CN101710826A - Output waveform shaping circuit of mechanical switch control circuit - Google Patents
Output waveform shaping circuit of mechanical switch control circuit Download PDFInfo
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- CN101710826A CN101710826A CN200910189694A CN200910189694A CN101710826A CN 101710826 A CN101710826 A CN 101710826A CN 200910189694 A CN200910189694 A CN 200910189694A CN 200910189694 A CN200910189694 A CN 200910189694A CN 101710826 A CN101710826 A CN 101710826A
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Abstract
The invention is suitable for the technical field of control circuit, providing an output waveform shaping circuit of a mechanical switch control circuit. The circuit comprises two mechanical switch control circuits sharing one mechanical switch and also comprises a waveform shaping circuit, wherein the input end of the waveform shaping circuit is connected with the output ends of the mechanical switch control circuits, and the waveform shaping circuit is used for eliminating high-frequency burr produced by the mechanical switch and shapes the voltage waveform output by the mechanical switch control circuits into square waves. In the invention, the output ends of the mechanical switch control circuits are connected with the waveform shaping circuit to eliminate high-frequency noise produced by the mechanical switch and shape voltage waveform output by the mechanical switch control circuits into square waves, thus ensuring that a next-stage control circuit gives correct judgement to output a correct result.
Description
Technical field
The invention belongs to the technical field of control circuit, relate in particular to a kind of output waveform shaping circuit of circuit of mechanical switch control.
Background technology
Fig. 1 shows the structure of existing mechanical ON-OFF control circuit, it comprises first resistance R 1 and mechanical switch S1, the first termination 5V power supply of first resistance R 1, first end of second termination machinery switch S 1 of first resistance R 1, the contact of second end of first resistance R 1 and first end of mechanical switch S1 is the output of circuit of mechanical switch control, the second end ground connection of mechanical switch S1, in the fast high frequency control circuit, when mechanical switch S1 connects, because vibration can make the phenomenon of output voltage V 0 waveform generation high frequency burr, Fig. 2 shows the output waveform structure of circuit of mechanical switch control, in electronic circuit, be not allow to occur this phenomenon, especially in high frequency control circuit, it is one group of high-frequency impulse that this high frequency burr can be used as, and obscures logical circuit, this will cause back level control circuit to do the judgement that makes mistake, the result of output error.
Summary of the invention
The object of the present invention is to provide a kind of output waveform shaping circuit of circuit of mechanical switch control, there is the problem that produces the high frequency burr in the output waveform that is intended to solve the existing mechanical ON-OFF control circuit.
The present invention is achieved in that a kind of output waveform shaping circuit of circuit of mechanical switch control, and described circuit comprises two circuit of mechanical switch control of a shared mechanical switch, and described circuit also comprises:
The waveform shaping circuit that input is connected with the output of described two circuit of mechanical switch control respectively is used to eliminate the high frequency burr that described mechanical switch produces, and the voltage waveform that described two circuit of mechanical switch control are exported is shaped to square wave.
In the said structure, described two circuit of mechanical switch control are first circuit of mechanical switch control and second circuit of mechanical switch control, described first circuit of mechanical switch control comprises first resistance, first termination power of described first resistance, first end of the second termination mechanical switch of described first resistance, the contact of second end of described first resistance and first end of mechanical switch is the output of first circuit of mechanical switch control.
In the said structure, described second circuit of mechanical switch control comprises second resistance, first termination power of described second resistance, second end of the second termination mechanical switch of described second resistance, the contact of second end of described second resistance and second end of mechanical switch is the output of second circuit of mechanical switch control.
In the said structure, described waveform shaping circuit is a rest-set flip-flop.
In the said structure, described rest-set flip-flop comprises first NAND gate and second NAND gate, the first input end of described first NAND gate connects the output of first circuit of mechanical switch control, the output of described second NAND gate of the second input termination of described first NAND gate, the first input end of described second NAND gate connects the output of second circuit of mechanical switch control, the output of described first NAND gate of the second input termination of described second NAND gate.
