G - AA Electric
G - AA Electric
G - AA Electric
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Power supplies<br />
Power supplies<br />
H<br />
ConnectPower - Switched-mode power supply<br />
Switched-mode power supplies in the ConnectPower series<br />
are suitable for universal use, thanks to the varying voltage<br />
input range of 85 Vac to 265 Vac. The devices are interference-suppressed<br />
to DIN EN 55022 Class B and also satisfy<br />
the requirements for safety extra low voltages (SELV).<br />
Weidmuller’s switched-mode power supplies produce 12 W to<br />
300 W with electronic short-circuit control on the output side.<br />
The mains adapters can be used for industrial applications<br />
and in building automation.<br />
Principal of operation<br />
The outstanding features of primary switched-mode power<br />
supplies include high degree of efficiency combined with compact<br />
dimensions and moderate heat development. Mains voltage<br />
is rectified directly. The rectified voltage is then chopped at<br />
a higher frequency than the mains frequency. A transformer,<br />
which can be of small dimensions due to the high switching<br />
frequency, then transforms the voltage at the switching frequency<br />
to the required value.<br />
The voltage is then rectified and smoothed by a filter. Control<br />
is achieved by pulse-width modulation: the switch-on and<br />
switch-off times of the chopper-transformer are influenced in<br />
such a way as to ensure that the output voltage remains stable.<br />
Chopper<br />
Transformer<br />
Rectifier<br />
Current division and redundancy<br />
Weidmüller’s switched-mode power supplies can be connected<br />
in parallel to increase power or for redundancy purposes.<br />
There are two basic methods: active and passive current division.<br />
Active current division requires higher switching complexity.<br />
The advantage is exact current division and uniform load<br />
on the modules. Passive current division means less complex<br />
switching, lower costs, as well as a softer characteristic output<br />
curve and less exact division of the current. The output voltages<br />
of the units must be adjusted exactly (± 100-200 mV)<br />
before being connected in parallel.<br />
Power factor correction (PFC)<br />
Power factor correction ensures with switched-mode power<br />
supplies that there is a sinusoidal current input from the mains<br />
supply. A side effect is the regulation of the power factor to<br />
approximately 1.<br />
Filter<br />
Pulse generator<br />
Sold by <strong>AA</strong> <strong>Electric</strong> 1-800-237-8274 Lakeland, FL • Lawrenceville, GA • Greensboro, NC • East Rutherford, NJ www.A-Aelectric.com<br />
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