CN100403777C - Method of digital system low-voltage stabilizing work - Google Patents
Method of digital system low-voltage stabilizing work Download PDFInfo
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- CN100403777C CN100403777C CNB2006100356219A CN200610035621A CN100403777C CN 100403777 C CN100403777 C CN 100403777C CN B2006100356219 A CNB2006100356219 A CN B2006100356219A CN 200610035621 A CN200610035621 A CN 200610035621A CN 100403777 C CN100403777 C CN 100403777C
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Abstract
A method for carrying out stable operation on low voltage of digital system includes judging whether power supply voltage is turn-off voltage or near to turn-off voltage or not and entering re-electricity-saving load mode if it is or otherwise continuously judging turn-off voltage state, controlling LCD backlight PWM frequency or duty ratio, finalizing storage file or corresponding function of each mode, judging again whether power supply voltage is turn-off voltage or near to turn-off voltage or not and entering system switching off course if it is or otherwise returning to re-electricity- saving load mode.
Description
[technical field]
The present invention relates to a kind of control method of numeral system, especially relates to a kind of method that keeps numeral system at low-voltage stabilizing work.
[background technology]
In recent years, CCD imager imaging is carried out signal processing and deposited recording medium in, for example the Electrofax of fast storage is universal day by day, and particularly integral body is furnished with for example electronic flash equipment, and the Electrofax of various annexes such as LCD monitor enjoys favor.
This Electrofax generally adopts battery and storage battery etc. as power supply, thereby, based on the requirement of battery itself, need reduce the load of this battery as far as possible than the long life, the variation of its cell voltage also is restricted.For the assembling electronic flash equipment, the Electrofax of LCD monitor etc., receive the electronic flash equipment of power from battery, the for example CCD imager of the load of LCD monitor etc. and this camera part and original load meeting of signal processing circuit produce a problem deserving of attention, for example, for electronic flash equipment, when the discharge tube of electronic flash equipment is luminous, needing big electric current therefrom passes through, like this, luminous or for next time between luminous non-light emission period of preparing, when the capacitor charging that electronic flash is used, big electric current will and produce big load from this battery outflow, to the LCD monitor too, when showing an image, need apply a predetermined driving voltage consistently.
As mentioned above, when the intrinsic load of electronic flash equipment and LCD monitor even load and camera and battery are connected, cell voltage will obviously descend.When keeping the quantity of electric charge of abundance in the battery, slight applied load can not cause any problem significantly, and compare with the situation of maintenance sufficient charge amount in the battery, when keeping a little charge in the battery, output voltage also will reduce when not adding any load, if at this moment apply big load, then cell voltage very easily produces big pressure drop.
The camera section branch comprises that all kinds integrated circuit and microprocesso simulate and digital processing, so, when cell voltage significantly descends, voltage will be reduced under the lower limit that makes integrated circuit and microprocesso normal working voltage, and can not carry out normal signal processing.
Therefore, provide a kind of numeral system that is used for, make it real in necessary in the control method that low-voltage keeps steady operation to avoid circuit to wreck.
[summary of the invention]
The method that the purpose of this invention is to provide a kind of digital system low-voltage stabilizing work.
At first; shutoff voltage is divided into two kinds of hardware shutoff voltage (minimum operating voltage) and software switching-off voltages (system closedown voltage); software switching-off voltage is to be used for protection system, avoids system to cause damage because of abnormal outage, therefore at first needs to test out software switching-off voltage.
Test out numeral system shutoff voltage step it comprise:
(i), by constantly reducing input voltage, measure each output voltage respectively, draw the hardware shutoff voltage of numeral system;
(ii), with system's normal running program setting condition, further collect the data of using the battery system change in voltage, till hardware turn-offs, draw the set point of one group of shutoff voltage, decision software switching-off voltage.
We know that battery behavior is different with the difference of temperature in addition, and certainly, the shutoff voltage value when we also can use normal temperature confirms when high low temperature more whether battery life is up to specification.If can not be up to specification, this still need at other repeating step of high low temperature time-division (ii) collect the data of using the battery system change in voltage under the different temperatures situation, till hardware turn-offs, and the software switching-off magnitude of voltage in the time of can drawing different temperatures.
After drawing software switching-off voltage, according to step data (ii), the separation magnitude of voltage when further the decision battery shows, promptly battery shows 2 lattice, 1 lattice and full magnitude of voltage when empty, and can be rough be evaluated at the number clapped under this condition.
