CN104168696B - Compatible type LED power circuit - Google Patents
Compatible type LED power circuit Download PDFInfo
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- CN104168696B CN104168696B CN201410374478.0A CN201410374478A CN104168696B CN 104168696 B CN104168696 B CN 104168696B CN 201410374478 A CN201410374478 A CN 201410374478A CN 104168696 B CN104168696 B CN 104168696B
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Abstract
The present invention relates to compatible type LED power circuit, connect end, power inductance L1, the first rectifier bridge, the second rectifier bridge, the first filter circuit, PWM controller, EMC circuit, coupling transformer T1 and LED output circuit including exchange；Exchange is connected end and is connected to the primary coil of coupling transformer T1 by power inductance L1, the second rectifier bridge and EMC circuit, and the secondary coil of coupling transformer T1 connects LED output circuit；The input of the first rectifier bridge is connected end with exchange and connects, and the outfan of the first rectifier bridge and the first filter circuit connect；First filter circuit is connected with the first input end of the first error amplifier of PWM controller；The signal output part of PWM controller is connected with the second end of the primary coil of coupling transformer T1.The impedance that can effectively regulate the different electric ballast of coupling of the present invention, protection electric ballast and meet actually used, it is achieved compatible；In addition can also compatible Inductive ballast and commonly exchange input, it is achieved real LED lamp tube replacement conventional fluorescent fluorescent tube.
Description
Technical field
The present invention relates to the power circuit of LED lamp tube, being specifically related to one can be with compatible electronic ballast, electricity
Sense ballast and the LED lamp tube power circuit of alternating current power supply.
Background technology
Traditional daylighting is to use fluorescent tube to realize with the mode of ballast combinations, typically has inductance town
Stream device adds trigger, or two kinds of forms of electric ballast.And popularizing along with novel illumination material LED,
Engendering the LED lamp tube of multiple replacement fluorescent tube, LED lamp tube is all with driving power circuit, to join
Close existing light fixture to use, directly substitute fluorescent tube.For using Inductive ballast or using alternating current direct
Connecing the LED lamp tube of driving, owing to directly using the 50-60Hz alternating current of civil power, its power circuit is easily real
Existing.But for the LED lamp tube driven with electric ballast, owing to electric ballast is output as high-frequency ac
Electricity, general frequency at 35-65kHz, its constant output current.If the load of electric ballast is not mated,
When the equiva lent impedance of load is higher than the impedance that electric ballast itself designs, then the alternating current buckling exported is big；
Otherwise, then the alternating voltage exported diminishes.Therefore, how to mate the output impedance of electric ballast, be LED
Drive the difficult point that power circuit is to be solved.Lack the compatible LED using different electric ballast on the market
Fluorescent tube, even if claiming to compatibility, the most compatible poor performance.I.e. there will be LED lamp tube can not point
Bright, or electric ballast crosses cause thermal damage.On the other hand, if LED lamp tube can be directly compatible with electric ballast,
Inductive ballast and the use exchanging driving, will further meet actually used needs.
Summary of the invention
Not enough for above-mentioned prior art, the technical problem to be solved in the present invention is to provide a kind of LED and drives electricity
Source circuit, makes the equivalent input impedance of LED drive power circuit follow the output impedance variation of electric ballast,
To reach the purpose of compatible different electric ballast.
For solving above-mentioned technical problem, the technical solution used in the present invention is, compatible type LED power circuit,
End, power inductance L1, the first rectifier bridge, the second rectifier bridge, the first filter circuit, PWM is connected including exchange
Controller, EMC circuit, coupling transformer T1 and LED output circuit；Exchange connects end and passes sequentially through merit
Rate inductance L1, the second rectifier bridge and EMC circuit are connected to the first end of the primary coil of coupling transformer T1,
The secondary coil of coupling transformer T1 connects LED output circuit；The input of the first rectifier bridge and the company of exchange
Connecing end to connect, the outfan of the first rectifier bridge and the first filter circuit connect；First filter circuit is controlled with PWM
The first input end of the first error amplifier of device processed connects, and the second input of the first error amplifier is used for
It is connected with the first reference voltage；The signal output part of PWM controller and the primary of coupling transformer T1
Second end of coil connects.Such scheme makes the pulsewidth of EMC can be become by the ECG of input
Change, thus change coupling impedance.
Further technical scheme is that described first filter circuit includes resistance R5, electric capacity C6, diode
D15 and electrochemical capacitor C7；The parallel branch of resistance R5 and electric capacity C6 is connected to the positive output of the first rectifier bridge
Between end and negative output terminal, the positive output end of the first rectifier bridge is VECG end, the negative output of the first rectifier bridge
End ground connection；The positive output end of the first rectifier bridge is also connected to the anode of diode D15, the moon of diode D15
Pole is connected with the positive pole of electrochemical capacitor C7, the minus earth of electrochemical capacitor C7；The positive pole of electrochemical capacitor C7
For VCC end, it is connected with the energization pins of PWM controller；The VECG end of the first filter circuit passes through one
Individual diode D17 is connected to the first input end of the first error amplifier of PWM controller, VECG end
It is connected with the anode of diode D17.
Further technical scheme is, described first filter circuit also includes Zener diode ZD4；Described
Zener diode ZD4 is connected between VECG end and diode D15, the negative electrode of Zener diode ZD4
Being connected with VECG end, the anode of Zener diode ZD4 is connected with the anode of diode D15.Such side
Case can be applicable to the compatibility of preheating start-up type and OnNow type, for preheating start-up type, arrives to voltage and opens
During galvanic electricity pressure, just PWM controller is powered.
Further technical scheme is, signal isolation circuit；Described signal isolation circuit include switching tube Q6,
Resistance R9, resistance R10 and diode D16；The source ground of switching tube Q6, resistance R9 is connected to out
Close between source electrode and the grid of pipe Q6；The grid of switching tube Q6 is also connected to VECG end；Switching tube Q6
Drain electrode be connected to canonical reference voltage end by resistance R10；The drain electrode of switching tube Q6 is also connected to diode
The anode of D16, the negative electrode of diode D16 is connected to the first input end of the first error amplifier.Such
Scheme can be avoided when accessing non-ECG, it is to avoid VECG end signal affects the pulsewidth modulation of PWM controller.
Further technical scheme is, also includes frequency-selecting bleeder circuit and charging circuit；Described frequency-selecting
Bleeder circuit includes capacitive portion；Described power inductance L1 is series at exchange and connects anode and second rectifier bridge of end
Between；Described exchange connects end and is connected to the first rectifier bridge, capacitive portion and the company of exchange by frequency-selecting bleeder circuit
The anode connecing end connects；Described coupling transformer T1 also includes second subprime coil, this second subprime coil with
Charging circuit connects, and charging circuit is provided with power supply outfan, and this power supply outfan controls with PWM
The energization pins of device connects；The current detection voltage end of LED output circuit is connected to the of PWM controller
Second input of two error amplifiers, the first input end of this second error amplifier is used for and the second benchmark
Reference voltage connects.Such scheme make PWM controller can according to input trigger difference with different
Mode carries out pulsewidth modulation, the use of the most compatible CCG, AC and ECG.
Further technical scheme is, described charging circuit includes diode D7, switching tube Q2, crystal
Pipe Q3, Zener diode ZD3, Zener diode ZD6, diode D9, diode D10, electrolysis electricity
Hold C4, electrochemical capacitor C5, resistance R3 and resistance R6；The anode of diode D7 and coupling transformer T1
First end of primary coil connects, and the negative electrode of diode D7 is connected with the negative electrode of Zener diode ZD3, surely
The anode of pressure diode ZD3 is connected to the drain electrode of switching tube Q2, the grid of switching tube Q2 by resistance R3
Being connected with the colelctor electrode of transistor Q3, the source electrode of switching tube Q2 is connected to the positive pole of electrochemical capacitor C5, brilliant
The grounded emitter of body pipe Q3；The base stage of transistor Q3 is connected to Zener diode ZD6 by resistance R6
Anode；The negative electrode of Zener diode ZD6 is connected to the negative electrode of diode D9；The anode of diode D9 with
First end of the second subprime coil of coupling transformer T1 connects, the second end ground connection of second subprime coil；Two
The negative electrode of pole pipe D9 also anode with diode D10 is connected, and the negative electrode of diode D10 is also connected to electrolysis
The positive pole of electric capacity C5, the minus earth of electrochemical capacitor C5, the positive pole of electrochemical capacitor C4 and diode D10
Anode connect, the minus earth of electrochemical capacitor C4.
Preferably, described frequency-selecting bleeder circuit also includes and the perceptual portion of capacitive portion composition bleeder circuit；Described
Capacitive portion is electric capacity CS1, and described perception portion is transformer LS1；One end of electric capacity CS1 is connected end with exchange
Anode connect, the other end of electric capacity CS1 is connected with one end of the primary coil of transformer LS1, transformer
The other end of the primary coil of LS1 is connected to exchange and connects the negative terminal of end；The secondary coil two of transformer LS1
End is connected respectively to the input of the first rectifier bridge；The capacitance of electric capacity CS1 is not more than 0.3 μ F；Transformer
The inductance value of the primary coil of LS1 is 0.3mH-6mH.
Preferably technical scheme is also that described capacitive portion is electric capacity CS2；Described frequency-selecting bleeder circuit also includes
Electric capacity CS3；One end of electric capacity CS2 is connected the anode of end with exchange, and the other end of electric capacity CS2 is connected to the
One input of one rectifier bridge；One end of electric capacity CS3 is connected to another input of the first rectifier bridge,
The electric capacity CS3 other end is connected to exchange and connects the negative terminal of end.
Further technical scheme is, also includes that secondary signal isolates circuit, described secondary signal isolation circuit
Including diode D18 and Zener diode ZD7；First filter circuit is connected to by a diode D17
The first input end of the first error amplifier of PWM controller, wherein the negative electrode and first of diode D17 is by mistake
The first input end of difference amplifier connects；The negative electrode of Zener diode ZD7 is connected to the anode of diode D17,
The anode of Zener diode ZD7 is connected with the anode of diode D18, and the negative electrode of diode D18 is connected to
The first input end of two error amplifiers.Such scheme both makes to be not provided with the maximum pulse width of PWM controller
Dmax, PWM output pulse width D is not affected by the second error amplifier.
Further technical scheme is also to include protection circuit；Described protection circuit includes resistance R1, resistance
R7, resistance R8, transistor Q5, Zener diode ZD1, switching tube Q1 and electric capacity C2；Resistance R7
With the series arm of resistance R8 is connected between positive output end and the reference edge of EMC circuit；Transistor Q5
Base stage be connected to resistance R7 and the node of resistance R8；The emitter stage of transistor Q5 is connected to EMC circuit
Reference edge；The colelctor electrode of transistor Q5 is connected to the grid of switching tube Q1；The source electrode of switching tube Q1 is even
Receive the reference edge of EMC circuit, the grounded drain of switching tube Q1；The anode of Zener diode ZD1 connects
To the emitter stage of transistor Q5, the negative electrode of Zener diode ZD1 is connected to the colelctor electrode of transistor Q5；Brilliant
The colelctor electrode of body pipe Q5 is also by the positive output end being connected to EMC circuit by resistance R1；Electric capacity C2's
One end is connected to the positive output end of EMC circuit, the other end ground connection of electric capacity C2.
The compatible type LED power circuit of the present invention can effectively regulate the impedance of the different electric ballast of coupling,
Protection electric ballast and meet actually used, it is achieved compatible；In addition can also compatible Inductive ballast and general
Logical exchange input, it is achieved real LED lamp tube replaces conventional fluorescent fluorescent tube.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the first embodiment of compatible type LED power circuit of the present invention.
Fig. 2 is the circuit theory diagrams of the second embodiment of compatible type LED power circuit of the present invention.
Fig. 3 is the input voltage schematic diagram of electric ballast.
Fig. 4 is the input voltage schematic diagram of Inductive ballast or alternating current.
Fig. 5 is the Inductive ballast input voltage schematic diagram of preheating start-up type.
Detailed description of the invention
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings
As it is shown in figure 1, the first embodiment of the compatible type LED power circuit of the present invention, including exchange even
Connect end (anode LA1, anode LA2, negative terminal RA1 and negative terminal RA2), power inductance L1, the first rectification
Bridge (diode D11, diode D12, diode D13 and diode D14), the second rectifier bridge (two poles
Pipe D1, diode D2, diode D3 and diode D4), the first filter circuit, PWM controller,
EMC circuit, coupling transformer T1 and LED output circuit.Exchange connect end pass sequentially through power inductance L1,
Second rectifier bridge and EMC circuit are connected to the first end of the primary coil of coupling transformer T1, specifically,
The anode LA1 of exchange connection end is connected to first end of power inductance L1, anode LA2 by fuse F3
It is connected to anode LA1 by fuse F1；Power inductance L1 is connected to EMC circuit by the second rectifier bridge
Input anode, the input of EMC circuit is connected with the negative output terminal of the second rectifier bridge, and the second rectifier bridge is just
Between outfan (diode D1, the node of diode D2) and negative output terminal, also bridging has an electric capacity C1；
The positive output end of EMC circuit is connected to primary coil first end of coupling transformer T1.Coupling transformer T1
Secondary coil connect LED output circuit, specifically, in the present embodiment, LED output circuit includes two poles
Pipe D8, electrochemical capacitor C3 and resistance R4, the anode of diode D8 is connected to the secondary of coupling transformer T1
First end of coil, the second end ground connection of coupling transformer secondary coil；The positive pole of electrochemical capacitor C3 and two poles
The negative electrode of pipe D8 connects, the minus earth of electrochemical capacitor C3；The most extremely VO end of electrochemical capacitor C3,
For being connected with the anode of LED string；The negative electrode of electrochemical capacitor C3 is connected with first end of resistance R4, electricity
The current detection voltage end that second end is LED output circuit (i.e. IO end) of resistance R4, is simultaneously used for and LED
The negative electrode of lamp string connects；Wherein primary coil second end of coupling transformer T1 and secondary coil the first end are same
Name end.The current detection voltage end of LED output circuit is connected to the second error amplifier of PWM controller
Second input (being positive input terminal in the present embodiment) of EA2, the first of this second error amplifier EA2 is defeated
Enter end (negative input end) for being connected with the second reference voltage REF2.By coupling transformer T1's
Power supply, is charged to burning voltage, thus realizes the power supply to LED string electrochemical capacitor C3；Need
Bright, LED output circuit is not the consideration category of the present invention, the most only proposes one and realizes LED and power
The mode of output, not in order to limit the present invention, actual implement in can be to use other forms, other functions
LED output circuit.
The input of the first rectifier bridge (i.e. diode D11 and the node of diode D13, diode D12 with
The node of diode D14) it is connected end connection with exchanging.Specifically, the present invention also includes frequency-selecting dividing potential drop electricity
Road, described frequency-selecting bleeder circuit includes capacitive portion, and in the present embodiment, described capacitive portion is electric capacity CS1, institute
Stating perception portion is transformer LS1；One end of electric capacity CS1 is connected the anode of end (specially with fusing with exchange
Anode LA1, anode LA2 after device F3 connection) connect, the other end of electric capacity CS1 and transformer LS1
Primary coil P one end connect, the other end of the primary coil P of transformer LS1 be connected to exchange connect
The negative terminal (negative terminal RA1 and the negative terminal RA2 being connected to fuse F2) of end；The secondary coil of transformer LS1
S two ends are connected respectively to the input of the first rectifier bridge.The capacitance of electric capacity CS1 is not more than 0.3 μ F；Mutually
The inductance value of the primary coil of sensor LS1 is 0.3mH-6mH.When input is for ECG (electric ballast),
Ac frequency is typically up to 35KHz-65KHz, as it is shown on figure 3, under the alternating current of high frequency, capacitive portion i.e. electricity
The impedance holding CS1 is the least, and the perception portion i.e. primary coil P-impedance of transformer LS1 is relatively big, thus mutual inductance
The secondary coil S of device LS1 can obtain the bigger dividing potential drop of input voltage；On the other hand, (electric for CCG when input
Sense ballast) or during common current, its ac frequency is the about 50Hz of civil power, as shown in Figure 4, belongs to
The alternating current of low frequency, the impedance of electric capacity CS1 is relatively big, and the impedance of the primary coil P of transformer LS1 is relative
Less, thus the voltage obtained on the secondary coil S of transformer LS1 will be substantially less that ECG input is to obtain
Voltage, with this scheme, can judge the kind of input voltage, it is judged that input be ECG or
CCG/AC；On the other hand, when input is for ECG, input voltage can pass through frequency-selecting bleeder circuit dividing potential drop,
Thus frequency-selecting bleeder circuit also has the function of the input voltage detecting ECG.Without carrying out high frequency judgement
Situation (being only used for ECG) and the situation relatively low to the accuracy of detection of input ECG voltage, can cancel choosing
The setting of frequency division volt circuit.
The outfan of the first rectifier bridge and the first filter circuit connect；Specifically, described first filter circuit bag
Include resistance R5, electric capacity C6, diode D15 and electrochemical capacitor C7；The parallel connection of resistance R5 and electric capacity C6 is propped up
Road is connected to positive output end (node of diode D11 and diode D12) and the negative output of the first rectifier bridge
Between end (diode D13 and the node of diode D14), the positive output end of the first rectifier bridge is VECG
End (voltage after the conversion of the ECG input voltage obtaining detection), the negative output terminal ground connection of the first rectifier bridge；
The positive output end of the first rectifier bridge is also connected to the anode of diode D15, the negative electrode of diode D15 and electrolysis
The positive pole of electric capacity C7 connects, the minus earth of electrochemical capacitor C7；The most extremely VCC end of electrochemical capacitor C7,
It is connected with the energization pins of PWM controller；The VECG end of the first filter circuit passes through a diode D17
(the present embodiment is negative input to be connected to the first input end of the first error amplifier EA1 of PWM controller
End), VECG end is connected with the anode of diode D17.Second input of the first error amplifier EA2
(positive input terminal) is for being connected with the first reference voltage REF1；The signal output part of PWM controller
(i.e. PWM end in figure) is connected with the second end of the primary coil of coupling transformer T1, specifically, and this letter
Number outfan is connected to the grid of a switching tube Q4, and the source ground of this switching tube Q4, drain electrode is connected to
Primary coil second end of coupling transformer T1.After the first filter circuit obtains ECG input voltage, by
PWM controller is powered by the saturated electrochemical capacitor C7 that charges, and makes PWM controller work.For
The electric ballast of preheating start-up type, as it is shown in figure 5, input voltage can be at the beginning time one relatively low
Being worth, the typically time through about about 500ms just can increase to stable running voltage.For this situation,
Can connect between VECG end with diode D15 a Zener diode ZD4, wherein voltage stabilizing two pole more
The negative electrode of pipe ZD4 is connected with VECG end, the anode of Zener diode ZD4 and the anode of diode D15
Connect.Reverse-conducting is not had due to Zener diode ZD4 (i.e. during low-voltage), electrolysis during preheating
Electric capacity C7 is not charged, and PWM controller is not intended for electrically activating, after voltage stabilization is running voltage,
Zener diode ZD4 reverse-conducting, PWM controls to obtain power supply；(i.e. the most pre-for OnNow type
Heat the time) electric ballast, even if input voltage Zener diode ZD4 reverse-conducting, not shadow during unlatching
Ring the startup of PWM controller, because the electric ballast of OnNow type and preheating start-up type can be realized
Compatibility between electric ballast.
Operation principle: the saturation current of power inductance L1 is more than the peak point current flowing through power inductance L1.Merit
Rate inductance general value 0.1-1mH of L1 inductance value.
When inputting CCG or AC, because of frequency as little as 50/60Hz, the equiva lent impedance of power inductance L1 is very
Little, nearly equivalent to short circuit, circuit is not affected.
When inputting ECG, because frequency is up to 35-65kHz, the equiva lent impedance on power inductance L1 is tens of
Between hundreds of ohms.Now, take
IECG≈ICS1+IL1
(in above formula, IECG is the output current effective value of the design of ECG, and ICS1 is to flow through electric capacity CS1
Current effective value, IL1 is the current effective value flowing through power inductance L1) can allow the input of LED lamp tube
Equiva lent impedance and the output impedance matching of the design of ECG, make LED lamp tube and the ECG compatibility of design.Root
According to ECG output characteristics, if IECG > ICS1+IL1, ECG output voltage VO ECG rises；If
IECG < ICS1+IL1, ECG output voltage VO ECG declines.PWM controller is had shown in figure
Internal equivalent structure figure, the FB signal end of PWM controller, drive mould by the electric current of PWM controller
The pwm signal of block output 20-100kHz, drives the break-make of switching tube Q4, when FB signal voltage rises
Time, PWM pulsewidth D declines；Otherwise, PWM pulsewidth D rises.
When after the rectified filtering of detection signal by electric capacity CS1 and transformer LS1, become electric ballast
Detection signal VECG (i.e. voltage on WECG end, VECG and VOECG of output voltage VO ECG
Being directly proportional, concrete proportionate relationship is relevant to the parameter of circuit devcie), VECG input after diode D17 to
First error amplifier, compares with the first reference voltage REF1, through a diode after amplification
Output FB signal.
During this:
FB ↓=> D ↑=> IL1 ↑=> ICS1+IL1 ↑=> VOECG ↓=> VECG
↓=> FB ↑=> D ↓=> IL1 ↓=> ICS1+IL1 ↓=> VOECG ↑=> VECG
↑=> FB ↓
Being consequently formed a closed feedback loop, the input equiva lent impedance of LED lamp tube can be to different ECG
Match different equiva lent impedances, reach the purpose of compatible ECG.Set PWM as maximum pulse width Dmax
Time, LED string current detection voltage IO is still less than reference voltage REF2, i.e. " EA2-> EA2+ ", and that
Second error amplifier EA2 without output, I/O signal on FB signal without impact, and then to PWM export
Pulsewidth D does not affect.
When input is for CCG or AC, the second error amplifier EA2 normally works,
During this:
FB ↓=> D ↑=> IO ↑=> FB ↑=> D ↓=> IO ↓=> FB ↓
It is consequently formed a closed feedback loop, makes the operating current of LED string to be effectively controlled.
Further, present invention additionally comprises signal isolation circuit；Described signal isolation circuit include switching tube Q6,
Resistance R9, resistance R10 and diode D16；The source ground of switching tube Q6, resistance R9 is connected to out
Close between source electrode and the grid of pipe Q6；The grid of switching tube Q6 is also connected to VECG end；Switching tube Q6
Drain electrode be connected to canonical reference voltage end REF by resistance R10；The drain electrode of switching tube Q6 is also connected to
The anode of diode D16, the negative electrode of diode D16 is connected to first input of the first error amplifier EA1
End.
Set the first reference voltage REF1 with diode D16 forward conduction voltage sum much smaller than standard
Reference voltage REF.When input is for CCG or AC, VECG is close to 0, and switching tube Q6 ends,
REF is through resistance R10, the negative input end of diode D16 to first error amplifier EA1, its voltage
Value is higher than the first reference voltage REF1, i.e. " EA1-> EA1+ ", then the first error amplifier
EA1 is without output, and PWM output pulse width D is not affected by VECG signal.
Present invention additionally comprises charging circuit, coupling transformer T1 also includes second subprime coil, and this is second years old
Secondary coil is connected with charging circuit, and charging circuit is provided with power supply outfan, this power supply outfan
It is connected with the energization pins of PWM controller.Specifically, described charging circuit includes diode D7, switch
Pipe Q2, transistor Q3, Zener diode ZD3, Zener diode ZD6, diode D9, diode
D10, electrochemical capacitor C4, electrochemical capacitor C5, resistance R3 and resistance R6；The anode of diode D7 and coupling
The first end closing transformator T1 primary coil connects, the negative electrode of diode D7 and the moon of Zener diode ZD3
Pole connects, and the anode of Zener diode ZD3 is connected to the drain electrode of switching tube Q2, switching tube by resistance R3
The grid of Q2 is connected with the colelctor electrode of transistor Q3, and the source electrode of switching tube Q2 is connected to electrochemical capacitor C5's
Positive pole, the grounded emitter of transistor Q3；The base stage of transistor Q3 is connected to voltage stabilizing two by resistance R6
The anode of pole pipe ZD6；The negative electrode of Zener diode ZD6 is connected to the negative electrode of diode D9；Diode D9
Anode be connected with the first end of the second subprime coil of coupling transformer T1, the second end of second subprime coil
Ground connection；The negative electrode of diode D9 also anode with diode D10 is connected, and the negative electrode of diode D10 also connects
Receive the positive pole of electrochemical capacitor C5, the minus earth of electrochemical capacitor C5, the positive pole of electrochemical capacitor C4 and two
The anode of pole pipe D10 connects, the minus earth of electrochemical capacitor C4.When input is for CCG or AC, if
Input voltage is relatively low, and the most now the output voltage of EMC circuit is relatively low, and Zener diode ZD3 will not be anti-
To conducting, thus without the energization pins having startup voltage to be supplied to PWM controller, PWM controller is not
Work；
When inputting normal voltage, Zener diode ZD3 reverse-conducting, switching tube Q2 turns on, EMC electricity
The output voltage on road through diode D7, Zener diode ZD3, resistance R3, switching tube Q2 to electrochemical capacitor
C5 charges, when the magnitude of voltage of electrochemical capacitor C5 reaches the startup voltage of PWM controller, and PWM controller
Start work.Then PWM has pulsewidth to export, therewith the coil-induced electricity of the second subprime of coupling transformer T1
Pressing through diode D9 rectification, electrochemical capacitor C4 filters, then through diode D10 to PWM controller
Energization pins.Zener diode ZD6 reverse-conducting after startup, transistor Q3 turns on therewith, by switching tube
Q2 grid voltage is pulled to close to 0V, makes switching tube Q2 end.By diode when i.e. PWM controller starts
D7, Zener diode ZD3, resistance R3, switching tube Q2, resistance R2, Zener diode ZD5 form
Start-up circuit power, after startup then by the second subprime coil of coupling transformer T1 through diode D9, electricity
Solve electric capacity C4, the current rectifying and wave filtering circuit of diode D10, electrochemical capacitor C5 composition is powered；When fluorescent tube inputs
When being ECG, the supply voltage of PWM controller by the secondary coil S of transformer LS1 through the first rectifier bridge
Obtain after rectification, control ingenious.
Present invention additionally comprises protection circuit；Described protection circuit include resistance R1, resistance R7, resistance R8,
Transistor Q5, Zener diode ZD1, switching tube Q1 and electric capacity C2；Resistance R7 and the string of resistance R8
Connection branch road is connected between positive output end and the reference edge of EMC circuit；The base stage of transistor Q5 is connected to electricity
Resistance R7 and the node of resistance R8；The emitter stage of transistor Q5 is connected to the reference edge of EMC circuit；Crystal
The colelctor electrode of pipe Q5 is connected to the grid of switching tube Q1；The source electrode of switching tube Q1 is connected to EMC circuit
Reference edge, the grounded drain of switching tube Q1；The anode of Zener diode ZD1 is connected to sending out of transistor Q5
Emitter-base bandgap grading, the negative electrode of Zener diode ZD1 is connected to the colelctor electrode of transistor Q5；The colelctor electrode of transistor Q5
Also by the positive output end being connected to EMC circuit by resistance R1；One end of electric capacity C2 is connected to EMC
The positive output end of circuit, the other end ground connection of electric capacity C2.When circuit occurs abnormal, ECG exports to fluorescent tube
Voltage through the second rectifier bridge (diode D1-diode D4) rectification, then filtered by electric capacity C1, then
Through EMC circuit, through resistance R7, resistance R8 dividing potential drop, the once branch pressure voltage knot more than transistor Q5
Conducting voltage, then transistor Q5 conducting, switching tube Q1 grid voltage is dragged down by transistor Q5, switching tube
Q1 ends, thus reaches to protect switching tube Q1 late-class circuit and the purpose of ECG.
Fig. 2 show the second embodiment of the present invention, and the difference with the first embodiment above-mentioned is, institute
Stating capacitive portion is electric capacity CS2；Described frequency-selecting bleeder circuit also includes electric capacity CS3；One end of electric capacity CS2 with
Exchange connects the anode of end, and the other end of electric capacity CS2 is connected to an input of the first rectifier bridge；Electric capacity
One end of CS3 is connected to another input of the first rectifier bridge, and the electric capacity CS3 other end is connected to exchange even
Connect the negative terminal of end.In the present embodiment, the capacitance of the electric capacity CS2 capacitance much larger than electric capacity CS3, although
Electric capacity CS3 is the device of electric capacity, substantially capacitive, but because of its capacitance much smaller than with its with the use of electricity
Holding CS2, on the circuit of high frequency dividing potential drop, realize the purpose of dividing potential drop detection equally, its operation principle is with above-mentioned
The first embodiment is identical.Additionally, the capacitance of electric capacity CS2 and electric capacity CS3 can be suitable, it is also possible to
Do not set electric capacity CS3, and be separately provided electric capacity CS2 (or do not set transformer LS1 electric capacity CS1 is only set), this
Sample electric capacity CS2 also forms dividing potential drop with resistance R5, can obtain dividing potential drop equally；But the shunting action to frequency-selecting dividing potential drop
The arranging effect of the electric capacity CS1 in first embodiment above and transformer LS1 is not good.Transformer LS1 with
Electric capacity CS1 series connection, as a load of ECG output, makes a portion output electric current of ECG flow through
This load, effectively reduces the electric current flowing through frequency-selecting bleeder circuit, i.e. reduces the loss of rectifier tube D1-D4,
And then reduce the loss of whole circuit, improve power-efficient.
On the other hand, the present embodiment also includes that secondary signal isolates circuit, described secondary signal isolation circuit bag
Include diode D18 and Zener diode ZD7；First filter circuit is connected to by a diode D17
The first input end (negative input end) of the first error amplifier EA1 of PWM controller, wherein diode
The negative electrode of D17 and the first input end of the first error amplifier EA1 connect；The negative electrode of Zener diode ZD7
Being connected to the anode of diode D17, the anode of Zener diode ZD7 is connected with the anode of diode D18,
The negative electrode of diode D18 is connected to the first input end (negative input end) of the second error amplifier EA2.If
The current detection voltage IO determining LED string deducts the reverse voltage stabilizing of Zener diode ZD7 still less than VECG,
Deduct diode D18 forward voltage again, then have " EA2-> EA2+ ", then the second error amplifier EA2
Without output, PWM output pulse width D is not affected by I/O signal.Now, both make to be not provided with PWM
Big pulsewidth Dmax, PWM output pulse width D is not affected by the second error amplifier EA2.This secondary signal
Isolation circuit also apply be applicable to the first embodiment above-mentioned.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Within bright spirit and principle, any modification, equivalent substitution and improvement etc. made, should be included in this
Within bright protection domain.
