SK645SLASH50SLASHSA datasheet(6/30 Pages) ONSEMI

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SECO−MDK−4KW−65SPM31−GEVB

www.onsemi.com

described in more detail in the UCB Controller section and

in Low−power Connectors, High−power Connectors, and in

Appendix. The applied design has been influenced by the

AND9390/D [10] and the NFAM5065L4B [2] data sheet.

Current Measurement

The development system is round out by the NCS2250

High Speed Comparator, the NCS20166 precision

low−offset Op−Amp, and the NCD98011 UCB integrated

ADC module. Currently, ADC resolution is 11−bit resulting

in an overall resolution of 0.016 A/bit, while the range of

phase−current measurement is set to

±16.5 A. The

NCS20166 gain selection, the current sense resistor

selection, and the NCD98011 ADC module that is integrated

in UCB define the overall current resolution. The overall

resolution and maximum current range can be found in

Table 1. More details around the SAR concept and

NCD98011 can be found in [9].

DC−Link and Inverter Phase−voltages Measurement

The DC−Link and inverter phase−voltage are both sensed

via resistive voltage divider circuits, where the scaled−down

voltage signals are used as inputs for the integrated UCB

ADC − NCD98011 − modules. As mentioned above, overall

resolution and maximum voltage range can be found in

Table 1.

Over−current Protection and Under Voltage Protection

Fault

The hardware over−current protection leverages the

disable−option on the IPM. This function exploits the

disable pin (CIN pin) of IPM, via the ITRIP signal that is

provided to the power module by the NCS2250 comparator.

The disable−pin (CIN pin) is also controlled by UCB

controller, allowing the end−user to configure a multilayer

overcurrent protection. Finally, the end−user may also

leverage the output fault signal of IPM (VFO), using the

UCB controller. Note that VFO output is routed to UCB. As

such, when a fault arises the software can use VFO output

accordingly to shut down system operation or take other

actions. Note that the above protection mechanism is

implemented in software level, and as such it might be

subjected to delays or spurious tripping if not properly

handled.

UCB Controller

The UCB is a powerful universal motor controller that is

based on SOC Zynq 7000 series [11]. It includes a dual

667 MHz CPU Cortex A9 core, with freely configurable

digital peripheral, bootloader capability via micro SD card,

USB/UART/JTAG interface, 32 Mbyte Flash memory,

32−Bit−wide 256 MByte DDR3 SDRAM, on−board

Ethernet phy, 10 ADC channel – using ON Semiconductor

NCD98011), and 12 complementary PWM channels. The

UCB is an industrial−grade System on Module (SoM) that

can be used for advanced networked motor and motion

control systems, capable of delivering advanced control

strategies for different types of motors (AC induction motor,

PMSM, BLDC).

The UCB controller interacts with the power board via

specific pins, which are routed to two − 120 pins each –

connectors. More details around the connectors can be found

in Board Connectors. Auxiliary 5 Vdc and 3.3 Vdc power

supplies can be used for powering−up the UCB board. They

are located at the main power board. Alternatively, the UCB

can be powered−up from the 5 Vdc USB cable, which is

connected to the controller. Then, the UCB generates all the

voltage rails (3.3 Vdc included) that are required for its

proper operation. In addition, it also delivers (independently

of the main auxiliary supplies) the necessary 5 Vdc and

3.3 Vdc reference voltages for the Op−Amps and

comparators on the power board. Therefore, functionality of

the controller, as well as the functionality of the Op−Amps

and comparators can be evaluated even when the main

power board auxiliary supplies are off.

Finally, the UCB provides the control capabilities of the

system, and supports the user interface communication. End

user can develop its own applications to exploit the UCB

features and capabilities. As mentioned earlier the

MDK_SPM31 power board provides all the required

feedback to the UCB for the generation of PWM driving

signals to control the IGBT module gate drivers as well as

to enable/disable the module in the event of faults arising.

This allows end−user to develop many different control

strategies from simple V/F and Field Oriented Control

(FOC) up to predictive control algorithms. Moreover, the

UCB enables bidirectional serial communication to transfer

measurements data for visualization purposes. A Graphical

User Interface is provided, along with an appropriate code

in flash that can run a simple V/F control or an FOC and

allow visualization of key electrical quantities. More details

around the software can be found in Software section. The

interface header pinout of MDK_SPM31 is described in

detail in Board Connectors. A detailed description of the

UCB connector can be found in Appendix. Finally, the

documentation around UCB can be found in [1].

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