Contents
What is a shunt voltage?
Shunt. A shunt voltage reference only requires two terminals and is functionally similar to a Zener diode where the voltage drop across the device is constant after reaching a minimum operating current through the device.
What is a constant voltage regulator?
A voltage regulator is a system designed to automatically maintain a constant voltage. In an electric power distribution system, voltage regulators may be installed at a substation or along distribution lines so that all customers receive steady voltage independent of how much power is drawn from the line.
How does a constant voltage regulator work?
A voltage regulator generates a fixed output voltage of a preset magnitude that remains constant regardless of changes to its input voltage or load conditions. It compares the output voltage with a precise reference voltage and adjusts the pass device to maintain a constant output voltage.
Where are shunt regulators used?
Shunt regulators It is, however, simpler, sometimes consisting of just a voltage-reference diode, and is used in very low-powered circuits where the wasted current is too small to be of concern. This form is very common for voltage reference circuits. A shunt regulator can usually only sink (absorb) current.
What is basic shunt regulator?
The shunt regulator or shunt voltage regulator is a form of voltage regulator where the regulating element shunts the current to ground. The shunt regulator operates by maintaining a constant voltage across its terminals and it takes up the surplus current to maintain the voltage across the load.
How does a shunt regulator maintain the current?
The shunt regulator or shunt voltage regulator is a form of regulator where the regulating element shunts the current to ground. By maintaining a constant voltage across its terminals it takes up the surplus current to maintain the voltage across the load.
Can a shunt be used in a high current situation?
Shunt voltage regulators are not particularly effective or efficient in high current situations,. The simple Zener diode voltage regulator, when used as a low current voltage reference is widely used, and its inefficiency can be tolerated in view of the low current.
Which is the ideal shunt voltage for a PSU?
Zener diode Vz = 22 gives about 23-24V, and ideal PSU voltage should be 6-7V above shunt voltage (regulated voltage). If you look at Fig. 3 (bottom), you will notice that the feed resistor 27R is replaced by Erno’s constant-current regulator using a MOSFET. The input resistor of 2R2 gives a current of approximately 300mA.
Which is better series reference or shunt voltage reference?
Though similar in concept to a linear voltage regulator, it is designed for lower current and higher accuracy. A series reference operates in series with the load ( Figure 1 ), and can be regarded as a voltage-controlled resistance between the V IN and V OUT terminals.