JP2008099937A - Vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum cleaner which does not commit a misjudgement of switch operations even when the voltage becomes low transitionally. <P>SOLUTION: This vacuum cleaner has an electric blower 2 as a load, a judgement means (not in the figure) which judges the operation status of an operation means 4 which outputs signals of different voltages or currents, a control means (not in the figure) which switches the control status of the load according to the judgement by the judgement means, a voltage-detecting means (not in the figure) which detects the voltage of a first power source 21 which is the power source of the operation means 4, and a second power source 22 which supplies a standard voltage for setting a judgement value for judging the operation status of the operation means 4. The judgement means judges whether the control status of the electric blower 2 should be switched or not according to the voltage detected by the voltage-detecting means. Since the judgement means judges the control status after determining a judgement value to an input signal from the operation means 4 according to the voltage of the first power source 21, the output signal of the operation means 4 can be precisely judged even if the voltage of the commercial power source becomes low transitionally. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to general household or business use vacuum cleaners, and more particularly to control of a vacuum cleaner load.

  A conventional vacuum cleaner will be described with reference to FIGS. FIG. 10 is an overall perspective view of a conventional vacuum cleaner, and FIG. 11 is a circuit diagram of the vacuum cleaner.

  In FIG. 10, 1 is a main body of the vacuum cleaner, 2 is an electric blower built in the main body 1 and generates a suction force, and 3 is an operation mode of the electric blower 2 with different electric power. A hose having an operation means 4, 5 is an extension pipe, 6 is a dust collection chamber for storing sucked dust, and the hose 3 and the dust collection chamber 6 are intake air provided in the main body 1. The dust collection chamber 6 and the hose 3, or the dust collection chamber 6, the hose 3, and the extension pipe 5 form an intake passage 18 that are connected via the port 7. Reference numeral 8 denotes a power cord having a power plug, which supplies power to the main body 1 by connecting the power plug to a commercial power source.

  Reference numeral 9 denotes a suction tool connected to the tip of the extension pipe 5 and sucking dust on the floor surface together with air, and has a built-in rotary brush 10 that sweeps up dust on the floor surface and an electric motor 11 that rotationally drives the rotary brush 10. ing.

  In FIG. 11, reference numeral 14 denotes control means, which has a microcomputer 15. The operation means 4 is composed of three switches SW1 to SW3 and resistors r1 to r4. By pressing one of the switches SW1 to SW3, the power supply VDDsw of the operation means 4 is changed to the resistors r1 to r4 and the switches SW1 to SW3. A voltage divided by different combined resistors that change by operation appears at Vout in FIG. 11 and is input to the microcomputer 15.

Normally, this kind of analog signal is input to an AD (analog-digital) conversion port having a function of the microcomputer 15, converted into a digital value inside the microcomputer 15, and converted into a digital value. The numerical determination values corresponding to each of SW1 to SW3 are compared to determine which switch has been pressed. At this time, the AD conversion circuit of the microcomputer 15 inputs the power supply VDDad for the AD conversion function and uses this as a reference voltage. For example, if the digitized value is an 8-bit width value,
(Vout / VDDad) * 255 (Formula 1)
Is a numerical value corresponding to the switch pressed by the operating means 4.

  The microcomputer 15 turns on / off the bidirectional thyristor 16 that is the driving means of the electric blower 2 and the bidirectional thyristor 17 that is the driving means of the electric motor 11 according to the voltage Vout input from the operation means 4. Alternatively, the power supplied to the electric blower 2 and the electric motor 11 is controlled by performing phase control by controlling the trigger phase.

  The intake passage 18 is supplied with electric power from the main body 1 side to the operation means 4 and transmits a signal corresponding to the mode operated by the operation means 4 to the main body 1 side, and the electric motor from the main body 1 to the electric motor 18 A pair of power supply lines 13 that supply power to 11 are arranged, and the microcomputer 15 provided in the main body 1 supplies power to the electric blower 2 and the electric motor 11 according to the mode set by the operating means 4. Control power. Moreover, the microcomputer 15 has a plurality of modes according to the difference between the applied voltage to the electric blower 2 and the electric motor 11 and the supply power. The user can operate the vacuum cleaner in a desired mode by operating the switches SW1 to SW3 of the operation means 4.

