JPH0697872B2 - Vacuum cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an electric vacuum cleaner, and a hose in which the output of an electric blower for dust collection built in the main body of the vacuum cleaner is connected to the main body of the vacuum cleaner. Connection device that can be switched by a manual operation unit of the above.

(Prior Art) A circuit inside a main body of a conventional vacuum cleaner will be described with reference to FIG.

A commercial AC power source 11 is connected in series with a triac 14 and an electric blower 15 to which a snubber circuit as a protection circuit composed of a resistor 12 and a capacitor 13 is connected.
Reference numeral 15 has a noise prevention circuit 16 formed of a capacitor.

A primary winding of a step-down transformer 20 is connected to the commercial AC power supply 11, and a rectifier circuit 21 composed of a diode bridge is connected to a secondary winding of the transformer 20, and an output side of the rectifier circuit 21. A constant voltage circuit including a resistor 22 and a Zener diode 23 is connected to the. This Zener diode 23
A resistor 24 and a resistor 25 connected in series in parallel with the
The gate of the unijunction transistor (PUT) 26 is connected, and the cathode of this PUT 26 is connected to one end of the primary winding of the transformer 27. A capacitor 28 for charging is placed between the anode of the PUT 26 and the other end of the primary winding of the transformer 27.
Are connected. A resistor 29 and a diode 30 are connected to the secondary winding of the transformer 27 and are connected to the gate of the triac 14.

And at the connection point between the resistor 22 and the resistor 24, the resistor 31, the PUT2
A resistor 32 is connected to the anode of 6, and the resistor 31 and the resistor 32 are connected to an operating circuit 33 in the hose through a piano wire in the hose.

The operation circuit 33 includes a sliding variable resistor 35 having an insulating portion 34,
It has a resistor 36 and a semi-fixed resistor 37 for adjustment.

Next, the operation of the circuit of this conventional vacuum cleaner will be described. First, the slidable resistance 35 is adjusted to the resistance value corresponding to the output of the vacuum cleaner. And when this resistance value increases,
The PUT 26, which turns on when the anode potential exceeds the gate voltage set by the resistors 24 and 25, increases the charging time of the capacitor 28, so the phase control angle of the trigger of the triac 14 becomes large and the electric blower The power supplied to 15 decreases, and the output of the electric blower 15 decreases. On the contrary, when the resistance value of the sliding variable resistor 35 becomes small, the charging time of the capacitor 28 becomes short, so that the trigger phase control angle of the triac 14 becomes small and the output of the electric blower 15 increases.

In this way, the output of the electric blower 15 is controlled by changing the resistance value of the continuous sliding variable resistor 35.

(Problems to be solved by the invention) However, since the operation circuit 33 for controlling the current charging the capacitor 28 is arranged in the hand of the hose that is easy to operate, the contact portion between the vacuum cleaner body and the hose Electrical contact failure may occur at the rotating and sliding parts of the hose inside the cleaner body, resulting in intermittent charging. In particular, it appears remarkably due to grease for preventing wear of sliding parts, seams of rings, wear of contact parts due to aged deterioration, and rapid rotation of contact pieces.

When the capacitor 28 is thus intermittently charged, the charging cycle of the capacitor 28 changes, and the output of the electric blower 15 becomes unstable. That is, the total contact time including the contact disconnection time is one cycle, and the total intermittent time in one cycle is the fluctuation range. Therefore, one cycle time is different, the phase angle is shifted, and the output is changed. Of.

The present invention has been made in view of the above problems, and an object thereof is to provide an electric vacuum cleaner having a stable output of an electric blower.

[Structure of Invention]

