VACS:Projects:Hardware:LPS:PowerSupply
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− | [[Image:lps_supply_placement.png|thumb|384px|left|LPS Power Supply PCB Placement]] The LPS power supply placement board is 102mm x 80mm wide on a single sided 35um board. | + | [[Image:lps_supply_placement.png|thumb|384px|left|LPS Power Supply PCB Placement]] The LPS power supply placement board is 102mm x 80mm wide on a single sided 35um copper board. |
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Revision as of 07:32, 21 January 2007
Contents |
Description
The power supply controllers and the master power supply board need themselves a power supply. To drive the output power supply transistors a specific power supply is used. By doing this it decouples the interactions of the power supply loads on the voltage regulator.
LPS Power Supply
Positive Power Supplies
- Positive Rectifier Board
- The positive rectifier board needs a power supply for the AOP that measure the output currents. These AOP need a +24V and a -5V supply to ensure that the output can vary between 0 and +5V (while the inputs can reach 10/15V).
- Positive Power Supply Controller
- The controller contains an ATMega8 controller, several AOP and a voltage reference. The AOPs need a +9V and -5V supplies as their outputs need only be in the 0..+5V range. The voltage reference generates a +5.000V from the +9V. The board must also drive the two relays which are in the rectifier board. The relays are driven by +5V and -5V (dV = 10V).
- Positive Voltage Regulator
- The voltage regulator drives the output power transistors using several AOPs. The AOPs must be capable of having an output in the range 0..+20V. For this they need a +24V and a -5V supply.
Negative Power Supplies
- Negative Rectifier Board
- The negative rectifier board is similar to the positive rectifier board but the AOPs need a -24V and a +9V supply. The AOPs outputs are in the 0..+5V range and the inputs may be as low as -10/-15V.
- Negative Power Supply Controller
- This is similar to the positive power supply controller.
- Negative Voltage Regulator
- The voltage regulator drives the output power transistors using several AOPs. The AOP must have the outputs that vary between 0 and -20V. They need a -24V and a +9V supply.
Master Controller
- LPS Master Controller
- The master controller contains the ATmega8 controller, drives the LCD panel, a relay and the fans. The relay and fans are connected to the +5V and -5V.
The power supply controllers and the master power supply board need themselves a power supply. A positive power supply controller uses the following supplies:
LPS Power Supply Regulation
To obtain the LPS power supplies we use the toric transformer of the positive power supply. The +24V and -24V are obtained by a voltage multiplier from the 2x9V toric transformers. In theory it can reach 36V so the decoupling capacitor is chosen to support at least 50V.
LPS Power Supply Summary
+24V | +9V | +5V | -5V | -24V | |
Positive Power Supply Rectifier | x | x | |||
Negative Power Supply Rectifier | x | x | x | ||
Positive Voltage Regulator | X | X | |||
Negative Voltage Regulator | X | X | |||
Positive Power Supply Controller | R | X | X | X | |
Negative Power Supply Controller | X | X | X | R | |
LPS Master Controller | X | X | |||
LPS LCD Panel | x | x |
- X
- The supply voltage is used by the board.
- x
- The supply voltage is used but passed throught a specific connector.
- R
- The supply voltage is not used but necessary (it is relayed to another board).
+24 | Positive Power Supply Rectifier | Analog | 10mA | Analog power supply for operational amplifiers. |
Positive Voltage Regulator | Analog | 20mA | ||
+9V | Negative Power Supply Rectifier | Analog | 10mA | |
Negative Voltage Regulator | Analog | 20mA | ||
Positive Power Supply Controller | Analog | 30mA | ||
Negative Power Supply Controller | Analog | 30mA | ||
+5V | Positive Power Supply Controller | Digital | 80mA | |
Negative Power Supply Controller | Digital | 80mA | ||
LPS Master Controller | Digital | 250mA | ||
LPS LCD Panel | Digital | 100mA | ||
-5V | Positive Power Supply Rectifier | Analog | 50mA | Used by the AOPs and the relays. |
Positive Power Supply Controller | Analog | 20mA | Used by 2 TL074 | |
Negative Power Supply Rectifier | Analog | 50mA | Used by the AOPs and the relays. | |
Negative Power Supply Controller | Analog | 50mA | ||
-24V | Negative Power Supply Rectifier | Analog | 20mA | |
Negative Power Supply Regulator | Analog | 20mA |
Schematics
PCB
The LPS power supply placement board is 102mm x 80mm wide on a single sided 35um copper board.
Signal class | Width | Clearance | Drill |
---|---|---|---|
Supply | 1.4mm | 0.3mm | 1mm |
GND | 1.8mm | 0.4mm | 1mm |
Supply24 | 1mm | 0.3mm | 1mm |
Signal and others | 0.8mm | 0.3mm | 0.8mm |