CN106954313B - A kind of LED linear constant-current drive circuit of adaptive network voltage - Google Patents
A kind of LED linear constant-current drive circuit of adaptive network voltage Download PDFInfo
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- CN106954313B CN106954313B CN201710302742.3A CN201710302742A CN106954313B CN 106954313 B CN106954313 B CN 106954313B CN 201710302742 A CN201710302742 A CN 201710302742A CN 106954313 B CN106954313 B CN 106954313B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
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Abstract
The invention discloses a kind of LED drive circuits, more particularly to a kind of LED linear constant-current drive circuit of adaptive network voltage, which specifically includes that AC power source, rectifier bridge, capacitor, diode, constant current chip one, constant current chip two, LED light string one, LED light string two, sampling resistor one, sampling resistor two, sampling resistor three.The LED linear constant-current drive circuit of this adaptive network voltage drives two groups of LED light strings, when network voltage is 120Vac, two groups of LED light are series-parallel, and when network voltage is 220Vac, two groups of LED light string series connection, so that the circuit, which is either in any in above two network voltage, of the invention LED linear constant-current drive circuit, to be adapted to automatically, and their system effectiveness is suitable.
Description
Technical field
The present invention relates to a kind of LED drive circuit, the LED linear constant current more particularly to a kind of adaptive network voltage is driven
Dynamic circuit.
Background technique
LED linear constant-current drive circuit, it is simple, low in cost with its scheme, excellent without high frequency transformer and without EMC problem etc.
Point has been more and more widely used.But the linear constant current driving circuit of LED light on the market can not all fit simultaneously mostly at present
Ying Yu is with the U.S., two kinds of network voltages of the Japanese 120Vac to represent and the 220Vac with China as representative.For example, such as Fig. 1
Shown, the input terminal of the output end connection rectifier bridge 101 of input ac power AC, the output plus terminal of rectifier bridge 101 connects LED light
The anode of string 102 and one end of capacitor 109, the output negativing ending grounding of rectifier bridge 101, the other end ground connection of capacitor 109；Constant current core
Piece 103 is made of operational amplifier 104, reference voltage Vref and power tube 105；The positive input of operational amplifier 104 terminates base
Quasi- voltage Vref；The negative terminal of LED light string 102 enters constant current chip 103, and is connected with the drain electrode of power tube 105；Power tube 105
Grid be connected with the output end of operational amplifier 104, the source electrode of power tube 105 is connected with 106 one end of current sampling resistor, together
When be connected with the negative input end of operational amplifier 104；The other end of current sampling resistor 106 is grounded.
Assuming that input voltage is Vin, after over commutation, the voltage of output signal 107 is Vbulk, LED light string 102
Voltage is Vled, then having electric current to flow through from LED light string 102 when Vbulk is greater than Vled, and enters constant current chip 103, and
Voltage signal 108 is formed on current sampling resistor 106, operational amplifier 104 passes through by comparing the signal of positive-negative input end
Output signal controls the grid of power tube 105, so that the drain-source voltage across poles Vds dynamic of power tube 105 adjusts, so that voltage is believed
Numbers 108 equal with reference voltage Vref, achievees the purpose that constant to flow through 102 electric current of LED light string.
So Vin is bigger, and the voltage Vbulk of signal 107 is bigger, then voltage Vds is bigger between the drain-source of power tube 105,
The power consumption of power tube 105 is bigger.
In Fig. 2, it is assumed that be state one when Vin=120Vac, shade section one is the Vds pressure of power tube 105 in figure
Difference, this partial pressure differential are multiplied with flowing through the electric current of power tube 105, as the power consumption of power tube 105.It is similarly assumed that Vin=
When 220Vac, shade section two is the Vds pressure difference of power tube 105, electric current of this partial pressure differential with flowing through power tube 105 in figure
It is multiplied, as the power consumption of power tube 105.It is obvious that shade section two is more much larger than the area in shade section one, that is, when
When Vin=220Vac, the power consumption of power tube 105 compares larger.
In circuit shown in Fig. 1, whole system efficiency isAssuming that when Vled=120V, Vin=120Vac, it is whole
A efficiency is η ≈ 80%；And work as Vin=220Vac, entire efficiency is then η ≈ 35%.
