CN217133618U - Humidity sensing circuit - Google Patents
Humidity sensing circuit Download PDFInfo
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- CN217133618U CN217133618U CN202123451992.4U CN202123451992U CN217133618U CN 217133618 U CN217133618 U CN 217133618U CN 202123451992 U CN202123451992 U CN 202123451992U CN 217133618 U CN217133618 U CN 217133618U
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- voltage
- conversion unit
- humidity
- temperature compensation
- temperature
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 4
- 238000013528 artificial neural network Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Abstract
Humidity sensing circuit relates to integrated circuit technique. The utility model discloses a circuit includes wet quick electric capacity, electric capacity-voltage conversion unit and analog-to-digital conversion unit, its characterized in that still includes a voltage stack unit and temperature compensation circuit, and temperature compensation circuit and electric capacity-voltage conversion unit connect voltage stack unit, analog-to-digital conversion unit is connected to voltage stack unit's output, temperature compensation circuit's temperature coefficient is opposite with wet quick electric capacity's temperature coefficient. The utility model discloses realize temperature compensation with minimum cost, effectively improved humidity transducer's precision.
Description
Technical Field
The utility model relates to an integrated circuit technique, in particular to humidity sensing technique.
Background
The existing humidity-sensitive capacitance temperature compensation method is complex, and comprises the modes of relying on an upper computer to operate, applying a complex digital processing circuit and the like, and the method is shown in a figure 1 and a figure 2.
The temperature and humidity sensor product SHT15 of SENSITION company adopts a curve fitting method, provides a fixed temperature compensation coefficient on a chip manual, and then calculates a final humidity value in an upper computer (singlechip/PC). The method may be referred to as SHT15_ Datasheet (www.sensirion.com). More complicated is the use of artificial neural networks for compensation. The prior art has the defects of complex technology and high cost.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a humidity sensitive capacitor temperature compensation method and humidity sensing circuit with high efficiency and low cost are provided.
The utility model provides a technical scheme that technical problem adopted is, humidity sensitive capacitance temperature compensation method, including following step:
1) the capacitance value of the humidity sensitive capacitor is converted into a voltage value,
2) performing analog-to-digital conversion on the voltage value generated in the step 1) to obtain humidity information;
characterized in that, the step 1) also comprises:
and (1, a) superposing a voltage value obtained by converting the capacitance value of the humidity-sensitive capacitor and a compensation voltage provided by a temperature compensation circuit, wherein the temperature coefficient of the temperature compensation circuit is opposite to that of the humidity-sensitive capacitor.
Further, the voltage compensation circuit is a temperature-controlled constant voltage source.
The utility model provides a humidity sensing circuit, including wet sensitive electric capacity, electric capacity-voltage conversion unit and analog-to-digital conversion unit, its characterized in that still includes a voltage stack unit and temperature compensating circuit, and temperature compensating circuit and electric capacity-voltage conversion unit connect voltage stack unit, analog-to-digital conversion unit is connected to the output of voltage stack unit, temperature compensating circuit's temperature coefficient is opposite with wet sensitive electric capacity's temperature coefficient.
The utility model discloses introduce the compensation voltage that temperature coefficient and humidity-sensitive capacitance temperature coefficient are opposite, thereby offset greatly reduced temperature to humidity measurement accuracy's influence mutually after the stack. The temperature coefficient of the compensation voltage is adjustable, so that the compensation direction and the compensation size can be flexibly adjusted, and the test and calibration in the chip production process are convenient. The utility model discloses realized temperature compensation with minimum cost, effectively improved humidity transducer's precision, compared in prior art, the utility model discloses need not to carry out the digital processing operation on the host computer, also need not complicated digital compensation circuit, very big reduction in cost.
Drawings
Fig. 1 is a schematic structural diagram of a first prior art.
Fig. 2 is a schematic structural diagram of a second prior art.
Fig. 3 is a schematic structural diagram of the present invention.
Fig. 4 is a schematic diagram of the present invention.
Detailed Description
Example 1
The embodiment is a temperature compensation method of a humidity-sensitive capacitor, which comprises the following steps:
1) converting the capacitance value of the humidity-sensitive capacitor into a voltage value, and then superposing the voltage value with a compensation voltage provided by a temperature compensation circuit, wherein the temperature coefficient of the temperature compensation circuit is opposite to that of the humidity-sensitive capacitor, and the temperature offset of the humidity-sensitive capacitor can be counteracted by selecting or adjusting the parameter of a compensation voltage source;
2) performing analog-to-digital conversion on the voltage value generated in the step 1) to obtain humidity information;
example 2
The embodiment is a humidity sensing circuit, which comprises a humidity-sensitive capacitor, a capacitor-voltage conversion unit, an analog-to-digital conversion unit, a voltage superposition unit and a temperature compensation circuit, wherein the temperature compensation circuit and the capacitor-voltage conversion unit are connected with the voltage superposition unit, the output end of the voltage superposition unit is connected with the analog-to-digital conversion unit, and the temperature coefficient of the temperature compensation circuit is opposite to that of the humidity-sensitive capacitor. The temperature compensation circuit is a temperature control voltage source.
The utility model discloses a description has clearly explained the principle and the necessary technical content of the utility model, and ordinary technical personnel can implement the utility model from this completely to the utility model discloses an each component unit (electric capacity-voltage conversion unit, voltage stack unit, temperature control voltage source etc.) belongs to ripe technique, and voltage stack unit can adopt solitary device to realize for example, also can regard as ADC (for example switched capacitor Sigma-Delta ADC) some integration together, no longer gives unnecessary details its inner structure.
Claims (1)
1. The humidity sensing circuit comprises a humidity-sensitive capacitor, a capacitor-voltage conversion unit and an analog-to-digital conversion unit, and is characterized by further comprising a voltage superposition unit and a temperature compensation circuit, wherein the temperature compensation circuit and the capacitor-voltage conversion unit are connected with the voltage superposition unit, the output end of the voltage superposition unit is connected with the analog-to-digital conversion unit, and the temperature coefficient of the temperature compensation circuit is opposite to that of the humidity-sensitive capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123451992.4U CN217133618U (en) | 2021-12-31 | 2021-12-31 | Humidity sensing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123451992.4U CN217133618U (en) | 2021-12-31 | 2021-12-31 | Humidity sensing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217133618U true CN217133618U (en) | 2022-08-05 |
Family
ID=82619509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123451992.4U Active CN217133618U (en) | 2021-12-31 | 2021-12-31 | Humidity sensing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217133618U (en) |
-
2021
- 2021-12-31 CN CN202123451992.4U patent/CN217133618U/en active Active
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Legal Events
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20240527 Granted publication date: 20220805 |
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| PP01 | Preservation of patent right |