CN212302329U - Analog voltage output circuit and sensor - Google Patents
Analog voltage output circuit and sensor Download PDFInfo
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- CN212302329U CN212302329U CN202021233858.XU CN202021233858U CN212302329U CN 212302329 U CN212302329 U CN 212302329U CN 202021233858 U CN202021233858 U CN 202021233858U CN 212302329 U CN212302329 U CN 212302329U
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Abstract
The embodiment of the utility model discloses analog voltage output circuit and sensor, this circuit includes: the device comprises a reference voltage module, a control module and an analog voltage following module; the reference voltage module is used for providing reference voltage for the control module; the sampling voltage input end of the control module is electrically connected with the reference voltage output end of the reference voltage module; the control module is used for generating an analog voltage according to the reference voltage; the voltage input end of the analog voltage following module is electrically connected with the analog voltage output end of the control module, the first power end of the analog voltage following module is connected with the first power signal, the second power end of the analog voltage following module is connected with the second power signal, and the analog voltage following module is used for outputting the analog voltage output by the control module and carrying out feedback regulation on the output voltage. The analog voltage output circuit can improve the accuracy of the output of the analog voltage signal.
Description
Technical Field
The embodiment of the utility model provides a relate to electron technical field, especially, relate to an analog voltage output circuit and sensor.
Background
Analog voltage signals are widely used in circuit design, and the output precision of the analog voltage signals directly influences the precision of a sensor or a circuit. For example, if the accuracy of the analog voltage signal output from the analog voltage type gas pressure sensor is not high, the detection accuracy of the pressure sensor is directly affected, and the performance of the sensor is affected. From this, it is important to improve the output accuracy of the analog voltage signal.
SUMMERY OF THE UTILITY MODEL
The utility model provides an analog voltage output circuit and sensor to improve analog voltage signal's output precision.
In a first aspect, an embodiment of the present invention provides an analog voltage output circuit, which includes: the device comprises a reference voltage module, a control module and an analog voltage following module;
the reference voltage module comprises a first power supply input end, a second power supply input end and a reference voltage output end, the first power supply input end of the reference voltage module is connected with a first power supply signal, and the second power supply input end of the reference voltage module is connected with a second power supply signal; the reference voltage module is used for providing reference voltage for the control module;
the control module comprises a first power supply input end, a second power supply input end, a sampling voltage input end and an analog voltage output end, the first power supply input end of the control module is connected with the first power supply signal, the second power supply input end of the control module is connected with the second power supply signal, and the sampling voltage input end of the control module is electrically connected with the reference voltage output end of the reference voltage module; the control module is used for generating an analog voltage according to the reference voltage;
the analog voltage following module comprises a voltage input end, a first power end, a second power end and an analog voltage output end, the voltage input end of the analog voltage following module is electrically connected with the analog voltage output end of the control module, the first power end of the analog voltage following module is connected to the first power signal, the second power end of the analog voltage following module is connected to the second power signal, and the analog voltage following module is used for outputting the analog voltage output by the control module and performing feedback regulation on the output voltage.
In a second aspect, an embodiment of the present invention further provides an analog voltage calculating method, where the calculating method employs the analog voltage output circuit as described in the first aspect;
the calculation method comprises the following steps:
acquiring a theoretical reference voltage input value and a theoretical reference voltage output value;
sampling a voltage value at a sampling voltage input end of the control module to serve as a sampling voltage value;
and determining the analog voltage value output by the analog voltage output end of the control module according to the theoretical reference voltage input value, the theoretical reference voltage output value and the sampling voltage value.
In a third aspect, embodiments of the present invention further provide an analog voltage sensor, which includes an analog voltage output circuit as described in the first aspect.
The utility model discloses an analog voltage output circuit is provided, this circuit includes: the device comprises a reference voltage module, a control module and an analog voltage following module; the reference voltage module comprises a first power supply input end, a second power supply input end and a reference voltage output end, the first power supply input end of the reference voltage module is connected with a first power supply signal, and the second power supply input end of the reference voltage module is connected with a second power supply signal; the reference voltage module is used for providing reference voltage for the control module; the control module comprises a first power supply input end, a second power supply input end, a sampling voltage input end and an analog voltage output end, wherein the first power supply input end of the control module is connected with a first power supply signal, the second power supply input end of the control module is connected with a second power supply signal, and the sampling voltage input end of the control module is electrically connected with the reference voltage output end of the reference voltage module; the control module is used for generating an analog voltage according to the reference voltage; the analog voltage following module comprises a voltage input end, a first power end, a second power end and an analog voltage output end, the voltage input end of the analog voltage following module is electrically connected with the analog voltage output end of the control module, the first power end of the analog voltage following module is connected with a first power signal, the second power end of the analog voltage following module is connected with a second power signal, and the analog voltage following module is used for outputting the analog voltage output by the control module. Therefore, the control module collects the reference voltage signal output by the reference voltage module and outputs the reference voltage signal through the analog voltage output end, and the analog voltage signal output by the control module is output through the following analog voltage following module, so that the output precision of the analog voltage signal can be improved.
Drawings
Fig. 1 is a schematic structural diagram of an analog voltage output circuit according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an analog voltage output circuit according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of an analog voltage output circuit according to a third embodiment of the present invention;
fig. 4 is a flowchart of an analog voltage calculating method according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic structural diagram of an analog voltage output circuit according to an embodiment of the present invention, referring to fig. 1, the analog voltage output circuit includes: a reference voltage module 100, a control module 200 and an analog voltage following module 300;
the reference voltage module 100 comprises a first power input end A1, a second power input end A2 and a reference voltage output end A3, wherein the first power input end A1 of the reference voltage module 100 is connected with a first power signal ADD, and the second power input end A2 of the reference voltage module 100 is connected with a second power signal GND; the reference voltage module 100 is used for providing a reference voltage to the control module 200;
the control module 200 comprises a first power input end B1, a second power input end B2, a sampling voltage input end B3 and an analog voltage output end B4, the first power input end B1 of the control module 200 is connected to a first power signal ADD, the second power input end B2 of the control module 200 is connected to a second power signal GND, and the sampling voltage input end B3 of the control module 200 is electrically connected with a reference voltage output end A3 of the reference voltage module 100; the control module 200 is configured to generate an analog voltage according to a reference voltage;
the analog voltage follower module 300 comprises a voltage input end C1, a first power end C2, a second power end C3 and an analog voltage output end C4, the voltage input end C1 of the analog voltage follower module 300 is electrically connected with the analog voltage output end B4 of the control module 200, the first power end C2 of the analog voltage follower module 300 is connected to a first power signal ADD, the second power end C3 of the analog voltage follower module 300 is connected to a second power signal GND, and the analog voltage follower module 300 is used for outputting the analog voltage output by the control module 200.
The first power signal ADD may be a voltage signal input from the positive terminal of the power supply, and the second power signal GND may be a ground signal. The control module 200 may be a single chip.
In the technical solution of this embodiment, the operating principle of the analog voltage output circuit is as follows: referring to fig. 1, a reference voltage output terminal a3 of the reference voltage module 100 provides a reference voltage signal to the control module 200, a sampling voltage input terminal B3 of the control module 200 samples the reference voltage signal, the control module 200 processes the collected reference voltage signal and outputs the processed reference voltage signal through an analog voltage output terminal B4, and an analog voltage signal output by an analog voltage output terminal B4 is input to a voltage input terminal C1 of the analog voltage follower module 300 and is output through an analog voltage output terminal C4 of the analog voltage follower module 300.
The process of processing the acquired reference voltage signal by the control module 200 is as follows: the control module can calculate the analog voltage value output by the analog voltage output end of the reference voltage signal according to the theoretical input value and the theoretical output value of the reference voltage signal and the sampled voltage value, the analog voltage value can be calculated according to the following formula,
wherein, V1 is a theoretical reference voltage input value, V2 is a theoretical reference voltage output value, AD1 is a sampling voltage value, and DA1 is an analog voltage value output by an analog voltage output terminal.
