JPS60150724A - Input control circuit of electromotive blower - 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 THE INVENTION The present invention relates to an electric blower input control circuit for 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 collecting 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 operating section 5 and a display section 6. Figure 2 shows the circuit configuration, and basically AC 50/60Hzl.
An electric blower 8 and a bidirectional thyristor 9 forming a control circuit are connected in series to an AC power source 7 of the OOV. A timer circuit 10 is connected to the gate of the bidirectional thyristor 9. This timer circuit 10 includes an integrating circuit including resistors R27, R2g, and a capacitor C19.
It mainly consists of a comparator amplifier IC24 and a bidirectional xyriter 11, and also includes resistors R31 and R32, and resistors R2U and R3 that form a reference voltage generation circuit.

[I, V R, 4
It is composed of: Here, the input from the variable resistor V R1, which is changed by operating the operation unit 5, is the resistor R27.
given to. A DC output voltage is supplied to such a timer circuit 10, and therefore, the AC power supply 7
A remote control circuit 16 is connected to. In other words, Zener diode ZDIX! The 15V line is secured by the Zener diode ZD12, and the 7.5V line is secured by the Zener diode ZD12.Resistors R12 to R19, diode D11, capacitor C12/-C17,1-transistor Trti, unidirectional thyristor 5CRz , a hand switch 12. R12 is a current limiting resistor, R13°R14 is an Ichikawa resistor to prevent electric shock, Ri5 is a collector current limiting resistor, T<, ill is a protective resistor to gate 1, and RIT, R1B, and R19 are bleeder resistors. A zero cross detection circuit 17 is connected to the timer circuit 10. The zero cross detection circuit 17 mainly includes a transistor Tzw −”]”r+5, and resistors R22, R23R;! Including et al. Here, the transistor Tr15 is connected in parallel to the capacitor C19. Furthermore, the voltage dividing resistors R22 and R23 are 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 by the action of the integrating circuit. At this time, the reference voltage of the comparison amplifier IC24 is set by the resistors R29, VR, 4, and R2O, and when the potential at point A becomes higher than this reference voltage, the output of the comparison amplifier IC24 becomes H level. As a result, a current flows to the gate of the bidirectional thyristor 11 in the previous stage, and this bidirectional thyristor 11 becomes ONL.
, whereby the bidirectional thyristor 9 is gate triggered and turned on. Here, the set value (reference voltage) of one terminal of the comparator amplifier TC24 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 made conductive. 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. ↑, in the positive direction of AC, transistor T r
12 is ONL, transistor T r 13 is OFF
becomes. Therefore, transistor Tr14. Trl
rr 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 1
．． 2 is turned off and the transistor ``r15'' is turned on. Therefore, the electric charge charged in the capacitor C1!( is discharged by this transistor ``l''r+5, and the potential at point A drops to 0■. Then, after the zero potential cross, when the operating voltage is reached in the negative direction, the transistor Tr
z3. Tru is ON and 1~Rangistaft 1” r l
! l) becomes OFF. As a result, the timer circuit 10 starts operating and charging of the capacitor C]≦3 is started. Then, when the potential at point A reaches a predetermined voltage, the comparison amplifier IC2
4. Due to the action of the bidirectional thyristor 11, the bidirectional thyristor 1.1 star 9 is turned 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 Tt
+3. Trt4 turns off and transistor T r
t5 is turned on, the charge in the capacitor CI9 is discharged, and the potential at point A becomes O■. Then, after the zero potential cross, when the operating voltage is reached in the positive direction, the transistor T r 1
2 turns on and transistor Tr+S turns off. Therefore, similar operations are repeated. That is, when the AC zero potential crosses, the capacitor C19 is discharged and the timer circuit 10 does not operate, and at the operating voltage after the zero potential cross, the 1-transistor T r 12 or T r 1.3 turns on and the 1 -Ransistor Tr1
5 is turned off, the operation of the timer circuit 10, that is, charging of the capacitor C19 is started, and when the potential at point A reaches a predetermined value, the bidirectional thyritor 9 is turned on. The operation part 5 is the output from the sensor (automatic) with the switch SW.
- and output from variable resistor VR1 (manual). The sensor section 13 operates by detecting the magnitude of wind force 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 Hall element TC3 is used. That is, a magnet is placed on the flap side, and a Hall element IC3 is placed on the opposite fixed side to detect changes in the magnetic field. Here, output is taken out from pins 2 and 4 of the Hall element TC3, and a constant current is supplied from pins 1 and 3. Further, the operational amplifier TC21 constitutes a constant current power source for driving the Hall element TC3 with a constant current. And operational amplifier I
C22, IC, and 23 constitute a sensor signal amplifier, which goes up to the first stage IC22, performs differential amplification, and then goes to the next stage I
C23 performs offset adjustment and gain adjustment, and the output is given to the sensor output terminal of the switch SW of the operation section 5. Here, the gain is variable resistor V R3
It is set so that it decreases as the slider moves toward the output side of the IC 23, and increases toward the ground. Further, the variable resistor VR2 for offset adjustment corrects variations in IC3. Further, the first display circuit 14 includes LEDs D+ and D as light emitting elements.
2. D3. It is formed by connecting D4 in series, and resistors R1~
Under the comparison voltage source by R4, the comparison amplifier ICII, IC
12, lighting is controlled by TC13. Here, the LED
Dt is always lit and also serves as a pilot. or,
The outputs of the comparison amplifiers TCI1 to TC13 are open collectors, and each switching causes the LEDs Dt to D4 to blink, and is connected to the connection point of each of the LEDs D1 to D4. Each comparator amplifier ICI
+~fc13 has a transistor inside,
It is an open collector. Here, power is supplied to the LED through resistors R7 and RL, and the resistor RL is set to constitute a constant current circuit, so the LED to be lit is Regardless of the number, the brightness remains almost the same. Multiple CEIs like this
] Therefore, the display is automatically proportional to the movement of the flap. Problems with the conventional technology In such a conventional system, the electric blower 8 has a 0N-
The OFF control is performed by the hand switch 12 of the remote control circuit 16, and for this purpose, the transistor Tru
The electric blower 8 is stopped by stopping the operation of the subsequent control circuit using a remote control circuit 16 including a control element such as a thyristor 5CR1. In other words, extra circuits and circuit elements are required for the remote control for turning on and off the electric blower 8, making the system complicated. Purpose of the Invention The present invention has been made in view of the above points, and provides an electric blower input control circuit that can smoothly perform ON-OFF control of an electric blower with a simple circuit configuration that eliminates the need for a remote control circuit. The purpose is to obtain. Summary of the Invention The present invention provides a hand switch via a resistor in a part of a circuit that supplies charging current to a capacitor, and short-circuits and opens the hand switch, and conducts and cuts off the supply current. The structure is such that the electric blower can be turned on and off immediately. Embodiment of the Invention An embodiment of the invention will be explained in b) 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 hand switch 18 is provided through a resistor Ra in the circuit in which the DC 8z voltage from the variable resistor VR1 of the operating section 5 is applied to the capacitor Cts in FIG. Hand switch 1
Resistors Ra and R27 connected in series with 8 limit the current and provide electric shock protection 11-. According to such a configuration, when the hand switch 8 is short-circuited, the DC output voltage from the operation unit 5 is supplied to the capacitor 5 while securing the 7.5V line and 15V line to the control circuit. Therefore, the electric blower 8 is turned on as explained in FIG. 2. On the other hand, when the hand switch 18 is opened, the supply of DC output voltage from the operating section 5 to the capacitor C1!1 is cut off. Therefore, the timer circuit 10 of the capacitor CI9 etc. is not activated and the electric blower 8 is turned off. In this way, the hand switch 18 is provided in a part of the charging circuit for the capacitor C1!1 to turn off the electric blower. Turn on 8.
○FFL is available, as shown in Fig. 2. This eliminates the need for the 1J control circuit 16 equipped with the thyristor SCR1 and the like, resulting in a simple circuit configuration. In addition, according to the second national power formula, when the power source is driven when the hand switch 18 is 0N-OFF, the power supply smoothing capacitor etc. is charged before operation, which causes a time lag between ON and OFF. According to the example, it is possible to turn on and off the screen without worrying about such a time difference.
FF can be used without causing discomfort to the user. Effects of the Invention The present invention is capable of charging a capacitor in a two-way manner. l
Since a hand switch is provided in a part of the i-circuit, there is no need for a remote control circuit with control elements such as transistors and thyristors, and the simple circuit configuration allows smooth operation without any time lag. It is possible to turn the blower on and off.

[Brief explanation of drawings]

FIG. 1 is an external 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. S Operation unit, 7. AC power supply, 8. Electric blower, 0.
Both sides are useful, 18...Hand switch, C19.
...Capacitor, Ra...resistance request person Tokyo Electric Co., Ltd. public use 1゛object...:・1

Claims (1)

[Claims] A capacitor in which an electric blower and a bidirectional thyristor are connected in series to an AC power source, and charging starts when 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. and a comparator amplifier that compares the charging voltage of the capacitor with the reference voltage of the reference voltage generation circuit to determine the trigger phase angle of the bidirectional thyristor is connected to the gate 1 of the bidirectional thyristor. A hand switch is provided in a part of the circuit that supplies a charging current to the capacitor from the DC output voltage of the part through a resistor, and the electric blower is turned on and off by conducting or cutting off the supply current by shorting or opening the hand switch.
An electric blower input control circuit characterized in that: