CN203645890U - LED power supply circuit capable of being compatible with traditional fluorescent lamp ballast - Google Patents

LED power supply circuit capable of being compatible with traditional fluorescent lamp ballast Download PDF

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CN203645890U
CN203645890U CN201320867338.8U CN201320867338U CN203645890U CN 203645890 U CN203645890 U CN 203645890U CN 201320867338 U CN201320867338 U CN 201320867338U CN 203645890 U CN203645890 U CN 203645890U
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diode
capacitor
input terminal
inductance
ballast
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王兴利
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Abstract

The utility model discloses an LED power supply circuit capable of being compatible with a traditional fluorescent lamp ballast, which comprises input terminals Ta1, Ta2, Tb1, Tb2, capacitors C1, C2, C3, diodes D1, D2, D3, D4, D5, D6 and an LED array, wherein the capacitor C1 is parallelly connected between the terminal Ta1 and the terminal Ta2; the cathode of the diode D1 is connected with the anode of the diode D2 and is then connected with the input terminal Ta1; the anode of the diode D1 is respectively connected with the anode of the diode D3 and the anode of the diode D6; the cathode of the diode D2 is respectively connected with the cathode of the diode D4 and the cathode of the diode D5; the anode of the diode D5 is connected with the cathode of the diode D6 and is then connected with one end of the capacitor C3; and the other end of the capacitor C3 is respectively connected with the input terminal Tb1 and the input terminal Tb2. According to the LED power supply circuit capable of being compatible with the traditional fluorescent lamp ballast, compatible abutting between the LED array and the ballast used by the traditional CFL fluorescent lamp can be realized, and the complicated rewiring and wire changing processes can be avoided.

Description

A kind of can with the LED power circuit of conventional fluorescent lamp ballast compatibility
Technical field
The utility model relates to LED fluorescent lamp, specifically refer to a kind of can with the LED power circuit of conventional fluorescent lamp ballast compatibility.
Background technology
The LED fluorescent tube that sell market has environmental protection, the advantage of energy saving, but user need to change and could use (schematic diagram 1, Fig. 2) original conventional fluorescent lamp interior circuit.Particularly use in the situation of electronic ballast, if access energising again after electric ballast not being removed gently can not normally light, heavy can burn out electric ballast and LED fluorescent tube.User replaces and uses inconvenience, and need to have the electrotechnics personnel of qualification to operate.
Though also have few part manufacturer to have to claim can be compatible product, practical effect is not good mostly.Be mainly manifested in following several respects:
1, same product can not be simultaneously compatible for the ballast of electric ballast and inductance type;
2, conversion efficiency is not high, and overall conversion efficiency, lower than 80%, is worked reliable and stable not;
3, line construction complexity, cost is higher;
4, mostly be both end power supplying pattern, after first insert fluorescent tube one end, other end PIN pin is charged;
5, in the time that charged for replacement is installed, the danger that brings electric shock to operating personnel.
Utility model content
The problem that the utility model need solve be to provide a kind of realize ballast (comprising Inductive ballast and electric ballast) that LED array and traditional C FL fluorescent lamp use dock compatibility, remove from loaded down with trivial details rewiring relocate process can with the LED power circuit of conventional fluorescent lamp ballast compatibility.
The utility model can be achieved through the following technical solutions:
The utility model discloses a kind of can with the LED power circuit of conventional fluorescent lamp ballast compatibility, comprise input terminal Ta1, Ta2, Tb1, Tb2, capacitor C 1, C2, C3, diode D1, D2, D3, D4, D5, D6 and LED array, described capacitor C 1 is connected in parallel on terminal Ta1, between Ta2, after the anodic bonding of the negative electrode of diode D1 and diode D2, be connected with input terminal Ta1, diode D1 anode respectively with the anode of diode D3, one end of capacitor C 2, the negative input end of LED array, the anodic bonding of diode D6, the negative electrode of diode D2 respectively with the negative electrode of diode D4, the other end of capacitor C 2, the positive input terminal of LED array, the negative electrode of diode D5 connects, after the anodic bonding of the negative electrode of diode D3 and diode D4, be connected with input terminal Ta2, after being connected with the negative electrode of diode D6, the anode of diode D5 is connected with one end of capacitor C 3, the other end of capacitor C 3 respectively with input terminal Tb1, Tb2 connects.
After the anode of described diode D5 is connected with the negative electrode of diode D6, be connected with one end of inductance L 1, the other end of inductance L 1 is connected with one end of capacitor C 3, and the other end of capacitor C 3 is connected with input terminal Tb1, Tb2 respectively.
