Abstract: The provided switching power supply includes an auxiliary circuit having an auxiliary switch and a auxiliary capacitor, a transformer having a primary side coupled to the auxiliary circuit in parallel and a secondary side, an auxiliary switch control circuit coupled to the auxiliary switch and the primary side and fixing a turn-on time of the auxiliary switch, a main switch coupled to the primary side, a ZVS detector coupled to the main switch, a first and a second rectifying switches coupled to the secondary side and a filter circuit coupled to the second rectifying switch in parallel. The provided method includes the steps of: (a) fixing the turn-on time of the auxiliary switch; and (b) generating a fixed turn-off time of the main switch accordingly so as to accomplish ZVS of the main switch.

Abstract: The configurations of an isolated DC/DC converter and an isolated DC/AC converter and the controlling methods thereof are provided. The proposed isolated DC/DC converter includes a DC/AC switching device, a transformer, a rectifier, and a duty ratio and frequency modulating apparatus coupled to the rectifier and the DC/AC switching device for generating a driving signal to adjust a duty ratio and a frequency of the switching device so as to regulate an output DC voltage of the converter.

Abstract: A transformer structure is disclosed. The transformer structure comprises a main body, a primary winding coil, a secondary winding coil, a first winding portion, a second winding portion and a magnetic core assembly. The main body has a first side, a second side, at least a through hole, a first receiving chamber communicating with the first side, a second receiving chamber communicating with the second side, and a separating wall disposed between the first receiving chamber and the second receiving chamber. The first winding portion for winding the primary winding coil thereon is disposed in the first receiving chamber and has a first channel communicating with the through hole. The second winding portion for winding the secondary winding coil thereon is disposed in the second receiving chamber and has a second channel communicating with the through hole.

Abstract: A transformer having auxiliary winding coils for sensing magnetic flux balance is disclosed. The transformer comprises a first winding part having a first channel, a second winding part having a second channel a third winding part having a third channel, a primary winding coil wound around the first winding part, a first secondary winding coil wound around the second winding part, a second secondary winding coil wound around the third winding part, a first auxiliary winding coil for sensing magnetic flux balance wound around the second winding part, a second auxiliary winding coil for sensing magnetic flux balance wound around the third winding part, and a magnetic core assembly having a first extension part disposed in the first channel, a second extension part disposed in the second channel, and a third extension part disposed in the third channel.

Abstract: The present invention presents a driving circuit for illuminating multiple discharge lamps. The inventive driving circuit is configured to illuminate multiple discharge lamps by using trace-to-trace capacitances embedded in the circuit board to resonate with the leakage inductance of the transformer, in which the trace-to-trace capacitances are connected to the secondary side of the transformer and respectively connected in series with a discharge lamp. Also, the inventive driving circuit includes a protection device for detecting the currents flowing through multiple discharge lamps by trace-to-trace capacitances, and thereby preventing the multiple discharge lamps from the damages as a result of the current unbalance between the multiple discharge lamps.

Abstract: Presented is a driving circuit for multiple discharge lamps, including a plurality of transformers having a plurality of primary windings and secondary windings, in which each secondary winding is connected in series with a resonance circuit and each resonance circuit is coupled to a discharge lamp. The driving circuit further includes an additional resonance inductor coupled to the primary side of the transformers for increasing the resonance inductance of the resonance circuit and allowing the resonance inductance of the resonance circuit to be modulated in response to the variation of the impedance of the discharge lamp or the variation of the impedance of the resonance capacitor of the resonance circuit.

Abstract: A power supply system is used for driving the lamps. The power supply system includes an inverter, a transformer and a resonant circuit. The inverter is electrically connected to a DC power source for converting a DC voltage into an AC voltage. The transformer includes a primary winding coil and a secondary winding coil. The primary winding coil is electrically connected to the inverter for receiving the AC voltage, so that the output voltage of the secondary winding coil is boosted. The resonant circuit is electrically connected to the secondary winding coil and includes a plurality of high voltage-resistant capacitors. The high voltage-resistant capacitors are coupled to both terminals of the secondary winding coil. The leakage inductance of the transformer and the high voltage-resistant capacitors of the resonant circuit cooperatively result in a resonant effect, thereby generating a sinusoidal alternating voltage to drive the lamps.

