JPS60189137U - Ventilation fan switch circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

Fig. 1 is a specific circuit diagram of the present invention, Fig. 2 is a circuit diagram of the main part that is the premise of the above, Fig. 3 is an operation waveform diagram of the above, Fig. 4 is a block diagram of the timer IC shown above, and Fig. 5 is a block diagram of the same as the above. The figure is a timing chart same as the above, and FIG. 6 is a block diagram of a conventional example.

Claims (1)

[Scope of utility model registration request] A switch that turns on and off a fluorescent lighting load connected to an AC power supply, a power supply circuit that turns this switch from an on state to an off state, and then creates a driving power supply, and a certain delay when power is supplied from the power supply circuit. A timer circuit consisting of a timer IC that creates time, a power control circuit consisting of a switching element that drives the ventilation fan load on and off, and a delay time signal during operation of the timer circuit controls the power control circuit to turn on and turn on the ventilation fan load. At the same time, the switching circuit turns off the power control circuit using the time-up signal from the timer circuit to turn off the ventilation fan load, and the noise prevention capacitor built into the fluorescent lighting load is charged when the AC power source is unipolar. and a discharging circuit that discharges the electric charge generated when the alternating current power source has the other polarity so that the alternating current power can be supplied to the power supply circuit when the switch is turned off.