Constant-current driving type LED capable of automatically adjusting power at over-temperature
By employing a series arrangement of constantly lit and controllable light groups, a parallel arrangement of constantly lit and controllable light groups, a parallel arrangement of constantly lit and controllable light groups, a parallel arrangement of constantly lit light groups, a parallel arrangement of constantly lit light groups, and a parallel arrangement of normally open temperature control switches to reduce the number of lights emitted, the purpose of protecting the COB light board is achieved.
Patent Information
- Application Number
- CN202423099809.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-16
AI Technical Summary
Existing LED lights are prone to overheating in high-temperature environments, causing the COB light board to burn out.
The system employs a series arrangement of constantly lit and controllable light groups, connected in parallel with a normally open temperature control switch. The LEDs are controlled by temperature sensing, achieving constant current drive with automatically adjusted power. The number of LEDs illuminated is controlled by temperature sensing, thus protecting the COB light board.
This LED light effectively reduces the temperature of the COB lamp board, preventing overheating and burnout, and achieves constant current drive for automatic power adjustment.
Smart Images
Figure CN223639418U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to LED lamp technical field, concretely relates to a constant current drive type LED of over temperature can automatic regulation power. BACKGROUND
[0002] When the luminous body such as light emitting chip etc. is used, heat will be generated, and if the power is too large, it will further lead to the increase of heat, in COB technology, multiple light emitting chips are adhered on the PCB substrate by conductive or non-conductive glue to constitute COB lamp board, and the heat generated in the light emitting process of light emitting chip is easy to cause the whole COB lamp board to overheat and even to burn out. SUMMARY
[0003] In view of the deficiencies in the prior art, the utility model aims at providing a constant current drive type LED of over temperature can automatic regulation power to solve the problems mentioned in the background art.
[0004] The utility model discloses the following technical scheme realizes:
[0005] A constant current drive type LED of over temperature can automatic regulation power, series arrangement's always light group and at least one controllable light group, still include at least one always open temperature control switch, always open temperature control switch is parallelly connected to the both ends of controllable light group.
[0006] Further, the number of controllable light group is two groups, and they are first controllable light group and second controllable light group, and first controllable light group and second controllable light group are in series, the number of always open temperature control switch is two, and they are first always open temperature control switch and second always open temperature control switch, second always open temperature control switch is parallelly connected to the both ends of first controllable light group and second controllable light group, and first always open temperature control switch is parallelly connected to the both ends of second controllable light group.
[0007] Further, the number of controllable light group is two groups, and they are first controllable light group and second controllable light group, and first controllable light group and second controllable light group are in series, the number of always open temperature control switch is two, and they are first always open temperature control switch and second always open temperature control switch, first always open temperature control switch is parallelly connected to the both ends of first controllable light group, and second always open temperature control switch is parallelly connected to the both ends of second controllable light group.
[0008] Further, it further includes always closed temperature control switch arranged in series with always light group.
[0009] Further, the number of luminous body of always light group is equal to the number of luminous body of first controllable light group, and the number of luminous body of second controllable light group is twice the number of luminous body of always light group.
[0010] Further, the substrate is provided, the light emitting bodies of the constant light group and the first controllable light group are arranged along the center symmetry of the substrate and are arranged in the central region of the substrate, the light emitting bodies of the second controllable light group are arranged along the center symmetry of the substrate and are arranged in the two side regions of the substrate.
[0011] Further, the normally closed temperature control switch, the first normally open temperature control switch and the second normally open temperature control switch are arranged in the peripheral region of the substrate.
[0012] Further, when the temperature reaches N1, the first normally open temperature control switch is switched to the closed state; when the temperature reaches N2, the second normally open temperature control switch is switched to the closed state; when the temperature reaches N3, the normally closed temperature control switch is switched to the open state, and N2-N1≥1°, N3-N2≥1°.
[0013] Further, the N1≥55°.
[0014] Further, the constant current driving type LED is a COB packaging structure or a patch type LED lamp plate structure.
[0015] The beneficial effect of the utility model is: a constant current driving type LED capable of automatically adjusting power over temperature, a constant light group and at least one controllable light group arranged in series; further comprising at least one normally open temperature control switch, the normally open temperature control switch is connected in parallel to the two ends of the controllable light group, when the temperature reaches the temperature threshold of the normally open temperature control switch during use, the normally open temperature control switch is closed, the controllable light group is short-circuited and does not emit light, and the reduction of the number of light emitting can reduce the temperature, thereby achieving the purpose of protecting the COB lamp plate. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is the circuit schematic diagram when full power is used in embodiment one.
[0017] Figure 2 It is the circuit schematic diagram when half power is used in embodiment one.
[0018] Figure 3 It is the circuit schematic diagram when one-third power is used in embodiment one.
[0019] Figure 4 It is the circuit schematic diagram when full extinction protection state is used in embodiment one.
[0020] Figure 5 It is the circuit schematic diagram of embodiment two.
[0021] Figure 6 It is the schematic diagram of the position relationship between the substrate and the COB light emitting chip.
[0022] Among them, the above drawings include the following reference signs:
[0023] 1. first controllable lamp group; 2. second controllable lamp group; 3. always-on lamp group. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It should be noted that the description of these embodiments is used to help understand the present application and does not constitute a limitation on the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.
[0025] Referring to Figures 1 to 6 As shown in the figure, a constant-current driving type LED with power automatically adjusted over temperature includes an always-on lamp group 3 and at least one controllable lamp group arranged in series. It also includes at least one normally open temperature control switch, which is connected in parallel across the controllable lamp group. When the temperature reaches the temperature threshold of the normally open temperature control switch during use, the normally open temperature control switch is closed, causing the controllable lamp group to be short-circuited and not to emit light. The reduction in the amount of light emitted can lower the temperature, thereby achieving the purpose of protecting the COB lamp panel.
[0026] As a first embodiment: the number of controllable lamp groups is two, which are the first controllable lamp group 1 and the second controllable lamp group 2, and the first controllable lamp group 1 and the second controllable lamp group 2 are connected in series. The number of normally open temperature control switches is two, which are the first normally open temperature control switch and the second normally open temperature control switch. The second normally open temperature control switch is connected in parallel across the first controllable lamp group 1 and the second controllable lamp group 2, and the first normally open temperature control switch is connected in parallel across the second controllable lamp group 2.
[0027] It also includes a normally closed temperature control switch arranged in series with the always-on lamp group 3.
[0028] Specifically, the constant-current driving type LED of the present application includes but is not limited to COB packaging structure or SMD LED lamp panel structure for manufacturing. COB packaging structure: a process in which a bare chip is fixed directly on a printed circuit board, then wire bonding is performed, and the chip and the wire are protected by organic glue. SMD LED is attached to the surface of the circuit board, suitable for SMT processing, and can be reflow soldered.
[0029] In summary, the constant-current driving type LED of the present application can adopt COB packaging structure or SMD LED lamp panel structure. These two structures have their own advantages and are suitable for different application scenarios and needs. COB packaging is suitable for high-density integration applications due to its high integration and cost advantage, while SMD LED lamp panel is suitable for mass production due to its miniaturization, lightweight and automated production advantages.
[0030] The number of light emitters in the constantly lit light group 3 is equal to the number of light emitters in the first controllable light group 1, and the number of light emitters in the second controllable light group 2 is twice the number of light emitters in the constantly lit light group 3.
[0031] Among them, the first normally open temperature control switch, the second normally open temperature control switch, and the normally closed temperature control switch are surface mount miniature temperature control switches.
[0032] Reference Figures 1 to 4 As shown in the diagram, TK1 is the first normally open temperature control switch, TK2 is the second normally open temperature control switch, TK3 is the third normally open temperature control switch, LED1 to LED36 are COB light-emitting chips, and V+ and V- are the positive and negative terminals of the power supply. LED1 to LED9 are the 3rd normally lit light group, LED10 to LED18 are the 2nd controllable light group, and LED19 to LED36 are the 1st controllable light group.
[0033] Figure 1 This is a circuit diagram for full power operation, such as... Figure 1 As shown, the first normally open temperature control switch and the second normally open temperature control switch are open, and the third normally open temperature control switch is closed; the entire COB light board is in full power operation mode, that is, LED1 to LED36 are all lit.
[0034] Figure 2 This is a circuit diagram for half-power operation, such as... Figure 2 As shown, when the initial power is too high, causing the substrate to overheat, i.e., when the temperature reaches the temperature threshold of the first normally open temperature control switch, the first normally open temperature control switch closes. At this time, LED1 to LED18 light up, and LED19 to LED36 are extinguished due to a short circuit caused by the closure of the first normally open temperature control switch. The power of the entire COB lamp board is reduced to 1 / 2 of its full power state.
[0035] Figure 3 A circuit diagram showing the circuit when using one-third of its power, as shown below. Figure 3 As shown, even when using half power, the power is still too high, causing the substrate to overheat and the temperature to continue rising. When the temperature reaches the temperature threshold of the second normally open temperature control switch, the second normally open temperature control switch closes. At this time, LEDs 1 to 9 light up, while LEDs 10 to 18 are extinguished due to a short circuit caused by the closed temperature control switch TK2. The power of the entire COB lamp board is reduced to 1 / 3 of the full power state.
[0036] Figure 4 The circuit diagram for the full shutdown protection state is as follows: Figure 4As shown, when 1 / 3 power is used, the power is still too high, causing the substrate to be still overheated and the temperature to continue to rise, i.e. the temperature reaches the temperature threshold of the normally closed temperature control switch, the normally closed temperature control switch is turned off. At this time, LED1-LED36 is in an open circuit disconnected state; LED1-LED36 is extinguished, and the entire COB lamp panel is in a non-working state.
[0037] As an extension of the first embodiment, the number of controllable lamp groups can be more than three, at this time, more than three corresponding normally open temperature control switches can be set, one normally open temperature control switch corresponds to one controllable lamp group, the next normally open temperature control switch corresponds to two controllable lamp groups, and so on, and the last normally open temperature control switch corresponds to all controllable lamp groups, thereby realizing more levels of COB lamp panel protection.
