Patent application number | Description | Published |
20090080223 | FORWARD CONVERTER WITH SELF-DRIVEN SYNCHRONOUS RECTIFIERS - The present invention relates to a forward converter with self-driven synchronous rectifiers, which utilizes a secondary driving winding and a secondary driving circuit to drive the synchronous rectifiers in the secondary power loop. The secondary driving circuit, which is composed of a level shifter and a signal distributor, can shift the voltage waveform across the secondary driving winding by a predetermined level and distribute proper driving signals to the synchronous rectifiers to reduce the rectifier conduction loss. Specially, the channel of the freewheeling synchronous rectifier still can be turned on during the dead interval to further reduce the body diode conduction loss. | 03-26-2009 |
20090244933 | HALF-BRIDGE LLC RESONANT CONVERTER WITH SELF-DRIVEN SYNCHRONOUS RECTIFIERS - The present invention discloses a half-bridge LLC resonant converter with self-driven synchronous rectifiers, which utilizes a primary IC controller and a gate driver to drive the secondary synchronous rectifiers. In correspondence with the gate drive output voltages of the primary IC controller to the primary switch transistors, the gate driver for the secondary synchronous rectifiers comprises a differential transformer if the primary IC controller outputs two ground-referenced gate drive voltages, which cannot directly drive the primary switch transistors but can be imposed on the differential transformer; or comprises a DC shifter, a DC restorer and a differential transformer if the primary IC controller outputs two gate-source voltages, which can directly drive the primary switch transistors but cannot be imposed on the differential transformer. The drive voltages of the primary switch transistors are unipolar; however the drive voltage of the secondary synchronous rectifiers can be bipolar or unipolar. Under the valid operation mode, this converter can decrease the rectifier conduction losses to increase the power converter efficiency. | 10-01-2009 |
20100067275 | UNIDIRECTIONAL MOSFET AND APPLICATIONS THEREOF - Owing to the property of bidirectional conduction under the saturation mode, synchronous rectifiers in conventional power converters usually suffer from a reverse current under light loads or a shoot-through current under heavy loads. The reverse current may degrade the converter efficiency and the shoot-through current may damage synchronous rectifiers. The present invention discloses a unidirectional metal oxide semiconductor field effect transistor (UMOS), which comprises a metal oxide semiconductor field effect transistor (MOS), a current detection circuit and a fast turn-off circuit. The current detection circuit detects the direction of the current flowing through the MOS. When a forward current is detected, the fast turn-off circuit is disabled and the channel of the MOS can be formed. When a reverse current is detected, the fast turn-off circuit is enabled and the channel of the MOS cannot be formed. This UMOS can be applied, but not limited, to synchronous rectifiers to detect the occurrence of a reverse current or a shoot-through current and fast turn off the channel of the MOSFET. | 03-18-2010 |
20100123517 | GATE-CONTROLLED RECTIFIER AND APPLICATION TO RECTIFICATION CIRCUITS THEREOF - Conventional diode rectifiers usually suffer from a higher conduction loss. The present invention discloses a gate-controlled rectifier, which comprises a line voltage polarity detection circuit, a constant voltage source, a driving circuit and a gate-controlled transistor. The line voltage polarity detection circuit detects the polarity of the line voltage and controls the driving circuit to turn on or turn off the gate-controlled transistor. The gate-controlled transistor may be a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) with a gate, a source and a drain or an Insulated Gate Bipolar Transistor (IGBT) with a gate, an emitter and a collector. The constant voltage source is provided or induced by external circuits and referred to the source of the MOSFET or the emitter of the IGBT. Thanks to a lower conduction loss, this gate-controlled rectifier can be applied to rectification circuits to increase the rectification efficiency. | 05-20-2010 |
20100289461 | BRIDGELESS POWER FACTOR CORRECTOR WITH LOGIC CONTROL - The present invention discloses a bridgeless active power factor corrector with a logic control comprising a high frequency switch controller, a boost inductor, an output filtering capacitor, two boost transistor modules, two boost diodes, two AC input voltage polarity detectors, and two low frequency switch drivers. With a coupling signal, the two AC input voltage polarity detectors respectively control the two low frequency switch drivers in conjunction with the high frequency switch controller to drive the two boost transistor modules with a logic control so that the inductor current releasing electric energy from the boost inductor can flow through the channels of the two boost transistor modules to effectively reduce the body diode conduction loss. | 11-18-2010 |
20110013424 | FORWARD CONVERTER WITH SECONDARY SIDE POST-REGULATION AND ZERO VOLTAGE SWITCHING - The present invention discloses a forward converter with secondary side post-regulation and zero voltage switching, where the primary side power loop may adopt a single or a dual transistor structure, driven by a primary side driving circuit with a constant duty ratio so that the voltage waveform across the secondary side power winding has a constant pulse width; the secondary side power loop uses a controllable switch, a magnetic amplifier (MA) or an N channel metal oxide semiconductor field transistor (NMOS), to blank the leading edge of the voltage waveform across the secondary side power winding, regulate the output voltage, and achieve zero voltage switching of primary side switch transistors. | 01-20-2011 |
20140210351 | ELECTRONIC CONTROL GEARS FOR LED LIGHT ENGINE AND APPLICATION THEREOF - Disclosed are electronic control gears for LED light engines able to improve power factor by way of gearing up or down the LED current and the AC input current in response to and in synchronization with the AC input voltage. Moreover, the disclosed electronic control gears could further reduce flicker phenomenon and total harmonic distortion when used in collocation with disclosed valley fillers, filling the LED current valleys only during the dead time, and in conjunction with disclosed dummy loads, ramping up or down the AC input current only during the dead time. | 07-31-2014 |
20150163869 | CONTROL CIRCUITS, INTEGRATED CIRCUITS AND ILLUMINATING APPARATUSES HAVING THE SAME - Disclosed are control circuits capable of auto-configuring two LED arrays either in parallel when the two LED arrays are operating off of 100±20% V AC voltage sources or in series when the two LED arrays are operating off of 200±20% V AC voltage sources according to the detection of the AC input voltage magnitude. The disclosed control circuits, ruling over the parallel or series configuration of the two LED arrays, could be implemented in discrete forms or as integrated circuits (IC). | 06-11-2015 |
20150163875 | AC-POWERED LED LIGHT ENGINES, INTEGRATED CIRCUITS AND ILLUMINATING APPARATUSES HAVING THE SAME - An ac-powered LED light engine coupled between a rectifier and a plurality of extrinsic LED sub-arrays is provided. The ac-powered LED light engine comprises a plurality of normally closed bypass switches, a normally closed current regulator, and a plurality of switch controllers. Each of the normally closed bypass switches is connected in parallel with a corresponding LED sub-array except for the topmost or the bottommost LED sub-array and shuttles between three switch states: ON, REGULATION, and OFF. The normally closed current regulator is coupled to the normally closed bypass switches and used to regulate the highest LED current level near the peak of an extrinsic mains voltage. Each of the switch controllers is coupled to a corresponding bypass switch as a feedback network and takes control of the three switch states according to a corresponding current sense signal. | 06-11-2015 |
20150257225 | AC-POWERED LED LIGHT ENGINES, INTEGRATED CIRCUITS AND ILLUMINATING APPARATUSES HAVING THE SAME - Disclosed are novel AC-powered LED light engines for Solid State Lighting (SSL) able to achieve a high PF and a low THD without a traditional PFC. Getting rid of bulky, and costly magnetic components, short-life electrolytic capacitor, and EMI-causing fast switching, the disclosed AC-powered LED light engines ushers in a cost-effective, and energy-efficient LED driver design while eliminating the short-life electrolytic capacitor in an LED driver and reducing the Total Cost of Ownership (TOC). Thanks to no bulky components, the disclosed AC-powered LED light engines in a discrete or an integrated circuit form could be applied to the increasingly popular Driver-on-Board (DoB) design. Aside from being TRIAC-dimmable via legacy phase-cut dimmers, the disclosed LED light engines could also be made PWM-, analog-, or rheostat-dimmable with the incorporation of an appropriate dimming circuit to modulate the average LED current, adding more flexibility and versatility to dimming applications. | 09-10-2015 |
Patent application number | Description | Published |
