Comprehensive protection circuit for active power filter (APF)

The invention discloses and provides a comprehensive protection circuit for an active power filter (APF), and the comprehensive protection circuit is simple, stable, low in cost and easy to achieve. The comprehensive protection circuit comprises a feedback signal receiving circuit (1), an intelligent control circuit (2), a comprehensive arithmetic circuit (3), a failure indicating circuit (4) and an equipment off-network circuit (5), wherein the feedback signal receiving circuit (1) comprises a temperature detection circuit (11) and a feedback signal circuit (12); the temperature detection circuit (11) comprises a temperature arithmetic circuit (111) of A, B, C and N paths, a reference circuit (112) and a temperature control comprehensive circuit (113); the comprehensive arithmetic circuit is used for carrying out comprehensive arithmetic treatment on signals after being treated by the feedback signal receiving circuit and then correspondingly putting the signals into the intelligent control circuit, the fail