Patent ID: 11962234
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A circuit, comprising:
a first rectifier having a first rectifier input and a first rectifier output;
a bridge circuit coupled to the first rectifier output, wherein the bridge circuit has first, second, third, and fourth terminals, the first and second terminals are coupled to the first rectifier output, and the third and fourth terminals are adapted to be coupled to a primary winding of a transformer, wherein the bridge circuit includes:
first, second, third, and fourth transistors;
a pulse width modulation (PWM) controller having a PWM input, and at least one PWM output configurable to control inputs of the first, second, third, and fourth transistors; and
a current limit circuit having an input and an output, wherein the current limit circuit input is adapted to be coupled to at least one of the first, second, third, or fourth transistors, and the current limit circuit output is coupled to the PWM input; and

a second rectifier having a second rectifier input and a second rectifier output, wherein the second rectifier input is adapted to be coupled to a secondary winding of the transformer;
in which the PWM controller implements a repeating pattern, the repeating pattern including:
a first pattern portion in which the second and third transistors are on, and the first and fourth transistors are off;
a second pattern portion in which the first and second transistors are on, and the third and fourth transistors are off;
a third pattern portion in which the first and fourth transistors are on, and the second and third transistors are off; and
a fourth pattern portion in which the third and fourth transistors are on, and the first and second transistors are off.