JP2001107434A - Heater controller for sanitary washing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a temperature control having a high accuracy by preventing erroneous arc firing or extinction of a switching means for applying AC voltage to a heater. SOLUTION: In response to the heater output request values, the power applying method to the heater is switched between an ordinary phase control and an intermittent phase control, further, the pulse width of ON signal to a switching means for applying the AC voltage to the heater is set to a width permitting definitely to turn ON the switching means and to a minimum value, thereby preventing the erroneous arc firing or extinction and preventing the erroneous firing or extinction thereby permitting accurate temperature control and heater output in a wide range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater control device of a sanitary washing device for controlling the phase of a heater driven by a commercial power supply so that an object to be heated can reach a desired temperature.

[0002]

2. Description of the Related Art In recent years, in a sanitary washing device for washing a local part of a human body, a hot water control function for controlling a temperature of a local washing water, a toilet seat temperature controlling function for controlling a toilet seat temperature, and a drying temperature controlling function for a local drying. In general, those having a heater function such as a room temperature control function for indoor heating are common.

In the case where the heaters are AC drive heaters, a means for applying an AC voltage to the heater by outputting an ON signal to a switching means such as a triac is generally used. It is known that phase control for controlling a conduction angle to a heater is an effective means for temperature control requiring quick and accurate operation.

A specific method of phase control is to calculate the amount of electric power to be supplied to the heater and the conduction angle according to the amount of electric power from the temperature of the object to be heated and the target temperature of the object to be heated, and apply the electric power to the heater. An ON command is output to the switching means after a lapse of a predetermined time from the zero-cross point of the AC power supply so that the conduction angle becomes the calculated value, and the heater is energized to the next zero-cross point.

[0005]

When the temperature is controlled by the phase control of the AC-driven heater, the ON / OFF timing of the switching means is controlled based on the zero-cross point as described above. If a delay of the zero-cross detection circuit, a delay of the zero-cross detection interrupt processing, or the like occurs, the ON / OFF timing to the switching means is delayed. If the ON signal is delayed, the switching means cannot be turned ON and an OFF signal is sent. In this case, a phenomenon that cannot be turned off occurs.

This will be described in detail with reference to FIGS. T1 is an energization time according to a desired power amount, and T2 is a heater ON delay time based on a zero cross point. Here, if the detection of the zero-cross point is delayed at the time of the low output request,
The reference point of No. 2 is shifted, and the output timing of the ON signal is also shifted accordingly.

[0007] Switching means represented by a triac cannot be turned on at a voltage lower than that.
There is a voltage level V1 and the output timing of the ON signal is O
If it enters an area where N cannot be performed, the heater is not energized in the half cycle of the voltage waveform (erroneous arc extinction).

Further, the delay of the output timing of the OFF signal becomes a problem regardless of the magnitude of the output request, and if the output signal is shifted to the ON region of the next half cycle of the voltage waveform, the heater remains energized (erroneous firing). ).

In either case, an error occurs between the required output and the actual output, and accurate temperature control cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is an object of the present invention to prevent erroneous ignition or extinction of a switching means for applying an AC voltage to a heater and realize accurate temperature control. An object of the present invention is to provide a heater control device of a sanitary washing device that is possible.

[0011]

In order to solve the above-mentioned problems, a first aspect of the present invention is to control a heating device such as a heater driven by a commercial power supply, and to control an AC voltage of the commercial power supply to the heating device. Switching means such as a triac, a zero-cross detection means for detecting a zero-cross point of a commercial power supply, a temperature detection means for detecting a temperature of an object to be heated by a heating device, and a communication from the temperature detection means to the heating device. An arithmetic unit for calculating the amount of electric power, and calculating a conduction angle to the heating device from a calculation result by the arithmetic unit, and conducting to the switching means so that the conduction angle is calculated based on the zero-cross point detected by the zero-cross detection means. A phase control means for issuing a command, and the phase control means sets the energized power amount to N when the energized power amount is less than a predetermined power value.
(Integer) times, and a heater control device of a sanitary washing device that issues a conduction command corresponding to N times the amount of energized power once every N half-waves of the AC power supply. Thereby, the error between the required output and the actual output at the time of the low output request can be reduced, so that accurate temperature control can be performed.

According to a second aspect of the present invention, a heating device such as a heater driven by a commercial power supply, switching means such as a triac for controlling the application of an AC voltage of the commercial power supply to the heating device, and a zero-cross point of the commercial power supply are detected. Zero-cross detection means, temperature detection means for detecting the temperature of the object to be heated by the heating device, an arithmetic device for calculating the amount of electric power supplied from the temperature detection device to the heating device, and a heating device based on the calculation result by the arithmetic device A phase control unit that calculates a conduction angle to the switching unit and issues a conduction command to the switching unit so that the conduction angle is calculated based on the zero-cross point detected by the zero-cross detection unit. Heater control device of a sanitary washing device that issues an ON command to the switching means only for a predetermined time when there is an energization request of It was. As a result, it is possible to prevent erroneous firing and erroneous extinction of the switching means, thereby enabling accurate temperature control.

According to a third aspect of the present invention, in the heater control device for a sanitary washing device according to the first aspect, when there is a power supply request to the switching means, an O to the switching means is supplied.
The N command is issued only for a predetermined time. Thereby, the error between the required output and the actual output at the time of the low output request can be reduced, and the occurrence of erroneous ignition and extinction of the switching means can be prevented, so that accurate temperature control can be performed.

According to a fourth aspect, in the phase control means of the first aspect, a storage device for storing a predetermined power value is provided, and the storage device stores the predetermined power value for each heater. Thus, the predetermined power value can be changed for each heater, so that the temperature can be controlled according to the characteristics of each heater.

According to a fifth aspect, in the phase control means according to the second aspect, a storage device for storing a predetermined ON time is provided, and the storage device stores the predetermined ON time for each heater. As a result, a predetermined ON is performed for each heater.
Since the time can be changed, it is possible to control the temperature according to the characteristics of each heater.

According to a sixth aspect of the present invention, a heating device such as a heater driven by a commercial power supply, switching means such as a triac for controlling the supply of an AC voltage of the commercial power supply to the heating device, and a zero-cross point of the commercial power supply are detected. A zero-crossing detecting means, a temperature detecting means for detecting a temperature of an object to be heated by the heating device, a calculating device for calculating an amount of electric power supplied from the temperature detecting means to the heating device, and heating from a calculation result by the calculating device. A phase control unit that calculates a conduction angle to the device and issues a conduction command to the switching unit so that the conduction angle is calculated based on the zero-cross point detected by the zero-cross detection unit. When the power is less than the predetermined power value, the conduction command is not issued at least once for a plurality of half-waves of the AC power supply, but is distributed to the remaining half-waves and the same communication command is issued. And a heater control apparatus of Migihitsuji sanitary washing device. Thereby, the error between the required output and the actual output at the time of the low output request can be reduced, so that accurate temperature control can be performed.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION In order to make the contents of the present invention easier to understand, the present invention will be described in detail with reference to examples.

[0018]

FIG. 1 is a block diagram of a main part of a sanitary washing apparatus according to the present invention. The sanitary washing device 1 includes a temperature setting unit 2, a temperature detection unit 3, a calculation unit 4 that determines a heater output value from a set temperature and a detected temperature, and calculation of a zero-cross detection unit 7 and a calculation unit 4. The phase control means 5 outputs an energization command to the switching means 12, 13, 14, 15 based on the result, and the heaters 8, 9, 10, 11 are controlled independently.

The temperature setting unit 2 includes a temperature setting unit for each heater, and the temperature detection unit 3 includes a unit for detecting a temperature of an object to be heated by each heater.

The control unit 6 is, for example, a microcomputer. The arithmetic unit 4 in the control unit 6 calculates a heater output W value based on information from the temperature setting unit 2 and the temperature detecting unit 3, and further calculates a conduction angle to the heater and a conduction angle to the heater. Calculate the heater ON delay time. Here, the heater ON delay time is a time obtained by calculating the heater energizing time from the conduction angle to the heater and subtracting it from a half cycle of the power supply waveform (for example, 10 ms for 50 Hz).

The phase control means 5 has a timer function, and outputs an ON signal to the switching means 12, 13, 14, 15 when the heater ON delay time elapses after the zero cross point is detected by the zero cross detection means. Is what you do.

Switching means 12, 13, 14, 15
Is a triac, for example, for energizing the heater from the time when the ON signal is received from the phase means 5 to the next zero cross point.

FIGS. 2 and 3 show waveforms of current supplied to the heater according to the present invention. FIG. 2 shows an energization waveform when the heater output W value is high. T1 is the power supply time to the heater, and T2 is the heater O
The N delay time, T3, is the pulse width of the ON signal output from the microcomputer to the triac, and is a value in consideration of a margin in the time when the triac is reliably turned on, for example, 1 ms.

T4 is defined as the width of the area where the triac cannot be fired.
This is a time width that takes into account the delay of software interrupt processing as a margin. Here, it is an absolute condition that V2 is larger than the triac ON voltage.

The heater output W value corresponding to the energizing time of T4 is the lower limit output value by the phase control.
W.

When the required heater output value is 10 W or more,
Even if the delay factor occurs, there is no possibility of erroneous arc extinguishing and erroneous ignition in energizing the heater, so as shown in FIG.
A phase output is performed for each half wave, which is a normal phase control method.

Conversely, if the required heater output value is less than 10 W, there is a possibility that the arc may be erroneously extinguished or ignited due to any of the above-mentioned delay factors, so that the intermittent phase control as shown in FIG. Switch.

FIG. 3 shows an energization waveform when the heater output W value is low, for example, less than 10 W. If the required heater output value is calculated to be less than 10 W, the required heater output value is set to N
(Integer) times and output once every N half-waves. T5
Is a power supply time corresponding to an output W value that is N times the heater required output, for example, eight times, and T6 is a time subtracted from a half cycle of the power supply waveform, that is, a heater ON delay time.

By performing intermittent phase control such as outputting the energization at T5 every eight half-waves, the temporal average value of the heater output is made equal to the required output.

When such a low output is required, an intermittent phase output that outputs N times once every N half-waves is more effective than a phase output for each half-wave because the output error ratio becomes smaller. Means.

As described above, a wide range of heater output is enabled by switching the energization method between normal phase control and intermittent phase control in accordance with the required heater output value.
Prevent erroneous firing or extinction of the triac due to delays in zero-cross detection or software interrupt processing, etc.
In addition, accurate temperature control can be performed.

As a threshold value for switching between the normal phase control and the intermittent phase control, that is, a reference value for a low output request, a value different for each heater is stored in an EEPROM, and which heater needs to be energized is determined. By identifying, it is also possible to change the reference value of the low output request for each heater. Also,
Similarly, it is possible to change a different value for each heater by storing the pulse width of the ON signal output to the switching means in the EEPROM.

[0033]

According to the present invention, the following effects are exhibited by the above configuration. In accordance with the required heater output value, the method of energizing the heater is switched between normal phase control and intermittent phase control, and ON is applied to switching means for applying an AC voltage to the heater.
By setting the pulse width of the signal to a width that can be reliably turned on by the switching means and to a minimum value, erroneous ignition or extinction of the switching means is prevented, and accurate temperature control and a wide range of heater output are achieved. Possible.

[Brief description of the drawings]

FIG. 1 is a block diagram of a main part of a sanitary washing device according to the present invention.

FIG. 2 is an energization waveform when a heater output W value is high according to the present invention.

