Two-wire ballast for fluorescent tube dimming

Details Two-wire ballast for fluorescent tube dimming Two-wire ballast for fluorescent tube dimming

H - Electricity

05

B

315/29, 355/51

H05B 41/392 (2006.01)

Patent

CA 1174770

ABSTRACT OF THE DISCLOSURE A two-wire ballast arrangement for fluorescent lamp dimming is disclosed in which a modified transformer utilizing the natural leakage inductance associated with ballast transformers is used to achieve full-range fluo- rescent tube dimming at substantially constant filament heating voltage. Additional auxiliary secondary windings are disposed in predetermined spaced relationship to the primary winding and the main secondary winding to create a "tapping" effect in the magnetic flux. The mutual leakage inductances of the auxiliary secondaries in relation to the primary and the main secondary is utilized in a manner such that as the voltage is decreased to the primary, the voltage of the auxiliary secondary windings remains substantially constant to hold the filament heating voltage substantially constant. Embodiments are disclosed for use either with conventional 50/60Hz or at high frequency, i.e. above 400Hz.

386969

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