Driving apparatus
A driving apparatus for driving a switching device is provided, the driving apparatus including: a high potential line; a high-potential-side switching control unit configured to perform switching as to whether to connect a control terminal of the switching device to the high potential line; a first resistor element located on a high-potential side and disposed in series with the high-potential-side switching control unit on a path from the control terminal of the switching device to the high potential line; a high-potential-side capacitor provided in parallel with the first resistor element on the path from the control terminal of the switching device to the high potential line; and a high-potential-side discharge control unit configured to control whether to discharge the high-potential-side capacitor.
1 . A driving apparatus for driving a switching device, the driving apparatus comprising:
a high potential line;
a high-potential-side switching control unit configured to perform switching as to whether to connect a control terminal of the switching device to the high potential line;
a first resistor element located on a high-potential side and disposed in series with the high-potential-side switching control unit on a path from the control terminal of the switching device to the high potential line;
a high-potential-side capacitor provided in parallel with the first resistor element on the path from the control terminal of the switching device to the high-potential-side switching control unit;
a high-potential-side discharge control unit configured to control whether to discharge the high-potential-side capacitor; and
a high-potential-side diode disposed between the control terminal of the switching device and the high-potential-side capacitor.
2 . The driving apparatus according to claim 1 , wherein
the high-potential-side discharge control unit is configured to discharge the high-potential-side capacitor with a condition that a control voltage on the control terminal of the switching device is equal to or higher than a plateau voltage.
3 . The driving apparatus according to claim 1 , wherein
the switching device is either device of a pair of switching devices operated in a complementary manner, and
the high-potential-side discharge control unit is configured to discharge the high-potential-side capacitor during a period from a completion of turning-on of the switching device to be driven to a start of next turning-off of the switching device.
4 . The driving apparatus according to claim 1 , wherein
the first resistor element is disposed between the control terminal of the switching device and the high-potential-side switching control unit, and
the high-potential-side capacitor is disposed in parallel with the first resistor element between the control terminal of the switching device and the high-potential-side switching control unit.
5 . The driving apparatus according to claim 2 , wherein
the first resistor element is disposed between the control terminal of the switching device and the high-potential-side switching control unit, and
the high-potential-side capacitor is disposed in parallel with the first resistor element between the control terminal of the switching device and the high-potential-side switching control unit.
6 . The driving apparatus according to claim 3 , wherein
the first resistor element is disposed between the control terminal of the switching device and the high-potential-side switching control unit, and
the high-potential-side capacitor is disposed in parallel with the first resistor element between the control terminal of the switching device and the high-potential-side switching control unit.
7 . The driving apparatus according to claim 1 , wherein
a capacitance of the high-potential-side capacitor is variable, and
the driving apparatus further comprises a capacitance control unit configured to control the capacitance of the high-potential-side capacitor.
8 . The driving apparatus according to claim 1 , further comprising:
a reference potential line having a lower potential than the high potential line;
a reference-potential-side switching control unit configured to perform switching as to whether to connect the control terminal of the switching device to the reference potential line;
a first resistor element located on a reference-potential side and disposed in series with the reference-potential-side switching control unit on a path from the control terminal of the switching device to the reference potential line;
a reference-potential-side capacitor provided, in parallel with the first resistor element located on the reference-potential side, on the path from the control terminal of the switching device to the reference potential line; and
a reference-potential-side discharge control unit configured to control whether to discharge the reference-potential-side capacitor.
9 . The driving apparatus according to claim 1 , wherein
at least one of the switching device or the high-potential-side discharge control unit is a wide bandgap semiconductor element containing at least one of silicon carbide, gallium nitride, gallium oxide, or diamond as a main material.
10 . The driving apparatus according to claim 1 , wherein
the high-potential-side discharge control unit is a transistor device, a photocoupler, a digital isolator, a mechanical relay, or a photodiode.
11 . A driving apparatus for driving a switching device, the driving comprising:
a high potential line;
a high-potential-side switching control unit configured to perform switching as to whether to connect a control terminal of the switching device to the high potential line;
a first resistor element located on a high-potential side and disposed in series with the high-potential-side switching control unit on a path from the control terminal of the switching device to the high potential line;
a high-potential-side capacitor provided in parallel with the first resistor element on the path from the control terminal of the switching device to the high-potential-side switching control unit;
a high-potential-side discharge control unit configured to control whether to discharge the high-potential-side capacitor; and
a high-potential-side diode disposed in parallel with the first resistor element between the control terminal of the switching device and the high-potential-side capacitor, wherein
the first resistor element is disposed between the control terminal of the switching device and the high-potential-side switching control unit.
12 . The driving apparatus according to claim 11 , wherein
the high-potential-side discharge control unit is a high-potential-side switch disposed between the high potential line and a connection point between the high-potential-side diode and the high-potential-side capacitor.
13 . The driving apparatus according to claim 12 , further comprising:
a second resistor element located on the high-potential side and disposed in series with the high-potential-side diode between the control terminal of the switching device and a connection point between the high-potential-side capacitor and the high-potential-side discharge control unit.
14 . The driving apparatus according to claim 12 , further comprising:
a third resistor element located on the high-potential side and disposed in series with the high-potential-side switch between the high potential line and the connection point between the high-potential-side capacitor and the high-potential-side switch.
15 . The driving apparatus according to claim 14 , wherein
a resistance value of the third resistor element is variable, and
the driving apparatus further comprises a resistance control unit configured to control the resistance value of the third resistor element.
16 . The driving apparatus according to claim 12 , further comprising:
a fourth resistor element located on the high-potential side and disposed in series with the high-potential-side capacitor between a connection point between the high-potential-side switching control unit and the first resistor element and a connection point between the high-potential-side diode and the high-potential-side discharge control unit.
17 . The driving apparatus according to claim 16 , wherein
a resistance value of the fourth resistor element is variable, and
the driving apparatus further comprises a resistance control unit configured to control the resistance value of the fourth resistor element.
18 . The driving apparatus according to claim 13 , wherein
a resistance value of the second resistor element is variable, and
the driving apparatus further comprises a resistance control unit configured to control the resistance value of the second resistor element.
19 . The driving apparatus according to claim 13 , further comprising:
a third resistor element located on the high-potential side and disposed in series with the high-potential-side switch between the high potential line and the connection point between the high-potential-side capacitor and the high-potential-side switch.
20 . The driving apparatus according to claim 13 , further comprising:
a fourth resistor element located on the high-potential side and disposed in series with the high-potential-side capacitor between a connection point between the high-potential-side switching control unit and the first resistor element and a connection point between the high-potential-side diode and the high-potential-side switch.
21 . A driving apparatus for driving a switching device, the driving apparatus comprising:
a high potential line;
a high-potential-side switching control unit configured to perform switching as to whether to connect a control terminal of the switching device to the high potential line;
a first resistor element located on a high-potential side and disposed in series with the high-potential-side switching control unit on a path from the control terminal of the switching device to the high potential line;
a high-potential-side capacitor provided in parallel with the first resistor element on the path from the control terminal of the switching device to the high-potential-side switching control unit; and
a high-potential-side discharge control unit configured to control whether to discharge the high-potential-side capacitor, wherein
the high-potential-side switching control unit is provided between one electrode of the high-potential-side capacitor and the high potential line, and
the high-potential-side discharge control unit is provided in parallel with the high-potential-side switching control unit and provided between another electrode of the high-potential-side capacitor and the high potential line.