CN208029159U - A kind of LED drive system - Google Patents
A kind of LED drive system Download PDFInfo
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- CN208029159U CN208029159U CN201820604872.2U CN201820604872U CN208029159U CN 208029159 U CN208029159 U CN 208029159U CN 201820604872 U CN201820604872 U CN 201820604872U CN 208029159 U CN208029159 U CN 208029159U
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Abstract
The utility model discloses a kind of LED drive systems, including power module, LED driving adjustment module, LED controls switch, soft-start module, LED module.Power module, LED module, LED control switches are sequentially connected.The input terminal of LED module drives the voltage sample input terminal of adjustment module to be connected with LED.The output end of LED control switches drives the current sample input terminal of adjustment module to be connected with LED.The output end of LED driving adjustment modules is connected with the control signal of LED control switches.The output end of power module is connected with the input terminal of soft-start module.The output end of soft-start module is connected with the control signal of LED control switches.Soft-start module is used to carry out soft start to LED module.Soft-start module makes LED module be connected in the zero crossing of alternating current, avoids causing heavy current impact to LED module.
Description
Technical field
The utility model is related to electronic technology field more particularly to a kind of LED drive systems.
Background technology
LED (LightEmittingDiode, light emitting diode) is using semi-conducting material as electrical-optical conversion medium
Light source of new generation, have the characteristics that energy-saving and environmental protection, long lifespan, small, mainstream photograph will be become substituting energy-saving lamp soon
It is bright.Prohibit pin policy with global incandescent lamp cut-off sequentially to implement, LED illumination lamp will be in face of the opportunity of substitution incandescent lamp, market
Scale is up to hundreds billion of.
However, existing LED drive system, has deficiency below：
(1) most of existing LED drive system do not have soft start-up scheme, but directly to the LED light in LED lamp into
Row driving causes the electric current moment for flowing through LED light to increase, is impacted very greatly to LED light itself, and be easy to cause LED light uses the longevity
Life shortens, or even damage LED light, i.e. safety be not high.
(2) existing LED drive system can only operate under fixed power, can not be adjusted according to the environment of surrounding
It is whole, it is prolonged that high-power operation is kept to cause prodigious energy waste.
Utility model content
In view of the deficiencies of the prior art, the utility model proposes a kind of LED drive systems.
To achieve the goals above, technical solutions of the utility model are as follows：
A kind of LED drive system, including power module, LED driving adjustment module, LED control switch, soft-start module,
LED module.Power module, LED module, LED control switches are sequentially connected.The input terminal of LED module drives adjustment module with LED
Voltage sample input terminal be connected.The output end of LED control switches drives the current sample input terminal phase of adjustment module with LED
Connection.The output end of LED driving adjustment modules is connected with the control signal of LED control switches.The output end of power module
It is connected with the input terminal of soft-start module.The output end of soft-start module is connected with the control signal of LED control switches.
LED drives adjustment module to control the control signal that LED controls switch by pwm pulse signal；Also, LED drivings adjust mould
Block samples the voltage and current of LED module, and controls LED and switch according to voltage sample value, current sampling data respectively
Control signal carry out voltage pwm adjusting, electric current PWM is adjusted.Soft-start module is used to carry out soft start to LED module.
Further, further include LED power control module.The output end of LED power control module adjusts mould with LED drivings
The current sample input terminal of block is connected.LED power control module changes LED drivings according to the power adjustment signal of input and adjusts
The current sampling data of the current sample input terminal of module drives the electric current PWM of adjustment module to adjust to adjust LED moulds using LED
The power of group.
Further, power module includes fuse F1, capacitance Cx, varistor MOV, full-wave rectification bridge D1, capacitance Ch.It is molten
Silk F1 is connected on the electrode input end of full-wave rectification bridge D1；Capacitance Cx, varistor MOV are being connected across full-wave rectification bridge D1 just respectively
Between pole input terminal and negative input.The cathode output end of full-wave rectification bridge D1 is by capacitance Ch ground connection.Full-wave rectification bridge D1
Cathode output end be connected with the input terminal of LED module.
Further, soft-start module includes resistance R1, R2, diode D1, capacitance C1.The output end of power module passes through
Resistance R1 is connected with the control signal of LED control switches.The control signal of LED control switches passes through diode successively
D1, capacitance C1 ground connection.Resistance R2 is in parallel with capacitance C1.
Further, it includes exchange transient voltage sampling unit, voltage sample zoom comparison list that LED, which drives adjustment module,
Member, voltage pwm adjust unit, current sampling unit, current sample zoom comparison unit, electric current PWM and adjust unit.LED module
Input terminal be connected with the input terminal for exchanging transient voltage sampling unit by resistance Rh；Exchange transient voltage sampling unit
Output end is connected with the input terminal of voltage sample zoom comparison unit；The output end and voltage of voltage sample zoom comparison unit
The input terminal that PWM adjusts unit is connected.The output end of LED control switches is connected with the input terminal of current sampling unit；Electricity
The output end of stream sampling unit is connected with the input terminal of current sample zoom comparison unit；Current sample zoom comparison unit
The input terminal that output end adjusts unit with electric current PWM is connected.Voltage pwm adjusts unit and electric current PWM adjusts the output of unit
End is connected with the control signal of LED control switches respectively.The input terminal of exchange transient voltage sampling unit passes through capacitance Cp
Ground connection.
Further, LED power control module include photo resistance R0, microcontroller U1, resistance Rs1, Rs2, R10, R20,
NPN type triode Q2, NPN type triode Q3.Photo resistance R0 is connected with the sampling input terminal of microcontroller U1.Microcontroller U1's
First output end is connected by resistance R10 with the base stage of NPN type triode Q2.The second output terminal of microcontroller U1 passes through resistance
R20 is connected with the base stage of NPN type triode Q3.LED drive adjustment module current sample input terminal by resistance Rs1 with
The collector of NPN type triode Q2 is connected；The emitter of NPN type triode Q2 is grounded.The electric current of LED driving adjustment modules is adopted
Sample input terminal is connected by resistance Rs2 with the collector of NPN type triode Q3；The emitter of NPN type triode Q3 is grounded.Electricity
Resistance Rs1 is different from the resistance value of resistance Rs2, and the electric current for being respectively used to adjust the current sample input terminal of LED driving adjustment modules is adopted
Sample value.The resistance value of photo resistance R0 changes according to the brightness of surrounding.The input terminal of microcontroller U1 receives adopting for photo resistance R0
Then sample signal converts the sampled signal of simulation to digital signal.Microcontroller U1 is by sampled signal respectively with first with reference to letter
Number, the second reference signal is compared.If sampled signal is more than the first reference signal and is less than the second reference signal；Then microcontroller
The first output end of U1 exports high level, the Q2 conductings of control NPN type triode, and resistance Rs1 drives LED in the electric current of adjustment module
Sampling input terminal is shunted；The current sampling data of the current sample input terminal of LED driving adjustment modules changes；LED drives
Dynamic adjustment module carries out electric current PWM adjustings to the control signal of LED control switches, adjusts the power of LED module.If sampling letter
Number be more than the second reference signal；Then the second output terminal of microcontroller U1 exports high level, the Q3 conductings of control NPN type triode, electricity
Resistance Rs2 drives the current sample input terminal of adjustment module to shunt LED；LED drives the current sample input of adjustment module
The current sampling data at end changes；LED drives adjustment module to carry out electric current PWM tune to the control signal of LED control switches
Section, adjusts the power of LED module.
The beneficial effects of the utility model：
(1) soft-start module of the LED drive system makes LED module be connected in the zero crossing of alternating current, avoids to LED
Module causes heavy current impact.
(2) the LED power control module of the LED drive system incudes the brightness of surrounding；According to different brightness,
The power of LED module is rationally adjusted, to achieve the purpose of energy saving；Photo resistance R0 is adopted using microcontroller U1
Sample signal carries out analog-to-digital conversion and compares, and circuit structure is simple, at low cost.
Description of the drawings
Fig. 1 is the circuit structure block diagram of the LED drive system of the utility model.
Fig. 2 is the circuit diagram of power module in Fig. 1.
Fig. 3 is the circuit diagram of soft-start module in Fig. 1.
Fig. 4 is the circuit structure block diagram that LED drives adjustment module in Fig. 1.
Fig. 5 is the circuit diagram of LED power control module in Fig. 1.
