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| Number | Title | Issue Date |
| 8059429 | Using output drop detection pulses to achieve fast transient response from a low-power mode In a first aspect, in a Primary Side Regulation (PSR) power supply, some primary current pulses are used to forward bias an output diode such that an auxiliary winding voltage can be properly sampled after each pulse. The samples are used to regulate the power suppl... | 11/15/2011 |
| 8035997 | Control arrangement and circuit arrangement for converting a DC voltage into a rectified voltage Circuitry includes an acquiring circuit to acquire period and phase information of an oscillation. The acquiring circuit includes a first input electrically coupled to a first connection and a second input electrically coupled to a second connection. The first conne... | 10/11/2011 |
| 8014174 | Image forming apparatus The present invention can include an image forming apparatus having an electrical load, a supplying circuit configured to supply an electrical power to the electrical load, and an output circuit configured to output a voltage according to a current value of the elec... | 09/06/2011 |
| 7791905 | Electrical DC-DC power converter with magnetically coupled switch control circuit Power converter with a controllable first switch and a diode and a controllable second switch and a second diode, a transformer with a primary winding and a secondary winding, of which the secondary winding forms at least part of a control circuit for the first swit... | 09/07/2010 |
| 7787262 | Capacitor charging methods and apparatus A capacitor charging circuit is provided with a primary side output voltage sensing circuit including an RC network having an RC time constant with a predetermined relationship to the RC time constant of the output capacitor. Once the capacitor voltage reaches a ful... | 08/31/2010 |
| 7724544 | AC power supply apparatus An AC power supply apparatus used for an AC load of a high voltage such as a cold cathode tube. When a cold cathode tube is caused to emit a light, a DC voltage is on/off controlled at a predetermined ratio; thereafter, an AC signal of a high frequency is applied to... | 05/25/2010 |
| 7596002 | Power conversion system and method A power conversion system comprises a converter coupled to a power source and configured to convert a DC power to a variable AC power signal. The power conversion system may further comprise a process control unit coupled to the converter and configured to control t... | 09/29/2009 |
| 7515440 | Method and apparatus for output voltage regulation in primary control switched mode power supplies A voltage sense circuit and power supply regulation technique. In one aspect, a voltage sense circuit utilized in a power supply regulator includes a transformer including a sense winding and an output winding. A first diode is coupled to the sense winding, a first ... | 04/07/2009 |
| 7391627 | Power converter A power converter comprises an inductor (LP) and a controllable switch (CF) coupled to the inductor. A switch controller (1) supplies a periodic switching signal (VC1) which has a repetition time and a duty cycle to the controllable switch (CF) to gene... | 06/24/2008 |
| 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 |
| 7359220 | Control circuit for controlling a switch based on a voltage of an auxiliary winding in a switching power supply The present invention refers to a control circuit and an associated method of controlling the output voltage of a primarily controlled power switching supply with a primary-sided switch and a transformer with an auxiliary winding, in which after opening the primary-... | 04/15/2008 |
| 7356588 | Circuits and methods for detecting the presence of a powered device in a powered network Circuits and methods for detecting the presence of a powered device in a powered network connection and removing power from the powered network connection when no powered device is present are disclosed. The circuits and methods involve applying a time-varying volta... | 04/08/2008 |
| 7355300 | Solid state turbine engine ignition exciter having elevated temperature operational capability A turbine engine ignition exciter circuit applies energy stored in the exciter tank capacitor to the load (igniter plug) through a thyristor type semiconductor switching device that minimizes leakage current at elevated operating temperatures. The semiconductor swit... | 04/08/2008 |
| 7339800 | Switching power source device of resonance type capable of controlling switching loss and noise A switching power source device of resonance type is provided which comprises an output voltage detector 18 for detecting output voltage on a load 13 to produce a detection signal; and a control circuit 2 for applying on-off signals Vg1 | 03/04/2008 |
