CN102541228A - Startup and shutdown implementing method and device capable of preventing restart power failure of microprocessor - Google Patents
Startup and shutdown implementing method and device capable of preventing restart power failure of microprocessor Download PDFInfo
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- CN102541228A CN102541228A CN2010105945964A CN201010594596A CN102541228A CN 102541228 A CN102541228 A CN 102541228A CN 2010105945964 A CN2010105945964 A CN 2010105945964A CN 201010594596 A CN201010594596 A CN 201010594596A CN 102541228 A CN102541228 A CN 102541228A
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Abstract
The invention discloses a startup and shutdown implementing method and a startup and shutdown implementing device capable of preventing the restart power failure of a microprocessor. The implementing method comprises the following steps of: a light touch switch is pressed down; a supply converter is enabled to output the working voltage and is kept in a non-work state; a microprocessor operates a startup program; the supply converter is locked and enabled; the light touch switch is loosened; a circuit is kept working in a charged mode; and the supply converter is enabled again to enter a stable startup state. By a startup and shutdown circuit designed by the invention, not only the basic one-press startup and shutdown function is ensured, but also a power supply can be ensured stable when the microprocessor is in a restart state. The circuit is simple and easy to use, has reliable functions and is suitable to generally popularize.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of implementation method and device of the one-touch switching on and shutting down of system's power down when preventing that microprocessor from restarting.
Background technology
One-touch power on/off function is realized the unlatching of system power supply or is closed with the same action of touch-switch.Start is to start and the maintenance power supply, and system is run well; Shutdown is to detect the shutdown of touch-switch action, preserves necessary system information, and powered-down.One-touch power on-off modes is simple to operate owing to having, but advantages such as status information safe storage have become one of main power on-off modes of end product at present, for example: mobile phone, router, digital camera etc.
The one-touch switching on and shutting down in existing terminal mainly adopt dual mode to realize: a kind of is power-supply management system through special use, interrupts with the mode triggering system of button, makes system's entering work or dormancy holding state.A kind of is to adopt transistor (FET) and microprocessor to constitute certain self-locking logic; Realize that logical circuit triggers self-locking; Microprocessor then detects the shutdown action, and carries out power-off operation through the output level of configuration its specific GPIO (general input and output) pin.
Find that in practice there is following shortcoming in prior art:
For first kind of implementation of prior art, owing to adopt the power source special management system, for the end product of speaking more greatly, limitation is very big, cost is high, can't promote.Then there is fatal defective in second kind of implementation, when system since upgrade software or dispose a certain function after, often need software restarting, but at this moment microprocessor keeps the pin output level of power supply status to change, system power supply will be closed.Therefore need the manual work power supply that presses switch to open once more, system could accomplish restarting process.
Summary of the invention
Deficiency to above technology; Goal of the invention of the present invention is to provide a kind of microprocessor that prevents to restart the switching on and shutting down implementation method of power down; Bond switching machine circuit through the method design; Can thoroughly solve, in the one-touch switching on and shutting down of building through the transistor microprocessor because microprocessor program is restarted system's power down problem of being brought.
The technical scheme that the inventive method is taked is:
A kind of microprocessor that prevents is restarted the switching on and shutting down implementation method and the device of power down, and the described microprocessor that prevents is restarted the switching on and shutting down device of power down, comprises switch, power supply fork lock, power supply indication, supply convertor and microprocessor etc.
Described switch comprises the external power source input end, closes machine testing output terminal, output enable end, and described power input connects external power source, closes the machine testing output terminal and connects power supply fork lock input end.The output enable end connects the Enable Pin of supply convertor, the work of control supply convertor.Pass machine testing input end is connected in the pass machine testing output of switch.The working power input is by the power voltage supply of supply convertor output.
Described power supply fork lock comprises pass machine testing input, output enable, working power input, closes machine testing output.Pass machine testing input is connected in the pass machine testing output of switch.The working power input is by the power voltage supply of supply convertor output.Close machine testing and export the PWR_OFF_N pin that is connected in microprocessor, for microprocessor provides the shutdown detection signal.
Described power supply indication comprises output enable end, PWR_GOOD_N input, working power input.The output enable end connects the Enable Pin of supply convertor.The PWR_GOOD_N input connects the PWR_GOOD_N pin of microprocessor, and the working power input is by the power voltage supply of supply convertor output, and supply convertor is closed the back inner LED1 power light of power supply status indication and extinguished.
Described microprocessor comprises PWR_OFF_N input, PWR_GOOD_N output, working power input.The PWR_OFF_N input connects closes machine testing output.PWR_GOOD_N output connects the PWR_GOOD_N input of power supply indication, and microprocessor is put PWR_GOOD_N and is output as inactive level after having preserved and having closed machine information.
