What is transistor shunt regulator?
A transistor shunt regulator circuit is formed by connecting a resistor in series with the input and a transistor whose base and collector are connected by a Zener diode that regulates, both in parallel with the load. The figure below shows the circuit diagram of a transistor shunt regulator.
What is series and shunt regulator?
A series regulator is connected in series with the load to stabilize the regulator’s output voltage. A shunt regulator, on the other hand, is connected in parallel to the load to stabilize the device’s output voltage.
Which is a better regulator between shunt type and series type?
Shunt voltage regulator has poor voltage is constant. Series voltages regulator has better voltage regulation. The control element has to bear the load voltage across it. So, it is a high voltage low current device.
Which is better shunt or series regulator?
What should the shunt resistance be?
Shunts are rated by the maximum current and voltage drop at that current. For example, a 500 A, 75 mV shunt would have a resistance of 150 microohm, a maximum allowable current of 500 amps and at that current the voltage drop would be 75 millivolts.
What are advantages and disadvantages of shunt?
It has poor efficiency for large load currents. It has high output impedance. The output DC voltage is not absolutely constant because both VBB and VZ voltages decrease with increase in room temperature. The DC output voltage cannot be changed easily as no such means is provided.
What kind of regulator does a tube CAD use?
The 12B4 is a rugged little triode that has won over many tube fanciers; with good cause, as it’s a great-sounding little triode that doesn’t cost as much as 98-point bottle of Chardonnay. In this regulator, the 12B4 works to eliminate any AC perturbation at the output.
What is the DC gain of a tube regulator?
With all-tube voltage regulators, at least the gain is limited to seldom more than 100, or 300 at the most; with solid-state voltage regulators, the DC open-loop gain can easily be 200,000, as that is the lowly LM741’s open-loop gain. With such a high open-loop gain, layout and wiring practice become critical.
How does a 12b4 high voltage regulator work?
In other words, when the B+ voltage climbs up, the 12B4 pulls down by conduction more; conversely, when the B+ voltage sags, the 12B4 lets go of some of its current conduction, pushing the B+ voltage higher. All in all, this is a nice, easygoing high-voltage regulator that neither offers strict DC regulation or ultra low AC output impedance.