CN201732337U - Switching circuit of handheld device - Google Patents
Switching circuit of handheld device Download PDFInfo
- Publication number
- CN201732337U CN201732337U CN2010205129980U CN201020512998U CN201732337U CN 201732337 U CN201732337 U CN 201732337U CN 2010205129980 U CN2010205129980 U CN 2010205129980U CN 201020512998 U CN201020512998 U CN 201020512998U CN 201732337 U CN201732337 U CN 201732337U
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- diode
- cpu
- power supply
- circuit
- switching
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Abstract
The utility model relates to a switching circuit of a handheld device, which comprises a CPU, a switching power supply U2 and a switching-on button S1, as well as a diode D1, a diode D2 and a resistor R1, wherein one end of the switching-on button S1 is connected with the input end of the switching power supply U2, and the other end is simultaneously connected with positive poles of the diode D1 and the diode D2; a negative pole of the diode D1 is connected with an INT pin of the CPU; and the negative pole of the diode D2 is respectively connected with an enabling pin of the switching power supply U2 and the resistor R1, and the other end of the resistor R1 is connected with an IO pin of the CPU. The circuit can realize the functions of the switching machine by only increasing 3 devices on the basis of the prior art, thereby having the advantages of simple circuit, low cost, and no consumption of energy of a battery during switching-off.
Description
[technical field]
The utility model relates to on/off circuit, specifically is meant a kind of on/off circuit of handheld device.
[background technology]
In the data communication epoch of high speed development, more and more equipments is pursued miniaturization, and cost also constantly forces down thereupon, so one simple and effective circuit is particularly important when design.
The start and close circuit that uses in the handheld device divides two kinds at present:
A kind of is soft boot-strap circuit, and the shutdown of this handheld device is a kind of illusion in fact, and the power supply of CPU does not cut off.This a kind of circuit is in when shutdown, and power supply still has to the CPU power supply, and CPU just enters sleep pattern.The principle of this a kind of circuit is: whether the interruption pin of CPU detects outside start button and presses, and when the start button was pressed, CPU jumped out from sleep pattern, start-up system.The advantage of this a kind of circuit is that circuit is simple, and cost is lower.But shortcoming is also arranged, and is exactly the energy of CPU in can consuming cells when not starting shooting, and long-time not start can cause the low-voltage variation of battery, causes the damage of battery.
Another kind of circuit is to use several logical circuits to realize startup and shutdown.The principle of work of this a kind of circuit is: logical circuit control metal-oxide-semiconductor is opened the electric power starting of system the back and is produced one from lock signal by power unit when button is pressed, and the self-locking signal feedback is controlled the state that metal-oxide-semiconductor is kept start.Be that system detects button and presses during shutdown, the signal of excision self-locking reaches the purpose of shutdown.The advantage of this a kind of circuit is: be to cut off the electricity supply fully when system closing, so just do not have the problem of consume battery power.But it realizes more complicated, and the cost of realizing is than higher.
[utility model content]
Technical problem to be solved in the utility model is to provide that a kind of circuit is simple, cost is low, and the handheld device on/off circuit of consume battery power not during shutdown.
The utility model solves the problems of the technologies described above by the following technical solutions:
A kind of on/off circuit of handheld device comprises a CPU, a Switching Power Supply U2, a start button S1; Also comprise diode D1, diode D2, resistance R 1; The input end of described start button S1 one termination Switching Power Supply U2, the other end connects the positive pole of diode D1, diode D2 simultaneously; The negative pole of described diode D1 connects the INT pin of described CPU; What the negative pole of described diode D2 met described Switching Power Supply U2 respectively enables pin and described resistance R 1, the IO pin of another termination CPU of resistance R 1.
The model of described Switching Power Supply U2 is TPS54331.
Advantage of the present utility model is: the utility model has only increased the function that 3 devices have just been realized switching on and shutting down on the basis of existing technology, and therefore, circuit is simple, cost is low, and consume battery power not during shutdown.
[description of drawings]
The utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the utility model circuit theory diagrams.
Fig. 2 is the utility model start process flow diagram.
Fig. 3 is the utility model shutdown process figure.
[embodiment]
A kind of on/off circuit of handheld device as shown in Figure 1, comprises a CPU, a Switching Power Supply U2 (TPS54331), a start button S1; Also comprise diode D1, diode D2, resistance R 1; The input end of described start button S1 one termination Switching Power Supply U2 (TPS54331), the other end connects the positive pole of diode D1, diode D2 simultaneously; The negative pole of described diode D1 connects the INT pin of described CPU; What the negative pole of described diode D2 met described Switching Power Supply U2 (TPS54331) respectively enables pin (the 3rd pin) and described resistance R 1, the IO pin of another termination CPU of resistance R 1.
Concrete realization flow is as follows:
The start flow process is consulted Fig. 2, when start button S1 presses, and start button S1 output high level, diode D1, D2 conducting, diode D2 actuating switch power supply U2 (TPS54331), the voltage of the EN pin of Switching Power Supply U2 (TPS54331) is high level just; Switching Power Supply U2 (TPS54331) starts working, and CPU just starts then; CPU starts the back and produces a high level by the CPU_IO pin, high level by resistance R 1 to Switching Power Supply enable control, when S1 also is in the effect that resistance R 1 when pressing plays the balance of voltage; After keyswitch S1 unclamps, provide for Switching Power Supply U2 and enable by the CPU_IO pin, realize system from lock control.
