CN104079280B - A kind of solid-state relay of high withstand voltage - Google Patents
A kind of solid-state relay of high withstand voltage Download PDFInfo
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- CN104079280B CN104079280B CN201410312699.5A CN201410312699A CN104079280B CN 104079280 B CN104079280 B CN 104079280B CN 201410312699 A CN201410312699 A CN 201410312699A CN 104079280 B CN104079280 B CN 104079280B
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Abstract
The present invention relates to a kind of solid-state relay, particularly a kind of solid-state relay of optocoupler control.The invention discloses a kind of solid-state relay with high withstand voltage, including input circuit in sequential series（21）, photoelectric coupled circuit（22）, output switch circuit（23）；Wherein photoelectric coupled circuit（22）By two optic coupling elements（P1 and P2）, output switch circuit（23）By two one-way SCRs（T1 and T2）Composition.The solid-state relay with high withstand voltage of the present invention is used for the electronic switch of driving power device, and the conducting and disconnection of high power load are controlled with the tiny signal of milliampere level.
Description
Technical field
The present invention relates to a kind of solid-state relay, particularly a kind of solid-state relay of optocoupler control.
Background technology
Solid-state relay is a kind of using controllable silicon, metal-oxide-semiconductor, IGBT constant powers device as switch, with optocoupler or electromagnetism
Electronic switch of the disconnecting switch such as relay as driving power device, high power load is controlled with the tiny signal of milliampere level
Conducting and disconnection.In the design of conventional solid-state relay, its optocoupler part typically uses bidirectional triode thyristor to realize
To a kind of double-lamp indicating solid-state relay pointed out in the two-way admittance of alternating current, such as the A of patent of invention CN 102594319,
Use the form of two optocouplers series connection in optocoupler trigger control circuit, wherein used in optocoupler it is two-way can
Control the optocoupler of silicon type.But due to the optocoupler of bidirectional triode thyristor type, it is limited to the property of the volume and bidirectional triode thyristor of optocoupler in itself
Can, the voltage endurance capability of optocoupler and antijamming capability specific power device it is low, the peak performance of power device can not be played, it is necessary to
Lowest performance according to optocoupler carrys out design work circuit.When there is surge at work, in AC power in solid-state relay
（Instantaneous large-current, moment big voltage）, and more than the maximum voltage climbing that can bear or current-rising-rate of optocoupler, light
Coupling easily fails straight-through.The pressure-resistant up to 800V of bidirectional triode thyristor type optocoupler in the market, can be fitted for conventional environment
With, but because the optocoupler of the bidirectional triode thyristor type in trigger control circuit is pressure-resistant and anti-interference energy in the environment of inclement condition
The deficiency of power, easily make bidirectional triode thyristor failure inside optocoupler straight-through under surge, and cause (PCC) power controllable silicon false touch
Hair, so as to trigger serious security incident.The solid-state relay in firing equipment is such as applied to make to add after above-mentioned failure occurs
Hot equipment continuous heating and finally because crossing cause thermal damage, serious will also trigger fire；When applying in electric machinery load, motor
Start work suddenly, will also trigger various security incidents.
In order to improve the voltage endurance capability of solid-state relay, it has been proposed that lift solid-state relay using various improvement circuits
The measure of device voltage endurance capability.Such as a kind of buffering electricity of solid-state relay output end is proposed in the A of patent of invention CN 103095262
Road, it can protect solid-state relay is not breakdown when running into surge to burn out by buffer circuit.But this buffer circuit
Design add the complexity of circuit design and be unfavorable for carrying out upgrading on the basis of conventional solid-state relay circuit changing
Enter.
The content of the invention
For above-mentioned prior art, present invention solves the technical problem that being to provide a kind of optocoupler with one-way SCR type
High voltage bearing solid-state relay as trigger control circuit.
