CN112701923B - High-gain Zeta DC-DC converter - Google Patents
High-gain Zeta DC-DC converter Download PDFInfo
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- CN112701923B CN112701923B CN202011567911.4A CN202011567911A CN112701923B CN 112701923 B CN112701923 B CN 112701923B CN 202011567911 A CN202011567911 A CN 202011567911A CN 112701923 B CN112701923 B CN 112701923B
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Abstract
A high-gain Zeta DC-DC converter comprises a direct current input source, a basic Zeta converter and n-1 gain expansion units. The gain expansion unit consists of an inductor, two capacitors and a diode, and the input and output gains of the converter and the voltage stress of the switching device can be adjusted by adjusting the number of the gain expansion units. The converter has the advantages of simple control and drive circuit, wide input and output voltage regulation range, low voltage stress of a switching device and the like, and is suitable for application occasions with larger input voltage and output voltage variation range.
Description
Technical Field
The invention relates to a DC-DC converter, in particular to a high-gain Zeta DC-DC converter.
Background
In the application occasions with large input and output voltage changes, the input voltage can be higher than the output voltage or lower than the output voltage, and the common non-isolated buck-boost DC-DC converter suitable for the time has Flyback, isolated Cuk, isolated Sepic and Zeta circuits. Theoretically, by adjusting the duty ratio D, the input-output gain of these converters can be varied from zero to infinity, but the boost capability of these converters is greatly limited due to the influence of the parasitic parameters of the components and circuits. At present, the scheme for improving the input and output gains of the DC-DC converter is mainly constructed by an isolated Boost circuit cascaded with a direct current transformer, so that the circuits have more switching elements and higher loss. Therefore, the research can realize high-gain boosting and reduce power loss, and the realization of the novel wide-input-output boosting and reducing DC/DC converter has important significance.
Disclosure of Invention
In order to solve the problems of more switching elements and higher loss of the existing isolated high-gain DC-DC converter, the invention provides a novel high-gain Zeta DC-DC converter based on a basic Zeta circuit. The converter consists of a basic Zeta converter and several gain expansion units. The input and output gains of the converter and the voltage stress of the switching device can be adjusted by adjusting the number of the gain expansion units. The converter has the advantages of simple control and drive circuit, wide input and output voltage regulation range, low voltage stress of a switching device and the like; the method is suitable for the application occasions with larger variation range of input voltage and output voltage.
The technical scheme adopted by the invention is as follows:
a high-gain Zeta DC-DC converter comprises a direct current input source, 1 basic Zeta converter, 1 leakage inductance absorption unit and n-1 gain expansion units; wherein:
the basic Zeta converter comprises a primary side n and a secondary side n1:n2Three inductors L, Lr、L1Two capacitors C11、C12A power switch S1A diode D1(ii) a The connection form is as follows: power switch S1Is connected to the positive pole of the DC input source, power switch S1The source electrode of the inductor L is respectively connected with one end of the inductor L and the inductor LrOne terminal of (1), inductance LrThe other end of the inductor L is respectively connected with the lower end of the primary side of the transformer and the negative electrode of the direct current input source, and the capacitor C11One end of the capacitor C is connected with the upper end of the secondary side of the transformer11The other end is respectively connected with the inductor L1One terminal of (1), diode D1Is connected to the cathode of the inductor L1Another terminal of (1) and a capacitor C12Is connected to one terminal of a diode D1Respectively with a capacitor C12The other end of the transformer is connected with the lower end of the secondary side of the transformer;
the 1 st gain expansion unit comprises an inductor L2Diode D2And two capacitors C21、C22(ii) a Wherein, the capacitor C21The other end of the first and second inductors are respectively connected with the inductor L2One terminal of (1), diode D2Is connected to the cathode of the inductor L2Another terminal of (1) and a capacitor C22One end of the two ends are connected;
the 2 nd gain expansion unit comprises an inductor L3Diode D3And two capacitors C31、C32(ii) a Wherein, the capacitor C31The other end of the first and second inductors are respectively connected with the inductor L3One terminal of (1), diode D3Is connected to the cathode of the inductor L3Another terminal of (1) and a capacitor C32One end of the two ends are connected;
.... analogize in turn, in the ith gain expansion unit, 1 < i ≦ n-1,
the ith gain expansion unit comprises an inductor L(i+1)Diode D(i+1)And two capacitors C(i+1)1、C(i+1)2(ii) a Wherein, the capacitor C(i+1)1The other end of the first and second inductors are respectively connected with the inductor L(i+1)One terminal of (1), diode D(i+1)Is connected to the cathode of the inductor L(i+1)Another terminal of (1) and a capacitor C(i+1)2One end of the two ends are connected; diode D(i+1)Anode of (2) is connected with a capacitor C(i+1)2The other end of (a);
the leakage inductance absorption unit comprises an inductor L0Diode D0Two capacitors C01、C02(ii) a Wherein, the capacitor C01The other end of the first and second inductors are respectively connected with the inductor L0One terminal of (1), diode D0Is connected to the cathode of the inductor L0Another terminal of (1) and a capacitor C02One end of the two ends are connected;
the connection form between the gain expansion units is as follows:
i is more than 1 and less than or equal to n-1, and the capacitance C in the i-1 th gain expansion uniti2One end of (1), an inductance LiAnd the intersection of the other end of (b) and the capacitance C in the ith gain expansion unit(i+1)2Is connected to the other end of the first gain expansion unit, and a capacitor C in the (i-1) th gain expansion uniti1And the capacitor C in the ith gain expansion unit(i+1)1Are connected at one end.
