CN204945231U - Measure self-locking gas and put pipe trigger voltage and residual current device of releasing - Google Patents
Measure self-locking gas and put pipe trigger voltage and residual current device of releasing Download PDFInfo
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- CN204945231U CN204945231U CN201520744167.9U CN201520744167U CN204945231U CN 204945231 U CN204945231 U CN 204945231U CN 201520744167 U CN201520744167 U CN 201520744167U CN 204945231 U CN204945231 U CN 204945231U
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Abstract
Measure self-locking gas and put pipe trigger voltage and residual current device of releasing, comprise that gas puts the measuring circuit of tube discharge end, current sampling circuit, adjustable reference circuit, the first comparer, reference circuit, the second comparer, self-locking release control signal, residual current release control circuit single-chip microcomputer; Described current sampling circuit adopts three amplifier difference channels to carry out amplification collection to weak current, is serially connected in gas and puts in the measuring circuit of tube discharge end, for detecting gas-discharge tube; When applying gas discharge tube voltage and rising with given pace, gas is put in tube discharge end measuring circuit and is drawn curent change; The output of the positive termination adjustable reference circuit of the first comparer, negative terminal connects current sampling circuit and exports, and the output of the first comparer connects the anode input of the second comparer; Described reference circuit connects the negative terminal of the second comparer, for generation of comparison signal.The self-locking gas with high security is put pipe trigger voltage residual current device of releasing and is completed the measurement that gas puts pipe trigger voltage.
Description
Technical field
The utility model relates to a kind of self-locking gas with high security and puts pipe trigger voltage and residual current device system of releasing, and especially gas puts the circuit that pipe starts instantaneous measurement trigger voltage and closes voltage output, discharges residual charge.
Background technology
According to GB/T18802.311-2007, gas-discharge tube trigger voltage test judgement at voltage increase rate be measure between 100V/s to 2kV/s time, trigger voltage permissible variation is no more than 20%.How ensureing that can release energy fast, afterflow and concussion can not occur in guarantee when voltage rise puts pipe trigger voltage scope to gas, is the Focal point and difficult point of test clearance type lightning protection device.At present, domestic also do not have a kind of Circuits System can measure trigger voltage and residual charge of simultaneously releasing.
Utility model content
For above-mentioned technical matters, the utility model object is, provides a kind of structure simple, and safety coefficient is high and can high-acruracy survey trigger voltage a kind of Circuits System of residual charge of simultaneously releasing.
The utility model solves the problems of the technologies described above by the following technical solutions: a kind of self-locking gas with high security puts pipe trigger voltage and residual current device of releasing, measure self-locking gas and put pipe trigger voltage and residual current device of releasing, it is characterized in that, comprise that gas puts the measuring circuit of tube discharge end, current sampling circuit, adjustable reference circuit, the first comparer, reference circuit, the second comparer, self-locking release control signal, residual current release control circuit single-chip microcomputer; Described current sampling circuit adopts three amplifier difference channels to carry out amplification collection to weak current, is serially connected in the measuring circuit of gas-discharge tube discharge end; The output of the positive termination adjustable reference circuit of the first comparer, the negative terminal of the first comparer connects current sampling circuit and exports, and the output of the first comparer connects the anode input of the second comparer; Described reference circuit connects the negative terminal of the second comparer, for generation of the comparison signal of the second comparer; The second described comparer be used for first comparer produce low level signal and locking signal lock; Described self-locking release control signal connect and control single chip computer to the release of self-locking; Described residual current control circuit of releasing produces a control signal by latch signal and is connected on conducting and the shutoff that gas puts switching tube in tube discharge end measuring circuit or dry-reed relay K801A.
Described latch signal is on the one hand for being supplied to the signal that single-chip microcomputer stops measuring, on the other hand for controlling the startup of residual current leadage circuit, also have and be applied on the one hand gas for resetting and put high-pressure generating circuit on pipe, stop the continuation of high-pressure generating circuit voltage to export.
Circuit specific works process is as follows: when gas-discharge tube its voltage is lower than its trigger voltage, gas-discharge tube is equivalent to open circuit conditions, and its impedance is infinitely great, therefore during current sample, voltage is very little, and the positive terminal voltage of the first comparer 1 is higher than negative terminal voltage, and the first comparer 1 exports high level.When current sample voltage rise is to gas-discharge tube trigger voltage moment, gas-discharge tube starts instantaneously, is equivalent to short-circuit conditions, in loop, electric current is very large, make the negative terminal voltage of comparer 1 higher than positive terminal voltage, the first comparer 1 output low level, namely produces latch signal.The negative terminal voltage of the second comparer 2 is higher than positive terminal voltage, and the second comparer 2 output low level, this low level, by latch signal feedback line, makes the second comparer 2 maintain output low level, reaches lock function.Latch signal is supplied to single-chip microcomputer stopping measuring-signal simultaneously, and gas puts the measuring circuit open circuit of tube discharge end, opens residual current leadage circuit, and resetting voltage circuit for generating, stop the output of voltage.
Self-locking release principle: before carrying out new gas and putting pipe measurement, need discharge latching circuit.The high level giving the output terminal one of the 1st comparer lasting by self-locking release control signal circuit by control MCU, now the 2nd positive terminal voltage compared is higher than negative terminal voltage, and the 2nd comparer exports high level, and bleed-off circuit disconnects, MCU is output low level again, completes self-locking release movement.Now latching circuit can reuse.
The beneficial effects of the utility model are, the utility model proposes a kind of self-locking gas with high security and put pipe trigger voltage and residual current device system of releasing, can colleague that pipe trigger voltage measures put to gas the releasing residual current of safety, have that measuring accuracy is high, function is strong, security is high, structure is simple, easily realization and an Advantageous Effects such as with low cost.
Accompanying drawing explanation
Fig. 1 is that the self-locking gas that the utility model has a high security puts pipe trigger voltage and the residual current device system function module figure that releases;
Fig. 2 is that the self-locking gas that the utility model has a high security puts pipe trigger voltage and residual current device circuit system schematic diagram of releasing.
Embodiment
Below in conjunction with Figure of description, embodiment of the present utility model is described in further detail.
As shown in Figure 1, the utility model devises a kind of self-locking gas with high security and puts pipe trigger voltage and residual current device system of releasing, and comprises current sampling circuit, adjustable reference circuit, comparer 1, reference circuit, comparer 2, self-locking release control signal, residual current release control circuit.Described current sampling circuit adopts three amplifier difference channels to carry out amplification collection to weak current, is serially connected in measuring circuit, for detecting gas-discharge tube when voltage rises with given pace, and the curent change situation in loop; Described adjustable reference circuit, for regulating fiducial value, can work instantaneously so that comparer 1 starts at gas-discharge tube; Described comparer 1 adopts comparer LM393, for generation of the low level signal of self-locking; Described reference circuit is for generation of the comparison signal of comparer 2; Described comparer 2 adopts comparer LM393, locks for the low level signal produced comparer 1; Described self-locking release control signal is used for control single chip computer to the release of self-locking; Described residual current control circuit of releasing produces a control signal by latch signal, for controlling conducting and the shutoff of the dry-reed relay K801A be attempted by measuring circuit; Described latch signal for being supplied to the signal that single-chip microcomputer stops measuring, on the other hand for controlling the startup of residual current leadage circuit, also having and being used for resetting high-pressure circuit for generating on the one hand on the one hand, stops the continuation of voltage to export.
As shown in Figure 2, a kind of self-locking gas with high security puts pipe trigger voltage and residual current device system of releasing, F_I is the current detecting end of current sampling circuit, Current Control Mode PWM Switched controller SG3525 the 8th pin of the positive termination high-pressure generating circuit of diode D806.8 pins of G3525 are soft start incoming end, it connect a soft start capacitor, and when only having the soft start capacitor voltage charged on it to be high level, SG3525 just starts working.After the 8th pin is dragged down, SG3525, by soft start, makes voltage rise end of output.K801A is leakage current relay, after relay K 801A is closed, releases to the electric charge stored in measuring circuit.
LM393 is operational amplifier, and C815 electric capacity carries out filtering, makes U803B the 5th pin level level and smooth.5th pin and the 2nd pin are by the peripheral circuit number of setting magnitude of voltage, and slide rheostat RV2 can regulate the magnitude of voltage of the 5th pin, by the adjustment of slide rheostat, the voltage of pin 5 can be made to have variation range between 0V to 4V.2 pin reference voltages are set by R824 and R823 intrinsic standoff ratio, and its magnitude of voltage being input to 2 pins is about 1.57V.
In U803B, when the voltage of in-phase input end 5 pin is greater than the magnitude of voltage of inverting input 6 pin, 7 pin voltage export high level, otherwise, when in-phase input end voltage is less than anti-phase input terminal voltage, 7 pin output low levels, in like manner, U803A comparer is identical.
When amplifier 7 pin is low level, 3 pin output low levels, simultaneously by R826 by output feedack to the 7th pin, make this circuit keep output low level state, reach self-locking effect, make relay adhesive simultaneously.