Described capacitor C 1 is serially connected with switch S 1-1, after being connected with the negative electrode of diode D6, the anode of diode D5 is connected with the armature winding head end of transformer T1, transformer T1 secondary winding is connected with diode D7, resistance R 1, capacitor C 5, the armature winding end of transformer T1 is connected with one end of capacitor C 3, switch S 2 first and one end of capacitor C 4, the other end of capacitor C 3 is connected with the interposition of switch S 2, one end and the input terminal Tb1 of switch S 1-2, and the other end of capacitor C 4 and switch S 2 the 3rd, the other end and the input terminal Tb2 of switch S 1-2 are connected.
The anode of described diode D5 is connected with one end of capacitor C 3, one end of capacitor C 4 respectively after being connected with the negative electrode of diode D6, the other end of capacitor C 3 is connected with one end and the input terminal Tb1 of thermistor RTC, and the other end of capacitor C 4 is connected with the other end and the input terminal Tb2 of thermistor RTC.
After being connected with the negative electrode of diode D6, the anode of described diode D5 is connected with one end of inductance L 1, the other end of inductance L 1 is connected with one end of capacitor C 3, one end of capacitor C 4 respectively, the other end of capacitor C 3 is connected with one end and the input terminal Tb1 of inductance L 2, and the other end of capacitor C 4 is connected with the other end and the input terminal Tb2 of inductance L 2.
After being connected with the negative electrode of diode D6, the anode of described diode D5 is connected with one end of capacitor C 3, the other end of capacitor C 3 is connected with the tail end of LE winding and the head end of L1 winding of transformer T1 respectively, and two outputs of transformer T1 are connected with input terminal Tb1, Tb2 respectively.
After being connected with the negative electrode of diode D6, the anode of described diode D5 is connected with one end of capacitor C 3, the other end of capacitor C 3 is connected with one end of inductance L 1, the other end of inductance L 1 is connected with the mid point of inductance L 2, the two ends of inductance L 2 are connected with input terminal Tb1, Tb2 respectively, inductance L 1 can share a magnetic core with L2, also an independent magnetic core separately.
The utility model can have following beneficial effect with the LED power circuit of conventional fluorescent lamp ballast compatibility:
1, simultaneously compatible for the ballast of most electric ballasts and common inductance type, and utilize substantially the flow stabilizing function of original ballast, realize the safety and stability power supply to LED.
2, circuit is comparatively simple and reliable, and conversion efficiency is higher, can be greater than 85%.
3,, after first insert any one end of fluorescent tube, other end PIN pin is lower than 36V safe voltage.In the time that charged for replacement is installed, can not bring the danger of electric shock to operating personnel.Therefore also can be by European CE safety certification.
Brief description of the drawings
Accompanying drawing 1 for the utility model can with the circuit diagram of the LED power circuit of conventional fluorescent lamp ballast compatibility;
Accompanying drawing 2 is the circuit model reduced graph that traditional auto-excitation type half-bridge resonant formula starts formula ballast and traditional C FL fluorescent lamp fast;
The circuit model reduced graph that accompanying drawing 3 is the compatible typical conventional fluorescent high-frequency ac electric ballast of application the utility model;
Accompanying drawing 4 is the circuit model reduced graph of the utility model and typical traditional inductance type ballast compatibility (band starter);
Accompanying drawing 5 is the utility model and the circuit model reduced graph of isolating instantaneous starting formula electric ballast compatibility;
Accompanying drawing 6 for the utility model can with the LED power circuit of conventional fluorescent lamp ballast compatibility a kind of improve after circuit diagram;
Accompanying drawing 7 for the utility model can with the circuit diagram of leaving out capacitor C 1 of the LED power circuit of conventional fluorescent lamp ballast compatibility;
Accompanying drawing 8 is the utility model and the circuit model reduced graph of boost quick startup formula ballast and other various types ballast compatibility;
Accompanying drawing 9 is the circuit diagram of the utility model after can improving with the another kind of the LED power circuit of conventional fluorescent lamp ballast compatibility;
Accompanying drawing 10 for the utility model can with the LED power circuit of conventional fluorescent lamp ballast compatibility the third improve after circuit diagram;
Accompanying drawing 11 for the utility model can with the 4th of the LED power circuit of conventional fluorescent lamp ballast compatibility kind of improvement after circuit diagram;
Accompanying drawing 12 for the utility model can with the 5th of the LED power circuit of conventional fluorescent lamp ballast compatibility kind of improvement after circuit diagram;
Accompanying drawing 13 for the utility model can with the circuit diagram using with the collocation of inductance type ballast and starter of the LED power circuit of conventional fluorescent lamp ballast compatibility;
Accompanying drawing 14 for the utility model can with the circuit diagram using with the collocation of isolated instantaneous starting electric ballast of the LED power circuit of conventional fluorescent lamp ballast compatibility;
Accompanying drawing 15 for the utility model can with the 6th of the LED power circuit of conventional fluorescent lamp ballast compatibility kind of improvement after circuit diagram;
Accompanying drawing 16 for Figure 15 improve after with the arrange in pairs or groups circuit diagram of use of inductance type ballast and starter;
The circuit diagram of accompanying drawing 17 rear and isolated instantaneous starting electric ballast collocation for Figure 15 improves;
The circuit diagram that accompanying drawing 18 is rear for Figure 15 improves and typical auto-excitation type quick-starting direct electric ballast is arranged in pairs or groups.