Wherein, the reference numeral of Fig. 1 to Fig. 5 is：Power module 1, LED module 2, LED controls switch 3, LED drivings are adjusted
Module 4, soft-start module 5, LED power control module 6；Exchange transient voltage sampling unit 41, voltage sample zoom comparison list
Member 42, voltage pwm adjust unit 43, current sampling unit 44, current sample zoom comparison unit 45, electric current PWM and adjust unit
46。
Specific implementation mode
With reference to the accompanying drawings and examples, the utility model is expanded on further.
As shown in Figure 1, a kind of LED drive system, including power module 1, LED driving adjustment module 4, LED control switches
3, soft-start module 5, LED module 2, LED power control module 6.
Power module 1, LED module 2, LED control switches 3 are sequentially connected.The input terminal of LED module 2 is adjusted with LED drivings
The voltage sample input terminal of module 4 is connected.LED controls the current sample of the output end and LED driving adjustment modules 4 of switch 3
Input terminal is connected.The control signal that the output end of LED driving adjustment modules 4 controls switch 3 with LED is connected.Power supply mould
The output end of block 1 is connected with the input terminal of soft-start module 5.The control of the output end of soft-start module 5 and LED control switches 3
Input terminal processed is connected.The output end of LED power control module 6 drives the current sample input terminal of adjustment module 4 to be connected with LED
It connects.LED drives adjustment module 4 to control the control signal that LED controls switch 3 by pwm pulse signal；Also, LED drivings are adjusted
Section module 4 samples the voltage and current of LED module 2, and is controlled respectively to LED according to voltage sample value, current sampling data
The control signal for making switch 3 carries out voltage pwm adjusting, electric current PWM is adjusted, and ensures LED module 2 with stable voltage and current
It works.Soft-start module 5 is so that LED module 2 avoids causing high current to LED module 2 in the zero crossing conducting of alternating current
Impact.LED power control module 6 changes the current sample input that LED drives adjustment module 4 according to the power adjustment signal of input
The current sampling data at end drives the electric current PWM of adjustment module 4 to adjust to adjust the power of LED module 2 using LED.
Specifically, as shown in Fig. 2, power module 1 include fuse F1, capacitance Cx, varistor MOV, full-wave rectification bridge D1,
Capacitance Ch.
Fuse F1 is connected on the electrode input end of full-wave rectification bridge D1, and capacitance Cx, that varistor MOV is connected across all-wave respectively is whole
Between the electrode input end and negative input that flow bridge D1.The cathode output end of full-wave rectification bridge D1 is by capacitance Ch ground connection.Entirely
The cathode output end of wave rectifier bridge D1 is connected by a diode with the input terminal of LED module 2, and the diode is for controlling electricity
The one-way conduction on road.For capacitance Cx for filtering, city's AC conversion is direct current by full-wave rectification bridge D1.Capacitance Ch is whole to all-wave
The direct current for flowing bridge D1 outputs carries out voltage stabilizing.
Specifically, as shown in figure 3, soft-start module 5 includes resistance R1, R2, diode D1, capacitance C1.
The control signal that the output end of power module 1 controls switch 3 by resistance R1 with LED is connected.LED controls are opened
The control signal for closing 3 passes through diode D1, capacitance C1 ground connection successively.Resistance R2 is in parallel with capacitance C1.
When powering on, the control signal for controlling switch 3 for LED by resistance R1 provides operating voltage, passes through diode first
D1 charges to capacitance C1, in the moment that power supply has just been connected, the internal resistance very little at the both ends capacitance C1, and the transient voltage at both ends
It is approximately 0V, the voltage of the control signal of LED control switches 3 is pulled low and is in cut-off state.With the increasing in charging time
Add, the voltage at the both ends capacitance C1 slowly rises, and after reaching threshold value, LED controls switch 3 and enters working condition, output end output
Electric current also slowly rises, and the electric current of LED module 2 also slowly rises since 0 therewith, until the current value of setting, completes soft open
Dynamic process.Resistance R2 be discharge resistance, effect be the electrical energy discharge for when power is off at once storing the both ends capacitance C1, so as to
It restPoses when short time re-powers.The effect of diode D1 is to play one-way isolation to the voltage at the both ends capacitance C1,
It avoids after completing soft start, the voltage of capacitance C1 pours in down a chimney to the control signal of LED control switches 3, causes LED control switches
3 lagss in response.The time of soft start depends on the R.C time constants of capacitance C1 and resistance R1, selects capacitance C1 and electricity appropriate
The value for hindering R1 can make in soft-start time setting in the desired range.
