CN110716135A - Effective capturing circuit and capturing method for impact type mechanical switch signal - Google Patents
Effective capturing circuit and capturing method for impact type mechanical switch signal Download PDFInfo
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- CN110716135A CN110716135A CN201911029153.8A CN201911029153A CN110716135A CN 110716135 A CN110716135 A CN 110716135A CN 201911029153 A CN201911029153 A CN 201911029153A CN 110716135 A CN110716135 A CN 110716135A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
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- Engineering & Computer Science (AREA)
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- Electronic Switches (AREA)
Abstract
The invention relates to an effective capturing circuit and a capturing method of an impact type mechanical switch signal, which comprises a programmable processor, a power supply voltage capable of supplying power to the programmable processor, a mechanical switch and a conversion circuit, wherein the mechanical switch is connected with the programmable processor through the power supply voltage; the switching circuit converts a closing signal of the mechanical switch into a pulse signal as an input signal of the programmable processor, the programmable processor detects the validity of the input signal and controls the output of the rear stage. The invention can accurately capture the effective signal of the mechanical switch, eliminate the interference signal and prevent the false triggering; the circuit has simple structure, small volume, easy realization and low cost.
Description
Technical Field
The invention belongs to the technical field of electronic circuits, and particularly relates to an effective capturing method of an impact type mechanical switch signal.
Background
Impact type mechanical switch obtains sending wide the application because of simple structure, convenient to use in electronic circuit, but mechanical switch can produce the maloperation because of self mechanical structure's characteristics in the use, and then brings serious consequence, especially uses in the circuit in the aspect of triggering fuze etc. and needs the closed effective signal of effectual catching mechanical switch, and the influence of eliminating interfering signal, otherwise can cause the false triggering, and then detonate the explosive, harm seriously.
Disclosure of Invention
In order to solve the problems, an effective capturing method of an impact type mechanical switch signal is designed, which can effectively capture a closed effective signal of the mechanical switch signal, eliminate an interference signal and accurately control the rear-stage output.
The technical solution for realizing the purpose of the invention is as follows:
an effective capture circuit of impact type mechanical switch signals comprises a power supply voltage, a programmable processor, a mechanical switch and a conversion circuit;
a supply voltage that can power the programmable processor;
the switching circuit converts a closing signal of the mechanical switch into a pulse signal as an input signal of the programmable processor, the programmable processor detects the validity of the input signal and controls the output of the rear stage.
Further, the conversion circuit includes a resistor and a capacitor;
one end of the resistor and one end of the capacitor are connected with one end of the mechanical switch in common to a signal input end of the programmable processor, the other end of the capacitor is grounded with the other end of the mechanical switch, and the other end of the resistor is connected with power supply voltage.
Further, an impact closing simulation test is carried out on the mechanical switch, and an oscilloscope is adopted to monitor an output signal of the mechanical switch; when the mechanical switch is disconnected, the input signal of the programmable processor is at a high level; when the mechanical switch is closed, the input signal of the programmable processor is at low level, and the time for which the input signal of the programmable processor lasts at low level is measured by the oscilloscope.
Furthermore, when the mechanical switch is turned off, the input end of the programmable processor is connected with the power supply voltage and is at a high level, and when the mechanical switch is turned on, the input end of the programmable processor is connected with the ground and is at a low level, and a falling edge is generated when the high level is converted into the low level.
Further, the programmable processor adopts an external interrupt mode to judge whether the input signal has a falling edge.
A method for effectively capturing impact type mechanical switch signals includes converting closing signals of a mechanical switch into pulse signals by a conversion circuit to be used as input signals of a programmable processor, detecting the input signals by the programmable processor, judging whether falling edges of the input signals occur or not by adopting an external interruption mode, entering an interruption program if the falling edges occur, judging whether the closing signals of the mechanical switch are effective signals or not through time delay, controlling rear-stage output if the closing signals of the mechanical switch are effective signals, judging the closing signals to be invalid signals (namely interference signals) if the closing signals are not the effective signals, returning to a main program, continuously waiting for next external interruption and circulating the same until the effective signals occur.
