JP2007040007A - Sanitary washing device, heating value control method, and program for executing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a warm water washing device which can vary power of a heating value by phase control, wherein the warm water washing device achieves reduction of power harmonic current and prevention of flicker caused by the phase control. <P>SOLUTION: The sanitary washing device 21 has a control means for controlling heating values of respective heaters (warm water heater 2, a toilet seat heater 3, a drying heater 4, and a room warming heater 5). The control means can apply slight fluctuation to a predetermined reference value of an ignition angle of the phase control, and therefore disperses harmonic generating frequencies of the harmonic occurring at a power source. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention includes hot water temperature control of a warm water washing toilet seat, toilet seat temperature control, hot air temperature control of drying, hot air temperature control of indoor heating (room warming), hot water temperature control of a water heater in an electric shower, etc. The present invention relates to power phase control.

  Conventionally, as shown in FIG. 13, this type of control means switches each heater individually to an AC power source 1 such as a warm water heater 2, a toilet seat heater 3, a drying heater 4, and a room heater 5. The control target values (warm water temperature target value, toilet seat temperature target value, drying temperature target value, room warming temperature target value) set by the temperature setting unit 10 and the temperature detection are connected to each of the triacs 6 to 9 connected in series. The temperature of each load detected by the unit 11 (warm water temperature, toilet seat temperature, drying temperature, room warming temperature) is compared by the ignition angle control unit 12 to calculate a phase angle necessary for control and output it to the trigger unit 13. The firing angle control unit 12 outputs a time value at which a predetermined phase angle is obtained with reference to the zero cross point detected by the zero cross point detection unit 14 to the trigger unit 13. The trigger unit 7 generates a pulsed ignition signal, controls the firing angle of the triacs 6-9 in addition to the triacs 6-9, increases or decreases the effective current applied to each load by phase control, and produces desired hot water Control was performed to obtain temperature, toilet seat temperature, drying temperature, and room warming temperature (see Patent Document 1).

  In this case, the current waveform flowing from the commercial power source to the load is not a sine wave, but a distorted waveform including many harmonics. In general, when the positive half-wave (upper half-wave) and negative half-wave (lower half-wave) are phase-controlled at the same firing angle, the current flowing into the load is an odd-numbered harmonic (odd-order harmonic) of the power supply frequency. To have. For example, when the power supply frequency is 60 Hz, frequencies other than 60 Hz such as 180 Hz, 300 Hz, and 420 Hz appear when the phase is controlled. In addition, when the effective voltage to be applied is changed by changing the firing angle in order to increase or decrease the power supplied to the load, even if it is periodically changed, it is an even multiple of the power supply frequency such as 120 Hz, 240 Hz, 360 Hz. When the firing angle is increased / decreased for each cycle, an odd-order harmonic of 30 Hz also appears. And the level of the harmonic current to generate | occur | produce is the highest when it ignites near the center of a sine wave half wave.

  For this reason, in another embodiment, there is a phase control method in which ignition is performed while avoiding an ignition angle at which a high-level harmonic current is generated (see Patent Document 2).

In yet another embodiment, the even harmonics are increased by increasing the even harmonics by creating asymmetry in the firing angle between all the multiple waves so that the power harmonic current does not concentrate on the odd harmonics. There are also examples to reduce. For example, for the reference firing angle α that gives the target supply power, the first full wave is actually fired at a firing angle α ′ larger than α, and at a firing angle α ″ smaller than the reference firing angle α ”. This is a method that gives the target power to the load when the next full wave is ignited and repeated on a time average basis, resulting in even harmonics in the power harmonic current, instead. Reduction of odd-order harmonics is realized (see Patent Document 3).
JP 2001-107434 A JP-A-8-255027 Japanese Patent Laid-Open No. 10-271891

Even in the phase control method as described above, a high-level harmonic current is likely to be generated at a frequency that is an integral multiple of the power supply frequency, which may adversely affect other devices connected to the same commercial power supply system.

  Specific adverse effects include the following.

  Devices with high harmonic current have low power factor. For this reason, since the apparent power is larger than the power actually consumed, a large amount of input current flows. Therefore, a margin is required for the power equipment.

  The power source is connected to each household from the power plant through a transmission line, a substation, a pole transformer, etc., and the power source line has an impedance. When a harmonic current flows, a voltage drop occurs due to its impedance, and as a result, the power supply voltage waveform becomes a waveform including harmonics. Since equipment used by connecting to a commercial power supply is normally made on the premise of use at a commercial frequency, application of a voltage waveform on which harmonics are superimposed may lead to unexpected problems.

  Examples of devices that are adversely affected by equipment and power distribution equipment connected to the power line due to the voltage waveform with superimposed harmonics include harmonic current flowing through the phase-advancing capacitor, heat generation, transformer malfunction, and voltage peaks. There are cases where the value drops and the switching power supply does not operate normally.

  As described above, since the power supply line has impedance, if the power supplied to the load is increased or decreased, the voltage drop also changes, and the voltage applied to other devices in the same power line system also changes. Increase or decrease. When the frequency of increase / decrease is high, when the other device is a lighting device, a so-called flicker phenomenon occurs, which gives a person discomfort due to flickering of lighting. The person feels flickering when the brightness change frequency is approximately 60 times or less per second, although it depends on the degree of change in brightness.

  In order to lower the harmonic current level by the method of Patent Document 2 of the conventional configuration example described above, the phase control is performed avoiding the firing angle that generates a large harmonic, and thus the point at which the firing angle changes abruptly occurs. As a result, sudden changes in electric power and rotational speed may occur, making it impossible to put it to practical use or worsening the feeling of use.

  Further, in order to lower the harmonic current level by the method of Patent Document 3 having the above-described conventional configuration, the difference between the large firing angle α ′ and the subsequent small firing angle α ″ must be increased. If this difference is too large, the flicker described above may occur, which may cause discomfort to the person.

  As described above, when the power applied to the load is controlled by the phase control, it is necessary to consider the flicker simultaneously with the power supply harmonic current.

  The present invention solves the above-described conventional problems, and generates less harmonic current that distorts the power supply waveform, changes in the power supply voltage every cycle of the power supply, and can be practically ignored in flickering of lighting fixtures. An object is to provide an apparatus.

  In order to solve the above-described conventional problem, the ignition angle is set around a predetermined reference ignition angle so that the harmonic component of the power supply frequency is dispersed into frequency components other than an integral multiple of the power supply frequency in the phase control. The electric power supplied to a heater such as an electric heater is controlled by finely changing the shape to obtain a desired reference value firing angle as an average value.

The sanitary washing device of the present invention has a fine ignition angle centered on a predetermined reference ignition angle so as to disperse the power harmonic current generated during the phase control of the heater into frequency components other than an integral multiple of the power frequency. By changing, it is possible to suppress the generation of harmonic currents within a predetermined allowable range at all firing angles of phase control, and to obtain a smooth power control operation with high output.

  1st invention is a sanitary washing apparatus provided with the control means which controls the emitted-heat amount of a heater by phase control of AC power supply, The said control means is a frequency other than the integral multiple of a power supply frequency, and the said control means is a frequency other than an integral multiple of a power supply frequency. Since the firing angle is changed so as to be dispersed into the components, the generation level of the harmonic current can be lowered. And generation | occurrence | production of the flicker of a lighting fixture can be suppressed.

  In the second aspect of the invention, the control of the first aspect of the invention is particularly set to a predetermined reference value necessary for controlling the ignition angle (indicating the reference value of the ignition angle in the power output for obtaining the predetermined calorific value of the heater). On the other hand, the firing angle was arbitrarily changed to large or small. In other words, the firing angle is arbitrarily changed so that the angle with respect to the predetermined reference value is a large angle or a small angle that is greater than or less than the predetermined reference value, or various angles with respect to the predetermined reference value. The harmonic current generated specifically in relation to the firing angle can be easily distributed to other frequency components other than an integral multiple of the power supply frequency. It is small and the occurrence of flicker can be suppressed.

  In the third aspect of the invention, in particular, the control of the first aspect of the invention changes the firing angle for every full wave with respect to a predetermined reference value, so that the positive / negative of the AC waveform is subject to up and down. The load on the pole transformer on the side can be reduced. Further, the harmonic current generated specifically in relation to the firing angle can be quickly dispersed into other frequency components other than an integral multiple of the power supply frequency, and the harmonic current can be reduced.

According to the fourth aspect of the invention, in particular, the control of the first aspect of the invention is to change the firing angle for each half wave with respect to the predetermined reference value, so that the harmonics generated specifically in relation to the firing angle. Dispersion of the wave current into other frequency components other than an integral multiple of the power supply frequency can be performed more rapidly.
In the fifth aspect of the invention, particularly in the control of the first aspect of the invention, the firing angle is changed within a predetermined range with respect to the predetermined reference value. The variation width of the voltage drop is limited, and the occurrence of flicker can be suppressed.

  In the sixth aspect of the invention, in particular, in the control of the first to fifth aspects of the invention, since the ignition angle is changed so that the average ignition angle becomes substantially the predetermined reference value, the heater per unit time Smoothly control the temperature of the load. Of course, it is desirable that the average firing angle be the same as the predetermined reference value. However, if there is no problem in the control of the equipment, a predetermined amount of power can be obtained, It is sufficient to control the change so that there is no problem.

  In the seventh aspect of the invention, in particular, the change width of the ignition angle that is changed with respect to the predetermined reference value in the control of the first to sixth aspects of the invention is changed randomly with respect to the predetermined reference value. The harmonic current generated in a specific pattern related to the corner can be dispersed without having regularity, the degree of decrease in the harmonic current is further increased, and regularity does not appear in the change of the power supply voltage.

  In the eighth aspect of the invention, in particular, the random number for determining the change width to be changed randomly with respect to the predetermined reference value of the firing angle in the control of the seventh aspect of the invention is generated from the longest sequence code. Random numbers can be easily generated by processing based on a shift register without having a random number table in the microcomputer to be used.

In the ninth aspect of the invention, in particular, by setting the number of bits of the shift register for generating the longest sequence code of the control of the eighth aspect to 3 bits or more, the number of random numbers can be made 7 or more, and the firing is substantially close to the random number. Angle fluctuation can be easily realized.

  In the tenth aspect of the invention, particularly in the control of the first to seventh aspects, the change width of the firing angle is changed with a plurality of fluctuation ranges set in advance with respect to the predetermined reference value. The harmonic current of the firing angle at all predetermined reference values can be confirmed by the test, and the generation of the unexpected harmonic current can be eliminated, and the circuit for generating the change of the firing angle can be simplified.

  In the eleventh aspect of the invention, in particular, the control of the first to tenth aspects of the invention is to change the change range of the ignition angle in accordance with the change of the predetermined reference value of the ignition angle. When the firing angle is small, the harmonic current can be dispersed and reduced by changing the firing angle composed of a small number of steps and cycles without bothering with lighting flicker.

