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76 results about "Variable-voltage power supply" patented technology
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Battery powered device with dynamic power and performance management
A computing device operates over a range of voltages and frequencies and over a range of processor usage levels. The computing device includes at least a variable frequency generator, a variable voltage power supply and voltage supply level and clocking frequency management circuitry. The variable frequency generator is coupled to the processor and delivers a clock signal to the processor. The variable voltage power supply is coupled to the processor and delivers voltage to the processor. The voltage supply level and clocking frequency management circuitry adjust both the voltage provided by the variable voltage power supply and the frequency of the signal provided by the variable frequency generator. The computing device includes a temperature sensor that provides signals indicative of the temperature of the processor and the voltage supply level and clocking frequency management circuitry adjusts the voltage and / or the clocking frequency provided by the variable voltage power supply. The computing device may also include a fan controlled by the voltage supply level and clocking frequency management circuitry, the fan adjusting the temperature of the processor when activated. In cold weather applications, the computing device may further include a heater controlled by the voltage supply level and clocking frequency management circuitry that raises the temperature of the processor when activated.
Owner:AVAGO TECH INT SALES PTE LTD
High efficiency variable voltage supply
InactiveUS20070210771A1Minimising peak amplitudeMinimising slew rateHigh frequency amplifiersAmplifier modifications to raise efficiencyEngineeringVariable-voltage power supply
There is disclosed a power supply stage (202), comprising: generating means for generating a power supply voltage from a high efficiency variable voltage supply (204) in dependence on a reference signal; adjusting means for receiving the generated power supply voltage (220), and adapted to provide an adjusted selected power supply voltage tracking the reference signal (216) in dependence thereon.
Owner:SNAPTRACK
Battery powered device with dynamic power and performance management
Owner:AVAGO TECH INT SALES PTE LTD
Powder spray coating discharge assembly
InactiveUS20090229517A1Reduce discharge currentImprove conductivityLiquid spraying plantsLiquid surface applicatorsSpray coatingElectrical connection
A powder spray coating discharge assembly (230, 260, 216, 228, 232) for connection to an electrostatic spray coating gun (210), the gun (210) having a gun body (212), means for connecting to a supply of coating powder and means for supplying a voltage (20) at first and second potentials respectively to first (292) and second electrical connections (294) each for connection to a respective one of a discharge electrode (232) and a counter electrode (260), the means for supplying the voltage (20) comprising: a variable voltage power supply (114) having an input connected to an electrical power source (110), an output connected to each of the first and second electrical connections (292, 294), a control circuit (128) for controlling the variable voltage power supply (20) and means (120) for sensing an output load, wherein the control circuit (128) is adapted to adjust the variable voltage power supply (20) to reduce the voltage and current in proportion to a sensed increase in load, or vice-versa.
Owner:YU TUNG INVESTMENT HLDG
Apparatus for measurement of in-situ viscosity
An apparatus for measuring in situ the viscosity of a fluid within a vessel which includes an impeller paddle immersed in the fluid rotated by an electric motor connected to a shaft passing through a wall of the vessel. The impeller paddle is connected to the shaft by a toroidal spring. The electric motor is controlled by a variable voltage power supply controlled by a computer. Sensors are mounted on the impeller paddle and the shaft to sense the rotational positions of each and to generate electronic signals indicative thereof. The electronic signals are processed by signal processing circuitry to determining the deflection angle of the impeller paddle and the results sent to a computer, where the signals are recorded and analyzed to determine the viscosity of the fluid.
Owner:EI DU PONT DE NEMOURS & CO
Amplifier circuit
ActiveUS20100219888A1Amplifier modifications to reduce noise influenceAmplifier modifications to reduce temperature/voltage variationAudio power amplifierVariable-voltage power supply
An amplifier circuit comprises an input, for receiving an input signal to be amplified; a preamplifier, for amplifying the input signal based on a variable gain; a power amplifier for amplifying the signal output from the preamplifier, and a variable voltage power supply for supplying one or more supply voltages to the power amplifier. The supply voltages are adjusted based on the variable gain or the input digital signal. According to other aspects of the invention, a power supply of an amplifier circuit is clocked using a clock signal, whereby the clock signal has a frequency that varies in accordance with a volume signal or an input signal.
