JPH10201687A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely control the input to a main body motor by means of a simple circuit configuration using discrete parts, without using such an expensive component as a microcomputer, to unitize the control of power to the vacuum cleaner using a selecting switch and control for correcting the power decreased by dust clogging the cleaner, and to perform both of the controlling operations using the simple circuit configuration. SOLUTION: A vacuum cleaner has a motor-driven blower, an input setting part 4 setting the power supplied to the motor-driven blower, a current detecting part 5 measuring a current driving the motor-driven blower, and an input control part 7 controlling the power supplied to the motor-driven blower, the input control part performing phase control based on a phase ignition angle which is output from a comparator circuit part 6 comparing the DC level of either the input setting part or the current detecting part with a sawtoothed reference wave.

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 controlling electric power supplied to an electric blower using a phase control method. More specifically, the present invention relates to a vacuum cleaner provided with a control circuit for correcting power when power is reduced due to clogging of dust or the like.

[0002]

2. Description of the Related Art A vacuum cleaner is provided with a manual suction force adjustment switch for adjusting the suction force of a carpet, a floor, a tatami mat, or the like. When the power supplied to the motor is controlled or the output drops due to dust clogging, the current of the main body motor is detected, or the pressure sensor detects the amount of dust clogging to increase the output. I have.

For example, as disclosed in Japanese Patent Application Laid-Open No. Hei 6-113968, by detecting the amount of dust clogging in a main body by a pressure sensor or the like, an arithmetic processing unit such as a microcomputer and a memory unit are used to control the motor of the main body according to the amount of dust clogging. For controlling the supply power of the power supply.

[0004]

However, the use of such a microcomputer has a problem that it is expensive. Therefore, the present inventor has filed Japanese Patent Application No. 7-1642.
As disclosed in Japanese Patent No. 93, an input control circuit having a circuit configuration for determining a phase point arc using a CR time constant using a discrete circuit is proposed. This control circuit uses the signal obtained by the current detection circuit to calculate R
Is controlled by changing the time constant of.

In the case of this structure, it is necessary to perform a reconversion into a resistance component or the like so as to affect the R time constant, and therefore, a photoelectric device such as a photocoupler must be used. Further, there is a problem that the control by the adjustment switch of the suction force according to the purpose of use and the control for correcting the reduction in power due to the clogging of the dust are unified and cannot be easily controlled.

The present invention has been made in order to solve such a problem, and the input control of the main body motor can be reliably performed by using a simple circuit configuration using discrete components without using expensive components such as a microcomputer. It is an object of the present invention to provide a vacuum cleaner which can be performed in a vacuum cleaner.

Another object of the present invention is to unify the control of the power of a vacuum cleaner by a power selection switch and the control of compensating for a decrease in power due to clogging of dust, and to perform both controls with a simple circuit configuration. An object of the present invention is to provide a vacuum cleaner capable of performing the above.

[0008]

According to the present invention, there is provided an electric vacuum cleaner, comprising: an electric blower; an input setting section for setting the intensity of electric power supplied to the electric blower; and a current detector for measuring a current for driving the electric blower. And an input control unit for controlling power supplied to the electric blower, wherein the input control unit compares a DC level of the input setting unit or the current detection unit with a sawtooth reference wave. The phase is controlled by the arc angle of the phase point output from. With this configuration, the difference between the DC level change due to the volume that changes according to the selection of the input setting unit or the change in the DC level based on the change in the current detected by the current detection unit and the sawtooth-like reference wave is obtained. Based on the output signal, the phase angle at which the AC power supply is turned on can be controlled, and the power supplied can be controlled with only a simple circuit configuration.

A first comparator for comparing the DC level of the input setting section with the sawtooth reference wave, and a second comparator for comparing the DC level of the current detection section with the sawtooth reference wave. The input control section controls the power supplied by the output having the larger phase point arc of the output of the respective comparators of the comparison circuit section, whereby the strength of the power by the input setting section is controlled. And the control for compensating for the decrease in power due to dust clogging or the like can be simultaneously controlled on the same basis.

