CN201639829U - Multi-resonance circuit applicable to multi-path LED accurate constant-current drive - Google Patents
Multi-resonance circuit applicable to multi-path LED accurate constant-current drive Download PDFInfo
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- CN201639829U CN201639829U CN2010201404334U CN201020140433U CN201639829U CN 201639829 U CN201639829 U CN 201639829U CN 2010201404334 U CN2010201404334 U CN 2010201404334U CN 201020140433 U CN201020140433 U CN 201020140433U CN 201639829 U CN201639829 U CN 201639829U
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Abstract
The utility model discloses a multi-resonance circuit applicable to a multi-path LED accurate constant-current drive, comprising a high-frequency pulse alternating-current source, an impedance network, a resonance capacitor, a high-frequency transformer, two paths of rectifying filter circuits and LED loads, wherein a high-frequency resonance capacitor and the impedance network form a high-frequency resonance network which participates in resonance transformation of a main circuit and plays a role of stopping, namely, balances the voltage difference of the two paths of LED loads and leads the average current flowing through the two paths of LED loads to be equal; and under ideal condition, when the voltage drops of the two paths of LEDs are completely equal, the voltages of two ends of the resonance capacitor are zero. The multi-resonance circuit has the benefits of: 1. realizing equal current of the loads among the multiple paths LEDs by a primary conversion circuit, and having low cost, no need of extra control circuit and high reliability; 2. having high current-equalizing accuracy and no influence of voltage difference of the LED loads; 3. having high efficiency for realizing equal current by a stopping capacitor, and realizing less loss of equal current even though the voltage difference of the two paths of LEDs is larger.
Description
Technical field
The utility model relates to a kind of circuit that can realize that the LED accurate constant current drives.Should be a kind of multicomponent resonant circuit specifically, realize two-way or LED multi-path load constant-current driving.
Background technology
For the application of LED multiple constant current Control Driver, the most frequently used scheme has: 1. constant voltage module+multichannel non-isolation DC/DC constant-current circuit (as the BUCK circuit); 2. the adjustable Voltage stabilizing module of voltage+multi-channel linear is adjusted constant-current circuit.
For first kind of scheme, with reference to Fig. 1, the output of constant voltage module is as the input of multiple constant current circuit, and every road constant-current circuit is done constant current control separately, is easy to guarantee the current-sharing of multichannel output current.But because the voltage of constant voltage module and the voltage of LED generally all have bigger pressure reduction, therefore the efficient of back level multichannel DC/DC constant-current circuit can be very not high, and the cost of multichannel constant-current control circuit is very high.
For second kind of scheme, with reference to Fig. 2, do linear the adjustment with metal-oxide-semiconductor or triode and realize multiple constant current control, the output voltage of prime Voltage stabilizing module is followed the linear circuit of adjusting of back level constant current, the output voltage of Voltage stabilizing module makes the linear circuit of adjusting can realize that in the output of every road the power consumption on the basis of accurate constant current control is approaching all the time minimum all the time than the highest Lu Lvegao of output voltage in the multi-channel linear adjustment constant-current circuit.Though this scheme circuit cost is low, the current sharing of every paths of LEDs is good, and short circuit is a LED common failure pattern, and when the pressure reduction of LED multi-path was bigger, the linear power consumption of adjusting pipe was very big, makes the led driver heating serious.
Summary of the invention
The utility model is at the problems referred to above, proposes a kind of multi resonant that can realize high precision constant current led drive circuit that shakes.This circuit efficiency height, cost are low, and current-sharing is functional, and when the pressure reduction of LED load was big, efficient also can be very high.
The technical scheme that addresses the above problem employing is: is applicable to the multi-resonant circuit that the two paths of LED accurate constant current drives, comprises the high frequency pulse AC source, and impedance network, first resonant capacitance, high frequency transformer, two-way current rectifying and wave filtering circuit and LED load is characterized in that:
The high frequency pulse AC source that is input as of described impedance network, its former limit of output termination high frequency transformer, a connect end of first resonant capacitance of secondary winding one end of described high frequency transformer, the other end of described first resonant capacitance and high frequency transformer secondary winding other end two-way current rectifying and wave filtering circuit in parallel;
Described two-way current rectifying and wave filtering circuit comprises be made up of respectively first diode, the 4th diode and second diode, the 3rd diode two independently half-wave rectifying circuits, and the 3rd filter capacitor and the 4th filter capacitor; Described two independently half-wave rectifying circuit is respectively to the two paths of LED electric, and described the 3rd filter capacitor and the 4th filter capacitor are connected in parallel on described two paths of LED load two ends respectively.。
The multi-resonant circuit that is applicable to that the two paths of LED accurate constant current drives of the present utility model, high frequency first resonant capacitance and impedance network are formed the high-frequency resonant network, participate in the resonant transformation of main circuit; On the other hand, also play every straight effect, promptly the voltage difference of balance two paths of LED load equates the average current that flows through the two paths of LED load, and ideally, when the two paths of LED pressure drop equated fully, the voltage at the high frequency first resonant capacitance two ends was zero.
The multi-resonant circuit that is applicable to that the two paths of LED accurate constant current drives of the present utility model, described two-way current rectifying and wave filtering circuit can be total to cloudy the connection or sun connection altogether with the LED load, the execution mode of a preferred sun altogether connection is: an end of a termination first resonant capacitance of described high frequency transformer secondary winding, the anode of another termination first diode of first resonant capacitance and the negative electrode of second diode, the anode and the 4th diode cathode of another termination the 3rd diode of high frequency transformer secondary winding, second diode, the anode of the 4th diode links to each other and connects LED load 1,2 negative terminal, the negative electrode of positive termination first diode of LED load 1, the negative electrode of positive termination the 3rd diode of LED load 2, the 3rd filter capacitor, the 4th filter capacitor 4 is connected in parallel on two paths of LED load 1 respectively, 2 two ends;
Another preferably cloudy altogether execution mode that connects, specifically: an end of a termination first resonant capacitance of described high frequency transformer secondary winding, the anode of another termination first diode of first resonant capacitance and the negative electrode of second diode, the anode and the 4th diode cathode of another termination the 3rd diode of high frequency transformer secondary winding, first diode, the negative electrode of the 3rd diode links to each other and connects LED load 1,2 anode, the negative terminal of LED load 1 connects the anode of second diode, the negative terminal of LED load 2 connects the anode of the 4th diode, the 3rd filter capacitor, the 4th filter capacitor is connected in parallel on the two ends of two paths of LED load respectively.
High-frequency resonant network of the present utility model can have various ways, one of them typical embodiment is: described high-frequency resonant network comprises first resonant inductance, second resonant inductance, first resonant capacitance, second resonant capacitance, described second resonant inductance is in parallel with the former limit of transformer, this parallel branch is connected with first resonant inductance and second resonant capacitance, and first resonant capacitance still is connected on the transformer secondary.Wherein first resonant inductance can be external independent inductance, also can be the leakage inductance of high frequency transformer T0.Second resonant inductance can be external independent inductance, also the magnetizing inductance of high frequency transformer.
As a kind of improvement, the high-frequency resonant network also can have only first resonant capacitance with the second resonant capacitance short circuit, first resonant inductance and second resonant inductance, and all the other connected modes are constant.
The another kind of high-frequency resonant network of the present utility model improves, the 3rd resonant inductance in parallel at the second resonant capacitance two ends, and all the other are constant.
The utility model also will provide a kind of multi-resonant circuit that is applicable to that odd number paths of LEDs accurate constant current drives, comprise the high frequency pulse AC source, impedance network, high frequency transformer, N-1 current-sharing transformer, circuit unit and N circuit unit that a N-1 structure is identical is characterized in that:
The high frequency pulse AC source that is input as of described impedance network, its output termination high frequency transformer former limit, described high frequency transformer) the secondary winding connect N circuit unit;
The identical circuit unit of described each structure comprises by first resonant capacitance, and first diode, the 4th diode and second diode, the 3rd diode form respectively two be half-wave rectifying circuit independently, and the 3rd filter capacitor and the 4th filter capacitor; Described two independently half-wave rectifying circuit give the two paths of LED electric respectively, described the 3rd filter capacitor and the 4th filter capacitor are connected in parallel on described two paths of LED load two ends respectively, and described the one the first resonant capacitances are connected on the input of current rectifying and wave filtering circuit; Described N circuit unit comprises a current rectifying and wave filtering circuit and a paths of LEDs load;
The secondary winding of high frequency transformer and wherein be connected in series two windings of current-sharing transformer in two circuit unit in-phase current branch roads respectively, the two-way in-phase current flows through the end of the same name and the non-same polarity of two windings of current-sharing transformer respectively; When the no-load voltage ratio of current-sharing transformer is n: m, the ratio that flows through the electric current of two winding ends of the same name of current-sharing transformer and non-same polarity is not equal to m: during n, then the exciting curent of current-sharing transformer is non-vanishing, the alternating voltage that exciting curent produces at the current-sharing transformer two ends is with the pressure reduction of two circuit units of autobalance, making the ratio balance of two winding currents of current-sharing transformer is m: n, thereby realizes the equilibrium control to two circuit unit electric currents; When m=n, realize the sharing control of two circuit units;
The equilibrium of N circuit unit electric current adopts N-1 current-sharing transformer according to identical method equilibrium, and wherein N is the positive integer more than or equal to 2.
