Patent application number | Description | Published |
20090140655 | SIMPLE PROTECTION CIRCUIT AND ADAPTIVE FREQUENCY SWEEPING METHOD FOR CCFL INVERTER - A CCFL inverter circuit integrates a feedback circuit and protection circuit together. For both in-phase and out-of-phase applications, sensed lamp voltages can be used for open lamp and short lamp detection and sensed currents can be used for open lamp detection. The driving circuit adjusts the open lamp frequency by using a duty cycle control signal so that the driving circuit can always achieve the desired lamp voltage gain. | 06-04-2009 |
20090295445 | DOUBLE-EDGE PWM CONTROLLER AND ITS CONTROL METHOD THEREOF - The present invention discloses a double-edge pulse width modulation (PWM) controller based on the output current and output voltage which is modulated in real time by the output current and the output voltage. The controller uses an extra first adder to sum up the compensation signal and a triangular signal (or a saw-tooth signal); a second adder to sum up the output current signal to a bias value; a PWM comparator, with its non-inverting input receiving the output of said first adder, its inverting input receiving the output of said second adder and outputs the PWM signal. | 12-03-2009 |
20100026270 | AVERAGE INPUT CURRENT LIMIT METHOD AND APPARATUS THEREOF - The embodiment of invention discloses an average input current limit method and apparatus thereof. The apparatus comprises a switching circuit, a current average circuit and a current limit circuit. The current average circuit samples the input current of the switching circuit and generates a signal representative of the average value of the input current. The current limit circuit limits the signal so as to limit the average value of the input current. | 02-04-2010 |
20100110595 | INPUT SURGE PROTECTION DEVICE USING JFET - An input surge suppression device and method that uses a simple JFET structure. The JFET has its gate clamped to a predetermined value, its the drain receives the input voltage from an input power source, its source is connected to the input of a down-stream device, and a resistor connected between the drain and the gate or between the source and the gate. Thus, when the drain voltage approximates the clamped gate voltage, the source voltage nearly equals the drain voltage. When the drain voltage rises above the clamped gate voltage, the source voltage is lower than the drain voltage. The downstream device may be a DC-DC converter and the gate is biased by the enable (EN) pin of a DC-DC converter. | 05-06-2010 |
20100252918 | MULTI-DIE PACKAGE WITH IMPROVED HEAT DISSIPATION - The present invention discloses a multi-die package which facilitates heat dissipation for a high power consumption die. In the package, part of the lead frame is bent so as to be exposed at the surface of the package. On the opposite side of the exposed surface, a high power consumption die is attached. The other die with lower power consumption is not at the surface of the multi-die package. | 10-07-2010 |
20100270937 | CIRCUIT AND METHOD FOR STRIKING CCFL - A circuit for controlling the switch frequency of an inverter that strikes and drives fluorescent lamps is disclosed. The circuit comprises a frequency generator and an offset circuit. The offset circuit provides a current signal in response to the lamp status. The frequency generator provides a frequency control signal in respond to the current signal so as to control the switch frequency of the inverter. When the lamp is open, the switch frequency of the inverter is higher; when the lamp is lighted, the switch frequency of the inverter is lower. | 10-28-2010 |
20100302288 | DUAL ENDED DRIVER CIRCUIT FOR LCD BACKLIGHT AND THE METHOD THEREOF - A dual ended driver circuit for a LCD backlight is disclosed. The circuit comprises a master board and a slave board, which provides a first output drive signal and a second output drive signal to either end of a lamp set, respectively. The circuit only uses one control chip to synchronize and make symmetrical the first output drive signal and the second output drive signal. | 12-02-2010 |
20110101885 | LED BACKLIGHT CIRCUIT FOR LCD PANELS - An LED backlight circuit includes a transformer that takes a high voltage from a high voltage bus on a first winding. Current induced on a second winding of the transformer charges an energy storage capacitor. Energy stored in the energy storage capacitor drives a single string of series-connected LEDs to provide backlighting to an LCD panel. The high voltage may be taken directly off an output of a power factor correction circuit. | 05-05-2011 |
20110182095 | PACKAGE FOR SYNCHRONOUS RECTIFIER MODULE - The present technology discloses a package for a synchronous rectifier module, and also discloses synchronous rectification circuits and power supply adapters. The synchronous rectification circuit co-packages the synchronous rectifier and the driver into one single package. The single package simplifies the external circuitry and reduces potential electromagnetic interferences. | 07-28-2011 |
20120056543 | BYPASS CIRCUITRY FOR SERIALLY COUPLED LIGHT EMITTING DIODES AND ASSOCIATED METHODS OF OPERATION - The present technology is generally related to LED bypass circuits and associated methods of operation. In one embodiment, an LED bypass circuit includes a monitoring circuit and a bypass switch. The monitoring circuit is coupled to the LED to monitor the differential voltage across the LED. The bypass switch is coupled to the LED in parallel. When an open status is detected by the monitoring circuit, the bypass switch is turned on to bypass the LED. | 03-08-2012 |
