GB2341247A - AC adapter and power supply system - Google Patents
AC adapter and power supply system Download PDFInfo
- Publication number
- GB2341247A GB2341247A GB9909304A GB9909304A GB2341247A GB 2341247 A GB2341247 A GB 2341247A GB 9909304 A GB9909304 A GB 9909304A GB 9909304 A GB9909304 A GB 9909304A GB 2341247 A GB2341247 A GB 2341247A
- Authority
- GB
- United Kingdom
- Prior art keywords
- adapter
- control circuit
- electronic device
- voltage
- output
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/20—Cooling means
- G06F1/206—Cooling means comprising thermal management
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/263—Arrangements for using multiple switchable power supplies, e.g. battery and AC
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Human Computer Interaction (AREA)
- Rectifiers (AREA)
- Power Sources (AREA)
- Control Of Electrical Variables (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
An AC adapter 1 for supplying a direct-current voltage to a main body of a personal computer 2 through an output line 3 is connected with the PC main body by a bus 4 capable of bidirectionally transferring data signals. The AC adapter includes an output conversion unit 5 for converting an alternating-current supply voltage to a direct-current voltage, an output regulating unit 6 for regulating the converted direct-current voltage to a predetermined voltage required by the PC main body, and an AC adapter microcomputer 7 for controlling the current or voltage of the AC adapter. A state monitor 19, responsive to temperature or voltage or current, provides a signal for controlling the adapter 1 or the PC 2, which may include removing the output on line 3 in the event of overheating.
Description
2341247 AC ADAPTER AND POWER SUPPLY SYSTEM The present invention relates
to AC adapters for supplying power to electronic devices operating with a direct current power supply, and more particularly to an AC adapter having a bus interface and capable of controlling an output.
AC adapters are commonly used to convert an alternating-current voltage from a power supply into a direct-current voltage and supplying a prescribed direct-current voltage to electronic devices operating with a direct-current voltage.
Basically, an AC adapter includes a transformer for reducing a voltage, a rectifier for converting alternating current into ripple current, and a smoother f or converting ripple current into direct current. Some adapters also include a stabilizer circuit for stabilizing an output voltage.
A conventional AC adapter is connected with an electronic device such as a personal computer only with positive and negative output lines to supply the electric power. The AC adapter supplies a,- voltage prescribed for that electronic device. For example, the voltage supply to a common personal computer is a relatively high voltage (15 V) for charging a battery attached to the personal computer, while the voltage required to operate the computer itself is a relatively low voltage (5 V). Therefore, the direct-current voltage of 15 V supplied f rom the AC adapter is converted for operation of the computer by a DC/DC converter in the computer into the low operating voltage (5 V). In addition, as the required voltage/current varies with the type and size 2 of an electronic device, a variety of AC adapters are employed in a variety of electronic devices.
Conventionally, the output voltage and the like of AC adapters are not controlled by electronic devices. When operating a personal computer by supplying power from the AC adapter, a great difference is generated between input and output voltages of the DC/DC converter, lowering conversion efficiency and generating undesirable heat in the personal computer.
If the output voltage can be controlled for each electronic device, the same AC adapter can be employed by electronic devices with varying size and output voltages.
Further, as electronic devices become increasingly smaller and more portable, they are subject to restrictions on circuit space. AC adapters used for electronic devices fixed indoors are less subject to such space restrictions.
Therefore, an object of the present invention is to reduce power consumption of electronic devices and to implement an AC adapter that can be widely used by a variety of devices by controlling the output voltage and the like of the AC adapter in the electronic device or in the AC adapter.
In order to achieve the above object, an AC adapter according to a first aspect of the present invention supplies direct current to an electronic device through an output line, and includes an output conversion unit for converting an alternating- current voltage from a power supply into a direct-current voltage, an output regulating unit for regulating the converted direct-current voltage and providing the regulated voltage to the electronic device, an AC adapter control circuit 3 for controlling the output regulating unit, and a bus for communicating a signal between the AC adapter control circuit and a host control circuit of the electronic device when the AC adapter is connected with the electronic device.
The AC adapter control circuit may control the output regulating unit in accordance with an instruction signal transferred from the host control circuit of the electronic device along the bus.
The AC adapter may further comprise an AC adapter monitoring unit for monitoring the state of the AC adapter and transmitting a state signal indicating this state to the AC adapter control circuit the AC adapter control circuit controlling the output regulating unit in accordance with the state signal.