Due to the existence of relay coil K801A inductance, can produce back-emf during shutoff, this back-emf likely peripheral circuits causes damage.At a relay input end diode in parallel, bleed-off circuit can be provided at shutdown moment, avoid the generation harm circuit of spike.
This circuit when measurement gas discharge tube trigger voltage, concrete operations in two steps:
The first step: before measurement, must make latching circuit reset, and relay K 801A disconnects.Now, a high level is exported, after continuing for some time at RES_Discharge pin by single-chip microcomputer, after making U803A export high level, RES_Discharge does not export, and now SG3525 can normally work, triode Q803 cut-off simultaneously, relay K 801A disconnects.
Second step: after starting test, detecting real-time current by F_I pin increases situation, when electric current exceedes certain value, U803B output low level.Now SG3525 soft start pin is dragged down, and SG3525 quits work, and relay K 801A closes simultaneously, memory point of releasing electric current.LOCK pin provides test settling signal to single-chip microcomputer simultaneously, stops test.Terminate this to measure, and provide trigger voltage value.
A kind of self-locking gas with high security of the utility model design puts pipe trigger voltage and residual current device system of releasing, when gas puts the moment that pipe both end voltage is elevated to trigger voltage, turning circuit increases instantaneously, instantaneous measurement can be started at gas amplifier tube to go out trigger voltage and close voltage simultaneously to export, release to residual charge, prevent tester to be electrically shocked.The utility model designed system has that measuring accuracy is high, function is many, reliability is high, is easy to realize, the advantage that security is high, structure is simple and with low cost.
To sum up, by set up and implement the utility model design the self-locking gas with high security put pipe trigger voltage and residual current device system of releasing, can realize putting pipe trigger voltage to gas to measure and residual current function of releasing, for the test accuracy of lightning protection instrument, element and the security of tester significant, there is wide market application foreground and economic worth.
By reference to the accompanying drawings embodiment of the present utility model is explained in detail above, but the utility model is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, can also make a variety of changes under the prerequisite not departing from the utility model aim.
Claims (2)
1. measure self-locking gas and put pipe trigger voltage and residual current device of releasing, it is characterized in that, comprise that gas puts the measuring circuit of tube discharge end, current sampling circuit, adjustable reference circuit, the first comparer, reference circuit, the second comparer, self-locking release control signal, residual current release control circuit single-chip microcomputer; Described current sampling circuit adopts three amplifier difference channels to carry out amplification collection to weak current, is serially connected in the measuring circuit of gas-discharge tube discharge end; The output of the positive termination adjustable reference circuit of the first comparer, the negative terminal of the first comparer connects current sampling circuit and exports, and the output of the first comparer connects the anode input of the second comparer; Described reference circuit connects the negative terminal of the second comparer, for generation of the comparison signal of the second comparer; The second described comparer be used for first comparer produce low level signal and locking signal lock; Described self-locking release control signal connect and control single chip computer to the release of self-locking; Described residual current control circuit of releasing produces a control signal by latch signal and is connected on conducting and the shutoff that gas puts switching tube in tube discharge end measuring circuit or dry-reed relay K801A.
2. measurement self-locking gas according to claim 1 puts pipe trigger voltage and residual current device of releasing, and it is characterized in that the first described comparer adopts comparer LM393.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520744167.9U CN204945231U (en) | 2015-09-23 | 2015-09-23 | Measure self-locking gas and put pipe trigger voltage and residual current device of releasing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520744167.9U CN204945231U (en) | 2015-09-23 | 2015-09-23 | Measure self-locking gas and put pipe trigger voltage and residual current device of releasing |
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| Publication Number | Publication Date |
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| CN204945231U true CN204945231U (en) | 2016-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520744167.9U Active CN204945231U (en) | 2015-09-23 | 2015-09-23 | Measure self-locking gas and put pipe trigger voltage and residual current device of releasing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137154A (en) * | 2015-09-23 | 2015-12-09 | 中国人民解放军理工大学 | Circuit for measuring starting voltage and discharging residual current of self-locking gas discharging pipe |
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2015
- 2015-09-23 CN CN201520744167.9U patent/CN204945231U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137154A (en) * | 2015-09-23 | 2015-12-09 | 中国人民解放军理工大学 | Circuit for measuring starting voltage and discharging residual current of self-locking gas discharging pipe |
| CN105137154B (en) * | 2015-09-23 | 2018-07-17 | 中国人民解放军理工大学 | It measures self-locking gas and puts pipe startup voltage and residual current circuit of releasing |
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