CN104502836B - Array-type status detection circuit suitable for internal relay of scanning switch - Google Patents

Array-type status detection circuit suitable for internal relay of scanning switch Download PDF

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Publication number
CN104502836B
CN104502836B CN201410704329.6A CN201410704329A CN104502836B CN 104502836 B CN104502836 B CN 104502836B CN 201410704329 A CN201410704329 A CN 201410704329A CN 104502836 B CN104502836 B CN 104502836B
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China
Prior art keywords
relay
shift register
array
detection circuit
scanning switch
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CN201410704329.6A
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Chinese (zh)
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CN104502836A (en
Inventor
陈乐�
钱璐帅
李正坤
富雅琼
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中国计量学院
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Abstract

The invention discloses an array-type status detection circuit suitable for an internal relay of a scanning switch. The circuit comprises a detected M*N array formed by relay channel units. Signal detection input ends of the relay channel units in the same row are connected in series, and then serve as a row detection end. All the row detection ends are respectively connected to M output ends of a serial-in parallel-out shifting register. Scanning signals of all rows of a controller are inputted to the serial-in parallel-out shifting register. Signal detection output ends of the relay channel units in the same column are connected in series, and then serve as a column detection end. All column detection ends are respectively connected to N input ends of the he serial-in parallel-out shifting register. A feedback signal of the serial-in parallel-out shifting register is connected to the controller. The detection circuit employs a mode of array-type status detection. Compared with the prior art, the detection circuit is low in power consumption, is simple in wiring, is small in interference, and is high in reliability.

Description

Suitable for the array state detection circuit of scanning switch internal relay

Technical field

It is more particularly to a kind of suitable for scanning switch internal relay the present invention relates to a kind of relay test circuit Array state detection circuit.

Background technology

Scanning switch extensively, is particularly suited for standard hot even summation standard platinum resistance, work in metrology and measurement sector application Effect thermocouple and thermal resistance, the measures conversion of DC small signal.Its cardinal principle is by control signal control relay Break-make, to reach the purpose of switch test passage.The actuating of relay rely on driver drives, but multi-channel scanning switch in by It is more in the relay quantity for needing to drive, the malfunction of other relays may be caused when driving and specifying the actuating of relay Make, so relay status must be relied on to detect circuit to guarantee the accuracy of the actuating of relay.As shown in figure 1, current multichannel The conventional magnetic freeze mode relay status detection mode of scanning switch is:Two relays are one group, with two relays of group Sense channel it is parallel with one another.When two relays of relay group are closed, light emitting diode D1Normal luminous.Work as relay When arbitrary relay disconnects in group, light emitting diode D1It is shorted, light emitting diode D1It is unable to normal luminous.With the tunnel of binary channels 16 As a example by four line scanning switch, inside includes 128 magnetic freeze mode relays.Need altogether if being detected in the manner shown in figure 1 The devices such as 64 light emitting diodes and its attached current-limiting resistance are wanted, causes wiring complicated, circuit operating efficiency is relatively low.Work as power supply During connection, no matter how relay status have electric current to flow through current-limiting resistance, so operating current is larger, power consumption is higher.Additionally, Because relay status detection circuit easily causes signal interference with the shared same power supply such as controller, it is unfavorable for system stability work Make.

The content of the invention

Larger to solve foregoing circuit power consumption, line is complicated, and signal is easily disturbed to wait not enough, the invention provides a kind of suitable For the array state detection circuit of scanning switch internal relay.

The present invention the taken technical scheme that solves the above problems is:

The present invention includes being formed the tested array of M rows × N row, being sealed in and gone out shift LD by relay channel unit array Device and being incorporated to goes here and there out shift register;Detection signal input positioned at all relay channel units of same a line is connected in series Afterwards as row test side, each row test side is connected respectively to respectively in the M roads output end of SI PO shift register, control The progressive-scan signal of device output end is input in the input of SI PO shift register;Positioned at all relays of same row The detection signal output end of device channel unit is connected in series as row test side, and each row test side is connected respectively to be incorporated to respectively Go here and there out on the N roads input of shift register, be incorporated to go here and there out shift register output end output feedback signal be connected to control Device input.

