JP2002360484A - Electric vacuum cleaner - Google Patents

Abstract

(57) [Problem] To provide an electric vacuum cleaner which prolongs the use time per charge of a secondary battery without unnecessarily reducing the suction force of an electric blower. SOLUTION: A battery voltage of a battery is detected by a voltage detecting means, and it is determined whether a detected voltage V is higher than a voltage V1, lower than a voltage V1, higher than a voltage V2, lower than the voltage V2, higher than a voltage V3, or lower than a voltage V3. I do. Control is performed in a preset state of 100%, 98%, 95%, and 90%, respectively. In a state where the voltage of the battery is high, the electric blower is driven low, so that the discharging time of the battery per charge is lengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner for driving an electric blower with a battery.

[0002]

2. Description of the Related Art In recent years, electric vacuum cleaners in which an electric blower is driven by a secondary battery are becoming widespread.

[0003] In the case of using a secondary battery as a power source, the drive current of the electric blower changes due to a change in the voltage of the secondary battery. Further, the voltage of the secondary battery decreases with the time during which the electric blower is driven, but when the secondary battery is fully charged, the time during which the voltage is high is particularly long.

[0004] When the voltage of the secondary battery is high as described above, the suction power of the electric blower is large, but the power is consumed more than necessary, and the time that can be used in one charge is reduced.

[0005] In addition, the drive current of the electric blower changes due to variations in the production lot of the electric blower, clogging of dust, and the like.

[0006] In the case of an electric blower having a large drive current, although the suction force of the electric blower is large, the electric blower consumes more power than necessary, and the time that can be used in one charge is reduced.

Further, depending on the state, the drive current of the electric blower increases, and the suction force of the electric blower increases, but the power is consumed more than necessary, and the time that can be used in one charge is shortened.

Further, the discharge capacity of the secondary battery differs depending on the temperature. At high temperatures, the activation becomes high and the discharge time becomes short. On the contrary, at low temperatures, the activation becomes low and the discharge time becomes short. If the battery is used outside the range as usual, the time that can be used on one charge is reduced.

[0009]

As described above, when the voltage of the secondary battery is high, when the current of the electric blower is large,
Alternatively, when the temperature of the secondary battery is out of the predetermined range, there is a problem that the usable time in one charge of the secondary battery is shortened.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides a vacuum cleaner that can extend the use time per charge of a secondary battery without unnecessarily reducing the suction force of an electric blower. The purpose is to do.

[0011]

According to a first aspect of the present invention, there is provided an electric vacuum cleaner in which electric power is supplied by a battery, voltage detecting means for detecting a voltage of the battery, and electric power supplied from the battery to the electric blower. A switching element for controlling the power to be supplied, and controlling the switching element when the voltage of the battery detected by the voltage detecting means is equal to or higher than a predetermined value and controlling the switching element as compared with the case where the battery voltage is lower than the predetermined value to reduce the average on-duty. Control means for reducing the voltage of the battery with the voltage detecting means, and the control means determines that the voltage of the battery detected by the voltage detecting means is smaller than the predetermined value when the voltage of the battery is equal to or higher than the predetermined value. By controlling the switching element to reduce the average on-duty compared to the case,
The voltage detection means is generally simple in construction, reduces the power supplied from the battery without significant loss,
By lowering the voltage higher than necessary, the discharge time of the battery is extended while the output of the electric blower is appropriate.

According to a second aspect of the present invention, there is provided a vacuum cleaner, wherein an electric blower supplied with electric power by a battery, current detecting means for detecting a current of the electric blower, and electric power supplied from the battery to the electric blower are controlled. Control means for controlling the switching element to reduce the average on-duty when the current of the electric blower detected by the current detection means is equal to or greater than a predetermined value, as compared to when the current is smaller than the predetermined value. When the current of the electric blower detected by the current detecting means is equal to or more than a predetermined value, the control means detects the current of the electric blower by the current detecting means. By controlling the switching element to reduce the average on-duty, the electric blower current can be reduced without significant loss, By reducing the current in the above,
Since the discharge time of a battery is determined substantially by the product of current and time, the discharge time of the battery is prolonged when the output of the electric blower is appropriate.

