High-temperature ultra-low ripple multi-stage LED driver and LED control circuits
View Patent ↗Techniques for high temperature ultra-low ripple multi-stage LED driver circuit together with LED control circuits are disclosed.
1. An LED illumination apparatus comprising:
a lamp base comprising an inner volume; and
an LED driver circuit disposed within the inner volume, wherein, the LED driver circuit comprises:
a first stage converter operably connected to an alternating current power source, the first stage converter configured to produce a half-wave rectified voltage waveform comprising a combined DC and twice line frequency ripple between a first terminal and a second terminal;
a second stage converter comprising:
inputs operably connected to the first terminal and to the second terminal; and
two driving terminals; and
a capacitor connected across the first terminal and the second terminal, the capacitor configured to store charge from the half-wave rectified voltage waveform and to discharge charge to the second stage, wherein,
the capacitor is selected from a ceramic capacitor, a tantalum capacitor, and a thin film capacitor; and
the capacitor is characterized by a capacitance from about 0.1 μF to about 50 μF; and
the inner volume is characterized by a temperature from about 105° C. to about 175° C. when the LED illumination apparatus is operating; and
at least one light emitting diode operably connected to the two driving terminals.
2. The apparatus of claim 1 , wherein the ripple across the capacitor is at least 15 Volts.
3. The apparatus of claim 1 , wherein the capacitor comprises multiple capacitors in parallel.
4. The apparatus of claim 1 , wherein the LED driver circuit and the at least one LED are mounted on a printed circuit board.
5. The method of claim 1 , wherein the capacitor comprises multiple capacitors in parallel.
6. The method of claim 1 , wherein the LED driver circuit and the at least one LED are mounted on a printed circuit board.
7. The lamp of claim 1 , wherein the capacitor comprises multiple capacitors in parallel.
8. The lamp of claim 1 , wherein the LED driver circuit and the at least one LED are mounted on a printed circuit board.
9. A method for assembling an LED illumination apparatus comprising:
providing a lamp base, wherein the lamp base comprises an inner volume;
providing an LED driver circuit within the inner volume, wherein,
the LED driver circuit comprises:
a first stage converter operably connected to an alternating current power source, the first stage converter configured to produce a half-wave rectified voltage waveform comprising a combined DC and twice line frequency ripple between a first terminal and a second terminal;
a second stage converter comprising;
inputs operably connected to the first terminal and to the second terminal; and
two driving terminals; and
a capacitor connected across the first terminal and the second terminal, the capacitor configured to store charge from the half-wave rectified voltage waveform and to discharge charge to the second stage, wherein,
the capacitor is selected from a ceramic capacitor, a tantalum capacitor, and a thin film capacitor; and
the capacitor is characterized by a capacitance from about 0.1 μF to about 50 μF; and
the inner volume is characterized by a temperature from about 105° C. to about 175° C. when the LED illumination apparatus is operating; and
providing at least one light emitting diode operably connected to the two driving terminals.
10. The method of claim 9 , wherein the ripple across the capacitor is at least 15 Volts.
11. An LED lamp comprising:
a lamp base comprising an inner volume;
an LED driver circuit disposed within the inner volume, wherein,
the LED driver circuit comprises:
a first stage converter operably connected to an alternating current power source, the first stage converter configured to produce a half-wave rectified voltage waveform comprising a combined DC and twice line frequency ripple between a first terminal and a second terminal;
a second stage converter comprising:
inputs operably connected to the first terminal and to the second terminal; and
two driving terminals; and
a capacitor connected across the first terminal and the second terminal, the capacitor configured to store charge from the half-wave rectified voltage waveform and to discharge charge to the second stage, wherein,
the capacitor is selected from a ceramic capacitor, a tantalum capacitor, and a thin film capacitor; and
the capacitor is characterized by a capacitance from about 0.1 μF to about 50 μF; and
the inner volume is characterized by a temperature from about 105° C. to about 175° C. when the LED illumination apparatus is operating; and
at least one light emitting diode operably connected to the two driving terminals.
12. The lamp of claim 11 , wherein the lamp is characterized by a form factor selected from at least one of, an A series lamp, a PS series lamp, a B series lamp, and a C series lamp.
13. The lamp of claim 11 , wherein the lamp is characterized by a form factor selected from at least one of, an MR series lamp, a BR series lamp, a G series lamp, a T series lamp, A BT series lamp, an E series lamp, an ED series lamp, an AR series lamp, and a PAR series lamp.
14. The lamp of claim 11 , wherein the ripple across the capacitor is at least 15 Volts.