Patent ID: 7751471

Claim:
A pulse width modulation asynchronous converter system with automatically switching pulse skipping mode, comprising: a pulse width modulation asynchronous converter, which is used to convert an input voltage to an output voltage by using pulse width modulation; a pulse generator, which is used to generate a pulse signal with a specific working period when said pulse width modulation asynchronous converter is in said pulse skipping mode; an error amplifier, which is used to amplify an error signal, and said error signal is an error between a feedback signal and a reference signal; a pulse width modulation generator, which is used to output a Pulse width modulation signal according to said error signal; and a pulse skipping mode switch module, which is used to detect an inductor current and decide to enable or disable said pulse skipping mode, and which comprises: an edge detector, which is used to detect said edge of said signal pulse; a latch, which is used to output a control signal; a continuous conduction mode detect module, which is used to detect whether the circuit is working in said continuous conduction mode; and an AND gate, which is used to compare said control signal in said latch and said pulse width modulation signal of said pulse width modulation generator.