CN204291485U - LED power drive unit - Google Patents
LED power drive unit Download PDFInfo
- Publication number
- CN204291485U CN204291485U CN201420745593.XU CN201420745593U CN204291485U CN 204291485 U CN204291485 U CN 204291485U CN 201420745593 U CN201420745593 U CN 201420745593U CN 204291485 U CN204291485 U CN 204291485U
- Authority
- CN
- China
- Prior art keywords
- diode
- fast recovery
- resistance
- recovery diode
- electric capacity
- Prior art date
- 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.)
- Active
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model proposes a kind of LED power drive unit, this LED power drive unit comprises: protective circuit; Rectification circuit, rectification circuit is connected with ballast by protective circuit, and rectification circuit comprises fast recovery diode; LC filter circuit, LC filter circuit is connected with rectification circuit; Circuit of power factor correction, circuit of power factor correction is connected with LC filter circuit; Conversion switch, the input of conversion switch is connected with circuit of power factor correction, and the output of conversion switch is connected with LED, conversion switch output drive signal to LED with driving LED work.LED power drive unit of the present utility model, can compatible ballast, be applied to EMC engineered in do not need to remove original electronics or Inductive ballast, meet high-frequency ac crest voltage ability to bear, voltage dispersion be little, fluctuate little.
Description
Technical field
The utility model relates to light emitting device technologies field, particularly a kind of LED power drive unit.
Background technology
The high-frequency alternating current that electric ballast or Inductive ballast export can be converted to the constant-current supply needed for LED lamp tube by driving power, driving power can compatible international top-brand electric ballast and Inductive ballast and driving LED fluorescent tube normally works, at EMC (Energy Management Contract, Energy Management Contract) engineered in, driving power can meet large hotel, hotel, factory, exhibition etc. and changes LED lamp tube and need not remove and retain the requirement of the illuminating product of original ballast.At present, the period planning of incandescent lamp is abrogated in the corresponding appearance in various countries, and such as, China also will replace all incandescent lamps before 2017, the substitute is the LED illumination lamp using energy-conserving and environment-protective.The developed country such as American-European, Japanese has started to substitute energy-saving LED illumination at present especially, and LED lamp tube has realized civil power and directly used, without the need to accessing electric ballast or Inductive ballast.
But, the ballast of incandescent lamp, fluorescent lamp and the power supply of LED lamp tube incompatible, if be replaced by LED lamp tube, need change circuit, remove ballast, and in large-scale hotel, hotel, factory, exhibition central whole change in temporary substitute journey (EMC), the dismounting of a series of electric ballast originally installed or sense ballast, change and will spend a large amount of money.In addition, general power driving circuit is after connection electric ballast, and due to the high-frequency alternating current power frequency of electric ballast, circuit exists the large problem of voltage dispersion type, and when driving LED light source, fluctuation ratio is larger.
Utility model content
The utility model is intended to solve one of above-mentioned technical problem at least to a certain extent.For this reason, the utility model needs to propose a kind of LED power drive unit, and this LED power drive unit can compatible ballast, be applied to EMC engineered in do not need to remove original electronics or Inductive ballast, meet high-frequency ac crest voltage ability to bear, voltage dispersion be little, fluctuate little.
For solving the problem, the utility model proposes a kind of LED power drive unit, this LED power drive unit comprises: protective circuit, and described protective circuit comprises first to fourth protective tube; Rectification circuit, described rectification circuit is connected with ballast by protective circuit, and described rectification circuit comprises fast recovery diode;
LC filter circuit, described LC filter circuit is connected with described rectification circuit; Circuit of power factor correction, described circuit of power factor correction is connected with described filter circuit; Conversion switch, the input of described conversion switch is connected with described circuit of power factor correction, and the output of described conversion switch is connected with LED, and described conversion switch output drive signal works to described LED to drive described LED.
According to LED power drive unit of the present utility model, by the rectification circuit comprising fast recovery diode, rectification is carried out to the high-frequency alternating current that ballast exports, high-frequency ac crest voltage ability to bear can be met, voltage dispersion is little, and then carry out by LC filter circuit the fluctuation that filtering can reduce circuit, reduce ballast power frequency to the impact of circuit.In addition, the device of the utility model embodiment can compatible electromagnetism ballast or circuit of electronic ballast, the high-frequency ac voltage driving LED light source that ballast exports can be connected, therefore in the transformation of some EMC heavy constructions, do not need to remove original electric ballast or electromagnetic ballast, more convenient, cost saving.
The aspect that the utility model is additional and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present utility model.
Accompanying drawing explanation
The utility model above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the block diagram of the LED power drive unit according to an embodiment of the present utility model;
Fig. 2 is the circuit diagram of the LED power drive unit according to a specific embodiment of the present utility model.
Embodiment
Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the utility model, and can not being interpreted as restriction of the present utility model.
Disclosing hereafter provides many different embodiments or example is used for realizing different structure of the present utility model.Of the present utility model open in order to simplify, hereinafter the parts of specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the utility model.In addition, the utility model can in different example repeat reference numerals and/or letter.This repetition is to simplify and clearly object, itself does not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique that the utility model provides and the example of material, but those of ordinary skill in the art can recognize the property of can be applicable to of other techniques and/or the use of other materials.
With reference to description below and accompanying drawing, by these and other aspects of clear embodiment of the present utility model.In these descriptions and accompanying drawing, specifically disclose some particular implementation in embodiment of the present utility model, represent some modes of the principle implementing embodiment of the present utility model, but should be appreciated that the scope of embodiment of the present utility model is not limited.On the contrary, embodiment of the present utility model comprise fall into attached claims spirit and intension within the scope of all changes, amendment and equivalent.
The LED power drive unit proposed according to the utility model embodiment is described with reference to the accompanying drawings.
Fig. 1 is the block diagram of the LED power drive unit according to an embodiment of the present utility model.As shown in Figure 1, the LED power drive unit 1000 of the utility model embodiment comprises rectification circuit 100, LC filter circuit 200, circuit of power factor correction 300 and conversion switch 400.
Wherein, rectification circuit 100 is connected with ballast 10, and as shown in Figure 1, rectification circuit 100 is connected with L2 respectively with four outputs N1, L1, N2 of electric ballast, and the high-frequency alternating current that electric ballast exports is carried out rectification, and rectification is direct current.Further, rectification circuit 100 comprises fast recovery diode, the anti-phase recovery time of fast recovery diode is shorter, such as reverse recovery time is 75us (microsecond), rectification circuit 100 adopts fast recovery diode to carry out rectification, the ability to bear of high-frequency ac crest voltage can be met, reduce the discreteness of rectification high-frequency cycle generation.
In one embodiment of the invention; LED power drive unit 1000 also comprises protective circuit; described rectification circuit is connected with ballast by protective circuit; protective circuit comprises first to fourth protective tube; that is, protective circuit comprises the first protective tube, the second protective tube, the 3rd protective tube and the 4th protective tube.
LC filter circuit 200 is connected with rectification circuit 100, the interference letter wave component that filtering can reduce voltage or electric current in circuit is carried out by LC filter circuit 200, prevent operating current from suddenling change and producing peak interference electric current, thus the fluctuation of circuit can be reduced, reduce electric ballast power frequency to the impact of circuit.
Circuit of power factor correction 300 is connected with filter circuit 200, such as, adopts passive PFC (Power FactorCorrection, power factor correction), can correct, and improve harmonic distortion amount to voltage.
The input of conversion switch 400 is connected with circuit of power factor correction 300, and the output of conversion switch 300 is connected with LED, conversion switch 400 output drive signal to LED with driving LED work.
Below each several part circuit of the LED power drive unit 1000 to the utility model embodiment is described in detail.
Wherein, in embodiment of the present utility model, the rectifier bridge that rectification circuit 100 adopts fast recovery diode to form carries out rectification to the high-frequency alternating current that ballast 10 exports.Particularly, as shown in Figure 2, be the circuit diagram of the LED power drive unit according to a specific embodiment of the present utility model, rectification circuit 100 specifically comprises the first rectifier bridge and the second rectifier bridge.