Embodiment
Below in conjunction with Figure of description, the utility model is further described:
As shown in Figure 1, the utility model discloses a kind of can with the LED of conventional fluorescent lamp ballast compatibility
Power circuit, comprise input terminal Ta1, Ta2, Tb1, Tb2, capacitor C 1, C2, C3, diode D1, D2, D3, D4, D5, D6 and LED array, described capacitor C 1 is connected in parallel on terminal Ta1, between Ta2, after the anodic bonding of the negative electrode of diode D1 and diode D2, be connected with input terminal Ta1, diode D1 anode respectively with the anode of diode D3, one end of capacitor C 2, the negative input end of LED array, the anodic bonding of diode D6, the negative electrode of diode D2 respectively with the negative electrode of diode D4, the other end of capacitor C 2, the positive input terminal of LED array, the negative electrode of diode D5 connects, after the anodic bonding of the negative electrode of diode D3 and diode D4, be connected with input terminal Ta2, after being connected with the negative electrode of diode D6, the anode of diode D5 is connected with one end of capacitor C 3, the other end of capacitor C 3 respectively with input terminal Tb1, Tb2 connects.
Embodiment mono-: with typical conventional fluorescent high-frequency ac electric ballast compatibility.
As shown in Figure 2, classical a traditional auto-excitation type half-bridge resonant formula starts the circuit model reduced graph of formula ballast and traditional C FL fluorescent lamp fast, CFL fluorescent tube equivalent resistance after order has started is R(≈ 500), it is in parallel with C5 in electric ballast, then connects with L2 in electric ballast.R and C5 parallel impedance are: ZRC5=
Figure 201183DEST_PATH_IMAGE002
= , inductive impedance ZL=j ω L.CFL fluorescent lamp and electric ballast total impedance are Z1=ZRC+ ZL=
Figure 429220DEST_PATH_IMAGE002
+ j ω L.(for ease of analyzing, in circuit internal resistance and inductance, Equivalent DC impedance is ignored at this) CFL fluorescent lamp and electric ballast LRC loop gross power P1=
Figure 355587DEST_PATH_IMAGE006
=
Figure 169959DEST_PATH_IMAGE008
=
Figure 992422DEST_PATH_IMAGE010
.
Be illustrated in figure 3 and will use the LED fluorescent tube of this power supply to access circuit model figure after this electric ballast.High-frequency current is through L2, again through D1, D2, D3, after D4 rectification (in the design, key element C1 is in parallel with rectification input), again through C2 smothing filtering, in parallelly with C5 again provide electric current to load LED array, C2 and LED array are DC load, are equivalent to resistance R led, for the ease of analysis and understanding, Rled is treated as to the equiva lent impedance R of above-mentioned CFL steady-working state.The design's object is by this power source design, by the resonance current path setting of original electric ballast, total impedance is adjusted simultaneously, makes its gross power (or power output) meet the needs of LED lamp.As for the impedance Rled of C2 and LED array, be can adjust by the difference string of prior change LED array the combination of quantity completely.
C1 and LED array Equivalent DC impedance R complex impedance in parallel: ZRC1= =
R connects in parallel with C5 again with C3, complex impedance is ZRC5=
Figure 409125DEST_PATH_IMAGE016
=
Figure 402489DEST_PATH_IMAGE018
,
Inductive impedance ZL=j ω L.
Adopt this power source design LED fluorescent tube and electric ballast total impedance Z2=j ω L+
Figure 422397DEST_PATH_IMAGE012
+
Figure 159409DEST_PATH_IMAGE016
Because of C1 and C5 genus series relationship, because C1 value is much smaller than C5, it is in parallel with R that total impedance depends primarily on C1 again, is to simplify to calculate, therefore C5 and the impedance of R parallel branch are omitted.Draw Z2 ≈ j ω L+
Figure 682795DEST_PATH_IMAGE012
in sum, total impedance Z1 ≈ when this electric ballast connects with traditional C FL fluorescent tube + j ω L,---(R is the impedance of fluorescent lamp equivalence stable state).