To solve the above problems, the solid-state relay of the present invention includes：Input circuit, touched according to the actual needs to optocoupler
Send out control circuit and necessary trigger signal is provided；Optocoupler trigger control circuit, the trigger signal from input circuit is received, according to
The type of the trigger signal received judges the conducting state of optocoupler trigger control circuit, unidirectional control output switch circuit
Conducting and disconnection；Output switch circuit, it is connected with load equipment, controls the conducting and disconnection of load circuit；Described optocoupler
Trigger control circuit is made up of two optocouplers P1 and P2；Optocoupler in described optocoupler trigger control circuit is by lighting
Diode and photosensitive one-way SCR are formed；Two light emitting diodes in described optocoupler P1 and P2 are connected on input electricity
Lu Zhong；Two photosensitive one-way SCR devices in described optocoupler P1 and P2 are connected in antiparallel, in optocoupler P1
Photosensitive one-way SCR negative electrode and resistance R5 connect after one-way SCR T2 gate pole be connected, it is photosensitive in optocoupler P2
The negative electrode of one-way SCR is connected with one-way SCR T1 gate pole, or resistance R5 is serially connected in photosensitive in optocoupler P2
On the connecting line that the negative electrode of one-way SCR is connected with one-way SCR T1 gate pole；Described output switch circuit is by two lists
Formed to controllable silicon；Described two one-way SCR T1 and T2 reverse parallel connections and lead-out wire are to after output end O1 and output end O2
With load in series.
In the above-mentioned technical solutions, the bidirectional triode thyristor optocoupler in traditional optocoupler trigger control circuit is substituted for
One-way SCR optocoupler, this replacement can make the pressure-resistant degree of traditional relay bring up to more than 1000V.Optocoupler
Device P1 conducting control one-way SCR T2 conducting, optocoupler P2 conducting control one-way SCR T1 conducting, by
In one-way SCR T1 and one-way SCR T2 to be connected in antiparallel, corresponding to positive and negative two half-waves of the alternating current of load end
One-way SCR T1 and one-way SCR T2 realizes the difference state of one cut-off of a conducting during cycle, realizes the biography of alternating current
It is defeated.Meanwhile traditional bidirectional triode thyristor type photoelectric coupled circuit is improved to the one-way SCR type photoelectric coupled circuit of this high withstand voltage only
Traditional bidirectional triode thyristor optocoupler need to be replaced with to one-way SCR optocoupler, while existing optocoupler technique can
One-way SCR optocoupler is made, and technology need not be carried out and assaulted fortified position, and this improvement need not increase extra circuit and only need
Change the cabling of traditional circuit with regard to this effect can be reached, save cost.
As a further improvement on the present invention, can increase in described output switch circuit 23 in one-way SCR T1 anti-
False touch Power Generation Road 231, increase anti-error triggers circuit 232 on one-way SCR T2；Described anti-error triggers circuit 231 is by one two
Pole pipe D3 and a resistance R3 are composed in parallel, described anti-error triggers circuit 232 by an a diode D4 and resistance R4 simultaneously
Connection composition；The anti-error triggers circuit 231 told is connected in parallel between one-way SCR T1 negative electrode and gate pole, diode D3 negative electrode with
One-way SCR T1 gate pole is connected, and diode D3 anode is connected with one-way SCR T2 negative electrode；The anti-error triggering told
Circuit 232 is connected in parallel between one-way SCR T2 negative electrode and gate pole, diode D4 negative electrode and one-way SCR T2 gate pole phase
Even, diode D4 anode is connected with one-way SCR T2 negative electrode.It can be prevented by way of increasing anti-error triggers circuit
The possibility of false triggering occurs for one-way SCR T1 and one-way SCR T2 in output circuit.
As a further improvement on the present invention, the end of a described output circuit 23 resistance-capacitance absorption loop 233 in parallel.
Described resistance-capacitance absorption loop 233 is made up of piezo-resistance V1 in parallel after electric capacity C1 series resistances R6.Pass through this connected mode
The survival ability of one-way SCR T1 and one-way SCR T2 under surge can be improved.
As a further improvement on the present invention, an indicating circuit 211 is increased in described input circuit 21；Described finger
Show that circuit is made up of current-limiting resistance R2 and light emitting diode D2；Two are connected in parallel on after current-limiting resistance R2 is connected with light emitting diode D2
At pole pipe D1 and current-limiting resistance R1 node.Luminous by light emitting diode D2 indicates the conducting of optocoupler trigger control circuit
State.
