阅读说明：本技术 一种香薰机控制电路 (Champignon machine control circuit ) 是由 吴进坤 唐波 董晓勇 向杨 皮峰 冉亚林 罗鹏 陈轲 毛巧运 王�义 于 2020-06-03 设计创作，主要内容包括：本发明公开了一种香薰机控制电路,包括有MCU、开关控制电路、偏置电路、超声波振荡电路和电压采样电路,所述超声波振荡电路用于产生超声波以使香薰液雾化；所述偏置电路用于为所述超声波振荡电路中的三极管提供基极偏置电流；所述开关控制电路连接于所述偏置电路的输入端与直流电源之间；所述电压采样电路用于检测所述超声波振荡电路中的三极管的基极电压并输出一基极电压信号；所述MCU输出一脉冲控制信号控制所述开关控制电路的通断,且所述MCU根据所述基极电压信号调节所述脉冲控制信号的占空比。本发明无需通过人工调节可调电阻的阻值来调节香薰机功率,去除人为因素影响,大大缩短了生产时间,提高了生产效率,且可控性强。(The invention discloses an aromatherapy machine control circuit, which comprises an MCU (microprogrammed control Unit), a switch control circuit, a bias circuit, an ultrasonic oscillation circuit and a voltage sampling circuit, wherein the ultrasonic oscillation circuit is used for generating ultrasonic waves to atomize aromatherapy liquid; the bias circuit is used for providing base bias current for a triode in the ultrasonic oscillation circuit; the switch control circuit is connected between the input end of the bias circuit and the direct-current power supply; the voltage sampling circuit is used for detecting the base voltage of a triode in the ultrasonic oscillation circuit and outputting a base voltage signal; the MCU outputs a pulse control signal to control the on-off of the switch control circuit, and the MCU adjusts the duty ratio of the pulse control signal according to the base voltage signal. The power of the aromatherapy machine is not required to be adjusted by manually adjusting the resistance value of the adjustable resistor, the influence of human factors is removed, the production time is greatly shortened, the production efficiency is improved, and the controllability is strong.)

1. An aromatherapy machine control circuit, comprising:

an ultrasonic oscillation circuit which generates ultrasonic waves to atomize the aromatherapy liquid;

the bias circuit is used for providing base bias current for a triode in the ultrasonic oscillation circuit;

a switch control circuit connected between the input terminal of the bias circuit and a DC power supply;

the voltage sampling circuit is used for detecting the base voltage of a triode in the ultrasonic oscillation circuit and outputting a base voltage signal;

and the MCU outputs a pulse control signal to control the on-off of the switch control circuit, and adjusts the duty ratio of the pulse control signal according to the base voltage signal.

2. The fragrance machine control circuit of claim 1, wherein: the ultrasonic oscillation circuit comprises an atomizing sheet Y1, an inductor L1, an inductor L2, a triode Q8, a resistor R9, a resistor RB1, a resistor RB2, a capacitor C3, a capacitor CBC, a capacitor CBE and a capacitor CCE, wherein the resistor RB1 and the resistor RB2 are connected in parallel to form a parallel branch, one end of the parallel branch is connected with the output end of the bias circuit sequentially through the inductor L1 and the resistor R9, the other end of the parallel branch is connected with the base electrode of the triode Q8, the collector electrode of the triode Q8 is connected with the direct-current power supply input end, the emitter electrode of the triode Q8 is connected with the negative electrode common end of the ultrasonic oscillation circuit through the inductor L2, the capacitor C3 is connected between the collector electrode of the triode Q8 and the base electrode of the triode Q8, the capacitor CCE is connected between the direct-current power supply input end and the negative electrode common end of the ultrasonic oscillation circuit, and the atomizing, The capacitors CBE are sequentially connected in series, the non-common end of the atomization piece Y1 is connected with the input end of the direct-current power supply, the non-common end of the capacitor CBE is connected with the negative electrode common end of the ultrasonic oscillation circuit, and the common end between the parallel branch and the inductor L1 is connected with the common end between the capacitor CBC and the capacitor CBE.

3. The fragrance machine control circuit of claim 1, wherein: the voltage sampling circuit comprises a resistor R5 and a capacitor C7 which are connected in series, the common end of the resistor R5 and the common end of the capacitor C7 are connected with the MCU, the non-common end of the resistor R5 is connected with the ultrasonic oscillation circuit, and the non-common end of the capacitor C7 is grounded.

4. The fragrance machine control circuit of claim 1, wherein: the aromatherapy machine control circuit further comprises a water shortage detection circuit which is used for detecting the emitter voltage of a triode in the ultrasonic oscillation circuit and outputting a detection result to the MCU, and when the emitter voltage reaches a preset value, the MCU stops outputting the pulse control signal.

5. The fragrance machine control circuit of claim 4, wherein: the water shortage detection circuit comprises an inductor L3, a resistor RA, a resistor R10 and a resistor R14, wherein the inductor L3 is connected with the resistor RA in series, a common end of the inductor L3 and the common end of the resistor RA are connected with the MCU sequentially through the resistor R10 and the resistor R14, a non-common end of the inductor L3 is connected with a negative electrode common end of the ultrasonic oscillation circuit, the non-common end of the resistor RA is grounded, an electrolytic capacitor E1 is connected between the common end of the resistor R10 and the resistor R14 and the ground in parallel, and a capacitor C4 is connected between the non-common end of the resistor R14 and the ground in parallel.

6. The aromatherapy machine control circuit of claim 1, further comprising:

the temperature monitoring circuit is used for detecting the temperature value of a triode in the ultrasonic oscillation circuit in real time and outputting a detection result to the MCU, and when the temperature value of the triode reaches a preset value, the MCU stops outputting the pulse control signal;

and the fan driving circuit is used for driving the fan to work so as to enable the fan to rotate and enable air in the aromatherapy machine to flow.

7. The fragrance machine control circuit of claim 6, wherein: the aromatherapy machine control circuit further comprises a voltage stabilizing power supply circuit, wherein the input end of the voltage stabilizing power supply circuit is connected with a direct current power supply and used for providing stable direct current for the MCU and the temperature monitoring circuit.

8. The fragrance machine control circuit of claim 7, wherein: the stabilized voltage supply circuit comprises a three-terminal voltage regulator U3, a resistor R1, an electrolytic capacitor EC1, a capacitor C1, a capacitor C2 and a capacitor C6, wherein the input end of the three-terminal voltage regulator U3 is connected with the input end of a direct-current power supply through the resistor R1, the electrolytic capacitor EC1 and the capacitor C1 are connected in parallel to the input end of the direct-current power supply, the capacitor C2 is connected in parallel to the input end of the three-terminal voltage regulator U3, and the capacitor C6 is connected in parallel to the output end of the three-terminal voltage regulator U3.

9. The fragrance machine control circuit of claim 7, wherein: the temperature monitoring circuit comprises a thermistor with a negative temperature coefficient, a resistor R34, a resistor R35 and a capacitor C9, wherein the thermistor is connected with the resistor R35 in series, the public end of the thermistor and the public end of the resistor R35 are connected with the MCU through a resistor R34, the non-public end of the thermistor is connected with the output end of the voltage-stabilized power supply circuit, the non-public end of the resistor R35 is grounded, and the capacitor C9 is connected between the public end of the resistor R34 and the public end of the MCU and the ground.

10. The fragrance machine control circuit of claim 6, wherein: the fan driving circuit comprises a triode Q1, a resistor RF0 and a resistor RF1, wherein the base electrode of the triode Q1 is connected with the MCU through a resistor RF0, the emitting electrode of the triode Q1 is grounded, the collecting electrode of the triode Q1 is connected with one end of the fan, the other end of the fan is connected with one end of the resistor RF1, and the other end of the resistor RF1 is connected with the input end of the direct-current power supply.

Technical Field

The invention relates to the technical field of aromatherapy machines, in particular to a control circuit of an aromatherapy machine.

Background

In the application field of aromatherapy machines, most of the current design schemes adopt a traditional self-excited oscillation circuit, namely, an atomization circuit actually works in the state of amplifying and feeding back, and almost all designers adopt a base current adjustable matching complementary circuit to control the atomization amount due to the fact that all models have the parameter of the atomization amount. Due to the difference of the amplification factors of the triodes, the amplification circuit needs to be matched with the amplification factors and parameters of the base current and the triodes when reaching a relatively similar balanced state, almost all designers basically adopt a variable resistor for adjustment when designing the adjustable current, and then the feedback of the coordinated feedback current is utilized to form a complementary circuit.

However, in the production process of the scheme, the current of the variable resistor needs to be adjusted to ensure the consistency of the power, on one hand, the operation is complex, the efficiency is extremely low, in addition, the error is relatively large, the adjustment is often too large or too small, the consistency of the whole batch is poor, the cost is high, the effect is poor, and great troubles are brought to production and manufacturing.

Disclosure of Invention

The invention aims to solve the technical problem of providing the control circuit of the aromatherapy machine, which does not need to adjust the power of the aromatherapy machine by manually adjusting the resistance value of an adjustable resistor, and has high production efficiency and strong controllability.

In order to solve the technical problems, the invention adopts the following technical scheme:

an aromatherapy machine control circuit comprises an MCU, a switch control circuit, a bias circuit, an ultrasonic oscillation circuit and a voltage sampling circuit, wherein the ultrasonic oscillation circuit is used for generating ultrasonic waves to atomize aromatherapy liquid; the bias circuit is used for providing base bias current for a triode in the ultrasonic oscillation circuit; the switch control circuit is connected between the input end of the bias circuit and the direct-current power supply; the voltage sampling circuit is used for detecting the base voltage of a triode in the ultrasonic oscillation circuit and outputting a base voltage signal; the MCU outputs a pulse control signal to control the on-off of the switch control circuit, and the MCU adjusts the duty ratio of the pulse control signal according to the base voltage signal.

Preferably, the ultrasonic oscillation circuit includes an atomizing plate Y1, an inductor L1, an inductor L2, a transistor Q8, a resistor R9, a resistor RB1, a resistor RB2, a capacitor C3, a capacitor CBC, a capacitor CBE and a capacitor CCE, the resistor RB1 and the resistor RB2 are connected in parallel to form a parallel branch, one end of the parallel branch is connected to the output terminal of the bias circuit through the inductor L1 and the resistor R9 in sequence, the other end of the parallel branch is connected to the base of the transistor Q8, the collector of the transistor Q8 is connected to the dc power supply input terminal, the emitter of the transistor Q8 is connected to the negative common terminal of the ultrasonic oscillation circuit through the inductor L2, the capacitor C3 is connected between the collector of the transistor Q8 and the base of the transistor Q8, the capacitor CCE is connected between the dc power supply input terminal and the negative common terminal of the ultrasonic oscillation circuit, and the atomizing plate Y1, The capacitor CBC and the capacitor CBE are sequentially connected in series, a non-common end of the atomization piece Y1 is connected with an input end of a direct-current power supply, a non-common end of the capacitor CBE is connected with a negative electrode common end of the ultrasonic oscillation circuit, and a common end between the parallel branch and the inductor L1 is connected with a common end between the capacitor CBC and the capacitor CBE.

Preferably, the voltage sampling circuit includes a resistor R5 and a capacitor C7 connected in series, a common terminal of the resistor R5 and the capacitor C7 is connected to the MCU, a non-common terminal of the resistor R5 is connected to the ultrasonic oscillation circuit, and a non-common terminal of the capacitor C7 is grounded.

Preferably, the aromatherapy machine control circuit further comprises a water shortage detection circuit, the water shortage detection circuit is used for detecting the emitter voltage of a triode in the ultrasonic oscillation circuit and outputting a detection result to the MCU, and when the emitter voltage reaches a preset value, the MCU stops outputting the pulse control signal.

Preferably, the water shortage detection circuit comprises an inductor L3, a resistor RA, a resistor R10 and a resistor R14, the inductor L3 is connected in series with the resistor RA, a common end of the inductor L3 and the resistor RA is connected with the MCU sequentially through the resistor R10 and the resistor R14, a non-common end of the inductor L3 is connected with a negative electrode common end of the ultrasonic oscillation circuit, the non-common end of the resistor RA is grounded, an electrolytic capacitor E1 is connected in parallel between a common end of the resistor R10 and the resistor R14 and the ground, and a capacitor C4 is connected in parallel between the non-common end of the resistor R14 and the ground.

Preferably, the control circuit of the aromatherapy machine further comprises: the temperature monitoring circuit is used for detecting the temperature value of a triode in the ultrasonic oscillation circuit in real time and outputting a detection result to the MCU, and when the temperature value of the triode reaches a preset value, the MCU stops outputting the pulse control signal; and the fan driving circuit is used for driving the fan to work so as to enable the fan to rotate and enable air in the aromatherapy machine to flow.

Preferably, the aromatherapy machine control circuit further comprises a voltage-stabilizing power supply circuit, wherein the input end of the voltage-stabilizing power supply circuit is connected with the direct-current power supply and is used for providing stable direct current for the MCU and the temperature monitoring circuit.

Preferably, the regulated power supply circuit comprises a three-terminal regulator U3, a resistor R1, an electrolytic capacitor EC1, a capacitor C1, a capacitor C2 and a capacitor C6, wherein an input end of the three-terminal regulator U3 is connected with an input end of a direct-current power supply through the resistor R1, the electrolytic capacitor EC1 and the capacitor C1 are connected in parallel to the input end of the direct-current power supply, the capacitor C2 is connected in parallel to an input end of the three-terminal regulator U3, and the capacitor C6 is connected in parallel to an output end of the three-terminal regulator U3.

Preferably, the temperature monitoring circuit comprises a thermistor with a negative temperature coefficient, a resistor R34, a resistor R35 and a capacitor C9, the thermistor is connected with the resistor R35 in series, the common end of the thermistor and the resistor R35 is connected with the MCU through a resistor R34, the non-common end of the thermistor is connected with the output end of the voltage-stabilized power supply circuit, the non-common end of the resistor R35 is grounded, and the capacitor C9 is connected between the common end of the resistor R34 and the MCU and the ground.

Preferably, the fan driving circuit comprises a transistor Q1, a resistor RF0 and a resistor RF1, wherein a base of the transistor Q1 is connected with the MCU through a resistor RF0, an emitter of the transistor Q1 is grounded, a collector of the transistor Q1 is connected with one end of the fan, the other end of the fan is connected with one end of the resistor RF1, and the other end of the resistor RF1 is connected with a dc power input terminal.

The invention has the beneficial technical effects that: above-mentioned champignon machine control circuit is including voltage sampling circuit, voltage sampling circuit detects the base voltage of the triode in the ultrasonic oscillation circuit and outputs a base voltage signal, MCU basis base voltage signal conditioning pulse control signal's duty cycle, thereby realize the self-adaptability of champignon machine power and adjust, make whole circuit work at dynamic steady state, the uniformity of champignon machine power has been guaranteed, need not to adjust the champignon machine power through the resistance of artifical regulation adjustable resistance, get rid of the human factor influence, process production time has been shortened greatly, the production efficiency of champignon machine has been improved, and the product controllability is strong.

Drawings

FIG. 1 is a block diagram of the control circuit of the aromatherapy machine of the present invention;

FIG. 2 is a pin diagram of the MCU of the present invention;

FIG. 3 is a circuit schematic of the regulated power supply circuit of the present invention;

FIG. 4 is a schematic circuit diagram of the switch control circuit, the bias circuit, the ultrasonic oscillation circuit, the voltage sampling circuit and the water shortage detection circuit of the present invention;

FIG. 5 is a schematic circuit diagram of a fan driving circuit according to the present invention;

FIG. 6 is a circuit schematic of the temperature monitoring circuit of the present invention;

FIG. 7 is a schematic circuit diagram of a backlight color conversion circuit according to the present invention;

FIG. 8 is a schematic circuit diagram of a key and an indication circuit according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood by those skilled in the art, the present invention is further described with reference to the accompanying drawings and examples.

As shown in fig. 1, in an embodiment of the present invention, the aromatherapy machine control circuit includes an MCU10, a switch control circuit 20, a bias circuit 30, an ultrasonic oscillation circuit 40, a voltage sampling circuit 50, and a regulated power supply circuit 90, wherein an input terminal of the regulated power supply circuit 90 is connected to a dc power supply 101 for providing a stable dc power to the MCU 10; the ultrasonic oscillation circuit 40 is used for generating ultrasonic waves to atomize the aromatherapy liquid; the bias circuit 30 is used for providing base bias current for the triode in the ultrasonic oscillation circuit 40; the switch control circuit 20 is connected between the input end of the bias circuit 30 and the direct current power supply 101; the voltage sampling circuit 50 is configured to detect a base voltage of a transistor in the ultrasonic oscillation circuit 40 and output a base voltage signal; the MCU10 outputs a pulse control signal to control the on-off of the switch control circuit 20, and the MCU10 adjusts the duty ratio of the pulse control signal according to the base voltage signal.

As shown in fig. 1, the dc power supply 101 in this embodiment is a +24V dc power supply.

As shown in fig. 2, the MCU10 in this embodiment employs a chip with a model CMS89F 113.

As shown IN fig. 3, the regulated power supply circuit 90 includes a three-terminal regulator U3, a resistor R1, an electrolytic capacitor EC1, a capacitor C1, a capacitor C2 and a capacitor C6, an input terminal IN of the three-terminal regulator U3 is connected to a dc power supply input terminal +24V through the resistor R1, the dc power supply input terminal +24V is connected to the dc power supply 101 to input a 24V dc voltage, the electrolytic capacitor EC1 and the capacitor C1 are connected IN parallel to the dc power supply input terminal +24V, the capacitor C2 is connected IN parallel to the input terminal IN of the three-terminal regulator U3, and the capacitor C6 is connected IN parallel to an output terminal OUT of the three-terminal regulator U3. The three-terminal voltage regulator U3 adopts a 78L05 type chip and provides stable 5V working voltage VDD for the MCU 10.

As shown in fig. 4, the bias circuit 30 includes a resistor R3, a resistor R4, a resistor R8, a resistor R21, and an electrolytic capacitor EC3, the resistor R8 is connected in series with the resistor R4, the resistor R3 is connected in parallel with the resistor R21, one end of the resistor R3 connected in parallel with the resistor R21 is connected to a common terminal of the resistor R8 and the resistor R4, the other end of the resistor R3 connected in parallel with the resistor R21 is connected to the ultrasonic oscillation circuit 40, a non-common terminal of the resistor R8 is connected to the switch control circuit 20, and the electrolytic capacitor EC3 is connected in parallel with the resistor R4. The resistor R8 and the resistor R4 are voltage dividing resistors, the resistor R3 and the resistor R21 are current limiting resistors, and the resistor R8 and the resistor R4 divide an input 24V direct current voltage to obtain a voltage VB, so that a base bias current is provided for a triode in the ultrasonic oscillation circuit 40.

As shown in fig. 4, the ultrasonic oscillation circuit 40 includes an atomizing plate Y1, an inductor L1, an inductor L2, a transistor Q8, a resistor R9, a resistor RB1, a resistor RB2, a capacitor C3, a capacitor CBC, a capacitor CBE, and a capacitor CCE, the resistor RB1 and the resistor RB2 are connected in parallel to form a parallel branch, one end of the parallel branch is connected to the output terminal of the bias circuit 30 through the inductor L1 and the resistor R9 in sequence, the other end of the parallel branch is connected to the base of the transistor Q8, the collector of the transistor Q8 is connected to the dc power supply input terminal +24V, the emitter of the transistor Q8 is connected to the negative common terminal of the ultrasonic oscillation circuit 40 through the inductor L2, the capacitor C3 is connected between the collector of the transistor Q8 and the base of the transistor Q8, the capacitor CCE is connected between the dc power supply input terminal +24V and the negative common terminal of the ultrasonic oscillation circuit 40, the atomization piece Y1, the capacitor CBC and the capacitor CBE are sequentially connected in series, a non-common end of the atomization piece Y1 is connected with +24V of a direct-current power supply input end, a non-common end of the capacitor CBE is connected with a negative electrode common end of the ultrasonic oscillation circuit 40, a common end between the parallel branch and the inductor L1 is connected with a common end between the capacitor CBC and the capacitor CBE, and the +24V of the direct-current power supply input end is connected with the direct-current power supply 101 to input 24V direct-current voltage.

As shown in fig. 4, the voltage sampling circuit 50 includes a resistor R5 and a capacitor C7 connected in series, a common terminal of the resistor R5 and the capacitor C7 is connected to the 15 th pin of the MCU10, a non-common terminal of the resistor R5 is connected to the ultrasonic oscillation circuit 40, and a non-common terminal of the capacitor C7 is grounded.

The working engineering of the aromatherapy machine control circuit is as follows:

the MCU10 outputs a PWM signal AROMA, when the PWM signal AROMA is at a high level, the switch control circuit 20 is turned on, so that the path between the input terminal of the bias circuit 30 and the dc power supply 101 is turned on, and when the PWM signal AROMA is at a low level, the switch control circuit 20 is turned off, so that the path between the input terminal of the bias circuit 30 and the dc power supply 101 is turned off. 24V direct-current voltage input by the direct-current power supply 101 is divided by a resistor R8 and a resistor R4 to obtain voltage VB, and the voltage VB provides base bias current for a triode Q8 through a path of a resistor R21, a resistor R3, a resistor R9, an inductor L1, a resistor RB1, a resistor RB2, a triode Q8, an inductor L2 and an inductor L3, so that an oscillating circuit consisting of an atomizing sheet Y1, a capacitor CBC, a capacitor CBE, a capacitor CCE and a triode Q8 generates sine waves; the sine wave at point QB is smoothed by inductor L1 and an RC circuit consisting of resistor R9, resistor R5 and resistor C7 to a smooth dc current. The MCU10 detects the voltage of the VBB point, the detection result is compared with a preset threshold value, the MCU10 adjusts the duty ratio of the PWM signal AROMA according to the comparison result so as to achieve the purpose of adjusting the base electrode bias current of the triode Q8, and therefore the self-adaptive adjustment of the power of the aromatherapy machine is achieved.

The control circuit of the aromatherapy machine comprises a voltage sampling circuit 50, wherein the voltage sampling circuit 50 detects the base voltage of a triode in an ultrasonic oscillation circuit 40 and outputs a base voltage signal, and an MCU10 adjusts the duty ratio of a pulse control signal according to the base voltage signal, so that the self-adaptive adjustment of the power of the aromatherapy machine is realized, the whole circuit works in a dynamic stable state, the consistency of the power of the aromatherapy machine is ensured, the power of the aromatherapy machine is not required to be adjusted by manually adjusting the resistance value of an adjustable resistor, the influence of human factors is removed, the production time of a manufacturing process is greatly shortened, the production efficiency of the aromatherapy machine is improved, and the controllability of the product is strong.

As shown in fig. 1, in a preferred embodiment of the present invention, the aromatherapy machine control circuit further includes a water shortage detection circuit 60, which is used for detecting the emitter voltage of the transistor Q8 in the ultrasonic oscillation circuit 40 and outputting the detection result to the MCU10, and when the emitter voltage reaches a preset value, the MCU10 stops outputting the pulse control signal.

As shown in fig. 4, the water shortage detection circuit 60 includes an inductor L3, a resistor RA, a resistor R10, and a resistor R14, the inductor L3 is connected in series with the resistor RA, a common end of the inductor L3 and the resistor RA is connected to the 14 th pin of the MCU10 sequentially through a resistor R10 and a resistor R14, a non-common end of the inductor L3 is connected to a negative electrode common end of the ultrasonic oscillation circuit 40, a non-common end of the resistor RA is grounded, an electrolytic capacitor E1 is connected in parallel between a common end of the resistor R10 and the resistor R14 and the ground, and a capacitor C4 is connected in parallel between the non-common end of the resistor R14 and the ground. When the aromatherapy machine is lack of water and is dried, the working current in the ultrasonic oscillation circuit 40 can rise rapidly, the 14 th pin of the MCU10 receives the detection result of the emitter voltage output by the water shortage detection circuit 60, the emitter voltage is compared with a preset threshold value, when the emitter voltage reaches the threshold value, the MCU10 stops outputting the PWM signal AROMA, the aromatherapy machine is shut down, and therefore the purpose of protecting the aromatherapy machine is achieved.

As shown in FIG. 1, in a preferred embodiment of the present invention, the aromatherapy control circuit further comprises a fan driving circuit 80. As shown in fig. 5, the fan driving circuit 80 includes a transistor Q1, a resistor RF0, and a resistor RF1, wherein a base of the transistor Q1 is connected to the 13 th pin of the MCU10 through a resistor RF0, an emitter of the transistor Q1 is grounded, a collector of the transistor Q1 is connected to one end of the fan, the other end of the fan is connected to one end of the resistor RF1, the other end of the resistor RF1 is connected to a dc power input terminal +24V, and the dc power input terminal +24V is connected to the dc power supply 101 to input 24V dc voltage. The Fan drive circuit 80 drives the Fan to work according to a control signal Fan from the MCU10, so that the Fan rotates to enable air inside the aromatherapy machine to flow, atomized aromatherapy is blown out of the aromatherapy machine from the inside of the aromatherapy machine by the air flow, and meanwhile the heat of the power triode Q8 can be taken away by the air flow to achieve the purpose of heat dissipation.

