Solid-state transmitter device

Abstract

The utility model provides a solid-state transmitter device, and relates to the technical field of wireless signals. The power amplifier comprises a pushing assembly, a plurality of power amplifier assemblies and a waveguide synthesis network. Through the optimized power synthesis design and the distributed working mode, the adjustability of the output power is realized, and the reliability and the maintainability of the system are improved; meanwhile, a combined mode of planar power synthesis and magic T waveguide synthesis is adopted, so that the width of an output frequency spectrum is effectively reduced, and the requirement of a radio administration bureau on a transmitting signal frequency spectrum is met; in addition, due to the integrated power supply design and the application of the high-efficiency power supply module, the structure of the power supply system is simplified, the power supply efficiency is improved, and the energy loss is reduced; the device is excellent in performance in a C-band dual-polarization phased-array antenna system, can keep dual-polarization consistency, realizes monopulse tracking of an aerial target, and has important application value and wide market prospect.

Description

TECHNICAL FIELD

[0001] The utility model relates to wireless signal technical field, especially a solid state transmitter device. BACKGROUND

[0002] Solid state transmitter refers to using semiconductor amplifier tube (such as gallium arsenide, gallium nitride amplifier tube) as microwave amplifier device, wherein the solid state is relative to the traditional vacuum amplifier tube, and the vacuum transmitter uses vacuum tube as amplifier device. With the mature application of gallium nitride material, the semiconductor microwave amplifier tube manufactured by gallium nitride has very high output power, which promotes the development of high-power solid state transmitter.

[0003] High-power transmitter refers to the transmitter working in S-band, C-band, X-band, with the output peak power in kW level or 10kW level, and the final stage amplification module not less than 32 groups. The characteristics of this kind of transmitter are that multiple synthesis must be carried out to meet the output power requirement, which brings the complexity of the system, and at the same time, it has large power consumption, so that the system cannot be miniaturized. This kind of transmitter has several obvious shortcomings: one is that the output power is not adjustable, two is that the fault protection and maintenance are difficult, three is that the output spectrum is wide, and four is that the power supply system is complex.

[0004] 1. The output power is not adjustable. Solid state transmitter usually carries out binary synthesis, and the number of final stage amplification modules is 16, 32, 64, etc. In order to drive a large number of final stage modules, 3 to 4 stage series power amplifier modules are needed to amplify and distribute the input signal as the input of the final stage module. In order to ensure the stability of the system, each stage power amplifier module usually works in saturation state, which leads to the fixed value of the output power of the transmitter, which is difficult to adjust.

[0005] 2. The fault protection and maintenance are difficult. Solid state transmitter uses multiple synthesis mode, and the damage of single component is difficult to detect. If it runs with disease, it is easy to lead to fault expansion. At the same time, each component needs to be closely combined together, and is usually designed as an integrated case. If a fault occurs, the whole machine often needs to be returned to the factory.

[0006] 3. The output spectrum is wide. Due to the saturation output characteristics of high-power solid state transmitter, the pulse signal is a high rectangular pulse signal, which occupies a large bandwidth in frequency domain. For pulse radar, the pulse width is τ, and the bandwidth of high rectangular pulse in frequency domain is about 40 / τ at-30dBc. 1μs is a common pulse width of radar, and if corresponding control means is not adopted, the frequency spectrum-30dBc is about 40MHz, while the relevant radio management bureau generally requires within 10MHz.

[0007] 4. The power supply system is complex. Each component of the solid-state transmitter uses low-voltage DC power supply. In order to ensure the electromagnetic compatibility performance of the product and the stability of the radio frequency signal, the transmitter usually uses DC 48V power supply, and each component obtains the required power supply through DCDC or linear voltage stabilizer. This leads to the need for a power supply cabinet (box) and other equipment.

[0008] Therefore, it is necessary to provide a solid-state transmitter device to solve the technical problems of existing high-power transmitters, such as unadjustable output power, difficult fault protection and maintenance, wide output spectrum, and complex power supply system. Utility model content

[0009] The utility model discloses a solid-state transmitter device, which is simple to operate and solves the technical problems of C-band dual-polarization phased array antenna system dual-polarization consistency difficulty to maintain and the inability to track the single pulse of the aerial target.

[0010] To achieve the above-mentioned purpose, the application provides a solid-state transmitter device, which comprises a push-pull component, a plurality of power amplifier components and a waveguide synthesis network.

[0011] The push-pull component comprises an excitation signal input end, a first push-pull amplification link, a second push-pull amplification link and an input power divider network. The excitation signal input end receives the excitation signal generated by the radar system and is electrically connected to the first push-pull amplification link and the second push-pull amplification link through two power dividers, respectively.

[0012] The first push-pull amplification link comprises a delay and phase shift component, a first push-pull amplification module and a first four-way power divider connected in sequence. The second push-pull amplification link comprises an adjustable attenuator, a second push-pull amplification module and a second four-way power divider connected in sequence. The input power divider network is provided with 8 groups of power amplifier drive input ports corresponding to the first four-way power divider and the second four-way power divider, and outputs power amplifier drive signals to the power amplifier components.

[0013] The power amplifier components are set one by one corresponding to the power amplifier drive input ports and respectively receive the corresponding output power amplifier drive signals. The power amplifier components comprise an eight-way waveguide power divider, a corresponding two-stage amplification link and an eight-way waveguide synthesizer. The input end of the eight-way waveguide power divider is electrically connected to the corresponding power amplifier drive input port.

[0014] The two-stage amplification link is provided with 8 groups and is electrically connected to the output end of the eight-way waveguide power divider, respectively. The other end of the two-stage amplification link is electrically connected to the eight-way waveguide power divider, respectively. The waveguide synthesis network is electrically connected to the output end of each eight-way waveguide power divider, respectively, receives the power amplifier output signals of the 8 groups of power amplifier components, and obtains the transmission output signal through waveguide synthesis.

[0015] As a further solution, the delay and phase shift component comprises a delay module and a phase shift module; wherein the delay module is provided by an optical fiber delay line, and the phase shift module is a manual phase shift module.

[0016] As a further solution, the two-way power divider, the first four-way power divider and the second four-way power divider of the push-pull component are all provided by suspended microstrip line power dividers.

[0017] As a further solution, the two-stage amplification link comprises an input waveguide-microstrip conversion module, a push power tube, a small isolator, a final power tube, a large isolator and an output waveguide-microstrip conversion module connected in sequence; wherein the input end of the input waveguide-microstrip conversion module is electrically connected with the eight-way waveguide power divider, and the output end of the output waveguide-microstrip conversion module is electrically connected with the eight-way waveguide combiner.

[0018] As a further solution, the first push-pull amplification module and the second push-pull amplification module are provided by the same push-pull amplification module structure; wherein the push-pull amplification module structure comprises a first amplification chip, an attenuator chip, a second amplification chip and a MEMS isolator connected in sequence.

[0019] As a further solution, the waveguide combining network is provided by a magic T waveguide combining network.

[0020] As a further solution, an input detection module, a plurality of branch detection modules and a whole machine detection module are further provided; wherein,

[0021] The input detection module, the branch detection module and the whole machine detection module all adopt the same detection module structure, comprising a directional coupler, a detection chip and an operational amplifier; wherein the directional coupler comprises a forward coupler and a reverse coupler and is electrically connected with the detection chip respectively, the detection output end of the detection chip is electrically connected with the operational amplifier, and the output end of the operational amplifier is electrically connected with the upper computer;

[0022] The excitation signal input end is provided with an input feed line, the input detection module is connected to the input feed line by means of probe coupling of the directional coupler; the output end of the eight-way waveguide power divider is provided with a branch feed line, the branch detection module is connected to the branch feed line by means of probe coupling of the directional coupler, the output end of the waveguide combining network is provided with an output feed line, and the whole machine detection module is connected to the output feed line by means of probe coupling of the directional coupler.

[0023] As a further solution, the eight-way waveguide power divider comprises an inverting power divider, a first in-phase power divider A, a first in-phase power divider B, a second in-phase power divider A1, a second in-phase power divider A2, a second in-phase power divider B1 and a second in-phase power divider B2; wherein the inverting power divider is electrically connected with the first in-phase power divider A and the first in-phase power divider B respectively, the first in-phase power divider A is electrically connected with the second in-phase power divider A1 and the second in-phase power divider A2 respectively, and the first in-phase power divider B is electrically connected with the second in-phase power divider B1 and the second in-phase power divider B2 respectively.

[0024] As a further solution, the push-pull assembly is powered by a push-pull power supply assembly, which comprises a main DC / DC module and an auxiliary DC / DC module; wherein the main DC / DC module is composed of a DC / DC module and a phase-shifted full-bridge, and the auxiliary DC / DC module is composed of a PWM controller, a flyback drive chip and a variable inductor.

