CN106598896A - Pulse amplitude limiting conversion circuit - Google Patents
Pulse amplitude limiting conversion circuit Download PDFInfo
- Publication number
- CN106598896A CN106598896A CN201611085898.2A CN201611085898A CN106598896A CN 106598896 A CN106598896 A CN 106598896A CN 201611085898 A CN201611085898 A CN 201611085898A CN 106598896 A CN106598896 A CN 106598896A
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- Prior art keywords
- pulse
- power supply
- signal
- pulse voltage
- voltage signal
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/382—Information transfer, e.g. on bus using universal interface adapter
- G06F13/385—Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017509—Interface arrangements
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/38—Universal adapter
- G06F2213/3852—Converter between protocols
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Computing Systems (AREA)
- Mathematical Physics (AREA)
- Manipulation Of Pulses (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
The invention discloses a pulse amplitude limiting conversion circuit and aims at providing a pulse amplitude limiting conversion circuit in which a duty ratio is invariable and an output signal is performed with amplitude limiting. The pulse amplitude limiting conversion circuit disclosed by the invention is realized by the following technical scheme: an output end of a power supply chip is connected with a grounding parallel circuit of the power supply chip through a resistor R1, when an input end of the power supply chip inputs a pulse voltage signal with a DC voltage Vi of 7-20V, the output end is electrically connected with an I/O input port of a singlechip, the output end is processed by the grounding parallel circuit to obtain a pulse voltage signal with a high level of 5+/-0.25V and a low-level pulse voltage signal Vo not greater than 0.5V, the high-level pulse voltage signal and the low-level pulse voltage signal are identified by the singlechip CPU and are converted into corresponding digital signals ''1'' and ''0'', namely the amplitudes of the pulse voltage signals are limited within the necessary ranges. By adoption of the pulse amplitude limiting conversion circuit disclosed by the invention, the problem that the external interference pulses of a diode amplitude limiting circuit plunge into the circuit to cause abnormal increase of the signal at certain moment to lead to voltage fluctuation in the prior art is solved.
Description
Technical field
The present invention relates to a kind of central processor CPU signal processing circuit interface being mainly used in computer detection system
Pulse limitation signal process change-over circuit.
Background technology
The front end units of computer detection system are sensors, and input direct voltage is usually 7～20V, it is output as 5 ±
The DC voltage of 0.25V.In the cpu system that power supply is+5V, it is often necessary to by the signal transacting of remote super+5V into the+5V systems
Receptible signal.The interface of the central processor CPU in the signal exported due to sensor and computer detection system is not simultaneous
Hold, easily cause the reason for signal amplitude increase extremely, amplitude exception increase to be diversified, such as accidental factor, such as
The fluctuation of supply voltage causes signal amplitude many in certain moment increase, and it is also to draw that extraneous significantly disturbing pulse scurries into circuit
Play the common cause of signal condition of instant error increase.Therefore need to carry out signal transacting with conversion.The larger discrete magnitude letter of amplitude
Number need to give CPU after amplitude limit, conventional method is turned using diode limiting circuit, triode amplitude limiter circuit or optocoupler
Change, the most basic working condition of diode is to turn on and end two kinds, and using this characteristic amplitude limiter circuit is may be constructed.So-called limit
Width, is exactly limited in the amplitude of signal within the scope of required.So-called amplitude limiter circuit, just refers to certain point in limiting circuit
Signal amplitude size, when signal amplitude it is big to a certain extent when, do not allow the amplitude of signal to increase again；When the amplitude of signal does not have
When reaching the amplitude of restriction, amplitude limiter circuit does not work.Circuit with this function is referred to as amplitude limiter circuit, has utilized a diode for
Circuit into amplitude limit this function is referred to as diode limiting circuit.The circuit of amplitude limit is wanted mostly to be high-frequency electrical pulses due to commonly required
Road, high frequency carrier circuit, high frequency signal amplifying circuit, high frequency modulated circuit etc., therefore it is more steep to require that limiter diode has
U-I characteristics, be allowed to good switch performance.From this starting point, limiter diode generally individually switchs two poles by junction type
Pipe 2CK* takes on;In the circuit of some particular/special requirements, the detector diode 2AG* or switching diode 2AK* for putting contact also may be used
To complete amplitude limit task as limiter diode;More also need higher magnitude amplitude limit or not only needed amplitude limit but also needed temperature certainly
The particular electrical circuit of dynamic compensation, Zener diode will become unique correct selection as limiter diode.Because diode is string