[0010] Since the sawtooth reference wave is formed by a zero-cross detecting section based on an AC power supply and a power supply section forming a constant voltage waveform from the AC power supply, phase control synchronized with the AC power supply supplied to the electric blower is achieved. can do.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a vacuum cleaner according to the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an input controller of a vacuum cleaner according to the present invention. In FIG. 1, a sawtooth reference wave S as shown in FIG. 3 is created by a sawtooth wave generation unit 3 from a constant voltage generated by a power supply unit 1 and a zero-cross detection unit 2. The input setting unit 4 switches between low, medium, and high power of the electric blower, and determines the power state D at that time by dividing the voltage with the slide volume and the resistance.
C level is being created. The DC level of the input setting unit 4, the output of the sawtooth wave generation unit 3, and the output of the detected current of the main body motor 8 are input to a comparison circuit unit 6 and compared. Then, the sawtooth reference wave and the D
During the phase angle based on the difference from the C level, the power supplied to the main body motor 8 is turned on by the input control unit 7 to supply power to the electric blower. In the control for compensating for a decrease in power due to clogging of dust, etc., the decrease in power is particularly problematic because when the operation is performed with a strong force for absorbing dust in the carpet, the suction force is reduced. In the case of driving, the control of this correction is often performed, and in this embodiment, the control of the correction due to dust clogging will be described for the case of strong operation.

The input control unit of the present invention compares the sawtooth reference wave with the DC level in the comparison circuit unit 6, and turns on the power supply circuit during the phase where the sawtooth reference wave is larger than the DC level, for example. The circuit configuration is controlled by supplying power. In the example shown in FIG.
The comparison circuit unit 6 compares the DC level of the input setting unit 4 with the sawtooth reference wave and the DC level converted by the motor current detection unit 5 and the aforementioned sawtooth reference wave. A second comparator for comparison,
The main motor is controlled by the output of the comparator having the larger phase point arc of the outputs of both comparators.

Power supply unit 1 is composed of, for example, a rectifier circuit including a diode and a smoothing capacitor and a Zener diode, and generates a DC constant voltage from an AC voltage of commercial power supply AC. The zero-cross detection unit 2 includes, for example, a resistor and a photocoupler, and the sawtooth wave generation unit 3 discharges, for example, the charge of the capacitor by the zero-cross signal from the zero-cross detection unit 2, and supplies the commercial power AC as shown in FIG. To generate a sawtooth reference wave synchronized with. The input setting unit 4, for example, as shown in FIG.
Volume resistance R that sets the strength of the electric blower power
_v and a fixed resistor R ₁ to generate a DC level in the power state set by the voltage dividing resistor R ₂ .

The current detector 5 amplifies a current branched from the circuit of the main body motor to obtain a DC level voltage. Further, as shown in FIG.
Each of the comparators 61 and 62 receives the sawtooth reference wave from the sawtooth wave generation circuit 3 and the DC level of the input setting unit 4, and the sawtooth reference wave and the DC level of the output of the current detection unit 5, respectively. Compare.
As shown in FIG. 2, the input control unit 7 controls the motor of the main body in response to the output of the larger phase point arc from the outputs of the two comparators 61 and 62 of the comparison circuit unit 6 via the phototriac coupler 71. On / off to the 8 side is controlled.

Next, comparison in the comparison circuit section 6 and control based on the result will be described. FIG. 3 shows a sawtooth reference wave S when the power of the electric blower is selected to be weak.
2 shows a comparison between the DC level I of the input setting unit and the DC level I of the sawtooth reference wave S and the DC level II of the motor current. FIG. 3A shows the input set level I and the sawtooth reference wave S, and the comparison result is shown in FIG. 3B. That is, only the phase where the level of the sawtooth reference wave S is higher than the input setting level I is “high”.
Is output. 3C shows the sawtooth reference wave S and the DC level II of the motor current, and FIG. 3D shows the comparison result. That is, the sawtooth reference wave S is larger in all phases than the DC level II of the motor current, and the result of the comparison is a "high" output result in all phase angles. As a result, since the result of (b) has a larger phase point arc than the result of (d), control is performed by the output of (b). As a result, the AC power supply is turned on only during the “high” time of (b), and the phase portion indicated by oblique lines in FIG. 3 (e) is the portion where power is applied, according to the arc of the comparison signal within one cycle. Power is supplied only during this phase.

