A dual DC bus power supply method for phased array radar array

Abstract

The application discloses a kind of dual DC bus power supply methods for phased array radar array in power supply field, high-voltage DC bus is converted into low-voltage DC by first stage DC / DC unit and is output to low-voltage DC bus with high-voltage DC, and low-voltage DC bus is powered to each terminal load by second stage DC / DC unit corresponding;Each terminal load feeds back the sampling data of itself to the total control unit, the actual load efficiency of each terminal load under current voltage is calculated, and whether the actual load efficiency is consistent with the highest load efficiency of terminal load corresponding to current voltage is judged, the result is fed back to first stage DC / DC unit and the output voltage of low-voltage DC bus is adjusted.The application realizes that electric energy is transmitted by high-voltage DC long distance, terminal load is distributedly powered by low-voltage DC bus, and the voltage on low-voltage DC bus is controlled by total control unit receiving feedback signal, so that the overall efficiency of terminal load is highest or the efficiency of terminal load with priority is highest.

Description

Technical Field

[0001] This invention relates to the field of power supply, specifically a dual DC bus power supply method for phased array radar arrays. Background Technology

[0002] Currently, most domestic power supply systems for phased array radar arrays have complex architectures, numerous conversion stages, and low overall system conversion efficiency, specifically manifested in the following aspects:

[0003] High-voltage direct current (DC) is conducted from a distance to the vicinity of the load terminal, where it is converted into low-voltage DC. Based on the voltage requirements of each terminal load, the low-voltage DC is then converted into different output voltages, such as 12V or 36V, for the terminal load. The existing power supply system is an open-loop system, with a constant low-voltage DC output and a constant load efficiency for the terminal loads. It cannot be adjusted to allow the terminal loads to operate at their highest efficiency. The entire power supply system is rigid, complex, and lacks flexibility, failing to adapt the low-voltage DC output to the number, type, and importance of the terminal loads. This limits the potential for future upgrades and expansions. Especially when the terminal loads are located in remote areas with extremely high power consumption, the high-voltage DC supply voltage cannot be further increased, making it essential to adjust the output voltage to improve the load efficiency of the terminal loads. Summary of the Invention

[0004] The purpose of this invention is to provide a dual DC bus power supply method for phased array radar arrays to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A dual DC bus power supply method for phased array radar arrays includes a high-voltage DC bus, a low-voltage DC bus, and a central control unit. The high-voltage DC bus converts high-voltage DC to low-voltage DC through a first-stage DC / DC unit and outputs it to the low-voltage DC bus. The low-voltage DC bus supplies power to each terminal load through a second-stage DC / DC unit. Each terminal load feeds back its sampled data to the central control unit. The central control unit calculates the actual load efficiency of each terminal load under the current voltage based on the sampled data and determines whether the actual load efficiency is consistent with the highest load efficiency of the terminal load corresponding to the current voltage. The central control unit feeds back the determination result to the first-stage DC / DC unit. The first-stage DC / DC unit adjusts the output voltage of the low-voltage DC bus according to a predetermined adjustment strategy to achieve closed-loop control.

[0007] As an improvement of the present invention, when the judgment result of the main control unit is consistent, the adjustment strategy is configured to keep the original output voltage of the low-voltage DC bus unchanged, so that each terminal load can maintain operation at the highest load efficiency.

[0008] As an improvement of the present invention, when the judgment result of the central control unit is inconsistent, the adjustment strategy is configured such that the central control unit adjusts the output voltage of the low-voltage DC bus until the terminal load with the highest priority operates at the highest load efficiency, or, according to the weight ratio of each terminal load, the central control unit adjusts the output voltage of the low-voltage DC bus until the overall efficiency of all terminal loads is the highest.

[0009] As an improvement of the present invention, the output voltage of the low-voltage DC bus corresponds to the highest load efficiency when the terminal load is running by a lookup table method.

[0010] As an improvement of the present invention, the sampling data includes the power of the terminal load and the operating temperature, and the sampling data is fed back to the central control unit after being filtered by a second-order low-pass digital filter.

[0011] As an improvement of the present invention, the voltage of the high-voltage DC bus is any value within the range of 80%-120% of 270V, 380V, 500V, or 750V.

[0012] As an improvement of the present invention, the voltage of the low-voltage DC bus is any value within the range of 80%-120% of 12V, 28V, 36V, or 48V.

[0013] As an improvement of the present invention, the AC input is converted into DC output to the high-voltage DC bus by the AC / DC unit. The AC input includes the power grid and the diesel generator. The power grid and the diesel generator are connected to the AC / DC unit through the power distribution unit.

[0014] As an improvement of the present invention, the high-voltage DC bus is connected to the battery through a bidirectional DC / DC unit.

[0015] Beneficial effects: This invention realizes the long-distance transmission of electrical energy from high voltage DC, the distributed power supply of terminal loads via low voltage DC bus, and the control unit receiving feedback signals to control the voltage on the low voltage DC bus, so that the overall efficiency of the terminal loads is the highest or the efficiency of the terminal loads with priority is the highest. Attached Figure Description

[0016] Figure 1 This is a block diagram of the power supply system of the present invention;

[0017] Figure 2 This is a schematic diagram of the closed-loop regulation principle of the power supply system of the present invention;

[0018] Figure 3 This is a diagram illustrating the implementation steps of the power supply system of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] A dual DC bus power supply method for phased array radar arrays includes a high-voltage DC bus HV_BUS, a low-voltage DC bus LV_BUS, and a central control unit. The high-voltage DC bus HV_BUS is powered individually or in combination via AC input and DC input. Specifically, the AC input is converted to DC output to the high-voltage DC bus HV_BUS via an AC / DC unit. The AC input includes a public power grid and a diesel generator, which are connected to the AC / DC unit via a power distribution unit. The DC input includes a battery, which serves as a backup emergency power supply and is connected to the high-voltage DC bus via a bidirectional DC / DC unit. The bidirectional DC / DC unit is a switching power supply capable of bidirectional power transmission, enabling both the battery to supply power to the high-voltage DC bus and the high-voltage DC bus to charge the battery.

[0021] This application can also be used to power transceiver components in data centers and phased-array radar arrays, such as... Figure 1 As shown, the power supply system of the transceiver component of a phased radar array is used as an example for illustration.

[0022] In this embodiment, the phased array radar array is composed of a large number of transceiver components. Each transceiver component mainly consists of a second-stage DC / DC unit and terminal loads such as CNC boards, frequency sources, mixers, T / R, etc. Each terminal load requires a stable DC power supply. Since the required voltage is different, each terminal load is connected to a second-stage DC / DC unit.

[0023] like Figures 2-3 As shown, after the power distribution unit distributes power, the high-voltage direct current (HVDC) is transmitted over long distances to reduce transmission losses. Near the terminal loads, the HVDC bus converts the HVDC to low-voltage DC through the first-stage DC / DC unit and outputs it to the low-voltage DC bus LV_BUS. The low-voltage DC bus LV_BUS is further regulated by the second-stage DC / DC unit before supplying power to each terminal load. Generally, there are about four or five terminal loads.

[0024] Each terminal load feeds back its sampled data to the central control unit. The central control unit calculates the actual load efficiency of each terminal load under the current voltage based on the sampled data. Since the load efficiency of terminal loads varies under different voltages (power), the central control unit can use a lookup table to find the highest load efficiency point for each terminal load under the current voltage. Using this point as the closed-loop point, it determines whether the actual load efficiency matches the highest load efficiency point. The central control unit feeds back the determination result to the first-stage DC / DC unit, which then adjusts the output voltage of the low-voltage DC bus according to a predetermined adjustment strategy.

[0025] It should be noted that the sampled data includes the power of the terminal load, the operating temperature, and may also include parameters such as output voltage and output current. To reduce the impact of high-frequency interference signals in the second-stage DC / DC unit on the sampled data and achieve better filtering, the temperature and power sampled data are filtered using a second-order low-pass digital filter, the transfer function of which is as follows:

[0026]

[0027] In the formula, ζ is the damping ratio, which is a two-pole transfer function. To facilitate digital calculation, it needs to be discretized. This design uses a bilinear transform:

[0028]

[0029] The discrete-domain expression for the second-order filter transfer function is:

[0030]

[0031] Digital filtering can be performed using the above discrete-domain equations. In this embodiment, the damping ratio ζ is taken as 0.707, w c = 3140 rad / s, sampling period is T S =0.1ms.

[0032] When it is determined that the actual load efficiency of each terminal load is the highest load efficiency obtained from the table, the main control unit feeds back to the first-level DC / DC unit. At this time, the adjustment strategy is to keep the original output voltage of the low-voltage DC bus unchanged, so that each terminal load can maintain operation at the highest load efficiency. At this time, the entire power supply system is also in the state of highest operating efficiency.

[0033] When the judgment results are inconsistent, there are two adjustment strategies. The first is to take into account the operation of each terminal load. In this case, the highest load efficiency value corresponding to the current voltage for each terminal load is found by looking up a table. Since there is only one low-voltage DC bus, the main control unit feeds back to the first-level DC / DC unit according to the weight ratio of each terminal load (the proportion of branch load to the total system load). The first-level DC / DC unit adjusts the output voltage of the low-voltage output bus to maximize the overall operating efficiency of the power supply system.

[0034] The second method is to prioritize the terminal loads. The priority of the terminal loads can be preset manually. For example, the loads that are most sensitive to temperature can be given the highest priority. By finding the highest load efficiency value corresponding to the highest priority terminal load under the current voltage, the output voltage of the low-voltage output bus is adjusted so that the highest priority terminal load operates at the highest load efficiency.

[0035] In this embodiment, the voltage of the high-voltage DC bus is any value within the range of 80%-120% of 270V, 380V, 500V, or 750V, and the voltage of the low-voltage DC bus is any value within the range of 80%-120% of 12V, 28V, 36V, or 48V. For example, if the initial output voltage of the low-voltage DC bus is 12V, but the main control unit calculates that the overall efficiency of the power supply system is highest when the output voltage is 10V, then the main control unit can feed back to the first-stage DC / DC unit to adjust the output voltage of the low-voltage DC bus to 10V.

[0036] This invention enables long-distance transmission of electrical energy via high-voltage DC, distributed power supply of terminal loads via low-voltage DC bus, and control of the voltage on the low-voltage DC bus by the central control unit receiving feedback signals, thereby maximizing the overall efficiency of the terminal loads or maximizing the efficiency of priority terminal loads.

[0037] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0038] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A dual DC bus power supply method for phased array radar arrays, comprising a high-voltage DC bus, a low-voltage DC bus, and a main control unit; the high-voltage DC bus converts high-voltage DC to low-voltage DC through a first-stage DC / DC unit and outputs it to the low-voltage DC bus, and the low-voltage DC bus supplies power to each terminal load through a second-stage DC / DC unit; characterized in that: Each terminal load feeds back its sampled data to the central control unit. The central control unit calculates the actual load efficiency of each terminal load under the current voltage based on the sampled data and determines whether the actual load efficiency is consistent with the highest load efficiency of the terminal load corresponding to the current voltage. The central control unit feeds back the determination result to the first-stage DC / DC unit. The first-stage DC / DC unit adjusts the output voltage of the low-voltage DC bus according to a predetermined adjustment strategy to achieve closed-loop control. When the central control unit determines that the results are inconsistent, the adjustment strategy is configured to either adjust the output voltage of the low-voltage DC bus until the terminal load with the highest priority operates at the highest load efficiency, or adjust the output voltage of the low-voltage DC bus according to the weight ratio of each terminal load until the overall efficiency of all terminal loads is maximized.

2. The dual DC bus power supply method for a phased array radar array according to claim 1, characterized in that, When the judgment result of the main control unit is consistent, the adjustment strategy is configured to keep the original output voltage of the low-voltage DC bus unchanged and keep each terminal load operating at the highest load efficiency.

3. The dual DC bus power supply method for a phased array radar array according to claim 1, characterized in that, The output voltage of the low-voltage DC bus corresponds to the highest load efficiency of the terminal load during operation using a lookup table.

4. The dual DC bus power supply method for a phased array radar array according to claim 1, characterized in that, The sampled data includes the power of the terminal load and the operating temperature. The sampled data is filtered by a second-order low-pass digital filter and then fed back to the central control unit.

5. A dual DC bus power supply method for a phased array radar array according to claim 1, characterized in that, The voltage of the high-voltage DC bus can be any value within the range of 80%-120% of 270V, 380V, 500V, or 750V.

6. The dual DC bus power supply method for a phased array radar array according to claim 1, characterized in that, The voltage of the low-voltage DC bus can be any value within the range of 80%-120% of 12V, 28V, 36V, or 48V.

7. A dual DC bus power supply method for a phased array radar array according to claim 1, characterized in that, The AC input is converted into DC output to the high-voltage DC bus by the AC / DC unit. The AC input includes the power grid and the diesel generator. The power grid and the diesel generator are connected to the AC / DC unit through the power distribution unit.

8. A dual DC bus power supply method for a phased array radar array according to claim 1, characterized in that, The high-voltage DC bus is connected to the battery via a bidirectional DC / DC unit.

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