Driver for switching element and control system for rotary machine using the same

摘要

In a driver, a clamping module executes a clamping task that clamps an on-off control terminal voltage to be equal to or lower than a clamp voltage for a predetermined time during charging of the on-off control terminal of the switching element. The clamp voltage is lower than an upper limit of the voltage at the on-off control terminal of the switching element. A measuring module measures a parameter value correlated with a sense current correlated with a current flowing between input and output terminals of the switching element. A limiting module discharges the on-off control terminal to limit flow of the current between the input and output terminals if the value of the parameter exceeds a threshold. A setting module variably sets a length of the predetermined time as a function of the parameter value during charging of the switching element's on-off control terminal.

主权项

1. A driver for driving a switching element having an input terminal, an output terminal, an on-off control terminal, and a sense terminal from which a sense current correlated with a current flowing between the input and output terminals is output, the driver comprising:
a charging module configured to charge the on-off control terminal of the switching element for turning on the switching element; a clamping module configured to execute a clamping task that clamps a voltage at the on-off control terminal to be equal to or lower than a predetermined voltage as a clamp voltage for predetermined time during the charge of the on-off control terminal of the switching element, the clamp voltage being lower than an upper limit of the voltage at the on-off control terminal of the switching element; a measuring module configured to measure a value of a parameter correlated with the sense current; a limiting module configured to discharge the on-off control terminal to limit flow of the current between the input and output terminals if the value of the parameter measured by the measuring module exceeds a threshold value; and a setting module configured to variably set a length of the predetermined time as a function of the value of the parameter measured by the measuring module during the charge of the on-off control terminal of the switching element.