High intensity discharge mercury vapor lamp dimming system
阅读：141发布：2021-10-21
专利汇可以提供High intensity discharge mercury vapor lamp dimming system专利检索，专利查询，专利分析的服务。并且A switching regulator has its output applied to a high intensity discharge mercury vapor lamp which has a parallel-connected capacitor. The capacitor has a value of less than about 2 microfarads and permits dimming of the lamp by control of the current from the switching regulator. The switching regulator is provided with a negative feedback control arrangement, and has a simplified circuit whereby a transistor switch is turned off to a relatively ''''soft'''' state by a first control circuit and then to a ''''hard'''' turnoff state by a second control circuit. The second control circuit controls the turn on of the switching regulator. A rapid warm-up circuit is also provided which cooperates with the dimming control circuit so that the rapid warmup circuit does not interfere with the dimming circuit after the tube is in its normal operational condition.，下面是High intensity discharge mercury vapor lamp dimming system专利的具体信息内容。
1. A switching regulator comprising, in combination: a DC power source, a transistor switch means, a choke and a high intensity discharge lamp load connected in series with one another; first diode means connected in closed series relation with said choke and said load; and load current monitoring means coupled to said load and producing an output signal related to the magnitude of current in said load; switch control means for operating said transistor switch means between a conductive and non-conductive condition; bias voltage source means connected to said switch control means for operating said switch control means to allow operation of said transistor switch means between its said conductive condition and non-conductive condition; means connecting said output signal of said current monitoring means to said switch control means, whereby said switch control means operates to cause said transistor switch means to begin to limit current therethrough when load current reaches a predetermined value; and second diode means having one of its anode or cathode electrodes connected to the corresponding one of the anode or cathode electrodes of said first diode means, and having the other of the anode or cathode electrodes connected to the output of said bias voltage source means whereby, when said transistor switch means starts to limit current, and said first diode means begins to conduct current, said bias voltage source means is removed from said switch control means, and said transistor switch means turns fully off, and whereby said transistor switch means becomes conductive when the current in said load decreases below a given value, and said first diode means stops conducting forward current and said bias voltage source means is reapplied to said switch control means; a capacitor connected in parallel with said lamp, and dimming circuit means connected to said transistor switch means; said capacitor having a value small enough to permit dimming of said lamp to at least about 5 percent of its full intensity.
2. The switching regulator of claim 1 wherein said current monitoring means comprises a resistor connected in series with said load.
3. The switching regulator of claim 1 wherein said dimming circuit means includes variable control voltage means for applying a variable input voltage to said switch control means, thereby to adjust the load current value at which said transistor switch means is shut off, thereby to control the average current through said load.
4. The switching regulator of claim 1 wherein said capacitor has a value of less than 2 microfarads and wherein said lamp has a wattage of about 100 watts.
5. The switching regulator of claim 1 wherein said lamp is a mercury vapor lamp.
6. An energizing circuit for operating and dimming a high intensity discharge lamp load, comprising in combination: a high intensity discharge lamp; a source of DC power; lamp current regulator means connected between said lamp and said source of DC power for controlling the current applied to said lamp; input control circuit means for controlling said lamp current regulator means; dimmer control means connected to said input control circuit means for effecting dimming of the light output of said lamp; and a capacitor connected in parallel with said lamp; said capacitor having a capacitance value; said capacitance value being less than a given value, and being sufficiently small, whereby the operation of said dimmer control means dims the output of said lamp to about 5 percent of its full intensity.
7. The circuit of claim 6 wherein said lamp is a 100 watt lamp, and wherein said capacitor has a value less than 2 microfarads.
8. The circuit of claim 6 wherein said lamp is a mercury vapor lamp.
9. The circuit of claim 6 wherein said lamp current regulator means comprises a switching regulator.
10. The circuit of claim 9 wherein said capacitor has a value of less than 2 microfarads when said lamp is a 100 watt lamp.
11. The circuit of claim 6 which further includes dimming speed increasing circuit means for increasing dimming speed; said dimming speed circuit means connected to said input control circuit means and to said lamp, and being operable to cause said lamp current regulator means to tend to dynamically adjust lamp current to a dimmed condition in excess of the dimming called for by an adjustment of said dimmer control means.
12. An energizing circuit for operating and dimming a high intensity discharge lamp load, comprising in combination: a high intensity discharge lamp; a source of DC power; lamp current regulator means connected between said lamp and said source of DC power for controlling the current applied to said lamp; input control circuit means for controlling said lamp current regulator means; dimmer control means connected to said input control circuit means for effecting dimming of the light output of said lamp; rapid warm-up circuit means connected to said input control circuit means and connected to said lamp for increasing lamp current by a predetermined and controlled amount over its normal current when said lamp is relatively cold and the voltage thereacross is below a given value which is less than the normal voltage drop across said lamp when said lamp is heated; and warm-up circuit disabling means connected between said warm-up circuit means and said dimmer control means for disabling said warm-up circuit means when the operation of said dimmer control means reduces the voltage across said lamp to a value less than some given value less thAn said normal voltage drop across said lamp; said rapid warm-up circuit means operating to increase lamp current to a multiple greater than one of its normal full intensity magnitude, when the voltage drop across said lamp is below a first voltage, and wherein said rapid warm-up circuit means is ineffective to change the lamp current from its said normal full intensity magnitude when the lamp voltage is above a second voltage which is greater than said first voltage, and whereby said warm-up circuit disabling means disables said warm-up circuit means when the voltage drop across said lamp is reduced to below said second voltage by the operation of said dimmer control means.
13. The circuit of claim 12 wherein said rapid warmup circuit means operates to increase lamp current to about twice its normal magnitude when the voltage drop across said lamp is below about 50 volts, and is ineffective to change the lamp current when the lamp voltage is above about 100 volts; and whereby said warm-up circuit disabling means disables said warm-up circuit means when the voltage drop across said lamp is reduced to below about 100 volts by the operation of said dimmer control means.
14. The circuit of claim 12 which further includes dimming speed increasing circuit means for increasing dimming speed; said dimming speed circuit means connected to said input control circuit means and to said lamp, and being operable to cause said lamp current regulator means to tend to dynamically adjust lamp current to a dimmed condition in excess of the dimming called for by an adjustment of said dimmer control means.
15. An energizing circuit for operating and dimming a high intensity discharge lamp load, comprising in combination: a high intensity discharge lamp; a source of DC power; lamp current regulator means connected between said lamp and said source of DC power for controlling the load current applied to said lamp; input control circuit means for controlling said lamp current regulator means; dimmer control means connected to said input control circuit means for effecting dimming of the light output of said lamp; and dimming speed increasing circuit means for increasing dimming speed; said dimming speed circuit means connected to said input control circuit means and to said lamp, and being operable to cause said lamp current regulator means to tend to dynamically adjust lamp current to a dimmed condition in excess of the dimming called for by an adjustment of said dimmer control means.
16. An energizing circuit for operating and dimming a high intensity discharge lamp load, comprising in combination: a high intensity discharge lamp; a source of DC power; lamp current regulator means connected between said lamp and said source of DC power for controlling the load current applied to said lamp; input control circuit means for controlling said lamp current regulator means; dimmer control means connected to said input control circuit means for effecting dimming of the light output of said lamp; said dimmer control means dimming the output intensity of said high intensity discharge lamp to a value substantially less than 70% of its full output intensity.
17. The energizing circuit as set forth in claim 16 wherein said dimmer control means dims said output intensity of said high intensity discharge lamp to a value substantially less than 5% of its full output intensity.
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