Described supply convertor comprises voltage output, voltage input, enables control.Voltage output is the voltage output end of supply convertor, and output voltage is connected to microprocessor, power supply indication, power input, for their work provides electric energy.The voltage input connects external input voltage, and enabling to control is the work control pin of supply convertor, supply convertor work when this pin level is effective, and when this control level was invalid, supply convertor was not worked.
The method of the one-touch switching on and shutting down of the present invention may further comprise the steps:
The outside input of described connection power supply is pressed touch-switch, on-off circuit output significant level, power converting circuit startup work, power supply fork lock circuit output this moment inactive level;
Microprocessor begins to start the operation boot program, and micro processor leg PWR_GOOD_N exports significant level, and the power light of power indicating circuit is bright, and the prompting user starts shooting;
After touch-switch breaks off, on-off circuit output inactive level, the enable of supply convertor continues to be held open because of the significant level of PWR_GOOD_N output.Behind hundreds of milliseconds, state retaining circuit output significant level, the opening of locking supply convertor, start is accomplished.
Under the processor operate as normal, press touch-switch, on-off circuit output significant level is kept the state that supply convertor is opened, power supply fork lock circuit output inactive level, the PWR_OFF_N pin of microprocessor detects the shutdown significant level;
The microprocessor shutdown programm that brings into operation, after the preservation state information, micro processor leg PWR_GOOD_N exports inactive level, and power light goes out in the power indicating circuit, indicating circuit output inactive level, the prompting user shuts down;
After touch-switch breaks off, on-off circuit output inactive level, supply convertor does not have effective enable signal, and supply convertor changes closed condition over to, and shutdown is accomplished.
Microprocessor of the present invention is restarted the method for the power supply maintenance of power down, may further comprise the steps:
Under the microprocessor operate as normal, in the time of after configuration-system parameter or software upgrading, need restarting, micro processor leg PWR_GOOD_N possibly export effectively or inactive level;
When micro processor leg PWR_GOOD_N output inactive level, this moment, the power supply indication was output as inactive level, and level is constant but power supply fork lock circuit is remained valid, so the enable signal of supply convertor is still kept significant level;
Supply convertor is operated in opening, and it is stable that power supply of microprocessor keeps, and accomplishes restarting process smoothly;
The invention has the beneficial effects as follows that through the terminal one bond switching machine of this method design, circuit is simple, function-stable is reliable, is easy on most microprocessor platform, realize, is fit to generally promote.
Description of drawings
Fig. 1 is the structural representation of the one-touch switching on and shutting down device of the present invention;
Fig. 2 is the method flow diagram of the one-touch start of the present invention;
Fig. 3 is the method flow diagram of the one-touch shutdown of the present invention;
The method flow diagram that power supply when Fig. 4 is restarted for microprocessor of the present invention keeps;
Fig. 5 is the circuit diagram of the one-touch switching on and shutting down of the present invention.
Embodiment
Below in conjunction with accompanying drawing and instance the present invention is further specified:
As shown in Figure 1, the embodiment of the invention realizes the structural representation of one-touch switching on and shutting down device, comprising: switch 11, power supply fork lock 12, power supply indication 14, microprocessor 13, supply convertor 15.
Switch 11 comprises external power source input end 111, closes machine testing output 112, output enable end 113.Power input 111 connects external power source, closes machine testing and exports the pass machine testing input end 121 that 112 connection status keep, and whether output enable end 113 connects the Enable Pin of supply convertor 15, controlling supply convertor 15 and working.
Power supply fork lock 12 comprises pass machine testing input 121, output enable 122, working power 124, closes machine testing output 123.Pass machine testing input 121 is connected in 11 pass machine testing output 112; When 121 inputs during an inactive level, power supply fork lock 12 internal capacitances begin to charge behind hundreds of milliseconds, output enable end 122 output significant levels; Keep supply convertor 15 duties; When significant level of 121 inputs, power supply fork lock 12 internal capacitances are by the short circuit rapid discharge, and output enable end 122 is exported inactive levels.Working power 124 is by voltage 2 power supplies of supply convertor 15 outputs, and power supply fork lock 12 can't be worked after supply convertor 15 is closed.Pass machine testing output 123 is connected in the PWR_OFF_N pin of microprocessor 13, for microprocessor 13 provides the shutdown detection signal.
As shown in Figure 2, the embodiment of the invention realizes the method flow diagram of one-touch start, comprises the steps:
Step 201: connecting outside input supply voltage is voltage 1, presses touch-switch, on-off circuit output significant level; Power converting circuit startup work, output voltage 2 is because touch-switch is in down state always; Power supply fork lock circuit internal capacitance can't be charged, and it is output as inactive level.
