Light bulb with combination incandescent and LED illumination

Abstract

The present embodiment is a light bulb, also referred to as a lamp, in an enclosure that houses a Printed Circuit Board (PCB) that supports an array of LED packages in at least 2 correlated color temperatures with a number of arrays of incandescent light emitters.

Claims

1. A combination LED and incandescent lamp, comprising: an array of LED packages arranged inside a glass container; and an array of incandescent packages arranged inside said glass container; and a circuit configured to generate analog control voltage; wherein said circuit powers said array of LED packages where relatively cooler, bright light is emitted, said circuit powers said array of incandescent packages where relatively warmer, dim light is emitted.

2. The lamp of claim 1, wherein the lamp is configured for warm dimming, further comprising: a first array of LED packages that emits a light of a first correlated color temperature; and a second array of LED packages that emits a light of a second correlated color temperature; wherein said first array of LED packages emits a relatively warmer correlated color temperature and said second array of LED packages emits a relatively cooler correlated color temperature.

3. The lamp of claim 1 wherein; said array of incandescent packages emit a light of a color temperature in the range of 1200K to 2300K.

4. The lamp of claim 2 wherein the first array of LED packages emits a light of a correlated color temperature that is between about 1800K to 2200K and the second array of LED packages emits a light of about 2200 to 4000K.

5. A method of illuminating the lamp of claim 1 from a light of a color temperature of about 1600K to 2000K dim light to a light with a correlated color temperature of about 2200K to 4000K; the method comprising: powering said array of incandescent packages to a color temperature of about 1650K at a phase angle of approximately 10%; powering said array of LED packages at a phase angle of 25%; continuing to power said array of LED packages and said array of incandescent packages at a phase angle of 45%; holding said array of incandescent packages to approximately 65% capacity; continuing to power said array of LED packages and said array of incandescent packages; producing a light of a correlated color temperature of about 2200 to 4000K at a phase angle of 100%.

6. A method of illuminating the lamp of claim 4 from a light of a color temperature of about 1600K to 2000K to a light with a correlated color temperature of about 2200K to 4000K; the method comprising: powering said array of incandescent packages to a color temperature of about 1650K at a phase angle of approximately 10%; powering said array of LED packages that emit a light of a correlated color temperature of about 1800K to 2200K at a phase angle of 25%; continuing to power said array of LED packages that emit a light of a correlated color temperature of about 1800K to 2200K and said array of incandescent packages at a phase angle of 45%; holding said array of incandescent packages to approximately 65% capacity; continuing to power said array of LED packages that emit a light of a correlated color temperature of about 1800K to 2200K and said array of incandescent packages from a phase angle of 65% to 100% and; powering said array of LED packages that emit a light of a correlated color temperature of about 2200K to 4000K from a phase angle of 65% to 100%; producing a light of a correlated color temperature of 2200 to 4000K at a phase angle of 100%.

7. A combination LED and incandescent lamp for warm dimming, comprising: a printed circuit board fixedly engaged inside a glass container; said printed circuit board having a top portion and a bottom portion, at least a segment of said top portion being a radius with a scalloped circumference; and an array of 5-sided LED packages arranged on said printed circuit board proximal to said scallops; and an array of incandescent packages arranged on said printed circuit board; and a circuit configured to generate analog control voltage; wherein and said circuit powers said array of LED packages where relatively cooler, bright light is emitted, said circuit powers said array of incandescent packages where relatively warmer, dim light is emitted; and said 5-sided LED packages shine a portion of their light through said scallops mitigating shadowing effect.

8. The lamp of claim 7 wherein; said bottom portion being relatively narrower than said top portion provides a narrow neck; wherein said LED packages and said incandescent packages arranged about said top portion produce a light that emanates from the center of said lamp, imitating a traditional incandescent bulb.

9. The lamp of claim 8 wherein the area of said top portion is about 33% of the cross sectional area of the bulb.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The following is a brief description of the drawings, which are presented for the purposes of illustrating the disclosure set forth herein and not for the purposes of limiting the same.

(2) FIG. 1 is a front, right, perspective view of an example embodiment of the present disclosure.