Owner:CIRRUS LOGIC INC
Selectable ion concentrations with electrolytic ion exchange
ActiveCN1863737AWater treatment parameter controlIon-exchange column/bed processesElectrolysisIon-exchange membranes
An apparatus (20) treats an influent solution (70) comprising ions to obtain a selectable ion concentration in an effluent solution (80). The apparatus (20) comprises an electrochemical cell (22) comprising a housing (25) comprising first and second electrodes (40, 45). A water-splitting ion exchange membrane (100) is between the first and second electrodes (40, 45), the membrane (100)comprising an anion exchange surface (46) facing the first electrode (40), and an cation exchange surface (48) facing the second electrode (45), or vice versa. The housing (25) also has an influent solution inlet (30) and an effluent solution outlet (35) with a solution channel (52) that allows influent solution (70) to flow past both the anion and cation exchange surfaces (46, 48) of the water-splitting ion exchange membrane (100) to form the effluent solution (80). A variable voltage supply (50) is capable of maintaining the first and second electrodes (40, 45) at a plurality of different voltages during an ion exchange stage.
Owner:POS TECH INC
Volume adjustment device, digital amplifier, and digital signal reproducing device
InactiveUS20050122162A1Reduce power consumptionDeterioration of audio performanceSupply voltage varying controlAmplification control detailsDriver circuitAudio power amplifier
A digital amplifier causes a gate drive circuit to drive output transistors, and switches a power source voltage supplied from a variable voltage power source, thereby amplifying an amplitude of a 1-bit digital signal outputted from a ΔΣ block. A variable voltage power source varies a driving voltage, by which an upper gate drive circuit drives output transistors, as a voltage obtained by adding (i) a constant voltage supplied to a lower gate drive circuit to (ii) a power source voltage, so as to correspond to the power source voltage. Thus, the driving voltage is minimized without influencing a switching operation of the output transistors. As a result, it is possible to reduce power consumption of the upper gate drive circuit in turning down the volume.
Owner:SHARP KK
Volume adjustment device, digital amplifier, and digital signal reproducing device
InactiveUS7049885B2Reduce power consumptionMinimize driving voltageSupply voltage varying controlAmplification control detailsDriver circuitAudio power amplifier
A digital amplifier causes a gate drive circuit to drive output transistors, and switches a power source voltage supplied from a variable voltage power source, thereby amplifying an amplitude of a 1-bit digital signal outputted from a ΔΣ block. A variable voltage power source varies a driving voltage, by which an upper gate drive circuit drives output transistors, as a voltage obtained by adding (i) a constant voltage supplied to a lower gate drive circuit to (ii) a power source voltage, so as to correspond to the power source voltage. Thus, the driving voltage is minimized without influencing a switching operation of the output transistors. As a result, it is possible to reduce power consumption of the upper gate drive circuit in turning down the volume.
Owner:SHARP KK
xDSL multistandard driver circuit
ActiveUS20060034359A1Different setModulated-carrier systemsAmplifier with semiconductor-devices/discharge-tubesDriver circuitAudio power amplifier
An electric circuit for amplifying an xDSL signal comprises an operational amplifier and a signal monitoring circuit. The operational amplifier is configured to amplify the xDSL signal, is powered by a variable voltage supply and has a gain which is adjustable by an operating mode control signal. The signal monitoring circuit is activated by the operating mode control signal and is configured, when activated by the operating mode control signal, to generate a control signal to adjust the voltage of the variable voltage supply in order to adjust the maximal signal swing of the output signal of said operational amplifier. The control signal is generated by comparing the amplitude of the xDSL signal applied to the electric circuit with an amplitude threshold value.
