Eight-path power synthesis device

Abstract

The utility model relates to the technical field of microwave power sources, in particular to an eight-path power synthesis device mainly applied to an accelerator power source system. The eight-path power synthesis device comprises eight paths of input ports, one path of output port and eight paths of power synthesis units, and each path of power synthesis unit is connected to a coaxial change-over switch; each coaxial change-over switch is provided with at least three ports which are respectively used for connecting the corresponding input ports, the short circuiters and the input ends of the power synthesis units; according to the invention, by automatically adjusting the configuration of the input port of the power combiner, the power transmission path is optimized, the power reflection and loss are reduced, the power combining efficiency is improved, and the performance of a solid-state power source is fully exerted.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of microwave power sources, in particular to an 8-way power synthesis device mainly applied to an accelerator power source system. BACKGROUND

[0002] In the technical field of microwave power sources, solid-state radio frequency power sources have become an important choice, and a power amplifier module redundancy design is adopted to ensure stable operation. However, power amplifier module failure will cause power imbalance at the input end of a power synthesizer, affecting power synthesis efficiency and the reliability of the whole machine. The prior art lacks automatic adaptation capability and needs manual adjustment, increasing the complexity of maintenance and unstable factors. Moreover, the traditional power synthesizer is difficult to meet the demand of varying power levels. Therefore, a device capable of adjusting the input port configuration of the power synthesizer is needed. SUMMARY

[0003] In view of the above problems, the application aims to provide an 8-way power synthesis device capable of adjusting the input port configuration of the power synthesizer and mainly applied to an accelerator power source system.

[0004] The technical scheme adopted by the application to solve the technical problems is as follows: an 8-way power synthesis device, which comprises 8 input ports, 1 output port and 8 power synthesis units, each power synthesis unit being connected to a coaxial switch; 8 coaxial switches, each coaxial switch having at least three ports for connecting the corresponding input port, short circuit device and input end of the power synthesis unit.

[0005] The 8-way power synthesis device further comprises 8 short circuit devices, each short circuit device being connected to a port of the corresponding coaxial switch.

[0006] The electrical length from the input end of the power synthesis unit to the short circuit device is required to be N*1 / 2 wavelength, N being an integer.

[0007] The internal network structure of the power synthesis unit comprises a first-stage synthesis network, a second-stage synthesis network and a third-stage synthesis network, each synthesis network adopting an impedance transformation structure.

[0008] The impedance and electrical length of a specific arm in the power synthesis unit meet preset conditions to realize power synthesis, wherein the impedance of at least two arms is 50Ω and the electrical length is 1 / 4 wavelength of the input radio frequency signal, and the impedance of at least one arm is 35.35Ω and the electrical length is 1 / 4 wavelength of the input radio frequency signal.

[0009] The coaxial switch is a three-port switch, one port of which is connected to the input port, one port is connected to the short circuit device, and the other port is connected to the input end of the power synthesis unit.

[0010] The output end of the power combining unit is connected to the output port, for outputting the combined radio frequency signal.

[0011] The combining network inside the power combining unit can be designed as a microstrip line, a strip line or other forms of combining structure, as long as the electrical length and impedance meet the preset conditions.

[0012] The impedance of the 8-way input port and the 1-way output port is 50Ω.

[0013] The beneficial effects of the present application are mainly reflected in the following aspects: the utility model discloses a state of the power amplifier module is detected automatically, and the input port configuration of power combiner is adjusted automatically according to the state change, effectively avoid the power imbalance phenomenon caused by power amplifier module fault, thereby the stability and reliability of solid-state power supply system are improved;Meanwhile, by automatically adjusting the input port configuration of power combiner, the power transmission path is optimized, the power reflection and loss are reduced, the power combining efficiency is improved, and the performance of solid-state power supply is fully utilized. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the logic structure schematic diagram of the 8-way power combining device with automatic switching function in the application.

[0015] Figure 2 It is the combining network structure schematic diagram of the 8-way power combining unit in the application. DETAILED DESCRIPTION

[0016] The specific embodiment of the utility model is described in detail in combination with the drawings of the specification as follows:

[0017] An 8-way power combining device mainly applied to accelerator power supply system, as shown in Figures 1-2 An 8-way power combining device mainly applied to accelerator power supply system, which can automatically detect the state of power amplifier module and adjust the input port configuration of power combiner, to improve the stability and reliability of the system.