20120068320 | Integrated Power Converter Package With Die Stacking - An integrated circuit for implementing a switch-mode power converter is disclosed. The integrated circuit comprises at least a first semiconductor die having an electrically quiet surface, a second semiconductor die for controlling the operation of said first semiconductor die stacked on said first semiconductor die having said electrically quiet surface and a lead frame structure for supporting said first semiconductor die and electrically coupling said first and second semiconductor dies to external circuitry. | 03-22-2012 |
20120274293 | MULTIPHASE CONVERTER WITH CONTROLLABLE PHASE SHIFT - In one embodiment, a multiphase converter is disclosed. The multiphase converter may comprise a plurality of phase circuits and a plurality of phase control circuits. Each phase circuit may comprise a switch having a control terminal, and the control terminal of the switch may be configured to receive a drive signal. Each phase control circuit may be corresponding to one of the phase circuits, and each phase control circuit may be configured to provide a phase control signal to adjust an ON-time period or a reference signal for the corresponding phase circuit. The phase control signal may be responsive to the drive signal of the corresponding phase circuit. | 11-01-2012 |
20120293141 | BRIDGELESS PFC CONVERTER AND THE METHOD THEREOF - A bridgeless PFC (power factor correction) converter with improved efficiency is disclosed. The bridgeless PFC converter comprises: input terminals configured to receive an input AC power supply; an output terminal configured to provide power supply; a high frequency bridge arm comprising a first switch and a third switch coupled between the output terminal and a ground node; a low frequency bridge arm comprising a second switch and a fourth switch coupled between the output terminal and the ground node; an inductor coupled between the input AC power supply and the high frequency bridge arm; and a control circuit configured to control the switching of switches in the high frequency bridge arm and the low frequency bridge arm. | 11-22-2012 |
20130162236 | Energy Harvest System and the Method Thereof - The present disclosure discloses an energy harvest system converting an AC source provided by an energy harvester to a desired voltage. The AC source is boosted to the desired voltage by a bi-directional booster converter comprising fourth controllable transistors configured in an H-bridge, and stored by a storage capacitor. The desired voltage is then used to power various loads. | 06-27-2013 |
20130166947 | POWER SYSTEM WITH HOT-SWAP AND THE METHOD THEREOF - The present disclosure discloses a power system with hot-swap with a buck converter. The power system comprises a front stage, a hot-swap stage and a load stage; wherein the hot-swap stage comprises: a buck converter having a switch operate at ON/OFF state to provide a desired output voltage to the load stage with low power loss and optimized thermal design. | 06-27-2013 |
20130169258 | Switching Mode Power Supply and the Method Thereof - The present disclosure discloses a switching mode power supply with bi-direction buck and boost control. The switching mode power supply enters boost mode when an input signal is higher than a preset threshold to pump the input signal to a higher level; and the switching mode power supply enters buck mode when the input signal breaks down to release the stored energy. | 07-04-2013 |
20130176004 | SWITCHING MODE POWER SUPPLY - The present disclosure discloses a switching mode power supply with constant peak current mode control. During the operation of the switching mode power supply, in one hand, the current flowing through a high-side switch is sensed and compared to a current reference signal to control the turning off of the high-side switch; in the other hand, the output voltage is sensed and compared to a voltage reference signal to control the turning on of the high-side switch. In addition, the current reference signal may be adjusted to a lower value when the switching mode power supply enters light load condition. By using the above control method, the system performance is highly increased. | 07-11-2013 |
20130176009 | SMART LOW DROP-OUT VOLTAGE REGULATOR AND ASSOCIATED METHOD - The present disclosure discloses a low drop-out voltage regulator and an electronic device comprising the same. The present disclosure also discloses a method for converting a power supply voltage to a regulated output voltage. The low drop-out voltage regulator comprises a pass device controllable to convert a power supply voltage to a regulated output voltage; and a controller configured to receive an input signal and to provide a driving signal to the control terminal of the pass device based on the input signal, wherein when the input signal is within a predetermined range, the driving signal turns the pass device ON, and the power supply voltage charges the output voltage; and wherein when the input signal is without the predetermined range, the driving signal turns the pass device OFF, and the power supply voltage stops charging the output voltage. | 07-11-2013 |
20130264964 | LED DRIVER CIRCUITS WITH CURRENT ENVELOPE CONTROL - A light emitting diode (LED) driver circuit controls switching of an output transistor. The LED driver circuit monitors inductor current flowing through an output inductor that is coupled to one or more LEDs. In response to detecting that the inductor current has reached a peak value, the LED driver circuit switches OFF the output transistor. The LED driver circuit switches ON the output transistor in response to detecting zero crossing of the inductor current. The LED driver circuit may detect zero crossing of the inductor current from a gate voltage of the output transistor by detecting for a negative spike. | 10-10-2013 |
