Abstract: According to one embodiment, an electronic apparatus includes a first terminal on a first board, a second terminal on a second board, a connection member configured to transmit signals between the first board and the second board, the connection member including a wire rod member including kinds of wire rods, a first connector capable of being connected to the first terminal and the second terminal, and a second connector capable of being connected to the first terminal and the second terminal, wherein at least one of the signals is not transmitted when the first connector is connected to the second terminal and the second connector is connected to the first terminal.

Abstract: The present invention is related to a hybrid fault current limiter comprising a switching unit detaching a moving contact located on a cable and transmitting a trip signal if a fault current is flowed at an electric power system, a semiconductor switching unit connected in series with the switching unit and configured to be turned off to limit the flow of the fault current when the trip signal is transmitted, and a circuit breaking unit connected in parallel to the switching unit and the semiconductor switching unit and configured to limit the fault current detoured from the switching unit and the semiconductor switching unit. The present invention provides rapid treatment for the fault current problem by applying the algorithm sensing the occurrence of the fault current and the algorithm limiting the fault current simultaneously.

Abstract: A method for protecting against over voltage in a power supply comprises monitoring current amplitude and direction on an output connection of a power source that combines power from a plurality of power sources, and determining occurrence of a fault condition of the monitored power source based on the current amplitude and direction. In a fault condition of the monitored power source, operation of the monitored power source subject to the fault condition is terminated while continuing operation of the plurality of power sources exclusive of the monitored power source.

Abstract: A power switching circuit according to an exemplary embodiment of the present invention includes an output transistor connected between a power supply terminal VCC and an output terminal OUT, an output controller which controls a conducting state of the output transistor according to an input signal, a sense transistor having a gate commonly connected with the output transistor, which detects an output current flowing into the output transistor, an output current detection terminal in which a detection voltage is generated according to the output current detected by the sense transistor and a short circuit detector which detects a short circuit condition of the output current detection terminal according to the detection voltage and stops the output transistor or limits the output current.

Abstract: Even if a network setting changes due to power interruption or the like, communication for controlling the operating status of load devices of an uninterruptible power supply is enabled to continue. A network communication system (1) for the uninterruptible power supply comprises UPS member controllers (12 and 13) and a UPS group controller (11) which are connected in a network (2) to control the operating status of the load devices (3) of the uninterruptible power supply (1). The UPS group controller (11) and the UPS member controllers (12 and 13) execute data communication according to a predetermined communication protocol (Internet Protocol or the like) through the network (2), and these controllers transmit/receive data in which specific identification information issued for each of the UPS member controllers (12 and 13) is added to control data as communication data in the data communication according to the predetermined communication protocol.

Abstract: An over-current protection circuit for preventing a function module from over-current, the function module obtains power from a power source via an input port. The over-current protection circuit includes a path switch, a current detection circuit, a conductor switch, a first control module, and a second control module. The current detection circuit and the path switch form a loop with the input port and the function module. The current detection circuit detects a value of a current of the loop, and produces a first control signal when detecting the current of the loop is equal to or greater than a predetermined current value. The first control module turns off the conductor switch when receiving the first control signal. The second control module turns off the path switch when the conductor switch is turned off, thereby cutting off the loop.

Abstract: A first overcurrent detecting circuit outputs a first time-up signal when a time period, in which an electric current flowing into the wire harness is greater than the first threshold, reaches a first duration time, which corresponds to a first threshold. A second overcurrent detecting circuit outputs a second time-up signal when a time period, in which an electric current flowing into the wire harness is greater than the second threshold, reaches a second duration time, which corresponds to a second threshold. The second threshold is less than the first threshold. The second duration time is longer than the first duration time. A determination circuit determines that an overcurrent flows into the wire harness and cause a control circuit to deactivate the switching element when inputting at least one of the first and second time-up signals.

Abstract: A motor detecting and protecting apparatus electrically connected with a motor. The motor detecting and protecting apparatus includes a detecting unit, an error determining unit, a controlling unit and a driving unit. The detecting unit detects a state of the motor and outputs at least one first detecting signal and at least one second detecting signal to the error determining unit. The error determining unit has a first predetermined value, wherein the error determining unit outputs a warning signal to the controlling unit while a variation value between the first detecting signal and the second detecting signal exceeds the first predetermined value. And the controlling unit will control the motor to stop operating by the driving unit in accordance with the warning signal. And a motor detecting and protecting method is also disclosed.

