Low-frequency ripple suppression circuit

Abstract

The embodiment of the invention provides a low-frequency ripple suppression circuit. According to the method, a single-phase rectifier, a first direct-current converter, a second direct-current converter and a controller are included, the first direct-current converter comprises a first filter, the second direct-current converter comprises a second filter, and the single-phase rectifier is connected with the first direct-current converter and the second direct-current converter. The controller is connected with the first direct-current converter and the second direct-current converter, and the first filter is connected with the second filter; the single-phase rectifier is used for converting the first alternating-current electric signal into a first direct-current electric signal and outputting the first direct-current electric signal to the first filter and the second filter; the controller is used for adjusting voltages of the first filter and the second filter according to electric signals of the first filter and the second filter; the first filter and the second filter are used for performing low-frequency filtering processing on the first direct-current electric signal, and filter parameters of the first filter and the second filter are different. And the filtering effect on the direct current is improved.

Description

technical field [0001] The embodiments of the present application relate to the field of circuits, and in particular to a low-frequency ripple suppression circuit. Background technique [0002] An electric locomotive generally includes a power supply system, a traction motor, and auxiliary equipment (for example, lighting equipment, an air conditioner, etc.), and the power supply system can supply power for the traction motor and auxiliary equipment. [0003] The power supply system is connected with the high-voltage alternating current, and the power supply system can perform step-down processing and DC conversion processing on the high-voltage alternating current, and provide the processed current to the traction motor and auxiliary equipment. In order to provide a stable voltage to the traction motor and auxiliary equipment, the power supply system also needs to filter the DC power. The power supply system is usually equipped with a modular dual active bridge DC converter...

AI Technical Summary

Problems solved by technology

[0004] In the related art, the filter in the dual active bridge DC converter is usually a filter with no difference in filtering parameters, which cannot effectively filter out the low-frequency ripple in the DC power, resulting in a poor filtering effect on the DC power

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