  A processing method for determining an operation set by the operation means 4 by a control means such as the microcomputer 15 is described in, for example, Patent Document 1 below.

In the electric vacuum cleaner configured as described above, the user operates the operation means 4 to set the predetermined mode, and the microcomputer 15 supplies the electric blower 2 and the electric motor 11 with electric power corresponding to the mode. When the operation mode is changed from the stop mode in which the electric power supplied to the electric blower 2 and the electric motor 11 is stopped to the operation mode in which electric power is supplied, the dust sucked from the suction tool 9 is collected via the intake path 18. Accumulated in the dust chamber 6.
JP 2006-6463 A

  In general, a device connected to a commercial power source is provided with a capacity to maintain the operation of the device for a while even if an instantaneous power failure occurs in the commercial power source. As described above, in the configuration in which the power source of the operation unit 4 and the reference voltage for determining that the switches SW1 to SW3 (hereinafter referred to as “switches”) of the operation unit 4 are pressed are independent, the operation unit 4 The power supply of the control system input to the microcomputer 15 such as VDDad is longer than the power supply VDDsw of the load system as described above.

  In addition, in order to make the main body 1 and the hose 3 detachable, in a configuration in which a mechanical contact is generated in the signal line, the power supply voltage is set high in consideration of prevention of poor electrical contact. Thus, a technique for securing a current flowing through the contact point is also taken.

  However, in the above configuration, when an instantaneous power failure of several tens to several hundreds of milliseconds occurs in the commercial power supply, if only the load power supply VDDsw decreases during this time, the switches SW1 to SW3 of the operation means 4 are not operated. Nevertheless, a change occurs in Vout, and the microcomputer 15 normally determines that the switches have been pressed within a few hundred milliseconds, as if the switches of the operating means 4 were operated. , Misjudgment. In order to prevent this, for example, if the value of the time determination is increased, a situation in which no response occurs even if the switch is operated in a normal operation occurs.

  In addition, what is described in Patent Document 1 accepts the operation of a switch when the maximum value and the minimum value of Vout are within a predetermined range, and the Vout of the operation means 4 when the switch is operated. If a predetermined range is set by paying attention to the difference between the behavior and the behavior when the power supply is cut off or lowered, it may be possible to prevent erroneous determination at the time of an instantaneous power failure. Depending on the method and the state of the contact, there is a possibility that the operability may be deteriorated such as no reaction even if the switch is operated against the user's intention.

  As described above, in the configuration of the conventional vacuum cleaner described above, it is erroneously determined that the operation unit 4 has been operated even when the operation unit 4 is not operated at the time of a transient voltage drop such as an instantaneous power failure. When trying to prevent this, there is a problem that the operability of the switch is adversely affected.

  The present invention solves the above-mentioned conventional problems, and is a transient low voltage of the voltage supplied to the vacuum cleaner, which occurs when an instantaneous power failure of a commercial power supply, the attachment or detachment of a power plug, or an instantaneous contact abnormality occurs. An object of the present invention is to provide a vacuum cleaner that prevents switching of the control state due to erroneous determination of the output signal of the operation means and improves the operation accuracy of the operation means without impairing the operability of the operation means even during application of It is what.

  In order to solve the above-described conventional problems, the vacuum cleaner of the present invention has, as a load, an electric blower that generates at least suction air, and an operation unit that outputs signals of different voltages or current values, and the operation Determining means for determining an operation state of the operation means based on a signal output from the means; control means for switching a control state of the load according to a determination result of the determination means; and a first power source that is a power source of the operation means And a second power supply for supplying a reference voltage for setting a judgment value for judging the operating state of the operating means, and a voltage detecting means for detecting the voltage of the first power supply. The determination means determines whether or not to switch the control state of the load according to the voltage detected by the voltage detection means, and the determination means operates according to the voltage of the first power source. Since the operation state is determined by determining the judgment value for the signal input from the means, and the control state of the load is switched by the control means, even when the voltage of the commercial power supply drops transiently due to an instantaneous power failure etc., it is highly accurate It is possible to determine the output signal of the operation means and prevent the load control state from being switched due to erroneous determination of the output signal of the operation means.

  The vacuum cleaner of the present invention is generated even when a transient low voltage of the voltage supplied to the vacuum cleaner is applied, such as when there is an instantaneous power failure of a commercial power supply, when a power plug is attached or detached, or when an instantaneous contact abnormality occurs. Without changing the operability of the operation means, it is possible to prevent the control state from being switched due to erroneous determination of the output signal of the operation means, and to improve the operation accuracy of the operation means.

  The first invention includes an electric blower that generates at least suction air as a load, and operates the operating means by operating means that outputs signals of different voltages or current values, and signals output from the operating means. A determination unit that determines a state; a control unit that switches a control state of a load according to a determination result of the determination unit; a first power source that is a power source of the operation unit; and an operation of the operation unit in the determination unit A second power supply for supplying a reference voltage for setting a determination value for determining a state; and a voltage detection means for detecting a voltage of the first power supply, wherein the determination means detects the voltage detection means. The determination means determines whether to switch the load control state according to the voltage to be applied, and the determination means determines a determination value for the signal input from the operation means according to the voltage of the first power supply. Therefore, even if the voltage of the commercial power supply drops transiently due to an instantaneous power failure, etc., the output signal of the operation means can be determined with high accuracy and the operation can be performed. It is possible to prevent switching of the load control state due to erroneous determination of the output signal of the means.

  In the second invention, in particular, the voltage of the first power supply of the first invention is set to be higher than the voltage of the second power supply. In this case, even if the voltage of the first power supply decreases, the voltage of the second power supply is highly likely to be maintained, and the accuracy of determination by the determination means can be improved.

  According to a third aspect of the invention, in particular, when the voltage detected by the voltage detecting means is outside a predetermined voltage range, the judging means of the first or second aspect of the invention controls the load regardless of the signal output from the operating means. The state is determined not to be switched, and a commercial power supply drop or the like occurs due to an instantaneous power failure, and the voltage of the first power source detected by the voltage detection unit corresponds to a normal voltage range. The determination means determines that the signal input from the operation means is valid when it is within the range, and determines that the signal is invalid when it is outside the predetermined range, and controls the load only when it is valid. Since the state is switched, erroneous determination and malfunction can be prevented.

  According to a fourth aspect of the invention, in particular, when the voltage detected by the voltage detecting means is outside a predetermined voltage range, the judging means of the first or second aspect of the invention is at least regardless of the signal output from the operating means. It is judged not to switch the control state of the electric blower, and at least the basic function as a vacuum cleaner that performs suction, such as starting suction without permission from the stopped state or stopping suction during cleaning On the other hand, malfunction due to a transient voltage drop can be prevented, and usability and safety performance can be ensured.

  In particular, the fifth invention has an electric motor that is built in the suction tool as a load of any one of the first to fourth inventions and drives a rotating brush that sweeps up dust on the surface to be cleaned. When the voltage detected by the detection means is outside the predetermined voltage range, it is determined not to switch at least the control state of the motor regardless of the signal output from the operation means, and at least faces the surface to be cleaned. Therefore, it is possible to prevent a malfunction that the rotating brush that is exposed in order to start rotating without permission from the stopped state.

  In the sixth invention, in particular, the control means according to any one of the first to fifth inventions has at least two control states of a stop state for stopping the load and an operation state for operating the load, The judging means switches the control state when the voltage detected by the voltage detecting means is outside a predetermined voltage range, and when the signal output from the operating means is switching from the stop state to the operating state. Therefore, it is possible to prevent the vacuum cleaner from starting its own operation due to a transient voltage drop such as an instantaneous power failure.

  In the seventh invention, in particular, the control means according to any one of the first to fifth inventions has at least two control states of a stop state for stopping the load and an operation state for operating the load, When the voltage detected by the voltage detecting means is outside a predetermined voltage range, the judging means switches the control state when the signal output from the operating means is a switch from the operating state to the stopped state. Even if a transient voltage drop such as an instantaneous power failure occurs during the cleaning operation, the load such as the electric blower can be stopped without stopping and the usability can be improved. I can do it.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
Hereinafter, the vacuum cleaner in the 1st Embodiment of this invention is demonstrated using FIGS. In addition, the same code | symbol is attached | subjected about the same component as the said conventional vacuum cleaner (FIG. 10, FIG. 11), and the description is abbreviate | omitted.

  FIG. 1 is a circuit configuration diagram of a vacuum cleaner in the present embodiment.

  In FIG. 1, reference numeral 15 denotes a microcomputer, which has a + side power supply terminal Vdd for operating the microcomputer 15 and a − side power supply terminal GND. The microcomputer 15 has analog-digital inputs AD1 and AD2 having a function of converting an analog signal into a digital value, and the reference voltage is shared with Vdd in the microcomputer 15.

  Reference numeral 21 denotes a first power supply that generates a voltage VDDsw to be supplied to the operation means 4 and is generated by converting AC of the commercial power supply 23 into DC. Reference numeral 22 denotes a second power source that generates the power source of the microcomputer 15 and the reference voltage voltage VDDad from the first power source 21 and is set to have a relationship of VDDsw> VDDad. This is because the operation means 4 is arranged on the hose 3 and the first power source 21 is arranged on the main body 1 side, thereby simplifying the wiring and circuit configuration of the hose 3 and reducing the number of parts to reduce the weight. Therefore, with respect to the mechanical / electrical contact existing between the main body 1 of the signal line 12 and the hose 3, a certain high applied voltage and current value are secured to suppress generation of non-conducting substances. For this reason, VDDsw is set higher. In general, Vdd and VDDad are 5V and 3V signal level voltages, and VDDsw is set to a higher value.

  In the present embodiment, the signal line 12 and the one side line of the power supply line 13 to the electric motor 11 are used as a common line, and the wiring is simplified. The microcomputer 15 uses Vdd as a reference voltage, inputs a signal from the operation means 4 from the AD 2, and determines the operation state of the operation means 4 according to the operation state of the operation means 4 determined by the determination means. Control means for switching the control state of the electric blower 2 and the electric motor 11, and a function as voltage detection means for monitoring and detecting the voltage of the first power supply 21 by a signal input from the AD1, The microcomputer 15 will be described.

  In FIG. 1, the operation means 4 has three switches SW1, SW2, and SW3. When the switches are pressed, the combined resistance of the resistances r1, r2, r3, and r4 of the operation means 4 changes. The microcomputer 15 determines the operating state of the operating means 4 from the combined resistance and the signal voltage appearing at the AD2 terminal of the microcomputer 15 by the divided resistor r0 existing on the main body 1 side, and the first power source 21 The voltage VDDsw is applied to these resistors.

When the potential of the GND terminal of the microcomputer 15 is used as a reference, the voltage Vout input to the AD1 of the microcomputer 15 is not pressed.
Vdd − (((r1 + r2 + r3 + r4) / (r0 + r1 + r2 + r3 + r4)) * VDDsw) (Formula 2)
When SW3 is pressed,
Vdd − (((r1 + r2 + r3) / (r0 + r1 + r2 + r3)) * VDDsw) (Equation 3)
When SW2 is pressed,
Vdd-(((r1 + r2) / (r0 + r1 + r2)) * VDDsw) (Formula 4)
When SW1 is pressed,
Vdd-(((r1) / (r0 + r1)) * VDDsw) (Formula 5)
It becomes.

In addition, since the voltage input to AD1 is VDDsw> VDDad, R0 and R1 are set to be equal to or lower than Vdd, and VDDsw is divided.
Vdd-((R1) / (R0 + R1)) * VDDsw (Formula 6)
The voltage of the first power supply 21 is detected.

  Further, the microcomputer 15 outputs a trigger timing signal of the first bidirectional thyristor 16 from the OUT1 terminal, changes the voltage applied to the electric blower 2, and performs phase control for controlling the supplied power. In addition, the motor 11 is controlled by changing the voltage applied to the motor 11 by outputting the trigger timing signal of the second bidirectional thyristor 17 from the OUT2 output. Further, as shown in Table 1, the microcomputer 15 selects “stop”, “weak mode”, and “strong mode” as the control means corresponding to the switches SW1, SW2, and SW3 of the operation means 4. And for each mode, the electric blower 2 and the electric motor 11 are controlled in advance.

