Abstract: A system is disclosed. The system includes a central processing unit (CPU) to operate in one or more low power sleep states, and a power converter. The power converter includes phase inductors; and one or more power switches to drive the phase inductors. The one or more power switches are deactivated during the CPU sleep state.

Abstract: A standby regulator circuit includes a standby bias circuit and a standby operational amplifier. The standby regulator circuit provides a standby regulated control voltage to a multiplexer. A regular operational amplifier provides a regulated control voltage to the multiplexer. During regular operation, the multiplexer selects the regular operational amplifier and selects the standby regulator circuit in a low-power mode. The multiplexer couples to a native pass transistor gate having a threshold voltage about equal to 0 V. The native pass transistor provides a regulated output voltage with relatively low-level input control voltages. In low-power mode, a power-down signal, provided to the multiplexer, smoothly transitions regulated control voltage from the regular operational amplifier to regulated control voltage sourcing from the standby operational amplifier.

Abstract: A switched mode power supply (SMPS) suitable for use with a transmitter is disclosed. A digital signal processing unit, using a reference voltage and a voltage signal from the power source as inputs, determines the duty cycle for a voltage converter, such as a buck-boost converter, of the SMPS.

Abstract: There is provided a power-supply platform IC for realizing a parameter-deciding power-supply circuit, which, in order to decide a parameter of a power-supply circuit that supplies power to an electronic circuit IC (load), is connected to the electronic circuit IC (load) in place of the power-supply circuit. The power-supply platform IC includes: one or more transistor arrays that include a plurality of transistors operable as switching transistors; and a selecting circuit for selecting a transistor to be operated as a switching transistor from among the plurality of transistors, so as to control a size of the transistor that operates as a switching transistor, wherein the selecting circuit varies the size of the transistor as a parameter of the power-supply circuit, according to an external command.

Abstract: A power supply voltage controlling circuit has a voltage regulator circuit that supplies a current to an output terminal from at least any of a first power supply and a second power supply, and compares an output voltage at the output terminal with a first reference voltage to adjust the output voltage to approach the first reference voltage; and a controller circuit that supplies the first reference voltage to the voltage regulator circuit and controls the voltage regulator circuit by outputting, to the voltage regulator circuit, at least any of a first enable signal for enabling the first power supply to supply a current to the output terminal and a second enable signal for enabling the second power supply to supply a current to the output terminal.

Abstract: A switching regulator integrated circuit (IC) is disclosed that includes a switch circuit that further includes a first switch and a second switch, a mode selector circuit controlled by external circuitry to select between a first mode and a second mode, and a control circuit. In response to a feedback signal from the switch circuit, when the first mode is selected, the control circuit toggles the first switch and the second switch ON and OFF alternately at a fixed first frequency. When a second mode is selected, the control circuit causes the second switch to turn OFF completely and the first switch to switch ON and OFF at a variable second frequency.

Abstract: In some embodiments of the invention, a processor with a power management scheme using dynamically switchable embedded power gates.

Abstract: A ladder resistor circuit generates a plurality of different reference voltages. A plurality of switching circuits correspond to a plurality of taps of the ladder resistor circuit. Each of the plurality of switching circuits is connected at one end to a corresponding one of the taps and connected at the other end to an output node, and has a variable on-resistance value. A control circuit selects continuous n (where n is any integer equal to or greater than 2) of the plurality of switching circuits, turns the n switching circuits on, and sets the respective on-resistance values of the n switching circuits.

Abstract: An electronic circuit power supply device configured to selectively apply at least one first voltage or one second voltage to a power supply terminal of the electronic circuit that includes elements for applying to the power supply terminal a voltage variable from a value equal to the first voltage to a value equal to the second voltage and elements designed for selecting application of the second voltage to the power supply terminal when the variable voltage reaches the second voltage.

Abstract: A power supply system comprises a parallel arrangement of a first switched mode power supply (1) which has a first system bandwidth (LB1) and a second switched mode power supply (2) which has a second system bandwidth (LB2) covering higher frequencies than the first system bandwidth (LB1). The first switched mode power supply (1) is dimensioned to supply a first maximal output power (P1m), the second switched mode power supply (2) is dimensioned to supply a second maximal output power (P2m) being smaller than the first maximal output power (P1m). A control circuit (3) varies a reference voltage (Vr) of both the first switched mode power supply (1) and the second switched mode power supply (2) to obtain a corresponding variation of an output voltage (Vout) of the parallel arrangement.

