JPH0121976B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a remote control device for a vacuum cleaner used in general households.

Conventional configuration and its problems Conventionally, in this type of vacuum cleaner, the electric blower phase control device is installed inside the main body 1, as shown in Fig. 1, and the power consumption control device installed on the top surface of the main body 1 is installed. The suction force was set by changing the changeover switch 2. Furthermore, the remote control switch at the end of the hose only has the function of starting and stopping the electric blower, so in order to change the power consumption, it is necessary to use the switch 2 on the main body 1.
The disadvantage was that it was difficult to use because it required manual operation.

Purpose of the invention The present invention solves the conventional problems as described above,
Remote control (hereinafter referred to as remote control)
The present invention provides a vacuum cleaner with improved usability by configuring the input of an electric blower to be freely changeable using a switch.

Structure of the Invention The present invention connects a remote control switch at the end of a hose to the secondary side of an isolation transformer, and connects a logic circuit to the primary side to output a logic level pulse signal in response to changes in the primary current. , the pulse signal from the logic circuit is input to an analog multiplexer via a counter, and the value of the reference voltage generator is selected and output.
Furthermore, a comparator compares the output of the analog multiplexer with a triangular wave synchronized with the power supply, and a pulse obtained by differentiating the output of this comparator is applied to the base of a transistor, which drives a bidirectional thyristor through this transistor. Now you can control the power of. Therefore, by turning on and off the remote control switch at the end of the hose, an electrical pulse signal is generated, and the pulse signal operates a counter in the control circuit installed inside the vacuum cleaner body, and the control circuit operates according to the digital output of the counter. The power consumption of the electric blower can be switched by

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 2 shows a block diagram of the present invention, in which an electric blower 3 and a bidirectional thyristor 4 are connected in series to an AC power source. moreover,
One end of the primary winding of an isolation transformer 5 is connected to one side of the AC power source, and the other end is connected to the AC power source via a resistor 6. A remote control switch 7 at the end of the hose is connected to the secondary side of the isolation transformer. A rectifier circuit 8 is connected to both ends of the resistor 6 to constitute a primary current detection section. When the remote control switch 7 is turned on, the primary current of the isolation transformer 5 increases, the potential across the resistor 6 rises, and the output VA of the rectifier circuit 8 rises in terms of direct current.
The voltage level detection circuit 9 detects whether VA is higher or lower than a certain set voltage, and converts it into a logic level such that when it is high, it becomes L, and when it is low, it becomes H. 10 is an integrating circuit, and 11 is a shot trigger circuit, which is a chattering prevention circuit. 12
is a filter circuit, which is connected to the clock input terminal of the counter 13 via the filter circuit 12. That is, each time the remote control switch is turned ON, one logic level pulse signal is input to the clock input terminal of the counter 13,
3. Count the number of pulses. Further, a binary coded digital signal is generated from the output of the counter 13 and is applied to the input of the analog multiplexer 14 at the next stage. Here, the analog multiplexer 14 receives the binary code digital signal,
The value of the reference voltage generator 15 is selected and output. Its output is connected to the inverting terminal of the comparator 16, and a triangular wave synchronized with the AC power source is applied to the non-inverting terminal. The output VE of the comparator 16 generates a pulse that becomes L when the reference voltage is higher than the potential of the triangular wave, and becomes H in the opposite case.
7 to differentiate the pulse and switch transistor 18. When the transistor 18 receives the differential pulse, it turns on, and a pulse is sent from the DC power source to the gate of the bidirectional thyristor 4 through the resistor 19, turning on the bidirectional thyristor and energizing the electric blower. If you prepare a large number of reference voltages, the timing at which they cross with the triangular wave will change.
The timing of the gate pulse also changes, the conduction angle of the electric blower changes, and the power control becomes movable.

FIG. 3 shows a specific circuit. An electric blower 3 and a bidirectional thyristor 4 are connected in series to the AC power source, and a series circuit of the primary winding of an isolation transformer 5 and a resistor 6 is connected to both ends of the AC power source. It is connected to a remote control switch 7 via a hose. Diode 2 for resistor 6
A rectifier circuit 8 shown in FIG. Resistor 22 is capacitor 2
1 discharge resistance. Here, remote control switch 7
When turned on, VA will be as shown in Figure 4 A ()
Changes from to (). By connecting the Zener diode 23 to one end of the capacitor 21 and to the base of the transistor 25 via the resistor 24, when VA becomes equal to or higher than the Zener voltage VZ of the Zener diode 23, the transistor 25
is configured so that it is turned on. The resistor 26 is
A resistor to stabilize the transistor.
A collector resistor 27 is connected between the collector and the DC power supply.