Claims (9)
1. compatible type LED power circuit, it is characterised in that: include that exchange connects end, power inductance L1, the first rectifier bridge, the second rectifier bridge, the first filter circuit, PWM controller, EMC circuit, coupling transformer T1 and LED output circuit；Exchange connects end and passes sequentially through the first end that power inductance L1, the second rectifier bridge and EMC circuit are connected to the primary coil of coupling transformer T1, and the secondary coil of coupling transformer T1 connects LED output circuit；The input of the first rectifier bridge is connected end with exchange and connects, and the outfan of the first rectifier bridge and the first filter circuit connect；First filter circuit is connected with the first input end of the first error amplifier of PWM controller, and the second input of the first error amplifier is for being connected with the first reference voltage；The signal output part of PWM controller is connected with the second end of the primary coil of coupling transformer T1；Described first filter circuit includes resistance R5, electric capacity C6, diode D15 and electrochemical capacitor C7, the parallel branch of resistance R5 and electric capacity C6 is connected between positive output end and the negative output terminal of the first rectifier bridge, the positive output end of the first rectifier bridge is VECG end, the negative output terminal ground connection of the first rectifier bridge；The positive output end of the first rectifier bridge is also connected to the anode of diode D15, and the negative electrode of diode D15 is connected with the positive pole of electrochemical capacitor C7, the minus earth of electrochemical capacitor C7；The most extremely VCC end of electrochemical capacitor C7, is connected with the energization pins of PWM controller；The VECG end of the first filter circuit is connected to the first input end of the first error amplifier of PWM controller by a diode D17, and VECG end is connected with the anode of diode D17.
Compatible type LED power circuit the most according to claim 1, it is characterised in that: described first filter circuit also includes Zener diode ZD4；Described Zener diode ZD4 is connected between VECG end and diode D15, and the negative electrode of Zener diode ZD4 is connected with VECG end, and the anode of Zener diode ZD4 is connected with the anode of diode D15.
Compatible type LED power circuit the most according to claim 2, it is characterised in that: signal isolation circuit；Described signal isolation circuit includes switching tube Q6, resistance R9, resistance R10 and diode D16；The source ground of switching tube Q6, resistance R9 is connected between source electrode and the grid of switching tube Q6；The grid of switching tube Q6 is also connected to VECG end；The drain electrode of switching tube Q6 is connected to canonical reference voltage end by resistance R10；The drain electrode of switching tube Q6 is also connected to the anode of diode D16, and the negative electrode of diode D16 is connected to the first input end of the first error amplifier.
Compatible type LED power circuit the most according to claim 1, it is characterised in that: also include frequency-selecting bleeder circuit and charging circuit；Described frequency-selecting bleeder circuit includes capacitive portion；Described power inductance L1 is series between anode and the second rectifier bridge that exchange connects end；Described exchange connects end and is connected to the first rectifier bridge by frequency-selecting bleeder circuit, and capacitive portion is connected the anode of end and connects with exchange；Described coupling transformer T1 also includes second subprime coil, and this second subprime coil is connected with charging circuit, and charging circuit is provided with power supply outfan, and this power supply outfan is connected with the energization pins of PWM controller；The current detection voltage end of LED output circuit is connected to the second input of the second error amplifier of PWM controller, and the first input end of this second error amplifier is for being connected with the second reference voltage.
Compatible type LED power circuit the most according to claim 4, it is characterised in that: described charging circuit includes diode D7, switching tube Q2, transistor Q3, Zener diode ZD3, Zener diode ZD6, diode D9, diode D10, electrochemical capacitor C4, electrochemical capacitor C5, resistance R3 and resistance R6；The anode of diode D7 is connected with the first end of coupling transformer T1 primary coil, the negative electrode of diode D7 is connected with the negative electrode of Zener diode ZD3, the anode of Zener diode ZD3 is connected to the drain electrode of switching tube Q2 by resistance R3, the grid of switching tube Q2 is connected with the colelctor electrode of transistor Q3, the source electrode of switching tube Q2 is connected to the positive pole of electrochemical capacitor C5, the grounded emitter of transistor Q3；The base stage of transistor Q3 is connected to the anode of Zener diode ZD6 by resistance R6；The negative electrode of Zener diode ZD6 is connected to the negative electrode of diode D9；The anode of diode D9 is connected with the first end of the second subprime coil of coupling transformer T1, the second end ground connection of second subprime coil；The negative electrode of diode D9 also anode with diode D10 is connected, and the negative electrode of diode D10 is also connected to the positive pole of electrochemical capacitor C5, the minus earth of electrochemical capacitor C5, and the positive pole of electrochemical capacitor C4 is connected with the anode of diode D10, the minus earth of electrochemical capacitor C4.
Compatible type LED power circuit the most according to claim 4, it is characterised in that: described frequency-selecting bleeder circuit also includes and the perceptual portion of capacitive portion composition bleeder circuit；Described capacitive portion is electric capacity CS1, and described perception portion is transformer LS1；One end of electric capacity CS1 is connected the anode of end and connects with exchange, and the other end of electric capacity CS1 is connected with one end of the primary coil of transformer LS1, and the other end of the primary coil of transformer LS1 is connected to exchange and connects the negative terminal of end；The secondary coil two ends of transformer LS1 are connected respectively to the input of the first rectifier bridge；The capacitance of electric capacity CS1 is not more than 0.3 μ F；The inductance value of the primary coil of transformer LS1 is 0.3mH-6mH.
Compatible type LED power circuit the most according to claim 4, it is characterised in that: described capacitive portion is electric capacity CS2；Described frequency-selecting bleeder circuit also includes electric capacity CS3；One end of electric capacity CS2 is connected the anode of end with exchange, and the other end of electric capacity CS2 is connected to an input of the first rectifier bridge；One end of electric capacity CS3 is connected to another input of the first rectifier bridge, and the electric capacity CS3 other end is connected to exchange and connects the negative terminal of end.
Compatible type LED power circuit the most according to claim 4, it is characterised in that: also including that secondary signal isolates circuit, described secondary signal isolation circuit includes diode D18 and Zener diode ZD7；First filter circuit is connected to the first input end of the first error amplifier of PWM controller by a diode D17, and wherein the negative electrode of diode D17 and the first input end of the first error amplifier connect；The negative electrode of Zener diode ZD7 is connected to the anode of diode D17, and the anode of Zener diode ZD7 is connected with the anode of diode D18, and the negative electrode of diode D18 is connected to the first input end of the second error amplifier.
Compatible type LED power circuit the most according to claim 1, it is characterised in that: also include protection circuit；Described protection circuit includes resistance R1, resistance R7, resistance R8, transistor Q5, Zener diode ZD1, switching tube Q1 and electric capacity C2；The series arm of resistance R7 and resistance R8 is connected between positive output end and the reference edge of EMC circuit；The base stage of transistor Q5 is connected to resistance R7 and the node of resistance R8；The emitter stage of transistor Q5 is connected to the reference edge of EMC circuit；The colelctor electrode of transistor Q5 is connected to the grid of switching tube Q1；The source electrode of switching tube Q1 is connected to the reference edge of EMC circuit, the grounded drain of switching tube Q1；The anode of Zener diode ZD1 is connected to the emitter stage of transistor Q5, and the negative electrode of Zener diode ZD1 is connected to the colelctor electrode of transistor Q5；The colelctor electrode of transistor Q5 is also by the positive output end being connected to EMC circuit by resistance R1；One end of electric capacity C2 is connected to the positive output end of EMC circuit, the other end ground connection of electric capacity C2.
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| CN201410374478.0A CN104168696B (en) | 2014-07-31 | 2014-07-31 | Compatible type LED power circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104640322B (en) * | 2015-02-06 | 2017-11-28 | 深圳市豪恩光电照明股份有限公司 | The LED lamp tube driver of compatible electronic ballast |
| CN104994655A (en) * | 2015-07-14 | 2015-10-21 | 盐城工学院 | LED constant current driving circuit |
| CN107635302B (en) * | 2016-07-19 | 2019-03-12 | 常州明石晶电科技有限公司 | A kind of LED light source driving circuit and LED light source device |
| CN106385733B (en) * | 2016-10-13 | 2018-02-27 | 厦门阳光恩耐照明有限公司 | The LED daylight lamp drive circuit of compatible electronic formula, inductance type and alternating current |
| CN106793265B (en) * | 2016-12-02 | 2019-01-25 | 晨辉光宝科技有限公司 | LED drive circuit and LED lamp tube |
| CN108430129B (en) * | 2017-02-14 | 2020-10-09 | 朗德万斯公司 | LED lamp for placing in a fluorescent lamp fixture |
| CN110062491B (en) * | 2018-01-18 | 2022-04-29 | 朗德万斯公司 | Electronic driver and lighting module |
| CN110650563B (en) | 2018-06-27 | 2022-04-05 | 朗德万斯公司 | Driver, method for controlling driver, and lighting module |
| CN110662323B (en) | 2018-06-28 | 2022-04-12 | 朗德万斯公司 | Driver, method for controlling driver, and lighting module |
| CN108650752A (en) * | 2018-07-25 | 2018-10-12 | 东莞市灿光电子科技有限公司 | A kind of compatible ballast and the electrically driven (operated) LED lamp tube of exchange |
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Effective date of registration: 20180703 Address after: 523000 B, 3rd floor, 16 Wanfeng Road, YLE village, Liaobu Town, Dongguan, Guangdong. Patentee after: Dongguan stable core electronic technology Co., Ltd. Address before: 516000 1022 houses, 305 91 East Lake five street, Huicheng District, Huizhou, Guangdong. Patentee before: Luo Jiguo |
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