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| Number | Title | Issue Date |
| 7643313 | Power converter for compensating maximum output power and PWM controller for the same A PWM controller compensates a maximum output power of a power converter, and includes a PWM unit and a compensation circuit. The PWM unit generates a PWM signal for controlling a power switch to switch a power transformer, which has a primary winding connected to t... | 01/05/2010 |
| 7619903 | Switching mode power supply and a method of operating the power supply in a power save mode A switching mode power supply and a method of operating the power supply in a power save mode. The switching mode power supply includes a first PWM controller and a second PWM controller that are driven by different driving voltages and control first and the second ... | 11/17/2009 |
| 7613017 | Gated pulse power converter systems and methods The present invention is generally directed to power converter systems and methods that regulate an output voltage by gating a fixed energy pulse. For example, a comparator may be used to gate a programmable timer that is optimized to provide a fixed “on-time” a... | 11/03/2009 |
| 7499292 | Power device and power adjusting method A power device includes a transformer, a control signal outputting unit, and a power adjusting unit. The transformer has a primary coil and a secondary coil. The control signal outputting unit variably controls a parameter value and outputs, based on the parameter v... | 03/03/2009 |
| 7480156 | Tapped inductor power conversion networks The subject invention reveals new three terminal tapped inductor canonical cells for non-isolated power conversion. The canonical cells achieve reduced semiconductor component stresses for applications with limited line voltage range for small step up and step down ... | 01/20/2009 |
| 7450402 | Soft switching high efficiency flyback converter DC-DC converters such as flyback converters achieve self-regulation by communication information between primary and secondary circuits through the power transformer. Operating in accordance with a generalized concept or algorithm, the converter can be bi-directiona... | 11/11/2008 |
| 7443699 | Negative current compensation method and circuit A power supply controller (10, 60, 70) uses a negative current (36) of a power transistor (16, 71) to detect the valley point for enabling the power transistor when driving an inductor (17). The negative current occurs when the inductor i... | 10/28/2008 |
| 7426120 | Switching control circuit having a valley voltage detector to achieve soft switching for a resonant power converter The present invention provides a switching control circuit having a valley voltage detector to achieve the soft switching and improve the efficiency of a power converter. The switching control circuit includes a control circuit coupled to the feedback signal to gene... | 09/16/2008 |
| 7420823 | Power factor correction control circuit A bi-directional boost circuit for power factor correction includes a power factor control circuit and a pair of diodes, a pair of inductors, and a pair of switches. A first diode, a second diode, a first inductor, a second inductor, a first switch, and a second swi... | 09/02/2008 |
| 7405952 | Power supply device A power supply device has first and second terminals, a transformer, a switching element and an auxiliary power supply element. The first and second terminals receive input power having an input voltage. The transformer has a primary winding and a secondary winding.... | 07/29/2008 |
| 7375995 | Power factor correction circuit A power factor correction circuit used for regulating the phase of a DC current outputted from a rectifier unit in a power supply includes an energy inductor, an output diode, a switch unit, a pulse width modulation unit, a sensing resistor, and a converter transfor... | 05/20/2008 |
| 7365997 | Synchronous switching control circuit for power converters The present invention provides a synchronous switching control circuit for variable switching frequency power converters. It comprises a first circuit to generate a first signal in response to an input synchronous signal of a power converter. A second circuit is cou... | 04/29/2008 |
| 7365996 | Switched-mode power supply A switched-mode power supply for converting a DC input voltage (Uzk) into an output voltage (Ua). The switched-mode power supply comprises a circuit (AST) for triggering at least one controlled switch (S) that periodically applies the input voltage to at least one p... | 04/29/2008 |
| 7362007 | Hybrid uninterruptible power supply system An apparatus, system, and method for supplying an uninterruptible power source to a dual power device capable of being alternately powered through either a primary power input connected to a primary power source or a secondary power input connected to a secondary po... | 04/22/2008 |
| 7362077 | Pre-charge method for isolated boost converter A boost control module operates semiconductor switches of a boost converter circuit in an avalanche mode to precharge a boost output capacitor. The boost control module comprises a switching module that complementarily transitions a first semiconductor switch and a ... | 04/22/2008 |
| 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 |
| 7359219 | Power supply A power supply, including a step-up converter, a resonant converter, and control unit. The step-up converter is connected to the resonant converter; the step-up converter and the resonant converter are each connected to the primary control unit. ... | 04/15/2008 |
| 7359998 | Low-power CD-ROM player with CD-ROM subsystem for portable computer capable of playing audio CDs without supply energy to CPU A low-power audio CD player for portable computers permits operation of the CD-ROM subsystem when power is not being supplied to the computer subsystem. In one embodiment of the invention, the computer subsystem comprises a system CPU, a digital-audio generating cir... | 04/15/2008 |
| 7355871 | Method and apparatus for substantially reducing electrical earth displacement current flow generated by wound components An energy transfer element having an energy transfer element input winding, an energy transfer element output winding and energy transfer element windings that reduce displacement currents. In one aspect, an energy transfer elements includes an energy transfer eleme... | 04/08/2008 |
| 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 |
