Did You Know...
...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 8094468 | Control circuit having off-time modulation to operate power converter at quasi-resonance and in continuous current mode A control circuit is developed to adaptively operate a power converter at quasi-resonance (QR) and in a continuous current mode (CCM) to achieve high efficiency. The control circuit includes a PWM circuit generating a switching signal coupled to switch a transformer... | 01/10/2012 |
| 8089783 | Constant current and voltage controller in a three-pin package with dual-use switch pin A flyback converter includes a controller integrated circuit (IC) housed in an IC package with only three terminals. The controller IC is grounded through a ground terminal. A feedback signal is received onto a power terminal. The feedback signal powers the controll... | 01/03/2012 |
| 8064231 | Short circuit protection circuit for a pulse width modulation (PWM) unit A short circuit protection circuit for a pulse width modulation (PWM) unit which includes a PWM logic control circuit, an under voltage lookout (UVLO) circuit and an internal clock circuit; wherein the UVLO circuit detecting a bias power (Vcc) and delivering an UVLO... | 11/22/2011 |
| 8031493 | Method and apparatus for improving the light load efficiency of a switching mode converter A method and apparatus are provided for a switching mode converter to improve the light load efficiency thereof. The converter is thus operated with three modes by monitoring a feedback signal and a supply voltage. When the feedback signal indicates that loading get... | 10/04/2011 |
| 8031492 | PWM controller for compensating a maximum output power of a power converter A PWM controller having an oscillator, a control circuit and a two-level limiter is provided. The oscillator generates a pulse signal. The control circuit couples to the oscillator for generating a PWM signal in response to the pulse signal, wherein the PWM signal c... | 10/04/2011 |
| 8023292 | Switching control device The present invention reduces switching noise generated in a switching control device having a switching element such as a switching power supply in linear linkage with the state of a load of the output and without increasing the control circuit scale which is a fac... | 09/20/2011 |
| 8018743 | Adaptive control for transition between multiple modulation modes in a switching power converter In a switching power converter, PWM mode and PFM mode are separated into two independent control sections with the control voltage range in each control section determined independently. Each of the PWM and PFM modulation modes cannot operate continuously beyond its... | 09/13/2011 |
| 7978484 | Flyback constant voltage converter having both a PWFM mode and a PWM mode A flyback AC/DC switching converter has a constant voltage (CV) mode. The CV mode has sub-modes. In one sub-mode (“mid output power sub-mode”), the output voltage (VOUT) of the converter is regulated using both pulse width modulation and pulse frequency modulati... | 07/12/2011 |
| 7782635 | DC converter with independently controlled outputs A DC converter comprises a single primary circuit which is coupled to each of a plurality of output circuits in respective time periods, the coupling being provided by switching in the output circuits. Each output circuit produces a respective output voltage and a r... | 08/24/2010 |
| 7778051 | Output current control circuit for power converter with a changeable switching frequency A control circuit controls the output current of the power converter at the primary side of the transformer. The control circuit includes a current-detection circuit for generating a primary-current signal in response to the switching current of the transformer. A v... | 08/17/2010 |
| 7760520 | Current controlled switching mode power supply A current controlled switching mode power supply is provided. A turn on/off time of a switching device is adjusted by controlling a leading edge blanking (LEB) time and an external drive current of the switching device by means of a switching controller, thus capabl... | 07/20/2010 |
| 7746673 | Flyback constant voltage converter having both a PWFM mode and a PWM mode A flyback AC/DC switching converter has a constant voltage (CV) mode. The CV mode has sub-modes. In one sub-mode (“mid output power sub-mode”), the output voltage (VOUT) of the converter is regulated using both pulse width modulation and pulse frequency modulati... | 06/29/2010 |
| 7710746 | Switching mode power supply and driving method thereof A switching mode power supply includes: a power supply unit that comprises a switch that is coupled to a primary coil at a primary side of a transformer for converting an input DC voltage, and that supplies power to a secondary coil and a tertiary coil at a secondar... | 05/04/2010 |
| 7679939 | Control circuit for a switching power supply, method for controlling a switching power supply and computer program A control circuit for a power supply having a controllable switch for switching a current through a first transformer winding and a voltage providing circuit for providing an output voltage based on a voltage generated in a second transformer winding has a comparing... | 03/16/2010 |
| 7505288 | DC converter with independently controlled outputs A DC converter comprises a single primary circuit which is coupled to each of a plurality of output circuits in respective time periods, the coupling being provided by switching in the output circuits. Each output circuit produces a respective output voltage and a r... | 03/17/2009 |
| 7499295 | Switch mode power supply controllers This invention generally relates to discontinuous conduction mode switch mode power supply (SMPS) controllers employing primary side sensing. We describe an SMPS controller which integrates a feedback signal from a point determined by a target operating voltage to a... | 03/03/2009 |
| 7480159 | Switching-mode power converter and pulse-width-modulation control circuit with primary-side feedback control A pulse-width-modulation control circuit of a switching-mode power converter with a primary-side feedback control is disclosed. The switching-mode power converter includes a transformer, a power switch, a current sensing resistor and the pulse-width-modulation contr... | 01/20/2009 |
| 7433210 | Switched-mode power supply comprising an adjustable oscillator The switched-mode power supply has a transformer which contains a primary winding and at least one secondary winding, a switching transistor in series with the primary winding, a driver stage for controlling the switching transistor, and a control circuit for contro... | 10/07/2008 |
| 7426123 | Finite state machine digital pulse width modulator for a digitally controlled power supply A method is disclosed for generating pulse width modulated pulse control signals for controlling switches in a switching power supply. First, a count value is determined of a master clock within a switching cycle of the power supply from beginning to end thereof. A ... | 09/16/2008 |
