KR102292252B1 - cleaner - Google Patents

Abstract

The present invention relates to a vacuum cleaner. A vacuum cleaner according to an embodiment of the present invention includes a main body generating suction force, and a connection unit transmitting suction force generated in the main body to a suction port, and the main body includes a battery, a fan generating suction force by rotation, and AC power mode. A fan driving unit that drives the fan based on AC power input during operation, and drives the fan based on DC power stored in a battery when operating in a DC power mode, wherein the fan driving unit is configured to measure the distance between the main body and the connection unit Proportionally, it varies the output of the motor driving the fan. Accordingly, power consumption of the battery can be reduced.

Description

cleaner {cleaner}

The present invention relates to a vacuum cleaner, and more particularly, to a vacuum cleaner capable of reducing power consumption of a battery.

In general, among vacuum cleaners, a vacuum cleaner is a device that uses a suction force generated by an operation of a suction motor mounted inside a main body to suck in foreign substances such as air and dust, and then filters the foreign substances and stores them in a dust bin.

In particular, through the suction nozzle, dust and foreign substances on the surface to be cleaned are sucked by the suction force generated from the cleaner body, and the foreign substances are transferred to the cleaner body through a connection pipe, then filtered, and the foreign substances are stored in the dust container.

Meanwhile, for user convenience, a hands-free function is mounted on a vacuum cleaner, and for this purpose, a battery is installed in the vacuum cleaner so that it can be operated even when there is no power cord.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cleaner capable of reducing power consumption of a battery.

A cleaner according to an embodiment of the present invention for achieving the above object is provided with a main body generating a suction force, and a connection part for transmitting the suction force generated in the main body to a suction port, and the main body is a battery, which generates a suction force by rotation. A fan and a fan driving unit for driving the fan based on AC power input when operating in an AC power mode, and driving the fan based on DC power stored in a battery when operating in a DC power mode, wherein the fan driving unit includes: In proportion to the distance between the connection parts, the output of the motor driving the fan is varied.

According to an embodiment of the present invention, the vacuum cleaner includes a main body generating suction force, and a connection unit transmitting suction force generated in the main body to a suction port, and the main body includes a battery, a fan generating suction force by rotation, and AC power mode A fan driving unit for driving a fan based on AC power input during operation as a DC power mode and driving the fan based on DC power stored in a battery when operating in a DC power mode, wherein the fan driving unit includes a distance between the main body and the connection unit By varying the output of the motor driving the fan in proportion to , it is possible to reduce the power consumption of the battery.

In particular, as the distance between the main body and the connection part increases, the motor output for driving the fan increases, and as the distance between the body and the connection part decreases, the motor output for driving the fan decreases, thereby reducing the power consumption of the battery. there will be

1 is a perspective view showing a cleaner according to the present invention.
FIG. 2 is a view illustrating an ultrasonic sensor disposed near the handle of FIG. 1 and an ultrasonic sensor disposed on the body.
FIG. 3 illustrates calculating the distance between the main body and the connection part of FIG. 1 .
FIG. 4 is a block diagram schematically illustrating the inside of the cleaner shown in FIG. 1 .
5 is a circuit diagram illustrating a fan driving unit of the cleaner of FIG. 4 .
6 is a diagram illustrating a motor output variable according to a distance between a main body and a connection part.
7 illustrates a motor output variable waveform.
8 illustrates the relationship of motor speed versus distance.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The suffixes "module" and "part" for the components used in the following description are given simply in consideration of the ease of writing the present specification, and do not give a particularly important meaning or role by themselves. Accordingly, the terms “module” and “unit” may be used interchangeably.

1 is a perspective view showing a cleaner according to the present invention.

Referring to the drawings, the cleaner 100 according to the present invention includes a main body 130 , wheels 176 and 177 for moving the main body 130 , a dust container 140 , a suction port 110 , and a connection part 120 . ) is provided. In addition, it may further include a handle 115 formed on the connection unit 120 , and an input unit 117 formed near the handle 115 .

