Systems and methods for providing current for a plurality of circuits are provided. Aspects include receiving, by a controller, a fault threshold for each circuit of the plurality of circuits, operating one or more switching circuits to output a current for each circuit of the plurality of circuits, wherein the one or more switching circuits are coupled to a constant current sources, and wherein the one or more switching circuits drive a plurality of current drive circuits, monitoring, by a fault determining circuit, a voltage across each circuit of the plurality of circuits, and determine a fault condition for a first circuit in the plurality of circuits based at least in part on the voltage across the first circuit exceeding the fault threshold for the first circuit.

A system includes a first device and N number of second devices. The first device generates, based on a DC input signal, a first DC output voltage and a first enabling signal, enabled by which, a first one of the second devices generates a second DC output voltage and a second enabling signal based on the DC input signal. In a similar manner, an i.sup.th one of the second devices is enabled by an (i−1).sup.th one of the second devices to generate an (i+1).sup.th DC output voltage and an (i+1).sup.th enabling signal based on the DC input signal. A starting time point of a logic-high level portion of each enabling signal is later than a peak time point corresponding to a peak voltage of the corresponding DC output voltage.

Fault-protection is provided in electrical devices by redundancy in diodes on diode legs of the bridge rectifier and a fault-protection circuit. The fault-protection circuit is configured: (i) for electrical coupling between a return of input DC power to a step-down switching DC-DC converter and a return rail of rectified DC voltage of the output DC power generated by the bridge rectifier, and is configured to perform opening the switch based on sensing a current fault or voltage fault, or (ii) to sense current from a step-down switching DC-DC converter, a first voltage from the step-down switching DC-DC converter, and/or a second voltage at an output of the step-down switching DC-DC converter, and open the circuit on a fault.

Fault-protection is provided in electrical devices by redundancy in diodes on diode legs of the bridge rectifier and a fault-protection circuit. The fault-protection circuit is configured: (i) for electrical coupling between a return of input DC power to a step-down switching DC-DC converter and a return rail of rectified DC voltage of the output DC power generated by the bridge rectifier, and is configured to perform opening the switch based on sensing a current fault or voltage fault, or (ii) to sense current from a step-down switching DC-DC converter, a first voltage from the step-down switching DC-DC converter, and/or a second voltage at an output of the step-down switching DC-DC converter, and open the circuit on a fault.

A light source driver for a light source of a luminaire. The disclosure proposes to monitor a parameter, responsive to or a cause of a temperature change in a resistive element to facilitate determination of whether the light source driver is compatible with an AC supply. The resistive element in connected in series between the rectifying arrangement, of the light source driver, and the energy storage capacitor for storing charge that powers the light source.

A control device for controlling a lighting system with sanitizing function comprises a printed circuit board connectable to at least one lamp of the lighting system provided with at least one sanitizing source; at least one presence sensor connected to the board by a communication system, for example a wireless communication system; an amperometric sensor connected to the sanitizing source to measure the current in the sanitizing source; the board is configured so as to disable the sanitizing source or to reduce the power supply to the sanitizing source below a threshold value when the presence sensor detects the presence of users; or when a malfunction is detected in the communication system and the amperometric sensor detects in the sanitizing source a current greater than the threshold value.

A control device for controlling a lighting system with sanitizing function comprises a printed circuit board connectable to at least one lamp of the lighting system provided with at least one sanitizing source; at least one presence sensor connected to the board by a communication system, for example a wireless communication system; an amperometric sensor connected to the sanitizing source to measure the current in the sanitizing source; the board is configured so as to disable the sanitizing source or to reduce the power supply to the sanitizing source below a threshold value when the presence sensor detects the presence of users; or when a malfunction is detected in the communication system and the amperometric sensor detects in the sanitizing source a current greater than the threshold value.

A method is provided for driving a half bridge circuit that includes a first transistor and a second transistor that are switched in a complementary manner. The method includes generating an off-current during a plurality of turn-off switching events to control a gate voltage of the second transistor; measuring a transistor parameter of the second transistor during a first turn-off switching event during which the second transistor is transitioned to an off state, wherein the transistor parameter is indicative of an oscillation at the first transistor during a corresponding turn-on switching event during which the first transistor is transitioned to an on state; and activating a portion of the off-current for the second turn-off switching event, including regulating an interval length of the second portion for the second turn-off switching event based on the measured transistor parameter measured during the first turn-off switching event.

The present invention discloses a switching regulator capable of reducing current ripple and a control circuit thereof. The switching regulator includes a buck power stage circuit and a control circuit. The control circuit includes an operation signal generation circuit and a current source circuit for reducing current ripple. The current source circuit is coupled to the operation signal generation circuit and the buck power stage circuit, for operating a ripple reduction switch therein according to an operation signal, to convert the output voltage to a load voltage between a load node and a reference node, and to reduce a current ripple of the output current, so as to generate a load current which is supplied to a load circuit, wherein the load circuit is coupled between the load node and the reference node, and the current source circuit is coupled between the output node and the load node.

A self-healing overtemp circuit is described and illustrated comprising a temperature sensing circuit, a voltage sensing circuit, and optionally, a current sensing circuit. The self-healing overtemp circuit is designed to ramp down power in an LED lighting system (or other electrical circuit) in response to a sensed or impending thermal runaway (and optionally, overcurrent) event. Said thermal runaway and overcurrent events may be a result of failure of one or more components (e.g., driver, active cooling means) of the lighting system. The self-healing overtemp circuit further comprises means of restoring power to said LEDs in a manner that avoids (i) a perceivably bright flash of light or (ii) increased risk of component failure.