JPS6284233U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an example of a load switching device according to this invention, Fig. 2 is a circuit diagram of an input signal circuit in the load switching device according to this invention, and Fig. 3 is a sectional view showing an example of a contact relay and a socket. , FIG. 4 is a circuit diagram showing another example of the load switching device according to this invention, FIG. 5 is a circuit diagram showing an example of the conventional load switching device, and FIG. 6 is a circuit diagram for explaining the operation of FIG. 5. It is a time chart. 1... Input signal circuit, 2... Load circuit, I ₁ , I ₂
...Input terminal, _P1 , _P2 ...Power supply terminal, T...Trigger element (light emitting element), E...Power supply, RL...Load, R
Y...Contact relay, X...Relay coil, Xb...Relay contact for energizing, SK...Socket, _Y1 , _Y4 ...
Socket terminal, Q... semiconductor switching element, 9
e, 9f...external terminal, 11...ON delay circuit,
12...OFF delay circuit, 13...unit circuit, 15...coil terminal.

Claims (1)

[Scope of utility model registration request] An input signal circuit including a relay coil and a trigger element inserted between a pair of input terminals, which are excited by the application of an input signal, and a trigger element between a pair of power supply terminals to which a power supply and a load are connected. In a load switching device equipped with a load circuit in which a semiconductor switching element that conducts in response to a trigger signal from the element and a relay contact for carrying load current are connected in parallel, the relay is activated after a predetermined delay time from the application of an input signal. an ON delay circuit that excites the coil and demagnetizes the relay coil when the input signal ebbs and flows; and an ON delay circuit that energizes the trigger element when the input signal ebbs and flows, and a predetermined delay time from when the input signal ebbs and flows. An OFF delay circuit that later cuts off current to the trigger element is connected to the input signal circuit, and the trigger element, the semiconductor switching element, the ON delay circuit, and the OFF delay circuit constitute a unit circuit; The above-mentioned unit circuit is separated from the contact relay equipped with the above-mentioned relay coil and the relay contact for energizing the load current, and installed inside the socket, and the external terminal of the contact relay is removably inserted into the socket terminal to electrically connect it. A load switching device characterized by being connected.