CN207559543U - A kind of solid-state relay with overheating protection and alarm output - Google Patents
A kind of solid-state relay with overheating protection and alarm output Download PDFInfo
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- CN207559543U CN207559543U CN201721757552.2U CN201721757552U CN207559543U CN 207559543 U CN207559543 U CN 207559543U CN 201721757552 U CN201721757552 U CN 201721757552U CN 207559543 U CN207559543 U CN 207559543U
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Abstract
The utility model discloses a kind of solid-state relay with overheating protection and alarm output, is related to industrial control field.The utility model major part includes controllable silicon drive circuit, temperature measuring circuit, voltage reference circuit, voltage comparator circuit, control signal cut-off circuit, overtemperature alarm signal output circuit and thyristor output circuit.The purpose of this utility model is to provide a kind of solid-state relays with overtemperature prote and alarm output; the New Solid relay can effectively avoid the problem out of control of thermal breakdown existing for conventional solid-state relay; simultaneously when overheating protection occurs for solid-state relay; a defeated overheating protection alarm signal can be synchronized to external system; to investigate the unusual condition that solid-state body is caused to overheat in time, the further expansion of failure is avoided.
Description
Technical field
The invention belongs to industrial control fields, are related to a kind of solid-state relay with overheating protection and alarm output
Device.
Background technology
Solid-state relay, as switching device, due to not having mechanical movement part, has switch motion speed using silicon-controlled
Degree is fast, does not have the advantages that arcing and sparking, limited without the mechanical action service life in switching process.Therefore it is needed in Industry Control
The occasion of frequent switching circuit has especially obtained very extensive application in electric heating control.
Thermal breakdown：When solid-state relay operating temperature is more than its ultimate-use (limiting service) temperature, because silicon-controlled in solid-state relay
Inherent characteristic, even if solid-state relay control terminal does not apply control voltage, solid-state relay still can be constantly on out of control
Phenomenon of the failure.The thermal breakdown of solid-state relay is not permanent damage, when the operating temperature of solid-state relay declines again
When in normal range of operation, solid-state relay can restore normal again.In solid-state relay in actual use if gone out
Existing duration overload, radiator fan damage, radiator heat-dissipation are bad when unusual conditions, are likely to lead to solid-state relay temperature
Degree rises and thermal breakdown failure occurs.
In many application scenarios of solid-state relay（The boiler of temperature of reaction kettle control, food service industry such as petrochemical industry
Temperature control, incubator temperature control of cultivation industry etc.）, it is desirable that solid-state relay participates in the control object temperature of control one
Determine to stablize in range class, it is impossible to the situation of temperature beyond limit occur.If solid-state relay goes out due to external exception during use
When showing temperature rise and thermal breakdown failure occur, the uncontrollable lasting raising of control object temperature is will result in, if do not increased
Additional detection and salvo, it is possible to safety accident occur or cause serious financial consequences.
Invention content
The purpose of the present invention is to provide a kind of solid-state relays with overtemperature prote and alarm output.This is novel
Solid-state relay can effectively avoid the problem out of control of thermal breakdown existing for conventional solid-state relay.Simultaneously when solid-state relay occurred
When Thermal protection, a defeated overheating protection alarm signal can be synchronized to external system, lead to solid-state body to investigate in time
The unusual condition of overheat avoids the further expansion of failure.
For achieving the above object, the technical solution of the solid-state relay includes：
One controllable silicon drive circuit, for the control signal that inputs control signal input by dividing, amplifying, every
From rear, realize to it is silicon-controlled connect, the control of shutdown.
One temperature measuring circuit, for temperature signal silicon-controlled in solid-state relay to be converted to proportional change therewith
The voltage signal of change.
One voltage reference circuit, for providing stable and accurate voltage reference signal for comparator circuit.
One voltage comparator circuit, the judgement and control for realizing overtemperature prote export.
One control signal cut-off circuit, for when overtemperature prote, the control after control signal input is divided
Signal processed excision, so as to forbid silicon-controlled continuing to be connected.
One overtemperature alarm signal output circuit alerts letter for the passive switch of the output one when overtemperature prote
Number.
One thyristor output circuit, for switching external load circuit.
