VACS:Projects:Hardware:LPS:PowerSupply

Revision as of 16:00, 30 November 2006

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

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).