Sense Boards - Revision history

Marcexec at 10:50, 14 June 2023

2023-06-14T10:50:23Z

← Older revision		Revision as of 10:50, 14 June 2023
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	Go here for information about the [[Sensor_Board\|legacy Tamura/LEM sensor boards]].		Go here for information about the [[Sensor_Board\|legacy Tamura/LEM sensor boards]].
			[[Category:OpenInverter]] [[Category:Tutorial]]

Dmpitsch at 04:54, 29 March 2019

2019-03-29T04:54:44Z

← Older revision		Revision as of 04:54, 29 March 2019
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	3 sensing boards provide the inverter with values for the DC link voltage, heat sink temperature and two phase currents.		3 sensing boards provide the inverter with values for the DC link voltage, heat sink temperature and two phase currents.

	= Voltage Sense Board +		= Voltage Sense Board =

	The voltage sense board uses an Si8920 analog isolator. It converts a voltage of 200mV on the primary (right side on schematic) into around 3V on the secondary side. Since the isolators output is differential we need an opamp circuit to make it single-ended.		The voltage sense board uses an Si8920 analog isolator. It converts a voltage of 200mV on the primary (right side on schematic) into around 3V on the secondary side. Since the isolators output is differential we need an opamp circuit to make it single-ended.

Dmpitsch: Added sense board images

2019-03-29T04:51:00Z

Added sense board images

← Older revision		Revision as of 04:51, 29 March 2019
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			[[File:voltage_sense_board.jpg\|thumb\|Voltage Sense Board]]
			[[File:schematic_voltage_sense_board.png\|thumb\|Voltage Sense Board Schematic]]
			[[File:current_sense_board.jpg\|thumb\|Current Sense Board]]
			[[File:schematic_current_sense_board.png\|thumb\|File:Current Sense Board Schematic]]

	3 sensing boards provide the inverter with values for the DC link voltage, heat sink temperature and two phase currents.		3 sensing boards provide the inverter with values for the DC link voltage, heat sink temperature and two phase currents.

	~~<u>Voltage Sense Board</u>~~		= Voltage Sense Board +

	~~<u>Voltage Sense Board Schematic</u>~~

	Voltage Sense Board

	The voltage sense board uses an Si8920 analog isolator. It converts a voltage of 200mV on the primary (right side on schematic) into around 3V on the secondary side. Since the isolators output is differential we need an opamp circuit to make it single-ended.		The voltage sense board uses an Si8920 analog isolator. It converts a voltage of 200mV on the primary (right side on schematic) into around 3V on the secondary side. Since the isolators output is differential we need an opamp circuit to make it single-ended.
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	The board also provides the connection for the heatsink temperature sensors.		The board also provides the connection for the heatsink temperature sensors.

	~~<u>Current Sense Board</u>~~		= Current Sense Board =

	~~<u>Current Sense Board Schematic</u>~~

	Current Sense Board

	The current sense board used a Melexis MLX91205 magnetic field sensor. It outputs 2.5V at 0 T and swings between 0.25V and 4.75V at +/-25mT. With a simple resistive divider that is scaled to the 3.3V range. The board is supposed to be mounted directly on the phase output cable or bus bar. The correlation between the phase current and the output swing varies with the distance between the conductor and the chip. With no further spacers the range is about 800A on cable. A busbar needs an additional isolation layer.		The current sense board used a Melexis MLX91205 magnetic field sensor. It outputs 2.5V at 0 T and swings between 0.25V and 4.75V at +/-25mT. With a simple resistive divider that is scaled to the 3.3V range. The board is supposed to be mounted directly on the phase output cable or bus bar. The correlation between the phase current and the output swing varies with the distance between the conductor and the chip. With no further spacers the range is about 800A on cable. A busbar needs an additional isolation layer.
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	Make sure to place the two sense board far apart from each other and any other high current conductor to avoid cross talk.		Make sure to place the two sense board far apart from each other and any other high current conductor to avoid cross talk.

	~~<u>Sensor Board</u>~~		= Legacy Sensor Board =

	Sensor Board

	Go here for information about the legacy Tamura/LEM sensor boards.		Go here for information about the [[Sensor_Board\|legacy Tamura/LEM sensor boards]].

Dmpitsch: Initial draft

2019-03-25T16:18:05Z

Initial draft

New page

3 sensing boards provide the inverter with values for the DC link voltage, heat sink temperature and two phase currents.

Voltage Sense Board

Voltage Sense Board Schematic

Voltage Sense Board

The voltage sense board uses an Si8920 analog isolator. It converts a voltage of 200mV on the primary (right side on schematic) into around 3V on the secondary side. Since the isolators output is differential we need an opamp circuit to make it single-ended.

The board also provides the connection for the heatsink temperature sensors.

Current Sense Board

Current Sense Board Schematic

Current Sense Board

The current sense board used a Melexis MLX91205 magnetic field sensor. It outputs 2.5V at 0 T and swings between 0.25V and 4.75V at +/-25mT. With a simple resistive divider that is scaled to the 3.3V range. The board is supposed to be mounted directly on the phase output cable or bus bar. The correlation between the phase current and the output swing varies with the distance between the conductor and the chip. With no further spacers the range is about 800A on cable. A busbar needs an additional isolation layer.

Make sure to place the two sense board far apart from each other and any other high current conductor to avoid cross talk.

Sensor Board

Sensor Board

Go here for information about the legacy Tamura/LEM sensor boards.