  In the twelfth aspect of the invention, in particular, in the control of the first to eleventh aspects of the invention, the predetermined reference value of the firing angle of the phase control is 0 degrees, and since the change of the firing angle is stopped near 180 degrees, The ignition signal is advanced too far ahead of the phase angle 0 degree, is controlled later than 180 degrees, and what should be ignited in the vicinity of 180 degrees does not ignite, or what should be ignited originally It is possible to prevent false ignition such as conduction by 180 degrees in the opposite half wave.

  According to a thirteenth aspect of the present invention, in the control method for controlling the power of the sanitary washing device by phase control of the AC power source, the firing angle is set so as to disperse the power harmonic current component into frequency components other than an integral multiple of the power frequency. This is a power control method to be changed, and can reduce the generation level of harmonic current and suppress the occurrence of flicker phenomenon.

  In a fourteenth aspect based on the thirteenth aspect, the steps of setting a power value, setting a reference firing angle, and setting the firing angle by swinging with respect to the reference firing angle. The calorific value control method is characterized in that an average value of a predetermined number of half-waves of the swayed firing angle is substantially a reference firing angle. Thereby, the harmonic current can be dispersed by changing the reference firing angle. The firing angle that can be shaken can also be set by setting the amount of fluctuation in advance so that the average firing angle is approximately the reference firing angle, or by calculating and setting each time. The effect of.

  The fifteenth invention is a program for causing a computer to execute all or part of the heat generation amount control method of the thirteenth or fourteenth invention.

  And since it is a program, a part or all of the sanitary washing apparatus of this invention can be easily implement | achieved using a general purpose computer or a server. Also, program distribution and installation can be simplified by recording on a recording medium or distributing the program using a communication line.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 shows a block diagram of the control means of the sanitary washing apparatus in the first embodiment of the present invention.

AC power supply 1, each load of warm water heater 2, toilet seat heater 3, drying heater 4, and room warming heater 5, which are heaters, triacs 6-9, temperature setting unit 10, temperature detection unit 11, and ignition The angle control unit 12, the trigger unit 13, the firing angle control unit 12, and the zero cross point detection unit 14 are the same as those in the conventional example. In the present invention, the fluctuation control unit 1 is interposed between the firing angle control unit 12 and the trigger unit 13.
5 was newly provided.

  The temperature setting unit 10 sets a desired hot water temperature target value, toilet seat temperature target value, drying temperature target value, and room warming temperature target value set by the user as in the conventional example.

  Each sensor (not shown) of the temperature detection unit 11 provided in each load of the hot water heater 2, the toilet seat heater 3, the drying heater 4, and the room warming heater 5 is a temperature of each load (warm water temperature, toilet seat temperature, drying temperature, chamber). (Warm temperature) is converted into an electrical signal and sent to the firing angle control unit 12. The ignition angle control unit 12 compares the value of the temperature setting unit 10 and the value of the temperature detection unit 11 to determine the ignition angle (hereinafter referred to as a predetermined reference value of the ignition angle), and is obtained from the zero cross point detection unit 14. A time value corresponding to a predetermined reference value of the firing angle with respect to the zero cross point of the power supply is output to the fluctuation control unit 15. The fluctuation control unit 15 varies the ignition angle in each power supply cycle around the predetermined reference value of the ignition angle received from the ignition angle control unit 12, adds fluctuation, and outputs the fluctuation to the trigger unit 13. The ignition angle control unit 12 and the fluctuation control unit 15 are configured by a microcomputer, a memory, and the like, and an ignition signal obtained by changing the ignition angle based on the change width setting data set in the memory of the fluctuation control unit 15. Send to trigger unit 13. The trigger unit 13 generates a pulse signal, fires the triacs 6 to 9, and performs phase control.

  FIG. 2 is a perspective view showing a state in which the sanitary washing device according to the first embodiment of the present invention is mounted on a toilet.

  As shown in FIG. 2, a sanitary washing device 21 is mounted on the toilet bowl 20. The tank 22 is connected to a water pipe and supplies cleaning water into the toilet bowl 20.

  The sanitary washing device 21 includes a main body portion 23, a remote operation device 24, a toilet seat portion 25, and a lid portion 26.

  A toilet seat 25 and a lid 26 are attached to the main body 23 so as to be freely opened and closed. Further, the main body portion 23 is provided with a cleaning water supply mechanism including a nozzle portion 27 and a control portion is incorporated. The control unit of the main body unit 23 controls the cleaning water supply mechanism based on a signal transmitted by the remote operation device 24 as will be described later. Furthermore, the toilet seat heater 3 is built in the toilet seat portion 25, and the main body portion 23 has a hot air supply device (not shown) for drying, a deodorizing device (not shown), and a room heating device. A room warming device (not shown) is housed. The warm air supply device and the room warming device incorporate the above-described drying heater 4 and room warming heater 5, respectively.

  FIG. 3 is a schematic diagram showing an example of the remote control device 24 of FIG.

  As shown in FIG. 2, the remote control device 24 includes a plurality of LEDs (light emitting diodes) 28, a plurality of adjustment switches 29 to 34, a butt switch 35, a bidet switch 36, a drying switch 37, a deodorizing switch 38, and a room warming switch 39. And a stop switch 40.

  The user presses down the adjustment switches 29 to 34, the butt switch 35, the bidet switch 36, the drying switch 37, the deodorizing switch 38, the room warming switch 39, and the stop switch 40. Thereby, the remote operation device 24 wirelessly transmits a predetermined signal to a control unit provided in the main body 23 of the sanitary washing device 21 described later. The control unit of the main body unit 23 receives a predetermined signal wirelessly transmitted from the remote operation device 24, and controls the washing water supply mechanism and the like.

For example, when the user depresses the butt switch 35 or the bidet switch 36, the nozzle part 27 of the main body part 23 in FIG. 2 moves and the washing water is ejected. By depressing “high” of the adjustment switch 31, the hot water temperature target value of the water heater of the washing water supply mechanism of the main body 23 in FIG. 2 is changed, and the hot water temperature rises. By depressing the stop switch 40, the ejection of the washing water from the nozzle portion 27 is stopped.

  Further, when the drying switch 37 is pressed, hot air is jetted from a hot air supply device (not shown) of the sanitary washing device 21 to a local part of the human body. By depressing the deodorizing switch 38, the deodorizing device (not shown) of the sanitary washing device 21 deodorizes the surrounding area. When the room warming switch 39 is further pressed, warm air is jetted from the room warming device (not shown) of the sanitary washing device 21 to the entire toilet.

  If the user depresses the adjustment switches 29 to 34 and the butt switch 35 or the bidet switch 36 is being depressed, the position of the nozzle portion 27 of the main body 23 of the sanitary washing device 21 in FIG. 2 changes. Or the temperature of the wash water ejected from the nozzle part 27 changes, or the pressure of the wash water ejected from the nozzle part 27 changes. If the drying switch 37 or the room warming switch 39 is being pressed, the warm air temperature changes. Furthermore, a plurality of LEDs (light emitting diodes) 28 are turned on as the adjustment switches 29 to 34 are pressed.

  Hereinafter, a cleaning water supply mechanism of a sanitary cleaning device according to an embodiment of the present invention will be described. FIG. 4 is a schematic diagram showing the configuration of the cleaning water supply mechanism of the sanitary cleaning device according to one embodiment of the present invention.

  The washing water supply mechanism is configured to control the hot water heater 2 of the control means described in FIG.

  The main body 23 shown in FIG. 4 includes a control unit 41, a branch tap 42, a strainer 43, a check valve 44, a constant flow valve 45, a water stop electromagnetic valve 46, a flow sensor 47, a heat exchanger 48, and a water supply temperature sensor 49. , A hot water temperature sensor 50, a thermostat 51, a pump 52, a switching valve 53 and a nozzle part 27. The nozzle unit 27 includes a buttocks nozzle 54, a bidet nozzle 55, and a nozzle cleaning nozzle 56.

  The hot water temperature sensor 50 is one sensor in the temperature detection unit 11 in FIG.

  As shown in FIG. 4, a branch tap 42 is inserted in the water pipe 57. In addition, a strainer 43, a check valve 44, a constant flow valve 45, a water stop electromagnetic valve 46, a flow sensor 47, and a feed water temperature sensor 49 are connected to a pipe 58 connected between the branch faucet 42 and the heat exchanger 48. They are inserted in order. Further, a hot water temperature sensor 50 and a pump 52 are inserted in a pipe 59 connected between the heat exchanger 48 and the switching valve 53.

  First, the purified water flowing through the water pipe 57 is supplied to the strainer 43 by the branch faucet 42 as cleaning water. The strainer 43 removes dust and impurities contained in the cleaning water. Next, the check valve 44 prevents backflow of the cleaning water in the pipe 58. And the flow volume of the washing water which flows through the piping 58 by the constant flow valve 45 is maintained constant.

  A relief pipe 60 is connected between the pump 52 and the switching valve 53, and a relief water pipe 61 is connected between the water stop electromagnetic valve 46 and the flow rate sensor 47. A relief valve 62 is inserted in the relief pipe 60. The relief valve 62 is opened when the pressure on the downstream side of the pipe 52, particularly the downstream side of the pump 52, exceeds a predetermined value, and prevents problems such as damage to the equipment and disconnection of the hose at the time of abnormality. On the other hand, of the wash water supplied with the flow rate adjusted by the constant flow valve 45, the wash water that is not sucked by the pump 52 is released and discharged from the water pipe 60. Thereby, a predetermined back pressure acts on the pump 52 without being influenced by the water supply pressure.

Next, the flow rate sensor 47 measures the flow rate of the cleaning water flowing in the pipe 58 and gives the measured flow rate value to the control unit 41. Further, the feed water temperature sensor 49 measures the temperature of the cleaning water flowing in the pipe 58 and gives a temperature measurement value to the control unit 41.

  Subsequently, the hot water heater 2 is built in the heat exchanger 48, and the hot water heater 2 is energized and controlled based on a control signal given by the control unit 41 to heat the wash water supplied through the pipe 58. The hot water temperature sensor 50 measures the temperature of the wash water heated by the heat exchanger 11 and gives a hot water temperature signal to the control unit 41. The control unit 41 sets the hot water temperature so that the hot water temperature becomes a desired hot water temperature target value. The heating amount of the heater 2 is feedback controlled. The thermostat 51 detects the temperature of the hot water from the heat exchanger 48 and shuts off the power supply to the hot water heater 2 when a predetermined temperature is exceeded.

  The desired hot water temperature target value described above is a value set by the adjustment switches 31 and 32 of the remote control device 24, and represents one of the setting items of the temperature setting unit 10 in FIG.

  The pump 52 pumps the cleaning water heated by the heat exchanger 48 to the switching valve 53 based on a control signal given by the control unit 41. The switching valve 53 supplies cleaning water to any one of the assault nozzle 54, the bidet nozzle 55, and the nozzle cleaning nozzle 56 of the nozzle unit 27 based on a control signal given by the control unit 41. Accordingly, the cleaning water is ejected from any one of the buttocks nozzle 54, the bidet nozzle 55 and the nozzle cleaning nozzle 56.

  The control unit 41 in the washing water supply mechanism receives a signal wirelessly transmitted from the remote operation device 24 in FIG. 2, a measured flow rate value given from the flow rate sensor 47, a temperature measurement value given from the feed water temperature sensor 49, and a hot water temperature sensor 50. A control signal is given to the water stop solenoid valve 46, the heat exchanger 48, the pump 52, and the switching valve 53 based on the given hot water temperature signal.

  Next, the phase control operation in the control means described with reference to FIG. 1 will be described.

  FIG. 5 is a diagram showing a change in the ignition phase angle for each power supply cycle given to the fluctuation control unit 15. Each cycle (full wave) is centered on a predetermined reference value α of the ignition angle indicated by the dotted line in FIG. The firing angles of the first cycle, the second cycle, and the nth cycle are changed at the firing angles α1, α2, and αn, which are changed by different variation angles (Δαn). In addition, the firing angle of the positive / negative cycle of each cycle is the same.

  (Table 1) is an example of a condition table in the cycle order of the fluctuation angle (Δθn) described with reference to FIG. 5 given by the fluctuation control unit 9 to the predetermined reference value α of the firing angle. 1 is ± 1.13 degrees, Level 2 is ± 2.26 degrees, Level 3 is ± 3.4 degrees, Level 4 is ± 4.53 degrees, and random numbers are divided into 15 levels between the positive and negative maximum values. The table shows an example of assignment and change in order of cycle.

  When n on the left side of (Table 1) changes from 1 to 15, it returns to 1 again and repeats the same fluctuation. Therefore, the fluctuation change periodically repeats the same change.

  As the number of fluctuation angles (number of random numbers) increases, more random numbers can be obtained. However, if the number is too large, the fluctuation cycle becomes longer, and if power harmonics are measured in a short time, different results are obtained for each measurement. The trouble that it is done occurs.

  In (Table 1), in the level 1 condition, the first cycle is a predetermined reference value + 1.13 degrees, and in the second cycle, the predetermined reference value is -0.16 degrees, and the following 15 cycles are one cycle. The arc angle was changed.

  Level 0 indicates no fluctuation change.

  The operation and action when the amount of heat generated by the hot water heater 2 is controlled using the sanitary washing apparatus configured as described above will be described below.

  In the load of the hot water heater 2 of 1200 watts, the results of examining the generation of harmonics and the occurrence of lighting flicker with and without the conditions of the fluctuation change angle table of Table 1 are described below.

FIG. 6 shows that when a predetermined reference value of the firing angle is 90 degrees (a calorific value of about 600 watts) and phase control is performed by adding a level 3 change in the fluctuation angle table of Table 1, the predetermined allowable range is JIS C6100.
The distribution of power harmonic currents up to the 40th order is shown as an experiment based on 0-3-2 limit value-harmonic current generation limit value.

  In FIG. 6, a white line indicates a limit value (hereinafter referred to as a limit value) defined in JIS C61000-3-2 for each harmonic order, and a black line indicates an actual measurement value.

  All the harmonics are below the limit value, and the minimum margin among the margins indicating the ratio between the limit value of the harmonics of each order up to the 40th order and the actual measurement value is 35.1%. The flicker was not observed in the flicker test of the lighting fixtures obtained at the same time.

  FIG. 7 shows the distribution of the power supply harmonic current when the predetermined reference value of the firing angle is 90 degrees and there is no fluctuation change. The actually measured values indicate that the generation of harmonic currents is large because all the odd-order harmonic currents above the 13th-order harmonic currents exceed the limit values. In addition, flicker was not observed in the flicker test of the lighting equipment performed at the same time.

  When FIG. 6 is compared with FIG. 7, it can be determined that even-order harmonic currents are generated in FIG. 6 and that harmonic currents are dispersed due to fluctuations in the firing angle.

  Further, in FIG. 7, only current components having a frequency that is an integral multiple of the power supply frequency are displayed. However, if the firing angle is randomly varied as in the present invention, the frequency component of the harmonic current is not an integral multiple of the power supply frequency. It also occurs at other frequencies.

  The fluctuation change in (Table 1) periodically repeats the same change, and in the case of the present embodiment, the repetition frequency is 4 Hz which is 1/15 of the power supply frequency 60 Hz. Actually, the frequency component of the harmonic current in the case of the fluctuation depends on the cycle of the random number, and when the number of random numbers is 15, the cycle of the power source frequency is 15 cycles. Distributed at 4 Hz intervals. For example, 180 Hz third harmonic current is 184 Hz, 188 Hz, 192 Hz,..., And 176 Hz, 172 Hz, 168 Hz,... The harmonic current components present there are distributed to the surrounding frequencies at intervals of 4 Hz, and as a result, high level harmonic current components are reduced.

  FIG. 8 shows the Fourier analysis result when the predetermined reference value of the firing angle is 90 degrees and the phase is controlled by adding the level 3 change in the fluctuation angle table of Table 1. The vertical axis represents the relative value of the harmonic current level, and the amplitude of a 60 Hz sine wave without distortion is set to 1 as a reference.

  In this way, when the firing angle is fluctuated, there are harmonic currents distributed at intervals of 4 Hz around each frequency that is an odd multiple of the power supply frequency of 60 Hz.

For comparison with FIG. 8, the predetermined reference value of the firing angle is set to 90 degrees, and phase control is performed by alternating two firing angles of +3.4 degrees and -3.4 degrees every cycle. It is a Fourier analysis result of time. Since the same firing angle is repeated every two cycles of the power supply frequency, a harmonic current exists at a frequency that is an odd multiple of 30 Hz. Moreover, this odd harmonic current of 30 Hz is higher than the odd harmonic current level of 60 Hz at a frequency of 990 Hz to 2130 Hz. Furthermore, the harmonic current of an odd multiple of 30 Hz in FIG. 9 is a harmonic current having a level considerably higher than the harmonic current level of the same frequency in FIG. 8 when the firing angle is fluctuated. In addition, if the number of types of random numbers is more than 15, for example, 45, the cycle in which the random number circulates is 45 cycles of the power supply frequency. The harmonic current component that was an integer multiple of is further finely distributed to the surrounding frequency at finer 1.33 Hz intervals, and as a result, the higher level harmonic current component is further reduced.

  FIG. 10 shows the observation of the minimum margin rate when the predetermined reference value of the firing angle is 90 degrees, the level 1 to 4 of the fluctuation angle change table shown in (Table 1), and the condition without fluctuation change (level 0). It is a figure which shows data.

  The minimum margin rate is −42% without fluctuation change, −30% for fluctuation change level 1 and −0.3% limit for level 2 but 35.1% for level 3 and 36 for level 4 There is a margin of 5%. At this time, the flicker observed at the same time was not observed from level 0 to level 3 of the fluctuation change, but at level 4, a slight flicker was observed. This is because the change width at level 4 is larger than that at level 3, but if the change width becomes too large, the flicker phenomenon is induced. Therefore, when a predetermined allowable range is set as a JIS standard, a satisfactory result can be obtained with a level 3 fluctuation change from the observation of the minimum margin ratio and flicker. Therefore, level 3 is the most preferable value for fluctuation change when the predetermined reference value of the firing angle at the electric heating load of 1200 W is 90 degrees.

  When the heater of the sanitary washing device is controlled by the calorific value control method of the present embodiment, the lighting apparatus is connected to the electrical equipment connected in parallel or adjacent to the end of the indoor wiring branched from the distribution board of the commercial power supply Is included, the flicker phenomenon of the lighting fixture is prevented. In general, sanitary washing devices used in the home are very likely to be connected adjacent to lighting equipment in the room due to the wiring of the AC power supply, and flicker occurs when used simultaneously with lighting. This is very uncomfortable for the user. Therefore, it is indispensable to determine a fluctuation change level based on a margin ratio in the allowable range of harmonics and a flicker phenomenon occurrence state. Therefore, as in this embodiment, it is desirable to determine the marginal rate with respect to the predetermined allowable range and the level at which the firing angle is fluctuated and fluctuated based on the occurrence of the flicker phenomenon. The determination may be made based only on the margin rate.

  Next, in FIG. 11, the fluctuation change is fixed at level 3, and the predetermined reference value of the firing angle is 55 degrees (heat generation amount 1000 W), 74 degrees (heat generation amount 800 W), 104 degrees (heat generation amount 400 W), 124 degrees ( The generation of harmonic current and flicker were tested by changing the calorific value to 200W, but the minimum margins were 45.3%, 27.9%, 35.1%, 31.6%, 40.9%, respectively. In both cases, good results were obtained and no flicker occurred.

  When the fluctuation change angle shown in (Table 1) is further described, the phase angle is changed to be larger or smaller than the predetermined reference value. By this, the average per cycle (one random number period) of the fluctuation change is obtained. The value is set to zero, and a predetermined reference value is realized for each period (15 cycles) of fluctuation change.

  Next, the phase angle is changed for each full wave with respect to a predetermined reference value, but this causes a direct current component in the power supply if the effective value of the positive and negative cycles is different, and magnetic saturation is caused in the transformer of other electrical equipment. This is to avoid this because it has an adverse effect.

  However, since one cycle of fluctuation change is composed of 15 cycles, it is not shown in Table 1. However, if the direction of change is reversed between the first cycle and the next cycle of fluctuation change, the power supply will be adversely affected. It can be changed every half wave without affecting, and the harmonic current can be more finely distributed.

  Furthermore, in Table 1, the fluctuation change with respect to a predetermined reference value is changed within a predetermined range, thereby restricting the dispersion of harmonic currents and preventing the occurrence of lighting flicker.

  Furthermore, the fluctuation range of the fluctuation change with respect to the predetermined reference value is set to a preset value. If the power consumption of the load is reduced, the harmonic current can be reduced with a smaller number of steps and a smaller fluctuation change width than the fluctuation change angle table of Table 1.

  Further, when determining the fluctuation firing angle, the minimum margin tends to increase as the firing angle approaches 0 degree or 180 degrees as shown in FIG. Above the degree, the change in power with respect to the fluctuation range of the same firing angle is reduced, so that the occurrence of flicker is reduced, and the change range of fluctuation change can be reduced or the change step can be reduced. Furthermore, when the firing angle is 0 degree or in the vicinity of 180 degrees, the generation of the harmonic current is small even if the fluctuation range is not provided, and the firing angle advances from 0 degrees to cause the firing failure or from 180 degrees. It is possible to prevent erroneous ignition in the reverse phase with a delay.

  In the device control of the present embodiment, desirably, if the predetermined reference value of the firing angle is controlled within ± 5 degrees of 0 degrees or 180 degrees, it is possible to perform the control according to the present embodiment without changing. It is possible to reduce the generation of harmonics without departing from the predetermined allowable range.

  Furthermore, the fluctuation change level and period shown in (Table 1) are higher than the harmonic current even if other fluctuation change angle and period conditions are used, such as toilet seat heater, drying heater, room heater, etc. Can be reduced below the limit value and flickering in the lighting fixture can be prevented, so that the conditions in Table 1 are not constrained.

  Further, if the random number for causing the fluctuation change is generated in the longest sequence code without having the table format as shown in Table 1, the processing of the microcomputer that controls the control can be performed more easily.

  Furthermore, by setting the longest sequence code to 3 bits or more, one cycle of fluctuation change can be set to 15 cycles, and a random number with substantially no bias can be generated.

  FIG. 12 is a flowchart for explaining the method of controlling the amount of heat generated by water heater 48 in the first embodiment of the present invention, and only describes the main loop that is repeatedly performed. In FIG. 12, STEP1 observes the voltage waveform of the power supply 1 and detects the zero cross point at which the voltage becomes zero volts. If it can be detected, it branches to STEP2, and if not, it branches to STEP12.

  From STEP2 to STEP11, processing is performed immediately after detecting the zero cross point. First, in STEP2, the timer is reset. This timer is constituted by hardware in the microcomputer, and counts at regular intervals (for example, every 1 microsecond) independently of program execution. From the program, the timer value can be read out and set through a variable Tim.

  STEP 3 increments the 15-digit counter variable Cnt set in the program. This counter is for counting the number of all waves of the AC power supply. In the first embodiment, the 15-digit counter variable Cnt is incremented every 2 half-waves to form a 15-digit counter. That is, the count value is from 0 to 14 until it is detected 30 times such as 0, 0, 1, 1, 2, 2,... 13, 13, 14, 14 every time a zero-cross point for each half wave is detected. Count up. Then, after 14 it returns to 0.

STEP 4 is to read the hot water temperature target value set by the user by pressing down the adjustment switches 31 and 32 of the remote control device 24 through the temperature setting unit 10. The setting value is read each time a zero-cross point is detected so that the user can immediately follow the setting even if the setting is frequently changed.

  STEP 5 reads the value of the hot water temperature sensor 50 of the temperature detector 11 and calculates a deviation from the current temperature with respect to the hot water temperature target value.

  STEP 6 calculates the required heat generation amount to the hot water heater 2 from the result calculated in STEP 5. Here, feedback control is performed using a known PID control so that the temperature deviation approaches zero. For example, if the current temperature is sufficiently lower than the set temperature immediately after the start of operation, the calorific value of the rated power is calculated. Further, for example, when the current hot water temperature is still lower than the hot water temperature target value but is gradually approaching, an operation such as calculating the heat generation amount of 75% of the rated power is performed.

  In STEP 7, the reference firing angle is calculated from the calorific value calculated in STEP 6. For example, when 75% of the rated power is required, the reference firing angle is set to 60 degrees. This calculation can be performed by performing a trigonometric function calculation in the program, or by referring to a table in which the desired power value is associated with the firing angle.

  In STEP 8, it is determined whether or not a fluctuation change is given to the reference firing angle. Here, when the reference firing angle α is 5 degrees (185 degrees) or less or 175 degrees (355 degrees) or more, it is determined that the fluctuation change is prohibited, and the process proceeds to STEP9. On the other hand, if the reference firing angle α is more than 5 degrees (185 degrees) and less than 175 degrees (355 degrees), it is determined that the fluctuation change is given, and the process proceeds to STEP10.

In STEP 9, in order to prohibit the fluctuation change, the fluctuation change angle Δαn is set to zero.

STEP 10 obtains Δαn from a table (see Table 1) from which the fluctuation change angle Δαn previously configured in the program can be extracted. Here, n is the value of the decimal counter variable Cnt, and the fluctuation change angle Δαn every time the decimal counter variable Cnt is incremented.
Switches.

STEP 11 calculates a delay time value τ from the zero cross point of the power supply voltage waveform corresponding to the ignition angle α + Δαn obtained by adding the fluctuation change angle Δαn to the reference ignition angle α. Then return to STEP1.

  Here, when calculating the delay time value τ from the firing angle, there are cases where the power supply frequency is 50 Hz or 60 Hz in Japan, so it is necessary to set which power supply frequency is in advance. Since this is a very general process that needs to be performed once immediately after the power is turned on, the description of the determination process of the power supply frequency is omitted in this flowchart that describes only the main loop that is repeatedly performed.

  On the other hand, if the zero cross point cannot be detected in STEP 1, the process branches to STEP 12, and the value of the timer Tim is examined. Here, if the value of Tim is equal to τ, the process proceeds to STEP 13 because the time corresponding to the firing angle α + Δαn has elapsed from the zero cross point. Similarly, if the value of the timer Tim is not equal to τ in STEP12, the process returns to STEP1.

STEP 13 outputs a trigger pulse to turn on the triac 6 and start energizing the hot water heater 2. Since the triac 6 does not return to the initial off state unless the current becomes zero once it is turned on, it cannot be turned off from the microcomputer. However, when the AC power supply voltage reaches the zero cross point, the current flowing through the triac 3 also becomes zero. At the zero cross point, the triac 6 is also turned off to return to the initial state.

  The reference power control for changing the firing angle can be easily performed by the program configuration in which processing is performed in synchronization with the half-wave cycle of the AC power supply as described above.

  As described above, in the first embodiment of the present invention, the deviation between the desired hot water temperature target value set by the user in the temperature setting unit 10 and the electrical signal of the hot water temperature sensor 50 in the temperature detection unit 11 is small. Although the feedback control for controlling the above is described, the toilet seat temperature target value, the drying temperature target value, and the room warming temperature target that are set by the temperature setting unit 10 for the toilet seat heater 3, the drying heater 4, and the room warming heater 5 are also described. A similar calorific value control method can be used when feedback control is performed so that the deviation between the value and the toilet seat temperature, the drying temperature, and the room warming temperature detected by the temperature detector 11 is small.

  Similarly, feedback control is used so that a motor used in a blower or a vacuum cleaner provided with a rotation speed sensor has a desired rotation speed. In such motor phase control, the method of dispersing harmonic components by changing the firing angle of the present invention works effectively.

  In addition, although not feedback control, there is also feedforward control that performs phase control of electric power according to external factors such as tap water temperature and air temperature, but even in this case, the ignition angle of the present invention is changed as in feedback control. Thus, a method of dispersing harmonic components is effective.

  On the other hand, even if power phase control is used, phase control is performed at a preset reference phase angle without performing feedback control when there are few fluctuation factors for the power load or when the control accuracy requirement for the power load is low. There is constant control to do. Such constant control is also widely used because it requires no sensor and simplifies the control configuration. For example, when controlling the power at a constant 600 W in a cooker rated at 1200 W, if the reference firing angle is controlled at a constant 90 degrees, a constant power of approximately 600 W can be obtained. Absent. Even in such constant value control, the method of dispersing harmonic components by changing the firing angle of the present invention works effectively.

  As described above, the sanitary washing device according to the present invention supplies, for example, a harmonic current generated by the phase control by giving a slight change of about ± 3.4 degrees to the phase control as one cycle for 15 cycles. It can be dispersed into frequency components other than an integral multiple of the frequency, and flickering of the lighting fixture does not occur. Therefore, high wattage load can be controlled smoothly, so it is generally used for many other than home use etc. such as watt control of electric heating load, temperature control, brightness adjustment of lighting equipment, rotation speed control of electric appliances etc. The present invention can be used for a power control method and a power control apparatus for an electric appliance.

The block diagram of the control means of the sanitary washing apparatus in Embodiment 1 of this invention The perspective view of the sanitary washing apparatus in Embodiment 1 of this invention The schematic diagram of the remote control apparatus of the sanitary washing apparatus in Embodiment 1 of this invention The schematic diagram of the washing water supply mechanism of the sanitary washing apparatus in Embodiment 1 of this invention Diagram showing fluctuation of firing angle of in-phase control The graph which shows the harmonic current distribution at the time of the fluctuation of the phase control of the present invention Graph showing harmonic current distribution of conventional phase control The graph which shows the Fourier analysis of the phase control of this invention Graph showing Fourier analysis of conventional phase control The graph which shows the fluctuation change condition of the phase control of this invention, and the change of the minimum margin The graph which shows the change of the predetermined reference value and minimum margin of the starting angle of phase control of the present invention The flowchart explaining the control method of this invention Block diagram of control means of a conventional sanitary washing device

Explanation of symbols

2 Hot water heater (heater)
3 Toilet seat heater (heater)
4 Drying heater (heater)
5 Room heater (heater)
DESCRIPTION OF SYMBOLS 10 Temperature setting part 11 Temperature detection part 12 Firing angle control part 14 Zero cross point detection part 15 Fluctuation control part 21 Sanitary washing apparatus

Claims (15)

A heater and a control means for controlling the heater by phase control of an AC power supply, wherein the control means sets the firing angle so as to disperse the power harmonic current component into a frequency component other than an integral multiple of the power supply frequency. A sanitary washing device designed to change. The sanitary washing device according to claim 1, wherein a predetermined reference value of an ignition angle for determining a heating value of the heater is provided, and the ignition angle is arbitrarily changed to a large value or a small value with respect to the predetermined reference value. 2. The sanitary washing device according to claim 1, wherein a predetermined reference value of an ignition angle that determines the amount of heat generated by the heater is provided, and the ignition angle is changed for each full wave with respect to the predetermined reference value. 2. The sanitary washing device according to claim 1, wherein a predetermined reference value of an ignition angle for determining a heat generation amount of the heater is provided, and the ignition angle is changed for each half wave with respect to the predetermined reference value. The sanitary washing device according to claim 1, wherein a predetermined reference value of an ignition angle for determining a heating value of the heater is provided, and the ignition angle is changed within a predetermined range with respect to the predetermined reference value. The sanitary washing device according to any one of claims 1 to 5, wherein the average angle per unit time of the changed firing angle is substantially a predetermined reference value. The sanitary washing device according to any one of claims 1 to 6, wherein a predetermined reference value of an ignition angle for determining a heating value of the heater is provided, and the ignition angle is randomly changed with respect to the predetermined reference value. The sanitary washing device according to claim 7, wherein a random number for randomly changing is generated from the longest sequence code. The sanitary washing device according to claim 8, wherein the number of bits of the longest sequence code is 3 bits or more. The sanitary washing device according to any one of claims 1 to 7, wherein the ignition angle is changed based on a preset value with respect to a predetermined reference value. The sanitary washing device according to claim 1, wherein a predetermined reference value of an ignition angle for determining a heating value of the heater is provided, and a range in which the ignition angle is changed is changed according to the change of the predetermined reference value. The sanitary washing device according to any one of claims 2 to 11, wherein the change of the ignition angle is stopped when the predetermined reference value of the ignition angle is around 0 degree or 180 degrees. In a control method that controls the amount of heat generated by changing the power of the heater of the sanitary washing device by phase control of the AC power supply, the power supply harmonic current component is ignited to be distributed to frequency components other than integer multiples of the power supply frequency. A calorific value control method that changes the angle. A step of setting a power value; a step of setting a reference firing angle; and a step of setting a firing angle by swinging with respect to the reference firing angle, the predetermined number of times of the shaken firing angle. The calorific value control method according to claim 13, wherein an average value of the half-waves is substantially a reference firing angle. The program for making a computer perform all or one part of the calorific value control method of Claim 13 or 14.