CN102064707B - Input parallel and output parallel combination converter under control of common phase-shifting angle - Google Patents
Input parallel and output parallel combination converter under control of common phase-shifting angle Download PDFInfo
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Abstract
The invention discloses an input parallel and output parallel combination converter under the control of a common phase-shifting angle. A main circuit comprises more than two phase-shifting circuits under the control of the common phase-shifting angle; each phase-shifting circuit consists of a transformer with leakage inductance and two bridge circuits which are connected through the transformer; and the input ends of all the phase-shifting circuits are connected in parallel and the output ends of all the phase-shifting circuits are connected in parallel. Under the control of the common phase-shifting angle, input current of all the phase-shifting circuits is equal and output current of all the phase-shifting circuits is equal, natural current sharing is realized, current sharing control loops are not needed to be added, each phase-shifting circuit unit is not needed to be subjected to current sampling, control is greatly simplified, power density and stability of the combination converter are improved, and cost is reduced.
Description
Technical field
The invention belongs to electric and electronic technical field, relate to the correlation technique of the input output-parallel converter in parallel in DC/DC conversion field, relate in particular to the Current Sharing Technology of distributed power source.
Background technology
Along with the increase of power grade, the volume of transformer of converter can and then increase, and the current stress of magnetic loss, switching tube also can increase thereupon, and this has just limited efficient and the power density of converter.In parallel and output parallel connection can reduce the power grade of single inverter at input with up converter with two and two, thereby guarantees that single inverter is operated in preferable states.In addition, usually adopt the crisscross parallel mode with the current ripples of minimizing input and output between each converter, thereby reduce the volume of input and output filter capacitor.In view of above advantage, input and output-parallel combination converter are used widely in middle high power D C/DC conversion field.
But usually need to take the current-sharing measure between input and each converter of output-parallel combination converter, its purpose is to guarantee the uniform distribution of electric stress and thermal stress between converter.Because each converter characteristic of parallel running is also inconsistent, the external characteristic better converter of (voltage regulation is little) can be born more electric current, even overload, and the relatively poor converter of external characteristic then runs on light condition, or even unloaded.Therefore, share the many converters of electric current and bearing larger electric stress and thermal stress with respect to other converter, be out of order easily and aging, thereby reduced reliability and the efficient of whole converter.
At present, current equalizing method roughly is divided into two large classes: droop method (droop method) and active current-equalizing method (active current sharing method), but these current equalizing methods all need each power converter cells is carried out current sample basically, if adopt digital control, current sample point of every increase just needs to increase an analog to digital converter (ADC), and the current-sharing performance of flow equalizing ring is subject to the sampling precision restriction, can not guarantee extraordinary current-sharing effect even add flow equalizing ring, and the flow equalizing ring design comparison of n power converter cells is complicated.In a word, add flow equalizing ring and reduced power density and the reliability of combined converter, and increased cost and strengthened the complexity of control.
Summary of the invention
The object of the present invention is to provide a kind of common phase shifting angle to control, do not need input and the output-parallel combination converter of flow equalizing ring.
For achieving the above object, the technical solution used in the present invention is: the main circuit of this combined converter comprises the phase-shift circuit that adopts common phase shifting angle control more than two, described phase-shift circuit is made of transformer and two bridge circuits with leakage inductance, two described bridge circuits connect by described transformer, and the input of each phase-shift circuit output in parallel and each phase-shift circuit is in parallel.
Further, bridge circuit of the present invention can be the full-bridge bridge circuit, the former limit of described transformer and the secondary capacitance of connecting respectively.
Further, bridge circuit of the present invention can be the half-bridge bridge circuit, and two described half-bridge bridge circuits are identical with the brachium pontis type that the Same Name of Ends of described transformer connects.
Further, the present invention is in each described phase-shift circuit, and the midpoint of the brachium pontis that is made of switching tube that is positioned at the half-bridge bridge circuit of transformer primary side connects an end of inductance, and the other end of described inductance is as the positive pole of the input of place phase-shift circuit.
