V8TR4 said:
Hello,
I want to make a controller for a golf cart motor and am considering using
paralleled MOSfets or HEXfets. I know that there can be problems with the
individual xsistors not sharing the load equally. Would it help if I had a
seperate line driving each one rather than hooking up to some common rail to
activate them? Any info would be much appreciated.
I am looking to control a PWM with a current up to 300ampere surge and
80ampere running.
Thanks
This may be of interest:
SCHÖNKNECHT AND DE DONCKER: PARALLEL CONNECTION OF SOFT-SWITCHING
HIGH-POWER HIGH-FREQUENCY INVERTERS
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 39, NO. 2,
MARCH/APRIL 2003
Abstract—Inductive heating applications like pipe welding or
steel strip annealing require electrical power ratings of several
megawatts at frequencies up to 100 kHz and higher. The large
power-frequency product represents a significant challenge for
today's semiconductor technology. As the absolute maximum
rating of a single-stage inverter is often far below rated power,
several inverters or several devices have to be connected in parallel.
This paper presents a novel topology, consisting of parallelconnected
soft-switching high-frequency inverters. Distinctive
features include flexible configurations, negligible shunt currents
between inverters, and equally shared power among inverters.
Furthermore, compared to a single-inverter system, no additional
reactive components are necessary for connecting inverters in
parallel and there is no need of a high-frequency transformer to
adapt the impedance of the load to the inverters.
A novel topology for connecting soft-switching inverters in
parallel is proposed in this paper. The following demands, which
often cause difficulties, have to be taken into consideration:
1) no or negligible circulating currents, even if inverters
switch nonsynchronous;
2) equal power sharing among parallel-connected inverters;
3) flexible variation of the number of parallel inverters, enabling
a wide power range and, thus, the possibility to
minimize the number of inverters for the given power;
4) no additional devices for connecting inverters in parallel;
5) minimization of losses in semiconductors by ZVS softswitching
operation at near zero-current.