Described relay channel unit be by least one relay group into.

Described relay channel unit by a relay group into:One movable contact exit of relay is used as detection Signal input part, the stationary contact exit positioned at the movable contact exit the same side is used as detection signal output end;Or, after One movable contact exit of electrical equipment is drawn as detection signal output end, the stationary contact positioned at the movable contact exit the same side End is used as detection signal input.

Described relay channel unit is by including at least two multiple relay groups into the to be checked of, multiple relays Survey passage to be sequentially connected in series, be located therein the stationary contact exit of a relay of one end as detection signal input, be located at Used as detection signal output end, the winding of relay is high-end, winding low side for the stationary contact exit of one relay of the other end As actuating of relay control end.

Described relay is the ordinary electromagnetic relay of open type, closed type or conversion hysteria or magnetic freeze mode relay Device.

Described serial-in parallel-out register is CMOS-type or TTL types with simultaneously series-in-series-out register.

Described controller is powered with SI PO shift register using different electrical power, seals in and go out shift LD Device and being incorporated to is gone here and there out shift register and is powered using same power supplies.

One is respectively serially connected between described serial-in parallel-out register and controller and between series-in-series-out register and controller Individual isolation optocoupler.

Its advantage of the present invention is:

Using the present invention, for the magnetic freeze mode relay for detecting multiple quantity only needs to a SI PO shift register It is incorporated to one and goes here and there out shift register, greatly reduces cost with wiring difficulty.

The present invention is when relay status detection circuit works, and operating current is little, low in energy consumption.In relay status detection electricity When road does not work, relay status detection circuit power can be closed, realize lower power consumption and zero interference.

The present invention realizes that controller and relay status detect the electrical isolation between circuit by optocoupler, increases system stability Property.

Description of the drawings

Fig. 1 detects electrical block diagram for traditional existing scanning switch magnetic freeze mode relay status.

Fig. 2 is the connection diagram that invention relay channel unit is made up of ordinary electromagnetic relay.

Fig. 3 is the connection diagram that invention relay channel unit is made up of magnetic freeze mode relay.

Fig. 4 is the attachment structure schematic diagram of circuit of the present invention.

Fig. 5 is embodiment of the present invention relay channel unit array structure schematic diagram.

In figure:1st, controller, 2, isolation optocoupler, 3, SI PO shift register, 4, row test side, 5, tested array, 6th, test side is arranged, 7 and goes out to seal in shift register, 8, relay status detection circuit power, 9, controller power source, 10, detection Signal input part, 11, detection signal output end, 12, movable contact exit, 13, stationary contact exit.

Specific embodiment

With reference to the accompanying drawings and examples the invention will be further described.

As shown in figure 4, the present invention includes being formed the tested array 5 of M rows × N row, being sealed in by relay channel unit array And go out shift register 3 and being incorporated to and go here and there out shift register 7;Positioned at the detection signal of all relay channel units of same a line Input 10 is distinguished after being connected in series as row test side 4, each row test side 4 positioned at the relay channel unit of different rows It is connected respectively in the M roads output end of SI PO shift register 3, the progressive-scan signal that the output end of controller 1 is produced is defeated Enter in the input of SI PO shift register 3;Detection signal positioned at all relay channel units of same row is defeated Go out end 11 to be connected in series as row test side 6, each row test side 6 positioned at the relay channel unit of different lines is respective respectively Be connected to be incorporated to go here and there out shift register 7 N roads input on, be incorporated to go here and there out the output end of shift register 7 output feedback letter Number it is connected to the input of controller 1.

As shown in figure 4, several relay channel units rearrange M rows × N row types array 5 by array way, wherein I row (1=<I<=M) all relay channel units detection signal input 10 be connected to positioned at a line I rows examine Survey end 4;J arranges (1=<J<=N) the detection signal output end 11 of all relay channel units be connected to positioned at same row J row test side 6.The progressive-scan signal that controller 1 is produced is connected with SI PO shift register 3, seals in and go out displacement The M roads output end of register 3 is corresponded with the M roads row test side 4 of tested array 5 and is connected, the N roads row detection of tested array 5 The feedback signal at end 6 is gone here and there out the N roads input of shift register 7 and corresponds and be connected with being incorporated to, and is incorporated to and is gone here and there out shift register 7 Feedback signal output be connected with controller 1.