Owner:MAXLINEAR INC
Gate-boosted, variable voltage supply rail amplifier
ActiveUS8008975B1Amplifier detailsAmplifiers with semiconductor devices onlyElectronic systemsAudio power amplifier
In at least one embodiment, an electronic system includes an amplifier having an on-chip charge pump to provide a gate boost voltage to boost a gate voltage of at least one on-chip field effect transistor (FET) of an output stage of an amplifier. In at least one embodiment, the gate boost voltage boosts the gate voltage higher than the supply voltage rail to increase an overdrive voltage of the on-chip FET. In at least one embodiment, the gate boost voltage boosts the DC bias of an input signal and, thus, generation of gate boost voltage by the on-chip charge pump is signal-independent, i.e. independent of the input signal. Increasing the overdrive voltage increases the efficiency of the amplifier by decreasing the difference between the maximum swing of the output voltage and the voltage supply rails of the at least one on-chip FET relative to conventional designs.
Owner:CIRRUS LOGIC INC
Dynamic Voltage Scaling for Packet-Based Data Communication Systems
ActiveUS20080297133A1Magnetic measurementsFrequency-division multiplex detailsCommunications systemIndependent function
A dynamic voltage scaling system for a packet-based data communication transceiver includes a constant voltage supply, a variable voltage supply, and a voltage control unit. The constant voltage supply is configured to supply a constant voltage to at least one parameter-independent function of the transceiver, and the variable voltage supply is configured to supply a variable voltage in accordance with a control signal to at least one parameter-dependent function of the transceiver. Parameter-independent transceiver functions perform operations independent of a predetermined parameter and parameter-dependent transceiver functions perform operations dependent on the predetermined parameter The voltage control unit is configured to generate the control signal based on information provided by at least one parameter-independent transceiver function about the predetermined parameter.
Owner:RENESAS ELECTRONICS CORP
Electric curtain
InactiveCN101999835AGuaranteed uptimeGood self-lubricationCurtain suspension devicesCurtain rodsEngineering plasticEngineering
The invention discloses an electric curtain, wherein the mounting frame of the electric curtain is a box body; a transverse diaphragm plate is used to divide the box body into an upper part and a lower part; a vertical diaphragm plate is used to divide the upper part into a mounting chamber and a wiring chamber; the lower part of the box body is provided with a chute; the entire drive device is arranged in the sealed mounting chamber of the upper part of the box body, the drive device consists of a guide way, guiders, a gear motor and a variable voltage power supply; the guide way is driven by the gear motor to rotate and drive the two guiders to perform reverse movement or relative movement along the guide way; the bottom surface of each guider is provided with a permanent magnet; two pulleys are arranged in the chute of the lower part of the box body; a magnet is embedded in the top surface of each pulley; the magnet and the permanent magnet at the bottom of each guider are opposite and attract to each other; the guiders move left and right on the guide way and attract the pulleys to slide left and right in the chute; the guide way and the guiders are made from engineering plastic; and the threads on the guide way are multi-start trapezoidal threads. The electric curtain has low running noise, small volume and convenient mounting method; the curtain can move to an assigned position for opening or closing; and the electric curtain is safe to use.
Owner:王宇
Oscillator circuit for EEPROM high voltage generator
A semiconductor oscillator circuit for an EEPROM high voltage charge pump utilizes a current generating means to charge a first and a second capacitor alternatively. The charging current produced by the current generating means is inversely proportional to the ambient temperature. The charging current is proportional to the supply voltage and consequently, the oscillator frequency output remains constant over a variable voltage supply. Such a constant frequency characteristic makes a low voltage operation possible, but slows down the oscillator frequency as temperature increases. The slowing of oscillator frequency limits the charge pump output voltage and enhances the lifespan of the EEPROM cells.
Owner:ATMEL CORP
Massage device utilizing an unanchored magnet for primary force generation
A therapeutic system for massage comprises a massage device having an activation cell comprising a hollow pocket at least partially filled with a ferro-magnetic fluid, a permanent magnet suspended in the ferro-magnetic fluid, a coil of electrically-conductive material in proximity to the pocket, and a connection interface to connect the coil to a source of varying voltage and current, and a power source of varying voltage for connecting to the connection interface to drive the activation cell.