Specifically, as shown in figure 4, LED driving adjustment modules 4 include exchange transient voltage sampling unit 41, voltage sample
Zoom comparison unit 42, voltage pwm adjust unit 43, current sampling unit 44, current sample zoom comparison unit 45, electric current
PWM adjusts unit 46.
The input terminal of LED module 2 is connected by resistance Rh with the input terminal for exchanging transient voltage sampling unit 41；Exchange
The output end of transient voltage sampling unit 41 is connected with the input terminal of voltage sample zoom comparison unit 42；Voltage sample amplifies
The input terminal that the output end of comparing unit 42 adjusts unit 43 with voltage pwm is connected.LED controls the output end and electricity of switch 3
The input terminal of stream sampling unit 44 is connected；The output end of current sampling unit 44 is defeated with current sample zoom comparison unit 45
Enter end to be connected.The input terminal that the output end of current sample zoom comparison unit 45 adjusts unit 46 with electric current PWM is connected.Electricity
Pressure PWM adjusts unit 43 and the output end of electric current PWM adjusting units 46 is connected with the control signal of LED control switches 3 respectively
It connects.The input terminal of exchange transient voltage sampling unit 41 is grounded by capacitance Cp.
Operating voltage, the size of current of LED module 2 are controlled by LED control switches 3, and the work shape of LED control switches 3
State is controlled by LED driving adjustment modules 4 again.Resistance Rh divides the voltage of 2 input terminal of LED module, capacitance Cp for pair
Voltage be filtered, exchange transient voltage sampling unit 41 samples the voltage of LED module 2；Voltage sample amplification ratio
The sampled voltage for exchanging transient voltage sampling unit 41 is amplified compared with unit 42, and sampled voltage and reference voltage are carried out
Compare；Voltage pwm adjusts unit 43 and controls switch 3 according to the comparison result control LED of voltage sample zoom comparison unit 42
Frequency and time of the conducting with cut-off so that LED module 2 keeps stable voltage.Resistance Rs is used for detecting the electricity of LED module 2
Stream, when electric current is by resistance Rs, current sampling unit 44 obtains the sampled value of 2 electric current of LED module, and amplifies by current sample
Comparing unit 45 amplifies；Sample rate current and reference current are compared by current sample zoom comparison unit 45；Electric current PWM is adjusted
Unit 46 controls the frequency of the conducting and cut-off of switch 3 according to the comparison result control LED of current sample zoom comparison unit 45
And the time so that LED module 2 keeps stable electric current.
Specifically, as shown in figure 5, LED power control module 6 includes photo resistance R0, microcontroller (MCU) U1, resistance
Rs1, Rs2, R10, R20, NPN type triode Q2, NPN type triode Q3.
Photo resistance R0 is connected with the sampling input terminal of microcontroller U1.The first output end of microcontroller U1 passes through resistance
R10 is connected with the base stage of NPN type triode Q2.The second output terminal of microcontroller U1 passes through resistance R20 and NPN type triode Q3
Base stage be connected.The current collection that the current sample input terminal of LED driving adjustment modules 4 passes through resistance Rs1 and NPN type triode Q2
Pole is connected；The emitter of NPN type triode Q2 is grounded.The current sample input terminal of LED driving adjustment modules 4 passes through resistance
Rs2 is connected with the collector of NPN type triode Q3；The emitter of NPN type triode Q3 is grounded.Resistance Rs1 and resistance Rs2's
Resistance value is different, is respectively used to adjust the current sampling data of the current sample input terminal of LED driving adjustment modules 4.Photo resistance R0
Resistance value according to surrounding brightness and change.The input terminal of microcontroller U1 receives the sampled signal of photo resistance R0, then by mould
Quasi- sampled signal is converted into digital signal；
Sampled signal is compared with the first reference signal, the second reference signal by microcontroller U1 respectively；If sampled signal
More than the first reference signal and it is less than the second reference signal；Then the first output end of microcontroller U1 exports high level, controls NPN type
Triode Q2 conductings, resistance Rs1 drive the current sample input terminal of adjustment module 4 to shunt LED；LED drivings adjust mould
The current sampling data of the current sample input terminal of block 4 changes；LED drives control of the adjustment module 4 to LED control switches 3
Input terminal carries out electric current PWM adjustings, adjusts the power of LED module 2；If sampled signal is more than the second reference signal；Then microcontroller
The second output terminal of U1 exports high level, the Q3 conductings of control NPN type triode, and resistance Rs2 drives LED the electricity of adjustment module 4
Stream sampling input terminal is shunted；The current sampling data of the current sample input terminal of LED driving adjustment modules 4 changes；LED
It drives the control signal that adjustment module 4 controls LED on switch 3 to carry out electric current PWM adjustings, adjusts the power of LED module 2.