Further, the AC adapter control circuit may transfer the state signal to the host control circuit of the electronic device.
The state signal may be a temperature monitoring signal of the AC adapter or an AC adapter attribute signal.
Further, a power supply system according to another aspect of the invention includes an electronic device and an AC adapter for providing direct current to the electronic device, in which 4 the electronic device includes a host control circuit for controlling the state of the electronic device, and the AC adapter includes an output conversion unit for converting an alternating-current voltage from a power supply into a direct-current voltage, an output regulating unit for regulating the converted direct-current voltage and providing the regulated voltage to the electronic device, an AC adapter control circuit for controlling the output regulating unit, a bus for communicating a signal between the AC adapter control circuit and the host control circuit of the electronic device when the AC adapter and the electronic device are connected, and an AC adapter monitoring unit f or monitoring the state of the AC adapter and transmitting a state signal indicating this state to the host control circuit via the AC adapter control circuit, the host control circuit controlling the electronic device in accordance with the state signal.
The device according to the present invention makes it possible to control an output and the like of an AC adapter in the electronic device or the AC adapter by connecting a control circuit in the AC adapter and a host control circuit of the electronic device with a bus capable of bidirectionally transferring data signals.
In addition, the output control of the AC adapter can be adapted to the output current/voltage required by each electronic device, so that the AC adapter can be widely used by a variety of devices.
The invention will be further described by way of non-limitative example with reference to the accompanying drawings, in which:- Fig. 1 is a schematic diagram of an AC adapter device connected to a personal computer according to an embodiment of the present invention. Fig. 2 is a flowchart outlining control procedures for varying an output voltage of the AC adapter in accordance with the charge/non-charge state of the personal computer. 5 Fig. 3 is a flowchart outlining control procedures for varying an output voltage of the AC adapter in accordance with a state signal of the AC adapt er. Fig. 4 is a flowchart outlining control procedures for operating the personal computer in accordance with the state signal of the AC adapter.
Preferred embodiments of the present invention are described below.
Embodiment 1 Fig. 1 shows a configuration of an AC adapter connected to a main body of a personal computer (hereinafter referred to as a PC main body), and of a power supply system including the AC adapter and the PC main body according to an embodiment of the present invention.
The power supply system includes an AC adapter 1 and a PC main body 2, which are connected by an output line 3 and a bus 4. More specifically, the output line 3 and the bus 4 are contained in a cable of the AC adapter 1. By connecting this cable with a connector of the PC main body 2, the output line 3 is connected to a power supply circuit of the PC main body 2, and the bus 4 to a control bus in the PC main body 2. A direct-current voltage is provided from the AC adapter 1 to the PC main body 2 along the output line 3. An interface signal for the AC adapter 1 and PC main body 2 is transmitted in a serial or parallel manner 6 along the bus 4.
The AC adapter 1 includes an output conversion unit 5 for converting an alternating-current voltage (100 V) from a power supply to a directcurrent voltage, an output regulating unit 6 for receiving the voltage output from the output conversion unit 5 and providing a fixed voltage, and an AC adapter microcomputer (AliC) 7 f or controlling the output regulating unit 6. The A,uC 7 is connected to the bus 4 contained in the cable.
In the output conversion unit 5, an alternating-current voltage is transformed, rectified, and smoothed, before being converted into a direct-current voltage. The output regulating unit 6 compares the voltage output from the output conversion unit 5 with a reference voltage of a power supply 9 provided in the AC adapter by a comparator 10, and regulates the voltage by feedback control, to thereby fixing the output voltage. In the present embodiment, the output voltage regulation is performed by employing a variable resistor 8 to reduce the voltage. Further, according to this embodiment, a control signal 11 is supplied from the AMC 7 to the variable resistor 8 to control the voltage in accordance with the control signal 11.
The PC main body 2 includes a battery 12 for supplying electric power when the AC adapter 1 is not used, a charger 13 for charging the battery 12, a DC/DC converter 14 for converting the direct-current voltage provided to the PC main body 2 into a voltage required by load devices, such as internal discs and display devices, contained in the PC main body 2, and a host microcomputer (H1AC) 15 for controlling the PC main body 2. The 7 HzC 15 is connected to the control bus 4 of the PC main body 2. The HliC 15 operates with the output 3 supplied from the AC adapter 1 or an output 17 from the battery 12. A signal 18 for switching on or off the charger 13 is transmitted from the 5 HMC 15 to the charger 13.