Above-mentioned relay channel unit be by one or more relay group into.

Relay channel unit can by a relay group into:One movable contact exit 12 of relay is used as detection letter Number input 10, the stationary contact exit 13 positioned at the same side of movable contact exit 12 is used as detection signal output end 11;Or Person is that a movable contact exit 12 of relay is same positioned at the movable contact exit 12 as detection signal output end 11 The stationary contact exit 13 of side is used as detection signal input 10.

Relay channel unit also can be by including at least two multiple relay groups into multiple relays are logical with signal The mode in road is sequentially connected in series, and is located therein the stationary contact exit 13 of a relay of one end as detection signal input 10, positioned at the other end a relay stationary contact exit 13 as detection signal output end 11, the winding of relay is high End, winding low side are used as actuating of relay control end.

For example shown in Fig. 2 or Fig. 3, preferred relay channel unit is by two relay groups into two relays Movable contact exit 12 is connected, the stationary contact exit 13 of one of relay as detection signal input 10, another Used as detection signal output end 11, Fig. 2 is the relay that two ordinary electromagnetic relays are constituted to the stationary contact exit 13 of relay Device channel unit, Fig. 3 is the relay channel unit that two magnetic freeze mode relays are constituted.

Relay is the ordinary electromagnetic relay of open type, closed type or conversion hysteria or magnetic freeze mode relay.

Serial-in parallel-out register 3 is CMOS-type or TTL types with simultaneously series-in-series-out register 7.

Controller 1 is powered with SI PO shift register 3 using different electrical power, SI PO shift register 3 Go here and there out shift register 7 and be powered using same power supplies with being incorporated to.Relay status detection circuit power 8 is to seal in and goes out to move Bit register 3 and being incorporated to is gone here and there out shift register 7 and is powered, and controller power source 9 is powered for controller 1, controller power source 9 and relay Device state detection circuit power supply 8 is separate, and relay status detection circuit power 8 can be closed individually.

One is respectively serially connected between serial-in parallel-out register 3 and controller 1 and between series-in-series-out register 7 and controller 1 Isolation optocoupler 2, to reduce electrical Interference.

The operation principle of the present invention is as follows:

The present invention relay channel unit is linked together using array by the way of, by progressive scan in the way of detect after Electrical appliance state.By taking the first row relay status detection in Fig. 4 as an example, controller produces serial progressive-scan signal, through sealing in And go out after shift register, it is converted into parallel signal.It is now logical signal " 1 " on the 1st row test side, other row test sides Upper is logical signal " 0 ".If two relays of a certain relay channel unit are closed in the first row relay, then should The corresponding row test side output logic signal " 1 " of relay channel unit, and with other relay channel unit correspondences in a line The equal output logic signal in row test side " 0 ".Be incorporated to go here and there out shift register by each row test side signal be converted into serial Data feedback is detected to controller so as to complete single file relay status.In the same manner, the relay status detection of other rows is similar Seemingly.After the relay status detection of all rows is finished, the data that controller was obtained according to before judge whether relay has Misoperation.If feedback result is inconsistent with expected results, all relays that reset are needed, respective channel is re-closed afterwards Relay, detect again, till the result of the action is correct.Thus assure that the accuracy that passage switches.This outer controller Power supply is separate with relay status detection circuit power, and when relay status detection circuit works, operating current is little, work( Consumption is low.When relay status detection circuit does not work, relay status detection circuit power can be closed, realize lower power consumption With zero interference.

