CN203457133U - Pulse signal acquisition circuit - Google Patents
Pulse signal acquisition circuit Download PDFInfo
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- CN203457133U CN203457133U CN201320340138.7U CN201320340138U CN203457133U CN 203457133 U CN203457133 U CN 203457133U CN 201320340138 U CN201320340138 U CN 201320340138U CN 203457133 U CN203457133 U CN 203457133U
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Abstract
The utility model discloses a pulse signal acquisition circuit which is practical, safe and reliable. The pulse signal acquisition circuit comprises an input pulse signal and an output pulse signal, wherein the input pulse signal can be converted into the output pulse signal through shaping of a pulse shaping circuit, and an overvoltage protection circuit is arranged between the input signal and the pulse shaping circuit. The overvoltage protection circuit arranged between the input pulse signal and the pulse shaping circuit enables the whole circuit to be safe and reliable.
Description
Technical field
The utility model relates to multifunctional electrical energy meter calibration field, and particularly a kind of pulse signal acquisition circuit, is applied to multifunctional pulse signal errors calculation element.
Background technology
Existing electric energy meter output of pulse signal mode has diversity, and the different way of outputs will could access main circuit to facilitate identification respectively after conversion.Electric energy meter output of pulse signal mode can be divided into active output and the large class of passive output two.
The active way of output does not need terminal that power supply is provided, and pulse signal voltage source amplitude is 3-15 V, pulsewidth 80:20ms, and electric energy meter and terminal have electric common point; The passive way of output needs terminal that power supply is provided, and electric energy meter and terminal are isolated by optical coupling, and the power supply that pulse signal voltage amplitude and terminal provide is suitable, pulsewidth 80: 20ms.Active pulse input voltage amplitude should mate to facilitate with main circuit identification and not damage circuit.Therefore in prior art, for the active pulse lower than matching voltage, need after booster circuit, access again.And need after step-down, access again the active pulse higher than matching voltage.The two cannot be compatible and mustn't wrong, otherwise can damage circuit or element.
The electric energy meter of passive pulse output can be divided into electronic on-off-type and relay-type two classes, and electronic on-off-type can be divided into again 3 kinds of the emitter way of outputs, the collector electrode way of output, the OC door way of output.But with regard to its output circuit feature, only have 2 kinds of positive pulse output and negative pulse outputs, the emitter way of output and the relay way of output, its output pulse is positive pulse; The output pulse of the collector electrode way of output and the OC door way of output is negative pulse.Passive pulse output current can not be excessive, otherwise can burn out element.Prior art to this must access main circuit before through current transducer by large current decay, little electric current does not need.The two cannot be compatible.
In prior art, when there is multichannel input, passive positive pulse common cathode connection and passive negative pulse altogether anodic bonding all can cause terminal cannot correctly gather electric energy meter pulse.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of practical, safe and reliable pulse signal acquisition overvoltage crowbar.
In order to solve above technical problem; a kind of practical, safe and reliable pulse signal acquisition circuit of the utility model; described pulse acquisition circuit comprises input pulse signal, output pulse signal; described input pulse signal is shaped as output pulse signal through pulse shaper; wherein, state between input signal and pulse shaper and be provided with overvoltage crowbar.
Preferably, described pulse shaper comprises optocoupler, and described input pulse signal comprises input pulse signal M, input pulse signal E, and described input pulse signal M connects the anode of optocoupler, and described input pulse signal E connects the negative electrode of optocoupler.
Preferably, described overvoltage crowbar comprises the backward diode D1 that is located between input pulse signal M and optocoupler, is located at the backward diode D2 between input pulse signal E and optocoupler.
Preferably, described overvoltage crowbar also comprise be located at optocoupler anode on draw thermistor R1, be located at the drop-down thermistor R2 of optocoupler negative electrode.
Preferably, the collector electrode of described optocoupler connects described output pulse signal end, and the collector electrode of described optocoupler is provided with pull-up resistor, and the emitter of described optocoupler connects with reference to ground.
Preferably, the emitter of described optocoupler connects described output pulse signal end, and the emitter of described optocoupler is provided with pull down resistor, and the emitter of described optocoupler is electrically connected to light current power supply.
By pulse shaper is set, after being entered to shaping, pulse input signal exports to once again pulse signal acquisition device, and make pulse signal acquisition device can complete accurately and effectively the pulse signal detection to electric energy meter.Adopt optocoupler to carry out shaping simultaneously, make input pulse signal and output pulse signal when completing shaping conversion, between two, formed isolation, be to isolate between electric energy meter, avoid the high-voltage signal pulse signals harvester of electric power meter end to form voltge surge, guaranteed the verification that obtains that electric energy meter can be safe.
By backward diode is set, make to occur under high-pressure situations at input pulse signal, utilize the reverse cut-off characteristics of backward diode to stop high-voltage signal to enter optocoupler, on the basis of light-coupled isolation, increased one deck protection, guaranteed also to have protected optocoupler when electric energy meter can obtain verification safely; Thermistor is set simultaneously, is high-voltage signal and while being prevented from, the electric current that flows through thermistor can increase rapidly at input pulse signal, directly causes the temperature of thermistor to rise, resistance becomes large, to guarantee that circuit can be not impaired.
Therefore, when this pulse signal acquisition circuit has been realized the effective shaping conversion between pulse input and pulse output, also realize effective isolation, to the pulse signal acquisition device of rear end, provide overvoltage protection.Reduced the circuit interference that input pulse causes main circuit.Well compatible multiple pulse input has good vulnerability to jamming and fail safe simultaneously.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
Fig. 1 is the circuit theory diagrams of the utility model pulse signal acquisition circuit embodiments 1;
Fig. 2 is the circuit theory diagrams of the utility model pulse signal acquisition circuit embodiments 2.
Embodiment
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, it will be more clear making above-mentioned and other object of the present utility model, Characteristics and advantages.In whole accompanying drawings, identical Reference numeral is indicated identical part.Deliberately do not draw in proportion accompanying drawing, focus on illustrating purport of the present utility model.
Embodiment 1:
As shown in Figure 1; a kind of pulse signal acquisition circuit of the utility model; described pulse acquisition circuit comprises input pulse signal, output pulse signal; described input pulse signal is shaped as output pulse signal through pulse shaper; wherein, between described input pulse signal and pulse shaper, be provided with overvoltage crowbar.In the present embodiment, described pulse shaper comprises optocoupler U1, and described input pulse signal comprises input pulse signal M, input pulse signal E, and described input pulse signal M connects the anode of optocoupler U1, and described input pulse signal E connects the negative electrode of optocoupler U1.
In the present embodiment, described overvoltage crowbar comprises the backward diode D1 that is located between input pulse signal M and optocoupler, is located at the backward diode D2 between input pulse signal E and optocoupler.The negative electrode of described backward diode D1 connects input pulse signal M, the anode of optocoupler U1 described in the anodic bonding of described backward diode D1; The negative electrode of optocoupler U1 described in the anodic bonding of the D2 of described backward diode, the negative electrode of described backward diode D2 connects described input pulse signal E.Described overvoltage crowbar also comprise be located at optocoupler anode on draw thermistor R1, be located at the drop-down thermistor R2 of optocoupler negative electrode.On described, draw one end of thermistor R1 to connect light current power supply VCC, draw on described the other end of thermistor R1 to connect the anode of described backward diode D1.One end of described drop-down thermistor R2 connects with reference to ground, and the other end of described drop-down thermistor R2 connects the negative electrode of described backward diode D2.
In the present embodiment, the collector electrode of described optocoupler U1 connects described output pulse signal MC, and the collector electrode of described optocoupler U1 is provided with pull-up resistor R3, and the emitter of described optocoupler U1 connects with reference to ground.
The operation principle of the present embodiment: the signal of the electric energy meter output being verified is as input pulse signal M, input pulse signal E, and input pulse signal M and input pulse signal E process optocoupler U1 shaping convert output pulse signal MC to and oppositely export to pulse signal acquisition device.If in checking procedure, while there is the output output high voltage of input misconnection or electric energy meter, first the reverse cut-off characteristics of backward diode D1, D2 enters optocoupler by prevention high-voltage signal, in the situation that having protected pulse signal acquisition device, has also guaranteed the safety of optocoupler; When there is high pressure in electric energy meter secondly, the electric current that flows through thermistor can increase rapidly, directly cause thermistor temp to rise, resistance becomes greatly to guarantee that circuit can be not impaired, after voltage recovers normally, the electric current that flows through thermistor also can correspondingly reduce, and the temperature of thermistor declines thereupon, now the resistance of thermistor recovers normal, and it is normal that whole pulse signal acquisition circuit recovers
Embodiment 2:
As shown in Figure 2, the difference of the present embodiment and above-described embodiment 1 is, the emitter of described optocoupler U1 connects described output pulse signal MC, and the emitter of described optocoupler U1 is provided with pull down resistor R4, and the emitter of described optocoupler U1 is electrically connected to light current power supply VCC.
By pulse shaper is set, after being entered to shaping, pulse input signal exports to once again pulse signal acquisition device, and make pulse signal acquisition device can complete accurately and effectively the pulse signal detection to electric energy meter.Adopt optocoupler to carry out shaping simultaneously, make input pulse signal and output pulse signal when completing shaping conversion, between two, formed isolation, be to isolate between electric energy meter, avoid the high-voltage signal pulse signals harvester of electric power meter end to form voltge surge, guaranteed the verification that obtains that electric energy meter can be safe.
By backward diode is set, make to occur under high-pressure situations at input pulse signal, utilize the reverse cut-off characteristics of backward diode to stop high-voltage signal to enter optocoupler, on the basis of light-coupled isolation, increased one deck protection, guaranteed also to have protected optocoupler when electric energy meter can obtain verification safely; Thermistor is set simultaneously, is high-voltage signal and while being prevented from, the electric current that flows through thermistor can increase rapidly at input pulse signal, directly causes the temperature of thermistor to rise, resistance becomes large, to guarantee that circuit can be not impaired.
Therefore, when this pulse signal acquisition circuit has been realized the effective shaping conversion between pulse input and pulse output, also realize effective isolation, to the pulse signal acquisition device of rear end, provide overvoltage protection.Reduced the circuit interference that input pulse causes main circuit.Well compatible multiple pulse input has good vulnerability to jamming and fail safe simultaneously.
In above description, a lot of details have been set forth so that fully understand the utility model.But above description is only preferred embodiment of the present utility model, the utility model can be implemented to be much different from alternate manner described here, so the utility model is not subject to the restriction of disclosed concrete enforcement above.Any skilled personnel are not departing from technical solutions of the utility model scope situation simultaneously, all can utilize method and the technology contents of above-mentioned announcement to make many possible changes and modification to technical solutions of the utility model, or be revised as the equivalent embodiment of equivalent variations.Every content that does not depart from technical solutions of the utility model,, all still belongs in the scope of technical solutions of the utility model protection any simple modification made for any of the above embodiments, equivalent variations and modification according to technical spirit of the present utility model.
Claims (6)
1. a pulse signal acquisition circuit; described pulse acquisition circuit comprises input pulse signal, output pulse signal; described input pulse signal is shaped as output pulse signal through pulse shaper; it is characterized in that, state between input pulse signal and pulse shaper and be provided with overvoltage crowbar.
2. pulse signal acquisition circuit according to claim 1, it is characterized in that, described pulse shaper comprises optocoupler, described input pulse signal comprises input pulse signal M, input pulse signal E, described input pulse signal M connects the anode of optocoupler, and described input pulse signal E connects the negative electrode of optocoupler.
3. pulse signal acquisition circuit according to claim 2, is characterized in that, described overvoltage crowbar comprises the backward diode D1 that is located between input pulse signal M and optocoupler, is located at the backward diode D2 between input pulse signal E and optocoupler.
4. pulse signal acquisition circuit according to claim 3, is characterized in that, described overvoltage crowbar also comprise be located at optocoupler anode on draw thermistor, be located at the drop-down thermistor of optocoupler negative electrode.
5. pulse signal acquisition circuit according to claim 2, is characterized in that, the collector electrode of described optocoupler connects described output pulse signal end, and the collector electrode of described optocoupler is provided with pull-up resistor, and the emitter of described optocoupler connects with reference to ground.
6. pulse signal acquisition circuit according to claim 2, is characterized in that, the emitter of described optocoupler connects described output pulse signal end, and the emitter of described optocoupler is provided with pull down resistor, and the emitter of described optocoupler is electrically connected to light current power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320340138.7U CN203457133U (en) | 2013-06-14 | 2013-06-14 | Pulse signal acquisition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320340138.7U CN203457133U (en) | 2013-06-14 | 2013-06-14 | Pulse signal acquisition circuit |
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| Publication Number | Publication Date |
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| CN203457133U true CN203457133U (en) | 2014-02-26 |
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| CN201320340138.7U Expired - Fee Related CN203457133U (en) | 2013-06-14 | 2013-06-14 | Pulse signal acquisition circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103297033A (en) * | 2013-06-14 | 2013-09-11 | 南京电力自动化设备三厂有限公司 | Pulse signal acquisition circuit |
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2013
- 2013-06-14 CN CN201320340138.7U patent/CN203457133U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103297033A (en) * | 2013-06-14 | 2013-09-11 | 南京电力自动化设备三厂有限公司 | Pulse signal acquisition circuit |
| CN103297033B (en) * | 2013-06-14 | 2016-06-08 | 南京电力自动化设备三厂有限公司 | A kind of pulse signal acquisition circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140226 Termination date: 20160614 |
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| CF01 | Termination of patent right due to non-payment of annual fee |