CN111987902B - DC/DC converter circuit - Google Patents
DC/DC converter circuit Download PDFInfo
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- CN111987902B CN111987902B CN202010765631.8A CN202010765631A CN111987902B CN 111987902 B CN111987902 B CN 111987902B CN 202010765631 A CN202010765631 A CN 202010765631A CN 111987902 B CN111987902 B CN 111987902B
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- capacitor
- switch tube
- tube
- switching tube
- bridge arm
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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, in which a power supply and a first inductor (L 11 ) Second inductor (L) 12 ) Third inductance (L) 21 ) Fourth inductance (L) 22 ) And filter inductance (L) 3 ) A first capacitor (C 1 ) A second capacitor (C 2 ) And filter capacitor (C) 3 ) First switch tube (S) 11 ) Second switch tube (S) 12 ) Third switch tube (S) 21 ) And a fourth switching tube (S) 22 ) First diode (D 1 ) And a second diode (D 2 ) And (5) connecting the two components with each other. The invention can output voltage u in the traditional boost converter under the condition of continuous inductive current o For input voltage u in Is defined by the boost ratio ofLifted toD is a steady duty ratio, and the low-voltage power supply is connected into a high-voltage system or is converted into high-voltage power required by meeting the load.
Description
Technical Field
The invention relates to a DC/DC converter circuit, in particular to a DC/DC converter circuit with high voltage boosting capability, and belongs 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 connected to a high-voltage direct-current power grid for load use in general. Although the conventional boost dc converter has infinite boost capability if the voltage drop loss of the line impedance is theoretically ignored, the line loss increases with the load, and the boost capability of the conventional boost dc converter reaches a limit. For systems of larger capacity, in particular systems with high current characteristics at low voltage on the power supply side, it is therefore often necessary in practice to switch the low voltage power supply to the high voltage system or to convert the low voltage power supply to the high voltage power required for the load via a DC/DC converter with a high step-up ratio.
Disclosure of Invention
Aiming at the prior art, the invention aims to provide a combined DC/DC converter circuit with remarkable high boosting capability, which realizes that a low-voltage power supply is connected into a high-voltage system or converts the low-voltage power supply into high-voltage power required by a load.
In order to solve the above technical problems, a DC/DC converter circuit of the present invention includes: the first bridge arm A, the second bridge arm B, the third bridge arm C and the fourth bridge arm D; the first bridge arm A comprises a first inductance L 11 And a first switching tube S 11 First inductance L 11 One end is connected with the positive electrode of the power supply, the first inductance L 11 The other end of (a) is connected with a first switch tube S 11 Collector of the first switching tube S 11 The emitter of which is connected with the cathode of the power supply; the third bridge arm C comprises a third inductance L 21 And a third switching tube S 21 The third bridge arm C has the same structure as the first bridge arm A and the same connection mode with the power supply as the first bridge arm A; the second bridge arm B comprises a second inductance L 12 And a second switching tube S 12 Second switch tube S 12 The collector of (a) is connected with the positive electrode of the power supply, and a second switch tube S 12 The emitter of (a) is connected with the second inductance L 12 One end of the second inductance L 12 The other end of the battery is connected with the negative electrode of the power supply; the fourth bridge arm 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 of the fourth bridge arm D and the power supply is the same as that of the second bridge arm B;
first diode D 1 Is connected with the first switch tube S 11 Collector of first diode D 1 Is connected with the first capacitor C 1 Is a first capacitor C 1 The other end of (a) is connected with a second switch tube S 12 Is a set of emissions of (1); second diode D 2 Is connected with a fourth switching tube S 22 Emitter of second diode D 2 Is connected with the second capacitor C 2 One end of the second capacitor C 2 The other end of (a) is connected with a third switch tube S 21 A collector electrode of (a);
filter inductance L 3 One end of (a) is connected with a first diode D 1 Cathode of filter inductance L 3 The other end of (a) is connected with a filter capacitor C 3 Positive electrode of (C) filter capacitor 3 Is connected with the cathode of the second diode D 2 An anode of (a);
the invention also includes:
1. filter capacitor C 3 Output voltage u at both ends o The method meets the following conditions:
wherein u is in For the power supply input voltage, D is the steady state duty cycle.
2. First switching tube S 11 Second switch tube S 12 Third switch tube S 21 And a fourth switching tube S 22 All are fully controlled power electronic switching devices and are provided with switching tube driving modules.
3. First switching tube S 11 Second switch tube S 12 Third switch tube S 21 And a fourth switching tube S 22 With the same duty cycle, a first switching tube S 11 Second switch tube S 12 Is synchronized with the driving pulse of the third switching tube S 21 And a fourth switching tube S 22 Is synchronized with the driving pulse of (a).
4. First switching tube S 11 And a third switching tube S 21 Is 180 deg. phase angle from each other.
5. First capacitor C 1 And a second capacitor C 2 All have polar capacitance, the first capacitance C 1 Is connected with the first diode D 1 Cathode of the first capacitor C 1 Is connected with a second switch tube S 12 Is a set of emissions of (1); second capacitor C 2 Is connected with a third switch tube S 21 Collector of (C) a second capacitor C 2 Is connected with the cathode of the second diode D 2 Is a positive electrode of (a).
The invention has the beneficial effects that: the present invention provides a DC/DC converter circuit with high boost capability capable of providing an output voltage (u o ) For input voltage (u) in ) Is defined by the boost ratio of(D is steady-state duty cycle) is raised to +.>When the duty ratio is D>After 0.2 times, the DC/DC converter designed by the invention can obtain more than 2 times of boosting capability, 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 a 10-fold boost capability, whereas the DC/DC converter of the present invention has a 37-fold boost capability. Whereas the conventional boost converter has a 20-fold boost capability when D is taken to be 0.95, the DC/DC converter of the present invention has a 73-fold boost capability.
Drawings
FIG. 1 is a DC/DC converter circuit with high boost capability of the present invention;
fig. 2 is a graph comparing boost capability of the DC/DC converter of the present invention with that of a conventional boost converter.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings.
An object of the present invention is to provide a DC/DC converter circuit having a high boost capability, comprising: input power u in circuit in Inductance element L 11 、L 12 、L 21 And L 22 Capacitor element C 1 、C 2 And C 3 Diode element D 1 And D 2 Switching device S 11 、S 12 、S 21 And S is 22 And the interconnection relationship between the loads R, the inductance element L 11 、L 12 、L 21 And L 22 Diode element D is the same inductance element 1 And D 2 Is the same diode, switching device S 11 、S 12 、S 21 And S is 22 Capacitor element C being the same switching tube 1 、C 2 Is the same capacitance.
Referring to fig. 1, the DC/DC converter of the present invention is implemented by using any other fully-controlled power electronic switching device as the switching transistor in the embodiment of the present invention, which is an IGBT:
(1) Inductance L 11 And a switch tube S 11 Are connected in series to form bridge arms A, L 11 And S is equal to 11 The connection point of (a) is the collector of the switching tube (as the midpoint p of the bridge arm A in the figure 4 A dot); inductance L 12 And a switch tube S 12 Are connected in series to form bridge arm B, L 12 And S is equal to 12 The junction point of (a) is the emitter of the switching tube (the midpoint p of the bridge arm B in the figure 9 A dot);
(2) Connecting a bridge arm A and a bridge arm B in parallel, wherein an inductance L in the bridge arm A 11 The other end (p) 3 Point) is connected with the collector electrode of the switching tube in the bridge arm B; the emitter (p) of the switch tube in the bridge arm A 5 Point) and inductance L in leg B 12 The other end of the first connecting piece is connected with the other end of the second connecting piece;
(3) Two common points of two bridge arms after connecting the bridge arm A and the bridge arm B in parallel are shown as p in the figure 3 Point and p 5 The points are respectively connected with a power supply u in Positive electrode (p) 1 Dot) and anode (p) 2 Points) are connected together;
(4) One diode D 1 Is connected to the middle point (p 4 Point), a capacitor C 1 Respectively with diode D 1 Cathode (p) 11 Point) and the midpoint (p) of leg B 9 Point) are connected together, if the capacitor C 1 For having polar capacitance, C 1 The positive electrode of (C) should be equal to D 1 Is of (2)Pole connection, C 1 The negative electrode of the bridge arm B is connected with the middle point of the bridge arm B; if the capacitance C 1 Is a nonpolar capacitor, C 1 And D at either end of (2) 1 Cathode connection of C 1 The other end of the bridge arm B is connected with the middle point of the bridge arm B;
(5) Inductance L 21 And a switch tube S 21 The bridge arm C which is identical to the bridge arm A in series connection is formed, wherein the point is denoted by p 7 A dot; inductance L 22 And a switch tube S 22 Bridge arm D, which is identical to bridge arm B in series configuration and is denoted by p 10 A dot;
(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 after the two bridge arms are connected in parallel are respectively a switch tube S in a bridge arm C 21 Emitter (P) 8 Point) and switching tube S in bridge arm D 22 Collector (P) of (a) 6 Point (C)
(7) Two common points after connecting bridge arm C and bridge arm D in parallel are shown as p in the figure 6 Point and p 8 The points are respectively connected with a power supply u in Positive electrode (p) 1 Dot) and anode (p) 2 Points) are connected together;
(8) One diode D 2 Is connected to the middle point (p 10 Point), a capacitor C 2 Respectively with diode D 2 Anode (p) 12 Point) and the midpoint (p) of leg C 7 Point) are connected together, if the capacitor C 2 For having polar capacitance, C 2 The negative electrode of (C) should be equal to D 2 Is connected with the anode of C 2 The positive electrode of the bridge arm C is connected with the middle point of the bridge arm C; if the capacitance C 2 Is a nonpolar capacitor, C 2 And D at either end of (2) 2 Is connected with the anode of C 2 The other end of the bridge arm C is connected with the middle point of the bridge arm C;
(9) An inductance L for filtering 3 And diode D 1 Cathode (p) 11 Point) connection, L 3 The other end (p) 13 Point) and a filter capacitor C 3 The anodes of (a) are connected together; capacitor C 3 The other end (p) 14 Point) and diode D 2 Anode (p) 12 Point) is connected toTogether; a load (such as a resistor R in the figure) is connected to the capacitor C 3 Both ends (p) 13 Point and p 14 Point, p 13 Point polarity is positive, p 14 Point polarity negative);
(10) Switch tube S in the circuit 11 、S 12 、S 21 And S is 22 With the same duty cycle. And S is 11 And S is 12 Is synchronized with the driving pulse of the driving circuit; s is S 21 And S is 22 Is synchronized with the driving pulse of the driving circuit;
(11) When S is 11 And S is 12 When conducting, inductance L 11 And inductance L 12 From power supply u in Charging capacitor C 1 Supplying power to the load; when S is 11 And S is 12 When turned off, the inductance L 11 And inductance L 12 And power supply u in Together via diode D 1 Give electric capacity C 1 Charging and simultaneously supplying the load, capacitor C 1 Average voltage overMultiple input voltage (u) in )。
(12) When S is 21 And S is 22 When conducting, inductance L 21 And inductance L 22 From power supply u in Charging capacitor C 2 Supplying power to the load; when S is 21 And S is 22 When turned off, the inductance L 21 And inductance L 22 And power supply u in Together via diode D 2 Give electric capacity C 2 Charging and simultaneously supplying the load, capacitor C 2 Average voltage overMultiple input voltage (u) in )。
(13) Under the condition that inductance current of each bridge arm is continuous, p 11 And p 12 The voltage between the two points passes through the inductance L 3 Capacitor C 3 Filtering to obtain a stable output voltage (u o ) Is thatDouble transfusionVoltage (u) in ). I.e. the DC/DC converter output voltage (u o ) For input voltage (u) in ) The step-up ratio of (2) can be up to +.>
(14) To reduce the supply current (i in ) Pulse quantity of (2) at S 11 And S is 12 Drive pulse synchronization of (2) and S 21 And S is 22 Under the condition of synchronous driving pulse, S can be made 11 And S is equal to 21 Is 180 deg. phase angle from each other.
Claims (6)
1. A DC/DC converter circuit, comprising: a first leg (A), a second leg (B), a third leg (C) and a fourth leg (D); the first leg (A) comprises a first inductance (L 11 ) And a first switching tube (S 11 ) First inductor (L 11 ) One end is connected with the positive electrode of the power supply, and the first inductor (L 11 ) The other end of the first switch tube is connected with a first switch tube (S 11 ) Is connected with the collector of the first switching tube (S 11 ) The emitter of which is connected with the cathode of the power supply; the third leg (C) comprises a third inductance (L 21 ) And a third switching tube (S) 21 ) The third bridge arm (C) has the same structure as the first bridge arm (A) and the same connection mode with the power supply as the first bridge arm (A); the second leg (B) comprises a second inductance (L 12 ) And a second switching tube (S 12 ) Second switch tube (S) 12 ) The collector of (a) is connected with the positive electrode of the power supply, and a second switching tube (S 12 ) Is connected to the second inductor (L 12 ) Is arranged at one end of the second inductor (L 12 ) The other end of the battery 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 fourth bridge arm (D) has the same structure as the second bridge arm (B) and the same power supply connection mode as the second bridge arm (B);
first diode (D) 1 ) Is connected with the anode of the first switch tube (S 11 ) Is arranged in the first diode (D) 1 ) Is connected to the cathode of the first capacitor (C 1 ) Is arranged at one end of the first capacitor (C 1 ) Is connected with the second endSwitch tube (S) 12 ) Is a set of emissions of (1); second diode (D) 2 ) Is connected with the fourth switching tube (S) 22 ) Emitter of the second diode (D 2 ) Is connected with the anode of the second capacitor (C 2 ) Is arranged at one end of the second capacitor (C 2 ) The other end of the switch is connected with a third switch tube (S 21 ) A collector electrode of (a);
filter inductor (L) 3 ) One end of (C) is connected with a first diode (D 1 ) Is a cathode of a filter inductance (L 3 ) The other end of (C) is connected with a filter capacitor (C) 3 ) Is a positive electrode of (C) 3 ) Is connected with the cathode of the second diode (D 2 ) Is a positive electrode of (a).
2. A DC/DC converter circuit according to claim 1, characterized in that: filter capacitor (C) 3 ) Output voltage u at both ends o The method meets the following conditions:
wherein u is in For the power supply input voltage, D is the steady state duty cycle.
3. A DC/DC converter circuit according to claim 1 or 2, characterized in that: the first switching tube (S 11 ) Second switch tube (S) 12 ) Third switch tube (S) 21 ) And a fourth switching tube (S) 22 ) All are fully controlled power electronic switching devices and are provided with switching tube driving modules.
4. A DC/DC converter circuit according to any one of claims 1 to 2, characterized in that: first switch tube (S) 11 ) Second switch tube (S) 12 ) Third switch tube (S) 21 ) And a fourth switching tube (S) 22 ) With the same duty cycle, the first switching tube (S 11 ) Second switch tube (S) 12 ) Is synchronized with the driving pulse of the third switching tube (S 21 ) And a fourth switching tube (S) 22 ) Is synchronized with the driving pulse of (a).
5. A DC/DC converter circuit according to claim 4, characterized in that: first switch tube (S) 11 ) And a third switch tube (S) 21 ) Is 180 deg. phase angle from each other.
6. A DC/DC converter circuit according to claim 1 or 2, characterized in that: first capacitor (C) 1 ) And a second capacitor (C 2 ) Are all polar capacitors, the first capacitor (C 1 ) The positive electrode of (C) is connected with a first diode (D 1 ) Is a cathode of a first capacitor (C 1 ) Is connected with a second switch tube (S) 12 ) Is a set of emissions of (1); second capacitor (C) 2 ) Is connected with a third switch tube (S) 21 ) Is arranged in the second capacitor (C) 2 ) Is connected with the cathode of the second diode (D 2 ) Is a positive electrode of (a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010765631.8A CN111987902B (en) | 2020-08-03 | 2020-08-03 | DC/DC converter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010765631.8A CN111987902B (en) | 2020-08-03 | 2020-08-03 | DC/DC converter circuit |
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| Publication Number | Publication Date |
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| CN111987902A CN111987902A (en) | 2020-11-24 |
| CN111987902B true CN111987902B (en) | 2023-09-19 |
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| CN202010765631.8A Active CN111987902B (en) | 2020-08-03 | 2020-08-03 | DC/DC converter circuit |
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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 |
| CN105006965A (en) * | 2015-07-27 | 2015-10-28 | 盐城工学院 | Single-tube high-gain DC step-up conversion circuit |
| 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 |
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| 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 |
-
2020
- 2020-08-03 CN CN202010765631.8A patent/CN111987902B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| 耦合电感升压变换器开关管应力降低的研究;石林林;祝龙记;朱红;;广西师范大学学报(自然科学版)(第02期);全文 * |
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