JPH08280588A - Electric vacuum cleaner and electric blower power consumption control method - Google Patents

Abstract

(57) [Summary] [Object] To provide a vacuum cleaner and a power consumption control method for an electric blower that control the power consumption of the electric blower without being affected by fluctuations in the power supply voltage. A control circuit section 6 for controlling the power consumption of an electric blower 7 has a voltage detection circuit 17 for detecting a power supply voltage to be fed.
A current detection circuit 18 for detecting a current flowing through the electric blower 7, a power consumption calculated by the detected voltage value and a current value, and a preset target power consumption value of the electric blower 7. The control means is configured to compare the differences and control the power consumption so as to approach the target power consumption value. [Effect] By controlling the power consumption of the electric blower,
It is possible to obtain an economical vacuum cleaner that does not use unnecessary power and that is highly economical.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vacuum cleaner which detects a power supply voltage supplied from a commercial power source and a current flowing through an electric blower in an electric vacuum cleaner, and controls power consumption of the electric blower based on the detected values. The present invention relates to a power consumption control method for an electric blower.

[0002]

2. Description of the Related Art Conventionally, in this type of vacuum cleaner,
The constant that controls the power consumption of the electric blower built into the electric vacuum cleaner body is calculated by using the value or function that was obtained in advance, which was determined when the power supply voltage was in a certain state. .

Further, as described in Japanese Patent Laid-Open No. 5-95877, there is a method of detecting the current flowing through the electric blower and controlling the phase of the electric blower so that the electric current becomes the same as the current value set by the hand operation unit. Proposed.

[0004]

However, the conventional technique described in Japanese Patent Laid-Open No. 5-95877 does not consider the fluctuation of the power supply voltage supplied from the commercial power supply. When the power supply voltage fluctuates beyond a certain state, the power consumption of the electric blower built into the vacuum cleaner body also fluctuates. That is, when the power supply voltage becomes higher than the power supply voltage that is assumed in advance, the electric blower consumes electric power more than the set value, which causes a problem that the rectifying brush of the electric blower is worn out and the life is shortened.

Furthermore, in terms of usability, the suction force sticks to the floor surface due to an undesired suction force, resulting in a lack of smooth operational feeling and noise. In addition, when the power supply voltage becomes lower than the assumed power supply voltage, the electric blower consumes less power than the set value, and the suction force becomes weak.

An object of the present invention is to provide a vacuum cleaner and a method for controlling power consumption of an electric blower, which controls the power consumption of the electric blower without being affected by fluctuations in the power supply voltage.

[0007]

In order to achieve the above object, the present invention relates to an electric vacuum cleaner having a control circuit section which has a built-in electric blower and controls power consumption of the electric blower. Is a voltage detection circuit for detecting a power supply voltage to be supplied, a current detection circuit for detecting a current flowing in the electric blower, and a power consumption calculated in advance based on the detected voltage value and current value and It is characterized by further comprising control means for comparing the difference with the set target power consumption value of the electric blower and controlling the power consumption so as to approach the target power consumption value.

Another feature of the present invention is a power consumption control method for an electric blower for controlling the power consumption of an electric blower built in an electric vacuum cleaner, wherein a power supply voltage supplied to the electric vacuum cleaner is detected. Along with detecting the current flowing in the electric blower, comparing the difference between the power consumption obtained by calculating based on the detected voltage value and the current value and the preset target power consumption value of the electric blower, It is to control the power consumption to approach the target power consumption value.

[0009]

According to the present invention, the voltage detection circuit of the control circuit section detects the power supply voltage supplied to the vacuum cleaner, and the current detection circuit detects the current flowing through the electric blower. The control means compares the difference between the power consumption obtained by calculating based on the detected voltage value and current value and the preset target power consumption value of the electric blower, and by changing the energization time, etc. , Controlling the power consumption to approach the target power consumption value.

As a result, the power consumption of the electric blower can always be brought close to the target set value without being affected by fluctuations in the power supply voltage, so that the economical efficiency and efficiency of the electric vacuum cleaner can be improved. it can.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A power consumption control method for an electric vacuum cleaner and an electric blower according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows the overall construction of the vacuum cleaner. 1 is a vacuum cleaner body, 2 is a hose, 3 is a hand operation part, 4 is an extension pipe, 5 is a suction port, and the control circuit part 6 of FIG. It incorporates a directional semiconductor element 8.

