JP2007130158A - Vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce fluctuation in a power consumption caused by fluctuation in a winding wire impedance in an individual fan motor using a simple circuit constitution. <P>SOLUTION: This vacuum cleaner has a preparation mode storing a correction value for correcting a load current value which is detected in a current detection part 3 in a cleaning mode. In the cleaning mode, a microprocessor 7 corrects the load current value detected by the current detection part 3 based on the correction value stored in the preparation mode, compares a load current correction value calculated based on the corrected load current value with a threshold value, controls a timing of a trigger signal output to a switching element for making the power consumption of the motor 5 within a preset value according to the error, and controls the power consumption of the motor 5 within the prescribed value. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vacuum cleaner provided with a fan motor driven by an AC power supply.

  In a vacuum cleaner equipped with a fan motor driven by an AC power supply, the load current flowing through the fan motor is detected by current detection means, and phase control is performed based on the detected current value to adjust the power consumption of the vacuum cleaner. It was.

  However, since the characteristics of the current detectors vary, the detected current values also vary. Therefore, it is necessary to adjust the power consumption according to variations in the characteristics of the current detector (first example).

  In addition, since the fan motor has windings and has inductive characteristics, there is a phase difference between voltage and current. In addition, there is a variation in winding impedance between individual fan motors. For this reason, even if the load currents flowing through the fan motors are the same, a phenomenon occurs in which the power consumption differs due to the difference in voltage, current and phase difference between the individual fan motors. For this reason, even if a predetermined voltage is applied to the fan motor, the power consumption varies among the individual fan motors. Therefore, it is necessary to adjust the variation in the power consumption (second example).

Patent Documents 1 and 2 disclose an invention for adjusting the variation in power consumption as in the first and second examples. In these documents, a wattmeter is connected to a vacuum cleaner and a motor is driven with a predetermined power, and then a threshold value to be compared with a detected current is corrected for phase control, or a detected current value is stored. Adjustment is performed by storing a correction value for correction.
JP 09-122052 A JP 2000-166833 A

  However, in the above publication, the power consumed by the vacuum cleaner is set to a predetermined value in order to store the corrected threshold value or to store the corrected value for correcting the detected current value. Therefore, the phase angle had to be adjusted based on the output of the wattmeter.

  For this reason, it is not easy to adjust the variation in power consumption in Examples 1 and 2.

  An object of the present invention is to provide a vacuum cleaner that can reduce variations in power consumption of a vacuum cleaner caused by variations in current detection units and winding impedance variations in individual fan motors using a simple circuit configuration. There is to do.

  The present invention includes an electric blower comprising a motor connected to an AC power supply via a switching element driven by a control signal and a fan connected to the motor, a control unit for supplying a control signal to the switching element, In a vacuum cleaner comprising a zero-cross detection unit that detects a zero-cross timing of an AC voltage applied to a motor and a current detection unit that detects a load current flowing through the motor, the control unit sets the operation mode to a predetermined value. The operation mode setting means for setting the preparation mode for outputting the control signal at the output timing or the cleaning mode for making the output timing of the control signal variable, and the load current value detected by the current detection unit in the preparation mode. Storage means for storing a correction value based on the load current detected by the current detector in the cleaning mode. Load current instantaneous value capturing means that samples at a constant sampling cycle and captures it as an instantaneous load current value, function value output means that outputs a sine function value according to the load current sampling period, and the load current instantaneous value capture means Trigger output to the switching element with reference to the instantaneous load current value taken in, the correction value stored in the preparation mode, the sine function value output by the function value output means, and the preset threshold value Timing determining means for determining the timing of the signal.

  According to the present invention, the variation of the current detection unit can be adjusted in the preparation mode, and the variation of the winding impedance of the fan motor can be adjusted in the cleaning mode. Can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The configuration of the electric vacuum cleaner will be described with reference to FIG. In the vacuum cleaner main body 21, a lower case 22 having an upper surface opened and an upper case 23 closing the rear upper surface of the lower case 22 are joined to a peripheral edge including a front surface with a bumper 24 interposed therebetween. And the cover body 25 which obstruct | occludes opening of a front side upper surface part is provided so that opening and closing is possible. Further, the lid 25 is formed with a notification unit 40 for notifying the user of the state of the vacuum cleaner. The notification unit 40 includes a light emitting element such as an LED, a sound generation element, and the like.

  The electric vacuum cleaner main body 21 is provided with an electric blower 26 and a dust collection bag 27 as a dust collecting part inside, and the dust collection bag 27 allows the intake air of the electric blower 26 to pass through the dust collection bag 27. Is separated and collected.

  A swiveling wheel (not shown) that can turn freely is provided on the lower surface on the front side that is the traveling direction of the electric vacuum cleaner main body 21. Further, a large-diameter driven rear wheel 28 is provided on the rear side surface of the vacuum cleaner main body 21.

  A main body suction port 29 that sucks air from the outside is opened at the front center of the vacuum cleaner main body 21. Then, one end of a substantially cylindrical hose body 30 that is extendable and bendable is connected to the main body suction port 29 in communication. The other end of the hose body 30 communicates with the hand operation unit 31.

  The hand operating unit 31 is provided with an operation button 32 for selecting the operation of the electric blower 26 including “OFF”, and a grip 33 for a worker to grip when cleaning. An extension pipe 34 is detachably communicated with the distal end of the hand operation section 31, and the extension pipe 34 and the hose body 30 communicate with each other via the hand operation section 31. The extension pipe 34 includes a large diameter pipe 34a and a small diameter pipe 34b inserted into the large diameter pipe 34a, and the entire extension pipe can be expanded and contracted by sliding the small diameter pipe 34b with respect to the large diameter pipe 34a. And the floor brush member 35 which provided the suction inlet which sucks the dust on a to-be-cleaned surface in the front-end | tip of this extension pipe 34 is attached so that attachment or detachment is possible. A circuit board 101 on which a control unit 10 that controls the vacuum cleaner is mounted is incorporated in the main body 21 of the vacuum cleaner.

  Next, the vacuum cleaner control device 100 including the control unit 10 will be described with reference to FIG. The commercial AC power source 1 is driven by a switching element driven by a trigger signal, for example, a bidirectional three-terminal thyristor 2 (hereinafter referred to as “three-terminal thyristor 2”), a current detector 3, a current fuse 4, and an AC power source. The brushed motor 5 is connected in series.

  The electric blower 26 is mainly composed of the brushed motor 5 and the fan 13. The motor 5 with a brush is a universal motor comprised from the brush (not shown), the armature 5a provided with the commutator, and the field winding 5b, 5c, for example. The fan 13 is a centrifugal fan connected to the rotating shaft of the brushed motor 5. The current detection unit 3 includes, for example, a current transformer or a Hall element, and detects a load current flowing through the brushed motor 5.

  The zero cross point of the AC power supply voltage applied to the brushed motor 5 is detected by the zero cross detection unit 6.

  The control unit 10 includes a microprocessor 7, a memory 8, and an I / O port 9 having an A / D conversion function. The memory 8 includes a memory 8a and a nonvolatile memory 8b. The nonvolatile memory 8b stores in advance data such as a control program executed by the microprocessor 7 and necessary constants. On the other hand, the memory 8a is a data storage area and a work area for temporarily storing data of the nonvolatile memory 8b, operation data of the microprocessor 7, and the like.

  The load current detected by the current detection unit 3 is rectified by the rectification unit 11 configured by a diode or the like, converted into a voltage value, and input to the I / O port 9. The rectifier 11 is, for example, a full-wave rectifier circuit in which four diodes are bridge-connected, or a half-wave rectifier circuit using one diode. Since the voltage input to the I / O port 9 is not smoothed by an electrolytic capacitor or the like, the waveform has a periodicity corresponding to the AC voltage. The I / O port 9 takes in an analog load current value after digital conversion. Further, the zero cross detection unit 6 inputs the detected zero cross detection signal to the I / O port 9.

  In addition, an instruction signal or the like from the hand operating unit 31 is input to the I / O port 9.

  The control unit 10 captures load current, captures zero-cross timing, captures an instruction signal, and the like, and outputs a control signal serving as a trigger to the gate terminal of the three-terminal thyristor 2.

  In this vacuum cleaner control device 100, a power supply voltage having the waveform shown in FIG. 3A is applied from the commercial AC power supply 1, and the gate terminal of the three-terminal thyristor 2 is shown in FIG. When the control signal is supplied at the timing, the three-terminal thyristor 2 becomes conductive until the power supply voltage is inverted by the control signal, so that the voltage shown in FIG. 3D is generated between the terminals of the electric blower 26.

  At this time, the zero-cross detection signal shown in FIG. 3B is input from the zero-cross detection unit 6 to the I / O port 9 of the control unit 10. Assuming that the cycle of the AC voltage is Tv (sec) and the time from the zero cross timing of the AC voltage to the output of the control signal is t (sec), the conduction angle φ (%) of the three-terminal thyristor 2 is φ = {( Tv / 2) 1 t} / (Tv / 2) × 100. Hereinafter, the time t (sec) from the zero cross point of the power supply voltage until the control signal is output is referred to as a delay time.

  Moreover, when the rectifier 11 is a full-wave rectifier circuit, the waveform of the load current value of the electric blower 26 input to the I / O port 9 is as shown in FIG. The waveform of the load current value when the rectifying unit 11 is a half-wave rectifier circuit is, for example, as shown in FIG. Thus, since the waveform of the load current value input to the I / O port 9 is not smoothed by an electrolytic capacitor or the like, the waveform has a periodicity.

  Next, each function of the control unit 10 will be described with reference to FIG. The control unit 10 mainly includes an operation mode recognition unit (operation mode setting means) 42, an instantaneous load current value acquisition unit 51, a load current maximum value determination unit 52, a function value output unit 52a, a total value calculation unit 53, and timing determination. Section 54 and load current maximum value error calculation section 55. The operation mode recognition unit 42 recognizes the voltage of the operation mode switching unit 41 and switches the operation mode of the control unit 10 itself to the preparation mode or the cleaning mode. The cleaning mode is an operation mode of the control unit 10 when the vacuum cleaner user normally uses. On the other hand, the preparation mode is executed before product shipment, and is an operation mode of the control unit 10 that the user of the vacuum cleaner does not touch.

  In the preparation mode, for example, a reference electric blower, a resistance load, or an electronic load whose electric characteristics are previously grasped is prepared as a reference load and connected to the vacuum cleaner control device 100. Then, the timing determination unit 54 outputs a control signal with a predetermined delay time set in advance.

  Then, the load current instantaneous value acquisition unit 51 acquires the load current instantaneous value In detected from the current detection unit 3 at a preset sampling cycle, and passes the load current instantaneous value In to the load current maximum value determination unit 52. . The load current maximum value discriminating unit 52 compares the load current instantaneous values (I1, I2,..., In) sampled a predetermined number of times with the zero cross timing as a base point, and obtains the load current maximum value Iz therefrom. Then, this load current maximum value Iz is passed to the load current maximum value error calculation unit 55. The load current maximum value error calculation unit 55 compares the load current maximum value Iz with a preset load current maximum reference value Ip, obtains a correction value Id according to the error, and calculates the correction value Id as a non-volatile memory. 8b is stored. The correction value Id is obtained from a data table or a mathematical expression. The calculation cycle of the load current maximum value Iz is, for example, a half cycle of the AC power supply voltage in the case of FIG. 3E and one cycle of the AC power supply voltage in the case of FIG.

  Next, in the cleaning mode, the load current instantaneous value capturing unit 51 acquires the load current instantaneous value In detected from the current detection unit 3 at a predetermined sampling period, and passes it to the total value calculation unit 53. The function value output unit 52 a acquires the sine function value An according to the number of samplings of the load current instantaneous value In and passes the sine function value An to the total value calculation unit 53.

  The function of the total value calculation unit 53 is to correct the load current instantaneous value In with the correction value Id to obtain the load current correction value Ind, and multiply the load current correction value Ind by the sine function value An to correct the load current phase. The value Jn is calculated. Then, the load current phase correction value Jn is added by a predetermined number of samplings to calculate the load current correction total value Jsum, and the load current correction total value Jsum is passed to the timing determination unit 54. The timing determination unit 54 compares the load current correction total value Jsum with the load current set value Ig which is a preset threshold value to obtain an error, calculates a delay time instruction value ts from the error, A trigger signal is output according to the instruction value ts.

  In the preparation mode, the load current maximum value discriminating unit 43 stores the load current maximum value Iz in the nonvolatile memory 32b. In the cleaning mode, the load current maximum value error calculating unit 46 performs the load current maximum value Iz. And a preset load current maximum reference value Ip, a load current error Id is obtained according to the error, and the load current error Id can be output to the load current calculation unit 44. Then, the timing determination unit 45 compares the load current error Id with the load current lower limit value Ig1 and the load current upper limit value Ig2 which are preset current comparison values, and calculates the delay time command value ts from the comparison result. A control signal is output according to the command value ts. In this case, the load current maximum value Iz itself constitutes a correction value.

  Next, the data table 16 set in the memory 8 of the control unit 10 will be described. The data table 16 shown in FIG. 5 is an example of a data table showing the relationship between the delay time command value ts and the load current lower limit value Ig1 and the load current upper limit value Ig2, which are threshold values.

  First, each value of the data table 16 will be described. In the data table 16, n + 1 set values U0, U1, U2,..., Un (where Un <... <U2 <U1 <U0) are set as delay time command values ts that are output timings of control signals. As the load current lower limit value Ig1 corresponding to the delay time command value ts, n set values X1, X2, X3,..., Xn (Xn>...> X3> X2> X1 are satisfied. In the same manner, n set values Y1, Y2, Y3,..., Yn (where Yn...> Y3> Y2> Y1) are set as the load current upper limit value Ig2. As shown in FIG. 6, the magnitude relationship between these load current lower limit value Ig1 and load current upper limit value Ig2 is as follows: X1 <X2 <Y1 <X3 <Y2 <X4 <Y3 <X5 <Y4 <..., Xn <Yn−1 <Yn.

  The vacuum cleaner control device 100 (see FIG. 2) drives the electric blower 26 by outputting a control signal serving as a trigger from the control unit 10 to the three-terminal thyristor 2. And the control part 10 sets delay time command value ts to U0 so that the intake air volume of the electric blower 26 becomes QO or more in the state where dust is not captured in the dust bag 27. At this time, for example, the operating point of the electric blower 26 is point A in FIG.

  In this state, the electric blower 26 is driven to start cleaning, whereby dust is captured in the dust bag 27. As dust capture progresses, the air path resistance of the dust bag 27 increases, and the intake air volume of the electric blower 26 decreases. Along with this, the load current correction total value Jsum gradually decreases from the point A toward the set value X1 of the load current lower limit value Ig1.

  When the load current correction total value Jsum becomes equal to or less than the set value X1 of the load current lower limit value Ig1, the delay time command value ts that determines the timing for outputting the control signal is changed from U0 to U1, and the three-terminal thyristor 2 is changed. The conduction angle is increased and the intake air volume of the electric blower 26 is increased. At this time, the load current correction total value Jsum becomes Y1, and the input power of the electric blower 26 increases.

  Thereafter, as dust capture progresses, the dust collection bag 27 air path resistance further increases and the intake air volume of the electric blower 26 decreases. As a result, the load current correction total value Jsum gradually decreases toward the set value X2 of the load current lower limit value Ig1.

  Then, when the load current correction total value Jsum becomes equal to or less than the set value X2 of the load current lower limit value 1, the delay time command value ts for determining the timing for outputting the control signal is changed from U1 to U2, and the three-terminal thyristor 2 is changed. The conduction angle is further increased, and the intake air volume of the electric blower 26 is increased. At this time, the load current correction total value Jsum becomes Y2, and the input power of the electric blower 26 increases.

  As described above, as the dust trapping in the dust collection bag 27 proceeds, the load current correction total value Jsum becomes less than the set values X1, X2, X3, X4,... Of the load current lower limit value Ig1, respectively. The delay time command value ts is changed to U0, U1, U2, U3,. Then, after the load current correction total value Jsum becomes equal to or less than the set value Xn of the load current lower limit value Ig1 and the delay time command value ts is set to Un, the delay time is reduced even if the load current correction total value Jsum decreases. The command value ts is not changed.

  Further, in this state, when the dust collection into the dust collection bag 27 proceeds and the load current correction total value Jsum decreases, the control unit 10 determines that the dust collected in the dust collection bag 27 is almost full, A signal is output to the notification unit 40 to prompt the user of the vacuum cleaner to replace the dust bag 27.

  Next, each control routine will be described.

  The control unit 10 performs main processing shown in FIG. 7 according to a control program stored in advance in the memory 8. In this main process, first, various initial settings of the vacuum cleaner are performed in step S1. In step S2, the voltage of the operation mode switching unit 41 is determined. If the voltage is not V1, the vacuum cleaner is set to the preparation mode (step S3). Then, a control signal is output with a certain delay time (step S4), and a preparation mode main loop described later with reference to FIG. 8 is executed (step S5). When this preparation mode is executed, the fact that the preparation mode has been executed is stored as will be described later. For example, a flag indicating that the preparation mode has been executed is set in the nonvolatile memory 8b. In addition, a signal is output to the notification unit 40, for example, blinking an LED to notify that the preparation mode has ended.

  The notification unit 40 notifies the user that the dust trapped in the dust bag 27 is almost full in the cleaning mode, and notifies the notification unit 40 that the preparation mode has ended. Therefore, it is possible to eliminate the need to provide a notification unit that notifies that the preparation mode has ended, and to reduce space and cost.

  On the other hand, if it is determined in step S2 that the voltage is V1, the vacuum cleaner is set to the cleaning mode in step S6. Next, it is determined whether the preparation mode has been executed (step S7). This determination is made based on whether a flag indicating that the preparation mode has been executed is set in the nonvolatile memory 8b.

  If “YES” is determined in the determination in step S7, the main loop of the cleaning mode described later with reference to FIG. 9 is executed (step S8). That is, if the operation has never been performed in the preparation mode, the main loop in the cleaning mode is not executed.

  As described above, since the cleaning mode is executed only when the preparation mode is surely executed, it is possible to reliably adjust the variation of the current detection unit.

  Next, preparation mode processing executed before product shipment will be described with reference to the flowcharts of FIGS. First, in step S10, it is confirmed that a preset time has elapsed using a timer (not shown) or the like. Next, in step S11, the load current instantaneous value capturing unit 51 captures the load current instantaneous value In from the A / D conversion function-equipped I / O port 9.

  Next, in step S12, the number of times the load current instantaneous value In is captured is counted as the number of current value captures. This resetting of the number of times of capture is the zero cross timing of the AC power supply voltage detected by the zero cross detection unit 6. The sampling period of the load current instantaneous value In is set in advance. For example, if the current sampling cycle is set to 0.2 msec under a 50 Hz AC power supply, the current is sampled 50 times during the half cycle (10 msec) of the power supply voltage. Therefore, when the load current instantaneous value In is counted 50 times, a half cycle of the AC power supply voltage is completed, and this cycle is a calculation cycle of a correction value stored in the nonvolatile memory 8b. If sampling is performed 100 times under the same conditions, one cycle of the AC power supply voltage becomes the calculation cycle of the correction value stored in the nonvolatile memory 8b.

  Through the above processing, the load current instantaneous value In is sampled.

  Next, the operation in the preparation mode for storing the correction value Id in the nonvolatile memory 8b will be described with reference to the flowchart in FIG.

  First, in step S21, the number of captures operating in step S12 in FIG. 8 is cleared. Clear the current value acquisition count. Subsequently, in step S22, the number of zero cross processes is counted. The number of times of zero cross processing is the number of times of counting the zero cross of the AC power supply voltage detected by the zero cross detection unit 6. For example, if the number of zero cross processes is “20”, a correction value for one cycle of the AC power supply voltage is stored in the nonvolatile memory 8b.

  A correction value Id is calculated from the load current instantaneous value In (step S23). That is, the load current maximum value determination unit 52 determines the load current maximum value Iz from, for example, 50 load current instantaneous values In in a half cycle of the AC power supply. That is, with the zero cross timing as a base point, it is determined for each sampling whether or not the captured load current instantaneous value In is the maximum, and if it is the maximum, the load current maximum value Iz is held.

  Here, the load current maximum value Iz is the maximum value of the load current instantaneous value In within a predetermined number of times of sampling, but the average value of the load current instantaneous values In in a plurality of samplings before and after the load current maximum value Iz is obtained. It may be the load current maximum value Iz.

  Furthermore, after detecting a plurality of load current maximum values having different zero cross timings as the base points, they may be averaged to obtain the load current maximum value Iz.

  Subsequently, the load current maximum value Iz and the load current maximum reference value Ip on the memory 8 are compared, and a correction value Id is calculated according to the error.

  Next, it is determined whether the number of zero cross processes is a predetermined number (for example, “20”) (step S24).

  If “YES” is determined in the determination in step S24, the correction value Id is stored in the nonvolatile memory 8b (step S25). In step S <b> 26, the timing determination unit 54 stops outputting the control signal to the three-terminal thyristor 2. Finally, in step S27, the control unit 10 stores in the nonvolatile memory 8b as information that the preparation mode has been executed.

  Next, processing when the control unit 10 of the vacuum cleaner is set to the cleaning mode will be described. In a state where the main loop processing is being executed, the control unit 10 executes processing for calculating the delay time instruction value ts. After the cleaning mode is set, when it is determined that the instruction signal is taken in from the operation unit 31 by the electric vacuum cleaner user, a control signal is output at a preset initial delay time U0, and the electric blower 26 starts rotating.

Thereafter, the load current instantaneous value capturing unit 51 periodically executes a current detection routine shown in FIG. 10 by a timer (not shown) or the like.
First, in step S31, the current detection routine execution count is counted. That is, executing the current detection routine is executing current sampling, and the timer sets the current sampling period. For example, if the current sampling cycle is set to 0.2 msec under a 50 Hz AC power supply, the current is sampled 100 times during one cycle (20 msec) of the power supply voltage. Accordingly, counting the current detection routine execution count 100 times ends one cycle of the power supply voltage.

  Subsequently, in step S32, the load current instantaneous value capturing unit 51 takes in the load current instantaneous value In from the I / O port 9, and subtracts the correction value Id from the load current instantaneous value In to calculate the load current correction value Ind. (Step S33).

  In step S34, the function value output unit 52a acquires the corresponding sine function value An from the sine function value table 15 having the configuration shown in FIG.

  When the execution cycle of the current detection routine, that is, the sampling cycle is Ti, a sine value for each angular difference θ (n) −θ (n−1) is set in the sine function value table 15. θ (n) −θ (n−1) is represented by 360 ° / (Tv / Ti), and is a 50 Hz AC power source. For example, when Ti = 0.2 msec, a sin value every 3.6 °. Will be set.

  The sine function value An set in the sine function value table 15 may be set for one cycle of the power supply voltage, but the absolute value of the sine wave function is the value of the first half cycle is the value of the next half cycle. Yes. Therefore, a sine function value An corresponding to a half cycle is set in the sine function value table 15, and the sine function value An acquired from the sine function value table 15 may be repeated every half cycle.

  Therefore, when the sampling period Ti is 0.2 msec, sine function values A1 to A50 are set in the sine function value table 15, and the sine function value A1 is set when the count value of the current detection routine execution count is "1". When acquired, the sine function value A1 is also acquired when the count value is "51".

  Subsequently, in step S35, the total value calculator 53 multiplies the load current correction value Ind and the sine function value An to calculate the load current phase correction value Jn. In step S36, the load current phase correction value Jn obtained so far is added to calculate the load current correction total value Jsum. Then, the process returns to step S8 for executing the main loop. This calculation of Jsum = Σ (Jn) is repeated a predetermined number of times for each sampling period. For example, if a 50 Hz AC power supply, Ti = 0.2 msec, and the cycle of Σ calculation is a half cycle of the power supply voltage, 50 times of Jn is added from the zero cross point to the next zero cross point (20 msec / 2 ÷ 0.2 msec). = 50). Alternatively, for example, if the cycle of Σ calculation is one cycle of the power supply voltage, 100 times of Jn from the zero cross point to the second zero cross point are added.

  Further, when the control unit 10 detects the zero cross point by the zero cross detection signal from the zero cross detection unit 6 in the state where the process of the main loop (step S8) is being executed, the control unit 10 executes the zero cross routine shown in FIG. In this zero cross routine, the timing determination unit 54 determines a delay time instruction value ts that determines the output timing of the trigger signal.

  The instruction value ts for the delay time is determined by an error between the load current set value Ig and the load current correction total value Jsum. That is, the control unit 10 compares the preset load current setting value Ig with the calculated load current correction total value Jsum, changes the delay time instruction value ts based on the comparison error, and consumes the motor 5 The power is controlled to be in a preset range.

  Next, a specific example of the method for determining the delay time instruction value ts will be described. In the zero cross routine shown in FIG. 11, first, in steps S41 and S42, the timing determination unit 54 compares the load current set value Ig with the load current correction total value Jsum. When the error between the load current correction total value Jsum and the load current set value Ig is within ΔJ1, the delay time instruction value ts is left as it is. Then, in S44, the current detection execution counter value is cleared. In step S45, the load current correction total value Jsum is cleared. In step S46, the delay timer value is cleared and restarted. The process returns to step S8 for executing the main loop. In this case, the vacuum cleaner control apparatus 100 determines that the motor 5 is operating within the power consumption range set.

  Alternatively, if the value obtained by subtracting the load current correction total value Jsum from the load current set value Ig is larger than ΔJ1, the delay time instruction value ts is decreased by γ in step S47. In step S44, the current detection execution counter value is cleared. In step S45, the load current correction total value Jsum is cleared. In step S46, the delay timer value is cleared and restarted. The process returns to step S8 for executing the main loop. In this case, the vacuum cleaner control device 100 determines that the power consumption of the motor 5 is lower than the set power consumption range, increases the conduction angle of the three-terminal thyristor 2, and puts it in the motor 5. Increase power.

  On the contrary, when the value obtained by subtracting the load current set value Ig from the load current correction total value Jsum is larger than ΔJ1, the delay time instruction value ts is increased by β in step S43. In the same manner as described above, the current detection execution counter value is cleared in step S44, the load current correction total value Jsum is cleared in step S45, and the delay timer value is cleared in step S46. After restarting, the process returns to step S8. In this case, the vacuum cleaner control device 100 determines that the power consumption of the motor 5 is larger than the set power consumption range, reduces the conduction angle of the three-terminal thyristor 2, and inputs power to the motor 5. Decrease.

  Finally, the timing determination unit 54 starts measuring the delay time from the zero cross point by a cleared delay timer (not shown), and periodically executes the trigger signal output routine shown in FIG. That is, in step S51, it is checked whether the delay timer count time has reached the delay time instruction value ts. If not, the process returns to step S8. When the delay timer count time reaches the delay time instruction value ts, a trigger signal is output from the I / O port 9 to the three-terminal thyristor 2 in step S51. Then, the process returns to step S7.

  As described above, the vacuum cleaner control device 100 according to the present embodiment, in the preparation mode, the maximum value Iz of the load current instantaneous value (load current value) In and the preset load current maximum reference value Ip (reference electric motor). The correction value Id is calculated based on the difference from the value when the blower is connected. Since the load current instantaneous value In is corrected using the correction value Id in the cleaning mode, the variation of the current detection system circuit including the current detection unit 3 can be adjusted.

  Moreover, in the cleaning mode, the load current correction total value Jsum is calculated from the load current correction value Ind obtained by correcting the instantaneous load current value In using the correction value Id and the sine function value An based on the zero cross point of the power supply voltage. Calculated. The load current correction total value Jsum is load current information in which the phase difference between the power supply voltage waveform and the load current waveform is taken into account, and the load current correction total value Jsum and a preset load current set value Ig are calculated. The instruction value ts of the delay time of the trigger signal is determined by the comparison error. Therefore, when there is a variation in the phase difference between the power supply voltage waveform and the load current waveform due to variations in windings between motors and the like, and as a result, variations in power consumption between the motors, the electric cleaning of this embodiment By applying the machine control device 100, it is possible to drive while reducing variations in power consumption of each motor.

  Furthermore, although the A / D conversion process takes more time than the arithmetic processing in the microprocessor 7, the electric vacuum cleaner control device 100 of the present embodiment performs only the A / D conversion process of the current value. Therefore, the power consumption control considering the phase can be quickly performed in a short time.

  Furthermore, in the vacuum cleaner control apparatus 100 of the present embodiment, the load current correction total value Jsum is obtained by adding the load current instantaneous correction value Jn over a predetermined sampling period, for example, a half cycle of the power supply voltage. Therefore, even if the load current instantaneous value in at the time of a certain sampling is affected by noise, the influence of the noise of the load current correction total value Jsum is reduced.

  Moreover, in the vacuum cleaner control device 100 of the present embodiment, a special physical quantity detection means for the motor is not required in addition to the zero cross detection unit 6 and the current detection unit 3, and therefore the configuration of the motor control device can be simplified. .

  In the function value output unit 52a described above, the sine function value An for each sampling period is obtained from the preset sine function value table 15. However, the function value output unit 52a is not limited to this method, and the microprocessor is not limited thereto. 7 may be a method in which a dedicated sine function value calculator is provided and the sine function value is sequentially calculated for each sampling period.

  In addition, the control unit 10 described above performs a current detection routine during a period from when the zero cross cross point of the power supply voltage is detected to when the trigger signal is output to the three-terminal thyristor 2 during operation in each operation mode. The load current instantaneous value In was acquired periodically. However, the execution of the current detection routine during this period may be stopped, or the current detection routine may be executed but the instantaneous load current value detected during this period may not be used in each operation mode. Good. According to such a configuration, since no electric power is supplied to the motor 5 during this period, the load current is originally zero. However, actually, the load current instantaneous value In does not become zero due to noise or the like, and therefore the load current correction total value Jsum during this period may not become zero. Therefore, if the control unit 10 does not use the instantaneous load current value during this period for control, the load current correction total value Jsum during this period is not calculated, so that the error due to noise or the like can be reliably reduced to zero.

  In addition, the processing performed by the control unit 10 by the load current instantaneous value capturing unit 51, the function value output unit 52a, the total value calculation unit 53, and the timing determination unit 54 is executed by software installed in the memory 8. However, the present invention is not limited to this, and the functions performed by the software may be provided as hardware and executed.

  Next, another embodiment of the present invention will be described with reference to FIG. Note that the same portions as those shown in the embodiment shown in FIG. 4 are denoted by the same reference numerals, and description thereof is also omitted.

  In the preparation mode, the load current instantaneous value capturing unit 51 acquires the load current instantaneous value In detected from the current detection unit 3 at a preset sampling cycle, and the load current instantaneous value In is added to the load current instantaneous value adding unit 60. To pass. The load current instantaneous value addition unit 60 adds the load current instantaneous values (I1, I2,..., In) sampled a predetermined number of times with the zero cross timing as a base point, and obtains the load current addition value Iw from the sum.

  Then, this load current addition value Iw is passed to the load current addition value error calculation unit 61. The load current addition value error calculation unit 61 compares the load current addition value Iw with a preset load current addition reference value Iy, obtains a correction value Ix according to the error, and obtains the correction value Ix from the nonvolatile memory. 8b is stored. The correction value Ix is obtained from the error itself between the load current addition value Iw and the load current addition reference value Iy, or from a data table or a mathematical expression.

Next, in the cleaning mode, the total value calculation unit 53 corrects the load current instantaneous value In with the correction value Ix to obtain the load current correction value Ind. The subsequent flow is the same as in the above-described embodiment.
As described above, in the preparation mode, the load current instantaneous value In sampled a predetermined number of times can be added, and the correction value Id to be stored in the nonvolatile memory 8b can be calculated from the added value.

  Moreover, in the vacuum cleaner control apparatus 100, mass production is performed by preventing the operation in the normal cleaning mode unless it has been operated in the preparation mode at least once in the past as in the step shown in step S7. The mistake of forgetting the correction process in the manufacturing process can be eliminated.

  In this embodiment, the timing determination unit 54 calculates the delay time command value ts at that time from the n set values X1, X2, X3,..., Xn of the load current lower limit value Ig1 shown in the data table 16. In response to this, the load current lower limit Ig1 was obtained. In this embodiment, the present invention is not limited to this data table method, and the timing determining unit 54 assumes that the first stage setting value of the load current lower limit value Ig1 is X1, and the n stage setting value Xn is Xn. The trigger signal may be output by an arithmetic expression such as = X1 + A · (n−1) · ts.

  In the above-described embodiment, the correction value for correcting the detection current detected in the cleaning mode is stored in the preparation mode, but the correction value for correcting the threshold value to be compared with the detection current in the cleaning mode. May be stored. That is, in the above embodiment, the load current error with respect to the load current instantaneous value In is stored in the nonvolatile memory 8b as the correction value Id in the preparation mode, and the load captured by the load current instantaneous value capturing unit 51 in the cleaning mode. A load current total correction value Jsum is calculated from the instantaneous current value In based on the correction value Id stored in the nonvolatile memory 8b, and the load current total correction Jsum and the load current lower limit value Ig1 or the load current upper limit value Ig2 are calculated. Although the delay time command value ts is shortened or lengthened by one step according to the comparison result, the load current lower limit Ig1 and the load with the correction value Id for the load current instantaneous value In as a threshold value in the preparation mode are set. The correction value for the current upper limit value Ig2 is stored in the nonvolatile memory 8b, and in the cleaning mode, the load current instantaneous value capturing unit 5 is stored. The correction value Id is used as a threshold correction value without correcting the instantaneous load current value In taken in 1, and the load current total correction value Jsum and the corrected threshold value (load current lower limit Ig1 + The delay time command value ts may be shortened or lengthened by one step according to the comparison result between the correction value Id and the load current upper limit value Ig2 + correction value Id). In this case, the load current instantaneous value In and the sine function value An are directly multiplied to calculate the load current phase correction value Jn.

  In this modification, the correction value Id is calculated in the preparation mode, and this correction value Id is stored in the nonvolatile memory 8b as correction values for the load current lower limit value Ig1 and the load current upper limit value Ig2 as threshold values. However, in the preparation mode, the correction value Id is used to correct the load current lower limit value Ig1 and the load current upper limit value Ig2 as threshold values, and the corrected threshold values are stored in the nonvolatile memory 8b. You may let them. In this case, in the cleaning mode, the delay time command value ts is shortened by one step according to the load current lower limit value Ig1 corrected in the preparation mode and the comparison result between the load current upper limit value Ig2 and the load current total correction value Jsum. Or make it longer.

  Further, the delay time command value ts interval Un−Un−1 = ΔUn, the load current lower limit value Ig1 interval Xn−Xn−1 = ΔXn, and the load current upper limit value Ig2 interval Yn−Yn−1 = ΔYn. Need not be set at regular intervals, and may be set according to the use of the vacuum cleaner or the characteristics of the electric blower 26.

The perspective view which shows the structure of the vacuum cleaner which concerns on one embodiment of this invention. The figure which shows the circuit structure of the motor control apparatus which concerns on the same embodiment. The figure which shows the voltage of each part which concerns on the same embodiment, an electric current, and a signal waveform. The functional block diagram of the control part in the embodiment. The figure which shows the structure of the electric power data table used in the embodiment. The graph which showed the change of an electric power setting value and an electric power threshold value as a parameter about the relationship between the amount of intake air of an electric blower and a total electric power value when driving the vacuum cleaner of the embodiment. 7 is a flowchart showing a main routine executed by the microprocessor of the embodiment. 6 is a flowchart showing a current detection routine executed by the microprocessor of the embodiment. 7 is a flowchart showing a preparation mode process executed by the microprocessor of the embodiment. 6 is a flowchart showing a current detection routine executed by the microprocessor of the embodiment. 6 is a flowchart showing a zero cross routine executed by the microprocessor of the embodiment; 6 is a flowchart showing a control signal output routine executed by the microprocessor of the embodiment. The figure which shows the structure of the sine function value table used in the embodiment. The functional block diagram of the control part of the vacuum cleaner which concerns on other embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 3 ... Current detection part, 10 ... Control part, 6 ... Zero cross detection part, 7 ... Microprocessor, 8 ... Memory, 8b ... Nonvolatile memory area, 21 ... Vacuum cleaner main body, 100 ... Vacuum cleaner control apparatus.

Claims (5)

An electric blower comprising a motor connected to an AC power supply via a switching element driven by a control signal and a fan connected to the motor, a control unit for supplying a control signal to the switching element, and an application to the motor In a vacuum cleaner comprising a zero-cross detector for detecting zero-cross timing of an AC voltage, and a current detector for detecting a load current flowing through the motor,
The controller is
An operation mode setting means for setting the operation mode to a preparation mode for outputting the control signal at a predetermined output timing or a cleaning mode for varying the output timing of the control signal;
Storage means for storing a correction value based on the load current value detected by the current detection unit in the preparation mode;
In the cleaning mode, load current instantaneous value capturing means for sampling the load current detected by the current detection unit at a predetermined sampling period and capturing the load current instantaneous value,
Function value output means for outputting a sine function value according to the sampling period of the load current;
With reference to the load current instantaneous value captured by the load current instantaneous value capturing means, the correction value stored in the preparation mode, the sine function value output by the function value output means, and a preset threshold value, A vacuum cleaner comprising: timing determination means for determining timing of a trigger signal output to the switching element. An electric blower comprising a motor connected to an AC power supply via a switching element driven by a control signal and a fan connected to the motor, a control unit for supplying a control signal to the switching element, and an application to the motor In a vacuum cleaner comprising a zero-cross detector for detecting zero-cross timing of an AC voltage, and a current detector for detecting a load current flowing through the motor,
The controller is
An operation mode setting means for setting the operation mode to a preparation mode for outputting the control signal at a predetermined output timing or a cleaning mode for varying the output timing of the control signal;
Storage means for storing a correction threshold value obtained by correcting a preset threshold value based on a load current value detected by the current detection unit in the preparation mode;
In the cleaning mode, load current instantaneous value capturing means for sampling the load current detected by the current detection unit at a predetermined sampling period and capturing the load current instantaneous value,
Function value output means for outputting a sine function value according to the sampling period of the load current;
With reference to the instantaneous load current value captured by the instantaneous load current value capturing means, the sine function value output by the function value output means, and the correction threshold value, the timing of the trigger signal output to the switching element is determined. A vacuum cleaner comprising timing determining means for determining. 3. The electric vacuum cleaner according to claim 1, wherein the cleaning mode can be operated only after the operation in the preparation mode. The control unit controls the operation mode using the load current instantaneous value from the output timing of the control signal output to the switching element to the zero cross in the half cycle of the AC voltage applied to the motor. The vacuum cleaner according to claim 1. The vacuum cleaner according to claim 1 or 2, wherein a notification unit that notifies cleaning information in the cleaning mode also serves as a notification unit that notifies the end of the operation in the preparation mode.

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