WO2001031423A1 - Method and device for controlling a dc/dc converter - Google Patents

Method and device for controlling a dc/dc converter Download PDF

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Publication number
WO2001031423A1
WO2001031423A1 PCT/EP2000/009945 EP0009945W WO0131423A1 WO 2001031423 A1 WO2001031423 A1 WO 2001031423A1 EP 0009945 W EP0009945 W EP 0009945W WO 0131423 A1 WO0131423 A1 WO 0131423A1
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WO
WIPO (PCT)
Prior art keywords
voltage
supply voltage
control
application circuitry
circuitry
Prior art date
Application number
PCT/EP2000/009945
Other languages
French (fr)
Inventor
Rolf F. P. Becker
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to EP99203550.1 priority Critical
Priority to EP99203550 priority
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2001031423A1 publication Critical patent/WO2001031423A1/en

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Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00Details not covered by groups G06F3/00 – G06F13/00 and G06F21/00
    • G06F1/26Power supply means, e.g. regulation thereof
    • G06F1/32Means for saving power
    • G06F1/3203Power management, i.e. event-based initiation of power-saving mode
    • G06F1/3234Power saving characterised by the action undertaken
    • G06F1/3293Power saving characterised by the action undertaken by switching to a less power-consuming processor, e.g. sub-CPU
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00Details not covered by groups G06F3/00 – G06F13/00 and G06F21/00
    • G06F1/26Power supply means, e.g. regulation thereof
    • G06F1/32Means for saving power
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00Details not covered by groups G06F3/00 – G06F13/00 and G06F21/00
    • G06F1/26Power supply means, e.g. regulation thereof
    • G06F1/32Means for saving power
    • G06F1/3203Power management, i.e. event-based initiation of power-saving mode
    • G06F1/3234Power saving characterised by the action undertaken
    • G06F1/3296Power saving characterised by the action undertaken by lowering the supply or operating voltage
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/1563Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators without using an external clock
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D10/00Energy efficient computing
    • Y02D10/10Reducing energy consumption at the single machine level, e.g. processors, personal computers, peripherals or power supply
    • Y02D10/12Reducing energy consumption at the single machine level, e.g. processors, personal computers, peripherals or power supply acting upon the main processing unit
    • Y02D10/122Low-power processors
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D10/00Energy efficient computing
    • Y02D10/10Reducing energy consumption at the single machine level, e.g. processors, personal computers, peripherals or power supply
    • Y02D10/17Power management
    • Y02D10/172Controlling the supply voltage

Abstract

A method and device are described for controlling an individual voltage source (50) for an individual application circuitry (60) in such a way that the voltage source (50) provides a supply voltage (VDD2) which is optimal to the specific application circuitry (60). The supply voltage (VDD2) is set as low as possible while the application circuitry (60) still functions correctly. Control of the voltage source (50) includes a step of checking the correct functioning of the application circuitry (60); if so, the voltage source (50) is controlled to output a lower voltage, otherwise the voltage source (50) is controlled to output a higher voltage.

Description

Method and device for controlling a DC/DC converter.

The present invention relates in general to providing a power supply voltage, more particularly a DC voltage as power supply for an electronic circuitry, particularly as power supply for a portion of an integrated circuit.

Generally speaking, in battery-operated circuitry, such as for instance used in a mobile telephone, it is desirable that the energy consumption is as low as possible. For this reason, there is a tendency to design electronic circuitry, especially components of an integrated circuit, to operate at as low a voltage as possible. For instance, many of the components of an integrated circuit are able to operate with a supply voltage of 1.3 V. However, it may be that some of the components of an integrated circuit need a higher operating voltage, for instance 3 V, in order to operate correctly. For such circuitry, it is customary to provide a power source such as a battery for the lower supply voltage VDDI . and to derive the higher supply voltage VDD2 from the lower supply voltage VDDI by means of a converter such as a DC/DC converter. However, it is also known to provide a power source such as a battery for the higher supply voltage, and to derive the lower supply voltage from the higher supply voltage by means of a voltage converter such as a DC/DC converter or a linear regulator. Hereinafter, the invention will be further explained for an illustrative example where the higher supply voltage VDD2 is derived from the lower supply voltage VDDI by means of a DC/DC converter, but it will be understood that the invention is not limited to such embodiment. The supply voltage for electronic circuitry needs to have a certain minimum value Vmjn for the electronic circuitry to operate correctly. Such minimum value Vmjn can be considered as a design characteristic of the circuitry. If the supply voltage to such circuitry would be higher than the minimum supply voltage Vmjn, the circuitry would still operate correctly but with a less-than-optimum energy consumption. Therefore, it would be desirable if the output voltage V D2 of the voltage converter would be constant and equal to Vmjn.

