CN216873187U - Universal input interface circuit and control circuit - Google Patents
Universal input interface circuit and control circuit Download PDFInfo
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- CN216873187U CN216873187U CN202220510758.XU CN202220510758U CN216873187U CN 216873187 U CN216873187 U CN 216873187U CN 202220510758 U CN202220510758 U CN 202220510758U CN 216873187 U CN216873187 U CN 216873187U
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Abstract
The utility model provides a universal input interface circuit and a control circuit, the interface circuit comprising: the circuit comprises a first diode, a second diode, a first triode and a first resistor; the cathode of the first diode is connected with a signal input end when in use, and the anode of the first diode is connected with the base electrode of the first triode; the cathode of the second diode is connected with a signal input end when in use, the anode of the second diode is connected with the collector of the first triode, and the emitter of the first triode is grounded; the first end of the first resistor is connected with the collector of the first triode, and the second end of the first resistor is connected with the power output end; the problem of prior art high low level input signal collection incompatible is solved, realize the unified collection of high level and low level input voltage, improved interface circuit's accommodation to circuit structure is simple, with low costs and reliable and stable.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to a universal input interface circuit and a control circuit.
Background
Because there is no unified input standard in the switch input signals of the whole vehicle system, for example, some input signals are high level valid, and some input signals are low level valid, the two different level input signals need different hardware circuits to acquire, so as to judge whether there is signal input currently.
Therefore, the problem that the high-low level input signal acquisition is incompatible exists in the prior art, the input signals of different levels are acquired through different hardware circuits, the production cost of the circuit is increased, and the adaptability is not strong.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the universal input interface circuit and the control circuit provided by the utility model solve the problem that the high-low level input signal acquisition is incompatible in the prior art, realize the uniform acquisition of high-level and low-level input voltage, improve the application range of the interface circuit, and have the advantages of simple circuit structure, low cost, stability and reliability.
In a first aspect, the present invention provides a universal input interface circuit, comprising: the circuit comprises a first diode, a second diode, a first triode and a first resistor; the cathode of the first diode is connected with a signal input end when in use, and the anode of the first diode is connected with the base electrode of the first triode; the cathode of the second diode is connected with a signal input end when in use, the anode of the second diode is connected with the collector of the first triode, and the emitter of the first triode is grounded; the first end of the first resistor is connected with the collector of the first triode, and the second end of the first resistor is connected with the power output end; the collector of the first triode is the output end of the universal input interface circuit.
Optionally, the interface circuit further comprises: a second resistor and a third resistor; the first end of the second resistor is connected with the signal input end, and the second end of the second resistor is connected with the cathode of the first diode; and the first end of the third resistor is connected with the anode of the second diode, and the second end of the third resistor is the output end of the universal input interface circuit.
Optionally, the interface circuit further comprises: and the first end of the first capacitor is connected with the base electrode of the first triode, and the second end of the first capacitor is connected with the emitting electrode of the first triode.
Optionally, the interface circuit further comprises: and the input end of the signal detection module is connected with the voltage input end when in use and is used for detecting the input state of the current level voltage.
Optionally, the signal detection module includes: a second triode and a third triode; the base electrode of the second triode is connected with the voltage input end when in use, the collector electrode of the second triode is connected with the base electrode of the third triode, the collector electrode of the third triode is connected with the power output end, and the emitter electrode of the second triode and the emitter electrode of the third triode are respectively grounded; and the collector of the third triode is the output end of the signal detection module.
Optionally, the signal detection module further includes: a fourth resistor and a fifth resistor; the first end of the fourth resistor is connected with the collector of the second triode, the first end of the fifth resistor is connected with the collector of the third triode, and the second end of the fourth resistor and the second end of the fifth resistor are respectively connected with the output end of the power supply.
Optionally, the signal detection module further includes: and the first end of the sixth resistor is connected with the voltage input end when in use, and the second end of the sixth resistor is connected with the base electrode of the second triode.
Optionally, the signal detection module further includes: and a first end of the seventh resistor is connected with a collector of the third triode, and the seventh resistor is an output end of the signal detection module.
Optionally, the signal detection module further includes: and the first end of the second capacitor is connected with the base electrode of the second triode, and the second end of the second capacitor is connected with the emitting electrode of the second triode.
In a second aspect, the present invention provides a control circuit, which includes the universal input interface circuit.
Compared with the prior art, the utility model has the following beneficial effects:
this embodiment can both unify the output low level signal when signal input end inputs high level or low level through the general input interface circuit who comprises first diode, second diode and first triode, has solved high low level input signal compatibility problem to realize the unified collection of high level and low level input voltage, improved interface circuit's accommodation, and circuit structure is simple, with low costs and reliable and stable.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a circuit diagram of a general input interface circuit according to an embodiment of the present invention;
fig. 2 is a circuit schematic diagram of a signal detection module according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Like numbered functional units in the examples of the present invention have the same and similar structure and function.
