A solid-state power source power combiner

Abstract

The present invention discloses a power combiner for a solid-state power source, which includes a first-stage combiner, a second-stage combiner, a third-stage combiner, and a fourth-stage combiner. The third-stage combiner is provided with two, including the third-stage combiner one and the third-stage combiner two. The power combiner of the solid-state power source of the present invention adopts a synthesis network. Even when the amplitude consistency of the input power amplifier module of the power combiner is poor, and the last two stages adopt a non-isolated synthesis network, most of the unbalanced power will be absorbed by the front isolation resistor, and the remaining small part of the power is optimized through the last two-stage synthesis network, so that it is evenly borne by the absorption load of the input module, thereby greatly improving the stability of the system. In the power combiner of the solid-state power source of the present invention, the input ports of the Gysel synthesis network adopted in the first two stages are isolated from each other, and the isolation resistor can be grounded after being led to any position through the transmission line, thus facilitating the installation and the design of the heat dissipation system, and therefore it is more suitable for high-power synthesis.

Description

Technical Field

[0001] The present invention relates to a power combiner, specifically a power combiner for a solid-state power source. Background Art

[0002] A power combiner uses multiple power amplifier circuits to amplify an input signal simultaneously, and then tries to add the output signals of each power amplifier. In this way, the total output power obtained can be much greater than the output power of a single power amplifier circuit. High-power solid-state power sources are usually formed by power vector addition of dozens of basic power amplifier modules through a power combining network.

[0003] Currently, in the field of accelerators, the solid-state power sources commonly use a 1 / 4-wavelength impedance transformation coaxial multi-stage power combining network ( Figure 1 ). This combining network has a simple structure and various combination forms, but the isolation degree between input power amplifier modules is poor, resulting in poor anti-matching ability of the entire solid-state power source. Especially when the amplitude consistency of the input power amplifier modules of the power combiner is poor, the power amplifier modules are easily damaged due to excessive reflected power; while the Wilkinson power combiner with isolation resistors ( Figure 2 ), although it has good port isolation, because the isolation resistors are embedded in the combining network, it requires a relatively small insertion phase shift to reduce the influence of distributed parameters on the network impedance matching. This limits the position and size of the isolation resistors. When there is power imbalance at the input port, the circuit is easily burned out, so it is not suitable for high-power combination (generally less than 100W), far from meeting the requirements of high-power combination. Based on this, we propose a power combiner for a solid-state power source to optimize it. Summary of the Invention

[0004] The purpose of the present invention is to provide a power combiner for a solid-state power source to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A power combiner for a solid-state power source includes a first-stage combiner, a second-stage combiner, a third-stage combiner, and a fourth-stage combiner. The first-stage combiner is provided with eight, including First-stage Combiner One, First-stage Combiner Two, First-stage Combiner Three, First-stage Combiner Four, First-stage Combiner Five, First-stage Combiner Six, First-stage Combiner Seven, and First-stage Combiner Eight. The second-stage combiner is provided with four, including Second-stage Combiner One, Second-stage Combiner Two, Second-stage Combiner Three, and Second-stage Combiner Four. The third-stage combiner is provided with two, including Third-stage Combiner One and Third-stage Combiner Two.

[0007] As a further solution of the present invention: the output ends of the first - stage synthesizer one and the first - stage synthesizer two are both connected to the input end of the second - stage synthesizer one, and the output end of the second - stage synthesizer one is connected to the input end of the third - stage synthesizer one.

[0008] As a further solution of the present invention: the output ends of the first - stage synthesizer three and the first - stage synthesizer four are both connected to the input end of the second - stage synthesizer two, and the output end of the second - stage synthesizer two is connected to the input end of the third - stage synthesizer one.

[0009] As a further solution of the present invention: the output end of the third - stage synthesizer one is connected to the input end of the fourth - stage synthesizer.

[0010] As a further solution of the present invention: the output ends of the first - stage synthesizer five and the first - stage synthesizer six are both connected to the input end of the second - stage synthesizer three, and the output end of the second - stage synthesizer three is connected to the input end of the third - stage synthesizer two.

[0011] As a further solution of the present invention: the output ends of the first - stage synthesizer seven and the first - stage synthesizer eight are both connected to the input end of the second - stage synthesizer four, and the output end of the second - stage synthesizer four is connected to the input end of the third - stage synthesizer two.

[0012] As a further solution of the present invention: the output end of the third - stage synthesizer two is connected to the input end of the fourth - stage synthesizer.

[0013] As a further solution of the present invention: in the power synthesizer composed of the first - stage synthesizer, the second - stage synthesizer, the third - stage synthesizer and the fourth - stage synthesizer, there are a total of four - stage synthesis networks. The first two stages adopt Gysel synthesis networks, and the last two stages adopt non - isolated co - direction synthesis networks.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. By adopting a synthesis network in the power synthesizer of the solid - state power source of the present invention, even when the amplitude consistency of the input power amplifier modules in the power synthesizer is poor and the last two stages adopt non - isolated synthesis networks, most of the unbalanced power will be absorbed by the front - end isolation resistors, and the remaining small part of the power is optimized by the last two - stage synthesis networks so that it is evenly borne by the absorption loads of the input modules, thus greatly improving the stability of the system and further meeting the requirements of high - power synthesis.

