CN102013806A - DC/DC converter suitable for high-voltage input high-power output - Google Patents
DC/DC converter suitable for high-voltage input high-power output Download PDFInfo
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- CN102013806A CN102013806A CN2010102996112A CN201010299611A CN102013806A CN 102013806 A CN102013806 A CN 102013806A CN 2010102996112 A CN2010102996112 A CN 2010102996112A CN 201010299611 A CN201010299611 A CN 201010299611A CN 102013806 A CN102013806 A CN 102013806A
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Abstract
The invention relates to a DC/DC converter suitable for high-voltage input high-power output, which comprises an input voltage-division circuit formed by serially connecting two input voltage division capacitors, a first resonant converter, a second resonant converter and an output filter capacitor shared by the two resonant converters, wherein the first resonant converter and the second resonant converter adopt an LLC serial resonant circuit; two ends of the first voltage division capacitor are connected with the input end of the first resonant converter, the output end of the first resonant converter is connected with the output filter capacitor; and two ends of the second input voltage division capacitor are connected with the input end of the second resonant converter, and the output end of the second resonant converter is connected with the output filter capacitor. The invention can effectively lower the voltage class of a switching tube and the cost, reduce the switching loss, and can effectively realize static and dynamic flow equalizing property between the two resonant converters, thereby improving the reliability.
Description
Technical field
The invention belongs to a kind of DC/DC converter.
Background technology
Along with the development of power electronic technology, more and more higher to the requirement of transformation of electrical energy device, particularly more and more higher to the requirement of input power factor.Behind three-phase activity coefficient adjustment, the output of circuit generally can reach 760 ~ 800V, and the electric pressure of the switching tube of the DC/DC converter of level after this just requires to improve makes the selection of power switch pipe become difficult, has increased manufacturing cost.And, in order to reduce the volume and weight of converter, must improve switching frequency, soft switch (being no-voltage or zero current) that will realistic existing switching tube is to reduce switching loss.
Summary of the invention
Select difficulty, cost is high, switching loss is bigger deficiency for the power tube that overcomes existing DC/DC converter, the invention provides a kind of electric pressure that can effectively reduce switching tube, reduce cost, reduce the DC/DC converter that high pressure is imported high-power output that is suitable for of switching loss.
The technical solution adopted for the present invention to solve the technical problems is:
A kind ofly be suitable for the DC/DC converter that high pressure is imported high-power output, comprise two input dividing potential drop capacitances in series composition input bleeder circuits, first controlled resonant converter, second controlled resonant converter and two output filter capacitors that controlled resonant converter is shared, wherein, described first controlled resonant converter and second controlled resonant converter adopt the LLC series resonant circuit; The two ends of the first input dividing potential drop electric capacity connect the input of first controlled resonant converter, and the output of described first controlled resonant converter connects output filter capacitor; The two ends of the second input dividing potential drop electric capacity connect the input of second controlled resonant converter, and the output of described second controlled resonant converter connects output filter capacitor.
Wherein, crisscross parallel (interleave) technology is used in first controlled resonant converter and the second controlled resonant converter work.S1, S6 turn on and off simultaneously in first controlled resonant converter; S2 and S5 turn on and off simultaneously, and the complementary conducting of S1, S2, and ON time is identical; S3, S8 turn on and off simultaneously in same second controlled resonant converter; S4 and S7 turn on and off simultaneously, and the complementary conducting of S3, S4, and ON time is identical; Make S3 open-minded when S1 conducting (or the turn-off) half the time by control circuit during circuit working, just can realize the crisscross parallel of two controlled resonant converters.Use the crisscross parallel technology, can reduce the current ripples on the output capacitance greatly, as Fig. 5, wherein Il3 and Il4 are respectively the output currents of two converters, I be Il3 and Il4 with, its fluctuation is exactly the ripple current of electric capacity.
