US 12,301,102 B2
Power factor correction
Isaac Cohen, Dix Hills, NY (US)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Mar. 30, 2022, as Appl. No. 17/709,141.
Prior Publication US 2023/0318446 A1, Oct. 5, 2023
Int. Cl. H02M 1/42 (2007.01); H02M 1/12 (2006.01); H02M 1/00 (2006.01)
CPC H02M 1/4225 (2013.01) [H02M 1/12 (2013.01); H02M 1/0009 (2021.05)] 17 Claims
OG exemplary drawing
 
1. A circuit, comprising:
a non-linear current sensor including:
a non-linear shunt including a capacitor connection terminal and a ground terminal,
wherein the non-linear shunt includes:
a first diode including:
a cathode coupled to the capacitor connection terminal; and
an anode coupled to the ground terminal; and
a second diode including:
an anode coupled to the capacitor connection terminal; and
a cathode coupled to the ground terminal;
a comparator including:
a first input coupled to the capacitor connection terminal;
a reference voltage input; and
a zero-crossing detector output configured to be coupled to a control circuit; and
a reference voltage circuit coupled to the reference voltage input; and
an inductor current estimation circuit, including:
a rectifier circuit including:
an AC power input; and
an output;
a resistor including:
a first terminal coupled to the output of the rectifier circuit; and
a second terminal configured to be coupled to the control circuit; and
a capacitor coupled in series with the resistor, the capacitor including:
a first terminal coupled to the second terminal of the resistor; and
a second terminal coupled to a ground terminal.