Abstract: An overcurrent protection apparatus which, when a layer short or a dead short occurs in a load circuit, interrupts the circuit in accordance with respective situations, whereby the load circuit is protected is provided. The apparatus includes a first overcurrent detecting section for detecting a counter electromotive force generated in a power supply wiring, and a second overcurrent detecting section, disposed in each of the plural load circuits, for detecting that a load current ID becomes an overcurrent. The apparatus includes a delaying section for outputting a delay signal at a first delay time when an overcurrent is detected by the second overcurrent detecting section, and for outputting the delay signal at a second delay time which is shorter than the first delay time when an overcurrent is detected by both of the first overcurrent detecting section and the second overcurrent detecting section.

Abstract: A differential-current switch includes a first unit arranged in an electric power supply network for detecting a differential current and outputting an analog differential current signal, an analog-to-digital converter receiving the outputted analog differential current signal and converting the outputted analog differential current signal to a digital differential current signal, a first digital signal processing unit receiving the digital differential current signal, a second unit for disconnecting circuit breaker contacts in the electric power supply network, and first means connected upstream of the analog-to-digital converter for adjusting the analog differential current signal. Adjustment of the analog differential current signal provides favorable resolution of a differential current signal over a wide dynamic range.

Abstract: A self-adaptive surge-proof circuit is used in a switching power supply device. The switching power supply device includes an AC input, a filter-rectifier circuit connected to the AC input, and a power converter circuit connected to the filter-rectifier circuit. The self-adaptive surge-proof circuit includes a surge suppression unit connected between the filter-rectifier circuit and the power converter circuit, a switching unit connected in parallel with the surge suppression unit for adjusting an input impedance of the switching power supply device, a sampling unit connected to the filter-rectifier circuit for collecting a surge signal from the filter-rectifier circuit, and a drive-controlling circuit connected to the sampling unit for generating a driving signal for controlling on and off of the switching unit according to the surge signal.

Abstract: In a lead mounting method of mounting, onto a principal surface of a printed board, a lead to be connected to a terminal, a flat lead is prepared which lead has a mounted part to be disposed on the principal surface of the printed board and a connected part to be connected to the terminal. The flat lead is bent into an L shape so that the mounted part and the connected part are perpendicular to each other to obtain an L-shaped lead. The mounted part of the L-shaped lead is connected and fixed onto the principal surface of the printed board by soldering.

Abstract: A lighting controller includes a housing and a power transformer mounted in the housing for stepping down an inputted AC power signal at a first higher voltage to at least one output AC power signal at a second lower voltage for powering a plurality of light fixtures. The controller further includes a switching device that can be closed and opened to connect and disconnect a primary winding of the power transformer to a source of AC power that can provide the inputted AC power signal. At least one wire connection terminal is connected to a secondary winding of the power transformer. A face pack is removably mounted in the housing and is operatively connected to the source of AC power and the switching device. The face pack includes a display, at least one manually actuable input device, a processor, a memory operatively connected to the processor, and an operational program stored in the memory.

Abstract: A semiconductor component that includes a current limit circuit and a method for limiting current in the semiconductor component. An input/output pin is connected to the gate of a transistor and a control resistor is connected between the gate of the transistor and its source. One terminal of the control resistor is connected to the input/output pin and the other terminal is connected to another input/output pin. A current source is connected to the input/output pin. A reference voltage is generated between the two input/output pins and compared with a drain-source voltage that is between one of the two input/output pins and another input/output pin. A control voltage is set in accordance with the comparison. The control voltage then controls the voltage on another of the pins that is not common to the reference voltage and to the drain-source voltage.

Abstract: Systems, circuits, and methods are described for providing efficient, monitoring capabilities for providing output reactive to monitored conditions. According to the disclosed methods, steps are included for providing a floating gate monitoring circuit in association with a monitored circuit and programming the floating gate to a selected charge level. The programmed floating gate charge level is then compared with a signal level in a monitored circuit. In an additional step, selected comparison criteria are used for selectably activating output. Exemplary embodiments of methods and associated circuits and systems employing the methods are also disclosed, in which protection for a monitored circuit is provided in the event of undervoltage, undercurrent, overvoltage, or undervoltage.

