Quotables
"Radio has no future."
Lord Kelvin, British mathematician and physicist ; 1897
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 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 normally-open branch circuit coupled in parallel to the first current l... | 05/15/2012 |
| 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 electrode operates the reverse state and the forward state between the switch... | 04/24/2012 |
| 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 system characteristics are used to derive expected converter voltage val... | 04/19/2011 |
| 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 coupled to an inverter. A first controller generates a firing angle for... | 01/04/2011 |
| 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 indicates that power should be redirected, or whenever a phase voltage conn... | 12/07/2010 |
| 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 configured to provide a timing signal corresponding to a dead time of... | 11/09/2010 |
| 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), and a control circuit (26). The fi... | 03/23/2010 |
| 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 metals. Rectifier diodes in a rectifier circuit are connected between the t... | 11/24/2009 |
| 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 modulation triangle comprising vertex vectors; a duty ratio calculator for ... | 07/07/2009 |
| 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 inducing energy from the primary coil receiving the primary current.... | 03/17/2009 |
| 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 input connections for input of AC voltage; and a second diode for dischar... | 12/23/2008 |
| 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 the power converter. Output terminals are included in a secondary cir... | 11/18/2008 |
| 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 resonant circuit to which the snubber circuit is connected. The current... | 08/05/2008 |
| 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 in the direction of suppressing reverse voltages (surge voltages) appl... | 07/29/2008 |
| 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 operation. In one embodiment, the active circuit includes high volta... | 07/08/2008 |
| 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 in parallel. The current limiting resistor of the first control unit... | 05/27/2008 |
| 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 active control of the converter including identifying supply line peak am... | 04/08/2008 |
| 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 includes a plurality of pairs of switching devices. Each pair is associate... | 02/26/2008 |
| 7330018 | Step-down controller circuit A step-down controller has an input having a first and a second input terminal for applying an input voltage, an output having a first and a second output terminal at which an output voltage can be provided, a series circuit including a switch and an inductance whic... | 02/12/2008 |
| 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 consists of transformers each has at least one high voltage power and one lo... | 12/18/2007 |
| 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 device, where the rectification device is capable of being controlle... | 10/16/2007 |
| 7279773 | Protection device for handling energy transients A protection device for handling energy transients includes a plurality of basic unit Zener diodes connected in series to achieve a desired breakdown voltage. Each of the basic unit Zener diodes is formed in a first-type substrate. Each of the basic unit Zener diode... | 10/09/2007 |
| 7271579 | AC signal level detection circuit An AC voltage generated by an AC power source 1 is rectified by a full-wave rectifying circuit 2, which generates a rectified voltage. An internal regulator 33 performs waveform shaping of the rectified voltage. A comparator 42 compares t... | 09/18/2007 |
| 7233507 | Non dissipative snubber circuit with saturable reactor A new type of the passive non-dissipative snubber with a single saturable reactor improves the performance of the boost converter used as a front-end active Power Factor Correction (PFC) in two critical areas: excess voltage stresses caused by high voltage spikes on... | 06/19/2007 |
| 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 IC. The photocoupler receives an original ... | 05/22/2007 |
| 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, comprises a detection/amplification circuit 210 which includes... | 04/24/2007 |
| 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 capacitance interposed between the AC power source and the rectifier... | 03/27/2007 |
| 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 diodes having two anodes coupled to each other at a common-anode terminal... | 02/27/2007 |
| 7173834 | Half-controlled silicon-controlled rectifying system and method thereof A half-controlled silicon control rectifying system and method thereof are provided. In this case, the first detection unit detects the zero cross phase of the triphase AC in input port thereof. The second detection unit detects the voltage of the DC bus. Then the c... | 02/06/2007 |
| 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 terminal. The clamping circuit includes a switching circuit connected betwee... | 01/30/2007 |
| 7133301 | 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 operation. In one embodiment, the active circuit includes high volta... | 11/07/2006 |
| 7130203 | Switching power supply with a snubber circuit A DC/DC power supply with two transformers (10, 20), which for example are connected in parallel on the primary and in series on the secondary side, comprises two passive, non-dissipative snubber circuits (1.1, 1.2). Each snubber circuit comprises a se... | 10/31/2006 |
| 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, comprising for each electrical phase a self-damped inductor having a comple... | 10/03/2006 |
| 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 communicates with the input circuit and a secondary winding. An output cir... | 09/12/2006 |
| 7099134 | Apparatus for protecting boost converter in abnormal operation An apparatus for preventing a boost converter from an abnormal operation is provided. The boost converter includes a transformer, a full-wave rectifier circuit electrically connected to a secondary winding of the transformer, an output filter inductor, an output fil... | 08/29/2006 |
| 7095215 | Real-time voltage detection and protection circuit for PFC boost converters A circuit for providing protection for power factor correction (PFC) boost converters from conditions such as input voltage surges that can otherwise cause failure. The circuit also prevents unnecessary down time of the boost converter after a power failure or on st... | 08/22/2006 |
| 7088595 | Reversible buck-boost chopper circuit, and inverter circuit with the same In a reversible buck-boost chopper circuit, a first half-bridge circuit has a first switching element with a high-side main electrode connected to a positive electrode of a DC power source, and a second switching element is connected to the first switching element a... | 08/08/2006 |
| 7050278 | Motor controller incorporating an electronic circuit for protection against inrush currents Inrush currents in the dc intermediate circuit of a motor controller necessitate the incorporation of protection circuits. These circuits usually take the form of a resistor inserted in series with the intermediate circuit, and the resistor is short-circuited after ... | 05/23/2006 |
| 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 connected to the rectifying diode in parallel thereto. The constant ... | 03/28/2006 |
| 6999326 | Drive controller for a self-commutated converter A drive controller for a self-commutated converter is described. The converter has two half-bridges, and the drive controller includes a corresponding control circuit for the converter valves of each half-bridge. Each control circuit can be connected via first switc... | 02/14/2006 |
