A resonant conversion circuit

Abstract

The utility model discloses a resonant conversion circuit belongs to the field of power electronic converter, including the primary side switch module, resonance module, secondary side switch module, the primary side switch module, the resonance module, the secondary side switch module are connected in proper order, the resonance module includes first electric capacity, second electric capacity, first inductance, second inductance and first autotransformer, first electric capacity, first inductance, first autotransformer, second inductance, second electric capacity series connection is connected, the utility model discloses a resonant conversion circuit has reduced the number of winding, reduced the current effective value of the secondary side winding, thereby reduced the transformer winding loss, simultaneously, also reduced the current effective value of flowing through rectifier tube, effectively reduced the conduction loss of rectifier tube.

Description

Technical Field

[0001] This invention relates to the field of power electronic converters, and more particularly to a resonant converter circuit. Background Technology

[0002] With the continuous advancement of power electronics technology, higher frequency, higher efficiency, and higher power density have become core development trends in the power supply field. Traditional LLC resonant converter circuits transmit power through isolation transformers. However, transformers have a large number of primary and secondary windings, large effective current values ​​within the windings, a large overall transformer size, and significant winding losses, all of which hinder improvements in efficiency and power density. These issues directly restrict the improvement of LLC resonant converter circuits in terms of high efficiency and high power density, making it difficult to meet the current development needs of power supply technology.

[0003] Therefore, an innovative resonant converter circuit is still needed that can effectively reduce winding losses, thereby improving the overall efficiency and power density of the converter circuit. Summary of the Invention

[0004] The present invention aims to provide a resonant converter circuit.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: A resonant converter circuit includes a primary-side switching module, a resonant module, and a secondary-side switching module; the primary-side switching module, the resonant module, and the secondary-side switching module are connected in sequence; the resonant module includes a first capacitor, a second capacitor, a first inductor, a second inductor, and a first autotransformer; the first capacitor, the first inductor, the first autotransformer, the second inductor, and the second capacitor are connected in series.

[0006] In one specific embodiment, the first autotransformer includes a first winding, a second winding, and a third winding, and the first inductor, the first winding, the second winding, the third winding, and the second inductor are connected in series.

[0007] Furthermore, the turns ratio of the first winding, the second winding, and the third winding is n:1:n, and the turns ratio of the resonant converter circuit is (2n+2):1.

[0008] Furthermore, the secondary switch module includes a fifth switch, a sixth switch, a seventh switch, and an eighth switch; the first terminal of the fifth switch is connected to the first terminal of the output voltage, the second terminal of the fifth switch is connected to the first terminal of the seventh switch, the second terminal of the seventh switch is connected to the second terminal of the output voltage, the first terminal of the sixth switch is connected to the first terminal of the fifth switch, the second terminal of the sixth switch is connected to the first terminal of the eighth switch, and the second terminal of the eighth switch is connected to the second terminal of the seventh switch; the midpoint of the connection between the first winding and the second winding is connected to the midpoint of the connection between the fifth switch and the seventh switch, and the midpoint of the connection between the second winding and the third winding is connected to the midpoint of the connection between the sixth switch and the eighth switch.

[0009] In one specific embodiment, the first autotransformer includes a fourth winding, a fifth winding, a sixth winding, and a seventh winding, and the first inductor, the fourth winding, the fifth winding, the sixth winding, the seventh winding, and the second inductor are connected in series.

[0010] Furthermore, the turns ratio of the fourth, fifth, sixth, and seventh windings is n:1:1:n, and the turns ratio of the resonant converter circuit is (2n+3):1.

[0011] Furthermore, the secondary switch module includes a ninth switch and a tenth switch. The first end of the ninth switch is connected to the midpoint of the connection between the fourth winding and the fifth winding, and the second end of the ninth switch is connected to the second end of the output voltage. The first end of the tenth switch is connected to the midpoint of the connection between the sixth winding and the seventh winding, and the second end of the tenth switch is connected to the second end of the output voltage. The fifth winding and the sixth winding are connected to the first end of the output voltage.

[0012] Furthermore, the primary-side switch module includes a first switch, a second switch, a third switch, and a fourth switch; the first terminal of the first switch is connected to the positive terminal of the input voltage, the second terminal of the first switch is connected to the first terminal of the third switch, the first terminal of the second switch is connected to the first terminal of the first switch, the second terminal of the second switch is connected to the first terminal of the fourth switch, the second terminal of the fourth switch is connected to the second terminal of the third switch, and the second terminals of the third and fourth switches are connected to the first terminal of the output voltage.

[0013] In one specific embodiment, a clamping module is also included, which is connected to the primary-side switch module.

[0014] Furthermore, the clamping module includes a third capacitor, a first diode, and a second diode; the first terminal of the third capacitor is connected to the positive terminal of the input voltage, the second terminal of the third capacitor is connected to the anode of the first diode, the cathode of the first diode is connected to the second terminal of the first switch, the anode of the second diode is connected to the second terminal of the third capacitor, and the cathode of the second diode is connected to the first terminal of the fourth switch.

[0015] In one specific embodiment, a pre-charging module is further included, wherein a first terminal of the pre-charging module is connected to the positive terminal of the input voltage, and a second terminal of the pre-charging module is connected to the first terminal of the output voltage.

[0016] In one specific embodiment, a third inductor and a fourth inductor are also included. The first end of the third inductor is connected to the second end of the first capacitor, the second end of the third inductor is connected to the first end of the first inductor, the first end of the fourth inductor is connected to the first end of the second inductor, and the second end of the fourth inductor is connected to the second end of the second capacitor. In this case, the primary-side switch and the secondary-side switch are located on the same side of the magnetic core of the first autotransformer.

[0017] In one specific embodiment, a fifth inductor and a sixth inductor are also included. The first end of the fifth inductor is connected to the second end of the third switch and the fourth switch, the second end of the fifth inductor is connected to the first end of the output voltage, the first end of the sixth inductor is connected to the positive terminal of the input voltage, and the second end of the sixth inductor is connected to the first end of the first switch and the second switch. At this time, the primary-side switch and the secondary-side switch are arranged on both sides of the magnetic core of the first autotransformer.

[0018] In one specific embodiment, the system includes a primary-side switching module, a resonant module, and a secondary-side switching module; the primary-side switching module, the resonant module, and the secondary-side switching module are connected sequentially; the resonant module includes a fourth capacitor, a seventh inductor, and a second autotransformer; the second terminal of an eleventh switch, the fourth capacitor, the seventh inductor, and the second autotransformer are connected in series; the second autotransformer includes an eighth winding, a ninth winding, and a tenth winding, and the seventh inductor, the eighth winding, the ninth winding, and the tenth winding are connected in series; the first terminal of a thirteenth switch is connected to the first terminal of the ninth winding, and the first terminal of a fourteenth switch is connected to the second terminal of the tenth winding; Furthermore, the turns ratios of the eighth, ninth, and tenth windings of the second autotransformer are n:1:1, and the voltage conversion ratio of the resonant converter circuit is (2n+3):1.

[0019] In one specific embodiment, the resonant module further includes a fifth capacitor, an eighth inductor, and a third autotransformer. The second terminal of the fifteenth switch, the fifth capacitor, the eighth inductor, and the third autotransformer are connected in series. The third autotransformer includes an eleventh winding, a twelfth winding, and a thirteenth winding. The eighth inductor, the eleventh winding, the twelfth winding, and the thirteenth winding are connected in series. The first terminal of the seventeenth switch is connected to the first terminal of the twelfth winding, and the first terminal of the eighteenth switch is connected to the second terminal of the thirteenth winding. Furthermore, the turns ratio of the eleventh, twelfth, and thirteenth windings of the third autotransformer is n:1:1, and the voltage conversion ratio of the resonant converter circuit is (4n+5):1.

[0020] In one specific embodiment, the system includes a primary-side switching module, a resonant module, and a secondary-side switching module; the primary-side switching module, the resonant module, and the secondary-side switching module are connected sequentially; the resonant module includes a sixth capacitor, a ninth inductor, and a fourth autotransformer; the second terminal of the nineteenth switch, the sixth capacitor, the ninth inductor, and the fourth autotransformer are connected in series; the fourth autotransformer includes a fourteenth winding and a fifteenth winding, and the ninth inductor, the fourteenth winding, and the fifteenth winding are connected in series; the second terminal of the twenty-first switch is connected to the second terminal of the fourteenth winding, and the second terminal of the twenty-third switch is connected to the second terminal of the fifteenth winding; The turns ratio of the fourteenth and fifteenth windings of the fourth autotransformer is n:1, and the voltage conversion ratio of the resonant converter circuit is 2(n+1):1.