However, in practice the output voltage of a voltage converter is not constant but is controlled to fluctuate in a control range between a lower limit VLOW and an upper limit VHIGH- Herein, the lower limit VLOW is chosen to be approximately equal to the minimum supply voltage Vmin, whereas the difference VHIGH - VLOW is considered as a control margin. Thus, the converter in principle requires two operational parameters, i.e. VHIGH and VLOW- In practice, VHIGH can be derived from VLOW by applying a fixed value ΔV = VHIGH - VLOW; then, a converter needs only one input parameter VLOW- Conventionally, the boundaries of the control range of a voltage converter are fixed. Then, in order to take into account possible manufacturing tolerances, VLOW should be chosen relatively high in comparison with Vmιn. This implies a relatively high energy consumption for most applications.

In order to overcome this problem, according to an important aspect of the present invention, a voltage converter is controllable in that it comprises a parameter input for receiving an input signal that indicates a suitable value for the lower limit VLOW of the control range of the DC/DC converter, while further the voltage converter is adapted to control its output voltage VDD2. derived from an input voltage V DI , to be at least equal to the lower limit VLOW as derived from the parameter signal received at said parameter input. Preferably, the parameter signal is a voltage level identical to VLOW-

In contrast to Vmιn, which is a design characteristic, VLOW is an operational parameter, which must be suitably set for achieving an acceptable balance between energy consumption and safety margin. If the value of VLOW would be chosen too high, the mean energy consumption of the integrated circuit would be undesirably high. On the other hand, if the value of VLOW would be lower than Vmιn, the supply voltage to the integrated circuit might drop below Vmm, in which case the integrated circuitry would operate incorrectly or not at all. A problem in this regard is that the exact, actual value of Vmιn depends on, inter alia, the process "history", i.e. the exact process conditions during manufacture of the voltage converter, so that the exact, actual value of Vmιn may differ from one individual voltage converter to another. Further, Vmιn is not constant but depends on, inter alia, the temperature of the integrated circuit. Therefore, it is desirable to have a parameter source for providing the control parameter VLOW for the voltage converter, which parameter source takes the above- mentioned dependency into consideration.

It is an objective of the present invention to provide such a parameter source. According to an important aspect the present invention, the lower boundary

VLOW of the control range of a voltage converter is adaptively controlled by a control unit which checks the correct functioning of an application device which receives the output voltage of the voltage converter as supply voltage. If the application device is functioning correctly, the lower boundary VLow of the control range of the voltage converter is lowered. If the application device is not functioning correctly any more, the lower boundary VLOW of the control range of the voltage converter is increased.

These and other aspects, characteristics and advantages of the present invention will be further clarified by the following description of a preferred embodiment of a control circuitry in accordance with the invention, with reference to the drawings, in which same reference numerals indicate equal or similar parts, and in which: Fig. 1 schematically shows a functional block diagram of a parameter source;

