JPS6040031A - 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] Technical field of invention The present invention relates to a vacuum cleaner.

Technical background of the invention Figure 1 shows the appearance of a conventional vacuum cleaner.

In front of the main body case 1 is a dust collection case 3 which can be attached and detached by a clamp 2, and a cover 4 of the main body case 1 is provided with an operation section 5 and a display section 6. Figure 2 shows the circuit configuration, and basically AC 50/60HzlOO
An electric blower 8 and a bidirectional thyristor 9 forming a control circuit are connected in series to an AC power source 7 of V. A timer circuit 10 is connected to the gate of the bidirectional thyristor 9. This timer circuit 10 has a resistor R
27, R2[+, an integrating circuit with a capacitor Cts, a comparator amplifier IC24, and a bidirectional thyreiter 11. In addition, resistors R31, R32, and resistors R29, R3o, and V R4 forming a voltage generation circuit are included. It is composed of: Here, the input from the variable resistor V R1, which is varied by operating the operating section 5, is applied to the resistor R2T. A DC power supply is supplied to such a timer circuit IO, and therefore a remote control circuit is connected to the AC power supply 7.

That is, 15. due to the Zener diode Z D 12.
The V line is secured, the 7.5V line is secured by the Zener diode ZD12, and the resistor R1
2~R19, diode Dt1, capacitor C12~C
17, a transistor T r 11, a directional thyristor 5CRz, and a hand switch 12. R
12 is a current limiting resistor, R13 and R14 are electric shock prevention resistors, Rzs is a collector current limiting resistor, R16 is a gate protection resistor, R1? , Ru+, R19 are bleeder resistances. A zero cross detection circuit 17 is connected to the timer circuit 10. The zero-cross detection circuit mainly includes transistors T r 12 to T r 15 and includes resistors R22, R23, R26, and the like.

Here, the transistor T r 111 is the capacitor 01
9 in parallel. In addition, voltage dividing resistors R22, R
23 is connected in parallel to the bidirectional thyristor 9.

In such a configuration, a setting signal for the variable resistor VR1 is input, and the potential at point A of the capacitor C19 gradually increases due to the action of the integrating circuit. At this time, the comparison amplifier I
A reference voltage is set for C24 by resistors R291VR4 and R2O, and when the potential at point A becomes higher than this reference voltage, the output of comparison amplifier IC24 becomes H level. As a result, a current flows to the gate of the bidirectional thyristor 11 in the previous stage, turning the bidirectional thyristor 11 ON, thereby gate-triggering the bidirectional thyristor 9 and turning it ON. Here, the setting value (reference voltage) of one terminal of the comparator amplifier IC 24 determines the minimum input of the electric blower 8. By increasing the input value, the slope of the integrating circuit is changed and the bidirectional thyristor 9 is turned on. Control the input by changing the time. Next, the operation of the zero-cross detection circuit for such a timer circuit IO will be explained.

Now, in the positive direction of AC, transistor T r 12 is ON.
L, 1-transistor T r 13 is turned OFF. Therefore, transistor Trz4. Trt5 is OFF. Then, at the moment when the alternating current turns from the positive direction to the negative direction and crosses zero potential, the transistor T r 12 is turned off and 1
- The transistor Tr15 is turned on. Therefore.

The charge stored in the capacitor 019 is discharged by this transistor T r 15, and the potential at point A drops to 0■. After the zero potential cross, when the operating voltage is reached in the negative direction, the transistor Tr+3. Tr14 is turned on and transistor Tr16 is turned off.

As a result, the timer circuit IO starts operating and charging of the capacitor C19 starts. Then, when the potential at point A reaches a predetermined voltage, the comparison amplifier IC24
, the bidirectional thyristor 9 is turned on by the action of the bidirectional thyristor 11. After that, at the moment when the alternating current changes from the negative direction to the positive direction and crosses zero potential, the transistor Tr13.
Trt4 turns off and 1-transistor r r 1! l
turns on, the charge of capacitor C19 is discharged, and A
The potential at the point becomes ov. Then, after the zero potential cross, when the operating voltage is reached in the positive direction, the transistor T r 12 turns O
NL, the transistor T r 15 is turned off. Therefore, similar operations are repeated.

That is, when the AC zero potential crosses, the capacitor CI9 is discharged and the timer circuit 10 does not operate, and at the operating voltage after the zero potential cross, the transistor Tr 12 or Tr 13 turns ON, and the transistor Tr 15 turns OFF. By doing so, the operation of the timer circuit 1°, that is, the charging of the capacitor C19 is started, and when the potential at the point A reaches a predetermined value, the bidirectional thyriter 9 is turned on.

The operation part 5 is the output from the sensor (automatic) with the switch SW.
and the output (manual) from the variable resistor VR1.

The sensor section 13 operates by detecting the magnitude of the air volume during dust collection with an operating body, for example, a flap, and converting the movement into an electrical signal, and is provided with a converting body. Here, a ball element IC3 is used. That is, the magnets 1 to 1 are placed on the flap side, and the Hall element IC3 is placed on the opposite fixed side to capture changes in the magnetic field. Here, take out the output from the 2nd and 4th pins of the Hall element IC3.

A constant current is supplied through pin 1.3. Further, the operational amplifier IC21 constitutes a constant current power source for driving the Hall element IC3 with a constant current. and.