The implementation of the high-frequency resonant network that first resonant capacitance of described impedance network and each circuit unit is formed can be that the front is applicable to any form of mentioning in the multi-resonant circuit of two paths of LED accurate constant current driving; Described two-way current rectifying and wave filtering circuit can be total to cloudy the connection or sun connection altogether with the LED load.
A kind of drive circuit of realizing odd number road accurate constant current of multiple LEDs of the present utility model in the identical circuit unit of N-1 structure, is realized the equilibrium of the two paths of LED load current in each circuit unit by first resonant capacitance; Realize the sharing control of per two circuit unit electric currents by N-1 current-sharing transformer, make the electric current of each circuit unit balanced in twos, thereby realize the current balance between all circuit units by N-1 current-sharing transformer.
The utility model also will provide a kind of multi-resonant circuit that is applicable to that even number paths of LEDs accurate constant current drives, and comprises the high frequency pulse AC source, impedance network, and high frequency transformer, N-1 current-sharing transformer and N the circuit unit that structure is identical is characterized in that:
The high frequency pulse AC source that is input as of described impedance network, its former limit of output termination high frequency transformer, the secondary winding of described high frequency transformer connects N circuit unit;
Described each circuit unit comprises by first resonant capacitance, and first diode, the 4th diode and second diode, the 3rd diode form respectively two be half-wave rectifying circuit independently, and the 3rd filter capacitor and the 4th filter capacitor; Described two independently half-wave rectifying circuit give the two paths of LED electric respectively, described the 3rd filter capacitor and the 4th filter capacitor are connected in parallel on described two paths of LED load two ends respectively, and described first resonant capacitance is connected on the input of current rectifying and wave filtering circuit;
The secondary winding of high frequency transformer and wherein be connected in series two windings of current-sharing transformer in two circuit unit in-phase current branch roads respectively, the two-way in-phase current flows through the end of the same name and the non-same polarity of two windings of current-sharing transformer respectively; When the no-load voltage ratio of current-sharing transformer is n: m, the ratio that flows through the electric current of two winding ends of the same name of current-sharing transformer and non-same polarity is not equal to m: during n, then the exciting curent of current-sharing transformer is non-vanishing, the alternating voltage that exciting curent produces at the current-sharing transformer two ends is with the pressure reduction of two circuit units of autobalance, making the ratio balance of two winding currents of current-sharing transformer is m: n, thereby realizes the equilibrium control to two circuit unit electric currents; When m=n, realize the sharing control of two circuit units;
The equilibrium of N circuit unit electric current adopts N-1 current-sharing transformer according to identical method equilibrium, and wherein N is the positive integer more than or equal to 2.
The implementation of the high-frequency resonant network that first resonant capacitance of described impedance network and each circuit unit is formed can be that the front is applicable to any form of mentioning in the multi-resonant circuit of two paths of LED accurate constant current driving; Described two-way current rectifying and wave filtering circuit can be total to cloudy the connection or common positive interconnection system with the LED load.
A kind of drive circuit of realizing even number road accurate constant current of multiple LEDs of the present utility model, realize the equilibrium of the two paths of LED load current in each circuit unit by resonant capacitance, realize the sharing control of two circuit unit electric currents by current-sharing transformer, make the electric current of each circuit unit balanced in twos by N-1 current-sharing transformer, thereby realize the current balance between all circuit units.The beneficial effects of the utility model are:
1. realize load current-sharing between LED multi-path by primary conversion circuit, cost is low, does not need extra control circuit, the reliability height.
2. current-sharing precision height is not influenced by LED load pressure reduction.
3. realize the efficient height of current-sharing by capacitance,, realize that the loss of current-sharing is also less even when two paths of LED pressure reduction is big.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 prior art circuits block diagram one.
Fig. 2 prior art circuits block diagram two.
Fig. 3 first kind of circuit block diagram of multi-resonant circuit that is applicable to that the two paths of LED accurate constant current drives of the present utility model.
Fig. 4 second kind of circuit block diagram of multi-resonant circuit that is applicable to that the two paths of LED accurate constant current drives of the present utility model.
First kind of execution mode of Fig. 5 impedance network of the present utility model.
Second kind of execution mode of Fig. 6 impedance network of the present utility model.
The third execution mode of Fig. 7 impedance network of the present utility model.
Fig. 8 first kind of circuit block diagram of multi-resonant circuit that is applicable to that three paths of LEDs accurate constant currents drive of the present utility model.
Fig. 9 second kind of circuit block diagram of multi-resonant circuit that is applicable to that three paths of LEDs accurate constant currents drive of the present utility model.
Figure 10 first kind of circuit block diagram of multi-resonant circuit that is applicable to that four paths of LEDs accurate constant currents drive of the present utility model.
Figure 11 second kind of circuit block diagram of multi-resonant circuit that is applicable to that four paths of LEDs accurate constant currents drive of the present utility model.
Figure 12 multi-resonant circuit block diagram that is applicable to that odd number paths of LEDs accurate constant current drives of the present utility model.
Figure 13 multi-resonant circuit block diagram that is applicable to that even number paths of LEDs accurate constant current drives of the present utility model.
Figure 14 two paths of LED load of the present utility model and be the specific embodiment of example with the half-bridge resonance circuit.
Figure 15 two paths of LED load of the present utility model and be the specific embodiment of example with the full-bridge resonant circuit.
Specific embodiment
With reference to Fig. 3, be applicable to first kind of circuit block diagram of multi-resonant circuit that the two paths of LED accurate constant current drives, comprise the high frequency pulse AC source, impedance network Z1, resonant capacitance C1, high frequency transformer T0, two-way current rectifying and wave filtering circuit and LED load, specifically: the high frequency pulse AC source that is input as of described impedance network Z1, its former limit of output termination high frequency transformer T0, the end of one termination resonant capacitance C1 of described high frequency transformer T0 secondary winding, the anode of another terminating diode D1 of resonant capacitance C1 and the negative electrode of diode D2, the anode of another terminating diode D3 of high frequency transformer secondary winding and diode D4 negative electrode, diode D2, the anode of D4 links to each other and connects LED load 1,2 negative terminal, the negative electrode of the positive terminating diode D1 of LED load 1, the negative electrode of the positive terminating diode D3 of LED load 2, filter capacitor C3, C4 is connected in parallel on two paths of LED load 1 respectively, 2 two ends.
With reference to Fig. 4, be applicable to second kind of circuit block diagram of multi-resonant circuit that the two paths of LED accurate constant current drives, comprise the high frequency pulse AC source, impedance network Z1, resonant capacitance C1, high frequency transformer T0, two-way current rectifying and wave filtering circuit and LED load, specifically: the high frequency pulse AC source that is input as of described impedance network Z1, its former limit of output termination high frequency transformer T0, the end of one termination resonant capacitance C1 of described high frequency transformer T0 secondary winding, the anode of another terminating diode D1 of resonant capacitance C1 and the negative electrode of diode D2, the anode of another terminating diode D3 of high frequency transformer T0 secondary winding and diode D4 negative electrode, diode D1, the negative electrode of D3 links to each other and connects LED load 1,2 anode, the negative terminal of LED load 1 connects the anode of diode D2, the negative terminal of LED load 2 connects the anode of diode D4, filter capacitor C3, C4 is connected in parallel on the two ends of two paths of LED load respectively.
With reference to Fig. 5, first kind of execution mode of impedance network of the present utility model, specifically: described high-frequency resonant network comprises the first resonant inductance L1, the second resonant inductance L2, resonant capacitance C1, C2, described inductance L 2 is in parallel with the former limit of transformer T0, this parallel branch is connected with inductance L 1 and capacitor C 2, and resonant capacitance C1 still is connected on transformer T0 secondary.Wherein L1 can be external independent inductance, also can be the leakage inductance of high frequency transformer T0.Inductance L 2 can be external independent inductance, also the magnetizing inductance of high frequency transformer T0.
With reference to Fig. 6, second kind of execution mode of impedance network of the present utility model, different with Fig. 5 is, with the resonant capacitance C2 short circuit among Fig. 5.
With reference to Fig. 7, the third execution mode of impedance network of the present utility model, different with Fig. 5 is, with resonant capacitance C2 two ends parallel resonant inductor L3 among Fig. 5.
With reference to Fig. 8, first kind of circuit block diagram of multi-resonant circuit that is applicable to that three paths of LEDs accurate constant currents drive of the present utility model, comprise the high frequency pulse AC source, impedance network Z1, resonant capacitance C1, high frequency transformer T0, three road current rectifying and wave filtering circuits and LED load, specifically: the high frequency pulse AC source that is input as of described impedance network Z1, its former limit of output termination high frequency transformer T0, described current-sharing transformer T1 comprises two winding W1 and W2, described high frequency transformer T0 secondary has a winding, the end of the same name of one termination winding W1 of transformer T0 secondary winding and the non-same polarity of winding W2, the non-same polarity of winding W1 connects the end of resonant capacitance C1, (this circuit unit is two-way current rectifying and wave filtering circuit and corresponding two paths of LED load to the other end of resonant capacitance C1 and a transformer T0 secondary other end circuit unit in parallel, its connected mode can be common the moon or sun connection altogether, down together), the other end of the end of the same name of winding W2 and transformer T0 secondary one road current rectifying and wave filtering circuit in parallel and a paths of LEDs load.
