Abstract: A circuit for controlling at least two power switches that are series connected between a source of electrical power and an electrical load, for energizing the load in response to a signal at a control input. The circuit includes a programmed controller having an input as the control input and a voltage sensor circuit connected to sense the voltage between the power switches and apply a voltage signal to a controller input. It may also have a sensor for sensing the current through the switches and applying a current signal to the controller. The controller inputs the voltage between the switches or the current through the switches to provide a sensed first value. It compares the sensed first value to an expected first value that exists if both switches are turned off. One of the two switches is turned on if the sensed first value is equal to the expected first value.

Abstract: A mobile system for transfilling gas canisters, including revised components designed for mobility and a method for implementing the same is disclosed.

Abstract: An interdependent control apparatus for an accessory mounted to a vehicle. An accessory control connector is connected to the vehicle's on board diagnostic port data bus and an accessory microcontroller is in data communication with the accessory control connector. An output device associated with and operating a component of the accessory is in data communication with the accessory microcontroller for control of an accessory parameter. Parameters of a vehicle are also controlled by the accessory microcontroller. Data from the accessory is also input to the accessory microcontroller representing a parameter of the accessory. Data is input from both the data bus and the vehicle accessory to the accessory microcontroller. Output control data from the accessory microcontroller can control a vehicle parameter and most importantly controls an accessory parameter.