Control circuits for auxiliary light source for use with high intensity discharge lamps
阅读：769发布：2021-10-17
专利汇可以提供Control circuits for auxiliary light source for use with high intensity discharge lamps专利检索，专利查询，专利分析的服务。并且The present invention relates to control circuits for auxiliary lamps which provide supplemental lighting during the start-up and cool-down phases of operation of associated high intensity discharge lamps. In a first embodiment, a control circuit is disclosed which utilizes only a single reed switch for controlling the auxiliary lamp during both the start-up phase and the cool-down phase of the high intensity discharge lamp. In several other embodiments, inductors are used which are responsive to selected currents and/or voltages to control the operation of the auxiliary lamp. In these other embodiments, a failsafe control is provided which turns off the auxiliary lamp in the event that the principal control circuit fails to do so when the high intensity discharge lamp is in a normal operating phase.，下面是Control circuits for auxiliary light source for use with high intensity discharge lamps专利的具体信息内容。
1. A control system for an auxiliary lamp for providing supplemental lighting for a high intensity discharge lamp, said discharge lamp being connectable to a source of electric power to establish a voltage thereacross and having a normal mode of operation in which the luminescence of said high intensity discharge lamp is at a high level and the voltage thereacross is at an intermediate level and start-up and cool-down modes of operation in which the luminescence of said high intensity discharge lamp is at a reduced level relative to said high level of luminescence and the voltage thereacross is at low and high levels, respectively, comprising: controlled conduction means having a control terminal for receiving a control signal for connecting said auxiliary lamp to an electric power source for said auxiliary lamp to light said auxiliary lamp; and single control means connected to receive the voltage across said high intensity discharge lamp so as to be responsive to said start-up and said cool-down modes of operation of said high intensity discharge lamp for providing said control signal to said control terminal of said controlled conduction means to light said auxiliary lamp during at least portions of said start-up and said cool-down modes of operation of said high intensity discharge lamp whereby said auxiliary lamp provides supplemental lightening when the level of said luminescence of said high intensity discharge lamp is reduced, said single control means including switch means connected to said control terminal of said controlled conduction means which provides said control signal when closed and terminates said control signal when opened, and means for operating said switch including a first source of magnetic flux which has a flux magnitude which is effective to close said switch means during said start-up mode of operation, and a second source of magnetic flux which receives the voltage across said high intensity discharge lamp to provide a magnetic flux which is in opposition to said magnetic flux of said first source and which has a low flux magnitude which is ineffective to overcome said switch closing flux magnitude of said first source in response to said low voltage level across said high intensity discharge lamp representative of said start-up mode of operation of said high intensity discharge lamp so that said switch remains closed, which has an intermediate flux magnitude which is effective to overcome said switch closing flux magnitude of said first source to open said switch means in response to said intermediate voltage level across said high intensity discharge lamp representative of said normal mode of operation of said high intensity discharge lamp, and which has a high flux magnitude which is effective to close said switch means in response to said high voltage across said high intensity discharge lamp representative of said cool-down mode of operation of said high intensity discharge lamp.
2. A control system according to claim 1 wherein said first source of magnetic flux is a permanent magnet.
3. A control system for an auxiliary lamp for providing supplemental lighting for a high intensity discharge lamp, said high intensity discharge lamp being connectable to a source of supply voltage and having a normal mode of operation in which the luminescence of said high intensity discharge lamp is at a high level and start-up and cool-down modes of operation in which the luminescence of said high intensity discharge lamp is at a reduced level relative to said high level of luminescence comprising: controlled conduction means having a control terminal for receiving a control signal for connecting said auxiliary lamp to an electric power source for said auxiliary lamp to light said auxiliary lamp control means including a pair of mutually coupled coils, one of said pair of coils being connected to receive the voltage across said high intensity discharge lamp and the other of said pair of coils being connected to receive said supply voltage, so as to respond to said start-up and said cool-down modes of operation of said lamp, a selected one of said one and said other coils being further connected to said control terminal of said controlled conduction means for providing said control signal to light said auxiliary lamp, the impedance of said one coil being different during at least portions of said start-up and said cool-down modes of operation of said high intensity discharge lamp than during at least a portion of said normal mode of operation so that said selected one coil provides said control signal to said control terminal to said controlled conduction means during said portions of said start-up and cool-down modes of operation of said high intensity discharge lamp whereby said auxiliary lamp provides supplemental lighting when the level of said luminescence of said high intensity discharge lamp is reduced.
4. A control sysem according to claim 3 further including a capacitor connected to at least one of said pair of coils for providing said control signal.
5. A control system according to claim 4 further including a second capacitor connected in series with said first mentioned capacitor for providing a voltage divider, said voltage divider providing said control signal intermediate said first mentioned capacitor and said second capacitor.
6. A control system according to claim 3 further including means for limiting the amplitude of said control signal when the voltage across said high intensity discharge lamp exceeds a predetermined voltage.
7. A control system according to claim 6 wherein said limiting means is a clamping circuit which includes a voltage breakdown device for limiting the amplitude of said control signal.
8. A control system according to claim 7 further including a capacitor connected in parallel with said clamping circuit so that said capacitor is shunted by said clamping circuit when said control signal attains a predetermined amplitude.
9. A control system according to claim 3 further including phase-shifting means for connecting one of said coils to receive the respective one of said voltage across said high intensity discharge lamp and said supply voltage.
10. A control system according to claim 9 wherein said phase-shifting means shifts the phase of said respective one of said voltage across said high intensity discharge lamp and said supply voltage so that said voltage across said one coil is out-of-phase with said voltage across said other coil during said start-up and said cool-down mode of operation of said high intensity discharge lamp so that the impedance of said selected one coil is high, and so that said voltage across said one coil is in phase with said voltage across said other coil during said normal mode of operation of said high intensity discharge lamp so that said impedance of said selected one coil is low, said selected one coil providing said control signal to said control terminal of said first controlled conduction means when said impedance of said selected one coil is high.
11. A control system according to claim 10 wherein said phase-shifting means is connected to provide said supply voltage to said one coil.
12. A control system for an auxiliary lamp for providing supplemental lighting for a high intensity discharge lamp, said high intensity discharge lamp being connectable to a source of electric power to establish a voltage thereacross and having a normal mode of operation in which the luminescence of said high intensity discharge lamp is at a high level and start-up and cool-down modes of operation in which the luminescence of said high intensity discharge lamp is At a reduced level relative to said high level of luminescence comprising: controlled conduction means for receiving an alternating waveform and which is connected to said auxiliary lamp for supplying at least a portion of said alternating waveform to said auxiliary lamp to light said auxiliary lamp in response to a control signal; and control means for connection to said high intensity discharge lamp to be responsive to said start-up and said cool-down modes of operation of said high intensity discharge lamp for providing said control signal to said controlled conduction means to light said auxiliary lamp during at least portions of said one of said start-up and said cool-down modes of operation of said high intensity discharge lamp whereby said auxiliary lamp provides supplemental lighting when the level of said luminescence of said high intensity discharge lamp is reduced during said one of said start-up and said cool-down modes of operation of said high intensity discharge lamp, said control means providing said control signal for varying portions of the whole of said alternating waveform so that said auxiliary lamp receives corresponding varying portions of the whole of said alternating waveform; and failsafe means responsive to the magnitude of the portion of said alternating waveform provided to said auxiliary lamp to prevent sustained operation of said auxiliary lamp with said auxiliary lamp receiving the whole of said alternating waveform.
13. A control system according to claim 12 wherein said failsafe means is at least a part responsive to the IR voltage drop across said auxiliary lamp.
14. A control system according to claim 12 wherein said failsafe means includes a coil which is connected to said auxiliary lamp to receive the IR voltage drop across said auxiliary lamp.
15. A control system according to claim 12 wherein said failsafe means includes a coil connected to said auxiliary lamp for receiving the voltage drop thereacross having a core which approaches saturation when said auxiliary lamp receives increasing portions of said alternating waveform approaching the full alternating waveform so that there is an increasing rate of change in the impedance of said coil when said auxiliary lamp approaches continuous operation.
16. A control system according to claim 12 wherein said failsafe means includes a coil connected to said auxiliary lamp for receiving at least a portion of the voltage drop across said lamp to establish a current through said coil and which has a core which approaches saturation when said lamp receives nearly the entirety of said alternating waveform so that the impedance of said coil decreases at an increasing rate when said auxiliary lamp receives nearly the entirety of said alternating waveform and hence said current through said coil and the temperature rise of said coil consequent said currennt increases at an increasing rate as said auxiliary lamp receives nearly the entirety of said alternating waveform, said failsafe means further including a temperature responsive switch means in heat transfer relationship with said coil which is openable upon a predetermined temperature at said temperature responsive switch means, said temperature responsive switch means connecting said auxiliary lamp to alternating waveform so that said auxiliary lamp is turned off when said temperature responsive switch means opens, said predetermined temmperature at which said temperature responsive switch means opens being related to a predetermined temperature of said coil which is indicative of said core approaching saturation as said auxiliary lamp receives nearly the entirety of said alternating waveform so that said auxiliary lamp is turned off to prevent continuous opeation thereof.
17. A control system according to claim 16 wherein said control means provides nearly the entirety of said alternating waveform to said auxiliary lamp when said high intensity discharge lamp is in said start-up and cool-down modes of operation.
18. A control system for an auxiliary lamp for providing supplemental lighting for a high intensity discharge lamp, said high intensity discharge lamp being connectable with a source of supply voltage to establish an alternating voltage waveform thereacross and having a normal mode of operation in which the luminescence of said high intensity discharge lamp is at a high level and start-up and cool-down modes of operation in which the luminescence of said high intensity discharge lamp is at a reduced level relative to said high level of luminescence comprising: controlled conduction means having a control terminal for receiving a control signal for connecting said auxiliary lamp to an electric power source for said auxiliary lamp to light said auxiliary lamp; and control means receiving the voltage across said high intensity discharge lamp and a voltage waveform from said supply voltage and being responsive to the relative phase of the voltage waveform across said high intensity discharge lamp and the voltage waveform from said supply voltage for providing said control signal to said control terminal of said controlled conduction means to light said auxiliary lamp during at least portions of at least one of said start-up and said cool-down modes of operation of said high intensity discharge lamp whereby said auxiliary lamp provides supplemental lighting when the level of luminescence of said high intensity discharge lamp is reduced during said one of said start-up and said cool-down modes of operation of said high intensity discharge lamp.
19. A control system according to claim 18 further including voltage threshold breakdown means which is conductive at a predetermined voltage level for limiting the amplitude of said control signal when the voltage across said high intensity discharge lamp exceeds said predetermined voltage.
20. A control system according to claim 19 wherein said limiting means is a clamping circuit which includes a voltage breakdown device for limiting the amplitude of said control signal.
21. A control system according to claim 20 further including a capacitor connected in parallel with said clamping circuit so that said capacitor is shunted by said clamping circuit when said control signal attains a predetermined amplitude.
22. A control system according to claim 18 further including phase shift means for shifting the phase of one of said supply voltage waveform received by said control means or said voltage waveform across said high intensity discharge lamp so that said supply voltage waveform and said voltage waveform across said high intensity discharge lamp assumes a predetermined relationship during said normal mode of operation of said high intensity discharge lamp and wherein said control means provides said control signal for lighting said auxiliary lamp when said predetermined relationship does not exist.
23. A control system according to claim 18 wherein said control means is additionally responsive to the relative amplitude of the voltage waveform across said high intensity discharge lamp and the voltage waveform from said supply voltage.
24. A control system according to claim 18 wherein said control means is additionally responsive to the relative shape of the voltage waveform across said high intensity discharge lamp and the voltage waveform from said supply voltage.
25. A control system according to claim 18 wherein said control means is additionally responsive to the relative amplitude and shape of the voltage waveform across said high intensity discharge lamp and the voltage waveform from said supply voltage.
26. A control system according to claim 18 wherein said control means includes a pair of mutually coupled coils with one of said coils receiving at least a portion of said voltage waveform across said high intensity discharge lamp and the other of said coils receiving at least a portion of the voltage waveform from said supply voltage.
27. A control system according to clAim 26 wherein one of said coils provides said control signal to said control terminal of said controlled conduction means.
28. A control system according to claim 27 wherein the impedance through said one of said coils is high for one relative phase relationship of the voltage waveform across said high intensity discharge lamp and the voltage waveform from said supply voltage and is low for another phase relationship of the voltage waveform across said high intensity discharge lamp and the voltage waveform from said supply voltage.
29. A control system according to claim 28 wherein said voltage waveform across said high intensity discharge lamp is out of phase with said voltage waveform from said supply voltage during said start-up mode and said cool-down mode of operation of said high intensity discharge lamp so that the impedance of said one coil is high, and said voltage waveform across said high intensity discharge lamp is in phase with said voltage waveform from said supply voltage during said normal mode of operation of said high intensity discharge lamp so that said impedance of said one coil is low, said one coil being connected to said control terminal of said controlled conduction device so as to turn on said controlled conduction device when said impedance of said one soil is high.
30. A control system according to claim 29 including phase-shifting means connected to receive one of the voltage waveforms of said high intensity discharge lamp and said voltage waveform from said supply voltate to provide said in-phase and out-of-phase relationships.
31. A control system according to claim 29 including phase-shifting means connected to receive said supply voltage to provide said voltage waveform from said supply voltage.
32. A control system for an auxiliary lamp for providing supplemental lighting for a high intensity discharge lamp which is adapted to be powered by a source of supply voltage through a ballast, said ballast having first, second and third terminals with said first and third terminals being adapted to be connected to said source of supply and said second and third terminals being adapted to be connected to said high intensity discharge lamp, said high intensity discharge lamp having a normal mode of operation in which the luminescence of said high intensity discharge lamp is at a high level and start-up and cool-down modes of operation in which the luminescence of said high intensity discharge lamp is at a reduced level relative to said high level of luminescence comprising: controlled conduction means having a control terminal for receiving a control signal for connecting said auxiliary lamp to an electric power source for said auxiliary lamp to light said auxiliary lamp; and control means responsive to the voltage between said first and second terminals of said ballast for providing said control signal to said control terminal of said controlled conduction means to light said auxiliary lamp during at least portions of one of said start-up and said cool-down modes of operation of said high intensity discharge lamp whereby said auxiliary lamp provides supplemental lighting when the level of said luminescence of said high intensity discharge lamp is reduced during said one of said start-up and cool-down modes of operation of said high intensity discharge lamp.
33. A control system according to claim 32 wherein said control means includes a coil which received said voltage between said first and second terminals of said ballast and which is responsive thereto.
34. A control system for an auxiliary lamp for providing supplemental lighting for a high intensity discharge lamp having a normal mode of operation in which the luminescence of said high intensity discharge lamp is at a high level and start-up and cool-down modes of operation in which the luminescence of said high intensity discharge lamp is at a reduced level relative to said high level of luminescence comprising: control means for connecting said auxilIary lamp to a source of electric power for lighting said auxiliary lamp during at least portions of said start-up and said cool-down modes of operation of said high intensity discharge lamp and to provide an IR voltage drop across said auxiliary lamp, said first control means ordinarily disconnecting said auxiliary lamp from said source of electric power during said normal mode of operation of said high intensity discharge lamp; and failsafe means in addition to said control means which is connected to said auxiliary lamp and is at least in part responsive to the IR voltage drop across said auxiliary lamp for limiting simultaneous operation of said high intensity discharge lamp and said auxiliary lamp while under the control of said control means.
35. A control system according to claim 34 wherein said failsafe means is at least in part responsive to the current through said high intensity discharge lamp.
36. A control system according to claim 34 wherein said failsafe means includes a coil which is responsive to the IR voltage drop across said auxiliary lamp.
37. A control system according to claim 36 wherein said coil has a core which is saturable in response to an IR voltage drop across said high intensity discharge lamp when said high intensity discharge lamp is on continuously.
38. A control system according to claim 34 wherein said high intensity discharge lamp is adapted to be powered by a source of supply voltage through a ballast, said ballast having first, second and third terminals with said first and third terminals being adapted to be connected to said source of supply and said second and third terminals being adapted to be connected to said high intensity discharge lamp, said failsafe means being at least in part responsive to the voltage between said first and second terminals of said ballast for limiting simultaneous operation of said high intensity discharge lamp and said auxiliary lamp under control of said control means.
