CN214674901U - Bidirectional double-transformer resonant converter - Google Patents
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- CN214674901U CN214674901U CN202121004817.8U CN202121004817U CN214674901U CN 214674901 U CN214674901 U CN 214674901U CN 202121004817 U CN202121004817 U CN 202121004817U CN 214674901 U CN214674901 U CN 214674901U
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Abstract
The utility model discloses a two-way double-transformer resonant converter, include: the device comprises an input energy storage capacitor, a primary side inverter circuit, a resonant capacitor, a first high-frequency transformer, a second high-frequency transformer, a secondary side inverter circuit and an output energy storage capacitor. According to the bidirectional double-transformer resonant converter, the first high-frequency transformer and the second high-frequency transformer participate in resonance, the clamping effect of the output voltage after the secondary rectifier tube is switched on is ingeniously utilized, the role conversion of energy transfer of the transformers and energy storage of the resonant inductors is realized, the first high-frequency transformer and the second high-frequency transformer can be used as the resonant inductors and can also be used as the excitation inductors and the transformers, and the bidirectional flow of energy is realized through the energy transfer between the two transformers. Compared with the traditional LLC resonant converter, the resonant converter has the advantages of more balanced heat dissipation, wider voltage conversion gain and bidirectional energy flow.
Description
Technical Field
The utility model relates to an electronic components technical field especially relates to a two-way double-transformer resonant converter.
Background
The LLC resonant converter is one kind of soft switch, and it can realize zero voltage switching on of the primary side switch tube and zero current switching off of the secondary side diode with less components, so as to realize lower switching loss. As shown in fig. 1, the LLC resonant converter includes an inverter circuit, a resonant circuit, a high-frequency transformer, and an output rectification circuit; the inverter circuit can be a two-level or three-level asymmetric half-bridge circuit and a full-bridge circuit; the resonance circuit is formed by connecting a resonance capacitor, a resonance inductor and a primary side inductor of the high-frequency transformer in series. When the inverter circuit works, the inverter circuit outputs a complementary level with a fixed 50% duty ratio to the resonant network, and the switching device of the inverter circuit realizes zero voltage switching-on and zero current switching-off of the secondary rectifier tube through the resonant work of the resonant inductor, the resonant capacitor and the excitation inductor.
The LLC resonant converter can work near the resonant frequency under the rated working condition, the resonant converter has the highest efficiency, but when the input or output voltage changes, frequency modulation is needed to adapt to the voltage change, along with the deviation of the frequency, the circuit loss is increased, the system efficiency is reduced, the resonant inductor and the transformer have difficulty in heat dissipation due to the increase of copper loss and magnetic loss, particularly, when the LLC converter outputs at high-voltage light load and low-voltage heavy load, the resonant inductor and the transformer are easy to generate the condition of thermal imbalance, and the problem of heat dissipation can be solved only by increasing the window area of a magnetic core and increasing the wire diameter, namely, the power density of the converter is sacrificed; the LLC resonant circuit can realize soft switching in a wide variation range of output voltage, if the variation range of the output voltage reaches more than 2 times, the LLC gain can be adjusted by reducing the inductance of the excitation inductor theoretically, so that the working range of the LLC resonant circuit is enlarged, but the reactive component of primary side current is greatly increased along with the reduction of the excitation inductor, so that the loss and the volume of a magnetic core element are increased. Especially, when the high-power converter may work in a wider output voltage range, the inadaptability is more prominent, so that the existing resonant circuit topology needs to be improved to solve the problems of the existing resonant circuit in the application occasions of high power and wide output range.
SUMMERY OF THE UTILITY MODEL
Therefore, the bidirectional double-transformer resonant converter is needed to solve the technical problems that the traditional LLC resonant inductor and the transformer are unbalanced in heat, the LLC output gain is improved, and the design difficulty is reduced.
A bidirectional two-transformer resonant converter comprising: the device comprises an input energy storage capacitor, a primary side inverter circuit, a resonant capacitor, a first high-frequency transformer, a second high-frequency transformer, a secondary side inverter circuit and an output energy storage capacitor;
the anode of the input energy storage capacitor is connected with the first input end of the primary side inverter circuit, the cathode of the input energy storage capacitor is connected with the second output end of the primary side inverter circuit,
one end of the resonance capacitor is connected with the first output end of the primary side inverter circuit, the other end of the resonance capacitor is connected with the homonymous end of the primary side winding of the first high-frequency transformer,
the synonym end of the primary winding of the first high-frequency transformer is connected with the synonym end of the primary winding of the second high-frequency transformer, the synonym end of the primary winding of the second high-frequency transformer is connected with the second output end of the primary inverter circuit,
the different name end of the secondary winding of the first high-frequency transformer and the same name end of the secondary winding of the second high-frequency transformer are respectively connected with the negative electrode of the output energy-storage capacitor,
the homonymous end of the secondary winding of the first high-frequency transformer is connected with the first input end of the secondary inverter circuit, the heteronymous end of the secondary winding of the second high-frequency transformer is connected with the second input end of the secondary inverter circuit, and the first output end of the secondary inverter circuit and the second output end of the secondary inverter circuit are respectively connected with the anode of the output energy storage capacitor.
In one embodiment, the primary inverter circuit is a half-bridge circuit, and the secondary inverter circuit is a half-bridge circuit.
In one embodiment, the primary side inverter circuit comprises a rectifier tube Q1 and a rectifier tube Q2, the secondary side inverter circuit comprises a rectifier tube Q3 and a rectifier tube Q4, the drain of the rectifier tube Q1 is connected with the anode of the input energy storage capacitor, the source of the rectifier tube Q1 is connected with one end of the resonant capacitor, the drain of the rectifier tube Q2 is connected with the source of the rectifier tube Q1, and the source of the rectifier tube Q1 is connected with the cathode of the input energy storage capacitor;
the drain electrode of rectifier Q3 with the positive pole of output energy storage capacitor is connected, the source electrode of rectifier Q3 with the dotted terminal of first high frequency transformer secondary winding is connected, the drain electrode of rectifier Q4 with the positive pole of output energy storage capacitor is connected, the source electrode of rectifier Q4 with the unlike terminal of second high frequency transformer secondary winding is connected.
In one embodiment, the rectifier Q1, the rectifier Q2, the rectifier Q3 and the rectifier Q4 are mosfets.
In one embodiment, the resonant capacitor, the primary side excitation inductor of the first high-frequency transformer, and the primary side excitation inductor of the second high-frequency transformer are connected in series.
In one embodiment, the first high-frequency transformer and the second high-frequency transformer are two transformers composed of the same components and materials.
In one embodiment, the primary side of the first high frequency transformer and the second high frequency transformer each have only one winding.
According to the bidirectional double-transformer resonant converter, the first high-frequency transformer and the second high-frequency transformer participate in resonance, the clamping effect of the output voltage after the secondary rectifier tube is switched on is ingeniously utilized, the role conversion of energy transfer of the transformers and energy storage of the resonant inductors is realized, the first high-frequency transformer and the second high-frequency transformer can be used as the resonant inductors and can also be used as the excitation inductors and the transformers, and the bidirectional flow of energy is realized through the energy transfer between the two transformers. Compared with the traditional LLC resonant converter, the resonant converter has the advantages of more balanced heat dissipation, wider voltage conversion gain and bidirectional energy flow.
Drawings
Fig. 1 is a schematic diagram of a circuit structure of an LLC resonant converter in the prior art;
FIG. 2 is a schematic diagram of a circuit configuration of a bidirectional dual-transformer resonant converter in one embodiment;
FIG. 3 is an equivalent circuit diagram of the embodiment shown in FIG. 2 in a first mode;
FIG. 4 is an equivalent circuit diagram of the embodiment shown in FIG. 2 in a second mode;
FIG. 5 is an equivalent circuit diagram of the embodiment shown in FIG. 2 in a third mode;
FIG. 6 is an equivalent circuit diagram of the embodiment shown in FIG. 2 in a fourth mode;
FIG. 7 is an equivalent circuit diagram of the embodiment shown in FIG. 2 in a fifth mode;
FIG. 8 is an equivalent circuit diagram in a sixth mode of the embodiment shown in FIG. 2;
fig. 9 is a corresponding waveform diagram of the operation of each of the embodiments of fig. 3 to 8.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
It should be noted that the bidirectional converter is a device for realizing bidirectional energy flow and conversion of different voltages and currents; the resonant converter is a resonant network composed of a resonant inductor, a resonant capacitor and a transformer excitation inductor, energy transfer is realized through resonance, soft switching of a switching tube can be realized at low cost by controlling the magnitude of resonant energy, and the resonant converter is widely applied to the current DC/DC converter with high power, high power density and high efficiency.
Referring to fig. 2, the utility model provides a two-way double-transformer resonant converter has solved the unbalanced problem of traditional LLC resonant inductor and transformer heat, has widened the gain range of LLC to under the prerequisite that does not additionally increase power device, act as resonant inductor transmission energy in turn between two transformers and realize the two-way transmission of energy. Specifically, the bidirectional double-transformer resonant converter includes: the device comprises an input energy storage capacitor Vin, a primary side inverter circuit, a resonant capacitor C1, a first high-frequency transformer T1, a second high-frequency transformer T2, a secondary side inverter circuit and an output energy storage capacitor Vo. The positive pole of the input energy storage capacitor Vin is connected with the first input end of the primary side inverter circuit, and the negative pole of the input energy storage capacitor Vin is connected with the second output end of the primary side inverter circuit. One end of the resonant capacitor C1 is connected with the first output end of the primary side inverter circuit, and the other end of the resonant capacitor C1 is connected with the dotted end of the primary side winding of the first high-frequency transformer T1. The synonym end of the primary winding of the first high-frequency transformer T1 is connected with the synonym end of the primary winding of the second high-frequency transformer T2, and the synonym end of the primary winding of the second high-frequency transformer T2 is connected with the second output end of the primary inverter circuit. The different name end of the secondary winding of the first high-frequency transformer T1 and the same name end of the secondary winding of the second high-frequency transformer T2 are respectively connected with the negative electrode of the output energy storage capacitor Vo. The homonymous terminal of the secondary winding of the first high-frequency transformer T1 is connected with the first input terminal of the secondary inverter circuit, the heteronymous terminal of the secondary winding of the second high-frequency transformer T2 is connected with the second input terminal of the secondary inverter circuit, and the first output terminal of the secondary inverter circuit and the second output terminal of the secondary inverter circuit are respectively connected with the anode of the output energy-storage capacitor Vo.
According to the bidirectional double-transformer resonant converter, the first high-frequency transformer T1 and the second high-frequency transformer T2 participate in resonance, the role conversion of energy transfer of the transformers and energy storage of resonant inductors is realized by skillfully utilizing the clamping effect of output voltage after the secondary rectifier tube is switched on, the first high-frequency transformer T2 and the second high-frequency transformer T2 can be used as resonant inductors and excitation inductors and transformers, and energy can flow bidirectionally through energy transfer between the two transformers. Compared with the traditional LLC resonant converter, the resonant converter has the advantages of more balanced heat dissipation, wider voltage conversion gain and bidirectional energy flow.
In one embodiment, the primary inverter circuit is a half-bridge circuit, and the secondary inverter circuit is a half-bridge circuit. In other embodiments, the primary side inverter circuit may be a half-bridge circuit, a full-bridge circuit, other two-level circuit, or a multi-level circuit. The secondary inverter circuit can be a half-bridge circuit, a full-bridge circuit, other two-level circuits or a multi-level circuit.
In one embodiment, the primary side inverter circuit comprises a rectifier tube Q1 and a rectifier tube Q2, the secondary side inverter circuit comprises a rectifier tube Q3 and a rectifier tube Q4, the drain electrode of the rectifier tube Q1 is connected with the anode of the input energy storage capacitor Vin, the source electrode of the rectifier tube Q1 is connected with one end of a resonant capacitor C1, the drain electrode of the rectifier tube Q2 is connected with the source electrode of the rectifier tube Q1, and the source electrode of the rectifier tube Q1 is connected with the cathode of the input energy storage capacitor Vin; the drain of the rectifier Q3 is connected to the positive terminal of the output energy storage capacitor Vo, the source of the rectifier Q3 is connected to the dotted terminal of the secondary winding of the first high-frequency transformer T1, the drain of the rectifier Q4 is connected to the positive terminal of the output energy storage capacitor Vo, and the source of the rectifier Q4 is connected to the dotted terminal of the secondary winding of the second high-frequency transformer T2.
