CN101510723B - Multi-set DC laden current balance power supply circuit - Google Patents
Multi-set DC laden current balance power supply circuit Download PDFInfo
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- CN101510723B CN101510723B CN2008101282438A CN200810128243A CN101510723B CN 101510723 B CN101510723 B CN 101510723B CN 2008101282438 A CN2008101282438 A CN 2008101282438A CN 200810128243 A CN200810128243 A CN 200810128243A CN 101510723 B CN101510723 B CN 101510723B
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Abstract
The invention relates to a current balance power supply circuit of a multi-unit DC (direct current) load, which is used for driving the multi-unit DC load and ensures same luminosity. The current balance power supply circuit includes: a current supply circuit, which is used for receiving the power supply and providing the power for the multi-unit DC load; a current share circuit, which is connected in series with the current supply circuit and the multi-unit DC load and is used for balancing the multi-unit DC load and includes a plurality of inductor units; and a current control unit, which is connected with the current power supply circuit and at least one unit of DC load and is used for detecting the current of the multi-unit DC load and controlling the output current of the current power supply circuit. Among the inductor units, each inductor unit includes coupling inductors among which each coupling inductor includes a plurality of inductors and inductors of coupling inductors in each inductor unit are connected in series with each other and correspondingly connected in series with one unit of DC load. The circuit ensures the current balance of each unit of DC load and equal luminous intensity, and is characterized by low circuit power loss, high efficiency of the circuit and less complexity of the circuit with less elements and can save cost.
Description
Technical field
The present invention relates to a kind of power supply circuits, relate in particular to a kind of current-balancing supply circuit of multi-set DC laden.
Background technology
In recent years because light-emitting diode (Light Emitting Diode, LED) breakthrough of manufacturing technology, make the luminosity and the luminous efficiency of light-emitting diode significantly promote, thereby make light-emitting diode replace traditional fluorescent tube gradually and become new illumination component, be widely used in for example illuminations such as home lighting device, car headlight device, hand-held lighting device, liquid crystal panel backlight, traffic sign indicator light, indication billboard and use.
Light-emitting diode is a DC load, at present in the application of multiple optical diode, because the characteristic of each light-emitting diode differs from one another, the size of current of feasible each light-emitting diode of flowing through all is not quite similar, so not only cause using the electronic installation of light-emitting diode, panel of LCD for example, luminosity is inhomogeneous, also can make significantly reduce the useful life of indivedual light-emitting diodes, and then make whole electronic installation suffer damage.
In order to improve the uneven problem of led current, there have been many led current balancing techniques to be used to improve this shortcoming.United States Patent (USP) card US6,621,235 disclose a kind of current-balancing supply circuit of multi-group light-emitting diode, and as shown in Figure 1, this traditional current-balancing supply circuit comprises linear voltage adjuster 11 (linear regulator), low pass filter 12 and a plurality of current mirror M
1～M
nWherein, the reference current I of the first input end of linear voltage adjuster 11 connection
RefFor deciding electric current, produce corresponding output voltage to low pass filter 12, via outputing to current mirror M again after low pass filter 12 filtering in order to control linear voltage adjuster 11
1～M
nGate terminal, make each current mirror M
1～M
nExport identical electric current, therefore, every group is connected in current mirror M
1～M
nLight-emitting diode have same current and luminosity.
Yet the current-balancing supply circuit of traditional multi-group light-emitting diode uses linear voltage adjuster and current mirror, makes that the circuit power loss is big and the circuit operational efficiency is low, uses more element and circuit complicated relatively.Therefore, how to develop a kind of current-balancing supply circuit that improves the multi-set DC laden of above-mentioned known technology shortcoming, real problem for those skilled in the art's solution that presses at present.
Summary of the invention
Main purpose of the present invention is to provide a kind of current-balancing supply circuit of multi-set DC laden, utilization is different from the line construction of traditional multi-set DC laden power supply circuits, make the current balance type and the luminosity of each group DC load identical, more make the little and circuit operational efficiency height of circuit power loss, use less elements and circuit complexity low relatively, and can save significantly cost.
For reaching above-mentioned purpose, a current-balancing supply circuit that provides a kind of multi-set DC laden than broad sense embodiment of the present invention in order to drive multi-set DC laden, makes the luminosity of each group DC load identical in fact.The current-balancing supply circuit of this multi-set DC laden comprises at least: current suppling circuit, in order to receive power supply and to be converted to the electric current of specific currents size, to offer this multi-set DC laden; Flow equalizing circuit, be connected in series with output and this multi-set DC laden of this current suppling circuit, size of current in order to this multi-set DC laden of balance, and this flow equalizing circuit comprises many group inductive bank, each group inductive bank comprises at least one coupling inductance, each coupling inductance comprises a plurality of inductance, and at least one inductance of this coupling inductance of each group inductive bank of wherein many group inductive bank is serial connection mutually each other, and with multi-set DC laden wherein one group be connected in series accordingly; And current control unit, be connected in this current suppling circuit and this multi-set DC laden at least one group, in order to size of current that detects this multi-set DC laden and the output current of controlling this current suppling circuit.
In the current-balancing supply circuit of above-mentioned multi-set DC laden, also comprise a plurality of rectifiers, be connected in series with output, this flow equalizing circuit and this multi-set DC laden of this current suppling circuit respectively.
In the current-balancing supply circuit of above-mentioned multi-set DC laden, these a plurality of rectifiers are serially connected with respectively between the output and this flow equalizing circuit of this current suppling circuit, or are serially connected with respectively between this flow equalizing circuit and this multi-set DC laden.
