Cordless vacuum cleaner and operating method of cordless vacuum cleaner

Abstract

An operating method of a cordless vacuum cleaner includes detecting connection of a brush device to a cleaner body, through a voltage value input to an input port of at least one processor through a signal line or a load detection sensor of the cleaner body, identifying a type of the brush device connected to the cleaner body, when the connection of the brush device to the cleaner body is detected, determining a frequency for pulse width modulation (PWM) control corresponding to the identified type of the brush device, and controlling an operation of the switch device used to supply power from a battery of the cleaner body to the brush device connected to the cleaner body.

1 . A cordless vacuum cleaner comprising:
 a battery;   a switch device used to supply power from the battery to a brush device ( 2000 ) connected to a cleaner body;   a load detection sensor configured to detect a load of the brush device connected to the cleaner body; and   at least one processor configured to:
 detect connection of the brush device to the cleaner body, based on at least one of a voltage value input to an input port of the at least one processor through a signal line or the load of the brush device; 
   identify a type of the brush device connected to the cleaner body;   determine a frequency for pulse width modulation (PWM) control coresponding to the identified type of the brush device; and   control an operation of the switch device, based on the frequency.   
     
     
         2 . The cordless vacuum cleaner of  claim 1 , wherein the frequency for the PWM control is determined to increase as a maximum motor output value corresponding to the identified type of the brush device increases, and to decrease as the maximum motor output value corresponding to the identified type of the brush device decreases. 
     
     
         3 . The cordless vacuum cleaner of  claim 1 , wherein the at least one processor is further configured to
 determine an input voltage of the brush device, based on the type of the brush device, and   adjust a duty value for the PWM control, according to the determined input voltage of the brush device and a voltage drop of the battery.   
     
     
         4 . The cordless vacuum cleaner of  claim 3 , wherein the at least one processor is further configured to:
 measure a load value of the brush device through the load detection sensor; and   adjust at least one of the determined frequency or the determined input voltage of the brush device, based on the load value of the brush device.   
     
     
         5 . The cordless vacuum cleaner of  claim 4 , wherein the at least one processor is further configured to:
 adjust at least one of the determined frequency or the determined input voltage of the brush device to be higher as the load value of the brush device increases; and   adjust at least one of the determined frequency or the determined input voltage of the brush device to be lower as the load value of the brush device decreases.   
     
     
         6 . The cordless vacuum cleaner of  claim 5 , wherein the at least one processor is further configured to:
 adjust at least one of the determined frequency or the determined input voltage of the brush device to be higher, when the load value of the brush device is greater than a high load reference value corresponding to the type of the brush device; and   adjust at least one of the determined frequency or the determined input voltage of the brush device to be lower, when the load value of the brush device is less than a low load reference value corresponding to the type of the brush device.   
     
     
         7 . The cordless vacuum cleaner of  claim 3 , wherein the at least one processor is further configured to adjust at least one of the determined frequency or the determined input voltage of the brush device, based on a suction power strength of the cleaner body. 
     
     
         8 . The cordless vacuum cleaner of  claim 7 , wherein the at least one processor is further configured to:
 receive a user input that selects a suction power erode among a plurality of different suction power modes having different suction power strengths; and   adjust at least one of the determined frequency or the determined input voltage of the brush device, based on a suction power strength of the suction power mode selected by the user input.   
     
     
         9 . The cordless vacuum cleaner of  claim 7 , wherein the at least one processor is further configured to:
 identify a current usage environment state of the brush device, by applying a pressure value in a flow path measured by a pressure sensor of the cleaner body and a load value of the brush device obtained through the load detection sensor to an artificial intelligence (AI) model trained to infer a possible usage environment state of the brush device;   adjust the suction power strength of the cleaner body, based on the current usage environment state of the brush device; and   adjust at least one of the determined frequency and the determined input voltage of the brush device, based on the adjusted suction power strength.   
     
     
         10 . The cordless vacuum cleaner of  claim 3 , wherein the at east one processor is further configured to increase the determined frequency and the duty value, when the voltage drop of the battery is detected. 
     
     
         11 . The cordless vacuum cleaner of  claim 1 , wherein the at least one processor is further configured to:
 determine a trip level comprising a reference load value for stopping an operation of the brush device, based on the type of the brush device; and   in response to monitoring a load value of the brush device through the load detection sensor, when the load value of the brush device reaches the reference load value of the trip level, control the switch device to cut off power supply to the brush device.   
     
     
         12 . The cordless vacuum cleaner of  claim 11 , wherein the at least one processor is further configured to:
 adjust the determined trip level to be higher, when the load value of the brush device is greater than a high load reference value correspond to the type of the brush device; and   adjust the determined trip level to be lower, when the load value of the brush device is less than a low load reference value corresponding to the type of the brush device.   
     
     
         13 . The cordless vacuum cleaner of  claim 11 , wherein the at least one processor is further configured to:
 Adjust the determined trip level, based on a suction power strength of the cleaner body, and   in response to monitoring the load value of the brush device through the load detection sensor, when the load value of the brush device reaches a load value of the adjusted trip level, control the switch device to cut off power supply to the brush device.   
     
     
         14 . The cordless vacuum cleaner of  claim 1 , wherein the at least one processor is further configured to identify the type of the brush device, based on the voltage value input to the input port of the at least one processor through the signal line. 
     
     
         15 . The cordless vacuum cleaner of  claim 14 , wherein the at least one processor is further configured to:
 when the voltage value input to the input port through the signal line is between a maximum input voltage value and a minimum input voltage value, identify a first type of brush device comprising an identification resistor corresponding to the voltage value input to the input port from among a plurality of identification resistors as the brush device connected to the cleaner body.   
     
     
         16 . The cordless vacuum cleaner of  claim 14 , wherein the at least one processor is further configured to:
 when the voltage value input to the input port is maintained as a maximum input voltage value regardless of an on or off state of the switch device, identify a second type of brush device in which the signal line is short-circuited to a positive (+) power line as the brush device connected to the cleaner body.   
     
     
         17 . The cordless vacuum cleaner of  claim 14 , wherein the at least one processor is further configured to:
 when the voltage value input to the input port in an off state of the switch device is a maximum input voltage value and the voltage value input to the input port in an on state of the switch device is a minimum input voltage value, identify a third type of brush device in which the signal line is short-circuited to a negative (−) power line as the brush device connected to the cleaner body.   
     
     
         18 . The cordless vacuum cleaner of  claim 14 , wherein the at least one processor is further configured to:
 when the voltage value input to the input port is constant as a minimum input voltage value regardless of an on or off state of the switch device, identify a fourth type of brush device in which the signal line is open as the brush device connected to the cleaner body.   
     
     
         19 . The cordless vacuum cleaner of  claim 1 , wherein the frequency determined for the PWM control varies from 0.5 kHz to 8 kHz. 
     
     
         20 . An operating method of a cordless vacuum cleaner, the operating method comprising:
 detecting, by a load detection sensor, a load of a brush device connected to a cleaner body;   detecting connection of the brush device to the cleaner body, based on at least one of a voltage value input to an input port of at least one processor through a signal line, and the load of the brush device;   identifying a type of the brush device connected to the cleaner body, when the connection of the brush device to the cleaner body is detected;   determining a frequency for pulse width modulation (PWM) control corresponding to the identified type of the brush device; and   controlling an operation of a switch device used to supply power from a battery of the cleaner body to the brush device connected to the cleaner body.