[0016] 2. In the power combiner of the solid-state power source of the present invention, the input ports of the Gysel combiner network used in the first two stages are isolated from each other. The isolation resistors can be grounded after being led to any position through transmission lines, which facilitates installation and the design of the heat dissipation system. Therefore, it is more suitable for high-power combination. At the same time, the maximum combination of the two stages is 8 kW, so a suspension strip line rather than a rigid coaxial cable can be used to achieve this, making the system more compact. The latter two stages optimize the non-isolated co-directional combiner used for combination, and select an appropriate electrical length so that the phase difference of the signals from different input ports to other ports is π, thus canceling each other out and maximizing the port isolation. The present invention has good port isolation and at the same time maximally maintains the simplicity of the combiner network structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is a schematic diagram of a multi-stage power combiner network for impedance transformation based on a 1 / 4 wavelength.

[0018] Figure 2 FIG. is a schematic diagram of a two-way Wilkinson power combiner circuit.

[0019] Figure 3 FIG. is a schematic diagram of a four-stage combiner network in the power combiner of the solid-state power source.

[0020] Figure 4 FIG. is a schematic diagram of the first two-stage combiner network in the power combiner of the solid-state power source.

[0021] Figure 5 FIG. is a schematic diagram of the last two-stage combiner network in the power combiner of the solid-state power source. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figures 1 to 5 , in the embodiments of the present invention, a power combiner for a solid-state power source includes a first-stage combiner, a second-stage combiner, a third-stage combiner, and a fourth-stage combiner. The first-stage combiner is provided with eight, including the first-stage combiner one, the first-stage combiner two, the first-stage combiner three, the first-stage combiner four, the first-stage combiner five, the first-stage combiner six, the first-stage combiner seven, and the first-stage combiner eight. The second-stage combiner is provided with four, including the second-stage combiner one, the second-stage combiner two, the second-stage combiner three, and the second-stage combiner four. The third-stage combiner is provided with two, including the third-stage combiner one and the third-stage combiner two.

[0024] The output terminals of the first - stage synthesizer one and the first - stage synthesizer two are both connected to the input terminal of the second - stage synthesizer one, and the output terminal of the second - stage synthesizer one is connected to the input terminal of the third - stage synthesizer one.

[0025] The output terminals of the first - stage synthesizer three and the first - stage synthesizer four are both connected to the input terminal of the second - stage synthesizer two, and the output terminal of the second - stage synthesizer two is connected to the input terminal of the third - stage synthesizer one.

[0026] The output terminal of the third - stage synthesizer one is connected to the input terminal of the fourth - stage synthesizer.

[0027] The output terminals of the first - stage synthesizer five and the first - stage synthesizer six are both connected to the input terminal of the second - stage synthesizer three, and the output terminal of the second - stage synthesizer three is connected to the input terminal of the third - stage synthesizer two.

[0028] The output terminals of the first - stage synthesizer seven and the first - stage synthesizer eight are both connected to the input terminal of the second - stage synthesizer four, and the output terminal of the second - stage synthesizer four is connected to the input terminal of the third - stage synthesizer two.

[0029] The output terminal of the third - stage synthesizer two is connected to the input terminal of the fourth - stage synthesizer.

[0030] The first - stage synthesizer one, the first - stage synthesizer two, the first - stage synthesizer three, the first - stage synthesizer four, the first - stage synthesizer five, the first - stage synthesizer six, the first - stage synthesizer seven and the first - stage synthesizer eight are all first - stage synthesizers of the same specification. The second - stage synthesizer one, the second - stage synthesizer two, the second - stage synthesizer three and the second - stage synthesizer four are all second - stage synthesizers of the same specification. The third - stage synthesizer one and the third - stage synthesizer two are all third - stage synthesizers of the same specification.

[0031] The input terminal of the first - stage synthesizer is used to receive the power input from the basic power amplifier module. The output terminal of the fourth - stage synthesizer is the total output terminal, which is used for the output of the entire solid - state power source. The basic power module is 2kW, and for a 30kW / 500MHz solid - state power source, it is composed of 16 power modules superimposed through a synthesis network.

[0032] In the power synthesizer composed of the first - stage synthesizer, the second - stage synthesizer, the third - stage synthesizer and the fourth - stage synthesizer, there are a total of four - stage synthesis networks. The first two stages adopt the Gysel synthesis network (as Figure 4 shown), and the last two stages adopt the non - isolated co - direction synthesis network (as Figure 5 shown).