Abstract: An electrical device protection apparatus, such as an overload relay, can include a microprocessor 102 that can receive a wide range of current signals from a current transformer or other current sensor. Also microprocessor 102 can employ a voltage sensor 112 to measure line voltage, for representing true power, and as a power supply 114 source for the microprocessor 102. The microprocessor can then generate annunciation signals 118, control signals 120, and/or communication signals 122 as necessary for the control and/or protection of an attached electrical device.

Abstract: A transient blocking unit (TBU) is an arrangement of two or more transistors connected to each other in series such that they automatically switch off when a TBU current passing through these transistors exceeds a predetermined threshold. Voltage turnoff capability is provided for a TBU by adding a voltage comparison circuit to the TBU. The voltage comparison circuit provides gate voltages to one or more of the TBU transistors that tend to turn off the TBU transistors, if the voltage at the TBU output (i.e., the protected device output voltage) falls outside a predetermined range. The voltage provided by the voltage comparison circuit adds constructively to the gate voltages provided by normal TBU operation. Accordingly, TBU switch off can be driven by an over-current condition (TBU current out of range) and/or by an over-voltage condition (TBU output voltage out of range).

Abstract: To provide an overcurrent protection apparatus for a load circuit which can detect an overcurrent accurately without being influenced by the offset voltage Voff of an amplifier (AMP1). When the amplifier (AMP1) has the offset voltage Voff which is a positive value (Voff>0), a current obtained by subtracting a current Ia from a current I1 flowing through a resistor R1 by conducting a current source IA is flown into a resistor R3. In contrast, when the amplifier (AMP1) has the offset voltage Voff which is a negative value (Voff<0), a voltage drop is generated at a resistor R2 by conducting a current source IB to thereby control so that a voltage Vds becomes same as the voltage generated at the resistor R1. Thus, since a voltage V3 generated at the resistor R3 becomes a voltage from which the influence of the offset voltage Voff is eliminated, it is possible to determine an overcurrent accurately by eliminating the influence of the offset voltage Voff.

Abstract: Provided is an electronic circuit including an upper control unit and a lower control unit. The upper control unit performs a logic transition of a gate signal so as to off-latch an upper switch by using the fall edge of a drive signal as a trigger and release the off-latch of the upper switch by using the rise edge of a monitor signal as a trigger. The lower control unit performs a logic transition of the gate signal so as to off-latch a lower switch by using the rise edge of the drive signal as a trigger and release the off-latch of the lower switch by using the rise edge of a monitor signal as a trigger.

Abstract: Devices, such as mobile devices, may be exposed to short circuit and output overload events. To protect against such events, mobile devices typically include current limit circuits. Some current limit circuits may involve user programmable function. User programmable function may need accurate current limit detectors. Various embodiments of the present invention include devices and methods for detecting one or more programmed current limits. Some embodiments allow for a user application to select among parallel or serial configurations of current detection circuitry. Each such configuration may include multiple resistive devices of different resistive values.

Abstract: The adaptive power management system for aircraft galleys includes one or more programmable circuit breakers for corresponding interchangeable aircraft galley inserts. Current rating settings of the programmable circuit breakers can be changed by direct interrogation by a galley network controller, which can also automatically switch selected circuit breakers to open to shut down the power supply to an entire galley complex or individual galley inserts, as needed, or by a passive signal.

Abstract: An over-current protection circuit, including a current input for receiving a input current and a current output electrically connectable to a load, for outputting an output current proportional to the input current. A switch connects the current input to the current output. The switch has at least two switch states including an open state in which a current flow from the current input to the current output is interrupted and a closed state in which the current flow is enabled. The switch includes a switch control input for controlling the switch state. The circuit has a sensor for sensing a load current applied to the load and a controller connected to the sensor for controlling the switch to be in the open state when the sensed load current has exceeded a current threshold during a predetermined period of time, the predetermined period of time being dependent on an amount with which said sensed load current exceeds the threshold.

Abstract: A system includes a high-current junction, a voltage sensor, and a controller. Power connectors of two components are electrically connected at the high-current junction, where a high current passes between the two components at the high-current junction. The voltage sensor detects a voltage at the high-current junction. The controller performs a predetermined action in response to the voltage sensor detecting the voltage at the high-current junction being greater than a predetermined threshold voltage. The system may be a data center rack. The high-current junction may be the junction at which an alternating current (AC) input receives AC power from AC mains. The high-current junction may alternatively be the junction at which a power supply receives the AC power from the AC input to generate direct current (DC) power to provide to data center rack components insertable within the data center rack.

