CN203674977U - Multiphase dc-dc converter - Google Patents
Multiphase dc-dc converter Download PDFInfo
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- CN203674977U CN203674977U CN201420031852.2U CN201420031852U CN203674977U CN 203674977 U CN203674977 U CN 203674977U CN 201420031852 U CN201420031852 U CN 201420031852U CN 203674977 U CN203674977 U CN 203674977U
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Abstract
The utility model discloses a multiphase DC-DC converter including an input end for receiving DC input voltage, a plurality of parallelly connected single-phase DC-DC converters for performing DC-DC conversion on DC input voltage, an output end for outputting the DC output voltage converted by the plurality of single-phase DC-DC converters, and an equalization circuit which is serially connected with the plurality of parallelly connected single-phase DC-DC converters between the input end and the output end of the multiphase DC-DC converter and is used for equalizing the current of the single-phase DC-DC converters.
Description
Technical field
The utility model relates generally to converter field, more specifically, relates to a kind of DC-DC converter with heterogeneous framework.
Background technology
Statement in this part only provides the background information relevant to the disclosure, and can not form prior art.
Known have various types of DC-to-DC (DC-DC) converter.For example, known have a multiphase DC-DC converter, and it adopts two or more independently single-phase DC-DC converters being connected in parallel.For example, in the multiphase DC-DC converter of two single-phase DC-DC converters of employing, the output current of described two single-phase DC-DC converters offsets 90 ° in phase place.This makes at the output generation current of multiphase DC-DC converter overlapping (overlapping current), thereby reduces the ripple current in output capacitor.In addition, the acceptable electric current that resonant component must mate to realize between two single-phase invertors is well shared.Otherwise the ripple current in output capacitor will be higher.Therefore, need to improve existing multiphase DC-DC converter.
Utility model content
In view of the above situation of prior art, an object of the present utility model is to provide a kind of equalizing circuit and improves multiphase DC-DC converter, and its acceptable electric current that at least can realize between the multiple single-phase invertors in multiphase DC-DC converter is shared.
According to an aspect of the present utility model, a kind of multiphase DC-DC converter is provided, comprising: input, for receiving DC input voitage; The multiple single-phase DC-DC converter being connected in parallel, for carrying out DC-DC conversion by described DC input voitage; Output, for exporting the VD through described multiple single-phase DC-DC converter conversion; And equalizing circuit, and the described multiple single-phase DC-DC converter being connected in parallel is connected in series between described input and described output, for the electric current of the described multiple single-phase DC-DC converters of equilibrium.
According on the other hand of the present utility model, described multiphase DC-DC converter can also comprise drive circuit, be used for driving described multiple single-phase DC-DC converter, there is each other predetermined phase shift with the phase place of the output current that makes described multiple single-phase DC-DC converters.
According on the other hand of the present utility model, wherein, described equalizing circuit is made up of differential mode inductance.
According on the other hand of the present utility model, wherein, the output of described multiphase DC-DC converter can comprise the first output and the second output, the first coil of described differential mode inductance is connected in series between first common output and described the first output of described multiple single-phase DC-DC converters, and the second coil of described differential mode inductance is connected in series between second common output and described the second output of described multiple single-phase DC-DC converters.
According on the other hand of the present utility model, wherein, the input of described multiphase DC-DC converter can comprise first input end and the second input, the first coil of described differential mode inductance is connected in series between described first input end and the first shared input of described multiple single-phase DC-DC converters, and the second coil of described differential mode inductance is connected in series between described the second input and the second shared input of described multiple single-phase DC-DC converters.
According on the other hand of the present utility model, equalizing circuit can be made up of differential mode inductance.Wherein, the output of described multiphase DC-DC converter comprises the first output and the second output, the first coil of described differential mode inductance is connected in series between first common output and described the first output of described multiple single-phase DC-DC converters, and the second coil of described differential mode inductance is connected in series between second common output and described the second output of described multiple single-phase DC-DC converters.
According on the other hand of the present utility model, wherein, each can the comprising in described multiple single-phase DC-DC transformers: main transformer, for described DC input voitage is carried out to transformation; Switch element, comprise multiple switch elements, be arranged between the input of described single-phase DC-DC converter and the primary side of described main transformer, for operating by turning on and off of described multiple switch elements the primary side that described DC input voitage is provided to described main transformer; And rectifier, be connected between the primary side of described main transformer and the output of described single-phase DC-DC converter, voltage for the primary side output to described main transformer carries out rectification, to export described VD, wherein, described rectifier is full-bridge rectifier or half bridge rectifier.
According on the other hand of the present utility model, wherein, described rectifier can be half bridge rectifier, and the half bridge rectifier of described multiple single-phase DC-DC transformers can have shared capacitor brachium pontis.
According on the other hand of the present utility model, wherein, described rectifier can be half bridge rectifier, and described equalizing circuit can be connected between the diode brachium pontis and capacitor brachium pontis of described half bridge rectifier.
According on the other hand of the present utility model, wherein, described switch element can comprise the two or four switch element that bridge-type connects.
According on the other hand of the present utility model, described multiphase DC-DC converter can also comprise at least one filtering capacitor being connected in parallel between described multiple single-phase DC-DC converters and described equalizing circuit and described output, for the ripple of the output voltage of multiple single-phase DC-DC converters described in filtering.
According on the other hand of the present utility model, wherein, in each single-phase DC-DC converter, in described switch element, the driving signal of each switch element can have about 50% duty ratio, and between the driving signal of the first switch element in described switch element and the driving signal of second switch element, can there is the phase shift of 180 degree, described the first switch element makes the primary side coil of described main transformer by the input current of first direction in the time of conducting, and described second switch element makes the primary side coil of described main transformer by the input current of the second direction contrary with first direction in the time of conducting.
According on the other hand of the present utility model, wherein, described predetermined phase shift can be 180 °/n, and n is the number of described multiple single-phase DC-DC converters.
According in the multiphase DC-DC converter aspect more than of the present utility model, equalizing circuit and the multiple single-phase DC-DC converter being connected in parallel are connected in series between the input and output of multiphase DC-DC converter, the electric current of the multiple single-phase DC-DC converter in can balanced multiphase DC-DC converter, reduce the difference between input current or the output current of multiple single-phase DC-DC converters, thereby the acceptable electric current of realizing between the multiple single-phase invertors in multiphase DC-DC converter is shared.
Brief description of the drawings
The utility model can, by reference to hereinafter given description and being better understood by reference to the accompanying drawings, wherein use same or analogous Reference numeral to represent identical or similar parts in institute's drawings attached.Described accompanying drawing comprises in this manual and forms the part of this specification together with detailed description below, and is used for further illustrating preferred embodiment of the present utility model and explains principle and advantage of the present utility model.In the accompanying drawings:
Fig. 1 illustrates according to the schematic block diagram of the multiphase DC-DC converter of the first embodiment of the present utility model;
Fig. 2 A and 2B illustrate the exemplary circuit diagram according to the equalizing circuit in the multiphase DC-DC converter of the first embodiment of the present utility model;
Fig. 3 illustrates the exemplary circuit diagram according to the multiphase DC-DC converter of the first embodiment of the present utility model;
Fig. 4-5 illustrate the electric current of multiphase DC-DC converter and the example waveform figure of voltage of Fig. 3;
Fig. 6 illustrates another exemplary circuit diagram according to the multiphase DC-DC converter of the first embodiment of the present utility model;
Fig. 7 illustrates the another exemplary circuit diagram according to the multiphase DC-DC converter of the first embodiment of the present utility model;
Fig. 8 illustrates another exemplary circuit diagram according to the multiphase DC-DC converter of the first embodiment of the present utility model;
Fig. 9 illustrates another exemplary circuit diagram according to the multiphase DC-DC converter of the first embodiment of the present utility model;
Figure 10 illustrates according to the schematic block diagram of the multiphase DC-DC converter of the second embodiment of the present utility model;
Figure 11 A and 11B illustrate the exemplary circuit diagram according to the equalizing circuit in the multiphase DC-DC converter of the second embodiment of the present utility model;
Figure 12 illustrates the exemplary circuit diagram according to the multiphase DC-DC converter of the second embodiment of the present utility model;
Figure 13 illustrates another exemplary circuit diagram according to the multiphase DC-DC converter of the second embodiment of the present utility model;
Figure 14 illustrates another exemplary circuit diagram according to the equalizing circuit in the multiphase DC-DC converter of the second embodiment of the present utility model; And
Figure 15 illustrates another exemplary circuit diagram according to the multiphase DC-DC converter of the second embodiment of the present utility model.
Embodiment
Embodiment of the present utility model is described below with reference to accompanying drawings.The element of describing in an accompanying drawing of the present utility model or a kind of execution mode and feature can combine with element and feature shown in one or more other accompanying drawing or execution mode.It should be noted that for purposes of clarity, in accompanying drawing and explanation, omitted with the utility model irrelevant, expression and the description of parts known to persons of ordinary skill in the art and processing.
In embodiment of the present utility model, utilize the electric current that is connected in series in the balanced multiple single-phase DC-DC converters of equalizing circuit between input and the output of multiphase DC-DC converter with the multiple single-phase DC-DC converter being connected in parallel, reduce the difference between the electric current of multiple single-phase DC-DC converters, thereby the acceptable electric current of realizing between the multiple single-phase invertors in multiphase DC-DC converter is shared.As example instead of restriction, equalizing circuit can be arranged between the multiple single-phase DC-DC converter and the input of multiphase DC-DC converter being connected in parallel, for the input current of the multiple single-phase DC-DC converters of equilibrium; Or, also can be arranged between the multiple single-phase DC-DC converter and the output of multiphase DC-DC converter being connected in parallel, for the output current of the multiple single-phase DC-DC converters of equilibrium.
In embodiment of the present utility model, for the purpose of difference, multiphase DC-DC converter also can be called multi-phase DC-DC transformation system, and the multiple single-phase DC-DC converter in multiphase DC-DC converter also can be called for short DC-DC converter.
Fig. 1 illustrates according to the schematic block diagram of the multiphase DC-DC converter of the first embodiment of the present utility model.In the first embodiment of the present utility model, equalizing circuit is arranged between the multiple single-phase DC-DC converter and the output of multiphase DC-DC converter being connected in parallel, for the output current of the multiple single-phase DC-DC converters of equilibrium.As shown in Figure 1, multiphase DC-DC converter 100 comprises: input (131,132), for receiving DC input voitage Vin; The multiple single-phase DC-DC converter that is connected in parallel (111,112 ..., 11n), for DC input voitage Vin is carried out to DC-DC conversion, wherein n is greater than 1 positive integer; Output (133,134), for exporting the VD Vout through multiple single-phase DC-DC converter conversion; And equalizing circuit (120), with the multiple single-phase DC-DC converter (111 being connected in parallel, 112 ..., 11n) be connected in series, and be arranged on multiple single-phase DC-DC converters (111,112 ..., 11n) and output (133,134) between, for the output current of the described multiple single-phase DC-DC converters of equilibrium.
Input (131,132) generally includes first input end and the second input, connects respectively earth potential and high potential above Ground, and described high potential and earthy difference are the values of input voltage vin.Similarly, output (133,134) generally includes the first output and the second output, connects respectively earth potential and high potential above Ground, and described high potential and earthy difference are the values of output voltage V out.Below for convenience of explanation, input 131 is called to first input end, input 132 is called to the second input; Output 133 is called to the first output, output 134 is called to the second output.But should be understood that here and following " first " and " second " using is only in order to distinguish instead of in order to limit.
In the present embodiment, DC-DC converter (111,112 ..., 11n) and can adopt the single-phase DC-DC converter of various appropriate configuration to realize, as forward converter, bridge converter, push-pull converter etc., and not restriction.