Between input, output, therefore it is called series connection amplitude limiter circuit.If diode has preferable switching characteristic, then, when ui is less than
During E, D is not turned on, uO=E;After ui is higher than E, D conductings, uO=ui.When input amplitude is more than the sine wave of E, output voltage
Waveform, the lower level of output signal is limited in a certain fixed value E, so this limiter is called lower limiter.Such as will
Diode polarity is exchanged, then obtain for output signal boundary level being limited to a certain upper limiter numerically.By diode and
Load is in parallel, then constitute shunt limiter, is also a upper limiter.Upper and lower limiter is combined, it is possible to constitute
Double limiting circuit.Amplitude limiter circuit is that, by the circuit that signal voltage wave amplitude is scabbled in the scope for limiting, amplitude limiter circuit is usually used in：①
Shaping, the interference of output waveform of such as pruning top or bottom；2. waveform conversion, such as prunes the positive pulse in output signal, only
Leave negative pulse therein;3. overvoltage protection, when such as strong output signal or interference is possible to damage certain part, can be at this
Amplitude limiter circuit is accessed before part.Due to the presence of diode, input signal can be had an impact;Because even voltage is not above limit
Width scope, the equivalent resistance of diode also in parallel with sampling impedance can change the defeated people's impedance of sampling, make measured signal decay, to adopting
The precision of sample produces impact.Trend of purchasing flex point is not precipitous, and signal is also affected in clipping range.Signal internal resistance is in signal output
When have pressure drop, when obtaining electric current and being input into, the voltage of electric capacity can increase, and then raise whole system supply voltage, whole system
The components and parts of system are all applied in the high voltage allowed more than work, and components and parts will be destroyed.Therefore, amplitude limiter circuit is in actual work
A/D sampling channels can not be protected when going wrong in work.
The content of the invention
The purpose of the present invention is the signal and computer detection system central processing unit for prior art sensor output
Cpu i/f is incompatible, easily causes the problem of signal amplitude increase extremely, there is provided a kind of dutycycle is constant, the signal quilt of output
The pulse amplitude limit change-over circuit of amplitude limit.
The above-mentioned purpose of the present invention can be reached by following measures, a kind of pulse amplitude limit change-over circuit, including：As
The power supply chip that voltage-stabilized power supply is used, it is characterised in that：The output end of power supply chip has one to pass through resistance R1 grounding connection power supplys
The ground connection shunt circuit of chip, it is defeated when power supply chip input input direct voltage Vi is the pulse voltage signal of 7～20V
Go out end and connect the I/O input ports of single-chip microcomputer, by be grounded shunt circuit process output end obtain output high level for 5 ±
The low voltage pulse voltage signal Vo of the pulse voltage signal of 0.25V and no more than 0.5V, the high low pulse voltage coverlet piece machine
CPU recognizes that be converted to corresponding data signal " 1 " and " 0 ", the pulse voltage signal of output is limited, and realizes pulse voltage
Amplitude limit, the amplitude of pulse voltage signal is limited within the scope of required.
The present invention has the advantages that compared to prior art.
Dutycycle is constant, and the signal of output is limited.The present invention has connection one to pass through using the output end in power supply chip
The ground connection shunt circuit of resistance R1 grounding connection power supply chips, obtaining in its output end can be identified as corresponding numeral by CPU
The high level of signal " 1 " and " 0 " is that 5 ± 0.25V, low-voltage are not more than the pulse voltage signal of 0.5V, and the high-low voltage reaches
Signal is processed and changed by ground connection shunt circuit, and the pulse frequency of output is identical with input, dutycycle is constant, the signal of output
It is limited, realizes the purpose of pulse amplitude limit, extends the use field of power supply chip.Solve prior art diode limiting
Circuit, triode amplitude limiter circuit or optocoupler change-over circuit, due in the signal and computer detection system of sensor output
Central processor CPU interface it is incompatible, the fluctuation of supply voltage easily causes signal instantaneous amplitude to increase extremely, extraneous big
Amplitude disturbing pulse scurries into circuit and causes signal condition of instant error to increase, and causes whole system supply voltage to raise, whole system
Components and parts be applied in more than work allow high voltage, components and parts will be by destruction problem.
Description of the drawings
Fig. 1 is the principle schematic of pulse amplitude limit change-over circuit of the present invention.
The present invention is further illustrated with reference to the accompanying drawings and examples, but does not therefore limit the present invention to described reality
Among applying a scope.