Fig. 2 schematically shows a flow diagram illustrating the operation of a parameter source in accordance with the invention; and Fig. 3 shows schematically the conversion behaviour of a voltage converter. Fig. 1 shows schematically a functional block diagram of a power supply voltage generator 1 in accordance with the present invention, which is designed for supplying a supply voltage VDD2 to chip circuitry 60. This chip circuitry 60 may for instance be circuitry in a mobile phone application, or any other type of electronic equipment where minimum power supply drain is of utmost importance. More particularly, the supply voltage VDD2 for the electronic chip circuitry 60 needs to have a certain minimum value Vmjn for the electronic chip circuitry 60 to operate correctly. On the other hand, for low energy consumption, the supply voltage VDD2 should be as low as possible. Therefore, the power supply voltage generator 1 is designed to generate the supply voltage VDD2 in such a way, that these needs are met, as will be explained more elaborately. The power supply voltage generator 1 comprises a voltage converter 50, which in the illustrated embodiment is a DC/DC converter. The voltage converter 50 has a primary voltage input 51 for receiving a first supply voltage VDDI .r instance from a power supply such as a battery (not shown). The voltage converter 50 further has a secondary voltage output 52 for delivering a second supply voltage VDD2- In principle, the voltage converter can be any type of known voltage converter, of a type wherein the output voltage level is controlled to fluctuate in a control range between a lower limit VLOW and an upper limit VHIGH. as illustrated in Fig. 3. Therefore, the construction and operation of a voltage converter will not be explained here in more detail. However, in contrast to conventional voltage converters where the lower limit VLOW i a fixed value, the voltage converter 50 according to the present invention comprises a parameter input 53 for receiving an input parameter control signal that indicates a suitable value for the lower limit VLOW of the control range of the converter, while further the voltage converter 50 is adapted to control its output voltage VDD2» derived from the input voltage VDDI . to be at least equal to the lower limit VLOW as derived from the parameter signal received at said parameter input.

The power supply voltage generator 1 further comprises a voltage parameter source circuitry 3 for generating the control parameter signal VLOW. having an output 2 connected to the parameter input 53 of the voltage converter 50.

In the preferred embodiment of Fig. 1, the parameter signal is a voltage level identical to VLOW-

The voltage parameter source circuitry 3 comprises a controllable D/A converter 70 which generates the control parameter signal VLOW- The controllable D/A converter has a reference signal input 71 for receiving a reference voltage Vref, Vref can be equal to VDDI °r can be supplied by a reference source 72 that receives VDDI as an input voltage. The D/A converter 70 further has a control input 73 for receiving a control signal φc from a control unit 100. The control unit 100 may be a suitably programmed microcontroller or the like. Further, the control unit 100, the D/A converter 70 and the eventual reference source 72 may be formed integrally as one single unit.

The control unit 100 is adapted to find the optimum value for VLOW by a trial- and-error algorithm, which will be explained in more detail with reference to Fig. 2. Initially, as indicated with step 11 1 , the control unit 100 will output a control signal φc such that the D/A converter 70 will output the highest possible value for VLOW- Normally, this highest possible value for VLOW will be equal to the reference voltage Vref. The DC/DC converter 50 will then operate on the basis of this input parameter VLOW having a high value, and will output a second supply voltage VDD2 ith a relatively high value to the application circuitry 60.

The control unit 100 is arranged to execute a checking cycle 120 for checking the correct functioning of the application circuitry 60. The checking of the correct functioning of the application circuitry 60 may be executed by having the application circuitry 60 perform one of its tasks, preferably the most critical task which is most sensitive to supply voltage. In the following, the present invention will be explained specifically for a situation where a critical task of the application circuitry 60 is access to an internal RAM memory. For a person skilled in the art, it will be clear how the present invention is to be implemented in case the most critical task for an application circuitry 60 involves a different operation, or in any case where it is desired to use another task of the application circuitry 60 as checking task.

In a first step 121 of the checking cycle 120, the control unit 100 writes a control word in a RAM memory of the application circuitry 60. This control word can be a specified, predetermined value, or a random value. In a second step 122, the control unit 100 reads the memory location in the

RAM memory of the application circuitry 60 where the control word was written. Then, the control unit 100 compares (step 130) the word as read from the RAM memory of the application circuitry 60 with the word as written during the first step 121. If the operation of the application circuitry 60 is correct, both values will be equal. If the control unit 100 finds the operation of the application circuitry 60 to be correct, it proceeds to a step 141 of amending the control signal φc such that the output voltage VLOW of the D/A converter 70 is decreased by a small amount ΔVj. The control unit 100 may proceed to this cycle 141 immediately after one checking cycle 120 shows a correctly functioning application circuitry 60. However, it is also possible that the control unit 100 proceeds to this cycle only after a predetermined number of checking cycles 120. Further, the control unit 100 may perform a waiting cycle of a predetermined waiting time after each checking cycle 120.

Then, with this decreased value of VLOW as input parameter signal to the DC/DC converter 50, the control unit 100 returns to the first step 121 of the checking cycle 120 and checks again the correct functioning of the application circuitry 60.

The above steps 121, 122, 130, 141 are repeated as long as the application circuitry 60 is found to function satisfactorily, and each time the input parameter signal VLOW for the DC/DC converter 50 will be decreased by a small step ΔVd. Eventually, the second supply voltage VDD2 ill become low to such extent, that the application circuitry 60 will fail to function properly.

If, in step 130, the control unit 100 detects an improper functioning of the application circuitry 60, the control unit 100 proceeds to a step 142 for amending the control signal φc such that the output VLOW of the D/A converter 70 is increased by a certain amount ΔVj. In principle, ΔVj may be equal to ΔVd such that the input parameter signal VLow f°r the DC/DC converter 50 is brought back to the previous value where operation of the application circuitry 60 was found to be correct, but preferably a safety margin is introduced to guarantee proper operation, for which reason ΔV; preferably is larger than ΔVd. In principle, VLow i no set at an optimal value for this individual DC/DC converter 50, and the control unit 100 may proceed to an end of the checking cycle 120. However, in order to take into account that the exact, actual value of Vmm may vary with time, such that the setting of VLOW should be adapted to the momentary value of Vmm in order to be optimal again, the control unit 100 may again proceed to the first step 121 of the checking cycle 120. In this respect, it is not necessary for the control unit 100 to perform the checking cycle 120 continuously. After step 142, the control unit 100 may wait (step 143) for a predetermined amount of time before returning to step 121. Also, the checking cycle 120 may be implemented as a task of normal control operation to be performed on a regular basis, comparable to other control tasks executed by the control unit 100, like control of other devices, interrupt handling, adjustment of critical system frequencies, etc.

Although it is not necessary for embodying the principles of the present invention, the DC/DC converter 50, the D/A converter 70, the control unit 100, and the application circuitry 60 are preferably implemented in one single chip.

In a preferred embodiment, the control unit 100 receives VDD2 as input supply voltage. To this end, the control unit 100 is preferably designed to be less critical than the application circuitry 60 regarding the supply voltage; in other words: preferably the minimum supply voltage Vmιn(100) of the control unit 100 is lower than the minimum supply voltage Vmjn(60) of the application circuitry 60. If such can not be assured, the control unit 100 may receive VDDI as input supply voltage. It should be clear to a person skilled in the art that the scope of the present invention is not limited to the examples discussed in the above, but that several amendments and modifications are possible without departing from the scope of the invention as defined in the appending claims.

For instance, during the checking cycle, the number of control words written and read may be more than one.

Further, although the present invention is explained for a situation where the second supply voltage VDD2 f°r the application circuitry 60 is generated by a DC/DC converter, the present invention is also applicable in a situation where the second supply voltage VDD2 f°r the application circuitry 60 is generated by a DC voltage source of any suitable type, designed to generate an output voltage VDD2 within a control range between VLOW and VHIGH-

