CN1790232A - Power supply switching circuit for personal portable terminal - Google Patents
Power supply switching circuit for personal portable terminal Download PDFInfo
- Publication number
- CN1790232A CN1790232A CN 200410089555 CN200410089555A CN1790232A CN 1790232 A CN1790232 A CN 1790232A CN 200410089555 CN200410089555 CN 200410089555 CN 200410089555 A CN200410089555 A CN 200410089555A CN 1790232 A CN1790232 A CN 1790232A
- Authority
- CN
- China
- Prior art keywords
- switch
- power supply
- power
- backup battery
- open
- 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.)
- Pending
Links
Landscapes
- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention discloses a power switching circuit of portable terminal machine, which comprises the following parts: main power switch, duplicate power switch and power switching control device, wherein the main power switch opens or closes according to the input control signal, which provides power for terminal machine; the duplicate power switch provides the duplicate power for the terminal machine according to the input control signal; the power switching control device compares the voltage difference of power switch and duplicate power switch, which inputs different control signals for main power switch and duplicate power switch separately. The invention can reduce the current consumption of duplicate power, which reduces the battery dimension of duplicate power.
Description
[technical field]
The invention relates to the power supply switch circuit of portable terminal computer, specifically, the invention relates to the power supply switch circuit of individual portable terminal: in order to change power-supply battery with following function, when taking out battery, in terminating machine, switch to backup battery, thereby reduce unnecessary power consumption in the backup battery.
[background technology]
In general, individual portable terminal (personal digital assistant:PDA) all with storage of subscriber data in dynamic RAM (DRAM).When changing the battery of this PDA, because the using system power supply, the user could change battery after must storing own data safely.
In order to eliminate the user must store own data when changing the PDA battery inconvenience, according to original technology, when changing (swap) battery, all use the other backup battery that is not battery, preserve the content in the dynamic RAM, thereby make the user need not store the user data of oneself and change battery.
Above-mentioned backup battery generally all uses coin cell, in order to use above-mentioned backup battery, before changing battery, system must be switched to on-hook pattern (suspend mode) (utilizing minimum electric power to drive the pattern of terminating machine).
For said system being switched to the on-hook pattern, ejection (eject) switch must be arranged, in the terminating machine before battery is taken out, if control above-mentioned ejection switch from terminating machine, system just switches to the on-hook pattern, and replaces primary power to provide electric power to system by backup battery.Above-mentioned ejection switch is to be used for the primary power battery is fixedly installed to switch in the terminating machine, opens automatically when taking out battery from terminating machine.
Fig. 1 is the pie graph (a) and the time flow chart (b) thereof of the power supply switch circuit of original individual portable terminal.As shown in the figure, according to the signal from the output of ejection switch, power supply is supplied with and is switched to backup battery by primary power, and system also switches to the on-hook pattern.
Below, schematic illustration is carried out in the operation of this original power supply switch circuit.
In order to change the primary power battery, eject switch if open, according to the signal that ejects switch output, just close main power switch 1, thereby make main battery not supply electric power, thereby open backup switch 2, utilize the coin cell backup battery to provide backup battery to system.
Primary power switches to backup battery, crossed certain hour after, system just switches to the on-hook pattern.After changing the primary power battery, open again and eject switch, according to the signal that ejects switch output, open main power switch 1, close backup switch 2, utilize primary power to provide backup battery to system.Simultaneously, after the switch certain hour was ejected in unlatching, system just removed the on-hook pattern, carried out the normal mode operation.
Certainly, original power supply switch circuit switches to the backup switch by main power switch before system enters the on-hook pattern, makes backup battery just consume a large amount of electric currents in moment.
[summary of the invention]
As mentioned above, before originally the power supply switch circuit of PAD relies on the signal that ejects switch output to make system switch to the on-hook pattern,, exist the problem that must consume a large amount of backup battery electric currents in order to realize switching.
Therefore, in order to address this problem, the present invention just arises at the historic moment.The purpose of this invention is to provide a kind of power supply switch circuit: possess the power supply switching control with individual portable terminal of following function, whether this control device can be discerned the primary power battery and extract, thereby the switching of control primary power and backup battery, after system switches to the on-hook pattern, carrying out power supply switches, thereby reduce the current drain of backup battery, and reduce the size of backup battery thus.
