CN205490142U - Switched inductor boost converter - Google Patents
Switched inductor boost converter Download PDFInfo
- Publication number
- CN205490142U CN205490142U CN201620226871.XU CN201620226871U CN205490142U CN 205490142 U CN205490142 U CN 205490142U CN 201620226871 U CN201620226871 U CN 201620226871U CN 205490142 U CN205490142 U CN 205490142U
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- power switch
- inductor
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- inductance
- boost converter
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- 238000010586 diagram Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model relates to a switched inductor boost converter inserts direct -current input power vin, including power switch pipe SW1, power switch pipe SW1's source electrode connects the negative pole of input power, and power switch pipe SW1's drain electrode connects the positive pole of inputing the power through inductance L1 and diode D3's negative pole, the drain electrode of power switch pipe SW1 connect the rectifier diode D4 positive pole after, connect electric capacity cf's one end, power switch pipe SW1's source electrode connects electric capacity cf's the other end, electric capacity cf both ends meet output port VO, the utility model discloses an engineering no matter switched inductor boost converter has in the mode of switching on (CCM) in succession or under the interrupted mode of switching on (DCM) than the higher ability of stepping up of traditional boost converter, is applicable to the power of low outputs such as solar photovoltaic power generation system and fuel cell more in being actual.
Description
Technical Field
The utility model relates to a non-isolated form direct current-direct current converter, especially a switched inductor Boost converter.
Background
The conventional BOOST converter comprises a power switch tube, a BOOST power inductor and a rectifier diode. The drain electrode of the switching power tube is connected with one end of a Boost power inductor and the anode of the rectifier diode, and the other end of the Boost power inductor is connected to the anode of the input power supply.
The gain of the output voltage of the non-isolated DC-DC converter is small, although a higher output voltage can be obtained by setting a larger duty ratio, the further improvement of the output voltage is limited by Boost power inductance and other parasitic factors in a circuit. When the duty cycle thereof is increased to a certain range, there may even occur a case where the output voltage is dropped. Therefore, the duty cycle of the conventional Boost conversion cannot be too large, so that a direct proportional linear relationship between the output voltage and the duty cycle can be obtained.
Disclosure of Invention
The utility model aims at solving the problem that BOOST converter voltage gain is little among the prior art, input current is not enough continuous and input voltage utilization rate is low, switching device stress is high. The switching inductor Boost converter can greatly improve the output Boost capability, has stable output voltage, continuous input current, high input voltage utilization rate and low stress of a switching device.
The technical scheme of the invention is as follows:
a switch inductance Boost converter is connected to a direct current input power Vin and comprises a power switch tube SW1, wherein the source electrode of the power switch tube SW1 is connected with the cathode of an input power supply, and the drain electrode of the power switch tube SW1 is connected with the anode of the input power supply through an inductance L1 and the cathode of a diode D3; the drain of the power switch tube SW1 is connected with the anode of the rectifier diode D4 and then connected with one end of the capacitor Cf, and the source of the power switch tube SW1 is connected with the other end of the capacitor Cf; two ends of the capacitor Cf are connected with the output port VO;
the inductance circuit comprises an L1 inductance branch and an L2 inductance branch which are connected in parallel, and a rectifier diode D2 is connected between the L1 inductance branch and the L2 inductance branch in series;
the L1 inductance branch comprises a rectifier diode D1 and an inductor L1, and the negative electrode of the rectifier diode D1 is connected with one end of the inductor L1; the L2 inductance branch comprises a rectifier diode D3 and an inductor L2, wherein one end of the inductor L2 is connected with the anode of the rectifier diode D3;
the cathode of the rectifying diode D2 is connected between the rectifying diode D1 and the inductor L1, and the anode of the rectifying diode D2 is connected between the rectifying diode D3 and the inductor L2.
The invention has the beneficial effects that:
1. the utility model discloses a switch inductance Boost converter no matter be in Continuous Conduction Mode (CCM) or under Discontinuous Conduction Mode (DCM) all have than traditional Boost converter higher Boost ability to this kind of advantage can be more and more obvious along with the increase of direct duty cycle; therefore, the power supply is more suitable for low-output power supplies such as a solar photovoltaic power generation system, a fuel cell and the like in engineering practice.
2. The utility model discloses switch inductance Boost converter can control through control strategies such as soft switching technique and reduce the conduction loss to further improve work efficiency.
