| 摘要 |
An example controller (132) includes first (136), second (138) and third (134) inputs, a delayed ramp generator (142) and a drive signal generator (156). The first (136), second (138) and third (134) inputs are coupled to receive an input voltage sense signal (U RECT ), an output voltage sense signal (U OSENSE ), and an input current sense signal (U IN ), respectively. The drive signal generator (156) is coupled to receive an input charge control signal (U Q ) generated by an input charge control signal generator (148) and a delayed ramp signal (U DR ) generated by a delayed ramp generator (142). The input charge control signal (U Q ) is generated responsive to an integral of the input current sense signal multiplied by a ratio of the input voltage sense signal to the output voltage sense signal, where the drive signal generator (156) produces a drive signal responsive to the input charge control signal and the delayed ramp signal, the drive signal to be coupled to control a switch (118) of a power supply (100) to regulate an output of the power supply. |
