CN209105488U - A kind of conductive silver paste printing composite line substrate and LED illumination mould group - Google Patents
A kind of conductive silver paste printing composite line substrate and LED illumination mould group Download PDFInfo
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- CN209105488U CN209105488U CN201821340978.2U CN201821340978U CN209105488U CN 209105488 U CN209105488 U CN 209105488U CN 201821340978 U CN201821340978 U CN 201821340978U CN 209105488 U CN209105488 U CN 209105488U
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Abstract
The utility model discloses a kind of conductive silver paste printing composite line substrate and LED illumination mould groups, the conductive silver paste printing composite line substrate is made of metal plate, insulation board, the first silver paste pad and copper foil circuit, structure is simple, the substrate no longer needs to carry out route the surface treatment such as spray tin, turmeric, the chemical shock of substrate is generated so as to avoid high temperature thermal shocking negative effect and chemical medicinal liquid to baseplate material, energy conservation and environmental protection, while the size and position precision that pad improves pad are printed using steel mesh.The LED illumination mould group uses the constant current driver circuit for LED with filter module, rectifier bridge, primary clamping protection module, current output module, primary feedback control module, time delay module, current sampling module and buffer module to drive LED simultaneously; circuit structure is simple; effective protection LED element extends the service life of LED element.
Description
Technical field
The utility model relates to pcb board technical field of heat dissipation more particularly to a kind of conductive silver paste to print composite line substrate
And LED illumination mould group.
Background technique
As electronics and industrial products are to miniaturization and centralization development, LED substrate it is high-power miniaturized also increasingly by
Favor, and minimize to the route on the thermally conductive of substrate, heat dissipation and substrate, the required precision of pad is higher, especially flip LED
Product reaches ± 0.05mm to the required precision of pad size, this brings certain difficulty to LED substrate production.LED is as illumination
The light source of electric appliance, when work, need constant current, it is therefore desirable to special driving circuit, currently, LED drive circuit is all made of perseverance
Driving method is flowed, the electric current for flowing through LED when voltage, temperature change is avoided to change the case where causing LED to damage, it is still, existing
Some constant current driver circuit for LED are most of, and structure is complicated, and lacks overvoltage crowbar, if the voltage of output is beyond requirement
Specification then easily damages LED, influences the using effect and service life of LED display panel.Meanwhile with social development, people
Growing to good life needs, environmental consciousness is increasingly enhanced, so state and society proposes more the environmental protection of LED substrate
Harsh requirement.And existing LED substrate structure complexity leads to the presence of serious problem of environmental pollution in the fabrication process to the greatest extent.
Utility model content
The utility model is based on problem above, provides a kind of conductive silver paste printing composite line substrate and LED illumination mould group
To solve the problems, such as that existing LED substrate structure is complicated, LED drive circuit is complicated.
On the one hand, the utility model discloses a kind of conductive silver pastes to print composite line substrate, comprising: metal plate, insulation
Plate, the first silver paste pad and copper foil circuit；The insulation board is provided with the first contact surface and the second contact surface, first contact
Face is oppositely arranged with second contact surface, and the metal plate is abutted with first contact surface, the copper foil circuit with it is described
Second contact surface abuts, and the first silver paste pad is connect with the copper foil circuit.
Preferably, the first silver paste pad is abutted with second contact surface, the first silver paste pad and the copper
Tinsel cord road is arranged in parallel.
Preferably, the conductive silver paste prints composite line substrate further include: the second silver paste pad, the second silver paste weldering
One side of the disk with the copper foil circuit away from the insulation board abuts, between the first silver paste pad and the second silver paste pad
Every setting.
On the other hand, the invention also discloses a kind of LED illumination mould groups, comprising: conductive silver paste prints composite line
Substrate and the constant current driver circuit for LED being arranged on the conductive silver paste printing composite line substrate, wherein the conductive silver paste
Printing composite line substrate is that conductive silver paste described in any of the above item prints composite line substrate.
