Atomizer control circuit and atomizer device

Abstract

The present application relates to a control circuit for an atomizer sheet, including a controller, a first switch tube, a second switch tube, a first bias resistor, a second bias resistor and a transformer, wherein the transformer includes a primary winding and a secondary winding. After the transformer is connected to a power supply, due to the different resistance values ​​of the first bias resistor and the second bias resistor, a potential difference is formed between the first tap and the second tap of the primary winding, and the voltage on the secondary winding is fed back to the first switch tube and the second switch tube, so that one of the two switch tubes is turned on and the other is turned off, and the equivalent capacitance of the atomizer sheet switches between charging and discharging states, and energy is repeatedly transmitted between the primary winding and the equivalent capacitance of the atomizer sheet, so that the circuit operation tends to be stable within a certain frequency range and enters a resonant state. The circuit can make the atomizer sheet work within a certain range, form uniform and stable atomized particles, improve the atomization effect, and thus improve the reliability of the atomizer sheet.

Description

Technical Field

[0001] The present application relates to the technical field of atomizers, and in particular to an atomizer sheet control circuit and an atomizer device. Background Art

[0002] A nebulizer is an instrument that atomizes the test solution. There are many types of nebulizers, which can be roughly divided into air humidifiers, medical nebulizers and other types of nebulizers according to their different uses. They have a wide range of uses. The nebulizer includes a nebulizer, a water-absorbing cotton strip and a power supply. When working, the water-absorbing cotton strip uses capillary phenomenon to connect the water in the water cup to the nebulizer. The power supply provides high-frequency AC voltage to vibrate the metal sheet. There are tiny holes in the center area of ​​the metal sheet, which hit the cotton strip, causing water to spray out from the hole to form atomized particles.

[0003] Traditional atomizers generate vibrations through high-frequency AC voltage provided by the power supply, thereby atomizing water. However, when the AC voltage provided by the power supply is inappropriate or unstable, it may cause the metal sheet to vibrate disorderly, resulting in unstable spray, uneven atomized particles, and poor atomization effect. Summary of the invention

[0004] Aiming at the problem that the conventional atomizer sheet has poor atomization effect, the present invention proposes an atomizer sheet control circuit and an atomizer device, which can achieve the technical effect of improving the reliability of the atomizer.

[0005] An atomizer sheet control circuit includes a controller, a first switch tube, a second switch tube, a first bias resistor, a second bias resistor and a transformer, wherein the transformer includes a primary winding and a secondary winding;

[0006] The first end of the first switch tube and the first end of the second switch tube are both connected to the controller, the control end of the first switch tube is connected to the control end of the second switch tube through the first bias resistor and the second bias resistor in sequence, and the first bias resistor and the second bias resistor have different resistance values;

[0007] The second end of the first switch tube is connected to the first tap of the primary winding and is also used to connect the first lead of the atomizer sheet. The second end of the second switch tube is connected to the second tap of the primary winding and is also used to connect the second lead of the atomizer sheet. The third tap of the primary winding is used to connect to the power supply. The third tap of the primary winding is located between the first tap of the primary winding and the second tap of the primary winding.

[0008] A common end of the first bias resistor and the control end of the first switch tube is connected to a first tap of the secondary winding, and a common end of the second bias resistor and the control end of the second switch tube is connected to a second tap of the secondary winding.

[0009] An atomizer device comprises an atomizer sheet and the atomizer sheet control circuit as described above.

[0010] The above-mentioned atomizer sheet control circuit and atomizer device include a controller, a first switch tube, a second switch tube, a first bias resistor, a second bias resistor and a transformer. The transformer includes a primary winding and a secondary winding. Based on the connection relationship between these devices, after the transformer is connected to the power supply, due to the different resistance values ​​of the first bias resistor and the second bias resistor, the current at the second end of the first switch tube and the second end of the second switch tube are different, thereby forming a potential difference between the first tap and the second tap of the primary winding of the transformer, and forming an induced electromotive force on the secondary winding of the transformer. The voltage on the secondary winding of the transformer is fed back to the first switch tube and the second switch tube, so that the two switch tubes are turned on and off back and forth, and the equivalent capacitance of the atomizer sheet switches between charging and discharging states. The primary winding of the transformer and the equivalent capacitance of the atomizer sheet form a current loop, and energy is repeatedly transmitted between the primary winding and the equivalent capacitance of the atomizer sheet, so that the circuit operation tends to be stable within a certain frequency range and enters a resonant state. The circuit can make the atomizer work within a certain range, form uniform and stable atomized particles, improve the atomization effect, and thus improve the reliability of the atomizer.

