CN203800556U - Microcomputer protection device exit relay drive circuit - Google Patents
Microcomputer protection device exit relay drive circuit Download PDFInfo
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- CN203800556U CN203800556U CN201420228549.1U CN201420228549U CN203800556U CN 203800556 U CN203800556 U CN 203800556U CN 201420228549 U CN201420228549 U CN 201420228549U CN 203800556 U CN203800556 U CN 203800556U
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- 238000005070 sampling Methods 0.000 claims abstract description 21
- 230000008878 coupling Effects 0.000 claims description 41
- 238000010168 coupling process Methods 0.000 claims description 41
- 238000005859 coupling reaction Methods 0.000 claims description 41
- 230000000903 blocking effect Effects 0.000 claims description 23
- 239000003990 capacitor Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 abstract description 9
- 230000005693 optoelectronics Effects 0.000 abstract 3
- 206010070834 Sensitisation Diseases 0.000 description 20
- 230000008313 sensitization Effects 0.000 description 20
- 238000001514 detection method Methods 0.000 description 11
- 230000006872 improvement Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model discloses a microcomputer protection device exit relay drive circuit comprising a current sampling circuit, an optoelectronic coupler, a logic electric level converting circuit and a logic locking drive circuit, wherein the current sampling circuit is connected with a switch part of an exit relay, the optoelectronic coupler is driven by the current sampling circuit, an input end of the logic electric level converting circuit is connected with an output end of the optoelectronic coupler, an output end of the logic electric level converting circuit is connected with an input end of the logic locking drive circuit, and an output end of the logic locking drive circuit is connected with a wire coil of the exit relay. The microcomputer protection device exit relay drive circuit of the utility model solves the technical problem that a microcomputer protection device exit relay protection method of the prior art is complex in design and high in cost, and invalid protection is caused because zero-crossing currents cannot be detected.
Description
Technical field
The utility model relates to protecting electrical power system technical field, relates in particular to a kind of drive circuit of microcomputer protecting device exit relay.
Background technology
Microcomputer protecting device is widely used in electric power system secondary protection system; general employing embedded microprocessor is that core is to primary equipment; circuit breaker for example; carry out electric current and voltage analog quantity, switching value and analysis; according to the logical algorithm of relaying protection; exit relay by device, carries out breaking-closing operating to circuit breaker, realizes a circuit failure removal protection.
Exit relay in microcomputer protecting device by its normally opened contact close circuit breaker minute, closing coil loop, make the energising of separating brake or closing coil, correspondingly produce breaker open operation or feed motion.When circuit breaker completes after disjunction or closed procedure, it is connected on respectively minute, the contacts status in closing coil loop changes, and former off-state becomes closure state, and former closure state becomes off-state.Because the branch wire time of circuit breaker is different, sometimes circuit breaker also may break down, cause the electrification time of divide-shut brake wire loop long, and divide-shut brake coil drive current is large, if now disjunction closing coil loop left by force by exit relay, can cause the contact of exit relay to produce arcing, when serious, relay contact be burnt.
Publication No. is CN102684135A; date of publication is the guard method that 2012.09.19 Chinese patent discloses a kind of circuit-breaker operation interface repeat circuit; the circuit that the method is used in conjunction with comprises current detection circuit, closing circuit and CPU; aforementioned relay is positioned at closing circuit; the method is: by current detection circuit, detect in closing circuit, whether there is electric current; while having electric current in closing circuit being detected; current detection circuit will be to CPU output signal; CPU has received after current signal, controls the relay closes in closing circuit.For fear of interference, when receiving, CPU closes a floodgate after order, and current detection circuit starts to detect in closing circuit, whether have electric current.For guaranteeing that current detection circuit, when using alternating current operation power supply, can accurately collect current signal, the every 1ms of current detection circuit detects a closing circuit, and the time of relay closes is 20ms.But, while using AC power in divide-shut brake loop, near alternating voltage zero-crossing point, can produce of short duration current over-zero, now current detection circuit can not detect electric current, thereby causes relay misoperation to be done, thereby this guard method was lost efficacy.In addition, adopt CPU cost relatively high, the operating circuit design relative complex of CPU, anti-interference is poor, and reliability is lower.
Utility model content
For this reason; the technical problems to be solved in the utility model is the microcomputer protecting device exit relay guard method of prior art; circuit design relative complex; cost is higher; and can not detect zero current cross and cause protection to be lost efficacy, thereby propose a kind of drive circuit of the microcomputer protecting device exit relay that can address this problem.
For solving the problems of the technologies described above, the utility model by the following technical solutions:
A kind of drive circuit of microcomputer protecting device exit relay; comprise the photoelectrical coupler that the current sampling circuit that is connected with the switch block of exit relay and this current sampling circuit drive; also comprise logic level converting circuit, logic blocking drive circuit; the input of described logic level converting circuit is connected with the output of photoelectrical coupler; the output of described logic level converting circuit is connected with the input of logic blocking drive circuit, and the output of described logic blocking drive circuit is connected with the coil of described exit relay.
As further improvement of the utility model, described logic level converting circuit comprises pull-up resistor, filter capacitor, and one end of described pull-up resistor is connected with power supply, and the other end is connected with the collector electrode of the photoinduction triode of described photoelectrical coupler; Described filter capacitor is in parallel with the output of described photoelectrical coupler; The grounded emitter of the photoinduction triode of described photoelectrical coupler.
As further improvement of the utility model; described logic blocking drive circuit comprises and door; described with door an input be connected with the collector electrode of the photoinduction triode of described photoelectrical coupler; described with door another input be connected with the control signal of microcomputer protecting device, described with output be connected with the coil of described exit relay.
As further improvement of the utility model, described logic level converting circuit comprises pull down resistor, filter capacitor, one end ground connection of described pull down resistor, and the other end is connected with the emitter of the photoinduction triode of described photoelectrical coupler; Described filter capacitor is in parallel with described pull down resistor; The collector electrode of the photoinduction triode of described photoelectrical coupler connects power supply.
As further improvement of the utility model; described logic blocking drive circuit comprises NOR gate; an input of described NOR gate is connected with the emitter of the photoinduction triode of described photoelectrical coupler; another input of described NOR gate is connected with the control signal of microcomputer protecting device, and the output of described NOR gate is connected with the coil of described exit relay.
As further improvement of the utility model, described current sampling circuit comprises forward sample circuit in parallel and reverse sample circuit, described forward sample circuit and oppositely sample circuit comprise respectively the diode of several series aiding connections, and described forward sample circuit and the reverse opposite direction of diode in sample circuit.
As further improvement of the utility model, described photoelectrical coupler is bi-directional light electric coupling.
The beneficial effect of the drive circuit of microcomputer protecting device exit relay of the present utility model is:
(1) drive circuit of microcomputer protecting device exit relay of the present utility model, the on off state of the sensitization triode of photoelectrical coupler converts logic level signal (low level or high level) to through logic level converting circuit.This logic level signal is by after logic blocking drive circuit, by the output locking of logic blocking drive circuit or unlocking signal, to control energising or the off-position of the coil of exit relay.When breaker open operation or closing circuit have electric current to pass through, logic blocking drive circuit output block signal, make the coil of exit relay keep "on" position, the normally opened contact of exit relay is closure state, until the electric current flowing through in separating brake or closing circuit is zero, logic blocking drive circuit is exported unlocking signal, and then makes the coil blackout of exit relay, and the normally opened contact of exit relay disconnects.Avoid thus the normally opened contact of exit relay in divide-shut brake loop, have electric current by time disconnect and cause damage.Compared with prior art, circuit design is more simple, reduces costs.
