Acquisition circuit, temperature acquisition method, circuit system and electronic equipment

Abstract

The invention provides an acquisition circuit, a temperature acquisition method, a circuit system and electronic equipment. The acquisition circuit comprises a first signal acquisition port, a plurality of second signal acquisition ports, a first acquisition unit and a plurality of second acquisition units. Wherein the first acquisition unit comprises a value taking resistor and a first pull-up resistor, the first pull-up resistor is located in the chip, a first reference voltage is connected to a first end of the first pull-up resistor, and a second end of the first pull-up resistor is connected with a first end of the value taking resistor through a first signal acquisition port; the second acquisition unit comprises a second pull-up resistor and a thermistor, the second pull-up resistor is located in the chip, the first end of the second pull-up resistor is connected with the first reference voltage, and the second end of the second pull-up resistor is connected with the first end of the thermistor through a second signal acquisition port. Therefore, the acquisition circuit can realize voltage acquisition of one end of the thermistor by using a simple circuit, so that the acquisition circuit is low in cost and simple in wiring design.

Description

Technical Field

[0001] The present invention relates to the field of electronic circuits, and in particular to an acquisition circuit, a temperature acquisition method, a circuit system and an electronic device. Background Art

[0002] The core working idea of ​​the NTC (negative temperature coefficient thermistor) acquisition circuit is to convert the resistance value change of the NTC into a voltage signal through a hardware circuit, and then reversely infer the voltage signal into a temperature value through a software algorithm.

[0003] However, the hardware cost of traditional acquisition circuits is high and the circuit design is complex. Summary of the Invention

[0004] The present invention provides an acquisition circuit, a temperature acquisition method, a circuit system and an electronic device to reduce the hardware cost and circuit design complexity of the acquisition circuit.

[0005] According to a first aspect of the present invention, there is provided a data acquisition circuit, comprising: Several signal acquisition ports for acquiring voltage signals, the signal acquisition ports including a first signal acquisition port and several second signal acquisition ports; A first acquisition unit includes a value-taking resistor and a first pull-up resistor, wherein a first end of the first pull-up resistor is connected to a first reference voltage, a second end of the first pull-up resistor is connected to the first end of the value-taking resistor via the first signal acquisition port, and a second end of the value-taking resistor is grounded; A plurality of second acquisition units, each of the second acquisition units including a second pull-up resistor and a thermistor, wherein the thermistor is configured to change its resistance value according to a sensed temperature, wherein a first end of the second pull-up resistor is connected to the first reference voltage, a second end of the second pull-up resistor is connected to the first end of the thermistor via a second signal acquisition port, and a second end of the thermistor is grounded.

[0006] Optionally, it also includes: a first filter capacitor and several second filter capacitors, the first end of the first filter capacitor is connected to the first signal acquisition port, the first end of the second filter capacitor is connected to the second signal acquisition port, and the second ends of the first filter capacitor and the second filter capacitor are both connected to the ground.

[0007] Optionally, the method further includes: a chip, wherein the first signal acquisition port, the second signal acquisition port, the first pull-up resistor and the second pull-up resistor are located in the chip.

[0008] Optionally, the resistance value of the thermistor is negatively correlated with the sensed temperature. If the temperature sensed by the thermistor is between -40°C and 125°C, the resistance value of the thermistor is between 360Ω and 370KΩ.

[0009] Optionally, the first pull-up resistor and the second pull-up resistor have the same resistance value.

[0010] According to a second aspect of the present invention, there is provided a data acquisition method, which is applied to the above-mentioned data acquisition circuit, comprising: Obtaining a resistance value R1 of the first pull-up resistor according to the voltage signal V1 collected by the first signal collection port and the resistance value Rs of the value-taking resistor; determining resistance values ​​of all second pull-up resistors according to the resistance value of the first pull-up resistor; Obtaining a resistance value of the thermistor according to a resistance value of the second pull-up resistor and a voltage signal collected by the second signal collection port; A temperature value corresponding to the thermistor is obtained according to the resistance value of the thermistor.

[0011] Optionally, obtaining the resistance value R1 of the first pull-up resistor according to the voltage signal V1 collected by the first signal collection port and the resistance value Rs of the value-taking resistor includes: , wherein Rs is used to represent the resistance value of the resistor, and Vref is used to represent the voltage value of the first reference voltage.

[0012] Optionally, obtaining the resistance value of the thermistor according to the resistance value of the second pull-up resistor and the voltage signal collected by the second signal collection port includes: ,in, Used to represent the voltage signal collected by the nth second signal collection port, Rtn is used to represent the resistance value of the nth thermistor, R2n is used to represent the resistance value of the nth second pull-up resistor, Vref is used to represent the voltage value of the first reference voltage, and n is a positive integer.

[0013] According to a third aspect of the present invention, a circuit system is provided, comprising the above-mentioned acquisition circuit.

[0014] According to a fourth aspect of the present invention, there is provided an electronic device comprising the above-mentioned circuit system.

[0015] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: The technical solution of the present invention provides an acquisition circuit comprising several signal acquisition ports for acquiring voltage signals, a first acquisition unit, and several second acquisition units. The signal acquisition ports include a first signal acquisition port and several second signal acquisition ports, and the first acquisition unit includes a value-taking resistor and a first pull-up resistor. The first end of the first pull-up resistor is connected to a first reference voltage, the second end of the first pull-up resistor is connected to the first end of the value-taking resistor via the first signal acquisition port, and the second end of the value-taking resistor is grounded. Therefore, the first pull-up resistor and the value-taking resistor form a series voltage divider circuit, and the resistance value of the first pull-up resistor can be obtained based on the resistance value of the value-taking resistor, the first reference voltage, and the voltage signal acquired by the first signal acquisition port. Furthermore, because the second acquisition unit includes a second pull-up resistor and a thermistor, the first end of the second pull-up resistor is connected to the first reference voltage, the second end of the second pull-up resistor is connected to the first end of the thermistor via a second signal acquisition port, and the second end of the thermistor is grounded, the second pull-up resistor and the corresponding thermistor form a series voltage divider circuit. Furthermore, because the resistance value of the second pull-up resistor can be obtained based on the resistance value of the first pull-up resistor, the resistance value of the thermistor can be obtained based on the resistance value of the second pull-up resistor, the first reference voltage, and the voltage signal collected by the second signal acquisition port. Finally, the temperature value sensed by the thermistor can be inferred based on the resistance value of the thermistor. In summary, the acquisition circuit can use a simple circuit to implement voltage acquisition at one end of the thermistor, resulting in low cost and simple wiring design for the acquisition circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of an acquisition circuit; Figure 2 is a schematic structural diagram of an acquisition circuit provided by an embodiment of the present invention; Figure 3 This is a flow chart of the collection method provided by an embodiment of the present invention.

[0017] Reference numerals: 1-Chip; 2-first acquisition unit; 3- Second acquisition unit; Vref-first reference voltage; R1 - first pull-up resistor; R2 - second pull-up resistor; V1-voltage signal collected by the first signal collection port; V2[n] - voltage signal collected by the nth second signal collection port; Rs-value resistor; Rt-thermistor; C1-first filter capacitor; C2-second filter capacitor. DETAILED DESCRIPTION

[0018] As mentioned in the background technology, the hardware cost of the traditional acquisition circuit is high and the circuit design is complex. Figure 1 Provide explanation.

[0019] Figure 1 It is a structural diagram of an acquisition circuit.

[0020] Please refer to Figure 1 The acquisition circuit includes a chip 10 and several acquisition modules. Each acquisition module includes a filter unit, a thermistor RT, and a voltage divider resistor R0. The chip 10 includes several voltage acquisition ports Vg for voltage acquisition and a power supply voltage Vo output port. Each voltage acquisition port Vg is connected to one end of a corresponding filter unit. The other end of the filter unit is connected to the thermistor RT and the first end of the voltage divider resistor R0. The second end of the voltage divider resistor R0 is connected to the power supply voltage Vo output port. The second end of the thermistor RT is connected to ground. The resistance value of the voltage divider resistor R0 in each acquisition module is the same.

[0021] For ease of understanding, Figure 1 In the figure, several voltage acquisition ports are divided into Vg[1] to Vg[m], where m is a positive integer.

