CN102377222B - Reliable working circuit of disposable environment-friendly lithium battery for liquid crystal display electric energy meter - Google Patents
Reliable working circuit of disposable environment-friendly lithium battery for liquid crystal display electric energy meter Download PDFInfo
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- CN102377222B CN102377222B CN201110339319.3A CN201110339319A CN102377222B CN 102377222 B CN102377222 B CN 102377222B CN 201110339319 A CN201110339319 A CN 201110339319A CN 102377222 B CN102377222 B CN 102377222B
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Abstract
The invention relates to a reliable working circuit of a disposable environment-friendly lithium battery for a liquid crystal display electric energy meter. The reliable working circuit is characterized by comprising a single-chip U1, wherein the single-chip U1 is connected with a short connection point K3 through a resistor R51; the resistor R51 is connected with a resistor R46; the other end of the resistor R46 is grounded; the short connection point K3 is sequentially connected with a resistor R64, a diode D10 and a resistor R65; the other end of the resistor R65 is connected with a pin 73 of the single-chip U1; the short connection point K3 is connected with a diode D5; a voltage division circuit formed by the resistors R51 and R46 is connected with a pin 50 of the single-chip U1 to detect a lithium battery voltage; and the resistors R64 and R65 and the diode D10 are connected with the pin 73 of the single-chip U1 to form a discharging circuit of the lithium battery. When the liquid crystal display electric energy meter works normally, a low level signal is output by the single-chip to the lithium battery in timing to discharge, the lithium battery is in a working state during discharging, and the lithium battery does not discharge when the single-chip outputs a high level. The reliable working circuit of the disposable environment-friendly lithium battery for the liquid crystal display electric energy meter can provide a stable back-up power supply for the energy meter and ensure the correctness of a liquid crystal display electric energy meter clock and the power failure display function.
Description
Technical field
The present invention relates to field of measuring techniques, is a kind of liquid crystal display electric energy meter environment protection type disposable lithium battery reliable working circuit of disposable.
Background technology
Environment protection type disposable lithium battery, hereinafter to be referred as lithium battery, the positive active material thionyl chloride of lithium battery directly contacts with negative electrode active material lithium metal, and lithium metal surface can generate the lithium chloride passivating film of one deck densification.This layer of passivating film can effectively protect lithium surface not continued corrosion on the one hand, makes this lithium battery energy long term storage, has good storage life.This layer of passivating film is owing to being ion conductor but then, and electronic body, in the time that external circuit is connected, according to the size of discharging current, this layer of passivating film can produce different voltage drops, makes lithium battery output voltage lower than normal working voltage, makes lithium battery voltage produce hysteresis.Along with the carrying out of electric discharge, passivating film comes off gradually, and the operating voltage of lithium battery could be recovered gradually, and therefore voltage delay is the intrinsic characteristic of lithium-thionyl chloride lithium battery, cannot avoid.It is absolute that lithium battery voltage lags behind, but the degree of voltage delay is relative.The degree that lithium battery voltage lags behind and the discharging current of lithium battery have relation.After storage, there is the larger voltage delay degree of lithium battery discharging current of voltage delay larger.The voltage delay degree of lithium battery is again dynamic, due to the generation of passivating film, is an electrochemical reaction process slowly, the temperature that this reaction and lithium battery store, there are much relations the time of storage, and temperature is higher, storage time is longer, and passivating film generates finer and close.It is more serious that lithium battery shows as voltage delay.Lithium battery stores at normal temperatures and at high temperature stores, and the growth conditions of passivating film is not exclusively equal to.Lithium battery can not solve lithium battery surface passivation by the electric current power supply of tens microamperes, now uses large current work, if the passivating film of electrode surface is very thick, lithium battery voltage moment likely can drop to below 1.8V.
The running environment of liquid crystal display electric energy meter is according in national standard GBT17215.211-2006/IEC62052-11:2003 6.1, and temperature range refers to table 1.Liquid crystal display electric energy meter is according to the design of outdoor table, and the limiting temperature of its storage and work is-40 DEG C～+ 70 DEG C.In the time of mains-supplied lithium battery be backup battery not in use state, be just equivalent to be stored in warehouse, the environment of its storage is consistent with the running environment of liquid crystal display electric energy meter, namely-40 DEG C～+ 70 DEG C.
Table 1
Because the liquid crystal display electric energy meter of present stage is multiple rate accounting, need a large amount of information relevant with time parameter of record, the time of clearing be 30 minutes to one month not etc., clock circuit can be reliable and stable work just aobvious particularly important, and the related data that reads record in table while having a power failure is also a basic function of current liquid crystal display electric energy meter.
When liquid crystal display electric energy meter is worked at civil power, because lithium battery is backup battery, so not to interlock circuit power supply, only just use in the time losing civil power.Lithium battery is mainly given the interlock circuit power supplies such as clock circuit and power failure display circuit.Clock circuit in liquid crystal display electric energy meter needs to ensure the accurate of time by lithium battery power supply after civil power is stopped power supply always, but the electric current of its circuit only has several microamperes, can not stop the formation of passivating film, and the power failure display circuit starting stage needs the discharging current of tens milliamperes.In liquid crystal display electric energy meter lithium battery circuit in the past, only have lithium battery voltage testing circuit, and do not consider the impact bringing due to the characteristic of lithium battery itself.If liquid crystal display electric energy meter has moved 1 year or the longer time at the scene, lithium battery passivating film will form, once wake the liquid crystal display electric energy meter demonstration that has a power failure up after mains failure, because can causing lithium battery, the formation of lithium battery passivating film do not provide at short notice reliable and stable supply power voltage, thereby cause clock circuit supply power voltage deficiency, affect the steady operation of clock circuit, serious meeting quits work the clock circuit short time
now the time can be got back to an initial value.Time after restoring electricity in liquid crystal display electric energy meter can start to operation from a certain initial time, because the time after restoring electricity is not the actual time of recording at that time, therefore, the data that continue operation storage are to record under the wrong time, can not carry out according to the correct time, also just mean that electric energy meter program can be according to wrong time save data, will there is deviation with normal settings in the time of implementation of each rate of liquid crystal display electric energy meter so, do not descend at one time its data of record data just to lose authenticity.Except meeting causes the displaying time date not external, also can cause the account day not settle accounts, rate execution error, causes the problems such as user power utilization dispute.
Summary of the invention
The object of the invention is to provide a kind of liquid crystal display electric energy meter environment protection type disposable lithium battery reliable working circuit of disposable, it by increasing the discharge circuit of lithium battery in lithium battery circuit, using according to the film formed time feature of lithium battery passivation utilizes single-chip microcomputer to come discharge time and the frequency of controlled discharge circuit again, make it can ensure that lithium battery does not form passivating film, can ensure again the reliability of lithium battery.
The object of the invention is to be realized by following technical scheme: a kind of liquid crystal display electric energy meter environment protection type disposable lithium battery reliable working circuit of disposable, single-chip microcomputer U1 is connected with short circuit point K3 by resistance R 51, short circuit point K3 is connected with the positive pole of lithium battery BAT1, the minus earth of lithium battery BAT1; Resistance R 51 is connected with resistance R 46, resistance R 46 other end ground connection; Short circuit point K3 connects with resistance R 64, diode D10, resistance R 65 successively, and resistance R 65 other ends are connected with 73 pin of single-chip microcomputer U1; Short circuit point K3 is connected with diode D5, and resistance R 51 and R46 composition bleeder circuit is connected with 50 pin of single-chip microcomputer U1 compresses into capable detection to lithium battery, resistance R 64,, R65, diode D10 and single-chip microcomputer 73 pin connect to form the discharge circuit of lithium battery.
Environment protection type disposable lithium battery reliable working circuit of disposable for liquid crystal display electric energy meter of the present invention, in the time that liquid crystal display electric energy meter is normally worked, the 73 pin timing output low level signals by single-chip microcomputer discharge to lithium battery, when electric discharge, lithium battery is in running order, 73 pin of single-chip microcomputer are output as high level, and when output high level equals lithium battery voltage, lithium battery does not discharge.50 pin timings of single-chip microcomputer simultaneously detect the operating voltage of lithium battery, if now lithium battery forces down in 2.7V, show that lithium battery capacity approaches and exhausts, need not carry out again discharge operation, in liquid crystal display electric energy meter liquid crystal display, point out lithium battery voltage under-voltage symbol simultaneously, notify meter reading personnel the interior lithium battery of replacing table in time.
Liquid crystal display electric energy meter can provide reliable and stable backup battery for electric energy meter with the application of environment protection type disposable lithium battery reliable working circuit of disposable, the performance of lithium battery is fully utilized, ensures the in use realization of the accurate and power failure Presentation Function of clock of liquid crystal display electric energy meter.
Brief description of the drawings
Figure is liquid crystal display electric energy meter environment protection type disposable lithium battery reliable working circuit of disposable schematic diagram.
Embodiment
With reference to scheming: the single-chip microcomputer U1 of liquid crystal display electric energy meter of the present invention environment protection type disposable lithium lithium battery reliable working circuit of disposable is connected with short circuit point K3 by resistance R 51, and short circuit point K3 is connected with the positive pole of lithium battery BAT1, the minus earth of lithium battery BAT1; Resistance R 51 is connected with resistance R 46, resistance R 46 other end ground connection; Short circuit point K3 connects with resistance R 64, diode D10, resistance R 65 successively, and resistance R 65 other ends are connected with 73 pin of single-chip microcomputer U1; Short circuit point K3 is connected with diode D5, the model of diode D5 is 1N4148, single-chip microcomputer U1 adopts FM3308 chip to have TURBO 51MCU core, the maximum 4COM × 56SEG of support of liquid crystal display drive circuit or 6COM × 40SEG, low-power consumption hardware clock and 3 road hardware serial line interfaces, 2 tunnel 7816 interfaces, I2C interface, chip internal oscillator precision can reach 8MHz ± 0.5%, 60k FLASH program storage, 3.5k xRAM, 256b iRAM.Single-chip microcomputer U1 can also adopt the chips such as model ST72F324,9S08MZ60,78F0525, R5F2L3AA.
Resistance R 51 is connected lithium battery BAT1 voltage is detected with 50 pin of single-chip microcomputer U1 with R46 composition bleeder circuit, and 73 pin of resistance R 64, diode D10, resistance R 65 and single-chip microcomputer U1 connect to form the discharge circuit of lithium battery.
Can not allow it form stage of passivation layer according to the characteristic of lithium battery, and frequency and the time of electric discharge are controlled by single-chip microcomputer U1.The load-bearing capacity of lithium battery BAT1 in 90% capacity remains unchanged substantially, and lithium battery BAT1 voltage is generally more than 3.0V.By allow it form passivation layer to the electric discharge of lithium battery BAT1, and the capacity losing owing to discharging is well below the capacity of lithium battery, can not have any impact to the use of lithium battery BAT1.
Environment protection type disposable lithium battery reliable working circuit of disposable for liquid crystal display electric energy meter of the present invention, in the time that electric energy meter is normally worked, the 73 pin timing output low level signals by single-chip microcomputer U1 discharge to lithium battery BAT1, when electric discharge, lithium battery BAT1 is in running order, 73 pin of single-chip microcomputer U1 are output as high level, and when output high level equals lithium battery BAT1 voltage, diode D10 both end voltage equates, so not conducting of diode D10, lithium battery BAT1 does not discharge.The 50 pin timings of single-chip microcomputer U1 simultaneously detect the operating voltage of lithium battery BAT1, if now lithium battery BAT1 voltage is lower than 2.7V, show that lithium battery BAT1 capacity approaches and exhausts, need not carry out again discharge operation, in liquid crystal display electric energy meter liquid crystal display, point out lithium battery BAT1 under-voltage symbol simultaneously, notify meter reading personnel the interior lithium battery BAT1 of replacing table in time.
Claims (1)
1. an environment protection type disposable lithium battery reliable working circuit of disposable for liquid crystal display electric energy meter, it has resistance R 51 and is connected with resistance R 46, the other end ground connection of resistance R 46, resistance R 51 and resistance R 46 form bleeder circuit, it is characterized in that: single-chip microcomputer U1 is connected with short circuit point K3 by resistance R 51, short circuit point K3 is connected with the positive pole of lithium battery BAT1, the minus earth of lithium battery BAT1; Short circuit point K3 connects with resistance R 64, diode D10, resistance R 65 successively, and the other end of resistance R 65 is connected with 73 pin of single-chip microcomputer U1; Short circuit point K3 is connected with diode D5, the bleeder circuit that described resistance R 51 forms with resistance R 46 is connected with 50 pin of single-chip microcomputer U1 compresses into row detection to lithium battery, resistance R 64, R65, diode D10 and single-chip microcomputer 73 pin connect to form the discharge circuit of lithium battery, can not allow it enter the stage that forms passivation layer according to the characteristic of lithium battery, and electric discharge frequency and time be controlled by single-chip microcomputer U1, single-chip microcomputer U1 model is FM3308.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110339319.3A CN102377222B (en) | 2011-11-01 | 2011-11-01 | Reliable working circuit of disposable environment-friendly lithium battery for liquid crystal display electric energy meter |
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| CN201110339319.3A CN102377222B (en) | 2011-11-01 | 2011-11-01 | Reliable working circuit of disposable environment-friendly lithium battery for liquid crystal display electric energy meter |
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| CN102377222B true CN102377222B (en) | 2014-11-05 |
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| CN104167802A (en) * | 2014-09-09 | 2014-11-26 | 成都千嘉科技有限公司 | Lithium battery depassivation circuit and method |
Citations (3)
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|---|---|---|---|---|
| CN201060908Y (en) * | 2007-07-13 | 2008-05-14 | 许宗元 | External insertion type standby battery of mobile phone |
| CN201583635U (en) * | 2009-12-31 | 2010-09-15 | 深圳市力通威电子科技有限公司 | Capacity detection circuit for power lithium batteries |
| CN202353240U (en) * | 2011-11-01 | 2012-07-25 | 深圳市江机实业有限公司 | Disposable environment-friendly lithium battery reliable working circuit for liquid crystal display electric energy meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007033147A (en) * | 2005-07-25 | 2007-02-08 | Sony Corp | Electronic apparatus |
| CN201796127U (en) * | 2010-09-03 | 2011-04-13 | 中天启明石油技术有限公司 | Device for carrying out activation test of lithium battery |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201060908Y (en) * | 2007-07-13 | 2008-05-14 | 许宗元 | External insertion type standby battery of mobile phone |
| CN201583635U (en) * | 2009-12-31 | 2010-09-15 | 深圳市力通威电子科技有限公司 | Capacity detection circuit for power lithium batteries |
| CN202353240U (en) * | 2011-11-01 | 2012-07-25 | 深圳市江机实业有限公司 | Disposable environment-friendly lithium battery reliable working circuit for liquid crystal display electric energy meter |
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| JP特开2007-33147A 2007.02.08 * |
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