Signal synthesis detection circuit and converter

The invention discloses a signal synthesis detection circuit and a converter, and the circuit comprises a control chip, a feedback module and a synthesis circuit. The control chip is provided with atleast one detection pin; the feedback module is provided with a plurality of feedback ends, the feedback module receives a plurality of input signals and outputs corresponding feedback signals throughthe feedback ends, and the feedback ends are divided into feedback end combinations matched with the different detection pins; and the synthesis circuit is connected between the feedback end combination and the detection pin which are matched with each other, and the synthesis circuit receives a feedback signal of the feedback end combination, generates a synthesis signal and sends the synthesissignal to the detection pin. Compared with the prior art, synthesis of multiple feedback signals is achieved, an original AND gate chip is replaced, the circuit is simple, cost is saved, meanwhile, level conversion is achieved,