CN211405866U - Buck-boost direct current conversion circuit - Google Patents
Buck-boost direct current conversion circuit Download PDFInfo
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- CN211405866U CN211405866U CN201922039434.3U CN201922039434U CN211405866U CN 211405866 U CN211405866 U CN 211405866U CN 201922039434 U CN201922039434 U CN 201922039434U CN 211405866 U CN211405866 U CN 211405866U
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Abstract
The utility model provides a buck-boost direct current converting circuit, including switch S1, switch S2, diode D1, diode D2, diode D3, electric capacity C1, electric capacity C2, inductance L1, inductance L2, inductance L3 and load resistance Ro, wherein, electric capacity C1 and inductance L1 have constituted power supply side LC filter circuit. The utility model has the characteristics of the circuit is simple, the inductance bears that electrical stress is low, output EMI is lighter, and low cost simultaneously, the inductance can work in intermittent electric conduction mode, and series charging and parallelly connected discharge, output voltage can rise the degradable. Due to the adoption of input LC filtering, a flat input current can be obtained, and EMI interference is reduced.
Description
Technical Field
The utility model relates to a DC-DC converter in power electronic transformation technical field specifically relates to a step-up and step-down DC converting circuit.
Background
The BUCK DC-DC conversion circuit and the BOOST DC-DC conversion circuit can be combined to obtain the BUCK-BOOST DC-DC conversion circuit, the voltage transformation ratio is d/(1-d), and d is the chopping duty ratio of a power switch in the circuit.
The BUCK-BOOST DC-DC conversion circuit only adopts a main inductor for voltage boosting and reducing, and the electrical stress borne by the inductor is large. Meanwhile, the input current of the BUCK DC-DC conversion circuit is discontinuous, and strong EMI can be generated. The inductor generally operates in a Continuous Conduction Mode (CCM) and does not operate in a Discontinuous Conduction Mode (DCM) or a critical conduction mode (CRM). If the inductor can work under DCM or CRM, the magnetic core utilization rate is highest, saves magnetic part design cost.
Therefore, there is a need in the art to design a BUCK-BOOST DC-DC converter circuit with low electrical stress on the inductor, low EMI at the input end, and high core utilization.
At present, no explanation or report similar to the technology of the utility model is found, and similar data at home and abroad are not collected yet.
SUMMERY OF THE UTILITY MODEL
The above-mentioned not enough to the existence among the prior art, the utility model aims at providing a buck-boost direct current conversion circuit, this circuit adopt double inductance and double diode to constitute hybrid bridge and input LC filter structure, have the inductance and bear the purpose of advantages such as electric stress is low, input EMI is lighter.
The utility model discloses a realize through following technical scheme.
A buck-boost direct current conversion circuit comprises power switches S1 and S2, diodes D1-D3, capacitors C1 and C2, inductors L1-L3 and a load resistor Ro; wherein:
one end of the inductor L1 is connected with an input direct current power supply anode, the other end of the inductor L1 is connected with a collector of the power switch S1 and one end of the capacitor C1, an emitter of the power switch S1 is connected with one end of the inductor L2 and a cathode of the diode D1, the other end of the capacitor C1 is connected with an input direct current power supply cathode and is connected with an anode of the diode D2 and one end of the inductor L3, the other end of the inductor L2 is connected with a cathode of the diode D2 and then is connected with a collector of the power switch S2 and an anode of the diode D3, an anode of the diode D1 and the other end of the inductor L3 are connected with an emitter of the power switch S2 and a cathode of the capacitor C2 to form an output direct current cathode, a cathode of the diode D3 is connected with an anode of the capacitor C2 to form an output direct current anode, one end of the load resistor Ro is connected with the output direct current anode, and the other end of the load resistor, the inductor L1 and the capacitor C1 form a power supply side LC filter circuit.
Preferably, the capacitor C1 is a filter capacitor, and the value range is within 1 μ F.
Preferably, the capacitor C2 is an energy storage capacitor.
Preferably, the power switch S1 and the power switch S2 are both chopper switches.
Preferably, the power switch S1 is an IGBT or a power MOSFET.
Preferably, the power switch S2 is an IGBT or a power MOSFET.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the utility model provides a buck-boost direct current conversion circuit, through set up single power-on resistance (load resistance Ro) in the circuit, realize buck-boost DC-DC conversion, the voltage transformation ratio is d/2(1-d), main inductive electrical stress descends;
(2) the utility model provides a buck-boost direct current conversion circuit through only go up electric resistance (load resistance Ro) in setting up the circuit, realizes that input current is straight in succession, and net side EMI level is lighter.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a topological diagram of a buck-boost dc conversion circuit provided in an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
The embodiment of the utility model provides a buck-boost direct current converting circuit, including power switch S1 and S2, diode D1 ~ D3, electric capacity C1 and C2, inductance L1 ~ L3 and load resistance Ro. Wherein:
one end of the inductor L1 is connected with the positive pole of the input direct current power supply, the other end of the inductor L1 is connected with the collector of the power switch S1 and one end of the capacitor C1, the emitter of the power switch S1 is connected with one end of the inductor L2 and the cathode of the diode D2, the other end of the capacitor C1 is connected with the negative pole of the input direct current power supply, and is connected with the anode of the diode D2 and one end of the inductor L3, after the other end of the inductor L2 is connected with the cathode of the diode D2, after the collector of the power switch S2 is connected to the anode of the diode D3, the anode of the diode D1 is connected to the other end of the inductor L3, the output direct current positive pole + is formed by connecting the emitter of the power switch S2 and the negative pole of the capacitor C2, the cathode of the diode D3 is connected with the positive pole of the capacitor C2, one end of the load resistor Ro is connected with the output direct current positive pole, and the other end of the load resistor Ro is connected with the output direct current negative pole.
The inductor L1 and the capacitor C1 form a power supply side LC filter circuit.
The embodiment of the utility model provides a buck-boost direct current conversion circuit, its theory of operation as follows:
the power switches S1 and S2 have the same driving signal and are turned on and off simultaneously. When the power switches S1 and S2 are turned on simultaneously, the inductors L1 and L2 are connected in series equivalently, the voltage stress is reduced, the current rises and stores energy under the action of the input voltage, and the diode D3 is responsible for blocking the energy backflow of the capacitor C2. When the power switches S1 and S2 are turned off simultaneously, the inductor L1 is equivalently connected in parallel with L2, the current drops to zero and the energy is released. The power switch S1 current assumes an intermittent state. The inductor L1 and the capacitor C1 form a power supply side LC filter circuit, the capacitor C1 bypasses high-frequency ripple current, and the inductor L1 blocks the high-frequency ripple current to obtain straight input current.
The utility model discloses among the step-up and step-down DC conversion circuit that above-mentioned embodiment provided, each electronic components's lectotype is as follows:
fs: the switching frequency of the power switches S1 and S2 is 40kHz or higher;
l1: a filter inductor;
l2 and L3: ensuring the work in DCM state under full load;
c1: a filter capacitance of within 1 muH;
c2: the value of the energy storage capacitor determines the power grade, and the higher the power grade or the higher the switching frequency, the smaller the value;
s1 and S2: the chopper switch adopts IGBT or power MOSFET, and the voltage resistance and current resistance grade depend on design parameters;
the utility model discloses above-mentioned embodiment provides a Buck-Boost direct current converting circuit, including two power switch, three diodes, two electric capacity, three inductance and a load resistance, constitute a Buck-Boost converting circuit. The utility model has the characteristics of the circuit is simple, the inductance bears that electrical stress is low, output EMI is lighter, and low cost simultaneously, two inductances (L2 and L3) can only work at DCM or CRM, and two inductances are established ties and are charged and parallelly connected discharge, and output voltage can rise the degradable, and the magnetic core utilization ratio is higher. Due to the adoption of input LC filtering, a flat input current can be obtained, and EMI interference is reduced.
The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (6)
1. A buck-boost direct current conversion circuit is characterized by comprising a power switch S1, a power switch S2, a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2, an inductor L1, an inductor L2, an inductor L3 and a load resistor Ro; wherein:
one end of the inductor L1 is connected with the positive electrode of an input direct-current power supply, and the other end of the inductor L1 is connected with the collector of the power switch S1 and one end of the capacitor C1;
the emitter of the power switch S1 is connected with one end of an inductor L2 and the cathode of a diode D1;
the other end of the capacitor C1 is connected with the cathode of the input direct-current power supply and is connected with the anode of the diode D2 and one end of the inductor L3;
the other end of the inductor L2 is connected with the cathode of the diode D2 and then connected with the collector of the power switch S2 and the anode of the diode D3;
the anode of the diode D1 is connected with the other end of the inductor L3 and then connected with the emitter of the power switch S2 and the cathode of the capacitor C2 to form an output direct current cathode;
the cathode of the diode D3 is connected with the anode of the capacitor C2 to form an output direct current anode;
one end of the load resistor Ro is connected with an output direct current positive electrode, and the other end of the load resistor Ro is connected with an output direct current negative electrode;
the inductor L1 and the capacitor C1 form a power supply side LC filter circuit.
2. The buck-boost direct-current conversion circuit according to claim 1, wherein the capacitor C1 is a filter capacitor and has a value within 1 μ F.
3. The buck-boost dc conversion circuit according to claim 1, wherein the capacitor C2 is an energy storage capacitor.
4. The buck-boost dc converter circuit according to claim 1, wherein the power switch S1 and the power switch S2 are chopper switches.
5. The buck-boost DC conversion circuit according to claim 4, wherein the power switch S1 is IGBT or power MOSFET.
6. The buck-boost DC conversion circuit according to claim 4, wherein the power switch S2 is IGBT or power MOSFET.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922039434.3U CN211405866U (en) | 2019-11-23 | 2019-11-23 | Buck-boost direct current conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922039434.3U CN211405866U (en) | 2019-11-23 | 2019-11-23 | Buck-boost direct current conversion circuit |
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| Publication Number | Publication Date |
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| CN211405866U true CN211405866U (en) | 2020-09-01 |
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| CN201922039434.3U Active CN211405866U (en) | 2019-11-23 | 2019-11-23 | Buck-boost direct current conversion circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114172374A (en) * | 2021-12-20 | 2022-03-11 | 广东工业大学 | Cross flying capacitor hybrid boost-buck DC-DC converter based on double inductors |
| CN115664211A (en) * | 2022-12-14 | 2023-01-31 | 惠州市乐亿通科技有限公司 | DC/DC converter and power supply device |
-
2019
- 2019-11-23 CN CN201922039434.3U patent/CN211405866U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114172374A (en) * | 2021-12-20 | 2022-03-11 | 广东工业大学 | Cross flying capacitor hybrid boost-buck DC-DC converter based on double inductors |
| CN114172374B (en) * | 2021-12-20 | 2022-08-09 | 广东工业大学 | Cross flying capacitor hybrid boost-buck DC-DC converter based on double inductors |
| CN115664211A (en) * | 2022-12-14 | 2023-01-31 | 惠州市乐亿通科技有限公司 | DC/DC converter and power supply device |
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