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GENERAL-PURPOSE IO INTERFACE OF POWER CONVERTER

IP.com Disclosure Number: IPCOM000251589D
Publication Date: 2017-Nov-14
Document File: 4 page(s) / 209K

Publishing Venue

The IP.com Prior Art Database

Related People

Maksimainen Petri: AUTHOR [+3]

Abstract

This disclosure relates to realizing a general-purpose IO (Input-Output) interface of an electric power converter, such as a frequency converter. The disclosed solution provides a robust and cost-effective method to add, if necessary, one or more digital signal inputs to an IO interface of an electric power converter. It is similarly possible to realize digital signal outputs. In the proposed solution, an analogue signal is formed from one or more digital input signals, which analogue signal is then supplied to an analogue input of the IO interface of the electric power converter control. Then, the received analogue signal may be decoded back to digital signals within the electric power converter.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 54% of the total text.

Page 1 of 4  FI-1614501

© Copyright [2017] ABB. All rights reserved.

GENERAL-PURPOSE IO INTERFACE OF POWER CONVERTER

This disclosure relates to realizing a general-purpose IO (Input-Output) interface of an

electric power converter, such as a frequency converter. The disclosed solution provides

a robust and cost-effective method to add, if necessary, one or more digital signal inputs

to the IO interface of the electric power converter control. It is similarly possible to realize

digital signal outputs.

Traditionally the general-purpose IO interface of the electric power converter, such as a

frequency converter, control has a certain number of analogue inputs and digital inputs.

However, in some situations it is possible that not all the analogue inputs are needed

while more digital inputs would be needed than available, for example. A possible

example of such a situation is a wind turbine converter cabinet, where digital inputs are

used for monitoring an internal operation of the cabinet (e.g. 15 for monitoring a fault

status of a cooling fan and 5 for monitoring a status of cabinet door positions). Is such

situations the regular amount of IO interfaces of the frequency converter control is not

adequate and more inputs (or outputs) would be needed while some inputs (or outputs)

remain unused.

One possible solution to the above problem is to use optional intelligent cards that provide

additional inputs and/or outputs and communicate with the power converter control e.g.

via serial communication.

Such a solution, however, causes extra cost: power supply must be arranged for the

optional card(s), A/D conversions performed on the optional card(s), implementing the

serial communication on the optional card(s), etc. In addition, implementing the serial or

other kind of communication, on the optional card(s) may increase a CPU load of the

card, for example.

In practice, it has been discovered that the implementation of the communication between

such optional cards and the power converter control may be unrobust to bugs of the

software design and thus cause an increase in the field fault percentage of the power

converter, for instance.

Page 2 of 4  FI-1614501

© Copyright [2017] ABB. All rights reserved.

Figure 1 shows a schematic figure of the proposed solution according to an embodiment.

In the proposed solution an analogue signal is formed, or coded, from digital input signals,

which analogue signal is then connected to an analogue input of the IO interface of the

electric power converter control. The statuses of the digital input signals may be coded

into the highest bits of the analogue signal, for instance. The number of bits available

depends on e.g. the accura...