CN204881902U - A temperature measurement circuit for single AD mouth - Google Patents
A temperature measurement circuit for single AD mouth Download PDFInfo
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- CN204881902U CN204881902U CN201520596222.4U CN201520596222U CN204881902U CN 204881902 U CN204881902 U CN 204881902U CN 201520596222 U CN201520596222 U CN 201520596222U CN 204881902 U CN204881902 U CN 204881902U
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Abstract
The utility model provides a temperature measurement circuit for single AD mouth, includes thermistor TH1 and thermistor TH2 to and the list that links to each other with two a thermistor AD sampling port, its characterized in that: thermistor TH1 and thermistor TH2 electricity are connected the back and are linked to each other with signal battery VCC through pull -up resistance R1 to be connected to AD sampling port, thermistor TH1's the other end passes through switch element Q1 ground connection, switch element Q1's control end is connected to PWM signal output part through resistance R3, thermistor TH2's the other end passes through switch element Q2 ground connection, switch element Q2's control end is connected to signal battery VCC through pull -up resistance R2, just switch element Q2's control end is still continuous with switch element Q3's output, switch element Q3's control end is connected to PWM signal output part through resistance R6. The utility model discloses can solve effectively that to have some IC chips configurations among the starting circuit limited, defect that AD mouth quantity is not enough, and the circuit is simple, advantage with low costs.
Description
Technical field
The utility model relates to testing circuit field, specifically a kind of temperature sensing circuit for single AD mouth.
Background technology
At present, a lot of household appliances, in the process of work, are all read from the electric signal of NTC by AD mouth, according to certain conversion relation, detect current NTC(thermistor) real time temperature.Generally, a corresponding AD mouth of NTC.Some shortcomings common in current start-up circuit are, some IC chip configuration are limited, and AD mouth quantity is inadequate, cannot accomplish multiple voltage of sampling, namely due to AD mouth quantity resource-constrained, cause the demand that cannot meet detection signal.When occurring the real time temperature needing detection two NTC, when but only having an AD mouth, how this carries out the detection of temperature, is the problem that a lot of technician faces.
Summary of the invention
For above-mentioned prior art, the technical problems to be solved in the utility model is to provide a kind of temperature sensing circuit for single AD mouth, open two respectively by PWM low and high level and control metal-oxide-semiconductor, different temperature sensings is distinguished with the sampled voltage realizing detecting respectively two NTC, by certain conversion relation, calculate temperature value.
In order to solve the problem; temperature sensing circuit for single AD mouth of the present utility model; comprise thermistor TH1 and thermistor TH2; and the single AD sample port to be connected with two thermistors; described thermistor TH1 is connected with power supply signal VCC by pull-up resistor R1 after being electrically connected with thermistor TH2, and is connected to AD sample port; The other end of thermistor TH1 is by on-off element Q1 ground connection, and the control end of described on-off element Q1 is connected to pwm signal output terminal by resistance R3; The other end of described thermistor TH2 is by on-off element Q2 ground connection, the control end of described on-off element Q2 is connected to power supply signal VCC by pull-up resistor R2, and the control end of described on-off element Q2 is also connected with the output terminal of on-off element Q3, the control end of described on-off element Q3 is connected to pwm signal output terminal by resistance R6.
Preferably, described on-off element is triode, metal-oxide-semiconductor, Darlington transistor or to pipe.
Compared with prior art, the utility model tool has the following advantages:
One, effectively can solve in start-up circuit that to there are some IC chip configuration limited, the defect that AD mouth quantity is inadequate, uses an AD mouth just can detect two sampled voltages.
Two, circuit is simple, little to cost impact, and if use house dog or other PWM mouth carry out PWM multiplexing functions, more can reach the object reducing production cost.
Accompanying drawing explanation
Fig. 1 is the temperature sensing circuit schematic diagram for single AD mouth that the utility model is implemented.
Embodiment
In order to allow those skilled in the art understand the technical solution of the utility model better, below in conjunction with accompanying drawing, the utility model is further elaborated.
Embodiment of the present utility model as shown in Figure 1; a kind of temperature sensing circuit for single AD mouth; comprise thermistor TH1 and thermistor TH2; and the single AD sample port to be connected with two thermistors; thermistor TH1 is connected with power supply signal VCC by pull-up resistor R1 after being electrically connected with thermistor TH2, and is connected to AD sample port; The other end of thermistor TH1 is by on-off element Q1 ground connection, and the control end of described on-off element Q1 is connected to pwm signal output terminal by resistance R3; The other end of described thermistor TH2 is by on-off element Q2 ground connection, the control end of described on-off element Q2 is connected to power supply signal VCC by pull-up resistor R2, and the control end of described on-off element Q2 is also connected with the output terminal of on-off element Q3, the control end of described on-off element Q3 is connected to pwm signal output terminal by resistance R6.
On-off element Q1 ~ Q3 is triode, metal-oxide-semiconductor, Darlington transistor or to pipe.In the present embodiment, on-off element Q1 and on-off element Q2 uses metal-oxide-semiconductor, and on-off element Q3 uses triode.
Temperature sensing circuit in the present embodiment is the alternately break-make by control, metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2, makes temperature detection AD mouth can detect the sampled voltage of thermistor TH1 and thermistor TH2 respectively.By controlling metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2, opening when making them different, when detecting the voltage of thermistor TH1, closing the control metal-oxide-semiconductor Q2 of thermistor TH2, when detecting thermistor TH2 voltage, closing the control metal-oxide-semiconductor Q1 of thermistor TH1.IC chip internal, by program design, calculates the temperature of thermistor TH1 and thermistor TH2 respectively according to the sampled value of Different periods.
In the present embodiment, the port exporting PWM electric signal in IC chip can directly have in multiplex system the house dog used or other PWM mouth function, then more can reduce the quantity demand of I/O mouth.
It should be noted that, in the present embodiment, do not launch the place of carrying out setting forth in detail, being those skilled in the art can realize according to existing common practise and practical experience.
The above is better embodiment of the present utility model, not does any pro forma restriction to the utility model.It should be noted that; when not deviating from the utility model spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the utility model, but these change and are out of shape the protection domain that all should belong to the claim appended by the utility model.
Claims (2)
1. the temperature sensing circuit for single AD mouth; comprise thermistor TH1 and thermistor TH2; and the single AD sample port to be connected with two thermistors; it is characterized in that: described thermistor TH1 is connected with power supply signal VCC by pull-up resistor R1 after being electrically connected with thermistor TH2, and is connected to AD sample port; The other end of thermistor TH1 is by on-off element Q1 ground connection, and the control end of described on-off element Q1 is connected to pwm signal output terminal by resistance R3; The other end of described thermistor TH2 is by on-off element Q2 ground connection, the control end of described on-off element Q2 is connected to power supply signal VCC by pull-up resistor R2, and the control end of described on-off element Q2 is also connected with the output terminal of on-off element Q3, the control end of described on-off element Q3 is connected to pwm signal output terminal by resistance R6.
2. the temperature sensing circuit for single AD mouth according to claim 1, is characterized in that, described on-off element is triode, metal-oxide-semiconductor, Darlington transistor or to pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520596222.4U CN204881902U (en) | 2015-08-10 | 2015-08-10 | A temperature measurement circuit for single AD mouth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520596222.4U CN204881902U (en) | 2015-08-10 | 2015-08-10 | A temperature measurement circuit for single AD mouth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204881902U true CN204881902U (en) | 2015-12-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520596222.4U Active CN204881902U (en) | 2015-08-10 | 2015-08-10 | A temperature measurement circuit for single AD mouth |
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| CN (1) | CN204881902U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110221559A (en) * | 2019-06-11 | 2019-09-10 | 珠海格力电器股份有限公司 | pin multiplexing circuit and control method thereof |
-
2015
- 2015-08-10 CN CN201520596222.4U patent/CN204881902U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110221559A (en) * | 2019-06-11 | 2019-09-10 | 珠海格力电器股份有限公司 | pin multiplexing circuit and control method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |