JP2001070213A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum cleaner capable of controlling an electric blower by reducing the number of parts. SOLUTION: This vacuum cleaner comprises a voltage doubler rectifying circuit 30 converting an input AC power voltage V1 into a DC voltage V2 and outputting the converted voltage and the electric blower 22 driven on the DC voltage V2. The cleaner further comprises a voltage detecting circuit 31 detecting the DC voltage V2 and a control device 32 controlling the electric blower 22 on a detected voltage V3 based on the voltage value of the DC voltage V2 detected by the voltage detecting circuit 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner having control means for controlling an electric blower driven by a DC voltage.

[0002]

2. Description of the Related Art Conventionally, there is known a vacuum cleaner having a voltage doubler rectifier circuit for converting an AC power supply voltage into a DC voltage, and an electric blower driven by the DC voltage converted by the doubler voltage rectifier circuit. ing.

In such a vacuum cleaner, the driving force of the electric blower fluctuates due to the fluctuation of the AC power supply voltage.
It is necessary to provide a voltage detection circuit for detecting the C power supply voltage and a control device for controlling the electric blower based on the voltage detected by the voltage detection circuit.

[0004]

Since the control device uses a CPU or the like, the detection voltage detected and output by the voltage detection circuit must be a DC voltage. For this reason,
The voltage detection circuit must be configured to output a DC voltage corresponding to an AC voltage that is an AC power supply voltage. For this reason, there has been a problem that the number of parts increases and the cost increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vacuum cleaner capable of controlling an electric blower with a reduced number of parts.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, an input AC power supply voltage is changed to a DC power supply voltage.
A vacuum cleaner comprising: a voltage converter for converting the voltage to a voltage; and an electric blower driven by the DC voltage, wherein the voltage detector detects the DC voltage, and the voltage detector detects the voltage. Control means for controlling the electric blower with a detection voltage based on a DC voltage value.

According to a second aspect of the present invention, when the detected voltage is equal to or higher than a preset voltage when the electric blower is stopped, the control means inputs an operation command signal for operating the electric blower. In this case, the electric blower is not driven.

According to a third aspect of the present invention, when the detected voltage is equal to or higher than a preset voltage while the electric blower is being driven, the control means stops the operation of the electric blower or The input of the electric blower is reduced.

According to a fourth aspect of the present invention, the control means sets the electric blower in a drivable state when the detected voltage is lower than a set voltage.

According to a fifth aspect of the present invention, the control means returns the electric blower to a normal operation when the detected voltage becomes lower than a set voltage after stopping the operation of the electric blower or reducing the input of the electric blower. It is characterized by the following.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vacuum cleaner according to the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 20 denotes a vacuum cleaner main body, and a dust collecting chamber (not shown) is provided in the main body 20.
And an electric chamber (not shown) behind the dust collection chamber. A dust collection filter is provided in the dust collection chamber, and an electric blower 22 for setting the dust collection chamber to a negative pressure is provided in the electric chamber.

One end of a hose 23 is detachably connected to a connection port (not shown) of the main body 20, and a hand operation unit 24 is provided at the other end of the hose 23. An operation switch 25 for turning off the power is provided on an operation panel 25 of the operation unit 24 at hand.
And a weak setting switch S2 for setting the power supplied to the electric blower 22 to a low level and a strong setting switch S3 for setting the power supplied to the electric blower 22 to a high level. 2
Reference numeral 6 denotes an extension tube detachably connected to the hand operation unit 24, 2
Reference numeral 7 denotes a suction port body detachably connected to the distal end of the extension tube 26.

FIG. 2 is a circuit diagram showing a configuration of a control system of the vacuum cleaner.

In FIG. 2, reference numeral 30 denotes a voltage doubler rectification circuit (voltage conversion means) for converting an AC voltage (AC power supply voltage) V1 to a double DC voltage V2.
It is composed of two diodes D1 to D4 and two capacitors C1 and C2 connected in series. The DC voltage V2 output from the voltage doubler rectifier circuit 30 is converted into a three-phase AC by a plurality of IGBTs (not shown), and the electric blower 22 is driven by the three-phase AC.

Reference numeral 31 denotes a voltage detection circuit (voltage detection means) for detecting the DC voltage V2 output from the voltage doubler rectification circuit 30.
The voltage detection circuit 31 is composed of two resistors R1 and R2 connected in series between the capacitors C1 and C2. In this embodiment, the resistance R1 is, for example, about 820 KΩ.
And the resistance R2 is about 10 KΩ.

The voltage detecting circuit 31 includes a voltage doubler rectifying circuit 30.
And outputs a detection voltage V3 obtained by dividing the DC voltage V2 output from the circuit by resistors R1 and R2, and the configuration is very simple.

Reference numeral 32 denotes a control device (control means) including a CPU and the like. The control device 32 includes setting switches S2, S
The IGBT is controlled so that the electric blower 22 is driven with the strength set by 3 or the IGBT is controlled based on the detection voltage V3 output from the voltage detection circuit 31 to control the drive of the electric blower 22.

Next, the operation of the vacuum cleaner constructed as described above will be described with reference to the flowchart of FIG.

When "strong" or "weak" is set by operating the strong / weak setting switches S2 and S3, it is determined in step 1 whether the detected voltage V3 is equal to or higher than the set voltage (3.760 volts). If yes, go to step 2. In step 2, a normal control operation is performed. That is, when the detection voltage V3 is smaller than the set voltage, the control device 32
The electric blower 22 with the set “strong” or “weak” strength
The IGBT is controlled so that is driven. Then, the process returns to step 1.

When the detection voltage V3 is smaller than the set voltage, that is, as shown in the table of FIG.
Is less than or equal to 110 volts, the operations of step 1 and step 2 are repeatedly performed, and the electric blower 22 continues to be driven at the set “strong” or “weak” strength.

If the determination in step 1 is yes, the process proceeds to step 3. In step 3, it is determined whether or not the electric blower 22 is being driven. In step 5, the electric blower 22 is not driven even if the setting switches S2 and S3 are operated. This prevents the electric blower 22 from inputting electric power equal to or higher than the rated value.

If the determination in step 3 is yes, the process proceeds to step 4. In step 4, the detection voltage V3 is 3.760
When the voltage is equal to or more than volts and equal to or less than 3.900 volts, the power input to the electric blower 22 is reduced. That is,
When the AC power supply voltage V1 is larger than 110 volts and smaller than 120 volts, the input power of the electric blower 22 is reduced. As a result, unnecessary electric power is supplied to the electric blower 22.
Is prevented from being input.

When the detected voltage V3 is higher than 3.900 volts, the driving of the electric blower 22 is stopped. This is because when the AC power supply voltage V1 is 120 volts or more, the rated value of the electric blower 22 may be exceeded. In addition, in case of accidental connection to an AC 200 volt outlet, the electric blower 22
Is to prevent driving.

Then, after step 4, the process returns to step 1.

After the drive of the electric blower 22 is stopped or the input is reduced, if it is determined in step 1 that the detected voltage V3 is lower than the set voltage (3.760 volts), the process proceeds to step 2, and the electric blower is again operated. 22 is set "strong"
Or, it is driven with a "weak" strength. Therefore, there is no need to operate the strong / weak setting switches S2 and S3 again.

When the electric blower 22 is not driven, that is, when the high / low setting switches S2 and S3 are not operated, in step 1, the detection voltage V3 is higher than the set voltage (3.760 volts). It is determined whether or not the processing is NO. Here, since the strong / weak setting switches S2 and S3 are not operated, the electric blower 22 is not driven in step 2, but the electric blower 22 is driven to be driven by operating the strong / weak setting switches S2 and S3. It is possible. Therefore, the detection voltage V
If 3 is less than the set voltage, the electric blower 22 is driven at any time by operating the strong and weak setting switches S2 and S3.

According to this embodiment, the DC voltage V2 for driving the electric blower 22 is detected by the voltage detection circuit 31, and the AC power is supplied based on the detection voltage V3 corresponding to the DC voltage V2 detected by the voltage detection circuit 31. Find the voltage V1 and calculate this AC
Since the electric blower 22 is controlled according to the power supply voltage V1, the voltage detection circuit 31 can detect the voltage using the DC voltage V2 as it is by a voltage dividing circuit composed of two resistors R1 and R2. Therefore, the circuit configuration of the voltage detection circuit 31 is extremely simple, and the voltage detection circuit 31
And the number of parts can be reduced, and an accurate AC power supply voltage V1 can be obtained at low cost.

[0029]

As described above, according to the first aspect of the present invention, there are provided a voltage conversion means for converting an input AC power supply voltage into a DC voltage and outputting the same, and an electric blower driven by the DC voltage. A vacuum cleaner comprising:
A voltage detecting means for detecting the voltage; and a control means for controlling the electric blower with a detection voltage based on the voltage value of the DC voltage detected by the voltage detecting means. Can be directly detected by the voltage dividing circuit, so that the configuration of the voltage detecting means can be simplified and simplified. Therefore, the number of parts of the voltage detecting means can be reduced, and An accurate AC power supply voltage can be obtained at a low cost.

According to the second aspect of the present invention, if the detected voltage becomes equal to or higher than a preset voltage when the electric blower is stopped, the control means inputs an operation command signal for operating the electric blower. Also, since the electric blower is not driven, it is possible to prevent electric power exceeding the rated value from being input to the electric blower.

According to the third aspect of the present invention, when the detected voltage becomes equal to or higher than a preset voltage while the electric blower is being driven, the control means stops the operation of the electric blower or Since the input of the electric blower is reduced, it is possible to prevent an unnecessary amount of electric power from being input to the electric blower.

According to the fourth aspect of the present invention, the control means sets the drivable state of the electric blower when the detected voltage is lower than the set voltage. Is always driven.

According to the fifth aspect of the present invention, when the detected voltage becomes less than the set voltage after stopping the operation of the electric blower or reducing the input of the electric blower, the control means switches the electric blower to a normal operation. Since it is a return, there is no need to perform the setting operation again.

[Brief description of the drawings]

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

FIG. 2 is a circuit diagram showing a configuration of a control system of the electric vacuum cleaner in FIG.

FIG. 3 is a flowchart of the control device shown in FIG. 2;

FIG. 4 is a table showing a relationship between a detection voltage, an AC power supply voltage, and processing.

[Explanation of symbols]

 22 electric blower 30 times voltage rectifier circuit 31 voltage detection circuit 32 controller

Claims (5)

[Claims] 1. A vacuum cleaner comprising: a voltage converter for converting an input AC power supply voltage into a DC voltage and outputting the DC voltage; and an electric blower driven by the DC voltage, wherein the DC voltage is detected. And a control means for controlling the electric blower with a detection voltage based on a DC voltage value detected by the voltage detection means. 2. When the detected voltage is equal to or higher than a preset voltage when the electric blower is stopped, the control means controls the electric blower even if an operation command signal for operating the electric blower is input. The vacuum cleaner according to claim 1, wherein the vacuum cleaner is not driven. 3. When the detected voltage is equal to or higher than a preset voltage while the electric blower is being driven, the control means stops the operation of the electric blower or stops the input of the electric blower. The vacuum cleaner according to claim 1, wherein the amount is reduced. 4. The electric vacuum cleaner according to claim 2, wherein said control means sets the electric blower in a drivable state when said detected voltage is lower than a set voltage. 5. The method according to claim 1, wherein the control means returns the electric blower to a normal operation when the detected voltage becomes lower than a set voltage after stopping the operation of the electric blower or reducing the input of the electric blower. The vacuum cleaner according to claim 3.