Abstract: A circuit for, and method of, changing transient response characteristics of a DC/DC converter module having an output rail pin and a trim pin and a distributed power conversion system incorporating the system or the method. In one embodiment, the system includes a reactive component coupled to the output rail pin and the trim pin of the DC/DC converter module and configured to interact with at least one network internal to the DC/DC converter module to change the transient response characteristics.

Abstract: The present invention relates to a sag-swell generator for generating power signal with sag, swell and outage for use in testing custom power devices. The sag-swell generator comprises: a supply voltage unit for providing a supply voltage; a variable voltage adjusting unit for controlling the supply voltage according to a voltage ratio; a variable voltage-side switch unit selectively connected to the variable voltage adjusting unit; a transformer-side switch unit composed of dual switches connected anti-parallel to each other; and a transformer, a primary side of which being connected to the transformer-side switch unit and a secondary side of which being serially connected to a load and a (?) terminal of the supply voltage.

Abstract: A power supply, and a method of controlling the power supply, in which more or less power capacity of the power supply is activated depending on the state of a digital data signal on a data bus. The power supply has a control circuit which detects the number of “zero” bits present on the data bus, and responsively activates one or more of a plurality of power supply circuits such as charge pump circuits. The outputs of the charge pump circuits are mutually connected to a driver adapted to program memory cells of a flash memory circuit.

Abstract: The present invention proposes a voltage-regulator and a power supply having a current-sharing circuit. The voltage-regulator capable of current sharing uses an enabling terminal as a current-sharing control interface. A pass transistor supplies an output voltage and an output current to an output terminal of the voltage-regulator. A feedback control circuit generates a control signal to control the pass transistor in response to a reference voltage. A current-sharing unit is coupled to the enabling terminal and the feedback control circuit for generating a bus signal in response to the current-sense signal and the reference voltage and generating the reference signal in response to the reference voltage, the bus signal and the current-sense signal.

Abstract: A system comprises power management logic and an electrical load coupled to the power management logic. The electrical load is configurable to operate in accordance with any of a plurality of power states. The power management logic forces the electrical load to operate in a reduced power state if an operating voltage for the system is between two thresholds.

Abstract: An integrated circuit device for delivering power to a load includes a P-MOS power transistor, an N-MOS bypass transistor and a gate driver circuit. The P-MOS power transistor is coupled between a supply voltage node and a power output node of the integrated circuit device, and the N-MOS bypass transistor is coupled between the power output node and a reference node of the integrated circuit device. The gate driver circuit responds to a pulse-width-modulated (PWM) control signal by outputting an active-low drive-enable signal to a gate terminal of the P-MOS power transistor and an active-high bypass-enable signal to a gate terminal of the N-MOS bypass transistor during respective, non-overlapping intervals.

Abstract: In a power supply apparatus, in a standby mode, control signals for controlling a first MOSFET of a power supply apparatus to be turned on and a second MOSFET to be turned off are supplied to the gates of the first and second MOSFETs from a control circuit, respectively. The emitter of a PNP transistor is connected to the gate of the second MOSFET through a diode of a switch circuit and the collector is connected to the ground. A power supply operation control signal is input to the base of the PNP transistor. When a power supply operation control signal in a Low state is input to the base in a standby mode, the emitter and the collector are connected to each other. Accordingly, the gate of the second MOSFET has a potential substantially the same as a ground potential and the second MOSFET is turned off irrespective of the control signal.

Abstract: This interface is an apparatus for controlling a power supply delivering power to a DC powered tool. The interface is connected between the DC power supply and the DC tool wherein the interface is configured to read signals from the tool and control the power supplied by allowing the power supply to run, brake, reverse or jog the tool. A microprocessor is connected to the interface programmed to provide a specific power in response to the signals from the tool read by the interface. The interface includes a number of field effect transistors. They are PFET1, PFET2, NFET1, and NFET2.

Abstract: A direct current power supply apparatus includes a first power supply circuit and a second power supply circuit. The first power supply circuit converts a source voltage from an externally supplied direct current power source into a first voltage and provides the first voltage to an output terminal. The second power supply circuit converts the source voltage from the externally supplied direct current power source into a second voltage and provides the second voltage to the output terminal. The second power supply circuit is controlled to be turned on and off. The first power supply circuit detects voltage at the output terminal and, when the second voltage is not being provided because the second power supply circuit is inactivated, provides the first voltage.

Abstract: A method for controlling a power level supplied to a load by an auxiliary output of a power source is presented. The method includes providing a power source having a user-adjustable main output and an auxiliary output. The method further includes providing a controller that is operative to control the level of the auxiliary output, the controller having at least supply and programming modes of operation. The method still further includes selecting the programming mode and adjusting the power level of the auxiliary output to a desired level while in the programming mode, thereby defining a programmed desired level. The method yet still further includes storing the programmed desired level in the controller, and then controlling the auxiliary output to the programmed desired level while operating the power source in the supply mode. The method further includes delivering power to the load in accordance with the stored desired power level.

Abstract: A power supply, and a method of controlling the power supply, in which more or less power capacity of the power supply is activated depending on the state of a digital data signal on a data bus. The power supply has a control circuit which detects the number of “zero” bits present on the data bus, and responsively activates one or more of a plurality of power supply circuits such as charge pump circuits. The outputs of the charge pump circuits are mutually connected to a driver adapted to program memory cells of a flash memory circuit.

Abstract: A command transmission/reception section (4R), a power-control determination section (8) and a power control section (9) are provided in a controlled device (3) which is connected to a network (1) and which performs power control in response to a command transmitted from a control device (2). Upon receipt of a power control command from the control device (2), the power-control determination section (8) determines as to power-on/power-off in units of a block, and performs power control on the basis of a result of the determination. Consequently, unnecessary power-on in, for example, video reservation can be prevented.

Abstract: In accordance with an embodiment of the disclosed matter, a voltage regulator may supply power to one or more components within a computer system. The voltage regulator may include an inductor and a current detection circuit to detect current through the inductor. When the inductor current is detected to be above a threshold, the voltage regulator operates synchronously. When the inductor current is detected to be below the threshold, the voltage regulator operates non-synchronously.

Abstract: Power is applied to a voltage supply. A signal that indicates reduced work capability in an integrated circuit (IC) that is being powered by the voltage supply is generated based on workload demand or conscious power and performance tradeoffs. This signal is applied to increase the power efficiency of the voltage supply, while the supply is powering the IC in its reduced work capability state.

Abstract: A plurality of switching transistors is provided, each connects power supply terminals of a plurality of first circuit blocks to a power supply line, respectively. Among the first circuit blocks, the power supply terminals of the first circuit blocks operating at different timings are connected by an internal power supply line. A power supply control circuit simultaneously turns on the switching transistors connected to the internal power supply line, in response to operation(s) of at least any one of the first circuit blocks connected to the internal power supply line. Since the switching transistors can be shared among the first circuit blocks not operating simultaneously, operation speed of the first circuit blocks can be increased. Since a total size of the switching transistors can be made small, standby current can be decreased. Accordingly, a semiconductor integrated circuit operating at a high speed can be constituted without increasing the standby current.

Abstract: In order to maintain printing machinery in a monitored operating state during line voltage interference and outages, the rotary printing machine is supplied by an interruption-free power supply (USV) having an input side which is connected to the customer mains and an output connected to the printing machine.

Abstract: There is disclosed an adaptive voltage power supply that finely adjusts VDD to an optimum level. The adaptive voltage power supply comprises: 1) a first charging circuit capable of increasing a reference voltage on a charge capacitor in response to receipt of a first VDD control signal; 2) a second charging circuit capable of decreasing the reference voltage on the charge capacitor in response to receipt of a second VDD control signal; and 3) a power supply capable of receiving the reference voltage on the charge capacitor and generating an output power level, VDD, determined by a level of the reference voltage.

Abstract: A method and apparatus for regulating a DC power supply, adaptable for use with a motion sensor switch, by limiting the leakage to ground current of the power supply to comply with U.L. Standards while also enabling the DC power supply to provide a stable DC output voltage which is essentially unaffected by changes in magnitude of the AC supply voltage or changes in ambient temperature. The method and apparatus employs first and second transistors, in which the base and collector of the first transistor and the base and collector of the second transistor are coupled to receive a voltage based on the AC supply voltage, and the emitter of both the first and second transistors are coupled to drive an output circuit of the DC power supply. The emitter of the second transistor is also coupled via a first resistor to the base of the first transistor, and the collector of the second transistor is also coupled via a second resistor to the base of the first transistor.

