Frequency-adjustable high-frequency alternating-current output transformer-free power amplification circuit

Abstract

The utility model discloses a frequency-adjustable high-frequency alternating-current output transformer-free power amplification circuit, and relates to the technical field of capacitor ripple current durability life tests. Comprising a positive and negative dual-power module, a same-direction power amplification module and a reverse-direction power amplification module, the same-direction power amplification module and the reverse-direction power amplification module are correspondingly connected with power amplifier driver modules respectively, the output end OUT of the same-direction power amplification module is connected with one end of an air-core inductor L1, and the output end OUT of the reverse-direction power amplification module is connected with one end of an air-core inductor L2. The other ends of the hollow inductor L1 and the hollow inductor L2 are respectively used as an output terminal 1 and an output terminal 2, a capacitor C42 is connected in parallel between the hollow inductor L1 and the hollow inductor L2, and capacitors C43 and C44 which are connected in series are connected between the output terminal 1 and the output terminal 2. According to the utility model, two groups of input signals are input together, so that two groups of NPN and PNP triodes are respectively and simultaneously crossed, conducted and output, and compared with a half-bridge power amplifier module with one group of input signals and mutual conduction of the triodes NPN and PNP, the output efficiency is improved by 2-3 times.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitor ripple current durability life test, in particular to a frequency-adjustable high-frequency AC output transformerless power amplifier circuit. Background Art

[0002] Capacitors are an essential component of various electronic devices, serving as smoothing filters for rectifiers, decoupling power supplies, bypassing AC signals, and coupling AC and DC circuits. Due to their diverse usage scenarios, capacitors of various materials and characteristics have emerged, including mica, ceramic, paper, and electrolytic capacitors. Therefore, it's crucial to understand not only the performance indicators and general characteristics of various capacitor types, but also the strengths and weaknesses of each component for a given application.

[0003] Capacitor ripple current endurance life tests are conducted to evaluate the long-term stability and durability of capacitors. These tests typically include voltage withstand tests, heat tests, and temperature and humidity cycle tests to assess capacitor performance in extreme environments. Accelerated life tests accelerate the aging process under multiple stress conditions, such as high temperature, high voltage, and high current, to predict the lifespan of capacitors under normal operating conditions.

[0004] The capacitor ripple current durability life test power supply commonly used in the market currently has an adjustable frequency range of generally 1Ok-100KHz. It adopts positive and negative dual power supply, and the Class B power amplifier NPN and PNP parameters are consistent, complementary and symmetrical, with an output transformer. The ideal efficiency is 78.5%. Because the output transformer method causes the frequency range of the equipment to be limited, and the power utilization rate of this circuit is not high, only half of the cycle works in a cycle, resulting in low output efficiency. Utility Model Content

[0005] The purpose of this utility model is to provide a frequency-adjustable high-frequency AC output transformerless power amplifier circuit, which effectively improves the power supply efficiency under the same positive and negative power supply conditions, making the output efficiency 2 to 3 times the original, and cancels the output transformer design to further expand the output frequency range to 1k-200k.

[0006] The technical solution for achieving the above-mentioned purpose is: a frequency-adjustable high-frequency AC output transformerless power amplifier circuit, characterized in that: it includes a positive and negative dual power supply module, a unidirectional power amplifier module electrically connected to the positive and negative dual power supply module, a reverse power amplifier module, an air-core inductor L1, and an air-core inductor L2, the unidirectional power amplifier module and the reverse power amplifier module are respectively connected to a power amplifier driver module, the output end OUT of the unidirectional power amplifier module is connected to one end of the air-core inductor L1, the output end OUT of the reverse power amplifier module is connected to one end of the air-core inductor L2, the other ends of the air-core inductor L1 and the air-core inductor L2 serve as output terminal 1 and output terminal 2, and a capacitor C42 is connected in parallel therebetween, capacitors C43 and C44 are connected in series between the output terminal 1 and the output terminal 2, the connection between the capacitors C43 and C44 is simultaneously grounded, the two ends of the air-core inductor L1 are also respectively connected in parallel with a resistor R43, and the two ends of the air-core inductor L2 are also respectively connected in parallel with a resistor R44.

[0007] Furthermore, the positive and negative dual power supply module includes an AC power supply, a transformer, and electrolytic capacitors C40 and C41. The input end of the transformer is connected to 220V AC power, the output end of the transformer is connected to the input end of the rectifier bridge, the positive pole of the output end of the rectifier bridge is connected to the positive pole of the electrolytic capacitor C40 and serves as the power output VCC, the negative pole of the electrolytic capacitor C40, the positive pole of C41, and the middle tap of the transformer T1 are connected in parallel as the power output GND, and the negative pole of the electrolytic capacitor C41 is connected to the negative pole of the output end of the rectifier bridge and serves as the power output VEE.

[0008] Furthermore, a fuse and a relay are connected in series between the 220V AC power and the transformer, and a current-limiting resistor R40 is connected in parallel at both ends of the relay.

[0009] Furthermore, the power amplifier driver module includes a power amplifier IC chip U1, resistors R41, R42, a triode Q40, capacitors C42, C43, a single-row pin JX1, and a single-row pin JX2. The power amplifier IC chip U1 adopts an IC chip model: UPC1342. The normal operating voltage range of this chip is ±25V~±52V, the driving power is 50W~110W, and the center voltage offset is less than 50mv.

[0010] Pins 1 and 2 of the power amplifier IC chip U1 are connected in parallel and electrically connected to the socket JX1-1 of the single-row pin JX1. Pin 3 of the power amplifier IC chip U1 is electrically connected to the sockets JX1-2, JX1-3, and JX1-4 of the single-row pin JX1 and grounded. Pin 3 of the power amplifier IC chip U1 is also connected to one end of a resistor R41, and the other end of the resistor R41 is grounded.

[0011] Pin 4 of the power amplifier IC chip U1 is electrically connected to the socket JX1-5 of the single-row pin JX1, pin 5 of the power amplifier IC chip U1 is electrically connected to the socket JX2-6 of the single-row pin JX2, pin 6 of the power amplifier IC chip U1 is electrically connected to the socket JX1-6 of the single-row pin JX1, and pin 7 of the power amplifier IC chip U1 is electrically connected to the socket JX1-7 of the single-row pin JX1 and the socket JX2-4 of the single-row pin JX2, respectively. A capacitor C42 is also connected between pins 6 and 7 of the power amplifier IC chip U1.

[0012] Pin 8 of the power amplifier IC chip U1 is connected to the collector of the transistor Q40, the base of the transistor Q40 is electrically connected to the socket JX2-3 of the single-row pin JX2, and the emitter of the transistor Q40 is electrically connected to pin 7 of the power amplifier IC chip U1 and the socket JX2-4 of the single-row pin JX2. Pin 8 of the power amplifier IC chip U1 is also connected to one end of the resistor R42, and the other end of the resistor R42 is electrically connected to the socket JX2-5 of the single-row pin JX2.

[0013] Pins 9 and 10 of the power amplifier IC chip U1 are connected in parallel and electrically connected to the socket JX1-8 of the single-row pin JX1. Pin 11 of the power amplifier IC chip U1 is electrically connected to the socket JX2-2 of the single-row pin JX2. Pin 12 of the power amplifier IC chip U1 is electrically connected to the socket JX2-1 of the single-row pin JX2. A capacitor C43 is connected between pins 11 and 12 of the power amplifier IC chip U1.

[0014] Furthermore, the same-direction power amplifier module and the reverse power amplifier module are the same, including an external power supply VCC1, an external power supply VEE1, a signal input terminal JX3, electrolytic capacitors C1, C6, capacitors C2, C3, C4, C30, C31, a trimmer potentiometer RW1, a resistor R100, a resistor R101, resistors R1, R2, R3, R5, and a single-row female JX1 plugged with a single-row pin JX1. 4. Single-row female JX5 that mates with single-row pin JX2, transistors Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15, Q16, Q17, Q18, Q19, Q20, Q21, Q22, Q23, Q24, Q25, Q26, resistor R100, resistor R101, resistor R12, resistor R13, resistor R14, resistor R15, resistor R16, resistor R17, resistor R18, resistor R19, resistor R20, resistor R21, resistor R22, resistor R23, resistor R24, resistor R25, resistor R26, resistor R27, resistor R28, resistor R29, resistor R30, resistor R31, resistor R32, resistor R33, resistor R34, resistor R36, resistor R36, resistor R38, resistor R39, resistor R40, resistor R41, resistor R42, resistor R43, resistor R44, resistor R45, resistor R46, resistor R47, resistor R48, resistor R49, resistor R6, resistor R7, resistor R8, resistor R9, resistor R54, resistor R55, resistor R56, resistor R57, resistor R58, resistor R59, resistor R60, resistor R61;

[0015] Among them, transistors Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, and Q13 are NPN transistors, and transistors Q14, Q15, Q16, Q17, Q18, Q19, Q20, Q21, Q22, Q23, Q24, Q25, and Q26 are PNP transistors;

[0016] The socket JX4-1 of the single-row female JX4 is respectively connected to the power output VCC and one end of the resistor R100, the other end of the resistor R100 is connected to the external power supply VCC1, the socket JX4-2 of the single-row female JX4 is connected to the negative electrode of the electrolytic capacitor C1, and the positive electrode of the electrolytic capacitor C1 is connected to the power output VCC, the sockets JX4-3 and JX4-3 of the single-row female JX4 are connected in parallel and grounded, and the socket JX4-5 of the single-row female JX4 is respectively connected to the resistors R1, R2, and the capacitor C 3, the other ends of resistor R2 and capacitor C3 are grounded, the other end of resistor R1 is connected in series with capacitor C2 and then connected to interface JX3-3 of signal input wiring terminal JX3, interface JX3-1 of signal input wiring terminal JX3 is grounded, capacitor C4 is connected between sockets JX4-6 and JX4-7 of single-row female JX4, socket JX4-8 of single-row female JX4 is connected in series with resistor R101 and then connected to external power supply VEE1, and JX4-8 is connected to power output VEE;

[0017] The socket JX5-1 of the single-row female JX5 is connected to one end of the resistors R110 and R12 respectively, the socket JX5-2 of the single-row female JX5 is connected to one end of the resistors R111 and R61 respectively, the other ends of the resistors R110 and R111 are connected in parallel, the socket JX5-3 of the single-row female JX5 is connected to pin 1 of the fine-tuning potentiometer, the socket JX5-4 of the single-row female JX5 is connected to pin 3 of the fine-tuning potentiometer, the socket JX5-5 of the single-row female JX5 is connected to pin 2 of the fine-tuning potentiometer, the socket JX5-6 of the single-row female JX5 is connected to one end of the resistor R3 and the resistor R5 at the same time, the other end of the resistor R3 is connected to the positive electrode of the capacitor C6, the negative electrode of the capacitor C6 is connected to GND, the other end of the resistor R5 is connected to the connection end between R110 and R111 at the same time, and the socket JX5-7 of the single-row female JX5 is connected to GND;

[0018] The other end of resistor R12 is connected to the base of transistor Q1, capacitor C30 is connected between the base and collector of transistor Q1, the collector of transistor Q1 is also connected to the external power supply VCC1, the emitter of transistor Q1 is respectively connected to one end of resistors R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, and R24; the other end of resistor R15 is connected to the base of transistor Q2, the collector of transistor Q2 is connected to the external power supply VCC1, and the emitter of transistor Q2 is connected to one end of resistor R25; the other end of resistor R16 The base of transistor Q3 is connected, the collector of transistor Q3 is connected to the external power supply VCC1, and the emitter of transistor Q3 is connected to one end of resistor R26; the other end of resistor R17 is connected to the base of transistor Q4, the collector of transistor Q4 is connected to the external power supply VCC1, and the emitter of transistor Q4 is connected to one end of resistor R27; the other end of resistor R18 is connected to the base of transistor Q5, the collector of transistor Q5 is connected to the external power supply VCC1, and the emitter of transistor Q5 is connected to one end of resistor R28; the other end of resistor R21 is connected to the base of transistor Q6, the collector of transistor Q6 is connected to the external power supply VCC1, and the emitter of transistor Q6 is connected Connect one end of resistor R29; the other end of resistor R19 is connected to the base of transistor Q7, the collector of transistor Q7 is connected to the external power supply VCC1, and the emitter of transistor Q7 is connected to one end of resistor R30; the other end of resistor R22 is connected to the base of transistor Q8, the collector of transistor Q8 is connected to the external power supply VCC1, and the emitter of transistor Q8 is connected to one end of resistor R31; the other end of resistor R23 is connected to the base of transistor Q9, the collector of transistor Q9 is connected to the external power supply VCC1, and the emitter of transistor Q9 is connected to one end of resistor R32; the other end of resistor R24 is connected to the base of transistor Q10, the collector of transistor Q10 is connected to the external power supply VCC1, and the emitter of transistor Q9 is connected to one end of resistor R32. Connected to the external power supply VCC1, the emitter of transistor Q10 is connected to one end of resistor R33; the other end of resistor R13 is connected to the base of transistor Q11, the collector of transistor Q11 is connected to the external power supply VCC1, and the emitter of transistor Q11 is connected to one end of resistor R34; the other end of resistor R14 is connected to the base of transistor Q12, the collector of transistor Q12 is connected to the external power supply VCC1, and the emitter of transistor Q12 is connected to one end of resistor R35; the other end of resistor R20 is connected to the base of transistor Q13, the collector of transistor Q12 is connected to the external power supply VCC1, and the emitter of transistor Q12 is connected to one end of resistor R36;

