CN203617681U - Pulse over-current detection and protection circuit - Google Patents
Pulse over-current detection and protection circuit Download PDFInfo
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- CN203617681U CN203617681U CN201320780228.8U CN201320780228U CN203617681U CN 203617681 U CN203617681 U CN 203617681U CN 201320780228 U CN201320780228 U CN 201320780228U CN 203617681 U CN203617681 U CN 203617681U
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- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 230000004224 protection Effects 0.000 title abstract description 6
- 238000007493 shaping process Methods 0.000 claims abstract description 29
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 230000001681 protective effect Effects 0.000 claims description 9
- 102100023702 C-C motif chemokine 13 Human genes 0.000 claims description 3
- 102100039435 C-X-C motif chemokine 17 Human genes 0.000 claims description 3
- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 claims description 3
- 101100382872 Homo sapiens CCL13 gene Proteins 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000000541 pulsatile effect Effects 0.000 description 1
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Abstract
The utility model discloses a pulse over-current detection and protection circuit. A synchronizing signal is connected with a controller through a first shaping circuit and a first logical judgment circuit, a current sampling signal and a threshold signal are connected with a second shaping circuit through a voltage comparator, the second shaping circuit is connected with the controller through a second logical judgment circuit, and the first shaping circuit is connected with the controller through the second logical judgment circuit. The continuous over-current number is arranged by the structure, sensitivity can be adjusted according to performance of a magnetron, continuous detection can be carried out, and the pulse over-current detection and protection circuit is simple in structure, low in cost and high in anti-interference capability.
Description
Technical field:
The utility model relates to a kind of detection and protective circuit of pulse overcurrent.
Background technology:
In accelerator application industry, normally used radio frequency amplifier tube is magnetron, and its price comparison costliness, therefore for guaranteeing the useful life of magnetron, conventionally to monitor its operating state, prevent it because of repeatedly sparking, overcurrent and cause irreversible damage.Because magnetron is operated under the operating state of high voltage, short pulse duration, repetition, the state of its work is unsettled, and overcurrent work single or interval allows, and continuous several times overcurrent just can impact its service behaviour.Present technology is many because of the synchronous of paired pulses electric current and very difficult to burst pulse seizure; the overcurrent protections that adopt only for direct after its electric current is sampled and threshold values compare more; like this under magnetron is operated in current state; because its electromagnetic environment is very complicated; this protection just seem too " sensitive "; be easy to cause wrong report fault because the electromagnetic environment self producing disturbs, affect the availability of itself.
Utility model content:
The utility model will solve too high in electromagnetic environment protection medium sensitivity or easily report the problem of fault by mistake, proposes a kind of pulse over-current detection and protective circuit.
In order to solve the problems of the technologies described above; the technical solution of the utility model is; a kind of pulse over-current detection and protective circuit; comprise synchronizing signal; current sampling signal; threshold values signal; described synchronizing signal is connected with controller by the first shaping circuit, the first logic judging circuit; described current sampling signal is connected with the second shaping circuit by voltage comparator with threshold values signal; the second described shaping circuit is connected with controller by the second logic judging circuit, and the first described shaping circuit is connected with controller by the second logic judging circuit.
The first described shaping circuit comprises the first monostable flipflop, delay circuit, the second monostable flipflop composition, described synchronizing signal is connected with the input of the first monostable flipflop, the output of the first described monostable flipflop is connected with the input of the second monostable flipflop by delay circuit, two outputs of the second monostable flipflop are connected with the first logic judging circuit and the second logic judging circuit respectively, the second described shaping circuit is made up of the 3rd monostable flipflop, the output of described voltage comparator is connected with the input of the 3rd monostable flipflop, the output of the 3rd monostable flipflop is connected with the second logic judging circuit.
The first described logic judging circuit is made up of resistance R 1, resistance R 2, triode V1, optocoupler N1A, an output of the second described monostable flipflop is connected with the base stage of triode V1 by resistance R 2, the collector electrode of described triode V1 is connected with 2 pin of optocoupler N1A, the grounded emitter of triode V1,1 pin of optocoupler N1A is connected with NCC1 by resistance R 1,7 pin of optocoupler N1A connect controller, and optocoupler N1A8 pin meets VCC2.
The second logic judging circuit has resistance R 3, resistance R 4, resistance R 5, optocoupler N1B, triode V2, triode V3 composition, another output of the second described monostable flipflop is connected with the base stage of triode V2 by resistance R 3, the emitter of triode V2 is connected with VCC1, the collector electrode of triode V2 is connected with 3 pin of optocoupler N1B by resistance R 4, the output of the 3rd monostable flipflop is connected with the base stage of triode V3 by resistance R 5, the collector electrode of triode V3 is connected with 4 pin of optocoupler N1B, the grounded emitter of triode V3, 6 pin of described optocoupler N1B meet VCC2, 5 pin of optocoupler N1B connect controller.
The utility model compared with prior art, synchronizing signal is by the first shaping circuit, the first logic judging circuit is connected with controller, described current sampling signal is connected with the second shaping circuit by voltage comparator with threshold values signal, the second described shaping circuit is connected with controller by the second logic judging circuit, the first described shaping circuit is connected with controller by the second logic judging circuit, this structure arranges the number of times of continuous overcurrent, sensitivity can basis performance regulate, can detect continuously, and simple in structure, cost is low, antijamming capability is strong.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further details;
Fig. 1 is the utility model structural representation;
In Fig. 1,1, the first monostable flipflop, 2, delay circuit, 3, the second monostable flipflop, 4, voltage comparator, 5, the 3rd monostable flipflop, 6, controller.
Embodiment:
As shown in Figure 1; a kind of pulse over-current detection and protective circuit; comprise synchronizing signal; current sampling signal; threshold values signal, described synchronizing signal is connected with controller by the first shaping circuit, the first logic judging circuit, and described current sampling signal is connected with the second shaping circuit by voltage comparator 4 with threshold values signal; the second described shaping circuit is connected with controller by the second logic judging circuit, and the first described shaping circuit is connected with controller 6 by the second logic judging circuit.
The first described shaping circuit comprises the first monostable flipflop 1, delay circuit 2, the second monostable flipflop 3 forms, described synchronizing signal is connected with the input of the first monostable flipflop 1, the output of the first described monostable flipflop 1 is connected with the input of the second monostable flipflop 3 by delay circuit 2, two outputs of the second monostable flipflop 3 are connected with the first logic judging circuit and the second logic judging circuit respectively, the second described shaping circuit is made up of the 3rd monostable flipflop 5, the output of described voltage comparator 4 is connected with the input of the 3rd monostable flipflop 5, the output of the 3rd monostable flipflop 5 is connected with the second logic judging circuit.
The first described logic judging circuit is made up of resistance R 1, resistance R 2, triode V1, optocoupler N1A, an output of the second described monostable flipflop 3 is connected with the base stage of triode V1 by resistance R 2, the collector electrode of described triode V1 is connected with 2 pin of optocoupler N1A, the grounded emitter of triode V1,1 pin of optocoupler N1A is connected with NCC1 by resistance R 1,7 pin of optocoupler N1A connect controller 6, and optocoupler N1A8 pin meets VCC2.
The second logic judging circuit has resistance R 3, resistance R 4, resistance R 5, optocoupler N1B, triode V2, triode V3 composition, another output of the second described monostable flipflop 3 is connected with the base stage of triode V2 by resistance R 3, the emitter of triode V2 is connected with VCC1, the collector electrode of triode V2 is connected with 3 pin of optocoupler N1B by resistance R 4, the output of the 3rd monostable flipflop 5 is connected with the base stage of triode V3 by resistance R 5, the collector electrode of triode V3 is connected with 4 pin of optocoupler N1B, the grounded emitter of triode V3, 6 pin of described optocoupler N1B meet VCC2, 5 pin of optocoupler N1B connect controller 6.
The synchronizing signal of system is the trigger source that produces magnetron pulse electric current, but from synchronizing signal to producing the time delay that has a time pulse current, sampling return current signal than synchronizing signal a little later, so add a delay circuit to realize the compensation in time of synchronizing signal and current sampling signal after the first monostable flipflop 1 in synchronizing signal;
Current sampling signal and threshold values signal are through over-voltage comparator comparison, if current sampling signal abnormal (overcurrent), the burst pulse of voltage comparator output and current signal same widths, this pulse duration is very narrow, carry out subsequent treatment, must process through the 3rd monostable flipflop 5, widen its width to 2ms;
Synchronizing signal is divided into the signal of the positive negative two-way 1ms of amplitude one after delay circuit after the second monostable flipflop 3 carries out shaping again, between this two paths of signals, be synchronous, wherein a road positive signal drives triode V1 by resistance R 2, make it conducting, make optocoupler N1A conducting, 7 pin of optocoupler N1A have the positive pulse of a 1ms, and the timing point 1 of controller is sent in this one end; The other road undersuing that the second monostable flipflop 3 carries out shaping output drives positive-negative-positive triode V2, represent that now synchronizing signal has arrived, can go whether judge overcurrent, whether at this moment judge after current sampling signal and threshold values signal are relatively has pulse to export again after the 3rd monostable flipflop carries out shaping, if had, driving that can NPN triode V3 will be cut off, not conducting of optocoupler N1B, 5 pin of optocoupler N1B do not have positive pulse and output to controller, are now judged to be pulsatile once overcurrent; By this method, utilize the signal of synchronization signal detection point detection over current fault whether continuous, as discontinuous; reset controller is counted again, the value arranging as reached continuously controller software, PLC output signal; cut off synchronizing signal, pulse is no longer exported, to protect magnetron.This structure arranges the number of times of continuous overcurrent, and sensitivity can regulate according to the performance of magnetron, reaches and does not damage magnetron, the object that can normally work continuously again.