In the present invention, connect waveform shaping circuit by the output at circuit of mechanical switch control, eliminate the high frequency burr that mechanical switch produces, the voltage waveform that circuit of mechanical switch control is exported is shaped to square wave, a level control circuit is made right judgement after guaranteeing, exports correct result.
Description of drawings
Fig. 1 is the structure chart of existing mechanical ON-OFF control circuit;
Fig. 2 is the output waveform structure chart of existing mechanical ON-OFF control circuit;
Fig. 3 is the structure chart of the output waveform shaping circuit of the circuit of mechanical switch control that provides of the embodiment of the invention;
Fig. 4 is the output waveform structure chart of the output waveform shaping circuit of the circuit of mechanical switch control that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
As shown in Figure 3, the output waveform shaping circuit of circuit of mechanical switch control comprises two circuit of mechanical switch control of a shared mechanical switch, circuit also comprises waveform shaping circuit 100, the input of waveform shaping circuit 100 is connected with the output of two circuit of mechanical switch control respectively, be used to eliminate the high frequency burr that mechanical switch produces, the voltage waveform that two circuit of mechanical switch control are exported is shaped to square wave.
Fig. 3 shows the structure of the output waveform shaping circuit of the circuit of mechanical switch control that the embodiment of the invention provides, and for convenience of explanation, only shows part related to the present invention.
The output waveform shaping circuit of circuit of mechanical switch control comprises first circuit of mechanical switch control and second circuit of mechanical switch control of a shared mechanical switch S1, mechanical switch S1 is a single-pole double-throw switch (SPDT), because so just can avoid the output of first circuit of mechanical switch control and the output of second circuit of mechanical switch control low level situation to occur being simultaneously, first circuit of mechanical switch control comprises first resistance R 1, the first termination 5V power supply of first resistance R 1, first end of second termination machinery switch S 1 of first resistance R 1, second circuit of mechanical switch control comprises second resistance R 2, the first termination 5V power supply of second resistance R 2, second end of second termination machinery switch S 1 of second resistance R 2, the 3rd end ground connection of mechanical switch S1, wherein, the contact of second end of first resistance R 1 and first end of mechanical switch S1 is the output of first circuit of mechanical switch control, and the contact of second end of second resistance R 2 and second end of mechanical switch S1 is the output of second circuit of mechanical switch control.
The output waveform shaping circuit of circuit of mechanical switch control also comprises waveform shaping circuit 100, the input of waveform shaping circuit 100 is connected with the output of first circuit of mechanical switch control with second circuit of mechanical switch control respectively, eliminate the high frequency burr that mechanical switch S1 produces, the voltage waveform of first circuit of mechanical switch control and the output of second circuit of mechanical switch control is shaped to square wave.
As one embodiment of the invention, waveform shaping circuit 100 is a rest-set flip-flop, rest-set flip-flop comprises the first NAND gate U1A and the second NAND gate U1B, the first input end of the first NAND gate U1A connects the output of first circuit of mechanical switch control, the output of the second input termination, the second NAND gate U1B of the first NAND gate U1A, the first input end of the second NAND gate U1B connects the output of second circuit of mechanical switch control, the output of the second input termination, the first NAND gate U1A of the second NAND gate U1B.
Fig. 4 shows the output waveform structure of the output waveform shaping circuit of the circuit of mechanical switch control that the embodiment of the invention provides.
The operation principle of the output waveform shaping circuit of circuit of mechanical switch control is:
1, at first, establish mechanical switch S1 and originally be connected with the B point, the output of first circuit of mechanical switch control is a high level, and the output of second circuit of mechanical switch control is a low level, at this moment the output Q=0 of the first NAND gate U1A of rest-set flip-flop.
