JPS63229022A - Control apparatus of electric cleaner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vacuum cleaner with a power control function.

2. Description of the Related Art Conventionally, a control device for this type of vacuum cleaner has been constructed as shown in FIG.

In Fig. 2, when the secondary side of the pulse transformer 1 is short-circuited with the hand switch 2, current flows through the resistor 3, the voltage across the resistor 3 increases, the capacitor 4 is charged, and the transistor 5
conducts. As the transistor 5 becomes conductive, the collector potential at the point A is reversed from the high potential of the DC power supply 6 to the ground potential. The logic circuit 7 increments the coefficient of the counter 8 every time it detects that the collector potential at point A is inverted to the ground potential. A bidirectional thyristor 10 connected in series to the power supply circuit of the electric blower 9 is phase-controlled via a phase control circuit 11 based on the coefficient value of the counter 8 .

According to this conventional configuration, the counter 8 has a count value of “0”.
The count value increases step by step every time the hand switch 2 is operated, and when the count value reaches the maximum, when the hand switch 2 is further operated, the count value of the counter 8 increases to II O.
It is a ring type counter that is II, and has a hand switch 2.
Each time you press , the power of the electric blower 9 increases step by step and turns off at a certain point, which is repeated.

Problems to be Solved by the Invention In the conventional configuration shown in Fig. 2, the power controller 1 to roll direction is only in one direction, rising, and if you want to make a weak suction force, press the 1-hand switch 2 many times. There was an inconvenience that the counter 8 had to be rotated once.

SUMMARY OF THE INVENTION An object of the present invention is to provide a control device for a vacuum cleaner that can be expected to operate stably over a long period of time and that can control the power of an electric blower to either the up or F-down sides.

Means for Solving the Problems The vacuum cleaner control device of the present invention includes a bidirectional thyristor connected in series to the power supply circuit of the electric blower.
A first photocoupler configured to perform phase control according to the terminal voltage of a capacitor connected to the input of the phase control circuit, and whose output conducts when a positive polarity current flows through the input to charge the capacitor. and a second photocoupler whose output conducts to discharge the capacitor when a negative polarity current flows through the input, and connects the inputs of the first and second photocouplers connected in parallel to the AC power source. A switching circuit is provided between the capacitor and the capacitor to switch the energization state between positive polarity, negative polarity, off, and alternating current, and the switching circuit is operated to control the terminal voltage of the capacitor to control the power of the electric blower. It is characterized by

According to this configuration, the switching circuit controls the charging/discharging state of the capacitor by selecting the type of voltage applied to the first and second photocouplers, and operates the switching circuit to power the electric blower. control.

Example Hereinafter, one embodiment of the present invention will be described based on FIG. 1.

Components having the same functions as those in FIG. 2 showing the conventional example are designated by the same reference numerals and their explanations will be omitted.

The terminal voltage of a single capacitor 12 is applied to the input of the phase control circuit 11, and charging and discharging of the capacitor 12 is switched by first and second photocouplers 13 and 14. The first and second photocouplers 13 and 14 are composed of a light emitting diode on the input side and a phototransistor on the output side, and the output side of the first photocoupler 13 is connected to the base of the transistor 16 via a resistor 15. 2nd
The output side of the photocoupler 14 is connected to the capacitor 12 via a resistor 17 to form a discharge circuit. Note that the transistor 1G is connected in series with the charging circuit of the capacitor 12 between the emitter and the collector.

The input sides of the first and second photocouplers 13.14 are connected in antiparallel to each other, and the input sides of the first and second photocouplers 13.14 connected in antiparallel are connected to the tip of the suction hose. It is connected to the secondary winding 20 of the transformer 19 via the provided switching circuit 8.

The switching circuit 18 connects one end d of the first hand switch 21 to one end of the secondary winding 20, and connects the other end e of the first hand switch 21 to the common contact f of the second hand switch 22.
The first contact K of the second hand switch 22 is connected to the common contact of the third hand switch 23, and the first contact j and the second contact j of the third hand switch 23 are connected to In between, the J-th rectifier diode 24 is connected with the second contact J side as an anode, and the first contact i of the third hand switch 23 and the second contact of the second hand switch 22 are connected. 2nd in between
A second rectifier diode 2 with the side as the cathode at the contact point of
5 is connected, and between the first contact i of the third hand switch 23 and the other end of the secondary winding 20, there are first and second photocouplers 13.14 whose input sides are connected in antiparallel. It is connected.

With this configuration, when the first hand switch 21 is turned on and the second and third hand switches 22 and 23 are placed in the state shown in FIG. 1 (standby state), the first and second photocouplers 13. The AC voltage generated in the secondary winding 20 of the transformer 19 is directly applied to the input of the transformer 14, and the first photocoupler 13 is activated during the positive polarity period, and the second photocoupler 13 is activated during the negative polarity period.
The photocoupler 14 becomes conductive. First photocoupler 1
3 becomes conductive, the transistor 16 becomes conductive and the DC power supply 6
The capacitor 12 is charged through the resistor 26, and when the second photocoupler 14 becomes conductive, the capacitor 12 is discharged through the resistor 17. In this way, in the standby state, charging and discharging are performed alternately every half cycle of the commercial power supply 27 so that the terminal voltage of the capacitor 12 does not rise above a predetermined voltage, and the phase control circuit 11 controls the capacitor 12. The bidirectional thyristor IO is configured not to be triggered when the terminal voltage of the bidirectional thyristor IO is below this predetermined voltage.

