Pulse type load power supply circuit

Abstract

The utility model discloses a pulse type load power supply circuit which comprises an input filter circuit, a high-energy tantalum capacitor charging and discharging and protection circuit and an output voltage stabilizing circuit. The input end of the input filter circuit is connected with an external input power supply, the output end of the input filter circuit is connected with the input end of the high-energy tantalum capacitor charging and discharging and protection circuit, and the output end of the high-energy tantalum capacitor charging and discharging and protection circuit is connected with the output voltage stabilizing circuit. The output voltage stabilizing circuit is also connected with an external pulse type load so as to realize power supply; the beneficial effects are that interference of a pulse type load on an input power supply and product size are reduced, and stability of the input power supply is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply circuits, in particular to a pulse type load power supply circuit. Background Art

[0002] Pulse load is a common type of nonlinear load. It not only has the characteristics of short-term high load, but also has a certain periodicity. For example, radar, broadcasting system and various communication equipment are all pulse loads.

[0003] At present, the working modes of phased array radars are diversified, and the load characteristics are manifested as low duty cycle pulse loads. There are fixed times and peak powers in the receiving, transmitting and standby stages. The specific load characteristics are as follows: Figure 1 As shown. Pf is the transmit power, the transmit time is t1, Ps is the receive power, the receive time is t2, and Pd is the standby power, the standby time is t3. This load characteristic has high requirements on power supply performance and may cause a series of stability problems. Using traditional DC-DC isolated power supply to directly power the phased array radar load has the following problems:

[0004] First, the power supply must be selected according to the maximum transmission power Pf, otherwise it may cause input voltage drop or fluctuation, which will increase the volume and cost.

[0005] Second, the output pulse load current leads to rich input high-order harmonics, which generates large interference noise to the input power supply;

[0006] Third, the dynamic load characteristics of the DC-DC isolated power supply are required to be high. For example, if the loop response speed is slow, it will cause fluctuations in the output voltage and affect the system operation. Utility Model Content

[0007] In view of the defects in the prior art, the utility model provides a pulse type load power supply circuit to improve the stability of the input power supply.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0009] A pulse type load power supply circuit, comprising an input filter circuit, a high energy tantalum capacitor charging and discharging and protection circuit and an output voltage stabilizing circuit;

[0010] The input end of the input filter circuit is connected to an external input power supply, the output end of the input filter circuit is connected to the input end of the high-energy tantalum capacitor charging, discharging and protection circuit, the output end of the high-energy tantalum capacitor charging, discharging and protection circuit is connected to the output voltage stabilizing circuit, and the output voltage stabilizing circuit is also connected to an external pulse load to realize power supply.

[0011] Preferably, the input filter circuit comprises an input EMC filter circuit for processing interference and a surge current suppression circuit for preventing a large surge current from being generated at the moment of startup of a subsequent circuit.

[0012] Preferably, the high-energy tantalum capacitor charging, discharging and protection circuit includes a DC-DC isolated charging circuit and a high-energy tantalum capacitor, the surge current suppression circuit is connected to the DC-DC isolated charging circuit, and the output end of the DC-DC isolated charging circuit is connected to the high-energy tantalum capacitor.

[0013] Preferably, the charging mode of the DC-DC isolation charging circuit adopts a constant power current limiting charging mode.

[0014] Preferably, the output voltage stabilization circuit includes a non-isolated buck-boost voltage stabilization circuit and an output filter circuit; the input end of the non-isolated buck-boost voltage stabilization circuit is connected to the high-energy tantalum capacitor, the output end of the non-isolated buck-boost voltage stabilization circuit is connected to the input end of the output filter circuit, and the output end of the output filter circuit is connected to an external pulse-type load.

[0015] Preferably, the pulse load is a phased array radar load.

[0016] Preferably, the input voltage of the input power supply is 28V standard power supply.