Total impedance Z2 ≈ when this electric ballast connects with use LED fluorescent tube of the present utility model
Figure 151002DEST_PATH_IMAGE020
,-----(R is LED array equiva lent impedance).
Above two formulas of contrast, are just very easy to find, and total impedance is mainly determined by the less C1 of capacity.By changing the amount of capacity of C1, can adjust Z2 total impedance, thereby change ballast total load current (I is total=
Figure 426126DEST_PATH_IMAGE022
), and then change the flow through electric current of LED array and power (because of LED electric current+C1 electric current=total current, again
Figure 600755DEST_PATH_IMAGE024
≈ / Rled).
Mention above, CFL fluorescent lamp and electric ballast LRC loop gross power P1= = =
Figure 507214DEST_PATH_IMAGE010
.Visible Z1 and the power relation that is inversely proportional to.Suppose that a fluorescent lamp and ballast are 36W, need to design a 18W LED fluorescent tube, with primary electron ballast compatibility.Z2 is necessary for Z1 twice, (is Z2=2*Z1=2*
Figure 278861DEST_PATH_IMAGE028
+ j ω L).And conventional electronic ballast can be with thering is negative resistance charactertistic traditional C FL lamp works, violent fluorescent tube equiva lent impedance changes the electric current that can both control well fluorescent tube, in like manner use its driving LED array-supported, also can control well and flow through LED array electric current.Scope how to control CFL lamp current because partly belong to electric ballast for this reason, therefore not to repeat here.
Embodiment bis-: with the traditional inductance type ballast compatibility of typical case (band starter).
As shown in Figure 4, while using LED fluorescent tube of the present utility model and typical traditional inductance type ballast collaborative work, circuit diagram as above, does not need to take apart light fixture change circuit, but need to, by former starter S, be replaced with the short connector being fixedly connected with, with communication line.Short connector can be made the profile identical with former starter and size, and directly quick-replaceable also can unite two into one this short connector and fusing function, plays the effect of overcurrent protection.
Another outstanding advantage is, uses LED fluorescent tube of the present utility model after first insert any one end of fluorescent tube, because C3 capacitance is less, to 50/60HZ power frequency impedance (
Figure 229499DEST_PATH_IMAGE030
) very large, playing the effect of obstruct, other end PIN pin is lower than 36V safe voltage.In the time that charged for replacement is installed, can not bring the danger of electric shock to operating personnel.Therefore also can be by the safety certification of various countries.
Electric main Vac is through original inductance type ballast L, through D1, and D2, D3, after the rectification of D4 bridge rectifier and C2 filtering, flow through LED array, then replace original starter through joining specially attached short connector, the LED array electric current of flowing through flow to other end Tb1 through short connector, and Tb2 forms loop.The electric current of LED array is connected with original inductance type ballast L, and is limited by it, LED electric current I led= .
As LED array being designed to 60 string N also, total about 180V of VF value.With 40W tradition inductance type ballast L ≈ 920mH, LED electric current I led=
Figure 510494DEST_PATH_IMAGE032
=
Figure 453042DEST_PATH_IMAGE034
=0.138A, power output is Po=Iled * Vf=0.138A*180V=24.8W.
This application, a metering function of filling part the original inductance type ballast of performance, though can not accurate constant current, there is very high practicality and economy, power factor (PF) is up to more than 0.9, and has energy loss few, and conversion efficiency is more than 97%.
Embodiment tri-: with isolation instantaneous starting formula electric ballast compatibility.
As shown in Figure 5, use LED fluorescent tube of the present utility model and the collaborative work of isolated instantaneous starting formula electric ballast.High frequency voltage is coupled to C1 through isolating transformer T2, applies on Ta terminal and Tb terminal.Electric current from Ta terminal input through D1, D2, D3, D4 rectification changes the LED array of flowing through after C2 smothing filtering again after direct current into, through D5, is reduced to exchange arrives Tb terminal through C3 and form loop after D6 rectification.C3, under this pattern, plays 3 critical effects: the one, play a high-frequency current passage, the 2nd, the size of choosing C3 capacity change line impedance impedance (
Figure 890977DEST_PATH_IMAGE030
thereby) make fluorescent tube export satisfactory electric current, the 3rd,, after first insert any one end of fluorescent tube, because C3 capacitance is less, to 50/60HZ power frequency impedance (
Figure 577173DEST_PATH_IMAGE030
) very large, play the effect of obstruct, in the process of charged for replacement, can avoid operating personnel accidentally to touch other end generation Danger Electric shock risk.
Also can add again an inductance L 1 to connect with C3 at above-mentioned second, as shown in Figure 3, jointly change the impedance of fluorescent tube, but its principle and effect all should be at the utility model containing within general scopes.The impedance that inductance L 1 provides is Zl=
Figure 49743DEST_PATH_IMAGE036
.In this application, the obstructed overcurrent of C1, also just can not change the capacitive reactance of fluorescent tube.It acts on by C3(or L1) take over.As shown in Figure 7, can omit completely in the case C1 need not, even if do not produce any impact on road yet.
Embodiment tetra-: with quick startup formula ballast and other various types ballast compatibility of boosting.
As shown in Figure 8, described capacitor C 1 is serially connected with switch S 1-1, after being connected with the negative electrode of diode D6, the anode of diode D5 is connected with the armature winding head end of transformer T1, transformer T1 secondary winding and diode D7, resistance R 1, capacitor C 5 connects, the armature winding end of transformer T1 and one end of capacitor C 3, first of switch S 2 is connected with one end of capacitor C 4, the interposition of the other end of capacitor C 3 and switch S 2, one end of switch S 1-2 is connected with input terminal Tb1, the other end of capacitor C 4 and switch S 2 the 3rd, the other end of switch S 1-2 is connected with input terminal Tb2.
Add S1-1, S1-2, (in concrete enforcement, this switch can manual switchover (dial type or connect button formula do not limit), also can automatically carry out by extra noncontacting switch for tri-switches of S2.), user can be switched use.Its usage is described respectively below.
Figure 163192DEST_PATH_IMAGE038
use under situation in A example, ballast belongs to self-excitation and starts fast formula, tube filament is also one of oscillating current path, S1-1, and S1-2 must switch on closure state and can normally work, but S1-2 is in the time of off-state, C3, C4 is connected in path, has been equivalent to reduce the capacitance of C1, thereby change total impedance, will make power decline (application examples A has explanation).
Figure 885161DEST_PATH_IMAGE040
at the similar quick startup formula ballast that has independent filament power supply winding of this example (D example), by n1, n2 filament power supply winding is that in CFL, filament heating more easily starts to improve cathode temperature specially.But for the situation that adopts LED array, there is no the needs of heating, in order to save electric energy, should be by S1-1, two switches of S1-2 are placed in off-state, and to avoid n1, n2 filament power supply winding is by short circuit.In addition, in the upper figure shown type of this example ballast application scenarios, because being low frequency input, C3C4 impedance cannot form too greatly effective current path, so the ballast shown in this example (D example) must be by S2 closure, to form current channel, in upper figure, should be switched to below (, by C4 short circuit).After S2 closure, be transformed into both end power supplying pattern, after first insert any one end of fluorescent tube, because C3 or C4 cannot be played the effect of obstruct by short circuit, in the process of charged for replacement, if operating personnel touch other end PIN pin, likely there is Danger Electric shock risk, should avoid charged for replacement fluorescent tube or the charged other end PIN pin (the same with necessary power-off replacing incandescent lamp reason) that touches.
Figure 109468DEST_PATH_IMAGE042
in above-mentioned B application examples, because C1 capacity is less, with respect to 50/60HZ low-frequency impedance very
Greatly, S1-1 on off state does not affect.But S1-2 must be in closure state.With making current path.If will be switched to closure state (being short circuit C3 or C4), there is without starter, can normally work, also without the short connector that uses any alternative use.
Figure 170965DEST_PATH_IMAGE044
in above-mentioned C application examples, isolation instantaneous starting formula electric ballast belongs to both-end input, therefore S1-1 is without effect (all can open and close), S1-2 must switch on closure state and can normally work, but S1-2 is in the time of off-state, C3, C4 is connected in path, thereby change total impedance, will make power decline (application examples A has explanation).S2 must be in off-state (centre position), otherwise C3C4 cannot bring into play power-limiting effect.
Add constant current control part functional module, T1 transformer, D7, R1, C5, the components and parts such as Q1, its operation principle is below described:
Figure 455316DEST_PATH_IMAGE038
constant current control functional module, for accurately controlling the electric current of LED array.Q1 is in parallel with constant flow module, and in the time of Q1 conducting, constant flow module is bypassed, and is equivalent to cut little ice.Q1 whether conducting depends on that T1 is elementary and has or not the above high-frequency current by 20KHZ;
In the time working in any electric ballast pattern, there is the above high-frequency current of 20KHZ elementary by T1, at T1 secondary induction voltage, by D7 rectification, R1 current limliting, C5 is filtered into stable DC signal high level and goes to control Q1 conducting, forces constant-current control module to lose efficacy, and LED array electric current is only determined by electric ballast and LED fluorescent tube total impedance;
In the time not accessing any electric ballast, elementary by T1 without the above high-frequency current of 20KHZ, Q1 controls grid cannot produce cut-in voltage, and Q1 is in closed condition.The electric current of LED array of flowing through forces and enters constant current function module, accurately controls the electric current (constant flow module described herein comprises various forms of circuit, as switching regulator, linear constant current mode etc.) of LED array by constant flow module.
The result of doing is like this, so long as not being connected on high-frequency electronic ballast work, the electric current of LED array, by constant flow module control, is worked as long as being connected under high-frequency electronic ballast condition, constant flow module is inoperative, and the electric current of LED array depends on electric ballast and fluorescent tube total impedance thereof.
The benefit of doing is like this, do not take over what ballast even outside, and the direct input of civil power also can ensure that LED array works in normal operating current and is unlikely and burns out.On the other hand, also avoid the introducing of inner constant flow module to force the load moment of external electrical ballast to enter high-impedance state and produce unacceptable high voltage.So ensure electric ballast steady operation.
As shown in Figure 6, after being connected with the negative electrode of diode D6, the anode of what it was different from Fig. 1 scheme is described diode D5 is connected with one end of inductance L 1, the other end of inductance L 1 is connected with one end of capacitor C 3, and the other end of capacitor C 3 is connected with input terminal Tb1, Tb2 respectively.
As shown in Figure 9, after being connected with the negative electrode of diode D6, the anode of what it was different from Fig. 1 scheme is described diode D5 is connected with one end of capacitor C 3, one end of capacitor C 4 respectively, the other end of capacitor C 3 is connected with one end and the input terminal Tb1 of thermistor RTC, and the other end of capacitor C 4 is connected with the other end and the input terminal Tb2 of thermistor RTC.Above-mentioned improvement is on the utility model basis, input terminal Tb1 and Tb2 use semistor short circuit, with the heat filament impedance of simulation quick-starting direct, avoid by some indivedual particular electrical sub-ballast be mistaken for do not insert fluorescent tube or impedance too small and stop normal work.
As shown in figure 10, after being connected with the negative electrode of diode D6, the anode of what it was different from Fig. 1 scheme is described diode D5 is connected with one end of inductance L 1, the other end of inductance L 1 is connected with one end of capacitor C 3, one end of capacitor C 4 respectively, the other end of capacitor C 3 is connected with one end and the input terminal Tb1 of thermistor RTC, and the other end of capacitor C 4 is connected with the other end and the input terminal Tb2 of thermistor RTC.Above-mentioned improvement is on the utility model basis, input terminal Tb1 and Tb2 use semistor short circuit, with the heat filament impedance of simulation quick-starting direct, avoid by some indivedual particular electrical sub-ballast be mistaken for do not insert fluorescent tube or impedance too small and stop normal work.
As shown in figure 11, after being connected with the negative electrode of diode D6, the anode of what it was different from Fig. 1 scheme is described diode D5 is connected with one end of inductance L 1, the other end of inductance L 1 is connected with one end of capacitor C 3, one end of capacitor C 4 respectively, the other end of capacitor C 3 is connected with one end and the input terminal Tb1 of inductance L 2, and the other end of capacitor C 4 is connected with the other end and the input terminal Tb2 of inductance L 2.On the utility model basis, Tb1 uses inductance to be connected with Tb2, with the heat filament impedance of simulation quick-starting direct, avoid by some indivedual particular electrical sub-ballast be mistaken for do not insert fluorescent tube or impedance too small and stop normal work, or filament causes energy loss for electrical short.Starting fast formula electric ballast for high frequency is suitable for.
As shown in figure 12, after being connected with the negative electrode of diode D6, the anode of what it was different from Fig. 1 scheme is described diode D5 is connected with one end of capacitor C 3, the other end of capacitor C 3 is connected with the tail end of LE winding and the head end of L1 winding of transformer T1 respectively, and two outputs of transformer T1 are connected with input terminal Tb1, Tb2 respectively.Upper figure, on basis of the present utility model, increases T1, and T1 is by two from beginning to end being connected in series of winding, and the inductance value of two windings is respectively L1, L2.The effect of T1 is because of different application bar part difference, below describes respectively.
As shown in figure 13, in the time using (as application examples B) with the collocation of inductance type ballast and starter, T1 is equivalent to an inductance L=L1+L2, for the alternating current impedance of 50/60HZ less (T1 impedance Z= ), electric current, directly by T1, substitutes short connector S with outside starter and forms closed current channel.As figure below (S is the LED short-circuiting device of a closure, also can be a fuse).In the time that the resistor by a less resistance (or wire) replaces C3, LED array can be directly lighted in inductance type ballast and starter collocation, and no matter whether starter S is by short circuit.
As shown in figure 14, during with the collocation of isolated instantaneous starting electric ballast, L1 or L2 and C3, and LED array series connection, increase total impedance, so that gross power is lower than the total impedance of access traditional C FL fluorescent tube, L1 or L2 and C3 and LED array Rled total impedance are Z=
Figure 177733DEST_PATH_IMAGE030
the visible L1 of+j ω L+ Rled. or L2 are larger, and impedance will increase.
As shown in figure 15, on the utility model and above improved basis, do the improvement of two aspects,
Figure 359315DEST_PATH_IMAGE046
to become a winding T1-1 of T1 with the inductive transduction of C3 series connection, and and T1-2, T1-3 shares a magnetic core composition winding.
Figure 814567DEST_PATH_IMAGE048
increase LED constant flow module and commutation circuit thereof; it act as; under non-electronic ballast condition (without any ballast or various inductance type low frequency ballast); LED array electric current is controlled the current control circuit of different types (LED constant flow module comprises linear constant flow module, switch buck constant current mode etc.) via LED constant flow module; And under high-frequency electronic ballast collocation condition of work, high-frequency current flow through T1-1 or the T1-2 winding of T1 transformer, induce high frequency ac signal at T1-3 winding, through D8 rectification, R1 current limliting, after C2 smothing filtering, produce the control grid that a DC control signal puts on Q1, force Q1 conducting, the electric current of LED array through Q1 enter ground and without LED constant flow module, the electric current of LED array is by the C1 in electric ballast and the utility model, C3, T1-2, design modifying is carried out in the impedance of the components and parts such as T1-1.Avoid the introducing of inner constant flow module cause the load moment of external electrical ballast to enter high-impedance state and produce unacceptable high voltage, ensured electric ballast steady operation.
Its operation principle:
As shown in figure 16, in the time using (as application examples B) with the collocation of inductance type ballast and starter, as figure below, T1-2 is equivalent to an inductance L 2, for the alternating current impedance of 50/60HZ less (L2 impedance Z=
Figure 714390DEST_PATH_IMAGE036
), electric current, directly by T1, substitutes short connector S with outside starter and forms closed current channel.As figure below (S is the LED short-circuiting device of a closure, also can be a fuse).In the time that the resistor by a less resistance (or wire) replaces C3, LED array can be directly lighted in inductance type ballast and starter collocation, and no matter whether starter S is by short circuit.Because pass through without high-frequency current in T1, in T1-3, cannot induce enough high voltages, cannot make Q1 conducting, so control through LED constant flow module through the electric current of LED array, make the electric current of LED array ensure stable.This kind of application mode still can ensure that the electric current of LED array is permanent steady when can preventing from not taking over what ballast.
As shown in figure 17, during with isolated instantaneous starting electric ballast collocation, half windings in series (the total inductance L=L1+ of T1-1 and T1-2 ) and C3, and LED array series connection, increases total impedance, so that gross power is lower than the total impedance of access traditional C FL fluorescent tube, L and C3 and LED array Rled total impedance are Z=
Figure 582169DEST_PATH_IMAGE030
the visible L1 of+j ω L+ Rled. or L2 are larger, and impedance will increase, and gross power will diminish.And the function of LED constant flow module by Q1 short circuit and inoperative, as for the control of Q1, page up has description.
As shown in figure 18, during with typical auto-excitation type quick-starting direct electric ballast collocation, the contacts such as LED array impedance is in parallel with C5, connect with the inductance value L2 of the winding of C1 and T1-2, jointly determine the total current of total impedance and LED array, L2 is larger, j ω L impedance will increase, and gross power will diminish.
The above, be only preferred embodiment of the present utility model, not the utility model done to any pro forma restriction; The those of ordinary skill of all industry all can be implemented the utility model with the above shown in by specification accompanying drawing swimmingly; But all those skilled in the art are not departing within the scope of technical solutions of the utility model, can utilize disclosed above technology contents and a little change, the modification of making and the equivalent variations developing, be equivalent embodiment of the present utility model; Meanwhile, the change of any equivalent variations that all foundations essence technology of the present utility model is done above embodiment, modification and differentiation etc., within all still belonging to the protection range of the technical solution of the utility model.

Claims (7)

  1. One kind can with the LED power circuit of conventional fluorescent lamp ballast compatibility, it is characterized in that: comprise input terminal Ta1, Ta2, Tb1, Tb2, capacitor C 1, C2, C3, diode D1, D2, D3, D4, D5, D6 and LED array, described capacitor C 1 is connected in parallel on terminal Ta1, between Ta2, after the anodic bonding of the negative electrode of diode D1 and diode D2, be connected with input terminal Ta1, diode D1 anode respectively with the anode of diode D3, one end of capacitor C 2, the negative input end of LED array, the anodic bonding of diode D6, the negative electrode of diode D2 respectively with the negative electrode of diode D4, the other end of capacitor C 2, the positive input terminal of LED array, the negative electrode of diode D5 connects, after the anodic bonding of the negative electrode of diode D3 and diode D4, be connected with input terminal Ta2, after being connected with the negative electrode of diode D6, the anode of diode D5 is connected with one end of capacitor C 3, the other end of capacitor C 3 respectively with input terminal Tb1, Tb2 connects.
