CN102147627B - Linear temperature adjusting circuit with temperature detection resistors for controlling temperature for temperature adjusting device - Google Patents
Linear temperature adjusting circuit with temperature detection resistors for controlling temperature for temperature adjusting device Download PDFInfo
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- CN102147627B CN102147627B CN 201010107998 CN201010107998A CN102147627B CN 102147627 B CN102147627 B CN 102147627B CN 201010107998 CN201010107998 CN 201010107998 CN 201010107998 A CN201010107998 A CN 201010107998A CN 102147627 B CN102147627 B CN 102147627B
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Abstract
The invention discloses a linear temperature adjusting circuit with temperature detection resistors for controlling temperature for a temperature adjusting device. The linear temperature adjusting circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a potentiometer and a temperature detection resistor, wherein after being connected in parallel, the fifth resistor and the potentiometer are serially connected with the third resistor and the fourth resistor respectively; the third resistor is serially connected with the first resistor and the second resistor; the fourth resistor is serially connected with the temperature detection resistor; the linear temperature adjusting circuit further comprises a pull-up resistor, wherein one end of the pull-up resistor is connected between the third resistor and the first resistor; and the other end of the pull-up resistor is connected with a sliding end of the potentiometer. The linear temperature adjusting circuit disclosed by the invention can linearly adjust temperature and bring convenience to users.
Description
Technical field
The present invention relates to a kind of linear temperature adjustment circuit, particularly a kind of linear temperature adjustment circuit that utilizes temperature detection resistance to carry out the temperature equipment of temperature control.
Background technology
Temperature control device is widely used in industry and consumer field, in these equipment, has and much can utilize thermally sensitive resistance to carry out thermometric and temperature control, and these resistance are called temperature detection resistance.When temperature variation, the resistance of temperature detection resistance changes thereupon, and this variation is converted into electric signal and is controlled circuit sampling and analysis, controls at last heating or refrigeration plant work or stops to control temperature.When the needs temperature adjustment, utilize the temperature that a potentiometer is regulated needs control.In these temperature detection resistance, the resistance of positive temperature coefficient (PTC) is arranged, the resistance of negative temperature coefficient is arranged, the situation that the present invention relates to is that it is linearity or approximately linear that the resistance of these resistance varies with temperature in the temperature range of needs control.
As shown in Figure 1, RH is temperature detection resistance, dividing potential drop by the first resistance R 1 and the second resistance R 2 offers reference voltage Vr of control circuit, potentiometer VR and the 5th resistance R 5 rear and the 3rd resistance R 3 in parallel, 4 series connection of the 4th resistance R consist of thermoregulation circuit, potentiometer VR and 5 parallel connections of the 5th resistance R be because temperature detection resistance RH some the time (during such as the MCH heater, MCH refers to the metal heating layer is printed in the ceramic basic unit, then the resistance ceramic heating element that forms at common sintering more than 1600 ℃) is smaller, generally in 100 ohm, and consider Cost Problems, potentiometer VR can adopt the potentiometer of 10k left and right sides resistance relatively commonly used, like this potentiometer VR just must the 5th little resistance R 5 of parallel connection variation to guarantee that its scope can adaptive temperature detection resistance R H.The comparison of dividing potential drop Vs and reference voltage Vr by thermoregulation circuit determines whether the work at present circuit needs work.Utilizing the dividing potential drop of the first resistance R 1 and 2 pairs of power supplys of the second resistance R to be used as reference, is for the fluctuation of eliminating supply voltage VCC sampled result to be impacted.Finally, when dividing potential drop Vs and reference voltage Vr equated, operating circuit quit work.
Suppose in a certain temperature, the resistance of potentiometer place in circuit is VR, and the equation of dividing potential drop Vs and reference voltage Vr is suc as formula (1) and formula (2) in the time of can obtaining temperature and reach design temperature to temperature:
Vs＝VCC*(RH+R4+R5//VR)/(RH+R4+R5//VR+R3)---------(1)
Vr＝VCC*R2/(R1+R2)-------------------------------------------------(2)
Suppose R1=R2, can obtain formula (3) by Vs=Vr,
RH＝R3-R4-R5//VR ------------------------------------------(3)
Wherein, R5//VR=R5*VR/ (R5+VR)--------------------------------------(4)
Can be found out potentiometer VR and the non-linear relation of temperature detection resistance RH by formula (3) and formula (4).Because temperature detection resistance RH and temperature are linear change, so the variation of potentiometer VR can not cause the linear change of temperature.Because most potentiometers are linear, so this is to user's part of making troubles, namely to turn over temperature variation corresponding to identical position different for potentiometer.
Summary of the invention
Technical matters to be solved by this invention provides a kind of linear temperature adjustment circuit that utilizes temperature detection resistance to carry out the temperature equipment of temperature control, and it can regulate temperature linearly.
