Abstract: To provide a digitally controlled LDO regulator that can control an output voltage even during an auto-zero processing period. A digitally controlled low dropout regulator is provided that includes a plurality of AD converters and an impedance variable circuit, each of the plurality of AD converters including a comparator, in which a first signal from each of the plurality of AD converters is input to the impedance variable circuit; a second signal output from the impedance variable circuit is input to one of two terminals of each of the plurality of AD converters; when one of the plurality of AD converters is in operation, another of the plurality of AD converters performs auto-zero processing to set a voltage value used as a reference; and the comparator compares a voltage value of the second signal input to the one of the two terminals with the set voltage value.

Abstract: Systems, devices and methods are described herein. A device includes a power stage circuit, a switch and a first circuit. The switch is electrically coupled to the power stage circuit. The first circuit is electrically coupled to the power stage circuit and the switch and has a single output. The first circuit is configured to provide a first circuit output voltage at the single output. The first circuit output voltage has a first level on a condition that the power stage circuit is conducting at a peak current level. The first circuit output voltage has a second level on a condition that the power stage circuit is not conducting.

Abstract: Since in existent charge-discharge control the battery direct current resistance of a lithium ion battery increases at a low temperature or in a low SOC, the battery voltage may possibly exceed greatly the maximum allowable voltage instantaneously due to over-voltage during charging or may possibly decrease greatly to less than the minimum allowable voltage during discharging. If the lithium ion battery continuously lies in such a state the battery performance is degraded abruptly. The battery resistance of a lithium ion battery module is estimated in accordance with SOC and temperature of the lithium ion battery module, and current to charge is set properly based on the estimated battery resistance.

Abstract: A method includes receiving, at a voltage regulator, an activity adjustment signal from a digital circuit. The method also includes controlling one or more variable impedance elements of the voltage regulator to modify an output voltage provided to the digital circuit. The output voltage is based at least in part on the activity adjustment signal.

Abstract: A linear voltage regulator includes a Miller frequency compensation having a movable zero, which tracks the frequency of the load pole as the load condition changes. The compensated voltage regulator maintains stability under variable load conditions. Because of the Miller effect, DC open-loop gain and bandwidth are not sacrificed for stability. The compensated voltage regulator can therefore maintain high power supply rejection ratio (PSRR).

Abstract: A voltage adjustment circuit includes a programmable resistor, a keyboard, and a microprocessor control unit (MCU). The programmable resistor includes an input connected to a first power supply to receive a first voltage. The MCU is connected to the keyboard and the programmable resistor. A preset voltage is set through the keyboard. The MCU adjusts a resistance of the programmable resistor according to the preset voltage, such that the programmable resistor outputs a second voltage.

Abstract: The invention is for a 3-phase electronic tap changer commutation device to be utilized in electronic regulators, and more particularly to 3-phase alternating current (AC) electronic tap-changing voltage, current or phase correcting regulators. The present invention provides a specific transformer winding topology and commutation technique that improves performance and reduces cost compared to conventional methods.

Abstract: A power saving system for a household electric appliance includes a signal processing unit, a step down network having an adjustable impedance for stepping down an input voltage, and an impedance control switch electrically connected with the step down network and configured for controlling the impedance of the step down network. The signal processing unit is electrically connected to impedance control switch and configured to monitor the working condition of the household electric appliance, calculate the current demanded by the household electric appliance at a next moment, and transmit a signal to the impedance control switch so as to control the impedance control switch to adjust the impedance of the step down network according to the calculation.

Abstract: A system and method for providing variable power is disclosed. The system includes a power supply which provides power to at least one instrument. A pedal comprises a variable resistor that is configured to produce a resistance value within a predetermined range based on an amount of pressure which is being applied to the pedal. The voltage being supplied to the instrument is varied in accordance with the resistance value produced at the pedal.

Abstract: A voltage regulator includes a voltage regulator unit configured to output a step voltage and a damping resistance switching unit coupled between a load and an output node of the voltage regulator and configured to select an optimal damping resistance value based on a required load capacity.

