JPH0790014B2 - Vacuum cleaner controller - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller for an electric vacuum cleaner that controls the input of a motor by sliding a variable resistance.

2. Description of the Related Art A conventional vacuum cleaner control device has a configuration shown in FIG. In FIG. 4, reference numeral 51 is a power supply, in which a motor 52 and a bidirectional thyristor 53 are connected in series. A trigger element 54 is connected to the gate of the bidirectional thyristor 53, and one side of the trigger element 54 is provided. The capacitor and resistor 56 are connected. 57 is a variable resistor, and a switch 58 is connected to both ends thereof. Reference numeral 59 is a current limiting resistor.

In the above configuration, the current flowing through the current limiting resistor 59 → the variable resistor 57 → the resistor 56 is charged in the capacitor 55, and when the charge voltage of the capacitor 55 reaches the ON voltage of the trigger element 54, a trigger pulse is generated and the bidirectional thyristor is generated. 53 turns on and the motor 52 rotates. Here, the charging time constant of the capacitor 55 is changed according to the change of the resistance value of the variable resistor 57, and the motor 52
However, if the switch 58 is closed at this time, the motor 52 becomes full power regardless of the resistance value of the variable resistor 57.

However, in the control device of the conventional configuration, if the resistance of the variable resistor 57 is any value, the switch 58 is always full power, so when cleaning the curtain or the like with a weak input, for example. , There was a section where pressing the switch 58 would cause the curtain to stick and prevent cleaning.

The present invention is a switching element connected in series with a motor,
A trigger circuit that triggers this switching element, and a series circuit of a switch and a variable resistor that supplies electric power to the trigger circuit are provided. The variable resistor includes two variable resistors having different maximum resistance values, and each variable resistor has a different maximum resistance value. Of the sliders, and any one of the sliders is selected by the switch.

Operation In the above configuration, by changing to the other variable resistance side which is set to the resistance value resistance value proportional to one variable resistance by the changeover switch, it becomes full power regardless of the input as in the past. Can be prevented and the suction force can be changed to an appropriate value.

Embodiment An embodiment of the present invention will be described with reference to FIGS.
In FIG. 1, reference numeral 1 is a power source, and a motor 2 and a bidirectional thyristor 3 are connected in series. Bidirectional thyristor 3
The trigger element 4 is connected to the gate of the
The capacitor 5 and the resistor 6 are connected. The trigger element 4, the capacitor 5, and the resistor 6 constitute a trigger circuit that triggers the bidirectional thyristor 3. A switch 7 switches the connection between the first variable resistor 8 and the second variable resistor 9. Reference numeral 10 is a current limiting resistor. Second
A characteristic graph of stroke vs. resistance value of the first variable resistor 8 and the second variable resistor 9 is shown in the figure. Further, the sliders 11 of the first variable resistor 8 and the second variable resistor 9 are configured to slide simultaneously.

The operation of the above configuration will be described below. First, when the strokes of the first variable resistor 8 and the second variable resistor 9 are as shown in FIG. 2a, and the switch 7 is connected to the first variable resistor 8 side, the current limiting resistor 10 → first Variable resistance 8 → switch 7
→ The resistor 6 and the flowing current are charged in the capacitor 5,
When the charge voltage reaches the ON voltage of the trigger element 4, a trigger pulse is generated, the bidirectional thyristor 3 turns ON, and the motor 2 rotates. The power at that time is shown in FIG. 3b. Next, when the switch 7 is switched to the second resistor 9 side, a current flows through the second resistor 9, so that the resistance value of the second resistor 9 is larger than the resistance value of the first resistor 8. Increases to FIG. 3c, but it does not increase to the maximum power point d. In this way, by setting the increase value of the power by switching the switch 7 according to the point of each stroke, an appropriate input up / down corresponding to each cleaning surface is performed only by switching the switch 7. be able to.

As described above, according to the present invention, even if any surface to be cleaned is cleaned, for example, even if there is dust that is difficult to be collected in a concentrated manner, a stronger suction force can be obtained by simply pressing the switch, In addition, since the input is properly performed, it is possible to prevent the curtain or the like from being sucked and being unable to be cleaned, thereby improving usability.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a controller for an electric vacuum cleaner according to an embodiment of the present invention, and FIG. 2 is a graph showing the relationship between the resistance value of the first variable resistor and the second variable resistor and the stroke. FIG. 3 is a graph showing the relationship between the strokes of the first variable resistance and the second variable resistance and the power of the electric vacuum cleaner, and FIG. 4 is a circuit diagram of the conventional electric vacuum cleaner. 2 ... motor, 7 ... switch, 8 ... first variable resistance, 9 ... second variable resistance.

Claims (1)

[Claims] 1. A switching element connected in series to a motor, and a trigger circuit for triggering the switching element,
A series circuit including a switch and a variable resistor for supplying electric power to the trigger circuit is provided, and the variable resistor has different maximum resistance values.
A controller for an electric vacuum cleaner comprising a plurality of variable resistors, wherein each variable resistor is interlocked with each other, and one of the sliders is selected by the switch.