In the current-balancing supply circuit of above-mentioned multi-set DC laden, also comprise power rectifier circuit, be connected in the input of this current suppling circuit, in order to receive AC power and to be converted to this power supply to this current suppling circuit.
In the current-balancing supply circuit of above-mentioned multi-set DC laden, also comprise filter circuit, be connected in the input of this current suppling circuit.
In the current-balancing supply circuit of above-mentioned multi-set DC laden, also comprise a plurality of electric capacity, be connected to this multi-set DC laden.
In the current-balancing supply circuit of above-mentioned multi-set DC laden, this current suppling circuit comprises at least: switching circuit, comprise at least one switch element, and be connected in the input of this current control unit and this current suppling circuit; And transformer, comprising elementary coiling and organize secondary rolling thread more, this elementary coiling is connected in the input of this switching circuit and this current suppling circuit.
In the current-balancing supply circuit of above-mentioned multi-set DC laden, this switching circuit is formed by first switch element, this current control unit is controlled this first switch element conducting or is ended, with this power supply be sent to this transformer should many group secondary rolling threads, and wherein this transformer should many group secondary rolling threads each group secondary rolling threads identical with the turn ratio of this elementary coiling.
In the current-balancing supply circuit of above-mentioned multi-set DC laden, this switching circuit comprises second switch element, the 3rd switch element, resonant inductance and resonant capacitance, wherein this second switch element and the 3rd switch element are connected with this input of this current control unit, this current suppling circuit respectively and in a string contact serial connection, and should the serial connection point with this elementary coiling of this transformer between be connected in series this resonant inductance and this resonant capacitance.
In the current-balancing supply circuit of above-mentioned multi-set DC laden, this current control unit is controlled this second switch element and the mutual conducting of the 3rd switch element or is ended, should many group secondary rolling threads with what this power supply is sent to this transformer, and wherein this transformer should many group secondary rolling threads each groups have centre cap respectively and be connected in contact altogether.
In the current-balancing supply circuit of above-mentioned multi-set DC laden, this flow equalizing circuit comprises many group inductive bank, and each group inductive bank comprises a coupling inductance, and each coupling inductance comprises two inductance.
In the current-balancing supply circuit of above-mentioned multi-set DC laden, all the other inductance of this coupling inductance of each group inductive bank of these many group inductive bank are connected in series respectively accordingly with all the other group DC load of this multi-set DC laden respectively.
In the current-balancing supply circuit of above-mentioned multi-set DC laden, this multi-set DC laden is a multi-group light-emitting diode, and the current-balancing supply circuit of this multi-set DC laden is the current-balancing supply circuit of multi-group light-emitting diode.
In the current-balancing supply circuit of above-mentioned multi-set DC laden, each group DC load of this multi-set DC laden has a plurality of DC load respectively.
In the current-balancing supply circuit of above-mentioned multi-set DC laden, this output current of this current suppling circuit is the pulsed electric current.For reaching above-mentioned purpose, of the present invention another provides a kind of flow equalizing circuit than broad sense embodiment, is used for current-balancing supply circuit, and wherein current-balancing supply circuit and current suppling circuit is arranged is used to provide the electric current of specific currents size to multi-set DC laden.Flow equalizing circuit of the present invention is connected in series with the output and the multi-set DC laden of current suppling circuit, and flow equalizing circuit of the present invention comprises at least: at least one group of inductive bank, each group inductive bank has at least one coupling inductance, each coupling inductance has a plurality of inductance, offers the size of current of multi-set DC laden in order to balance.
In above-mentioned flow equalizing circuit, this flow equalizing circuit comprises many group inductive bank, and each group inductive bank comprises a coupling inductance, and each coupling inductance comprises two inductance.
In above-mentioned flow equalizing circuit, at least one inductance of this coupling inductance of each group inductive bank of these many group inductive bank is serial connection mutually each other, and with this multi-set DC laden wherein one group be connected in series accordingly.
In above-mentioned flow equalizing circuit, all the other inductance of this coupling inductance of each group inductive bank of these many group inductive bank are connected in series respectively accordingly with all the other group DC load of this multi-set DC laden respectively.
Description of drawings
Fig. 1: be traditional led current balanced feeding circuit.
Fig. 2 A: be the circuit block diagram of the current-balancing supply circuit of the multi-group light-emitting diode of the preferred embodiment of the present invention.
Fig. 2 B: be the circuit block diagram of the current-balancing supply circuit of the multi-group light-emitting diode of another preferred embodiment of the present invention.
Fig. 3: be the details electrical block diagram of the current-balancing supply circuit of the multi-group light-emitting diode shown in Fig. 2 A.
Fig. 4: be the circuit diagram of the current-balancing supply circuit of the multi-group light-emitting diode of another preferred embodiment of the present invention.
Fig. 5: be the circuit diagram of an exemplary flow equalizing circuit of the current-balancing supply circuit of the multi-group light-emitting diode of the preferred embodiment of the present invention.
Fig. 6: be the circuit diagram of an exemplary flow equalizing circuit of the current-balancing supply circuit of the multi-group light-emitting diode of another preferred embodiment of the present invention.
Fig. 7: be the circuit diagram of another exemplary flow equalizing circuit embodiment illustrated in fig. 6.
Fig. 8: be the circuit diagram of an exemplary flow equalizing circuit of the current-balancing supply circuit of the multi-group light-emitting diode of the another preferred embodiment of the present invention.
Fig. 9: be the circuit diagram of another variation example embodiment illustrated in fig. 8.
