Synchronous rectification commutation circuit and synchronous rectification commutator

Abstract

The utility model relates to industrial application power supply technical field discloses a kind of synchronous rectification commutation circuit and synchronous rectification commutator, the circuit includes: transformer, the transformer includes primary winding and two groups of secondary winding;First rectification commutation switch module, the first rectification commutation switch module is connected with two secondary windings and first output respectively, for receiving first group control signal to open or shut off;Second rectification commutation switch module, the second rectification commutation switch module is connected with two secondary windings and second output respectively, for receiving second group control signal to open or shut off;Control module, the control module is used to output first group control signal and second group control signal, to control rectification and the commutation of output signal.Solve the problem of more commutation elements based on electronic semiconductor, high cost.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology for industrial applications, specifically to synchronous rectification commutation circuits and synchronous rectification commutators. Background Technology

[0002] Mechanical commutation involves mechanical movement, resulting in a long commutation time, low commutation frequency, and short lifespan. To address this issue, electronic commutation typically uses electronic semiconductors, such as thyristors, MOSFETs, transistors, and IGBTs, to replace mechanical switches and reverse the positive and negative terminals of the power supply.

[0003] However, commutation components based on electronic semiconductors are numerous and costly, especially when power supplies require high current output. Utility Model Content

[0004] This invention provides a synchronous rectification commutation circuit and a synchronous rectification commutator to solve the problem of high cost and large number of commutation elements based on electronic semiconductors.

[0005] In a first aspect, this utility model provides a synchronous rectification and commutation circuit, the circuit comprising: A transformer, comprising a primary winding and two sets of secondary windings; The first rectifier commutation switch module is connected to two secondary windings and a first output terminal respectively, and is used to receive a first set of control signals to turn on or off. The second rectifier commutator module is connected to two secondary windings and a second output terminal respectively, and is used to receive a second set of control signals to turn on or off. The control module is used to output a first set of control signals and a second set of control signals to control rectification and commutation of the output signals.

[0006] In one optional implementation, the two secondary windings are a first secondary winding and a second secondary winding, respectively. The first rectifier commutation switch module includes: The first switching transistor has a first end connected to the same-name end of the first secondary winding, a second end connected to the first output end, and a control end connected to the control module. The fourth switch has its first end connected to the opposite end of the second secondary winding, its second end connected to the first output end, and its control end connected to the control module.

[0007] In one optional implementation, the second rectifier commutation switch module includes: The second switch has a first end connected to the opposite end of the first secondary winding, a second end connected to the negative second output terminal, and a control terminal connected to the control module. The third switch has its first end connected to the same-name end of the second secondary winding, its second end connected to the second output end, and its control end connected to the control module.

[0008] In one optional implementation, the second set of control signals includes a second set of on signals; When the first output terminal outputs a positive terminal and the second output terminal outputs a negative terminal, the control module outputs a second set of conduction signals and a first set of control signals synchronized with the voltage direction of the primary winding. The first switch and the fourth switch are alternately turned on after receiving the first set of control signals; The second and third switching transistors turn on after receiving the second set of turn-on signals.

[0009] In one optional implementation, the first set of control signals includes a first turn-on signal, a first turn-off signal, a fourth turn-on signal, and a fourth turn-off signal; When the secondary winding changes from a negative half-wave to a positive half-wave, the control module outputs a first turn-on signal and a fourth turn-off signal. The first switch is turned on after receiving the first turn-on signal, and the fourth switch is turned off after receiving the fourth turn-off signal. When the secondary winding changes from a positive half-wave to a negative half-wave, the control module outputs a fourth turn-on signal and a first turn-off signal. The first switch turns off after receiving the first turn-off signal, and the fourth switch turns on after receiving the fourth turn-on signal.

[0010] In one alternative implementation, the first set of control signals includes a first set of on signals; When the first output terminal outputs a negative terminal and the second output terminal outputs a positive terminal, the control module outputs a first set of conduction signals and a second set of control signals synchronized with the voltage direction of the primary winding. The first switch and the fourth switch are turned on after receiving the first set of turn-on signals; The second and third switching transistors are turned on alternately after receiving the second set of control signals.

[0011] In one optional implementation, the second set of control signals includes a second turn-on signal, a second turn-off signal, a third turn-on signal, and a third turn-off signal; When the secondary winding changes from a negative half-wave to a positive half-wave, the control module outputs a second turn-off signal and a third turn-on signal. The third switch is turned on after receiving the third turn-on signal, and the second switch is turned off after receiving the second turn-off signal. When the secondary winding changes from a positive half-wave to a negative half-wave, the control module outputs a second turn-on signal and a third turn-off signal. The third switch is turned off after receiving the third turn-off signal, and the second switch is turned on after receiving the second turn-on signal.

[0012] In one optional implementation, the first set of control signals includes a first signal and a fourth signal; the second set of control signals includes a second signal and a third signal. The first output terminal outputs a positive terminal and the second output terminal outputs a negative terminal. When the secondary winding changes from a negative half-wave to a positive half-wave, the first switch receives a first signal and turns on, the second switch receives a second signal and turns on, the third switch receives a third signal and turns off, and the fourth switch receives a fourth signal and turns off. When the secondary winding changes from a positive half-wave to a negative half-wave, the first switch receives a first signal and turns off, the second switch receives a second signal and turns off, the third switch receives a third signal and turns on, and the fourth switch receives a fourth signal and turns on.

[0013] In one optional implementation, the first set of control signals includes a fifth signal and an eighth signal; the second set of control signals includes a sixth signal and a seventh signal. The first output terminal outputs a negative terminal and the second output terminal outputs a positive terminal. When the secondary winding changes from a negative half-wave to a positive half-wave, the first switch receives a fifth signal and turns off, the second switch receives a sixth signal and turns off, the third switch receives a seventh signal and turns on, and the fourth switch receives an eighth signal and turns on. When the secondary winding changes from a positive half-wave to a negative half-wave, the first switch receives the fifth signal and turns on, the second switch receives the sixth signal and turns on, the third switch receives the seventh signal and turns off, and the fourth switch receives the eighth signal and turns off.

[0014] Secondly, this utility model provides a synchronous rectifier commutator, which includes the synchronous rectifier commutator circuit described above. The transformer, the first rectifier commutator module, and the second rectifier commutator module are arranged in a preset manner. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a synchronous rectification and commutation circuit according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of another synchronous rectification and commutation circuit according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the structure of another synchronous rectification and commutation circuit according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of a synchronous rectifier commutator structure according to an embodiment of the present utility model. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] It is understood that before using the technical solutions disclosed in the various embodiments of this utility model, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in this utility model in an appropriate manner in accordance with relevant laws and regulations, and user authorization should be obtained.

[0019] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] Mechanical commutation involves mechanical movement, resulting in a long commutation time, low commutation frequency, and short lifespan. To address this, electronic commutation typically uses semiconductors such as thyristors, MOSFETs, transistors, and IGBTs to replace mechanical switches and reverse the positive and negative terminals of the power supply. Some related technologies employ two sets of MOSFETs connected in reverse, either with their drains or sources connected. However, this extends the output line, increasing line losses. Furthermore, the two sets of reverse-connected MOSFETs are prone to mutual interference, especially when the power supply requires high current output, leading to a high failure rate.

[0021] However, commutation components based on electronic semiconductors are numerous and costly, especially when power supplies require high current output.

[0022] This embodiment provides a synchronous rectification and commutation circuit, such as Figure 1 As shown, the circuit includes: Transformer 10, which includes a primary winding and at least two sets of secondary windings; At least one first rectifier commutation switch module 20, the first rectifier commutation switch module 20 is connected to two secondary windings and a first output terminal respectively, and is used to receive a first set of control signals to turn on or off; At least one second rectifier commutation switch module 30, the second rectifier commutation switch module 30 is connected to two secondary windings and a second output terminal respectively, and is used to receive a second set of control signals to turn on or off; The control module is used to output a first set of control signals and a second set of control signals to control rectification and commutation of the output signals.

[0023] Optionally, energy is transferred from the primary winding to the secondary winding, with the two secondary windings being N1 and N2, respectively. The terminals of the secondary windings with the same name are marked with a "●". The first rectifier commutator module 20 and the second rectifier commutator module 30 are switch combinations.

[0024] Optionally, the control module is used to control the on or off of the first rectifier commutation switch module 20 and the second rectifier commutation switch module 30.

[0025] It is worth noting that additional secondary windings, additional first rectifier commutator switch modules 20 or additional second rectifier commutator switch modules 30 can be added. The additional first rectifier commutator switch modules 20 and the first rectifier commutator switch module 20 are connected in parallel, and the additional second rectifier commutator switch modules 30 and the second rectifier commutator switch module 30 are connected in parallel.

[0026] The synchronous rectification and commutation circuit provided in this application, through the control module controlling the first rectification and commutation switch module 20 and the second rectification and commutation switch module 30, rectifies the AC voltage transmitted by the transformer 10 into DC voltage while controlling the output direction of the first and second output terminals. Therefore, compared to traditional methods that require different components to achieve rectification and output signal commutation, this application only needs to control the switch modules, enabling simultaneous rectification and commutation, greatly reducing the number of components and thus reducing costs.

[0027] In some alternative implementations, such as Figure 1 As shown, the two secondary windings are the first secondary winding N1 and the second secondary winding N2, respectively. The first rectifier commutation switch module 20 includes: The first switch Q1 has its first end connected to the same-name end of the first secondary winding N1, its second end connected to the first output terminal L1, and its control terminal connected to the control module. The fourth switch Q4 has its first end connected to the opposite end of the second secondary winding N2, its second end connected to the first output end, and its control end connected to the control module.

[0028] Optionally, the first switch Q1 and the fourth switch Q4 are NMOS (Negative channel-Metal-Oxide-Semiconductor) transistors. Of course, the first switch Q1 and the fourth switch Q4 can be PMOS (positive channel Metal Oxide Semiconductor) transistors. When using NMOS transistors, they can withstand high power.

[0029] In some alternative implementations, such as Figure 1 As shown, the second rectifier commutation switch module 30 includes: The second switch Q2 has its first end connected to the opposite end of the first secondary winding N1, its second end connected to the negative second output terminal L2, and its control terminal connected to the control module. The third switch Q3 has its first end connected to the same-name end of the second secondary winding N2, its second end connected to the second output terminal L2, and its control terminal connected to the control module.

[0030] Optionally, the second switch Q2 and the third switch Q3 are NMOS (Negative channel-Metal-Oxide-Semiconductor) transistors. Of course, the second switch Q2 and the third switch Q3 can be PMOS (positive channel Metal Oxide Semiconductor) transistors. When using NMOS transistors, they can withstand high power.

[0031] In some alternative implementations, such as Figure 2 As shown, the second set of control signals includes the second set of conduction signals; When the first output terminal L1 outputs a positive terminal and the second output terminal L2 outputs a negative terminal, the control module outputs a second set of conduction signals and a first set of control signals synchronized with the voltage direction of the primary winding. The first switch Q1 and the fourth switch Q4 are turned on alternately after receiving the first set of control signals; The second switch Q2 and the third switch Q3 are turned on after receiving the second set of turn-on signals.

[0032] Specifically, refer to Figure 2 When the AC voltage of the transformer is converted to DC voltage and the first output terminal L1 outputs a positive terminal and the second output terminal L2 outputs a negative terminal, the second rectifier commutation switch module 30 is controlled to be continuously turned on, and the first switch Q1 and the fourth switch Q4 are controlled to operate in synchronous rectification mode. Synchronous rectification refers to operation synchronized with the operation mode of the transformer's primary winding.

[0033] In some alternative implementations, such as Figure 2 As shown, the first set of control signals includes a first turn-on signal, a first turn-off signal, a fourth turn-on signal, and a fourth turn-off signal; When the secondary winding changes from a negative half-wave to a positive half-wave, the control module outputs a first turn-on signal and a fourth turn-off signal. The first switch Q1 turns on after receiving the first turn-on signal, and the fourth switch Q4 turns off after receiving the fourth turn-off signal. When the secondary winding changes from a positive half-wave to a negative half-wave, the control module outputs a fourth turn-on signal and a first turn-off signal. The first switch Q1 turns off after receiving the first turn-off signal, and the fourth switch Q4 turns on after receiving the fourth turn-on signal.

[0034] Specifically, based on the switching between the positive and negative half-waves of the secondary winding, when the voltage at the output terminal of the transformer's secondary side changes from the negative half-wave to the positive half-wave, the terminals of the first secondary winding N1 and the second secondary winding N2 are positive. At this time, the first switch Q1 is turned on and the fourth switch Q4 is turned off, while the second switch Q2 and the third switch Q3 remain on. When the voltage at the output terminal of the transformer's secondary side changes from the positive half-wave to the negative half-wave, the terminals of the first secondary winding N1 and the second secondary winding N2 are negative. At this time, the fourth switch Q4 is turned on and the first switch Q1 is turned off, while the second switch Q2 and the third switch Q3 remain on.

[0035] In some alternative implementations, such as Figure 3 As shown, the first set of control signals includes the first set of conduction signals; When the first output terminal outputs a negative terminal and the second output terminal outputs a positive terminal, the control module outputs a first set of conduction signals and a second set of control signals synchronized with the voltage direction of the primary winding. The first switch Q1 and the fourth switch Q4 are turned on after receiving the first set of turn-on signals; The second switch Q2 and the third switch Q3 are turned on alternately after receiving the second set of control signals.

[0036] Specifically, refer to Figure 3 When the AC voltage of the transformer is converted to DC voltage and the first output terminal L1 outputs the negative terminal and the second output terminal L2 outputs the positive terminal, the first rectifier commutation switch module 20 is controlled to be continuously turned on, while the second switch Q2 and the third switch Q3 are controlled to operate in synchronous rectification mode. Synchronous rectification refers to operation synchronized with the primary winding of the transformer.

[0037] In some alternative implementations, such as Figure 3 As shown, the second set of control signals includes a second turn-on signal, a second turn-off signal, a third turn-on signal, and a third turn-off signal; When the secondary winding changes from a negative half-wave to a positive half-wave, the control module outputs a second turn-off signal and a third turn-on signal. The third switch Q3 turns on after receiving the third turn-on signal, and the second switch Q2 turns off after receiving the second turn-off signal. When the secondary winding changes from a positive half-wave to a negative half-wave, the control module outputs a second turn-on signal and a third turn-off signal. The third switch Q3 turns off after receiving the third turn-off signal, and the second switch Q2 turns on after receiving the second turn-on signal.

[0038] Specifically, based on the switching between the positive and negative half-waves of the secondary winding, when the voltage at the output terminal of the transformer's secondary side changes from the negative half-wave to the positive half-wave, the terminals of the transformer's first secondary winding N1 and the second secondary winding N2 are positive, controlling the third switch Q3 to turn on and the second switch Q2 to turn off. When the voltage at the output terminal of the transformer's secondary side changes from the positive half-wave to the negative half-wave, the terminals of the transformer's first secondary winding N1 and the second secondary winding N2 are negative, controlling the second switch Q2 to turn on and the third switch Q3 to turn off.

[0039] In some alternative implementations, such as Figure 1 As shown, the first set of control signals includes a first signal and a fourth signal; the second set of control signals includes a second signal and a third signal. The first output terminal outputs a positive terminal and the second output terminal outputs a negative terminal. When the secondary winding changes from a negative half-wave to a positive half-wave, the first switch Q1 receives a first signal and turns on, the second switch Q2 receives a second signal and turns on, the third switch Q3 receives a third signal and turns off, and the fourth switch Q4 receives a fourth signal and turns off. When the secondary winding changes from a positive half-wave to a negative half-wave, the first switch Q1 receives a first signal and turns off, the second switch Q2 receives a second signal and turns off, the third switch Q3 receives a third signal and turns on, and the fourth switch Q4 receives a fourth signal and turns on.

[0040] Specifically, a second rectification and commutation control method is provided, where the first output terminal outputs a positive terminal and the second output terminal outputs a negative terminal. When the secondary winding switches from a negative half-wave to a positive half-wave, the corresponding terminals of the first secondary winding N1 and the second secondary winding N2 of the transformer are positive. At this time, the first switch Q1 and the second switch Q2 are simultaneously turned on, while the third switch Q3 and the fourth switch Q4 are turned off. When the secondary winding switches from a positive half-wave to a negative half-wave, the corresponding terminals of the first secondary winding N1 and the second secondary winding N2 of the transformer are negative. At this time, the third switch Q3 and the fourth switch Q4 are simultaneously turned on, while the first switch Q1 and the second switch Q2 are turned off.

