CN108768354B - Three-potential double-limit comparison circuit - Google Patents
Three-potential double-limit comparison circuit Download PDFInfo
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- CN108768354B CN108768354B CN201810803234.8A CN201810803234A CN108768354B CN 108768354 B CN108768354 B CN 108768354B CN 201810803234 A CN201810803234 A CN 201810803234A CN 108768354 B CN108768354 B CN 108768354B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/002—Switching arrangements with several input- or output terminals
- H03K17/007—Switching arrangements with several input- or output terminals with several outputs only
Abstract
The invention discloses a three-potential double-limit comparison circuit, which comprises: the first voltage stabilizing sub-circuit is used for outputting a first voltage stabilizing voltage; the second voltage stabilizing sub-circuit is used for outputting a second voltage stabilizing voltage; the fourth switch is connected with the output end of the second voltage stabilizing sub-circuit, and the second input end and the third input end are grounded; the first voltage comparator is used for inputting a voltage input signal through the in-phase input end, inputting a third direct-current voltage through the reverse-phase input end, and connecting the output end with the first controlled end; and the non-inverting input end of the second voltage comparator is used for inputting a voltage input signal, the inverting input end of the second voltage comparator is used for inputting a fourth direct-current voltage, and the output end of the second voltage comparator is connected with the second controlled end. The three-potential double-limit comparison circuit has higher output stability and precision.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a three-potential double-limit comparison circuit.
Background
In automatic production process control and daily life equipment, comparison and judgment are often required to be carried out on the state of a control object so as to control the action of an executing mechanism. For example, when the liquid level of the liquid in the tank body is controlled, when the liquid level exceeds the set liquid level, the control actuating mechanism opens the liquid outlet to enable the liquid to be discharged out of the tank body; when the liquid level is lower than the set liquid level, the actuating mechanism is controlled to open the liquid injection port to enable the liquid to be injected into the box body; when the liquid level is between the two, the actuating mechanism is controlled to close the liquid outlet and the liquid injection port. Thus, in the above automatic control process, 3 potentials are required to represent 3 states in which the liquid level is located, respectively.
The existing three-potential double-limit comparison circuit is mostly realized by an operational amplifier, a resistor and a diode network, and the main principle is that the three-potential double-limit comparison is realized by utilizing the on-off switching characteristic of a diode through the on-off or the on-off switching characteristic of a voltage selection diode. However, since the diode is conducted and has threshold voltage and is cut off and has leakage current, the output of the existing three-potential double-limit comparison circuit is unstable, and the precision of the three-potential double-limit comparison circuit is reduced.
Disclosure of Invention
Aiming at the problems, the three-potential double-limit comparison circuit can effectively have higher output stability and precision.
In order to solve the above technical problems, a three-potential double-limit comparison circuit of the present invention includes:
the first voltage stabilizing sub-circuit is provided with an input end and an output end, wherein the input end of the first voltage stabilizing sub-circuit is used for inputting a first direct current voltage, and the output end of the first voltage stabilizing sub-circuit is used for outputting the first voltage stabilizing voltage;
the second voltage stabilizing sub-circuit is provided with an input end and an output end, wherein the input end of the second voltage stabilizing sub-circuit is used for inputting a second direct current voltage, and the output end of the second voltage stabilizing sub-circuit is used for outputting a second voltage stabilizing voltage;
the fourth switch is provided with a first input end, a second input end, a third input end, a fourth input end, a first controlled end, a second controlled end and an output end, wherein the first input end is connected with the output end of the first voltage stabilizing sub-circuit, the fourth input end is connected with the output end of the second voltage stabilizing sub-circuit, the second input end and the third input end are grounded, and the output end of the fourth switch is the output end of the three-potential double-limit comparison circuit;
the first voltage comparator is used for inputting a voltage input signal through a non-inverting input end, inputting a third direct-current voltage through an inverting input end, and connecting an output end with a first controlled end of the one-out-of-four switch;
and the non-inverting input end of the second voltage comparator is used for inputting the voltage input signal, the inverting input end of the second voltage comparator is used for inputting the fourth direct-current voltage, and the output end of the second voltage comparator is connected with the second controlled end of the one-out-of-four switch.
Compared with the prior art, the three-potential double-limit comparison circuit provided by the invention has the advantages that the first voltage comparator and the second voltage comparator are adopted to compare with the voltage input signal, and the first voltage stabilizing voltage output by the first voltage stabilizing sub-circuit or the second voltage stabilizing voltage output by the second voltage stabilizing sub-circuit or the output 0 is controlled by the four-selection switch according to the comparison result, so that the stability of the output of the three-potential double-limit comparison circuit can be effectively improved, the precision of the three-potential double-limit comparison circuit is further improved, and the problems of poor stability and low precision caused by the fact that the three-potential double-limit comparison is realized by using the on or off of the traditional diode are avoided.
