JPH0697871B2 - 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. The present invention relates to a control device that can be switched by a manual operation unit.

(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 sliding variable resistor 35 is set to a resistance value corresponding to the output of the vacuum cleaner. When this resistance value increases, the resistance
PUT26 that turns on when the anode potential exceeds the gate voltage set by 24 and resistor 25 is capacitor 2
Since the charging time of 8 becomes long, the phase control angle of the trigger of the triac 14 becomes large, the electric power supplied to the electric blower 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.

Thus, 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, so that one cycle time is different and the phase angle is shifted.

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 vacuum cleaner according to the present invention includes a dust collector and an electric blower, and an electric vacuum cleaner main body provided with a control circuit for controlling the electric blower, and the electric vacuum cleaner main body. A hose having an operation circuit that is detachably connected and has a resistance value that is variable in order to vary the output of the electric blower in a manual operation unit, and the control circuit is a power supply synchronous rectification circuit that rectifies alternating current, and this power supply. A charging circuit that is charged by the 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, 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 supply input side and the circuit ground side terminal, and the resistance value of the operating circuit is stored for a certain period between the trigger voltage setting terminal and the circuit ground side terminal, and the stored resistance value is stored. Is connected to the resistance lower peak detection circuit, the operation circuit is connected to the resistance lower peak detection circuit, the setting of the trigger voltage is changed by this operation circuit, the trigger phase angle of the voltage control circuit is changed, and the electric blower The input of is variable.

(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 by 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.

Also, the voltage of the trigger voltage setting circuit can be changed by changing the resistance value of the operation circuit arranged in the hand operation part of the hose.
The resistance value of this operation circuit is stored in the resistance lower peak detection circuit, and the stored resistance value is set for a certain period of time.

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

In FIGS. 4 and 5, reference numeral 40 denotes an electric vacuum cleaner body, which is a main body case 42 having an opening 41 formed in an upper front portion thereof, and a lid having a rear end portion pivotally attached to the main body case 42 to open and close the opening 41. It consists of body 43. Further, the main body case 42 is composed of a lower main body case member 44 and an upper main body case member 45 coupled and fixed to the upper side of the lower main body case member 44,
A front handle 46 is provided at the front of the main body case 42, and a cover body 47 is pivotally attached to the upper rear side of the upper main body case member 45 so as to be openable and closable. Inside the cover body 47, a component storage section 48 is provided, in which a temple 49 and a round brush 50 are stored,
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 communicating with the pressure-increasing side of the electric blower 57 is formed on the rear surface of the main body case 42. 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.
The cord reel 63 winds the power cord 62 by pressing the cord reel button 65 protruding from the button opening 64 of the cover body 47. Further, in the lower part of the main body case 42, a pair of wheels are provided on the rear side of both side surfaces and the front side of the lower surface.
66 and a slewing wheel 67 are rotatably provided.

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 releasably engaged with a locking portion 70 formed at the upper end of the front surface of the main body case 42 to hold the lid body 43 in the closed state. Also, the lid 43 and the main body case 42
A handle 71 is provided in the vicinity of a coupling portion with and so as to be rotatable and housed.

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 vacuum cleaner body 40, and the base end of a flexible hose body 84 having a power supply line and a transmission line is attached to the body connection portion 81.
Further, when the hose 80 is connected, the electric 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. As shown in FIGS. 6 and 7, the hand operation part 87 is a hose body.
Grip tube 86 consisting of cover tube 88 and connecting tube 89 connected to 84
A cursor 91 for following the variable sliding resistance is provided on the display plate 90, which is provided on the display plate 90 showing the condition of the surface to be cleaned, and is fixed by the cover body 92. Further, a connection pipe 94 of a suction port body 93 having a built-in brush electric motor therein is attached to the extension pipe 85 so as to be insertable and removable, and the suction port body 93 and the hanging port 49,
The round brush 50 can be selectively used.

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 connected to 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 stores the resistance value of the trigger element 106 that triggers by the charging voltage of the charging circuit 103 and the operation circuit 107 provided in the hand operation unit 87, for example, for a half cycle of the commercial AC power supply 101, and outputs the stored resistance value. It comprises a trigger voltage setting circuit 109 for setting the trigger voltage of the trigger element 106 having a resistance lower peak detection circuit 108, and a trigger output circuit 110 for outputting the output of the trigger element 106. The trigger output circuit 110 is connected to the power control circuit 111, and the power control circuit 111 controls the output of the electric blower 57 by the output of the trigger output circuit 110.