Present invention be characterized in that including controllable silicon drive circuit, temperature measuring circuit, voltage reference circuit, voltage ratio
Compared with circuit, control signal cut-off circuit, overtemperature alarm signal output circuit and thyristor output circuit, the silicon-controlled driving electricity
Road, temperature measuring circuit, voltage reference circuit, voltage comparator circuit, control signal cut-off circuit, overtemperature alarm signal output electricity
Road and thyristor output circuit pass sequentially through conducting wire and are attached.
Preferably, the voltage comparator circuit is using temperature measuring circuit and voltage reference circuit as input condition, output point
Signal cut-off circuit and overtemperature alarm signal output circuit Kong Zhi not controlled.
Preferably, the voltage comparator circuit is connect with 1 foot of voltage comparator U1 and one end of resistance R5, R6.
Preferably, 3 feet of the voltage comparator U1 respectively with one end of thermistor NTC, one end of adjustable resistance RV1
Connection.
Preferably, 4 feet of the voltage comparator U1 connect respectively with the cathode of one end of resistance R8, standard of precision voltage U2
It connects.
Wherein, the controllable silicon drive circuit by：Resistance R2, R3, R10, R11, R12, capacitance C1, zener diode D1,
Indicator light LED, triode Q1, optocoupler U3 compositions.Resistance R2 one end is as control signal input, and the other end is respectively with resistance R3's
One end, the cathode connection of zener diode D1.The anode of zener diode D1 respectively with the collector of Q1, resistance R10 one
End, the base stage connection of one end of capacitance C1, triode Q3.The collector of triode Q3 connects respectively with one end of resistance R11, R12
It connects, the cathode of indicator light LED is connect with one end of resistance R11.1 foot of optocoupler U3 connects 5V power supplys, one end of 2 feet and resistance R12
Connection；
Wherein, the temperature measuring circuit by：Thermistor NTC, adjustable resistance RV1, resistance R9 compositions.Wherein temperature-sensitive electricity
It hinders the one end of one end of NTC respectively with 3 feet of comparator U1, adjustable resistance RV1 to connect, one end of adjustable resistance RV1 and resistance
One end connection of R9.The voltage reference circuit by：Resistance R8, standard of precision voltage U2 are formed.One end difference of resistance R8
With 4 feet of comparator U1, the cathode of standard of precision voltage U2 connects；
Wherein, the voltage reference circuit by：Resistance R8, standard of precision voltage U2 are formed.One end of resistance R8 respectively with
4 feet of comparator U1, the cathode connection of standard of precision voltage U2；
Wherein, the voltage comparator circuit by：Voltage comparator U1 is formed.1 foot of voltage comparator U1 respectively with resistance
One end connection of R5, R6.3 feet of voltage comparator U1 connect respectively with one end of one end of thermistor NTC, adjustable resistance RV1
It connects.Cathode of 4 feet of voltage comparator U1 respectively with one end of resistance R8, standard of precision voltage U2 is connect；
Wherein, it is described control signal cut-off circuit by：Triode Q1, resistance R4, R6 composition.One end of resistance R6 and voltage
The 1 foot connection of comparator U1, the other end are connect with the base stage of triode Q1, one end of resistance R4.The collector of triode Q1 point
Base stage not with the anode of zener diode D1, one end of resistance R10, one end of capacitance C1, triode Q3 is connect；
Wherein, the overtemperature alarm signal output circuit by：Triode Q2, resistance R7, R5 composition.The current collection of triode Q2
Pole is connect with the output terminal of overtemperature alarm signal.The one end of the base stage of triode Q2 respectively with resistance R7, R5 is connect；
Wherein, the thyristor output circuit by：Bidirectional triode thyristor Q4, resistance R13, R14 are formed.Bidirectional triode thyristor Q4's
A1 ends are connect respectively with one end of resistance R13, output terminals A.The A2 ends of bidirectional triode thyristor respectively with one end of resistance R14, output
Hold B connections.3 feet of the G ends of bidirectional triode thyristor respectively with one end of resistance R14, optocoupler U3 are connect.One end of resistance R13 and light
The 4 feet connection of coupling U3.
The invention has the advantages that：
（1）Overtemperature protection circuit is increased, passes through one and the silicon-controlled NTC thermistor fitted closely, overtemperature prote
Circuit can occur closing silicon-controlled by force before thermal breakdown is out of control silicon-controlled, efficiently solve thermal breakdown existing for conventional solid-state
The drawbacks of hidden danger out of control；
（2）Overtemperature alarm signal output circuit is increased, when solid-state relay enters overtemperature prote state, synchronism output
Alarm signal can effectively shorten the abnormality processing time, avoid the expansion of fault coverage to external system；
（3）Circuit is simple, it is of low cost, be easily achieved.
Description of the drawings
The invention will be further described in the following with reference to the drawings and specific embodiments.
Fig. 1 is the principle of the present invention block diagram.
Fig. 2 is the circuit diagram of the present invention.
Specific embodiment
In order to make the technical means, creative features, achievement of purpose and effectiveness of the invention easy to understand, with reference to tool
Invention is expanded on further in body embodiment.
With reference to Fig. 1, Fig. 1 illustrates the system connection relation of the present invention：
Controllable silicon drive circuit（1）, temperature measuring circuit（2）, voltage reference circuit（3）, voltage comparator circuit（4）, control
Signal cut-off circuit processed（5）, overtemperature alarm signal output circuit（6）And thyristor output circuit（7）, the silicon-controlled driving electricity
Road（1）, temperature measuring circuit（2）, voltage reference circuit（3）, voltage comparator circuit（4）, control signal cut-off circuit（5）, it is super
Warm alarm signal output circuit（6）And thyristor output circuit（7）Conducting wire is passed sequentially through to be attached.
Wherein, the voltage comparator circuit（4）With temperature measuring circuit（2）And voltage reference circuit（3）For input condition,
Control controls signal cut-off circuit respectively for output（5）With overtemperature alarm signal output circuit（6）.
Wherein, the voltage comparator circuit（4）It is connect with 1 foot of voltage comparator U1 and one end of resistance R5, R6.
Wherein, 3 feet of the voltage comparator U1 connect respectively with one end of one end of thermistor NTC, adjustable resistance RV1
It connects.
Wherein, 4 feet of the voltage comparator U1 connect respectively with the cathode of one end of resistance R8, standard of precision voltage U2
It connects.
With reference to Fig. 2, Fig. 2 illustrates that the circuit connecting relation of the present invention, operation principle are for this specific implementation：
1. controllable silicon drive circuit connection relation, operation principle：Controllable silicon drive circuit by resistance R2, R3, R10, R11,
R12, capacitance C1, zener diode D1, indicator light LED, triode Q1, optocoupler U3 composition.
（1）Resistance R2 one end as control signal input, the other end respectively with one end of resistance R3, zener diode D1
Cathode connects.The anode of zener diode D1 respectively with the collector of Q1, one end of resistance R10, one end of capacitance C1, three poles
The base stage connection of pipe Q3.The one end of the collector of triode Q3 respectively with resistance R11, R12 is connect, the cathode of indicator light LED with
One end connection of resistance R11.1 foot of optocoupler U3 connects 5V power supplys, and 2 feet are connect with one end of resistance R12.
（2）One end input of the external control signal through R2 resistance.
（3）When input control voltage is less than 2V, the undertension after R2, R3 partial pressure is to enable zener diode D1 reversed
Puncture, triode Q3 is in cut-off state at this time, and the no electric current of primary of indicator light LED and optocoupler U3 flow through, time of optocoupler U3
Pole and bidirectional triode thyristor Q3 are in cut-off state.
（4）When input control voltage is higher than 5V, the voltage after R2, R3 partial pressure by zener diode D1 reverse breakdowns,
Triode Q3 is in saturation conduction state at this time, and the primary of indicator light LED and optocoupler U3 flow through rated current, indicator light LED points
Bright, the secondary pole of optocoupler U3 is connected, and bidirectional triode thyristor Q3 is in the conduction state.
（5）The leakage current when effect of resistance R10 is back breakdown non-in order to avoid zener diode D1 leads to Q3 malfunctions
Make.The effect of capacitance C1 is to filter out input circuit clutter.
2. temperature measuring circuit connection relation, operation principle：Temperature measuring circuit is by thermistor NTC, adjustable resistance
RV1, resistance R9 are formed.
（1）The one end of one end of thermistor NTC respectively with 3 feet of comparator U1, adjustable resistance RV1 is connect, adjustable electric
One end of resistance RV1 is connect with one end of resistance R9.
