CN204790439U - Improve intelligent control device that ammeter resets repeatedly under low pressure condition - Google Patents
Improve intelligent control device that ammeter resets repeatedly under low pressure condition Download PDFInfo
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- CN204790439U CN204790439U CN201520506682.3U CN201520506682U CN204790439U CN 204790439 U CN204790439 U CN 204790439U CN 201520506682 U CN201520506682 U CN 201520506682U CN 204790439 U CN204790439 U CN 204790439U
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Abstract
The utility model provides an improve intelligent control device that ammeter resets repeatedly under low pressure condition, a triode Q1 is connected to inside battery at the ammeter, inside battery is anodal to be connected with triode Q1 projecting pole, parallelly connected first resistance R1 is connected to triode Q1's collecting electrode, second resistance R2, first resistance R1, second resistance R2 other end ground connection, third resistance R3 is connected to triode Q1's base, third resistance R3 again with the ammeter in the singlechip LOAD_CTR mouth established be connected, the switching is controlled to an ordinary IO mouth that is the singlechip in the ammeter. Beneficial effect: the required energy value that provides because the ammeter is normally worked, and the difference that exists, and the work blind area of the ammeter that produces have been eliminated completely between year characteristic of ammeter power area. Make in full voltage range, any one magnitude of voltage is inputed for the ammeter, and the state of ammeter all is stable clear and definite. Can there be the phenomenon that resets repeatedly. The whole life of ammeter has been guaranteed to the inside battery of protection ammeter.
Description
Technical field
The utility model belongs to electric-power metering instrument field, relates to a kind of intelligent controlling device improving ammeter and repeatedly reset under low voltage situations.
Background technology
In electric-power metering instrument industry, the Yield compariof ammeter is large, metering precision directly has influence on power department to electricity consumption quantitative statistics, and power consumption is directly just relevant with the electricity charge that people pay, so be also in area in anti-exhibition energetically and country at some, as Southeast Asia, the areas such as South America, have some or production and the living cost of tissue in order to reduce development, to try every possible means stealing, wherein a kind of stealing mode reduces ammeter input terminal voltage, just as this technical scheme will be said, ammeter is made to be in the boundary strip started with non-start up condition, i.e. reset mode repeatedly, make ammeter backlight flicker, viewed from presentation, ammeter is in an abnormal duty.And when ammeter is in electricity shortage state repeatedly, can internal cell be consumed unavoidably.Be in battery consumption state for a long time, be fatal concerning ammeter, directly affect the life-span of ammeter.Measures of anti-stealing electricity that before also can be similar for this stealing mode, but due to hardware resource limited, within the scope of some low pressure input thresholds (this low pressure input threshold is wider), also may have this situation about repeatedly resetting and occur.
Utility model content
The utility model, in order to solve above technical matters, proposes a kind of intelligent controlling device improving ammeter and repeatedly reset under low voltage situations.
Adopt following technical scheme: a kind of intelligent controlling device improving ammeter and repeatedly reset under low voltage situations for this reason, it is characterized in that: connect a triode Q1 at the internal cell of ammeter, internal cell positive pole is connected with triode Q1 emitter, the collector of triode Q1 connects the first resistance R1, the second resistance R2 in parallel, first resistance R1, the second resistance R2 other end ground connection, the base stage of triode Q1 connects the 3rd resistance R3, the 3rd resistance R3 and is connected with a common I/O port of the single-chip microcomputer established in ammeter.
The resistance of the first resistance R1, the second resistance R2 is 200 ohm.The resistance of the 3rd resistance R3 is 1000 ohm.Triode Q1 is positive-negative-positive.
The beneficial effects of the utility model: completely eliminate because ammeter normally work required for the energy value that provides, and ammeter Power supply belt carries the difference existed between characteristic, and the work blind area of the ammeter produced.After improving, make in full voltage range, any one magnitude of voltage inputs to ammeter, and the state of ammeter is all stable clear and definite.The phenomenon repeatedly resetted can not be there is.Protection ammeter internal cell, ensure that ammeter whole service life.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model;
Fig. 2 is RC power circuit.
Embodiment
As shown in the figure, a kind of intelligent controlling device improving ammeter and repeatedly reset under low voltage situations, a triode Q1 is connected at the internal cell of ammeter, internal cell positive pole is connected with triode Q1 emitter, the collector of triode Q1 connects the first resistance R1, the second resistance R2 in parallel, first resistance R1, the second resistance R2 other end ground connection, the base stage of triode Q1 connects the 3rd resistance R3, the 3rd resistance R3 and is connected with a common I/O port of the single-chip microcomputer established in ammeter.
The resistance of the first resistance R1, the second resistance R2 is 200 ohm.The resistance of the 3rd resistance R3 is 1000 ohm.Triode Q1 is positive-negative-positive.
