JPS6020794A - Electric blower input control circuit - Google Patents

Abstract

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

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to an electric blower input control circuit in a vacuum cleaner.

TECHNICAL BACKGROUND OF THE INVENTION FIG. 1 shows the external appearance of a conventional vacuum cleaner. In front of the main body case 1, there is a dust collection case 3 that can be attached and detached using a clamp 2.
The 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, basically AC 50/60Hz 100V
(7) An electric blower 8 and a bidirectional thyristor 9 are connected in series to the AC power source 7. A timer circuit 1o is connected to the gate of this bidirectional thyristor 9. This timer circuit 1o has resistors R17, Rle
, an integrating circuit using a capacitor C9, a comparator amplifier 11, a bidirectional thyreiter 12, and 0 other components.
, diode D3, resistor R14, Rzs, R21v
R22, resistor Rzs forming the reference voltage generation circuit 13, R2
0 and VR2. Here, the operation section 5
An input from the variable resistor VR1, which is varied by the operation of the resistor VR1, is applied to the diode D3. DC power is supplied to such a timer circuit 10, and therefore,
A remote control circuit 14 is connected to the AC power supply 7. That is, a 15V line is secured by Zener diode ZD1, and a 7.5V line is secured by Zener diode ZD2, and resistors R2 to R9, diode D+, capacitors 02 to C7, and transistor T r
h, a unidirectional thyristor 15, and a hand switch 16. R2 is a current limiting resistor, R3, R, 4
is a resistor for preventing electric shock, R5 is a collector current limiting resistor, R6
is a gate protection resistor, and R7, R8, and R9 are bleeder resistors. A zero cross detection circuit 17 is connected to the timer circuit 10. Zero cross detection circuit 17
is mainly composed of transistors Tr2 to Tr5, and includes resistors R12, R13, Rtc, etc. Here, transistors 1 to Tr are connected in parallel to a capacitor C9.

In addition, voltage dividing resistors R12 and R13 are bidirectional thyristors 9
are connected in parallel.

In such a configuration, a variable resistor V is connected to the diode D3.
'The setting signal of R1 is input, and the potential at point A of capacitor C9 gradually rises due to the action of the integrating circuit. At this time, the reference voltage of the comparison amplifier 11 is set by the resistors R19, VR2, and R20, and when the potential at the point A becomes larger than this reference voltage, the output of the comparison amplifier 11 becomes the level "■". As a result, a current flows through the gate I of the bidirectional thyristor 12 at the previous stage, turning the bidirectional thyristor 12 ON, thereby triggering the gate 1 of the bidirectional thyristor 9 and turning it ON. Here, the setting value (reference voltage) of one terminal of the comparator amplifier 11 determines the minimum input of the electric blower 8. By increasing the input value, the slope of the integrating circuit is changed, and the conduction of the bidirectional thyristor 9 is changed. Control the input by changing the time. Next, the operation of the zero-cross detection circuit 17 for such a timer circuit 10 will be explained. Now, in the positive direction of AC, transistor Tr2
is ONL, 1 to lunge; then Tr3 is turned OFF. therefore.

1-transistor Tr4. Tr5 is OFF. Therefore, at the moment when the alternating current changes from the positive direction to the negative direction and crosses zero potential, the transistor Trz turns OFF' and the transistor Tr5 turns ON. Therefore, the electric charge stored in the capacitor C9 is transferred to this transistor T r
5, the potential at point A drops to OV. After the zero potential cross, when the operating voltage is reached in the negative direction, the transistor Tr3. Tr4 is ONL, and transistor T r
5 becomes OFF.

As a result, the timer circuit 10 starts operating and charging of the capacitor C9 starts. Then, when the potential at point A reaches a predetermined voltage, the comparator amplifier 11 and the bidirectional thyristor 12 operate to generate a bidirectional thyristor 9 as described above.
turns on. After that, at the moment when the alternating current changes from the negative direction to the positive direction and crosses zero potential, the transistor Tr3. Tr4 is turned off, transistor T r 5 is turned on, the charge in capacitor C9 is discharged, and the potential at point A becomes o■.

Then, after the zero potential crosses, when the operating voltage becomes positive, the transistor Trz turns ON, and the transistor Tr5 turns OFF. Then the same action is repeated.

In other words, when the AC zero potential crosses, the capacitor C9 is discharged and the timer circuit 10 does not operate, and the transistor T r 2 or T
When r3 is turned on and transistor Tr5 is turned off, the operation of the timer circuit 10, that is, charging of the capacitor C9 is started, and when the potential at point A reaches a predetermined value, the bidirectional thyreiter 9 is turned on. It is.

The charging cycle of the capacitor C9 is determined by the variable resistor VR1.
Varies depending on the DC output voltage. Here, resistor R14
The voltage divided by °R1s does not fall below the set voltage even if the variable resistor VRt is slid in the lowest input direction, so the electric blower 8 will not stop.

Thus, the reference voltage is set by adjusting the variable resistor VR2 so that the electric blower 8 is driven by the set input when the variable resistor VR1 receives the lowest input.

However, in our country, for example, the AC power source 7 is 50H.
There are 28 types of power supply frequencies, 50Hz and 60Hz, and the variable resistor V Rz is adjusted for 50Hz and 6087, respectively, and when mass production, it is necessary to differentiate between them, and product management. It is also troublesome, and there are problems such as if the product is sold in the wrong power frequency region, it cannot be used.

OBJECTS OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide an electric blower input control circuit that can be used in common even if the power supply frequencies are different.

SUMMARY OF THE INVENTION The present invention provides two types of capacitors each having a charging cycle set to be inputted at a setting position of an operating section by using an AC power supply for each of two types of power supply frequencies that can be used, and a switching system. By switching and selectively using the power source, it is possible to save the effort of adjustment work and to easily use any power source frequency.

Embodiment of the Invention A first embodiment of the invention will be described based on FIGS. 3 and 4. FIG. Components that are the same as those shown in FIGS. 1 and 2 are designated by the same reference numerals, and description thereof will be omitted.

In this embodiment, capacitor C10 is connected in parallel with capacitor C9.
is provided, and both capacitors Cs and Cio are selectively used by a switch 18 serving as a switching means,
For example, capacitor C9 is for 5082, capacitor C1
o is for 60 Hz.

More specifically, the capacitor C9 for 50 Hz has a larger capacity than the capacitor C1o for 60 Hz, and therefore the capacitor C1a for 60 Hz, which has a shorter charging cycle, triggers the triac 9 earlier and reaches the lowest voltage. This compensates to increase the input.

In other words, the capacitor C9 has a charging cycle such that the setting input is made at the setting position of the operating section 5 by using the AC power supply 7 of 50H, z, and the capacitor C1o has a charging cycle of 6
When using a 0 Hz AC power source 7, the charging cycle is the same.

According to this embodiment, compared to the conventional example that requires individual adjustment work, it is only necessary to target one power supply frequency, which saves the effort of adjustment. /6oI (z Can be used in both power supply frequency ranges, requires no maintenance, and increases product value.

Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment is provided with a switching means 19 that automatically switches between capacitors C9 and CIO in accordance with the power supply frequency. That is, a frequency-voltage conversion circuit 2o is provided which is connected to the AC power supply 7, identifies the power supply frequency, and whose output changes, and drives the relay 21 with its output.
It switches the relay contact 22.

Therefore, according to this embodiment, the device can be used as it is in both power supply frequency ranges without requiring any switch switching operations or the like. In other words, the appearance of the vacuum cleaner is the same as in Figure 1.

In FIG. 5, the alternating current potential of the voltage dividing resistor R12 is detected by connecting it in parallel to the alternating current power source 7, but this is not essentially different from the method shown in FIG. 2 or 44.

Effects of the Invention As described above, the present invention provides capacitors for each power frequency and uses the switching means to select and use them, so it is easy to operate in both power frequency ranges without the need for troublesome individual adjustment work. Moreover, since automatic switching is adopted, operability is further improved.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a conventional example, FIG. 2 is a circuit diagram, FIG. 3 is a perspective view showing a first embodiment of the present invention, FIG. 4 is a circuit diagram, and FIG. 5 is a circuit diagram of the present invention. FIG. 7 is a circuit diagram showing a second embodiment. 5...Operation unit, 7...AC power supply, 8...Electric blower,
9... Bidirectional thyristor, 11... Comparison amplifier,
13... Reference voltage generation circuit, 18... Switch (switching means), 19... Switching means, 2o... Frequency-voltage conversion circuit, C9-C1o... Capacitor

Claims (1)

[Claims] 1. An electric blower and a bidirectional thyristor are connected in series to an AC power source, and charging is started from the time when zero potential of the AC power source is detected, and is responsive to the DC output voltage obtained by operating the operating unit. A comparator amplifier is connected to the gate of the bidirectional thyristor, which compares the charging voltage of this capacitor with the reference voltage of the reference voltage generation circuit to determine the trigger phase angle of the bidirectional thyristor. In such a device, the capacitors of type 2w1 are provided, and the capacitors have a charging cycle set so that the setting input is made at the setting position of the operating section by using an AC power source of each of the two types of power supply frequencies that can be used, and these capacitors An electric blower input control circuit characterized by being provided with a switching means for selectively switching. 2. Claim 1, characterized in that the switching means automatically switches according to the output of a frequency-voltage conversion circuit that changes the output according to the input from the power supply frequency.
Electric blower input control circuit described in Section 2.