CN102967756B - A kind of for the electric energy meter heater circuit under low temperature environment - Google Patents
A kind of for the electric energy meter heater circuit under low temperature environment Download PDFInfo
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- CN102967756B CN102967756B CN201210419039.8A CN201210419039A CN102967756B CN 102967756 B CN102967756 B CN 102967756B CN 201210419039 A CN201210419039 A CN 201210419039A CN 102967756 B CN102967756 B CN 102967756B
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- 238000010438 heat treatment Methods 0.000 claims description 38
- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 230000000052 comparative effect Effects 0.000 claims description 6
- 230000001419 dependent effect Effects 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 31
- 238000013461 design Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 206010037660 Pyrexia Diseases 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
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Abstract
The present invention discloses a kind of for the electric energy meter heater circuit under low temperature environment, comprise power circuit, heater circuit, temperature-control circuit and voltage comparator circuit, wherein, power circuit described in electric system power line access, described power circuit access voltage comparator circuit and heater circuit are also powered for it, described temperature-control circuit is coupled with voltage comparator circuit and is electrically connected, and accesses described heater circuit.Circuit of the present invention solves liquid crystal display and shows the slow intrinsic problem of refresh rate at low ambient temperatures, can meet the display requirement that severe cold area uses liquid crystal electric energy meter.This circuit can ensure the requirement that liquid crystal normally shows in-40 DEG C of situations.This circuit can be less than 2W in whole consumption of boasting of one's bit of contribution, and electric energy meter input voltage heats liquid crystal under being low to moderate 70%Un work prerequisite.
Description
Technical field
The present invention relates to electrical measurement instrument technology, in more specific words it, the present invention relates to a kind of for the electric energy meter heater circuit under low temperature environment.
Background technology
Along with the development of electric energy meter technology, liquid crystal display electric energy meter becomes main flow.But because the liquid crystal characteristic that display speed is slow at low ambient temperatures causes custom liquid crystals table not to be suitable for northeast, the severe cold environments such as Siberia.Traditional liquid crystal heat protocol lacks temperature-control circuit, and heating always shortens the serviceable life of liquid crystal.Power consumption is comparatively large, does not meet the requirement that electric energy meter power consumption is less than 2W.Lacking and the power of whole system is controlled, when the input voltage is low, prior metering and MCU part being caused because input voltage is worked by dragging down abnormal to liquid crystal heating.
For the heating means of liquid crystal display, Chinese patent CN101510020A discloses the heating means of a kind of ITO well heater and liquid crystal display, adopt the method for ito glass substrate heating, be greater than centre and edge rapid heat dissipation according to submarginal region thermal value, the principle that both cancel out each other makes liquid crystal surfactant generate heat evenly.
But, for this kind of advanced approach, its technical matters mainly contains: 1, described method itself lacks temperature-control circuit, adopts the heating of ito glass substrate self and heat dissipation characteristics to reach thermal equilibrium, causes liquid crystal to be in serviceable life that heated condition substantially reduces liquid crystal display always; 2, do not control heating according to the fan-out capability of power supply, during low voltage power supply situation, easily cause the significant element such as MCU and metering to reset because drag down supply voltage.The object that the present invention proposes solves the problem, and provides one and meet IEC62053-21 standard-required, simple and reliable liquid crystal heating technique scheme.
Summary of the invention
The present invention is intended to solve the defect that prior art exists, and designs a kind of liquid crystal heater circuit being applied to electric energy meter under low temperature environment, comprises power circuit, heater circuit, temperature-control circuit, voltage comparator circuit.The severe cold areas such as circuit of the present invention solves liquid crystal display and shows the slow intrinsic problem of refresh rate at low ambient temperatures, can meet such as northeast, Siberia use the display requirement of liquid crystal electric energy meter.This circuit can ensure the requirement that liquid crystal normally shows in-40 DEG C of situations.This circuit can be less than 2W in whole consumption of boasting of one's bit of contribution, and electric energy meter input voltage heats liquid crystal under being low to moderate 70%Un work prerequisite.This circuit efficiency of heating surface is high, reliable operation, and low temperature display is effective, and circuit is simple and practical, has comparatively high performance-price ratio.
