CN205546121U - Prevent LED drive circuit of scintillation - Google Patents
Prevent LED drive circuit of scintillation Download PDFInfo
- Publication number
- CN205546121U CN205546121U CN201521124162.2U CN201521124162U CN205546121U CN 205546121 U CN205546121 U CN 205546121U CN 201521124162 U CN201521124162 U CN 201521124162U CN 205546121 U CN205546121 U CN 205546121U
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- CN
- China
- Prior art keywords
- circuit
- outfan
- pfc
- vcc
- led drive
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model relates to a LED drive circuit field, in particular to prevent LED drive circuit of scintillation, the control chip U1's of the PFC circuit of this circuit VCC end is directly got from auxiliary power supply circuit, LLC chip U2's VCC end is from getting from auxiliary power circuit through delay circuit, therefore, the LLC circuit obtains operating voltage in the PFC circuit slowly, as long as reasonable adjustment delay time, just can go to report the LLC circuit to start in the PFC circuit slowly, consequently can ensure that this drive circuit can not be because of the LLC circuit prior to the work of PFC circuit and lead to the scintillation.
Description
Technical field
This utility model relates to LED drive circuit field, particularly to the LED drive circuit of a kind of anti-flicker.
Background technology
At present, LED has energy-saving and environmental protection, life-span length, light efficiency advantages of higher because of it, is used widely at lighting field.During the popularization and application of LED illumination, owing to LED lamp bead is higher to the stability requirement of electric current, therefore it is generally required to it is driven by special drive circuit, but, the design of LED drive circuit also exists some crucial problem the most always to be had: (1) drives power-efficient not high enough, and power factor is the most undesirable；(2) on the high side, drive circuit is complicated, and reliability is low.Controlling to drive power supply instability is the main cause causing LED life to reduce.
nullFor this，Propose in the industry multiple solution，Such as，" modern display " has been delivered the article of entitled " HB_LED based on _ PFC_LLC_CV_CC_ topological structure drives Power Management Design " in October, 2011 (total 129 phases) and has i.e. been disclosed the complete machine topology design structure of " PFC+ half-bridge logical link control (LLC) resonant+Xiao's superfine rectification+constant current constant voltage "，This structure obtains widespread adoption due to its high reliability and high stability，In this topology, PFC (power factor correction) circuit and LLC resonance circuit are most crucial circuit blocks，The core of the two circuit is L6563 chip (pfc controller) and L6599 chip (LLC controller) the most respectively，In actual applications，Circuit needs a reserved feeder ear (system power supply end VCC) to power for pfc controller，This feeder ear is then by the power-supply circuit input power taking from PFC.Find through using, there are serious problems in this structure: owing to pfc circuit and LLC circuit obtain running voltage from same power supply, two chips can work simultaneously the most in theory, but in some special cases, LLC circuit may work prior to pfc circuit, owing to LLC circuit is subordinate's circuit of pfc circuit, if LLC circuit first works, then whole circuit can be caused to be in flicker state.
Utility model content
The purpose of this utility model is to avoid above-mentioned weak point of the prior art to provide a kind of and can prevent because LLC circuit causes the LED drive circuit of flicker prior to pfc circuit work.
The purpose of this utility model is achieved through the following technical solutions:
The LED drive circuit of a kind of anti-flicker is provided, including main circuit, described main circuit includes pfc circuit and LLC translation circuit, described pfc circuit includes control chip U1, described LLC translation circuit includes LLC chip U2, also include from described PFC input side power taking the auxiliary power supply circuit that provides VCC voltage for main circuit, the VCC end of described control chip U1 from the direct power taking of auxiliary power supply circuit, the VCC end of described LLC chip U2 from through delay circuit from auxiliary power circuit power taking.
Wherein, also include storage capacitor, connect between described pfc circuit and storage capacitor and have resistance R46, the two ends of described resistance R46 are parallel with gate-controlled switch, this LED drive circuit also include from described PFC input side power taking and for main circuit provide VCC voltage auxiliary power supply circuit, described auxiliary power supply circuit includes for exporting the VCC outfan of VCC voltage and being connected to the SCR outfan of gate-controlled switch controlled end, during this drive circuit initial turn-on, described gate-controlled switch is off, so that described pfc circuit is storage capacitor charging through resistance R46, when the magnitude of voltage of the VCC outfan of described auxiliary power supply circuit rises to VCC magnitude of voltage, SCR outfan triggers signal in output makes gate-controlled switch turn on.
Wherein, described auxiliary power supply circuit includes that voltage stabilizing chip U3, described voltage stabilizing chip U3 use LNK564DN formula chip.
Wherein, described auxiliary power supply circuit includes transformator T2, transformator T2 includes primary main winding, primary auxiliary winding and secondary windings, described voltage stabilizing chip U3 controls the electric current of the primary main winding of transformator T2 thus regulates primary auxiliary winding and the voltage of secondary windings of transformator T2, and, the outfan of primary auxiliary winding is as VCC outfan, and the outfan of secondary windings is as SCR outfan.
Wherein, described pfc circuit is interactive pfc circuit.
