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Cypress provides the CY3274 High Voltage Programmable PLC Development Kit (DVK) for evaluating the Cypress
PLC solution.
The CY3274 is designed with the filtering and power supply circuitry to operate on 110-240 V AC powerlines. They
are compliant to the following CENELEC and FCC standards:
Powerline Signaling (EN50065-1:2001, FCC Part 15)
Powerline Immunity (EN50065-2-1:2003,
EN61000-3-2/3)
Safety (EN60950)
The CY3274 kits are used to develop a powerline controller and embedded host application on the CY8CPLC20
Programmable PLC device. They contain many user interface options such as I2C, RS232, GPIO, analog voltage,
LCD display, and LED to develop a full application.
The following sections describe the design of the filter circuits and power supplies, including the selection of critical
components for meeting performance and compliance requirements.
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High Voltage Board Design

This section describes the design of the high voltage (110 V AC to 240 V AC) PLC boardCY3274.
The design includes all circuitry to meet the requirements for signaling on high voltage lines according to the
EN50065-1:2001 standard. The high voltage boards include an isolated offline switch mode power supply accepting
input voltages in the range of 110-240 V AC, and 50-60 Hz line frequency, operating off the same powerlines that
carry the communication signaling.
The design contains transmit signal filtering and amplification to meet the conducted emissions requirements of the
CENELEC and FCC standards. It also has receive signal filtering and signal isolation external to the Cypress PLC
device. This provides a compact and low cost implementation that is adaptable to a wide variety of PLC applications.
The schematic in
Figure 2
coupling circuit to the high voltage powerline. The Bill of Materials (BOM) of these components is listed in
www.cypress.com
Figure 1. Cypress PLC Solution Block Diagram
shows the Cypress high voltage board's transmit filter and amplification, receive filter, and
Document No. 001-55427 Rev. *E
Cypress Powerline Communication Board Design Analysis
Table
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