CN109309448B - Wide-input wide-output Cuk DC-DC converter - Google Patents

Wide-input wide-output Cuk DC-DC converter Download PDF

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Publication number
CN109309448B
CN109309448B CN201811393711.4A CN201811393711A CN109309448B CN 109309448 B CN109309448 B CN 109309448B CN 201811393711 A CN201811393711 A CN 201811393711A CN 109309448 B CN109309448 B CN 109309448B
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converter
diode
capacitor
input
right end
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CN109309448A (en
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邾玢鑫
黄煜
胡施施
黄悦华
佘小莉
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China Three Gorges University CTGU
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China Three Gorges University CTGU
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/005—Conversion of dc power input into dc power output using Cuk converters

Abstract

The invention provides a wide-input wide-output Cuk DC-DC converter. The proposed converter consists of a basic Cuk converter and a number of proposed gain expansion units. The gain expansion unit consists of an inductor, two capacitors and a diode, and the input/output gain 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 driving circuit, wide input and output voltage regulation range, voltage stress of a switching device and the like, and is suitable for application occasions with larger input or output voltage variation range.

Description

Wide-input wide-output Cuk DC-DC converter
Technical Field
The invention relates to a wide input and output buck-boost DC/DC converter, in particular to a wide input and wide output Cuk DC-DC converter.
Background
In the application occasions with larger input and output voltage variation, the input voltage can be higher than the output voltage and also can be lower than the output voltage, and the applicable common non-isolated Buck-boost DC-DC converter comprises a Buck-Boost, cuk, sepic circuit and a Zeta circuit. Theoretically, by adjusting the duty ratio D, the input/output gain of these converters can be changed from zero to infinity, but the boosting capability of these converters is greatly limited due to the influence of parasitic parameters of components and circuits. The current scheme for improving the input and output gains of the DC-DC converter is mostly constructed based on Boost circuits, so that the circuits can only generally realize boosting and cannot realize reducing, and the circuit is difficult to be applied to the application occasions with large input and output voltage changes. Therefore, the research can realize high-gain boosting and simultaneously realize the novel wide-input-output buck-boost DC/DC converter with buck and has important significance.
Disclosure of Invention
In order to solve the problem that the existing non-isolated high-gain DC-DC converter can not realize high-gain boosting and voltage reducing simultaneously, the invention provides a wide input/output boosting and voltage reducing DC/DC converter based on a basic Cuk circuit.
The technical scheme adopted by the invention is as follows:
a wide input wide output Cuk DC-DC converter includes a DC input source, a load R L A basic Cuk converter, n extension units. Wherein:
the basic Cuk converter comprises two inductors L 1 、L 2 Two capacitors C 1 、C 2 A power switch S 1 One diode D 1 . The connection form is as follows: inductance L 1 The left end of the power switch is connected with the anode of the input power supply, and the right end of the power switch is connected with the power switch S 1 Drain of (d) and capacitor C 1 Capacitance C at left end of (2) 1 Right end of (2) and inductance L 2 Left end of (D) and diode D 1 Anode of (C) is connected with inductance L 2 Right end of (C) and capacitor C 2 Is connected with the upper end of the power switch S 1 Source of (D) diode D 1 Cathode of (d) and capacitor C 2 Is connected with the negative electrode of the input power supply.
The components and internal connection forms of the n expansion units are the same, and the i expansion unit is taken as an example, and the n expansion units comprise: inductance L i1 One diode D i1 Two capacitors C i1 、C i2 . Wherein the capacitance C i1 Right end of (2) and inductance L i1 Left end of (D) and diode D i1 Anode of (C) is connected with inductance L i1 Right end of (C) and capacitor C i2 Is connected to the upper end of the frame.
The connection form between the respective expansion units is as follows (1<i.ltoreq.n): capacitor C in the i-1 expansion unit (i-1)1 Right end of (d) inductance L (i-1)1 Left end of (D) and diode D (i-1)1 The intersection of the anode connections to the capacitor C in the ith expansion cell i1 Is connected to the left end of the (i-1) th extension unit (i-1)1 Right end of (C) and capacitor C (i-1)2 The intersection point connected with the upper end of the (i) th expansion unit and the diode D in the (i) th expansion unit i1 Is connected with the cathode of the (i-1) th expansion unitCapacitor C (i-1)2 Capacitor C in the lower end of (C) and i-th expansion unit i2 Is connected to the negative electrode of the input power source.
The connection relationship between the 1 st expansion unit and the basic Cuk converter is as follows: capacitor C in basic Cuk converter 1 Right end of (2) and inductance L 2 Left end of (D) and diode D 1 The intersection of the anode connections to the capacitor C in the 1 st expansion unit 11 Is connected to the left end of the inductor L in the basic Cuk converter 2 Right end of (C) and capacitor C 2 The intersection point of the upper end connection of (C) and the diode D in the 1 st expansion unit 11 Is connected to the cathode of the battery.
Load R L Capacitor C in the (n) th expansion unit and both ends of n2 Is connected at both ends.
Power switch S 1 The gate of which is connected to its controller and the duty cycle of which can vary from 0 to 1.
The invention relates to a wide input and output buck-boost DC/DC converter, which has the following technical effects:
1. the voltage boosting and dropping can be realized at the same time, the input and output gain is high, and the voltage stress of the switching device is low. Specifically, the following (inductance L) 1 When the current of (c) is continuously on):
the input/output gain is:
the voltage stress of the switching tube is as follows:
wherein D is the duty cycle, u in For input voltage u o To output voltage u s For power switch voltage stress, n is the number of extension units.
2. Only 1 power switch is contained, and the control strategy and the driving circuit are simple.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is a circuit topology diagram of the present invention when the number of extension units is 1.
FIG. 3 is a schematic diagram of a conventional Cuk converter circuit
Fig. 4 is a graph showing the comparison between the input/output gain of the expansion unit number of the present invention and the input/output gain of the conventional Cuk converter.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Fig. 2 shows a circuit topology diagram of the invention when the number of extension units is 1:
a wide input wide output Cuk DC-DC converter includes a DC input source, a load R L A basic Cuk converter and an expansion unit. Wherein:
the basic Cuk converter comprises two inductors L 1 、L 2 Two capacitors C 1 、C 2 A power switch S 1 One diode D 1 . The connection form is as follows: inductance L 1 The left end of the power switch is connected with the anode of the input power supply, and the right end of the power switch is connected with the power switch S 1 Drain of (d) and capacitor C 1 Capacitance C at left end of (2) 1 Right end of (2) and inductance L 2 Left end of (D) and diode D 1 Anode of (C) is connected with inductance L 2 Right end of (C) and capacitor C 2 Is connected with the upper end of the power switch S 1 Source of (D) diode D 1 Cathode of (d) and capacitor C 2 Is connected with the negative electrode of the input power supply.
The expansion unit comprises: inductance L 11 One diode D 11 Two capacitors C 11 、C 12 . Wherein the capacitance C 11 Right end of (2) and inductance L 11 Left end of (D) and diode D 11 Anode of (C) is connected with inductance L 11 Right end of (C) and capacitor C 12 Is connected to the upper end of the capacitor C 12 Is connected with the negative electrode of the input power supply.
The connection relationship between the expansion unit and the basic Cuk converter is as follows: capacitor C in basic Cuk converter 1 Right end of (2) and inductance L 2 Left end of (D) and diode D 1 The intersection of the anode connections of (C) and the capacitance of (C) in the extension unit 11 Is connected at the left end of the baseInductance L in Cuk converter 2 Right end of (C) and capacitor C 2 The intersection point connected with the upper end of the (D) diode and the diode in the expansion unit 11 Is connected to the cathode of the battery.
Load R L Both ends of (a) and the capacitor C in the extension unit 12 Is connected at both ends.
Power switch S 1 The gate of which is connected to its controller and the duty cycle of which can vary from 0 to 1.
At inductance L 1 When the current of the power switch is continuously conducted, the circuit can be divided into 2 working states according to different power switch states:
(1) Power switch S 1 Conduction, diode D 1 、D 11 All turn off, at this time the inductor L 1 、L 2 、L 11 Capacitance C 2 、C 12 Charging, capacitor C 1 、C 11 Discharging; inductance L 1 、L 2 、L 11 The terminal voltage is shown as follows:
(2) Power switch S 1 Turn-off, diode D 1 、D 11 All are conducted, at this time the inductance L 1 、L 2 、L 11 Capacitance C 2 、C 12 Discharging, capacitance C 1 、C 11 Charging; inductance L 1 、L 2 、L 11 The terminal voltage is shown as follows:
the above examples of embodiments of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. Not all embodiments are exhaustive. All obvious changes and modifications which are introduced are still within the scope of the present invention.

