Patent ID: 9728954
Date: 2017-08-08
CPC Classifications: B25J,H02H,H02J

Claim:
1. A protection circuit for a robot control device, the protection circuit comprising: a power-supply-voltage input terminal connected to an external power source; a first current cut-off unit that is connected to the power-supply-voltage input terminal and that cuts off a current input from the power-supply-voltage input terminal when a current value of the current exceeds a preset threshold; a second current cut-off unit that is provided at a subsequent stage of the first current cut-off unit and that cuts off a current output from the first current cut-off unit when a voltage value of a voltage applied from the power-supply-voltage input terminal exceeds a preset threshold; and a DC output terminal to which a DC current is output from the second current cut-off unit toward an object to be driven, wherein the second current cut-off unit includes: wherein the second switch includes: the second switch has a circuit configuration in which the second transistor is turned off in response to the first transistor being turned on.