Further, the operation circuit 107 provided in the hand operation unit 87 is connected to the resistance lower peak detection circuit 108.
07 changes the set voltage of the trigger voltage setting circuit 109 via the resistance lower peak detection circuit 108.

An example of a more specific circuit will be described.

Via a fuse 112 to a commercial AC power supply 101, a triac 116 as a power control element having a snubber circuit 115 for surge prevention etc. composed of a capacitor 113 and a resistor 114 connected in series, an electric blower 57 are connected in series. There is.

Further, this electric blower 57 has a noise prevention circuit 120 for noise prevention composed of capacitors 117, 118 and 119. The capacitors 117, 118 and 119 are commercial AC power supply 101 and fuses.
112 is connected to the electric blower 57.

Further, a primary winding 122 of a step-down transformer 121 is connected to both ends of the commercial AC power supply 101 via a fuse 112, and a secondary winding 123 of the transformer 121 has a rectifying diode composed of diodes 124, 125, 126, 127. The bridge 128 is connected, and the resistor 129 and the Zener diode 130 are connected from the positive side to the negative side of the diode bridge 128. The Zener diode 130 includes a resistor 131 connected to direct current and a capacitor 132 for charging, and a resistor 133 and a resistor 13 connected in series.
4 are connected in parallel. The resistance value of the resistor 134 is 10 to 20 times higher than the combined resistance value of the operation circuit 107. A diode 135 for preventing backflow, a resistor 136, a zener diode 137 for constant voltage and a smoothing capacitor 138 connected in parallel are connected in series from the positive side to the negative side of the diode bridge 128. Also,
The resistance lower peak detection circuit 108 stores the lowest resistance value of the operation circuit 107 for a half cycle of the commercial AC power supply 101, and outputs the stored lowest resistance value to the trigger voltage setting circuit 109.
The resistance lower peak detection circuit 108 is connected between the resistor 136, the connection point of the Zener diode 137 and the capacitor 138 and the negative side of the diode bridge 128, and the setting input terminal of the resistance lower peak detection circuit 108 is the trigger voltage setting terminal 140.
The setting output terminal is connected between the resistor 133 on the setting power input side and the resistor 134 on the circuit ground side terminal 141 side.

The resistance lower peak detection circuit 108 is constructed as shown in the block diagram of FIG.

The resistance value set by the operation circuit 107 is detected by the detection circuit 145, and the hold circuit 146 holds the minimum value of the detected resistance value. Then, this held value is synchronized with the synchronization circuit 147.
Thus, the commercial AC power supply 101 is canceled every half cycle of AC. Further, the value of the hold circuit 146 is output to the trigger voltage setting circuit 109 by the output circuit 148.

Further, a specific circuit of the resistance lower peak detection circuit 108 will be described with reference to FIG.

The input terminal of the operational amplifier 151 is connected to the setting input terminal,
The operational amplifier 151 has one end for the reference voltage connected to the power supply 152 and the other end grounded. The output terminal of the operational amplifier 151 is connected to a capacitor 153 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 153 is grounded and is connected to the base. The collector of the transistor 155 to which the synchronizing circuit 147 is connected is connected, and further, the input terminal of the operational amplifier 156 is connected. The output terminal of the operational amplifier 156 is connected to the base of the output transistor 157, the collector is connected to the setting output terminal, and the emitter of the transistor 157 is grounded.

The anode of the programmable unijackation transistor (PUT) 106 serving as the trigger element is connected to the connection point of the resistor 131 and the capacitor 132, and the gate is connected to the connection point of the resistor 133 and the resistor 134. And this PUT10
The cathode of 6 is connected to the load of the diode bridge 128 via the primary winding 162 of the insulating transformer 161. Further, one end of the secondary winding 163 of the transformer 161 is connected to the gate of the triac 116 via a stabilization circuit 166 including a resistor 164 and a diode 165 for preventing false ignition, and the secondary winding 1
The other end of 63 is connected to the connection point between the triac 116 and the fuse 112.