For solveing the technical problem, the invention provides a kind of linear temperature adjustment circuit that utilizes temperature detection resistance to carry out the temperature equipment of temperature control, it comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, potentiometer and temperature detection resistance, after the 5th resistance and the potentiometer parallel connection respectively with the 3rd resistance, the series connection of the 4th resistance, the 3rd resistance and the first resistance, the series connection of the second resistance, the 4th resistance is connected with temperature detection resistance, it is characterized in that, this linear temperature adjustment circuit also comprises pull-up resistor, one of pull-up resistor terminates between the 3rd resistance and the first resistance, and the other end of pull-up resistor is connected with the sliding end of potentiometer.
Preferably, described temperature detection resistance and the second resistance ground connection all.
Positive progressive effect of the present invention is: the present invention can regulate temperature linearly, brings convenience to the user.
Description of drawings
Fig. 1 is the circuit diagram of existing thermoregulation circuit.
Fig. 2 is the circuit diagram of one embodiment of the invention.
Fig. 3 is that the temperature detection resistance resistance controlled of the present invention is with the schematic diagram of potentiometer change curve.
Fig. 4 is that the temperature detection resistance resistance of existing thermoregulation circuit is with the schematic diagram of potentiometer change curve.
Embodiment
The below lifts a preferred embodiment, and comes by reference to the accompanying drawings the clearer the present invention that intactly illustrates.
As shown in Figure 2, the linear temperature adjustment circuit that the present invention utilizes temperature detection resistance to carry out the temperature equipment of temperature control comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, pull-up resistor R6, potentiometer VR and temperature detection resistance RH, after the 5th resistance R 5 and the potentiometer VR parallel connection respectively with the 3rd resistance R 3,4 series connection of the 4th resistance R, the 3rd resistance R 3 and the first resistance R 1,2 series connection of the second resistance R, the 4th resistance R 4 is connected with temperature detection resistance RH, temperature detection resistance RH and the second resistance R 2 be ground connection (GND) all, one of pull-up resistor R6 terminates between the 3rd resistance R 3 and the first resistance R 1, and the other end of pull-up resistor R6 is connected with the sliding end of potentiometer VR.The scheme of the present invention and prior art is compared, the cut-in method that the main place that changes is potentiometer VR has changed, its sliding end no longer links to each other with a stiff end, but directly is linked into control circuit as dividing potential drop Vs, and has added individual pull-up resistor R6 between control circuit and potentiometer VR.The purpose of pull-up resistor R6 be when the potentiometer slide plate breaks down loose contact to fixing voltage of dividing potential drop Vs so that control circuit is unlikely to out of control, this can be selected as the case may be to draw or be drop-down.Because the resistance of pull-up resistor R6 is far longer than the resistance after the thermoregulation circuit serial connection, so the impact of its dividing potential drop Vs during on normal operation is very little, when below analyzing potentiometer and regulating temperature linearly, pull-up resistor R6 is ignored.
Suppose certain constantly potentiometer VR sliding end to position left-hand component be a (a≤1), wherein, a represents potentiometer sliding end position, Far Left is 0, rightmost is 1.The total resistance of potentiometer is VR, and the equation of dividing potential drop Vs is formula (5) in the time of can calculating temperature:
Vs＝VCC*[RH+R4+a*(R5//VR)]/(RH+R4+R3+R5//VR)-------(5)
Suppose R1=R2, Vs=Vr,
Can be got by formula (2): Vs=Vr=Vcc/2-----------------------------------------------(6)
RH＝R3-R4+(1-2a)*(R5//VR)-------------------------------------------(7)
Can be found out by formula (7), because R3, R4 and R5//VR are steady state value, so the position a of the resistance of temperature detection resistance RH and potentiometer sliding end is linear, so potentiometer can be regulated temperature linearly.
It is the temperature detection resistance of positive temperature coefficient (PTC) that assumed temperature detects resistance R H, resistance is Rmax when the highest temperature of setting, temperature is Rmin when setting lowest temperature, suppose R1=R2, be Vr=VCC/2, keep dividing potential drop Vs to equal VCC/2, as potentiometer VR during at high order end, temperature detection resistance RH is maximum, and temperature is also the highest; Potentiometer VR is when rightmost, and temperature detection resistance RH is minimum, and temperature is also minimum.Suppose that the resistance of temperature detection resistance RH is smaller here, below 100 ohm, be changed to tens ohm at the high low temperature internal resistance value of setting, so can obtain the resistance of the 5th resistance R 5 can be greater than 100 ohm yet, potentiometer VR is for cost consideration, adopt the potentiometer of individual pen 10k ohm commonly used, thus VR＞＞R5, the value of VR//R5 can be approximated to be R5.
Formula (8) and the formula (9) of temperature Rmin when resistance R max is with the setting lowest temperature in the time of can drawing the highest temperature,
Rmax+R4＝R3+R5------------------------------------------------------------------(8)
Rmin+R4＝R3-R5------------------------------------------------------------------(9)
According to formula (8) and formula (9), can get: R5=1/2 (Rmax-Rmin), R3-R4=1/2 (Rmax+Rmin).
As seen the 5th resistance R 5 has determined the high low temperature range of temperature controlling instruments, and the 3rd resistance R 3 has determined temperature spot, and the 4th resistance R 4 can have been adjusted the side-play amount of temperature detection resistance RH, uses as the trim of resistance difference.Here it is fine that assumed temperature detects resistance R H consistance, and the 4th resistance R 4 can be cancelled, and is 0.
Suppose Rmax=50ohm (ohm), Rmin=30ohm (ohm), temperature changes to 200 degree from 100 degree.Can obtain R5=10ohm, R3=40ohm.Can be obtained by formula (6), when the sliding end of potentiometer from 0 to 1 changed, relevant temperature detected the RH=50-20a that is changed to of resistance R H, and concrete temperature with the potentiometer change curve as shown in Figure 3.
According to above-mentioned condition, can be drawn by formula (3) and formula (4) equally: Rmax=R3, Rmin=R3-R5 can calculate R3=50ohm, R5=20ohm again.
If obtain the value of temperature detection resistance with existing thermoregulation circuit be: RH=50-20*VR/ (20+VR), being changed to from 0 to 10k of VR wherein, the temperature of existing thermoregulation circuit control is with the temperature-adjusting potentiometer change curve as shown in Figure 4.As seen from Figure 4, use existing thermoregulation circuit, the resistance of temperature detection resistance RH is not linear in the extreme with the variation of potentiometer VR, and this is very difficult to use concerning the user.
Although more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, under the prerequisite that does not deviate from principle of the present invention and essence, can make various changes or modifications to these embodiments.Therefore, protection scope of the present invention is limited by appended claims.
Claims (2)
1. linear temperature adjustment circuit that utilizes temperature detection resistance to carry out the temperature equipment of temperature control, it comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, potentiometer and temperature detection resistance, after the 5th resistance and the potentiometer parallel connection respectively with the 3rd resistance, the series connection of the 4th resistance, the 3rd resistance and the first resistance, the series connection of the second resistance, the 4th resistance is connected with temperature detection resistance, it is characterized in that, this linear temperature adjustment circuit also comprises pull-up resistor, one of pull-up resistor terminates between the 3rd resistance and the first resistance, and the other end of pull-up resistor is connected with the sliding end of potentiometer.
2. the linear temperature adjustment circuit that utilizes temperature detection resistance to carry out the temperature equipment of temperature control as claimed in claim 1 is characterized in that, described temperature detection resistance and the second resistance is ground connection all.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010107998 CN102147627B (en) | 2010-02-09 | 2010-02-09 | Linear temperature adjusting circuit with temperature detection resistors for controlling temperature for temperature adjusting device |
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| CN 201010107998 CN102147627B (en) | 2010-02-09 | 2010-02-09 | Linear temperature adjusting circuit with temperature detection resistors for controlling temperature for temperature adjusting device |
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| CN102147627A CN102147627A (en) | 2011-08-10 |
| CN102147627B true CN102147627B (en) | 2013-03-27 |
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| CN109283725A (en) * | 2018-10-31 | 2019-01-29 | 安徽奕辉电子科技有限公司 | A kind of liquid crystal display with automatic temperature control system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4574200A (en) * | 1984-01-18 | 1986-03-04 | William H. Racca | Thermistor temperature control circuit |
| CN200990694Y (en) * | 2006-10-27 | 2007-12-12 | 百利通电子(上海)有限公司 | Linear temperature control circuit |
| CN101303607A (en) * | 2008-06-13 | 2008-11-12 | 百利通电子(上海)有限公司 | Positive temperature coefficient heating element temperature control method |
| CN201397122Y (en) * | 2008-03-03 | 2010-02-03 | 镇江恒驰科技有限公司 | Linear displacement difference transformer signal modulate circuit |
| CN201607654U (en) * | 2010-02-09 | 2010-10-13 | 广芯电子技术(上海)有限公司 | Linear temperature adjusting circuit of temperature adjusting device using temperature sense resistor for temperature control |
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- 2010-02-09 CN CN 201010107998 patent/CN102147627B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4574200A (en) * | 1984-01-18 | 1986-03-04 | William H. Racca | Thermistor temperature control circuit |
| CN200990694Y (en) * | 2006-10-27 | 2007-12-12 | 百利通电子(上海)有限公司 | Linear temperature control circuit |
| CN201397122Y (en) * | 2008-03-03 | 2010-02-03 | 镇江恒驰科技有限公司 | Linear displacement difference transformer signal modulate circuit |
| CN101303607A (en) * | 2008-06-13 | 2008-11-12 | 百利通电子(上海)有限公司 | Positive temperature coefficient heating element temperature control method |
| CN201607654U (en) * | 2010-02-09 | 2010-10-13 | 广芯电子技术(上海)有限公司 | Linear temperature adjusting circuit of temperature adjusting device using temperature sense resistor for temperature control |
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Address after: 200030 Shanghai Road, Leshan, building 305, room 1, building 33, room Patentee after: Core electronic technology (Shanghai) Limited by Share Ltd Address before: 200030 Shanghai Road, Leshan, building 305, room 1, building 33, room Patentee before: Broadchip Technology Group Ltd. |