[0011] In one embodiment, the atomizer control circuit further includes a third switch tube, the control end of the third switch tube is connected to the controller, the first end of the first switch tube and the first end of the second switch tube are both connected to the second end of the third switch tube, and the first end of the third switch tube is grounded.

[0012] In one embodiment, the atomizer control circuit further includes a current limiting resistor, and the controller is connected to the control end of the third switch tube via the current limiting resistor.

[0013] In one of the embodiments, the atomizer control circuit further includes a diode, wherein an anode of the diode is used to access a power supply, and a cathode of the diode is connected to a third tap of the primary winding.

[0014] In one of the embodiments, the atomizer control circuit further includes an inductor, one end of the inductor is used to be connected to a power supply, and the other end of the inductor is connected to the third tap of the primary winding.

[0015] In one of the embodiments, the third tap of the primary winding is located between the first tap of the primary winding and the second tap of the primary winding.

[0016] In one embodiment, both the first switch tube and the second switch tube are triodes.

[0017] In one embodiment, parameters of the first switch tube and the second switch tube match.

[0018] In one embodiment, the transformer is a high frequency transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of an atomizer control circuit in one embodiment;

[0020] Figure 2 is an equivalent circuit diagram of a primary winding in one embodiment;

[0021] Figure 3 A structural diagram of an atomizer sheet control circuit in one embodiment;

[0022] Figure 4 An equivalent circuit diagram of a transformer before decoupling in one embodiment;

[0023] Figure 5 An equivalent circuit diagram of a transformer after decoupling in one embodiment;

[0024] Figure 6 FIG. 1 is a first process resonance equivalent schematic diagram of an atomizer plate control circuit in an embodiment. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is described more comprehensively below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] In one embodiment, an atomizer control circuit is provided. Figure 1, including a controller 100, a first switch tube 210, a second switch tube 220, a first bias resistor R1, a second bias resistor R2 and a transformer T1, the transformer T1 includes a primary winding and a secondary winding, the first end of the first switch tube 210 and the first end of the second switch tube 220 are both connected to the controller 100, the control end of the first switch tube 210 is connected to the control end of the second switch tube 220 through the first bias resistor R1 and the second bias resistor R2 in sequence, the first bias resistor R1 and the second bias resistor R2 have different resistance values, and the second end of the first switch tube 210 The first tap of the primary winding is connected and is also used to connect the first lead of the atomizer sheet. The second end of the second switch tube 220 is connected to the second tap of the primary winding and is also used to connect the second lead of the atomizer sheet. The third tap of the primary winding is used to access the power supply. The third tap of the primary winding is located between the first tap of the primary winding and the second tap of the primary winding. The common end of the first bias resistor R1 and the control end of the first switch tube 210 is connected to the first tap of the secondary winding. The common end of the second bias resistor R2 and the control end of the second switch tube 220 is connected to the second tap of the secondary winding. Based on the connection relationship of these devices, after the transformer T1 is connected to the power supply, due to the different resistance values ​​of the first bias resistor R1 and the second bias resistor R2, the current at the second end of the first switch tube 210 and the second end of the second switch tube 220 is different, thereby forming a potential difference between the first tap and the second tap of the primary winding of the transformer T1, and forming an induced electromotive force on the secondary winding of the transformer T1, which is fed back to the first switch tube 210 and the second switch tube 220 through the voltage on the secondary winding of the transformer T1, so that the two switch tubes are turned on and off back and forth, and the equivalent capacitance of the atomizer sheet switches the charging and discharging state, and the primary winding of the transformer T1 and the equivalent capacitance of the atomizer sheet form a current loop, and energy is repeatedly transmitted between the primary winding and the equivalent capacitance of the atomizer sheet, so that the circuit operation tends to be stable within a certain frequency range and enters a resonant state. The circuit can make the atomizer sheet work within a certain range, form uniform and stable atomized particles, improve the atomization effect, and thus improve the reliability of the atomizer sheet.

