Power combiner and radio frequency power supply
By connecting the isolation circuit in the power synthesizer of the RF power supply, the problem of subharmonic self-excitation is solved, and higher output signal quality and total output power are achieved, reducing energy loss.
Patent Information
- Application Number
- CN202510096070.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2025-05-23
Smart Images
Figure CN120034141A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of electronic power technology, and in particular to a power synthesizer and a radio frequency power supply. Background Art
[0002] With the continuous progress and development of science and technology, RF power supplies are increasingly widely used in various fields such as semiconductor production. The future development trend of RF power supplies is to improve the power density of devices, and there are increasingly higher requirements for the miniaturization of circuits. In binary power synthesizers based on Class AB (or Class AB) power amplifiers (such as two-in-one, four-in-one, eight-in-one, etc.), due to the nonlinearity of the internal devices of the chip, non-isolated circuits are prone to cause subharmonic self-excitation. In RF power supplies, the load impedance of the power amplifier changes dramatically when it is working. Usually, a resistor-capacitance circuit (RC) negative feedback circuit is used between the control electrode and the output electrode of the power tube to suppress output power fluctuations, but this circuit will also deteriorate the mixing gain and aggravate the generation of subharmonic self-excitation.
[0003] In order to suppress the self-excitation of harmonics, a combining architecture with isolation resistors, such as Wilkinson power combiner or 90° bridge combiner, can be used after the power tube passes through the impedance matching circuit to increase the isolation between the power amplifier branches, thereby suppressing the self-excitation of subharmonics. However, this combining architecture with isolation resistors requires more components and a larger circuit board, and the circuit volume is large and the circuit structure is complex. Summary of the invention
[0004] The present application provides a power synthesizer and a radio frequency power supply, which can improve the isolation between power amplifier branches and the effectiveness of suppressing subharmonic self-excitation, while also achieving circuit miniaturization, improving power density, and simplifying the circuit structure.
[0005] In a first aspect, the present application provides a power synthesizer, which includes at least two power amplifier circuits and an isolation circuit, and the output ends of the at least two power amplifier circuits are connected in parallel to the output end of the power synthesizer. The power amplifier circuit includes a power tube and a matching circuit, the first connection end of the power tube serves as the input end of the power amplifier circuit, the second connection end of the power tube is connected to the output end of the power synthesizer through the matching circuit, and the third connection end of the power tube is grounded. Among them, an isolation circuit is connected in parallel between the second connection ends of the power tubes of any two adjacent power amplifier circuits, and the isolation circuit is composed of a resistor and a capacitor, or an inductor and a capacitor. Here, the isolation circuit is used to isolate two adjacent power amplifier circuits to suppress subharmonic self-excitation between the two power amplifier circuits.
[0006] In the present application, adjacent power amplifier circuits are isolated by an isolation circuit composed of a resistor and a capacitor, or composed of an inductor and a capacitor, so that the isolation between the power amplifier circuits can be improved, the effectiveness of suppressing subharmonic self-excitation can be improved, and at the same time, the circuit can be miniaturized and the power density can be improved. The circuit structure is simple and the applicability is high.
[0007] In a possible implementation of the first aspect, the isolation circuit is composed of a resistor and at least one capacitor connected in series. In the present application, based on the isolation circuit composed of a resistor and at least one capacitor connected in series, two adjacent power amplifier circuits can be isolated in a limited circuit space, thereby effectively avoiding the generation of subharmonic self-excitation between the two adjacent power amplifier circuits. There are few components in the isolation circuit, the structure of the isolation circuit is simple, the stability is strong, the circuit can be miniaturized, and the power density can be improved, and the applicability is high.
[0008] In a possible implementation of the first aspect, the isolation circuit is composed of a resistor, a first capacitor, a second capacitor and a third capacitor, wherein the two ends of the resistor are respectively connected in series with the first capacitor and the second capacitor, and the third capacitor is connected in parallel with the resistor. In the present application, the isolation circuit composed of a resistor and three capacitors in series / parallel can improve the isolation between power amplifier circuits while also adapting to the needs of power combiners of more product forms, which can improve the diversity of the circuit structure of the power combiner, and the circuit structure is simple and highly applicable.
