CN210954199U - Universal detection circuit for digital input signals and frequency converter - Google Patents
Universal detection circuit for digital input signals and frequency converter Download PDFInfo
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- CN210954199U CN210954199U CN201921520728.1U CN201921520728U CN210954199U CN 210954199 U CN210954199 U CN 210954199U CN 201921520728 U CN201921520728 U CN 201921520728U CN 210954199 U CN210954199 U CN 210954199U
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Abstract
The utility model discloses a general detection circuitry of digital quantity input signal and have this detection circuitry's converter, wherein, detection circuitry includes signal input part, signal output part, rectifier unit, digital quantity input unit and voltage comparison unit. Wherein the signal input terminal comprises a first input terminal and a second input terminal; the rectifying unit is connected with the first input end and the second input end; the digital quantity input unit is connected with the rectifying unit and is used for transmitting a digital quantity input signal output by the signal input end; the voltage comparison unit is connected between the digital quantity input unit and the signal output end and used for outputting a digital quantity output signal corresponding to the digital quantity input signal according to the digital quantity input signal and outputting the digital quantity output signal through the signal output end. The utility model discloses a general detection circuitry compares unit and rectifier unit through the voltage and not only can compatible detection NPN, PNP and high-speed pulse type digital signal, and whole detection circuitry cost is lower moreover.
Description
Technical Field
The utility model relates to a power electronic technology field especially relates to a general detection circuitry of digital quantity input signal and converter.
Background
As shown IN fig. 1, a digital input signal DI _ IN is connected to a primary side of an optocoupler PC1 through a resistor R1, and a high-low level of the digital input signal DI _ IN controls whether a secondary side of the optocoupler is turned on, so that an output signal DI-O generates a corresponding high-low level, and a processor detects the DI-O signal to obtain a level state of the digital input signal, thereby controlling a product. The PW is connected with the positive end or the negative end of the 24V power supply, and the digital input detection circuit shown in the figure 1 also supports NPN and PNP input modes.
As can be seen from fig. 1, although the existing digital input detection circuit has the advantages of isolating and supporting two input modes, that is, NPN and PNP, the cost of the optocoupler in the circuit is high, when a high-speed pulse signal is input, a high-cost high-speed optocoupler needs to be used, and when the system cost requirement is low, the detection circuit cannot meet the requirement.
Therefore, in order to solve the above problem, the utility model provides a can compatible NPN, PNP and high-speed pulse type digital signal's low-cost digital quantity input signal general detection circuit and have this detection circuit's converter.
SUMMERY OF THE UTILITY MODEL
The utility model provides a general detection circuitry of digital quantity input signal and have this detection circuitry's converter aims at solving the compatible higher problem of detection NPN, PNP and high-speed pulse type digital quantity signal cost that detects of current digital quantity input detection circuitry.
In order to solve the technical problem, an aspect of the present invention provides a general detection circuit for digital input signals, including: the signal input end comprises a first input end and a second input end; the rectifying unit is connected with the first input end and the second input end; the digital quantity input unit is connected with the rectifying unit and is used for transmitting the digital quantity input signal output by the signal input end; and the voltage comparison unit is connected between the digital quantity input unit and the signal output end and used for outputting a digital quantity output signal corresponding to the digital quantity input signal according to the digital quantity input signal and outputting the digital quantity output signal through the signal output end.
Further, the voltage comparing unit includes a voltage comparator.
Further, the digital input unit comprises a voltage dividing module, and the voltage dividing module is connected between the rectifying unit and the voltage comparator and is used for dividing the voltage of the digital input signal.
Further, the voltage division module comprises a first resistor, a second resistor and a third resistor; one end of the first resistor is connected with one output end of the rectifying unit, and the other end of the first resistor is connected with one end of the second resistor; one end of the third resistor is connected with the other end of the second resistor, and the other end of the third resistor is connected with the other output end of the rectifying unit.
Furthermore, the voltage division module further comprises a fourth resistor and a fifth resistor; one end of the fourth resistor is connected with a positive power supply end of the voltage comparator, and the other end of the fourth resistor is connected between the second resistor and the third resistor; one end of the fifth resistor is connected with a negative power supply end of the voltage comparator, and the other end of the fifth resistor is connected between the first resistor and the second resistor.
