Average current control circuit and average current control method

The invention discloses an average current control circuit and an average current control method. In the circuit, one input terminal of an average current detection module is connected to a reference voltage signal output terminal of a band gap reference source, and another input terminal is connected to a source terminal of a power switch. A voltage transmission signal output terminal of the average current detection module is connected to an input terminal of a current regulator. Another input terminal of the current regulator is connected to the reference voltage signal output terminal of the band gap reference source, and an output terminal is connected to a negative input terminal of a comparator. An oblique wave generator input terminal is connected to the source terminal of the power switch, and an output terminal is connected to a positive input terminal of the comparator. An input terminal of a logic and driving circuit is connected to an output terminal of the comparator, another input terminal is connected to a switch starting pulse output terminal of an oscillator and an output terminal is connected to a grid terminal of the power switch. The source terminal of the power switch is connected to a grounding terminal via a detection resistor and a drain electrode is connected to a switch power supply module. Constant current precision is high, a current ripple wave is small and anti-noise performance is superior.