A power supply system uses a DC-DC power converter (28) for supplying an output load. A compensation circuit (40) is connected between the input to the DC-DC converter and the output of the DC-DC converter and it provides a compensating path in response to a voltage drop at the output of the DC-DC converter caused by a surge in the output load. The power supply system further comprises a low drop out regulator (30) as the output load, which low drop out regulator (30) having an input connected to the DC-DC power converter and the compensation circuit, and an output connected to an output terminal (C) for connection to a further output load. This enables the DC-DC power converter to have a low current capability, because a large current demand can be met by the DC supply to the DC-DC converter.

A protection system for an LED driver includes a voltage rail, an input voltage source, and a surge protector connected between the input voltage source and the voltage rail. The voltage change sensing block detects a change in a voltage associated with the input voltage source. The protection system further includes a voltage sensing block connected to the voltage change sensor. A half-bridge switching circuit may include a switch controller, a first switching element, and a second switching element. The switch controller controls an operating state of each of the first switching element and the second switching element. A reset block disables at least one of the switch controller, the first sensing element, and the second switching element, responsive to a control signal associated with at least one of the voltage change sensing block and the voltage sensing block.

A dimmable ballast circuit for a compact fluorescent lamp controls the intensity of a lamp tube in response to a phase-control voltage received from a dimmer switch. The ballast circuit comprises a phase-control-to-DC converter circuit that receives the phase-control voltage, which is characterized by a duty cycle defining a target intensity of the lamp tube, and generates a DC voltage representative of the duty cycle of the phase-control voltage. Changes in the duty cycle of the phase-control voltage that are below a threshold amount are filtered out by the converter circuit, while intentional changes in the duty cycle of the phase-control voltage are reflected in changes in the target intensity level and thereby the intensity level of the lamp tube.

A lighting unit having a microcontroller; and a near field communication (NFC)-enabled embedded device comprising NFC shared memory configured to be written to by both an external NFC reader/writer using near field communication and the microcontroller and configured to enable an operation of the lighting unit to be both monitored and controlled using NFC. In this manner, the operation of a lighting unit may be monitored using NFC and controlled by using one of two approaches, such as via a microcontroller within the lighting unit and/or a near field communication, NFC, via the NFC-enabled embedded device; wherein the microcontroller is configured to manage a communication protocol to facilitate communications between the lighting unit and at least one other NFC-enabled device.

A circuit for conduction testing of a power supply of a plasma globe lamp includes a rectifying circuit and a switching power supply, the circuit for conduction testing of the power supply of the plasma globe lamp is connected with an alternating current output end of an external power supply, a first end of the rectifying circuit is connected with the alternating current output end of the external power supply, a second end of the rectifying circuit is connected with the switching power supply, and the rectifying circuit is configured to convert an alternating current output by the alternating current output end into a direct current and to output the direct current to the switching power supply, and the rectifying circuit includes at least two diodes and a substrate, and all the at least two diodes are integrated in the substrate.

In a projector, a reflection mirror configured to reflect light emitted from a discharge lamp is disposed on a first end of a discharge lamp main body, a first electrode is disposed on the first end side, each of a first AC period and a second AC period alternately includes a first polarity period in which the first electrode serves as an anode and a second polarity period in which a second electrode serves as an anode, a controller causes a period to transition from the first AC period to the second AC period in a case where an input reception unit receives a stop operation on the projector, and an absolute value of a driving current of the second polarity period in the second AC period is greater than an absolute value of the driving current of the second polarity period in the first AC period.

The present invention discloses a multi-zone active-matrix temperature control system, the control system having a temperature control matrix and a gate driver; the temperature control matrix comprising: N*M temperature control modules forming a N-row M-column matrix, a power supply line, and a power return line; each temperature control module comprising: a temperature control unit adapts to be heated up by electrical power for temperature controlling; a semiconductor switch provided with a gate electrode connected with the gate driver, two ends of the gate, which turn on or off, being connected with the power supply line, and with the power return line through the temperature control unit, respectively. In the temperature control matrix, one ends, which are connected with a power return line, of the temperature control units of temperature control modules in a same row or same column are serially connected, and connected with the power supply line; one ends, which are connected with the power supply line, of the semiconductor switches of the temperature control modules at a same row or a same column are serially connected, and connected with the power supply line. The present invention may precisely perform temperature control to each zone of the electrostatic chuck and significantly reduces the number of electrostatic chuck lead-out lines.

A discharge lamp driving device includes: a discharge lamp drive unit configured to supply a drive current to a discharge lamp having two electrodes; a voltage detection unit configured to detect an inter-electrode voltage of the discharge lamp; and a control unit configured to control the discharge lamp drive unit, wherein the control unit executes first measurement drive in which a polarity of the drive current is maintained constant at a first polarity, the voltage detection unit measures the inter-electrode voltage multiple times in a first measurement period in which the first measurement drive is executed, and the control unit determines states of the electrodes of the discharge lamp based on a plurality of the inter-electrode voltages measured in the first measurement period.

A power supply system uses a DC-DC power converter (28) for supplying an output load. A compensation circuit (40) is connected between the input to the DC-DC converter and the output of the DC-DC converter and it provides a compensating path in response to a voltage drop at the output of the DC-DC converter caused by a surge in the output load. The power supply system further comprises a low drop out regulator (30) as the output load, which low drop out regulator (30) having an input connected to the DC-DC power converter and the compensation circuit, and an output connected to an output terminal (C) for connection to a further output load. This enables the DC-DC power converter to have a low current capability, because a large current demand can be met by the DC supply to the DC-DC converter.

A dimmable instant-start ballast for a plurality of LED lamps and/or a plurality of fluorescent lamps is provided, which includes an isolated dimming interface, a duty control device, a dimming switch, and an inverter circuit. The isolated dimming interface receives a dimming signal to generate a dimming voltage. The duty control device generates an operation signal according to the dimming voltage. The dimming switch periodically couples a first node to a ground according to the operation signal. The inverter circuit receives a rectified voltage and is coupled to the first node. When the first node is coupled to the ground terminal, the inverter circuit provides a lamp current for the LED lamps and/or the fluorescent lamps.