CN111987902A - DC/DC converter circuit - Google Patents

DC/DC converter circuit Download PDF

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Publication number
CN111987902A
CN111987902A CN202010765631.8A CN202010765631A CN111987902A CN 111987902 A CN111987902 A CN 111987902A CN 202010765631 A CN202010765631 A CN 202010765631A CN 111987902 A CN111987902 A CN 111987902A
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switch tube
bridge arm
tube
capacitor
diode
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CN111987902B (en
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彭辉
张镠钟
游江
刘刚
王西贝
刘洪胜
周玮
李晓旭
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Harbin Engineering University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a DC/DC converter circuit, which comprises an input power supply, a first inductor (L)11) A second inductor (L)12) A third inductor (L)21) A fourth inductor (L)22) And a filter inductance (L)3) First capacitance (C)1) A second capacitor (C)2) And a filter capacitor (C)3) A first switch tube (S)11) A second switch tube (S)12) And a third switching tube (S)21) And a fourth switching tube (S)22) First diode (D)1) And a second diode (D)2) And the mutual connection relation. The invention can output the voltage u in the traditional boost converter under the condition of continuous inductive currentoFor input voltage uinThe boost ratio of
Figure DDA0002614470830000011
Is lifted to
Figure DDA0002614470830000012
D is the steady duty ratio to realize low voltageThe power supply is connected to a high-voltage system or converts a low-voltage power supply into high-voltage power required by a load.

