Circuit and design method for reducing energy consumption of communication satellite

Abstract

The present application discloses a circuit and a design method for reducing the energy consumption of a communication satellite, and relates to the field of satellite communication technology. Power distribution is achieved through a branch line coupler. Since the design basis of a phase adjustment module coupled to the isolation port of the branch line coupler is derived from the simulation of the orthogonal phase difference of the branch line coupler and the impedance parameters of each power amplifier under different power states, the difference in input impedance to different power amplifiers is taken into account, and the impedance change of the second power amplifier under different input power conditions is adapted, so that the phase length of the isolation end is adjustable, and the proportion of power allocated to the second power amplifier increases with the change of impedance. Compared with the traditional fixed power distribution method, the time required for the second power amplifier and the first power amplifier to reach a common saturation state is correspondingly reduced, and the average power has a higher efficiency under the peak-to-average ratio back-off, thereby achieving the purpose of reducing link power consumption while ensuring communication quality.

Description

Technical Field

[0001] The present application relates to the field of satellite communication technology, and in particular to a circuit for reducing energy consumption of a communication satellite and a design method thereof. Background Art

[0002] With the increasingly urgent business needs of satellite-to-ground communications and the development of star network construction, the development of low-orbit communication satellites is increasingly inclined to 5G direct connection with ground terminals, or even 5G direct connection with ground mobile phone terminals. This means that the communication system of low-orbit communication satellites must be compatible with 5G high peak-to-average ratio OFDM signals to meet the needs of high-speed data transmission.

[0003] However, in order to be compatible with high peak-to-average ratio signals and meet the EI RP requirements of the satellite payload downlink, the satellite downlink will inevitably operate at a high back-off condition, which will greatly increase the power consumption of the satellite payload downlink. Summary of the invention

[0004] The main purpose of this application is to provide a circuit and a design method for reducing the energy consumption of a communication satellite, aiming to solve the problem of high power consumption of a satellite payload downlink in the prior art.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of the present application are as follows:

[0006] In a first aspect, an embodiment of the present application provides a circuit for reducing energy consumption of a communication satellite, comprising: a branch line coupler, a first input matching section, a second input matching section, and a phase adjustment module; wherein:

[0007] The branch line coupler has four ports, namely an input port, a through port, an isolation port and a coupling port. The through port is coupled with the input end of the first input matching section, the coupling port is coupled with the input end of the second input matching section, the output end of the first input matching section is used to couple with the input end of the first power amplifier, the output end of the second input matching section is used to couple with the input end of the second power amplifier, and the isolation port is coupled with the input end of the phase adjustment module;

[0008] The phase adjustment module is obtained based on the orthogonal phase difference of the branch line coupler and the impedance parameter simulation of the first power amplifier and the second power amplifier under different power states. The phase adjustment module is used to adjust the phase length after the second power amplifier starts working so that the power proportion allocated to the second power amplifier increases with the change of impedance until the second power amplifier and the first power amplifier reach a common saturation state.

[0009] In a possible implementation manner of the first aspect, a design method of a phase adjustment module includes the following steps:

[0010] Simulating according to the orthogonal phase difference of the branch line coupler and the impedance parameters of the first power amplifier and the second power amplifier under different power states to obtain the phase length of the phase adjustment module;

[0011] According to the phase length of the phase adjustment module, an adjustment parameter of the phase adjustment module is determined to obtain the phase adjustment module.

[0012] In a possible implementation manner of the first aspect, the phase adjustment module includes a microstrip line or a phase shifter, and an adjustment parameter of the phase adjustment module is determined according to a phase length of the phase adjustment module to obtain the phase adjustment module, including:

[0013] According to the phase length of the phase adjustment module, the length parameter of the microstrip line or the phase length parameter of the phase shifter is determined to obtain the phase adjustment module.

[0014] In a possible implementation of the first aspect, before simulating according to the orthogonal phase difference of the branch line coupler and the impedance parameters of the first power amplifier and the second power amplifier in different power states to obtain the phase length of the phase adjustment module, the design method of the phase adjustment module further includes:

[0015] The impedance parameters of the second power amplifier in different power states are obtained according to the impedance parameters of the second power amplifier in the first power state and the second power state when the second power amplifier is used for class C bias.

[0016] In a possible implementation of the first aspect, the circuit further includes a first power amplifier and a second power amplifier, the output end of the first input matching section is coupled to the input end of the first power amplifier, and the output end of the second input matching section is coupled to the input end of the second power amplifier.

