DC to DC Converter using 555 Timer IC 6V to 35 volts- In this tutorial, you will learn how to make a very simple low cost DC to DC Converter using the 555 Timer IC.
A DC to DC Converter is an electronic circuit or electromechanical device that converts a source of direct current (DC) from one voltage level to another. It is a type of electric power converter. Power levels range from very low (small batteries) to very high (high-voltage power transmission).
DC to DC converters are used in portable electronic devices such as tablets, radios, cell phones, and laptop computers, etc, which are supplied with power from batteries primarily. Such electronic devices often contain several sub circuits, each with its own voltage level requirement different from that supplied by the battery or an external supply (sometimes higher or lower than the supply voltage). Additionally, the battery voltage declines as its stored energy is drained. DC to DC converters can be used to convert small voltages into higher voltages.
A few days back I uploaded an article on dc to dc converter with different examples. In this article I explained everything including the symbol, block diagram, converters topologies, a converter basic working principle, applications, boost converter, buck converter, and so many other things. I highly recommend you should read this article. DC DC Converter Complete Guide, DC DC Converter circuit Examples
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DC to DC Converter using 555 Timer Circuit Diagram:
The heart of the circuit is formed by an ‘old reliable’ 555 Timer IC, which is wired here as a free running Oscillator with a frequency of approximately 10Khz. This 555 Timer IC is configured in the Astable Mode. If you really want to learn the designing then I highly recommend, you should read my article on the 555 Timer IC and then you can resume from here. This article explains everything about the 555 Timer IC, including the 555 time IC Pinout, internal diagram, Mono stable and Astable modes of operation, technical specifications, and much more.
At the output of the 555 Timer IC two NPN and PNP type transistors are connected. The diodes and transistors used in the circuit, each one wastes or drops around .6V, these are the main losses that occur at the semiconductor junctions of the transistors and the rectifier diodes; due to this the output voltage remains low at low input voltage. But the output voltage increases as the input voltage is increased. The circuit above can provide voltage from 7.5 Volts to 35 Volts DC with 60mA. This circuit is also known as the dc to dc boost converter based on the 555 timer IC.
Oscillator IC1 555 Timer generates a signal at a frequency of about 10 kHz. Depending on the output level of the IC, either T1 or T2 is switched ON. This results in C2 being charged during one half period; during the other half period, the charge of C2 is transferred to C3. This results in an output voltage of twice the input voltage less the losses mentioned.
The required input voltage is 6 to 18 Volts. In the circuit diagram of the DC to CD convertor using 555 Timer IC no critical electronic components are used. You can simply use any version of the 555 Timer IC. The other components are just the resistors, capacitors, transistors, and diodes which can be easily arranged.
As this circuit is able to drive two transistors of the sane specifications, if the frequency is reduced and two more transistors are connected at the output, this circuit will be able to drive the most powerful alternator. As you can see in the circuit diagram above, 1N4004 diodes are used, but you can use any other general purpose rectifier diodes, and these will work just fine.