What is the working principle of voltage regulator?
How Does a Voltage Regulator Work? A voltage regulator is a circuit that creates and maintains a fixed output voltage, irrespective of changes to the input voltage or load conditions. Voltage regulators (VRs) keep the voltages from a power supply within a range that is compatible with the other electrical components.
What is AVR and state its operation?
An automatic voltage regulator (AVR) is an electronic device that maintains a constant voltage level to electrical equipment on the same load. The AVR regulates voltage variations to deliver constant, reliable power supply.
Why do we use IC regulators?
IC Voltage Regulator uses integrated circuits for voltage regulation . One advantage of IC voltage regulator is that properties like thermal compensation, short circuit protection and surge protection can be built into the device. Most of the commonly used IC voltage regulators are three-terminal devices.
What is voltage regulator formula?
Using the formula for the output voltage, VOUT= 1.25V (1 + R2/R1). Being that R1=240Ω, our equation is now 5V= 1.25V (1 + R2/240Ω), so R2=720Ω. So with R2 being a value of 720Ω, the LM317 will output 5V if fed an input voltage greater than 5 volts.
Which IC is used in the voltage regulator circuit?
7805 IC is used in a wide range of circuits. The major ones being: Fixed-Output Regulator. Positive voltage Regulator in Negative voltage Configuration.
Why do we need AVR?
An AVR is necessary for appliances with electronic components inside that are especially sensitive to voltage surges. Example appliances would include: Computer systems, refrigerators, Air conditioner, Flat screen TV, Audio/Video equipment.
How are IC voltage regulators classified?
Voltage regulators are classified into two type’s namely linear voltage regulator & switching voltage regulator. These regulators are mainly used to regulate the voltage of a system, however, linear regulators work with low efficiency as well as switching regulators which work through high efficiency.
How many types of IC voltage regulators are there?
There are three types of IC voltage regulators: IC linear voltage regulators, IC switching voltage regulators, and DC/DC converter chips. IC linear voltage regulators use an active pass element to reduce the input voltage to a regulated output voltage.
How do you calculate AVR?
Determine the total wattage of your refrigerator For example, if your refrigerator has a rated input of 205W, a defrosting input of 150W, plus a 10W lamp, you should add them all together then multiply by 3. AVRs range from 500W all the way up to 5,000W.
How to control the output of an IC voltage regulator?
This shows that the output of the regulator can be controlled by putting desired values for R1 and R2. The IC has a series pass transistor that can handle more than 1.5 A of load current provided that enough heat sinking is provided along with it. Like other IC’s, this IC also has thermal shutdown and current limiting options.
What is the working principle of a voltage regulator?
The main principle behind the working of such a regulator is that a large proportion of the change in supply or input voltage appears across the transistor and thus the utput voltage tends to remain constant.
What is the function of C1 capacitor in IC regulator?
The input capacitor (C1) is used to prevent unwanted oscillations. This IC regulator provides a fixed negative ouput voltage. The 7900 series of IC regulators is commonly used for this purpose. This series (7900) is the negative-voltage counterpart of the7800 series [See Table below].
What is a 3 terminal IC based voltage regulator?
We have given below the block diagram of a 3 terminal IC based voltage regulator. These regulators provide a constant output voltage. A popular example is the 7805 IC which provides a constant 5 volts output. A fixed voltage regulator can be a positive voltage regulator or a negative voltage regulator.