Power source conversion device, slow start circuit and power source control chip

The invention relates to a power source conversion device, a slow start circuit and a power source control chip. The power source conversion device includes a voltage conversion circuit, a switch control circuit, a start circuit, and a slow start circuit; the voltage conversion circuit is provided with a first side and a second side, wherein the first side receives a rectified voltage so as to generate an output voltage at the second side, and the first side is provided with a first side switch; the switch control circuit has a start state and a normal working state and supplies control signals to the control end of the first side switch; the start circuit supplies current to the control end when the switch control circuit is in the start state, so that the first side switch can be at least partially turned on; and the slow start circuit decreases the total quantity of the current supplied to the control end within second predetermined time after first predetermined time when the switch control circuit is in