Preferably, the constant current driver circuit for LED includes: filter module, rectifier bridge, primary clamping protection module, electric current
Output module, primary feedback control module, time delay module, current sampling module and buffer module；The filter module will be described
The electric current of rectifier bridge input inputs the primary clamping protection module, the primary clamping protection module root after being filtered
According to the signal output constant current current signal of the received primary feedback control module to the current output module；The primary
Feedback control module compares output according to the electric current of current output module feedback and the electric current of current sampling module acquisition
Current signal is to the primary clamping protection module, and the current sampling module is by the electric current of the cache module of acquisition through prolonging
When the module input primary clamping protection module.
Preferably, the filter module includes: the first inductance, first resistor, first capacitor and the second capacitor；Described first
The first end of resistance is connect with the rectifier bridge input terminal, the second end of the first resistor and the primary clamp protection circuits
Connection；The first resistor and first inductance in parallel；The first of the first end of the first capacitor and the first resistor
End electrical connection, the second end ground connection of the first capacitor；The first end of second capacitor and the second end of the first resistor
Electrical connection, the second end ground connection of second capacitor.
Preferably, the primary clamp protection circuits include second resistance, 3rd resistor, third capacitor, the 4th resistance, the
Five resistance and first diode；The first end of the second resistance is electrically connected with the second end of the first resistor, and described second
The second end of resistance is connect with the first end of the 3rd resistor, the 3rd resistor second end and the primary feedback control mould
Block connection；The first end of the third capacitor is connect with the first end of the second resistance, the second end of the third capacitor with
The first end of 5th resistance connects, and the 4th resistance is in parallel with the third capacitor, the first end of the 4th resistance
It is connect with the current output module, the second end of the 4th capacitor is connect with the first end of the 5th resistance；Described
The second end of five resistance is electrically connected with the cathode of the first diode, anode and the buffer module of the first diode
And the current output module connection.
Preferably, the buffer module includes: first switch tube, the 6th resistance, the 7th resistance and the 9th capacitor；Described
The first end of one switching tube is electrically connected with the anode of the first diode, the second end of the first switch tube and the electric current
Sampling module connection, the first of the first end and the 7th resistance of the third end of the first switch tube and the 6th resistance
End connection；The second end of 6th resistance connect with the primary feedback control module, the second end of the 7th resistance and
The current sampling module and time delay module connection；9th capacitor is in parallel with the first switch tube.
Preferably, the delay circuit includes: the 8th resistance and the 4th capacitor；The first end of 8th resistance with it is described
The second end of 7th resistance and current sampling module connection, the of the second end of the 8th resistance and the 4th capacitor
One end and the primary feedback control module connection；The first end of 4th capacitor and the primary feedback control module connect
It connects, the second end ground connection of the 4th capacitor.
Preferably, the current sampling module includes the 9th resistance and the tenth resistance；The first end of 9th resistance with
The second end of the first switch tube and the connection of the first end of the 8th resistance, the second end ground connection of the 9th resistance；Institute
The tenth resistance and the 9th resistor coupled in parallel are stated, the first end of the tenth resistance and the first end of the 8th resistance are electrically connected
It connects, the second end ground connection of the tenth resistance.
In conclusion the conductive silver paste printing composite line substrate and LED illumination mould group of the utility model, the conductive silver
Slurry printing composite line substrate is made of metal plate, insulation board, the first silver paste pad and copper foil circuit, and structure is simple, the substrate
It no longer needs to carry out route the surface treatment such as spray tin, turmeric, the negative effect for generating substrate so as to avoid high temperature thermal shocking
And chemical medicinal liquid is to the chemical shock of baseplate material, energy conservation and environmental protection, while the size of pad is improved using steel mesh printing pad
And position precision.The LED illumination mould group uses defeated with filter module, rectifier bridge, primary clamping protection module, electric current simultaneously
The constant current driver circuit for LED driving of module, primary feedback control module, time delay module, current sampling module and buffer module out
LED, circuit structure is simple, and effective protection LED element extends the service life of LED element.
Detailed description of the invention
Fig. 1 is that the conductive silver paste of the utility model prints the structural schematic diagram of composite line substrate.
Fig. 2 is the schematic diagram of the constant current driver circuit for LED of the utility model.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the utility model, it should be noted that
Under the premise of not colliding, it can be formed in any combination between various embodiments described below or between each technical characteristic new
Embodiment.