Step 202: microprocessor starts the operation boot program; After the start process was accomplished, micro processor leg PWR_GOOD_N exported significant level, and power light is bright in the power indicating circuit; Power indicating circuit output significant level; Enable the enable of supply convertor, point out the user to start shooting simultaneously, can unclamp touch-switch.
Step 203: after touch-switch breaks off, on-off circuit output inactive level, the enable of supply convertor continues to be held open because of the significant level of the PWR_GOOD_N pin output of microprocessor.Because the disconnection of touch-switch, electric capacity begins charging in the power supply fork lock circuit, behind hundreds of milliseconds, and power supply fork lock circuit output significant level, the opening of locking supply convertor, start is accomplished.
As shown in Figure 3, for the embodiment of the invention realizes comprising the steps: the process flow diagram of the method for one-touch shutdown
Step 301: press touch-switch; On-off circuit output significant level; Keep the state that supply convertor is opened, the electric capacity of power supply fork lock circuit inside is by rapid discharge simultaneously, and power supply is pitched lock circuit output inactive level; Remove the locking to the supply convertor enabled, the PWR_OFF_N pin of microprocessor detects the shutdown significant level.
Step 302: after process software disappears and trembles processing; The microprocessor shutdown programm that brings into operation, after the preservation state information, micro processor leg PWR_GOOD_N exports inactive level; Power light goes out in the power indicating circuit; Power indicating circuit output inactive level, the prompting user shuts down, can unclamp touch-switch.
Step 303: after touch-switch breaks off, start trigger circuit output inactive level, supply convertor does not have effective enable signal, and supply convertor changes closed condition over to, and shutdown is accomplished.
Method flow diagram as shown in Figure 4, that the power supply when realizing that for the embodiment of the invention microprocessor is restarted keeps comprises the steps:
Step 401: under the microprocessor operate as normal, in the time of after configuration-system parameter or software upgrading, need restarting, micro processor leg PWR_GOOD_N possibly export effectively or inactive level.
Step 402: when micro processor leg PWR_GOOD_N output inactive level; The power supply indication is output as inactive level, and power light goes out, but power supply fork lock circuit is because internal capacitance is full of; The level of remaining valid output, so the enable signal of supply convertor is kept significant level.
Step 403: supply convertor is operated in opening, and it is stable that power supply of microprocessor keeps.
Step 404: when micro processor leg PWR_GOOD_N output significant level; The power supply indication is output as significant level, and power light is bright, and power supply fork lock circuit is because internal capacitance has been full of; Output also is significant level, so the enable signal of supply convertor is kept significant level.
Step 405: supply convertor is operated in opening, and it is stable that power supply of microprocessor keeps.
As shown in Figure 5; The one-touch on/off circuit synoptic diagram that is applied to realize in the specific product for the embodiment of the invention; Adopt the mentality of designing of software and hardware combining, startup and shutdown all need software to participate in handling, the false triggering that this kind mode can effectively be eliminated various shake and brought.
In Fig. 5, external power source VCC_5V is connected to the source S of input end and the switch triggering circuit Q1 (PMOS) of supply convertor DC-DC, when start, presses touch-switch SW, and the grid G of Q1 becomes low level; The Q1 conducting, drain D becomes high level, starts DC-DC work output 3.3V voltage (VDD_3V3); Because SW is in and pushes conducting state, C1 is discharged by low-resistance, and Q3 (PMOS) ends; Drain D is a high-impedance state, and MCU (microprocessor) obtains the 3.3V power supply, and the operation boot program is changed to low level with pin PWR_GOOD_N; Q4 (PMOS) conducting, drain D output high level, power light LED1 is bright.Unclamp touch-switch SW, Q1 ends.The Enable Pin that DC-DC is kept in the D5 conducting is a high level, and DC-DC keeps work.C1 slowly charges through R3, behind the hundreds of millisecond C1 voltage greater than 2.4V, Q2 and Q3 conducting in succession, Q3 drain D output high level, start process is accomplished.
In the MCU operate as normal, press touch-switch SW, C1 is through D1, SW rapid discharge, and Q2 and Q3 end in succession when the C1 voltage is lower than 2.4V, and the Q3 drain D becomes high-impedance state.Because the conducting of SW, the PWR_OFF_N pin of MCU by drop-down be low level, MCU this low level of identification behind the preservation operation information, is put high level with the PWR_GOOD_N pin after software disappears trembles.Q4 ends, and power light LED1 extinguishes, and reminds the user can unclamp touch-switch SW.This moment, Q3 and Q4 were cut-off state, and only Q1 keeps the opening of DC-DC owing to push SW and conducting.After SW broke off, Q1 became and ends, and the enable signal of DC-DC is dragged down by pull down resistor R7, and DC-DC quits work, the system closing power supply.
