A 40.68 MHz power supply driving circuit

Abstract

This utility model relates to a 40.68MHz power source drive circuit, including a transformer-coupled amplifier circuit, a transformer T1, and a Class B push-pull amplifier circuit. The transformer-coupled amplifier circuit is connected to the primary side of the transformer T1, and the secondary side of the transformer T1 is connected to the Class B push-pull amplifier circuit. The transformer-coupled amplifier circuit amplifies the input sinusoidal signal, which is then coupled to the Class B push-pull amplifier circuit via the transformer T1, resulting in a stable 40.86MHz sinusoidal high-power voltage with low harmonic components and low parasitic noise. The compact component layout and short interconnect design reduce the area of ​​high-frequency current loops in the circuit, thereby reducing spike interference and heat generation. This utility model mounts all components on a printed circuit board and arranges them rationally, resulting in short interconnects and no crossovers. Within the 40MHz frequency range, it achieves a perfect high-power sinusoidal output, improving the reliability and stability of the circuit.

Description

Technical Field

[0001] This utility model relates to the field of high-frequency power source technology, and in particular to a 40.68MHz power source drive circuit. Background Technology

[0002] A 40MHz sinusoidal high-power power supply is widely used in equipment in industries such as semiconductors, solar photovoltaics, industrial coating, plasma cleaning, nanomaterials processing, and material surface modification. To meet the requirements of these industries, a switching hybrid resonant circuit is typically used to convert the square wave output from the front-end switching circuit into a sinusoidal wave with low harmonic components and low parasitic noise. Since the equipment requires power output ranging from several thousand to tens of kilowatts, the switching power transistors, inductors, capacitors, and transformers in the hybrid resonant circuit will bear a large current and power. At the same time, high-frequency currents of tens to hundreds of amperes flow through the switching power transistors, each stage of resonant inductors, capacitors, transformers, and the interconnections between each stage, causing the circuit to generate significant spike interference and heat. Furthermore, due to unreasonable component layout and wiring design, the circuit performance and stability are severely affected. Summary of the Invention

[0003] In view of this, the present invention provides a 40.68MHz power source drive circuit, which effectively solves the problems of spike interference and heat generation in traditional 40MHz drive circuits, and improves the reliability and stability of the circuit.

[0004] To achieve the above objectives, this utility model provides a 40.68MHz power source drive circuit, including a transformer-coupled amplifier circuit, a transformer T1, and a Class B push-pull amplifier circuit; the transformer-coupled amplifier circuit is connected to the primary side of the transformer T1, and the secondary side of the transformer T1 is connected to the Class B push-pull amplifier circuit.

[0005] Preferably, the transformer-coupled amplifier circuit includes a first connection port CN1, a second resistor R2, a first capacitor C1, a first MOSFET Q1, a third connection port CN3, a fifth resistor R5, an eighth resistor R8, a tenth resistor R10, and a first variable resistor VR1.

[0006] Pin 1 of the first connection port CN1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is connected to the gate of the first MOS transistor Q1.

[0007] Pin 1 of the third connection port CN3 is connected to one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to pin 3 of the first variable resistor VR1, pin 2 of the first variable resistor VR1 is connected to one end of the eighth resistor R8, the other end of the eighth resistor R8 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected to the gate of the first MOS transistor Q1.

[0008] Pin 1 of the third connection port CN3 is connected to an external DC power supply, and is connected to the drain of the first MOS transistor Q1 through the secondary side of the transformer T1.

[0009] Preferably, the transformer-coupled amplifier circuit further includes a first resistor R1, a third resistor R3, and a fourth resistor R4. One end of the first resistor R1 is connected to pin 1 of the first connection port CN1, and the other end of the first resistor R1 is connected to the source of the first MOS transistor Q1.

[0010] Preferably, the transformer-coupled amplifier circuit further includes a sixth resistor R6, a seventh resistor R7, a ninth resistor R9, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a twenty-ninth capacitor C29, a thirtieth capacitor C30, and a first switching diode IC1.

[0011] The thirtieth capacitor C30 and the twenty-ninth capacitor C29 are connected in parallel and are respectively connected to pin 1 and pin 2 of the third connection port CN3. One end of the fifth capacitor C5 is connected to pin 2 of the third connection port CN3, and the other end of the fifth capacitor C5 is connected to pin 2 of the first variable resistor VR1. The ninth resistor R9 is connected in parallel with the fifth capacitor C5. One end of the third capacitor C3 is connected to pin 2 of the third connection port CN3, and the other end of the third capacitor C3 is connected to the connection point of the fifth resistor R5 and the eighth resistor R8. One end of the sixth resistor R6 is connected to pin 2 of the third connection port CN3, and the other end of the sixth resistor R6 is connected to the gate of the first MOS transistor Q1. The sixth capacitor C6 and the first switching diode IC1 are connected in parallel with the first variable resistor VR1.

[0012] One end of the seventh resistor R7 is connected to the gate of the first MOS transistor Q1, the other end of the seventh resistor R7 is connected to one end of the second capacitor C2, the other end of the second capacitor C2 is connected to pin 2 of the primary side of the transformer T1, and the fourth capacitor C4 is connected to pin 1 of the primary side of the transformer T1.

[0013] Preferably, the transformer class B push-pull amplifier circuit includes an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, a second MOSFET Q2, and a third MOSFET Q3.

[0014] Pin 4 of the secondary side of transformer T1 is connected to one end of the thirteenth resistor R13. The other end of the thirteenth resistor R13 is connected to one end of the eighth capacitor C8. The other end of the eighth capacitor C8 is connected to the drain of the second MOSFET Q2. One end of the eleventh resistor R11 is connected to pin 4 of the secondary side of transformer T1. The other end of the eleventh resistor R11 is connected to one end of the twelfth resistor R12 and the fifteenth resistor R15. The other end of the twelfth resistor R12 is connected to pin 3 of the secondary side of transformer T1. One end of the tenth capacitor C10 is connected to... The connection points of the eleventh resistor R11 and the twelfth resistor R12 are connected. The other end of the tenth capacitor C10 is connected to the source of the second MOSFET Q2. The gate of the third MOSFET Q3 is connected to the secondary pin 3 of the transformer T1. The drain of the third MOSFET Q3 is connected to the source of the second MOSFET Q2. The source of the third MOSFET Q3 is connected to one end of the ninth capacitor C9. The other end of the ninth capacitor C9 is connected to one end of the fourteenth resistor R14. The other end of the fourteenth resistor R14 is connected to the secondary pin 3 of the transformer T1.

[0015] Preferably, the transformer class B push-pull amplifier circuit further includes a 22nd capacitor C22, a 23rd capacitor C23, a 27th capacitor C27, a 28th capacitor C28, and a fourth connection port CN4. The 22nd capacitor C22, the 23rd capacitor C23, the 27th capacitor C27, and the 28th capacitor C28 are connected in parallel and one end is connected to the fourth connection port CN4, and CN4 provides DC power.

[0016] Preferably, the Class B push-pull amplifier circuit of the transformer further includes a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-first capacitor C21, and a transformer T2. The thirteenth capacitor C13, the fourteenth capacitor C14, and the fifteenth capacitor C15 are connected in parallel and one end is connected to the primary side pin 5 of the transformer T2. The nineteenth capacitor C19, the twentieth capacitor C20, and the twenty-first capacitor C21 are connected in parallel and one end is connected to the primary side pin 5 of the transformer T2. The sixteenth capacitor C16, the seventeenth capacitor C17, and the eighteenth capacitor C18 are connected in parallel and one end is connected to the primary side pin 3 of the transformer T2.

[0017] Preferably, the transformer class B push-pull amplifier circuit further includes a 24th capacitor C24, a 25th capacitor C25, and a 26th capacitor C26, which are connected in parallel and their two ends are respectively connected to the secondary side pin 1 and pin 2 of the transformer T2.

[0018] Preferably, the 40.68MHz power source drive circuit further includes a second switching diode IC2, an eleventh capacitor C11, a twelfth capacitor C12, a sixteenth resistor R16, a seventeenth resistor R17, and a second variable resistor VR2. One end of the seventeenth resistor R17 is connected to pin 1 of the primary side of the transformer T1. The second switching diode IC2, the twelfth capacitor C12, and the second variable resistor VR2 are connected in parallel, with one end connected to the seventeenth resistor R17. The eleventh capacitor C11 and the sixteenth resistor R16 are connected in parallel, with one end connected to the second variable resistor VR2 and the fifteenth resistor R15.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] This invention employs a compact component layout and short interconnect design to reduce the area of ​​high-frequency current loops in the circuit, thereby reducing spike interference and heat generation. Simultaneously, it utilizes a transformer-coupled amplifier circuit and a Class B push-pull amplifier circuit to obtain a sine wave output with low harmonic components and low parasitic noise. By mounting all components on a printed circuit board and arranging them rationally, this invention achieves short interconnects and no crossovers, resulting in a perfect on-power sine wave output within the 40MHz frequency range, thus improving the reliability and stability of the circuit. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a 40.68MHz power source drive circuit according to the present invention. Detailed Implementation

[0023] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0024] This utility model provides the following technical solution:

[0025] A 40.68MHz power source drive circuit includes a transformer-coupled amplifier circuit, a transformer T1, and a Class B push-pull amplifier circuit. The transformer-coupled amplifier circuit is connected to the primary side of the transformer T1, and the secondary side of the transformer T1 is connected to the Class B push-pull amplifier circuit. The transformer-coupled amplifier circuit is the first-stage amplifier circuit, and the Class B push-pull amplifier circuit is the second-stage amplifier circuit.

[0026] The transformer-coupled amplifier circuit includes a first connection port CN1, a second resistor R2 (39Ω), a first capacitor C1 (100nF), a first MOSFET Q1, a third connection port CN3, a fifth resistor R5 (100Ω), an eighth resistor R8 (1.2KΩ), a tenth resistor R10 (5.1KΩ), and a first variable resistor VR1 (with a maximum resistance of 5KΩ).

[0027] Pin 1 of the first connection port CN1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is connected to the gate of the first MOS transistor Q1.

[0028] The third connection port CN3 is a 24V / 6.3A power supply that powers the transformer-coupled amplifier circuit. Pin 1 of the third connection port CN3 is connected to one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to pin 3 of the first variable resistor VR1, pin 2 of the first variable resistor VR1 is connected to one end of the eighth resistor R8, the other end of the eighth resistor R8 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected to the gate of the first MOSFET Q1.

[0029] Pin 1 of the third connection port CN3 is connected to an external DC power supply, and is connected to the drain of the first MOSFET Q1 through the secondary side of transformer T1.

[0030] The transformer-coupled amplifier circuit also includes a first resistor R1, a third resistor R3, and a fourth resistor R4. One end of the first resistor R1 is connected to pin 1 of the first connection port CN1, and the other end of the first resistor R1 is connected to the source of the first MOS transistor Q1.

[0031] The transformer-coupled amplifier circuit also includes a sixth resistor R6 (6.8KΩ), a seventh resistor R7 (680Ω), a ninth resistor R9 (100KΩ), a second capacitor C2 (2.2nF), a third capacitor C3 (100nF), a fourth capacitor C4 (215nF), a fifth capacitor C5 (100nF), a sixth capacitor C6 (100nF), a twenty-ninth capacitor C29 (215nF), a thirtieth capacitor C30 (100nF), and a first switching diode IC1;

[0032] The 30th capacitor C30 and the 29th capacitor C29 are connected in parallel and are respectively connected to pin 1 and pin 2 of the third connection port CN3. One end of the fifth capacitor C5 is connected to pin 2 of the third connection port CN3, and the other end of the fifth capacitor C5 is connected to pin 2 of the first variable resistor VR1. The ninth resistor R9 is connected in parallel with the fifth capacitor C5. One end of the third capacitor C3 is connected to pin 2 of the third connection port CN3, and the other end of the third capacitor C3 is connected to the connection point of the fifth resistor R5 and the eighth resistor R8. One end of the sixth resistor R6 is connected to pin 2 of the third connection port CN3, and the other end of the sixth resistor R6 is connected to the gate of the first MOSFET Q1. The sixth capacitor C6 and the first switching diode IC1 are connected in parallel with the first variable resistor VR1.

[0033] One end of the seventh resistor R7 is connected to the gate of the first MOSFET Q1, and the other end of the seventh resistor R7 is connected to one end of the second capacitor C2. The other end of the second capacitor C2 is connected to pin 2 of the primary side of the transformer T1, and the fourth capacitor C4 is connected to pin 1 of the primary side of the transformer T1.