Global country variant, there are two types of network voltages, and one is with the U.S., Japan is the 120Vac of representative, and another kind is
Using China as the 220Vac of representative.Existing LED linear constant-current drive circuit shown in Fig. 1, by the reason of above-mentioned analysis it is found that its
It can not be adapted to two kinds of network voltages simultaneously.
In conclusion urgent problem to be solved is, a kind of improved LED linear constant-current drive circuit is designed, it can be automatic
Adapt to the two different network voltages of 120Vac and 220Vac.
Summary of the invention
The object of the present invention is to provide a kind of LED linear constant-current drive circuits of adaptive network voltage, can pass through
The automatic change of circuit series and parallel mode and the adaptive two different network voltages of 120Vac and 220Vac, and when power grid electricity
When pressing either 120Vac or 220Vac, their system effectiveness is suitable.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of LED linear of adaptive network voltage
Constant-current drive circuit, the LED linear constant-current drive circuit include: capacitor, diode, constant current chip one, constant current chip two, sampling
Resistance one, sampling resistor two, sampling resistor three；Wherein, the constant current chip one includes operational amplifier one, power tube one and base
Quasi- voltage one, constant current chip two are put including operational amplifier two, power tube two, reference voltage two, switching tube, comparator, operation
Big device three, power tube three, reference voltage three and reference voltage four；One end of the capacitor be respectively connected to external dc power,
The drain electrode of the anode of external LED lamp string one and the power tube one, the other end ground connection of the capacitor, the anode of the diode
It is respectively connected to the drain electrode of the negative terminal and the power tube two of the external LED lamp string one, the negative terminal of the diode connects respectively
It is connected to one end of the source electrode of the power tube one, the negative input end of the operational amplifier one and the sampling resistor two, it is described
The grid of power tube one is connected to the output end of the operational amplifier one, and the positive input terminal of the operational amplifier one is connected to
The anode of the reference voltage one (212), the negative terminal of the reference voltage one (212) are connected to reference to ground, the sampling resistor
Two other end is respectively connected to the anode of external LED lamp string two and the reference ground, the drain electrode of the power tube three are connected to
The negative terminal of the external LED lamp string two, the grid of the power tube three are respectively connected to the output end of the operational amplifier three
With the negative input end of the comparator, three positive input terminal of operational amplifier is connected to the anode of the reference voltage four, institute
It states three negative input end of operational amplifier and is respectively connected to the source electrode of the power tube three and one end of the sampling resistor three, it is described
The other end of the negative terminal of reference voltage four and the sampling resistor three ground connection, the positive input terminal of the comparator are connected to the base
The anode of quasi- voltage three, the output end of the comparator are connected to the grid of the switching tube, the negative terminal of the reference voltage three
Be grounded with the source electrode of the switching tube, the drain electrode of the switching tube be respectively connected to the power tube two grid and the operation
The output end of amplifier two, the positive input terminal of the operational amplifier two are connected to the anode of the reference voltage two, the fortune
The negative input end for calculating amplifier two is respectively connected to the source electrode of the power tube two and one end of the sampling resistor one, the base
The negative terminal of quasi- voltage two and the other end ground connection of the sampling resistor one；
Assuming that the resistance value of the sampling resistor two, sampling resistor three is Rcs2 and Rcs3, four He of reference voltage respectively
The voltage value of reference voltage one is respectively Vref4 and Vref2, they meet following formula:
In an optimal technical scheme of the invention, the LED linear constant-current drive circuit further include: rectifier bridge, the rectifier bridge
Input terminal connection external power supply be used for AC rectification into direct current, the output plus terminal of the rectifier bridge is connected to described outer
The anode of portion's LED light string one, the output negativing ending grounding of the rectifier bridge.
In the another optimal technical scheme of the present invention, the sampling resistor one, the sampling electricity of the LED linear constant-current drive circuit
Resistance two and sampling resistor three are connected or are formed in parallel by multiple resistance respectively, the sampling resistor one, sampling resistor two and are adopted
The resistance value of sample resistance three is identical, and the voltage of the LED light string one and LED light string two is 120V.
Compared with the existing technology, the invention has the advantages that the LED linear constant current of the adaptive network voltage of the present invention drives electricity
Two groups of LED light strings are driven in road, when network voltage is 120Vac, two groups of LED light are series-parallel, and when network voltage is 220Vac
When, two groups of LED light string series connection, so that the LED linear constant-current drive circuit is either in 220Vac and two kinds of 120Vac
Among any in network voltage, which can adapt to automatically, and their system effectiveness phase
When.
Detailed description of the invention
Fig. 1 is the circuit diagram of the LED linear constant-current drive circuit of the prior art；
Fig. 2 is the simplified timing diagram based on LED linear constant-current drive circuit shown in FIG. 1；
Fig. 3 is the circuit diagram of the LED linear constant-current drive circuit of adaptive network voltage of the invention；
Fig. 4 is the LED linear constant-current drive circuit of adaptive network voltage shown in Fig. 3 in state current path for the moment
Schematic diagram；
Fig. 5 is current path of the LED linear constant-current drive circuit of adaptive network voltage shown in Fig. 3 in state two
Schematic diagram；
Fig. 6 is the simplified timing diagram of the LED linear constant-current drive circuit of adaptive network voltage shown in Fig. 3；
Specific embodiment
Further to disclose technical solution of the present invention, it is hereby described with reference to the accompanying drawings embodiments of the present invention:
The purpose for providing specific embodiment is sufficiently disclose the present invention, so that those skilled in the art's energy
Enough realize technical solution disclosed in this invention.It is based on above purpose, includes in the specific embodiment that this part provides
A large amount of detail, such as specific device, method and particular number, parameter, but they are not necessarily to be construed as pair
The limitation of interest field of the present invention.
Embodiment 1:
As shown in figure 3, it illustrates the circuits of the LED linear constant-current drive circuit of adaptive network voltage of the invention to show
It is intended to, which includes: AC power source, rectifier bridge 201, capacitor 230, diode 203, constant current chip
One 204, constant current chip 2 206, LED light string 1, LED light string 2 205, sampling resistor 1, sampling resistor 2 213, adopt
Sample resistance 3 208, with reference to ground 214；Wherein, the constant current chip 1 includes operational amplifier 1, one 210 and of power tube
Reference voltage 1；Constant current chip 2 206 includes operational amplifier 2 222, power tube 2 223, reference voltage 2 221, switch
Pipe 224, comparator 225, operational amplifier 3 228, power tube 3 227, reference voltage 3 226 and reference voltage 4 229.It is external
The input terminal of AC power source is connected to the input terminal of rectifier bridge 201, the output negativing ending grounding of rectifier bridge 201, and rectifier bridge 201 exports
Positive 230 one end of termination capacitor, while being connected with one 202 anode of LED light string, tie point is signal 231, and signal 231 enters constant current
Chip 1 is connected with the drain electrode of power tube 1, the output end phase of the grid and operational amplifier 1 of power tube 1
Even, the anode of the positive input of operational amplifier 1 termination reference voltage 1, the source electrode of power tube 1 respectively with two poles
The negative terminal of pipe 203 is connected with the negative input end of operational amplifier 1, while being connected with one end of sampling resistor 2 213, benchmark
The negative terminal of voltage 1 is connected with the other end of sampling resistor 2 213, at the same with reference 214 be connected, diode 203 is just
End is connected with one 202 negative terminal of LED light string, which enters constant current chip 2 206 simultaneously, with power tube 2 223
Drain electrode is connected, and the grid of power tube 2 223 is connected with the output end of operational amplifier 2 222, while the drain electrode with switching tube 224
Be connected, the anode of the positive input of operational amplifier 2 222 termination reference voltage 2 221, the source electrode of power tube 2 223 respectively with adopt
One end of sample resistance 1 is connected with the negative input end of operational amplifier 2 222, the other end ground connection of sampling resistor 1, base
The other end of quasi- voltage 2 221 is grounded, and the source electrode ground connection of switching tube 224,2 205 anode of LED light string is connected with reference to ground 214,
2 205 negative terminal of LED light string enters constant current chip 2 206, is connected with the drain electrode of power tube 3 227, the grid of power tube 3 227 with
The output end of operational amplifier 3 228 is connected, while being connected with the negative input end of comparator 225, and operational amplifier 3 228 is just
Input termination reference voltage 4 229 anode, the negativing ending grounding of reference voltage 4 229, the source electrode of power tube 3 227 respectively with adopt
One end of sample resistance 3 208 is connected with the negative input end of operational amplifier 3 228, the other end ground connection of sampling resistor 3 208, than
Compared with the anode of the positive input termination reference voltage 3 226 of device 225, the output of comparator 225 is connected with the grid of switching tube 224.
