CN111682778B - Magnetic reset forward converter - Google Patents
Magnetic reset forward converter Download PDFInfo
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- CN111682778B CN111682778B CN202010491544.8A CN202010491544A CN111682778B CN 111682778 B CN111682778 B CN 111682778B CN 202010491544 A CN202010491544 A CN 202010491544A CN 111682778 B CN111682778 B CN 111682778B
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0051—Diode reverse recovery losses
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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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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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)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a magnetic reset forward converter capable of inhibiting reverse charging of an LCD energy storage capacitor connected in series with a secondary side, which comprises a forward converter main circuit and an energy transfer and transmission circuit, wherein the forward converter main circuit comprises a high-frequency transformer T, a switching tube S, a diode D1, a diode D2, an inductor L1 and a capacitor C1, and the energy transfer and transmission circuit comprises a diode D3, a capacitor C2, an inductor L2 and a diode D4. The circuit has simple structure and high reliability, ensures that the capacitor C2 cannot be charged reversely, and reduces reactive power loss; the excitation energy is transferred to the load side, and the conversion efficiency of the transformer is improved; at the same time, the reverse recovery problem of diode D1 can also be eliminated.
Description
Technical Field
The invention belongs to the technical field of switching power supplies, and particularly relates to a magnetic reset forward converter, which is preferably used for inhibiting reverse charging of an LCD energy storage capacitor connected in series with a secondary side.
Background
In many isolated switching power supply conversion topologies, the power level of the forward converter is not limited by the ability of the transformer to store energy relative to the flyback converter; compared with half-bridge and full-bridge converters, the forward converter has fewer components, simpler circuits, lower cost and higher reliability. Therefore, the forward converter circuit is more suitable for being applied to the occasion of low-and-medium-power electric energy conversion because of the advantages of relatively simple structure, lower cost, input-output isolation, high working reliability and the like, and is highly focused in the industry.
However, for a single-tube forward converter, because the single-tube forward converter works in a forward excitation state, the high-frequency transformer core is magnetized unidirectionally, and the single-tube forward converter has no magnetic reset function, so that the single-tube forward converter is very likely to cause the problems of core saturation and the like. The result of magnetic saturation will be a sudden increase in the current through the switching tube and even damage to the switching tube, which limits the spread of forward converters to a large extent, so that special magnetic reset circuits or energy transfer circuits must be added to avoid core saturation.
The main working mechanism of the magnetic reset circuit is to transfer excitation energy in the switching-off time of each period, and the excitation energy can be consumed on other devices or returned to an input power supply or transmitted to a load end. The variety of magnetic reset circuits adopted by the existing forward converters is more and roughly divided into three types, one is that a reset winding is accessed to an input end, so that energy is returned to an input power supply; the second is to connect the reset circuits such as RCD, LCD, etc. on the primary side of the transformer to consume energy or return to the input end; and thirdly, taking reset measures on the secondary side, and transferring energy to an output end. The traditional RCD clamping circuit is simpler, and has the defects that excitation energy is consumed in a clamping resistor, so that the overall efficiency of the system is difficult to improve; the active clamp technology realizes magnetic reset, which is a method with excellent performance, but increases the complexity, design difficulty and cost of the converter circuit; the magnetic reset winding reset method is mature and reliable in technology, excitation energy can be returned to an input power supply, but the magnetic reset winding increases the complexity of a transformer structure and increases the voltage stress of a power switch tube. The existing secondary side resetting method comprises the following steps: or the complex of a reset winding or a circuit is required to be added, so that the design and manufacturing difficulties and the cost of the transformer or the circuit are increased; or more diodes are needed to realize energy transfer, so that the circuit loss is increased; or the working mode of the forward inductor or other electrical performance indexes can be influenced, and the high-power transmission is not facilitated. Therefore, in order to further popularize and apply the forward converter, solve the magnetic reset problem, improve the comprehensive performance of the forward converter, and research the new magnetic reset mode aiming at the defects existing in other reset modes is a subject to be continuously discussed.
Disclosure of Invention
The invention aims to solve the technical problems of low utilization rate of excitation energy, complex circuit composition, large loss and low efficiency of the traditional magnetic reset circuit.
In order to solve the technical problems, the invention adopts the following technical scheme: a magnetic reset forward converter comprises a forward converter main circuit (1) and an energy transfer and transmission circuit (2) connected with the forward converter main circuit (1); the positive-side voltage source of the switching tube S is a negative voltage input end IN-of the positive-side converter main circuit (1) and is connected with a negative voltage output end of an external power supply, a grid electrode of the switching tube S is connected with an output end of an external controller, a homonymous end of a secondary side of the high-frequency transformer T is connected with an anode of the diode D2, a cathode of the diode D2 is connected with one end of the diode D1 and one end of the inductor L1, and the other end of the inductor L1 is connected with one end of the capacitor C1 and is connected with one end of the positive-side voltage output end OUT-of the positive-side converter main circuit (1) and is connected with one end of the negative voltage output end OUT-of the positive-side converter main circuit (1); the energy transfer and transmission circuit (2) comprises a diode D3, a capacitor C2, an inductor L2 and a diode D4, wherein the anode of the diode D3 is connected with the synonym end of the secondary side of the high-frequency transformer T, the cathode of the diode D3 is connected with the second end of the capacitor C2, the first end of the capacitor C2 is connected with the anode of the diode D2, one end of the inductor L2 is connected with the cathode of the diode D1, the other end of the inductor L2 is connected with the second end of the capacitor C2, and the anode of the diode D4 is connected with the first end of the capacitor C2 of the energy transfer and transmission circuit (2) and the cathode of the diode D is connected with the second end of the capacitor C2.
Among them, the preferred scheme is: the diodes D1, D2 are fast recovery diodes.
Among them, the preferred scheme is: the switch tube S is a full-control power semiconductor device.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a magnetic reset forward converter of magnetic reset forward converter, the magnetic reset forward converter is applied to in the magnetic reset forward converter, the electric capacity C2 of magnetic reset forward converter is selected according to first selection step, and the concrete step includes:
step 101, selecting the capacitance C of the excitation energy storage capacitor C2 2 ；
Step 102, root calculates withstand voltage value V of capacitor C2 C2,max ；
Step 103, selecting the capacitance value as C 2 And withstand voltage value is greater than V C2,max As the capacitance C2.
Among them, the preferred scheme is: the inductance L2 of the magnetic reset forward converter is selected according to the second selection step; the second selecting step includes:
step 201, determining the current of the inductor L2;
step 202, determining the inductance value L of the inductance L2 2 Is a value range of (a);
step 203, selecting an inductor L2 satisfying the inductance and the overcurrent capability according to step 201 and step 202.
Among them, the preferred scheme is: the diode D3 and the diode D4 of the magnetic reset forward converter are designed and selected according to the third selection step; the third selecting step includes:
step 301, calculating the maximum current I flowing through diode D3 D3,max ；
Step 302, calculating the withstand voltage V of the diode D3 D3,max ；
Step 303, according to the maximum current I flowing through diode D3 D3,max And withstand voltage V of diode D3 D3,max Selecting a diode D3;
step 304, calculating the maximum current I flowing through diode D4 D4,max ；
Step 305, calculating the withstand voltage V of the diode D4 D4,max ；
Step 306, according to the maximum current I flowing through diode D4 D4,max And withstand voltage V of diode D4 D4,max Diode D4 is selected.
Compared with the prior art, the invention has the following advantages:
1. the magnetic reset forward converter capable of inhibiting reverse charging of the secondary side series connection LCD energy storage capacitor realizes that excitation energy is transferred to a load side, improves the utilization rate of the excitation energy of the transformer, and improves the overall efficiency of the converter.
2. The excitation energy storage process and the release process pass through 1 diode, so that the diode loss is reduced compared with the conventional secondary side reset forward converter;
3. the inductor L2 can work CCM and DCM at the same time, which is beneficial to the inductor L1 to work in CCM and is suitable for high-power output.
4. The capacitor C2 and the capacitor L2 form a branch circuit to only transmit excitation energy, and the value of the capacitor L2 can be smaller, so that the high power density of the converter is realized, and the cost of the converter is reduced.
5. Diode D4 suppresses reverse charging of capacitor C2 and reduces reactive power loss of the converter.
6. The diode D1 has no reverse recovery problem, and reduces the loss caused by surge current and reverse recovery process.
7. The magnetic reset forward converter which is designed and realized by the invention and can inhibit the reverse charging of the secondary side series connection LCD energy storage capacitor has the advantages of high working stability and reliability, simple circuit, no need of complex control and wider popularization value.
8. The magnetic reset forward converter designed by the invention can inhibit reverse charging of the secondary side series connection LCD energy storage capacitor, resets relative to the auxiliary winding, and reduces the design difficulty of the transformer.
In conclusion, the circuit disclosed by the invention has the advantages of simple structure, convenience in implementation, low cost, simple working mode, high working stability and reliability, long service life, low power consumption, high transformer utilization rate and high energy transmission efficiency, can improve the working safety and reliability of a switching power supply, and has strong practicability and high popularization and application value.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
Fig. 1 is a schematic circuit diagram of a magnetically reset forward converter of the present invention.
Reference numerals illustrate:
1-a main circuit of a forward converter; 2-energy transfer and transmission circuit.
Detailed Description
As shown in fig. 1, the magnetically reset forward converter of the present invention can inhibit reverse charging of secondary side series connection LCD storage capacitor, and comprises a main forward converter circuit 1 and an energy transfer and transmission circuit 2 connected with the main forward converter circuit 1; the positive-excitation converter main circuit 1 comprises a high-frequency transformer T, a switch tube S, a diode D1, a diode D2, an inductor L1 and a capacitor C1, wherein the homonymous end of the primary side of the high-frequency transformer T is an anode voltage input end IN+ of the positive-excitation converter main circuit 1 and is connected with an anode output end of an external power supply, the heteronymous end of the primary side of the high-frequency transformer T is connected with a drain electrode of the switch tube S, a source of the switch tube S is a cathode voltage input end IN-of the positive-excitation converter main circuit 1 and is connected with a cathode output end of an external power supply, a grid electrode of the switch tube S is connected with an output end of an external controller, the homonymous end of the secondary side of the high-frequency transformer T is connected with an anode of the diode D2, a cathode of the diode D2 is connected with one end of the diode D1 and one end of the inductor L1, the other end of the inductor L1 is connected with one end of the capacitor C1 and is an anode voltage output end OUT+ of the positive-excitation converter main circuit 1, and the homonymous end OUT of the high-frequency transformer T is connected with the anode voltage output end OUT of the positive-excitation converter main circuit 1 and is connected with the anode voltage output end OUT of the positive-excitation converter main circuit 1; the energy transfer and transmission circuit 2 comprises a diode D3, a capacitor C2, an inductor L2 and a diode D4, wherein the anode of the diode D3 is connected with the synonym end of the secondary side of the high-frequency transformer T, the cathode of the diode D3 is connected with the second end of the capacitor C2, the first end of the capacitor C2 is connected with the anode of the diode D2, one end of the inductor L2 is connected with the cathode of the diode D1, the other end of the inductor L2 is connected with the second end of the capacitor C2, the anode of the diode D4 is connected with the first end of the capacitor C2 of the energy transfer and transmission circuit 2, and the cathode of the diode D4 is connected with the second end of the capacitor C2.
In particular, the load RL is connected between the positive voltage output terminal out+ and the negative voltage output terminal OUT-of the main circuit 1 of the forward converter. In the forward converter main circuit 1, both the inductor L1 and the capacitor C1 are used for filtering.
In this embodiment, the diodes D1 and D2 are fast recovery diodes. The diode D2 is used for freewheeling.
In this embodiment, the switching tube S is a fully-controlled power semiconductor device.
The working principle of the embodiment is as follows:
before analyzing the working principle of the present embodiment, it is assumed that the inductances L1, L2, lw2 all operate in CCM. The working principle of the embodiment is analyzed here by dividing the switching tube into an on period and an off period. And for convenience of description of the principle, the following convention is made: for the capacitor C2, it is assumed that the voltage is positive and negative to the left and positive to the right as a forward voltage, and the voltage is negative and negative to the left and right as a reverse voltage; for the secondary winding w2, it is assumed that its current is forward from bottom to top and reverse from top to bottom.
1. Working principle of switching tube S in on period
Assuming that the exciting current Lw2 falls to a minimum value (non-zero) before the switch on time, the C2 forward voltage is maximum, and both L1 and L2 fall to a minimum value. D3 is on, and D1, D2, and D4 are all off.
The first stage: forward energy transfer (C2 transfer energy to L2)
After the switching tube is conducted, input voltage Vi is applied to two ends of a primary winding of the transformer, voltage coupled to a secondary winding w2 is positive and negative, D2 is conducted, and positive excitation energy provides energy for a load through an inductor L1. Since D2 is on, the C2, L2 series branch is shorted, C2 releases energy to inductor L2 until the C2 forward voltage drops to zero, ending this phase. During this process, D4 remains off by being subjected to the C2 reverse voltage.
And a second stage: forward energy transfer (L2 current maintenance)
After the forward voltage of the capacitor C2 drops to zero, the capacitor D4 is naturally conducted (zero voltage and zero current are conducted), the capacitor D2 is still kept conducting, the capacitor L2, the capacitor C2 and the capacitor D4 are short-circuited, and the current L2 is unchanged. The forward energy continues to provide energy to the load through D2 and L1, the L1 current continues to rise until the L1 current reaches a maximum value when the switch is turned off, and the stage is finished.
2. Energy transmission process and working principle during switching tube S off period
The first stage: charging of the parasitic capacitance Cc of the switching tube
After the switching tube driving signal is changed from the high level to the low level, the switching tube enters an off period. In the process of switching tube from on to off, exciting current and secondary side reflection current charge parasitic capacitance Cc of the switching tube, primary and secondary side voltages of the transformer are reduced until the secondary side voltage is reduced to zero, and the stage is finished. At this stage, D2, D4 remain on and D1, D3 are off.
And a second stage: only the L1 freewheel provides energy to the load (L2 current is constant)
After the secondary voltage is reduced to zero, the diode D3 is turned on, the secondary winding of the transformer charges the capacitor C2 positively, the forward voltage of the secondary winding is gradually increased from zero, and the diode D4 is turned off. In this process, D1 is turned on, the inductor L1 freewheels through D1 to continue to supply energy to the load, and the L1 current drops linearly. Since both D1 and D3 are kept on, the inductor L2 current remains unchanged until D1 is naturally turned off when L1 current drops to L2 current, and the stage ends. In this stage, when the L1 current drops to the L2 current, D1 is naturally turned off, and zero current turn-off of D1 is realized.
And a third stage: l1, L2 freewheel simultaneously and supply energy to the load
After the inductor L1 current drops to equal the L2 current, D1 turns off. Thereafter, D3 remains on, while the inductors L1, L2 freewheel through D3 and provide energy to the load. And when the switching tube S is conducted, the currents L1 and L2 are reduced to the minimum value, the voltage at the two ends of C2 is maximum, the current of the secondary winding Lw2 is reduced to the minimum value, and the process is ended.
In this embodiment, the capacitor C2 is selected according to the first selecting step; the first selecting step includes:
step 101, according to the formula
Selecting the capacitance C of the excitation energy storage capacitor C2 2
Step 102, calculating the withstand voltage V of the capacitor C2 according to the formula (A1) C2,max ；
Wherein, the liquid crystal display device comprises a liquid crystal display device,
d is the duty ratio of the switching tube S, n is the turn ratio of the primary winding and the secondary winding of the high-frequency transformer T, L m The exciting inductance of the primary winding of the high-frequency transformer T, f is the working frequency of the main circuit 1 of the forward converter, V i Inputting voltage to the main circuit 1 of the forward converter;
step 103, selecting the capacitance value as C 2 And withstand voltage value is greater than V C2,max As the capacitance C2.
In this embodiment, the inductance L2 is selected; the second selecting step includes:
step 201, determining the current of the inductor L2 according to the formula (A2)
Step 202, determining the inductance value L of the inductance L2 according to the formula (A3) 2 Is a value range of (a);
wherein I is L2 For the current flowing through the inductance L2, V o Is the output voltage of the forward converter main circuit 1;
step 203, selecting an inductor L2 satisfying the inductance and the overcurrent capability according to step 201 and step 202.
In this embodiment, the parameters of the diodes D1 to D4 are designed and model-selected; the third selecting step includes:
step 301, calculating the maximum current I flowing through the diode D3 according to formula (A10) D3,max ；
Step 302, calculating the withstand voltage V of the diode D3 according to the formula (A11) D3,max ；
Wherein I is L1,max Maximum current for the primary winding of the high frequency transformer T;
step 303, according to the maximum current I flowing through diode D3 D3,max And withstand voltage V of diode D3 D3,max Diode D3 is selected.
Step 304, calculating the maximum current I flowing through the diode D4 according to the formula (A12) D4,max ；
Step 305, calculating the withstand voltage V of the diode D4 according to the formula (A13) D4,max ；
Step 306, according to the maximum current I flowing through diode D4 D4,max And withstand voltage V of diode D4 D4,max Diode D4 is selected.
Of course, the foregoing description is only for illustrating the feasibility of the technical solution of the present invention, and the principles of one of the working modes and the corresponding formulas thereof are listed, but not the only and limiting description is used by reference only.
It should be specifically noted that the above embodiments are merely for illustrating the technical solution of the present invention, and not for limiting the same, and it is possible for those skilled in the art to modify the technical solution described in the above embodiments or to make equivalent substitutions for some of the technical features thereof; all such modifications and substitutions are intended to be included within the scope of this disclosure as defined in the following claims.
