CN110671616A - Constant voltage drive COB light source - Google Patents
Constant voltage drive COB light source Download PDFInfo
- Publication number
- CN110671616A CN110671616A CN201910805034.0A CN201910805034A CN110671616A CN 110671616 A CN110671616 A CN 110671616A CN 201910805034 A CN201910805034 A CN 201910805034A CN 110671616 A CN110671616 A CN 110671616A
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- chip
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- led
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/20—Light sources comprising attachment means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V19/00—Fastening of light sources or lamp holders
- F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
- F21V19/0015—Fastening arrangements intended to retain light sources
- F21V19/002—Fastening arrangements intended to retain light sources the fastening means engaging the encapsulation or the packaging of the semiconductor device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
- F21V23/004—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array arranged on a substrate, e.g. a printed circuit board
- F21V23/005—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array arranged on a substrate, e.g. a printed circuit board the substrate is supporting also the light source
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a constant-voltage-driven COB light source which comprises a COB substrate and at least one group of light-emitting modules packaged on the COB substrate, wherein each light-emitting module comprises an LED module and a low-voltage linear constant-current chip which are in one-to-one correspondence; the LED module comprises at least one LED chip, and the LED chip and the low-voltage linear constant-current chip are integrally packaged on the COB substrate in a bare die mode; the anode of the LED module is connected with an external power supply, and the external power supply is used for providing a 12-42V low-voltage direct-current power supply for the LED chip; the LED module is characterized in that the negative electrode of the LED module is connected with a low-voltage linear constant current chip in series, and the low-voltage linear constant current chip is used for converting a low-voltage direct current power supply output by the external power supply into a constant current power supply to drive the LED chip to work. By adopting the invention, a constant voltage power supply output by an external power supply can be converted into a constant current power supply, and the light-emitting module is driven in a low-voltage linear driving mode, thereby being more beneficial to the centralized use of lamps.
Description
Technical Field
The invention relates to the technical field of LEDs (light emitting diodes), in particular to a constant voltage driving COB (chip on board) light source.
Background
In conventional LED applications, the LED must be driven with a constant current power supply due to the non-linear V-I characteristics of the LED itself. If a plurality of groups of LED light sources are connected in parallel and share a large-current LED driving power supply, uneven brightness of the LED light sources of different groups can be easily caused. And the quantity of LED light source group is indefinite, need adjust output current size according to the quantity of LED light source. Meanwhile, if the LED light source carried by the high-current LED driving power supply has an open circuit or short circuit fault, other LED light sources will be over-current or not on. Therefore, each LED light source needs to be provided with a constant current driving power supply to supply power independently.
At present, most COB light sources are applied to commercial illumination, and the track spotlight is a lamp which is widely applied to commercial illumination and has a large using amount. The track spotlight is a small-angle lighting lamp with a track, alternating current commercial power or low-voltage direct current is provided on the track strip to provide power for the lamp, and a common method is that each track spotlight is independently provided with a constant current driving power supply. Therefore, it is necessary to design a COB light source capable of being driven by a constant voltage and directly driven by a low-voltage direct-current power supply, so that great advantages are generated in the aspects of volume, cost and product design of the track spotlight.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a small-sized high-integration constant voltage driving COB light source, which can convert a constant voltage power supply output by an external power supply into a constant current power supply and drive a light emitting module in a low voltage linear driving mode, thereby being more beneficial to the centralized use of lamps.
In order to solve the technical problem, the invention provides a constant voltage driving COB light source which comprises a COB substrate and at least one group of light-emitting modules packaged on the COB substrate, wherein each light-emitting module comprises an LED module and a low-voltage linear constant current chip which are in one-to-one correspondence; the LED module comprises at least one LED chip, and the LED chip and the low-voltage linear constant-current chip are integrally packaged on the COB substrate in a bare die mode; the anode of the LED module is connected with an external power supply, and the external power supply is used for providing a 12-42V low-voltage direct-current power supply for the LED chip; the LED module is characterized in that the negative electrode of the LED module is connected with a low-voltage linear constant current chip in series, and the low-voltage linear constant current chip is used for converting a low-voltage direct current power supply output by the external power supply into a constant current power supply to drive the LED chip to work.
As an improvement of the scheme, the low-voltage linear constant-current chip is fixed on a bonding pad of a COB substrate dam area and is covered by dam enclosing glue.
As an improvement of the above scheme, the COB substrate is a metal substrate or a ceramic substrate.
