CN108183050A - A kind of high security switch control relay drive circuit - Google Patents
A kind of high security switch control relay drive circuit Download PDFInfo
- Publication number
- CN108183050A CN108183050A CN201810164117.1A CN201810164117A CN108183050A CN 108183050 A CN108183050 A CN 108183050A CN 201810164117 A CN201810164117 A CN 201810164117A CN 108183050 A CN108183050 A CN 108183050A
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- China
- Prior art keywords
- triode
- switch module
- positive pole
- relay
- microcontroller
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
- H01H47/32—Energising current supplied by semiconductor device
Abstract
The present invention provides a kind of high security switch control relay drive circuit, including microcontroller, positive pole switch module and earthing switch module；Relay one end is connect by positive pole switch module with positive pole；The relay other end is connect by earthing switch module with ground terminal；Positive pole switch module and earthing switch module are connect with microcontroller；It is driven between microcontroller and positive pole switch module by pwm signal；Microcontroller is driven with earthing switch module using delivery outlet.High security switch control relay drive circuit provided by the invention, the positive pole and ground terminal of relay are controlled by setting up two groups of electronic switches i.e. positive pole switch module and earthing switch module respectively；The probability of relay abnormal caused by greatly reducing fault；Meanwhile the different control signals for two modules for passing through setting, relay abnormal problem caused by solving single chip microcomputer halt improve the safety of relay drive circuit.
Description
Technical field
The present invention relates to control relay circuit field, more particularly to a kind of high security switch control relay driving electricity
Road.
Background technology
It is a kind of universal way to be opened or closed in the several ways of electric heating control by relay control.And for class such as
Electric heating equipment (having the equipment such as the high temperature high current of certain risk) switch, needs tightened up safety precautions to control, no
It is then still practical because failure can not disconnect the power supply of heating equipment when being heated to stop heating, it may occur however that due to
High temperature then causes the problem of serious fire.The relay drive circuit of electric heating control of the prior art is as shown in Figure 1, packet
Triode Q4, diode D2, resistance R8 and R9 are included, existing risk is as follows:
On the one hand, after short circuit between triode Q4 damages collector and emitter, relay REL2 will be at long-time
In suction and state, i.e. long-time is also in the state connected, electric heating equipment is made to continue do not needing to by relay REL2 contacts
Continuous heating during heating, and lasting high temperature easily leads to burning out for heating equipment, causes the generation of fire incident；
On the other hand, the drive signal of triode Q4 comes from MCU, in use, MCU often occurs because of programming
The problem of reasons such as flaw, external high frequency spike, electrostatic, strong electromagnetic cause MCU to crash, and MCU is former after crashing
Drive signal is that high level either low level signal is uncertain, i.e. the drive signal Heat-Driver2 of triode Q4 exists
MCU is likely to be effective drive signal of high level after crashing, then the problem of bringing is exactly the lasting suctions of relay REL2
With, the lasting connection in conductance relay REL2 contacts, electric heating equipment is made to continue the continuous heating when not needing to heating, causes to heat
Equipment is burnt.
Safety defect for the relay drive circuit for solving electric heating control of the prior art, there is an urgent need to work out
A kind of safer, more reliable electrical heating switch control relay drive circuit that can solve more than safety defect.
Invention content
To solve the problems, such as to mention in above-mentioned background technology, the present invention provides a kind of high security switch control relay and drives
Dynamic circuit, including microcontroller, positive pole switch module and earthing switch module；Wherein：
Relay one end is connect by positive pole switch module with positive pole；The relay other end passes through ground connection
Switch module is connect with ground terminal；The positive pole switch module and earthing switch module are connect with microcontroller；
It is driven between the microcontroller and positive pole switch module by pwm signal；
The microcontroller is driven with earthing switch module using delivery outlet.
Further, the positive pole switch module includes triode Q1, triode Q2 and polar capacitor C2；Described three
Pole pipe Q2 and triode Q1 are sequentially connected between the microcontroller and relay；Lead between the triode Q2 and triode Q1
Polar capacitor C2 is crossed to connect with positive pole；The positive pole is also connect by triode Q1 with relay.
Further, the triode Q2 is connect with polar capacitor C2 by resistance R4；The triode Q2 and triode
Q1 is connected by resistance R6.
Further, the triode Q1 is also connect with positive pole by resistance R5.
Further, the microcontroller passes sequentially through capacitance C1 and resistance R2 and is connect with the triode Q2.
Further, it is equipped between the capacitance C1 and microcontroller and between the resistance R2 and the triode Q2
Pull down resistor.
Further, the triode Q1 is positive-negative-positive；The triode Q2 is NPN type.
High security switch control relay drive circuit provided by the invention, by setting up two groups of electronic switches i.e. power supply
Positive switch module and earthing switch module control the positive pole and ground terminal of relay respectively；Greatly reduce fault
The probability of caused relay abnormal；Meanwhile the different control signals for two modules for passing through setting, solve microcontroller
Relay abnormal problem caused by crash improves the safety of circuit.High security switch control relay provided by the invention
Device driving circuit, safety that is simple in structure, improving relay drive circuit are led in relay electrothermal driving control circuit
Domain is with a wide range of applications.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments, for those of ordinary skill in the art, without having to pay creative labor, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the circuit diagram of electrical heating relay drive circuit of the prior art；
Fig. 2 is the schematic diagram of high security provided by the invention switch control relay drive circuit；
Fig. 3 is the physical circuit figure of high security switch control relay drive circuit.
Reference numeral：
10 microcontroller, 20 positive pole switch module, 30 relay
40 earthing switch modules 50 load
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiments obtained without making creative work shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the similar word such as term " connection " or " connected " is simultaneously non-limiting
With the connection of physics or machinery, but electrical connection, light connects etc. can be included, either directly or indirectly.
The embodiment of the present invention provides a kind of high security switch control relay drive circuit, including microcontroller 10, power supply
Positive switch module 20 and earthing switch module 40；Wherein：
30 one end of relay is connect by positive pole switch module 20 with positive pole；30 other end of relay leads to
Earthing switch module 40 is crossed to connect with ground terminal；The positive pole switch module 20 and earthing switch module 40 with microcontroller 10
Connection；
It is driven between the microcontroller 10 and positive pole switch module 20 by pwm signal；
The microcontroller 10 is driven with earthing switch module 40 using delivery outlet.
When it is implemented, as shown in Figure 2 and Figure 3,30 coil one end of relay passes through positive pole switch module 20 and power supply
Anode connects；The 30 coil other end of relay is connect by earthing switch module 40 with ground terminal；30 contact both ends of relay connect
Load 50；Positive pole switch module 20 and earthing switch module 40 are connect with microcontroller 10；Microcontroller 10 and positive pole
It is driven between switch module 20 by pwm signal；Microcontroller 10 is driven with earthing switch module 40 using delivery outlet.
Relay is controlled respectively by setting up two groups of electronic switches i.e. positive pole switch module 20 and earthing switch module 40
The positive pole and ground terminal of device 30, short trouble, which occurs, in any one group of electronic switch will not all cause relay 30 is abnormal to inhale
Close conducting.
Pwm signal is driven to pulse width modulation in the present patent application, i.e. PWM exports 10ms high level 10ms low levels,
It continuously repeats down, the pulse signal of formation；Pass through the pulse signal of continuous low level and high level regular fluctuation ability
Circuit of the useful effect in the present patent application；Meanwhile driving end reliability is also enhanced by pwm signal type of drive.
The delivery outlet used in the present patent application is driven to output high level or low level driving.
Due to occurring that lasting high level or low level when microcontroller 10 crashes, then the pwm signal of output originally
Port output is lasting high level or low level, this is different from pwm signal, can not make the general of positive pole switch module 20+
24V voltage turn-ons must be positive pole switch module 20 and earthing switch module 40 in circuit while lead to relay 30
Generalist can make relay 30 work.Therefore in the case where microcontroller 10 crashes, relay 30 will disconnect, and be disconnected so as to play protection
Effect；Also, when short circuit occurs between the collector and emitter of triode Q3, then microcontroller 10 passes through to controlling power supply just
Pole switch module 20 inputs non-pwm signal, and positive pole switch module 20 is disconnected, you can realizes the protection to relay 30.
High security switch control relay drive circuit provided by the invention, by setting up two groups of electronic switches i.e. power supply
Positive switch module and earthing switch module control the positive pole and ground terminal of relay respectively；Greatly reduce fault
The probability of caused relay abnormal；Meanwhile the different conductivity control signals for two modules for passing through setting, solve list
Relay abnormal problem caused by piece machine crashes, improves the safety of circuit.High security switch control provided by the invention
Relay drive circuit, safety that is simple for structure, improving relay drive circuit, is with a wide range of applications.