Shutdown process is consulted Fig. 3, and S1 is long on time when the start button, start button S1 output high level, diode D1, D2 conducting; Diode D1 conducting, CPU detects CPU_INT and is in high level for a long time, just judge the shutdown action, export a low level by the CPU_IO pin of CPU then, this moment, the start button S1 owing to the user did not unclamp, because the existence of resistance R 1, so power supply is also being powered to system, so will close the peripheral hardware of demonstration this moment, give the illusion of a kind of shutdown of user, system's deenergization completely just when the user unclamps start button S1.The electric current of this moment has only the leakage current of MOS, and the electric current of this moment has only 1uA.Battery capacity 900mAh according to regular handset calculates, and probably can use 100 years, so can ignore.
The utility model has only increased the function that 3 devices have just been realized switching on and shutting down on the basis of existing technology, and therefore, circuit is simple, cost is low, and consume battery power not during shutdown.
Claims (2)
1. the on/off circuit of a handheld device comprises a CPU, a Switching Power Supply U2, a start button S1; It is characterized in that: also comprise diode D1, diode D2, resistance R 1; The input end of described start button S1 one termination Switching Power Supply U2, the other end connects the positive pole of diode D1, diode D2 simultaneously; The negative pole of described diode D1 connects the INT pin of described CPU; What the negative pole of described diode D2 met described Switching Power Supply U2 respectively enables pin and described resistance R 1, the IO pin of another termination CPU of resistance R 1.
2. the on/off circuit of a kind of handheld device as claimed in claim 1, it is characterized in that: the model of described Switching Power Supply U2 is TPS54331.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205129980U CN201732337U (en) | 2010-09-01 | 2010-09-01 | Switching circuit of handheld device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205129980U CN201732337U (en) | 2010-09-01 | 2010-09-01 | Switching circuit of handheld device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201732337U true CN201732337U (en) | 2011-02-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205129980U Expired - Fee Related CN201732337U (en) | 2010-09-01 | 2010-09-01 | Switching circuit of handheld device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201732337U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333238A (en) * | 2014-10-17 | 2015-02-04 | 重庆金宏汽车电子有限公司 | Power supply circuit for navigation device |
| CN104731305A (en) * | 2015-04-03 | 2015-06-24 | 青岛歌尔声学科技有限公司 | Shutdown control circuit and electronic product with same |
| CN105207475A (en) * | 2015-10-21 | 2015-12-30 | 重庆金宏汽车电子有限公司 | Power circuit of automobile remote control device |
| CN105334763A (en) * | 2014-07-17 | 2016-02-17 | 优利科技有限公司 | Model airplane remote controller and startup and shutdown circuit thereof |
| CN106292341A (en) * | 2015-05-14 | 2017-01-04 | 深圳市三诺数字科技有限公司 | A kind of power on/off system and method |
| WO2017181493A1 (en) * | 2016-04-20 | 2017-10-26 | 成都艾尔伯特科技有限责任公司 | Power circuit for led light adjusting plate |
| CN108648817A (en) * | 2018-05-23 | 2018-10-12 | 深圳市理邦精密仪器股份有限公司 | A kind of power control and its patient monitor |
-
2010
- 2010-09-01 CN CN2010205129980U patent/CN201732337U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105334763A (en) * | 2014-07-17 | 2016-02-17 | 优利科技有限公司 | Model airplane remote controller and startup and shutdown circuit thereof |
| CN105334763B (en) * | 2014-07-17 | 2018-08-28 | 优利科技有限公司 | Model of an airplane remote controler and its on/off circuit |
| CN104333238A (en) * | 2014-10-17 | 2015-02-04 | 重庆金宏汽车电子有限公司 | Power supply circuit for navigation device |
| CN104731305A (en) * | 2015-04-03 | 2015-06-24 | 青岛歌尔声学科技有限公司 | Shutdown control circuit and electronic product with same |
| CN104731305B (en) * | 2015-04-03 | 2017-08-25 | 青岛歌尔声学科技有限公司 | Shutdown control circuit and the electronic product with the shutdown control circuit |
| CN106292341A (en) * | 2015-05-14 | 2017-01-04 | 深圳市三诺数字科技有限公司 | A kind of power on/off system and method |
| CN106292341B (en) * | 2015-05-14 | 2019-01-04 | 深圳市三诺数字科技有限公司 | A kind of power on/off system and method |
| CN105207475A (en) * | 2015-10-21 | 2015-12-30 | 重庆金宏汽车电子有限公司 | Power circuit of automobile remote control device |
| WO2017181493A1 (en) * | 2016-04-20 | 2017-10-26 | 成都艾尔伯特科技有限责任公司 | Power circuit for led light adjusting plate |
| CN108648817A (en) * | 2018-05-23 | 2018-10-12 | 深圳市理邦精密仪器股份有限公司 | A kind of power control and its patient monitor |
| CN108648817B (en) * | 2018-05-23 | 2021-10-22 | 深圳市理邦精密仪器股份有限公司 | Power supply control device and patient monitor thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 350000, No. 16, building G, zone four, Fuzhou Software Park, 89 software Avenue, Gulou District, Fujian, Fuzhou Patentee after: Hengonda Technology Co., Ltd. Address before: Wufeng Street software Avenue Gulou District of Fuzhou city in Fujian province 350000 No. 89 Fuzhou software industrial park two 7 floor third floor Patentee before: Fujian Sanyuanda Software Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110202 Termination date: 20190901 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |