CN220454727U - Low-cost temperature sampling circuit - Google Patents
Low-cost temperature sampling circuit Download PDFInfo
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- CN220454727U CN220454727U CN202321305138.3U CN202321305138U CN220454727U CN 220454727 U CN220454727 U CN 220454727U CN 202321305138 U CN202321305138 U CN 202321305138U CN 220454727 U CN220454727 U CN 220454727U
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- temperature
- voltage dividing
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- sampling circuit
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- 238000005070 sampling Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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- Control Of Voltage And Current In General (AREA)
Abstract
The utility model discloses a low-cost temperature sampling circuit, which comprises two temperature detection resistors, wherein the two temperature detection resistors are connected with an MCU, and the two temperature detection resistors are R1 and R4 respectively; r1 is connected with R2 in series, and R4 is connected with R3 in series. The R1 is arranged on the high side of the voltage dividing circuit, and the R4 is arranged on the low side of the voltage dividing circuit. R2 is a first voltage dividing resistor, and R3 is a second voltage dividing resistor. The circuit can realize that the digital power supply samples the working temperature, can carry out temperature-related compensation, overtemperature protection and the like, can report the working temperature data through a digital bus, and is convenient for people to use.
Description
Technical Field
The utility model relates to the field of control of power supply systems, in particular to a low-cost temperature sampling circuit.
Background
The existing digital power supply can not realize the sampling of the working temperature, the temperature-related compensation, the over-temperature protection and the like, and the working temperature data can not be reported through a digital bus, so that the low-cost temperature sampling circuit is provided.
Disclosure of Invention
The present utility model is directed to solving the above-mentioned problems of the prior art by providing a low-cost temperature sampling circuit.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the low-cost temperature sampling circuit comprises two temperature detection resistors, wherein the two temperature detection resistors are connected with an MCU, and the two temperature detection resistors are R1 and R4 respectively; r1 is connected with R2 in series, and R4 is connected with R3 in series.
As a preferable embodiment of the present utility model, the R1 is disposed at a high side of the voltage dividing circuit, and the R4 is disposed at a low side of the voltage dividing circuit.
As a preferable technical scheme of the utility model, R2 is a first voltage dividing resistor, and R3 is a second voltage dividing resistor.
The beneficial effects of the utility model are as follows: the circuit can realize that the digital power supply samples the working temperature, can carry out temperature-related compensation, overtemperature protection and the like, can report the working temperature data through a digital bus, and is convenient for people to use.
Drawings
FIG. 1 is a circuit diagram of the present utility model;
FIG. 2 is a linear graph of the present utility model at an NTC device temperature in the range of 20-120 ℃;
fig. 3 is a linear graph of the present utility model at an NTC device temperature range of-40 c to 60 c.
Detailed Description
The preferred embodiments of the present utility model will be described in detail below with reference to the attached drawings so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present utility model.
Examples: referring to fig. 1, the present utility model provides a technical solution: the low-cost temperature sampling circuit comprises two temperature detection resistors, wherein the two temperature detection resistors are connected with an MCU, and the two temperature detection resistors are R1 and R4 respectively; r1 is connected with R2 in series, and R4 is connected with R3 in series.
R1 is arranged on the high side of the voltage dividing circuit, and R4 is arranged on the low side of the voltage dividing circuit.
R2 is a first voltage dividing resistor, and R3 is a second voltage dividing resistor.
Working principle: the low-cost temperature sampling circuit detects working temperature through two temperature detection resistors NTC, the MCU carries out digital monitoring after carrying out ADC sampling on detected temperature signals, one path of temperature sampling NTC is arranged on the high side of the voltage dividing circuit, one path of temperature sampling NTC is arranged on the low side of the voltage dividing circuit, and numerical operation is carried out on two paths of temperature sampling ADC results to obtain the current working temperature; the NTC resistor adopted has low cost and stable performance, and is convenient for people to use.
As shown in fig. 2, for the output voltage VOUT of the temperature sampling circuit with the NTC placed on the low side, there is a higher linearity when the temperature range of the NTC device is 20-120 ℃, and the operating temperature can be obtained from the ADC detection voltage VOUT by a simple linear formula or a look-up table.
As shown in fig. 3, for the output voltage VOUT of the temperature sampling circuit with the NTC at the high side, there is a high linearity when the temperature range of the NTC device is-40-60 ℃, and the operating temperature can be obtained from the ADC detection voltage VOUT by a simple linear formula or a look-up table.
After the MCU obtains ADC results of two paths of temperature sampling, one path of ADC value and preset value of the high-side NTC temperature sampling circuit or the low-side NTC temperature sampling circuit is selected as an input channel of the current working temperature to calculate the working temperature, and then data bus temperature reporting and over-temperature protection judgment are carried out.
The circuit can realize that the digital power supply samples the working temperature, can carry out temperature-related compensation, overtemperature protection and the like, can report the working temperature data through a digital bus, and is convenient for people to use.
The foregoing examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.
Claims (3)
1. The utility model provides a low-cost temperature sampling circuit, includes two temperature detection resistance, its characterized in that: the two temperature detection resistors are connected with the MCU, and are R1 and R4 respectively; r1 is connected with R2 in series, and R4 is connected with R3 in series.
2. A low cost temperature sampling circuit according to claim 1, wherein: the R1 is arranged on the high side of the voltage dividing circuit, and the R4 is arranged on the low side of the voltage dividing circuit.
3. A low cost temperature sampling circuit according to claim 1, wherein: r2 is a first voltage dividing resistor, and R3 is a second voltage dividing resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321305138.3U CN220454727U (en) | 2023-05-26 | 2023-05-26 | Low-cost temperature sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321305138.3U CN220454727U (en) | 2023-05-26 | 2023-05-26 | Low-cost temperature sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220454727U true CN220454727U (en) | 2024-02-06 |
Family
ID=89734228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321305138.3U Active CN220454727U (en) | 2023-05-26 | 2023-05-26 | Low-cost temperature sampling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220454727U (en) |
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2023
- 2023-05-26 CN CN202321305138.3U patent/CN220454727U/en active Active
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