What is adjustable voltage regulator?
An adjustable voltage regulator produces a DC output voltage, which can be adjusted to any other value of certain voltage range. Hence, adjustable voltage regulator is also called as a variable voltage regulator. The DC output voltage value of an adjustable voltage regulator can be either positive or negative.
Can voltage regulators be adjusted?
The wire is wound so that increasing current through the wire will tend to open the contacts and lower the current in the field coil. The only adjustments that you can make to the regulator are the contact gaps and the set points.
How does a regulated DC power supply work?
A regulated supply actively controls its output voltage. These contain additional circuitry that can tweak the output voltage up and down. This is done continuously to compensate for input voltage variations and variations in the current the load is drawing.
How is the voltage and speed of a DC motor related?
The entire process is driven by applying electrical power to the coil, with the source voltage having a direct relationship to the motor’s output speed. To understand this relationship between voltage and speed, let’s look at a typical brushed dc motor circuit. DC motor circuit.
What happens when a DC motor is turned off?
When the motor is turned off or reversed, it will act as a generator and produce a positive high voltage spike. This spike can cause the power supply’s overvoltage protection to trip, shutting down the unit. By using a diode in series with the power supply’s output, as shown below, the spike will be blocked from interfering with the power supply.
How is the output voltage of a DC power supply determined?
In these kinds of supplies, the output voltage is dictated by the turns ratio of the transformer. This is fixed, so instead of making a fixed output voltage their output is mostly proportional to the input AC voltage. For example, such a “12 V” DC supply might make 12 V at 110 VAC in, but then would make over 13 V at 120 VAC in.