Specific embodiment
Refering to Fig. 1.In embodiment described below, a kind of pulse amplitude limit change-over circuit, including：Make as voltage-stabilized power supply
Power supply chip.Power supply chip model can be 78L05, and its Vi is the input of power supply chip N1-78L05, and Vo is power supply
The output end of chip N1-78L05.The output end of power supply chip have one by the ground connection of resistance R1 grounding connection power supply chips simultaneously
Connection loop, when power supply chip input input direct voltage Vi is the pulse voltage signal of 7～20V, output end connects
The I/O input ports of single-chip microcomputer, by being grounded shunt circuit the pulse electricity that output end acquisition output high level is 5 ± 0.25V is processed
The low voltage pulse voltage signal Vo of pressure signal and≤0.5V, the low and high level pulse voltage signal is recognized by singlechip CPU, turned
Corresponding data signal " 1 " and " 0 " are changed to, are that the amplitude of pulse voltage signal is limited within the scope of required, it is defeated
The pulse voltage signal for going out is limited, and realizes the amplitude limit of pulse voltage.
Pulse frequency and input identical, high-low voltage pulse that output end obtains output are processed by being grounded shunt circuit
Voltage signal Vo, is processed through being grounded shunt circuit, and output end vo is still pulse voltage signal.
Claims (4)
1. a kind of pulse amplitude limit change-over circuit, including：As the power supply chip that voltage-stabilized power supply is used, it is characterised in that：Power supply core
The output end of piece has a ground connection shunt circuit for passing through resistance R1 grounding connection power supply chips, when power supply chip input is input into directly
When stream voltage Vi is the pulse voltage signal of 7～20V, output end connects the I/O input ports of single-chip microcomputer, in parallel by being grounded
Loop processes output end and obtains output high level for the pulse voltage signal of 5 ± 0.25V and the low level pulse voltage of≤0.5V
Signal Vo, the low and high level pulse voltage signal recognized by singlechip CPU, is converted to corresponding data signal " 1 " and " 0 ", i.e.,
It is that the amplitude of pulse voltage signal is limited within the scope of required, the pulse voltage signal of output is limited, and realizes arteries and veins
Rush the amplitude limit of voltage.
2. pulse amplitude limit change-over circuit as claimed in claim 1, it is characterised in that：Power supply chip model 78L05, its Vi is
The input of power supply chip N1-78L05, Vo is the output end of power supply chip N1-78L05.
3. pulse amplitude limit change-over circuit as claimed in claim 1, it is characterised in that：Output end is processed by being grounded shunt circuit
Obtain the pulse frequency and input identical of output.
4. pulse amplitude limit change-over circuit as claimed in claim 1, it is characterised in that：High-low voltage pulse voltage signal Vo, Jing
The process of ground connection shunt circuit is crossed, output end vo is still pulse voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611085898.2A CN106598896B (en) | 2016-12-01 | 2016-12-01 | Pulse amplitude limiting conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611085898.2A CN106598896B (en) | 2016-12-01 | 2016-12-01 | Pulse amplitude limiting conversion circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106598896A true CN106598896A (en) | 2017-04-26 |
| CN106598896B CN106598896B (en) | 2021-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611085898.2A Active CN106598896B (en) | 2016-12-01 | 2016-12-01 | Pulse amplitude limiting conversion circuit |
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| Country | Link |
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| CN (1) | CN106598896B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1601910A (en) * | 2004-10-18 | 2005-03-30 | 大连大学 | So H2 line-frequency synchronous reverse integration A/D converter |
| CN101483395A (en) * | 2008-01-10 | 2009-07-15 | 电子科技大学 | Digital synchronous rectifying controller |
| CN203674974U (en) * | 2014-01-21 | 2014-06-25 | 邹海平 | Circuit for enhancing power supply impacting and interference resistance properties of power-take switch |
| CN104330621A (en) * | 2014-11-11 | 2015-02-04 | 苏州工业职业技术学院 | Electric appliance energy consumption tester |
| CN205596093U (en) * | 2016-05-05 | 2016-09-21 | 江苏方天电力技术有限公司 | Three phase current synchronization pulse signal generation circuit |
-
2016
- 2016-12-01 CN CN201611085898.2A patent/CN106598896B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1601910A (en) * | 2004-10-18 | 2005-03-30 | 大连大学 | So H2 line-frequency synchronous reverse integration A/D converter |
| CN101483395A (en) * | 2008-01-10 | 2009-07-15 | 电子科技大学 | Digital synchronous rectifying controller |
| CN203674974U (en) * | 2014-01-21 | 2014-06-25 | 邹海平 | Circuit for enhancing power supply impacting and interference resistance properties of power-take switch |
| CN104330621A (en) * | 2014-11-11 | 2015-02-04 | 苏州工业职业技术学院 | Electric appliance energy consumption tester |
| CN205596093U (en) * | 2016-05-05 | 2016-09-21 | 江苏方天电力技术有限公司 | Three phase current synchronization pulse signal generation circuit |
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| Publication number | Publication date |
|---|---|
| CN106598896B (en) | 2021-04-06 |
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