CN205752025U - Relay drive circuit and relay circuit - Google Patents
Relay drive circuit and relay circuit Download PDFInfo
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- CN205752025U CN205752025U CN201620271555.4U CN201620271555U CN205752025U CN 205752025 U CN205752025 U CN 205752025U CN 201620271555 U CN201620271555 U CN 201620271555U CN 205752025 U CN205752025 U CN 205752025U
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Abstract
The utility model discloses a kind of relay drive circuit and relay circuit, this relay drive circuit includes: the first switch element, described first switch element is arranged between the working power of described relay and ground end, and is configured on or off under control signal control；Second switch element, described second switch element is arranged between the working power of described relay and ground end, and it is connected with described first switch elements in series, described second switch element is configured on or off under described control signal controls, and control signal generative circuit, described control signal generative circuit is configured to generate described control signal, to control described first switch element and the turn-on and turn-off of second switch element.The probability of relay abnormal can be reduced according to relay drive circuit of the present utility model, improve safety criterion.This relay circuit has similar advantage.
Description
Technical field
This utility model relates to electrical heating utensil technical field, particularly relates to a kind of relay drive circuit and relay electricity
Road.
Background technology
Relay is used as switch element the most in circuit, it is however generally that all use semiconductor device driving as relay
Galvanic electricity road.But owing to semiconductor device is more fragile, then can hold in the occasion that the unfavorable factors such as electrostatic, overvoltage, excessively stream occur
It is easily caused it to puncture or straight-through damage.In addition work disorderly when the single chip microcomputer halt controlling relay work also results in relay
Disorderly.If driving the semiconductor device of relay work to occur abnormal, the most easily cause relay abnormal work, so cause serious after
Really.If such as relay is used as to control the switch of heating circuit, when relay abnormal work, then may need not conducting
In the case of constant conduction, this situation is easily drawn breaking out of fire, and then is caused personal injury or property loss.
Current relay is generally used the drive circuit of easy scheme to control its work, and this scheme is difficult to pass through
The standard of improper test, potential safety hazard is bigger.Accordingly, it is desirable to provide a kind of relay drive circuit, to solve at least in part
Certainly issue noted above.
Utility model content
Introducing the concept of a series of reduced form in utility model content part, this will be in specific embodiment part
Further describe.Utility model content part of the present utility model is not meant to attempt to limit required for protection
The key feature of technical scheme and essential features, more do not mean that the protection attempting to determine technical scheme required for protection
Scope.
In order to solve the problems referred to above at least in part, the utility model discloses a kind of relay drive circuit, be used for controlling
The closed and disconnected of relay processed, comprising: the first switch element, described first switch element is arranged on the work of described relay
Make between power supply and ground end, and be configured on or off under control signal control；Second switch element, described second opens
Close element to be arranged between the working power of described relay and ground end, and be connected with described first switch elements in series, institute
State second switch element and be configured on or off under described control signal controls, and control signal generative circuit, described
Control signal generative circuit is configured to generate described control signal, to control described first switch element and second switch element
Turn-on and turn-off.
According to relay drive circuit of the present utility model, by making described first switch element and described second switch unit
Part is connected in series between the working power of relay and ground end, so only described first switch element and described second switch
When element is both turned on, described relay just closes, the then institute when the first switch element and described second switch element have to turn off
State relay to disconnect.Therefore the probability of relay abnormal can be reduced, and owing to effectively reducing relay exception work
The risk made, therefore decreases the serious consequence produced therefrom, improves safety criterion.
Preferably, described first switch element is the first audion, the colelctor electrode of described first audion and described relay
The working power of device connects, and emitter stage is connected with described second switch element, and base stage is connected with described control signal.With this side
It is simple that formula arranges circuit, and cost is relatively low.
Preferably, be provided with between described control signal generative circuit and described first audion the first current-limiting resistance and
First protection diode, described first current-limiting resistance the first end is connected with described control signal generative circuit, and the second end is with described
The positive pole of the first protection diode connects, and the negative pole of described first protection diode is connected with the base stage of described first audion.
Arrange by this way, be possible to prevent the first switch element when damaging, second switch element to be impacted, reduce further and continue
The probability of electrical equipment abnormal, improves the safety of circuit.