20100207939 | Image Adjusting Apparatus and Associated Method - An image adjusting method for extending vertical blanking intervals of an image signal is provided. Using the image adjusting method, an adjusted image signal is synchronized with an image signal before the adjustment to prevent image delay. The image adjusting method comprises providing a first image signal having a first data enable signal, wherein the first data enable signal has a first data enable duration; and generating a second data enable signal having a second data enable duration. The first and second data enable durations correspond to a same image frame of an image signal, and the second data enable duration substantially overlaps the first data enable duration. | 08-19-2010 |
20100302133 | Apparatus for Controlling a Display and Method Thereof - An apparatus for controlling a display having a backlight module provided with a first set of units and a display panel provided with a second set of units is provided. In one embodiment, the apparatus comprises a reference value generator, a control value generator, and a compensation circuit. The reference value generator generates a reference value representative of a portion of pixels contained in an input image associated with one of the second set of units. The control value generator generates a control value to control one of the first set of units in view of the reference value. The compensation circuit adjusts the portion of pixels contained in the input image in view of the control value. The one of the first units is associated with the one of the second units. | 12-02-2010 |
20130235151 | Image Adjusting Apparatus and Associated Method - An image adjusting method for extending vertical blanking intervals of an image signal is provided. Using the image adjusting method, an adjusted image signal is synchronized with an image signal before the adjustment to prevent image delay. The image adjusting method comprises providing a first image signal having a first data enable signal, wherein the first data enable signal has a first data enable duration; and generating a second data enable signal having a second data enable duration. The first and second data enable durations correspond to a same image frame of an image signal, and the second data enable duration substantially overlaps the first data enable duration. | 09-12-2013 |
Patent application number | Description | Published |
20160000192 | Brooch Device Having Function of Illumination - A brooch device with function of illumination is provided. The brooch device comprises a brooch member with light emitting member and a housing. The housing is combined with the brooch member. A switch is configured to the brooch member for selectively energizing and de-energizing light emitting device. When the light emitting device inside the housing is activated, the brooch device can emit light for illuminating. | 01-07-2016 |
20160001192 | Roly-Poly Toy Device Having Function of Illumination - A roly-poly toy device with function of illumination is provided. The roly-poly toy device comprises a weighted base, a middle base and a top housing. The weighted base with a bottom housing and a weighted object is combined with the top housing to enclose the middle base. The weighted object and the middle base are fixed onto the bottom housing. The middle base has light emitting device formed thereon. When the light emitting device inside the top housing is activated, the roly-poly toy device can emit light for illuminating. | 01-07-2016 |
20160003441 | Ornamental Article Having Effects of Transparency or Opacity - An ornamental article with effects of transparency or opacity is provided. The ornamental article comprises a transparent ornamental main body with an accommodating space. A bottom base is combined with the ornamental main body. A switch is configured to the bottom base for selectively energizing and de-energizing said at least one light emitting device. A first metal layer and/or a second metal layer is formed on an inner surface and/or an outer surface of the ornamental main body, respectively, when the at least one light emitting device inside the ornamental main body is activated, internal image of the ornamental main body can be seen from outside of the ornamental main body. | 01-07-2016 |
20160003467 | Hair Band Device Having Function of Illumination - A hair band device with function of illumination is provided. The hair band device comprises a hair band body and a light emitting member. A bottom base is combined with the hair band body. A switch is configured to the bottom base for selectively energizing and de-energizing light emitting device. When the light emitting device inside housing of the light emitting member is activated, the hair band device can emit light for illuminating. | 01-07-2016 |