CN101873739A - Current-balancing supply circuit with multiple groups of DC loads - Google Patents

Current-balancing supply circuit with multiple groups of DC loads Download PDF

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Publication number
CN101873739A
CN101873739A CN200910139229A CN200910139229A CN101873739A CN 101873739 A CN101873739 A CN 101873739A CN 200910139229 A CN200910139229 A CN 200910139229A CN 200910139229 A CN200910139229 A CN 200910139229A CN 101873739 A CN101873739 A CN 101873739A
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current
circuit
group
switch
laden
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CN101873739B (en
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张世贤
柯柏年
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Delta Optoelectronics Inc
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Delta Optoelectronics Inc
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Abstract

The invention discloses a current-balancing supply circuit with multiple groups of DC loads, which is used for driving a first group of DC loads and a second group of DC loads and at least comprises a current supply circuit, a current stabilizing circuit, a first output rectifying circuit and a second output rectifying circuit, wherein the current supply circuit is used for receiving the energy of an input voltage so as to produce a first current or a first voltage; the current stabilizing circuit is connected with the power output end of the current supply circuit and at least comprises a first current stabilizing transformer and a second current stabilizing transformer; the first output rectifying circuit is connected between the first group of DC loads and the first output end of the current stabilizing circuit and is used for rectifying and producing a first output current for the first group of DC loads; and the second output rectifying circuit is connected between the second group of DC loads and the second output end of the current stabilizing circuit and is used for rectifying and producing a second output current for the second group of DC loads. The invention ensures that the currents of all groups of DC loads are balanced and have the same luminance; and compared with the traditional circuit, the current-balancing supply circuit not only is simpler and has lower circuit complexity, but also has lower power consumption and higher circuit operating efficiency.

Description

The current-balancing supply circuit of multi-set DC laden
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 signals 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 defective.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 Iref that the first input end of linear voltage adjuster 11 connects produces corresponding output voltage to low pass filter 12, via outputing to current mirror M again after low pass filter 12 filtering for deciding electric current 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 paradigm is low, uses more element and circuit complicated relatively.Therefore, how to develop a kind of current-balancing supply circuit that improves above-mentioned prior art defective, real problem for those of ordinary skills' 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 architecture of traditional multi-set DC laden power supply circuits, make the current balance type and the luminosity of each group DC load identical, also make the little and circuit operational paradigm height of circuit power loss, use less elements and circuit complexity low relatively, and can save significantly cost.In addition, the current-balancing supply circuit of multi-set DC laden has smaller volume and higher current densities, and can be applied to need the electronic product of less element heights, for example use light-emitting diode to be the slim TV of backlight, slim screen or slim notebook computer.
For reaching above-mentioned purpose, of the present invention one than the broad sense embodiment for a kind of current-balancing supply circuit of multi-set DC laden is provided, in order to drive first group of DC load and second group of DC load, the current-balancing supply circuit of this multi-set DC laden comprises at least: current suppling circuit, produce first electric current or first voltage in order to the energy that receives input voltage, so that electric energy to the first group DC load and second group of DC load to be provided; Flow equalizing circuit is connected with the power output end of current suppling circuit, and flow equalizing circuit comprises first current-sharing transformer and second current-sharing transformer at least; First output rectification circuit is connected between first output of first group of DC load and flow equalizing circuit, in order to rectification and produce first and output current to first group of DC load; And second output rectification circuit, be connected between second output of second group of DC load and flow equalizing circuit, in order to rectification and produce second and output current to second group of DC load; Wherein, the current-balancing supply circuit of multi-set DC laden utilizes flow equalizing circuit balance first output current and second output current.
For reaching above-mentioned purpose, of the present invention another than the broad sense embodiment for a kind of current-balancing supply circuit of multi-set DC laden is provided, in order to drive multi-set DC laden, the current-balancing supply circuit of multi-set DC laden comprises at least: current suppling circuit, produce first electric current or first voltage in order to the energy that receives input voltage, organize DC load at the most so that electric energy to be provided; Flow equalizing circuit is connected with the power output end of current suppling circuit, and flow equalizing circuit comprises the many group current-sharing transformer groups and at least the first coupling inductance, and each group of organizing in the current-sharing transformer group is made up of one deck at least more; And a plurality of output rectification circuits, in a plurality of output rectification circuits each is corresponding separately to be connected between one group of DC load of output of this flow equalizing circuit and multi-set DC laden, in order to rectification respectively and produce a plurality of multi-set DC ladens that output current to respectively; Wherein, the current-balancing supply circuit of multi-set DC laden utilizes a plurality of output currents of flow equalizing circuit balance.
For reaching above-mentioned purpose, of the present invention another than the broad sense embodiment for a kind of current-balancing supply circuit of multi-set DC laden is provided, 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, produce first electric current or first voltage in order to the energy that receives input voltage, organize DC load at the most so that electric energy to be provided; Flow equalizing circuit is connected with the power output end of current suppling circuit, and flow equalizing circuit comprises first group of current-sharing transformer group, and first group of current-sharing transformer group is made up of one deck at least; And a plurality of output rectification circuits, in a plurality of output rectification circuits each is corresponding separately to be connected between one group of DC load of output of flow equalizing circuit and multi-set DC laden, in order to rectification respectively and produce a plurality of multi-set DC ladens that output current to respectively; Wherein, the current-balancing supply circuit of multi-set DC laden utilizes a plurality of output currents of flow equalizing circuit balance.
The present invention makes the current balance type and the luminosity of each group DC load identical, and not only simple and circuit complexity is low than traditional circuit, power loss can also less and circuit operational paradigm height.
Description of drawings
Fig. 1 is traditional current-balancing supply circuit.
Fig. 2 is the circuit block diagram of the current-balancing supply circuit of the multi-set DC laden of preferred embodiment of the present invention.
Fig. 3 is the thin portion circuit diagram of the current-balancing supply circuit of the multi-set DC laden of preferred embodiment of the present invention.
Fig. 4 is the thin portion circuit diagram of the current-balancing supply circuit of the multi-set DC laden of another preferred embodiment of the present invention.
Fig. 5 is the thin portion circuit diagram of the current-balancing supply circuit of the multi-set DC laden of another preferred embodiment of the present invention.
Fig. 6 is the thin portion circuit diagram of the current-balancing supply circuit of the multi-set DC laden of another preferred embodiment of the present invention.
Fig. 7 is the thin portion circuit diagram of the current-balancing supply circuit of the multi-set DC laden of another preferred embodiment of the present invention.
Fig. 8 is the thin portion circuit diagram of the current-balancing supply circuit of the multi-set DC laden of another preferred embodiment of the present invention.
Fig. 9 is the thin portion circuit diagram of the current-balancing supply circuit of the multi-set DC laden of another preferred embodiment of the present invention.
Figure 10 is the thin portion circuit diagram of the flow equalizing circuit of another preferred embodiment of the present invention.
Figure 11 is the thin portion circuit diagram of the flow equalizing circuit of another preferred embodiment of the present invention.