Abstract: A transformer includes a first winding member, a second winding member, a primary winding coil, a secondary winding coil and a magnetic core assembly. The first winding member has a first channel penetrating therethrough. The second winding member has a second channel penetrating therethrough and includes a covering part. The covering part has a receptacle communicating with the second channel. The primary winding coil is wound on the first winding member. The secondary winding coil is wound on the second winding member. The magnetic core assembly is partially embedded into the first and the second channels. The combination of the first winding member and the primary winding coil wound on the first winding member is accommodated within the receptacle, such that the primary winding coil and the secondary winding coil are separated from each other by the covering part and the first channel communicates with the second channel.

Abstract: A transformer structure is disclosed. The transformer structure comprises a main body, a primary winding coil, a secondary winding coil, a first winding portion, a second winding portion and a magnetic core assembly. The main body has a first side, a second side, at least a through hole, a first receiving chamber communicating with the first side, a second receiving chamber communicating with the second side, and a separating wall disposed between the first receiving chamber and the second receiving chamber. The first winding portion for winding the primary winding coil thereon is disposed in the first receiving chamber and has a first channel communicating with the through hole. The second winding portion for winding the secondary winding coil thereon is disposed in the second receiving chamber and has a second channel communicating with the through hole.

Abstract: A transformer having auxiliary winding coils for sensing magnetic flux balance is disclosed. The transformer comprises a first winding part having a first channel, a second winding part having a second channel a third winding part having a third channel, a primary winding coil wound around the first winding part, a first secondary winding coil wound around the second winding part, a second secondary winding coil wound around the third winding part, a first auxiliary winding coil for sensing magnetic flux balance wound around the second winding part, a second auxiliary winding coil for sensing magnetic flux balance wound around the third winding part, and a magnetic core assembly having a first extension part disposed in the first channel, a second extension part disposed in the second channel, and a third extension part disposed in the third channel.

Abstract: A transformer structure is disclosed. The transformer comprises a primary winding coil, plural secondary winding coils, a first winding portion, plural second winding portions, plural partition plates, a channel, and a magnetic core assembly. The first winding portion is used for winding the primary winding coil thereon, and the plural second winding portions are used for winding the secondary winding coils thereon and disposed at two sides of the first winding portion. The plural partition plates are disposed between the first winding portion and the second winding portions, respectively, and each the partition plate has a slot. The channel penetrates the first winding portion, the second winding portions and the partition plates. The magnetic core assembly comprises an I-shaped magnetic core and a U-shaped magnetic core. The I-shaped magnetic core is received in the channel and the U-shaped magnetic core has plural protrusions inserted into the slots of the partition plates.

Abstract: A transformer includes a primary winding coil, a plurality of electrically-conductive sheets, a bobbin and a magnetic core assembly. The bobbin includes a first tube member, a second tube member and plural partition plates. The first tube member and the second tube member have a first channel and a second channel therein, respectively. Each partition plate is sheathed around the first tube member and the second tube member and includes a receptacle for accommodating respective electrically-conductive sheet, and the primary winding coil is wound around the second tube member.

Abstract: The provided switching power supply includes an auxiliary circuit having an auxiliary switch and a auxiliary capacitor, a transformer having a primary side coupled to the auxiliary circuit in parallel and a secondary side, an auxiliary switch control circuit coupled to the auxiliary switch and the primary side and fixing a turn-on time of the auxiliary switch, a main switch coupled to the primary side, a ZVS detector coupled to the main switch, a first and a second rectifying switches coupled to the secondary side and a filter circuit coupled to the second rectifying switch in parallel. The provided method includes the steps of: (a) fixing the turn-on time of the auxiliary switch; and (b) generating a fixed turn-off time of the main switch accordingly so as to accomplish ZVS of the main switch.