As an improvement of the above solution, the first voltage stabilizing sub-circuit includes: a first resistor and a first zener diode; wherein, the liquid crystal display device comprises a liquid crystal display device,
one end of the first resistor is used as an input end of the first voltage stabilizing sub-circuit and is used for inputting the first direct-current voltage, and the other end of the first resistor is respectively connected with the cathode of the first voltage stabilizing diode and the first input end of the one-out-of-four switch;
the anode of the first zener diode is grounded.
As an improvement of the above solution, the second voltage stabilizing sub-circuit includes: a second resistor and a second zener diode; wherein, the liquid crystal display device comprises a liquid crystal display device,
one end of the second resistor is used as an input end of the second voltage stabilizing sub-circuit and is used for inputting the second direct-current voltage, and the other end of the second resistor is respectively connected with the anode of the second voltage stabilizing diode and the fourth input end of the one-out-of-four switch;
and the anode of the second zener diode is grounded.
As an improvement of the above scheme, the voltage value of the first dc voltage is equal to the voltage value of the second dc voltage, the polarity of the first dc voltage is positive, and the polarity of the second dc voltage is negative.
As an improvement of the above-described aspect, the voltage value of the third direct-current voltage is larger than the voltage value of the fourth direct-current voltage.
As an improvement of the scheme, the four-way switch adopts a high-precision four-way switch with the precision of +/-0.1 percent.
Drawings
Fig. 1 is a schematic diagram of a three-potential double-limit comparison circuit according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram showing the transmission characteristics of the three-potential double-limit comparison circuit in embodiment 1 of the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly practiced by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
The technical scheme of the present invention is clearly and completely described below with reference to specific embodiments and drawings.
Example 1
As shown in fig. 1, a schematic diagram of a three-potential double-limit comparison circuit according to embodiment 1 of the present invention is shown.
The three-potential double-limit comparison circuit comprises: the first voltage stabilizing sub-circuit 1 has an input end and an output end, the input end of the first voltage stabilizing sub-circuit 1 is used for inputting a first direct current voltage +E, and the output end U of the first voltage stabilizing sub-circuit 1 1 For outputting a first regulated voltage V 1 The method comprises the steps of carrying out a first treatment on the surface of the A second voltage stabilizing sub-circuit 2 having an input terminal and an output terminal, the input terminal of the second voltage stabilizing sub-circuit 2 being used for inputting a second DC voltage, the output terminal U of the second voltage stabilizing sub-circuit 2 2 For outputting a second regulated voltage V 2 The method comprises the steps of carrying out a first treatment on the surface of the A four-way switch 3 having a first input terminal Y 1 A second input terminal Y 2 A third input terminal Y 3 Fourth input terminal Y 4 A first controlled end C, a second controlled end D and an output end U o A first input terminal Y 1 And the output end U of the first voltage stabilizing sub-circuit 1 1 Connected to the fourth input terminal Y 4 And the output end U of the second voltage stabilizing sub-circuit 2 2 Connected with a second input terminal Y 2 And a third input terminal Y 3 Grounded, output end U o The output end of the three-potential double-limit comparison circuit; first voltage comparator A 1 The non-inverting input terminal is used for inputting a voltage input signal U i An inverting input terminal for inputting a third DC voltage E 2 Output end U O1 The first controlled end C of the one-out-of-four switch 3 is connected; second voltage comparator A 2 The non-inverting input terminal is used for inputting a voltage input signal U i An inverting input terminal for inputting a fourth DC voltage E 1 Output end U O2 And the second controlled terminal D of the one-out-of-four switch 3 is connected.
Specifically, the first voltage stabilizing sub-circuit 1 includes: first resistor R 1 And a first zener diode D 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein the first resistor R 1 Is used as an input end of the first voltage stabilizing sub-circuit 1 for inputting a first direct current voltage +E, a first resistor R 1 The other end of (a) is respectively connected with the first voltage stabilizing diode D 1 A cathode of (2) and a first input terminal Y of a one-out-of-four switch 3 1 Connecting; first zener diode D 1 Is grounded.
Specifically, the second voltage stabilizing sub-circuit 2 includes: second resistor R 2 And a second zener diode D 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein the second resistor R 2 Is used as the input end of the second voltage stabilizing sub-circuit 1 for inputting the second DC voltage-E, the second resistor R 2 Respectively with the other end of the second zener diode D 2 A cathode of (2) and a fourth input Y of the one-out-of-four switch 3 4 Connecting; second zener diode D 1 Is grounded.
