Switching Power Supply Tutorial.pdf

(11 KB) Pobierz

SWITCHING POWER SUPPLY TUTORIAL

Joseph A. Counsil - KBØFPD

7 August 2000

[Conventional Linear Pass-Transistor Supply]

I Q1

+ Vce -

Q1

Voltage

Reference

C

V UNREG

V REG

NOTE:

C=Large

Because

Frequency=low

(60 Hz or 120 Hz)

Power Dissipation Calculation Model:

P Q 1 =

V ce ´

I Q 1

For the conditions: V UNREG = 18 V; V REG = 14 V; I Q1 = 1 A

P Q 1 =

(18 V

-

14 V )

´

(1 A )

=

4 W

NOTES:

* An advantage of the pass-transistor supply is that it is simple in design,

and easy to repair. This is a reliable design due to its simplicity and small

number of parts.

* A disadvantage is that the unregulated voltage must not be very much

higher than the regulated output voltage, or the power dissipation in the pass

transistor becomes unacceptably large. This requires the use of a

transformer on the input to bring the line voltage down to a value relatively

close to the regulated output voltage. This design is therefore heavier and

dissipates more power.

787173092.220.png

787173092.231.png

787173092.242.png

787173092.253.png

787173092.001.png

787173092.012.png

787173092.023.png

787173092.033.png

787173092.044.png

787173092.055.png

787173092.066.png

787173092.077.png

787173092.088.png

787173092.099.png

787173092.110.png

787173092.121.png

787173092.132.png

787173092.143.png

787173092.154.png

787173092.165.png

787173092.176.png

787173092.187.png

787173092.188.png

787173092.189.png

787173092.190.png

787173092.191.png

787173092.192.png

787173092.193.png

787173092.194.png

787173092.195.png

787173092.196.png

787173092.197.png

787173092.198.png

787173092.199.png

787173092.200.png

787173092.201.png

787173092.202.png

787173092.203.png

787173092.204.png

787173092.205.png

787173092.206.png

787173092.207.png

787173092.208.png

787173092.209.png

787173092.210.png

787173092.211.png

787173092.212.png

787173092.213.png

787173092.214.png

787173092.215.png

787173092.216.png

787173092.217.png

787173092.218.png

787173092.219.png

787173092.221.png

787173092.222.png

787173092.223.png

787173092.224.png

787173092.225.png

787173092.226.png

787173092.227.png

787173092.228.png

787173092.229.png

787173092.230.png

787173092.232.png

787173092.233.png

787173092.234.png

787173092.235.png

787173092.236.png

787173092.237.png

787173092.238.png

787173092.239.png

787173092.240.png

787173092.241.png

787173092.243.png

787173092.244.png

787173092.245.png

787173092.246.png

787173092.247.png

787173092.248.png

787173092.249.png

787173092.250.png

787173092.251.png

787173092.252.png

787173092.254.png

787173092.255.png

787173092.256.png

787173092.257.png

787173092.258.png

787173092.259.png

787173092.260.png

787173092.261.png

787173092.262.png

787173092.263.png

787173092.002.png

787173092.003.png

787173092.004.png

787173092.005.png

787173092.006.png

787173092.007.png

787173092.008.png

787173092.009.png

787173092.010.png

787173092.011.png

787173092.013.png

787173092.014.png

787173092.015.png

787173092.016.png

787173092.017.png

787173092.018.png

787173092.019.png

787173092.020.png

787173092.021.png

787173092.022.png

787173092.024.png

787173092.025.png

[Switch-Mode Power Supply]

I Q1

+ Vce -

Q1

Feedback

Chopper

(Pulse Width

Modulated)

C

V UNREG

V REG

NOTE:

C=Small

Because

Frequency=high

(~30 KHz)

For the conditions: V UNREG = 18 V; V REG = 14 V; I Q1 = 1 A

Since Q1 is chopped...

Vce

18 V @ 0 A -- (Q1 cutoff, therefore no power dissipated),

or Vce

»

»

.5 V@ I Q1 (average) -- (Q1 saturated)

P Q 1 =

(.5 V )

´

(1 A )

=

.5 W

NOTES:

*Advantages are: 1) Runs cooler; 2) Is lighter due to no need for large

transformers or inductors; 3) The unregulated voltage can be much higher

than the regulated output voltage and the power dissipation still remains low.