Furthermore, the digital quantity input unit also comprises an anti-interference module, and the anti-interference module comprises a sixth resistor and a seventh resistor; one end of the sixth resistor is connected with the non-inverting input end of the voltage comparator, and the other end of the sixth resistor is connected between the first resistor and the second resistor; one end of the seventh resistor is connected with the inverting input end of the voltage comparator, and the other end of the seventh resistor is connected between the second resistor and the third resistor.
The anti-interference unit comprises an eighth resistor and a ninth resistor; one end of the eighth resistor is connected with the first input end, and the other end of the eighth resistor is connected with one input end of the rectifying unit; one end of the ninth resistor is connected with the second input end, and the other end of the ninth resistor is connected with the other input end of the rectifying unit.
Further, the rectifying unit is a bridge rectifier circuit.
Further, the bridge rectifier circuit comprises a first diode, a second diode, a third diode and a fourth diode; the anode of the second diode is connected with the anode of the fourth diode, the cathode of the first diode is connected with the cathode of the third diode, the cathode of the second diode is connected with the anode of the first diode, and the cathode of the fourth diode is connected with the anode of the third diode.
The utility model discloses another aspect still provides a converter, the converter includes the general detection circuitry of digital quantity input signal.
The utility model discloses a general detection circuitry of digital quantity input signal and have this detection circuitry's converter, through the one-way conduction characteristic that utilizes voltage comparison unit to the sensitivity of two input end pressure differential changes and rectification unit, not only can compatible detection NPN, PNP and high-speed pulse type digital quantity signal, can avoid using the costly device of opto-coupler class moreover, whole detection circuitry cost is lower. The utility model discloses a general detection circuitry of digital input signal has solved the higher problem of compatible detection NPN, PNP and high-speed pulse type digital signal cost among the practical application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.
Fig. 1 is a circuit diagram of a digital quantity input signal detection circuit in the prior art;
fig. 2 is a schematic structural diagram of a general digital input signal detection circuit according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of a digital input unit of the digital input signal general detection circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a general digital input signal detection circuit according to another embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a general detection circuit for digital input signals according to an embodiment of the present invention; and
fig. 6 is a schematic structural diagram of a frequency converter according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Fig. 2 is a schematic structural diagram of a general detection circuit for digital input signals according to an embodiment of the present invention. Fig. 3 is a schematic block diagram of a digital quantity input unit of the digital quantity input signal general-purpose detection circuit according to an embodiment of the present invention. Fig. 4 is a schematic structural diagram of a general digital input signal detection circuit according to another embodiment of the present invention. Fig. 5 is a schematic circuit diagram of a general detection circuit for digital input signals according to an embodiment of the present invention. As shown in fig. 2 to 5, the digital input signal general detection circuit 10 of the present embodiment includes a signal input terminal 101, a rectifying unit 102, a digital input unit 103, a voltage comparing unit 104, and a signal output terminal 105. Wherein the signal input terminal 101 includes a first input terminal DI _ IN _ a and a second input terminal DI _ IN _ B; the rectifying unit 102 is connected to the first input end DI _ IN _ a and the second input end DI _ IN _ B; the digital quantity input unit 103 is connected with the rectifying unit 102 and is used for transmitting the digital quantity input signal output by the signal input end 101; the voltage comparison unit 104 is connected between the digital quantity input unit 103 and the signal output terminal 105, and is configured to output a digital quantity output signal corresponding to the digital quantity input signal according to the digital quantity input signal, and output the digital quantity output signal through the signal output terminal 105. In this embodiment, the sensitivity of the voltage comparison unit 104 to the change of the voltage difference between the two input ends and the unidirectional conduction characteristic of the rectification unit 102 are utilized, so that the digital signal of NPN, PNP and high-speed pulse type can be compatible at the same time, the digital signal detection circuit is very convenient and flexible in actual use, and high-cost devices such as an optical coupler can be avoided, so that the cost of the whole detection circuit is low.
