CN107155232A - A kind of High Power Factor LED constant current driving power supply and its control method - Google Patents
A kind of High Power Factor LED constant current driving power supply and its control method Download PDFInfo
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- CN107155232A CN107155232A CN201710044958.4A CN201710044958A CN107155232A CN 107155232 A CN107155232 A CN 107155232A CN 201710044958 A CN201710044958 A CN 201710044958A CN 107155232 A CN107155232 A CN 107155232A
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The present invention provides a kind of High Power Factor LED constant current driving power supply and its control method, and the power supply includes pfc circuit, half-bridge resonance constant-current network, LED load and control circuit；Pfc circuit is flowed into after the rectified filtering of electric network source；Pfc circuit is exported to be connected with the input of half-bridge resonance constant-current network；The output of half-bridge resonance constant-current network connects LED load；Pfc circuit is controlled by control circuit；Control circuit carries out composite feedback to control PFC output voltage by gathering pfc circuit output voltage and LED load electric current, and by both signals, realizes the current constant control to the LED load.Pfc circuit is used to realize High Power Factor and voltage stabilizing, and half-bridge resonance constant-current network is made up of the half-bridge resonance network with constant-current characteristics, and control circuit is by gathering PFC output voltages and LED load electric current, it is achieved thereby that to the current constant control of the LED load.Have the advantages that simple control, efficiency high and constant current accuracy are high.
Description
Technical field
The present invention relates to LED drive power field, more particularly to a kind of High Power Factor LED constant current driving power supply and its
Control method.
Background technology
The lighting system of green energy conservation turns into a developing direction of society in recent years, and LED is as a kind of of new generation
Green illumination light source is the lighting source of following main flow, obtains quite varied answer in fields such as tunnel illumination, street lightings
With.According to LED C-V characteristic, to ensure its reliable work, LED needs to use constant current to drive.
High-power LED driver uses controlled resonant converter mostly, and LLC resonant converter can be realized due to its main switch
ZVS, can be effectively reduced switching loss, using relatively broad, but when LED number of driving is different, working frequency change
Scope is larger, is not suitable for the LED operation of requirement wide output voltage change.LCL or CLC resonant networks output current is joined with resonance
Number is relevant with input voltage, and when input voltage and constant resonant parameter, resonant network inherently possesses constant-current characteristics, by opening
LED constant current output can be achieved in ring control, but in actual applications, PFC voltages and resonant parameter have dispersiveness, and this can
Constant current accuracy can be caused to reduce, it is difficult to meet constant current accuracy requirement, PFC output voltages are proposed for this and are answered with LED load electric current
The control method of feedback is closed, constant current accuracy is improved.
The content of the invention
It is an object of the invention to provide a kind of High Power Factor LED constant current driving power supply and its control method.
The present invention uses following technical scheme：A kind of High Power Factor LED constant current driving power supply, it is characterised in that：Including
Pfc circuit, half-bridge resonance constant-current network, LED load and control circuit；Pfc circuit is flowed into after the rectified filtering of electric network source；
Pfc circuit is exported to be connected with the input of half-bridge resonance constant-current network；The output of half-bridge resonance constant-current network connects LED load；The PFC electricity
Route test circuit is controlled；Control circuit is by gathering pfc circuit output voltage and LED load electric current, and by both signals
Carry out composite feedback to control PFC output voltage, realize the current constant control to the LED load.
Further, the half-bridge resonance constant-current network is based on CLCL type resonant network half bridge resonant transformers.
Further, the pfc circuit uses Boost.
Further, control circuit includes current sampling circuit, matrix current adjustment circuit, voltage sample circuit, voltage x current
Compound circuit and voltage-regulating circuit；LED load electric current is connected through current sampling circuit with matrix current adjustment circuit input；Electric current
Adjustment circuit is exported to be connected with the input of voltage x current compound circuit one；Pfc circuit output voltage is through voltage sample circuit and voltage
Another input connection of electric current compound circuit；Voltage x current compound circuit is exported to be connected with voltage-regulating circuit input；Voltage is adjusted
Circuit output is used to control PFC circuit output voltages.
