Patent ID: 9598064
Date: 2017-03-21
CPC Classifications: B60T,F16D,H02P

Claim:
1. A brake drive control circuit comprising: semiconductor circuits configured to turn on/off drive signals to a brake which is provided at a servo motor, said semiconductor circuits connected in series with said brake; control devices configured to generate brake signals to independently turn on/off said semiconductor circuits, said control devices respectively connected to said semiconductor circuits; and a voltage detection circuit configured to detect a presence of a voltage applied to said brake, said voltage detection circuit connected in parallel to said brake, wherein said control devices are respectively provided with test pulse generating circuits configured to introduce test pulses into said brake signals, said test pulses configured to instantaneously turn off said semiconductor circuits, said control devices are configured to said test pulse generating circuits are configured to introduce said test pulses into said brake signals when disengaging said brake, said test pulses have no effect regarding a release of the brake, and said voltage detection circuit is configured to detect a malfunction of said semiconductor circuits by detecting an absence of a test pulse among said test pulses when disengaging said brake.