Drive circuit for drive target switch
AssigneeDenso Corporation
InventorAkifumi ARARAGI
Life of this patent
Estimating the term…
Abstract
In a drive circuit, a control switch is electrically connected between a negative voltage source and a reference voltage generator. A drive controller switches a discharge switch and a control switch from an off state to an on state to thereby supply a first negative output voltage to a main control terminal of a target switch. The drive controller switches the discharge switch and the control switch from the on state to the off state to thereby change the first negative output voltage to be supplied to the main control terminal of the target switch to a second negative voltage based on the reference voltage generated by the reference voltage generator. The second negative voltage is more positive than the first negative voltage.
Claims15
A drive circuit for turning on or off a target switch having a first main terminal, a second main terminal with a voltage, and a main control terminal, the drive circuit comprising:
- a negative power source configured to output a first negative voltage that is lower than the voltage at the second main terminal;
- a discharge switch electrically connected between the main control terminal and the negative voltage source;
- a reference voltage generator connected to the second main terminal and configured to generate, based on the voltage at the second main terminal, a reference voltage that is higher than the first negative output voltage of the negative power source and that is lower than the voltage at the second main terminal;
- a control switch electrically connected between the negative voltage source and the reference voltage generator;
- and
- a drive controller configured to:
- switch the discharge switch and the control switch from an off state to an on state to thereby supply the first negative output voltage to the main control terminal of the target switch;
- and
- switch the discharge switch and the control switch from the on state to the off state to thereby change the first negative output voltage to be supplied to the main control terminal of the target switch to a second negative voltage based on the reference voltage generated by the reference voltage generator, the second negative voltage being more positive than the first negative voltage.
Dependencies are inferred from the claim text.