Fig. 2 is a control chart used during charg ing /operation of the PC main body 2 according to this embodiment. Operation of the AC adapter 1 will be described below with reference to this chart.
When the cable of the AC adapter 1 is connected to the connector of the PC main body 2 (S 101), an alternating-current voltage (100 V) supplied from the power supply is converted to a direct-current voltage by the AC adapter 1, and a prescribed initial voltage VO is provided to the PC main body 2. This initial voltage can be a charging voltage (V.) necessary for charging the battery in the PC main body 2.
The HUC 15 in the PC main body 2 checks the charging state of the battery 12 to determine whether or not charging is necessary (S 102). When the battery power is drained to a predetermined level, the HuC 15 determines that charging is necessary and transmits, along the bus 4, an instruction signal for directing the AliC 7 to cause an output of the charging voltage V. (S 103). Receiving the signal along the bus 4, the AliC 7 provides the control signal 11 to the output regulating unit 6, to thereby change the output voltage from V. to V. (S 104). This voltage change can be achieved by making a change in the variable resistor 8 by the control signal 11.
The changed output voltage is transmitted to the PC main body 2 through the output line 3, whereby the charger 13 starts 8 charging the battery 12 (S 105). When charging is completed (S 106), the HuC 15 monitoring the charging state transmits the signal 18 for switching off the charger 13 to end charging (S 107).
When charging is completed, or when it is determined at S 102 that charging is not necessary, the HMC 15 transmits an instruction signal for causing an output of an operation voltage (V,) required by the load device in the PC main body 2 to the AMC 7 along the bus 4 (S 108). The voltage applied to the PC main body 2 is varied depending on whether or not the battery is being charged because the greatest conversion efficiency is obtained with the smallest difference between input and output voltages during conversion by the DC/DC converter 14 to thereby suppress generation of heat at the PC main body 2. once the A i- C 7 receives the signal from the bus 4, it transmits the control signal 11 to the output regulating unit 6 to change the output voltage from V. to V, (S 109). The altered output voltage VL is provided to the PC main body 2 through the output line 3.
Thus, the AliC 7 and the HMC 15 provided in the AC adapter and the electronic device, respectively, are connected through the bus 4, and the electronic device transmits an instruction signal for controlling the AC adapter in accordance with the utilized condition of the electronic device, so that the output of the AC adapter can be controlled by the electronic device.
Embodiment 2 According to a second embodiment of the present invention, the Aa C 7 in the AC adapter 1 is provided with AC adapter monitoring means for transmitting a state signal indicating the 9 state of the AC adapter 1. The AC adapter monitoring means are f ormed by, f or example, a temperature sensor, a voltage or current sensor for the AC adapter output, or a sensor for a voltage supplied from the power supply (100 V). 5 Fig. 3 is a flowchart illustrating how the AJAC 7 controls the output voltage based on the state signal. The output control performed by the AC adapter 1 itself will be described with reference to this flowchart. The PC main body 2 is currently in charging operation, and the AC adapter 1 is supplying the voltage V. (S 111). Atemperature sensor 19 provided at a predetermined position of the AC adapter 1 continuously transmits a temperature signal to the AliC 7 as the state signal. The A Ii C 7 monitors whether or not the temperature of the AC adapter 1 stands at a normal value (S 112).
When the AC adapter 1 is heated to indicate an abnormal temperature such as over 50 OC, the AMC 7 provides the output regulating unit 6 with a signal for stopping the output to the PC main body 2 (S 113). It should be noted that this control can be performed by altering the voltage as in the first embodiment or altering the current, rather than such ONIOFF control. During such control operation, the temperature signal is continuously supplied to the AUC 7, and, when the temperature of the AC adapter 1 returns to a normal value (S 114), the AliC 7 gives an instruction to resume the output (S 115) or change the output voltage and current back to the original values.
As described above, the AC adapter includes monitoring means f or monitoring its own state and, if the monitoring means determines that the AC adapter is in an abnormal state, it inf orms the AuC 7 of that state, which then controls the output voltage or the like. Thus, the abnormal state of the AC adapter can be detected by the temperature sensor 19 and the AaC 7, and failure can be prevented beforehand even if, for example, the power supply of the electronic device is switched off and the microcomputer contained in the device is not operating.
Embodiment 3 According to a third embodiment of the present invention, the above- described state signal is also transmitted to the PC main body 2 along the bus 4, and the HliC 15 controls operation of the PC main body 2 in accordance with the state of the AC adapter 1.