And the description of reference numerals in the above-mentioned accompanying drawing is as follows:
11: linear voltage adjuster 12: low pass filter
M 1～M n: a plurality of current mirror I Ref: reference current
2: the current-balancing supply circuit of multi-set DC laden
21: current suppling circuit 211: commutation circuit
212: control circuit 213: resonant circuit
22: flow equalizing circuit 22a: first output
22b: 221: the first groups of current-sharing transformations of second output group
223: the three groups of current-sharing transformation groups of 222: the second groups of current-sharing transformation groups
The second equal flow branching that 2211: the first groups the first equal flow branching is 2212: the first groups
The second equal flow branching that 2221: the first groups the first equal flow branching is 2222: the first groups
231～238: first～the 8th output rectification circuit
24: rectification circuit
G 1～G 8: the first～eight group of light-emitting diode
Q 1～Q 4: first～the 4th switch Q 1a～Q 4a: first end
Q 1b～Q 4b: the second end B 1: bus
C Bus: bus capacitance C r: resonant capacitance
L r: resonant inductance L C1～L C3: first～the 3rd coupling inductance
L C11: first inductance L C12: second inductance
L C21: the 3rd inductance L C22: the 4th inductance
L C31: the 5th inductance L C32: the 6th inductance
T r: isolating transformer N Rp: primary coil
N Rs: secondary coil T a: first current-sharing transformer
T b: the second current-sharing transformer N Ap, N Bp: primary coil
N As, N Bs: secondary coil
T A1～T A6: first group first～the 6th current-sharing transformer
T B1～T B6: second group first～the 6th current-sharing transformer
T C1～T C2: the 3rd group the first～the second current-sharing transformer
N A1p～N A6p: primary coil N B1p～N B6p: primary coil
N A1s～N A6s: secondary coil N B1s～N B6s: secondary coil
N C1p～N C2p: primary coil N C1s～N C2s: secondary coil
D A1: the first main diode D A2: diode for the first time
D B1: the second main diode D B2: diode for the second time
COM1: first meets end COM2 altogether: second connects end altogether
V In: input voltage V Bus: bus voltage
V 1: the first voltage I 1: first electric current
I O1～I O8: first～the 8th output current
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 on different schemes, its neither departing 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 three light-emitting diodes.Below the DC load that will have three light-emitting diodes separately with two groups of light-emitting diodes is that example illustrates the technology of the present invention.
See also Fig. 2, it is the circuit block diagram of the current-balancing supply circuit of the multi-set DC laden of preferred embodiment of the present invention.As shown in Figure 2, the current-balancing supply circuit 2 of multi-set DC laden is in order to drive first group of light-emitting diode G 1With second group of light-emitting diode G 2The current-balancing supply circuit 2 of this multi-set DC laden comprises current suppling circuit 21, flow equalizing circuit 22, first output rectification circuit 231 and second output rectification circuit 232 at least, wherein the power output end of current suppling circuit 21 is connected in the input of flow equalizing circuit 22, in order to receive galvanic input voltage V InEnergy and produce first electric current I 1Or the first voltage V 1, so that electric energy to the first group light-emitting diode G to be provided 1With second group of light-emitting diode G 2
Flow equalizing circuit 22 comprises the first current-sharing transformer T at least aWith the second current-sharing transformer T b(not shown), and the input of flow equalizing circuit 22 is connected with the power output end of current suppling circuit 21, in order to receive first electric current I 1Or the first voltage V 1Electric energy and the equilibratory separately first output current I O1With the second output current I O2To first group of light-emitting diode G 1With second group of light-emitting diode G 2The input of first output rectification circuit 231 is connected with the first output 22a of flow equalizing circuit 22, and the output of first output rectification circuit 231 is connected in first group of light-emitting diode G 1An end, in order to rectification and produce the first output current I O1To this first group of light-emitting diode G 1The input of second output rectification circuit 232 is connected with the second output 22b of flow equalizing circuit 22, and the output of second output rectification circuit 232 is connected in second group of light-emitting diode G 2An end, in order to rectification and produce the second output current I O2To this second group of light-emitting diode G 2
See also Fig. 3 and cooperate Fig. 2, Fig. 3 is the thin portion circuit diagram of the current-balancing supply circuit of the multi-set DC laden of preferred embodiment of the present invention.As shown in Figure 3, current suppling circuit 21 comprises commutation circuit 211 (switching circuit), control circuit 212 and isolating transformer T r, wherein the power output end of commutation circuit 211 is connected in isolating transformer T rPrimary coil N Rp(primary winding), the control end of commutation circuit 211 is connected in control circuit 212, in order to the first pulse width modulation signal V that produces according to control circuit 212 PWM1With the second pulse width modulation signal V PWM2, make input voltage V InEnergy selectivity ground be sent to isolating transformer T via commutation circuit 211 rPrimary coil N Rp
In present embodiment, commutation circuit 211 comprises the first switch Q 1With second switch Q 2, the first switch Q 1The first end Q 1aBe connected in isolating transformer T rPrimary coil N RpAn end and second switch Q 2The second end Q 2b, second switch Q 2The first end Q 2aWith isolating transformer T rPrimary coil N RpThe other end be connected in first connect altogether the end COM1, the first switch Q 1With second switch Q 2Control end be connected in control circuit 212 separately, and the first pulse width modulation signal V that produces by control circuit 212 PWM1With the second pulse width modulation signal V PWM2Control the first switch Q respectively 1With second switch Q 2Conducting or end makes input voltage V InEnergy selectivity ground via the first switch Q 1The second end Q 1bOr second switch Q 2The first end Q 2aBe sent to isolating transformer T rPrimary coil N Rp, and then make isolating transformer T rPrimary coil N RpTwo ends produce change in voltage, and isolating transformer T rSecondary coil N Rs(secondary winding) can be according to isolating transformer T rPrimary coil N RpThe change in voltage induction at two ends produces first electric current I 1Or the first voltage V 1
In present embodiment, flow equalizing circuit 22 is by the first current-sharing transformer T aWith the second current-sharing transformer T bConstitute, first output rectification circuit 231 is by the first main diode D A1With the diode D first time A2Constitute, and second output rectification circuit 232 is by the second main diode D B1With the diode D second time B2Constitute.Wherein, the first current-sharing transformer T aPrimary coil N ApWith the second current-sharing transformer T bPrimary coil N BpPower output end at current suppling circuit 21 is connected in series, the first current-sharing transformer T aSecondary coil N AsTwo ends be connected to the first main diode D A1With the diode D first time A2Anode tap (anode), the first main diode D A1With the diode D first time A2Cathode terminal (cathode) be connected in first group of light-emitting diode G 1Anode tap, and first group of light-emitting diode G 1The cathode terminal and the first current-sharing transformer T aSecondary coil N AsCentre cap (center-tapped) be connected in second connect altogether the end COM2.Similarly, the second current-sharing transformer T bSecondary coil N BsTwo ends be connected to the second main diode D B1With the diode D second time B2Anode tap, the second main diode D B1With the diode D second time B2Cathode terminal be connected in second group of light-emitting diode G 2Anode tap, and second group of light-emitting diode G 2The cathode terminal and the second current-sharing transformer T bSecondary coil N BsCentre cap be connected in second connect altogether the end COM2.
Because, the first current-sharing transformer T aPrimary coil N ApWith the second current-sharing transformer T bPrimary coil N BpBe connected in series in the power output end of current suppling circuit 21, so the first current-sharing transformer T flows through aPrimary coil N ApWith the second current-sharing transformer T bPrimary coil N BpFirst electric current I of current value for equating 1, make the current-sharing transformer T that wins aSecondary coil N AsWith the second current-sharing transformer T bSecondary coil N BsEach self-induction first current-sharing transformer T aPrimary coil N ApWith the second current-sharing transformer T bPrimary coil N BpElectric energy and the first output current I that produces separately O1With the second output current I O2To first group of light-emitting diode G 1With second group of light-emitting diode G 2Also can equate.
See also Fig. 4 and cooperate Fig. 3, Fig. 4 is the thin portion circuit diagram of the current-balancing supply circuit of the multi-set DC laden of another preferred embodiment of the present invention.Fig. 4 and Fig. 3 difference are that the current suppling circuit 21 of Fig. 4 also comprises resonant circuit 213, and are connected in the power output end and the isolating transformer T of commutation circuit 211 rPrimary coil N RpBetween, in present embodiment, resonant circuit 213 is resonant capacitance C r, and resonant capacitance C rBe connected in series in the power output end and the isolating transformer T of commutation circuit 211 rPrimary coil N RpBetween, resonant capacitance C rWith isolating transformer T rPrimary coil N RpCan constitute the resonance relation, make isolating transformer T rPrimary coil N RpThe magnitude of voltage at two ends produces change in voltage.In the same manner, isolating transformer T rSecondary coil N RsAlso can be according to isolating transformer T rPrimary coil N RpThe change in voltage induction at two ends produces first electric current I 1Or the first voltage V 1
See also Fig. 5 and cooperate Fig. 4, Fig. 5 is the thin portion circuit diagram of the current-balancing supply circuit of the multi-set DC laden of another preferred embodiment of the present invention.Fig. 5 and Fig. 4 difference are that the resonant circuit 213 of Fig. 5 also comprises resonant inductance L r, and resonant inductance L rWith resonant capacitance C rBe connected in series in the power output end and the isolating transformer T of commutation circuit 211 rPrimary coil N RpBetween, resonant inductance L r, resonant capacitance C rAnd isolating transformer T rPrimary coil N RpEqually can constitute the resonance relation, make isolating transformer T rPrimary coil N RpThe magnitude of voltage at two ends produces change in voltage.In the same manner, isolating transformer T rSecondary coil N RsAlso can be according to isolating transformer T rPrimary coil N RpThe change in voltage induction at two ends produces first electric current I 1Or the first voltage V 1
Because, isolating transformer T in the present embodiment rPrimary coil N RpOnly form the resonance relation, in the design first current-sharing transformer T with resonant circuit 213 a, the second current-sharing transformer T bAnd isolating transformer T rThe time, only need make isolating transformer T rForm the resonance relation of desiring to reach with resonant circuit 213 and get final product, for example resonance frequency is 30k Hz, and the first current-sharing transformer T aWith the second current-sharing transformer T bNeed not be subjected to resonant circuit 213 and isolating transformer T rNeed to form the restriction of resonance relation.Therefore, the first current-sharing transformer T aWith the second current-sharing transformer T bExcept selecting better simply transformer device structure for use, also can the corresponding first output current I O1With the second output current I O2Size of current design the first current-sharing transformer T more easily aWith the second current-sharing transformer T b, make the first output current I O1With the second output current I O2Electric current identical.In addition, the current-balancing supply circuit 2 of multi-set DC laden is to utilize isolating transformer T in the present embodiment rReach isolating function, but not utilize the first current-sharing transformer T aWith the second current-sharing transformer T bReach isolating function, therefore, the first current-sharing transformer T aWith the second current-sharing transformer T bIt is less and do not have a transformer of buffer action to can be designed as volume, and then the current-balancing supply circuit 2 that makes multi-set DC laden of the present invention has smaller volume and higher current densities, need can also be applied to the electronic product of less element heights, for example use light-emitting diode to be the slim TV of backlight, slim screen or slim notebook computer.
See also Fig. 6 and cooperate Fig. 3, Fig. 6 is the thin portion circuit diagram of the current-balancing supply circuit of the multi-set DC laden of another preferred embodiment of the present invention.Fig. 6 and Fig. 3 difference are that the commutation circuit 211 of Fig. 6 also comprises the 3rd switch Q 3With the 4th switch Q 4, isolating transformer T rPrimary coil N RpAn end be connected in the first switch Q equally 1The first end Q 1aWith second switch Q 2The second end Q 2b, and isolating transformer T rPrimary coil N RpThe other end then be connected in the 3rd switch Q 3The first end Q 3aWith the 4th switch Q 4The second end Q 4b
Wherein, the 4th switch Q 4The first end Q 4aBe connected in first and meet end COM1, the 3rd switch Q altogether 3The second end Q 3bWith the first switch Q 1The second end Q 1bConnect the 3rd switch Q 3With the 4th switch Q 4Control end be connected in control circuit 212 separately, and control circuit 212 is by the first pulse width modulation signal V that produces PWM1, the second pulse width modulation signal V PWM2, the 3rd pulse width modulation signal V PWM3And the 4th pulse width modulation signal V PWM4Control the first switch Q respectively 1, second switch Q 2, the 3rd switch Q 3And the 4th switch Q 4Conducting or end makes input voltage V InEnergy selectivity ground via the first switch Q 1, second switch Q 2, the 3rd switch Q 3Or the 4th switch Q 4Be sent to isolating transformer T rPrimary coil N Rp, and then make isolating transformer T rPrimary coil N RpTwo ends produce change in voltage, and isolating transformer T rSecondary coil N RsEqually can be according to isolating transformer T rPrimary coil N RpThe change in voltage induction at two ends produces first electric current I 1Or the first voltage V 1
See also Fig. 7 and cooperate Fig. 6, Fig. 7 is the thin portion circuit diagram of the current-balancing supply circuit of the multi-set DC laden of another preferred embodiment of the present invention.Fig. 7 and Fig. 6 difference are that the current suppling circuit 21 of Fig. 7 also comprises resonant circuit 213, and are connected in the power output end and the isolating transformer T of commutation circuit 211 rPrimary coil N RpBetween, resonant circuit 213 is resonant capacitance C in present embodiment r, resonant capacitance C rAn end be connected in the first switch Q 1The first end Q 1aWith second switch Q 2The second end Q 2b, resonant capacitance C rThe other end and isolating transformer T rPrimary coil N RpConnect, i.e. resonant capacitance C rBe connected in series in the power output end and the isolating transformer T of commutation circuit 211 rPrimary coil N RpBetween.Resonant capacitance C rWith isolating transformer T rPrimary coil N RpCan constitute the resonance relation, make isolating transformer T rPrimary coil N RpThe magnitude of voltage at two ends produces change in voltage.In the same manner, isolating transformer T rSecondary coil N RsAlso can be according to isolating transformer T rPrimary coil N RpThe change in voltage induction at two ends produces first electric current I 1Or the first voltage V 1
See also Fig. 8 and cooperate Fig. 3, Fig. 8 is the thin portion circuit diagram of the current-balancing supply circuit of the multi-set DC laden of another preferred embodiment of the present invention.Fig. 8 and Fig. 3 difference are that the current-balancing supply circuit 2 of the multi-set DC laden of Fig. 8 also comprises rectification circuit 24 and bus capacitance C Bus, the output of rectification circuit 24 is by bus B 1Be connected in bus capacitance C BusAn end and the power input of current suppling circuit 21, in order to input voltage V with alternating current InRectification and produce bus voltage V Bus, provide again to the power input of current suppling circuit 21.And bus capacitance C BusThe other end then be connected in first connect altogether the end COM1, in order to filtering and storage of electrical energy.
See also Fig. 9 and cooperate Fig. 3, Fig. 9 is the thin portion circuit diagram of the current-balancing supply circuit of the multi-set DC laden of another preferred embodiment of the present invention.Fig. 9 and Fig. 3 difference are that the flow equalizing circuit 22 of Fig. 9 also comprises the first coupling inductance L with a plurality of inductance C1(coupling inductor), and the first current-sharing transformer T aPrimary coil N ApWith the second current-sharing transformer T bPrimary coil N BpThe annexation difference.In present embodiment, the first coupling inductance L C1For common mode inductance (Common inductor) and have first inductance L C11(first inductance coil) and second inductance L C12(second inductance coil), the wherein first coupling inductance L C1First inductance L C11Be connected in series in the first current-sharing transformer T aPrimary coil N Ap, and first inductance L that is connected in series C11With the first current-sharing transformer T aPrimary coil N ApBe connected in parallel in the power output end of current suppling circuit 21.Similarly, second inductance L C12Be connected in series in the second current-sharing transformer T bPrimary coil N Bp, and second inductance L that is connected in series C12With the second current-sharing transformer T bPrimary coil N BpBe connected in parallel in the power output end of current suppling circuit 21.
Because, first inductance L C11And second inductance L C12Intercouple, therefore first inductance L C11And second inductance L C12Current value equal in fact, make the first current-sharing transformer T relatively aPrimary coil N ApWith the second current-sharing transformer T bPrimary coil N BpCurrent value equal in fact.Though, the first current-sharing transformer T aPrimary coil N ApWith the second current-sharing transformer T bPrimary coil N BpBetween for non-being connected in series relation, but utilization is connected in series in first inductance L separately C11And second inductance L C12, also can make the first current-sharing transformer T aPrimary coil N ApWith the second current-sharing transformer T bPrimary coil N BpCurrent value equal in fact.So, the first current-sharing transformer T aSecondary coil N AsWith the second current-sharing transformer T bSecondary coil N BsEach self-induction first current-sharing transformer T aPrimary coil N ApWith the second current-sharing transformer T bPrimary coil N BpElectric energy and the first output current I that produces separately O1With the second output current I O2To first group of light-emitting diode G 1With second group of light-emitting diode G 2Also can equate.
See also Figure 10, it is the thin portion circuit diagram of the flow equalizing circuit of another preferred embodiment of the present invention.Shown in Figure 10, flow equalizing circuit 22 comprises many group current-sharing transformer groups and at least one coupling inductance, be connected by multilayer and form and organize each group in the current-sharing transformer group more, in present embodiment, flow equalizing circuit 22 comprises first group of current-sharing transformer group 221, second group of current-sharing transformer group 222 and the first coupling inductance L with a plurality of inductance C1, the first coupling inductance L wherein C1Comprise first inductance L C11And second inductance L C12, and first group of current-sharing transformer group 221 and second group of current-sharing transformer group 222 have for example two-layer separately.
The ground floor of first group of current-sharing transformer group 221 comprises the first current-sharing transformer T A1With the second current-sharing transformer T A2, and the first current-sharing transformer T A1Primary coil N A1p, the second current-sharing transformer T A2Primary coil N A2pWith the first coupling inductance L C1First inductance L C11Power output end (not shown) at current suppling circuit 21 is connected in series.The first current-sharing transformer T A1Secondary coil N A1sBe connected in the first equal flow branching 2211, and the second current-sharing transformer T A2Secondary coil N A2sBe connected in the second equal flow branching 2212.
The second layer of first group of current-sharing transformer group 221 comprises the first equal flow branching 2211 and second equal flow branching 2212, the first equal flow branchings 2211 comprise the 3rd current-sharing transformer T A3With the 4th current-sharing transformer T A4, the 3rd current-sharing transformer T A3Primary coil N A3pWith the 4th current-sharing transformer T A4Primary coil N A4pThe first current-sharing transformer T at last layer A1Secondary coil N A1sBe connected in series.The second equal flow branching 2212 comprises the 5th current-sharing transformer T A5With the 6th current-sharing transformer T A6, the 5th current-sharing transformer T A5Primary coil N A5pWith the 6th current-sharing transformer T A6Primary coil N A6pThe second current-sharing transformer T at last layer A2Secondary coil N A2sBe connected in series.
The 3rd current-sharing transformer T in last one deck of first group of current-sharing transformer group 221 (being the second layer) A3Secondary coil N A3s, the 4th current-sharing transformer T A4Secondary coil N A4s, the 5th current-sharing transformer T A5Secondary coil N A5sAnd the 6th current-sharing transformer T A6Secondary coil N A6sBe connected to first output rectification circuit 231, second output rectification circuit 232, the 3rd output rectification circuit 233 and the 4th output rectification circuit 234.
Similarly, the ground floor of second group of current-sharing transformer group 222 comprises the first current-sharing transformer T B1With the second current-sharing transformer T B2, and the first current-sharing transformer T B1Primary coil N B1p, the second current-sharing transformer T B2Primary coil N B2pWith the first coupling inductance L C1Second inductance L C12Power output end (not shown) at current suppling circuit 21 is connected in series.The first current-sharing transformer T B1Secondary coil N B1sBe connected in the first equal flow branching 2221, and the second current-sharing transformer T B2Secondary coil N B2sBe connected in the second equal flow branching 2222.
The second layer of second group of current-sharing transformer group 222 comprises the first equal flow branching 2221 and second equal flow branching 2222, the first equal flow branchings 2221 comprise the 3rd current-sharing transformer T B3With the 4th current-sharing transformer T B4, the 3rd current-sharing transformer T B3Primary coil N B3pWith the 4th current-sharing transformer T B4Primary coil N B4pThe first current-sharing transformer T at last layer B1Secondary coil N B1sBe connected in series.The second equal flow branching 2222 comprises the 5th current-sharing transformer T B5With the 6th current-sharing transformer T B6, the 5th current-sharing transformer T B5Primary coil N B5pWith the 6th current-sharing transformer T B6Primary coil N B6pThe second current-sharing transformer T at last layer B2Secondary coil N B2sBe connected in series.
The 3rd current-sharing transformer T in last one deck of second group of current-sharing transformer group 222 (being the second layer) B3Secondary coil N B3s, the 4th current-sharing transformer T B4Secondary coil N B4s, the 5th current-sharing transformer T B5Secondary coil N B5sAnd the 6th current-sharing transformer T B6Secondary coil N B6sBe connected to the 5th output rectification circuit 235, the 6th output rectification circuit 236, the 7th output rectification circuit 237 and the 8th output rectification circuit 238.
With above-mentioned operation principles, first group of current-sharing transformer group 221 and second group of current-sharing transformer group 222 are utilized the first coupling inductance L C1Make the first current-sharing transformer T of the ground floor of first group of current-sharing transformer group 221 A1Primary coil N A1p, first group of current-sharing transformer group 221 the second current-sharing transformer T of ground floor A2Primary coil N A2p, second group of current-sharing transformer group 222 the first current-sharing transformer T of ground floor B1Primary coil N B1pAnd the second current-sharing transformer T of the ground floor of second group of current-sharing transformer group 222 B2Primary coil N B2pCurrent value identical in fact, correspondence makes the first current-sharing transformer T of the ground floor of first group of current-sharing transformer group 221 A1Secondary coil N A1s, first group of current-sharing transformer group 221 the second current-sharing transformer T of ground floor A2Secondary coil N A2s, second group of current-sharing transformer group 222 the first current-sharing transformer T of ground floor B1Secondary coil N B1sAnd the second current-sharing transformer T of the ground floor of second group of current-sharing transformer group 222 B2Primary coil N B2sThe current value of the second equal flow branching 2222 that exports the first equal flow branching 2221 of the second equal flow branching 2212 of the first equal flow branching 2211 of first group of current-sharing transformer group 221, first group of current-sharing transformer group 221, second group of current-sharing transformer group 222 and second group of current-sharing transformer group 222 respectively to is identical in fact.
As for, the 3rd current-sharing transformer T that the first equal flow branching 2211 of first group of current-sharing transformer group 221 utilizes first group of current-sharing transformer group 221 A3Primary coil N A3pWith the 4th current-sharing transformer T A4Primary coil N A4pBe connected in series, make to be sent to first group of light-emitting diode G 1With second group of light-emitting diode G 2The first output current I O1With the second output current I O2Identical in fact.The second equal flow branching 2212 of first group of current-sharing transformer group 221 utilizes the 5th current-sharing transformer T A5Primary coil N A5pWith the 6th current-sharing transformer T A6Primary coil N A6pBe connected in series, make to be sent to the 3rd group of light-emitting diode G 3With the 4th group of light-emitting diode G 4The 3rd output current I O3With the 4th output current I O4Identical in fact.
Similarly, first of second group of current-sharing transformer group 222 equal flow branching 2221 utilizations are with the 3rd current-sharing transformer T of second group of current-sharing transformer group 222 B3Primary coil N B3pWith the 4th current-sharing transformer T B4Primary coil N B4pBe connected in series, make to be sent to the 5th group of light-emitting diode G 5With the 6th group of light-emitting diode G 6The 5th output current I O5With the 6th output current I O6Identical in fact.The 5th current-sharing transformer T that the second equal flow branching 2222 of second group of current-sharing transformer group 222 utilizes second group of current-sharing transformer group 222 B5Primary coil N B5pWith the 6th current-sharing transformer T B6Primary coil N B6pBe connected in series, make to be sent to the 7th group of light-emitting diode G 7With the 8th group of light-emitting diode G 8The 7th output current I O7With the 8th output current I O8Identical in fact.