Claims (6)
1. The utility model provides a magnetic reset forward shock converter can restrain vice limit series connection LCD energy storage capacitor reverse charge which characterized in that: comprises a forward converter main circuit (1) and an energy transfer and transmission circuit (2) connected with the forward converter main circuit (1); the positive-side voltage source of the switching tube S is a negative voltage input end IN-of the positive-side converter main circuit (1) and is connected with a negative voltage output end of an external power supply, a grid electrode of the switching tube S is connected with an output end of an external controller, a homonymous end of a secondary side of the high-frequency transformer T is connected with an anode of the diode D2, a cathode of the diode D2 is connected with one end of the diode D1 and one end of the inductor L1, and the other end of the inductor L1 is connected with one end of the capacitor C1 and is connected with one end of the positive-side voltage output end OUT-of the positive-side converter main circuit (1) and is connected with one end of the negative voltage output end OUT-of the positive-side converter main circuit (1); the energy transfer and transmission circuit (2) comprises a diode D3, a capacitor C2, an inductor L2 and a diode D4, wherein the anode of the diode D3 is connected with the synonym end of the secondary side of the high-frequency transformer T, the cathode of the diode D3 is connected with the second end of the capacitor C2, the first end of the capacitor C2 is connected with the anode of the diode D2, one end of the inductor L2 is connected with the cathode of the diode D1, the other end of the inductor L2 is connected with the second end of the capacitor C2, and the anode of the diode D4 is connected with the first end of the capacitor C2 of the energy transfer and transmission circuit (2) and the cathode of the diode D is connected with the second end of the capacitor C2.
2. The magnetically-resettable forward converter of claim 1, wherein: the diodes D1, D2 are fast recovery diodes.
3. The magnetically-resettable forward converter of claim 1, wherein: the switch tube S is a full-control power semiconductor device.
4. The magnetically-resettable forward converter of claim 1, wherein: the capacitor C2 of the magnetic reset forward converter is selected according to a first selection step, and the specific steps include:
step 101, selecting the capacitance C of the excitation energy storage capacitor C2 2 ；
Step 102, calculating the withstand voltage V of the capacitor C2 C2,max ；
Step 103, selecting the capacitance value as C 2 And withstand voltage value is greater than V C2,max As the capacitance C2.
5. The magnetically-resettable forward converter of claim 4, wherein: the inductance L2 of the magnetic reset forward converter is selected according to the second selection step; the second selecting step includes:
step 201, determining the current of the inductor L2;
step 202, determining the inductance value L of the inductance L2 2 Is a value range of (a);
step 203, selecting an inductor L2 satisfying the inductance and the overcurrent capability according to step 201 and step 202.
6. The magnetically-resettable forward converter of claim 4 or 5, wherein: the diode D3 and the diode D4 of the magnetic reset forward converter are designed and selected according to the third selection step; the third selecting step includes:
step 301, calculating the maximum current I flowing through diode D3 D3,max ；
Step 302, calculating the withstand voltage V of the diode D3 D3,max ；
Step 303, rootAccording to the maximum current I flowing through diode D3 D3,max And withstand voltage V of diode D3 D3,max Selecting a diode D3;
step 304, calculating the maximum current I flowing through diode D4 D4,max ；
Step 305, calculating the withstand voltage V of the diode D4 D4,max ；
Step 306, according to the maximum current I flowing through diode D4 D4,max And withstand voltage V of diode D4 D4,max Diode D4 is selected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010491544.8A CN111682778B (en) | 2020-06-02 | 2020-06-02 | Magnetic reset forward converter |
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| CN202010491544.8A CN111682778B (en) | 2020-06-02 | 2020-06-02 | Magnetic reset forward converter |
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| CN111682778A CN111682778A (en) | 2020-09-18 |
| CN111682778B true CN111682778B (en) | 2023-06-30 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915060A (en) * | 2016-05-03 | 2016-08-31 | 西安科技大学 | Forward conversion circuit with secondary winding magnetic reset function and reset method thereof |
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| US8743565B2 (en) * | 2012-07-27 | 2014-06-03 | Flextronics Ap, Llc | High power converter architecture |
| EP2822166B1 (en) * | 2013-07-01 | 2016-04-06 | Siemens Aktiengesellschaft | Forward converter with snubber circuit at the secondary side |
| CN105703627B (en) * | 2016-05-03 | 2018-05-08 | 西安科技大学 | The design method of secondary simplex winding Self-resetting forward conversion circuit |
| CN110829843A (en) * | 2019-11-13 | 2020-02-21 | 东莞南方半导体科技有限公司 | LCD clamping single tube forward converter and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105915060A (en) * | 2016-05-03 | 2016-08-31 | 西安科技大学 | Forward conversion circuit with secondary winding magnetic reset function and reset method thereof |
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