Preferably, described second switch element is the second audion, the colelctor electrode of described second audion and described first
Switch element connects, and emitter stage is connected with described ground end, and base stage is connected with described control signal.Circuit letter is set by this way
Single, cost is relatively low.
Preferably, be provided with between described control signal generative circuit and described second audion the second current-limiting resistance and
Second protection diode, described second current-limiting resistance the first end is connected with described control signal generative circuit, and the second end is with described
The positive pole of the second protection diode connects, and the negative pole of described second protection diode is connected with the base stage of described second audion.
Arrange by this way, be possible to prevent during second switch component wear the first switch element is impacted, reduce further and continue
The probability of electrical equipment abnormal, improves the safety of circuit.
Preferably, described control signal generative circuit includes: control unit, and described control unit is configured to generate PWM letter
Number；The first resistance being connected in series and the first electric capacity, described first resistance the first end is connected with described control unit, the second end with
First end of described first electric capacity connects；First diode, the positive pole of described first diode and the second of described first electric capacity
End connects, and negative pole is connected with described first switch element and second switch element；Second diode, bearing of described second diode
Pole is connected with the second end of described first electric capacity, and positive pole is connected with described ground end；Second resistance, the first end of described second resistance
Being connected with the negative pole of described first diode, the second end is connected with described ground end；Second electric capacity, the first end of described second electric capacity
Being connected with the negative pole of described first diode, the second end is connected with described ground end.Arrange by this way, can be believed by PWM
Number control the first switch element and the ON/OFF of second switch element, and when control unit is abnormal, when such as crashing, profit
With acting on every straight of electric capacity, make relay disconnect in time, improve the real-time of the actuating of relay.
The invention also discloses a kind of relay circuit, comprising: main line, in described main line, be provided with relay
Device, described relay has above-mentioned relay drive circuit disclosed in this utility model；Multiple branch roads, in each described branch road
It is provided with load and the branch switch element being connected with described load in series.Arrange by this way, circuit can be improved
Protected effect, and cost is relatively low.
The invention also discloses a kind of relay circuit, it includes multiple branch road, is provided with at each described branch road
Relay and the load being connected in series with described relay, described relay has above-mentioned relay disclosed in this utility model
Drive circuit.Arranging by this way, reliability and the safety of each branch road improve so that the reliability of whole circuit and
Safety is greatly improved.
Accompanying drawing explanation
The drawings below of this utility model embodiment is used for understanding that this practicality is new in this as a part of the present utility model
Type.Shown in the drawings of embodiment of the present utility model and description thereof, it is used for explaining principle of the present utility model.In the accompanying drawings,
Fig. 1 is the structural representation of the relay drive circuit according to this utility model the first embodiment；
Fig. 2 is the circuit diagram of the relay drive circuit shown in Fig. 1；
Fig. 3 is a kind of relay circuit connection diagram according to this utility model the second embodiment；
Fig. 4 is a kind of relay circuit connection diagram according to this utility model the 3rd embodiment.
Description of reference numerals:
10 relays
11 first switch elements
12 second switch elements
13 control signal generative circuits
Detailed description of the invention
In the following description, a large amount of concrete details is given to provide and this utility model being managed the most thoroughly
Solve.It will be apparent, however, to one skilled in the art that this utility model embodiment can be without one or more
These details and be carried out.In other example, in order to avoid obscuring, for ability with this utility model embodiment
The more known technical characteristics in territory are not described.
In order to thoroughly understand this utility model embodiment, detailed structure will be proposed in following description.Obviously, this reality
It is not limited to the specific details that those skilled in the art is familiar with the execution of new embodiment.Of the present utility model preferably
Embodiment is described in detail as follows, but in addition to these describe in detail, this utility model can also have other embodiments.
Embodiment one
Below in conjunction with Fig. 1 and Fig. 2, the relay drive circuit of this utility model one embodiment is described in detail.
As it is shown in figure 1, the present embodiment provides a kind of relay drive circuit, for controlling the Guan Bi of relay 10 and breaking
Opening, this drive circuit includes the first switch element 11, second switch element 12 and control signal generative circuit 13.First switch unit
Part 11, second switch element 12 are connected in series between working power VCC of relay 10 and ground end GND, and control signal generates
Circuit 13 produces control signal and controls the first switch element 11, the turn-on and turn-off of second switch element 12.Only when first
When switch element 11, second switch element 12 simultaneously turn on, electric current is just had to pass through relay 10, so that relay 10 closes,
When the first switch element 11, second switch element 12 have one to turn off, then no current passes through relay 10, and relay 10 breaks
Open.Therefore, even if the first switch element 11, second switch element 12 and control signal generative circuit 13 occurring abnormal, such as
First switch element 11 or second switch element 12 abnormal, control signal generative circuit 13 fault etc., due to other elements
Still normal thus be not result in relay 10 abnormal, i.e. to reduce relay different for the relay drive circuit of the present embodiment
Often the probability of conducting, improves the safety and reliability of circuit.
Fig. 2 is the circuit diagram of the relay drive circuit shown in Fig. 1.Below in conjunction with Fig. 2, continuing of the present embodiment is described
The particular circuit configurations of electrical apparatus driving circuit.
As in figure 2 it is shown, the first audion Q1, the second audion Q2 are connected in series in working power VCC of relay K 101
With between ground end GND, the first audion Q1 is used as the first switch element 10, the second audion Q2 is used as second switch element 11.
The colelctor electrode of the first audion Q1 is connected with working power VCC of relay K 101, emitter stage and the current collection of the second audion Q2
Pole connects, and base stage is connected with control signal generative circuit, and the emitter stage of the second audion Q2 is connected with ground end GND, base stage and control
Signal generating circuit processed connects.
In the present embodiment, control signal generative circuit include control unit, the first resistance R1, the second resistance R2, first
Electric capacity C1, the second electric capacity C2, the first diode D1 and the second diode D2.Control unit is exemplary for single-chip microcomputer, and it is used for giving birth to
Become pwm control signal.First resistance R1 and the first electric capacity C1 is connected in series, and first resistance R1 the first end is with pwm control signal even
Connecing, first end of the second end and the first electric capacity C1 connects.Second end of the first electric capacity C1 and the positive pole of the first diode D1 connect.
The negative pole of the first diode D1 and the base stage of the first audion Q1 and the second audion Q2 connect.The negative pole of the second diode D2 with
Second end of the first electric capacity C1 connects, and positive pole is connected with ground end GND.First end of the second resistance R2 and bearing of the first diode D1
Pole connects, and the second end is connected with ground end GND.First end of the second electric capacity C2 and the negative pole of the first diode D1 connect, the second end
It is connected with ground end GND.
Further, in the present embodiment, in order to improve the safety and reliability of circuit further, at the first audion
The first current-limiting resistance R3 and first protection diode D3 it is provided with, at the second audion Q2 between Q1 and control signal generative circuit
And between control signal generative circuit, it is provided with the second current-limiting resistance R4 and second protection diode D4.First current-limiting resistance R3's
First end of the first end and the second electric capacity C2 connects, and the positive pole of the second end and the first protection diode D3 connects, the first protection two
The negative pole of pole pipe D3 and the base stage of the first audion Q1 connect.First end of the second current-limiting resistance R4 and the first of the second electric capacity C2
End connects, and the positive pole of the second end and the second protection diode D4 connects, the negative pole of the second protection diode D4 and the second audion
The base stage of Q2 connects.
Additionally, in the present embodiment, also it is parallel with the 3rd protection diode D5 at the two ends of relay 10, continues for protection
Electrical equipment 10.
Referring again to Fig. 2, the operation principle of the relay drive circuit of the present embodiment is: single-chip microcomputer produces PWM square wave
Signal, when normally working, PWM square-wave signal is low and high level alternately and repeatedly.When PWM square-wave signal is high level, it is first
First pass through the first resistance R1 to charge to the first electric capacity C1, charge, then to the second electric capacity C2 by the first diode D1 the most again
The two ends of the second electric capacity C2 just have voltage.When PWM square-wave signal is low level, the voltage on the first electric capacity C1 passes through first
Resistance R1 and the second diode D2 electric discharge.The low and high level of PWM square-wave signal is alternately and repeatedly so that the second electric capacity C2 has fixing
Voltage, the most just can drive the first audion Q1 and the second audion Q2 conducting so that relay K 101 closes, KN end and
KL end turns on, and can realize the conducting of relay, completes to the purpose of load acting.When there is no pwm signal, by the second electricity
The effect of resistance R2 makes the enough electricity bleeding off the second electric capacity C2 within the regular hour of the second electric capacity, so that relay K 101 can
Disconnect in time.The relay drive circuit of the present embodiment can timely respond to switch conduction and disconnection, improves real-time.
The reliability of the relay drive circuit of lower surface analysis the present embodiment and safety.
When producing the single chip microcomputer halt of PWM square-wave signal, owing to cannot produce PWM square-wave signal, now PWM port is wanted
High level, or low level, the first electric capacity C1 has the effect every straight-through friendship, makes the second electric capacity C2 cannot be electrically charged, therefore
Cannot make driving the first audion Q1 and the second audion Q2 conducting, relay K 101 just cannot work then.I.e. produce PWM side
The single chip microcomputer halt of ripple signal is not result in relay K 101 abnormal.
As the first audion Q1 or the second audion Q2 Damage by Short Circuit, another audion still can normally work,
Therefore relay K 101 still can normally work.I.e. first audion Q1 or second one of them Damage by Short Circuit of audion Q2
Time, the relay drive circuit of the present embodiment still can normally work, and improves the reliability of circuit.
As the first audion Q1 or the second audion Q2 open circuit breakage, relay K 101 just cannot work, i.e. this enforcement
The relay drive circuit of example will not be because of the first audion Q1 or the second audion Q2 open circuit breakage and abnormal.
When the first audion Q1 is straight-through damage time, be possible to prevent by the first protection diode D3 that the first audion Q1's is straight
The base stage that logical damage causes electric current to pass through the first audion Q1 flows out, and then drives the second audion Q2 to cause by R3 and R4
The improper conducting of relay K 101.Even if therefore straight-through damage occurs in the first audion Q1, also it is not result in that relay K 101 is different
Often conducting.
When the second audion Q2 is straight-through damage time, be possible to prevent by the second protection diode D4 that the second audion Q2's is straight
The base stage that logical damage causes electric current to pass through the second audion Q2 flows out, and then drives the first audion Q1 to cause by R4 and R3
The improper conducting of relay 101.Even if therefore straight-through damage occurs in the second audion Q2, also it is not result in that relay K 101 is abnormal
Conducting.
In summary, the relay drive circuit of this enforcement is opened and can be reduced that semiconductor device is abnormal to be caused continuing to greatest extent
Electrical equipment abnormal work, reduces the probability of relay abnormal so that circuit can be improve by the standard of improper test
Safety criterion and reliability；And owing to being effectively reduced the risk of relay abnormal work, therefore decrease and produce therefrom
Raw serious consequence.
It is understood that be not limited to the physical circuit knot shown in Fig. 2 according to the relay drive circuit of the present embodiment
Structure, but as required, carry out deforming and improving based on relay drive circuit design principle of the present utility model.In addition this reality
Execute the relay drive circuit of example and can apply to heater circuit that multiple circuit, such as cooking apparatus etc. used etc., under
Face combines Fig. 2 and Fig. 3 and illustrates how to use the relay drive circuit of the present embodiment.
Embodiment two
Fig. 3 is a kind of relay circuit connection diagram according to this utility model the second embodiment.As it is shown on figure 3,
The relay circuit of the present embodiment employs the relay drive circuit that embodiment one proposes, and wherein, for brevity, only shows
Go out two ends KL and KN of this circuit relay electrical equipment, and not shown complete circuit as shown in Figure 2.As it is shown on figure 3, the present embodiment
Circuit includes main line and multiple branch road, is wherein provided with relay among main line, and described relay has above-mentioned relay and drives
Galvanic electricity road, is provided with load and branch switch element, such as load C ON1 in each branch road and switch S1 forms the first branch road,
Load C ON 2 and switch S2 form the second branch road, load C ON 3 and switch S3 and form the 3rd branch road, and the quantity of branch road is according to wanting
Ask and be designed, be not limited to three shown in the present embodiment.In the circuit of this embodiment, the electric current of civil power L line passes through relay
Two ends KL, KN of device flow through the load of each branch road such as: CON1, CON2, CON3, and branch switch S1, S2, S3 etc. switch
Element returns to N line, completes the process to load acting.When single-chip microcomputer exception or semiconductor device exception, as previously indicated,
Can cut off main line electric current by disconnecting the relay of KL and KN end the most at once, this relay circuit infrastructure cost is relatively low, and
There is higher reliability and safety.
Embodiment three
Fig. 4 is a kind of relay circuit connection diagram according to this utility model the 3rd embodiment.As shown in Figure 4,
The relay circuit of the present embodiment employs the relay drive circuit that embodiment one proposes, and wherein, for brevity, only shows
Go out two ends KL and KN of this circuit relay electrical equipment, and not shown complete circuit as shown in Figure 2.As shown in Figure 4, the present embodiment
Circuit includes multiple branch road (as a example by only illustrating a branch road in Fig. 4), each branch road is provided with load, such as CON4, and with
The relay of described load in series, described relay has above-mentioned relay drive circuit.The electric current of civil power L line is through relay
Two ends KL and KN flows through load C ON4 and returns to N line, completes the process to load acting.When single-chip microcomputer exception or semiconductor device
Time abnormal, as previously indicated, load power source can be cut off by disconnecting the relay of KL and KN end the most at once.The present embodiment
The each branch road of relay circuit has higher safety and reliability, substantially increases the safety post of whole relay circuit
Accurate.
Unless otherwise defined, the technology of technology used herein and scientific terminology and technical field of the present utility model
The implication that personnel are generally understood that is identical.Term used herein is intended merely to describe concrete enforcement purpose, it is not intended that limit
This utility model processed.The herein presented term such as such as " arrange " both can represent that parts were attached directly to another portion
Part, it is also possible to represent that parts are attached to another parts by middleware.The spy described the most in one embodiment
Levying can individually or be applied to another embodiment in combination with further feature, unless this feature is in this another embodiment
Inapplicable or be otherwise noted.
This utility model is illustrated by above-described embodiment, but it is to be understood that, above-described embodiment is simply
For citing and descriptive purpose, and it is not intended to be limited in described scope of embodiments this utility model.This area skill
Art personnel it is understood that more kinds of variants and modifications can also be made according to teaching of the present utility model, these modification
Within all falling within this utility model scope required for protection with amendment.
Claims (8)
1. a relay drive circuit, for controlling the closed and disconnected of relay, it is characterised in that including:
First switch element, described first switch element is arranged between the working power of described relay and ground end, and joins
It is set on or off under control signal control；
Second switch element, described second switch element is arranged between the working power of described relay and ground end, and with
Described first switch elements in series connects, and described second switch element is configured to turn on or close under described control signal controls
Disconnected, and
Control signal generative circuit, described control signal generative circuit is configured to generate described control signal, to control described
One switch element and the turn-on and turn-off of second switch element.
Relay drive circuit the most according to claim 1, it is characterised in that described first switch element is the one or three pole
Pipe, the colelctor electrode of described first audion is connected with the working power of described relay, emitter stage and described second switch element
Connecting, base stage is connected with described control signal.
Relay drive circuit the most according to claim 2, it is characterised in that in described control signal generative circuit and institute
State and between the first audion, be provided with the first current-limiting resistance and the first protection diode,
Described first current-limiting resistance the first end is connected with described control signal generative circuit, the second end and described first protection two poles
The positive pole of pipe connects, and the negative pole of described first protection diode is connected with the base stage of described first audion.
Relay drive circuit the most according to claim 1, it is characterised in that described second switch element is the two or three pole
Pipe, the colelctor electrode of described second audion is connected with described first switch element, and emitter stage is connected with described ground end, base stage and institute
State control signal to connect.
Relay drive circuit the most according to claim 4, it is characterised in that in described control signal generative circuit and institute
State and between the second audion, be provided with the second current-limiting resistance and the second protection diode,
Described second current-limiting resistance the first end is connected with described control signal generative circuit, the second end and described second protection two poles
The positive pole of pipe connects, and the negative pole of described second protection diode is connected with the base stage of described second audion.
6. according to the relay drive circuit described in claim 1-5 any one, it is characterised in that described control signal generates
Circuit includes:
Control unit, described control unit is configured to generate pwm signal；
The first resistance being connected in series and the first electric capacity, described first resistance the first end is connected with described control unit, the second end
It is connected with the first end of described first electric capacity；
First diode, the positive pole of described first diode is connected with the second end of described first electric capacity, negative pole and described first
Switch element and second switch element connect；
Second diode, the negative pole of described second diode is connected with the second end of described first electric capacity, positive pole and described ground end
Connect；
Second resistance, the first end of described second resistance is connected with the negative pole of described first diode, the second end and described ground end
Connect；
Second electric capacity, the first end of described second electric capacity is connected with the negative pole of described first diode, the second end and described ground end
Connect.
7. a relay circuit, it is characterised in that including:
Main line, is provided with relay in described main line, and described relay has as described in any one in claim 1-6
Relay drive circuit；
Multiple branch roads, are provided with load and the branch switch element being connected with described load in series in each described branch road.
8. a relay circuit, it is characterised in that include multiple branch road, be provided with in each described branch road relay and
The load being connected in series with described relay, described relay has the relay as described in any one in claim 1-6
Device drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620271555.4U CN205752025U (en) | 2016-04-01 | 2016-04-01 | Relay drive circuit and relay circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620271555.4U CN205752025U (en) | 2016-04-01 | 2016-04-01 | Relay drive circuit and relay circuit |
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| Publication Number | Publication Date |
|---|---|
| CN205752025U true CN205752025U (en) | 2016-11-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620271555.4U Active CN205752025U (en) | 2016-04-01 | 2016-04-01 | Relay drive circuit and relay circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183050A (en) * | 2018-02-27 | 2018-06-19 | 厦门芯阳科技股份有限公司 | A kind of high security switch control relay drive circuit |
| CN108224498A (en) * | 2018-02-26 | 2018-06-29 | 广东美的厨房电器制造有限公司 | Electric-control system and bull electric ceramic heaters |
| CN108447734A (en) * | 2018-03-08 | 2018-08-24 | 厦门芯阳科技股份有限公司 | A kind of relay drive circuit and method of high reliability |
| CN109065409A (en) * | 2018-08-30 | 2018-12-21 | 珠海格力电器股份有限公司 | Drive circuit, switch control circuit and cooking utensil |
| CN111599644A (en) * | 2019-02-20 | 2020-08-28 | 珠海恒途电子有限公司 | Controller |
| CN112933499A (en) * | 2021-03-05 | 2021-06-11 | 江西清华实业有限公司 | Intelligent fire extinguishing control module |
-
2016
- 2016-04-01 CN CN201620271555.4U patent/CN205752025U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108224498A (en) * | 2018-02-26 | 2018-06-29 | 广东美的厨房电器制造有限公司 | Electric-control system and bull electric ceramic heaters |
| CN108224498B (en) * | 2018-02-26 | 2024-08-06 | 佛山市顺德区美的电热电器制造有限公司 | Electric control system and multi-head electroceramic stove |
| CN108183050A (en) * | 2018-02-27 | 2018-06-19 | 厦门芯阳科技股份有限公司 | A kind of high security switch control relay drive circuit |
| CN108183050B (en) * | 2018-02-27 | 2023-09-05 | 厦门芯阳科技股份有限公司 | High-safety switch control relay driving circuit |
| CN108447734A (en) * | 2018-03-08 | 2018-08-24 | 厦门芯阳科技股份有限公司 | A kind of relay drive circuit and method of high reliability |
| CN109065409A (en) * | 2018-08-30 | 2018-12-21 | 珠海格力电器股份有限公司 | Drive circuit, switch control circuit and cooking utensil |
| CN111599644A (en) * | 2019-02-20 | 2020-08-28 | 珠海恒途电子有限公司 | Controller |
| CN111599644B (en) * | 2019-02-20 | 2022-06-17 | 珠海恒途电子有限公司 | Controller |
| CN112933499A (en) * | 2021-03-05 | 2021-06-11 | 江西清华实业有限公司 | Intelligent fire extinguishing control module |
| CN112933499B (en) * | 2021-03-05 | 2023-08-15 | 江西清华实业有限公司 | Intelligent fire extinguishing control module |
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