As a further improvement on the present invention, one diode of positive series connection on the input of described input circuit 21
D1, when input signal is reversely excessive light emitting diode can be protected not breakdown.
Brief description of the drawings
Fig. 1 is the electrical block diagram of the first embodiment of the invention.
Fig. 2 is the electrical block diagram of second of embodiment of the invention.
Fig. 3 is the electrical block diagram of the third embodiment of the invention.
Fig. 4 is the electrical block diagram of the 4th kind of embodiment of the invention.
Fig. 5 is the electrical block diagram of the 5th kind of embodiment of the invention.
Fig. 6 is the electrical block diagram of the 6th kind of embodiment of the invention.
Fig. 7 is the electrical block diagram of the 7th kind of embodiment of the invention.
Fig. 8 is the electrical block diagram of the 8th kind of embodiment of the invention.
Embodiment
In conjunction with the drawings and specific embodiments, the present invention is further described.
Embodiment 1：
The first embodiment of the solid-state relay of the present invention is as shown in figure 1, including input circuit 21, optocoupler triggering control
Circuit 22 processed, output switch circuit 23.
Input circuit 21 receives input control signal, the trigger signal needed for output control optocoupler trigger control circuit.
It is used for controlling the conducting and disconnection of optocoupler trigger control circuit according to the difference of input trigger signal.Input circuit 21 is in input
Output end on I1 or input I2 after one current-limiting resistance R1 of series connection as input circuit 21 controls with the triggering of next stage optocoupler
The input connection of circuit 22.
Optocoupler trigger control circuit 22 is made up of two optocouplers P1, P2.The triggering provided according to input circuit 21 is believed
Number type, optocoupler trigger control circuit 22 it is unidirectionally controlled the conducting and disconnection of output switch circuit 23.Described optocoupler
All include a light emitting diode and a photosensitive one-way SCR device in P1 and P2.It is luminous in wherein optocoupler P1
Diode be connected in series with the light emitting diode in optocoupler P2 after as optocoupler trigger control circuit 22 input with it is defeated
Enter the output end series connection of circuit 21.Photosensitive one-way SCR in optocoupler P1 with it is photosensitive unidirectional controllable in optocoupler P2
Silicon reverse parallel connection, and two connecting lines are drawn as optocoupler trigger control circuit from the negative electrode of two photosensitive one-way SCRs respectively
22 output end connection next stage output switch circuit 23.
Output switch circuit 23 is made up of two one-way SCR T1 and T2 and resistance R5.One-way SCR T1 is with unidirectionally may be used
Control silicon T2 reverse parallel connections, one-way SCR T1 and one-way SCR T2 gate leve draw two lines as output switch circuit respectively
23 input is connected with the output end of optocoupler trigger control circuit 22.One-way SCR T1 and one-way SCR T2 reverse parallel connections
And from output end O1 and output end O2 end of two end points as output switch circuit 23 of parallel connection, for load equipment phase
Even.The negative electrode of photosensitive one-way SCR in optocoupler P1 is connected after being connected with resistance R5 with one-way SCR T2 gate pole,
The negative electrode of photosensitive one-way SCR in optocoupler P2 is connected with one-way SCR T1 gate pole；Or resistance R5 is serially connected in
On the connecting line that the negative electrode of photosensitive one-way SCR in optocoupler P2 is connected with one-way SCR T1 gate pole.It is unidirectional controllable
When silicon T1 and one-way SCR T2 reverse parallel connections are to be able to make the load end use alternating current, one-way SCR T1 is with unidirectionally may be used
Control silicon T2 can be respectively turned in the positive half cycle and negative half period of alternating current respectively, realize the transmission of alternating current.
