Full-voltage constant-current double-color LED lamp bead

Abstract

The utility model provides a full-voltage constant-current double-color LED lamp bead which comprises a first constant-current chip, a second constant-current chip, a green light chip, a red light chip and an LED support, and three bonding pads are distributed on the LED support and are the A-pole bonding pad, the B-pole bonding pad and the C-pole bonding pad respectively. According to the full-voltage constant-current double-color LED lamp bead, a wide-voltage constant-current double-color LED is adopted, the function that one lamp can have one color or two colors or three colors is achieved, a voltage source can be directly used, and the full-voltage constant-current double-color LED lamp bead is convenient to use. The application is convenient; through an integrated packaging technology, a plurality of chips are integrated in a small-size lamp bead, so that the size is small, the occupied space is small, and the cost is low; the device can be widely used in the field of condition display of high-low voltage electric appliances, electric cabinet indicating lamps, inductors, chargers and the like. The problem that an LED cannot be directly connected with a voltage source and can only be driven by constant current is solved, a user does not need to know peripheral voltage any more, the LED can be used by being directly connected with the voltage source, the red light chip and the green light chip are connected in a routing mode in parallel, the effect of clamping 3V is achieved, the LED chips are prevented from being broken down when the LED is connected with reverse high voltage, and the reliability of the LED is improved.

Description

Technical Field

[0001] This invention relates to the field of LED component technology, and in particular to a full-voltage constant-current dual-color LED lamp bead. Background Technology

[0002] Current LED chips cannot be directly powered by a voltage source; they require a constant current supply to function. This is due to the characteristics of LEDs. Generally, white LEDs operate normally at around 2.8–3V. (See [link to relevant documentation]). Figure 8 As shown, if the voltage exceeds the operating range, after 3.2V, the current increases exponentially for every 0.1V increase, and the power P=UI increases significantly, easily burning out the LED chip. This is why LEDs must be powered by a constant current source. See also... Figure 9 As shown, the simplest way to drive an LED is to use an external series resistor to limit the current and keep it lit. However, the current in a resistor increases proportionally with the voltage. Different voltages require different resistor values, and voltage fluctuations do not provide effective protection. A common example is the indicator light on a 220V power strip, which uses a resistor for current limiting. The drawback is that voltage fluctuations cannot effectively protect the LED, making it prone to burnout. See also... Figure 10 As shown, LED indicator lights in demanding applications require a voltage regulator circuit to ensure their normal and reliable operation. Because high- and low-voltage electrical appliances, including indicator lights, typically operate at various voltages: 3.3V, 5V, 9V, 12V, 24V, 36V, 48V, 110V, 220V, etc., the voltage varies, and the Zener diode and current-limiting resistor need to be adjusted and changed accordingly, making operation inconvenient. Summary of the Invention

[0003] In view of this, in order to solve the problems existing in the technical background, the present invention proposes a full-voltage constant-current dual-color LED bead. It employs constant-current chips, integrating two constant-current chips, one red LED chip, and one green LED chip into a small 0805-sized (2.0 x 1.2 mm) LED bead through a series-parallel configuration. This solves the problem that LEDs cannot be connected to a voltage source and can only be driven by constant current. It eliminates the need to consider external voltage and allows for direct connection and use. The specific technical solution is as follows:

[0004] A full-voltage constant-current dual-color LED chip includes a first constant-current chip, a second constant-current chip, a green light chip, a red light chip, and an LED bracket. The LED bracket has three pads distributed on it, namely an A-pad, a B-pad, and a C-pad. The green light chip is fixed to the A-pad on the LED bracket with die-attach adhesive. The first and second constant-current chips are fixed to the A-pad and B-pad with a first conductive silver paste, respectively. The red light chip is fixed to the C-pad with a second conductive silver paste. Four gold wires are connected to the first constant-current chip, the second constant-current chip, the green light chip, and the red light chip to form a complete circuit.

[0005] Furthermore, it also includes transparent silicone, which is used to encapsulate the first constant current chip, the second constant current chip, the green light chip, the red light chip and the LED bracket by filling transparent silicone with a hot press mold. This protects the first constant current chip, the second constant current chip, the green light chip, the red light chip and the gold wire, forming a complete component.

[0006] Furthermore, the green light chip is a bipolar chip, placed on the A-pole pad, and the red light chip is placed on the C-pole pad. The red light chip has reverse polarity, positive polarity, and dual electrodes. Without replacing the LED bracket, it can be universally used by changing the wire bonding position, which greatly simplifies the selection of materials.

[0007] Furthermore, the red and green light chips are connected in parallel by wire bonding to clamp each other at 3V, preventing the LED chip from being damaged when connected to a reverse high voltage.

[0008] The above technical solution has the following beneficial effects:

[0009] This invention employs a wide-voltage constant-current dual-color LED, enabling one LED to function as one, two, or three colors. It can be directly connected to a voltage source, making it convenient to use. Through integrated packaging technology, multiple chips are integrated into a small-sized LED bead, resulting in small size, small footprint, and low cost. It can be widely used in high and low voltage electrical appliances, electrical cabinet indicator lights, sensors, chargers, and other status display fields. It solves the problem that LEDs cannot be directly connected to a voltage source and can only be driven by constant current. Users no longer need to worry about external voltage; they can directly connect to a voltage source for use, greatly simplifying the application of LEDs. The red and green light chips are wired in parallel to clamp each other at 3V, preventing the LED chip from being damaged when connected to a reverse high voltage, thus improving the reliability of the LED. Attached Figure Description

[0010] Figure 1 This is a three-dimensional structural diagram of a full-voltage constant-current dual-color LED lamp bead according to the present invention;

[0011] Figure 2 This is a schematic diagram of the structure of a full-voltage constant current dual-color LED lamp bead after being filled with transparent silicone through a hot press mold according to the present invention;

[0012] Figure 3 This is a front structural diagram of a dual-color LED bead with full voltage constant current according to the present invention;

[0013] Figure 4 This is a circuit diagram of a dual-color LED wide-voltage constant current LED bead according to the present invention;

[0014] Figure 5This is a schematic diagram of the three pad distribution of a full-voltage constant-current dual-color LED lamp bead according to the present invention;

[0015] Figure 6 This is a schematic diagram of the structure of a red-light-reflecting chip for a full-voltage constant-current dual-color LED lamp bead according to the present invention;

[0016] Figure 7 This is a schematic diagram of the structure of the positive electrode red light chip of a full-voltage constant-current dual-color LED lamp bead according to the present invention.

[0017] Figure 8 This is a diagram of the current-voltage characteristics of LEDs in the existing technology;

[0018] Figure 9 This is the simplest current-limiting power supply circuit diagram for LEDs in the current technology.

[0019] Figure 10 This is a circuit diagram of a current-limiting and voltage-regulating LED power supply in the existing technology.

[0020] Figure 11 A schematic diagram of the structure of a dual-electrode red light chip for a full-voltage constant-current dual-color LED lamp bead;

[0021] In the diagram: 1-LED bracket; 2-die bonding adhesive; 3-first constant current chip; 4-A electrode pad; 5-first conductive silver paste; 6-C pad; 7-second conductive silver paste; 8-red light chip; 9-B electrode pad; 10-second constant current chip; 11-gold wire; 12-green light chip; 13-transparent silicone. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] See Figures 1-7 and Figure 11The illustrated full-voltage constant-current dual-color LED chip includes a first constant-current chip 3, a second constant-current chip 10, a green light chip 12, a red light chip 8, and an LED bracket 1. The LED bracket 1 has three pads distributed on it: an A-pole pad 4, a B-pole pad 9, and a C-pole pad 6. The green light chip 12 is fixed to the A-pole pad 4 on the LED bracket 1 by die-attach adhesive 2. The first constant-current chip 3 and the second constant-current chip 10 are fixed to the A-pole pad 4 and the B-pole pad 9 by a first conductive silver paste 5. The red light chip 8 is fixed to the C-pole pad 6 by a second conductive silver paste 7. Four gold wires 11 are connected to the first constant-current chip 3, the second constant-current chip 10, the green light chip 12, and the red light chip 8 to form a complete circuit.

[0024] In this embodiment, a transparent silicone 13 is also included. The first constant current chip 3, the second constant current chip 10, the green light chip 12, the red light chip 8 and the LED bracket 1 are encapsulated by filling the transparent silicone 13 with a hot press mold. This protects the first constant current chip 3, the second constant current chip 10, the green light chip 12, the red light chip 8 and the gold wire 11, forming a complete component.

[0025] See Figure 4 As shown, a constant current diode is used: constant current in the forward direction and conduction in the reverse direction. All components are bare chips, combined in series and parallel to form a novel functional LED device. A 2mA high-voltage constant current chip is selected (even at 220V, the thermal power P=UI is less than 0.5W), connected in series and parallel with red and green LED chips, enabling operation within an ultra-wide voltage range of 3–220V.

[0026] A positive, B negative: Current flows from terminal A, through the first constant current chip 3, through the green light chip 12, and then through the second constant current chip 10 for current limiting, to terminal B. At this time, the green light is on.

[0027] B positive, A negative: Current flows from the B terminal to the second constant current chip 10, through the red light chip 8, and then through the first constant current chip 3 for current limiting, before reaching the A terminal. At this time, the red light is on.

[0028] A pulsed alternating voltage is applied to AB, causing green and red lights to illuminate alternately, mixing to form yellow light. This invention achieves a single lamp with three colors and a wide voltage range of 3-220V constant current within a small size.

[0029] In this invention, red LED chips and green LED chips are wired in parallel to clamp each other at 3V, preventing the LED chips from being damaged when connected to a reverse high voltage.

[0030] Example 2, based on Example 1, describes a bipolar chip 12 placed on pad A 4 and a red chip 8 placed on pad C 6. The red chip 8 has reverse polarity, positive polarity, and dual electrodes. This eliminates the need to replace the LED bracket 1; by changing the wire bonding position, it can be universally used, greatly simplifying material selection. The red chip 8 and green chip 12 are wired in parallel to clamp each other at 3V, preventing the LED chip from being damaged when connected to a reverse high voltage.

[0031] This invention features a three-pad structure (A, B, and C). Green LEDs are typically bipolar chips, placed on pad A (4). Red LED chips (8) are placed on pad C (6). This design provides red LED chips (8) with reverse polarity, positive polarity, and dual electrodes, eliminating the need to replace the LED bracket 1. By simply changing the wire bonding position, it becomes universally applicable, greatly simplifying material selection.

[0032] This invention uses a wide-voltage constant current dual-color LED, which can be used as one color, two colors or three colors. It can be used directly with a voltage source, is easy to use, small in size, occupies little space, and has low cost. It can be widely used for status display of high and low voltage electrical appliances, electrical cabinet indicator lights, sensors, chargers and other devices.

[0033] This invention solves the problem that LEDs cannot be connected to a voltage source and can only be driven by a constant current. It eliminates the need to consider external voltage; they can be used directly after connection.

[0034] This invention relates to a wide-voltage dual-color LED that can be directly powered by a voltage source. It utilizes a 2mA high-voltage constant-current chip, covering a full voltage range of 3–220V, making it extremely convenient to use without the need for resistors or voltage regulator circuits. This represents a breakthrough in LED applications, greatly simplifying LED usage, saving space, and reducing costs.

[0035] This invention relates to a wide-voltage dual-color constant current LED element. When A is positive and B is negative, green light illuminates; when B is positive and A is negative, red light illuminates; when connected to alternating current, red and green mixed colors illuminate yellow. This achieves 3 colors in one LED for status display. It is small in size, low in power, and covers a voltage range of 3–220V, suitable for use across the entire voltage range. It can be widely applied to high and low voltage electrical appliances, push-button indicator lights, sensors, chargers, and other status indication applications.

[0036] In practical use, the present invention has three pads distributed on the LED bracket 1, namely A pad 4, B pad 9 and C pad 6.

[0037] The green LED chip 12 is fixed to the A-pad 4 using die-attach adhesive 2. The first constant current chip 3 and the second constant current chip 10 are fixed to the A-pad 4 and B-pad 9 using first conductive silver paste 5. The red LED chip 8 is fixed to the C-pad 6 using second conductive silver paste 7. Four gold wires 11 are drilled on the first constant current chip 3, the second constant current chip 10, the green LED chip 12, and the red LED chip 8 to form a complete circuit. The chips and gold wires 11 are encapsulated and protected using a hot-press mold filled with transparent silicone 13, forming a complete component. The encapsulated full-voltage constant current dual-color LED is tested to ensure its performance meets the requirements, after which it can be widely used in various electronic devices.

[0038] This component is suitable for mass production and has low manufacturing costs. It requires no current-limiting resistor, eliminating the need for external voltage regulator and current-limiting circuitry, thus saving cost and space, and is simple to use.

[0039] This invention integrates two constant current chips, one red LED chip, and one green LED chip into a small LED bead with a size of 0805 (2.0 x 1.2 mm) through a series-parallel configuration. This solves the problem that LEDs cannot be connected to a voltage source and can only be driven by constant current. There is no need to pay attention to the external voltage; they can be used directly after connection. This is a major breakthrough in the application of LED components.

[0040] The basic principles and main features of the present invention have been described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from the spirit and scope of the present invention. All such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the invention is defined by the appended claims and their equivalents.

Claims

1. A dual-color LED bead with full voltage constant current, characterized in that, The LED structure includes a first constant current chip (3), a second constant current chip (10), a green light chip (12), a red light chip (8), and an LED bracket (1). The LED bracket (1) has three pads distributed on it, namely the A-pole pad (4), the B-pole pad (9), and the C-pole pad (6). The green light chip (12) is fixed to the A-pole pad (4) on the LED bracket (1) by die bond adhesive (2). The first constant current chip (3) and the second constant current chip (10) are fixed to the A-pole pad (4) and the B-pole pad (9) by the first conductive silver paste (5). The red light chip (8) is fixed to the C-pole pad (6) by the second conductive silver paste (7). Four gold wires (11) are connected to the first constant current chip (3), the second constant current chip (10), the green light chip (12), and the red light chip (8) to form a complete circuit.

2. The all-voltage constant current dual-color LED lamp bead according to claim 1, characterized in that, It also includes transparent silicone (13), which is used to encapsulate the first constant current chip (3), the second constant current chip (10), the green light chip (12), the red light chip (8) and the LED bracket (1) by filling the transparent silicone (13) with a hot press mold. This protects the first constant current chip (3), the second constant current chip (10), the green light chip (12), the red light chip (8) and the gold wire (11), forming a complete component.

3. The all-voltage constant current dual-color LED lamp bead according to claim 1, characterized in that, The green light chip (12) is a bipolar chip and is placed on the A-pole pad (4). The red light chip (8) is placed on the C-pole pad (6). The red light chip (8) has reverse polarity, positive polarity and dual electrodes. It does not require replacing the LED bracket (1). By changing the wire bonding position, it can be universal, which greatly facilitates the selection of materials.

4. The all-voltage constant current dual-color LED lamp bead according to claim 1, characterized in that, The red light chip (8) and the green light chip (12) are connected in parallel by wire to clamp each other at 3V, preventing the LED chip from being damaged when the LED is connected to a reverse high voltage.

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