CN108088472A - Signal sampling device, method and electrical equipment - Google Patents

Abstract

The invention discloses a signal sampling device, method and electrical equipment, wherein the signal sampling device includes: a sensor unit, the sensor unit includes a power supply terminal, and the sensor unit outputs a detection signal by detecting parameters to be measured in real time; an analog-to-digital conversion unit, an analog The digital conversion unit is connected to the sensor unit. The analog-to-digital conversion unit includes a reference voltage terminal. The reference voltage terminal is connected to the power supply terminal of the sensor unit and then connected to a preset reference power supply. The analog-to-digital conversion unit performs analog-to-digital conversion on the detection signal. to output digital signals; the micro control unit is connected with the analog-to-digital conversion unit, and the micro control unit obtains the actual signal value of the parameter to be measured according to the digital signal. The base reference voltage of the analog-to-digital conversion unit of the device and the sensor unit are powered by a common power supply, so that the measurement result is not affected by the reference power supply, the measurement accuracy is greatly improved, and the cost is low.

Description

Signal sampling device, method and electrical equipment

technical field

The invention relates to the technical field of electrical appliances, in particular to a signal sampling device, an electrical device and a signal sampling method.

Background technique

In the related art, the signal sampling device generally adopts the structure shown in FIG. 1 . The ADC (Analog-to-Digital Converter, analog-to-digital converter) collects the detection signal (voltage signal or current signal) output by the sensor unit, and the MCU (Microcontroller Unit, micro control unit) outputs the measured value according to the detection signal output by the ADC.

Wherein, as shown in FIG. 1 , the reference voltage of the ADC and the sensor unit have corresponding power supplies (VCC1 and VCC2 ), respectively. The measurement results of the ADC are directly related to the accuracy and stability of the power supply VCC1 of the reference voltage, and the output results of the sensor unit are directly related to the accuracy and stability of the power supply VCC2. Therefore, the measurement accuracy of the measured value output by the MCU Affected by the accuracy and stability of VCC1 and VCC2.

In order to improve the measurement accuracy, although a power supply with higher accuracy and stability can be used, the improvement of the measurement accuracy by this method is also limited, and the cost of hardware design will be increased.

Contents of the invention

The present invention is based on the inventor's understanding and research on the following issues:

In the related art, as shown in FIG. 1 , the signal sampling device may include a sensor unit, an ADC and an MCU. The sensor unit collects the intensity of the parameters to be measured (pressure, temperature, etc.) and outputs an electrical signal VO to the ADC. The ADC outputs the digital signal OUTCOAD to the MCU in the form of codes according to the electrical signal VO, so that the MCU can obtain the actual signal value Vm of the parameter to be measured according to the digital signal.

In general, the ratio of VO to VCC2 multiplied by the range is the actual signal value Vm of the parameter to be measured, namely:

Vm＝(VO/V2)*A (1)

Among them, Vm is the actual signal value of the parameter to be measured (such as pressure value, temperature value, etc.), VO is the electrical signal output by the sensor unit, A is the full-scale output value of the sensor unit, and V2 is the voltage of the power supply of the sensor unit value.

The electrical signal VO output by the sensor unit generally satisfies the following formula (2):

VO＝(OUTCODE/ACODE)*V1 (2)

Wherein, VO is the electrical signal output by the sensor unit, OUTCODE is the digital signal, ACODE is the full-scale digital signal output value, and V1 is the voltage value of the power supply of the reference voltage of the ADC. Obviously, the stability and precision of the power supply VCC1 of the reference voltage of the ADC determine the stability and precision of the digital signal OUTCODE collected by the MCU.

Substituting formula (2) into formula (1) yields the following formula (3):

Among them, Vm is the actual signal value of the parameter to be measured, OUTCODE is the digital signal, ACODE is the full-scale digital signal output value, V1 is the voltage value of the power supply of the reference voltage of the ADC, and V2 is the voltage value of the power supply of the sensor unit .

It can be seen from formula (3) that the measurement accuracy of the actual signal value Vm of the parameter to be measured is affected by the accuracy and stability of VCC1 and VCC2. In practical applications, the ripple, temperature coefficient, and zero drift of VCC1 and VCC2 will affect the accuracy and stability of VCC1 and VCC2, which will lead to inaccurate measurement results.

The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the first object of the present invention is to propose a signal sampling device, the reference voltage of the analog-to-digital conversion unit of the device and the sensor unit are powered by a common power supply, so that the measurement results will not be affected by the reference power supply , greatly improving the measurement accuracy, and the cost is low.

A second object of the present invention is to propose an electrical device.

The third object of the present invention is to provide a signal sampling method.

In order to achieve the above object, the embodiment of the first aspect of the present invention proposes a signal sampling device, including: a sensor unit, the sensor unit includes a power supply terminal, and the sensor unit outputs a detection signal by detecting the parameter to be measured in real time; A conversion unit, the analog-to-digital conversion unit is connected to the sensor unit, the analog-to-digital conversion unit includes a reference voltage terminal, and the reference voltage terminal is connected to the power supply terminal of the sensor unit and then connected to a preset reference power supply Connected, the analog-to-digital conversion unit outputs a digital signal by performing analog-to-digital conversion on the detection signal; a micro-control unit, the micro-control unit is connected to the analog-to-digital conversion unit, and the micro-control unit The signal acquires the actual signal value of the parameter to be measured.

According to the signal sampling device of the embodiment of the present invention, the sensor unit detects the parameter to be measured in real time to output the detection signal, the reference voltage terminal of the analog-to-digital conversion unit package is connected to the power supply terminal of the sensor unit and then connected to the preset reference power supply, and the analog The digital conversion unit performs analog-to-digital conversion on the detection signal to output a digital signal, and the micro-control unit obtains the actual signal value of the parameter to be measured according to the digital signal. Therefore, the reference voltage of the analog-to-digital conversion unit of the device and the sensor unit are powered by a common power supply, so that the measurement result is not affected by the reference power supply, the measurement accuracy is greatly improved, and the cost is low.

In addition, the signal sampling device proposed according to the above-mentioned embodiments of the present invention may also have the following additional technical features:

According to an embodiment of the present invention, the sensor unit comprises a temperature sensor and/or a pressure sensor.

According to an embodiment of the present invention, the parameters to be measured include temperature and/or pressure.

According to an embodiment of the present invention, the detection signal is a voltage signal or a current signal.

According to an embodiment of the present invention, the actual signal value of the parameter to be measured satisfies the following formula: Vm=(OUTCODE/ACODE)*A, wherein, Vm is the actual signal value of the parameter to be measured, and OUTCODE is the digital Signal, ACODE is the full-scale digital signal output value, and A is the full-scale output value.

To achieve the above purpose, the embodiment of the second aspect of the present invention provides an electrical device, which includes the signal sampling device described in the embodiment of the first aspect of the present invention.

In the electrical equipment of the embodiment of the present invention, through the above-mentioned signal sampling device, the reference voltage of the analog-to-digital conversion unit and the sensor unit are powered by a common power supply, so that the measurement result is not affected by the power supply, and the measurement accuracy is greatly improved. , and the cost is lower.

In order to achieve the above object, the embodiment of the third aspect of the present invention proposes a signal sampling method, including the following steps: through the sensor unit to detect the parameter to be measured in real time to output the detection signal, wherein the sensor unit includes a power supply terminal; The conversion unit performs analog-to-digital conversion on the detection signal to output a digital signal, wherein the analog-to-digital conversion unit includes a reference voltage terminal, and the reference voltage terminal is connected to the power supply terminal of the sensor unit and then connected to a preset The reference power supply is connected; the actual signal value of the parameter to be measured is obtained according to the digital signal.

According to the signal sampling method of the embodiment of the present invention, firstly, the parameter to be measured is detected in real time by the sensor unit to output the detection signal, and then the detection signal is converted by the analog-to-digital conversion unit to output a digital signal, and the reference reference of the analog-to-digital conversion unit The voltage terminal is connected to the power supply terminal of the sensor unit and then connected to the preset reference power supply. Finally, the actual signal value of the parameter to be measured is obtained according to the digital signal. Therefore, the method can make the measurement result not be affected by the power supply, greatly improves the measurement accuracy, and has low cost.

In addition, the signal sampling method proposed according to the above-mentioned embodiments of the present invention may also have the following additional technical features:

According to an embodiment of the present invention, the sensor unit includes a temperature sensor and/or a pressure sensor, and the parameter to be measured includes temperature and/or pressure.

