Bizarre Patents
An armor with rollers is provided that enables a user to move in all positions by rolling on a hard and smooth surface while constantly varying his bearing points on the ground.
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 |
| 7782636 | RV converter with current mode and voltage mode switching A switched mode converter is disclosed that includes mode logic for switching between a voltage mode and a current mode. The converter includes circuitry for sensing current on the primary side of the transformer, load current on the secondary side, and output volta... | 08/24/2010 |
| 7633769 | DC-AC converter, and method for supplying AC power First and second semiconductor switches which are activated alternately are provided between ends of a primary winding and a common potential point, wherein a DC power supply voltage is supplied to a center tap. An electric current flowing into a load is fed back to... | 12/15/2009 |
| 7477529 | High-voltage power supply A high-voltage power supply (10) includes: a power scaling section (130) that receives an input voltage signal and converts the input voltage signal to a controllable DC voltage; a push-pull converter (140) for converting the controllable DC vol... | 01/13/2009 |
| 7443701 | Double-ended converter A full bridge inverter includes a push/pull control chip outputting a first control signal and a second control signal. Each duty cycle of the two control signals is smaller than 50%. Moreover, both a first driver and a second driver are coupled to the push/pull con... | 10/28/2008 |
| 7423891 | Inverter device utilizing three switches controlled in a concurrent manner in a resonant transformer Described is an inverter device suitable for driving a cold cathode fluorescent lamp (CCFL), comprising a transformer having a primary winding and a secondary winding. The primary winding has two terminals connected to a return-path terminal of a direct current (DC)... | 09/09/2008 |
| 7372711 | Circuit and method for reducing voltage spikes due to magnetizing current imbalances and power converter employing the same For use in a power converter having parallel power trains, a circuit for, and method of, reducing voltage spikes due to magnetizing current imbalances in the power trains and a power converter incorporating the circuit or the method. In one embodiment, the circuit i... | 05/13/2008 |
| 7352596 | Method of operating a resonant push-pull converter in an above resonant frequency mode A method for operating a push-pull converter in an above resonant frequency operating mode, where the above resonant frequency operating mode produces a switching frequency that is higher than the natural operating resonant frequency of the converter circuit. As a r... | 04/01/2008 |
| 7339806 | Adjustment device for adjusting wave shape of output of a DC-AC inverter A DC-AC inverter has an adjustment device for adjusting wave shape of output thereof includes a feedback circuit, and a zero-crossing detector; the feedback circuit will detect and measure output voltage of the inverter, and feedback-control the inverter to make the... | 03/04/2008 |
| 7339424 | Apparatus and method for controlling temperature of electronic apparatus In an embodiment of this invention, if a state, in which duty ratio of a PWM signal is kept equal to or greater than a predetermined value, has been maintained for a first time period, the duty ratio of the PWM signal of a digital power amplifier is adjusted downwar... | 03/04/2008 |
| 7313005 | PWM circuit control method In the PWM circuit of the present invention, a PWM counter counts clock signals. A reference value setting register sets a comparative reference value for determining a duty ratio of a PWM signal. A comparator generates the PWM signals based on a comparative result ... | 12/25/2007 |
| 7310249 | Switching power supply circuit Enhancement of the power conversion efficiency and reduction of switching noise of a power supply circuit are achieved. The power supply circuit includes, on the primary side, a composite resonance type converter formed from a current resonance type converter and a ... | 12/18/2007 |
| 7289338 | Input to output isolated DC-DC converter In a DC to DC converter, a transformer circuit includes a primary winding and a secondary winding member composed of series-connected first to fourth secondary windings having one and the other ends. The one and the other ends of the series-connected first to fourth... | 10/30/2007 |
| 7285939 | DC-DC converter for boosting input voltage at variable frequency A DC-DC converter for boosting an input voltage to a higher output voltage includes an inductor, a field effect transistor, a first ON signal generating circuit, a second ON signal generating circuit, an OFF signal generating circuit, a transistor driving signal gen... | 10/23/2007 |