Drawings
Fig. 1 is a circuit diagram of the present invention;
fig. 2 shows an equivalent circuit of the present invention when the power switch SW1 of the present invention is turned on;
fig. 3 shows the equivalent circuit of the present invention when the power switch SW1 is turned off;
fig. 4 is a waveform diagram of the inductor current in the continuous operation mode of the present invention;
fig. 5 is a voltage waveform diagram of the output voltage of the inductor in the continuous operation mode of the present invention;
fig. 6 is a waveform diagram of a current waveform of the inductor L1 in the discontinuous mode according to the present invention;
fig. 7 is a waveform diagram of the current waveform of the rectifier diode D1 in the discontinuous mode of the present invention;
fig. 8 is a graph of the critical value kcrit (d) for the continuous and intermittent modes of operation of the present invention;
fig. 9 is a graph of the present invention in a continuous mode and an intermittent mode of operation;
fig. 10 is a graph of the voltage conversion ratio m (d) of the switched inductor Boost converter of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings, in which, a switching inductor Boost converter shown in fig. 1 is connected to a dc input power Vin, and includes a power switch SW1, a source of the power switch SW1 is connected to a negative electrode of the input power, and a drain of the power switch SW1 is connected to a positive electrode of the input power through an inductor L1 and a negative electrode of a diode D3; the drain of the power switch tube SW1 is connected with the anode of the rectifier diode D4 and then connected with one end of the capacitor Cf, and the source of the power switch tube SW1 is connected with the other end of the capacitor Cf; two ends of the capacitor Cf are connected with the output port VO;
The inductance circuit comprises an L1 inductance branch and an L2 inductance branch which are connected in parallel, and a rectifier diode D2 is connected between the L1 inductance branch and the L2 inductance branch in series;
the L1 inductance branch comprises a rectifier diode D1 and an inductor L1, and the negative electrode of the rectifier diode D1 is connected with one end of the inductor L1; the L2 inductance branch comprises a rectifier diode D3 and an inductor L2, wherein one end of the inductor L2 is connected with the anode of the rectifier diode D3;
the cathode of the rectifying diode D2 is connected between the rectifying diode D1 and the inductor L1, and the anode of the rectifying diode D2 is connected between the rectifying diode D3 and the inductor L2.
The working process and principle of the invention are described below:
when the power switch SW1 is turned on, the rectifier diodes D1 and D3 are turned on, and the rectifier diodes D2 and D4 are forced to be turned off, and the equivalent circuit is as shown in fig. 2. At this time, the inductors L1 and L2 are charged in parallel, and the voltage values are respectively:
when the power switch SW1 is turned off, the rectifier diodes D2 and D4 are turned on, and the rectifier diodes D1 and D3 are forced to be turned off, and the equivalent circuit is as shown in fig. 3. At this time, the inductors L1 and L2 discharge in series, and their voltage values are:wherein,
suppose the switching period of the power switch SW1 is T, the ON time is T1, the OFF time is T2, and T is 1+T2T, then the utility model discloses a straight-through duty cycle isSince the average value of the voltages of the inductors L1 and L2 is 0 in one switching period T, the average value can be obtainedWhere G is the voltage gain of the switched inductor Boost converter.
The switch inductance Boost converter of the utility model has the working conditions similar to those of the traditional Boost converter in the continuous or intermittent conduction mode, the inductive current in the continuous working mode is shown in figure 4, and the output voltage waveform is shown in figure 5; the current stress of all diodes is half that of switching device SW1 and is relatively small. The conduction losses of diodes D1, D2, and D3 are relatively small, and the main reason for affecting SIBC efficiency is the conduction losses of switching device SW1 and diode D4, where the loss of switching device SW1 is 2 times that of diode D4. As can be seen from fig. 4 and 5, the current ripples of the inductors L1 and L2 are as follows;then, the input current ripple and the output voltage ripple have the magnitudes:it can be seen from the equations that the current ripples of the inductors L1 and L2 are relatively small, and the inductance value and the capacitance value can be selected when the inductor current ripple and the output voltage ripple are given.
As can be seen from fig. 6 and 7, the peak current flowing through the inductor L1 is: Wherein T isSIs one switching period, VinFor the input voltage, the average current of the inductor L1 isThe average current value flowing through the diode D1 is:input current ofWhen the current ripple of the input inductor is larger than the average current, the converter enters an intermittent state.
Different from the traditional Boost converter, the utility model discloses continuous operation mode and intermittent operation mode's critical value kcrit (D) are the different functions of direct duty cycle D, and when the current ripple of input inductance was greater than average current, the converter will get into intermittent type state, and the satisfied condition of SIBC work in DCM promptly is: Δ iL＞ILFrom fig. 9, the current ripples of the inductors L1 and L2 are:wherein L is an inductance value, VinIs the input voltage, D is the through duty cycle,the expressions of the input current and the inductive current can be obtained respectively by utilizing the power conservation principle:wherein R is a load resistance, thenThen Δ iL＞ILCan be changed intoIs provided withKcritThe graph of (a) is shown in fig. 8. When K is less than Kcrit(D) When the converter is in discontinuous working mode, when K is more than Kcrit(D) The converter is in a continuous working mode, a curve chart of the converter is shown in fig. 9, and the value relation between the switching of the continuous conduction mode and the discontinuous conduction mode and the switch inductance is clearly established.
The utility model discloses the voltage transformation ratio M of switch inductance Boost converter does:fig. 10 shows their characteristic curves for several different values of K, and it can be seen from fig. 10 that when the switched inductor Boost converter operates in the discontinuous operation mode, the smaller the value of K, the larger the voltage gain, and the larger the voltage gain in the continuous operation mode. It can thus be derived the magnitude of the value K (i.e. the inductance L, the load resistance R and the switching period T)SSize) may affect the converter's operating mode and may provide a reference in the circuit design. Meanwhile, as can be seen from fig. 10, the characteristic of the discontinuous operation mode part is close to linear, and can be approximated as:make the utility model discloses possess very big advantage in the aspect of the control.
Claims (1)
1. A switch inductance Boost converter is connected to a direct current input power Vin, and is characterized in that: the power supply circuit comprises a power switch tube SW1, wherein the source electrode of the power switch tube SW1 is connected with the cathode of an input power supply, and the drain electrode of the power switch tube SW1 is connected with the anode of the input power supply through an inductor L1 and the cathode of a diode D3; the drain of the power switch tube SW1 is connected with the anode of the rectifier diode D4 and then connected with one end of the capacitor Cf, and the source of the power switch tube SW1 is connected with the other end of the capacitor Cf; two ends of the capacitor Cf are connected with the output port VO;
the inductance circuit comprises an L1 inductance branch and an L2 inductance branch which are connected in parallel, and a rectifier diode D2 is connected in series between the L1 inductance branch and the L2 inductance branch;
the L1 inductance branch comprises a rectifier diode D1 and an inductor L1, and the negative electrode of the rectifier diode D1 is connected with one end of the inductor L1; the L2 inductance branch comprises a rectifier diode D3 and an inductor L2, wherein one end of the inductor L2 is connected with the anode of the rectifier diode D3;
the cathode of the rectifying diode D2 is connected between the rectifying diode D1 and the inductor L1, and the anode of the rectifying diode D2 is connected between the rectifying diode D3 and the inductor L2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620226871.XU CN205490142U (en) | 2016-03-23 | 2016-03-23 | Switched inductor boost converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620226871.XU CN205490142U (en) | 2016-03-23 | 2016-03-23 | Switched inductor boost converter |
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| CN205490142U true CN205490142U (en) | 2016-08-17 |
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| CN201620226871.XU Expired - Fee Related CN205490142U (en) | 2016-03-23 | 2016-03-23 | Switched inductor boost converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105634275A (en) * | 2016-03-23 | 2016-06-01 | 西安工业大学 | Boost converter of switch inductor |
| CN109412451A (en) * | 2018-12-30 | 2019-03-01 | 盐城工学院 | A kind of electric power conversion apparatus |
| CN109412450A (en) * | 2018-12-30 | 2019-03-01 | 盐城工学院 | A kind of DC communication electric power conversion apparatus |
| CN116827126A (en) * | 2023-03-23 | 2023-09-29 | 广东工业大学 | High-gain boost converter |
-
2016
- 2016-03-23 CN CN201620226871.XU patent/CN205490142U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105634275A (en) * | 2016-03-23 | 2016-06-01 | 西安工业大学 | Boost converter of switch inductor |
| CN109412451A (en) * | 2018-12-30 | 2019-03-01 | 盐城工学院 | A kind of electric power conversion apparatus |
| CN109412450A (en) * | 2018-12-30 | 2019-03-01 | 盐城工学院 | A kind of DC communication electric power conversion apparatus |
| CN116827126A (en) * | 2023-03-23 | 2023-09-29 | 广东工业大学 | High-gain boost converter |
| CN116827126B (en) * | 2023-03-23 | 2023-11-28 | 广东工业大学 | High-gain boost converter |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160817 |