Abstract: A switch circuit to control a high voltage source is presented. It includes a JFET transistor, a resistive device, a first transistor and a second transistor. The JFET transistor is coupled to the high voltage source. The first transistor is connected in serial with the JFET transistor to output a voltage in response to the high voltage source. The second transistor is coupled to control the first transistor and the JFET transistor in response to a control signal. The resistive device is coupled to the JFET transistor and the first transistor to provide a bias voltage to turn on the JFET transistor and the first transistor when the second transistor is turned off. Once the second transistor is turned on, the first transistor is turned off and the JFET transistor is negative biased.

Abstract: A power saving system for a household electric appliance includes a signal processing unit, a step down network having an adjustable impedance for stepping down an input voltage, and an impedance control switch electrically connected with the step down network and configured for controlling the impedance of the step down network. The signal processing unit is electrically connected to impedance control switch and configured to monitor the working condition of the household electric appliance, calculate the current demanded by the household electric appliance at a next moment, and transmit a signal to the impedance control switch so as to control the impedance control switch to adjust the impedance of the step down network according to the calculation.

Abstract: Embodiments provide systems, methods, and integrated circuits having a calibration structure with a calibration component and a measurement structure coupled to the calibration component. The measurement structure is configured to vary a current through the calibration component until a voltage of the calibration component equals an operation voltage. The variable current is a function of at least the operation voltage and a resistance of a resistor external to the measurement structure.

Abstract: The invention provides a novel 3-phase electronic tap changer commutation and related device. In one embodiment, the invention includes firing a commutation silicon controlled rectifier (SCR), removing a gating signal from a first SCR connected to a first of the plurality of taps, firing a second SCR connected to a second of the plurality of taps, and removing a gating signal from the commutation SCR.

Abstract: A dynamic braking load analyzer that determines the proper resistance value for a dynamic braking load resistor to be used in combination with a variable frequency drive or servo-drive to accommodate the power dissipated from an induction motor when it is being reduced in speed. The analyzer includes a resistor bank having a plurality of resistors electrically coupled in parallel. Switches are provided between the resistors, and a resistor selector switch determines which resistors are switched into the resistor bank circuit. A heat sensing resistor in the resistor bank measures the heat generated by the resistors and provides a signal that is read by a heat meter. The combination of the temperature measurement and the resistance of the resistors in the circuit gives the proper braking resistance value for the deceleration of the induction motor.

Abstract: A differential output circuit comprising: a first power supply line; a constant current source that includes a current input terminal coupled to the first power supply line; an output common mode voltage setting unit that includes a variable resistor element, one end of the variable resistor element being coupled to a current output terminal of the constant current source; and a signal transmission unit that includes a first power supply terminal and a second power supply terminal, the first power supply terminal being coupled to the other end of the variable resistor element, and the second power supply terminal being coupled to a second power supply line which supplies a voltage lower than a voltage of the first power supply line.

Abstract: The voltage stabilizer for stabilizing a voltage of a circuit includes a first resistor, a second resistor, a voltage controller, and a current supply unit. The voltage controller keeps a voltage of the first resistor constant. The current supply unit supplies a first current to between the first resistor and the second resistor when a second current in the circuit becomes equal to or larger than a predetermined value.

Abstract: A power supply circuit for a motherboard includes a first resistor, a second resistor, a Schottky diode, and a direct current (DC) voltage source. The Schottky diode includes a first anode, a second anode, and a cathode. The first anode of the Schottky diode is respectively coupled to terminals of the first and second resistors, another terminal of each of the first and second resistors is respectively coupled to a power supply and ground. The second anode of the Schottky diode is coupled to the DC voltage source, the cathode of the Schottky diode is coupled to a south bridge.

Abstract: A start up circuit for power converters is presented. It includes a JFET transistor, a resistive device, a first transistor, a second transistor and a diode. The JFET transistor is coupled to a voltage source. The first transistor is connected in serial with the JFET transistor to output a supply voltage to a control circuit of the power converter. The diode is connected from a transformer winding of the power converter to supply a further supply voltage to the control circuit of the power converter. The second transistor is coupled to control the first transistor and the JFET transistor in response to a control signal. The resistive device provides a bias voltage to turn on the JFET transistor and the first transistor when the second transistor is turned off. Once the second transistor is turned on, the first transistor is turned off and the JFET transistor is negative biased.

