CN101951159A - Capacitor isolated type multipath constant current output resonant mode DC/DC transformer - Google Patents
Capacitor isolated type multipath constant current output resonant mode DC/DC transformer Download PDFInfo
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Abstract
The invention relates to a transformer used for realizing balanced current output among multipath outputs, aiming at providing a capacitor isolated type multipath constant current output resonant mode DC/DC transformer. The transformer comprises a DC input, a primary-side topology comprising a plurality of switches, a secondary-side rectifier, and a resonance network comprising two resonance circuit branches, wherein each resonance circuit branch respectively comprises one resonance capacitor and one resonance inductor which are connected in series, and each resonance circuit branch is connected between one output end of the primary-side topology and one input end of the secondary-side rectifier. In the invention, a traditional isolated transformer is omitted, therefore, the circuit structure is simplified, the cost is reduced, and simple and efficient multipath constant source outputs are realized; and the invention is particularly suitable for the driving of multi-series LEDs.
Description
Technical field
The present invention relates to a kind of multi-channel output direct stream/direct current resonant mode current transformer of isolating, realize current balance output between the multichannel output based on electric capacity.Be meant the isolation that realizes output current equilibrium and input and output based on the resonant capacitance of resonant circuit simultaneously especially,
Background technology
At present, along with the development of LED technology, the LED illumination is a kind of lighting solutions of environmental protection, compares with the traditional lighting scheme to have incomparable advantage.Usually owing to be subjected to restrictions such as encapsulation, heating, but general power all maintains 1W-3W to the power of single high-brightness LED light source.In needs high power, highlight illumination occasion, as street lamp, plaza lighting etc., use usually need combine many LED.The brightness of LED is directly related with the electric current that it flows through: in general, the electric current that flows through LED is big more, and its brightness will be big more.In order to realize the luminance proportion of a plurality of LED, usually a plurality of LED series connection are used.Yet, when the LED number of series connection surpasses some, can cause the led driver output voltage very high, cause that output filter capacitor is withstand voltage, circuit insulating Design difficulty.Therefore, when the needs high-power illumination, generally multi-string LED is carried out parallel connection, and realize that current balance between the every string LED is to the useful life of LED and the equilibrium of brightness becoming very important.Therefore need a kind of power supply of multichannel output that can provide to be used to drive multi-string LED, realize the current balance between its Current Control and the every string.
Traditional linear current source method is utilized semiconductor switch, as the operate in saturation district of triode or metal-oxide-semiconductor field effect t (MOSFET) amplification region realize electric current all with, but system loss is big, inefficiency is not suitable for more powerful application.Shown in Figure 1 is a LED driving power schematic diagram commonly used, exchange input by comparatively stable dc bus of a high power factor rectification output (as 380 or 400V), the DC/DC current transformer of isolating by a band produces a stable direct current output driving multi-string LED, utilize linear current source to connect, realize the equilibrium of electric current with every string LED.The structure of current source is referring to the right half part of Fig. 1, and it is realized by gate-controlled switch M1, resistance R and operational amplifier U0.
Traditional back level Switching Power Supply method of adjustment is exactly by independent DC/DC current transformer of each output, controls the output current of every string LED respectively, realizes Current Control and mutual current balance, as shown in Figure 2.The typical buck converter (BUCK circuit) of DC/DC current transformer among Fig. 2 for constituting by switching tube M2, inductance L, capacitor C and diode D.Be input to final output from interchange, through PFC and 2 grades of DC/DC conversion, 3 grades of conversion altogether need a plurality of controllers, switch etc., so system changeover progression are too much, shortcomings such as system cost height.
For reducing cost, also have some to realize the method for a plurality of output current equilibriums based on passive devices such as inductance or electric capacity, all have usually the current balance progress relatively poor, need shortcomings such as extra passive device, systemic circulation energy are big.
