Broadband high-power high-efficiency radio frequency circuit
By using the fast switching and zero-voltage soft switching state of the field-effect tube Q in the RF circuit, combined with square wave signal control and resonant circuit, the problem of low efficiency of traditional RF power supply is solved, and efficient signal amplification and monitoring are achieved.
Patent Information
- Application Number
- CN202422834424.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-11-20
AI Technical Summary
Traditional RF power supplies have low efficiency, high power consumption and losses, especially in Class A and Class AB designs, which make it difficult to meet high efficiency requirements.
The field effect tube Q is used as the main power amplifier component, which switches between the on and off states through fast switching. Combined with the zero-voltage soft switching state of capacitor C1, the square wave signal generation circuit is used to control the switching state, and the signal is amplified and monitored through the series resonant circuit and power coupler.
It significantly improves the efficiency of RF circuits, reduces power consumption and switching losses, and achieves efficient signal amplification and monitoring.
Smart Images
Figure CN223348636U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of high-efficiency radio frequency circuits, in particular to a broadband, high-power and high-efficiency radio frequency circuit. Background Art
[0002] The RF power supply is a crucial component of space RF ion propulsion or Hall propulsion PPUs. It provides RF energy to the RF thruster or RF cathode, generating ion propulsion and electron generation by plasma-forming the neutral gas within the discharge chamber and extracting ions or electrons through the gate. The RF power supply also represents a significant portion of the overall power consumption of the propulsion system. Given the complex operating modes of thrusters, the power efficiency and load compatibility of the RF power supply are key performance indicators.
[0003] Traditional RF power supplies use Class A or AB designs, which are relatively inefficient. Class A power amplifiers, also known as Class A power amplifiers, have a high quiescent current and high transistor consumption due to the connection of a much larger signal to the AC source. This results in low amplifier efficiency and severe heat generation. While Class AB power amplifiers significantly reduce transistor consumption and improve efficiency, they still experience some transistor consumption, and the circuit's efficiency is also not very high. To address these issues, a broadband, high-power, and efficient RF circuit is proposed. Utility Model Content
[0004] The technical problem to be solved by the present invention is to provide a broadband, high-power and efficient radio frequency circuit. The efficient radio frequency circuit uses the field effect tube Q in the amplifier circuit as the main power amplifier element. By making the field effect tube Q quickly switch between on and off, the waveform of the output signal is close to the ideal theoretical waveform. Since the field effect tube Q is either fully on or fully off, the power consumption can be greatly reduced and the efficiency of the circuit can be significantly improved. At the same time, the source and drain of the field effect tube Q are connected in parallel with a capacitor C1. The capacitor enables the amplifier circuit to operate in a zero-voltage soft switching state, which can reduce the loss of the field effect tube Q during the switching process and improve the switching efficiency, thereby further reducing the circuit loss and improving the circuit efficiency. In addition, the square wave signal can also reduce the turn-on loss of the field effect tube Q due to its stable level characteristics and fast switching speed, solving the technical problems of high amplifier circuit loss and low circuit efficiency in the prior art.
[0005] The technical solution adopted by the embodiment of the present application to solve the technical problem is:
[0006] A broadband, high-power, and efficient radio frequency circuit includes an amplifier circuit powered by a direct current (DC) power supply VDC and connected to a radio frequency cathode equivalent circuit. Furthermore, a field-effect transistor (Q) is electrically connected to the amplifier circuit. Q serves as a primary power amplifier element. By rapidly switching the field-effect transistor (Q) between on and off, the waveform of the output signal approaches an ideal theoretical waveform. Since the field-effect transistor (Q) is either fully on or fully off, power consumption can be significantly reduced, significantly improving circuit efficiency. A square-wave signal generating circuit controls the switching state of the field-effect transistor (Q) through a driving circuit. The square-wave signal, due to its stable level characteristics and fast switching speed, can reduce the turn-on loss of the field-effect transistor (Q). A capacitor (C1) is connected in parallel to the source and drain of the field-effect transistor (Q). This capacitor enables the amplifier circuit to operate in a zero-voltage soft-switching state, further reducing circuit loss and improving circuit efficiency.
[0007] In one possible implementation, a power coupler is electrically connected to the amplification circuit, and the square wave signal generating circuit controls the operating state of the power coupler through a control circuit. The power coupler can divide the circuit signal into several paths in proportion, so it can be used for power measurement and monitoring. By measuring the power at the coupling end, the power level of the input signal can be understood, thereby realizing monitoring and adjustment of the RF circuit.
[0008] In one possible implementation, the amplifier circuit is connected in series with an inductor L2 and a capacitor C. The two constitute a series resonant circuit that resonates at the fundamental frequency of the signal. The series resonant circuit can amplify signals of a specific frequency. When the frequency of the input signal is close to the resonant frequency, the circuit will amplify the signal and increase the amplitude of the output signal.
[0009] In a possible implementation, the DC power supply VDC output end is electrically connected to an inductor L1, which is a radio frequency choke that allows the DC power supply VDC to pass through to provide energy to the amplifier circuit while preventing the radio frequency current from being transmitted. In an ideal state, the inductive reactance is infinite.
[0010] In summary, the present invention has the following beneficial technical effects:
[0011] The field-effect transistor Q in the amplifier circuit serves as the main power amplifier element. By enabling the field-effect transistor Q to quickly switch between on and off, the waveform of the output signal is close to the ideal theoretical waveform. Since the field-effect transistor Q is either fully on or fully off, it can greatly reduce power consumption and significantly improve the efficiency of the circuit. At the same time, a capacitor C1 is connected in parallel with the source and drain of the field-effect transistor Q. This capacitor enables the amplifier circuit to operate in a zero-voltage soft switching state, which can reduce the loss of the field-effect transistor Q during the switching process and improve the switching efficiency, thereby further reducing circuit loss and improving circuit efficiency.
[0012] In addition, the switching state of the field effect transistor Q is controlled by the square wave signal output by the square wave signal generating circuit. The square wave signal can also reduce the turn-on loss of the field effect transistor Q due to its stable level characteristics and fast switching speed. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0014] Figure 1 This is a schematic diagram of the utility model. DETAILED DESCRIPTION
[0015] The technical solution in the embodiments of the present application is to solve the problems of the above-mentioned background technology, and the overall idea is as follows:
[0016] like Figure 1 As shown, this embodiment provides a broadband, high-power, and efficient radio frequency circuit, including an amplifier circuit, which is connected to a radio frequency cathode equivalent circuit; in the amplifier circuit, power is supplied by a DC power supply VDC, and a field effect transistor Q is electrically connected to the amplifier circuit. Q serves as a main power amplification element. By quickly switching the field effect transistor Q between on and off, the waveform of the output signal is close to the ideal theoretical waveform. Since the field effect transistor Q is either fully on or fully off, the power consumption can be greatly reduced, and the efficiency of the circuit can be significantly improved.
[0017] Among them, the source and drain of the field effect tube Q are connected in parallel with a capacitor C1, which enables the amplifier circuit to operate in a zero-voltage soft switching state, which can reduce the loss of the field effect tube Q during the switching process and improve the switching efficiency, thereby further reducing the circuit loss and improving the circuit efficiency.
[0018] Furthermore, the switching state of the FET Q is controlled by a square-wave signal generating circuit through a driver circuit. The square-wave signal, with its stable level characteristics and fast switching speed, can reduce the turn-on loss of the FET Q. By adjusting the duty cycle and frequency of the square-wave signal, precise control of the RF switch can be achieved, thereby enabling flexible scheduling of the RF signal.
[0019] like Figure 1 As shown, the amplifier circuit is electrically connected to a power coupler, and the square wave signal generating circuit controls the working state of the power coupler through the control circuit. The power coupler can divide the circuit signal into several paths in proportion, so it can be used for power measurement and monitoring. By measuring the power at the coupling end, the power level of the input signal can be understood, thereby realizing the monitoring and adjustment of the RF circuit.
[0020] like Figure 1As shown, the amplifier circuit is connected in series with an inductor L2 and a capacitor C. The above two constitute a series resonant circuit that resonates at the fundamental frequency of the signal. The series resonant circuit can amplify signals of specific frequencies. When the frequency of the input signal is close to the resonant frequency, the circuit will amplify the signal and increase the amplitude of the output signal.
[0021] like Figure 1 As shown, the output end of the DC power supply VDC is electrically connected to an inductor L1, which is a radio frequency choke. It allows the DC current of the DC power supply VDC to pass through to provide energy to the amplifier circuit, while preventing the radio frequency current from being transmitted. In an ideal state, the inductive reactance is infinite.
[0022] The use principle and use process of this utility model:
[0023] The field-effect transistor Q in the amplifier circuit serves as the main power amplifier element. By enabling the field-effect transistor Q to quickly switch between on and off, the waveform of the output signal is close to the ideal theoretical waveform. Since the field-effect transistor Q is either fully on or fully off, it can greatly reduce power consumption and significantly improve the efficiency of the circuit. At the same time, a capacitor C1 is connected in parallel with the source and drain of the field-effect transistor Q. This capacitor enables the amplifier circuit to operate in a zero-voltage soft switching state, which can reduce the loss of the field-effect transistor Q during the switching process and improve the switching efficiency, thereby further reducing circuit loss and improving circuit efficiency.
[0024] In addition, the switching state of the field-effect transistor Q is controlled by the square wave signal output by the square wave signal generating circuit. The square wave signal can also reduce the turn-on loss of the field-effect transistor Q due to its stable level characteristics and fast switching speed. By adjusting the duty cycle and frequency of the square wave signal, precise control of the RF switch can be achieved, thereby realizing flexible scheduling of the RF signal.
[0025] Finally, it should be noted that the above embodiments are merely examples for the purpose of illustrating the present invention and are not intended to limit the embodiments. Those skilled in the art will readily appreciate that other variations or modifications based on the above description are possible. It is not necessary and impossible to provide an exhaustive list of all possible embodiments. However, any obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.
Claims
1. A broadband, high-power, and high-efficiency radio frequency circuit, characterized in that: include: The amplifier circuit is powered by a DC power supply VDC and is connected to the radio frequency cathode equivalent circuit. In addition, the amplifier circuit is electrically connected to a field effect transistor Q; A square wave signal generating circuit controls the switching state of the field effect transistor Q through a driving circuit; The source and drain of the field effect transistor Q are connected in parallel with a capacitor C1.
2. The broadband, high-power, and high-efficiency radio frequency circuit according to claim 1, characterized in that: The amplifying circuit is electrically connected to a power coupler, and the square wave signal generating circuit controls the working state of the power coupler through a control circuit.
3. The broadband, high-power, and high-efficiency radio frequency circuit according to claim 1, wherein: The amplifier circuit is connected in series with an inductor L2 and a capacitor C, which form a series resonant circuit that resonates at the fundamental frequency of the signal.
4. The broadband, high-power, and high-efficiency radio frequency circuit according to claim 1, wherein: The DC power supply VDC output terminal is electrically connected to an inductor L1 which is a radio frequency choke.