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| Number | Title | Issue Date |
| 7994761 | Linear regulator with RF transistors and a bias adjustment circuit A regulator comprising a linear regulator. The linear regulator may comprise a preamplifier, a first radio frequency (RF) transistor and a second radio frequency (RF) transistor. An output of the preamplifier stage may be provided to a biasing terminal of the first ... | 08/09/2011 |
| 7923976 | Fault protection circuit, method of operating a fault protection circuit and a voltage regulator employing the same Embodiments of the present disclosure provide a fault protection circuit, a method of operating a fault protection circuit and a voltage regulator. In one embodiment, the fault protection circuit is for use with the voltage regulator and includes an output power sec... | 04/12/2011 |
| 7884587 | Power supply device and image forming apparatus A charging unit charges a capacitor that is configured to be charged and discharged to drive a load. A switching unit switches on and off between the capacitor and the charging unit. A delay control unit delays an output of a switching control signal for controlling... | 02/08/2011 |
| 7772813 | Power supply circuit An operational amplifier generates a power supply potential from a reference potential. An impedance adjuster adjusts an output impedance of the operational amplifier in accordance with a control signal. A charge accumulator accumulates an output charge of the opera... | 08/10/2010 |
| 7746046 | Power management unit for use in portable applications A voltage regulator includes a first stage capable of receiving a reference voltage and capable of having a first current flowing through the first stage. A second stage is capable of having a second current flowing through the second stage. A third stage is capable... | 06/29/2010 |
| 7728566 | Voltage regulator A voltage regulator having a MOS transistor driver includes a p-channel MOS transistor at a voltage input terminal Vin and a p-channel MOS transistor at a voltage output terminal Vout. A drain of the input side p-channel MOS transistor is connected to the voltage in... | 06/01/2010 |
| 7518347 | Regulator circuit A regulator circuit is provided which has a reference voltage outputting unit, a first operational amplifier, a voltage-dividing unit, and a second operational amplifier. The reference voltage outputting unit is connected to a power source voltage, has a rectifying ... | 04/14/2009 |
| 7482790 | Voltage regulator output stage with low voltage MOS devices Circuits and methods to provide an LDO output stage implemented with low-voltage devices and still allowing higher voltage levels have been achieved. The output stage has been built using two low voltage MOS devices in series. During the time the regulator is in act... | 01/27/2009 |
| 7477044 | Voltage regulator output stage with low voltage MOS devices Circuits and methods to provide an LDO output stage implemented with low-voltage devices and still allowing higher voltage levels have been achieved. The output stage has been built using two low voltage MOS devices in series. During the time the regulator is in act... | 01/13/2009 |
| 7477043 | Voltage regulator output stage with low voltage MOS devices Circuits and methods to provide an LDO output stage implemented with low-voltage devices and still allowing higher voltage levels have been achieved. The output stage has been built using two low voltage MOS devices in series. During the time the regulator is in act... | 01/13/2009 |
| 7402985 | Dual path linear voltage regulator A voltage regulator comprising two feedback loops for regulating a load voltage, where the first feedback loop comprises a pass transistor to source current to the load, and the second feedback loop comprises a shunt transistor to shunt current from the pass transis... | 07/22/2008 |
| 7340035 | X-ray tube cathode overvoltage transient supression apparatus An imaging tube (30) includes multiple high voltage elements (64). A voltage-clamping device (70) is coupled between the high voltage elements (64) and prevents the occurrence of overvoltage transients in the minor insulation of an imagin... | 03/04/2008 |
| 7339770 | Electrostatic discharge protection circuit having a ring oscillator timer circuit An electrostatic discharge protection circuit is provided having a first electrically conductive element (such as a current sinking transistor) to couple between a power source and a first node. The first electrically conductive element has a control input terminal.... | 03/04/2008 |
| 7336459 | Electrostatic discharge protection device and circuit thereof An electrostatic discharge (ESD) protection circuit including a detection circuit for detecting the ESD current and a clamp circuit for bypassing an ESD current between a first pad and a second pad is provided. The detection circuit is connected between the first pa... | 02/26/2008 |
| 7282895 | Active dropout optimization for current mode LDOs A DC/DC converter has a linear voltage regulator for reducing or eliminating the output ripple of the converter with a minimum loss of efficiency. The converter comprises a converter stage with a supply voltage input, a converted voltage output and a control input, ... | 10/16/2007 |
| 7262585 | Method and apparatus for bi-directional current limit in a dual-power source capable device A power supply system having a transistor, a linear regulator, a DC-DC converter, and a control circuit. The transistor has an input, a substrate, a first node, and a second node. The first node is operably coupled to a non-battery power source. A linear regulator i... | 08/28/2007 |
| 7259707 | Semiconductor device with A/D converter A semiconductor device includes a reference voltage generating section configured to generate a first reference voltage and a second reference voltage based on a voltage supplied from an external power supply, and an AD (analog/digital) conversion circuit operating ... | 08/21/2007 |
| 7239181 | Semiconductor device A semiconductor device includes insulated and separated transistor elements successively connected to one another between ground potential and a predetermined potential. A transistor element at the GND potential side is a first stage and a transistor element at the ... | 07/03/2007 |
| 7215103 | Power conservation by reducing quiescent current in low power and standby modes A method and circuit for automatically lowering a quiescent current at a predetermined threshold. A compact and low power current comparator is employed to detect the power consumption conditions, and issues a control signal to lower current consumption within a pow... | 05/08/2007 |
| 7199567 | Voltage regulator output stage with low voltage MOS devices Circuits and methods to provide an LDO output stage implemented with low-voltage devices and still allowing higher voltage levels have been achieved. The output stage has been built using two low voltage MOS devices in series. During the time the regulator is in act... | 04/03/2007 |
