Satellite power amplifier system with high-precision power control

Abstract

The invention discloses a satellite power amplifier system with high-precision power control, a 3dB bridge is used for realizing any input port and output signal so that a radio frequency link A and a radio frequency link B which are isolated from each other can respond to signal output, a power supply module A is arranged in the radio frequency link A, a power supply module B is arranged in the radio frequency link B, and the power supply module A is connected with the power supply module B; the power supply module A and the power supply module B are in mutual redundant backup, so that the radio frequency link A and the radio frequency link B can work independently and / or simultaneously, and the output ends of the radio frequency link A, the radio frequency link B, the power supply module A and the power supply module B are electrically connected with the spaceborne computer. The power amplifier modules with different transmitting powers and different efficiencies are selected in practical application, high-precision power compensation and control of the power amplifier modules in different temperature environments are achieved, open circuit state detection is achieved, and circuit devices are protected to the maximum extent.

Description

Technical Field

[0001] The invention relates to the technical field of satellite communication equipment control, and in particular to a satellite power amplifier system with high-precision power control. Background Art

[0002] With the rapid development of my country's aerospace industry, various satellite communication equipment has gradually matured, the application of satellite communication technology has become more and more comprehensive, and more and more frequency bands are used. For different communication frequency bands, more RF power amplifier transmission link designs are used. The power amplifier products may have a large operating temperature range, which may easily lead to large fluctuations in transmission power and inaccurate power control. At the same time, higher requirements are placed on high reliability and life span. Summary of the invention

[0003] The purpose of the present invention is to provide a satellite power amplifier system with high-precision power control, which effectively solves the technical problems existing in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions.

[0005] A high-precision power-controlled satellite power amplifier system, characterized in that it includes a 3dB bridge, a radio frequency link A, a radio frequency link B, a power module A and a power module B, the 3dB bridge is used to realize any input port, and the output signal enables the mutually isolated radio frequency link A and radio frequency link B to both respond to the signal output, the radio frequency link A is provided with a power module A, the radio frequency link B is provided with a power module B, the power module A and the power module B are mutually redundantly backed up, so that the radio frequency link A and the radio frequency link B can work independently and / or simultaneously, and the output ends of the radio frequency link A, the radio frequency link B, the power module A and the power module B are all electrically connected to the onboard computer.

[0006] Preferably, the RF link A and the RF link B are configured identically, both including a voltage-controlled attenuator, an amplifier, a filter, a coupler, a detector, a circulator, a plurality of power amplifier modules, a power detection module and a temperature compensation module, wherein the voltage-controlled attenuator is used to receive the output control voltage of the power control loop to achieve a final output power of the target power; the amplifier and the filter combination realize signal amplification and filtering; the coupler is used to realize output power detection and circulator echo power detection; the circulator is used to realize echo power absorption and protect the amplifier of the previous stage, and at the same time cooperates with the detector to realize the open-circuit transmission status indication back to the onboard computer; the power amplifier module is used to output power; the power detection module and the temperature compensation module are used to select the power amplifier modules with different transmission powers and different efficiencies in actual applications, so as to realize high-precision power compensation and control of the power amplifier modules under different temperature environments.

[0007] Preferably, the power module A and the power module B are configured identically, both comprising a DC-DC isolated power module, a DC-DC non-isolated power chip, an LDO power chip, a MOS tube, a triode, a current detection chip and a temperature detection chip. The DC-DC isolated power module and the DC-DC non-isolated power chip provide power for each functional module; the MOS tube is used to achieve surge current suppression; the triode is used to achieve power-on timing control of the power amplifier module; the current detection chip is used to detect current, and its output voltage is transmitted back to the onboard computer; the temperature detection chip is used to detect temperature, and its output voltage is transmitted back to the onboard computer.

[0008] Preferably, the selection of the power detection module and the temperature compensation module by the power amplifier module in practical application includes the following situations:

[0009] If the output power of the final power amplifier module is less than 30dBm, the power detection module can be used to achieve power control;

[0010] If the output power of the final power amplifier module is greater than 40dBm, a temperature compensation module can be used to achieve power control;

[0011] If the power of the final amplifier module is between 30dBm and 40dBm, you can choose it according to the actual efficiency of the amplifier module.

[0012] Preferably, the temperature compensation module includes multiple operational amplifiers and multiple temperature sensors with different temperature curves. The temperature sensors with different temperature curves are output to the operational amplifier, and through basic operations of the temperature sensors with different temperature curves, they are finally output to the integrating operational amplifier of the power control loop, so that the control voltage of this loop can have curve or broken line characteristics as the temperature changes. After targeted hardware debugging, the power changes at all temperatures of the system can be accurately compensated.

[0013] Preferably, when the output port of the 3dB bridge has no load or the matching state deteriorates, the echo power detected by the detector after the circulator increases, and the onboard computer makes corresponding power-off protection according to its own state, and chooses whether to shut down the power supply and signal input of this power amplifier module.

[0014] Preferably, the DC-DC isolated power supply module is provided with surge suppression units at the input and output where large current passes, so as to reduce the impact on the power supply bus of the entire star externally and reduce the current impact on the power amplifier module when it is powered on internally.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The present invention uses a 3dB bridge to realize any input port, and the output signal enables the mutually isolated RF link A and RF link B to respond to the signal output. The RF link A is provided with a power module A, and the RF link B is provided with a power module B. The power module A and the power module B are mutually redundant, so that the RF link A and the RF link B can work independently and / or simultaneously. The output ends of the RF link A, the RF link B, the power module A and the power module B are all electrically connected to the onboard computer. The present invention can adapt to different frequencies and different powers, provides a variety of compatible power control methods, and has open circuit state detection, protects circuit components to the greatest extent, has the characteristics of high-precision power control, high reliability, and high stability, and improves the overall service life of the power amplifier system.

[0017] (2) The power module A and the power module B of the present invention are configured identically, and the MOS tubes of the power module A and the power module B are used to achieve surge current suppression; the transistor is used to achieve the control of the power-on timing of the power amplifier module, and the DC-DC isolation power module is provided with surge suppression units at the input and output where large current passes for surge suppression protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an overall block diagram of the present invention;

[0019] Figure 2 It is a flow chart of the power module A and the power module B of the present invention;

[0020] Figure 3 It is a schematic diagram of the temperature compensation module flow of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0022] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] like Figures 1 to 3 As shown, a satellite power amplifier system with high-precision power control includes a 3dB bridge, a radio frequency link A, a radio frequency link B, a power module A and a power module B. The 3dB bridge is used to realize any input port, and the output signal enables the mutually isolated radio frequency link A and radio frequency link B to both respond to the signal output. The radio frequency link A is provided with a power module A, and the radio frequency link B is provided with a power module B. The power module A and the power module B are redundantly backed up with each other, so that the radio frequency link A and the radio frequency link B can work independently and / or simultaneously. The output ends of the radio frequency link A, the radio frequency link B, the power module A and the power module B are all electrically connected to the onboard computer.

[0025] The present invention has a simple structure, can adapt to different frequencies and different powers, provides a variety of compatible power control methods, and has open circuit state detection, which protects circuit components to the greatest extent. It has the characteristics of high-precision power control, high reliability, and high stability, and improves the overall service life of the power amplifier system.

[0026] RF link A and RF link B have the same settings, both including a voltage-controlled attenuator, an amplifier, a filter, a coupler, a detector, a circulator, multiple power amplifier modules, a power detection module and a temperature compensation module. The voltage-controlled attenuator is used to receive the output control voltage of the power control loop to achieve the final output power as the target power; the amplifier and the filter are combined to achieve signal amplification and filtering; the coupler is used to achieve output power detection and circulator echo power detection; the circulator is used to achieve echo power absorption and protect the amplifier of the previous stage, and at the same time cooperate with the detector to realize the open-circuit transmission status indication back to the onboard computer; the power amplifier module is used to output power;

[0027] The power detection module and the temperature compensation module are used to select power amplifier modules with different transmission powers and different efficiencies in actual applications, to achieve high-precision power compensation and control of the power amplifier modules in different temperature environments, so that the output signal power of the power amplifier modules remains consistent at different temperatures, and can adapt to various transmission powers and frequency bands.

[0028] Specifically, the selection of the power detection module and the temperature compensation module by the power amplifier module in practical applications includes the following situations:

[0029] If the output power of the final power amplifier module is less than 30dBm, the power detection module can be used to achieve power control;

[0030] If the output power of the final power amplifier module is greater than 40dBm, a temperature compensation module can be used to achieve power control;

[0031] If the power of the final amplifier module is between 30dBm and 40dBm, you can choose it according to the actual efficiency of the amplifier module.

[0032] The power module A and the power module B are configured in the same way, both including a DC-DC isolated power module, a DC-DC non-isolated power chip, an LDO power chip, a MOS tube, a triode, a current detection chip and a temperature detection chip. The DC-DC isolated power module and the DC-DC non-isolated power chip provide power for each functional module; the MOS tube is used to suppress surge current; the triode is used to control the power-on timing of the power amplifier module; the current detection chip is used to detect current, and its output voltage is transmitted back to the onboard computer; the temperature detection chip is used to detect temperature, and its output voltage is transmitted back to the onboard computer. In the attached drawings of this embodiment, the onboard computer is used as an example as the final output receiving end. In actual application, the output power of the output end of the power module A and the power module B can also be transmitted back to the power control unit.

[0033] In this embodiment, the DC-DC isolated power supply module is equipped with surge suppression units at the input and output of the high current point for surge suppression protection, which reduces the impact on the power supply bus of the entire satellite externally and reduces the current impact on the power amplifier module when it is powered on internally, protecting the power amplifier module. The timing control of the power supply of the power amplifier module by the DC-DC isolated power supply module can adapt to the common power-on logic of high-power power amplifier chips and effectively protect the normal operation of the power amplifier module. The bus takes power and supplies it to various internal subsystems after passing through the internal DC-DC isolated power supply module. There are surge suppression circuits or power supply timing control circuits at different key positions to ensure that the power amplifier module will not affect the power supply environment of the entire satellite bus.

[0034] The temperature compensation module includes multiple operational amplifiers and multiple temperature sensors with different temperature curves. The temperature sensors with different temperature curves are output to the operational amplifier. Through basic operations of the temperature sensors with different temperature curves, they are finally output to the integrating operational amplifier of the power control loop, so that the control voltage of this loop can have curve or broken line characteristics with temperature changes. After targeted hardware debugging, the power changes at all temperatures of the system can be accurately compensated.

[0035] The structure and calculation method of the temperature compensation module can be combined with different operational amplifier calculation methods for cyclic superposition, which can improve the complexity, adaptability and adjustability of the voltage change curve.

[0036] When there is no load at the output port of the 3dB bridge or the matching status deteriorates, the echo power detected by the detector after the circulator increases. The onboard computer makes corresponding power-off protection according to its own status and chooses whether to shut down the power supply and signal input of this power amplifier module.

[0037] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of rights of the present invention. Therefore, modifications, equivalent changes, improvements, etc. made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A satellite power amplifier system with high-precision power control, characterized in that: It includes a 3dB bridge, a radio frequency link A, a radio frequency link B, a power module A and a power module B. The 3dB bridge is used to realize any input port, and the output signal enables the mutually isolated radio frequency link A and radio frequency link B to respond to the signal output. The radio frequency link A is provided with a power module A, and the radio frequency link B is provided with a power module B. The power module A and the power module B are redundantly backed up by each other, so that the radio frequency link A and the radio frequency link B can work independently and / or simultaneously. The output ends of the radio frequency link A, the radio frequency link B, the power module A and the power module B are all electrically connected to the onboard computer.

2. A satellite power amplifier system with high-precision power control according to claim 1, characterized in that: The RF link A and RF link B are configured identically, and both include a voltage-controlled attenuator, an amplifier, a filter, a coupler, a detector, a circulator, a plurality of power amplifier modules, a power detection module, and a temperature compensation module. The voltage-controlled attenuator is used to receive the output control voltage of the power control loop to achieve a final output power of the target power; the amplifier and filter combination achieves signal amplification and filtering; the coupler is used to achieve output power detection and circulator echo power detection; the circulator is used to achieve echo power absorption and protect the amplifier of the previous stage, and at the same time cooperates with the detector to realize the open-circuit transmission status indication back to the onboard computer; the power amplifier module is used to output power; the power detection module and the temperature compensation module are used to select the power amplifier modules with different transmission powers and different efficiencies in actual applications, so as to achieve high-precision power compensation and control of the power amplifier modules under different temperature environments.

3. A satellite power amplifier system with high-precision power control according to claim 2, characterized in that: The power module A and the power module B are configured identically, and both include a DC-DC isolated power module, a DC-DC non-isolated power chip, an LDO power chip, a MOS tube, a triode, a current detection chip, and a temperature detection chip. The DC-DC isolated power module and the DC-DC non-isolated power chip provide power for each functional module; the MOS tube is used to suppress inrush current; the triode is used to control the power-on timing of the power amplifier module; the current detection chip is used to detect current, and its output voltage is transmitted back to the onboard computer; the temperature detection chip is used to detect temperature, and its output voltage is transmitted back to the onboard computer.

4. A satellite power amplifier system with high-precision power control according to claim 3, characterized in that: The selection of the power detection module and the temperature compensation module by the power amplifier module in practical applications includes the following situations: If the output power of the final power amplifier module is less than 30dBm, the power detection module can be used to achieve power control; If the output power of the final power amplifier module is greater than 40dBm, a temperature compensation module can be used to achieve power control; If the power of the final amplifier module is between 30dBm and 40dBm, you can choose it according to the actual efficiency of the amplifier module.

5. The satellite power amplifier system with high-precision power control according to claim 3, characterized in that: The temperature compensation module includes multiple operational amplifiers and multiple temperature sensors with different temperature curves. The temperature sensors with different temperature curves are output to the operational amplifier. Through basic operations of the temperature sensors with different temperature curves, the temperature sensors are finally output to the integrating operational amplifier of the power control loop, so that the control voltage of this loop can have curve or broken line characteristics as the temperature changes. After targeted hardware debugging, the power changes at all temperatures of the system can be accurately compensated.

6. A satellite power amplifier system with high-precision power control according to claim 5, characterized in that: When the output port of the 3dB bridge has no load or the matching state deteriorates, the echo power detected by the detector after the circulator increases, and the onboard computer makes corresponding power-off protection according to its own state, and chooses whether to shut down the power supply and signal input of this power amplifier module.

7. A satellite power amplifier system with high-precision power control according to claim 6, characterized in that: The DC-DC isolated power supply module is provided with surge suppression units at the input and output where large current passes, so as to reduce the impact on the power supply bus of the whole star externally and reduce the current impact on the power amplifier module when it is powered on internally.

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