Power adapter with high-conversion-rate low-loss rectifying and filtering circuit

Abstract

The invention discloses a power adapter with a high-conversion-rate low-loss rectifying and filtering circuit. The power adapter comprises a main circuit, wherein one side of the main circuit is provided with a mains supply end connected to a mains supply, the other side of the main circuit is provided with a user end connected with a user load, and the main circuit is provided with a series resonance structure with adjustable resonance frequency. According to the invention, the series resonance structure with the adjustable resonance frequency is a series resonance circuit with an adjustablecapacitor or an adjustable inductor, and in the series resonance, the numerical value of the capacitor or the inductor is adjusted to enable the impedance of the capacitor or the inductor to be extremely small under a specific frequency, so that the harmonic current passes through the series resonance circuit completely, equivalently a short-circuit channel is provided for the harmonic current, the harmonic current does not pass through a user load end, and the filtering purpose is achieved; and through a mode of adjusting the resonant frequency, the maximum harmonic component on the commercial power grid end is filtered, and the power utilization quality on the user end is effectively ensured.

Description

Technical field [0001] The invention relates to the field of power adapters, in particular to a power adapter with a high conversion rate and low loss rectifier filter circuit. Background technique [0002] The power adapter is a widely used electrical component, which adjusts the voltage of the city network terminal to a suitable voltage to load on the load, and at the same time plays a role of stabilizing the current. [0003] More and more power adapters are beginning to join the filter structure. With more and more control devices and power factor adjustment devices on the city network circuit, there are more and more harmonic currents on the city grid, which has become a kind of grid pollution. These harmonic currents enter the user's load, which not only cannot be used, but also harms the device. Therefore, the harmonic current on the municipal network side should be isolated from the user's load. [0004] In the prior art, the resonant circuit is commonly used for filtering. ...

AI Technical Summary

Problems solved by technology

[0003] More and more power adapters are beginning to add filter structures. With more and more control devices and power factor adjustment devices on the city network circuit, the harmonic current on the city network is increasing, which has become a kind of grid pollution. These harmonic currents enter the user load, not only cannot be used, but also cause harm to the device, so the harmonic current on the mains terminal should be isolated from the user load

[0004] In the prior art, the resonant circuit is commonly used for filtering, but the commonly used circuit uses to filter the harmonics of a specific frequency, but cannot produce effects on the harmonics of other orders. Through circuit design, such as double-harmonic filter circuit, The harmonics of two orders can be filtered, however, it is still not enough for use. In general high-precision occasions, the estimated two harmonics of the order of the maximum effective value are selected for the design of the double harmonic filter circuit. The applicability is There are two stages

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