(2) drive circuit of microcomputer protecting device exit relay of the present utility model, pull-up resistor is realized the logic level transition of on off state of the sensitization triode of bi-directional light electric coupling, when separating brake or closing circuit have electric current, the switch closed condition of the sensitization triode of bi-directional light electric coupling is converted into logic low; Otherwise when separating brake or closing circuit no current, the switch open state of the sensitization triode of bi-directional light electric coupling is converted into logic high.Process and door, when separating brake or closing circuit have electric current, all the time by logic low locking, kept output logic low level with door, make the coil of exit relay keep "on" position, until separating brake or closing circuit do not have electric current to flow through, the sensitization triode of bi-directional light electric coupling is opened, this opening is converted into logic high, with door unlocking, determine with the output signal of the door control signal by microcomputer protecting device, be that the control signal of microcomputer protecting device is while being logic high, the coil no power of exit relay, normally opened contact disconnects, when the control signal of microcomputer protecting device is logic low, the coil electricity of exit relay, normally opened contact is closed, avoids thus the normally opened contact of exit relay to cut-off having divide-shut brake loop that electric current passes through to cause the problem of damage.
(3) drive circuit of microcomputer protecting device exit relay of the present utility model; when breaker open operation or closing circuit adopt AC power; near alternating voltage zero-crossing point, can make loop produce of short duration current over-zero, cause the closure in short-term of the phototriode of bi-directional light electric coupling.By the charging of filter capacitor, stop pull-up resistor fast level to be pulled to high level, thereby avoid because of short duration zero passage makes and door unlocking.
(4) drive circuit of microcomputer protecting device exit relay of the present utility model, pull down resistor is realized the logic level transition of on off state of the sensitization triode of bi-directional light electric coupling, when separating brake or closing circuit have electric current, the switch closed condition of the sensitization triode of bi-directional light electric coupling is converted into logic high; Otherwise when separating brake or closing circuit have electric current, the switch open state of the sensitization triode of bi-directional light electric coupling is converted into logic low.Through NOR gate, when separating brake or closing circuit have electric current, NOR gate is kept output logic low level by logic high locking all the time, make the coil of exit relay keep "on" position, until separating brake or closing circuit do not have electric current to flow through, the sensitization triode of bi-directional light electric coupling is opened, this opening is converted into logic low, NOR gate unlocking, the output signal of NOR gate is determined by the control signal of microcomputer protecting device, be that the control signal of microcomputer protecting device is while being logic high, the coil no power of exit relay, normally opened contact disconnects, when the control signal of microcomputer protecting device is logic low, the coil electricity of exit relay, normally opened contact is closed, avoids thus the normally opened contact of exit relay to cut-off having divide-shut brake loop that electric current passes through to cause the problem of damage.
(5) drive circuit of microcomputer protecting device exit relay of the present utility model; when breaker open operation or closing circuit adopt AC power; near alternating voltage zero-crossing point, can make loop produce of short duration current over-zero, cause the closure in short-term of the phototriode of bi-directional light electric coupling.By the charging of filter capacitor, stop pull down resistor fast level to be pulled to low level, thereby avoid because of short duration zero passage makes NOR gate unlocking.
(6) drive circuit of microcomputer protecting device exit relay of the present utility model; current sampling circuit is realized the detection whether breaker open operation or closing circuit have electric current to pass through, and the current conversion in breaker open operation or closing circuit is become to a discernible small voltage.If flow through forward current in the circuit breaker loop, on some diodes of forward series connection, will obtain certain voltage pressure drop, and with the size of electric current, not produce larger variation.In like manner, circuit breaker flows through reverse current in loop, on some diodes of differential concatenation, will obtain certain voltage pressure drop.Current sampling circuit becomes voltage by the current conversion that flows through breaker open operation or closing circuit, and realizes the driving to bi-directional light electric coupling by current-limiting resistance loop.Whether bi-directional light electric coupling has the state of electric current by photoelectricity, to isolate the on off state that converts its sensitization triode to breaker open operation or closing circuit.
(7) drive circuit of microcomputer protecting device exit relay of the present utility model; when breaker open operation or closing circuit adopt AC power; have the positive-negative half-cycle ripple that the current sampling circuit of bidirectional current measuring ability and bi-directional light electric coupling thereof drive loop can realize AC power detects simultaneously; avoid Unidirectional light electric coupling can only detect cycle half, and have the problem of half cycle detection blind area.
