Abstract: A multi-lamp driving circuit includes a power supply, a booster converter including a first winding and a second winding, a plurality of current balance circuits and a plurality of balance converters. The first winding of the booster converter is coupled to the power supply. Each of the current balance circuits includes a plurality of current balance sub-circuits each including a capacitor and a lamp connected in series. One end of each of the current balance sub-circuits is connected to one end of the second winding of the booster converter. A first winding of each of the balance converters is electrically connected between the other end of the second winding of the booster converter and the other end of the current balance sub-circuits of corresponding current balance circuits. Second windings of the balance converters are connected in series.

Abstract: A multi-lamp driving circuit for driving a plurality of lamp groups includes an inversion circuit configured to drive the plurality of lamp groups and a current balance circuit electrically connected between the inversion circuit and the plurality of lamp groups. The current balance circuit includes a plurality of transformers, each including a first magnetic loop composed of a first primary winding and a first secondary winding and a second magnetic loop composed of a second primary winding and a second secondary winding. Numbers of turns of the second primary winding and the second secondary winding of each of the plurality of transformers are equivalent, and numbers of turns of the first primary winding and the first secondary winding of each of the plurality of transformers are equivalent.

Abstract: A backlight driving system comprises an inverter module, a current balance module, a feedback module and an open-lamp protection detection module. The inverter module provides electrical signals to a plurality of lamps. The current balance module balances currents flowing through the plurality of lamps. The feedback module detects the current of the backlight and generates a feedback signal to the invert module accordingly. The open-lamp protection detection module detects voltage variations of the feedback transformer and generates a detection signal to the inverter module accordingly. The inverter module regulates the currents flowing through the plurality of lamps according to the feedback signal and determines one or more of the plurality of lamps are faulty according to the detection signal generated by the open-lamp protection detection module, and stops providing the electrical signals to the plurality of lamps.

Abstract: A light source driving device for driving a light source includes a power stage circuit, a transformer circuit, a control circuit, and a fault detecting circuit. The power stage circuit converts an external electrical signal to an alternating current (AC) signal. The transformer circuit is connected between the power stage circuit and the light source to convert the AC signal to a high voltage electrical signal adapted for driving the light source. The fault detecting circuit detects whether the light source is nonfunctional, and outputs a fault signal upon the condition that the light source is nonfunctional. The fault detecting circuit includes a voltage level comparison circuit and a variable-benchmark voltage circuit. The control circuit is connected between the fault detecting circuit and the power stage circuit to output a control signal to the power stage circuit based on the fault signal.

Abstract: A multi-lamp driving circuit for driving a plurality of lamps includes at least one power stage circuit, at least one transformer circuit, a balancing circuit, and a control circuit. The power stage circuit converts external electrical signals to alternating current (AC) signals. The transformer circuit is connected to the power stage circuit, to convert the AC signals to high voltage electrical signals capable of driving the lamps. The balancing circuit balances current flowing through the lamps, and includes a capacitor balancing circuit and a transformer balancing circuit. The control circuit is connected between the balancing circuit and the power stage circuit, to control output of the power stage circuit according to variation of the current flowing through the lamps.

Abstract: A dual-lamp driving circuit includes a first frequency switch control circuit, a second frequency switch control circuit, a pulse-width modulation (PWM) control circuit, a first power stage circuit, a second power stage circuit, a conversion circuit, and a feedback circuit. The first frequency switch control circuit receives a first enable signal, and outputs a first frequency switch signal according to the first enable signal. The second frequency switch control circuit receives a second enable signal, and outputs a second frequency switch signal according to the second enable signal. The PWM control circuit outputs various PWM control signals according to the first frequency switch signal and the second frequency switch signal. The feedback circuit feeds back a first current signal from the first lamp to the frequency switch control circuit, and a second current signal from the second lamp to the frequency switch control circuit.

Abstract: A backlight driving system driving a plurality of lamp groups comprises a phase controller, a pulse width module (PWM) controller, a plurality of power stages, a plurality of transformers and a plurality of switch circuits. The phase controller generates a plurality of phase signals. The PWM controller generates PWM signals. The power stages receive and convert direct current (DC) signals from an external power source to alternative current (AC) signals under the control of the PWM signals. The transformers receive and boost up the AC signals from the power stages to drive the lamp groups. The switch circuits alternatively transmit the DC power signals from the external power source and the PWM signals from the PWM controller to the power stages so as to control outputs of the power stages.

Abstract: A power device transforms input power into power for output, and includes an input unit, a power factor unit, a first electronic switch, an output unit, and a control signal port. The power factor unit includes a power factor correction circuit and a first detection circuit connected to an output end of the power factor unit and the power factor correction circuit. The first electronic switch is connected to the first detection circuit, and is under control of the control signal port.

Abstract: A power device transforms input power into power for output, and includes an input unit, a power factor unit, an output unit, a power saving unit, and a control signal port. The power saving unit includes a first electronic switch, a first diode and a single-direction switch. The first electronic switch is connected between the input unit and the power factor unit. An anode of the first diode is connected to the input unit, and a cathode of the first diode is connected to the output unit. The single-direction switch is connected to the power factor unit and the output unit to block current from the output unit to the power factor unit. The control signal port controls an on/off state of the first electronic switch.

Abstract: A system for driving a plurality of lamps may monitor the faults of the lamps by detecting the voltage variance of the first, second and third detecting resistors connected to the low voltage ends of the first and second secondary winding for providing the power to the lamps.

Abstract: A bobbin includes a first winding frame to wrap primary winding coils thereon, a first winding chassis defining a first opening to receiving the first winding frame therein, a pair of second winding chassis positioned at two opposite ends of the bobbin and each defining a second opening, a pair of second winding frames received in the second openings of the second winding chassis to wrap secondary winding coils thereon, and a receiving hole extending through the second winding chassis and the first winding frame. The first winding frame is positioned between the second winding chassis. Each of the second winding frames defines a through hole communicating with the receiving hole. The first opening of the first winding chassis faces to a first direction, and each of the second openings of the second winding chassis faces to a second direction different from the first direction.

Abstract: An electrical device includes a conductive member and a voltage-resistant connector to be mounted to the metal enclosure. The conductive member such as a metal enclosure, includes a pair of clasping portions separated from each other. Each of the pair of clasping portions includes a pair of fixing arms. The voltage-resistant connector includes a main body to electrically connect a high-voltage output and a load of the electrical device, and an insulated member between the main body and the conductive member to increase a beeline distance between the voltage-resistant connector and the insulated member to avoid arcing therebetween. The insulated member defines a pair of holes corresponding to the clasping portions. The pair of fixing arms of each of the pair of clasping portion extends through a corresponding hole and clasps the insulated member to fix the voltage-resistant connector on the conductive member.

Abstract: A bobbin includes a first winding frame to wrap primary winding coils thereon, a first winding chassis defining a first opening to receiving the first winding frame therein, a pair of second winding chassis positioned at two opposite ends of the bobbin and each defining a second opening, a pair of second winding frames received in the second openings of the second winding chassis to wrap secondary winding coils thereon, and a receiving hole extending through the second winding chassis and the first winding frame. The first winding frame is positioned between the second winding chassis. Each of the second winding frames defines a through hole communicating with the receiving hole. The first opening of the first winding chassis faces to a first direction, and each of the second openings of the second winding chassis faces to a second direction different from the first direction.

Abstract: A transformer includes a bobbin and a core assembly. The bobbin includes a pair of first winding portions to wrap primary winding coils thereon and a second winding portion between the pair of first winding portions to wrap secondary winding coils thereon. The core assembly includes a first core and a second core. At least one gap is formed between the first core and the second core at opposite sides of the second winding portion to adjust leakage inductance of the transformer. The gaps and the winding coils of the second winding portion are positioned in a same magnetic circuit, the magnetic circuit generating the leakage inductance of the transformer.

Abstract: A high voltage transformer employed in an inverter includes a first core and a second core. The second core is coupled to the first core. One end of the second core is wrapped by a primary winding, and the other end thereof is wrapped by a secondary winding. A conductive coefficient of the first core is at least 100 times of that of the second core.

Abstract: A discharge lamp driving device includes a power stage circuit, a transformer circuit, a control circuit, a feedback circuit and a lamp protection circuit. The lamp protection circuit includes a current sensing circuit, a reference voltage selecting circuit, a comparing circuit and a protection signal generating circuit. The current sensing circuit senses current signals flowing through the lamps, and transforms the current signals to voltage signals. The reference voltage selecting circuit is connected to the current sensing circuit. The comparing circuit is connected to the current sensing circuit and the comparing circuit. The protection signal generating circuit is connected between the comparing circuit and the control circuit. The control circuit is connected to the comparing circuit.

Abstract: A backlight module positioned on a printed circuit board (PCB) includes a power control circuit, a transformer, and a voltage detection component. The power control circuit outputs power signals. The transformer has a primary winding and at least one secondary winding. The primary winding is connected to the power control circuit and receives the power signals. The voltage detection component is positioned on a high voltage terminal of the secondary winding of the transformer, detecting voltage variations in the high voltage terminal of the secondary winding of the transformer, and outputting the detected voltage variation to the power control circuit. The power control circuit adjusts the output power signals according to the detected voltage variation.

Abstract: An inverter circuit drives a light source module. An input signal circuit provides electrical signals. A power stage circuit converts the electrical signals to square-wave signals. A transformer circuit converts the square-wave signals to alternating current (AC) signals capable of powering the light source module. A voltage detection circuit detects voltage applied on the light source module so as to output a detected voltage signal. A feedback circuit feeds current flowing through the light source module so as to output a current feedback signal. A protection circuit is connected to the voltage detection circuit and the feedback circuit, for outputting a latch signal according to the detected voltage signal or the current feedback signal. A pulse-width modulation control circuit outputs a switch signal to the power stage circuit according to the latch signal. The input signal circuit also provides the electrical signals to the protection circuit.

Abstract: A lamp control system driving at least two discharge lamps according to at least two control instructions includes a control circuit, a switch circuit, a transformer resonance circuit, and a source transformer circuit. The control circuit generates a control signal to which the source transformer circuit is electrically connected, transforming the control signal to at least one alternating current (AC) signal, and the transformer resonance circuit is electrically connected to the source transformer circuit and the discharge lamps, transforming the at least one AC signal to one or more electrical signals to respectively drive one or more discharge lamps, the switch circuit, electrically connected to the source transformer circuit and the transformer resonance circuit, drives source transformer circuit output of the at least one AC signals to the transformer resonance circuit.

Abstract: A light source driving device drives a plurality of light sources. A Power Factor Circuit (PFC) circuit converts a received electrical signal to a DC signal and output to a DC/AC converting circuit. The DC/AC converting circuit converts the DC signal to another AC signal, which is isolated by the transformer circuit. A resonance balancing circuit converts the AC signal output from the transformer circuit to another AC signal to drive the light source module. A PWM dimming controller outputs a control signal to control output of the DC/AC converting circuit according to a received dimming signal, wherein duty cycle of the control signal is fixed. A voltage dividing circuit adjustably divides voltage of the DC signal output from the PFC circuit. A PFC controller feeds the divided signal back to the PFC circuit to control the DC signal output from the PFC circuit.