Further, described output filter capacitor has two, and the output of described first controlled resonant converter connects first output filter capacitor, and the output of described second controlled resonant converter connects second output filter capacitor, two output filter capacitor parallel connections.
Further again, described first controlled resonant converter and second controlled resonant converter adopt full-bridge LLC series resonant circuit.
Or: described first controlled resonant converter and second controlled resonant converter adopt half-bridge LLC series resonant circuit.
Further, the circuit structure of described first controlled resonant converter: after first switching tube (S1), second switch pipe (S2) series connection, be connected in parallel on the two ends of the first input dividing potential drop electric capacity, after the 5th switching tube (S5) and the 6th switching tube (S6) series connection, also be connected in parallel on the two ends of the first input dividing potential drop electric capacity, each switching tube all with corresponding diode parallel connection; First resonant inductance (L1) is connected with the two ends, former limit of first transformer (T1) respectively with first resonant capacitance (C5), intermediate node between described first switching tube (S1), the second switch pipe (S2) is connected with first resonant capacitance (C5), intermediate node between the 5th switching tube (S5) and the 6th switching tube (S6) is connected with first resonant inductance (L1), the secondary of first transformer (T1) connects first rectification circuit, and the output of described first rectification circuit connects first output filter capacitor (C3);
The circuit structure of described second controlled resonant converter: after the 3rd switching tube (S3), the 4th switching tube (S4) series connection, be connected in parallel on the two ends of the second input dividing potential drop electric capacity, after the 7th switching tube (S7) and the 8th switching tube (S8) series connection, also be connected in parallel on the two ends of the second input dividing potential drop electric capacity, each switching tube all with corresponding diode parallel connection; Second resonant inductance (L2) is connected with the two ends, former limit of second transformer (T2) respectively with second resonant capacitance (C6), intermediate node between described the 3rd switching tube (S3), the 4th switching tube (S4) is connected with second resonant capacitance (C6), intermediate node between the 5th switching tube (S5) and the 6th switching tube (S6) is connected with second resonant inductance (L2), the secondary of second transformer (T2) connects second rectification circuit, and the output of described second rectification circuit connects second output filter capacitor (C4).
Described first rectification circuit is the full bridge rectifier of being made up of four diodes (D9, D10, D11, D12); Described second rectification circuit is the full bridge rectifier of being made up of four diodes (D13, D14, D15, D16).
Described first rectification circuit and second rectification circuit are circuit of synchronous rectification.
The diode corresponding with each switching tube is the parasitic diode or the compound diode of switching tube.
Technical conceive of the present invention is: by the series connection on two former limits of LLC circuit, make the stress of switching tube reduce half; Crisscross parallel by outlet side reduces the current ripples of output greatly; Kept LLC series resonant converter main switch and under zero-voltage state, turned on and off, the characteristics that the output rectifying tube turn-offs under zero current condition, and also two converters have the dynamic and static ability of independently dividing equally power output.
Beneficial effect of the present invention is: 1, by the series connection of circuit input end, make the voltage stress of switching tube be reduced to half of conventional transducers; Crisscross parallel by output makes the current ripples that is added on the output filter capacitor reduce greatly than conventional transducers, can effectively reduce output filter capacitor; 2, utilize the characteristics of circuit, effectively realized static state and dynamic current equalizing performance between two controlled resonant converters, improved reliability.
Description of drawings
Fig. 1 is suitable for the circuit diagram that high pressure is imported the DC/DC converter of high-power output.
Fig. 2 is the improvement schematic diagram of DC/DC converter shown in Figure 1.
Fig. 3 is the improvement schematic diagram of DC/DC converter shown in Figure 2.
Fig. 4 is the improvement schematic diagram of DC/DC converter shown in Figure 2.
Fig. 5 is the output current schematic diagram of converter A and B.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
With reference to Fig. 1, a kind ofly be suitable for the DC/DC converter that high pressure is imported high-power output, comprise two input dividing potential drop capacitances in series composition input bleeder circuits 1, first controlled resonant converter 2, second controlled resonant converter 3 and two output filter capacitors 4 that controlled resonant converter is shared, wherein, described first controlled resonant converter 2 and second controlled resonant converter 3 adopt the LLC series resonant circuit; The two ends of the first input dividing potential drop electric capacity connect the input of first controlled resonant converter, and the output of described first controlled resonant converter connects output filter capacitor; The two ends of the second input dividing potential drop electric capacity connect the input of second controlled resonant converter, and the output of described second controlled resonant converter connects output filter capacitor.
Wherein, crisscross parallel (interleave) technology is used in first controlled resonant converter and the second controlled resonant converter work.S1, S6 turn on and off simultaneously in first controlled resonant converter; S2 and S5 turn on and off simultaneously, and the complementary conducting of S1, S2, and ON time is identical; S3, S8 turn on and off simultaneously in same second controlled resonant converter; S4 and S7 turn on and off simultaneously, and the complementary conducting of S3, S4, and ON time is identical; Make S3 open-minded when S1 conducting (or the turn-off) half the time by control circuit during circuit working, just can realize the crisscross parallel of two controlled resonant converters.Use the crisscross parallel technology, can reduce the current ripples on the output capacitance greatly, as Fig. 5, wherein Il3 and Il4 are respectively the output currents of two converters, I be Il3 and Il4 with, its fluctuation is exactly the ripple current of electric capacity.
Described output filter capacitor has two, and the output of described first controlled resonant converter connects first output filter capacitor, and the output of described second controlled resonant converter connects second output filter capacitor, two output filter capacitor parallel connections.
Described first controlled resonant converter and second controlled resonant converter adopt full-bridge LLC series resonant circuit.Or: described first controlled resonant converter and second controlled resonant converter adopt half-bridge LLC series resonant circuit.
The particular circuit configurations of full-bridge LLC series resonant circuit is: the circuit structure of described first controlled resonant converter: after first switching tube (S1), second switch pipe (S2) series connection, be connected in parallel on the two ends of the first input dividing potential drop electric capacity, after the 5th switching tube (S5) and the 6th switching tube (S6) series connection, also be connected in parallel on the two ends of the first input dividing potential drop electric capacity, each switching tube all with corresponding diode parallel connection; First resonant inductance (L1) is connected with the two ends, former limit of first transformer (T1) respectively with first resonant capacitance (C5), intermediate node between described first switching tube (S1), the second switch pipe (S2) is connected with first resonant capacitance (C5), intermediate node between the 5th switching tube (S5) and the 6th switching tube (S6) is connected with first resonant inductance (L1), the secondary of first transformer (T1) connects first rectification circuit, and the output of described first rectification circuit connects first output filter capacitor (C3);
The circuit structure of described second controlled resonant converter: after the 3rd switching tube (S3), the 4th switching tube (S4) series connection, be connected in parallel on the two ends of the second input dividing potential drop electric capacity, after the 7th switching tube (S7) and the 8th switching tube (S8) series connection, also be connected in parallel on the two ends of the second input dividing potential drop electric capacity, each switching tube all with corresponding diode parallel connection; Second resonant inductance (L2) is connected with the two ends, former limit of second transformer (T2) respectively with second resonant capacitance (C6), intermediate node between described the 3rd switching tube (S3), the 4th switching tube (S4) is connected with second resonant capacitance (C6), intermediate node between the 5th switching tube (S5) and the 6th switching tube (S6) is connected with second resonant inductance (L2), the secondary of second transformer (T2) connects second rectification circuit, and the output of described second rectification circuit connects second output filter capacitor (C4).
Described first rectification circuit is the full bridge rectifier of being made up of four diodes (D9, D10, D11, D12); Described second rectification circuit is the full bridge rectifier of being made up of four diodes (D13, D14, D15, D16).
Described first rectification circuit and second rectification circuit are circuit of synchronous rectification.
The diode corresponding with each switching tube is the parasitic diode or the compound diode of switching tube.
The course of work of present embodiment: during circuit working, the voltage that the switching tube of first controlled resonant converter 2 and second controlled resonant converter 3 bears is half of input voltage, and two controlled resonant converters have the ability of autonomous mean allocation output current, such as: when first controlled resonant converter, 2 output currents during greater than second controlled resonant converter 3, then the voltage of the prime first input dividing potential drop capacitor C 1 of first controlled resonant converter 2 descends, the voltage of the corresponding second input dividing potential drop capacitor C 2 rises, therefore the output current of first controlled resonant converter 2 descends, the output current of second controlled resonant converter 3 rises, and finally makes the output current of two controlled resonant converters when stable state equal substantially.
Fig. 2 is the improvement of Fig. 1, promptly at the transformer secondary inductance (Ls3, Ls4) of connecting respectively, also can utilize the secondary leakage inductance of transformer self, guarantees under the situation of output loading sudden change the dynamic current equalizing of two controlled resonant converters.
After on Fig. 2 basis the inductance that increases being moved to rectifier bridge, as L3, the L4 of Fig. 3.
With the inductance coupling high that increases, the latter directly uses an inductance, as the L3 of Fig. 4 on Fig. 3 basis.
These several circuit all can guarantee under the situation of output loading sudden change, the dynamic current equalizing of two controlled resonant converters.
Fig. 5 is output current (Il3, Il4) and the total current (I) of converter A and B, because the effect of output crisscross parallel, the fluctuation of I reduces greatly, and current ripples is less, so output filter capacitor can significantly reduce.
Claims (9)
1. one kind is suitable for the DC/DC converter that high pressure is imported high-power output, it is characterized in that: described DC/DC converter comprises two input dividing potential drop capacitances in series composition input bleeder circuits, first controlled resonant converter, second controlled resonant converter and two output filter capacitors that controlled resonant converter is shared, wherein, described first controlled resonant converter and second controlled resonant converter adopt the LLC series resonant circuit; The two ends of the first input dividing potential drop electric capacity connect the input of first controlled resonant converter, and the output of described first controlled resonant converter connects output filter capacitor; The two ends of the second input dividing potential drop electric capacity connect the input of second controlled resonant converter, and the output of described second controlled resonant converter connects output filter capacitor.
2. as claimed in claim 1ly be suitable for the DC/DC converter that high pressure is imported high-power output, it is characterized in that: described output filter capacitor has two, the output of described first controlled resonant converter connects first output filter capacitor, the output of described second controlled resonant converter connects second output filter capacitor, two output filter capacitor parallel connections.
3. as claimed in claim 1 or 2ly be suitable for the DC/DC converter that high pressure is imported high-power output, it is characterized in that: described first controlled resonant converter and second controlled resonant converter adopt full-bridge LLC series resonant circuit.
4. as claimed in claim 1 or 2ly be suitable for the DC/DC converter that high pressure is imported high-power output, it is characterized in that: described first controlled resonant converter and second controlled resonant converter adopt half-bridge LLC series resonant circuit.
5. as claimed in claim 3ly be suitable for the DC/DC converter that high pressure is imported high-power output, it is characterized in that: the circuit structure of described first controlled resonant converter: after first switching tube (S1), second switch pipe (S2) series connection, be connected in parallel on the two ends of the first input dividing potential drop electric capacity, after the 5th switching tube (S5) and the 6th switching tube (S6) series connection, also be connected in parallel on the two ends of the first input dividing potential drop electric capacity, each switching tube all with corresponding diode parallel connection; First resonant inductance (L1) is connected with the two ends, former limit of first transformer (T1) respectively with first resonant capacitance (C5), intermediate node between described first switching tube (S1), the second switch pipe (S2) is connected with first resonant capacitance (C5), intermediate node between the 5th switching tube (S5) and the 6th switching tube (S6) is connected with first resonant inductance (L1), the secondary of first transformer (T1) connects first rectification circuit, and the output of described first rectification circuit connects first output filter capacitor (C3);
The circuit structure of described second controlled resonant converter: after the 3rd switching tube (S3), the 4th switching tube (S4) series connection, be connected in parallel on the two ends of the second input dividing potential drop electric capacity, after the 7th switching tube (S7) and the 8th switching tube (S8) series connection, also be connected in parallel on the two ends of the second input dividing potential drop electric capacity, each switching tube all with corresponding diode parallel connection; Second resonant inductance (L2) is connected with the two ends, former limit of second transformer (T2) respectively with second resonant capacitance (C6), intermediate node between described the 3rd switching tube (S3), the 4th switching tube (S4) is connected with second resonant capacitance (C6), intermediate node between the 5th switching tube (S5) and the 6th switching tube (S6) is connected with second resonant inductance (L2), the secondary of second transformer (T2) connects second rectification circuit, and the output of described second rectification circuit connects second output filter capacitor (C4).
6. as claimed in claim 5ly be suitable for the DC/DC converter that high pressure is imported high-power output, it is characterized in that: the full bridge rectifier of described first rectification circuit for forming by four diodes (D9, D10, D11, D12); Described second rectification circuit is the full bridge rectifier of being made up of four diodes (D13, D14, D15, D16).
7. as claimed in claim 5ly be suitable for the DC/DC converter that high pressure is imported high-power output, it is characterized in that: described first rectification circuit and second rectification circuit are circuit of synchronous rectification.
8. as claimed in claim 5ly be suitable for the DC/DC converter that high pressure is imported high-power output, it is characterized in that: the diode corresponding with each switching tube is the parasitic diode or the compound diode of switching tube.
9. as claimed in claim 1 or 2ly be suitable for the DC/DC converter that high pressure is imported high-power output, it is characterized in that: adopt the crisscross parallel technology, reduce the ripple current of output capacitance.
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| CN2010102996112A CN102013806A (en) | 2010-03-10 | 2010-09-30 | DC/DC converter suitable for high-voltage input high-power output |
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| CN201010122966.4 | 2010-03-10 | ||
| CN201010122966 | 2010-03-10 | ||
| CN2010102996112A CN102013806A (en) | 2010-03-10 | 2010-09-30 | DC/DC converter suitable for high-voltage input high-power output |
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Cited By (13)
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| CN102611315A (en) * | 2012-03-22 | 2012-07-25 | 华为技术有限公司 | Resonant switching circuit |
| CN103312171A (en) * | 2013-06-15 | 2013-09-18 | 浙江大学 | Isolated soft switching two-diode forward resonant DC / DC (direct-current/direct-current) circuit |
| CN103795262A (en) * | 2014-02-20 | 2014-05-14 | 东南大学 | LC parallel resonance boost direct/direct converter and control method thereof |
| CN104201900A (en) * | 2014-09-18 | 2014-12-10 | 南京航空航天大学 | Resonant converter and method for controlling same |
| CN104734483A (en) * | 2015-03-11 | 2015-06-24 | 北京交通大学 | DC bus capacitor voltage equalizing device |
| CN105634283A (en) * | 2014-11-24 | 2016-06-01 | 联发科技股份有限公司 | Power management device and harmonic cancellation method |
| CN105763060A (en) * | 2014-12-19 | 2016-07-13 | 华为技术有限公司 | DC/DC resonant module |
| CN106487236A (en) * | 2016-10-18 | 2017-03-08 | 北京无线电测量研究所 | A kind of input series connection, the bus translation circuit of output-parallel structure |
| WO2017041635A1 (en) * | 2015-08-31 | 2017-03-16 | 董武文 | Polarity-based rectifying and filtering method |
| CN107276190A (en) * | 2017-05-27 | 2017-10-20 | 华为技术有限公司 | The Wave method and device, equipment of a kind of underloading ripple |
| CN110212794A (en) * | 2019-05-20 | 2019-09-06 | 深圳市优优绿能电气有限公司 | A kind of rectification equalizer circuit and high-power power conversion system |
| CN114825941A (en) * | 2022-06-20 | 2022-07-29 | 麦田能源有限公司 | Power conversion system, control method of conversion device and flyback power conversion system |
| CN115622201A (en) * | 2022-12-13 | 2023-01-17 | 麦田能源有限公司 | Power supply conversion system, power supply conversion device and battery pack voltage balance control method |
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| WO2012126436A3 (en) * | 2012-03-22 | 2013-02-21 | 华为技术有限公司 | Resonant conversion circuit |
| CN102611315A (en) * | 2012-03-22 | 2012-07-25 | 华为技术有限公司 | Resonant switching circuit |
| CN103312171A (en) * | 2013-06-15 | 2013-09-18 | 浙江大学 | Isolated soft switching two-diode forward resonant DC / DC (direct-current/direct-current) circuit |
| CN103312171B (en) * | 2013-06-15 | 2016-04-20 | 浙江大学 | Isolated soft switching double tube positive exciting resonance DC/DC circuit |
| CN103795262A (en) * | 2014-02-20 | 2014-05-14 | 东南大学 | LC parallel resonance boost direct/direct converter and control method thereof |
| CN104201900A (en) * | 2014-09-18 | 2014-12-10 | 南京航空航天大学 | Resonant converter and method for controlling same |
| US9991780B2 (en) | 2014-11-24 | 2018-06-05 | Mediatek Inc. | Devices and methods of cancelling the switching noise from power management integrated circuits |
| CN105634283A (en) * | 2014-11-24 | 2016-06-01 | 联发科技股份有限公司 | Power management device and harmonic cancellation method |
| CN105634283B (en) * | 2014-11-24 | 2018-08-10 | 联发科技股份有限公司 | Power management apparatus and harmonic Elimination Method |
| CN105763060A (en) * | 2014-12-19 | 2016-07-13 | 华为技术有限公司 | DC/DC resonant module |
| CN105763060B (en) * | 2014-12-19 | 2019-01-08 | 华为技术有限公司 | A kind of DC/DC resonance modules |
| CN104734483A (en) * | 2015-03-11 | 2015-06-24 | 北京交通大学 | DC bus capacitor voltage equalizing device |
| WO2017041635A1 (en) * | 2015-08-31 | 2017-03-16 | 董武文 | Polarity-based rectifying and filtering method |
| CN106487236A (en) * | 2016-10-18 | 2017-03-08 | 北京无线电测量研究所 | A kind of input series connection, the bus translation circuit of output-parallel structure |
| CN107276190A (en) * | 2017-05-27 | 2017-10-20 | 华为技术有限公司 | The Wave method and device, equipment of a kind of underloading ripple |
| CN107276190B (en) * | 2017-05-27 | 2020-02-21 | 华为技术有限公司 | Light-load ripple wave sending method, device and equipment |
| CN110212794A (en) * | 2019-05-20 | 2019-09-06 | 深圳市优优绿能电气有限公司 | A kind of rectification equalizer circuit and high-power power conversion system |
| CN114825941A (en) * | 2022-06-20 | 2022-07-29 | 麦田能源有限公司 | Power conversion system, control method of conversion device and flyback power conversion system |
| CN115622201A (en) * | 2022-12-13 | 2023-01-17 | 麦田能源有限公司 | Power supply conversion system, power supply conversion device and battery pack voltage balance control method |
| CN115622201B (en) * | 2022-12-13 | 2023-04-07 | 麦田能源有限公司 | Power supply conversion system, power supply conversion device and battery pack voltage balance control method |
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Application publication date: 20110413 |