Celebrity Inventors
Mark Twain (Samuel L. Clemens) received Patent No. 121,992 for "An Improvement in Adjustable and Detachable Straps for Garments." He later received two more patents: one for a self-pasting scrapbook and one for a game to help players remember important historical dates.
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| Number | Title | Issue Date |
| 8116052 | Power supply control circuit including overvoltage protection circuit A protection ability of a power supply control circuit is improved so as to protect an output transistor against a back electromotive voltage from a load, a dump surge voltage, and a positive spike surge voltage which has a smaller energy but is higher than the dump... | 02/14/2012 |
| 7995318 | High frequency power converter Power at a selected frequency in the high frequency region of the spectrum is supplied by a power converter having a wide range of input voltages. The power converter uses a source oscillator and a NOR gate. The source oscillator generates a rectangular wave at the ... | 08/09/2011 |
| 7738226 | Integrated snubber device on a semiconductor basis for switching load reduction, voltage limitation and/or oscillation attenuation Integrated snubber device on a semiconductor basis for wiring an electric network for absorbing electric energy from an electric energy store, of an electric network, including at least two terminals for being connected to the electric network to be wired, an electr... | 06/15/2010 |
| 7525781 | Snubber circuit A snubber circuit for use with an integrated power supply control circuit incorporating a transformer and a lateral power MOSFET on a single silicon chip. A capacitor is provided in circuit with the MOSFET and first resistor and diode are in series with each other a... | 04/28/2009 |
| 7388765 | Method and arrangement in connection with a half-controlled network bridge A method and an arrangement for controlling phase-specific thyristors of a half-controlled network bridge, the method comprising identifying a thyristor to be controlled on the basis of the magnitude of phase voltage, controlling the thyristor by switching on a volt... | 06/17/2008 |
| 7385833 | Snubber circuit for a power converter A snubber circuit and corresponding power converter topology for controlling the voltage across the resonant capacitor at turn on of a control switch so as to suppress a spike at the switch caused by the large current pulse and parasitic inductance of the power conv... | 06/10/2008 |
| 7369378 | Electric motor driving apparatus A surge protective circuit and a noise filter circuit are provided in a power-supplying line, the surge protective circuit is adapted for protecting a switching device from surge voltage generated during operation of an electric motor and the noise filter circuit is... | 05/06/2008 |
| 7336512 | Power convertor with low loss switching A welding power supply includes an input rectifier that receives sinusoidal or alternating line voltage and provides a rectified voltage. A pre-regulator provides a dc bus and a convertor, such as a boost convertor, provides a welding output. The pre-regulator is an... | 02/26/2008 |
| 7190564 | Snubber circuit A snubber circuit for use with an integrated power supply control circuit incorporating a transformer and a lateral power MOSFET on a single silicon chip. A capacitor is provided in circuit with the MOSFET and first resistor and diode are in series with each other a... | 03/13/2007 |
| 7180337 | Method for switching driving of a semiconductor switching element A method of driving a semiconductor switching element includes applying a drive signal configured to switch the semiconductor element such that a change in the charge stored on the drive electrode occurs over time, the drive signal having one or more predetermined p... | 02/20/2007 |
| 7177128 | Snubber module and power conversion device It is an object of the invention to realize a snubber module which is small in size, and which can be easily handled, thereby miniaturizing a power conversion apparatus. In the invention, a snubber module (10) is configured so that twelve snubber diode... | 02/13/2007 |
| 7139157 | System and method for protecting a load from a voltage source A field effect transistor (FET) is used as the protection circuit. The gate is grounded through an electrical element. The voltage source is connected to the drain of the FET. The load is connected to the source of the FET. At low input voltages, the FET conducts in... | 11/21/2006 |
