JPH1056772A - Power-supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power-supply apparatus in which the generation of higher harmonics is suppressed and in which electric power to be supplied to a load can be adjusted. SOLUTION: A power-supply apparatus is provided with a triac 34 by which the current of an AC power supply is made to flow to a motor-driven blower 11 and with operating switches 21 to 27 which set the magnitude of electric power to be supplied to the triac 34. In the power-supply apparatus, when the phase of an AC voltage is controlled by turning on and off the triac 34 according to the magnitude of the electric power to be set by the operating switches 21 to 27, both a large phase angle and a small phase angle are used in order to reduce the generation of higher harmonics in a setting range in which the higher harmonics are generated much, and a control part 35 which controls the phase of the triac 34 is installed so as to correspond to electric power to be set by the large phase angle and the small phase angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device having setting means for setting the amount of power supplied to a load.

[0002]

2. Description of the Related Art A power supply for supplying electric power to an electric motor of a vacuum cleaner, for example, has been known. Such a power supply device has a triac or the like, and the phase of the triac is controlled to adjust the amount of electric power supplied to the electric motor. By adjusting the magnitude of the supplied power, dust is efficiently sucked in accordance with the state of the object to be cleaned.

[0003]

However, in such a power supply device, since the phase control is performed, a high voltage is suddenly applied to the electric motor. For this reason, there is a problem that the waveform of the current flowing through the electric motor is distorted to generate harmonics, which adversely affects other devices.

[0004] The present invention has been made in view of the above problems, and an object of the present invention is to provide a power supply device capable of suppressing generation of harmonics and adjusting electric power supplied to a load.

[0005]

In order to achieve the above object, according to the present invention, there is provided a switching device for flowing a current of an AC power supply to a load, and an amount of power supplied to the load. And a setting unit for setting the magnitude of the harmonics when the switching unit is turned on and off to control the phase of the AC voltage in accordance with the magnitude of the power set by the setting unit. In the setting range where the generation is large, both the large and small phase angles are used to reduce the generation of harmonics, and the phase of the switch means is controlled so that the power according to the large and small phase angles corresponds to the set power. A control means is provided.

According to a second aspect of the present invention, when the control means controls the phase of the switch means using both large and small phase angles, the control means controls the switch means in accordance with the magnitude of the power set by the setting means. It is characterized in that phase control with a longer on-time and phase control with a shorter on-time are alternately performed as compared with the on-time.

According to the third aspect of the present invention, when the control means alternately performs the phase control of the long on-time and the phase control of the short on-time, the AC voltage on the positive polarity side and the AC voltage on the negative polarity side become different. It is characterized by being equalized.

According to a fourth aspect of the present invention, when the control means controls the phase of the switch means using both large and small phase angles, the AC voltage on the positive polarity side and the AC voltage on the negative polarity side change during a plurality of cycles. It is characterized by making it equal.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of a vacuum cleaner to which a power supply device according to the present invention is applied will be described with reference to the drawings.

In FIG. 1, reference numeral 10 denotes a vacuum cleaner main body,
In the main body 10, an electric blower (load) 11, a dust filter 12, a power supply device 30 (see FIG. 2) for supplying electric power to the electric blower 11, and the like are provided. Reference numeral 13 denotes a hose connected to the cleaner body 10, and reference numeral 14 denotes a suction port connected to the hose 13 via an extension pipe 15.
4, a rotary brush (not shown) and a brush motor 16 for rotating the rotary brush are provided.

Reference numerals 21 to 27 denote operating units 20 of the hose 13.
, An operation switch (setting means) provided at 21; an off switch 21; a high power switch 22; a strong switch 23; a medium switch 24; a weak switch 25; a silent switch 26; Brush operation switch. 28 is a handle. The operation switches 22 to 26 are for setting the amount of electric power supplied to the electric blower 11.

FIG. 2 is a block diagram showing the configuration of the power supply device 30. In FIG. 2, reference numeral 31 denotes an AC power supply, 32 denotes a full-wave rectifier circuit for rectifying an AC voltage of the AC power supply 31, and 33 denotes a rectified rectifier. A zero-crossing detection circuit for detecting a zero-crossing point from the voltage and outputting a zero-crossing pulse at the zero-crossing point; and a triac (switch means) for flowing an AC current from an AC power supply 31 to the electric blower 11;
Reference numeral 6 denotes a triac for passing an AC current from an AC power supply 31 to the brush motor 16.

Reference numeral 35 denotes a control unit (control means) including a CPU and the like. The control unit 35 includes operation switches 21 to 26.
The electric power supplied to the electric blower 11 is controlled based on the operation of. The control unit 35 controls on / off of electric power supplied to the brush motor 16 based on the operation of the brush operation switch 27.

Next, the operation of the first embodiment will be described with reference to the flowcharts of FIGS. In the drawings, steps are denoted by S.

When any one of the operation switches 22 to 26 is pressed, an input setting routine starts. Then, in step 1, a to e = 0 are set. In step 2, it is determined whether or not the high power switch 22 has been pressed. If the answer is yes, a = 1 and be to e = 0 are set in step 7, and the process proceeds to the input processing routine. If no, go to step 3.

In step 3, it is determined whether or not the strong switch 23 has been pressed.
1, a, c to e are set to 0, and the process proceeds to the input processing routine. If no, go to step 4.

In step 4, it is determined whether or not the middle switch 24 has been pressed.
1, a, b, d, e are set to 0, and the process proceeds to the input processing routine. If no, go to step 5.

At step 5, it is determined whether or not the weak switch 25 has been pressed.
= 1, a to c, e = 0, and the process proceeds to the input processing routine. If no, go to step 6.

In step 6, it is determined whether or not the silent switch 26 has been pressed. If yes, e = 1 and a to d = 0 are set in step 11, and the process proceeds to the input processing routine. If no, the process proceeds directly to the input processing routine.

When the process proceeds to the input processing routine, it is determined in step 20 whether or not a = 1. That is,
It is determined whether or not the high power switch 22 has been pressed. If the answer is yes, a zero-cross is detected in step 25, and then the triac 34 is turned on and the routine returns.
Here, as shown in FIG. 6, the triac 34 is kept on, the AC current of the AC power supply 31 is passed to the electric blower 11 as it is, and the output of the electric blower 11 is maximized.

If the determination in step 20 is NO, the process proceeds to step 21. In step 21, it is determined whether or not b = 1. That is, it is determined whether or not the strong switch 23 has been pressed.
= 0, x = 0, y = 0, and T1 = B, and the process proceeds to the phase control routine.

If the determination in step 21 is NO, the process proceeds to step 22, where it is determined whether c = 1. That is, it is determined whether or not the middle switch 23 is pressed.
= 0, x = 1, y = 0, T1 = C1, T2 = C2, and the routine proceeds to the phase control routine.

If a negative determination is made in step 22, the process proceeds to step 23, in which it is determined whether or not the weak switch 25 is pressed.
At 8, d = 0, x = 0, y = 0, T1 = D are set, and the routine proceeds to the phase control routine.

If a negative determination is made in step 23, the process proceeds to step 24, in which it is determined whether or not the silent switch 26 has been pressed. If yes, e = 0, x = 0, y in step 29. = 0 and T1 = E, and the process proceeds to the phase control routine.

When the process proceeds to the phase control routine, when the process proceeds to the phase control routine after the setting of step 26 in the previous input processing routine, the zero cross detection circuit 33 detects the zero cross point in step 30 and the zero cross point is detected at this zero cross point. Output pulse. At the same time, an internal timer (not shown) is started from t = 0. When the internal timer starts, the process proceeds to step 31.

In step 31, it is determined whether or not x = 1. In step 26, b = 0, x = 0, y =
0, T1 = B, so that the answer is no, and the process proceeds to step 32.

In step 32, the count of the internal timer is checked, and the routine proceeds to step 33. In step 33, the count t checked in step 32 is equal to the time T1 (=
B) It is determined whether or not the above is true, that is, whether or not the time B has elapsed since the start of the internal timer. If no, step 33 is repeated. If yes, step 3
Then, in step 34, the triac 34 is turned on, and the process returns after step 34. Then, these operations are repeatedly performed, and the phase control is performed. Time B
Is set such that 75% phase control is performed.
The phase control based on this phase angle is performed at time B from each zero cross point.
Is performed on the positive polarity side and the negative polarity side of the power supply after the time elapses, and is a single phase control in which the phase is controlled at a single timing.

When the process proceeds to the phase control routine, the process proceeds to the phase control routine after the setting of step 27 in the previous input processing routine. At step 30, the zero cross detection circuit 33 detects the zero cross point, and at this zero cross point, the zero cross point is detected. Output pulse. At the same time, an internal timer (not shown) is started from t = 0. When the internal timer starts, the process proceeds to step 31.

In step 31, it is determined whether or not x = 1. In step 27, c = 0, x = 1, y =
Since 0, T1 = C1, and T2 = C2 have been set, the determination is yes, and the process proceeds to step 35.

In step 35, it is determined whether or not y = 1. In step 27, c = 0, x = 1, y =
0, T1 = C1, and T2 = C2, so the determination is NO, and the process proceeds to step S36. In step 36, y =
Change 0 to y = 1 and proceed to step 32.

At step 32, the count of the internal timer is checked, and the routine proceeds to step 33. In step 33, the count t checked in step 32 is the time T1 (= C
1) It is determined whether or not the above is true, that is, whether or not the time C1 has elapsed since the start of the internal timer. If no, step 33 is repeated. If yes, the process proceeds to step 34, where the triac 34 is turned on and returns after step 34. The setting contents at this time are: c = 0, x = 1, y = 1, T1 = C1, T2
= C2.

When returning, the zero-crossing detection circuit 33 detects the zero-crossing point again at step 30 and outputs a zero-crossing pulse at this zero-crossing point. At the same time, an internal timer (not shown) is started from t = 0. When the internal timer starts, the process proceeds to step 31.

At step 31, it is determined whether or not x = 1. In step 27, c = 0, x = 1, y =
1, since it is set that T1 = C1 and T2 = C2, the determination is yes, and the process proceeds to step 35.

At step 35, it is determined whether or not y = 1. In step 27, c = 0, x = 1, y =
Since 1, T1 = C1 and T2 = C2 are set, the determination is yes, and the process proceeds to step 37. In step 37, y
= 1 is changed to y = 0, and the routine proceeds to step 38.

At step 38, the count of the internal timer is checked, and the routine proceeds to step 39. In step 39, the count t checked in step 38 is equal to the time T2 (= C
2) It is determined whether or not the above is true, that is, whether or not the time C2 has elapsed since the internal timer was started. If no, step 39 is repeated. If yes, the process proceeds to step 40, in which the triac 34 is turned on, and the process returns after step 40. The setting contents at this time are: c = 0, x = 1, y = 0, T1 = C1, T2
= C2.

Thereafter, these operations are repeatedly performed to perform phase control. The times C1 and C2 are set so that 60% phase control is performed. This phase control is always performed on the positive polarity side and the negative polarity side of the power supply after the lapse of time C1 and C2 from each zero cross point, and is a multiple phase control in which the phase is controlled at two timings.

In this multiple phase control, x is used to determine whether to perform multiple control, and y is used to determine which of route a and route b in the flowchart of FIG. 5 is to be processed.
Then, in route a, C1 is generated from the generation of the zero-cross pulse.
After a lapse of time, the triac 34 is turned on. In the route b, the triac 34 is turned on after a lapse of C2 time from the generation of the zero cross pulse. That is, 2
Multiple timing control is performed by one timing.

When the process proceeds to the phase control routine, the process proceeds to the phase control routine after the setting in step 28 in the previous input processing routine. In step 30, the zero-crossing detection circuit 33 detects a zero-crossing point. Output pulse. At the same time, an internal timer (not shown) is started from t = 0. When the internal timer starts, the process proceeds to step 31.

In step 31, it is determined whether or not x = 1. In step 28, b = 0, x = 0, y =
0, since T1 = D is set, it is no, and it progresses to step 32.

At step 32, the count of the internal timer is checked, and the routine proceeds to step 33. In step 33, the count t checked in step 32 is equal to the time T1 (=
D) It is determined whether or not the time is equal to or longer, that is, whether or not the time D has elapsed since the start of the internal timer. If no, step 33 is repeated. If yes, step 3
Then, in step 34, the triac 34 is turned on, and the process returns after step 34. Then, these operations are repeatedly performed to perform phase control. Time D is set so that 40% of phase control is performed. This phase control is a single-phase control that is always performed on the positive polarity side and the negative polarity side of the power supply after a lapse of time D from each zero-cross point, and performs phase control at a single timing.

When the process proceeds to the phase control routine, when the process proceeds to the phase control routine after the setting of step 29 in the previous input processing routine, the zero cross detection circuit 33 detects the zero cross point in step 30 and the zero cross point is detected at this zero cross point. Output pulse. At the same time, an internal timer (not shown) is started from t = 0. When the internal timer starts, the process proceeds to step 31.

In step 31, it is determined whether or not x = 1. In step 29, b = 0, x = 0, y =
0, so that T1 = E, the result is no, and the process proceeds to step 32.

In step 32, the count of the internal timer is checked, and the flow advances to step 33. In step 33, the count t checked in step 32 is equal to the time T1 (=
E) It is determined whether or not the above is true, that is, whether or not the time E has elapsed since the start of the internal timer. If no, step 33 is repeated. If yes, step 3
Then, in step 34, the triac 34 is turned on, and the process returns after step 34. Then, these operations are repeatedly performed to perform phase control. Time E is set so that 25% phase control is performed. This phase control is always performed on the positive polarity side and the negative polarity side of the power supply after a lapse of time E from each zero cross point, and is a single phase control in which the phase is controlled at a single timing.

As described above, in the first embodiment, the single phase control is performed when "strong", "weak", or "quiet" with less occurrence of harmonics, and the multi-phase control is performed when "middle" with more occurrences of harmonics. do. This makes it possible to reduce the generation of harmonics at the time of “medium”, and at the same time, to perform phase control on the positive polarity side and the negative polarity side of the AC voltage. Sound can be reduced.

The operation of the second embodiment will be briefly described based on the flow of FIG.

For example, when the middle switch 24 is depressed, after steps 50 and 51 (see steps S30 and S31 in FIG. 5), a variable m is introduced, m = 2, and the routine proceeds to step 53. In steps 53 to 55, as shown in FIG. 8, the triac 34 is turned on at the timing of C1 (see steps S32 to 34 in FIG. 5). After step 55, it is determined in step 56 whether m = 2. If no, the process proceeds to step 57. In step 57, m = m + 1 is substituted for the current m. Since m = 1 is set in step 52, m becomes 2.

After the setting in step 52, step 53
, The zero-cross detection circuit 33 detects the zero-cross point, and outputs a zero-cross pulse at this zero-cross point. Thereafter, steps 53 to 55 are repeated, and C
At the timing of 1, the triac 34 is turned on. After step 55, it is determined in step 56 whether m = 2. Since m = 2 in step 57,
It is judged yes and returns.

Thereafter, similar processing is performed using the variable n,
That is, steps 62 to 69 are performed, and C2
At this timing, the triac 34 is turned on twice consecutively.

According to the second embodiment, the AC voltage on the positive polarity side and the AC voltage on the negative polarity side are made uniform. As a result, the generation of harmonics can be reduced, and the average value of the AC voltage becomes zero, so that the DC component to the electric blower 11 can be eliminated.

In the third embodiment, as shown in FIG. 9, four cycles of the AC power supply are set as one set so that the AC voltage on the positive polarity side and the AC voltage on the negative polarity side become uniform.
Also in this case, the generation of harmonics can be reduced, and the average value of the AC voltage becomes zero, so that the DC component to the electric blower 11 can be eliminated.

In the third embodiment, four cycles are set as one set. However, any cycle may be set as one set to perform phase control. For example, when three cycles are set as one set, two sets of three waveforms whose phases are controlled at a small phase angle and one set of phases controlled at a large phase angle are used as one set, and two sets are used in three cycles. By using two waveforms in three cycles as one set of one waveform controlled by a small phase angle and two waveforms controlled by a large phase angle,
Phase control at around 60% can be performed, and the degree of freedom of phase control can be increased. In addition, SIG1 in FIG.
As shown in 2 and 3, each waveform may be arranged such that the positive AC voltage and the negative AC voltage are equal in three cycles.

[0052]

As described above, according to the first aspect of the present invention, when the switching means is turned on and off to control the phase of the AC voltage, the generation of harmonics is suppressed in a setting range where the generation of harmonics is large. Since both large and small phase angles are used to reduce the power and the phase of the switch means is controlled so that the power according to the large and small phase angles corresponds to the set power, generation of harmonics can be suppressed. Further, it is possible to control the AC voltage over a wide range, and it is not necessary to add a new component for performing the control.

According to the second aspect of the present invention, the phase control of a long on-time and a short on-time is alternately performed in accordance with the magnitude of the power set by the setting means, which is longer than the time for turning on the switch means. By setting the time and the short on-time, generation of harmonics can be greatly reduced.

According to the third aspect of the present invention, the AC voltage on the positive polarity side and the AC voltage on the negative polarity side are equalized, so that the load can be smoothly controlled in accordance with the setting of the setting means. In addition, when the load is a motor, harsh sounds can be reduced.

According to the fourth aspect of the present invention, since the AC voltage on the positive polarity side and the AC voltage on the negative polarity side are equalized in a plurality of cycles, various controls of the control means are possible.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a vacuum cleaner using a power supply device according to the present invention.

FIG. 2 is a block diagram showing a configuration of a power supply device according to the present invention.

FIG. 3 is a flowchart showing an operation of input setting.

FIG. 4 is a flowchart showing control of a triac.

FIG. 5 is a flowchart showing a triac control.

FIG. 6 is a waveform diagram showing a triac operation.

FIG. 7 is a flowchart showing the operation of the second embodiment.

FIG. 8 is a waveform diagram showing an operation of a triac.

FIG. 9 is a waveform diagram showing an operation of a triac.

FIG. 10 is a waveform diagram showing an operation of a triac.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Electric blower 21-27 Operation switch (setting means) 31 AC power supply 34, 36 Triac (switch means) 35 Control part (control means)

Claims (4)

[Claims] 1. A power supply device comprising: switch means for flowing a current of an AC power supply to a load; and setting means for setting a magnitude of electric power supplied to the load, wherein the power set by the setting means is When the AC voltage is phase-controlled by turning on and off the switch means according to the magnitude, in a set range where many harmonics are generated, both large and small phase angles are used to reduce the generation of harmonics. And a control means for controlling the phase of the switch means so that the power according to the large and small phase angles corresponds to the set power. 2. The control means according to claim 1, wherein when the control means controls the phase of the switch means using both large and small phase angles, the control means controls a time required to turn on the switch means in accordance with the power level set by the setting means. 2. The power supply device according to claim 1, wherein the phase control for a long on-time and the phase control for a short on-time are alternately performed. 3. The control means according to claim 1, wherein when the phase control of the long on-time and the phase control of the short on-time are alternately performed, the positive side AC voltage and the negative side AC voltage are equalized. The power supply device according to claim 2, wherein 4. The control means controls the phase of the switch means using both large and small phase angles so that the positive AC voltage and the negative AC voltage are equal in a plurality of cycles. The power supply device according to claim 1, wherein: