CN208705746U - A kind of temperature-control circuit - Google Patents
A kind of temperature-control circuit Download PDFInfo
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- CN208705746U CN208705746U CN201821527308.1U CN201821527308U CN208705746U CN 208705746 U CN208705746 U CN 208705746U CN 201821527308 U CN201821527308 U CN 201821527308U CN 208705746 U CN208705746 U CN 208705746U
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Abstract
The utility model discloses a kind of temperature-control circuits, it includes microcontroller, temperature sensor, blower gear control circuit and adjustable dc voltage circuit, the temperature sensor is connected with microcontroller, for the temperature signal of acquisition to be sent to microcontroller, the microcontroller is connected with the blower gear control circuit, for adjusting the gear of blower according to the temperature signal, the air outlet of the blower connects a wind pipe, a motor-driven valve is provided on the wind pipe, the input terminal and output end of the adjustable dc voltage circuit are connected with the test side of microcontroller and motor-driven valve respectively, voltage modulated for exporting microcontroller controls the aperture of motor-driven valve at adjustable dc voltage.The utility model controls the gear selection of blower by blower gear control circuit, then realizes the specific control to air output by the opening size of control motor-driven valve, to realize the accurate control of temperature in air-cooled situation.
Description
Technical field
It is specially a kind of that blower gear controller is controlled according to temperature the utility model relates to technical field of temperature control.
Background technique
Temperature-control circuit is very widely used, in the control of air-conditioning inner blower, by temperature sensor come monitoring temperature,
Then temperature information is sent to the control that microcontroller carries out blower, cooled down to be realized by air cooling way.In addition, blower
There are three gears for general tool, select suitable gear according to temperature conditions, the existing gear control mode to blower is generally adopted
With the fit system of microcontroller, electronic switch and relay, and the output end control electronic switch of microcontroller
Conducting, to realize the excitation to relay, and then controls the work of some gear, i.e., each gear is separately controlled.It is this
Mode has the following problems: the control of blower gear can only control the specific gear of blower, in other words, can only be according to three gears
There are three types of air-out modes for selection, cannot be precisely controlled to air output, control inaccuracy so as to cause temperature.
Utility model content
For overcome the deficiencies in the prior art, the purpose of this utility model is to provide a kind of temperature-control circuits, lead to
The gear selection of blower gear control circuit control blower is crossed, then is realized by the opening size of control motor-driven valve to air output
Specific control, to realize the accurate control of temperature in air-cooled situation.
To achieve the above object, the utility model provides the following technical solutions:
A kind of temperature-control circuit comprising microcontroller, temperature sensor, blower gear control circuit and straight-adjustable
Galvanic electricity volt circuit, the temperature sensor are connected with microcontroller, for the temperature signal of acquisition to be sent to microcontroller, institute
Microcontroller is stated to be connected with the blower gear control circuit, it is described for adjusting the gear of blower according to the temperature signal
The air outlet of blower connects a wind pipe, is provided with a motor-driven valve, the adjustable dc voltage circuit on the wind pipe
Input terminal and output end be connected respectively with the test side of microcontroller and motor-driven valve, the voltage tune for exporting microcontroller
The aperture of adjustable dc voltage control motor-driven valve is made.
Preferably, the blower gear control circuit include the first electronic switch, the first relay, the second electronic switch,
Second relay, third electronic switch, third relay and equipment power supply；
Wherein, microcontroller pass through respectively the first electronic switch, the second electronic switch, third electronic switch control first after
Electric appliance, the second relay, third relay excitation whether；
First relay includes the first relay coil and the first list with first relay coil cooperation
Double-pole double throw switch, first single-pole double-throw switch (SPDT) include the first movable contact, the first normally closed stationary contact and the first normally opened stationary contact,
First movable contact is connected to equipment power supply, and the first normally closed stationary contact is hanging, and the input terminal of the motor-driven valve is connected to
First normally opened stationary contact；
Second relay includes the second relay coil and the second list with second relay coil cooperation
Double-pole double throw switch, second single-pole double-throw switch (SPDT) include the second movable contact, the second normally closed stationary contact and the second normally opened stationary contact,
Second movable contact is connected to the first normally opened stationary contact, and the second normally opened stationary contact is connected to the terminals of blower middle-grade
Son；
The third relay includes third relay coil and the third list with third relay coil cooperation
Double-pole double throw switch, the third single-pole double-throw switch (SPDT) include third movable contact, the normally closed stationary contact of third and the normally opened stationary contact of third,
The third movable contact is connected to the second normally closed stationary contact, and the normally opened stationary contact of third is connected to the terminals of blower top grade
Son, the normally closed stationary contact of third are connected to the connecting terminal of blower low grade.
Preferably, first electronic switch includes NPN triode Q1 1, resistance R11, the base of the NPN triode Q1 1
Pole is connected to the first control terminal of microcontroller by the resistance R1；The collector of the NPN triode Q1 1 passes through described the
One relay coil is connected to an accessory power supply, the emitter ground connection of the NPN triode Q1 1.First relay coil
On also bridge the anode of diode a D11, the diode D11 and be connected to the collector of NPN triode Q1 1, two pole
The cathode of pipe D11 is connected to accessory power supply.
Preferably, second electronic switch includes NPN triode Q1 2, resistance R12, the base of the NPN triode Q1 2
Pole is connected to the second control terminal of microcontroller by the resistance R12；The collector of the NPN triode Q1 2 passes through described
Second relay coil is connected to an accessory power supply, the emitter ground connection of the NPN triode Q1 2, the second relay line
The anode that diode a D12, the diode D12 are also bridged on circle is connected to the collector of NPN triode Q1 2, and described two
The cathode of pole pipe D12 is connected to accessory power supply.
Preferably, the third electronic switch includes NPN triode Q1 3, resistance R13, the base of the NPN triode Q1 3
Pole is connected to the third control terminal of microcontroller by the resistance R3；The collector of the NPN triode Q1 3 passes through described the
Three relay coils are connected to an accessory power supply, the emitter ground connection of the NPN triode Q1 3, the third relay coil
On also bridge the anode of diode a D13, the diode D13 and be connected to the collector of NPN triode Q1 3, two pole
The cathode of pipe D13 is connected to accessory power supply.
Preferably, the adjustable dc voltage circuit includes PWM controller, filter circuit and amplifying circuit, described micro-
Controller is connected to amplifying circuit by PWM controller, filter circuit, and the microcontroller exports 3.3V DC voltage to PWM
Controller, the PWM controller are modulated the 3.3V DC voltage, generate the initial adjustable DC of a 0~3.3V
Voltage, the initial adjustable dc voltage form final adjustable DC after filter circuit filters and amplifying circuit amplifies
Voltage is connected to the test side of motor-driven valve, and to control the aperture of motor-driven valve, the filter circuit includes phase inverter U1 and filtering
Circuit, the input terminal of the phase inverter U1 are connected to the output end of PWM controller, and the output end of the phase inverter U1 passes through described
Filtering sub-circuit is connected to the input terminal of amplifying circuit.
Preferably, the filtering sub-circuit includes capacitor C1, resistance R1, resistance R2 and capacitor C2, the phase inverter U1
Output end the input terminal of amplifying circuit is connected to via capacitor C1 and resistance R2, the output end of the PWM controller is via institute
The input terminal that resistance R1 is connected to amplifying circuit is stated, one end of the capacitor C2 is connected to the input terminal of resistance R1 and amplifying circuit
Between, the other end of the capacitor C2 is grounded.
Preferably, the amplifying circuit includes amplification sub-circuit and voltage follower circuit, the input of the amplification sub-circuit
End is connected to the output end of filter circuit, and the output end of the amplification sub-circuit exports finally via the voltage follower circuit
Adjustable dc voltage, the amplification sub-circuit include amplifier U2, resistance R3, resistance R4 and resistance R5, the voltage follow electricity
Road includes resistance R6 and NPN triode Q1, and the non-inverting input terminal of the amplifier U2 is connected between resistance R1 and capacitor C2, institute
The emitter of NPN triode Q1 is stated via being grounded after resistance R4 and resistance R5, the inverting input terminal of the amplifier U2 is connected to
Between resistance R4 and resistance R5, the output end of the amplifier U2 is connected to the base stage of NPN triode Q1 through resistance R3, described
The collector of NPN triode Q1 is connected to accessory power supply via resistance R6.
Preferably, the microcontroller is MKW41Z chip.
Preferably, the temperature-control circuit further includes flash memory module, RS485 module and wireless module, described
Flash memory module, RS485 module and wireless module are connect with microcontroller.
Compared with prior art, the utility model temperature-control circuit, the beneficial effect is that:
1, the utility model controls the gear selection of blower by blower gear control circuit, then passes through control motor-driven valve
Opening size realizes the specific control to air output, to realize the accurate control of temperature in air-cooled situation.
2, the utility model controls three gears of blower by three relays with single-pole double-throw switch (SPDT), even if
Three output ends of microcontroller export high level and make three equal excitations of relay, and blower will not be caused two or more
Gear it is in running order, ensure that the normal work of blower, extend the service life of blower.
3, auxiliary control is carried out by switch of the blower gear control circuit to motor-driven valve, motor-driven valve when reaching blower work
It automatically turns on, when blower does not work, purpose that motor-driven valve is automatically closed.
4, it is adulterated in the initial adjustable dc voltage generated by the combination of phase inverter and filtering sub-circuit to PWM controller
AC signal eliminated, leave the simulation output of a relative clean, and then export by amplifying circuit stable adjustable
DC voltage, structure is simple, and performance is considerably beyond RC filter, suitable for the field for needing accurately to control to adjustable dc voltage
Scape.
Detailed description of the invention
Fig. 1 is the structural block diagram of the utility model temperature-control circuit；
Fig. 2 is the circuit diagram of the utility model gear control circuit；
Fig. 3 is the structural block diagram of the utility model adjustable dc voltage circuit；
Fig. 4 is the circuit diagram of filter circuit and amplifying circuit.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the utility model, it should be noted that
Under the premise of not colliding, it can be formed in any combination between various embodiments described below or between each technical characteristic new
Embodiment.
It please refers to shown in Fig. 1, a kind of temperature-control circuit comprising microcontroller, temperature sensor, the control of blower gear
Circuit and adjustable dc voltage circuit, the temperature sensor are connected with microcontroller, the temperature signal hair for that will acquire
It send to microcontroller, the microcontroller is connected with the blower gear control circuit, for being adjusted according to the temperature signal
The gear of blower, the air outlet of the blower connect a wind pipe, are provided with a motor-driven valve on the wind pipe, it is described can
The input terminal and output end of tuning DC potential circuit are connected with the test side of microcontroller and motor-driven valve respectively, are used for microcontroller
The voltage modulated of device output controls the aperture of motor-driven valve at adjustable dc voltage.
Microcontroller uses MKW41Z chip, and carries flash memory module, while passing through wireless module and external equipment
It communicates wirelessly, temperature signal or gear signal is sent to the mobile phone of distal end or management terminal or external equipment pass through
The RS485 interface of RS485 module and the connection of microcontroller, are sent to management equipment for temperature signal or gear signal.24V is straight
Galvanic electricity source exports 3.3V voltage by power conversion module, powers for microcontroller, and power conversion module uses DC-DC circuit,
It mainly include voltage reduction module, filter module and Voltage stabilizing module, 24V DC power supply passes sequentially through voltage reduction module, filter module and steady
Stable 3.3V DC voltage is exported after die block, is powered for microcontroller.Temperature sensor can be passed using DS18B20 temperature
The temperature signal of sensor, temperature sensor acquisition is sent to microcontroller, the output by microcontroller to adjustable dc voltage circuit
Voltage is controlled, and motor-driven valve uses DN20 electric two-way valve, and test side connects the output end of adjustable dc voltage circuit, root
Its aperture is adjusted according to the voltage value of adjustable dc voltage circuit output, so as to adjust air output, achievees the purpose that temperature is adjusted.
Referring to figure 2. shown in, blower gear control circuit it include the first electronic switch, the first relay, the second electronics
Switch, the second relay, third electronic switch, third relay and equipment power supply.
Wherein, three control terminals of microcontroller pass through the first electronic switch, the second electronic switch, third electronic cutting respectively
Whether closing the excitation of the first relay of control, the second relay, third relay.
First relay includes the first relay coil and the first list with first relay coil cooperation
Double-pole double throw switch, first single-pole double-throw switch (SPDT) include the first movable contact A1, the first normally closed stationary contact A3 and first normally opened quiet
Contact A 2, the first movable contact A1 are connected to equipment power supply, and equipment power supply can use 220V AC power source, and described first often
It is hanging to close stationary contact A3.The matching relationship of first relay coil and the first single-pole double-throw switch (SPDT) is: the first relay coil is encouraged
Magnetic, the normally opened stationary contact A2 of the first movable contact A1 and first establish connection, otherwise, the first movable contact A1 always with the first normally closed stationary contact
Point A3 establishes connection, i.e., constitutes open circuit at this time.
Second relay includes the second relay coil and the second list with second relay coil cooperation
Double-pole double throw switch, second single-pole double-throw switch (SPDT) include the second movable contact B1, the second normally closed stationary contact B3 and second normally opened quiet
Contact B2, the second movable contact B1 are connected to the first normally opened stationary contact A2, and the second normally opened stationary contact B2 is connected to blower
The connecting terminal of middle-grade.The matching relationship of second relay coil and the second single-pole double-throw switch (SPDT) is: the second relay coil is encouraged
Magnetic, the normally opened stationary contact B2 of the second movable contact B1 and second establish connection, otherwise, the second movable contact B1 always with the second normally closed stationary contact
Point B3 establishes connection.
The third relay includes third relay coil and the third list with third relay coil cooperation
Double-pole double throw switch, the third single-pole double-throw switch (SPDT) include that third movable contact E1, the normally closed stationary contact E3 of third and third are normally opened quiet
Contact E2, the third movable contact E1 are connected to the second normally closed stationary contact B3, and the normally opened stationary contact E2 of third is connected to blower
High-grade connecting terminal, the normally closed stationary contact E3 of third are connected to the connecting terminal of blower low grade.Third relay coil and
The matching relationship of third single-pole double-throw switch (SPDT) is: third relay coil excitation, third movable contact E1 and the normally opened stationary contact of third
E2 establishes connection, and otherwise, third movable contact E1 establishes connection with the normally closed stationary contact E3 of third always.
Above scheme then only needs to make the first relay coil excitation i.e. if necessary to blower work under low mode
Can, if necessary to blower work under middle-grade mode, then make the first relay and the second relay excitation, if necessary to fanman
Make under high range mode, then makes the first relay and third relay excitation.Even if work is under middle-grade mode, third relay
Excitation will not make blower while be under middle-grade and high-grade both of which, similarly, if blower work is under high range mode
When, the second relay excitation, then blower can be gone under middle-grade mode, and therefore, the output high level situation of microcontroller will not make
It is in running order to obtain the two or more gearing regime of blower.
When blower work Mr. Yu gear when, motor-driven valve must be turned on can outlet air, be also to motor-driven valve in the prior art
Be implemented separately control by microcontroller, this mode to a certain extent, if program is chaotic or other factors cause pair
The control failure of motor-driven valve, then influence the normal work of blower, therefore, in the utility model preferred embodiment, by means of
Motor-driven valve is connected to the described first normally opened stationary contact by foregoing circuit, that is, has equipment power supply for motor-driven valve power supply, as long as in this way,
It is blower work, which must open, and otherwise, as long as blower does not work, which must cause to close because of power loss.
As the utility model preferred embodiment, each electronic switch is made of a NPN triode and resistance, when
So, electronic switch can also be realized using metal-oxide-semiconductor or thyristor.
First electronic switch includes NPN triode Q1 1, resistance R11, and the base stage of the NPN triode Q1 1 passes through institute
State the first control terminal PB0 that resistance R11 is connected to microcontroller；The collector of the NPN triode Q1 1 by described first after
Electric apparatus coil is connected to a 24V DC power supply, the emitter ground connection of the NPN triode Q1 1.First control terminal PB0 output is high
Level, then NPN triode Q1 1 is connected, the first relay coil excitation, and otherwise, the first control terminal PB0 exports low level, then NPN
Triode Q11 cut-off, the first relay coil loss of excitation, in order to avoid the backward voltage pair generated after the first relay coil loss of excitation
NPN triode Q1 1, microcontroller and the damage of other component brings, in the utility model preferred embodiment, first
Also bridging (i.e. diode D11 and the first relay coil are at parallel relationship) one diode D11 on relay coil, described two
The anode of pole pipe D11 is connected to the collector of NPN triode Q1 1, and the cathode of the diode D11 is connected to 24V DC power supply.
Second electronic switch includes NPN triode Q1 2, resistance R112, and the base stage of the NPN triode Q1 2 passes through
The resistance R112 is connected to the second control terminal PB1 of microcontroller；The collector of the NPN triode Q1 2 passes through described the
Two relay coils are connected to a 24V DC power supply, the emitter ground connection of the NPN triode Q1 2.Second control terminal PB1 is defeated
High level out, then NPN triode Q1 2 is connected, the second relay coil excitation, and otherwise, the second control terminal PB1 exports low level,
Then NPN triode Q1 2 is ended, and the second relay coil loss of excitation is reversed in order to avoid generating after the second relay coil loss of excitation
Voltage damages NPN triode Q1 2, microcontroller and other component brings, in the utility model preferred embodiment
In, a diode D12 is also bridged on second relay coil, the anode of the diode D12 is connected to NPN triode
The cathode of the collector of Q12, the diode D12 is connected to 24V DC power supply.
The third electronic switch includes NPN triode Q1 3, resistance R113, and the base stage of the NPN triode Q1 3 passes through
The resistance R113 is connected to the third control terminal PB2 of microcontroller；The collector of the NPN triode Q1 3 passes through described the
Three relay coils are connected to a 24V DC power supply, the emitter ground connection of the NPN triode Q1 3.Third control terminal PB2 is defeated
High level out, then NPN triode Q1 3 is connected, third relay coil excitation, and otherwise, third control terminal PB2 exports low level,
Then NPN triode Q1 3 is ended, and third relay coil loss of excitation is reversed in order to avoid generating after third relay coil loss of excitation
Voltage damages NPN triode Q1 3, microcontroller and other component brings, in the utility model preferred embodiment
In, a diode D13 is also bridged on the third relay coil, the anode of the diode D13 is connected to NPN triode
The cathode of the collector of Q13, the diode D13 is connected to 24V DC power supply.
Shown in referring to figure 3., adjustable DC output circuit includes PWM controller, filter circuit and amplifying circuit, described
Microcontroller is connected to amplifying circuit by PWM controller, filter circuit, and the microcontroller output 3.3V DC voltage is extremely
PWM controller, the PWM controller are modulated the 3.3V DC voltage, generate the initial straight-adjustable of a 0~3.3V
Galvanic electricity pressure, the initial adjustable dc voltage form final straight-adjustable after filter circuit filters and amplifying circuit amplifies
Final adjustable dc voltage is connected to the test side of motor-driven valve by galvanic electricity pressure, thus by microcontroller according to specific temperature
Value adjusts the aperture of motor-driven valve, i.e. adjusting unit time air output, in this way, cooperation blower gear temperature can be obtained it is more smart
True control.
Filter circuit includes phase inverter U1 and filtering sub-circuit, and the input terminal of the phase inverter U1 is connected to PWM controller
Output end, the output end of phase inverter U1 passes through the input terminal that the filtering sub-circuit is connected to amplifying circuit.Phase inverter enhancing
The low pass of the initial adjustable dc voltage of PWM controller, phase inverter can be eliminated and subtract after being combined with filtering sub-circuit
The AC compounent in (major part) initial adjustable dc voltage is gone, the stabilization of initial adjustable dc voltage is ensure that, avoids because handing over
The normal use and damage electronic device for the noise jamming circuit that flow component is formed.
Specifically, the filtering sub-circuit includes capacitor C1, resistance R1, resistance R2 and capacitor shown in referring to figure 4.
The output end of C2, the phase inverter U1 are connected to the input terminal of amplifying circuit, the PWM controller via capacitor C1 and resistance R2
Output end the input terminal of amplifying circuit is connected to via the resistance R1, one end of the capacitor C2 is connected to resistance R1 and puts
Between the input terminal of big circuit, the other end of the capacitor C2 is grounded.
In addition, in order to improve the driving capability of adjustable dc voltage circuit, in the utility model preferred embodiment,
Increase voltage follower circuit in discharge circuit, i.e. amplifying circuit includes amplification sub-circuit and voltage follower circuit, amplification
The input terminal of circuit is connected to the output end of filter circuit, and the output end of the amplification sub-circuit is via the voltage follower circuit
Export final adjustable dc voltage.
Specifically, amplification sub-circuit includes amplifier U2, resistance R3, resistance R4 and resistance R5, institute shown in referring to figure 4.
Stating voltage follower circuit includes resistance R6 and NPN triode Q1, the non-inverting input terminal of the amplifier U2 be connected to resistance R1 and
Between capacitor C2, the emitter of the NPN triode Q1 after resistance R4 and resistance R5 via being grounded, the reverse phase of the amplifier U2
Input terminal is connected between resistance R4 and resistance R5, and the output end of the amplifier U2 is connected to NPN triode Q1 through resistance R3
Base stage, the collector of the NPN triode Q1 is connected to 24V DC power supply via resistance R6.Voltage follower circuit has defeated
Enter the feature that impedance is high, output impedance is low, when input impedance is very high, is equivalent to open front stage circuits (amplification sub-circuit)
Road；When output impedance is very low, a constant pressure source is equivalent to late-class circuit (blower), i.e., output voltage is not by late-class circuit
Impedance influences, therefore, voltage follower circuit are also equipped with buffer action, make to be independent of each other between forward and backward grade circuit.It needs to illustrate
Be: voltage follower circuit can also use amplification factor to substitute for 1 amplifier.
Above embodiment is only preferred embodiments of the present invention, cannot be protected with this to limit the utility model
Range, the variation of any unsubstantiality that those skilled in the art is done on the basis of the utility model and replacement belong to
In the utility model range claimed.
Claims (10)
1. a kind of temperature-control circuit, which is characterized in that it includes microcontroller, temperature sensor, blower gear control circuit
And adjustable dc voltage circuit, the temperature sensor are connected with microcontroller, for the temperature signal of acquisition to be sent to
Microcontroller, the microcontroller are connected with the blower gear control circuit, for adjusting blower according to the temperature signal
Gear, the air outlet of the blower connects a wind pipe, is provided with a motor-driven valve, the straight-adjustable on the wind pipe
The input terminal and output end of galvanic electricity volt circuit are connected with the test side of microcontroller and motor-driven valve respectively, for microcontroller is defeated
Voltage modulated out controls the aperture of motor-driven valve at adjustable dc voltage.
2. temperature-control circuit according to claim 1, which is characterized in that the blower gear control circuit includes first
Electronic switch, the first relay, the second electronic switch, the second relay, third electronic switch, third relay and equipment electricity
Source；
Wherein, microcontroller passes through the first electronic switch, the second electronic switch, third electronic switch the first relay of control respectively
Device, the second relay, third relay excitation whether；
First relay includes the first relay coil and the first hilted broadsword pair with first relay coil cooperation
Throw switch, first single-pole double-throw switch (SPDT) includes the first movable contact, the first normally closed stationary contact and the first normally opened stationary contact, described
First movable contact is connected to equipment power supply, and the first normally closed stationary contact is hanging, and the input terminal of the motor-driven valve is connected to first
Normally opened stationary contact；
Second relay includes the second relay coil and the second hilted broadsword pair with second relay coil cooperation
Throw switch, second single-pole double-throw switch (SPDT) includes the second movable contact, the second normally closed stationary contact and the second normally opened stationary contact, described
Second movable contact is connected to the first normally opened stationary contact, and the second normally opened stationary contact is connected to the connecting terminal of blower middle-grade；
The third relay includes third relay coil and the third hilted broadsword pair with third relay coil cooperation
Throw switch, the third single-pole double-throw switch (SPDT) include third movable contact, the normally closed stationary contact of third and the normally opened stationary contact of third, described
Third movable contact is connected to the second normally closed stationary contact, and the normally opened stationary contact of third is connected to the connecting terminal of blower top grade, institute
State the connecting terminal that the normally closed stationary contact of third is connected to blower low grade.
3. temperature-control circuit according to claim 2, which is characterized in that first electronic switch includes tri- pole NPN
Pipe Q11, resistance R11, the base stage of the NPN triode Q1 1 are connected to the first control terminal of microcontroller by the resistance R1；
The collector of the NPN triode Q1 1 is connected to an accessory power supply, the NPN triode by first relay coil
The emitter of Q11 is grounded, and the anode of diode a D11, the diode D11 are also bridged on first relay coil even
It is connected to the collector of NPN triode Q1 1, the cathode of the diode D11 is connected to accessory power supply.
4. temperature-control circuit according to claim 2, which is characterized in that second electronic switch includes tri- pole NPN
Pipe Q12, resistance R12, the base stage of the NPN triode Q1 2 are connected to the second control of microcontroller by the resistance R12
End；The collector of the NPN triode Q1 2 is connected to an accessory power supply, tri- pole NPN by second relay coil
The emitter of pipe Q12 is grounded, and also bridges a diode D12, the anode of the diode D12 on second relay coil
It is connected to the collector of NPN triode Q1 2, the cathode of the diode D12 is connected to accessory power supply.
5. temperature-control circuit according to claim 2, which is characterized in that the third electronic switch includes tri- pole NPN
Pipe Q13, resistance R13, the base stage of the NPN triode Q1 3 are connected to the third control terminal of microcontroller by the resistance R3；
The collector of the NPN triode Q1 3 is connected to an accessory power supply, the NPN triode by the third relay coil
The emitter of Q13 is grounded, and the anode of diode a D13, the diode D13 are also bridged on the third relay coil even
It is connected to the collector of NPN triode Q1 3, the cathode of the diode D13 is connected to accessory power supply.
6. temperature-control circuit according to claim 1, which is characterized in that the adjustable dc voltage circuit includes PWM
Controller, filter circuit and amplifying circuit, the microcontroller are connected to amplifying circuit by PWM controller, filter circuit,
For the microcontroller output 3.3V DC voltage to PWM controller, the PWM controller adjusts the 3.3V DC voltage
System, generate a 0~3.3V initial adjustable dc voltage, the initial adjustable dc voltage by filter circuit filter and
Final adjustable dc voltage is formed after amplifying circuit amplification, is connected to the test side of motor-driven valve, to control the aperture of motor-driven valve,
The filter circuit includes phase inverter U1 and filtering sub-circuit, and the input terminal of the phase inverter U1 is connected to the defeated of PWM controller
Outlet, the output end of the phase inverter U1 are connected to the input terminal of amplifying circuit by the filtering sub-circuit.
7. temperature-control circuit according to claim 6, which is characterized in that the filtering sub-circuit includes capacitor C1, electricity
Resistance R1, resistance R2 and capacitor C2, the output end of the phase inverter U1 are connected to amplifying circuit via capacitor C1 and resistance R2
Input terminal, the output end of the PWM controller are connected to the input terminal of amplifying circuit via the resistance R1, the capacitor C2's
One end is connected between resistance R1 and the input terminal of amplifying circuit, the other end ground connection of the capacitor C2.
8. temperature-control circuit according to claim 7, which is characterized in that the amplifying circuit include amplification sub-circuit and
The input terminal of voltage follower circuit, the amplification sub-circuit is connected to the output end of filter circuit, described to amplify the defeated of sub-circuit
Outlet exports final adjustable dc voltage via the voltage follower circuit, and the amplification sub-circuit includes amplifier U2, electricity
Hindering R3, resistance R4 and resistance R5, the voltage follower circuit includes resistance R6 and NPN triode Q1, and the amplifier U2's is same
Phase input terminal is connected between resistance R1 and capacitor C2, after the emitter of the NPN triode Q1 is via resistance R4 and resistance R5
Ground connection, the inverting input terminal of the amplifier U2 are connected between resistance R4 and resistance R5, the output end warp of the amplifier U2
Resistance R3 is connected to the base stage of NPN triode Q1, and the collector of the NPN triode Q1 is connected to auxiliary electricity via resistance R6
Source.
9. temperature-control circuit according to claim 1-8, which is characterized in that the microcontroller is MKW41Z
Chip.
10. temperature-control circuit according to claim 1-8, which is characterized in that the temperature-control circuit is also
Including flash memory module, RS485 module and wireless module, the flash memory module, RS485 module and wireless mould
Block is connect with microcontroller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821527308.1U CN208705746U (en) | 2018-09-18 | 2018-09-18 | A kind of temperature-control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821527308.1U CN208705746U (en) | 2018-09-18 | 2018-09-18 | A kind of temperature-control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN208705746U true CN208705746U (en) | 2019-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821527308.1U Active CN208705746U (en) | 2018-09-18 | 2018-09-18 | A kind of temperature-control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115468314A (en) * | 2022-09-08 | 2022-12-13 | 珠海格力电器股份有限公司 | Warm-air machine gear control circuit and warm-air machine |
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2018
- 2018-09-18 CN CN201821527308.1U patent/CN208705746U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115468314A (en) * | 2022-09-08 | 2022-12-13 | 珠海格力电器股份有限公司 | Warm-air machine gear control circuit and warm-air machine |
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