LED power control module 6 incudes the brightness of surrounding；According to different brightness, to the power of LED module 2
It is rationally adjusted, to achieve the purpose of energy saving；Modulus is carried out to the sampled signal of photo resistance R0 using microcontroller U1
It converts and compares, circuit structure is simple, at low cost.
Specifically, it includes NMOS field-effect tube that LED, which controls switch 3,.Soft-start module 5, LED drive the defeated of adjustment module 4
Outlet is connected with the pole the grid of NMOS field-effect tube (G) respectively.The output end of LED module 2 and pole leakage (D) of NMOS field-effect tube
It is connected.Pole source (S) of NMOS field-effect tube is by resistance Rs ground connection.
Above-described is only preferred embodiments of the present invention, and the utility model is not limited to above example.It can
With understand, those skilled in the art directly export or associate under the premise of not departing from the basic conception of the utility model its
It is improved and variation is considered as being included within the scope of protection of this utility model.
Claims (6)
1. a kind of LED drive system, it is characterised in that：
Including power module (1), LED module (2), LED control switches (3), LED driving adjustment modules (4), soft-start module
(5)；
Power module (1), LED module (2), LED control switches (3) are sequentially connected；
The input terminal of LED module (2) is connected with the voltage sample input terminal of LED driving adjustment modules (4)；
The output end of LED control switches (3) is connected with the current sample input terminal of LED driving adjustment modules (4)；
The control signal that the output end of LED driving adjustment modules (4) controls switch (3) with LED is connected；
The output end of power module (1) is connected with the input terminal of soft-start module (5)；
The control signal that the output end of soft-start module (5) controls switch (3) with LED is connected；
LED drives adjustment module (4) to control the control signal that LED controls switch (3) by pwm pulse signal；Also, LED
Driving adjustment module (4) samples the voltage and current of LED module (2), and respectively according to voltage sample value, current sample
Be worth the adjusting of control signal progress voltage pwm, the electric current PWM adjustings that switch (3) is controlled LED；
Soft-start module (5) is used to carry out soft start to LED module (2).
2. LED drive system according to claim 1, it is characterised in that：
Further include LED power control module (6)；
The output end of LED power control module (6) is connected with the current sample input terminal of LED driving adjustment modules (4)；
LED power control module (6) changes the current sample of LED driving adjustment modules (4) according to the power adjustment signal of input
The current sampling data of input terminal is adjusted using the electric current PWM of LED driving adjustment modules (4) to adjust the power of LED module (2).
3. LED drive system according to claim 1, it is characterised in that：
Power module (1) includes fuse F1, capacitance Cx, varistor MOV, full-wave rectification bridge D1, capacitance Ch；
Fuse F1 is connected on the electrode input end of full-wave rectification bridge D1；Capacitance Cx, varistor MOV are connected across full-wave rectification bridge respectively
Between the electrode input end and negative input of D1；
The cathode output end of full-wave rectification bridge D1 is by capacitance Ch ground connection；
The cathode output end of full-wave rectification bridge D1 is connected with the input terminal of LED module (2).
4. LED drive system according to claim 1, it is characterised in that：
Soft-start module (5) includes resistance R1, R2, diode D1, capacitance C1；
The control signal that the output end of power module (1) controls switch (3) by resistance R1 with LED is connected；
The control signal of LED control switches (3) passes through diode D1, capacitance C1 ground connection successively；
Resistance R2 is in parallel with capacitance C1.