In order to realize above-mentioned purpose of design, technical scheme of the present invention, a kind of for the electric energy meter heater circuit under low temperature environment, it comprises power circuit and heater circuit, comprises temperature-control circuit and voltage comparator circuit further.Wherein, power circuit described in electric system power line access, described power circuit access voltage comparator circuit and heater circuit are also powered for it, and described temperature-control circuit is coupled with voltage comparator circuit and is electrically connected, and accesses described heater circuit.
Further, in a preferred embodiment of the invention, described power circuit is by voltage dependent resistor (VDR) MOV1, transformer T1, rectifier bridge D1, electric capacity C1, C2, electrochemical capacitor E1, E2 and voltage stabilizing chip U1 forms, wherein electric system line of electric force is converted to low-voltage AC through voltage dependent resistor (VDR) MOV1 and transformer T1, described low-voltage AC is by rectifier bridge D1 rectification and electric capacity C1, DC voltage VCC is drawn after E1 filtering, described DC voltage VCC is step-down voltage+3V3 by voltage stabilizing chip U1 step-down, described step-down voltage+3V3 is by electric capacity C2, after E2 filtering, the single-chip microcomputer of ammeter and computation chip are powered, and described DC voltage is powered to heater circuit.
Further, in a preferred embodiment of the invention, described heater circuit is made up of resistance R6, triode Q1 and heating plate TH, and wherein step-down voltage+3V3 is powered to triode Q1 by resistance R6, and described triode Q1 is connected to heating plate TH and earth terminal GND further.
Further, in a preferred embodiment of the invention, the heat described heating plate TH produced is VCC
2/ R, wherein R is the resistance value of heating plate TH.
Further, in a preferred embodiment of the invention, the back side that LCDs is close on a surface of described heating plate TH is heated it, and another surface uses heat-barrier material to be wrapped up, and is embedded with PTC thermistor RT at the center position of described heating plate TH.
Further, in a preferred embodiment of the invention, described temperature-control circuit is by resistance R1, R2, R5, R7, comparer U2B, thermistor RT form, and the step-down voltage+3V3 of wherein said power circuit is by resistance R1, draw comparative voltage VREF after R2 dividing potential drop, the I/O mouth that resistance R5, R7, RT are connected serially to ammeter single-chip microcomputer draws another comparative voltage.
Further, in a preferred embodiment of the invention, voltage comparator circuit is made up of resistance R3, R4 and comparer U2A.When ammeter powers on, DC voltage VCC and+3V3 synchronously rises, and voltage VCC obtains the 3 pin voltages of comparer U2A by resistance R3, R4 dividing potential drop.The 3 pin voltages of U2A are less than VREF voltage, U2A output low level.When VCC voltage continues to rise, 3 pin voltages continue to rise, and+3V3 is stabilized in 3.3V by U1, and VREF stablizes.
When a system is powered up, I/O mouth MCU_IO is defaulted as input state, is 3.3V voltage by resistance R7 pull-up.Reverse input end 6 pin of comparer U2B is higher than the voltage VREF of positive input 5 pin all the time, and comparer output low level, triode Q1 ends, and now heating plate TH does not work.When system completes after initialization starts working, I/O mouth MCU_IO output low level, the 6 pin voltages of U2B are [3.3/(R5+RT)] * RT.
In a preferred embodiment of the invention, when liquid crystal temperature reduces, the resistance of resistance RT reduces, and the 6 pin voltages of comparer U2B decrease, and when liquid crystal temperature is lower than 0 DEG C, described 6 pin voltages export cut-off lower than VREF, U2B.When U2A output also ends, triode Q1 is by R6 for conducting, and heating plate TH works, and temperature rises, and the resistance of RT increases, the 6 pin voltage rise of comparer U2B.When temperature rises to higher than more than 0 DEG C, the 6 pin voltages of comparer U2B are higher than 5 pin voltages, and U2B output low level, triode Q1 stops conducting, and heating plate TH stops heating.