[0033] As Figure 4As shown in the upper left black box in [reference], A-B / B-C / C-D / D-E / E-F / F-A are all 1 / 4 wavelengths. The phase shift of the signal passing through 1 / 4 wavelength is π / 2. P1 / P2 are the input powers, and the two R0 are isolation resistors that can absorb the unbalanced power of P1 / P2. The power combining principle is as follows: The phase shifts of the input signals from different paths to the output end are the same. The path of P1 from the A-B path to the output end is 1 / 4 wavelength, and the corresponding phase shift is π / 2. The path length from A-F-E-D-C-B to the output end is 5 / 4 wavelengths, and its corresponding phase shift is also π / 2. The phase shift of the signal of P2 to the output end is also π / 2. In this way, the two input signals are perfectly superimposed at the output end; the phase difference between one input signal from different paths to the other input signal is π, which just cancels out, thus ensuring the mutual isolation of the two input ports. The path length of P1 from the A-B-C path to the other input end P2 is 1 / 2 wavelength, and its corresponding phase shift is π. The path length of P1 from the A-F-E-D-C path to the other input end P2 is 1 wavelength, and its corresponding phase shift is 2π. The phase difference between the two signals from different paths to P2 is π, and the amplitudes of the two signals are the same, so the superimposed signal is 0, thus ensuring the mutual isolation of the two input ports; the phase difference between the two input signals to the absorption load is π. The phase shift of P1 from the A-F path to isolation resistor 1 is 1 / 2π, while the phase shift of P2 from the C-D-E-F path to absorption isolation resistor 1 is 3 / 2π. Similarly, the phase difference between the other paths to isolation resistor 1 and isolation resistor 2 is also π. Therefore, when the two input signals P1 and P2 are completely equal, the power absorbed in the absorption load is 0. Therefore, in an ideal situation, all the input power is combined and output at the output end.

[0034] Due to the complex structure of the Gysel synthesis in high-power situations and the problem of difficult heat dissipation of the isolation resistors, the latter two stages adopt a conventional non-isolated co-directional synthesis network and are improved to maintain the simplicity of the synthesis network structure, as Figure 5 shown in [reference], by selecting an appropriate inter-stage electrical length, the length of P22 from the A-B-C path to P21 is 1 / 2 wavelength + 2a, and the length of P23 from the F-E-D-B-C path to P21 is 2 wavelengths + 2a. In this way, the phase difference reaching P21 is π, so they can cancel each other out, improving the isolation degree of the ports.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A solid-state power source power combiner, comprising a first-stage combiner, a second-stage combiner, a third-stage combiner and a fourth-stage combiner, characterized in that: The first - stage synthesizer is provided with eight components, including the first - stage synthesizer one, the first - stage synthesizer two, the first - stage synthesizer three, the first - stage synthesizer four, the first - stage synthesizer five, the first - stage synthesizer six, the first - stage synthesizer seven, and the first - stage synthesizer eight. The second - stage synthesizer is provided with four components, including the second - stage synthesizer one, the second - stage synthesizer two, the second - stage synthesizer three, and the second - stage synthesizer four. The third - stage synthesizer is provided with two components, including the third - stage synthesizer one and the third - stage synthesizer two. The first - stage to fourth - stage synthesizers form a four - stage synthesis network, where the first two stages adopt the Gysel synthesis network, and the last two stages adopt the non - isolated co - directional synthesis network. The isolation resistors of the Gysel synthesis network are led to the grounded position through transmission lines to absorb the unbalanced power of the input power amplifier module. The inter - stage electrical length of the non - isolated co - directional synthesis network is configured such that the signal phase difference from the input port to other ports is π, so as to cancel each other out and improve the isolation degree.

2. The solid-state power source power combiner according to claim 1, wherein: The output terminals of the first - stage synthesizer one and the first - stage synthesizer two are both connected to the input terminal of the second - stage synthesizer one, and the output terminal of the second - stage synthesizer one is connected to the input terminal of the third - stage synthesizer one.

3. The solid-state power source power combiner according to claim 1, characterized in that: The output terminals of the first - stage synthesizer three and the first - stage synthesizer four are both connected to the input terminal of the second - stage synthesizer two, and the output terminal of the second - stage synthesizer two is connected to the input terminal of the third - stage synthesizer one.

4. The solid-state power source power combiner according to claim 1, characterized in that: The output terminal of the third - stage synthesizer one is connected to the input terminal of the fourth - stage synthesizer.

5. The solid-state power source power combiner according to claim 1, characterized in that: The output terminals of the first - stage synthesizer five and the first - stage synthesizer six are both connected to the input terminal of the second - stage synthesizer three, and the output terminal of the second - stage synthesizer three is connected to the input terminal of the third - stage synthesizer two.

6. The solid-state power source power combiner according to claim 1, wherein: The output terminals of the first - stage synthesizer seven and the first - stage synthesizer eight are both connected to the input terminal of the second - stage synthesizer four, and the output terminal of the second - stage synthesizer four is connected to the input terminal of the third - stage synthesizer two.

7. The solid-state power source power combiner according to claim 1, characterized in that: The output terminal of the third - stage synthesizer two is connected to the input terminal of the fourth - stage synthesizer.

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