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Interleaved soft switching bridge power converter

Patent Number: 8111531
Publication Date: 2012-02-07
Inventor: Ilic, Milan

An interleaved soft switching bridge power converter comprises switching poles operated in an interleaved manner so as to substantially reduce turn-on switching losses and diode reverse-recovery losses in the switching pole elements. Switching poles are arranged into bridge circuits that are operated so as to provide a desired voltage, current and/or power waveform to a load. By reducing switching turn on and diode reverse recovery losses, soft switching power converters of the invention ...

3-level power converter

Patent Number: 8111530
Publication Date: 2012-02-07
Inventors: Ono, Yoshitaka; Tanaka, Takeshi

A 3-level power converter is provided, which is reduced in size of the converter, reduced in floating inductance of each of wirings interconnecting between respective elements, and easily attached with a snubber circuit. The 3-level power converter performs on/off control of first to fourth switching elements 1 to 4 so as to output a 3-level voltage from an AC output terminal AC, wherein the power converter has a first module 11 including the first and fourth switching ...

Over current protection circuit and power converter using the same

Patent Number: 8111529
Publication Date: 2012-02-07
Inventors: Hsieh, Chih-Yuan; Cheng, Lan-Shan

An over current protection circuit and a power converter using the same. The over current protection circuit includes a soft start cell and an operational amplifier. The soft start cell outputs a soft start signal according to a direct current (DC) level, and the soft start signal increases progressively to the DC level in a soft start interval. The operational amplifier outputs an over current signal to a feedback control circuit according to the soft start signal and an inductance current ...

DC to AC inverter

Patent Number: 8111528
Publication Date: 2012-02-07
Inventors: Chen, Chun-Han; Kao, Ming-Sheng; Wu, Chin-Chang; Lai, Li-Hsiang; Feng, Ya-Tsung

A DC to AC inverter has a DC power input port, a buck converter, a buck/boost converter, an output filter and an AC output port. The DC power input port has a positive input terminal and a negative input terminal, both connected to a DC source. The AC output port is connected to a single-phase utility system. When the single-phase utility system is in positive half cycle, the buck converter generates a positive half-cycle signal of sinusoidal current. When the single-phase utility system is ...

Power converter

Patent Number: 8107269
Publication Date: 2012-01-31
Inventors: Nakajima, Yuki; Imazu, Tomoya; Mizukoshi, Yukio

An apparatus to convert a direct current to an alternating current includes a power module disposed between an input terminal of the direct current and output terminal of the alternating current, the power module comprising an on/off switch element, a first smoothing condenser connected in parallel with the power module, a second smoothing condenser connected in parallel with the power module, the second smoothing condenser comprising an electrostatic capacity less than the first smoothing ...

Passive lossless snubber cell for a power converter

Patent Number: 8107268
Publication Date: 2012-01-31
Inventors: Chung, Shu Hung; Li, Tin Ho

A passive lossless snubber cell for a switched-mode power converter comprises an energy absorbing circuit and an energy resetting circuit coupled to said energy absorbing circuit. The energy absorbing circuit is arranged to release energy stored in a snubber capacitor of the energy absorbing circuit to a storage capacitor of the energy resetting circuit through a resonant pathway of the snubber cell in response to a first switching action of a power converter transistor switch. The energy ...

Systems and methods for common-mode voltage reduction in fully regenerative AC drives

Patent Number: 8107267
Publication Date: 2012-01-31
Inventors: Leggate, David; Tallam, Rangarajan; Kerkman, Russel

Control systems, methods and fully regenerative power conversion systems are presented for mitigating common mode voltages in AC loads by employing inverter and/or active rectifier PWM control using switching sequences with only active vectors where a first vector of each switching sequence differs by one phase switching state from a last vector of a switching sequence of an adjacent ...

Converter for converting alternating voltage into direct voltage and conversely

Patent Number: 8107266
Publication Date: 2012-01-31
Inventors: Hedblad, Per-Olov; Karlsson, Patrik; Dahlgren, Stellan; Chataignere, Fabienne

A converter for converting alternating voltage into direct voltage and vice versa in a converter station of a high voltage transmission system including a series connection of a plurality of converter valves. The converter has connections to transformers on both of two opposite sides of the converter ...

