Magnetic integrated two-in-one charging circuit
By magnetically integrating the resonant inductor, HVDC output and LVDC output, the problems of low power density and high transformer design cost in the prior art are solved, higher core utilization and power density are achieved, and transformer manufacturing process is simplified.
Patent Information
- Application Number
- CN202420535131.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-03-19
AI Technical Summary
In the prior art, the resonant inductor and transformer are not magnetically integrated, resulting in the power density to be improved, the transformer design cost is high and the manufacturing process is complex.
By magnetically integrating the resonant inductor, HVDC output and LVDC output, sharing the cross-sectional area of the magnetic core, reducing the number of turns of the resonant inductor winding, and optimizing the core loss design.
This improves core utilization, reduces transformer volume, improves power density, while simplifies the transformer manufacturing process and reduces design costs.
Smart Images
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Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric vehicle charging, in particular to a magnetic integrated two-in-one charging circuit. Background Art
[0002] The current magnetic integration solution magnetically integrates HVDC output and LVDC output, which to a certain extent reduces the size of the transformer, reduces the number of power devices and improves power density.
[0003] For example, a double-end output charging circuit in the prior art is provided with a transformer, a primary input circuit arranged on the primary side of the transformer, a main output circuit and an auxiliary output circuit arranged in parallel on the secondary side of the transformer, a primary full-bridge inverter circuit is provided in the primary input circuit, a main full-bridge inverter circuit is provided in the main output circuit, and a half-bridge inverter circuit and a second-stage switch tube for voltage stabilization are provided in the auxiliary output circuit; dead time is generated when the two first-stage switches in the half-bridge inverter circuit are switched on, and the second-stage switch tube is turned off during the dead time. The dead time is generated by the reverse recovery of the magnetic core in the bidirectional magnetization process, and the timing of the subsequent switch device is adjusted during the dead time to reduce the voltage stress of the synchronous rectifier tube and reduce the loss of the absorption circuit of the synchronous rectifier circuit.
[0004] However, the power density needs to be further improved, the resonant inductor and transformer are not magnetically integrated, the transformer design cost is relatively high and the manufacturing process is relatively complicated.
[0005] Therefore, it is necessary to provide a magnetically integrated two-in-one charging circuit to solve the above technical problems. Utility Model Content
[0006] The utility model provides a magnetically integrated two-in-one charging circuit, which solves the problems that the resonant inductor and the transformer are not magnetically integrated, the transformer design cost is relatively high, and the manufacturing process is relatively complicated.
[0007] In order to solve the above technical problems, the utility model provides a magnetic integrated two-in-one charging circuit, comprising: a transformer;
[0008] a first capacitor, wherein the first capacitor is connected to one side of the transformer, the connection ends of the first capacitor are respectively connected to a first power device and a third power device, the connection end of the first power device is connected to a second power device, the connection end of the third power device is connected to a fourth power device, and the connection ends of the second power device and the fourth power device are connected to the transformer;
[0009] a ninth power device, the ninth power device being connected to one side of the transformer, the connection end of the ninth power device being respectively connected to an inductor and a twelfth power device, the connection end of the inductor being connected to a static parallel capacitor, the static parallel capacitor being connected to the connection end of the twelfth power device and then being respectively connected to a tenth power device and an eleventh power device, the tenth power device and the eleventh power device being both connected to the transformer;
[0010] A second capacitor, the second capacitor is connected to the other side of the transformer, the connection ends of the second capacitor are respectively connected to the sixth power device and the seventh power device, the connection end of the sixth power device is connected to the fifth power device, the connection end of the second power device is connected to the eighth power device, and the connection ends of the eighth power device and the fifth power device are connected to the transformer.
[0011] Preferably, the first power device, the second power device, the third power device, the fourth power device, the fifth power device, the sixth power device, the seventh power device, the eighth power device, the ninth power device, the tenth power device, the eleventh power device and the twelfth power device can adopt IGBT, Si MOSFET, SiC MOSFET and GaN transistor.
[0012] Preferably, the ninth power device, the tenth power device, the eleventh power device and the twelfth power device may also adopt DIODE diodes.
[0013] Compared with the related art, the magnetic integrated two-in-one charging circuit provided by the utility model has the following beneficial effects:
[0014] The utility model provides a magnetically integrated two-in-one charging circuit, which further improves the utilization rate of the magnetic core, reduces the volume of the transformer and thus improves the power density by magnetically integrating the resonant inductor with the HVDC output and the LVDC output, and optimizes the magnetic core loss design, simplifies the transformer manufacturing process and reduces the transformer design cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 The present invention provides a preferred circuit diagram of a magnetically integrated two-in-one charging circuit.
[0016] Numbers in the figure: 1. transformer, 2. first capacitor, 21. first power device, 22. second power device, 23. third power device, 24. fourth power device, 3. second capacitor, 31. fifth power device, 32. sixth power device, 33. seventh power device, 34. eighth power device, 4. ninth power device, 41. tenth power device, 42. eleventh power device, 43. twelfth power device, 44. inductor, 45. static parallel capacitor. DETAILED DESCRIPTION
[0017] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.
[0018] Please refer to Figure 1 , Figure 1 A preferred circuit diagram of a magnetically integrated two-in-one charging circuit provided by the utility model. A magnetically integrated two-in-one charging circuit comprises: a transformer 1;
[0019] A first capacitor 2, wherein the first capacitor 2 is connected to one side of the transformer 1, wherein connecting ends of the first capacitor 2 are respectively connected to a first power device 21 and a third power device 23, wherein a connecting end of the first power device 21 is connected to a second power device 22, wherein a connecting end of the third power device 23 is connected to a fourth power device 24, and wherein connecting ends of the second power device 22 and the fourth power device 24 are connected to the transformer 1;
[0020] A ninth power device 4, the ninth power device 4 is connected to one side of the transformer 1, the connection end of the ninth power device 4 is respectively connected to an inductor 44 and a twelfth power device 43, the connection end of the inductor 44 is connected to a static parallel capacitor 45, the static parallel capacitor 45 and the connection end of the twelfth power device 43 are connected to a tenth power device 41 and an eleventh power device 42, respectively, the tenth power device 41 and the eleventh power device 42 are both connected to the transformer 1;
[0021] A second capacitor 3, the second capacitor 3 is connected to the other side of the transformer 1, the connection ends of the second capacitor 3 are respectively connected to a sixth power device 32 and a seventh power device 33, the connection end of the sixth power device 32 is connected to a fifth power device 31, the connection end of the second power device 33 is connected to an eighth power device 34, and the eighth power device 34 is connected to the transformer 1 after the connection ends of the fifth power device 31 are connected.
[0022] The first power device 21, the second power device 22, the third power device 23, the fourth power device 24, the fifth power device 31, the sixth power device 32, the seventh power device 33, the eighth power device 34, the ninth power device 4, the tenth power device 41, the eleventh power device 42 and the twelfth power device 43 can use IGBT, Si MOSFET, SiC MOSFET and GaN transistors.
[0023] The ninth power device 4 , the tenth power device 41 , the eleventh power device 42 and the twelfth power device 43 may also be DIODE diodes.
[0024] The fifth power device 31, the sixth power device 32, the seventh power device 33 and the eighth power device 34 form a HVDC high-voltage primary side, and the HVDC high-voltage primary side adopts a bridge connection; the first power device 21, the second power device 22, the third power device 23 and the fourth power device 24 form a HVDC high-voltage secondary side, and the HVDC high-voltage secondary side adopts a bridge connection; the tenth power device 41 and the eleventh power device 42 form a full-wave rectifier bridge; the ninth power device 4, the twelfth power device 43, the inductor 44 and the static parallel capacitor 45 form a BUCK converter;
[0025] By integrating the resonant inductor, HVDC high-voltage input / output winding and LVDC low-voltage output winding magnetically, the core cross-sectional area can be shared, the core utilization rate can be improved, and the number of turns of the resonant inductor winding can be reduced while keeping the inductance value of the resonant inductor unchanged, the core volume can be reduced, and the power density can be increased; at the same time, the heating loss of the transformer can be optimized and improved;
[0026] The design of transformer 1 uses magnetic integration to integrate the primary resonant inductor with the HVDCDC input / output winding and the LVDC low-voltage output winding (using full-wave rectification, the rectifier tube is at the low-voltage end, and the middle tap output is to the LVDC low-voltage output positive end) to share a magnetic core.
[0027] The working principle of a magnetic integrated two-in-one charging circuit provided by the utility model is as follows:
[0028] The fifth power device 31 and the eighth power device 34 form a group of bridge arms, the seventh power device 33 and the sixth power device 32 form another group of bridge arms, and the two bridge arms are connected to the resonant inductor (TI transformer W1 winding) and the primary side (W2 winding) of T1 transformer 1 through the second capacitor 3; the first power device 21 and the third power device 23 form a group of bridge arms, the second power device 22 and the fourth power device 24 form another group of bridge arms, and the two bridge arms are connected to the secondary side (W3 winding) of T1 transformer 1 through the first capacitor 2; the LVDC low-voltage output is connected to the BUCK converter through the low-voltage output winding (W4, W5 windings) of T1 transformer 1 through a full-wave rectifier bridge.
[0029] Compared with the related art, the magnetic integrated two-in-one charging circuit provided by the utility model has the following beneficial effects:
[0030] By magnetically integrating the resonant inductor with the HVDC output and the LVDC output, the utilization rate of the magnetic core is further improved, the volume of the transformer 1 is reduced, and the power density is increased. At the same time, the magnetic core loss design is optimized, the transformer manufacturing process is simplified, and the design cost of the transformer 1 is reduced.
[0031] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A magnetically integrated two-in-one charging circuit, characterized in that: include: transformer; a first capacitor, wherein the first capacitor is connected to one side of the transformer, the connection ends of the first capacitor are respectively connected to a first power device and a third power device, the connection end of the first power device is connected to a second power device, the connection end of the third power device is connected to a fourth power device, and the connection ends of the second power device and the fourth power device are connected to the transformer; a ninth power device, the ninth power device being connected to one side of the transformer, the connection end of the ninth power device being respectively connected to an inductor and a twelfth power device, the connection end of the inductor being connected to a static parallel capacitor, the static parallel capacitor being connected to the connection end of the twelfth power device and then being respectively connected to a tenth power device and an eleventh power device, the tenth power device and the eleventh power device being both connected to the transformer; A second capacitor, the second capacitor is connected to the other side of the transformer, the connection ends of the second capacitor are respectively connected to the sixth power device and the seventh power device, the connection end of the sixth power device is connected to the fifth power device, the connection end of the second power device is connected to the eighth power device, and the connection ends of the eighth power device and the fifth power device are connected to the transformer.
2. The magnetic integrated two-in-one charging circuit according to claim 1, characterized in that: The first power device, the second power device, the third power device, the fourth power device, the fifth power device, the sixth power device, the seventh power device, the eighth power device, the ninth power device, the tenth power device, the eleventh power device and the twelfth power device use IGBT, SiMOSFET, SiC MOSFET and GaN transistors.
3. The magnetic integrated two-in-one charging circuit according to claim 2, characterized in that: The ninth power device, the tenth power device, the eleventh power device and the twelfth power device may use DIODE diodes.