Patent ID: 9608513
Date: 2017-03-28
CPC Classifications: H02M,Y02B,Y02P

Claim:
1. A method of improving load transient response in an inductor-inductor-capacitor (LLC) converter, said method comprising: providing a transformer that includes a primary side for receiving voltage output by a power factor correction (PFC) circuit, a secondary side for generating output voltage, and an isolation barrier that isolates the primary and secondary sides, the primary side including a resonant capacitor coupled thereto; coupling a current sensing circuit to the resonant capacitor on the primary side of the LLC converter; indirectly sensing, by the current sensing circuit, load current across the resonant capacitor on the primary side of the LLC converter; automatically transmitting, by the current sensing circuit, the sensed load current to a boost controller before output voltage of the LLC converter begins to sag upon sensing a change in the load current; and increasing, by the boost controller, a setpoint voltage for the PFC circuit output based solely on the indirectly sensed load current to operate the LLC converter at approximately a resonant frequency of the LLC converter.