Sampling hold and knee point detection circuit with adaptive pre-charging capability

The invention belongs to the technical field of power management, and particularly relates to a sampling hold and knee point detection circuit with self-adaptive pre-charging capability. According to the sampling hold and knee point detection circuit with the self-adaptive pre-charging capacity, in order to solve the problem that the charging time of a sampling capacitor is not enough within the small turn-off time, a transient enhancement circuit is additionally arranged in the circuit to pre-charge the sampling capacitor, voltage signals delayed through a buffer, a Cdelay and a Rdelay are converted into voltage signals, and the voltage signals are converted into voltage signals through the self-adaptive pre-charging capacity. And the second comparator is turned over by the voltage difference formed between the first signal and the original signal, so that the sampling capacitor Cdelay is pre-charged in the leading edge blanking stage, and the requirement of the sampling capacitor Cdelay on the charging time