Current balanced push-pull inverter circuit with regeneration snubber circuit and voltage boost section

Patent Number: 8107265
Publication Date: 2012-01-31
Inventors: Morimoto, Kenji; Fujiyoshi, Toshikazu; Yamamura, Satoshi; Katsushima, Hajime

This inverter circuit includes two switching elements which are turned alternately ON and OFF, and a first primary winding connected in series between these switching elements, and also includes an output transformer having a secondary winding for obtaining an output voltage. This inverter circuit also includes a first voltage source and a second voltage source. The first voltage source applies a voltage to the first switching element via the first primary winding. And the second voltage ...

Slope compensation method and circuit for a peak current control mode power converter circuit

Patent Number: 8107264
Publication Date: 2012-01-31
Inventor: Chiu, Jui-Yang

A slope compensation method and circuit for a peak current control mode power converter circuit is provided. Since the power converter circuit has a synchronous signal of a driven signal of enabling the first primary switch and the second primary switch, a triangular wave signal is generated. The driven signals of the first and second primary switches determine the ramp up time of the triangular wave signal. The triangular wave signal is added to one of the output DC voltage feedback signal ...

Series resonant converter

Patent Number: 8107263
Publication Date: 2012-01-31
Inventors: Saito, Atsushi; Ueno, Shingo; Omaki, Shinichi; Watanabe, Kiyomi

A series resonant converter circuit that reduces power loss is provided that includes an inverter circuit having at least a pair of first and second switching elements that is connected between DC input terminals, a transformer connected to this inverter circuit, a resonant inductance means that are connected in series to a primary winding wire or a secondary winding wire of the transformer, a primary-side resonant capacitor that is connected in series to the resonant inductance means ...

Variable switching frequency type power supply

Patent Number: 8107262
Publication Date: 2012-01-31
Inventors: Roh, Chung Wook; Han, Sang Kyoo; Oh, Dong Seong; Won, Jae Sun; Hong, Sung Soo; Kim, Jong Sun; Heo, Tae Won; Kim, Dong Joong; Kim, Don Sik; Kim, Hak Ryong

There is provided a variable switching frequency type power supply that can achieve high efficiency by fixing a switching duty cycle to 50% and varying switching frequency. A variable switching frequency type power supply according to an aspect of the invention may include: a switching unit switching input power; a transformation unit converting a voltage level of the power switched by the switching unit into a predetermined voltage level; a rectification unit rectifying the power converted ...

Powering unit with full bridge and wide adjusting range circuit

Patent Number: 8107261
Publication Date: 2012-01-31
Inventors: Kogard, Markus; Cesnak, Lorand

There is described a powering unit comprising at least one transformer, at least one full bridge circuit via which a primary winding of the transformer is connected to a direct current voltage input, a secondary winding for triggering an output circuit with an output direct current voltage via a bridge-type rectifier circuit as well as an output choke coil and an output capacitor, and a discharge circuit consisting a diode, for a capacitor and of a resistor for reducing the secondary-side ...

Control apparatus for controlling power conversion apparatus

Patent Number: 8102687
Publication Date: 2012-01-24
Inventors: Kimura, Tomonori; Takasu, Hisashi

The control apparatus is for controlling a power conversion apparatus with a chopper circuit including at least one voltage-controlled type switching element provided with a drive circuit, and a coil to generate back electromotive force. The control apparatus includes a function of outputting an operation command signal to the drive circuit to control an output voltage of the power conversion apparatus, a second function of setting, on the basis a current flowing through the switching ...

Rectifier with PAM controller to force an input current to approximate a sine wave

Patent Number: 8102686
Publication Date: 2012-01-24
Inventors: Hashimoto, Masafumi; Yoshisaka, Keiichi; Katou, Masakazu; Nakamoto, Ryou; Shimatani, Keisuke

An electric power supply circuit includes a diode bridge circuit (12) for rectifying an alternating current, a switching element (S) for causing a short-circuit for output power of the diode bridge circuit (12), and a PAM control section (15) for causing the switching element (S) to perform switching with a predetermined timing so that a waveform of an input current approximates to a sine wave. The PAM control section (15) outputs ON/OFF pulses so that five ...

High voltage power supply

Patent Number: 8102685
Publication Date: 2012-01-24
Inventors: Nagasaki, Osamu; Iida, Masamichi

A high voltage power supply may include a switching unit, a voltage resonant unit, a connection part, a rectifier unit, a voltage amplifying unit, a voltage output unit, and a frequency control unit. The switching unit is driven per a frequency signal. The voltage resonant unit is connected to the switching unit and includes an inductor, to which a voltage is applied, and a capacitor. The connection part connects the switching unit and the inductor. The rectifier unit includes a diode that ...