[0017] The beneficial effects of the utility model are embodied in: through the input filter circuit, the rear-stage circuit is prevented from causing greater interference to the front-stage input power supply; the surge current suppression circuit can prevent the rear-stage circuit from generating a large surge current at the moment of startup, causing the voltage drop or protection of the front-stage power supply;

[0018] By using high-energy tantalum capacitors and non-isolated voltage-stabilizing circuits to power pulse loads, the power of the input power supply is greatly reduced, the stability of the input power supply is improved, and the requirements of the power supply circuit for dynamic loads are reduced; at the same time, using high-energy tantalum capacitors as energy storage components can reduce the volume of the product while maintaining stable high and low temperature performance, making it suitable for occasions with frequent charging and discharging;

[0019] A non-isolated buck-boost voltage regulator circuit is used to power the subsequent pulse load. This topology can ensure high efficiency and good stability within a wide input range. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0021] Figure 1 A power schematic diagram of a load characteristic provided by an embodiment of the utility model;

[0022] Figure 2 A circuit schematic diagram of a pulse load power supply circuit provided by an embodiment of the utility model;

[0023] Figure 3 A schematic diagram of the change of the voltage Ut of a high-energy tantalum capacitor in three modes provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0024] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0025] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0026] like Figure 2 As shown, the utility model provides a pulse type load power supply circuit, including an input filter circuit, a high energy tantalum capacitor charging and discharging and protection circuit and an output voltage stabilizing circuit;

[0027] The input end of the input filter circuit is connected to an external input power supply, the output end of the input filter circuit is connected to the input end of the high-energy tantalum capacitor charging, discharging and protection circuit, the output end of the high-energy tantalum capacitor charging, discharging and protection circuit is connected to the output voltage stabilizing circuit, and the output voltage stabilizing circuit is also connected to an external pulse load to realize power supply.

[0028] In this embodiment, the pulse load is described by taking a phased array radar load as an example; the input voltage of the input power supply is a 28V standard power supply.

[0029] The input filter circuit includes an input EMC filter circuit for processing interference and an inrush current suppression circuit for preventing a large inrush current from being generated at the moment of startup of the subsequent circuit, thereby preventing the subsequent circuit from causing a large interference to the previous input power supply; at the same time, the inrush current suppression circuit prevents a large inrush current from being generated at the moment of startup of the subsequent circuit, causing a voltage drop or protection of the previous power supply.

[0030] Furthermore, the high-energy tantalum capacitor charging, discharging and protection circuit includes a DC-DC isolated charging circuit and a high-energy tantalum capacitor, the surge current suppression circuit is connected to the DC-DC isolated charging circuit, and the output end of the DC-DC isolated charging circuit is connected to the high-energy tantalum capacitor; wherein the charging mode of the DC-DC isolated charging circuit adopts a constant power current limiting charging mode.

[0031] Specifically, in order to ensure that the tantalum capacitor has enough energy during the discharge time, the voltage of the tantalum capacitor after it is fully charged should be selected to be the highest voltage within the derating range. If a 100V high-energy tantalum capacitor is selected, the maximum charging voltage can be set to 50V. In the three operating modes of the phased array radar, during the receiving and transmitting stages, the charging circuit charges the tantalum capacitor while the tantalum capacitor supplies power to the subsequent circuit through discharge; in the lower-power standby stage, the charging circuit both charges the tantalum capacitor and supplies power to the subsequent circuit. The changes in the voltage Ut of the high-energy tantalum capacitor in the three modes are as follows: Figure 3 shown.

[0032] Assuming the charging power is Pc, the capacity of the high-energy tantalum capacitor is C, and the efficiency of the post-stage non-isolated DC-DC circuit is η, according to the law of conservation of energy, the relationship between the parameters in the emission stage is as follows:

[0033]

[0034] Due to the large transmission power, the voltage drop rate is faster in the transmitter stage, and the drop rate is slower in the receiving stage. The relationship between the parameters in the receiving stage is as follows:

[0035]

[0036] The standby stage is the charging stage, and the voltage rises linearly. The relationship between the parameters in the standby stage is as follows:

[0037]

[0038] Therefore, in order to ensure sufficient discharge energy, the charging circuit should charge the tantalum capacitor to the maximum voltage U3 during the standby phase. The charging mode of the DC-DC isolation charging circuit is constant power current limiting charging, that is, the tantalum capacitor limits the maximum charging current during the low voltage charging phase and limits the maximum power during the high voltage charging phase. Compared with constant current charging, this charging mode has a shorter charging time. At the same time, the limitation of the maximum charging current can fully guarantee the working life of the capacitor. High-energy tantalum capacitors are small in size, large in capacity, good in sealing, and stable in high and low temperature performance, making them suitable for occasions of frequent charging and discharging.

[0039] Furthermore, the output voltage stabilization circuit includes a non-isolated buck-boost voltage stabilization circuit and an output filter circuit; the input end of the non-isolated buck-boost voltage stabilization circuit is connected to the high-energy tantalum capacitor, the output end of the non-isolated buck-boost voltage stabilization circuit is connected to the input end of the output filter circuit, and the output end of the output filter circuit is connected to an external pulse-type load.

[0040] Specifically, refer to Figure 3 It can be seen that the power supply range of the output voltage regulator circuit is U1~U3. Due to the large voltage fluctuation range, a non-isolated buck-boost voltage regulator circuit is selected to power the subsequent phased array load. This topology can ensure high efficiency, good stability and small size within a wide input range.

[0041] When the phased array radar load is working, this technical solution uses the standby stage to charge the tantalum capacitor, and in the receiving and transmitting stages, the front-stage charging power supply and the tantalum capacitor jointly power the rear-stage non-isolated circuit; therefore, the power of the charging power supply is less than the transmitting and receiving power, and the specific power selection can be obtained according to the above formula. Because the pulse discharge current is shared by the charging power supply and the high-energy tantalum capacitor, the input current fluctuation of the charging power supply is small, and the interference to the input end is reduced.

[0042] It should be noted that the present technical solution is also applicable to other types of pulse load power supply systems with fixed frequency, duty cycle and peak power.

[0043] The utility model uses an input filter circuit to prevent the subsequent circuit from causing significant interference to the previous input power supply; the surge current suppression circuit can prevent the subsequent circuit from generating a large surge current at the moment of startup, causing the voltage drop or protection of the previous power supply;

[0044] By using high-energy tantalum capacitors and non-isolated voltage-stabilizing circuits to power pulse loads, the power of the input power supply is greatly reduced, the stability of the input power supply is improved, and the requirements of the power supply circuit for dynamic loads are reduced; at the same time, using high-energy tantalum capacitors as energy storage components can reduce the volume of the product while maintaining stable high and low temperature performance, making it suitable for occasions with frequent charging and discharging;

[0045] A non-isolated buck-boost voltage regulator circuit is used to power the subsequent pulse load. This topology can ensure high efficiency and good stability within a wide input range.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A pulse load power supply circuit, Features , including input filter circuit, high energy tantalum capacitor charging and discharging and protection circuit and output voltage stabilization circuit; The input end of the input filter circuit is connected to an external input power supply, the output end of the input filter circuit is connected to the input end of the high-energy tantalum capacitor charging, discharging and protection circuit, the output end of the high-energy tantalum capacitor charging, discharging and protection circuit is connected to the output voltage stabilizing circuit, and the output voltage stabilizing circuit is also connected to an external pulse load to realize power supply.

2. A pulse type load power supply circuit according to claim 1, Features The input filter circuit includes an input EMC filter circuit for processing interference and a surge current suppression circuit for preventing a large surge current from being generated at the moment of startup of the subsequent circuit.

3. A pulse type load power supply circuit according to claim 2, Features The high-energy tantalum capacitor charging, discharging and protection circuit includes a DC-DC isolation charging circuit and a high-energy tantalum capacitor. The surge current suppression circuit is connected to the DC-DC isolation charging circuit, and the output end of the DC-DC isolation charging circuit is connected to the high-energy tantalum capacitor.

4. A pulse type load power supply circuit according to claim 3, Features The charging mode of the DC-DC isolation charging circuit adopts a constant power current limiting charging mode.

5. A pulse type load power supply circuit according to claim 3, Features The output voltage stabilization circuit includes a non-isolated buck-boost voltage stabilization circuit and an output filter circuit; the input end of the non-isolated buck-boost voltage stabilization circuit is connected to the high-energy tantalum capacitor, the output end of the non-isolated buck-boost voltage stabilization circuit is connected to the input end of the output filter circuit, and the output end of the output filter circuit is connected to an external pulse load.

6. A pulse type load power supply circuit according to any one of claims 1 to 5, Features ,The pulse type load is a phased array radar load.

7. A pulse type load power supply circuit according to claim 6, Features , the input voltage of the input power supply is 28V standard power supply.

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