CN113824320A - Boost converter with passive lossless buffer - Google Patents
Boost converter with passive lossless buffer Download PDFInfo
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- CN113824320A CN113824320A CN202111240449.1A CN202111240449A CN113824320A CN 113824320 A CN113824320 A CN 113824320A CN 202111240449 A CN202111240449 A CN 202111240449A CN 113824320 A CN113824320 A CN 113824320A
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- boost converter
- inductor
- resonant
- passive lossless
- lossless snubber
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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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
Abstract
A boost converter with passive lossless buffer comprises a boost converter and a passive lossless buffer, wherein the passive lossless buffer comprises an input end one-way conduction element, a resonance inductor, a resonance capacitor and an output end one-way conduction element. The invention can solve the problems of poor energy conversion efficiency of the hard switching boost converter and complex structure of the soft switching boost converter.
Description
Technical Field
The invention relates to a boost converter with a buffer, in particular to a boost converter with a passive lossless buffer.
Background
The hard switching boost converter in the prior art generates a significant voltage and current overlapping area on the voltage and current waveform diagram during switching, and the voltage and current overlapping area is the switching loss of the switch, which reduces the energy conversion efficiency and increases the temperature of the device.
Later, a soft-switching boost converter of the prior art is proposed, so that the overlapping area of the voltage and the current can be reduced, and further, the energy loss can be reduced; the soft switching boost converter in the prior art reduces the switching loss by slowing down the rising slope or the falling slope of the switching voltage or the switching current; however, the soft-switching boost converter of the prior art has the disadvantages of excessive number of components and complicated structure.
In summary, the conversion efficiency of the energy of the hard-switching boost converter of the prior art is poor, and the structure of the soft-switching boost converter of the prior art is complicated.
Disclosure of Invention
To solve the above problems, an object of the present invention is to provide a boost converter with a passive lossless snubber.
In order to achieve the purpose, the invention provides the following technical scheme: the boost conversion device with the passive lossless buffer comprises:
a boost converter; and
a passive lossless buffer electrically connected to the boost converter,
wherein the passive lossless buffer comprises:
the input end unidirectional conducting element is electrically connected to the boost converter;
the resonant inductor is electrically connected to the input end unidirectional conducting element;
a resonant capacitor electrically connected to the boost converter and the resonant inductor; and
and the output end unidirectional conduction element is electrically connected to the boost converter, the resonance inductor and the resonance capacitor.
Preferably, the boost converter includes:
a first inductor electrically connected to the input end one-way conduction element and the resonant capacitor;
a first transistor switch electrically connected to the first inductor and the resonant capacitor;
a switch controller electrically connected to the first transistor switch; and
a first diode electrically connected to the first transistor switch, the first inductor, the resonant capacitor and the output end one-way conduction element.
Preferably, when the boost converter with passive lossless snubber enters the first action phase, the switch controller is configured to turn on the first transistor switch, and the first inductor is configured to be excited by the input terminal voltage to store the electric energy in the form of a magnetic field, and a first inductor current flowing through the first inductor gradually increases, and the resonant inductor and the resonant capacitor are configured to be charged and resonated by the input terminal voltage, and then the boost converter with passive lossless snubber is configured to enter the second action phase.
Preferably, when the boost converter with passive lossless snubber enters the second action stage, the switch controller is configured to keep the first transistor switch on, and the first inductor is configured to continue to be excited by the input voltage to store the electrical energy in the form of the magnetic field, and the first inductor current flowing through the first inductor continues to increase, and the resonant inductor and the resonant capacitor are configured to continue to be charged and resonate by the input terminal voltage, and the input unidirectional conducting element is configured to make the resonant inductor and the resonant capacitor configured to stop resonating for a half-cycle of resonance, so that the resonant capacitor has a resonant capacitance voltage twice the input voltage, and the resonant inductor current flowing through the resonant inductor is made zero, and then the boost converter with the passive lossless snubber is configured to enter a third operation phase.
Preferably, when the boost converter with passive lossless snubber enters the third action phase, the switch controller is configured to turn off the first transistor switch, and a parasitic capacitance of the first transistor switch is configured to be charged by the first inductor current from zero volts, so that a drain-source voltage of the first transistor switch gradually increases, and the resonant capacitor is configured to discharge, so that the output-end unidirectional conducting element is configured to be forward biased on, and the resonant capacitor voltage is discharged from twice the input-end voltage to zero volts, and the drain-source voltage of the first transistor switch plus the resonant capacitor voltage of the resonant capacitor is equal to an output-end voltage of an output end, and when the resonant capacitor voltage of the resonant capacitor is discharged to zero volts, the first diode is configured to be forward biased on by the first inductor current, and then the boost converter with passive lossless snubber is configured to enter the fourth operation phase.
Preferably, when the boost converter with passive lossless snubber enters the fourth action phase, the switch controller is configured to keep turning off the first transistor switch, and the first diode is configured to continue forward biased conduction by the first inductor current, and the input end unidirectional conduction current flowing through the input end unidirectional conduction element is zero, and the resonant inductor current flowing through the resonant inductor is zero, and the resonant capacitor current flowing through the resonant capacitor is zero, and the output end unidirectional conduction current flowing through the output end unidirectional conduction element is zero, and the electric energy stored in the magnetic field form by the first inductor is transferred to the output end in a current form, and the first inductor current flowing through the first inductor is gradually reduced.
Preferably, the boost converter further includes:
and the input end capacitor is electrically connected to the input end unidirectional conducting element and the first inductor.
Preferably, the boost converter further includes:
and the output end capacitor is electrically connected to the output end unidirectional conducting element and the first diode.
Preferably, the input end one-way conduction element is a diode; the output end one-way conduction device is a diode.
Preferably, the first transistor switch is a metal oxide semiconductor field effect transistor; the switch controller is a pulse width modulation signal controller.
Compared with the prior art, the invention has the advantages that the buffer with a simple structure is utilized to reduce the switching loss of the boost converter and reduce the electromagnetic interference. The invention can absorb the spike (spike) after the switch of the boost converter is turned off and reduce the rising slope of the switch voltage so as to reduce the electromagnetic interference emission intensity caused by the high voltage slope, thereby reducing the switching loss (namely, the overlapping area of the switch voltage and the switch current on the voltage and current oscillogram) when the switch is turned off.
Drawings
Fig. 1 is a block diagram of an embodiment of a boost converter with passive lossless snubber according to the present invention.
FIG. 2 is a block diagram of a boost converter with passive lossless buffers according to the present invention in a first operation stage.
FIG. 3 is a block diagram of a boost converter with a passive lossless buffer according to the present invention in a second operation stage.
FIG. 4 is a block diagram of a boost converter with a passive lossless buffer according to the present invention in a third operation stage.
FIG. 5 is a block diagram of a boost converter with passive lossless buffers according to the present invention in the fourth operation stage.
Fig. 6 is a waveform diagram of the boost converter with passive lossless snubber of the present invention in the first operation stage to the fourth operation stage.
FIG. 7 is a block diagram of a boost converter with passive lossless buffers according to another embodiment of the present invention.
In the figure: 10 boost conversion device with passive lossless buffer, 102 boost converter, 104 passive lossless buffer, 106 switch controller, 108 output terminal, 110 input terminal, C1 input terminal capacitance, C2 resonant capacitor, C3 output terminal capacitance, Coss1 parasitic capacitance, D1 first diode, D2 output terminal unidirectional conductive element, D3 input terminal unidirectional conductive element, iC2 resonant capacitor current, iD1 first diode current, iD2 output terminal unidirectional conductive current, iD3 input terminal unidirectional conductive current, ids1 drain source current, iL1 first inductor current, iL 24 _ pk first inductor peak current, iL1_ vly first inductor current, iL2 resonant inductor current, L599 first inductor, L2 resonant inductor, Q1 first transistor switch, t0 zero time point, t1 first time point, t2 second time point, t3 first inductor, t2 drain voltage, 1 vds voltage, A source voltage of vgs1 gate, a voltage of Vin input terminal, a voltage of a first inductor of vL1, a voltage of a resonant inductor of vL2, a voltage of Vo output terminal, capacitive reactance of resonant capacitor of XC2, and inductive reactance of resonant inductor of XL2
Detailed Description
In the present embodiment, numerous specific details are provided to provide a thorough understanding of embodiments of the invention; one skilled in the relevant art will recognize, however, that the invention can be practiced without one or more of the specific details; in other instances, well-known details are not shown or described to avoid obscuring aspects of the invention. The technical content and the detailed description of the present invention are described below with reference to the drawings:
referring to fig. 1, the boost converter 10 of the present invention includes a boost converter 102 and a passive lossless snubber (snubber, also called as a snubber) 104, the boost converter 102 includes a first inductor L1, a first transistor switch Q1, a switch controller 106, a first diode D1, an input end capacitor C1 and an output end capacitor C3, the passive lossless snubber 104 includes an input end unidirectional conducting element D3, a resonant inductor L2, a resonant capacitor C2 and an output end unidirectional conducting element D2, which are electrically connected to each other. The first transistor switch Q1 can be, for example but not limited to, a MOSFET, the switch controller 106 can be, for example but not limited to, a PWM signal controller, the input unidirectional pass device D3 can be, for example but not limited to, a diode, and the output unidirectional pass device D2 can be, for example but not limited to, a diode.
The boost converter 10 of the present invention comprises four operation stages, which are detailed as follows:
referring to fig. 2, the dotted arrow indicates the current direction; please also refer to fig. 1. When the boost converter 10 with passive lossless snubber enters the first operation phase, the switch controller 106 is configured to turn on the first transistor switch Q1, and the first inductor L1 is configured to be excited by an input terminal voltage Vin to store electrical energy in the form of a magnetic field, and the first inductor current iL1 flowing through the first inductor L1 gradually increases, and the resonant inductor L2 and the resonant capacitor C2 are configured to be charged and resonated by the input terminal voltage Vin, and then the boost converter 10 with passive lossless snubber is configured to enter the second operation phase.
Referring to fig. 3, the dotted arrow indicates the current direction; please also refer to fig. 1. When the boost converter 10 with passive lossless snubber enters the second action phase, the switch controller 106 is configured to keep turning on the first transistor switch Q1, and the first inductor L1 is configured to continue to be excited by the input terminal voltage Vin to store the electrical energy in the form of the magnetic field, and the first inductor current iL1 flowing through the first inductor L1 continues to increase, and the resonant inductor L2 and the resonant capacitor C2 are configured to continue to be charged and resonate by the input terminal voltage Vin, and the input terminal unidirectional conductive element D3 is configured to make the resonant inductor L2 and the resonant capacitor C2 stop resonating for a half-period of resonance, make the resonant capacitor voltage vC2 of the resonant capacitor C2 be twice the input terminal voltage Vin, and make the resonant inductor current iL2 flowing through the resonant inductor L2 be zero, and then the boost converter 10 with passive lossless snubber is configured to enter the third action phase And (4) section.
Referring to fig. 4, the dotted arrow indicates the current direction; please also refer to fig. 1. When the boost converter 10 with passive lossless snubber enters the third operation phase, the switch controller 106 is configured to turn off the first transistor switch Q1, and a parasitic capacitance Coss1 of the first transistor switch Q1 is configured to be charged by the first inductor current iL1 from zero volts, so that a drain voltage vds1 of the first transistor switch Q1 gradually increases, and the resonant capacitor C2 is configured to discharge, so that the output end unidirectional conductive element D2 is configured to be forward biased on, and the resonant capacitor voltage vC2 is discharged from twice the input terminal voltage Vin to zero volts, and the drain voltage vds1 of the first transistor switch Q1 plus the resonant capacitor voltage vC2 of the resonant capacitor C2 is equal to an output terminal voltage Vo of an output end 108, and when the resonant capacitor voltage vC2 of the resonant capacitor C2 discharges to zero volts, the first diode D1 is configured to be forward biased by the first inductor current iL1, and then the boost converter 10 with passive lossless snubber is configured to enter the fourth operation phase.
Referring to fig. 5, the dotted arrow indicates the current direction; please also refer to fig. 1. When the boost converter 10 with passive lossless snubber enters the fourth operation phase, the switch controller 106 is configured to keep turning off the first transistor switch Q1, and the first diode D1 is configured to continue forward biased conduction through the first inductor current iL1, and the input unidirectional conduction current iD3 flowing through the input unidirectional conduction element D3 is zero, and the resonant inductor current iL2 flowing through the resonant inductor L2 is zero, and the resonant capacitor current iC2 flowing through the resonant capacitor C2 is zero, and the output unidirectional conduction current iD2 flowing through the output unidirectional conduction element D2 is zero, and the electric energy stored in the form of the magnetic field by the first inductor L1 is transferred to the output 108 in the form of current, and the first inductor current iL1 flowing through the first inductor L1 is gradually reduced.
Please refer to fig. 6, and also refer to fig. 1 to 5; for ease of explanation, the present invention assumes that these devices are ideal, and that the forward bias voltages of the diodes are all zero volts. In addition to the above symbols, the first transistor switch Q1 has a gate-source voltage vgs1, the current through the first diode D1 is referred to as the first diode current iD1, the current through the first transistor switch Q1 is referred to as the drain-source current ids1, the first inductor L1 has a first inductor voltage vL1, the resonant inductor L2 has a resonant inductor voltage vL2, the peak current of the first inductor current iL1 is a first inductor peak current iL1_ pk, the valley current of the first inductor current iL1 is a first inductor valley current iL1_ vly, the resonant inductor L2 has a resonant inductor XL2, the resonant capacitor C2 has a resonant capacitor XC2, the first operation phase is between the zero time point t0 and the first time point t1, the second operation phase is between the first time point t0 and the third time point 828653, the third operation phase is between the first time point t0 and the third time point 828653, the fourth motion phase is between the third time point t3 and the zeroth time point t 0.
Referring to fig. 7, the elements shown in fig. 7 are the same as those shown in fig. 1 to 6 for the sake of brevity, and the description thereof will not be repeated here. One end of the resonant inductor L2 is directly connected to the input terminal 110, the other end of the resonant inductor L2 is directly connected to the anode of the input unidirectional conductive element D3, and the cathode of the input unidirectional conductive element D3 is directly connected to the output unidirectional conductive element D2 and the resonant capacitor C2.
The invention has the advantages of reducing the switching loss of the boost converter and reducing the electromagnetic interference by using the buffer with a simple structure. The invention can absorb the spike (spike) after the switch of the boost converter is turned off and slow down the rising slope of the switch voltage so as to reduce the electromagnetic interference emission intensity brought by the high voltage slope and reduce the switching loss (namely, the overlapping area of the switch voltage and the switch current on the voltage and current oscillogram) when the switch is turned off; the input end unidirectional conducting device D3, the resonant inductor L2, the resonant capacitor C2 and the output end unidirectional conducting device D2 included in the passive lossless snubber 104 do not participate in the processing of main power and do not exist in the power transmission path, so that the passive lossless snubber 104 only needs very low device rated power, thereby reducing the device size and extra cost. According to the experimental data, under the same peripheral component parameters and full load efficiency, compared with the traditional RCD buffer, the invention can reduce the switching loss by more than 1% and reduce the electromagnetic interference.
However, the above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention should not be limited by the above-mentioned embodiments, and all equivalent variations and modifications made according to the claims of the present invention should be covered by the protection scope of the present invention. The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. In summary, it is understood that the present invention has industrial applicability, novelty and advancement, and the structure of the present invention is not disclosed in the similar products and applications, which completely conform to the requirements of the patent application and are filed by the patent application.
Claims (10)
1. A boost converter with passive lossless snubber, comprising:
a boost converter; and
a passive lossless snubber, the passive lossless snubber being electrically connected to the boost converter, wherein the passive lossless snubber comprises:
the input end unidirectional conducting element is electrically connected to the boost converter;
the resonant inductor is electrically connected to the input end unidirectional conducting element;
a resonant capacitor electrically connected to the boost converter and the resonant inductor; and
and the output end unidirectional conduction element is electrically connected to the boost converter, the resonance inductor and the resonance capacitor.
2. The boost converter device with passive lossless snubber of claim 1, wherein: the boost converter includes:
a first inductor electrically connected to the input end one-way conduction element and the resonant capacitor;
a first transistor switch electrically connected to the first inductor and the resonant capacitor;
a switch controller electrically connected to the first transistor switch; and
a first diode electrically connected to the first transistor switch, the first inductor, the resonant capacitor and the output end one-way conduction element.
