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8179704 Electronic device having a circuit protection unit  
An electronic device includes a circuit protection unit providing over-current protection to a main circuit and including a series connection of first and second current limiting circuits, and a...
8164931 Rectifier circuit with a voltage sensor  
A rectifier circuit with a synchronously controlled semiconductor element comprising at least one field effect transistor with a control electrode and two switching electrodes. The control...
8134817 Electrostatic discharge conducting pathway having a noise filter spark gap  
A printed circuit board includes a primary region, a secondary region and an isolation region disposed between the primary region and the secondary region to galvanically isolate the primary region...
8072192 Auxiliary power supply with a coupling capacitor between a high voltage line and ground  
A power supply apparatus includes a coupling capacitor arranged to be connected on its first end to ground; a transformer including a primary winding and a secondary winding; a first rectifier...
8035331 AC/DC converting circuit and motor controller using the same  
An AC/DC converting circuit, has a full-bridge rectifier having two input terminals and two output terminals, a first capacitor, a second capacitor, an electronic switch having a control terminal,...
8008886 Power converter  
A power converter is provided with a rectifying circuit, an inverter circuit, and a common mode filter including a common mode choke coil and a capacitor. The switching frequency of a PWM...
8000116 Output protection circuit of a power converter  
An output protection circuit used for a power converter having an operational amplifier, a diode, a number of voltage-dividing resistors, and a switch tube. In this circuit, the voltage-dividing...
7973494 Electronic ballast with step up/down power factor correction DC-DC converter suitable for high input voltage applications  
Electronic ballasts and buck-boost DC-DC converters therefor are presented with a buck converter with two switching devices connected with two capacitances and two diodes to limit the individual...
7929323 Method and apparatus for pre-charging power converters and diagnosing pre-charge faults  
Power conversion systems and diagnostic techniques are presented for detecting suspected converter faults when a pre-charge circuit is engaged during system startup, in which known or estimated...
7880577 Current doubler rectifier with current ripple cancellation  
A ripple reduction circuit for use in a current doubler rectifier has first and second inductors coupled via a first coupling coefficient. The first and second inductors generate a first and a...
7864552 Intelligent sensorless control of a phase controlled rectifier  
An uninterruptible power supply (“UPS”) has a phase-controlled rectifier coupled to a source of AC power and having an output providing a DC bus, the output of the phase-controlled rectifier cou...
7848123 Current controlled shunt regulator  
A current controlled shunt regulator uses logical OR gates and comparators corresponding to each field effect transistor (FET) shunt to redirect power to a neutral line whenever a controller...
7843709 Rectifier circuit and radio communication device using the same  
A rectifier circuit includes an input terminal that receives an alternating-current signal, a first rectifier circuit that generates a first direct-current voltage from the alternating-current...
7830684 Reverse biasing active snubber  
The present invention provides a transient suppression circuit for use with a rectifier coupled to a transformer. In one embodiment, the transient suppression circuit includes a triggering section...
7817448 Power supply system for reducing reverse current  
The present invention discloses a power supply system for reducing reverse current, the system comprising a primary side circuit, for receiving alternating current; a transformer circuit, for...
7746675 Asymmetrical interleaving strategy for multi-channel power converters  
In a power converter having m=two or more channels of power factor correction (PFC) circuits connected in parallel and an electromagnetic interference (EMI) filter connected in series therewith,...
7733616 Abnormality detecting device of electric power converting device and abnormality detecting method  
Each of three-phase arm of an inverter has first and second switching elements connected in series together at a connection point to the corresponding phase coil of the three-phase motor. Control...
7684218 Method and device for transforming and regulating a voltage signal  
The present invention is generally directed to an efficient voltage transforming and regulating device based on a High Frequency (HF) transformer and a HF Electromagnetic Voltage Regulator (HFEVR)...
7684219 Multiplexed DC voltage regulation output circuit having control circuit for stabilizing output voltages  
An exemplary multiplexed DC voltage regulation output circuit (2) comprises a first output circuit, a second output circuit, a transformer (21), a power control chip (22), a feedback circuit (20),...
7660137 High-voltage modulator system  
A high-power modulation system includes drive circuitry that receives input signals from the signal source via a series of transformers. The drive circuitry amplifies the input signals and provides...
7633771 Method and circuit for controlling a rectifier  
A method for controlling a rectifier, connected to an AC power network, of a drive converter which is provided with a load-end pulse-controlled rectifier is disclosed. An electronically controlled...
7623362 Switching power supply unit  
A switching power supply unit is provided, in which circuit efficiency can be effectively improved compared with a usual case. Secondary windings of a transformer are configured of two sheet...
7577003 Switching power supply  
A switching power source is capable of conducting constant-current drooping control on a load, increasing an energy conversion efficiency on a secondary side, and improving heat radiation...
7558089 Method and apparatus for space vector modulation in multi-level inverters  
An apparatus for space vector modulation of a multi-level inverter, the apparatus comprising: a triangle generator for finding a modulation triangle enclosing a reference voltage vector, the...
7505289 Flyback DC/DC converter using clamp diode  
Provided is a flyback DC/DC converter for a power supply. In the flyback DC/DC converter, a flyback driver unit provides a primary current. A transformer includes a plurality of secondary coils for...
7468897 Rectifier without active switches  
In this power converter, a first capacitor for stepping down of voltage, a first diode for half-wave rectification, and a second capacitor for smoothing are interposed between first and second...
7453710 Transformerless safety isolation in a power supply using safety capacitors for galvanic isolation  
An apparatus and method are disclosed to provide transformerless safety isolation in a power supply. One example regulated power converter includes input terminals included in a primary circuit of...
7408793 Active snubber  
An improved snubber is electrically switched to close a current path to a capacitor (C) in a series connected RC circuit at the onset of an abrupt voltage change otherwise producing ringing in a...
7405955 Switching power supply unit and voltage converting method  
The present invention provides a switching power supply unit and a voltage converting method capable of suppressing a surge voltage applied to an output rectifier element more effectively. Energy...
7397680 Method and apparatus for balancing active capacitor leakage current  
A circuit that provides a method and apparatus to actively balance capacitor leakage current from series stacked capacitors and disconnects itself when stacked capacitors are configured for doubler...
7379311 Inrush current control circuit  
An inrush current control circuit includes a first and second control units connected in series, wherein the first and second control units all have a current limiting resistor and switch connected...
7355865 Method and apparatus for rejecting the second harmonic current in an active converter with an unbalanced AC line voltage source  
A method and apparatus for altering converter control as a function of the degree of unbalance in supply line voltages to substantially eliminate second harmonics on the supply lines caused by...
7336509 Method and apparatus for estimating line inductance for PWM rectifier control  
A rectifier includes a switching circuit and a controller. The switching circuit is coupled between positive and negative buses and a plurality of input voltage sources. The switching circuit...
7310250 Output voltage circuit of power supply  
An output voltage circuit for power supply aims to arrange output DC power according to component voltage and equalizing current. The power supply has a voltage transformation circuit which...
7283377 Method for controlling firing angle under line dip situations  
A method and apparatus for converting AC power into DC power are disclosed, where the method includes receiving the AC power, and converting the AC power into the DC power by way of a rectification...
7221858 Pulse-width modulation motor speed control circuit  
A PWM motor speed control circuit (10) includes a PWM signal generator (20), a driver integrated circuit (IC) (101) and a photocoupler (30) coupled between the PWM signal generator and the driver...
7209842 Activation signal output circuit and determination circuit  
A start signal output circuit having an RF/DC conversion circuit to which radio frequency power (RF) of specified frequency is inputted and from which a direct current potential (DC) is outputted,...
7196918 Capacitive drop power supply with low power consumption  
An improved capacitive drop power supply is provided for use in home appliances. The power supply circuit includes: a rectifier for converting an AC power source to a DC voltage; a current limiting...
7184287 Rectifier clamping circuit with reverse energy recovery  
An energy-feedback clamping circuit of a power converter is proposed. The converter includes a transformer coupled to a full-wave rectifier circuit. The clamping circuit includes: two clamping...
7170760 Switching power supply with clamping circuit  
A switching power supply with clamping circuit includes a clamping circuit between a slave output terminal and a master output terminal thereof, to prevent voltage drift at the slave output...
7116076 Filter network for motor control systems  
Filter network for the reduction of the voltage switching speed between an electrical motor drive and an electrical motor and/or between an electrical distribution network and a motor drive,...
7106605 DC converter circuit with overshoot protection  
A DC-DC converter comprises an input circuit that stores inductive energy that includes a first switch that releases the stored inductive energy. A transformer includes a primary winding that...
7019991 Rectifying circuit  
In a rectifying circuit, a rectifying diode is configured to rectify a first AC voltage to output a first DC voltage. A protection diode circuit has constant reverse voltage diodes and electrically...
6771520 Rectifier of a power supply  
A rectifier of a power supply comprises a delay unit at a front end of a circuit for delaying a transient variation of a power current and then delaying the current to a rectifying end; a driving...
6618276 Power supplies having protection circuits  
A power supply including an inverter receiving a DC input signal from a DC input source (11). The inverter is comprised of two half bridges (S1A, S2A and S1B, S2B). Each inverter is driven by a...
6590792 Noise canceling circuit having a changeover device  
A noise canceling circuit that eliminates noise from an AC current of an AC power supply is provided with a changeover device that brings the noise canceling circuit into and out of conduction with...
6532160 Switching power supply  
A switching power supply comprises a transformer 3, a switching circuit 1, an output rectifier circuit, an output smoothing circuit, and a snubber circuit. A snubber capacitor 17 has one terminal...
6462973 A.C./D.C. converter that automatically adapts to the amplitude of the supply voltage  
An A.C./D.C. converter including a filtering capacitor and further including a first branch essentially including a first rectifying circuit and a current limiting circuit; a second branch...
6181588 Constant polarity input device including synchronous bridge rectifier  
A circuit including bridge rectifier, switches across one or more of the diodes of the bridge rectifier, and a comparator providing control signals to the switch or switches can be constructed to...
6138555 Food processing device and electric system for the processing device, and high voltage-weak pulse electric current impresser for food  
A safer power supply is used in conjunction with a system for preserving food, oil, organs, or other organic material. The power supply constantly applies a high voltage-weak pulse electric...
Matches 1 - 50 out of 118 1 2 3 >