In a preferred embodiment of the invention, when VCC voltage rise is to system worked well voltage, the 3 pin voltages of comparer U2A are greater than VREF, and U2A exports cut-off, stop carrying out short circuit to the B level of triode Q1.When ammeter works under 70%Un low voltage condition, transformer T1 Maximum Power Output only has 0.49 times during Un.
If temperature can cause VCC to drop to minimum value (+3V3 and voltage stabilizing chip minimum differntial pressure sum) below lower than Q1 conducting heating plate TH work when 0 DEG C, voltage comparator circuit make VCC voltage drop to minimum value before U2A output low level, turn off triode Q1, VCC voltage is finally stabilized in VREF* (R3+R4)/R4 voltage range.
The invention has the beneficial effects as follows apparent, circuit of the present invention solves liquid crystal display and shows the slow intrinsic problem of refresh rate at low ambient temperatures, can meet the display requirement that severe cold area uses liquid crystal electric energy meter.This circuit can ensure the requirement that liquid crystal normally shows in-40 DEG C of situations.This circuit can be less than 2W in whole consumption of boasting of one's bit of contribution, and electric energy meter input voltage heats liquid crystal under being low to moderate 70%Un work prerequisite.Such as, voltage comparator circuit of the present invention is limited according to Industrial Frequency Transformer output power, preferential guarantee gage work is then only the primary-slave relation design of heater circuit, control the whole consumption of boasting of one's bit of contribution of ammeter and be no more than 2W, and ensureing that can be supplied to fever tablet TH with maximum power in back-end chip operating voltage situation heats fast.
Accompanying drawing explanation
The preferred embodiment of the present invention will embodied in detail below by way of the mode with reference to accompanying drawing, and the identical function components/circuits in figure is marked with same-sign, wherein
Fig. 1 is the circuit theory diagrams of the preferred embodiment of electric energy meter heater circuit of the present invention.
Embodiment
With reference to Fig. 1, the preferred embodiment of the electric energy meter heater circuit that the present invention is used under low temperature environment comprises power circuit 10 and heater circuit 20, comprise temperature-control circuit 30 and voltage comparator circuit 40 further, wherein the live wire L of electric system line of electric force and zero line N accesses described power circuit 10, described power circuit 10 accesses voltage comparator circuit 40 and heater circuit 20 is also powered for it, described temperature-control circuit 30 is coupled with voltage comparator circuit 40 and is electrically connected, and accesses described heater circuit 20.
Further, in a preferred embodiment of the invention, power circuit 10 is made up of voltage dependent resistor (VDR) MOV1, transformer T1, rectifier bridge D1, electric capacity C1, C2, electrochemical capacitor E1, E2 and voltage stabilizing chip U1.Electric system 220V alternating voltage is converted to low-voltage AC through voltage dependent resistor (VDR) MOV1 and transformer T1.Low-voltage AC is by rectifier bridge D1 rectification and electric capacity C1, DC voltage VCC is drawn after E1 filtering, this DC voltage VCC is step-down voltage+3V3 by voltage stabilizing chip U1 step-down, this voltage+3V3 is by electric capacity C2, powered to electrical parts such as the single-chip microcomputer of ammeter and computation chips after E2 filtering, DC voltage VCC powers to heater circuit 20 simultaneously.
Further, in a preferred embodiment of the invention, heater circuit 20 is by resistance R6, and triode Q1 and heating plate TH forms.When heating, the step-down voltage+3V3 of power circuit 10 is powered to triode Q1 by resistance R6, and now Q1 conducting, the electric current of port VCC flows through heating plate TH, triode Q1 to GND.
In a preferred embodiment of the invention, heat heating plate TH produced is VCC
2/ R.
Further, in a preferred embodiment of the invention, the one side of heating plate TH is close to the liquid crystal display back side and is heated liquid crystal display.Another side uses heat-barrier material parcel, reduces heat and improves the efficiency of heating surface from non-heated loss.The center of heating plate TH embedded in PTC thermistor RT.
Further, in a preferred embodiment of the invention, temperature-control circuit 30 is by resistance R1, and R2, R5, R7, comparer U2B, thermistor RT form.+ 3V3 is by obtaining a comparative voltage VREF after resistance R1 and R2 dividing potential drop, and the I/O mouth MCU_IO that resistance R5, R7, RT are connected serially to ammeter single-chip microcomputer draws another comparative voltage.
When a system is powered up, I/O mouth MCU_IO is defaulted as input state, is 3.3V voltage by resistance R7 pull-up.Reverse input end 6 pin of comparer U2B is higher than the voltage VREF of positive input 5 pin all the time, and comparer output low level, triode Q1 ends, and now heating plate TH does not work.When system completes after initialization starts working, I/O mouth MCU_IO output low level, the 6 pin voltages of U2B are [3.3/(R5+RT)] * RT.
In a preferred embodiment of the invention, when liquid crystal temperature reduces, the resistance of resistance RT reduces, and the 6 pin voltages of comparer U2B decrease, and when liquid crystal temperature is lower than 0 DEG C, described 6 pin voltages export cut-off lower than VREF, U2B.When U2A output also ends, triode Q1 is by R6 for conducting, and heating plate TH works, and temperature rises, and the resistance of RT increases, the 6 pin voltage rise of comparer U2B.When temperature rises to higher than more than 0 DEG C, the 6 pin voltages of comparer U2B are higher than 5 pin voltages, and U2B output low level, triode Q1 stops conducting, and heating plate TH stops heating.
Further, in a preferred embodiment of the invention, voltage comparator circuit 40 is made up of resistance R3, R4 and comparer U2A.When ammeter powers on, DC voltage VCC and+3V3 synchronously rises, and voltage VCC obtains the 3 pin voltages of comparer U2A by resistance R3, R4 dividing potential drop.The 3 pin voltages of U2A are less than VREF voltage, U2A output low level.When VCC voltage continues to rise, 3 pin voltages continue to rise, and+3V3 is stabilized in 3.3V by U1, and VREF stablizes.
In a preferred embodiment of the invention, when VCC voltage rise is to system worked well voltage, the 3 pin voltages of comparer U2A are greater than VREF, and U2A exports cut-off, stop carrying out short circuit to the B level of triode Q1.When ammeter works under 70%Un low voltage condition, transformer T1 Maximum Power Output only has 0.49 times during Un.
If temperature can cause VCC to drop to minimum value (+3V3+ voltage stabilizing chip minimum differntial pressure) below lower than Q1 conducting heating plate TH work when 0 DEG C, voltage comparator circuit 40 make VCC voltage drop to minimum value before U2A output low level, turn off Q1, VCC voltage and be finally stabilized in VREF* (R3+R4)/R4 voltage range.Voltage comparator circuit 40 is limited according to Industrial Frequency Transformer output power, preferential guarantee gage work is then only the primary-slave relation design of heater circuit, control the whole consumption of boasting of one's bit of contribution of ammeter and be no more than 2W, and ensureing that can be supplied to fever tablet TH with maximum power in back-end chip operating voltage situation heats fast.These are only the preferred embodiment of the present invention, being intended to embody outstanding technique effect of the present invention and advantage, is not the restriction to technical scheme of the present invention.Those skilled in the art will appreciate that all are based on the amendment done by the technology of the present invention content, change or substitute technology feature, all should be covered by the technology category of claims of the present invention opinion.
Claims (4)
1. one kind have power control and power supply priority for the electric energy meter heater circuit under low temperature environment, it comprises power circuit (10) and heater circuit (20), it is characterized in that: comprise temperature-control circuit (30) and voltage comparator circuit (40) further, wherein power circuit (10) described in electric system power line access, described power circuit (10) access voltage comparator circuit (40) and heater circuit (20) powering for it, described temperature-control circuit (30) is coupled with voltage comparator circuit (40) and is electrically connected, and access described heater circuit (20), wherein said power circuit (10) is by voltage dependent resistor (VDR) MOV1, transformer T1, rectifier bridge D1, electric capacity C1, C2, electrochemical capacitor E1, E2 and voltage stabilizing chip U1 forms, wherein electric system line of electric force is converted to low-voltage AC through voltage dependent resistor (VDR) MOV1 and transformer T1, described low-voltage AC is by rectifier bridge D1 rectification and electric capacity C1, DC voltage VCC is drawn after E1 filtering, described DC voltage VCC is step-down voltage+3V3 by voltage stabilizing chip U1 step-down, described step-down voltage+3V3 is by electric capacity C2, after E2 filtering, the single-chip microcomputer of ammeter and computation chip are powered, and described DC voltage is powered to heater circuit (20), described heater circuit (20) is by resistance R6, triode Q1 and heating plate TH forms, wherein step-down voltage+3V3 is powered to triode Q1 by resistance R6, described triode Q1 is connected to heating plate TH and earth terminal GND further.
2. have as claimed in claim 1 power control and power supply priority for the electric energy meter heater circuit under low temperature environment, it is characterized in that: described heating plate TH on generation heat W meet W=V
cC 2/ R, wherein R is the resistance value of heating plate TH.
3. have as claimed in claim 1 power control and power supply priority for the electric energy meter heater circuit under low temperature environment, it is characterized in that: the back side that LCDs is close on a surface of described heating plate TH is heated it, another surface uses heat-barrier material to be wrapped up, and is embedded with PTC thermistor RT at the center position of described heating plate TH.
4. have as claimed in claim 1 power control and power supply priority for the electric energy meter heater circuit under low temperature environment, it is characterized in that: described temperature-control circuit (30) is by resistance R1, R2, R5, R7, comparer U2B, thermistor RT form, step-down voltage+the 3V3 of wherein said power circuit (10) is that the I/O mouth that resistance R5, R7, RT are connected serially to ammeter single-chip microcomputer draws another comparative voltage by drawing comparative voltage VREF after resistance R1, R2 dividing potential drop.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210419039.8A CN102967756B (en) | 2012-10-26 | 2012-10-26 | A kind of for the electric energy meter heater circuit under low temperature environment |
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| CN201210419039.8A CN102967756B (en) | 2012-10-26 | 2012-10-26 | A kind of for the electric energy meter heater circuit under low temperature environment |
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| CN102967756A CN102967756A (en) | 2013-03-13 |
| CN102967756B true CN102967756B (en) | 2015-09-30 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105759478B (en) * | 2016-03-28 | 2019-01-22 | 华立科技股份有限公司 | Liquid crystal display heating device and control method |
| CN105759479B (en) * | 2016-03-28 | 2019-01-22 | 华立科技股份有限公司 | Liquid crystal heating device and control method with communication function |
| CN105892127B (en) * | 2016-06-14 | 2019-03-01 | 京东方科技集团股份有限公司 | Display panel and preparation method thereof, display device |
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| CN201298123Y (en) * | 2008-10-28 | 2009-08-26 | 厦门赛特勒电子有限公司 | LCD module |
| CN101625490A (en) * | 2008-07-07 | 2010-01-13 | 立景光电股份有限公司 | Heating system for display panel and display panel using the same |
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| CN203012012U (en) * | 2012-10-26 | 2013-06-19 | 华立仪表集团股份有限公司 | Electric energy meter heating circuit used in low temperature environment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11288318A (en) * | 1998-04-02 | 1999-10-19 | Kokusai Electric Co Ltd | Liquid crystal display device |
| JP2012208368A (en) * | 2011-03-30 | 2012-10-25 | Sinfonia Technology Co Ltd | Liquid crystal display device |
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2012
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2503560Y (en) * | 2001-09-21 | 2002-07-31 | 深圳深辉技术有限公司 | Liquid crystal display module able to normal working at ultra-low temp. |
| CN101625490A (en) * | 2008-07-07 | 2010-01-13 | 立景光电股份有限公司 | Heating system for display panel and display panel using the same |
| CN201298123Y (en) * | 2008-10-28 | 2009-08-26 | 厦门赛特勒电子有限公司 | LCD module |
| CN101510020A (en) * | 2009-03-24 | 2009-08-19 | 天马微电子股份有限公司 | ITO heater and heating method of LCD |
| CN201440191U (en) * | 2009-08-04 | 2010-04-21 | 深圳和而泰智能控制股份有限公司 | Heating device keeping temperature of liquid crystal module (LCM) and equipment thereof |
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