CN102221872A - Power supplying device and method - Google Patents
Power supplying device and method Download PDFInfo
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- CN102221872A CN102221872A CN2010101635545A CN201010163554A CN102221872A CN 102221872 A CN102221872 A CN 102221872A CN 2010101635545 A CN2010101635545 A CN 2010101635545A CN 201010163554 A CN201010163554 A CN 201010163554A CN 102221872 A CN102221872 A CN 102221872A
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Abstract
The invention relates to a power supplying method, comprising the steps of: detecting whether a universal serial bus port of a computer system is connected with an external connecting device; and leading a DC (direct current)-to-DC converter for generating a DC output voltage to the universal serial bus port in the computer system to stop the conversion to a DC input voltage when the universal serial bus port is not connected with the external connecting device.
Description
Technical field
The invention relates to a kind of power supply device and method, and particularly relevant for a kind of power supply device and method of computer system.
Background technology
It is early stage that (notebook, NB) (universal serial bus, USB) device uses beyond the power supply of 5V, still has many built-in devices also to use the power supply of 5V except external universal serial bus in the system because of notebook computer.Also also because of so, in the notebook computer system in order to the power supply device of the power supply of supply 5V from notebook computer start back with regard to continued power, till the notebook computer shutdown.
Yet along with progressing greatly of manufacture of semiconductor now, the employed power supply of notebook computer internal system device is reduced to 3.3V/1.8V/1.5V from 5V gradually.At present in the notebook computer system for the use of the power supply of 5V, except external universal sequence bus unit, almost do not have other device to use the power supply of 5V.
Base this, do not have when the notebook computer system under the situation of external sequence bus unit, the power supply device of power supply in order to supply 5V in the notebook computer system still can carry out power source conversion (power converting) with continued power.Thus, will cause meaningless energy dissipation (energyloss), thus the notion of the environmental protection (Green) of running counter to now to be advocated.
Summary of the invention
In view of this, the invention provides a kind of power supply device and method, it is able to not have under the situation of external universal sequence bus unit in the notebook computer system, cause in the notebook computer system power supply that stops to export 5V in order to the power supply device of the power supply of supply 5V, use and reach purpose of energy saving.
The invention provides a kind of power supply device, it comprises a direct current power supply unit and a current limliting IC circuit.Wherein, DC power supply is given the universal serial bus port of computer system in order to produce VD, and current limliting IC circuit then is coupled between DC power supply and the universal serial bus port.Wherein, current limliting IC circuit has first pin and second pin at least.Current limliting IC circuit is by the load condition of the first pin sensing universal serial bus port, use and judge whether the universal serial bus port connects external device, and whether be connected with external device and output control signals to DC power supply by second pin according to the universal serial bus port, use and open or close DC power supply.
In one embodiment of the invention, when current limliting IC circuit is connected with external device by first pin to judge the universal serial bus port, current limliting IC circuit is exported the control signal of first state by second pin, use the unlatching DC power supply, give the universal serial bus port thereby cause DC power supply to produce VD.Otherwise, when current limliting IC circuit is not connected with external device by first pin to judge the universal serial bus port, current limliting IC circuit is exported the control signal of second state by second pin, use and close DC power supply, give the universal serial bus port thereby cause DC power supply to stop to produce VD.
In one embodiment of the invention, when current limliting IC circuit also was in overload or short-circuit condition in order to the external device that is connected when the universal serial bus port, the protection computer system avoided being damaged.
The present invention also provides a kind of power supply device, and it comprises that the direct current transducer and that always circulates detects and protected location.The DC-DC converter is in order to receiving DC input voitage, and determines whether change described DC input voitage according to control signal, uses producing the universal serial bus port that VD is given computer system.Detection and protected location are coupled between DC-DC converter and the universal serial bus port; in order to when the universal serial bus port is not connected with external device, the control signal of exporting first state is controlled the DC-DC converter and is stopped to change described DC input voitage.
In one embodiment of the invention; detection and protected location are also in order to when the universal serial bus port is connected with external device; the control signal of exporting second state is controlled the DC-DC converter and is changed described DC input voitage, and conducts described VD to the universal serial bus port.
In one embodiment of the invention, when detection also was in overload or short-circuit condition in order to the external device that is connected when the universal serial bus port with protected location, the protection computer system avoided being damaged.