Compared with prior art, advantage of the present invention is: do not need each phase-shift circuit unit is carried out current sample, do not need to add the sharing control ring, but still can realize current-sharing.The separately co-ordination of power switch pipe of each phase-shift circuit unit by using of the present invention, its input and output electric current has the characteristic that is similar to controlled current source, namely under fixing phase shifting angle, input current is proportional to output voltage, output current is proportional to input voltage, and described each phase-shift circuit is in parallel at input and output, its input voltage and output voltage equate, therefore, under common phase shifting angle control, the input current of each phase-shift circuit equates and the output current of each phase-shift circuit equates, this combined converter is realized naturally sharing current, does not need to add the sharing control ring, has greatly simplified control, thereby improved power density and the reliability of combined converter, also reduced cost.In addition, the present invention adopts interleaving technique, the driving signal of n the phase-shift circuit unit 360 °/n angle that staggers successively, thereby so that the input and output current ripples is reduced to original 1/n, and then reduce the volume of input and output filter capacitor.
Description of drawings
Fig. 1 is the circuit theory diagrams of the first execution mode of combined converter of the present invention;
Fig. 2 is the circuit theory diagrams of the second execution mode of combined converter of the present invention;
Fig. 3 is the circuit theory diagrams of the third execution mode of combined converter of the present invention;
Fig. 4 is the driving sequential chart of the single phase-shift circuit of combined converter of the present invention;
Fig. 5 is the common phase shifting angle control schematic diagram of combined converter of the present invention.
Embodiment
As shown in Figure 1, as the first execution mode of the present invention, the main circuit of combined converter comprises the phase-shift circuit that adopts common phase shifting angle control more than two, is respectively: phase-shift circuit unit one, phase-shift circuit unit two ... phase-shift circuit unit n.Each phase-shift circuit is made of transformer T, full-bridge bridge circuit Hp and full-bridge bridge circuit Hs, full-bridge bridge circuit Hp is connected transformer T and connects with full-bridge bridge circuit Hs, transformer T is with the former limit of leakage inductance Lk and transformer T and secondary connect respectively capacitance Cp and capacitance Cs.Leakage inductance Lk has comprised because of the other not inductance of coming in of connecting of the leakage inductance of transformer T itself.One group of Same Name of Ends of transformer T is connected to respectively the tie point of upper power switch tube S 1, lower power switch tube S 2 of the brachium pontis of full-bridge bridge circuit Hp and full-bridge bridge circuit Hs with it between the tie point of upper power switch tube S 5, the lower power switch tube S 6 of corresponding phase shift brachium pontis; Another group Same Name of Ends of transformer T is connected to respectively between the tie point of power switch tube S 7, lower power switch tube S 8 on the tie point of power switch tube S 3, lower power switch tube S 4 on another brachium pontis of full-bridge bridge circuit Hp and another brachium pontis of full-bridge bridge circuit Hs.Be positioned at two bus leadings on the full-bridge bridge circuit Hp of transformer primary side out as input.Be positioned at two bus leadings on the full-bridge bridge circuit Hs of transformer secondary out as output.The input of each phase-shift circuit output in parallel and each phase-shift circuit is in parallel.Each phase-shift circuit units shared input filter capacitor and output filter capacitor.Anti-and the power diode of each power switch pipe: the drain electrode of power switch tube S 1, power switch tube S 2, power switch tube S 3, power switch tube S 4, power switch tube S 5, power switch tube S 6, power switch tube S 7, power switch tube S 8 links to each other with corresponding anti-and diode D1, anti-and diode D2, anti-and diode D3, anti-and diode D4, anti-and diode D5, anti-and diode D6, anti-and diode D7, negative electrode anti-and diode D8 respectively; The source electrode of power switch tube S 1, power switch tube S 2, power switch tube S 3, power switch tube S 4, power switch tube S 5, power switch tube S 6, power switch tube S 7, power switch tube S 8 links to each other with corresponding anti-and diode D1, anti-and diode D2, anti-and diode D3, anti-and diode D4, anti-and diode D5, anti-and diode D6, anti-and diode D7, anode anti-and diode D8 respectively.The upper and lower power switch pipe of each brachium pontis connects in the same way, be that the drain electrode of upper and lower power switch pipe is upper, source electrode is lower, and the source electrode of upper power switch tube S 1, upper power switch tube S 3, upper power switch tube S 5, upper power switch tube S 7 is connected with the drain electrode of lower power switch tube S 2, lower power switch tube S 4, lower power switch tube S 6, lower power switch tube S 8 respectively.The grid of each power switch pipe and source electrode extract and connect the driving signal.Power switch tube S 1, power switch tube S 4 common drive signals 1, power switch tube S 2, power switch tube S 3 common drive signals 2, power switch tube S 5, power switch tube S 8 common drive signals 3, power switch tube S 6, power switch tube S 7 common drive signals 4.Present embodiment is than second, third kind execution mode, the advantage that has is: under identical circuit parameter and identical input parameter, the single phase-shift circuit unit of present embodiment can transmit larger power, changing kind of a mode says and is exactly, under identical circuit parameter and identical input parameter, realize same gross output, the required phase-shift circuit element number of present embodiment still less.