3. The boost converter device with passive lossless snubber of claim 2, wherein: when the boost converter with passive lossless snubber enters the first action phase, the switch controller is configured to turn on the first transistor switch, and the first inductor is configured to be excited by the input terminal voltage to store the electric energy in the form of a magnetic field, and a first inductor current flowing through the first inductor gradually increases, and the resonant inductor and the resonant capacitor are configured to be charged and resonated by the input terminal voltage, and then the boost converter with passive lossless snubber is configured to enter the second action phase.
4. The boost converter device with passive lossless snubber of claim 3, wherein: when the boost converter with passive lossless snubber enters the second operation stage, the switch controller is configured to keep the first transistor switch on, and the first inductor is configured to continue to be excited by the input voltage to store the electrical energy in the form of the magnetic field, and the first inductor current flowing through the first inductor continues to increase, and the resonant inductor and the resonant capacitor are configured to continue to be charged and resonate by the input terminal voltage, and the input unidirectional conducting element is configured to make the resonant inductor and the resonant capacitor configured to stop resonating for a half-cycle of resonance, so that the resonant capacitor has a resonant capacitance voltage twice the input voltage, and the resonant inductor current flowing through the resonant inductor is made zero, and then the boost converter with the passive lossless snubber is configured to enter a third operation phase.
5. The boost converter device with passive lossless snubber of claim 4, wherein: when the boost converter with passive lossless snubber enters the third action stage, the switch controller is configured to turn off the first transistor switch, and a parasitic capacitance of the first transistor switch is configured to be charged by the first inductor current from zero volts, so that a drain-source voltage of the first transistor switch gradually increases, and the resonant capacitor is configured to discharge, so that the output-end unidirectional conducting element is configured to be forward biased on, and the resonant capacitor voltage is discharged from twice the input-end voltage to zero volts, and the drain-source voltage of the first transistor switch plus the resonant capacitor voltage of the resonant capacitor is equal to an output-end voltage of an output end, and when the resonant capacitor voltage of the resonant capacitor is discharged to zero volts, the first diode is configured to be forward biased on by the first inductor current, and then the boost converter with passive lossless snubber is configured to enter the fourth operation phase.
6. The boost converter device with passive lossless snubber of claim 5, wherein: when the boost converter with passive lossless snubber enters the fourth action stage, the switch controller is configured to keep turning off the first transistor switch, and the first diode is configured to continue to be forward biased and turned on by the first inductive current, and the input end unidirectional conduction current flowing through the input end unidirectional conduction element is zero, and the resonant inductive current flowing through the resonant inductor is zero, and the resonant capacitive current flowing through the resonant capacitor is zero, and the output end unidirectional conduction current flowing through the output end unidirectional conduction element is zero, and the electrical energy stored by the first inductor in the form of the magnetic field is transferred to the output end in the form of current, and the first inductive current flowing through the first inductor is gradually reduced.
7. The boost converter device with passive lossless snubber of claim 6, wherein: the boost converter further includes:
and the input end capacitor is electrically connected to the input end unidirectional conducting element and the first inductor.
8. The boost converter device with passive lossless snubber of claim 7, wherein: the boost converter further includes:
and the output end capacitor is electrically connected to the output end unidirectional conducting element and the first diode.
9. The boost converter device with passive lossless snubber of claim 8, wherein: the input end one-way conduction device is a diode; the output end one-way conduction device is a diode.
10. The boost converter with passive lossless snubber of claim 9, wherein: the first transistor switch is a metal oxide semiconductor field effect transistor; the switch controller is a pulse width modulation signal controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111240449.1A CN113824320A (en) | 2021-10-25 | 2021-10-25 | Boost converter with passive lossless buffer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111240449.1A CN113824320A (en) | 2021-10-25 | 2021-10-25 | Boost converter with passive lossless buffer |
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| CN113824320A true CN113824320A (en) | 2021-12-21 |
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| CN202111240449.1A Pending CN113824320A (en) | 2021-10-25 | 2021-10-25 | Boost converter with passive lossless buffer |
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