| 7272019 | Switching power supply apparatus To provide a switching power supply apparatus which can achieve the followings simultaneously in high levels: the voltage waveform capable of reducing switching noise to the least is in a sine-waveform; capable of providing an output of stable voltage without a cont... | 09/18/2007 |
| 7259474 | Method and apparatus for aggregating power from multiple sources A method and apparatus for aggregating power from multiple sources generates a single direct current regulated voltage. The apparatus comprises a plurality of slave voltage converters and a master pulse width modulator circuit. Providing a plurality of direct curren... | 08/21/2007 |
| 7254000 | Over voltage protection scheme for synchronous buck converter An over voltage protection circuit for single phase and multiphase buck converters. According to one embodiment, upon the occurrence of an over voltage condition, the high side switch is turned Off and the low side switch is On. As the output voltage drops below a l... | 08/07/2007 |
| 7254048 | Power supply capable of AC and DC input utilizing winding of transformer as boost inductor A programmable AC/DC power converter receives a plurality of input voltages and outputs a single voltage from an input voltage system. A transformer receives the single voltage. One of the plurality of input voltages is provided at a center tap of a secondary windin... | 08/07/2007 |
| 7254046 | DC-DC converter In a DC to DC converter, first and second primary windings are magnetically coupled to a first secondary winding. Third and fourth primary windings are magnetically coupled to a second secondary winding. The first and second primary windings are magnetically coupled... | 08/07/2007 |
| 7250743 | Voltage control system The present invention is directed at circuit for controlling a voltage applied to an output voltage terminal from a first voltage level supplied by an input voltage terminal comprising a first switch and a second switch connected in series between said input voltage... | 07/31/2007 |
| 7248488 | DC-AC converter, and method for supplying AC power First and second semiconductor switches which are activated alternately are provided between ends of a primary winding and a common potential point, wherein a DC power supply voltage is supplied to a center tap. An electric current flowing into a load is fed back to... | 07/24/2007 |
| 7242153 | Pulse width modulation inverter circuit and control method thereof A pulse width modulation inverter circuit is provided. The circuit includes a power switch driver, a power switch, a transformer unit, a feedback detector unit, and a voltage control oscillator. The circuit is electrically coupled to the DC power source to drive a l... | 07/10/2007 |
| 7218501 | High efficiency power supply circuit for an electrical discharge weapon An electrical discharge weapon for immobilizing a live target that includes a shock circuit having a low power consumption, a high power efficiency, and/or a low weight. The shock circuit may be entirely contained in a projectile without the need for range limiting ... | 05/15/2007 |
| 7218081 | Power system having multiple power converters with reduced switching loss The present invention includes multiple power converters for driving one or more loads via an input power source, AC or DC. A first switching power converter has first one or more windings coupled to an input power source, and a second switching power converter havi... | 05/15/2007 |
| 7211986 | Inductive charging system An apparatus for inductive charging a battery. The apparatus includes a housing with a lower surface and a charging surface. A rechargeable device with a rechargeable battery may be placed on the charging surface. The apparatus further includes a controller for driv... | 05/01/2007 |
| 7196575 | Polyphase impedance transformation amplifier A method and apparatus for greatly increasing the output voltage or current transformation ratio in an impedance transformation amplifier are disclosed. Broadly, the method takes advantage of multiple, phase-synchronized impedance transformation stages, each of whic... | 03/27/2007 |
| 7196914 | Power converters having capacitor resonant with transformer leakage inductance Power converters having reduced body diode conduction loss, reduced reverse recovery loss and lower switching noise, among other benefits, have a resonant capacitor Cr connected across an unfiltered output. The resonant capacitor Cr resonates with the leakage induct... | 03/27/2007 |