The present invention provides a kind of computer system with power supply device provided by the present invention again.
The present invention more provides a kind of power supply method, and whether it universal serial bus port that comprises detection computations machine system is connected with external device; And when the universal serial bus port is not connected with external device, causes in the computer system and stop DC input voitage being changed for the DC-DC converter of universal serial bus port in order to produce VD.
In one embodiment of the invention, power supply method also comprises when the universal serial bus port is connected with external device, causes the DC-DC converter to change described DC input voitage, uses to produce described VD to the universal serial bus port.
Based on above-mentioned, power supply device proposed by the invention and method can detect the load condition of universal serial bus port.When detecting (that is the universal serial bus port is not connected with external device) under the state that the universal serial bus port is a no-load, then cause in the computer system and stop DC input voitage being changed for the DC-DC converter of universal serial bus port in order to produce VD (that is power supply of 5V).Thus, can reach purpose of energy saving, thus the notion of the environmental protection that meets now to be advocated.In addition, be connected with under the state of external device, then cause DC-DC converter conversion DC input voitage, use producing VD (that is power supply of 5V) to the universal serial bus port when detecting the universal serial bus port.
Will be appreciated that above-mentioned general description and following embodiment only are exemplary and illustrative, it can not limit the scope that institute of the present invention desire is advocated.
Description of drawings
Fig. 1 illustrates the part synoptic diagram into the notebook computer system of one embodiment of the invention.
Fig. 2 A illustrates the outside drawing that encapsulates/be made into USB current limliting IC circuit for the detection of one embodiment of the invention and protected location.
Fig. 2 B illustrates the power supply device synoptic diagram into the employing USB current limliting IC circuit of one embodiment of the invention.
Fig. 3 illustrates the process flow diagram into the power supply method of one embodiment of the invention.
[main element label declaration]
100: power supply device 101,203: universal serial bus port
103: DC-DC converter 105: detect and protected location
105a: detecting unit 105b: protected location
200: current limliting IC circuit 201: DC power supply
Vin: DC input voitage Vout, V
USB: VD
CS: control signal
S301～S305: each step of power supply method process flow diagram of one embodiment of the invention
Embodiment
Now will the example of described one exemplary embodiment be described in the accompanying drawings in detail with reference to one exemplary embodiment of the present invention.In addition, all possibility parts use element/member of same numeral to represent identical or similar portions in graphic and embodiment.
Fig. 1 illustrates the part synoptic diagram of the notebook computer system (notebook system) into one embodiment of the invention.Please refer to Fig. 1, the notebook computer system comprises power supply device (powersupply apparatus) 100 and universal serial bus port (universal serial bus port, USB port) 101.Wherein, power supply device 100 comprises that the direct current transducer that always circulates (DC-to-DCconverter) 103 and detects and protected location (detecting-and-protectingunit) 105.
In present embodiment, DC-DC converter 103 can be voltage switch regulator (voltageswitching regulator), but is not restricted to this.DC-DC converter 103 comes from the DC input voitage Vin that prime DC-DC converter (not illustrating) provided (power supply of 19V for example in order to reception; but be not restricted to this); perhaps come from battery (battery; do not illustrate) the DC input voitage Vin that the provided (power supply of 9V～12.6V for example; but be not restricted to this); and according to detecting the control signal CS that is exported with protected location 105; and whether decision changes DC input voitage Vin, uses to produce the universal serial bus port one 01 that VD Vout (that is power supply of 5V) gives the notebook computer system.
Detection and protected location 105 are coupled between DC-DC converter 103 and the universal serial bus port one 01.In present embodiment; when universal serial bus port one 01 is not connected with external device (that is USB application apparatus; do not illustrate) time, the control signal CS of detection and protected location 105 outputs first state controls DC-DC converter 103 and stops to change DC input voitage Vin.
In addition; when universal serial bus port one 01 is connected with external device; detect the control signal CS that exports second state with protected location 105 and control DC-DC converter 103 conversion DC input voitage Vin, and conduct direct current output voltage V out is to universal serial bus port one 01.In addition; when the external device that is connected when universal serial bus port one 01 is in overload (over loading) state or short circuit (short circuit) state, detects with protected location 105 and can protect the notebook computer system to avoid being subjected to damaging (damage) by some protection mechanism (describing in detail again after the appearance).
