CN211352049U - High-transformation-ratio DC/DC conversion circuit - Google Patents
High-transformation-ratio DC/DC conversion circuit Download PDFInfo
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- CN211352049U CN211352049U CN202020340020.4U CN202020340020U CN211352049U CN 211352049 U CN211352049 U CN 211352049U CN 202020340020 U CN202020340020 U CN 202020340020U CN 211352049 U CN211352049 U CN 211352049U
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Abstract
The utility model relates to a high transformation ratio DC/DC converting circuit, this circuit includes input interface, first full-control switch device Q1, second full-control switch device Q2, third full-control switch device S1, first electric capacity C1, second electric capacity C2, third electric capacity C3, fourth electric capacity C4, first inductance L1, second inductance L2, third inductance L3, first diode D1, second diode D2, third diode D3 and output interface, through the operating condition of controlling first full-control switch device Q1, second full-control switch device Q2 and third full-control switch device S1, realize different converting circuit operating mode and correspond the function. The utility model discloses converting circuit can be according to the difference of input and output and select different mode, decides different operating condition to can realize the high transformation ratio work, be particularly suitable for using in the wide voltage transformation occasion of direct current such as photovoltaic new forms of energy.
Description
Technical Field
The utility model relates to a vary voltage technical field, concretely relates to high transformation ratio DC/DC converting circuit.
Background
A direct current-direct current (DC/DC) conversion circuit is widely used in various power conversion systems, is one of important conversions for power conversion management, and has a main function of converting voltage. Because the direct current is different from the alternating current, the alternating current can conveniently realize the conversion regulation among various voltage grades through a transformer, the direct current cannot realize the regulation of the voltage by using a transformer transformation principle similar to that of the transformer, and the direct current needs to be realized by adopting various DC/DC conversion circuits, and the voltage conversion of the direct current can be mainly divided into boosting, reducing and boosting according to different application scenes. The conventional conversion circuit has the defects and shortcomings of limited engineering application transformation ratio, single functional mode and the like, and particularly, for the occasions with large direct-current voltage fluctuation range such as solar photovoltaic power generation and the like, the high-transformation-ratio application is realized by adopting modes such as multi-circuit combination and the like. The utility model discloses a design high variable ratio high performance's circuit solves the engineering application demand of similar these high variable ratio occasions.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the problem that prior art exists, provide a high transformation ratio DC/DC converting circuit, adjust the circuit as required according to the application mode of difference and can realize high transformation ratio and multi-mode work, satisfy the demand of engineering application occasions such as solar photovoltaic power generation.
For realizing above-mentioned technical purpose, reach above-mentioned technological effect, the utility model discloses a following technical scheme realizes:
a high transformation ratio DC/DC conversion circuit comprises an input interface, a first full-control switch device Q1, a second full-control switch device Q2, a third full-control switch device S1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first inductor L1, a second inductor L2, a third inductor L3, a first diode D1, a second diode D2, a third diode D3 and an output interface, wherein different conversion circuit working modes and corresponding functions are realized by controlling the working states of the first full-control switch device Q1, the second full-control switch device Q2 and the third full-control switch device S1; wherein the content of the first and second substances,
a common end of the third fully-controlled switch device S1 is connected to a common connection point of a positive end of the input interface, the first fully-controlled switch device Q1 and the first capacitor C1, and a control end of the third fully-controlled switch device S1 is connected to a common connection point of a first inductor L1, a third inductor L3, a third capacitor C3 and the second fully-controlled switch device Q2;
the control end of the first full-control switching device Q1 is connected with the cathode end of a first diode D1 and the anode end of a second diode D2;
the control end of the second fully-controlled switching device Q2 is connected with a common connection point of a second inductor L2, a second capacitor C2, the negative pole end of the output interface and a fourth capacitor C4;
the positive end of the first diode D1 is connected with the other common connection point of the negative end of the output interface, the first capacitor C1, the third capacitor C3 and the second inductor L2;
the negative electrode end of the second diode D2 is connected with the other common connection point of the first inductor L1 and the second capacitor C2;
the first capacitor C1 is connected in parallel with the input interface, the fourth capacitor C4 is connected in parallel with the output interface, the third inductor L3 is connected with the positive end of the output interface through a third diode D3, and a second inductor L2 is connected between the input interface and the negative end of the output interface.
Furthermore, the positive terminal of the input interface is sequentially electrically connected with a third full-control switch device S1, a third inductor L3, a third diode D3 and the positive terminal of the output interface to form a direct-current conversion efficient direct-current circuit, so that the electric energy of the input interface is equivalently and directly connected to the output interface.
Further, the first fully-controlled switching device Q1, the first diode D1, the second diode D2, the third diode D3, the first inductor L1, the second inductor L2, and the third inductor L3 form a Buck conversion circuit, so as to implement Buck conversion from input interface electric energy to output interface electric energy.
Further, the second diode D2, the first inductor L1, the second inductor L2, the first capacitor C1 and the second capacitor C2 form a Z-source conversion circuit.
