JP4304135B2 - Vacuum cleaner control device - Google Patents

Description

  The present invention relates to a vacuum cleaner, and more specifically, for example, even if a manufacturing tolerance of the electric blower is large, the electric blower current detection and phase control control the electric blower input power with high accuracy, and The present invention relates to a control device for a vacuum cleaner that controls the input power of an electric blower with high accuracy even when there is a change in voltage of a commercial power supply.

  This type of conventional vacuum cleaner, for example, corresponds to the phase angle of the phase angle control means based on the phase angle-target current characteristic obtained in advance as a characteristic for obtaining the target input power in each region. A plurality of target currents are obtained, a target current corresponding to a region to which the phase angle belongs is selected from the plurality of target currents based on a previously obtained relationship, and the detected current of the current detection means is compared with the target current. The phase angle is increased or decreased based on the comparison result between the calculation means and the calculation means, and the phase angle control is performed so that the detection current of the current detection means matches the target current, and the target is set in any region. Some include phase angle control means for controlling the input power so as to be input (see, for example, Patent Document 1).

  Further, as another conventional electric vacuum cleaner, a current detection unit that converts a detection current of a current sensor into a level signal, a voltage detection unit that detects a power supply voltage, and an input of an electric blower based on the output of the current detection unit And a phase control means for controlling the electric blower so as to keep the input of the electric blower constant by increasing or decreasing the arc phase angle so that the level signal of the current detection means becomes constant. Using the relationship between the obtained input and the arc phase angle and the power supply voltage, the power voltage is indirectly obtained from the arc phase angle of the electric blower when the level signal is controlled to be constant. The signal level determination value for controlling the output of the current detection means to be constant from the power supply voltage is varied (for example, see Patent Document 2).

JP 2001-87189 A (page 3-6, FIGS. 1-7)

JP-A-7-213468 (page 3-4, FIG. 1, FIG. 6)

The vacuum cleaner described in Patent Document 1 has a fixed value at the boundary from region 1 to region 2, so that even if the input power tolerance of the electric blower is large, the target input power is obtained. It is possible to control. It is also possible to control the input power with a small input power tolerance so that it becomes the target input power.
However, this electric vacuum cleaner has not been considered for fluctuations in power supply voltage. For this reason, when the power supply voltage is smaller than 100 V and the transition from the region 1 to the region 2 occurs, the dust is not fully filled with an air volume larger than the assumed dust volume full display air volume. There was a problem that the full display was performed.

The vacuum cleaner described in Patent Document 2 controls the electric blower so as to keep the input constant, and uses the relationship between the input, the ignition phase angle, and the power supply voltage obtained in advance, and the signal of the current detection means. The power supply voltage is indirectly obtained from the ignition phase angle of the electric blower when the level is controlled to be constant, and the signal level judgment value for controlling the output of the current detecting means to be constant is varied from the obtained power supply voltage. I am doing so.
However, this vacuum cleaner also does not set the region transition phase angle in accordance with the change in the power supply voltage, so when the power supply voltage is low, it is displayed with a larger air volume than the assumed full dust display air volume. There was a problem that.

  The present invention has been made in order to solve such a problem, and provides a vacuum cleaner that can alleviate variations in the display of the full amount of dust by setting the region transition phase angle in accordance with fluctuations in the power supply voltage. With the goal.

The vacuum cleaner according to the present invention includes an electric blower that generates an attractive force using an AC power source as a power source, a current detection unit that detects a current flowing through the electric blower, and a voltage that detects a voltage applied to the electric blower. A detection means, a phase control means for controlling an input current by controlling a phase angle of a voltage applied to the electric blower, and a target that exists in each of the areas divided into a plurality according to the air volume Based on a phase angle-target current characteristic obtained in advance as a characteristic for obtaining input power, a target current corresponding to a phase angle of a voltage applied to the electric blower is obtained, and the detected current of the current detecting means and the target A calculation means for comparing the current, and a phase angle determination means for calculating the transition phase angle of the transition region based on the voltage detected by the voltage detection means based on the phase angle-target current characteristics, When the electric blower is driven at a preset initial phase angle, the phase angle control means is based on the difference between the detected current of the current detection means and the target current compared by the calculation means. The phase angle is increased or decreased so as to approach the target current, and when the target current reaches a region for transition according to the air volume, the transition phase angle based on the voltage calculated by the phase angle determination means The phase angle is controlled by

  In the present invention, as described above, the phase angle control means for controlling the input current by controlling the phase angle of the voltage applied to the electric blower is operated when the electric blower is driven at a preset initial phase angle. The electric motor based on a difference between a detected current of the current detecting means compared by the means and a target current based on a phase angle-target current characteristic obtained in advance as a characteristic for obtaining a target input power existing in each region. The phase angle is increased or decreased so that the current of the blower approaches the target current, and when the target current reaches an area for transition, phase angle control is performed with the transition phase angle based on the voltage calculated by the phase angle determination means. As a result, even when the power supply voltage fluctuates, it is possible to perform constant control of the input voltage for each region, and to calculate the region transition phase angle for each power supply voltage. There is an effect that it is possible to reduce an error of the cup display.

The maximum input power is determined for the electric blower for suction of the vacuum cleaner, and there is an upper limit and a lower limit for the input power when the air volume is 100%, and control is performed so as not to exceed the limit. There is a need. However, as described above, if sufficient power is supplied to the electric blower for suction near the maximum suction power, the maximum input power may be exceeded. It is desired to perform constant power control. Similarly, even when the air volume is 100%, it is desired to perform constant control with a value that does not exceed the upper limit value and the lower limit value of the input power of the regulation value while supplying sufficient power to the electric blower. Furthermore, it is desired to satisfy the constant control of the input power even if the input power varies due to the manufacturing tolerance of the electric blower and the voltage of the commercial power supply varies.
Therefore, constant control of input power will be described in the following embodiment.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a control device for a vacuum cleaner according to Embodiment 1 of the present invention, FIG. 2 is a characteristic diagram of air volume, current and input power of the electric blower of FIG. 1, and FIG. 3 is a diagram of FIG. 4 is a basic characteristic diagram showing the correlation between the phase angle of the electric blower and the power supply voltage, FIG. 4 is a basic characteristic diagram showing the correlation between the phase angle of the electric blower of FIG. 1 and the current, and FIG. 5 is a phase angle showing a partially enlarged view of FIG. It is explanatory drawing of a versus current characteristic.

In FIG. 1, an electric blower 6 of a vacuum cleaner includes a power plug 1 connected to a commercial AC power source, a power synchronization detection means 2, a power supply voltage detection means 3, a current detection means 4, and a bidirectional thyristor 5. And connected to a commercial AC power source.
The power supply synchronization detection means 2 detects, for example, a zero cross point of a commercial AC power supply. The power supply voltage detection means 3 detects a voltage applied to the electric blower 6. Furthermore, the current detection means 4 is a means for detecting the current flowing through the electric blower 6, and the current sensor 4a is connected in series with the electric blower 6 and detects it as a voltage by a voltage drop method using a current transformer or a shunt resistor. is there.

  The microcomputer 7 includes a microcomputer ROM 17 in which a predetermined time T1 for determining a phase angle, which will be described later, and an initial phase angle PWS are stored, and an arithmetic unit comprising a target value-current value comparison unit 10 and a calculation unit 11 12, phase angle control means 13, time measurement means 14, phase angle determination means 15, and step input control means 16.

  The basic characteristic 8 in FIG. 1 is obtained in advance by experiments or the like, and specifically has characteristics as shown in FIGS. This is an input power characteristic (measured by a measuring instrument not shown) and a current characteristic (measured by the current detection means 4) when the electric blower 6 is controlled by changing the phase angle by the phase angle control means 13 described later. is there. The phase angle vs. target current characteristic 9 is derived from the basic characteristic 8 described above, and is for controlling the input power (see FIG. 5).

  The calculation means 11 of the microcomputer 7 stores a plurality of phase angle versus target current characteristics 9 as an approximate expression, and calculates a target current value from the phase angle at a certain point of time by an approximate expression. The target value-current value comparison means 10 compares a plurality of target current values obtained by the calculation means 11 with the detection current of the current detection means 4. The phase angle control means 13 controls the phase angle of the voltage applied to the electric blower 6 based on the comparison result of the target value-current value comparison means 10. The phase angle determination unit 15 calculates the transition phase angle of the region based on the power supply voltage.

The step input control means 16 changes the phase angle from the phase angle (transition phase angle) PW1E_LT immediately before the transition in the region 1 to the reference phase angle PW1S-θb (θ2) transitioning to the region 2 in stages, and the phase angle Is set in the phase angle control means 13.
The time measuring means 14 starts measuring time when it detects an input of current from the current detecting means 4 by applying power to the electric blower 6, and the predetermined time T1 stored in the microcomputer ROM 17 has elapsed. Sometimes this is notified to the phase angle determination means 15. The phase angle determination means 15 obtains the phase angle after the predetermined time T1 has elapsed and sets it in the phase angle control means 13.