In the present embodiment, can adopt the equalizing circuit of appropriate configuration to implement equalizing circuit 120.For example, can adopt differential mode inductance or the lc circuit that is made up of inductor and capacitor is implemented equalizing circuit 120.
In multiphase DC-DC converter 100, also comprise drive circuit (not shown), be used for driving described multiple single-phase DC-DC converter (111,112 ... 11n), there is each other predetermined phase shift with the phase place of the output current that makes described multiple single-phase DC-DC converters.Preferably, predetermined phase shift can be 180 °/n, and n is the number of described multiple single-phase DC-DC converters.Predetermined phase shift like this can be eliminated the ripple in the output current of multiphase DC-DC converter preferably, therefore can reduce or save the output capacitance in multiphase DC-DC converter.Here can adopt the drive circuit of any appropriate configuration.For not fuzzy the utility model, do not specifically describe the structure of drive circuit here and below.
Fig. 2 A illustrates the exemplary circuit diagram according to the equalizing circuit in the multiphase DC-DC converter of the first embodiment of the present utility model.In this example, multiphase DC-DC converter 200 adopts differential mode inductance 220 to implement equalizing circuit.As shown in Figure 2, the first coil of differential mode inductance 220 is connected in series in multiple single-phase DC-DC converters (211,212, between the first common output 243 21n) and the first output 233 of multiphase DC-DC converter, the second coil of differential mode inductance 220 is connected in series in multiple single-phase DC-DC converters (211,212,, 21n) the second common output 244 and the second output 234 of multiphase DC-DC converter between.The first common output 243 and the second common output 244 are connected respectively the Same Name of Ends of a coil and the non-same polarity of another coil of differential mode inductance 220.Like this, make to flow into sense of current in two coils of differential mode inductance contrary, the magnetic flux that the initial current in each coil produces in another coil, induce with this another coil in the induced current of initial current opposite direction.Thus, reduced the difference of the electric current that two coil midstreams cross, thus reduced multiple single-phase DC-DC converters (211,212 ..., 21n) the difference of output current.
In this example, the Same Name of Ends of two of differential mode inductance coils (being represented by the stain in figure) is in a side.In other examples, the Same Name of Ends of two coils of differential mode inductance also can be in relative both sides, and the first common output 243 and the second common output 244 still can be connected respectively the Same Name of Ends of a coil and the non-same polarity of another coil of differential mode inductance 220, as shown in Figure 2 B.
In the disclosure, differential mode inductance is the definition in function, and differential mode voltage current signal is played to inhibitory action, can be with Same Name of Ends in its structure at a side or Same Name of Ends at not common mode or the differential mode inductance of homonymy.
Fig. 3 illustrates the exemplary circuit diagram according to the multiphase DC-DC converter of the first embodiment of the present utility model.As shown in Figure 3, multiphase DC-DC converter 300 comprises two single-phase DC- DC converters 311 and 312 that are connected in parallel.DC-DC converter 311 illustrates by the dotted line frame in figure, and DC-DC converter 312 is illustrated by the double dot dash line frame in figure.Equalizing circuit is realized by differential mode inductance T3.
DC-DC converter 311 comprises: main transformer T1, carries out transformation for the DC input voitage Vin being provided by DC power supply on the input at DC-DC converter 311 (331,332); Switch element, comprise multiple switch element (Q1, Q2), be arranged between the input of DC-DC converter 311 and the primary side of main transformer T1, for operating by turning on and off of described multiple switch elements the primary side that DC input voitage is provided to main transformer; And rectifier, be connected between the primary side of main transformer and the output of described DC-DC converter 311, carry out rectification for the voltage of the primary side output to main transformer, to export VD.
Switch Q1 in DC-DC converter 311 is connected with semibridge system with Q2, to form switch element.Q1 and Q2 are realized by metal oxide semiconductor field effect tube (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET) (abbreviation metal-oxide-semiconductor), and also can be realized by other switch elements in other examples.In the time that one of switch Q1 or Q2 are switched on, the primary coil of main transformer T1 is energized, and correspondingly encourages the secondary coil of T1.In the time that the secondary coil of T1 is energized, produce through the electric power of transformation, through the electric power of transformation subsequently by the rectifier rectification in DC-DC converter 312 and be delivered to the load I2 of the output (333,334) that is connected to multiphase DC-DC converter 300.
Capacitor C1, C2 in DC-DC converter 311 forms respectively the pith of resonant circuit with inductor L1 and T1.
In this example, the rectifier of DC-DC converter 311 is half bridge rectifier, is made up of switch D1, D3 and capacitor C5, C6.The wherein diode brachium pontis of switch D1, D3 composition half bridge rectifier, the capacitor brachium pontis of capacitor C5, C6 composition half bridge rectifier.Switch D1, D3 are realized by diode, and also can be realized by for example MOSFET of other switch elements in other examples.Switch element in rectifier can be various types of semiconductor switch devices such as diode, metal-oxide-semiconductor.In the time that " rectifier " is metal-oxide-semiconductor, can utilize drive circuit to provide driving signal for metal-oxide-semiconductor, so that the electric current of N metal-oxide-semiconductor only flows to drain electrode from source electrode.
DC-DC converter 312 has the structure identical with DC-DC converter 311, comprises the switch element being made up of switch Q3 and Q4, the main transformer of being realized by transformer T2, the half bridge rectifier being formed by switch D2, D4 and capacitor C7, C8, and comprise by.Capacitor C3, C4 respectively with the resonant circuit of L2 and T2 composition.The operation principle of DC-DC converter 312 is also identical with DC-DC converter 311, except the driving signal difference of the two, is not described in detail here.
Differential mode inductance T3 be connected in series in DC- DC converter 311 and 312 and the output of multiphase DC-DC converter 300 between, more specifically, be connected in series between the diode brachium pontis and capacitor brachium pontis of half bridge rectifier of DC-DC converter 311 and 312.Should be appreciated that in other examples, differential mode inductance T3 also can be connected in series between the common output of DC- DC converter 311 and 312 and the output of multiphase DC-DC converter 300.
Capacitor C20 in multiphase DC-DC converter 300 is connected in parallel between the input and DC- DC converter 311 and 312 of multiphase DC-DC converter 300, as the input capacitor of multiphase DC-DC converter 300, be used for energy storage to serve as power supply in soft start-up process, and filter the noise in DC input voitage.
Preferably, multiphase DC-DC converter 300 can also comprise filtering capacitor C9 and/or C10(or be called output capacitor), it is connected in parallel between the common output of DC- DC converter 311 and 312 and the output of multiphase DC-DC converter 300, can be respectively used to alternating current component and high fdrequency component in the output current of filtering DC-DC converter, thus the ripple in the output voltage of filtering multiphase DC-DC converter 300.Although two filtering capacitor C9 shown in Figure 3 and C10, in actual applications, can use the filtering capacitor of arbitrary number as required.
In addition, preferably, in each single-phase DC-DC converter, in switch element, the driving signal (for example being provided by drive circuit) of each switch element has about 50%(and is preferably less than 50%) duty ratio, and between the driving signal of the first switch element in switch element and the driving signal of second switch element, there is the phase shift of 180 degree.Here, the first switch element refers to the primary side coil that makes main transformer in the time of conducting by the switch element of the input current of first direction, and second switch element refers to and in the time of conducting, makes the primary side coil of main transformer by the switch element of the input current of the second direction contrary with first direction.For example, in single-phase DC-DC converter 311, switch element Q1(the first switch element) for example make the primary side coil of main transformer T1 when conducting, by the input current of first direction (downward), switch element Q2(second switch element) make the primary side coil of T1 for example, by the input current of second direction (downward) when conducting.The driving signal of switch element Q1 and Q2 all has about 50% duty ratio, and between the driving signal of Q1 and Q2, has the phase shift of 180 degree.Thus, can realize preferably zero voltage switch (Zero Voltage Switching, ZVS) pattern (also claiming soft switching mode).
In addition, although in Fig. 3 and following exemplary circuit, the primary side of main transformer and primary side have been used identical ground connection symbol, should be appreciated that in actual applications, and the ground that the ground that the primary side of main transformer connects and primary side connect isolates.The circuit of the primary side of main transformer uses common ground in addition, and the circuit of the primary side of main transformer uses common ground.
In multiphase DC-DC converter, resonant inductor L1, the L2 in resonant circuit can be the physics inductor existing as entity, can be also stray inductance.In high voltage output application, the transformation ratio of the main transformer of multiphase DC-DC converter will be reduced to and even be less than 1, therefore can not easily set up leakage inductance as resonant inductance.In the exemplary circuit of Fig. 3, rectifier in DC-DC converter is half bridge rectifier, can make the primary side output voltage step-down of main transformer reach approximately 1/2, therefore can make the transformation ratio (being turn ratio) of main transformer increase to about 2:1, thereby can set up enough leakage inductances (or being called stray inductance) as resonant inductance in the primary side of main transformer.Therefore can utilize the stray inductance of main transformer as resonant inductance L1 and L2, and needn't use physics inductor, thereby increasing power density is to raise the efficiency and to save component costs.
In addition, the use of semibridge system structure can also reduce the use of semiconductor device in circuit.
Fig. 4 illustrates the example voltages oscillogram that is offered respectively the driving signal of for example, the first switch element in the switch element of the single-phase DC-DC converter (DC-DC converter 311) in multiphase DC-DC converter 300 and second switch element (for example Q1, Q2) by drive circuit.Two drive the frequency of operation of signal 401 and 402 to fix, and phase deviation is 180 °, and frequency is substantially equal to resonant capacitance (C1 and C2) and the determined resonance frequency of resonant inductance (L1).Certainly, main transformer parasitic capacitance C5 and C6 will affect resonance frequency.The duty ratio of these switching drive signals is about 50%(and is preferably not more than 50%), regulate the magnetizing inductance of Dead Time and main transformer to enter ZVS pattern to guarantee switch (Q1, Q2, Q3, Q4) at Dead Time.
Fig. 5 illustrates the electric current of multiphase DC-DC converter 300 and the example waveform figure of voltage.Waveform 501 represents to offer the switching drive signal Vgs of the switch element (for example metal-oxide-semiconductor Q2) in the switch element of DC-DC converter 311; Waveform 502 represents the drain-source voltage Vds of this switch element (for example Q2) of DC-DC converter 311; Waveform 503 represents the input current of the main transformer of DC-DC converter 311.Can find out the input current near sinusoidal ripple of the main transformer of DC-DC converter 311.DC-DC converter 312 also has similar electric current and voltage waveform, just 90 ° of phase deviations compared with the waveform of DC-DC converter 311.Make the electric current of two DC-DC converters and the waveform of voltage there is the phase shift of 90 °, can eliminate preferably the ripple in output current, therefore can reduce shared output capacitance C9 and C10 value or the number of DC- DC converter 311 and 312, to save element.
Fig. 6 illustrates another exemplary circuit diagram according to the multiphase DC-DC converter of the first embodiment of the present utility model.As shown in Figure 6, multiphase DC-DC converter 600 comprises two single-phase DC-DC converters 611 and 612 that are connected in parallel.DC-DC converter 611 illustrates by the dotted line frame in figure, and DC-DC converter 612 is illustrated by the double dot dash line frame in figure.Equalizing circuit is realized by differential mode inductance T3.Differential mode inductance T3 is connected in series in the common output of DC-DC converter 611 and 612 and the output of multiphase DC-DC converter 300, is specifically connected in series between the diode brachium pontis and capacitor brachium pontis of half bridge rectifier of DC-DC converter 611 and 612.Compared with the exemplary circuit of Fig. 3, four switch elements (Q1, Q2, Q31, Q32) that the DC-DC converter 611 in Fig. 6 is connected by full-bridge type respectively with 612 switch element and (Q3, Q4, Q33, Q34) composition.In addition, resonant circuit in Fig. 6 is respectively by (C25, L1, and (C26, L2 T1), T2) composition, wherein capacitor 25 and inductor L1 are connected in series between an output (output between Q31 and Q32) and the primary side of main transformer T1 of switch element of DC-DC converter 611, and capacitor 26 and inductor L2 are connected in series between an output (output between Q33 and Q34) and the primary side of main transformer T2 of switch element of DC-DC converter 612.Multiphase DC-DC converter 600, by using the switch element of full-bridge type, can provide larger input power.
