Buck boost converter circuit

Buck Boost converter circuit using LTC3440 Description. A very efficient buck boost converter circuit is shown here. The circuit is based on the LTC3440 buck boost regulator IC from Linear Technology. The LTC3440 requires only one inductor and provides up to 96% efficiency. There is no need of Schottky diode for applications where output voltage is less than 4.3V and the IC can deliver up to 600mA output current. In the circuit the IC is wired as a buck boost regulator providing 3.3V output from a 2.7 to 4.2V input. R1 is the timing resistor which determines the oscillator frequency…

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Voltage converter circuit using TDA2003

Voltage Converter Circuit – 6 to 12 volts One of our valuable readers asked us about any other application of the Audio amplifier IC TDA2003. Well, it can be used to build a Voltage converter circuit. Here’s an example of 6 to 12 volts converter using the same IC Description of the Voltage converter circuit: Two TDA2003 ICs are used here which are wired as oscillators and their outputs are identical but 180 out of phase. Capacitors C3 and C6 determine the frequency of these oscillators respectively. When the output of IC1 is low capacitor C1 charges to the supply…

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12Volt from USB port

12 volt DC Power Supply from USB port The circuit given below infact is a 5 volt to 12 volt converter. It uses the 5 Volts from USB port and converts it to 12 volts DC with the help of IC LT1618. Description : Using this circuit we can convert 5V DC from the computer USB port to 12V DC and a circuit like this will find a lot of application in USB powered systems. The heart of this circuit is IC LT1618 which is a constant current, constant voltage boost converter. The IC has a wide input voltage range…

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Dual Voltage Supplies

Dual Power Supply using LM 320 and LM 340 Bipolar or dual voltage supplies can be easily designed with the help of two 3-terminal regulators. This is shown in the figure above using the IC’s LM320 and LM 340. Opposite-phase ac is provided by the transformer’s secondary and a grounded center tap. The single full-wave bridge converts these into positive and negative dc voltages (with respect to the grounded center tap). The output of the rectifier circuit is filtered with the help of capacitors C1 and C2. You may also like : Voltage Regulators, IC Voltage Regulators and Regulated Power Supply While the LM…

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Regulated Power Supply

INTRODUCTION Almost all basic household electronic circuits need an unregulated AC to be converted to constant DC, in order to operate the electronic device. All devices will have a certain power supply limit and the electronic circuits inside these devices must be able to supply a constant DC voltage within this limit. That is, all the active and passive electronic devices will have a certain DC operating point (Q-point or Quiescent point), and this point must be achieved by the source of DC power. The DC power supply is practically converted to each and every stage in an electronic system….

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Filter Circuits

Filter Circuit – Block Diagram We have learnt in rectifier circuits about converting a sinusoidal ac voltage into its corresponding pulsating dc. Apart from the dc component, this pulsating dc voltage will have unwanted ac components like the components of its supply frequency along with its harmonics (together called ripples). These ripples will be the highest for a single-phase half wave rectifier and will reduce further for a single-phase full wave rectifier. The ripples will be minimum for 3-phase rectifier circuits. Such supply is not useful for driving complex electronic circuits. For most supply purposes constant dc voltage is required…

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Polyphase rectifiers

Polyphase rectifier In polyphase rectifier we will be discussing in detail the working, the input and the output wave forms of a three phase half wave rectifier and three phase full wave rectifier, along with the connections of an interface transformer on a 6-diode rectifier. Three phase Half Wave Rectifier A three phase half wave rectifier, as the name implies , consists of a three phase transformer. Given below is a star connected secondary three phase transformer with three diodes connected to the three phases.As shown in the figure, the neutral point ‘NTRL’ of the secondary is considered as the…

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Full wave bridge rectifier

A Full wave rectifier is a circuit arrangement which makes use of both half cycles of input alternating current (AC) and convert them to direct current (DC). In our tutorial on Half wave rectifiers, we have seen that a half wave rectifier makes use of only one half cycle of the input alternating current. Thus a full wave rectifier is much more efficient (double+) than a half wave rectifier. This process of converting both half cycles of the input supply (alternating current) to direct current (DC) is termed full wave rectification. Full wave rectifier can be constructed in 2 ways….

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Centre-Tap Full-Wave Rectifier

Centre-Tap Full Wave Rectifier We have already discussed the Full Wave Bridge Rectifier, which uses four diodes, arranged as a bridge, to convert the input alternating current (AC) in both half cycles to direct current (DC). In the case of centre-tap full wave rectifier, only two diodes are used, and are connected to the opposite ends of a centre-tapped secondary transformer as shown in the figure below. The centre-tap is usually considered as the ground point or the zero voltage reference point. Centre Tap Full Wave Rectifier Circuit Working of Centre-Tap Full Wave Rectifier As shown in the figure, an…

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Half wave rectifiers

Half-Wave Rectifier Circuit Diagram A simple Half Wave Rectifier is nothing more than a single pn junction diode connected in series to the load resistor. If you look at the above diagram, we are giving an alternating current as input. Input voltage is given to a step down transformer and the resulting reduced output of transformer is given to the diode ‘D’ and load resistor RL. The output voltage is measured across load resistor RL. As part of our “Basic Electronics Tutorial” series, we have seen that rectification is the most important application of a PN junction diode. The process…

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