Owner:SOUNDSTARTS
Low power scheduling for multimedia systems
InactiveUS7043557B2Minimize energy consumptionBuffer capacity is not exceededPicture reproducers using cathode ray tubesPicture reproducers with optical-mechanical scanningComputer hardwareClient-side
A method and system thereof for reducing the energy consumed when decoding an encoded and synchronized multimedia data stream, wherein the data stream is non-preemptable and subject to precedence constraints. In a client-server environment, the server delivers to the client the stream for decoding. The client has a processor operating on a discrete variable-voltage power supply. Prior to transmitting the stream to the client, the server produces an execution schedule according to the precedence constraints. The server also assigns a voltage setting for each task in the schedule, wherein each task decodes a frame in the stream without preemption. The server transmits the execution schedule and voltage settings to the client with the encoded data stream. The schedule and voltage settings reduce energy consumption by the client while satisfying multimedia timing constraints.
Owner:HEWLETT PACKARD DEV CO LP
xDSL multistandard driver circuit
ActiveUS7649948B2Different setModulated-carrier systemsAmplifier with semiconductor-devices/discharge-tubesDriver circuitAudio power amplifier
An electric circuit for amplifying an xDSL signal comprises an operational amplifier and a signal monitoring circuit. The operational amplifier is configured to amplify the xDSL signal, is powered by a variable voltage supply and has a gain which is adjustable by an operating mode control signal. The signal monitoring circuit is activated by the operating mode control signal and is configured, when activated by the operating mode control signal, to generate a control signal to adjust the voltage of the variable voltage supply in order to adjust the maximal signal swing of the output signal of said operational amplifier. The control signal is generated by comparing the amplitude of the xDSL signal applied to the electric circuit with an amplitude threshold value.
Owner:MAXLINEAR INC
Transconductor circuit for compensating the distortion of output current
InactiveUS7038501B2Amplifier modifications to reduce non-linear distortionModulation transference balanced arrangementsEngineeringAuxiliary circuit
Owner:ELECTRONICS & TELECOMM RES INST
Adjustable frequency-stabilizing voltage-stabilizing variable-frequency variable-voltage power supply
InactiveCN1845439AInput and output voltage continuously adjustableGood variable frequency and voltage characteristicsConversion with intermediate conversion to dcElectric variable regulationLoad circuitControl signal
The disclosed tunable stable-frequency / voltage frequency / voltage-changing power comprises: a three-phase transformer rectification filter circuit, a reversing-switch signal generation / amplification circuit, an auxiliary power circuit, an independent power circuit, a triode voltage-regulation circuit, a reversing-switch power circuit, a transformer load circuit, a load voltage sampling circuit, a load environmental change voltage sampling circuit, a sample signal amplification / control circuit, and a initiation-control signal generation circuit for power protection. This product has well performance.
Owner:章祖文
Constant Current Type Power Supplies
InactiveUS20080123706A1Maintain standardReduce frequency dependent impedanceBatteries circuit arrangementsSemiconductor laser arrangementsCapacitanceEngineering
Constant current power supply arrangements can charge a capacitor with a constant current and are suitable as power supplies for laser diodes. A power supply for a laser diode comprises: a variable voltage power supply, a load path for carrying a laser diode, a shunt path connected in parallel with the load path, a current draining element for switching the shunt path, the current draining element being associated via a first feedback element with the variable voltage power supply such that current drained by the current draining element provides first feedback control of a voltage level of the variable voltage power supply, and a voltage operated second feedback element associated with both the load path and the shunt path to provide second feedback control of the current draining element to drain current via the current draining element in response to current changes at the load. A circuit arrangement for charging a capacitance comprises a load capacitance to be charged, a serially connected inductive component contributing to a serial frequency dependent impedance, and a variable frequency source for supplying charging current at a variable frequency, the variable frequency source being controllable to reduce frequency during charging of the capacitor, thereby to reduce the frequency dependent impedance and maintain a constant level of charging current to the load capacitance.