Embodiments of the invention and its it is embodied as the course of work:

By taking the line scanning switch of 16 tunnel of binary channels four as an example, the scanning switch includes controller, isolation optocoupler, seals in and goes out to move Bit register, it is incorporated to and goes here and there out shift register, relay array and power management module.Wherein controller is given birth to from STC Corporation The IAP15F2K61S2 type single-chip microcomputers of product;Relay is kept from the TX2-L2-5V type twin coils magnetic of MAT's production Formula relay;The Bits Serial of CD74HC164 high-speed cmos logic 8 input that SI PO shift register is produced from TI companies/ Parallel output shift register;Be incorporated to go here and there out shift register from TI companies production CD74HC165 high-speed cmos logic 8 Parallel input/Serial output shift register;TLP521-4 type four tunnel independence of the isolation optocoupler from Toshiba Corp's production Optocoupler.Controller power source managing chip detects circuit power managing chip from the production of TI companies with relay status TPS7A4901 linear voltage regulators;Scanning switch is powered using 6V DC voltage adaptor devices.

Scanning switch possesses two output channels and is respectively passage A and passage B, and 16 input channels are respectively passage 1 ~ logical Road 16, each passage includes 4 threads.As a example by switch to A1 passages, by control relay break-make so that passage A with Four thread mutual conductions of passage 1, and other A paths are not turned on.Due to the total A1 ~ A16 of passage switching, B1 ~ B16 amounts to 32 selection, so need 128 magnetic freeze mode relays, each actuating of relay be required for after finishing detection this 128 after The state of electrical equipment.From twin coil magnetic freeze mode relay inside comprising two independent switches in left and right, and two independent switches Action be synchronous.So using a wherein way switch as scanning switch signalling channel, another road is used as sense channel.Should Four relay control logics for belonging to same passage in scanning switch are identical, here two of which connect into four-wire ohm voltage high The relay group of low side into a relay channel unit by two other connect the relay group of the high low side of four-wire ohm electric current into Another relay channel unit.In this manner it is achieved that 128 relays constitute altogether 64 relay channel units.With one Relay channel unit is least unit, and the relay channel unit array of 8 row × 8 row is arranged in the way of Fig. 5.Should The relay unit array of 8 row × 8 row possesses 8 row detection ports, 8 row detection ports.

Relay implement body detection mode is as follows:As a example by switch to A1 passages, corresponding two relay units of A1 passages It is respectively connecting to the 1st row test side, the 1st row control end and the 1st row test side, the 2nd row control end.Using progressive scan during detection Form carry out.The first row relay channel unit is detected first, controller exports 8 bit string every trade detection signals 01111111, because optocoupler is for the acting in opposition of logic level so that the input signal of SI PO shift register is 10000000.It is logical signal " 1 " on the 1st row test side after SI PO shift register, is on other row test sides Logical signal " 0 ".So when corresponding two relay units of A1 passages are closed, will be in the 1st row test side and the 2nd row inspection Survey end output logic signal " 1 ", and the equal output logic signal " 0 " in the corresponding row test side of other relay channel units.It is incorporated to The signal of 8 row test sides is converted into serial data 11000000 and feeds back to controller by shift register of going here and there out, so as to complete Single file relay status are detected.In the same manner, the relay status detection of other rows is similar.When the relay status of all rows are detected After finishing, the data that controller was obtained according to before judge whether relay has misoperation.As a example by switch to A1 passages, after The 8 groups of serial datas fed back in the case of electrical equipment action is correct should be respectively 11000000,00000000,00000000, 00000000、00000000、00000000、00000000、00000000.If feedback result is inconsistent with the above results, All relays that reset are needed, the relay of respective channel is re-closed afterwards, detected again, until the result of the action is correctly Only.Thus assure that the accuracy that passage switches.

Closed mode detection circuit power after relay status detection is finished, to reduce energy consumption with interference.Actual test , the maximum instantaneous electric current of the line scanning switch of 16 tunnel of binary channels four is 0.5A, and maximum instantaneous power consumption is 3.5W, after detection is finished, Instrument enters standby mode, stand-by power consumption 0.4W.

Thus, present invention achieves the detection of 128 relays in the line scanning switch of 16 tunnel of binary channels four inside only needs to one Piece SI PO shift register and a piece of being incorporated to go here and there out shift register, greatly reduce cost with wiring difficulty, operating current It is little, it is low in energy consumption, with the significant technique effect of protrusion.