FIG. 1 shows the configuration of a control circuit of an electric vacuum cleaner according to an embodiment of the present invention. This circuit includes a control circuit unit 6, an electric blower 7, a bidirectional semiconductor element 8 for turning on / off the electric power supply to the electric blower 7, a commercial power supply 16, and a hand circuit 19.

The control circuit unit 6 is stable because it mainly controls the power consumption of the electric blower 7, for example, a microcomputer (hereinafter abbreviated as microcomputer) 15 and the entire control circuit unit 6 is driven. A power supply circuit 9 for generating a DC voltage, a reset circuit 10 for generating a signal for initializing the microcomputer 15 when the power is turned on, and a commercial power supply frequency detection circuit 11 for detecting the basic timing of power consumption control of the electric blower 7. , A load drive circuit 12 for controlling the bidirectional semiconductor element 8, a display circuit 13 for displaying the power consumption state of the electric blower 7, an oscillation circuit 14 serving as a basic frequency of the microcomputer 15, and a power supply voltage supplied from a commercial power supply. And a current detection circuit 18 for detecting a current flowing through the electric blower 7.

The hand operation unit 3 of FIG. 2 is the hand circuit 1 of FIG.
9 is built in, and the user operates the switch provided on this hand circuit 19 to drive the electric blower 7
It is possible to set the on / off state and the target set value, that is, the target power consumption value.

Further, as shown in FIG. 3, an automatic operation switch 20, a strong operation switch 21, a static operation switch 22, and a stop switch 23 for setting a target power consumption value of the electric blower 7 are provided on the hand operation unit 3. Each is provided.

When the user inputs any one of the automatic operation switch 20, the strong operation switch 21 and the static operation switch 22 shown in FIG. 3 at the start of operation, the electric blower 7 of FIG. 1 starts operation. However, in the present embodiment, control of power consumption when the strong operation switch 21 is input will be described.

The power consumption of the electric blower 7 is controlled by controlling the voltage applied to the electric blower 7 at the timing of the trigger pulse applied to the bidirectional semiconductor element 8 for controlling the energization of the electric blower 7. . At the start of operation,
According to the power supply voltage detected by the voltage detection circuit 17, FIG.
A trigger pulse is output according to a preset phase time such as.

At this time, the voltage applied to the electric blower 7 changes depending on the timing of the trigger pulse. Therefore, the current also changes and the power consumption can be changed. A changed voltage such as the voltage waveform of the electric blower terminal voltage shown in FIG. 5 is applied to the electric blower 7, and the current detection circuit 18 detects the current flowing through the electric blower 7.

Here, the voltage value and the current value detected by the voltage detection circuit 17 and the current detection circuit 18 are input to the microcomputer 15 to perform calculation, and the power consumption of the electric blower 7 at that time is calculated, and the calculated power consumption is calculated. Compares and determines whether there is a difference with the target power consumption value set at the start of operation.

Next, when the power consumption calculated and calculated based on the comparison judgment is smaller than the target power consumption value of the operation mode set at the start of the operation, the trigger pulse is set to the side a as shown in FIG. By increasing the voltage applied to the electric blower 7 earlier by increasing the energization time to the electric blower 7 as a result, the power consumption of the electric blower 7 is increased and the target consumption is increased. Bring it closer to the power value. On the contrary, when the target power consumption value in the operation mode set at the start of the operation is larger than the target power consumption value, the trigger pulse is shifted to the b side by a constant amount to delay the rise of the voltage applied to the electric blower 7, The energization time to the electric blower 7 is shortened, and as a result, the power consumption of the electric blower 7 is reduced,
Bring it closer to the target power consumption value.

As described above, as shown in FIG. 7, as a result of FIGS. 5 and 6, the equation of power consumption W = power supply voltage V × current consumption A is used,
From the relationship between the power supply voltage V and the consumed current A, W = 110 × Ib = 100 × I = 90 × Ia is derived. That is, the power consumption of the electric blower 7 can be controlled so as to always approach the target power consumption value even if the power supply voltage changes.

FIG. 8 is a flow chart showing the operation for making the power consumption of the electric blower 7 close to the target power consumption value of the operation mode set at the start of operation as described above.
become that way.

FIG. 9 shows the relationship between the air flow rate Q, the power consumption W, the static pressure H, and the suction power P. The dotted line shows the case where the electric blower 7 is driven without performing the power consumption control of the present embodiment, and the power consumption is large on the large air volume side and small on the small air volume side.

Here, the relationship between the state of the electric vacuum cleaner (the degree of dust accumulation in the dust collecting chamber) and the air flow rate when the power consumption control of this embodiment is not performed will be described with reference to the following schematic diagram.

In FIGS. 10A and 10B, 30 is a dust collecting chamber, 28 is a filter, 29 is dust, 7 is an electric blower,
27 is a fan. Reference numerals 31a and 31b represent the flow of air. In FIG. 10A, the dust 29 inside the dust collection chamber 30 is not accumulated, so that there are few obstacles to the flow of air. That is, the resistance generated when air flows (hereinafter,
Since the ventilation resistance (abbreviated as abbreviated) is small, a relatively large air flow such as 31a is possible. Therefore, the air volume becomes large. Especially, in the initial open state where dust is not yet absorbed, the air volume becomes maximum.

A fan 27 is connected to the electric blower 7 and is rotated to generate a flow of air. However, since air is a load for the electric blower 7,
It means that the larger the air volume, the greater the load. (When the air volume is large, the power consumption becomes large.) On the contrary, in FIG. 10B, the ventilation resistance becomes large due to the large amount of dust 29 inside the dust collection chamber 30, and the air flow is similar to 31b. Get smaller. Therefore, the air volume is small. Further, for the electric blower 7, the load is also small because the air volume is small. (When the air volume is small, the power consumption is small.) Also, FIG. 11 and FIG. 12 show the relationship between the cleaning surface and the air volume when the power consumption control is not performed.

FIG. 11 is a view of the suction tool as viewed from the cleaning surface. 32 is an outer frame of the suction tool, 33 is a roller, and 34 is a rubber blade. 12A and 12B show the positional relationship between the cleaning surface and the suction tool when the suction tool is operated on a wooden floor, tatami mat, and rug, taken along the line AA. 32 is a suction tool outer frame, 34 is a rubber blade, 35 in FIG. 12 (a) is a wooden floor (or tatami), and FIG. 12 (b) is
36 in is full. Also 37
a and b represent the flow of air.

In FIG. 12 (a), the roller 33 causes the suction tool to float from the wooden floor 35, and the rubber blade 34
And a gap is formed between the wooden floors 35. Therefore, the ventilation resistance is small, and a relatively large air flow like 37a is possible. That is, the air volume becomes large.

In FIG. 12B, although the suction tool is made to float from the cleaning surface by the roller 33, the carpet 3
6, the gap with the rubber blade 34 is small and the ventilation resistance is large, so that the air flow is relatively small like 37b. That is, the air volume is small.

As described above, when the electric blower 7 is driven without performing the power consumption control of this embodiment, when dust is not much accumulated in the dust collection chamber 30, the cleaning surface is a wooden floor or tatami mat. , Or when the suction tool is lifted in the air, that is, when strong suction force is not required, the power consumption increases,
Conversely, when dust collects inside the dust collection chamber 30 (when it is clogged), when the cleaning surface is a carpet, that is, in FIG.
When a strong suction force is required in the vicinity of the peak point of the suction work rate, the power consumption becomes small.

Therefore, by performing the power consumption control of the present embodiment, as shown by the solid line of the power consumption W in FIG. 9, the power consumption more than necessary is restricted on the large air volume side and the power consumption is increased on the small air volume side. It is possible to increase the suction force and control so as to always approach the target power consumption value.

[0033]

According to the present invention, the power consumption of the electric blower can be controlled so as to approach the target value, that is, the target power consumption value, regardless of the fluctuation of the voltage of the commercial power source. Therefore, it is possible to obtain an electric vacuum cleaner that does not use unnecessary electric power, is highly economical, and is efficient.

[Brief description of drawings]

FIG. 1 is a block diagram showing a control circuit configuration of an electric vacuum cleaner according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of an entire electric vacuum cleaner.

FIG. 3 is a diagram showing a hand operation unit of the electric vacuum cleaner.

FIG. 4 is a diagram showing the phase control value of each operation mode with respect to the power supply voltage of the vacuum cleaner according to the embodiment of the present invention.

