Methods, systems and circuits for controlling the power available to the load, by reducing the power available to the load, and additionally or alternatively, limiting the current available by pre-establishing a maximum reference current. The reference current is compared to the actual or estimated current drawn by the load or part of the load. The comparison result is used to control a device or switch which disconnects the power supply or power supply regulator, whether connected directly to the load or connected via voltage dropping device, to one or more or a plurality of the load blocks when the maximum current is exceeded.