| 7193868 | Switching power supply circuit A wide-range compatible voltage resonant converter provides high efficiency and allows use of low-breakdown-voltage products for a circuit. The voltage resonant converter is provided with a secondary-side parallel resonant circuit and a secondary-side series resonan... | 03/20/2007 |
| 7190143 | Pulse width modulation (PWM) rectifier with variable switching frequency A method for controlling a device including a plurality of switching devices operated in accordance with a pulse width modulation technique includes receiving a reference voltage signal associated with a first pair of the switching devices. A switching signal is gen... | 03/13/2007 |
| 7180763 | Power converter A power converter comprising a DC/AC bridge circuit electrically coupled between positive and negative DC bus terminals and a set of phase terminals, a DC/DC bridge circuit electrically coupled to the positive and negative DC bus terminals and a set of DC bridge ter... | 02/20/2007 |
| 7176667 | Buck-boost voltage converter An input switching unit selectively couples a first terminal of an inductor with an input voltage and a ground potential. An output switching unit selectively couples a second terminal of the inductor with an output voltage and the ground potential. A first pulse ge... | 02/13/2007 |
| 7177164 | Low power, high voltage power supply with fast rise/fall time A low power, high voltage power supply system includes a high voltage power supply stage and a preregulator for programming the power supply stage so as to produce an output voltage which is a predetermined fraction of a desired voltage level. The power supply stage... | 02/13/2007 |
| 7170261 | Generator with dual cycloconverter for 120/240 VAC operation A generator system has two modes of operation, such as 120 VAC and 240/120 VAC. The generator system has a permanent magnet generator with two independent sets of windings that each generate a three phase AC voltage. One three phase AC voltage is coupled to a first ... | 01/30/2007 |
| 7170761 | Switching power supply circuit A switching power supply circuit includes a primary side series resonant circuit forming a current resonant converter, and a secondary side series resonant circuit formed by at least a secondary winding and a secondary side series resonant capacitor, whereby a coupl... | 01/30/2007 |
| 7148659 | Programmable AC/DC power supply A programmable AC/DC power converter receives a plurality of input voltages and outputs a single voltage from an input voltage system. A transformer receives the single voltage. One of the plurality of input voltages is provided at a center tap of a secondary windin... | 12/12/2006 |
| 7145300 | Multi-axis AC servo control system and method A multiple axis servo control implements a multi-tasking PWM control unit to provide PWM signals for multiple axes in a single unit. A time slice mechanism provides axis selection signals based on a system clock signal to permit control parameters of the selected ax... | 12/05/2006 |
| 7145786 | Point of load sine amplitude converters and methods In a preferred embodiment, a Sine Amplitude Converter (“SAC”) method and apparatus for VTMs converts a DC input voltage to a DC output voltage using a fixed transformation ratio at a frequency locked to a resonance. The SAC uses a resonant circuit including a tr... | 12/05/2006 |
| 7133298 | High frequency voltage regulating transformer based converter A switching regulator and method of fabricating a switching regulator is disclosed. In one embodiment a switching regulator comprises a transformer having a primary winding and a secondary winding, an inductor (L) connected to an input of the primary winding, and a ... | 11/07/2006 |
| 7126831 | DC-AC converter, and method for supplying AC power First and second semiconductor switches which are activated alternately are provided between ends of a primary winding and a common potential point, wherein a DC power supply voltage is supplied to a center tap. An electric current flowing into a load is fed back to... | 10/24/2006 |
| 7106566 | Power adapter interface circuitry for protecting a battery operated system An integrated circuit (IC) has logic and timing circuits that are coupled to discrete circuitry to provide protection and indications whenever an AC adapter that is faulty or has improper voltage levels or polarity are plugged into a system. In particular, the IC de... | 09/12/2006 |
| 7105941 | Framework composition windmill A framework composition windmill includes a cylindrical tower and a wind power dynamic component positioned at the top end of the tower. The wind power dynamic component includes a wind-driven rotor and an STS energy exchange coupling element which includes an annul... | 09/12/2006 |