[0027] Specifically, the atomizer control circuit can be used in the atomizer, connected to the atomizer in the atomizer, and used to control the operation of the atomizer. The controller 100 in the atomizer control circuit can use the controller 100 that is already in the atomizer, connect the relevant structure of the atomizer control circuit to the controller 100, and add the relevant functions of the atomizer control circuit to the original functions of the controller 100 to save hardware costs. Alternatively, the controller 100 in the atomizer control circuit can also be a newly added controller 100, which does not affect the function of the original controller 100 in the atomizer and improves the accuracy of control. The controller 100 connects the first end of the first switch and the first end of the second switch tube 220. The controller 100 can send high and low levels to the first end of the first switch tube 210 and the first end of the second switch tube 220, thereby controlling whether the atomizer control circuit works. The type of controller 100 is not unique. In this embodiment, the controller 100 can be a single-chip microcomputer, and the single-chip microcomputer can be powered by a 5V power supply to ensure working performance.

[0028] The control end of the first switch tube 210 is connected to the control end of the second switch tube 220 through the first bias resistor R1 and the second bias resistor R2 in sequence, that is, the control end of the first switch tube 210 is connected to the first bias resistor R1, and the control end of the second switch tube 220 is connected to the second bias resistor R2. The first bias resistor R1 and the second bias resistor R2 make the voltage of the first end of the first switch tube 210 and the first end of the second switch tube 220 lower when there is no driving signal, making the circuit more reliable. The resistance values ​​of the first bias resistor R1 and the second bias resistor R2 are different. Due to the asymmetry of the first bias resistor R1 and the second bias resistor R2, the maximum current at the second end of the first switch tube 210 and the maximum current at the second end of the second switch tube 220 are different, and the differential of the current is also different in the same time. In addition, the second end of the first switch tube 210 is connected to the first tap of the primary winding, and the second end of the second switch tube 220 is connected to the second tap of the primary winding, so a voltage difference is formed between the first tap and the second tap of the primary winding. It can be understood that the first tap of the primary winding can be the beginning tap of the primary winding, and the second tap of the primary winding can be the end tap of the primary winding, that is, the entire primary winding is included between the first tap and the second tap of the primary winding. Alternatively, in other embodiments, the first tap and the second tap of the primary winding can also be taps in the middle of the primary winding, and the winding between the first tap and the second tap of the primary winding is the winding put into use.

[0029] The third tap of the primary winding is used to connect to the power supply, which is also the power supply for the atomizer control circuit. The size of the power supply is not unique. In the present embodiment, the power supply can be a power supply that provides a 12V voltage. The third tap of the primary winding is located between the first tap of the primary winding and the second tap of the primary winding, dividing the primary winding into two parts. Since both the primary winding and the secondary winding of the transformer T1 can be equivalent to inductors, the third tap of the primary winding divides the primary winding into two inductors. The equivalent inductance between the first tap and the third tap is called the first primary winding equivalent inductance, and the equivalent inductance between the second tap and the third tap is called the second primary winding equivalent inductance. The equivalent circuit diagram of the primary winding can be found in. Figure 2 . The first tap of the primary winding is also used to connect the first lead of the atomizer sheet, and the second tap of the primary winding is also used to connect the second lead of the atomizer sheet. The atomizer sheet can be equivalent to a capacitor, and different atomizer sheets can be equivalent to equivalent capacitors with different capacitance values. The first lead and the second lead of the atomizer sheet can be respectively regarded as the two ends of the atomizer sheet equivalent capacitor C1, that is, the end of the first primary winding equivalent inductance that is not connected to the power supply is connected to the first end of the atomizer sheet equivalent capacitor C1, and the end of the second primary winding equivalent inductance that is not connected to the power supply is connected to the second end of the atomizer sheet equivalent capacitor C1.