In MCU work, disposed systematic parameter or the program of having upgraded, MCU gets into rebooting status.When the PWR_GOOD_N pin became high level at random, Q4 ended, and power light LED1 extinguishes.But the C1 voltage is greater than 2.4V, and Q2 and Q3 keep conducting, the high level of Q3 drain D output, and the D4 conducting, the enable signal of keeping DC-DC is a high level, therefore DC-DC keeps current opening.Stable output (VDD_3V3) is accomplished the MCU restarting process for system provides power supply.
The foregoing description provides to those of ordinary skills and realizes or use of the present invention; Those of ordinary skills can be under the situation that does not break away from invention thought of the present invention; The foregoing description is made various modifications or variation; Thereby protection scope of the present invention do not limit by the foregoing description, and should be the maximum magnitude that meets the inventive features that claims mention.
Claims (10)
1. one kind prevents that microprocessor from restarting the switching on and shutting down implementation method and the device of power down; Comprise switch, power supply fork lock, power supply indication, supply convertor and microprocessor; It is characterized in that: described switch comprises the external power source input end, closes machine testing output, output enable end; Power input connects external power source, closes machine testing output and connects power supply fork lock input end; The output enable end connects the Enable Pin of supply convertor.
2. a kind of microprocessor that prevents according to claim 1 is restarted the switching on and shutting down implementation method and the device of power down; It is characterized in that: described power supply fork lock comprises pass machine testing input, output enable, working power input, closes machine testing output, closes the pass machine testing output that machine testing input is connected in switch; The working power input is by the power voltage supply of supply convertor output; Close machine testing and export the PWR_OFF_N pin that is connected in microprocessor, for microprocessor provides the shutdown detection signal.
3. a kind of microprocessor that prevents according to claim 1 is restarted the switching on and shutting down implementation method and the device of power down; It is characterized in that: described power supply indication comprises output enable, PWR_GOOD_N input, working power input, and output enable connects the Enable Pin of supply convertor; The PWR_GOOD_N input connects the PWR_GOOD_N output of microprocessor; The working power input is by the power voltage supply of supply convertor output; Supply convertor is closed the back inner LED1 power light of power supply indication and is extinguished.
4. a kind of microprocessor that prevents according to claim 1 is restarted the switching on and shutting down implementation method and the device of power down; It is characterized in that: described supply convertor comprises voltage output, voltage input, enables control; Voltage output is the voltage output end of supply convertor, and output voltage is connected to the power input of microprocessor, power supply indication, power supply fork lock; The voltage input connects external input voltage; Enabling to control is the work control pin of supply convertor, supply convertor work when this pin level is effective.
5. a kind of microprocessor that prevents according to claim 1 is restarted the switching on and shutting down implementation method and the device of power down; It is characterized in that: described microprocessor comprises PWR_OFF_N input, PWR_GOOD_N output, working power input, and the PWR_OFF_N input connects the pass machine testing output of power supply fork lock; PWR_GOOD_N output connects the PWR_GOOD_N input of power supply indication; Microprocessor is put PWR_GOOD_N and is output as inactive level after having preserved and having closed machine information.
6. a kind of microprocessor that prevents according to claim 1 is restarted the switching on and shutting down implementation method and the device of power down; It is characterized in that: described switch one end links to each other with grid, the isolating diode of current-limiting resistance R1, P-channel field-effect transistor (PEFT) pipe Q1, and the other end connects public ground; P-channel field-effect transistor (PEFT) pipe Q1, source electrode connects external input voltage, and grid connects switch one end, and drain electrode is connected to the supply convertor Enable Pin through current-limiting resistance R4, when touch-switch is closed, P-channel field-effect transistor (PEFT) pipe Q1 conducting, drain electrode output significant level.
7. a kind of microprocessor that prevents according to claim 1 is restarted the switching on and shutting down implementation method and the device of power down; It is characterized in that: described power supply indication; Current-limiting resistance R8 one end is connected with the supply convertor output terminal, and an end connects microprocessor PWR_GOOD_N pin; P-channel field-effect transistor (PEFT) pipe Q4; Source electrode is connected with the supply convertor output terminal, and grid connects the PWR_GOOD_N pin, drains one the road to be connected to the supply convertor Enable Pin; Another road connects power light LED1 through current-limiting resistance R9; When PWR_GOOD_N is effective, P-channel field-effect transistor (PEFT) pipe Q4 conducting, drain electrode output significant level.
