Projector
Provided is a projector configured to modulate light from a light source unit and project image light, the projector including: a current measurement unit that measures a current supplied from a power supply, the current including at least a current supplied to the light source unit of the projector; and a controller that compares a measured current value measured by the current measurement unit with limit value information determined by user input or based on data stored in advance, and controls power output to the light source unit in accordance with a comparison result.
1 . A projector configured to project image light generated by modulating light from a light source unit, the projector comprising:
a current measurement unit configured to measure an alternating current supplied from a power supply to obtain a measured alternating current value, the current including at least a current to be supplied to the light source unit of the projector;
a controller configured to compare the measured alternating current value measured by the current measurement unit with limit value information determined by user input or based on data stored in advance, and to control power output to the light source unit in accordance with a comparison result of the measured alternating current value and the limit value information; and
a voltage measurement unit configured to measure a voltage supplied to the projector from the power supply to obtain a measured voltage value,
wherein the limit value information is a power threshold value, and
wherein the controller is further configured to calculate power of the projector from the measured alternating current value and the measured voltage value measured by the voltage measurement unit, and to compare the calculated power with the power threshold value, and then to control voltage output to the light source unit in accordance with a comparison result of the calculated power with the power threshold value.
2 . The projector according to claim 1 , wherein the limit value information is a current threshold value.
3 . The projector according to claim 1 , wherein the current measurement unit is configured to measure a current supplied from the power supply to a cooling unit of the projector.
4 . The projector according to claim 1 , wherein the controller is further configured to determine a power factor based on the measured alternating current value and the measured voltage value, and to calculate active power of the projector based on the power factor, the measured alternating current value, and the measured voltage value.
5 . The projector according to claim 1 , wherein the controller is further configured such that, after performing control to reduce power output to the light source unit, the controller does not perform control to increase the power output to the light source unit until a certain period elapses.
6 . The projector according to claim 1 , wherein the current measurement unit is further configured to measure a current effective value as the measured alternating current value by sampling a current waveform.
7 . The projector according to claim 1 , further comprising a light source controller configured to control power output to the light source,
wherein the controller is configured to instruct the light source controller to reduce power output when the measured alternating current value is larger than the limit value information, and
wherein the light source controller is configured to reduce an output power to the light source unit in accordance with the instruction from the controller.
8 . A projector configured to project image light generated by modulating light from a light source unit, the projector comprising:
a current measurement unit configured to measure an alternating current supplied from a power supply to obtain a measured alternating current value, the current including at least a current to be supplied to the light source unit of the projector;
a controller configured to compare the measured alternating current value measured by the current measurement unit with limit value information determined by user input or based on data stored in advance, and to control power output to the light source unit in accordance with a comparison result of the measured alternating current value and the limit value information;
a light source controller configured to control power output to the light source; and
a cooling controller configured to control power output to a cooling unit,
wherein the current measurement unit is configured to measure a current supplied from the power supply to a cooling unit of the projector,
wherein the controller is configured to instruct the light source controller and the cooling controller to respectively reduce power output when the measured alternating current value is larger than the limit value information,
wherein the light source controller is configured to reduce an output power to the light source unit in accordance with the instruction from the controller, and
wherein the cooling controller is configured to reduce an output power to the cooling unit in accordance with the instruction from the controller.
9 . The projector according to claim 1 , further comprising a power supply circuit configured to convert supplied AC power from the power supply into DC power and to output at least a part of the DC power to the light source unit.