Owner:EL OP ELECTRO OPTICS INDS
Dynamic voltage scaling for packet-based data communication systems
ActiveUS8238868B2Magnetic measurementsFrequency-division multiplex detailsTransceiverIndependent function
A dynamic voltage scaling system for a packet-based data communication transceiver includes a constant voltage supply, a variable voltage supply, and a voltage control unit. The constant voltage supply is configured to supply a constant voltage to at least one parameter-independent function of the transceiver, and the variable voltage supply is configured to supply a variable voltage in accordance with a control signal to at least one parameter-dependent function of the transceiver. Parameter-independent transceiver functions perform operations independent of a predetermined parameter and parameter-dependent transceiver functions perform operations dependent on the predetermined parameter The voltage control unit is configured to generate the control signal based on information provided by at least one parameter-independent transceiver function about the predetermined parameter.
Owner:RENESAS ELECTRONICS CORP
Variable voltage supply bias and methods for negative differential resistance (NDR) based memory device
InactiveUS20060028881A1Improve featuresEasy to storeDigital storageStatic random-access memoryIntensity control
Static random access memory (SRAM) performance is enhanced through the use of appropriate latch strength control. For example, latch strength in an SRAM cell is increased during data store operations to reduce power dissipation and improve reliability. Latch strength can also be increased to improve read speed, while latch strength can be reduced to improve write speed. In an SRAM cell including at least a negative differential resistance (NDR) device as a pull-up element, this type of latch control can be achieved through appropriate biasing of the NDR device(s). For example, drain-to-source bias can be increased or decreased to increase or decrease, respectively, latch strength. Similarly, gate-to-source bias can be increased or decreased to increase or decrease, respectively, latch strength.
Owner:SYNOPSYS INC
Storage-type water heater having tank condition monitoring features
Methods and systems for evaluating the condition of a water tank having a powered anode protection system. The water heater includes a storage tank to hold water, a powered anode, and a control circuit. The control circuit includes a variable voltage supply, a voltage sensor, and a current sensor. The control circuit is configured to compare a measured parameter to a threshold. In some constructions, the threshold is indicative of a condition of the storage tank at which the powered anode is no longer able to protect the storage tank from corrosion. In other constructions, the threshold is predicative of a potential failure of the storage tank caused by corrosion. In some constructions, the control circuit is configured to estimate a time remaining until the predicted failure of the storage tank.
Owner:AOS HLDG CO
Intelligent reverse power control system and control method for variable-frequency variable-voltage power supply
ActiveCN105978040AReverse power avoidanceLow costSingle network parallel feeding arrangementsVoltage amplitudePower control system
The invention provides an intelligent reverse power control system and control method for a variable-frequency variable-voltage power supply. The control system comprises an output power calculation unit, a frequency regulating amount calculation unit, a voltage frequency calculation unit, a voltage phase calculation unit, a voltage amplitude value calculation unit and a power module control unit, wherein the output power calculation unit is used for calculating the output power; the frequency regulating amount calculation unit is used for calculating the frequency regulating amount; the voltage frequency calculation unit is used for calculating the three-phase voltage output frequency; the voltage phase calculation unit is used for obtaining the three-phase voltage output phase; the voltage amplitude value calculation unit is used for calculating the output voltage amplitude value; and the power module control unit is used for controlling each power module of the variable-frequency variable-voltage power supply. According to the intelligent reverse power control system and control method, the frequency, the phase and the amplitude value of the output voltage are controlled, so that the generation of reverse power when a shore power supply and a ship power distribution system are in electric switch can be avoided consequently.
Owner:SUZHOU INOVANCE CONTROL TECH CO LTD
Variable voltage supply bias and methods for negative differential resistance (NDR) based memory device
InactiveUS7095659B2Improve featuresEasy to storeDigital storageStatic random-access memoryUltimate tensile strength
Static random access memory (SRAM) performance is enhanced through the use of appropriate latch strength control. For example, latch strength in an SRAM cell is increased during data store operations to reduce power dissipation and improve reliability. Latch strength can also be increased to improve read speed, while latch strength can be reduced to improve write speed. In an SRAM cell including at least a negative differential resistance (NDR) device as a pull-up element, this type of latch control can be achieved through appropriate biasing of the NDR device(s). For example, drain-to-source bias can be increased or decreased to increase or decrease, respectively, latch strength. Similarly, gate-to-source bias can be increased or decreased to increase or decrease, respectively, latch strength.
Owner:SYNOPSYS INC
Powder spray coating discharge assembly
InactiveUS8166912B2Orange peelFully chargedLiquid spraying plantsLiquid surface applicatorsSpray coatingElectrical connection
A powder spray coating discharge assembly (230, 260, 216, 228, 232) for connection to an electrostatic spray coating gun (210), the gun (210) having a gun body (212), means for connecting to a supply of coating powder and means for supplying a voltage (20) at first and second potentials respectively to first (292) and second electrical connections (294) each for connection to a respective one of a discharge electrode (232) and a counter electrode (260), the means for supplying the voltage (20) comprising: a variable voltage power supply (114) having an input connected to an electrical power source (110), an output connected to each of the first and second electrical connections (292, 294), a control circuit (128) for controlling the variable voltage power supply (20) and means (120) for sensing an output load, wherein the control circuit (128) is adapted to adjust the variable voltage power supply (20) to reduce the voltage and current in proportion to a sensed increase in load, or vice-versa.
Owner:YU TUNG INVESTMENT HLDG
Water storage device having a powered anode
Owner:AOS HLDG CO
Water storage device having a powered anode
A water heater having energized electrodes and a method of controlling the water heater. The water heater includes a tank for storing water, a heating element, electrodes and a control circuit. The control circuit includes a variable voltage power supply, voltage sensor, and current sensor. the control circuit is configured to controllably apply a voltage to the electrode, utilize the voltage sensor to determine a potential of the electrode relative to the box when the voltage is not energizing the electrode, and determine a current to be applied to the box after the voltage is energized to the electrode, The conductivity state of the water in the tank is determined based on the electrode potential and current, and the voltage applied to the energized electrodes is defined based on the conductivity state. The water heater control circuit can also determine whether the water heater is dry burning.
Owner:AOS HLDG CO
Ripple count circuit including varying ripple threshold detection
ActiveUS20200343842A1DC motor speed/torque controlCounting chain asynchronous pulse countersDriving currentDC - Direct current
A motor control system includes a variable voltage supply in signal communication with a direct current (DC) motor. The DC motor includes a rotor induced to rotate in response to a drive current generated by a variable supply voltage delivered by the voltage supply. The rotation of the rotor (103) generates a mechanical force that drives a component. A ripple count circuit (104) is configured to filter the drive current based on a rotational speed (ω) of the rotor (103) to generate a filtered drive current signal, and to generate a varying threshold based on the filtered drive current signal. Based on a comparison between the filtered drive current signal and the varying threshold, the ripple count circuit (104) generates a pulsed output signal indicative of the rotational speed (ω) of the rotor and a rotational position (θ) of the rotor.
Owner:INTEVA FRANCE
Multimode starting system of fuel cell power supply
ActiveCN102097638AImprove applicabilityEasy to operateBatteries circuit arrangementsFuel cell auxillariesFuel cellsLow voltage
The invention relates to a multimode starting system of a fuel cell power supply, comprising a controller connected by a line, a starting storage battery, a charger, an electrifying switch K1, a two-way relay K2, a variable voltage power supply, a diode D1, an external starting high voltage interface, an external starting low voltage interface and an external charging interface. By applying the system, multimode charging on the starting storage battery in the fuel cell power supply can be realized, and another storage battery starting system can be externally connected under the condition that the electric quantity of the starting storage battery is not enough to start the fuel cell power system. The system in the invention has the characteristics of low implementation cost, simple structure, and high safety and reliability, and is easy to operate.
Owner:SUNRISE POWER CO LTD
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