There are some factors to consider in calculating MOSFET power dissipation. When the power dissipation is known, it is possible to compute the junction temperature of the MOSFET. Important to take that a MOSFET installed with no heatsink has different computation strategy compared to the one with a heatsink. Small current or low power MOSFETs are usually mounted to PCB
Continue reading
It is very common application to drive a relay with a MOSFET. From household applications to automotive are using this circuit. There are some aspects to consider like the stress on the MOSFET, the level of driving voltage to guarantee MOSFET saturation, the level of the actual voltage applied to the relay coil if enough to meet the requirement and
Continue reading
here are only few power MOSFET design equations to take note when doing design involving this electronic part. You may try deriving these equations if you want a better understanding on how these formulated. These are also given in application notes and some technical blogs but maybe in different form but will result to the same calculation results.
Continue reading
The purpose of power factor correction is to condition the line current. To condition simply means making the line current smooth by filtering the spikes and any irregularities in the waveform. A smoother line current will have low power loss. Some images below are showing a line current with a very bad power factor. The yellow and pink waveforms are
Continue reading
How electric meter works? Electric meter records the consumer energy consumption. Energy is the product of power and time. You may be already heard about the term “kilowatt-hour”. This is the unit of energy measured by the electric meters. The power considered is the real or true power that is consumed by the users. There are two common types of
Continue reading
Cell phones, tabs and other gadgets nowadays are having so many applications which correspond to higher energy consumption that the battery charge cannot last long. Thanks to power banks; we can use our phones and gadgets in the whole day without the need of an AC power. Let us uncover how power bank works. Types of power bank Non-portable Non-portable
Continue reading
The future of charging is through wireless charging. Wireless charging is different from the conventional way of charging phones, tabs and gadgets. It is not using any cable or wires between the charger and the device to be charged. It seems complicated but here we are going to hack how it works and how wireless charger design principle differ with
Continue reading
The days of incandescent lamps are over. LED lighting takes over nowadays as they are much more energy efficient. LED lights on the other hand require a good controlling circuit to operate correctly and this is the so called LED driver circuit. LEDs are basically a form of diode that gives off light when forward biased. A diode is rated
Continue reading
Surge protection circuit is the one referred by many as protector for voltage spikes in AC grid lines; however it is not limited particularly in AC grid lines. Surge protector or surge protection device is a device that will provide surge suppression or voltage spike suppression so that sensitive devices will not get damage. Surge protector can handle voltage spikes
Continue reading
I love LTSpice due to its very easy interface and very handy. It has several built-in models that can be used. For ICs, it has many parts available to be used in simulation although most of it is manufactured by Linear Technology (the maker of LTSpice). For beginners and newbie to LTspice, I suggest you visit the tutorial LTSpice Circuit Simulation
Continue reading