Similar with the circuit in Fig. 3, in the circuit of Fig. 6, preferably, in switch element, the driving signal (for example being provided by drive circuit) of each switch element can have about 50%(and is preferably less than 50%) duty ratio, and between the driving signal of the first switch element in switch element and the driving signal of second switch element, can there is the phase shift of 180 degree, to realize preferably ZVS pattern.In Fig. 6, for example, in single-phase DC-DC converter 631, the primary side coil that switch element Q1 and Q32 make main transformer T1 is for example, by the input current of first direction (downward), and switch element Q2 and Q31 make the primary side coil of main transformer T1 for example, by the second direction contrary with the first direction input current of (upwards).Therefore, switch element (Q1, Q32) the driving signal of (the first switch element) and switch element (Q2, Q32) between the driving signal of (second switch element), can there is the phase shift of 180 degree, and each switch element (Q1, Q2, Q31, Q32) the duty ratio of driving signal be about 50%.
Fig. 7 illustrates the another exemplary circuit diagram according to the multiphase DC-DC converter of the first embodiment of the present utility model.As shown in Figure 7, multiphase DC-DC converter 700 comprises two single-phase DC-DC converters 711 and 712 that are connected in parallel.DC-DC converter 711 illustrates by the dotted line frame in figure, and DC-DC converter 712 is illustrated by the double dot dash line frame in figure.Equalizing circuit is realized by differential mode inductance T3.Differential mode inductance T3 is connected in series between the common output of DC-DC converter 711 and 712 and the output of multiphase DC-DC converter 700.Compared with the exemplary circuit of Fig. 3, the DC-DC converter 711 and 712 in Fig. 6 all adopts full-bridge rectifier.Particularly, four switch (as directed diodes that the rectifier of DC-DC converter 711 is connected by full-bridge type, also can be other switch elements) D1, D3, D5, D6 composition, four switches (as directed diode can be also other switch elements) D2, D4, D7, D8 composition that the rectifier of DC-DC converter 712 is connected by full-bridge type.In addition, as example instead of restriction, in Fig. 7, provide DC input voitage by the storage battery being connected in series to multiphase DC-DC converter 700.In the situation that using full-bridge rectifier, resonant inductor L1 and L2 are physics inductors.By using full-bridge rectifier, make the output of main transformer that larger power can be provided, thereby make multiphase DC-DC converter 700 that higher power output can be provided.
Fig. 8 illustrates another exemplary circuit diagram according to the multiphase DC-DC converter of the first embodiment of the present utility model.As shown in Figure 8, multiphase DC-DC converter 800 comprises two single-phase DC- DC converters 811 and 812 that are connected in parallel.DC-DC converter 811 illustrates by the dotted line frame in figure and dot-dash wire frame, and DC-DC converter 812 is illustrated by the double dot dash line frame in figure and dot-dash wire frame.Equalizing circuit is realized by differential mode inductance T3.Compared with the exemplary circuit of Fig. 3, the DC- DC converter 811 and 812 in multiphase DC-DC converter 800 has shared capacitor brachium pontis.This shared capacitor brachium pontis is made up of capacitor C54, C55, in Fig. 8, is illustrated by dot-dash wire frame.Differential mode inductance T3 is connected in series in the common output of DC- DC converter 811 and 812 and the output of multiphase DC-DC converter 300, and the diode brachium pontis that is specifically connected in series in the half bridge rectifier of DC- DC converter 811 and 812 is used between capacitor brachium pontis together.By making multiple single-phase DC-DC converters (811,812) there is shared capacitor brachium pontis, can save component costs.
Fig. 9 illustrates another exemplary circuit diagram according to the multiphase DC-DC converter of the first embodiment of the present utility model.Compared with the exemplary circuit of Fig. 3, the multiphase DC-DC converter 900 shown in Fig. 9 comprises three DC-DC converters that are connected in parallel 911,912 and 913.DC-DC converter 911 illustrates by the dotted line frame in figure, and DC-DC converter 912 illustrates by the double dot dash line frame in figure, and DC-DC converter 913 is illustrated by the dot-dash wire frame in figure.Equalizing circuit is realized by differential mode inductance T3.Differential mode inductance T3 is connected in series between the common output of DC-DC converter 911,912 and 913 and the output of multiphase DC-DC converter 900, is specifically connected in series between the diode brachium pontis and capacitor brachium pontis of half bridge rectifier of DC-DC converter 911,912 and 913.DC-DC converter 911,912 is identical with 913 circuit structure, and identical with the circuit structure of the DC-DC converter 311 shown in Fig. 3, is not repeated in this description here.Should be appreciated that DC-DC converter 911,912 and 913 also can have the circuit structure different from DC-DC converter 311, and/or the circuit structure of DC-DC converter 911,912 and 913 also can differ from one another, not be described in detail here.
Except the structure of above exemplary circuit, the switch element of each single-phase DC-DC converter and rectifier can be full-bridge type structure, are not described in detail here.
More than show the exemplary circuit that equalizing circuit is positioned at the outlet side of multiphase DC-DC converter.Equalizing circuit described be positioned at the situation of the input side of multiphase DC-DC converter below with reference to accompanying drawing.
