Voltage-sharing resonance circuit
By introducing the center tap of the secondary winding in the transformer module, the voltage equalization problem of the full-bridge LLC resonant circuit under unbalanced load is solved, and the normal operation of the circuit is achieved, and the cost is reduced due to the simple design without adding additional devices.
Patent Information
- Application Number
- CN202421267861.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-06-04
AI Technical Summary
The existing full-bridge LLC resonant circuit cannot achieve voltage equalization when facing unbalanced loads, resulting in the circuit not working properly.
By introducing the central tap of the secondary winding into the transformer module and connecting it to the equalization end of the secondary edge output unit, the voltage equalization of the series load is achieved. The design is exquisite and the structure is simple, without the need for additional devices.
It realizes the voltage equalization effect under unbalanced load conditions, the circuit design is simple and the cost is low, and it is suitable for various resonant circuit scenarios.
Smart Images
Figure CN222234697U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of LLC resonance circuits, and more specifically to a voltage-sharing resonance circuit. Background Art
[0002] LLC resonant circuits are widely used due to their excellent soft switching characteristics. With the widespread application of SICMOSFET, LLC resonant circuits generally use full-bridge rectifier circuits. However, as the input and output voltages become higher and higher, the voltage balancing problem caused by unbalanced loads requires new solutions. Traditional full-bridge LLC resonant circuits such as Figure 1 As shown, when the output is a series load R1, R2 and the resistance values are inconsistent (such as UPS output, energy storage off-grid inverter connected to an unbalanced load), the voltage on the load R1, R2 will be uneven, making the circuit unable to work normally. Utility Model Content
[0003] The technical problem to be solved by the present invention is to provide a voltage equalizing resonant circuit in view of the above-mentioned defects of the prior art, which can not only realize the voltage equalization of series loads, but also has exquisite design, simple structure, wide application range, and low cost because no additional devices are required.
[0004] The technical solution adopted by the utility model to solve its technical problems is: constructing a voltage-equalizing resonant circuit, including a transformer module and a primary input module arranged on the primary side of the transformer module, the transformer module including a primary winding, a first secondary winding and a second secondary winding; the voltage-equalizing resonant circuit further includes a first secondary rectifier unit, a second secondary rectifier unit and a secondary output unit; the primary input module is connected to the primary winding; the same-name end of the first secondary winding is connected to the first secondary rectifier unit, and the opposite-name end is connected to the voltage-equalizing end of the secondary output unit, the same-name end of the second secondary winding is connected to the voltage-equalizing end of the secondary output unit, and the opposite-name end is connected to the second secondary rectifier unit; the first secondary rectifier unit and the second secondary rectifier unit are respectively connected in parallel to the two ends of the secondary output unit; the first secondary winding and the second secondary winding are the same winding; the secondary output unit includes a first load and a second load connected in series with each other.
[0005] In the voltage-equalizing resonant circuit described in the present utility model, the secondary output unit further includes a first output capacitor and a second output capacitor; the first output capacitor and the second output capacitor are connected in series at both ends of the secondary output unit, and the first load and the second load are also connected in series at both ends of the secondary output unit; the connection point of the first output capacitor and the second output capacitor and the connection point of the first load and the second load are connected to each other as the voltage-equalizing end of the secondary output unit.
[0006] In the voltage-sharing resonant circuit described in the present invention, each of the secondary-side rectifying units includes two rectifying devices connected in series, the rectifying devices include diodes, MOSFETs, or IGBTs, and the first load and the second load are different loads.
[0007] In the voltage-equalizing resonant circuit described in the utility model, the primary input module includes an input capacitor, a switch tube full-bridge unit, a resonant capacitor and a resonant inductor; the first input end of the switch tube full-bridge unit is connected to the first end of the input capacitor, the second input end is connected to the second end of the input capacitor, the first output end is connected to the same-name end of the primary winding via the resonant inductor and the resonant capacitor, and the second output end is connected to the opposite-name end of the primary winding.
[0008] In the voltage-equalizing resonant circuit described in the utility model, the primary input module includes a first input capacitor, a second input capacitor, a switch tube half-bridge unit and a resonant inductor; the first input end of the switch tube half-bridge unit is connected to the first end of the first input capacitor, the second input end is connected to the second end of the second input capacitor, and the output end is connected to the same-name end of the primary winding via the resonant inductor, and the second end of the first input capacitor is connected to the first end of the second input capacitor and the opposite-name end of the primary winding.
[0009] In the voltage-equalizing resonant circuit described in the utility model, the primary input module includes an input capacitor, a switch tube half-bridge unit, a resonant capacitor and a resonant inductor; the first input end of the switch tube half-bridge unit is connected to the first end of the input capacitor, the second input end is connected to the second end of the input capacitor and the opposite end of the primary winding, and the output end is connected to the same end of the primary winding via the resonant inductor and the resonant capacitor.
[0010] Another technical solution adopted by the utility model to solve its technical problem is to construct a voltage-equalizing resonant circuit, including a transformer module and a primary input module arranged on the primary side of the transformer module, wherein the transformer module includes a first primary winding, a second primary winding, a third primary winding, a first secondary winding, a second secondary winding, a third secondary winding, a fourth secondary winding, a fifth secondary winding, and a sixth secondary winding;
[0011] The voltage-equalizing resonant circuit further includes a first secondary rectifier unit, a second secondary rectifier unit, a third secondary rectifier unit, a fourth secondary rectifier unit, a fifth secondary rectifier unit, a sixth secondary rectifier unit and a secondary output unit; the same-name end of the first secondary winding is connected to the first secondary rectifier unit, the opposite-name end is connected to the same-name end of the second secondary winding and the voltage-equalizing end of the secondary output unit, and the opposite-name end of the second secondary winding is connected to the second secondary rectifier unit; the same-name end of the third secondary winding is connected to the third secondary rectifier unit, the opposite-name end is connected to the same-name end of the fourth secondary winding and the voltage-equalizing end of the secondary output unit, and the opposite-name end of the fourth secondary winding is connected to the fourth secondary rectifier unit; the same-name end of the fifth secondary winding is connected to the fifth secondary rectifier unit, the opposite-name end is connected to the same-name end of the sixth secondary winding and the voltage-equalizing end of the secondary output unit, and the opposite-name end of the sixth secondary winding is connected to the sixth secondary rectifier unit;
[0012] The same-named ends of the first primary winding, the second primary winding and the third primary winding are respectively connected to the primary input module, and the opposite-named ends are connected to each other;
[0013] The first secondary rectifier unit, the second secondary rectifier unit, the third secondary rectifier unit, the fourth secondary rectifier unit, the fifth secondary rectifier unit and the sixth secondary rectifier unit are respectively connected in parallel at two ends of the secondary output unit;
[0014] The first secondary winding, the second secondary winding, the third secondary winding, the fourth secondary winding and the fifth secondary winding are the same winding;
[0015] The secondary side output unit includes a first load and a second load connected in series with each other.
[0016] In the voltage-equalizing resonant circuit described in the present utility model, the secondary output unit further includes a first output capacitor and a second output capacitor; the first output capacitor and the second output capacitor are connected in series at both ends of the secondary output unit, and the first load and the second load are also connected in series at both ends of the secondary output unit; the connection point of the first output capacitor and the second output capacitor and the connection point of the first load and the second load are connected to each other as the voltage-equalizing end of the secondary output unit.
[0017] In the voltage-equalizing resonant circuit described in the utility model, the primary input module includes an input capacitor, a switch tube three-phase full-bridge unit, a first resonant capacitor, a first resonant inductor, a second resonant capacitor, a second resonant inductor, a third resonant capacitor and a third resonant inductor; the first input end of the switch tube three-phase full-bridge unit is connected to the first end of the input capacitor, the second input end is connected to the second end of the input capacitor, the first output end is connected to the same-name end of the first primary winding via the first resonant inductor and the first resonant capacitor, the second output end is connected to the same-name end of the second primary winding via the second resonant inductor and the second resonant capacitor, and the third output end is connected to the same-name end of the third primary winding via the third resonant inductor and the third resonant capacitor.
[0018] In the voltage-sharing resonant circuit described in the present invention, each of the secondary-side rectifying units includes two rectifying devices connected in series, and the rectifying devices include diodes, MOSFETs, or IGBTs; the switch tube three-phase full-bridge unit includes six switch tubes.
[0019] When implementing the voltage-equalizing resonant circuit of the utility model, when voltage equalization cannot be achieved when connecting a series unbalanced load, by introducing the center tap of the secondary winding of the transformer, that is, the opposite-name ends and the same-name ends of different secondary windings on the same magnetic core, and connecting the center tap to the voltage-equalizing end of the secondary output unit, voltage equalization of the series load in the secondary output unit is achieved, and the entire circuit design is exquisite, the structure is simple, the application range is wide, and because no additional devices are required, the cost is low. Furthermore, the voltage-equalizing resonant circuit of the utility model can be applied to various different resonant circuits, with a wide range of application scenarios and easy promotion. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:
[0021] Figure 1 is a circuit diagram of a full-bridge LLC resonant circuit of the prior art;
[0022] Figure 2 It is a principle block diagram of a preferred embodiment of the voltage-equalizing resonant circuit of the utility model;
[0023] Figure 3 It is a circuit diagram of a preferred embodiment of the voltage-equalizing resonant circuit of the utility model;
[0024] Figure 4 It is a circuit diagram of another preferred embodiment of the voltage-sharing resonant circuit of the utility model;
[0025] Figure 5 It is a circuit diagram of another preferred embodiment of the voltage-sharing resonant circuit of the utility model;
[0026] Figure 6 It is a circuit diagram of another preferred embodiment of the voltage-equalizing resonant circuit of the utility model. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0028] Figure 2 1 is a principle block diagram of a preferred embodiment of the voltage-equalizing resonant circuit of the present utility model. Figure 2 As shown, the voltage-equalizing resonant circuit of the utility model includes a transformer module 200 and a primary input module 100 arranged on the primary side of the transformer module 200. Further, the transformer module 200 includes a primary winding N1, a secondary winding N2 and a secondary winding N3. The voltage-equalizing resonant circuit further includes a secondary rectifier unit 310, a secondary rectifier unit 320 and a secondary output unit 30; the primary input module 100 is connected to the primary winding N1; the same-name end of the secondary winding N2 is connected to the secondary rectifier unit 310, and the opposite-name end is connected to the voltage-equalizing end of the secondary output unit 30; the same-name end of the secondary winding N3 is connected to the voltage-equalizing end of the secondary output unit 30, and the opposite-name end is connected to the secondary rectifier unit 320; the secondary rectifier unit 310 and the secondary rectifier unit 320 are respectively connected in parallel at both ends of the secondary output unit 30. The secondary winding N2 and the secondary winding N3 are the same windings; the secondary output unit 30 includes a first load and a second load connected in series with each other. The first load and the second load are preferably different loads.
[0029] In a preferred embodiment of the present invention, each of the secondary-side rectifying units includes two rectifying devices connected in series, and the rectifying devices include diodes, MOSFETs, or IGBTs.
[0030] In a preferred embodiment of the present utility model, the secondary output unit 30 includes two series capacitors and two series loads, and the two series capacitors and the two series loads are connected in parallel with each other. The connection point of the first output capacitor and the second output capacitor and the connection point of the first load and the second load are connected to each other as the voltage balancing end of the secondary output unit 30.
[0031] When implementing the voltage equalizing resonant circuit of the utility model, when voltage equalization cannot be achieved when connecting a series unbalanced load, a center tap of the secondary winding of the transformer is introduced, and the center tap is connected to the voltage equalizing end of the secondary output unit 30, that is, the secondary winding N2 and the secondary winding N3 on the same magnetic core of the transformer module 200 are connected to the voltage equalizing end of the secondary output unit 30 at the same time, thereby achieving voltage equalization of the series load in the secondary output unit 30, and the entire circuit design is exquisite, the structure is simple, the application range is wide, and since no additional devices are required, the cost is low.
[0032] Figure 3 FIG. 1 is a circuit diagram of a preferred embodiment of the voltage-equalizing resonant circuit of the utility model. Figure 3 As shown, the voltage-equalizing resonant circuit of the utility model includes a transformer module 200 and a primary input module 100 arranged on the primary side of the transformer module 200. Further, the transformer module 200 includes a primary winding N1, a secondary winding N2 and a secondary winding N3. The voltage-equalizing resonant circuit further includes a secondary rectifier unit 310, a secondary rectifier unit 320 and a secondary output unit 30.
[0033] exist Figure 3 In the preferred embodiment shown, the secondary rectifier unit 310 includes switch tubes Q1 and Q2 connected in series, and the secondary rectifier unit 320 includes switch tubes Q3 and Q4 connected in series. The secondary output unit 30 includes an output capacitor C1, an output capacitor C2, a load R1, and a load R2. The output capacitor C1 and the output capacitor C2 are connected in series at both ends of the secondary output unit 30, and the load R1 and the load R2 are also connected in series at both ends of the secondary output unit 30. The connection point between the output capacitor C1 and the output capacitor C2 and the connection point between the load R1 and the load R2 are connected to each other as the voltage equalizing end of the secondary output unit 30. The secondary rectifier unit 310 and the secondary rectifier unit 320 are respectively connected in parallel at both ends of the secondary output unit 30.
[0034] like Figure 3As shown, the same-name end of the secondary winding N2 is connected to the input end of the secondary rectifier unit 310 (i.e., the first end of the switch tube Q1 and the second end of the switch tube Q2), and the opposite-name end is connected to the voltage-equalizing end of the secondary output unit 30. The same-name end of the secondary winding N3 is also connected to the voltage-equalizing end of the secondary output unit 30, and the opposite-name end is connected to the input end of the secondary rectifier unit 320 (i.e., the first end of the switch tube Q3 and the second end of the switch tube Q4). The secondary rectifier unit 310 and the secondary rectifier unit 320 are respectively connected in parallel at the two ends of the secondary output unit 30, that is, the second end of the switch tube Q1 and the second end of the switch tube Q2 are both connected to the first end of the output capacitor C1 and the first end of the load R1; that is, the first end of the switch tube Q3 and the first end of the switch tube Q4 are both connected to the second end of the output capacitor C2 and the second end of the load R2.
[0035] The switch tubes Q1, Q2, Q3 and Q4 can be diodes, IGBTs or MOSFETs. When they are diodes, their first end is an anode and their second end is a cathode. When they are IGBTs or MOSFETs, Figure 3 As shown, the first end is the source, the second end is the drain, and the gate receives a control signal.
[0036] exist Figure 3 In the preferred embodiment shown, the voltage-sharing resonant circuit is an interleaved parallel half-bridge rectifier resonant circuit. Figure 3 As shown, the primary input module 100 includes an input capacitor C4, a switch tube full bridge unit, a resonant capacitor C3 and a resonant inductor L1. The switch tube full bridge unit includes switch tubes Q5, Q6, Q7 and Q8. The first input end of the switch tube full bridge unit (i.e., the second end of the switch tube Q5 and the second end of the switch tube Q7) is connected to the first end of the input capacitor C4, the second input end (i.e., the first end of the switch tube Q6 and the first end of the switch tube Q8) is connected to the second end of the input capacitor C4, the first output end (i.e., the first end of the switch tube Q5 and the second end of the switch tube Q6) is connected to the same-name end of the primary winding N1 via the resonant inductor L1 and the resonant capacitor C3, and the second output end (i.e., the first end of the switch tube Q7 and the second end of the switch tube Q8) is connected to the opposite-name end of the primary winding N1. The switch tubes Q5, Q6, Q7 and Q8 can be IGBTs or MOSFETs. As shown Figure 3 As shown, the first end is the source, the second end is the drain, and the gate receives a control signal.
[0037] exist Figure 3 In the illustrated embodiment, the secondary winding N2 and the secondary winding N3 are the same winding, while the load R1 and the load R2 are different loads.
[0038] Combine the following Figure 3The principle of the utility model is described as follows. Figure 3 As shown, the transformer module 200 includes a primary winding N1, a secondary winding N2 and a secondary winding N3, wherein the secondary winding N2 and the secondary winding N3 are the same windings, that is, the number of turns is the same. The opposite-name end of the secondary winding N2 and the same-name end of the secondary winding N3 are connected to the voltage-equalizing end of the secondary output unit 30 (that is, the connection point of the output capacitors C1 and C2 and the connection point of the loads R1 and R2). In one switching cycle: the voltage of the secondary winding N2 in the positive half cycle is equal to the voltage U1, and the voltage of the secondary winding N3 in the positive half cycle is equal to the voltage U2; the voltage of the secondary winding N2 in the negative half cycle is equal to the voltage U2, and the voltage of the secondary winding N3 in the negative half cycle is equal to the voltage U1. Since the secondary windings N2 and N3 are the same windings and are wound on a magnetic core, that is, the number of turns is the same, the winding voltages are equal, that is, U1=U2 is achieved. Therefore, no matter what the resistance value relationship between load R1 and load R2 is, U1 = U2, achieving the effect of always equalizing the voltage when the circuit is working.
[0039] When implementing the voltage-equalizing resonant circuit of the utility model, when voltage equalization cannot be achieved when connecting a series unbalanced load, by introducing the center tap of the secondary winding of the transformer, that is, the opposite-name ends and the same-name ends of different secondary windings on the same magnetic core, and connecting the center tap to the voltage-equalizing end of the secondary output unit, voltage equalization of the series load in the secondary output unit is achieved, and the entire circuit has a sophisticated design, a simple structure, a wide range of applications, and because no additional devices are required, the cost is low.
[0040] Figure 4 It is a circuit diagram of another preferred embodiment of the voltage-equalizing resonant circuit of the utility model. Figure 4 The embodiment shown and Figure 3 The embodiments shown are similar, except that Figure 4 The voltage-equalizing resonant circuit shown is a primary-side symmetrical half-bridge resonant circuit. Figure 4 As shown, the primary input module 100 includes an input capacitor C4, an input capacitor C5, a switch tube half-bridge unit and a resonant inductor L1. The switch tube half-bridge unit includes switch tubes Q5 and Q6. The first input end (i.e., the second end of the switch tube Q5) of the switch tube half-bridge unit is connected to the first end of the input capacitor C4, the second input end (i.e., the first end of the switch tube Q6) is connected to the second end of the input capacitor C5, and the output end (i.e., the first end of the switch tube Q5 and the second end of the switch tube Q6) is connected to the same-name end of the primary winding N1 through the resonant inductor L1, the second end of the input capacitor C4 is connected to the first end of the input capacitor C5, and the second end of the input capacitor C5 is connected to the opposite-name end of the primary winding N1.
[0041] Similarly, the switch tubes Q5 and Q6 may be IGBTs or MOSFETs. Figure 4As shown, the first end is the source, the second end is the drain, and the gate receives a control signal. Figure 4 The remaining construction and principle of the voltage-equalizing resonant circuit shown are similar to Figure 3 The structure and principle of the voltage-equalizing resonant circuit shown are similar and will not be described again here.
[0042] Figure 5 It is a circuit diagram of another preferred embodiment of the voltage-equalizing resonant circuit of the utility model. Figure 5 The embodiment shown and Figure 3 The embodiments shown are similar, except that Figure 5 The voltage-equalizing resonant circuit shown is a primary-side asymmetric half-bridge resonant circuit. Figure 5 As shown, the primary input module 100 includes an input capacitor C4, a switch tube half-bridge unit, a resonant capacitor C3 and a resonant inductor L1; the first input end of the switch tube half-bridge unit (i.e., the second end of the switch tube Q5) is connected to the first end of the input capacitor C4, the second input end (i.e., the first end of the switch tube Q6) is connected to the second end of the input capacitor C4, and the output end (i.e., the first end of the switch tube Q5 and the second end of the switch tube Q6) is connected to the same-name end of the primary winding N1 via the resonant inductor L1 and the resonant capacitor C3.
