Auxiliary quartz lamp lighting system for electronic high intensity discharge lamp ballasts
View Patent ↗A method and electronic circuit operate a quartz auxiliary lamp lighting lamp and circuit to light a quartz auxiliary lamp at 120 Vac and 50-60 Hz current connected to an electronic HID ballast operating at a frequency of 100 Hz to over 400 kHz and voltages of from 120 Vac, as provided by a multitap transformer and related circuitry.
1. In a high intensity discharge lamp control system having an electronic ballast and alternating current power input, an auxiliary quartz lamp and auxiliary quartz lamp controller system for start-up and turn-off modes of operation of said quartz lamp by solid-state switches comprising gated triacs of said auxiliary quartz lamp controller system in response to presence of no input current and full magnitude of input current to said electronic ballast wherein said auxiliary quartz lamp lighting controller system comprises, in combination:
a) a current transformer comprising primary and secondary coils with the transformer connected in the power common input tap of said electronic HID ballast and to said AC power input, so as to produce a voltage in the secondary coil in proportion to the current drawn by the said electronic HID ballast;
b) a first gated triac connected in series between said auxiliary lighting quartz lamp and said power input and said secondary coil providing voltage according to a current drawn by said electronic HID ballast through said primary coil;
c) a second gated triac coupled between said first gated triac and said current transformer such that said first gated triac is rendered to a non-conductive state only when current is drawn by said high intensity gaseous discharge (HID) lamp and rendered to a conductive state only when no current is drawn by said high intensity gaseous discharge (HID) lamp so as to supply power from said power input to said auxiliary lighting quartz lamp only when no current is drawn by said high density gaseous discharge (HID) lamp; and
d) an auxiliary lamp ballast connected in series to the auxiliary quartz lamp.
2. The auxiliary lighting system as set forth in claim 1 , wherein the second gated triac is coupled to said first gated triac, the gating of said first triac being received through a diac coupled to the second gated triac.
3. The auxiliary lighting system as set forth in claim 1 , wherein the secondary coil of said current transformer is connected as a gating input to the second gated triac.
4. The auxiliary lighting system as set forth in claim 1 , further comprising a phase-shifting capacitor coupled between the output after said first triac and the output of said second triac to maintain said first triac in the conductive state until the second triac conducts.
5. In a high intensity discharge lamp control system having an electronic ballast and alternating current power input, an auxiliary quartz lamp and auxiliary quartz lamp controller system for start-up and turn-off modes of operation of said quartz lamp by solid-state switches comprising gated triacs of said auxiliary quartz lamp controller system in response to the magnitude of input current to said electronic ballast, wherein said auxiliary lighting quartz switch utilizes a current step function and a solid-state switch for an auxiliary lighting quartz lamp to a high density gaseous discharge (HID) lamp on electronic HID ballast, wherein the power source is 120 Vac at 50-60 Hz and the electronic ballast comprises 120 Vac at frequencies of from 100 Hz to over 400 kHz, wherein said auxiliary quartz lamp controller system comprises, in combination:
a) a current transformer having primary and secondary coils with the transformer connected to the power common input tap of said electronic ballast and to said AC power input, so as to produce a voltage in the secondary coil in proportion to the current drawn by said electronic HID ballast;
b) a first solid-state switch having an input and an output and coupled to said secondary coil of said transformer such that a voltage at the secondary coil causes the first switch to electrically close between its input and output, and such that no voltage at the secondary coil causes the first switch to electrically open between its input and output;
c) a second solid-state switch coupled to the first solid-state switch, and having an input and output, such that when the first solid-state switch is closed between its input and output, the second solid-state switch is substantially always open between its input and output, and when the first solid-state switch is open between its input and output, the second solid-state switch is substantially always closed between its input and output; and
d) an auxiliary quartz lamp ballast connected in series to the auxiliary quartz lamp.
6. A solid-state switch as in claim 5 , wherein the first solid-state switch is a triac having a gate element.
7. The solid-state switch as set forth in claim 5 , wherein the second solid-state switch is a second triac having a gate element and being coupled to the first triac with the gate element of the second triac being connected through a diac to the first triac output.
8. The solid-state switch as set forth in claim 5 , wherein the secondary coil of said current transformer is connected to the gate element of the first triac.
9. The solid-state switch as set forth in claim 5 wherein the secondary coil of said current transformer is connected to the gate element of the first triac through a current limiting resistor.
10. The solid-state switch as set forth in claim 5 , further comprising a phase-shifting capacitor coupled between the output of the first traic and the output of the second triac.