Endoscope apparatus
An endoscope apparatus includes a power supply section configured to supply first power and second power to a load apparatus provided at a distal end portion of an insertion portion from an apparatus body, and a power supply control section configured to control the power supply section by instructing the power supply section to determine a first command signal based on a target voltage and a feedback voltage which is a voltage of the first power fed back from the distal end portion to the apparatus body so as to output the first power in accordance with the first command signal, and instructing the power supply section P to determine a second command signal based on the first command signal so as to output the second power in accordance with the second command signal.
1. An endoscope apparatus comprising:
a power supply configured to supply first power and second power to a load apparatus provided at a distal end portion of an insertion portion from an apparatus body; and
a controller configured to control the power supply by instructing the power supply to determine a first command signal based on a target voltage and a feedback voltage which is a voltage of the first power fed back from the distal end portion to the apparatus body so as to output the first power in accordance with the first command signal, and instructing the power supply to determine a second command signal based on the first command signal so as to output the second power in accordance with the second command signal;
wherein the controller is configured to output the target voltage, amplify the target voltage and a subtraction result of the feedback voltage by a predetermined amplification factor and determine the first command signal.
2. The endoscope apparatus according to claim 1 , further comprising:
a first power supply line;
a second power supply line; and
a feedback line, wherein
the first power supply line supplies the first power from the power supply to the load apparatus,
the second power supply line supplies the second power from the power supply to the load apparatus, and
the feedback line is connected to the first power supply line in the distal end portion and configured to cause the feedback voltage to be fed back.
3. The endoscope apparatus according to claim 2 , wherein the first power supply line, the second power supply line and the feedback line are inserted into the insertion portion.
4. The endoscope apparatus according to claim 1 , wherein the controller is configured to make a predetermined calculation of the first command signal and determine the second command signal.
5. The endoscope apparatus according to claim 1 , wherein the controller is configured to add a first adjustment signal to the first command signal and add a second adjustment signal to the second command signal.
6. The endoscope apparatus according to claim 1 , further comprising a grounding wire configured to output a grounding voltage in the distal end portion to the controller.
7. The endoscope apparatus according to claim 6 , wherein the controller determines the first command signal based on the target voltage and a result of subtracting the grounding voltage from the feedback voltage.
8. The endoscope apparatus according to claim 1 , wherein the load apparatus comprises an image pickup sensor.
9. The endoscope apparatus according to claim 8 , wherein the image pickup sensor is a CMOS image sensor.
10. The endoscope apparatus according to claim 6 , wherein the load apparatus comprises a thermistor.
11. The endoscope apparatus according to claim 1 , wherein the load apparatus comprises an acceleration sensor.
12. The endoscope apparatus according to claim 10 , wherein
the grounding wire is connected to the thermistor, and
the thermistor is configured to output a thermistor signal to the controller.
13. The endoscope apparatus according to claim 1 , wherein
the controller is further configured to make a predetermined calculation of the first command signal and determine the second command signal,
the apparatus body comprises:
a first current measurement circuit configured to measure a first drive current of the first power supply and output a measurement result to the controller; and
a second current measurement circuit configured to measure a second drive current of the second power supply and output a measurement result to the controller, and
the controller determines the second command signal based on the first command signal, the first drive current and the second drive current.
14. The endoscope apparatus according to claim 1 , wherein the controller is configured to detect operating mode information indicating an operating mode of the load apparatus and determine the second command signal based on the operating mode information and the first command signal.
15. An endoscope apparatus comprising:
a power supply configured to supply first power and second power to a load apparatus provided at a distal end portion of an insertion portion from an apparatus body; and
a controller configured to control the power supply by instructing the power supply to determine a first command signal based on a target voltage and a feedback voltage which is a voltage of the first power fed back from the distal end portion to the apparatus body so as to output the first power in accordance with the first command signal, instructing the power supply to determine a second command signal based on the first command signal so as to output the second power in accordance with the second command signal, and making a predetermined calculation of the first command signal and determining the second command signal,
wherein the apparatus body comprises:
a first current measurement circuit configured to measure a first drive current of the first power supply and output a measurement result to the controller; and
a second current measurement circuit configured to measure a second drive current of the second power supply and output a measurement result to the controller, and
the controller determines the second command signal based on the first command signal, the first drive current and the second drive current.
16. The endoscope apparatus according to claim 15 , further comprising:
a first power supply line;
a second power supply line; and
a feedback line, wherein
the first power supply line supplies the first power from the power supply to the load apparatus,
the second power supply line supplies the second power from the power supply to the load apparatus, and
the feedback line is connected to the first power supply line in the distal end portion and configured to cause the feedback voltage to be fed back.
17. The endoscope apparatus according to claim 15 , wherein the controller is configured to add a first adjustment signal to the first command signal and add a second adjustment signal to the second command signal.
18. The endoscope apparatus according to claim 15 , further comprising a grounding wire configured to output a grounding voltage in the distal end portion to the controller.
19. The endoscope apparatus according to claim 15 , wherein the controller is configured to detect operating mode information indicating an operating mode of the load apparatus and determine the second command signal based on the operating mode information and the first command signal.