Abstract: A high-voltage detecting circuit for saving power in a standby mode is provided. The high-voltage detecting circuit includes a high-voltage detecting module, a switch module and a control module. The high-voltage detecting module is composed of several resistors for detecting a high-voltage power supply. A control terminal of the control module is controlled by the power supply to switch off the switch module when the power supply stays at the standby mode, ensuring that the power loss of the high-voltage detecting module is eliminated.

Abstract: A switching power supply is provided. The switching power supply includes an auxiliary circuit, a transformer having a primary side connected with said auxiliary circuit in parallel and a secondary side, a main switch having one end connected with the primary side of the transformer and a control terminal, a primary side controller connected with the control terminal of the main switch, a first rectification switch and a second rectification switch coupled with the secondary side of the transformer. The second rectification switch has a control terminal, a secondary side controller having a first end connected with the secondary side of the transformer and a second end connected to the control terminal of the second rectification switch, and a filtering circuit connected to the second rectification switch in parallel.

Abstract: A transformer includes a first winding member, a second winding member, a primary winding coil, a secondary winding coil and a magnetic core assembly. The first winding member has a first channel penetrating therethrough. The second winding member has a second channel penetrating therethrough and includes a covering part. The covering part has a receptacle communicating with the second channel. The primary winding coil is wound on the first winding member. The secondary winding coil is wound on the second winding member. The magnetic core assembly is partially embedded into the first the second channels. The combination of the first winding member and the primary winding coil wound on the first winding member is accommodated within the receptacle, such that the primary winding coil and the secondary winding coil are separated from each other by the covering part and the first channel communicates with the second channel.

Abstract: A transformer structure is proposed herein which includes a primary winding coil, a secondary winding coil, a bobbin module, and a magnetic core assembly. The magnetic core assembly is mounted within the bobbin module. The bobbin module includes a first winding window portion and a second winding window portion in which the first winding window portion allows the primary winding coil to be wound thereupon and the second winding window portion allows the secondary winding coil to be wound thereupon. Both of first winding window portion and the second winding window portion include a first lateral plate, and each couples or separate with each other by the first lateral plate, such that the primary winding coil and the secondary winding coil are separated with each other and the leakage inductance, and the safe distance of electrical security for the transformer is increased accordingly.

Abstract: A voltage adapter characterized by an advantage of reducing unnecessary power loss induced in standby mode operation and conserving the overall power consumption accordingly. The voltage adapter according to the present invention receives an input voltage and converts the input voltage into an output voltage having a voltage level different from the input voltage, and comprises an EMI filter for suppressing a differential mode noise in the input voltage, a bridge rectifier for performing a full-wave rectification to the input voltage, a transistor switch, a driver for controlling on/off operations of the transistor switch according to a feedback amount derived from the output voltage, and a circuit box for providing a discharge path for the EMI filter, while sampling the input voltage to detect a variation of the input voltage.

Abstract: A current detecting circuit for use in a power converter having a control circuit, a switching circuit, a transformer and an energy storage element is disclosed. The current detecting circuit comprises a filter, a rectifier and a differentiator. The filter is electrically connected to the energy storage element for receiving a voltage signal from the energy storage element and filtering the voltage signal to obtain an alternating voltage change value. The rectifier is electrically connected to the filter for rectifying the alternating voltage change value to obtain a half-sine wave voltage change value. The differentiator is electrically connected to the rectifier and the control circuit for performing a differential operation on the half-sine wave voltage change value to obtain a current change value of the energy storage element.

Abstract: A voltage detecting circuit including an impedance converter, an energy storage element, a current source and a comparing circuit is disclosed. The impedance converter is used for converting a high impedance voltage signal into a low impedance voltage signal. The energy storage element is electrically connected to the impedance converter, and receives the low impedance voltage signal. The current source is electrically connected to the energy storage element, and provides a discharging path of the energy storage element. The comparing circuit is electrically connected to the current source, and receives a voltage signal from the energy storage element. The voltage signal is compared with a predetermined reference voltage value stored in the comparing circuit so as to dynamically control operation of the power converter according to the comparing result.