CN111682778A - Magnetic reset forward converter capable of inhibiting reverse charging of secondary side series LCD energy storage capacitor - Google Patents
Magnetic reset forward converter capable of inhibiting reverse charging of secondary side series LCD energy storage capacitor Download PDFInfo
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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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Abstract
The invention discloses a magnetic reset forward converter capable of inhibiting reverse charging of an LCD energy storage capacitor connected in series on 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 reversely charged, and reduces the reactive 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 is also eliminated.
Description
Technical Field
The invention belongs to the technical field of switching power supplies, and particularly relates to a magnetic reset forward converter capable of inhibiting reverse charging of a secondary side series LCD energy storage capacitor.
Background
In many isolated switching power supply conversion topologies, compared with a flyback converter, the power of a forward converter is not limited by the energy storage capacity of a transformer; compared with half-bridge converters and full-bridge converters, forward converters have fewer used components, simpler circuits, lower cost and higher reliability. Therefore, the forward converter circuit is more suitable for being applied to medium and small power electric energy conversion occasions due to the advantages of relatively simple structure, low cost, input and output isolation, high working reliability and the like, and is highly concerned by the industry.
However, in the case of the single-tube forward converter, because the high-frequency transformer core is magnetized unidirectionally when the single-tube forward converter operates in a forward excitation state, the high-frequency transformer core does not have a magnetic reset function, and thus the single-tube forward converter has a high possibility of causing problems such as magnetic core saturation and the like. The current flowing through the switching tube is increased suddenly as a result of magnetic saturation, and even the switching tube is damaged, so that the popularization of the forward converter is limited to a great extent, and a special magnetic reset circuit or an energy transfer circuit must be added to avoid magnetic core saturation.
The main operating mechanism of the magnetic reset circuit is to transfer the excitation energy in the off time of the switch in each period, and the excitation energy can be consumed on other devices or returned to the input power supply or transmitted to the load side. The magnetic reset circuits adopted by the existing forward converter are more in types and roughly divided into three types, wherein one type is that a reset winding is connected to an input end to return energy to an input power supply; the second is that the primary side of the transformer is connected with reset circuits such as RCD, LCD and the like, so that energy is consumed or returned to the input end; and thirdly, resetting measures are taken on the secondary side, so that energy can be transferred to the output end. The traditional RCD clamping circuit is simple, and has the defects that excitation energy is consumed in a clamping resistor, so that the overall efficiency of a system is difficult to improve; the magnetic reset realized by the active clamping technology is a method with excellent performance, but the complexity, the design difficulty and the cost of a converter circuit are increased; 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 the transformer structure and increases the voltage stress of the power switch tube. The existing secondary side resetting method comprises the following steps: or the reset winding or the circuit needs to be added for complexity, so that the design and manufacturing difficulty and cost of the transformer or the circuit are increased; or more diodes are needed for realizing energy transfer, so that the circuit loss is increased; or the operating mode or other electrical performance indexes of the forward inductor can be influenced, which is not beneficial to high-power transmission. Therefore, in order to further popularize and apply the forward converter, solve the problem of magnetic reset, improve the comprehensive performance of the forward converter, and solve the defects of other reset modes, research on a new magnetic reset mode is a problem which needs to be continuously studied.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art, provides a magnetic reset forward converter capable of inhibiting reverse charging of a secondary side series LCD energy storage capacitor, and solves the problems of low excitation energy utilization rate, complex circuit composition, large loss and low efficiency of the existing magnetic reset circuit.
In order to solve the technical problems, the invention adopts the technical scheme that: a magnetic reset forward converter capable of inhibiting reverse charging of an LCD energy storage capacitor connected in series with a secondary side comprises a forward converter main circuit (1) and an energy transfer and transmission circuit (2) connected with the forward converter main circuit (1); the forward converter main circuit (1) comprises a high-frequency transformer T, a switching tube S, a diode D1, a diode D2, an inductor L1 and a capacitor C1, wherein the dotted end of the primary side of the high-frequency transformer T is the positive voltage input end IN + of the forward converter main circuit (1) and is connected with the positive output end of an external power supply, the dotted end of the primary side of the high-frequency transformer T is connected with the drain electrode of the switching tube S, the source electrode of the switching tube S is the negative voltage input end IN-of the forward converter main circuit (1) and is connected with the negative output end of the external power supply, the grid electrode of the switching tube S is connected with the output end of an external controller, the dotted end of the secondary side of the high-frequency transformer T is connected with the anode of the diode D2, the cathode of the diode D2 is connected with the cathode 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 the positive voltage output, the synonym end of the secondary side of the high-frequency transformer T is connected with the anode of the diode D1 and the other end of the capacitor C1 and is the negative voltage output end OUT-of the forward converter main circuit (1), and the negative voltage output end OUT-of the forward converter main circuit (1) is grounded; 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.
Wherein, the preferred scheme is: the diodes D1, D2 are fast recovery diodes.
Wherein, 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 technical scheme that: a magnetic reset forward converter of a magnetic reset forward converter is applied to the magnetic reset forward converter, a capacitor C2 of the magnetic reset forward converter is selected according to a first selection step, and the specific steps comprise:
step 101, selecting a capacitance value C of an excitation energy storage capacitor C22；
Step 102, calculating the voltage withstanding value V of the capacitor C2C2,max；
Step 103, selecting the capacity value C2And the withstand voltage value is larger than VC2,maxAs the capacitance C2.
Wherein, the preferred scheme is: the inductance L2 of the magnetic reset forward converter is selected according to a second selection step; wherein the second selecting step comprises the following steps:
step 201, determining the current of an inductor L2;
step 202, determining the inductance L of the inductor L22The value range of (a);
step 203, selecting the inductor L2 meeting the inductance and overcurrent capacity according to the steps 201 and 202.
Wherein, the preferred scheme is: the diode D3 and the diode D4 of the magnetic reset forward converter are selected according to the third selection step in parameter design and model selection; wherein the third selecting step comprises the following steps:
step 301, calculating the maximum current I flowing through the diode D3D3,max；
Step 302, calculating the voltage withstanding value V of the diode D3D2,max；
Step 303, according to the maximum current I flowing through the diode D3D3,maxAnd a withstand voltage value V of the diode D3D3,maxDiode D3 is selected.
Step 304, calculating the maximum current I flowing through the diode D4D4,max；
Step 305, calculating the voltage withstanding value V of the diode D4D4,max；
Step 306, according to the maximum current I flowing through the diode D4D4,maxAnd a withstand voltage value V of the diode D4D4,maxDiode D4 is selected.
Compared with the prior art, the invention has the following advantages:
1. the magnetic reset forward converter can inhibit the reverse charging of the secondary side series LCD energy storage capacitor, realizes the transfer of excitation energy to the load side, improves the utilization rate of the transformer excitation energy, and improves the overall efficiency of the converter.
2. The storage process and the release process of the excitation energy are both performed by 1 diode, and compared with the conventional secondary side reset forward converter, the loss of the diodes is reduced;
3. the inductor L2 can work in CCM and DCM simultaneously, which is beneficial for the inductor L1 to work in CCM and is suitable for high-power output.
4. A branch circuit formed by the capacitors C2 and L2 can only transmit excitation energy, and the value of L2 can be small, so that the converter is favorable for realizing high power density and reducing the cost of the converter.
5. Diode D4 can restrain capacitor C2 from reverse charging, and reactive power loss of the converter is reduced.
6. Diode D1 has no reverse recovery problem, and reduces surge current and loss caused by reverse recovery process.
7. The magnetic reset forward converter capable of inhibiting reverse charging of the secondary side series LCD energy storage capacitor is high in working stability and reliability, simple in circuit, free of complex control and wide in popularization value.
8. The magnetic reset forward converter capable of inhibiting the reverse charging of the secondary side serial LCD energy storage capacitor is reset relative to the auxiliary winding, so that the design difficulty of the transformer is reduced.