In present embodiment, detection comprises detecting unit 105a and protected location 105b with protected location 105.Wherein, whether detecting unit 105a is connected with external device (that is detect universal serial bus port one 01 load condition) in order to detect universal serial bus port one 01, and the control signal CS that exports first state or second state according to this gives DC-DC converter 103.When protected location 105b was in overload or short-circuit condition in order to the external device that is connected when universal serial bus port one 01, protection notebook computer system avoided being damaged.
Clearer, detection can be after the notebook computer start with protected location 105, and whether lasting detection user has is inserted into universal serial bus port one 01 with the USB application apparatus.Detect the user when any USB application apparatus not being inserted into universal serial bus port one 01 when detecting with protected location 105; detect and for example to export the control signal CS of logic high with protected location 105 and control DC-DC converter 103 and stop to change DC input voitage Vin, that is stop the running of power source conversion.Thus, DC-DC converter 103 just can not produce meaningless energy dissipation.
On the other hand; detect the user when a certain USB application apparatus being inserted into universal serial bus port one 01 when detecting with protected location 105; detect to transfer to and for example export that the control signal CS of logic low controls DC-DC converter 103 conversion DC input voitage Vin, that is start the running of power source conversion with protected location 105.Thus; DC-DC converter 103 promptly can produce the VD Vout of 5V; and conduct to universal serial bus port one 01 via detecting, use offering the required power supply of USB application apparatus that is inserted into universal serial bus port one 01 with protected location 105.
Via above-mentioned explanation as can be known, 103 meetings of DC-DC converter are connected with under the situation of external device (USB application apparatus) at universal serial bus port one 01, just can start the running of power source conversion, use offering the required power supply (that is power supply of 5V) of USB application apparatus that is inserted into universal serial bus port one 01.Otherwise DC-DC converter 103 will stop DC input voitage Vin is changed, and use to prevent meaningless energy dissipation (energy loss).
In other words, as long as be not connected with under the situation of external device (USB application apparatus) at universal serial bus port one 01, the VD Vout that DC-DC converter 103 just can not produce 5V gives universal serial bus port one 01, and only be connected with under the situation of external device (USB application apparatus) at universal serial bus port one 01, the VD Vout that DC-DC converter 103 just can produce 5V gives universal serial bus port one 01.
What deserves to be mentioned is in this, though controlling DC-DC converter 103 with the control signal CS of logic high, the foregoing description stops to change DC input voitage Vin, and to control DC-DC converter 103 conversion DC input voitage Vin with the control signal CS of logic low be that example describes, but the present invention is not restricted to this.
In other embodiments of the invention, control signal CS that can also logic low controls DC-DC converter 103 and stops to change DC input voitage Vin, and control DC-DC converter 103 conversion DC input voitage Vin with the control signal CS of logic high, as long as keep and the corresponding running of the foregoing description.
On the other hand, detection of the foregoing description and protected location 105 can be made into integrated circuit (integrated circuit IC), and for example is a USB current limliting IC circuit.Thus; the external device (USB application apparatus) that is connected when universal serial bus port one 01 is when being in overload or short-circuit condition (that is moment take out carry excessive), protects the notebook computer system to avoid being damaged by the mechanism (but being not restricted to this) of current limliting.
Clearer; Fig. 2 A illustrates the outside drawing that encapsulates/be made into USB current limliting IC circuit 200 for the detection of one embodiment of the invention and protected location 105, and Fig. 2 B illustrates the power supply device synoptic diagram into the employing USB current limliting IC circuit 200 of one embodiment of the invention.Please merge with reference to Fig. 2 A and Fig. 2 B, at first can know from Fig. 2 A and find out, current limliting IC circuit 200 is an IC with 8 pins (pin).
On the other hand, the DC-DC converter 103 addressed of a last embodiment can be regarded as the 5V DC power supply 201 in the notebook computer system in Fig. 2 B.Therefore, DC power supply 201 is in order to produce VD V
USBUse for the universal serial bus port 203 of notebook computer system.
In present embodiment, current limliting IC circuit 200 is coupled between DC power supply 201 and the universal serial bus port 203.And, current limliting IC circuit 200 can be by the load condition (loading state) of pin OUT sensing universal serial bus port 203, use and judge whether universal serial bus port 203 is connected with external device (that is USB application apparatus), and whether be connected with external device according to universal serial bus port 203 and pass through pin OE output control signal CS to DC power supply 201, use and open or close DC power supply 201.