Here, when the remote control switch is OFF, the transistor 25 is cut off and the collector potential
VB is at the DC power level and is in an H state, and when the recon switch is turned on, the transistor 25 is turned on and the collector potential VB becomes L.
This situation is shown in Figure 4B. However, noise pulses are superimposed on the waveform of the collector potential due to chattering of the remote control switch, back electromotive force of the isolation transformer, and the like. Therefore, the collector output of the transistor 25 is connected to an integrating circuit composed of a resistor 28 and a capacitor 29 and a waveform shaping Schmitt trigger circuit. Further, the Schmitt trigger circuit includes two inverters 30 and 31 connected in series, and resistors 32 and 33 that determine the width of hysteresis. The output VC of the Schmitt trigger circuit is shown in Figure 4C. Further, an inverter 34 is connected to the Schmitt output to invert the waveform and apply it to the clock input terminal of the counter 13. However, since spike-like pulse noise cannot be removed using only an integrating circuit and a Schmitt trigger circuit,
A filter consisting of a resistor 36 and a capacitor 37 is inserted before the clock terminal.

With the above circuit configuration, the pulse output in conjunction with the remote control switch 7 is input to the counter 13, and the counter 13 reliably counts at the rising edge of the clock pulse. This clock pulse
VD is shown in Figure 4D. Furthermore, the output of the counter 13 is input in binary code to the analog multiplexer 14 at the next stage, and is converted into a reference voltage V1 to V determined by dividing the resistors 38 to 41 according to the digital input.
3 is applied to the inverting input terminal of switching comparator 16. Further, a triangular wave VG synchronized with the power supply waveform VH is applied to the non-inverting terminal. This situation is shown in Figure 5 A and B. Also, the output VE of the comparator 16 is
The triangular wave VG and the reference voltages V1 to V3 are compared in magnitude, and when the triangular wave potential VG exceeds the reference voltages V1 to V3, an H output is obtained, and when it is low, an L output is obtained. This situation is shown in Figure 5 C and D. V3 when the reference voltage is low
Because the timing of crossing with the triangular wave is early,
If a pulse with a wide pulse width is obtained and the reference voltage is high, the pulse width will be shortened. Here, the output VE of the comparator 16 is differentiated by a differentiating circuit consisting of a series circuit of a capacitor 42 and a resistor 43, and
It is added to the base of 8. The state of this base voltage waveform VF is shown in Fig. 5 E and F.

When the differential pulse VF is applied to the base of the transistor 18, the transistor is turned on, and a gate pulse is applied from the DC power supply to the gate of the bidirectional thyristor 4 through the resistor 19, and the bidirectional thyristor is turned on.
It turns on and the electric blower 3 is energized.

According to the above circuit configuration, by switching the reference voltages V1 to V3 using the analog multiplexer 14, the supply timing of the gate pulse to the bidirectional thyristor 4 is changed, and power control becomes possible. In other words, the power consumption of V3, which has a low reference voltage, and the electric blower are high, and the absorption power is strong (Figure 6 B).
Control is performed so that the reference voltage V1 is high, the power consumption is low, and the suction force is weak (FIG. 6 d).

Effects of the Invention According to the present invention, the remote control switch is turned on and off.
Since the electric blower's power consumption can be switched in multiple stages simply by turning it off, it not only greatly improves usability, but also can be used for input position display and a wide variety of other controls. Furthermore, since an isolation transformer is used, there is no danger of electric shock in the remote control switch, making it safe.
In addition, the remote control switch has a simple configuration, and the hand portion is compact and lightweight, which not only improves usability but also improves reliability.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a vacuum cleaner showing a conventional embodiment;
Fig. 2 is a block diagram of a control circuit as an embodiment of the present invention, Fig. 3 is a diagram of the same control circuit, Figs. 4 and 5 are waveform diagrams at various parts of the control circuit, and Fig. 6 is a phase control of the present invention. It is an explanatory diagram showing a method. 5... Isolation transformer, 6, 8... Primary current detection section, 9... Logic level conversion circuit, 10, 11...
Anti-chattering circuit.

Claims (1)

[Claims] 1 Connect the remote control switch at the end of the hose to the secondary side of the isolation transformer, and connect a logic circuit to the primary side that outputs a logic level pulse signal according to changes in the primary current, and connect the The pulse signal is input to an analog multiplexer via a counter, and the value of the reference voltage generator is selected and output.The output of the analog multiplexer is compared with a triangular wave synchronized with the power supply by a comparator. A vacuum cleaner remote control device that applies a pulse that differentiates the output of