Flyback multipath isolation power supply and frequency converter
By setting up M second transformers in the flyback multi-isolated power supply, the number of secondary windings of the first transformer is reduced, and the problems of high design costs and low layout flexibility in the prior art are solved, thus achieving lower cost and More flexible multi-channel isolation power supply design.
Patent Information
- Application Number
- CN202420513478.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-15
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-03-15
AI Technical Summary
In the prior art, the design cost of flyback multi-isolated power supply is high and the layout flexibility on the circuit board is low.
By setting M second transformers in the rear stage of the first transformer, the number of settings of the first transformer secondary windings is reduced, and the secondary windings of the M second transformers share all the original needs to be arranged on the secondary side of the first transformer Winding.
The core volume of the main power transformer in the flyback multi-isolated power supply is reduced, the space occupied on the circuit board is reduced, the layout flexibility is improved, and the design cost is significantly reduced.
Smart Images
Figure CN222509123U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of frequency converters, in particular to a flyback multi-channel isolation power supply and a frequency converter. Background Art
[0002] Currently, if it is necessary to set up multiple isolated power supplies in the inverter, one method is to use a flyback transformer with multiple windings to provide multiple isolated power supplies for the inverter, and another method is to provide multiple isolated power supplies for the inverter by purchasing a separate isolated power supply module.
[0003] See also Figure 1 , Figure 1 FIG. 1 is a structural diagram of a flyback multi-channel isolated power supply in the prior art. Figure 1 In the invention, since the output of the flyback multi-channel isolated power supply is provided by the windings set on the secondary side of the main power transformer T0, if several isolated power supplies are needed in the frequency converter, a corresponding number of windings need to be set on the secondary side of the main power transformer T0, which will make the magnetic core volume of the main power transformer T0 larger, and cause the flyback multi-channel isolated power supply to occupy a large amount of space on the circuit board, thereby reducing the layout flexibility of the flyback multi-channel isolated power supply on the circuit board. If a separate isolated power supply module is purchased to provide a multi-channel isolated power supply for the frequency converter, although this method can improve the layout flexibility of the multi-channel isolated power supply on the circuit board, the cost of the isolated power supply module is high. A large number of isolated power supply modules are required in the multi-channel isolated power supply, which makes the design cost of the multi-channel isolated power supply very expensive. There is no more effective solution to this technical problem.
[0004] It can be seen that how to provide a flyback multi-channel isolated power supply that can reduce the design cost of the multi-channel isolated power supply while improving the layout flexibility of the multi-channel isolated power supply on the circuit board is a technical problem that needs to be urgently solved by technical personnel in this field. Utility Model Content
[0005] In view of this, the purpose of the utility model is to provide a flyback multi-channel isolated power supply and a frequency converter to solve the technical problems of high design cost of multi-channel isolated power supplies and low layout flexibility of multi-channel isolated power supplies on circuit boards in the prior art. The specific scheme is as follows:
[0006] In order to solve the above technical problems, the utility model provides a flyback multi-channel isolated power supply, including: a first transformer, a switch tube, M first diodes, M second transformers, M×N second diodes, M×N energy storage elements and M×N loads; the winding directions of the primary side and the secondary side of the first transformer are opposite; M≥1, N≥1;
[0007] Among them, the first end and the second end of the primary winding of the first transformer are respectively connected to the positive electrode of the power supply and the first end of the switch tube, the negative electrode of the power supply and the second end of the switch tube are respectively grounded, the control end of the switch tube is used to receive the target control signal, the first end and the second end of each winding of the M secondary windings of the first transformer are respectively connected to the positive electrode of the target first diode and the second end of the primary winding of the target second transformer, the negative electrode of the target first diode is connected to the first end of the primary winding of the target second transformer, and the first end and the second end of each winding of the N secondary windings of the target second transformer are respectively connected to the positive electrode of the target first diode and the second end of the primary winding of the target second transformer. The positive electrode of the diode is connected to the second end of the target energy storage element, the negative electrode of the target second diode is connected to the first end of the target energy storage element, and the first end and the second end of the target energy storage element are respectively connected to the first end and the second end of the target load; the target first diode is any one of the M first diodes, the target second transformer is any one of the M second transformers, the target second diode is any one of the M×N second diodes, the energy storage element is any one of the M×N energy storage elements, and the target load is any one of the M×N loads.
[0008] Preferably, a winding is provided on the secondary side of the first transformer.
[0009] Preferably, it also includes:
[0010] The voltage suppression module is connected in parallel to the primary winding of the first transformer and is used to suppress the peak voltage generated by the primary winding of the first transformer.
[0011] Preferably, the voltage suppression module is specifically an RCD absorption circuit.
[0012] Preferably, the RCD absorption circuit comprises: a first resistor, a first capacitor and a third diode;
[0013] Among them, the first end and the second end of the first resistor are respectively connected to the positive electrode of the power supply and the first end of the first capacitor, the second end of the first capacitor is respectively connected to the second end of the first resistor and the negative electrode of the third diode, and the positive electrode of the third diode is connected to the first end of the switch tube.
[0014] Preferably, it also includes: a transient voltage suppression diode;
[0015] The positive electrode and the negative electrode of the transient voltage suppression diode are connected to the first end and the second end of the first capacitor respectively.
[0016] Preferably, it also includes:
[0017] A voltage stabilizing module is arranged between the cathode of the target second diode and the first end of the target energy storage element, and is used to stabilize the power supply voltage of the target load.
[0018] Preferably, the voltage stabilizing module is specifically a low voltage dropout linear regulator;
[0019] The first end and the second end of the low voltage difference linear regulator are connected to the cathode of the target second diode and the first end of the target energy storage element respectively.
[0020] Preferably, M×N inductors and M×N second capacitors;
[0021] Among them, the cathode of the target second diode is respectively connected to the first end of the target second capacitor and the first end of the target inductor, the second end of the target inductor is connected to the first end of the target energy storage element, and the second end of the target second capacitor is connected to the second end of the target energy storage element; the target inductor is any one of the M×N inductors; the target second capacitor is any one of the M×N capacitors.
[0022] In order to solve the above technical problems, the utility model further provides a frequency converter, including a flyback multi-channel isolated power supply as disclosed above.
[0023] Beneficial effect: In the flyback multi-channel isolated power supply provided by the utility model, since M second transformers are set at the rear stage of the first transformer, compared with the flyback multi-channel isolated power supply in the prior art, when setting the isolated power supply with the same number of channels, the multiple windings that were originally required to be set on the secondary side of the first transformer can be appropriately set on the secondary sides of the M second transformers through this topological structure. This method is equivalent to letting the windings in the first transformer and the M second transformers jointly bear all the windings that were originally required to be set on the secondary side of the first transformer. In this way, the number of settings of the secondary windings of the first transformer can be reduced, thereby reducing the core volume of the main power transformer in the flyback multi-channel isolated power supply, thereby reducing the space occupied by the flyback multi-channel isolated power supply on the circuit board, and further improving the layout flexibility of the flyback multi-channel isolated power supply on the circuit board.
[0024] Moreover, in the flyback multi-channel isolated power supply, only low-cost transformers, diodes and energy storage elements are used to build a multi-channel isolated power supply with high layout flexibility. Compared with the prior art that requires the use of expensive isolation power supply modules to improve the layout flexibility of the multi-channel isolated power supply on the circuit board, the flyback multi-channel isolated power supply can significantly reduce the design cost required when designing the multi-channel isolated power supply. Correspondingly, a frequency converter provided by the utility model also has the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0026] Figure 1 It is a structural diagram of a flyback multi-channel isolated power supply in the prior art;
[0027] Figure 2 A structural diagram of a first flyback multi-channel isolated power supply provided by an embodiment of the utility model;
[0028] Figure 3 A structural diagram of a second flyback multi-channel isolated power supply provided by an embodiment of the utility model;
[0029] Figure 4 A structural diagram of a third flyback multi-channel isolated power supply provided by an embodiment of the utility model;
[0030] Figure 5 This is a structural diagram of a fourth flyback multi-channel isolated power supply provided in an embodiment of the utility model. DETAILED DESCRIPTION
[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0032] See also Figure 2 , Figure 2 The structure diagram of the first flyback multi-channel isolated power supply provided by the embodiment of the utility model includes: a first transformer T1, a switch tube Q1, M first diodes D1, M second transformers T2, M×N second diodes D2, M×N energy storage elements C0 and M×N loads R0; the winding directions of the primary winding and the secondary winding of the first transformer T1 are opposite; M≥1, N≥1;
[0033] Among them, the first end and the second end of the primary winding of the first transformer T1 are respectively connected to the positive electrode of the power supply Vin and the first end of the switch tube Q1, the negative electrode of the power supply Vin and the second end of the switch tube Q1 are respectively grounded, the control end of the switch tube Q1 is used to receive the target control signal G1, the first end and the second end of each winding of the M windings on the secondary side of the first transformer T1 are respectively connected to the positive electrode of the target first diode D1 and the second end of the primary winding of the target second transformer T2, the negative electrode of the target first diode D1 is connected to the first end of the primary winding of the target second transformer T2, and the first end and the second end of each winding of the N windings on the secondary side of the target second transformer T2 are respectively connected to the positive electrode of the target first diode D1 and the second end of the primary winding of the target second transformer T2. The positive electrode is connected to the second end of the target energy storage element C0, the negative electrode of the target second diode D2 is connected to the first end of the target energy storage element C0, and the first end and the second end of the target energy storage element C0 are respectively connected to the first end and the second end of the target load R0; the target first diode D1 is any one of the M first diodes D1, the target second transformer T2 is any one of the M second transformers T2, the target second diode D2 is any one of the M×N second diodes D2, the target energy storage element C0 is any one of the M×N energy storage elements C0, and the target load R0 is any one of the M×N loads R0.
[0034] In this embodiment, the working principle of the flyback multi-channel isolated power supply is first described. Figure 2 ,exist Figure 2 In the flyback multi-channel isolated power supply shown, a specific description is given by taking M and N both as 2 as an example.
[0035] When the switch tube Q1 is turned off, the voltage on the primary side of the first transformer T1 is negative at the top and positive at the bottom. At this time, the first diode D1 on the secondary side of the first transformer T1 is turned on, and the voltage across the primary side of the second transformer T2 is positive at the top and negative at the bottom. The current on the second transformer T2 shows a linear upward trend. In this case, the second diode D2 on the secondary side of the second transformer T2 is turned on, and the second transformer T2 supplies power to each load.
[0036] When the switch tube Q1 is turned on, the voltage on the primary side of the first transformer T1 is positive at the top and negative at the bottom. At this time, the voltage on the secondary side of the first transformer T1 is positive at the bottom and negative at the top, and the voltage on the primary side of the second transformer T2 is negative at the top and positive at the bottom. The current on the second transformer T2 shows a linear downward trend, thus achieving an effective reset of the excitation inductance in the second transformer T2 to prevent the saturation of the second transformer T2. In this case, the second diode D2 on the secondary side of the second transformer T2 is cut off, and energy is released by the energy storage element C0 to power the load R0, so that each output circuit can output a stable voltage.
[0037] It should be noted that in Figure 2 In the embodiment, the winding directions of the primary winding and the secondary winding of the second transformer T2 are the same. V0 represents the output voltage of the load R0, and the output voltage of V0 is equal to the voltage of the primary side of the second transformer T2 multiplied by the turns ratio of the primary side and the secondary side of the second transformer T2. In practical applications, the output voltage of each output circuit in the flyback multi-channel isolated power supply can be adjusted by adjusting the number of coils of each winding of the primary side and the secondary side of the second transformer T2.
[0038] In addition, Figure 2 The circuit diagram shown is an exemplary explanation of the topological structure of the flyback multi-channel isolated power supply. In practical applications, the setting parameters of each device on the secondary side of the first transformer T1 and the secondary side of the second transformer T2 can be adaptively adjusted according to actual conditions, and will not be described in detail here.
[0039] It is worth noting that if the flyback multi-channel isolated power supply is set to Figure 1 The structure will make the cross-regulation rate of each output circuit in the flyback multi-channel isolated power supply poor, that is, one output circuit will have a greater impact on the load of other output circuits after being loaded. In the flyback multi-channel isolated power supply provided by this embodiment, because the primary voltage of the second transformer T2 is lower than the voltage of the first transformer T1, the number of turns of the primary winding of the second transformer T2 can be set to be less, so that the coupling degree between the primary and secondary sides of the second transformer T2 can be increased, and the cross-regulation rate of each output circuit can be relatively good.
[0040] In this embodiment, since M second transformers are arranged at the rear stage of the first transformer, compared with the flyback multi-channel isolated power supply in the prior art, when the same number of isolated power supplies are arranged, the multiple windings originally required to be arranged on the secondary side of the first transformer can be appropriately arranged on the secondary side of the M second transformers through this topological structure. This method is equivalent to allowing the windings in the first transformer and the M second transformers to jointly bear all the windings originally required to be arranged on the secondary side of the first transformer, so that the number of the secondary windings of the first transformer can be reduced, thereby reducing the core volume of the main power transformer in the flyback multi-channel isolated power supply, thereby reducing the space occupied by the flyback multi-channel isolated power supply on the circuit board. Moreover, under this arrangement of the flyback multi-channel isolated power supply, when laying out the various devices on the circuit board, the second transformer T2 can be arranged at a position far away from the first transformer T1, which can not only improve the space utilization of the circuit board, but also further improve the layout flexibility of the flyback multi-channel isolated power supply on the circuit board.
[0041] In addition, in this embodiment, a multi-channel isolated power supply with high layout flexibility can be built by using only low-cost transformers, diodes and energy storage elements. Compared with the prior art that requires the use of expensive isolated power supply modules to improve the layout flexibility of the multi-channel isolated power supply on the circuit board, the flyback multi-channel isolated power supply can also significantly reduce the design cost required when designing a multi-channel isolated power supply.
[0042] Based on the above embodiments, this embodiment further explains and optimizes the technical solution. Figure 3 , Figure 3 This is a structural diagram of a second flyback multi-channel isolated power supply provided by an embodiment of the utility model. As a preferred implementation, a winding is provided on the secondary side of the first transformer T1.
[0043] In practical applications, only one winding can be set on the secondary side of the first transformer T1. In this way, when setting isolated power supplies of the same number of channels, multiple windings that originally need to be set on the secondary side of the first transformer can be set more concentratedly on the primary and secondary windings of multiple second transformers T2 at the rear stage of the first transformer T1. This can significantly reduce the core volume of the main power transformer in the flyback multi-channel isolated power supply and further reduce the space occupied by the flyback multi-channel isolated power supply on the circuit board.
[0044] Based on the above embodiment, this embodiment further illustrates and optimizes the technical solution. As a preferred implementation, the above flyback multi-channel isolated power supply further includes:
[0045] The voltage suppression module is connected in parallel to the primary winding of the first transformer T1 and is used to suppress the peak voltage generated by the primary winding of the first transformer T1.
[0046] In practical applications, during the operation of the flyback multi-channel isolated power supply, the primary side of the first transformer T1 may generate a spike voltage, which seriously affects the stability and reliability of the flyback multi-channel isolated power supply during operation. In order to avoid the above situation, in this embodiment, a voltage suppression module is also provided in the flyback multi-channel isolated power supply, and the voltage suppression module is used to suppress the spike voltage generated by the primary side of the first transformer T1.
[0047] As a preferred implementation, the voltage suppression module is specifically an RCD absorption circuit.
[0048] Specifically, the voltage suppression module can be set as an RCD absorption circuit, and the RCD absorption circuit can be used to suppress the peak voltage generated by the primary side of the first transformer T1. In addition, because the RCD absorption circuit has a relatively simple structure, the structural complexity of the flyback multi-channel isolated power supply can be further reduced.
[0049] See also Figure 3 , Figure 3 The structure diagram of the second flyback multi-channel isolated power supply provided by the embodiment of the utility model. As a preferred implementation, the RCD absorption circuit includes: a first resistor R1, a first capacitor C1 and a third diode D3;
[0050] Among them, the first end and the second end of the first resistor R1 are respectively connected to the positive electrode of the power supply Vin and the first end of the first capacitor C1, the second end of the first capacitor C1 is respectively connected to the second end of the first resistor R1 and the negative electrode of the third diode D3, and the positive electrode of the third diode D3 is connected to the first end of the switch tube.
[0051] In this embodiment, the RCD absorption circuit is specifically described. In the RCD absorption circuit, the first capacitor C1 is mainly used to absorb the peak voltage generated by the primary side of the first transformer T1.
[0052] As a preferred implementation, in practical applications, in order to further enhance the suppression effect of the spike voltage generated by the primary side of the first transformer T1, a transient voltage suppression diode D4 may be added to the circuit; wherein the positive electrode and the negative electrode of the transient voltage suppression diode D4 are respectively connected to the first end and the second end of the first capacitor C1.
[0053] Based on the above embodiments, this embodiment further explains and optimizes the technical solution. Figure 4 , Figure 4 The structure diagram of the third flyback multi-channel isolated power supply provided by the embodiment of the utility model. As a preferred embodiment, the flyback multi-channel isolated power supply also includes:
[0054] The voltage stabilizing module is arranged between the cathode of the target second diode D2 and the first end of the target energy storage element C0, and is used for stabilizing the supply voltage of the target load R0.
[0055] In this embodiment, in order to improve the stability of the flyback multi-channel isolated power supply when supplying power to each load, M×N voltage stabilizing modules may be provided in the flyback multi-channel isolated power supply, and these voltage stabilizing modules may be used to stabilize the supply voltage of each load R0. Specifically, the target load R0 is stabilized by providing a voltage stabilizing module between the cathode of the target second diode D2 and the first end of the target energy storage element C0.
[0056] As a preferred implementation, the voltage stabilizing module is specifically a low dropout linear regulator A (Low Dropout Regulator, LDO); wherein the first and second ends of the low dropout linear regulator are respectively connected to the cathode of the target second diode D2 and the first end of the target energy storage element C0.
[0057] Because the low voltage dropout linear regulator has the advantages of high output accuracy, stable performance and low noise, when the voltage regulator module is set to a low voltage dropout linear regulator, the stability of the flyback multi-channel isolated power supply when supplying power to each load can be further improved.
[0058] Based on the above embodiments, this embodiment further explains and optimizes the technical solution. Figure 5 , Figure 5 This is a structural diagram of a fourth flyback multi-channel isolated power supply provided by an embodiment of the utility model. As a preferred implementation, the flyback multi-channel isolated power supply further includes: M×N inductors L and M×N second capacitors C2;
[0059] Among them, the cathode of the target second diode D2 is respectively connected to the first end of the target second capacitor C2 and the first end of the target inductor L, the second end of the target inductor L is connected to the first end of the target energy storage element C0, and the second end of the target second capacitor C2 is connected to the second end of the target energy storage element C0; the target inductor L is any one of the M×N inductors; the target second capacitor C2 is any one of the M×N capacitors.
[0060] In practical applications, a second capacitor C2 and an inductor L may be connected to the rear end of the target second diode D2 to suppress noise in the flyback multi-channel isolated power supply, thereby making the working performance of the flyback multi-channel isolated power supply more stable and reliable.
[0061] Correspondingly, an embodiment of the utility model further provides a frequency converter, including a flyback multi-channel isolated power supply as disclosed above.
[0062] The frequency converter provided by the embodiment of the utility model has the beneficial effects of the aforementioned flyback multi-channel isolated power supply.
[0063] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A flyback multi-channel isolated power supply, characterized in that: include: A first transformer, a switch tube, M first diodes, M second transformers, M×N second diodes, M×N energy storage elements and M×N loads; the winding directions of the primary side and the secondary side of the first transformer are opposite; M≥1, N≥1; Among them, the first end and the second end of the primary winding of the first transformer are respectively connected to the positive electrode of the power supply and the first end of the switch tube, the negative electrode of the power supply and the second end of the switch tube are respectively grounded, the control end of the switch tube is used to receive the target control signal, the first end and the second end of each winding of the M secondary windings of the first transformer are respectively connected to the positive electrode of the target first diode and the second end of the primary winding of the target second transformer, the negative electrode of the target first diode is connected to the first end of the primary winding of the target second transformer, and the first end and the second end of each winding of the N secondary windings of the target second transformer are respectively connected to the positive electrode of the target first diode and the second end of the primary winding of the target second transformer. The positive electrode of the diode is connected to the second end of the target energy storage element, the negative electrode of the target second diode is connected to the first end of the target energy storage element, and the first end and the second end of the target energy storage element are respectively connected to the first end and the second end of the target load; the target first diode is any one of the M first diodes, the target second transformer is any one of the M second transformers, the target second diode is any one of the M×N second diodes, the target energy storage element is any one of the M×N energy storage elements, and the target load is any one of the M×N loads.
2. A flyback multi-channel isolated power supply according to claim 1, characterized in that: The secondary side of the first transformer is provided with a winding.
3. A flyback multi-channel isolated power supply according to claim 1, characterized in that: Also includes: The voltage suppression module is connected in parallel to the primary winding of the first transformer and is used to suppress the peak voltage generated by the primary winding of the first transformer.
4. A flyback multi-channel isolated power supply according to claim 3, characterized in that: The voltage suppression module is specifically an RCD absorption circuit.
5. A flyback multi-channel isolated power supply according to claim 4, characterized in that: The RCD absorption circuit includes: a first resistor, a first capacitor and a third diode; Among them, the first end and the second end of the first resistor are respectively connected to the positive electrode of the power supply and the first end of the first capacitor, the second end of the first capacitor is respectively connected to the second end of the first resistor and the negative electrode of the third diode, and the positive electrode of the third diode is connected to the first end of the switch tube.
6. A flyback multi-channel isolated power supply according to claim 5, characterized in that: Also includes: Transient voltage suppression diodes; The positive electrode and the negative electrode of the transient voltage suppression diode are connected to the first end and the second end of the first capacitor respectively.
7. The flyback multi-channel isolated power supply according to claim 1, characterized in that: Also includes: A voltage stabilizing module is arranged between the cathode of the target second diode and the first end of the target energy storage element, and is used to stabilize the power supply voltage of the target load.
8. A flyback multi-channel isolated power supply according to claim 7, characterized in that: The voltage stabilizing module is specifically a low voltage drop linear regulator; The first end and the second end of the low voltage difference linear regulator are connected to the cathode of the target second diode and the first end of the target energy storage element respectively.
9. The flyback multi-channel isolated power supply according to claim 1, characterized in that: Also includes: M×N inductors and M×N second capacitors; Among them, the cathode of the target second diode is respectively connected to the first end of the target second capacitor and the first end of the target inductor, the second end of the target inductor is connected to the first end of the target energy storage element, and the second end of the target second capacitor is connected to the second end of the target energy storage element; the target inductor is any one of the M×N inductors; the target second capacitor is any one of the M×N capacitors.
10. A frequency converter, characterized in that: It comprises a flyback multi-channel isolated power supply as described in any one of claims 1 to 9.