Driver for switching element and control system for rotary machine using the same
First Claim
1. A driver for driving, in response to a drive signal, a voltage-controlled switching element having a conductive path, an on-off control terminal, and a sense terminal from which a sense signal correlated with an amount of current flowing through the conductive path is output, the driver comprising:
- a discharging module configured to discharge, at a predetermined discharging rate, the on-off control terminal of the voltage-controlled switching element for changing the voltage-controlled switching element from an on state to an off state in response to the drive signal being shifted from an on state to an off state;
a changing module configured to;
determine whether a condition for executing reduction of the discharging rate of the on-off control terminal of the voltage-controlled switching element is met, the condition including a level of the sense signal being higher than a threshold level during the on state of the drive signal; and
change the discharging rate of the on-off control terminal in response to the drive signal being shifted from the off state to the on state upon determination that the condition is met; and
a loosening module configured to loosen the condition after a lapse of a predetermined period since the shift of the drive signal from the off state to the on state in comparison to the condition immediately after the shift of the drive signal from the off state to the on state.
1 Assignment
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Accused Products
Abstract
In a driver, a discharging module discharges, at a discharging rate, the on-off control terminal of a switching element in response to a drive signal being shifted from an on state to an off state. A changing module determines whether a condition including a level of a sense signal being higher than a threshold level during the on state of the drive signal is met, and changes the discharging rate of the on-off control terminal in response to the drive signal being shifted from the off state to the on state upon determination that the condition is met. A loosening module loosens the condition after a lapse of a period since the shift of the drive signal from the off state to the on state in comparison to the condition immediately after the shift of the drive signal from the off state to the on state.
9 Citations
10 Claims
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1. A driver for driving, in response to a drive signal, a voltage-controlled switching element having a conductive path, an on-off control terminal, and a sense terminal from which a sense signal correlated with an amount of current flowing through the conductive path is output, the driver comprising:
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a discharging module configured to discharge, at a predetermined discharging rate, the on-off control terminal of the voltage-controlled switching element for changing the voltage-controlled switching element from an on state to an off state in response to the drive signal being shifted from an on state to an off state; a changing module configured to; determine whether a condition for executing reduction of the discharging rate of the on-off control terminal of the voltage-controlled switching element is met, the condition including a level of the sense signal being higher than a threshold level during the on state of the drive signal; and change the discharging rate of the on-off control terminal in response to the drive signal being shifted from the off state to the on state upon determination that the condition is met; and a loosening module configured to loosen the condition after a lapse of a predetermined period since the shift of the drive signal from the off state to the on state in comparison to the condition immediately after the shift of the drive signal from the off state to the on state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A driver for driving, in response to a drive signal, a voltage-controlled switching element having a conductive path, an on-off control terminal, and a sense terminal from which a sense signal correlated with an amount of current flowing through the conductive path is output, the driver comprising:
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a discharging module configured to discharge, at a predetermined discharging rate, the on-off control terminal of the voltage-controlled switching element for changing the voltage-controlled switching element from an on state to an off state in response to the drive signal being shifted from an on state to an off state; a determining module configured to determine whether a condition that a duration of a level of the sense signal being higher than a threshold level is equal to or longer than threshold time is met; a disabling module configured to disable the determining module from executing the determination until a predetermined period has elapsed since the shift of the drive signal from the off state to the on state; and a discharging-rate changing module configured to change the discharging rate of the on-off control terminal when it is determined by the determining module that the condition is met.
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10. A control system for controlling a rotary machine, the control system comprising:
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an inverter equipped with at least one pair of voltage-controlled switching elements connected in series, each of the voltage-controlled switching elements having a conductive path, an on-off control terminal, and a sense terminal from which a sense signal correlated with an amount of current flowing through the conductive path is output; and a driver for driving each of the voltage-controlled switching elements, the driver comprising; a discharging module configured to discharge, at a predetermined discharging rate, the on-off control terminal of a corresponding one of the voltage-controlled switching elements for changing a corresponding one of the voltage-controlled switching elements from an on state to an off state in response to the drive signal being shifted from an on state to an off state; a changing module configured to; determine whether a condition for executing reduction of the discharging rate of the on-off control terminal of a corresponding one of the voltage-controlled switching elements is met, the condition including a level of the sense signal being higher than a threshold level during the on state of the drive signal; and change the discharging rate of the on-off control terminal of a corresponding one of the voltage-controlled switching elements in response to the drive signal being shifted from the off state to the on state upon determination that the condition is met; and a loosening module configured to loosen the condition after the lapse of the predetermined period since the shift of the drive signal from the off state to the on state in comparison to the condition immediately after the shift of the drive signal from the off state to the on state.
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Specification