Claims (4)
1. a pulse over-current detection and protective circuit; comprise synchronizing signal; current sampling signal; threshold values signal; it is characterized in that: described synchronizing signal is connected with controller by the first shaping circuit, the first logic judging circuit; described current sampling signal is connected with the second shaping circuit by voltage comparator (4) with threshold values signal; the second described shaping circuit is connected with controller by the second logic judging circuit, and the first described shaping circuit is connected with controller (6) by the second logic judging circuit.
2. a kind of pulse over-current detection according to claim 1 and protective circuit, it is characterized in that: the first described shaping circuit comprises the first monostable flipflop (1), delay circuit (2), the second monostable flipflop (3) composition, described synchronizing signal is connected with the input of the first monostable flipflop (1), the output of the first described monostable flipflop 1 is connected with the input of the second monostable flipflop (3) by delay circuit (2), two outputs of the second monostable flipflop (3) are connected with the first logic judging circuit and the second logic judging circuit respectively, the second described shaping circuit is made up of the 3rd monostable flipflop (5), the output of described voltage comparator (4) is connected with the input of the 3rd monostable flipflop (5), the output of the 3rd monostable flipflop (5) is connected with the second logic judging circuit.
3. a kind of pulse over-current detection according to claim 2 and protective circuit; it is characterized in that: the first described logic judging circuit is made up of resistance R 1, resistance R 2, triode V1, optocoupler N1A; an output of described the second monostable flipflop (3) is connected with the base stage of triode V1 by resistance R 2; the collector electrode of described triode V1 is connected with 2 pin of optocoupler N1A; the grounded emitter of triode V1; 1 pin of optocoupler N1A is connected with NCC1 by resistance R 1; 7 pin of optocoupler N1A connect controller 6, and optocoupler N1A8 pin meets VCC2.
4. according to a kind of pulse over-current detection and protective circuit described in claim 2 or 3, it is characterized in that: the second described logic judging circuit is by resistance R 3, resistance R 4, resistance R 5, optocoupler N1B, triode V2, triode V3 composition, another output of the second described monostable flipflop 3 is connected with the base stage of triode V2 by resistance R 3, the emitter of triode V2 is connected with VCC1, the collector electrode of triode V2 is connected with 3 pin of optocoupler N1B by resistance R 4, the output of the 3rd monostable flipflop 5 is connected with the base stage of triode V3 by resistance R 5, the collector electrode of triode V3 is connected with 4 pin of optocoupler N1B, the grounded emitter of triode V3, 6 pin of described optocoupler N1B meet VCC2, 5 pin of optocoupler N1B connect controller (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320780228.8U CN203617681U (en) | 2013-11-30 | 2013-11-30 | Pulse over-current detection and protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320780228.8U CN203617681U (en) | 2013-11-30 | 2013-11-30 | Pulse over-current detection and protection circuit |
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| Publication Number | Publication Date |
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| CN203617681U true CN203617681U (en) | 2014-05-28 |
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| CN201320780228.8U Expired - Fee Related CN203617681U (en) | 2013-11-30 | 2013-11-30 | Pulse over-current detection and protection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109239446A (en) * | 2018-08-03 | 2019-01-18 | 广东美的制冷设备有限公司 | AC overvoltage detection circuit, air conditioner, internal machine of air-conditioner and its control panel |
| CN113466666A (en) * | 2021-07-06 | 2021-10-01 | 格力电器（郑州）有限公司 | Mainboard detection device and detection method |
| CN117895420A (en) * | 2024-03-14 | 2024-04-16 | 电子科技大学 | Pulse width detection protection circuit for power module of rotary traveling wave tube |
-
2013
- 2013-11-30 CN CN201320780228.8U patent/CN203617681U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109239446A (en) * | 2018-08-03 | 2019-01-18 | 广东美的制冷设备有限公司 | AC overvoltage detection circuit, air conditioner, internal machine of air-conditioner and its control panel |
| CN113466666A (en) * | 2021-07-06 | 2021-10-01 | 格力电器（郑州）有限公司 | Mainboard detection device and detection method |
| CN117895420A (en) * | 2024-03-14 | 2024-04-16 | 电子科技大学 | Pulse width detection protection circuit for power module of rotary traveling wave tube |
| CN117895420B (en) * | 2024-03-14 | 2024-06-07 | 电子科技大学 | Pulse width detection protection circuit for power module of rotary traveling wave tube |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140528 |