Furthermore, when the mechanical switch is turned off, the input end of the programmable processor is connected with the power supply voltage and is at a high level, and when the mechanical switch is turned on, the input end of the programmable processor is connected with the ground and is at a low level, and a falling edge is generated when the high level is converted into the low level.
Further, performing an impact closing simulation test on the mechanical switch, and monitoring an output signal of the mechanical switch by using an oscilloscope; when the mechanical switch is disconnected, the input signal of the programmable processor is at a high level; when the mechanical switch is closed, the input signal of the programmable processor is at low level, and the time of the input signal of the programmable processor lasting at low level is measured by the oscilloscope.
Further, the time of the delay is that the mechanical switch is active for a low level time.
Each impact type mechanical switch has different closing characteristics, the switching circuit is utilized to carry out a switch impact closing simulation test, and the oscilloscope monitors the output signal of the switch, so that the closing characteristics of the mechanical switch can be displayed as the time of the pulse signal lasting low level. And on the basis of sufficient experiments, obtaining the time distribution of the continuous low level when the switch is closed, and taking a proper continuous low level time value on the basis of less than the minimum time to judge the time value as an effective signal of the mechanical switch.
The programmable processor is a singlechip processor.
The invention has the advantages that:
1. the closing signal of the mechanical switch is converted into a pulse signal, the effective signal of the mechanical switch is accurately captured by utilizing the accurate timing of the single chip microcomputer, the interference signal is eliminated, and the false triggering is prevented.
2. Simple structure, small volume, easy realization and low cost.
Drawings
Fig. 1 is a schematic block diagram of an efficient capture circuit for a slam-strike mechanical switch signal of the present invention.
Fig. 2 is a conversion circuit diagram of an effective capture circuit of a slam-type mechanical switch signal according to the present invention.
Fig. 3 is a circuit diagram of the programmable processor of the present invention connected to a mechanical switch.
Fig. 4 is a flow chart of an effective capturing method of the impact type mechanical switch signal according to the invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the circuit for effectively capturing signals of an impact type mechanical switch of the invention comprises a power supply voltage, a programmable processor, a mechanical switch, a conversion circuit and the like.
As shown in fig. 2, the conversion circuit includes a resistor R and a capacitor C; one end of the resistor R and one end of the capacitor C are connected with the output end together with one end of the mechanical switch K, the other end of the capacitor C and the other end of the mechanical switch K are grounded GND, the other end of the resistor R is connected with 3.3V power voltage, and the switching circuit mainly converts a closing signal of the mechanical switch K into a pulse signal OUT1 through circuit design to serve as an input signal of the programmable processor. When the switch impact closing simulation test is carried out, the oscilloscope monitors the output signal of the mechanical switch, and when the mechanical switch is opened, the input signal of the programmable processor is at a high level; when the mechanical switch is closed, the input signal of the programmable processor is changed into low level, each impact experiment generates a pulse signal, and the oscilloscope measures the time of the low level of the input signal of the programmable processor.
As shown in fig. 3, the programmable processor is a single chip microcomputer PIC, and receives a pulse signal transmitted by the mechanical switch K, and the single chip microcomputer judges whether a falling edge occurs in an input signal by adopting an external interrupt mode. When the mechanical switch K is switched off, the input end of the single chip microcomputer is connected with the power supply voltage 3.3V and is in a high level, when the mechanical switch K is switched on, the input end of the single chip microcomputer is grounded, namely GND (ground) is in a low level, and a falling edge is generated when the high level is converted into the low level. When the input end of the single chip microcomputer detects a falling edge, an interruption program is entered, a mechanical switch effective signal is delayed for a low level time, then an input signal is detected, if the input signal is at a low level, the input signal is judged to be a mechanical switch K effective signal, the subsequent stage output is controlled, if the input signal is not at a low level, the input signal is judged to be an invalid signal (namely an interference signal), the main program is returned, the next falling edge is continuously waited for, the cycle is carried out, until an effective signal appears, and the judgment process is shown in fig. 4.