Abstract: The invention relates to a method and an electrical protection and monitoring device with an insulation monitoring instrument and a differential current monitoring instrument in an electric vehicle for safe driving operation and also for safe charging and energy recovery operation of the electric vehicle at a charging station. The invention further relates to a device for the safe charging and energy recovery operation of an electric vehicle at a charging station with electrical protection and monitoring devices.

Abstract: A charging monitor has a switch disposed between a load section having a storage battery and an external AC power supply supplying a current to the load section via a plurality of lines and interrupts the supply of the current from the external AC power supply to the load section; a current detection circuit; a suppression circuit that suppresses a DC component contained in the detection signal; a filter circuit that filters a plurality of frequency components contained in the detection signal so that attenuation increases as a frequency becomes high; a rectifier smoothing circuit that rectifies and smoothens an output signal; and an electric leakage determination circuit that detects an electric leakage and shuts off the switch.

Abstract: An apparatus for detecting and controlling current. A current detector for generating a first value that represents an amount of current being delivered to a device. A current limit circuit for generating a second value that represents a maximum permitted current level from a current source. A current controller for controlling the amount of current drawn by the device if the first value exceeds the second value.

Abstract: A circuit breaker system and method having zone selective interlock features is provided. The system and method include the transmission of a selective interlock signal from a downstream circuit breaker to an upstream circuit breaker in the event a first or second fault condition is detected. The upstream circuit breaker upon receipt of this signal changes the response of the second circuit breaker depending on whether the first or second fault condition has been detected.

Abstract: A circuit for driving a transistor half bridge is disclosed that comprises a series circuit of a first and a second transistor both having intrinsic or external free-wheeling diodes coupled in parallel. The circuit for driving a transistor half bridge comprises: an over-current detection circuit that is configured to signal an over-current condition when a load current flowing through the first transistor exceeds a first threshold; a protection circuit that is coupled to the over-current detection circuit and that is configured to disable an activation of the first transistor in response to a detected over-current and to re-enable the activation of the first transistor after a first time interval has elapsed; an evaluation circuit that is coupled to the over-current detection circuit and that is configured to check whether a further over-current condition is detected within a second time interval that follows the first time interval.

Abstract: An electrical circuit comprising a power supply, a load, a first pair of parallel positive cables between the power supply and the load, a first pair of parallel negative cables between the load and the power supply, and incendive arc prevention means, in which the incendive arc prevention means comprises monitoring means adapted to monitor the first pair of positive cables and the first pair of negative cables, and to detect if the current and/or voltage in one of the first pair of positive cables deviates from the other, and if the current and/or voltage in one of the first pair of negative cables deviates from the other, and in which the incendive arc prevention means comprises a control means adapted to fully or partially isolate the power supply from the first pair of positive cables and the first pair of negative cables if the monitoring means detects that the current and/or voltage of one of the first pair of positive cables has deviated from the other, or if the current and/or voltage of one of the fi

Abstract: A module hot swap circuit includes a low voltage-drop rectifier adapted to receive either positive or negative voltages of different absolute values. The rectifier is coupled to a power manager that provides dual startup/shutdown voltage thresholds and inrush current limiting. A detector prevents reverse current flow allowing the module to hold up during input voltage drop-outs.

Abstract: The voltage of a detection resistor connected to the drain of a low-side switching device is normally a negative voltage, but a positive voltage appears when a countercurrent occurs in an abnormal state. A current comparator monitors the voltage of the detection resistor, transmits high output to an AND circuit whole the voltage of the detection resistor is a negative voltage to maintain the output voltage of the current comparator in a low state when an output signal of a driver can be transmitted to the low-side switching device, and allows the output voltage of the current comparator in a low state when the voltage of the detection resistor becomes a positive voltage, thereby forcibly turning off the low-side switching device.

Abstract: Provided is a moisture detection device including: a moisture detection label that has at least a pair of detection terminals and a pattern, the detection terminals being provided on abase material with an insulated front surface, the pattern being provided on the surface of the base material and formed between the detection terminals with water-dispersible and conductive paint; and detection circuit which detects an electrical connection state between the detection terminals.

Abstract: A regulating system includes an input port having a first input terminal and a second input terminal, an output port having a first output terminal and a second output terminal, a regulating circuit, an over-current protection circuit, and an overvoltage protection circuit. The overvoltage protection circuit includes a regulating diode, a first bipolar transistor and a second bipolar transistor. The first output terminal is connected to the base of the first bipolar transistor via the regulating diode and grounded via first bipolar transistor. A base of the second bipolar transistor connects to the collector of the first bipolar transistor. The second output terminal is grounded via the second transistor. When an output voltage of the first output terminal increases over a predetermined voltage, an electrical connection between the second output terminal and ground is cut off to stop providing output voltage from the output port.

Abstract: A bi-directional protection circuit employs a single comparator for detecting fault conditions. Diodes are coupled between a detection node and voltage dividers setting references for inverting and non-inverting comparator inputs, each diode forward biased during one of the positive and negative halves of the alternating current input signal cycle and coupling the detection node to a respective one of the inverting and non-inverting comparator inputs, and reverse biased during the other of the positive and negative halves and decoupling the detection node from the other of the inverting and non-inverting comparator inputs. Upon an overcurrent condition during the positive half, a voltage at the inverting comparator input is drawn above the reference voltage at the non-inverting input. Upon an overcurrent condition during the negative half, a voltage at the non-inverting comparator input is drawn below the reference voltage at the inverting input.

Abstract: An exemplary gas-insulated switchgear device is disclosed which includes a current sensor and a voltage sensor located at a partition insulator. The current sensor can include a magneto-optical fiber on a flexible carrier strip and can be manufactured separately for being easily mounted to an assembled switchgear device. The current sensor can include an electro-optical fiber extending radially into the partition insulator and whose ends are embedded in recesses in the bus bar as well as in the metal embracing of the partition insulator for accurately integrating the voltage.

Abstract: A method for operating an electrical power supply network is described. The power supply network has several levels of different voltages. The levels are interconnected by switches. A first switch is made so that the maximum interruptible short-circuit current of the first switch is smaller than the maximum flowing short-circuit current. In the event of failure, a test is made as to whether the short-circuit current presently flowing through the first switch is smaller than the maximum interruptible short-circuit current. The first switch will remain closed if this is not the case, and the first switch will be opened if this is the case.

Abstract: A compressor monitoring system includes current and voltage monitors, current and voltage averaging modules, a control module, and a switch. The current monitor measures a current drawn by a motor of a compressor. The current averaging module generates first and second average current values based on the current measured by the current monitor. The voltage monitor measures a utility power voltage. The voltage averaging module generates first and second average voltage values based on the voltage measured by the voltage monitor. The control module selectively generates a fault signal when a first ratio is greater than a first predetermined threshold and a second ratio is less than a second predetermined threshold. The first ratio is based on the first and second average current values. The second ratio is based on the first and second average voltage values. The switch deactivates the motor when the fault signal is generated.

Abstract: An electronic control for a circuit breaker with automatic breaker rating is disclosed. The electronic control includes a memory to store circuit breaker ratings, a breaker rating switch to select circuit breaker ratings, and a microprocessor operatively coupled to the breaker rating switch and the memory. The microprocessor is configured to interpret a selected circuit breaker rating of the breaker rating switch, set an amplifier gain adjustment for the circuit breaker based on the selected circuit breaker rating, and transmit the selected circuit breaker rating to the memory for storage in the memory.

Abstract: An arc flash detector includes a light sensor, a light attenuating filter in communication with the light sensor, a housing disposed to support the light attenuating filter and the light sensor, and a logic circuit in communication with the light sensor. The logic circuit is disposed to receive an output of the light sensor and disposed to produce an output signal responsive to a predetermined intensity of light received by the light sensor. The light attenuating filter is disposed to reduce the intensity of light received by the light sensor. The housing is also disposed to retain the light sensor and the light attenuating filter at a fixed orientation.

Abstract: An electronic device assigns power to USB ports dynamically. A total current detection circuit transmits driving voltage signals to the USB ports, and detects whether a total current provided to the USB ports exceeds a rated total current and output a total current detection signal. A plurality of short-circuit detection circuits detects whether USB devices connected to the corresponding USB ports are shorted and to output a short-circuit detection signal. A plurality of relay circuits switch connection between the USB ports and the power circuit. A USB controller outputs a control signal according to the total current detection signal and the short-circuit detection signal and directs the relay circuits to switch connection between the corresponding USB ports and the power circuit on and off.

