Driver circuit for switch
AssigneeDenso Corporation
InventorTomotaka Suzuki
Life of this patent
Estimating the term…
Abstract
A driver circuit works to drive a first switch and a second switch connected in parallel to each other. The driver circuit includes first and second charge switches and first and second diodes to turn on only one(s) of the first and second switches selected as an on-target(s). The driver circuit includes first and second individual discharging paths connected to gates of the first and second switches, first and second discharge resistors, a shared discharge path, and a shared discharge resistor. This structure is capable of reducing a switching loss.
Claims11
A driver circuit for driving a plurality of switches connected in parallel to each other, the driver circuit comprising:
- a switch unit which works to turn on only a selected one or more of the switches;
- individual electrical paths, each of which is connected at a first end to a gate of one of the switches;
- individual resistors, each of which is arranged in one of the individual electrical paths;
- a shared electrical path which is connected to second ends of the individual electrical paths which are opposite sides of the individual resistors than to the first ends connected to the gates of the switches;
- a shared resistor which is mounted in the shared electrical path,
- wherein the individual electrical paths are provided as individual discharging paths,
- wherein the individual resistors are provided as individual discharge resistors,
- wherein the shared electrical path is provided as a shared discharge path which connects the second ends of the individual discharging paths which are on the opposite sides of the individual discharge resistors to the first ends connected to the gates and grounds to which charges at the gates are discharged,
- wherein a discharge switch is arranged in the shared discharge path, and
- wherein the switch unit includes charge switches, one for each of the switches, each of which connects the gate of a corresponding one of the switches and an electrical power source and blocking units, each of which is arranged in one of the individual discharging paths and permits a flow of electrical current in a first direction from the gate to the shared discharge path and blocks a flow of electrical current in a second direction opposite the first direction;
- and
- off-hold switches, one for each of the switches, each of which short-circuits between a portion of a corresponding one of the individual discharging paths which is closer to the gate than the blocking unit is and the ground.
A driver circuit for driving a plurality of switches connected in parallel to each other, the driver circuit comprising:
- a switch unit which works to turn on only a selected one or more of the switches;
- individual electrical paths, each of which is connected at a first end to a gate of one of the switches;
- individual resistors, each of which is arranged in one of the individual electrical paths;
- a shared electrical path which is connected to second ends of the individual electrical paths which are opposite sides of the individual resistors than to the first ends connected to the gates of the switches;
- and
- a shared resistor which is mounted in the shared electrical path,
- wherein each of the individual resistors has a resistance value smaller than that of the shared resistor.
Dependencies are inferred from the claim text.