Patent ID: 9531260
Filing Date: 2016-12-27
CPC Classification: H02M,H02P,H03K

Claim Text:
1. An apparatus for generating a pulse width modulated, PWM, signal with a first period of time and a second period of time, wherein said PWM signal has a PWM pulse during the second period and does not have the PWM pulse during the first period, the apparatus comprising: a voltage source; a capacitor; an output node for outputting the PWM signal, to drive an electric motor; a switchable circuit assembly for connecting the voltage source, the capacitor and the output node; and control means for controlling switching of the switchable circuit assembly, wherein the switchable circuit assembly is adapted to be switchable between a first circuit configuration in which the capacitor is connected in parallel to the voltage source so as to be chargeable by the voltage source, and a second circuit configuration in which the capacitor is connected in series between the voltage source and the output node such that polarities of the voltage source and the capacitor are aligned with each other; and wherein the control means is adapted to control the switchable circuit assembly to switch to the first circuit configuration in the first period, and to switch to the second circuit configuration in the second period.