Surgical robotic system and method for cart power switchover

A surgical robotic system comprising:

• a control tower including a DC power source;
• and
• a movable cart supporting a robotic arm having at least one of a camera or an instrument, wherein the movable cart includes a power delivery system including:
• a power input configured to receive a first DC electrical signal from the DC power source;
• a first voltage sense and control circuit coupled to the power input and operable in a primary power mode to output the first DC electrical signal;
• a battery configured to output a second DC electrical signal;
• a battery charging circuit configured to receive the first DC electrical signal and to charge the battery;
• a second voltage sense and control circuit coupled to the battery and operable in a battery power mode to output the second DC electrical signal;
• and
• a sharing circuit configured to output at least one of the first DC electrical signal from the first voltage sense and control circuit or the second DC electrical signal from the second voltage sense and control circuit to power the movable cart;
• and
• a cable detection circuit including:
• a detection signal source disposed at the control tower, the detection signal source configured to generate a detection signal;
• a first cable monitor disposed at the movable cart, the first cable monitor configured to monitor the detection signal;
• and
• a second cable monitor disposed at the control tower, the second cable monitor configured to monitor the detection signal returned from the movable cart, wherein the cable detection circuit is configured to determine cable disconnection based on at least one of the first cable monitor or the second cable monitor failing to receive the detection signal,
• wherein the sharing circuit is controlled to switch between the first DC electrical signal and the second DC electrical signal based on at least one of (i) detection of a cable disconnection or (ii) the state of charge of the battery.

A method for controlling power delivery to a surgical robotic movable cart, the method comprising:

• supplying a first DC electrical signal from a DC power source housed in a control tower to a power input of a movable cart;
• outputting the first DC electrical signal through a first voltage sense and control circuit operable in a primary power mode;
• receiving the first DC electrical signal at a battery charging circuit and charging a battery using the first DC electrical signal;
• supplying a second DC electrical signal from the battery;
• outputting the second DC electrical signal through a second voltage sense and control circuit operable in a battery power mode;
• outputting through a sharing circuit at least one of the first DC electrical signal from the first voltage sense and control circuit or the second DC electrical signal from the second voltage sense and control circuit to power the movable cart;
• and
• monitoring a connection of the power input to a cable at a cable detection circuit, including:
• generating a detection signal at a detection signal source disposed at the control tower;
• monitoring the detection signal at a first cable monitor disposed at the movable cart;
• monitoring the detection signal returned from the movable cart at a second cable monitor disposed at the control tower;
• determining, at the cable detection circuit, cable disconnection based on at least one of the first cable monitor or the second cable monitor failing to receive the detection signal;
• and
• switching from the primary power mode to the battery power mode in response to detection of a cable disconnection.