[0019] The other ends of resistors R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R36, and R37 are connected in parallel to serve as the output ends OUT of the resistors of the same-direction power amplifier module and the reverse power amplifier module;

[0020] The other end of the resistor R61 is connected to the base of the transistor Q26, the capacitor C31 is connected between the base and the collector of the transistor Q26, and the collector of the transistor Q26 is also connected to the external power supply VEE1;

[0021] The emitter of transistor Q26 is connected to one end of resistors R59, R60, R49, R50, R51, R52, R53, R54, R55, R56, R57, and R58, respectively; the other end of resistor R59 is connected to the base of transistor Q14, the collector of transistor Q14 is connected to the external power supply VEE1, and the emitter of transistor Q14 is connected to one end of resistor R37; the other end of resistor R60 is connected to the base of transistor Q15, the collector of transistor Q15 is connected to the external power supply VEE1, and the emitter of transistor Q15 is connected to one end of resistor R38; the other end of resistor R49 is connected to the base of transistor Q16. The base and collector of transistor Q16 are connected to the external power supply VEE1, and the emitter of transistor Q16 is connected to one end of resistor R39; the other end of resistor R50 is connected to the base of transistor Q17, the collector of transistor Q17 is connected to the external power supply VEE1, and the emitter of transistor Q17 is connected to one end of resistor R40; the other end of resistor R51 is connected to the base of transistor Q18, the collector of transistor Q18 is connected to the external power supply VEE1, and the emitter of transistor Q18 is connected to one end of resistor R41; the other end of resistor R52 is connected to the base of transistor Q19, the collector of transistor Q19 is connected to the external power supply VEE1, and the emitter of transistor Q19 is connected to one end of resistor R42;

[0022] The other end of resistor R53 is connected to the base of transistor Q20, the collector of transistor Q20 is connected to the external power supply VEE1, and the emitter of transistor Q20 is connected to one end of resistor R43; the other end of resistor R54 is connected to the base of transistor Q21, the collector of transistor Q21 is connected to the external power supply VEE1, and the emitter of transistor Q21 is connected to one end of resistor R44; the other end of resistor R55 is connected to the base of transistor Q22, the collector of transistor Q22 is connected to the external power supply VEE1, and the emitter of transistor Q22 is connected to one end of resistor R45; The other end of resistor R56 is connected to the base of transistor Q23, the collector of transistor Q23 is connected to the external power supply VEE1, and the emitter of transistor Q23 is connected to one end of resistor R46; the other end of resistor R57 is connected to the base of transistor Q24, the collector of transistor Q24 is connected to the external power supply VEE1, and the emitter of transistor Q24 is connected to one end of resistor R47; the other end of resistor R58 is connected to the base of transistor Q25, the collector of transistor Q25 is connected to the external power supply VEE1, and the emitter of transistor Q25 is connected to one end of resistor R48;

[0023] The other ends of the resistors R37 , R38 , R39 , R40 , R41 , R42 , R43 , R44 , R45 , R46 , R47 , and R48 are connected in parallel and to the output terminal OUT.

[0024] Furthermore, the same-direction power amplification module and the reverse power amplification module also include a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C20, a capacitor C21, a capacitor C22, and a capacitor C23. One ends of the resistors R6, R7, R8, and R9 are connected in parallel and connected to the output end OUT, the other ends of the resistors R6 and R7 are connected in parallel and connected to one end of the capacitors C20 and C21, the other ends of the resistors R8 and R9 are connected in parallel and connected to one end of the capacitors C22 and C23, and the other ends of the capacitors C20, C21, C22, and C23 are grounded.

[0025] The beneficial effects of the present invention: Since two groups of input signals are input together, the present invention enables two groups of NPN and PNP transistors to cross-conduct and output at the same time. Compared with the half-bridge power amplifier module with one group of signal input, the transistors NPN and PNP are mutually conductive, and the output efficiency is improved by 2~3 times. The frequency range of a general high-frequency transformer is 10K~50KHz. When the frequency exceeds 50KHz, the loss generated by the transformer will increase initially, which forces us to amplify the output power margin during design to cope with the loss generated by the transformer. However, this solution will be insufficient at higher frequencies. Therefore, the present invention cancels the transformer and ensures the stability of the circuit by adding an RLC combination network circuit. The frequency range is increased from the original 10K~100KHz to 1k~200KHz. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the utility model;

[0027] Figure 2 This is the circuit diagram of the power amplifier driver module;

[0028] Figure 3 The circuit diagram of the same direction power amplifier module and the reverse power amplifier module;

[0029] Figure 4 for Figure 3 Enlarged view of part A in the middle;

[0030] Figure 5 for Figure 3 Enlarged view of the middle part B;

[0031] Figure 6 for Figure 3 Enlarged view of the middle C section;

[0032] Figure 7 for Figure 3 Enlarged view of the middle D part; DETAILED DESCRIPTION

[0033] like Figure 1-7 As shown, the utility model discloses a frequency-adjustable high-frequency AC output transformerless power amplifier circuit, including a positive and negative dual power supply module 1, a same-direction power amplifier module 2 electrically connected to the positive and negative dual power supply module 1, a reverse power amplifier module 3, an air-core inductor L1, and an air-core inductor L2. The same-direction power amplifier module 2 and the reverse power amplifier module 3 are respectively connected to a power amplifier driver module 4.