[0009] In a possible implementation of the first aspect, the isolation circuit is composed of an inductor and at least one capacitor connected in series. In the present application, the isolation circuit composed of an inductor and at least one capacitor connected in series can improve the isolation between power amplifier circuits while also improving the diversity of the selection of components of the isolation circuit, thereby improving the diversity of the circuit structure of the power combiner and having high applicability.
[0010] In a possible implementation of the first aspect, in a fourth possible implementation, the power combiner further includes a power combining circuit, the output ends of the at least two power amplifier circuits are connected in parallel to the input end of the power combining circuit, and the output end of the power combining circuit serves as the output end of the power combining circuit. In the present application, multiple power amplifier circuits can be combined and output into one signal by the power combining circuit, the circuit structure is simple, the circuit can be miniaturized, the power density can be improved, and the applicability is high.
[0011] In a possible implementation of the first aspect, the power amplifier circuit further includes a stabilization circuit, the input end of the stabilization circuit serves as the input end of the power amplifier circuit, the output end of the stabilization circuit is connected to the first connection end of the power tube, and the stabilization circuit is composed of a capacitor and a resistor in parallel. In the present application, the stabilization circuit can provide a stable gain for the power amplifier circuit within the entire operating frequency range, avoid the influence of gain fluctuation on signal quality, suppress subharmonic self-excitation, and improve the working stability of the circuit, the circuit structure is simple, the circuit stability is strong, and the applicability is high.
[0012] In a possible implementation of the first aspect, the power amplifier circuit further includes a feeding inductor, and the second connection end of the power tube is connected to the DC power supply through the feeding inductor. In the present application, the feeding inductor can connect the power amplifier circuit with the DC power supply, improve the response of the power amplifier circuit to load changes, maintain stable voltage and current, and support the isolation circuit to suppress subharmonic self-excitation, with a simple circuit structure, strong circuit stability, and high applicability.
[0013] In a possible implementation of the first aspect, the power tube includes a metal oxide semiconductor field effect transistor, the first connection end of the power tube is a gate, the second connection end of the power tube is a drain, and the third connection end of the power tube is a source. In the present application, the power tube can be a metal oxide semiconductor field effect transistor. Based on the isolation circuit connected between the drain roots of the metal oxide semiconductor field effect transistor, the isolation between the power amplifier circuits can be improved, the leakage current generated by the resistor on the isolation circuit between the collector roots can be suppressed, and the self-excitation generation of subharmonics can be effectively avoided. The device type of the power tube is highly optional and highly applicable.
[0014] In a possible implementation of the first aspect, the power tube includes an insulated gate bipolar transistor, the first connection end of the power tube is a gate, the second connection end of the power tube is a collector, and the third connection end of the power tube is an emitter. In the present application, the power tube can be an insulated gate bipolar transistor. Based on the isolation circuit connected between the collector roots of the insulated gate bipolar transistor, the isolation between the power amplifier circuits can be improved, the leakage current generated by the resistor on the isolation circuit between the collector roots can be suppressed, and the self-excitation generation of subharmonics can be effectively avoided. The power tube type is highly optional and has high applicability.
[0015] In a second aspect, the present application provides a radio frequency power supply, the radio frequency power supply comprising a direct current power supply and a power synthesizer provided in the first aspect. In the present application, based on the coordinated work of the direct current power supply and the power synthesizer, the subharmonic self-excitation between the multi-channel power amplifier circuits can be suppressed, the output signal quality of the radio frequency power supply can be improved, the output waveform distortion or gain mutation of the radio frequency power supply can be avoided, the total output power of the radio frequency power supply can be significantly improved, the energy loss can be reduced, and the system structure is simple and highly applicable. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of a power combiner provided by the present application;
[0017] Figure 2 is another structural schematic diagram of the power combiner provided by the present application;
[0018] Figure 3 is another structural schematic diagram of the power combiner provided by the present application;
[0019] Figure 4 is another structural schematic diagram of the power combiner provided by the present application;
[0020] Figure 5 is another structural schematic diagram of the power combiner provided by the present application;
[0021] Figure 6 is another structural schematic diagram of the power combiner provided by the present application;
[0022] Figure 7 is another structural schematic diagram of the power combiner provided by the present application;
[0023] Figure 8 is another structural schematic diagram of the power combiner provided by the present application;
[0024] Fig. 9 is another structural schematic diagram of the power combiner provided by the present application;
[0025] Fig.10 is another structural schematic diagram of the power combiner provided by the present application;
[0026] Fig.11 It is a structural schematic diagram of the radio frequency power supply provided in this application. DETAILED DESCRIPTION
[0027] As one of the indispensable electronic devices in the field of power electronics technology, power combiner is widely used in power systems such as radio frequency power supply, industrial control, energy storage system and wireless communication base station. The basic principle of power combiner is to combine the output signals of multiple power amplifier circuits into a single output signal to improve the overall output power. Since there are multiple power amplifier circuits coexisting in the power combiner, there is a problem of subharmonic self-excitation. The signal generated by subharmonic self-excitation may interfere with the main signal, resulting in additional power consumption, which will lead to the performance degradation of the power combiner. In the power combiner, the isolation between the power amplifier circuits can usually be improved by introducing an isolation resistor (res istor, R) between adjacent power amplifier circuits to suppress subharmonic self-excitation. However, since the isolation resistor will generate leakage current when working, it will aggravate the generation of subharmonic self-excitation and the isolation resistor itself absorbs power and generates heat. If the above-mentioned influence is reduced by increasing the power level of R or increasing the resistance value of R, the circuit will lose the advantage of miniaturization, or the isolation of the multi-channel power amplifier will be sacrificed, and the suppression effect of subharmonic self-excitation will be reduced.
[0028] The power synthesizer provided in this application can be applied to the synthesis of multi-channel power amplifiers in a limited circuit space to suppress subharmonic self-excitation. By using a simple circuit design, the isolation between power amplifier branches can be improved through an isolation circuit, eliminating the adverse effects of leakage current generated by isolation resistors, thereby effectively avoiding the generation of subharmonic self-excitation. At the same time, the circuit can be miniaturized, the power density can be improved, and the applicability is high. Here, the above-mentioned power synthesizer can be used in fields involving signal power amplification and synthesis, including but not limited to radio frequency power supply, wireless communication, industrial control, etc., which can be determined according to the actual application scenario and are not limited here.
[0029] See also Figure 1 , Figure 1 Schematic diagram of a power combiner provided by the present application. Figure 1 As shown, the power combiner provided in the present application may include at least two power amplifier circuits and an isolation circuit, the output ends of the at least two power amplifier circuits are connected in parallel to the output end of the power combiner, and an isolation circuit is connected in parallel between any two adjacent power amplifier circuits. The number of power amplifier circuits can be determined according to the actual application scenario, and is not limited here. Here, the input of the power amplifier circuit can be a variety of signal sources such as electrical signals and radio frequency signals (referred to as input signal sources for short), which can be determined according to the actual application scenario, and is not limited here. At the same time, the input signal sources can be independent of each other, or they can have a correlation relationship in amplitude or phase, which can be determined according to the actual application scenario, and is not limited here. For example, if Figure 1As shown, the power combiner includes n power amplifier circuits (n is an integer greater than 1), including but not limited to power amplifier circuit 1, power amplifier circuit 2, ..., power amplifier circuit n, etc., and the n power amplifier circuits correspond to n inputs (i.e., signal inputs, including input 1, input 2, ..., input n). Figure 1 In the power combiner shown in FIG. 1 , there is an isolation circuit between two adjacent power amplifier circuits, such as Figure 1 The power combiner shown may include n-1 isolation circuits, including but not limited to isolation circuit 1, ..., isolation circuit n-1, etc. Here, the isolation circuit may be composed of a resistor and a capacitor, or an inductor and a capacitor, and the isolation circuit is used to isolate two adjacent power amplifier circuits to suppress subharmonic self-excitation between the two power amplifier circuits.
