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Parametric Voltage Stabilizers

Understanding the Basics and Operation

Introduction to Voltage Stabilizers

  • Voltage stabilizers maintain a consistent output voltage even with fluctuations in input voltage
  • They are used in linear power supply circuits
  • Voltage stabilizers can also act as filters, reducing electrical noise
  • Instability is caused by variations in input voltage, load current, temperature drift, and aging of components

Classification of Voltage Stabilizers

  • Voltage stabilizers can be classified based on their stabilizing method
  • There are two main types: parametric stabilizers and compensating stabilizers
  • In this presentation, we will focus on parametric stabilizers
  • Parametric stabilizers utilize non-linear elements, such as stabilistors, for voltage regulation

Parametric Voltage Stabilizers

  • Parametric stabilizers use non-linear elements, like stabilistors, with a specific range of voltage dependence
  • Stabilistors have a steep region in their voltage-current characteristic
  • This steep region is the stabilization range where voltage remains almost constant
  • Main characteristics include stabilization voltage, minimum and maximum stabilization current, and dynamic resistance

Principle of Parametric Stabilization

  • An increase in input voltage leads to an increase in stabilistor current
  • However, the voltage across the stabilistor and load remains nearly constant
  • Excess voltage is dropped across the ballast resistor, dissipating the excess power
  • The voltage stabilization equation helps calculate the ballast resistor and stabilization coefficient

Calculation Example

  • Given: stabilization voltage = 5V, input voltage range = 10V to 11V
  • Find: ballast resistor and stabilization coefficient
  • Using the stabilization coefficient formula, calculate the coefficient
  • Then, use the coefficient to calculate the ballast resistor

Verification in Multisim

  • Use Multisim to validate the calculation results
  • Simulate the circuit for minimum and maximum input voltages
  • Measure the stabilistor current and output voltage
  • Compare the measured values with the calculated values

Discussion Questions

  • What is the purpose of a voltage stabilizer?
  • What are the main causes of voltage instability?
  • What is the formula for the stabilization coefficient?
  • How does a stabilistor differ from a diode?

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