[0025] As a further solution, the power amplifier assembly is powered by a power amplifier power supply assembly; wherein the power amplifier power supply assembly is set by a drain modulation circuit with timing protection, comprising a MOS modulator, a MOS tube, a rising edge series resistor, a discharge series resistor, a decoupling capacitor and an energy storage capacitor; wherein the energy storage capacitor has a capacitance value of 24500uF.

[0026] Compared with the related art, the solid-state transmitter device provided by the utility model has the following advantages:

[0027] 1、The utility model adopts the output power division of eight ways of a push-pull assembly to drive eight power amplifier assemblies to work, and finally carries out the mode of 8-way power synthesis, compared with the traditional binary synthesis mode, can more flexibly control the working state of each stage amplification module, and then realizes the regulation of output power, in addition, can also change the envelope shape of the waveguide synthesis network output signal by adjusting the phase shifter phase shift angle in the push-pull assembly, to meet the requirement of transmitting signal, realize the flexible regulation of transmitting power,

[0028] 2、The utility model adopts the distributed work of each stage amplification assembly, when a small amount of assemblies fail, only makes the output power slightly drop, but the transmitter device can still work reliably, will not lead to the complete failure of the whole system, reduces the influence degree of fault to the system, improves the reliability of the system, in addition, each assembly adopts the distributed design and is relatively independent, when a certain assembly fails, can be quickly positioned and individually replaced or repaired, need not the whole machine to return to the factory, greatly reduces the maintenance difficulty and cost, improves the maintenance efficiency,

[0029] 3. The utility model discloses a "plane power synthesis + magic T waveguide synthesis" synthesis mode is adopted on the power synthesis approach of all levels, can better control the output signal characteristic after synthesis, effectively reduces the width of output spectrum, makes it satisfy the requirement of relevant radio administration to the spectrum of transmitting signal, through the adjustment transmitting power, can optimize the spectrum characteristic of output signal to a certain extent, in addition, the utility model discloses still can under the condition of power surplus, through the adjustment low drain voltage, reaches the reduction power, reduces the heat consumption, also helps the improvement output spectrum width.

[0030] 4. The utility model discloses a main road DC / DC module adopts the phase shift full bridge circuit structure, and the maximum output power can reach 1200W, and single DC / DC module efficiency can reach 93% highest, and installs the output filter circuit, effectively reduces the output ripple noise, the auxiliary road DC / DC module adopts the flyback circuit structure, and the maximum output power is 12W, and the highest efficiency can reach 87% expected, improves the efficiency of power supply system, reduces the energy loss, also reduces the requirement to power equipment, further simplifies the power supply system. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings, which are incorporated into and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the accompanying drawings needed to be used in the embodiments or related art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without creative labor.

[0033] Figure 1 A structural schematic diagram of a solid-state transmitter device provided by the utility model is shown in the figure.

[0034] Figure 2 A gain power distribution schematic diagram provided by the utility model is shown in the figure.

[0035] Figure 3 A push-pull amplification module structural schematic diagram provided by the utility model is shown in the figure.

[0036] Figure 4 An eight-way waveguide power divider structural schematic diagram provided by the utility model is shown in the figure.

[0037] Figure 5 An in-phase and anti-phase power divider structural schematic diagram provided by the utility model is shown in the figure.

[0038] Figure 6 A power amplifier assembly structural schematic diagram provided by the utility model is shown in the figure.

[0039] Figure 7 A schematic diagram of an existing suspended microstrip structure is shown in Figure 1;

[0040] Figure 8 A schematic diagram of an existing E-plane T-junction power divider structure is shown in Figure 2;

[0041] Figure 9 A schematic diagram of an existing directional coupler simulation model is shown in Figure 3;

[0042] Figure 10 A schematic diagram of a power amplifier power supply assembly structure provided by the present application is shown in Figure 4;

[0043] Figure 11 A schematic diagram of a main path DC / DC module structure provided by the present application is shown in Figure 5;

[0044] Figure 12 A schematic diagram of an auxiliary path DC / DC module structure provided by the present application is shown in Figure 6.

[0045] The object, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0046] In order to make the object, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0047] Referring to Figure 1 The solid-state transmitter device provided by the embodiments of the present application comprises a push-pull assembly, a plurality of power amplifier assemblies and a waveguide synthesis network; wherein,

[0048] The push-pull assembly comprises an excitation signal input end, a first push-pull amplification link, a second push-pull amplification link and an input power division network; wherein, the excitation signal input end receives an excitation signal generated by a radar system and is electrically connected to the first push-pull amplification link and the second push-pull amplification link through two power dividers respectively;

[0049] The first push-pull amplification link comprises a delay and phase shift assembly, a first push-pull amplification module and a first four-way power divider which are electrically connected in sequence; the second push-pull amplification link comprises an adjustable attenuator, a second push-pull amplification module and a second four-way power divider which are electrically connected in sequence, and the input power division network is provided with 8 groups of power amplifier driving input ports corresponding to the first four-way power divider and the second four-way power divider and outputs power amplifier driving signals to the power amplifier assemblies;

[0050] The power amplifier assembly is set in one-to-one correspondence with the power amplifier drive input port, and respectively receives the corresponding output power amplifier drive signal; wherein the power amplifier assembly includes eight waveguide power dividers, corresponding two-stage amplification links and eight waveguide combiners, the input end of the waveguide power divider is electrically connected with the corresponding power amplifier drive input port;

[0051] The two-stage amplification link is provided with 8 groups and is electrically connected with the output end of the eight waveguide power divider respectively, the other end of the two-stage amplification link is electrically connected with the eight waveguide power divider respectively, the waveguide synthesis network is electrically connected with the output end of each eight waveguide power divider respectively, receives the power amplifier output signal of the 8 groups of power amplifier assemblies, and obtains the transmission output signal by waveguide synthesis.

[0052] It should be noted that: the solid-state transmitter device provided by the embodiment drives 8 power amplifier assemblies to work by the output power of one power amplifier assembly, and finally performs 8-way power synthesis; the high output power of the solid-state transmitter device is finally synthesized in a series and parallel manner by the multi-stage power amplifier assemblies, and the distributed working of each stage of the amplification assembly has a fault softening function; when a small number of components fail, only the output power slightly decreases, but the transmitter device can still work reliably; in addition, in the transmission power synthesis, the embodiment comprehensively considers factors such as synthesis efficiency, volume and weight, power capacity, reliability, wideband characteristics and the like, and different synthesis ways (planar power synthesis + magic T waveguide synthesis) are adopted on each stage of the power synthesis way.

[0053] In a specific embodiment, in order to meet the requirement of 16kW output power of the transmission system 16, the transmitter device uses a third-generation semiconductor device, a gallium nitride chip (GaN chip) with high power as a core microwave amplification chip, and the gallium nitride chip has the characteristics of high breakdown field strength, high cutoff frequency, wide band gap, high power, high thermal conductivity, high electron mobility and the like.

[0054] At present, the microwave amplification chip is basically an internal matching amplifier tube, that is, the manufacturer directly sinter the wafer in the tube shell, and the internal shunt and impedance matching have been completed; therefore, the embodiment first uses a 450W internal matching amplifier tube to form a two-stage amplification link, then uses 8 two-stage amplification links to form a 3kW power amplifier assembly, and finally 8 3kW power amplifier assemblies are synthesized to form a 20kW transmission system, and the output power of the transmission output signal is 16kW by reducing the drain voltage of the final stage.

[0055] The two-stage amplification link internally adopts a traditional planar power synthesis circuit, which has a simple structure, is easy to implement and is convenient for integration; when the 8 two-stage amplification links perform power synthesis, in consideration of the loss and volume, a non-isolated waveguide network is adopted for power synthesis; when the 8 power amplifier assemblies perform power synthesis, in consideration of the reliability, power capacity, synthesis efficiency and the like of the transmission system, a magic T synthesis with larger volume but with channel isolation is adopted.

[0056] The power supply design of the solid-state transmitter device is composed of a push power supply and four power amplifier power supplies. The push power supply is responsible for powering the communication circuit of the monitoring unit, the drive module and the power amplifier assembly. The power amplifier power supply is mainly used to power the power amplifier assembly. One power supply unit powers two power amplifier assemblies.

[0057] The solid-state transmitter device can change the envelope shape of the waveguide synthesis network output signal by adjusting the phase shifter phase shift angle inside the push assembly and replacing the microwave delay line specification when necessary, thereby affecting the transmission spectrum to meet the requirements of the relevant radio management bureau for the transmission signal.

[0058] In consideration of the design margin, the gain power distribution requirement is as shown in Figure 2

[0059] Push assembly

[0060] Input power: 5-10 dBm

[0061] Output power: ≥43 dBm.

[0062] Power amplifier assembly

[0063] Input power: 31-32 dBm

[0064] Two-way output power: ≥65.5 dBm

[0065] Magic T synthesis network

[0066] Insertion loss: ≤0.8 dB.

[0067] Among them, the power amplifier output reserves a margin of 0.4 dBm or more, and the output of the push assembly also has a margin of 1 dBm or more. This margin is mainly reserved for system high-temperature power drop. In the case of power surplus, the drain voltage is adjusted to reduce power and reduce heat consumption.

[0068] In order to more clearly illustrate the role and effect of the present application, the push assembly, power amplifier assembly and waveguide synthesis network are described in detail as follows:

[0069] Push assembly

[0070] ​The two-channel multi-stage amplification mode is adopted for design, the main function is to amplify the input signal and realize the power output of two paths of 43.3dBm, and simultaneously provide the running state parameters; when the excitation signal generated by the radar system is sent in, the isolator is sent in 2 paths of power division, one path of output is provided with a delay and phase shift component, the other path is provided with an adjustable attenuator to balance the insertion loss of the delay and phase shift component, and is respectively sent into the first push amplifier module and the second push amplifier module, two paths of about 20W signals are obtained, and then are respectively sent into two one-to-four power dividers to obtain eight paths of output signals for driving eight groups of power amplifier components.

[0071] Among them, the two paths of power dividers of the push amplifier component, the first four-path power divider and the second four-path power divider are all provided by the suspended microstrip power divider, because although the power dividing waveguide can bear more power and has smaller insertion loss, but it is heavier and larger in size. The suspended microstrip can completely bear the input power of this magnitude, and the deterioration of the insertion loss can be compensated by increasing the output power of the push amplifier component, and the advantages of size and weight are far greater than the power dividing waveguide. Considering the requirements of input power, insertion loss, size and weight, the suspended microstrip form is finally selected to realize it.

[0072] Note: the specific structure of the suspended microstrip is the existing structure, which is not limited here, we can use the structure as shown in Figure 7 to set up, or other existing structures can be used to set up.

[0073] The first push amplifier module and the second push amplifier module are provided by the same push amplifier module structure; wherein, the push amplifier module structure is as shown in Figure 3 , which comprises first amplification chip, attenuator chip, second amplification chip and MEMS isolator which are electrically connected in sequence; all the devices used are selected from chips with domestic independent property rights, which can fully guarantee the period and stability of supply, the first amplification chip is provided by NC1187C-506 chip, the attenuator chip is provided by NC1338C-120E chip, and the second amplification chip is provided by NC116133C-408P20 chip, the indexes of main components are marked in Figure 3 .

[0074] Power amplifier component

[0075] As shown in Figure 6As shown, the power amplifier assembly is composed of 8 parts, each of which adopts eight-way waveguide power divider, 8-way drive amplifier (push power tube), 8-way 450W power amplifier module (final stage power amplifier), eight-way waveguide combiner for signal splitting and combining, and finally outputs radio frequency pulse with power not less than 2.6kW. Among them, each module has an isolator at the end of the radio frequency link, which ensures that the final stage modules do not affect each other, so that the transmitter can still ensure normal power output under the condition that part of the final stage modules are damaged.

[0076] The radio frequency devices used in the final stage module are domestic devices with good quality and periodical self-controllability. The push power tube is NC316102S-507 type push single chip, and the small isolator is GT2756-2 in forward direction and GT2756-3 in reverse direction. The final stage power tube is NC43466S-506P355 type final stage power tube. The large isolator is GT2757-2 in forward direction and GT2757-3 in reverse direction. The indicators of the radio frequency components used in the final stage module are marked in Figure 6 .

[0077] In this embodiment, the waveguide power dividing / synthesizing network adopted by the eight-way waveguide power divider / combiner is based on the E-plane T-junction power divider structure, and the eight-way waveguide power divider / combiner we need is obtained by cascading on the basis of this structure. The power divider structure based on the E-plane T-junction is shown in Figure 8 . The insertion loss of the cascaded waveguide eight-way power dividing / synthesizing device obtained by actual processing based on the simulation structure of each stage is less than 0.6dB, which can meet the use requirements.

[0078] In addition, isolators and branch detection modules are arranged at the input and output stages of the power amplifier assembly. The isolators are used to ensure the stability and reliability of the amplification link. The power detection circuit is used for real-time monitoring of the working state of the device and provides necessary information data for the health management of the transmission system.

[0079] Waveguide combining network

[0080] The waveguide combining network is realized by using a magic T waveguide combining network. Compared with other transmission lines, the transmission medium of the waveguide is air, which has obvious advantages in low insertion loss and is very beneficial to the design of the power combiner. Since the uniformity of air medium is much higher than that of solid medium, the amplitude and phase consistency of the magic T waveguide combining network is also very obvious, and its performance in high frequency power combining application is much higher than that of other transmission lines.

[0081] Meanwhile, the dielectric constant of air is low, so the size of the waveguide network is larger, which is more conducive to the manufacture of high-power combiner at high operating frequency. The magic T waveguide synthesis network has isolation between channels. If there is a small imbalance between the paths, the magic T isolation end can absorb the mismatched power through the load, ensuring the final synthesis effect.

[0082] The main push assembly, power amplifier assembly and waveguide synthesis network have been described in detail above. The above content will be described in more detail.

[0083] The delay and phase shift assembly includes a delay module and a phase shift module. The delay module is mainly used for radio frequency signal delay, and is set using a fiber delay line. The delay time is set according to the actual situation. The phase shift module is a shelf product, and uses a hand adjustment mode. The adjustment position is determined according to the test situation during product debugging.

[0084] In order to realize the state monitoring of each stage of the transmitter device, we also set an input detection module, a plurality of branch detection modules and a whole machine detection module. Among them,

[0085] The input detection module, the branch detection module and the whole machine detection module all adopt the same detection module structure, including a directional coupler, a detection chip and an operational amplifier. The directional coupler includes a forward coupler and a reverse coupler and is electrically connected with the detection chip. The detection output end of the detection chip is electrically connected with the operational amplifier. The output end of the operational amplifier is electrically connected with the upper computer.

[0086] The input feed line is arranged on the excitation signal input end. The directional coupler is connected to the input feed line through the probe coupling mode by the input detection module. The branch feed line is arranged on the output end of the eight-way waveguide power divider. The directional coupler is connected to the branch feed line through the probe coupling mode by the branch detection module. The output feed line is arranged on the output end of the waveguide synthesis network. The directional coupler is connected to the output feed line through the probe coupling mode by the whole machine detection module.

[0087] The simulation model of the directional coupler using the probe coupling mode is shown in Figure 9 The directional coupler is a structure that exists, and only the specific use is described here, without limiting the specific directional coupler structure used in the actual application of the present application.

[0088] Since we set the branch detection module, we can realize the temperature alarm and power alarm function on the upper computer, so that when the transmitter has a problem, we can quickly locate the branch that has a problem in the power amplifier assembly, and improve the efficiency of system maintenance and replacement. Among them,

[0089] Temperature alarm is to place temperature sensor in the branch of higher temperature, and then the temperature sensor output ADC conversion, get temperature value. Temperature value in the host computer indicates and at the same time long radar monitoring, when a component temperature exceeds the design, the monitoring automatically cut off its enable signal.

[0090] Power alarm is through the probe coupling way, from the transmission main line coupling out signal, by the detector to detect voltage, and then the detection level by the operational amplifier amplification comparison processing, finally output high and low level, to determine whether the power amplifier component branch power is in fault state.

[0091] In addition, each feeder is provided with forward coupling signal for power and pulse width detection, and reverse coupling signal for spark and standing wave alarm detection; wherein, when the reverse coupling signal or the antenna feedback signal power exceeds the threshold, the transmitting system will be closed; the processing of the coupling signal uses the detection module after detection, and the output power data and the reflected power data are obtained by the host computer.

[0092] The difficulty in the structure of the detection module is the design of wideband detection. If a traditional Schottky diode is selected as the detector, the detection voltage difference between different frequency points is large, and the threshold setting can only be relatively wide, which will lead to the system cannot accurately judge the current state.

[0093] If DLVA detection component is used, the detection dynamic range is wide, the frequency range is wide, and the pulse response time is fast. However, it is large in size, high in cost, and inconvenient to integrate. There is also a detector chip which uses the working principle of DLVA detection component, but the detection level is less, and there is no temperature compensation circuit. The advantage is that the chip can be designed and integrated. The detection level is less, so the dynamic range is not wide, usually about 50dB, which meets the design requirements. Without temperature compensation, the system can be designed with different thresholds in different temperature ranges, which is a kind of compensation.

[0094] The core device of the component is the detection chip CB8317 produced by Changchun Semiconductor Factory, which can replace ADI AD8317 in situ. The specific parameters are shown in Table 1:

[0095] Table 1 Main parameters of detection chip

[0096] Parameter Test Condition / Description Minimum Typical Maximum Unit Operating Frequency 10 10000 MHz Maximum Input ± 1 dB deviation, frequency: 8 Ghz -2 dBm Minimum Input ± 1 dB deviation, frequency: 8 Ghz -46 dBm Output Voltage 1 Frequency: 8 Ghz, Power: -10 dBm 0.7 V Output Voltage 1 Frequency: 8 Ghz, Power: -40 dBm 1.39 V Detection Slope Frequency: 8 Ghz -22 mV / dB Detection Fall Time 90% to 10% 6 20 ns Detection Rise Time 10% to 90% 10 50 ns

[0097] The detection module detects the radio frequency sampling signal to obtain a voltage value, which is sent to the ADC sampling through the signal conditioning circuit, and is used for power detection and component health degree judgment.

[0098] The eight-way waveguide power divider adopts as Figure 4The shown topology is set, including the reverse power divider, the first in-phase power divider A, the first in-phase power divider B, the second in-phase power divider A1, the second in-phase power divider A2, the second in-phase power divider B1 and the second in-phase power divider B2; wherein, the in-phase power divider structure is shown in the left part of Figure 5 , the reverse power divider structure is shown in the right part of Figure 5 , the in-phase power divider and the reverse power divider are both set by the ring bridge, and are realized by different connection modes, and the radio frequency port of the ring bridge is set by SMA-K.

[0099] Note: Figure 5 The in-phase power divider structure and the reverse power divider structure are both existing structures, and are only used for specific description here, and the specific power divider structure used in actual application is not limited.

[0100] The push assembly is powered by a push power supply assembly, including a main DC / DC module and an auxiliary DC / DC module; wherein, the push power supply assembly works under the condition of 220VAC input, and its output includes three varieties of analog +12V, digital +8V and -5V, which can provide the direct current signals required for the normal operation of various functional modules in the push assembly and the transmitter device;

[0101] The main DC / DC module structure is shown in Figure 11 , which is composed of a DC / DC module and a phase-shifted full bridge, and the main DC / DC module adopts a phase-shifted full bridge circuit structure, the maximum output power can reach 1200W, the efficiency of a single DC / DC module can reach 93% at most, and an output filter circuit is additionally installed to effectively reduce the output ripple noise and meet the design requirements.

[0102] The auxiliary DC / DC module structure is shown in Figure 12 , which is composed of a PWM controller, a flyback drive chip and a variable inductor; wherein, a flyback circuit structure is adopted, the maximum output power is 12W, and the highest expected efficiency can reach 87%. The flyback drive chip (shelf product) has built-in output voltage and current acquisition circuit, and reports the single-chip microcomputer system of the whole machine through the internal control unit of the module, which can effectively improve the acquisition accuracy.

[0103] As shown in Figure 10 , the power amplifier assembly is powered by a power amplifier power supply assembly; wherein, the power amplifier power supply assembly is set by a drain modulation circuit with timing protection, including a MOS modulator, a MOS tube, a rising edge series resistor, a discharge series resistor, a decoupling capacitor and an energy storage capacitor; wherein, the energy storage capacitor has a capacity of 24500uF.

[0104] The power amplifier power supply assembly is divided into four identical groups, each of which is used to supply power to two power amplifier assemblies; the power amplifier power supply assembly works under 220VAC conditions, and its output includes +40V, +28V, and -5V, which can provide the DC signals required for the normal operation of various functional modules in the power amplifier assembly; the +40V and +28V output voltages of the assembly can be adjusted by sending commands through the serial port; in addition, the power amplifier assembly and the power supply assembly are both equipped with cooling fans; high-power axial flow fans are also installed on the cabinet for cooling, and the fan power is supplied separately to prevent noise pollution of the radio frequency spectrum.

[0105] In addition, the C-band 16KW all-solid-state transmitter works in pulse mode, and considering the overall power consumption of the device and the stability of the radio frequency circuit operating state, a MOS driver plus PMOS tube drain voltage modulation method is selected.

[0106] Since there are strict requirements for the power-on sequence of GaN power tubes, a modulation circuit with negative voltage protection is selected to ensure that the negative voltage is added first and the positive voltage is added later during the power-on process, and the negative voltage is turned off later than the positive voltage during the power-off process, so that the power tube will not be burned due to power-on timing errors.

[0107] Since the peak current of the final power tube is very high, a sufficient number of energy storage capacitors are required to meet the requirements of the transmitter for voltage drop. The calculation formula for the energy storage capacitors required by a single 2.6KW synthesis module is:

[0108]

[0109] Note: The above formula is calculated according to a voltage drop of 3V.

[0110] The above is only part of the embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the contents of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A solid state transmitter apparatus, characterized by, The push amplifier assembly comprises an excitation signal input end, a first push amplifier link, a second push amplifier link and an input power divider network. The excitation signal input end receives an excitation signal generated by a radar system and is electrically connected to the first push amplifier link and the second push amplifier link through two power dividers. The first push amplifier link comprises a delay and phase shift assembly, a first push amplifier module and a first four-way power divider connected in sequence. The second push amplifier link comprises an adjustable attenuator, a second push amplifier module and a second four-way power divider connected in sequence. The input power divider network is provided with eight groups of power amplifier drive input ports corresponding to the first four-way power divider and the second four-way power divider, and outputs power amplifier drive signals to the power amplifier assembly.

2. A solid state transmitter device according to claim 1, wherein, The power amplifier assembly is provided one-to-one corresponding to the power amplifier drive input ports and receives the corresponding output power amplifier drive signals.

3. A solid state transmitter device according to claim 1, wherein, The two-stage amplifier link is provided with eight groups and is electrically connected to the output end of the eight-way waveguide power divider.

4. A solid state transmitter device according to claim 3, wherein, The other end of the two-stage amplifier link is electrically connected to the eight-way waveguide power divider.

5. A solid state transmitter device as claimed in claim 1, wherein, The waveguide synthesis network is electrically connected to the output end of each eight-way waveguide power divider, receives the power amplifier output signals of the eight groups of power amplifier assemblies and synthesizes the transmission output signals.

6. A solid state transmitter device as claimed in claim 1, characterized in that The delay and phase shift assembly comprises a delay module and a phase shift module.

7. A solid state transmitter device as claimed in claim 1, wherein, The two-way power divider, the first four-way power divider and the second four-way power divider of the push amplifier assembly are provided by a suspended microstrip line power divider. The two-stage amplifier link comprises an input waveguide microstrip conversion module, a push power tube, a small isolator, a final power tube, a large isolator and an output waveguide microstrip conversion module connected in sequence. The first push amplifier module and the second push amplifier module are provided by the same push amplifier module structure. The waveguide synthesis network is provided by a magic T waveguide synthesis network. An input detection module, a plurality of branch detection modules and a whole machine detection module are further provided. The input detection module, the branch detection module and the whole machine detection module adopt the same detection module structure, comprising a directional coupler, a detection chip and an operational amplifier. The directional coupler comprises a forward coupler and a reverse coupler and is electrically connected to the detection chip. The detection output end of the detection chip is electrically connected to the operational amplifier. The output end of the operational amplifier is electrically connected to the host computer. The input terminal of the excitation signal is provided with an input feed line, and the input detection module is connected to the input feed line through a directional coupler in a probe coupling manner; the output terminal of the eight-way waveguide power divider is provided with a branch feed line, and the branch detection module is connected to the branch feed line through a directional coupler in a probe coupling manner; the output terminal of the waveguide synthesis network is provided with an output feed line, and the whole machine detection module is connected to the output feed line through a directional coupler in a probe coupling manner.

8. A solid state transmitter device as claimed in claim 1, wherein, The eight-way waveguide power divider comprises an inverting power divider, a first same-phase power divider A, a first same-phase power divider B, a second same-phase power divider A1, a second same-phase power divider A2, a second same-phase power divider B1 and a second same-phase power divider B2; wherein the inverting power divider is electrically connected with the first same-phase power divider A and the first same-phase power divider B respectively, the first same-phase power divider A is electrically connected with the second same-phase power divider A1 and the second same-phase power divider A2 respectively, and the first same-phase power divider B is electrically connected with the second same-phase power divider B1 and the second same-phase power divider B2 respectively.

9. The solid state transmitter apparatus of claim 1, wherein, The push-pull assembly is powered by a push-pull power supply assembly, which comprises a main DC / DC module and an auxiliary DC / DC module; wherein the main DC / DC module is composed of a DC / DC module and a phase-shifted full bridge, and the auxiliary DC / DC module is composed of a PWM controller, a flyback drive chip and a variable inductor.

10. The solid state transmitter apparatus of claim 1, wherein, The power amplifier assembly is powered by a power amplifier power supply assembly; wherein the power amplifier power supply assembly is set by a drain modulation circuit with timing protection, including a MOS modulator, a MOS tube, a rising edge series resistor, a discharge series resistor, a decoupling capacitor and an energy storage capacitor; wherein the energy storage capacitor has a capacitance value of 24500uF.

Images