Drive device for semiconductor element

1. A drive device to drive a semiconductor element comprising:

an identification signal generating circuit generating an identification signal depending on a type of an input error signal;

a protection operation signal generating circuit generating a protection operation signal, wherein the protection operation signal has a pulse width equal to that of one of the error signal and the identification signal, based on which has a longer pulse width;

an other-phase identification signal terminal inputting an identification signal from an other-phase drive device or outputting the identification signal to the other-phase drive device;

a other-phase protection operation signal terminal inputting a protection operation signal from the other-phase drive device or outputting the protection operation signal to the other-phase drive device; and

a protection circuit performing an error protection operation depending on the protection operation signal generated by the protection operation signal generating circuit and the other-phase protection operation signal input through the protection operation signal terminal.

2. The drive device of claim 1 , wherein when a second error signal is input while a protection operation signal corresponding to a first error signal previously input is outputting, the identification signal generating circuit does not generate the identification signal corresponding to the second error signal.

3. The drive device of claim 1 , further comprising an other-phase identification signal preferential circuit which does not allow the identification signal to output from the identification signal terminal when the other-phase identification signal is input through the identification signal terminal.

4. The drive device of claim 1 , wherein the identification signal has a pulse width varying depending on the type of the error signal.

5. The drive device of claim 4 , wherein the identification signal generating circuit changes the pulse width of the identification signal depending on an output from a timer circuit, and

when the error signal is input, the timer circuit begins to electrically charge a capacitor, outputs a signal until a voltage of the capacitor reaches a threshold voltage thereby indicating a time taken to charge the capacitor, and selects a current value for electrically charging the capacitor depending on the type of error signal.

6. The drive device of claim 4 , wherein the identification signal generating circuit changes the pulse width of the identification signal depending on an output from a timer circuit, and

when the error signal is input, the timer circuit begins to electrically charge a capacitor, outputs a signal until a voltage of the capacitor reaches a threshold voltage thereby indicating a time taken to charge the capacitor, and selects the threshold voltage depending on the type of error signal.

7. The drive device of claim 4 , wherein the identification signal generating circuit changes the pulse width of the identification signal depending on an output from a timer circuit, and

when the error signal is input, the timer circuit frequency-divides a fundamental wave, and switches a frequency division ratio depending on the type of error signal.