Fig. 4 is a flowchart outlining the procedure by which the H11C 15 controls operation of the PC main body 2 in accordance with the state signal.
When the PC main body 2 is not in charging operation and the AC adapter 1 outputs a voltage of V, (S 121), the state signal is continuously supplied from the temperature sensor 19 not only to the AMC 7 but to the HaC 15 along the bus 4. The supplied temperature signal may be presented on a display device connected to the personal computer as the temperature of the AC adapter. The HaC 15 monitors whether or not the temperature of the AC adapter 1 stands at a normal value (S 122). If the AC adapter 1 is heated to show an abnormal temperature, the HMC 15 makes a change so that the load device in the PC main body 2 operates in a power saving mode (S 123). Operation in the power saving mode includes a temporary reduction in luminance of the display screen and a stop in rotation of the internal disk. By thus operating the load device in the power saving mode, the output current of the AC adapter 1 can be decreased.
When the amount of heat generated in the AC adapter 1 is reduced by this decrease of the output current and the temperature stands again at a normal value, the H/IC 15 determines that the temperature is normal using the temperature signal (S 124), altering the operation mode from the power saving mode to the normal mode (S 125).
The state signal of the AC adapter 1 is thus transmitted to the electronic device by the bus interface, making it possible to control the load in the electronic device and, therefore, the temperature of the AC adapter 1 without causing a halt in supply of power to the electronic device. Consequently, the AC adapter 1 can be prevented from becoming too hot and causing a fault.
The state signals of the AC adapter 1 transmitted to the HuC 15 further include signals indicating attributes of the AC adapter 1 such as its type and manufactured date. Receiving this attribute signal, the HUC 15 can present this information on the display device. Such attribute information is utilized for repairing and recovering the AC adapter 1.
Embodiment A A fourth embodiment of the present invention relates to situations where the electronic devices to be connected vary in type and size. The HliC 15 according to this embodiment can transmit information on voltage and current of the PC main body 2 necessary for operation and charging of the main body 2 to the AI-tC 7 through the bus 4.
Thus, since the AliC 7 can convert the output voltage of the AC adapter 1 in accordance with an information signal from 12 the PC main body 2 indicating the voltage and the like, the AC adapter 1 can be used by a plurality of personal computers regardless of the difference in operation voltage of the personal computers generated from the difference in size of the PC main bodies 2. Consequently, the AC adapter 1 can be widely used for various devices.
Further, in this device the AgC 7 controls the output voltage and current of the AC adapter based on the instruction on voltage and current given by the PC main body 2. Therefore, setting beforehand such factors as the upper limit of the current f lowing when the AC adapter I and the PC main body 2 are connected can prevent excessive current from flowing through the small-output personal computer connected to the AC adapter 1, and therefore from damage on the internal circuit of the personal computer.
The electronic devices connected to the AC adapter are not limited to personal computers but may include any electronic devices operating with a direct-current voltage. The AC adapter is controlled in accordance with the information signal indicating information such as a voltage supplied from a microcomputer contained in the electronic devices. Also, although the AuC 7 is described above as controlling the output regulating unit according to the voltage, it can also control the unit based on current so that a f ixed current will f low. More specifically, as the formula V = IR shows, the voltage V can be regulated by changing the resistance R when the current I is f ixed, and the current I can be adjusted by changing the resistance R with the f ixed voltage V. In addition to the voltage control, current control is also possible.
13
Claims (9)
1 An AC adapter f or supplying direct current to an electronic device through an output line, comprising:
an output conversion unit for converting an alternating-current voltage from a power supply to a direct current voltage; an output regulating unit for regulating the converted direct-current voltage and providing the regulated voltage to the electronic device; and an AC adapter control circuit for controlling said output regulating unit, wherein said AC adapter control circuit and a host control circuit of said electronic device are connectable by a bus.
2. The AC adapter according to claim 1, wherein said AC adapter control circuit controls said output regulating unit in accordance with an instruction signal transferred from the host control circuit of said electronic device along the bus.
3. The AC adapter according to claim 1 or claim 2, further comprising an AC adapter monitoring unit f or monitoring the state of said AC adapter and transmitting a state signal indicating said state to said AC adapter control circuit, wherein said AC adapter control circuit controls said output regulating unit in accordance with the state signal.
4. The AC adapter according to claim 3, wherein said AC adapter control circuit transfers the state signal to the host 14 control circuit of said electronic device.
