MAGNET POWER SUPPLY SYSTEM 9100
55
DANFYSIK A/S - DENMARK.
This circuit consists of the integrated circuits U609, U611, U613 and U614.
4.3.11
Peltier Control
The temperature inside the temperature regulated area is regulated by Peltier control circuit.
The temperature difference ∆T from the defined constant temperature inside this area is
measured and generated a voltage to the CPUs ADC for monitoring.
This circuit consists of thermistor RT901, A901, A903, A904, U902 and U903.
4.4
EMC filter
An EMC filter provides three-phase filtering to attenuate conducted interferences at low and
high frequency noise generated from the switch mode power supply inside the magnet power
supply.
4.5
AC input filter module
The main function of this module is to filter noisy AC signals, overcurrent protecting and
rectify the AC signals to DC signals.
4.5.1
Overcurrent breaker
An overcurrent breaker Q1 functions as power switch for the power supply and fuse/
overcurrent breaker.
4.5.2
Rectifier 3 phase
The AC line rectifier is built with three one-phase rectifier D1, D3, D4 which functions as a
three-phase full-bridge rectifier rated for 35A.
4.5.3
Soft Start Module
The soft start module is build around PTC resistors R1, R2, R3 and R4. These limits the inrush
current that charges the capacitors.
When the control module signals “Relay_ON”, pin 1 on X2, the relay K2 switches witch
makes relay K1 to switch and thus the PTC resistors gets shorted.
4.5.4
Capacitor and DC link filter
The DC link filter consists of a choke L1 with choke L2 in parallel and a bulk electrolyte
capacitor bank C1, C2, C3, C4, C7, C8. The filter circuit is able to filter 300Hz as well as high
frequency noises.