According to an embodiment of the present invention, the detection signal is a voltage signal or a current signal.

According to an embodiment of the present invention, the actual signal value of the parameter to be measured satisfies the following formula: Vm=(OUTCODE/ACODE)*A, wherein, Vm is the actual signal value of the parameter to be measured, and OUTCODE is the digital Signal, ACODE is the full-scale digital signal output value, and A is the full-scale output value.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein,

Fig. 1 is a schematic block diagram of a signal sampling device in the related art;

Fig. 2 is a schematic block diagram of a signal sampling device according to an embodiment of the present invention; and

Fig. 3 is a flowchart of a signal sampling method according to an embodiment of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

The following describes the signal sampling device, electrical equipment and signal sampling method of the embodiments of the present invention with reference to the accompanying drawings.

Fig. 2 is a schematic block diagram of a signal sampling device according to an embodiment of the present invention. As shown in FIG. 2 , the device includes: a sensor unit 10 , an analog-to-digital conversion unit 20 and a micro control unit 30 .

Wherein, the sensor unit 10 includes a power supply terminal U1, and the sensor unit 10 outputs a detection signal VO by detecting the parameter to be measured in real time. The analog-to-digital conversion unit 20 is connected to the sensor unit 10, and the analog-to-digital conversion unit 20 includes a reference voltage terminal U2. The reference voltage terminal U2 is connected to the power supply terminal U1 of the sensor unit and then connected to the preset reference power supply VCC. The analog-to-digital conversion unit 20 outputs a digital signal OUTCOAD by performing analog-to-digital conversion on the detection signal VO. The micro control unit 30 is connected with the analog-to-digital conversion unit 20, and the micro control unit 30 obtains the actual signal value Vm of the parameter to be measured according to the digital signal.

In an embodiment of the present invention, the detection signal may be a voltage signal or a current signal. The actual signal value Vm of the parameter to be measured satisfies the following formula (4):

Vm＝(OUTCODE/ACODE)*A (4)

Among them, Vm is the actual signal value of the parameter to be measured, OUTCODE is the digital signal, ACODE is the full-scale digital signal output value, and A is the full-scale output value.

Specifically, the actual signal value Vm of the parameter to be measured generally satisfies the following formula (1):

Vm＝(VO/V2)*A (1)

Among them, Vm is the actual signal value of the parameter to be measured (such as pressure value, temperature value, etc.), VO is the electrical signal output by the sensor unit, A is the full-scale output value of the sensor unit, and V2 is the voltage of the power supply of the sensor unit value.

The electrical signal VO output by the sensor unit generally satisfies the following formula (2):

VO＝(OUTCODE/ACODE)*V1 (2)

Wherein, VO is the electrical signal output by the sensor unit, OUTCODE is a digital signal, ACODE is a full-scale digital signal output value, and V1 is the voltage value of the power supply for the reference voltage of the ADC (analog-to-digital conversion unit 20). Apparently, the stability and precision of the power supply VCC1 of the reference voltage of the ADC (analog-to-digital conversion unit 20 ) determine the stability and precision of the digital signal OUTCODE collected by the MCU (micro control unit 30 ).

Substituting formula (2) into formula (1) yields the following formula (3):

Wherein, Vm is the actual signal value of the parameter to be measured, OUTCODE is a digital signal, ACODE is a full-scale digital signal output value, V1 is the voltage value of the power supply of the reference voltage of the analog-to-digital conversion unit 20 (ADC), and V2 is the sensor The voltage value of the power supply of the unit 10.

In the embodiment of the present invention, as shown in FIG. 2, the sensor unit 10 and the analog-to-digital conversion unit 20 are powered by a common reference power supply VCC, that is, V1=V2. Therefore, the actual signal value Vm of the parameter to be measured satisfies the following formula (4):

Vm＝(OUTCODE/ACODE)*A (4)

Among them, Vm is the actual signal value of the parameter to be measured, OUTCODE is the digital signal, ACODE is the full-scale digital signal output value, and A is the full-scale output value.

It can be seen from formula (4) that the actual signal value Vm of the parameter to be measured is not affected by the power supply of the sensor unit 10 and the reference voltage of the analog-to-digital conversion unit 20, thereby avoiding the ripple and temperature coefficient of the power supply. , zero drift, etc. will affect the accuracy and stability of the measurement results, and there is no need to equip a power supply with higher accuracy and stability, which can not only improve the measurement accuracy, but also reduce hardware expenses and save costs.

