JPS5813632Y2 - timer device - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a timer device.

A typical timer device is configured as shown in FIG. 1, for example.

That is, as shown in FIG. 1, timer device 1 is connected to timer circuit 2.
5CR4, etc., which are driven by the time-up output of the timer circuit 2 and control the output relay 3.

When AC power is applied between the housing terminals 01 and 02, the timer circuit 2 receives current from a half-wave rectifier circuit including a diode 5 and starts a predetermined timer operation.

When the timer circuit 2 times up, it outputs a time-up signal to the gate of 5CR4, and 5CR4 turns on.

As a result, the output relay 3 operates to receive current from the half-wave rectifier circuit.

Note that the output relay 3 is also configured to operate by supplying a half-wave rectified current.

In other words, the output relay 3 generates a back electromotive force in its own coil during a half cycle when there is no supplied current, and this causes a self-holding current to flow through the diode 6 installed in parallel to maintain operation. be.

By the way, recent timer devices use light emitting diodes (LEDs).
), etc., to display a time-up display, but in this case, it is necessary to provide a new time-up display circuit, which increases costs.

In view of the above, the purpose of this invention is to provide a timer device having a time-up display function at a low cost by realizing a timer device that can display a time-up display without using a time-up display circuit.

An embodiment of this invention will be described below with reference to FIG.

The circuit in Figure 2 differs from Figure 1 only in that an LED 7 for time-up display is inserted in series with the diode 6, and the other circuit configurations are the same as in Figure 1. The same numbers are given to the parts and the explanations are omitted.

Note that the direction of the LED 7 is the same as that of the diode 6.

With the above configuration, when AC power is applied between the terminals 01 and 02, the output relay 3 enters a predetermined timer operating state as in the case of FIG. 1.

Then, the output relay 3 generates a counter electromotive force in the white coil,
A self-holding current flows through the series circuit of the diode 6 button and the LED 7 to maintain operation.

Therefore, the LED γ lights up in response to the current supply to display a time-up display.

Further, since the back electromotive force of the coil of the output relay 3 is generated every cycle of the AC power supply, the self-holding current flowing through the LED 7 repeats presence and absence depending on this cycle.

Therefore, the LED 7 repeatedly blinks according to the cycle of the AC power supply, but this blinking is so fast that it appears to the human eye as continuous lighting, so there is no problem.

As described above, according to this invention, the time-up display function can be achieved by simply inserting the time-up display LED in series with the operation holding diode that is connected in parallel to the output relay of a normal timer device. You can have it.

Therefore, there is no need to provide a special time-up display circuit, and a timer device having a time-up display function can be provided at an extremely low cost.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a timer device without a time-up display function, and FIG. 2 is a circuit diagram showing one embodiment of the present invention.

Claims (1)

[Scope of utility model registration request] A half-wave rectifier circuit, a timer circuit that receives the current supply from the half-wave rectifier circuit and performs a timer operation, and a timer circuit that receives the current supply from the half-wave rectifier circuit by controlling a semiconductor switching element when the timer circuit times out. A timer device consisting of an operating output relay, and a series circuit connected in parallel to the output relay, including an operation holding diode and a time-up display light emitting diode.