With reference to Fig. 9, second kind of circuit block diagram of multi-resonant circuit that is applicable to that three paths of LEDs accurate constant currents drive of the present utility model, comprise the high frequency pulse AC source, impedance network Z1, resonant capacitance C1, high frequency transformer T0, three road current rectifying and wave filtering circuits and LED load, specifically: the high frequency pulse AC source that is input as of described impedance network Z1, its former limit of output termination high frequency transformer T0, described current-sharing transformer T1 comprises two winding W1 and W2, described high frequency transformer T0 secondary has two winding W
T1And W
T2, winding W
T1The end of the same name of termination winding W1 of the same name, winding W
T2The non-same polarity of termination winding W2 of the same name, the non-same polarity of winding W1 connects the end of resonant capacitance C1, the other end of resonant capacitance C1 and winding W
T1Non-same polarity circuit unit in parallel, the end of the same name of winding W2 and winding W
T2Non-same polarity one road current rectifying and wave filtering circuit in parallel and a paths of LEDs load.
With reference to Figure 10, first kind of circuit block diagram of multi-resonant circuit that is applicable to that four paths of LEDs accurate constant currents drive of the present utility model, comprise the high frequency pulse AC source, impedance network Z1, resonant capacitance C1, C2, high frequency transformer T0, four road current rectifying and wave filtering circuits and LED load, specifically: the high frequency pulse AC source that is input as of described impedance network Z1, its former limit of output termination high frequency transformer T0, described current-sharing transformer T1 comprises two winding W1 and W2, described high frequency transformer T0 secondary has a winding, the end of the same name of one termination winding W1 of transformer T0 secondary winding and the non-same polarity of winding W2, the non-same polarity of winding W1 connects the end of resonant capacitance C1, the other end of resonant capacitance C1 and transformer T0 secondary other end circuit unit in parallel, the end of the termination resonant capacitance C2 of the same name of winding W2, the other end of the other end of resonant capacitance C2 and transformer T0 secondary another circuit unit in parallel.
With reference to Figure 11, second kind of circuit block diagram of multi-resonant circuit that is applicable to that four paths of LEDs accurate constant currents drive of the present utility model, comprise the high frequency pulse AC source, impedance network Z1, resonant capacitance C1, C2, high frequency transformer T0, four road current rectifying and wave filtering circuits and LED load, specifically: the high frequency pulse AC source that is input as of described impedance network Z1, its former limit of output termination high frequency transformer T0, described current-sharing transformer T1 comprises two winding W1 and W2, and described high frequency transformer T0 secondary has two winding W
T1And W
T2, winding W
T1The end of the same name of termination winding W1 of the same name, winding W
T2The non-same polarity of termination winding W2 of the same name, the non-same polarity of winding W1 connects the end of resonant capacitance C1, the other end of resonant capacitance C1 and winding W
T1Non-same polarity circuit unit in parallel, the end of the same name of winding W2 and winding W
T2Non-same polarity another circuit unit in parallel.
With reference to Figure 12, the multi-resonant circuit block diagram that is applicable to that odd number paths of LEDs accurate constant current drives of the present utility model, comprise the high frequency pulse AC source, impedance network Z1, resonant capacitance C1, C2,, Cn, high frequency transformer T0,2N+1 road current rectifying and wave filtering circuit and the load of 2N+1 paths of LEDs, it is characterized in that: the high frequency pulse AC source that is input as of described impedance network Z1, its former limit of output termination high frequency transformer T0, transformer T0 secondary has N+1 winding, each is with a circuit unit winding of N wherein, obviously, each circuit unit has the two paths of LED load, and N+1 winding has a paths of LEDs load.Wherein, the current-sharing principle of each circuit unit was described in Fig. 3 or Fig. 4, repeated no more; Between N+1 winding equal stream mode then realize by N current-sharing transformer.
Described Figure 12 execution mode; all right N the winding of the secondary winding of its transformer T0; or N-1; or 1; equal stream mode between its winding unit can be Fig. 8 or the described execution mode of Fig. 9, that is: when realizing odd number paths of LEDs load current balanced, the equal stream mode of all permutation and combination of Fig. 8 and Fig. 9 is all within the protection range of this patent.
With reference to Figure 13, the multi-resonant circuit block diagram that is applicable to that even number paths of LEDs accurate constant current drives of the present utility model comprises the high frequency pulse AC source, impedance network Z1, resonant capacitance C1, C2 ..., Cn, high frequency transformer T0,2N road current rectifying and wave filtering circuit and the load of 2N paths of LEDs is characterized in that: the high frequency pulse AC source that is input as of described impedance network Z1, its former limit of output termination high frequency transformer T0, transformer T0 secondary has N winding, and wherein each winding has a circuit unit.Obviously, each circuit unit has the two paths of LED load.Wherein, the current-sharing principle of each circuit unit was described in Fig. 3 or Fig. 4, repeated no more; Equal stream mode between N winding is then realized by N-1 current-sharing transformer.
Described Figure 13 execution mode; all right N-1 the winding of the secondary winding of its transformer T0; or N-2; or 1; equal stream mode between its circuit unit can be Fig. 8 or the described execution mode of Fig. 9, that is: when realizing even number paths of LEDs load current balanced, the equal stream mode of all permutation and combination of Fig. 8 and Fig. 9 is all within the protection range of this patent.
In Fig. 8-Figure 13 execution mode, the implementation of the high-frequency resonant network of being made up of the resonant capacitance C1 of impedance network Z1 and each circuit unit can be any version among Fig. 5, Fig. 6, Fig. 7.
With reference to Figure 14, two paths of LED load of the present utility model and be the specific embodiment of example with the half-bridge resonance circuit, specifically: input voltage is direct voltage Vdc, first end of its positive termination switching tube S1, first end of the second termination switching tube S2 of switch S 1 and an end of inductance L 1, another termination transformer T1 former limit winding end of the same name of inductance L 1, the former limit of transformer T1 winding non-same polarity connects an end of capacitor C 2, the negative terminal of the second termination direct voltage Vdc of the other end of capacitor C 2 and switching tube S2, the end of transformer T1 secondary winding termination capacitor C1 of the same name, another termination of capacitor C 1 connects the anode of diode D1 and the negative electrode of diode D2, the non-same polarity of high frequency transformer T1 secondary winding connects anode and the diode D4 negative electrode of diode D3, diode D2, the anode of D4 links to each other and connects LED load 1,2 negative terminal, the negative electrode of the positive terminating diode D1 of LED load 1, the negative electrode of the positive terminating diode D3 of LED load 2, filter capacitor C3, C4 is connected in parallel on two paths of LED load 1 respectively, 2 two ends.
Figure 15 two paths of LED load of the present utility model and be the specific embodiment of example with the full-bridge resonant circuit, specifically: input voltage is direct voltage Vdc, first end of its positive termination switching tube S1 and first end of switching tube S3, first end of the second termination switching tube S2 of switch S 1 and an end of capacitor C 2, one end of the first termination inductance L 1 of the second termination switching tube S4 of switch S 3, another termination transformer T1 former limit winding end of the same name of inductance L 1, the former limit of transformer T1 winding non-same polarity connects the other end of capacitor C 2, the negative terminal of the second termination direct voltage Vdc of switching tube S2 and switching tube S4, the end of transformer T1 secondary winding termination capacitor C1 of the same name, another termination of capacitor C 1 connects the anode of diode D1 and the negative electrode of diode D2, the non-same polarity of high frequency transformer T1 secondary winding connects anode and the diode D4 negative electrode of diode D3, diode D2, the anode of D4 links to each other and connects LED load 1,2 negative terminal, the negative electrode of the positive terminating diode D1 of LED load 1, the negative electrode of the positive terminating diode D3 of LED load 2, filter capacitor C3, C4 is connected in parallel on two paths of LED load 1 respectively, 2 two ends.
What should be understood that is: the foregoing description is just to explanation of the present utility model, rather than to restriction of the present utility model, any utility model that does not exceed in the utility model connotation scope is created, and all falls within the protection range of the present utility model.
Claims (9)
1. be applicable to the multi-resonant circuit that the two paths of LED accurate constant current drives, comprise the high frequency pulse AC source, impedance network (Z1), first resonant capacitance (C1), high frequency transformer (T0), two-way current rectifying and wave filtering circuit and LED load is characterized in that:
The high frequency pulse AC source that is input as of described impedance network (Z1), its former limit of output termination high frequency transformer (T0), a connect end of first resonant capacitance (C1) of secondary winding one end of described high frequency transformer (T0), the other end of described first resonant capacitance (C1) and high frequency transformer (T0) secondary winding other end two-way current rectifying and wave filtering circuit in parallel;
Described two-way current rectifying and wave filtering circuit comprises be made up of respectively first diode (D1), the 4th diode (D4) and second diode (D2), the 3rd diode (D3) two independently half-wave rectifying circuits, and the 3rd filter capacitor (C3) and the 4th filter capacitor (C4); Described two independently half-wave rectifying circuit is respectively to the two paths of LED electric, and described the 3rd filter capacitor (C3) and the 4th filter capacitor (C4) are connected in parallel on described two paths of LED load two ends respectively.