Abstract: An apparatus for issuance of at least one electrical output signal (Iout), wherein the desired electrical current level of the output signal (Iout) is predeterminable, including: at least one measuring resistor, at which the electrical current level of the output signal (Iout) is measurable; at least one adjuster, via which the electrical current level of the output signal (Iout) is settable; and at least one controller, which compares the electrical current level of the output signal (Iout) measured at the measuring resistor with the electrical current level desired for the output signal (Iout), and which controls the electrical current level of the output signal (Iout) via the adjuster; wherein the controller and the measuring resistor are connected with an electric base-potential (VGND); and wherein the base-potential (VGND) is a reference potential for the controller.

Abstract: A high-voltage device having a measuring resistor, also called a bleeder, is plunged into an electrical field whose voltage varies in the same way as the voltage along the bleeder. To achieve this, the capacitive elements are distributed in two rows, each row defining a plane. Along each row, the potentials are growing. The space between the two rows is sufficient for the bleeder to be placed therein. The bleeder is formed either by series-connected resistors or by a screen-printed resistor.

Abstract: An alterable DC power supply circuit includes a regulator, a resistor, and an adjustable load resistance. The regulator includes a voltage input pin, a voltage output pin, and an adjusting pin. The resistor is coupled between the voltage output pin and the adjusting pin. The adjustable load resistance is coupled between the adjusting pin and ground. The output voltage of the alterable DC power supply is adjustable by adjusting the adjustable load resistance. Using this alterable DC power supply to test the voltage stability of a chipset improves testing efficiency.

Abstract: The multiplication circuitry of the present invention operates to generate multiple monolithic electrical currents, all referenced to a single external resistor. A first current referenced to a first monolithic resistor, a second current referenced to a second monolithic resistor, and a third current referenced to an external resistor are used to generate an output current, which is also referenced to the external resistor. The present invention accurately generates two currents each being referenced to the single external resistor, while simultaneously minimizing the number of external connections and overall cost of producing the circuitry.

Abstract: A temperature characteristic compensating circuit is capable of carrying out temperature compensation of a signal that varies in proportion to absolute temperature by analog processing and without using a thermistor, to thereby enable use of a smaller IC. A first current source supplies a first current that is proportional to the absolute temperature and inversely proportional to the resistance value of a first resistor. A second current source supplies a second current that is inversely proportional to the resistance value of a second resistor. A first circuit carries out logarithmic compression of an input voltage using the first current as a bias current, and a second circuit carries out logarithmic expansion of the logarithmically compressed voltage using the second current as a bias current. The gain of the logarithmically expanded voltage relative to the input voltage is proportional to the ratio of the second current to the first current.

Abstract: A power supply circuit for an integrated-circuits chip includes variable resistors for establishing an internal voltage for the chip. The internal voltage is variable with the variable resistors and compared by a comparator to a test voltage supplied from an external test circuit. A first buffer amplifier, powered by an externally supplied voltage, amplifies the output of the comparator to produce output voltages of opposite polarities. A second buffer amplifier, powered by the externally supplied voltage, amplifies the output voltages of the first buffer amplifier to supply an output voltage to the test circuit. In a modified embodiment, a second voltage source is additionally provided to establish a second internal voltage higher than the internal voltage produced by the first reference voltage source. The first buffer amplifier is powered by the second internal voltage, instead of by the first internal voltage, to amplify the output of the comparator.

Abstract: A power supply (10) including a virtual resistor. The power supply (10) includes (i) a power stage (11) having an input (12) for accepting unregulated power, an output (14) for providing regulated power, a control input (13) and a current sense output (16); (ii) a control circuit (15) including an error amplifier (19) having an inverting input coupled to the output (14) and an output coupled to the control input (13); and (iii) a virtual resistance generator (25) having an input coupled to the output of the error amplifier (19) and an output coupled to a non inverting input of the error amplifier (19). The virtual resistance generator (25) is for supplying a reference voltage (27) to the control circuit (15) such that a voltage present at the output for providing regulated power (14) as a function of current leaving the output for providing regulated power (14) provides an output virtual resistance.

Abstract: The present invention describes a resistance reference circuit that includes a reference resistor that is substantially independent of temperature variations to which the resistance reference circuit is subjected. Also provided is a resistor network that may be dependant upon the temperature variations, and a current source circuit that provides first and second currents to the reference resistor and the resistor network. A circuit that is responsive to voltages developed across the reference resistor and the resistor network modifies the resistance value of the resistor network such that its resistance value is maintained the same as that of the reference resistor.