Assuming that the voltage of reference voltage 4 229 and reference voltage 1 is Vref4, Vref2 and sampling resistor one respectively
207, sampling resistor 2 213, sampling resistor 3 208 resistance value be Rcs1, Rcs2, Rcs3 respectively, Rcs2, Rcs3 in the present invention,
Following formula should be met between Vref4, Vref2:
Formula:Namely
Simultaneously, it is assumed that the voltage of capacitor 230 is Vbulk, and the voltage of LED light string 1 is Vled1, LED light string 2 205
Voltage be Vled2, and Vled1=Vled2=120V.
As an example below based on above-mentioned formula: as the voltage Vref4 of reference voltage 4 229 is greater than reference voltage 1
Resistance value Rcs1, Rcs2, Rcs3 phase of voltage Vref2 and sampling resistor 1, sampling resistor 2 213, sampling resistor 3 208
Deng above formula can be met.
Specifically, Fig. 4 be adaptive network voltage shown in Fig. 3 LED linear constant-current drive circuit state for the moment
Current path schematic diagram；Fig. 5 is the LED linear constant-current drive circuit of adaptive network voltage shown in Fig. 3 in state two
Current path schematic diagram；Fig. 6 is the simplified timing diagram of the LED linear constant-current drive circuit of adaptive network voltage shown in Fig. 3.
Assuming that being state one when external input voltage Vin=120Vac, in conjunction with Fig. 4 and Fig. 6, the electric current flowed out from capacitor 230 is divided into two
Road.Enter the power tube 2 223 of constant current chip 2 206 by LED light string 1 all the way, and passes through sampling resistor 1, stream
Enter ground.This road electric current is assumed to be iled1, and voltage signal 232 is formed on sampling resistor 1, and operational amplifier 2 222 passes through
The signal for comparing positive-negative input end controls the grid of power tube 2 223 by output signal, so that the drain-source of power tube 2 223
Voltage across poles Vds dynamic adjusts, so that voltage signal 232 is equal with reference voltage Vref1, reaches constant and flows through LED light string one
The purpose of 202 electric currents；Another way is introduced into the power tube 1 of constant current chip 1, is then flowed by LED light string 2 205
The power tube 3 227 of constant current chip 2 206, then by sampling resistor 3 208, flow into ground.This road electric current is assumed to be iled2,
On sampling resistor 1 formed voltage signal 234, operational amplifier 1 by comparing positive-negative input end signal, by defeated
The grid of signal control power tube 1 out, so that the drain-source voltage across poles Vds dynamic of power tube 1 adjusts, so that voltage
Signal 234 is equal with reference voltage Vref2, achievees the purpose that constant to flow through 2 205 electric current of LED light string.Due to voltage signal 234
Equal with reference voltage Vref2, sampling resistor 1, sampling resistor 2 213, the resistance value of sampling resistor 3 208 are identical, then
This road electric current iled2 flow into voltage signal 233 of the constant current chip 2 206 on sampling resistor 3 208 also with reference voltage Vref2
It is equal, since the voltage Vref4 of reference voltage 4 229 is greater than the voltage Vref2 of reference voltage 1, that is, operation amplifier
The positive input terminal voltage Vref4 of device 3 228 is greater than negative input end voltage, and operational amplifier 3 228 exports maximum voltage, power tube
3 227 are in linear zone, pass-through state.In addition, 225 negative input end voltage of comparator is greater than positive input terminal voltage Vref3, output
For no-voltage, switching tube 224 is in off state, and switching tube 224 does not influence the state of a control of power tube 2 223.Diode 203
The voltage of positive end signal 236 is Vbulk-Vled1, and the voltage of 203 negative terminal signal 234 of diode is Vled2.At this point, considering
Input voltage vin is 120Vac, Vled1=Vled2=120V, then the voltage max of the positive end signal 236 of diode 203 is
Vbulk-Vled1=120*1.4V-120V=68V, less than the minimum voltage Vled2=of 203 negative terminal signal 234 of diode
120V.Therefore diode 203 is in blocking state.