Accompanying drawing explanation
For content of the present utility model is more likely to be clearly understood, according to specific embodiment of the utility model also by reference to the accompanying drawings, the utility model is described in further detail, wherein below
Fig. 1 is the wiring schematic diagram that the microcomputer protecting device of the utility model embodiment is controlled circuit-breaker switching on-off.
Fig. 2 is the drive circuit of microcomputer protecting device exit relay of the utility model embodiment 1 application schematic diagram in breaker open operation or closing circuit.
Fig. 3 is the drive circuit of microcomputer protecting device exit relay of the utility model embodiment 2 application schematic diagram in breaker open operation or closing circuit.
Fig. 4 is the drive circuit of microcomputer protecting device exit relay of the utility model embodiment 3 application schematic diagram in breaker open operation or closing circuit.
Embodiment
Fig. 1 shows the wiring schematic diagram of the microcomputer protecting device control circuit-breaker switching on-off of the utility model embodiment.Normally opened contact 111 and the normally opened contact 112 of the exit relay of microcomputer protecting device 100 are connected on respectively in closing circuit of circuit breaker and sub-gate circuit.Microcomputer protecting device 100 sends the order of closing a floodgate, normally opened contact 111 closures of exit relay, closing circuit of circuit breaker conducting, closing coil 221 obtains the electric circuit breaker that makes and carries out closing operation, circuit breaker completes combined floodgate, the auxiliary contacts of circuit breaker 211 that is connected on closing circuit of circuit breaker becomes from closure state the state of cut-offfing, and auxiliary contacts of circuit breaker 212 states that are connected on brake division loop of circuit breaker become closure from cut-offfing, and circuit breaker is prepared separating brake; Microcomputer protecting device 100 sends separating brake order; normally opened contact 112 closures of exit relay; brake division loop of circuit breaker conducting; switching winding 222 obtains the electric circuit breaker that makes and carries out sub-switching operation; circuit breaker completes separating brake; auxiliary contacts of circuit breaker 212 states that are connected on brake division loop of circuit breaker are become and are cut-off from closure, and auxiliary contacts of circuit breaker 211 states that are connected on closing circuit of circuit breaker become closure from cut-offfing, and circuit breaker is prepared to close a floodgate.
Embodiment 1
The application of a kind of drive circuit of microcomputer protecting device exit relay that Fig. 2 shows the utility model embodiment in breaker open operation or closing circuit, this drive circuit comprises logic level converting circuit 130, logic blocking drive circuit 120, current sampling circuit 140.One end of the normally opened contact of the exit relay 110 of microcomputer protecting device is by terminal 231 access breaker open operation or closing circuits; the other end of the normally opened contact of exit relay 110 is connected with one end of current sampling circuit 140, and the other end of current sampling circuit 140 is by terminal 232 access breaker open operation or closing circuits.
Current sampling circuit 140 comprises forward sample circuit in parallel and reverse sample circuit, described forward sample circuit comprises diode D1 and the D2 of two series aiding connections, oppositely sample circuit comprises diode D3 and the D4 of two series aiding connections, the opposite direction of diode in described forward sample circuit and oppositely sample circuit.Current sampling circuit 140 be also connected with a pin of bi-directional light electric coupling Q1 input with the link of normally opened contact exit relay 110, current sampling circuit 140 also by current-limiting resistance R1, be connected with another pin of bi-directional light electric coupling Q1 input with link terminal 232.
Current sampling circuit 140 is realized the detection whether breaker open operation or closing circuit have electric current to pass through, and the current conversion in breaker open operation or closing circuit is become to a discernible small voltage.If flow through forward current in the circuit breaker loop, two diode D1 of forward series connection and D2 is upper will obtain the voltage drop of about 1.4V, and with the size of electric current, do not produce larger variation.In like manner, circuit breaker flows through reverse current in loop, and two of differential concatenation diode D3 and D4 are upper will obtain the voltage drop of about 1.4V equally.Current sampling circuit 140 will flow through the voltage of the current conversion of breaker open operation or closing circuit into about 1.4V, and realizes the driving to bi-directional light electric coupling Q1 by current-limiting resistance R1 loop.Whether bi-directional light electric coupling Q1 has the state of electric current by photoelectricity, to isolate the on off state that converts its sensitization triode to breaker open operation or closing circuit.