Simultaneously, because light fixture ground connection or consideration human body touch may, requirement based on security consideration and system design, usually driver need be realized the electrical isolation between the input and output, with the requirement (requiring) of satisfying safety as UL60950-1 and the relevant safety of IEC, especially input has under the situation of electric path with grid side, comprises leakage current current requirements and DC-isolation requirement under the mains frequency.Usually, need the electrical isolation between the transformer realization input and output, satisfy the safety requirement.In Fig. 1 and Fig. 2, the PFC link is non-isolation, has directly with grid side to be electrically connected, and and then the DC/DC current transformer of PFC need be realized isolating.In addition, because the difference of input and output voltage also needs transformer to satisfy the coupling of input and output voltage, input voltage as DC/DC is 400V, output 20V, common current transformer topology gain limited (as 0.5), therefore needing a turn ratio is that 10 transformer obtains the output voltage that needs.But the common volume of transformer is bigger, is unfavorable for miniaturization, slimming problems such as (low profile), problem such as efficient is lower under the high frequencyization.
Therefore, how to realize the power converter that high efficiency, low cost, littler, thinner multiple constant current are exported, still have a lot of technological challenges.
Summary of the invention
The technical problem to be solved in the present invention is, overcome expensive, the problem such as efficient is low, volume is big of multiple constant current output, a kind of circuit based on the series resonance current transformer is proposed, on the basis that does not increase the circuit additional devices, utilize the resonant capacitance of resonant circuit self to realize multiple constant current output, safety isolation (the transless method realizes isolating safely) and high-precision current equilibrium, can realize the slimming of low cost, high efficiency, driver etc., be specially adapted to multi-string LED and drive.
Be the technical solution problem, technical scheme of the present invention is:
A kind of electric capacity isolated form multiple constant current export resonance formula DC/DC converter is provided, comprises: the direct current input; Former limit topology comprises a plurality of switches, with described direct current input coupling, has 2 outputs, converts described direct current input to an AC signal at output port; Resonant network receives described AC signal, and it is outputed to the secondary rectifier; The secondary rectifier has 2 inputs, is coupled with described resonant network; And have 2 outputs, to drive 2 tunnel loads; Described resonant network comprises 2 resonance branch roads, and each resonance branch road is in series by 1 resonant capacitance and 1 resonant inductance, and each resonance branch road is connected between the input of output of described former limit topology and secondary rectifier.
As a kind of improvement, also comprise 1 common mode inductance in the described resonant network.
Further, the present invention also provides a kind of electric capacity isolated form multiple constant current export resonance formula DC/DC converter, comprising: the direct current input; Former limit topology comprises a plurality of switches, with described direct current input coupling, has 2 outputs, converts described direct current input to an AC signal at output port; N resonant network parallel with one another receives described AC signal, and it outputed to each self-corresponding output module; N output module comprises a secondary rectifier separately; Described secondary rectifier has 2 inputs, is coupled respectively with a described n resonant network, and has 2 outputs to drive 2 tunnel loads; Each resonant network includes 2 resonance branch roads, and each resonance branch road is in series by 1 resonant capacitance and 1 resonant inductance, and each resonance branch road is connected between the input of output of described former limit topology and secondary rectifier.
As a kind of improvement, in the described n output module, coupling in twos realizes the current balance between a plurality of outputs between the adjacent resonant inductance of two groups of adjacent output modules.
Further, the present invention also provides a kind of electric capacity isolated form multiple constant current export resonance formula DC/DC converter, comprising: a former limit topology, comprise a plurality of switches, with direct current input coupling, have 2 outputs, convert described direct current input to an AC signal at output port; At least 2 output modules, each output module comprise the winding of a balancing capacitance, a secondary rectifier and at least one common mode inductance separately; Described secondary rectifier has 2 inputs, after described balancing capacitance and described common mode windings in series, is connected to a resonant network; The secondary rectifier also has 2 outputs to drive 2 tunnel loads; A resonant network comprises 2 resonant capacitances and at least 1 resonant inductance, receives described AC signal, and it is outputed to each output module; In two groups of adjacent output modules, the winding of described common mode inductance intercouples, and realizes the current balance between a plurality of outputs.
As a kind of improvement, described former limit topology is symmetrical half bridge topology, full-bridge topology or asymmetrical half-bridge topology.
As a kind of improvement, described resonant capacitance is a safety electric capacity, realizes the input and output isolation.
As a kind of improvement, described secondary rectifier is dual output full bridge structure or dual output multiplication of voltage structure.
Among the present invention, during less than a set point, the duty ratio of switch is 50% to a plurality of switches at switching frequency in the topology of described former limit.When switching frequency is higher than a set point, work in the discontinuous operation pattern.