Because, the first current-sharing transformer T of the ground floor of first group of current-sharing transformer group 221 A1Secondary coil N A1s, first group of current-sharing transformer group 221 the second current-sharing transformer T of ground floor A2Secondary coil N A2s, second group of current-sharing transformer group 222 the first current-sharing transformer T of ground floor B1Secondary coil N B1sAnd the second current-sharing transformer T of the ground floor of second group of current-sharing transformer group 222 B2Primary coil N B2sExport the first equal flow branching 2211 of first group of current-sharing transformer group 221 respectively to, the second equal flow branching 2212 of first group of current-sharing transformer group 221, the current value of first equal flow branching 2221 of second group of current-sharing transformer group 222 and the second equal flow branching 2222 of second group of current-sharing transformer group 222 is identical in fact, therefore, first of the first group of current-sharing transformer group 221 equal flow branching 2211, the second equal flow branching 2212 of first group of current-sharing transformer group 221, the second equal flow branching 2222 of the first equal flow branching 2221 of second group of current-sharing transformer group 222 and second group of current-sharing transformer group 222 is respectively via first output rectification circuit 231, second output rectification circuit 232, the 3rd output rectification circuit 233 and the 4th output rectification circuit 234, the 5th output rectification circuit 235, the 6th output rectification circuit 236, the 7th output rectification circuit 237 and the 8th output rectification circuit 238 export first group of light-emitting diode G to 1, second group of light-emitting diode G 2, the 3rd group of light-emitting diode G 3, the 4th group of light-emitting diode G 4, the 5th group of light-emitting diode G 5, the 6th group of light-emitting diode G 6, the 7th group of light-emitting diode G 7And the 8th group of light-emitting diode G 8The first output current I O1, the second output current I O2, the 3rd output current I O3, the 4th output current I O4, the 5th output current I O5, the 6th output current I O6, the 7th output current I O7And the 8th output current I O8Identical in fact.
See also Figure 11, it is the thin portion circuit diagram of the flow equalizing circuit of another preferred embodiment of the present invention.Shown in Figure 11, flow equalizing circuit 22 comprises many group current-sharing transformer groups and a plurality of coupling inductance, be connected by one deck at least and form and organize each group in the current-sharing transformer group more, in present embodiment, first group of current-sharing transformer group 221, second group of current-sharing transformer group 222 and the 3rd group of current-sharing transformer group 223 each have one deck, and flow equalizing circuit 22 comprises first group of current-sharing transformer group 221, second group of current-sharing transformer group 222, the 3rd group of current-sharing transformer group 223, has the first coupling inductance L of a plurality of inductance C1, the second coupling inductance L C2And the 3rd coupling inductance L C3, the first coupling inductance L wherein C1Comprise first inductance L C11With second inductance L C12, the second coupling inductance L C2Comprise the 3rd inductance L C21With the 4th inductance L C22, the 3rd coupling inductance L C3Comprise the 5th inductance L C31With the 6th inductance L C32
The ground floor of first group of current-sharing transformer group 221 comprises the first current-sharing transformer T A1With the second current-sharing transformer T A2, and the first current-sharing transformer T A1Primary coil N A1p, the second current-sharing transformer T A2Primary coil N A2pWith the first coupling inductance L C1First inductance L C11Power output end (not shown) at current suppling circuit 21 is connected in series.The first current-sharing transformer T A1Secondary coil N A1sWith the second current-sharing transformer T A2Secondary coil N A2sBe connected to first output rectification circuit 231 and second output rectification circuit 232.
Similarly, the ground floor of second group of current-sharing transformer group 222 comprises the first current-sharing transformer T B1With the second current-sharing transformer T B2, and the first current-sharing transformer T B1Primary coil N B1p, the second current-sharing transformer T B2Primary coil N B2pWith the second coupling inductance L C2The 3rd inductance L C21Power output end (not shown) at current suppling circuit 21 is connected in series.The first current-sharing transformer T B1Secondary coil N B1sWith the second current-sharing transformer T B2Secondary coil N B2sBe connected to the 3rd output rectification circuit 233 and the 4th output rectification circuit 234.
Similarly, the ground floor of the 3rd group of current-sharing transformer group 223 comprises the first current-sharing transformer T C1With the second current-sharing transformer T C2, and the first current-sharing transformer T C1Primary coil N C1p, the second current-sharing transformer T C2Primary coil N C2pWith the 3rd coupling inductance L C3The 5th inductance L C31Power output end (not shown) at current suppling circuit 21 is connected in series.The first current-sharing transformer T C1Secondary coil N C1sWith the second current-sharing transformer T C2Secondary coil N C2sBe connected to the 5th output rectification circuit 235 and the 6th output rectification circuit 236.
In addition, the first coupling inductance L C1Second inductance L C12, the second coupling inductance L C2The 4th inductance L C22And the 3rd coupling inductance L C3The 6th inductance L C32Be connected in series, make the coupling inductance L that wins C1Second inductance L C12, the second coupling inductance L C2The 4th inductance L C22And the 3rd coupling inductance L C3The 6th inductance L C32Current value in fact can be identical.Because, the first coupling inductance L C1First inductance L C11With second inductance L C12Intercouple the second coupling inductance L C2The 3rd inductance L C21With the 4th inductance L C22Intercouple, and the 3rd coupling inductance L C3The 5th inductance L C31With the 6th inductance L C32Intercouple, so, the first coupling inductance L C1First inductance L C11, the second coupling inductance L C2The 3rd inductance L C21, the 3rd coupling inductance L C3The 5th inductance L C31, first group of current-sharing transformer group 221 the first current-sharing transformer T A1Secondary coil N A1s, first group of current-sharing transformer group 221 the second current-sharing transformer T A2Secondary coil N A2s, second group of current-sharing transformer group 222 the first current-sharing transformer T B1Secondary coil N B1s, second group of current-sharing transformer group 222 the second current-sharing transformer T B2Secondary coil N B2s, the 3rd group of current-sharing transformer group 223 the first current-sharing transformer T C1Secondary coil N C1sAnd the second current-sharing transformer T of the 3rd group of current-sharing transformer group 223 C2Secondary coil N C2sCurrent value in fact can be identical, and export first group of light-emitting diode G to via first output rectification circuit 231, second output rectification circuit 232, the 3rd output rectification circuit 233 and the 4th output rectification circuit 234, the 5th output rectification circuit 235 and the 6th output rectification circuit 236 respectively 1, second group of light-emitting diode G 2, the 3rd group of light-emitting diode G 3, the 4th group of light-emitting diode G 4, the 5th group of light-emitting diode G 5And the 6th group of light-emitting diode G 6The first output current I O1, the second output current I O2, the 3rd output current I O3, the 4th output current I O4, the 5th output current I O5And the 6th output current I O6Identical in fact.
The turn ratio of the primary coil of each current-sharing transformer and secondary coil (turns ratio) can be selected for use 1: 1 simply in the flow equalizing circuit 22 of the present invention, or adjusted not qualification arbitrarily according to the demand of output current.Similarly, the first coupling inductance L C1First inductance L C11With second inductance L C12Ratio, the second coupling inductance L C2The 3rd inductance L C21With the 4th inductance L C22Ratio and the 3rd coupling inductance L C3The 5th inductance L C31With the 6th inductance L C32Ratio can select for use simply 1: 1, or do not adjust arbitrarily according to the demand of output current and to limit.The first switch Q of the present invention 1, second switch Q 2, the 3rd switch Q 3Or the 4th switch Q 4Can be but be not defined as bipolar junction transistor (Bipolar JunctionTransistor, BJT) or mos field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET).In addition, control circuit 212 of the present invention can be but not be defined as digital signal processor (digital signal processor, DSP), microprocessor (micro processor), pulse width modulation controller (pulse widthmodulation controller, PWM controller) or pulse-frequency modulation controller (pulse frequencymodulation controller, PFM controller).First output rectification circuit 231, second output rectification circuit 232, the 3rd output rectification circuit 233 and the 4th output rectification circuit 234, the 5th output rectification circuit 235, the 6th output rectification circuit 236, the 7th output rectification circuit 237 and the 8th output rectification circuit 238 can be but not be limited to bridge rectifier, half-wave formula rectification circuit or full wave type rectification circuit.