Figure 10 illustrates according to the schematic block diagram of the multiphase DC-DC converter of the second embodiment of the present utility model.In the second embodiment of the present utility model, equalizing circuit is arranged between the multiple single-phase DC-DC converter and the input of multiphase DC-DC converter being connected in parallel, for the input current of the multiple single-phase DC-DC converters of equilibrium.As shown in figure 10, multiphase DC-DC converter 1000 comprises: input (1031,1032), for receiving DC input voitage Vin; The multiple single-phase DC-DC converter that is connected in parallel (1011,1012 ..., 101n), for DC input voitage Vin is carried out to DC-DC conversion, wherein n is greater than 1 positive integer; Output (1033,1034), for exporting the VD Vout through multiple single-phase DC-DC converter conversion; And equalizing circuit (1020), with the multiple single-phase DC-DC converter (1011 being connected in parallel, 1012 ..., 101n) be connected in series, and be arranged on multiple single-phase DC-DC converters (1011,1012 ..., 101n) and input (1031,1032) between, for the input current of the described multiple single-phase DC-DC converters of equilibrium.
In the present embodiment, DC-DC converter (111,112 ..., 11n) and can adopt the single-phase DC-DC converter of various appropriate configuration to realize, as forward converter, bridge converter, push-pull converter etc., and not restriction.
In the present embodiment, can adopt the equalizing circuit of appropriate configuration to implement equalizing circuit 1020.For example, can adopt differential mode inductance or lc circuit to implement equalizing circuit 1020.
In multiphase DC-DC converter 1000, also comprise drive circuit (not shown), be used for driving described multiple single-phase DC-DC converter (1011,1012 ... 101n), there is each other predetermined phase shift with the phase place of the output current that makes described multiple single-phase DC-DC converters.Here can adopt the drive circuit of any appropriate configuration.Because drive circuit not solves the necessary parts of technical problem of the present utility model, for not fuzzy the utility model, do not specifically describe drive circuit here and below.
Figure 11 A illustrates the exemplary circuit diagram according to the equalizing circuit in the multiphase DC-DC converter of the second embodiment of the present utility model.In this example, multiphase DC-DC converter 1100 adopts differential mode inductance 1120 to implement equalizing circuit.As shown in figure 11, the first coil of differential mode inductance 1120 is connected in series in multiple single-phase DC-DC converters (1111,1112, between the first shared input 1141 and the first input end 1131 of multiphase DC-DC converter 111n), the second coil of differential mode inductance 1120 is connected in series in multiple single-phase DC-DC converters (1111,1112,, 111n) the second shared input 1142 and the second input 1132 of multiphase DC-DC converter between.First input end 1131 and the second input 1132 are connected respectively the Same Name of Ends of a coil and the non-same polarity of another coil of differential mode inductance 1120.Like this, make the sense of current of two coils that flow into differential mode inductance contrary, the magnetic flux that initial current in each coil produces in another coil, induce with this another coil in the induced current of initial current opposite direction.Thus, reduced the difference of the electric current that two coil midstreams cross, thus reduced multiple single-phase DC-DC converters (1111,1112 ..., 111n) the difference of input current.
In this example, the Same Name of Ends of two of differential mode inductance coils (being represented by the stain in figure) is in a side.In other examples, the Same Name of Ends of two coils of differential mode inductance also can be in relative both sides, and first input end 1131 and the second input 1132 still can be connected respectively the Same Name of Ends of a coil and the non-same polarity of another coil of differential mode inductance 1120, as shown in Figure 11 B.
Figure 12 illustrates the exemplary circuit diagram according to the multiphase DC-DC converter of the second embodiment of the present utility model.As shown in figure 12, multiphase DC-DC converter 1200 comprises two single-phase DC- DC converters 1211 and 1212 that are connected in parallel.DC-DC converter 1211 illustrates by the dotted line frame in figure, and DC-DC converter 1212 is illustrated by the double dot dash line frame in figure.Equalizing circuit is realized by differential mode inductance T4.DC-DC converter 1211 is identical with the structure of the DC- DC converter 711 and 712 shown in Fig. 7 respectively with 1212 structure, no longer repeats here.
Differential mode inductance T4 be connected in series in DC- DC converter 1211 and 1212 and the input of multiphase DC-DC converter 1200 between, more specifically, be connected in series in the shared input (1241 of DC- DC converter 1211 and 1212,1242) with the input (1231,1232) of multiphase DC-DC converter 1200 between.
Identical with shown in Fig. 7 of miscellaneous part in multiphase DC-DC converter 1200 and annexation, no longer repeats here.
Multiphase DC-DC converter 1200 shown in Figure 12, by using full-bridge rectifier, makes the output of main transformer that larger power can be provided, thereby higher power output can be provided.
Figure 13 illustrates another exemplary circuit diagram according to the multiphase DC-DC converter of the second embodiment of the present utility model.Compared with the exemplary circuit of Figure 12, the multiphase DC-DC converter 900 shown in Figure 13 comprises three DC-DC converters that are connected in parallel 1311,1312 and 1313.DC-DC converter 1311 illustrates by the dotted line frame in figure, and DC-DC converter 1312 illustrates by the double dot dash line frame in figure, and DC-DC converter 1313 is illustrated by the dot-dash wire frame in figure.Equalizing circuit is realized by differential mode inductance T4.Differential mode inductance T4 is connected in series between the shared input (1341,1342) of DC-DC converter 1311,1312 and 1313 and the input (1331,1332) of multiphase DC-DC converter 1300.DC-DC converter 1311,1312 is identical with 1313 circuit structure, and identical with the circuit structure of the DC-DC converter 311 shown in Fig. 3, is not repeated in this description here.Should be appreciated that DC-DC converter 1311,1312 and 1313 also can have the circuit structure different from DC-DC converter 311, and/or the circuit structure of DC-DC converter 1311,1312 and 1313 also can differ from one another, not be described in detail here.
In the example of Figure 12, the switch element of single-phase DC-DC converter has semibridge system structure, and rectifier has full-bridge type structure.In the example of Figure 13, the switch element of single-phase DC-DC converter and rectifier all have semibridge system structure.In other examples of the second embodiment of the present utility model, the switch element of each single-phase DC-DC converter and rectifier can be also respectively full-bridge type structure and semibridge system structure, or are full-bridge type structure; Or, can adopt other structures, be not described in detail here.
