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SWITCH -MODE POWER SUPPLIES AND SYSTEMS. Lecture No 2. Silesian University of Technology Faculty of Automatic Control, Electronics and Computer Sciences Ryszard Siurek Ph.D., El. Eng. Power supply status indications. Optical indication (usually different colour LEDs)

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switch mode power supplies and systems

SWITCH-MODE POWER SUPPLIES AND SYSTEMS

Lecture No 2

Silesian University of Technology

Faculty of Automatic Control, Electronics

and Computer Sciences

Ryszard Siurek Ph.D., El. Eng.

power supply status indications
Power supply status indications
  • Optical indication (usually different colour LEDs)

- green - normal operation

- red - failure (protection circuit activation)

- yellow - warning (e.g. mains voltage decay

and battery operation)

  • Contact indication (rely)

- contacts closed - normal operation

- contacts open - power failure

  • Power Fail Signal or PF

UOUT

DU

Dt > 1ms

DU < 5%Uo

t

PF

Dt

„1”

„0”

t

slide3

UOUT

DU

DU < 5%Uo

  • Power Good Signal

t

„1”

PG

„0”

t

output voltage hold up time
Output voltage hold-up time

UIN

t

95% Uo

UOUT

Uo

tp

t

tp – hold-up time (up to several ms)

power supply protection
Power Supply protection

Overcurrent protection

Constatnt current (CC) limiting

Power limiting

UOUT

constant current

power limiting

switch-off

ISC

IOUT

slide6

3. Output current fold-back

UOUT

nominal working point

resistive load

non-linear load

possible start-up operating point

ISC

IOUT

4. Power supply switch-off (fuses

5. Thermal protection

over voltage protection
Over-voltage protection

FS – feedback loop

(voltage regulation)

regulated voltage level 2

UOUT

UOUTmax

FS1

Uo

UOUT

FS2

switch-off

t

typical implementation

UM - voltage monitoring circuit

UM

UOUT

UOUT

switch-off

crowbar type overvoltage protection - activates overload or short-circuit protection circuit

power supply switching-off

power leads voltage drop compensation
Power leads voltage drop compensation

Is = 0

+S

Power Supply

rs

Io

DUs

Uo

U1

Ro

Uo

rs

DUs

-S

U1 = Uo + 2DUs

Feedback circuit controls voltage across +S & -S

parallel operation of power supplies
Parallel operation of power supplies

Increasing of the the total output power

I1, I2

Power Supply # 1

I1

U01

I0

Power Supply # 1

100% load

I2

U0

I1max

Power Supply #2

U02

I1

I2

I0

I1max

2I1max

~

U01 = U02

U01 > U02

I1max = I2max

Overload protection circuit with current (power) limitation is required

Parallel connection with non-balanced output currents

slide10

CS - current share

Power Supply # 1

U01

I1

CS

I0

I1, I2

additional connection

U0

I2

I1max

CS

U02

Power Supply # 2

I1

I2

I1max = I2max

I0

U01 > (<) U02 (may slightly differ)

I1max

2I1max

Power Supply # 1 (master) forces adequate changes of UO2 to keep I2 close to the actual value of I1

Parallel connection with current share facility (balanced output currents)

slide11

Paralleling of power supplies for redundancy

(output voltage security)

UIN1

D1

I1

Power Supply # 1

U01

I0

I2

I0<I1max, I2max

U0

UIN2

U02

Power Supply # 2

D2

~

U01 = U02

Redundancy 1 + 1

I1max = I2max

Redundancy n + x

-„n” modules necessary to supply load current

- „x” modules which can fail simultaneously