(Means for Solving the Problems) An electric blower of the present invention has a dust collecting section and an electric blower built-in, and an electric vacuum cleaner main body provided with a control circuit for controlling the electric air blower, and detachable from the electric vacuum cleaner main body. A hose having an operation circuit for freely changing the resistance value for changing the output of the electric blower, which is freely connected to the hand operation unit, and the control circuit includes a power supply synchronous rectification circuit for rectifying an alternating current and this power supply synchronization. A charging circuit that is charged by a rectifier circuit, a trigger circuit that triggers according to the charging voltage of this charging circuit, and a power control circuit that controls the output of the electric blower by the output of this trigger circuit, and the trigger circuit,
The trigger voltage can be variably set, a trigger voltage setting circuit that sets the trigger voltage of this trigger element, and a trigger output circuit that outputs a trigger by the trigger of the trigger element. A trigger voltage setting terminal is provided between the power input side and the circuit ground side terminal, and is connected between the trigger voltage setting terminal and the circuit ground side terminal, and the resistance value of the operation circuit is stored and stored for a certain period. A resistance lower peak detection circuit that outputs a resistance value, and a resistance value open count output circuit that outputs the open degree of the resistance value to the resistance lower peak detection circuit, the resistance lower peak detection circuit and the resistance value open count output circuit It connects to the operation circuit and changes the storage time of the resistance lower peak detection circuit according to the output of the resistance value open count output circuit. That.

(Operation) The present invention controls the output of the electric blower by controlling the electric power from the power supply with the control circuit of the electric vacuum cleaner body.
In the control circuit, the power supply synchronous rectification circuit rectifies the alternating current to charge the charging circuit. When the voltage charged in the charging circuit exceeds the voltage of the trigger voltage setting circuit of the trigger circuit, the trigger element triggers, and the trigger output circuit controls the phase of the power control circuit.

In addition, the voltage of the trigger voltage setting circuit varies the resistance value of the operation circuit arranged in the hand operation part of the hose, and the resistance value of this operation circuit is stored in the resistance lower peak detection circuit. Output according to the degree of opening of the resistance value, and the time corresponding to this output is set by the stored resistance value.

(Embodiment) An embodiment of the electric vacuum cleaner of the present invention will be described below with reference to the drawings.

In FIG. 5 and FIG. 6, 40 is a vacuum cleaner body,
It comprises a main body case 42 having an opening 41 formed in the front upper part thereof, and a lid body 43 having a rear end portion axially attached to the main body case 42 to open and close the opening 41. Further, the main body case 42,
It is composed of a lower body case member 44 and an upper body case member 45 coupled and fixed to the upper side of the lower body case member 44, and has a front handle 46 at the front part of the body case 42. A cover body 47 is pivotally attached to the rear upper part of the rear side so as to be openable and closable. A component storage portion 48 is provided inside the cover body 47, a hanging hole 49 and a round brush 50 are stored therein, and the cover body 47 is locked by a locking piece 51. Further, a display window 53 of an indicator 52 showing the suction capacity is arranged on the front side of the component storage section 48. Further, a bumper 54 is held on the peripheral surface of the main body case 42 by the main body case members 44 and 45.

Then, the inside of the main body case 42 is divided into front and rear by a partition wall 56 formed in a substantially central portion thereof and having a communication port 55, and an electric blower is provided in a space portion behind the partition wall 56.
57 is provided and is protected and fixed by an elastic member 58. Further, a circuit board 59 is provided above the electric blower 57. A space portion in front of the partition wall 56 serves as a dust collecting portion 60 having the opening 41 on the upper surface and located on the negative pressure side of the electric blower 57. Further, an exhaust port 61 is formed on the rear surface of the main body case 42 so as to communicate with the pressure boosting side of the electric blower 57. A cord reel 63, which is located behind the electric blower 57 and accommodates the power cord 62, is rotatably provided inside the main body case 42. This cord reel 63 has an opening for the button of the cover body 47.
The power cord 62 is wound by pressing the cord reel button 65 protruding from 64. Further, a pair of wheels 66 and a turning wheel 67 are rotatably provided on the lower side of the main body case 42 on the rear side of both side surfaces and the front side of the lower surface thereof.

The lid 43 is formed in a thin box shape having an open lower surface, and a body clamp 69 urged by a spring 68 is pivotally attached to a front end portion of the lid 43. The main body clamp 69 is removably engaged with a locking portion 70 formed on the upper end of the front surface of the main body case 42 so that the lid body 43 is held in a closed state. . A handle 71 is rotatably housed near the joint between the lid 43 and the body case 42.

The front side of the upper surface of the lid 43 is formed as an inclined surface 72 that descends toward the front, and a circular opening 73 is formed in the inclined surface 72. An inner wall 74 is joined and fixed to the lower surface side of the lid body 43 substantially parallel to the upper surface of the lid body 43, and a substantially cylindrical support body 75 is provided between the inclined surface 72 and the inner wall 74. Is fixed.

A rotating body 76 is located between the inclined surface 72 and the inner wall 74 and is rotatably supported by the support body 75. Further, on the bottom surface of the rotating body 76, for example, a pair of high-voltage terminal rings 77 for supplying power to the brush motor are fixed.
These high-voltage terminal rings 77 are slidably in contact with a pair of contacts 78 fixed to the inner wall 74. On the other hand, on the outer peripheral surface of the rotating body 76, a pair of low-voltage terminal rings 79 are fixed side by side in the axial direction,
These low-voltage terminal rings 79 are slidably controlled by a pair of contacts fixed to the support body 75 or the like.

Further, a lid 82 that is opened by inserting the main body connecting portion 81 of the hose 80 is pivotally attached to the rotating body 76. Further, a flexible sliding cover body 83 for opening and closing the opening 73 is slidably housed between the inclined surface 72 of the lid body 43 and the rotating body 76.

The hose 80 can be inserted into and removed from the electric vacuum cleaner body 40, and the base end of a flexible hose body 84 having an electric supply line and a transmission line is attached to the main body connecting portion 81.
In addition, when the hose 80 is connected, the power supply line is electrically connected to the pair of high voltage terminal rings 77, and the transmission line is electrically connected to the pair of low voltage terminal rings 79.

Further, at the tip of the hose body 84, a grip tube 86 to which an extendable extension tube 85 is inserted and connected so as to be freely inserted and removed is provided, and a hand operation section 87 is provided at the grip tube 86. And
As shown in FIGS. 7 and 8, the hand operation section 87 is provided on a grip tube 86 composed of a cover tube 88 and a connection tube 89 connected to the hose body 84, and the condition of the surface to be cleaned is shown. The display plate 90 is provided with a cursor 91 that follows the variable sliding resistance and is fixed by a cover body 92. In addition, extension pipe 85
A connection pipe 94 for the suction port body 93, which has a built-in brush electric motor inside, is detachably attached, and the suction port body 93, the vine 49, and the round brush 50 can be selectively exchanged and used. ing.

Next, the circuit of the above embodiment will be described.

In FIG. 1, 101 is a commercial AC power supply, and this commercial AC power supply 101 is controlled by the electric blower 57 via a control circuit 102 that controls the output of the electric blower 57. This control circuit 10
2 is connected to the commercial AC power supply 101, and this commercial AC power supply 10
The charging circuit 103 and the trigger circuit 105 are connected in cascade to a power supply synchronous rectification circuit 104 that steps down and rectifies the current of 1 and resets the charging of the charging circuit 103. This trigger circuit 1
Reference numeral 05 denotes the trigger element 106 that triggers by the charging voltage of the charging circuit 103, and the resistance value of the operation circuit 107 provided in the manual operation unit 87, and the output of the resistance value open count output circuit 108 that outputs the degree of opening of this resistance value. A resistance lower peak detection circuit 10 that stores the time corresponding to the above and outputs the stored resistance value for that time.
It has a trigger voltage setting circuit 110 for setting the trigger element of the trigger element 106 having 9 and a trigger output circuit 111 for outputting the output of the trigger element 106. The trigger output circuit 111 is connected to the power control circuit 112, and the power control circuit 112 controls the output of the electric blower 57 by the output of the trigger output circuit 111.

Further, the resistance value open count output circuit 108 and the resistance lower peak detection circuit 109 are connected to the operation circuit 107 provided in the manual operation section 87, and the resistance value open count output circuit 108.
Outputs the opening degree of the resistance value, and the resistance value of the operation circuit 107 is stored in the resistance lower peak detection circuit 109 for a time corresponding to the output of the resistance value open frequency output circuit 108, and the set voltage of the trigger voltage setting circuit 110 is changed. .

Next, an example of a specific circuit will be described.

A commercial AC power supply 101, via a fuse 115, a triac 119 as a power control element having a snubber circuit 118 for surge prevention, which includes a capacitor 116 and a resistor 117 connected in series, and an electric blower 57 are connected in series. There is.

Further, the electric blower 57 has a noise prevention circuit 124 for preventing noise, which is composed of capacitors 121, 122, 123. The capacitors 121, 122, 123 are commercial AC power supply 101 and fuses.
115 is connected to the electric blower 57 and the electric blower 57.

Further, a primary winding 126 of a step-down transformer 125 is connected to both ends of the commercial AC power supply 101 via a fuse 115, and a secondary winding 127 of this transformer 125 has a rectifying diode composed of diodes 128, 129, 130, 131. The bridge 132 is connected. A resistor 133 and a Zener diode 134 are connected from the positive side to the negative side of the diode bridge 132. A resistor 135 and a charging capacitor 136 connected in series, and a resistor 137 and a resistor 138 connected in series are connected in parallel to the Zener diode 134. This resistance
The resistance value of 138 is as high as about 10 to 20 times the combined resistance value of the operation circuit 107. Then, from the positive side to the negative side of the diode bridge 132, the reverse diode 14
1, a resistor 142, a zener diode 143 for constant voltage connected in parallel, and a smoothing capacitor 144 are connected in series. The + B terminal of the resistance value open count output circuit 108 and the resistance lower peak detection circuit 109 is connected to the connection point of the resistor 142, the capacitor 144, and the Zener diode 143, and the E terminal of each is connected to the negative side of the diode bridge 132. The input terminal of the resistance value open frequency output circuit 108 is connected to the trigger voltage setting terminal 145, and the output terminal is connected to the resistance lower peak detection circuit 109. The resistance setting input terminal of the resistance lower peak detection circuit 109 is the trigger voltage setting terminal 145, the storage time setting input terminal is the resistance value open frequency output circuit 108, and the resistance value setting output terminal is the resistance 137 on the setting power supply input side. It is connected between the circuit ground side terminal 146 and the resistor 138.

Further, the resistance value open frequency output circuit 108 uses the open degree of the resistance value of the operation circuit 107 as a voltage to detect the resistance lower peak detection circuit.
Output to 109. The resistance lower peak detection circuit 109 determines the lowest resistance value of the operation circuit 107 as the resistance value open count output circuit 1
The time corresponding to the output of 08 is stored, and the stored minimum resistance value for each time is output to the trigger voltage setting circuit 110.

The resistance value open count output circuit 108 has a structure as shown in FIG.

It is grounded via a resistor 151 and a resistor 152 connected in series from the positive electrode + B. Reference numeral 153 is a comparator which compares the comparison voltage with the input voltage and outputs one pulse when the comparison voltage becomes high, and is set so that the comparison voltage becomes high when the resistance value is opened and becomes high. The + B terminal of the comparator 153 is the positive electrode + B, the input terminal is the trigger voltage setting terminal 145,
The comparison voltage terminal Ref is connected to the connection point of the resistors 151 and 152, and the comparison voltage is set by the resistors 151 and 152. The E terminal is grounded, and the output terminal is connected to the input terminal of the frequency-voltage converter (fV converter) 154. The frequency-voltage converter 154 converts the number of pulses into a voltage. The larger the number of pulses, the higher the output voltage, and the smaller the number of pulses, the lower the output voltage. This frequency-voltage converter 15
The + B terminal of 4 is connected to the positive electrode, the E terminal is grounded, and the two output terminals are connected to the resistance lower peak detection circuit 109, respectively.

The resistance lower peak detection circuit 109 has a structure as shown in the block diagram of FIG.

The detection circuit 155 detects the resistance value set by the operation circuit 107, and the hold circuit 156 holds the minimum value of the detected resistance value. Then, the held value is canceled by the reset circuit 157 every cycle set by the output of the resistance value open count output circuit 108. Further, the value of the hold circuit 156 is set by the output circuit 158 to the trigger voltage setting circuit 110.
Is output to.

Further, a specific circuit of the resistance lower peak detection circuit 109 will be described with reference to FIG.

The input terminal of the operational amplifier 161 is connected to the setting input terminal,
One end of the operational amplifier 161 for the reference voltage is connected to the power supply 162 and the other end is grounded. The output terminal of the operational amplifier 161 is connected to a capacitor 163 whose one end that holds the lowest resistance value of the operation circuit 107 as a voltage is grounded, and the emitter for canceling the voltage of this capacitor 163 is grounded and is connected to the base. The collector of the transistor 164 to which the reset circuit 157 is connected is connected, and further the input terminal of the operational amplifier 165 is connected. The output terminal of the resistance value open count output circuit 108 is connected to the input terminal of the reset circuit 157, and the reset cycle is changed by the output of the resistance value open count output circuit 108. The output terminal of the operational amplifier 165 is connected to the base of the output transistor 166, the collector is set to the setting output terminal, and the emitter of the transistor 166 is grounded.

The anode of the programmable unijunction transistor (PUT) 106 as the trigger element is connected to the connection point of the resistor 135 and the capacitor 136, and the gate is connected to the connection point of the resistor 137 and the resistor 138. And this PUT10
The cathode of 6 is connected to the load of the diode bridge 132 via the primary winding 172 of the transformer 171 for insulation. Further, one end of the secondary winding 173 of the transformer 171 is connected to the gate of the triac 119 via a stabilization circuit 176 for preventing false ignition, which includes a resistor 174 and a diode 175, and the secondary winding 1
The other end of 73 is connected to the connection point of triac 119 and fuse 115.

A sliding resistance 181 and a resistance 182 for correcting the resistance value of the sliding resistance 181 are connected in parallel to the trigger voltage setting terminal 145, and a first conductor 183 and a second conductor 184 are connected to the tip. Has been done. Further, the circuit ground side terminal 146 has the first
Third conductor 18 shorter than second conductor 183 and second conductor 184
5 is connected. The sliding resistance 181 and the first conductor
A first slider 186 is provided between 183 to electrically connect the sliding resistance 181 and the first conductor 183, and to connect the second conductor 184 and the third conductor 183.
A second slider 187 is provided between the conductors 185 of the second conductor 185, and has an electrically open portion for turning off to electrically connect the second conductor 184 and the third conductor 185. There is. Furthermore, the first
The slider 186 and the second slider 187 of FIG.
To follow.

The operation of the above embodiment will be described.

First, when the cursor 91 of the manual operation unit 87 is slid, the first slider 186 and the second slider 187 follow the cursor 91, and the sliding resistance 181 and the first conductor 183, the second conductor 183 Conductor 184 and third conductor 185 make electrical contact. As a result, the resistance lower peak detection circuit 109 and the operation circuit 107 are electrically connected. And capacitor 13 applied to the anode of PUT 106
The charging voltage of 6 is set by varying the resistance value of the operation circuit 107, this resistance value is stored in the resistance lower peak detection circuit 109, and the resistance value stored in the resistance lower peak detection circuit 109 is used as the voltage to set the trigger voltage setting circuit 107. PUT10 set to
Since it is higher than the voltage applied to the gate of 6, PUT106
Is turned on and the electric blower 57 is driven. In the resistance lower peak detection circuit 109, the period in which the resistance value is held is changed by the output of the open count output circuit 108 according to the open degree of the resistance. Since the resistance value of the resistor 138 is very high, the set voltage is almost determined by the voltage corresponding to the resistance value of the resistance lower peak detection circuit 109.

At this time, first, the voltage of the commercial AC power supply 101 is
It is stepped down by the voltage and rectified by the diode bridge 132, and the resistor 133
Also, the zener diode 134 is used to make the voltage constant. Then, the capacitor 136 of the charging circuit 103 is charged, and this capacitor 13
When the charging voltage of 6 becomes higher than the set voltage of the trigger voltage setting circuit 110 set by the operation circuit 107 and stored and output by the resistance lower peak detection circuit 109, the PUT 106 is turned on.

Further, when the open degree of the resistance value of the operation circuit 107 is high,
Since the comparator 153 outputs a large number of pulses, the output voltage from the frequency-voltage transformer 154 becomes high, the memory holding time of the resistance lower peak detection circuit 109 becomes long, and even if the resistance value is released a lot, the motor is smoothly driven. The blower 57 is driven.

On the contrary, when the opening degree of the resistance value of the operation circuit 107 is low, the comparator 153 outputs only a few pulses, so the output voltage from the frequency-voltage converter 154 becomes low, and the memory of the resistance lower peak detection circuit 109 is reduced. The holding time becomes short, and the response of the operation of the hand operation unit 87 becomes quick. The capacitor 136 discharges in synchronization with the voltage of the power supply synchronous rectification circuit 104.

When the PUT 106 is turned on, the transformer 171 of the trigger output circuit 111 triggers the gate of the triac 119 of the power control circuit 112 to turn on the triac 119 and phase-control the power according to the angle at which the triac 119 is turned on. Control output.

When controlling the output of the electric blower 57,
The resistance value of the sliding resistance 181 is changed according to the condition of the surface to be cleaned indicated on the display plate 90 by the cursor 91 of 87.

For example, when the output of the electric blower 57 may be small like a curtain, the cursor 91 is slid to increase the resistance value of the sliding resistance 181. As a result, the resistance value stored in the resistance lower peak detection circuit 109 increases, the output voltage of the resistance lower peak detection circuit 109 increases, and the voltage applied to the resistor 137 and the resistance lower peak detection of the voltage of the resistance lower peak detection circuit 109 are detected. Since the voltage division ratio of the voltage of the circuit 109 becomes large, the voltage of the gate of the PUT106 set by the trigger voltage setting circuit 110 becomes high and the charging time to the set voltage of the capacitor 136 becomes long, so the time when the PUT106 turns on becomes slow. As a result, the phase control angle of the triac 119 also increases, and the output of the electric blower 57 decreases.

On the other hand, when a large output is required for the electric blower 57 like a carpet, the cursor 91 is slid to reduce the resistance value of the sliding resistance 181. As a result, the resistance value stored in the resistance lower peak detection circuit 109 becomes smaller, the output voltage of the resistance lower peak detection circuit 109 becomes lower, and the voltage of the resistance 137 and the resistance of the resistance lower peak detection circuit 109 Since the voltage division ratio of the lower peak detection circuit 109 becomes smaller, the PUT10 set by the trigger voltage setting circuit 110 is set.
The voltage of the gate of 6 becomes low, the charging time to the set voltage of the capacitor 136 becomes short, the time for turning on the PUT 106 becomes short, and the phase control angle of the triac 119 also becomes small, so the output of the electric blower 57 becomes large.

Further, when the cursor 91 of the manual operation unit 87 is slid to turn it off to open the second conductor 184 and the third conductor 185, the voltage of the resistance lower peak detection circuit 109 becomes very high and the resistance 1
Since the resistance value of 38 is very high, the voltage of resistance 137 and the resistance 13 of the resistance lower peak detection circuit 109 and resistance 138
The voltage division ratio of 8 becomes very high, the gate voltage of the PUT 106 set by the trigger voltage setting circuit 110 becomes much higher than the charging voltage of the capacitor 136, the trigger element 106 is not turned on, and the triac 119 is not turned on. 57 does not drive.

When the hose 80 is removed from the vacuum cleaner body 40, or when the trigger voltage setting terminal 145 and the circuit grounding side terminal 1
Similarly, the electric blower 57 is not driven even when at least one of 46 and 46 is opened.

According to the above-described embodiment, the resistance lower peak detection circuit 109 stores the minimum value of the resistance value set by the operation circuit 107 by the resistance value open count output circuit 108 while storing and outputting it for a period corresponding to the opening degree. Even if a high resistance value is momentarily displayed due to the intermittent opening of 107, the gate voltage of the PUT 106 can be made constant by outputting the lowest resistance value stored in the resistance lower peak detection circuit 109 for the above period. The time for turning on is constant, the control phase angle is constant, and the output of the electric blower 57 can be stably driven. In addition, the resistance lower peak detection circuit 109 can be set as long as it is in contact with 1 μS or less during the above period. Further, when the opening degree is high, the memory holding time of the resistance lower peak detection circuit 109 is long, the input fluctuation can be reduced, the driving of the electric blower 57 can be made smooth, and when the opening degree is low, the memory holding of the resistance lower peak detection circuit 109 is held. Since the time is shortened and the responsiveness of the hand operation unit 87 is improved, discomfort can be reduced.

Moreover, since the tolerance of the sliding resistance 181 can be reduced by connecting the resistance 182 in parallel with the sliding resistance 181 of the operation circuit 107, it is convenient for input matching at the minimum input. For example, sliding resistance 181 has an error of ± 20% and resistance value of 200K.
If the resistance value of the resistor 182 is about 15 Ω and the resistance is about Ω, the error is ± 3%.
It will be about.

In addition, the sliding resistance 181, the first conductor 183, and the second conductor 18
By short-circuiting 4, the resistance 182 is parallel to only the sliding resistance 181, so that the change in the combined resistance due to the change in the sliding resistance 181 does not pass the peak value of the quadratic curve and is close to a linear change. In addition, it is possible to prevent the resistances of the sliding resistance 181 and the resistance 182 from being output without being combined.

Further, the increase of the current to the operation circuit 107 is not necessary as long as the current is within a range where the oxide film between the contact portion, for example, the low-voltage terminal ring 79 and its contact can be destroyed. Therefore, the current may be about 1/10 to 1/3 that of the conventional circuit.

Further, the component configuration is the same as the conventional one, and the operation circuit 107 is the same as the conventional one, so that the cost can be reduced and the set voltage can be easily changed by a resistor or the like, so that the influence of the error of the semiconductor itself is small.

In addition, sliding resistance 1
It is possible to connect the operation circuit 107 that does not have the 81 and is only on / off.

In addition, since the storage cycle is automatically changed according to the degree of intermittent resistance value so that the storage time is always at the optimum point, variations in the mechanism of the sliding part, an increase in the sliding part due to changes in model structure, etc. Since the cycle can be changed according to the contact failure due to aging, the contact failure can be made inconspicuous, and when the contact failure is small, the response of the manual operation unit 87 can be made quick, which is convenient for service such as repair. Further, since the lowest resistance value is stored and held in the circuit, there is no unstable element such as average value output.

〔The invention's effect〕

According to the present invention, there is no contact terminal such as a sliding contact between the charging circuit and the power source, and even if the sliding contact between the vacuum cleaner body and the hose is intermittent, the resistance value is lower in the resistance lower peak detection circuit. When the trigger element is held for a certain period of time, the timing of triggering the trigger element is constant and the electrical phase angle for trigger output is stable, so that the output of the electric blower can be stabilized.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the electric vacuum cleaner of the present invention, and FIG.
The same figure shows a block diagram of the resistance value open count output circuit, and FIG. 3 shows a block diagram of the resistance lower peak detection circuit of the same as above.
FIG. 5 is a circuit diagram of the same as above, FIG. 5 is a perspective view of the same as above, FIG. 6 is a longitudinal sectional view of the same as above, and FIG.
The figure is a plan view of the same as above, and FIG. 9 is a circuit diagram of a conventional example. 40 …… Vacuum cleaner body, 57 …… Electric blower, 60 …… Dust collector, 80 …… Hose, 87 …… Hand operation part, 102 …… Control circuit, 103 …… Charging circuit, 104 …… Power supply synchronization Rectifier circuit, 105
...... Trigger circuit, 106 …… Programmable unijunction transistor (PUT) as a trigger element, 1
07 …… Operating circuit, 108 …… Resistance value open count output circuit, 109 …… Resistance lower peak detection circuit, 110 …… Trigger voltage setting circuit, 111 …… Trigger output circuit, 112 …… Power control circuit, 145 …… Trigger Voltage setting terminal, 146 ... Circuit ground side terminal.

Claims (1)

[Claims] 1. A vacuum cleaner main body having a dust collecting section and an electric blower built therein and having a control circuit for controlling the electric blower, and an electric blower detachably connected to the vacuum cleaner main body at a manual operation section. A hose having an operation circuit that changes the resistance value to change the output of the control circuit, the control circuit, a power supply synchronous rectification circuit that rectifies an alternating current
The trigger circuit includes a charging circuit charged by the power supply synchronous rectification circuit, a trigger circuit that triggers according to the charging voltage of the charging circuit, and a power control circuit that controls the output of the electric blower by the output of the trigger circuit. Comprises a trigger element capable of variably setting a trigger voltage, a trigger voltage setting circuit for setting the trigger voltage of the trigger element, and a trigger output circuit for outputting a trigger by the trigger of the trigger element, wherein the trigger voltage setting circuit is A trigger voltage setting terminal is provided between the setting power supply input side and the circuit ground side terminal, and is connected between the trigger voltage setting terminal and the circuit ground side terminal to store and store the resistance value of the operating circuit for a certain period. Resistance lower peak detection circuit that outputs the selected resistance value, and the resistance value output that outputs the open degree of the resistance value to this resistance lower peak detection circuit. A resistance lower peak detection circuit and the resistance value open count output circuit are connected to the operation circuit, and the storage time of the resistance lower peak detection circuit is changed according to the output of the resistance value open count output circuit. An electric vacuum cleaner characterized by doing.