Figure 10: it is the circuit diagram of an exemplary flow equalizing circuit of current-balancing supply circuit of the multi-group light-emitting diode of another preferred embodiment of the present invention.
Figure 11: it is the circuit diagram of another embodiment of flow equalizing circuit structure shown in Figure 10.
Wherein, description of reference numerals is as follows:
11: linear voltage adjuster 12: low pass filter
2: the current-balancing supply circuit of multi-group light-emitting diode
21: current suppling circuit 211: switching circuit
22: flow equalizing circuit 23: current control unit
24: power rectifier circuit 25: filter circuit
222: the second groups of inductive bank of 221: the first groups of inductive bank
Three groups of inductive bank 22x: x organized inductive bank in 223: the
22 (n-2): (n-2) organizes inductive bank 22 (n-1): (n-1) organizes inductive bank
V
1: power supply V
In: AC power
D
1～D
n: rectifier G
1a～G
Nb: light-emitting diode
C
1～C
n: capacitor C
In: input capacitance
T
1: the first transformer T
2: second transformer
N
11, N
21: elementary coiling N
12, N
22: first secondary winding
N
13, N
23: second subprime coiling M
1～M
n: current mirror
Q
1: the first switch element Q
2: the second switch element
Q
3: the 3rd switch element L
r: resonant inductance
C
r: resonant capacitance k: serial connection point
L
C1, L
C2, L
C3, L
Cx～L
C (n-2), L
C (n-1): coupling inductance
L
C11, L
C21, L
C31～L
C (n-2) 1, L
C (n-1) 1: first inductance
L
C12, L
C22, L
C32～L
C (n-1) 2: second inductance
L
C13: the 3rd inductance L
C14: the 4th inductance
Embodiment
Some exemplary embodiments that embody feature of the present invention and advantage will be described in detail in the explanation of back segment.Be understood that the present invention can have various variations different in form, it does not all depart from the scope of the present invention, and explanation wherein and the accompanying drawing usefulness that ought explain in itself, but not in order to restriction the present invention.
The current-balancing supply circuit of multi-set DC laden of the present invention can be in order to drive multi-set DC laden and can make the current balance type of multi-set DC laden, make the luminosity of each group DC load identical in fact, wherein multi-set DC laden can be for example multi-group light-emitting diode, but not as limit, and each group light-emitting diode can have a plurality of light-emitting diodes, and for example each group light-emitting diode can be had two light-emitting diodes.Below will as the demonstration example of the current-balancing supply circuit of multi-set DC laden the technology of the present invention be described with the current-balancing supply circuit of multi-group light-emitting diode.Please refer to Fig. 2 A, it is the circuit block diagram of current-balancing supply circuit of the multi-group light-emitting diode of the preferred embodiment of the present invention.Shown in Fig. 2 A, the current-balancing supply circuit 2 of multi-group light-emitting diode comprises current suppling circuit 21, flow equalizing circuit 22 and current control unit 23 at least, and wherein current suppling circuit 21 is in order to receive power supply V
1, DC power supply for example, and the electric current that is converted to the specific currents size is to offer multi-group light-emitting diode G
1a～G
NbElectric weight, n representative group number wherein, a, b are represented first light-emitting diode and second light-emitting diode in this group respectively.Flow equalizing circuit 22 comprises at least one coupling inductance, the output and the multi-group light-emitting diode G of itself and current suppling circuit 21
1a～G
NbSerial connection is in order to balance multi-group light-emitting diode G
1a～G
NbSize of current.Current control unit 23 is connected in current suppling circuit 21 and multi-group light-emitting diode G
1a～G
NbAt least one group, in order to detect multi-group light-emitting diode G
1a～G
NbSize of current and the output current of Control current power supply circuits 21, in the present embodiment, current control unit 23 is serially connected with for example multi-group light-emitting diode G
1a～G
NbFirst group of light-emitting diode G
1a～G
1b, detecting the wherein size of current of one group of light-emitting diode, and then control flows is through multi-group light-emitting diode G
1a～G
NbSize of current.In certain embodiments, current suppling circuit 21 can be for example isolated or non-isolated current suppling circuit, but not as limit.
In certain embodiments, the current-balancing supply circuit 2 of multi-group light-emitting diode of the present invention also comprises a plurality of rectifier D
1～D
n, power rectifier circuit 24, filter circuit 25 and a plurality of capacitor C
1～C
n, wherein a plurality of rectifier D
1～D
nCan be for example diode, its respectively with output, flow equalizing circuit 22 and the multi-group light-emitting diode G of current suppling circuit 21
1a～G
NbSerial connection makes that the output current direction of current suppling circuit 21 is a single direction, for example flows to multi-group light-emitting diode G by current suppling circuit 21
1a～G
Nb, in addition, change in the example at some, can change a plurality of rectifier D
1～D
nSingle or multiple connection polarity, and corresponding should single group or multi-group light-emitting diode G
1a～G
NbAlso change it simultaneously and connect polarity, to adjust the sense of current of each group light-emitting diode respectively or simultaneously.