（2）Thermistor NTC is the thermistor of negative temperature coefficient, and when installation is close to silicon-controlled cooling fin.When controllable
During the temperature rise of silicon, thermistor NTC resistance becomes smaller, since adjustable resistance RV1 and resistance R9 resistance are constant, thermistor
The voltage of NTC and adjustable resistance RV1 tie points will decrease.Otherwise as silicon-controlled Wen Duxiajiang, thermistor NTC electricity
Resistive is big, and since adjustable resistance RV1 and resistance R9 resistance are constant, the voltage of thermistor NTC and adjustable resistance RV1 tie points will
It increases.
（3）Adjustable resistance RV1 is used for adjustment circuit component error, and the overtemperature prote threshold temperature of solid-state relay is made all to exist
In same range.
3. voltage reference circuit connection relation, operation principle：Voltage reference circuit is by resistance R8, standard of precision voltage U2 groups
Into.
（1）Respectively with 4 feet of comparator U1, the cathode of standard of precision voltage U2 connects for one end of resistance R8.
（2）U2 is high-precision, the voltage reference of Low Drift Temperature, and resistance R8 provides voltage for it and limits its operating current,
U2 cathode can generate a highly stable reference voltage, and be supplied to voltage comparator circuit as its voltage reference.
4. voltage comparator circuit connection relation, operation principle：Voltage comparator circuit is made of voltage comparator U1.
（1）The one end of 1 foot of voltage comparator U1 respectively with resistance R5, R6 is connect.3 feet of voltage comparator U1 respectively with
One end of thermistor NTC, one end connection of adjustable resistance RV1.4 feet of voltage comparator U1 respectively with one end of resistance R8,
The cathode connection of standard of precision voltage U2.
（2）4 foot of negative input of voltage comparator U1 connects the cathode of voltage reference U2 and one end of resistance R8 respectively, should
Foot voltage is constantly equal to reference voltage, is not influenced by external voltage and temperature fluctuation.
（3）3 foot of positive input of voltage comparator U1 connects thermistor NTC one end, adjustable resistance RV1 one end respectively,
The foot voltage and the variation in direct ratio of silicon-controlled heatsink temperature.
（4）The voltage of the 3rd feet of voltage comparator U1 is less than the 4th foot voltages of voltage comparator U1 under normal circumstances, electric at this time
It is low level to press the output of the 1st foot of comparator.
（5）When temperature of silicon controlled rectifier constantly rises, since the 4th foot voltage constants of voltage comparator U1 are constant, when voltage ratio
When rising above voltage comparator the 4th foot voltages of U1 compared with the 3rd foot voltages of device U1, the output of the 1st foot of voltage comparator is height
Level.
5. control signal cut-off circuit connection relation, operation principle：Signal cut-off circuit is controlled by triode Q1, resistance
R4, R6 are formed.
（1）One end of resistance R6 is connect with the 1st feet of voltage comparator U1, the other end respectively with one end of resistance R4 and three poles
The base stage connection of pipe Q1.The collector of triode Q1 respectively with the anode of zener diode D1, one end of resistance R10, capacitance C1
One end, triode Q3 base stage connection.
（2）The 1st feet of the voltage comparator U1 output low level being connect under normal circumstances with resistance R6, triode Q1, which is in, to be cut
Only state, triode Q3, optocoupler U3, bidirectional triode thyristor Q4 working condition be completely controlled by external input control signal.
（3）The 1st feet of voltage comparator U1 being connect in the case of overtemperature prote with resistance R6 output high level, three poles occur
Pipe Q1 is in saturation conduction state, and the control signal through zener diode D1 inputs is shorted to ground, triode Q3, optocoupler by Q1
U3, bidirectional triode thyristor Q4 are in stopping state.Externally input control signal is removed.
6. overtemperature alarm signal output circuit connection relation, operation principle：Overtemperature alarm signal output circuit is by triode
Q2, resistance R7, R5 composition.
（1）One end of resistance R5 is connect with the 1st feet of voltage comparator U1, the other end respectively with one end of resistance R7 and three poles
The base stage connection of pipe Q2.
（2）The 1st feet of the voltage comparator U1 output low level being connect under normal circumstances with resistance R5, triode Q2, which is in, to be cut
Only state.
（3）The 1st feet of voltage comparator U1 being connect in the case of overtemperature prote with resistance R5 output high level, three poles occur
Pipe Q2 is in saturation conduction state, and overtemperature alarm signal is exported to outside.
7. thyristor output circuit connection relation, operation principle：Thyristor output circuit is by bidirectional triode thyristor Q4, resistance
R13, R14 are formed.