[0038] As preferred, when the temperature reaches N1, the first normally open temperature control switch switches to a closed state; when the temperature reaches N2, the second normally open temperature control switch switches to a closed state; when the temperature reaches N3, the normally closed temperature control switch switches to an open state, and N2-N1≥1°, N3-N2≥1°, as preferred, N1≥55°, thereby meeting the actual light-emitting situation of the COB light-emitting chip.
[0039] As shown in FIG. 5, as a second embodiment, the number of controllable lamp groups is two, which are the first controllable lamp group 1 and the second controllable lamp group 2, and the first controllable lamp group 1 and the second controllable lamp group 2 are connected in series, the number of normally open temperature control switches is two, which are the first normally open temperature control switch and the second normally open temperature control switch, the first normally open temperature control switch is connected in parallel across the first controllable lamp group 1, and the second normally open temperature control switch is connected in parallel across the second controllable lamp group 2.
[0040] That is, the difference between the second embodiment and the first embodiment is that a normally open temperature control switch is provided for each controllable lamp group, thereby realizing control of each controllable lamp group. The advantage of the first embodiment compared to the second embodiment is that when even one normally open temperature control switch fails, when the temperature rises to the temperature threshold of the next normally open temperature control switch, the next normally open temperature control switch is closed, thereby short-circuiting the multiple controllable lamp groups connected thereto, avoiding the failure of one normally open temperature control switch and the inability to effectively protect the COB lamp panel.
[0041] As shown in FIG. 6, it further includes a substrate, a plurality of COB light-emitting chips are adhered to the substrate by conductive or non-conductive glue, the light-emitting bodies of the normally on lamp group 3 and the first controllable lamp group 1 are arranged symmetrically along the center of the substrate and are arranged in the central region of the substrate; the light-emitting bodies of the second controllable lamp group 2 are arranged symmetrically along the center of the substrate and are arranged in the two side regions of the substrate, through the above arrangement, when the first controllable lamp group 1 and the second controllable lamp group 2 are extinguished in turn, the COB lamp panel can still emit light uniformly.
[0042] The normally closed temperature control switch, the first normally open temperature control switch and the second normally open temperature control switch are arranged at the peripheral region of the substrate, so that the structure arrangement of the whole COB lamp panel is compact.
[0043] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0044] In the description of the present application, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features.
[0045] The above is only the preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A constant current driven LED with automatically adjustable power over temperature, characterized in that: The constant light group and the at least one controllable light group are arranged in series; and the at least one normally-open temperature control switch is connected in parallel to both ends of the controllable light group.
2. The over-temperature automatically adjustable power constant current driving LED according to claim 1, characterized in that: The number of the controllable light groups is two, which are a first controllable light group and a second controllable light group, and the first controllable light group and the second controllable light group are connected in series; the number of the normally-open temperature control switches is two, which are a first normally-open temperature control switch and a second normally-open temperature control switch, the second normally-open temperature control switch is connected in parallel to both ends of the first controllable light group and the second controllable light group, and the first normally-open temperature control switch is connected in parallel to both ends of the second controllable light group.
3. The over-temperature automatically adjustable power constant current driving LED according to claim 1, characterized in that: The number of the controllable light groups is two, which are a first controllable light group and a second controllable light group, and the first controllable light group and the second controllable light group are connected in series; the number of the normally-open temperature control switches is two, which are a first normally-open temperature control switch and a second normally-open temperature control switch, the first normally-open temperature control switch is connected in parallel to both ends of the first controllable light group, and the second normally-open temperature control switch is connected in parallel to both ends of the second controllable light group.
4. The over-temperature automatically adjustable power constant current driving LED according to claim 2 or 3, characterized in that: The normally-closed temperature control switch is arranged in series with the constant light group.
5. The over-temperature automatically adjustable power constant current driving LED according to claim 4, characterized in that: The number of light emitters of the constant light group is equal to the number of light emitters of the first controllable light group, and the number of light emitters of the second controllable light group is twice the number of light emitters of the constant light group.
6. The over-temperature automatically adjustable power constant current driving LED according to claim 5, characterized in that: The constant light group and the first controllable light group are arranged along the center of the substrate and are arranged in the central region of the substrate; and the second controllable light group is arranged along the center of the substrate and is arranged in the two side regions of the substrate.
7. The over-temperature automatically adjustable power constant current driving LED according to claim 6, characterized in that: The normally-closed temperature control switch, the first normally-open temperature control switch and the second normally-open temperature control switch are arranged in the peripheral region of the substrate.
8. The over-temperature automatically adjustable power constant current driving LED according to claim 4, characterized in that: When the temperature reaches N1, the first normally-open temperature control switch switches to the closed state; when the temperature reaches N2, the second normally-open temperature control switch switches to the closed state; when the temperature reaches N3, the normally-closed temperature control switch switches to the open state, and N2-N1≥1°, N3-N2≥1°.
9. The over-temperature automatically adjustable power constant current driving LED according to claim 8, characterized in that: The N1≥55°.
10. The over-temperature automatically adjustable power constant current driving LED according to claim 1, characterized in that: The constant current driving LED is a COB packaging structure or a patch type LED lamp panel structure.