CN104918363A - LED constant current drive power supply and production method thereof - Google Patents
LED constant current drive power supply and production method thereof Download PDFInfo
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Abstract
The invention provides an LED constant current drive power supply which is in an integrally sealed structure. The LED constant current drive power supply comprises an input port, a first circuit board, a rectifying circuit, a linear constant current IC output circuit, a peripheral circuit of the linear constant current IC output circuit and an output port. The input port is connected with an alternating current power supply. The rectifying circuit and the linear constant current IC output circuit are packaged on the first circuit board through an on-board chip COB package technology. The linear constant current IC output circuit comprises at least one linear constant current IC chip. The peripheral circuit of the linear constant current IC output circuit comprises an adjusting resistor. The adjusting resistor is used for adjusting the output current of the linear constant current IC output circuit. According to the invention, the problems of large volume, high cost and poor water resistance, dust resistance, sealing and insulation of the existing LED drive power supply are solved.
Description
Technical field
The present invention relates to power-supply device field, be specifically related to a kind of LED constant current driving power and preparation method thereof.
Background technology
LED is as the emerging solid light source of the one greatly developed in recent years, and when its two ends adds forward voltage, the minority carrier in semiconductor and majority carrier generation compound, the excess energy of releasing will cause photo emissions.In recent years each major company and the research of research institution to LED in the ascendant, its light efficiency is greatly improved, and the light efficiency of LED is even higher up to 120lm on the market at present.
At present, be applicable to the driving power of indoor LED illumination light fixture, general volume is comparatively large, and cost is higher, and existing LED drive power waterproof and dustproof, sealing, insulation property are poor.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of LED constant current driving power and preparation method thereof, comparatively large to solve existing LED drive power volume, the problem of the higher and waterproof and dustproof of cost, sealing, insulation property difference.
For achieving the above object, the present invention is achieved by the following technical programs:
First aspect, the invention provides a kind of LED constant current driving power, described LED constant current driving power is integral seal structure, and described LED constant current driving power comprises input port, first circuit board, rectification circuit, linear constant current IC output circuit, the peripheral circuit of linear constant current IC output circuit and output port; Wherein, described input port is for connecting AC power; Described output port is for connecting LED array;
Described rectification circuit and described linear constant current IC output circuit are encapsulated on described first circuit board by chip on board COB packaging technology; Described linear constant current IC output circuit comprises at least one linear constant current IC chip; Described rectification circuit comprises several rectifier diodes;
The peripheral circuit of described linear constant current IC output circuit comprises regulating resistance, and described regulating resistance is for regulating the output current of described linear constant current IC output circuit.
Wherein, the peripheral circuit of described linear constant current IC output circuit also comprises protection electric capacity, and described protection electric capacity is for preventing the linear constant current IC chip in linear constant current IC output circuit described in high-voltage breakdown.
Wherein, described first circuit board is metal base circuit board or ceramic base material circuit board.
Wherein, when described first circuit board is metal substrate, the substrate portions of described linear constant current IC chip directly contacts with the first circuit board eliminating insulating barrier, and described linear constant current IC chip is dispelled the heat by described first circuit board, and the heat of described linear constant current IC chip is directly spread out of.
Second aspect, present invention also offers a kind of manufacture method of LED constant current driving power, comprising:
Chip on board COB packaging technology is adopted to be encapsulated on first circuit board by rectification circuit and linear constant current IC output circuit; Described linear constant current IC output circuit comprises at least one linear constant current IC chip; Described rectification circuit comprises several rectifier diodes;
Arrange regulating resistance in the extension of described linear constant current IC output circuit, described regulating resistance is for regulating the output current of described linear constant current IC output circuit;
Integral sealing encapsulation is carried out to described regulating resistance and described first circuit board.
Wherein, adopt COB packaging technology rectification circuit and linear constant current IC output circuit to be encapsulated on first circuit board to comprise:
Adopt COB technique, utilize the naked brilliant chip of rectifier diode to form rectification circuit on described first circuit board;
Adopt COB technique to be electrically connected by naked for linear constant current IC brilliant chip on described first circuit board, form linear constant current IC output circuit;
Described rectification circuit and described linear IC constant current output circuit are encapsulated.
Wherein, carry out encapsulation to described rectification circuit and described linear IC constant current output circuit to comprise:
Box dam process is carried out to described rectification circuit and described linear IC constant current output circuit, uses silica gel to carry out filling out envelope.
Wherein, before overall package is carried out to described regulating resistance and described first circuit board, also comprise:
Arrange protection electric capacity in the extension of described linear constant current IC output circuit, described protection electric capacity is for preventing the linear constant current IC chip in linear constant current IC output circuit described in high-voltage breakdown.
Wherein, carry out integral sealing encapsulation to described regulating resistance and described first circuit board to comprise:
Silicone adhesive is used to carry out integral sealing encapsulation to described regulating resistance and described first circuit board.
Wherein, when described first circuit board is metal substrate, the substrate portions of described linear constant current IC chip is directly contacted with the first circuit board eliminating insulating barrier, dispelled the heat by described first circuit board to enable described linear constant current IC chip.
Known by describing above, LED constant current driving power of the present invention, adopt chip on board (Chip On Board, being called for short COB) naked for rectifier diode chip crystalline substance and the naked crystalline substance of linear IC chip be encapsulated on described first circuit board by packaging technology, make whole LED constant current driving power volume can become very little, also make power supply cost reduce in addition to a certain extent, and the LED constant current driving power described in the embodiment of the present invention have good waterproof and dustproof, sealing and insulation property.
LED constant current driving power of the present invention and preparation method thereof, changes the output current of LED constant current driving power flexibly by the regulating resistance regulating the resistance of described regulating resistance or change different resistance.In addition, rectification circuit and linear constant current IC output circuit are sealed in separately on one piece of substrate by the present invention, rectifier diode in described rectification circuit and linear constant current IC output circuit and these devices of linear constant current IC chip can be sealed, to reach dust-proof, the object of waterproof and insulated electro performance, thus improve the useful life of these devices.Whole LED constant current power supply also seals by the present invention, to reach the problem of power source integral sealing, dust-proof, waterproof and insulated electro performance, improves the fail safe of LED constant current power supply.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 shows the structural representation of the LED constant current driving power that the embodiment of the present invention one provides;
Fig. 2 shows the circuit theory schematic diagram of the LED constant current driving power that the embodiment of the present invention one provides;
Fig. 3 shows the flow chart of the LED constant current driving power manufacture method that the embodiment of the present invention two provides;
Fig. 4 shows the circuit technology figure of LED constant current driving power;
Fig. 5 shows the circuit technology figure of another LED constant current driving power.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, clear, complete description is carried out to the technical scheme in the embodiment of the present invention, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
High-voltage linear driving IC chip only need be arranged in pairs or groups only a few passive component, does not need to use electrochemical capacitor and Inductive component.This mode significantly can not only reduce power supply cost, reduce power volume, and the life-span of product can be increased, main advantage in high-performance, high performance-price ratio, long-life, there is no electromagnetic interference, drive plate minimization, less part, simplicity of design, whole power unit cost 30%-40% lower than the switch mode power cost generally used now.Linear constant current driving power is with low cost due to it, conversion efficiency is high, without electromagnetic effect problems such as EMI, is subject to the very big welcome of lots of manufacturers, owing to which omits the large volume such as electrochemical capacitor, inductance and affecting the device of power source life, be greatly improved in its life-span.Moreover due to without large volume o components, linear IC paster and the components and parts around it can be mounted on one piece of aluminium base by producer, form current optoelectronic integration engine, greatly improve production efficiency and reduce the fraction defective of product.
