Patent ID: 11881775
Assignee: MICROCHIP TECHNOLOGY INCORPORATED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A power converter comprising:
a switching circuit to selectively provide an input voltage to a switching node at a switching frequency to establish a charging cycle and a discharging cycle based upon a modulated control signal to generate a low supply voltage having a low supply voltage magnitude at a first output node of a power converter, wherein the switching circuit comprises a first capacitor coupled between the first output node of the power converter and a ground node;
an input voltage cancellation circuit coupled to the switching node, wherein the switching circuit further comprises a first diode coupled between the input voltage cancellation circuit and the first output node of the power converter, wherein the input voltage cancellation circuit comprises a second capacitor coupled between the switching node and the first diode and a second diode coupled between the second capacitor and the ground node, and wherein the switching frequency of the switching circuit is such that a bias on the second capacitor does not have adequate time to discharge during the discharging cycle of the switching circuit so as to maintain an offset across the second capacitor equal to the input voltage thereby cancelling out the input voltage selectively provided to the switching node by the switching circuit such that the switching node swings by an amount which is independent of an amplitude of the input voltage; and
a boost circuit coupled to the switching node and to the switching circuit, the boost circuit operable to generate a high supply voltage having a high supply voltage magnitude at a second output node of the power converter, wherein the high supply voltage magnitude is a multiple of the low supply voltage magnitude.