When breaker open operation or closing circuit adopt AC power, have the positive-negative half-cycle ripple that the current sampling circuit 140 of bidirectional current measuring ability and bi-directional light electric coupling Q1 thereof drive loop can realize AC power detects simultaneously, avoid Unidirectional light electric coupling can only detect cycle half, and have the problem of half cycle detection blind area.
The input of logic level converting circuit 130 is connected with the output of bi-directional light electric coupling Q1, the output of logic level converting circuit 130 is connected with the input of logic blocking drive circuit 120, and the output of logic blocking drive circuit 120 is connected with the coil of exit relay 110.
The on off state of the sensitization triode of bi-directional light electric coupling Q1 converts logic level signal (low level or high level) to through logic level converting circuit 130.This logic level signal is by after logic blocking drive circuit 120, by logic blocking drive circuit 120 output locking or unlocking signals, to control energising or the off-position of the coil of exit relay 110.When breaker open operation or closing circuit have electric current to pass through, logic blocking drive circuit 120 output block signals, make the coil of exit relay 110 keep "on" position, the normally opened contact of exit relay 110 is closure state, until the electric current flowing through in separating brake or closing circuit is zero, logic blocking drive circuit 120 is exported unlocking signals, and then makes the coil blackout of exit relay 110, and the normally opened contact of exit relay 110 disconnects.Avoid thus the normally opened contact of exit relay 110 in divide-shut brake loop, have electric current by time disconnect and cause damage.
Embodiment 2
The application of a kind of drive circuit of microcomputer protecting device exit relay that Fig. 3 shows the utility model embodiment in breaker open operation or closing circuit.
Logic level converting circuit 130 comprises pull-up resistor R1, filter capacitor C1, one end of pull-up resistor R1 is connected with power supply, the other end of pull-up resistor R1 is connected with the collector electrode pin of bi-directional light electric coupling Q1 output, and filter capacitor C1 is in parallel with two pins of the output of bi-directional light electric coupling Q1; The emitter pin ground connection of bi-directional light electric coupling Q1 output.
Logic blocking drive circuit 120 comprises and door U1; be connected with the collector electrode pin of bi-directional light electric coupling Q1 output with an input of door U1; connecing binding post 121 with another input of door U1 with the control signal of microcomputer protecting device is connected; be connected with the negative link of the output of door U1 and the coil of exit relay 110, the positive terminals of the coil of exit relay 110 are connected with power supply.
Pull-up resistor R1 realizes the logic level transition of on off state of the sensitization triode of bi-directional light electric coupling Q1, and when separating brake or closing circuit have electric current, the switch closed condition of the sensitization triode of bi-directional light electric coupling Q1 is converted into logic low; Otherwise when separating brake or closing circuit no current, the switch open state of the sensitization triode of bi-directional light electric coupling Q1 is converted into logic high.Process and door U1, when separating brake or closing circuit have electric current, all the time by logic low locking, kept output logic low level with door U1, make the coil of exit relay 110 keep "on" position, until separating brake or closing circuit do not have electric current to flow through, the sensitization triode of bi-directional light electric coupling Q1 is opened, this opening is converted into logic high, with door U1 unlocking, determine with the output signal of the door U1 control signal by microcomputer protecting device, be that the control signal of microcomputer protecting device is while being logic high, the coil no power of exit relay 110, normally opened contact disconnects, when the control signal of microcomputer protecting device is logic low, the coil electricity of exit relay 110, normally opened contact is closed, avoids thus the normally opened contact of exit relay 110 to cut-off having divide-shut brake loop that electric current passes through to cause the problem of damage.
When breaker open operation or closing circuit adopt AC power, near alternating voltage zero-crossing point, can make loop produce of short duration current over-zero, cause the closure in short-term of the phototriode of bi-directional light electric coupling Q1.By the charging of filter capacitor C1, stop pull-up resistor R1 fast level to be pulled to high level, thereby avoid because of short duration zero passage makes the unlocking with door U1.
