J Mourao TEMPEEE Topics CLIQ Power supply Electronic Design Overview C apacitor charger Trigger signal generator circuit T hyristor driver circuit Test of the trigger and discharge circuit ID: 563457
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Slide1
CLIQ Power supply design
J.
Mourao
TE-MPE-EESlide2
TopicsCLIQ Power supply Electronic Design
Overview
C
apacitor charger
Trigger signal generator circuit
T
hyristor
driver circuit
Test of the trigger and discharge circuit
User interface
User
Safety
Design & Production StatusSlide3
Overview
Mains
Input
Trigger Circuit
Discharge circuit
C
apacitor charger
Capacitor Bank (non polarized) :
40 or 80 [mF] charged at max. 500V
max. stored energy 10 [
KJoule
]
Current supplied in the superconducting magnetSlide4
Capacitor charger
Currently being designed &
manufactured
by
SDS Performance
technical specification:
Boxed in a 3U/10TE Europe cassette (220mm deep)
100[mA] charging current to charge the 80[mF]capacitor bank to 500V in 6.7 minutes
Front panel:2 LCDs (Ucap
, Icharge)
2 LEDs (end of charge, remaining capacitor Voltage > 40VDC)1 commutator to select Charging voltage by steps of 50[V]
Rear connector (din41612, H15 Male):Mains input 110/220 VACOn/Off command controlling the output stage 2 digital outputs for(end of charge, Ucap
>Utrim)Analog reading of Ucap
Front Panel:Slide5
Thyristor
driver
Two
thyristors
assembled in a single box. (ABB 5STB24N2800).
Gate current needed to fire the
thyristors
:
Superconducting Magnet load
Current in the
thyristor
during the energy deposit (in the load):Slide6
Trigger signal generator circuit
To trigger the Power supply, the user as to release the 10VDC that he was continuously supplying
5
00[
ms
] pulse generator
12 [KHz] square Wave
5
00ms positive 12Khz pulse trainSlide7
Resistive load 30 [ohms] to create a 8 A
rms
current in the
thyristors
Test of the trigger and discharge
circuit (1/2)
Use of mains to simulate the Oscillating effect of ta superconductive magnet load
A 100 [
ms
] pulse train triggers the two
thyristors
Two
Thyristor
used in the 13kA EE BCMs (ABB 5STF06D1220)Slide8
Test of the trigger and discharge circuit (2/2)
- When the current crosses the zero region, a high frequency noise is observed in a resistive load. Not annoying in our application!
- 13Khz pulse train
40[us] ON / 35[us] OFF
Max. gate current 2.4 [A]Slide9
User interface
Front panel:
LCD monitoring:
Ucap
,
Icap
(charge current)Led monitoring: Ucap>40V (RED),
END of charge(GREEN)Voltage setting: 0-500VDC by steps of 50 VDC (commutator)
“Start charge” push button
Rear panel:
Mains input (Burndy VDE)Power output (+ and - 400A connectors)Signal Inputs: Trigger input signal (10 VDC)
Signal outputs: Capacitor voltage (1:100)Discharge currentEnd of charge
Mains
Input
End of charge
Trigger input
Discharge
current
Power output
Capacitor voltage
“Start charge” push buttonSlide10
User safety
ON/OFF SWICH (goes in Off position in case of a power cut) (on the front panel)
Equipment stop
(on
the front
panel) for disconnecting the capacitor charger and empty the energy stored in the capacitors
Automatic capacitor discharge when mains is turned off/ disconnectedDischarge Time constant = 20[s]
After 3 time constants Ucap< 5% of initial voltage.
In the worst case(initial ucap 500V)-> After 1 [min] Ucap< 25VDC
247[ohm] / 1200W Resistor bank. To discharge the capacitors bank in 1 minSlide11
Design & production Status
Has
to be
completed in the design domain :
“Fine-tuning” of
the trigger circuit
(Bozhidar Panev)Add a function to inhibit the trigger input if these one stay at zero more than 500[
ms] (to avoid a continuous pulse train)Drawing of the PCBs (trigger board, discharge
board)Drawing a proper electrical schematic (with SI electrical) to detail the internal wiring of the rack and the 3U control chassis ( Yan Bastian’s help requested )Some components have still to be precisely defined:TI for the discharge current measurement (6000A pic) (Bo)Power switch for the two capacitances selection (Arend Dinus)
Circuit breaker, AC filter, ON-OFF switch…Production status:We have already at C
ern few components: Racks, CapacitorsWe ordered and will get in 3 weeks: the thyristors, the capacitor chargersAnd a lot of items have still to be ordered ( components, PCBs, mechanics, …)