In sum, the current-balancing supply circuit of multi-set DC laden of the present invention utilizes a plurality of current-sharing transformers of flow equalizing circuit or organizes the current-sharing transformer group more, make the current balance type and the luminosity of each group DC load identical, not only simple and circuit complexity is low than traditional circuit, power loss can also less and circuit operational paradigm height.In addition, the current-balancing supply circuit of multi-set DC laden of the present invention use relatively less elements reach a plurality of output current balances and circuit complexity low, and can reduce cost significantly.
Moreover, a plurality of current-sharing transformers of the flow equalizing circuit in the current-balancing supply circuit of multi-set DC laden of the present invention or organize the current-sharing transformer group more and can also not be subjected to the resonant circuit of current suppling circuit and isolating transformer need form the restriction of resonance relation, can select better simply transformer device structure for use, make the current-balancing supply circuit of multi-set DC laden of the present invention have smaller volume and higher current densities, and can be applied to need the electronic product of less element heights, for example use the slim TV of light-emitting diode as backlight, slim screen or slim notebook computer.
The present invention must be appointed by those of ordinary skills and executes that the craftsman thinks and be to modify as all, yet does not all break away from the scope as the desire protection of claim institute.

Claims (48)

1. the current-balancing supply circuit of a multi-set DC laden, in order to drive one first group of DC load and one second group of DC load, the current-balancing supply circuit of this multi-set DC laden comprises at least:
One current suppling circuit produces one first electric current or one first voltage in order to the energy that receives an input voltage, to provide electric energy to this first group of DC load and this second group of DC load;
One flow equalizing circuit is connected with the power output end of this current suppling circuit, and this flow equalizing circuit comprises one first current-sharing transformer and one second current-sharing transformer at least;
One first output rectification circuit is connected between first output of this first group of DC load and this flow equalizing circuit, in order to rectification and produce one first and output current to this first group of DC load; And
One second output rectification circuit is connected between second output of this second group of DC load and this flow equalizing circuit, in order to rectification and produce one second and output current to this second group of DC load;
Wherein, the current-balancing supply circuit of this multi-set DC laden utilizes this first output current of this flow equalizing circuit balance and this second output current.
2. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1, wherein the primary coil of the primary coil of this first current-sharing transformer and this second current-sharing transformer is connected in series at the power output end of this current suppling circuit, and the secondary coil of the secondary coil of this first current-sharing transformer and this second current-sharing transformer is connected in this first output rectification circuit and this second output rectification circuit by first output and second output of this flow equalizing circuit respectively.
3. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1, wherein this flow equalizing circuit also comprises one first coupling inductance, and first inductance of this first coupling inductance and the primary coil of this first current-sharing transformer are connected in series at the power output end of this current suppling circuit, second inductance of this first coupling inductance and the primary coil of this second current-sharing transformer are connected in series at the power output end of this current suppling circuit, and the secondary coil of the secondary coil of this first current-sharing transformer and this second current-sharing transformer is connected in this first output rectification circuit and this second output rectification circuit by first output and second output of this flow equalizing circuit respectively.
4. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1, wherein this first output rectification circuit comprises:
One first main diode, the anode tap of this first main diode are connected in an end of the secondary coil of this first current-sharing transformer, and the cathode terminal of this first main diode is connected in this first group of DC load; And
One diode for the first time, this, anode tap of diode was connected in the other end of the secondary coil of this first current-sharing transformer first time, and this, cathode terminal of diode was connected in this first group of DC load first time.
5. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1, wherein this second output rectification circuit comprises:
One second main diode, the anode tap of this second main diode are connected in an end of the secondary coil of this second current-sharing transformer, and the cathode terminal of this second main diode is connected in this second group of DC load; And
One diode for the second time, this, anode tap of diode was connected in the other end of the secondary coil of this second current-sharing transformer second time, and this, cathode terminal of diode was connected in this second group of DC load second time.
6. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1, wherein this first current-sharing transformer and second current-sharing transformer have centre cap respectively, and are connected to this first group of DC load and this second group of DC load.
7. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1, wherein this first output rectification circuit and this second output rectification circuit are bridge rectifier, half-wave formula rectification circuit or full wave type rectification circuit.
8. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1, wherein the series connection of each self-contained at least one light-emitting diode of second group of DC load of this first group of DC load and this or a plurality of light-emitting diode is connected.
9. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1, wherein this current suppling circuit comprises:
One isolating transformer, the secondary coil of this isolating transformer is connected with the input of this flow equalizing circuit;
One control circuit in order to produce at least one first pulse width modulation signal, makes this current suppling circuit running; And
One switches circuit, the power output end of this commutation circuit is connected in the primary coil of this isolating transformer, the control end of this commutation circuit is connected in this control circuit, in order to according to this first pulse width modulation signal, make the energy selectivity ground of this input voltage be sent to the primary coil of this isolating transformer via this commutation circuit.
10. the current-balancing supply circuit of multi-set DC laden as claimed in claim 9, wherein this commutation circuit comprises:
One first switch, first end of this first switch is connected in the primary coil of this isolating transformer, and the control end of this first switch is connected in this control circuit, in order to according to this first pulse width modulation signal conduction or end; And
One second switch, second end of this second switch are connected in the primary coil of this isolating transformer and first end of this first switch, in order to the one second pulse width modulation signal conduction that produces according to this control circuit or end;
Wherein, this control circuit is controlled this first switch and second switch conducting respectively or is ended by this first pulse width modulation signal and this second pulse width modulation signal, the energy selectivity ground that makes this input voltage is sent to the primary coil of this isolating transformer via this first switch or this second switch, makes the primary coil of this isolating transformer produce change in voltage.
11. the current-balancing supply circuit of multi-set DC laden as claimed in claim 10, wherein this commutation circuit also comprises:
One the 3rd switch, first end of the 3rd switch is connected in the primary coil of this isolating transformer, second end of the 3rd switch is connected with second end of this first switch, the control end of the 3rd switch is connected in this control circuit, in order to one the 3rd pulse width modulation signal conduction that produces according to this control circuit or end; And
One the 4th switch, second end of the 4th switch is connected in first end of the 3rd switch and the primary coil of this isolating transformer, the control end of the 4th switch is connected in this control circuit, in order to one the 4th pulse width modulation signal conduction that produces according to this control circuit or end;
Wherein, this control circuit is controlled this first switch, this second switch, the 3rd switch and the 4th switch conduction respectively or is ended by this first pulse width modulation signal, this second pulse width modulation signal, the 3rd pulse width modulation signal and the 4th pulse width modulation signal that produce, the energy selectivity ground that makes this input voltage is sent to this primary coil of this isolating transformer via this first switch, this second switch, the 3rd switch or the 4th switch, makes the primary coil of this isolating transformer produce change in voltage.
12. the current-balancing supply circuit of multi-set DC laden as claimed in claim 11, wherein this first switch, this second switch, the 3rd switch or the 4th switch are bipolar transistor or mos field effect transistor.
13. the current-balancing supply circuit of multi-set DC laden as claimed in claim 9, wherein this control circuit is digital signal processor, microprocessor, pulse width modulation controller or pulse-frequency modulation controller.
14. the current-balancing supply circuit of multi-set DC laden as claimed in claim 9, wherein this current suppling circuit also comprises a resonant circuit, is connected between the primary coil of the power output end of this commutation circuit and this isolating transformer.
15. the current-balancing supply circuit of multi-set DC laden as claimed in claim 14, wherein this resonant circuit comprises a resonant capacitance, is connected in series between the primary coil of the power output end of this commutation circuit and this isolating transformer.