[0022] Based on the above acquisition circuit, through the relationship The resistance value RTm of the thermistor can be obtained. The voltage output port is used to represent the power supply voltage, R0 is the resistance value of the voltage divider resistor, RTm is used to represent the resistance value of the mth thermistor, and Vg[m] is used to represent the voltage value collected by the mth voltage acquisition port. However, since each acquisition module includes a filter unit, thermistor RT, and voltage divider resistor R0, the large number of electronic components leads to high hardware costs. In addition, circuits with multiple acquisition modules are more complex, making circuit wiring design difficult.

[0023] In view of this, the technical solution of the present invention creatively proposes a collection circuit, comprising: Several signal acquisition ports for acquiring voltage signals, the signal acquisition ports including a first signal acquisition port and several second signal acquisition ports; The first acquisition unit includes a value-taking resistor and a first pull-up resistor, wherein the first pull-up resistor is located in the chip, a first end of the first pull-up resistor is connected to a first reference voltage, a second end of the first pull-up resistor is connected to the first end of the value-taking resistor via the first signal acquisition port, and a second end of the value-taking resistor is grounded; The second acquisition unit includes a second pull-up resistor and a thermistor. The thermistor is used to change its own resistance value according to the sensed temperature. The second pull-up resistor is located in the chip. The first end of the second pull-up resistor is connected to the first reference voltage. The second end of the second pull-up resistor is connected to the first end of the thermistor through a second signal acquisition port. The second end of the thermistor is grounded.

[0024] The acquisition circuit can realize voltage acquisition of one end of the thermistor by using a simple circuit, so that the acquisition circuit has low cost and simple wiring design.

[0025] The following will provide a clear and complete description of the embodiments of the present invention, in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, and not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. The terms "first," "second," "third," and so on, in the specification and claims of the present invention, and in the accompanying drawings, are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that such terms are interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product, or apparatus.

[0026] Please refer to Figure 2 The acquisition circuit includes: a plurality of signal acquisition ports for acquiring voltage signals, a first acquisition unit 2 and a plurality of second acquisition units 3.

[0027] The plurality of signal acquisition ports for acquiring voltage signals include a first signal acquisition port and a plurality of second signal acquisition ports.

[0028] The first acquisition unit 2 includes a value-taking resistor Rs and a first pull-up resistor R1. The first end of the first pull-up resistor R1 is connected to the first reference voltage Vref, the second end of the first pull-up resistor R1 is connected to the first end of the value-taking resistor Rs through the first signal acquisition port, and the second end of the value-taking resistor Rs is grounded.

[0029] The second acquisition unit 3 includes a second pull-up resistor R2 and a thermistor Rt. The thermistor Rt is used to change its own resistance value according to the sensed temperature. The first end of the second pull-up resistor R2 is connected to the first reference voltage Vref, the second end of the second pull-up resistor R2 is connected to the first end of the thermistor Rt through a second signal acquisition port, and the second end of the thermistor Rt is grounded.

[0030] In this embodiment, the resistance of the thermistor Rt is negatively correlated with the sensed temperature. That is, the higher the ambient temperature of the thermistor Rt, the lower the resistance of the thermistor Rt itself. If the temperature sensed by the thermistor Rt is between -40°C and 125°C, the resistance of the thermistor Rt is between 360Ω and 370KΩ.

[0031] Among them, the first signal acquisition port, the second signal acquisition port, the first pull-up resistor R1 and the second pull-up resistor R2 are located inside the chip 1, and correspondingly, the value resistor Rs and the thermistor Rt are located outside the chip 1. Therefore, the circuits inside and outside the chip are relatively simple, which makes the hardware cost of the circuit low and the wiring design simple.

[0032] In this embodiment, the first pull-up resistor R1 and the second pull-up resistor R2 have the same resistance value.

