Driving device, light-emitting device, projection device, control method, and storage medium
A driving device includes: a power source circuit that converts inputted power to a constant voltage or constant current power, and outputs this converted power; a driver circuit that supplies the power outputted by the power source circuit to a load; and a control unit that receives the voltage or current of the power outputted by the power source circuit, calculates a value by multiplying a control gain by a difference of the detected value and a constant target value, and outputs a feedback signal based on this calculated value to the power source circuit, thereby performing feedback control on the power source circuit, the control unit raising the control gain when the voltage or current of the power outputted by the driver circuit is changed.
1. A driving device for driving a load, comprising:
a power source circuit that converts power inputted thereto to a power of a constant voltage or a constant current, and then outputs said power that has been converted;
a driver circuit that receives the power outputted by the power source circuit and outputs a power to the load; and
a control unit performing feedback control on the power source circuit, the control unit receiving a voltage or a current of the power outputted by the power source circuit as a detected value, and outputting to the power source circuit a feedback signal based on a value obtained by multiplying a difference of the detected value and a constant target value by a control gain,
wherein the control gain is increased when a voltage or a current of the power outputted from the driver circuit is to change.
2. The driving device according to claim 1 , wherein an amount by which the control gain is increased is determined on the basis of pulsation that occurs in the voltage or the current outputted by the power source circuit when the voltage or the current of power outputted by the driver circuit is to change.
3. The driving device according to claim 1 , wherein an amount by which the control gain is increased is determined on the basis of an amount of change in the voltage or the current outputted by the driver circuit when the voltage or the current of the power outputted by the driver circuit is to change.
4. The driving device according to claim 1 , wherein a period during which the control gain is increased is determined on the basis of pulsation that occurs in the voltage or the current outputted by the power source circuit when the voltage or the current of power outputted by the driver circuit is to change.
5. The driving device according to claim 1 , wherein a period during which the control gain is increased is determined on the basis of an amount of change in the voltage or the current outputted by the driver circuit when the voltage or the current of the power outputted by the driver circuit is to change.
6. The driving device according to claim 1 , further comprising:
a temperature detection unit that detects a temperature external to the driving device;
a cooling unit connected to an output unit of the power source circuit; and
a comparator that performs comparison of a temperature detected by the temperature detection unit to a prescribed threshold, and outputs a signal representing a result of said comparison to the control unit,
wherein the control unit controls the cooling unit to start or stop based on the signal outputted by the comparator, the control unit increasing the control gain when the cooling unit is to start or stop.
7. The driving device according to claim 1 ,
wherein the driver circuit converts the power outputted by the power circuit to a power of a constant voltage or a constant current, and supplies said power that has been converted to the load for at least prescribed periods, and
wherein the control unit performs feedback control on the driver circuit on the basis of the voltage or the current of power outputted by the driver circuit during said prescribed periods.
8. The driving device according to claim 1 ,
wherein the control unit controls a waveform of the voltage or the current of the power outputted by the driver circuit by performing feedback control on the driver circuit on the basis of the voltage or the current of the power outputted from the driver circuit such that the waveform is a pulse wave.
9. A light-emitting device, comprising:
the driving device according to claim 1 ; and
a light-emitting element as said load.
10. A projection device, comprising:
the light-emitting device according to claim 9 .
11. The driving device according to claim 1 , further comprising a storage medium that stores the control gain.
12. The driving device according to claim 11 , wherein an amount by which the control gain stored in the storage medium is increased is determined on the basis of pulsation that occurs in the voltage or the current outputted by the power source circuit when the voltage or the current of power outputted by the driver circuit is to change.
13. The driving device according to claim 11 , wherein an amount by which the control gain stored in the storage medium is increased is determined on the basis of an amount of change in the voltage or the current outputted by the driver circuit when the voltage or the current of the power outputted by the driver circuit is to change.
14. The driving device according to claim 11 , wherein a period during which the control gain stored in the storage medium is increased is determined on the basis of pulsation that occurs in the voltage or the current outputted by the power source circuit when the voltage or the current of power outputted by the driver circuit is to change.
15. The driving device according to claim 11 , wherein a period during which the control gain stored in the storage medium is increased is determined on the basis of an amount of change in the voltage or the current outputted by the driver circuit when the voltage or the current of the power outputted by the driver circuit is to change.
16. The driving device according to claim 11 , further comprising:
a temperature detection unit that detects a temperature external to the driving device;
a cooling unit connected to an output unit of the power source circuit; and
a comparator that performs comparison of a temperature detected by the temperature detection unit to a prescribed threshold, and outputs a signal representing a result of said comparison to the control unit,
wherein the control unit controls the cooling unit to start or stop based on the signal outputted by the comparator, the control unit increasing the control gain when the cooling unit is to start or stop.
17. A method of controlling a power source circuit that converts power inputted thereto to a constant power and outputs the power that has been converted, and a driver circuit that receives the power outputted by the power source circuit and outputs a power to a load, the method comprising:
performing feedback control on the power source circuit by receiving a voltage or a current of the power outputted by the power source circuit as a detected value, obtaining a value by multiplying a difference of the detected value and a constant target value by a control gain, and by outputting a feedback signal based on said value to the power source circuit; and
increasing the control gain when a voltage or a current of power outputted from the driver circuit is to change.
18. A non-transitory storage medium to be read by a control unit of a driving device, the driving device including:
a power source circuit that converts power inputted thereto to a power of a constant voltage or a constant current, and then outputs said power that has been converted;
a driver circuit that receives the power outputted by the power source circuit and outputs a power to the load; and
said control unit, the control unit performing feedback control on the power source circuit and feedback control on the driver circuit to control a voltage or a current of the power outputted by the driver circuit,
the storage medium storing a data array in which a plurality of data are arranged in chronological order, the plurality of data including a control gain to be used by the control unit such that when the storage medium is read by the control unit, the control unit successively reads in the control gain to perform said feedback control on the power source circuit by receiving the voltage or the current of the power outputted by the power source circuit as a detected value, obtaining a value by multiplying a difference of the detected value and a constant target value by the control gain retrieved from the storage medium, and outputting a feedback signal based on said value to the power source circuit,
wherein the control gain in the data array is set to a constant value except when the voltage or the current of the power outputted by the driver circuit is to change, the control gain being set to a value greater than the constant value when the voltage or the current of the power outputted by the driver circuit is to change.