IR047 Electronic Voltage & Frequency Regulator
rev.ind. 03
page 6 / 15
GENERAL DESCRIPTION
The Voltage & frequency regulator is composed as follows:
RF INPUT FILTER
– EMI filter.
INPUT SWITCH
– Input AC automatic switch. Mains protection.
INPUT RECTIFIER
– Bridge rectifier.
LIMIT-IN CIRCUIT
-
Limit-in board. It is used to provide soft charging of internal
capacitors (40 seconds) during start up procedure. (see “start-up procedure” section)
IGBT CONTROL UNIT (SINUSOIDAL INVERTER)
- The inverter electronic circuit has been planned
with pulse width modulation system (PWM) ; it provides control to drives IGBT power module and to
protect it against short circuit, overload etc. An output electronic feed-back is provided directly from
output due to reduce the transformer loss voltage insertion.
IGBT POWER MODULE
– It is composed by a power IGBT and its driver.
RF OUTPUT FILTER
– EMI filter.
OUTPUT AUTO-TRANSFORMER
– The output transformer translates the voltage from
IGBT (nominal 230Vac) into an higher voltage (about 270V). It is an auto-f transformer. It
is included only in 20 & 30A version. An output coil associated to IGBT module, provides
the perfect output sine wave
The transformer is not used in three phase input version.
CONTROL UNIT
– Provides acoustic and visive alarms and functioning situation. It also
control the 50/60Hz selector and external enable & 0-10V control input.
LCD DIGITAL DISPLAY
– Output voltage and current indication (this is not an
instrument).
OUTPUT SWITCH
– Output AC automatic switch. Output disconnection and protection
device.