Referring to Fig. 1, the utility model discloses a kind of conductive silver pastes to print composite line substrate, comprising: metal plate 11,
Insulation board 12, the first silver paste pad 14 and copper foil circuit 13；The insulation board 12 is provided with the first contact surface 121 and the second contact
Face 122, the metal plate 11 are abutted with first contact surface 121, and the copper foil circuit 13 is supported with second contact surface 122
It connects, the first silver paste pad 14 is connect with the copper foil circuit 13.The conductive silver paste printing composite line substrate is to pass through
The metal plate 11 and insulation board 12 and the pressing of 13 stack of copper foil circuit are made, the metal plate 11, insulation board 12 and copper foil
Route 13 fits closely, and the copper foil circuit 13 is made up of etching technique, and first pad is printed on described by silver paste
On insulation board 12, silver paste has low square resistance, high thermal conductivity using the conductive silver paste that weldability is good, adhesive force is strong, this kind of silver paste
Coefficient.Wherein, the metal plate 11 can be aluminium sheet, copper sheet is also possible to metal alloy plate, the specific material of the metal plate 11
Matter is it is not limited here.The first silver paste pad 14, which can be set, also can be set on copper foil circuit 13 in insulation board 12
On, the specific location of the first silver paste pad 14 is not specifically limited herein.
Preferably, in one embodiment, the first silver paste pad 14 is abutted with second contact surface 122, and described
One silver paste pad 14 is arranged in parallel with the copper foil circuit 13.
In another embodiment, the conductive silver paste prints composite line substrate further include: the second silver paste pad 15, it is described
Second silver paste pad 15 and the copper foil circuit 13 are abutted away from the one side of the insulation board 12, the first silver paste pad 14 and
The interval of second silver paste pad 15 setting.
The invention also discloses a kind of LED illumination mould groups, comprising: conductive silver paste prints composite line substrate and setting
Constant current driver circuit for LED on conductive silver paste printing composite line substrate, wherein the conductive silver paste prints recombination line
Base board is that conductive silver paste described in any of the above embodiment prints composite line substrate.
Referring to Fig. 2, the constant current driver circuit for LED includes: filter module 10, rectifier bridge 20, primary clamping protection mould
Block 30, current output module 40, primary feedback control module 50, time delay module 60, current sampling module 70 and buffer module 80；
The filter module 10 inputs the primary clamping protection module after being filtered the electric current that the rectifier bridge 20 inputs
30, the signal output constant current electric current letter of the primary clamping protection module 30 primary feedback control module 50 based on the received
Number to the current output module 40；The electric current that the primary feedback control module 50 feed back according to current output module 40 with
The electric current that the current sampling module 70 acquires compares output current signal to the primary clamping protection module 30, the electric current
The electric current of the cache module of acquisition is inputted the primary clamping protection module 30 through time delay module 60 by sampling module 70.Institute
Constant current driver circuit for LED is stated to simplify circuit structure only with a primary feedback control module 50 while still having good
Constant-current characteristics.
Preferably, the filter module 10 includes: the first inductance L1, first resistor R1, first capacitor C1 and the second capacitor
C2；The first inductance L1, the first resistor R1, the first capacitor C1 and the second capacitor C2 form π type filtered electrical
Road；The first end of the first resistor R1 is connect with 20 input terminal of rectifier bridge, the second end of the first resistor R1 and institute
State primary clamp protection circuits connection；The first resistor R1 is in parallel with the first inductance L1；The of the first capacitor C1
One end is electrically connected with the first end of the first resistor R1, the second end ground connection of the first capacitor C1；The second capacitor C2
First end be electrically connected with the second end of the first resistor R1, the second end of the second capacitor C2 ground connection.
Preferably, the primary clamping protection module 30 includes second resistance R2,3rd resistor R3, third capacitor C3, the
Four resistance R4, the 5th resistance R5 and first diode D1；The of the first end of the second resistance R2 and the first resistor R1
The electrical connection of two ends, the second end of the second resistance R2 are connect with the first end of the 3rd resistor R3, the 3rd resistor R3
Second end is connect with the primary feedback control module 50；The of the first end of the third capacitor C3 and the second resistance R2
One end connection, the second end of the third capacitor C3 connect with the first end of the 5th resistance R5, the 4th resistance R4 and
The third capacitor C3 is in parallel, and the first end of the 4th resistance R4 is connect with the current output module 40, the 4th electricity
The second end for holding C4 is connect with the first end of the 5th resistance R5；The second end of the 5th resistance R5 and the one or two pole
The cathode of pipe D1 is electrically connected, and anode and the buffer module 80 and the current output module 40 of the first diode D1 connects
It connects.The primary clamp protection circuits absorb leakage inductance peak voltage protective switch pipe, and the 5th resistance R5 can reduce temperature rise, improve
Inhibit high frequency ringing and inhibits the ability of system electromagnetic interference.Wherein, the resistance value of the 5th resistance R5 is less than 100 Ω.