The operational amplifiers IC22 and IC23 constitute a sensor signal amplifier, and the first stage IC22 performs differential amplification, and the next stage IC23 performs off-cellar 1 adjustment and gain adjustment. It is given to the sensor output terminal of SW. Here, the gain is set so that it decreases as the slider of the variable resistor VR3 moves toward the output side of the IC 23, and increases toward the ground. Also, the variable resistor V R2 for off-cellar 1 adjustment is 1. This will correct the variation in C3.

Therefore, the 1 display circuit 14 includes an LED D as a light emitting element.
t, D2. D3. D4 are connected in series, and the comparison amplifier ICI is connected under the comparison voltage source by resistors R1 to R4.
], ICI 2', and ICI 3 control the lighting.

Here, the LED Dl is always lit and also serves as a pilot. In addition, the outputs of comparison amplifiers IC11 to ICI3 are open collectors, and each switching causes L
EDDt to D4 flash, and the LED
It is connected to each connection point of D1 to D4. FIG. 3 shows an equivalent circuit near this display circuit 14, and each comparison amplifier c11 to ic13 has a transistor T inside.
It has built-in transistors r1 to Tr3 and is an open collector. The comparison voltage is set by the resistors R1, R2, R3, and R4 using the 7.5V line as a power source.For example, when the signal output from the operation unit 5 becomes higher than the comparison voltage of the ICI1, the transistor Tr
z is turned off, and transistors Tr2. Tr3 is ON
Since it remains as it is, the LEDs Dz and D2 will light up. Then, when the signal output becomes higher than the comparison voltage of ICI 2, the transistor T r 2 also becomes 0'FF, and the LEDs Dl, D2 . D3 will light up.

Here, power is supplied to the LED through the resistors R7 and Re, and since the resistor R6 is set to constitute a constant current circuit, the LED that should be lit once is
The brightness remains almost the same regardless of the number of lights. With such a plurality of LEDs, the air volume is automatically displayed in proportion to the movement of the flap, and when it is manually displayed, it is displayed in relation to the position of the variable resistor vR1.

In other words, the display is proportional to the input control amount.

Problems with the conventional technology In such a conventional system, the terminal L E DD4
should be lit when all the transistors Trz to Tr3 are turned off. However.

Transistor Tr1. When Tr2 is 0FFL and 1-transistor Tr3 is ON, this transistor Tr
3's ON voltage reaches about 0.6-IV, and current also flows to LED D4, so LED D4, which should not be lit when this ON voltage is large, also lights up brightly.
The display state becomes unclear.

purpose of invention The present invention was made in view of these points.

It is an object of the present invention to provide a vacuum cleaner that uses a display circuit formed by connecting a plurality of light emitting elements in series and can perform accurate display according to signal input.

SUMMARY OF THE INVENTION The present invention connects a diode between the light emitting element at the end and the power supply, thereby making it possible to reliably control the problem of turning on and off the light emitting element at the end through current control using the diode, and to respond to signal input. The structure is such that accurate display can be performed.

Embodiment of the Invention A first embodiment of the present invention will be described based on FIG. Components that are the same as those shown in FIGS. 1 to 3 are denoted by the same reference numerals, and description thereof will be omitted. In this example, the terminal LED D
A diode D5 is connected between 4 and the power supply (ground side).

In such a configuration, the current that tends to flow toward the LED D4 when the transistor Tr3 is turned on is reduced because a potential difference is created by the inserted diode D5, and the LEI) D4 does not light up. That is, diode D5
One piece has a voltage of about 0.6V, and by connecting it in series to LED D4, it can be adjusted to a potential difference that visually indicates that it is not lit.

Next, a second embodiment of the present invention will be described based on FIG. 5. In this embodiment, a Zener diode ZD is used in place of the diode D5.

Here, the Zener voltage of the Zener diode ZD is set to be 1 to more than the ON voltage of the transistor Tr3.

According to such a configuration, compared to the above embodiment.

When the transistor Tr3 is turned on, the current flowing to the LED D4 is blocked by the Zener diode ZD, and the LED
D4 can be reliably maintained in an unlit state. Then, when the transistor Tr3 is turned off, the Zener diode ZD becomes conductive so that current also flows through the LED D4, and the LEDs D1 to D4 are turned on. At this time,
Since the voltage drop caused by the Zener diode ZD is compensated for by the resistor R6, which constitutes a constant current circuit, the LED
There is almost no change in the brightness of Dz to D4.

Effects of the Invention Since the present invention is configured as described above, even for the terminal light emitting element, which is a problem, the current can be reduced or set to 0 when it should not be lit by a diode inserted between it and the power source. Can be maintained in a dark state,
Therefore, the display by the plurality of light emitting elements can be made accurate according to the signal input.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view, FIG. 2 is a circuit diagram showing a conventional example, FIG. 3 is an equivalent circuit diagram of a part thereof, FIG. 4 is an equivalent circuit diagram showing a first embodiment of the present invention, and FIG. FIG. 5 is an equivalent circuit diagram showing a second embodiment of the present invention. 7... AC power supply, 8... Electric blower, 9... Bidirectional thyristor (control circuit), 14... Display circuit, D1
~D4...LED (light gripping element), IC11~ICl
3... Voltage comparator, D5... Diode, ZD...
・Zena diode (diode) Applicant Tokyo Electric Corporation

Claims (1)

[Claims] An electric blower and a control circuit are connected in series to an AC power source, and multiple light emitting elements are connected in series to display an indication according to changes in voltage, air volume or pressure of the electric blower, or changes in a variable resistor for manual adjustment. A connected display circuit is provided, the output of the voltage comparator is connected to the connection point of which light emitting element, and a diode is connected between the light emitting element at the end of the light emitting element and the power source. Vacuum cleaner.