Passive alternating current/direct current energized display circuit and method for explosion-proof frequency converter used in mines

The invention relates to the technical field of an explosion-proof frequency converter, and discloses a passive alternating current/direct current energized display circuit and method for an explosion-proof frequency converter used in mines. The passive alternating current/direct current energized display circuit adopted by the method comprises a passive alternating current energized display circuit, a passive direct current energized display circuit and a PCB; the passive alternating current energized display circuit on the PCB is connected with main loop incoming line three-phase alternating current power supplies R, S and T through A, B and C electrodes; and the passive direct current energized display circuit on the PCB is connected with the positive electrode and the negative electrode of a direct current bus through a positive electrode and a negative electrode. The adopted passive alternating current/direct current energized display circuit in the invention has the characteristics of small volume, wide indication voltage scope and high reliability.