Preferably, the buffer module 80 includes: first switch tube Q1, the 6th resistance R6, the electricity of the 7th resistance R7 and the 9th
Hold C9；The first end of the first switch tube Q1 is connect with the anode of the first diode D1, the first switch tube Q1's
Second end is connect with the current sampling module 70, the third end of the first switch tube Q1 and the first of the 6th resistance R6
The connection of the first end of end and the 7th resistance R7；The second end of the 6th resistance R6 and the primary feedback control module 50
Connection, the second end of the 7th resistance R7 are connect with the current sampling module 70 and the time delay module 60；Described 9th
Capacitor C9 is in parallel with the first switch tube Q1, in the both ends the first switch tube Q1 the 9th capacitor C9 in parallel, can both delay
The shutdown of the first switch tube Q1 is rushed to reduce turn-off power loss, while resonance can also be formed with primary inductance and helped
The recovery of magnetic core of transformer.
Preferably, the time delay module 60 includes: the 8th resistance R8 and the 4th capacitor C4；The first of the 8th resistance R8
End is connect with the second end of the 7th resistance R7 and the current sampling module 70, the second end of the 8th resistance R8 and institute
The first end and the primary feedback control module 50 for stating the 4th capacitor C4 connect；The first end of the 4th capacitor C4 with it is described
Primary feedback control module 50 connects, the second end ground connection of the 4th capacitor C4.In the present embodiment, the 8th resistance R8
For weakening the first switch tube Q1 in switching process to the current spike of current sampling module 70.
Preferably, the current sampling module 70 includes the 9th resistance R9 and the tenth resistance R10；The 9th resistance R9's
First end is connect with the first end of the second end of the first switch tube Q1 and the 8th resistance R8, the 9th resistance R9's
Second end ground connection；The tenth resistance R10 is in parallel with the 9th resistance R9, the first end of the tenth resistance R10 with it is described
The first end of 8th resistance R8 is electrically connected, the second end ground connection of the tenth resistance R10.
Preferably, the primary feedback control module 50 includes processor U1, the 5th capacitor C5, the 6th capacitor C6, the 7th
Capacitor C7, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, the 14th resistance R14, the second diode D2,
First transformer T2 and the tenth capacitor；The first pin OUT of the processor U1 is connect with the second end of the 6th resistance R6,
The second pin Isense of the processor U1 and the second end of the 8th resistance R8 and the first end of the 4th capacitor C4
Connection, the third pin GND pin ground connection of the processor U1, the 4th pin Vcc and the described 11st of the processor U1
The first end of resistance R11 connects, the first end of the 5th pin Vsense and the 5th capacitor C5 of the processor U1, described
The second end of thirteenth resistor R13 and the connection of the first end of the 14th resistance R14；The 6th pin of the processor U1
Vin is connect with the second end of the first end of the 6th capacitor C6 and the 3rd resistor R3；The 4th of the processor U1 draws
Foot Vcc pin is connect with the second end of the first end of the 7th capacitor C7 and the twelfth resistor R12；12nd electricity
The first end of resistance R12 is connect with the cathode of the second diode D2；The second end of the twelfth resistor R12 and the described 7th
The first end of capacitor C7 connects；The first end of the thirteenth resistor R13 and the anode and electric current of the second diode D2 are defeated
Module 40 connects out；The second end of the thirteenth resistor R13 is connect with the first end of the 14th resistance R14；Described
The first end of ten capacitors is connect with the current output module 40；The second end of the eleventh resistor R11, the 5th capacitor
The second end of C5, the second end of the 6th capacitor C6, the second end of the 7th capacitor C7, the second end of the tenth capacitor
And the second end electrical connection of the 14th resistance R14.The 5th pin Vsense of the processor U1 is auxiliary voltage induced,
By obtaining auxiliary polygonal voltage signal after the thirteenth resistor R13 and the 14th resistance R14 partial pressure: the processor U1's
5th pin Vsenseo detects voltage change, if there is error just by the first pin OUT adjustment described the of the processor U1
The duty ratio of one switching tube Q1 controls the energy transmission of the first transformer T2, with the constant of maintenance voltage.The processor
The second pin Isense of U1 is primary current induction, is periodically detected peak primary currents.By the 9th resistance R9 and institute
The voltage on the tenth resistance R10 is stated compared with chip interior reference voltage.Once there is error, the processor U1 will be adjusted
The duty ratio of the first switch tube Q1, with the constant of maintenance voltage.Wherein, the 9th resistance R9 and the tenth resistance
R10 is the precision resister of 1% error.
Preferably, the current output module 40 includes the second transformer T2, third diode D3, the 8th capacitor C8 and the
15 resistance R15；One end of the second transformer T2 is connect with the first end of the 4th resistance R4；Second transformer
The other end of T2 is connect with the anode of the third diode D3；The cathode and the 8th capacitor C8 of the third diode D3
First end connection, the second end of the 8th capacitor C8 connect with the second transformer T2；The 15th resistance R15 with
The 8th capacitor C8 is in parallel.
In conclusion the conductive silver paste printing composite line substrate and LED illumination mould group of the utility model, the conductive silver
Slurry printing composite line substrate is made of metal plate 11, insulation board 12, the first silver paste pad 14 and copper foil circuit 13, structure letter
Single, which no longer needs to carry out route the surface treatment such as spray tin, turmeric, generates so as to avoid high temperature thermal shocking to substrate
The chemical shock of negative effect and chemical medicinal liquid to baseplate material, energy conservation and environmental protection, while weldering is improved using steel mesh printing pad
The size and position precision of disk.The LED illumination mould group is used simultaneously protects with filter module 10, rectifier bridge 20, primary clamp
Protect module 30, current output module 40, primary feedback control module 50, time delay module 60, current sampling module 70 and buffering mould
The constant current driver circuit for LED of block 80 drives LED, and circuit structure is simple, effective protection LED element, and extend LED element uses the longevity
Life.
Above embodiment is only preferred embodiments of the present invention, cannot be protected with this to limit the utility model
Range, the variation of any unsubstantiality that those skilled in the art is done on the basis of the utility model and replacement belong to
In the utility model range claimed.
Claims (10)
1. a kind of conductive silver paste prints composite line substrate characterized by comprising metal plate, insulation board, the first silver paste pad
And copper foil circuit；The insulation board is provided with the first contact surface and the second contact surface, and first contact surface connects with described second
Contacting surface is oppositely arranged, and the metal plate is abutted with first contact surface, and the copper foil circuit is abutted with second contact surface,
The first silver paste pad is connect with the copper foil circuit.
2. conductive silver paste according to claim 1 prints composite line substrate, which is characterized in that the first silver paste pad
It is abutted with second contact surface, the first silver paste pad is arranged in parallel with the copper foil circuit.
3. conductive silver paste according to claim 2 prints composite line substrate, which is characterized in that the conductive silver paste printing
Composite line substrate further include: the second silver paste pad, the second silver paste pad and the copper foil circuit deviate from the insulation board
One side abut, the first silver paste pad and the second silver paste pad interval are arranged.
4. a kind of LED illumination mould group characterized by comprising conductive silver paste printing composite line substrate and setting are led described
Constant current driver circuit for LED on electric silver paste printing composite line substrate, wherein conductive silver paste printing composite line substrate is
The described in any item conductive silver pastes of claims 1 to 3 print composite line substrate.
5. LED illumination mould group according to claim 4, which is characterized in that the constant current driver circuit for LED includes: filtering
Module, rectifier bridge, primary clamping protection module, current output module, primary feedback control module, time delay module, current sample
Module and buffer module；The filter module inputs the primary pincers after being filtered the electric current that the rectifier bridge inputs
Position protective module, the signal output constant current electricity of the primary clamping protection module primary feedback control module based on the received
Signal is flowed to the current output module；Electric current and described of the primary feedback control module according to current output module feedback
The electric current of current sampling module acquisition compares output current signal to the primary clamping protection module, the current sampling module
The electric current of the buffer module of acquisition is inputted into the primary clamping protection module through time delay module.
6. LED illumination mould group according to claim 5, which is characterized in that the filter module includes: the first inductance,
One resistance, first capacitor and the second capacitor；The first end of the first resistor is connect with the rectifier bridge input terminal, and described first
The second end of resistance is connect with the primary clamp protection circuits；
The first resistor and first inductance in parallel；The first end of the first end of the first capacitor and the first resistor
Electrical connection, the second end ground connection of the first capacitor；The first end of second capacitor and the second end electricity of the first resistor
Connection, the second end ground connection of second capacitor.
7. LED illumination mould group according to claim 6, which is characterized in that the primary clamping protection module includes second
Resistance, 3rd resistor, third capacitor, the 4th resistance, the 5th resistance and first diode；The first end of the second resistance and institute
The second end electrical connection of first resistor is stated, the second end of the second resistance is connect with the first end of the 3rd resistor, described
3rd resistor second end is connect with the primary feedback control module；The first end of the third capacitor and the second resistance
First end connection, the second end of the third capacitor connect with the first end of the 5th resistance, the 4th resistance with it is described
Third capacitor is in parallel, and the first end of the 4th resistance is connect with the current output module, the second end of the 4th resistance
It is connect with the first end of the 5th resistance；The second end of 5th resistance is electrically connected with the cathode of the first diode,
The anode of the first diode is connect with the buffer module and the current output module.
8. LED illumination mould group according to claim 7, which is characterized in that the buffer module include: first switch tube,
6th resistance, the 7th resistance and the 9th capacitor；The first end of the first switch tube and the anode of the first diode are electrically connected
Connect, the second end of the first switch tube is connect with the current sampling module, the third end of the first switch tube with it is described
The first end of 6th resistance and the connection of the first end of the 7th resistance；The second end of 6th resistance and the primary feedback
Control module connection, the second end of the 7th resistance are connect with the current sampling module and the time delay module；Described
Nine capacitors are in parallel with the first switch tube.
9. LED illumination mould group according to claim 8, which is characterized in that the time delay module includes: the 8th resistance and
Four capacitors；The first end of 8th resistance is connect with the second end of the 7th resistance and the current sampling module, described
The second end of 8th resistance is connect with the first end of the 4th capacitor and the primary feedback control module；4th capacitor
First end connect with the primary feedback control module, the second end of the 4th capacitor is grounded.
10. LED illumination mould group according to claim 9, which is characterized in that the current sampling module includes the 9th resistance
And the tenth resistance；The first end of the first end of 9th resistance and the second end of the first switch tube and the 8th resistance
Connection, the second end ground connection of the 9th resistance；Tenth resistance and the 9th resistor coupled in parallel, the of the tenth resistance
One end is electrically connected with the first end of the 8th resistance, the second end ground connection of the tenth resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821340978.2U CN209105488U (en) | 2018-08-20 | 2018-08-20 | A kind of conductive silver paste printing composite line substrate and LED illumination mould group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821340978.2U CN209105488U (en) | 2018-08-20 | 2018-08-20 | A kind of conductive silver paste printing composite line substrate and LED illumination mould group |
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| CN209105488U true CN209105488U (en) | 2019-07-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111025792A (en) * | 2019-12-20 | 2020-04-17 | 章思 | Liquid crystal film structure and processing method |
| CN112435929A (en) * | 2019-08-26 | 2021-03-02 | 珠海零边界集成电路有限公司 | Power module packaging method and power module |
-
2018
- 2018-08-20 CN CN201821340978.2U patent/CN209105488U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112435929A (en) * | 2019-08-26 | 2021-03-02 | 珠海零边界集成电路有限公司 | Power module packaging method and power module |
| CN112435929B (en) * | 2019-08-26 | 2024-05-28 | 珠海零边界集成电路有限公司 | Packaging method of power module and power module |
| CN111025792A (en) * | 2019-12-20 | 2020-04-17 | 章思 | Liquid crystal film structure and processing method |
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