As shown in Figure 2, as the second execution mode of the present invention, the main circuit of combined converter comprises the phase-shift circuit that adopts common phase shifting angle control more than two, is respectively: phase-shift circuit unit one, phase-shift circuit unit two ... phase-shift circuit unit n.Each phase-shift circuit is made of transformer T, half-bridge bridge circuit Hp and the half-bridge bridge circuit Hs with leakage inductance Lk, and half-bridge bridge circuit Hp is connected transformer T and connects with half-bridge bridge circuit Hs.Leakage inductance Lk comprises because of the other not inductance of coming in of connecting of the leakage inductance of transformer T itself.Two half-bridge bridge circuits are identical with the brachium pontis type that the Same Name of Ends of described transformer connects, and the brachium pontis that namely is connected with Same Name of Ends must be together the brachium pontis that is made of power switch pipe or be together the brachium pontis that is made of electric capacity.One group of Same Name of Ends of transformer T is connected to respectively between the tie point of the tie point of the upper power switch tube S 1 of half-bridge bridge circuit Hp, lower power switch tube S 2 and the upper power switch tube S 3 of half-bridge bridge circuit Hs, lower power switch tube S 4, and another group Same Name of Ends of transformer T is connected to respectively between the tie point of upper electric capacity C3, lower capacitor C 4 of the tie point of upper electric capacity C1, lower capacitor C 2 of half-bridge bridge circuit Hp and half-bridge bridge circuit Hs.Be positioned at two bus leadings on the half-bridge bridge circuit Hp of transformer primary side out as input.Be positioned at two bus leadings on the half-bridge bridge circuit Hs of transformer secondary out as output.The input of each phase-shift circuit output in parallel and each phase-shift circuit is in parallel.Each phase-shift circuit units shared input filter capacitor and output filter capacitor.Anti-and the power diode of each power switch pipe: the drain electrode of power switch tube S 1, power switch tube S 2, power switch tube S 3, power switch tube S 4 links to each other with corresponding anti-and diode D1, anti-and diode D2, anti-and diode D3, negative electrode anti-and diode D4 respectively; The source electrode of power switch tube S 1, power switch tube S 2, power switch tube S 3, power switch tube S 4 links to each other with corresponding anti-and diode D1, anti-and diode D2, anti-and diode D3, anode anti-and diode D4 respectively.The upper and lower power switch pipe of each brachium pontis connects in the same way, i.e. the drain electrode of upper and lower power switch pipe is upper, and source electrode is lower, and the source electrode of upper power switch tube S 1, upper power switch tube S 3 is connected with the drain electrode of lower power switch tube S 2, lower power switch tube S 4 respectively.The upper and lower electric capacity of each brachium pontis connects in the same way, and namely the positive pole of upper and lower electric capacity is upper, and negative pole is lower, and the negative pole of upper electric capacity C1, upper electric capacity C3 is connected with the positive pole of lower capacitor C 2, lower capacitor C 4 respectively.The grid of each power switch pipe and source electrode extract and connect the driving signal.Power switch tube S 1 is used and is driven signal 1, and power switch tube S 2 is used and driven signal 2, and power switch tube S 3 is used and driven signal 3, and power switch tube S 4 is used and driven signal 4.Present embodiment is with respect to the first execution mode, and the advantage that has is: do not need capacitance.
As shown in Figure 3, as the third execution mode of the present invention, its execution mode and the second execution mode be not except same, other is all the same, this unique difference is: for each phase-shift circuit, be arranged in the half-bridge bridge circuit Hp on the former limit of transformer T, the midpoint of the brachium pontis that is made of power switch pipe is connected with inductance L, namely the tie point of the upper power switch tube S 1 of this half-bridge bridge circuit Hp and lower power switch tube S 2 is connected with an end of inductance L, and the other end of inductance L is as the positive pole of the input of place phase-shift circuit.Compare with the second execution mode, present embodiment is under same circuit parameter and same power output, and input voltage reduces by half, so present embodiment is input to the twice that the voltage gain of output is the second execution mode.
More than power switch pipe in three kinds of execution modes be generally Metal Oxide Silicon Field Effect Transistor (Metal Oxide Semiconductor Field-effect Transistor, MOSFET) or insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT).Described power switch pipe and anti-and diode thereof can be by consisting of after independent transistors and the separate diode inverse parallel, or are made of the transistor that inside carries anti-and diode.Capacitance in described the first execution mode is polarity free capacitor.Electric capacity in the described half-bridge bridge circuit or for the polarity electrochemical capacitor being arranged or for polarity free capacitor or being combined with for both.
Need to prove that the main circuit of combined converter of the present invention can only be made of two phase-shift circuits.
As shown in Figure 4, among the present invention, each phase-shift circuit adopts phase-shift control mode, altogether uses four groups to drive signal, is respectively and drives signal 1, drives signal 2, drives signal 3 and drive signal 4.Drive signal 1 and drive signal 2 complementations, half switch periods of each conducting.Drive signal 3 and drive signal 4 complementations, half switch periods of each conducting.Drive signal 3 hysteresis and drive 1 one angle Φ of signal (being phase shifting angle Φ), realize phase shifting control.Each power switch pipe drives co-ordination under the signal at above four groups, so that the input current of single phase-shift circuit and output current have similar and characteristic controlled current source, input current and phase shifting angle Φ and output voltage positive correlation, output current and phase shifting angle Φ and input voltage positive correlation, when fixing phase shifting angle Φ, input current is proportional to output voltage, and output current is proportional to input voltage.
As shown in Figure 5, consist of all n of the present invention phase-shift circuit unit (n 〉=2) and adopt common phase shifting angle control mode.N the same output voltage feedback signal Vf of phase-shift circuit units shared, behind the described feedback signal Vf process phase-shift circuit unit phase shift chip separately, produce driving signal separately, amplify through drive circuit again, finally offer power switch pipe separately, the switch motion of power ratio control switching tube.Because each phase-shift circuit unit adopts common phase shifting angle control, then the phase shifting angle Φ of each phase-shift circuit unit equates, and each phase-shift circuit is in parallel at input and output, its input voltage and output voltage equate, again in conjunction with the analysis of the preceding paragraph (when the fixing phase shifting angle Φ, input current is proportional to output voltage, output current is proportional to input voltage), can obtain, under common phase shifting angle control, the input current of each phase-shift circuit unit of combined converter of the present invention equates and the output current of each phase-shift circuit unit equates, realize naturally sharing current, do not need to add the sharing control ring, do not need each phase-shift circuit unit is carried out current sample, thereby improved power density and the reliability of combined converter.In addition synchronizing signal 1, synchronizing signal 2 ... synchronizing signal n 1/n the switch periods that stagger successively, thus realize that each phase-shift circuit drives the staggered of signal, and then reduce the volume of input and output filter capacitor.
Need to prove that the energy of combined converter of the present invention can two-way flow: when phase shifting angle Φ is timing, energy is realized forward flow from left to right; When phase shifting angle Φ when negative, energy is realized reverse flow from right to left.No matter energy is forward flow or reverse flow, and the control mode that n phase-shift circuit unit adopts all is above-described common phase shifting angle control mode.
Claims (4)
1. input and output-parallel combination converter under a common phase shifting angle is controlled, it is characterized in that: its main circuit comprises the phase-shift circuit that adopts common phase shifting angle control more than two, described phase-shift circuit is made of transformer and two bridge circuits with leakage inductance, two described bridge circuits connect by described transformer, and the input of each phase-shift circuit output in parallel and each phase-shift circuit is in parallel.
2. input and the output-parallel combination converter under the common phase shifting angle control according to claim 1, it is characterized in that: described bridge circuit is the full-bridge bridge circuit, the former limit of described transformer and the secondary capacitance of connecting respectively.
3. input and output-parallel combination converter under common phase shifting angle according to claim 1 is controlled, it is characterized in that: described bridge circuit is the half-bridge bridge circuit, and two described half-bridge bridge circuits are identical with the brachium pontis type that the Same Name of Ends of described transformer connects.
4. input and output-parallel combination converter under common phase shifting angle according to claim 3 is controlled, it is characterized in that: in each described phase-shift circuit, the midpoint of the brachium pontis that is made of power switch pipe that is positioned at the half-bridge bridge circuit of transformer primary side connects an end of inductance, and the other end of described inductance is as the positive pole of the input of phase-shift circuit.
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| CN 201110024261 CN102064707B (en) | 2011-01-21 | 2011-01-21 | Input parallel and output parallel combination converter under control of common phase-shifting angle |
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| CN 201110024261 CN102064707B (en) | 2011-01-21 | 2011-01-21 | Input parallel and output parallel combination converter under control of common phase-shifting angle |
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