JP4703257B2 - Electric blower drive device - Google Patents

Description

  The present invention relates to a commutator motor using an AC power source as a driving source and an electric blower driving device including a fan driven by the motor.

In an electric blower composed of a motor having an AC power source as a drive source and a commutator, a current value flowing through the motor is detected, and input power control of the electric blower is performed according to the detected current value. Such a conventional technique is disclosed in, for example, Patent Document 1.
JP-A-6-90883

  In the current when the motor is driven, external noise is generated due to the influence of circuit components and circuit patterns such as a switching power supply on the substrate on which the motor drive circuit is mounted. This external noise is conventionally removed by a noise filter or the like in order to degrade the accuracy of input power control.

  On the other hand, when an AC power source is used as a drive source and a motor including a commutator is driven, a ripple accompanying rectification occurs in the current flowing through the motor. This rectification ripple correctly reflects the rectification state of the motor rectification unit. If this ripple component is removed by a noise filter or the like, the motor input is affected.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a control device that can increase the accuracy of input power and perform appropriate control even when a ripple component or external noise generated by a motor rectifier occurs.

An electric blower comprising a motor having a commutator connected to an AC power source and a fan driven by the motor, and a current including a ripple component and an external noise component accompanying the flow rectification through the commutator to the motor. A switching element for switching; a current detection unit for detecting the current; and a current value detected from the current detection unit via a full-wave rectification unit to control timing of a control signal output to the switching element, An electric blower control device comprising a control unit that controls input power applied to the motor, wherein the control unit is configured to detect a detected value that is sampled and captured at a predetermined period by the current detection value detected by the current detection unit. And addition value calculation means for adding the current detection value acquired by the detection value acquisition means for a predetermined number of times to calculate an addition value; Has an output timing determining means for determining a control signal output to the switching element, the addition value calculating means, the ripple component input power is added in a period that is not applied to the motor is not reflected the external The added value including the noise component is set as the first added value, and the ripple component added in the full rectification wave period in which the input power is applied to the motor is reflected, and the external noise component is included. An addition value is calculated as a second addition value, and an addition correction value obtained by removing only the external noise component from the first addition value and the second addition value is calculated. An error is obtained by comparing the calculated addition correction value with a preset setting value or a preset value calculated based on a preset relational expression. To be in the range where the input power of the blower is set in advance, and to determine the timing of the control signal outputted to the switching element.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to detect the electric current of a motor and to implement the input electric power control of an electric blower with high reliability.

  Embodiments of the present invention will be described below.

  First, the case where it applies to a mobile vacuum cleaner as one embodiment of an electric fan driving device will be described. FIG. 1 shows a mobile vacuum cleaner 20.

  As shown in FIG. 1, the vacuum cleaner main body 21 has a lower case 22 whose upper surface is opened and an upper case 23 which closes the rear upper surface of the lower case 22 with a bumper 24 sandwiched around the periphery including the front surface. is doing. 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 20, for example, the amount of dust. The notification unit 40 includes a light emitting element such as an LED, a sound generation element, and the like.

  The vacuum cleaner main body 21 is provided with a dust collection bag 27 as a dust collection part at the front part of the interior, and an electric blower 26 is disposed on the back side of the dust collection bag 27 so that the intake air from the electric blower 26 is collected by dust. By passing through the bag 27, dust is separated and collected by the dust bag 27.

  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. In addition, a pair of large-diameter driven rear wheels 28 are provided on both rear side surfaces 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 operation unit 31.

  The operation unit 31 is provided with an operation button 32 for selecting the strength / weakness of the operation mode of the electric blower 26 including “OFF”, and a grip portion 33 that is gripped by an operator when cleaning. An extension tube 34 is detachably communicated with the tip of the operation unit 31, and the extension tube 34 and the hose body 30 communicate with each other via the operation unit 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. A suction port body 35 provided with a suction port for sucking dust on the surface to be cleaned is detachably attached to the tip of the extension pipe 34.

  Next, the electric blower 26 and the control part 10 which comprise the vacuum cleaner drive device 100 are demonstrated based on FIG. In the vacuum cleaner main body 21, an electric blower 26, a control circuit board 101 on which the control unit 10 and the like are mounted are incorporated.

  A motor 5 constituting an electric blower 26 and a switching element for turning on / off the input of the motor 5, for example, a bidirectional thyristor 2, are connected in series to the commercial AC power supply 1 and the current fuse 4. Yes.

The electric blower 26 mainly includes a motor 5 and a fan 13. The motor 5 is a commutator motor such as a universal motor including an armature 5a having a commutator (not shown), field windings 5b and 5c, and a carbon brush (not shown). In the motor 5, the current is rectified by a commutator and a carbon brush. As for the electric power applied to the motor 5, a current flows through the armature 5a through the commutator.
The fan 13 is a centrifugal fan connected to the rotating shaft of the motor 5.

  The current detection unit 3 is composed of, for example, a transformer. In the current detection unit 3, the current flowing through the motor 5 is converted into a voltage and becomes a current detection value. In the control unit 10, the electric power applied to the motor 5 uses this detected current value as a control signal. The zero cross point of the AC voltage applied to the motor 5 is detected by the zero cross detection unit 6.

  The control unit 10 includes a microprocessor 7, a memory 8, an I / O port 9, and the like. Among the I / O ports 9, there is a port having an A / D conversion function. The memory 8 stores in advance data such as a control program executed by the microprocessor 7 and necessary constants. The memory 8 is provided with a data storage area and a work area for temporarily storing data from the microprocessor 7.

  The current detection value detected by the current detection unit 3 is input to the I / O port 9 after full-wave or half-wave rectification by the rectification unit 11. The I / O port 9 takes in the rectified current detection value after A / D conversion. Further, the zero cross detection unit 6 inputs the detected zero cross detection signal to the I / O port 9.

  An A / D reference voltage source 12 and an operation unit 31 are provided. A reference voltage is input from the A / D reference voltage source 12 to the I / O port 9 and an instruction signal from the operation unit 31 is input to the I / O port. Input to port 9.

  Then, the control unit 10 takes in the current value of the motor 5, takes in the zero cross signal, takes in the A / D reference voltage value, takes in the instruction signal and the like, and also serves as a control terminal of the bidirectional thyristor 2. A control signal is output to the terminal. In addition, the control unit 10 outputs a notification signal to the notification unit 40 according to the operation state of the vacuum cleaner 20.

  In this electric vacuum cleaner driving apparatus 100, an AC voltage having a waveform shown in FIG. 3A is applied from the commercial AC power source 1, and the control unit 10 applies the gate voltage of the bidirectional thyristor 2 to the gate terminal of FIG. 3), the bidirectional thyristor 2 is turned on 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 motor 5. To do.

  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, and the control unit 10 detects the zero cross point. Moreover, when the rectifier 11 performs full-wave rectification, the detected waveform detected by the current detector 3 is as shown in (e) of FIG. 3, for example. In addition, when the rectifying unit 11 performs half-wave rectification, the detected waveform of the current detection value is, for example, as illustrated in FIG. This detected waveform is input to the control unit 10 as it is.

  When the cycle of the AC power supply voltage is Tv (sec) and the time from the zero cross point of the power supply voltage to the output of the control signal of the motor 5 is ta (sec), the conduction angle φa (%) of the bidirectional thyristor 2 is , Φa = {(Tv / 2) −ta} / (Tv / 2) × 100. Hereinafter, the time ta (sec) from the zero cross point of the power supply voltage until the control signal of the bidirectional thyristor 2 is output is referred to as output timing.

  Next, each function of the control unit 10 will be described with reference to FIG. The control unit 10 includes a detection value capturing unit 71, an addition value calculation unit 72, an addition value correction unit 73, an output timing determination unit 74, and the like.

The detection value fetching unit 71 acquires a current detection value In as an instantaneous value of the motor 5 detected from the current detection unit 3 at a predetermined period set by the timer 45 or the like, and calculates this current detection value In as an addition value. Pass to part 72. In the present invention, since the power supply voltage is constant, the input power is uniquely determined by the input current In, and this current detection value In changes according to the increase or decrease of the input power of the electric blower 26. Furthermore, since the relationship between the current detection value In and the input power varies depending on the characteristics of the electric blower 26 and the conduction angle φa, it is experimentally grasped in advance.

The addition value calculation unit 72 calculates the addition value by adding the current detection value In passed from the detection value fetching unit 71 for a preset number of times of sampling. Furthermore, the addition value calculation unit 72 calculates a plurality of current addition values when input power is applied at different timings. Specifically, for example, the added value calculation unit 72 includes the added value A of the current detection value In detected in the A section shown in FIG. 3E, that is, the section where the input power is not applied, and the B section, that is, the rectified full wave section. And the addition value B of the current detection value In detected in step (b) is calculated and the addition value A and the addition value B are passed to the addition correction unit 73. Since the addition value B is calculated based on the current detection value In as an instantaneous value, it is a value obtained by superimposing a rectification ripple generated when a current flows through the commutator and external noise. The added value A is a value in which a current value due to external noise or the like is taken into account that no input power is applied.

  The addition correction unit 73 calculates an addition correction value P from the addition value A and the addition value B. The calculation method is set as addition correction value P = addition value B−addition value A. A section A in FIG. 3 is a part of a non-driving section in which the power supply voltage is supplied to the vacuum cleaner 20 but the motor 5 is not rotating. The B section is a part of the driving section where the input power is applied and the motor 5 is rotating. By such processing, the addition correction value P is calculated as a value including the rectification ripple accompanying the driving of the motor 5 and excluding the external noise component. Then, the addition correction unit 73 passes the addition correction value P to the output timing determination unit 74. Thus, the addition correction value is

  The output timing determination unit 74 compares the addition correction value P with a preset value set in the memory 8 to obtain an error, and according to the error, the output timing ta of the control signal of the bidirectional thyristor 2 is obtained. To decide. This output timing ta becomes a control command value for controlling on / off of the bidirectional thyristor 2.

  Next, a specific example is illustrated, and the control unit 10 described above compares the addition correction value P with a preset value set in the memory 8 to obtain an error, and according to this error A method of determining the output timing ta of the control signal of the bidirectional thyristor 2 so that the input power of the electric blower 26 is in a preset range will be described.

  First, the control unit 10 provides the data table 16 for controlling the input power of the electric blower 26 in the memory 8. The structure of this data table 16 is shown in FIG.

  First, the data table 16 includes n + 1 values U0, U1, U2,..., Un (where Un <... <U2 <U1 <) as output timing values that are the output timing ta of the control signal of the bidirectional thyristor 2. U0.) Is set. And, as the lower limit current threshold Ig1 corresponding to these output timing values, n thresholds X1, X2, X3,..., Xn (where Xn>...> X3> X2> X1) are similarly set to the upper limit. As the current threshold value Ig2, n threshold values Y1, Y2, Y3,..., Yn (where Yn>...> Y3> Y2> Y1) are set. As shown in FIG. 6, the magnitude relation between these current thresholds Ig1 and Ig2 is X1 <X2 <Y1 <X3 <Y2 <X4 <Y3 <X5 <Y4 <..., Xn <Yn.

  When the motor 5 is started, the control unit 10 sets the output timing value U0 so that the amount of intake air corresponding to the input power of the electric blower 26 is equal to or greater than Q0 in a state where no dust is trapped in the dust bag 27. Set to. At this time, for example, the operating point of the electric blower 26 is point A in FIG.

  In this state, when the motor 5 is driven to start collecting dust, the dust is captured in the dust collection bag 27. As dust capture proceeds, 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 input power of the electric blower 26 gradually decreases from the point A.

  When the addition correction value P becomes equal to or lower than the lower limit current threshold value X1, the control unit 10 changes the output timing value from U0 to U1 so as to shorten the output timing ta of the control signal to the bidirectional thyristor 2. The conduction angle of the bidirectional thyristor 2 is increased, and the intake air volume of the electric blower 26 is increased. At this time, the input power of the electric blower 26 increases.

  Thereafter, as dust capture proceeds, the air path resistance of the dust bag 27 further increases, and the intake air volume of the electric blower 26 decreases. Thereby, the input power of the electric blower 26 also gradually decreases. Therefore, the current detection value In becomes small according to the input power, and the addition correction value P becomes small at the same time.

  After that, when the addition correction value P becomes lower than the lower limit current threshold value X2, the control unit 10 changes the output timing value from U1 to U2 so that the output timing ta of the control signal to the bidirectional thyristor 2 is further shortened. Then, the conduction angle of the bidirectional thyristor 2 is further increased, and the intake air volume of the electric blower 26 is increased. At this time, the input power of the electric blower 26 increases.

  As described above, as the trapping of dust into the dust bag 27 proceeds, the addition correction value P becomes lower than the lower limit current threshold values X1, X2, X3, X4,. Is changed from U0 to U1, U2, U3,. That is, the control unit 10 compares the addition correction value P with the lower limit current threshold value that is a preset value set in the memory 8 to obtain an error, and the input power of the electric blower 26 is determined in advance according to the error. The output timing ta of the control signal of the bidirectional thyristor 2 is determined so as to be within the set range.

  The control method described above is a control that assumes a case where the amount of dust in the dust bag 27 increases, the resistance of the air passage increases, and the input power of the electric blower 26 decreases. On the other hand, when the user is using the vacuum cleaner 20, the positional relationship between the suction port 35 and the cleaning surface is changed, the bend angle of the hose body 30 is changed, or the dust bias in the dust bag 27 is changed. As a result, the air path resistance may decrease, and the suction air volume may increase rapidly.

  In this case, for example, when the operation point of the electric blower 26 is at B and the addition correction value P is equal to or higher than the upper limit current threshold Y3, the control unit 10 determines that the output timing ta of the control signal to the bidirectional thyristor 2 is The output timing value is changed from U4 to U3 so as to be longer, the conduction angle of the bidirectional thyristor 2 is reduced, and the intake air volume of the electric blower 26 is reduced. At this time, the input power of the electric blower 26 decreases. In this way, the control unit 10 determines the output timing ta of the control signal of the bidirectional thyristor 2 so that the input power of the electric blower 26 falls within a preset range.

  Next, a control flow of the electric vacuum cleaner 20 as an embodiment of the electric blower driving device will be described with reference to FIGS. The control flows shown in FIGS. 7 to 9 are obtained by extracting only the control flows related to the present invention. The control unit 10 performs the processes shown in FIGS. 7 to 9 according to a control program stored in advance in the memory 8.

  The control unit 10 performs the processing of the main routine shown in FIG. 7 according to a control program stored in advance in the memory 8. In this main routine, first, in step S1, the control unit 10 performs various initial settings. In step S <b> 2, when the control unit 10 determines a start instruction from the operation unit 31, the control unit 10 proceeds to step S <b> 3 and permits a periodic current detection process of the motor 5. In step S4, the control unit 10 determines whether or not the addition value A of the A section shown in FIG. Next, when determining that the addition value A has been calculated, the control unit 10 proceeds to step S5, outputs a control signal to the bidirectional thyristor 2 at an initial output timing, and the motor 5 starts to rotate. And a process progresses to step S6 and becomes a main loop.

  Next, a current detection routine for performing the current detection process permitted in step S3 in FIG. 7 will be described with reference to FIG. The execution period of this current detection routine is set to 0.2 msec by the timer 45, for example. First, in step S11, the number of execution times of the current detection routine is counted. Here, the fact that the control unit 10 counts the number of executions of the current detection routine counts the number of times the control unit 10 takes in the current detection value of the motor 5.

  Subsequently, in step S <b> 12, the detection value capturing unit 71 captures the current detection value In of the motor 5 from the I / O port 9. In step S13, the addition value calculation unit 72 adds the current detection value In obtained so far. Next, in step S14, when the number of executions of the current detection routine has not reached the preset value, the current detection routine is temporarily terminated.

  Alternatively, in step S14, when the number of executions of the current detection routine reaches a preset value, for example, 20 times, the process proceeds to step S15, and the addition value calculation unit 72 executes this current detection process. To determine which section. The discrimination between the A section and the B section is made based on, for example, whether or not the control signal of the bidirectional thyristor 2 is output. When determining that this section is the A section, the adding section calculating section 72 recognizes the value added so far as the added value A and passes the added value A to the added value correcting section 73 in step S16. In step S17, the current detection routine execution counter is reset.

  Alternatively, in step S15, when the addition unit calculation unit 72 determines that this section is the B section, in step S16, the value added so far is recognized as the addition value B, and the addition value B is added. The value is transferred to the value correction unit 73.

  Next, a specific example in which the output timing of the control signal of the bidirectional thyristor 2 is determined using the addition value A and the addition value B calculated in the current detection routine of FIG.

  In the output timing determination routine shown in FIG. 9, first, in step S21, the addition value correction unit 73 calculates the addition correction value P by subtracting the addition value A from the addition value B, and outputs this addition correction value P. It is passed to the timing determination unit 74. Next, in step S22, the output timing determination unit 74 compares the addition correction value P with the lower limit current threshold corresponding to the output timing at that time shown in FIG. 5, and if the addition correction value P is greater than or equal to the lower limit current threshold. If so, the process proceeds to step S23. Subsequently, in step S23, the output timing determination unit 74 compares the addition correction value P with the upper limit current threshold corresponding to the output timing at that time shown in FIG. If the addition correction value P is equal to or less than the upper limit current threshold value, the output timing determination unit 74 determines that the electric blower 26 is operating within the preset input power range, and does not change the output timing.

  Alternatively, in step S22, the output timing determination unit 74 compares the addition correction value P with the lower limit current threshold value. If the addition correction value P is smaller than the lower limit current threshold value, the process proceeds to step S24 and increases the output timing by one step. . In this case, the output timing determination unit 74 determines that the input power of the electric blower 26 is lower than the preset input power range, shortens the output timing ta, and sets the conduction angle of the bidirectional thyristor 2. Increase the input power to the electric blower 26.

  Conversely, in step S23, the output timing determination unit 74 compares the addition correction value P with the upper limit current threshold value. If the addition correction value P is larger than the upper limit current threshold value, the process proceeds to step S25, and the output timing is increased by one step. Lower. In this case, the output timing determination unit 74 determines that the input power of the electric blower 26 is larger than the preset input power range, lengthens the output timing ta, and sets the conduction angle of the bidirectional thyristor 2. The power input to the electric blower 26 is reduced by reducing the power.

As described above, the vacuum cleaner driving apparatus 100 according to the embodiment of the present invention adds the current detection value In as an instantaneous value for a predetermined number of sampling times in the B section to which the input power is applied, and the added value. Find B. Further, the electric vacuum cleaner driving apparatus 100 obtains an added value A by adding the current detection value In as an instantaneous value by a predetermined number of times in the A section where the input power is not applied at a timing different from the B section. Then, the electric vacuum cleaner driving apparatus 100 calculates the addition correction value P by subtracting the addition value A from the addition value B. That is, the effective current addition value applied to the motor 5 is subtracted from the current addition value B in the interval in which no input power is applied from the current addition value B in the interval in which the input voltage is applied to the motor 5. Can be calculated.
Further, the vacuum cleaner driving device 100 obtains an error by comparing the addition correction value P with a threshold value as a preset setting value, and the input power of the electric blower 26 is preset according to the error. The timing of the control signal output to the switching element 2 is determined so as to be in the range. Since the addition value B is calculated based on the current detection value In as an instantaneous value, the rectification ripple and the external noise are added, and the addition value A is a value that takes the external noise into consideration. Therefore, since this embodiment can reduce the influence of only the external noise component and can calculate the addition correction value P as a current detection value in consideration of the rectification ripple, the effective input power control is performed. Therefore, the accuracy can be improved. Further, since the addition value A and the addition value B can be calculated by basically the same method, the configuration of the control unit 10 is not complicated.

  Next, another embodiment of the present invention will be described with reference to FIG. In this embodiment, the rectification unit 11 shown in FIG. 4 is configured by a half-wave rectification circuit, and the current detected from the current detection unit 11 is half-end rectified and input to the control unit 10.

  The control flow shown in FIG. 10 is the same flow as the current detection routine shown in FIG. The different steps are steps S35, S36 and S37. In step S <b> 35, the added value calculation unit 72 determines a section in which the current detection process is being performed. The section to be determined is the C section or the D section shown in FIG. The determination of the C section or the D section uses, for example, the zero cross detection signal shown in FIG. 3B, and the section after the rising edge of this zero cross detection signal is the C section, that is, the rectified half-wave section, and the section after the falling is the D section. That is, the non-rectifying half-wave section is used. When the addition unit calculation unit 72 determines that this section is the C section, that is, when it is determined as the section to which the input power is applied, the value added so far is recognized as the addition value C in step S36. Then, the addition value C is passed to the addition value correction unit 73. Since the addition value C is calculated based on the current detection value In as an instantaneous value, it is a value in which the rectification ripple and external noise are superimposed. The added value D is a value to which external noise is added.

  Alternatively, in step S35, when the adding unit calculating unit 72 determines that this section is the D section, in step S36, the value added so far is recognized as the added value D, and the added value D is added. The value is transferred to the value correction unit 73.

  Here, both the C section and the D section in FIG. 3 are part of the driving section in which the motor 5 is rotating. However, due to the half-wave rectification of the rectifying unit 11, the D section is a section in which the current detection value of the motor 5 is not detected. Therefore, the addition correction unit 73 sets the addition correction value P = the addition value C−the addition value D, so that the addition correction value P includes the rectification ripple accompanying the driving of the motor 5 and reduces only the external noise component. Value. Then, the addition correction unit 73 passes this addition correction value P to the output timing determination unit 74.

  In such an embodiment, the control unit 10 can easily calculate the addition correction value P only from the addition values of the C section and the D section during driving of the motor 5.

  Furthermore, since the control unit 10 can calculate the addition value for calculating the addition correction value P while the motor 5 is being driven, the motor 5 is being driven by periodically executing the current detection routine shown in FIG. In addition, near real-time noise components can be detected in response to temporal changes in external noise components that change every moment. As a result, the detection accuracy of the addition correction value P can be increased.

  That is, the control unit 10 calculates the addition correction value P using the addition value C and the addition value D calculated from the adjacent C section and D section, so that the addition correction value P is at a certain timing of the motor 5. The current value of is more accurately reflected.

  In addition, the control unit 10 calculates the added value in units of at least a half cycle of the AC power supply voltage applied to the motor 5. Specifically, the current capturing unit 71 captures the current detection value In at a cycle of 0.2 msec, for example, under a 50 Hz AC power supply. That is, the control unit 10 synchronizes the addition value A, the addition value B, the addition value C, or the addition value D calculated by the current detection flow shown in FIG. 8 or FIG. 10 with the falling or falling of the zero-cross detection signal. And clear it. Then, the number of determinations in step S14 or S34 is set to 50, and the current detection value In is captured 50 times during a half cycle (10 msec) of the power supply voltage. Then, the current detection value In is sequentially added, and the addition value A, the addition value B, the addition value C, or the addition value D is calculated.

  By such control, it is possible to easily set the number of current detection values In for calculating the addition value A, the addition value B, the addition value C, or the addition value D using the zero cross detection signal of the AC power supply voltage. Furthermore, since the zero cross detection signal is a periodic signal, it is useful for periodically updating the addition value A, the addition value B, the addition value C, or the addition value D.

  In the above-described embodiment, the control unit 10 calculates the added value A, the added value B, the added value C, or the added value D from each of the A section, the B section, the C section, or the D section. However, as shown in FIG. 3 (e), a plurality of added values are calculated from each of the plurality of sections, and the calculated plurality of added values are averaged to obtain an added value A, an added value B, and an added value. C or a final value of the added value D may be used.

  Further, the processing performed by the control value acquisition unit 71, the addition value calculation unit 72, the addition value correction unit 73, and the output timing determination unit 74 of the control unit 10 described so far is implemented in the memory 8. It is not limited to the case where it is executed by software, and the function formed by the software may be provided as hardware and executed.

  Further, as another embodiment, the electric blower driving device of the present invention includes a fixed dust collector installed between a wall, a ceiling, a roof, or a floor, or a plurality of dust collectors. The present invention can be similarly applied to a central dust collector or the like having an intake port.

The perspective view which shows the structure of the vacuum cleaner which concerns on embodiment of this invention. The figure which shows the structure of the vacuum cleaner control apparatus which concerns on embodiment of this invention. The figure which shows the voltage and signal waveform of each part in the embodiment. The figure explaining the functional block of the control part of the embodiment. The figure which shows the structure of the data table used in the embodiment. The graph which showed the relationship between the intake air volume of an electric blower, and input electric power when driving the vacuum cleaner of the embodiment. The figure which shows the control flow of the embodiment. The figure which shows the control flow of the embodiment. The figure which shows the control flow of the embodiment. The figure which shows the control flow of other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Switching element 3 Current detection part 4 Current fuse 5 Motor 6 Zero cross detection part 7 Microprocessor 8 Memory 9 I / O port 10 Control part 11 Rectification part 12 A / D reference voltage source 13 Fan 20 Vacuum cleaner 21 Vacuum cleaner main body 22 Lower Case 23 Upper Case 24 Bumper 25 Lid 26 Electric Blower 27 Dust Collection Bag 28 Driven Rear Wheel 29 Main Body Suction Part 30 Hose Body 31 Operation Part 32 Operation Button 33 Gripping Part 34 Extension Pipe 35 Suction Port Body 40 Notification Part 61 DC Power source 62 Switching element 63 Current detection unit 64 Output timing determination unit 65 PWM signal generation unit 71 Detection value fetching unit 72 Addition value calculation unit 73 Addition value correction unit 74 Output timing determination unit 100 Vacuum cleaner control device 101 Control circuit board

Claims (5)

An electric blower comprising a motor having a commutator connected to an AC power source and a fan driven by the motor, and a current including a ripple component and an external noise component accompanying the flow rectification through the commutator to the motor. A switching element for switching; a current detection unit for detecting the current; and a current value detected from the current detection unit via a full-wave rectification unit to control timing of a control signal output to the switching element, In the electric blower control device comprising a control unit that controls the input power applied to the motor,
The controller is
Detection value capturing means for sampling and capturing the current detection value detected by the current detection unit at a predetermined period;
An addition value calculation means for calculating an addition value by adding the current detection value acquired by the detection value acquisition means for a predetermined number of sampling times; an output timing determination means for determining a control signal to be output to the switching element;
Have
The addition value calculation means sets an addition value including the external noise component that does not reflect the ripple component added during a period in which input power is not applied to the motor as a first addition value, and inputs power to the motor. An added value that reflects the ripple component added in the rectified full wave period to which is applied and includes the external noise component is calculated as a second added value, and the first added value and the first added value are calculated. An addition correction value obtained by removing only the external noise component from the addition value of 2,
The output timing determining means compares the calculated addition correction value with a preset setting value or a preset value calculated based on a preset relational expression to obtain an error, and according to the error The timing of the control signal output to the switching element is determined so that the input power of the electric blower falls within a preset range. An electric blower comprising a motor connected to an AC power source and having a commutator and a fan driven by the motor, and a current including a ripple component and an external noise component flowing through the commutator through the commutator. Controlling the timing of a control signal output to the switching element by a switching element, a current detection part for detecting the current, and a current value detected from the current detection part via a half-wave rectification part, In the electric blower control device comprising a control unit that controls the input power applied to the motor,
The controller is
Detection value capturing means for sampling and capturing the current detection value detected by the current detection unit at a predetermined period;
An addition value calculation means for calculating an addition value by adding the current detection value acquired by the detection value acquisition means for a predetermined number of sampling times; an output timing determination means for determining a control signal to be output to the switching element;
Have
The addition value calculating means includes an addition value including the external noise component that does not reflect the ripple component added during a period in which input power is not applied to the motor, or a motor in which input power is applied to the motor. A rectified half-wave period in which a half-wave appears in which a first added value is an added value including the external noise component that does not reflect the ripple component added in a non-rectified half-wave period in which a driving half-wave does not appear in calculating the added value the ripple component which is added is in the external noise component is reflected as a second addition value, the first adding value and the external from the second addition value Calculate the addition correction value that removes only the noise component ,
The output timing determination means compares the calculated addition correction value, the addition correction value, a preset setting value, or a preset value calculated based on a preset relational expression, and calculates an error. The electric blower drive device characterized in that the timing of the control signal output to the switching element is determined so that the input power of the electric blower falls within a preset range according to the error.   The detection value fetching means makes the sampling number of the current detection value for calculating the first current addition value the same as the sampling number of the current detection value for calculating the second current addition value. The electric blower drive device according to claim 1 or 2, characterized in that   The electric blower drive device according to claim 2, wherein the control unit periodically updates the first addition value added in a non-rectifying half-wave period during driving of the motor. The control unit includes a zero cross detection unit that detects a zero cross point of an AC voltage applied to the motor,
The control unit calculates the first addition value and the second addition value in units of at least a half cycle of the AC voltage applied to the motor with reference to a zero cross point of the AC voltage detected by the zero cross detection unit. The electric blower drive device according to claim 1 or 2, wherein

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