The present invention also provides a kind of control method of High Power Factor LED constant current driving power supply, it is characterised in that：There is provided one
High Power Factor LED constant current driving power supply, it includes pfc circuit, half-bridge resonance constant-current network, LED load and control circuit；Adopt
With the control method of PFC output voltages and LED load electric current composite feedback, pfc circuit output voltage is controlled by composite feedback
So that LED load currents keep constant；When output short-circuit and open circuit when, pfc circuit output voltage control Vmin and Vmax it
Between, the design of control circuit needs to consider pfc circuit output voltage excursion；The half-bridge circuit of half-bridge resonance constant-current network is adopted
Constant frequency control is used, working frequency is located near the resonant frequency of half-bridge resonance constant-current network.
Further, the half-bridge resonance constant-current network is based on CLCL type resonant network half bridge resonant transformers；It is described
Based on CLCL type resonant networks half bridge resonant transformer include switching tube S1, switching tube S2, electric capacity Cr, electric capacity Cs, inductance Lr,
Inductance Ls and transformer T1；The drain electrode of the switching tube S1 is connected with resonant network input voltage Uin positive poles, switching tube S1 source
Pole is connected with switching tube S2 drain electrode；Switching tube S2 source electrode is connected with voltage Uin negative poles；Electric capacity Cr one end and switching tube S2
Drain electrode connection；The electric capacity Cr other ends are connected with inductance Lr one end, electric capacity Cs one end respectively；The inductance Lr other ends and switching tube S2
Source electrode connection, the electric capacity Cs other ends are connected with inductance Ls one end；The inductance Ls other ends are connected with the primary one end of transformer T1；Become
The depressor T1 primary other ends are connected with the inductance Lr other ends；T1 level of transformer connects LED load；Assuming that transformer T1 magnetizing inductances
Lm is sufficiently large, ignores its influence to load current, then resonant network equivalent load electric current is：
Wherein ReqConvert equivalent to after the transformer T1 primary sides of CLCL type resonant network half bridge resonant transformers for LED load
Resistance；From formula (1) as can be seen that working asWhen, its output current peak valueWith load resistance ReqIt is unrelated,
Only relevant with input voltage and resonant parameter, resonant network is operated in constant current mode.
Further, the control circuit includes current sampling circuit, matrix current adjustment circuit, voltage sample circuit, voltage
Electric current compound circuit and voltage-regulating circuit；Matrix current adjustment circuit is by load current feedback signal, current reference and electric current
Error amplifier is constituted, for stablizing output current；Voltage x current compound circuit is by the sampled signal of PFC output voltages and load
Output signal of the electric current after matrix current adjustment circuit is combined, its result as voltage-regulating circuit voltage feedback signal；
Voltage-regulating circuit is made up of PFC output voltage feedback signals, voltage reference and voltage error amplifier, for controlling PFC
Output voltage.
Further, the pfc circuit uses Boost, is controlled by PFC control chips U1, and PFC output voltages take
Sample signal is obtained by resistance R7, R8 partial pressure；Half-bridge resonance constant-current circuit is by switching tube S1, S2, inductance Lr, Ls, electric capacity Cr, Cs
With transformer T1 compositions, switching tube S1, S2 are controlled by dutycycle for 0.5 complementary drive signals Vgs1 and Vgs2 respectively, half-bridge
Circuit is operated in the constant current area of resonant network；LED load is driven by two-way flow equalizing circuit, a route diode D6, electric capacity C9 and
LED2 is constituted, another route diode D5, electric capacity C0 and LED1 composition, and electric capacity C8 is the stream electric capacity that two paths of LED is loaded, Rs
For the sample resistance of LED1 electric currents；Circuit is controlled to control core by in-phase amplifier U4, error amplifier U3, subtracter U2 and PFC
Piece U1 is constituted；LED current sampled signal is compared after amplifying through in-phase amplifier U4 with reference signal Vref, through error amplifier
Subtract each other the voltage feedback signal as PFC control chips U1 with PFC output voltage sampled signals after U3, make PFC output voltages by
Voltage sampling signal and LED load electric current complex controll, it is achieved thereby that to the current constant control of LED.
The pfc circuit of the present invention is used to realize High Power Factor and voltage stabilizing, described half-bridge resonance constant-current network by with
Constant-current characteristics half-bridge resonance network composition, described control circuit by gathering PFC output voltages and LED load electric current, and
Both signals are subjected to composite feedback to control PFC output voltage, it is achieved thereby that the constant current control to the LED load
System.Have the advantages that simple control, efficiency high and constant current accuracy are high.