[0033] In this embodiment, the acquisition circuit also includes a first filter capacitor C1 and several second filter capacitors C2, the first end of the first filter capacitor C1 is connected to the first signal acquisition port, the first end of the second filter capacitor C2 is connected to the second signal acquisition port, and the second ends of the first filter capacitor C1 and the second filter capacitor C2 are both connected to the ground. Specifically, the first filter capacitor C1, the first pull-up resistor R1 and the value resistor Rs constitute a first filter circuit, wherein, according to the Thevenin equivalent theorem, the equivalent resistance of the first filter circuit is the parallel resistance of the first pull-up resistor R1 and the value resistor Rs, then the equivalent resistance of the first filter circuit is less than either the resistance value of the first pull-up resistor R1 or the resistance value of the value resistor Rs; similarly, the second filter capacitor C2, the second pull-up resistor R2 and the thermistor Rt constitute a second filter circuit, wherein, according to the Thevenin equivalent theorem, the equivalent resistance of the second filter circuit is the parallel resistance of the second pull-up resistor R2 and the thermistor Rt, then the equivalent resistance of the second filter circuit is less than either the resistance value of the second pull-up resistor R2 or the resistance value of the thermistor Rt. In summary, since the time constant of the acquisition circuit is the product of the equivalent resistance of the first filter circuit and the capacitance value of the first filter capacitor C1, or the product of the equivalent resistance of the second filter circuit and the capacitance value of the second filter capacitor C2, and the equivalent resistance of the first filter circuit is less than either the resistance value of the first pull-up resistor R1 or the resistance value of the value resistor Rs, and the equivalent resistance of the second filter circuit is less than either the resistance value of the second pull-up resistor R2 or the resistance value of the thermistor Rt, the capacitance value of the first filter capacitor C1 or the second filter capacitor C2 can take a larger value, so that the acquisition circuit can have higher acquisition accuracy.

[0034] In summary, an acquisition circuit provided in an embodiment of the present invention includes several signal acquisition ports for acquiring voltage signals, a first acquisition unit 2, and several second acquisition units 3. The signal acquisition ports include a first signal acquisition port and several second signal acquisition ports. The first acquisition unit 2 includes a value-taking resistor Rs and a first pull-up resistor R1. The first end of the first pull-up resistor R1 is connected to a first reference voltage Vref. The second end of the first pull-up resistor R1 is connected to the first end of the value-taking resistor Rs via the first signal acquisition port. The second end of the value-taking resistor Rs is grounded. Therefore, the first pull-up resistor R1 and the value-taking resistor R1 form a series voltage divider circuit. The resistance value of the first pull-up resistor R1 can be obtained based on the resistance value of the value-taking resistor Rs, the first reference voltage Vref, and the voltage signal V1 acquired by the first signal acquisition port. Furthermore, since the second acquisition unit 3 includes a second pull-up resistor R2 and a thermistor Rt, the first end of the second pull-up resistor R2 is connected to the first reference voltage Vref, the second end of the second pull-up resistor R2 is connected to the first end of the thermistor Rt via a second signal acquisition port, and the second end of the thermistor Rt is grounded, the second pull-up resistor R2 and the corresponding thermistor Rt form a series voltage divider circuit. Furthermore, since the resistance value of the second pull-up resistor R2 can be obtained based on the resistance value of the first pull-up resistor R1, the resistance value of the thermistor Rt can be obtained based on the resistance value of the second pull-up resistor R2, the first reference voltage Vref, and the voltage signal V2 collected by the second signal acquisition port. Finally, the temperature value sensed by the thermistor Rt can be inferred based on the resistance value of the thermistor Rt. In summary, the acquisition circuit can use a simple circuit to implement voltage acquisition at one end of the thermistor, making the acquisition circuit low-cost and simple in wiring design.

[0035] Please refer to Figure 3 The embodiment of the present invention further provides a temperature acquisition method, which is applied to the above acquisition circuit, comprising: S1: Obtaining a resistance value R1 of a first pull-up resistor according to a voltage signal V1 collected by a first signal collection port and a resistance value Rs of the value-taking resistor.

[0036] In this embodiment, the resistance value R1 of the first pull-up resistor is obtained according to the voltage signal V1 collected by the first signal collection port and the resistance value Rs of the value-taking resistor, including: , wherein Rs is used to represent the resistance value of the resistor, and Vref is used to represent the voltage value of the first reference voltage.

[0037] S2: Determine the resistance value R2 of all the second pull-up resistors according to the resistance value R1 of the first pull-up resistor.

[0038] In this embodiment, the resistance value R1 of the first pull-up resistor is equal to the resistance value R2 of the second pull-up resistor.

[0039] S3: Obtaining a resistance value Rt of the thermistor according to the resistance value R2 of the second pull-up resistor and the voltage signal V2 collected by the second signal collection port.