Abstract: In order to maintain printing machinery in a monitored operating state during line voltage interference and outages, the rotary printing machine is supplied by an interruption-free power supply (USV) having an input side which is connected to the customer mains and an output connected to the printing machine.

Abstract: A method and apparatus for regulating a DC power supply, adaptable for use with a motion sensor switch, by limiting the leakage to ground current of the power supply to comply with U.L. Standards while also enabling the DC power supply to provide a stable DC output voltage which is essentially unaffected by changes in magnitude of the AC supply voltage or changes in ambient temperature. The method and apparatus employs first and second transistors, in which the base and collector of the first transistor and the base and collector of the second transistor are coupled to receive a voltage based on the AC supply voltage, and the emitter of both the first and second transistors are coupled to drive an output circuit of the DC power supply. The emitter of the second transistor is also coupled via a first resistor to the base of the first transistor, and the collector of the second transistor is also coupled via a second resistor to the base of the first transistor.

Abstract: A power supply apparatus is provided, which includes a power supply section, a switch device having at least two microswitches, and a microcontroller. The switch device further includes an assembly holder, and a printed circuit board accommodating the microswitches thereon, a pushbutton with at least two legs, and elastic member. The microcontroller controls the power supply section in accordance with the states of the microswitches. The microcontroller determines erroneous operation of a pushbutton.

Abstract: A bi-directional power converter apparatus and method of conversion is disclosed which comprises three active elements (output, primary, and auxiliary switches) and two passive components (primary and auxiliary energy storage elements) coupled so as to enable operation in any one of several different power conversion modes, including: a Non-Assisted Generation mode, a Super-Assisted Generation mode, a Super-Assisted Regeneration mode, an Auxiliary Generation mode, and an Output Regeneration mode. The individual components operate in a synergistic fashion to enable the free, bi-directional, transfer of power from primary and auxiliary energy sources to a load, and from the load to the primary and auxiliary energy sources. Further, the invention operates in such a way as to dramatically reduce the effective boost/buck ratios required for low voltage energy sources connected to a high voltage output power bus.

Abstract: A load controller and method are provided for maximizing effective capacity of a non-controllable, renewable power supply coupled to a variable electrical load also coupled to a conventional power grid. Effective capacity is enhanced by monitoring power output of the renewable supply and loading, and comparing the loading against the power output and a load adjustment threshold determined from an expected peak loading. A value for a load adjustment parameter is calculated by subtracting the renewable supply output and the load adjustment parameter from the current load. This value is then employed to control the variable load in an amount proportional to the value of the load control parameter when the parameter is within a predefined range. By so controlling the load, the effective capacity of the non-controllable, renewable power supply is increased without any attempt at operational feedback control of the renewable supply.

Abstract: A method for the low-transient power control of electrical loads, particularly temperature-dependent loads electrically divided into essentially equal sub-loads connectable to an a.c. mains in order to receive power. Power control at low power levels utilizes alternately power-off phases, in which none of the sub-loads receive power for at least three a.c. half-waves, and heating phases, in which a temporal concatenation of at least a first and a second basic cycle of three a.c. half-waves supply power to each one of the sub-loads. The first sub-load receives power during one half-wave of the first basic cycle and the second sub-load receives power during one half-wave of the second basic cycle. The power is turned off during the other two half-waves of the first and the second basic cycle. Also disclosed is an electrical heating apparatus which embodies this method.

Abstract: A semiconductor device, equipped with a circuit for regulating an internal power source by using a plurality of fuses, includes a fuse group for trimming a power source, having a plurality of fuses capable of being cut off so as to regulate a voltage level of an internal power source; a decoding unit for fuse information of the internal power source, for decoding fuse information in response to a cut-off state of each of these fuses and outputting bit information corresponding to the thus regulated voltage level of the internal power source; and a voltage level regulating unit for a spare fuse pattern, for generating at least one spare pattern other than patters of the bit information used at present and for regulating the voltage level of the internal power source. The voltage level of the internal power source is regulated so that the spare pattern corresponds to any one of the patterns of the bit information used at present.

Abstract: A voltage regulator circuit that minimizes the bias current flowing between a first voltage terminal and a second voltage terminal. The circuit receives input signals via a first and a second input terminal, and provides an output signal via an output terminal. The circuit includes a differential input stage, an output stage, a first sub-circuit for reducing the current flowing through the output stage between the first voltage terminal and the output terminal, and a second sub-circuit for reducing the current flowing through the output stage between the output terminal and the second input terminal. An alternative embodiment combines the power reduction circuitry with additional circuitry decoupling the input and output stages to provide enhanced design flexibility.

Abstract: According to a first aspect of the invention, a power control switch comprises two solid state switching elements (14, 15) in parallel, the second switching element (15) having a higher resistance but faster turn-off time than the first element. In operation the switch is pulse width modulated and the first element is switched off after the second element to establish a guard period, the duration of which is controlled in dependence upon the duty cycle to provide efficient switching. According to a second aspect of the invention a power control switch comprises a switching element (14 or 15) controlled by a field programmable gate array (5) which is preferably programmed by an erasable programmable read only memory (EPROM), thereby providing a reconfigurable control means.

Abstract: A dual voltage generation circuit, responsive to a switching signal, to selectively generates a constant voltage at an output terminal is provided. The generation circuit comprises a switch transistor, a first and a second zener diodes and a diode. As the switching signal is logic high, at the output terminal, the circuit outputs a first constant voltage, and as the switching signal is logic low, the circuit outputs a second constant voltage.

Abstract: A pulse width modulation type power supply modulator capable of operating at high switching frequencies (>10 MHz) is achieved by eliminating resonant circuits which limit the maximal switching frequency. The modulator includes a power circuit including a power transistor, a first control circuit connected to the gate of the power transistor and a second control circuit connected to the output of the power circuit. In a preferred embodiment the active components are isolated from each other by areas of metalization on a printed circuit to minimize unwanted coupling and the electrical lengths are minimized.

Abstract: The power supply modules, together feeding a load (between the terminals 13 and 12) with the voltage V.sub.0, comprise blocking diodes D.sub.1 (or D.sub.2). A feedback loop controls the output voltage (controller 14 and comparator 15 which receives V.sub.ref1 (or V.sub.ref2)). Two output voltage terminals are used for locking, on the two electrodes of D.sub.1, the voltages V.sub.1 and V.sub.0 (or D.sub.2 with the voltage V.sub.2 and V.sub.0), and are connected to inputs of output voltage selection means (31) which are suitable to supply either the voltage kV.sub.0 (k.ltoreq.1) when D.sub.1 (or D.sub.2) is conductive, or the voltage kV.sub.1 =V.sub.ref1 (or kV.sub.2 =V.sub.ref2) when D.sub.1 (or D.sub.2) is blocked.

Abstract: An MOS voltage-controlled resistor is disclosed. The voltage-controlled resistor comprises a first triode MOSFET, a second triode MOSFET, and a single diode connected MOSFET. The single diode connected MOSFET is coupled in series with the first triode MOSFET. These two MOSFETs in series, are in turn, coupled in parallel with the second triode MOSFET. A control voltage, V.sub.CONTROL, is applied from the gates to the sources of the first and second triode MOSFETs. A voltage-controlled resistance can then be measured between the two nodes defining the parallel coupling of, the single diode connected MOSFET in series with the first triode MOSFET, with the second triode MOSFET.

Abstract: A programmable reference voltage generator includes a diode arrangement for generating a reference voltage in response to a control current. An array of memory cells is provided for adjusting the control current, the memory cell array including a plurality of memory cells connected to the diode arrangement through a plurality of current paths. Each of the memory cells is disposed to conduct current when programmed to store a first binary value, and to not conduct current when programmed to store a second binary value. A programming circuit is used to store a selected one of the first and second binary values in each memory cell, thereby causing the reference voltage to assume a selected magnitude.

Abstract: A power efficient amplifier uses two stages, a low voltage stage and a high voltage stage. The low voltage stage supplies a nominal operating current to a load from a low voltage low power output when the requirements are small, and the high voltage stage supplies a desired output current to the load exceeding the nominal operating current when the load requires such. Switching to the high voltage output stage in response to sensing current to the load exceeding the nominal operating current conserves energy and increases operational efficiency. The amplifier circuitry produces a power efficient voltage-to-current transformation. The circuitry includes an operational amplifier that receives a signal proportional to the current flowing to the load and, an input signal which represents the desired load current. When the output increases above a certain level, it turns off the low voltage stage and turns on the high voltage stage causing the available output power to increase.

Abstract: A flexible reference voltage circuit includes a circuit for producing a first digital signal representative of a range of reference voltage levels; a circuit for producing a second digital signal representative of a selected reference voltage level within the range of reference voltage levels; an adder for adding the first and second digital signals to produce a third digital signal; and a digital to analog converter for providing an output voltage in response to the third digital signal. The method of producing a flexible reference voltage performed by the circuit is also claimed. The invention can be used with a differential protection circuit to provide a series of trip level ranges, with a series of selectable trip levels in each range. This is accomplished in a high accuracy circuit which is relatively simple to construct, thereby minimizing size and complexity of the current sensor module, in differential protection applications, or the circuitry, if used in a power system controller.

Abstract: An inexpensive circuit for controlling the recharging of a rechargeable power source by a photovoltaic panel is used for powering a load such as the lamp of a walk light. Using a minimum number of components, the circuit can charge a rechargeable battery anytime sunlight is sufficient to place a potential across the battery that is greater than the present potential of the battery, can sense a decrease in voltage across the photovoltaic panel with diminishing ambient light and energize the load, can prevent the load from being energized when the ambient light level is sufficient to re-charge the battery, can provide positive feedback at turn-on of the load, thereby hastening turn-on and providing hysteresis, can provide for adjusting the hysteresis bands, can shift the turn-on and turn-off thresholds, and can provide an adequate current to guarantee turn-on when using low leakage solar panels.

Abstract: An electronic circuit (100) includes a load stage circuit (116) having at least one FET (118 and 120). The load stage circuit (116) includes an adjustment terminal responsive to an adjustment voltage for controlling the load resistance of the FET (118 and 120). The electronic circuit (100) also includes a bias current generator (124) for generating a bias current. A current steering circuit (122) controls the amount of bias current supplied to the load stage circuit (116). The electronic circuit (100) also includes a plurality of output terminals (112 and 114) for providing an output which is responsive to voltages applied at input terminals (104, 106 and 108) of the current steering circuit (122). Circuit (100) alllows for the adjustment of the bias current to the circuit in order to achieve optimum power dissipation over changing operating conditions.

Abstract: A programmable power supply having a plurality of channels wherein each channel is adapted to output a selectable DC voltage, AC voltage, DC current or AC current. Each channel is adapted to select a DC reference signal or an AC reference signal and to scale the selected DC reference or the AC reference to output the selected signal. The outputted selected signals are monitored to provide a monitored channel signal indicating the value of the selected signal. The programmable power supply outputs monitored channel signals for each of the channels in a human perceivable format such as a display or printed format. At least some of the channels are adapted to be connectable to a temperature probe which outputs temperature signals and, in this embodiment, the temperature signals are monitored to provide monitored channel temperature signals, the monitored channel temperature signals being outputted in a human perceivable format such as a display or printed format or both.

Abstract: A seven decade, voltage controlled current source is described for use in testing intermediate range nuclear instruments that covers the entire test current range of from 10 picoamperes to 100 microamperes. High accuracy is obtained throughout the entire seven decades of output current with circuitry that includes a coordinated switching scheme responsive to the input signal from a hybrid computer to control the input voltage to an antilog amplifier, and to selectively connect a resistance to the antilog amplifier output to provide a continuous output current source as a function of a preset range of input voltage. An operator controlled switch provides current adjustment for operation in either a real-time simulation test mode or a time response test mode.

Abstract: The bidirectional switching power apparatus converts DC input voltage into single AC or multiple DC output voltages. Power transformer is used if line isolation is necessary. Number of switching components and peak currents thereof are minimal. The DC input voltage is lower than the AC or DC output voltages. The switching power apparatus has a first and second capacitors coupled to ground for storing a first and second voltages respectively. One switch selectively applies the DC input voltage across an inductor which attains a current. Another switch selectively applies the current to ground. A diode applies the current to the first capacitor. An amplifier converts the first and second voltages into the AC output signal. Two other diodes apply the second voltage and AC output signal to a node. The DC input voltage is referenced to the node rather than ground.

Abstract: Disclosed is a power system for use with a computer, the power system having incorporated in it circuitry for automatically varying the supply voltage output to the computer system based upon the magnitude of the current being supplied to the computer by the power system. Also included in the computer system is a variable frequency clock circuit, the frequency of which changes based upon the supply voltage produced by the power system. This permits, during computer system operation where low voltage and low clock speeds will be sufficient to provide the performance needed, achievement of a power saving since both the voltage and frequency at which the system operates is reduced, thereby markedly reducing the power consumption.