Abstract: Systems for controlling the current consumption of an integrated circuit chip and the like so as to reduce the inductive voltage drops occurring over the power supply lines within the chip and power supply lines to the chip are disclosed. The systems according to the present invention are applicable to circuits having two or more sub-circuits formed on a semiconductor substrate, each sub-circuit having two or more power supply inputs. An exemplary system comprises two or more current shunting elements formed on the substrate, with each current shunting element coupled in parallel with the power supply inputs of a selected sub-circuit. The system has at least two main power supply lines formed on the semiconductor substrate, with each selected sub-circuit having each of its power supply inputs coupled to a main power supply line. A current shunting element may comprise a Zener diode, an active shunt circuit, or equivalents thereof.

Abstract: A sensor contactlessly driven by a single power supply is disclosed. A current flows in a resistor R.sub.L through the secondary winding of a coil in the direction corresponding to the direction of magnetic fluxes generated in the coil in accordance with discharge or charge mode of a main battery. The input terminal of a voltage follower is connected to the voltage-dividing point of a series circuit including resistors R.sub.1 and R.sub.2 and a reference voltage control circuit. The reference voltage control circuit changes the input voltage of the voltage follower in accordance with the direction of the current flowing in the resistor R.sub.L. It follows therefore that the measurement range is switched in accordance with discharge or charge mode of the main battery, with the result that the overall measurement range can be widened in spite of the fact that only a single power supply +Vcc is used.

Abstract: Electronic circuitry for simulating the resistance characteristics of a variable resistance temperature sensing element includes a multiplier that multiplies the difference between a reference voltage and a desired value of a control voltage times the voltage across a precision resistor at the output of the circuitry. The multiplier product output signal is integrated and a voltage value of the integrator output controls the gate terminal of a field effect transistor. The drain and source terminals of the transistor are connected in series with the precision resistor. The combination of the current through the precision resistor and the transistor (or the voltage across the precision resistor), together with the voltage value of the control signal, controls the voltage input value to the integrator, which, in turn, controls the resulting resistance across the output terminals of the transistor.

Abstract: An attenuator includes first resistors that are connected in series to each other at connection nodes and between an input node and a fixed voltage node, voltage output nodes coupled to the input node and the respective connection nodes of the first resistors, switches and corresponding second resistors being respectively connected in series between the connection nodes and voltage output nodes and commonly connected to an output node, and a load capacitance connected between an output node and the fixed voltage node. The phase between input and output signals is independent of the attenuation. A phase difference is added by the second resistor so that the phase shift determined by the voltage dividing ratio of the first resistors selected by closing a switch and by the value of the load capacitance is compensated.

Abstract: In a semiconductor integrated circuit for taking in an external power source voltage from outside the semiconductor chip, the external power source voltage is dropped by a voltage dropping unit installed inside the semiconductor chip and the external power source voltage in the semiconductor integrated circuit, as dropped is supplied as an internal power source voltage to the semiconductor chip and used as the internal power source voltage, a plurality of voltage dropping units are installed for each of a plurality of semiconductor circuit block installed inside the semiconductor chip, and the voltage fluctuation of an internal power source is effectively suppressed in the event that a circuit consuming a very high current is operated.

Abstract: A signal level attenuating device having an analog attenuator and a digital attenuator which respectively include resistance attenuators. The resistance attenuators have the same attenuating characteristics and are mutually coupled. When one of the resistance attenuators is adjusted, the other of the resistance attenuators is simultaneously adjusted so that an analog signal and a digital signal respectively entered therein are attenuated at an identical attenuating factor. The digital attenuator further comprises an A/D convertor, a coefficient generator and a multiplier. The resistance attenuator in the digital attenuator attenuates a reference voltage and sends it to the A/D convertor. The coefficient generator computes an attenuation coefficient by which the digital signal entered therein is to be multiplied, based on an output of the A/D convertor. The digital signal is multiplied by the attenuation coefficient in the multiplier.