2, when mechanical switch S1 dials to A by B, in this process of stirring, it is unsettled that one of short duration period is arranged, the output of the output of first circuit of mechanical switch control and second circuit of mechanical switch control is high level, so because the memory function of rest-set flip-flop, the output Q=0 of the first NAND gate U1A of rest-set flip-flop.
3, when mechanical switch S1 contacts with the A point, the A point produces vibration owing to mechanical switch S1 connects and produces " burr ".But, because the output of second circuit of mechanical switch control has been a high level, in a single day low level appears in the output of first circuit of mechanical switch control, the state of the output of the first NAND gate U1A of rest-set flip-flop upset rapidly is Q=1, even high level appears in the output of first circuit of mechanical switch control once more, rest-set flip-flop is in the state of keeping, and also can't change the output state of rest-set flip-flop again, so the voltage of Q end " burr " can not occur, is constant high level.
4, opposite, be connected with the A point as mechanical switch S1 at first, its operation principle and upset mode so repeat no more too here.
In embodiments of the present invention, connect waveform shaping circuit by output at circuit of mechanical switch control, eliminate the high frequency burr that mechanical switch produces, the voltage waveform of circuit of mechanical switch control output is shaped to square wave, a level control circuit is made right judgement after guaranteeing, exports correct result.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. the output waveform shaping circuit of a circuit of mechanical switch control, described circuit comprises two circuit of mechanical switch control of a shared mechanical switch, it is characterized in that, the output waveform shaping circuit of described circuit of mechanical switch control also comprises:
The waveform shaping circuit that input is connected with the output of described two circuit of mechanical switch control respectively is used to eliminate the high frequency burr that described mechanical switch produces, and the voltage waveform that described two circuit of mechanical switch control are exported is shaped to square wave.
2. the output waveform shaping circuit of circuit of mechanical switch control as claimed in claim 1, it is characterized in that, described two circuit of mechanical switch control are first circuit of mechanical switch control and second circuit of mechanical switch control, described first circuit of mechanical switch control comprises first resistance, first termination power of described first resistance, first end of the second termination mechanical switch of described first resistance, the contact of second end of described first resistance and first end of mechanical switch is the output of first circuit of mechanical switch control.
3. the output waveform shaping circuit of circuit of mechanical switch control as claimed in claim 2, it is characterized in that, described second circuit of mechanical switch control comprises second resistance, first termination power of described second resistance, second end of the second termination mechanical switch of described second resistance, the contact of second end of described second resistance and second end of mechanical switch is the output of second circuit of mechanical switch control.
4. the output waveform shaping circuit of circuit of mechanical switch control as claimed in claim 3 is characterized in that, described waveform shaping circuit is a rest-set flip-flop.
5. the output waveform shaping circuit of circuit of mechanical switch control as claimed in claim 4, it is characterized in that, described rest-set flip-flop comprises first NAND gate and second NAND gate, the first input end of described first NAND gate connects the output of first circuit of mechanical switch control, the output of described second NAND gate of the second input termination of described first NAND gate, the first input end of described second NAND gate connects the output of second circuit of mechanical switch control, the output of described first NAND gate of the second input termination of described second NAND gate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910189694A CN101710826A (en) | 2009-08-31 | 2009-08-31 | Output waveform shaping circuit of mechanical switch control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910189694A CN101710826A (en) | 2009-08-31 | 2009-08-31 | Output waveform shaping circuit of mechanical switch control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN101710826A true CN101710826A (en) | 2010-05-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910189694A Pending CN101710826A (en) | 2009-08-31 | 2009-08-31 | Output waveform shaping circuit of mechanical switch control circuit |
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|---|---|
| CN (1) | CN101710826A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103064315A (en) * | 2012-12-19 | 2013-04-24 | 唐榕珠 | Switch circuit capable of removing mechanical shaking |
-
2009
- 2009-08-31 CN CN200910189694A patent/CN101710826A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103064315A (en) * | 2012-12-19 | 2013-04-24 | 唐榕珠 | Switch circuit capable of removing mechanical shaking |
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Application publication date: 20100519 |