| 7355870 | Switching mode power supply and method for outputting voltage therefrom A switching mode power supply and a method for outputting voltage therefrom are provided, where a transformer receives rectified alternating current (AC) voltage and transforms a voltage value or a current value, a switching transistor is connected to one end of a f... | 04/08/2008 |
| 7349229 | Causal sampling circuit for measuring reflected voltage and demagnetizing time of transformer A causal sampling circuit is developed to measure a reflected voltage and demagnetizing time of the transformer. It includes a signal-generation circuit to generate a sample signal for sampling the reflected voltage of the transformer. A ramp signal of the sampling ... | 03/25/2008 |
| 7339799 | Switching power supply A switching power supply includes a first series circuit formed by connecting first and second switching elements in series at both ends of a direct-current power source, a second series circuit formed by connecting a resonant capacitor, a resonant reactor, and a pr... | 03/04/2008 |
| 7334630 | Closed-loop microchannel cooling system Apparatus and methods according to the present invention utilize micropumps that are capable of generating high pressure and flow without moving mechanical parts and the associated generation of unacceptable electrical and acoustic noise, as well as the associated r... | 02/26/2008 |
| 7336057 | DC/DC converter A DC/DC converter includes: a boost converter that boosts an input voltage in accordance with a first control signal; an insulated converter that converts an output of the boost converter in accordance with a second control signal; a current sensor that detects an o... | 02/26/2008 |
| 7336037 | Intelligent electrical switching device The present invention, according to a preferred embodiment, is directed to portable electronic devices which operate on exhaustible power sources, for example, batteries. The electronic devices of the present invention comprise at least one signal switch and a micro... | 02/26/2008 |
| 7319232 | Apparatus and method for high-bandwidth opto-coupler interface An opto-coupler interface is provided. The opto-coupler interface includes a current mirror and a resistor. The opto-coupler interface is arranged such that a relatively fixed voltage is provided across the photodetector. At one end of the photodetector, the voltage... | 01/15/2008 |
| 7315150 | Method of power conversion and apparatus which achieves high power factor correction using ripple current mode control A ripple current mode power converter comprised of a magnetic energy storage element, and a method of determining magnetic storage element charge duration based on periodic magnetic storage element current samples. In the preferred embodiment a controller processes ... | 01/01/2008 |
| 7313007 | Power factor correction controller A power factor correction controller simultaneously controls several power converters to be operated at a critical conduction mode to improve the overall conversion efficiency and conversion power of the power factor corrector. The controller includes a primary powe... | 12/25/2007 |
| 7307334 | Integrated circuit having features to limit substrate current A technique includes forming a first well in a substrate and forming a second well in the substrate. The first well is electrically isolated from the second well. The technique includes forming an element in the second well to limit current between the first well an... | 12/11/2007 |
| 7304436 | Generator for sustaining pulse of plasma display panel It is disclosed that there is a sustaining pulse generator of a plasma display panel capable of simplifying a circuit configuration thereof. A sustaining pulse generator of a plasma display panel according to an embodiment of the present invention includes a ... | 12/04/2007 |
| 7291989 | Lighting control circuit for vehicle lighting equipment This disclosure relates to protecting a switching regulator by sensing immediately a change in an input voltage when the input voltage of the switching regulator is changed suddenly. When an input voltage of a switching regulator 12 is changed suddenly and an... | 11/06/2007 |
| 7289329 | Integration of planar transformer and/or planar inductor with power switches in power converter A power converter integrates at least one planar transformer comprising a multi-layer transformer substrate and/or at least one planar inductor comprising a multi-layer inductor substrate with a number of power semiconductor switches physically and thermally coupled... | 10/30/2007 |
| 7285989 | Device for detection of power-off A power-off detection device is formed without use of a photo coupler, which is expensive and occupies a relatively large area. The power-off detection device rectifies AC power, provided as external input power from a power supply device, into DC power, detects the... | 10/23/2007 |
| 7280376 | Primary side voltage sense for AC/DC power supplies capable of compensation for a voltage drop in the secondary In a method and system for providing isolated power, a flyback controller includes a transformer operable to receive a primary voltage input and generate a secondary voltage output. A switch electrically coupled in series with a primary side of the transformer recei... | 10/09/2007 |
| 7276999 | Method and apparatus for substantially reducing electrical earth displacement current flow generated by wound components An energy transfer element having windings. In one aspect, the energy transfer element includes a first winding wound around a core, the first winding has a first end and a second end. A second winding is wound around the core. The second winding has a first end and... | 10/02/2007 |
| 7274575 | AC coupled bias circuit for power converters A switching power system for converting an input voltage to an output voltage across a transformer is disclosed. The system includes a control circuit. The control circuit has a control input coupled for receiving the output voltage and an output coupled to a primar... | 09/25/2007 |
| 7274578 | Converter circuit having class E converter modules The invention relates to a converter circuit having a series circuit of class E converter modules for optimizing the DC supply voltage of the individual converter module (for example C7, C11, Z1, S1, L1, L2). ... | 09/25/2007 |
| 7272023 | High efficiency power converter A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in ser... | 09/18/2007 |
| 7269034 | High efficiency power converter A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in ser... | 09/11/2007 |