The main body 130 includes a fan and a fan driving unit for driving the fan, and generates suction force by rotation of the fan.

The generated suction force is transmitted to the connection part 120 connected to the main body 130 , and finally, to the suction port 110 connected to the connection part 120 .

Accordingly, the vacuum cleaner 100 can suck in foreign substances around the suction port 110 , and is stored in the dust container 140 that is detachably attached to the main body 130 through the connection part 120 .

In this case, a filter for filtering inhaled foreign substances may be further provided between the dust container 140 and the connection part 120 , and the dust container 140 may store the filtered foreign substances.

On the other hand, the connection part 120 is connected to the main body 130 , a bendable connection pipe 124 , and an extension pipe 122 that is adjustable in length and is connected between the connection pipe 124 and the suction port 110 . ) can be provided.

Meanwhile, the handle 115 and the input unit 117 may be formed on the extension tube 1220 .

On the other hand, the cleaner 100 in the present invention, through the cord line 105 and the power cord 107, by receiving an AC power input, it is possible to drive, and further comprising a battery (not shown), When power is not input, the vacuum cleaner may be operated even with battery power.

When the cleaner 100 operates with AC power, it may be called an AC power operation mode, and when the cleaner 100 operates with DC power, it may be called a DC power operation mode.

The present invention proposes a technique for reducing power consumption of a battery in a DC power operation mode.

Specifically, the main body 130 drives the fan 142 based on the battery 230, the fan 142 that generates suction force by rotation, and the AC power input when operating in the AC power mode, and the DC power supply A fan driving unit 143 for driving the fan 142 based on the DC power stored in the battery 230 when operating in mode is provided, and the fan driving unit 143 includes a distance between the main body 130 and the connection unit 120 . In proportion to , the output of the motor driving the fan 142 is varied. Accordingly, power consumption of the battery 230 can be reduced.

In particular, as the distance between the main body 130 and the main body 120 increases, the motor output for driving the fan increases, and as the distance between the main body 130 and the main body 120 decreases, the motor output for driving the fan increases. By reducing , it is possible to reduce power consumption of the battery 230 . This will be described in detail below with reference to FIG. 4 .

FIG. 2 is a diagram illustrating an ultrasonic sensor disposed near the handle of FIG. 1 and an ultrasonic sensor disposed on the main body 130 .

Referring to the drawings, the cleaner 100 may use an ultrasonic sensor to sense the distance between the connection part 120 and the main body 130 .

To this end, as shown in FIG. 2A , a first ultrasonic sensor 320a may be disposed near the handle 11 disposed on the connection part 120 .

In addition, second to third ultrasonic sensors 320b and 320c may be disposed at the rear of the main body 130 , and a fourth ultrasonic sensor 320c may be disposed at the front of the main body 130 .

Each of the ultrasonic sensors 320a, ..., 320d may include an ultrasonic output unit (not shown) and an ultrasonic receiver (not shown), respectively, and, for example, a first ultrasonic sensor disposed in the connection unit 120 . The second to fourth ultrasonic sensors 320b, ..., 320d) disposed on the main body 130 receive the ultrasonic waves output from the 320a, and the distance between the connecting part 120 and the main body 130 is received. can detect

FIG. 3 illustrates calculating the distance between the main body and the connection part of FIG. 1 .

Referring to the drawings, when the user 300 performs cleaning while pushing the handle 115 , foreign substances are transferred to the dust container 140 in the body 130 through the suction port 110 and the connection part 120 . do.

Meanwhile, as shown in FIG. 2 , the ultrasonic waves output from the first ultrasonic sensor 320a disposed on the connection unit 120 , the second to fourth ultrasonic sensors 320b , ..., 320d disposed on the main body 130 . )), the distance Dis between the connection part 120 and the main body 130 may be sensed.

In particular, the controller 310 may calculate a distance between the connection unit 120 and the main body 130 based on the received ultrasound signal.

FIG. 4 is a block diagram schematically illustrating the inside of the cleaner shown in FIG. 1 .

