Power supply unit with micro-pulse wave absorption function

Abstract

The invention discloses a power device with a micropulse wave absorption function. The power device comprises a rectification and filter module, a first micropulse wave discharge module, at least one micropulse wave insulation module, at least one second filter module and a second micropulse wave discharge module. The rectification and filter module comprises a rectifier bridge and a first filter capacitor. The first micropulse wave discharge module is arranged at the output end of the rectifier bridge and used for discharging micropulse waves generated by the first filter capacitor. The micropulse wave insulation modules are sequentially arranged at the output end of the rectifier bridge and used for insulating out negative micropulse waves generated by a pin inductor of the first filter capacitor, and each second filter module comprises a second filter capacitor. The second micropulse wave discharge module is arranged at the output end of the power device and used for carrying out secondary discharging on residual micropulse waves passing through the at least one micropulse wave insulation module and micropulse waves generated by the second filter capacitors. According to the power device, micropulse waves with time intervals shorter than a nanosecond section and a microsecond section can be absorbed, the transient performance and EMC performance of a power source in a high-frequency circuit system are effectively improved.

Description

technical field [0001] The invention relates to the technical field of signal transmission, in particular to a power supply device with a micro-pulse wave absorption function. Background technique [0002] In a common AC-DC power supply circuit, due to the additional parameters such as inductance, high-frequency skin resistance, and DC resistance at the pin of the filter capacitor, when the load current changes suddenly, or the source current changes suddenly when driving an inductive load, A pulse wave will appear in the voltage across the filter capacitor. Due to various reasons such as conductor skin effect, conductor surface defects, absorbing device speed, etc., the pulse wave cannot be absorbed by various conventional devices including line-to-line capacitance in the very short time (such as picosecond and femtosecond intervals) when it first occurs. The device absorbs well, which is a typical EMI (ElectroMagnetic Interference, electromagnetic interference) problem th...

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Problems solved by technology

[0003] The spectrum analysis method based on Fourier transform is easy to ignore this kind of pulse wave which may not appear frequently but has extremely high-frequency properties locally, because it is difficult for traditional instruments to capture it in nanoseconds and picoseconds. area, so the usual power supply ripple evaluation system does not consider its existence in this area at all.

In fact, the ability of the conventional circuit to suppress the AC ripple of the power supply gradually decreases with the increase of the frequency, so it is necessary to pay enough attention to its harm.

[0004] At present, in the field of high-frequency circuits and audio which are extremely sensitive to such pulse waves, the understanding and treatment of this problem is even more blank.

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