2
1. Technical description.
1.1. General description.
The buffer power supply unit (PSU) is used for uninterrupted supply of devices requiring stabilised voltage
of
12V/DC.
A linear stabilising circuit used in the device supplies voltage of a lower noise level and a shorter time
of response for a noise than if a switching stabiliser is used. The PSU provides voltage
Uout= 11V÷13,8 V DC (Uout= 10,0V÷13,8 V DC – battery operation)
of current efficiency equal to
Imax=5A
to receivers
.
The PSU has two outputs that are independently protected by PTC fuses and monitored. In case of power
voltage decay, prompt switching to battery supply occurs.
The PSU has the following protections: short-circuit (SCP), overload (OLP), overheat (OHP) and
overvoltage (OVP). It is adapted for cooperation with the sealed lead-acid battery (SLA). The PSU controls
automatically the charging and maintenance process of the battery, moreover features the dynamic battery test
and excessive discharge protection (UVP). It has optical and acoustic operation signalling indicating the operation
state (supply, failure). Moreover, the PSU has technical outputs (BS, AW) used for remote operation control
(SSWiN, KD).
The PSU has a metal casing (RAL 9003 colour) with a space for 65Ah/12 battery. The casing features a
microswitch indicating door (front) opening and remowal from a wall.
1.2. Block diagram
Fig.1. The block diagram of the PSU.
