JPS59159693A - Input control circuit of motor driven blower - Google Patents

Abstract

PURPOSE:To enable to use a motor driven blower commonly as it is even if the power source cycle is different by setting a variable resistor of a reference voltage generator to generate a reference voltage of the intermediate frequency of two types of power source frequencies. CONSTITUTION:A motor driven blower 8 of an electric cleaner is connected to 50/60Hz 100V AC power source 7 through a bidirectional thyristor 9. The voltages of a capacitor C9 for starting charging by the output of a circuit 17 for detecting the zero cross of a power source and varying the charging period via a variable resistor VR1 and a reference voltage generator 13 are compared to control the thyristor 9. At this time, a variable resistor VR2 provided in the generator 13 is set to generate a reference voltage of 55-57Hz as the intermediate frequency of two types of the power sources. Accordingly, the VR2 is not made different by the frequency but can be used for the both power source frequencies as they are, thereby advantageously managing the product.

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 appearance of a conventional vacuum cleaner, in which there is a dust collection case (3) in front of the main body case (1) that can be attached and detached with a clamp (2), and a non-operating case (1). ) cover (4)
is provided with an operation section (5) and a display section (6).

Figure 2 shows the circuit configuration. Basically, an electric transmitter (8) and a bidirectional cyrisk (9) are connected in series to the AC power source (power) of 1z 100V (AC 50/60). A timer circuit α is connected to the gate of this bidirectional thyristor (9).This timer circuit (101 is a resistor R1?+R
11l The main components are an integrating circuit with a capacitor C9, a comparator amplifier circle, and a bidirectional thyristor (12).In addition, a diode D3°, a resistor R, 4, R, , R,
7, Horse 1. -2. Resistance ratio 1 forming the Q floor of the reference voltage generation circuit
111R201VB2. Here, variable resistance VR, which is varied by operating the operating section (5),
The input from is given to diode D3. Such a timer circuit (10) is supplied with DC power, and therefore, a remote control circuit (1 line) is connected to the AC power supply (i.e., Zener diode ZD,
The 15V line is secured by the Zener diode ZD2, and the 7.5V line is secured by the Zener diode ZD2.
~C7, transistor Tr1, unidirectional thyristor (1
5) It consists of a hand switch field.

R, 2 is a current limiting resistor, Rs + FLs is a resistor for preventing electric shock, R5 is a current limiting resistor, R is a gate protection resistor, R, 11, , Rg is a bleeder resistor, and the timer circuit ( Zero cross detection circuit f for IG
17) is connected. Zero cross detection circuit (I7)
is based on transistors '1''r2 to Tr5,
Resistance R, 2, R, .

R10+"18 r, etc., where the transistor T r 6 is connected in parallel to the capacitor C9.

Further, the voltage dividing resistors R, 2, R, 3 are connected in parallel to the AC power source (7).

In such a configuration, a variable resistance v is connected to the diode D3.
The setting signal R is input, and the potential at point A of the capacitor C0 gradually rises due to the action of the Sakura branch circuit. At this time,
Comparison amplifier ←υ is resistance Rho t V) k y R20
A reference voltage is set 9, and when the potential at point A becomes higher than this reference voltage, the output of the comparison amplifier aυ becomes H level. As a result, a current flows through the gate of the bidirectional thyristor Q in the previous stage, turning on the bidirectional thyristor α, thereby gate-triggering the bidirectional thyristor (9) and turning it on. Here, the set value (reference voltage) at one terminal of the comparator amplifier I determines the lowest voltage of the electric blower (8), so it is necessary to increase the input value by changing the slope of the integrating circuit, so that the bidirectional The input is controlled by changing the conduction time of the thyristor (9). Then, a zero cross detection circuit o7 for such a timer circuit α■
) operation is explained. Now, in the positive direction of AC, transistor Tr2 is ON L and transistor Tr B is OFF.
becomes.

Therefore, transistors Tr4 and Tr5 OF
There is F.T. Then, at the moment when the alternating current turns from the positive direction to the negative direction and has a zero potential rough loss, transistor Tr2 is turned off.
L Tetran risk Trl will be turned ON. Therefore, the charge stored in the capacitor C0 is discharged by this transistor Tr5, and the potential at point A drops to OV. Then, after the zero potential crosses, when the operating voltage is reached in the negative direction, the transistors Tr3 and Tr4 are turned on and the transistor Tr5 is turned off. At this time, the timer circuit 00) starts operating and starts charging the capacitor C0. When the potential at point A reaches a predetermined voltage, the bidirectional thyristor (9) is turned on by the action of the comparison amplifier αυ and the bidirectional thyristor α, as described above. After that, the moment the AC changes from the negative direction to the positive direction and crosses zero potential, the transistor Tr3.

Tr4 turns OFF and transistor Tr5 turns ON9.
, the charge of capacitor C9 is discharged, and the potential at point A becomes OV
become. Then, after the zero potential cross, when the operating voltage becomes positive, the transistor Tr2 turns ON, and the transistor 1r turns OFF. Therefore, similar operations are repeated.

When the AC crosses the zero potential, the capacitor C1 is discharged, the timer circuit QCj does not operate, and the operating voltage after the zero potential cross causes the transistor Tr2 or T
When r3 turns on and transistor Tr6 turns off, the timer circuit starts operating and charging of the capacitor C9 is started, and when the potential at point A reaches a predetermined value, the bidirectional thyristor (9) turns on. It is something that □. The charging cycle of capacitor C is determined by variable resistor VR.
Varies depending on the DC output voltage of 1.

Here, the voltage divided by the resistors R14t, B, . . . does not become lower than the set voltage even if the variable resistor vR1 is slid in the lowest input direction, so the electric blower (8) does not stop.

Therefore, at the lowest input of the variable resistor VR, the electric blower (
The reference voltage is set by adjusting the variable resistor VR so that 8) is driven by the setting input.

Problems with the background technology However, in Japan, for example, as an AC power source (7),
There are two types of power supply frequencies, Hz and 60Hz, and the variable resistor VR is adjusted separately for 511z and 60H2, so it is necessary to differentiate between them during mass production 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 a reference voltage generation circuit with a resistor that generates a reference voltage that is set as a setting input at a setting position of an operation section by using an AC power source with an intermediate frequency between two types of power supply frequencies. However, it is configured so that it can be used as is regardless of the power supply frequency.

Examples of the invention An embodiment of the present invention will be described with reference to the drawings.

Although the circuit of this embodiment is similar to the conventional one, it is characterized by the resistance vR2 in the reference voltage generation circuit.

In other words, when an AC power source (7) with an intermediate frequency of two types of power supply frequencies, 5oHz and 6011z, for example, 55H2, is used for this resistor Vl', the setting input at the setting position of the operation section (5) is performed. The resistance value is adjusted to produce a reference voltage set so that This device having the resistance VR adjusted in this way can be used in both 50Hz and 60Hz regions. In this case, the time constant circuit of resistor R, 7 and capacitor C0 is also selected to have a constant that does not cause any problem in both power supply frequency ranges. Further, the constant of the resistor Rho*R20 is also selected within a range that can be adjusted in both power supply frequency ranges.

Therefore, according to this embodiment, compared to the conventional example which requires individual adjustment work, it is possible to eliminate the trouble of adjustment by only targeting one frequency, and it can be used as it is in both power supply frequency ranges, requiring less maintenance. This is no longer necessary, and product management is also advantageous. In addition, since the frequency-dependent performance is guaranteed using the constant voltage reference voltage of the comparison amplifier αυ, the range of variation in adjustment can be narrowed.

By the way, in the case of 50 Hz and 60 Hz, the intermediate frequency is preferably 55 to 57 Hz, which is 60 Hz. This is 6
In the case of a power supply frequency of 0 Hz, the suction performance is inferior to that in the case of 50 Hz, so the intermediate frequency 16011 for adjustment is
This is to shift it to the z side. In other words, while comparing the individual performance of 50H2° and 60Hz, 55 to 57H
This is to arbitrarily change the frequency between the two frequencies to prevent large variations in performance between the two frequencies.

Effects of the Invention Since the present invention is configured as described above, it can be used as is in different power supply frequency regions, and maintenance is not required. Because it is performed using voltage,
The range of variation in adjustment can be narrowed, and if the intermediate frequency is set to the higher power supply frequency υ, better balance can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view, and FIG. 2 is a circuit diagram.

Claims (1)

[Scope of 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 charging is started according to the DC output voltage obtained by operating the operation unit. A capacitor whose charging period changes is provided, and 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. The reference voltage generation circuit is equipped with a resistor that generates a reference voltage set at the setting position of the operating section by using a variable current power supply with an intermediate frequency between the two types of power supply frequencies that can be used in the product. An electric blower input control circuit characterized by: 2. The electric blower input control circuit according to claim 1, wherein the intermediate frequency is an intermediate frequency closer to a higher power supply frequency.