When input circuit input high level makes the conducting of optocoupler trigger control circuit and output circuit O1 ends alternating current be just half
Zhou Shi, optocoupler P1 lumination of light emitting diode make the gate pole of the photosensitive one-way SCR in optocoupler P1 absorb at luminous energy
In high potential, output end O1, which is in the positive half cycle of exchange, makes the anode potential of the photosensitive one-way SCR in optocoupler P1 be higher than the moon
Electrode potential, the anode potential of the photosensitive one-way SCR in optocoupler P2 is less than cathode potential, so now optocoupler P1
Conducting, optocoupler P2 cut-offs.Because optocoupler P1 conducting causes one-way SCR T2 gate potentials higher than negative electrode electricity
Position, and output end O1 is in the positive half cycle of alternating current and causes one-way SCR T2 anode potential to be higher than cathode potential, so now
One-way SCR T2 is turned on.Because one-way SCR T1 anode potential is less than cathode potential, so now one-way SCR T1
Cut-off.
When input circuit input high level makes the conducting of optocoupler trigger control circuit and output circuit O2 ends alternating current be just half
Zhou Shi, optocoupler P2 lumination of light emitting diode make the gate pole of the photosensitive one-way SCR in optocoupler P2 absorb at luminous energy
In high potential, output end O2, which is in the positive half cycle of alternating current, is higher than the anode potential of the photosensitive one-way SCR in optocoupler P2
Cathode potential, the anode potential of the photosensitive one-way SCR in optocoupler P1 is less than cathode potential, so now optocoupler
P2 is turned on, optocoupler P1 cut-offs.Because optocoupler P2 conducting causes one-way SCR T1 gate potentials to be higher than negative electrode
Current potential, and output end O2 is in the positive half cycle of alternating current and causes one-way SCR T1 anode potential to be higher than cathode potential, so this
When one-way SCR T2 conducting.Because one-way SCR T2 anode potential is less than cathode potential, so now one-way SCR
T2 ends.
When input circuit input low level disconnects optocoupler trigger control circuit, in optocoupler P1 and optocoupler P2
The gate pole of photosensitive one-way SCR can not all absorb luminous energy and be in high potential, now during the load input of output circuit, unidirectionally
Two conditions that controllable silicon T1 turns on one-way SCR T2：Gate pole has trigger current to pass through；Anode potential is higher than cathode potential,
If can not meet simultaneously, one-way SCR T1 and one-way SCR T2 can not be turned on, and output circuit is off.
By controlling the break-make of optocoupler trigger control circuit as described above with regard to the break-make of output switch circuit can be controlled, simultaneously
Output switch circuit can meet the transmission requirement that load end is alternating current.
Embodiment 2：
Preferably, as shown in Fig. 2 as a further improvement on the present invention, the solid-state relay circuit structure of embodiment 1
It can increase anti-error triggers circuit 231 in one-way SCR T1 in output switch circuit 23, increase on one-way SCR T2 anti-error
Triggers circuit 232；Described anti-error triggers circuit 231 is composed in parallel by a diode D3 and a resistance R3, and described is anti-
False touch Power Generation Road 232 is composed in parallel by a diode D4 and a resistance R4；Described anti-error triggers circuit 231 is connected in parallel on list
To between controllable silicon T1 negative electrode and gate pole, diode D3 negative electrode is connected with one-way SCR T1 gate pole, diode D3 sun
Pole is connected with one-way SCR T2 negative electrode；Described anti-error triggers circuit 232 is connected in parallel on one-way SCR T2 negative electrode and door
Between level, diode D4 negative electrode is connected with one-way SCR T2 gate pole, diode D4 anode and one-way SCR T2 the moon
Extremely it is connected.One-way SCR T1 and the one-way SCR in output circuit can be prevented by way of increasing anti-error triggers circuit
The possibility of false triggering occurs for T2；In input I1 or input I2 one diode D1 of series connection of input circuit 21, it is connected
Direction is identical with the light emitting diode in optocoupler, can be protected when input signal is reversely excessive luminous two in optocoupler
Pole pipe is not reversed breakdown.