FIG. 5 is a diagram showing a trigger pulse waveform and an electric blower terminal voltage waveform with respect to a commercial power supply waveform.

FIG. 6 is a diagram showing an electric blower terminal voltage waveform with respect to the trigger pulse waveform of FIG.

FIG. 7 is a diagram showing a relationship between power supply voltage and current consumption of the vacuum cleaner according to the embodiment of the present invention.

8 is a flow chart of power consumption control of the electric vacuum cleaner of FIG.

FIG. 9 is a diagram showing the relationship between the air volume, power consumption, static pressure, and suction power of the vacuum cleaner according to the embodiment of the present invention.

FIG. 10 is a diagram showing the relationship between the amount of dust collected in the dust collecting chamber of the vacuum cleaner and the air volume.

FIG. 11 is a view of the suction tool of the electric vacuum cleaner as viewed from the cleaning surface.

12 is a cross-sectional view of the suction tool of FIG. 11, showing the relationship between the cleaning surface and the air volume.

[Explanation of symbols]

6 control circuit section, 7 electric blower, 8 bidirectional semiconductor element,
9 power supply circuit, 10 reset circuit, 11 commercial power supply frequency detection circuit, 12 load drive circuit, 13 display circuit, 14 oscillator circuit, 15 micro computer, 16 commercial power supply, 17 voltage detection circuit, 18 current detection circuit, 19 hand circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuhisa Kawamata 1-1-1 Higashitaga-cho, Hitachi-shi, Ibaraki Electric Company, Hitachi Ltd.

Claims (10)

[Claims] 1. An electric vacuum cleaner having a control circuit unit that has a built-in electric blower and controls the power consumption of the electric blower, wherein the control circuit unit includes a voltage detection circuit that detects a power supply voltage to be supplied, A current detection circuit that detects a current flowing through the electric blower, and compares the difference between the power consumption calculated based on the detected voltage value and current value and a preset target power consumption value of the electric blower. However, the electric vacuum cleaner is provided with a control unit that controls the power consumption to approach the target power consumption value. 2. The control means according to claim 1, wherein the control means controls the energization time to the electric blower based on the result of the comparison to bring the power consumption closer to the target power consumption value. And vacuum cleaner. 3. The energization time according to claim 1 or 2, wherein the energization time changes a voltage applied to the electric blower according to an output timing of a trigger pulse applied to a bidirectional semiconductor element that controls energization to the electric blower. The vacuum cleaner is characterized in that it is controlled. 4. The trigger pulse according to any one of claims 1 to 3, when the operation of the electric blower is started, the trigger pulse is output according to a preset phase time according to the detected power supply voltage. An electric vacuum cleaner characterized in that. 5. The control means according to claim 1, wherein the control means sets the power consumption to the target power consumption value in the vicinity of a peak point of the suction work rate of the electric blower or in an initial open state where no dust is picked up. An electric vacuum cleaner characterized by being controlled to approach. 6. A power consumption control method for an electric blower for controlling the power consumption of an electric blower built in an electric vacuum cleaner, comprising: detecting a power supply voltage supplied to the electric vacuum cleaner and detecting a current flowing through the electric blower. Detecting, comparing the difference between the power consumption obtained by calculating based on the detected voltage value and current value and the preset target power consumption value of the electric blower, the power consumption is the target power consumption A method for controlling power consumption of an electric blower, characterized by controlling so as to approach a value. 7. The electric blower according to claim 6, wherein the power consumption is made closer to the target power consumption value by controlling the energization time to the electric blower based on the result of the comparison. Power consumption control method. 8. The voltage applied to the electric blower according to claim 6 or 7, wherein the energization time is changed according to the output timing of a trigger pulse applied to the bidirectional semiconductor element for controlling the energization of the electric blower. A method for controlling power consumption of an electric blower, which is characterized in that the method described above is performed. 9. The trigger pulse according to claim 6, wherein the trigger pulse is output at a phase time preset according to the detected power supply voltage at the start of operation of the electric blower. A method for controlling power consumption of an electric blower, the method comprising: 10. The power consumption control according to claim 6, wherein the power consumption is controlled to approach the target power consumption value in the vicinity of the peak point of the suction work rate or in the initial open state in which no dust is picked up. Control method of electric power consumption of electric blower.