[0034] The positive and negative dual power supply module includes a 220V AC power supply, a transformer T1, and electrolytic capacitors C40 and C41. The input end of the transformer T1 is connected to the 220V AC power supply, and the output end of the transformer T1 is connected to the input end of the rectifier bridge B. A fuse FU and a relay J1 are connected in series between the transformer T1 and the live wire of the 220V AC power supply. A current-limiting resistor R40 is connected in parallel at both ends of the relay J1.

[0035] The positive pole of the output end of the rectifier bridge is connected to the positive pole of the electrolytic capacitor C40 and serves as the power output VCC. The negative pole of the electrolytic capacitor C40, the positive pole of C41, and the center tap of the transformer T1 are connected in parallel as the power output GND. The negative pole of the electrolytic capacitor C41 is connected to the negative pole of the output end of the rectifier bridge and serves as the power output VEE. The electrolytic capacitors C40 and C41 are used for power supply filtering.

[0036] When the positive and negative dual power supply module is working, the 220V AC power supply is rectified and filtered by the rectifier bridge B to become DC power. At the moment of power-on, the relay J1 is normally open, and the electrolytic capacitors C40 and C41 are slowly charged through the current limiting resistor R40. After 2 seconds, the relay J1 is controlled to be closed (the control of the relay J1 belongs to the existing conventional technology, for example, it can be controlled by a single-chip microcomputer, which will not be elaborated) to obtain the required voltage. The current limiting resistor R40 and the relay J1 play the role of soft start of the equipment. This power supply has high output stability and low noise, which provides a guarantee for the stable output of the subsequent same-direction power amplifier module 2 and the reverse power amplifier module 2.

[0037] The power amplifier driver module 4 includes a power amplifier IC chip U1, resistors R41, R42, a triode Q40, capacitors C42, C43, a single-row pin JX1, and a single-row pin JX2. The power amplifier IC chip U1 adopts an IC chip model: UPC1342. The normal operating voltage range of this chip is ±25V~±52V, the driving power is 50W~110W, and the center voltage offset is less than 50mv.

[0038] Pins 1 and 2 of the power amplifier IC chip U1 are connected in parallel and electrically connected to the socket JX1-1 of the single-row pin JX1. Pin 3 of the power amplifier IC chip U1 is electrically connected to the sockets JX1-2, JX1-3, and JX1-4 of the single-row pin JX1 and grounded. Pin 3 of the power amplifier IC chip U1 is also connected to one end of a resistor R41, and the other end of the resistor R41 is grounded.

[0039] Pin 4 of the power amplifier IC chip U1 is electrically connected to the socket JX1-5 of the single-row pin JX1, pin 5 of the power amplifier IC chip U1 is electrically connected to the socket JX2-6 of the single-row pin JX2, pin 6 of the power amplifier IC chip U1 is electrically connected to the socket JX1-6 of the single-row pin JX1, and pin 7 of the power amplifier IC chip U1 is electrically connected to the socket JX1-7 of the single-row pin JX1 and the socket JX2-4 of the single-row pin JX2, respectively. A capacitor C42 is also connected between pins 6 and 7 of the power amplifier IC chip U1.

[0040] Pin 8 of the power amplifier IC chip U1 is connected to the collector of the transistor Q40, the base of the transistor Q40 is electrically connected to the socket JX2-3 of the single-row pin JX2, and the emitter of the transistor Q40 is electrically connected to pin 7 of the power amplifier IC chip U1 and the socket JX2-4 of the single-row pin JX2. Pin 8 of the power amplifier IC chip U1 is also connected to one end of the resistor R42, and the other end of the resistor R42 is electrically connected to the socket JX2-5 of the single-row pin JX2.

[0041] Pins 9 and 10 of the power amplifier IC chip U1 are connected in parallel and electrically connected to the socket JX1-8 of the single-row pin JX1. Pin 11 of the power amplifier IC chip U1 is electrically connected to the socket JX2-2 of the single-row pin JX2. Pin 12 of the power amplifier IC chip U1 is electrically connected to the socket JX2-1 of the single-row pin JX2. A capacitor C43 is connected between pins 11 and 12 of the power amplifier IC chip U1.

[0042] The sockets JX1-1 / JX1-8 of the single-row pin JX1 are the ±30V power supply terminals, the socket JX1-5 is the signal input terminal, the socket JX2-6 of the single-row pin JX2 is the feedback terminal, and the sockets JX2-1 and JX2-2 are the output terminals.

[0043] The same direction power amplifier module 2 and the reverse power amplifier module 3 are the same, including external power supply VCC1, external power supply VEE1, signal input terminal JX3, electrolytic capacitors C1, C6, capacitors C2, C3, C4, C30, C31, fine-tuning potentiometer RW1, resistor R100, resistor R101, resistors R1, R2, R3, R5, single-row female JX4 plugged with single-row needle JX1, and Single-row pin JX2 plugs into single-row female JX5, transistors Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15, Q16, Q17, Q18, Q19, Q20, Q21, Q22, Q23, Q24, Q25, Q26, resistor R100, resistor R101, resistor R12, resistor R1 3. Resistor R14, resistor R15, resistor R16, resistor R17, resistor R18, resistor R19, resistor R20, resistor R21, resistor R22, resistor R23, resistor R24, resistor R25, resistor R26, resistor R27, resistor R28, resistor R29, resistor R30, resistor R31, resistor R32, resistor R33, resistor R34, resistor R36, resistor R38, resistor R39, resistor R40, resistor R41, resistor R42, resistor R43, resistor R44, resistor R45, resistor R46, resistor R47, resistor R48, resistor R49, resistor R6, resistor R7, resistor R8, resistor R9, resistor R54, resistor R55, resistor R56, resistor R57, resistor R58, resistor R59, resistor R60, resistor R61;

[0044] Among them, transistors Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, and Q13 are NPN transistors, and transistors Q14, Q15, Q16, Q17, Q18, Q19, Q20, Q21, Q22, Q23, Q24, Q25, and Q26 are PNP transistors;

[0045] The socket JX4-1 of the single-row female JX4 is respectively connected to the power output VCC and one end of the resistor R100, the other end of the resistor R100 is connected to the external power supply VCC1, the socket JX4-2 of the single-row female JX4 is connected to the negative electrode of the electrolytic capacitor C1, and the positive electrode of the electrolytic capacitor C1 is connected to the power output VCC, the sockets JX4-3 and JX4-3 of the single-row female JX4 are connected in parallel and grounded, and the socket JX4-5 of the single-row female JX4 is respectively connected to the resistors R1, R2, and the capacitor C 3, the other ends of resistor R2 and capacitor C3 are grounded, the other end of resistor R1 is connected in series with capacitor C2 and then connected to interface JX3-3 of signal input wiring terminal JX3, interface JX3-1 of signal input wiring terminal JX3 is grounded, capacitor C4 is connected between sockets JX4-6 and JX4-7 of single-row female JX4, socket JX4-8 of single-row female JX4 is connected in series with resistor R101 and then connected to external power supply VEE1, and JX4-8 is connected to power output VEE;

[0046] The socket JX5-1 of the single-row female JX5 is connected to one end of the resistors R110 and R12 respectively, the socket JX5-2 of the single-row female JX5 is connected to one end of the resistors R111 and R61 respectively, the other ends of the resistors R110 and R111 are connected in parallel, the socket JX5-3 of the single-row female JX5 is connected to pin 1 of the fine-tuning potentiometer, the socket JX5-4 of the single-row female JX5 is connected to pin 3 of the fine-tuning potentiometer, the socket JX5-5 of the single-row female JX5 is connected to pin 2 of the fine-tuning potentiometer, the socket JX5-6 of the single-row female JX5 is connected to one end of the resistor R3 and the resistor R5 at the same time, the other end of the resistor R3 is connected to the positive electrode of the capacitor C6, the negative electrode of the capacitor C6 is connected to GND, the other end of the resistor R5 is connected to the connection end between R110 and R111 at the same time, and the socket JX5-7 of the single-row female JX5 is connected to GND;

[0047] The other end of resistor R12 is connected to the base of transistor Q1, capacitor C30 is connected between the base and collector of transistor Q1, the collector of transistor Q1 is also connected to the external power supply VCC1, the emitter of transistor Q1 is respectively connected to one end of resistors R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, and R24; the other end of resistor R15 is connected to the base of transistor Q2, the collector of transistor Q2 is connected to the external power supply VCC1, and the emitter of transistor Q2 is connected to one end of resistor R25; the other end of resistor R16 The base of transistor Q3 is connected, the collector of transistor Q3 is connected to the external power supply VCC1, and the emitter of transistor Q3 is connected to one end of resistor R26; the other end of resistor R17 is connected to the base of transistor Q4, the collector of transistor Q4 is connected to the external power supply VCC1, and the emitter of transistor Q4 is connected to one end of resistor R27; the other end of resistor R18 is connected to the base of transistor Q5, the collector of transistor Q5 is connected to the external power supply VCC1, and the emitter of transistor Q5 is connected to one end of resistor R28; the other end of resistor R21 is connected to the base of transistor Q6, the collector of transistor Q6 is connected to the external power supply VCC1, and the emitter of transistor Q6 is connected Connect one end of resistor R29; the other end of resistor R19 is connected to the base of transistor Q7, the collector of transistor Q7 is connected to the external power supply VCC1, and the emitter of transistor Q7 is connected to one end of resistor R30; the other end of resistor R22 is connected to the base of transistor Q8, the collector of transistor Q8 is connected to the external power supply VCC1, and the emitter of transistor Q8 is connected to one end of resistor R31; the other end of resistor R23 is connected to the base of transistor Q9, the collector of transistor Q9 is connected to the external power supply VCC1, and the emitter of transistor Q9 is connected to one end of resistor R32; the other end of resistor R24 is connected to the base of transistor Q10, the collector of transistor Q10 is connected to the external power supply VCC1, and the emitter of transistor Q9 is connected to one end of resistor R32. Connected to the external power supply VCC1, the emitter of transistor Q10 is connected to one end of resistor R33; the other end of resistor R13 is connected to the base of transistor Q11, the collector of transistor Q11 is connected to the external power supply VCC1, and the emitter of transistor Q11 is connected to one end of resistor R34; the other end of resistor R14 is connected to the base of transistor Q12, the collector of transistor Q12 is connected to the external power supply VCC1, and the emitter of transistor Q12 is connected to one end of resistor R35; the other end of resistor R20 is connected to the base of transistor Q13, the collector of transistor Q12 is connected to the external power supply VCC1, and the emitter of transistor Q12 is connected to one end of resistor R36;

[0048] The other ends of resistors R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R36, and R37 are connected in parallel to serve as the output ends OUT of the resistors of the same-direction power amplifier module and the reverse power amplifier module;

[0049] The other end of the resistor R61 is connected to the base of the transistor Q26, the capacitor C31 is connected between the base and the collector of the transistor Q26, and the collector of the transistor Q26 is also connected to the external power supply VEE1;

[0050] The emitter of transistor Q26 is connected to one end of resistors R59, R60, R49, R50, R51, R52, R53, R54, R55, R56, R57, and R58, respectively; the other end of resistor R59 is connected to the base of transistor Q14, the collector of transistor Q14 is connected to the external power supply VEE1, and the emitter of transistor Q14 is connected to one end of resistor R37; the other end of resistor R60 is connected to the base of transistor Q15, the collector of transistor Q15 is connected to the external power supply VEE1, and the emitter of transistor Q15 is connected to one end of resistor R38; the other end of resistor R49 is connected to the base of transistor Q16. The base and collector of transistor Q16 are connected to the external power supply VEE1, and the emitter of transistor Q16 is connected to one end of resistor R39; the other end of resistor R50 is connected to the base of transistor Q17, the collector of transistor Q17 is connected to the external power supply VEE1, and the emitter of transistor Q17 is connected to one end of resistor R40; the other end of resistor R51 is connected to the base of transistor Q18, the collector of transistor Q18 is connected to the external power supply VEE1, and the emitter of transistor Q18 is connected to one end of resistor R41; the other end of resistor R52 is connected to the base of transistor Q19, the collector of transistor Q19 is connected to the external power supply VEE1, and the emitter of transistor Q19 is connected to one end of resistor R42;

[0051] The other end of resistor R53 is connected to the base of transistor Q20, the collector of transistor Q20 is connected to the external power supply VEE1, and the emitter of transistor Q20 is connected to one end of resistor R43; the other end of resistor R54 is connected to the base of transistor Q21, the collector of transistor Q21 is connected to the external power supply VEE1, and the emitter of transistor Q21 is connected to one end of resistor R44; the other end of resistor R55 is connected to the base of transistor Q22, the collector of transistor Q22 is connected to the external power supply VEE1, and the emitter of transistor Q22 is connected to one end of resistor R45; The other end of resistor R56 is connected to the base of transistor Q23, the collector of transistor Q23 is connected to the external power supply VEE1, and the emitter of transistor Q23 is connected to one end of resistor R46; the other end of resistor R57 is connected to the base of transistor Q24, the collector of transistor Q24 is connected to the external power supply VEE1, and the emitter of transistor Q24 is connected to one end of resistor R47; the other end of resistor R58 is connected to the base of transistor Q25, the collector of transistor Q25 is connected to the external power supply VEE1, and the emitter of transistor Q25 is connected to one end of resistor R48;

[0052] The other ends of the resistors R37 , R38 , R39 , R40 , R41 , R42 , R43 , R44 , R45 , R46 , R47 , and R48 are connected in parallel and to the output terminal OUT.

[0053] The same-direction power amplifier module 2 and the reverse power amplifier module 3 also include a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C20, a capacitor C21, a capacitor C22, and a capacitor C23. One ends of the resistors R6, R7, R8, and R9 are connected in parallel and connected to the output end OUT, the other ends of the resistors R6 and R7 are connected in parallel and connected to one end of the capacitors C20 and C21, the other ends of the resistors R8 and R9 are connected in parallel and connected to one end of the capacitors C22 and C23, and the other ends of the capacitors C20, C21, C22, and C23 are grounded.

[0054] The output OUT of the same-direction power amplifier module 2 is connected to one end of the air-core inductor L1, and the output OUT of the reverse power amplifier module 3 is connected to one end of the air-core inductor L2. The other ends of the air-core inductor L1 and the air-core inductor L2 serve as the output terminal 1 and the output terminal 2, respectively, and a capacitor C42 is connected in parallel therebetween. Capacitors C43 and C44 connected in series are connected between the output terminal 1 and the output terminal 2. The connection ends between the capacitors C43 and C44 are grounded at the same time. The two ends of the air-core inductor L1 are also connected in parallel with a resistor R43, and the two ends of the air-core inductor L2 are also connected in parallel with a resistor R44.

[0055] During operation, the interfaces JX3-3 of the signal input terminal JX3 of the unidirectional power amplifier module 2 and the reverse power amplifier module 3 respectively input sine wave signals of the same frequency, opposite direction and equal magnitude, and they respectively cooperate with the power amplifier driver module 4 to realize power amplification (the two half-bridge power amplifier units are cross-connected to each other at the same time). The unidirectional power amplifier module 2 and the reverse power amplifier module 3 are both half-bridge power amplifier units. The two half-bridge power amplifier units form a full-bridge power amplifier module. The signals are respectively transmitted from the interface JX3-3 of the signal input terminal JX3 of the unidirectional power amplifier module 2 and the reverse power amplifier module 3 to the series-parallel network composed of the corresponding resistors R1, R2, capacitors C2 and C3 to eliminate the DC component and high-frequency noise, so that the high-frequency signal passes through. After amplification by the power amplifier IC chip U1, the signals are output to the base stages of the transistors Q1 and Q2 through JX2-1 and JX2-2 of the second pair of plug-in terminal blocks JX2 and JX4-1 and JX4-2 of the fourth pair of plug-in terminal blocks JX4 (resistors R12 and R61 ensure a fixed amplification factor of the transistors Q1 and Q2). The emitters of the transistors Q1 and Q2 are respectively connected to the transistors Q2~Q13 (NPN tubes) and transistors Q14~Q25 through resistors R15 and R25. The base of the transistors Q2 to Q13 (NPN transistors) and the transistors Q14 to Q25 (PNP transistors) are connected to the output terminals 1 and 2 respectively after passing through the current-sharing resistors R25 to R36 and the current-sharing resistors R37 to R48.

[0056] The outputs OUT of the common-mode power amplifier module 2 and the reverse-mode power amplifier module 3 are connected to resistors R6-R9 and capacitors C20-C23, respectively, to ground. These connections primarily absorb high-frequency spikes, prevent high-frequency self-excitation, and ensure stable operation of the amplifier circuit. High-frequency amplifier circuits are very sensitive, so RC circuits (R6-R9, C20-C22) are connected in parallel at outputs 1 and 2 for filtering. Air-core inductors L1 and L2 block high-frequency noise. Resistor R43 and air-core inductor L1, and resistor R44 and air-core inductor L2, respectively, form low-pass filters to filter out high-frequency interference. The network structure of capacitors C42, C43, and C44 enhances circuit stability and effectively reduces circuit sensitivity, making it suitable for a variety of capacitive loads.

Claims

1. A frequency-adjustable high-frequency AC output transformerless power amplifier circuit, characterized in that: It includes a positive and negative dual power supply module, a unidirectional power amplifier module electrically connected to the positive and negative dual power supply module, a reverse power amplifier module, a hollow inductor L1, and a hollow inductor L2. The unidirectional power amplifier module and the reverse power amplifier module are respectively connected to a power amplifier driver module. The output end OUT of the unidirectional power amplifier module is connected to one end of the hollow inductor L1, and the output end OUT of the reverse power amplifier module is connected to one end of the hollow inductor L2. The other ends of the hollow inductor L1 and the hollow inductor L2 serve as output terminals 1 and output terminals 2, respectively, and a capacitor C42 is connected in parallel between them. Capacitors C43 and C44 are connected in series between the output terminals 1 and 2, and the connection ends between the capacitors C43 and C44 are grounded at the same time. The two ends of the hollow inductor L1 are also connected in parallel with a resistor R43, and the two ends of the hollow inductor L2 are also connected in parallel with a resistor R44.

2. The frequency-adjustable high-frequency AC output transformerless power amplifier circuit according to claim 1, characterized in that: The positive and negative dual power supply module includes an AC power supply, a transformer, and electrolytic capacitors C40 and C41. The input end of the transformer is connected to 220V AC power, the output end of the transformer is connected to the input end of the rectifier bridge, the positive pole of the output end of the rectifier bridge is connected to the positive pole of the electrolytic capacitor C40 and serves as the power output VCC, the negative pole of the electrolytic capacitor C40, the positive pole of C41, and the center tap of the transformer T1 are connected in parallel as the power output GND, and the negative pole of the electrolytic capacitor C41 is connected to the negative pole of the output end of the rectifier bridge and serves as the power output VEE.

3. The frequency-adjustable high-frequency AC output transformerless power amplifier circuit according to claim 2, characterized in that: A fuse and a relay are connected in series between the 220V AC power and the transformer, and a current-limiting resistor R40 is connected in parallel at both ends of the relay.

4. The frequency-adjustable high-frequency AC output transformerless power amplifier circuit according to claim 2, characterized in that: The power amplifier driver module includes a power amplifier IC chip U1, resistors R41, R42, a triode Q40, capacitors C42, C43, a single-row pin JX1, and a single-row pin JX2. The power amplifier IC chip U1 uses an IC chip model: UPC1342. The normal operating voltage range of this chip is ±25V~±52V, the driving power is 50W~110W, and the center voltage offset is less than 50mv. Pins 1 and 2 of the power amplifier IC chip U1 are connected in parallel and electrically connected to the socket JX1-1 of the single-row pin JX1. Pin 3 of the power amplifier IC chip U1 is electrically connected to the sockets JX1-2, JX1-3, and JX1-4 of the single-row pin JX1 and grounded. Pin 3 of the power amplifier IC chip U1 is also connected to one end of a resistor R41, and the other end of the resistor R41 is grounded. Pin 4 of the power amplifier IC chip U1 is electrically connected to the socket JX1-5 of the single-row pin JX1, pin 5 of the power amplifier IC chip U1 is electrically connected to the socket JX2-6 of the single-row pin JX2, pin 6 of the power amplifier IC chip U1 is electrically connected to the socket JX1-6 of the single-row pin JX1, and pin 7 of the power amplifier IC chip U1 is electrically connected to the socket JX1-7 of the single-row pin JX1 and the socket JX2-4 of the single-row pin JX2, respectively. A capacitor C42 is also connected between pins 6 and 7 of the power amplifier IC chip U1. Pin 8 of the power amplifier IC chip U1 is connected to the collector of the transistor Q40, the base of the transistor Q40 is electrically connected to the socket JX2-3 of the single-row pin JX2, and the emitter of the transistor Q40 is electrically connected to pin 7 of the power amplifier IC chip U1 and the socket JX2-4 of the single-row pin JX2. Pin 8 of the power amplifier IC chip U1 is also connected to one end of the resistor R42, and the other end of the resistor R42 is electrically connected to the socket JX2-5 of the single-row pin JX2. Pins 9 and 10 of the power amplifier IC chip U1 are connected in parallel and electrically connected to the socket JX1-8 of the single-row pin JX1. Pin 11 of the power amplifier IC chip U1 is electrically connected to the socket JX2-2 of the single-row pin JX2. Pin 12 of the power amplifier IC chip U1 is electrically connected to the socket JX2-1 of the single-row pin JX2. A capacitor C43 is connected between pins 11 and 12 of the power amplifier IC chip U1.

5. The frequency-adjustable high-frequency AC output transformerless power amplifier circuit according to claim 4, characterized in that: The same direction power amplifier module and reverse direction power amplifier module are the same, including external power supply VCC1, external power supply VEE1, signal input terminal JX3, electrolytic capacitors C1, C6, capacitors C2, C3, C4, C30, C31, trimmer potentiometer RW1, resistor R100, resistor R101, resistors R1, R2, R3, R5, single row female JX4 plugged with single row needle JX1, and single row female JX4 plugged with single row needle JX1. Pin header JX2 plugs into single-row female JX5, transistors Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15, Q16, Q17, Q18, Q19, Q20, Q21, Q22, Q23, Q24, Q25, Q26, resistor R100, resistor R101, resistor R12, resistor R13 , resistor R14, resistor R15, resistor R16, resistor R17, resistor R18, resistor R19, resistor R20, resistor R21, resistor R22, resistor R23, resistor R24, resistor R25, resistor R26, resistor R27, resistor R28, resistor R29, resistor R30, resistor R31, resistor R32, resistor R33, resistor R34, resistor R36, resistor R38, resistor R39, resistor R40, resistor R41, resistor R42, resistor R43, resistor R44, resistor R45, resistor R46, resistor R47, resistor R48, resistor R49, resistor R6, resistor R7, resistor R8, resistor R9, resistor R54, resistor R55, resistor R56, resistor R57, resistor R58, resistor R59, resistor R60, resistor R61; Among them, transistors Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, and Q13 are NPN transistors, and transistors Q14, Q15, Q16, Q17, Q18, Q19, Q20, Q21, Q22, Q23, Q24, Q25, and Q26 are PNP transistors; The socket JX4-1 of the single-row female JX4 is respectively connected to the power output VCC and one end of the resistor R100, the other end of the resistor R100 is connected to the external power supply VCC1, the socket JX4-2 of the single-row female JX4 is connected to the negative electrode of the electrolytic capacitor C1, and the positive electrode of the electrolytic capacitor C1 is connected to the power output VCC, the sockets JX4-3 and JX4-3 of the single-row female JX4 are connected in parallel and grounded, and the socket JX4-5 of the single-row female JX4 is respectively connected to the resistors R1, R2, and the capacitor C 3, the other ends of resistor R2 and capacitor C3 are grounded, the other end of resistor R1 is connected in series with capacitor C2 and then connected to interface JX3-3 of signal input wiring terminal JX3, interface JX3-1 of signal input wiring terminal JX3 is grounded, capacitor C4 is connected between sockets JX4-6 and JX4-7 of single-row female JX4, socket JX4-8 of single-row female JX4 is connected in series with resistor R101 and then connected to external power supply VEE1, and JX4-8 is connected to power output VEE; The socket JX5-1 of the single-row female JX5 is connected to one end of the resistors R110 and R12 respectively, the socket JX5-2 of the single-row female JX5 is connected to one end of the resistors R111 and R61 respectively, the other ends of the resistors R110 and R111 are connected in parallel, the socket JX5-3 of the single-row female JX5 is connected to pin 1 of the fine-tuning potentiometer, the socket JX5-4 of the single-row female JX5 is connected to pin 3 of the fine-tuning potentiometer, the socket JX5-5 of the single-row female JX5 is connected to pin 2 of the fine-tuning potentiometer, the socket JX5-6 of the single-row female JX5 is connected to one end of the resistor R3 and the resistor R5 at the same time, the other end of the resistor R3 is connected to the positive electrode of the capacitor C6, the negative electrode of the capacitor C6 is connected to GND, the other end of the resistor R5 is connected to the connection end between R110 and R111 at the same time, and the socket JX5-7 of the single-row female JX5 is connected to GND; The other end of resistor R12 is connected to the base of transistor Q1, capacitor C30 is connected between the base and collector of transistor Q1, the collector of transistor Q1 is also connected to the external power supply VCC1, the emitter of transistor Q1 is respectively connected to one end of resistors R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, and R24; the other end of resistor R15 is connected to the base of transistor Q2, the collector of transistor Q2 is connected to the external power supply VCC1, and the emitter of transistor Q2 is connected to one end of resistor R25; the other end of resistor R16 The base of transistor Q3 is connected, the collector of transistor Q3 is connected to the external power supply VCC1, and the emitter of transistor Q3 is connected to one end of resistor R26; the other end of resistor R17 is connected to the base of transistor Q4, the collector of transistor Q4 is connected to the external power supply VCC1, and the emitter of transistor Q4 is connected to one end of resistor R27; the other end of resistor R18 is connected to the base of transistor Q5, the collector of transistor Q5 is connected to the external power supply VCC1, and the emitter of transistor Q5 is connected to one end of resistor R28; the other end of resistor R21 is connected to the base of transistor Q6, the collector of transistor Q6 is connected to the external power supply VCC1, and the emitter of transistor Q6 is connected Connect one end of resistor R29; the other end of resistor R19 is connected to the base of transistor Q7, the collector of transistor Q7 is connected to the external power supply VCC1, and the emitter of transistor Q7 is connected to one end of resistor R30; the other end of resistor R22 is connected to the base of transistor Q8, the collector of transistor Q8 is connected to the external power supply VCC1, and the emitter of transistor Q8 is connected to one end of resistor R31; the other end of resistor R23 is connected to the base of transistor Q9, the collector of transistor Q9 is connected to the external power supply VCC1, and the emitter of transistor Q9 is connected to one end of resistor R32; the other end of resistor R24 is connected to the base of transistor Q10, the collector of transistor Q10 is connected to the external power supply VCC1, and the emitter of transistor Q9 is connected to one end of resistor R32. Connected to the external power supply VCC1, the emitter of transistor Q10 is connected to one end of resistor R33; the other end of resistor R13 is connected to the base of transistor Q11, the collector of transistor Q11 is connected to the external power supply VCC1, and the emitter of transistor Q11 is connected to one end of resistor R34; the other end of resistor R14 is connected to the base of transistor Q12, the collector of transistor Q12 is connected to the external power supply VCC1, and the emitter of transistor Q12 is connected to one end of resistor R35; the other end of resistor R20 is connected to the base of transistor Q13, the collector of transistor Q12 is connected to the external power supply VCC1, and the emitter of transistor Q12 is connected to one end of resistor R36; The other ends of resistors R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R36, and R37 are connected in parallel to serve as the output ends OUT of the resistors of the same-direction power amplifier module and the reverse power amplifier module; The other end of the resistor R61 is connected to the base of the transistor Q26, the capacitor C31 is connected between the base and the collector of the transistor Q26, and the collector of the transistor Q26 is also connected to the external power supply VEE1; The emitter of transistor Q26 is connected to one end of resistors R59, R60, R49, R50, R51, R52, R53, R54, R55, R56, R57, and R58, respectively; the other end of resistor R59 is connected to the base of transistor Q14, the collector of transistor Q14 is connected to the external power supply VEE1, and the emitter of transistor Q14 is connected to one end of resistor R37; the other end of resistor R60 is connected to the base of transistor Q15, the collector of transistor Q15 is connected to the external power supply VEE1, and the emitter of transistor Q15 is connected to one end of resistor R38; the other end of resistor R49 is connected to the base of transistor Q16. The base and collector of transistor Q16 are connected to the external power supply VEE1, and the emitter of transistor Q16 is connected to one end of resistor R39; the other end of resistor R50 is connected to the base of transistor Q17, the collector of transistor Q17 is connected to the external power supply VEE1, and the emitter of transistor Q17 is connected to one end of resistor R40; the other end of resistor R51 is connected to the base of transistor Q18, the collector of transistor Q18 is connected to the external power supply VEE1, and the emitter of transistor Q18 is connected to one end of resistor R41; the other end of resistor R52 is connected to the base of transistor Q19, the collector of transistor Q19 is connected to the external power supply VEE1, and the emitter of transistor Q19 is connected to one end of resistor R42; The other end of resistor R53 is connected to the base of transistor Q20, the collector of transistor Q20 is connected to the external power supply VEE1, and the emitter of transistor Q20 is connected to one end of resistor R43; the other end of resistor R54 is connected to the base of transistor Q21, the collector of transistor Q21 is connected to the external power supply VEE1, and the emitter of transistor Q21 is connected to one end of resistor R44; the other end of resistor R55 is connected to the base of transistor Q22, the collector of transistor Q22 is connected to the external power supply VEE1, and the emitter of transistor Q22 is connected to one end of resistor R45; The other end of resistor R56 is connected to the base of transistor Q23, the collector of transistor Q23 is connected to the external power supply VEE1, and the emitter of transistor Q23 is connected to one end of resistor R46; the other end of resistor R57 is connected to the base of transistor Q24, the collector of transistor Q24 is connected to the external power supply VEE1, and the emitter of transistor Q24 is connected to one end of resistor R47; the other end of resistor R58 is connected to the base of transistor Q25, the collector of transistor Q25 is connected to the external power supply VEE1, and the emitter of transistor Q25 is connected to one end of resistor R48; The other ends of the resistors R37 , R38 , R39 , R40 , R41 , R42 , R43 , R44 , R45 , R46 , R47 , and R48 are connected in parallel and to the output terminal OUT.

6. The frequency-adjustable high-frequency AC output transformerless power amplifier circuit according to claim 5, characterized in that: The same-direction power amplifier module and the reverse power amplifier module also include a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C20, a capacitor C21, a capacitor C22, and a capacitor C23. One ends of the resistors R6, R7, R8, and R9 are connected in parallel and connected to the output end OUT, the other ends of the resistors R6 and R7 are connected in parallel and connected to one end of the capacitors C20 and C21, the other ends of the resistors R8 and R9 are connected in parallel and connected to one end of the capacitors C22 and C23, and the other ends of the capacitors C20, C21, C22, and C23 are grounded.

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