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| Number | Title | Issue Date |
| 8184455 | Power adapter having power factor correction circuit, switch voltage regulation circuit and voltage stabilization circuit controlled by feedback signal A power adapter to receive at least one AC input power and transform to DC primary output power includes a power factor correction circuit to receive the AC input power and modulate to become a modulated power, an isolation voltage step-down circuit connecting to th... | 05/22/2012 |
| 8094466 | Resonant converter The invention relates to a resonant converter (1) which has multiple outputs (7a, 7b) and contains a transformer (4) with a primary winding (5) and at least two secondary windings (6a, 6b) ... | 01/10/2012 |
| 8081492 | Switching power supply with smoothing circuitry for more stable output The first choke coil and the third choke coil are not magnetically coupled to the second choke coil and the fourth choke coil. Therefore, even in a case where a structure for increasing the heat radiation area is adopted, a pair of the first and third choke coils an... | 12/20/2011 |
| 8077482 | DC-DC converter Provided is a DC-DC converter that can reduce losses. Ein and C1 are serially connected. Q1 and Q2 are serially connected so that antiparallel diodes thereof face the same direction. A terminal of C1 that is not connected to Ein and a ter... | 12/13/2011 |
| 8064226 | Control circuit with frequency compensation The present invention discloses a control circuit with frequency compensation, which can be applied to an open-loop control system. The control circuit includes an oscillator which is additionally connected to a first comparator including a first input end, a second... | 11/22/2011 |
| 8054650 | Switching power supply circuit and driving method thereof A switching power supply circuit includes a direct current (DC) power supply input, a first transistor, a capacitor, a first resistor, a second resistor, a switching circuit including a second transistor, and a first transformer including a first primary winding and... | 11/08/2011 |
| 8050059 | Charging probe circuit Various example embodiments are disclosed. According to one example embodiment, a charging probe may include an alternating current (AC) input configured to receive current from an AC source, a rectifier circuit configured to rectify the current received from the AC... | 11/01/2011 |
| 8027174 | Adapter power supply An advantage of the present invention is to provide an adapter power supply which varies a link voltage of DC power serving an input power of a DC/DC converter according to variation of a load current estimated by measuring a secondary current using a lossless curre... | 09/27/2011 |
| 8027175 | Power supply adjusting apparatus A power supply adjusting apparatus includes a primary isolation converting unit, adapted to convert voltage or current of an input power supply signal and output a power supply signal that meets an expected voltage or current requirement. The power supply adjusting ... | 09/27/2011 |
| 8018740 | LLC soft start by operation mode switching An embodiment of the invention provides a method of reducing surge current in an LLC converter. The LLC converter comprises a switching circuit having a first switch and a second switch, a resonant circuit, and a rectification circuit. During start up of the LLC con... | 09/13/2011 |
| 8014172 | Control arrangement for a resonant mode power converter A resonant mode power converter is controlled with a control unit including a feedback circuit coupled to generate a first current representative of an output of the power converter. A current limiting circuit is coupled to receive the first current and a second cur... | 09/06/2011 |
| 7986534 | Apparatus to generate high voltage by digital control and method thereof An apparatus to generate a high voltage includes a switching part to control a voltage induced in a secondary coil of a power transforming part, by interrupting a current in a primary coil of the power transforming part, a digital controlling part to control the int... | 07/26/2011 |
| 7957160 | Current waveform construction to generate AC power with low harmonic distortion from localized energy sources Methods and apparatus to provide low harmonic distortion AC power for distribution by converting energy from natural or renewable sources into electrical form, and constructing a current waveform on a primary winding of a transformer by recapturing inductive energy ... | 06/07/2011 |
| 7952892 | DC converters with constant and variable duty ratio switching A DC converter comprises a half bridge supply circuit and one or more flyback or forward converter output circuits, and optionally also an LLC converter whose control can determine a common variable switching frequency. The half bridge supply circuit produces a 50% ... | 05/31/2011 |
| 7944713 | Electric power conversion circuit having transfer gain variable by pulse-width modulation The present invention discloses a single stage DC to DC electric power conversation circuit which has a transfer gain variable by pulse-width modulation over a continuum from zero to beyond unity. Conversion efficiency of the circuit is optimal when the transfer gai... | 05/17/2011 |
| 7936573 | Bi-directional DC-DC converter and control method A bi-directional DC-DC converter uses a transformer for both step-down and step-up operations. A switching frequency for operating a switching device is set separately for the step-down and step-up operations. When, for example, the switching frequency during the st... | 05/03/2011 |
| 7916503 | DC-DC converter, power supply voltage supplying method, and power supply voltage supplying system According to one aspect of the invention, a DC-DC converter including a soft-start function of a soft start in response to a soft-start signal, comprises: a detection circuit that detects whether the soft-start signal is active at an end of a soft-start operation; a... | 03/29/2011 |
| 7911809 | Switching power supply circuit A switching power supply circuit includes a direct current (DC) power supply input terminal, a first transformer including a first primary winding, a second transformer, and a pulse generating circuit, and a startup circuit. The pulse generating circuit includes fir... | 03/22/2011 |
| 7911808 | Primary side constant output current controller with highly improved accuracy A comparing circuit and a control loop are used to maintain the peak level of current flowing through an inductor of a flyback converter. An inductor switch control signal controls an inductor switch through which the inductor current flows. The inductor current inc... | 03/22/2011 |
| 7903433 | Current balancing for multi-phase converters A converter for a multi-phase current network can include a plurality of current sensors, each of the plurality of current sensors being configured to detect current for a respective phase of the multi-phase network. A current averaging circuit is configured to prov... | 03/08/2011 |
