Patent application number | Description | Published |
20100109736 | ELECTRONIC DEVICE AND SQUARE WAVE GENERATOR THEREOF - A square wave generator includes a sawtooth wave generator and a convertor. The sawtooth wave generator generates a sawtooth wave. The convertor generates a square wave based on the sawtooth wave. The sawtooth wave generator includes a capacitor and a switching unit connected parallel to each other. A first terminal of the capacitor is electrically coupled to a power source and the convertor, and a second terminal of the capacitor is grounded. When a voltage drop on the capacitor equals to or is greater than a first threshold voltage, the switching unit closes and grounds the first terminal of the capacitor, so that the capacitor discharges rapidly. | 05-06-2010 |
20100124078 | ELECTRONIC DEVICE AND POWER SUPPLY THEREOF - A power supply includes a first convertor, a second convertor, and a transformer. The first convertor generates an alternating current (AC) voltage. The transformer includes a primary winding and a secondary winding. The primary winding is connected to the first convertor and receives the AC voltage. The secondary winding includes a first tap, a second tap, and a third tap disposed between the first tap and the second tap. The second convertor includes a first rectifier circuit connected to the first tap and the second tap, and a second rectifier circuit connected to the third tap. The first rectifier circuit generates a first direct current (DC) voltage. The second rectifier circuit generates a second DC voltage. | 05-20-2010 |
20100177539 | ELECTRICAL APPLIANCE AND POWER SUPPLY THEREOF - A power supply includes an adapter and a delay module. The adapter is operable to receive an input voltage and convert the input voltage into a first operation voltage to power a load controlled by a control unit. The adapter includes a filter capacitor configured to smooth the first operation voltage. The delay module detects the input voltage, and supplies a second operation voltage to the control unit when receiving the input voltage. The delay module continues supplying the second operation voltage to the control unit for a predetermined time period after the input voltage is no longer supplied to the adapter. As a result, the load operates for at most the predetermined time period and the filter capacitor discharges via the load after the input voltage is removed. | 07-15-2010 |
20100225298 | TRANSFORMATION CIRCUIT AND ELECTRONIC DEVICE USING SAME - A transformation circuit includes a bidirectional switch, a capacitor, and a triac. A first electrode of the triac is for receiving an input alternating current (AC) voltage. A second electrode of the triac is for outputting a transformed AC voltage. A control electrode of the triac is electrically connected to one terminal of the bidirectional switch, and the other terminal of the bidirectional switch is electrically connected to one terminal of the capacitor, and the other terminal of the capacitor is electrically connected to the first electrode of the triac. When the capacitor is charged or discharged, the bidirectional switch is switched on or off, and the triac is triggered on or off accordingly, such that a duty cycle of the input AC voltage is changed to form the transformed AC voltage. | 09-09-2010 |
20100232185 | POWER SUPPLY MODULE - A power supply module includes an AC/DC converter, a voltage transforming circuit, a feedback circuit, and a detecting circuit. The AC/DC converter is used for converting the input AC voltage to a primary DC voltage. The voltage transforming circuit is used for transforming the primary DC voltage to the first DC voltage. The feedback circuit is used for sampling the first DC voltage to generate a feedback signal. The detecting circuit is used for detecting if the power supply module is powered on, and generating a first voltage when detecting that the power supply module is powered on. Wherein the voltage transforming circuit maintains the first DC voltage at a first predetermined value according to the feedback signal, the feedback circuit increases a magnitude of the feedback signal according to the first voltage. | 09-16-2010 |
20100246229 | POWER SUPPLY MODULE - A power supply module is configured for converting an AC voltage to a first DC voltage and applying the first DC voltage to a load. The power supply module includes a rectifying and filtering unit, a PFC unit, a voltage transforming unit, an input port, and a switch unit. The rectifying and filtering unit rectifies the AC voltage into a primary DC voltage and filters the primary DC voltage. The PFC unit corrects a power factor of the filtered primary DC voltage. The voltage transforming unit converts the corrected primary DC voltage and generates the first DC voltage for applying the load. The input port receives a first instruction or a second instruction and generates a first signal or a second signal, respectively. The switch unit establishes or disconnects an electrical connection between the voltage transforming unit and the load according to the first signal or the second signal. | 09-30-2010 |
20100254164 | POWER SUPPLY MODULE WITH FILTERING CIRCUIT AND POWER SUPPLY MODULE ASSEMBLY - A power supply module includes an AC/DC converter, a voltage transforming circuit, a feedback circuit, and a filtering circuit. The AC/DC converter is used for converting the AC voltage to a primary DC voltage. The voltage transforming circuit is configured for transforming the primary DC voltage to the first DC voltage. The voltage transforming circuit includes a transformer, the transformer includes a primary winding. The feedback circuit is coupled to the primary winding of the transformer and is configured for sampling a current flowing through the primary winding to generate a feedback signal; and the filtering circuit is structured and arranged for filtering any surge voltage transmitted from the feedback circuit to the voltage transforming circuit. Wherein the voltage transforming circuit maintains the first DC voltage at a predetermined value according to the feedback signal. A related power supply module assembly is also provided. | 10-07-2010 |
20100277953 | SWITCHING POWER SUPPLY - A switching power supply includes a switching unit, a driving signal generator, and a control circuit. The driving signal generator is configured for providing a driving signal including a plurality of acting voltage parts. The plurality of acting voltage parts is used to turn on the switching unit. Each of the acting voltage parts may be one of a high level voltage and a low level voltage. The control circuit is connected between the driving signal generator and the switching unit. The control circuit turns off the switching unit when a duration of one of the plurality of acting voltage parts is longer than a preset time period. | 11-04-2010 |
20100277959 | POWER SUPPLY MODULE - A power supply module includes a rectifying and filtering unit, a pulse width modulation (PWM) unit, a voltage transforming unit, a sampling and comparing unit, and an overvoltage protection unit. The rectifying and filtering unit receives an alternating current (AC) voltage, and generates a filtered primary DC voltage. The PWM unit is configured for generating pulses. The voltage transforming unit transforms the filtered primary DC voltage into the DC voltage according to the pulses. The sampling and comparing unit samples the DC voltage, and generates an overvoltage signal when the sampled DC voltage exceeds a predetermined DC voltage. The overvoltage protection unit is coupled between the sampling and comparing unit and the PWM unit. According to the overvoltage signal, the overvoltage protection unit generates a first control signal to disable the PWM unit, and the overvoltage protection unit is self-locked. | 11-04-2010 |