| 7196501 | Linear regulator A linear regulator having an input node receiving an unregulated voltage, an output node providing a regulated voltage, a voltage regulator, a bias circuit, and a current control device. The voltage regulator has an input terminal, a reference terminal, and an outpu... | 03/27/2007 |
| 7166991 | Adaptive biasing concept for current mode voltage regulators Circuits and methods to achieve dynamic biasing for the complete loop transfer function of a current mode voltage regulator have been achieved. The circuit comprises a Mirror-Transconductor Amplifier type operational transconductance amplifier (OTA) wherein its tran... | 01/23/2007 |
| 7109761 | Comparator circuit A reference voltage and an input signal voltage are applied to gates of FETs each equipped with a LOCOS-drain structure, respectively, and currents according to the voltages are made to flow from a power supply voltage Vbat to drain sides through resistors and sourc... | 09/19/2006 |
| 7096372 | Storage control device having two I/O control units each having two or more AC/DC power supply devices supplied by least three AC power supplies A storage control device comprises: a first I/O control unit for controlling read/write of data from/to one or more HDDs (Hard Disk Drives); a second I/O control unit whose current consumption is approximately equal to that of the first I/O control unit; two or more... | 08/22/2006 |
| 7092227 | Electrostatic discharge protection circuit with active device An electrostatic discharge protection circuit includes a first terminal, a second terminal, an electrostatic discharge device coupled between the first and second terminals, and an active device coupled to the electrostatic discharge device and controlling an electr... | 08/15/2006 |
| 7079369 | Active power/ground ESD trigger An ESD protective triggering circuit for a triggering circuit for a solid state ESD protective device. The arrangement is to provide a controlled current to the protective device that triggers the device so that the device snaps-back and additionally the triggering ... | 07/18/2006 |
| 7068018 | Voltage regulator with phase compensation The present invention provides a voltage regulator which has high-speed responsibility with a low consumption current, and which can stably operate with a low output capacity. The voltage regulator includes: a reference voltage circuit, a voltage division circuit, a... | 06/27/2006 |
| 7038333 | Hybrid power supply A hybrid power supply includes a switching type DC/DC boost type converter that receives energy from a primary battery cell and is arranged to deliver the energy to a rechargeable cell, set to provide a fixed output voltage that is less than the full charge voltage ... | 05/02/2006 |
| 7026800 | Feed-forward method for improving a transient response for a DC—DC power conversion and DC—DC voltage converter utilizing the same In a method for a DC-DC power conversion performed by a switching mode buck voltage converter, the power conversion is split into two or more stages, and a feed-forward signal is generated by one of the stages and sent to another stage prior thereto. The feed-forwar... | 04/11/2006 |
| 6967470 | Voltage regulator combining a series type regulator with a shunt type regulator having a constant current source A voltage regulator includes a constant current circuit which is connected between an input node with which a power supply voltage is supplied and an output node to which a load is connected and which supplies constant current to the output node. The voltage regulat... | 11/22/2005 |
| 6967559 | Transformer for high-voltage X-ray generator A power supply for a device which has a load, comprising a first resonant generator and a second resonant generator, coupled in parallel, each generator having a phase output. The power supply further comprises a control circuit coupled to the first and second gener... | 11/22/2005 |
| 6961251 | Waveform independent high frequency power system Method and apparatus are disclosed for providing a constant voltage, high frequency sinusoidal output across a varying load, using either a single or multiple switch topology operating at constant frequency while maintaining high efficiency over the entire load rang... | 11/01/2005 |
| 6943640 | Current source modulator A current source modulator (202; 302, 502) provides power to radar transmitters. The modulator comprises a power supply (210, 310, 510) providing, when enabled, a known current to a storage capacitor (145). A comparator circuit (220) prov... | 09/13/2005 |
| 6919811 | Charger detection and enable circuit A detection circuit is configured to detect the presence of a power source by comparing two input voltages (VIN1, VIN2). An example detection circuit is arranged, such that the first input voltage (VIN1) may operate above the process limit for t... | 07/19/2005 |
| 6876180 | Power supply circuit having a start up circuit A reference voltage circuit and an operational amplifier operate when an output voltage is produced from an output terminal of a power supply circuit. When the output voltage is low in the rising phase of a power source voltage, a transistor Q17 in a startup ... | 04/05/2005 |
| 6756752 | Circuit arrangement for controlling a load A circuit for controlling the electric power to be supplied from a direct-current source to a load, particularly to a fan or heater in a motor vehicle. The circuit has a first field-effect transistor, to be connected in series with the load to be controlled, and a c... | 06/29/2004 |
| 6713974 | Lamp transformer for use with an electronic dimmer and method for use thereof for reducing acoustic noise A controller for reducing acoustic noise produced during use of a leading edge dimmer, includes a leading edge controller responsive to an input voltage fed thereto for producing a control signal upon detection of a leading edge, and a linear switch coupled to the l... | 03/30/2004 |
| 6707280 | Bidirectional voltage regulator sourcing and sinking current for line termination A voltage regulator for providing a bidirectional current and a regulated voltage to a load. The voltage regulator regulates the output voltage at one half the level of the input voltage using a voltage doubler circuit in reverse. The regulator provides current to t... | 03/16/2004 |
| 6703813 | Low drop-out voltage regulator An LDO regulator is arranged to provide regulation with a pass device, a cascode device, a level shifter, an error amplifier, and a tracking voltage divider. The error amplifier is arranged to sense the output voltage and provide an error signal to the pa... | 03/09/2004 |
| 6696822 | Voltage regulator with a constant current circuit and additional current sourcing/sinking A voltage regulator includes a constant current circuit which is connected between an input node with which a power supply voltage is supplied and an output node to which a load is connected and which supplies constant current to the output node. The volt... | 02/24/2004 |