In one embodiment, each of the rectifier transistors Q1, Q2, Q3 and Q4 is a Mosfet (Metal-Oxide-Semiconductor Field-Effect Transistor), i.e., a Mosfet.
In one embodiment, the resonant capacitor C1, the primary side exciting inductance of the first high frequency transformer T1 and the primary side exciting inductance of the second high frequency transformer T2 are connected in series.
In one embodiment, the first high frequency transformer T1 and the second high frequency transformer T2 are two transformers made of the same components and materials.
In one embodiment, the primary side of the first high frequency transformer T1 and the second high frequency transformer T2 each have only one winding.
In order to further explain the working principle of the bidirectional double-transformer resonant converter, the working principle of the bidirectional double-transformer resonant converter is explained by using a half bridge as a primary side inverter circuit and a half bridge as a secondary side inverter circuit, wherein Q1, Q2, Q3 and Q4 are mosfets, and driving signals of the mosfets are complementary signals with a fixed 50% duty ratio. The following description will discuss the operation principle of the circuit of the present invention, taking the energy from left to right as an example, and the operation principle of the right-to-left conversion is similar.
The LLC resonant frequency is defined as fr:
the intrinsic resonance frequency of LLC is defined as fm:
the resonant converter can be operated not only in the frequency range of f > fr but also in the frequency range of fm < f < fr, and the operation principle of the two-transformer resonant converter is explained below in terms of fm < f < fr.
In the following analysis, the output capacitance is considered infinite and the output energy storage capacitance Vo is substituted for what is also referred to as the constant voltage source Vo. In the frequency range fm < f < fs, one switching cycle of the converter can be divided into 6 operating modes, as shown in the 6 equivalent circuits of fig. 3 to 8, respectively. The corresponding operating waveform is shown in fig. 9. The working principles of the 6 working modes are respectively described as follows:
(1) in the first mode: t0<t<t 1. At time point Q2, when t is t0, the resonant current i is turned offrThe output capacitor of the main switch Q1 is discharged, the drain-source voltage Vds1 of Q1 begins to drop, and when Vds1 drops to zero, the body diode of Q1 conducts. An input voltage is applied to the resonant tank. On the secondary side of the transformer, the polarity of the transformer winding is positive, negative, and upper, the rectifier diode Q3 is turned on, the voltage of the excitation inductor Lm2 of the second high-frequency transformer is clamped by the output voltage, resonance occurs substantially between the excitation inductors Lm1 and Cr of the first high-frequency transformer, and the current i of the excitation inductor Lm2 of the second high-frequency transformermAnd (4) increasing linearly.
(2) In the second mode: t1<1<t 2. The zero voltage condition of Q1 turns on at time t 1. Excitation current imContinues to rise linearly, the resonant current irFlows through Q1 and rises gradually in a sinusoidal fashion. The output current is the difference between the resonant current and the excitation current. In the working frequency range, the switching period is larger than the resonance period of Lm and Cr. Thus, Q1 is still in the on state when the resonant current is resonant through one half cycle. When the resonant current irDown to the excitation current imThe time rectifier diode Q4 current crosses zero and turns off. The operating mode ends.
(3) In the third mode: t2< t < t 3. At time t2 rectifier diode Q4 is off at zero current condition. The output side is completely decoupled from the resonant tank. The voltage of the two transformer excitation inductors is not limited and clamped by the output voltage any more, the second high-frequency transformer excitation inductor Lm2 and the first high-frequency transformer excitation inductor Lm1 are connected in series to participate in resonance, and the resonance period is obviously prolonged. The resonant current remains substantially unchanged, so it can be considered that:
the operation modes 4, 5, 6 are similar to the operation modes 1, 2, 3. Except that in stages 4, 5 and 6, resonance occurs between the magnetizing inductance Lm2 and the resonance capacitor of the second high-frequency transformer, while the first high-frequency transformer transfers energy for the secondary side. In these phases the initial energy of resonance is provided by the resonance capacitor Cr. The operating waveform is completely symmetrical with modes 1, 2, 3.