  Further, as a determination means, the signal input from AD2 is divided into four voltage sections, with determination value 1, determination value 2, and determination value 3, between GND and Vdd as shown in FIG. SW1 is pushed if the signal voltage is higher than the judgment value 1, SW2 is pushed if the signal voltage is higher than the judgment value 2, SW3 is pushed if the signal voltage is higher than the judgment value 3, otherwise Judge that nothing has been operated.

  About the vacuum cleaner comprised as mentioned above, the operation | movement is demonstrated below.

  When the power plug of the power cord 8 is connected to a commercial power source, the first power source 21 is activated, and VDDsw is output as shown in FIG. When VDDsw is generated, the second power supply 22 generates and outputs VDDad based on this, and is applied between Vdd and GND of the microcomputer 15. The microcomputer 15 starts its operation, determines the operation status of the operation means 4 according to the voltage of Vout, and controls the electric blower 2 and the motor 11. At this time, nothing is operated on the operation means 4. If not, Vout becomes the voltage shown in the above (Equation 2), the voltage level is in the range of the determination value 3 or less, and control is performed so as to maintain the state where the power supply to the electric blower 2 and the electric motor 11 is stopped. To do.

  For example, if the switch SW3 of the operating means 4 is pressed, the voltage of Vout becomes the voltage shown in the above (Equation 3), which is a voltage level in the range between the judgment value 3 and the judgment value 2. When the voltage level in the range continues for the determination time T, it is determined that the operation state of the operation means 4 is confirmed, and the electric blower 2 and the electric motor 11 are controlled in the control state corresponding to the “strong mode” shown in Table 1 above. Transition to control.

  When SW1 is operated, Vout becomes the voltage shown in (Equation 5), which is a voltage level equal to or higher than the determination value 1. At this time, control is being performed in “strong mode” or “weak mode”. If there is, the power supply to the electric blower 2 and the electric motor 11 is stopped, and the process proceeds to “stop”.

  The determination values 1 to 3 have a digital value inside the microcomputer 15 with VDDad applied to Vdd as a reference voltage. For example, if VDDad = 5V and the determination value 3 = 1V, (1/5) * 255 = 51 counts (0x0033), and the microcomputer 15 has the digital value of Vout represented by the above (Equation 1), The digital value of the determination value 1 is compared to determine the operation state of the operation means 4.

  Normally, the first power supply 21 and the second power supply 22 are charged by an element such as a capacitor so that the output voltage is maintained for a while even when power supply (voltage application) from the commercial power supply is interrupted. It has a configuration with functions. This is because even when an instantaneous power failure occurs, if the power failure period is about several hundreds of milliseconds, it is desired to continue to operate the device. For this reason, the power cord 8 is unplugged from the commercial power source, Even if the power supplied to the main body 1 is turned off, as shown in FIG. 3, both VDDsw and VDDad are maintained for a while and then the voltage is lowered.

  At this time, since no voltage is applied to the power plug, the voltage drops to 0V. If VDDsw decreases and changes, as can be seen from (Expression 2) to (Expression 5), Vout also decreases in the same manner, but if VDDad (Vdd) decreases to 0 V within the determination time T, the microcomputer The operation | movement of 15 also stops and it will be in the stop state as a vacuum cleaner.

  However, as described above, the characteristics of the voltage applied to the main body 1 due to the power failure of the commercial power supply or the power cord 8 being unplugged, the output VDDsw of the first power supply 21, the second power supply 22 The decay characteristics of the output voltage VDDad are different from each other, and the sustain time and the decay characteristics vary depending on the current flowing through each power supply at that time, so that the VDDad of the output voltage of the second power supply 22 is normal. However, if the output VDDsw of the first power supply 21 is lowered and not normal, the microcomputer 15 erroneously determines the operation state of the operation means 4.

  For example, there is a situation in which an instantaneous power failure occurs for a determination time T or longer, the minimum voltage does not decrease to 0 V, and only the output voltage VDDsw of the first power supply 21 decreases as shown in FIG. In the state where the operation means 4 is not operated at all, when VDDsw decreases according to the above (Equation 2), Vout increases, and the determination value 3 is set for the determination time T or longer as shown in FIG. In the case of the microcomputer 15 receiving normal VDDad as a reference voltage, a signal as if the SW3 is pressed is generated.

  The microcomputer 15 receives from the AD 1 a voltage signal Vvolt obtained by converting the output voltage of the first power supply 21 into a signal of the level between Vdd and GND, as shown in the above (Formula 6). The voltage of the power source 21 is monitored. Further, Vstd corresponding to normal VDDsw is used as a reference voltage of the voltage signal input from AD1, and the voltage signal Vvolt input from AD1 is compared with Vstd.

  Vvolt input from AD1 is converted into a digital value inside the microcomputer 15 in the same manner as AD2, and is compared with Vstd set by the digital value.

  FIG. 6 is a flowchart for determining the operation state of the operating means 4, and FIG. 7 shows the relationship between Vout and the determination value when VDDsw decreases. The microcomputer 15 performs the operation with respect to Vvolt input from AD1. As shown in Table 2, the division when VDDsw is normal is A division, the voltage of Vout is the reference Vstd, and is divided into five divisions from division A to division E. In each division, Vvolt, When the instantaneous power failure described with reference to FIG. 4 occurs, it has a determination value 1, a determination value 2, and a determination value 3 corresponding to VDDsw. By switching to judgment value 1, judgment value 2, and judgment value 3 corresponding to Vvolt, judgment on Vout is performed.

  FIG. 7 is an example when an instantaneous power failure occurs in which Vvolt drops to Category A, that is, from a substantially normal voltage to Category C when the operating means 4 is not operated. By setting the time to be performed shorter than the determination time T, it is possible to make a determination with a determination value corresponding to VDDsw, and to operate with high accuracy without erroneous determination regardless of changes in the first power supply 21 due to an instantaneous power failure or the like. The operation state of the means 4 can be determined.

  Furthermore, instead of detecting the commercial power voltage input to the vacuum cleaner and switching the judgment value, the voltage of the power supply supplied to the operating means 4 is directly detected and the judgment value is switched in real time. This is a configuration that can make the switching speed of the judgment value with respect to the decrease the fastest, and the judgment accuracy of the operation means 4 can be further improved.

  In the present embodiment, as shown in Table 2, the setting in which the determination value 1, the determination value 2, and the determination value 3 are associated in advance with the determination value corresponding to the voltage VDDsw (Vvolt) of the first power supply 21 is set. However, the determination value for the power supply voltage of the first power supply 21 may be set by calculation using the ratio of Vvolt to the reference Vstd and the correction value.

  In the present embodiment, the power source of the main body 1 itself has been described as a commercial power source. However, the input side of the first power source 21 or the second power source 22 may be a DC input, such as a battery or a DC power source. It is effective that the input side of the first power source 21 and the second power source 22 fluctuates depending on the load and the operation of the electric blower 2 and the like, and the influence on the determination of the operation state of the operation means 4 can be improved. Needless to say.

(Embodiment 2)
FIG. 8 is a flowchart of the operation determination of the electric vacuum cleaner according to the second embodiment of the present invention. In addition, about the same component as the vacuum cleaner in the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The difference from the first embodiment is a part that performs processing as a determination means in the microcomputer 15.

  Hereinafter, the operation of the vacuum cleaner in the present embodiment will be described.

  In FIG. 8, the microcomputer 15 inputs the signal voltage Vvolt corresponding to the voltage VDDsw of the first power supply from AD1 in step 1 and converts it into a digital value. The microcomputer 15 has a preset lower limit value as a boundary of a predetermined range with respect to Vvolt, and in step 2, the Vvolt input from AD1 is compared with the lower limit value. If it is less than the lower limit value, it is determined that VDDsw has decreased for some reason such as an instantaneous power failure, and that the signal level appearing at Vout is not a signal level corresponding to the operating state of the operating means 4, and the process proceeds to step 7 Then, the determination process is terminated without doing anything.