| 7317624 | Power factor correction method and apparatus and power supply using the same A power factor compensation method and apparatus adapted for use in a power supply which provides direct-current (DC) power via a capacitive input type smoothing circuit, and an improved power supply using the same. The power factor compensation method can correct a... | 01/08/2008 |
| 7315130 | Switching control for inverter startup and shutdown An electronic ballast circuit for a lamp is described, wherein the ballast comprises a power factor correction circuit coupled to an inverter circuit. The inverter circuit is further coupled to a trigger circuit, which is in turn operatively connected to a hot or ne... | 01/01/2008 |
| 7274155 | Flash lamp drive circuit The invention provides a power supply or drive circuit for a pulsed flashlamp which utilizes a two-core component having common windings as both an inductor for arc mode drive and for breakdown triggering of the lamp. Discharge of a capacitor through the inductor an... | 09/25/2007 |
| 7235956 | Step up switching converter A step up switching converter is disclosed. The switching converter comprises a first semiconductor switch arranged in series connection with a storage inductor and a sensor resistor. The control electrode of the first semiconductor switch is connected via a resisto... | 06/26/2007 |
| 7218500 | High-voltage generator and accelerator using same In a high-voltage generator including a CW circuit (high-voltage circuit), where the CW circuit generates a high voltage through booster circuits that are provided for boosting an input voltage and connected to one another in multiple stages, a conductive shielding ... | 05/15/2007 |
| 7202640 | Power factor improving circuit The power factor improving circuit has a current detecting resistor Rsh for detecting current conducting through a set up reactor L1 or current conducting through a switch Q1, an output voltage detector 11 which amplifies a difference between ou... | 04/10/2007 |
| 7196915 | Integrated transformer based step-up converter A step-up converter based on an integrated transformer, comprising a self-resonating oscillator circuit that has inductive elements constituted by primary and secondary windings of at least one first transformer, the self-resonating oscillator circuit being powered ... | 03/27/2007 |
| 7187563 | DC/DC converter with multiple mutually-isolated power sources An electronic circuit includes a first power source, a second power source, a load, and a converter connected to each power source and the load. The converter has (i) a first oscillator circuit connected to the first power source, (ii) a second oscillator circuit co... | 03/06/2007 |
| 7173830 | Device for converting an AC voltage from a main electricity supply to a DC voltage at a predetermined level and waveform The present invention relates to a device (10) for converting an AC voltage from the mains electricity supply into a DC voltage of predetermined level (and waveform), comprising:—a rectifier circuit (16, 17, 18, 19) for connecting to the mains electr... | 02/06/2007 |
| 7173380 | Push-pull driver with null-short feature A push-pull driver for powering fluorescent lamps in a backlight system includes a transformer with three primary windings to realize the advantages of both a push-pull switching topology and a full-bridge switching topology. The first and the second primary winding... | 02/06/2007 |
| 7161305 | Method and apparatus for single-ended conversion of DC to AC power for driving discharge lamps The present disclosure introduces a simple method and apparatus for converting DC power to AC power, and, specifically, to single-ended inverter circuits for driving discharge lamps such as a Cold Cathode Fluorescent Lamp (CCFL) or an External Electrode Fluorescent ... | 01/09/2007 |
| 7142997 | Automatic power factor corrector A computer controlled solid-state switching power factor corrector, which senses the phase angle of each phase of the current as well as the voltage and automatically aligns the current phase angle to the voltage phase angle. This power factor correction is designed... | 11/28/2006 |
| 7142437 | Method and apparatus for output voltage regulation in primary control switched mode power supplies A voltage sense circuit and power supply regulation technique. In one aspect, a voltage sense circuit utilized in a power supply regulator includes a transformer including a sense winding and an output winding. A first diode is coupled to the sense winding, a first ... | 11/28/2006 |