Next, the operation of the three-potential double-limit comparison circuit of the present invention will be described with reference to fig. 1 and 2.
In the present invention, the voltage input signal U i At the same time input to the first voltage comparator A 1 And a second voltage comparator A 2 Is the non-inverting input terminal of (a), voltage output signal U out Output terminal U of one-out-of-four switch 3 O And outputting.
When U is i <E 1 At the time, the first voltage comparator A 1 Output terminal U of (2) O1 A first controlled terminal C for outputting low level to the one-out-of-four switch 3, a second voltage comparator A 2 Output terminal U of (2) O2 A second controlled terminal D for outputting low level to the one-out-of-four switch 3, a fourth input terminal Y for the one-out-of-four switch 3 4 And output end U o On, i.e. Y 4 —U o The output end U of the switch o Output voltage output signal U out Is U (U) out ＝V 2 。
When E is 1 ≤U i ≤E 2 At the time, the first voltage comparator A 1 Output terminal U of (2) O1 A first controlled terminal C for outputting low level to the one-out-of-four switch 3, a second voltage comparator A 2 Output terminal U of (2) O2 Output ofThe second controlled terminal D of the high level to the one-out-of-four switch 3, the second input terminal Y of the one-out-of-four switch 3 2 And output end U o On, i.e. Y 2 —U o The output end U of the switch o Output voltage output signal U out Is U (U) out =0; alternatively, the third input Y of the one-out-of-four switch 3 3 And output end U o On, i.e. Y 3 —U o Output end U of one-out-of-four switch o Output voltage output signal U out Is U (U) out ＝0。
When U is i >E 2 At the time, the first voltage comparator A 1 Output terminal U of (2) O1 A first controlled terminal C for outputting high level to the one-out-of-four switch 3, a second voltage comparator A 2 Output terminal U of (2) O2 Outputs high level to the second controlled end D of the one-out-of-four switch 3, and the first input end Y of the one-out-of-four switch 3 1 And output end U o On, i.e. Y 1 —U o The output end U of the switch o Output voltage output signal U out Is U (U) out ＝V 1 。
In summary, in the three-potential double-limit comparison circuit of the present invention, when the voltage is input to the signal U i Satisfy E 1 ≤U i ≤E 2 When in use, the output end U of the three-potential double-limit comparison circuit o The output signal is U out =0; when the voltage is input into the signal U i Meet U i <E 1 When in use, the output end U of the three-potential double-limit comparison circuit o The output signal is U out ＝V 2 The method comprises the steps of carrying out a first treatment on the surface of the When the voltage is input into the signal U i Meet U i >E 2 When in use, the output end U of the three-potential double-limit comparison circuit o The output signal is U out ＝V 1 . That is, the three-potential double-limit comparison circuit of the invention passes through the output end U o Output V of (2) 2 、V 1 And 0 three potential to represent the voltage input signal U i At the same time, due to the output terminal U o Output signal U of (2) out In section [ V 2 ，V 1 ]In, i.e. within double limits, realizeThree-potential double-limit comparison function.
Optionally, the voltage value of the first direct current voltage +E is equal to the voltage value of the second direct current voltage-E, the polarity of the first direct current voltage +E is positive, and the polarity of the second direct current voltage-E is negative.
Optionally, a third DC voltage E 2 The voltage value of (2) is larger than the fourth DC voltage E 1 Is a voltage value of (a). In the three-potential double-limit comparison circuit of the invention, the third direct-current voltage E 2 And a fourth DC voltage E 1 Co-determining voltage input signal U i The position of the 3 different voltage intervals of (a) can be adjusted by adjusting the third DC voltage E 2 And a fourth DC voltage E 1 To change the position of 3 different voltage intervals of the voltage input signal.
Preferably, when a voltage input signal U is employed i To represent the controlled object, a third DC voltage E 2 And a fourth DC voltage E 1 The 3 states in which the controlled object is located can be determined together.
Preferably, the one-out-of-four switch 3 employs a high-precision one-out-of-four switch with a precision of ±0.1%.