39. A control system according to claim 36 wherein said failsafe means includes a temperature responsive switch which is openable upon a predetermined simultaneous operation of said high intensity discharge lamp and said auxiliary lamp to turn off said auxiliary lamp.
40. A control system according to claim 39 wherein said failsafe means includes heating means which is responsive to the current through said auxiliary lamp for heating said temperature responsive switch when said auxiliary lamp is on.
41. A control system according to claim 40 wherein said heating means receives a current derived from at least a portion of the IR voltage drop across said auxiliary lamp.
42. A control system according to claim 40 wherein said heating means is a resistor.
43. A control system according to claim 40 wherein said heating means is a coil.
44. A control system according to claim 43 wherein said supply voltage has an alternating waveform and said auxiliary lamp continuously receives the entirety of said alternating waveform at times and receives portions of said alternating waveform at other times, and wherein said failsafe means includes a coil having a core which is saturated when said auxiliary lamp receives the entirety of said alternating waveform.
45. A control system for an auxiliary lamp for providing supplemental lighting for a high intensity discharge lamp, said discharge lamp being connectable to a source of electric power to establish a voltage thereacross and having a normal mode of operation in which the luminescence of said high intensity discharge lamp is at a high level and start-up and cool-down modes of operation in which the luminescence of said high intensity discharge lamp is at a reduced level relative to said high level of luminescence comprising: controlled conduction means having a control terminal for receiving a control signal for connecting said auxiliary lamp to an electric power source for said auxiliary lamp to light said auxiliary lamp; and control meaNs for connection to said high intensity discharge lamp to be responsive to said start-up and cool-down modes of opeation of said high intensity discharge lamp and further being connected to receive the voltage across said auxiliary lamp to be in part responsive to the voltage across said auxiliary lamp for providing said control signal to said control terminal of said controlled conduction means to light said auxiliary lamp during at least portions of said start-up and said cool-down modes of operation of said high intensity discharge lamp whereby said auxiliary lamp provided supplemental lighting when the level of said luminescence of said high intensity discharge lamp is reduced.
46. The control system according to claim 45 wherein said control means increases said control signal in response to a voltage across said auxiliary lamp indicating that said auxiliary lamp is lit.
47. A control system according to claim 45 wherein said voltage across said auxiliary lamp tends to maintain the provision of said control signal to said control terminal of said controlled conduction means when said auxiliary lamp is connected to said source of electric power.
48. A control system for an auxiliary lamp for providing supplemental lighting for a high intensity discharge lamp, said discharge lamp being connectable to a source of electric power to establish a voltage thereacross and having a normal mode of operation in which the luminescence of said high intensity discharge lamp is at a high level and start-up and cool-down modes of operation in which the luminescence of said high intensity discharge lamp is at a reduced level relative to said high level of luminescence comprising: first controlled conduction means associated with said auxiliary lamp and a source of power for said auxiliary lamp for controlling the lighting of said auxiliary lamp, said first controlled conduction means including a control terminal for causing said first controlled conduction means to conduct to connect said source of power to said auxiliary lamp to light said auxiliary lamp in response to a first control signal at said control terminal; second controlled conduction means connected to said control terminal of said first controlled conduction means, said second controlled conduction means having a control terminal and supplying said first control signal to said control terminal of said first controlled conduction means in response to a second control signal at said control terminal of said second controlled conduction means; and control means connected to said high intensity discharge lamp to be responsive to said start-up and said cool-down modes of operation of said high intensity discharge lamp for providing said second control signal to said control terminal of said second controlled conduction means so that said second controlled conduction means supplies said control signal to said control terminal of said first controlled conduction means to light said auxiliary lamp during at least portions of said start-up and said cool-down modes of operation of said high intensity discharge lamp whereby said auxiliary lamp provides supplemental lighting when the level of said luminescence of said high intensity discharge lamp is reduced.
49. A control system according to claim 1 wherein said switch means is a reed switch.
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