| 摘要 |
<p>A water supply control apparatus includes a flushing device to be supplied with water, a water supply valve for controlling the supply of water to the flushing device, a driving signal generator for selectively generating driving signals of first and second periods, respectively, a sensor responsive to one, at a time, of the driving signals for detecting whether there is a user of the flushing device at one of the first and second periods, to produce a sensor signal selectively including a user-present signal and a user-absent signal of said one period, and a control circuit responsive to the sensor signal for controlling the water supply valve. The control circuit includes a first control section having a switching element responsive to the user-absent signal for issuing a first switching signal to the driving signal generator to generate the driving signal of the first period and responsive to the user-present signal for issuing a second switching signal to the driving signal generator to generate the driving signal of the second period and an output element responsive to the sensor signal for issuing a water supply valve control signal, a second control section responsive to the water supply valve control signal for controlling the water supply valve, and a battery as a power supply for operating the water supply valve, the driving signal generator, the sensor, the first and second control sections. The second period is shorter than the first period.</p> |