  The nonvolatile memory 18 connected to the microcomputer 7 is composed of, for example, an EEPROM, and stores various data necessary for the operation of the microcomputer 7. Note that the same data as the microcomputer ROM 17 may be stored in the nonvolatile memory 18. The display unit 19 displays, for example, an operation mode of the electric vacuum cleaner and a display when the amount of dust is full. The switch unit 20 inputs operation details of input switching and start / stop to the microcomputer 7.

Next, characteristic diagrams shown in FIGS. 2 to 5 will be described.
The solid line curve shown in FIG. 2 is the current, and the dotted line is the target input power. As shown in the characteristic diagram of the current and the target input power, the air volume is reduced to achieve constant control of the target input power. The target current may be set so as to slightly decrease as the value of the target current depends on the air volume and the characteristics of the electric blower 6. Need to be clarified. For this reason, the characteristics shown in FIGS. 3 and 4 (FIG. 5) were obtained through experiments.

FIG. 3 is the first phase angle-input power characteristic of the basic characteristics described above, in which the horizontal axis indicates the phase angle and the vertical axis indicates the input power. Further, seven parameters (100%>a>b>c>d>e> f) from the air volume of 100% (zero dust volume) to the air volume of f% (large dust volume) are set as parameters. Shown for each voltage variation (110V, 100V, 90V).
When the phase angle is 100%, the input power decreases as the phase angle increases, and also at the phase angle 0, the input power decreases as the air flow is reduced. Further, it is shown that the rate of decrease in input power increases as the phase angle increases as the air volume increases.

  4 is a phase angle-current characteristic of the second basic characteristic as described above, and FIG. 5 is a phase angle vs. target current characteristic partially enlarged from FIG. 4, and is detected by the current detection means 4 on the vertical axis. The horizontal axis indicates the phase angle. There are seven types of air volume parameters as in FIG. 3, and are described for each power supply voltage variation (110 V, 100 V, 90 V) due to manufacturing tolerances of the electric blower 6.

Using these characteristics, a target current calculation formula for realizing constant control of input power is obtained. The areas requiring constant control of the input power are two areas, that is, near the air volume of 100% (area 1a) and near the maximum suction work rate (area 2). Here, the target input near the air volume of 100% is obtained. A method for calculating a target current calculation formula for realizing each target input power will be described below with reference to FIG. 3, where the power is WL, for example, and the target input power near the maximum suction power is WH, for example.
Regions 1 and 2 in FIG. 3 indicate the time when the power supply voltage of the electric blower 6 is 100V. In addition, although each area | region at "110V" and "90V" is not shown in figure, it becomes a respectively different area | region.

  The air volume 100% to the air volume b shown in FIG. The air volume b is set with reference to the air volume that is not close to the air volume c that is the maximum air volume in the air volume range that is set near the maximum suction work rate as described below. If there is no allowance between the airflows, that is, if there is no allowance between the airflows to be increased from the airflow as the target input power WL to WH, the power will be increased rapidly at a time. This is because the input power can be increased step by step when there is a margin, so that a smooth transition of the input power can be obtained.

Here, as shown by the horizontal line in FIG. 3, for example, when WL is set as the target input power, the input set as the target from the intersection (WL100, WLa, WLb) between the set input power WL and the air volume 100% to the air volume b. Phase angles (θWLb, θWLa, θWL100) corresponding to the electric power and the air volume can be derived, respectively.
A phase angle range θWLb to θWL100 corresponding to the target input power WL is defined as a region 1a. The region 1 in FIG. 3 indicates a region from the air volume 100% to the air volume c near the maximum power point, and specifically, from θWL100 including the area 1a to the target input power WH described below. The phase angle range (θWHc to θWL100) up to the corresponding phase angle θWHc.

Next, in the phase angle-current characteristic region 1a shown in FIG. 4, the intersections (WL100, WLa, WLb) of the phase angles (θWLb, θWLa, θWL100) derived in FIG. When plotted, the phase angle versus target current characteristic IWL (CTM1) in region 1 (θWHc to θWL100) is obtained.
Part of this phase angle vs. target current characteristic corresponds to the target input power WL, and the input power at each air volume is constant. The characteristic IWL expressed by a linear equation is a target current calculation formula for the region 1, and the target current calculation formula for the region 1 can be expressed by a first-order approximation formula such as y = ax + b. However, y is a target electric current value, x is a phase angle, and a and b are each constant.

Next, an area where the work rate is the maximum is set. In other words, the vicinity of the maximum point of the suction work rate is a specific air volume range, and this air volume range depends on the characteristics of the electric blower 6. Here, it is assumed that the air volume range is air volume c to air volume f.
As in the case of the target input power WL, the target input power is set as a target by the intersections (WHc, WHd, WHe, WHf) of the WH set as the target input power and the air volume c to the air volume f (large dust volume). The phase angle (θWHc, θWHd, θWHe, θWHf) corresponding to the input power WH and the respective air volumes (c to f) can be derived.

Then, when the phase angles (θWHc, θWHd, θWHe, θWHf) derived in FIG. 3 and the intersections (WHc, WHd, WHe, WHf) of the respective air volumes are plotted on FIG. 4, the region 2 (θWHf to θWHc) The phase angle vs. target current characteristic at.
That is, a phase angle vs. target current characteristic IWH (CTM2) corresponding to the target input power WH and making the input power constant at each air volume is obtained.

This phase angle versus target current characteristic IWH is expressed by a quadratic equation as a target current calculation formula for region 2. The target current calculation formula of this region 2 can be expressed by a quadratic approximate formula such as y = ax 2 −bx + c. However, y is a target current value, x is a phase angle, and a, b, and c are constants.
In FIG. 4, the obtained phase angle vs. target current characteristics IWL (CTM1) and IWH (CTM2) do not become straight lines, but are curved to the right because the power factor of the electric blower 6 differs depending on the phase control. It is.

Next, FIG. 5 will be described.
CTM1-90, CTM1-100, and CTM1-110V are obtained, and plus offset (C +) and minus offset (C-) are obtained with CTM1-100 as a reference (offset zero).
Moreover, the method of calculating | requiring the approximate expression for offset value calculation can be calculated | required by the formula which substitutes the said offset amount to the approximate expression B term of CTM1-100 as FIG. As described above, by calculating by substituting the offset amount into the approximate expression B term of CTM1-100, setting CTM1 for each voltage fluctuation of each commercial power supply makes the input power constant even if the commercial AC power supply fluctuates. Control becomes possible.

The phase angle width θA (θ1) from the reference phase angle (PW1S) for each voltage to the phase angle PW1E (θWLb) at the boundary transitioning to the region 2 is θA (110 V) ≈θA (100 V) ≈θA (90 V) There is a relationship.
Therefore, by setting PW1E_LT at the time of each voltage fluctuation to a phase angle for shifting to the region 2, it is possible to shift to the region 2 due to variations in the voltage of the commercial power source 1.
The initial phase angle (PW2S) when the region 1 (θWLb) is shifted to the region 2 (θWHc) is PW1S (110V) −θB (110V), PW1S (100V) −θB (100V), PW1S (90V). There is a relationship of -θB (90V). Note that θB is a phase angle width corresponding to the predetermined phase angle θ2 of the present invention.

As the phase angle PW1E_LT at the boundary transitioning from the reference phase angle PW1S to the region 2, a value calculated in advance by the power supply voltage is used. A method for obtaining the expression of PW1E_LT is as shown in FIG. The reference voltage is set to 100V. When the voltage is lower than 100V, PW1E_LT is set to be small, and when the voltage is higher than 100V, the reference voltage is set to be high.
Therefore, when the voltage fluctuates, the phase angle PW1E_LT immediately before the transition to the region 2 is calculated, and the error of the dust full display can be reduced.

Next, operation | movement of the control apparatus of the vacuum cleaner of this Embodiment 1 is demonstrated using FIGS. 8-10. FIG. 8 is a flowchart showing the operation of the control apparatus according to the first embodiment of the present invention, FIG. 9 is a flowchart showing the operation of the reference phase angle calculation process, and FIG.
When the power supply ON by the operation of the switch unit 20 is detected (S200), the microcomputer 7 sends the initial phase angle PWS stored in the microcomputer ROM 17 (or the nonvolatile memory 18) to the phase angle control means 13 and the calculation means 11. Then, the predetermined time T1 stored in the microcomputer ROM 17 is set in the time measuring means 14 (S202). As shown in FIG. 5, the initial phase angle PWS is a phase angle θWL100 (100 V) at the intersection of the target current CTM1-100 and the characteristic curve of 100% air volume.

  The phase angle control means 13 drives the bidirectional thyristor 5 based on the set initial phase angle PWS, and controls the phase of the voltage applied to the electric blower 6 (S203). At this time, the current detection means 4 detects the current CT based on the phase control flowing through the electric blower 6 (S204) and sends it to the target value-current value comparison means 10 and the time measurement means 14 of the calculation means 12.

The calculation means 11 is based on the CTM1-100 of the target current characteristics (CTM1-100, CTM1-90, CTM1-110) obtained for each voltage based on the voltage of the commercial AC power supply detected by the power supply voltage detection means 3. The offset amount (see FIG. 14) at the detected voltage is calculated (S205).
Then, the offset amount (C +, C−) is substituted into the approximate expression B term of CTM1-100V, and the target current CTM1 (CTM1-90) for each voltage of the commercial AC power supply corresponding to the set initial phase angle value PWS. , CTM1-100, CTM1-110) are calculated (S206) and set in the target value-current value comparing means 10.

  On the other hand, the phase angle determining means 15 determines whether or not the calculation of the reference phase angle PW1S for determining the voltage fluctuation of the commercial power supply 1 is completed (S207), and when the calculation of the reference phase angle PW1S is completed. This is notified to the target value-current value comparing means 10, but when the calculation of the reference phase angle PW1S is not completed, the calculation process of the reference phase angle PW1S is started (S208).

  As shown in FIG. 9, this process determines whether or not the predetermined time T1 has passed through the time measuring means 14 (S116), and proceeds to S117 when the predetermined time T1 has passed, but the predetermined time T1 has passed. If not, the process waits (S116), and notifies the target value-current value comparing means 10 to that effect. The predetermined time T1 is a wait time provided when determining the reference phase angle PW1S, and is about 3 seconds. This wait time is a time required for the input of the electric blower 6 to be stabilized. By providing the wait time, the accuracy of the reference phase angle PW1S is increased.

  Upon receiving the notification, the target value-current value comparison means 10 compares the detection current CT of the current detection means 4 with the target current CTM1 (S111), and when this CT and CTM1 are not equal, the phase angle control means 13 However, when CTM1 (CTM1-100) and CT are equal, for example, the phase angle control operation of the electric blower 6 by the phase angle control means 13 is performed. Make it.

While the operation is repeated, when the measurement time of the time measurement unit 14 has passed the predetermined time T1, the phase angle determination unit 15 proceeds from S116 to S117 and clears the predetermined time T1 of the time measurement unit 14. Then, calculation of the reference phase angle PW1S is started (S118).
In this case, as shown in FIG. 3, since the target current CTM1 (point WL100 (100 V) at the initial phase angle PWS is equal to the detected current CT, the initial phase angle PWS is set as the reference phase angle PW1S. This is when the commercial AC power supply is 100V.

Thereafter, the phase angle PW1E_LT at the boundary transitioning from the reference phase angle PW1S to the region 2 is calculated from the voltage detected by the power supply voltage detection means 3 (S119), and then a predetermined phase angle θB from the reference phase angle PW1S. (100V) is subtracted to calculate the initial phase angle PW2S when the region 1 is shifted to the region 2 (S120), and the above-described calculation process is terminated.
Then, although not shown, the phase angle PW1E_LT is set in the calculation means 11, and then it is determined whether or not the phase angle controlled by the phase angle control means 13 has reached the phase angle PW1E_LT. (S209). Then, when the phase angle controlled by the phase angle control means 13 reaches the phase angle PW1E_LT, a transition to the region 2 is made.

  Further, when the phase angle determination unit 15 is on standby until the predetermined time T1 has elapsed, the reference phase angle PW1S is not calculated, so that the target value-current value comparison unit 10 When it is determined that the detected current CT is not equal to the target current CTM1 at the initial phase angle PWS, the magnitudes of CT and CTM1 are compared (S213), and the comparison result is notified to the phase angle control means 13.

When the detected current CT is larger than the target current value CTM1, the phase angle control means 13 increments the initial phase angle PWS by 1 hex (hex: 1 hex, equivalent to 1 hex = 1 degree) (S215), and the phase angle Then, the control operation is performed (S203). This operation is repeated while CT is larger.
On the other hand, each time the initial phase angle PWS is incremented by 1 hex by the phase angle control means 13, the calculation means 11 calculates the target current CTM1 based on the phase angle and notifies the target value-current value comparison means 10. This operation is repeated until the calculated target current CTM1 is equal to the detected current CT each time.

  On the other hand, when the passage of the predetermined time T1 is confirmed through the time measuring unit 14, the phase angle determining unit 15 sets the phase angle at the time of calculating the target current CTM1 equal to the detected current CT as the reference phase angle PW1S (point WL100 (110V)). (S118) This is when the commercial AC power supply is 110V.

  Thereafter, as described above, the phase angle PW1E_LT at the boundary transitioning from the reference phase angle PW1S to the region 2 is calculated from the voltage (point WLb (110V)) (S119), and then predetermined from the reference phase angle PW1S. The obtained phase angle θB (110 V) is subtracted to calculate the initial phase angle PW2S when the region 1 is shifted to the region 2 (S120), and the above-described calculation process is terminated. Then, similarly to the above, the phase angle PW1E_LT is set in the calculating means 11, and then it is determined whether or not the phase angle controlled by the phase angle control means 13 has reached the phase angle PW1E_LT ( S209).

Similarly to the above, when the phase angle determining means 15 is on standby until the predetermined time T1 has elapsed, the target value-current value comparing means 10 determines that the target current CTM1 is larger than the detected current CT. At this time, the phase angle control means 13 decrements 1 hex (hex: 1 hex, corresponding to 1 hex = 1 degree) from the initial phase angle PWS (S214).
On the other hand, the phase angle determination unit 15 compares the decremented phase angle with PW1E_LT which is a limiter value that shifts from the region 1 to the region 2.

When the phase angle is smaller than the limiter value, the initial phase angle PW2S is set in the phase angle control means 13 (S210), but when the phase angle is larger than the limiter value, this is indicated. Notify
At this time, the phase angle control means 13 controls the electric blower 6 with a phase angle decremented by 1 hex from the initial phase angle PWS. This operation is repeated while the target current CTM1 is larger.

  On the other hand, every time the initial phase angle PWS is decremented by 1 hex by the phase angle control means 13, the calculation means 11 calculates the target current CTM1 based on the phase angle and notifies the target value-current value comparison means 10. This operation is repeated until the calculated target current CTM1 is equal to the detected current CT each time.

  When the passage of the predetermined time T1 is confirmed through the time measuring unit 14, the phase angle determining unit 13 sets the phase angle when calculating the target current CTM1 equal to the detected current CT as the reference phase angle PW1S (point WL100 (90V)) ( S118). This is when the commercial AC power supply is 90V. Thereafter, as described above, the phase angle PW1E_LT at the boundary transitioning from the reference phase angle PW1S to the region 2 is calculated from the voltage (point WLb (90 V)) (S119).

  Next, a predetermined phase angle θB (90 V) is subtracted from the reference phase angle PW1S to calculate an initial phase angle PW2S when the region 1 is shifted to the region 2 (S120), and the above-described calculation process is ended. . Then, similarly to the above, the phase angle PW1E is set in the calculating means 11, and then it is determined whether or not the phase angle controlled by the phase angle control means 13 has reached the phase angle PW1E ( S209).

When the phase angle determination unit 13 confirms that the phase angle controlled by the phase angle control unit 13 has not reached the phase angle PW1E_LT, the phase angle determination unit 13 waits until the phase angle reaches the phase angle PW1E_LT.
At this time, the calculation means 11 calculates the target current CTM1 based on the set phase angle PW1E and sets it in the target value-current value comparison means 10, and the target value-current value comparison means 10 It is determined whether or not the target current CTM1 is equal (S212).

  When the detected current CT and the target current CTM1 are not equal and the target current CTM1 is larger than the detected current CT (S213), the phase angle control means 13 calculates 1 hex from the initial phase angle PWS (hex: hexadecimal, 1 hex = 1 (corresponding to 1 degree) is decremented (S214). On the other hand, the phase angle determining means 15 compares the decremented phase angle with the limiter value for shifting from the region 1 to the region 2 (S216).

  When the phase angle is smaller than the limiter value, the initial phase angle PW2S is set in the phase angle control means 13 (S210), but when the phase angle is larger than the limiter value, this is indicated. Notify At this time, the phase angle control means 13 controls the electric blower 6 with the phase angle decremented by 1 hex from the initial phase angle PWS (S203). This operation is repeated until the phase angle controlled by the phase angle control means 13 reaches the target current CTM1 (PW1E).

  When the phase angle reaches the target current CTM1 (PW1E_LT) by repeating this operation, the phase angle determination unit 13 sets the initial phase angle PW2S of the region 2 in the step input unit 16 (S210). At this time, the step input means 16 sets, for example, the phase angle from the PW1E_LT to the reference phase angle −θB (that is, PW2S) to the phase angle control means 13 at a predetermined time and in a stepwise manner. The electric blower 6 is controlled through the phase angle control means 13. Then, when this control is finished, the processing in the area 2 is started (S211).

  The processing in the region 2 is the initial phase angle PW2S at the stage of entering the region 2, and then the calculation unit 11 calculates the fixed phase angle PW2E in the region 2. As shown in FIGS. 11 and 12, this is based on the current value at the phase angle 0 point at WHf (100V) as a reference, the phase angle θHf (105V) at WHf (105V) and the phase angle at WHf (110V). θHf (110 V) is obtained (S219). This is calculated based on the phase angle-current characteristics of FIGS. 4 and 5 until the voltage reaches 100V to 110V, but when it reaches 110V, it is fixed to the values shown in FIGS. 10 and 11. means. At 90V, the fixed phase angle PW2E is calculated as PW2E = 0 which is the maximum input.

Before entering the process of region 2, the phase angle determination unit 15 determines whether or not the phase angle changed stepwise by the step input unit 16 in S210 exceeds PW2S + θPWX2 (S220).
This is a judgment for returning to the region 1 when the air volume becomes 100% at the time of transition to the region 2, and θPWX2 is a predetermined value (that is, for calculating a phase angle for transition from the region 2 to the region 1). Is stored in the microcomputer ROM 17 or the nonvolatile memory 18. Here, the case of transition from region 2 to region 1 means that, for example, when a carpet having a long bristle is cleaned in the state of region 1, the transition is temporarily made to region 2, but the cleaning floor moves to flooring or the like. In this case, the operation returns from the region 2 to the region 1.

  When the phase angle value exceeds PW2S + θPWX2, the reference phase angle PW1S is set in the phase angle control means 13 (S221), and the process of region 1 is started. In this case, the process starts from S203. Further, when the phase angle value is equal to or smaller than PW2S + θPWX2, the processing of region 2 is started. Then, this is notified to the target value-current value comparing means 10.

  In this case, since the process of the region 2 is entered, the target value-current comparison unit 11 compares the set target current value CTM2 with the detected current CT (S223). When CTM2 and CT are equal, the phase angle determining means 15 determines again whether or not the phase angle exceeds PW2S + θPWX2 (S220). While repeating these operations, when the CT becomes larger than the CTM2 in S224, the phase angle control means 15 increments the initial phase angle PW2S by 1 hex (S215), and the control operation is performed at the phase angle. do.

  Further, the phase angle determination means 15 determines whether or not the phase angle value has become 0 when the CT becomes smaller than the CTM2 in S224 (S225). If the phase angle value is not 0, the phase angle control means 13 decrements the phase angle by 1 hex (hex: hexadecimal, 1 hex = 1 degree) (S226). At this time, the phase angle control means 13 controls the electric blower 6 with the decremented phase angle.

  On the other hand, when the phase angle is 0, the fixed phase angle PW2E is compared with the phase angle (S228). When the phase angle is larger than PW2E, the process returns to S220. When the phase angle is equal to or less than PW2E, it is determined that the voltage is over 100V from the commercial power source 1, and PW2E is set as the phase angle (S229). Return to S220. At this time, the phase angle control means 13 controls the phase so that the target current CTM2 is 100V.

As described above, according to the first embodiment, characteristics as shown in FIG. 13 are obtained. That is, by using the offset value to make CTM1 correspond to fluctuations in each voltage of the commercial AC power supply and to make PW1E_LT correspond to fluctuations in each voltage, the input power is kept constant even if the voltage of the commercial AC power supply changes. Control became possible.
Further, when the power supply voltage is 90 V, PW1E_LT in the region 1 is made smaller than PW1E_LT when the reference voltage is 100 V, thereby delaying the transition to the region 2 and reducing the error in the variation in the air volume of the dust full display. Furthermore, when the power supply voltage is 110V, the fixed phase angle in the region 2 is increased to make the input power the same as when the voltage is 100V, thereby reducing the error in the variation of the dust full display air volume. .

Embodiment 2. FIG.
FIG. 14 is a characteristic diagram of PW1E_LT obtained by the control device for a vacuum cleaner according to Embodiment 2 of the present invention.
In the second embodiment, in the calculation of PW1E_LT, a fixed value is set near 100 V as shown in FIG. By doing so, the value of PW1E_LT can be left unchanged when the change in the power supply voltage is small.

  As described above, according to the second embodiment, when the voltage of the commercial power supply 1 is slightly changed, the transition phase angle to the region 2 does not change, and the variation in the air volume of the dust full display is reduced. It becomes possible.

The block diagram which shows the structure of the control apparatus of the vacuum cleaner which concerns on Embodiment 1 of this invention. The characteristic figure of the air volume of an electric blower, electric current, and input electric power. The basic characteristic figure which shows the correlation of the phase angle of an electric blower, and input electric power. The basic characteristic figure which shows the correlation of the phase angle of an electric blower, and an electric current. Explanatory drawing of the phase angle versus target current characteristic which shows FIG. 4 partially enlarged. Explanatory drawing of the approximate expression of offset value calculation. Explanatory drawing of the approximate expression of PW1E_LT calculation. The flowchart which shows operation | movement of the control apparatus of the same vacuum cleaner. The flowchart which shows operation | movement of a reference | standard phase angle calculation process. 7 is a flowchart showing the operation of region 2. Explanatory drawing for calculating the phase angle fixed value (PW2E) when the voltage at the time of transition to region 2 is 100 V or more. Explanatory drawing of the approximate expression for a fixed phase angle (PW2E) calculation. FIG. 3 is a characteristic diagram with respect to voltage fluctuation of the commercial power source obtained by the first embodiment. The characteristic view of PW1E_LT obtained by the control apparatus of the vacuum cleaner which concerns on Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power plug, 2 Power supply synchronous detection means, 3 Power supply voltage detection means, 4 Current detection means, 5 Bidirectional thyristor, 6 Electric blower, 7 Microcomputer, 10 Target value-current value comparison means, 11 Calculation means, 12 Computation Means, 13 phase angle control means, 14 time measurement means, 15 phase angle determination means, 16 step input control means, 17 microcomputer ROM, 18 nonvolatile memory, 19 display section, 20 switch section.

Claims (6)

An electric blower that generates an attractive force using an AC power source as a power source;
Current detecting means for detecting a current flowing through the electric blower;
Voltage detection means for detecting a voltage applied to the electric blower;
Phase control means for controlling the input current by controlling the phase angle of the voltage applied to the electric blower;
A voltage applied to the electric blower based on a phase angle-target current characteristic that is obtained in advance as a characteristic for obtaining a target input power that exists in each of the areas divided into a plurality of areas according to the air volume. Calculating means for calculating a target current corresponding to the phase angle of the current, and comparing the detected current of the current detecting means and the target current;
A phase angle determination unit that calculates a transition phase angle of a transition region based on the voltage detected by the voltage detection unit based on the phase angle-target current characteristic;
When the electric blower is driven at a preset initial phase angle, the phase angle control means is based on the difference between the current detected by the current detection means and the target current compared by the calculation means. The phase angle is increased or decreased so as to approach the target current, and when the target current reaches a region for transition according to the air volume, the transition phase angle based on the voltage calculated by the phase angle determination means A control device for a vacuum cleaner, characterized in that the phase angle is controlled by a vacuum cleaner. The area divided into a plurality according to the air volume includes an area 1 corresponding to the vicinity of 100% of the air volume and an area 2 corresponding to the maximum suction work factor, and the phase angle-target current characteristics are respectively in the respective areas. 2. The control device for a vacuum cleaner according to claim 1, wherein the control device has a characteristic for realizing a target input power constant control. Transition phase angle to the region 2 in which the phase angle determining means for calculating, when the voltage detected by the voltage detecting means has detected is lower than the reference voltage is less than the transition phase angle of said reference voltage, said voltage detecting means detects 3. The control device for an electric vacuum cleaner according to claim 2, wherein when the measured voltage is higher than the reference voltage, the voltage becomes larger than a transition phase angle of the reference voltage. Claim transition phase angle to the region 2, when the voltage detected by the voltage detecting means has detected reaches the reference voltage, characterized in that the transition phase angle of said reference voltage, wherein the phase angle determining means for calculating 3. A control device for an electric vacuum cleaner according to 3. The relative transition phase angle to the region 2 where the phase angle determining means has calculated, instructs the set to the phase angle control means so as to the stepwise changes from region 1 to the region 2 to transition immediately before transitioning The control apparatus of the vacuum cleaner in any one of Claims 2-4 provided with the step input control means to do. In the region 2, when the voltage detected by the voltage detection unit is higher than a reference voltage, the calculation unit uses the phase angle calculated based on the phase angle-target current characteristic corresponding to the reference voltage as a fixed phase angle. It is calculated and input to the phase angle control means, and when the voltage detected by the voltage detection means is lower than a reference voltage, a phase angle of 0 is set and input to the phase angle control means. control apparatus for an electric cleaner according to any one of claims 2-5.

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