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Current ripple reduction circuit and charger

A technology of current ripple and AC ripple, applied in the direction of battery circuit devices, circuit devices, high-efficiency power electronics conversion, etc., can solve the problems of increasing costs and losses, reduce costs and losses, suppress current ripples, and reduce suppression Effect of current ripple cost and loss on

Inactive Publication Date: 2019-09-10
LG ELECTRONICS CHINA RANDD CENT SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The added DC / DC is a full power converter, which increases cost and loss

Method used

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  • Current ripple reduction circuit and charger
  • Current ripple reduction circuit and charger
  • Current ripple reduction circuit and charger

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0031] The inventors have found that a single-phase charging circuit is usually composed of a power factor correction circuit (PFC) and DC / DC, such as Figure 5 shown. PFC makes the current at the input end of the charger a sine wave. Since the input voltage is also a sine wave, the input power of the charger contains twice the grid frequency pulsation. For a 50Hz / 60Hz grid, the pulsation power is 100Hz / 120Hz. In order to improve the service life of the battery, the charging current of the battery cannot have a large pulsating current component, which requires a full-power DC / DC converter to be...

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Abstract

The invention provides a current ripple reduction circuit and a charger. The circuit comprises a first transformer and a first AC / DC converter. A first end of the primary winding of the first transformer is connected with a first end of a DC capacitor on the output side of an external power factor correction PFC circuit, and a second end of the primary winding of the first transformer is connectedwith a first end of a first external DC load. The primary winding of the first transformer is used for coupling an alternating ripple current to the secondary winding of the first transformer. The input end of the first AC / DC converter is connected with the secondary winding of the first transformer, and the output end of the first AC / DC converter is connected with the DC capacitor on the outputside of the external PFC circuit. The first AC / DC converter is used for converting the alternating ripple current coupled to the secondary winding of the first transformer into a direct current and outputting the direct current to the DC capacitor on the output side of the external PFC circuit. The technical scheme reduces the cost and loss of current ripple suppression.

Description

technical field [0001] The invention relates to the technical field of charging, in particular to a current ripple reduction circuit and a charger. Background technique [0002] In order to reduce the current harmonics at the input end of the power supply, the power factor correction circuit Power Factor Correction (PFC) is widely used. In a single-phase system, the output of PFC contains pulsating power twice the frequency of the grid. If the DC output side is connected to a DC load such as a battery or LED, at twice the grid frequency, due to the internal resistance of the load compared to the capacitive reactance of the capacitor Much smaller, there will be a lot of current ripple across these DC loads. Ripple increases the loss of the battery itself and reduces the capacity of the battery. To reduce current ripple, as Figure 5 As shown, two-stage power conversion is usually adopted, that is, a stage of DC / DC is added after the power factor correction circuit (PFC), so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14
CPCH02J7/02H02M1/14H02M1/0048Y02B70/10
Inventor 张颖奇
Owner LG ELECTRONICS CHINA RANDD CENT SHANGHAI CO LTD