Embodiment 3：
Preferably, as shown in figure 3, as a further improvement on the present invention, original solid-state relay of embodiment 1
On between the output end O1 and output end O2 of output switch circuit 23 a resistance-capacitance absorption loop 233 in parallel.Described capacitance-resistance is inhaled
Road 233 is withdrawn to be made up of piezo-resistance V1 in parallel after electric capacity C1 series resistances R6.It can be improved unidirectionally by this connected mode
The survival ability of controllable silicon T1 and one-way SCR T2 under surge.
Embodiment 4：
Preferably, as shown in figure 4, as a further improvement on the present invention, original solid-state relay of embodiment 1
Increase an indicating circuit 211 in upper input circuit 21；Described indicating circuit is made up of current-limiting resistance R2 and light emitting diode；
The both ends of input circuit 21 in parallel after current-limiting resistance R2 is connected with light emitting diode D2.Pass through light emitting diode D2 luminous finger
Show the conducting state of optocoupler trigger control circuit.
Embodiment 5：
Preferably, as shown in figure 5, as a further improvement on the present invention, on the solid-state relay of embodiment 1 simultaneously
Increase anti-triggers circuit 231, anti-error triggers circuit 232 and resistance-capacitance absorption loop 233.
Embodiment 6：
Preferably, as shown in fig. 6, as a further improvement on the present invention, on the solid-state relay of embodiment 1 simultaneously
Increase anti-triggers circuit 231, anti-error triggers circuit 232 and indicating circuit 211.
Embodiment 7：
Preferably, as shown in fig. 7, as a further improvement on the present invention, on the solid-state relay of embodiment 1 simultaneously
Increase indicating circuit 211 and resistance-capacitance absorption loop 233.
Embodiment 8：
Preferably, as shown in figure 8, as a further improvement on the present invention, on the solid-state relay of embodiment 1 simultaneously
Increase anti-triggers circuit 231, anti-error triggers circuit 232, resistance-capacitance absorption loop 233 and indicating circuit 211.
The circuit form of input circuit and output switch circuit in 8 embodiments enumerated above removes above-described embodiment
In structure outside can also have the design methods of other forms, for example input circuit can use bridge rectifier etc., output
On-off circuit can increase output switch conducting indicating circuit, the method that one-way SCR gate pole protection circuit uses series inductance
Deng.
By above-mentioned means, the voltage endurance capability of solid-state relay is preferably improved, this circuit design structure is simple, and
And by traditional solid-state relay circuit is carried out simple circuit trace improve can be achieved with this high voltage bearing solid-state after
Electrical Appliances Designing, improving cost is saved.And preferred embodiment can further improve the performance of solid-state relay.
Although specifically showing and describing the present invention with reference to preferred embodiment, those skilled in the art should be bright
In vain, do not departing from the spirit and scope of the present invention that appended claims are limited, in the form and details can be right
The present invention makes a variety of changes, and is protection scope of the present invention.
Claims (9)
1. a kind of solid-state relay with high withstand voltage, including：Input circuit（21）, optocoupler trigger control circuit（22）And output
On-off circuit（23）；It is characterized in that：
Input circuit（21）Input circuit is used as after one current-limiting resistance R1 of series connection（21）Output end and optocoupler triggering control electricity
Road（22）Input be connected in series；
Optocoupler trigger control circuit（22）Including optocoupler P1, P2, optocoupler P1, P2 be by a light emitting diode and
One photosensitive one-way SCR is formed, and the light emitting diode in optocoupler P1 is connected with the light emitting diode in optocoupler P2
Optocoupler trigger control circuit is used as afterwards（22）Input, photosensitive one-way SCR in optocoupler P1 with optocoupler P2
Photosensitive one-way SCR reverse parallel connection after two nodes respectively as optocoupler trigger control circuit（22）Two output ends,
Unidirectional triggering output switch circuit（23）Conducting and cut-off;
Described output switch circuit（23）It is made up of one-way SCR T1, one-way SCR T2 and resistance R5, wherein unidirectionally may be used
Silicon T1 and one-way SCR T2 reverse parallel connections are controlled, as the switch of concatenation to load circuit, one-way SCR T1 and unidirectional controllable
Silicon T2 gate pole is connected to the optocoupler trigger control circuit（22）Two output ends, resistance R5 is connected on one-way SCR
T1 and one-way SCR T2 gate pole and the optocoupler trigger control circuit（22）Two output ends it is any on the way.
2. solid-state relay according to claim 1, it is characterised in that：In described output switch circuit（23）In it is unidirectional can
An anti-error triggers circuit in parallel is distinguished between control silicon T1 and one-way SCR T2 gate pole and negative electrode（231、232）；Described is anti-
False touch Power Generation Road（231、232）It is made up of a diode and a resistor coupled in parallel.
3. according to the solid-state relay of claim 1 or 2, it is characterised in that：Described output switch circuit（23）End simultaneously
Join a resistance-capacitance absorption loop（233）；Described resistance-capacitance absorption loop（233）By electric capacity（C1）It is in parallel pressure-sensitive after series resistance R6
Resistance V1 is formed.
4. according to the solid-state relay of claim 1 or 2, it is characterised in that：Described input circuit（21）Middle one finger of increase
Show circuit（211）；Described indicating circuit（211）It is made up of current-limiting resistance R2 and light emitting diode；Current-limiting resistance (R2) and hair
Input circuit is connected in parallel on after optical diode series connection（21）Two inputs between.
5. solid-state relay according to claim 3, it is characterised in that：Described input circuit（21）Middle one finger of increase
Show circuit（211）；Described indicating circuit（211）It is made up of current-limiting resistance (R2) and light emitting diode；Current-limiting resistance (R2) with
Input circuit is connected in parallel on after light emitting diode series connection（21）Two inputs between.
6. according to the solid-state relay of claim 1 or 2, it is characterised in that：Described input circuit（21）Input on just
To one diode D1 of series connection.
7. solid-state relay according to claim 3, it is characterised in that：Described input circuit（21）Input on positive string
Join a diode D1.
8. solid-state relay according to claim 4, it is characterised in that：Described input circuit（21）Input on positive string
Join a diode D1.
9. solid-state relay according to claim 5, it is characterised in that：Described input circuit（21）Input on positive string
Join a diode D1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410312699.5A CN104079280B (en) | 2014-07-03 | 2014-07-03 | A kind of solid-state relay of high withstand voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410312699.5A CN104079280B (en) | 2014-07-03 | 2014-07-03 | A kind of solid-state relay of high withstand voltage |
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| Publication Number | Publication Date |
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| CN104079280A CN104079280A (en) | 2014-10-01 |
| CN104079280B true CN104079280B (en) | 2018-02-02 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108063549B (en) * | 2017-12-28 | 2024-04-12 | 广州金升阳科技有限公司 | Isolation control circuit |
| CN111490548A (en) * | 2020-04-28 | 2020-08-04 | 福开尔（西安）电气有限公司 | Compensation type voltage-stabilizing auxiliary power supply equipment and method for subareas |
| CN113483882B (en) * | 2021-06-29 | 2023-03-14 | 重庆长安新能源汽车科技有限公司 | Electric control sound generating device |
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| CN102255612A (en) * | 2011-03-09 | 2011-11-23 | 无锡市固特控制技术有限公司 | Full-electronic solid-state relay |
| CN102594319A (en) * | 2011-12-20 | 2012-07-18 | 殷晨钟 | Double-lamp indicating solid-state relay |
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| CN203984385U (en) * | 2014-07-03 | 2014-12-03 | 库顿电子科技（厦门）有限公司 | A kind of high withstand voltage solid-state relay |
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| WO2009028189A1 (en) * | 2007-08-31 | 2009-03-05 | Tkr Corporation | Solid state relay |
| CN102255612A (en) * | 2011-03-09 | 2011-11-23 | 无锡市固特控制技术有限公司 | Full-electronic solid-state relay |
| CN102594319A (en) * | 2011-12-20 | 2012-07-18 | 殷晨钟 | Double-lamp indicating solid-state relay |
| CN202535329U (en) * | 2011-12-20 | 2012-11-14 | 殷晨钟 | A passive constantly-closed solid-state relay |
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