Power supply topology circuit structure for grid driving power supply

Abstract

The utility model particularly relates to a power supply topology circuit structure used for grid driving power supply. The power supply topology circuit structure comprises a control unit, an LLC circuit connected with the control unit, and a grid voltage division circuit connected with a rectification structure of the LLC circuit. According to the utility model, the LLC circuit and the grid voltage division circuit are combined, so that the power transformer in the LLC circuit has relatively large leakage inductance and relatively small parasitic capacitance from the first side to the second side, thereby effectively reducing EMI noise coupling, achieving the purpose of improving EMC performance of a new energy motor technology, and improving the reliability of the new energy motor. The circuit at least has the advantages of low EMI noise and high EMC performance.

Description

Technical Field

[0001] This utility model relates to the field of motor drive control technology, and specifically to a power supply topology circuit structure for gate drive power supply. Background Technology

[0002] The vigorous development of new energy technologies has driven the continuous upgrading and iteration of new energy motor technologies, which has led to increasingly higher requirements for the control performance of new energy motor control technologies.

[0003] In existing technologies, to improve the EMC performance of new energy motors, flyback and push-pull topology open-loop power supplies are commonly used for gate drive power supply. Although flyback and push-pull topology open-loop power supply technologies can effectively meet the power supply requirements of new energy motors, their implementation requires minimizing leakage inductance to improve drive efficiency, thereby reducing voltage and current stress and minimizing transformer noise. Due to this working principle, the capacitance of the transformer winding in flyback and push-pull topology open-loop power supply technologies is designed to be too large. This allows the high dv / dt on the inverter power side to couple to the low-voltage side through the transformer winding, amplifying EMI noise and creating new technical problems. Utility Model Content

[0004] To address the technical problem of excessive EMI noise in existing flyback and push-pull open-loop power supply technologies, this invention provides a power supply topology circuit structure for gate drive power supply, which has advantages such as low EMI noise, high EMC performance, and high gate voltage divider control accuracy.

[0005] This utility model provides a power supply topology circuit structure for gate drive power supply, including: a control unit, an LLC circuit connected to the control unit, and a gate voltage divider circuit of the rectifier structure connected to the LLC circuit; the LLC circuit includes an open-loop circuit.

[0006] Specifically, one of the main technical concepts of this utility model is to combine the LLC circuit with the gate voltage divider circuit, and to use the open-loop circuit of the LLC circuit to make the power transformer in the LLC circuit have a large leakage inductance while having a small parasitic capacitance from the first side to the second side, thereby effectively reducing EMI noise coupling and achieving the goal of improving the EMC performance of new energy motor technology.

[0007] Optionally, the open-loop circuit includes a switching structure, a resonant structure, and a transformer structure;

[0008] The switching structure, resonant structure, transformer structure, and rectifier structure are arranged in sequence;

[0009] The resonant structure includes an inductor and a first capacitor. The inductor is positioned between the switching structure and the transformer structure, and the first capacitor is positioned on the first side of the LLC circuit. One end of the first capacitor is connected to the transformer structure, and the other end is grounded.

[0010] Specifically, one of the main technical concepts of this utility model is that by utilizing the above-mentioned structure of the inductor and the first capacitor, the parasitic capacitance (first capacitor) can be reduced to a minimum, thereby minimizing the EMI noise coupling caused by dv / dt from the second side to the first side of the transformer structure, thus improving the EMC performance of the new energy motor technology.

[0011] Optionally, the gate voltage divider circuit includes a second capacitor, a resistor, a first diode, and a first terminal voltage and a second terminal voltage respectively disposed across the two ends of the second capacitor;

[0012] One end of the resistor is connected to the first voltage, one end of the first diode is connected to the second voltage, and the other ends of the resistor and the other ends of the first diode are interconnected and grounded.

[0013] Specifically, one of the main technical concepts of this utility model is that, through the structural design of the second capacitor, resistor, first diode, first terminal voltage, and second terminal voltage, the gate voltage divider circuit has precise voltage dividing performance, thereby improving the control accuracy of the final output voltage.

[0014] Optionally, the rectifier structure is located on the second side of the LLC circuit and includes: a second diode, a third diode, a third capacitor, and a fourth capacitor;

[0015] One end of the transformer structure is connected to the second diode and the third diode, and the other end is connected to the third capacitor and the fourth capacitor. The second diode is connected to the third capacitor, and the third diode is connected to the fourth capacitor.

[0016] Optionally, the switching structure includes a half-bridge topology or a full-bridge topology.

[0017] Furthermore, the switch structure is integrated into the control unit.

[0018] Specifically, one of the main technical concepts of this utility model is to integrate the switch structure into the control unit, thereby improving the integration of the printed circuit, reducing the single-chip area of ​​the printed circuit, and thus reducing the volume cost of this utility model.

[0019] Optionally, the control unit includes a PWM device.

[0020] Furthermore, the control unit includes a soft-start structure, an overcurrent protection structure, and an overvoltage protection structure.

[0021] In summary, this utility model provides a power supply topology circuit structure for gate drive power supply, and its main technical concept has at least the following advantages:

[0022] This invention combines an LLC circuit with a gate voltage divider circuit, so that the power transformer in the LLC circuit has a large leakage inductance while also having a small parasitic capacitance from the first side to the second side. This can effectively reduce EMI noise coupling and achieve the goal of improving the EMC performance of new energy motor technology. It has at least the advantages of low EMI noise and high EMC performance. Attached Figure Description

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0024] Figure 1 A schematic diagram of a power supply topology circuit for gate drive power supply is provided in one embodiment of this utility model;

[0025] Figure 2 A schematic diagram of a power supply topology circuit for gate drive power supply is provided in another embodiment of this utility model;

[0026] Figure 3 An integrated schematic diagram of a switch structure provided in one embodiment of this utility model. Detailed Implementation

[0027] The following is in conjunction with the appendix Figures 1 to 3 The present invention will be described in detail below.

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0029] This utility model provides a power supply topology circuit structure for gate drive power supply. Its main technical concept is to combine LLC circuit with gate voltage divider circuit, so that the power transformer in LLC circuit has a large leakage inductance while also having a small parasitic capacitance from the first side to the second side, thereby reducing EMI noise and improving the EMC performance of new energy motor technology.

[0030] For further details, please see Figure 1 The diagram shown is a schematic diagram of a power supply topology circuit structure for gate drive power supply provided in an embodiment of the present invention.

[0031] Example 1

[0032] This invention provides a power supply topology for gate drive power supply, comprising: a control unit, an LLC circuit connected to the control unit, and a gate voltage divider circuit for the rectifier structure connected to the LLC circuit. The working principle of this invention is as follows: the control unit controls the LLC circuit, ensuring its resonant structure is in a resonant state. This allows for a smaller first capacitor in the resonant structure and reduces EMI coupling noise caused by the dv / dt difference between the second and first sides. Simultaneously, by processing the resonant state of the resonant structure, the voltage division control of the gate voltage divider circuit becomes more precise.

[0033] For further details, please see Figure 2 The diagram shown is a schematic diagram of a power supply topology circuit structure for gate drive power supply provided in another embodiment of this utility model.

[0034] Example 2

[0035] Based on Embodiment 1, this utility model provides Embodiment 2. Embodiment 2 provides a specific implementation structure for a specific application scenario. The LLC circuit includes a switching structure, a resonant structure, and a transformer structure; these are arranged sequentially. The resonant structure includes an inductor and a first capacitor. The inductor is positioned between the switching structure and the transformer structure. The first capacitor is located on the first side of the LLC circuit, with one end connected to the transformer structure and the other end grounded. The gate voltage divider circuit includes a second capacitor, a resistor, a first diode, and a first terminal voltage and a second terminal voltage respectively located across the two ends of the second capacitor. One end of the resistor is connected to the first terminal voltage, and one end of the first diode is connected to the second terminal voltage. The other ends of the resistor and the first diode are interconnected and grounded. The rectifier structure is located on the second side of the LLC circuit and includes a second diode, a third diode, a third capacitor, and a fourth capacitor. One end of the transformer structure is connected to the second and third diodes, and the other end is connected to the third and fourth capacitors. The second diode is connected to the third capacitor, and the third diode is connected to the fourth capacitor. In summary, the working principle of Embodiment 2 provided by this utility model is that the PWM device is used for output control and controls the resonant state of the second capacitor, resistor, and first diode of the resonant structure to achieve precise voltage division by the resistor and the first diode. It is worth explaining that the first side refers to the primary side of the LLC circuit, that is, the side of the switching structure and the resonant structure, and the second side refers to the secondary side of the LLC circuit, that is, the side of the rectifier structure.

[0036] For further details, please see Figure 3 The diagram shown is an integrated schematic diagram of a switch structure provided in an embodiment of this utility model.

[0037] Example 3

[0038] Based on Embodiment 1 or Embodiment 2, this utility model provides Embodiment 3. The switching structure includes a half-bridge topology or a full-bridge topology and is integrated into the PWM device.

[0039] The present invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the present invention and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A power supply topology circuit structure for gate drive power supply, characterized by, The utility model relates to a control unit, LLC circuit connected to the control unit, the grid voltage dividing circuit of rectifier structure connected to LLC circuit; The LLC circuit comprises an open loop circuit. The open loop circuit comprises a switching structure, a resonant structure and a transformer structure.

2. A power supply topology circuit configuration for gate drive power supply as claimed in claim 1, wherein, The switching structure, the resonant structure, the transformer structure and the rectifier structure are sequentially arranged. The resonant structure comprises an inductor and a first capacitor, the inductor is arranged between the switching structure and the transformer structure, the first capacitor is arranged on the first side of the LLC circuit, one end of the first capacitor is connected to the transformer structure, and the other end of the first capacitor is grounded. The grid voltage dividing circuit comprises a second capacitor, a resistor, a first diode, a first terminal voltage and a second terminal voltage arranged on both ends of the second capacitor respectively.

3. A power supply topology circuit configuration for gate drive power supply as claimed in claim 1, wherein, One end of the resistor is connected to the first terminal voltage, one end of the first diode is connected to the second terminal voltage, the other end of the resistor and the other end of the first diode are interconnected and grounded. The rectifier structure is arranged on the second side of the LLC circuit and comprises a second diode, a third diode, a third capacitor and a fourth capacitor.

4. A power supply topology circuit configuration for gate drive power supply as claimed in claim 2, wherein, One end of the transformer structure is connected to the second diode and the third diode respectively, and the other end of the transformer structure is connected to the third capacitor and the fourth capacitor, the second diode is connected to the third capacitor, and the third diode is connected to the fourth capacitor. The switching structure comprises a half-bridge topology or a full-bridge topology.

5. A power supply topology circuit configuration for gate drive power supply as claimed in claim 2, wherein, The switching structure is arranged on the control unit in an integrated manner.

6. A power supply topology circuit configuration for gate drive power supply as claimed in claim 5 wherein, The control unit comprises a PWM device.

7. A power supply topology circuit configuration for gate drive power supply as claimed in claim 1, wherein, The control unit comprises a soft start structure, an overcurrent protection structure and an overvoltage protection structure.

8. A power supply topology circuit configuration for gate drive power supply as claimed in claim 7, wherein, ​

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