To achieve these goals, the present invention has the feature of being made up of following each several part: open or close according to the switch controlling signal of importing from the outside, if just open the main power switch that power supply is provided to terminating machine by primary power; Open or close according to the switch controlling signal of importing from the outside, if just open the backup battery switch that power supply is provided to terminating machine by backup battery; Voltage difference to above-mentioned main power switch and backup battery switch compares, and according to comparative result, imports the power supply switching control of different switch controlling signals respectively to main power switch and backup battery switch.
Simultaneously, above-mentioned power supply switching control has following feature: if main power voltage than backup battery voltage height, just open switch controlling signal by above-mentioned main power switch output, is exported the off switch control signal by the backup switch; If main power voltage is lower than backup battery voltage, just, open switch controlling signal by the output of backup switch by above-mentioned main power switch output off switch control signal.
What as above described in detail is such, the present invention possesses the power supply switching control, whether thereby can recognize the primary power battery transfers to from terminating machine, and carry out the switching of primary power and backup battery, after system switches to the on-hook pattern, carry out the power supply switching, thereby reduce the current drain of backup battery, and reduce the size of backup battery thus.
[description of drawings]
Fig. 1 is the pie graph (a) and the time flow chart (b) thereof of the power supply switch circuit of original individual portable terminal.
Fig. 2 is pie graph (a) and the time flow chart (b) thereof according to the power supply switch circuit of individual portable terminal of the present invention.
[embodiment]
Below with reference to accompanying drawings the individual portable terminal power supply switch circuit of the present invention of the foundation with above-mentioned feature embodiment is elaborated.
Fig. 2 is pie graph (a) and the time flow chart (b) thereof according to the power supply switch circuit of individual portable terminal of the present invention.As shown in the figure, present invention includes power supply switching control 3, it can discern the voltage difference between primary power and backup battery, thus the switching of control main power switch 1 and backup switch room.
If above-mentioned power supply switching control 3 recognizes main power voltage than backup battery voltage height (being that power-supply battery is installed in the terminating machine), just export low (L) signal, and power-on switch 1, close backup switch 2.
On the contrary, if, battery is separated the words of (that is: main power voltage is lower than backup battery voltage) from terminating machine in order to change the primary power battery, above-mentioned power supply switching control 3 is just exported high signal (H), and powered-down switch 1, open backup switch 2, make the terminating machine operation.At this moment, shown in Fig. 2 b, backup battery is used after system switches to hook state, just so power supply institute consumed current diminish.
Like this, can the ruuning situation of the present invention with this formation be elaborated the reference time process flow diagram.
At first, the user is in order to change the primary power pulling and inserting type battery of PDA, and the ejection switch (not showing on the figure) in just operation (the promptly opening) PDA makes system switch to the on-hook pattern.
Even system switches to the on-hook pattern, because the primary power battery does not take out from terminating machine, so 3 pairs of main power voltages of power supply switching control and backup battery voltage are still exported low signal when comparing, main power switch 1 is still opened thus, and terminating machine is still by the primary power operation.
In this state, be that system switches under the state of on-hook pattern, terminating machine keeps relying on the state of primary power operation, in order to change the primary power battery, if the primary power battery is taken out from terminating machine, power transfer device 3 is when comparing main power voltage and backup battery voltage, just export high signal, and rely on high signal that main power switch 1 is closed, and backup switch 2 is just opened, and terminating machine relies on the backup battery operation.
Comparing with original technology, it is as follows to be described in more detail: according to original technology, open eject switch in, if primary power switches to backup battery, behind certain hour, just system switches to the on-hook pattern; According to the present invention, behind the ejection switch open certain hour, though system switches to the on-hook pattern, in fact when the primary power battery took out from terminating machine, primary power just switched to backup battery, thereby can reduce the electric power that backup battery consumes.
System is in hook state, when relying on backup battery to make the terminating machine operation, if the primary power battery of changing is inserted terminating machine, power supply switching control 3 can recognize principal voltage voltage ratio backup battery voltage height, thereby output low signal, and rely on this low signal that the backup beginning is closed, main power switch 1 is opened, thereby the primary power battery that utilizes replacing to insert in the terminating machine make the terminating machine operation.
After above-mentioned backup battery switches to primary power, eject switch and just open, system by the on-hook mode switch to normal mode.
Claims (3)
1, individual portable terminal power supply switch circuit comprises:
Open or close according to the switch controlling signal of importing from the outside, if just open the main power switch that power supply is provided to terminating machine by primary power;
Open or close according to the switch controlling signal of importing from the outside, if just open the backup battery switch that power supply is provided to terminating machine by backup battery;
Voltage difference to above-mentioned main power switch and backup battery switch compares, and according to comparative result, imports the power supply switching control of different switch controlling signals respectively to main power switch and backup battery switch.