Relief circuit

Patent Number: 8102684
Publication Date: 2012-01-24
Inventor: Weinmeier, Harald

A circuit arrangement for limiting excessive voltages by a forward delay time of a first diode is described. The first diode is alternately switched in a non-conducting direction and a conducting direction by switching a circuit element. The first diode is series-connected to a first capacitor and a pre-charging circuit is provided for the first capacitor, the pre-charging circuit charging the first capacitor while the first diode is switched in the non-conducting direction. The ...

Phase angle measurement of a dimming circuit for a switching power supply

Patent Number: 8102683
Publication Date: 2012-01-24
Inventors: Pastore, Tiziano; Gaknoki, Yury; Mao, Mingming

An example controller for a switched mode power supply includes a zero-crossing detector, a feedback reference circuit, and a drive signal generator. The zero-crossing detector is coupled to generate a zero-crossing signal representative of a length of time that a zero-crossing condition of an input voltage of the power supply exists. The feedback reference circuit is to be coupled to receive a feedback signal and a reference signal, where the feedback signal is representative of an output ...

Power supply control circuit for an inductive coil used to heat a tool shrink attachment

Patent Number: 8102682
Publication Date: 2012-01-24
Inventors: Haimer, Franz; Fořt, Jiři

A circuit 1 for controlling the supply of electrical power to an induction coil 2, in particular to an induction coil 2 for heating a shrink attachment for tools, comprises a rectifier 3, having an input 3a, 3b, 3c for feeding an input power, and a rectifier output.

The circuit 1 furthermore comprises an inverter 5 for putting out an AC-voltage, having an input and an inverter output 5a, ...

Measurement apparatus, test apparatus, and measurement method

Patent Number: 8102681
Publication Date: 2012-01-24
Inventor: Ushijima, Masakazu

Provided is a transformer, comprising a first winding and a second winding that interlink with a main magnetic flux; and a third winding that interlinks with a magnetic flux leakage interlinking with only one of the first winding and the second ...

Smart driving method for synchronous rectifier and its apparatus thereof

Patent Number: 8102680
Publication Date: 2012-01-24
Inventors: Miao, Lei; Zhang, Junming; Ren, Yuancheng; Mao, Zhaoqi

The present invention discloses a smart driving method for a secondary synchronous rectifier of an isolated converter and its apparatus thereof. The apparatus comprises: a main circuit having a secondary synchronous rectifier Q1; a differentiation filter circuit, filtering the drain-source voltage Vds of the secondary synchronous rectifier, comprising a capacitor and at least one resistor connected in series and outputting a filtered voltage Vf from either between said capacitor and ...

Utilization of a multifunctional pin to control a switched-mode power converter

Patent Number: 8102679
Publication Date: 2012-01-24
Inventors: Kok, Siu Kam; Gong, Xiaowu; He, Yi; Chan, Tuck Meng

An embodiment of the invention relates to a power converter including a resistor divider with an internal node to sense an input line voltage. The internal node is operable as a multifunctional pin. A controller compares a feedback voltage dependent on a power converter output characteristic to a current-sense signal including an offset dependent on a voltage of the internal node to control entry and exit of the power converter from burst mode operation. The node may be employed to manage ...

High power factor isolated buck-type power factor correction converter

Patent Number: 8102678
Publication Date: 2012-01-24
Inventor: Jungreis, Aaron

A regulated power factor corrected power supply apparatus is provided. The apparatus includes an input rectifier circuit for receiving an input AC voltage and outputting a full-wave rectified DC voltage. A single-stage isolated buck-type converter is coupled with the input circuit. The converter circuit comprises an isolated buck-type converter circuit including an isolation transformer. An output rectifier and semiconductor tap switch are coupled to a secondary winding of the isolation ...

Switching power supply device and method for adjusting dead time thereof

Patent Number: 8102677
Publication Date: 2012-01-24
Inventor: Nakanishi, Ryouta

A resonant switching power supply device includes: a first switching element and a second switching element which are configured to convert and adjust power. A capacitance of a first/second gate-drain capacitor existing between a gate and a drain of the first/second switching element and a resistance of a first/second gate resistor of the first/second switching element are set such that, in a period during which a resonance current flows by switching the second/first switching element, a ...

Compensating for cord resistance to maintain constant voltage at the end of a power converter cord

Patent Number: 8102676
Publication Date: 2012-01-24
Inventors: Tao, Zhibo; Huynh, Steven; Grant, Matthew; Kunst, David

A cord correction circuit in a primary-side-controlled flyback converter compensates for the loss of output voltage caused by the resistance of the charger cord. In one embodiment, a correction voltage is subtracted from a feedback voltage received from a primary-side auxiliary inductor. A pre-amplifier then compares a reference voltage to the corrected feedback voltage. In another embodiment, the correction voltage is summed with the reference voltage, and the pre-amplifier compares the ...

Single-stage power supply with power factor correction and constant current output

Patent Number: 8098506
Publication Date: 2012-01-17
Inventor: Saint-Pierre, Roland S.

An example controller includes first, second and third inputs, a delayed ramp generator and a drive signal generator. The first, second and third inputs are coupled to receive an input voltage sense signal, an output voltage sense signal, and an input current sense signal, respectively. The drive signal generator is coupled to receive an input charge control signal generated by an input charge control signal generator and a delayed ramp signal generated by a delayed ramp generator. The ...

Phase management for interleaved power factor correction

Patent Number: 8098505
Publication Date: 2012-01-17
Inventor: Choi, Hangseok

An interleaved power factor correction (PFC) circuit includes phase management to control shedding and adding of channels. The channels may be voltage (e.g., boost) converters connected in parallel. The interleaved PFC circuit can have a first channel and a second channel that operate out of phase of each other to provide input power to a load. In a two phase interleaved PFC circuit, the first and second channels operate 180 degrees out of phase. A channel may be shed or added depending on ...

Converter station for connecting an AC system to an end of an HVDC transmission line

Patent Number: 8098504
Publication Date: 2012-01-17
Inventors: Karlsson, Per H.; Berglund, Sven; Nordström, Nils

A converter station for connecting an AC system to an HVDC transmission line. At least two converters are arranged in two separate converter valve halls. The station includes a separate control device configured to control of each converter and an auxiliary power source configured to provide auxiliary power for each converter. A separate overall control configured to control the overall operation conditions is arranged for each converter making each converter self supporting. The converter ...

Method and apparatus to control a power converter having a low loop bandwidth

Patent Number: 8098503
Publication Date: 2012-01-17
Inventors: Pastore, Tiziano; Matthews, David Michael Hugh; Gaknoki, Yury; Mao, Mingming

A power converter controller is disclosed. An example power converter controller includes a feedback sensor circuit coupled to receive a feedback signal representative of an output of the power converter. The controller also includes a feedback sampling signal generator coupled to generate a feedback sampling signal coupled to be received by the feedback sensor circuit. The feedback sensor circuit is coupled to sample the feedback signal in response to the feedback sampling signal. The ...

System and method for emissions suppression in a switched-mode power supply

Patent Number: 8098502
Publication Date: 2012-01-17
Inventors: Teo, Yong Siang; Mao, Ming Ping; Kok, Siu Kam Eric

In one embodiment, a method of operating a switched-mode power supply that has a switch coupled to a drive signal is disclosed. The method includes deactivating the drive signal at a first instance of time, and comparing a power supply signal to a threshold after deactivating the drive signal. The method further includes activating the drive signal a variable period of time after the power supply signal crosses the ...

Switching power supply control circuit

Patent Number: 8098501
Publication Date: 2012-01-17
Inventor: Sonobe, Koji

A comparator detects whether a feedback signal of an output voltage detecting circuit for a switching power supply circuit reaches a control voltage. A comparator detects an operating state of the switching power supply circuit, which is instructed by a switching instruction signal, by comparing the instruction signal with a reference voltage. The comparators are connected to a decision circuit which outputs to a control circuit a signal instructing a normal state until the feedback signal ...

Phase shift full bridge converter with reduced current stress

Patent Number: 8098500
Publication Date: 2012-01-17
Inventors: Moon, Gun Woo; Kim, Don Sik; Heo, Tae Won; Park, Ki Bum; Kim, Chong Eun; Lee, Woo Jin; Kim, Jong Pil; Bong, Sang Cheol; Kim, Hak Ryong; Kim, Dong Joong

A phase shift full bridge converter with a reduced current stress includes: a switching unit that switches an input voltage; a transformer that includes a first capacitor serially connected to, and having a primary side and a secondary side; an auxiliary circuit unit that includes a first switch, a second switch, and a second capacitor, which are connected in parallel to the secondary side of the transformer; and a rectification unit that is connected to the auxiliary circuit unit, with an ...