[0041] In some alternative implementations, such as Figure 1 As shown, the first set of control signals includes: the fifth signal and the eighth signal; the second set of control signals includes: the sixth signal and the seventh signal; The first output terminal outputs a negative terminal and the second output terminal outputs a positive terminal. When the secondary winding changes from a negative half-wave to a positive half-wave, the first switch Q1 receives a fifth signal and turns off, the second switch Q2 receives a sixth signal and turns off, the third switch Q3 receives a seventh signal and turns on, and the fourth switch Q4 receives an eighth signal and turns on. When the secondary winding changes from a positive half-wave to a negative half-wave, the first switch Q1 receives the fifth signal and turns on, the second switch Q2 receives the sixth signal and turns on, the third switch Q3 receives the seventh signal and turns off, and the fourth switch Q4 receives the eighth signal and turns off.

[0042] Specifically, a second rectification and commutation control method is provided, where the first output terminal outputs a negative terminal and the second output terminal outputs a positive terminal. When the secondary winding switches from a negative half-wave to a positive half-wave, the corresponding terminals of the first secondary winding N1 and the second secondary winding N2 of the transformer are positive. At this time, the third switch Q3 and the fourth switch Q4 are turned on, and the first switch Q1 and the second switch Q2 are turned off simultaneously. When the secondary winding switches from a positive half-wave to a negative half-wave, the corresponding terminals of the first secondary winding N1 and the second secondary winding N2 of the transformer are negative. At this time, the first switch Q1 and the second switch Q2 are turned on, and the third switch Q3 and the fourth switch Q4 are turned off simultaneously.

[0043] This embodiment provides a synchronous rectifier commutator, such as Figure 4 As shown, the synchronous rectifier commutator includes the synchronous rectifier commutation circuit described above. The transformer, the first rectifier commutator module, and the second rectifier commutator module are arranged in a preset manner.

[0044] refer to Figure 4 , Figure 4 In this circuit, 1 is the same-name terminal of the first secondary winding N1 of the transformer, 2 is the first switching transistor Q1, 3 is the first output terminal L1, 4 is the fourth switching transistor Q4, 5 is the opposite-name terminal of the second secondary winding N2 of the transformer, 6 is the transformer housing, 7 is the same-name terminal of the second secondary winding N2 of the transformer, 8 is the third switching transistor Q3, 9 is the second output terminal L2, 10 is the second switching transistor Q2, and 11 is the opposite-name terminal of the first secondary winding N1 of the transformer. This layout shortens the output lines, simplifies the structure, provides excellent anti-interference performance, and significantly reduces the power supply failure rate.

[0045] Specifically, the same-name terminals and opposite-name terminals of the first secondary winding N1 are arranged diagonally relative to the transformer casing, and the same-name terminals and opposite-name terminals of the second secondary winding N2 are arranged diagonally relative to the transformer casing. The first switch Q1 and the second switch Q2 are arranged diagonally relative to the transformer casing, and the third switch Q3 and the fourth switch Q4 are also arranged diagonally relative to the transformer casing.

[0046] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A synchronous rectification commutation circuit, characterized in that, The circuit includes: A transformer, comprising a primary winding and two sets of secondary windings; The first rectifier commutation switch module is connected to two secondary windings and a first output terminal respectively, and is used to receive a first set of control signals to turn on or off. The second rectifier commutator module is connected to two secondary windings and a second output terminal respectively, and is used to receive a second set of control signals to turn on or off. The control module is used to output a first set of control signals and a second set of control signals to control rectification and commutation of the output signals.

2. The synchronous rectification and commutation circuit according to claim 1, characterized in that, The two secondary windings are the first secondary winding and the second secondary winding, respectively. The first rectifier commutation switch module includes: The first switching transistor has a first end connected to the same-name end of the first secondary winding, a second end connected to the first output end, and a control end connected to the control module. The fourth switch has its first end connected to the opposite end of the second secondary winding, its second end connected to the first output end, and its control end connected to the control module.

3. The synchronous rectification and commutation circuit according to claim 2, characterized in that, The second rectifier commutation switch module includes: The second switch has a first end connected to the opposite end of the first secondary winding, a second end connected to the negative second output terminal, and a control terminal connected to the control module. The third switch has its first end connected to the same-name end of the second secondary winding, its second end connected to the second output end, and its control end connected to the control module.

4. The synchronous rectification and commutation circuit according to claim 3, characterized in that, The second set of control signals includes the second set of conduction signals; When the first output terminal outputs a positive terminal and the second output terminal outputs a negative terminal, the control module outputs a second set of conduction signals and a first set of control signals synchronized with the voltage direction of the primary winding. The first switch and the fourth switch are alternately turned on after receiving the first set of control signals; The second and third switching transistors turn on after receiving the second set of turn-on signals.

5. The synchronous rectification and commutation circuit according to claim 4, characterized in that, The first set of control signals includes a first turn-on signal, a first turn-off signal, a fourth turn-on signal, and a fourth turn-off signal; When the secondary winding changes from a negative half-wave to a positive half-wave, the control module outputs a first turn-on signal and a fourth turn-off signal. The first switch is turned on after receiving the first turn-on signal, and the fourth switch is turned off after receiving the fourth turn-off signal. When the secondary winding changes from a positive half-wave to a negative half-wave, the control module outputs a fourth turn-on signal and a first turn-off signal. The first switch turns off after receiving the first turn-off signal, and the fourth switch turns on after receiving the fourth turn-on signal.

6. The synchronous rectification and commutation circuit according to claim 4, characterized in that, The first set of control signals includes the first set of conduction signals; When the first output terminal outputs a negative terminal and the second output terminal outputs a positive terminal, the control module outputs a first set of conduction signals and a second set of control signals synchronized with the voltage direction of the primary winding. The first switch and the fourth switch are turned on after receiving the first set of turn-on signals; The second and third switching transistors are turned on alternately after receiving the second set of control signals.

7. The synchronous rectification and commutation circuit according to claim 6, characterized in that, The second set of control signals includes a second turn-on signal, a second turn-off signal, a third turn-on signal, and a third turn-off signal; When the secondary winding changes from a negative half-wave to a positive half-wave, the control module outputs a second turn-off signal and a third turn-on signal. The third switch is turned on after receiving the third turn-on signal, and the second switch is turned off after receiving the second turn-off signal. When the secondary winding changes from a positive half-wave to a negative half-wave, the control module outputs a second turn-on signal and a third turn-off signal. The third switch is turned off after receiving the third turn-off signal, and the second switch is turned on after receiving the second turn-on signal.

8. The synchronous rectification and commutation circuit according to claim 3, characterized in that, The first set of control signals includes a first signal and a fourth signal; the second set of control signals includes a second signal and a third signal. The first output terminal outputs a positive terminal and the second output terminal outputs a negative terminal. When the secondary winding changes from a negative half-wave to a positive half-wave, the first switch receives a first signal and turns on, the second switch receives a second signal and turns on, the third switch receives a third signal and turns off, and the fourth switch receives a fourth signal and turns off. When the secondary winding changes from a positive half-wave to a negative half-wave, the first switch receives a first signal and turns off, the second switch receives a second signal and turns off, the third switch receives a third signal and turns on, and the fourth switch receives a fourth signal and turns on.

9. The synchronous rectification and commutation circuit according to claim 3, characterized in that, The first set of control signals includes: the fifth signal and the eighth signal; the second set of control signals includes: the sixth signal and the seventh signal; The first output terminal outputs a negative terminal and the second output terminal outputs a positive terminal. When the secondary winding changes from a negative half-wave to a positive half-wave, the first switch receives a fifth signal and turns off, the second switch receives a sixth signal and turns off, the third switch receives a seventh signal and turns on, and the fourth switch receives an eighth signal and turns on. When the secondary winding changes from a positive half-wave to a negative half-wave, the first switch receives the fifth signal and turns on, the second switch receives the sixth signal and turns on, the third switch receives the seventh signal and turns off, and the fourth switch receives the eighth signal and turns off.

10. A synchronous rectifier commutator, characterized in that, The synchronous commutator includes the synchronous commutator circuit as described in any one of claims 1 to 9; The transformer, the first rectifier commutator module, and the second rectifier commutator module are arranged in a preset manner.

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