2. the multi-resonant circuit that is applicable to that the two paths of LED accurate constant current drives as claimed in claim 1 is characterized in that described two-way current rectifying and wave filtering circuit and LED load are total to cloudy the connection or positive altogether the connection.
3. be applicable to the multi-resonant circuit that odd number paths of LEDs accurate constant current drives, comprise the high frequency pulse AC source, impedance network (Z1), high frequency transformer (T0), N-1 current-sharing transformer, circuit unit and N circuit unit that a N-1 structure is identical is characterized in that:
The high frequency pulse AC source that is input as of described impedance network (Z1), its former limit of output termination high frequency transformer (T0), the secondary winding of described high frequency transformer (T0) connects N circuit unit;
The identical circuit unit of described each structure comprises by first resonant capacitance (C1), first diode (D1), the 4th diode (D4) and second diode (D2), the 3rd diode (D3) form respectively two be half-wave rectifying circuit independently, and the 3rd filter capacitor (C3) and the 4th filter capacitor (C4); Described two independently half-wave rectifying circuit give the two paths of LED electric respectively, described the 3rd filter capacitor (C3) and the 4th filter capacitor (C4) are connected in parallel on described two paths of LED load two ends respectively, and described first resonant capacitance (C1) is connected on the input of current rectifying and wave filtering circuit; Described N circuit unit comprises a current rectifying and wave filtering circuit and a paths of LEDs load;
The secondary winding of high frequency transformer (T0) and wherein be connected in series two windings of current-sharing transformer in two circuit unit in-phase current branch roads respectively, the two-way in-phase current flows through the end of the same name and the non-same polarity of two windings of current-sharing transformer respectively; When the no-load voltage ratio of current-sharing transformer is n: m, the ratio that flows through the electric current of two winding ends of the same name of current-sharing transformer and non-same polarity is not equal to m: during n, then the exciting curent of current-sharing transformer is non-vanishing, the alternating voltage that exciting curent produces at the current-sharing transformer two ends is with the pressure reduction of two circuit units of autobalance, making the ratio balance of two winding currents of current-sharing transformer is m: n, thereby realizes the equilibrium control to two circuit unit electric currents; When m=n, realize the sharing control of two circuit units;
The equilibrium of N circuit unit electric current adopts N-1 current-sharing transformer according to identical method equilibrium, and wherein N is the positive integer more than or equal to 2.
4. the multi-resonant circuit that is applicable to that odd number paths of LEDs accurate constant current drives as claimed in claim 3 is characterized in that the cloudy altogether connection of described each circuit unit or is total to sun connecting.
5. be applicable to the multi-resonant circuit that even number paths of LEDs accurate constant current drives, comprise the high frequency pulse AC source, impedance network (Z1), high frequency transformer (T0), N-1 current-sharing transformer and N the circuit unit that structure is identical is characterized in that:
The high frequency pulse AC source that is input as of described impedance network (Z1), its former limit of output termination high frequency transformer (T0), the secondary winding of described high frequency transformer (T0) connects N circuit unit;
Described each circuit unit comprises by first resonant capacitance (C1), first diode (D1), the 4th diode (D4) and second diode (D2), the 3rd diode (D3) form respectively two be half-wave rectifying circuit independently, and the 3rd filter capacitor (C3) and the 4th filter capacitor (C4); Described two independently half-wave rectifying circuit give the two paths of LED electric respectively, described the 3rd filter capacitor (C3) and the 4th filter capacitor (C4) are connected in parallel on described two paths of LED load two ends respectively, and described first resonant capacitance (C1) is connected on the input of current rectifying and wave filtering circuit;
The secondary winding of high frequency transformer (T0) and wherein be connected in series two windings of current-sharing transformer in two circuit unit in-phase current branch roads respectively, the two-way in-phase current flows through the end of the same name and the non-same polarity of two windings of current-sharing transformer respectively; When the no-load voltage ratio of current-sharing transformer is n: m, the ratio that flows through the electric current of two winding ends of the same name of current-sharing transformer and non-same polarity is not equal to m: during n, then the exciting curent of current-sharing transformer is non-vanishing, the alternating voltage that exciting curent produces at the current-sharing transformer two ends is with the pressure reduction of two circuit units of autobalance, making the ratio balance of two winding currents of current-sharing transformer is m: n, thereby realizes the equilibrium control to two circuit unit electric currents; When m=n, realize the sharing control of two circuit units;
The equilibrium of N circuit unit electric current adopts N-1 current-sharing transformer according to identical method equilibrium, and wherein N is the positive integer more than or equal to 2.