Compared with the prior art, the three-potential double-limit comparison circuit has the following beneficial effects:
(1) The first voltage comparator and the second voltage comparator are adopted to compare with the voltage input signal to determine the voltage interval where the voltage input signal is located, and the four-way switch is controlled to gate the first voltage stabilizing sub-circuit to output the first voltage stabilizing voltage or gate the second voltage stabilizing sub-circuit to output the second voltage stabilizing voltage or output 0 according to the comparison result, so that the stability of the output of the three-potential double-limit comparison circuit can be effectively improved, the precision of the three-potential double-limit comparison circuit is further improved, and the problems of poor stability and low precision caused by the fact that the three-potential double-limit comparison is realized by using the on or off of a traditional diode are avoided;
(2) The voltage stabilizing diode is adopted in the voltage stabilizing sub-circuit, so that the output of the three-potential double-limit comparison circuit is quite stable, and the anti-interference performance of the circuit can be improved;
(3) The three-potential double-limit comparison circuit can improve the precision of the output signal of the circuit by selecting the precision of the first zener diode, the second zener diode and the one-out-of-four switch;
(4) The designed three-potential double-limit comparison circuit adopts basic electronic components, so that the circuit structure of the three-potential double-limit comparison circuit is simplified, and the manufacturing cost is reduced.
The present invention is not limited to the preferred embodiments, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present invention will still fall within the scope of the technical solution of the present invention.
Claims (6)
1. A three-potential double-limit comparison circuit, comprising:
the first voltage stabilizing sub-circuit is provided with an input end and an output end, wherein the input end of the first voltage stabilizing sub-circuit is used for inputting a first direct current voltage, and the output end of the first voltage stabilizing sub-circuit is used for outputting the first voltage stabilizing voltage;
the second voltage stabilizing sub-circuit is provided with an input end and an output end, wherein the input end of the second voltage stabilizing sub-circuit is used for inputting a second direct current voltage, and the output end of the second voltage stabilizing sub-circuit is used for outputting a second voltage stabilizing voltage;
the fourth switch is provided with a first input end, a second input end, a third input end, a fourth input end, a first controlled end, a second controlled end and an output end, wherein the first input end is connected with the output end of the first voltage stabilizing sub-circuit, the fourth input end is connected with the output end of the second voltage stabilizing sub-circuit, the second input end and the third input end are grounded, and the output end of the fourth switch is the output end of the three-potential double-limit comparison circuit;
the first voltage comparator is used for inputting a voltage input signal through a non-inverting input end, inputting a third direct-current voltage through an inverting input end, and connecting an output end with a first controlled end of the one-out-of-four switch;
the non-inverting input end of the second voltage comparator is used for inputting the voltage input signal, the inverting input end of the second voltage comparator is used for inputting a fourth direct-current voltage, and the output end of the second voltage comparator is connected with the second controlled end of the one-out-of-four switch;
when the voltage input signal is smaller than the fourth direct-current voltage, the output end of the first voltage comparator outputs low level to the first controlled end of the one-out-of-four switch, the output end of the second voltage comparator outputs low level to the second controlled end of the one-out-of-four switch, and the fourth input end of the one-out-of-four switch is connected with the output end.
2. The three-potential double-limit comparison circuit according to claim 1, wherein the first voltage stabilizing sub-circuit includes: a first resistor and a first zener diode; wherein, the liquid crystal display device comprises a liquid crystal display device,
one end of the first resistor is used as an input end of the first voltage stabilizing sub-circuit and is used for inputting the first direct-current voltage, and the other end of the first resistor is respectively connected with the cathode of the first voltage stabilizing diode and the first input end of the one-out-of-four switch;
the anode of the first zener diode is grounded.
3. The three-potential double-limit comparison circuit according to claim 1, wherein the second voltage stabilizing sub-circuit includes: a second resistor and a second zener diode; wherein, the liquid crystal display device comprises a liquid crystal display device,
one end of the second resistor is used as an input end of the second voltage stabilizing sub-circuit and is used for inputting the second direct-current voltage, and the other end of the second resistor is respectively connected with the anode of the second voltage stabilizing diode and the fourth input end of the one-out-of-four switch;
and the anode of the second zener diode is grounded.
4. The three-potential double-limit comparison circuit according to claim 1, wherein the voltage value of the first direct-current voltage is equal to the voltage value of the second direct-current voltage, the polarity of the first direct-current voltage is positive, and the polarity of the second direct-current voltage is negative.
5. The three-potential double-limit comparison circuit according to claim 1, wherein a voltage value of the third direct-current voltage is larger than a voltage value of the fourth direct-current voltage.
6. The three-potential double-limit comparison circuit according to claim 1, wherein the one-out-of-four switch is a high-precision one-out-of-four switch with a precision of ±0.1%.
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| CN201810803234.8A CN108768354B (en) | 2018-07-20 | 2018-07-20 | Three-potential double-limit comparison circuit |
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