[0017] In a possible implementation manner of the first aspect, the circuit further includes two output matching sections, and input ends of the output matching sections are respectively coupled to output ends of the first power amplifier and the second power amplifier.

[0018] In a possible implementation manner of the first aspect, the circuit further includes an impedance converter, two input ends of the impedance converter are respectively coupled to an output end of an output matching section, and the output end of the impedance converter serves as an output end of the circuit.

[0019] In a second aspect, an embodiment of the present application provides a method for designing a circuit for reducing energy consumption of a communication satellite, which is used to obtain the circuit for reducing energy consumption of a communication satellite provided in any one of the first aspects above, comprising the following steps:

[0020] Simulating according to the orthogonal phase difference of the branch line coupler and the impedance parameters of the first power amplifier and the second power amplifier under different power states to obtain the phase length of the phase adjustment module;

[0021] Determining an adjustment parameter of the phase adjustment module according to the phase length of the phase adjustment module to obtain the phase adjustment module;

[0022] Adjust the adjustment parameters of the phase adjustment module to debug the power amplifier of the circuit;

[0023] According to the first input matching section, the second input matching section, the debugging result, the branch line coupler and the phase adjustment module, a circuit for reducing the energy consumption of a communication satellite is obtained.

[0024] In a possible implementation of the second aspect, before simulating according to the orthogonal phase difference of the branch line coupler and the impedance parameters of the first power amplifier and the second power amplifier in different power states to obtain the phase length of the phase adjustment module, the design method further includes:

[0025] The power distribution is simulated according to the initial distribution ratio to obtain a branch line coupler.

[0026] In a possible implementation manner of the second aspect, after adjusting the adjustment parameters of the phase adjustment module to debug the power amplifier of the circuit, the design method further includes:

[0027] Based on the Doherty design, a power amplifier and an output circuit are obtained; wherein the power amplifier includes a first power amplifier and a second power amplifier, and the output circuit includes an output matching section and an impedance converter;

[0028] According to the first input matching section, the second input matching section, the debugging result, the branch line coupler and the phase adjustment module, a circuit for reducing the energy consumption of a communication satellite is obtained, including:

[0029] According to the first input matching section, the second input matching section, the debugging result, the branch line coupler, the phase adjustment module, the power amplifier and the output circuit, a circuit for reducing the energy consumption of the communication satellite is obtained.

[0030] Compared with the prior art, the beneficial effects of this application are:

[0031] The embodiment of the present application proposes a circuit and a design method for reducing the energy consumption of a communication satellite. Power distribution is achieved through a branch line coupler. The input matching section obtains a corresponding matching circuit according to the input impedance and is used to connect different power amplifiers to achieve different types of bias. Since a phase adjustment module is coupled to the isolation port of the branch line coupler, and the design basis of the phase adjustment module is derived from the simulation of the orthogonal phase difference of the branch line coupler and the impedance parameters of each power amplifier under different power states, the difference in input impedance to different power amplifiers is taken into account, and the impedance change of the second power amplifier under different input power conditions is adapted, so that the phase adjustment module can adjust the phase length so that the proportion of power allocated to the second power amplifier increases with the change of impedance. Since the allocated power increases dynamically with the impedance, compared with the traditional fixed power allocation method, the time required for the second power amplifier and the first power amplifier to reach a common saturation state is correspondingly reduced, and the average power has a higher efficiency under the peak-to-average ratio back-off, thereby achieving the purpose of reducing link power consumption while ensuring communication quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a Doherty circuit in the prior art;

[0033] Figure 2 A schematic diagram of the structure of a circuit for reducing energy consumption of a communication satellite provided in an embodiment of the present application;

[0034] Figure 3 A simulation principle block diagram of the change of peak power amplifier gate impedance with input power in a circuit for reducing energy consumption of a communication satellite provided in an embodiment of the present application;

[0035] Figure 4 A simulation result diagram of the change of gate impedance with input power after the peak power amplifier is turned on in the circuit for reducing energy consumption of a communication satellite provided in an embodiment of the present application;

[0036] Figure 5 A simulation principle block diagram of a circuit for reducing energy consumption of a communication satellite provided in an embodiment of the present application;

[0037] Figure 6 A diagram showing simulation results of a circuit for reducing energy consumption of a communication satellite provided in an embodiment of the present application;

[0038] Figure 7 A principle block diagram of a circuit for reducing energy consumption of a communication satellite provided in order to verify the embodiment of the present application;

[0039] Figure 8 A comparison diagram of the efficiency of a circuit for reducing energy consumption of a communication satellite provided in an embodiment of the present application and a Doherty circuit in the prior art;

[0040] Fig. 9A flowchart of a method for designing a circuit for reducing energy consumption of a communication satellite provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] With the increasingly urgent business needs of satellite-to-ground communications and the development of satellite network construction, the development of low-orbit communication satellites is increasingly inclined to 5G direct connection with ground terminals, or even 5G direct connection with ground mobile phone terminals. This means that the communication system of low-orbit communication satellites must be compatible with 5G high-peak-average-ratio OFDM signals to meet the needs of high-speed data transmission. However, in order to be compatible with high-peak-average-ratio signals and meet the requirements of satellite payload downlink EIRP, the satellite downlink will inevitably work in a high back-off situation, which will greatly increase the power consumption of the satellite payload downlink, and the power consumption of the satellite communication payload is mainly determined by its downlink.

[0043] Therefore, the existing technology has combined the Doherty power amplifier high-efficiency technology with the pre-distortion technology and applied it to the downlink of the load to improve the overall efficiency and signal quality. Figure 1 As shown, it includes an input circuit, a power amplifier, and an output circuit. The input circuit mainly includes a power division network and an input matching section. The power division network divides the input signal into two signals according to a certain power division ratio and phase relationship. In order to simplify the design, it is usually set to equal proportion distribution; the input matching section is a matching circuit obtained according to the input impedance of the power amplifier tube; the power amplifier involves two amplifiers, one of which is called the main power amplifier and the other is called the peak power amplifier. The main power amplifier is usually biased in class AB and the peak power amplifier is usually biased in class C. The output ends of the two power amplifiers are matched to 50 ohms.

[0044] When the power amplifier is in small signal operation, only the main power amplifier is working. As the input power increases and reaches a certain threshold, the peak power amplifier starts to work. The output circuit includes an output matching section and an impedance transformation network. Through impedance transformation, the main power amplifier is in a high impedance state under small signal conditions, so it maintains a high efficiency under certain back-off conditions (theoretically, the output power capabilities of the main power amplifier and the peak power amplifier are P m and P p Then the total power is reduced by {20log[P m / (P m +P p )]}dB under the condition of high efficiency and saturation power). At high power output, through active impedance pulling, the output impedance of the main power amplifier and the peak power amplifier is pulled to 50 ohms, and the power combined amplifier output power reaches the theoretical P m +P pThe above is the main working principle of the traditional Doherty amplifier.

[0045] The traditional input power splitter structure needs to be m and P p The power amplifier outputs saturated power at the same time, so a fixed ratio P is adopted m :P p Power division, and add isolation resistance to the power divider to ensure isolation characteristics. Since the working states of the main power amplifier and the peak power amplifier are different and are mainly determined by their gate voltages, the gate voltage affects the gate impedance of the power amplifier, and the process of the peak power amplifier gradually turning on with the input power is also a gradual change of the gate impedance. Therefore, the original fixed power division state cannot adapt to this dynamic change process, resulting in the high efficiency state and saturated power output state in the fallback state cannot achieve the theoretical effect.

[0046] Therefore, the design idea of ​​the present application is to optimize the input circuit structure of the Doherty circuit to adapt to the different gate impedances of the Doherty power amplifier main power amplifier and the peak power amplifier, and to adapt to the dynamic process of gate resistance change from low input power to high input power peak power amplifier, so that the Doherty power amplifier has higher efficiency in average power under peak-to-average ratio back-off; at saturated output, the main power amplifier and the peak power amplifier reach saturation state synchronously to adapt to the calibration state of digital pre-distortion and optimize communication quality.

