06-09-2012, 03:39 PM
ELECTRIC WINDOW/FENCE CHARGER
[attachment=33545]
Here is the circuit of a simple
electric window charger.
With a couple of minor circuit
variations, it can be used as an electric
fence charger too. A standard 12V, 7Ah
sealed maintenance-free (SMF) UPS
battery is required for powering the
entire unit.
Any component layout and mounting
plan can be used. However,
try to keep the output terminals of
transformer X1 away from the circuit
board. Timer NE555 (IC1) is wired as
a free-running oscillator with narrow
negative pulse at the output pin 3. The
pulse frequency is determined by resis-
tors R2 and R3, preset VR1 and capacitor
C3. The amplitude of the output
pulse can be varied to some extent by
adjusting variable resistor VR1. You
can vary the frequency from 100 Hz
to 150 Hz.
X1 is a small, iron-core, step-down
transformer (230V AC primary to 12V,
1A secondary) that must be reverse
connected, i.e., the secondary winding
terminals of the transformer should
be connected between the emitter and
ground and the output taken across the
primary winding. Switch S1 is used for
power ‘on’/‘off’ and LED1 works as a
power-‘on’ indicator. LED2 is used to
indicate the pulse activity.
The output pulse from pin 3 of IC1
drives pnp transistor T1 into conduction
for the duration of the time period.
The collector of T1 is connected to the
base of driver transistor T2 through resistor
R5. When transistor T1 conducts,
T2 also conducts. When T2 conducts, a
high-current pulse flows through the
secondary winding of transformer X1
to generate a very high-voltage pulse
at the primary winding.
[attachment=33545]
Here is the circuit of a simple
electric window charger.
With a couple of minor circuit
variations, it can be used as an electric
fence charger too. A standard 12V, 7Ah
sealed maintenance-free (SMF) UPS
battery is required for powering the
entire unit.
Any component layout and mounting
plan can be used. However,
try to keep the output terminals of
transformer X1 away from the circuit
board. Timer NE555 (IC1) is wired as
a free-running oscillator with narrow
negative pulse at the output pin 3. The
pulse frequency is determined by resis-
tors R2 and R3, preset VR1 and capacitor
C3. The amplitude of the output
pulse can be varied to some extent by
adjusting variable resistor VR1. You
can vary the frequency from 100 Hz
to 150 Hz.
X1 is a small, iron-core, step-down
transformer (230V AC primary to 12V,
1A secondary) that must be reverse
connected, i.e., the secondary winding
terminals of the transformer should
be connected between the emitter and
ground and the output taken across the
primary winding. Switch S1 is used for
power ‘on’/‘off’ and LED1 works as a
power-‘on’ indicator. LED2 is used to
indicate the pulse activity.
The output pulse from pin 3 of IC1
drives pnp transistor T1 into conduction
for the duration of the time period.
The collector of T1 is connected to the
base of driver transistor T2 through resistor
R5. When transistor T1 conducts,
T2 also conducts. When T2 conducts, a
high-current pulse flows through the
secondary winding of transformer X1
to generate a very high-voltage pulse
at the primary winding.