[0040] In this embodiment, the resistance value Rt of the thermistor is obtained according to the resistance value R2 of the second pull-up resistor and the voltage signal V2 collected by the second signal collection port, including: ,in, Used to represent the voltage signal collected by the nth second signal collection port, Rtn is used to represent the resistance value of the nth thermistor, R2n is used to represent the resistance value of the nth second pull-up resistor, Vref is used to represent the voltage value of the first reference voltage, and n is a positive integer.

[0041] S4: Obtaining a temperature value corresponding to the thermistor according to the resistance value Rt of the thermistor.

[0042] The temperature value corresponding to the thermistor can be obtained according to a mathematical model of the resistance-temperature corresponding to the thermistor and the resistance value of the thermistor.

[0043] Correspondingly, an embodiment of the present invention further provides a circuit system, including the above-mentioned acquisition circuit.

[0044] Correspondingly, an embodiment of the present invention further provides an electronic device, comprising the above-mentioned circuit system.

[0045] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A collection circuit, characterized in that: include: Several signal acquisition ports for acquiring voltage signals, the signal acquisition ports including a first signal acquisition port and several second signal acquisition ports; A first acquisition unit includes a value-taking resistor and a first pull-up resistor, wherein a first end of the first pull-up resistor is connected to a first reference voltage, a second end of the first pull-up resistor is connected to the first end of the value-taking resistor via the first signal acquisition port, and a second end of the value-taking resistor is grounded; A plurality of second acquisition units, each of the second acquisition units including a second pull-up resistor and a thermistor, wherein the thermistor is configured to change its resistance value according to a sensed temperature, wherein a first end of the second pull-up resistor is connected to the first reference voltage, a second end of the second pull-up resistor is connected to the first end of the thermistor via a second signal acquisition port, and a second end of the thermistor is grounded.

2. The acquisition circuit according to claim 1, characterized in that: Also includes: A first filter capacitor and several second filter capacitors, the first end of the first filter capacitor is connected to the first signal acquisition port, the first end of the second filter capacitor is connected to the second signal acquisition port, and the second ends of the first filter capacitor and the second filter capacitor are both connected to the ground.

3. The acquisition circuit according to claim 1, characterized in that: Also includes: The chip, the first signal acquisition port, the second signal acquisition port, the first pull-up resistor and the second pull-up resistor are located inside the chip.

4. The acquisition circuit according to claim 1, characterized in that: The resistance value of the thermistor is negatively correlated with the sensed temperature. If the temperature sensed by the thermistor is between -40°C and 125°C, the resistance value of the thermistor is between 360Ω and 370KΩ.

5. The acquisition circuit according to claim 1, characterized in that: The first pull-up resistor and the second pull-up resistor have the same resistance value.

6. A temperature collection method, characterized in that: The acquisition circuit according to any one of claims 1 to 5 comprises: Obtaining a resistance value R1 of the first pull-up resistor according to the voltage signal V1 collected by the first signal collection port and the resistance value Rs of the value-taking resistor; determining resistance values ​​of all second pull-up resistors according to the resistance value of the first pull-up resistor; Obtaining a resistance value of the thermistor according to a resistance value of the second pull-up resistor and a voltage signal collected by the second signal collection port; A temperature value corresponding to the thermistor is obtained according to the resistance value of the thermistor.

7. The temperature acquisition method according to claim 6, characterized in that: Obtaining the resistance value R1 of the first pull-up resistor according to the voltage signal V1 collected by the first signal collection port and the resistance value Rs of the value-taking resistor includes: , wherein Rs is used to represent the resistance value of the resistor, and Vref is used to represent the voltage value of the first reference voltage.

8. The temperature acquisition method according to claim 6, characterized in that: Obtaining the resistance value of the thermistor according to the resistance value of the second pull-up resistor and the voltage signal collected by the second signal collection port includes: ,in, Used to represent the voltage signal collected by the nth second signal collection port, Rtn is used to represent the resistance value of the nth thermistor, R2n is used to represent the resistance value of the nth second pull-up resistor, Vref is used to represent the voltage value of the first reference voltage, and n is a positive integer.

9. A circuit system, characterized in that: The device comprises the acquisition circuit according to any one of claims 1 to 5.

10. An electronic device, characterized in that: comprising the circuit system of claim 9.

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