| 摘要 |
PURPOSE: An apparatus for controlling operation of fluorescent lamp is provided to achieve prevention against insufficient initial pre-heating time, noise caused by switching, and damage to devices caused by over-current and over-voltage. CONSTITUTION: An apparatus comprises an initial pre-heating time delay circuit(111) installed at a power supply line, switching enhancement circuits(106,107) for forcibly turning on TR1 and TR2 when the pulse of pulse transformers(T1,T2) is changed from "on" to "off", so as to prevent heat generation and loss caused by the noise current produced between driving transistors(FE1,FET2), a noise reduction circuit(110), over-voltage detection circuits(C2,R8) for preventing erroneous operation of the device caused by over-voltage, an over-voltage protection circuit(102) for comparing the over-voltage and a predetermined voltage, an over-current detection circuit(108) for protecting the device from over-current, an over-current protection circuit(103) for comparing the over-current and a predetermined current, and a pulse signal generating IC(109) which stops operation when an abnormality is detected from the result of comparison performed by the over-voltage protection circuit and the over-current detection circuit.
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