Power supply unit with high power density and low noise

Abstract

The invention discloses a power supply unit with high power density and low noise, comprising a power input terminal and a power output terminal which are connected through a positive line and a negative line, wherein a protection circuit, an input noise suppression part, a power conversion part and a power output part are arranged between the power input terminal and the power output terminal in sequence; a shielding heat radiator in the power supply unit is used for shielding the noise generated by a power conversion module and realizes the good heat radiating capability; and a positive line output connector for the power supply unit reduces the common mode noise generated due to the connection between the power output of the power supply unit and the load. A plurality of noise suppression methods can suppress the noise round and round and the power supply unit has the advantages of wide input range, high power density, high conversion efficiency, high current, low output noise, small volume and light weight.

Description

technical field [0001] The invention relates to the field of microwave electrotechnical technology, in particular to a power supply component with high power density and low noise. Background technique [0002] The solid-state power amplifier chips used in microwave solid-state power amplifier components have low DC-to-RF conversion efficiency and low drain voltage. Therefore, the power supply components need to provide a large current to meet the high power requirements of microwave solid-state power amplifier components. Microwave solid-state power amplifier components are often used in missiles, radars and other occasions where volume and weight are strictly required, and the volume and weight requirements for power supply components are also very stringent. A key factor for the stability of low-frequency self-excitation and output RF power of microwave solid-state power amplifier components is the noise of power supply components, so the output noise of power supply comp...

AI Technical Summary

Problems solved by technology

[0003] The power supply components traditionally used in microwave solid-state power amplifier products are designed with brick power modules. Board volume, the designed power supply components are relatively large

The output power filter of the power supply unit uses a large-capacity tantalum capacitor as the filter capacitor. Due to its high parasitic resistance value, it cannot eliminate ripples well, and the tantalum capacitor has poor mechanical properties such as shock resistance, and generally cannot meet high-mobility applications. occasion

The noise generated by the switching frequency of the brick power module of the power supply is generally suppressed by the shielding case of high-conductivity material, but the high-conductivity material has a general shielding effect on electromagnetic noise, and cannot meet the noise requirements of microwave solid-state power amplifier components.

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