Please refer to Fig. 3, it is the details electrical block diagram of the current-balancing supply circuit of the multi-group light-emitting diode shown in Fig. 2 A.As shown in Figure 3, current suppling circuit 21 can be for example isolated current suppling circuit and comprises input capacitance C at least
In, switching circuit 211 and the first transformer T
1, input capacitance C wherein
InBe connected in the input of current suppling circuit 21.Switching circuit 211 is connected in input capacitance C
In, current control unit 23, current suppling circuit 21 the input and the first transformer T
1Elementary coiling N
11, wherein switching circuit 211 is made up of at least one switch element, and by current control unit 23 its operations of control.In the present embodiment, switching circuit 211 is by the first switch element Q
1Form, and current control unit 23 can the control first switch element Q
1Conducting or end, and with power supply V
1Electric energy be sent to the first transformer T with for example pulse type
1First secondary winding N
12And second subprime coiling N
13, therefore, the first transformer T
1First secondary winding N
12And second subprime coiling N
13Can respond to and export for example pulse type electric current, owing to first secondary winding N
12With elementary coiling N
11Turn ratio (turn ratio) be same as second subprime coiling N
13With elementary coiling N
11Turn ratio, so, first output of current suppling circuit 21 and second output, just first secondary winding N
12And second subprime coiling N
13Can respond to and export the pulse type electric current of close sizes values.
In the present embodiment, flow equalizing circuit 22 is by at least one first coupling inductance L
C1Constitute this first coupling inductance L
C1Have a plurality of inductance, for example first inductance L
C11And second inductance L
C12, first inductance L wherein
C11Be serially connected with first output, the first rectifier D in a plurality of outputs of current suppling circuit 21
1And first group of light-emitting diode G
1a～G
1bAnd constitute first current circuit.Second inductance L
C12Be serially connected with second output, the second rectifier D of current suppling circuit 21
2And second group of light-emitting diode G
2a～G
2bAnd constitute second current circuit.Utilize this flow equalizing circuit 22 to make and flow through first group of light-emitting diode G
1a～G
1bWith second group of light-emitting diode G
2a～G
2bElectric current can reach identical in fact, so can make first group of light-emitting diode G
1a～G
1bWith second group of light-emitting diode G
2a～G
2bLuminosity identical in fact.In certain embodiments, the current-balancing supply circuit 2 of multi-group light-emitting diode of the present invention also comprises a plurality of electric capacity, for example first capacitor C
1And second capacitor C
2Be connected to first group of light-emitting diode G
1a～G
1bWith second group of light-emitting diode G
2a～G
2b
Please refer to Fig. 4, it is the circuit diagram of the current-balancing supply circuit of the multi-set DC laden of another preferred embodiment of the present invention.As shown in Figure 4, in this embodiment, the flow equalizing circuit 22 of the current-balancing supply circuit 2 of multi-group light-emitting diode, current control unit 23, a plurality of rectifier D
1～D
4And a plurality of capacitor C
1～C
2Structure, function and principle similar in appearance to embodiment illustrated in fig. 3, therefore repeat no more.Have only current suppling circuit 21 to adopt different circuit structures and comprise switching circuit 211, this switching circuit 211 is by second switch element Q
2, the 3rd switch element Q
3, resonant inductance L
rAnd resonant capacitance C
rForm, wherein, second switch element Q
2And the 3rd switch element Q
3By after the serial connection point k serial connection again with the input and the input capacitance C of current suppling circuit 21
InConnect, and the serial connection point k and the second transformer T
2Elementary coiling N
21Between then be connected in series resonant inductance L
rAnd resonant capacitance C
r, with replacement second switch element Q
2And the 3rd switch element Q
3Reach the uneven energy that is produced when ending in conducting.The switching circuit 211 of present embodiment is similarly by 21 operations of current control unit 23 Control current power supply circuits, and in the present embodiment, current control unit 23 can control second switch element Q
2And the 3rd switch element Q
3Mutual conducting or end is with power supply V
1Electric energy be sent to the second transformer T with for example pulse type
2First secondary winding N
22And second subprime coiling N
23Though, the second transformer T
2First secondary winding N
22With elementary coiling N
21Turn ratio be same as second subprime coiling N
23With elementary coiling N
21Turn ratio, and the second transformer T
2First secondary winding N
22And second subprime coiling N
23Can respond to and export the pulse type electric current of close sizes values equally, still, the second transformer T
2First secondary winding N
22And second subprime coiling N
23Have centre cap (center tap) and be connected in common contact, therefore, the second transformer T
2First secondary winding N
22And second subprime coiling N
23Can respond to and export the output current of opposed polarity in different time.In the present embodiment, the second transformer T
2First secondary winding N
22Two ends be connected in series the first rectifier D respectively
1And the second rectifier D
2, and second subprime coiling N
23Two ends be serially connected with the 3rd rectifier D respectively
3And the 4th rectifier D
4, so that current suppling circuit 21 outputs to first group of light-emitting diode G
1a～G
1bWith second group of light-emitting diode G
2a～G
2bThe sense of current fix, promptly to the second transformer T
2First secondary winding N
22And second subprime coiling N
23The output current rectification.Wherein, first inductance L of flow equalizing circuit 22
C11With first group of light-emitting diode G
1a～G