FIG. 4 is an explanatory diagram showing the control principle when the power of the electric blower is strong (high power) and the control when dust clogging or the like occurs, using comparative waveforms similar to FIG. FIGS. 4A and 4B show D of the input setting unit.
The waveforms of the C level I and the sawtooth reference wave S and the comparison signal are shown, and FIGS. 4C to 4D show the waveform of the sawtooth reference wave S and the DC level II of the motor current and the comparison signal, respectively. ing. In this case, since the DC level of the input setting section is small and the DC level of the motor current is large, and the comparison signal between the DC level II of the motor current and the sawtooth reference wave S has a larger phase point arc, the motor current DC level II. In this state, FIG.
As shown by an arrow, when the DC level of the motor current decreases due to dust clogging, the level decreases as shown by the arrow. As a result, the "high"
Becomes longer, the arc angle of the phase point becomes smaller and the applied voltage becomes larger, as indicated by the oblique lines in FIG.
The input increases. Then, the output (power) reduced by the dust clogging is corrected.

According to the present invention, since the power supplied to the motor is controlled by the phase point arc based on the comparison between the DC level and the sawtooth reference wave, the phase control can be performed by a simple circuit configuration of the comparison circuit. It can be performed more reliably and easily. Further, the input setting unit is used to perform control based on the comparison between the DC level of the input setting and the sawtooth reference wave, and the larger phase point arc based on the comparison between the DC level of the motor current and the sawtooth reference wave. And the control for correcting a decrease in the current of the main body motor due to clogging of dust or the like can be integrally performed by the same control circuit unit.

[0019]

According to the present invention, the level generated by the input setting section and the level generated by current detection of the main body motor are set to a constant DC level, and are compared with the sawtooth reference wave, respectively. , The phase of the power supplied to the main body motor can be controlled with a simple circuit configuration.

Further, since the sawtooth reference wave is shared and the DC level of the input setting unit and the DC current of the main body motor current can be unified and compared by one comparison circuit unit, it is not necessary to adjust the level of the control circuit. With the control circuit having the configuration, it is possible to perform both control of selection of the input setting unit and correction of power reduction due to dust clogging or the like.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control circuit unit of a vacuum cleaner according to the present invention.

FIG. 2 is a diagram illustrating a specific circuit example of an input setting unit, a comparison circuit unit, and an input control unit in FIG. 1;

FIG. 3 is a diagram illustrating an example of control when an input setting unit is weak;

FIG. 4 is a diagram illustrating an example of control when an input setting unit is strong and when power is reduced due to dust clogging.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power supply part 2 Zero cross detection part 3 Sawtooth wave generation part 4 Input setting part 5 Current detection part 6 Comparison circuit part 7 Input control part 61 Comparator 62 Comparator

Claims (3)

[Claims] 1. An electric blower, an input setting unit for setting strength of electric power supplied to the electric blower, a current detecting unit for measuring a current for driving the electric blower, and controlling electric power supplied to the electric blower An input control unit that performs phase control by a phase point arc output from a comparison circuit unit that compares the DC level of the input setting unit or the current detection unit with the sawtooth reference wave. Vacuum cleaner to do. 2. The method according to claim 1, wherein the comparing circuit unit is a DC unit of the input setting unit.
A first comparator for comparing the level with a sawtooth reference wave,
And a second comparator for comparing the DC level of the current detection section with the sawtooth reference wave, wherein the input control section has a large phase point arc of the output of each comparator of the comparison circuit section. The electric vacuum cleaner according to claim 1, wherein electric power supplied by the output is controlled. 3. The vacuum cleaner according to claim 1, wherein the sawtooth reference wave is formed from a zero-crossing detection unit based on an AC power supply and a power supply unit that forms a constant voltage waveform from the AC power supply.