8. a kind of microprocessor that prevents according to claim 1 is restarted the switching on and shutting down implementation method and the device of power down, it is characterized in that: described power supply fork lock, and isolating diode D1 one end connects touch-switch, and the other end connects the grid of Q2; Delay capacitor C1, an end connects the grid of current-limiting resistance R3 and Q2, and the other end connects public ground; The Connect Power reset output terminal of reseting circuit U1 of current-limiting resistance R3, an end, the other end connects C1; N channel field-effect pipe Q2, grid connects C1 one end, and source electrode connects public ground, and drain electrode connects the grid of Q3; P-channel field-effect transistor (PEFT) pipe Q3, grid connect the drain electrode of Q2, the Connect Power reset output terminal of reseting circuit U1 of source electrode, and drain electrode is connected to the supply convertor Enable Pin through isolating diode D4; Electrification reset integrated circuit U1, input end connects the supply convertor output terminal, and output terminal one tunnel connects the source electrode of P-channel field-effect transistor (PEFT) pipe Q3, and charging to C1 through R3 in another road, uses electrification reset integrated circuit U1 to the power supply of power supply fork latching segment.
9. a kind of microprocessor that prevents according to claim 1 is restarted the switching on and shutting down implementation method and the device of power down, it is characterized in that: described this switching on and shutting down implementation method:
1) conducting touch-switch, on-off circuit output significant level, power converting circuit startup work, power supply fork lock circuit output this moment inactive level;
2) microprocessor starts the operation boot program, and micro processor leg PWR_GOOD_N exports significant level, power indicating circuit output significant level, and power light is bright;
3) after touch-switch breaks off, on-off circuit output inactive level, the enable of supply convertor continues to be held open because of the significant level of power indicating circuit output;
4) through behind hundreds of milliseconds, power supply fork lock circuit output significant level, the opening of locking supply convertor, the start flow process finishes;
5) conducting touch-switch, on-off circuit output significant level is kept the state that supply convertor is opened, power supply fork lock circuit output inactive level, the PWR_OFF_N pin of microprocessor detects the shutdown significant level;
6) microprocessor operation shutdown programm, after the preservation state information, micro processor leg PWR_GOOD_N exports inactive level, and power light goes out in the power indicating circuit, indicating circuit output inactive level;
7) after touch-switch breaks off, on-off circuit output inactive level, supply convertor does not have effective enable signal, and supply convertor changes closed condition over to, and shutdown process is accomplished.
10. a kind of microprocessor that prevents according to claim 1 is restarted the switching on and shutting down implementation method and the device of power down; It is characterized in that: when described this implementation method was restarted after configuration-system parameter or software upgrading, micro processor leg PWR_GOOD_N possibly export effectively or inactive level; When micro processor leg PWR_GOOD_N output inactive level, this moment, the power supply indication was output as inactive level, and level is constant but power supply fork lock circuit is remained valid, so the enable signal of supply convertor is kept significant level; Supply convertor is operated in opening, and it is stable that power supply of microprocessor keeps.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105945964A CN102541228A (en) | 2010-12-16 | 2010-12-16 | Startup and shutdown implementing method and device capable of preventing restart power failure of microprocessor |
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| CN2010105945964A CN102541228A (en) | 2010-12-16 | 2010-12-16 | Startup and shutdown implementing method and device capable of preventing restart power failure of microprocessor |
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| CN105759681A (en) * | 2016-01-28 | 2016-07-13 | 深圳创维汽车智能有限公司 | Anomaly avoidance device, and control system and method of avoiding anomaly of vehicle-mounted device |
| CN106610714A (en) * | 2015-10-21 | 2017-05-03 | 中兴通讯股份有限公司 | Switch control circuit and method for terminal |
| CN109510284A (en) * | 2019-01-02 | 2019-03-22 | 张家港华捷电子有限公司 | A kind of lithium electric protection electronic switch |
| CN109885031A (en) * | 2019-03-14 | 2019-06-14 | 四川海特亚美航空技术有限公司 | The power down indicating fault holding circuit of aero-engine APU CTL |
| CN113467313A (en) * | 2021-07-15 | 2021-10-01 | 上海市特种设备监督检验技术研究院 | Startup and shutdown circuit for battery power supply and startup and shutdown time sequence design method |
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| CN113467313A (en) * | 2021-07-15 | 2021-10-01 | 上海市特种设备监督检验技术研究院 | Startup and shutdown circuit for battery power supply and startup and shutdown time sequence design method |
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Application publication date: 20120704 |