JPH0350864Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a remote control device for a vacuum cleaner.

BACKGROUND ART Conventionally, as seen in Japanese Utility Model Publication No. 57-20127, there has been known a remote control device that controls the speed of an electric blower motor using a variable resistor. FIG. 2 shows this conventional remote control device, in which an AC power source 1 is connected in series with a motor 2 and a bidirectional thyristor 3 built into a vacuum cleaner. 4 is a trigger diode that triggers the bidirectional thyristor 3;
The trigger diode 4 is connected to a capacitor 5, which is charged through a series circuit of a highly sensitive bidirectional thyristor 6 and a variable resistor 7. A trigger signal is applied to the gate of the bidirectional thyristor 6 by a remote control switch 8.

By turning on the remote control switch 8, the bidirectional thyristor 6 becomes conductive, and the capacitor 5 is charged through the variable resistor 7. When the terminal voltage of the capacitor 5 reaches the breakover voltage of the trigger diode 4, the diode 4 is turned on. A conductive state is established, current flows through the bidirectional thyristor 3, and the motor 2 rotates. At this time, if the value of the variable resistor 7 is changed, the time constant determined by the capacitor 5 and the variable resistor 7 is changed, and the capacitor 5
Since the time it takes for the terminal voltage to reach the breakover voltage changes, the conduction angle of the bidirectional thyristor 3 changes and the rotational speed of the motor 2 changes.

Problems to be Solved by the Invention In such a conventional configuration, the bidirectional thyristor 3 cannot be made conductive until the charging voltage of the capacitor 5 exceeds the breakover voltage of the trigger diode 4, and the voltage between is not applied to the motor 2, so the rotational speed of the motor 2 also decreases accordingly. Further, the remote control switch 8 and the variable resistor 7 are arranged separately, and the value of the variable resistor 7 cannot be changed at the hand.

This invention allows you to change the value of the variable resistor at the hand,
Moreover, it is an object of the present invention to provide a remote control device that can widen the speed control range of a motor by reducing power loss in a bidirectional thyristor.

Means for Solving the Problems The vacuum cleaner remote control device of the present invention connects a bidirectional thyristor in series to the power supply circuit of the motor of an electric blower, and connects a first transistor to the gate of the bidirectional thyristor. and a second transistor to the base of the first transistor.
A capacitor is connected to the base-emitter of the second transistor, and the capacitor is charged through a third transistor, and the third transistor is charged via a remote control variable resistor. The feature is that a voltage is applied to the base of.

Function According to this configuration, the motor can be turned on and off and its speed can be controlled simply by operating the remote control variable resistor installed at hand, and the bidirectional thyristor can be controlled via the first and second transistors. Since the bidirectional thyristor is controlled, the bidirectional thyristor becomes conductive when the on-voltage of the third transistor is obtained.

Embodiment Hereinafter, an embodiment of the present invention will be described based on FIG. 11 is an AC power source, and a motor 12 and a bidirectional thyristor 13 built into the vacuum cleaner are connected in series to this power source 11. A resistor 14 and a capacitor 15 for surge protection are connected in parallel to the bidirectional thyristor 13. Reference numeral 16 denotes a trigger transistor for triggering the bidirectional thyristor 13, the collector of which is connected to the gate of the bidirectional thyristor 13. The base of the transistor 16 is connected through a resistor 17 to the collectors of trigger pulse generating transistors 18 and 19, and a charging capacitor 20 and a resistor 21 are connected in parallel between the bases of the transistors 18 and 19. 22 and 23 are charging transistors, the emitter of the transistor 22 and the emitter of the transistor 23 are connected to the capacitor 20, and the collector of the transistor 22 and the collector of the transistor 23 are connected through reverse current blocking diodes 24 and 25, respectively. current limiting resistor 2
6. Further, both bases of the transistors 22 and 23 are connected to each other and connected to one end of a resistor 28 via a variable resistor 27 with a switch. The other ends of the resistors 26 and 28 are connected to a connection point between the motor 12 and the bidirectional thyristor 13. 29 is a current limiting resistor, 30 is a diode, and creates a half-wave rectified negative power supply. 31 is a voltage limiting diode, and 32 is a smoothing capacitor, which generates a power source for the transistor 16. Voltage limiting diodes 33 and 34 suppress voltage fluctuations in the circuit.

The operation of the remote control circuit configured as above will be explained below.

When the resistance value of variable resistor 27 is infinite, transistors 22 and 23 are cut off, and resistor 26
No current flows through. Therefore, capacitor 20
is not charged and its terminal voltage does not rise, so
Transistors 18 and 19 remain cut off,
No current flows through the resistor 17, and no trigger current flows through the transistor 16 either. Therefore, the bidirectional thyristor 13 is not triggered and is in a non-conducting state so that no current flows and the motor 12 does not rotate.

On the other hand, when the resistance value of the variable resistor 27 is zero ohm, the transistors 22 and 23 are in a saturation state, and the current flowing from the current limiting resistor 26 to the transistor 22 or 23 charges the capacitor 20, and the terminal of the capacitor 20 When the voltage reaches the on-voltage of transistors 18 and 19, transistors 18 and 19 conduct and the current is amplified by transistor 16 through resistor 17 to generate a trigger pulse for bidirectional thyristor 13. This trigger pulse causes the bidirectional thyristor 13 to become conductive, causing the motor 12 to rotate. At this time, if the value of the variable resistor 27 is changed, the time constant determined by the capacitor 20, the transistor 22 or 23, and the resistor 26 will change, and the time required for the terminal voltage of the capacitor 20 to reach the ON voltage of the transistors 18 and 19 will be changed. As a result, the conduction angle of the bidirectional thyristor 13 changes, and the rotation speed of the motor 12 changes.

Since an alternating current flows through the variable resistor 27 as the hand portion, anodic oxidation can be prevented even if a carbon-based variable resistor 27 is used.

Effects of the Invention As described above, the remote control device of the present invention can turn the motor on and off and control the speed by operating the remote control variable resistor at hand, and the extremely low on-voltage of the third transistor Since the bidirectional thyristor can be made conductive at the moment the bidirectional thyristor is obtained, there is almost no loss due to the bidirectional thyristor, and phase control close to zero crossing is possible, and the phase control range can be extremely wide. be.

[Brief explanation of the drawing]

FIG. 1 is a wiring diagram of an embodiment of the present invention, and FIG. 2 is a wiring diagram of a conventional remote control device. 12... Motor, 13... Bidirectional thyristor, 16... Trigger transistor [first transistor], 18, 19... Trigger pulse generation transistor [second transistor], 20...
Capacitor, 22, 23... Charging transistor [third transistor], 27... Variable resistor with switch [variable resistor for remote control].

Claims (1)

[Scope of utility model registration request] A bidirectional thyristor is connected in series to the power supply circuit of the motor of the electric blower, a collector of a first transistor is connected to the gate of the bidirectional thyristor, and a collector of a second transistor is connected to the base of the first transistor. A capacitor is connected between the base and emitter of the second transistor, and the capacitor is charged through a third transistor. A vacuum cleaner remote control device that applies voltage.