[0043] Similarly, the switch tubes Q5 and Q6 may be IGBTs or MOSFETs. Figure 5 As shown, the first end is the source, the second end is the drain, and the gate receives a control signal. Figure 5 The remaining construction and principle of the voltage-equalizing resonant circuit shown are similar to Figure 3 The structure and principle of the voltage-equalizing resonant circuit shown are similar and will not be described again here.
[0044] Figure 6 It is a circuit diagram of another preferred embodiment of the voltage-equalizing resonant circuit of the utility model. Figure 5 The embodiment shown and Figure 3 The embodiments shown are similar, except that Figure 5 The voltage-sharing resonant circuit shown is a three-phase voltage-sharing resonant circuit.
[0045] like Figure 6As shown, the voltage-equalizing resonant circuit of the utility model includes a transformer module 200 and a primary input module 100 arranged on the primary side of the transformer module 200. The transformer module 200 includes a primary winding N11, a primary winding N21, a primary winding N31, a secondary winding N12, a secondary winding N13, a secondary winding N22, a secondary winding N23, a secondary winding N32, and a secondary winding N33. The voltage-equalizing resonant circuit further includes a secondary rectifier unit 310, a secondary rectifier unit 320, a secondary rectifier unit 330, a secondary rectifier unit 340, a secondary rectifier unit 350, a secondary rectifier unit 360, and a secondary output unit.
[0046] The secondary output unit 30 includes an output capacitor C1, an output capacitor C2, a load R1 and a load R2; the output capacitor C1 and the output capacitor C2 are connected in series at both ends of the secondary output unit 30, and the load R1 and the load R2 are also connected in series at both ends of the secondary output unit 30; the connection point between the output capacitor C1 and the output capacitor C2 and the connection point between the load R1 and the load R2 are connected to each other as the voltage balancing end of the secondary output unit 30. The secondary winding N12, the secondary winding N13, the secondary winding N22, the secondary winding N23, the secondary winding N32, and the secondary winding N33 are the same windings.
[0047] like Figure 5 As shown, each of the secondary side rectifying units includes two switch tubes connected in series. Of course, other rectifying devices, such as diodes, MOSFETs, or IGBTs, may also be used.
[0048] The like-name end of the secondary winding N12 is connected to the input end of the secondary rectifier unit 310 (i.e., the connection point of the two rectifier devices), the unlike-name end is connected to the like-name end of the secondary winding N13 and the voltage-equalizing end of the secondary output unit 30, and the unlike-name end of the secondary winding N13 is connected to the input end of the secondary rectifier unit 320 (i.e., the connection point of the two rectifier devices). The same-name end of the secondary winding N22 is connected to the input end of the secondary rectifier unit 330 (i.e., the connection point of the two rectifier devices), the opposite-name end is connected to the same-name end of the secondary winding N23 and the voltage-equalizing end of the secondary output unit 30, and the opposite-name end of the secondary winding N23 is connected to the input end of the secondary rectifier unit 340 (i.e., the connection point of the two rectifier devices); the same-name end of the secondary winding N32 is connected to the input end of the secondary rectifier unit 350 (i.e., the connection point of the two rectifier devices), the opposite-name end is connected to the same-name end of the secondary winding N33 and the voltage-equalizing end of the secondary output unit 30, and the opposite-name end of the secondary winding N33 is connected to the input end of the secondary rectifier unit 360 (i.e., the connection point of the two rectifier devices). The same-name ends of the primary winding N11, the primary winding N21, and the primary winding N31 are respectively connected to the primary input module 100, and the opposite-name ends are connected to each other. The secondary rectifier unit 310 , the secondary rectifier unit 320 , the secondary rectifier unit 330 , the secondary rectifier unit 340 , the secondary rectifier unit 350 and the secondary rectifier unit 360 are respectively connected in parallel at two ends of the secondary output unit 30 .
[0049] Further Figure 6 As shown, the primary input module 100 includes an input capacitor C4, a switch tube three-phase full-bridge unit, a first resonant capacitor C13, a first resonant inductor L11, a second resonant capacitor C23, a second resonant inductor L12, a third resonant capacitor C33 and a third resonant inductor L13; the first input end of the switch tube three-phase full-bridge unit is connected to the first end of the input capacitor C4, the second input end is connected to the second end of the input capacitor C4, the first output end is connected to the same-name end of the primary winding N11 via the first resonant inductor L11 and the first resonant capacitor C13, the second output end is connected to the same-name end of the primary winding N21 via the second resonant inductor L12 and the second resonant capacitor C23, and the third output end is connected to the same-name end of the primary winding N31 via the third resonant inductor L13 and the third resonant capacitor C33.
[0050] The switch tube three-phase full-bridge unit includes six switch tubes, and the connection relationship is as follows: Figure 6 Similarly, the switch tube may be an IGBT or a MOSFET. Figure 6 The remaining construction and principle of the voltage-equalizing resonant circuit shown are similar to Figure 3 The structure and principle of the voltage-equalizing resonant circuit shown are similar and will not be described again here.
[0051] When implementing the voltage-equalizing resonant circuit of the utility model, when voltage equalization cannot be achieved when connecting a series unbalanced load, by introducing the center tap of the secondary winding of the transformer, that is, the opposite-name ends and the same-name ends of different secondary windings on the same magnetic core, and connecting the center tap to the voltage-equalizing end of the secondary output unit, voltage equalization of the series load in the secondary output unit is achieved, and the entire circuit design is exquisite, the structure is simple, the application range is wide, and because no additional devices are required, the cost is low. Furthermore, the voltage-equalizing resonant circuit of the utility model can be applied to various different resonant circuits, with a wide range of application scenarios and easy promotion.
[0052] Although the present invention is described through specific embodiments, it should be understood by those skilled in the art that various changes and equivalent substitutions may be made to the present invention without departing from the scope of the present invention. In addition, various modifications may be made to the present invention for specific situations or materials without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed, but should include all implementation methods that fall within the scope of the claims of the present invention.
[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A voltage-sharing resonant circuit, comprising a transformer module and a primary input module arranged on the primary side of the transformer module, characterized in that: The transformer module includes a primary winding, a first secondary winding and a second secondary winding; the voltage-equalizing resonant circuit further includes a first secondary rectifier unit, a second secondary rectifier unit and a secondary output unit; the primary input module is connected to the primary winding; the same-name end of the first secondary winding is connected to the first secondary rectifier unit, and the opposite-name end is connected to the voltage-equalizing end of the secondary output unit; the same-name end of the second secondary winding is connected to the voltage-equalizing end of the secondary output unit, and the opposite-name end is connected to the second secondary rectifier unit; the first secondary rectifier unit and the second secondary rectifier unit are respectively connected in parallel at both ends of the secondary output unit; the first secondary winding and the second secondary winding are the same winding; the secondary output unit includes a first load and a second load connected in series with each other.
2. The voltage-sharing resonant circuit according to claim 1, characterized in that: The secondary output unit further includes a first output capacitor and a second output capacitor; the first output capacitor and the second output capacitor are connected in series at both ends of the secondary output unit, and the first load and the second load are also connected in series at both ends of the secondary output unit; the connection point of the first output capacitor and the second output capacitor and the connection point of the first load and the second load are connected to each other as the voltage equalizing end of the secondary output unit.
3. The voltage-sharing resonant circuit according to claim 2, characterized in that: Each of the secondary-side rectifying units includes two rectifying devices connected in series, and the rectifying devices include diodes, MOSFETs, or IGBTs. The first load and the second load are different loads.
4. The voltage-sharing resonant circuit according to any one of claims 1 to 3, characterized in that: The primary input module includes an input capacitor, a switch tube full-bridge unit, a resonant capacitor and a resonant inductor; the first input end of the switch tube full-bridge unit is connected to the first end of the input capacitor, the second input end is connected to the second end of the input capacitor, the first output end is connected to the same-name end of the primary winding via the resonant inductor and the resonant capacitor, and the second output end is connected to the opposite-name end of the primary winding.
5. The voltage-sharing resonant circuit according to any one of claims 1 to 3, characterized in that: The primary input module includes a first input capacitor, a second input capacitor, a switch tube half-bridge unit and a resonant inductor; the first input end of the switch tube half-bridge unit is connected to the first end of the first input capacitor, the second input end is connected to the second end of the second input capacitor, the output end is connected to the same-name end of the primary winding through the resonant inductor, and the second end of the first input capacitor is connected to the first end of the second input capacitor and the opposite-name end of the primary winding.
6. The voltage-sharing resonant circuit according to any one of claims 1 to 3, characterized in that: The primary input module includes an input capacitor, a switch tube half-bridge unit, a resonant capacitor and a resonant inductor; the first input end of the switch tube half-bridge unit is connected to the first end of the input capacitor, the second input end is connected to the second end of the input capacitor and the opposite end of the primary winding, and the output end is connected to the same end of the primary winding via the resonant inductor and the resonant capacitor.
7. A voltage-sharing resonant circuit, comprising a transformer module and a primary input module arranged on the primary side of the transformer module, characterized in that: The transformer module comprises a first primary winding, a second primary winding, a third primary winding, a first secondary winding, a second secondary winding, a third secondary winding, a fourth secondary winding, a fifth secondary winding, and a sixth secondary winding; The voltage-equalizing resonant circuit further includes a first secondary rectifier unit, a second secondary rectifier unit, a third secondary rectifier unit, a fourth secondary rectifier unit, a fifth secondary rectifier unit, a sixth secondary rectifier unit and a secondary output unit; the same-name end of the first secondary winding is connected to the first secondary rectifier unit, the opposite-name end is connected to the same-name end of the second secondary winding and the voltage-equalizing end of the secondary output unit, and the opposite-name end of the second secondary winding is connected to the second secondary rectifier unit; the same-name end of the third secondary winding is connected to the third secondary rectifier unit, the opposite-name end is connected to the same-name end of the fourth secondary winding and the voltage-equalizing end of the secondary output unit, and the opposite-name end of the fourth secondary winding is connected to the fourth secondary rectifier unit; the same-name end of the fifth secondary winding is connected to the fifth secondary rectifier unit, the opposite-name end is connected to the same-name end of the sixth secondary winding and the voltage-equalizing end of the secondary output unit, and the opposite-name end of the sixth secondary winding is connected to the sixth secondary rectifier unit; The same-named ends of the first primary winding, the second primary winding and the third primary winding are respectively connected to the primary input module, and the opposite-named ends are connected to each other; The first secondary rectifier unit, the second secondary rectifier unit, the third secondary rectifier unit, the fourth secondary rectifier unit, the fifth secondary rectifier unit and the sixth secondary rectifier unit are respectively connected in parallel at two ends of the secondary output unit; The first secondary winding, the second secondary winding, the third secondary winding, the fourth secondary winding and the fifth secondary winding are the same winding; The secondary side output unit includes a first load and a second load connected in series with each other.
8. The voltage-sharing resonant circuit according to claim 7, characterized in that: The secondary output unit further includes a first output capacitor and a second output capacitor; the first output capacitor and the second output capacitor are connected in series at both ends of the secondary output unit, and the first load and the second load are also connected in series at both ends of the secondary output unit; the connection point of the first output capacitor and the second output capacitor and the connection point of the first load and the second load are connected to each other as the voltage equalizing end of the secondary output unit.
9. The voltage-sharing resonant circuit according to claim 8, characterized in that: The primary input module includes an input capacitor, a switch tube three-phase full-bridge unit, a first resonant capacitor, a first resonant inductor, a second resonant capacitor, a second resonant inductor, a third resonant capacitor and a third resonant inductor; the first input end of the switch tube three-phase full-bridge unit is connected to the first end of the input capacitor, the second input end is connected to the second end of the input capacitor, the first output end is connected to the same-name end of the first primary winding via the first resonant inductor and the first resonant capacitor, the second output end is connected to the same-name end of the second primary winding via the second resonant inductor and the second resonant capacitor, and the third output end is connected to the same-name end of the third primary winding via the third resonant inductor and the third resonant capacitor.
10. The voltage-sharing resonant circuit according to claim 9, characterized in that: Each of the secondary side rectifier units includes two rectifier devices connected in series, and the rectifier devices include diodes, MOSFETs, or IGBTs; the switch tube three-phase full-bridge unit includes six switch tubes.