16. the current-balancing supply circuit of multi-set DC laden as claimed in claim 15, wherein this resonant circuit also comprises a resonant inductance, and this resonant inductance and this resonant capacitance are connected in series between the primary coil of the power output end of this commutation circuit and this isolating transformer.
17. the current-balancing supply circuit of multi-set DC laden as claimed in claim 1, also comprise a rectification circuit, the output of this rectification circuit is connected in the power input of this current suppling circuit by a bus, in order to this input voltage rectification producing a bus voltage, and provide power input to this current suppling circuit.
18. the current-balancing supply circuit of multi-set DC laden as claimed in claim 17 also comprises a bus capacitance, is connected in this bus, in order to filtering and storage of electrical energy.
19. 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:
One current suppling circuit produces one first electric current or one first voltage in order to the energy that receives an input voltage, to provide electric energy to described multi-set DC laden;
One flow equalizing circuit is connected with the power output end of this current suppling circuit, and this flow equalizing circuit comprises many group current-sharing transformer groups and at least one first coupling inductance, and in described many group current-sharing transformer groups each is organized by one deck at least and formed; And
A plurality of output rectification circuits, in described a plurality of output rectification circuit each is corresponding separately to be connected between one group of DC load of output of this flow equalizing circuit and described multi-set DC laden, in order to rectification respectively and produce a plurality of described multi-set DC ladens that output current to respectively;
Wherein, the current-balancing supply circuit of this multi-set DC laden utilizes the described a plurality of output currents of this flow equalizing circuit balance.
20. the current-balancing supply circuit of multi-set DC laden as claimed in claim 19, wherein this flow equalizing circuit also comprises one second coupling inductance.
21. the current-balancing supply circuit of multi-set DC laden as claimed in claim 20, wherein this flow equalizing circuit also comprises one the 3rd coupling inductance.
22. the current-balancing supply circuit of multi-set DC laden as claimed in claim 21, wherein this first coupling inductance comprises one first inductance and one second inductance, this second coupling inductance comprises one the 3rd inductance and one the 4th inductance, and the 3rd coupling inductance comprises one the 5th inductance and one the 6th inductance.
23. the current-balancing supply circuit of multi-set DC laden as claimed in claim 22, wherein said many group current-sharing transformer groups comprise one first group of current-sharing transformer group, one second group of current-sharing transformer group and one the 3rd group of current-sharing transformer group, each ground floor of organizing this current-sharing transformer group comprises one first current-sharing transformer and one second current-sharing transformer
Wherein, this first inductance of the primary coil of the primary coil of this first current-sharing transformer of this first group of current-sharing transformer group, this second current-sharing transformer of this first group of current-sharing transformer group and this first coupling inductance is connected in series at the power output end of this current suppling circuit, and the secondary coil of the secondary coil of this first current-sharing transformer of this first group of current-sharing transformer group and this second current-sharing transformer of this first group of current-sharing transformer group is connected to first and second output rectification circuit of described a plurality of output rectification circuits;
Wherein, the primary coil of the primary coil of this first current-sharing transformer of this second group of current-sharing transformer group, this second current-sharing transformer of this second group of current-sharing transformer group and the 3rd inductance of this second coupling inductance are connected in series at the power output end of this current suppling circuit, and the secondary coil of the secondary coil of this first current-sharing transformer of this second group of current-sharing transformer group and this second current-sharing transformer of this second group of current-sharing transformer group is connected to the 3rd and the 4th output rectification circuit of described a plurality of output rectification circuits;
Wherein, the primary coil of this second current-sharing transformer of the primary coil of this first current-sharing transformer of the 3rd group of current-sharing transformer group, the 3rd group of current-sharing transformer group and the 5th inductance of the 3rd coupling inductance are connected in series at the power output end of this current suppling circuit, and the secondary coil of this second current-sharing transformer of the secondary coil of this first current-sharing transformer of the 3rd group of current-sharing transformer group and the 3rd group of current-sharing transformer group is connected to the 5th and the 6th output rectification circuit of described a plurality of output rectification circuits; And
Wherein, the 4th inductance of this second inductance of this first coupling inductance, this second coupling inductance and the 6th inductance of the 3rd coupling inductance are connected in series.
24. the current-balancing supply circuit of multi-set DC laden as claimed in claim 19, each of wherein said a plurality of output rectification circuits are bridge rectifier, half-wave formula rectification circuit or full wave type rectification circuit.
25. the current-balancing supply circuit of multi-set DC laden as claimed in claim 19, each self-contained at least one light-emitting diode of wherein said multi-set DC laden or the series connection of a plurality of light-emitting diode connect.
26. the current-balancing supply circuit of multi-set DC laden as claimed in claim 19, wherein this current suppling circuit comprises:
One isolating transformer, the secondary coil of this isolating transformer is connected with the input of this flow equalizing circuit;
One control circuit in order to produce at least one first pulse width modulation signal, makes this current suppling circuit running; And
One switches circuit, the power output end of this commutation circuit is connected in the primary coil of this isolating transformer, the control end of this commutation circuit is connected in this control circuit, in order to according to this first pulse width modulation signal, make the energy selectivity ground of this input voltage be sent to the primary coil of this isolating transformer via this commutation circuit.
27. the current-balancing supply circuit of multi-set DC laden as claimed in claim 26, wherein this commutation circuit comprises:
One first switch, first end of this first switch is connected in the primary coil of this isolating transformer, and the control end of this first switch is connected in this control circuit, in order to according to this first pulse width modulation signal conduction or end; And
One second switch, second end of this second switch are connected in the primary coil of this isolating transformer and first end of this first switch, in order to the one second pulse width modulation signal conduction that produces according to this control circuit or end;
Wherein, this control circuit is controlled this first switch and second switch conducting respectively or is ended by this first pulse width modulation signal and this second pulse width modulation signal, the energy selectivity ground that makes this input voltage is sent to the primary coil of this isolating transformer via this first switch or this second switch, makes the primary coil of this isolating transformer produce change in voltage.
28. the current-balancing supply circuit of multi-set DC laden as claimed in claim 27, wherein this commutation circuit also comprises:
One the 3rd switch, first end of the 3rd switch is connected in the primary coil of this isolating transformer, second end of the 3rd switch is connected with second end of this first switch, the control end of the 3rd switch is connected in this control circuit, in order to one the 3rd pulse width modulation signal conduction that produces according to this control circuit or end; And
One the 4th switch, second end of the 4th switch is connected in first end of the 3rd switch and the primary coil of this isolating transformer, the control end of the 4th switch is connected in this control circuit, in order to one the 4th pulse width modulation signal conduction that produces according to this control circuit or end;
Wherein, this control circuit is controlled this first switch, this second switch, the 3rd switch and the 4th switch conduction respectively or is ended by this first pulse width modulation signal, this second pulse width modulation signal, the 3rd pulse width modulation signal and the 4th pulse width modulation signal that produce, the energy selectivity ground that makes this input voltage is sent to this primary coil of this isolating transformer via this first switch, this second switch, the 3rd switch or the 4th switch, makes the primary coil of this isolating transformer produce change in voltage.
29. the current-balancing supply circuit of multi-set DC laden as claimed in claim 26, wherein this current suppling circuit also comprises a resonant circuit, is connected between the primary coil of the power output end of this commutation circuit and this isolating transformer.
30. the current-balancing supply circuit of multi-set DC laden as claimed in claim 29, wherein this resonant circuit comprises a resonant capacitance, is connected in series between the primary coil of the power output end of this commutation circuit and this isolating transformer.
31. the current-balancing supply circuit of multi-set DC laden as claimed in claim 30, wherein this resonant circuit also comprises a resonant inductance, and this resonant inductance and this resonant capacitance are connected in series between the primary coil of the power output end of this commutation circuit and this isolating transformer.