Referring to the drawings, the cleaner 100 of FIG. 4 may include a fan 142 , a fan driving unit 143 , a battery 230 , and a control unit 310 . In addition, the cleaner 100 may further include an AC power detection unit 315 , a sensor unit 320 , a communication unit 330 , a traveling unit 144 , a traveling driving unit 145 , and an input unit 117 . .

The input unit 117 may include a plurality of operation buttons, and may transmit input signals such as operation on/off of the cleaner 100 and control of the fan rotation speed by a user operation to the control unit 310 .

When AC power is input to the inside of the cleaner 100 , the AC power detection unit 315 detects the input AC power. To this end, the AC power detection unit may include an AC current detection unit or an AC voltage detection unit.

As the AC power detection unit, a current transformer (CT), a shunt resistor, or the like may be used, and as the AC voltage detection unit, a voltage transformer (VT), a shunt resistor, or the like may be used.

For example, when the power cord 107 of the cleaner 100 is connected to the power outlet, or when the power cord 107 is connected to the message outlet, the operation is inputted by the user's manipulation of the input unit 117 . In this case, AC power is input to the inside of the cleaner 100 , and the AC power detection unit 15 may detect whether AC power is input.

Meanwhile, when AC power is sensed, the detection signal may be transmitted to the controller 310 .

The sensor unit 320 may include an ultrasonic sensor or the like to detect a distance between the main body 130 and the connection unit 120 .

As described in FIG. 2 , the sensor unit 320 includes a first ultrasonic sensor 320a disposed on the connection part 120 , and second to fourth ultrasonic sensors 320b , .. .320d) may be provided. Meanwhile, the signal sensed by the sensor unit 320 may be transmitted to the control unit 310 .

The communication unit 330 may wirelessly exchange data with a peripheral external device. For example, a wireless communication unit (not shown) may be provided to enable wireless communication with an AP device (not shown). Here, the wireless communication unit (not shown) may perform WiFi communication. The communication unit 330 may perform wireless data communication with a mobile terminal (not shown) through an AP device (not shown).

The fan 142 rotates by the driving force of the motor. To drive the fan 142 , a fan drive 143 is used.

The fan driving unit 143 transmits a rotational force to the fan 142 .

The fan driving unit 143 drives the fan 142 based on AC power input when operating in the AC power mode, and operates the fan 142 based on DC power stored in the battery 230 when operating in the DC power mode. can drive In this case, the fan driving unit 143 may vary the output of the motor driving the fan 142 in proportion to the distance between the main body 130 and the connection unit 120 . Thereby, it becomes possible to reduce the power consumption of the battery.

As the distance between the main body 130 and the connecting unit 120 increases, the fan driving unit 143 increases the motor output for driving the fan 142 , and the distance between the main body 130 and the connecting unit 120 decreases. As possible, the output of the motor driving the fan 142 may be reduced.

To this end, the fan driving unit 143 includes a converter ( 410 in FIG. 5 ) that converts AC power to DC power, and a switching unit ( FIG. 5 ) that outputs any one of DC power from the converter and DC power from the battery 230 . 5 415), an inverter (420 in FIG. 5) including a plurality of switching elements, converting the DC power output from the switching unit 415 into a predetermined AC power by a switching operation, and driving the fan 142 ) may be further included.

In addition, the fan driving unit 143 may further include an inverter control unit 430 , a current detection unit, and the like. The description of the fan driving unit 143 will be described in more detail with reference to FIG. 5 .

The traveling unit 144 may drive the vacuum cleaner. To this end, the driving unit 144 may include a left wheel 176 and a right wheel 177 shown in FIG. 1 . On the other hand, in order to drive the traveling unit 144 , the traveling driving unit 145 is used.

The traveling driving unit 145 may include a motor for transmitting rotational force to the traveling unit 144 , a motor control unit for controlling the motor, and the like.

In particular, the traveling driving unit 145 may transmit a rotational force to the traveling unit 144 based on the distance between the main body 130 and the connecting unit 120 .

For example, when the distance between the main body 130 and the connecting unit 120 is equal to or greater than the first distance, the driving driving unit 145 operates so that the main body 130 follows the connecting unit 120 , and the driving unit 144 . can transmit rotational force. Accordingly, the distance between the main body 130 and the connection part 120 is maintained within a predetermined distance.

The controller 310 may control each unit inside the cleaner 100 , respectively.

The controller 310 controls the fan 142 to be driven based on the AC power input when operating in the AC power mode, and when operating in the DC power mode, the fan 142 based on the DC power stored in the battery 230 to drive the fan drive unit 143 or the fan 144 may be controlled. In this case, the control unit 310 controls the fan driving unit 143 or the fan 144 to vary the output of the motor driving the fan 142 in proportion to the distance between the main body 130 and the connection unit 120 . can do. Thereby, it becomes possible to reduce the power consumption of the battery.

The control unit 310 calculates the distance between the connection unit 120 and the main body 130 based on the first ultrasonic sensor 320a and the second to fourth ultrasonic sensors 20b, ... 320d. .

Then, the control unit 310 calculates the distance between the main body 130 and the connection unit 120, and operates the fan driving unit 143 to vary the output of the motor driving the fan 142 in proportion to the calculated distance. can be controlled

The controller 310 increases the motor output for driving the fan 142 as the distance between the main body 130 and the connecting unit 120 increases, and as the distance between the main body 130 and the connecting unit 120 decreases, , the fan driving unit 143 or the fan 144 may be controlled to reduce the motor output driving the fan 142 .

Meanwhile, the control unit 310 may control the driving driving unit 145 based on the distance between the main body 130 and the connecting unit 120 .

For example, when the distance between the main body 130 and the connecting unit 120 is greater than or equal to the first distance, the controller 310 may control the driving driving unit 145 such that the main body 130 follows the connecting unit 120 . can Accordingly, the distance between the main body 130 and the connection part 120 is maintained within a predetermined distance.

5 is a circuit diagram illustrating a fan driving unit of the cleaner of FIG. 4 .

Referring to the drawings, the fan driving unit 143 of the cleaner according to the embodiment of the present invention includes a converter 410, an inverter 420, an inverter control unit 430, a dc terminal voltage detection unit B, a smoothing capacitor ( C), and an output current detection unit (E). In addition, the fan driving unit 143 may further include an input current detection unit A, a reactor L, and the like.

The reactor L is disposed between the commercial AC power source 405, v _s and the converter 410, and performs a power factor correction or a step-up operation. In addition, the reactor L may perform a function of limiting the harmonic current caused by the high-speed switching of the converter 410 .

Input current detection section (A), it is possible to detect the input current (i _s) to be inputted from the commercial AC power source 405. To this end, as the input current detection unit A, a current transformer (CT), a shunt resistor, or the like may be used. The detected input current i _s may be input to the inverter controller 430 as a discrete signal in the form of a pulse.

Meanwhile, the input current detection unit A may be the AC power detection unit 315 of FIG. 4 .

The converter 410 converts the commercial AC power 405 through the reactor L into a DC power and outputs it. Although the figure shows the commercial AC power source 405 as a single-phase AC power source, it may be a three-phase AC power source. The internal structure of the converter 410 also varies according to the type of the commercial AC power source 405 .

Meanwhile, the converter 410 may be made of a diode or the like without a switching element, and may perform a rectification operation without a separate switching operation.

For example, in the case of a single-phase AC power supply, four diodes may be used in the form of a bridge, and in the case of a three-phase AC power, six diodes may be used in the form of a bridge.

Meanwhile, as the converter 410, for example, a half-bridge converter in which two switching elements and four diodes are connected may be used, and in the case of a three-phase AC power supply, six switching elements and six diodes may be used. .

When the converter 410 includes a switching element, a step-up operation, a power factor improvement, and a DC power conversion may be performed by a switching operation of the corresponding switching element.

The switching unit 415 is electrically connected to the converter 410 and the battery 230, and switches to output the DC power from the converter 410 in the AC power mode, and in the DC power mode, the battery ( 230) to output the DC power.

In the switching unit 415 , when the level of the AC power sensed by the AC power detection unit 315 is equal to or greater than a predetermined value, the switching unit 415 outputs the DC power from the converter 410 , and the AC power level is When the value is less than the predetermined value, the switching unit 415 outputs DC power from the battery 230 .

The smoothing capacitor C smoothes the input power and stores it. In the drawings, one device is exemplified as the smoothing capacitor C, but a plurality of devices may be provided to ensure device stability.

Meanwhile, since DC power is stored at both ends of the smoothing capacitor C, it may be referred to as a dc terminal or a dc link terminal.

The dc end voltage detector B may detect the dc end voltage Vdc that is both ends of the smoothing capacitor C. To this end, the dc terminal voltage detection unit B may include a resistance element, an amplifier, and the like. The detected dc terminal voltage Vdc may be input to the inverter controller 430 as a discrete signal in the form of a pulse.

The inverter 420 includes a plurality of inverter switching elements, and converts a DC power supply (Vdc) smoothed by an on/off operation of the switching elements into a three-phase AC power supply (va, vb, vc) of a predetermined frequency, three-phase output to the synchronous motor 142 .

Inverter 420 is a pair of upper-arm switching elements (Sa, Sb, Sc) and lower-arm switching elements (S'a, S'b, S'c) connected in series with each other, and a total of three pairs of upper and lower arms The switching elements are connected in parallel with each other (Sa&S'a, Sb&S'b, Sc&S'c). A diode is connected in anti-parallel to each of the switching elements Sa, S'a, Sb, S'b, Sc, and S'c.

The switching elements in the inverter 420 turn on/off the respective switching elements based on the inverter switching control signal Sic from the inverter controller 430 . Accordingly, the three-phase AC power having a predetermined frequency is output to the three-phase synchronous motor 142 .

The inverter controller 430 may control a switching operation of the inverter 420 . To this end, the inverter control unit 430 may receive _{an output current i o detected by the output current detection unit E .}

The inverter control unit 430 outputs the inverter switching control signal Sic to the inverter 420 in order to control the switching operation of the inverter 420 . The inverter switching control signal Sic is a pulse width modulation (PWM) switching control signal, and is generated and output based _{on the output current value i o detected by the output current detection unit E .}

To this end, the inverter control unit 430 includes an axis converting unit (not shown), a speed calculating unit (not shown), a current command generating unit (not shown), a voltage command generating unit (not shown), and an axis converting unit (not shown). , and a switching control signal output unit (not shown).

The axis conversion unit (not shown) receives the three-phase output current (ia, ib, ic) detected by the output current detection unit (E) and converts it into the two-phase current (iα, iβ) of the stationary coordinate system.

On the other hand, the axis conversion unit (not shown) may convert the two-phase currents (iα, iβ) of the stationary coordinate system into the two-phase currents (id, iq) of the rotational coordinate system.

)와 연산된 속도(

)를 출력할 수 있다.The speed calculating unit (not shown) is based on the two-phase currents (iα, iβ) of the stationary coordinate system changed by the axis converting unit (not shown), the calculated position (

) and the calculated speed (

) can be printed.

)와 속도 지령치(ω^* _r)에 기초하여, 전류 지령치(i^* _q)를 생성한다. 예를 들어, 전류 지령 생성부(미도시)는, 연산 속도(

)와 속도 지령치(ω^* _r)의 차이에 기초하여, PI 제어기(미도시)에서 PI 제어를 수행하며, 전류 지령치(i^* _q)를 생성할 수 있다. On the other hand, the current command generation unit (not shown), the calculation speed (

) and the speed command value (ω ^* _r ), a current command value (i ^* _q ) is generated. For example, the current command generation unit (not shown) may

) and the speed command value (ω ^* _r ), the PI controller (not shown) performs PI control, and the current command value (i ^* _q ) can be generated.

Next, the voltage command generation unit (not shown) includes the d-axis and q-axis currents (i _d ,i _q ) transformed into the two-phase rotational coordinate system by the axis transformation unit, and the current from the current command generation unit (not shown), etc. Based on the command values (i ^* _d ,i ^* _q ), d-axis and q-axis voltage command values (v ^* _d ,v ^* _q ) are generated.

On the other hand, the generated d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) are input to the axis conversion unit (not shown).

)와, d축, q축 전압 지령치(v^* _d,v^* _q)를 입력받아, 축변환을 수행한다.The axis conversion unit (not shown) is a position (not shown) calculated by the speed calculating unit (not shown).

) and d-axis and q-axis voltage command values (v ^* _d ,v ^* _q ) are received and axis transformation is performed.

)가 사용될 수 있다.First, the axis transformation unit (not shown) performs transformation from the two-phase rotation coordinate system to the two-phase stationary coordinate system. At this time, the position calculated by the speed calculating unit (not shown) (

) can be used.

Then, the axis transformation unit (not shown) performs transformation from the two-phase stationary coordinate system to the three-phase stationary coordinate system. Through this conversion, the shaft conversion unit (not shown) outputs a three-phase output voltage command value (v ^* a, v ^* b, v ^* c).

A switching control signal output unit (not shown) outputs a switching control signal (Sic) for an inverter according to a pulse width modulation (PWM) method based on ^{a three-phase output voltage command value (v *} a, v ^* b, v ^{* c).} create and print

The output inverter switching control signal Sic may be converted into a gate driving signal by a gate driver (not shown) and input to a gate of each switching element in the inverter 420 . Accordingly, each of the switching elements Sa, S'a, Sb, S'b, Sc, and S'c in the inverter 420 performs a switching operation.

_{The output current detection unit E detects the output current i o} flowing between the inverter 420 and the three-phase motor 142 . That is, the current flowing through the motor 142 is detected. The output current detection unit E may detect all of the output currents ia, ib, and ic of each phase, or may detect the output currents of the two phases using three-phase balance.

On the other hand, the three-phase motor 142 includes a stator and a rotor, and each phase AC power of a predetermined frequency is applied to the coils of the stators of each phase (a, b, c phase), and the rotor rotates. will do

The control unit 310 may control the inverter control unit 320 and the switching unit 415 .

Specifically, the control unit 310, the switching unit 415, when the level of the AC power sensed by the AC power detection unit 315 is equal to or higher than a predetermined value, the switching unit 415 controls the DC power from the converter 410. It controls to output, and when the level of AC power is less than a predetermined value, the switching unit 415 controls to output DC power from the battery 230 .

6 is a diagram illustrating a motor output variable according to a distance between the main body and a connection part, FIG. 7 illustrates a motor output variable waveform, and FIG. 8 illustrates a relationship between a distance and a motor speed.

First, (a) of FIG. 6 illustrates a first mode (mode 1) in which the user advances the connection unit 120 and the suction port 110 forward. In this case, the distance between the connection part 120 and the main body 130 is increased. In the drawing, the first distance Dis1 is exemplified.

Next, FIG. 6B illustrates a second mode (mode 2) in which the user moves the connection unit 120 and the suction port 110 backward. In this case, the distance between the connection part 120 and the main body 130 becomes close. The drawing illustrates the second distance Dis2.

When users use the cleaner 100 , they use the cleaner to remove foreign substances while pushing the connection part 120 and the suction port 110 forward. On the other hand, in the case of pulling back the connection part 120 and the suction port 110 , it is mainly used to change the direction or to keep the distance from the main body 130 away.

In the present invention, using this point, when the cleaner 100 operates only with the DC power of the battery 230 , a technique for reducing the power consumption of the battery 230 is proposed.

The control unit 310 calculates the distance between the main body 130 and the connection unit 120 and controls the fan driving unit 143 to vary the output of the motor driving the fan 142 in proportion to the calculated distance. .