Embodiment 3
Fig. 4 shows the drive circuit of a kind of microcomputer protecting device exit relay of the another embodiment of the utility model.Logic level converting circuit 130 comprises pull down resistor R1, filter capacitor C1, one end ground connection of pull down resistor C1, and the other end of pull down resistor C1 is connected with the pin 3 of bi-directional light electric coupling Q1 output; Filter capacitor C1 is in parallel with pull down resistor R1; The pin 4 of bi-directional light electric coupling Q1 output connects power supply.
Logic blocking drive circuit 120 comprises NOR gate U1; an input of NOR gate U1 is connected with the pin 3 of bi-directional light electric coupling Q1 output; another input of NOR gate U1 connects binding post 121 with the control signal of microcomputer protecting device and is connected; the output of NOR gate U1 is connected with the negative terminals of the coil of exit relay 110, and the negative terminals of the coil of exit relay 110 are connected with power supply.
Pull down resistor R1 realizes the logic level transition of on off state of the sensitization triode of bi-directional light electric coupling Q1, and when separating brake or closing circuit have electric current, the switch closed condition of the sensitization triode of bi-directional light electric coupling Q1 is converted into logic high; Otherwise when separating brake or closing circuit have electric current, the switch open state of the sensitization triode of bi-directional light electric coupling Q1 is converted into logic low.Through NOR gate U1, when separating brake or closing circuit have electric current, NOR gate U1 is kept output logic low level by logic high locking all the time, make the coil of exit relay 110 keep "on" position, until separating brake or closing circuit do not have electric current to flow through, the sensitization triode of bi-directional light electric coupling Q1 is opened, this opening is converted into logic low, NOR gate U1 unlocking, the output signal of NOR gate U1 is determined by the control signal of microcomputer protecting device, be that the control signal of microcomputer protecting device is while being logic high, the coil no power of exit relay 110, normally opened contact disconnects, when the control signal of microcomputer protecting device is logic low, the coil electricity of exit relay 110, normally opened contact is closed, avoids thus the normally opened contact of exit relay 110 to cut-off having divide-shut brake loop that electric current passes through to cause the problem of damage.
When breaker open operation or closing circuit adopt AC power, near alternating voltage zero-crossing point, can make loop produce of short duration current over-zero, cause the closure in short-term of the phototriode of bi-directional light electric coupling Q1.By the charging of filter capacitor C1, stop pull down resistor R1 fast level to be pulled to low level, thereby avoid because of short duration zero passage makes NOR gate U1 unlocking.
As other execution mode, described forward sample circuit can be comprised of single diode, and correspondingly, described reverse sample circuit is also comprised of single diode, the opposite direction of diode in described forward sample circuit and oppositely sample circuit.Certainly, described forward sample circuit can also comprise the diode of two above series aiding connections, correspondingly, described reverse sample circuit also comprises the diode of two above series aiding connections, the opposite direction of diode in described forward sample circuit and oppositely sample circuit.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to execution mode.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all execution modes.And among the protection range that the apparent variation of being extended out thus or change are still created in the utility model.
Claims (7)
1. the drive circuit of a microcomputer protecting device exit relay; comprise the photoelectrical coupler that the current sampling circuit that is connected with the switch block of exit relay and this current sampling circuit drive; it is characterized in that; also comprise logic level converting circuit, logic blocking drive circuit; the input of described logic level converting circuit is connected with the output of photoelectrical coupler; the output of described logic level converting circuit is connected with the input of logic blocking drive circuit, and the output of described logic blocking drive circuit is connected with the coil of described exit relay.
2. the drive circuit of microcomputer protecting device exit relay according to claim 1 described in, it is characterized in that, described logic level converting circuit comprises pull-up resistor, filter capacitor, one end of described pull-up resistor is connected with power supply, and the other end is connected with the collector electrode of the photoinduction triode of described photoelectrical coupler; Described filter capacitor is in parallel with the output of described photoelectrical coupler; The grounded emitter of the photoinduction triode of described photoelectrical coupler.