When the third hand switch 23 is placed on the side of the first rectifier diode 24 from the standby state, the AC voltage of the secondary winding 20 is half-wave rectified by the first rectifier diode 24 and becomes a voltage of only positive polarity. 1st. Second photocoupler 1.3
．． Of the 14 surface-input light emitting diodes, only the light emitting diode of the first photocoupler 13 lights up, and the phototransistor of the first photocoupler 13 becomes conductive to charge the capacitor 12. As a result, the terminal voltage of the capacitor 12 rises above the predetermined voltage, and the phase control circuit 11
As the terminal voltage of the capacitor 12 increases, the phase of triggering the bidirectional thyristor 10 is gradually advanced to increase the operating power of the electric blower 9.

Next, when the third hand switch 23 is turned back on at the first point in time when the necessary operating power is obtained, an AC voltage is applied to the inputs of the first and second photocouplers 13 and 14. Since the capacitor 12 repeats charging and discharging every half cycle,
The terminal voltage of the capacitor 12 changes around the terminal voltage at the first time point.

The phase control circuit 11 is configured not to respond to half-cycle fluctuations in the terminal voltage of the capacitor 12, and the electric blower 9 is maintained at the operating power at the time the third hand switch 23 is returned to its original state. be driven.

If you want to reduce the operating power, put the second hand switch 22 on the side of the second rectifier diode 25, and the AC voltage of the secondary winding 20 will be half-wave rectified by the second rectifier diode 25. The voltage is only of negative polarity, and only the light-emitting diode of the first 7=2 photocoupler 14 of the first and second photocouplers 13 and 14 lights up, and the phototransistor of the second photocoupler 14 becomes conductive. When the capacitor 12 is discharged and the second hand switch 22 is turned back on at a second point in time when the operating power has decreased to the target operating power, the operating power is maintained at the second point in time.

In this way, the operating power can be changed from an arbitrary operating power to either an increasing direction or a decreasing direction by operating the second and third hand switches.

Although the direction of change in operating power can be selected by operating the first to third hand switches 21, 22 and 23 as described in 1., the electric cord connecting the main body of the vacuum cleaner and the hand part is Since there are only two cords 28 and 29, a conventional suction hose with two cords 28 and 29 running along the suction hose can be used as is.

Effects of the Invention According to the present invention, a capacitor is connected to the input of the phase control circuit, and the output is made conductive to charge the capacitor when a positive current flows through the input. A second photocoupler is provided to photocoupler 1, and a second photocoupler is provided whose output conducts to discharge the capacitor when a negative polarity current flows through the input, and the first photocoupler is connected in parallel.
, a switching circuit is provided between the input of the second photocoupler and the AC power source to switch the energization state to positive polarity, negative polarity, off, and AC, and the switching circuit is operated to control the terminal voltage of the capacitor. Since the electric blower is configured to power control the electric blower, it is possible to select the direction of change in operating power by operating the switching circuit, and unlike conventional methods, the operating power cannot be decreased unless it is set to the maximum operating power. The operability is improved compared to the previous version.

Moreover, the switching circuit changes the voltage applied to the input side of the first and second couplers to alternating current, positive polarity, or negative polarity to change the charge/discharge state of the capacitor. It is only necessary to connect the provided switching circuit to the vacuum cleaner main body with two electrical coats, and no separate wiring is required, resulting in a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a vacuum cleaner control device of the present invention, and FIG. 2 is a block diagram of a conventional vacuum cleaner control device. 9... Electric blower, 10... Bidirectional thyristor,
11... Phase control circuit, 12... Capacitor, 13
．． 14...first and second photo couplers, 18...
Switching circuit, 19...Transformer, 21, 22.23...
・First, second, third hand switches, 24, 25...
-First and second rectifier diodes.

Claims (1)

[Claims] 1. A bidirectional thyristor connected in series to the power supply circuit of the electric blower is configured to perform phase control according to the terminal voltage of a capacitor connected to the input of the phase control circuit, and a positive current is applied to the input. A first photocoupler is provided whose output conducts when current flows to charge the capacitor, and a second photocoupler whose output conducts and discharges the capacitor when a negative polarity current flows through the input. , is interposed between the inputs of the first and second photocouplers connected in parallel and the AC power supply, and the energization state is set to positive polarity, negative polarity,
A control device for a vacuum cleaner, which includes a switching circuit that switches between off and alternating current, and controls the terminal voltage of the capacitor by operating the switching circuit to control the power of an electric blower.