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Group No. – 9
Partha Pratik Mishra (13-1-4-027)
Saurabh Acharjee (13-1-4-028)
Sneha Das (13-1-4-029)
VOLTAGE DOUBLER
USING...
Introduction
Generally, conventional power supply system provides 230V AC supply
which is being used for multiple electric...
What is a Voltage Doubler?
 An electronic voltage multiplier circuit that doubles the voltage by
using the charging and t...
Components Required for our Project
Circuit Diagram
 555 Timer IC
 Diodes -2 (1N4007)
 Resistors- 10k, 33k
 Capacitors...
555 -Timer IC
 The IC 555 has three operating modes:
Bistable mode or Schmitt trigger – the 555 can operate as a flip-flo...
Internal
Structure
Voltage Doubler Using 555 Timer
 This voltage doubler using 555 timer is a simple DC voltage multiplier that
utilizes cap...
Working and Explanation
 We can divide the circuit into two parts, first part consist the
555 timer IC in Astable mode, t...
Circuit Diagram
Practical Voltage Doubler Project
 Step up 6V DC to 10V DC using 555 timer is a practical
voltage doubler project, which ...
 The 555 timer output voltage is made to pass through the voltage
doubler for producing double output voltage. But, for m...
Voltage Doubler using NE 555 timer IC
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Voltage Doubler using NE 555 timer IC

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This presentation shows how a Voltage Doubler circuit can be made using an NE 555 timer IC.

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Voltage Doubler using NE 555 timer IC

  1. 1. Group No. – 9 Partha Pratik Mishra (13-1-4-027) Saurabh Acharjee (13-1-4-028) Sneha Das (13-1-4-029) VOLTAGE DOUBLER USING 555 TIMER IC
  2. 2. Introduction Generally, conventional power supply system provides 230V AC supply which is being used for multiple electrical and electronics loads. But, a few loads or electronics equipment like cathode ray tubes, X-ray systems, Ion pumps, electrostatic system, laser systems, travelling wave tube, and so on requires a high rating power supply for their operation. Thus, the available voltage has to me multiplied using the voltage multipliers. Voltage multiplier is an electrical circuit comprising of diodes and capacitors that can be used for multiplying or increasing the voltage and convert AC to DC by multiplying voltage and rectifying current. There are different types of voltage multipliers such as voltage doubler, voltage Tripler, and voltage quadrupler. Primarily, we are going to discuss about voltage doubler circuit diagram and voltage doubler working.
  3. 3. What is a Voltage Doubler?  An electronic voltage multiplier circuit that doubles the voltage by using the charging and the discharging principle of capacitors is called as a voltage doubler. It consists of major electronics components such as capacitors and diodes. The simple voltage doubler circuit consists of two capacitors and two diodes connected as shown in the figure. The voltage doubler circuit can be a simple rectifier which takes an input AC voltage and generates an output DC voltage that is approximately twice the input AC voltage. Even though there are DC to DC voltage doublers, but in these types of voltage doubler circuits driving circuit is required for switching control. There are different types of voltage doubler circuits such as a simple voltage doubler as shown above, voltage doubler using 555 timer, voltage doubler rectifiers like Villard circuit, Greinacher circuit, etc.
  4. 4. Components Required for our Project Circuit Diagram  555 Timer IC  Diodes -2 (1N4007)  Resistors- 10k, 33k  Capacitors- 22uf (2), 0.01uF (2)  3-12v Power supply source 
  5. 5. 555 -Timer IC  The IC 555 has three operating modes: Bistable mode or Schmitt trigger – the 555 can operate as a flip-flop, if the DIS pin is not connected and no capacitor is used. Uses include bounce-free latched switches.  Monostable mode – in this mode, the 555 functions as a "one-shot" pulse generator. Applications include timers, missing pulse detection, bounce-free switches, touch switches, frequency divider, capacitance measurement, pulse-width modulation (PWM) and so on.  Astable (free-running) mode – the 555 can operate as an electronic oscillator. Uses include LED and lamp flashers, pulse generation, logic clocks, tone generation, security alarms, pulse position modulation and so on. The 555 can be used as a simple ADC, converting an analog value to a pulse length (e.g., selecting a thermistor as timing resistor allows the use of the 555 in a temperature sensor and The 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse generation, and oscillator applications. The 555 can be used to provide time delays, as an oscillator, and as a flip-flop element. Derivatives provide up to four timing circuits in one package. Introduced in 1971 by American company Signetics, the 555 is still in widespread use due to its low price, ease of use, and stability. It is now made by many companies in the original bipolar and also in low- power CMOS types.
  6. 6. Internal Structure
  7. 7. Voltage Doubler Using 555 Timer  This voltage doubler using 555 timer is a simple DC voltage multiplier that utilizes capacitors, diodes, and IC 555 timer in astable mode. Hence, it produces a square wave approximately at 2KHz frequency with the help of R1, R2, and C1 as shown in the figure. The forward biased diode D2 and C3 are connected such that for amplifying the signals. The diode D1 prevents complete discharge of the capacitor C3.  Thus, these basic components such as capacitors C3, C4, diodes D1, and D2 are used for boosting the input power. As the components are selected with appropriate ratings, the circuit accepts the input supply voltage ranging from 3V to 12V. .If the input supply voltage exceeds this range, then the IC 555 may get permanently damaged. The diodes used in this circuit are 1N4007, if we use other diodes such as 1N4148, then the output voltage decreases due to different breakdown voltages.
  8. 8. Working and Explanation  We can divide the circuit into two parts, first part consist the 555 timer IC in Astable mode, to generate the square wave and second part consist 2 diodes and 2 capacitors to double the output voltage.We have configured 555 Timer IC in Astable multi -vibrator mode to generate the square wave of approx. 2KHz, this frequency is decided by the resistor R1, R2 and capacitor C1. Below is he formulae for the same:  F = 1.44 / (R1+2*R2) * C1  When the output at PIN 3 of 555 IC is low, Diode D1 get forward biased and capacitor C3 get charged through the D1. Capacitor C3 get charged up to the same voltage at the source, in our case 5v.Now when output at PIN 3 goes high, D1 get reverse biased and blocks the discharging of the capacitor C3, and at the same time D2 is forward biased and allow the capacitor C4 to charge. Now the capacitor C4 charges with the combined voltage of Capacitor C3 and the input source voltage, means 5v of capacitor C3 and 5v of input supply, so it charges up to 10v (twice the voltage of input source).
  9. 9. Circuit Diagram
  10. 10. Practical Voltage Doubler Project  Step up 6V DC to 10V DC using 555 timer is a practical voltage doubler project, which consists of different blocks such as power supply block for giving input supply voltage to the circuit, 555 timer that is connected in astable mode for developing a DC square wave, multiplier block, output voltage measurement block. The square wave voltage developed by 555 timer IC connected in astable mode is used as input for voltage multiplier or voltage doubler block. Thus, the voltage doubler circuit multiplies the input voltage for generating an output voltage that is approximately equal to twice the input voltage. Here, in this case the output voltage is approximately 10V DC.
  11. 11.  The 555 timer output voltage is made to pass through the voltage doubler for producing double output voltage. But, for maintaining good regulation and to avoid output voltage from falling below the estimated level, we must restrict the load to less than 5mA. Thus, by eliminating the high current drawing loads we can avoid the poor voltage regulation. By adding more number of multiplier stages, we can obtain an output voltage that is equal to three to ten times the input voltage.
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This presentation shows how a Voltage Doubler circuit can be made using an NE 555 timer IC.

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