[0030] After a voltage difference is formed between the first tap and the second tap of the primary winding, an induced electromotive force is formed on the secondary winding of the transformer T1, and the control end of the first switch tube 210 is connected to the first tap of the secondary winding, and the common end of the control end of the second switch tube 220 is connected to the second tap of the secondary winding. The induced electromotive force on the secondary winding causes the voltage at the control end of the first switch tube 210 and the control end of the second switch tube 220 to rise and fall, so that one of the first switch tube 210 and the second switch tube 220 is turned on and the other is turned off, and the first primary winding equivalent inductance, the second primary winding equivalent inductance and the atomizer sheet equivalent capacitor C1 resonate, and the atomizer sheet equivalent capacitor C1 is in a charging or discharging state. When the resonant voltage of the atomizer sheet equivalent capacitor C1 is 0, the atomizer sheet equivalent capacitor C1 switches the working state, and the first switch tube 210 and the second switch tube 220 are in a state opposite to the previous process, one is turned on and the other is turned off, and the atomizer sheet equivalent capacitor C1 is in a charging or discharging state opposite to the previous process. When the resonant voltage of the atomizer sheet equivalent capacitor C1 is 0 again, the current process ends, and the circuit returns to the previous state to work, and works repeatedly. The first primary winding equivalent inductance, the second primary winding equivalent inductance and the atomizer sheet equivalent capacitor C1 form a current loop. The atomizer sheet equivalent capacitor C1 switches the charging and discharging working states according to the conduction state of the first switch tube 210 and the second switch tube 220. Energy is repeatedly transmitted between the inductance and the capacitance to form resonance. When the atomizer sheet control circuit needs to stop working, the voltage state of the first end of the first switch tube 210 and the first end of the second switch tube 220 can be controlled by the controller 100 to control other devices in the atomizer sheet control circuit. The structure is simple and the efficiency is high.

[0031] In one embodiment, see Figure 3 The atomizer control circuit also includes a third switch tube, the control end of the third switch tube is connected to the controller 100, the first end of the first switch tube 210 and the first end of the second switch tube 220 are both connected to the second end of the third switch tube, and the first end of the third switch tube is grounded. The controller 100 is connected to the control end of the third switch tube, and the controller 100 can send a high level or a low level to the control end of the third switch tube. The third switch tube may be in an on or off state when the control end receives a high level or a low level. When the third switch tube is turned on, the first switch tube 210 and the second switch tube 220 start to work. When the third switch tube is turned off, the atomizer control circuit stops working. The controller 100 controls whether the atomizer control circuit works by controlling the level at the control end of the third switch tube. A small current can be used to control the on and off of a large current, which is convenient to use.

[0032] Specifically, the type of the third switch tube is not unique. In the present embodiment, the third switch tube is an NPN transistor, referred to as the third transistor Q3. The base of the third transistor Q3 is connected to the controller 100, the collector of the third transistor Q3 is connected to the first end of the first switch tube 210 and the first end of the second switch tube 220, and the emitter of the third transistor Q3 is grounded. When the controller 100 transmits a high level to the base of the third transistor Q3, the third transistor Q3 is turned on, and other devices in the atomizer control circuit start working. When the controller 100 transmits a low level to the base of the third transistor Q3, the third transistor Q3 is turned off, and the atomizer control circuit stops working. A small current can be used to control the on and off of a large current, and it is reliable to use. It can be understood that in other embodiments, the third switch tube can also be of other types, as long as those skilled in the art believe that it can be achieved.

[0033] In one embodiment, see Figure 3 The atomizer control circuit also includes a current limiting resistor R3, and the controller 100 is connected to the control end of the third switch tube through the current limiting resistor R3. The current limiting resistor R3 can limit the current flowing to the control end of the third switch tube to avoid the third switch tube from being burned due to excessive current at the control end of the third switch tube, thereby improving the working performance of the third switch tube. The resistance value of the current limiting resistor R3 is not unique and can be selected according to actual needs, as long as those skilled in the art believe that it can be achieved.

[0034] In one embodiment, see Figure 3 The atomizer control circuit also includes a diode D1. The anode of the diode D1 is used to connect to the power supply, and the cathode of the diode D1 is connected to the third tap of the primary winding. The diode D1 is located between the power supply and the transformer T1, and plays a unidirectional conductive role, limiting the current to flow only from the power supply to the primary winding of the transformer T1. In the reverse direction, the current cannot flow through the diode D1, and it can also play an isolation role. In addition, the diode D1 can withstand a relatively high reverse voltage, thereby playing a reverse blocking role.

[0035] In one embodiment, see Figure 3, the atomizer control circuit also includes an inductor L0, one end of which is used to connect to the power supply, and the other end is connected to the third tap of the primary winding. The inductor is located between the power supply and the transformer T1, and can be used as a damping inductor to reduce current ripple and improve current quality, thereby improving the working performance of the transformer T1. The inductance value of the inductor is not unique, and can be selected according to the equivalent inductance value of the primary winding of the transformer T1. For example, in this embodiment, the inductance value of the inductor is greater than five times the equivalent inductance value of the primary winding of the transformer T1, and the filtering effect is good. Expandably, when the atomizer control circuit also includes a diode D1, the anode of the diode D1 is connected to the power supply, the cathode of the diode D1 is connected to one end of the inductor, and the other end of the inductor is connected to the third tap of the primary winding. In this way, the diode D1 and the inductor are connected in series on the same branch to complete the rectification and filtering of the power supply output current, improve the quality of the current received by the transformer T1, and thus improve the working stability of the transformer T1.

[0036] In one embodiment, the third tap of the primary winding is located between the first tap of the primary winding and the second tap of the primary winding. When the third tap of the primary winding is located between the first tap of the primary winding and the second tap of the primary winding, the equivalent inductance between the first tap and the third tap is called the first primary winding equivalent inductance, and the equivalent inductance between the second tap and the third tap is called the second primary winding equivalent inductance, then the inductance values ​​of the first primary winding equivalent inductance and the second primary winding equivalent inductance are equal. The first primary winding equivalent inductance, the second primary winding equivalent inductance and the atomizer sheet equivalent capacitor C1 form a current loop and resonate. When the inductance values ​​of the first primary winding equivalent inductance and the second primary winding equivalent inductance are equal, the atomizer sheet equivalent capacitor C1 can obtain a relatively complete sine wave, improve the stability of the circuit operation, and thus improve the atomization effect.

[0037] In one embodiment, the first switch tube 210 and the second switch tube 220 are both triodes. When the first switch tube 210 and the second switch tube 220 are both triodes, the first switch tube 210 and the second switch tube 220 have a current amplification function, can control the change of the larger collector current with the small current of the base, and can also control the on and off of the circuit according to its own on or off state, and the switching efficiency is high.

[0038] Specifically, when the first switch tube 210 and the second switch tube 220 are both triodes, the first switch tube 210 is the first triode Q1, and the second switch tube 220 is the second triode Q2. Further, the first triode Q1 and the second triode Q2 can both be NPN triodes. Taking the atomizer control circuit including the third switch tube as an example, the base of the first triode Q1 is connected to the first bias resistor R1, the emitter of the first triode Q1 is connected to the second end of the third switch tube, the collector of the first triode Q1 is connected to the first tap of the primary winding, and is also connected to the first lead of the atomizer equivalent capacitor C1. The base of the second triode Q2 is connected to the second bias resistor R2, the emitter of the second triode Q2 is connected to the second end of the third switch tube, the collector of the second triode Q2 is connected to the second tap of the primary winding, and is also connected to the second lead of the atomizer equivalent capacitor C1.

[0039] When the atomizer control circuit includes a third switch tube, the third switch tube is a third transistor Q3, for example, when the controller 100 gives the base ctrl high level of the third transistor Q3, the third transistor Q3 is saturated and turned on. Due to the asymmetry of the first bias resistor R1 and the second bias resistor R2 (for example, R1 < R2), the maximum collector current I of the first transistor Q1 is cq1max Greater than the maximum collector current I of the second transistor Q2 cq2max , in the same time period, there is dI cq1 / dt>dI cq2 / dt, where I cq1 is the collector current of the first transistor, I cq2 is the collector current of the second triode. The first tap of the primary winding of transformer T1 is position 1, the third tap of the primary winding is position 2, the second tap of the primary winding is position 3, the first tap and the second tap of the primary winding are the taps at both ends of the primary winding respectively, the third tap of the primary winding is the tap between the first tap and the second tap of the primary winding, the inductance between the first tap and the third tap is L1, the inductance between the second tap and the third tap is L2, L1=L2=L. U13=2L(dI2 / dt-dI1 / dt)<0 at both ends of the primary winding of transformer T1, where I1 is the current of the branch where the collector of the first triode is located, and I2 is the current of the branch where the collector of the second triode is located.

[0040] The first tap of the secondary winding of transformer T1 is at position 5, and the first tap of the secondary winding of transformer T1 is at position 4. Since the coupling coefficient of transformer T1 can be approximately regarded as 1, the mutual inductance ratio between the primary taps is M=L1=L2=L. Therefore, according to the same-name terminal U45<0 of transformer T1, the induced electromotive force causes the base potential of the first transistor Q1 to rise, forming positive feedback to the first transistor Q1 and negative feedback to the second transistor Q2. Finally, the first transistor Q1 is turned on and the second transistor Q2 is turned off. The voltage of the equivalent capacitor C1 of the atomizer is negative at the top and positive at the bottom.

