Reflow oven

A reflow oven for processing a circuit board, wherein the reflow oven comprises:

• a heating zone, wherein the heating zone comprises a plurality of heating sub-zones, and the plurality of heating sub-zones are sequentially arranged in a length direction of the reflow oven;
• a plurality of heating devices, wherein the plurality of heating devices are arranged in corresponding heating sub-zones of the plurality of heating sub-zones, and each of the plurality of heating devices is configured such that a working temperature of the corresponding heating sub-zone is in a predetermined temperature interval;
• and
• a start-stop device configured to:
• activate or deactivate the plurality of heating devices such that a working temperature of each of the plurality of heating sub-zones is in a corresponding predetermined temperature interval;
• start counting time when a front end of the circuit board enters an inlet of the heating zone;
• and
• for each of the heating sub-zones, when the start-stop device reaches a cumulative counting time corresponding to the heating sub-zone, deactivate the heating devices of the heating sub-zone such that the plurality of heating devices of the heating sub-zone do not receive power to operate,
• wherein the plurality of heating devices comprise temperature control logic configured to control the plurality of heating devices to heat the respective zones based on comparing a detected zone temperature to the corresponding predetermined temperature interval and, when the start-stop device deactivates one of the plurality of heating devices based on the cumulative counting time, power to that heating device is deactivated and that heating device immediately stops heating at a time interval corresponding to the cumulative counting time and, while deactivated, does not heat the corresponding zone when the detected zone temperature is less than the corresponding predetermined temperature interval according to the temperature control logic of that heating device.