Wherein, described main circuit is sequentially connected with from input to outfan EMC filter circuit, current rectifying and wave filtering circuit, interactive pfc circuit, LLC translation circuit and output voltage stabilizing circuit.
Wherein, described interactive pfc circuit includes the switching branches of two-way parallel connection and for double switch branch road carries out the control chip U1 of on-off control, and described switching branches from the outfan power taking of a current rectifying and wave filtering circuit and is charged to storage capacitor.
The beneficial effects of the utility model: the VCC end of the control chip U1 of pfc circuit of the present utility model is from the direct power taking of auxiliary power supply circuit, the VCC end of LLC chip U2 from through delay circuit from auxiliary power circuit power taking, therefore, LLC circuit is slower than pfc circuit and obtains running voltage, if reasonable adjusting delay time, just can go to report LLC circuit to be slower than pfc circuit to start, therefore, it is possible to guarantee that this drive circuit will not cause flicker because of LLC circuit prior to pfc circuit work.
Accompanying drawing explanation
The utility model is described in further detail to utilize accompanying drawing, but the embodiment in accompanying drawing does not constitute any restriction of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to the following drawings.
Fig. 1 is electrical block diagram of the present utility model.
Fig. 2 is pfc circuit of the present utility model and LLC translation circuit structural representation.
Fig. 3 is delay circuit structural representation of the present utility model.
Fig. 4 is auxiliary power supply electrical block diagram of the present utility model.
Fig. 1 to Fig. 4 includes:
1 EMC filter circuit, 2 LLC translation circuits, 3 main circuits, 31 interactive pfc circuits, 32 storage capacitors, 33 switching branches, 4 output voltage stabilizing circuits, 5 auxiliary power circuits, 6 constant pressure and flow regulation circuit, 7 delay circuits, 8 auxiliary power supply circuit, 9 current rectifying and wave filtering circuits.
Detailed description of the invention
With the following Examples this utility model is further described.
The detailed description of the invention of the LED drive circuit of this utility model width dimming scope, as shown in Figure 1 and Figure 4, main circuit and the auxiliary power supply circuit 8 for main circuit offer running voltage (VCC voltage), 1, current rectifying and wave filtering circuit 9 of the EMC filter circuit that described main circuit 3 is sequentially connected with from input to outfan, interactive pfc circuit 31, LLC translation circuit 2 and output voltage stabilizing circuit 4.
Wherein, interactive pfc circuit includes the switching branches 33 of two-way parallel connection and for the control chip U1 being controlled double switch branch road, first via switching branches includes inductance L3 and diode D6, inductance L3 one end is from the outfan power taking of a current rectifying and wave filtering circuit, the other end charges to storage capacitor through diode D6, the connection end of inductance L3 and diode D6 is through switching tube Q11 ground connection, chip U1 controls the conduction and cut-off of switching tube Q11, so that inductance L3 toggles under charge/discharge state.Second way switch branch road includes L4 and diode D7, inductance L4 one end is from the outfan power taking of a current rectifying and wave filtering circuit 9, the other end charges to storage capacitor through diode D7, the connection end of inductance L4 and diode D7 is through switching tube Q12 ground connection, chip U1 controls the conduction and cut-off of switching tube Q12, so that inductance L4 toggles under charge/discharge state.Control chip U1 uses UCC28061D cake core, the control signal of control chip U1 output high frequency time, so that audion Q11 and audion Q12 is under high-frequency work state, the voltage making 33 current rectifying and wave filtering circuit 9 outfan frequencies of double switch branch road relatively low is converted to HF switch pulse, thus reduces the voltage ripple of storage capacitor.And control chip U1 is 180 ° by controlling the phase contrast of the inductance ripple current that switching tube Q11 and Q12 makes inductance L3 and L4 produce, and inductance ripple current is cancelled out each other, so reducing the inductance ripple current produced by boost inductance.
nullWherein，Auxiliary power supply circuit 8 is from the input HV power taking of interactive pfc circuit 31，Voltage stabilizing chip U3 is used to export to main circuit after carrying out voltage stabilizing，Voltage stabilizing chip U3 uses LNK564DN formula chip，This chip controls the electric current of primary main winding in transformator T2 by the control signal that its end foot 4 exports，Thus regulate primary auxiliary winding and the voltage of secondary windings of transformator，Wherein the outfan of primary auxiliary winding is as VCC outfan，For providing running voltage (VCC voltage) to each control chip of main circuit 3，The outfan of secondary windings exports SRC signal to main circuit as SCR outfan，Pfc circuit and storage capacitor assembly at main circuit 3 are provided with resistance R46，The two ends of resistance R46 are parallel with controllable silicon，Aforementioned SRC signal is used for triggering controlled silicon conducting.nullThe present embodiment uses relatively independent auxiliary power circuit 8，Therefore the running voltage of each chip of main circuit will not be affected by the duty of interactive the pfc circuit 31 and LLC translation circuit 2 of main circuit，And，When circuit start，Resistance R46 can carry out current limliting to the charging process of storage capacitor 32，So that more electric energy is assigned to auxiliary power circuit 8，The outfan enabling auxiliary power supply circuit 8 rapidly reaches VCC magnitude of voltage requirement，So that each chip module of main circuit 3 rapidly enters duty，This is the most especially beneficial，Because the electric current that low temperature environment is easily caused each device of power supply rises slowly，Circuit is difficult to start，Electric energy more can be assigned in power supply by this circuit in the initial start stage of circuit，So that it is guaranteed that circuit also is able to effectively at low ambient temperatures，Quickly start up.And after circuit start, by controlling controlled silicon conducting, the resistance R4 impact on charging can be eliminated again, improve the work efficiency of drive circuit.
In the present embodiment, the working power end of the Master control chip U2 of LLC translation circuit 2 through delay circuit 7 from the VCC outfan power taking of auxiliary power circuit 8, so that it is guaranteed that LLC circuit 2 just starts after interactive pfc circuit 31 starts, avoid LLC translation circuit 2 first to start with interactive pfc circuit 31 and cause the unstable problem of main circuit 3 output signal, it is to avoid the flicker of LED.
Finally should be noted that; above example is only in order to illustrate the technical solution of the utility model; rather than the restriction to this utility model protection domain; although having made to explain to this utility model with reference to preferred embodiment; it will be understood by those within the art that; the technical solution of the utility model can be modified or equivalent, without deviating from the spirit and scope of technical solutions of the utility model.
Claims (7)
1. the LED drive circuit of an anti-flicker, including main circuit, described main circuit includes pfc circuit and LLC translation circuit, described pfc circuit includes control chip U1, described LLC translation circuit includes LLC chip U2, it is characterized in that: also include from described PFC input side power taking the auxiliary power supply circuit that provides VCC voltage for main circuit, the VCC end of described control chip U1 from the direct power taking of auxiliary power supply circuit, the VCC end of described LLC chip U2 from through delay circuit from auxiliary power circuit power taking.
nullThe LED drive circuit of anti-flicker the most as claimed in claim 1，It is characterized in that: also include storage capacitor，Connect between described pfc circuit and storage capacitor and have resistance R46，The two ends of described resistance R46 are parallel with gate-controlled switch，This LED drive circuit also include from described PFC input side power taking and for main circuit provide VCC voltage auxiliary power supply circuit，Described auxiliary power supply circuit includes for exporting the VCC outfan of VCC voltage and being connected to the SCR outfan of gate-controlled switch controlled end，During this drive circuit initial turn-on，Described gate-controlled switch is off，So that described pfc circuit is storage capacitor charging through resistance R46，When the magnitude of voltage of the VCC outfan of described auxiliary power supply circuit rises to VCC magnitude of voltage，SCR outfan triggers signal in output makes gate-controlled switch turn on.
The LED drive circuit of anti-flicker the most as claimed in claim 2, it is characterised in that: described auxiliary power supply circuit includes that voltage stabilizing chip U3, described voltage stabilizing chip U3 use LNK564DN formula chip.
The LED drive circuit of anti-flicker the most as claimed in claim 3, it is characterized in that: described auxiliary power supply circuit includes transformator T2, transformator T2 includes primary main winding, primary auxiliary winding and secondary windings, described voltage stabilizing chip U3 controls the electric current of the primary main winding of transformator T2 thus regulates primary auxiliary winding and the voltage of secondary windings of transformator T2, and, the outfan of primary auxiliary winding is as VCC outfan, and the outfan of secondary windings is as SCR outfan.
The LED drive circuit of anti-flicker the most as claimed in claim 1, it is characterised in that: described pfc circuit is interactive pfc circuit.
The LED drive circuit of anti-flicker the most as claimed in claim 5, it is characterised in that: EMC filter circuit that described main circuit is sequentially connected with from input to outfan, current rectifying and wave filtering circuit, interactive pfc circuit, LLC translation circuit and output voltage stabilizing circuit.
The LED drive circuit of anti-flicker the most as claimed in claim 6, it is characterized in that: described interactive pfc circuit includes the switching branches of two-way parallel connection and for double switch branch road carries out the control chip U1 of on-off control, described switching branches from the outfan power taking of a current rectifying and wave filtering circuit and is charged to storage capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521124162.2U CN205546121U (en) | 2015-12-31 | 2015-12-31 | Prevent LED drive circuit of scintillation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521124162.2U CN205546121U (en) | 2015-12-31 | 2015-12-31 | Prevent LED drive circuit of scintillation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205546121U true CN205546121U (en) | 2016-08-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521124162.2U Expired - Fee Related CN205546121U (en) | 2015-12-31 | 2015-12-31 | Prevent LED drive circuit of scintillation |
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| Country | Link |
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| CN (1) | CN205546121U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108055733A (en) * | 2017-12-29 | 2018-05-18 | 深圳市华星光电技术有限公司 | A kind of driving circuit and lighting system |
-
2015
- 2015-12-31 CN CN201521124162.2U patent/CN205546121U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108055733A (en) * | 2017-12-29 | 2018-05-18 | 深圳市华星光电技术有限公司 | A kind of driving circuit and lighting system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160831 Termination date: 20181231 |
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| CF01 | Termination of patent right due to non-payment of annual fee |