[0041] After the first transistor Q1 is turned on and the second transistor Q2 is turned off, L1, L2 and the equivalent capacitor C1 of the capacitor atomizer resonate, and the resonant voltage is: Uc = -sinωt, where When the voltage resonance of the atomizer equivalent capacitor C1 is zero, the first process ends. After the atomizer equivalent capacitor C1 is fully charged, it is discharged to zero. At this time, the second transistor Q2 starts to conduct and the current increases from 0. Therefore, there is dI in the same time. c1 / dt <dI c2 / dt, U13=2L(dI2 / dt-dI1 / dt)>0, U45>0 at both ends of the primary winding of the transformer T1, then the second transistor Q2 is turned on, the first transistor Q1 is turned off, and the voltage of the equivalent capacitor C1 of the atomizer is positive at the top and negative at the bottom. When the voltage resonance of the equivalent capacitor C1 of the atomizer is positive at the top and negative at the bottom, the secondary winding induced electromotive force U45>0, the induced electromotive force causes the base potential of the first transistor Q1 to drop, the base potential of the second transistor Q2 to rise, and the second transistor Q2 forms positive feedback. Finally, the first transistor Q1 is turned off, and the second transistor Q2 is turned on. When the voltage resonance of the equivalent capacitor C1 of the atomizer is zero, the second process ends. The resonance diagram of the second process is the same as the first process, only the positions of L1 and L2 are interchanged, so the voltage direction of the equivalent capacitor C1 of the capacitor atomizer also changes accordingly, and the waveform at both ends of the equivalent capacitor C1 of the atomizer is a sine wave. After the second process ends, it will return to the first process, and work back and forth like this. When ctrl is at a high level, the circuit starts to work according to the above process. When ctrl is at a low level, this resonant state is turned off and the circuit does not work.

[0042] Due to the characteristics of parallel resonance, the current flowing through the main circuit is very small during resonance, that is, the current flowing through the collector of the third transistor Q3 is very small. This is because the currents of the capacitor and inductor branches cancel each other out, and the theoretical main circuit current is 0. However, due to the influence of the parasitic parameters of the circuit, the main circuit current exists, but it is very small compared to the current of each branch and can be ignored. L1, L2, and C1 can be regarded as a current loop. Figure 4 , energy is repeatedly transmitted between the inductor and capacitor, forming resonance. After the transformer T1 is decoupled, Figure 5 , resonant frequency

[0043] In one embodiment, the parameters of the first switching transistor 210 and the second switching transistor 220 are matched. Specifically, the matching of the parameters of the first switching transistor 210 and the second switching transistor 220 may mean that the parameters of the first switching transistor 210 and the second switching transistor 220 are the same. In this way, a relatively perfect sine wave can be obtained for the equivalent capacitance C1 of the atomizing sheet, improving the stability of the circuit operation and thus enhancing the atomizing effect.

[0044] In one embodiment, the transformer T1 is a high-frequency transformer. A high-frequency transformer is a power transformer T1 whose operating frequency exceeds the intermediate frequency (10 kHz). According to the operating frequency, it can be divided into several grades: 10 kHz - 50 kHz, 50 kHz - 100 kHz, 100 kHz - 500 kHz, 500 kHz - 1 MHz, above 10 MHz. The operating frequency of the atomizing sheet control circuit is generally in the range of 100 KHz - 10 MHz. Therefore, the application of a high-frequency transformer can ensure the operating performance of the atomizing sheet control circuit.

[0045] To better understand the above embodiments, the following will be explained in detail with a specific embodiment. In one embodiment, please refer to Figure 1 、 3 ,the atomizing sheet control circuit includes a controller 100, a first switching transistor 210, a second switching transistor 220, a first bias resistor R1, a second bias resistor R2, a transformer T1, a third switching transistor, a current-limiting resistor R3, a diode D1, and an inductor. The first switching transistor 210, the second switching transistor 220, and the third switching transistor are all NPN triodes. The first bias resistor R1 and the second bias resistor R2 respectively provide base current bias for the first switching transistor 210 and the second switching transistor 220. The inductor is a damping inductor. The transformer T1 is a high-frequency transformer. The atomizing sheet control circuit is powered by 12V. The controller 100 is a single-chip microcomputer. The controller 100 controls whether the atomizing sheet control circuit works through the CTRL port. The power supply of the single-chip microcomputer is 5V. The first switching transistor 210 and the second switching transistor 220 control the circuit to work or stop. When they are cut off, the circuit stops. When they are turned on, two square waves with a half-cycle difference are output. The inductor is used to reduce the current ripple, L0 > 10L. When the third switching transistor is turned on, the circuit starts to work. When it is cut off, the circuit stops working.

