Clippers and Clampers

transcript

Ajay Singh Raghuvanshi

Ajay Singh Raghuvanshi, IIITA 204/07/2023

CLIPPERS There are a variety of diode networks called

clippers that have the ability to “clip” off a portion of the input signal without distorting the remaining part of the alternating waveform.

Depending on the orientation of the diode, the positive or negative region of the input signal is “clipped” off.

CLIPPERS There are two general categories of

clippers: Series Clipper : The series configuration is

defined as one where the diode is in series with the load.

Parallel Clipper : The diode in a branch parallel to the load.

Series Clippers (Un-biased)The diode in a series clipper “clips” any voltage that does not forward bias it:•A reverse-biasing polarity•A forward-biasing polarity less than 0.7 V (for a silicon diode)

Biased Diode Series Clippers As in fig the direction of the diode suggests that

the signal vi must be positive to turn it on.

The dc supply further requires that the voltage v i be greater than V volts to turn the diode on.

Series Clippers When the diode is in the short-circuit state,

such as shown in Fig., the output voltage vo can be determined by applying Kirchhoff’s voltage law in the clockwise direction:

Series Clipper with voltage Source

Biased Series Clippers The negative region of the input signal is “pressuring” the diode into

the “off” state, supported further by the dc supply. In general, therefore, we can be quite sure that the diode is an

open circuit (“off” state) for the negative region of the input signal

Determine the o/p waveform

Summary of Series Clipper Circuits

Parallel Clipper

Determine the o/p

Parallel Clippers Forward Diode

Parallel Clippers Reversed Diode

Summary of Parallel Clipper Circuits

ClamperThe clamping network is one that will “clamp” a signal to a different dc level. The network must have a capacitor, a diode, and a resistive element, but it can also employ an independent dc supply to introduce an additional shift.

Biased Clamper Circuits

The input signal can be any type of waveform such as sine, square, and triangle waves.

The DC source lets you adjust the DC camping level.

2004/07/2023

Summary of Clamper Circuits

Ajay Singh Raghuvanshi, IIITA

Voltage-Multiplier Circuits

Voltage Doubler Voltage Tripler Voltage Quadrupler

Voltage multiplier circuits use a combination of diodes and capacitors to step up the output voltage of rectifier circuits.

VOLTAGE-MULTIPLIER CIRCUITS Voltage-multiplier circuits are employed to

maintain a relatively low transformer peak voltage while stepping up the peak output voltage to two, three, four, or more times the peak rectified voltage.

Voltage Doubler Half wave

Voltage Doubler Full wave

Voltage Tripler and Quadrupler

Practical Applications of Diode Rectifier Circuits

Conversions of AC to DC for DC operated circuits

Power supplies and Battery Charging Circuits Clipper , Clamper and Voltage multiplier

Wave shaping for signal analysis To get voltage transformation without use of

transformers Some other simple diode applications

Protective Circuits against Over current Protection against Polarity Reversal Protects against Currents caused by an inductive

kick in a relay circuit

Clippers and Clampers

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