Switching element driving circuit and discharge lamp lighting apparatus
AssigneeKoito Manufacturing Co., Ltd.
InventorsToshiyuki Tsuchiya, Masayasu Ito, Takao Muramatsu
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Abstract
Switching elements S1, S2 connected in series are provided on the secondary side of a pulse transformer T to which an input voltage is supplied from a DC power supply E. On the primary side of the pulse transformer T, switching element S3, S4 are provided, and a regenerating unit RG including a current limiting inductor L1 and a regenerating inductor L2 is connected to the DC power supply E and the primary side of the pulse transformer T. A current is limited by the inductor L1 during an on time of the element S3 or S4, whilst a current is regeneratively supplied to the DC power supply E by using the inductor L2 during the off time of the elements S3, S4.
Claims5
A switching element driving circuit to receive an input voltage from a DC power supply and alternately switch first and second switching elements connected in series on a secondary side of a pulse transformer, wherein, during operation, a signal from a first secondary winding of the pulse transformer is supplied to the first switching element, and a signal from a second secondary winding of the pulse transformer is supplied to the second switching element, the switching element driving circuit comprising:
- third and fourth switching elements on a primary side of the pulse transformer, wherein the third switching element is coupled to one of the primary windings of the pulse transformer, the fourth switching element is coupled to the other of the primary windings of the pulse transformer, and a regenerating unit, which includes a first inductor for limiting a current during an “on” time of the third or fourth switching element and a second inductor for performing a regenerating operation during an “off” time of the third and fourth switching elements, is connected to the DC power supply and the primary side of the pulse transformer.
A discharge lamp lighting apparatus in which a DC-AC converter for receiving a DC input voltage to be converted into an AC voltage includes a pulse transformer and a circuit configuration for alternately switching first and second switching elements connected in series on a secondary side of the pulse transformer,
- wherein, during operation, a signal from a first one of secondary windings of the pulse transformer is supplied to the first switching element, and a signal from another of the secondary windings of the pulse transformer is supplied to the second switching element, and
- wherein third and fourth switching elements are provided on a primary side of the pulse transformer, the third switching element is coupled to one of the primary windings of the pulse transformer, the fourth switching element is coupled to the other of the primary windings of the pulse transformer, and a regenerating unit, which includes a first inductor for limiting a current during an “on” time of the third or fourth switching element and a second inductor for performing a regenerating operation during an “off” time of the third and fourth switching elements, is connected to the DC power supply and the primary side of the pulse transformer.
Dependencies are inferred from the claim text.