Ampower Technology Co., Ltd.

Hon Hai Precision Industry Co., Ltd.

Chia-Kun Chen

Chih-Chan Ger

Chi-Chang Lu

Chia-Peng Wang

Chih-Chang Chang

Chi-Wen Kan

Tzu-Chiang Mi

A bypass protection circuit connected to a light emitting diode (LED) group in parallel, comprises a switch circuit and a capacitor. The switch circuit comprises a plurality of switch components, an abnormal detection module and a switch control module. The abnormal detection module detects voltage of the LEDs respectively, and determines which one is broken and outputs an abnormal signal. The switch control module controls a switch component connected to the broken LED in parallel on/off according to the abnormal signal. The capacitor is charged by driving signals of the LEDs when the LEDs are operated according to a normal working mode or a first status of a burst dimming mode, and is discharged to maintain an operating power of the switch circuit when the LEDs are operated according to a second status of the burst dimming mode.

Bypass protection circuit and light emitting diode driving device using the same

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.

Power supply device with low standby power consumption

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.

A light source driving device includes a power factor correction (PFC) circuit, a power stage circuit, a power conversion circuit, a balancing circuit, an inverter control signal processor, an inverter controller and an isolation component. Alternating current (AC) signals are converted into electrical signals to drive lamps via the PFC circuit, the power stage circuit, the power conversion circuit and the current balancing circuit. The power conversion circuit including a transformer divides the driving device into a primary side and a secondary side. The inverter control signal processor receives a first control signal output from a secondary side and generates a second control signal. The inverter controller is disposed on the secondary side to drive the power stage circuit. The isolation component transmits the second control signal to the inverter controller and isolates the inverter control signal processor from the inverter controller.

Light source driving device

A fault detection circuit connects to and determines the occurrence of failure in an inverter circuit. The inverter circuit comprises three outputs to connect three groups of lamps respectively, and the fault detection circuit comprises a magnetic unit and a signal detection unit. The magnetic unit comprises first, second and third flux generating windings electrically connected to the three outputs of the inverter circuit, and a flux detection winding. If no fault occurs on the outputs of the inverter circuit, total flux generated by the flux generating windings is cancelled out. As long as any fault occurs on the outputs of the inverter circuit, flux generated by the flux generating windings cannot be canceled out, and the flux detection winding is electromagnetically coupled accordingly and driven by the generated flux to output a coupling signal, based on which the signal detection unit generates an alert signal accordingly.

Fault detection circuit

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.

Transformer with leakage inductance

A system for driving a plurality of lamps comprises a lamp module, an inverter circuit providing currents to the lamp module, an interface for conveying the currents, a splitter, a balance unit, and a fault detecting circuit. The splitter receives the currents provided by the inverter circuit through the interface and distributing the currents to the plurality of lamps. The balance unit balances the currents provided to the plurality of lamps in the lamp module. The fault detecting circuit detects and reports a condition of at least one of the lamps by detecting signals generated from the inverter circuit. The fault detecting circuit receives the signal from a point in the system, such that the fault detecting circuit can detects the signals before the signal undergoes the distributing by the splitter.

System for driving a plurality of lamps

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.

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.

Transformer with separated bobbin

A system for driving a plurality of lamps includes an inverter circuit () and a fault detecting circuit (). The inverter circuit includes a plurality of outputs divided into a first output part and a second output part. The fault detecting circuit is used for detecting whether one or more of the plurality of outputs of the inverter circuit is faulty, and includes a magnetic element circuit () and a signal detecting circuit (). The magnetic element circuit is used for generating an induction signal according to flux changes of the magnetic element circuit when one of the plurality of outputs is faulty. The signal detecting circuit is used for generating a fault signal according to the induction signal.

System for driving a plurality of lamps and fault detecting circuit thereof

A driving device for driving discharge lamps () includes a first pulse circuit (), a second pulse circuit (), and a primary driving circuit (). The first pulse circuit includes an input end, a first output end (), and a second output end (). The second pulse circuit includes an input end, a third output end (), and a fourth output end (). The primary driving circuit is connected between the first pulse circuit and the second pulse circuit for generating drive signals. The second output end of the first pulse circuit is connected to the third output end of the second pulse circuit, and the fourth output end of the second pulse circuit is connected to ground.

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Jhongli, Taiwan

Chia-Kun Chen