| 7129669 | Motor controller, semiconductor integrated circuit, indicating instrument and method for controlling a motor A motor controller comprising, a detector configured to perform a difference processing for information relating to a counter electromotive force and an induced electromotive force generated by a stepping motor, and to generate a driving control signal based on a re... | 10/31/2006 |
| 7119499 | Switching power device A switching power device uses a non-capacitor flyback converter circuit not provided with a smoothing input capacitor having a large capacity. Therefore, a power harmonic can be suppressed and a rush current preventing element is not required. A fluctuation in an ou... | 10/10/2006 |
| 7113412 | Drive circuit and power supply apparatus In charging a gate of a NMOS transistor Q1, the charging speed is adjustable by varying a resistor R1. When an inputted pulse signal VIN reverses to a negative voltage, a diode D2 turns off. Then, current flows along a discharging loop formed by... | 09/26/2006 |
| 7106602 | Switching-bursting method and apparatus for reducing standby power and improving load regulation in a DC—DC converter A circuit and corresponding method for reducing standby power and improving no-load to full-load regulation for ringing choke converters by maintaining a reduced duty cycle, with longer off time at no-load, while maintaining the output voltage swing closer to the fu... | 09/12/2006 |
| 7027313 | Constant voltage output control method and constant voltage output control device for switching power supply circuit The present invention provides a constant voltage output control method and a constant voltage output control device for a switching power supply circuit that allow accurate execution of a constant voltage control of an output voltage, even if there is variation in ... | 04/11/2006 |
| 7027312 | Method and apparatus for output voltage regulation in primary controlled switched mode power supplies A voltage sense circuit and power supply regulation technique. In one aspect, a voltage sense circuit utilized in a power supply regulator includes a transformer including a sense winding and an output winding. A first diode is coupled to the sense winding, a first ... | 04/11/2006 |
| 6989997 | Quasi-resonant DC-DC converters with reduced body diode loss Buck converters having a resonant inductor Lr, resonant capacitor Cr, and synchronous switch Q3 that together provide reduced switching loss and soft switching. In operation, the resonant inductor Lr is charged during a time period A. Then, Lr is freewheeling... | 01/24/2006 |
| 6985368 | Method and apparatus for output voltage regulation in primary controlled switched mode power supplies A voltage sense circuit and power supply regulation technique. In one aspect, a voltage sense circuit utilized in a power supply regulator includes a transformer including a sense winding and an output winding. A first diode is coupled to the sense winding, a first ... | 01/10/2006 |
| 6956335 | Circuit arrangement A circuit arrangement for operating a lamp including a first circuit and a second circuit. The first circuit generates a second DC voltage from a first DC voltage and includes a transformer. The second circuit is coupled to the secondary winding of the transformer a... | 10/18/2005 |
| 6949888 | Dimming ballast control IC with flash suppression circuit A dimming electronic ballast control provides flash suppression by igniting the fluorescent lamp at a high power level, and then reducing the power output level to the appropriate dimming set level. The electronic ballast includes an integrated circuit that uses clo... | 09/27/2005 |
| 6909622 | Quasi active power factor correction circuit for switching power supply A switching power supply AC-DC-DC or AC-DC-AC with power factor corrector function is provided. The switching power supply circuit includes a quasi active shaping function that shapes an input current of a power line. In the whole system, the active switch or switch... | 06/21/2005 |
| 6862196 | Integrated switch with RF transformer control The invention concerns a control circuit for controlling a power switch by means of a galvanic insulation transformer, the transformer being produced in the form of planar conductive windings on an insulating substrate (20) whereon are integrated passive comp... | 03/01/2005 |
| 6775155 | Method and apparatus for output voltage regulation in primary controlled switched mode power supplies A voltage sense circuit and power supply regulation technique. In one aspect, a voltage sense circuit utilized in a power supply regulator includes a transformer including a sense winding and an output winding. A first diode is coupled to the sense winding, a first ... | 08/10/2004 |