Principle: for RC power supply, externally fed alternating voltage is linear, so for being linearly power supply, can be supplied to the energy of ammeter work, is also linear.When external communication voltage is 10V, RC power supply can only provide 3.3V, and the energy of 100uA, to electric meter system, but can trigger ammeter electrifying startup.Along with external voltage rises gradually, ammeter Power supply belt loading capability also rises gradually.Such as, when alternating voltage is 30V, 3.3V can be provided, the energy of 1mA.And ammeter normally works, required energy is fixing (such as: 3.3V, 1mA).When voltage is between 10 to 30V, then ammeter is in, and be triggered startup, but does not have enough externally fed energy to provide ammeter normally to work.So there is this border transition blind area in linear power supply.The object of this programme, will eliminate this border transition blind area exactly.Ammeter is made all to be in steady state (SS) in all voltage ranges.
Increase as after the element of Fig. 1, when the externally fed of ammeter disconnects, ammeter enters dormant state.Now, by ammeter Single-chip Controlling, the first resistance R1, the second resistance R2 are opened.When ammeter external power source rises gradually, as when being raised to 20V, the energy that ammeter RC power supply can provide, first flows through dummy load.If RC power supply cannot drive the first resistance R1, the second resistance R2, then output voltage can be dragged down in 3.3V by the first resistance R1, the second resistance R2.And ammeter power-up state can not be triggered.Same principle, when voltage is from 10V to 29V, all external energies, all by the first resistance R1, the second resistance R2 absorb, and can not false triggering ammeter electrifying startup.Reach and ammeter is vised in dormant state.The first resistance R1, the second resistance R2 can be driven higher than 30V, RC power supply once ammeter external voltage.RC electric power output voltage reaches 3.3V, then can trigger ammeter electrifying startup.When ammeter electrifying startup, the first resistance R1, the second resistance R2 close by ammeter Single-chip Controlling, and namely the first resistance R1, the second resistance R2 be not at any energy of consumption.And the energy that the first resistance R1, the second resistance R2 save, be enough to allow ammeter normally work, do not consume internal cell again.Thus realize, eliminate RC power supply to the border transition blind area of ammeter energy supply.
The resistance of adjustment first resistance R1, the second resistance R2 can be passed through, itself and self maximum load are matched (being a bit larger tham self maximum load can be relatively good), as comprised the load when all functions such as RF communication are opened.If now front end power supply is inadequate with ability, the magnitude of voltage of the VCC in Fig. 2 just can be suppressed in a lower voltage always.Along with the rising of front end input voltage, the magnitude of voltage of VCC also can slowly raise, and when reaching upper electro-detection, because fictitious load one direct-open of our rear end, so power supply has possessed the ability driving self maximum load of whole table, can not cause reset.Now close the first resistance R1, the second resistance R2, open ammeter all functions, ammeter also there will not be the phenomenon repeatedly resetted, like this with regard to before improving very well due to problem that ammeter during low pressure resets repeatedly.
Claims (4)
1. the intelligent controlling device improving ammeter and repeatedly reset under low voltage situations, it is characterized in that: connect a triode Q1 at the internal cell of ammeter, internal cell positive pole is connected with triode Q1 emitter, the collector of triode Q1 connects the first resistance R1, the second resistance R2 in parallel, first resistance R1, the second resistance R2 other end ground connection, the base stage of triode Q1 connects the 3rd resistance R3, the 3rd resistance R3 and is connected with a common I/O port of the single-chip microcomputer established in ammeter.
2. the intelligent controlling device improving ammeter and repeatedly reset under low voltage situations according to claim 1, is characterized in that: the resistance of the first resistance R1, the second resistance R2 is 200 ohm.
3. the intelligent controlling device improving ammeter and repeatedly reset under low voltage situations according to claim 1, is characterized in that: the resistance of the 3rd resistance R3 is 1000 ohm.
4. the intelligent controlling device improving ammeter and repeatedly reset under low voltage situations according to claim 1, is characterized in that: triode Q1 is positive-negative-positive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520506682.3U CN204790439U (en) | 2015-07-14 | 2015-07-14 | Improve intelligent control device that ammeter resets repeatedly under low pressure condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520506682.3U CN204790439U (en) | 2015-07-14 | 2015-07-14 | Improve intelligent control device that ammeter resets repeatedly under low pressure condition |
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| Publication Number | Publication Date |
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| CN204790439U true CN204790439U (en) | 2015-11-18 |
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| CN201520506682.3U Active CN204790439U (en) | 2015-07-14 | 2015-07-14 | Improve intelligent control device that ammeter resets repeatedly under low pressure condition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107860955A (en) * | 2017-11-03 | 2018-03-30 | 华立科技股份有限公司 | The reset circuit and ammeter of ammeter |
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2015
- 2015-07-14 CN CN201520506682.3U patent/CN204790439U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107860955A (en) * | 2017-11-03 | 2018-03-30 | 华立科技股份有限公司 | The reset circuit and ammeter of ammeter |
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