[0047] See attached Figure 2 The embodiment of the present application provides a circuit for reducing energy consumption of a communication satellite, comprising: a branch line coupler, a first input matching section, a second input matching section and a phase adjustment module; wherein:

[0048] The branch line coupler has four ports, namely an input port, a through port, an isolation port and a coupling port. The through port is coupled to the input end of the first input matching section, the coupling port is coupled to the input end of the second input matching section, the output end of the first input matching section is used to couple with the input end of the first power amplifier, the output end of the second input matching section is used to couple with the input end of the second power amplifier, and the isolation end is coupled with the input end of the phase adjustment module; the phase adjustment module is obtained according to the orthogonal phase difference of the branch line coupler and the impedance parameters of the first power amplifier and the second power amplifier under different power states. The phase adjustment module is used to adjust the phase length after the second power amplifier starts to work so that the proportion of power allocated to the second power amplifier increases with the change of impedance until the second power amplifier and the first power amplifier reach a common saturation state.

[0049] In the specific implementation process, the branch line coupler is a four-port microwave device, and the two output ports, namely the through port and the coupled port, have a phase difference of 90°, which is also called a branch line bridge and is commonly used for power distribution and synthesis. The first power amplifier and the second power amplifier are the main power amplifier and the peak power amplifier, respectively, and work in class AB and class C, respectively. There is a large difference in input impedance. As the input peak power amplifier increases, the peak power amplifier impedance is a changing state, and the traditional power division network cannot adapt to this dynamic process due to the fixed output and the increase of the corresponding isolation resistance.

[0050] The input matching section is a matching circuit obtained according to the input impedance, and the corresponding one is the output matching section, which are respectively coupled to the input and output ends of the power amplifier. In the embodiment of the present application, the first input matching section corresponds to the first power amplifier, and the second input matching section corresponds to the second power amplifier.

[0051] The phase adjustment module has components with adjustable phase length function, which are coupled to the isolation end of the branch line coupler, so that the isolation end becomes phase-adjustable. Since the phase adjustment module is obtained based on the orthogonal phase difference of the branch line coupler and the impedance parameters of the first power amplifier and the second power amplifier under different power states, its phase adjustment ability can adapt to the dynamic change of input impedance, and the power distribution ratio also changes accordingly. In the high-efficiency state, the branch line coupler distributes more power to the main power amplifier, and after the power reaches the threshold value, the peak power amplifier starts to work, the input impedance changes, which in turn causes the power distribution ratio to change and biased towards the peak power amplifier, and finally reaches the ideal state of common saturation.

[0052] Simply put, under the fixed ratio distribution of conventional circuits, if the power distribution of the main power amplifier and the peak power amplifier is 5:5, then in the circuit of the present application, the peak power amplifier has a larger proportion and may be distributed as 4:6. After the peak power amplifier is turned on, it will promote the phase adjustment module, so that it can further promote the proportion of power distribution to be more inclined to the peak power amplifier as the impedance changes.

[0053] In one embodiment, the circuit further includes a first power amplifier and a second power amplifier, the output of the first input matching section is coupled to the input of the first power amplifier, and the output of the second input matching section is coupled to the input of the second power amplifier.

[0054] In the specific implementation process, since the aforementioned circuit can only serve as the input circuit of the complete circuit, in order to obtain the power amplification function based on the efficiency of the Doherty design, the power amplifiers are coupled in the circuit, which are respectively a first power amplifier coupled to the first input section and a second power amplifier coupled to the second input matching section. The circuit design of the Doherty amplifier uses a main power amplifier, which is usually biased for class AB operation, and the second active device is a peak amplifier, which is usually biased for class C operation. The signal enters the entire Doherty power amplifier and is presented to the splitter, which will produce two signals that are 90° phase-shifted from each other. The reason is that the inductor divider is used to reduce power loss, thereby producing a 90° phase shift between the two signals. One output is provided to the main power amplifier and one to the peak amplifier, which is biased so that it only starts to operate when a large peak occurs that the main power amplifier itself cannot accommodate.

[0055] Based on the same inventive concept as in the above-mentioned embodiment, as shown in the attached Fig. 9 As shown, an embodiment of the present application also provides a method for designing a circuit for reducing energy consumption of a communication satellite, which is used to obtain the circuit for reducing energy consumption of a communication satellite provided in an embodiment of the present application, comprising the following steps:

[0056] S00: simulating power distribution according to the initial distribution ratio to obtain a branch line coupler;

[0057] S10: performing simulation according to the orthogonal phase difference of the branch line coupler and the impedance parameters of the first power amplifier and the second power amplifier under different power states to obtain the phase length of the phase adjustment module;

[0058] S20: Determine an adjustment parameter of the phase adjustment module according to the phase length of the phase adjustment module to obtain the phase adjustment module.

