| 摘要 |
A discharge lamp energizing circuit has a pulse generating circuit and a control circuit. The pulse generating circuit has a DC power supply unit, and a transformer, a first semiconductor switch, and a second semiconductor switch which are connected in series across the DC power supply unit. The control circuit has a switching control circuit and a frequency setting circuit. The frequency setting circuit has a voltage-to-frequency converting circuit for converting an input voltage into a frequency signal, a frequency information table recorded in a memory, for example, and storing data representative of changes in the input voltage per unit time, a data reading circuit for successively reading the stored data from the frequency information table, and a voltage control circuit for modulating the input voltage based on the read data.
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