Brief description of the drawings
Fig. 1 is High Power Factor LED constant current driving power supply theory diagram of the present invention.
Fig. 2 is the half bridge resonant transformer based on CLCL type resonant networks.
Fig. 3 is the ac equivalent circuit of resonant network.
Output current and working frequency relation curve when Fig. 4 is different loads resistance.
Fig. 5 is High Power Factor LED constant current driving power supply circuit diagram of the embodiment of the present invention.
PFC output voltages and load current waveform when Fig. 6 is different resonant parameters.
Embodiment
Explanation is further explained to the present invention with specific embodiment below in conjunction with the accompanying drawings.
Referring to Fig. 1, the present invention provides a kind of High Power Factor LED constant current driving power supply, and it is humorous that it includes pfc circuit, half-bridge
Shake constant-current network, LED load and control circuit；Pfc circuit is flowed into after the rectified filtering of electric network source；Pfc circuit is exported and half
The input connection of bridge resonance constant-current network；The output of half-bridge resonance constant-current network connects LED load；The pfc circuit is by control circuit control
System；Control circuit by gathering pfc circuit output voltage and LED load electric current, and by both signals progress composite feedback with
PFC output voltage is controlled, the current constant control to the LED load is realized.
Half-bridge resonance constant-current network can be LCL resonance structures, CLC resonance structures and CLCL resonance structures.In resonance ginseng
In the case that number L, C are certain, LED load electric current is only relevant with PFC output voltages, in order to reduce the fluctuation of PFC output voltages and
The influence to output constant current precision such as resonant network parameter discrete, using PFC output voltages and LED load electric current composite feedback
Control method, by composite feedback control PFC output voltages so that LED load constant current hold.Present invention specific implementation
Half-bridge resonance constant-current network described in example is based on CLCL type resonant network half bridge resonant transformers.
Further, the pfc circuit uses Boost.
Referring to Fig. 1, it is multiple that control circuit includes current sampling circuit, matrix current adjustment circuit, voltage sample circuit, voltage x current
Close circuit and voltage-regulating circuit；LED load electric current is connected through current sampling circuit with matrix current adjustment circuit input；Electric current is adjusted
Whole circuit output is connected with the input of voltage x current compound circuit one；Pfc circuit output voltage is through voltage sample circuit and voltage electricity
Flow another input connection of compound circuit；Voltage x current compound circuit is exported to be connected with voltage-regulating circuit input；Voltage adjustment electricity
Road is exported for controlling pfc circuit output voltage.
The present invention also provides a kind of control method of High Power Factor LED constant current driving power supply, and there is provided a High Power Factor
LED constant current driving power supply, it includes pfc circuit, half-bridge resonance constant-current network, LED load and control circuit；Exported using PFC
The control method of voltage and LED load electric current composite feedback, controls pfc circuit output voltage so that LED is negative by composite feedback
Carry constant current hold；When output short-circuit and open circuit, pfc circuit output voltage control is between Vmin and Vmax, control electricity
The design on road needs to consider pfc circuit output voltage excursion；The half-bridge circuit of half-bridge resonance constant-current network uses constant frequency control
System, working frequency is located near the resonant frequency of half-bridge resonance constant-current network.
Further, the half-bridge resonance constant-current network is based on CLCL type resonant network half bridge resonant transformers；CLCL
Type resonant network half bridge resonant transformer circuit theory diagrams are referring to Fig. 2.It is described to be converted based on CLCL type resonant networks half-bridge resonance
Device includes switching tube S1, switching tube S2, electric capacity Cr, electric capacity Cs, inductance Lr, inductance Ls and transformer T1；The switching tube S1's
Drain electrode is connected with resonant network input voltage Uin positive poles, and switching tube S1 source electrode is connected with switching tube S2 drain electrode；Switching tube S2
Source electrode be connected with voltage Uin negative poles；Electric capacity Cr one end is connected with switching tube S2 drain electrode；The electric capacity Cr other ends respectively with inductance
Lr one end, the connection of electric capacity Cs one end；The inductance Lr other ends are connected with switching tube S2 source electrode, the electric capacity Cs other ends and inductance Ls
One end is connected；The inductance Ls other ends are connected with the primary one end of transformer T1；The transformer T1 primary other ends and the inductance Lr other ends
Connection；T1 level of transformer connects LED load；Assuming that transformer T1 magnetizing inductances Lm is sufficiently large, ignore its shadow to load current
Ring, Fig. 3 is Fig. 2 equivalent circuit.