The embodiment of the present invention have employed high-voltage linear IC chip exactly and constitutes linear constant current driving power.Particularly, Fig. 1 shows the structural representation of the LED constant current driving power that the embodiment of the present invention one provides.See Fig. 1, described LED constant current driving power comprises input port 1, first circuit board 2, rectification circuit 3, linear constant current IC output circuit 4, the peripheral circuit 5 of linear constant current IC output circuit and output port 6; Wherein, described input port 1 is for connecting AC power; Described output port 6 is for connecting LED array; Described rectification circuit 3 and described linear constant current IC output circuit 4 are encapsulated on described first circuit board 2 by chip on board (Chip On Board is called for short COB) packaging technology; Described linear constant current IC output circuit 4 comprises at least one linear constant current IC chip; Described rectification circuit 3 comprises several rectifier diodes; The peripheral circuit 5 of described linear constant current IC output circuit comprises regulating resistance 51, and described regulating resistance 51 is for regulating the output current of described linear constant current IC output circuit 4; Wherein, described LED constant current driving power is integral seal structure.
Fig. 2 shows the circuit theory schematic diagram of the LED constant current driving power that the embodiment of the present invention one provides.See Fig. 2, described LED constant current driving power comprises input port 1 (not shown), first circuit board 2 (not shown), rectification circuit 3 (the part that in figure, rectangle frame 3 marks, by four naked brilliant chip D1 of rectifier diode in Fig. 2, D2, D3, D4 constitutes rectification circuit), the linear constant current IC output circuit 4 (part that in figure, rectangle frame 4 marks, be made up of a naked brilliant chip U1 of linear constant current IC in Fig. 2), peripheral circuit 5 (the part that in figure, rectangle frame 5 marks of linear constant current IC output circuit, the peripheral circuit of Fig. 2 neutral line constant current IC output circuit comprises regulating resistance R1 and protection electric capacity C1, wherein protect below the effect of electric capacity C1 and can mention) and output port 6 (not shown).Described input port 1 connects the alternating current of 220V, and described output port connects LED array.
In an example of the embodiment of the present invention, the peripheral circuit 5 of described linear constant current IC output circuit also comprises protection electric capacity 52, and described protection electric capacity 52 is for preventing the linear constant current IC chip in linear constant current IC output circuit 4 described in high-voltage breakdown.
Wherein, described first circuit board 2 is metal base circuit board or ceramic base material circuit board.
In an example of the embodiment of the present invention, when described first circuit board 2 is metal base circuit board, the substrate portions of described linear constant current IC chip directly contacts with the first circuit board 1 eliminating insulating barrier, described linear constant current IC chip is dispelled the heat by described first circuit board, and the heat of described linear constant current IC chip is directly spread out of.
Wherein, for solving the heat dissipation problem of the naked crystalline substance of linear constant current IC chip as main heater members, when adopting metal base circuit board, adopt the cup aperture or counterbore technique of removing insulating barrier, by the substrate portions of the naked crystalline substance of linear constant current IC chip directly and the main base material close contact of metal base circuit board, the naked crystalline substance of linear constant current IC chip of the main heater members of LED drive power is enable to be delivered to metal base circuit board top fast, avoid the heat radiation that in common metal substrate circuit plate, insulating barrier part is brought to hinder, achieve thermoelectricity and be separated.
LED constant current driving power described in the embodiment of the present invention, adopt chip on board (Chip On Board, being called for short COB) naked for rectifier diode chip crystalline substance and the naked crystalline substance of linear IC chip be encapsulated on described first circuit board by packaging technology, make whole LED constant current driving power volume can become very little, also make power supply cost reduce in addition to a certain extent, and the LED constant current driving power described in the embodiment of the present invention have good waterproof and dustproof, sealing and insulation property.
LED constant current driving power described in the embodiment of the present invention, in the periphery of linear constant current IC output circuit, regulating resistance is set, by the output current regulating the number of the resistance of described regulating resistance or replacing regulating resistance or increase/minimizing regulating resistance to adjust LED constant current driving power, make the LED constant current driving power producing different size.In addition, rectification circuit and linear constant current IC output circuit are sealed in separately on one piece of substrate by the embodiment of the present invention, rectifier diode in described rectification circuit and linear constant current IC output circuit and these devices of linear constant current IC chip can be sealed, to reach dust-proof, the object of waterproof and insulated electro performance, thus improve the useful life of these devices.Whole LED constant current power supply also seals by the embodiment of the present invention, to reach the problem of power source integral sealing, dust-proof, waterproof and insulated electro performance, improves the safety and reliability of LED constant current power supply.
In addition, the embodiment of the present invention adopts the cup aperture or counterbore technique of removing insulating barrier, by the substrate portions of the naked crystalline substance of linear constant current IC chip directly and the main base material close contact of metal base circuit board, enable the naked crystalline substance of linear constant current IC chip of the main heater members of LED drive power be delivered to metal base circuit board top fast, avoid the heat radiation that in common metal substrate circuit plate, insulating barrier part is brought and hinder problem.
Fig. 3 shows the flow chart of the LED constant current driving power manufacture method that the embodiment of the present invention two provides, and see Fig. 3, the manufacture method of the LED constant current driving power that the embodiment of the present invention two provides comprises:
Step 101: adopt chip on board (Chip On Board is called for short COB) packaging technology to be encapsulated on first circuit board by rectification circuit and linear constant current IC output circuit; Described linear constant current IC output circuit comprises at least one linear constant current IC chip; Described rectification circuit comprises several rectifier diodes.
In this step, adopt COB packaging technology rectification circuit and linear constant current IC output circuit to be encapsulated on first circuit board to comprise:
Adopt COB technique, utilize the naked brilliant chip of rectifier diode to form rectification circuit on described first circuit board; Adopt COB technique to be electrically connected by naked for linear constant current IC brilliant chip on described first circuit board, form linear constant current IC output circuit; Described rectification circuit and described linear IC constant current output circuit are encapsulated.
Particularly, box dam process is carried out to described rectification circuit and described linear IC constant current output circuit, re-uses silica gel and carry out filling out envelope.
Wherein said first circuit board adopts metal base circuit board or ceramic base material circuit board.
Fig. 4 shows the circuit technology figure of LED constant current driving power, and as shown in Figure 4, rectification circuit 3 adopts four naked brilliant chip D1 of rectifier diode, D2, D3, D4 carry out electric property connection by COB packaging technology, and the alternating voltage of AC220V is produced high pressure low-frequency d voltage through rectifier bridge rectification.U1 is linear constant current IC output circuit part, and R1 is regulating resistance, and C1 is protection electric capacity.Wherein D1, D2, D3, D4 adopt the naked brilliant chip of rectifier diode, use the COB technique of beating gold thread and connecting, are combined into traditional full commutating phase bridge circuit, the 220V AC rectification of input is become direct voltage.U1 is the naked brilliant chip of linear constant current IC, when described first circuit board is metal substrate, the substrate portions of naked for described linear constant current IC brilliant chip is directly contacted with the first circuit board eliminating insulating barrier, is dispelled the heat by described first circuit board to enable described linear constant current IC chip.Particularly, adopt the cup aperture or counterbore technique of removing insulating barrier, main base material close contact that the is substrate portions of the naked crystalline substance of linear constant current IC chip is direct and metal base circuit board (illustrates in Fig. 4, IC substrate, counterbore is to main base material), be electrically connected by the gold thread mode of beating of COB technique, by D1, D2, D3, D4 and U1 beats after gold thread technique carries out, box dam process is carried out to this part, after box dam, use silica gel to carry out filling out envelope (to illustrate in Fig. 4, with box dam glue, envelope is filled out to first circuit board part), reach sealing, dust-proof, waterproof, the object of insulated electro performance.
Step 102: arrange regulating resistance in the extension of described linear constant current IC output circuit, described regulating resistance is for regulating the output current of described linear constant current IC output circuit.
In this step, the extension of described linear constant current IC output circuit is provided with regulating resistance, and described regulating resistance is preferably Chip-R, and described regulating resistance is the regulating resistance of output current, the electric current different according to different resistance regulation outputs.The number of regulating resistance is unrestricted, can arrange one or more according to actual needs.
Wherein, around the external packed part described in step 101 of regulating resistance, as the parts that can regulate at any time.
In addition, expansion of power supply power output can also be carried out by the number increasing linear constant current IC chip.
Therefore, by changing the resistance of regulating resistance and/or changing the number of linear constant current IC chip, make conventional light source encapsulate producer and can make the LED drive power of different size, and have High Power Factor, high efficiency, without EMI problem, low cost, life-span grow, the feature of insulation safety.