Particularly, the first rectifier bridge comprises the first fast recovery diode D11, the second fast recovery diode D12, the 3rd fast recovery diode D13 and the 4th fast recovery diode D14.Wherein, one end of the first fast recovery diode D11 is connected with the first output such as N1 of ballast 10, or the one end as the first fast recovery diode D11 in Fig. 2 is connected by the first protective tube F1 and N1; One end of second fast recovery diode D12 is connected with the other end of the first fast recovery diode D11, between one end of second fast recovery diode D12 and the other end of the first fast recovery diode D11, there is first node O1, first node O1 ground connection, the other end of the second fast recovery diode D12 is connected with the second output such as L1 of ballast 10, or the other end as the second fast recovery diode D12 in Fig. 2 is connected by the second protective tube F2 and L1; One end of 3rd fast recovery diode D13 is connected with the first output such as N1 of ballast 10, or the one end as the 3rd fast recovery diode D13 in Fig. 2 is connected by the first protective tube F1 and N1; One end of 4th fast recovery diode D14 is connected with the other end of the 3rd fast recovery diode D13, between one end of 4th fast recovery diode D14 and the 3rd fast recovery diode D13, there is Section Point O2, Section Point O2 is connected with LC filter circuit 200, the other end of the 4th fast recovery diode D14 is connected with the second output such as L1 of ballast 10, or the other end as the 4th fast recovery diode D14 in Fig. 2 is connected by the second protective tube F2 and L1.
Particularly, the second rectifier bridge comprises the 5th fast recovery diode D15, the 6th fast recovery diode D16, the 7th fast recovery diode D17 and the 8th fast recovery diode D18.Wherein, one end of the 5th fast recovery diode D15 is connected with the 3rd output of ballast 10, or connects as the 5th fast recovery diode D15 in Fig. 2 passes through the 3rd protective tube F3 and N2; One end of 6th fast recovery diode D16 is connected with the other end of the 5th fast recovery diode D15, between one end of 6th fast recovery diode D16 and the other end of the 5th fast recovery diode D15, there is the 3rd node O3,3rd node O3 ground connection, the other end of the 6th fast recovery diode D16 is connected with the 4th output of ballast 10, or as in Fig. 2, the 6th fast recovery diode D16 is connected by the 4th protective tube F4 and L2; One end of 7th fast recovery diode D17 is connected with the 3rd output such as N2 of ballast 10, or the one end as the 7th fast recovery diode D17 in Fig. 2 is connected with N2 by the 3rd protective tube; One end of 8th fast recovery diode D18 is connected with the other end of the 7th fast recovery diode D17, between one end of 8th fast recovery diode D18 and the other end of the 7th fast recovery diode D17, there is the 4th node O4,4th node O4 is connected with LC filter circuit 200, the other end of the 8th fast recovery diode D18 is connected with the 4th output such as L2 of ballast 10, or the other end as the 8th fast recovery diode D18 in Fig. 2 is connected with L2 by the 4th protective tube.
In the LED power drive circuit 1000 of the utility model embodiment, the rectification circuit 100 that the high-frequency alternating current that ballast 10 exports forms via 8 fast recovery diodes carries out rectification, because the diode Loss reducing that the high-frequency cycle must use recovery time extremely short in short-term, such as adopt be the diode of 75us reverse recovery time, rectification is carried out to the high-frequency alternating current of the 120KHz that ballast 10 exports.
In addition, rectification circuit 100 also comprises the first electric capacity C1 and the second electric capacity C2.Wherein, one end of the first electric capacity C1 is connected with the first output such as N1 of ballast 10, and the other end of the first electric capacity C1 is connected with the second output such as L1 of ballast 10; One end of second electric capacity C2 is connected with the 3rd output such as N2 of ballast 10, and the other end of the second electric capacity C2 is connected with the 4th output such as L2 of ballast 10.Or as shown in Figure 2, one end of the first electric capacity C1 is connected with the first output such as N1 of ballast 10 by the first protective tube F1, and the other end of the first electric capacity C1 is connected with the second output such as L1 of ballast 10 by the second protective tube F2; One end of second electric capacity C2 is connected with the 3rd output such as N2 of ballast 10 by the 3rd protective tube F3, and the other end of the second electric capacity C2 is connected with the 4th output such as L2 of ballast 10 by the 4th protective tube F4.
As shown in Figure 2, LC filter circuit 200 specifically comprises the first inductance L 1 and the 3rd electric capacity C3.Wherein, one end of the first inductance L 1 is connected with the 4th node O4 respectively with Section Point O2; One end ground connection of the 3rd electric capacity C3, the other end of the 3rd electric capacity C3 is connected with the other end of the first inductance L 1, and have the 5th node O5 between the other end of the 3rd electric capacity C3 and the other end of the first inductance L 1, the 5th node O5 is connected with circuit of power factor correction 300.LC filter circuit 200 can prevent operating current from suddenling change and producing peak interference electric current, reduces circuit fluctuation.
In the embodiment of utility model, as shown in Figure 2, circuit of power factor correction 300 can adopt passive type, and particularly, circuit of power factor correction 300 comprises the first diode D1, the second diode D2, the 3rd diode D3, the 4th electric capacity C4 and the 5th electric capacity C5.Wherein, one end ground connection of the first diode D1; One end of second diode D2 is connected with the other end of the first diode D1, has the 6th node O6 between one end of the second diode D2 and the other end of the first diode D1; One end of 3rd diode D3 is connected with the other end of the second diode D2, have the 7th node O7 between one end of 3rd diode D3 and the other end of the second diode D2, the other end of the 3rd diode D3 is connected with the 5th node O5 and switch conversion circuit 400 respectively; One end of 4th electric capacity C4 is connected with the 5th node O5, and the other end of the 4th electric capacity C4 is connected with the 6th node O6; One end of 5th electric capacity C5 is connected with one end of the first diode D1, and the other end of the 5th electric capacity C5 is connected with the 7th node O7.
Wherein, the 4th electric capacity C4 and the 5th electric capacity C5 can calculate according to the following formula:
wherein, C
minfor the capacitance of C4 or C5, I
lEDfor load LED lamp bead total current value (mA), V
lEDfor load LED lamp bead total voltage value (V), V
infor input voltage value (V).
Can voltage correction be carried out to alternating current by circuit of power factor correction 300 and then improve harmonic distortion.
Particularly, as shown in Figure 2, conversion switch 400 comprises start unit 410, control unit 420, switch element 430, current sense feedback unit 440 and output unit 450.
Wherein, start unit 410 is connected with the other end of the 3rd diode D3, and control unit 420 is connected with start unit 410, and such as, start unit 410 comprises the first resistance R1 and the second resistance R2, and one end of the first resistance R1 is connected with the other end of the 3rd diode D3; One end of second resistance R2 is connected with the other end of the first resistance R1, and the other end of the second resistance R2 is connected with control unit 420.Because after inductance, electric current and voltage can not suddenly change, in order to voltage, the electric current of stable input, by after start unit 410 step-down that is made up of the first resistance R1 and the second resistance R2 for control unit 420 provides operating voltage, electric current.Such as, in Fig. 2, control unit 420 is that first pin of chip U1, U1 is connected with start unit 410, and wherein, R1 and R2 can get 20K Ω.
Switch element 430 is connected with control unit 420, and further, switch element 430 comprises the 3rd resistance R3 and the 4th diode D4, switching tube Q1 and the 4th resistance R4.3rd resistance R3 is in parallel with the 4th diode D4, and one end of the 3rd resistance R3 is all connected with control unit 420 with one end of the 4th diode D4, and the 4th diode D4 can be 4148 paster pipes; Switching tube Q1 is MOSFET ((Metal-Oxide-SemU1onductor Field-EffectTransistor such as, metal-oxide half field effect transistor) first end such as grid be connected with the other end of the 3rd resistance R3 and the other end of the 4th diode D4 respectively, second end of switching tube Q1 is connected with current sense feedback unit 440, and the 3rd end of switching tube Q1 is connected with output unit 450; One end of 4th resistance R4 is connected with control unit 420, and the other end of the 4th resistance R4 is connected with one end of the 3rd resistance R3 and one end of the 4th diode D4 respectively.Particularly, as shown in Figure 2, the 4th pin 4 of control unit 420 such as U1 chip is connected with the grid of MOSFET pipe with the 4th diode D4 by the 3rd resistance R3, and U1 outputting drive voltage driving switch pipe Q1 works.8th pin 8 of U1 is turn-off time programming pin, and be connected with the 4th resistance R4, can set the control of the turn-off time of switch tube Q1, wherein, the 4th resistance R4 and turn-off time meet following formula:
wherein, T
offfor the turn-off time, unit us (microsecond).
Such as, the 4th resistance R4 can value 360K Ω.
Current sense feedback unit 440 is connected with control unit 420 and switch element 430 respectively, and current sense feedback unit 440 comprises the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7.One end of 5th resistance R5 is connected with second end of control unit 420 and switching tube Q1 respectively, the other end ground connection of the 5th resistance R5; One end of 6th resistance R6 is connected with second end of control unit 420 and switching tube Q1 respectively, the other end ground connection of the 6th resistance R6; One end of 7th resistance R7 is connected with second end of control unit 420 and switching tube Q1 respectively, the other end ground connection of the 7th resistance R7.Such as shown in Fig. 2, second pin two of U1 and the drain electrode of switching tube Q1 are connected with one end of the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7 respectively, if setting reference voltage is 25Mv (millivolt), the resistance of the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7 can according to following formulae discovery:
wherein, R
cSfor the resistance of R5 or R6 or R7, I is inductance peak current, I
lEDfor load LED lamp bead total current value (mA).
Output unit 450 is connected with switch element 430 and LED respectively, output unit output drive signal, with driving LED work.Particularly, output unit 450 comprises the second inductance L 2, the 5th diode D5 and the 6th diode D6, the 6th electric capacity C6.One end of second inductance L 2 and the three-terminal link of switching tube Q1, the other end of the second inductance L 2 is connected with one end such as LED-of LED; One end of 5th diode D5 is connected with the 3rd end of switching tube Q1 and one end of the second inductance L 2 respectively, the other end of the 5th diode D5 is connected with the other end such as LED+ of LED, one end of 6th diode D6 is connected with the 3rd end of switching tube Q1 and one end of the second inductance L 2 respectively, and the other end of the 6th diode D6 is connected with the other end such as LED+ of LED; One end of 6th electric capacity C6 is connected with one end of LED, and the other end of the 6th electric capacity C6 is connected with the other end of LED.Such as shown in Fig. 2, wherein, the inductance value of the second inductance L 2 can be calculated by following formula:
wherein, V
infor input voltage value (V), V
lEDfor load LED lamp bead total voltage value (V), T
onfor the opening time of switching tube Q1, R
oscfor oscillation resistance,
Wherein, opening time T
onobtained by following formula:
wherein, D is duty ratio, f
oscfor frequency of oscillation,
Wherein, duty ratio computing formula is:
In addition, in embodiment of the present utility model, as shown in Figure 2, conversion switch 400 also comprises PWM (PulseWidth Modulation, pulse width modulation) dimming unit 460.PWM light adjusting circuit 460 comprises the 8th resistance R8 and the 7th electric capacity C7.One end of 8th resistance R8 is connected with control unit 420; One end of 7th electric capacity C7 is connected with the other end of the 8th resistance R8, and have the 8th node O8 between one end of the 7th electric capacity C7 and the other end of the 8th resistance R8, the 8th node O8 is connected with control unit 420, the other end ground connection of the 7th electric capacity C7.Such as shown in Fig. 2, the 5th pin of chip U1 is connected with one end of the 8th resistance R8, and the other end of the 6th pin of U1, the 7th pin and the 8th resistance R8 is connected with one end of the 7th electric capacity C7, and wherein, the 7th electric capacity C7 can play the effect of stable VCC voltage.Particularly, the 7th electric capacity C7 can value be 1uF/50V, and the 8th resistance R8 can value 10K Ω.
Put it briefly, the conversion switch 400 of the utility model embodiment is by chip and control unit 420 and switching tube Q1 and peripheral cell, the coil of transformer and secondary rectifying tube i.e. the composition such as the 5th diode D5 and the 6th diode D6, wherein, chip is made up of a high-efficiency constant-flow LED drive circuit, support from the wide operating voltage input of 8V-600V, adopt fixing shutdown mode, turn-off time can be adjustable by outer meeting resistance such as the 4th resistance R4, the large I of its drive current is set by outer meeting resistance, drive current can from several milliamperes to 1 Amps, support linearity light adjusting and PWM light modulation, there is under-voltage protection, overheat protector, the function such as overcurrent and short-circuit protection, also there is not enough automatic regulating function of distinctive turn-off time.According to transformer magnetic induction principle, export transformer coil i.e. the second inductance L 2 after the break-make frequency by chip controls switching tube Q1 to, energy voltage, electric current are provided, and then driving LED light source works.
Particularly, the rectification circuit 100 that the high-frequency alternating current that electric ballast exports forms via eight fast recovery diodes carries out rectification, such as can select be that the diode of 75us carries out rectification, because the diode that the high-frequency cycle must use recovery time extremely short is in short-term with Loss reducing reverse recovery time.The output voltage of electron rectifier moment reaches 800V effect, in the fast recovery diode of rectification circuit 100, pressure selects 1KV, after carrying out rectification, output dc voltage is 20-100V, exist because this voltage high frequency interference source is such as expressed as dv/dt, be provided with LC filter circuit 200 to improve, voltage enters passive PFC source battle array through LC filtering to carry out correcting and improving harmonic distortion, because the voltage and current through inductance can not suddenly change, consider input terminal voltage, stablizing of electric current, after the start unit 410 of the first resistance R1 and the second resistance R2 composition carries out step-down, for chip U1 provides start voltage, electric current, chip internal linear power supply vdd voltage is 7.3V, the voltage-driven switch pipe Q1 of a VDD-0.2V is exported through GATE pin, second inductance L 2 coordinates the break-make of switching tube Q1 to transmit its energy to the 5th diode D5 in output circuit 450 and the 6th diode D6 to carry out secondary rectification, the stable voltage exported is provided after rectification, electric current is to LED, thus driving LED light source works.
In sum, according to the LED power drive unit of the utility model embodiment, by the rectification circuit comprising fast recovery diode, rectification is carried out to the high-frequency alternating current that ballast exports, high-frequency ac crest voltage ability to bear can be met, voltage dispersion is little, and then carry out by LC filter circuit the fluctuation that filtering can reduce circuit, reduce ballast power frequency to the impact of circuit.In addition, the device of the utility model embodiment can compatible electromagnetism ballast or circuit of electronic ballast, the high-frequency ac voltage driving LED light source that ballast exports can be connected, therefore in the transformation of some EMC heavy constructions, do not need to remove original electric ballast or electromagnetic ballast, more convenient, cost saving.In addition, device of the present utility model adopts low-power consumption voltage-dropping type, and input voltage from 8V-600V direct voltage, can be applicable to AC and the DC supply line of most countries.LED power driving device structure of the present utility model is simple, and peripheral cell is few, circuit stability.
Each functional unit in each embodiment of the utility model can be integrated in a process mould fast in, also can be that the independent physics of unit exists, also can two or more unit be integrated in a mould fast in.Above-mentioned integrated mould both can adopt the form of hardware to realize soon, and the form that software function mould also can be adopted fast realizes.If described integrated mould soon using the form that software function mould is fast realize and as independently production marketing or use time, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and described embodiment of the present utility model, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present utility model and spirit, scope of the present utility model is by claims and equivalency thereof.
Claims (11)
1. a LED power drive unit, is characterized in that, comprising:
Protective circuit, described protective circuit comprises first to fourth protective tube;
Rectification circuit, described rectification circuit is connected with ballast by protective circuit, and described rectification circuit comprises fast recovery diode;
LC filter circuit, described LC filter circuit is connected with described rectification circuit;
Circuit of power factor correction, described circuit of power factor correction is connected with described LC filter circuit;
Conversion switch, the input of described conversion switch is connected with described circuit of power factor correction, and the output of described conversion switch is connected with LED, and described conversion switch output drive signal works to described LED to drive described LED.
2. LED power drive unit as claimed in claim 1, it is characterized in that, described rectification circuit specifically comprises:
First rectifier bridge, described first rectifier bridge comprises:
First fast recovery diode, one end of described first fast recovery diode is connected with the first output of described ballast by the first protective tube;
Second fast recovery diode, one end of described second fast recovery diode is connected with the other end of described first fast recovery diode, between one end of described second fast recovery diode and the other end of described first fast recovery diode, there is first node, described first node ground connection, the other end of described second fast recovery diode is connected with the second output of described ballast by the second protective tube;
3rd fast recovery diode, one end of described 3rd fast recovery diode is connected with the first output of described ballast by described first protective tube;
4th fast recovery diode, one end of described 4th fast recovery diode is connected with the other end of described 3rd fast recovery diode, between one end of described 4th fast recovery diode and described 3rd fast recovery diode, there is Section Point, described Section Point is connected with described LC filter circuit, and the other end of described 4th fast recovery diode is connected with the second output of described ballast by described second protective tube;
Second rectifier bridge, described second rectifier bridge comprises:
5th fast recovery diode, one end of described 5th fast recovery diode is connected with the 3rd output of described ballast by the 3rd protective tube;
6th fast recovery diode, one end of described 6th fast recovery diode is connected with the other end of described 5th fast recovery diode, between one end of described 6th fast recovery diode and the other end of described 5th fast recovery diode, there is the 3rd node, described 3rd node ground connection, the other end of described 6th fast recovery diode is connected with the 4th output of described ballast by the 4th protective tube;
7th fast recovery diode, one end of described 7th fast recovery diode is connected with the 3rd output of described ballast by the 3rd protective tube;
8th fast recovery diode, one end of described 8th fast recovery diode is connected with the other end of described 7th fast recovery diode, between one end of described 8th fast recovery diode and the other end of described 7th fast recovery diode, there is the 4th node, described 4th node is connected with described LC filter circuit, and the other end of the 8th fast recovery diode is connected with the 4th output of described ballast by the 4th protective tube.
3. LED power drive unit as claimed in claim 2, it is characterized in that, described rectification circuit also comprises:
First electric capacity, one end of described first electric capacity is connected with the first output of described ballast by described first protective tube, and the other end of described first electric capacity is connected with the second output of described ballast by described second protective tube;
Second electric capacity, one end of described second electric capacity is connected with the 3rd output of described ballast by described 3rd protective tube, and the other end of described second electric capacity is connected with the 4th output of described ballast by described 4th protective tube.
4. LED power drive unit as claimed in claim 3, it is characterized in that, described LC filter circuit specifically comprises:
First inductance, one end of described first inductance is connected with the 4th node respectively with described Section Point;
3rd electric capacity, one end ground connection of described 3rd electric capacity, the other end of described 3rd electric capacity is connected with the other end of described first inductance, has the 5th node between the other end of described 3rd electric capacity and the other end of described first inductance, and described 5th node is connected with described circuit of power factor correction.
5. LED power drive unit as claimed in claim 4, it is characterized in that, described circuit of power factor correction comprises:
First diode, one end ground connection of described first diode;
Second diode, one end of described second diode is connected with the other end of described first diode, has the 6th node between one end of described second diode and the other end of described first diode;
3rd diode, one end of described 3rd diode is connected with the other end of described second diode, have the 7th node between one end of described 3rd diode and the other end of described second diode, the other end of described 3rd diode is connected with described 5th node and described conversion switch respectively;
4th electric capacity, one end of described 4th electric capacity is connected with described 5th node, and the other end of described 4th electric capacity is connected with described 6th node;
5th electric capacity, one end of described 5th electric capacity is connected with one end of described first diode, and the other end of described 5th electric capacity is connected with described 7th node.
6. LED power drive unit as claimed in claim 5, it is characterized in that, described conversion switch comprises:
Start unit, described start unit is connected with the other end of described 3rd diode;
Control unit, described control unit is connected with described start unit;
Switch element, control unit described in described switch element connects;
Current sense feedback unit, described current sense feedback unit is connected with described control unit and described switch element respectively;
Output unit, described output unit is connected with described switch element and described LED respectively, described output unit output drive signal, works to drive described LED.
7. LED power drive unit as claimed in claim 6, it is characterized in that, described start unit comprises:
First resistance, one end of described first resistance is connected with the other end of described 3rd diode;
Second resistance, one end of described second resistance is connected with the other end of described first resistance, and the other end of described second resistance is connected with described control unit.
8. LED power drive unit as claimed in claim 7, it is characterized in that, described switch element comprises:
3rd resistance and the 4th diode, described 3rd resistance and described 4th diodes in parallel, one end of described 3rd resistance is all connected with described control unit with one end of described 4th diode;
Switching tube, the first end of described switching tube is connected with the other end of described 3rd resistance and the other end of described 4th diode respectively, second end of described switching tube is connected with described current sense feedback unit, and the 3rd end of described switching tube is connected with described output unit;
4th resistance, one end of described 4th resistance is connected with described control unit, and the other end of described 4th resistance is connected with one end of described 3rd resistance and one end of described 4th diode respectively.
9. LED power drive unit as claimed in claim 8, it is characterized in that, described current sense feedback unit comprises:
5th resistance, one end of described 5th resistance is connected with the second end of described control unit and described switching tube respectively, the other end ground connection of described 5th resistance;
6th resistance, one end of described 6th resistance is connected with the second end of described control unit and described switching tube respectively, the other end ground connection of described 6th resistance;
7th resistance, one end of described 7th resistance is connected with the second end of described control unit and described switching tube respectively, the other end ground connection of described 7th resistance.
10. LED power drive unit as claimed in claim 8, it is characterized in that, described output unit comprises:
Second inductance, one end of described second inductance and the three-terminal link of described switching tube, the other end of described second inductance is connected with one end of described LED;
5th diode and the 6th diode, one end of described 5th diode is connected with the 3rd end of described switching tube and one end of described second inductance respectively, the other end of described 5th diode is connected with the other end of described LED, one end of described 6th diode is connected with the 3rd end of described switching tube and one end of described second inductance respectively, and the other end of described 6th diode is connected with the other end of described LED;
6th electric capacity, one end of described 6th electric capacity is connected with one end of described LED, and the other end of described 6th electric capacity is connected with the other end of described LED.
11. LED power drive units as claimed in claim 6, it is characterized in that, described conversion switch also comprises:
PWM dimming unit, described PWM dimming unit comprises:
8th resistance, one end of described 8th resistance is connected with described control unit;
7th electric capacity, one end of described 7th electric capacity is connected with the other end of described 8th resistance, have the 8th node between one end of described 7th electric capacity and the other end of described 8th resistance, described 8th node is connected with described control unit, the other end ground connection of described 7th electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420745593.XU CN204291485U (en) | 2014-11-27 | 2014-11-27 | LED power drive unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420745593.XU CN204291485U (en) | 2014-11-27 | 2014-11-27 | LED power drive unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204291485U true CN204291485U (en) | 2015-04-22 |
Family
ID=52874609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420745593.XU Active CN204291485U (en) | 2014-11-27 | 2014-11-27 | LED power drive unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204291485U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106413203A (en) * | 2016-11-26 | 2017-02-15 | 方彬辉 | Special-purpose rectification module for electronic rectifier |
| CN111988890A (en) * | 2020-10-26 | 2020-11-24 | 南京容测检测技术有限公司 | Light emitting diode lighting equipment power supply for electromagnetic compatibility test |
-
2014
- 2014-11-27 CN CN201420745593.XU patent/CN204291485U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106413203A (en) * | 2016-11-26 | 2017-02-15 | 方彬辉 | Special-purpose rectification module for electronic rectifier |
| CN111988890A (en) * | 2020-10-26 | 2020-11-24 | 南京容测检测技术有限公司 | Light emitting diode lighting equipment power supply for electromagnetic compatibility test |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202005042U (en) | Novel light-emitting diode (LED) drive circuit with high power factor | |
| CN102684525A (en) | Inverter circuit and control method for same | |
| CN103580470B (en) | For the mixed self-adapting power factor correction scheme of switching power converter | |
| CN102762011B (en) | LED (Light Emitting Diode) constant-current dimming drive circuit device | |
| CN101106846B (en) | A driving power and control method for magnetic control tube | |
| CN203775058U (en) | LED driving power supply based on single-end flyback transformer leakage inductor energy utilization | |
| CN101227780A (en) | LED lamp set drive power supply device | |
| CN102395233A (en) | Switching light modulation LED driving circuit and LED lamp set | |
| CN104168697A (en) | Output current control circuit used for switch section dimming of LED driving power supply | |
| CN204291485U (en) | LED power drive unit | |
| CN204291470U (en) | LED power drive unit | |
| CN104135794A (en) | Driving circuit of LED (Light Emitting Diode), and display device | |
| CN105792447B (en) | The LED drive circuit and its high power factor correction device of no electrolytic capacitor | |
| CN107885128A (en) | The high-power resistive load of continuously adjustabe based on alternating expression PWM | |
| CN114096042A (en) | Multi-path constant-current output LED driving power supply based on variable Boost inductor | |
| CN110061722A (en) | A kind of bearing power adjustment circuit by MOS type device frequency conversion drive | |
| CN103025021A (en) | Step-down light emitting diode (LED) drive circuit based on electrical inductance discharge time modulation | |
| CN102781147B (en) | LED (Light-emitting diode) power supply circuit with high power factor | |
| CN202425146U (en) | Drive circuit of LED (Light-Emitting Diode) lighting device | |
| CN202551447U (en) | LED (light-emitting diode) power supply | |
| CN101370333A (en) | Road lamp illumination power-saving device based on compensation type AC wave chopping technology | |
| CN207475932U (en) | A kind of isolated LED drive circuit | |
| CN201182026Y (en) | Driving power supply device of LED lamp group | |
| CN203788514U (en) | Discharge control module, silicon controlled rectifier light dimming LED drive circuit and system | |
| CN206650872U (en) | Intelligent dimming power circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191127 Address after: 518119 No.1 Yan'an Road, Kuiyong, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN BYD MICROELECTRONICS Co.,Ltd. Address before: 516083 Guangdong city of Huizhou province Dayawan xiangshuihe Patentee before: HUIZHOU BYD INDUSTRIAL Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after: BYD Semiconductor Co.,Ltd. Address before: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee before: BYD Semiconductor Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after: BYD Semiconductor Co.,Ltd. Address before: 518119 No.1 Yan'an Road, Kwai Chung street, Dapeng New District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN BYD MICROELECTRONICS Co.,Ltd. |