5. The AC adapter according to claim 3 or claim 4, wherein the state signal is a temperature monitoring signal of said AC 5 adapter.
6. The AC adapter according to claim 3 or claim 4, wherein the state signal is an AC adapter attribute signal.
7. A power supply system comprising an electronic device and an AC adapter for providing direct current to said electronic device, said electronic device including a host control circuit for controlling the state of said electronic device, said AC adapter including an output conversion unit for converting an alternating-current voltage from a power supply to a direct current voltage, an output regulating unit for regulating the converted direct-current voltage and providing the regulated voltage to said electronic device, an AC adapter control circuit for controlling said output regulating unit, a bus for communicating a signal between said AC adapter control circuit and the host control circuit of said electronic device when said AC adapter and said electronic device are connected, and an AC adapter monitoring unit for monitoring the state of said AC adapter and transmitting a state signal indicating said state to the host control circuit via said AC adapter control circuit, wherein said host control circuit controls said electronic device in accordance with said state signal.
8. An AC adapter constructed and arranged to operate substantially as hereiribefore described with reference to and as illustrated in the accompanying drawings.
9. A power supply system constructed and arranged to operate substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10247344A JP2000078849A (en) | 1998-09-01 | 1998-09-01 | Ac adaptor and power supply system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9909304D0 GB9909304D0 (en) | 1999-06-16 |
| GB2341247A true GB2341247A (en) | 2000-03-08 |
Family
ID=17162023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9909304A Withdrawn GB2341247A (en) | 1998-09-01 | 1999-04-22 | AC adapter and power supply system |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2000078849A (en) |
| GB (1) | GB2341247A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003029944A2 (en) * | 2001-09-27 | 2003-04-10 | Fritschle, Simone | Computer power supply unit |
| GB2381883A (en) * | 2002-05-24 | 2003-05-14 | Sendo Int Ltd | Electronic device and USB circuit with voltage regulator |
| WO2006023240A1 (en) * | 2004-08-19 | 2006-03-02 | Intel Corporation | Power delivery system |
| WO2006130877A2 (en) * | 2005-06-02 | 2006-12-07 | Intel Corporation | Power supply for portable computer |
| WO2006083985A3 (en) * | 2005-02-01 | 2007-03-01 | Hewlett Packard Development Co | Systems and methods for controlling use of power in a computer system |
| EP2387298A1 (en) * | 2010-05-13 | 2011-11-16 | Research In Motion Limited | Selecting a power path based on temperature |
| US8836287B2 (en) | 2011-05-03 | 2014-09-16 | Apple Inc. | Time-domain multiplexing of power and data |
| US8954761B2 (en) | 2008-12-18 | 2015-02-10 | Fujitsu Limited | Method and system of controlling power supply of an information processing device including load information |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4708996B2 (en) * | 2005-12-20 | 2011-06-22 | アラクサラネットワークス株式会社 | Communication device |
| JP4800808B2 (en) * | 2006-03-24 | 2011-10-26 | 富士通セミコンダクター株式会社 | Electronic device, system power supply, and voltage supply method |
| CN101765964A (en) * | 2007-07-30 | 2010-06-30 | 京瓷株式会社 | Power conversion device and method for manufacturing the same |
| JP6121188B2 (en) * | 2013-02-14 | 2017-04-26 | 株式会社ダイヘン | Charging cradle |
| CN104283416B (en) * | 2013-07-05 | 2017-02-08 | 汕头市易普联科技有限公司 | Self-adaptation power supply system and power supply method thereof |
| KR20150111813A (en) | 2014-03-26 | 2015-10-06 | 이지세이버 주식회사 | Apparatus for controlling operation of electronic device |
| JP6991039B2 (en) * | 2017-11-10 | 2022-01-12 | 三菱電機株式会社 | Power supply and control system |
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|---|---|---|---|---|
| JPH05168149A (en) * | 1991-12-16 | 1993-07-02 | Nec Home Electron Ltd | Information processor provided with ac adapter |