(4) A fourth mode: t3<t<t 4. At time point Q1, when t is t3, the resonant current i is turned offrThe output capacitor of the main switch Q2 is discharged, the drain-source voltage Vds2 of Q2 begins to drop, and when Vds2 drops to zero, the body diode of Q2 conducts. On the secondary side of the transformer, the polarity of the transformer winding is negative up and positive down, the rectifier diode Q4 is turned on, the voltage of the first high-frequency transformer magnetizing inductor Lm1 is clamped by the output voltage, resonance actually occurs between the second high-frequency transformer magnetizing inductor Lm2 and Cr, and the current i of the first high-frequency transformer magnetizing inductor Lm1mThe linearity decreases.
(5) A fifth mode: t4<1<t 5. The zero voltage condition of Q2 turns on at time t 4. Excitation current imContinuing to linearly decrease, resonant current irFlows through Q2 and increases in a sinusoidal fashion negatively. The output current is the difference between the resonant current and the excitation current. In the working frequency range, the switching period is larger than the resonance period of Lm and Cr. Thus, Q2 is still in the on state when the resonant current is resonant through one half cycle. But the resonant current irDown to the excitation current imThe rectifier diode Q3 turns off when the current crosses zero and the operating mode ends.
(6) A sixth mode: t5< t < t 6. At time t5 rectifier diode Q3 is off at zero current condition. The output side is completely decoupled from the resonant tank. The voltage of the first high-frequency transformer exciting inductor is not clamped by the output voltage any more, and the first high-frequency transformer exciting inductor Lm1 and the second high-frequency transformer exciting inductor Lm2 are connected in series to participate in resonance. The resonant current remains substantially unchanged, the discharge of the resonant capacitor Cr continues, the voltage of Cr continues to drop, and until time t6, Q2 turns off and a new duty cycle begins.
The utility model discloses in, two transformers participate in the resonance, and the ingenious clamping effect that utilizes secondary rectifier tube to open back output voltage realizes transformer transmission energy and resonance inductance and stores the role conversion of energy, and first, second high frequency transformer can regard as resonance inductance, also can regard as excitation inductance and transformer to use, and realizes the two-way flow of energy through the energy transfer between two transformers. Compared with the traditional LLC resonant converter, the resonant converter has the advantages of more balanced heat dissipation, wider voltage conversion gain and bidirectional energy flow. For the traditional LLC resonant circuit, the resonant circuit is difficult to adapt to the application occasions of high power, wide working range and high power density. The resonant inductor and the high-frequency transformer are core components of the LLC resonant circuit, and the performance of the resonant inductor and the high-frequency transformer is related to the problems of the efficiency, the heating and the like of the transformer. The resonant inductor and the high-frequency transformer are the main heat sources, the volume and the weight of the LLC resonant circuit, if the power of the resonant circuit is increased, the resonant inductor and the high-frequency transformer are realized by increasing the magnetic core and increasing the area of a winding window, but due to the limitation of the size of the power source, the volume of the magnetic element cannot be too large, so that the design of the magnetic element is limited to a great extent; on the premise of ensuring that the height of the product is not changed, the mode of series connection of the resonant inductors and series-parallel connection of the transformers can be adopted, but the mode also correspondingly increases the area of the PCB and increases the difficulty of board distribution. For variators intended to operate over a wide output range, conventional LLC resonant circuits can be implemented by reducing the magnetizing inductance, but the design difficulty of the magnetics is also increased due to the increase of the reactive component and the increase of the circulating current caused by the reduction of the magnetizing inductance.
The utility model has the advantages that:
1. the utility model discloses in, because the ingenious transmission that has realized resonance inductance's role and energy simultaneously of utilizing double-transformer, half cycle participates in the resonance as resonance inductance promptly, realizes soft switch, and half cycle is as the transformer to energy transmission to the secondary side, and two high frequency transformers are the same under any operating condition like this the consumption, and the heat of production is also the same, makes things convenient for thermal design.
