Patent ID: 11909316
Assignee: PSEMI CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. A power converter including:
(a) a converter circuit configured to convert an input voltage VIN to a different output voltage VOUT;
(b) a control block for disabling operation of the converter circuit;
(c) a voltage node VX between the converter circuit and the output VOUT;
(d) a VIN detection block, coupled to the input voltage VIN and to the control block, and optionally coupled to one of VOUT or the voltage node VX, and configured to detect a voltage drop in the input voltage VIN and generate a control signal to the control block to disable operation of the converter circuit, wherein the VIN detection block includes:
(1) a PMOS FET having a gate coupled to the voltage input VIN, a source, and a drain;
(2) a resistor coupled between the voltage input VIN and the source of the PMOS FET;
(3) a capacitor coupled between the source of the PMOS FET and a reference voltage;
(4) an inverter coupled to the drain of the PMOS FET; and
(5) a threshold voltage adjustment circuit coupled to the drain of the PMOS FET;, wherein the PMOS FET causes the inverter to generate the control signal if a voltage applied to the gate of the PMOS FET from the voltage input VIN has a voltage drop relative to a voltage across the capacitor.