JPS62117Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Purpose of invention] (Industrial application field) The present invention relates to a timer.

(Prior Art) Conventionally, as a timer, for example, as shown in FIG. A starts oscillating at a predetermined frequency, the counting unit b counts the number of oscillations, and when this count reaches a predetermined value, it outputs an "H" signal to the output terminal of the timer circuit, turns on the transistor e, and activates the relay. Something that drives f was known.

(Problem that the invention attempts to solve) However, in such a device, the relay f
is driven by turning on and off the power supply d, which is undesirable as it generates a large current and surge voltage when turning on and off, and requires a large capacity on/off switch. There was a problem in that the counting section b was automatically reset each time the switch was turned on, making it impossible to perform an integration operation on pulsed control signals.

The present invention was developed in view of these points, and it is possible to use a switch with a small electric capacity for the switch that operates the timer circuit, and there is no inrush power generated even when the switch is operated. Furthermore, the present invention provides a timer that enables integration control for intermittent control signals.

[Structure of the idea]

(Means for solving the problem) The timer of the present invention is a one-chip device that counts the number of oscillations of the oscillation section in a counting section and outputs an output signal of the timer circuit when this counted value reaches a predetermined value. In a device having a timer circuit, an oscillation stop signal is input to the oscillation stop section input terminal of the timer circuit via a secondary side circuit formed electrically separately from the primary side circuit by turning on and off the primary side circuit. The present invention is characterized in that a switch section is provided, and the on/off of this switch section of the primary side circuit is used as an operation input signal for the above-mentioned timer circuit.

(Function) According to the present invention, when the switch section is turned off, the input terminal becomes ungrounded, the oscillation stop is canceled, and the oscillation section starts oscillating. The number of oscillations of this oscillation section is counted by a counting section, and when a predetermined count value is reached, the counting section outputs an output signal of the timer circuit, and the oscillation of the oscillation section is stopped by an oscillation stop section.

Furthermore, even if a pulse-like signal that turns the switch section on and off intermittently is input, the counter section retains the count value up to that point while the switch section is on, and the switch section When turned off, the counting section starts counting anew in addition to the above-mentioned count value. When the accumulated time during which the switch section is turned off reaches the timer drive time, the counting section outputs the output signal of the timer circuit, and since the timer circuit operates, the accumulation operation can be performed even with a pulse-like operation input signal.

(Example) Next, an example of the present invention will be described based on the drawings.

1 is the commercial power supply terminal, and the DC power supply section (hereinafter referred to as
This is converted into a predetermined DC voltage and outputted in a DC power supply section (2).

3 is a relay, and one end of its coil part is connected to DC
It is connected to the positive electrode side of the power supply section 2, and the other electrode is connected to the collector of an npn type transistor 4 whose emitter is grounded. A photodiode 6 is connected in parallel to the relay 3 via a resistor 5, and a photodiode 8 is also connected in parallel to the npn transistor 4 via a resistor 7.

When the coil portion of the relay 3 is energized, the contacts 3a and 3b are turned on, and when the relay 3 is de-energized, the contacts 3a and 3c are turned on.

Reference numeral 11 denotes a timer circuit formed of a one-chip IC element, which inputs the output voltage of the DC power supply section 2 as a power source through a smoothing circuit 12, and further converts it into a constant voltage in an internal constant voltage section 13 for use. There is. This timer circuit 11 includes the constant voltage section 13,
An oscillation section 14, a counting section 15, a reset section 16, an oscillation stop section 17, etc. are organically connected and formed. This timer circuit 11 includes a constant voltage section 1
When power is input to the input terminal 13a of the counter 3, the counting section 15 is automatically reset and outputs an "L" signal to the output terminal 20. Further, the oscillation frequency of the oscillation section 14a is determined by the variable resistor 18a of the frequency adjustment circuit 18 connected to the external terminal 14a of the timer circuit 11.
This is done by adjusting the The frequency division number of the counting section 15 is set by a switch 19 connected to the external terminal 15a of the timer circuit 11, and the number of oscillations of the oscillation section 14 is counted based on this frequency division number.
When the counted value reaches a predetermined value, the timer circuit 11
It outputs an "H" signal to the output terminal 20 and counts up. When the reset terminal 16a is grounded, the reset section 16 clears the count value of the counting section 15 and sets the signal at the output terminal 20 of the timer circuit 11 to "L". The oscillation stop section 17 stops the oscillation of the oscillation section 14 when the input terminal 17a of the timer circuit 11 is grounded, and stops the oscillation section 14 when the input terminal 17a is not grounded.
4 to perform oscillation.

An output terminal 20 of this timer circuit 11 is input to the base of an npn transistor 4 via a resistor 21.

31 is a switch section, and photodiode 3
2a and a phototransistor 32b. This photodiode 32a forms a primary side circuit which uses the DC power supply section 2 as a power source and emits light when a switch 33 is turned on, turning on a phototransistor 32b. The emitter of the phototransistor 32b is grounded, and the collector is connected to a changeover switch 34 that can freely switch between the reset terminal 16a and the input terminal 17a, forming a secondary circuit for controlling the reset section 16 or the oscillation stop section 17. ing.

Next, the operation of this embodiment will be explained.

First, set the changeover switch 34 to the input terminal 17a side, turn on the DC power supply section 2 with the switch 33 turned on, the timer circuit 11 is automatically reset automatically, and the output signal of the output terminal 20 becomes "L". becomes. Therefore, the npn transistor 4 is turned off, the relay 3 is set in a de-energized state, and the photodiode 8 is lit to display this.

When the switch 33 is turned off as an operation input signal for the timer, the photo coupler 32
is turned off, the input terminal 17a becomes ungrounded, the stoppage of oscillation by the oscillation stopper 17 is released, and the oscillation part 14 starts oscillating. The oscillations of the oscillation unit 14 are counted by the counting unit 15, and when a predetermined count value is reached, the counting unit counts up and inverts the output terminal 20 of the timer circuit 11 to an “H” signal.
The npn transistor 4 is turned on to drive the relay 3, and the oscillation stop section 17 causes the oscillation section 14 to
oscillation is stopped. The time from when this switch 33 is turned off to when the relay 3 is driven is the timer operation time, and this operation time is determined by adjusting the variable resistor 18a of the frequency adjustment circuit 18 to adjust the frequency of the oscillation section 14, or by adjusting the frequency of the oscillation section 14. Alternatively, this can be done by selecting the frequency division number of the counting section 15 using the switch 19.

Furthermore, even if a pulse-like signal that turns the switch 33 on and off intermittently is input as an operation input signal for the timer, when the switch 33 is turned on, the counting section 15 will keep track of the count value up to that point. is held, and when the switch 33 is turned on, the counting section 15 starts counting anew in addition to the above counted value. Therefore, when the accumulated time during which the switch 33 is turned off reaches the timer operation time, the counting section 15 counts up, the output of the timer circuit 11 is inverted, and an "H" signal is output, and the relay 3 is driven.

Note that when the npn transistor 4 is turned on, the photodiode 6 is turned on, indicating that the relay 3 is being driven.

Further, in this embodiment, a photo coupler 32 is used as the switch section 31, but the switch section 31 is not limited to this, and a relay or the like may be used.

(Effects of the invention) According to the invention, in a timer whose timer circuit is a commercially available one-chip element that conventionally used power on/off as an operation signal, the oscillation stop part input terminal of the timer circuit is connected to the timer circuit's oscillation stop part input terminal. By using it as an input terminal for control signals, the signal current becomes weak, and as a result, the electric capacity of the switch section that inputs control signals to the input terminal can be made small, and even when inputting operation signals. Generation of inrush current can be prevented. In addition, since the switch section that inputs the operation input signal of the timer circuit is operated by the primary circuit that is electrically formed with the secondary circuit, even if high voltage is accidentally input to the switch section, the timer circuit will not work. Damage can be prevented. Furthermore, since a method is used in which the oscillation of the oscillation section is controlled as the operation input signal, integration control using a pulse-like operation input signal that is intermittently input is also possible.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram of a conventional timer, and FIG. 2 is an electric circuit diagram showing an embodiment of the timer of the present invention. 11... Timer circuit, 14... Oscillation section, 15
...Counting section, 17...Oscillation stop section, 17a...Input terminal, 31...Switch section.

Claims (1)

[Scope of utility model registration request] A one-chip timer circuit that counts the number of oscillations in the counting section of the oscillation section and outputs an output signal from the timer circuit when the counted value reaches a predetermined value. A switch section is provided for inputting an oscillation stop signal to the oscillation stop section input terminal of the timer circuit through a secondary circuit electrically formed separately from the primary circuit, and this switch section of the primary circuit is turned on/off. A timer characterized in that OFF is used as an operation input signal for the timer circuit.