EPC Control Modes Guide
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Epic Power Converters, S.L. CIF: B99349623 Calle F Oeste, Nave 93. Grupo Quejido Polígono Malpica - 50016 - Zaragoza (Spain) info@epicpower.es - www.epicpower.es AN049 EPC Control Modes Guide EPC Control Modes Guide Introduction This document goes deep into the flow of the CAN communications depending on the EPC mode. Current Controlled Mode (CCMode) In this mode, the external controller will set the current reference for the High Voltage DC side (HVDC side) or de Low Voltage DC side (LVDC side). - Positive current: is defined as transferring energy from High Voltage DC side (HVDC side) to Low Voltage DC side (LVDC side). It is also called charging direction. High Voltage Side Negative current: is defined as transferring energy from Low Voltage DC side (LVDC side) to HVDC side. It is also called discharging direction. High Voltage Side In order to avoid errors during transfer process, there is a security signal that has to be sent to set the current direction. If the voltage (in high or low side) goes beyond the limits, the DCDC converter will stop and show an error. Once the voltage returns to the nominal range and a reset is performed, current control is re-established. When the EPC is disabled through CAN or hardware enable input, reset of errors is performed.

High Side Voltage Controlled Mode (HSVCMode) In this mode, the external controller will set the voltage reference for the High Voltage DC side (HVDC side). Power and current limits can be configured. EPC will manage the power flow aiming to maintain the high side voltage reference. The external controller is able to choose bidirectional operation or unidirectional in any direction thanks to “Power Flow Direction” signal. Some limits in the LVDC can be configured in order to protect the energy source connected to the LVDC. If LVDC voltage goes above “LVDC max voltage”, charging power flow...

High Side Voltage Photovoltaic Mode (HSPVMode) In this mode, the EPC converter performs MPPT tracking algorithm in the HVDC side. This mode is used when solar panels are connected to the HVDC side. The external controller is able set the voltage reference for the LVDC side. Also current or power limits can be configured. LVDC voltage reference and HVDC voltage limits must be configured in the same way than LSVCMode). The energy flows only in charging direction. (Energy is transferred from HVDC to LVDC side) Low Side Voltage Photovoltaic Mode (LSPVMode) In this mode, the EPC converter...

Figure 1. Flow chart CCMode Epic Power Converters, S.L. CIF: B99349623 Calle F Oeste, Nave 93 Grupo Quejido – Pol. Malpica 50016 - Zaragoza (Spain) info@epicpower.es www.epicpower.es

Figure 2. Flow chart HSVCMode Epic Power Converters, S.L. CIF: B99349623 Calle F Oeste, Nave 93 Grupo Quejido – Pol. Malpica 50016 - Zaragoza (Spain) info@epicpower.es www.epicpower.es

Figure 3. Flow chart LSVCMode Epic Power Converters, S.L. CIF: B99349623 Calle F Oeste, Nave 93 Grupo Quejido – Pol. Malpica 50016 - Zaragoza (Spain) info@epicpower.es www.epicpower.es

Figure 4. Flow chart HSPVMode Epic Power Converters, S.L. CIF: B99349623 Calle F Oeste, Nave 93 Grupo Quejido – Pol. Malpica 50016 - Zaragoza (Spain) info@epicpower.es www.epicpower.es

Figure 5. Flow chart LSPVMode Epic Power Converters, S.L. CIF: B99349623 Calle F Oeste, Nave 93 Grupo Quejido – Pol. Malpica 50016 - Zaragoza (Spain) info@epicpower.es www.epicpower.es