CN205005035U - Can realize that high level arrives low level conversion's output interface circuit - Google Patents
Can realize that high level arrives low level conversion's output interface circuit Download PDFInfo
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- CN205005035U CN205005035U CN201520632272.3U CN201520632272U CN205005035U CN 205005035 U CN205005035 U CN 205005035U CN 201520632272 U CN201520632272 U CN 201520632272U CN 205005035 U CN205005035 U CN 205005035U
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Abstract
The utility model discloses a can realize that high level arrives low level conversion's output interface circuit, interface circuit is to there being input interface circuit in output, input interface circuit has input mains voltage end, output interface circuit include, export power supply voltage end, and its magnitude of voltage is greater than the magnitude of voltage of input mains voltage end, an operational amplifier, an operational amplifier's inverting input end through first resistance with export power supply voltage end links to each other, an operational amplifier's inverting input end still links to each other with the ground end through second resistance, an operational amplifier's non inverting input end through third resistance with export power supply voltage end links to each other, and, first diode, its negative sense end with an operational amplifier's output links to each other, the forward of first diode end for with the input interface circuit link to each other. The utility model discloses circuit structure is simple, and the commonality is strong, the terminal control equipment of adaptable difference.
Description
Technical field
The utility model relates to interface circuit, particularly relates to a kind ofly to realize the output interface circuit of high level to low transition.
Background technology
Arrange output interface circuit in product, arrange input interface circuit in terminal control device, wherein, output interface circuit and input interface circuit support the use.During use, product, by the high or low level signal of output interface circuit output logic, is supplied to terminal control device by input interface circuit.But because terminal control device is different, and input interface circuit adopts different supply voltages, need thus to design different product, make the incoming level requirement meeting various terminal control device.Be not difficult to find out, this can cause causing product category to increase, and mutually can not be general, also can circuit for generating fault by mistake.The cost of product is also a problem with management in addition.In view of above-mentioned, urgently design a kind of novel output interface circuit.
Utility model content
The purpose of this utility model is to overcome product category in prior art and increases and mutual uncurrent problem, provides a kind of novel realized high level to the output interface circuit of low transition.
In order to realize this purpose, the technical solution of the utility model is as follows: a kind ofly realize the output interface circuit of high level to low transition, described output interface circuit is to having input interface circuit, described input interface circuit has input supply voltage end, it is characterized in that, described output interface circuit includes
Output supply voltage end, its magnitude of voltage is greater than the magnitude of voltage of described input supply voltage end;
First operational amplifier, it has in-phase input end, inverting input and output, the inverting input of described first operational amplifier is connected with described output supply voltage end by the first resistance, the inverting input of described first operational amplifier is also connected with ground end by the second resistance, the in-phase input end of described first operational amplifier is connected with described output supply voltage end by the 3rd resistance, and the in-phase input end of described first operational amplifier is also connected with ground end by the first electric capacity; And,
First diode, it has forward end and negative end, and the negative end of described first diode is connected with the output of described first operational amplifier, and the forward end of described first diode is in order to be connected with described input interface circuit;
The resistance of described first resistance is greater than the resistance of described second resistance, and the resistance of described second resistance equals the resistance of described 3rd resistance.
The preferred version of high level to the interface circuit of low transition is realized, the resistance 200k Europe of described first resistance, the resistance 100k Europe of described second resistance, the resistance 100k Europe of described 3rd resistance, capacitance 1 μ of described first electric capacity as a kind of.
Realize the preferred version of high level to the interface circuit of low transition as a kind of, described first operational amplifier is LM324, and described first diode is 1N4001.
Compared with prior art, the utility model has the advantage of: circuit structure is simple, and highly versatile, can adapt to different terminal control devices.
Accompanying drawing explanation
Fig. 1 is the use structural representation of the utility model one embodiment.
Fig. 2 is the electrical block diagram of the utility model one embodiment.
Embodiment
By reference to the accompanying drawings the utility model is described in further detail below by concrete execution mode.
Refer to Fig. 1 and 2, shown in figure is a kind ofly realize the output interface circuit of high level to low transition, described output interface circuit 1(product) to there being input interface circuit 2(terminal control device).Described input interface circuit has input supply voltage end.
Described output interface circuit forms primarily of output supply voltage end, the first operational amplifier and the first diode.
