Power Supply For AGX Orin

[blhf]

Hi:

I’m developing on the Jetson AGX Orin 64GB developer kit and trying to deploy it on a mobile robot. So instead of powering it via the official adapter, I need to connect the board to a LiFePo4/LiPo battery.

Is there an official guideline or requirement for choosing a battery? For example, voltage, peak power, and ripple requirements. Do I need to add any protection circult between the battery and AGX Orin?

[carolyuu]

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To connect the Jetson AGX Orin 64GB developer kit to a LiFePo4/LiPo battery, you’ll need to consider several factors to ensure safe and reliable operation. While there isn’t a specific official guideline for choosing a battery, we can derive some requirements from the Jetson AGX Orin documentation and general power management principles.

Voltage Requirements:
The Jetson AGX Orin 64GB developer kit uses a 12V power input, which is specified in the Jetson AGX Orin Developer Kit User Guide. To ensure compatibility, you should choose a battery with a voltage range that matches this requirement.

For LiFePo4 batteries, a typical voltage range is 12.8V (fully charged) to 10.5V (fully discharged). For LiPo batteries, the voltage range is typically 12.6V (fully charged) to 9.9V (fully discharged). Make sure to select a battery with a voltage range that fits within the 12V input requirement.

Peak Power Requirements:
The Jetson AGX Orin 64GB developer kit has a maximum power consumption of 40W (for the Orin NX series) or 25W (for the Orin Nano series). You should choose a battery with a peak power rating that exceeds this value to ensure reliable operation.

Assuming a 40W peak power requirement, you’ll want a battery with a capacity of at least 40Wh (Watt-hours). However, it’s recommended to oversize the battery to account for any unexpected power surges or spikes.

Ripple Requirements:
The Jetson AGX Orin 64GB developer kit has a specified ripple requirement of 100mVpp (peak-to-peak) for the 12V input. You should choose a battery with a ripple rating that meets or exceeds this value.

Protection Circuit Requirements:
To ensure safe and reliable operation, it’s highly recommended to add a protection circuit between the battery and the Jetson AGX Orin 64GB developer kit. This circuit should include:

1. Overcharge protection: to prevent the battery from being overcharged, which can cause damage or even a fire.
2. Over-discharge protection: to prevent the battery from being deeply discharged, which can cause damage or reduce its lifespan.
3. Short-circuit protection: to prevent damage to the battery or the Jetson AGX Orin 64GB developer kit in case of a short circuit.
4. Voltage regulation: to ensure a stable 12V output to the Jetson AGX Orin 64GB developer kit.

You can use a dedicated battery management system (BMS) or a power management IC (PMIC) to implement these protection features.

Comparison with Official Adapter:
The official adapter for the Jetson AGX Orin 64GB developer kit is a 12V, 5A power supply, which provides a stable 12V output with minimal ripple. When choosing a battery, you should aim to match or exceed the performance of this official adapter.

In summary, when selecting a battery for your mobile robot, make sure to consider the following factors:

• Voltage range: 12.8V (fully charged) to 10.5V (fully discharged) for LiFePo4 batteries or 12.6V (fully charged) to 9.9V (fully discharged) for LiPo batteries.
• Peak power rating: at least 40Wh (Watt-hours) to ensure reliable operation.
• Ripple rating: 100mVpp (peak-to-peak) or better.
• Protection circuit: include overcharge, over-discharge, short-circuit, and voltage regulation features.

By following these guidelines, you can ensure safe and reliable operation of your Jetson AGX Orin 64GB developer kit with a LiFePo4/LiPo battery.

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