| 摘要 |
<p>PURPOSE:To make two fluorescence lamps ON by one inverter by a method wherein two secondary coils are provided to an I or T shape inner core and a leakage magnetic path is composed by surrounding the coils by a four-leg or three-leg outer core. CONSTITUTION:When fluorescence lamps are made OFF and no load is applied to secondary coils 4, 4', most of the magnetic flux passes through path (c) because of magnetic resistance of air gaps. When the coils 4, 4' are short circuited, magnetic resistance of the magnetic path to which the secondary coils are provided becomes very high and the flux passes through a path (a). When appropriate loads are connected to those coils 4, 4', the magnetic path becomes (b), (b'). The primary coil 3 is connected to an inverter IV and the secondary coils 4, 4' are connected to fluorescence lamps F1 F2. Practically, for instance, when F1 is ON and becomes under steady state, the flux passes more through the path (b)' than the path (b) and F2 is ON without F1 being OFF, then the flux passes, being divided equally through paths (b), (b'). Current limit and stabilization can be contrived by air gap length and the thickness of spacing sheet. When the power of two lamps are different from each other, the quantity of the flux which passes through the coils 4, 4' can be controlled by changing the thickness of the legs.</p> |
