CN211791275U - Cascaded buck-boost DC-DC converter - Google Patents
Cascaded buck-boost DC-DC converter Download PDFInfo
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- CN211791275U CN211791275U CN201821850716.0U CN201821850716U CN211791275U CN 211791275 U CN211791275 U CN 211791275U CN 201821850716 U CN201821850716 U CN 201821850716U CN 211791275 U CN211791275 U CN 211791275U
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Abstract
A cascaded boost-buck DC-DC converter comprises an inductor L1, 1 boost-type capacitance-inductance energy storage module, 1 buck-type capacitance-inductance energy storage module and a capacitor Co, wherein the boost-type capacitance-inductance energy storage module comprises a diode Da _1, a capacitor Ca _1, an inductor La _1 and an electronic switch Sa, the buck-type capacitance-inductance energy storage module comprises a diode Db _1, a capacitor Cb _1, a diode Db _2, an inductor Lb _1 and an electronic switch Sb, the electronic switch Sa comprises a diode Da _2, an N-type MOS (metal oxide semiconductor) transistor Ma _1 and a controller a, and the electronic switch Sb comprises a diode Db _3, an N-type MOS transistor Mb _1 and a controller b. The utility model discloses has following operating characteristic: the circuit has simple structure and various applicable control methods, the input current and the output current are continuous, the output voltage and the input voltage are grounded and have consistent polarity, and the output voltage Vo is more than or less than or equal to the direct-current power supply voltage Vi.
Description
Technical Field
The utility model relates to a direct current-direct current (DC-DC) converter, especially an input and output current all are continuous and input and output voltage homopolar cascaded boost-buck type DC-DC converter can establish the direct current electrical power generating system of many inputs and many outputs as the basic unit, if: the system comprises a direct current power supply module parallel system, an LED array driving system, a distributed photovoltaic power generation system and the like.
Background
The existing basic DC-DC converter with the voltage boosting and reducing function comprises a Buck-Boost converter, a Cuk converter, a Sepic converter and a Zeta converter. As listed in table 1, none of the 4 basic DC-DC converters with buck-boost functions described above meet the requirement of "input and output currents are continuous and input and output voltages are of the same polarity" without considering the output capacitance.
TABLE 1
A mode of cascading a basic DC-DC converter is adopted, a Boost converter and a Buck converter are cascaded, a Boost-Buck DC-DC converter with continuous input and output currents and same input and output voltages in polarity can be obtained, but the problem of discontinuous current exists in the combination of the Boost-Buck DC-DC converter.
Disclosure of Invention
In order to overcome the current problem that the current is discontinuous inside the combination of Boost and Buck in the Boost-Buck DC-DC converter cascade scheme of "input and output current is all continuous and input and output voltage homopolarity", the utility model provides a cascaded Boost-Buck DC-DC converter can realize that input and output current are all continuous, stage current is still continuous and input and output are common ground to this kind of expanding Boost-Buck DC-DC converter.
The utility model provides a technical scheme that its technical problem adopted is:
a cascaded boost-buck DC-DC converter comprises an inductor L1, 1 boost-type capacitance-inductance energy storage module, 1 buck-type capacitance-inductance energy storage module and a capacitor Co, wherein the boost-type capacitance-inductance energy storage module is provided with a port Via +, a port Voa + and a port Gnda, the buck-type capacitance-inductance energy storage module is provided with a port Vib +, a port Vob + and a port Gndb, one end of the capacitor Co is connected with one end of a load Z, the other end of the load Z is simultaneously connected with the other end of the capacitor Co, the negative end of a direct-current power supply Vi, the port Gnda of the boost-type capacitance-inductance energy storage module and the port Gndb of the buck-type capacitance-inductance energy storage module, and the rest parts of the boost-type capacitance-inductance energy storage module and the buck-capacitance-inductance energy storage module and an inductor L1 are positioned between the;
the boost type capacitance and inductance energy storage module comprises a diode Da _1, a capacitor Ca _1, an inductor La _1 and an electronic switch Sa, wherein the electronic switch Sa is provided with a port c and a port d, the anode of the diode Da _1 is simultaneously connected with the port Via + of the boost type capacitance and inductance energy storage module and the port c of the electronic switch Sa, the cathode of the diode Da _1 is simultaneously connected with one end of the capacitor Ca _1 and the port Voa + of the boost type capacitance and inductance energy storage module, the port d of the electronic switch Sa is simultaneously connected with the other end of the capacitor Ca _1 and one end of the inductor La _1, and the other end of the inductor La _1 is connected with the port Gnda of the boost type capacitance and inductance energy storage module;
the voltage-reducing type capacitance-inductance energy storage module comprises a diode Db _1, a capacitor Cb _1, a diode Db _2, an inductor Lb _1 and an electronic switch Sb, wherein the electronic switch Sb is provided with a port e and a port f, one end of the capacitor Cb _1 is simultaneously connected with the port Vib + of the voltage-reducing type capacitance-inductance energy storage module and the port e of the electronic switch Sb, the other end of the capacitor Cb _1 is simultaneously connected with the anode of the diode Db _1 and one end of the inductor Lb _1, the cathode of the diode Db _1 is simultaneously connected with the port Vob + of the voltage-reducing type capacitance-inductance energy storage module and the port f of the electronic switch Sb, the other end of the inductor Lb _1 is connected with the cathode of the diode Db _2, and the anode of the diode Db _2 is connected with the port Gndb of.
One preferred connection is: the port Via + of the boost capacitor inductor energy storage module is connected with the positive end of a direct current power supply Vi, the port Voa + of the boost capacitor inductor energy storage module is connected with one end of an inductor L1, the other end of the inductor L1 is connected with the port Vib + of the buck capacitor inductor energy storage module, and the port Vob + of the buck capacitor inductor energy storage module is connected with one end of a capacitor Co.
When the electronic switch Sa is turned off, the diode Da _1 is turned on, the direct-current power supply Vi, the diode Da _1, the inductor L1 and the buck capacitor-inductor energy storage module form a loop, and the direct-current power supply Vi, the diode Da _1, the capacitor Ca _1 and the inductor La _1 form another loop.
When the electronic switch Sa is switched on, the diode Da _1 is switched off, the direct-current power supply Vi, the electronic switch Sa and the inductor La _1 form a loop, and the direct-current power supply Vi, the electronic switch Sa, the capacitor Ca _1, the inductor L1 and the buck capacitor-inductor energy storage module form another loop.
When the electronic switch Sb is turned off, the diode Db _1 is turned on, the boost capacitor-inductor energy storage module, the inductor L1, the capacitor Cb _1, the diode Db _1, the capacitor Co and the load Z form a loop, and the diode Db _2, the inductor Lb _1, the diode Db _1, the capacitor Co and the load Z form another loop.
When the electronic switch Sb is turned on, the diode Db _1 is turned off, the boost capacitor inductor energy storage module, the inductor L1, the electronic switch Sb, the capacitor Co and the load Z form a loop, and the diode Db _2, the inductor Lb _1, the capacitor Cb _1, the electronic switch Sb, the capacitor Co and the load Z form another loop.
Another preferred connection is: the port Vib + of the voltage reduction type capacitance inductance energy storage module is connected with the positive end of a direct current power supply Vi, the port Vob + of the voltage reduction type capacitance inductance energy storage module is connected with one end of an inductance L1, the other end of an inductance L1 is connected with the port Via + of the voltage boost type capacitance inductance energy storage module, and the port Voa + of the voltage boost type capacitance inductance energy storage module is connected with one end of a capacitance Co.
When the electronic switch Sb is turned off, the diode Db _1 is turned on, the dc power supply Vi, the capacitor Cb _1, the diode Db _1, the inductor L1 and the boost capacitor-inductor energy storage module form one loop, and the diode Db _2, the inductor Lb _1, the diode Db _1, the inductor L1 and the boost capacitor-inductor energy storage module form another loop.
When the electronic switch Sb is turned on, the diode Db _1 is turned off, the dc power supply Vi, the electronic switch Sb, the inductor L1, and the boost capacitor-inductor energy storage module form one loop, and the diode Db _2, the inductor Lb _1, the capacitor Cb _1, the electronic switch Sb, the inductor L1, and the boost capacitor-inductor energy storage module form another loop.
When the electronic switch Sa is turned off, the diode Da _1 is turned on, the buck capacitor-inductor energy storage module, the inductor L1, the diode Da _1, the capacitor Co and the load Z form a loop, and the buck capacitor-inductor energy storage module, the inductor L1, the diode Da _1, the capacitor Ca _1 and the inductor La _1 form another loop.
When the electronic switch Sa is turned on, the diode Da _1 is turned off, the buck capacitor-inductor energy storage module, the inductor L1, the electronic switch Sa and the inductor La _1 form a loop, and the buck capacitor-inductor energy storage module, the inductor L1, the electronic switch Sa, the capacitor Ca _1, the capacitor Co and the load Z form another loop.
Further, the electronic switch Sa is a one-way conducting electronic switch, that is, when the electronic switch Sa is conducting, the current flows into the port c and flows out of the port d; the electronic switch Sb is a one-way conducting electronic switch, that is, when the electronic switch Sb is conducting, the current flows in from the port e and flows out from the port f. This preference is to prevent current backflow.
The electronic switch Sa comprises a diode Da _2, an N-type MOS transistor Ma _1 and a controller a, the controller a has a port vga, an anode of the diode Da _2 is connected to a port c of the electronic switch Sa, a cathode of the diode Da _2 is connected to a drain of the N-type MOS transistor Ma _1, a source of the N-type MOS transistor Ma _1 is connected to a port d of the electronic switch Sa, and a gate of the N-type MOS transistor Ma _1 is connected to a port vga of the controller a.
The electronic switch Sb comprises a diode Db _3, an N-type MOS transistor Mb _1 and a controller b, the controller b has a port vgb, an anode of the diode Db _3 is connected with a port e of the electronic switch Sb, a cathode of the diode Db _3 is connected with a drain of the N-type MOS transistor Mb _1, a source of the N-type MOS transistor Mb _1 is connected with a port f of the electronic switch Sb, and a gate of the N-type MOS transistor Mb _1 is connected with the port vgb of the controller b.
The controller a determines the working state of the N-type MOS tube Ma _1, the controller b determines the working state of the N-type MOS tube Mb _1, and the controller a and the controller b both adopt power supply control chips.
Furthermore, the phases of the output signals vgsa and vgsb of the controller a and the controller b are sequentially delayed by a set angle θ, and the value range of θ is 0 to 2 pi.
The technical conception of the utility model is as follows: 1 inductor is adopted to cascade the boost capacitor inductor energy storage module and the buck capacitor inductor energy storage module, so that high-efficiency buck-boost conversion is realized, and continuous input current, continuous interstage current, continuous output current, common input and output ground and unchanged output voltage polarity are realized.
The beneficial effects of the utility model are that: the cascaded buck-boost DC-DC converter circuit is simple in structure, various in applicable control method and high in efficiency, input current and output current are continuous, output voltage and input voltage are grounded and consistent in polarity, and output voltage Vo is larger than or smaller than or equal to direct-current power supply voltage Vi.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is another circuit diagram of the present invention.
Fig. 3 is a timing diagram of signals output from the controller 1 to the controller n according to the present invention.
Fig. 4 is a waveform diagram of a simulation operation performed in embodiment 1 of the present invention under the condition where θ is 0.
Fig. 5 is a waveform diagram of simulation operation of embodiment 1 of the present invention under the condition of θ ═ pi.
Fig. 6 is a waveform diagram of simulation operation in the condition of θ being 0 according to embodiment 2 of the present invention.
Fig. 7 is a waveform diagram of simulation operation of embodiment 2 of the present invention under the condition of θ ═ pi.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Example 1
Referring to fig. 1 and 3 to 5, a cascaded buck-boost DC-DC converter includes an inductor L1, 1 boost capacitive-inductive energy storage module, 1 buck capacitive-inductive energy storage module and a capacitor Co, the boost capacitive-inductive energy storage module has a port Via +, a port Voa +, and a port Gnda, the buck capacitive-inductive energy storage module has a port Vib +, a port Vob +, and a port Gndb, one end of the capacitor Co is connected to one end of a load Z, the other end of the load Z is connected to the other end of the capacitor Co, the negative end of a DC power source Vi, the port Gnda of the boost capacitive-inductive energy storage module and the port Gndb of the buck capacitive-inductive energy storage module, the rest of the boost capacitive-inductive energy storage module and the buck capacitive-inductive energy storage module and an inductor L1 are located between the DC power source Vi and the capacitor Co and are in a series relationship, the port Via + of the boost capacitive-inductive energy storage module is connected to the positive end of the DC power source Vi, the port Voa + of the boost capacitor inductor energy storage module is connected with one end of an inductor L1, the other end of the inductor L1 is connected with the port Vib + of the buck capacitor inductor energy storage module, and the port Vob + of the buck capacitor inductor energy storage module is connected with one end of a capacitor Co.
The boost type capacitance and inductance energy storage module comprises a diode Da _1, a capacitor Ca _1, an inductor La _1 and an electronic switch Sa, wherein the electronic switch Sa is provided with a port c and a port d, the anode of the diode Da _1 is connected with the port Via + of the boost type capacitance and inductance energy storage module and the port c of the electronic switch Sa at the same time, the cathode of the diode Da _1 is connected with one end of the capacitor Ca _1 and the port Voa + of the boost type capacitance and inductance energy storage module at the same time, the port d of the electronic switch Sa is connected with the other end of the capacitor Ca _1 and one end of the inductor La _1 at the same time, and the other end of the inductor La _1 is connected with the port Gnda of the boost type.
The voltage-reducing type capacitance-inductance energy storage module comprises a diode Db _1, a capacitor Cb _1, a diode Db _2, an inductor Lb _1 and an electronic switch Sb, wherein the electronic switch Sb is provided with a port e and a port f, one end of the capacitor Cb _1 is simultaneously connected with the port Vib + of the voltage-reducing type capacitance-inductance energy storage module and the port e of the electronic switch Sb, the other end of the capacitor Cb _1 is simultaneously connected with the anode of the diode Db _1 and one end of the inductor Lb _1, the cathode of the diode Db _1 is simultaneously connected with the port Vob + of the voltage-reducing type capacitance-inductance energy storage module and the port f of the electronic switch Sb, the other end of the inductor Lb _1 is connected with the cathode of the diode Db _2, and the anode of the diode Db _2 is connected with the port Gndb of the.
Further, the electronic switch Sa is an electronic switch conducting in a single direction, that is, when the electronic switch Sa is conducting, the current flows into the port c and flows out of the port d; the electronic switch Sb is a one-way conductive electronic switch, that is, when the electronic switch Sb is turned on, current flows in from the port e and flows out from the port f.
Still further, the electronic switch Sa includes a diode Da _2, an N-type MOS transistor Ma _1, and a controller a, where the controller a has a port vga, an anode of the diode Da _2 is connected to the port c of the electronic switch Sa, a cathode of the diode Da _2 is connected to a drain of the N-type MOS transistor Ma _1, a source of the N-type MOS transistor Ma _1 is connected to the port d of the electronic switch Sa, and a gate of the N-type MOS transistor Ma _1 is connected to the port vga of the controller a.
The electronic switch Sb comprises a diode Db _3, an N-type MOS transistor Mb _1 and a controller b, the controller b has a port vgb, an anode of the diode Db _3 is connected with a port e of the electronic switch Sb, a cathode of the diode Db _3 is connected with a drain of the N-type MOS transistor Mb _1, a source of the N-type MOS transistor Mb _1 is connected with a port f of the electronic switch Sb, and a gate of the N-type MOS transistor Mb _1 is connected with the port vgb of the controller b.
The controller a determines the working state of the N-type MOS transistor Ma _1, the controller b determines the working state of the N-type MOS transistor Mb _1, and the controller a and the controller b both use conventional power control chips, for example: controller a may employ a combination of UC3842 and IR2110, etc., and controller b may employ UC3842, etc.
Furthermore, the phases of the output signals vgsa and vgsb of the controller a and the controller b are sequentially delayed by a set angle θ, and the value range of θ is 0 to 2 pi.
When example 1 is in Continuous Conduction Mode (CCM), its steady state operation process includes the following stages.
(1) When the N-type MOS tube Ma _1 is cut off, the diode Da _1 is conducted, the direct-current power supply Vi, the diode Da _1, the inductor L1 and the buck capacitor-inductor energy storage module form a loop, and the direct-current power supply Vi, the diode Da _1, the capacitor Ca _1 and the inductor La _1 form another loop. At this time, Ca _1 is charged, La _1 is discharged, and the operating state of L1 is related to the operating state of the buck-type capacitive-inductive energy storage module.
(2) When the N-type MOS tube Ma _1 is conducted, the diode Da _1 is cut off, the direct-current power supply Vi, the diode Da _2, the N-type MOS tube Ma _1 and the inductor La _1 form a loop, and the direct-current power supply Vi, the diode Da _2, the N-type MOS tube Ma _1, the capacitor Ca _1, the inductor L1 and the buck capacitor inductor energy storage module form another loop. At this time, Ca _1 is discharged, La _1 is charged, and the operating state of L1 is related to the operating state of the buck-type capacitive-inductive energy storage module.
(3) When the N-type MOS transistor Mb _1 is turned off, the diode Db _1 is turned on, the boost capacitor-inductor energy storage module, the inductor L1, the capacitor Cb _1, the diode Db _1, the capacitor Co and the load Z form a loop, and the diode Db _2, the inductor Lb _1, the diode Db _1, the capacitor Co and the load Z form another loop. At this time, Cb _1 charges and Lb _1 discharges.
(4) When the N-type MOS transistor Mb _1 is turned on, the diode Db _1 is turned off, the boost capacitor-inductor energy storage module, the inductor L1, the diode Db _3, the N-type MOS transistor Mb _1, the capacitor Co and the load Z form a loop, and the diode Db _2, the inductor Lb _1, the capacitor Cb _1, the diode Db _3, the N-type MOS transistor Mb _1, the capacitor Co and the load Z form another loop. At this time, Cb _1 is discharged and Lb _1 is charged.
Fig. 4 is a waveform diagram of a simulation operation of example 1 under a condition where θ is 0. Fig. 5 is a waveform diagram of a simulation operation of example 1 under the condition of θ ═ pi. As can be seen from fig. 4 and 5, in embodiment 1, the input current ii is continuous, the output current iob is continuous, the inter-stage current ioa is also continuous, and the output voltage Vo may be larger or smaller than the dc power voltages Vi, Vo, and Vi, which are common to ground and have the same polarity. Comparing fig. 4 and 5, it can be seen that θ has an effect on the ripple of ii, iob and ioa.
Example 2
Referring to fig. 2, 3, 6 and 7, in a cascaded buck-boost DC-DC converter, a port Vib + of a buck capacitor inductor energy storage module is connected to a positive terminal of a DC power supply Vi, a port Vob + of the buck capacitor inductor energy storage module is connected to one end of an inductor L1, the other end of the inductor L1 is connected to a port Via + of the boost capacitor inductor energy storage module, and a port Voa + of the boost capacitor inductor energy storage module is connected to one end of a capacitor Co.
Controller a adopts UC3842 and the like, and controller b adopts a combination of UC3842 and IR2110 and the like.
The rest of the structure of embodiment 2 is the same as embodiment 1.
When example 2 is in Continuous Conduction Mode (CCM), its steady state operation process includes the following stages.
(1) When the N-type MOS transistor Mb _1 is turned off, the diode Db _1 is turned on, the dc power supply Vi, the capacitor Cb _1, the diode Db _1, the inductor L1 and the boost capacitor-inductor energy storage module form one loop, and the diode Db _2, the inductor Lb _1, the diode Db _1, the inductor L1 and the boost capacitor-inductor energy storage module form another loop. At this time, Cb _1 is charged, and the operating state of L1 is related to the operating state of the boost-type capacitive energy storage module.
(2) When the N-type MOS transistor Mb _1 is turned on, the diode Db _1 is turned off, the dc power supply Vi, the diode Db _3, the N-type MOS transistor Mb _1, the inductor L1 and the boost capacitor inductor energy storage module form one loop, and the diode Db _2, the inductor Lb _1, the capacitor Cb _1, the diode Db _3, the N-type MOS transistor Mb _1, the inductor L1 and the boost capacitor inductor energy storage module form another loop. At this time, Cb _1 is discharged, and the operating state of L1 is related to the operating state of the boost-type capacitive energy storage module.
(3) When the N-type MOS transistor Ma _1 is cut off, the diode Da _1 is conducted, the voltage reduction type capacitance and inductance energy storage module, the inductor L1, the diode Da _1, the capacitor Co and the load Z form a loop, and the voltage reduction type capacitance and inductance energy storage module, the inductor L1, the diode Da _1, the capacitor Ca _1 and the inductor La _1 form another loop. At this time, Ca — 1 is charged.
(4) When the N-type MOS tube Ma _1 is conducted, the diode Da _1 is cut off, the voltage-reducing type capacitance and inductance energy storage module, the inductor L1, the diode Da _2, the N-type MOS tube Ma _1 and the inductor La _1 form a loop, and the voltage-reducing type capacitance and inductance energy storage module, the inductor L1, the diode Da _2, the N-type MOS tube Ma _1, the capacitor Ca _1, the capacitor Co and the load Z form another loop. At this time, Ca _1 is discharged.
Fig. 6 is a waveform diagram of a simulation operation of example 2 under the condition that θ is 0. Fig. 7 is a waveform diagram of a simulation operation of example 2 under the condition of θ ═ pi. As can be seen from fig. 6 and 7, in example 2, the input current ii is continuous, the output current ioa is continuous, the inter-stage current iob is also continuous, and the output voltage Vo may be larger or smaller than the dc power supply voltages Vi, Vo, and Vi, which are common to ground and have the same polarity. Comparing fig. 6 and 7, it can be seen that θ has an effect on the ripple of ii, ioa and iob.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather by the claims and their equivalents.
Claims (7)
1. A cascaded buck-boost DC-DC converter is characterized in that: the cascaded boost-buck DC-DC converter comprises an inductor L1, 1 boost-boost capacitor inductor energy storage module, 1 buck capacitor inductor energy storage module and a capacitor Co, wherein the boost-boost capacitor inductor energy storage module is provided with a port Via +, a port Voa + and a port Gnda, the buck capacitor inductor energy storage module is provided with a port Vib +, a port Vob + and a port Gndb, one end of the capacitor Co is connected with one end of a load Z, the other end of the load Z is simultaneously connected with the other end of the capacitor Co, the negative end of a direct-current power supply Vi, the port Gnda of the boost-boost capacitor inductor energy storage module and the port Gndb of the buck capacitor inductor energy storage module, and the rest parts of the boost-boost capacitor inductor energy storage module and the buck capacitor inductor energy storage module and an inductor L1 are positioned between the direct-current power supply Vi and the capacitor Co and are;
the boost type capacitance and inductance energy storage module comprises a diode Da _1, a capacitor Ca _1, an inductor La _1 and an electronic switch Sa, wherein the electronic switch Sa is provided with a port c and a port d, the anode of the diode Da _1 is simultaneously connected with the port Via + of the boost type capacitance and inductance energy storage module and the port c of the electronic switch Sa, the cathode of the diode Da _1 is simultaneously connected with one end of the capacitor Ca _1 and the port Voa + of the boost type capacitance and inductance energy storage module, the port d of the electronic switch Sa is simultaneously connected with the other end of the capacitor Ca _1 and one end of the inductor La _1, and the other end of the inductor La _1 is connected with the port Gnda of the boost type capacitance and inductance energy storage module;
the voltage-reducing type capacitance-inductance energy storage module comprises a diode Db _1, a capacitor Cb _1, a diode Db _2, an inductor Lb _1 and an electronic switch Sb, wherein the electronic switch Sb is provided with a port e and a port f, one end of the capacitor Cb _1 is simultaneously connected with the port Vib + of the voltage-reducing type capacitance-inductance energy storage module and the port e of the electronic switch Sb, the other end of the capacitor Cb _1 is simultaneously connected with the anode of the diode Db _1 and one end of the inductor Lb _1, the cathode of the diode Db _1 is simultaneously connected with the port Vob + of the voltage-reducing type capacitance-inductance energy storage module and the port f of the electronic switch Sb, the other end of the inductor Lb _1 is connected with the cathode of the diode Db _2, and the anode of the diode Db _2 is connected with the port Gndb of.
2. The cascaded buck-boost DC-DC converter of claim 1, wherein: the port Via + of the boost type capacitance inductance energy storage module is connected with the positive end of a direct current power supply Vi, the port Voa + of the boost type capacitance inductance energy storage module is connected with one end of an inductor L1, the other end of the inductor L1 is connected with the port Vib + of the buck type capacitance inductance energy storage module, and the port Vob + of the buck type capacitance inductance energy storage module is connected with one end of a capacitor Co.
3. The cascaded buck-boost DC-DC converter of claim 1, wherein: the port Vib + of the voltage reduction type capacitance inductance energy storage module is connected with the positive end of a direct current power supply Vi, the port Vob + of the voltage reduction type capacitance inductance energy storage module is connected with one end of an inductor L1, the other end of the inductor L1 is connected with the port Via + of the voltage boost type capacitance inductance energy storage module, and the port Voa + of the voltage boost type capacitance inductance energy storage module is connected with one end of a capacitor Co.
4. A cascaded buck-boost DC-DC converter as claimed in any one of claims 1 to 3, wherein: the electronic switch Sa is a one-way conductive electronic switch, that is, when the electronic switch Sa is turned on, the current flows in from the port c and flows out from the port d, and the electronic switch Sb is a one-way conductive electronic switch, that is, when the electronic switch Sb is turned on, the current flows in from the port e and flows out from the port f.
5. The cascaded buck-boost DC-DC converter of claim 4, wherein: the electronic switch Sa comprises a diode Da _2, an N-type MOS tube Ma _1 and a controller a, the controller a is provided with a port vga, the anode of the diode Da _2 is connected with the port c of the electronic switch Sa, the cathode of the diode Da _2 is connected with the drain of the N-type MOS tube Ma _1, the source of the N-type MOS tube Ma _1 is connected with the port d of the electronic switch Sa, the gate of the N-type MOS tube Ma _1 is connected with the port vga of the controller a,
the electronic switch Sb comprises a diode Db _3, an N-type MOS transistor Mb _1 and a controller b, the controller b has a port vgb, an anode of the diode Db _3 is connected with a port e of the electronic switch Sb, a cathode of the diode Db _3 is connected with a drain of the N-type MOS transistor Mb _1, a source of the N-type MOS transistor Mb _1 is connected with a port f of the electronic switch Sb, and a gate of the N-type MOS transistor Mb _1 is connected with the port vgb of the controller b.
6. The cascaded buck-boost DC-DC converter of claim 5, wherein: and the controller a and the controller b both adopt power supply control chips.
7. The cascaded buck-boost DC-DC converter of claim 5 or 6, wherein: the phases of output signals vgsa and vgsb of the controller a and the controller b are sequentially delayed by a set angle theta, and the value range of the theta is 0 to 2 pi.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109391152A (en) * | 2018-11-12 | 2019-02-26 | 浙江工业大学 | Cascade buck-boost type DC-DC converter |
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