Switching device, and solar power generation system and vehicle driving system using the same
View Patent ↗A series-parallel switch circuit is constituted by connecting, in parallel, multiple series switch circuits in which a first switch receiving electric current and a second switch outputting the electric current are connected in series. Middle points of the multiple series switch circuits are joined. When the series-parallel switch circuit is turned on, the second switches constituting the series-parallel switch circuit are turned on, and thereafter, the first switches constituting the series-parallel switch circuit are turned on.
1. A switching apparatus comprising:
an input terminal configured to receive current;
an output terminal configured to output the current;
a first switch including a first-first terminal, and a first-second terminal which is connected with the input terminal;
a second switch including a second-first terminal which is connected with the first-first terminal of the first switch, and a second-second terminal which is connected with the output terminal;
a third switch including a third-first terminal which is connected with the first-first terminal of the first switch, and a third-second terminal which is connected with the input terminal;
a fourth switch including a fourth-first terminal which is connected with the third-first terminal of the third switch, and a fourth-second terminal which is connected with the output terminal; and
a controller configured to turn on and off the first to fourth switches, wherein
the first switch has a higher maximum current rating than the second switch, the third switch, and the fourth switch,
the controller turns off the first to fourth switches,
in a state that the first to fourth switches are in an off state, the controller turns on the second switch and the fourth switch,
in a state that the second switch and the fourth switch are in an on state and the first and third switch are in an off state, the controller turns on the first switch, and
in a state that the first switch, the second switch and the fourth switch are in an on state and the third switch is in an off state, the controller turns on the third switch.
2. The switching apparatus according to claim 1 , wherein
in a state that the first to fourth switches are in an on state, the controller turns off the third switch,
in a state that the first switch, the second switch and the fourth switch are in an on state and the third switch is in an off state, the controller turns off the first switch,
in a state that the second switch and the fourth switch are in an on state and the first and third switch are in an off state, the controller turns off the second switch and the fourth switch.
3. The switching apparatus according to claim 1 , wherein
the first switch is a transistor having a trench gate structure, and
the second switch, the third switch, and the fourth switch each are a transistor having a planar gate structure.
4. The switching apparatus according to claim 1 , wherein
the first switch is a first Metal-Oxide-Semiconductor Field-Effect Transistor having a first body diode,
the second switch is a second Metal-Oxide-Semiconductor Field-Effect Transistor having a second body diode,
the third switch is a third Metal-Oxide-Semiconductor Field-Effect Transistor having a third body diode,
the fourth switch is a fourth Metal-Oxide-Semiconductor Field-Effect Transistor having a fourth body diode,
the first body diode and the second body diode are reversely connected with each other, and
the third body diode and the fourth body diode are reversely connected with each other.
5. The switching apparatus according to claim 1 , wherein the controller includes a gate driver.
6. A solar power generation system comprising:
a storage battery configured to discharge a first DC power;
a solar power generation module configured to generate a second DC power;
a DC-DC converter configured to convert the first DC power or the second DC power into a third DC power;
a DC-AC converter configured to convert the third DC power into an AC power; and
the switching apparatus according to claim 1 connected between the storage battery and the DC-DC converter.
7. A vehicle driving system comprising:
a storage battery configured to discharge a first DC power;
an AC-DC converter configured to convert an AC power supplied from a commercial system to a second DC power;
a DC-DC converter configured to convert the first DC power or the second DC power into a third DC power;
an inverter configured to generate a driving power from the third DC power to drive a motor; and
the switching apparatus according to claim 1 connected between the storage battery and the DC-DC converter.
8. A switching apparatus comprising:
an input terminal configured to receive current;
an output terminal configured to output the current;
a first switch including a first-first terminal, and a first-second terminal which is connected with the input terminal;
a second switch including a second-first terminal which is connected with the first-first terminal of the first switch, and a second-second terminal which is connected with the output terminal;
a third switch including a third-first terminal which is connected with the first-first terminal of the first switch, and a third-second terminal which is connected with the input terminal;
a fourth switch including a fourth-first terminal which is connected with the third-first terminal of the third switch, and a fourth-second terminal which is connected with the output terminal; and
a controller configured to turn on and off the first to fourth switches, wherein
the first switch has a higher maximum current rating than the second switch, the third switch, and the fourth switch,
the controller turns on the first to fourth switches,
in a state that the first to fourth switches are in an on state, the controller turns off the third switch,
in a state that the first switch, the second switch and the fourth switch are in an on state and the third switch is in an off state, the controller turns off the first switch, and
in a state that the second switch and the fourth switch are in an on state and the first and third switch are in an off state, the controller turns off the second switch and the fourth switch.
9. The switching apparatus according to claim 8 , wherein
the first switch is a transistor having a trench gate structure, and
the second switch, the third switch, and the fourth switch each are a transistor having a planar gate structure.
10. The switching apparatus according to claim 8 , wherein
the first switch is a first Metal-Oxide-Semiconductor Field-Effect Transistor having a first body diode,
the second switch is a second Metal-Oxide-Semiconductor Field-Effect Transistor having a second body diode,
the third switch is a third Metal-Oxide-Semiconductor Field-Effect Transistor having a third body diode,
the fourth switch s a fourth Metal-Oxide-Semiconductor Field-Effect Transistor having a fourth body diode,
the first body diode and the second body diode are reversely connected with each other, and
the third body diode and the fourth body diode are reversely connected with each other.
11. The switching apparatus according to claim 8 , wherein the controller includes a gate driver.
12. A solar power generation system comprising:
a storage battery configured to discharge a first DC power;
a solar power generation module configured to generate a second DC power;
a DC-DC converter configured to convert the first DC power or the second DC power into a third DC power;
a power conditioner configured to convert the third DC power into an AC power; and
the switching apparatus according to claim 8 connected between the storage battery and the DC-DC converter.
13. A vehicle driving system comprising:
a storage battery configured to discharge a first DC power;
an AC-DC converter configured to convert an AC power supplied from a commercial system to a second DC power;
a DC-DC converter configured to convert the first DC power or the second DC power into a third DC power;
an inverter configured to generate a driving power from the third DC power to drive a motor; and
the switching apparatus according to claim 8 connected between the storage battery and the DC-DC converter.