The connection relationship between the 1 st gain expansion unit and the basic Zeta converter is as follows:
capacitance C in basic Zeta converter11The intersection point of one end of the capacitor C and the upper end of the secondary side of the transformer and the capacitor C in the 1 st gain expansion unit21Is connected to one end of the inductor L in the basic Zeta converter1Another terminal of (1) and a capacitor C12And the intersection point of one end of the first gain expansion unit and the diode D in the 1 st gain expansion unit2Anode and capacitor C22The intersection points of the other ends are connected.
The connection relationship between the leakage inductance absorption unit and the basic Zeta converter is as follows:
inductance L in basic Zeta converterrOne terminal of (A) and a capacitor C in the leakage inductance absorption unit01Is connected with the diode D in the leakage inductance absorption unit0Anode and capacitor ofC02The other end of the diode is connected with the other end of the diode D in the basic Zeta converter1Anode and capacitor C12And the other end of the second capacitor is connected with the inductance L in the leakage inductance absorption unit0Another terminal of (1) and a capacitor C02The intersections of one end are connected.
Load RPLAre respectively connected with the capacitor C in the (n-1) th gain expansion unitn2And C in the leakage inductance absorbing unit02And the other end of the two are connected.
The power switch S1The gate of (a) is connected to its controller, and its duty cycle can be varied between 0 and 1.
The invention discloses a novel high-gain Zeta DC-DC converter, which has the following technical effects:
1. the buck-boost circuit can realize voltage boost and buck simultaneously, and has high input and output gains, low voltage stress of a switching device and series connection of output capacitors.
When the current of the inductor L is continuously conducted, the following is concrete:
the input and output gains are:
the voltage stress of the switching tube is as follows:
the voltage on each output capacitor in the gain expansion unit is:
the voltage on the output capacitor in the leakage inductance absorption unit is:
wherein: d is the duty cycle, uinIs an input voltage uoTo output a voltage usThe voltage stress of the power switch is shown, n-1 is the number of the gain expansion units, and i is more than or equal to 0 and less than or equal to n-1.
2. Only 1 power switch is included, and the control strategy and the driving circuit are simple.
Drawings
Fig. 1 is a schematic diagram of the circuit of the present invention.
Fig. 2 is a circuit topology diagram when the number of gain expansion units of the present invention is 2.
Fig. 3 is a schematic diagram of a conventional Zeta converter circuit.
Fig. 4 shows that when the number of gain expansion units is 2, the transformer transformation ratio is 1: the input-output gain at 2 is compared with that of a conventional Zeta converter.
Fig. 5 is a simulation diagram of an output waveform when the input voltage is 30V and the number of gain expansion units is 2 and D is 0.735 according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 2 shows a circuit topology when the number n of gain expansion units is 3 according to the present invention:
a novel high-gain Zeta DC-DC converter comprises a direct current input source, a basic Zeta converter, n-1 gain expansion units and a leakage inductance absorption unit; wherein:
the basic Zeta converter comprises a primary side n and a secondary side n1:n2Three inductors L, Lr、L1Two capacitors C11、C12A power switch S1A diode D1(ii) a The connection form is as follows: power switch S1Is connected to the positive pole of the DC input source, power switch S1Is respectively connected with one end of the inductor L and the inductor LrOne terminal of (1), inductance LrThe other end of the inductor is connected with the lower end of the primary side of the transformer and the negative electrode of the power supply, and the capacitor C11One end of the transformer is connected with the upper end of the secondary side of the transformer, and the other end of the transformer is connected with the inductor L1And a diode D1Is connected to the cathode of the inductor L1Another terminal of (1) and a capacitor C12Connected, diode D1Anode and capacitor C12The other end of the transformer is connected with the lower end of the secondary side of the transformer;
the gain expansion unit and the leakage inductance absorption unit both have the same internal structure, and take the 1 st gain expansion unit as an example, the gain expansion unit includes: an inductance L2A diode D2Two capacitors C21、C22. Wherein, the capacitor C21The other end of the first and second inductors are respectively connected with the inductor L2And a diode D2Is connected to the cathode of the inductor L2Another terminal of (1) and a capacitor C22Are connected at one end.
The connection relationship between the 1 st gain expansion unit and the basic Zeta converter is as follows:
capacitance C in basic Zeta converter11The intersection point of one end of the capacitor C and the upper end of the secondary side of the transformer and the capacitor C in the 1 st gain expansion unit21Is connected to one end of the inductor L in the basic Zeta converter1Another terminal of (1) and a capacitor C12And the intersection point of one end of the first gain expansion unit and the diode D in the 1 st gain expansion unit2Anode and capacitor C22The intersection points of the other ends are connected.
The connection relationship between the leakage inductance absorption unit and the basic Zeta converter is as follows:
inductance L in basic Zeta converterrOne terminal of (A) and a capacitor C in the leakage inductance absorption unit01Is connected with the diode D in the leakage inductance absorption unit0Anode and capacitor C02The other end of the diode is connected with the other end of the diode D in the basic Zeta converter1Anode and capacitor C12And the other end of the second capacitor is connected with the inductance L in the leakage inductance absorption unit0Another terminal of (1) and a capacitor C02The intersections of one end are connected.
Load RPLAre respectively connected with the capacitor C in the (n-1) th gain expansion unitn2And C in the leakage inductance absorbing unit02The other ends of the two are connected;
the gate of the power switch S1 is connected to its controller, and its duty cycle can be varied between 0 and 1. The on-off time of the power switch S1 can be controlled by adjusting the duty ratio, and the output voltage level can be adjusted according to the voltage balance formula of the inductor.
When the current of the inductor L is continuously conducted, the circuit can be divided into 2 working states according to the different states of the power switch:
(1): power switch S1Conducting, diode D0、D1、D2、D3Are all turned off, and the inductor L, L at the moment0、L1、L2、L3Capacitor C02、C12、C22、C32Charging, capacitance C01、C11、C21、C31Discharging; inductor L, L0、L1、L2、L3The terminal voltage is shown as follows:
(2): power switch S1Turn-off, diode D0、D1、D2、D3Are all turned on, and the inductor L, L is at the moment0、L1、L2、L3Capacitor C02、C12、C22、C32Discharge, capacitance C01、C11、C21、C31Charging; inductor L, L0、L1、L2、L3The terminal voltage is shown as follows:
the circuit is divided into 2 working states, and according to the duty ratio of a controller connected to the grid of the power switch S1, the voltage level of each capacitor can be obtained as follows:
fig. 4 is a graph comparing the input/output gain of the gain expansion unit of the present invention with the input/output gain of the conventional Zeta-converter, when the number of gain expansion units is 2. As can be seen from fig. 4, at the same duty cycle, the gain of the converter proposed by the present invention is higher than that of the conventional converter, and a leakage inductance absorption unit can solve the problems of power loss and too high peak value at both ends of the switching tube.
Fig. 5 is a simulation diagram of an output waveform when the input voltage is 30V and the number of gain expansion units is 2 and D is 0.735, and the feasibility of the invention is verified through simulation.
Claims (3)
1. A high-gain Zeta DC-DC converter characterized by: the converter comprises a direct current input source, 1 Zeta converter, 1 leakage inductance absorption unit and n-1 gain expansion units; wherein:
the Zeta converter comprises a primary side n and a secondary side n1:n2Three inductors L, Lr、L1Two capacitors C11、C12A power switch S1A diode D1(ii) a The connection form is as follows: power switch S1Is connected to the positive pole of the DC input source, power switch S1The source electrode of the inductor L is respectively connected with one end of the inductor L and the inductor LrOne terminal of (1), inductance LrThe other end of the inductor L is respectively connected with the lower end of the primary side of the transformer and the negative electrode of the direct current input source, and the capacitor C11One end of the capacitor C is connected with the upper end of the secondary side of the transformer11The other end is respectively connected with the inductor L1One terminal of (1), diode D1Is connected to the cathode of the inductor L1Another terminal of (1) and a capacitor C12Is connected to one terminal of a diode D1Respectively with a capacitor C12The other end of the transformer is connected with the lower end of the secondary side of the transformer;
the 1 st gain expansion unit comprises an inductor L2Diode D2And two capacitors C21、C22(ii) a Wherein, the capacitor C21The other end of the first and second inductors are respectively connected with the inductor L2One terminal of (1), diode D2Is connected to the cathode of the inductor L2Another terminal of (1) and a capacitor C22One end of the two ends are connected; diode D2Anode of (2) is connected with a capacitor C22The other end of (a);
2 nd gain expansion unitComprising an inductance L3Diode D3And two capacitors C31、C32(ii) a Wherein, the capacitor C31The other end of the first and second inductors are respectively connected with the inductor L3One terminal of (1), diode D3Is connected to the cathode of the inductor L3Another terminal of (1) and a capacitor C32One end of the two ends are connected; diode D3Anode of (2) is connected with a capacitor C32The other end of (a);
.... analogize in turn, in the ith gain expansion unit, 1 < i ≦ n-1,
the ith gain expansion unit comprises an inductor L(i+1)Diode D(i+1)And two capacitors C(i+1)1、C(i+1)2(ii) a Wherein, the capacitor C(i+1)1The other end of the first and second inductors are respectively connected with the inductor L(i+1)One terminal of (1), diode D(i+1)Is connected to the cathode of the inductor L(i+1)Another terminal of (1) and a capacitor C(i+1)2One end of the two ends are connected; diode D(i+1)Anode of (2) is connected with a capacitor C(i+1)2The other end of (a);
the leakage inductance absorption unit comprises an inductor L0Diode D0Two capacitors C01、C02(ii) a Wherein, the capacitor C01The other end of the first and second inductors are respectively connected with the inductor L0One terminal of (1), diode D0Is connected to the cathode of the inductor L0Another terminal of (1) and a capacitor C02One end of the two ends are connected;
the connection form between the gain expansion units is as follows:
i is more than 1 and less than or equal to n-1, and the capacitance C in the i-1 th gain expansion uniti2One end of (1), an inductance LiAnd the intersection of the other end of (b) and the capacitance C in the ith gain expansion unit(i+1)2Is connected to the other end of the first gain expansion unit, and a capacitor C in the (i-1) th gain expansion uniti1And the capacitor C in the ith gain expansion unit(i+1)1One end of the two ends are connected;
the connection relationship between the 1 st gain expansion unit and the Zeta converter is as follows:
capacitor C in Zeta converter11The intersection point of one end of the capacitor C and the upper end of the secondary side of the transformer and the capacitor C in the 1 st gain expansion unit21Is connected to one end of the Zeta converter, an inductor L in the Zeta converter1Another terminal of (1) and a capacitor C12And the intersection point of one end of the first gain expansion unit and the diode D in the 1 st gain expansion unit2Anode and capacitor C22The intersection points of the other ends are connected;
the connection relationship between the leakage inductance absorption unit and the Zeta converter is as follows:
inductance L in Zeta converterrOne terminal of (A) and a capacitor C in the leakage inductance absorption unit01Is connected with the diode D in the leakage inductance absorption unit0Anode and capacitor C02The other end of the diode is connected with the other end of the diode D in the Zeta converter1Anode and capacitor C12And the other end of the second capacitor is connected with the inductance L in the leakage inductance absorption unit0Another terminal of (1) and a capacitor C02The intersection points of one end are connected;
load RPLAre respectively connected with the capacitor C in the (n-1) th gain expansion unitn2And C in the leakage inductance absorbing unit02And the other end of the two are connected.
2. A high-gain Zeta DC-DC converter according to claim 1, characterized in that:
the gate of the power switch S1 is connected to a controller, the duty cycle of which varies between 0 and 1.
3. A high-gain Zeta DC-DC converter according to claim 1, characterized in that:
when n is 3, when the current of the inductor L is continuously conducted, the circuit is divided into 2 operating states according to the different power switch states:
(1): power switch S1Conducting, diode D0、D1、D2、D3Are all turned off, and the inductor L, L at the moment0、L1、L2、L3Capacitor C02、C12、C22、C32Charging, capacitance C01、C11、C21、C31Discharging; inductor L, L0、L1、L2、L3The terminal voltage is shown as follows:
(2): power switch S1Turn-off, diode D0、D1、D2、D3Are all turned on, and the inductor L, L is at the moment0、L1、L2、L3Capacitor C02、C12、C22、C32Discharge, capacitance C01、C11、C21、C31Charging; inductor L, L0、L1、L2、L3The terminal voltage is shown as follows:
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| CN113691127B (en) * | 2021-08-29 | 2023-07-11 | 三峡大学 | Single-input high-reliability capacitance-current consistent Boost DC-DC converter |
| CN113890340B (en) * | 2021-09-01 | 2023-10-27 | 三峡大学 | Single-input high-reliability capacitance-current consistent buck-boost DC-DC converter |
| CN113965085B (en) * | 2021-10-11 | 2023-10-27 | 三峡大学 | Single-input high-reliability capacitance-current consistent Cuk DC-DC converter |
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| CN110994992A (en) * | 2019-12-18 | 2020-04-10 | 广东电网有限责任公司 | Expandable gain unit type high-capacity DC/DC converter |
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Application publication date: 20210423 Assignee: NANJING YANXU ELECTRICAL TECHNOLOGY Co.,Ltd. Assignor: CHINA THREE GORGES University Contract record no.: X2023980039976 Denomination of invention: A High Gain Zeta DC-DC Converter Granted publication date: 20220201 License type: Common License Record date: 20230823 |
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