US 11,757,443 B2
Electrical switching systems including constant-power controllers and associated methods
Pietro Filoramo, Syracuse (IT); Benedetto Marco Marletta, Aci Sant'Antonio (IT); Carmelo Francesco Maria Marchese, Catania (IT); and Angelo Genova, Mascalucia (IT)
Assigned to Maxim Integrated Products, Inc., San Jose, CA (US)
Filed by Maxim Integrated Products, Inc., San Jose, CA (US)
Filed on Jan. 9, 2023, as Appl. No. 18/94,809.
Application 18/094,809 is a continuation of application No. 17/197,469, filed on Mar. 10, 2021, granted, now 11,552,628.
Claims priority of provisional application 62/987,491, filed on Mar. 10, 2020.
Prior Publication US 2023/0155584 A1, May 18, 2023
Int. Cl. H03K 17/0812 (2006.01); H03K 17/0412 (2006.01)
CPC H03K 17/08122 (2013.01) [H03K 17/04123 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A constant-power control method of a switching device, comprising:
using a voltage (Vs) across the switching device to generate a first signal (Vc) on a terminal of a capacitor connected to ground;
generating a second signal representing a current proportional to Vs; and
generating a third signal to control first and second driver switches to generate a pulse width modulated signal from the first (Vc) signal to control the switching device by:
charging the capacitor in response to opening a switch across the capacitor; and
changing the status of the third signal when the capacitor has reached a reference voltage (Vref);
wherein a duration (ta) of the pulse width modulation signal in an active phase is at least partially based on the first signal.