JPS58162127A - Timer device - Google Patents

Abstract

PURPOSE:To easily set the time and also to reduce an error of the timer time, by constituting a timer of an oscillator, counter, ladder resistance circuit, variable resistor and comparator. CONSTITUTION:A desired timer time is set by adjusting a slider 6' of a variable resistance 6, and prescribed voltage is applied to a comparator 5. A pulse is generated at every prescribed time from an oscillator by depressing a timer start switch 1', is counted by a counter 3, and voltage varied stepwise is generated by a ladder resistance circuit 4, and is inputted to the comparator 5. When voltage applied to an inverting input terminal of the comparator 5 increases and becomes higher than voltage applied to a noninverting input terminal, an output of the comparator 5 becomes low potential, and the timer becomes time-up. By raising the accuracy of the oscillator 1, a timer device which scarcely causes an error is obtained easily, and the timer time can be set easily by the variable resistance 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a timer device, and particularly to one in which a set time can be changed using a variable resistor.

In general, timer devices that use the charging and discharging time of a capacitor or that count the number of output signals from an oscillator have been used. In the former case, an arbitrary time can be set using a variable resistor, etc., but the error is large, and the mechanism has to be complicated to reduce the error. In the latter case, although the error is small for a high-precision oscillator, it is necessary to determine the number of signal counts for time setting, so this mechanism inevitably becomes complicated. This system was developed in view of these drawbacks, and was designed to facilitate time setting using a variable resistor and to reduce errors in timer time using an oscillator. The time setting is easy because it consists of a converter whose output voltage changes stepwise according to the input signal from the converter, and a comparator which compares the output voltage of the converter and the divided voltage generated by the variable resistor. Moreover, it is possible to provide a timer device with small errors.

Hereinafter, embodiments of the device of the present invention will be explained based on the drawings.
1) is an oscillation circuit that generates one pulse every hour after the timer start switch (1) is suppressed, and (2) is an oscillation circuit (
1) is a converter that increases the output voltage in a stepwise manner as shown in Fig. 2 each time the pulse signal from 1) is input.
It consists of a 4-bit counter (3) whose output changes every time one pulse is input, and a ladder resistor circuit 14 connected to each terminal of the counter (3). Also, (5) connect the 2 inverting input terminal to the converter (2
), and the non-inverting input terminal is connected to the slider +g+ of the variable resistor (6).

Since the embodiment of the present invention is configured as described above, in order to operate the timer, first the slider (6) of the variable resistor (6) is
After making all adjustments and setting the desired timer time, the comparator (5
) A predetermined voltage generated from a variable resistor (6) is applied to the non-inverting input terminal of the variable resistor (6). Next, the timer start switch (
When 1) is pressed, the oscillation circuit (1) starts oscillating and repeats the generation of one pulse every hour.

Furthermore, this pulse is input to the converter (2) and the comparator (5)
) is increased by a predetermined value every hour as shown in Figure 2. At this time, the voltage applied to the inverting input terminal of the comparator (51) is increased to the non-inverting input terminal Since the applied rolling pressure is lower than the rolling pressure, the output of the comparator (5) is maintained at a high potential.

Thereafter, when the voltage applied to the inverting input terminal of the comparator (5) increases and becomes higher than the voltage applied to the non-inverting input terminal, the output of the comparator (5) becomes a low potential and a time-up occurs.

In addition, in the embodiment, the output of the converter a is increased at predetermined intervals, but it may be configured to decrease at predetermined intervals, and the output of the comparator when the timer is operating may be a low voltage. may be configured.

As described above, the device of the present invention is equipped with a converter for all outputs from the excavator, and the timer function is configured by comparing the stepwise changing output voltage of this converter with the voltage generated from the variable resistor. By increasing the accuracy of the oscillator, it is possible to easily obtain a timer device 1 with extremely small errors. Furthermore, the variable resistor allows the timer time to be easily set, and a timer device with no setting error in the timer time can be obtained, which is extremely effective.

[Brief explanation of the drawing]

FIG. 1a is an electric circuit diagram showing an embodiment of the device of the present invention, and FIG. 2 is a waveform diagram at the inverting input terminal of the comparator. (1)...Oscillator, (2)...Converter, (5)...
・Comparator, (6)...variable resistor. ■ Oto f1 To (2) is US1 metropolitan

Claims (1)

[Claims] 111 Compare an oscillator that generates a signal at predetermined time intervals, a converter whose output voltage changes stepwise in response to the input signal from the oscillator, and the output voltage of the converter and the divided voltage generated by the variable resistor. A timer device consisting of a comparator.