Abstract: A safety protection circuit is described, comprising a fuse, a first voltage detection circuit, a first Silicon-Controlled Rectifier, SCR, wherein the first SCR is triggered upon detection of a threshold voltage by the first voltage detection circuit, a second voltage detection circuit, and a second SCR, wherein the second SCR is triggered upon detection of a threshold voltage by the second voltage detection circuit.

Abstract: There is provided a method and apparatus for controlling harmonics. For each device in an array of devices, a level of harmonic control is acquired to apply to an alternating current voltage powering the device. The level of harmonic control defines a period in a cycle of the alternating current voltage in which to drop the alternating current voltage. For each device in an array of devices, the alternating current voltage powering the device is controlled by dropping the alternating current voltage in the period defined by the acquired level of harmonic control.

Abstract: Methods and apparatus for assessing power usage of at least one printer component in a printer are described. For example, based on a print instruction (the print instruction being to cause the printer to carry out a printing task), power usage requirements of the at least one printer component in carrying out the print instruction may be determined. The power usage may be determined for each of a plurality of time intervals. In some examples, the effect of the printer component(s) in carrying out the print instruction on at least one power quality measure associated with a power supply network which may be connected to the printer may be considered.

Abstract: A controller is to control a discharger to provide power from an energy storage to an electrical device during a period when the electrical device is to require a power maximum. The controller is to control the charger to provide power from a power supply to the energy storage during a period when the electrical device is to require a power minimum. The electrical device is to be powered by a power supply.

Abstract: Devices and methods are provided for mitigating printer damage risks. In examples a presence of a set of damage risk indicator signals at a printer is identified. A time period during which the damage risk indicator signals of the set are concurrently present is tracked, and a power supply is cut off if the time period exceeds a predetermined threshold time.

Abstract: A safety protection circuit is described, comprising a fuse, a first voltage detection circuit, a first Silicon-Controlled Rectifier, SCR, wherein the first SCR is triggered upon detection of a threshold voltage by the first voltage detection circuit, a second voltage detection circuit, and a second SCR, wherein the second SCR is triggered upon detection of a threshold voltage by the second voltage detection circuit.

Abstract: Devices and methods are provided for mitigating printer damage risks. In examples a presence of a set of damage risk indicator signals at a printer is identified. A time period during which the damage risk indicator signals of the set are concurrently present is tracked, and a power supply is cut off if the time period exceeds a predetermined threshold time.

Abstract: Methods and apparatus for assessing power usage of at least one printer component in a printer are described. For example, based on a print instruction (the print instruction being to cause the printer to carry out a printing task), power usage requirements of the at least one printer component in carrying out the print instruction may be determined. The power usage may be determined for each of a plurality of time intervals. In some examples, the effect of the printer component(s) in carrying out the print instruction on at least one power quality measure associated with a power supply network which may be connected to the printer may be considered.

Abstract: A controller is to control a discharger to provide power from an energy storage to an electrical device during a period when the electrical device is to require a power maximum. The controller is to control the charger to provide power from a power supply to the energy storage during a period when the electrical device is to require a power minimum. The electrical device is to be powered by a power supply.