A sliding resistance 171 and a resistance 172 for correcting the resistance value of the sliding resistance 171 are connected in parallel to the trigger voltage setting terminal 140, and a first conductor 173 and a second conductor 174 are connected to the tip. Has been done. Further, the circuit ground side terminal 141 has the first
Third conductor 17 shorter than second conductor 173 and second conductor 174
5 is connected. Then, the sliding resistance 171 and the first conductor
A first slider 176 is provided between 173 to electrically connect the sliding resistance 171 and the first conductor 173, and to connect the second conductor 174 and the third conductor 173.
A second slider 177 is provided between the conductors 175 of the second conductor 175 and has an electrically open portion for turning off to electrically connect the second conductor 174 and the third conductor 175. There is. Furthermore, the first
The slider 176 and the second slider 177 of FIG.
To follow.

The operation of the above embodiment will be described.

First, when the cursor 91 of the manual operation part 87 is slid, the first slider 176 and the second slider 177 are driven by the cursor 91, and the sliding resistance 171 and the first conductor 173 and the second conductor 173 Conductor 174 and third conductor 175 make electrical contact. As a result, the resistance lower peak detection circuit 108 and the operation circuit 107 are electrically connected. And capacitor 13 applied to the anode of PUT 106
The charging voltage of 2 is the voltage applied to the gate of the PUT 106, which is set in the trigger voltage setting circuit 107 with the resistance value set by changing the resistance value of the operation circuit 107 and stored in the resistance lower peak detection circuit 108 as the voltage. PU because it will be higher
The T106 is turned on and the electric blower 57 is driven. Note that the resistance 134
Since the resistance value of is very high, the resistance lower peak detection circuit 10
The voltage corresponding to the resistance value of 8 almost determines the set voltage.

At this time, first, the voltage of the commercial AC power supply 101 is
It is stepped down by the diode bridge 128 and rectified by the resistor 129.
The zener diode 130 is used to make the voltage constant. Then, the capacitor 132 of the charging circuit 103 is charged, and this capacitor 13
When the charging voltage of 2 becomes higher than the set voltage of the trigger voltage setting circuit 109 which is set by the operation circuit 107 and is stored and output by the resistance lower peak detection circuit 108, the PUT 106 is turned on. Also,
The capacitor 132 discharges in synchronization with the voltage of the power supply synchronous rectification circuit 104.

When the PUT 106 is turned on, the transformer 161 of the trigger output circuit 110 triggers the gate of the triac 116 of the power control circuit 111 to turn on the triac 116 and phase control the electric power according to the angle at which the triac 116 is turned on. Control output.

When controlling the output of the electric blower 57,
The resistance value of the sliding resistance 171 is changed according to the condition of the surface to be cleaned indicated by the cursor 91 of 87 on the display plate 90.

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 171. As a result, the resistance value stored in the resistance lower peak detection circuit 108 increases, the output voltage of the resistance lower peak detection circuit 108 increases, and the resistance of the voltage applied to the resistance of the resistance 133 and the resistance of the voltage of the resistance lower peak detection circuit 108 increases. Since the voltage division ratio of the lower peak detection circuit 108 becomes large, the PUT set by the trigger voltage setting circuit 109
Since the voltage of the gate of 106 becomes high and the charging time to the set voltage of the capacitor 132 becomes long, the time when the PUT 106 is turned on becomes slow, and the phase control angle of the triac 116 also becomes large, so the output of the electric blower 57 becomes small. .

On the contrary, 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 171. As a result, the resistance value stored in the resistance lower peak detection circuit 108 becomes smaller, the output voltage of the resistance lower peak detection circuit 108 becomes lower, and the resistance of the voltage applied to the resistance of the resistance 133 and the voltage of the resistance lower peak detection circuit 108 decreases. Since the voltage division ratio of the lower peak detection circuit 108 becomes smaller, the PUT10 set by the trigger voltage setting circuit 109 is set.
The voltage of the gate of 6 becomes low, the charging time to the set voltage of the capacitor 132 becomes short, the time to turn on the PUT 106 becomes short, and the phase control angle of the triac 116 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 174 and the third conductor 175, the voltage of the resistance lower peak detection circuit 108 becomes very high and the resistance 1
Since the resistance value of 34 is very high, the voltage of the resistor 133 and the resistance 13 of the voltage of the resistor lower peak detection circuit 108 and the resistor 134 are
The voltage division ratio of 4 becomes very high, the gate voltage of the PUT 106 set by the trigger voltage setting circuit 109 becomes much higher than the charging voltage of the capacitor 132, the trigger element 106 is not turned on, and the triac 116 is not turned on. 57 does not drive.

Similarly, when the hose 80 is detached from the electric vacuum cleaner body 40, or when at least one of the trigger voltage setting terminal 140 and the circuit ground side terminal 141 is opened, the electric blower 57 is not driven.

According to the above embodiment, the resistance lower peak detection circuit 108 stores and outputs the minimum value of the resistance value set in the operation circuit 107 for a half cycle, so that the operation circuit 107 intermittently opens and outputs a high resistance value. Even if it is shown momentarily, 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 108 for a half cycle of the commercial AC power supply 101, so that the time for turning on the PUT 106 becomes constant. As a result, the control phase angle becomes constant and the output of the electric blower 57 can be stably driven. Further, the resistance lower peak detection circuit 108 can be set as long as it is in contact with 1 μS or less in a half cycle.

Further, the cycle stored in the resistance lower peak detection circuit 108 is not limited to a half cycle, and may be one cycle, one half, or two cycles or more.

Further, by connecting the resistor 172 in parallel with the sliding resistor 171 of the operation circuit 107, the tolerance of the sliding resistor 171 can be reduced. For example, when the sliding resistance 171 has an error of ± 20% and the resistance value is about 200 KΩ and the resistance value of the resistor 172 is 15 KΩ, the error becomes about ± 3%.

Further, by short-circuiting the sliding resistance 171, the first conductor 173, and the second conductor 174, only the sliding resistance 171 has a resistance 172.
Since it is arranged in parallel, the change of the combined resistance with the change of the sliding resistance 171 can be close to the linear change without passing the peak value of the quadratic curve, and the resistance of the sliding resistance 171 and the resistance 172 is combined. It is possible to prevent the output without being performed.

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 71 and is only on / off.

FIG. 8 shows another embodiment in which a semi-fixed resistor 181 is connected to the resistance lower peak detection circuit 108 of the circuit shown in FIG.
Specifically, as shown in FIG. 9, a resistance lower peak detection circuit
A semi-fixed resistor 181 is connected to the synchronizing circuit 147 of 108.

Then, by changing the resistance value of the semi-fixed resistor 181, it is possible to arbitrarily change the cycle of the synchronizing circuit 147, for example, 50 cycles or 100 cycles, whereby the resistance value is stored and set in the hold circuit 146. Time is arbitrary.

According to the above embodiment, the output of the electric blower 57 is more stable because the PUT 106 can be reliably turned on by changing the cycle of the resistance lower peak detection circuit 108 even if the intermittent time of contact failure is somewhat long. To do.

Furthermore, since the storage cycle can be changed according to the degree of interruption,
Since the cycle can be changed according to variations in the sliding part mechanism, increase in sliding parts due to changes in the model structure, or contact defects due to aging, contact defects can be made inconspicuous and convenient for repair and other services. Is.

〔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.
FIG. 3 is a block diagram of the resistance lower peak detection circuit of the same as above, FIG. 3 is a circuit diagram of same as above, FIG. 4 is a perspective view of the same as above, FIG. 5 is a longitudinal sectional view of same as above, and FIG. FIG. 7 is a plan view of the same as above, FIG. 8 is a circuit diagram of another embodiment, FIG. 9 is a circuit diagram of a resistance lower peak detection circuit of the same as above, and FIG. 10 is a circuit diagram of a conventional example. 40 …… Vacuum cleaner main body, 57 …… Electric blower, 60 …… Dust collection part, 80 …… Hose, 87 …… Hand operation part, 101 …… Power supply, 1
02 ... Control circuit, 103 ... Charging circuit, 104 ... Power supply synchronous rectification circuit, 105 ... Trigger circuit, 106 ... Programmable unijunction transistor (PUT) as a trigger element, 107 ... Operation circuit, 108 ...... Resistance lower peak detection circuit, 109 ...... Trigger voltage setting circuit, 110 …… Trigger output circuit, 111 …… Power control circuit, 140 …… Trigger voltage setting terminal, 141 …… Circuit ground side terminal.

Claims (2)

[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 the resistance value of the operating circuit is stored and stored for a certain period between the trigger voltage setting terminal and the circuit ground side terminal. A resistance lower peak detection circuit that outputs a resistance value is connected, and the operation circuit is connected to this resistance lower peak detection circuit. An electric vacuum cleaner characterized in that the resistance value is varied to vary the setting of the trigger voltage, and the trigger phase angle of the power control circuit is varied to vary the input of the electric blower. 2. The vacuum cleaner according to claim 1, wherein the storage time of the resistance lower peak detection circuit can be changed.