Abstract: A battery protection circuit has two input nodes and two output nodes. The input nodes are connected to a positive supply line and a negative or ground line respectively, and the two output nodes are connected to a positive side of a load and a negative or ground return side of the load. The circuit includes a solid state switch which is oriented such that when the switch is open current cannot flow from the battery through the load. At least one capacitor is connected in series with a diode between the two input nodes of the circuit to smooth out any negative transient voltages present at the positive input node of the circuit. The capacitor includes a polarized capacitor and the diode is oriented to protect the capacitor during normal use when a positive voltage is present at the input node that is connected to the positive supply line.

Abstract: A battery protection circuit has two input nodes and two output nodes. The input nodes are connected to a positive supply line and a negative or ground line respectively, and the two output nodes are connected to a positive side of a load and a negative or ground return side of the load. The circuit includes a solid state switch which is oriented such that when the switch is open current cannot flow from the battery through the load. At least one capacitor is connected in series with a diode between the two input nodes of the circuit to smooth out any negative transient voltages present at the positive input node of the circuit. The capacitor includes a polarized capacitor and the diode is oriented to protect the capacitor during normal use when a positive voltage is present at the input node that is connected to the positive supply line.

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).