Figure 14 illustrates another exemplary circuit diagram according to the equalizing circuit in the multiphase DC-DC converter of the second embodiment of the present utility model.In this example, multiphase DC-DC converter 1400 adopts lc circuit to implement equalizing circuit 1420.As shown in figure 14, equalizing circuit 1420 comprises the inductor and the capacitor that are connected in series.One end being connected with this capacitor of this inductor be connected to multiple single-phase DC-DC converters (1411,1412 ..., 141n) the first shared input 1441, the other end of this inductor is connected to the first input end 1431 of multiphase DC-DC converter 1400.One end not being connected with this inductor of this capacitor be connected to the second input of multiphase DC-DC converter 1400 and be connected to multiple single-phase DC-DC converters (1411,1412 ..., 141n) the second shared input 1442.The equalizing circuit 1420 being made up of inductor and capacitor can change the impedance operator of single-phase DC-DC converter under operating frequency, play and the essentially identical effect of differential mode inductance, thereby reduce multiple single-phase DC-DC converters (1411,1412, the difference of input current 141n), realizes the current balance between multi-phase DC-DC.
Figure 15 illustrates the exemplary circuit diagram of the multiphase DC-DC converter shown in Figure 14.As shown in figure 15, multiphase DC-DC converter 1500 comprises two single-phase DC- DC converters 1511 and 1512 that are connected in parallel.DC-DC converter 1511 illustrates by the dotted line frame in figure, and DC-DC converter 1512 is illustrated by the double dot dash line frame in figure.DC-DC converter 1511 is identical with the structure of the DC- DC converter 311 and 312 shown in Fig. 3 respectively with 1512 structure, no longer repeats here.Equalizing circuit is realized by inductor L10 and capacitor C67.The inductor L10 being connected in series and capacitor C67 are connected to the input side of multiphase DC-DC converter 1500.One end that inductor L10 is connected with capacitor C67 is connected to the first shared input 1541 of DC- DC converter 1511 and 1512, and the other end of inductor L10 is connected to the first input end 1531 of multiphase DC-DC converter 1500.One end not being connected with inductor L10 of capacitor C67 is connected to the second input of multiphase DC-DC converter 1500 and is connected to the second shared input 1542 of DC- DC converter 1511 and 1512.
For further optimized circuit, multiphase DC-DC converter 150 can also comprise the resistor R13 and the capacitor C42 that are connected in parallel with inductor L10 and are connected in series to each other, plays filter action; And being connected in series in resistor R14 and the capacitor C43 between first input end 1531 and second input 1532 of multiphase DC-DC converter 150, C67 is connected in parallel with capacitor, plays filter action.
Identical with shown in Fig. 3 of miscellaneous part in multiphase DC-DC converter 1500 and annexation, no longer repeats here.
In the example of Figure 15, the switch element of each single-phase DC-DC converter and rectifier all have semibridge system structure.Be to be understood that, in other examples of equalizing circuit that use inductor and capacitor composition, the switch element of each single-phase DC-DC converter and rectifier can be respectively also full-bridge type structure and semibridge system structure, or semibridge system structure and full-bridge type structure, or are full-bridge type structure.Or, can adopt the single-phase DC-DC converter of other structures, be not described in detail here.
Describe according to the exemplary circuit of the multiphase DC-DC converter of the utility model embodiment as an example of bridge-type DC-DC converter example above.In other embodiment of the present utility model, can adopt the single-phase DC-DC converter of other appropriate configuration to realize the multiple single-phase DC-DC converter in multiphase DC-DC converter, as forward converter, push-pull converter etc., it is identical with connected mode described herein with the connected mode of equalizing circuit, describes no longer one by one.
In addition, in the exemplary circuit of Figure 15, the equalizing circuit being made up of inductor and capacitor is connected between the input of multiphase DC-DC converter and the shared input of multiple single-phase DC-DC converters.For example according in other examples of the first embodiment of the present utility model, the equalizing circuit being made up of inductor and capacitor also can be connected between the common output of multiple single-phase DC-DC converters and the output of multiphase DC-DC converter, is not described in detail here.
According to the multiphase DC-DC converter of embodiment of the present utility model, by equalizing circuit and the multiple single-phase DC-DC converter that is connected in parallel are connected in series between the input and output of multiphase DC-DC converter, electric current that can balanced multiple single-phase DC-DC converters, reduces the difference between input current or the output current of multiple single-phase DC-DC converters.According in some examples of embodiment of the present utility model, multiple single-phase DC-DC converter in multiphase DC-DC converter can use the rectifier with half-bridge structure, make to utilize the stray inductance reflecting from the primary side of main transformer as resonant inductance, and needn't use physics inductor, thereby increasing power density is to raise the efficiency and to save component costs.According in some examples of embodiment of the present utility model, the rectifier in the multiple single-phase DC-DC converter in multiphase DC-DC converter can use shared capacitor brachium pontis, thereby saves component costs.
For example can be applied to the onboard charger of telecommunication product or automobile (as electric automobile) according to the multiphase DC-DC converter of embodiment of the present utility model.
In the above in the description of the utility model specific embodiment, describe and/or the feature that illustrates can be used in same or similar mode in one or more other execution mode for a kind of execution mode, combined with the feature in other execution mode, or substitute the feature in other execution mode.
Should emphasize, term " comprises/comprises " existence that refers to feature, key element, step or assembly while use herein, but does not get rid of the existence of one or more further feature, key element, step or assembly or add.
Although describe by reference to the accompanying drawings above embodiment of the present utility model in detail, it should be understood that execution mode described above is just for the utility model is described, and do not form restriction of the present utility model.For a person skilled in the art, can make various modifications and changes and not deviate from essence of the present utility model and scope above-mentioned execution mode.Therefore, scope of the present utility model is only limited by appended claim and equivalents thereof.
