| 摘要 |
Methods and apparatus for controlling a high intensity discharge lamp and a power supply system for the high intensity discharge lamp are disclosed. The system relates to a method for controlling high intensity discharge lamp comprising supplying a signal of variable frequency and constant filling factor from a switches cascade to a ballast circuit and the lamp, said ballast circuit having at least one condenser and at least one inductance. The method uses the signal of periodically fluctuating frequency and constant filling factor of 50%, supplied from the electronic switches cascade of the half-bridge type, connected with the ballast circuit and the lamp, where the ballast circuit includes at least first condenser, the lamp and includes first inductance and second condenser forming a resonant circuit. A supply system for high intensity discharge lamp is also disclosed. |
| 主权项 |
1. A method for controlling a high intensity discharge lamp, the method comprising:
supplying a signal of periodically fluctuating frequency and constant filling factor of 50% supplied from an electronic switches cascade of a half-bridge type that is connected with a ballast circuit, wherein the ballast circuit includes at least a first condenser, a lamp, a first inductance, and a second condenser forming a resonant circuit, wherein during an ignition mode of the lamp, the supplied signal is an exciting signal that periodically fluctuates between a first frequency Fmin and a second frequency Fmax and ignites the lamp, the second frequency Fmax being higher than the first frequency Fmin and lower than a third frequency Fstat, the third frequency Fstat being lower than a resonant frequency Fres of the resonant circuit, and wherein a voltage having a constant frequency Fstat generated on the second condenser would be sufficient to ignite the lamp. |
