Transcript Slide 1 - CERN Indico

Design of new generation CLIQ units (CLIQ2)
TE-MPE-EE, 11-Jan-2017
J. Mourao TE-MPE-EE
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Topics
 CLIQ2 Power supply Electronic Design
– Overview
– 1000VDC capacitor charger
– Trigger signal generator circuit
– Thyristor driver
 User interface
 User Safety measures
 Trigger and discharge circuit redundancy
TE-MPE-EE, 11-Jan-2017
 Redundancy check circuit
 Conclusion
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Overview
Mains Input
Trigger Circuit
1000VDC
capacitor
charger
TE-MPE-EE, 11-Jan-2017
Current supplied in the
superconducting magnet
Capacitor Bank (non polarized) :
- 50[mF] charged at max. 1000V
- max. stored energy 25 [KJoule]
Discharge circuit
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1000VDC capacitor charger
 Currently being designed & manufactured by SDS Performance
TE-MPE-EE, 11-Jan-2017
 technical specification:
-
Boxed in a 3U/21TE Europe
cassette (220mm deep)
-
100[mA] charging current to
charge the 50[mF]capacitor
bank to 1000V in 8 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 100[V]
-
Rear connector (din41612, H15
Male):
Mains input 220 VAC
On/Off command
controlling the output
stage
2 digital outputs for(end
of charge, Ucap>Utrim)
Analog reading of Ucap
Front Panel:
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Trigger signal generator circuit
TE-MPE-EE, 11-Jan-2017
To trigger the Power supply, the
user as to release the 10VDC
that he was continuously
supplying
500[ms] pulse generator
12 [KHz] square
Wave
500ms positive 12Khz
pulse train
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Thyristor driver
Two thyristors assembled in a single box.
(ABB 5STB24N2800).
Gate current needed to fire the thyristors:
Current in the thyristor during the energy
deposit (in the load):
TE-MPE-EE, 11-Jan-2017
Superconducting
Magnet load
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User interface

TE-MPE-EE, 11-Jan-2017

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)
–
Cap pressure ok LEDs
–
+24V OK LEDs
–
Trigger signal input
•
Trigger input signal (10 VDC)
•
2 Trigger presence leds
–
“Start charge” push button
–
“Equipment Stop” Buton
Trigger input
Rear panel:
–
Mains input (Burndy VDE)
–
Power output ()
–
Signal outputs:
•
Capacitor voltage (1:100)
•
Discharge current
•
End of charge
•
Internal problem contact
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User safety measures
–
Separation switch (lockable with a padlock)
–
ON/OFF Switch which automatically goes off after a
power cut
–
Equipment stop button stop on the front panel of the unit
–
Interlock contact which opens when the capacitors
switching crate is accessed
Remark: an automatic capacitor discharge is initiated when mains is turned off or is disconnected
–
Internal capacitors discharge function:
•
Discharge Time constant = 20[s]
TE-MPE-EE, 11-Jan-2017
After 3 time constants Ucap< 5% of initial voltage.
In the worst case(initial Ucap 1000V)-> After 1 [min] Ucap< 50VDC
5 x 2[kohm]/ 800W Resistor
banks (4000 Watts total)
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TE-MPE-EE, 11-Jan-2017
Trigger and discharge circuit redundancy
-
Two 24 VDC powersuplies
-
Two trigger circuit generators(on the same board)
-
Two pulse transformers boards
-
Two pairs of thyristors

Redundancy check idea:

Use two 800A (cheap) coils to measure the presence of current in a pair of thyristors
The coils will saturate above 800A (we expect current in the order of 6000A)
But we will know if current passed in both branches
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Redundancy check circuit 1
CLIQ1 power supply discharge test
50 V discharge
CH1 (yellow): Iout measured by CLIQ internal TI
CH2 (blue): Iout measured by CT max80
CH3 (pink): Iout measured by Talema 800A (TI_1)
CH4 (green): Iopen wire measured by Talema 800A (TI_2)
Max current ~ 1400A on a 50V discharge
TE-MPE-EE, 11-Jan-2017
500V discharge
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Redundancy check circuit 2
CHA (red): Uout measured by Talema CT (through a 9.4ohm burden resistor)
CHB (blue): U after filter stage
TE-MPE-EE, 11-Jan-2017
50 V 80mF discharge
500 V 80mF discharge
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Redundancy check circuit 3
TE-MPE-EE, 11-Jan-2017
To be able to detect the failure of one of the 4 thyristors we may finaly use a circuit like this
one.
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Conclusion

Thank to a big team (Mathieu Favre, Samuel Deleage, Stavroula Balampekou, Boshidar Panev,…) the First CLIQ
2 unit will be ready in two weeks.

It will allows us to make discharge at 1000V and see how the current is shared between the two thyristor
branches.

Than we can define the best way for checking the redundancy state.
TE-MPE-EE, 11-Jan-2017
Thanks for you attention !
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