lab_gruppen_c20-8x_c10-8x_c10-4x_c5-4x_sch.pdf

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Line Extension
Circuit description and schematics for
C 20:8X
C 10:8X
C 10:4X
C 5:4X
Some of the schematics included here are not complete, or up to date. They should be used for educational
purposes only.
INDEX
INDEX ....................................................................................................................................... 2
SP20F – Circuit description ....................................................................................................... 4
Functional overview............................................................................................................... 4
Block diagram ........................................................................................................................ 4
Soft Start................................................................................................................................. 5
Stand-by (Auxiliary) supply................................................................................................... 5
Mains Detector ....................................................................................................................... 5
PowerGood_AUX .................................................................................................................. 6
PowerOn................................................................................................................................. 6
PFC......................................................................................................................................... 6
Resonant converter................................................................................................................. 6
PowerGood_2kW ................................................................................................................... 7
Service tips ............................................................................................................................. 8
SP20F Schematics .................................................................................................................. 9
AICO4b – Circuit description .................................................................................................. 13
Power supplies and power up/down..................................................................................... 13
Stand-by supply................................................................................................................ 13
Start-up ............................................................................................................................. 13
Local supplies................................................................................................................... 13
FanControl........................................................................................................................ 14
Control Ports ........................................................................................................................ 14
GPI ................................................................................................................................... 14
GPO.................................................................................................................................. 14
NomadLink....................................................................................................................... 14
Controller operation ............................................................................................................. 15
Controller ......................................................................................................................... 15
Analogue measurements .................................................................................................. 15
Digital measurements ....................................................................................................... 16
FanControl........................................................................................................................ 16
Signal flow ........................................................................................................................... 16
Input circuitry................................................................................................................... 16
Analogue control and monitor.......................................................................................... 16
Limiters ................................................................................................................................ 17
Clip limiter ....................................................................................................................... 17
Current Limiter................................................................................................................. 17
Average Current Limiter .................................................................................................. 17
Protections............................................................................................................................ 18
Turn off channels ............................................................................................................. 18
Low Impedance ................................................................................................................ 18
Short circuit ...................................................................................................................... 18
VHF.................................................................................................................................. 18
DC-Protection................................................................................................................... 18
Temp Protection ............................................................................................................... 19
DIP-switches ........................................................................................................................ 19
Service tips ........................................................................................................................... 20
AICO4b Schematics (Partly)................................................................................................ 21
SPSMR – Circuit description ................................................................................................... 29
SPSMR - schematics ............................................................................................................ 29
Front Panel ............................................................................................................................... 30
A10D – Circuit description ...................................................................................................... 32
Power supplies and power up/down..................................................................................... 32
Supplies ............................................................................................................................ 32
Power up........................................................................................................................... 32
Signal Flow .......................................................................................................................... 33
Enable/Disable of a channel ................................................................................................. 34
Protections............................................................................................................................ 34
VHF.................................................................................................................................. 35
DC-Protection................................................................................................................... 35
Temp Protection ............................................................................................................... 35
Crowbar............................................................................................................................ 35
Limiters ................................................................................................................................ 35
Clip limiter ....................................................................................................................... 35
Service Tips.......................................................................................................................... 37
A10D Schematics (Partly).................................................................................................... 38
SP20F – Circuit description
Functional overview
The power supply SP20F is used in the C-Series line extension amplifiers. It incorporates:
•
Universal voltage input, 90-265 VAC
•
Power Factor Correction (PFC)
•
Soft start
•
Fast mains unplugged detector
•
A highly efficient isolated resonant converter for the high power outputs.
•
A standby supply also used for lower voltages.
Block diagram
Soft Start
[PFC] When the mains cord is plugged into the wall, the following will happen:
The rectified mains will through D5 start to charge the capacitor bank C22-C25. The soft start
circuitry will make the capacitor tank charge slowly with low inrush current. R33 is used as a
current sense resistor and Q7 and Q4 is used to slow down this event. The voltage over the
capacitor tank will rise slowly, and after about 1-2 seconds it will have completed it’s inrush
cycle and R33 is bypassed via Q5, thus shorting the entire soft start circuitry. The node that in
the schematics is named 400V, will be Vin * 1,41 (for 220v Mains it will be ~311V, for 110v
Mains it will be ~155v). The circuitry will remain in this state until the external “Power On”
is activated from the input board (PWR_ON_CTRL).
Stand-by (Auxiliary) supply
When the capacitor tank has reached about 80VDC the standby supply will try to start.
[AUXILIARY] This converter is a self oscillating type and will change frequency depending
on its load. The high voltage (>80VDC) is fed through R76 & R77 and D13 will make sure
that the SOPS_STARTUP has a constant voltage of 12v. When the supply operates this
voltage will be supplied from the winding through D16, thus relieving the stress on R76 &
R77. This voltage will make Q10 conduct, thus making Q15 and Q12 to conduct. Now,
current flows through the primary winding, building up a magnetic flux. The current will
increase linearly with the time and so will the voltage over R62 & R78 current sense resistors.
When the voltage is enough it will trigger Q14 to conduct, thus making Q11 to discharge C85
and Q12 gate. This will stop the current in the primary winding, and the voltage polarity on
all transformer windings will reverse to discharge the magnetic flux. Mainly the transformer
discharges the flux to the secondary side, building up the voltage over the secondary
capacitors. During this time the voltage on pin 2 on the transformer will be positive, and
through C35 and R89 it will keep Q10 from conducting. When the flux in the transformer has
been discharged, the entire event will start all over again. D7 taps out a primary voltage
12V_Aux to be used on the primary side. Normally when IC5 optocoupler is not conducting
current, the transformer is charged with a high amount of energy, transferring all the energy
the transformer can handle. When the output reaches the desired voltages D49 will start to
conduct, driving current through the IC5 diode. This will alter the sensitivity on the current
sense circuitry, and make Q14 trigger on a lower primary current, thus transferring less
energy. This regulation will make the primary side not to put in more energy into the
transformer than we take out of it, thus keeping steady output voltages. When current flows in
the diode of IC5, Q13 will start to conduct current, thus making Pwr_AUX, that goes beyond
this page, to be -12v.
Mains Detector
[TOP] the Mains Detector is made up by IC1 and its surrounding components. When the
mains go above 80VAC (~113VDC) the voltage on IC1 pin 4 will go above 6,2v (D2) thus
making pin 2 discharge C7 rapidly. This will make pin 6 go below its reference thus making
its output high. This will slowly charge C8 through R3 and when it reaches 6,2v pin 14 will
go high, and the ENA will be high, thus bypassing the soft start and enabling the power
supply to turn on. During this time pin 13 will be close to 12v. If the mains cord is unplugged,
pin 13 will immediately go low, thus making the diode in IC2 conduct current, and disable

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