  2. According to claim 1 can with the LED power circuit of conventional fluorescent lamp ballast compatibility, it is characterized in that: after the anode of described diode D5 is connected with the negative electrode of diode D6, be connected with one end of inductance L 1, the other end of inductance L 1 is connected with one end of capacitor C 3, and the other end of capacitor C 3 is connected with input terminal Tb1, Tb2 respectively.
  3. According to claim 1 can with the LED power circuit of conventional fluorescent lamp ballast compatibility, it is characterized in that: described capacitor C 1 is serially connected with switch S 1-1, after being connected with the negative electrode of diode D6, the anode of diode D5 is connected with the armature winding head end of transformer T1, transformer T1 secondary winding and diode D7, resistance R 1, capacitor C 5 connects, the armature winding end of transformer T1 and one end of capacitor C 3, first of switch S 2 is connected with one end of capacitor C 4, the interposition of the other end of capacitor C 3 and switch S 2, one end of switch S 1-2 is connected with input terminal Tb1, the other end of capacitor C 4 and switch S 2 the 3rd, the other end of switch S 1-2 is connected with input terminal Tb2.
  4. According to claim 1 can with the LED power circuit of conventional fluorescent lamp ballast compatibility, it is characterized in that: the anode of described diode D5 is connected with one end of capacitor C 3, one end of capacitor C 4 respectively after being connected with the negative electrode of diode D6, the other end of capacitor C 3 is connected with one end and the input terminal Tb1 of thermistor RTC, and the other end of capacitor C 4 is connected with the other end and the input terminal Tb2 of thermistor RTC.
  5. According to claim 1 can with the LED power circuit of conventional fluorescent lamp ballast compatibility, it is characterized in that: after the anode of described diode D5 is connected with the negative electrode of diode D6, be connected with one end of inductance L 1, the other end of inductance L 1 is connected with one end of capacitor C 3, one end of capacitor C 4 respectively, the other end of capacitor C 3 is connected with one end and the input terminal Tb1 of inductance L 2, and the other end of capacitor C 4 is connected with the other end and the input terminal Tb2 of inductance L 2.
  6. According to claim 1 can with the LED power circuit of conventional fluorescent lamp ballast compatibility, it is characterized in that: after the anode of described diode D5 is connected with the negative electrode of diode D6, be connected with one end of capacitor C 3, the other end of capacitor C 3 is connected with the tail end of LE winding and the head end of L1 winding of transformer T1 respectively, and two outputs of transformer T1 are connected with input terminal Tb1, Tb2 respectively.
  7. According to claim 1 can with the LED power circuit of conventional fluorescent lamp ballast compatibility, it is characterized in that: after the anode of described diode D5 is connected with the negative electrode of diode D6, be connected with one end of capacitor C 3, the other end of capacitor C 3 is connected with one end of inductance L 1, the other end of inductance L 1 is connected with the mid point of inductance L 2, the two ends of inductance L 2 are connected with input terminal Tb1, Tb2 respectively, inductance L 1 can share a magnetic core with L2, also an independent magnetic core separately.
CN201320867338.8U 2013-12-26 2013-12-26 LED power supply circuit capable of being compatible with traditional fluorescent lamp ballast Expired - Fee Related CN203645890U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104202863A (en) * 2013-12-26 2014-12-10 王兴利 LED (Light-Emitting Diode) power supply circuit compatible with conventional fluorescent lamp ballast
CN104470086A (en) * 2014-11-21 2015-03-25 浙江晨辉照明有限公司 LED lamp tube power driving circuit and LED lamp tube
CN105465642A (en) * 2014-09-28 2016-04-06 嘉兴山蒲照明电器有限公司 Light emitting diode lamp tube and emergency lamp device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104202863A (en) * 2013-12-26 2014-12-10 王兴利 LED (Light-Emitting Diode) power supply circuit compatible with conventional fluorescent lamp ballast
CN105465642A (en) * 2014-09-28 2016-04-06 嘉兴山蒲照明电器有限公司 Light emitting diode lamp tube and emergency lamp device
CN105465642B (en) * 2014-09-28 2023-12-26 嘉兴山蒲照明电器有限公司 LED lamp tube and emergency lighting lamp device
CN104470086A (en) * 2014-11-21 2015-03-25 浙江晨辉照明有限公司 LED lamp tube power driving circuit and LED lamp tube

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