JPS6279501A - Heater control device - Google Patents

Abstract

PURPOSE:To decrease the unpleasant feeling accompanying the flicker phenomenon by providing the means to drive the heater based upon the heater control signal from the heater control signal determining means, diffusing in respective control periods and energizing and controlling the heater. CONSTITUTION:A series of the heater control signal is temporarily latched to the bubber register, synchronized for respective half cycles of an alternating current electric power source 8, from the zero point of respective half cycles, namely, from the beginning, to a gate terminal (g) of a triode AC switch 9 of a heater driving means 7, a heater control signal G0 is successively outputted, and returned to a step P1 for the control period. Consequently, the electric current impressed to a heater 4 in a control period T corresponds to the slating line part of (c), and the heater output is obtained like the slating line. Thus, the diffusion is executed in the control period, the heater is energized, the flicker phenomenon does not occur synchronizing with the control period, the period comes to be thinner and the unpleasant feeling of the visibility can be almost eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a heater control device that controls the output of a heater.

(Prior art) In recent years, buttocks-cleaning type private parts washers have been used in toilets in every household. Equipped with a hot air heater to dry the clothes. This hot air heater has a heater consisting of a resistance heating element,
The heater is composed of a fan that blows away the heat generated by this, and the output of the heater is controlled by time proportional control in order to accurately control the target temperature. In this time proportional control, the output of the heater is changed by changing the ratio of the energization time to the heater every preset control cycle, and control is performed for the target temperature. For example, when the control period T is 0.1 seconds and the heater capacity is 350W, as shown in Fig. 6, the ratio of the heater output required in each control period T to the heater capacity is te 1/2,
If 3/4, I/4, I/2...
The energization time to the heater in each control period T is 0
．． 05 seconds, 0.075 seconds, 0.025 seconds.

0.05 seconds... a roar. Furthermore, when driving the heater with an AC power supply, the energization within each control period T is continued from the beginning of each control period T, as indicated by diagonal lines in FIG. 7, so the heater output also increases. As shown in the figure.

(Problems to be Solved by the Invention) However, in the conventional heater control device described in -1.
Heaters are generally connected to the same wiring as indoor lighting, and a medium-load capacity heater of around 350 W is used, so a voltage drop occurs when the heater is driven, for example as shown in Figure 6. As a result, indoor lighting tends to be dim when the heater is running, and bright and flicker when the heater is stopped, which is a so-called flicker phenomenon. This flicker phenomenon occurs in synchronization with each control cycle, as shown by the diagonal lines in Fig. 7, and this flicker phenomenon occurs in synchronization with each control cycle, as shown by the diagonal lines in Figure 7. Depending on the control cycle used, the discomfort associated with the flicker phenomenon may increase.

In other words, as is generally known, the visual sensitivity of the flicker phenomenon, that is, the perception of flickering of illumination, reaches its maximum when the period of the flicker phenomenon is 0.1 seconds. Therefore, when the control period of the time proportional control is set to 0.1 seconds, the user will feel the most flickering due to the flicker phenomenon, and the discomfort will be the greatest. In order to reduce the discomfort caused by such flicker phenomena, a method of controlling the phase to the middle of each half cycle of the power supply frequency included in the control period may be considered, but this phase control causes a lot of noise. , a noise absorbing circuit, etc. is required, which has the disadvantage of complicating the circuit.

(Object 1 of the invention) Therefore, in the present invention, by using a simple configuration, even if the control period is set to 0.1 seconds, which causes the maximum discomfort, the period of the flicker phenomenon can be further reduced, and the period of the flicker phenomenon can be further reduced. It is an object of the present invention to provide a heater control device that can reduce the discomfort associated with.

(Means for solving problems and their effects) FIG. 1 is an overall configuration diagram of the present invention.

When the heater control device of the present invention is powered on, a detection signal Sa is input from the temperature detection means (6). The heater output calculation means calculates the required heater output W based on the target temperature setting value SO preset in the target temperature setting means. In the heater control signal determination means, an on-off pattern previously stored in the heater output pattern storage means is called based on the heater output W obtained by the calculation, and a heater control signal within each control period is determined based on this on-off pattern. The output will be output. -1- In the heater output pattern storage means, an on-off pattern indicating each half cycle of the AC power frequency included in the control cycle is stored corresponding to each heater output value, and this on-off pattern is]- The on/off states of each half cycle are distributed and displayed in advance within the control period.

Therefore, in the heater drive means (7), distributed energization control is performed within the control period based on the heater control signal GO, and the energization period for energizing the heater is finer than each control period.

(Example) An example of the present invention will be described below based on the accompanying drawings. In this embodiment, a case will be described in which the present invention is applied to a heater for a toilet private toilet of a type that is installed in a domestic toilet and is dried with warm air after cleaning.

FIG. 2 shows a toilet private area washer that includes a casing (2) with a controller (+) integrated into the side and a built-in cleaning device and hot air device.

Inside the casing (2) are a fan (3) and a heater (4).
A hot air heater (5) consisting of
Temperature sensors (8) for detecting the temperature of the air discharged from the controller (1) are sequentially arranged facing the front of the toilet seat.
Inside, a fan drive device, a heater drive circuit (heater drive means) for driving the heater (4), and its control device are provided.

1- The heater driving means (7), as shown in FIG.
It consists of an AC power source (8) and a bidirectional three-terminal thyristor (hereinafter referred to as TRIAC) (8) which are connected in series to a heater (4). ”-The AC power supply (8) is, for example, 8
The triac (8) is configured using a commercial frequency power source of 0 Hz, and is therefore turned on at the moment a trigger pulse is applied to the trigger terminal g, and the heater (4) is energized accordingly. At each zero point of the alternating current, it is turned off and the supply of electricity to the heater (4) is stopped. - The heater (4) is constituted by, for example, a resistance heating element that generates a heat amount depending on the magnitude of the flowing current.

As shown in FIG.
) that detects the temperature of the discharged air as an analog electrical signal (6), and this temperature sensor (6).
An A/D converter (lO) that converts the detection signal Sa from the
The microcomputer (11) outputs a heater control signal Go as a trigger pulse to the gate terminal g of the torch driver (8) based on an input signal from the controller. Note that (12) shown in FIG. 3 is a target temperature switching switch that switches from 11 standard temperature 1n of the hot air heater (5) to (1(λ).

The above microcomputer (MPU) (II) is I1
0 board, memory, arithmetic unit and control unit (CPU),
It is composed of a clock generator, a buffer register, a power supply circuit, etc., and operates based on the clock pulses of the clock generator. Then, when the power is turned on, the microcomputer (11) detects the temperature sensor (6).
The detection signal Sa from the sensor is digitally converted by an A/D converter (10) and processed according to a program written in the memory. In the memory, a target temperature setting value So indicating the target temperature is preset and stored in several stages centered around approximately 50°C, and the target temperature is set by the target temperature changeover switch (
12). Also, in memory,
An on/off pattern C whose address is the heater output value W is stored as a table. This pattern C displays the on/off state of each half cycle of the power supply frequency included in the control period T as binary values of O and 1, corresponding to each heater output value W, and also The ON state is displayed dispersedly within the control period T. For example, when the control period T is 0.1 seconds, the frequency of the AC power supply (8) is 60
In the case of Hz, each control period T includes 6 frequencies, and its half cycles are 12, so Fig. 4 (a)
), it is displayed in 12 bits. Also,
The microcomputer (11) is equipped with a buffer register, which temporarily latches the heater control signal read and determined from the memory, and transfers the heater control signal GO to the heater drive means (11) in synchronization with each half cycle of the AC power supply. 7).

Next, the effect will be explained.

FIG. 5 is a flowchart of heater control processing in the microcomputer (11), and PI-P5 in the figure indicates each step.

When the power switch is turned on, the microcomputer (
11) and other circuits, and control is started.

The microcomputer (11) first checks the readability of step P1, warm melon detection step P1, and No. 8 Sa, and proceeds to step P2. In step P2, the calculations 5o-5a are performed on the target temperature set value So and the temperature detection signal Sa, and the currently required output of the heater (4) is determined by these calculations. (+ri W is obtained. In step P3, the contents of the memory whose address is the heater output value W are called and determined as the heater control signal. As described above, in the memory, the contents of the memory included in the control cycle are An on-off pattern that displays each half cycle of the power supply frequency is stored as its content C. This pattern C, for example, has a control period T of 0.1 seconds, a power supply frequency of 60 Hz, and a heater output that varies depending on the heater capacity. 1/of the item
In the case of 2, the display is as shown in Fig. 4(a), and the on-off state jl of each half cycle is distributed within the control period T.
゛The display is displayed. Next, in step P4,
A series of heater control signals are temporarily latched into a buffer register. In step P5, in synchronization with each half cycle 4Ij of the AC power supply (8), from the zero point of each half cycle, that is, from the beginning, the heater drive-1 stage (7) is activated (8
) is sequentially outputted with a heater control signal GO as shown in FIG. 4(b), and returns to step PI for each control cycle. Therefore, the current flowing through the heater (4) within the control period T corresponds to the shaded area in FIG. 4(c), and the heater output as shown by the shaded area in FIG. 4(c) is obtained.

In this way, conventionally, the heater is energized continuously from the beginning of the control cycle as shown in FIG. 7, whereas in this embodiment, the heater is energized continuously from the beginning of the control cycle as shown in FIG. Since the heater is energized in a distributed manner, the flicker phenomenon does not occur in synchronization with the control cycle.
Even if it is only seconds, the cycle of the flicker phenomenon becomes finer, and discomfort in visibility can be almost eliminated.

In this embodiment, the control period has been described as 0.1 seconds at which the flicker phenomenon is maximum, but it can be set arbitrarily. Also, although the explanation was given assuming that the power supply frequency was 80Hz,
Similar effects can be obtained at 50 Hz. Further, although the hot air heater for a toilet bowl has been described as an example, the present invention can be applied to a load that can obtain an output level depending on the amount of electric power input.

(Effects of the Invention) As explained below, according to the present invention, the period of the flicker phenomenon can be made finer than the control period by controlling the energization of the heater in a distributed manner within the control period. This has the advantage that it can almost eliminate the discomfort associated with the flicker phenomenon, and can be achieved with a simple configuration without using phase control or the like.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of the present invention, FIGS. 2 to 5 are diagrams showing a heater control device according to an embodiment of the present invention, FIG. 2 is a perspective view showing a controller and a toilet private washer, and FIG. 3
The figure is a block configuration diagram of the heater control device, FIG. 4(a) is a schematic diagram showing the on/off pattern stored in the memory, FIG. 4(b) is a time chart showing the heater control signal, and FIG. 4(C) is a time chart showing the heater output, Fig. 5 is a flowchart showing the outline of heater control, Figs. 6 and 7 show conventional examples, and Fig. 6 shows the required heater l-H power ratio, energization time, and lighting condition. FIG. 7 is a time chart showing the heater output within the control period. In the drawing, (4) is a heater, (8) is a temperature detection means, and (7) is a heater.
) is a heater drive means, (8) is an AC power supply, Sa is a temperature detection signal, SO is a target temperature set value, GO is a heater control signal, and T is a control period.

Claims (1)

[Claims] A heater control device that controls energization of a heater driven by an AC power source at a predetermined control cycle, comprising: temperature detection means for detecting the temperature of the heater; target temperature setting means for presetting a target temperature of the heater; heater output calculation means for calculating a necessary heater output based on a detection signal from the temperature detection means and a target temperature setting value of the target temperature setting means; and an on/off state for each half cycle of the AC power frequency included in the control period. heater output pattern storage means for storing in advance an on-off pattern that is distributed and displayed in correspondence with each heater output value; A heater control signal determining means for calling an on-off pattern to determine and output a heater control signal, and a heater driving means for driving the heater based on the heater control signal from the heater control signal determining means, A heater control device characterized by controlling electricity supply to a heater in a distributed manner.