Claims (13)
1. a multiphase DC-DC converter, comprising:
Input, for receiving DC input voitage;
The multiple single-phase DC-DC converter being connected in parallel, for carrying out DC-DC conversion by described DC input voitage;
Output, for exporting the VD through described multiple single-phase DC-DC converter conversion; And
Equalizing circuit, and the described multiple single-phase DC-DC converter being connected in parallel is connected in series between described input and described output, for the electric current of the described multiple single-phase DC-DC converters of equilibrium.
2. multiphase DC-DC converter according to claim 1, also comprises drive circuit, for driving described multiple single-phase DC-DC converter, has each other predetermined phase shift with the phase place of the output current that makes described multiple single-phase DC-DC converters.
3. multiphase DC-DC converter according to claim 1, wherein, described equalizing circuit is made up of differential mode inductance.
4. multiphase DC-DC converter according to claim 3, wherein, described output comprises the first output and the second output, the first coil of described differential mode inductance is connected in series between first common output and described the first output of described multiple single-phase DC-DC converters, and the second coil of described differential mode inductance is connected in series between second common output and described the second output of described multiple single-phase DC-DC converters.
5. multiphase DC-DC converter according to claim 3, wherein, described input comprises first input end and the second input, the first coil of described differential mode inductance is connected in series between described first input end and the first shared input of described multiple single-phase DC-DC converters, and the second coil of described differential mode inductance is connected in series between described the second input and the second shared input of described multiple single-phase DC-DC converters.
6. multiphase DC-DC converter according to claim 1, wherein, described equalizing circuit is made up of the inductor being connected in series and capacitor, and
Wherein, described input comprises first input end and the second input, one end that described inductor is connected with described capacitor is connected to the first shared input of described multiple single-phase DC-DC converters, the other end of described inductor is connected to described first input end, and one end not being connected with described inductor of described capacitor is connected to described the second input and is connected to the second shared input of described multiple single-phase DC-DC converters.
7. multiphase DC-DC converter according to claim 1, wherein, each the comprising in described multiple single-phase DC-DC transformers:
Main transformer, for carrying out transformation to described DC input voitage;
Switch element, comprise multiple switch elements, be arranged between the input of described single-phase DC-DC converter and the primary side of described main transformer, for operating by turning on and off of described multiple switch elements the primary side that described DC input voitage is provided to described main transformer; And
Rectifier, is connected between the primary side of described main transformer and the output of described single-phase DC-DC converter, carries out rectification for the voltage of the primary side output to described main transformer, to export described VD,
Wherein, described rectifier is full-bridge rectifier or half bridge rectifier.
8. multiphase DC-DC converter according to claim 7, wherein, described rectifier is half bridge rectifier, and the half bridge rectifier of described multiple single-phase DC-DC transformers has shared capacitor brachium pontis.
9. multiphase DC-DC converter according to claim 7, wherein, described rectifier is half bridge rectifier, and described equalizing circuit is connected between the diode brachium pontis and capacitor brachium pontis of described half bridge rectifier.
10. multiphase DC-DC converter according to claim 7, wherein, described switch element comprises the two or four switch element that bridge-type connects.
11. multiphase DC-DC converters according to claim 1, also comprise at least one filtering capacitor being connected in parallel between described multiple single-phase DC-DC converters and described equalizing circuit and described output, for the ripple of the output voltage of multiple single-phase DC-DC converters described in filtering.
12. multiphase DC-DC converters according to claim 7, wherein, in each single-phase DC-DC converter, in described switch element, the driving signal of each switch element has about 50% duty ratio, and between the driving signal of the first switch element in described switch element and the driving signal of second switch element, there is the phase shift of 180 degree, described the first switch element makes the primary side coil of described main transformer by the input current of first direction in the time of conducting, and described second switch element makes the primary side coil of described main transformer by the input current of the second direction contrary with first direction in the time of conducting.
13. multiphase DC-DC converters according to claim 2, wherein, described predetermined phase shift is 180 °/n, n is the number of described multiple single-phase DC-DC converters.
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| CN201420031852.2U CN203674977U (en) | 2014-01-17 | 2014-01-17 | Multiphase dc-dc converter |
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| CN201420031852.2U CN203674977U (en) | 2014-01-17 | 2014-01-17 | Multiphase dc-dc converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104795987A (en) * | 2014-01-17 | 2015-07-22 | 雅达电子国际有限公司 | Multiphase dc-dc converter |
| CN105529929A (en) * | 2016-01-26 | 2016-04-27 | 成都芯源系统有限公司 | Multiphase converter and automatic phase adjustment circuit and method for multiphase converter |
| CN105915091A (en) * | 2015-02-20 | 2016-08-31 | 通用电气能源能量变换技术有限公司 | Systems and method to optimize active current sharing of parallel power converters |
| CN108141131A (en) * | 2015-10-28 | 2018-06-08 | 株式会社自动网络技术研究所 | Multiphase converter |
-
2014
- 2014-01-17 CN CN201420031852.2U patent/CN203674977U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104795987A (en) * | 2014-01-17 | 2015-07-22 | 雅达电子国际有限公司 | Multiphase dc-dc converter |
| CN105915091A (en) * | 2015-02-20 | 2016-08-31 | 通用电气能源能量变换技术有限公司 | Systems and method to optimize active current sharing of parallel power converters |
| CN105915091B (en) * | 2015-02-20 | 2020-04-07 | 通用电气能源能量变换技术有限公司 | System and method for optimizing active current sharing of parallel power converters |
| CN108141131A (en) * | 2015-10-28 | 2018-06-08 | 株式会社自动网络技术研究所 | Multiphase converter |
| CN108141131B (en) * | 2015-10-28 | 2020-01-21 | 株式会社自动网络技术研究所 | Multi-phase converter |
| CN105529929A (en) * | 2016-01-26 | 2016-04-27 | 成都芯源系统有限公司 | Multiphase converter and automatic phase adjustment circuit and method for multiphase converter |
| CN105529929B (en) * | 2016-01-26 | 2018-04-06 | 成都芯源系统有限公司 | Multiphase converter and automatic phase adjustment circuit and method for multiphase converter |
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