1bConstitute first current circuit, and second inductance L
C12With second group of light-emitting diode G
2a～G
2bConstitute second current circuit.Flow equalizing circuit 22 is connected to first group of light-emitting diode G of first current circuit equally
1a～G
1bAnd second group of light-emitting diode G of second current circuit
2a～G
2b, and first capacitor C
1And second capacitor C
2Be connected to first group of light-emitting diode G equally
1a～G
1bWith second group of light-emitting diode G
2a～G
2b
Please refer to Fig. 5, it is the circuit diagram of an exemplary flow equalizing circuit of current-balancing supply circuit of the multi-group light-emitting diode of the preferred embodiment of the present invention.Current-balancing supply circuit 2 with multi-group light-emitting diode of the present invention is applied to drive for example four groups of light-emitting diode G
1a～G
4bBe example, as shown in Figure 5, flow equalizing circuit 22 is connected to four groups of light-emitting diode G
1a～G
4b, this flow equalizing circuit 22 is made of first group of inductive bank 221 and second group of inductive bank 222, and wherein first group of inductive bank 221 is by the first coupling inductance L with four inductance
C1Form (this first coupling inductance L
C1The inductance number identical with total group of number of multi-group light-emitting diode), and the inductance number of second group of inductive bank 222 is two, is less than the inductance number (the inductance number-2 of the inductance number=first group inductive bank 221 of this second group of inductive bank 222) of first group of inductive bank 221 with comparing.In the present embodiment, second group of inductive bank 222 is by the second coupling inductance L with two inductance
C2Form.Each inductance of first group of inductive bank 221 can constitute a current circuit with each group light-emitting diode respectively accordingly, the number of this current circuit is identical with the group number of multi-group light-emitting diode, and is connected in series corresponding each group light-emitting diode and each rectifier on each current circuit respectively.In the present embodiment, first inductance L in first group of inductive bank 221
C11, second inductance L
C12, the 3rd inductance L
C13And the 4th inductance L
C14Constitute first current circuit, second current circuit, the 3rd current circuit and the 4th current circuit respectively, and be connected in series first group of corresponding light-emitting diode G respectively on each current circuit
1a～G
1b, second group of light-emitting diode G
2a～G
2b, the 3rd group of light-emitting diode G
3a～G
3b, the 4th group of light-emitting diode G
4a～G
4b, the first rectifier D
1, the second rectifier D
2, the 3rd rectifier D
3And the 4th rectifier D
4Each inductance in second group of inductive bank 222 then relatively is connected in series with the partial inductance of first group of inductive bank 221 respectively, in the present embodiment, and first inductance L in second group of inductive bank 222
C21With second inductance L in first group of inductive bank 221 on second current circuit
C12222 second inductance L in the serial connection, second group of inductive bank
C22With the 3rd inductance L in first group of inductive bank 221 on the 3rd current circuit
C13Serial connection.In certain embodiments, the current-balancing supply circuit 2 of multi-group light-emitting diode of the present invention also comprises a plurality of capacitor C
1To C
4, be connected to first group of light-emitting diode G
1a～G
1bTo the 4th group of light-emitting diode G
4a～G
4b
Please refer to Fig. 6, it is the circuit diagram of the flow equalizing circuit of another preferred embodiment of the present invention.As shown in Figure 6, flow equalizing circuit 22 is connected to n group light-emitting diode G
1a～G
Nb, this flow equalizing circuit 22 is made of many groups inductive bank, and for example x group inductive bank 221,222～22x constitute (wherein x is the positive integer greater than 2), and wherein first group of inductive bank 221 comprises first a coupling inductance L with n inductance
C1(this first coupling inductance L
C1The inductance number identical with total group of number of multi-group light-emitting diode), and the inductance number of second group of inductive bank 222 is less than the inductance number (the inductance number-2 of the inductance number=first group inductive bank 221 of this second group of inductive bank 222) of first group of inductive bank 221, and can be made up of a coupling inductance (as shown in Figure 6) or a plurality of coupling inductance (as shown in Figure 7).By that analogy, the inductance number of x group inductive bank 22x is less than the inductance number of one group of (x-1) inductive bank, similarly also can be made up of a coupling inductance or a plurality of coupling inductance.In the embodiment shown in fig. 6, each group inductive bank 221,222～22x are made up of a coupling inductance.Wherein, each inductance of first group of inductive bank 221 can be respectively constitutes a current circuit with corresponding each group light-emitting diode, its current circuit number is that n is identical with total group of number of multi-group light-emitting diode, and each group light-emitting diode and each rectifier of contacting corresponding respectively on each current circuit, except first group of inductive bank 221, each inductance of all the other each group inductive bank 222～22x can be connected in series with the partial inductance in corresponding last one group of inductive bank respectively, its serial connection mode repeats no more in this similar in appearance to embodiment shown in Figure 5.In addition, in certain embodiments, the current-balancing supply circuit 2 of multi-group light-emitting diode of the present invention also comprises a plurality of capacitor C
1To C
n, be connected to first group of light-emitting diode G
1a～G
1bTo n group light-emitting diode G
Na～G
Nb
Please refer to Fig. 8, it is the circuit diagram of an exemplary flow equalizing circuit of the current-balancing supply circuit of the multi-group light-emitting diode of the another preferred embodiment of the present invention.As shown in Figure 8, flow equalizing circuit 22 is connected to n group light-emitting diode G
1a～G
Nb, wherein n is the positive even-integral number more than or equal to 4, and this flow equalizing circuit 22 is made of two groups of inductive bank 221,222, and wherein first group of inductive bank 221 comprises (n/2) individual coupling inductance L
C1, should (n/2) individual coupling inductance L
C1Inductance number summation be n (the total inductance number of first group of inductive bank 221 is identical with total group of number of multi-group light-emitting diode), and the inductance number of second group of inductive bank 222 is less than the inductance number (the inductance number-2 of the inductance number=first group inductive bank 221 of this second group of inductive bank 222) of first group of inductive bank 221, and can be by [(n-2)/2] individual coupling inductance L
C2Form.In this embodiment, total coupling inductance number is (n/2)+[(n-2)/2]=n-1, and in other words, flow equalizing circuit 22 can use n-1 coupling inductance.Similarly, each inductance of first group of inductive bank 221 can be respectively constitutes a current circuit with corresponding each group light-emitting diode, its current circuit number is that n is identical with total group of number of multi-group light-emitting diode, and each group light-emitting diode and each rectifier of contacting corresponding respectively on each current circuit.Each inductance of second group of inductive bank 222 can be connected in series with the partial inductance in corresponding first group of inductive bank 221 respectively, and its serial connection mode repeats no more in this similar in appearance to embodiment shown in Figure 5.In addition, in certain embodiments, the current-balancing supply circuit 2 of multi-group light-emitting diode of the present invention also comprises a plurality of capacitor C
1To C
n, be connected to first group of light-emitting diode G
1a～G
1bTo n group light-emitting diode G
Na～G
Nb
Please refer to Fig. 9, it is the routine circuit diagram of another variation embodiment illustrated in fig. 8.As shown in Figure 9, flow equalizing circuit 22 is connected to n group light-emitting diode G
1a～G
Nb, this flow equalizing circuit 22 is made of three groups of inductive bank 221,222,223, and wherein first group of inductive bank 221 comprises (n/2) individual coupling inductance L
C1, should (n/2) individual coupling inductance L
C1Inductance number summation be n (the total inductance number of first group of inductive bank 221 is identical with total group of number of multi-group light-emitting diode), and the inductance number of second group of inductive bank 222 is less than the inductance number (the inductance number-2 of the inductance number=first group inductive bank 221 of this second group of inductive bank 222) of first group of inductive bank 221, and can be by [(n-2)/2] individual coupling inductance L
C2Form.The inductance number of the 3rd group of inductive bank 223 is less than the inductance number of second group of inductive bank 222, and can be by single coupling inductance L
C3Form.In this embodiment, total coupling inductance number is (n/2)+[(n-2)/2]+1=n, and in other words, flow equalizing circuit 22 can use n coupling inductance.Similarly, each inductance of first group of inductive bank 221 can be respectively constitutes a current circuit with corresponding each group light-emitting diode, its current circuit number is that n is identical with total group of number of multi-group light-emitting diode, and each group light-emitting diode and each rectifier of contacting corresponding respectively on each current circuit.Each inductance of second group of inductive bank 222 can be connected in series with the partial inductance in corresponding first group of inductive bank 221 respectively, and its serial connection mode repeats no more in this similar in appearance to embodiment shown in Figure 8.The 3rd group of inductive bank 223 has two inductance, and is connected in series with first inductance and last inductance of first group of inductive bank 221 respectively.In addition, in certain embodiments, the current-balancing supply circuit 2 of multi-group light-emitting diode of the present invention also comprises a plurality of capacitor C
1To C
n, be connected to first group of light-emitting diode G
1a～G
1bTo n group light-emitting diode G
Na～G
NbUtilize this flow equalizing circuit 22 to make and flow through n group light-emitting diode G
1a～G
NbElectric current do not reach identical in fact only, and safety issue that is caused can avoid short circuit time the and the function that increases protection.
Please refer to Figure 10, it is the circuit diagram of an exemplary flow equalizing circuit of the current-balancing supply circuit of the multi-group light-emitting diode of another preferred embodiment of the present invention.Current-balancing supply circuit 2 with multi-group light-emitting diode of the present invention is applied to drive for example four groups of light-emitting diode G
1a～G
4bBe example, as shown in figure 10, flow equalizing circuit 22 is connected to four groups of light-emitting diode G
1a～G
4b, this flow equalizing circuit 22 is made of first group of inductive bank 221, second group of inductive bank 222 and the 3rd group of inductive bank 223, and wherein first group of inductive bank 221 is by having two inductance L
C11, L
C12The first coupling inductance L
C1Form, and the inductance number of second group of inductive bank 222 is two, equals the inductance number of first group of inductive bank 221 with comparing.In addition, the inductance number of the 3rd group of inductive bank 223 also is two, equals the inductance number of first group of inductive bank 221, second group of inductive bank 222 with comparing.In the present embodiment, second group of inductive bank 222 is by having two inductance L
C21, L
C22The second coupling inductance L
C2Form, the 3rd group of inductive bank 223 is by having two inductance L
C31, L
C32The 3rd coupling inductance L
C3Form.
