Power source control device, battery pack, and power source system
A power source system includes a first power source, a power generator, a first electrical load, a second electrical load, a second power source, and a charge/discharge switch provided between the second power source and the power generator. The charge/discharge switch is controlled into a closed state to electrically connect the power generator to the second power source, when an amount of charge of the second power source is less than a charge request threshold, the power generator is in a power generating state, and an amount of power generated by the power generator is equal to or more than a total power requirement as a total sum of respective amounts of power required by the second power source, the first electrical load, and the second electrical load.
1. A power source control device to be provided in a power source system, the power source system including:
a first power source;
a power generator;
a first electrical load electrically connected to each of the first power source and the power generator;
a second electrical load electrically connected to the power generator and brought into an OFF state when an amount of supplied power becomes less than a reset threshold;
a second power source electrically connected to each of the second electrical load and the power generator; and
a charge/discharge switch provided between the second power source and the power generator,
wherein, when an amount of charge of the second power source is less than a charge request threshold, the power generator is in a power generating state, and an amount of power generated by the power generator is equal to or more than a total power requirement as a total sum of respective amounts of power required by the second power source, the first electrical load, and the second electrical load, the charge/discharge switch is brought into a closed state to electrically connect the power generator to the second power source.
2. The power source control device according to claim 1 ,
wherein, when the amount of charge of the second power source is less than the charge request threshold, the power generator is in the power generating state, and the amount of power generated by the power generator is less than the total power requirement, the amount of power required by the first electrical load is reduced to reduce the total power requirement.
3. The power source control device according to claim 1 ,
wherein the second electrical load is electrically connected not only to the power generator, but also to the first power source, and
wherein, when an interruption of the power supply from the first power source is detected while the charge/discharge switch is in the closed state to electrically connect the power generator to the second power source, a request to increase the amount of power generated by the power generator is output to a power generation control unit which controls driving of the power generator.
4. A battery pack to be provided in a power source system, the power source system including:
a first power source;
a power generator;
a first electrical load electrically connected to each of the first power source and the power generator; and
a second electrical load electrically connected to the power generator and brought into an OFF state when an amount of supplied power becomes less than a reset threshold,
the battery pack comprising:
a second power source electrically connected to each of the second electrical load and the power generator;
a charge/discharge switch provided between the second power source and the power generator; and
a battery control unit configured to control the charge/discharge switch to be opened or closed,
wherein, when an amount of charge of the second power source is less than a charge request threshold, the power generator is in a power generating state, and an amount of power generated by the power generator is equal to or more than a total power requirement as a total sum of respective amounts of power required by the second power source, the first electrical load, and the second electrical load, the battery control unit controls the charge/discharge switch into a closed state to electrically connect the power generator to the second power source.
5. The battery pack according to claim 4 , further comprising:
a power supply switch provided between the second power source and the second electrical load,
wherein the battery control unit controls not only the charge/discharge switch, but also the power supply switch to be opened or closed, and
wherein the battery control unit controls the power supply switch to be opened or closed so as to control an electrical connection between the second power source and the second electrical load.
6. The battery pack according to claim 5 ,
wherein the charge/discharge switch and the power supply switch are connected in series,
wherein the second power source is electrically connected to the power generator through each of the charge/discharge switch and the power supply switch, and
wherein the second electrical load is electrically connected to a middle point between the charge/discharge switch and the power supply switch and electrically connected to the power generator through the charge/discharge switch.
7. The battery pack according to claim 4 ,
wherein the charge/discharge switch includes a plurality of the charge/discharge switches, and
wherein the plurality of charge/discharge switches are connected in parallel.
8. The battery pack according to claim 4 ,
wherein the power source system includes a higher-level control unit,
wherein the battery control unit and the higher-level control unit are included in a power source control device, and
wherein the battery control unit operates on the basis of a control instruction from the higher-level control unit.
9. A power source system, comprising;
a first power source;
a power generator;
a first electrical load electrically connected to each of the first power source and the power generator;
a second electrical load electrically connected to the power generator and brought into an OFF state when an amount of supplied power becomes less than a reset threshold;
a second power source electrically connected to each of the second electrical load and the power generator;
a charge/discharge switch provided between the second power source and the power generator; and
a power source control device configured to control the charge/discharge switch to be opened or closed,
wherein, when an amount of charge of the second power source is less than a charge request threshold, the power generator is in a power generating state, and an amount of power generated by the power generator is equal to or more than a total power requirement as a total sum of respective amounts of power required by the second power source, the first electrical load, and the second electrical load, the power source control device brings the charge/discharge switch into a closed state to electrically connect the power generator to the second power source.
10. The power source system according to claim 9 ,
wherein, when the amount of charge of the second power source is less than the charge request threshold, the power generator is in the power generating state, and the amount of power generated by the power generator is less than the total power requirement, the power source control device reduces the amount of power required by the first electrical load to reduce the total power requirement.
11. The power source system according to claim 9 , further comprising:
a limit switch provided between the power generator and the first electrical load,
wherein the power source control device controls not only the charge/discharge switch, but also the limit switch to be opened or closed.
12. The power source system according to claim 11 ,
wherein the first electrical load includes a plurality of the first electrical loads,
wherein the limit switch is provided between at least one of the plurality of first electrical loads and the power generator, and
wherein the power source control device restricts the amount of power required by the first electrical load connected to the power generator without interposition of the limit switch between the first electrical load and the power generator to reduce the amount of power required by the first electrical load.
13. The power source system according to claim 9 ,
wherein the second electrical load is electrically connected to a first middle point between the charge/discharge switch and the second power source, and
wherein the power generator is electrically connected to a second middle point between the second electrical load and the first middle point.
14. The power source system according to claim 9 ,
wherein the power source control device includes a battery control unit and a higher-level control unit electrically connected to the battery control unit, and
wherein the battery control unit operates on the basis of a control instruction from the higher-level control unit.
15. The power source system according to claim 14 ,
wherein the higher-level control unit outputs a control signal to the charge/discharge switch to control the charge/discharge switch to be opened or closed.
16. The power source system according to claim 9 , further comprising:
a first wire electrically connecting the first power source, the first electrical load, and the second electrical load to each other; and
a second wire electrically connected to the power generator,
wherein the first wire and the second wire are independent of each other.
17. The power source system according to claim 9 , further comprising:
a first wire electrically connecting the first power source, the first electrical load, and the second electrical load to each other; and
a second wire electrically connected to the power generator,
wherein the first wire includes the second wire.