Below mainly be next, mainly need to prove at the minimum shutoff voltage of determining default: near or when reaching the shutoff voltage value, finish work at present for the assurance system can stablize, normally enter the shutdown programm of system at once.And, need partly do some to the power consumption of system to adjust, and then prolong the battery life of camera here in order to finish the work (particularly when carrying out the archives storage) that system is handling.
This machine of initial analysis is fit to the load of shutoff, CMOS for example, LCD, LENS, the corresponding power consumption current conditions that could switching off load of the power control switch of SPEAKER etc. then can tentatively be determined under various pattern, when system reaches the shutoff voltage value, the load that can turn-off is also known the power consumption situation of each load blocks simultaneously, so that know savable electric weight.
On this basis as can be known, can be in shutoff voltage or during near shutoff voltage, reach the purpose of power consumption by control LCD in system.Finish storage at preview mode for guaranteeing the low-voltage archives of taking pictures, when camera detects shutdown voltage, this moment controls LCD PWM frequency backlight or duty ratio is turned down, be that (will save more than the nearly 20mA electric current) turned down in LCD brightness, after deposit is finished, confirm that again battery electric quantity further determines whether shutdown again.
In order to realize the object of the invention, adopt following technical scheme:
The method of this digital system low-voltage stabilizing work, it specifically may further comprise the steps:
(1), under the situation that each pattern normal function is handled, judge whether shutoff voltage or of supply voltage near shutoff voltage, be then to enter for second step, otherwise continue the judgement voltage status;
(2), enter the power saving load model;
(3), control LCD PWM frequency backlight or duty ratio;
(4), finish memory file or each pattern corresponding function;
(5), once more judge whether shutoff voltage or of supply voltage, be then to enter shutdown programm, otherwise return step (2) near shutoff voltage.
In addition, for avoiding battery low-voltage, low current start, the situation of restarting that system does not stop, can in the start sequential, add the charging capacitor action of charging, so both be the charging capacitor charging, can have overcome the problem of restarting that the low current boot system do not stop again, simultaneously, only provide under enough electric currents and start shooting, could guarantee start back system held operate as normal in low-voltage.
When start enters each pattern normal function and handles, charging capacitor charged and comprise the steps:
(a), the start, charging capacitor is charged;
(b), judge whether shutoff voltage or of supply voltage near shutoff voltage, be then to enter shutdown programm, handle otherwise enter each pattern normal function, and continue to judge voltage status.
Compared with prior art, the present invention has following beneficial effect:
The method of digital system low-voltage stabilizing work of the present invention makes numeral system the useful life that prolongs battery, and numeral system can steady operation and safeguards system safety in low-voltage.
[description of drawings]
Fig. 1 is the structured flowchart of digital camera;
Fig. 2 is digital camera input voltage and output voltage graph of a relation;
Fig. 3 is the battery system change in voltage graph of a relation of digital camera;
Fig. 4 is the flow chart of the method for digital system low-voltage stabilizing work of the present invention;
Fig. 5 is the flow chart that adds in the start sequential among the present invention charging capacitor charging action.
[embodiment]
Please refer to Fig. 1, the F/W program leaves among the FLASH IC (flash chip) among the figure, and the boot of start back DSP (Digital Signal Processing, Digital Signal Processing) operation is moved the F/W program to DRAM (dynamic random access memory) and operation.DSP can carry out the image mode switching according to user's operation like this, if need absorb extraneous image (DSP comes the perception external world by controls lens LENS and Charged Coupled Device CMOS) at this pattern DSP, the luminous intensity of Charged Coupled Device institute perception is converted into the signal of telecommunication like this, carry out image processing through DSP at DRAM again, finish a pictures at last and be stored among the FLASH IC.Certainly DSP also needs the luminous intensity according to the external world, and whether decision needs to control flash lamp component is carried out light filling.Whether before carrying out the photoflash lamp light filling, needing to detect charging capacitor has enough electric weight, otherwise DSP need send charging instruction and charge to charging circuit.All here operation informations or do not need flash of light etc. all can show by display lcd and see that the sound that sends with loud speaker SPEAKER hears.
Please refer to Fig. 2 and Fig. 3, at first, by the input voltage (using the power supply unit test) of continuous reduction digital camera, measure each input voltage respectively, draw data as shown in Figure 1, the hardware shutoff voltage of numeral system is 1.8～1.9V as can be known.Then with system's normal running program setting condition, further collect the data of using the battery system change in voltage, with the digital camera is example, condition enactment is that LCD opens, 50% flash of light (i.e. flash of light, one does not glisten), per 30 second beats, one sheet photo every 30 seconds read-out voltage values, is write down magnitude of voltage, take pictures continuously till hardware turn-offs, draw the set point of one group of shutoff voltage, decision software switching-off voltage, as shown in Figure 2, wherein the suggestion of the shutoff voltage of alkaline battery is for about 2.2V as can be known, and the suggestion of the shutoff voltage of rechargeable battery is made as about 2.1V.
We know that battery behavior is different with the difference of temperature in addition, and certainly, the shutoff voltage value when we also can use normal temperature confirms when high low temperature more whether battery life is up to specification.If can not be up to specification, this still need collect the data of using the battery system change in voltage in the other retest of high low temperature time-division under the different temperatures situation, till hardware turn-offs, and the software switching-off magnitude of voltage in the time of can drawing different temperatures.After drawing software switching-off voltage, according to above-mentioned data, the separation magnitude of voltage when further the decision battery shows, promptly battery shows 2 lattice, 1 lattice and full magnitude of voltage when empty, and can be rough be evaluated at the number clapped under this condition.
After determining the minimum shutoff voltage of default, next, analyze the load that this machine is fit to shutoff, CMOS for example, LCD, LENS, the corresponding power consumption current conditions that could switching off load of the power control switch of SPEAKER etc., as shown in the table:
| The DSP switching off load | The power consumption electric current | Whether preview mode can turn-off | Whether play mode can turn-off |
| CMOS | 180mA | NO | YES |
| LCD | 150mA | NO | NO |
| LENS | 120mA | NO | YES |
| SPEAKER | 100mA | YES | NO |
| Charging |
0～500mA | NO | YES |
As can be seen from the above table, the corresponding load of can not turn-offing jointly of preview mode and play mode is LCD, since move in system and all can't turn-off corresponding load LCD in each pattern, then be in shutoff voltage or during near shutoff voltage, can reach control power consumption purpose by control LCD in system.Finish storage at preview mode for guaranteeing the low-voltage archives of taking pictures, when camera detects shutdown voltage, this moment controls LCD PWM frequency backlight or duty ratio is turned down, be that (will save more than the nearly 20mA electric current) turned down in LCD brightness, after deposit is finished, confirm that again battery electric quantity further determines whether shutdown again.
See also Fig. 4, concrete steps are as follows:
(1), under the situation that each pattern normal function is handled, judge whether shutoff voltage or of supply voltage near shutoff voltage, be then to enter for second step, otherwise continue the judgement voltage status;
(2), enter the power saving load model;
(3), control LCD PWM frequency backlight or duty ratio;
(4), finish memory file or each pattern corresponding function;
(5), once more judge whether shutoff voltage or of supply voltage, be then to enter shutdown programm, otherwise return step (2) near shutoff voltage.
In addition, from above-mentioned each load power consumption amperometry, maximum current 500mA to the charging capacitor charging has accounted for more than 80% of system's power consumption, so, for avoiding battery low-voltage, the low current start, the situation of restarting that system does not stop, can in the start sequential, add the charging capacitor action of charging, charging current can make electric current near maximum 500mA from 200ms～500ms, so both be the charging capacitor charging, can have overcome the problem of restarting that the low current boot system do not stop again, simultaneously, only provide under enough electric currents and start shooting, could guarantee start back system held operate as normal in low-voltage.
See also Fig. 5, when start enters each pattern normal function and handles charging capacitor being charged comprises the steps:
(a), the start, charging capacitor is charged;
(b), judge whether shutoff voltage or of supply voltage near shutoff voltage, be then to enter shutdown programm, handle otherwise enter each pattern normal function, and continue to judge voltage status.
The above is preferred embodiment of the present invention only, and protection scope of the present invention is not limited thereto, and those of skill in the art are any to be included within protection range of the present invention based on non-material change on the technical solution of the present invention.