Accordingly, the fan driving unit 143 varies the output of the motor driving the fan 142 in proportion to the distance between the main body 130 and the connection unit 120 .

As the distance between the main body 130 and the connecting unit 120 increases, the fan driving unit 143 increases the motor output for driving the fan 142 , and the distance between the main body 130 and the connecting unit 120 decreases. As much as possible, the motor power driving the fan 142 is reduced.

In FIG. 7 , when the user advances the connection unit 120 and the suction port 110 forward in the first mode (mode 1), the speed of the motor operating the fan is increased by the control of the fan driving unit 1443 . exemplify that

In addition, in FIG. 7, when the user is in the second mode (mode 2) in which the user moves the connection unit 120 and the suction port 110 backward, under the control of the fan driving unit 1443, the speed of the motor operating the fan is, exemplifies a decrease. Accordingly, the power consumption of the battery 230 is reduced.

That is, as shown in FIG. 8 , the control unit 310 may control the motor speed to increase in proportion to the distance between the connection unit 120 and the main body 130 .

As such, by varying the output of the motor driving the fan in proportion to the distance between the main body 130 of the cleaner 100 and the connection part 120 , it is possible to reduce power consumption of the battery.

The cleaner according to the present invention is not limited to the configuration and method of the described embodiments as described above, but the embodiments are configured by selectively combining all or part of each embodiment so that various modifications can be made. could be

In addition, although preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present invention as claimed in the claims Various modifications are possible by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

Claims (8)

a body generating suction force;
and a connection part for transferring the suction force generated from the main body to the suction port;
The body is
battery;
a fan generating suction force by rotation;
a fan driving unit for driving the fan based on AC power input when operating in AC power mode, and driving the fan based on DC power stored in the battery when operating in DC power mode;
The fan drive unit,
In proportion to the distance between the main body and the connection part, the output of the motor driving the fan is varied,
The fan drive unit,
While the fan is driven based on the DC power stored in the battery, the speed of the fan is increased in a first mode in which the connection unit advances forward, and in a second mode in which the connection unit moves backward, the speed of the fan is decreased make it,
According to repetition of the first mode and the second mode, the output waveform of the fan corresponds to a sine wave waveform. According to claim 1,
The fan drive unit,
As the distance between the main body and the connection part increases, the motor output for driving the fan increases, and as the distance between the body and the connection part decreases, the motor output for driving the fan decreases. . According to claim 1,
a control unit for calculating a distance between the main body and the connection unit and controlling the fan driving unit to vary an output of a motor driving the fan in proportion to the calculated distance; Cleaner further comprising. 4. The method of claim 3,
a first ultrasonic sensor disposed on the connection part; and
A second ultrasonic sensor disposed on the main body; further comprising,
The control unit is
The cleaner according to claim 1, wherein the distance between the connection part and the main body is calculated based on the first ultrasonic sensor and the second ultrasonic sensor. 4. The method of claim 3,
a driving unit for moving the main body; and
Further comprising; a driving driving unit for driving the driving unit;
The control unit is
Based on the distance between the main body and the connection part, the cleaner characterized in that for controlling the driving driving unit. According to claim 1,
The fan drive unit,
a converter converting the AC power into DC power;
a switching unit for outputting any one of the DC power from the converter and the DC power from the battery;
The cleaner comprising: an inverter having a plurality of switching elements, converting the DC power output from the switching unit into a predetermined AC power by a switching operation, and driving a motor rotating the fan . 7. The method of claim 6,
an AC power detection unit sensing the AC power; and
When the level of the AC power detected by the AC power sensor is equal to or higher than a predetermined value, the switching unit controls to output the DC power from the converter, and when the level of the AC power is less than the predetermined value, the switching unit controls the battery The cleaner further comprising a; a control unit for controlling to output the DC power from the . 7. The method of claim 6,
The cleaner according to claim 1, further comprising: an inverter controller configured to control the inverter based on an output current flowing through a motor that rotates the fan.

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