A power adapter circuit with good dynamic performance

Abstract

The utility model discloses a power adapter circuit that good dynamic performance includes comprise transformer, LLC conversion circuit unit, PFC regulating circuit unit, signal feedback circuit unit, LLC controller and PFC controller, LLC conversion circuit unit and transformer and PFC regulating circuit unit electricity are connected. Signal feedback circuit unit is coupled with transformer to feed back the voltage signal of transformer to LLC controller and PFC controller. LLC controller and LLC conversion circuit unit electricity are connected, and PFC controller and PFC regulating circuit unit electricity are connected. The utility model has the advantages of convenient debugging, good dynamic performance, faster response speed, easy output high-precision voltage.

Description

Technical Field

[0001] This utility model relates to the field of power adapter technology, and in particular to a power adapter circuit with good dynamic performance. Background Technology

[0002] With the development of technology, electronic products have also flourished and have permeated all aspects of life. In electronic products, power adapters convert the voltage from the AC mains to the voltage supplied to the electronic devices, enabling them to obtain the appropriate electrical energy. Power adapters play a crucial role in supplying voltage and current to electronic products.

[0003] The existing power adapter technology uses a three-stage structure: "Power Factor Correction + Half-Bridge Soft Switching + Synchronous Rectification" (PFC + LLC + SR). This solution employs power factor correction, soft switching, and synchronous rectification technologies. Currently, power adapters with this structure offer high efficiency and power output, but the existing circuitry is difficult to debug. Therefore, solving the problem of debugging existing circuitry has become an urgent issue to be addressed in this field. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a power adapter circuit with good dynamic performance that is easy to debug.

[0005] This utility model provides a power adapter circuit with good dynamic performance, including a transformer, an LLC conversion circuit unit, a PFC regulation circuit unit, a signal feedback circuit unit, an LLC controller, and a PFC controller. The LLC conversion circuit unit is electrically connected to the transformer and the PFC regulation circuit unit. The signal feedback circuit unit is coupled to the transformer to feed back the voltage signal of the transformer to the LLC controller and the PFC controller. The LLC controller is electrically connected to the LLC conversion circuit unit, and the PFC controller is electrically connected to the PFC regulation circuit unit.

[0006] In one embodiment, the signal feedback circuit unit includes a first coupling coil, a first resistor, and a first diode. A first end of the first coupling coil is electrically connected to the anode of the first diode, and a second end of the first coupling coil is grounded. A first end of the first resistor is electrically connected to the LLC controller, and a second end of the first resistor is electrically connected to the cathode of the first diode. The cathode of the first diode is electrically connected to the PFC controller.

[0007] In one embodiment, the signal feedback circuit unit further includes a second coupling coil and a second diode. The first end of the second coupling coil is grounded, and the second end of the second coupling coil is electrically connected to the anode of the second diode. The cathode of the second diode is electrically connected to the cathode of the first diode.

[0008] In one embodiment, the LLC converter circuit unit includes a second resistor, an inductor, a first capacitor, a ferrite bead, a first field-effect transistor (FET), and a second FET. The first end of the second resistor is electrically connected to the gate of the first FET, and the second end of the second resistor is electrically connected to the LLC controller. The first end of the inductor is electrically connected to the source of the first FET, and the second end of the inductor is electrically connected to the first end of the primary coil of the transformer.

[0009] The first terminal of the first capacitor is electrically connected to the second terminal of the primary coil of the transformer, and the second terminal of the first capacitor is grounded; the first terminal of the ferrite bead is electrically connected to the PFC regulation circuit unit, and the second terminal of the ferrite bead is electrically connected to the drain of the first field-effect transistor; the drain of the second field-effect transistor is electrically connected to the first terminal of the inductor, the source of the second field-effect transistor is grounded, and the gate of the second field-effect transistor is electrically connected to the LLC controller.

[0010] In one embodiment, the LLC conversion circuit unit further includes a third resistor, a fourth resistor, and a fifth resistor. The first end of the third resistor is electrically connected to the gate of the second field-effect transistor, and the second end of the third resistor is electrically connected to the LLC controller. The gate of the second field-effect transistor is electrically connected to the LLC controller through the third resistor.

[0011] The first end of the fourth resistor is electrically connected to the source of the first field-effect transistor, and the second end of the fourth resistor is electrically connected to the gate of the first field-effect transistor; the first end of the fifth resistor is electrically connected to the source of the second field-effect transistor, and the second end of the fifth resistor is electrically connected to the gate of the second field-effect transistor.

[0012] In one embodiment, the LLC conversion circuit unit further includes a sixth resistor, a seventh resistor, a third diode, and a fourth diode. The second resistor is electrically connected to the LLC controller through the sixth resistor, and the third resistor is electrically connected to the LLC controller through the seventh resistor. The third diode is connected in parallel with the sixth resistor, and the fourth diode is connected in parallel with the seventh resistor.

[0013] In one embodiment, the LLC converter circuit unit further includes a second capacitor and a third capacitor. The first terminal of the second capacitor is electrically connected to the PFC regulation circuit unit, and the second terminal of the second capacitor is electrically connected to the second terminal of the primary coil of the transformer. The first terminal of the third capacitor is electrically connected to the PFC regulation circuit unit, and the second terminal of the third capacitor is electrically connected to the source of the first field-effect transistor.

[0014] In one embodiment, the LLC conversion circuit unit further includes a fourth capacitor, a fifth capacitor, a sixth capacitor, and an eighth resistor. The first terminal of the fourth capacitor is electrically connected to the first terminal of the first capacitor, the second terminal of the fourth capacitor is electrically connected to the first terminal of the fifth capacitor, and the second terminal of the fifth capacitor is electrically connected to the LLC controller. The first terminal of the sixth capacitor is electrically connected to the second terminal of the fourth capacitor, and the second terminal of the sixth capacitor is grounded. The eighth resistor is connected in parallel with the sixth capacitor.

[0015] In one embodiment, the LLC converter circuit unit further includes a seventh capacitor, an eighth capacitor, a ninth capacitor, a ninth resistor, a tenth resistor, and an eleventh resistor. The first terminal of the seventh capacitor is electrically connected to the first terminal of the fourth capacitor, and the second terminal of the seventh capacitor is electrically connected to the first terminal of the ninth resistor and the LLC controller. The eighth capacitor is connected in parallel with the ninth resistor and the ninth capacitor. The second terminal of the ninth resistor is grounded. The first terminal of the tenth resistor is electrically connected to the first terminal of the fourth capacitor, the second terminal of the tenth resistor is electrically connected to the first terminal of the eleventh resistor, and the second terminal of the eleventh resistor is electrically connected to the second terminal of the seventh capacitor.

[0016] In one embodiment, the signal feedback circuit unit further includes a transistor, a Zener diode, a fifth diode, and a twelfth resistor. The base of the transistor is electrically connected to the cathode of the Zener diode, the emitter of the transistor is electrically connected to the PFC controller, and the collector of the transistor is electrically connected to the cathode of the first diode. The anode of the Zener diode is electrically connected to the anode of the fifth diode, and the cathode of the fifth diode is grounded. The first terminal of the twelfth resistor is electrically connected to the collector of the transistor, and the second terminal of the twelfth resistor is electrically connected to the anode of the Zener diode.

[0017] This invention offers the following advantages: Through the cooperation of an LLC converter circuit unit, a PFC regulation circuit unit, a signal feedback circuit unit, an LLC controller, and a PFC controller, the LLC converter circuit unit is electrically connected to the transformer and the PFC regulation circuit unit. The signal feedback circuit unit is coupled to the transformer to feed back the transformer's voltage signal to the LLC controller and the PFC controller. The LLC controller is electrically connected to the LLC converter circuit unit, and the PFC controller is electrically connected to the PFC regulation circuit unit. Therefore, changes in voltage at the transformer can be quickly fed back to the PFC controller and the LLC controller via the signal feedback circuit unit, allowing for adjustment of the LLC converter circuit unit and the PFC regulation circuit unit. This design offers advantages such as ease of debugging and good dynamic performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the power adapter circuit with good dynamic performance according to this utility model.

[0019] Figure 2 This is a partial circuit diagram of the power adapter circuit with good dynamic performance according to this utility model. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, embodiments of the present invention and the various features thereof can be combined with each other, all of which are within the protection scope of the present invention.

[0021] Please see Figure 1 and Figure 2 This utility model provides a power adapter circuit with good dynamic performance, including a rectifier circuit unit 1, a filter circuit unit 2, a transformer 3, an LLC converter circuit unit 4, a PFC regulation circuit unit 5, a signal feedback circuit unit 6, an LLC controller 7, and a PFC controller 8. The filter circuit unit 2 is electrically connected to the rectifier circuit unit 1 and the PFC regulation circuit unit 5. The LLC converter circuit unit 4 is electrically connected to the transformer 3 and the PFC regulation circuit unit 5. The signal feedback circuit unit 6 is coupled to the transformer 3 to feed back the voltage signal of the transformer 3 to the LLC controller 7 and the PFC controller 8. The LLC controller 7 is electrically connected to the LLC converter circuit unit 4, and the PFC controller 8 is electrically connected to the PFC regulation circuit unit 5.

[0022] The signal feedback circuit unit 6 includes a first coupling coil L1, a first resistor R1, and a first diode D1. The first end of the first coupling coil L1 is electrically connected to the anode of the first diode D1, and the second end of the first coupling coil L1 is grounded. The first end of the first resistor R1 is electrically connected to the LLC controller 7, and the second end of the first resistor R1 is electrically connected to the cathode of the first diode D1. The cathode of the first diode D1 is electrically connected to the PFC controller 8.

[0023] The signal feedback circuit unit 6 also includes a second coupling coil L2 and a second diode D2. The first end of the second coupling coil L2 is grounded, and the second end of the second coupling coil L2 is electrically connected to the anode of the second diode D2. The cathode of the second diode D2 is electrically connected to the cathode of the first diode D1. The cooperation between the second coupling coil L2 and the first coupling coil L1 allows for real-time signal feedback throughout the entire signal cycle.

[0024] The signal feedback circuit unit 6 also includes a transistor T, a Zener diode DT, a fifth diode D5, and a twelfth resistor R12. The base of transistor T is electrically connected to the cathode of Zener diode DT, the emitter of transistor T is electrically connected to the PFC controller 8, and the collector of transistor T is electrically connected to the cathode of the first diode D1. The anode of Zener diode DT is electrically connected to the anode of the fifth diode D5, and the cathode of the fifth diode D5 is grounded. The first terminal of the twelfth resistor R12 is electrically connected to the collector of transistor T, and the second terminal of the twelfth resistor R12 is electrically connected to the anode of Zener diode DT. This circuit has the advantage of stable and reliable signal conditioning.

[0025] LLC converter circuit unit 4 includes a second resistor R2, an inductor L3, a first capacitor C1, a ferrite bead FB, a first field-effect transistor Q1, and a second field-effect transistor Q2. The first end of the second resistor R2 is electrically connected to the gate of the first field-effect transistor Q1, and the second end of the second resistor R2 is electrically connected to the LLC controller 7. The first end of the inductor L3 is electrically connected to the source of the first field-effect transistor Q1, and the second end of the inductor L3 is electrically connected to the first end of the primary coil of the transformer 3.

[0026] The first terminal of the first capacitor C1 is electrically connected to the second terminal of the primary coil of the transformer 3, and the second terminal of the first capacitor C1 is grounded. The first terminal of the ferrite bead FB is electrically connected to the PFC regulation circuit unit 5, and the second terminal of the ferrite bead FB is electrically connected to the drain of the first field-effect transistor Q1. The drain of the second field-effect transistor Q2 is electrically connected to the first terminal of the inductor L3, the source of the second field-effect transistor Q2 is grounded, and the gate of the second field-effect transistor Q2 is electrically connected to the LLC controller 7. Because the transformer 3 and the inductor L3 used for resonance are designed independently, it is more flexible to select a smaller inductor L3 and transformer 3 that can achieve higher power, significantly reducing the product size and achieving better performance.

[0027] LLC conversion circuit unit 4 also includes a third resistor R3, a fourth resistor R4 and a fifth resistor R5. The first end of the third resistor R3 is electrically connected to the gate of the second field-effect transistor Q2, and the second end of the third resistor R3 is electrically connected to the LLC controller 7. The gate of the second field-effect transistor Q2 is electrically connected to the LLC controller 7 through the third resistor R3.

[0028] The first terminal of the fourth resistor R4 is electrically connected to the source of the first field-effect transistor Q1, and the second terminal of the fourth resistor R4 is electrically connected to the gate of the first field-effect transistor Q1. The first terminal of the fifth resistor R5 is electrically connected to the source of the second field-effect transistor Q2, and the second terminal of the fifth resistor R5 is electrically connected to the gate of the second field-effect transistor Q2.

[0029] LLC conversion circuit unit 4 also includes a sixth resistor R6, a seventh resistor R7, a third diode D3, and a fourth diode D4. The second resistor R2 is electrically connected to the LLC controller 7 through the sixth resistor R6, and the third resistor R3 is electrically connected to the LLC controller 7 through the seventh resistor R7. The third diode D3 is connected in parallel with the sixth resistor R6, and the fourth diode D4 is connected in parallel with the seventh resistor R7.

[0030] LLC converter circuit unit 4 also includes a second capacitor C2 and a third capacitor C3. The first terminal of the second capacitor C2 is electrically connected to the PFC regulation circuit unit 5, and the second terminal of the second capacitor C2 is electrically connected to the second terminal of the primary coil of the transformer 3. The first terminal of the third capacitor C3 is electrically connected to the PFC regulation circuit unit, and the second terminal of the third capacitor C3 is electrically connected to the source of the first field-effect transistor Q1.

[0031] LLC conversion circuit unit 4 also includes a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, and an eighth resistor R8. The first terminal of the fourth capacitor C4 is electrically connected to the first terminal of the first capacitor C1, and the second terminal of the fourth capacitor C4 is electrically connected to the first terminal of the fifth capacitor C5. The second terminal of the fifth capacitor C5 is electrically connected to the LLC controller 7. The first terminal of the sixth capacitor C6 is electrically connected to the second terminal of the fourth capacitor C4, and the second terminal of the sixth capacitor C6 is grounded. The eighth resistor R8 is connected in parallel with the sixth capacitor C6.

[0032] LLC converter circuit unit 4 also includes a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11. The first terminal of the seventh capacitor C7 is electrically connected to the first terminal of the fourth capacitor C4, and the second terminal of the seventh capacitor C7 is electrically connected to the first terminal of the ninth resistor R9 and the LLC controller 7. The eighth capacitor C8 is connected in parallel with the ninth resistor R9 and the ninth capacitor C9. The second terminal of the ninth resistor R9 is grounded. The first terminal of the tenth resistor R10 is electrically connected to the first terminal of the fourth capacitor C4, the second terminal of the tenth resistor R10 is electrically connected to the first terminal of the eleventh resistor R11, and the second terminal of the eleventh resistor R11 is electrically connected to the second terminal of the seventh capacitor C7. The parallel connection of capacitors and resistors forms a low-pass filter. Capacitors have lower impedance to high-frequency signals, while resistors have a fixed impedance to signals of all frequencies. High-frequency signals preferentially pass through the capacitor, while low-frequency signals pass through the resistor, thus filtering out high-frequency noise.

[0033] The PFC regulation circuit unit 5 includes a first boost inductor L3, a second boost inductor L3, a third field-effect transistor Q3, a fourth field-effect transistor Q4, a sixth diode D6, a seventh diode D7, an eighth diode D8, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, and a twentieth resistor R20. The PFC controller 8 is connected to the third field-effect transistor Q3 through the fifteenth resistor R15 and the sixteenth resistor R16. The PFC controller 8 is connected to the fourth field-effect transistor Q4 through the nineteenth resistor R19 and the twentieth resistor R20. The third field-effect transistor Q3 is used to control the first boost inductor L3, and the fourth field-effect transistor Q4 is used to control the second boost inductor L3. Both are electrically connected to the LLC converter circuit unit 4 through the eighth diode D8. Both the first boost inductor L3 and the second boost inductor L3 are electrically connected to the filter circuit unit 2. The filter circuit unit 2 includes a filter inductor L3, a tenth capacitor C10, and an eleventh capacitor C11. The filter inductor L3 is electrically connected to the tenth capacitor C10 and the eleventh capacitor C11 and is used to filter the electrical signal output by the rectifier circuit.

[0034] In summary, this invention, through the cooperation of LLC conversion circuit unit 4, PFC regulation circuit unit 5, signal feedback circuit unit 6, LLC controller 7, and PFC controller 8, achieves the following: LLC conversion circuit unit 4 is electrically connected to transformer 3 and PFC regulation circuit unit 5; signal feedback circuit unit 6 is coupled to transformer 3 to feed back the voltage signal of transformer 3 to LLC controller 7 and PFC controller 8; LLC controller 7 is electrically connected to LLC conversion circuit unit 4; and PFC controller 8 is electrically connected to PFC regulation circuit unit 5. Therefore, changes in voltage at transformer 3 can be quickly fed back to PFC controller 8 and LLC controller 7 via signal feedback circuit unit 6, thereby regulating LLC conversion circuit unit 4 and PFC regulation circuit unit 5. This design offers advantages such as ease of debugging and good dynamic performance.

[0035] The above provides a detailed description of the power adapter circuit with good dynamic performance provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. Furthermore, those skilled in the art will recognize that, based on the idea of ​​this utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification is only an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model and should not be construed as a limitation of this utility model.

Claims

1. A power adapter circuit with good dynamic performance, characterized in that, The system includes a transformer, an LLC conversion circuit unit, a PFC regulation circuit unit, a signal feedback circuit unit, an LLC controller, and a PFC controller. The LLC conversion circuit unit is electrically connected to the transformer and the PFC regulation circuit unit. The signal feedback circuit unit is coupled to the transformer to feed back the transformer's voltage signal to the LLC controller and the PFC controller. The LLC controller is electrically connected to the LLC conversion circuit unit, and the PFC controller is electrically connected to the PFC regulation circuit unit.

2. The power adapter circuit with good dynamic performance as described in claim 1, characterized in that, The signal feedback circuit unit includes a first coupling coil, a first resistor, and a first diode. The first end of the first coupling coil is electrically connected to the anode of the first diode, and the second end of the first coupling coil is grounded. The first end of the first resistor is electrically connected to the LLC controller, and the second end of the first resistor is electrically connected to the cathode of the first diode. The cathode of the first diode is electrically connected to the PFC controller.

3. The power adapter circuit with good dynamic performance as described in claim 2, characterized in that, The signal feedback circuit unit further includes a second coupling coil and a second diode. The first end of the second coupling coil is grounded, and the second end of the second coupling coil is electrically connected to the anode of the second diode. The cathode of the second diode is electrically connected to the cathode of the first diode.

4. The power adapter circuit with good dynamic performance as described in any one of claims 1 to 3, characterized in that, The LLC converter circuit unit includes a second resistor, an inductor, a first capacitor, a ferrite bead, a first field-effect transistor, and a second field-effect transistor. The first end of the second resistor is electrically connected to the gate of the first field-effect transistor, and the second end of the second resistor is electrically connected to the LLC controller. The first end of the inductor is electrically connected to the source of the first field-effect transistor, and the second end of the inductor is electrically connected to the first end of the primary coil of the transformer. The first terminal of the first capacitor is electrically connected to the second terminal of the primary coil of the transformer, and the second terminal of the first capacitor is grounded; the first terminal of the ferrite bead is electrically connected to the PFC regulation circuit unit, and the second terminal of the ferrite bead is electrically connected to the drain of the first field-effect transistor; the drain of the second field-effect transistor is electrically connected to the first terminal of the inductor, the source of the second field-effect transistor is grounded, and the gate of the second field-effect transistor is electrically connected to the LLC controller.

5. The power adapter circuit with good dynamic performance as described in claim 4, characterized in that, The LLC conversion circuit unit further includes a third resistor, a fourth resistor, and a fifth resistor. The first end of the third resistor is electrically connected to the gate of the second field-effect transistor, and the second end of the third resistor is electrically connected to the LLC controller. The gate of the second field-effect transistor is electrically connected to the LLC controller through the third resistor. The first end of the fourth resistor is electrically connected to the source of the first field-effect transistor, and the second end of the fourth resistor is electrically connected to the gate of the first field-effect transistor; the first end of the fifth resistor is electrically connected to the source of the second field-effect transistor, and the second end of the fifth resistor is electrically connected to the gate of the second field-effect transistor.

6. The power adapter circuit with good dynamic performance as described in claim 5, characterized in that, The LLC conversion circuit unit further includes a sixth resistor, a seventh resistor, a third diode, and a fourth diode. The second resistor is electrically connected to the LLC controller through the sixth resistor, and the third resistor is electrically connected to the LLC controller through the seventh resistor. The third diode is connected in parallel with the sixth resistor, and the fourth diode is connected in parallel with the seventh resistor.

7. The power adapter circuit with good dynamic performance as described in claim 4, characterized in that, The LLC converter circuit unit further includes a second capacitor and a third capacitor. The first terminal of the second capacitor is electrically connected to the PFC regulation circuit unit, and the second terminal of the second capacitor is electrically connected to the second terminal of the primary coil of the transformer. The first terminal of the third capacitor is electrically connected to the PFC regulation circuit unit, and the second terminal of the third capacitor is electrically connected to the source of the first field-effect transistor.

8. The power adapter circuit with good dynamic performance as described in claim 4, characterized in that, The LLC conversion circuit unit further includes a fourth capacitor, a fifth capacitor, a sixth capacitor, and an eighth resistor. The first terminal of the fourth capacitor is electrically connected to the first terminal of the first capacitor, the second terminal of the fourth capacitor is electrically connected to the first terminal of the fifth capacitor, and the second terminal of the fifth capacitor is electrically connected to the LLC controller. The first terminal of the sixth capacitor is electrically connected to the second terminal of the fourth capacitor, and the second terminal of the sixth capacitor is grounded. The eighth resistor is connected in parallel with the sixth capacitor.

9. The power adapter circuit with good dynamic performance as described in claim 8, characterized in that, The LLC conversion circuit unit further includes a seventh capacitor, an eighth capacitor, a ninth capacitor, a ninth resistor, a tenth resistor, and an eleventh resistor. The first terminal of the seventh capacitor is electrically connected to the first terminal of the fourth capacitor, and the second terminal of the seventh capacitor is electrically connected to the first terminal of the ninth resistor and the LLC controller. The eighth capacitor is connected in parallel with the ninth resistor and the ninth capacitor. The second terminal of the ninth resistor is grounded. The first terminal of the tenth resistor is electrically connected to the first terminal of the fourth capacitor, the second terminal of the tenth resistor is electrically connected to the first terminal of the eleventh resistor, and the second terminal of the eleventh resistor is electrically connected to the second terminal of the seventh capacitor.

10. The power adapter circuit with good dynamic performance as described in claim 2 or 3, characterized in that, The signal feedback circuit unit further includes a transistor, a Zener diode, a third diode, and a twelfth resistor. The base of the transistor is electrically connected to the cathode of the Zener diode, the emitter of the transistor is electrically connected to the PFC controller, and the collector of the transistor is electrically connected to the cathode of the first diode. The anode of the Zener diode is electrically connected to the anode of the third diode, and the cathode of the third diode is grounded. The first terminal of the twelfth resistor is electrically connected to the collector of the transistor, and the second terminal of the twelfth resistor is electrically connected to the anode of the Zener diode.

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