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Zenor Diode Diode Applications. ES230 Jack Ou. The Design of a Cell Phone Charger. c03f01. Still need to be filtered to get a DC voltage. Output of the transformer. c03f02. Short for Positive Voltages and Open for Negative Voltages. c03f03. Behavior of Ideal Diode. Ideal diode:

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c03f01

The Design of a Cell Phone Charger

c03f01

Still need to be filtered to

get a DC voltage

Output of the transformer

c03f02
c03f02

Short for Positive Voltages and

Open for Negative Voltages

c03f03
c03f03

Behavior of Ideal Diode

Ideal diode:

Vanode>Vcathode: Diode is on

Vanode<Vcathode: Diode is off

An ideal current experieincing Vanode=Vcathode, carries no current

c03f05
c03f05

I/V Characteristics

A short

An Open

A diode

Vanode>Vcathode: Diode is on

Vanode<Vcathode: Diode is off

An ideal current experieincing Vanode=Vcathode, carries no current

In practice, consider a slightly positive or negative voltage to

determine the response of a diode.

c03f07
c03f07

Example 1

c03f08
c03f08

Example 2: An OR Gate Realized By Diodes

c03f10
c03f10

A Simple Cell Phone Charger Circuit

(R1 is necessary)

Another Application:

Signal strength indicator

c03f11
c03f11

A Limiter Circuit

Question: How do you modify this circuit so that it passes only

Positive portion of the waveform?

c03f13
c03f13

Different Models of a Diode

choosing a diode model
Choosing a Diode Model

Use the ideal model to develop a quick, rough understanding of a circuit.

If the ideal model is not adequate, uses the constant voltage model, which is

sufficient for most cases.

Occasionally, we will use the exponential model

c03f14
c03f14

Ideal Model versus Constant-Voltage Model

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c03f15

Express ID1 and ID2 as a function of IS1, IS2 and Iin.