ABSTRACT
This chapter introduces a three-element current source resonant inverter (CSRI):
Π
-CLL CSRI consists of three energy-storage elements CLL, the
Π
- CLL. A bipolar current source is employed in this circuit as described in the previous chapter and shown in Figure 2.7. Since there is no transformer and the circuit is not working in push-pull operation, the control circuit is very simple and power losses are low. This
Π
-CLL CSRI is shown in Figure 3.1. The energy source is a DC voltage
V
, which is chopped by two mains switches
S
and
S
. The three energy-storing elements are
C
,
L
and
L
. Two inductors can be different, i.e.,
L
=
p
L
with
p
as a random value. The load can be a coil, transformer or HF annealing equipment. A resistance
R
is assumed. Its equivalent circuit diagram is shown in Figure 3.2.