As shown in FIG. 1, in a preferred embodiment of the present invention, the aromatherapy control circuit further comprises a temperature monitoring circuit 70. As shown in fig. 6, the temperature monitoring circuit 70 includes a thermistor NTC with a negative temperature coefficient, a resistor R34, a resistor R35, and a capacitor C9, the thermistor NTC is connected in series with the resistor R35, a common terminal of the thermistor NTC and the resistor R35 is connected to the 9 th pin of the MCU10 through a resistor R34, a non-common terminal of the thermistor NTC is connected to the output terminal of the regulated power supply circuit 90, a non-common terminal of the resistor R35 is grounded, and the capacitor C9 is connected between the common terminal of the resistor R34 and the MCU10 and the ground.

The temperature monitoring circuit 70 detects the temperature value of the transistor Q8 in the ultrasonic oscillation circuit 40 in real time and outputs the temperature value to the MCU10, and when the temperature value of the transistor Q8 reaches a preset value, the MCU10 stops outputting the pulse control signal. The thermistor NTC sets up on triode Q8's surface, and the resistance of thermistor NTC changes along with triode Q8's temperature variation, and MCU10 detects triode Q8's temperature value through the voltage that detects the 9 th foot, and when triode Q8's temperature value reached the settlement threshold value, MCU10 stopped output PWM signal AROMA, shuts down the champignon machine, avoids burning out triode Q8 to reach the mesh of protection champignon machine.

As shown in FIG. 1, in a preferred embodiment of the present invention, the aromatherapy machine control circuit further comprises a backlight color conversion circuit 100. As shown in fig. 7, the backlight color changing circuit 100 includes a color mixing and dimming circuit and a single color tone circuit. The color mixing photoelectric circuit is composed of a Darlington tube U5 with the model number of ULN2001DS, an LED1, an LED2, an LED3, an LED4, an LED5 and an LED6 which are sequentially connected in series, the LED1, the LED2, the LED3, the LED4, the LED5 and the LED6 are RGB units, and the MCU10 outputs three control signals (MCU _ R, MCU _ G, MCU _ B) to the Darlington tube U5, so that the dimming of the color mixing dimming circuit is realized. The single-tone photoelectric circuit comprises an LED7, an LED8, an LED9, an LED10, an LED11, an LED12, a triode Q4, a resistor R18, a resistor R19 and a resistor R25, wherein the LED7, the LED8, the LED9, the LED10, the LED11 and the LED12 are light emitting diodes capable of emitting white light, the MCU10 outputs a control signal (MCU _ W) to the triode Q4, the MCU _ W is a PWM signal, and dimming of the single-tone photoelectric circuit is achieved by adjusting the duty ratio of the MCU _ W.

As shown in FIG. 1, in a preferred embodiment of the present invention, the aromatherapy machine control circuit further comprises a key and an indication circuit 110. Specifically, as shown in fig. 8, the button and indication circuit 110 includes a button K1, a button K2, a light emitting diode LED13, a light emitting diode LED14, a light emitting diode LED15, a resistor R30, a resistor R31, a resistor RL1, a resistor RL2, and a resistor RL 3.

The 2 nd pin (K1) of the MCU10 and the 3 rd pin (K2) of the MCU10 are multiplexed in a time sharing mode, and when a control instruction is input to the MCU10 by pressing the key K1 and the key K2, functions of timing setting, power-on control, power-off control and the like can be achieved. When the MCU10 outputs signals to light the light emitting diode LED13, the light emitting diode LED14 and the light emitting diode LED15, the working state of the aromatherapy machine can be indicated.

The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Various equivalent changes and modifications can be made by those skilled in the art based on the above embodiments, and all equivalent changes and modifications within the scope of the claims should fall within the protection scope of the present invention.