JPS59159694A - 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 reference voltage of a reference voltage generator by selectively switching a resistor in response to the two types of the power source frequencies by a switch. 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, two resistors VR2, VR3 in response to the two types of the power source frequencies and a switch 18 are provided in the generator 13, and selectively switched according to 50Hz, 60Hz. Accordingly, even if the power source frequency is different, it can be used in an adequate state, and the irregular width of regulation can be narrowed.

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 Figure 1 shows the external 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 using a clamp (2); +1) cover (
4) is provided with an operation section (5) and a display (6). Figure 2 shows the circuit configuration, which basically consists of an AC 50/60 Hz 100V AC power supply (7).
In contrast, an electric blower (8) and a bidirectional thyristor (9) are connected in series. A timer circuit (11) is connected to the gate of this bidirectional thyristor (9).This timer circuit (1G is a resistor Rs7.Bt
s, integration circuit by capacitor C8, comparison amplifier α
υ, bidirectional servo r Mainly for IJ star a, in addition to this, diode D3 + resistor R + 41 ks r
g, 71 '211 ``22 to reference voltage generation circuit 0
It is composed of resistors R□, FLxo, and V-, which have a rising voltage. Here, the input from the variable resistor VR, which is varied by operating the operating section (5), is applied to the diode D. A DC power source is supplied to such a timer circuit section, and therefore a remote control circuit (b) is connected to the alternating current power source (7). In other words, the Zener diode zD1 secures the 15V line, and the Zener diode zD2 secures the 7.5V line.
6~C1, transistor Trl, unidirectional thyristor u5), hand switch (le). The bird is a current limiting resistor, Rs-R4 is an electric shock prevention resistor, the bird is a current limiting resistor, 1 (6 Has gate protection resistance, horse.

R11,R, is a bleeder resistance. A zero cross detection circuit η is connected to the timer circuit 00). The zero cross detection circuit aη is a transistor 'Fr
It mainly consists of 2 to Tr6, and has a resistance of “I!TR+3”.
+ Contains RI6 tR16, etc. Here, the transistor Tr4 is connected in parallel to the capacitor C0. Also, the voltage dividing resistor R12rRI3 is connected in parallel to the AC' power supply.

In such a configuration, a variable resistor ■ is connected to the diode Ds.
The setting signal of 几1 is input, and the potential at point A of the capacitor C0 gradually rises due to the action of the integrating circuit. At this time,
Comparison amplifier aυ is a resistance horse. , VRq, Rz.

A reference voltage is set by A, and when the potential at point A becomes higher than this reference voltage, the output of the comparator amplifier (Lυ) becomes H level.
A current flows through the hot water gate, turning the bidirectional thyristor circle ON, and thereby the bidirectional thyristor (9) is gate-triggered and turned ON. Here, the setting value (reference voltage) at one terminal of the comparator amplifier I determines the minimum input of the electric blower (8), so by increasing the input value, or by changing the slope of the integrating circuit, both The input is controlled by changing the conduction time of the tropic thyristor (9). Next, the operation of the zero-cross detection circuit for such a timer circuit (10) will be explained. Now, in the positive direction of AC, transistor Tr2 is ONL, and transistor Tr3 is OFF.
becomes.

Therefore, transistors Tr4 and Tr5 are OFF.
It is. Then, at the moment when the alternating current changes from the positive direction to the negative direction and crosses the zero potential, the transistor Tr2 is turned off, and the transistor Tr5 is turned on. Therefore, the charge stored in the capacitor C is discharged by this transistor Tr5, and the potential at point A drops to OV. After the zero potential crosses, when the operating voltage becomes negative, the transistors Tr3 and Tr4 turn ON and the transistor TrB turns OFF'. For this purpose, the timer circuit (
101 starts operating and charging of the capacitor C0 starts. Then, when the potential at point A reaches a predetermined voltage, the bidirectional thyristor (9) is turned on by the comparator amplifier and the bidirectional thyristor function 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 is turned off and transistor Tr5 is turned on, the charge in the capacitor co is discharged, and the potential at point A becomes Ov.
become. After the zero potential cross, when the operating voltage becomes positive, the transistor Tr2 turns on and the transistor T
r5 turns OFF. Therefore, similar operations can be repeated.

In other words, when the current transformation zero potential crosses, the capacitor C9 is discharged and the timer circuit 00) does not operate, and the operating voltage after the zero potential cross causes the transistor Tr2 or T
When r3 turns on and transistor Tr5 turns off, the timer circuit [0] operates and the capacitor C
When charging of 0 is started and the potential at point A reaches a predetermined value, the bidirectional thyristor (9) is turned on. The charging cycle of capacitor C9 is determined by variable resistor VR,
Varies depending on the DC output voltage.

Here, Resistance Island. , R1, does not fall below the set voltage even if the variable resistor VR, is slid in the lowest input direction, so the electric blower (8) will not stop.

Therefore, at the lowest input of variable resistor vR1, the electric blower (
8) The reference voltage is set by adjusting the variable resistor VL% so that it is driven by the setting input.

Problems with the background technology However, in our country, for example, the AC power source is 50H.
There are two types of power supply frequencies, z and 608z, and the variable resistor VR is adjusted for 50Hz and 60H2, respectively, so it is necessary to differentiate between them during mass production, and product management is also required. It's a hassle,
There are problems such as if the product is sold in the wrong power frequency region, it may become unusable.

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 resistors that generate respective reference voltages that are set as setting inputs at the setting positions of the operating section when using an AC power supply for each of two types of power supply frequencies that may be used. is provided in the reference voltage generation circuit and switched by a switch, so that it can be used in any region with a power supply frequency.

Examples of the invention An embodiment of the present invention will be described based on 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, a resistor VR is connected in parallel with a resistor V island, and both resistors VR, , VR.

This device is equipped with a switch that selects and inputs the reference voltage to the single power terminal on the comparator amplifier side.
2 and VR are each considered to be appropriate values.

That is, the resistance VR, is 5011 as the AC power supply (7).
The resistor VR, which is set to generate a reference voltage set to be the setting input at the setting position of the operation unit (5) when using the power supply frequency z.
is similarly set when using an AC power source (7) with a power frequency of 60 Hz.

Therefore, in the 50Hz region, sufficient performance can be achieved by switching the switch α8 to the resistor VB2 side, and in the 60H2 region, sufficient performance can be achieved by switching the switch α8 to the resistor VR side. After all, it can be used under appropriate conditions in any power supply frequency region. In this case, since the frequency-dependent performance is guaranteed using the constant voltage reference voltage of the comparator amplifier, the range of variation in adjustment can be narrowed.

Effects of the Invention Since the present invention is constructed as described above, it can be used in an appropriate state even if the power supply frequency differs. Therefore, the range of variation in adjustment can be narrowed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional example, FIG. 2 is a circuit diagram thereof, and FIG. 3 is a circuit diagram showing an embodiment of the present invention. 5 operation unit, 7 AC power supply, 8... electric blower, 9...
・Bidirectional SIRISK, 11・Comparison amplifier, 13 Reference voltage generation circuit, 18 Switch, ELL capacitor, V bird ~ ■R5...Resistance applicant Tokyo'Sekiki Co., Ltd.

Claims (1)

[Claims] An electric blower and a bidirectional SIRISC are connected in series to an AC power source, and charging starts from the time the zero potential of the AC power source is detected, and the charging cycle changes according to the DC output voltage obtained by operating the operation unit. Can be used in a device in which a capacitor is provided and a comparator amplifier is connected to the gate of the bidirectional thyristor to determine the trigger phase angle of the bidirectional thyristor by comparing the charging voltage of the capacitor with the reference voltage of the reference voltage generation circuit. In order to use AC power supplies with two types of power supply frequencies, two types of resistors are provided in the comparison voltage generation circuit to generate respective reference voltages set at the setting positions of the sea control section to serve as the setting inputs. An electric blower input control circuit characterized by being provided with a switch that selects and switches these resistors according to the frequency.