[0034] The Class B push-pull amplifier circuit includes the following resistors: eleventh resistor R11 (51Ω), twelfth resistor R12 (51Ω), thirteenth resistor R13 (680Ω), fourteenth resistor R14 (680Ω), fifteenth resistor R1 (4.7KΩ), seventh capacitor C7, eighth capacitor C8 (2.2nF), ninth capacitor C9 (2.2nF), tenth capacitor C10, second MOSFET Q2, and third MOSFET Q3.

[0035] Pin 4 of the secondary side of transformer T1 is connected to one end of the thirteenth resistor R13. The other end of the thirteenth resistor R13 is connected to one end of the eighth capacitor C8. The other end of the eighth capacitor C8 is connected to the drain of the second MOSFET Q2. One end of the eleventh resistor R11 is connected to pin 4 of the secondary side of transformer T1. The other end of the eleventh resistor R11 is connected to one end of the twelfth resistor R12 and the fifteenth resistor R15. The other end of the twelfth resistor R12 is connected to pin 3 of the secondary side of transformer T1. One end of the tenth capacitor C10 is connected to the... The connection point of resistor eleven (R11) and resistor twelfth (R12) is connected. The other end of capacitor ten (C10) is connected to the source of MOSFET two (Q2). The gate of MOSFET three (Q3) is connected to pin 3 of the secondary side of transformer T1. The drain of MOSFET three (Q3) is connected to the source of MOSFET two (Q2). The source of MOSFET three (Q3) is connected to one end of capacitor nine (C9). The other end of capacitor nine (C9) is connected to one end of resistor fourteen (R14). The other end of resistor fourteen (R14) is connected to pin 3 of the secondary side of transformer T1.

[0036] The Class B push-pull amplifier circuit also includes capacitor C22 (100nF), capacitor C23 (215nF), capacitor C27 (200nF), capacitor C28 (6.8μF), and a fourth connection port CN4. The capacitors C22, C23, C27, and C28 are connected in parallel and one end is connected to the fourth connection port CN4.

[0037] The Class B push-pull amplifier circuit also includes capacitors C13 (13th), C14 (14th), C15 (15th), C16 (16th), C17 (17th), C18 (18th), C19 (19th), C20 (20th), C21 (21st), and transformer T2. C13, C14, and C15 are connected in parallel with one end connected to pin 5 of the primary winding of transformer T2. C19, C20, and C21 are connected in parallel with one end connected to pin 5 of the primary winding of transformer T2. C16, C17, and C18 are connected in parallel with one end connected to pin 3 of the primary winding of transformer T2.

[0038] The Class B push-pull amplifier circuit of the transformer also includes capacitors C24 (24th), C25 (25th), and C26 (26th, 100pF). These capacitors are connected in parallel and their two ends are connected to pin 1 and pin 2 of the secondary side of transformer T2, respectively.

[0039] The 40.68MHz power source drive circuit also includes a second switching diode IC2, an eleventh capacitor C11 (100nF), a twelfth capacitor C12 (100nF), a sixteenth resistor R16 (100KΩ), a seventeenth resistor R17 (5.1KΩ), and a second variable resistor VR2 (maximum resistance value 5KΩ). One end of the seventeenth resistor R17 is connected to pin 1 of the primary side of transformer T1. The second switching diode IC2, the twelfth capacitor C12, and the second variable resistor VR2 are connected in parallel, with one end connected to the seventeenth resistor R17. The eleventh capacitor C11 and the sixteenth resistor R16 are connected in parallel, with one end connected to the second variable resistor VR2 and the fifteenth resistor R15.

[0040] A sinusoidal input signal is input through the first connection port CN1, passes through the second resistor R2 and the first capacitor C1, and is then connected to the gate of the Q1 field-effect transistor. Pin 1 of the third connection port CN3 is connected to an external DC power supply, which is connected to the drain of the field-effect transistor Q1 through transformer T1, supplying power to the transformer-coupled amplifier circuit. Pin 1 of the third connection port CN3 is connected to the gate of the first MOSFET Q1 through the tenth resistor R10, the first variable resistor VR1, the eighth resistor R8, and the fifth resistor R5 to provide a bias voltage. The amplified signal is then connected to the second-stage amplifier circuit through transformer T1. The signal from the first stage is transmitted to the gates of the second MOSFET Q2 and the third MOSFET Q3 through the T1 coupling transformer. MOSFET Q3 consists of two identical field-effect transistors. Pin 1 of the third connection port CN3 is connected to the gates of the second MOSFET Q2 and the third MOSFET Q3 via resistors R17 (seventeenth), VR2 (second), and R15 (fifteenth), and then to resistors R11 (eleventh) and R12 (twelfth) to provide bias voltage. The fourth connection port CN4 is an external 24V / 17A DC power supply. It is connected to the drain of the second MOSFET Q2 via pins 4 and 5 of transformer T2, and to the drain of the third MOSFET Q3 via pins 4 and 3 of transformer T2, thus powering the second-stage amplifier circuit. The amplified signal is then transmitted to the second connection port CN2 and output via the T2 coupling transformer.

[0041] When a sine wave signal is input to the first connection CN1, an amplified signal with opposite polarity will be obtained in the secondary circuit of transformer T1. This signal causes the second MOSFET Q2 and the third MOSFET Q3 to conduct alternately within one cycle.

[0042] In this embodiment, all components are on a printed circuit board. The first connection port CN1 and the second connection port CN2 are coaxial cable interfaces; the third connection port CN3 is a 2-2.54 segment socket; the fourth connection port CN4 is a surface-mount stud; the first variable resistor VR1 and the second variable resistor VR2 are adjustable resistors; IC1 and IC2 are switching diodes; and transformers T1 and T2 are wire-wound inductors. The first MOSFET Q1, the second MOSFET Q2, and the third MOSFET Q3 are N-channel field-effect transistors. The second capacitor C2 and the seventh resistor R7 are connected in series between the gate and drain of the first MOSFET Q1; the eighth capacitor C6 and the thirteenth resistor R13 are connected in series between the gate and drain of the second MOSFET Q2; and the ninth capacitor C9 and the fourteenth resistor R14 are connected in series between the gate and drain of the third MOSFET Q3, primarily to remove waveform spikes.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A 40.68MHz power source drive circuit, characterized in that, It includes a transformer-coupled amplifier circuit, a transformer T1, and a Class B push-pull amplifier circuit; the transformer-coupled amplifier circuit is connected to the primary side of the transformer T1, and the secondary side of the transformer T1 is connected to the Class B push-pull amplifier circuit.

2. The 40.68MHz power source drive circuit according to claim 1, characterized in that, The transformer-coupled amplifier circuit includes a first connection port CN1, a second resistor R2, a first capacitor C1, a first MOSFET Q1, a third connection port CN3, a fifth resistor R5, an eighth resistor R8, a tenth resistor R10, and a first variable resistor VR1. Pin 1 of the first connection port CN1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is connected to the gate of the first MOS transistor Q1. Pin 1 of the third connection port CN3 is connected to one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to pin 3 of the first variable resistor VR1, pin 2 of the first variable resistor VR1 is connected to one end of the eighth resistor R8, the other end of the eighth resistor R8 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected to the gate of the first MOS transistor Q1. Pin 1 of the third connection port CN3 is connected to an external DC power supply, and is connected to the drain of the first MOS transistor Q1 through the secondary side of the transformer T1.

3. The 40.68MHz power source drive circuit according to claim 2, characterized in that, The transformer-coupled amplifier circuit further includes a first resistor R1, a third resistor R3, and a fourth resistor R4. One end of the first resistor R1 is connected to pin 1 of the first connection port CN1, and the other end of the first resistor R1 is connected to the source of the first MOS transistor Q1.

4. The 40.68MHz power source drive circuit according to claim 3, characterized in that, The transformer-coupled amplifier circuit also includes a sixth resistor R6, a seventh resistor R7, a ninth resistor R9, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a twenty-ninth capacitor C29, a thirtieth capacitor C30, and a first switching diode IC1. The thirtieth capacitor C30 and the twenty-ninth capacitor C29 are connected in parallel and are respectively connected to pin 1 and pin 2 of the third connection port CN3. One end of the fifth capacitor C5 is connected to pin 2 of the third connection port CN3, and the other end of the fifth capacitor C5 is connected to pin 2 of the first variable resistor VR1. The ninth resistor R9 is connected in parallel with the fifth capacitor C5. One end of the third capacitor C3 is connected to pin 2 of the third connection port CN3, and the other end of the third capacitor C3 is connected to the connection point of the fifth resistor R5 and the eighth resistor R8. One end of the sixth resistor R6 is connected to pin 2 of the third connection port CN3, and the other end of the sixth resistor R6 is connected to the gate of the first MOS transistor Q1. The sixth capacitor C6 and the first switching diode IC1 are connected in parallel with the first variable resistor VR1. One end of the seventh resistor R7 is connected to the gate of the first MOS transistor Q1, the other end of the seventh resistor R7 is connected to one end of the second capacitor C2, the other end of the second capacitor C2 is connected to pin 2 of the primary side of the transformer T1, and the fourth capacitor C4 is connected to pin 1 of the primary side of the transformer T1.

5. The 40.68MHz power source drive circuit according to claim 1, characterized in that, The transformer class B push-pull amplifier circuit includes an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, a second MOSFET Q2, and a third MOSFET Q3. Pin 4 of the secondary side of transformer T1 is connected to one end of the thirteenth resistor R13. The other end of the thirteenth resistor R13 is connected to one end of the eighth capacitor C8. The other end of the eighth capacitor C8 is connected to the drain of the second MOSFET Q2. One end of the eleventh resistor R11 is connected to pin 4 of the secondary side of transformer T1. The other end of the eleventh resistor R11 is connected to one end of the twelfth resistor R12 and the fifteenth resistor R15. The other end of the twelfth resistor R12 is connected to pin 3 of the secondary side of transformer T1. One end of the tenth capacitor C10 is connected to... The connection points of the eleventh resistor R11 and the twelfth resistor R12 are connected. The other end of the tenth capacitor C10 is connected to the source of the second MOSFET Q2. The gate of the third MOSFET Q3 is connected to the secondary pin 3 of the transformer T1. The drain of the third MOSFET Q3 is connected to the source of the second MOSFET Q2. The source of the third MOSFET Q3 is connected to one end of the ninth capacitor C9. The other end of the ninth capacitor C9 is connected to one end of the fourteenth resistor R14. The other end of the fourteenth resistor R14 is connected to the secondary pin 3 of the transformer T1.

6. The 40.68MHz power source drive circuit according to claim 5, characterized in that, The transformer class B push-pull amplifier circuit also includes a 22nd capacitor C22, a 23rd capacitor C23, a 27th capacitor C27, a 28th capacitor C28, and a fourth connection port CN4. The 22nd capacitor C22, the 23rd capacitor C23, the 27th capacitor C27, and the 28th capacitor C28 are connected in parallel and one end is connected to the fourth connection port CN4.

7. The 40.68MHz power source drive circuit according to claim 6, characterized in that, The Class B push-pull amplifier circuit of the transformer also includes a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-first capacitor C21, and a transformer T2. The thirteenth capacitor C13, the fourteenth capacitor C14, and the fifteenth capacitor C15 are connected in parallel, with one end connected to the primary side pin 5 of the transformer T2. The nineteenth capacitor C19, the twentieth capacitor C20, and the twenty-first capacitor C21 are connected in parallel, with one end connected to the primary side pin 5 of the transformer T2. The sixteenth capacitor C16, the seventeenth capacitor C17, and the eighteenth capacitor C18 are connected in parallel, with one end connected to the primary side pin 3 of the transformer T2.

8. The 40.68MHz power source drive circuit according to claim 7, characterized in that, The transformer class B push-pull amplifier circuit also includes capacitors C24 (24th), C25 (25th), and C26 (26th), which are connected in parallel and their two ends are respectively connected to pin 1 and pin 2 of the secondary side of transformer T2.

9. A 40.68MHz power source drive circuit according to claim 8, characterized in that, The 40.68MHz power source drive circuit also includes a second switching diode IC2, an eleventh capacitor C11, a twelfth capacitor C12, a sixteenth resistor R16, a seventeenth resistor R17, and a second variable resistor VR2. One end of the seventeenth resistor R17 is connected to pin 1 of the primary side of transformer T1. The second switching diode IC2, the twelfth capacitor C12, and the second variable resistor VR2 are connected in parallel, with one end connected to the seventeenth resistor R17. The eleventh capacitor C11 and the sixteenth resistor R16 are connected in parallel, with one end connected to the second variable resistor VR2 and the fifteenth resistor R15.

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