Among the present invention, described DC input voitage can be regulated based on feedback signal.
Among the present invention, described former limit topology is output as the AC signal of a duty ratio 50%.
Beneficial effect of the present invention is:
The present invention has saved traditional isolating transformer, has simplified circuit structure, reduces cost, and realizes simply and efficiently multiple constant current source output, is particularly suitable for the driving of multi-string LED.
Description of drawings
Fig. 1 is that prior art adopts the linear current source method to realize the current-sharing of LED string;
Fig. 2 is that prior art adopts back level Switching Power Supply method of adjustment to realize the current-sharing of LED string;
Fig. 3 is traditional semi-bridge type series resonance DC/DC converter circuit figure;
Fig. 4 is traditional series resonance current transformer output voltage gain curve shown in Figure 3;
Fig. 5 is the differentiation schematic diagram of a specific embodiment of the present invention;
Fig. 6 is the simulation waveform figure of one embodiment of the invention circuit 100;
Fig. 7 is another specific embodiment of the present invention;
Fig. 8 is a plurality of embodiment schematic block diagrams of the present invention;
Fig. 9 is an embodiment of band common mode inductance of the present invention;
Figure 10 is the specific embodiment that the present invention is applied to multichannel output;
Figure 11 is another specific embodiment that the present invention is applied to multichannel output;
Figure 12 is a kind of control strategy of illustrated embodiment of the present invention;
Figure 13 is the another kind of control strategy of illustrated embodiment of the present invention.
Embodiment
The present invention is intended to propose a kind of low cost, high performance isolated form multiple constant current export resonance current transformer (also can be described as power supply), be particularly suitable for driving the multi-string LED load, on the basis that does not increase additional devices, realize current balance each other, and realize transformerless electrical isolation, make current transformer to overcome the defective of prior art.
Below in conjunction with accompanying drawing the present invention is done detailed description.By description to the specific embodiment of the invention, easy to understand feature of the present invention and details more.
For realizing the power supply miniaturization, high frequency work is an important method that improves its power density, and for to keep higher conversion efficiency, soft-switching converter topology especially resonant current transformer topology has special advantages under high-frequency work.
With a traditional semi-bridge type series resonance DC/DC current transformer shown in Figure 3 is example, its former limit topology (comprises a plurality of switches, also can be described as former limit converter or former limit topological structure) be half-bridge, secondary is a full-bridge rectification, former secondary adopts transformer isolation, realize a direct current output, its input is reduced to a direct current (can be the direct current output of Fig. 1 or PFC shown in Figure 2).One skilled in the art will appreciate that its former limit also can be a full bridge structure; The secondary rectification also can be multiplication of voltage structure or all-wave structure.Fig. 4 is its output voltage gain curve (relation of output voltage gain and frequency).
Figure 5 shows that the concrete evolutionary process of a specific embodiment of the present invention, be used to illustrate how the present invention is based on traditional series resonance current transformer topology utilizes its resonant capacitance to realize isolating and realize the output of 2 road current balances.
General knowledge based on this area, because in the series resonant circuit, resonant inductance Lr can be outside independent inductance, also can be the leakage inductance of transformer or both combinations, therefore the leakage inductance of transformer can be fully utilized, and transformer simply equivalence is ideal transformer (effect of voltage change ratio is only arranged).Be not more than at output voltage under the situation of input voltage (transformer turn ratio n＞1), based on series resonant circuit output voltage gain curve shown in Figure 4, increase switching frequency, can reduce its gain, the voltage change ratio of transformer can be realized by the adjusting of switching frequency, like this, under the situation of not considering electrical isolation, circuit can equivalence be a circuit shown in Fig. 5 (B).On this basis, by resonant capacitance Cr being split as 2 (Cr1 and Cr2, capacitance is 2 times of original Cr), simultaneously, resonant inductance Lr is split as 2 equal resonant inductance Lr1 and Lr2 (its inductance value is half of Lr), realizes the coupling of impedance, shown in (C) among Fig. 5.Appearance value after Cr1 and Cr2 series connection is consistent with original Cr, the inductance value after Lr1 and the Lr2 series connection and originally Lr was consistent, so the work safety unanimity of circuit.Because electric capacity self has the DC-isolation effect, for realizing that satisfying safety requires (electrical network is input to the isolation of output), by resonant capacitance Cr1 and Cr2 choice of capacity, can satisfy the leakage current requirement under the mains frequency of safety, therefore, transformerless series resonant circuit shown in (C) has possessed DC-isolation and input grid side and the function of exporting isolation among Fig. 5, and Cr1 and Cr2 not only have the original function of resonant capacitance, also possess the function that input and output side safety is isolated simultaneously.Dotted line is depicted as the isolating points of circuit among Fig. 5 (C), with the resonant capacitance is exactly to isolate the line of demarcation, and the dotted line left side is equivalent to former avris (input side), and the right is equivalent to secondary side (outlet side).In follow-up specification, all in like manner, repeated description no longer.
At last, by the full-bridge rectifier Dr1 of outlet side and the tie point of Dr2 are disconnected, form 2 outputs, simultaneously output capacitance Co is split as the filtering that Co1 and Co2 are respectively applied for 2 outputs, as shown in Fig. 5 (D) (circuit 100), Here it is a specific embodiment of the present invention, the isolation of realization transless and the output of 2 road current balances.
Generally say, secondary rectifier shown in Fig. 5 D (perhaps output rectifier), be a dual output full-bridge rectification structure (following full bridge structure or the dual output full bridge structure of also being called for short), comprise first diode, second diode, the 3rd diode, the 4th diode, first output capacitance and second output capacitance; The anode of the negative electrode of wherein said first diode and described the 4th diode is coupled in together, as the first input end of described secondary rectifier; The anode of the negative electrode of described second diode and described the 3rd diode is coupled in together, as second input of described secondary rectifier; The negative electrode of described first diode is as first output of described secondary rectifier; The negative electrode of described second diode is as second output of described secondary rectifier; Described first output capacitance is coupled in first output of described secondary rectifier and secondary with reference between the ground; Described second output capacitance is coupled in second output of described secondary rectifier and secondary with reference between the ground.
The work wave of circuit 100 as shown in Figure 6, Fig. 6 (A) is presented at the waveform under the impartial situation of two output voltage, Fig. 6 (B) shows the waveform under the unequal situation of two output voltage.Based on the capacitance charge principle for balance, no matter whether 2 road output voltages equate, circuit all can guarantee the equilibrium of two-way output current, difference is when two output voltage equates, DC voltage component sum on resonant capacitance Cr1 and the Cr2 is half of input voltage, and when two output voltage was unequal, the DC voltage component sum on resonant capacitance Cr1 and the Cr2 was half of input voltage and two output voltage difference sum.
In the embodiment shown in Fig. 5 D, its resonant inductance Lr can be on the left side of resonant capacitance (former avris), also can be with resonant inductance on the right of resonant capacitance (secondary side).This does not influence the work and the essence of the present invention of circuit.
Fig. 5 (D) and embodiment illustrated in fig. 7 in, former limit topology all is example with the half-bridge, those skilled in the art will know that, its former limit topology can be a full-bridge, symmetrical half bridge or asymmetrical half-bridge topology, the secondary rectifier can be dual output full bridge structure (perhaps being called bridge architecture) or dual output multiplication of voltage structure, as shown in Figure 8, it is a general schematic view of the embodiment of the invention, comprise 3 parts, former limit topology (comprises a plurality of switches, also can be described as former limit topological structure), have 2 output terminals A and B, 2 input port a1 and b1 accept the input direct current signal, by switch motion, change the direct current signal of input into an AC signal on output port A and B, the high frequency ac signal of its output is input to resonant network, 2 outputs of resonant network are connected to 2 inputs (a2 and b2) of secondary rectifier, form the output of 2 road current balances, drive 2 tunnel loads.Resonant network is 4 port network, comprise 2 resonant inductances and 2 resonant capacitances, the series connection back forms 2 resonance branch roads (LC resonance branch road) respectively, be connected between the input of the output of a former limit topology and a secondary rectifier, promptly between A among the figure and a2, B and the b2, be used for isolation, current balance and energy and transmit.Can carry out various combination to different former limit topology, secondary rectifier shown in Figure 8, produce different embodiment, no longer exhaustive herein.