(3) FIG. 2 is a rear perspective view thereof;

(4) FIG. 3 is a perspective, exploded view thereof;

(5) FIG. 4 is a flow chart of a circuit of the embodiment;

(6) FIG. 5 is a circuit diagram thereof;

(7) FIG. 6 is a graphic representation of the illumination of the embodiment from dim to bright.

DESCRIPTION

(8) A more complete understanding of the components, processes, and apparatuses disclosed herein can be obtained by reference to the accompanying figures. These figures are intended to demonstrate the present disclosure and are not intended to show relative sizes and dimensions or to limit the scope of the exemplary embodiments.

(9) Although specific terms are used in the following description, these terms are intended to refer only to particular structures in the drawings and are not intended to limit the scope of the present disclosure. It is to be understood that like numeric designations refer to components of like function.

(10) Referring to FIG. 1, FIG. 2 and FIG. 3, an example embodiment 100 is depicted in the illustration. An enclosure, also referred to as a glass globe 110 with a screw base 118 is shown in dashed lines in FIG. 1 and FIG. 2. One skilled in the art is familiar with the various sizes and shapes of lighting enclosures and electrical connection bases of common lamps, one such variation is depicted in the illustration for clarity. A Printed Circuit Board (PCB) 114 fits within the enclosure 110 and supports control and illumination electronics. The PCB 114 has a narrow neck 140 between a lower section 142 and an upper section 144. The upper portion 144 of the PCB is generally circular with a scalloped edge. Scallops 116 are arranged circumferentially between LED packages 122. In some embodiments, LED packages 122 are mounted on both sides of the PCB 114. One skilled in the art understands that a single sided PCB may be preferable to a double sided PCB depending on the design of the enclosure 110. A PAR lamp, for example, may benefit from a single sided PCB with LED packages 122 and incandescent lamps 120 on one side of a PCB. In some embodiments, some of the LED packages may be configured to produce a warm-light color in the range of 1800-2200 Kelvin while other LED packages may be configured to produce a cool-light color in the range of 2200-4000 Kelvin. An array of incandescent lamps 120 are mounted on the PCB 114. In some embodiments the incandescent lamps 120 are mounted on both sides of the PCB 114. Scallops 116 allow for light from the LED packages to shine through to the opposite side of the PCB as shown by arrows 146 (FIG. 3). In embodiments that employ 5-sided LEDs light from the 5-sided LEDs shines through scallops 116 to the opposite side of the PCB 114 preventing shadowing effect. One skilled in the art understands that shadowing may occur when structural elements such as a PCB board or control electronics interrupt the light from one or more LEDs and cast a shadow in the emitted light. Furthermore, the narrow neck 140 is designed to minimize material surrounding the LEDs and incandescent lamps, allowing light to emit in a spherical direction without shadowing, mimicking the illumination from a common incandescent light bulb.

(11) Although a more detailed description of the control electronics and their function is shown in FIG. 4 and FIG. 5, some of the control electronics are depicted in the illustrations in FIG. 1, FIG. 2 and FIG. 3. A number of control electronics are mounted on the lower section 142 of the PCB 114, including a Metal Oxide Silicone Field Effect Transistor (MOSFET), a film capacitor 128, an LED driver integrated circuit 130, an inductor 132, capacitors 134 and resistor 136. One skilled in the art understands that rearrangement of the electronic components is common between bulb sizes and styles. One example arrangement is shown here and is not intended to be limiting.

(12) FIG. 4 is a diagram 200 depicting the overall function of the circuit. The circuit is powered by AC Voltage 251 and a fuse 249 disconnects the circuit in the event of a failure, a fault, or damage. An inrush filter 250 reduces inrush current spikes, such as those present in noisy electrical environments. A surge protector 252 protects electronic components against voltage surges from exterior equipment and lightning. A rectifier 254 rectifies AC input voltage to the square root of 2 times the RMS AC Voltage 251. A first array of incandescent lamps 256 provide a warm dim light while maintaining a holding current which stabilizes forward phase dimmers. A first converter 260 converts high voltage phase angle dimming to a low voltage pulse width modulation (PWM) signal. A second converter 262 converts PWM control signal to an analog dimming signal which creates what is referred to as a soft-start. Current from the second converter 262 and from the rectifier 254 flows to the buck converter 276, also referred to as a main switching converter. The buck converter 276 sends current to a second array of incandescent lamps 282, an array of relatively higher correlated color temperature (CCT) LEDs and an array of relatively lower CCT LEDs. As the light output transitions from dim to bright current is directed from the first array of incandescent lamps 256, to the second array of incandescent lamps 282 to LEDs of relatively lower CCT 281 and finally to LEDs of relatively higher CCT 280, providing warmest light when the light is dim and relatively cooler light when the light is bright, this may be referred to as a warm-dim or dim-to-warm effect. Circuitry 278 provides feedback to the buck converter 276 to control the warm-dim effect.

(13) FIG. 5 is a circuit diagram 300 that demonstrates the electrical components, arrangement and function of the components of the disclosure. A resistor and inductor 350 make up a portion of the circuit that reduces inrush current spikes from forward-phase (TRIAC) dimmers. One skilled in the art understands that inrush current may cause damage to electronic components and produce what is referred to as a buzzing sound. A surge protector 352 protects electronic components against voltage surges from exterior equipment. A rectifier 354 rectifies AC input voltage to ?170 VDC. A first array of incandescent lamps 356 provide a warm dim light while maintaining a holding current which stabilizes forward phase dimmers. A diode 358 is referred to as a blocking diode which ensures proper operation of a first converter 360 which converts high voltage phase angle dimming to a low voltage pulse width modulation (PWM) signal. A second converter 362 converts PWM control signal to a low voltage analog dimming signal which creates what is referred to as a soft-start. In some embodiments a PWM control signal is converted to an analog dimming signal. An array of ceramic capacitors 364 smooth LED driver output. A film capacitor provides LED driver bulk storage. A resistor 368 sets constant current output of the LED driver. A series of components make up a high-frequency/high-efficiency switching loop 370. Timing resistors 372 sets operation frequency and mode, also referred to as a constant-off time. A low pass filter 374 provides additional smooth analog control voltage with a bleeder resistor. A high voltage buck converter 376 is also referred to as the main switching converter. A series of components 378 controls a dim-to-warm effect of warm and cool LEDs. Warm and cool LEDs 380 provide light at the relatively brighter range of output. A second array of incandescent lamps 382 stabilize LED driver output particularly at low voltage, also referred to as dim output.

(14) FIG. 6 is a graph 400 depicting an example embodiment of a light source providing changing CCT between dark at a phase angle of 0% and bright at a phase angle of 100%. Phase angle is measured between 0% and 100% along the horizontal axis 470 and relative output current is measured along the vertical axis 472. The current draw of the incandescent lamps is denoted by dashed line 452. The current drawn by low CCT LEDs, also referred to as warm white LEDs, having a CCT of ?1800K, is denoted by dashed line 454. The current drawn by relatively high CCT LEDs, also referred to as cool white LEDs, having a CCT of ?2700K, is denoted by dashed line 456.

(15) In the area denoted by arrow 458, with a phase angle of approximately 10%, incandescent lamps draw all current providing a dim, warm light. In the area denoted by arrow 460, with a phase angle of approximately 25% current begins to be directed to relatively low CCT LEDs, also referred to as warm CCT LEDs, in addition to the incandescent lamps that are nearly at full intensity. In the area denoted by arrow 462, with a phase angle of approximately 45% warm CCT LEDs draw increasing current and incandescent lamps are held at ?65% of their capacity. One skilled in the art understands that the life of an incandescent lamp held to a maximum of ?65% of their capacity will result in an extended life incandescent lamp. In the area denoted by arrow 464, with a phase angle of approximately 65% cool white LEDs turn on. In the area denoted by arrow 468, with a phase angle of 100%, a combination of ?1800K LEDs and ?2700K LEDs are combined to provide a light with a CCT of ?2200K.

(16) The present disclosure has been described with reference to exemplary embodiments. Obviously, modifications and alterations will occur to others upon reading and understanding the preceding detailed description. It is intended that the present disclosure be construed as including all such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.