FIG. 3 is an energization waveform when the heater output W value is low according to the present invention.

FIG. 4 shows an example of erroneous arc extinction in conventional energization control.

FIG. 5 shows an example of an erroneous firing in a conventional energization control.

[Explanation of symbols]

1 ... sanitary washing device, 2 ... temperature setting unit, 3 ... temperature detection unit,
4 arithmetic unit, 5 phase control means, 6 control unit, 7 zero-cross detection means, 8 hot water heater, 9 toilet seat heater,
10: Drying heater, 11: Room warming heater, 12 to 15: Switching means for energizing the heater

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D037 AA02 AD03 AD04 AD05 AD08 AD14 2D038 JB02 JC11 JC15 JF00 JH00 JH01 KA00 KA11 ZA05 3K058 AA41 BA01 BA11 CB05 CB06 CB23 CD01

Claims (6)

[Claims] 1. A heating device such as a heater driven by a commercial power supply, a switching device such as a triac for controlling the application of an AC voltage of the commercial power supply to the heating device, and a zero-cross detection device for detecting a zero-cross point of the commercial power supply. And a temperature detecting means for detecting the temperature of the object to be heated by the heating device, a calculating device for calculating the amount of electric power supplied from the temperature detecting device to the heating device, and a calculation result obtained by the calculating device. A phase control unit that calculates a conduction angle to the heating device and issues a conduction command to the switching unit so that the conduction angle becomes the calculated conduction angle with reference to the zero-cross point detected by the zero-cross detection unit. When the supplied power is less than a predetermined power value, the supplied power is multiplied by N (integer), and the N power of the AC power source is changed once every N half-waves. Heater controller of the sanitary washing device which is characterized in that the conduction command corresponding to the energization power of N times. 2. A heating device such as a heater driven by a commercial power supply, switching means such as a triac for controlling the application of an AC voltage of the commercial power supply to the heating device, and a zero-cross detecting means for detecting a zero-cross point of the commercial power supply. And a temperature detecting means for detecting the temperature of the object to be heated by the heating device, a calculating device for calculating the amount of electric power supplied from the temperature detecting device to the heating device, and a calculation result obtained by the calculating device. A phase control unit that calculates a conduction angle to the heating device and issues a conduction command to the switching unit so that the conduction angle becomes the calculated conduction angle with reference to the zero-cross point detected by the zero-cross detection unit. Is that when there is a request to energize the switching means, an ON command to the switching means is issued only for a predetermined time. Heater controller of the sanitary washing device according to symptoms. 3. The heater control device of the sanitary washing device according to claim 1, wherein an ON command to the switching means is issued only for a predetermined time when there is a power supply request to the switching means. Heater control device for sanitary washing device. 4. The sanitary washing device according to claim 1, wherein the phase control means includes a storage device for storing a predetermined power value, and the storage device stores the predetermined power value for each heater. Heater control device. 5. The sanitary washing device according to claim 2, wherein the phase control means includes a storage device for storing a predetermined power value, and the storage device stores a predetermined ON time for each heater. Heater control device. 6. A heating device such as a heater driven by a commercial power supply, switching means such as a triac for controlling the application of an AC voltage of the commercial power supply to the heating device, and a zero-cross detecting means for detecting a zero-cross point of the commercial power supply. And a temperature detecting means for detecting the temperature of the object to be heated by the heating device, a calculating device for calculating the amount of electric power supplied from the temperature detecting device to the heating device, and a calculation result obtained by the calculating device. A phase control unit that calculates a conduction angle to the heating device and issues a conduction command to the switching unit so that the conduction angle becomes the calculated conduction angle with reference to the zero-cross point detected by the zero-cross detection unit. When the supplied power amount is less than a predetermined power value, the conduction command is not issued at least once for a plurality of half-waves of the AC power supply, and the remaining Heater controller of the sanitary washing device characterized by performing the passing instruction by distributing the wave.