Claims

CLAIMS:
1. Method of providing a supply voltage (VDD2) for an application circuitry (60), comprising the steps of: a) initially generating the supply voltage (VDD2) at a relatively high level, and feeding this supply voltage (VDD2) to the application circuitry (60); b) checking the correct functioning of the application circuitry (60); c) in case the check of step (b) reveals that the application circuitry (60) functions correctly, decreasing the level of the supply voltage (VDD2) and returning to step (b), otherwise increasing the level of the supply voltage (VDD2)-
2. Method of providing a supply voltage (VDD2) f r an application circuitry (60), comprising the steps of: a) initially generating the supply voltage (VDD2) within a control range with a relatively high lower limit (VLOW), and feeding this supply voltage (VDD2) to the application circuitry (60); b) checking the correct functioning of the application circuitry (60); c) in case the check of step (b) reveals that the application circuitry (60) functions correctly, decreasing the level of the lower limit (VLOW) of the control range with an amount ΔVj and returning to step (b), otherwise increasing the level of the lower limit (VLOW) of the control range with an amount ΔV;, ΔVj preferably being larger than ΔVd.
3. Voltage source or voltage converter (50), for instance a DC/DC converter, with a primary voltage input (51) for receiving a first supply voltage (VDDI), and a secondary voltage output (52) for delivering a second supply voltage (VDD2); the voltage converter (50) being arranged to control the output voltage level of its output voltage (VDD2) to fluctuate in a control range between a lower limit (VLOW) and an upper limit (VHIGH); the voltage converter (50) further comprising a parameter input (53) for receiving an input parameter control signal that indicates a suitable value for said lower limit (VLOW) of the control range of the converter.
4. Power supply voltage generator (1) for providing a second supply voltage
(VDD2) f°r an electronic circuitry (60), comprising: a controllable voltage source or voltage converter (50) according to claim 3; - a voltage parameter source circuitry (3) for generating a voltage parameter signal (VLOW) which is substantially equal to the minimum supply voltage value (Vmιn) of the electronic circuitry (60); wherein the voltage parameter source circuitry (3) has an output (2) coupled to the parameter input (53) of the voltage converter (50).
5. Power supply voltage generator according to claim 4, wherein the voltage parameter source circuitry (3) comprises a control unit (100) adapted to check the correct functioning of the application circuitry (60), and adapted to amend said control parameter signal (VLOW) in response of the result of said check.
6. Power supply voltage generator according to claim 5, wherein the voltage parameter source circuitry (3) comprises a D/A converter (70) having a reference signal input (71) for receiving a reference voltage (Vref), a control input (73) coupled to the control unit (100) for receiving a control signal (φc), and an output (2) coupled to the parameter input (53) of the controllable voltage source (50).
7. Power supply voltage generator according to claim 5 or 6, wherein the control unit (100) is adapted to check the correct functioning of the application circuitry (60) by having the application circuitry (60) perform one of its tasks, preferably the most critical task which is most sensitive to supply voltage (V D2)-
8. Power supply voltage generator according to any of claims 5-7, wherein the control unit (100) is adapted to check the correct functioning of the application circuitry (60) by writing a control word in a predetermined RAM memory location of the application circuitry (60), subsequently reading said memory location, and comparing the control word as read with the control word as written.
9. Power supply voltage generator according to any of claims 5-8, wherein the control unit (100) is adapted to control, directly or indirectly, the control parameter signal (VLOW) for the parameter input of the controllable voltage source (50) in such a way, that said control parameter signal (VLOW) is decreased with a predetermined amount ΔVd if said checking operation reveals that the application circuitry (60) functions correctly, while said control parameter signal (VLOW) is increased with a predetermined amount ΔVj if said checking operation reveals that the application circuitry (60) does not function correctly, ΔVj preferably being larger than ΔVd.
10. Apparatus, comprising an application circuitry (60) and a power supply voltage generator according to any one of the previous claims for generating a power supply (VDD2) for the application circuitry (60), wherein the application circuitry (60) has a power supply input coupled to the secondary voltage output (52) of the voltage source (50) for receiving power supply voltage (VDD2)-
1 1. Apparatus according to claim 10, wherein the application circuitry (60), the voltage source (50), and the control unit (100) are implemented in one single chip.
PCT/EP2000/009945 1999-10-28 2000-10-09 Method and device for controlling a dc/dc converter WO2001031423A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP99203550.1 1999-10-28
EP99203550 1999-10-28

Publications (1)

Publication Number Publication Date
WO2001031423A1 true WO2001031423A1 (en) 2001-05-03

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PCT/EP2000/009945 WO2001031423A1 (en) 1999-10-28 2000-10-09 Method and device for controlling a dc/dc converter

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5153535A (en) * 1989-06-30 1992-10-06 Poget Computer Corporation Power supply and oscillator for a computer system providing automatic selection of supply voltage and frequency
US5627412A (en) * 1994-11-07 1997-05-06 Norand Corporation Dynamically switchable power supply
JPH11203163A (en) * 1998-01-14 1999-07-30 Matsushita Electric Ind Co Ltd Information processor and its applied-voltage control method
US5955871A (en) * 1998-10-14 1999-09-21 Intel Corporation Voltage regulator that bases control on a state of a power conservation mode

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5153535A (en) * 1989-06-30 1992-10-06 Poget Computer Corporation Power supply and oscillator for a computer system providing automatic selection of supply voltage and frequency
US5627412A (en) * 1994-11-07 1997-05-06 Norand Corporation Dynamically switchable power supply
JPH11203163A (en) * 1998-01-14 1999-07-30 Matsushita Electric Ind Co Ltd Information processor and its applied-voltage control method
US5955871A (en) * 1998-10-14 1999-09-21 Intel Corporation Voltage regulator that bases control on a state of a power conservation mode

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 12 29 October 1999 (1999-10-29) *

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