[0021] In one specific embodiment, the resonant module further includes a seventh capacitor, a tenth inductor, and a fifth autotransformer. The second terminal of the twenty-fifth switch, the seventh capacitor, the tenth inductor, and the fifth autotransformer are connected in series. The fifth autotransformer includes a sixteenth winding and a seventeenth winding. The tenth inductor, the sixteenth winding, and the seventeenth winding are connected in series. The second terminal of the twenty-seventh switch is connected to the second terminal of the sixteenth winding, and the second terminal of the twenty-ninth switch is connected to the second terminal of the seventeenth winding. Furthermore, the turns ratio of the sixteenth and seventeenth windings of the fifth autotransformer is n:1, and the voltage conversion ratio of the resonant converter circuit is (4n+3):1.

[0022] In one specific embodiment, the system includes a primary-side switching module, a resonant module, and a secondary-side switching module; the primary-side switching module, the resonant module, and the secondary-side switching module are connected sequentially; the resonant module includes an eighth capacitor, an eleventh inductor, a ninth capacitor, a twelfth inductor, a tenth capacitor, a thirteenth inductor, a sixth autotransformer, a seventh autotransformer, and an eighth autotransformer; the eighth capacitor and the eleventh inductor are connected in series and then connected to the first end of the primary winding of the sixth autotransformer; the ninth capacitor and the twelfth inductor are connected in series and then connected to the first end of the primary winding of the seventh autotransformer; the tenth capacitor and the thirteenth inductor are connected in series and then connected to the first end of the primary winding of the eighth autotransformer; the midpoint of the connection between the thirty-first and thirty-second switches is connected to the eighth capacitor, the midpoint of the connection between the thirty-third and thirty-fourth switches is connected to the ninth capacitor, and the midpoint of the connection between the thirty-fifth and thirty-sixth switches is connected to the tenth capacitor; Furthermore, the second end of the primary winding of the sixth autotransformer is connected to the first end of the secondary winding of the sixth autotransformer; the second end of the primary winding of the seventh autotransformer is connected to the first end of the secondary winding of the seventh autotransformer; and the second end of the primary winding of the eighth autotransformer is connected to the first end of the secondary winding of the eighth autotransformer.

[0023] Furthermore, the secondary windings of the sixth autotransformer, the seventh autotransformer, and the eighth autotransformer are connected in a star configuration. Furthermore, the turns ratio of the primary winding to the secondary winding of the sixth autotransformer is n:1, the turns ratio of the primary winding to the secondary winding of the seventh autotransformer is n:1, the turns ratio of the primary winding to the secondary winding of the eighth autotransformer is n:1, and the voltage conversion ratio of the resonant converter circuit is (n+2):1.

[0024] In one specific embodiment, the secondary windings of the ninth autotransformer, the tenth autotransformer, and the eleventh autotransformer are connected in a delta configuration. Furthermore, the turns ratio of the primary winding to the secondary winding of the ninth autotransformer is n:1, the turns ratio of the primary winding to the secondary winding of the tenth autotransformer is n:1, the turns ratio of the primary winding to the secondary winding of the eleventh autotransformer is n:1, and the voltage conversion ratio of the resonant converter circuit is (2n+2):1.

[0025] Beneficial effects: The resonant converter circuit provided by this invention reduces the power transmitted through isolation conversion. This process reduces the effective value of the current flowing through the secondary winding, thereby reducing transformer winding losses; simultaneously, it also reduces the effective value of the current flowing through the rectifier diode, effectively reducing the rectifier diode's conduction losses; furthermore, this circuit topology reduces the voltage stress on the primary-side switch. The secondary side employs a full-bridge rectifier, and the autotransformer winding design improves the winding structure of the non-isolation transformer, making the winding more symmetrical and reducing the voltage stress on the secondary-side switch. In addition, a clamping module is added to reduce the voltage stress on the first or second switch. A pre-charge module is added to charge the output voltage V... o After pre-charging to the normal operating voltage, the main power circuit starts working, which reduces the voltage stress on the primary side switching circuit. The resonant inductor can be designed independently or the leakage inductance of the transformer can be used as the resonant inductor, which can effectively reduce the effective value of the primary side resonant cavity current and reduce copper losses; it also reduces the volt-second of the secondary winding, effectively reducing the design difficulty of the transformer.

[0026] To make the above-mentioned features and advantages of the invention more apparent and understandable, specific embodiments are described below, and detailed descriptions are provided in conjunction with the accompanying drawings. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a resonant converter circuit according to the present invention.

[0028] Figure 2 This is a circuit topology diagram of a first specific embodiment of a resonant converter circuit according to the present invention.

[0029] Figure 3 for Figure 2 The current flow path of the first specific embodiment shown.

[0030] Figure 4 for Figure 2 The diagram shows the switching timing and current waveform of the first specific embodiment.

[0031] Figure 5 This is a circuit topology diagram of a second specific embodiment of a resonant converter circuit according to the present invention.

[0032] Figure 6 for Figure 4 The current flow path of the second specific embodiment shown.

[0033] Figure 7 for Figure 4 The diagram shows the switching timing and current waveform of the second specific embodiment.

[0034] Figure 8 This is a circuit topology diagram of a third specific embodiment of a resonant converter circuit according to the present invention.

[0035] Figure 9 This is a circuit topology diagram of a fourth specific embodiment of a resonant converter circuit according to the present invention.

[0036] Figure 10 This is a circuit topology diagram of a fifth specific embodiment of a resonant converter circuit according to the present invention.

[0037] Figure 11 This is a circuit topology diagram of a sixth specific embodiment of a resonant converter circuit according to the present invention.

[0038] Figure 12 This is a circuit topology diagram of a seventh specific embodiment of a resonant converter circuit according to the present invention.

[0039] Figure 13 for Figure 12 The circuit board layout diagram of the winding in the seventh specific embodiment is shown.

[0040] Figure 14 This is a circuit topology diagram of an eighth specific embodiment of a resonant converter circuit according to the present invention.

[0041] Figure 15 for Figure 14 The circuit board layout diagram of the winding in the eighth specific embodiment is shown.

[0042] Figure 16 This is a circuit topology diagram of a ninth specific embodiment of a resonant converter circuit according to the present invention.

[0043] Figure 17 This is a circuit topology diagram of a tenth specific embodiment of a resonant converter circuit according to the present invention.

[0044] Figure 18 This is a circuit topology diagram of the eleventh specific embodiment of a resonant converter circuit of the present invention.

[0045] Figure 19 This is a circuit topology diagram of a twelfth specific embodiment of a resonant converter circuit according to the present invention.

[0046] Figure 20 This is a circuit topology diagram of a thirteenth specific embodiment of a resonant converter circuit according to the present invention.

[0047] Figure 21 This is a circuit topology diagram of the fourteenth specific embodiment of a resonant converter circuit according to the present invention.

[0048] In the accompanying drawings, similar reference numerals refer to the same elements. Detailed Implementation

[0049] To make the objectives and technical solutions of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0050] Figure 1 This is a schematic diagram of the structure of a resonant converter circuit according to the present invention. Figure 1 As shown, a resonant converter circuit includes: a primary-side switching module 11, a resonant module 12, and a secondary-side switching module 13. The input voltage V... IN The primary-side switching module 11, the resonant module 12, the secondary-side switching module 13, and the output voltage V o Connect them sequentially.

[0051] More specifically, the resonant converter circuit of the present invention further includes a capacitor C. I-O Capacitor C I-O The first terminal is connected to the input voltage V IN The positive terminal, capacitor C I-O The second terminal is connected to the output voltage V o The first terminal, capacitor C I-O It also connects to the primary-side switch module 11, capacitor C I-O This is the input filter circuit for the primary-side switching module 11.

[0052] More specifically, the resonant converter circuit of the present invention further includes a capacitor C. o Capacitor C o The first terminal is connected to the output voltage V o The first terminal, capacitor C o The second terminal is grounded and the output voltage V o The second end serves as an output filter and energy storage unit.

[0053] More specifically, the primary-side switching module 11 converts the input voltage V IN The AC voltage is converted to AC voltage and transmitted to resonant module 12. Resonant module 12 then transmits the AC voltage to secondary-side switching module 13, which converts it into output voltage V. o .

