Схемы Питание

Dave Conrad EDN A typical driver for thermoelectric (TE) cooler applications may use pulse width modulation (PWM) to drive an H-bridge circuit. This scheme works but drives the TE device with very large current pulses. These square waves, which are ...

Aaron Lager EDN Most switch-mode power supplies rely on a PWM (pulse-width-modulated) output that is controlled via voltage feedback. A 555-timer IC can inexpensively perform PWM. The circuit in Figure 1 shows how to turn a 555 PWM circuit into an ...

Gregory Mirsky Electronic Design In [1] a cascode connection of two MOSFETs helped eliminate the Miller effect and significantly improve power factor correction (PFC) performance. Recall that the Miller effect is a very large increase in a ...

Rick Mally Electronic Design The circuit uses the ubiquitous LM431 shunt regulator to implement a second-order Sallen-Key low pass filter together with a level shifte. Designs frequently require the conversion of a microprocessor’s pulse ...

Ramkumar Ramaswamy Electronic Design Low-power circuits commonly use transformerless power supplies. However, the use of earth grounds in many of these circuits creates a serious problem that is often ignored. The very popular Microchip Application ...

Giovanni Romeo EDN Controlling a power supply is a necessary task in many applications, such as in battery chargers, solar power controllers, and so on. Industry provides a rich number of off-the-shelf integrated power supplies that, unfortunately, ...

Molly Zhu, Analog Devices Design Note Low dropout (LDO) linear regulators have been widely used in noise-sensitive applications for decades. Nevertheless, noise requirements have become tougher to meet as the latest precision sensors, high speed ...

John Wynne EDN In applications in which you need remote measurement of temperature with a three-wire RTD (resistance-temperature detector), it is important to eliminate the ohmic errors caused by the excitation current flowing through the wiring ...

Shyam Tiwari EDN Using ac-line power sources and batteries for remote humidity sensors is undesirable because these sources can be troublesome if you mount them in inaccessible points, such as smokestacks, cold-storage chambers, or darkrooms, where ...