[0018] I. Device structure

[0019] Input port and output port: the device is provided with 8-way input ports for connecting 8 power amplifier modules of solid-state power supply, and 1-way output port for outputting the combined radio frequency signal.

[0020] Power combining unit: the power combining unit is responsible for combining the signals of each input port and outputting from the output port. The internal network structure of the combining unit is composed of first-stage combining network, second-stage combining network and third-stage combining network, as shown in Figure 2The impedance and electrical length requirements are as follows:

[0021] The impedance of the two arms in the synthesis unit is 50Ω, and the electrical length is 1 / 4 wavelength of the input radio frequency signal.

[0022] The impedance of the No. 3 arm in the synthesis unit is 35.35Ω, and the electrical length is 1 / 4 wavelength of the input radio frequency signal.

[0023] The impedance of the No. 4 arm in the synthesis unit is 50Ω, and the electrical length has no specific requirements.

[0024] The output end of the power synthesis unit is connected to the output port.

[0025] Coaxial switch: provided with 8 coaxial switches, each switch having three ports for connecting the corresponding input port, short circuit and input end of the power synthesis unit. The coaxial switch is a three-port switch responsible for switching the connection state when the power amplifier module is normal or faulty.

[0026] Short circuit: provided with 8 short circuits, each short circuit connected to the port of the corresponding coaxial switch. The short circuit is used to short the input end of the synthesis device when the power amplifier module fails to ensure the power balance of the remaining input ports.

[0027] Power detection unit: the power detection unit is used to detect the incident power of the input port of the synthesis device, and to decide whether to switch the coaxial switch according to the detected radio frequency power.

[0028] II. Electrical length and impedance design

[0029] The electrical length requirement from the input end of the power synthesis unit to the short circuit is N*1 / 2 wavelength (N is an integer) to ensure the best synthesis efficiency of the synthesizer. The synthesis network inside the power synthesis unit can be designed as a microstrip line, a strip line or other forms of synthesis structure, as long as the electrical length and impedance meet the preset conditions.

[0030] III. Working principle

[0031] Normal working state: when the 8 power amplifier modules are all working normally, the 8 input ports are connected to the output radio frequency signals of the power amplifier modules. The synthesis unit synthesizes the signals of each input port and outputs the synthesized radio frequency signal from the output port.

[0032] Fault switching state: When the power detection unit detects that a certain input port has no power or very little power, it sends a switching signal to the corresponding coaxial switch. After receiving the switching signal, the coaxial switch automatically switches from the power amplifier port to the short circuit port, short-circuiting the input end. The remaining input ports of the synthesis device maintain power balance, automatically completing the mode switching of the number of input ports of the synthesis device. At this time, the output power of the normal working power amplifier module is mainly output from the output port of the synthesis device, reducing the reflected power of each input port and improving the power synthesis efficiency.

[0033] Mode switching and efficiency improvement: The synthesis device proposed in the present application can be flexibly switched to a seven-in-one, six-in-one, five-in-one, four-in-one, etc. different working mode synthesizer. When the synthesis device is switched to a seven-in-one or six-in-one synthesizer, the synthesis efficiency is higher than 97%.

[0034] When any port power amplifier module fails, the port power amplifier module can also be pulled out of the synthesizer input end, and then the input port is connected to a coaxial transmission line (or phase shifter), and the other end of the coaxial transmission line is connected to a short circuit. The electrical length from the input end of the synthesis unit to the short circuit surface is required to be N*1 / 2 wavelength (N is an integer) to ensure the best synthesis efficiency of the synthesizer.

[0035] In summary, the 8-way power synthesis device of the present application effectively improves the stability and reliability of the solid-state power source system by automatically detecting the state of the power amplifier module and adjusting the input port configuration of the power synthesizer, while optimizing the power transmission path, reducing power reflection and loss, and improving the power synthesis efficiency. The device has the advantages of compact structure, easy integration, convenient maintenance, etc., and is suitable for various application scenarios such as accelerator power source systems.

[0036] The following is a specific embodiment of the present application, which further illustrates the working principle and process of the 8-way power synthesis device of the present application. This embodiment is provided with 8 input ports, marked as Input1 to Input8. Each input port is connected to a solid-state power amplifier module, and the module outputs a radio frequency signal to the corresponding input port. The power synthesis unit of this embodiment includes three levels of synthesis networks: first, second and third levels. Each level of synthesis network adopts an impedance transformation structure, and the specific configuration is as follows:

[0037] In the first and second level synthesis networks, the impedance of part of the arms (such as arms ① and ②) is 50Ω, and the electrical length is 1 / 4 wavelength of the input radio frequency signal.

[0038] In the third level synthesis network, the impedance of a specific arm (such as arm ③) is 35.35Ω, and the electrical length is 1 / 4 wavelength of the input radio frequency signal. The output end of the synthesis unit is connected to the output port Output.

[0039] The embodiment is provided with 8 coaxial switches, respectively marked as Switch1 to Switch8. Each switch has three ports: one connected to the input port, one connected to the short circuit, and the other connected to the input of the power combining unit. The embodiment is provided with 8 short circuits, respectively marked as Short1 to Short8. Each short circuit is connected to the port of the corresponding coaxial switch. The power detection unit of the embodiment is responsible for monitoring the incident power of each input port. When it is detected that a certain input port has no power or the power is lower than the threshold, a switching signal is sent. In the embodiment, when all the power amplifier modules are working normally, 8 input ports are connected to the incident radio frequency signal. The power combining unit combines the signals of each input port and outputs the combined radio frequency signal from the output port Output. At this time, the coaxial switches are connected between the input port and the power combining unit. Assuming that the power amplifier module connected to Input1 fails, the power detection unit detects that Input1 has no power or very low power. The power detection unit sends a switching signal to Switch1. After receiving the switching signal, Switch1 automatically switches from connecting Input1 to connecting Short1, short-circuiting Input1. At this time, the remaining 7 input ports of the combining device maintain power balance, automatically completing the mode switching from 8-in-1 to 7-in-1. The output power of the normally working power amplifier module is mainly output from the output port Output, reducing the reflected power of each input port and improving the power combining efficiency. With the automatic switching function, the invention can flexibly cope with the failure of the power amplifier module, maintaining the stability and reliability of the system. In the 7-in-1, 6-in-1 and other modes, the combining efficiency is higher than 97%, significantly improving the performance of the power source system.

[0040] In summary, the 8-way power combining device of the embodiment effectively improves the stability and reliability of the solid-state power source system by automatically detecting the state of the power amplifier module and adjusting the input port configuration of the power combiner. At the same time, the power transmission path is optimized, the power reflection and loss are reduced, and the power combining efficiency is improved. The device is suitable for various application scenarios such as accelerator power source systems, and has broad application prospects.

Claims

1. An 8-way power combining device, characterized by: The 8-way power combining device includes 8-way input ports, 1-way output port, 8-way power combining units, each of which is connected to a coaxial switch; 8 coaxial switches, each of which has at least three ports for connecting the corresponding input port, short circuiter and input end of the power combining unit.

2. The 8-way power combining device of claim 1, wherein: It also includes 8 short circuiters, each of which is connected to the port of the corresponding coaxial switch.

3. An 8-way power combining device as claimed in claim 1 or 2, characterized in that: The electrical length requirement from the input of the power combining unit to the short circuit is wavelength, N is an integer.

4. The 8-way power combining device of claim 1, wherein: The internal network structure of the power combining unit includes first, second and third level combining networks, each of which adopts impedance transformation structure.

5. An 8-way power combining device according to claim 4, characterised in that: The impedance and electrical length of the specific arm in the power combining unit meet the preset conditions to realize power combining, at least including two arms with 50Ω impedance and 1 / 4 wavelength of the input radio frequency signal, and at least one arm with 35.35Ω impedance and 1 / 4 wavelength of the input radio frequency signal.

6. The 8-way power combining device of claim 1, wherein: The coaxial switch is a three-port switch, one port of which is connected to the input port, one port is connected to the short circuiter, and the other port is connected to the input end of the power combining unit.

7. The 8-way power combining device of claim 1, wherein: The output end of the power combining unit is connected to the output port for outputting the combined radio frequency signal.

8. The 8-way power combining device of claim 1, wherein: The combining network inside the power combining unit can be designed as a microstrip line or a strip line combining structure, as long as the electrical length and impedance meet the preset conditions.

9. The 8-way power combining device of claim 1, wherein: The impedance of the 8-way input port and the 1-way output port is 50Ω.

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