Preferably, the positive pole switch module 20 includes triode Q1, triode Q2 and polar capacitor C2；Described three
Pole pipe Q2 and triode Q1 is sequentially connected between the microcontroller 10 and relay 30；The triode Q2 and triode Q1 it
Between connect by polar capacitor C2 with positive pole；The positive pole is also connect by triode Q1 with relay 30.
When it is implemented, positive pole switch module 20 includes triode Q1, triode Q2 and polar capacitor C2；Microcontroller
10 connect with triode Q2 base stages；Triode Q2 emitters are grounded；Triode Q2 collectors, triode Q1 base stages are electric with polarity
Hold the connection of C2 cathode；Triode Q1 emitters and polar capacitor C2 anodes are connect with+24V power supplys；Triode Q1 collectors with
30 coil one end of relay connects；Triode Q1 is A733 type PNP triodes in more than circuit；Triode Q2 is C945 types NPN
Triode；The parameter of polar capacitor C2 is 10 μ F/35V；
In addition, the earthing switch module in the present invention includes triode Q3, resistance R10, resistance R7；Triode Q3 collectors
It is connect with relay coil and diode D1 anodes；Diode D1 cathodes also connect with relay coil with triode Q1 collectors
It connects；Triode Q3 base stages are connect with resistance R10 one end and resistance R7 one end；The resistance R10 other ends are connect with microcontroller 10；Resistance
The R7 other ends and the equal grounding connection of triode Q3 emitters；Triode Q3 is C945 type NPN triodes in more than circuit；Resistance
The resistance value of R10 is 4K Ω -5K Ω；Preferably, the resistance value 4.7K Ω of resistance R10；The resistance value of resistance R7 is 8K Ω -11K Ω；Preferably
Ground, the resistance value 10K Ω of resistance R7；The signal of diode D1 is IN4004.
When it is high level that microcontroller 10, which exports PWM-Driver signals (pwm pulse drive signal), triode Q2 saturations
Conducting；With the saturation conduction of triode Q2 ,+the 24V being connect with triode Q1 emitters passes through base stage, using what is be connected
Triode Q2 collector and emitters form effective driving circuit to GND so that triode Q1 also saturation conductions, relay
Positive terminal voltage+the 24V of 30 (REL1) is effectively output to one end of 30 coil of relay；
Meanwhile polar capacitor C2 electrolytic capacitors also pass through the Q2 transistor collectors be connected and emitter and connect to GND
It connects, forms effective charge circuit, the voltage at C2 both ends will be gradually increased to 23.7V (C2 voltages=24V-Vce=24V-0.3V
=23.7V), Vce is collector-emitter conduction voltage drop of triode Q2, and the cathode of polar capacitor C2 is then close to GND voltage
=Vce=0.3V or so.
When it is high level that microcontroller 10, which exports PWM-Driver signals, and microcontroller 10 exports Drive signals as high electricity
Usually, triode Q3 saturation conductions.The other end of 30 coil of relay is effectively conducting to GND this moment, and relay is effectively driven
Action, the contact A CL of relay are conducting to ACL-Out and effectively export, and controlled load 50 could work normally.
When it is low level that microcontroller 10, which exports Driver signals, triode Q2 because lose effective bias voltage and
Driving current and end.But because polar capacitor C2 has already been through PWM-Driver pulse signals as high electricity before at the moment
Effective charging usually, thus polar capacitor C2 anodes also by the emitter of triode Q1 to base stage, by resistance R6 and electricity
R4 current limlitings are hindered, polar capacitor C2 cathode (0.3V or so can treat as GND) is returned to and so forms another and effectively drive back
Road, keeps the saturation conduction of triode Q1, and the cathode voltage+24V of relay 30 effectively keeps being output to 30 coil of relay
One end；The low electricity of PWM-Driver pulse signals is implemented in a manner of converting the charging and discharging function of polar capacitor C2
It usually carves and keeps effective driving function；
When PWM-Driver pulse signals are low level, and polar capacitor C2 is discharged into and is unable to maintain that triode Q1's is normal
During driving current, when not occurring the high level of PWM-Driver pulse signals also, then triode Q1 will end disconnection+24V, after
Therefore electric appliance 30 also disconnects；It can be seen that only lasting PWM-Driver pulse low and high level variable signals could maintain triode Q1
Conducting, if the MCU for generating PWM-Driver pulse signals crashes, either lasting high level or lasting low electricity
It is flat, triode Q1 can all be caused to end so that relay 30 is disconnected by protection, shown when microcontroller surprisingly occurs can
By protecting break function, the generation of uncontrollable danger is avoided, so as to greatly improve the height reliability of driving；
If short circuit occurs between the collector and emitter of triode Q3, microcontroller 10 is by opening control positive pole
It closes module 20 and inputs non-pwm signal, positive pole switch module 20 is disconnected, you can realize the protection to relay 30；This hair
In the positive pole switch module 20 of bright offer, triode Q2 and the probability that triode Q3 is damaged simultaneously are very low, ensure that power supply
The disconnection of relay 30 is protected in 40 short circuit of earthing module in positive switch module 20.
