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| Number | Title | Issue Date |
| 8179699 | Method for controlling a switching regulator and related switching regulator An embodiment of a power-supply controller comprises a switching-control circuit, an error amplifier, and a signal generator. The switching-control circuit is operable to control a switch coupled to a primary winding of a transformer, and the error amplifier has a f... | 05/15/2012 |
| 8149598 | Switching power supply apparatus A switching power supply apparatus according to the present invention includes a switching device and a control circuit, and the control circuit includes: a control terminal through which an auxiliary power voltage is supplied; an error amplifier which generates a d... | 04/03/2012 |
| 8014175 | Switching power conversion circuit A switching power conversion circuit includes a power circuit, a feedback circuit and a control circuit. The power circuit includes a switching circuit and a first magnetic element. The first magnetic element generates a magnetic flux change by alternately conductin... | 09/06/2011 |
| 7961481 | Pulse width modulation control circuit applied to charge output capacitor A pulse width modulation (PWM) control circuit is applied to a power converter with a charging capacitor. The PWM control circuit includes a PWM signal generator, a first comparator, and a reference voltage modulator. A PWM signal generator generates a PWM signal to... | 06/14/2011 |
| 7948777 | 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 ... | 05/24/2011 |
| 7916504 | Voltage detection device and voltage detection method A voltage detection device that is connected to a DC circuit to which a DC voltage is applied and that detects the DC voltage applied to the DC circuit includes a voltage conversion unit for outputting a first voltage that increases as the DC voltage increases and a... | 03/29/2011 |
| 7869227 | Power supply apparatus and method A method of supplying a power to elements in a power supply apparatus including a primary side and a second side. Particularly, a method of supplying a driving power to an element at the primary side of the power supply apparatus from a primary coil of a transformer... | 01/11/2011 |
| 7839661 | Power supply control circuit having controllable switch and liquid crystal display using the same An exemplary power supply control circuit (200) includes a first port (201), a second port (202), a third port (203), a controllable switch (280), and a control circuit (270). The first and second ports are configured to rec... | 11/23/2010 |
| 7791906 | DC to DC converter module Lower surface terminals are disposed at the lower surface of a magnetic substrate. An upper surface electrode is disposed at the upper surface of the magnetic substrate. A control circuit, an input capacitor, and an output capacitor are mounted on the upper surface ... | 09/07/2010 |
| 7773391 | Direct current to direct current converter with single ended transformer and pulse reverse circuit An exemplary DC to DC converter (200) includes a first DC input (210) connected to a first DC power supply; a second DC input (220) connected to a second DC power supply; a transformer (230) including a primary winding (231), a sub... | 08/10/2010 |
| 7746670 | Dual-transformer type of DC-to-DC converter A first AC/DC converter circuit is coupled via two transformers to a second AC/DC converter circuit, the first AC/DC converter circuit having a symmetrical configuration of two switching elements performing complementary opened/closed switching, to alternately conne... | 06/29/2010 |
| 7738265 | Control system for a voltage converter and method A control arrangement for a voltage converter includes a first input electrically connected to a device configured to sense a first current in a primary side of a transformer and a first output electrically connected to a control terminal of a transistor. The transi... | 06/15/2010 |
| 7729134 | Power conversion circuit, driving method and drive unit thereof A power conversion circuit capable of varying an output voltage within a range from a negative voltage lower than a ground voltage to a positive voltage higher than a supply voltage, and a driving method and a drive unit are provided. A power conversion circuit incl... | 06/01/2010 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