[0030] In some feasible implementations, the power amplifier circuit may include a power tube (power amplifier, PA) and a matching circuit, the first connection end of the power tube serves as the input end of the power amplifier circuit, the second connection end of the power tube is connected to the output end of the power synthesizer through the matching circuit, and the third connection end of the power tube is grounded, wherein an isolation circuit is connected in parallel between the second connection ends of any two adjacent power tubes of the power amplifier circuit. Here, the power tube can be used to receive a signal and convert the signal into a signal with higher power, and the selection of the power tube includes but is not limited to a bipolar transistor (bipolar junction transistor, BJT), a metal oxide semiconductor field effect transistor (metal ll icoxide semiconductor field effect transistor, MOSFET), an insulated gate bipolar transistor (insulated gate bipolar transistor, IGBT), etc. If the power tube is a metal oxide semiconductor field effect transistor, the first connection end of the power tube may be a gate, the second connection end of the power tube may be a drain, and the third connection end of the power tube may be a source. If the power tube is an insulated gate bipolar transistor, the first connection end of the power tube may be a gate, the second connection end of the power tube may be a collector, and the third connection end of the power tube may be an emitter. It can be understood that the first connection end, the second connection end and the third connection end of the power tube can be determined according to the specific device type of the power tube, and no limitation is made here. The first connection end, the second connection end and the third connection end of the power tube in each power amplifier circuit described in the present application can also be determined according to the device type of the power tube, and no further description is given. The matching circuit can complete impedance conversion to maximize energy transmission, reduce signal reflection, and optimize the performance of the power amplifier circuit. The matching circuit can generally include one or more elements of an inductor (inductor, L), a capacitor (capac itor, C), a transformer, a diode, etc. The circuit structure of the matching circuit can be determined according to the actual application scenario, and no limitation is made here.
[0031] For the convenience of description, a power combiner including two power amplifier circuits is used as an example for illustration.
[0032] For example, please see Figure 2 , Figure 2 is another schematic diagram of the structure of the power combiner provided by the present application. Figure 2The power combiner shown includes a power amplifier circuit 1, a power amplifier circuit 2 and an isolation circuit. The power amplifier circuit 1 includes a power tube PA1 and a matching circuit 1, and the power amplifier circuit 2 includes a power tube PA2 and a matching circuit 2. An isolation circuit is connected in parallel between the second connection ends of the power tubes PA1 and PA2 of the power amplifier circuit 1 and the power amplifier circuit 2. Among them, the first connection ends of the power tubes PA1 and PA2 can be used as the input end of the power amplifier circuit, and the second connection ends of the power tubes PA1 and PA2 can be connected to the output end of the power combiner through the matching circuit 1 and the matching circuit 2 respectively, and the third connection ends of the power tubes PA1 and PA2 are grounded. Here, when the second connection ends of the power tubes PA1 and PA2 are used as output poles, there may be interference between the output signals of the second connection ends of the power tubes PA1 and PA2, and subharmonic self-excitation may be generated. Therefore, the isolation circuit is connected between the second connection ends of the power tubes PA1 and PA2 to improve the isolation between the power tubes PA1 and PA2, thereby suppressing the subharmonic self-excitation between the two adjacent power amplifier circuits.
[0033] In the present application, for power tubes of different selections, connecting an isolation circuit between the second connection ends of the power tubes can improve the isolation between the power amplifier circuits, thereby effectively avoiding the generation of subharmonic self-excitation. Here, the selection of power tubes includes but is not limited to bipolar transistors, metal oxide semiconductor field effect transistors, or insulated gate bipolar transistors. The power synthesizer can achieve power amplification and synthesis based on a power amplifier circuit composed of a power tube and a matching circuit. The isolation circuit connected between the output poles of the power tubes can improve the isolation between multiple power amplifier circuits, thereby suppressing the subharmonic self-excitation between the multiple power amplifier circuits, thereby maintaining the working stability of the power synthesizer. It can be understood that in the present application, the device type of the power tube can be flexibly selected, the circuit structure is simple, and the applicability is strong.
[0034] In some feasible implementations, the isolation circuit may be composed of a resistor and a capacitor, or may be composed of an inductor and a capacitor. Here, the selection of resistors includes but is not limited to carbon film resistors, metal film resistors, wire wound resistors, metal oxide film resistors, surface mount resistors, etc., the selection of capacitors includes but is not limited to ceramic capacitors, electrolytic capacitors, film capacitors, tantalum capacitors, etc., and the selection of inductors includes but is not limited to winding inductors, ceramic core inductors, ferrite core inductors, air core inductors, planar inductors, etc., which can be determined according to the actual application scenario and are not limited here. In the present application, the isolation circuit can suppress the generation of subharmonic self-excitation in the process of isolating the adjacent power amplifier circuit. At the same time, the power synthesizer has a simple structure, the circuit is highly debuggable, the circuit can be miniaturized, the power density can be improved, and the applicability is high.
[0035] In some feasible implementations, the isolation circuit may be composed of a resistor and at least one capacitor connected in series. Figure 3 , Figure 3 is another schematic diagram of the structure of the power combiner provided by the present application. Figure 3 In the power combiner shown, the isolation circuit may include a capacitor C1, a resistor R1 and a capacitor C2 connected in series. Here, the selection and value of the capacitor C1, the resistor R1 and the capacitor C2 may be determined according to the actual application scenario. For example, a resistor R1 with a lower power level may be selected to achieve circuit miniaturization. This is not limited here. Figure 3 As shown, the isolation circuit composed of capacitor C1, resistor R1 and capacitor C2 in series is connected between the second connection ends of power tubes PA1 and PA2. When the circuit is working, the isolation circuit composed of capacitor C1, resistor R1 and capacitor C2 in series can improve the isolation between power tubes PA1 and PA2, thereby suppressing the subharmonic self-excitation between two adjacent power amplifier circuits. The circuit structure is simple and has strong applicability. Here, resistor R1 can be used to improve the isolation between power amplifier circuit 1 and power amplifier circuit 2, and capacitor C1 and capacitor C2 can be used to prevent direct current from passing through, thereby eliminating the leakage current on resistor R1, avoiding the problem of increased power consumption of resistor R1 caused by leakage current, and maintaining good isolation between power amplifier circuit 1 and power amplifier circuit 2. Optional, please refer to Figure 4 , Figure 4 is another schematic diagram of the structure of the power combiner provided by the present application. Figure 4 The isolation circuit in the power combiner shown in the figure can use a single-sided capacitor C1 and a resistor R1 in series to maintain good isolation. Figure 3 The isolation circuit shown can compress the circuit space, reduce the number of components, and realize circuit miniaturization.
[0036] In the present application, based on an isolation circuit composed of a resistor and at least one capacitor in series, adjacent power amplifier circuits can be isolated within a limited circuit space, thereby effectively avoiding the self-excitation of subharmonics and the problem of high power consumption caused by leakage current in the isolation circuit. The circuit structure is simple, the circuit can be miniaturized, the power density can be improved, and the applicability is high.
[0037] In some feasible implementations, the isolation circuit is composed of a resistor, a first capacitor, a second capacitor and a third capacitor, wherein the first capacitor and the second capacitor are connected in series at both ends of the resistor, and the third capacitor is connected in parallel with the resistor. Figure 5 , Figure 5 is another schematic diagram of the structure of the power combiner provided by the present application. Figure 5 In the power combiner shown, the isolation circuit may include capacitor C1, capacitor C2, capacitor C3 and resistor R1. Here, the selection and value of capacitor C1, capacitor C2, capacitor C3 and resistor R1 can be determined according to the actual application scenario and are not limited here. Figure 5 As shown, the two ends of the resistor R1 are connected in series with capacitors C1 and C2, respectively, and capacitor C3 and resistor R1 are connected in parallel. When the circuit is working, the isolation circuit can improve the isolation between the power tubes PA1 and PA2, thereby suppressing the subharmonic self-excitation between the two adjacent power amplifier circuits. The circuit structure is simple and has strong applicability. Here, compared with Figure 3 The isolation circuit shown can optimize circuit performance by introducing a capacitor C3 connected in parallel with the resistor R1, making the frequency band range of signal processing applicable to the isolation circuit more flexible.
