KR910002296B1 - Timer controller - Google Patents

Abstract

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Description

Timer control

1 is a block diagram of a timer control apparatus according to an embodiment of the present invention.

2 is a flowchart for explaining the operation of this embodiment.

3 is a block diagram of an embodiment of the control circuit using the present invention in a timer for a petroleum combustion heater.

4A is a block diagram illustrating a conventional timer device.

4B is a flowchart for explaining the operation of the apparatus.

5A is a voltage waveform diagram when noise is superimposed on an AC power output.

5B is a full wave rectification waveform diagram of the AC power output.

5C is an interruption signal waveform diagram generated by spherically shaping the full-wave rectification output.

5d is a normal interrupt signal waveform.

* Description of the main parts of the drawings

1: interrupt signal la: microcomputer

2: intervention interrupt control means 3: one hour number means

4: memory means

The present invention relates to a timer control device for generating an interruption stop signal from an AC power supply output, counting the interruption stop signal with a microcomputer to produce a timer output.

FIG. 4A is an example of a microcomputer application timer circuit technology described in, for example, the "Mitsubishi One-Chip 4-Bit PROM Microcomputer User Manual MELPS 4 P185" issued by Mitsubishi Electric Co., Ltd., a semiconductor company on September 1, 1982. In FIG. 4A, a circuit is described in which a high frequency power output of 60 Hz is connected to the interruption interrupt terminal INT of a microcomputer (hereinafter referred to as a microcomputer) to make a reference timer of 100 m seconds. In the above circuit, when the full-wave rectification output of the AC power supply 60 Hz is set as the interruption interruption signal 1, 120 interruption interruption signals are input to the microcomputer for 1 second. 100 seconds = 100 m seconds can be measured. The interruption interruption timing is performed when the ground of the AC waveform reaches the voltage level V _IH as shown in FIG. 4A.

Next, the timer operation of the microcomputer will be described based on the flowchart shown in FIG. 4B. When the interrupt signal 1 is received by the microcomputer 1a via the interrupt terminal INT, the program of the microcomputer la moves to the INT-ENTRY (S-2) of the interrupt processing and automatically interrupts the interruption. It is prohibited. Thus, the contents of the registers storing the results of the processing performed so far are returned to the memory (S-3). Next, each time one interrupt signal is inputted, one preset value of the decimator counter is subtracted (S-4). In this way, the subtraction is continued, and when the hexadecimal counter becomes zero, 12 is preset to the l binary counter in preparation for the counter operation (S-5). Therefore, the flag showing the measurement of 100 m seconds is set to 1 (S-6).

Thereafter, the contents of the registers returned to the memory are returned to the registers again (S-7), and the prohibition of interruption is canceled (S-8). Thus, the program is finally returned to the address before the interruption processing was performed (S-9).

As described above, a relatively accurate timer can be realized by using a commercial power supply frequency.

Since the conventional timer device is configured as described above, for example, noise is generated in the vicinity of the zero crossing of the sinusoidal AC output as shown in FIG. 5A, and the AC output is subjected to full-wave rectification (FIG. 5B). Then, when the interruption signal is generated by square wave shaping (Fig. 5C) with a transistor or the like, the interruption signal due to other noise components of the regular intervention proof signal is superimposed, resulting in more intervention than normal (Fig. 5B). There was a problem that the stop signal was received by the microcomputer and an error occurred in the timer output.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a timer control device that produces a normal timer output even when noise is superimposed on an AC power supply and an interruption interruption signal occurs more than normal.

In the timer device according to the present invention, after the interruption control means of the built-in microcomputer receives the interruption interruption signal, the interruption interruption is prevented until the next interruption input signal is input, and the interruption interruption signal for each interruption permission is given. Is input to the hourly clock means to output the timer, and the interruption signal generated when the interruption is prohibited is stored in the memory means to clear the contents of the memory means with the completion of the one-hour clock operation.

According to the timer control apparatus according to the present invention, since the intervention proof signal is a power source frequency signal and most of the interruption interruption signal generation cycles have been found, the interruption interruption control means normally intervenes the interruption interruption signals generated in the cycles. The stop signal is input to the clockwise means and provided to the timer operation. In addition, the interruption interruption signal generated during an extremely short period, i.e., the interruption interruption period, is held in the storage means as an interruption interruption signal by the noise component, and the contents of the storage means are cleared with the completion of the timer operation to interrupt the interruption by noise. Remove the signal.

1 is a preliminary block diagram of an embodiment of a timer control device according to the present invention. As shown in FIG. 1, this embodiment inputs each cycle signal of the AC power output in the microcomputer la together with the interruption signal 1, and after the interruption signal is input, the interruption signal of the next cycle. An interruption interruption control means (2) for making the interruption interruption period until the input, an anticlockwise means (3) for outputting the count value as a timer output after setting the number of times of the interruption interruption signal set in advance; A storage means 4 is provided for storing the interruption signal generated during the interruption interruption period and at the same time clearing the stored contents on the basis of the signal 5 of the one time clock means 3.

Next, an embodiment of the present invention will be described based on the flowchart shown in FIG. A reference frequency of l00 m seconds is made by connecting a power supply frequency, that is, a full-wave rectification of 60 Hz, to the interrupt interrupt terminal INF of the microcomputer la. Since the interruption signal 1 is generated 120 times per second at 60 Hz, 100 m seconds can be measured every time 12 interruptions are counted. When the interrupt signal 1 is received, the program of MyCom moves to INF ENTER (S-2) of the interrupt process and automatically stops the interrupt. Thus, the contents of the register that stores the result of the processing performed are stored in the memory (S-3). Next, 1 is subtracted from the preset value of the decimal counter (S-4). When the hexadecimal counter becomes zero, the 12-scene counter roll is set to 12 (S-5), and the flag showing the work measured in 100 m seconds is set to 1 (S-6). Next, after the interruption is accepted, the interruption signal generated is cleared by noise (S-10).

Next, the contents of the registers stored in the memory are returned to the register (S-7), and the prohibition of interruption is released (S-8). Finally, the program is returned to the address before the interruption processing (S-9). In this way, the influence of the interrupt signal due to noise can be eliminated.

If the interrupt signal caused by noise occurs immediately before the normal interrupt signal, the interrupt signal due to noise is applied and counted. Same as when I did not receive. Normal interruption signals are typically set such that the AC power output is generated at a voltage close to zero volts. Therefore, the generation of the interrupt signal due to noise has a small time difference from the normal interrupt signal. In this embodiment, although the time for interrupting interruption is short, a sufficient effect is expected to be about 1 m second. Also, if the interruption prohibition time is about 5m seconds, it is more effective.

3 is a circuit block diagram when the timer applying device according to the present embodiment is applied to a control circuit of a petroleum combustion heater.

Oil-fired heaters generally have a Ohyo timer (trade name) with a clock function, it is necessary to count a long time, and an uncomfortable state in which the clock progresses may occur due to the noise of commercial power. In addition, accurate timers are required for controlling the amount of combustion. If the timer is inaccurate in the amount of fuel control, there is a problem that the balance between the amount of lead and the air is broken, resulting in incomplete combustion or an excessive or excessive amount of combustion.

By using the present invention therein, a highly accurate clock function and a complete petroleum combustion heater are realized.

According to the present invention as described above, in addition to the timer device that generates the interruption signal of the microcomputer based on the AC power output, counts the interruption signal to the microcomputer, and sets the count output value to the timer output. Since the interruption signal and the normal interruption signal due to the noise component superimposed on the output can be discriminated, a timer control device is provided which obtains a timer output value high enough to exclude the error timer output due to the noise component. .

Claims (1)

The microcomputer (la) with built-in one-hour clock means (3) for inputting each periodic signal of the AC power output as the interruption stop signal (1) and counting the interruption stop signal (1) for a predetermined time and then outputting it as a timer output. In the timer device having a), an interruption interruption signal is set for the microcomputer (la) by setting the prohibition period for a predetermined time shorter than the time from the reception of the interruption interruption signal to the next cycle interruption interruption input. the interruption stop means (2) for outputting (l) to the stopwatch means (3), and the stopwatch signal (l) generated during the interruption prohibition period; And a storage means (4) for clearing the stored contents on the basis of 5).

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