Description

DC/DC converter circuit
Technical Field
The invention relates to a DC/DC converter circuit, in particular to a DC/DC converter circuit with high boosting capacity, belonging to the technical field of power electronics.
Background
In the fields of renewable energy power generation, energy storage application, fuel cell power generation and the like, a low-voltage direct-current power supply is generally connected to a high-voltage direct-current power grid for load use. Although theoretically, if the voltage drop loss of the line impedance is neglected, the conventional boost dc converter has infinite boost capability, the line loss increases with the increase of the load, and the boost capability of the conventional boost dc converter reaches the limit. Therefore, for a system with a larger capacity, especially for a system with a low-voltage and large-current characteristic on the power supply side, it is often necessary to actually connect the low-voltage power supply to the high-voltage system or convert the low-voltage power supply into high-voltage power required by a load through a DC/DC converter with a high step-up ratio.
Disclosure of Invention
In view of the above prior art, the technical problem to be solved by the present invention is to provide a combined DC/DC converter circuit with a significantly high voltage boosting capability, so as to realize that a low voltage power source is connected to a high voltage system or convert the low voltage power source into high voltage power required by a load.
In order to solve the above-mentioned technical problem, a DC/DC converter circuit of the present invention includes: a first bridge arm A, a second bridge arm B, a third bridge arm C and a fourth bridge arm D; the first bridge arm A comprises a first inductor L11And a first switching tube S11First inductance L11One end of the first inductor L is connected with the positive electrode of the power supply11The other end of the first switch tube S is connected with the first switch tube S11Collector electrode of (1), first switching tube S11The emitter of the anode is connected with the cathode of a power supply; the third bridge arm C bagIncluding a third inductor L21And a third switching tube S21The third bridge arm C has the same structure as the first bridge arm A and has the same power supply connection mode as the first bridge arm A; the second bridge arm B comprises a second inductor L12And a second switching tube S12A second switch tube S12The collector of the first switch tube is connected with the anode of the power supply, and the second switch tube S12Is connected with the second inductor L12One terminal of (1), a second inductance L12The other end of the power supply is connected with the negative electrode of the power supply; the fourth bridge arm D comprises a fourth inductor L22And a fourth switching tube S22The structure of the fourth bridge arm D is the same as that of the second bridge arm B, and the connection mode of the fourth bridge arm D and a power supply is the same as that of the second bridge arm B;
first diode D1Anode of the first switch tube S11Collector electrode of, the first diode D1Is connected with a first capacitor C1One terminal of (1), a first capacitor C1The other end of the first switch tube S is connected with a second switch tube S12The emission set of (1); second diode D2The cathode of the first switch tube is connected with the fourth switch tube S22Emitter of, a second diode D2Anode of is connected with a second capacitor C2One terminal of (C), a second capacitor C2The other end of the first switch tube is connected with a third switch tube S21A collector electrode of (a);
filter inductance L3One end of which is connected with a first diode D1Cathode of (2), filter inductance L3The other end of the filter is connected with a filter capacitor C3Positive electrode of (1), filter capacitor C3Negative pole of the first diode D is connected with the second diode D2The anode of (1);
the invention also includes:
1. filter capacitor C3Output voltage u at both endsoSatisfies the following conditions:
Figure BDA0002614470810000021
wherein u isinIs the power supply input voltage and D is the steady state duty cycle.
2. First switch tube S11A second switch tube S12A third switch tube S21And fourthSwitch tube S22All are full-control power electronic switching devices and are equipped with a switching tube driving module.
3. First switch tube S11A second switch tube S12A third switch tube S21And a fourth switching tube S22With the same duty cycle, the first switching tube S11A second switch tube S12Is synchronized with the driving pulse of the third switching tube S21And a fourth switching tube S22Is synchronized.
4. First switch tube S11And a third switch tube S21Are different from each other by a phase angle of 180 deg..
5. A first capacitor C1And a second capacitor C2All are polar capacitors, the first capacitor C1Is connected with a first diode D1A first capacitor C1Negative pole of the first switch tube S is connected with the second switch tube S12The emission set of (1); second capacitor C2The anode of the first switch tube is connected with a third switch tube S21Collector electrode of, a second capacitor C2Negative pole of the first diode D is connected with the second diode D2Of (2) an anode.
The invention has the beneficial effects that: the invention provides a DC/DC converter circuit with high boosting capability, which can output voltage (u) in a traditional boost converter under the condition of continuous inductive currento) For input voltage (u)in) The boost ratio of
Figure BDA0002614470810000022
(D is the steady state duty cycle) is raised to
Figure BDA0002614470810000023
When duty ratio D>After 0.2, the DC/DC converter designed by the invention can obtain 2 times of boosting capacity, and the traditional boost converter needs D to achieve the aim>0.5. When D is taken to be 0.9, the conventional boost converter has 10 times of boost capability, whereas the DC/DC converter of the present invention has 37 times of boost capability. When D is 0.95, the boost capacity of the conventional boost converter is 20 times that of the conventional boost converter, and the boost capacity of the DC/DC converter of the present invention is 73 times that of the conventional boost converter.
Drawings
FIG. 1 is a DC/DC converter circuit with high boost capability according to the present invention;
