Powering the Starter Kit and Power Budgets

Kria KD240 Drive Starter Kit User Guide (UG1093)

Document ID
UG1093
Release Date
2024-04-24
Revision
1.1 English

The Kria™ KD240 Drives Starter Kit requires a 12 V, 3 A power supply adapter to power the kit. The adapter is included in the kit. The power supply adapter barrel connector plugs into the DC jack (J12) to supply the +12 V power source to KD240 Starter Kit. When using the inverter driver, power must also be supplied to the DC link power circuit. There is added protection between the two power domains to protect each circuit from damage if an incorrect power-up order occurs. A suggested +24 V power source is available for purchase with an accessory kit that also includes an adapter to allow the supply to interface to the kit. Using the adapter connected to the power-supply barrel connector, insert the DC link end into the DC link power connector (J39).

Powering the K24 SOM

  • The KD240 Starter Kit carrier card on-board regulator generates a 5 V supply and provides power to other voltage regulators.
  • The SOM power rail (VCC_SOM) is powered by the 5 V supply.
  • Next, the SOM on-board power-on sequencing starts.
  • The carrier card provides the programmable logic (PL) the VCCO voltage rails after the SOM asserts the VCCOEN_PS_M2C and VCCOEN_PL_M2C signals.

Power Telemetry

A power monitor device is available on the SOM power rail (SOM_5V0). You can access the total power consumed by the SOM module through the I2C bus and AMD provided utilities.

Additional power telemetry is added to the inverter drive portion of the KD240 Starter Kit. You can access the total power consumed by the DC link circuit through direct readback of the provided dual simultaneous sampling, 12-bit analog-to-digital converter (ADC). Because the drive circuit is designed for up to three phases of drive power, an additional three ADC circuits are provided to measure each phase. The interface to these ADCs are wired in parallel, providing a simultaneous read of each phase. The dual simultaneous sampling of each ADC is configured with conditioning circuitry making each simultaneous sample of input a simultaneous read of both voltage and current, providing an accurate accounting of power for each of the four telemetry areas of interest.

Powering Peripherals

The KD240 Starter Kit carrier card supplies power to the I/O peripherals as specified by the following interface specifications.

USB3.0

There are two USB3.0 interface ports available on the KD240 Starter Kit carrier card. There is one independent USB controller. Each port can deliver a 5 V supply to the attached I/O peripherals with up to 900 mA per port. All ports are protected against an over-current event through a 1.0 A power switch.

Note: The total current (across all ports) is allocated at 1.0 A.

Pmod Connector

The 12-pin Pmod interface (from Digilent Inc.) is specified to be 3.3 V, 100 mA. The interface is supported by a 3.3 V, 1.0 A capacity.

microSD Card

The microSD card is supported by the 3.3 V supply voltage with a power budget of 200 mA. This should be more than adequate for standard cards. It is also not explicitly limited.

CAN Connector

Controller area network (CAN) connectivity is provided by a high-speed CAN transceiver that supports a PS MIO-based CAN controller. The KD240 Starter Kit provides selectable 60 Ω termination resistors (J19/J20). Wiring in a CAN bus is performed using the screw terminal (J18).

RS485 Connector

The PS MIO-based RS485 is provided using a galvanically-isolated transceiver containing an isolated DC-DC converter for the network side. The KD240 Starter Kit provides selectable 120 Ω termination through a jumper (J21). Wiring in the RS485 network is performed using the screw terminal (J22).

Torque Sensor Connector

The torque sensor connector is supported by the 4.5 V TRQ supply voltage, with a power budget of 400 mA. It is designed to support 350 Ω and 120 Ω passive strain gauges wired into the torque sensor connector (J45).

Inverter DC Link Connector

The DC link power comes from the two-position connector (J39). This source is protected from the rest of the board (12 V power domain), to provide an easier workflow while experimenting. Power can be provided with an accessory supply provided with the add-on accessory kit, which includes a 24 V supply and a barrel to DC link adapter cable. This input voltage and current sets much of the inverter control circuitry limitations and capabilities. This directly impacts the safe operating area (SOA) of the driver stage. Refer to the KD240 Starter Kit Power Specifications table in the Kria KD240 Drives Starter Kit Data Sheet (DS984) for more information around the interface current.

3-Phase Inverter Connector

The KD240 Starter Kit is designed to accommodate various motor types. To connect a motor, a three-position connector is provided (J32). This connector easily allows interfacing with a three phase motor up to the safe operating area (SOA) of the MOSFET driver. Refer to the CSD18512 data sheet for more details and design criteria surrounding the SOA. The voltage is set by the DC link voltage input.

Quadrature Encoder Connectors

The encoder input connectors provide the interface for a mutually exclusive single-ended encoder or a differential encoder. Choosing the encode type is based on jumper position (J44). Position 1-2 selects the differential data path. Position 2-3 selects the single-ended data path. Voltage for the selected encoder is provided by the PL 5.0 V rail and budgeted as 100 mA, although not explicitly limited. Inputs are buffered to protect the SOM PL input pins.

Brake Control Connector

On the KD240 Starter Kit, a connector is provided for brake control. The brake control connector provides switched DC link voltage. It is limited by the safe operating area (SOA) of a CSD18512 MOSFET. Wiring is provided by a three-position screw terminal.

1-Wire Sensor

To provide better sensory input, a screw terminal (J47) is available to use a 1-Wire sensor. Digital sensors are easy to interface with and are accurate, especially in a situation where instant read of general temperature is needed. Power is provided by the PL 3.3 V rail and 100 mA is budgeted. This power is not explicitly limited.