| US5691870A (en) * | 1995-11-07 | 1997-11-25 | Compaq Computer Corporation | Circuit for monitoring and disabling power supply signals to a microprocessor in a computer system utilizing secondary voltage regulators |
| GB2318654A (en) * | 1996-10-21 | 1998-04-29 | Abit Computer Corp | Programmably converting an operating voltage of a CPU and chipset |
-
1998
- 1998-09-01 JP JP10247344A patent/JP2000078849A/en active Pending
-
1999
- 1999-04-22 GB GB9909304A patent/GB2341247A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05168149A (en) * | 1991-12-16 | 1993-07-02 | Nec Home Electron Ltd | Information processor provided with ac adapter |
| US5691870A (en) * | 1995-11-07 | 1997-11-25 | Compaq Computer Corporation | Circuit for monitoring and disabling power supply signals to a microprocessor in a computer system utilizing secondary voltage regulators |
| GB2318654A (en) * | 1996-10-21 | 1998-04-29 | Abit Computer Corp | Programmably converting an operating voltage of a CPU and chipset |
Non-Patent Citations (1)
| Title |
|---|
| Patent Abstracts of Japan, vol.17 no.578 (E-1450) 20 October 1993, & JP-A-05168149 * |
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003029944A3 (en) * | 2001-09-27 | 2004-01-08 | Fritschle Simone | Computer power supply unit |
| WO2003029944A2 (en) * | 2001-09-27 | 2003-04-10 | Fritschle, Simone | Computer power supply unit |
| GB2381883A (en) * | 2002-05-24 | 2003-05-14 | Sendo Int Ltd | Electronic device and USB circuit with voltage regulator |
| GB2381883B (en) * | 2002-05-24 | 2003-10-15 | Sendo Int Ltd | Electronic device and USB circuit arrangement |
| GB2429856B (en) * | 2004-08-19 | 2008-03-12 | Intel Corp | Power Delivery System |
| WO2006023240A1 (en) * | 2004-08-19 | 2006-03-02 | Intel Corporation | Power delivery system |
| US8694816B2 (en) | 2004-08-19 | 2014-04-08 | Intel Corporation | Power delivery system in which VRM and CPU exchange power consumption measurements |
| GB2429856A (en) * | 2004-08-19 | 2007-03-07 | Intel Corp | Power Delivery System |
| US7523337B2 (en) | 2004-08-19 | 2009-04-21 | Intel Corporation | Power delivery system in which power supply and load exchange power consumption measurements via digital bus |
| CN101111816B (en) * | 2005-02-01 | 2010-05-19 | 惠普开发有限公司 | Systems and methods for controlling use of power in a computer system |
| US7526659B2 (en) | 2005-02-01 | 2009-04-28 | Hewlett-Packard Development Company, L.P. | Systems and methods for controlling use of power in a computer system |
| WO2006083985A3 (en) * | 2005-02-01 | 2007-03-01 | Hewlett Packard Development Co | Systems and methods for controlling use of power in a computer system |
| US8103885B2 (en) | 2005-02-01 | 2012-01-24 | Hewlett-Packard Development Company, L.P. | Systems and methods for controlling use of power in a computer system |
| US8276006B2 (en) | 2005-02-01 | 2012-09-25 | Hewlett-Packard Development Company, L.P. | System and method for controlling use of power in a computer system |
| TWI407287B (en) * | 2005-02-01 | 2013-09-01 | Hewlett Packard Development Co | Systems and methods for controlling use of power in a computer system |
| WO2006130877A3 (en) * | 2005-06-02 | 2007-06-28 | Intel Corp | Power supply for portable computer |
| WO2006130877A2 (en) * | 2005-06-02 | 2006-12-07 | Intel Corporation | Power supply for portable computer |
| US8954761B2 (en) | 2008-12-18 | 2015-02-10 | Fujitsu Limited | Method and system of controlling power supply of an information processing device including load information |
| EP2387298A1 (en) * | 2010-05-13 | 2011-11-16 | Research In Motion Limited | Selecting a power path based on temperature |
| US8810073B2 (en) | 2010-05-13 | 2014-08-19 | Blackberry Limited | Selecting a power path based on temperature |
| US8836287B2 (en) | 2011-05-03 | 2014-09-16 | Apple Inc. | Time-domain multiplexing of power and data |
| US9774207B2 (en) | 2011-05-03 | 2017-09-26 | Apple Inc. | Time-domain multiplexing of power and data |
| CN107809129A (en) * | 2011-05-03 | 2018-03-16 | 苹果公司 | Power adapters, electronic installation and electronic system |
| US10658859B2 (en) | 2011-05-03 | 2020-05-19 | Apple Inc. | Time-domain multiplexing of power and data |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9909304D0 (en) | 1999-06-16 |
| JP2000078849A (en) | 2000-03-14 |
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