An LED driver circuit does NOT have a/an _________.

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Question

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ALP CBT 2 Electronic Mechanic Previous Paper: Held on 21 Jan 2019 Shift 1

Answer 1

The schematic of the one LED driver is shown below:

The driver circuit has the following circuit:

Power resistors:

These are used when there is a need to safely convert large amounts of energy into heat using electrical energy as a medium.

They are used as controllable power dissipation devices, protective devices and devices that simulate real-world loads.

Rectifier:

It is an electronic circuit that converts AC to DC.

DC flows only in one direction.
Rectifiers can take a wide variety of physical forms, from vacuum tube diodes and crystal radio receivers to modern silicon-based designs.
Whenever rectification is done we will not get the perfect DC.
Higher frequency components and the unwanted signal components, ripples etc. are present. So, to eliminate those we have to use the filter.

LED driver:

LED driver is a power regulator:

The LED driver provides power and regulates the variable needs of LEDs by providing a constant amount of power as the properties of its change with temperature.
LED drivers to rectify higher-voltage alternating current to low voltage.
Most LED failures are not from the LED but the driver.
LED Drivers typically have to supply less power to LEDs, due to their efficient nature, but they also have to be more precise.
LED Lighting is designed with high precision and require the matching voltage to work effectively.
The modern technology used in the LED driver is a circuit board-based and more akin to a computer than an electrical regulator.