Abstract: A resistor has a resistance which is precisely controlled by means of a voltage control circuit. The controlled resistor is a radiation sensitive device which is optically coupled to a source of radiation connected to the output of an operational amplifier. A control circuit applies a controllable (preferably programmable) voltage, functionally related to a desired resistance of the controlled resistor, to the input of the operational amplifier. Also connected to the input of the operational amplifier is a feedback radiation sensitive resistor, which is also optically coupled to the radiation source. Preferably, the controlled radiation sensitive resistor and the feedback radiation sensitive resistor have substantially identical resistance characteristics. A compensation circuit is electrically connected between the input and output of the operational amplifier.

Abstract: A constant-voltage regulated power supply circuit has an input circuit and an output circuit. The sense circuit includes a programmable sense circuit that further includes a divider network with a plurality of selectable tap points and a multiplexer having a plurality of inputs and an output with each tap point being connected to an individual input of the multiplexer. A controllable pass element is operatively connected in the power supply circuit between the input circuit and the output circuit. A comparator connected to receive inputs from a selected tap point and a reference voltage generating circuit provides an output to control the controllable pass element.

Abstract: A circuit for providing a controlled resistance, the circuit comprising a pair of terminals for input of an excitation current, variable resistance means connected in the current path between the terminals, means for deriving a first signal representing the value of the voltage appearing across the terminals, means for deriving a second signal representing the value of the excitation current, means for generating a third signal representing a selected value of resistance to be provided between the pair of terminals, means for comparing the ratio of the first and second signals with the value of the third signal to derive a difference signal, and means for applying the difference signal to cause the variable resistance means to change in value such that said ratio tends towards exact equality with the selected value of resistance.

Abstract: A multilayer ceramic integrated circuit packaging substrate provides a plurality of integrated circuit operating voltages at the integrated circuit mounting surface thereof without requiring a separate input/output pin and internal power distribution plane for every integrated circuit operating voltage. The substrate includes a power via for supplying a first integrated circuit operating voltage at the integrated circuit mounting surface, and a plurality of voltage converting means on the integrated circuit mounting surface for stepping down the first operating voltage to all other requisite operating voltages. The voltage converting means may be resistors or operational amplifier voltage dividers.

Abstract: Radio frequency chokes for use in combining and separating radio frequency signals and single phase AC power in the equipment used in cable transmission and distribution systems. The radio frequency chokes include a conductor wound on a magnetic core to form a primary winding upon which first and second swamping circuits are mounted. Each of the swamping circuits include a secondary winding with a resistor connected across the ends thereof with the swamping circuits effectively dampening parasitic resonances in the primary winding which occur in the frequeny range of from about 5 MHz to at least 800 MHz.

Abstract: A voltage divider used to supply multiple reference voltages is energized electrically, in shunt, by a constant voltage generator and, in series, by a constant current generator. The magnitude of current supplied by the constant current generator determines the voltage drops across successive resistor stages of the voltage divider, while the magnitude of voltage supplied by the constant voltage generator determines the voltage level, with respect to ground, of the voltage-divider tap to which the constant voltage generator is connected. Since these two generators are independent of each other, it is possible to independently control the range and zero point settings of a voltage divider.

Abstract: A passive control network for connection between a pair of load output level setting terminals, as on a ballast for a dimmable fluorescent lamp in a lighting system, to provide a required variable impedance, where the magnitude of the impedance establishes the load output level. The passive control network includes an isolation transformer for coupling a periodic waveform at the load input terminals to the variable impedance component, the magnitude of which impedance is reflected through the transformer to provide the load level-setting impedance.

Abstract: A simplified, small-sized RV generator has a power source with a voltage adjusting circuit. The adjusting circuit includes a plurality of polysilicon resistors connected serially with polysilicon fuses connected in parallel with and to both ends of each of the resistors. A resistor network is connected to the voltage adjusting circuit and composed of a plurality of polysilicon resistors for providing a reference voltage, based on the output voltage of the adjusting circuit.

Abstract: Disclosed is a manual control means for motor-assisted manual control of a motor-driven member.A control handle bears against the centre of a deformable diaphragm in the form of a cross. The outer end of each of the arms of the diaphragm is mounted to pivot freely in a fixed support means. When the diaphragm is deformed by movements of the handle, pairs of strain gauges attached to each of the arms produce electrical signals which are processed for use to control the motor-driven member to cause it to be driven in the sense of the movement of the handle.