Above-mentioned specific embodiment is used for illustrating the present invention, rather than limits the invention, in the essence of the present invention In god and scope of the claims, any modifications and changes made to the present invention both fall within protection scope of the present invention.

Claims (8)

1. a kind of array state detection circuit suitable for scanning switch internal relay, it is characterised in that:Including by relay Device channel unit array forms the tested array of M rows × N row(5), SI PO shift register(3)Go here and there out displacement and post with being incorporated to Storage(7);
Positioned at the detection signal input of all relay channel units of same a line(10)As row test side after being connected in series (4), each row test side(4)SI PO shift register is connected respectively to respectively(3)M roads output end on, controller(1) The progressive-scan signal of output end is input to SI PO shift register(3)Input in;Positioned at same row it is all after The detection signal output end of electrical equipment channel unit(11)It is connected in series as row test side(6), each row test side(6)It is each respectively Shift register is gone here and there out from being connected to be incorporated to(7)N roads input on, be incorporated to and go here and there out shift register(7)Output end output Feedback signal is connected to controller(1)Input.
2. a kind of array state detection circuit suitable for scanning switch internal relay according to claim 1, its It is characterised by:Described relay channel unit be by least one relay group into.
3. a kind of array state detection circuit suitable for scanning switch internal relay according to claim 2, its It is characterised by:Described relay channel unit by a relay group into:One movable contact exit of relay(12)Make For detection signal input(10), positioned at the movable contact exit(12)The stationary contact exit of the same side(13)As detection letter Number output end(11);Or, a movable contact exit of relay(12)As detection signal output end(11), positioned at this Movable contact exit(12)The stationary contact exit of the same side(13)As detection signal input(10).
4. a kind of array state detection circuit suitable for scanning switch internal relay according to claim 2, its It is characterised by:Described relay channel unit is by including at least two multiple relay groups treating into, multiple relays Sense channel is sequentially connected in series, and is located therein the stationary contact exit of a relay of one end(13)As detection signal input (10), positioned at the stationary contact exit of a relay of the other end(13)As detection signal output end(11), relay Winding is high-end and winding low side is used as actuating of relay control end.
5. according to a kind of arbitrary described array state-detection suitable for scanning switch internal relay of Claims 1 to 4 Circuit, it is characterised in that:Described relay is that the ordinary electromagnetic relay of open type, closed type or conversion hysteria or magnetic keep Formula relay.
6. a kind of array state detection circuit suitable for scanning switch internal relay according to claim 1, its It is characterised by:Described SI PO shift register(3)Shift register is gone here and there out with being incorporated to(7)For CMOS-type or TTL types.
7. a kind of array state detection circuit suitable for scanning switch internal relay according to claim 1, its It is characterised by:Described controller(1)With SI PO shift register(3)It is powered using different electrical power, seals in and go out Shift register(3)Shift register is gone here and there out with being incorporated to(7)It is powered using same power supplies.
8. a kind of array state detection circuit suitable for scanning switch internal relay according to claim 1, its It is characterised by:Described SI PO shift register(3)With controller(1)Between, be incorporated to and go here and there out shift register(7)With control Device processed(1)Between be respectively serially connected with an isolation optocoupler(2).
CN201410704329.6A 2014-11-30 2014-11-30 Array-type status detection circuit suitable for internal relay of scanning switch CN104502836B (en)

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CN109901062A (en) * 2019-02-22 2019-06-18 山东欧德利电气设备有限公司 A kind of circuit for realizing key detection by MCU controller

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CN202111685U (en) * 2011-05-23 2012-01-11 博世汽车部件(苏州)有限公司 Extensible switch matrix plate
CN102354193A (en) * 2011-09-08 2012-02-15 山东科汇电力自动化有限公司 Switching signal acquisition method
CN103809051A (en) * 2012-11-13 2014-05-21 上海斐讯数据通信技术有限公司 Automatic test system and switch matrix and detection method thereof in automatic test system
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