阅读说明：本技术 一种无水干烧检测电路 (Waterless dry-burning detection circuit ) 是由 邓伟滔 于 2019-09-29 设计创作，主要内容包括：本发明公开了一种无水干烧检测电路,包括PWM驱动电路、第一滤波电路、震荡电路、电平比较器U1；其中,PWM驱动电路分别与电平比较器U1和第一滤波电路连接；第一滤波电路分别与震荡电路和电平比较器U1连接；电平比较器U1分别与PWM驱动电路和震荡电路连接。本发明提供的一种无水干烧检测电路,电路结构简单,且能够快速、高效地对雾化片进行无水干烧检测,从而能够有效地防止产品雾化片因为无水干烧而损坏。(The invention discloses a waterless dry burning detection circuit, which comprises a PWM (pulse-width modulation) driving circuit, a first filter circuit, an oscillating circuit and a level comparator U1, wherein the PWM driving circuit is connected with the first filter circuit; the PWM driving circuit is respectively connected with the level comparator U1 and the first filter circuit; the first filter circuit is respectively connected with the oscillating circuit and the level comparator U1; the level comparator U1 is connected to the PWM driving circuit and the oscillator circuit, respectively. The waterless dry-burning detection circuit provided by the invention has a simple circuit structure, and can be used for quickly and efficiently carrying out waterless dry-burning detection on the atomization sheet, so that the atomization sheet of a product can be effectively prevented from being damaged due to waterless dry burning.)

1. A waterless dry burning detection circuit is characterized by comprising a PWM (pulse-width modulation) driving circuit, a first filter circuit, an oscillating circuit and a level comparator U1; wherein the content of the first and second substances,

the PWM driving circuit is respectively connected with the level comparator U1 and the first filter circuit;

the first filter circuit is respectively connected with the oscillating circuit and the level comparator U1;

the level comparator U1 is respectively connected with the PWM driving circuit and the oscillating circuit;

the PWM driving circuit comprises a controller MCU, a driving integrated triode U2, a resistor R1, a resistor R11, a resistor R2, a resistor R22 and a resistor R15; the integrated triode U2 comprises a first triode and a second triode; the emitter of the first triode is grounded, the base of the first triode is connected with the controller MCU through the resistor 1, the resistor R2 is connected with the emitter and the base of the first triode, the collector of the first triode is connected with one end of the resistor R15, the other end of the resistor R15 is connected with the base of the second triode through the resistor R11, and the collector of the second triode is connected with the input end of the first filter circuit; and an emitting electrode of the second triode is connected with the output end of the oscillating circuit, and the resistor R22 is connected to a base electrode and an emitting electrode of the second triode.

2. The waterless dry-fire detection circuit of claim 1, wherein the first filter circuit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R8, a resistor R9, a resistor R21, a capacitor C5, a capacitor C7, and an inductor L1; one end of the resistor R8 is connected with the output end of the PWM driving circuit, the other end of the resistor R8 is connected with the resistor R4, and the other end of the resistor R4 is grounded; one end of the resistor R3 is connected between the resistor R8 and the resistor R4, and the other end of the resistor R3 is sequentially connected with the resistor R9 and the inductor L1; the capacitor C5 is connected with the resistor R4 in parallel; the resistor R21 is connected in parallel with the resistor R3.

3. The waterless dry burning detection circuit as claimed in claim 1, wherein the oscillator circuit comprises a FOG, a capacitor CBC, a capacitor CBE, a capacitor CCE, a capacitor C3, a resistor RB1, a resistor RB2, a transistor QP1, and an inductor L2, wherein one end of the resistor RB1 is connected to one end of an inductor L1 in the first filter circuit through the middle of the resistor CBC and the resistor CBE, the resistor RB2 is connected in parallel to the resistor RB1, the other end of the resistor RB1 is connected to the base of the transistor QP1, the collector of the transistor QP1 is connected to the PWM driving circuit, the emitter of the transistor QP1 is connected to one end of the inductor L3 through the inductor L2, the other end of the inductor L3 is connected to the inverting input terminal of the level comparator, a capacitor C3 is connected between the base and the collector of the transistor QP1, and one end of the FOG is connected to the first filter circuit, the other end of the atomizer FOG is connected with one end of a capacitor CBC, the other end of the capacitor CBC is connected between the inductor L1 and the resistor RB1, one end of the capacitor CBE is connected between the inductor L2 and the inductor L3, the other end of the capacitor CBE is connected to the other end of the capacitor CBC, one end of the capacitor CCE is connected between the inductor L2 and the inductor L3, and the other end of the capacitor CCE is connected with the first filter circuit.

4. The waterless dry-burning detection circuit as claimed in claim 1, further comprising a second filter circuit, wherein said oscillating circuit is connected to said level comparator U1 through said second filter circuit;

the second filter circuit comprises a resistor RA, a resistor R14, a resistor R10, a capacitor E1 and a capacitor C4; one end of the resistor R10 is connected with the output end of the oscillating circuit, the other end of the resistor R10 is connected with one end of the resistor R14, and the other end of the resistor R14 is connected with the inverted input end of the level comparator U1; the resistor RA and the capacitor E1 are connected in parallel across the resistor R10, and the capacitor E1 and the capacitor C4 are connected in parallel across the resistor R14.

5. The waterless dry-fire detection circuit of claim 1, further comprising a third filter circuit, wherein said first filter circuit is connected to said level comparator U1 through said third filter circuit;

the third filter circuit comprises a resistor R5 and a capacitor C7, one end of the resistor R5 is connected with one ends of a resistor R21 and a resistor R9 in the first filter circuit, the other end of the resistor R5 is grounded through the capacitor C7, and the reverse output end of the level comparator U1 is connected between the resistor R5 and the capacitor C7.

Technical Field

The invention relates to the technical field of electronic circuits, in particular to a waterless dry-heating detection circuit.

Background

Many humidifier, champignon machine need be with water atomization to realize the function of humidification or champignon, this type of product is when atomizing water, and water can gradually be exhausted, thereby finally probably leads to dry combustion method to damage the atomizing piece.

Disclosure of Invention

The embodiment of the invention aims to provide a waterless dry-burning detection circuit which can quickly and efficiently detect the dry-burning state of an atomization sheet of a product.

In order to achieve the above object, an embodiment of the present invention provides a waterless dry burning detection circuit, which includes a PWM driving circuit, a first filter circuit, an oscillator circuit, and a level comparator U1; wherein the content of the first and second substances,

the PWM driving circuit is respectively connected with the level comparator U1 and the first filter circuit;

the first filter circuit is respectively connected with the oscillating circuit and the level comparator U1;

the level comparator U1 is respectively connected with the PWM driving circuit and the oscillating circuit;

the PWM driving circuit comprises a controller MCU, a driving integrated triode U2, a resistor R1, a resistor R11, a resistor R2, a resistor R22 and a resistor R15; the integrated triode U2 comprises a first triode and a second triode; the emitter of the first triode is grounded, the base of the first triode is connected with the controller MCU through the resistor 1, the resistor R2 is connected with the emitter and the base of the first triode, the collector of the first triode is connected with one end of the resistor R15, the other end of the resistor R15 is connected with the base of the second triode through the resistor R11, and the collector of the second triode is connected with the input end of the first filter circuit; and an emitting electrode of the second triode is connected with the output end of the oscillating circuit, and the resistor R22 is connected to a base electrode and an emitting electrode of the second triode.

Further, the first filter circuit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R8, a resistor R9, a resistor R21, a capacitor C5, a capacitor C7 and an inductor L1; one end of the resistor R8 is connected with the output end of the PWM driving circuit, the other end of the resistor R8 is connected with the resistor R4, and the other end of the resistor R4 is grounded; one end of the resistor R3 is connected between the resistor R8 and the resistor R4, and the other end of the resistor R3 is sequentially connected with the resistor R9 and the inductor L1; the capacitor C5 is connected with the resistor R4 in parallel; the resistor R21 is connected in parallel with the resistor R3.

Further, the oscillator circuit comprises a FOG, a capacitor CBC, a capacitor CBE, a capacitor CCE, a capacitor C3, a resistor RB1, a resistor RB2, a transistor QP1, and an inductor L2, wherein one end of the resistor RB1 is connected to one end of an inductor L1 in the first filter circuit through the middle of the resistor CBC and the resistor CBE, the resistor RB2 is connected in parallel with the resistor RB1, the other end of the resistor RB1 is connected to the base of the transistor QP1, the collector of the transistor QP1 is connected to the PWM driving circuit, the emitter of the transistor QP1 is connected to one end of the inductor L3 through the inductor L2, the other end of the inductor L3 is connected to the inverting input terminal of the level comparator, the capacitor C3 is connected between the base of the transistor collector QP 39qp 1 and the first filter circuit, and the other end of the FOG is connected to one end of the capacitor CBC, the other end of the capacitor CBC is connected between the inductor L1 and the resistor RB1, one end of the capacitor CBE is connected between the inductor L2 and the inductor L3, the other end of the capacitor CBE is connected to the other end of the capacitor CBC, one end of the capacitor CCE is connected between the inductor L2 and the inductor L3, and the other end of the capacitor CCE is connected to the first filter circuit.

Further, the circuit also comprises a second filter circuit, and the oscillating circuit is connected with the level comparator U1 through the second filter circuit;

the second filter circuit comprises a resistor RA, a resistor B14, a resistor R10, a capacitor E1 and a capacitor C4; one end of the resistor R10 is connected with the output end of the oscillating circuit, the other end of the resistor R10 is connected with one end of the resistor R14, and the other end of the resistor R14 is connected with the inverted input end of the level comparator U1; the resistor RA and the capacitor E1 are connected in parallel across the resistor R10, and the capacitor E1 and the capacitor C4 are connected in parallel across the resistor R14.

Further, the voltage regulator further comprises a third filter circuit, wherein the first filter circuit is connected with the level comparator U1 through the third filter circuit;

the third filter circuit comprises a resistor R5 and a capacitor C7, one end of the resistor R5 is connected with one ends of a resistor R21 and a resistor R9 in the first filter circuit, the other end of the resistor R5 is grounded through the capacitor C7, and the reverse output end of the level comparator U1 is connected between the resistor R5 and the capacitor C7.

The embodiment of the invention aims to provide an anhydrous dry-burning detection circuit which is simple in circuit structure and can quickly and efficiently detect the dry-burning state of an atomizing sheet, so that the atomizing sheet can be effectively prevented from being damaged due to anhydrous dry burning.

Drawings

FIG. 1 is a schematic structural diagram of a waterless dry-heating detection circuit according to an embodiment of the present invention;

fig. 2 is a schematic circuit connection diagram of a waterless dry-heating detection circuit according to an embodiment of the present invention.

Wherein the drawings in the attached drawings of the specification are marked as follows:

101. a PWM drive circuit; 102. a first filter circuit; 103. a second filter circuit; 104. an oscillation circuit; 105. a level comparator U1; 106. and a third filter circuit.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the waterless dry burning detection circuit provided in the present embodiment includes a PWM driving circuit, a first filter circuit, an oscillator circuit, and a level comparator U1; wherein the content of the first and second substances,

the PWM driving circuit is respectively connected with the level comparator U1 and the first filter circuit;

the first filter circuit is respectively connected with the oscillating circuit and the level comparator U1;

the level comparator U1 is respectively connected with the PWM driving circuit and the oscillating circuit;

the PWM driving circuit comprises a controller MCU, a driving integrated triode U2, a resistor R1, a resistor R11, a resistor R2, a resistor R22 and a resistor R15; the integrated triode U2 comprises a first triode and a second triode; the emitter of the first triode is grounded, the base of the first triode is connected with the controller MCU through the resistor 1, the resistor R2 is connected with the emitter and the base of the first triode, the collector of the first triode is connected with one end of the resistor R15, the other end of the resistor R15 is connected with the base of the second triode through the resistor R11, and the collector of the second triode is connected with the input end of the first filter circuit; the emitter of the second triode is connected with the output end of the oscillating circuit, and the resistor R22 is connected with the base and the emitter of the second triode.

In the embodiment of the present invention, it can be understood that the waterless dry-heating detection circuit provided in the embodiment of the present invention is simple, when the waterless dry-heating detection circuit normally works, the controller MCU in the PWM driving circuit 101 outputs a PWM waveform to drive the integrated transistor U2 and the transistor QP1 to be turned on, the entire circuit is in a capacitor three-point free oscillation working state, the level of the reverse input end of the comparator in the level comparator U1105 is a current sampling voltage higher than the current sampling level of the forward input end, the output end of the level comparator U2 is a low level, the controller MCU in the PWM driving circuit 101 determines that the circuit normally works, and the level of the forward input end of the level comparator U1105 changes along with the current sampling level.

When water is exhausted, the characteristics of the atomizing plate are changed, the reverse input end level of the level comparator U1105 is lower than the forward input end level, the output end is high level, the abnormal working state is judged in the PWM driving circuit 101, meanwhile, the PWM control port of the controller MCU outputs low level, so that the drive integrated triode U2 is closed, the base of the triode QP1 is low level, the triode QP1 is closed, the whole circuit cannot meet the oscillation condition, the circuit returns to the standby state, and the waterless dry burning detection of the circuit can be rapidly realized.