| 7133268 | Current control via a variable voltage snubbing network System and method for controlling current across a load. A preferred embodiment comprises a current varying circuit (such as current varying circuit 525) that can create a sequence of voltage drops in a driver circuit (such as the driver circuit 505) c... | 11/07/2006 |
| 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 |
| 7072162 | Bi-directionally driven forward converter for neutral point clamping in a modified sine wave inverter A bi-directionally driven forward converter for neutral point clamping in a modified sine wave inverter maintains wave shape integrity when the half bridge output is subjected to loads of varying impedances. This bi-directionally driven forward converter is supporte... | 07/04/2006 |
| 7072196 | Multi-stage high voltage solid state switch A method for triggering a high voltage solid state switch comprised of a set of thyristors connected in series. Initiating switch turn-on requires command triggering of only the lowest voltage thyristor, thereby eliminating the need for expensive high voltage pulse ... | 07/04/2006 |
| 7054127 | Methods and apparatus to protect against voltage surges A cable device includes an integrated surge protection circuit. In the event that, communication signals conveyed by the cable include (potentially damaging) transient voltages, the surge protection circuit integrated in the cable suppresses the transient voltages a... | 05/30/2006 |
| 7031129 | Protection circuit A protection circuit, to be provided for a circuit arrangement having an inductive load and an FET as an N-channel MOS transistor provided upstream of the load with respect to a flow of power current, the FET controlling an energization state of the load, the protec... | 04/18/2006 |
| 7009828 | Semiconductor switching device Self-quenching switching elements are connected in series in a semiconductor switching device. Snubber circuits including a diode, a capacitor, and a non-linear circuit are connected in parallel with the respective semiconductor switching elements. In the snubber ci... | 03/07/2006 |
| 6980447 | Active snubber circuit for synchronous rectifier A snubber circuit for use with, for example, a self-driven synchronous rectifier in a power converter is disclosed. The snubber circuit, in various embodiments, captures and recirculates energy from the leakage inductance of the converter in a substantially lossless... | 12/27/2005 |
| 6924687 | Voltage tolerant circuit for protecting an input buffer An invention is disclosed for protecting an input buffer. A current from a p-supply to an input buffer is lowered when an input voltage to the input buffer is tolerant HIGH. The p-supply being a VDD voltage supplied to a p-channel transistor in the input ... | 08/02/2005 |
| 6914788 | Power supply apparatus Capacitors (4, 6) are connected in series across a DC power supply (2). IGBTs (8, 10) are connected in series across the DC power supply (2), too. The IGBTs (8, 10) are rendered conductive alternately. A transformer (12) is ... | 07/05/2005 |
| 6906502 | Method for regulating an output voltage of a power coverter A power converter output voltage regulation method in which sensed output voltages and sensed currents are stored in a memory during a plurality of time intervals. In each time interval the sensed output voltage and the sensed current is compared with the sensed out... | 06/14/2005 |
| 6903911 | Protective circuit for a network-controlled thyristor bridge A protective circuit (SCH) for a line-commutated thyristor bridge (B, B′), which is designed for feeding energy of a power circuit connected to the bridge and also for feedback from this circuit, and which is connected between the thyristor bridge and the power ci... | 06/07/2005 |
| 6813172 | Power supply circuit for video display device A power supply circuit for a video display device including a power transformer for inducing a voltage with respect to an input voltage by using an interaction occurring between a primary coil and a secondary coil; a switching circuit unit for controlling the voltag... | 11/02/2004 |
| 6750563 | Voltage sag and over-voltage compensation device with pulse-width modulated transformer A voltage sag and over-voltage compensation device for an AC electric power distribution system employing cascaded switching devices and a pulse-width modulated transformer. Each stage of the cascaded switching device includes a switching element located within a fu... | 06/15/2004 |
| 6690143 | Power factor correction circuit with resonant snubber A power factor correction (PFC) circuit with a resonant snubber. The power factor correction (PFC) circuit has an input part (601) for receiving an AC voltage and outputting a first DC voltage; a main part (604) for converting the first DC voltage to a se... | 02/10/2004 |
