Abstract: Aspects of the disclosure can relate to systems or devices for detecting a lifespan parameter of a power transistor of an electronic device. In an embodiment, a device can include a differential probe configured to connect to a first terminal and a second terminal of a power transistor. The device can also include a voltage detector that senses a voltage signal from the differential probe and a controller configured to determine a lifespan parameter of the power transistor based on the voltage signal. In another embodiment, the voltage detector and the controller can be included in an electronic device (e.g., a drilling tool or another downhole tool). In another embodiment, the voltage detector can be in the electronic device, where the electronic device includes an external port that provides a differential voltage signal detected by the voltage detector to an external measurement tool (e.g., oscilloscope or the like).

Abstract: A downhole electrical power grid electrically connects a string of downhole tools including at least a first power generating tool and a second power consuming tool. The power generating tool includes a power generator, an electric load, and a power management controller. The power management controller is configured to automatically electrically connect and disconnect the tool from the power grid. The power generating tool may include a rotary steerable tool having a power generator, an electric actuator, and the aforementioned power management controller.

Abstract: A downhole electrical power grid electrically connects a string of downhole tools including at least a first power generating tool and a second power consuming tool. The power generating tool includes a power generator, an electric load, and a power management controller. The power management controller is configured to automatically electrically connect and disconnect the tool from the power grid. The power generating tool may include a rotary steerable tool having a power generator, an electric actuator, and the aforementioned power management controller.