Referring to fig. 2, in the embodiment of the invention, the first filter circuit 102 includes a resistor R3, a resistor R4, a resistor R5, a resistor R8, a resistor R9, a resistor R21, a capacitor C5, a capacitor C7, and an inductor L1; one end of the resistor R8 is connected with the output end of the PWM driving circuit 101, the other end of the resistor R8 is connected with the resistor R4, and the other end of the resistor R4 is grounded; one end of the resistor R3 is connected between the resistor R8 and the resistor R4, and the other end of the resistor R3 is sequentially connected with the resistor R9 and the inductor L1; the capacitor C5 is connected with the resistor R4 in parallel; the resistor R21 is connected in parallel with the resistor R3.

Referring to fig. 2, in the embodiment of the present invention, the oscillator circuit 104 includes an atomizing plate FOG, a capacitor CBC, a capacitor CBE, a capacitor CCE, a capacitor C3, a resistor RB1, a resistor RB2, a transistor QP1, and an inductor L2, wherein one end of the resistor RB1 is connected to one end of an inductor L1 in the first filter circuit 102 through a middle between the resistor CBC and the resistor CBE, the resistor RB2 is connected to the resistor RB1 in parallel, the other end of the resistor RB1 is connected to a base of the transistor QP1, a collector of the transistor QP1 is connected to the PWM driving circuit 101, an emitter of the transistor QP1 is connected to one end of the inductor L3 through an inductor L2, the other end of the inductor L3 is connected to an inverting input terminal of the level comparator U1105, the capacitor C3 is connected between the base and the collector of the transistor QP1, one end of the atomizer FOG is connected to the first filter circuit 102, the other end of the atomizer FOG is connected to one end of the capacitor CBC, and the other end of, Between the resistors RB1, one end of the capacitor CBE is connected between the inductor L2 and the inductor L3, the other end of the capacitor CBE is connected to the other end of the capacitor CBC, one end of the capacitor CCE is connected between the inductor L2 and the inductor L3, and the other end of the capacitor CCE is connected to the first filter circuit 102.

Referring to fig. 2, in the embodiment of the present invention, the second filter circuit 103 is further included, and the oscillator circuit 104 is connected to the level comparator U1105 through the second filter circuit 103;

the second filter circuit 103 comprises a resistor RA, a resistor B14, a resistor R10, a capacitor E1 and a capacitor C4; one end of the resistor R10 is connected with the output end of the oscillating circuit 104, the other end of the resistor R10 is connected with one end of the resistor R14, and the other end of the resistor R14 is connected with the reverse input end of the level comparator U1105; the resistor RA and the capacitor E1 are connected in parallel at two ends of the resistor R10, and the capacitor E1 and the capacitor C4 are connected in parallel at two ends of the resistor R14.

Referring to fig. 2, in the embodiment of the present invention, the present invention further includes a third filter circuit 106, and the first filter circuit 102 is connected to the level comparator U1105 through the third filter circuit 106;

the third filter circuit 106 includes a resistor R5 and a capacitor C7, one end of the resistor R5 is connected to one end of the resistor R21 and one end of the resistor R9 in the first filter circuit 102, the other end of the resistor R5 is grounded through the capacitor C7, and the inverted output terminal of the level comparator U1 is connected between the resistor R5 and the capacitor C7.

The embodiment of the invention has the following beneficial effects:

according to the waterless dry burning detection circuit provided by the embodiment of the invention, when water is exhausted, the characteristics of the atomizing sheet are changed, the level of the reverse input end of the level comparator U1105 is lower than the level of the forward input end, the output end is high level, the PWM driving circuit 101 judges that the circuit is in an abnormal working state, and meanwhile, the PWM control port of the controller MCU outputs low level, so that the driving integrated triode U2 is closed, the base of the triode QP1 is low level, the triode QP1 is closed, the whole circuit cannot meet the oscillation condition, and returns to a standby state, and the waterless dry burning detection of the circuit can be quickly realized. The waterless dry-burning detection circuit provided by the invention has the advantages of simple structure, high detection sensitivity and low requirements on devices and atomizing sheets, and can effectively and quickly carry out waterless dry-burning detection on the atomizing sheets, thereby effectively preventing the atomizing sheets from being damaged due to dry burning.

The foregoing is a preferred embodiment of the present invention, and it should be noted that it would be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the principles of the invention, and such modifications and enhancements are also considered to be within the scope of the invention.