6. the multi-resonant circuit that is applicable to that even number paths of LEDs accurate constant current drives as claimed in claim 5 is characterized in that the cloudy altogether connection of described each circuit unit or is total to sun connecting.
7. as the described multi-resonant circuit of claim 1-6, it is characterized in that described first resonant capacitance (C1) and impedance network (Z1) composition high-frequency resonant network, described high-frequency resonant network comprises first resonant inductance (L1), second resonant inductance (L2), first resonant capacitance (C1), second resonant capacitance (C2), described second resonant inductance (L2) is in parallel with the former limit of transformer (T0), this parallel branch is connected with first resonant inductance (L1) and second resonant capacitance (C2), and first resonant capacitance (C1) is connected on transformer (T0) secondary.
8. as the described multi-resonant circuit of claim 1-6, it is characterized in that described first resonant capacitance (C1) and impedance network (Z1) composition high-frequency resonant network, described high-frequency resonant network comprises first resonant inductance (L1), second resonant inductance (L2), first resonant capacitance (C1), described second resonant inductance (L2) is in parallel with the former limit of transformer (T0), this parallel branch is connected with first resonant inductance (L1), and first resonant capacitance (C1) is connected on transformer (T0) secondary.
9. as the described multi-resonant circuit of claim 1-6, it is characterized in that described first resonant capacitance (C1) and impedance network (Z1) composition high-frequency resonant network, described high-frequency resonant network comprises the 3rd resonant inductance (L3), first resonant inductance (L1), second resonant inductance (L2), first resonant capacitance (C1), second resonant capacitance (C2), described second resonant inductance (L2) is in parallel with the former limit of transformer (T0), described second resonant capacitance (C2) and 1 parallel connection of resonance inductance L, these two parallel branches and first resonant inductance (L1) series connection, first resonant capacitance (C1) is connected on transformer (T0) secondary.
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| CN2010201404334U CN201639829U (en) | 2010-02-24 | 2010-02-24 | Multi-resonance circuit applicable to multi-path LED accurate constant-current drive |
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| CN2010201404334U CN201639829U (en) | 2010-02-24 | 2010-02-24 | Multi-resonance circuit applicable to multi-path LED accurate constant-current drive |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101772246A (en) * | 2010-02-24 | 2010-07-07 | 英飞特电子（杭州）有限公司 | Multi-resonance circuit suitable for LED multi-path precise constant current driver |
| CN103118460A (en) * | 2013-01-30 | 2013-05-22 | 福州大学 | Novel multi-path LED passive current-equalizing circuit and LED driving power source |
| CN103813589A (en) * | 2014-01-24 | 2014-05-21 | 东南大学 | Isolation type high-power light emitting diode (LED) driving power source with multi-output current sharing |
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| CN101772246A (en) * | 2010-02-24 | 2010-07-07 | 英飞特电子（杭州）有限公司 | Multi-resonance circuit suitable for LED multi-path precise constant current driver |
| CN101772246B (en) * | 2010-02-24 | 2013-01-16 | 英飞特电子（杭州）股份有限公司 | Multi-resonance circuit suitable for LED multi-path precise constant current driver |
| CN103118460A (en) * | 2013-01-30 | 2013-05-22 | 福州大学 | Novel multi-path LED passive current-equalizing circuit and LED driving power source |
| CN103118460B (en) * | 2013-01-30 | 2014-12-03 | 福州大学 | Novel multi-path LED passive current-equalizing circuit and LED driving power source |
| CN103813589A (en) * | 2014-01-24 | 2014-05-21 | 东南大学 | Isolation type high-power light emitting diode (LED) driving power source with multi-output current sharing |
| CN104219854A (en) * | 2014-09-26 | 2014-12-17 | 三峡大学 | Multiplexed output high-voltage-reduction LED constant-current driving power supply |
| CN106793290A (en) * | 2016-12-20 | 2017-05-31 | 福州大学 | A kind of isolated multipath flows LED drive power |
| CN106793290B (en) * | 2016-12-20 | 2018-08-17 | 福州大学 | A kind of isolated multipath flows LED drive power |
| CN107155244A (en) * | 2017-07-20 | 2017-09-12 | 东莞市紫能电子科技有限公司 | A kind of multi-channel LED current equalization drive circuit |
| WO2020073620A1 (en) * | 2018-10-08 | 2020-04-16 | 深圳市崧盛电子股份有限公司 | Multi-output constant current driving circuit, and driving power source |
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