Claims (1)

1. A wide input and wide output Cuk DC-DC converter is characterized in that: the converter comprises a DC input source, a loadR L A basic Cuk converter,na plurality of expansion units; wherein:
the basic Cuk converter comprises two inductorsL 1 、L 2 Two capacitorsC 1 、C 2 A power switch S 1 One diode D 1 The method comprises the steps of carrying out a first treatment on the surface of the The connection form is as follows: inductanceL1, the left end is connected with the positive electrode of the input power supply, and the right end is connected with the power switch S 1 Drain electrode of (d) and capacitorC 1 Left end of (2) capacitanceC 1 Right end of (d) and inductorL2 and diode D 1 Anode connection, inductanceL2, right end and capacitorC 2 Is connected with the upper end of the power switch S 1 Source of (D) diode D 1 Cathode and capacitor of (a)C 2 The lower end of the power supply is connected with the negative electrode of the input power supply;
nthe components and the internal connection forms of the expansion units are the same, 1<i≤nThe method comprises the steps of carrying out a first treatment on the surface of the First, theiThe expansion unit comprises: inductanceL i1 One diode D i1 Two capacitorsC i1 、C i2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein the capacitorC i1 Right end of (d) and inductorL i1 Left end of (D) and diode D i1 Anode connection, inductanceL i1 Right end of (d) and capacitorC i2 Is connected with the upper end of the connecting rod;
the connection form between the expansion units is as follows:
first, thei-capacitance in 1 expansion unitC (i-1)1 Right end of (2) inductanceL (i-1)1 Left end of (D) and diode D (i-1)1 The intersection point of the anode connection with the firstiCapacitance in a plurality of expansion unitsC i1 Is connected to the left end of (a)i-1 inductance in expansion unitL (i-1)1 Right end of (d) and capacitorC (i-1)2 The intersection point connected with the upper end of (a)iDiodes D in the expansion units i1 Is connected with the cathode of the firsti-capacitance in 1 expansion unitC (i-1)2 Lower end and the firstiCapacitance in a plurality of expansion unitsC i2 The lower end of the power supply is connected with the negative electrode of the input power supply;
the connection relationship between the 1 st expansion unit and the basic Cuk converter is as follows:
capacitance in basic Cuk converterC 1 Right end of (d) and inductorL2 and diode D 1 The intersection of the anode connections to the capacitor in the 1 st expansion unitC 11 Is connected to the left end of the basic Cuk converterL2, right end and capacitorC 2 The intersection point of the upper end connection of (C) and the diode D in the 1 st expansion unit 11 Is connected with the cathode of the battery;
load(s)R L Both ends and the firstnCapacitance in a plurality of expansion unitsC n2 Is connected with two ends of the connecting rod;
the gate of the power switch S1 is connected to its controller and its duty cycle varies between 0 and 1.
CN201811393711.4A 2018-11-21 2018-11-21 Wide-input wide-output Cuk DC-DC converter Active CN109309448B (en)

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111431399B (en) * 2020-04-30 2023-06-02 三峡大学 Scalable Cuk DC-DC converter
CN111786555B (en) * 2020-07-22 2021-11-02 福州大学 Zero-ripple high-gain DC-DC converter based on novel boosting unit
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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