Abstract: An over-current protection circuit is disclosed that provides a current limit threshold using resistors in the path of a scaled mirror current of a load current. The protective circuit has a first state that passes a supply source to a device, but when the threshold is reached the circuit becomes a feedback circuit that allows only a set final current to be passed to the device. When the load current reaches the threshold, the mirror current reaches a corresponding threshold that triggers a comparator and circuitry that then limits and fold backs the load current.

Abstract: The present invention relates to a set protection circuit for when a diode short-circuit defect occurs in a power factor correction circuit of a critical conduction mode. In a conventional power factor correction circuit, an excessive amount of current flows to a switch if a diode is short-circuited so that the switch is damaged. In order to prevent damage to the switch, the present invention provides a method for stopping turn-on of the switch when a switch current is excessive.

Abstract: An aircraft electrical system comprises a generator to be driven as part of a gas turbine engine. The generator supplies electrical power to a plurality of accessories associated with the gas turbine engine, and to an aircraft power bus in parallel to the supply to the accessories. A control detects a short circuit on the aircraft power bus. When a short circuit is detected on the aircraft power bus, a switch is driven open to disconnect the aircraft power bus from the generator. In this manner, the power will continue to be delivered to the plurality of accessories. In a separate feature, a control voltage is provided by an auxiliary permanent magnet generator to a voltage regulator for the main generator.

Abstract: A line current differential protection system that uses an external time reference continues providing protection to a power apparatus upon the loss of the external time reference. An external time reference synchronization mode and a channel based synchronization mode may be selectively applied on a per channel basis such that only those channels in the system that are not guaranteed to stay symmetrical use external time reference synchronization.

Abstract: Administering offset voltage error in a current sensing circuit including recording by a power supply management module a current sensing voltage for a power supply when no operating load is drawn from the power supply and dynamically calculating by the power supply management module output current of the power supply with an active load in dependence upon the recorded current sensing voltage.

Abstract: A power converter includes a transformer, a switch element, a control circuit, an over-current detecting circuit, and a compensation signal generating circuit. The transformer includes a primary winding and at least an auxiliary winding. The control circuit is coupled to the switch element, and controls on/off status of the switch element to control a primary current flowing through the primary winding. The over-current detecting circuit compares the primary current with a current limit, and then controls the control circuit to turn off the switch element if the primary current is greater than the current limit. The compensation signal generating circuit is coupled between the auxiliary winding and over-current detecting circuit, and provides an adjustment value to calibrate the current limit according to an output of the auxiliary winding; wherein the adjustment value varies with time when the switch element is turned on.

Abstract: A circuit breaker is disclosed that provides a warning that the current through the circuit breaker exceeds a warning threshold. The circuit breaker comprises: a switch that carries a current I; an indicator for alternatively indicating: (i) that the current I has not exceeded IW, and (ii) that the current I has exceeded IW; and an actuator in series with the switch that: (i) causes the indicator to indicate that the current I has exceeded IW when and only when the current I has exceeded IW, and (ii) opens the switch when and only when the current I exceeds IT; wherein 0<IW<IT.

Abstract: An over-current protection circuit includes a voltage generating unit and a comparing unit. The voltage generating unit is configured for receiving a first voltage and generating a reference voltage. The reference voltage has an offset positively dependent on temperature and negatively dependent on the first voltage, and the offset of the reference voltage varies along with another offset varying within a sense voltage sensed by the over-current protection circuit. The comparing unit is configured for comparing the reference voltage with the sense voltage to output a control signal for de-asserting the sense voltage when the sense voltage is correlated to an over-current condition of the sense voltage exceeding the reference voltage. A driver is also disclosed herein.

Abstract: An apparatus includes first and second input terminals, a conversion circuit, a current limiting resistive device, a triac and a second winding. The first and second input terminals are configured to be connected to a source of input power. The conversion circuit is operably connected to the first and second terminals, and includes a first inductive winding coupled between the first terminal and a switching device. The conversion circuit also includes a rectifier coupled between the first inductive winding and a first output, and a capacitor coupled between the first output and circuit ground.

Abstract: A current source driving an LED is monitored for a fault condition such as an open circuit or a short circuit. The current source may be disabled and/or a common power source may be disabled in response to the type of fault condition. A test current may be applied to the current source to determine the type of fault.