The technical solution of this embodiment is to provide an analog voltage output circuit, which includes: the device comprises a reference voltage module, a control module and an analog voltage following module; the reference voltage module is used for providing reference voltage for the control module; the sampling voltage input end of the control module is electrically connected with the reference voltage output end of the reference voltage module, and the control module is used for generating analog voltage according to the reference voltage; the voltage input end of the analog voltage following module is electrically connected with the analog voltage output end of the control module, and the analog voltage following module is used for outputting the analog voltage output by the control module and carrying out feedback regulation on the output voltage. Therefore, the analog voltage output by the control module is output through the analog voltage following module, and the output analog voltage is subjected to feedback regulation so as to meet the requirement of analog voltage output, so that the accuracy of analog voltage signal output can be improved.
Example two
Fig. 2 is a schematic structural diagram of an analog voltage output circuit provided in the second embodiment of the present invention, and referring to fig. 2, the reference voltage module further includes a zener diode 120 and a first resistor 110 on the basis of the first embodiment;
a first end of the first resistor 110 is used as a first power input end a1 of the reference voltage module 100, a first power signal ADD is input, and a second end of the first resistor 110 is electrically connected with a cathode of the zener diode 120;
the anode of the zener diode 120 is connected to the second power signal GDN, and the anodes of the zener diode 120 are electrically connected to the second power input terminal a2 of the reference voltage module 100 and the second power input terminal B2 of the control module 200, respectively.
The voltage stabilizing diode utilizes the reverse breakdown state of the pn junction, the current of the voltage stabilizing diode can be changed in a large range, and the voltage of the voltage stabilizing diode is basically unchanged, so that the voltage stabilizing diode can play a role in stabilizing voltage and can be used for outputting reference voltage. The first resistor is connected between the voltage stabilizing diode and the first power supply and can play a role in limiting current. By the arrangement, the reference voltage module only uses two components, and the circuit is simple in structure, stable in function, low in cost and easy to realize.
Referring to fig. 2, the control module 200 includes an analog-to-digital conversion unit 230, a calculation unit 220, and a digital-to-analog conversion unit 210;
the input end of the analog-to-digital conversion unit 230 serves as the sampling voltage input end B3 of the control module 200, the output end of the analog-to-digital conversion unit 230 is electrically connected to the input end of the calculation unit 220, the output end of the calculation unit 230 is electrically connected to the input end of the digital-to-analog conversion unit 210, and the output end of the digital-to-analog conversion unit 210 serves as the analog voltage output end B4 of the control module 200.
It should be noted that the analog-to-digital conversion unit 230, the calculation unit 220, and the digital-to-analog conversion unit 210 may be implemented by software, may also be implemented by hardware, and may be limited in practical application as needed.
With continued reference to fig. 2, analog voltage follower module 300 includes a comparison unit 310 and an emitter follower unit 320; the comparing unit 310 includes a first input terminal D1, a second input terminal D2, and an output terminal D3; the first input end D1 of the comparing unit 310 is electrically connected with the analog voltage output end B4 of the control module 200;
the emitter follower unit 320 comprises a control end E1, a power input end E2, a feedback output end E3 and a follower voltage output end E4, the control end of the emitter follower unit 320 is electrically connected with the output end of the comparison unit 310, the power input end E2 of the emitter follower unit 320 is connected with the first power signal ADD, the feedback output end E3 of the emitter follower unit 320 is electrically connected with the second input end D2 of the comparison unit 310, and the follower voltage output end E4 of the emitter follower unit 320 is electrically connected with the analog voltage output end C4 of the analog voltage follower module 300.
The following voltage output terminal E4 of the emitter following unit 320 serves as an analog voltage output terminal of the analog voltage following module 300.
In the technical solution of this embodiment, the operating principle of the comparing unit and the emitter follower unit is as follows: referring to fig. 2, the zener diode 120 outputs a reference voltage signal, the adc 230 samples the reference voltage signal output from the cathode of the zener diode 120 and converts the sampled signal from an analog signal to a digital signal to obtain a digital signal, the digital signal is input to the calculating unit 220, the digital signal is processed by the calculating unit 220 and then output to the dac 210, the dac 210 converts the digital voltage signal into an analog voltage signal and outputs the analog voltage signal to the first input end D1 of the comparing unit, the second input end D2 of the comparing unit 310 feeds back the voltage at the output end of the analog voltage follower 300, i.e., a feedback voltage signal, and compares the feedback voltage signal with the analog voltage signal input at the first input end D1, and if the analog voltage signal is greater than the feedback voltage signal, the output end D3 of the comparing unit 310 outputs a high level signal, which causes the emitter follower 320 to start to operate and release a certain amount of electric energy to increase the analog voltage and the analog voltage The second input terminal D2 of the comparing unit 310 continuously feeds back the voltage of the output terminal of the analog voltage follower module 300 and compares the voltage with the voltage of the first input terminal D1 until the voltage of the output terminal of the analog voltage follower module 300 reaches the voltage of the first input terminal D1, so that the feedback, comparison and emitter follower unit continuously releases electric energy to make the voltage of the output terminal of the analog voltage follower module 300 meet the requirement, thereby improving the output accuracy of the analog voltage.
EXAMPLE III
Fig. 3 is a schematic structural diagram of an analog voltage output circuit provided in the third embodiment of the present invention, and on the basis of the above embodiment, referring to fig. 3, the comparison unit is an operational amplifier.
Referring to fig. 3, the emitter follower unit 320 includes a transistor 321, a second resistor 322, a third resistor 323, and a fourth resistor 324, a first input end D1 of the comparison unit 310 is electrically connected to an analog voltage output end B4 of the control module 200, a second input end D2 of the comparison unit 310 is electrically connected to a first end of the second resistor 322, a second end of the second resistor 322 is electrically connected to an analog voltage output end E4 of the analog voltage follower module 300, an output end D3 of the comparison unit 310 is electrically connected to a first end of the third resistor 323, a second end of the third resistor 323 is electrically connected to a first end of the transistor 321, a second end of the transistor 321 is connected to a power input end of the analog voltage follower module 300, a second end of the transistor 321 is connected to a first power signal ADD, and a third end of the transistor 321 is electrically connected to a first end of the fourth resistor 324 and the analog voltage output end of the analog voltage follower module 300, a second terminal of the fourth resistor 324 serves as a second power terminal of the analog voltage follower module 300, and a second terminal of the fourth resistor 324 is connected to a second power signal GND.
The transistor 321 may be an NPN transistor.
In the technical solution of this embodiment, the operating principle of the analog voltage output circuit is as follows: referring to fig. 3, the zener diode 120 outputs a reference voltage signal, the a/D conversion unit 230 samples the reference voltage signal output by the cathode of the zener diode 120 and converts the sampled signal into a digital signal by performing analog signal to digital signal conversion, the digital signal is input to the calculation unit 220, the digital signal is output to the D/a conversion unit 210 after being processed by the calculation unit 220, the D/a conversion unit 210 converts the digital voltage signal into an analog voltage signal and outputs the analog voltage signal to the first input end D1 of the comparison unit, the second input end D2 of the comparison unit 310 feeds back the voltage at the output end of the analog voltage follower module 300, i.e. the feedback voltage signal, through the second resistor 322 and compares the feedback voltage signal with the analog voltage signal input by the first input end D1, if the analog voltage signal is greater than the feedback voltage signal, the output end D3 of the comparison unit 310 outputs a high level signal, this high level signal switches on triode 321, triode 321 switches on the output heavy current, release energy to the output of analog voltage following module 300, improve the voltage and the driving capability of the output of analog voltage following module 300 promptly, second input D2 of comparing unit 310 constantly feeds back the voltage of the output of analog voltage following module 300 and compares with the voltage of first input D1, until the voltage of the output of analog voltage following module 300 reaches the voltage of first input D1, can improve the output accuracy of the analog voltage of the output of analog voltage following module 300 from this. Therefore, the comparison unit 310 and the emitter follower unit 320 can enable the voltage at the output end of the analog voltage follower module 300 to meet the output requirement of the analog voltage, and the comparison unit outputs a high-level signal to control the conduction of the triode, so that the triode outputs a large current, electric energy is released, and the driving capability of the analog voltage follower module and the output precision of the analog voltage are improved.