[0046] Specifically, when the ctrl is at a high level, Q3 is saturated and turned on. Due to the asymmetry of the base resistors of the triodes Q1 and Q2 (R1 < R2), the maximum collector current has I cq1max >I cq2max , and within the same time, there is dI cq1 / dt > dI cq2 / dt. The voltage across the primary winding of the transformer T1, U13 = 2L(dI2 / dt - dI1 / dt) < 0.

[0047] Assume that the primary winding inductance of transformer T1 is L1 and L2. Since it is a middle tap, L1=L2=L. Since the coupling coefficient of transformer T1 can be approximately regarded as 1, the mutual inductance ratio between the primary taps is M=L1=L2=L. Therefore, according to the same-name terminal U45<0 of transformer T1, the induced electromotive force causes the base potential of Q1 to rise, forming positive feedback to Q1 and negative feedback to Q2. Finally, Q1 is turned on, Q2 is turned off, and the voltage of C1 is negative at the top and positive at the bottom.

[0048] After Q1 is turned on and Q2 is turned off, L1, L2 and capacitor C1 resonate, and the resonant voltage is: Uc = -sinωt, where When the voltage resonance of C1 is zero, the first process ends. For the resonance equivalent diagram of the first process, please refer to Figure 6 After C1 is fully charged, it discharges to zero. At this time, Q2 starts to conduct and the current starts to increase from 0. Therefore, in the same time, there is dI c1 / dt <dI c2 / dt, U13=2L(dI2 / dt-dI1 / dt)>0, U45>0 at both ends of the primary winding of transformer T1, then Q2 is turned on, Q1 is turned off, and the voltage of C1 is positive at the top and negative at the bottom. When the C1 voltage resonates to be positive at the top and negative at the bottom, the secondary winding induced electromotive force U45>0, the induced electromotive force causes the base potential of Q1 to drop, the base potential of Q2 to rise, Q2 forms positive feedback, and finally Q1 is turned off, Q2 is turned on, and when the C1 voltage resonates to zero, the second process ends. The resonance diagram of the second process is the same as the first process, only the positions of L1 and L2 are interchanged, so the direction of the voltage of capacitor C1 also changes, and the waveform at both ends of C1 is a sine wave. After the second process ends, it will return to the first process, and work back and forth like this. When ctrl is high, the circuit starts to work according to the above process. When ctrl is low, this resonance state is turned off and the circuit does not work.

[0049] Due to the characteristics of parallel resonance, the current flowing through the main circuit is very small during resonance (i.e., the current flowing through the collector of Q3). This is because the currents of the capacitor and inductor branches cancel each other out. The theoretical main current is 0, but in reality, due to the influence of the parasitic parameters of the circuit, the main current exists, but it is very small compared to the current of each branch and can be ignored. L1, L2, and C1 can be regarded as a current loop (such as Figure 4 ), energy is repeatedly transmitted between the inductor and capacitor, forming resonance. Figure 5 , transformer T1 decoupling refers to the equivalent transformation between the windings of transformer T1, that is, from Figure 4 Transform to Figure 5 .

[0050] The above-mentioned atomizer sheet control circuit includes a controller 100, a first switch tube 210, a second switch tube 220, a first bias resistor R1, a second bias resistor R2 and a transformer T1. The transformer T1 includes a primary winding and a secondary winding. Based on the connection relationship of these components, after the transformer T1 is connected to the power supply, due to the different resistance values ​​of the first bias resistor R1 and the second bias resistor R2, the current at the second end of the first switch tube 210 and the second end of the second switch tube 220 is different, so that the first tap and the second tap of the primary winding of the transformer T1 are A potential difference is formed between the heads, and an induced electromotive force is formed on the secondary winding of the transformer T1. The voltage on the secondary winding of the transformer T1 is fed back to the first switch tube 210 and the second switch tube 220, so that one of the two switch tubes is turned on and the other is turned off, and the equivalent capacitance of the atomizer sheet switches between charging and discharging states. The primary winding of the transformer T1 and the equivalent capacitance of the atomizer sheet form a current loop, and energy is repeatedly transmitted between the primary winding and the equivalent capacitance of the atomizer sheet, so that the circuit operation tends to be stable within a certain frequency range and enters a resonant state. This circuit can make the atomizer sheet work within a certain range, form uniform and stable atomized particles, improve the atomization effect, and thus improve the reliability of the atomizer sheet.

[0051] In one embodiment, an atomizer device is provided, comprising an atomizer sheet and the atomizer sheet control circuit as described above.

[0052] The above-mentioned atomizer device includes a controller 100, a first switch tube 210, a second switch tube 220, a first bias resistor R1, a second bias resistor R2 and a transformer T1. The transformer T1 includes a primary winding and a secondary winding. Based on the connection relationship between these components, after the transformer T1 is connected to the power supply, due to the different resistance values ​​of the first bias resistor R1 and the second bias resistor R2, the current at the second end of the first switch tube 210 and the second end of the second switch tube 220 is different, so that the first tap and the second tap of the primary winding of the transformer T1 are A potential difference is formed between them, and an induced electromotive force is formed on the secondary winding of the transformer T1. The voltage on the secondary winding of the transformer T1 is fed back to the first switch tube 210 and the second switch tube 220, so that one of the two switch tubes is turned on and the other is turned off, and the equivalent capacitance of the atomizer sheet switches between charging and discharging states. The primary winding of the transformer T1 and the equivalent capacitance of the atomizer sheet form a current loop, and energy is repeatedly transmitted between the primary winding and the equivalent capacitance of the atomizer sheet, so that the circuit operation tends to be stable within a certain frequency range and enters a resonant state. This circuit can make the atomizer sheet work within a certain range, form uniform and stable atomized particles, improve the atomization effect, and thus improve the reliability of the atomizer sheet.

[0053] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An atomizer control circuit, characterized in that: It includes a controller, a first switch tube, a second switch tube, a first bias resistor, a second bias resistor and a transformer, wherein the transformer includes a primary winding and a secondary winding; The first end of the first switch tube and the first end of the second switch tube are both connected to the controller, the control end of the first switch tube is connected to the control end of the second switch tube through the first bias resistor and the second bias resistor in sequence, and the first bias resistor and the second bias resistor have different resistance values; The second end of the first switch tube is connected to the first tap of the primary winding and is also used to connect the first lead of the atomizer sheet. The second end of the second switch tube is connected to the second tap of the primary winding and is also used to connect the second lead of the atomizer sheet. The third tap of the primary winding is used to connect to the power supply. The third tap of the primary winding is located between the first tap of the primary winding and the second tap of the primary winding. A common end of the first bias resistor and the control end of the first switch tube is connected to a first tap of the secondary winding, and a common end of the second bias resistor and the control end of the second switch tube is connected to a second tap of the secondary winding.

2. The atomizer control circuit according to claim 1, characterized in that: It also includes a third switch tube, a control end of the third switch tube is connected to the controller, a first end of the first switch tube and a first end of the second switch tube are both connected to the second end of the third switch tube, and a first end of the third switch tube is grounded.

3. The atomizer control circuit according to claim 2, characterized in that: It also includes a current limiting resistor, and the controller is connected to the control end of the third switch tube through the current limiting resistor.

4. The atomizer control circuit according to claim 1, characterized in that: It also includes a diode, wherein the anode of the diode is used to access a power supply, and the cathode of the diode is connected to the third tap of the primary winding.

5. The atomizer control circuit according to claim 1, characterized in that: It also includes an inductor, one end of which is used to connect to a power supply, and the other end of which is connected to the third tap of the primary winding.

6. The atomizer control circuit according to claim 1, characterized in that: The third tap of the primary winding is located between the first tap of the primary winding and the second tap of the primary winding.

7. The atomizer control circuit according to claim 1, characterized in that: The first switch tube and the second switch tube are both triodes.

8. The atomizer control circuit according to claim 1, characterized in that: The parameters of the first switch tube and the second switch tube match.

9. The atomizer control circuit according to claim 1, characterized in that: The transformer is a high-frequency transformer.

10. An atomizer device, characterized in that: It comprises an atomizer sheet and an atomizer sheet control circuit as described in any one of claims 1 to 9.

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