| 摘要 |
PROBLEM TO BE SOLVED: To prevent the breakage of not only the components of a chopper device but also other components by making the energy stored in a reactor to flow reversely through a regenerative diode which is broken for some reason when a fuse blows out due to an overcurrent. SOLUTION: In a protective device for regenerative chopper device, a diode DP is connected in parallel with a serial circuit of a reactor LCH and a regenerative diode DRCH and, when the diode DRCH is broken for some reason, an overcurrent flows and a fuse FU blows out. When the overcurrent flows, the energy stored in the reactor LCH is made to flow reversely through the broken diode DRCH and a newly provided diode DP. A diode having a small current capacity can be used as the diode DP, because no current flows to the diode DP during normal chopper control. Therefore, no overcharging of an input capacitor of a regenerative chopper occurs and the components of a converter, an inverter, etc., as well as the components of the chopper device are not broken. |
