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DMA (direct memory access) method for realizing converter fault storage by using CF (compact flash) card

A converter and fault technology, which is applied in the field of direct memory access of CF card, can solve problems such as bus conflicts and poor real-time performance, and achieve the effects of saving CPU overhead, easy CPU programming, and automatic timing matching

Active Publication Date: 2014-09-24
CORONA WIND EQUIP BEIJING CO LTD
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AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the poor real-time performance in the existing CF card embedded application field, especially in the multi-parallel peripheral system, the problem of bus conflict caused by the CF card adopting the DMA mode, and to provide a method of using the CF card to realize the double-fed converter in the wind power field method of device fault storage

Method used

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  • DMA (direct memory access) method for realizing converter fault storage by using CF (compact flash) card
  • DMA (direct memory access) method for realizing converter fault storage by using CF (compact flash) card
  • DMA (direct memory access) method for realizing converter fault storage by using CF (compact flash) card

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] A 1.5MW low-cost converter product is taken as an example to illustrate the fault storage method of the converter implemented by using a CF card in the present invention.

[0023] The CF card supports a variety of interface access modes, including Memory Mapped mode, I / O Card mode and True IDE mode conforming to the PCMCIA standard. When the power is turned on, the pin OE is high level, and the CF card enters PCMCIA mode; the pin OE is low level, and the CF card enters True IDE mode, see Table 1. At this time, the pin OE is also called ATA SEL; The invention chooses the more general True IDE mode, which supports three modes of PIO, Multi-Word DMA and Ultra DMA. After power on, the default is PIO mode. Configure the CF card through the PIO command to enter the DMA mode. Because the Ultra DMA adopts the dual-edge of the clock to collect...

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Abstract

The invention relates to a DMA (direct memory access) method for realizing converter fault storage by using a CF (compact flash) card, which is used for realizing the fault storage by a CF card DMA mode in a multi-parallel port peripheral bus system of a double-feed converter. The method comprises the following steps: firstly, reasonably planning multi-parallel port peripheral address fields to make the multi-parallel port peripheral address fields meet control requirements of the CF card DMA mode; and secondly, performing combinational logic control on CF card read-write and other critical control signals by using a programmable controller CPLD (complex programmable logic device) so as to realize automatic DMA pause of the CF card when a CPU (central processing unit) bus accesses a non-DMA operation address and automatic restoration of the DMA function when the CPU bus accesses a DMA operation address, and solve the problem of bus conflict in the CF card DMA data exchange process.

Description

technical field [0001] The invention relates to a CF card direct memory access (DMA) method for converter fault storage. Background technique [0002] CF card is a standard device that includes control and large-capacity Flash memory. It has the advantages of large capacity, small size, high performance, and easy portability. It has been widely used in data acquisition systems and many information electronic products. [0003] With the rapid development of green energy in recent years, doubly-fed wind converters have become mainstream products in the field of wind power generation above the megawatt level. [0004] Converters are generally installed in areas rich in wind resources, located in remote areas, and it is difficult to monitor the whole process on site. As we all know, doubly-fed motor is a multi-variable, strongly coupled system with complex control and error-prone; in terms of hardware, the converter has a large number of components and a high probability of fai...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F13/28
Inventor 柏建军刘东升林资旭李海东赵栋利赵斌
Owner CORONA WIND EQUIP BEIJING CO LTD
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