Further, the second diode D2, the first capacitor C1, the second capacitor C2, the second fully-controlled switching device Q2, the first inductor L1, the second inductor L2, the third inductor L3, and the third diode D3 constitute a high-transformation-ratio Boost Z-Boost conversion circuit, so as to realize high-transformation-ratio Boost conversion from input interface electric energy to output interface electric energy.
Furthermore, the open states of the first fully-controlled switching device Q1, the second fully-controlled switching device Q2 and the third fully-controlled switching device S1 form a protection circuit, so that circuit isolation between input and output is realized.
The utility model has the advantages that:
the utility model discloses converting circuit can be according to the difference of input and output and select different mode, decides different operating condition to can realize the high transformation ratio work, be particularly suitable for using in the wide voltage transformation occasion of direct current such as photovoltaic new forms of energy.
Drawings
Fig. 1 is a schematic diagram of a conversion circuit of the present invention;
fig. 2a is a connection diagram of a direct mode circuit of the conversion circuit of the present invention;
fig. 2b is a circuit connection diagram of the voltage-reducing mode of the conversion circuit of the present invention;
fig. 2c is a circuit diagram of the boost mode of the conversion circuit of the present invention;
fig. 2d is a circuit diagram of the protection mode of the conversion circuit of the present invention;
fig. 3 is a diagram of the working process of the conversion circuit of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1, a high transformation ratio DC/DC conversion circuit includes an input interface, a first fully-controlled switching device Q1, a second fully-controlled switching device Q2, a third fully-controlled switching device S1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first inductor L1, a second inductor L2, a third inductor L3, a first diode D1, a second diode D2, a third diode D3, and an output interface, and realizes different conversion circuit operation modes and corresponding functions by controlling the operation states of the first fully-controlled switching device Q1, the second fully-controlled switching device Q2, and the third fully-controlled switching device S1; wherein the content of the first and second substances,
a common end of the third fully-controlled switch device S1 is connected to a common connection point of a positive end of the input interface, the first fully-controlled switch device Q1 and the first capacitor C1, and a control end of the third fully-controlled switch device S1 is connected to a common connection point of a first inductor L1, a third inductor L3, a third capacitor C3 and the second fully-controlled switch device Q2;
the control end of the first full-control switching device Q1 is connected with the cathode end of a first diode D1 and the anode end of a second diode D2;
the control end of the second fully-controlled switching device Q2 is connected with a common connection point of a second inductor L2, a second capacitor C2, the negative pole end of the output interface and a fourth capacitor C4;
the positive end of the first diode D1 is connected with the other common connection point of the negative end of the output interface, the first capacitor C1, the third capacitor C3 and the second inductor L2;
the negative electrode end of the second diode D2 is connected with the other common connection point of the first inductor L1 and the second capacitor C2;
the first capacitor C1 is connected in parallel with the input interface, the fourth capacitor C4 is connected in parallel with the output interface, the third inductor L3 is connected with the positive end of the output interface through a third diode D3, and a second inductor L2 is connected between the input interface and the negative end of the output interface.
As shown in fig. 2a, in the pass-through mode: and the positive end of the input interface is sequentially electrically communicated with a third full-control switch device S1, a third inductor L3, a third diode D3 and the positive end of the output interface to form a direct-current conversion efficient direct-current circuit so as to realize the equivalent direct connection of the electric energy of the input interface to the output interface.
As shown in fig. 2b, in the buck mode: the first fully-controlled switch device Q1, the first diode D1, the second diode D2, the third diode D3, the first inductor L1, the second inductor L2 and the third inductor L3 form a Buck Buck conversion circuit so as to realize Buck conversion from input interface electric energy to output interface electric energy.
The second diode D2, the first inductor L1, the second inductor L2, the first capacitor C1 and the second capacitor C2 form a Z-source conversion circuit.
As shown in fig. 2c, in boost mode: the second diode D2, the first capacitor C1, the second capacitor C2, the second fully-controlled switching device Q2, the first inductor L1, the second inductor L2, the third inductor L3 and the third diode D3 form a high-transformation-ratio Boost Z-Boost conversion circuit so as to realize high-transformation-ratio Boost conversion from input interface electric energy to output interface electric energy.
As shown in fig. 2d, for protection mode: and the disconnection states of the first fully-controlled switching device Q1, the second fully-controlled switching device Q2 and the third fully-controlled switching device S1 form a protection circuit, so that the circuit isolation of input and output is realized.
As shown in fig. 3, when in use, the utility model can adopt the following working processes:
step 1) detecting an input voltage value Uin and an output voltage set value Uout _ set;
step 2) comparing the input voltage value Uin with the output set voltage value Uout _ set, and calculating the absolute value Ue of the difference;
step 3) determining the working mode of the circuit according to the comparison result of the step 2), and determining the working mode of the circuit after comparing the value of Ue with the set voltage difference Ue _ set1 or Ue _ set2, specifically: if the input voltage Uin is greater than the output voltage Uout _ set and Ue is less than the set voltage difference Ue _ set1, the circuit works in a through mode; otherwise, the circuit works in a Buck Buck circuit mode; if the input voltage Uin is smaller than the output voltage Uout _ set, the circuit works in a boosting Z-Boost mode with high transformation ratio; this can be visualized by the following equation:
；
step 4) according to different circuit working states in the step 3), implementing different controls on the first fully-controlled switching device Q1, the second fully-controlled switching device Q2 and the third fully-controlled switching device S1, specifically: in a through working state, the first full-control switching device Q1 and the second full-control switching device Q2 are in an off state, and the third full-control switching device S1 is in an on state; under the Buck circuit working state, the first full-control switching device Q1 works in a PWM signal control state, and the second full-control switching device Q2 and the third full-control switching device S1 are in an off state; if the all-control switching device works in the Z-Boost working state, the first all-control switching device Q1 is in a switching-on state, the second all-control switching device Q2 works in a PWM signal control state, and the third all-control switching device S1 is in a switching-off state;
step 5) according to the work control mode of the first full-control switching device Q1, the second full-control switching device Q2 and the third full-control switching device S1 determined in the step 4), implementing a conversion function of a control completion circuit, wherein under the Buck circuit working state and the Z-Boost working state, the duty ratio of a PWM control signal is adjusted in real time according to the difference value Ue;
and 6) if the fault is detected, the conversion circuit enters an isolation protection state by completely disconnecting the first full-control switch device Q1, the second full-control switch device Q2 and the third full-control switch device S1.
In addition, it should be noted that the terms "first", "second", "third", and the like in the specification are used for distinguishing various components, elements, steps, and the like in the specification, and are not used for indicating a logical relationship or a sequential relationship between the various components, elements, steps, and the like, unless otherwise specified or indicated.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A high transformation ratio DC/DC conversion circuit is characterized by comprising an input interface, a first full-control switch device Q1, a second full-control switch device Q2, a third full-control switch device S1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first inductor L1, a second inductor L2, a third inductor L3, a first diode D1, a second diode D2, a third diode D3 and an output interface, wherein different conversion circuit working modes and corresponding functions are realized by controlling the working states of the first full-control switch device Q1, the second full-control switch device Q2 and the third full-control switch device S1; wherein the content of the first and second substances,
a common end of the third fully-controlled switch device S1 is connected to a common connection point of a positive end of the input interface, the first fully-controlled switch device Q1 and the first capacitor C1, and a control end of the third fully-controlled switch device S1 is connected to a common connection point of a first inductor L1, a third inductor L3, a third capacitor C3 and the second fully-controlled switch device Q2;
the control end of the first full-control switching device Q1 is connected with the cathode end of a first diode D1 and the anode end of a second diode D2;
the control end of the second fully-controlled switching device Q2 is connected with a common connection point of a second inductor L2, a second capacitor C2, the negative pole end of the output interface and a fourth capacitor C4;
the positive end of the first diode D1 is connected with the other common connection point of the negative end of the output interface, the first capacitor C1, the third capacitor C3 and the second inductor L2;
the negative electrode end of the second diode D2 is connected with the other common connection point of the first inductor L1 and the second capacitor C2;
the first capacitor C1 is connected in parallel with the input interface, the fourth capacitor C4 is connected in parallel with the output interface, the third inductor L3 is connected with the positive end of the output interface through a third diode D3, and a second inductor L2 is connected between the input interface and the negative end of the output interface.
2. The high-conversion-ratio DC/DC conversion circuit according to claim 1, wherein the positive terminal of the input interface is electrically connected with a third fully-controlled switching device S1, a third inductor L3, a third diode D3 and the positive terminal of the output interface in sequence to form a DC conversion high-efficiency direct circuit, so that the electric energy of the input interface is equivalently and directly connected to the output interface.
3. The high-conversion-ratio DC/DC conversion circuit according to claim 1, wherein the first fully-controlled switching device Q1, the first diode D1, the second diode D2, the third diode D3, the first inductor L1, the second inductor L2 and the third inductor L3 constitute a Buck Buck conversion circuit to realize Buck conversion of the input interface power to the output interface power.
4. The high-conversion-ratio DC/DC conversion circuit according to claim 1, wherein the second diode D2, the first inductor L1, the second inductor L2, the first capacitor C1 and the second capacitor C2 form a Z-source conversion circuit.
5. The high-transformation-ratio DC/DC conversion circuit according to claim 1, wherein the second diode D2, the first capacitor C1, the second capacitor C2, the second fully-controlled switching device Q2, the first inductor L1, the second inductor L2, the third inductor L3 and the third diode D3 form a high-transformation-ratio Boost Z-Boost conversion circuit so as to realize high-transformation-ratio Boost conversion from input interface electric energy to output interface electric energy.
6. The high-conversion-ratio DC/DC conversion circuit according to claim 1, wherein the open states of the first fully-controlled switching device Q1, the second fully-controlled switching device Q2 and the third fully-controlled switching device S1 form a protection circuit, which realizes circuit isolation of the input and the output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020340020.4U CN211352049U (en) | 2020-03-18 | 2020-03-18 | High-transformation-ratio DC/DC conversion circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020340020.4U CN211352049U (en) | 2020-03-18 | 2020-03-18 | High-transformation-ratio DC/DC conversion circuit |
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| CN211352049U true CN211352049U (en) | 2020-08-25 |
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