Rectifier switch is represented with diode in Fig. 4, Fig. 7 and secondary rectifier structure shown in Figure 8.But those skilled in the art can know that for raising the efficiency, diode rectifier can be replaced by synchronous rectifier (MOSFET), and the drain electrode of synchronous rectification MOSFET and source electrode are connected to the negative electrode and the anode of corresponding rectifier diode.About the driving of synchronous rectifier, related content surpass the present invention at theme.Simple and clear for narrating, the control of relative synchronous rectification and driving thereof are no longer described in detail, all are that example is narrated with the diode rectification.
When led driver is applied to input grounding or output ground connection occasion, under the strict especially situation of the leakage current requirement that perhaps input and output side is isolated, can in resonant network shown in Figure 8, seal in common mode inductance, as shown in Figure 9.The existence of common mode inductance CM makes that common code impedance is very big over the ground, and is very little to the differential-mode current impedance of transmitting energy, thereby effectively suppresses common mode current or leakage current over the ground, but to the not influence of normal circuit working.
In the above-described embodiments, as signal, resonant inductance or common mode inductance are all at former avris (input side), those skilled in the art will be appreciated that, these elements and resonant capacitance belong to series relationship, and the variation (no matter in former avris or secondary side) of the relative position of itself and resonant capacitance does not influence its work and essence of the present invention.
Fig. 5 D, Fig. 7 and the occasion that can be extended to multichannel output easily embodiment illustrated in fig. 8.As shown in figure 10, the secondary rectifier is an example with the dual output full bridge structure still.Utilize intercoupling between the resonant inductance, realize the current balance between a plurality of outputs.To a plurality of output modules of m (m is a natural number), can realize 2m output.Each output module comprises a resonant network and a secondary rectifier (output rectifier), and both connect the lotus root of connecting, and as shown in figure 10, form 2 outputs subsequently, drive 2 tunnel loads.Each output module is parallel to 2 outputs of former limit topology.Between each module, by the coupling realization current-sharing of resonant inductance, as the Lr2 of first module and a resonant inductance Lr3 coupling of the 2nd module, promptly Lr (2i) intercouples with Lr (2i+1), realizes the current balance between each output module.Equilibrium in each module all realizes its essence and embodiment illustrated in fig. 7 in full accord by the balanced electric capacity of the resonance of 2 series connection.Equilibrium between a plurality of modules then realizes that by the coupling of resonant inductance coupling inductance has also realized the multiplexing of function simultaneously like this, promptly is the resonant inductance of series resonant circuit, also is simultaneously the balanced inductance between a plurality of output modules.
Another specific embodiment that is the present invention in multichannel output shown in Figure 11 comprises a plurality of output modules, utilizes electric capacity to realize isolating, and utilizes the isolation between coupling inductance realization output module.Embodiment shown in Figure 10 relatively, the quantity that it can significantly reduce isolation capacitance helps to reduce leakage current, satisfies the safety requirement better.In this embodiment, the secondary rectifier is an example with the dual output full bridge structure still.Can be with resonant inductance on the right side of resonant capacitance (as Figure 11), can be 1 also in its left side, also can be 2 branches in two branch roads up and down, as shown in Figure 8.2 inputs of each secondary rectifier (output rectifier) after being in series with a balancing capacitance Cbi (i refers to i module), at least one common mode inductance winding, form 2 new inputs, are parallel to 2 output ports of resonant network.Secondary rectifier (output rectifier), balancing capacitance Cb and the common mode inductance winding of being connected are formed an output module.With output module among Figure 11 1 is example, and 2 input a2 of original secondary rectifier (output rectifier) and b2 form 2 new input a2 ' and b2 ' through balancing capacitance Cb1 and common mode inductance CM1.Be connected in parallel on 2 output ports of resonant network.2 input ports of resonant network are consistent with former embodiment, are connected on output port A, the B of former limit topology.Each output module and adjacent output module intercouple by common mode inductance, as output module 1 and output module 2 couplings; Output module 2 need be coupled with output module 1 and module 3.Can realize the current balance between a plurality of output modules.Seal in a balancing capacitance Cbi (i is a natural number) in each output module,, connect, do not influence the resonance of circuit, can be used for 2 output currents in balanced each output module with resonant capacitance because the appearance value is bigger.So just realized the current balance between all outputs.
When output voltage and input voltage differed big, owing to there is not the no-load voltage ratio effect of transformer, several times of ability frequency need being brought up to circuit resonant frequencies satisfied the requirement of output voltage.Too high frequency can cause serious switching loss and EMI problem, for further improve its efficient, the limit switch frequency is too high, among the embodiment as shown in Figure 8, can adopt control method shown in Figure 12.Promptly before frequency reaches the upper limit, regulate output by by-pass cock frequency (frequency modulation work); After reaching the upper limit, regulate output by the discontinuous operation pattern, this moment, the switching frequency relative fixed was in upper frequency limit.
Feedback signal shown in Figure 12 can be based on any signal of telecommunication that needs control of system requirements, as output current, output voltage etc.Relatively reach feedback compensation link (as PI or PID etc.) by feedback signal and reference signal and produce a control signal.Control each switch in the topology of former limit based on control signal, make feedback signal and benchmark be consistent.In the embodiment shown in fig. 12, control signal is more little, switching frequency is high more, a plurality of switches of former limit topology present 50% complementary switch, produce a duty ratio and be about square wave about 50% (in the side circuit, because switch is imperfect on the output terminals A B of former limit topology, need Dead Time etc., deviation slightly, but to those skilled in the art, this is a common practise).When reaching lower limit BST1 formula, frequency reaches the upper limit, and circuit enters gap mode of operation (BURST mode of operation).When continuing to be reduced to lower limit BST2 as control signal, the output of BURST control signal is low, and the driving of switch is closed, and input no longer transmits energy to output.Along with the reduction of intake, control signal continues to raise, when it meets upper limit BST1, the BURST control signal is high, and switch is task again, and input transmits energy to output, at the square wave of output duty cycle about 50% intermittently on the AB, this moment, switching frequency was limited near the Flimit.
Should be pointed out that the thought of only controlling for explanation embodiment illustrated in fig. 12, is not unique or exhaustive.It will be apparent to those skilled in the art that to have other different execution mode to reach same effect, and as (the high more switching frequency of control signal are high more) such as polarity of change control voltage, but these are all without prejudice to flesh and blood of the present invention.
Figure 13 shows that the present invention is another embodiment and the control method thereof that solves under the big situation of input and output voltage difference.Compare with Fig. 8, increased the prime DC/DC current transformer 300 of an input.Based on feedback, by the output voltage (promptly regulating the input voltage of former limit topology) of prime current transformer, each switch is operated in 50% duty ratio in the topology of former limit, and frequency can or be fixed a determined value a scope inner conversion of optimizing.Prime current transformer 300 generally is the DC/DC current transformer of non-isolation, as non-isolation type circuit well known in the art such as BUCK, BOOST, BUCK-BOOST, SEPIC or ZETA, is not described in detail here.Among the embodiment of Figure 12, output voltage can less than, also can depend on the output voltage of DC/DC current transformer 300 greater than input voltage.The input voltage that it should be noted that prime DC/DC current transformer 300 can have bigger Wen Bo, as the half-sinusoid signal.
Generally speaking, no matter above how detailed explanation is, can have many modes to implement the present invention in addition, the just specific embodiments of the invention described in the specification.All equivalent transformations that spirit is done according to the present invention or modification all should be encompassed within protection scope of the present invention.
The above-mentioned detailed description of the embodiment of the invention be not exhaustive or be used to limit the present invention to above-mentioned clear and definite in form.Above-mentioned with schematic purpose specific embodiment of the present invention and example are described in, those skilled in the art will recognize that and can carry out various equivalent modifications within the scope of the invention.
The present invention's enlightenment provided here is not must be applied in the said system, can also be applied in other system.Element and the effect of above-mentioned various embodiment can be combined so that more embodiment to be provided.
Can make amendment to the present invention according to above-mentioned detailed description, at above-mentioned declarative description specific embodiment of the present invention and having described in the anticipated optimal set pattern, no matter how detailed explanation appearred hereinbefore, also can be implemented in numerous ways the present invention.The details of foregoing circuit structure and control mode thereof is carried out in the details at it can carry out considerable variation, yet it still is included among the present invention disclosed herein.