As an improvement of the scheme, the excited color of the LED chip is white light.
As an improvement of the scheme, the LED chip is a forward-mounted LED chip or a flip-chip LED blue light chip.
As an improvement of the above scheme, a group of light emitting modules is packaged on the COB substrate.
As the improvement of the scheme, a plurality of groups of light-emitting modules with different color temperatures are packaged on the COB substrate.
As an improvement of the scheme, the low-voltage linear constant-current chip is provided with an overvoltage and overheating protection unit.
As an improvement of the scheme, the low-voltage linear constant-current chip is provided with a PWM port.
The beneficial effects of the implementation of the invention are as follows:
the low-voltage linear constant current chip is arranged in the constant-voltage driving COB light source, a constant-voltage power supply output by an external power supply can be converted into a constant-current power supply through the low-voltage linear constant current chip, and the LED chip is driven in a low-voltage linear driving mode, so that the centralized use of the lamp is facilitated.
In addition, the bare chip LED chip and the low-voltage linear constant current chip are integrally packaged in the COB substrate in a bare chip mode, so that the systematic packaging of bare chips mixed with various wafer types is realized, the heat dissipation thermal resistance can be effectively reduced, the heat dissipation efficiency is improved, the mounting process is simple, the whole lamp mounting and cost are greatly reduced, and the large-scale automatic production is facilitated.
Furthermore, the overvoltage and overheating protection units are arranged on the low-voltage linear constant-current chip, so that the reliability of the product can be effectively improved, the use environment of commercial lighting large-scale lamps is facilitated, and the market application range is wide; meanwhile, the PWM port is arranged on the low-voltage linear constant-current chip, so that the dimming function can be easily realized, and the flexibility is strong.
Drawings
FIG. 1 is a schematic circuit diagram of a constant voltage driven COB light source according to the present invention;
FIG. 2 is a schematic structural diagram of a constant voltage driving COB light source low-voltage linear constant current chip of the invention;
FIG. 3 is a schematic diagram of a constant voltage driving COB light source according to the present invention;
fig. 4 is another schematic view of the constant voltage driving COB light source according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 shows a specific structure of a constant voltage driving COB light source of the present invention, which includes a COB substrate and at least one group of light emitting modules packaged on the COB substrate, where each light emitting module includes LED modules 2 and low voltage linear constant current chips 1 in one-to-one correspondence; the LED module 2 comprises at least one LED chip, and the LED chip and the low-voltage linear constant current chip 1 are integrally packaged on the COB substrate in a bare die mode; the anode of the LED module 2 is connected with an external power supply, and the external power supply is used for providing a 12-42V low-voltage direct-current power supply for the LED chip; the cathode of the LED module 2 is connected in series with the low-voltage linear constant current chip 1, and the low-voltage linear constant current chip 1 is used for converting a low-voltage direct current power supply output by the external power supply into a constant current power supply to drive the LED chip to work.
It should be noted that the external power source in the present invention is an isolated power source, and the safe voltage range of the isolated power source is up to 42V. Specifically, the principle of the low-voltage linear driving is as follows: if the external power supply outputs 36V low-voltage direct current, the rated voltage of the LED chip is 33V; if the LED chip is not driven linearly at low voltage, the current of the LED chip rises nonlinearly until the voltage of the LED chip becomes 36V or the LED chip is burnt out by overcurrent; the low-voltage linear driving has the functions of automatically adjusting the impedance of the LED chip, absorbing the rest 3V voltage and keeping the current of the LED chip constant at a rated value; the voltage of the LED chip is a multiple of 3V, if the LED chip is 2 strings, namely 6V, in order to keep a certain voltage difference, a certain working space is linearly driven for low voltage, the output of the constant voltage source must be about 9V, and then the conversion efficiency becomes too low, namely 6V/9V, and 33.3% of energy is lost when the constant voltage is converted into the constant current. Further, the output power of the low voltage dc power supply is preferably 36V, but not limited thereto.
In addition, the low-voltage linear constant-current chip 1 and the plurality of LED chips are integrally packaged on the COB substrate in a bare-crystal mode. Naked brilliant encapsulation can not change the appearance of original COB product, and convenient production design does not lead to the fact too big influence to the original authentication system of customer, supporting materials such as the original lamps and lanterns of sharing and clamping ring, simultaneously because the LED chip encapsulates on the COB base plate, is very sensitive to the temperature-sensing of LED chip, adjustment current size that can be very rapid in order to reduce the light decay of COB light source and prevent that the light source from burning out.