Claims (5)
1. the method for a digital system low-voltage stabilizing work, it may further comprise the steps:
(1), under the situation that each pattern normal function is handled, judge whether shutoff voltage or of supply voltage near shutoff voltage, be then to enter for second step, otherwise continue the judgement voltage status;
(2), enter the power saving load model;
(3), control LCD PWM frequency backlight or duty ratio;
(4), finish memory file or each pattern corresponding function;
(5), once more judge whether shutoff voltage or of supply voltage, be then to enter shutdown programm, otherwise return step (2) near shutoff voltage.
2. the method for digital system low-voltage stabilizing work as claimed in claim 1 is characterized in that, enters in start to comprise the steps: when each pattern normal function is handled
(a), the start, charging capacitor is charged;
(b), judge whether shutoff voltage or of supply voltage near shutoff voltage, be then to enter shutdown programm, handle otherwise enter each pattern normal function, and continue to judge voltage status.
3. the method for digital system low-voltage stabilizing work as claimed in claim 1 is characterized in that, in the preceding step that also comprises the shutoff voltage that tests out numeral system of step (1), it comprises:
(i), by constantly reducing input voltage, measure each output voltage respectively, draw the hardware shutoff voltage of numeral system;
(ii), with system's normal running program setting condition, further collect the data of using the battery system change in voltage, till hardware turn-offs, draw the set point of one group of shutoff voltage, decision software switching-off voltage.
4. the method for digital system low-voltage stabilizing work as claimed in claim 3, it is characterized in that, step (ii) in, under the different temperatures situation, collect to use the data of battery system change in voltage, till hardware turn-offs, the software switching-off magnitude of voltage in the time of can drawing different temperatures.
5. the method for digital system low-voltage stabilizing work as claimed in claim 3 is characterized in that, after drawing software switching-off voltage, according to step data (ii), further determines the separation magnitude of voltage when battery shows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100356219A CN100403777C (en) | 2006-05-26 | 2006-05-26 | Method of digital system low-voltage stabilizing work |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100356219A CN100403777C (en) | 2006-05-26 | 2006-05-26 | Method of digital system low-voltage stabilizing work |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1889634A CN1889634A (en) | 2007-01-03 |
| CN100403777C true CN100403777C (en) | 2008-07-16 |
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| CNB2006100356219A Expired - Fee Related CN100403777C (en) | 2006-05-26 | 2006-05-26 | Method of digital system low-voltage stabilizing work |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105144683B (en) * | 2013-02-28 | 2019-08-09 | 株式会社尼康 | Electronic equipment |
| CN111379465A (en) * | 2018-12-30 | 2020-07-07 | 云丁网络技术(北京)有限公司 | Door lock power supply control system and method |
| CN111477182B (en) * | 2019-01-23 | 2022-03-04 | 纬联电子科技(中山)有限公司 | Display device and power-off control method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63256003A (en) * | 1987-04-13 | 1988-10-24 | Canon Inc | Oscillation device |
| CN1227675A (en) * | 1996-08-05 | 1999-09-01 | 三洋电机株式会社 | Device for detecting residual capacity of battery |
| CN1365020A (en) * | 2001-01-11 | 2002-08-21 | 金宝电子工业股份有限公司 | Device and method for predicting cell output voltage of digital camera |
| US20040113600A1 (en) * | 2002-11-14 | 2004-06-17 | Rohm Co., Ltd. | Switching power supply unit and controller IC thereof |
| CN1690896A (en) * | 2004-04-15 | 2005-11-02 | 美国凹凸微系有限公司 | Power supply management device for digital unit, and system and method therefor |
-
2006
- 2006-05-26 CN CNB2006100356219A patent/CN100403777C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63256003A (en) * | 1987-04-13 | 1988-10-24 | Canon Inc | Oscillation device |
| CN1227675A (en) * | 1996-08-05 | 1999-09-01 | 三洋电机株式会社 | Device for detecting residual capacity of battery |
| CN1365020A (en) * | 2001-01-11 | 2002-08-21 | 金宝电子工业股份有限公司 | Device and method for predicting cell output voltage of digital camera |
| US20040113600A1 (en) * | 2002-11-14 | 2004-06-17 | Rohm Co., Ltd. | Switching power supply unit and controller IC thereof |
| CN1690896A (en) * | 2004-04-15 | 2005-11-02 | 美国凹凸微系有限公司 | Power supply management device for digital unit, and system and method therefor |
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| CN1889634A (en) | 2007-01-03 |
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