  If Vvolt is equal to or greater than the lower limit value, the process proceeds to step 3. Thereafter, it is determined that Vout is a normal signal for transmitting the operation state of the operation means 4. In step 3, AD2 to which Vout, which is an operation state signal of the operation means 4, is input is input and converted into a digital value.

  In step 4, first, comparison is made with determination value 1, and if Vout is equal to or less than determination value 1, the process proceeds to step 5. If the state where Vout is higher than the determination value 1 continues for the determination time T, it is determined that the switch SW1 is pressed. When the microcomputer 15 determines that the switch SW1 has been pressed, if the mode is “strong” or “weak”, the microcomputer 15 stops supplying power to the electric blower 2 and the motor 11 and shifts to the “stop” state. .

  In step 5, as with step 4, determination is made for determination value 2. If Vout is equal to or less than determination value 2, the process proceeds to step 6. If Vout is larger than the determination value 2 and continues for the determination time T, it is determined that the switch SW2 has been pressed. If it is “strong” or “stop”, the process shifts to “weak” and the electric blower 2 and the electric motor 11 are switched. Take control.

  In Step 6, similarly, if the state where Vout is equal to or lower than the determination value 3 continues for the determination time T with respect to the determination value 3, it is determined as “no operation”, and if higher than the determination value 3, the switch SW3 is If it is determined that the button has been pressed and if it is “weak” or “stop”, the state is shifted to the “strong” state and the electric blower 2 and the electric motor 11 are controlled.

  In step 7, the determination of the operation state of the operation means 4 is terminated.

  As described above, according to the present embodiment, when the voltage of the first power supply 21 that supplies power to the operation means 4 decreases and the signal of the operation means 4 is determined in this state, an erroneous determination is made. The voltage of the operation means 4 is not determined, and the determination is made again when the voltage is restored. Therefore, the operation means is not damaged, and the operation means is not damaged. Therefore, it is possible to provide a vacuum cleaner with improved usability that does not cause the erroneous determination of No. 4.

(Embodiment 3)
FIG. 9 is a flowchart of operation determination of the electric vacuum cleaner according to the third embodiment of the present invention. In addition, about the same component as the vacuum cleaner in the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The difference from the first embodiment is a part that performs processing as a determination means in the microcomputer 15.

  Hereinafter, the operation of the vacuum cleaner in the present embodiment will be described.

  In FIG. 9, the microcomputer 15 inputs a signal voltage Vvolt corresponding to the voltage VDDsw of the first power supply from AD1 in step 1 and converts it into a digital value. Also, AD2 to which Vout, which is an operation state signal of the operation means 4, is input is input and converted to a digital value.

  The microcomputer 15 has a preset lower limit value with respect to Vvolt, and in step 2, the Vvolt input from AD1 is compared with the lower limit value. If it is less than the lower limit value, it is determined that VDDsw has decreased for some reason such as an instantaneous power failure, and that the signal level appearing at Vout is not a signal level corresponding to the operating state of the operating means 4, and then go to Step 3 If it is greater than or equal to the lower limit value, the process proceeds to step 5.

  Step 5 is a step when it is determined that the signal level appearing at Vout is a normal signal level corresponding to the operating state of the operating means 4, and is the step after step 4 in FIG. 8 described in the second embodiment. Judgment processing is performed.

  In Step 3, first, it is confirmed whether or not the current mode is “stop”. If it is not the stop mode, the process proceeds to Step 5, and if it is “Stop”, the process proceeds to Step 4.

  In step 4, as in step 5, Vout is compared with determination value 1, determination value 2, and determination value 3, and it is determined that one of switch SW1, switch SW2, or switch SW3 has been pressed. However, at this time, when Vout is higher than the determination value 2 and higher than the determination value 3, that is, at the signal level corresponding to the switches SW2 and SW3, the process proceeds to step 6 without doing anything. The determination of the operation state is terminated, and it is determined that only the operation of shifting to “stop” and “no operation” are accepted when SW1 is pressed.

  As a result, when an instantaneous power outage or the like occurs, the user may change the mode while driving with `` strong '' or `` weak '', but can leave an opportunity to continue cleaning, At least in the “stop” state, it does not start to operate with “strong” or “weak” against the user's intention, and safety can be ensured while maintaining usability.

  Similarly, when the microcomputer 15 is operating at “weak” or “strong” when Vvolt is less than the lower limit value, the microcomputer 15 determines not to accept the signal level of Vout corresponding to the switch SW1. When an instantaneous power failure or the like occurs during operation, the system does not shift to “stop” against the intention of the user, and usability can be ensured.

  As described above, in the vacuum cleaner according to the present invention, in the configuration in which the power supply of the operation unit and the power supply of the determination unit that determines the operation state of the operation unit are different, the transient of the power input to the vacuum cleaner It is possible to judge the operation state with high accuracy even in response to general changes, and not only to vacuum cleaners that are connected to a commercial power supply, but also to vacuum cleaners that are equipped with equipment such as batteries as a power source. In addition, the present invention is not limited to the vacuum cleaner, and is effective for the determination of the operation means of various devices having a configuration in which the power source is different.

The circuit block diagram of the vacuum cleaner in Embodiment 1 of this invention Operation means judgment value explanatory diagram of the same vacuum cleaner Illustration of voltage operation when the vacuum cleaner is powered off Illustration of voltage operation during momentary power failure of the vacuum cleaner Illustration of voltage operation during momentary power failure of the vacuum cleaner Flow chart of operation state determination of the vacuum cleaner Explanatory diagram of relationship between Vvolt and determination value of the vacuum cleaner Flowchart of operation determination of the vacuum cleaner in Embodiment 2 of the present invention Flowchart of operation determination of vacuum cleaner in Embodiment 3 of the present invention Overall perspective view of a conventional electric discharger Circuit diagram of the vacuum cleaner

Explanation of symbols

2 Electric blower 4 Operating means 11 Electric motor 15 Microcomputer 21 First power source 22 Second power source

Claims (7)

An operation unit that has at least an electric blower that generates suction air as a load, outputs a signal having a different voltage or current value, and a determination unit that determines an operation state of the operation unit based on a signal output from the operation unit A control unit that switches a control state of the load according to a determination result of the determination unit, a first power source that is a power source of the operation unit, and a determination value for determining the operation state of the operation unit in the determination unit A second power supply for supplying a reference voltage for setting the voltage, and voltage detection means for detecting the voltage of the first power supply, wherein the determination means is configured to detect the voltage according to the voltage detected by the voltage detection means. A vacuum cleaner that determines whether to switch the load control state or not. The electric vacuum cleaner according to claim 1, wherein the voltage of the first power source is set higher than the voltage of the second power source. The determination means, when the voltage detected by the voltage detection means is outside a predetermined voltage range, determines not to switch the control state of the load regardless of the signal output from the operation means. 2. The vacuum cleaner according to 2. When the voltage detected by the voltage detection means is outside a predetermined voltage range, the determination means determines at least not to switch the control state of the electric blower regardless of a signal output from the operation means. The electric vacuum cleaner according to claim 1 or 2. It has an electric motor that drives a rotating brush that is built in the suction tool as a load and sweeps up dust on the surface to be cleaned. When the voltage detected by the voltage detecting means is outside the predetermined voltage range, the operating means 5. The electric vacuum cleaner according to claim 1, wherein at least one of the control states of the electric motor is determined not to be switched regardless of a signal output from the electric vacuum cleaner. The control means has at least two control states of a stop state where the load is stopped and an operation state where the load is operated, and the determination means determines that the voltage detected by the voltage detection means is outside a predetermined voltage range. The control state is determined not to be switched when the signal output from the operation means is a switch from the stop state to the operation state. The vacuum cleaner according to item 1. The control means has at least two control states of a stop state where the load is stopped and an operation state where the load is operated, and the determination means determines that the voltage detected by the voltage detection means is outside a predetermined voltage range. The control state is determined not to be switched when the signal output from the operation means is a switch from the operation state to the stop state. The vacuum cleaner according to item 1.

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