In addition, 10 powered on moment of microcontroller can export of short duration high level pulse signal, the actuation for making relay 30 of short duration
It once decontrols again, the power supply of same 30 contact of relay be also of short duration connection once heating equipment, heating equipment starts
The high current of moment carrys out abnormal influence to the contact web of relay 30, and the contact endurance of relay 30 is caused to shorten.Except list
External disturbance pulse signal except piece machine 10 also be easy to cause the of short duration of triode Q3 by triode Q3 to signal amplification to be had
Effect conducting causes the heated equipment in 30 contact of relay to start the high current Ground shock waves of moment, similarly results in relay 30
Contact endurance shorten；The present invention believes by the structure design of triode Q1, triode Q2 and polar capacitor C2, then by PWM
Number mode that is combined with delivery outlet drive signal of driving, in 10 powered on moment of microcontroller or the feelings there are external disturbance pulse signal
Under condition, relay 30 can be protected.
Preferably, the triode Q2 is connect with polar capacitor C2 by resistance R4；The triode Q2 and triode Q1
It is connected by resistance R6.
When it is implemented, triode Q2 collectors are connect with polar capacitor C2 cathode by resistance R4；Triode Q2 current collections
Pole is connect with triode Q1 base stages by resistance R6；The charging and discharging that triode Q1 passes through current-limiting resistance R4 and polar capacitor C2
Function coordinates the pwm signal mode of polar capacitor C2 to drive, it is ensured that during PWM effectively the drives base stage of triode Q1
It can continue to keep low level effective drive signal, so that it is guaranteed that relay 30 can obtain+24V the voltages of continuous and effective, realize
PWM drive signal is converted to effective low level drive signal.
Preferably, the triode Q1 is also connect with positive pole by resistance R5.
When it is implemented, triode Q1 base stages are also connect with positive pole by resistance R5, resistance R5 is pull-up resistor, is used
In the triode Q1 before triode Q2 is connected not yet is prevented to be interfered signal and malfunction, enhance jamproof ability.
Preferably, the microcontroller 10 passes sequentially through capacitance C1 and resistance R2 and is connect with the triode Q2.
When it is implemented, microcontroller 10 passes sequentially through capacitance C1 and resistance R2 is connect with triode Q2；By capacitance C1's
Coupling, the current limliting of resistance R2 provide effective bias voltage and driving current to triode Q2 base stages, lead triode Q2 saturations
It is logical.
Preferably, it is equipped between the capacitance C1 and microcontroller 10 and between the resistance R2 and the triode Q2
Pull down resistor.
When it is implemented, capacitance C1 is connect with the connecting node of microcontroller 10 with resistance R1 one end；Resistance R2 and triode
The connecting node of Q2 base stages is connect with resistance R3 one end；The resistance R1 other ends, the resistance R3 other ends and the equal grounding connection of emitter；
Resistance R1 and resistance R3 is pull down resistor, and resistance R1 and resistance R3 can prevent triode Q2 to be interfered signal and malfunction,
Enhance jamproof ability.
Preferably, the triode Q1 is positive-negative-positive；The triode Q2 is NPN type.
In more than circuit, the resistance value of resistance R1 and resistance R1 are 8K Ω -11K Ω；Preferable ground resistance R1's and resistance R1
Resistance value is 10K Ω；The resistance value of resistance R2 is 4K Ω -5K Ω；The resistance value of preferable ground resistance R2 is 4.7K Ω；The resistance value of resistance R4
For 0.5K Ω -2K Ω；The resistance value of preferable ground resistance R4 is 1K Ω；The resistance value of resistance R5 is 45K Ω -50K Ω；Preferable ground resistance R5
Resistance value be 47K Ω；The resistance value of resistance R6 is 8K Ω -12K Ω；The resistance value of preferable ground resistance R6 is 10K Ω；The capacitance of capacitance C1
For 0.05 μ F-0.2 μ F；Preferably the capacitance of capacitance C1 is 0.1 μ F.