In an embodiment, for example, in this embodiment, the voltage comparing unit 104 includes a voltage comparator U, and the digital input unit 103 includes a voltage dividing module 1031, where the voltage dividing module 1031 is connected between the rectifying unit 102 and the voltage comparator U and is used for dividing the digital input signal. Specifically, the voltage dividing module 1031 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5; one end of the first resistor R1 is connected to an output end of the rectifying unit 102, and the other end is connected to one end of the second resistor R2; one end of the third resistor R3 is connected to the other end of the second resistor R2, and the other end is connected to the other output end of the rectifying unit 102. One end of the fourth resistor R4 is connected with the positive power supply end of the voltage comparator U, and the other end is connected between the second resistor R2 and the third resistor R3; one end of the fifth resistor R5 is connected with the negative power supply end of the voltage comparator U, and the other end is connected between the first resistor R1 and the second resistor R2. In this embodiment, the first resistor R1 is equal to the third resistor R3, and the fourth resistor R4 is equal to the fifth resistor R5, so that the same effect of detecting NPN and PNP digital quantity signals can be achieved. In other embodiments, the first resistor R1 and the third resistor R3, and the fourth resistor R4 and the fifth resistor R5 may not be equal, depending on actual circuit requirements.
In an embodiment, for example, in this embodiment, the digital input unit 103 further includes an interference rejection module 1032, where the interference rejection module 1032 includes a sixth resistor R6 and a seventh resistor R7; one end of the sixth resistor R6 is connected with the non-inverting input end of the voltage comparator U, and the other end is connected between the first resistor R1 and the second resistor R2; one end of the seventh resistor R7 is connected to the inverting input terminal of the voltage comparator U, and the other end is connected between the second resistor R2 and the third resistor R3. In this embodiment, the sixth resistor R6 is equal to the seventh resistor R7, so that the same effect of detecting NPN and PNP digital quantity signals can be achieved. In other embodiments, capacitors may be connected between the sixth resistor R6 and the non-inverting input terminal of the voltage comparator U, and between the seventh resistor R7 and the inverting input terminal of the voltage comparator U, so as to form RC filtering, thereby achieving better interference immunity. The sixth resistor R6 and the seventh resistor R7 may not be equal, depending on the actual circuit requirements.
In an embodiment, for example, in the embodiment, the rectifying unit 102 is a bridge rectifying circuit. Specifically, the bridge rectification circuit includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4; the anode of the second diode D2 is connected to the anode of the fourth diode D4, the cathode of the first diode D1 is connected to the cathode of the third diode D3, the cathode of the second diode D2 is connected to the anode of the first diode D1, and the cathode of the fourth diode D4 is connected to the anode of the third diode D3. In this embodiment, the bridge rectifier circuit is composed of four diodes, and by using the unidirectional conductivity of the diodes, when the signal input terminal 101 of the digital input signal general detection circuit 10 inputs a high level signal or a low level signal, the high level signal or the low level signal is transmitted to the digital input unit 103 through the bridge rectifier circuit, and then is subjected to voltage division by the voltage division module 1031 in the digital input unit 103, and then is transmitted to the voltage comparison unit 104 for detection, and finally, a digital output signal corresponding to the digital input signal is output through the signal output terminal 105, that is, the bridge rectifier circuit can make the entire detection circuit compatible with NPN and PNP digital signals.
In an embodiment, for example, in this embodiment, the digital input signal universal detection circuit 10 of this embodiment further includes an interference rejection unit 106, where the interference rejection unit 106 includes an eighth resistor R8 and a ninth resistor R9. One end of the eighth resistor R8 is connected to the first input end DI _ IN _ a, and the other end is connected to an input end of the rectifying unit 102; one end of the ninth resistor R9 is connected to the second input terminal DI _ IN _ B, and the other end is connected to the other input terminal of the rectifying unit 102. In this embodiment, the other end of the eighth resistor R8 is connected between the cathode of the second diode D2 and the anode of the first diode D1, one end of the ninth resistor R9 is connected between the cathode of the fourth diode D4 and the anode of the third diode D3, and the eighth resistor R8 is equal to the ninth resistor R9, so that the same effect of detecting NPN and PNP digital signals can be achieved; in other embodiments, capacitors may be connected between the eighth resistor R8 and one input terminal of the rectifying unit 102, and between the ninth resistor R9 and the other input terminal of the rectifying unit 102, so as to form RC filtering, thereby achieving better interference resistance. The eighth resistor R8 and the ninth resistor R9 may not be equal, depending on the actual circuit requirements.