Resonant network equivalent load electric current is：
(1)；
Wherein ReqConvert equivalent to after CLCL type resonant network half bridge resonant transformers T1 transformer primary side for LED load
Resistance；From formula (1) as can be seen that working asWhen, its output current peak valueWith load resistance ReqIt is unrelated, only
Relevant with input voltage and resonant parameter, resonant network is operated in constant current mode.Fig. 4 is the resonant network calculated by formula (1)
Output current IReqFrequency characteristic under correspondence different loads.As can be seen that in resonant frequency (constant current frequency) frNear,
The output current of different loads intersects at a point, and the output current of resonant network does not change with the change of load at this point,
Constant current output can be realized.
Further, the control circuit includes current sampling circuit, matrix current adjustment circuit, voltage sample circuit, voltage
Electric current compound circuit and voltage-regulating circuit；Matrix current adjustment circuit is by load current feedback signal, current reference and electric current
Error amplifier is constituted, for stablizing output current；Voltage x current compound circuit is by the sampled signal of PFC output voltages and load
Output signal of the electric current after matrix current adjustment circuit is combined, its result as voltage-regulating circuit voltage feedback signal；
Voltage-regulating circuit is made up of voltage feedback signal, voltage reference and voltage error amplifier, for controlling PFC output electricity
Pressure.
Fig. 5 is High Power Factor LED constant current driving power supply circuit diagram of the embodiment of the present invention.Pfc circuit is converted using Boost
Device, is controlled by PFC control chips U1, and PFC output voltages sampled signal is obtained by resistance R7, R8 partial pressure；Half-bridge constant current resonance electricity
Routing switch pipe S1, S2, inductance Lr, Ls, electric capacity Cr, Cs and transformer T1 compositions, switching tube S1, S2 are respectively by dutycycle
0.5 complementary drive signals Vgs1 and Vgs2 control, half-bridge circuit is operated in the constant current area of CLCL resonant networks, such as Fig. 4 dotted lines
Shown in frame.LED load is driven by two-way flow equalizing circuit, route D6, C9 and LED2 composition, another route D5, C0 and LED1 group
Into C8 is the stream electric capacity that two paths of LED is loaded, and Rs is the sample resistance of LED1 electric currents；Control circuit by in-phase amplifier U4,
Error amplifier U3, subtracter U2 and PFC control chip U1 are constituted.After LED current sampled signal amplifies through in-phase amplifier U4
Compared with reference signal Vref, subtracted each other after error amplifier U3 with PFC output voltage sampled signals as PFC control chips U1
Voltage feedback signal, make PFC output voltages by voltage sampling signal and LED load electric current complex controll, it is achieved thereby that right
The current constant control of LED.Fig. 6 is PFC output voltages and LED load current simulations waveform when resonant parameter changes, wherein it is visible,
When resonant parameter changes, PFC output voltages change therewith, but output current is held essentially constant, and realizes constant current.Wherein scheme
6a is Cs=10nF, Ls=258uH, Cr=3.3nF, Lr=500uH；Fig. 6 b are Cs=11nF, Ls=258uH, Cr=
3.3nF, Lr=500uH；Fig. 6 c are Cs=10nF, Ls=283uH, Cr=3.3nF, Lr=500uH.
Above is presently preferred embodiments of the present invention, all changes made according to technical solution of the present invention, produced function is made
During with scope without departing from technical solution of the present invention, protection scope of the present invention is belonged to.
Claims (8)
1. a kind of High Power Factor LED constant current driving power supply, it is characterised in that：Including pfc circuit, half-bridge resonance constant-current network,
LED load and control circuit；
Pfc circuit is flowed into after the rectified filtering of electric network source；Pfc circuit is exported to be connected with the input of half-bridge resonance constant-current network；Half
The output of bridge resonance constant-current network connects LED load；The pfc circuit is controlled by control circuit；Circuit is controlled by gathering pfc circuit
Output voltage and LED load electric current, and both signals are carried out composite feedback to control PFC output voltage, realize to institute
State the current constant control of LED load.