（1）The A1 ends of bidirectional triode thyristor Q4 are connect respectively with one end of resistance R13, output terminals A.The A2 ends of bidirectional triode thyristor
It is connect respectively with one end of resistance R14, output terminal B.The G ends of bidirectional triode thyristor respectively with one end of resistance R14, optocoupler U3 3
Foot connects.One end of resistance R13 is connect with 4 feet of optocoupler U3.
（2）Resistance R13 is the G limit leakage resistances of bidirectional triode thyristor Q4, when input control voltage does not surpass higher than 5V and
During temperature protection, 3 feet of optocoupler U3 and the conducting of 4 feet, bidirectional triode thyristor Q4 are in the conduction state.When input control voltage less than 2V or
When overtemperature prote occurs, 3 feet and 4 feet of optocoupler U3 are in off state, and bidirectional triode thyristor Q4 is closed.
（3）Resistance R14 is the antijamming capability to improve bidirectional triode thyristor Q4, avoids false triggering
The basic principles, main features and the advantages of the invention have been shown and described above.The technology of the industry
For personnel it should be appreciated that the present invention is not limited to the above embodiments, described in the specification of above-described embodiment is to illustrate this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (5)
1. a kind of solid-state relay with overheating protection and alarm output, which is characterized in that including silicon-controlled driving electricity
Road（1）, temperature measuring circuit（2）, voltage reference circuit（3）, voltage comparator circuit（4）, control signal cut-off circuit（5）, it is super
Warm alarm signal output circuit（6）And thyristor output circuit（7）, the controllable silicon drive circuit（1）, temperature measuring circuit
（2）, voltage reference circuit（3）, voltage comparator circuit（4）, control signal cut-off circuit（5）, overtemperature alarm signal output circuit
（6）And thyristor output circuit（7）Conducting wire is passed sequentially through to be attached.
2. a kind of solid-state relay with overheating protection and alarm output according to claim 1, feature exist
In the voltage comparator circuit（4）With temperature measuring circuit（2）And voltage reference circuit（3）For input condition, output is controlled respectively
System control signal cut-off circuit（5）With overtemperature alarm signal output circuit（6）.
3. a kind of solid-state relay with overheating protection and alarm output according to claim 1, feature exist
In the voltage comparator circuit（4）It is connect with 1 foot of voltage comparator U1 and one end of resistance R5, R6.
4. a kind of solid-state relay with overheating protection and alarm output according to claim 3, feature exist
It is connect in one end respectively with one end of thermistor NTC, adjustable resistance RV1 of 3 feet of, the voltage comparator U1.
5. a kind of solid-state relay with overheating protection and alarm output according to claim 3, feature exist
It is connect in cathode of 4 feet respectively with one end of resistance R8, standard of precision voltage U2 of, the voltage comparator U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721757552.2U CN207559543U (en) | 2017-12-15 | 2017-12-15 | A kind of solid-state relay with overheating protection and alarm output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721757552.2U CN207559543U (en) | 2017-12-15 | 2017-12-15 | A kind of solid-state relay with overheating protection and alarm output |
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| Publication Number | Publication Date |
|---|---|
| CN207559543U true CN207559543U (en) | 2018-06-29 |
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ID=62664521
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721757552.2U Active CN207559543U (en) | 2017-12-15 | 2017-12-15 | A kind of solid-state relay with overheating protection and alarm output |
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| CN (1) | CN207559543U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111251834A (en) * | 2019-11-28 | 2020-06-09 | 杭州广安汽车电器有限公司 | Heating system of intelligent automobile air conditioner |
-
2017
- 2017-12-15 CN CN201721757552.2U patent/CN207559543U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111251834A (en) * | 2019-11-28 | 2020-06-09 | 杭州广安汽车电器有限公司 | Heating system of intelligent automobile air conditioner |
| CN111251834B (en) * | 2019-11-28 | 2022-01-07 | 杭州广安汽车电器有限公司 | Heating system of intelligent automobile air conditioner |
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| TR01 | Transfer of patent right |
Effective date of registration: 20220713 Address after: 528400 Guangdong province Zhongshan City Shiqi District No. 8 West China branch Patentee after: Guangdong Dongqi Electric Co.,Ltd. Address before: The public road 528400 private technology park in Guangdong province Zhongshan City Shiqi District No. 3 Patentee before: SOMMY AUTOMATION GROUP SHARES Co.,Ltd. |
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| TR01 | Transfer of patent right |