star point (104) from phases from a multi-phase power source (1); measure (124, 126, 306, 316) a voltage difference between the star point and a neutral conductor (N) or an earth conductor (E); and cause (320) a disconnector (106) to electrically disconnect a vehicle charging interface (208) of the electric vehicle supply equipment (100) from the multi-phase power source (1) in dependence on the voltage difference exceeding a threshold.

Electric vehicle supply equipment (100) comprising a detection system (102), wherein the detection system (102) is configured to: create a star point (104) from phases from a multi-phase power source (1); measure (124, 126, 306, 316) a voltage difference between the star point and a neutral conductor (N) or an earth conductor (E); and cause (320) a disconnector (106) to electrically disconnect a vehicle charging interface (208) of the electric vehicle supply equipment (100) from the multi-phase power source (1) in dependence on the voltage difference exceeding a threshold.

An electronic fuse driver interface having a circuit arranged to couple to a driver, an electronic fuse, and a test load. The interface includes a switch configured to selectively couple a control input of the electronic fuse to a ground of the test load. The interface includes a resistor network between the ground of the test load and a ground of the driver. The switch is connected to the resistor network to switch the control input such that the electronic fuse selectively blocks current between a test supply voltage and the test load. The interface includes a diode connected between an intermediate node of the resistor network and the test supply voltage to provide a path between the ground of the test load and the test supply voltage.

An electronic fuse driver interface having a circuit arranged to couple to a driver, an electronic fuse, and a test load. The interface includes a switch configured to selectively couple a control input of the electronic fuse to a ground of the test load. The interface includes a resistor network between the ground of the test load and a ground of the driver. The switch is connected to the resistor network to switch the control input such that the electronic fuse selectively blocks current between a test supply voltage and the test load. The interface includes a diode connected between an intermediate node of the resistor network and the test supply voltage to provide a path between the ground of the test load and the test supply voltage.