Regulated Power Supply

A regulated power supply is a circuit which supplies a stable voltage to a circuit or a device that must be operated within certain power supply limits. The output from the regulated power supply may be alternating or unidirectional, but is nearly always DC (direct current).

A regulated power supply is one that controls the output voltage or current to a specific value; the controlled value is held nearly constant despite variations in either load current or the voltage supplied by the power supply’s energy source. Regulated power supply is preferred in order to prevent the damage of the components. As mentioned above, most of the ICs need standard DC voltage of fixed magnitude for their proper functioning. The majority of the ICs have a required voltage range varying between -18V and +18V.

For the RFID secure access system, we give you a 9V regulated power supply adapter. To study more about the regulated power supply components please refer to fundamentals documents

Voltage regulation

A voltage regulator is designed to automatically maintain a constant voltage level i.e. a regulated power supply. It can be said that the voltage regulators control the output as desired.

Voltage regulators are found in devices such as computer power supplies; where they stabilize the DC voltages used by the processor and other elements. For building the RFID secure access system, you would be provided with IC 7805 which provides a regulated voltage supply of 5V.

The 9V ripple free DC voltage is supplied to the IC 7805 through the input pin. The IC generates a regulated power supply of 5V and the remaining 7V is dissipated to the surroundings in the form of heat.

Connect a 0.1 μF ceramic capacitor between GND and input pin of the 7805 voltage regulator. It should be connected close to the regulator pin, which in turn avoids the noise impact on smooth DC. The arrangement described here should keep the supply clean and constant, to ensure reliable operation of the IC.