The technical solution of this embodiment is to provide an analog voltage output circuit, which includes: the device comprises a reference voltage module, a control module and an analog voltage following module; the reference voltage module is used for providing reference voltage for the control module; the sampling voltage input end of the control module is electrically connected with the reference voltage output end of the reference voltage module, and the control module is used for generating analog voltage according to the reference voltage; the voltage input end of the analog voltage following module is electrically connected with the analog voltage output end of the control module, and the analog voltage following module is used for outputting the analog voltage output by the control module. Therefore, the analog voltage output by the control module is output through the analog voltage following module, and the output analog voltage is subjected to feedback regulation so as to meet the requirement of analog voltage output, so that the accuracy of analog voltage signal output can be improved.
Example four
Fig. 4 is a flowchart of an analog voltage calculating method provided in the fourth embodiment of the present invention, and the calculating method adopts the analog voltage output circuit according to any embodiment of the present invention.
Referring to fig. 4, the calculation method includes:
and step 410, acquiring a theoretical reference voltage input value and a theoretical reference voltage output value.
The reference voltage module may output a standard reference voltage, and the control module may obtain a theoretical reference voltage input value V1 according to the reference voltage module, and may calculate a theoretical reference voltage output value V2 according to the theoretical reference voltage input value V1.
And step 420, sampling the voltage value of the sampling voltage input end of the control module to be used as a sampling voltage value.
The control module collects the reference voltage output by the reference voltage module at a certain sampling frequency to obtain a sampling value AD 1.
And 430, determining an analog voltage value output by an analog voltage output end of the control module according to the theoretical reference voltage input value, the theoretical reference voltage output value and the sampling voltage value.
Wherein, the control module can calculate the analog voltage value DA1 output by the analog voltage output end according to the theoretical reference voltage input value V1, the theoretical reference voltage output value V2 and the sampling voltage value AD1, the analog voltage value DA1 can be calculated according to the following formula,
optionally, the reference voltage module further comprises a zener diode and a first resistor; the first end of the first resistor is electrically connected with the first power supply input end of the reference voltage module, and the second end of the first resistor is electrically connected with the cathode of the voltage stabilizing diode; and the anode of the voltage stabilizing diode is respectively and electrically connected with the second power input end of the reference voltage module and the second power input end of the control module.
Optionally, the control module includes an analog-to-digital conversion unit, a calculation unit, and a digital-to-analog conversion unit; the input end of the analog-to-digital conversion unit is electrically connected with the sampling voltage input end of the control module, the output end of the analog-to-digital conversion unit is electrically connected with the input end of the calculation unit, the output end of the calculation unit is electrically connected with the input end of the digital-to-analog conversion unit, and the output end of the digital-to-analog conversion unit is electrically connected with the analog voltage output end of the control module.
Optionally, the analog voltage following module comprises a comparing unit and an emitter following unit; the comparison unit comprises a first input end, a second input end and an output end; the first input end of the comparison unit is electrically connected with the analog voltage output end of the control module; the emitter following unit comprises a control end, a power input end, a feedback output end and a following voltage output end, the control end of the emitter following unit is electrically connected with the output end of the comparison unit, the power input end of the emitter following unit is connected with a first power signal, the feedback output end of the emitter following unit is electrically connected with the second input end of the comparison unit, and the following voltage output end of the emitter following unit is electrically connected with the analog voltage output end of the analog voltage following module.
Optionally, the emitter follower unit includes a triode, a second resistor, a third resistor and a fourth resistor, a first input terminal of the comparison unit is electrically connected to the analog voltage output terminal of the control module, a second input terminal of the comparison unit is electrically connected to a first terminal of the second resistor, a second terminal of the second resistor is electrically connected to the analog voltage output terminal of the analog voltage follower module, an output terminal of the comparison unit is electrically connected to a first terminal of the third resistor, a second terminal of the third resistor is electrically connected to a first terminal of the triode, a second terminal of the triode is electrically connected to the power input terminal, a third terminal of the triode is electrically connected to a first terminal of the fourth resistor and the analog voltage output terminal of the analog voltage follower module, and a second terminal of the fourth resistor is electrically connected to the second power terminal.
EXAMPLE five
The embodiment of the utility model provides a five still provide an analog voltage type sensor, this sensor includes the utility model discloses arbitrary embodiment analog voltage output circuit.
The analog voltage type sensor can be an analog voltage type gas pressure sensor.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (8)
1. An analog voltage output circuit, comprising: the device comprises a reference voltage module, a control module and an analog voltage following module;
the reference voltage module comprises a first power supply input end, a second power supply input end and a reference voltage output end, the first power supply input end of the reference voltage module is connected with a first power supply signal, and the second power supply input end of the reference voltage module is connected with a second power supply signal; the reference voltage module is used for providing reference voltage for the control module;
the control module comprises a first power supply input end, a second power supply input end, a sampling voltage input end and an analog voltage output end, the first power supply input end of the control module is connected with the first power supply signal, the second power supply input end of the control module is connected with the second power supply signal, and the sampling voltage input end of the control module is electrically connected with the reference voltage output end of the reference voltage module; the control module is used for generating an analog voltage according to the reference voltage;
the analog voltage following module comprises a voltage input end, a first power end, a second power end and an analog voltage output end, the voltage input end of the analog voltage following module is electrically connected with the analog voltage output end of the control module, the first power end of the analog voltage following module is connected to the first power signal, the second power end of the analog voltage following module is connected to the second power signal, and the analog voltage following module is used for outputting the analog voltage output by the control module and performing feedback regulation on the output voltage.
2. The analog voltage output circuit of claim 1, wherein the reference voltage module further comprises a zener diode and a first resistor;
a first end of the first resistor is electrically connected with a first power supply input end of the reference voltage module, and a second end of the first resistor is electrically connected with a cathode of the voltage stabilizing diode;
and the anode of the voltage stabilizing diode is respectively and electrically connected with the second power input end of the reference voltage module and the second power input end of the control module.
3. The analog voltage output circuit according to claim 1, wherein the control module includes an analog-to-digital conversion unit, a calculation unit, and a digital-to-analog conversion unit;
the input end of the analog-digital conversion unit is electrically connected with the sampling voltage input end of the control module, the output end of the analog-digital conversion unit is electrically connected with the input end of the calculation unit, the output end of the calculation unit is electrically connected with the input end of the digital-analog conversion unit, and the output end of the digital-analog conversion unit is electrically connected with the analog voltage output end of the control module.
4. The analog voltage output circuit according to claim 1, wherein the analog voltage following module comprises a comparing unit and an emitter following unit;
the comparison unit comprises a first input end, a second input end and an output end; the first input end of the comparison unit is electrically connected with the analog voltage output end of the control module;
the emitter following unit comprises a control end, a power input end, a feedback output end and a following voltage output end, the control end of the emitter following unit is electrically connected with the output end of the comparison unit, the power input end of the emitter following unit is connected with the first power signal, the feedback output end of the emitter following unit is electrically connected with the second input end of the comparison unit, and the following voltage output end of the emitter following unit is electrically connected with the analog voltage output end of the analog voltage following module.
5. The analog voltage output circuit of claim 4, wherein the comparison unit is an operational amplifier.
6. The analog voltage output circuit according to claim 4, wherein the emitter follower unit comprises a transistor, a second resistor, a third resistor and a fourth resistor, a second input terminal of the comparison unit is electrically connected to a first terminal of the second resistor, a second terminal of the second resistor is electrically connected to an analog voltage output terminal of the analog voltage follower module, an output terminal of the comparison unit is electrically connected to a first terminal of the third resistor, a second terminal of the third resistor is electrically connected to a first terminal of the transistor, a second terminal of the transistor is electrically connected to the power supply input terminal, a third terminal of the transistor is electrically connected to a first terminal of the fourth resistor and an analog voltage output terminal of the analog voltage follower module, respectively, and a second terminal of the fourth resistor is electrically connected to the second power supply terminal.
7. The analog voltage output circuit of claim 1, wherein the control module is a single chip.
8. An analog voltage type sensor comprising an analog voltage output circuit as claimed in any one of claims 1 to 7.
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