Although more herein used such as microcontroller, diode, triode, resistance, capacitance, relay, power supply
The terms such as positive switch module, earthing switch module, load, but it does not preclude the possibility of using other terms.Use these
Term is only for the convenience of describing and explaining the nature of the invention；It is construed as any one of the additional limitations all
It is disagreed with spirit of the present invention.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe is described in detail the present invention with reference to foregoing embodiments, it will be understood by those of ordinary skill in the art that：Its according to
Can so modify to the technical solution recorded in foregoing embodiments either to which part or all technical features into
Row equivalent replacement；And these modifications or replacement, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (7)
1. a kind of high security switch control relay drive circuit, it is characterised in that：It is opened including microcontroller (10), positive pole
Close module (20) and earthing switch module (40)；Wherein：
Relay (30) one end is connect by positive pole switch module (20) with positive pole；Relay (30) other end
It is connect by earthing switch module (40) with ground terminal；The positive pole switch module (20) and earthing switch module (40) with
Microcontroller (10) connects；
It is driven between the microcontroller (10) and positive pole switch module (20) by pwm signal；
The microcontroller (10) is driven with earthing switch module (40) using delivery outlet.
2. high security switch control relay drive circuit according to claim 1, it is characterised in that：The power supply is just
Pole switch module (20) includes triode Q1, triode Q2 and polar capacitor C2；The triode Q2 and triode Q1 connect successively
It is connected between the microcontroller (10) and relay (30)；Between the triode Q2 and triode Q1 by polar capacitor C2 with
Positive pole connects；The positive pole is also connect by triode Q1 with relay (30).
3. high security switch control relay drive circuit according to claim 2, it is characterised in that：The triode
Q2 is connect with polar capacitor C2 by resistance R4；The triode Q2 is connect with triode Q1 by resistance R6.
4. high security switch control relay drive circuit according to claim 3, it is characterised in that：The triode
Q1 is also connect with positive pole by resistance R5.
5. high security switch control relay drive circuit according to claim 2, it is characterised in that：The microcontroller
(10) capacitance C1 and resistance R2 is passed sequentially through to connect with the triode Q2.
6. high security switch control relay drive circuit according to claim 5, it is characterised in that：The capacitance C1
Pull down resistor is equipped between microcontroller (10) and between the resistance R2 and the triode Q2.
7. control relay drive circuit is switched according to claim 2-6 any one of them high security, it is characterised in that：Institute
Triode Q1 is stated as positive-negative-positive；The triode Q2 is NPN type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810164117.1A CN108183050B (en) | 2018-02-27 | 2018-02-27 | High-safety switch control relay driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810164117.1A CN108183050B (en) | 2018-02-27 | 2018-02-27 | High-safety switch control relay driving circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108183050A true CN108183050A (en) | 2018-06-19 |
| CN108183050B CN108183050B (en) | 2023-09-05 |
Family
ID=62553269
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810164117.1A Active CN108183050B (en) | 2018-02-27 | 2018-02-27 | High-safety switch control relay driving circuit |
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| CN110336354A (en) * | 2019-07-09 | 2019-10-15 | 欣旺达电子股份有限公司 | The power control circuit of battery management system |
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| CN109471025B (en) * | 2018-11-09 | 2020-12-29 | 四川赛科安全技术有限公司 | Method for realizing electromagnetic relay line detection and feedback signal detection by double voltages |
| CN110336354A (en) * | 2019-07-09 | 2019-10-15 | 欣旺达电子股份有限公司 | The power control circuit of battery management system |
| CN110618625A (en) * | 2019-07-18 | 2019-12-27 | 青岛经济技术开发区海尔热水器有限公司 | Control system, control method and electronic device |
| CN110618625B (en) * | 2019-07-18 | 2021-12-07 | 青岛经济技术开发区海尔热水器有限公司 | Control system, control method and electronic device |
| CN114415755A (en) * | 2022-01-10 | 2022-04-29 | 河南省医疗器械检验所 | Heating system with failure prevention function and heating method |
| CN114415755B (en) * | 2022-01-10 | 2023-02-28 | 河南省医疗器械检验所 | Heating system with failure prevention function and heating method |
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| CN108183050B (en) | 2023-09-05 |
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