[0059] In the specific implementation process, it is first necessary to simulate the branch line coupler according to the initial distribution ratio. The branch line coupler can be simulated at a certain power distribution ratio, such as the same ratio in a conventional circuit, or a bridge with a specific power distribution ratio. The bridge here is a branch line bridge, that is, a branch line coupler. The purpose of step S10 and step S20 is to obtain a phase adjustment module, that is, a design method for a phase adjustment module, combining the S parameters of the branch line coupler or bridge, that is, the orthogonal phase difference and the impedance parameters of the main power amplifier and the peak power amplifier in two different states. The simulation process is used to accurately determine the phase length of the phase adjustment module at the isolation end such as the input matching node, the branch line coupler topology, and the branch line coupler or bridge.

[0060] As attached Figure 5As shown, in order to verify the principle of the present application, a simulation principle block diagram is designed by integrating peak power amplifier matching and power division network to optimize the Doherty power amplifier; the principle block diagram shows that the main power amplifier is biased in class AB and the peak power amplifier is biased in class C; the power division network adopts the S parameters of a bridge or branch line coupler, and the isolation end can adjust the microstrip line length. The main power amplifier and the peak power amplifier are at the same output matching section, but at different input matching sections, as the input signal source increases, the output states of the main power amplifier and the peak power amplifier are obtained.

[0061] In one embodiment, before simulating the orthogonal phase difference of the branch line coupler and the impedance parameters of the first power amplifier and the second power amplifier in different power states to obtain the phase length of the phase adjustment module, the design method of the phase adjustment module further includes:

[0062] The impedance parameters of the second power amplifier in different power states are obtained according to the impedance parameters of the second power amplifier in the first power state and the second power state when the second power amplifier is used for class C bias.

[0063] In the specific implementation process, in the process of designing the phase adjustment module, in order to make the obtained phase change adapt to the impedance change under different states, how to extract the peak power amplifier input impedance is the key. The peak power amplifier C-type bias low power state, that is, the input impedance under the first power state and the peak power amplifier C-type bias high power conduction state, that is, the input impedance under the second power state, are extracted respectively. The extraction method adopts the Souce-pull source traction technology or the relevant data provided by the power amplifier manufacturer. As shown in the attached Figure 3 As shown, to verify the principle of this application, the peak power amplifier is in the corresponding input matching section and output matching section under Class C bias, the input power source gradually increases, and the gate impedance changes with the input power. Figure 4 As shown, to verify the principle of this application, the simulation results of the gate impedance changing with input power after the peak power amplifier is turned on at high power; its coordinate system is the original impedance diagram, the horizontal axis represents the real part of the impedance, and the coordinates of the surrounding circle are the imaginary part of the impedance, and its value is normalized to 50Ω. It can be found that as the input signal source power increases, the impedance point and the gate impedance change continuously, as shown in the middle coil, and the above conclusions are drawn, that is, the gate impedance changes with the input power.

[0064] More specifically, the phase adjustment module can be a microstrip line or a phase shifter. The microstrip line is a microwave transmission line composed of a single conductor strip supported on a dielectric substrate; and the phase shifter is a device that can directly adjust the phase; correspondingly, the adjustment parameter of the phase adjustment module is the length of the microstrip line or the phase length parameter of the phase shifter, that is, adjusting the length of the microstrip line or the phase length parameter of the phase shifter can directly adjust the phase length of the isolation end. That is: according to the phase length of the phase adjustment module, the adjustment parameter of the phase adjustment module is determined to obtain the phase adjustment module, including:

[0065] According to the phase length of the phase adjustment module, the length parameter of the microstrip line or the phase length parameter of the phase shifter is determined to obtain the phase adjustment module.

[0066] S30: adjusting the adjustment parameters of the phase adjustment module to debug the power amplifier of the circuit;

[0067] S40: A circuit for reducing energy consumption of a communication satellite is obtained according to the first input matching section, the second input matching section, the debugging result, the branch line coupler and the phase adjustment module.

[0068] After the phase adjustment module is designed, it needs to be debugged. According to the general Doherty amplifier debugging process, the adjustment parameters can be continuously adjusted, that is, the microstrip line length or the phase length of the phase shifter can be continuously adjusted. The debugging result requires the circuit to achieve a better working state of the Doherty amplifier. Based on this result, the coupling connection between the first input matching section, the second input matching section, the branch line coupler, and the phase adjustment module is completed, and the circuit design is realized. As shown in the attached figure Figure 6 As shown in the figure, in order to verify the principle of this application, the simulation results of the peak power amplifier matching and the power division network are designed to optimize the Doherty power amplifier. Figure 5 Based on the circuit schematic diagram, the peak power amplifier can be quickly turned on to achieve the effect that the main power amplifier and the peak power amplifier are saturated together, wherein L1 represents the input / output curve of the traditional Doherty circuit, and L2 represents the input / output curve of the Doherty circuit of the present application.

[0069] As attached Figure 7 As shown in the figure, in order to verify the principle of the application, the principle block diagram of the improved Doherty circuit is used to verify the improvement of efficiency under average power. The principle block diagram shows that the main power amplifier is biased in class AB and the peak power amplifier is biased in class C; the power division network uses a bridge or branch line coupler S parameter, and the isolation end can adjust the microstrip line length. The main power amplifier and the peak power amplifier are in the same output matching section, and the efficiency curve under different input matching sections under output average power. Further as shown in the attached figure Figure 8As shown, in order to verify the principle of the present application, the efficiency curve of the improved Doherty circuit is compared with the original Doherty efficiency curve, wherein M1 represents the efficiency curve of the traditional Doherty circuit at a specific output power, and M2 represents the efficiency curve of the Doherty circuit of the present application at a specific output power. It can be seen that under high efficiency conditions, the present application has an efficiency advantage of 2% to 3% over the original Doherty circuit.

[0070] In one embodiment, after adjusting the adjustment parameters of the phase adjustment module to debug the power amplifier of the circuit, the design method further includes:

[0071] Based on the Doherty design, a power amplifier and an output circuit are obtained; wherein the power amplifier includes a first power amplifier and a second power amplifier, and the output circuit includes an output matching section and an impedance converter;

[0072] According to the first input matching section, the second input matching section, the debugging result, the branch line coupler and the phase adjustment module, a circuit for reducing the energy consumption of a communication satellite is obtained, including:

[0073] According to the first input matching section, the second input matching section, the debugging result, the branch line coupler, the phase adjustment module, the power amplifier and the output circuit, a circuit for reducing the energy consumption of the communication satellite is obtained.

[0074] In the specific implementation process, the output circuit of the circuit design based on the Doherty amplifier adopts the Doherty design to ensure the high efficiency of the circuit. Since the input circuit is connected by two transmission lines with different characteristic impedances, reflection will occur. Therefore, one or more transmission lines can be inserted between the two transmission lines that need to be matched. It is usually called an impedance converter. The two input ends of the impedance converter are respectively coupled with the output end of an output matching section. The impedance converter pulls the output impedance of the main power amplifier and the peak power amplifier to the same 50 ohms. The output end of the impedance converter serves as the output end of the circuit. The power synthesis amplifier output power reaches the theoretical state, thus forming a complete circuit based on the Doherty amplifier.

[0075] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0076] The above sequence of the embodiments of the present application is for description only and does not represent the advantages or disadvantages of the embodiments.

[0077] In summary, the circuit and design method for reducing the energy consumption of communication satellites described in the present application realize power distribution through a branch line coupler, and the input matching section obtains the corresponding matching circuit according to the input impedance, and is used to connect different power amplifiers to achieve different types of bias. Since the phase adjustment module is coupled to the isolation port of the branch line coupler, and the design basis of the phase adjustment module is derived from the simulation of the orthogonal phase difference of the branch line coupler and the impedance parameters of each power amplifier under different power states, the input impedance difference to different power amplifiers is taken into account, and the impedance change of the second power amplifier under different input power conditions is adapted, so that the phase adjustment module can adjust the phase length so that the proportion of the power allocated to the second power amplifier increases with the change of impedance. Since the allocated power increases dynamically with the impedance, compared with the traditional fixed power allocation method, the time required for the second power amplifier and the first power amplifier to reach a common saturation state is correspondingly reduced, and the average power has a higher efficiency under the peak-to-average ratio back-off, thereby achieving the purpose of reducing link power consumption while ensuring communication quality.

[0078] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A circuit for reducing energy consumption of a communication satellite, characterized in that: include: A branch line coupler, a first input matching section, a second input matching section, a phase adjustment module, a first power amplifier and a second power amplifier; wherein: The branch line coupler has four ports, namely an input port, a through port, an isolation port and a coupling port, the through port is coupled with the input end of the first input matching section, the coupling port is coupled with the input end of the second input matching section, the output end of the first input matching section is coupled with the input end of the first power amplifier, the output end of the second input matching section is coupled with the input end of the second power amplifier, and the isolation port is coupled with the input end of the phase adjustment module; The phase adjustment module is obtained based on the orthogonal phase difference of the branch line coupler and the impedance parameter simulation of the first power amplifier and the second power amplifier under different power states. The phase adjustment module is used to adjust the phase length after the second power amplifier starts working so that the power proportion allocated to the second power amplifier increases with the change of impedance until the second power amplifier and the first power amplifier reach a common saturation state.

2. The circuit for reducing energy consumption of a communication satellite according to claim 1, characterized in that: The design method of the phase adjustment module comprises the following steps: Simulating according to the orthogonal phase difference of the branch line coupler and the impedance parameters of the first power amplifier and the second power amplifier under different power states to obtain the phase length of the phase adjustment module; According to the phase length of the phase adjustment module, an adjustment parameter of the phase adjustment module is determined to obtain the phase adjustment module.

3. The circuit for reducing energy consumption of a communication satellite according to claim 2, characterized in that: The phase adjustment module includes a microstrip line or a phase shifter, and determining the adjustment parameter of the phase adjustment module according to the phase length of the phase adjustment module to obtain the phase adjustment module includes: According to the phase length of the phase adjustment module, a length parameter of the microstrip line or a phase length parameter of the phase shifter is determined to obtain the phase adjustment module.

4. The circuit for reducing energy consumption of a communication satellite according to claim 2, characterized in that: Before simulating according to the orthogonal phase difference of the branch line coupler and the impedance parameters of the first power amplifier and the second power amplifier in different power states to obtain the phase length of the phase adjustment module, the design method of the phase adjustment module further includes: The impedance parameters of the second power amplifier in different power states are obtained according to the impedance parameters of the second power amplifier in a first power state and a second power state respectively when the second power amplifier is used for class C bias.

5. The circuit for reducing energy consumption of a communication satellite according to claim 1, characterized in that: The circuit further includes two output matching sections, input ends of which are respectively coupled to output ends of the first power amplifier and the second power amplifier.

6. The circuit for reducing energy consumption of a communication satellite according to claim 5, characterized in that: The circuit further comprises an impedance converter, two input ends of the impedance converter are respectively coupled to an output end of the output matching section, and the output end of the impedance converter serves as the output end of the circuit.

7. A method for designing a circuit for reducing energy consumption of a communication satellite, characterized in that: A circuit for reducing energy consumption of a communication satellite according to any one of claims 1 to 6, comprising the following steps: Simulating according to the orthogonal phase difference of the branch line coupler and the impedance parameters of the first power amplifier and the second power amplifier under different power states to obtain the phase length of the phase adjustment module; Determining an adjustment parameter of the phase adjustment module according to the phase length of the phase adjustment module to obtain the phase adjustment module; Adjusting the adjustment parameters of the phase adjustment module to debug the power amplifier of the circuit; The circuit for reducing the energy consumption of a communication satellite is obtained according to the first input matching section, the second input matching section, the debugging result, the branch line coupler and the phase adjustment module.

8. The method for designing a circuit for reducing energy consumption of a communication satellite according to claim 7, characterized in that: Before simulating according to the orthogonal phase difference of the branch line coupler and the impedance parameters of the first power amplifier and the second power amplifier in different power states to obtain the phase length of the phase adjustment module, the design method further includes: The power distribution is simulated according to the initial distribution ratio to obtain the branch line coupler.

9. The method for designing a circuit for reducing energy consumption of a communication satellite according to claim 7, characterized in that: After adjusting the adjustment parameters of the phase adjustment module to debug the power amplifier of the circuit, the design method further includes: Based on Doherty design, a power amplifier and an output circuit are obtained; wherein the power amplifier includes the first power amplifier and the second power amplifier, and the output circuit includes an output matching section and an impedance converter; The circuit for reducing energy consumption of a communication satellite is obtained according to the first input matching section, the second input matching section, the debugging result, the branch line coupler and the phase adjustment module, including: The circuit for reducing energy consumption of a communication satellite is obtained according to the first input matching section, the second input matching section, the debugging result, the branch line coupler, the phase adjustment module, the power amplifier and the output circuit.

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