32. the current-balancing supply circuit of multi-set DC laden as claimed in claim 19, also comprise a rectification circuit, the output of this rectification circuit is connected in the power input of this current suppling circuit by a bus, in order to this input voltage rectification producing a bus voltage, and provide power input to this current suppling circuit.
33. the current-balancing supply circuit of multi-set DC laden as claimed in claim 32 also comprises a bus capacitance, is connected in this bus, in order to filtering and storage of electrical energy.
34. 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:
One current suppling circuit produces one first electric current or one first voltage in order to the energy that receives an input voltage, to provide electric energy to described multi-set DC laden;
One flow equalizing circuit is connected with the power output end of this current suppling circuit, and this flow equalizing circuit comprises one first group of current-sharing transformer group, and this first group of current-sharing transformer group is made up of one deck at least; And
A plurality of output rectification circuits, in described a plurality of output rectification circuit each is corresponding separately to be connected between one group of DC load of output of this flow equalizing circuit and described multi-set DC laden, in order to rectification respectively and produce a plurality of described multi-set DC ladens that output current to respectively;
Wherein, the current-balancing supply circuit of this multi-set DC laden utilizes the described a plurality of output currents of this flow equalizing circuit balance.
35. the current-balancing supply circuit of multi-set DC laden as claimed in claim 34, wherein the ground floor of this first group of current-sharing transformer group comprises a plurality of current-sharing transformers, the second layer of this first group of current-sharing transformer group comprises a plurality of equal flow branchings, each this equal flow branching comprises a plurality of current-sharing transformers, the primary coil to the small part current-sharing transformer of described a plurality of current-sharing transformers of each this equal flow branching is connected in series in the secondary coil of the current-sharing transformer of last layer correspondence, and each secondary coil of described a plurality of current-sharing transformers of last one deck of this first group of current-sharing transformer group is connected in the output rectification circuit of a correspondence.
36. the current-balancing supply circuit of multi-set DC laden as claimed in claim 35, wherein the primary coil of each current-sharing transformer of the ground floor of this first group of current-sharing transformer group is connected in series at the power output end of this current suppling circuit.
37. the current-balancing supply circuit of multi-set DC laden as claimed in claim 34, wherein this flow equalizing circuit also comprises at least one coupling inductance and one second group of current-sharing transformer group, the ground floor of this first group of current-sharing transformer group comprises a plurality of current-sharing transformers, the ground floor of this second group of current-sharing transformer group comprises a plurality of current-sharing transformers, wherein the primary coil of each current-sharing transformer of the ground floor of this first group of current-sharing transformer group and this coupling inductance inductance is connected in series at the power output end of this current suppling circuit, and another inductance of the primary coil of each current-sharing transformer of the ground floor of this second group of current-sharing transformer group and this coupling inductance is connected in series at the power output end of this current suppling circuit.
38. the current-balancing supply circuit of multi-set DC laden as claimed in claim 37, wherein the second layer of this first group of current-sharing transformer group and this second group of current-sharing transformer group comprises a plurality of equal flow branchings respectively.
39. the current-balancing supply circuit of multi-set DC laden as claimed in claim 34, each of wherein said a plurality of output rectification circuits are bridge rectifier, half-wave formula rectification circuit or full wave type rectification circuit.
40. the current-balancing supply circuit of multi-set DC laden as claimed in claim 34, each self-contained at least one light-emitting diode of wherein said multi-set DC laden or the series connection of a plurality of light-emitting diode connect.
41. the current-balancing supply circuit of multi-set DC laden as claimed in claim 34, wherein this current suppling circuit comprises:
One isolating transformer, the secondary coil of this isolating transformer is connected with the input of this flow equalizing circuit;
One control circuit in order to produce at least one first pulse width modulation signal, makes this current suppling circuit running; And
One switches circuit, the power output end of this commutation circuit is connected in the primary coil of this isolating transformer, the control end of this commutation circuit is connected in this control circuit, in order to according to this first pulse width modulation signal, make the energy selectivity ground of this input voltage be sent to the primary coil of this isolating transformer via this commutation circuit.
42. the current-balancing supply circuit of multi-set DC laden as claimed in claim 41, wherein this commutation circuit comprises:
One first switch, first end of this first switch is connected in the primary coil of this isolating transformer, and the control end of this first switch is connected in this control circuit, in order to according to this first pulse width modulation signal conduction or end; And
One second switch, second end of this second switch are connected in the primary coil of this isolating transformer and first end of this first switch, in order to the one second pulse width modulation signal conduction that produces according to this control circuit or end;
Wherein, this control circuit is controlled this first switch and second switch conducting respectively or is ended by this first pulse width modulation signal and this second pulse width modulation signal, the energy selectivity ground that makes this input voltage is sent to the primary coil of this isolating transformer via this first switch or this second switch, makes the primary coil of this isolating transformer produce change in voltage.
43. the current-balancing supply circuit of multi-set DC laden as claimed in claim 42, wherein this commutation circuit also comprises:
One the 3rd switch, first end of the 3rd switch is connected in the primary coil of this isolating transformer, second end of the 3rd switch is connected with second end of this first switch, the control end of the 3rd switch is connected in this control circuit, in order to one the 3rd pulse width modulation signal conduction that produces according to this control circuit or end; And
One the 4th switch, second end of the 4th switch is connected in first end of the 3rd switch and the primary coil of this isolating transformer, the control end of the 4th switch is connected in this control circuit, in order to one the 4th pulse width modulation signal conduction that produces according to this control circuit or end;
Wherein, this control circuit is controlled this first switch, this second switch, the 3rd switch and the 4th switch conduction respectively or is ended by this first pulse width modulation signal, this second pulse width modulation signal, the 3rd pulse width modulation signal and the 4th pulse width modulation signal that produce, the energy selectivity ground that makes this input voltage is sent to this primary coil of this isolating transformer via this first switch, this second switch, the 3rd switch or the 4th switch, makes the primary coil of this isolating transformer produce change in voltage.
44. the current-balancing supply circuit of multi-set DC laden as claimed in claim 41, wherein this current suppling circuit also comprises a resonant circuit, is connected between the primary coil of the power output end of this commutation circuit and this isolating transformer.
45. the current-balancing supply circuit of multi-set DC laden as claimed in claim 44, wherein this resonant circuit comprises a resonant capacitance, is connected in series between the primary coil of the power output end of this commutation circuit and this isolating transformer.
46. the current-balancing supply circuit of multi-set DC laden as claimed in claim 45, wherein this resonant circuit also comprises a resonant inductance, and this resonant inductance and this resonant capacitance are connected in series between the primary coil of the power output end of this commutation circuit and this isolating transformer.
47. the current-balancing supply circuit of multi-set DC laden as claimed in claim 34, also comprise a rectification circuit, the output of this rectification circuit is connected in the power input of this current suppling circuit by a bus, in order to this input voltage rectification producing a bus voltage, and provide power input to this current suppling circuit.
48. the current-balancing supply circuit of multi-set DC laden as claimed in claim 47 also comprises a bus capacitance, is connected in this bus, in order to filtering and storage of electrical energy.
CN200910139229.2A 2009-04-27 2009-04-27 Current-balancing supply circuit with multiple groups of DC loads Active CN101873739B (en)

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WO2013010461A1 (en) * 2011-07-18 2013-01-24 张曦春 Self-oscillating inverter power supply having continuously variable output frequency, and constant current driver power supply
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CN103677028A (en) * 2013-12-19 2014-03-26 华为技术有限公司 Digital current equalizing method and power supply module
CN107635312A (en) * 2015-06-19 2018-01-26 青岛海信电器股份有限公司 A kind of LED drive circuit and liquid crystal display device
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CN112350299A (en) * 2020-10-23 2021-02-09 苏州浪潮智能科技有限公司 Electronic equipment and power supply unit thereof
CN113257198A (en) * 2021-05-24 2021-08-13 四川长虹电器股份有限公司 Driving circuit applied to backlight of LED television

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