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AssigneeNGK Insulators, Ltd.
InventorsSouzaburou Hotta, Takayuki Sekiya, Takeshi Sakuma
Estimating the term…
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.
A circuit for outputting a succession of positive and negative pulses to energize a discharge lamp, comprising:
A method of energizing a discharging lamp with a discharge lamp energizing circuit having a pulse generating circuit having a DC power supply unit, and a transformer and at least one semiconductor switch which are connected in series across said DC power supply unit, wherein said pulse generating circuit outputs high-voltage pulses to said discharge lamp, and a control circuit for supplying energizing pulses for turning on and off said semiconductor switch, wherein said transformer has a secondary winding with said discharge lamp connected thereacross, said method comprising the steps of:
Dependencies are inferred from the claim text.