Claims (9)
1. An effective capture circuit of impact type mechanical switch signals is characterized by comprising a programmable processor, a power supply voltage capable of supplying power to the programmable processor, a mechanical switch and a conversion circuit;
the switching circuit converts a closing signal of the mechanical switch into a pulse signal as an input signal of the programmable processor, the programmable processor detects the validity of the input signal and controls the output of the rear stage.
2. The circuit of claim 1, wherein the switching circuit comprises a resistor and a capacitor;
one end of the resistor and one end of the capacitor are connected with one end of the mechanical switch in common to a signal input end of the programmable processor, the other end of the capacitor is grounded with the other end of the mechanical switch, and the other end of the resistor is connected with power supply voltage.
3. The circuit for effectively capturing signals of an impact type mechanical switch according to claim 2, wherein the mechanical switch output signals are monitored by an oscilloscope through an impact closing simulation test on the mechanical switch; when the mechanical switch is disconnected, the input signal of the programmable processor is at a high level; when the mechanical switch is closed, the input signal of the programmable processor is at low level, and the time for which the input signal of the programmable processor lasts at low level is measured by the oscilloscope.
4. The circuit of claim 2, wherein the programmable processor input is connected to the power supply voltage at a high level when the mechanical switch is turned off, and is connected to the ground at a low level when the mechanical switch is turned off, and the falling edge is generated when the mechanical switch is turned from the high level to the low level.
5. The circuit of claim 2 or 4, wherein the programmable processor determines whether the input signal has a falling edge by means of an external interrupt.
6. A method for effectively capturing impact type mechanical switch signals is characterized in that a conversion circuit converts closing signals of a mechanical switch into pulse signals serving as input signals of a programmable processor, the programmable processor detects the input signals, whether falling edges of the input signals occur or not is judged in an external interruption mode, if the falling edges occur, an interruption program is started, a set time is delayed to judge whether the closing signals of the mechanical switch are effective signals or not, if the falling edges occur, the subsequent stage output is controlled, and if the falling edges do not occur, the next external interruption is returned to continue to wait until the effective signals occur, so that the cycle is carried out until the effective signals occur.
7. The method as claimed in claim 6, wherein the programmable processor input is connected to the power voltage at a high level when the mechanical switch is turned off, and is connected to a low level when the mechanical switch is turned off, and a falling edge is generated when the mechanical switch is turned from the high level to the low level.
8. The method of claim 6, wherein the delay is set to a time when the input signal of the programmable processor measured in the impact closure simulation test of the mechanical switch lasts for a low time.
9. The method for effectively capturing signals of an impact type mechanical switch according to claim 8, wherein the step of performing the impact closing simulation test on the mechanical switch comprises: monitoring an output signal of the mechanical switch by using an oscilloscope; when the mechanical switch is disconnected, the input signal of the programmable processor is at a high level; when the mechanical switch is closed, the input signal of the programmable processor is at low level, and the time of the input signal of the programmable processor lasting at low level is measured by the oscilloscope.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911029153.8A CN110716135A (en) | 2019-10-28 | 2019-10-28 | Effective capturing circuit and capturing method for impact type mechanical switch signal |
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| CN201911029153.8A CN110716135A (en) | 2019-10-28 | 2019-10-28 | Effective capturing circuit and capturing method for impact type mechanical switch signal |
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| CN110716135A true CN110716135A (en) | 2020-01-21 |
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| CN109766014A (en) * | 2018-12-28 | 2019-05-17 | 惠州市蓝微电子有限公司 | A kind of single-chip microcontroller key range is by the method for hitting operation |
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Application publication date: 20200121 |