Power supply control device, power supply control method, and computer program
A power supply control device controls power supply to a load through a power supply switch. A driving circuit switches on or off the power supply switch. When the driving circuit switches the power supply switch from off to on, a waveform value regarding the current waveform of a current that flows through the load is output by a waveform value detection unit to a microcomputer. The microcomputer determines power supply control conditions regarding control of power supply to the load based on the waveform value that is input from the waveform detection unit.
1. A power supply control device that controls power supply to a load via a switch, the power supply control device comprising:
a switching unit configured to switch on or off the switch; and
a determination unit configured to, if the switching unit switches the switch from off to on, determine power supply control conditions regarding control of power supply to the load, based on a waveform value regarding a current waveform of a current that flows through the load;
wherein the switching unit keeps the switch off for a certain time period after keeping the switch on for a certain time period, and
the determination unit determines the power supply control conditions based on a waveform value of the current waveform in a time period from when the switching unit starts to keep the switch on to when the switching unit ends keeping the switch off.
2. The power supply control device according to claim 1 , further comprising:
a connector that is disposed on a current path of the current that flows via the switch, and to which the load is detachably connected; and
a connection detection unit configured to detect a connection between the load and the connector,
wherein the switching unit switches the switch from off to on if the connection detection unit detects the connection.
3. The power supply control device according to claim 1 , wherein the switching unit switches off the switch when a current value of a current that flows through the load reaches a current threshold value or higher, and
the power supply control conditions include the current threshold value.
4. The power supply control device according to claim 1 , further comprising:
a voltage detection circuit configured to detect a voltage value of a voltage that is applied to the load; and
a correction unit configured to correct the waveform value based on the voltage value detected by the voltage detection circuit.
5. The power supply control device according to claim 1 , further comprising:
a temperature estimation unit configured to estimate an ambient temperature around the load; and
a second correction unit configured to correct the waveform value based on the ambient temperature estimated by the temperature estimation unit.
6. The power supply control device according to claim 1 , further comprising
a specifying unit configured to specify a type of the load based on the waveform value,
wherein the determination unit determines the power supply control conditions that are to be power supply control conditions corresponding to the type specified by the specifying unit.
7. A power supply control method comprising:
a step of switching on or off a switch;
a step of obtaining a waveform value regarding a current waveform of a current that flows through a load if the switch is switched from off to on; and
a step of determining power supply control conditions regarding control of power supply to the load based on the obtained waveform value;
a step of keeping the switch on for a certain time period; and
a step of keeping the switch off for a certain time period after keeping the switch on for a certain time period,
wherein the waveform value is obtained in a time period from when keeping the switch on is started to when keeping the switch off is ended.
8. A computer program comprising a non-transitory, machine-readable medium storing instructions which, when executed by at least one programmable processor, caused at least one programmable processor to perform operations comprising:
a step of instructing that a switch be turned on or off;
a step of obtaining a waveform value regarding a current waveform of a current that flows through a load if the switch is switched from off to on; and
a step of determining power supply control conditions regarding control of power supply to the load based on the obtained waveform value;
a step of keeping the switch on for a certain time period; and
a step of keeping the switch off for a certain time period after keeping the switch on for a certain time period,
wherein the waveform value is obtained in a time period from when keeping the switch on is started to when keeping the switch off is ended.
9. The power supply control device according to claim 2 , wherein the switching unit switches off the switch when a current value of a current that flows through the load reaches a current threshold value or higher, and
the power supply control conditions include the current threshold value.
10. The power supply control device according to claim 2 , further comprising:
a voltage detection circuit configured to detect a voltage value of a voltage that is applied to the load; and
a correction unit configured to correct the waveform value based on the voltage value detected by the voltage detection circuit.
11. The power supply control device according to claim 3 , further comprising:
a voltage detection circuit configured to detect a voltage value of a voltage that is applied to the load; and
a correction unit configured to correct the waveform value based on the voltage value detected by the voltage detection circuit.
12. The power supply control device according to claim 2 , further comprising:
a temperature estimation unit configured to estimate an ambient temperature around the load; and
a second correction unit configured to correct the waveform value based on the ambient temperature estimated by the temperature estimation unit.
13. The power supply control device according to claim 3 , further comprising:
a temperature estimation unit configured to estimate an ambient temperature around the load; and
a second correction unit configured to correct the waveform value based on the ambient temperature estimated by the temperature estimation unit.
14. The power supply control device according to claim 4 , further comprising:
a temperature estimation unit configured to estimate an ambient temperature around the load; and
a second correction unit configured to correct the waveform value based on the ambient temperature estimated by the temperature estimation unit.
15. The power supply control device according to claim 2 , further comprising
a specifying unit configured to specify a type of the load based on the waveform value,
wherein the determination unit determines the power supply control conditions that are to be power supply control conditions corresponding to the type specified by the specifying unit.
16. The power supply control device according to claim 3 , further comprising
a specifying unit configured to specify a type of the load based on the waveform value,
wherein the determination unit determines the power supply control conditions that are to be power supply control conditions corresponding to the type specified by the specifying unit.
17. The power supply control device according to claim 4 , further comprising
a specifying unit configured to specify a type of the load based on the waveform value,
wherein the determination unit determines the power supply control conditions that are to be power supply control conditions corresponding to the type specified by the specifying unit.
18. The power supply control device according to claim 5 , further comprising
a specifying unit configured to specify a type of the load based on the waveform value,
wherein the determination unit determines the power supply control conditions that are to be power supply control conditions corresponding to the type specified by the specifying unit.