In conclusion circuit system is in state a period of time, LED light string 1 and LED light string 2 205, actually work in Fig. 4
Make there is constant current to flow through respectively in parallel connection.
State a period of time, whole system efficiencyWherein Vled1=Vled2=120V, Vbulk maximum value
1.4*120V, whole efficiency are η ≈ 80%；
Assuming that being state two when Vin=220Vac, in conjunction with Fig. 5 and Fig. 6, the electric current flowed out from capacitor 230 passes through LED light
1 are gone here and there by diode 203, after sampling resistor 2 213, then flows into constant current chip two by LED light string 2 205
206 power tube 3 227 flows into ground using sampling resistor 3 208, and electric current forms voltage signal on sampling resistor 3 208
233, operational amplifier 3 228 controls the grid of power tube 3 227 by output signal by comparing the signal of positive-negative input end
Pole, so that the drain-source voltage across poles Vds dynamic of power tube 3 227 adjusts, so that voltage signal 233 and reference voltage Vref4 phase
Deng achieving the purpose that constant current, power tube 3 227 is in saturation region at this time.Due to voltage signal 233 and reference voltage
Vref4 is equal, and sampling resistor 1, sampling resistor 2 213, the resistance value of sampling resistor 3 208 are identical, then electric current is sampling
Voltage signal 234 on resistance 2 213 is also equal with reference voltage Vref4, since the voltage Vref4 of reference voltage 4 229 is big
It is less than negative input in the positive input terminal voltage Vref2 of the voltage Vref2 of reference voltage 1, that is, operational amplifier 1
Voltage is held, operational amplifier 1 exports no-voltage, and power tube 1 works in cut-off region, is in off state, not
Electric current flows through the power tube 1 of constant current chip 1.In addition, above-mentioned power tube 3 227 is in saturation region, grid voltage
Signal 235 is slightly larger than the cut-in voltage Vth of power tube 3 227, and 225 negative input end voltage signal 235 of comparator is less than at this time
Positive input terminal voltage Vref3 exports as high voltage, and switching tube 224 is in the conductive state, then the grid of power tube 2 223 is
No-voltage, then power tube 2 223 is in off state, there is no the power tubes 2 223 that electric current flows through constant current chip 2 206.
The voltage of the positive end signal 236 of diode 203 is Vbulk-Vled1, and the voltage of 203 negative terminal signal 234 of diode is Vled2.When
When Vbulk-Vled1-Vled2 > 0, that is, when Vbulk voltage is greater than 240V, diode 203 begins to be on shape
State.In state two, the voltage max of the positive end signal 236 of diode 203 is Vbulk-Vled1=220*1.4V-120V=
188V, the minimum voltage Vled2=120V of 203 negative terminal signal 234 of diode, therefore diode 203 is in the conductive state.
In conclusion in state two, LED light string 1 and LED light string 2 205 actually work circuit system in Fig. 5
In series connection, there is constant current to flow through.
When state two, whole system efficiencyWherein Vled1=Vled2=120V, Vbulk
Maximum value 1.4*220V, whole efficiency are η ≈ 80%.
Above by description of listed embodiment, the basic ideas and basic principles of the present invention are elaborated.But this hair
It is bright to be not limited to above-mentioned listed embodiment.It is all based on equivalent variations made by technical solution of the present invention, improve and deliberately
Equal behaviors are deteriorated, are within the scope of protection of the invention.
Claims (3)
1. a kind of LED linear constant-current drive circuit of adaptive network voltage, which is characterized in that LED linear constant current driving electricity
Road include: capacitor (230), diode (203), constant current chip one (204), constant current chip two (206), sampling resistor one (207),
Sampling resistor two (213), sampling resistor three (208), wherein the constant current chip one (204) includes operational amplifier one
(211), power tube one (210) and reference voltage one (212), constant current chip two (206) include operational amplifier two (222), function
Rate pipe two (223), reference voltage two (221), switching tube (224), comparator (225), operational amplifier three (228), power tube
Three (227), reference voltage three (226) and reference voltage four (229)；One end of the capacitor (230) is respectively connected to external straight
The drain electrode in galvanic electricity source, the anode of external LED lamp string one (202) and the power tube one (210), the capacitor (230) it is another
End ground connection, the anode of the diode (203) are respectively connected to the negative terminal and the power of the external LED lamp string one (202)
The negative terminal of the drain electrode of pipe two (223), the diode (203) is respectively connected to the source electrode of the power tube one (210), the fortune
Calculate the negative input end of amplifier one (211) and one end of the sampling resistor two (213), the grid of the power tube one (210)
It is connected to the output end of the operational amplifier one (211), the positive input terminal of the operational amplifier one (211) is connected to described
The anode of reference voltage one (212), the negative terminal of the reference voltage one (212) are connected to reference to ground, the sampling resistor two
(213) the other end is respectively connected to the anode and the reference ground of external LED lamp string two (205), the power tube three (227)
Drain electrode be connected to the negative terminal of the external LED lamp string two (205), the grid of the power tube three (227) is respectively connected to institute
State the output end of operational amplifier three (228) and the negative input end of the comparator (225), the operational amplifier three (228)
Positive input terminal is connected to the anode of the reference voltage four (229), and operational amplifier three (228) negative input end is separately connected
To the source electrode of the power tube three (227) and one end of the sampling resistor three (208), the reference voltage four (229) is born
The other end of end and the sampling resistor three (208) is grounded, and the positive input terminal of the comparator (225) is connected to the benchmark electricity
The anode of three (226) is pressed, the output end of the comparator (225) is connected to the grid of the switching tube (224), the benchmark electricity
The negative terminal of three (226) and the source electrode ground connection of the switching tube (224) are pressed, the drain electrode of the switching tube (224) is respectively connected to institute
The grid of power tube two (223) and the output end of the operational amplifier two (222) are stated, the operational amplifier two (222)
Positive input terminal is connected to the anode of the reference voltage two (221), and the negative input end of the operational amplifier two (222) connects respectively
It is connected to the source electrode of the power tube two (223) and one end of the sampling resistor one (207), the reference voltage two (221)
The other end of negative terminal and the sampling resistor one (207) ground connection；
Assuming that the resistance value of the sampling resistor two (213) and sampling resistor three (208) is Rcs2 and Rcs3, the benchmark electricity respectively
The voltage value for pressing four (229) and reference voltage one (212) is respectively Vref4 and Vref2, they meet following formula:
2. the LED linear constant-current drive circuit of adaptive network voltage according to claim 1, which is characterized in that the LED
Linear constant current driving circuit further include: rectifier bridge (201), the input terminal connection external power supply of the rectifier bridge (201) is used for will
AC rectification is being connected to the external LED lamp string one (202) just at direct current, the output plus terminal of the rectifier bridge (201)
End, the output negativing ending grounding of the rectifier bridge (201).
3. the LED linear constant-current drive circuit of adaptive network voltage according to claim 1 or 2, it is characterised in that: institute
It is in series or in parallel by multiple resistance respectively to state sampling resistor one (207), sampling resistor two (213) and sampling resistor three (208)
It forms, the sampling resistor one (207), sampling resistor two (213) are identical with the resistance value of sampling resistor three (208), the LED light
The voltage of one (202) of string and LED light string two (205) is 120V.
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| CN107846745A (en) * | 2017-10-11 | 2018-03-27 | 杭州士兰微电子股份有限公司 | LED drive circuit and its control method |
| CN107820348B (en) * | 2017-12-05 | 2023-11-24 | 光美科技有限公司 | Linear full-voltage variable-frequency constant-current circuit and LED lamp with same |
| CN108012380B (en) * | 2017-12-27 | 2024-04-19 | 广东基地照明有限公司 | Linear wide-voltage constant-current constant-power circuit and LED lamp with same |
| 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 |
| CN109561546A (en) * | 2018-12-14 | 2019-04-02 | 普诚创智（成都）科技有限公司 | A kind of linear LED drive circuit of twin voltage |
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| CN206894947U (en) * | 2017-05-03 | 2018-01-16 | 南京微客力科技有限公司 | A kind of LED linear constant-current drive circuit of adaptive line voltage |
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| CN105792441B (en) * | 2016-04-29 | 2018-02-23 | 苏州智浦芯联电子科技股份有限公司 | A kind of linear constant current circuit for controllable silicon light modulation |
| CN205754944U (en) * | 2016-05-11 | 2016-11-30 | 陕西亚成微电子股份有限公司 | A kind of both-end constant-current LED driving chip |
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