Should be noted that as above-mentioned that employed specific term should not be used to be illustrated in when explanation some feature of the present invention or scheme redefines this term here with restriction of the present invention some certain features, feature or the scheme relevant with this term.In a word, should be with the terminological interpretation in the claims of enclosing, used for not limiting the invention to disclosed specific embodiment in the specification, unless above-mentioned detailed description part defines these terms clearly.Therefore, actual range of the present invention not only comprises the disclosed embodiments, also is included in to implement or carry out all equivalents of the present invention under claims.
The formal description that requires with some specific rights some scheme of the present invention the time, the inventor has thought over many claim forms of the various schemes of the present invention below.Therefore, the inventor increases the right of accessory claim after being retained in submit applications, thereby relates other scheme of the present invention with the form of these accessory claims.
Claims (10)
1. electric capacity isolated form multiple constant current export resonance formula DC/DC converter comprises:
The direct current input;
Former limit topology comprises a plurality of switches, with described direct current input coupling, has 2 outputs, converts described direct current input to an AC signal at output port;
Resonant network receives described AC signal, and it is outputed to the secondary rectifier;
The secondary rectifier has 2 inputs, is coupled with described resonant network; And have 2 outputs, to drive 2 tunnel loads;
Described resonant network comprises 2 resonance branch roads, and each resonance branch road is in series by 1 resonant capacitance and 1 resonant inductance, and each resonance branch road is connected between the input of output of described former limit topology and secondary rectifier.
2. the current transformer shown in claim 1 is characterized in that, also comprises 1 common mode inductance in the described resonant network.
3. electric capacity isolated form multiple constant current export resonance formula DC/DC converter comprises:
The direct current input;
Former limit topology comprises a plurality of switches, with described direct current input coupling, has 2 outputs, converts described direct current input to an AC signal at output port;
N resonant network parallel with one another receives described AC signal, and it outputed to each self-corresponding output module;
N output module comprises a secondary rectifier separately; Described secondary rectifier has 2 inputs, is coupled respectively with a described n resonant network, and has 2 outputs to drive 2 tunnel loads;
Each resonant network includes 2 resonance branch roads, and each resonance branch road is in series by 1 resonant capacitance and 1 resonant inductance, and each resonance branch road is connected between the input of output of described former limit topology and secondary rectifier.
4. the current transformer shown in claim 3 is characterized in that, in the described n output module, coupling in twos realizes the current balance between a plurality of outputs between the adjacent resonant inductance of two groups of adjacent output modules.
5. electric capacity isolated form multiple constant current export resonance formula DC/DC converter comprises:
A former limit topology comprises a plurality of switches, with direct current input coupling, has 2 outputs, converts described direct current input to an AC signal at output port;
At least 2 output modules, each output module comprise the winding of a balancing capacitance, a secondary rectifier and at least one common mode inductance separately; Described secondary rectifier has 2 inputs, after described balancing capacitance and described common mode windings in series, is connected to a resonant network; The secondary rectifier also has 2 outputs to drive 2 tunnel loads;
A resonant network comprises 2 resonant capacitances and at least 1 resonant inductance, receives described AC signal, and it is outputed to each output module;
In two groups of adjacent output modules, the winding of described common mode inductance intercouples, and realizes the current balance between a plurality of outputs.
As claim 1 to 5 every in any one current transformer, it is characterized in that described former limit topology is symmetrical half bridge topology, full-bridge topology or asymmetrical half-bridge topology.
As claim 1 to 5 every in any one current transformer, it is characterized in that described resonant capacitance is a safety electric capacity, realize that input and output isolate.
As claim 1 to 5 every in any one current transformer, it is characterized in that described secondary rectifier is dual output full bridge structure or dual output multiplication of voltage structure.
As claim 1 to 5 every in any one current transformer, it is characterized in that described former limit topology is output as the AC signal of a duty ratio 50%; During less than a set point, the duty ratio of switch is 50% to a plurality of switches at switching frequency in the topological structure of former limit; When switching frequency is higher than a set point, work in the discontinuous operation pattern.
As claim 1 to 5 every in any one current transformer, it is characterized in that described DC input voitage is regulated based on feedback signal.
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