Therefore, the low-voltage linear constant current chip 1 is arranged in the constant-voltage driving COB light source, a constant-voltage power supply output by an external power supply can be converted into a constant-current power supply through the low-voltage linear constant current chip 1, and the LED chip is driven in a low-voltage linear driving mode, so that the centralized use of the lamp is facilitated. Meanwhile, the invention realizes the systematic packaging of the bare chip mixed with various chip types, can effectively reduce the heat dissipation thermal resistance, improves the heat dissipation efficiency, has simple installation process, greatly reduces the installation and cost of the whole lamp and is convenient for large-scale automatic production.
Preferably, the COB substrate is a metal substrate or a ceramic substrate; the color excited by the LED chip is white light; the LED chip is a forward-mounted LED chip or a flip-chip LED blue light chip.
As shown in fig. 2, VIN of the low-voltage linear constant current chip 1 is connected to the positive electrode of the LED module 2, and supplies power to the low-voltage linear constant current chip 1 and generates a reference voltage, where the reference voltage is a fixed voltage source of 0.01V to 0.6V, and there are 1 to 3 reference voltages, and "reference voltage 1" > "reference voltage 2" > "reference voltage 3", and overvoltage protection and overtemperature protection are switches for selecting a reference voltage, for example, the voltage of "reference voltage 1" is 0.2V, the voltage of "reference voltage 2" is 0.1V, and the voltage of "reference voltage 3" is 0.05V. The logic functions of the operational amplifier OP and the MOS tube in the low-voltage linear constant-current chip 1 are that if the voltage of the positive electrode of the operational amplifier is greater than the voltage of the negative electrode, the voltage of the switch G of the MOS tube is increased, more current is passed, the voltage of two ends of the resistor is increased, the positive electrode of the resistor is connected with the negative electrode of the operational amplifier, if the voltage of the negative electrode of the operational amplifier is greater than the voltage of the positive electrode, the voltage of the switch G of the MOS tube is reduced, the current passing is reduced, and finally, the balance is achieved, namely, the voltage of the positive electrode of the. Then, in normal operation, the positive electrode of the operational amplifier is connected to "reference voltage 1" (0.2V), and if the resistance of the fixed resistor is 1 ohm, then 0.2V/1R is 200mA current. If the temperature is higher than a certain set value, the over-temperature protection closes the connection channel of the reference voltage 1, opens the reference voltage 2, and the anode of the operational amplifier is connected with the reference voltage 2 (0.1V), then 0.1V/1R is 100mA current, and similarly, the current of the over-temperature protection is 0.05V/1R is 50 mA.
Furthermore, a group of light-emitting modules can be packaged on the COB substrate, and a plurality of groups of light-emitting modules with different color temperatures can also be packaged on the COB substrate.
As shown in fig. 3, in the embodiment, two sets of light emitting modules with different color temperatures are packaged on the COB substrate 3. In practical application, the positive pad 33 of the COB substrate 3 is connected with the positive electrode of an external power supply, the negative pad 34 is connected with the negative electrode of the external power supply, two groups of LED modules are placed in the light emitting surface 31, the two low-voltage linear constant current chips 1 are connected in parallel, the positive pad 33 is connected with the LED modules and the low-voltage linear constant current chips 1 to provide logic power supply for the LED chips and the low-voltage linear constant current chips 1, the negative electrode of the LED modules is also connected with the low-voltage linear constant current chips 1, and the low-voltage linear constant current chips 1 control the current passing through the LED chips.
Correspondingly, the low-voltage linear constant current chip 1 is fixed on the pad of the COB substrate dam area 32 and covered by dam glue. During packaging, the low-voltage linear constant current chip 1 is firstly fixed on a bonding pad of the dam region 32, and after die bonding and wire bonding, the low-voltage linear constant current chip 1 is covered and protected by dam glue, so that a final product looks the same as a common COB light source.
Preferably, the light emitting surface 31 of the constant voltage driving COB light source is circular, and the shape of the light emitting surface 31 is more smooth, so that the user experience can be effectively improved.
As shown in fig. 4, the low-voltage linear constant current chip 1 is provided with the PWM port 11, so that the current of the LED module 2 can be easily controlled through the reserved PWM port 11, the dimming and color-adjusting functions can be freely realized, and the flexibility is strong.
