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Switched capacitor converter and pre-charging method thereof

A technology of switched capacitors and converters, applied in the field of switched capacitor converters and their precharging, can solve the problems of rising costs, increased precharging costs, unfavorable market promotion, etc., and achieves the effect of reducing precharging costs

Pending Publication Date: 2021-12-24
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, adding additional circuits will increase the pre-charging cost of the SCC, leading to an increase in the overall cost of the SCC, which is not conducive to market promotion

Method used

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  • Switched capacitor converter and pre-charging method thereof
  • Switched capacitor converter and pre-charging method thereof
  • Switched capacitor converter and pre-charging method thereof

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specific Embodiment approach

[0059] In another embodiment of the present application, as image 3 As shown, a specific implementation of step S130 specifically includes the following steps:

[0060] S210. Calculate according to the formula N×Ucf / Uin.

[0061] Among them, N is equal to the difference between the number of levels of the SCC minus 1, Ucf is the voltage across the resonant capacitor, and Uin is the input voltage of the SCC.

[0062] S220. Carry out an upward rounding operation on the above calculation result, and add 1 to obtain the lowest voltage level of the SOC.

[0063] For example, taking a three-level SCC as an example, assuming that the three levels of the SCC, that is, three voltage levels, are: 0V, 500V, and 1000V; when the voltage across the resonant capacitor is 400V, then N×Ucf / Uin=2×400÷1000=0.8, equal to 1 after rounding up, that is, the lowest voltage level is the second level, that is, the SCC charges the resonant capacitor with a voltage of 500V.

[0064] In step S210, th...

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Abstract

The invention provides a switched capacitor converter and a pre-charging method thereof. The pre-charging method comprises the following steps: detecting a target parameter of a resonant capacitor in the switched capacitor converter SSC in real time or periodically; and when the target parameter is less than or equal to a preset value, determining that the SCC is greater than the lowest voltage level of the voltages at the two ends of the resonant capacitor at the current moment, and controlling the SCC to work in a charging state of the lowest voltage level, namely, enabling the SCC to charge the resonant capacitor at the minimum voltage greater than the voltages at the two ends of the resonant capacitor at the current moment. As a whole, the SCC can charge the resonant capacitor in a segmented manner, so that the voltage at the two ends of the resonant capacitor can be slowly increased, and the pre-charging of the resonant capacitor is realized. Besides, the pre-charging method of the switched capacitor converter is only an improvement on a software level and does not relate to an improvement on a hardware level, so that the pre-charging cost of the SCC is reduced by the pre-charging method of the switched capacitor converter.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a switched capacitor converter and a precharging method thereof. Background technique [0002] Before the switched capacitor converter (Switched Capacitor Converter, SCC) works normally, it is necessary to precharge the resonant capacitor in the SCC so that the resonant capacitor has an initial voltage to meet the normal startup requirements of the SCC, that is, when the SCC works normally, No large current impact will be caused in the loop between the resonant capacitor and the input side of the SCC, thereby protecting the power devices on the loop. [0003] Usually, by adding a soft-start circuit, that is, adding a current-limiting branch, the voltage at both ends of the resonant capacitor rises slowly, so as to realize the pre-charging of the resonant capacitor. However, adding an additional circuit will increase the pre-charging cost of the SCC, leading to an incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07
CPCH02M3/07
Inventor 何安然陈鹏孙帅王志成颜世超孟鹏飞
Owner SUNGROW POWER SUPPLY CO LTD
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