In summary, the circuit of the invention has the advantages of simple structure, convenient implementation, low cost, simple working mode, high working stability and reliability, long service life, low power consumption, high utilization rate of the transformer, high energy transmission efficiency, capability of improving the working safety and reliability of the switching power supply, strong practicability and high popularization and application value.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic circuit diagram of a magnetic reset forward converter capable of suppressing reverse charging of a secondary side series LCD energy storage capacitor according to the present invention.
Description of reference numerals:
1-forward converter main circuit; 2-energy transfer and transmission circuit.
Detailed Description
As shown in fig. 1, the magnetic reset forward converter capable of suppressing reverse charging of the secondary side series LCD energy storage capacitor of the present invention includes a forward converter main circuit 1, and an energy transfer and transmission circuit 2 connected to the forward converter main circuit 1; the forward converter main circuit 1 comprises a high-frequency transformer T, a switching tube S, a diode D1, a diode D2, an inductor L1 and a capacitor C1, wherein the dotted terminal of the primary side of the high-frequency transformer T is the positive voltage input terminal IN + of the forward converter main circuit 1 and is connected with the positive output terminal of an external power supply, the dotted terminal of the primary side of the high-frequency transformer T is connected with the drain electrode of the switching tube S, the source electrode of the switching tube S is the negative voltage input terminal IN-of the forward converter main circuit 1 and is connected with the negative output terminal of the external power supply, the grid electrode of the switching tube S is connected with the output terminal of an external controller, the dotted terminal of the secondary side of the high-frequency transformer T is connected with the anode of the diode D2, the cathode of the diode D2 is connected with the cathode 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 the positive, the synonym end of the secondary side of the high-frequency transformer T is connected with the anode of the diode D1 and the other end of the capacitor C1 and is the negative voltage output end OUT-of the forward converter main circuit 1, and the negative voltage output end OUT-of the forward converter main circuit 1 is grounded; 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 specific implementation, the load RL is connected between the positive voltage output end OUT + and the negative voltage output end OUT-of the forward converter main circuit 1. In the forward converter main circuit 1, an inductor L1 and a capacitor C1 are used for filtering.
In this embodiment, the diodes D1 and D2 are fast recovery diodes. Diode D2 is used for freewheeling.
In this embodiment, the switch tube S is a fully-controlled power semiconductor device.
The working principle of the embodiment is as follows:
before analyzing the operation principle of the present embodiment, it is assumed that the inductors L1, L2, and Lw2 all operate in CCM. The operation principle of the present embodiment is analyzed by dividing the on period and the off period of the switching tube. For the convenience of introducing the principle, the following convention is made: for the capacitor C2, the voltage thereof is assumed to be positive voltage from left to right and negative to left and negative to right; for the secondary winding w2, the current is assumed to be forward current from bottom to top and reverse current from top to bottom.
1. Operating principle of switching tube during S conduction period
Assume that the exciting current Lw2 falls to a minimum value (non-zero) before the switch on time, the forward voltage of C2 is maximum, and L1 and L2 both fall to the minimum value. D3 is turned on, and D1, D2 and D4 are all turned off.
The first stage is as follows: forward energy transfer (C2 transfer energy to L2)
After the switching tube is conducted, an input voltage Vi is applied to two ends of a primary winding of the transformer, the voltage coupled to a secondary winding w2 is positive up and negative down, D2 is conducted, and forward excitation energy supplies energy to a load through an inductor L1. Since D2 is turned on, the series branch of C2 and L2 is short-circuited, and C2 discharges energy to inductor L2 until the forward voltage of C2 drops to zero, which ends. In the process, D4 remains off due to the reverse voltage of C2.
And a second stage: forward energy transfer (L2 current maintenance)
After the forward voltage of the capacitor C2 drops to zero, D4 is naturally turned on (zero voltage and zero current are turned on), D2 is still turned on, L2, C2 and D4 are short-circuited, and the L2 current remains unchanged. The forward energy continues to energize the load through D2, L1, and the L1 current continues to rise until the L1 current reaches a maximum value when the switch is turned off, at which point the phase ends.
2. Energy transmission process and working principle during S turn-off period of switching tube
The first stage is as follows: charging of parasitic capacitance Cc of switch tube
After the driving signal of the switching tube is changed from high level to low level, the switching tube enters a turn-off period. In the process of switching on and switching off the switching tube, the exciting current and the secondary side reflected current charge a parasitic capacitor Cc of the switching tube, the primary side voltage and the secondary side voltage of the transformer are reduced until the secondary side voltage is reduced to zero, and the stage is finished. At this stage, D2 and D4 are kept on, and D1 and D3 are turned off.
And a second stage: only the free flow of L1 provides energy to the load (constant current L2)
After the secondary side voltage is reduced to zero, the diode D3 is conducted, the secondary side winding of the transformer charges the capacitor C2 in the forward direction, the forward voltage of the capacitor C2 gradually increases from zero, and the D4 is turned off. In the process, D1 is conducted, inductor L1 continues to provide energy to the load after passing through D1, and the L1 current drops linearly. Since both D1 and D3 remain on, the inductor L2 current remains unchanged until L1 current drops to L2 current, D1 turns off naturally, and this stage ends. In this stage, when the current of L1 drops to the current of L2, D1 is naturally turned off, and D1 zero-current turn-off is realized.
And a third stage: l1, L2 freewheel simultaneously and provide energy to the load
After the inductor L1 current drops to equal the L2 current, D1 turns off. Thereafter, D3 remains on, and inductors L1, L2 freewheel through D3 simultaneously and provide energy to the load. When the switching tube S is conducted, the currents of the L1 and the L2 are reduced to the minimum value, the voltage at two ends of the C2 reaches the maximum value, the current of the secondary winding Lw2 is reduced to the minimum value, and the process is finished.
In this embodiment, the capacitor C2 is selected according to a first selection step; wherein the step of the first selecting step comprises:
step 101, according to a formula
Selecting the capacitance value C of an excitation energy storage capacitor C22
102, calculating the withstand voltage value V of the capacitor C2 according to the formula (A1)C2,max；
Wherein,
d is the duty ratio of the switch tube S, n is the turn ratio of the primary winding and the secondary winding of the high-frequency transformer T, and LmIs 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, ViInputting voltage for a main circuit 1 of the forward converter;
step 103, selecting the capacity value C2And the withstand voltage value is larger than VC2,maxAs the capacitance C2.
In this embodiment, the inductance L2 is selected; wherein the second selecting step comprises the following steps:
step 201, determining the current of the inductor L2 according to the formula (A2)
Step 202, determining the inductance L of the inductor L2 according to the formula (A3)2The value range of (a);
wherein, IL2Is the current through inductor L2, VoIs the output voltage of the main circuit 1 of the forward converter;
step 203, selecting the inductor L2 meeting the inductance and overcurrent capacity according to the steps 201 and 202.
In the embodiment, the diodes D1-D4 are designed according to parameters and model selection; wherein the third selecting step comprises the following steps:
step 301, calculating the maximum current I flowing through the diode D3 according to the formula (A10)D3,max；
Step 302, calculating the voltage withstanding value V of the diode D3 according to the formula (A11)D2,max；
Wherein, IL1,maxIs the maximum current flowing through the primary winding of the high frequency transformer T;
step 303, according to the maximum current I flowing through the diode D3D3,maxAnd a withstand voltage value V of the diode D3D3,maxDiode 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 value V of the diode D4 according to the formula (A13)D4,max；
Step 306, according to the maximum current I flowing through the diode D4D4,maxAnd a withstand voltage value V of the diode D4D4,maxDiode D4 is selected.
Of course, the above description is only for illustrating the feasibility of the technical solution of the present invention, and the principle of one of the operation modes and the corresponding formula are listed, but not the only and limited description, which is used as reference.
It should be particularly noted that the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and it is obvious for those skilled in the art to modify the technical solutions described in the above-mentioned embodiments or to substitute part of the technical features thereof; and all such modifications and alterations are intended to fall within the scope of the appended claims.
