regulator

STMicroelectronics has introduced the L9918 automotive alternator regulator, with enhanced features to ensure the stability of 12V vehicle electrical systems. The regulator contains a MOSFET to deliver an alternator excitation current and a freewheeling diode to handle the rotor current when excitation is turned off. Closed-loop operation with load-response control (LRC) and return LRC maintains a…

Renesas Electronics Corporation, a supplier of advanced semiconductor solutions, has unveiled a family of new 700V buck regulators that offers designers several advantages. The new RAA2230XX devices deliver superior power consumption, noise and EMI suppression, as well as reduced overall system cost. They’re ideal for a wide range of applications, including home appliances, sensing systems…

Conventional Ceiling fans operate with voltage divider circuit. Alternatively Ceiling fans can even be operated with Silicon Controlled Rectifiers TRIAC, and 555 timer circuits. This circuit is very cheap in its build. Circuit Diagram Tab 1 shows the TRIAC ceiling fan circuit while circuit diagram tab2 details with the power supply. Working The 230V 50Hz supply…

Fan regulators have an important place in the electrical switch boards. Fan regulators are very similar to light dimmers. Their function is to regulate/control the speed of the fan and provide a convenient environment for the residents.  The traditional regulators which are bulky use a resistance having taps and connected in series with the fan. When we move the knob different amount of resistance gets inserted in the circuit. Although cheap the biggest problem with such a regulator is that a considerable amount of energy is lost in form of heat through the resistance. When the fan is operating at low speed the power loss is significant. The technologically superior electronic regulators overcome these problems by using electronic components to control the speed of the fan.