Light emitting diode (LED) torchiere lamp with overheat and overvoltage protection functions

Abstract

The present invention discloses an LED torchiere lamp with overheat and overvoltage protection functions. The LED torchiere lamp includes primarily a high-voltage rectifying circuit which rectifies high-voltage alternating current as high-voltage direct current, and an IC drive circuit. The IC drive circuit is built in with an electronic switching circuit to drive the LED lamp, an analog light dimmer circuit and a PWM light dimmer circuit, in addition to an overheat and overvoltage protection circuit which is used to improve the safety of and extend the lifetime of usage of the LED torchiere lamp, thereby having the practicality.

Claims

1. An Light Emitting Diode (LED) torchiere lamp with overheat and overvoltage protection functions, comprising: a high-voltage rectifying circuit, wherein the high-voltage rectifying circuit rectifies high-voltage alternating current as high-voltage direct current; and an Integrated Circuit (IC) drive circuit, wherein one or plural IC drive circuits is configured depending upon a quantity of a loaded chip LED lamps, wherein the high-voltage rectifying circuit is connected with the IC drive circuit without using a conventional transformer or an electrolytic capacitor, wherein constant current is provided to the LED lamp through the high-voltage rectifying circuit and the IC drive circuit, wherein when a temperature of the LED lamp exceeds a set temperature, a voltage of the LED lamp is dropped and a current in the LED lamp is decreased to cool the LED lamp to reduce brightness, and wherein the IC drive circuit is built in with an electronic switching circuit, an analog light dimmer circuit, and a Pulse Width Modulation (PWM) light dimmer circuit.

2. The Light Emitting Diode (LED) torchiere lamp with overheat and overvoltage protection functions, according to claim 1, wherein all the circuits and elements of the high-voltage rectifying current and the IC drive circuit are installed on a single PCB (Printed Circuit Board) which is disposed on a top of the torchiere lamp.

3. The Light Emitting Diode (LED) torchiere lamp with overheat and overvoltage protection functions, according to claim 1, wherein the overheat and overvoltage protection circuit starts to drop the voltage and decrease the current when the temperature of the LED lamp exceeds temperature setting of 85˜95° C., which cools down the LED lamp to reduce the brightness, thereby improving the safety of the LED torchiere lamp.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a schematic view of a prior art.

(2) FIG. 2 shows a simple schematic view of the present invention.

(3) FIG. 3 shows a schematic view of a high-voltage rectifying circuit of the present invention.

(4) FIG. 4 shows a schematic view of a switching circuit of the present invention.

(5) FIG. 5 shows a schematic view of pins of an IC drive circuit of the present invention.

(6) FIG. 6 shows a schematic view of the connection of an LED lamp at a load end of the present invention.

(7) FIG. 7 shows a schematic view of installation of circuits and elements of the present invention.

(8) FIG. 8 shows a partially enlarged schematic view of the installation of circuits and elements of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(9) Referring to FIGS. 2˜8, the present invention discloses an LED torchiere lamp with overheat and overvoltage protection functions, and more particularly to an LED torchiere lamp which includes a high-voltage input power source combining with an IC drive circuit without using a transformer and an electrolytic capacitor (as shown in FIG. 2), and which is driven by constant current. The present invention comprises primarily a high-voltage rectifying circuit 1 which rectifies high-voltage alternating current as high-voltage direct current. The functions of major elements of the high-voltage rectifying circuit 1 are described below: 1. F1—a fuse (250/1A) 110, which permits automatic shut-off to protect the circuit when a subsequent circuit is short-circuited; 2. R7 and R8—two chip resistors (22R) 120, which are used for surge (current) protection; 3. RV1—a varistor 130, which prevents the circuit from showing all kinds of transient voltage and absorbs the surge current; 4. D1—a chip bridge 140, which rectifies an AC supply mains as DC voltage; 5. D2—a chip diode 150, which protects the lumped circuit from ESD; 6. D3, D4, D5, D6—four chip diodes 150, which protect each LED from ESD; 7. R1, R2, R3, R4, R5, R6—six chip resistors (15R) 160, which modulate the current value at the IC output terminal; 8. C1, C2, C3—three chip capacitors 170, which are used as the filter capacitors at the IC supply terminal.

(10) The pin numbers and names of the IC drive circuit of the present invention are described below: 1. VCH an overvoltage detection input terminal, 2. VSSA a common, 3. CS1 connecting to a current sensing resistor 1; 4. VSSB a ground, 5. REG5 a power source at 5V, 6. TS an overheat protection input terminal, 7. VSSB a ground, 8. CS2 connecting to a current sensing resistor 2, 9. VDIM an analog light dimmer signal input terminal, 10. PWM a PWM light dimmer signal input terminal, 11. DN8 a channel 8, 12. DN7 a channel 7, 13. DN6 a channel 6, 14. DN5 a channel 5, 15. VPP a high-voltage power source, 16. VPP_ID a single-wired electronic switch power-harvesting current control terminal, 17. DN1 a channel 1, 18. DN2 a channel 2, 19. DN3 a channel 3, 20. DN4 a channel 4.

(11) First of all, referring to FIGS. 3-6, the junctions VPPA, DN1A, DN2A, DN3A, DN4 of the high-voltage rectifying circuit 1 in FIG. 3 are connected to the junctions VPPA, DN1A, DN2A, DN3A, DN4 of the LED lamp 3 in FIG. 6, and the junctions of the high-voltage rectifying circuit 1 are connected to the IC drive circuit 2 through the chip resistors 18 (OR) J1-J12 of the switching circuit, with the chip resistors 18 being used for the jumper protection. The junction VPPA of the high-voltage rectifying circuit 1 is connected to VPP1, VPP2, VPP3 of the 15.sup.th pin of U1, U2, U3 of IC drive circuit 2 through the chip resistors 18 J1, J5, J9, and then a high-voltage power source is introduced, connecting DN1A to the 14.sup.th pin and the 17.sup.th pin of U1, U2, U3 of IC drive circuit 2 through the chip resistors 18 (OR) J2, J6, J10, wherein the 14.sup.th pin and the 17.sup.th pin are DN11, DN21, DN31. DN2A is connected to the 13.sup.th pin and the 18.sup.th pin of U1, U2, U3 of IC drive circuit 2 through the chip resistors 18 (OR) J3, J7, J11, wherein the 13.sup.th pin and the 18.sup.th pin are DN12, DN22, DN32. DN3A is connected to the 12.sup.th pin and the 19.sup.th pin of U1, U2, U3 of IC drive circuit 2 through the chip resistors 18 (OR) J4, J8, J12, wherein the 12.sup.th pin and the 19.sup.th pin are DN13, DN23, DN33. Accordingly, the high-voltage rectifying circuit 1 can be connected to the IC drive circuit 2. There can be one or plural IC drive circuits 2 depending upon the quantity of the loaded chip LED lamps 3. The IC drive circuit 2 is built in with an electronic switching circuit required for driving the LED lamp 3, an analog light dimmer circuit and a PWM light dimmer circuit, in addition to an overheat and overvoltage protection circuit which is connected externally to R1, R2 for modulating the IC output current and to C1 for providing a stable filtering wave as supply power to IC drive circuit 2. Constant current is provided to the LED lamp 3 through the high-voltage rectifying current 1 and the IC drive circuit 2. When the temperature of the LED lamp 3 exceeds a temperature setting of 85˜95° C., the overheat and overvoltage protection circuit starts to drop the voltage and decrease the current to cool down and reduce the brightness of the LED lamp 3. Therefore, the safety of the LED torchiere lamp is improved and the lifetime of usage of the LED torchiere lamp is extended, thereby having the practicality.

(12) Another embodiment of the present invention is to provide an LED torchiere lamp with overheat and overvoltage protection functions, wherein the overvoltage detection input terminal VCH at the 1.sup.st pin, the overheat protection input terminal TS at the 6.sup.th pin, the analog light dimmer signal input terminal VDIM at the 9.sup.th pin, the PWM light dimmer signal input terminal at the 10.sup.th pin, and the single-wired electronic switch power-harvesting current control input terminal VPP_ID at the 16.sup.th pin, disposed on the IC drive circuit 2, can be optionally connected or disconnected according to the required function, thereby facilitating the versatility of the present invention.

(13) Still another embodiment of the present invention is to provide an LED torchiere lamp with overheat and overvoltage protection functions, wherein all the circuits and elements of the high-voltage rectifying circuit and the IC drive circuit are installed on a single PCB (Printed Circuit Board) 4 (as shown in FIG. 7 and FIG. 8) which is disposed on a top of the torchiere lamp to reduce the area of installation.

(14) By connecting the high-voltage rectifying circuit 1 with the IC drive circuit 2, constant current is provided to the LED lamp 3 without using the conventional transformer or electrolytic capacitor, and with the overhead and overvoltage protection functions. Accordingly, the safety of the LED torchiere lamp is improved and the lifetime of usage of the LED torchiere lamp is extended, thereby having the practicality.

(15) It is to be understood that the above description and drawings are only used for illustrating some embodiments of the present invention, not intended to limit the scope thereof. Any variation and deviation from the above description and drawings should be included in the scope of the present invention.