According to a third aspect of the present invention, there is provided an electric vacuum cleaner in which electric power is supplied by a battery, temperature detecting means for detecting a temperature of the battery, and electric power supplied from the battery to the electric blower. A switching element, and control means for controlling the switching element when the temperature of the battery detected by the temperature detection means is out of a predetermined range, to reduce the average on-duty as compared with a case in which the temperature is within the predetermined range. The battery temperature is detected by the temperature detecting means, and the control means controls the switching element when the temperature of the battery detected by the temperature detecting means is outside the predetermined range as compared with the case where the temperature is outside the predetermined range. By controlling and reducing the average on-duty, the amount of discharge from the battery can be reduced without causing a large loss, and the battery can be discharged while the output of the electric blower is appropriate. Between longer.

According to a fourth aspect of the present invention, there is provided an electric blower which is supplied with electric power by a battery, a switching element which controls electric power supplied from the battery to the electric blower, and a performance of the electric blower. Storage means for storing the control state, and setting means for setting the control state stored in the storage means corresponding to the performance of the electric blower to be used. The control state stored in the storage means corresponding to the performance is set, and the control means controls the switching element in accordance with the control state set by the setting means. Then, the battery is driven in an appropriate state corresponding to the electric blower to be used to extend the discharge time of the battery.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment of the vacuum cleaner of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, reference numeral 1 denotes a cleaner main body. The cleaner main body 1 has a case body 2 and a rear part connected to an upper part of the case body 2 so that the upper part can be opened by rotation. And a main body case 4 having a lid 3 attached thereto. In the case body 2, an electric blower 5 shown in FIG. 2 and an IC 30 also serving as a control means for controlling the electric blower 5 are housed, and a battery 7 as a secondary battery is housed as a power source for these. Have been. here,
The IC 30 also serves as storage means for storing control states corresponding to the performances of the electric blower 5 respectively.

Further, a main body suction port 11 is opened forward on the front lower surface of the lid 3 of the main body case 4, and a substantially Y-shaped handle 12 is provided on the upper surface of the lid 3 in plan view. I have.

A dust cup 14 as a bottomed cylindrical dust collection cup is detachably attached to the front side of the main body case 4 in the case body 2.

Further, a base end of a flexible hose body 15 is connected to the main body suction port 11 of the cleaner main body 1 so as to be detachably connected thereto. At the end of the hose body 15, a hand operation unit 16 is provided as operation means bent in a substantially rectangular shape. In a portion facing the base end side of the bent portion of the hand operation unit 16, a stop setting button 21, a weak setting button 22, and a strong setting button 23 for setting a driving state of the electric blower 5 and the like are arranged in a line. Is provided.

A replaceable suction port 25 is detachably connected to the distal end of the manual operation section 16 of the hose body 15 via an extension pipe 24 as an extendable connection pipe.
A rotating brush 26 having an axial direction in the longitudinal direction is accommodated therein, and the rotating brush 26 is rotationally driven by an electric motor 27.

Next, a circuit configuration of the vacuum cleaner will be described with reference to FIG.

As shown in FIG. 3, an electric blower 5, a source and a drain of a field effect transistor Q1 as a switching element and a resistor R1 are connected in series to a battery 7, and a capacitor C1 is connected in parallel to the resistor R1. Connected
The connection point between the field effect transistor Q1 and the resistor R1 as current detection means is connected to the input terminal R1 of the IC 30.
The collector of the transistor Q2 is connected to the gate of the field effect transistor Q1, the emitter of the transistor Q2 is connected to the positive electrode of the battery 7, the base is connected to the collector of the transistor Q3 via the resistor R2, and the emitter of the transistor Q3 Is grounded, and the base is connected to I through a resistor R3.
It is connected to the output terminal P1 of C30.

Further, a constant voltage means 31 is connected to the battery 7. The constant voltage means 31 is connected to the resistor R4, the capacitor C2, the three-terminal regulator 32 and the capacitor C3 at the positive electrode of the battery 7, and outputs a constant voltage of 5V.

Further, the switch means 33 of the suction port body 25, the electric motor 27 and the resistor 27 are connected to the battery 7 via the emitter, collector and hose body 15 of the control transistor Q4.
A series circuit of R5 is connected, and a capacitor C4 is connected in parallel to the resistor R5. And the motor 27 and the resistance
The connection point of R5 is connected to the input terminal R2 of the IC 30.
Further, a series circuit of a resistor R6 and a light emitting diode LED1 for driving display is connected to the motor 27. The switch means 33 is provided on the suction port body 25, and the suction port body 25
The suction port body 25 is closed when it is grounded, and is opened when it is not grounded by the surface-to-be-cleaned detecting means for detecting whether or not is grounded.

The base of the transistor Q4 is connected to the collector of the transistor Q5 via the resistor R7, the emitter of the transistor Q5 is grounded, and the base is connected to the output terminal P2 of the IC 30 via the resistor R8.

Further, the hand operating section 16 of the hose body 15 includes a series circuit of a normally open switch 34 and a pull-down resistor R11, a series circuit of a normally open weak switch 35 and a pull-down resistor R12, A series circuit of an open force switch 36 and a pull-down resistor R13 and a resistor R14 are connected in parallel. One end is grounded, and the other end is connected to the input terminal R3 of the IC 30. Further, to the input terminal R3, a connection point of the resistor R15 and the resistor R16 of a series circuit of the resistor R15 and the resistor R16 connected between the constant voltage means 31 and the ground is connected, and a capacitor C5 is connected in parallel to the resistor R16. It is connected. And the switch for cutting 34 and the switch for weak 35
The power switch 36 is operated by the stop setting button 21, the weak setting button 22, and the strong setting button 23 of the manual operation unit 16, respectively.

A thermistor 37 as temperature detecting means for detecting the temperature of the battery 7 is connected between the negative electrode of the battery 7 and the input terminal R4 of the IC 30.
The 30 input terminal R4 has a resistor R17 connected to the constant voltage means 31.
It is connected to the connection point between the resistor R17 and the capacitor C6 in the series circuit of the grounded capacitor C6.

A resistor R1 is connected between the constant voltage means 31 and the ground.
8 and a series circuit of the switch S1 are connected, a connection point of the resistor R18 and the switch S1 is connected to the input terminal R5 of the IC 30, and a series circuit of the resistor R19 and the switch S2 is connected between the constant voltage means 31 and the ground. The connection point of the resistor R19 and the switch S2 is connected to the input terminal R6 of the IC 30, and constitutes the setting means 38.

Then, the motor rank, the switching setting and the ratio of the drive output to the input power P are set as shown in Table 1. That is, as shown in FIG. 4, the input power P of the motor of the electric blower 5 is substantially normally distributed with respect to the number of motors of the electric blower 5 and is not always constant. The field effect transistor Q1 is controlled by the IC 30 as shown in Table 1 so as not to supply the electric power.

[0030]

[Table 1]

In this setting, when the switch S1 is short-circuited, the input terminal R5 of the IC 30 goes to the L level and the switch S1 is opened according to the motor rank based on the input power P that has been checked for each electric blower 5 in advance. Then, the input terminal R5 of the IC 30 becomes H level, and when the switch S2 is short-circuited, the IC 30
When the input terminal R6 of the IC 30 goes to L level and the switch S2 is opened, the input terminal R6 of the IC 30 goes to H level, and control is performed at an appropriate ratio according to the input power P of the electric blower 5.

The battery 7 is provided with a voltage detecting means.
A series circuit of a resistor R21 and a resistor R22 constituting 39 is connected in parallel, and a connection point of the resistors R21 and R22 is connected to an input terminal R7 of the IC 30.

Here, the basic operation of the circuit shown in FIG. 3 will be described.

First, the voltage of the battery 7 is set to a constant voltage of 5 V by the constant voltage means 31, and is applied to the IC 30.

Then, the weak setting button 22 of the hand operation unit 16 is set.
Alternatively, by operating the strong setting button 23, the weak switch 35 or the strong switch 36 is closed, and the electric blower 5 is driven. In this case, control is performed at a rate according to the motor rank shown in Table 1 set by the setting means 38.

That is, when the output terminal P1 of the IC 30 goes high, a base current flows through the transistor Q3 to turn on the transistor Q3. When the transistor Q3 turns on, the base of the transistor Q2 goes low and the transistor Q2
Is turned on, a voltage is applied to the gate of the field effect transistor Q1, the field effect transistor Q1 is turned on, and the electric blower 5 is driven.

Further, by changing the on-duty of the pulse current applied to the base of the transistor Q3, the drive of the electric blower 5 is changed, for example, to a strong or weak drive. In this case, as the on-duty is larger, the electric blower 5 is driven and operated more strongly. When the electric blower 5 is driven with high power, the transistor Q3 is kept on.

On the other hand, by operating the stop setting button 21, the cut-off switch 34 is closed and the electric blower 5 is stopped.

When the output terminal P2 of the IC 30 goes high, a base current is supplied to the transistor Q5 to turn on the transistor Q5. When the transistor Q5 turns on, the base of the transistor Q4 goes low and the transistor Q5 goes low.
Q4 turns on. When the suction opening 25 is in contact with the floor to be cleaned, the switch means 33 is closed, and the electric motor 27 rotates to drive the rotary brush 26.

On the other hand, when the suction port 25 is not in contact with the floor, the switch means 33 is opened, so that the electric motor 27 stops rotating and the rotating brush 26 stops.

Since the input terminal R2 of the IC 30 has a function as a current detecting means, it is determined whether or not the electric motor 27 is driven, that is, whether or not the suction port 25 is grounded on the floor. , The drive current flowing through the electric motor 27 is detected and detected. For example, when the motor 27 is rotating, the drive current flows, so that it is determined that the suction port 25 is grounded to the floor. When the motor 27 is not rotating, the drive current does not flow, so the suction port 25 does not flow. Judge that is not touching the floor.

When it is determined that the suction port 25 is grounded on the floor, the electric blower 5 is rotated as it is, and it is determined that the suction port 25 is not grounded on the floor. If so, the rotation of the electric blower 5 is reduced or stopped.

When the voltage of the battery 7 is detected by the voltage detecting means 39 and the voltage of the battery 7 is higher than a predetermined value, the on-duty of the field effect transistor Q1 is made smaller than usual, and Reduce output.

Further, a current corresponding to the current flowing through the electric blower 5 is detected by the resistor R1 serving as current detecting means, and when the current flowing through the electric blower 5 is higher than a predetermined value, the current of the field effect transistor Q1 is higher than usual. The output of the electric blower 5 is reduced by reducing the on-duty.

Further, when the temperature of the battery 7 rises, the resistance value of the thermistor 37 changes, and
When the voltage input to the input terminal R4 of the terminal 30 changes and the temperature of the battery 7 rises by a predetermined value or more, the drive of the electric blower 5 is reduced or stopped.

Next, the flow of the entire operation will be described with reference to the flowchart shown in FIG.

First, an initial value of t = 90 is set (step 1). Here, t is a continuation timer, which increases in a predetermined state.

Next, it is determined whether or not the stop setting button 21 has been operated to close the cut-off switch 34 (step 2). If the cut-off switch 34 has been closed, the electric blower 5 is turned off. The motor 27 is stopped (step 3), and the motor 27 is stopped (step 4). Thereafter, an initial value of t = 90 is set (step 5), and the process returns to step 2.

If it is determined in step 2 that the switch 34 is not closed, the weak setting button 22
Is operated to determine whether the weak switch 35 is closed (step 6). If the weak switch 35 is closed, the electric blower 5 is driven at 50% (step 7). The motor 27 is driven (step 8), and step 5
Proceed to.

If it is determined in step 6 that the weak switch 35 has not been closed, the strong setting button
23 is operated to determine whether the overuse switch 36 is closed (step 9).
0), and return to step 2.

Here, the strong processing based on the voltage of the battery 7 in step 10 will be described with reference to FIG.

The strong processing shown in FIG. 1 is a processing for a change in the voltage of the battery 7 due to the battery 7, the electric blower 5 or clogging of dust. Note that, in the case of the strong processing shown in FIG.
It is not necessary to set an initial value of = 90.

First, the battery voltage of the battery 7 is detected by the voltage detecting means 39 (step 11), and it is determined whether or not the detected voltage V is equal to or higher than the voltage V1 (step 12). If it is smaller, the IC 30 controls the field effect transistor Q1 to control the electric blower 5 in a preset 100% state (step 13) and returns.

In step 12, the detection voltage V is set to the voltage V1.
If it is determined that the detected voltage V is equal to or greater than
It is determined whether the voltage is equal to or greater than 2 (step 14). If the detected voltage V is smaller than the voltage V2, the IC 30 controls the field effect transistor Q1 to operate the electric blower 5 in a preset 98% state. (Step 15) and return.

Further, in step 14, the detection voltage V is
If it is determined that the voltage is not less than 2, it is determined whether or not the detected voltage V is not less than the voltage V3 (step 16). To control the electric blower 5 in a preset 95% state (step 17), and return.

On the other hand, in step 16, the detection voltage V is changed to the voltage V3.
If it is determined that this is the case, the IC 30 controls the field effect transistor Q1 to control the electric blower 5 in a preset 90% state (step 18), and returns.

As described above, by detecting the voltage of the battery 7 and controlling the output of the electric blower 5,
When the voltage of the battery 7 is high and the battery 7 is discharged in a short time t1 or t2 as shown by the solid line l1 or the solid line l2 in FIG. As a result, as shown by a broken line l3, the discharging time of the battery 7 by one charge is set to, for example, a time t.
Can be lengthened to 3. Further, since the detection of the voltage of the battery 7 is easy, the configuration is not particularly complicated.

Next, the strong processing based on the current of the electric blower 5 in step 10 will be described with reference to FIG.

The strong processing shown in FIG. 7 is performed by the battery 7, the electric blower 5, or the electric blower 5
This is a process for the fluctuation of the voltage of the battery 7 including the process for the current of In the case of the strong processing shown in FIG. 1, it is not necessary to set an initial value of t = 90 in steps 1 and 5.

First, the current flowing through the electric blower 5 is detected by the resistor R1 as current detecting means (step 21).
It is determined whether I is equal to or greater than the current I1 (step 22).
If the detected current I is smaller than the current I1, the IC 30 controls the field effect transistor Q1 to control the electric blower 5 in a preset 100% state (step 23).
To return.

In step 22, the detected current I is the current I1
If it is determined that the above is the case, the detected current I becomes the current I
It is determined whether or not the current is greater than or equal to 2 (step 24). If the detected current I is smaller than the current I2, the IC 30 controls the field effect transistor Q1 to operate the electric blower 5 in a preset 98% state. (Step 25) and return.

Further, at step 24, the detected current I is
If it is determined that the current is not less than 2, it is determined whether or not the detected current I is not less than the current IV3 (step 26). If the detected current I is smaller than the current I3, the IC 30 is connected to the field effect transistor Q1. To control the electric blower 5 in a preset 95% state (step 27), and return.

On the other hand, at step 26, the detected current I is
If it is determined that this is the case, the IC 30 controls the field effect transistor Q1 to control the electric blower 5 in a preset 90% state (step 28), and returns.

As described above, by detecting the drive current of the electric blower 5 and controlling the output of the electric blower 5, the electric current of the electric blower 5 is large, and the solid lines L1, L2, L2 shown in FIG.
Even when the battery 7 is discharged in a short period of time t1, t2, t3 as shown in FIG. The discharging time of the battery 7 after each charging can be extended to, for example, time t4. In particular, the electric blower 5
The rotation speed of the battery is controlled by the current and the battery
Since the discharge time of 7 is proportional to the product of current and time,
By reducing the current when the current is large, the discharging time of the battery 7 can be lengthened.

Another strong processing based on the current of the electric blower 5 in step 10 will be described with reference to FIG.

The strong processing shown in FIG.
Electric blower 5 or battery 7 due to clogging of trash etc.
This is a process for voltage fluctuations.

First, the current flowing through the electric blower 5 is detected by the resistor R1 as current detecting means (step 31).
It is determined whether I is equal to or greater than the current IA (step 32).
If the detected current I is smaller than the current IA, 1 is added to t to calculate a new t (step 33), and the IC 30 controls the field effect transistor Q1 to control the electric blower 5 at t%. (Step 34) and return. Note that the initial value of t is 90 set in step 1 or step 5.
It is.

On the other hand, if it is determined in step 32 that the detected current I is equal to or larger than the current IA, 1 is subtracted from t to calculate a new t (step 35), and the routine proceeds to step 34.

Further, the strong processing based on the temperature of the battery 7 in step 10 will be described with reference to FIG.

The strong processing shown in FIG. 10 is processing for the case where the temperature of the battery 7 is high immediately after charging, or the case where the temperature of the battery 7 is higher or lower than a predetermined temperature range due to the influence of the ambient temperature. Note that FIG.
In the case of the strong processing indicated by 0, it is unnecessary to set an initial value of t = 90 in steps 1 and 5.

First, the temperature of the battery 7 is detected by the thermistor 37 (step 41), and it is determined whether or not the detected temperature T of the battery 7 is equal to or higher than the temperature T1 (step 42). If it is smaller, the IC 30 controls the electric field effect transistor Q1 to control the electric blower 5 in a preset 95% state (step 43) and returns.

In step 42, the detected temperature T is changed to the temperature T1.
If it is determined that the temperature is equal to or more than the above, the detected temperature T becomes the temperature T
It is determined whether or not the temperature is equal to or higher than 2 (step 44). If the detected temperature T is lower than the temperature T2, the IC 30 controls the field effect transistor Q1 to operate the electric blower 5 in a preset 98% state. (Step 45) and return.

Further, at step 44, the detected temperature T is
If it is determined that the temperature is equal to or higher than 2, it is determined whether or not the detected temperature T is equal to or higher than the temperature T3 (step 46). If the detected temperature T is lower than the temperature T3, the IC 30 is connected to the field effect transistor Q1. To control the electric blower 5 in a preset 100% state (step 47), and return.

Further, if it is determined in step 46 that the detected temperature T is higher than the temperature T3, it is determined whether the detected temperature T is higher than the temperature T4 (step 48). If the temperature is lower than the temperature T4, the IC 30 controls the field effect transistor Q1 to control the electric blower 5 in a preset 95% state (step 49), and returns.

On the other hand, in step 49, the detected temperature T becomes the temperature T4
If it is determined that the above is the case, the IC 30 controls the field effect transistor Q1 to control the electric blower 5 in a preset 90% state (step 50), and returns.

As described above, by detecting the temperature of the battery 7 and controlling the output of the electric blower 5, as shown in FIG. 11, the activation is performed outside the predetermined temperature range, for example, when the temperature of the battery 7 is high. Regardless of whether the discharge capacity is high and the discharge capacity is low, or the temperature of the battery 7 is low and the activation is low and the discharge capacity is low, the discharge amount per unit time can be reduced by driving the electric blower 5 low. And the discharge time of the battery 7 per charge can be increased.

Further, the strong processing based on the motor rank of the electric blower 5 in step 10 will be described with reference to FIG.

The strong processing shown in FIG. 12 is processing corresponding to the motor rank set by the setting means 38 in advance. In the case of the strong processing shown in FIG. 12, it is not necessary to set an initial value of t = 90 in steps 1 and 5.

First, the input terminals R5 and R6 of the setting means 38 are read (step 51), and it is determined whether or not the input terminal R5 is at an H level (step 52). It is determined whether the input terminal R6 is at the H level (step 53). If it is determined that the input terminal R6 is not at the H level, the motor rank of the electric blower 5 is Since it is A, the IC 30 controls the field effect transistor Q1 to control the electric blower 5 in a preset 100% state (step 54), and returns.

If it is determined in step 53 that the input terminal R5 and R6 are L and H, the motor rank of the electric blower 5 is B, and the IC 30 controls the field effect transistor Q1. Then, the electric blower 5 is controlled in a preset 98% state (step 55), and the routine returns.

Further, if it is determined in step 52 that the input terminal R6 is at the H level, it is determined whether or not the input terminal R6 is at the H level (step 56). Since R5 and R6 are H and L, and the motor rank of the electric blower 5 is C, the IC 30 controls the field effect transistor Q1 to control the electric blower 5 in a preset 95% state (step S1). 57), return.

Further, if it is determined in step 56 that the input terminal R5 and R6 are at H level and H level, the motor rank of the electric blower 5 is D. Therefore, the IC 30 switches the field effect transistor Q1 to H level. By controlling, the electric blower 5 is controlled in a preset 90% state (step 58), and the process returns.

As described above, by checking and setting the motor rank of the electric blower 5 in advance and controlling the output of the electric blower 5, the electric current of the electric blower 5 is increased more than necessary, and the battery 7 is discharged in a short time. In such a case, the electric blower 5 is driven low in accordance with the motor rank of the electric blower 5, so that the discharging time of the battery 7 per charge can be lengthened. The discharge time of the battery 7 of the electric blower 5 can be constant regardless of the motor rank of the electric blower 5.

Although the strong processing has been described in any case, the shaking processing may be performed by the weak processing.

In the above embodiment, the canister type is described, but the present invention can be applied to an upright type or a handy type.

Further, the surface-to-be-cleaned detecting means may detect the grounding of the suction port 25 by detecting the movement of the suction port 25.

Further, in the above-described embodiment, the output of the electric blower 5 is reduced when the motor 27 is stopped in a predetermined case. However, the output of the electric blower 5 may be stopped instead of simply decreasing. The same effect can be basically obtained by lowering the driving power than the high power.

In addition, for example, the remaining amount of the battery capacity of the battery 7 is detected and the remaining amount is displayed according to the remaining amount, or the state set by the manual operation means 16, that is, the driving state of the electric blower 5 is displayed. You may do so.

[0089]

According to the first aspect of the present invention, the voltage of the battery is detected by the voltage detecting means. If the voltage of the battery detected by the voltage detecting means is equal to or more than a predetermined value, the voltage is detected. By controlling the switching element to reduce the average on-duty as compared with the case where the voltage is smaller than a predetermined value, the voltage detection means is generally simple in configuration, and the power supplied from the battery without large loss. By lowering the unnecessarily high voltage, the discharge time of the battery can be prolonged with the output of the electric blower being appropriate.

According to the second aspect of the present invention, the electric current of the electric blower is detected by the electric current detecting means, and the control means judges whether the electric current of the electric blower detected by the electric current detecting means is equal to or more than a predetermined value. By controlling the switching element to reduce the average on-duty as compared to the case where the value is smaller than the predetermined value, the current of the electric blower is reduced without causing a large loss, and by reducing the current more than necessary, Since the discharge time of a battery is determined substantially by the product of the current and the time, the discharge time of the battery can be lengthened when the output of the electric blower is appropriate.

According to the third aspect of the present invention, the temperature of the battery is detected by the temperature detecting means, and the control means sets the temperature within the predetermined range when the temperature of the battery detected by the temperature detecting means is out of the predetermined range. By controlling the switching element to reduce the average on-duty compared to the case of, the amount of discharge from the battery is reduced without a large loss, and the battery is discharged when the output of the electric blower is appropriate. You can extend the time.

According to the fourth aspect of the present invention, the control state stored in the storage means corresponding to the performance of the electric blower used by the setting means is set, and the control means sets the control state set by the setting means. Since the switching element is controlled according to the state, the amount of discharge from the battery can be controlled without large loss, and the battery can be driven in an appropriate state corresponding to the electric blower to be used, so that the battery discharge time can be extended.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an operation of a strong process including a process for a change in battery voltage according to an embodiment of the electric vacuum cleaner of the present invention.

FIG. 2 is a perspective view showing an external appearance of the electric vacuum cleaner.

FIG. 3 is a circuit diagram showing a circuit configuration of the electric vacuum cleaner.

FIG. 4 is a graph showing a distribution of motor ranks of the electric blower.

FIG. 5 is a flowchart showing the operation of the overall process of the embodiment.

FIG. 6 is a graph showing a relationship between a battery voltage and a discharge time.

FIG. 7 is a flowchart showing an operation of a strong process including a process for a change in current of the electric blower, including a process for the current of the electric blower.

FIG. 8 is a graph showing a relationship between a drive current of the electric blower and a battery discharge time.

FIG. 9 is a flowchart showing an operation of a strong process including a process for a current fluctuation of the electric blower, including a process for the current of the electric blower.

FIG. 10 is a flowchart showing an operation of a strong process including a process for a change in current of the electric blower including a process for the temperature of the battery.

FIG. 11 is a graph showing the relationship between battery temperature and discharge time.

FIG. 12 is a flowchart showing an operation of a strong process including a process of a motor rank of the electric blower.

[Explanation of symbols]

 5 Electric blower 7 Battery as battery 30 IC as control means 37 Thermistor as temperature detecting means 38 Setting means 39 Voltage detecting means Q1 Field effect transistor as switching element

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02J 7/00 302 H02J 7/00 302D

Claims (4)

[Claims] An electric blower supplied with electric power from a battery; a voltage detecting means for detecting a voltage of the battery; a switching element for controlling electric power supplied from the battery to the electric blower; Control means for controlling the switching element to reduce the average on-duty when the voltage of the battery detected in step (b) is equal to or higher than a predetermined value, as compared with a case where the voltage is lower than the predetermined value. Vacuum cleaner. 2. An electric blower to which electric power is supplied by a battery; current detecting means for detecting a current of the electric blower; a switching element for controlling electric power to be supplied from the battery to the electric blower; Control means for controlling the switching element to reduce the average on-duty when the current of the electric blower detected by the means is equal to or greater than a predetermined value, as compared to a case where the current is smaller than the predetermined value. Vacuum cleaner featuring. An electric blower supplied with electric power from a battery; a temperature detecting means for detecting a temperature of the battery; a switching element for controlling electric power supplied from the battery to the electric blower; Control means for controlling the switching element to reduce the average on-duty when the temperature of the battery detected at the time is outside the predetermined range as compared with the case where the temperature is outside the predetermined range. Vacuum cleaner. 4. An electric blower supplied with electric power from a battery, a switching element for controlling electric power supplied from the battery to the electric blower, and a storage means for storing a control state corresponding to the performance of the electric blower. Setting means for setting the control state stored in the storage means corresponding to the performance of the electric blower to be used; and control means for controlling the switching element according to the control state set by the setting means. Vacuum cleaner characterized by being.