| 7400064 | DC/DC power converter A switching regulation system and control scheme efficiently enables driving multiple loads from a common energy storage element, such as an inductor. The control scheme operates to store energy in the energy storage element over a first portion of a cycle, such as ... | 07/15/2008 |
| 7394668 | Switching power supply circuit and frequency converter An object of the present invention is to lower the voltage applied to the starting resistor of the starting circuit in a switching power supply circuit to reduce the power loss especially when the receiving voltage is high and thereby provide a small and inexpensive... | 07/01/2008 |
| 7394669 | Switching mode power supplies In a switching mode power supply, an input received from the secondary side of the transformer 7 and indicative of the power being drawn by the loads is used to control the timing of bursts. The input is compared with two threshold different threshold values ... | 07/01/2008 |
| 7394670 | Switching power source A control circuit 8 of a switching power source comprises a voltage detector 31 for detecting a voltage VDC of a DC power supply 1 to produce a detection voltage VDT; a comparator 41 for producing an output signal V | 07/01/2008 |
| 7391629 | Switching mode power supply with controller for handling overcurrents Disclosed is an SMPS for preventing abnormal overcurrents. A circuit having a short circuit delay is used to generate a control signal for turning off a main switch (i.e., a switching MOS transistor) when the overcurrent occurs, that is, in an initial startup or whe... | 06/24/2008 |
| 7388763 | Switching power supply A switching power supply of the present invention comprises: a switching element through which a DC voltage is supplied via a primary winding; an output voltage detection circuit detecting a voltage of a secondary winding to generate an error signal; a regulator gen... | 06/17/2008 |
| 7385832 | Method of forming a secondary-side controller and structure therefor In one embodiment, a secondary-side controller is configured to detect a burst-mode of operation and responsively block or prevent sending drive pulses to a power transistor that is coupled in the secondary side. ... | 06/10/2008 |
| 7362593 | Switching control circuit having off-time modulation to improve efficiency of primary-side controlled power supply A voltage-waveform detector produces a voltage-feedback signal and a discharge-time signal by multi-sampling a voltage signal of a transformer. The discharge-time signal represents a discharge time of a secondary-side switching current. A voltage-loop error amplifie... | 04/22/2008 |
| 7362594 | Adaptive resonant switching power system A resonant switching power system operates with two resonant frequencies. A first frequency depends on the secondary leakage inductance of an output transformer and capacitor. The first frequency varies with changes in the load because load changes alter the leakage... | 04/22/2008 |
| 7362592 | Switching control circuit for primary-side controlled power converters The present invention discloses a switching control circuit for a primary-side controlled power converter. A voltage-waveform detector produces a voltage-feedback signal and a discharge-time signal. A current-waveform detector generates a current-waveform signal by ... | 04/22/2008 |
| 7359220 | Control circuit for controlling a switch based on a voltage of an auxiliary winding in a switching power supply The present invention refers to a control circuit and an associated method of controlling the output voltage of a primarily controlled power switching supply with a primary-sided switch and a transformer with an auxiliary winding, in which after opening the primary-... | 04/15/2008 |
| 7359225 | Method and apparatus to limit output power in a switching power supply Techniques are disclosed to adjust a current limit in a switching regulator. One example switching regulator includes a switch to be coupled to an energy transfer element of a power supply. A controller to generate a drive signal is coupled to control switching of t... | 04/15/2008 |
| 7355864 | Switching regulator and its control method A switching regulator has an input voltage detection circuit which inputs a voltage applied to a rectifier diode 7 connected in series with the secondary side of a transformer and generates a voltage signal Vvp corresponding to the voltage, and a calculation ... | 04/08/2008 |
| 7352595 | Primary-side controlled switching regulator A switching regulator includes a switching device to switch a transformer from a primary-side to secondary side. A control circuit generates a switching signal for regulating output of the switching regulator. The control circuit includes a first circuit to generate... | 04/01/2008 |
| 7345894 | Cascode switch power supply A switching power supply is disclosed for improving the no-load power drain of low-power mains operated supplies. The power converter utilizes a cascoded switch arrangement with a conventional high voltage power MOSFET and a low voltage, low gate charge MOSFET. Driv... | 03/18/2008 |
| 7342812 | Switch mode power supply systems Methods and apparatus for sensing the output current in a switch mode power supply (SMPS) using primary side sensing are described. A module senses a current in a primary winding of a transformer and a voltage on a primary or auxiliary winding of the transformer, an... | 03/11/2008 |
| 7330360 | Driving apparatus of display device and DC-DC converter A DC-DC converter is provided, which includes a transformer including a primary coil and a secondary coil, a boost converter connected to the primary coil of the transformer and generating a first voltage, and a flyback converter connected to the secondary coil of t... | 02/12/2008 |
| 7330359 | Power supply unit The present invention is directed to a power supply unit that provides large power supply to the load. The voltage detector 51 generates a voltage detection signal by detecting the voltage generated at the output terminals 21, 22. The current detector ... | 02/12/2008 |
| 7313005 | PWM circuit control method In the PWM circuit of the present invention, a PWM counter counts clock signals. A reference value setting register sets a comparative reference value for determining a duty ratio of a PWM signal. A comparator generates the PWM signals based on a comparative result ... | 12/25/2007 |
| 7310244 | Primary side controlled switching regulator A switching regulator includes a transformer having a primary winding and an auxiliary winding connected to the supply rail of the switching regulator. The primary winding is coupled to the positive supply rail. The auxiliary winding is coupled to the negative suppl... | 12/18/2007 |
| 7310248 | Control method of switching a power supply circuit A switching power supply for achieving a constant current drooping characteristic of sufficient accuracy with low cost and the minimum number of components. In the switching power supply, a secondary duty limiter circuit outputs a clock signal from the time a switch... | 12/18/2007 |