The magnitude of voltage VH of described output supply voltage end is greater than the magnitude of voltage VL of described input supply voltage end.
Described first operational amplifier has in-phase input end, inverting input and output.The inverting input of described first operational amplifier is connected with described output supply voltage end by the first resistance R1, the inverting input of described first operational amplifier is also connected with ground end by the second resistance R2, the in-phase input end of described first operational amplifier is connected with described output supply voltage end by the 3rd resistance R3, and the in-phase input end of described first operational amplifier is also connected with ground end by the first electric capacity.
Described first diode Z2 has forward end and negative end.The negative end of described first diode Z2 is connected with the output of described first operational amplifier, and the forward end of described first diode Z2 is in order to be connected with described input interface circuit.
In the present embodiment, the resistance 200k Europe of described first resistance R1, the resistance 100k Europe of described second resistance R2, the resistance 100k Europe of described 3rd resistance R3, capacitance 1 μ of described first electric capacity C8.Described first operational amplifier is LM324, and described first diode is 1N4001.
When described first operational amplifier output logic low level, due to the design of described first diode, described first diode current flow, described input interface circuit is pulled down to low level by described first diode, thus, described terminal control device obtains input low level input signal.
When described first operational amplifier output logic high level, magnitude of voltage due to described first diode and described output supply voltage end is greater than the design of the magnitude of voltage of described input supply voltage end, the anti-phase cut-off of described first diode, described input interface circuit is equivalent to open circuit input, open circuit input can think that high level inputs usually, being converted to by pull-up resistor is high level input, and thus, described terminal control device obtains input high level input signal.
Can clearly be seen that, described output interface circuit can adapt to the terminal control device of different input supply voltage.
Below only have expressed execution mode of the present utility model, it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (3)
1. can realize the output interface circuit of high level to low transition, described output interface circuit is to having input interface circuit, and described input interface circuit has input supply voltage end, it is characterized in that, described output interface circuit includes,
Output supply voltage end, its magnitude of voltage is greater than the magnitude of voltage of described input supply voltage end;
First operational amplifier, it has in-phase input end, inverting input and output, the inverting input of described first operational amplifier is connected with described output supply voltage end by the first resistance, the inverting input of described first operational amplifier is also connected with ground end by the second resistance, the in-phase input end of described first operational amplifier is connected with described output supply voltage end by the 3rd resistance, and the in-phase input end of described first operational amplifier is also connected with ground end by the first electric capacity; And,
First diode, it has forward end and negative end, and the negative end of described first diode is connected with the output of described first operational amplifier, and the forward end of described first diode is in order to be connected with described input interface circuit;
The resistance of described first resistance is greater than the resistance of described second resistance, and the resistance of described second resistance equals the resistance of described 3rd resistance.
2. according to claim 1ly a kind ofly realize the output interface circuit of high level to low transition, it is characterized in that, the resistance 200k Europe of described first resistance, the resistance 100k Europe of described second resistance, the resistance 100k Europe of described 3rd resistance, capacitance 1 μ of described first electric capacity.
3. according to claim 1 and 2ly a kind ofly realize the output interface circuit of high level to low transition, it is characterized in that, described first operational amplifier is LM324, and described first diode is 1N4001.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520632272.3U CN205005035U (en) | 2015-08-21 | 2015-08-21 | Can realize that high level arrives low level conversion's output interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520632272.3U CN205005035U (en) | 2015-08-21 | 2015-08-21 | Can realize that high level arrives low level conversion's output interface circuit |
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| Publication Number | Publication Date |
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| CN205005035U true CN205005035U (en) | 2016-01-27 |
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| CN201520632272.3U Active CN205005035U (en) | 2015-08-21 | 2015-08-21 | Can realize that high level arrives low level conversion's output interface circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114326542A (en) * | 2022-01-18 | 2022-04-12 | 杭州晶华微电子股份有限公司 | Signal generating circuit for industrial hybrid control |
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2015
- 2015-08-21 CN CN201520632272.3U patent/CN205005035U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114326542A (en) * | 2022-01-18 | 2022-04-12 | 杭州晶华微电子股份有限公司 | Signal generating circuit for industrial hybrid control |
| CN114326542B (en) * | 2022-01-18 | 2023-12-05 | 杭州晶华微电子股份有限公司 | Industrial mixed control signal generation circuit |
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