savvej
Member
I tried simulating the circuit using PSpice.But it showed no oscillating output.
The psipce library(eval.lib) had Q2N6059 power transistor which is rated 100V and 12A.Hence I decided to take input ac voltage source accordingly.
Rather than simulating the entire circuit ,I simulated only the RHS of the circuit.That I assumed that the voltage across 6.8u cap remains almost constant and hence I replaced it with a voltage source of 100V.
Also the lib had a zener of 4.7V.Hence I used it instead of 6.6V.
Also I agrued with myself that the circuit must oscillate without connecting the secondary.As when no load is connected ,it supplies only to the LED ,hence the current drawn is quite less and thus secondary coil effect can be ignored.I may be incorrect on this aspect.I took inductor values L1 and L2(as in previously posted schematic) both as 100u.
But still I tried simulating the circuit with the following assumptions.But I got constant output.
Here is the psipce code:
;
.lib eval.lib
r1 1 4 1Meg
r2 1 2 150k
r3 5 0 1.5
r4 4 7 470k
r5 7 8 15
;
c1 4 7 1n
c2 1 2 3.3n
c3 5 6 47u
;
d1 3 2 D1N4002
d2 6 8 D1N4002
;
x1 3 4 5 Q2N6059
;
dzener 6 4 D1N750
;
l1 1 9 100u
rl1 9 3 0.6
l2 5 8 100u
k1 l1 l2 1
;
v1 1 0 100
.tran 1u 10u
.probe
.end
The psipce library(eval.lib) had Q2N6059 power transistor which is rated 100V and 12A.Hence I decided to take input ac voltage source accordingly.
Rather than simulating the entire circuit ,I simulated only the RHS of the circuit.That I assumed that the voltage across 6.8u cap remains almost constant and hence I replaced it with a voltage source of 100V.
Also the lib had a zener of 4.7V.Hence I used it instead of 6.6V.
Also I agrued with myself that the circuit must oscillate without connecting the secondary.As when no load is connected ,it supplies only to the LED ,hence the current drawn is quite less and thus secondary coil effect can be ignored.I may be incorrect on this aspect.I took inductor values L1 and L2(as in previously posted schematic) both as 100u.
But still I tried simulating the circuit with the following assumptions.But I got constant output.
Here is the psipce code:
;
.lib eval.lib
r1 1 4 1Meg
r2 1 2 150k
r3 5 0 1.5
r4 4 7 470k
r5 7 8 15
;
c1 4 7 1n
c2 1 2 3.3n
c3 5 6 47u
;
d1 3 2 D1N4002
d2 6 8 D1N4002
;
x1 3 4 5 Q2N6059
;
dzener 6 4 D1N750
;
l1 1 9 100u
rl1 9 3 0.6
l2 5 8 100u
k1 l1 l2 1
;
v1 1 0 100
.tran 1u 10u
.probe
.end