Amphenol Procom PRO-DAR8 Panduan Pengguna - Halaman 10
Jelajahi secara online atau unduh pdf Panduan Pengguna untuk Penerima Amphenol Procom PRO-DAR8. Amphenol Procom PRO-DAR8 15 halaman. 19” rack-mountable dual amplifier receiver multicoupler
Halaman Cetak6.4
Power supply
The PRO-DAR versions are provided with a power supply unit which supplies DC voltage
for the RF amplifier module.
The power supply unit both can operate with 230 or 115 VAC mains voltage and with 12 or
24 or 48 VDC, depending on model.
The AC mains voltage directly feeds a mains voltage winding on the mains transformer,
The DC voltage feeds a 50 Hz power multivibrator circuitry, which supplies a 50 Hz square
wave to a low voltage winding on the mains transformer.
Another low-voltage winding feeds AC voltage to a rectifier and voltage regulator circuitry.
The voltage regulator output supplies 12 VDC to the RF amplifier module.
As both the mains supply voltage and the DC supply voltage thus are fully galvanically
separated from the amplifier supply voltage by the mains transformer, unwanted ground
loops etc. are avoided.
6.4.1 Power supply Block Diagram
6.5
Power supply backup function
The power supply unit is provided with backup function.
If DC voltage (12, 24 or 48 VDC depending on model) from e.g., a rechargeable battery is
connected to the multicoupler together with AC mains voltage, the DC voltage source will
function as power backup.
If AC mains supply voltage is applied to the multicoupler, the relays are activated, and the
relay contact setting will connect mains voltage to the transformer and the DC supply
voltage input will be switched off.
The mains voltage thus has priority, and the multicoupler will operate on the mains voltage
if present, independent of DC voltage is connected or not.
If the mains voltage falls out, the relays are deactivated, and the contact setting will
disconnect the mains voltage input and connect DC supply voltage to the power
multivibrator, which then feeds low-voltage AC to a separate winding on the transformer,
and the multicoupler will continue to operate.
This automatic power switch-over function thus ensures an uninterrupted service of the
multicoupler, in case of mains power outage.
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