In this embodiment, first inductance L in first group of inductive bank 221
C11, second inductance L
C12Respectively with first group of light-emitting diode G
1a～G
1bAnd second group of light-emitting diode G
2a～G
2bConstitute first current circuit and second current circuit, wherein first group of light-emitting diode G of serial connection on first current circuit
1a～G
1b, first capacitor C
1And the first rectifier D
1, and second group of light-emitting diode G of serial connection on second current circuit
2a～G
2b, second capacitor C
2And the second rectifier D
2First inductance L in second group of inductive bank 222
C21Then with first inductance L of first group of inductive bank 221
C11Serial connection relatively, and second inductance L in second group of inductive bank 222
C22Then with the 3rd group of light-emitting diode G
3a～G
3bConstitute the 3rd current circuit accordingly, and the 3rd group of light-emitting diode G of serial connection on the 3rd current circuit
3a～G
3b, the 3rd capacitor C
3And the 3rd rectifier D
3In addition, first inductance L in the 3rd group of inductive bank 223
C31Then similarly with first inductance L of first group of inductive bank 221
C11And first inductance L of second group of inductive bank 222
C21Serial connection relatively, and second inductance L in the 3rd group of inductive bank 223
C32Then with the 4th group of light-emitting diode G
4a～G
4bConstitute one the 4th current circuit, and the 4th group of light-emitting diode G of serial connection on the 4th current circuit
4a～G
4b, the 4th capacitor C
4And the 4th rectifier D
4In other words, in this embodiment, can be connected in series first group of light-emitting diode G on first current circuit
1a～G
1b, first inductance L in first group of inductive bank 221
C11, first inductance L in second group of inductive bank 222
C21, first inductance L in the 3rd group of inductive bank 223
C31, first capacitor C
1And the first rectifier D
1
Please refer to Figure 11, it is the circuit diagram of another embodiment of flow equalizing circuit structure shown in Figure 10.The current-balancing supply circuit 2 of multi-group light-emitting diode of the present invention can be applicable to drive multi-group light-emitting diode, and as shown in figure 11, flow equalizing circuit 22 is connected in n group light-emitting diode G
1a～G
Nb, this flow equalizing circuit 22 is made of first group of inductive bank 221, second group of inductive bank 222, the 3rd group of inductive bank 223～the (n-1) group inductive bank 22 (n-1), and wherein first group of inductive bank 221 is by having two inductance L
C11, L
C12The first coupling inductance L
C1Form, and the inductance number of second group of inductive bank 222 is two, equals the inductance number of first group of inductive bank 221 with comparing.In addition, the inductance number of the 3rd group of inductive bank 223 also is two, equals the inductance number of first group of inductive bank 221, second group of inductive bank 222 with comparing.Similarly, the inductance number of (n-1) group inductive bank 22 (n-1) also is two, equals the inductance number out of the ordinary of other group inductive bank with comparing.In the present embodiment, second group of inductive bank 222 is by having two inductance L
C21, L
C22The second coupling inductance L
C2Form, the 3rd group of inductive bank 223 is by having two inductance L
C31, L
C32The 3rd coupling inductance L
C3Form.Similarly, (n-1) group inductive bank 22 (n-1) is by having two inductance L
C (n-1) 1, L
C (n-1) 2(n-1) coupling inductance L
C (n-1)Form.Hence one can see that, and flow equalizing circuit 22 has (n-1) individual coupling inductance altogether.
In this embodiment, first inductance L in first group of inductive bank 221
C11, second inductance L
C12Respectively with first group of light-emitting diode G
1a～G
1bAnd second group of light-emitting diode G
2a～G
2bConstitute first current circuit and second current circuit, wherein first group of light-emitting diode G of serial connection on first current circuit
1a～G
1b, first capacitor C
1And the first rectifier D
1, and second group of light-emitting diode G of serial connection on second current circuit
2a～G
2b, second capacitor C
2And the second rectifier D
2First inductance L in second group of inductive bank 222
C21Then with first inductance L of first group of inductive bank 221
C11Serial connection relatively, and second inductance L in second group of inductive bank 222
C22Then with the 3rd group of light-emitting diode G
3a～G
3bConstitute one the 3rd current circuit accordingly, and the 3rd group of light-emitting diode G of serial connection on the 3rd current circuit
3a～G
3b, the 3rd capacitor C
3And the 3rd rectifier D
3In addition, first inductance L in the 3rd group of inductive bank 223
C31Then similarly with first inductance L of first group of inductive bank 221
C11And first inductance L of second group of inductive bank 222
C21Serial connection relatively, and second inductance L in the 3rd group of inductive bank 223
C32Then with the 4th group of light-emitting diode G
4a～G
4bConstitute one the 4th current circuit, and the 4th group of light-emitting diode G of serial connection on the 4th current circuit
4a～G
4b, the 4th capacitor C
4And the 4th rectifier D
4Similarly, first inductance L in (n-1) the group inductive bank 22 (n-1)
C (n-1) 1Then with first inductance L of first group of inductive bank 221
C11, second group of inductive bank 222 first inductance L
C21, the 3rd group of inductive bank 223 first inductance L
C31First inductance L of～the (n-2) group inductive bank
C (n-2) 1Be connected in series accordingly, and second inductance L in (n-1) the group inductive bank 22 (n-1)
C (n-1) 2Then with n group light-emitting diode G
Na～G
NbConstitute the n current circuit accordingly, and serial connection n group light-emitting diode G on the n current circuit
Na～G
Nb, the n capacitor C
nAnd n rectifier D
nIn other words, in this embodiment, can be connected in series first group of light-emitting diode G on first current circuit
1a～G
1b, first group of inductive bank 221 first inductance L
C11, second group of inductive bank 222 first inductance L
C21, the 3rd group of inductive bank 223 first inductance L
C31First inductance L of～the (n-1) group inductive bank
C (n-1) 1, first capacitor C
1And the first rectifier D
1Utilize this flow equalizing circuit 22 to make and flow through n group light-emitting diode G
1a～G
NbElectric current reach identical in fact, make n group light-emitting diode G
1a～G
NbLuminosity identical in fact.
In sum, the current-balancing supply circuit utilization of multi-set DC laden of the present invention is different from traditional multi-set DC laden power supply circuits, make the current balance type and the luminosity of each group DC load identical, more make the little and circuit operational efficiency height of circuit power loss, use less elements and circuit complexity low relatively, and can reduce cost significantly.
The prerequisite that does not break away from spirit of the present invention of replacement or modification field of the present invention is done under to(for) those skilled in the art all do not break away from the claim protection range of the present invention.
Claims (19)
1. the current-balancing supply circuit of a multi-set DC laden, in order to drive multi-set DC laden, the current-balancing supply circuit of this multi-set DC laden comprises at least:
Current suppling circuit is in order to receive power supply and to be converted to the electric current of specific currents size, to offer this multi-set DC laden;
Flow equalizing circuit, be connected in series with output and this multi-set DC laden of this current suppling circuit, size of current in order to this multi-set DC laden of balance, and this flow equalizing circuit comprises many group inductive bank, each group inductive bank comprises at least one coupling inductance, each coupling inductance comprises a plurality of inductance, and at least one inductance of this coupling inductance of each group inductive bank that wherein should many group inductive bank is serial connection mutually each other, and with this multi-set DC laden wherein one group be connected in series accordingly; And
Current control unit is connected in this current suppling circuit and this multi-set DC laden at least one group, in order to size of current that detects this multi-set DC laden and the output current of controlling this current suppling circuit.
2. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1 also comprises a plurality of rectifiers, is connected in series with output, this flow equalizing circuit and this multi-set DC laden of this current suppling circuit respectively.
3. the current-balancing supply circuit of multi-set DC laden as claimed in claim 2, wherein these a plurality of rectifiers are serially connected with respectively between the output and this flow equalizing circuit of this current suppling circuit, or are serially connected with respectively between this flow equalizing circuit and this multi-set DC laden.
4. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1 also comprises power rectifier circuit, is connected in the input of this current suppling circuit, in order to receive AC power and to be converted to this power supply to this current suppling circuit.
5. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1 also comprises filter circuit, is connected in the input of this current suppling circuit.
6. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1 also comprises a plurality of electric capacity, is connected to this multi-set DC laden.
7. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1, wherein this current suppling circuit comprises at least:
Switching circuit comprises at least one switch element, is connected in the input of this current control unit and this current suppling circuit; And
Transformer comprises elementary coiling and organizes secondary rolling thread more, and this elementary coiling is connected in the input of this switching circuit and this current suppling circuit.
8. the current-balancing supply circuit of multi-set DC laden as claimed in claim 7, wherein this switching circuit is formed by first switch element, this current control unit is controlled this first switch element conducting or is ended, with this power supply be sent to this transformer should many group secondary rolling threads, and wherein this transformer should many group secondary rolling threads each group secondary rolling threads identical with the turn ratio of this elementary coiling.
9. the current-balancing supply circuit of multi-set DC laden as claimed in claim 7, wherein this switching circuit comprises second switch element, the 3rd switch element, resonant inductance and resonant capacitance, wherein this second switch element and the 3rd switch element are connected with this input of this current control unit, this current suppling circuit respectively and in a string contact serial connection, and should the serial connection point with this elementary coiling of this transformer between be connected in series this resonant inductance and this resonant capacitance.
10. the current-balancing supply circuit of multi-set DC laden as claimed in claim 9, wherein this current control unit is controlled this second switch element and the mutual conducting of the 3rd switch element or is ended, should many group secondary rolling threads with what this power supply is sent to this transformer, and wherein this transformer should many group secondary rolling threads each groups have centre cap respectively and be connected in contact altogether.
11. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1, wherein this flow equalizing circuit comprises many group inductive bank, and each group inductive bank comprises a coupling inductance, and each coupling inductance comprises two inductance.
12. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1, all the other inductance that wherein are somebody's turn to do this coupling inductance of each group inductive bank of organizing inductive bank are connected in series with all the other group DC load of this multi-set DC laden respectively accordingly.
13. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1, wherein this multi-set DC laden is a multi-group light-emitting diode, and the current-balancing supply circuit of this multi-set DC laden is the current-balancing supply circuit of multi-group light-emitting diode.
14. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1, wherein each group DC load of this multi-set DC laden has a plurality of DC load respectively.
15. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1, wherein this output current of this current suppling circuit is the pulsed electric current.
16. flow equalizing circuit, be used for current-balancing supply circuit, this current-balancing supply circuit and current suppling circuit is arranged wherein, the electric current that is used to the specific currents size is provided is to multi-set DC laden, the output of this flow equalizing circuit and this current suppling circuit and this multi-set DC laden is connected in series and this flow equalizing circuit comprises at least:
At least one group of inductive bank, each group inductive bank has at least one coupling inductance, and each coupling inductance has a plurality of inductance, offers the size of current of this multi-set DC laden in order to balance.
17. flow equalizing circuit as claimed in claim 16, wherein this flow equalizing circuit comprises many group inductive bank, and each group inductive bank comprises a coupling inductance, and each coupling inductance comprises two inductance.
18. flow equalizing circuit as claimed in claim 17, at least one inductance of this coupling inductance of each group inductive bank that wherein should many group inductive bank be serial connection mutually each other, and with this multi-set DC laden wherein one group be connected in series accordingly.
19. flow equalizing circuit as claimed in claim 18, all the other inductance that wherein are somebody's turn to do this coupling inductance of each group inductive bank of organizing inductive bank are connected in series with all the other group DC load of this multi-set DC laden respectively accordingly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101282438A CN101510723B (en) | 2008-02-14 | 2008-07-04 | Multi-set DC laden current balance power supply circuit |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810005643.X | 2008-02-14 | ||
| CN200810005643 | 2008-02-14 | ||
| CN2008101282438A CN101510723B (en) | 2008-02-14 | 2008-07-04 | Multi-set DC laden current balance power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101510723A CN101510723A (en) | 2009-08-19 |
| CN101510723B true CN101510723B (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100852275A Active CN101511136B (en) | 2008-02-14 | 2008-03-10 | Current balance power supply circuit of multi-group light-emitting diode |
| CN2008101282438A Active CN101510723B (en) | 2008-02-14 | 2008-07-04 | Multi-set DC laden current balance power supply circuit |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100852275A Active CN101511136B (en) | 2008-02-14 | 2008-03-10 | Current balance power supply circuit of multi-group light-emitting diode |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101511136B (en) | 2013-02-20 |
| CN101510723A (en) | 2009-08-19 |
| CN101511136A (en) | 2009-08-19 |
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