3. the drive circuit of microcomputer protecting device exit relay according to claim 1 and 2; it is characterized in that; described logic blocking drive circuit comprises and door; described with door an input be connected with the collector electrode of the photoinduction triode of described photoelectrical coupler; described with door another input be connected with the control signal of microcomputer protecting device, described with output be connected with the coil of described exit relay.
4. the drive circuit of microcomputer protecting device exit relay according to claim 1 described in, it is characterized in that, described logic level converting circuit comprises pull down resistor, filter capacitor, one end ground connection of described pull down resistor, the other end is connected with the emitter of the photoinduction triode of described photoelectrical coupler; Described filter capacitor is in parallel with described pull down resistor; The collector electrode of the photoinduction triode of described photoelectrical coupler connects power supply.
5. according to the drive circuit of the microcomputer protecting device exit relay described in claim 1 or 4; it is characterized in that; described logic blocking drive circuit comprises NOR gate; an input of described NOR gate is connected with the emitter of the photoinduction triode of described photoelectrical coupler; another input of described NOR gate is connected with the control signal of microcomputer protecting device, and the output of described NOR gate is connected with the coil of described exit relay.
6. according to the drive circuit of the microcomputer protecting device exit relay described in claim 1 or 2 or 4; it is characterized in that; described current sampling circuit comprises forward sample circuit in parallel and reverse sample circuit; described forward sample circuit and oppositely sample circuit comprise respectively the diode of several series aiding connections, and described forward sample circuit and the reverse opposite direction of diode in sample circuit.
7. the drive circuit of microcomputer protecting device exit relay according to claim 6, is characterized in that, described photoelectrical coupler is bi-directional light electric coupling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420228549.1U CN203800556U (en) | 2014-05-06 | 2014-05-06 | Microcomputer protection device exit relay drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420228549.1U CN203800556U (en) | 2014-05-06 | 2014-05-06 | Microcomputer protection device exit relay drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203800556U true CN203800556U (en) | 2014-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420228549.1U Expired - Lifetime CN203800556U (en) | 2014-05-06 | 2014-05-06 | Microcomputer protection device exit relay drive circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017125056A1 (en) * | 2016-01-24 | 2017-07-27 | 广州市金矢电子有限公司 | Zero-crossing detection apparatus and synchronous switch |
| CN107465175A (en) * | 2016-06-06 | 2017-12-12 | 上海勃继智能科技有限公司 | Prevent the microcomputer protecting device of maloperation |
| CN109324286A (en) * | 2018-09-29 | 2019-02-12 | 国家电网有限公司 | Intelligent multifunction switching device for mechanical characteristic of high-voltage circuit breaker test |
| CN111123695A (en) * | 2019-12-10 | 2020-05-08 | 安徽合凯电气科技股份有限公司 | Interlocking type misoperation prevention control system |
-
2014
- 2014-05-06 CN CN201420228549.1U patent/CN203800556U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017125056A1 (en) * | 2016-01-24 | 2017-07-27 | 广州市金矢电子有限公司 | Zero-crossing detection apparatus and synchronous switch |
| CN107465175A (en) * | 2016-06-06 | 2017-12-12 | 上海勃继智能科技有限公司 | Prevent the microcomputer protecting device of maloperation |
| CN107465175B (en) * | 2016-06-06 | 2019-08-20 | 上海勃继智能科技有限公司 | Prevent the microcomputer protecting device of maloperation |
| CN109324286A (en) * | 2018-09-29 | 2019-02-12 | 国家电网有限公司 | Intelligent multifunction switching device for mechanical characteristic of high-voltage circuit breaker test |
| CN111123695A (en) * | 2019-12-10 | 2020-05-08 | 安徽合凯电气科技股份有限公司 | Interlocking type misoperation prevention control system |
| CN111123695B (en) * | 2019-12-10 | 2022-04-19 | 安徽合凯电气科技股份有限公司 | Interlocking type misoperation prevention control system |
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