K
kell
- Jan 1, 1970
- 0
I tried firing a car ignition coil by connecting
a 400 volt transistor in cascode, like this:
+12 v
|
|
+--+-------+
| |
| |
10R )
| ignition)
| coil )
| )
| _______)
| c/
+--| MJE13009
e\
|
|
points
|
|
gnd
but it blew out the transistor after a few cycles.
I have fired ignition coils using igbt's and mosfets
(although not in cascode)
with similar voltage ratings to the MJE13009 and nothing
ever went wrong.
Recently I also tried the MJE5852,
which is a 400 volt pnp transistor, in the following configuration,
and didn't have any problem
+12 v
|
|
)
ignition)
coil )
)
)
|
|
e/
+----| MJE5852
| c\
| |
points |
| |
| |
+---+--+
|
|
gnd
Did I get a bad MJE13009 or is there something wrong with
the arrangement in the top diagram?
a 400 volt transistor in cascode, like this:
+12 v
|
|
+--+-------+
| |
| |
10R )
| ignition)
| coil )
| )
| _______)
| c/
+--| MJE13009
e\
|
|
points
|
|
gnd
but it blew out the transistor after a few cycles.
I have fired ignition coils using igbt's and mosfets
(although not in cascode)
with similar voltage ratings to the MJE13009 and nothing
ever went wrong.
Recently I also tried the MJE5852,
which is a 400 volt pnp transistor, in the following configuration,
and didn't have any problem
+12 v
|
|
)
ignition)
coil )
)
)
|
|
e/
+----| MJE5852
| c\
| |
points |
| |
| |
+---+--+
|
|
gnd
Did I get a bad MJE13009 or is there something wrong with
the arrangement in the top diagram?