2, as claim item 1 described individual portable terminal power supply switch circuit, it is characterized in that described power supply switching control has:
If main power voltage than backup battery voltage height, just open switch controlling signal by above-mentioned main power switch output, is exported the off switch control signal by the backup switch;
If main power voltage is lower than backup battery voltage, just, open switch controlling signal by the output of backup switch by above-mentioned main power switch output off switch control signal.
3, as claim item 1 described individual portable terminal power supply switch circuit, it is characterized in that, after said system switches to the on-hook pattern, back up switch open, and provide power supply to terminating machine by backup battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410089555 CN1790232A (en) | 2004-12-15 | 2004-12-15 | Power supply switching circuit for personal portable terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410089555 CN1790232A (en) | 2004-12-15 | 2004-12-15 | Power supply switching circuit for personal portable terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1790232A true CN1790232A (en) | 2006-06-21 |
Family
ID=36788135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410089555 Pending CN1790232A (en) | 2004-12-15 | 2004-12-15 | Power supply switching circuit for personal portable terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1790232A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101252762B (en) * | 2008-04-14 | 2012-07-18 | 中兴通讯股份有限公司 | Base station power supply main standby switching control method based on minitype electric communication computing architecture standard |
| CN105098853A (en) * | 2014-05-09 | 2015-11-25 | 荆延杰 | Portable equipment |
| CN109633291A (en) * | 2018-12-20 | 2019-04-16 | 兰州空间技术物理研究所 | Bias current master backup switching circuit in a kind of space electric field detection system |
-
2004
- 2004-12-15 CN CN 200410089555 patent/CN1790232A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101252762B (en) * | 2008-04-14 | 2012-07-18 | 中兴通讯股份有限公司 | Base station power supply main standby switching control method based on minitype electric communication computing architecture standard |
| CN105098853A (en) * | 2014-05-09 | 2015-11-25 | 荆延杰 | Portable equipment |
| CN105098853B (en) * | 2014-05-09 | 2019-02-22 | 荆延杰 | A kind of portable device |
| CN109633291A (en) * | 2018-12-20 | 2019-04-16 | 兰州空间技术物理研究所 | Bias current master backup switching circuit in a kind of space electric field detection system |
| CN109633291B (en) * | 2018-12-20 | 2020-11-27 | 兰州空间技术物理研究所 | Bias current main backup switching circuit in space electric field detection system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8004352B1 (en) | Low leakage power management | |
| CN100489933C (en) | Panel module and its electric saving method | |
| CN101621569B (en) | Uninterruptedly powered handset and use method | |
| CN1805458A (en) | Display screen electronic device | |
| CN103959648B (en) | Save the power gating apparatus and method of electric charge | |
| CN2560039Y (en) | Data-processing equipment without missing data after power-off | |
| JP2003509763A (en) | Apparatus and method for supplying power to a computer auxiliary device via a computer bus system | |
| CN101853067B (en) | Methods for reducing power consumption and a device with an embedded memory module | |
| CN1790232A (en) | Power supply switching circuit for personal portable terminal | |
| EP1474736A2 (en) | Powering down display screens of processor-based systems | |
| CN201444648U (en) | Auto-adjusting circuit for button light brightness and mobile phone with same | |
| CN114932840A (en) | Control method and device of power management system, storage medium and processor | |
| CN114834254A (en) | Control method and device of power management system, storage medium and processor | |
| CN100373296C (en) | Electronic device | |
| CN1870791A (en) | Intelligent electric-saving device and method of mobile phone | |
| CN101587799A (en) | Relay driving module and electronic device applying same | |
| CN2904457Y (en) | Three state feedback power controlling circuit | |
| CN101388680A (en) | Portable electronic device and electricity saving method | |
| CN102053698B (en) | Computer and network card control method | |
| CN208157073U (en) | A kind of power-down protection circuit and solid state hard disk of NAND Flash chip | |
| CN1805240A (en) | Power supply circuit for electronic devices | |
| CN103311977A (en) | Portable electronic equipment power supply maintaining circuit and method | |
| CN2859893Y (en) | Selective circuit of main battery and emergency battery | |
| JP2010172088A (en) | Electronic apparatus and charging control method | |
| CN101957647A (en) | Portable computer system, relevant power supply device and charging method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |