CN201699583U - Topological structure of voltage boosting and reducing chopper circuit - Google Patents

Topological structure of voltage boosting and reducing chopper circuit Download PDF

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Publication number
CN201699583U
CN201699583U CN2009200660133U CN200920066013U CN201699583U CN 201699583 U CN201699583 U CN 201699583U CN 2009200660133 U CN2009200660133 U CN 2009200660133U CN 200920066013 U CN200920066013 U CN 200920066013U CN 201699583 U CN201699583 U CN 201699583U
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diode
capacitor
circuit
stepping
voltage
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CN2009200660133U
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林文彪
吴强
罗国永
羊利芬
齐放
李碧钰
周维
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Zhuzhou CRRC Times Electric Co Ltd
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Zhuzhou CSR Times Electric Co Ltd
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Abstract

The utility model discloses a topological structure of a voltage boosting and reducing chopper circuit. A first switch tube V1 of the topological structure is connected in parallel on a power supply Us after being connected in series with an inductor L and a second switch tube V2, a first diode D1 is connected in parallel at both ends of the inductor L after being connected in series with a second capacitor C2 and a second diode D2, a first capacitor C1 is connected in parallel on a branch circuit formed by the first switch tube V1, the inductor L and the second diode D2, a third capacitor C3 is connected in parallel on a branch circuit formed by the second diode V2, the inductor L and the first diode D1, and a load RL is connected in parallel on the second capacitor C2. The voltage stress born by the switch tubes V1 and V2 in the utility model is small and is only (Us+Uo)/2, the average voltage born by the capacitors C1 and C3 is (Us-Uo)/2, and the requirement of the voltage stress of the capacitors is reduced, so the utility model can adapt to occasions with higher voltage, can prolong the service life, and can reduce the cost.

Description

A kind of topology structure of stepping-up/stepping-down chopper circuit
Technical field
The utility model belongs to stepping-up/stepping-down chopper circuit, is specifically related to a kind of topology structure of stepping-up/stepping-down chopper circuit.
Background technology
As its name suggests, the existing boost function of stepping-up/stepping-down chopper circuit also has buck functionality, in time adjusts the state of switching tube according to the variation of input voltage, keeps the stable of output.Buck-Boost circuit, Cuk circuit, Sepic circuit, Zeta circuit are four kinds of modal topology structure of stepping-up/stepping-down chopper circuit.Switching tube all will bear higher voltage stress relatively in circuit topological structure, and wherein switching tube bears 2U in the Buck-Boost circuit S(U SBe input voltage, down with) voltage stress, switching tube bears U in other three kinds of stepping-up/stepping-down chopper circuit topologys S+ U O(U OBe output voltage, down together) voltage stress; Therefore these circuit topologies just have been subjected to certain restriction in the use of high pressure occasion, perhaps will adopt the more switching tube of voltage levels, and this will inevitably cause the increase of product cost.
In the prior art, exist the relation (wherein α is a switching tube conducting duty ratio, 0≤α≤1) of Uo=Us * α between the input and output voltage of Buck circuit, thereby the Buck circuit only has buck functionality, do not have boost function; And exist the relation of Uo=Us/ (1-α) between the input and output voltage of Boost circuit, can only realize that boost function can not realize buck functionality.For the function that realizes buck copped wave just must get up Buck circuit and Boost circuit synthesis could realize function corresponding, and comprehensively be not only the combination of circuit structure, also comprise evolution combinational circuit; Four kinds of basic stepping-up/stepping-down chopper circuits such as above-mentioned Buck-Boost develop on Buck circuit and basis that the Boost circuit combines and come.Mentioned another topology structure of stepping-up/stepping-down chopper circuit in some document, physical circuit as shown in Figure 1.In this main circuit, capacitor C 1, C2, C3 are connected in series, the end of C1 and power supply U SPositive pole link to each other the other end and output voltage U 0Negative pole link to each other; And the end of C3 and power supply U SNegative pole link to each other the other end and output voltage U 0Positive pole link to each other.Capacitor C 1 in this circuit, the average voltage that C3 bore are half of input and output voltage sum, are (Us+Uo)/2.The required voltage stress that bears of electric capacity is higher, or improves the rated operational voltage of electric capacity, or the connection in series-parallel by electric capacity reduces the requirement to voltage stress.Same electric capacity bears high voltage stress, and to the useful life of electric capacity, the reliability of system is all brought adverse effect, and is especially obvious in the high-power occasion.
The utility model content
The purpose of this utility model is to provide a kind of topology structure of stepping-up/stepping-down chopper circuit for the problem that solves the prior art existence, it can reduce the voltage stress that switching tube is born in the course of the work, circuit can work in higher voltage occasion, increase the service life, reduce cost, reduce volume, improve system reliability.
The purpose of this utility model is achieved through the following technical solutions:
The utility model topology structure of stepping-up/stepping-down chopper circuit, comprise power supply Us, the first switching tube V1, second switch pipe V2, inductance L, the first diode D1, the second diode D2, first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3 and load RL: wherein the first switching tube V1 be connected in parallel on the power supply Us after inductance L and second switch pipe V2 are connected, the first diode D1 be connected in parallel on the inductance L two ends after second capacitor C 2 and the second diode D2 are connected, first capacitor C 1 is connected in parallel on the branch road of the first switching tube V1 and inductance L and second diode D2 composition, the 3rd capacitor C 3 is connected in parallel on the branch road of second switch pipe V2 and inductance L and first diode D1 composition, and load RL is connected in parallel on second capacitor C 2.
The topology structure of stepping-up/stepping-down chopper circuit that the utility model provides is equivalent to two-phase DC/DC DC converter in essence, and the duty ratio size of two switching tube driving pulses is the same, just the phase difference of half cycle on phase place.When the conducting duty ratio of switching tube was not more than 0.5, there was not the situation of conducting simultaneously in two switching tubes, and circuit working is in decompression mode, U S, V1, L, D2, C2, C3 form a Buck circuit, U S, V2, L, D1, C2, C1 form another Buck circuit.When the driving pulse conducting duty ratio of switching tube greater than 0.5 the time, U S, V1, L, V2 form a Boost circuit, when V1, V2 in turn as the main switch of Boost circuit.The voltage (Us+Uo)/2 that this contactor pipe is born only is about half in four kinds of topological structures of prior art.Owing to adopt two switching tubes, and two switches are alternate conduction and shutoff, have improved the switching frequency of system, have reduced the volume and the capacity of energy storage inductor, have reduced the pulsation of output voltage.Simultaneously the electric capacity connected mode on the main circuit is improved, reduced requirement to capacitance voltage stress, the voltage that capacitor C 1, C3 bore only is (Us-Uo)/2, so it is having more advantage with respect to topology structure of stepping-up/stepping-down chopper circuit shown in Figure 1 aspect required voltage stress that bears of electric capacity.Reduced the requirement to capacitance voltage stress, than higher occasion, the voltage stress that is born on the electric capacity differs greatly at input and output voltage, bears low voltage stress, can improve the useful life of electric capacity, improves the reliability of system.Advantage at high-power occasion this respect is just more obvious.
Further specify the technical solution of the utility model below in conjunction with accompanying drawing,
Description of drawings
Fig. 1 is existing topology structure of stepping-up/stepping-down chopper circuit schematic diagram.
Fig. 2 is a topology structure of stepping-up/stepping-down chopper circuit schematic diagram of the present utility model.
Fig. 3 is the flow chart of topology structure of stepping-up/stepping-down chopper circuit of the present utility model when working in decompression mode.
Fig. 4 is the flow chart of topology structure of stepping-up/stepping-down chopper circuit of the present utility model when working in boost mode.
Fig. 5 is the circuit diagram of one of topology structure of stepping-up/stepping-down chopper circuit application of the present utility model.
Fig. 6 is two a circuit diagram of topology structure of stepping-up/stepping-down chopper circuit application of the present utility model.
Embodiment
Fig. 2 has provided the circuit topological structure schematic diagram of an embodiment of the present utility model.Comprise power supply Us, switching tube V1, switching tube V2, inductance L, diode D1, diode D2, capacitor C 1, capacitor C 2, capacitor C 3 and load RL in the circuit topological structure; Concrete annexation is: the c utmost point of switching tube V1 is connected to the positive pole of power supply Us, and the e utmost point of switching tube V1 is connected to an end of inductance L; The other end of inductance L is connected to the c utmost point of switching tube V2, and the e utmost point of switching tube V2 is connected to the negative pole of power supply Us; The negative electrode of diode D1 is connected to the e utmost point of switching tube V1, anode is connected to an end of capacitor C 2 (when C2 uses electrochemical capacitor, the anode of diode D1 should be connected to the negative pole of capacitor C 2), the other end of capacitor C 2 (is exactly the positive pole of capacitor C 2 for electrochemical capacitor) is connected to the negative electrode of diode D2, and the anode of diode D2 is connected to the c utmost point of switching tube V2; One end of capacitor C 1 is connected to the c utmost point of switching tube V1, and the other end is connected to the negative electrode of diode D2; One end of capacitor C 3 is connected to the e utmost point of switching tube V2, and the other end is connected to the anode of diode D1; The load positive input terminal is connected to the negative electrode of diode D2, and negative input end is connected to the anode of diode D1.
Switching tube is that pin title according to IGBT describes on the above-mentioned annexation, if the switching tube of other types, then pin need be changed accordingly.
Switching tube can be a kind of in the intelligent gate-controlled switch devices such as IGBT, IPM, MOSFET, and diode can be independent diode (led) module, also can be the inner integrated diode components of switching device such as IGBT.
Operation principle:
Actually in this circuit topological structure comprising two DC/DC translation circuits.The duty ratio size of the drive signal of two switching tubes is the same, the phase difference of half cycle on the phase place, change switching tube drive signal conducting duty ratio, and just can change output voltage, there is following relation between the input and output voltage:
U o = α 1 - α U S
Wherein α is a switching tube conducting duty ratio.When α≤0.5, circuit working is in the buck chopper pattern, and when α＞0.5, circuit working is at boost mode.For the ease of understanding, circuit topology also is divided into decompression mode and boost mode is set forth.
When α≤0.5, circuit working is in decompression mode, and the concrete course of work is:
Figure G2009200660133D00052
V2 ends the V1 conducting: power supply Us charges to capacitor C 3 by V1, L, D2, C2; C1 discharges by V1, L, D2 loop; C2 provides energy by C2, RL loop for RL, normally exports to keep RL.
V1 is transferred to by (V2 remain off) by conducting: because the electric current on the L can not suddenly change, L will charge energy delivery by D1, L, D2, RL loop to load RL and to capacitor C 2; L also passes through Us, C3, D1, L, D2, C1 loop to C1, C3 reverse charging simultaneously.
Figure G2009200660133D00054
V2 transfers conducting (V1 remain off) to by ending: Us charges to capacitor C 1 by V2, L, D1, C2; C3 discharges by D1, L, V2 loop; C2 provides energy by C2, RL loop for RL, normally exports to keep RL.
Figure G2009200660133D00055
V2 is transferred to by (V1 remain off) by conducting: because the electric current on the L can not suddenly change, L will charge energy delivery by D1, L, D2, RL loop to load RL and to capacitor C 2; L also passes through C1, Us, C3, D1, L, D2 loop to C1, C3 reverse charging simultaneously.
Figure G2009200660133D00056
V1 has got back to the first step of the course of work in fact again by by transferring conducting (V2 remain off) to.When α＞0.5, circuit working is in boost mode, and the concrete course of work is:
Figure G2009200660133D00057
V1, V2 conducting simultaneously, power supply Us directly is added on the L, the L storage power; Us charges to C1, C3 by Us, C1, RL, C3 loop; C2 provides energy by C2, RL loop for RL, normally exports to keep RL.
Figure G2009200660133D00061
V1 is transferred to by (V2 keeps conducting) by conducting, and because of the L electric current can not suddenly change, L will charge to C2; Us charges to C1 by Us, C1, C2, D1, L, V2 loop; C3 is by D1, L, V2, the discharge of C3 loop.
Figure G2009200660133D00062
V1 transfers conducting (V2 keeps conducting), L storage power to by ending; Us charges to C1, C3 by Us, C1, RL, C3 loop; C2 provides energy by C2, RL loop for RL, normally exports to keep RL.
Figure G2009200660133D00063
V2 is transferred to by (V1 keeps conducting) by conducting, and because of the L electric current can not suddenly change, L will charge to C2; Us charges to C3 by Us, V1, L, D2, C2, C3 loop; C1 is by V1, L, D2, the discharge of C1 loop.
Figure G2009200660133D00064
V2 turns back to V1, V2 conducting state simultaneously by by transferring conducting (V1 keeps conducting) to.
When stable state, the voltage sum on C1, C2, the C3 electric capacity equals input voltage Us, and capacitor C 1, the average voltage that C3 bore are (Us-Uo)/2.When input voltage was higher than desired output voltage, circuit working was in the buck chopper pattern, and V1, V2 driving pulse conducting duty ratio are less than 0.5; When input voltage was lower than desired output voltage, circuit working was in boost mode, and V1, V2 driving pulse conducting duty ratio have the situation of two switching tubes conducting simultaneously greater than 0.5.When input voltage changes, adjust V1, V2 driving pulse duty ratio according to input voltage, reach the result who keeps stable output.
After circuit reaches stable state, have according to Kirchhoff's second law:
Us＝U C1+U C2+U C3
And U C1=U C3, U C2=U o, and then obtain:
U C1＝U C3＝(Us-U O)/2
When the V1 conducting, when V2 ends, the voltage that V2 bore is:
U V2＝Us-U C1＝Us-(Us-U O)/2＝(Us+U O)/2
In like manner, when the V2 conducting, when V1 ends, the voltage that V1 bore is:
U V1=Us-U C3=Us-(Us-U O)/2=(Us+U O)/2 have according to Kirchhoff's second law after circuit reaches stable state:
Us＝U C1+U C2+U C3
And U C1=U C3, U C2=U o, and then obtain:
U C1＝U C3＝(Us-U O)/2
When the V1 conducting, when V2 ends, the voltage that V2 bore is:
U V2＝Us-U C1＝Us-(Us-U O)/2＝(Us+U O)/2
In like manner, when the V2 conducting, when V1 ends, the voltage that V1 bore is:
U V1＝Us-U C3＝Us-(Us-U O)/2＝(Us+U O)/2
Application example 1
One of application of the present utility model; as shown in Figure 5; on the basis of topology structure of stepping-up/stepping-down chopper circuit; input filter circuit (L1 and C4 form LC filtering), soft starting circuit (counnter attack diode V3, charging resistor R1, short circuit contactor KM1 form), switching tube protective circuit and input and output voltage parameter detecting circuit (current sensor SC1, SC2, voltage sensor SV1, SV2) have been increased.The filter circuit that operation principle: L1 and C4 form carries out filtering to the input power supply, the input power supply charges to electric capacity through counnter attack diode V3, charging resistor R1, after charging is finished, KM1 closes and with counnter attack diode V3, charging resistor branch road short circuit, novel elevating presses chopper circuit to start working then.
Application example 2
Two of application of the present utility model, as shown in Figure 6, it is on the basis of circuit shown in Figure 5, with " two-tube IGBT " replacement " switching tube and connected diode ", a switching tube among the two-tube IGBT is as main switch, and another one is used as diode.

Claims (1)

1. topology structure of stepping-up/stepping-down chopper circuit, comprise power supply Us, the first switching tube V1, second switch pipe V2, inductance L, the first diode D1, the second diode D2, first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3 and load RL: wherein the first switching tube V1 be connected in parallel on the power supply Us after inductance L and second switch pipe V2 are connected, the first diode D1 be connected in parallel on the inductance L two ends after second capacitor C 2 and the second diode D2 are connected, first capacitor C 1 is connected in parallel on the branch road of the first switching tube V1 and inductance L and second diode D2 composition, the 3rd capacitor C 3 is connected in parallel on the branch road of second switch pipe V2 and inductance L and first diode D1 composition, and load RL is connected in parallel on second capacitor C 2.
CN2009200660133U 2009-09-25 2009-09-25 Topological structure of voltage boosting and reducing chopper circuit Expired - Lifetime CN201699583U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101674014B (en) * 2009-09-25 2012-07-04 株洲南车时代电气股份有限公司 Topology structure of stepping-up/stepping-down chopper circuit
CN111585433A (en) * 2020-05-07 2020-08-25 国网重庆市电力公司电力科学研究院 Universal interface, control method and energy storage system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101674014B (en) * 2009-09-25 2012-07-04 株洲南车时代电气股份有限公司 Topology structure of stepping-up/stepping-down chopper circuit
CN111585433A (en) * 2020-05-07 2020-08-25 国网重庆市电力公司电力科学研究院 Universal interface, control method and energy storage system
CN111585433B (en) * 2020-05-07 2022-02-11 国网重庆市电力公司电力科学研究院 Universal interface, control method and energy storage system

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Granted publication date: 20110105

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