| 6630805 | Actively controlled regenerative snubber for unipolar brushless DC motors An actively controlled regenerative snubber configuration for use in unipolar brushless direct current motors comprises a first inductor, a first switch and a capacitor, all of which are connected in series to a positive voltage supply and in parallel wit... | 10/07/2003 |
| 6621676 | Method and apparatus to oppose a short circuit failure mechanism in a printer drive circuit An apparatus and method of use opposes a short circuit failure mode in a printer having a printhead controller circuit driving an address bus connected to two or more printheads. A failure protection circuit associates one resistor group with each address... | 09/16/2003 |
| 6597227 | System for providing electrostatic discharge protection for high-speed integrated circuits An ESD protection circuit uses an inductor to create an electromagnetic resonance in conjunction with the load capacitance of a conventional ESD device. By properly tuning the resonance of this combination, the protective properties of the ESD device can ... | 07/22/2003 |
| 6594130 | Method and circuit for the protection of a thyristor Circuits and methods for protecting thyristors in a bridge configuration are provided. A circuit comprises a line reactor in series with the input of the bridge and the input of the diametric cell, two leg reactors each in series with a respective leg and... | 07/15/2003 |
| 6593794 | System for providing electrostatic discharge protection for high-speed integrated circuits An ESD protection circuit uses an inductor to create an electromagnetic resonance in conjunction with the load capacitance of a conventional ESD device. By properly tuning the resonance of this combination, the protective properties of the ESD device can ... | 07/15/2003 |
| 6559562 | Voltage sag and over-voltage compensation device with pulse width modulated autotransformer A voltage sag and over-voltage compensation device for an AC electric power distribution system employing cascaded switching devices and a pulse width modulated autotransformer. The autotransformer typically includes lower, center, and upper poles or taps... | 05/06/2003 |
| 6509779 | System for providing electrostatic discharge protection for high-speed integrated circuits An ESD protection circuit uses an inductor to create an electromagnetic resonance in conjunction with the load capacitance of a conventional ESD device. By properly tuning the resonance of this combination, the protective properties of the ESD device can ... | 01/21/2003 |
| 6445561 | Circuit arrangement, in particular for triggering an ignition end stage A circuit arrangement, in particular for triggering an ignition output stage, having a power switching transistor and a switchable freewheeling circuit or an auxiliary channel. The freewheeling circuit or the auxiliary channel may be constituted by a trig... | 09/03/2002 |
| 6434029 | Boost topology having an auxiliary winding on the snubber inductor A boost converter topology is disclosed that includes a resonant network comprising a snubber inductive element having a primary winding connected in series to a first resonant diode that is connected, at a first node, to two series connected additional r... | 08/13/2002 |
| 6396672 | Apparatus and method for utilizing a snubber capacitor to power a silicon-controlled rectifier gate trigger circuit A circuit that includes a silicon-controlled rectifier and a silicon-controlled rectifier gate trigger circuit connected to the silicon-controlled rectifier. A snubber capacitor is connected to the silicon-controlled rectifier and the silicon-controlled r... | 05/28/2002 |
| 5995352 | Ignition apparatus and method The voltage across the spark gap is increased or amplified to ignite the gap when required, thus enabling ignition of the spark gap when required. The incremental voltage to obtain gap ignition is additive to any voltage already across the gap, and is add... | 11/30/1999 |
| 5923513 | Active snubber device for power modules A snubber device for a power switch comprising a sensing device coupled in the output circuit of the power switch, the sensing device having a reference input and providing an output indicating if a transient pulse of a magnitude greater than a preset ran... | 07/13/1999 |
| 5914845 | Surge protector system A surge protector system is provided including multiple surge protector circuits situated within a service panel of a structure. The surge protector circuits are connected between outlets of the structure and one of the surge protection devices of a power... | 06/22/1999 |