This design will operate over a very wide input voltage range.

* A disadvantage of the switch-mode power supply is that due to the

chopper circuit, it might generate some RFI. This can be overcome by fully

enclosing it in a grounded case, and with good input and output RF filtering.

* Another disadvantage is that this design has a larger number of parts, thus

making it more complex to diagnose and repair problems, as well as having

a lower reliability.

787173092.026.png

787173092.027.png

787173092.028.png

787173092.029.png

787173092.030.png

787173092.031.png

787173092.032.png

787173092.034.png

787173092.035.png

787173092.036.png

787173092.037.png

787173092.038.png

787173092.039.png

787173092.040.png

787173092.041.png

787173092.042.png

787173092.043.png

787173092.045.png

787173092.046.png

787173092.047.png

787173092.048.png

787173092.049.png

787173092.050.png

787173092.051.png

787173092.052.png

787173092.053.png

787173092.054.png

787173092.056.png

787173092.057.png

787173092.058.png

787173092.059.png

787173092.060.png

787173092.061.png

787173092.062.png

787173092.063.png

787173092.064.png

787173092.065.png

787173092.067.png

787173092.068.png

787173092.069.png

787173092.070.png

787173092.071.png

787173092.072.png

787173092.073.png

787173092.074.png

787173092.075.png

787173092.076.png

787173092.078.png

787173092.079.png

787173092.080.png

787173092.081.png

787173092.082.png

787173092.083.png

787173092.084.png

787173092.085.png

787173092.086.png

787173092.087.png

787173092.089.png

787173092.090.png

787173092.091.png

787173092.092.png

787173092.093.png

787173092.094.png

787173092.095.png

787173092.096.png

787173092.097.png

787173092.098.png

787173092.100.png

787173092.101.png

787173092.102.png

787173092.103.png

787173092.104.png

787173092.105.png

787173092.106.png

787173092.107.png

787173092.108.png

787173092.109.png

787173092.111.png

787173092.112.png

787173092.113.png

787173092.114.png

787173092.115.png

787173092.116.png

787173092.117.png

787173092.118.png

787173092.119.png

787173092.120.png

787173092.122.png

787173092.123.png

787173092.124.png

787173092.125.png

787173092.126.png

787173092.127.png

787173092.128.png

787173092.129.png

787173092.130.png

787173092.131.png

787173092.133.png

787173092.134.png

787173092.135.png

787173092.136.png

787173092.137.png

787173092.138.png

787173092.139.png

787173092.140.png

787173092.141.png

787173092.142.png

787173092.144.png

787173092.145.png

787173092.146.png

787173092.147.png

787173092.148.png

787173092.149.png

787173092.150.png

787173092.151.png

787173092.152.png

787173092.153.png

787173092.155.png

787173092.156.png

787173092.157.png

787173092.158.png

787173092.159.png

787173092.160.png

787173092.161.png

787173092.162.png

787173092.163.png

787173092.164.png

787173092.166.png

787173092.167.png

787173092.168.png

787173092.169.png

787173092.170.png

787173092.171.png

787173092.172.png

787173092.173.png

787173092.174.png

787173092.175.png

787173092.177.png

787173092.178.png

787173092.179.png

787173092.180.png

787173092.181.png

787173092.182.png

787173092.183.png

787173092.184.png

787173092.185.png

787173092.186.png

Plik z chomika:

Inne pliki z tego folderu:

iwp300a2_fan.gif (7 KB)
A Novel Switch-Mode Dc-To-Ac Inverter With Non-Linear Robust Control.pdf (387 KB)
Layout guidlines for switching power supply.pdf (115 KB)
(ebook - electronics) - High Frequency Switching Power Supplies. Theory and Design (Chryssis 2nd ed. 1989).pdf (52655 KB)
(Ebook - Electronics) - Switch Mode Power Supply - Spellman.pdf (50447 KB)

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin