| 摘要 |
PURPOSE:To obtain a reset-attached inverter device on a contactless system, by composing a signal generating circuit of a switching element and a series circuit of an impedance element and diode. CONSTITUTION:In the device in which waveform-shaping circuit (b) is connected to commercial power supply (a) and circuit (b) is connected to Schmitt circuit 4 via signal generating circuit (c) and to inverter oscillation circuit (e) via actuation circuit (d), circuit (c) composed of switching element SBS, the parallel circuit of a capacitor and resistance, and the series circuit of a diode is supplied with no current because of SBS while the commercial power supply is put to work, circuit 4 will not operate, and photo diode 5 will not come on because of a reverse bias voltage of transistor Tr7 of circuit (c). When commercial power supply (a) is disconnected, battery 1 makes inverter oscillation to light a load, but when the potential of battery 1 decreases, circuit 4 operates to make Tr7 conduct, so that diode 5 will come on. Next, after the commercial power supply is put to work again, circuit (c) operates to make Tr7 bias reversely and, in consequence, diode 5 is made to go off to return its reset state. |