In an embodiment, for example, in this embodiment, the voltage comparing unit 104 further includes a tenth resistor connected to the output terminal of the voltage comparator U, and the other end of the tenth resistor is connected to the supply voltage. In this embodiment, the output terminal of the voltage comparator U is the signal output terminal 105. The signal Output terminal 105 may be connected to a subsequent stage circuit, for example, a GPIO (General Purpose Input Output) pin of a single chip microcomputer.
How the digital quantity input signal general-purpose detection circuit 10 detects the digital quantity input signal through the voltage comparator U and outputs a digital quantity output signal corresponding to the digital quantity input signal is described in detail below.
First, the voltage difference between the voltage V1 at the non-inverting input terminal and the voltage V2 at the inverting input terminal in the voltage comparator U is calculated:
wherein V is the voltage input by the signal input terminal 101 in the digital input signal general-purpose detection circuit 10.
Then, designing R9+ R1 < R4
Finally, the high-low level signal output by the signal output end 105 of the digital input signal general detection circuit 10 is judged according to the high-low level signal input by the signal input end 101 of the digital input signal general detection circuit 10. The voltage V input by the signal input terminal 101 in the digital input signal general detection circuit 10 may be 0V or 24V.
When the voltage V input by the signal input terminal 101 is 0V, the voltage difference between the voltage V1 at the non-inverting input terminal and the voltage V2 at the inverting input terminal in the voltage comparator U is:
namely, the voltage V1 at the non-inverting input terminal of the voltage comparator U is smaller than the voltage V2 at the inverting input terminal, the output terminal of the voltage comparator U outputs a low level signal, namely, the signal output terminal 105 of the digital input signal universal test circuit 10 also outputs a low level signal when the signal input terminal 101 of the digital input signal universal test circuit 10 inputs a low level signal.
When the voltage V input at the input terminal of the digital input signal universal detection circuit 10 is 24V,
namely, the voltage V1 at the non-inverting input terminal of the voltage comparator U is greater than the voltage V2 at the inverting input terminal, the output terminal of the voltage comparator U outputs a high level signal, namely, the signal output terminal 105 of the digital input signal universal test circuit 10 also outputs a high level signal when the signal input terminal 101 of the digital input signal universal test circuit 10 inputs a high level signal.
In summary, the level change output by the signal output terminal 105 in the digital input signal general detection circuit 10 reflects the level change input by the signal input terminal 101 in the digital input signal general detection circuit 10, thereby realizing digital input detection. In this embodiment, since the voltage comparator U reacts very sensitively to the voltage difference change between the two input terminals, the digital input signal universal detection circuit 10 can detect both the normal digital quantity and the high-speed pulse. In addition, the digital input signal general detection circuit 10 only uses the voltage comparator U, the resistor and the diode which are low in cost, and the cost of the whole circuit is lower than that of the traditional digital input detection circuit, and particularly has great cost advantage compared with a high-speed pulse input detection circuit.
In an embodiment, for example, the present embodiment further provides a frequency converter 1. Referring to fig. 6, fig. 6 is a schematic structural diagram of a frequency converter according to an embodiment of the present invention. The frequency converter 1 comprises the above-mentioned digital input signal general detection circuit 10.
The utility model provides a general detection circuitry of digital quantity input signal, through the one-way conduction characteristic that utilizes voltage comparison unit to the sensitivity that two input end pressure differential changes and rectification unit, not only can compatible detection NPN, PNP and high-speed pulse type digital quantity signal, can avoid using the costly device of opto-coupler class moreover, whole detection circuitry cost is lower. Specifically, the utility model discloses an utilize bridge rectifier circuit, but compatible detection NPN and PNP type digital input signal, the rethread utilizes voltage comparator to react very sensitively to the pressure differential change of two inputs, and whole general detection circuitry not only can detect ordinary digital input signal, can also detect high-speed pulse signal, and only used low-cost voltage comparator, resistance and diode because of general detection circuitry, and whole general detection circuitry cost is lower than traditional digital input detection circuitry. The utility model discloses a general detection circuitry of digital input signal has solved the higher problem of compatible detection NPN, PNP and high-speed pulse type digital signal cost among the practical application.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A universal detection circuit for digital input signals, comprising:
the signal input end comprises a first input end and a second input end;
the rectifying unit is connected with the first input end and the second input end;
the digital quantity input unit is connected with the rectifying unit and is used for transmitting the digital quantity input signal output by the signal input end; and
and the voltage comparison unit is connected between the digital quantity input unit and the signal output end and is used for outputting a digital quantity output signal corresponding to the digital quantity input signal according to the digital quantity input signal and outputting the digital quantity output signal through the signal output end.
2. The digital input signal universal detection circuit as claimed in claim 1, wherein the voltage comparison unit comprises a voltage comparator.
3. The universal digital input signal detection circuit as claimed in claim 2, wherein the digital input unit comprises a voltage dividing module, and the voltage dividing module is connected between the rectifying unit and the voltage comparator for dividing the digital input signal.
4. The digital quantity input signal universal detection circuit according to claim 3, wherein the voltage division module comprises a first resistor, a second resistor and a third resistor; one end of the first resistor is connected with one output end of the rectifying unit, and the other end of the first resistor is connected with one end of the second resistor; one end of the third resistor is connected with the other end of the second resistor, and the other end of the third resistor is connected with the other output end of the rectifying unit.
5. The universal digital input signal detection circuit as claimed in claim 4, wherein said voltage divider module further comprises a fourth resistor and a fifth resistor; one end of the fourth resistor is connected with a positive power supply end of the voltage comparator, and the other end of the fourth resistor is connected between the second resistor and the third resistor; one end of the fifth resistor is connected with a negative power supply end of the voltage comparator, and the other end of the fifth resistor is connected between the first resistor and the second resistor.
6. The universal digital input signal detection circuit as claimed in claim 4, wherein said digital input unit further comprises a tamper resistant module, said tamper resistant module comprising a sixth resistor and a seventh resistor; one end of the sixth resistor is connected with the non-inverting input end of the voltage comparator, and the other end of the sixth resistor is connected between the first resistor and the second resistor; one end of the seventh resistor is connected with the inverting input end of the voltage comparator, and the other end of the seventh resistor is connected between the second resistor and the third resistor.
7. The universal digital input signal detection circuit as claimed in claim 1, further comprising a tamper unit, said tamper unit comprising an eighth resistor and a ninth resistor; one end of the eighth resistor is connected with the first input end, and the other end of the eighth resistor is connected with one input end of the rectifying unit; one end of the ninth resistor is connected with the second input end, and the other end of the ninth resistor is connected with the other input end of the rectifying unit.
8. The digital input signal universal detection circuit as claimed in claim 1, wherein the rectifying unit is a bridge rectifier circuit.
9. The digital quantity input signal universal detection circuit according to claim 8, wherein the bridge rectifier circuit comprises a first diode, a second diode, a third diode and a fourth diode; the anode of the second diode is connected with the anode of the fourth diode, the cathode of the first diode is connected with the cathode of the third diode, the cathode of the second diode is connected with the anode of the first diode, and the cathode of the fourth diode is connected with the anode of the third diode.
10. A frequency converter, characterized in that the frequency converter comprises: the digital quantity input signal universal detection circuit as claimed in any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921520728.1U CN210954199U (en) | 2019-09-09 | 2019-09-09 | Universal detection circuit for digital input signals and frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921520728.1U CN210954199U (en) | 2019-09-09 | 2019-09-09 | Universal detection circuit for digital input signals and frequency converter |
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| CN210954199U true CN210954199U (en) | 2020-07-07 |
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| CN201921520728.1U Active CN210954199U (en) | 2019-09-09 | 2019-09-09 | Universal detection circuit for digital input signals and frequency converter |
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