5. LED drive system according to claim 1, it is characterised in that：
LED drive adjustment module (4) include exchange transient voltage sampling unit (41), voltage sample zoom comparison unit (42),
Voltage pwm adjusts unit (43), current sampling unit (44), current sample zoom comparison unit (45), electric current PWM and adjusts unit
(46)；
The input terminal of LED module (2) is connected by resistance Rh with the input terminal for exchanging transient voltage sampling unit (41)；Exchange
The output end of transient voltage sampling unit (41) is connected with the input terminal of voltage sample zoom comparison unit (42)；Voltage sample
The input terminal that the output end of zoom comparison unit (42) adjusts unit (43) with voltage pwm is connected；
The output end of LED control switches (3) is connected with the input terminal of current sampling unit (44)；Current sampling unit (44)
Output end is connected with the input terminal of current sample zoom comparison unit (45)；The output of current sample zoom comparison unit (45)
The input terminal for adjusting unit (46) with electric current PWM is held to be connected；
Voltage pwm adjusts unit (43) and electric current PWM adjusts the output end control with LED control switches (3) respectively of unit (46)
Input terminal processed is connected；
The input terminal of exchange transient voltage sampling unit (41) is grounded by capacitance Cp.
6. LED drive system according to claim 2, it is characterised in that：
LED power control module (6) includes photo resistance R0, microcontroller U1, resistance Rs1, Rs2, R10, R20, NPN type triode
Q2, NPN type triode Q3；
Photo resistance R0 is connected with the sampling input terminal of microcontroller U1；
The first output end of microcontroller U1 is connected by resistance R10 with the base stage of NPN type triode Q2；
The second output terminal of microcontroller U1 is connected by resistance R20 with the base stage of NPN type triode Q3；
The current sample input terminal of LED driving adjustment modules (4) is connected by resistance Rs1 with the collector of NPN type triode Q2
It connects；The emitter of NPN type triode Q2 is grounded；
The current sample input terminal of LED driving adjustment modules (4) is connected by resistance Rs2 with the collector of NPN type triode Q3
It connects；The emitter of NPN type triode Q3 is grounded；
Resistance Rs1 is different from the resistance value of resistance Rs2, is respectively used to adjust the current sample input terminal of LED driving adjustment modules (4)
Current sampling data；
The resistance value of photo resistance R0 changes according to the brightness of surrounding；
The input terminal of microcontroller U1 receives the sampled signal of photo resistance R0, then converts the sampled signal of simulation to digital letter
Number；
Sampled signal is compared with the first reference signal, the second reference signal by microcontroller U1 respectively；
If sampled signal is more than the first reference signal and is less than the second reference signal；Then the first output end output of microcontroller U1 is high
Level, the Q2 conductings of control NPN type triode, resistance Rs1 divide the current sample input terminal of LED driving adjustment modules (4)
Stream；The current sampling data of the current sample input terminal of LED driving adjustment modules (4) changes；LED drives adjustment module (4)
The control signal for controlling LED switch (3) carries out electric current PWM adjustings, the power of adjustment LED module (2)；
If sampled signal is more than the second reference signal；Then the second output terminal of microcontroller U1 exports high level, three pole of control NPN type
Pipe Q3 conductings, resistance Rs2 shunt the current sample input terminal of LED driving adjustment modules (4)；LED drives adjustment module
(4) current sampling data of current sample input terminal changes；LED drives adjustment module (4) to control switch (3) to LED
Control signal carries out electric current PWM adjustings, the power of adjustment LED module (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820604872.2U CN208029159U (en) | 2018-04-26 | 2018-04-26 | A kind of LED drive system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820604872.2U CN208029159U (en) | 2018-04-26 | 2018-04-26 | A kind of LED drive system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208029159U true CN208029159U (en) | 2018-10-30 |
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ID=63911378
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|---|---|---|---|
| CN201820604872.2U Expired - Fee Related CN208029159U (en) | 2018-04-26 | 2018-04-26 | A kind of LED drive system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108449840A (en) * | 2018-04-26 | 2018-08-24 | 深圳市立智达光电科技有限公司 | A kind of LED drive system |
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2018
- 2018-04-26 CN CN201820604872.2U patent/CN208029159U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108449840A (en) * | 2018-04-26 | 2018-08-24 | 深圳市立智达光电科技有限公司 | A kind of LED drive system |
| CN108449840B (en) * | 2018-04-26 | 2024-08-13 | 深圳市立智达光电科技有限公司 | LED driving system |
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