| 7894212 | Switching power supply device A switching power supply device includes a first series circuit of first and second switching elements connected in parallel with a DC power supply. An isolation transformer has primary and secondary windings and first and second auxiliary windings, a first layer in... | 02/22/2011 |
| 7889517 | Power system with power converters having an adaptive controller A power system having a power converter with an adaptive controller. The power system is coupled to a load and includes a power system controller that receives a signal indicating a system operational state of the load and selects a power converter operational state... | 02/15/2011 |
| 7876581 | Power converter transformer for suppressing conduction EMI and power supply having its transformer In accordance with the present invention, a power converter transformer for suppressing conduction EMI (ElectroMagnetic Interference) includes a primary winding positioned at a primary side; a secondary winding positioned at a second side and coupled with the primar... | 01/25/2011 |
| 7859859 | Primary side sampled feedback control in power converters A primary-side sampled feedback system includes a sample acquisition phase during which the voltage across the clamp capacitor is sensed as a measure of the primary-reflect output voltage. One end of the clamp capacitor is ground-referenced during the sample acquisi... | 12/28/2010 |
| 7859860 | Switching power source device, switching power source control circuit, and switching power source device control method A switching power source device for supplying power to a load includes a series resonant circuit, a plurality of main switch elements or main switch element groups for switching a current path of the series resonant circuit, a transformer for inducing a secondary cu... | 12/28/2010 |
| 7848117 | Control arrangement for a resonant mode power converter The switching frequency of an LLC converter is controlled by a control unit to which a feedback circuit provides a first current dependent upon the output voltage of the converter. An oscillator circuit produces a sawtooth waveform at a frequency dependent upon the ... | 12/07/2010 |
| 7843706 | Circuit controller, inrush current limiting circuit, inrush current limiting circuit with battery, inverter, and inverter with battery An inverter according to the invention includes an open circuit instructing device (ECU, Steps S5 to S8). The open circuit instructing device is for opening a switching circuit based on resistor inter-terminal voltage Vrb and resistor current Irb. ... | 11/30/2010 |
| 7839660 | Method and apparatus for regulating an output current from a power converter Techniques are disclosed to regulate an output current through a load coupled to a power converter using a current source coupled to the load. For instance, one power converter according to the teachings of the present invention includes an energy transfer element c... | 11/23/2010 |
| 7839659 | Alternating current power supply device and integrated circuit for alternating current power supply device An alternating current power supply device is provided with switch elements Q1, Q2 for converting direct current power from a direct current power supply Vin into alternating current power; a transformer T1 for converting the voltage of the alte... | 11/23/2010 |
| 7830674 | Single-stage switching power supply A single-stage switching power supply includes a transformer, a voltage level generation circuit, a first switching circuit, a second switching circuit, a rectifying and filtering circuit, a feedback circuit and a control circuit. The rectifying and filtering circui... | 11/09/2010 |
| 7796404 | LLC converter synchronous FET controller and method of operation thereof A method for operating a power controller is provided. The method includes activating a rectifying FET upon a detection of an activation body diode conduction current occurring in the rectifying FET. The method generates an activation signal for a corresponding prim... | 09/14/2010 |
| 7791903 | DC-DC flyback converter having a synchronous rectification self-driven circuit A DC-DC flyback converter, includes a three-winding transformer; a primary power circuit having a first MOSFET connected to a first winding of the transformer; a secondary power circuit connected to a second winding of the transformer terminals; and a self-driven ci... | 09/07/2010 |
| 7778046 | Voltage step-up switching DC-to-DC converter field of the invention A non-isolated and isolated both polarity non-inverting and polarity inverting switching DC-to-DC converters with three switches are provided with a basic voltage step-up DC gain characteristics and a very efficient operation without a danger of voltage overstress o... | 08/17/2010 |
| 7778047 | Inverter Primary and secondary regions are electrically insulated from each other. The first and second pulse transformers are provided to the respective transistors in the switching circuit. Secondary windings of the first and second pulse transformers are connected to cont... | 08/17/2010 |
| 7755914 | Pulse frequency to voltage conversion A power supply apparatus and method of regulating is provided. A converter circuit includes a primary switching element and an auxiliary switching element. The auxiliary switching element is for transferring a reflected voltage signal. A transformer includes a prima... | 07/13/2010 |
| 7742318 | Multi-element resonant converters A resonant switched power converter having switching frequency controlled in response to an output voltage thereof achieves over-current protection such as at start-up or under short circuit conditions using a resonant tank circuit which provides a notch filter in a... | 06/22/2010 |
| 7742317 | Precharging boost converters in DC to DC power converters A method and apparatus for precharging a DC to DC power converter system is provided. The system includes a boost circuit for generating a boosted output voltage from an input voltage. The input voltage is monitored. A predetermined current limit is compared to a cu... | 06/22/2010 |
| 7733669 | Resonant converter and burst mode starting method thereof A resonant converter and burst mode starting method thereof are provided. The resonant converter includes a converting stage, a transformer to induce the output of converting stage from the primary side to the secondary side, a rectifying stage to rectify the output... | 06/08/2010 |
| 7729133 | Secondary side-driven half-bridge power supply The present invention discloses a secondary side-driven half-bridge power supply, which has a half-bridge transformer. A MOSFET unit is connected to the primary side of the half-bridge transformer, and an output rectifier/filter circuit connected to the secondary si... | 06/01/2010 |
| 7706153 | DC-DC Converter A DC-DC converter includes a switching circuit having first and second switching elements to which a direct current voltage is supplied, the first and second switching elements periodically operated so that one of the switching elements is turned on while the other ... | 04/27/2010 |