Further, the low-voltage linear constant current chip 1 is provided with an overvoltage and overheating protection unit, when the constant-voltage driving LED chip is overheated and the input voltage is too high, the current can be reduced, the LED chip is prevented from being damaged, the reliability of the product can be effectively improved, the use environment of commercial lighting large-scale lamps is facilitated, and the market application range is wide.
From the above, the present invention has the following beneficial effects:
1. the low-voltage linear constant current chip is arranged in the constant voltage driving COB light source, a constant voltage power supply output by an external power supply can be converted into a constant current power supply through the low-voltage linear constant current chip, and the LED chip is driven in a low-voltage linear driving mode, so that the centralized use of the lamp is facilitated.
2. The overvoltage and overheating protection units are arranged on the low-voltage linear constant-current chip, so that the reliability of a product can be effectively improved, the use environment of commercial lighting large-scale lamps is facilitated, and the market application range is wide.
3. The low-voltage linear constant-current chip is provided with the PWM port, so that the dimming function can be easily realized, and the flexibility is strong.
4. The bare chip LED chip and the low-voltage linear constant-current chip are integrally packaged on the COB substrate in a bare chip mode, the systematic packaging of bare chips with various mixed wafer types is realized, the heat dissipation thermal resistance can be effectively reduced, the heat dissipation efficiency is improved, the mounting process is simple, the whole lamp mounting and cost are greatly reduced, and the large-scale automatic production is facilitated.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A constant voltage driving COB light source is characterized by comprising a COB substrate and at least one group of light emitting modules packaged on the COB substrate, wherein each light emitting module comprises an LED module and a low-voltage linear constant current chip which are in one-to-one correspondence;
the LED module comprises at least one LED chip, and the LED chip and the low-voltage linear constant-current chip are integrally packaged on the COB substrate in a bare die mode;
the anode of the LED module is connected with an external power supply, and the external power supply is used for providing a 12-42V low-voltage direct-current power supply for the LED chip;
the LED module is characterized in that the negative electrode of the LED module is connected with a low-voltage linear constant current chip in series, and the low-voltage linear constant current chip is used for converting a low-voltage direct current power supply output by the external power supply into a constant current power supply to drive the LED chip to work.
2. The constant voltage driving COB light source of claim 1, wherein the low-voltage linear constant current chip is fixed on a pad of a dam region of the COB substrate and covered by a dam paste.
3. The constant voltage driving COB light source of claim 1, wherein the COB substrate is a metal substrate or a ceramic substrate.
4. The constant voltage driving COB light source of claim 1, wherein the LED chip excited color is white light.
5. The constant voltage driving COB light source of claim 1, wherein the LED chip is a face-up LED chip or a flip-chip LED blue light chip.
6. The constant voltage driving COB light source of claim 1, wherein a set of light emitting modules is encapsulated on the COB substrate.
7. The constant voltage driving COB light source of claim 1, wherein a plurality of groups of light emitting modules with different color temperatures are packaged on the COB substrate.
8. The constant voltage driving COB light source of claim 1, wherein the low-voltage linear constant current chip is provided with an overvoltage and overheating protection unit.
9. The constant voltage driving COB light source of claim 1, wherein the low voltage linear constant current chip is provided with a PWM port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910805034.0A CN110671616A (en) | 2019-08-29 | 2019-08-29 | Constant voltage drive COB light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910805034.0A CN110671616A (en) | 2019-08-29 | 2019-08-29 | Constant voltage drive COB light source |
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| Publication Number | Publication Date |
|---|---|
| CN110671616A true CN110671616A (en) | 2020-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910805034.0A Pending CN110671616A (en) | 2019-08-29 | 2019-08-29 | Constant voltage drive COB light source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112923247A (en) * | 2021-02-24 | 2021-06-08 | 同辉电子科技股份有限公司 | Constant voltage drive COB light source |
| CN117082676A (en) * | 2023-10-16 | 2023-11-17 | 深圳市暗能量电源有限公司 | Packaging structure of linear constant current driving chip and preparation method thereof |
-
2019
- 2019-08-29 CN CN201910805034.0A patent/CN110671616A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112923247A (en) * | 2021-02-24 | 2021-06-08 | 同辉电子科技股份有限公司 | Constant voltage drive COB light source |
| CN117082676A (en) * | 2023-10-16 | 2023-11-17 | 深圳市暗能量电源有限公司 | Packaging structure of linear constant current driving chip and preparation method thereof |
| CN117082676B (en) * | 2023-10-16 | 2024-02-02 | 深圳市暗能量电源有限公司 | Packaging structure of linear constant current driving chip and preparation method thereof |
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