Clearer, when current limliting IC circuit 200 is connected with external device by pin OUT to judge universal serial bus port 203, current limliting IC circuit 200 can for example be exported by pin OE, and logic low (but is not restricted to this, also can be logic high) control signal CS, use and open DC power supply 201, thereby cause DC power supply 201 to produce VD V
USBUse for universal serial bus port 203.
On the other hand, when current limliting IC circuit 200 is not connected with external device by pin OUT to judge universal serial bus port 203, current limliting IC circuit 200 can for example be exported by pin OE, and logic high (but is not restricted to this, also can be logic low) control signal CS, use and close DC power supply 201, thereby cause DC power supply 201 to stop to produce VD V
USBUse for universal serial bus port 203.
In addition, on practice was used, when current limliting IC circuit 200 can also be in overload or short-circuit condition at the external device that universal serial bus port 203 is connected, protection notebook computer system avoided being damaged.
Based on above-mentioned, Fig. 3 illustrates the process flow diagram into the power supply method of one embodiment of the invention.Please refer to Fig. 3, the power supply method of present embodiment may further comprise the steps: as described in step S301, whether the universal serial bus port (USB port) of detection computations machine system (for example notebook computer system) is connected with external device (that is USB application apparatus).
In present embodiment, when the universal serial bus port is not connected with external device, then as described in the step S303, cause in the computer system in order to produce VD (that is power supply of 5V) and stop the DC input voitage that comes from prime DC-DC converter or battery and provided is changed for the DC-DC converter of universal serial bus port.In addition, when the universal serial bus port is connected with external device, then as described in the step S305, cause the conversion of DC-DC converter to come from the DC input voitage that prime DC-DC converter or battery are provided, use producing VD (that is power supply of 5V) to the universal serial bus port.
In sum, power supply device proposed by the invention and the method load condition that can detect the universal serial bus port.When detecting (that is the universal serial bus port is not connected with external device) under the state that the universal serial bus port is a no-load, then cause in the computer system and stop DC input voitage being changed for the DC-DC converter of universal serial bus port in order to produce VD (that is power supply of 5V).Thus, can reach purpose of energy saving, thus the notion of the environmental protection that meets now to be advocated.In addition, be connected with under the state of external device, then cause DC-DC converter conversion DC input voitage, use producing VD (that is power supply of 5V) to the universal serial bus port when detecting the universal serial bus port.
Though the present invention discloses as above with embodiment; right its is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking appended the claim scope person of defining.
Claims (16)
1. power supply device comprises:
One direct current power supply unit is given a universal serial bus port of a computer system in order to produce a direct current output voltage; And
One current limliting IC circuit is coupled between this DC power supply and this universal serial bus port,
Wherein, this current limliting IC circuit has one first pin and one second pin at least, this current limliting IC circuit is by the load condition of this this universal serial bus port of first pin sensing, use and judge whether this universal serial bus port connects an external device, and whether be connected with an external device and control signal to this DC power supply by this second pin output one according to this universal serial bus port, use and open or close this DC power supply.
2. power supply device according to claim 1, wherein when this current limliting IC circuit is connected with this external device by this first pin to judge this universal serial bus port, this current limliting IC circuit is exported this control signal of one first state by this second pin, use and open this DC power supply, give this universal serial bus port thereby cause this DC power supply to produce this VD.
3. power supply device according to claim 1, wherein when this current limliting IC circuit is not connected with this external device by this first pin to judge this universal serial bus port, this current limliting IC circuit is exported this control signal of one second state by this second pin, use and close this DC power supply, give this universal serial bus port thereby cause this DC power supply to stop to produce this VD.
4. power supply device according to claim 1 when wherein this current limliting IC circuit also is in an overload or a short-circuit condition in order to this external device that is connected when this universal serial bus port, protects this computer system to avoid being damaged.
5. power supply device according to claim 1, this first state one that is a logic high and a logic low wherein, and this second state is this logic high and this logic low another.
6. power supply device according to claim 1, wherein this DC power supply comprises a voltage switch regulator, and this computer system comprises a notebook computer system.
7. computer system with power supply device as claimed in claim 1.
