A protection device for protecting an electronic device includes a current sensing module, for detecting a current flowing through a power supply path of the electronic device to generate a current signal; a processing device, coupled to the current sensing module, for receiving the current signal to determine whether the current corresponding to the current signal is greater than a first threshold value and outputting a control signal accordingly; a first switch, disposed on the power supply path, for controlling the power supply path to be switched on or off according to an input voltage of the power supply path; and a first control module, coupled to the processing device and the first switch, for controlling the first switch to be turned on or off according to the control signal outputted by the processing device, in order to control the power supply path to be switched on or off.

A fully integrated circuit configuration that can be used to control the power path of a number of PMOS load switches is described. The circuit has a unique feature that it can automatically select the input voltage to be presented to the VOUT pin based upon the voltage levels at the respective VIN pins. By using combinations of the EN input pin and the SEL input pin, the circuit can be configured to perform one of four functional behaviors: 1. Complete shutdown (both switches in the OFF position), 2. Automatic input selection according the voltage levels that are presented on the VIN pins, 3. Selection of the VIN1 input only, or 4. Selection of the VIN2 input only. This concept is extended to multiple input sources in further embodiments.

A fully integrated circuit configuration that can be used to control the power path of a number of PMOS load switches is described. The circuit has a unique feature that it can automatically select the input voltage to be presented to the VOUT pin based upon the voltage levels at the respective VIN pins. By using combinations of the EN input pin and the SEL input pin, the circuit can be configured to perform one of four functional behaviors: 1. Complete shutdown (both switches in the OFF position), 2. Automatic input selection according the voltage levels that are presented on the VIN pins, 3. Selection of the VIN1 input only, or 4. Selection of the VIN2 input only. This concept is extended to multiple input sources in further embodiments.

A method for analyzing power quality events in an electrical system includes processing electrical measurement data from or derived from energy-related signals captured by at least one metering device in the electrical system to generate at least one dynamic tolerance curve. Each dynamic tolerance curve of the at least one dynamic tolerance curve characterizes a response characteristic of the electrical system at a respective metering point in the electrical system. The method also includes analyzing the at least one dynamic tolerance curve to identify special cases which require further evaluation(s)/clarification to be discernable and/or actionable. The at least one dynamic tolerance curve may be regenerated or updated, and/or new or additional dynamic tolerance curves may be generated, to provide the further clarification. One or more actions affecting at least one component in the electrical system may be performed in response to an analysis of the curve(s).

A motor control apparatus according to one aspect of the present invention is configured to be connected to a motor by a wiring line, and includes: a motor driving unit for driving a motor; a current command unit for commanding supply of current to the motor driving unit; and, a miswiring detecting unit for detecting miswiring of lines connected to motors by acquiring via wiring lines a signal indicating the motor temperature detected by a motor temperature detector provided for the motor, wherein the miswiring detecting unit detects presence or absence of miswiring of the wiring lines, based on the change of the motor temperature when the current command unit commands supply of reactive current to the motor driving unit.

In an electrical cord reel, a rotatable member can rotate about a winding axis to spool and unspool a linear material. An input power connector can couple to an electrical power source. An output power connector on the rotatable member can couple to an electrical cord at least partially wound about the rotatable member. A switch is adjustable to allow or prevent electrical current flow from the input power connector to the output power connector. In an aspect, the electrical cord reel includes an electric cord comprising a first power wire, a second power wire, and a signal wire. A method of controlling the electric cord spool system includes energizing the first power wire and the signal wire. The method further includes determining a continuity of the signal wire. The method further includes de-energizing the first power wire when determining discontinuity of the signal wire.

A method of establishing current limits for each of a plurality of device couplers mounted on a trunk of an electrical circuit at distributed physical positions, in which each of said device couplers is capable of servicing one or more spurs connected thereto, and in which said trunk has a total trunk current and a known resistive component, comprising the steps of: a) establishing physical characteristics of the electrical circuit including i) an order in which said device couplers are mounted on said trunk along its length; ii) a load current each device coupler requires to service the one or more spurs connected thereto; and, iii) a voltage drop of each of said sections of trunk caused by the resistive component thereof, which is proportional to a physical length thereof and the combined load currents of each device coupler serviced by that section of trunk; b) calculating a current limit for each device coupler, which current limit is greater than said load current, according to a predetermined tolerance rationale; c) calculating an intermediate trunk current available to each device coupler by deducting from said total trunk current the current limits of each device coupler preceding that device coupler in said order, as well as a consequential reduction in current caused by said voltage drop of each of said sections of trunk preceding that device coupler; and, d) adjusting said current limits so none exceeds the intermediate trunk current available to the corresponding device coupler.

A battery management system for a battery module having at least one battery cell provides a current path between poles of the battery module in response to a tripping signal. The current path prevents or terminates an arc in a fuse of the at least one battery cell after the fuse has been tripped. The battery management system can further include an apparatus to trip the fuse and provide the tripping signal in response to identifying the tripping of the at least one fuse. The battery management system can further include an apparatus to receive the tripping signal.

A solid-state zero current switching circuit breaker is configured to interrupt current flow between a voltage input and a load. The solid-state zero current switching circuit breaker includes at least one resonant capacitor cell having an input configured to receive a source voltage and an output configured to deliver drive current to the load. The resonant capacitor cell is configured to selectively limit the drive current to the output based on a variable voltage. The solid-state zero current switching circuit breaker further includes at least one voltage clamping switch configured to detect a short-circuit fault or an overload condition. The voltage clamping switch adjusts the variable voltage in response to detecting the short-circuit fault condition or the overload condition such that the resonant capacitor cell limits the drive current.

A solid-state zero current switching circuit breaker is configured to interrupt current flow between a voltage input and a load. The solid-state zero current switching circuit breaker includes at least one resonant capacitor cell having an input configured to receive a source voltage and an output configured to deliver drive current to the load. The resonant capacitor cell is configured to selectively limit the drive current to the output based on a variable voltage. The solid-state zero current switching circuit breaker further includes at least one voltage clamping switch configured to detect a short-circuit fault or an overload condition. The voltage clamping switch adjusts the variable voltage in response to detecting the short-circuit fault condition or the overload condition such that the resonant capacitor cell limits the drive current.