Example one
Fig. 1 is a circuit schematic diagram of a universal input interface circuit according to an embodiment of the present invention, and as shown in fig. 1, the universal input interface circuit according to the embodiment specifically includes:
the circuit comprises a first diode D1, a second diode D2, a first triode Q1 and a first resistor R1;
the cathode of the first diode D1 is connected with a signal input end when in use, and the anode of the first diode D1 is connected with the base of the first triode Q1;
the cathode of the second diode D2 is connected with a signal input end when in use, the anode of the second diode D2 is connected with the collector of the first triode Q1, and the emitter of the first triode Q1 is grounded;
a first end of the first resistor R1 is connected to a collector of the first transistor Q1, and a second end of the first resistor R1 is connected to a power supply output end;
the collector of the first triode Q1 is the output terminal of the universal input interface circuit.
In this embodiment, when no signal is input to the signal input terminal, the first transistor Q1 is turned off, so that the output terminal of the general input interface circuit outputs a high level VCC; when a high-level signal is input into the signal input end, the second diode D2 is cut off, and the first diode D1 and the first triode Q1 are conducted, so that the output end of the general input interface circuit outputs a low-level GND; when a low-level signal is input to the signal input end, the second diode D2 is turned on, and the first diode D1 and the first triode Q1 are turned off, so that the output end of the universal input interface circuit outputs a low level of 0.3V + GND.
In this embodiment, the first resistor R1 is a pull-up resistor, and the first diode D1 is a zener diode for adjusting the threshold value of the high level active; the second diode D2 is a schottky diode for clamping low to below 0.3V.
Compared with the prior art, the utility model has the following beneficial effects:
this embodiment can both unify the output low level signal when signal input end inputs high level or low level through the general input interface circuit who comprises first diode, second diode and first triode, has solved high low level input signal compatibility problem to realize the unified collection of high level and low level input voltage, improved interface circuit's accommodation, and circuit structure is simple, with low costs and reliable and stable.
In this embodiment, the interface circuit further includes: a second resistor R2 and a third resistor R3; a first terminal of the second resistor R2 is connected to the signal input terminal, and a second terminal of the second resistor R2 is connected to the cathode of the first diode; a first end of the third resistor R3 is connected to an anode of the second diode, and a second end of the third resistor R3 is an output end of the gpio circuit.
In this embodiment, the interface circuit further includes: a first capacitor C1, wherein a first terminal of the first capacitor C1 is connected to the base of the first transistor, and a second terminal of the first capacitor C1 is connected to the emitter of the first transistor.
It should be noted that the second resistor R2 is an input current-limiting resistor, the third resistor R3 is an output current-limiting resistor, and the first capacitor C1 is an input filter capacitor, so as to filter input jitter; the first triode is an NPN triode.
Example two
In this embodiment, the interface circuit further includes: and the input end of the signal detection module is connected with the voltage input end when in use and is used for detecting the input state of the current level voltage.
Fig. 2 is a schematic circuit diagram of a signal detection module according to an embodiment of the present invention; as shown in fig. 2, the signal detection module provided in this embodiment includes:
a second transistor Q2 and a third transistor Q3; the base electrode of the second triode Q2 is connected with the voltage input end when in use, the collector electrode of the second triode Q2 is connected with the base electrode of the third triode Q3, the collector electrode of the third triode Q3 is connected with the power output end, and the emitter electrode of the second triode Q2 and the emitter electrode of the third triode Q3 are respectively grounded; the collector of the third transistor Q3 is the output terminal of the signal detection module.
In this embodiment, the signal detection module further includes: a fourth resistor R4 and a fifth resistor R5; the first end of the fourth resistor R4 is connected to the collector of the second transistor Q2, the first end of the fifth resistor R5 is connected to the collector of the third transistor Q3, and the second end of the fourth resistor R4 and the second end of the fifth resistor R5 are connected to the power output end, respectively.
In this embodiment, the signal detection module further includes: a sixth resistor R6, a first end of the sixth resistor R6 is connected to the voltage input terminal when in use, and a second end of the sixth resistor R6 is connected to the base of the second transistor Q2.
In this embodiment, the signal detection module further includes: a seventh resistor R7, wherein a first end of the seventh resistor R7 is connected to a collector of the third transistor Q3, and the seventh resistor R7 is an output end of the signal detection module.
In this embodiment, the signal detection module further includes: a second capacitor C2, wherein a first terminal of the second capacitor C2 is connected to the base of the second transistor Q2, and a second terminal of the second capacitor C2 is connected to the emitter of the second transistor Q2.
It should be noted that, in this embodiment, when the Input has no signal, the Output is at the low level GND; when the Input signal voltage >0.7V, the Output is high VCC.
It should be further explained that, because the level voltage of the entire vehicle system is generally 12V or 24V and is in a wide voltage range (8-16V, 18-36V), generally, two sets of different hardware circuits are required to collect input signals of the two different power domains, and only the circuits can be changed, which cannot be adapted universally, thereby increasing development and production costs.
In this embodiment, the signal detection module can realize any voltage collection with the voltage input end outputting voltage higher than 0.7V, solve the input signal compatibility problem of 12V and 24V systems, and realize input signal collection of any level voltage. The device has the advantages of strong universality, small element quantity, stability, reliability and low BOM cost.
In this embodiment, the sixth resistor R6 is an input current limiting resistor, and the seventh resistor R7 is an output current limiting resistor; the fourth resistor R4 and the fifth resistor R5 are pull-up resistors; the second capacitor C2 is an input filter capacitor for filtering input signal jitter.
In another embodiment of the present invention, the present invention provides a control circuit, which includes the universal input interface circuit described in the first embodiment or the second embodiment.
It is noted that, in this document, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A universal input interface circuit, said interface circuit comprising:
the circuit comprises a first diode, a second diode, a first triode and a first resistor;
the cathode of the first diode is connected with a signal input end when in use, and the anode of the first diode is connected with the base electrode of the first triode;
the cathode of the second diode is connected with a signal input end when in use, the anode of the second diode is connected with the collector of the first triode, and the emitter of the first triode is grounded;
the first end of the first resistor is connected with the collector of the first triode, and the second end of the first resistor is connected with the power output end;
the collector of the first triode is the output end of the universal input interface circuit.
2. The universal input interface circuit as recited in claim 1, wherein said interface circuit further comprises:
a second resistor and a third resistor;
the first end of the second resistor is connected with the signal input end, and the second end of the second resistor is connected with the cathode of the first diode;
and the first end of the third resistor is connected with the anode of the second diode, and the second end of the third resistor is the output end of the universal input interface circuit.
3. The universal input interface circuit as recited in claim 2, wherein said interface circuit further comprises:
and the first end of the first capacitor is connected with the base electrode of the first triode, and the second end of the first capacitor is connected with the emitting electrode of the first triode.
4. A universal input interface circuit as recited in any of claims 1-3, wherein said interface circuit further comprises:
and the input end of the signal detection module is connected with the voltage input end when in use and is used for detecting the input state of the current level voltage.
5. The universal input interface circuit as recited in claim 4, wherein said signal detection module comprises:
a second triode and a third triode;
the base electrode of the second triode is connected with the voltage input end when in use, the collector electrode of the second triode is connected with the base electrode of the third triode, the collector electrode of the third triode is connected with the power output end, and the emitter electrode of the second triode and the emitter electrode of the third triode are respectively grounded;
and the collector of the third triode is the output end of the signal detection module.
6. The universal input interface circuit as recited in claim 5, wherein said signal detection module further comprises:
a fourth resistor and a fifth resistor;
the first end of the fourth resistor is connected with the collector of the second triode, the first end of the fifth resistor is connected with the collector of the third triode, and the second end of the fourth resistor and the second end of the fifth resistor are respectively connected with the output end of the power supply.
7. The universal input interface circuit as recited in claim 6, wherein said signal detection module further comprises:
and the first end of the sixth resistor is connected with the voltage input end when in use, and the second end of the sixth resistor is connected with the base electrode of the second triode.
8. The universal input interface circuit as recited in claim 7, wherein said signal detection module further comprises:
and a first end of the seventh resistor is connected with a collector of the third triode, and the seventh resistor is an output end of the signal detection module.
9. The universal input interface circuit as recited in claim 8, wherein said signal detection module further comprises:
and the first end of the second capacitor is connected with the base electrode of the second triode, and the second end of the second capacitor is connected with the emitting electrode of the second triode.
10. A control circuit, characterized in that the control circuit comprises a universal input interface circuit as claimed in any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220510758.XU CN216873187U (en) | 2022-03-09 | 2022-03-09 | Universal input interface circuit and control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220510758.XU CN216873187U (en) | 2022-03-09 | 2022-03-09 | Universal input interface circuit and control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216873187U true CN216873187U (en) | 2022-07-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220510758.XU Active CN216873187U (en) | 2022-03-09 | 2022-03-09 | Universal input interface circuit and control circuit |
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| Country | Link |
|---|---|
| CN (1) | CN216873187U (en) |
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- 2022-03-09 CN CN202220510758.XU patent/CN216873187U/en active Active
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