Patent ID: 12201146

DETAILED DESCRIPTION

To prevent the load and circuit from being damaged by abnormal operations, the present invention provides an ultrasonic atomization control system and an electronic cigarette.

Referring toFIG.1,FIG.1is a schematic view of an ultrasonic atomization control system according to an embodiment of the present invention. The ultrasonic atomization control system100includes a current feedback circuit101and/or a voltage feedback circuit102, a microcontroller unit (MCU)103, a push-pull circuit104, and an oscillator driving circuit105.

The push-pull circuit104is coupled between the microcontroller unit103and the oscillator driving circuit105. The current feedback circuit101and/or the voltage feedback circuit102are/is coupled between the oscillator driving circuit105and the microcontroller unit103. The oscillator driving circuit105is configured to be connected with a load. The microcontroller unit103is configured to output a pulse width modulation signal with a predetermined frequency to the push-pull circuit104, judge whether a current and/or a voltage fluctuation fed back by the current feedback circuit101and/or the voltage feedback circuit102are/is greater than a threshold. If the fluctuation is greater than the threshold, the microcontroller unit103turns off the oscillator driving circuit105, that is, stops operation of the load.

Referring toFIG.2,FIG.2is a schematic view of details of the ultrasonic atomization control system100. The microcontroller unit103includes an A/D conversion circuit201, a comparator circuit202and a control circuit203.

An input end of the A/D conversion circuit201is coupled with an output end of the current feedback circuit101and/or the voltage feedback circuit102. The A/D conversion circuit201is configured to convert a feedback current signal and/or a feedback voltage signal into a digital signal and input the digital signal to the comparator circuit202.

The comparator circuit202is coupled between the A/D conversion circuit201and the control circuit203. The comparator circuit202is configured to compare the digital signal received from the A/D conversion circuit201with the threshold. If the digital signal is greater than the threshold, The comparator circuit202inputs a first signal to the control circuit203.

An output end of the control circuit203is coupled with an output end of the push-pull circuit104. The control circuit203is configured to output a pulse width modulation signal to the push-pull circuit104. When the control circuit203receives the first signal, the control circuit203controls the output pulse width modulation signal to be in a low level state, and thus controls the load connected with the oscillator driving circuit105to stop operating.

Referring toFIG.3, to practice the above scheme, the present invention schematically provides a circuit view of an ultrasonic atomization control system.

The oscillator driving circuit105includes a control switch301and an inductor302. The control switch301includes a control end3011, a first end3012and a second end3013. The control end3011is connected with the push-pull circuit104, the first end3012is connected with a first grounding resistor303, and the second end3013is connected with the load305through a first capacitor304. A first end3012of the control switch301is also connected with the load305. The load305may be an oscillator, an atomizing sheet or both, and the type of the load305is not limited herein. One end of the inductor302is connected with the second end3013of the control switch301, and the other end of the inductor302is connected with a voltage source. The voltage source may be 24 V or 12 V or the like, which is not limited herein.

The oscillator driving circuit105further includes a second capacitor306, a third capacitor307and a fourth capacitor308. The second capacitor306is connected in parallel with the two ends of the inductor302. The third capacitor307, and the fourth capacitor308and the inductor302are connected in parallel. One ends of the third capacitor307and the fourth capacitor308are connected with one end of the inductor302, which is connected with the voltage source. The other ends of the third capacitor307and the fourth capacitor308are connected to ground. The circuit formed by the above three capacitors is configured to reduce electromagnetic radiation to users.

The oscillator driving circuit105further includes a fifth capacitor309and a first resistor310that are connected in parallel, and a diode311. A positive end of the diode311is connected with the first capacitor304, and a negative end of the diode311is connected with one ends of the fifth capacitor309and the first resistor310that are connected in parallel. The other ends of the fifth capacitor309and the first resistor310that are connected in parallel are connected with one end of the inductor302, which is connected with the voltage source.

The voltage feedback circuit102includes a second resistor312and a third resistor313. The second resistor312is connected in series between the negative end of the diode311and the microcontroller unit103. One end of the third resistor313is connected between the second resistor312and the microcontroller unit103, wherein the third resistor313is a grounding resistor. A connection point A between the second resistor312and the third resistor313is configured as a voltage feedback point and is coupled with the microcontroller unit103. In other embodiments, the second resistor312may also be disposed between the positive end of the diode311and the first capacitor304.

The current feedback circuit101includes a fourth resistor314and a sixth capacitor315. The fourth resistor314is coupled between the first end3012of the control switch301and the microcontroller unit103, wherein the sixth capacitor315is a grounding capacitor. A connection point B between the fourth resistor314and the sixth capacitor315is configured as a current feedback point and is coupled with the microcontroller unit103. In other embodiments, the current feedback point may also be a connection point between the control switch301and the load305, that is, the fourth resistor314and the sixth capacitor315are not needed.

The push-pull circuit104includes a first triode316and a second triode317. The first triode316includes a first collector3161, a first base3162and a first emitter3163, and the second triode317includes a second collector3171, a second base3172and a second emitter3173. The second collector3171is coupled with a first output end1031of the microcontroller unit103, the second base3172is connected with the first base3162and is coupled with a second output end1032of the microcontroller unit103, the second emitter3173is connected with the first emitter3163and is coupled with the control end3011of the control switch301, and wherein the first collector3161is connected to ground. In the embodiment, the first output end1031of the microcontroller unit103is a power output end, and the second output end1032of the microcontroller unit103is a pulse width modulation signal output end. The push-pull circuit104is configured to amplify an input pulse width modulation signal.

In some exemplary embodiments, when the load305at the oscillator driving circuit105is in an abnormal operation state, if it is detected that a fluctuation range of the feedback current or the feedback voltage exceeds the threshold, the microcontroller unit103controls the output pulse width modulation signal to be in a low level state, such that the control switch301of the oscillator driving circuit105is turned off, and thus the load305stops operating.

In an application scenario, the threshold is defined as +30%, and in other application scenarios, the threshold may be defined as other values, which is not limited in the present invention.

Referring toFIG.4andFIG.5, in an application environment, an ultrasonic atomization control system further includes a filter circuit.FIG.4is a schematic view of a filter circuit according to an embodiment of the present invention. The filter circuit is of a typical x-shaped structure. The filter circuit includes a resistor401and two grounding capacitors402and403that are connected in parallel between two ends of the resistor401, and the filter circuit is coupled with the ultrasonic atomization control system100through the resistor401. In other embodiments, the filter circuit may be of an L-shaped structure, a T-shaped structure or the like structure.

As illustrated inFIG.5,FIG.5is a schematic view of an exemplary circuit of an ultrasonic atomization control system having the filter circuit inFIG.4according to an embodiment of the present invention.

The current feedback circuit101further includes a first filter circuit501coupled between the control switch301and the microcontroller unit103. The specific position of the first filter circuit501is not limited in this embodiment. In an exemplary embodiment, the first filter circuit501may be coupled between the control switch301and the fourth resistor314, or may be coupled between the fourth resistor314and the microcontroller103.

The voltage feedback circuit102further includes a second filter circuit502coupled between the oscillator driving circuit105and the microcontroller unit103. The specific position of the second filter circuit502is not limited in this embodiment. In an exemplary embodiment, the second filter circuit502may be coupled between the voltage feedback point A and the microcontroller unit103, or may be coupled between the voltage feedback point A and the second resistor312.

The push-pull circuit104further includes a third filter circuit503coupled between the microcontroller unit103and the second collector3171.

To ensure secure operation of the ultrasonic atomization control system100, some resistors or capacitors may also be connected in the circuit of the ultrasonic atomization control system100. Referring toFIG.6,FIG.6is a schematic view of an exemplary circuit of an ultrasonic atomization control system according to an embodiment of the present invention. A resistor601and a grounding resistor602that are connected in parallel are connected between the push-pull circuit104and the microcontroller unit103. A resistor603and a grounding resistor604that are connected in parallel are connected between the push-pull circuit104and the oscillator driving circuit105. In other embodiments, the position, type and number of connected resistors may be different, and the connected resistor may also be a capacitor.

Referring toFIG.7andFIG.8,FIG.7is a schematic structural view of an electronic cigarette according to an embodiment of the present invention, andFIG.8is a schematic block diagram of the electronic cigarette shown inFIG.7. The electronic cigarette800includes an atomizing sheet810and the ultrasonic atomization control system100as described in any of the above embodiments. When the electronic cigarette800receives an operation start instruction, the microcontroller unit therein outputs a pulse width modulation signal with a specific frequency and voltage to the push-pull circuit. While the electronic cigarette800is operating, the microcontroller unit detects in real time a feedback current or a feedback voltage of the oscillator driving circuit. When it is detected that the feedback current or the feedback voltage exceeds a threshold, the pulse width modulation signal output by the microcontroller unit is in a low level state, such that the control switch of the oscillator driving circuit is turned off, and thus the atomizing sheet stops operating, thereby preventing the atomizing sheet and the ultrasonic atomization control system100from being damaged.

Described above are exemplary embodiments of the present invention, but are not intended to limit the scope of the present invention. Any equivalent structure or equivalent process variation made based on the specification and drawings of the present invention, which is directly or indirectly applied in other related technical fields, fall within the scope of the present invention.