[0038] In some feasible implementations, the isolation circuit is composed of an inductor and at least one capacitor connected in series. Figure 6 , Figure 6 is another schematic diagram of the structure of the power combiner provided by the present application. Figure 6 In the power combiner shown, the isolation circuit may include a capacitor C1, an inductor L1 and a capacitor C2 connected in series. Here, the selection and value of the capacitor C1, the capacitor C2 and the inductor L1 can be determined according to the actual application scenario and are not limited here. Figure 6 In the power synthesizer shown, an isolation circuit consisting of a capacitor C1, an inductor L1 and a capacitor C2 connected in series is connected between the second connection terminals of the power tubes PA1 and PA2. When the circuit is working, the isolation circuit can improve the isolation between the power tubes PA1 and PA2, thereby suppressing the subharmonic self-excitation between the two adjacent power amplifier circuits. The circuit structure is simple and has strong applicability. The isolation circuit consisting of a capacitor C1, an inductor L1 and a capacitor C2 connected in series can avoid the problem of high power consumption caused by leakage current in the isolation circuit. At the same time, using an inductor instead of a resistor to implement the isolation circuit can enhance the flexibility of the selection of the components of the isolation circuit, and can be applied to more application scenarios, with strong applicability. Optional, please refer to Figure 7 , Figure 7 is another schematic diagram of the structure of the power combiner provided by the present application. Figure 7 The isolation circuit in the power combiner shown in the figure can use a single-sided capacitor C1 connected in series with the capacitor L1 to maintain a good isolation degree and avoid the influence of leakage current caused by the resistor on the isolation circuit. Figure 6 The isolation circuit shown can compress the circuit space, reduce the number of components, and realize circuit miniaturization.
[0039] In the present application, an isolation circuit composed of an inductor and at least one capacitor in series can improve the isolation between power amplifier circuits, thereby effectively avoiding the self-excitation of subharmonics and avoiding the problem of leakage current in the isolation circuit leading to high power consumption. At the same time, the debugging means of the circuit are enriched, the circuit structure is simple, the applicability is strong, the circuit can be miniaturized, and the power density can be improved.
[0040] In some feasible implementations, the output ends of multiple power amplifier circuits can be connected in parallel to the output end of the power combiner to share an output load, that is, multiple amplified signals output by multiple power amplifier circuits can be directly connected in parallel to form a single signal and output. Figure 7 As shown, the amplified signals 1 and 2 outputted by the power amplifier circuit 1 and the power amplifier circuit 2 can be directly connected in parallel and output an output signal. In the present application, the power combiner can adopt the method of outputting multiple power amplifier circuits in parallel, which has a simple circuit structure and can realize circuit miniaturization.
[0041] Optionally, the power amplifier circuit may further include a power synthesis circuit, and the output ends of the at least two power amplifier circuits are connected in parallel to the input ends of the power synthesis circuit, and the output end of the power synthesis circuit serves as the output end of the power synthesis circuit. The power synthesis circuit can filter and phase-adjust multiple input signals, and compared with the direct parallel connection method, synthesis through the power synthesis circuit can reduce the phase distortion of the signal and optimize the frequency response of the circuit. Here, the power synthesis circuit may include a Wilkinson power combiner, a ring combiner, etc. The specific structure can be determined according to the actual application scenario and is not limited here. Figure 8 FIG. 1 is another schematic diagram of the structure of the power combiner provided by the present application. Figure 8 As shown, the output ends of the power amplifier circuit 1 and the power amplifier circuit 2 are connected in parallel to the input end of the power synthesis circuit, and the output end of the power synthesis circuit serves as the output end of the power synthesis circuit. The power synthesizer can combine the amplified signal 1 and the amplified signal 2 into one output signal and output it through structures such as a synthesizer and a power divider (not shown in the figure). In the present application, the power synthesizer can be output through the power synthesis circuit, which can increase the power of the output signal and is suitable for more application scenarios, thereby improving the design flexibility of the circuit. At the same time, a simple circuit structure is maintained, which can realize circuit miniaturization.
[0042] In some feasible implementations, the power amplifier circuit may further include a stabilization circuit, the input end of the stabilization circuit may be used as the input end of the power amplifier circuit, and the output end of the stabilization circuit may be connected to the first connection end of the power tube, wherein the stabilization circuit may include but is not limited to high-stability components such as resistors, capacitors and inductors to reduce the impact of temperature and time changes on circuit performance. Here, the internal structure and component selection of the stabilization circuit are determined according to the actual application scenario and are not limited here.
[0043] In some feasible implementations, the above stabilization circuit may be composed of a capacitor and a resistor in parallel. For the convenience of description, the stabilization circuit composed of a capacitor and a resistor in parallel is referred to as an RC stabilization circuit (resistor-capacitor stabilization network). Here, the RC stabilization circuit can be used to improve the low-frequency gain of the power amplifier circuit and increase the working stability of the system. Please also refer to Fig. 9 , Fig. 9 is another schematic diagram of the structure of the power combiner provided by the present application. Fig. 9 The power combiner shown includes an RC stabilization circuit 1 and an RC stabilization circuit 2, wherein the input end of the RC stabilization circuit 1 is used as the input end of the power amplifier circuit 1, the input end of the RC stabilization circuit 2 is used as the input end of the power amplifier circuit 2, the output end of the RC stabilization circuit 1 is connected to the first connection end of the power tube PA1, and the output end of the RC stabilization circuit 2 is connected to the first connection end of the power tube PA2. Fig. 9 As shown, input signal 1 is input into power tube PA1 via RC stabilization circuit 1, and input signal 2 is input into power tube PA2 via RC stabilization circuit 2. RC stabilization circuit 1 and RC stabilization circuit 2 can filter input signal 1 and input signal 2 to filter out noise, thereby improving circuit stability and reducing circuit oscillation.
[0044] In the present application, the stabilization circuit can provide a stable gain for the power amplifier circuit in the entire operating frequency range, avoid the influence of gain fluctuation on signal quality, and suppress subharmonic self-excitation. At the same time, the circuit structure is simple, the circuit can be miniaturized, the power density can be improved, and the applicability is high.
[0045] In some feasible implementations, the power amplifier circuit further includes a feed inductor, and the second connection end of the power tube is connected to a DC power supply via the feed inductor. The feed inductor can be used to stabilize the output voltage, smooth the output current, and prevent parasitic oscillations, thereby improving the effectiveness of suppressing subharmonic self-excitation and helping to improve the efficiency and overall performance of the power amplifier circuit. Here, the selection of the feed inductor can be determined according to the actual application scenario and is not limited here. Please also refer to Fig.10 , Fig.10 is another schematic diagram of the structure of the power combiner provided by the present application. Fig.10 The power combiner shown includes a feeding inductor L1 and a feeding inductor L2. The feeding inductor L1 connects the second connection end of the power tube PA1 and the positive voltage end Vdd of the DC power supply. The feeding inductor L2 connects the second connection end of the power tube PA2 and the positive voltage end Vdd of the DC power supply.
[0046] In the present application, the feeding inductor is connected between the output pole of the power tube (i.e., the second connection end of the above-mentioned power tube) and the positive pole of the DC power supply, which can connect the power amplification circuit to the DC power supply, improve the response of the power amplification circuit to load changes, maintain stable voltage and current, and support the isolation circuit to suppress sub-harmonic self-oscillation. At the same time, the feeding inductor can cooperate with other components in the circuit, affect the static operating point of the power tube, improve the power density, and have high applicability.
[0047] In the present application, by means of a power combiner including an isolation circuit, the isolation degree between the power amplifier branches can be improved, thereby effectively suppressing the generation of sub-harmonic self-oscillation. At the same time, the structure of the isolation circuit is simple, the circuit miniaturization can be realized, the power density can be improved, and the applicability is high.
[0048] See Fig.11 , Fig.11 is a schematic structural diagram of the radio frequency power supply provided by the present application. As Fig.11 shown, the radio frequency power supply includes a DC power supply and a power combiner. The DC power supply can provide a stable DC power input for the power combiner to ensure the signal quality and circuit reliability. Here, the DC power supply can include one or more of a battery pack, an uninterruptible power supply (UPS), a DC power supply module, etc., which is specifically determined according to the actual application scenario and is not limited herein. Among them, a power management module (not shown in the figure) can also be integrated in the DC power supply to perform voltage regulation, current limiting, etc. to optimize the energy efficiency and system performance. The power combiner can be Figures 1 to 10 any of the power combiners shown. The circuit structure and implementation manner of the power combiner can refer to the circuit structure and implementation manner provided above Figures 1 to 10 and will not be elaborated herein. As Fig.11 shown, the power combiner can combine multiple input signals into one output signal to increase the output power. Here, a thermal management module (not shown in the figure) can also be integrated in the power combiner to increase the heat loss of the circuit, so that a large amount of heat generated by devices such as power tubes during the circuit operation can be released, thereby maintaining the performance of the devices and the reliability of the circuit operation. The thermal management module can include, but is not limited to, a heat sink, a fan, or a liquid cooling system, etc., which is specifically determined according to the actual application scenario and is not limited herein.
[0049] In the present application, based on the collaborative work of the DC power supply and the power combiner in the radio frequency power supply, the sub-harmonic self-oscillation between multiple power amplifiers can be suppressed, the total output power of the radio frequency power supply can be significantly increased, the energy loss can be reduced, the output signal quality of the radio frequency power supply can be improved, the output waveform distortion or gain mutation of the radio frequency power supply can be avoided, and at the same time, the system structure is simple and the applicability is high.
Claims
1. A power combiner, characterized in that: It comprises at least two power amplifier circuits and an isolation circuit; the output ends of the at least two power amplifier circuits are connected in parallel to the output end of the power synthesizer; the power amplifier circuit comprises a power tube and a matching circuit, the first connection end of the power tube serves as the input end of the power amplifier circuit, the second connection end of the power tube is connected to the output end of the power synthesizer through the matching circuit, and the third connection end of the power tube is grounded; wherein, one isolation circuit is connected in parallel between the second connection ends of the power tubes of any two adjacent power amplifier circuits, and the isolation circuit is composed of a resistor and a capacitor, or an inductor and a capacitor.
2. The power combiner according to claim 1, characterized in that: The isolation circuit is composed of a resistor and at least one capacitor connected in series.
3. The power combiner according to claim 1, characterized in that: The isolation circuit is composed of a resistor, a first capacitor, a second capacitor and a third capacitor; The first capacitor and the second capacitor are connected in series at both ends of the resistor, and the third capacitor and the resistor are connected in parallel.
4. The power combiner according to claim 1, characterized in that: The isolation circuit is composed of an inductor and at least one capacitor connected in series.
5. The power combiner according to any one of claims 2 to 4, further comprising a power combining circuit; The output ends of the at least two power amplifying circuits are connected in parallel to the input end of the power combining circuit, and the output end of the power combining circuit serves as the output end of the power combining circuit.
6. The power combiner according to claim 5, characterized in that: The power amplifier circuit also includes a stabilization circuit; The input end of the stabilization circuit serves as the input end of the power amplifier circuit, and the output end of the stabilization circuit is connected to the first connection end of the power tube; wherein the stabilization circuit is composed of a capacitor and a resistor in parallel.
7. The power combiner according to claim 6, characterized in that: The power amplifier circuit also includes a feeding inductor, and the second connection end of the power tube is connected to a DC power supply through the feeding inductor.
8. The power combiner according to any one of claims 1 to 7, characterized in that: The power tube comprises a metal oxide semiconductor field effect transistor, the first connection end of the power tube is a gate, the second connection end of the power tube is a drain, and the third connection end of the power tube is a source.
9. The power combiner according to any one of claims 1 to 7, characterized in that: The power tube comprises an insulated gate bipolar transistor, the first connection end of the power tube is a gate, the second connection end of the power tube is a collector, and the third connection end of the power tube is an emitter.
10. A radio frequency power supply, characterized in that: The invention comprises a direct current power supply and a power combiner as claimed in any one of claims 1 to 9.