From the description of step 101-102, the naked crystalline substance of linear constant current IC chip and the naked brilliant chip of rectifier diode adopt COB packaging technology to carry out electric property connection, copper circuit or ceramic base material circuit board silver plated circuits and COB packaging technology is covered by metal base circuit board, integral device is used silica gel sealing except external regulating resistance, reaches the object of preventing dust oxidation.
Step 103: integral sealing encapsulation is carried out to described regulating resistance and described first circuit board.
In this step, silicone adhesive is used to carry out integral sealing encapsulation to described regulating resistance and described first circuit board.
After rectification circuit and described linear IC constant current output circuit are encapsulated into first circuit board and set the extension circuit of described linear constant current IC output circuit, envelope is filled out to described power source integral silicone adhesive, reaches the object of power source integral sealing, dust-proof, waterproof, insulated electro performance.
In an example of the present embodiment, before step 103 carries out overall package to described regulating resistance and described first circuit board, also comprise:
Arrange protection electric capacity in the extension of described linear constant current IC output circuit, described protection electric capacity is for preventing the linear constant current IC chip in linear constant current IC output circuit described in high-voltage breakdown.Described protection electric capacity is preferably patch capacitor, and it act as and prevents surge cushioning effect, avoids the naked crystalline substance of high-voltage breakdown linear constant current IC chip.
The same with regulating resistance, around the external packed part described in step 101 of described protection electric capacity, as the parts that can regulate or increase at any time.
In a preferred embodiment of the embodiment of the present invention, for realizing the object of power expansion, described linear constant current IC output circuit comprises multiple linear constant current IC chip, at this moment by naked for multiple linear constant current IC brilliant chip package on same substrate, to reach the object of power expansion.Fig. 5 shows the circuit technology figure of another LED constant current driving power of this embodiment, and as shown in Figure 5, linear constant current IC output circuit comprises two linear constant current IC chip U1 and U2, and wherein R1, R2 are regulating resistance, C1, C2 are protection electric capacity, D1, D2, D3, D4 adopts the naked brilliant chip of rectifier diode, use the COB technique of beating gold thread and connecting, be combined into traditional full commutating phase bridge circuit, transfer the 220V alternating current of input to direct voltage, U1, U2 is the naked brilliant chip of linear IC, IC substrate is put into above the master metal base material of counterbore when using metal substrate, be electrically connected by the gold thread mode of beating of COB technique, by D1, D2, D3, D4 and U1, U2 beats after gold thread technique carries out, box dam process is carried out to this part, after box dam, silica gel is used to carry out filling out envelope, reach sealing, dust-proof, waterproof, the object of insulated electro performance.The product of the corresponding different capacity of the different electric current of output of products is made by the resistance adjusting R1, R2.
The manufacture method of the LED constant current driving power described in the embodiment of the present invention, make the encapsulation enterprise of LED can carry out the production of LED drive power according to COB technique, and adopt thermoelectricity isolation technics, substrate portions by linear constant current IC chip directly contacts with the first circuit board eliminating insulating barrier, described linear constant current IC chip is dispelled the heat by described first circuit board, the heat of described linear constant current IC chip can directly spread out of, the heat radiation avoiding the insulating barrier in usual manner on first circuit board Copper Foil conductive layer to bring hinders problem, and heat and electricity are effectively separated.Outer being equipped with protects electric capacity and output current regulatory function in addition, and adopts COB packaging technology, and the safety and reliability of LED constant current driving power can be effectively guaranteed.
The embodiment of the present invention thoroughly utilizes LED COB packaging technology; adopt the naked crystalline substance of rectifier diode chip and the naked crystalline substance of linear IC chip; use the die bond in COB technique, beat gold thread technique; the LED drive power just can produced in composition conventional power source enterprise; leave the pad locations of protection electric capacity and regulating resistance simultaneously; make producer can regulation output electric current as required, protection electric capacity avoids the high-voltage breakdown of product in use linear IC.Due to the large volume o components such as LED constant current driving power no electrolytic capacitor and power inductance made, size can be accomplished very small and exquisite.In addition, the LED constant current driving power made have High Power Factor, high efficiency, without features such as EMI problems.
