Patent ID: 9627960
Date: 2017-04-18
CPC Classifications: A61B,G02B,H02J,H02M,H04N

Claim:
1. A load voltage control device, comprising: a load disposed in a tip portion of the load voltage control device; a power supply circuit disposed in a proximal end portion of the load voltage control device; a controller disposed in the proximal end portion of the load voltage control device; and a cable connecting the tip portion with the proximal end portion, the cable comprising a first power supply line and a second power supply line, both of which serve to transmit a power supply voltage to the load, the power supply circuit comprising at least one power supply that generates the power supply voltage and outputs the power supply voltage to the first power supply line and the second power supply line, wherein the controller operates to: obtain a voltage applied to the load based on a voltage applied to an input point of the first power supply line, a current flowing through the first power supply line, a voltage applied to an input point of the second power supply line and a current flowing through the second power supply line; and adjust the power supply voltage generated by the at least one power supply by controlling the at least one power supply so that the voltage applied to the load becomes substantially equal to a predetermined reference voltage, wherein the controller obtains the voltage applied to the load based on a following expression: where V