[0054] More specifically, the primary-side switching module 11 is connected to the input voltage V. INBy controlling the on and off states of the internal switches, the input electrical energy is converted into a high-frequency pulse signal that matches the inherent frequency of the resonant network. The resonant module 12 uses the resonance principle to make the voltage and current in the circuit present a specific phase relationship, creating zero voltage (ZVS) or zero current (ZCS) conditions when the switching devices switch, eliminating the switching losses of traditional hard switches and improving the efficiency of the conversion circuit. The secondary-side switching module 13, through timing coordination with the primary-side switching module 11, turns on and off under zero voltage or zero current conditions, converting high-frequency AC power into low-ripple DC power, significantly reducing rectification losses.

[0055] Figure 2 This is a circuit topology diagram of a first specific embodiment of a resonant converter circuit according to the present invention. Figure 2 As shown, a resonant converter circuit includes: a primary-side switching module 21, a resonant module 22, and a secondary-side switching module 23. The input voltage V... IN The primary-side switching module 21, the resonant module 22, the secondary-side switching module 23, and the output voltage V o Connect them sequentially.

[0056] Furthermore, the primary-side module 21 includes a switch Q. 21 Switch Q 22 Switch Q 23 Switch Q 24 Switch Q 21 The first terminal is connected to the input voltage V IN The positive terminal, switch Q 21 The second end is connected to switch Q 23 The first terminal, switch Q 22 The first end is connected to switch Q 21 The first terminal, switch Q 22 The second end is connected to switch Q 24 The first terminal, switch Q 24 The second end is connected to switch Q 23 The second terminal, switch Q 23 and switch Q 24 The second terminal is connected to the output voltage V o The first end.

[0057] Furthermore, the resonant module 22 includes a capacitor C. r21 Capacitor C r22 Inductor L r21 Inductor L r22 and autotransformer T 21 Switch Q 21 The second terminal, capacitor C r21 Inductor L r21 Autotransformer T 21 Inductor L r22 Capacitor Cr22 Switch Q 24 The first end is connected in series.

[0058] Furthermore, the autotransformer T 21 Including winding N 21 Winding N 22 Winding N 23 Inductor L r21 Winding N 21 Winding N 22 Winding N 23 Inductor L r22 Series connection.

[0059] Furthermore, winding N 21 Winding N 22 Winding N 23 With a turns ratio of n:1:n, the turns ratio of the resonant converter circuit is (2n+2):1.

[0060] Optionally, winding N 21 Winding N 22 Winding N 23 They can be wound on the same magnetic core at the same time.

[0061] Furthermore, the secondary-side switch module 23 includes switch Q. 25 Switch Q 26 Switch Q 27 Switch Q 28 Switch Q 25 The first terminal is connected to the output voltage V o The first terminal, switch Q 25 The second end is connected to switch Q 27 The first terminal, switch Q 27 The second terminal is the output voltage V o The second terminal, switch Q 26 The first end is connected to switch Q 25 The first terminal, switch Q 26 The second end is connected to switch Q 28 The first terminal, switch Q 28 The second end is connected to switch Q 27 The second end, winding N 21 With winding N 22 Midpoint connection switch Q 25 With switch Q 27 The connection midpoint, winding N 22 With winding N 23 Midpoint connection switch Q 26 With switch Q 28 The midpoint of the connection.

[0062] More specifically, the resonant converter circuit of the present invention further includes a capacitor C. I-O Capacitor C I-O Connected to switch Q 21 The first terminal and switch Q 23 Between the second terminals, capacitor C I-O This is the input filter circuit for the primary-side switching module 21.

[0063] More specifically, the resonant converter circuit of the present invention further includes a capacitor C. o Capacitor C o The first terminal is connected to the output voltage V o Capacitor C o The second terminal is grounded, serving as an output filter and energy storage unit.

[0064] The following continues... Figure 2 The working principle of the circuit. Figure 3 for Figure 2 The current flow path of the first specific embodiment shown is as follows: Figure 4 for Figure 2 A schematic diagram of the switching timing and current waveforms in a specific embodiment is shown. Figure 3 and Figure 4 As shown, here winding N 21 and winding N 23 The number of turns is n, and the winding is N. 22 The working process is explained using a 1-turn switch as an example. 21 Switch Q 24 Switch Q 25 Switch Q 28 When conducting, the current i 21 Along the first path, i.e., the input voltage V IN Switch Q 21 Capacitor C r21 Inductor L r21 Winding N 21 Switch Q 25 Output voltage V o A circuit is formed, at which point energy is directly transferred from the input to the output, and the capacitor C... r21 Energy storage, winding N 21 The current flowing through it is i Current i 22 Along the second path, i.e., winding N 22 Switch Q 25 Output voltage V o Switch Q 28 A circuit is formed, at which point energy is transferred to the output through isolation transformation, winding N 22 The induced current in the middle is 2ni Currenti 23 Along the third path, i.e., switch Q 24 Output voltage V o Switch Q 28 Winding N 23 Inductor L r22 Capacitor C r22 A circuit is formed, at which point the capacitor C r22 The stored energy is transferred to the output, winding N 23 The current flowing through is i Therefore, it can be seen that only (2ni) / (i+i+2ni) Power is transmitted to the secondary side after isolation conversion. The turns ratio of the resonant converter circuit is... (i+i+2ni) / i .

[0065] Compared to traditional resonant converter circuits, the resonant converter circuit provided in this specific embodiment reduces the power transmitted through isolation conversion. This process reduces the effective value of the current flowing through the secondary winding, thereby reducing transformer winding losses; simultaneously, it also reduces the effective value of the current flowing through the rectifier diode, effectively reducing the rectifier diode's conduction losses; furthermore, this circuit topology reduces the primary-side switching Q... 21 Q 22 Q 23 Q 24 Voltage stress. The secondary side uses a full-bridge rectifier, and the N winding of the autotransformer... 21 and winding N 23 With the same number of turns, this design improves the winding structure of non-isolation transformers, making the windings more symmetrical and reducing the secondary-side switching Q. 25 Q 26 Q 27 Q 28 Voltage stress.

[0066] Figure 5 This is a circuit topology diagram of a second specific embodiment of a resonant converter circuit according to the present invention. Figure 5 As shown, a resonant converter circuit includes: a primary-side switching module 51, a resonant module 52, and a secondary-side switching module 53. The input voltage V... IN 51. Primary-side switching module; 52. Resonant module; 53. Secondary-side switching module; Output voltage V o Connect them sequentially.

[0067] Furthermore, the primary-side module 51 includes a switch Q. 51 Switch Q 52 Switch Q 53 Switch Q 54 Switch Q 51 The first terminal is connected to the input voltage V IN The positive terminal, switch Q 51 The second end is connected to switch Q53 The first terminal, switch Q 52 The first end is connected to switch Q 51 The first terminal, switch Q 52 The second end is connected to switch Q 54 The first terminal, switch Q 54 The second end is connected to switch Q 53 The second terminal, switch Q 53 and switch Q 54 The second terminal is connected to the output voltage V o The first end.

[0068] Furthermore, the resonant module 52 includes a capacitor C. r51 Capacitor C r52 Inductor L r51 Inductor L r52 and autotransformer T 51 Switch Q 51 The second terminal, capacitor C r51 Inductor L r51 Autotransformer T 51 Inductor L r52 Capacitor C r52 Switch Q 54 The first end is connected in series.

[0069] Furthermore, the autotransformer T 51 Also includes winding N 51 Winding N 52 Winding N 53 Winding N 54 Inductor L r51 Winding N 51 Winding N 52 Winding N 53 Winding N 54 Inductor L r52 Series connection.

[0070] Furthermore, winding N 51 Winding N 52 Winding N 53 Winding N 54 The turns ratio is n:1:1:n, and the turns ratio of the resonant converter circuit is (2n+3):1.

[0071] Optionally, winding N 51 Winding N 52 Winding N 53 Winding N 54 They can be wound on the same magnetic core at the same time.

[0072] Furthermore, the secondary-side switch module 53 includes switch Q. 55 Switch Q56 Switch Q 55 The first end is connected to winding N 51 and winding N 52 The connection midpoint, switch Q 55 The second terminal is connected to the output voltage V o The second terminal, switch Q 56 The first end is connected to winding N 53 and winding N 54 The connection midpoint, switch Q 56 The second terminal is connected to the output voltage V o The second end, winding N 52 and winding N 53 The midpoint of the connection is connected to the output voltage V. o The first end.

[0073] More specifically, the resonant converter circuit of the present invention further includes a capacitor C. I-O Capacitor C I-O Connected to switch Q 51 The first terminal and switch Q 53 Between the second terminals, capacitor C I-O This is the input filter circuit for the primary-side switching module 51.

[0074] More specifically, the resonant converter circuit of the present invention further includes a capacitor C. o Capacitor C o The first terminal is connected to the output voltage V o Capacitor C o The second terminal is grounded, serving as an output filter and energy storage unit.

[0075] The following continues... Figure 5 The working principle of the circuit. Figure 6 for Figure 5 The current flow path of the second specific embodiment shown is as follows: Figure 7 for Figure 5 A schematic diagram of the switching timing and current waveforms in a specific embodiment is shown. Figure 6 and Figure 7 As shown, here winding N 51 and winding N 54 The number of turns is m, and the winding number is N. 52 and winding N 53 The working process is explained using a 1-turn switch as an example. 51 Switch Q 54 Switch Q 56 When conducting, the current i 51 Along the first path, i.e., the input voltage V IN Switch Q 51 Capacitor C r51 Inductor Lr51 Winding N 51 Winding N 52 Output voltage V o A circuit is formed, at which point energy is directly transferred from the input to the output, and simultaneously the capacitor C... r51 Energy storage, winding N 51 and winding N 52 The current flowing through is i Current i 52 Along the second path, i.e., winding N 53 Output voltage V o Switch Q 56 A circuit is formed, at which point energy is transferred to the output through isolation transformation, winding N 53 The induced current is (i+2mi) Current i 53 Along the third path, i.e., switch Q 54 Output voltage V o Switch Q 56 Winding N 54 Inductor L r52 Capacitor C r52 A circuit is formed, at which point the capacitor C r52 Energy is transferred to the output, winding N 54 The current flowing through is i Therefore, it can be seen that only (i+2mi) / (2mi+3i) The power is converted through isolation. The turns ratio of the resonant converter circuit is... (2mi+3i):i .

[0076] Compared to traditional resonant converter circuits, the resonant converter circuit provided in this specific embodiment reduces the power transmitted through isolation conversion. This process reduces the effective value of the current flowing through the secondary winding, thereby reducing transformer winding losses; simultaneously, it also reduces the effective value of the current flowing through the rectifier diode, effectively reducing the rectifier diode's conduction losses; furthermore, there is no idle winding on the secondary side. In this circuit topology, the secondary winding can be used as the excitation winding, effectively reducing the number of turns in the primary winding, which not only improves winding utilization but also further reduces winding losses; at the same time, this circuit topology reduces the primary-side switching Q... 51 Q 52 Q 53 Q 54 Voltage stress.

[0077] Figure 8 This is a circuit topology diagram of a third specific embodiment of a resonant converter circuit according to the present invention. Figure 8 As shown, a resonant converter circuit includes: a primary-side switching module 81, a resonant module 82, a secondary-side switching module 83, and a clamping module 84. The input voltage V... INPrimary-side switching module 81, resonant module 82, secondary-side switching module 83, output voltage V o The clamping module 84 is connected sequentially to the primary-side switch module 81.

[0078] Furthermore, the primary-side module 81 includes a switch Q. 81 Switch Q 82 Switch Q 83 Switch Q 84 Switch Q 81 The first terminal is connected to the input voltage V IN The positive terminal, switch Q 81 The second end is connected to switch Q 83 The first terminal, switch Q 82 The first end is connected to switch Q 81 The first terminal, switch Q 82 The second end is connected to switch Q 84 The first terminal, switch Q 84 The second end is connected to switch Q 83 The second terminal, switch Q 83 and switch Q 84 The second terminal is connected to the output voltage V o The first end.

[0079] Furthermore, the resonant module 82 includes a capacitor C. r81 Capacitor C r82 Inductor L r81 Inductor L r82 and autotransformer T 81 Switch Q 81 The second terminal, capacitor C r81 Inductor L r81 Autotransformer T 81 Inductor L r82 Capacitor C r82 Switch Q 84 The first end is connected in series.

[0080] Furthermore, the autotransformer T 81 Including winding N 81 Winding N 82 Winding N 83 Inductor L r81 Winding N 81 Winding N 82 Winding N 83 Inductor L r82 Series connection.

[0081] Furthermore, winding N 81 Winding N 82 Winding N 83With a turns ratio of n:1:n, the turns ratio of the resonant converter circuit is (2n+2):1.

[0082] Optionally, winding N 81 Winding N 82 Winding N 83 They can be wound on the same magnetic core at the same time.

[0083] Furthermore, the secondary-side switch module 83 includes switch Q. 85 Switch Q 86 Switch Q 87 Switch Q 88 Switch Q 85 The first terminal is connected to the output voltage V o The first terminal, switch Q 85 The second end is connected to switch Q 87 The first terminal, switch Q 87 The second terminal is the output voltage V o The second terminal, switch Q 86 The first end is connected to switch Q 85 The first terminal, switch Q 86 The second end is connected to switch Q 88 The first terminal, switch Q 88 The second end is connected to switch Q 27 The second end, winding N 81 With winding N 82 Midpoint connection switch Q 85 With switch Q 87 The connection midpoint, winding N 82 With winding N 83 Midpoint connection switch Q 86 With switch Q 88 The midpoint of the connection.

[0084] More specifically, the resonant converter circuit of the present invention further includes a capacitor C. I-O Capacitor C I-O Connected to switch Q 81 The first terminal and switch Q 83 Between the second terminals, capacitor C I-O This is the input filter circuit for the primary-side switching module 81.

[0085] More specifically, the resonant converter circuit of the present invention further includes a capacitor C. o Capacitor C o The first terminal is connected to the output voltage V o Capacitor C o The second terminal is grounded, serving as an output filter and energy storage unit.

[0086] Furthermore, the clamping module 84 includes a capacitor C.clamp diode D 81 and diode D 82 Capacitor C clamp The first terminal is connected to the input voltage V IN The positive terminal, capacitor C clamp The second end is connected to diode D 81 The anode of diode D 81 Cathode connection switch Q 81 The second terminal, diode D 82 Anode connection capacitor C clamp The second terminal, diode D 82 Cathode connection switch Q 84 The first end.

[0087] Compared to the first embodiment, this embodiment adds a clamping module, when V o If not yet established, capacitor C can be used. clamp With capacitor C r81 or capacitor C r82 Voltage divider relationship limiting switch Q 81 Or switch Q 82 Drain-source voltage V ds This reduces the switching Q. 81 Or switch Q 82 Voltage stress. When the output voltage V o When the value is 0, the capacitance C is zero. o Equivalent to a short circuit, input voltage V IN Mainly composed of capacitor C clamp and capacitor C r81 They share the load, and the specific voltage is determined by the capacitance relationship between the two. Switch Q 81 Drain-source voltage V ds For capacitor C clamp and diode D 81 The voltage drop across the switch Q reduces the voltage drop across the switch Q. 81 The effect of voltage stress. For the second switch Q... 82 Similarly, the clamping module can also reduce the switching Q. 82 Voltage stress.

[0088] Compared to traditional resonant converter circuits, the resonant converter circuit provided in this specific embodiment reduces the power transmitted through isolation conversion. This process reduces the effective value of the current flowing through the secondary winding, thereby reducing transformer winding losses; simultaneously, it also reduces the effective value of the current flowing through the rectifier diode, effectively reducing the rectifier diode's conduction losses; furthermore, this circuit topology reduces the primary-side switching Q... 81 Q 82 Q 83 Q 84Voltage stress. The secondary side uses a full-bridge rectifier, and the N winding of the autotransformer... 81 and winding N 83 With the same number of turns, this design improves the winding structure of non-isolation transformers, making the windings more symmetrical and reducing the secondary-side switching Q. 85 Q 86 Q 87 Q 88 Voltage stress.

[0089] Figure 9 This is a circuit topology diagram of a fourth specific embodiment of a resonant converter circuit according to the present invention. Figure 9 As shown, a resonant converter circuit includes: a primary-side switching module 91, a resonant module 92, and a secondary-side switching module 93. The input voltage V... IN Primary-side switching module 91, resonant module 92, secondary-side switching module 93, output voltage V o Connect them sequentially.

[0090] Furthermore, the primary-side module 91 includes a switch Q. 91 Switch Q 92 Switch Q 93 Switch Q 94 Switch Q 91 The first terminal is connected to the input voltage V IN The positive terminal, switch Q 91 The second end is connected to switch Q 93 The first terminal, switch Q 92 The first end is connected to switch Q 91 The first terminal, switch Q 92 The second end is connected to switch Q 94 The first terminal, switch Q 94 The second end is connected to switch Q 93 The second terminal, switch Q 93 and switch Q 94 The second terminal is connected to the output voltage V o The first end.

[0091] Furthermore, the resonant module 92 includes a capacitor C. r91 Capacitor C r92 Inductor L r91 Inductor L r92 and autotransformer T 91 Switch Q 51 The second terminal, capacitor C r91 Inductor L r91 Autotransformer T 91 Inductor L r92 Capacitor C r92 Switch Q 94 The first end is connected in series.

[0092] Furthermore, the autotransformer T 91 Including winding N 91 Winding N 92 Winding N 93 Winding N 94 Inductor L r91 Winding N 91 Winding N 92 Winding N 93 Winding N 94 Inductor L r92 Series connection.

[0093] Furthermore, winding N 91 Winding N 92 Winding N 93 Winding N 94 The turns ratio is n:1:1:n, and the turns ratio of the resonant converter circuit is (2n+3):1.

[0094] Optionally, winding N 91 Winding N 92 Winding N 93 Winding N 94 They can be wound on the same magnetic core at the same time.

[0095] Furthermore, the secondary-side switch module 93 includes switch Q. 95 Switch Q 96 Switch Q 95 The first end is connected to winding N 91 and winding N 92 The connection midpoint, switch Q 95 The second terminal is connected to the output voltage V o The second terminal, switch Q 96 The first end is connected to winding N 93 and winding N 94 The connection midpoint, switch Q 96 The second terminal is connected to the output voltage V o The second end, winding N 92 and winding N 93 The midpoint of the connection is connected to the output voltage V. o The first end.

[0096] More specifically, the resonant converter circuit of the present invention further includes a capacitor C. I-O Capacitor C I-O Connected to switch Q 91 The first terminal and switch Q 93 Between the second terminals, capacitor C I-O This is the input filter circuit for the primary-side switching module 91.

[0097] More specifically, the resonant converter circuit of the present invention further includes a capacitor C. o Capacitor C o The first terminal is connected to the output voltage V o Capacitor C o The second terminal is grounded, serving as an output filter and energy storage unit.

[0098] Furthermore, the clamping module 94 includes a capacitor C. clamp diode D 91 and diode D 92 Capacitor C clamp The first terminal is connected to the input voltage V IN The positive terminal, capacitor C clamp The second terminal is connected to diode D 91 The anode of diode D 91 Cathode connection switch Q 91 The second terminal, diode D 92 Anode connection capacitor C clamp The second terminal, diode D 92 Cathode connection switch Q 94 The first end.

[0099] Compared to the second embodiment, this embodiment adds a clamping module, when V o If not yet established, capacitor C can be used. clamp With capacitor C r91 or capacitor C r92 Voltage divider relationship limiting switch Q 91 Or switch Q 92 Drain-source voltage V ds This reduces the switching Q. 91 Or switch Q 92 Voltage stress. When the output voltage V o When the value is 0, the capacitance C is zero. o Equivalent to a short circuit, input voltage V IN Mainly composed of capacitor C clamp and capacitor C r91 They share the load, and the specific voltage is determined by the capacitance relationship between the two. Switch Q 91 Drain-source voltage V ds For capacitor C clamp and diode D 91 The voltage drop across the switch Q reduces the voltage drop across the switch Q. 91 The effect of voltage stress. For the second switch Q... 92 Similarly, the clamping module can also reduce the switching Q. 92 Voltage stress.

[0100] Compared to traditional resonant converter circuits, the resonant converter circuit provided in this specific embodiment reduces the power transmitted through isolation conversion. This process reduces the effective value of the current flowing through the secondary winding, thereby reducing transformer winding losses; simultaneously, it also reduces the effective value of the current flowing through the rectifier diode, effectively reducing the rectifier diode's conduction losses; furthermore, there is no idle winding on the secondary side. In this circuit topology, the secondary winding can be used as the excitation winding, effectively reducing the number of turns in the primary winding, which not only improves winding utilization but also further reduces winding losses; at the same time, this circuit topology reduces the primary-side switching Q... 91 Q 92 Q 93 Q 94 Voltage stress.

[0101] Figure 10 This is a circuit topology diagram of a fifth specific embodiment of a resonant converter circuit according to the present invention. Figure 10 As shown, in this embodiment... Figure 8 Based on the third embodiment, a pre-charge module 85 is added, and the first terminal of the pre-charge module 85 is connected to the input voltage V. IN The positive terminal of the pre-charge module 85 is connected to the output voltage V. o The first terminal. Add a pre-charge module to increase the output voltage V. o After pre-charging to the normal operating voltage, the main power circuit then starts working, which reduces the primary-side switching voltage stress. The specific form of the pre-charging module is not limited here.

[0102] Figure 11 This is a circuit topology diagram of a sixth specific embodiment of a resonant converter circuit according to the present invention. Figure 11 As shown, in this embodiment... Figure 9 Based on the fourth embodiment, a pre-charge module 95 is added, and the first terminal of the pre-charge module 95 is connected to the input voltage V. IN The positive terminal of the pre-charge module 95 is connected to the output voltage V. o The first terminal. Add a pre-charge module to increase the output voltage V. o After pre-charging to the normal operating voltage, the main power circuit then starts working, which reduces the primary-side switching voltage stress. The specific form of the pre-charging module is not limited here.

[0103] Furthermore, the core of an autotransformer can be used to construct a common-mode inductor to force current sharing in the windings. Figure 12 This is a circuit diagram of a seventh specific embodiment of a resonant converter circuit according to the present invention. In this specific embodiment, the resonant converter circuit... Figure 5 Based on the circuit of the second embodiment, it also includes an inductor L. 51 With inductor L 52 Inductor L 51 The first terminal is connected to capacitor Cr51 The second terminal, inductor L 51 The second end is connected to inductor L r51 The first terminal, inductor L 52 The first end is connected to inductor L r52 The first terminal, inductor L 52 The second terminal is connected to capacitor C r52 The second end.

[0104] If the autotransformer has an odd turns ratio, this explanation will use a resonant transformer circuit with a turns ratio of 4 / 1 as an example. The winding N... 51 and winding N 52 The number of turns is 0.5. When the primary and secondary switches are located on the same side of the autotransformer core, the winding configuration is as follows: Figure 13 As shown, from Figure 13 It can be seen that the lines passing through the two central posts of the magnetic core, including windings ab and de, together with the two central posts, constitute a common-mode inductor to force winding N. 51 and winding N 54 Flow equalization.

[0105] Figure 14 This is a circuit diagram of an eighth specific embodiment of a resonant converter circuit according to the present invention. In this specific embodiment, the resonant converter circuit... Figure 5 Based on the circuit of the second embodiment, it also includes an inductor L. 53 With inductor L 54 Inductor L 53 The first end is connected to switch Q 53 and switch Q 54 The second terminal, inductor L 53 The second terminal is connected to the output voltage V o The first terminal, inductor L 54 The first terminal is connected to the input voltage V IN The positive terminal, inductor L 54 The second end is connected to switch Q 51 and switch Q 52 The first end.

[0106] If the autotransformer has an odd turns ratio, this explanation will use a resonant transformer circuit with a turns ratio of 4 / 1 as an example. The winding N... 51 and winding N 52 The number of turns is 0.5. When the primary and secondary switches are located on both sides of the core of the autotransformer, the winding configuration is as follows: Figure 15 As shown, from Figure 15 It can be seen that the input voltage V IN and output voltage V o The trace passing between the two central posts of the magnetic core, together with the two central posts, forms a common-mode inductor to force the N winding. 51 and winding N54 Flow equalization.

[0107] In summary, regardless of whether the layout is on the same side or opposite side, the core of the autotransformer can be used to construct the common-mode inductor forced winding N. 51 and winding N 54 The only difference between current sharing and common mode inductors is the location of the common mode inductor in the circuit.

[0108] In the above example, the layout diagram is for illustrative purposes only. The number and position of all components, the shape of the magnetic core, the winding width, and the winding implementation can all be set according to the actual situation.

[0109] Figure 16 This is a circuit topology diagram of a ninth specific embodiment of a resonant converter circuit according to the present invention. Figure 16 As shown, a resonant converter circuit includes: a primary-side switching module 161, a resonant module 162, and a secondary-side switching module 163. The input voltage V... IN The primary-side switching module 161, the resonant module 162, the secondary-side switching module 163, and the output voltage V o Connect them sequentially.

[0110] Furthermore, the primary-side module 161 includes a switch Q. 161 Switch Q 162 Switch Q 161 The first terminal is connected to the input voltage V IN The positive terminal, switch Q 161 The second end is connected to switch Q 162 The first terminal, switch Q 162 The second terminal is connected to the output voltage V o The first end.

[0111] Furthermore, the resonant module 162 includes a capacitor C. r161 Inductor L r161 Autotransformer T 16 Switch Q 161 The second terminal, capacitor C r161 Inductor L r161 Autotransformer T 16 Series connection.

[0112] Furthermore, the autotransformer T 16 Including winding N 161 Winding N 162 Winding N 163 Inductor L r161 Winding N 161 Winding N 162 Winding N 163 Series connection.

[0113] Furthermore, the secondary-side switch module 163 includes switch Q. 163 Switch Q 164 Switch Q 163 The first end is connected to winding N 162 The first terminal, switch Q 163 The second end is connected to switch Q 164 The second terminal and the output voltage V o The second terminal, switch Q 164 The first end is connected to winding N 163 The second end.

[0114] More specifically, the resonant converter circuit of the present invention further includes a capacitor C. I-O Capacitor C I-O Connected to switch Q 161 The first terminal and switch Q 162 Between the second terminals, capacitor C I-O This is the input filter circuit for the primary-side switching module 161.

[0115] More specifically, the resonant converter circuit of the present invention further includes a capacitor C. o Capacitor C o The first terminal is connected to the output voltage V o Capacitor C o The second terminal is grounded, serving as an output filter and energy storage unit.

[0116] More specifically, switch Q 161 and switch Q 162 Complementary conduction, duty cycle 0.5, switch Q 163 and switch Q 162 Simultaneously, switch Q is activated. 164 and switch Q 161 Simultaneous conduction. Autotransformer T 16 winding N 161 Winding N 162 Winding N 163 The turns ratios are n:1:1, and the voltage conversion ratio of the resonant converter circuit is (2n+3):1.

[0117] Figure 17 This is a circuit topology diagram of a tenth specific embodiment of a resonant converter circuit according to the present invention. Figure 17 As shown, the resonant converter circuit in this embodiment is obtained by connecting two sets of circuits from the ninth embodiment in parallel, and the two sets of circuits have the same topology. Among them, switch Q... 172 The second end is connected to switch Q 173 The first terminal, switch Q 174 The second terminal is connected to the output voltage V o The first terminal, switch Q 175 The second end is connected to switch Q176 The second end, switch Q 177 The second end, switch Q 178 The second terminal and the output voltage V o The second terminal, capacitor C I-O2 Parallel connection in switch Q 173 and switch Q 174 The two ends.

[0118] More specifically, switch Q 171 and switch Q 172 Complementary conduction, duty cycle 0.5, switch Q 172 and switch Q 175 Simultaneously, switch Q is activated. 171 and switch Q 176 Simultaneously activated; switch Q 173 and switch Q 174 Complementary conduction, duty cycle of 0.5, and switch Q 173 Delay switch Q 171 90-degree conduction, switch Q 174 Delay switch Q 172 90-degree conduction. Switch Q 174 and switch Q 177 Simultaneously, switch Q is activated. 173 and switch Q 178 Simultaneous conduction. Autotransformer T 171 winding N 171 Winding N 172 Winding N 173 The turns ratios are n:1:1, and the autotransformer T 172 winding N 174 Winding N 175 Winding N 176 The turns ratios are n:1:1, and the voltage conversion ratio of the resonant converter circuit is (4n+5):1.

[0119] Figure 18 This is a circuit topology diagram of an eleventh specific embodiment of a resonant converter circuit according to the present invention. Figure 18 As shown, a resonant converter circuit includes: a primary-side switching module 181, a resonant module 182, and a secondary-side switching module 183. The input voltage V... IN The primary-side switching module 181, the resonant module 182, the secondary-side switching module 183, and the output voltage V o Connect them sequentially.

[0120] Furthermore, the primary-side module 181 includes a switch Q. 181 Switch Q 182 Switch Q 181 The first terminal is connected to the input voltage V INThe positive terminal, switch Q 181 The second end is connected to switch Q 182 The first terminal, switch Q 182 The second terminal is connected to the output voltage V o The first end.

[0121] Furthermore, the resonant module 182 includes a capacitor C. r181 Inductor L r181 Autotransformer T 18 Switch Q 181 The second terminal, capacitor C r181 Inductor L r181 Autotransformer T 18 Series connection.

[0122] Furthermore, the autotransformer T 18 Including winding N 181 Winding N 182 Inductor L r181 Winding N 181 Winding N 182 Series connection.

[0123] Furthermore, the secondary-side switch module 183 includes switch Q. 183 Switch Q 184 Switch Q 185 Switch Q 186 Switch Q 183 The first end is connected to switch Q 185 The first terminal and the output voltage V o The first terminal, switch Q 183 The second end is connected to switch Q 184 The first end and winding N 181 The second terminal, switch Q 184 The second end is connected to switch Q 186 The second terminal and the output voltage V o The second terminal, switch Q 185 The second end is connected to switch Q 186 The first end and winding N 182 The second end.

[0124] More specifically, the resonant converter circuit of the present invention further includes a capacitor C. I-O Capacitor C I-O Connected to switch Q 181 The first terminal and switch Q 182 Between the second terminals, capacitor C I-O This is the input filter circuit for the primary-side switching module 181.

[0125] More specifically, the resonant converter circuit of the present invention further includes a capacitor C. oCapacitor C o The first terminal is connected to the output voltage V o Capacitor C o The second terminal is grounded, serving as an output filter and energy storage unit.

[0126] More specifically, switch Q 181 and switch Q 182 Complementary conduction, duty cycle 0.5, switch Q 181 Switch Q 183 and switch Q 186 Simultaneously, switch Q is activated. 182 Switch Q 184 and switch Q 185 Simultaneous conduction. Autotransformer T 18 winding N 181 Winding N 182 The turns ratios are n:1, and the voltage conversion ratio of this resonant converter circuit is 2(n+1):1.

[0127] Figure 19 This is a circuit topology diagram of a twelfth specific embodiment of a resonant converter circuit according to the present invention. Figure 19 As shown, the resonant converter circuit in this embodiment is obtained by connecting two sets of circuits from the eleventh embodiment in parallel, and the two sets of circuits have the same topology. Among them, switch Q... 198 The second terminal is connected to the output voltage V o The first terminal, switch Q 195 The first terminal and switch Q 1911 Connect the output voltage V o The first terminal, switch Q 196 The second end and switch Q 1912 The second terminal is connected to the output voltage V o The second terminal, capacitor C I-O2 Parallel connection in switch Q 197 and switch Q 198 The two ends.

[0128] More specifically, switch Q 191 and switch Q 192 Complementary conduction, duty cycle 0.5, switch Q 191 Switch Q 193 and switch Q 196 Simultaneously, switch Q is activated. 192 Switch Q 194 and switch Q 195 Simultaneously activated; switch Q 197 and switch Q 198 Complementary conduction, duty cycle 0.5, switch Q 197 and switch Q 198 Lagging behind switch Q 191 and switch Q192 90-degree conduction, switch Q 197 Switch Q 199 and switch Q 1912 Simultaneously, switch Q is activated. 198 Switch Q 1910 and switch Q 1911 Simultaneous conduction. Autotransformer T 191 winding N 191 Winding N 192 The turns ratios are n:1, and the autotransformer T 191 winding N 193 Winding N 194 The turns ratios are n:1, and the voltage conversion ratio of this resonant converter circuit is (4n+3):1.

[0129] Compared to the eleventh embodiment, the voltage stress on the primary-side MOSFET can be reduced and the output current ripple can be reduced by series interleaving.

[0130] Figure 20 This is a circuit topology diagram of a thirteenth specific embodiment of a resonant converter circuit according to the present invention. Figure 20 As shown, a resonant converter circuit includes: a primary-side switching module 201, a resonant module 202, and a secondary-side switching module 203. The input voltage V... IN The primary-side switching module 201, the resonant module 202, the secondary-side switching module 203, and the output voltage V o Connect them sequentially.

[0131] Furthermore, the primary-side module 201 includes a switch Q. 201 Switch Q 202 Switch Q 203 Switch Q 204 Switch Q 205 Switch Q 206 Switch Q 201 The first end is connected to switch Q 203 The first terminal, switch Q 205 The first terminal and the input voltage V IN The positive terminal, switch Q 201 The second end is connected to switch Q 202 The first terminal, switch Q 202 The second end is connected to switch Q 204 The second end, switch Q 206 The second terminal and the output voltage V o The first terminal, switch Q 203 The second end is connected to switch Q 204 The first terminal, switch Q 205 The second end is connected to switch Q 206 The first end.

[0132] Furthermore, the resonant module 202 includes a capacitor C. r201 Inductor L r201 Capacitor C r202 Inductor L r202 Capacitor C r203 Inductor L r203 Autotransformer T 201 Autotransformer T 202 Autotransformer T 203 Capacitor C r201 and inductor L r201 After being connected in series with the autotransformer T 201 The first end of the primary winding is connected; capacitor C r202 and inductor L r202 After being connected in series with the autotransformer T 202 The first end of the primary winding is connected; capacitor C r203 and inductor L r203 After being connected in series with the autotransformer T 203 The first end of the primary winding is connected; switch Q 201 and switch Q 202 Connect capacitor C at the midpoint of the connection. r201 Switch Q 203 and switch Q 204 Connect capacitor C at the midpoint of the connection. r202 Switch Q 205 and switch Q 206 Connect capacitor C at the midpoint of the connection. r203 .

[0133] Furthermore, the autotransformer T 201 The second end of the primary winding is connected to an autotransformer T. 201 The first end of the secondary winding; autotransformer T 202 The second end of the primary winding is connected to an autotransformer T. 202 The first end of the secondary winding; autotransformer T 203 The second end of the primary winding is connected to an autotransformer T. 203 The first end of the secondary winding.

[0134] Furthermore, the autotransformer T 201 Primary winding, autotransformer T 202 Primary winding, autotransformer T 203 The primary winding is connected in a star configuration; the autotransformer T 201 Secondary winding, autotransformer T 202 Secondary winding, autotransformer T 203 The secondary winding is connected in a star configuration; Furthermore, the secondary-side switch module 203 includes switch Q. 207Switch Q 208 Switch Q 209 Switch Q 2010 Switch Q 2011 Switch Q 2012 Switch Q 207 The first end is connected to switch Q 209 The first terminal, switch Q 2011 The first terminal and the output voltage V o The first terminal, switch Q 207 The second end is connected to switch Q 208 The first terminal, switch Q 208 The second end is connected to switch Q 2010 The second end, switch Q 2012 The second terminal and the output voltage V o The second terminal, switch Q 209 The second end is connected to switch Q 2010 The first terminal, switch Q 2011 The second end is connected to switch Q 2012 The first terminal, switch Q 207 and switch Q 208 Connect the autotransformer T at the midpoint of the connection. 201 The first terminal of the secondary winding, switch Q 209 and switch Q 2010 Connect the autotransformer T at the midpoint of the connection. 202 The first terminal of the secondary winding, switch Q 2011 and switch Q 2012 Connect the autotransformer T at the midpoint of the connection. 203 The first end of the secondary winding.

[0135] More specifically, the resonant converter circuit of the present invention further includes a capacitor C. I-O Capacitor C I-O Connected to switch Q 201 The first terminal and switch Q 202 Between the second terminals, capacitor C I-O This is the input filter circuit for the primary-side switching module 201.

[0136] More specifically, the resonant converter circuit of the present invention further includes a capacitor C. o Capacitor C o The first terminal is connected to the output voltage V o Capacitor C o The second terminal is grounded, serving as an output filter and energy storage unit.

[0137] More specifically, switch Q 201 and switch Q 202 Complementary conduction, switch Q 203 and switch Q 204 Complementary conduction, switch Q205 and switch Q 206 Complementary conduction, both with a duty cycle of 0.5, switch Q 207 and switch Q 201 Simultaneously, switch Q is activated. 208 and switch Q 202 Simultaneously, switch Q is activated. 209 and switch Q 203 Simultaneously, switch Q is activated. 2010 and switch Q 204 Simultaneously, switch Q is activated. 2011 and switch Q 205 Simultaneously, switch Q is activated. 2012 and switch Q 206 Simultaneous conduction. Autotransformer T 201 The primary winding to secondary winding turns ratio is n:1, autotransformer T 202 The primary winding to secondary winding turns ratio is n:1, autotransformer T 203 The turns ratio of the primary winding to the secondary winding is n:1, and the voltage conversion ratio of the resonant converter circuit is (n+2):1.

[0138] This embodiment can effectively reduce the effective value of the primary resonant cavity current and reduce copper losses; and at any given time, two sets of secondary windings share the output voltage, reducing the volt-second of the secondary windings and effectively reducing the design difficulty of the transformer.

[0139] Figure 21 This is a circuit topology diagram of the fourteenth specific embodiment of the resonant converter circuit of the present invention. The difference between this embodiment and the thirteenth specific embodiment is that the autotransformer T... 211 Secondary winding, autotransformer T 212 Secondary winding, autotransformer T 213 The secondary winding is connected in a delta configuration.

[0140] The other circuit topologies are the same, and will not be described in detail here.

[0141] More specifically, for the case where the resonant inductance is small and the resonant capacitance is large, switch Q... 211 and switch Q 212 Complementary conduction, Q 213 and Q 214 Complementary conduction, Q 215 and Q 216 Complementary conduction, both with a duty cycle of 0.5, Q 217 and Q 211 Simultaneously conduction, Q 218 and Q 212 Simultaneously conduction, Q 219 and Q 213 Simultaneously conduction, Q 2110 and Q214 Simultaneously conduction, Q 2111 and Q 215 Simultaneously conduction, Q 2112 and Q 216 Simultaneous conduction. Autotransformer T 211 The primary winding to secondary winding turns ratio is n:1, autotransformer T 212 The primary winding to secondary winding turns ratio is n:1, autotransformer T 213 The turns ratio of the primary winding to the secondary winding is n:1, and the voltage conversion ratio of the resonant converter circuit is (2n+2):1.

[0142] For cases where the resonant inductance is large and the resonant capacitance is small, the duty cycle of the primary-side switch needs to be reduced to around 0.3, while the switching timing and the on-time of the secondary-side switch remain unchanged.

[0143] This embodiment can effectively reduce the effective value of the primary resonant cavity current and reduce copper losses; it also reduces the volt-second of the secondary winding, effectively reducing the difficulty of transformer design.

[0144] This invention provides a resonant converter circuit that reduces the power transmitted through isolation conversion. This process reduces the effective value of the current flowing through the secondary winding, thereby reducing transformer winding losses; simultaneously, it also reduces the effective value of the current flowing through the rectifier diodes, effectively reducing rectifier diode conduction losses; furthermore, this circuit topology reduces the voltage stress on the primary-side switches. The secondary side employs a full-bridge rectifier, and the autotransformer winding design improves the winding structure of the non-isolation transformer, making the windings more symmetrical and reducing the voltage stress on the secondary-side switches. In addition, a clamping module is added to reduce the voltage stress on the first or second switch. A pre-charge module is added to charge the output voltage V... o After pre-charging to the normal operating voltage, the main power circuit starts working, which reduces the voltage stress on the primary side switching circuit. The resonant inductor can be designed independently or the leakage inductance of the transformer can be used as the resonant inductor, which can effectively reduce the effective value of the primary side resonant cavity current and reduce copper losses; it also reduces the volt-second of the secondary winding, effectively reducing the design difficulty of the transformer.

[0145] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A resonant converter circuit, characterized in that, It includes a primary-side switching module, a resonant module, and a secondary-side switching module; the primary-side switching module, the resonant module, and the secondary-side switching module are connected in sequence; the resonant module includes a first capacitor, a second capacitor, a first inductor, a second inductor, and a first autotransformer; the first capacitor, the first inductor, the first autotransformer, the second inductor, and the second capacitor are connected in series.

2. The resonant converter circuit as described in claim 1, characterized in that, The first autotransformer includes a first winding, a second winding, and a third winding, and the first inductor, the first winding, the second winding, the third winding, and the second inductor are connected in series.

3. The resonant converter circuit as described in claim 2, characterized in that, The turns ratio of the first winding, the second winding, and the third winding is n:1:n, and the turns ratio of the resonant converter circuit is (2n+2):

1.

4. The resonant converter circuit as described in claim 2, characterized in that, The secondary switch module includes a fifth switch, a sixth switch, a seventh switch, and an eighth switch; the first terminal of the fifth switch is connected to the first terminal of the output voltage, the second terminal of the fifth switch is connected to the first terminal of the seventh switch, the second terminal of the seventh switch is connected to the second terminal of the output voltage, the first terminal of the sixth switch is connected to the first terminal of the fifth switch, the second terminal of the sixth switch is connected to the first terminal of the eighth switch, and the second terminal of the eighth switch is connected to the second terminal of the seventh switch; the midpoint of the connection between the first winding and the second winding is connected to the midpoint of the connection between the fifth switch and the seventh switch, and the midpoint of the connection between the second winding and the third winding is connected to the midpoint of the connection between the sixth switch and the eighth switch.

5. The resonant converter circuit as described in claim 1, characterized in that, The first autotransformer includes a fourth winding, a fifth winding, a sixth winding, and a seventh winding, and the first inductor, the fourth winding, the fifth winding, the sixth winding, the seventh winding, and the second inductor are connected in series.

6. The resonant converter circuit as described in claim 5, characterized in that, The turns ratio of the fourth, fifth, sixth, and seventh windings is n:1:1:n, and the turns ratio of the resonant converter circuit is (2n+3):

1.

7. The resonant converter circuit as described in claim 5, characterized in that, The secondary switch module includes a ninth switch and a tenth switch. The first end of the ninth switch is connected to the midpoint of the connection between the fourth winding and the fifth winding, and the second end of the ninth switch is connected to the second end of the output voltage. The first end of the tenth switch is connected to the midpoint of the connection between the sixth winding and the seventh winding, and the second end of the tenth switch is connected to the second end of the output voltage. The fifth winding and the sixth winding are connected to the first end of the output voltage.

8. The resonant converter circuit as described in claim 1, characterized in that, The primary-side switch module includes a first switch, a second switch, a third switch, and a fourth switch; the first terminal of the first switch is connected to the positive terminal of the input voltage, the second terminal of the first switch is connected to the first terminal of the third switch, the first terminal of the second switch is connected to the first terminal of the first switch, the second terminal of the second switch is connected to the first terminal of the fourth switch, the second terminal of the fourth switch is connected to the second terminal of the third switch, and the second terminals of the third and fourth switches are connected to the first terminal of the output voltage.

9. The resonant converter circuit as described in claim 8, characterized in that, It also includes a clamping module, which is connected to the primary-side switch module.

10. A resonant converter circuit as described in claim 9, characterized in that, The clamping module includes a third capacitor, a first diode, and a second diode; the first terminal of the third capacitor is connected to the positive terminal of the input voltage, the second terminal of the third capacitor is connected to the anode of the first diode, the cathode of the first diode is connected to the second terminal of the first switch, the anode of the second diode is connected to the second terminal of the third capacitor, and the cathode of the second diode is connected to the first terminal of the fourth switch.

11. The resonant converter circuit as described in claim 10, characterized in that, It also includes a pre-charging module, the first terminal of which is connected to the positive terminal of the input voltage, and the second terminal of which is connected to the first terminal of the output voltage.

12. The resonant converter circuit as described in claim 7, characterized in that, It also includes a third inductor and a fourth inductor. The first end of the third inductor is connected to the second end of the first capacitor, the second end of the third inductor is connected to the first end of the first inductor, the first end of the fourth inductor is connected to the first end of the second inductor, and the second end of the fourth inductor is connected to the second end of the second capacitor. At this time, the primary-side switch and the secondary-side switch are located on the same side of the magnetic core of the first autotransformer.

13. The resonant converter circuit as described in claim 7, characterized in that, It also includes a fifth inductor and a sixth inductor. The first end of the fifth inductor is connected to the second end of the third switch and the fourth switch. The second end of the fifth inductor is connected to the first end of the output voltage. The first end of the sixth inductor is connected to the positive terminal of the input voltage. The second end of the sixth inductor is connected to the first end of the first switch and the second switch. At this time, the primary switch and the secondary switch are located on both sides of the magnetic core of the first autotransformer.

14. A resonant converter circuit, characterized in that, It includes a primary-side switch module, a resonant module, and a secondary-side switch module; the primary-side switch module, the resonant module, and the secondary-side switch module are connected in sequence; the resonant module includes a fourth capacitor, a seventh inductor, and a second autotransformer; the second terminal of the eleventh switch, the fourth capacitor, the seventh inductor, and the second autotransformer are connected in series; the second autotransformer includes an eighth winding, a ninth winding, and a tenth winding, and the seventh inductor, the eighth winding, the ninth winding, and the tenth winding are connected in series; The first end of the thirteenth switch is connected to the first end of the ninth winding, and the first end of the fourteenth switch is connected to the second end of the tenth winding. The turns ratios of the eighth, ninth, and tenth windings of the second autotransformer are n:1:1, and the voltage conversion ratio of the resonant converter circuit is (2n+3):

1.

15. A resonant converter circuit as described in claim 14, characterized in that, The resonant module further includes a fifth capacitor, an eighth inductor, and a third autotransformer. The second terminal of the fifteenth switch, the fifth capacitor, the eighth inductor, and the third autotransformer are connected in series. The third autotransformer includes an eleventh winding, a twelfth winding, and a thirteenth winding. The eighth inductor, the eleventh winding, the twelfth winding, and the thirteenth winding are connected in series. The first terminal of the seventeenth switch is connected to the first terminal of the twelfth winding, and the first terminal of the eighteenth switch is connected to the second terminal of the thirteenth winding. The turns ratios of the eleventh, twelfth, and thirteenth windings of the third autotransformer are n:1:1, and the voltage conversion ratio of the resonant converter circuit is (4n+5):

1.

16. A resonant converter circuit, characterized in that, It includes a primary-side switching module, a resonant module, and a secondary-side switching module; the primary-side switching module, the resonant module, and the secondary-side switching module are connected in sequence; the resonant module includes a sixth capacitor, a ninth inductor, and a fourth autotransformer; the second terminal of the nineteenth switch, the sixth capacitor, the ninth inductor, and the fourth autotransformer are connected in series; the fourth autotransformer includes a fourteenth winding and a fifteenth winding, and the ninth inductor, the fourteenth winding, and the fifteenth winding are connected in series; the second terminal of the twenty-first switch is connected to the second terminal of the fourteenth winding, and the second terminal of the twenty-third switch is connected to the second terminal of the fifteenth winding; The turns ratio of the fourteenth and fifteenth windings of the fourth autotransformer is n:1, and the voltage conversion ratio of the resonant converter circuit is 2(n+1):

1.

17. A resonant converter circuit as described in claim 16, characterized in that, The resonant module further includes a seventh capacitor, a tenth inductor, and a fifth autotransformer. The second terminal of the twenty-fifth switch, the seventh capacitor, the tenth inductor, and the fifth autotransformer are connected in series. The fifth autotransformer includes a sixteenth winding and a seventeenth winding. The tenth inductor, the sixteenth winding, and the seventeenth winding are connected in series. The second terminal of the twenty-seventh switch is connected to the second terminal of the sixteenth winding, and the second terminal of the twenty-ninth switch is connected to the second terminal of the seventeenth winding. The turns ratio of the sixteenth and seventeenth windings of the fifth autotransformer is n:1, and the voltage conversion ratio of the resonant converter circuit is (4n+3):

1.

18. A resonant converter circuit, characterized in that, The system includes a primary-side switching module, a resonant module, and a secondary-side switching module; these modules are connected sequentially. The resonant module comprises an eighth capacitor, an eleventh inductor, a ninth capacitor, a twelfth inductor, a tenth capacitor, a thirteenth inductor, a sixth autotransformer, a seventh autotransformer, and an eighth autotransformer. The eighth capacitor and the eleventh inductor are connected in series to the first end of the primary winding of the sixth autotransformer; the ninth capacitor and the twelfth inductor are connected in series to the first end of the primary winding of the seventh autotransformer; the tenth capacitor and the thirteenth inductor are connected in series to the first end of the primary winding of the eighth autotransformer; the midpoint between the thirty-first and thirty-second switches is connected to the eighth capacitor; the midpoint between the thirty-third and thirty-fourth switches is connected to the ninth capacitor; and the midpoint between the thirty-fifth and thirty-sixth switches is connected to the tenth capacitor. The second end of the primary winding of the sixth autotransformer is connected to the first end of the secondary winding of the sixth autotransformer; the second end of the primary winding of the seventh autotransformer is connected to the first end of the secondary winding of the seventh autotransformer; the second end of the primary winding of the eighth autotransformer is connected to the first end of the secondary winding of the eighth autotransformer.

19. A resonant converter circuit as described in claim 18, characterized in that, The secondary windings of the sixth autotransformer, the seventh autotransformer, and the eighth autotransformer are connected in a star configuration. The turns ratio of the primary winding to the secondary winding of the sixth autotransformer is n:1, the turns ratio of the primary winding to the secondary winding of the seventh autotransformer is n:1, the turns ratio of the primary winding to the secondary winding of the eighth autotransformer is n:1, and the voltage conversion ratio of the resonant converter circuit is (n+2):

1.

20. A resonant converter circuit as described in claim 18, characterized in that, The secondary windings of the ninth autotransformer, the tenth autotransformer, and the eleventh autotransformer are connected in a delta configuration. The turns ratio of the primary winding to the secondary winding of the ninth autotransformer is n:1, the turns ratio of the primary winding to the secondary winding of the tenth autotransformer is n:1, the turns ratio of the primary winding to the secondary winding of the eleventh autotransformer is n:1, and the voltage conversion ratio of the resonant converter circuit is (2n+2):1.

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