The invention discloses a
brake power supply for a construction hoist and a control method. The
brake power supply comprises a 380V power supply, a switch S1, a switch S2, a rectification module, an IGBT switch Q1, an IGBT switch Q2, an IGBT switch Q3, an IGBT switch Q4 and a
diode, the 380V power supply is connected with the input end of the rectification module through the switch S1 and the switch S2, the output end + of the rectification module is connected with the drain
electrode of the IGBT switch Q1, and the source
electrode of the IGBT switch Q1 is connected with the
diode and the drain
electrode of the IGBT switch Q3. A design scheme different from a traditional
brake power supply is adopted, and controllable rectification
voltage reduction output
voltage is achieved by designing a novel power electronic topological structure; and secondly, an independent
chip is used for controlling and protecting the brake power supply, so that the stability and the safety of
brake control are improved. Particularly, in the aspect of
software control, stable and reliable direct-current output
voltage is realized by adopting a more accurate closed-
loop control mode.