Claims (6)
1. A can restrain vice limit series connection LCD energy storage capacitor reverse charge's magnetism and reset forward converter which characterized in that: the energy transfer and transmission circuit comprises a forward converter main circuit (1) and an energy transfer and transmission circuit (2) connected with the forward converter main circuit (1); the forward converter main circuit (1) comprises a high-frequency transformer T, a switching tube S, a diode D1, a diode D2, an inductor L1 and a capacitor C1, wherein the dotted end of the primary side of the high-frequency transformer T is the positive voltage input end IN + of the forward converter main circuit (1) and is connected with the positive output end of an external power supply, the dotted end of the primary side of the high-frequency transformer T is connected with the drain electrode of the switching tube S, the source electrode of the switching tube S is the negative voltage input end IN-of the forward converter main circuit (1) and is connected with the negative output end of the external power supply, the grid electrode of the switching tube S is connected with the output end of an external controller, the dotted end of the secondary side of the high-frequency transformer T is connected with the anode of the diode D2, the cathode of the diode D2 is connected with the cathode 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 the positive voltage output, the synonym end of the secondary side of the high-frequency transformer T is connected with the anode of the diode D1 and the other end of the capacitor C1 and is the negative voltage output end OUT-of the forward converter main circuit (1), and the negative voltage output end OUT-of the forward converter main circuit (1) is grounded; 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.
2. The magnetic reset forward converter capable of suppressing reverse charging of the secondary side series connection LCD energy storage capacitor as claimed in claim 1, wherein: the diodes D1, D2 are fast recovery diodes.
3. The magnetic reset forward converter capable of suppressing reverse charging of the secondary side series connection LCD energy storage capacitor as claimed in claim 1, wherein: the switch tube S is a full-control power semiconductor device.
4. The magnetic reset forward converter capable of suppressing reverse charging of the secondary side series connection LCD energy storage capacitor as claimed in claim 1, wherein: the capacitor C2 of the magnetic reset forward converter capable of inhibiting reverse charging of the secondary side series LCD energy storage capacitor is selected according to a first selection step, and the specific steps comprise:
step 101, selecting a capacitance value C of an excitation energy storage capacitor C22；
Step 102, calculating the voltage withstanding value V of the capacitor C2C2,max；
Step 103, selecting the capacity value C2And the withstand voltage value is larger than VC2,maxAs the capacitance C2.
5. The magnetic reset forward converter capable of suppressing reverse charging of the secondary side series connection LCD energy storage capacitor as claimed in claim 4, wherein: the inductor L2 of the magnetic reset forward converter capable of inhibiting the reverse charging of the secondary side series LCD energy storage capacitor is selected according to a second selection step; wherein the second selecting step comprises the following steps:
step 201, determining the current of an inductor L2;
step 202, determining the inductance L of the inductor L22The value range of (a);
step 203, selecting the inductor L2 meeting the inductance and overcurrent capacity according to the steps 201 and 202.
6. The magnetic reset forward converter capable of suppressing reverse charging of the secondary side series LCD energy storage capacitor according to claim 4 or 5, characterized in that: the diode D3 and the diode D4 of the magnetic reset forward converter capable of inhibiting the reverse charging of the secondary side series LCD energy storage capacitor are selected according to a third selection step in parameter design and model selection; wherein the third selecting step comprises the following steps:
step 301, calculating the maximum current I flowing through the diode D3D3,max；
Step 302, calculating the voltage withstanding value V of the diode D3D2,max；
Step 303, according to the maximum current I flowing through the diode D3D3,maxAnd a withstand voltage value V of the diode D3D3,maxDiode D3 is selected.
Step 304, calculating the maximum current I flowing through the diode D4D4,max；
Step 305, calculating the voltage withstanding value V of the diode D4D4,max；
Step 306, according to the maximum current I flowing through the diode D4D4,maxAnd a withstand voltage value V of the diode D4D4,maxDiode D4 is selected.
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