Above embodiment only for illustration of technical scheme of the present invention, is not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a LED constant current driving power, it is characterized in that, described LED constant current driving power is integral seal structure, and described LED constant current driving power comprises input port, first circuit board, rectification circuit, linear constant current IC output circuit, the peripheral circuit of linear constant current IC output circuit and output port; Wherein, described input port is for connecting AC power; Described output port is for connecting LED array;
Described rectification circuit and described linear constant current IC output circuit are encapsulated on described first circuit board by chip on board COB packaging technology; Described linear constant current IC output circuit comprises at least one linear constant current IC chip; Described rectification circuit comprises several rectifier diodes;
The peripheral circuit of described linear constant current IC output circuit comprises regulating resistance, and described regulating resistance is for regulating the output current of described linear constant current IC output circuit.
2. LED constant current driving power according to claim 1; it is characterized in that; the peripheral circuit of described linear constant current IC output circuit also comprises protection electric capacity, and described protection electric capacity is for preventing the linear constant current IC chip in linear constant current IC output circuit described in high-voltage breakdown.
3. LED constant current driving power according to claim 1, is characterized in that, described first circuit board is metal base circuit board or ceramic base material circuit board.
4. LED constant current driving power according to claim 1, it is characterized in that, when described first circuit board is metal substrate, the substrate portions of described linear constant current IC chip directly contacts with the first circuit board eliminating insulating barrier, described linear constant current IC chip is dispelled the heat by described first circuit board, and the heat of described linear constant current IC chip is directly spread out of.
5. a manufacture method for LED constant current driving power, is characterized in that, comprising:
Chip on board COB packaging technology is adopted to be encapsulated on first circuit board by rectification circuit and linear constant current IC output circuit; Described linear constant current IC output circuit comprises at least one linear constant current IC chip; Described rectification circuit comprises several rectifier diodes;
Arrange regulating resistance in the extension of described linear constant current IC output circuit, described regulating resistance is for regulating the output current of described linear constant current IC output circuit;
Integral sealing encapsulation is carried out to described regulating resistance and described first circuit board.
6. the manufacture method of LED constant current driving power according to claim 5, is characterized in that, adopts COB packaging technology rectification circuit and linear constant current IC output circuit to be encapsulated on first circuit board and comprises:
Adopt COB technique, utilize the naked brilliant chip of rectifier diode to form rectification circuit on described first circuit board;
Adopt COB technique to be electrically connected by naked for linear constant current IC brilliant chip on described first circuit board, form linear constant current IC output circuit;
Described rectification circuit and described linear IC constant current output circuit are encapsulated.
7. the manufacture method of LED constant current driving power according to claim 6, is characterized in that, carries out encapsulation comprise described rectification circuit and described linear IC constant current output circuit:
Box dam process is carried out to described rectification circuit and described linear IC constant current output circuit, uses silica gel to carry out filling out envelope.
8. the manufacture method of LED constant current driving power according to claim 5, is characterized in that, before carrying out overall package to described regulating resistance and described first circuit board, also comprises:
Arrange protection electric capacity in the extension of described linear constant current IC output circuit, described protection electric capacity is for preventing the linear constant current IC chip in linear constant current IC output circuit described in high-voltage breakdown.
9. the manufacture method of LED constant current driving power according to claim 5, is characterized in that, carries out integral sealing encapsulation comprise described regulating resistance and described first circuit board:
Silicone adhesive is used to carry out integral sealing encapsulation to described regulating resistance and described first circuit board.
10. the manufacture method of LED constant current driving power according to claim 6, it is characterized in that, when described first circuit board is metal substrate, the substrate portions of described linear constant current IC chip is directly contacted with the first circuit board eliminating insulating barrier, is dispelled the heat by described first circuit board to enable described linear constant current IC chip.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN108366462B (en) * | 2018-04-20 | 2020-08-21 | 上海路傲电子科技有限公司 | Linear constant-current driving chip and multi-chip parallel LED lighting circuit |
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