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A control method and device for a DC converter

A technology of a DC converter and a control method, applied in the direction of converting DC power input to DC power output, output power conversion device, control/regulation system, etc., can solve the problems of high frequency oscillation of input current and filter capacitor voltage, and achieve The effect of avoiding high frequency vibration, working noise and electromagnetic interference

Active Publication Date: 2019-05-31
VERTIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Embodiments of the present invention provide a control method and device for a DC converter to solve the problem of high-frequency oscillation of the input current and filter capacitor voltage

Method used

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  • A control method and device for a DC converter
  • A control method and device for a DC converter
  • A control method and device for a DC converter

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Embodiment Construction

[0047] In order to provide an implementation plan for solving the problem of high-frequency oscillation of the input current and filter capacitor voltage, the embodiment of the present invention provides a control method and device for a DC converter. The preferred embodiment of the present invention will be described in conjunction with the accompanying drawings. It should be It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, not to limit the present invention. And in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0048] An embodiment of the present invention provides a method for controlling a DC converter. The DC converter includes a DC / DC conversion circuit and at least one filter capacitor; for each filter capacitor, one end of the filter capacitor is connected to the DC / DC conversion circuit. The con...

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Abstract

The invention discloses a control method and a control device for a direct-current converter in order to solve the problem of high-frequency oscillation occurring to input current and filter capacitor voltage. According to the control method, when there is a need to switch the state of a first switching unit in a direct-current converter from high-frequency chopping to power-frequency long pass, the duty ratio of the drive signal of the first switching unit is changed to a first preset duty ratio under control according to a first preset step length.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a control method and device for a DC converter. Background technique [0002] Some current devices such as Uninterruptible Power Supply (UPS, Uninterruptible Power Supply), in order to save costs, usually make the power factor correction (PFC, Power Factor Correction) circuit share components with the DC converter as much as possible during circuit design. E.g figure 1 The uninterruptible power supply shown is an example of a better sharing scheme; in the battery mode, the DC converter in the dotted box performs step-up conversion on the battery voltage; in the mains mode, the DC converter in the dotted box It forms a power factor correction circuit with the rectifier bridge of the previous stage to realize the power factor correction function. Among them, the capacitor C1 is a filter capacitor introduced to solve the problem of high-frequency jump of the negative ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/44
Inventor 肖正虎刘中伟卫建荣
Owner VERTIV CORP
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