20130292814 | INTEGRATED POWER CONVERTER PACKAGE WITH DIE STACKING - An integrated circuit for implementing a switch-mode power converter is disclosed. The integrated circuit comprises at least a first semiconductor die having an electrically quiet surface, a second semiconductor die for controlling the operation of said first semiconductor die stacked on said first semiconductor die having said electrically quiet surface and a lead frame structure for supporting said first semiconductor die and electrically coupling said first and second semiconductor dies to external circuitry. | 11-07-2013 |
20130307498 | MULTI-PHASE SWITCHING CONVERTER AND CONTROL METHOD THEREOF - A multi-phase switching converter comprising a plurality of switching circuits, a comparing circuit and a control circuit. The comparing circuit generates a comparison signal based on a reference signal and the output voltage of the multi-phase switching converter. The control circuit can turn on the following switching circuit based on the comparison signal only after the time from the current switching circuit being turned on reaches a first time threshold or the off-time of the current switching circuit reaches a second time threshold, wherein the first time threshold is longer than the second time threshold. | 11-21-2013 |
20130342176 | MULTI-PHASE SWITCHING-MODE POWER SUPPLY AND ASSOCIATED CONTROL METHOD - The present invention discloses a multi-phase switch-mode power supply (SMPS). The multi-phase SMPS may comprise a plurality of comparing circuits and a controller. Wherein each comparing circuit comprises a first input coupled to a threshold voltage, a second input coupled to a feedback signal of the output voltage, and an output configured to provide a load indication signal. The controller may have a plurality of inputs coupled to the outputs of the comparing circuit, and a plurality of outputs configured to provide control signals for driving a plurality of switches of the multi-phase SMPS. And the controller is configured to selectively turn on a plurality of the switches according to the load indication signals. | 12-26-2013 |
20140043875 | OFF-LINE REGULATOR AND ASSOCIATED METHOD - The present invention discloses an off-line regulator. The off-line regulator comprises a rectification circuit configured to rectify an AC line voltage into a rectified line voltage; a pass device coupled between the rectified line voltage and a first capacitor, the pass device is configured to be turned ON or OFF according to a comparison signal indicating whether the rectified line voltage is over a threshold voltage. The first capacitor delivers an interim voltage into a converter which supplies power to a load. Wherein a second capacitor coupled across a driver which driving the pass device is charged by the first capacitor when the comparison signal is at a first state, and the driver is boosted when the comparison signal is at a second state. | 02-13-2014 |
20140071720 | VOLTAGE CONVERTER AND ASSOCIATED OVER-VOLTAGE PROTECTION METHOD - A voltage converter includes: an input terminal receiving an input voltage; an output terminal providing an output voltage; a switching circuit having a main switch configured to regulate the output voltage, wherein a control end of the main switch is configured to receive a Pulse Width Modulation (PWM) signal, and the output voltage is controlled according to the duty cycle of the PWM signal; and a protection switch coupled between the input terminal and the switching circuit, and wherein when the output voltage is higher than a reference voltage, the protection switch is turned OFF. | 03-13-2014 |
20140107857 | DIGITALLY CALIBRATED VOLTAGE REGULATORS FOR POWER MANAGEMENT - A computer provides a graphical user interface for displaying a virtual representation of a voltage regulator and for accepting a user requirement for the voltage regulator. The computer automatically determines an internal calibration setting of the voltage regulator that meets the user requirement. The computer simulates operation of the voltage regulator as calibrated with the internal calibration setting. The internal calibration setting is downloaded to the voltage regulator. A calibration controller of the voltage regulator receives the internal calibration setting and outputs digital calibration bits in accordance with the internal calibration setting. The digital calibration bits works in conjunction with interface circuits to adjust circuits of a voltage regulator core to digitally calibrate the voltage regulator. | 04-17-2014 |
20140125302 | COT CONVERTER WITH CONTROLLED FREQUENCY AND ASSOCIATED METHOD - A SMPS having a switch; an output port coupled to a load, configured to provide a voltage feedback signal and a current feedback signal; an on-time generator, having an input end coupled to the current feedback signal, and having an output end providing a time signal indicating a time period; and a PWM generator, having a first input end coupled to the voltage feedback signal, a second input end coupled to the time signal, and an output end providing a PWM signal that is coupled to the control end of the switch, and wherein the PWM signal is configured to turn ON the switch when the voltage feedback signal is lower than a threshold voltage, and the PWM signal is configured to turn OFF the switch after the time period. | 05-08-2014 |
20140354349 | CHARGE PUMP AND METHOD OF HAVING NEGATIVE OUTPUT VOLTAGE TRACKING POSITIVE OUTPUT VOLTAGE THEREOF - A method having a negative output voltage at a negative output terminal of a charge pump tracking a positive output voltage at a positive output terminal of the charge pump. The charge pump comprises a plurality of switches and each of the plurality of switches has a serially coupled resistance. The method comprises selecting the serially coupled resistance for at least one of the plurality of switches to be different to each of the other respective serially coupled resistances associated to the other switches. | 12-04-2014 |