It should be noted that, in the embodiment of the present invention, the sensor unit 10 may include a temperature sensor and/or a pressure sensor, and the parameters to be measured may include temperature and/or pressure. Of course, the sensor unit 10 may also include a speed sensor, a liquid level sensor, an acceleration sensor, etc., and the parameters to be measured may also include speed, liquid level, acceleration, etc., which are not specifically limited here.

According to the signal sampling device of the embodiment of the present invention, the sensor unit detects the parameter to be measured in real time to output the detection signal, the reference voltage terminal of the analog-to-digital conversion unit package is connected to the power supply terminal of the sensor unit and then connected to the preset reference power supply, and the analog The digital conversion unit performs analog-to-digital conversion on the detection signal to output a digital signal, and the micro-control unit obtains the actual signal value of the parameter to be measured according to the digital signal. Therefore, the reference voltage of the analog-to-digital conversion unit of the device and the sensor unit are powered by a common power supply, so that the measurement result is not affected by the reference power supply, the measurement accuracy is greatly improved, and the cost is low.

In addition, an embodiment of the present invention also proposes an electrical device, which includes the above-mentioned signal sampling device.

In the electrical equipment of the embodiment of the present invention, through the above-mentioned signal sampling device, the sensor unit and the analog-to-digital conversion unit are powered by a common reference power supply, so that the measurement result is not affected by the power supply, the measurement accuracy is greatly improved, and the cost is relatively low. Low.

Fig. 3 is a flowchart of a signal sampling method according to an embodiment of the present invention. As shown in Figure 3, the signal sampling method includes the following steps:

S1, the parameter to be measured is detected in real time by the sensor unit to output a detection signal VO.

Wherein, the sensor unit may include a temperature sensor and/or a pressure sensor, and the parameter to be measured may include temperature and/or pressure. Of course, the sensor unit may also include a speed sensor, a liquid level sensor, an acceleration sensor, etc., and the parameters to be measured may also include speed, liquid level, acceleration, etc., which are not specifically limited here.

The detection signal VO can be a voltage signal or a current signal.

S2, performing analog-to-digital conversion on the detection signal through an analog-to-digital conversion unit to output a digital signal OUTCOAD. Wherein, as shown in FIG. 2 , the analog-to-digital conversion unit includes a reference voltage terminal, which is connected to a power supply terminal of the sensor unit and then connected to a preset reference power supply VCC.

S3, acquiring the actual signal value Vm of the parameter to be measured according to the digital signal OUTCOAD.

In an embodiment of the present invention, the actual signal value of the parameter to be measured satisfies the following formula (4):

Vm＝(OUTCODE/ACODE)*A (4)

Among them, Vm is the actual signal value of the parameter to be measured, OUTCODE is the digital signal, ACODE is the full-scale digital signal output value, and A is the full-scale output value.

Specifically, the actual signal value Vm of the parameter to be measured generally satisfies the following formula (1):

Vm＝(VO/V2)*A (1)

Among them, Vm is the actual signal value of the parameter to be measured (such as pressure value, temperature value, etc.), VO is the electrical signal output by the sensor unit, A is the full-scale output value of the sensor unit, and V2 is the voltage of the power supply of the sensor unit value.

The electrical signal VO output by the sensor unit generally satisfies the following formula (2):

VO＝(OUTCODE/ACODE)*V1 (2)

Wherein, VO is an electrical signal output by the sensor unit, OUTCODE is a digital signal, ACODE is a full-scale digital signal output value, and V1 is a voltage value of a power supply for a reference voltage of an analog-to-digital conversion unit (ADC). Obviously, the stability and precision of the power supply VCC1 of the reference voltage of the analog-to-digital conversion unit (ADC) determine the stability and precision of the digital signal OUTCODE collected by the microcontroller unit (MCU).

Substituting formula (2) into formula (1) yields the following formula (3):

Among them, Vm is the actual signal value of the parameter to be measured, OUTCODE is the digital signal, ACODE is the full-scale digital signal output value, V1 is the voltage value of the power supply of the reference voltage of the analog-to-digital conversion unit (ADC), and V2 is the sensor unit The voltage value of the power supply.

