Pulse circuit for gaseous discharge lamps

A load operating circuit comprising, in combination, a direct current power source, load connecting means, a first inductor, unidirectional controlled switch means and a capacitor connected in series with each other across said power source, a second inductor of higher inductance than said first inductor connected across said capacitor and forming a discharge loop therewith, and control means connected to said unidirectional controlled switch means for intermittently turning on the same at predetermined intervals, the ratio of inductance of said second inductor to the inductance of said first inductor being at least about 4:1 to provide for commutation of said unidirectional controlled switch means, whereby pulses may be applied to a load connected to said load connecting means for operation thereof.

A lamp operating circuit comprising, in combination, a direct current power source, a first inductor, unidirectional controlled switch means and a capacitor connected in series with each other across said power source, a second inductor of higher inductance than said first inductor connected across said capacitor and forming a discharge loop therewith, a gaseous discharge lamp connected across said power source in series with said first inductor and said unidirectional controlled switch means, and control means connected to said unidirectional controlled switch means for intermittently turning on the same at predetermined intervals, the ratio of inductance of said second inductor to the inductance of said first inductor being at least about 4:1 to provide for commutation of said unidirectional controlled switch means, whereby pulses are applied to said gaseous discharge lamp for operation thereof.

A lamp operating circuit comprising, in combination, a direct current power source, a gaseous discharge lamp, a first inductor, unidirectional controlled switch means and a capacitor connected in series with each other across said power source, a second inductor of higher inductance than said first inductor connected across said capacitor and forming a discharge loop therewith, and control means connected to said unidirectional controlled switch means for intermittently turning on the same at predetermined intervals, the ratio of inductance of said second inductor to the inductance of said first inductor being at least about 4:1 to provide for commutation of said unidirectional controlled switch means, whereby pulses are applied to said gaseous discharge lamp for operation thereof.

A load operating circuit comprising, in combination, input terminals for connection to a source of electrical current, a first inductor, unidirectional controlled switch means and a capacitor connected in series with each other across said input terminals, a second inductor of higher inductance than said first inductor connected across said capacitor and forming a discharge loop therewith, means for connecting a load across said input terminals in series with said first inductor and said controlled switch means, and control means connected to said controlled switch means for intermittently turning on the same at predetermined intervals, the ratio of inductance of said second inductor to the inductance of said first inductor being at least about 4:1 to provide for commutation of said unidirectional controlled switch means, whereby pulses may be applied to the load for operation thereof.