2. High Power Factor LED constant current driving power supply according to claim 1, it is characterised in that：The half-bridge resonance is permanent
Flow network is based on CLCL type resonant network half bridge resonant transformers.
3. High Power Factor LED constant current driving power supply according to claim 1, it is characterised in that：The pfc circuit is used
Boost.
4. High Power Factor LED constant current driving power supply according to claim 1, it is characterised in that：Circuit is controlled to include electricity
Flow sample circuit, matrix current adjustment circuit, voltage sample circuit, voltage x current compound circuit and voltage-regulating circuit；
LED load electric current is connected through current sampling circuit with matrix current adjustment circuit input；Matrix current adjustment circuit is exported and voltage electricity
Flow the input connection of compound circuit one；
Pfc circuit output voltage is connected through another input of voltage sample circuit and voltage x current compound circuit；
Voltage x current compound circuit is exported to be connected with voltage-regulating circuit input；Voltage-regulating circuit is exported for controlling PFC electricity
Road output voltage.
5. a kind of control method of High Power Factor LED constant current driving power supply, it is characterised in that：One High Power Factor LED is provided
Constant-current driving power supply, it includes pfc circuit, half-bridge resonance constant-current network, LED load and control circuit；
Using the control method of PFC output voltages and LED load electric current composite feedback, control pfc circuit defeated by composite feedback
Go out voltage so that LED load constant current hold；
When LED load short circuit and open circuit, pfc circuit output voltage control controls the design of circuit between Vmin and Vmax
Need the excursion of consideration pfc circuit output voltage；The half-bridge circuit of half-bridge resonance constant-current network is controlled using constant frequency, work
Frequency is located near the resonant frequency of half-bridge resonance constant-current network.
6. the control method of High Power Factor LED constant current driving power supply according to claim 5, it is characterised in that：It is described
Half-bridge resonance constant-current network is based on CLCL type resonant network half bridge resonant transformers；
It is described based on CLCL type resonant networks half bridge resonant transformer include switching tube S1, switching tube S2, electric capacity Cr, electric capacity Cs,
Inductance Lr, inductance Ls and transformer T1；The drain electrode of the switching tube S1 is connected with resonant network input voltage Uin positive poles, switch
Pipe S1 source electrode is connected with switching tube S2 drain electrode；Switching tube S2 source electrode is connected with voltage Uin negative poles；Electric capacity Cr one end is with opening
Close pipe S2 drain electrode connection；The electric capacity Cr other ends are connected with inductance Lr one end, electric capacity Cs one end respectively；The inductance Lr other ends are with opening
Pipe S2 source electrode connection is closed, the electric capacity Cs other ends are connected with inductance Ls one end；The inductance Ls other ends and the primary one end of transformer T1
Connection；The transformer T1 primary other ends are connected with the inductance Lr other ends；T1 level of transformer connects LED load；
Assuming that transformer T1 magnetizing inductances Lm is sufficiently large, ignore its influence to load current, then resonant network equivalent load electricity
Flow and be：
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Wherein ReqConverted for LED load to the equivalent electric after the transformer T1 primary sides of CLCL type resonant network half bridge resonant transformers
Resistance；From formula (1) as can be seen that working asWhen, its output current peak valueWith load resistance
ReqUnrelated, only relevant with input voltage and resonant parameter, resonant network is operated in constant current mode.
7. the control method of High Power Factor LED constant current driving power supply according to claim 5, it is characterised in that：
It is described control circuit include current sampling circuit, matrix current adjustment circuit, voltage sample circuit, voltage x current compound circuit with
And voltage-regulating circuit；
Matrix current adjustment circuit is made up of load current feedback signal, current reference and current error amplifier, defeated for stablizing
Go out electric current；Voltage x current compound circuit is defeated after matrix current adjustment circuit with load current by the sampled signal of PFC output voltages
Go out signal to be combined, its result as voltage-regulating circuit voltage feedback signal；Voltage-regulating circuit is by PFC output voltages
Feedback signal, voltage reference and voltage error amplifier composition, for controlling PFC output voltages.
8. the control method of High Power Factor LED constant current driving power supply according to claim 7, it is characterised in that：It is described
Pfc circuit uses Boost, is controlled by PFC control chips U1, PFC output voltages sampled signal is by resistance R7, R8 partial pressure
Obtain；Half-bridge resonance constant-current circuit is made up of switching tube S1, S2, inductance Lr, Ls, electric capacity Cr, Cs and transformer T1, switching tube
S1, S2 are controlled by dutycycle for 0.5 complementary drive signals Vgs1 and Vgs2 respectively, and half-bridge circuit is operated in the perseverance of resonant network
Flow area；LED load is driven by two-way flow equalizing circuit, a route diode D6, electric capacity C9 and LED2 composition, another route diode
D5, electric capacity C0 and LED1 composition, electric capacity C8 are the stream electric capacity that two paths of LED is loaded, and Rs is the sample resistance of LED1 electric currents；Control
Circuit is made up of in-phase amplifier U4, error amplifier U3, subtracter U2 and PFC control chip U1；LED current sampled signal is passed through
Compared after in-phase amplifier U4 amplifications with reference signal Vref, with PFC output voltage sampled signal phases after error amplifier U3
Subtract the voltage feedback signal as PFC control chips U1, make PFC output voltages multiple by voltage sampling signal and LED load electric current
Control is closed, it is achieved thereby that to the current constant control of LED.
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| CN108832810A (en) * | 2018-07-10 | 2018-11-16 | 哈尔滨工业大学（深圳） | The control method of volt-ampere of characteristic diode load power source |
| CN108990216A (en) * | 2018-08-31 | 2018-12-11 | 大连昌正光电科技有限公司 | A kind of LED lamp power supply device and its light-dimming method |
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| CN109618463A (en) * | 2019-01-07 | 2019-04-12 | 福州大学 | A kind of no electrolytic capacitor LED drive power light-dimming method |
| CN109618463B (en) * | 2019-01-07 | 2021-03-02 | 福州大学 | LED driving power supply dimming method without electrolytic capacitor |
| CN110149052B (en) * | 2019-05-10 | 2020-07-10 | 常熟理工学院 | Resonant circuit topology structure for battery charging |
| CN110149052A (en) * | 2019-05-10 | 2019-08-20 | 常熟理工学院 | A kind of resonant circuit topologies for battery charging |
| CN110634448B (en) * | 2019-08-23 | 2021-03-23 | 深圳康佳电子科技有限公司 | Backlight lamp strip protection circuit and TV set |
| CN110634448A (en) * | 2019-08-23 | 2019-12-31 | 深圳康佳电子科技有限公司 | Backlight lamp strip protection circuit and TV set |
| CN110536516A (en) * | 2019-09-27 | 2019-12-03 | 福州大学 | A kind of digital control method of no electrolytic capacitor LED drive power |
| CN110536517A (en) * | 2019-09-27 | 2019-12-03 | 福州大学 | A kind of single-stage isolated type no electrolytic capacitor LED drive power and its control method |
| CN110536516B (en) * | 2019-09-27 | 2021-11-30 | 福州大学 | Digital control method of LED driving power supply without electrolytic capacitor |
| CN110536517B (en) * | 2019-09-27 | 2022-04-08 | 福州大学 | Single-stage isolation type electrolytic capacitor-free LED driving power supply and control method thereof |
| CN112600429A (en) * | 2020-08-07 | 2021-04-02 | 青岛大学 | Single-stage single-phase wireless power transmission resonant converter and control strategy thereof |
| CN112187360A (en) * | 2020-10-30 | 2021-01-05 | 福州大学 | Average power feedback LED illumination visible light communication modulation method |
| CN112187360B (en) * | 2020-10-30 | 2022-04-01 | 福州大学 | Average power feedback LED illumination visible light communication modulation method |
| CN113162453A (en) * | 2021-04-20 | 2021-07-23 | 哈尔滨工业大学 | High-frequency inversion system and control method |
| CN113162453B (en) * | 2021-04-20 | 2022-11-29 | 哈尔滨工业大学 | High-frequency inversion system and control method |
| CN113224945A (en) * | 2021-04-29 | 2021-08-06 | 北京机械设备研究所 | Topological structure of DC/DC power converter cascaded by Buck + CLCL resonant converters |
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