8. power supply device comprises:
The direct current transducer that always circulates in order to receiving a direct current input voltage, and determines whether change this DC input voitage according to a control signal, uses producing the universal serial bus port that a direct current output voltage is given a computer system; And
One detects and protected location; be coupled between this DC-DC converter and this universal serial bus port; in order to when this universal serial bus port is not connected with an external device, this control signal of exporting one first state is controlled this DC-DC converter and is stopped to change this DC input voitage.
9. power supply device according to claim 8; wherein this detection and protected location are also in order to when this universal serial bus port is connected with this external device; this control signal of exporting one second state is controlled this DC-DC converter and is changed this DC input voitage, and conducts this VD to this universal serial bus port.
10. power supply device according to claim 8 when wherein this detection also is in an overload or a short-circuit condition in order to this external device that is connected when this universal serial bus port with protected location, protects this computer system to avoid being damaged.
11. power supply device according to claim 10, wherein this detection and protected location comprise:
Whether one detecting unit is connected with this external device in order to detect this universal serial bus port, and exports this control signal of this first state or this second state according to this; And
One protected location when being in this overload or this short-circuit condition in order to this external device that is connected when this universal serial bus port, protects this computer system to avoid being damaged by a current limiting mechanism.
12. power supply device according to claim 8, this first state one that is a logic high and a logic low wherein, and this second state is this logic high and this logic low another.
13. power supply device according to claim 8, wherein this DC-DC converter comprises a voltage switch regulator, and this computer system comprises a notebook computer system.
14. computer system with power supply device as claimed in claim 8.
15. a power supply method comprises:
Whether a universal serial bus port that detects a computer system is connected with an external device; And
When this universal serial bus port is not connected with this external device, causes in this computer system and stop a direct current input voltage is changed for the direct current transducer of circulation always of this universal serial bus port in order to produce a direct current output voltage.
16. power supply method according to claim 15 also comprises:
When this universal serial bus port is connected with this external device, cause this DC-DC converter to change this DC input voitage, use producing this VD to this universal serial bus port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101635545A CN102221872A (en) | 2010-04-16 | 2010-04-16 | Power supplying device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101635545A CN102221872A (en) | 2010-04-16 | 2010-04-16 | Power supplying device and method |
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| Publication Number | Publication Date |
|---|---|
| CN102221872A true CN102221872A (en) | 2011-10-19 |
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ID=44778440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101635545A Pending CN102221872A (en) | 2010-04-16 | 2010-04-16 | Power supplying device and method |
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| Country | Link |
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| CN (1) | CN102221872A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866768A (en) * | 2012-07-27 | 2013-01-09 | 郑州信大捷安信息技术股份有限公司 | Device and power-saving method based on USB (universal serial bus) master device |
| CN103853685A (en) * | 2012-11-30 | 2014-06-11 | 英业达科技有限公司 | Universal serial bus circuit and operation method thereof |
| CN105988545A (en) * | 2015-02-09 | 2016-10-05 | 鸿富锦精密工业(武汉)有限公司 | Electronic device and power supply interface |
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| KR20080063667A (en) * | 2007-01-02 | 2008-07-07 | 엘지전자 주식회사 | Apparatus and method for auto system on/off control in usb device |
| CN201142049Y (en) * | 2007-08-24 | 2008-10-29 | 青岛海信电器股份有限公司 | USB protection circuit |
| CN101593990A (en) * | 2008-02-13 | 2009-12-02 | 技领半导体(上海)有限公司 | Realize method, device and the integrated circuit of the intellectual power management of USB port |
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| CN1295272A (en) * | 1999-11-08 | 2001-05-16 | 神基科技股份有限公司 | Computer unit |
| KR20080063667A (en) * | 2007-01-02 | 2008-07-07 | 엘지전자 주식회사 | Apparatus and method for auto system on/off control in usb device |
| CN201142049Y (en) * | 2007-08-24 | 2008-10-29 | 青岛海信电器股份有限公司 | USB protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102866768A (en) * | 2012-07-27 | 2013-01-09 | 郑州信大捷安信息技术股份有限公司 | Device and power-saving method based on USB (universal serial bus) master device |
| CN103853685A (en) * | 2012-11-30 | 2014-06-11 | 英业达科技有限公司 | Universal serial bus circuit and operation method thereof |
| CN105988545A (en) * | 2015-02-09 | 2016-10-05 | 鸿富锦精密工业(武汉)有限公司 | Electronic device and power supply interface |
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Application publication date: 20111019 |