Aerosol generating apparatus and operation method of the same
Disclosed is an aerosol generating apparatus including an atomizer configured to generate an aerosol from an aerosol generating material; a controller configured to output a driving voltage for controlling the atomizer; and a voltage divider operationally connected to the controller and configured to control an input voltage of the atomizer by adjusting voltage division of the driving voltage, such that a pre-heating voltage is applied to the atomizer while the atomizer is being pre-heated in a non-puff period and an atomization voltage is applied to the atomizer while the atomizer is atomizing the aerosol generating material in a puff period.
1 . An aerosol generating apparatus comprising:
an atomizer configured to generate an aerosol from an aerosol generating material by using ultrasonic vibration;
a controller configured to output a driving voltage for controlling a frequency of the ultrasonic vibration of the atomizer; and
a voltage divider operationally connected to the controller and configured to control an input voltage of the atomizer by adjusting a ratio of voltage division of the driving voltage, such that a pre-heating voltage is applied to the atomizer while the atomizer is being pre-heated in a non-puff period being a period between puff periods and an atomization voltage is applied to the atomizer while the atomizer is atomizing the aerosol generating material in a puff period,
wherein the pre-heating voltage is lower than the atomization voltage, and
wherein the pre-heating voltage corresponds to an ultrasonic vibration frequency for maintaining the aerosol generating material in a predetermined viscosity state in which atomization of the aerosol generating material does not occur.
2 . The aerosol generating apparatus of claim 1 , wherein the pre-heating voltage is a constant voltage lower than the atomization voltage.
3 . The aerosol generating apparatus of claim 1 , wherein
the controller generates a mode signal indicating whether the atomizer is in a pre-heating mode or an atomizing mode, and
the voltage divider performs the voltage division based on the mode signal.
4 . The aerosol generating apparatus of claim 3 , wherein the voltage divider changes connections of loads included in the voltage divider according to a first mode signal corresponding to the pre-heating mode or a second mode signal corresponding to the atomization mode.
5 . The aerosol generating apparatus of claim 1 , wherein the voltage divider comprises:
a first load connected to a node between a voltage output terminal of the controller that outputs the driving voltage and a voltage input terminal of the atomizer;
a second load connected in series to the first load;
a reference voltage node between the first load and the second load to which a reference voltage is applied from the controller;
a third load having one terminal connected to the second load and another terminal connected to a ground; and
a switch configured to switch a current flow between the second load and the third load according to a mode signal received from the controller.
6 . The aerosol generating apparatus of claim 5 , wherein the switch comprises a semiconductor switch configured to turn on and off a current flow between a source terminal coupled to the ground and a drain terminal coupled to a node between the second load and the third load according to a type of the mode signal received through a gate terminal.
7 . The aerosol generating apparatus of claim 6 , wherein
the switch is turned off in response to a first mode signal corresponding to a pre-heating mode received from the controller, and
the voltage divider applies the pre-heating voltage to the voltage input terminal of the atomizer by blocking the current flow between the source terminal and the drain terminal according to a turn-off state of the switch and dropping the driving voltage at the third load.
8 . The aerosol generating apparatus of claim 6 , wherein
the switch is turned on in response to a second mode signal corresponding to an atomization mode received from the controller, and
the voltage divider applies the atomizing voltage to the voltage input terminal of the atomizer by blocking a current flow to the third load and allowing the current flow between the source terminal and the drain terminal according to a turn-on state of the switch.
9 . The aerosol generating apparatus of claim 5 , wherein
a current flow to the third load is allowed by the switch in a pre-heating mode, and
the current flow to the third load is blocked by the switch in an atomization mode.
10 . The aerosol generating apparatus of claim 5 , wherein, due to a voltage drop by the third load in a pre-heating mode, the pre-heating voltage lower than the atomization voltage is applied to the atomizer.
11 . The aerosol generating apparatus of claim 1 , wherein the atomizer comprises a vibrator configured to generate the ultrasonic vibration to atomize the aerosol generating material into the aerosol.
12 . The aerosol generating apparatus of claim 1 , further comprising a puff detecting sensor configured to detect a puff of a user,
wherein the controller controls the voltage division of the voltage divider based on whether the puff detecting sensor detects the puff period or the non-puff period.
13 . A method of controlling an aerosol generating apparatus, the method comprising:
outputting, by a controller, a driving voltage for controlling a frequency of ultrasonic vibration of an atomizer to generate an aerosol from an aerosol generating material; and
controlling, by a voltage divider operationally coupled to the controller, an input voltage of the atomizer by adjusting a ratio of voltage division of the driving voltage, such that a pre-heating voltage is applied to the atomizer while the atomizer is being pre-heated in a non-puff period being a period between puff periods and an atomization voltage is applied to the atomizer while the atomizer is atomizing the aerosol generating material in a puff period,
wherein the pre-heating voltage is lower than the atomization voltage, and
wherein the pre-heating voltage corresponds to an ultrasonic vibration frequency for maintaining the aerosol generating material in a predetermined viscosity state in which atomization of the aerosol generating material does not occur.
14 . The method of claim 13 , further comprising generating, by the controller, a first mode signal corresponding to a pre-heating mode or a second mode signal corresponding to an atomization mode,
wherein the controlling comprises:
controlling an operation of a switch included in the voltage divider in response to the first mode signal or the second mode signal;
adjusting voltage division of the driving voltage by switching connections of loads included in the voltage divider in response to the operation of the switch; and
applying the pre-heat voltage or the atomization voltage as the input voltage to the atomizer based on the adjusted voltage division.