fig. 2 is a graph comparing the boost capability of the inventive DC/DC converter with that of a conventional boost converter.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings.
The present invention provides a DC/DC converter circuit with high boosting capability, comprising: input power u in circuitinAn inductance element L11、L12、L21And L22Capacitor element C1、C2And C3Diode element D1And D2Switching device S11、S12、S21And S22And the mutual connection relation between the loads R, the inductance element L11、L12、L21And L22Being identical inductive elements, diode elements D1And D2Being identical diodes, switching devices S11、S12、S21And S22Being identical switching tubes, capacitive elements C1、C2Are the same capacitance.
Referring to fig. 1, the DC/DC converter of the present invention is implemented in such a way that the switching tube in the embodiment is an IGBT, and any other fully-controlled power electronic switching device is adopted:
(1) inductor L11And a switching tube S11Are connected in series to form bridge arms A and L11And S11The connection point of (A) is the collector of the switching tube (as the point p in the bridge arm A in the figure)4A point); inductor L12And a switching tube S12Are connected in series to form bridge arms B and L12And S12The connection point of (A) is the emitter of the switching tube (as shown by the point p in the bridge arm B)9A point);
(2) connecting a bridge arm A and a bridge arm B in parallel, wherein an inductor L in the bridge arm A is connected with a transformer11Another end (p) of (b)3Point) is connected with the collector of the switch tube in the bridge arm B; the emitter (p) of the switching tube in the bridge arm A5Point) and inductance L in bridge arm B12The other ends of the two are connected;
(3) two common points of the two bridge arms after the bridge arm A and the bridge arm B are connected in parallel, such as p in the figure3Point sum p5Point is respectively connected with power source uinPositive electrode (p) of1Dots) and negative electrode (p)2Points) are connected together;
(4) will be a diode D1Is connected to the midpoint (p) of the bridge arm A4Point), a capacitor C1Are respectively connected with the diode D1Cathode (p)11Point) and the midpoint (p) of bridge arm B9Point) are connected together if the capacitance C is1Is a polar capacitor, then C1The positive electrode of (2) should be in contact with D1Of the cathode, C1Should be connected with the midpoint of the bridge arm B; if the capacitance C1Is a non-polar capacitor, then C1Either end of (A) and (D)1Of the cathode, C1The other end of the bridge arm B is connected with the middle point of the bridge arm B;
(5) inductor L21And a switching tube S21The bridge arm C identical to the bridge arm A is formed in series, and the point is marked as p7Point; inductor L22And a switching tube S22The bridge arm D identical to the bridge arm B is formed in series, and the point is marked as p10Point;
(6) and connecting the bridge arm C and the bridge arm D in parallel, wherein the parallel connection relationship of the bridge arm C and the bridge arm D is completely consistent with the parallel connection relationship of the bridge arm A and the bridge arm B. The common connection points of the two bridge arms after being connected in parallel are respectively switching tubes S in the bridge arms C21Emitter (P)8Point) and switching tube S in bridge arm D22Collector electrode (P)6Dot)
(7) Two common points, p in the figure, after connecting bridge arm C and bridge arm D in parallel6Point sum p8Point is respectively connected with power source uinPositive electrode (p) of1Dots) and negative electrode (p)2Points) are connected together;
(8) will be a diode D2Is connected to the midpoint (p) of the bridge arm D10Point), a capacitor C2Are respectively connected with the diode D2Anode (p) of12Point) and the midpoint (p) of bridge arm C7A point) are connected together,if the capacitance C2Is a polar capacitor, then C2Should be in contact with D2Anode connection of C2The positive pole of (a) should be connected with the midpoint of the bridge arm C; if the capacitance C2Is a non-polar capacitor, then C2Either end of (A) and (D)2Anode connection of C2The other end of the bridge arm C is connected with the middle point of the bridge arm C;
(9) an inductor L for filtering3And a diode D1Cathode (p)11Point) connection, L3Another end (p) of (b)13Point) and a filter capacitor C3Are connected together; capacitor C3Another end (p) of (b)14Dot) and diode D2Anode (p) of12Points) are connected together; a load (such as a resistor R in the figure) is connected with the capacitor C3Both ends (p) of13Point sum p14Point, p13Dot polarity is positive, p14Dot polarity is negative);
(10) switch tube S in the circuit11、S12、S21And S22With the same duty cycle. And S11And S12The drive pulses of (2) are synchronized; s21And S22The drive pulses of (2) are synchronized;
(11) when S is11And S12When conducting, the inductance L11And an inductance L12From a power supply uinCharging, at this time, the capacitor C1Supplying power to a load; when S is11And S12When turned off, the inductance L11And an inductance L12And a power supply uinAre led together through a diode D1Capacitor C1Charging while supplying power to the load, at which time the capacitor C1Has an average voltage of
Figure BDA0002614470810000041
Multiple input voltage (u)in)。
(12) When S is21And S22When conducting, the inductance L21And an inductance L22From a power supply uinCharging, at this time, the capacitor C2Supplying power to a load; when S is21And S22When turned off, the inductance L21And an inductance L22And a power supply uinAre led together through a diode D2Capacitor C2Charging while supplying power to the load, at which time the capacitor C2Has an average voltage of
Figure BDA0002614470810000042
Multiple input voltage (u)in)。
(13) Under the condition that the inductive current of each bridge arm is continuous, p11And p12The voltage between the two points passes through the inductor L3Capacitor C3Filtering to obtain stable output voltage (u)o) Is composed of
Figure BDA0002614470810000043
Multiple input voltage (u)in). I.e. the output voltage (u) of the DC/DC convertero) For input voltage (u)in) Can achieve the voltage boosting ratio
Figure BDA0002614470810000044
(14) In order to reduce the supply current (i)in) At S, the pulsating quantity of11And S12Is synchronized with the drive pulse of S, and21and S22Under the condition of synchronous driving pulse, can make S11And S21Are different from each other by a phase angle of 180 deg..

Claims (6)

1. A DC/DC converter circuit, comprising: a first bridge arm (A), a second bridge arm (B), a third bridge arm (C) and a fourth bridge arm (D); the first leg (A) comprises a first inductance (L)11) And a first switch tube (S)11) First inductance (L)11) One end of the first inductor is connected with the positive electrode of the power supply11) Is connected with the first switch tube (S)11) Collector electrode of (1), first switching tube (S)11) The emitter of the anode is connected with the cathode of a power supply; the third leg (C) comprises a third inductance (L)21) And a third switching tube (S)21) The structure of the third bridge arm (C) is the same as that of the first bridge arm (A), and the connection mode of the third bridge arm (C) and a power supply is the same as that of the first bridge arm (A); the second leg (B) comprises a second inductance (L)12) And a second switching tube (S)12) A second switch tube (S)12) Is connected with the positive pole of the power supply, and a second switch tube (S)12) Is connected to the second inductor (L)12) One terminal of (a) a second inductance (L)12) The other end of the power supply is connected with the negative electrode of the power supply; the fourth leg (D) comprises a fourth inductance (L)22) And a fourth switching tube (S)22) The structure of the fourth bridge arm (D) is the same as that of the second bridge arm (B), and the connection mode with a power supply is the same as that of the second bridge arm (B);
a first diode (D)1) Is connected with a first switch tube (S)11) Collector electrode of, the first diode (D)1) Is connected to a first capacitor (C)1) One terminal of (C), a first capacitor (C)1) Is connected with a second switch tube (S)12) The emission set of (1); second diode (D)2) The cathode of the first switch tube is connected with the fourth switch tube (S)22) An emitter of, a second diode (D)2) Is connected to a second capacitor (C)2) One terminal of (C), a second capacitor (C)2) The other end of the first switch tube is connected with a third switch tube (S)21) A collector electrode of (a);
filter inductor (L)3) Is connected to a first diode (D)1) Cathode of (2), filter inductor (L)3) Is connected with a filter capacitor (C)3) Positive electrode of (2), filter capacitor (C)3) Is connected to the second diode (D)2) Of (2) an anode.
2. A DC/DC converter circuit according to claim 1, wherein: filter capacitor (C)3) Output voltage u at both endsoSatisfies the following conditions:
Figure FDA0002614470800000011
wherein u isinIs the power supply input voltage and D is the steady state duty cycle.
3. A DC/DC converter circuit according to claim 1 or 2, wherein: the first switch tube (S)11) A second switch tube (S)12) And a third switching tube (S)21) And a fourth switching tube (S)22) All are full-control power electronic switching devices and are equipped with a switching tube driving module.
4. A DC/DC converter circuit according to any one of claims 1 to 3, wherein: a first switch tube (S)11) A second switch tube (S)12) And a third switching tube (S)21) And a fourth switching tube (S)22) With the same duty ratio, a first switching tube (S)11) A second switch tube (S)12) In synchronization with the drive pulse of the third switching tube (S)21) And a fourth switching tube (S)22) Is synchronized.
5. A DC/DC converter circuit according to claim 4, characterized in that: a first switch tube (S)11) And a third switching tube (S)21) Are different from each other by a phase angle of 180 deg..
6. A DC/DC converter circuit according to claim 1 or 2, wherein: a first capacitor (C)1) And a second capacitance (C)2) All have polar capacitance, the first capacitance (C)1) Is connected with a first diode (D)1) A first capacitor (C)1) Is connected with the second switch tube (S)12) The emission set of (1); a second capacitance (C)2) The anode of the second switch tube is connected with a third switch tube (S)21) Collector electrode of, the second capacitance (C)2) Is connected to the second diode (D)2) Of (2) an anode.
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WO2015176582A1 (en) * 2014-07-01 2015-11-26 深圳市长昊机电有限公司 Dc/dc boost conversion module and circuit
CN107104597A (en) * 2017-05-27 2017-08-29 燕山大学 High step-up ratio suspend interlock three level DC/DC converters and its control method
CN108400709A (en) * 2018-03-09 2018-08-14 燕山大学 A kind of two-way DC/DC converters of integrated three level of bipolarity of crisscross parallel magnetic
CN108631603A (en) * 2018-05-25 2018-10-09 哈尔滨工程大学 A kind of control method that the DC bus-bar voltage oscillation based on full-bridge converter inhibits
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WO2001050583A1 (en) * 2000-01-05 2001-07-12 Ascom Energy Systems Ag Three phase-electrical intermediate circuit having reduced network feedback-identical pulse-director system with a wide positioning range pertaining to the output voltage
WO2015176582A1 (en) * 2014-07-01 2015-11-26 深圳市长昊机电有限公司 Dc/dc boost conversion module and circuit
CN105006965A (en) * 2015-07-27 2015-10-28 盐城工学院 Single-tube high-gain DC step-up conversion circuit
CN107104597A (en) * 2017-05-27 2017-08-29 燕山大学 High step-up ratio suspend interlock three level DC/DC converters and its control method
CN108400709A (en) * 2018-03-09 2018-08-14 燕山大学 A kind of two-way DC/DC converters of integrated three level of bipolarity of crisscross parallel magnetic
CN108631603A (en) * 2018-05-25 2018-10-09 哈尔滨工程大学 A kind of control method that the DC bus-bar voltage oscillation based on full-bridge converter inhibits
CN109921638A (en) * 2019-03-11 2019-06-21 福州大学 A kind of biswitch high step-up ratio DC converter

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