In an embodiment of the present invention, as shown in Figure 2, the sensor unit and the analog-to-digital conversion unit use a common reference power supply VCC to supply power, that is, V1=V2, therefore, the actual signal value Vm of the parameter to be measured satisfies the following formula (4 ):

Vm＝(OUTCODE/ACODE)*A (4)

Among them, Vm is the actual signal value of the parameter to be measured, OUTCODE is the digital signal, ACODE is the full-scale digital signal output value, and A is the full-scale output value.

It can be seen from formula (4) that the actual signal value Vm of the parameter to be measured is not affected by the power supply of the sensor unit and the reference voltage of the analog-to-digital conversion unit, so that the ripple, temperature coefficient, and zero point of the power supply can be avoided. Drift, etc. affect the accuracy and stability of the measurement results, and there is no need to equip a power supply with higher accuracy and stability, which can not only improve the measurement accuracy, but also reduce hardware overhead and save costs.

According to the signal sampling method of the embodiment of the present invention, firstly, the parameter to be measured is detected in real time by the sensor unit to output the detection signal, and then the detection signal is converted by the analog-to-digital conversion unit to output a digital signal, and the reference reference of the analog-to-digital conversion unit The voltage terminal is connected to the power supply terminal of the sensor unit and then connected to the preset reference power supply. Finally, the actual signal value of the parameter to be measured is obtained according to the digital signal. Therefore, the method can make the measurement result not be affected by the reference power supply, greatly improves the measurement accuracy, and has low cost.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise specified limit. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (10)

1. A signal sampling device, characterized in that, comprising: A sensor unit, the sensor unit includes a power supply terminal, and the sensor unit outputs a detection signal by detecting the parameter to be measured in real time; An analog-to-digital conversion unit, the analog-to-digital conversion unit is connected to the sensor unit, the analog-to-digital conversion unit includes a reference voltage terminal, and the reference voltage terminal is connected to the power supply terminal of the sensor unit and then connected to a preset The reference power supply is connected, and the analog-to-digital conversion unit outputs a digital signal by performing analog-to-digital conversion on the detection signal; A micro control unit, the micro control unit is connected to the analog-to-digital conversion unit, and the micro control unit acquires the actual signal value of the parameter to be measured according to the digital signal. 2. The signal sampling device according to claim 1, wherein the sensor unit comprises a temperature sensor and/or a pressure sensor. 3. The signal sampling device according to claim 2, wherein the parameters to be measured include temperature and/or pressure. 4. The signal sampling device according to any one of claims 1-3, wherein the detection signal is a voltage signal or a current signal. 5. The signal sampling device according to claim 1, wherein the actual signal value of the parameter to be measured satisfies the following formula: Vm=(OUTCODE/ACODE)*A, Wherein, Vm is the actual signal value of the parameter to be measured, OUTCODE is the digital signal, ACODE is the full-scale digital signal output value, and A is the full-scale output value. 6. An electrical device, characterized by comprising the signal sampling device according to any one of claims 1-5. 7. A signal sampling method, characterized in that, comprising the following steps: The sensor unit is used to detect the parameter to be measured in real time to output a detection signal, wherein the sensor unit includes a power supply terminal; An analog-to-digital conversion is performed on the detection signal by an analog-to-digital conversion unit to output a digital signal, wherein the analog-to-digital conversion unit includes a reference voltage terminal, and the reference voltage terminal is connected to the power supply terminal of the sensor unit and then connected to the power supply terminal of the sensor unit. The preset reference power supply is connected; The actual signal value of the parameter to be measured is obtained according to the digital signal. 8. The signal sampling method according to claim 7, wherein the sensor unit comprises a temperature sensor and/or a pressure sensor, and the parameter to be measured comprises temperature and/or pressure. 9. The signal sampling method according to claim 7 or 8, wherein the detection signal is a voltage signal or a current signal. 10. The signal sampling method according to claim 7, wherein the actual signal value of the parameter to be measured satisfies the following formula: Vm=(OUTCODE/ACODE)*A, Wherein, Vm is the actual signal value of the parameter to be measured, OUTCODE is the digital signal, ACODE is the full-scale digital signal output value, and A is the full-scale output value.