CN105207471A - Low-voltage-stress high-voltage-drop DC/DC converter - Google Patents
Low-voltage-stress high-voltage-drop DC/DC converter Download PDFInfo
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- CN105207471A CN105207471A CN201510612667.1A CN201510612667A CN105207471A CN 105207471 A CN105207471 A CN 105207471A CN 201510612667 A CN201510612667 A CN 201510612667A CN 105207471 A CN105207471 A CN 105207471A
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Abstract
The invention provides a low-voltage-stress high-voltage-drop DC/DC converter. The low-voltage-stress high-voltage-drop DC/DC converter comprises two power inductors, two diodes and n voltage drop units. Each voltage drop unit is composed of two power switches and two capacitors, wherein the two capacitors are connected vertically in series, the node of the capacitor on the upper portion and the drain electrode of the corresponding power switch serves as a first port, the source electrode of the power switch on the upper portion serves as a second port, the drain electrode of the power switch on the lower portion serves as a third port, and the node of the capacitor on the lower portion and the source electrode of the power switch on the lower portion serves as a fourth port. Compared with an existing voltage drop converter, the low-voltage-stress high-voltage-drop DC/DC converter is simple in design and implementation scheme, no transformer or coupling inductor is included, the EMI characteristic is good, the input-output voltage drop ratio is adjustable, the voltage stress of a switching device is greatly reduced, and the overall working efficiency of the converter is improved.
Description
Technical field
The present invention relates to a kind of DC-DC converter, is a kind of low voltage stress height step-down DC/DC converter specifically.
Background technology
In the prior art, there is switching device voltage stress excessive in basic two-phase voltage-dropping type DC/DC converter, and loss is large, the problems such as efficiency is not high, and can not meet the demands in the occasion that some input and output step-down ratio is large.Therefore, a large amount of experts and scholars have done large quantity research for these problems, and propose corresponding solution.Generally speaking have by means of transformer and coupling inductance two kinds of solutions, wherein by means of transformer, the transformer of a high frequency is added in the middle of original DC-DC converter, the object of significantly step-down is realized by changing transformer voltage ratio, but program conversion process of energy is complicated, and the energy conversion efficiency of whole system is low.Adopt the topology that coupling inductance builds, due to the existence of leakage inductance, switching device voltage stress is comparatively large, and transducer loose is large.
Summary of the invention
Not high for solving existing converter operating efficiency, switching device voltage stress high-technology problem, the present invention proposes a kind of low voltage stress height step-down DC/DC converter, has the feature of low voltage stress, high step-down ability, and the ability of step-down is simultaneously adjustable.
The technical solution adopted in the present invention is:
A kind of low voltage stress height step-down DC/DC converter, comprise the first inductance L 1, second inductance L 2, diode D1, diode D2, n pressure unit, the output of the first inductance L 1 and the second inductance L 2 connects the positive pole of output filter capacitor Co and load simultaneously, and the input of the first inductance L 1 and the second inductance L 2 connects the negative electrode of diode D1 and diode D2 respectively;
Second interface of input termination n-th pressure unit of the first inductance L 1, the node up and down between two electric capacity of an input termination odd-times pressure unit of the first inductance L 1;
The node up and down between two electric capacity of an input termination even-times pressure unit of the second inductance L 2;
3rd port of Unit n-th is connected with the anode of diode D1, diode D2 simultaneously, and its node connects the negative pole of output filter capacitor Co and load simultaneously;
First port of first pressure unit is as the positive pole of DC source, and the 4th port of first pressure unit is as the negative pole of DC source;
Second port of first pressure unit connects the first port of second pressure unit, 3rd port of first pressure unit connects the 4th port of second pressure unit, second port of second pressure unit connects the first port of the 3rd pressure unit, 3rd port of second pressure unit connects the 4th port of the 3rd pressure unit, analogize in proper order, until the n-th pressure unit;
Wherein, pressure unit is made up of two power switchs and two electric capacity, two electric capacity are connected up and down, the node of the drain electrode of top electric capacity and top power switch is as the first port of pressure unit, the source electrode of top power switch is as the second port of pressure unit, the drain electrode of below power switch is as the 3rd port of pressure unit, and the node of the source electrode of below electric capacity and below power switch is as the 4th port of pressure unit;
N is natural number, and span is n >=1;
The grid of each power switch connects respective controller respectively.
A kind of low voltage stress height step-down DC/DC converter, its control mode is that each phase power switch adopts Interleaved control strategy, that is: differ 180 ° between odd-times switch and even-times switch drive phase place.
Compared to existing technology, a kind of low voltage stress height of the present invention step-down DC/DC converter, has following beneficial effect:
1), the present invention utilizes pressure unit to form decompression network, achieves 1/2n doubly to the input and output step-down ratio of basic Buck buck converter.
2), the voltage stress of circuit breaker in middle device obtains effective reduction.
3), compared with existing buck converter, not containing transformer and coupling inductance, EMI characteristic is good, and circuit topology is simple, Control System Design and to realize difficulty all lower.
4), converter can design according to the difference of embody rule occasion and adopt the pressure unit of varying number, extends the application scenario of converter.
Accompanying drawing explanation
Fig. 1 is the general circuit schematic diagram of embodiment of the present invention when containing n pressure unit.
Fig. 2 is that the embodiment of the present invention is only containing the circuit theory diagrams of four groups of pressure units.
Fig. 3 is the single pressure unit circuit diagram adopted in the present invention.
In Fig. 3: 1. the-the first port, 2. the-the second port, 3.-three port, 4.-four port.
Embodiment
A kind of low voltage stress height step-down DC/DC converter, comprise the first inductance L 1, second inductance L 2, diode D1, diode D2, n pressure unit, the output of the first inductance L 1 and the second inductance L 2 connects the positive pole of output filter capacitor Co and load simultaneously, and the input of the first inductance L 1 and the second inductance L 2 connects the negative electrode of diode D1 and diode D2 respectively;
Second interface of input termination n-th pressure unit of the first inductance L 1, the node up and down between two electric capacity of an input termination odd-times pressure unit of the first inductance L 1;
The node up and down between two electric capacity of an input termination even-times pressure unit of the second inductance L 2;
3rd port of Unit n-th is connected with the anode of diode D1, diode D2 simultaneously, and its node connects the negative pole of output filter capacitor Co and load simultaneously;
First port of first pressure unit is as the positive pole of DC source, and the 4th port of first pressure unit is as the negative pole of DC source;
Second port of first pressure unit connects the first port of second pressure unit, 3rd port of first pressure unit connects the 4th port of second pressure unit, second port of second pressure unit connects the first port of the 3rd pressure unit, 3rd port of second pressure unit connects the 4th port of the 3rd pressure unit, analogize in proper order, until the n-th pressure unit;
Wherein, pressure unit is made up of two power switchs and two electric capacity, two electric capacity are connected up and down, the node of the drain electrode of top electric capacity and top power switch is as the first port of pressure unit, the source electrode of top power switch is as the second port of pressure unit, the drain electrode of below power switch is as the 3rd port of pressure unit, and the node of the source electrode of below electric capacity and below power switch is as the 4th port of pressure unit; N is natural number, and span is n >=1.
The grid of each power switch connects respective controller respectively.
A kind of low voltage stress height step-down DC/DC converter, its control mode is that each phase power switch adopts Interleaved control strategy, that is: differ 180 ° between odd-times switch and even-times switch drive phase place.
Embodiment:
As shown in Figure 2, a kind of low voltage stress height step-down DC/DC converter, is made up of the first inductance L 1, second inductance L 2, two diodes D1, D2 and 4 pressure units.4 pressure units are made up of eight power switchs S1, S2, S3, S4, S5, S6, S7, S8 and eight electric capacity C1, C2, C3, C4, C5, C6, C7, C8.Its circuit connecting relation is:
The output of the first inductance L 1 and the second inductance L 2 connects the positive pole of output filter capacitor Co and load simultaneously, and the input of the first inductance L 1 and the second inductance L 2 connects the negative electrode of diode D1 and diode D2 respectively; The grid of all power switchs connects respective controller respectively.
Power switch S1, S3, S5, S7 connect, power switch S2, S4, S6, S8 connect, wherein the source electrode of power switch S1 is connected with the drain electrode of power switch S3, the source electrode of S3 is connected with the drain electrode of power switch S5, the source electrode of S5 is connected with the drain electrode of power switch S7, the source electrode of S8 is connected with the drain electrode of power switch S6, and the source electrode of S6 is connected with the drain electrode of power switch S4, and the source electrode of S4 is connected with the drain electrode of power switch S2; Electric capacity C1, C2 connect, and C3, C4 connect, and C5, C6 connect, and C7, C8 connect, and wherein electric capacity C1, C3, C5, C7 is positioned at top, and electric capacity C2, C4, C6, C8 are positioned at below; The node of electric capacity C1 and S1 is as the positive pole of input source, and the node of electric capacity C2 and S2 is as the negative pole of input source; The node that upper end and power switch S1, S3 of electric capacity C3 connect is connected, and the node that lower end and power switch S2, S4 of electric capacity C4 connect is connected; The node that upper end and power switch S3, S5 of electric capacity C5 connect is connected, and the node that lower end and power switch S4, S6 of electric capacity C6 connect is connected; The node that upper end and power switch S5, S7 of electric capacity C7 connect is connected, and the node that lower end and power switch S6, S8 of electric capacity C8 connect is connected; The upper end of electric capacity C7 is connected with the drain electrode of power switch S8, and the lower end of electric capacity C8 is connected with the source electrode of power switch S8.
The source electrode of the input termination power switch S7 of the first inductance L 1 simultaneously, the node of the negative electrode of diode D1 and electric capacity C1, C2 series connection and the node of electric capacity C5, C6 series connection; The negative electrode of the input terminating diode D2 of the second inductance L 2, and the node of the node of electric capacity C3, C4 series connection and electric capacity C7, C8 series connection; The node of the anode of the drain electrode of power switch S8 and two diodes D1, D2 connects the negative pole of output filter capacitor Co and load simultaneously.
According to the difference of power switch state, circuit can be divided into 3 kinds of operating states:
Mode 1: controller controls power switch S1, S4, S5, S8 conducting, and S2, S3, S6, S7 turn off, D1 conducting, and D2 turns off.The electric current of L1 through D1 to output capacitance and load discharge; The electric current of L2 through a D1 part by output capacitance and load, S8, C8, a part is by D1, C5, S5, C7, a part flows through C2 and DC source, another part flows through C1, S1, C3, also have part by C4, S4, C6, in this course, L1, C1, C4, C5, C8 discharge, L2, C2, C3, C6, C7 charge, and DC source is charged to electric capacity C1, C2.
Mode 2: controller controls power switch S1, S3, S5, S7, S2, S4, S6, S8 and turns off, D1, D2 conducting.This mode, inductance L 1, L2 are to output capacitance and load discharge.
Mode 3: controller controls power switch S1, S4, S5, S8 and turns off, S2, S3, S6, S7 conducting, and D1 turns off, D2 conducting.The electric current of L2 through D2 to output capacitance and load discharge; The electric current of L1 through a D1 part by output capacitance and load, S7, C7, a part is by D2, C8, S6, C6, a part flows through C4, S2, DC source, another part flows through C3, S3, C5, also have part by C4, S2, C2, in this course, L1, C1, C4, C5, C8 charge, L2, C2, C3, C6, C7 discharge, and DC source is charged to electric capacity C1, C2.
In sum, it is low that the present invention carries topological circuit switching device voltage stress, and step-down ratio is adjustable, can flexible Application in the occasion high to step-down Capability Requirement.Implement example and be only used to the DC/DC converter that operation principle elaboration simply have employed the high step-down ratio with 4 groups of pressure units, in the application of reality, can according to the number of practical situations choose reasonable voltage doubling unit, to reach the object of optimization efficiency and cost.
Claims (2)
1. a low voltage stress height step-down DC/DC converter, comprise the first inductance L 1, second inductance L 2, diode D1, diode D2, n pressure unit, it is characterized in that, the output of the first inductance L 1 and the second inductance L 2 connects the positive pole of output filter capacitor Co and load simultaneously, and the input of the first inductance L 1 and the second inductance L 2 connects the negative electrode of diode D1 and diode D2 respectively;
Second interface of input termination n-th pressure unit of the first inductance L 1, the node up and down between two electric capacity of an input termination odd-times pressure unit of the first inductance L 1;
The node up and down between two electric capacity of an input termination even-times pressure unit of the second inductance L 2;
3rd port of Unit n-th is connected with the anode of diode D1, diode D2 simultaneously, and its node connects the negative pole of output filter capacitor Co and load simultaneously;
First port of first pressure unit is as the positive pole of DC source, and the 4th port of first pressure unit is as the negative pole of DC source;
Second port of first pressure unit connects the first port of second pressure unit, 3rd port of first pressure unit connects the 4th port of second pressure unit, second port of second pressure unit connects the first port of the 3rd pressure unit, 3rd port of second pressure unit connects the 4th port of the 3rd pressure unit, analogize in proper order, until the n-th pressure unit;
Wherein, pressure unit is made up of two power switchs and two electric capacity, two electric capacity are connected up and down, the node of the drain electrode of top electric capacity and top power switch is as the first port of pressure unit, the source electrode of top power switch is as the second port of pressure unit, the drain electrode of below power switch is as the 3rd port of pressure unit, and the node of the source electrode of below electric capacity and below power switch is as the 4th port of pressure unit;
N is natural number, and span is n >=1;
The grid of each power switch connects respective controller respectively.
2. a kind of low voltage stress height step-down DC/DC converter according to claim 1, is characterized in that, differs 180 ° between odd-times switch and even-times switch drive phase place.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510612667.1A CN105207471A (en) | 2015-09-23 | 2015-09-23 | Low-voltage-stress high-voltage-drop DC/DC converter |
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| CN201510612667.1A CN105207471A (en) | 2015-09-23 | 2015-09-23 | Low-voltage-stress high-voltage-drop DC/DC converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107612340A (en) * | 2017-09-18 | 2018-01-19 | 电子科技大学 | A kind of low voltage stress isolating full-bridge converter circuit arrangement |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8130524B2 (en) * | 2008-09-22 | 2012-03-06 | Ablerex Electronics Co., Ltd. | Bi-directional DC to DC power converter having a neutral terminal |
| CN103618462A (en) * | 2013-12-16 | 2014-03-05 | 厦门大学 | Multiphase resonance bridge type modular multi-level switch capacitor converter |
| CN104218801A (en) * | 2014-09-26 | 2014-12-17 | 三峡大学 | Non-isolated high-gain DC/DC convertor |
| CN104218800A (en) * | 2014-09-26 | 2014-12-17 | 三峡大学 | High-reduction-voltage non-isolating-type direct current (DC)/DC converter |
| CN104283417A (en) * | 2013-07-12 | 2015-01-14 | 华硕电脑股份有限公司 | Multiphase voltage reduction direct-current converter |
-
2015
- 2015-09-23 CN CN201510612667.1A patent/CN105207471A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8130524B2 (en) * | 2008-09-22 | 2012-03-06 | Ablerex Electronics Co., Ltd. | Bi-directional DC to DC power converter having a neutral terminal |
| CN104283417A (en) * | 2013-07-12 | 2015-01-14 | 华硕电脑股份有限公司 | Multiphase voltage reduction direct-current converter |
| CN103618462A (en) * | 2013-12-16 | 2014-03-05 | 厦门大学 | Multiphase resonance bridge type modular multi-level switch capacitor converter |
| CN104218801A (en) * | 2014-09-26 | 2014-12-17 | 三峡大学 | Non-isolated high-gain DC/DC convertor |
| CN104218800A (en) * | 2014-09-26 | 2014-12-17 | 三峡大学 | High-reduction-voltage non-isolating-type direct current (DC)/DC converter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107612340A (en) * | 2017-09-18 | 2018-01-19 | 电子科技大学 | A kind of low voltage stress isolating full-bridge converter circuit arrangement |
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Application publication date: 20151230 |
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