2. Due to the existence of the double transformers, the design of the resonant inductor is omitted, and the design flow of the magnetic element is simplified. Because two transformers share one device, the material cost can be saved during the production.
3. The utility model discloses in, the transformer exists simultaneously as resonance inductance and excitation inductance, therefore resonance inductance and excitation inductance transformation ratio are 1, have improved resonant network's gain greatly. In high-power converter, use this utility model's double-transformer resonant circuit, its output voltage's working range can reach 2.5 times to performance such as output ripple, output precision accord with the trade requirement.
4. The double transformers participate in resonance, one transformer stores energy, the other transformer transmits the energy to the secondary side, the roles of the transformers are alternately switched, and bidirectional flow of the energy can be realized under the condition that a main circuit is not additionally added, so that the bidirectional resonant converter is a bidirectional resonant converter.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (7)
1. A bidirectional dual-transformer resonant converter, comprising: the device comprises an input energy storage capacitor, a primary side inverter circuit, a resonant capacitor, a first high-frequency transformer, a second high-frequency transformer, a secondary side inverter circuit and an output energy storage capacitor;
the anode of the input energy storage capacitor is connected with the first input end of the primary side inverter circuit, the cathode of the input energy storage capacitor is connected with the second output end of the primary side inverter circuit,
one end of the resonance capacitor is connected with the first output end of the primary side inverter circuit, the other end of the resonance capacitor is connected with the homonymous end of the primary side winding of the first high-frequency transformer,
the synonym end of the primary winding of the first high-frequency transformer is connected with the synonym end of the primary winding of the second high-frequency transformer, the synonym end of the primary winding of the second high-frequency transformer is connected with the second output end of the primary inverter circuit,
the different name end of the secondary winding of the first high-frequency transformer and the same name end of the secondary winding of the second high-frequency transformer are respectively connected with the negative electrode of the output energy-storage capacitor,
the homonymous end of the secondary winding of the first high-frequency transformer is connected with the first input end of the secondary inverter circuit, the heteronymous end of the secondary winding of the second high-frequency transformer is connected with the second input end of the secondary inverter circuit, and the first output end of the secondary inverter circuit and the second output end of the secondary inverter circuit are respectively connected with the anode of the output energy storage capacitor.
2. The bidirectional double-transformer resonant converter of claim 1, wherein the primary inverter circuit is a half-bridge circuit and the secondary inverter circuit is a half-bridge circuit.
3. The bidirectional double-transformer resonant converter of claim 2, wherein the primary inverter circuit comprises a rectifier Q1 and a rectifier Q2, the secondary inverter circuit comprises a rectifier Q3 and a rectifier Q4, a drain of the rectifier Q1 is connected to a positive electrode of the input energy storage capacitor, a source of the rectifier Q1 is connected to one end of the resonant capacitor, a drain of the rectifier Q2 is connected to a source of the rectifier Q1, and a source of the rectifier Q1 is connected to a negative electrode of the input energy storage capacitor;
the drain electrode of rectifier Q3 with the positive pole of output energy storage capacitor is connected, the source electrode of rectifier Q3 with the dotted terminal of first high frequency transformer secondary winding is connected, the drain electrode of rectifier Q4 with the positive pole of output energy storage capacitor is connected, the source electrode of rectifier Q4 with the unlike terminal of second high frequency transformer secondary winding is connected.
4. The bi-directional dual-transformer resonant converter of claim 3, wherein the rectifier Q1, the rectifier Q2, the rectifier Q3, and the rectifier Q4 are MOSFETs.
5. The bidirectional double-transformer resonant converter of claim 1, wherein the resonant capacitor, the primary side excitation inductor of the first high-frequency transformer, and the primary side excitation inductor of the second high-frequency transformer are connected in series.
6. The bidirectional double transformer resonant converter of claim 1, wherein the first high frequency transformer and the second high frequency transformer are two transformers composed of the same components and materials.
7. A bidirectional double transformer resonant converter as recited in claim 6 wherein the primary of the first high frequency transformer and the second high frequency transformer each have only one winding.
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