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FAQ

Unipolar vs. Bipolar drive for stepper motors, Part 3: Drive ICs

January 10, 2022 By Bill Schweber Leave a Comment

Stepper motors can be configured for unipolar or bipolar drive; each approach has different performance attributes and tradeoffs. Despite their usefulness and suitability of stepper motors for precision positioning, especially in back-and-forth motion applications, one of the factors which delayed their widespread adoption was the challenge of providing the needed driver management. However, the introduction […]

Filed Under: FAQ, Featured, Industrial Tagged With: FAQ

Unipolar vs. Bipolar drive for stepper motors, Part 2: Tradeoffs

January 9, 2022 By Bill Schweber Leave a Comment

Unipolar vs. Bipolar drive for stepper motors

Stepper motors can be configured for unipolar or bipolar drive; each approach has different performance attributes and tradeoffs. The previous part of this article presented the basics of different coil windings and connections for unipolar and bipolar stepper-motor configurations. As in most engineering situations, the next questions are: what is the impact of these differences? […]

Filed Under: FAQ, Featured Tagged With: FAQ

Unipolar vs. Bipolar drive for stepper motors, Part 1: principles

January 6, 2022 By Bill Schweber Leave a Comment

Stepper motors can be configured for unipolar or bipolar drive; each approach has different performance attributes and tradeoffs. Stepper motors are widely used, and, as with so many basic components, they are simple in some ways but also have multiple configurations and operating subtleties. For steppers (the “motor” part of the two-word term is often […]

Filed Under: FAQ, Featured Tagged With: FAQ

Voltage rail splitters and virtual grounds for batteries and PFCs

December 20, 2021 By Jeff Shepard Leave a Comment

Rail splitters are usually associated with battery-powered devices, but that’s not always the case. There are several definitions of a “rail splitter,” sometimes referred to as a “virtual ground” or “pseudo ground.” The most common meaning is creating a new “0V” reference point, usually the mid-point Vin/2 of a single supply voltage such as a […]

Filed Under: batteries, FAQ, Featured Tagged With: FAQ

Power supply regulations, requirements, and standards

December 15, 2021 By Jeff Shepard Leave a Comment

Regulatory standards cover safety and electromagnetic compatibility (EMC) and efficiency. Safety and EMC standards are relatively straightforward, and their numbers are limited. Efficiency is a different matter: Society’s drive to reduce greenhouse gas emissions results in increasingly sophisticated energy efficiency standards for all types of power converters. It started with relatively simple ENERGY STAR standards […]

Filed Under: FAQ, Featured, Power Supplies, Single-phase, Three-phase, Two-Phase Tagged With: FAQ

Power supply control techniques

December 13, 2021 By Jeff Shepard Leave a Comment

Power supply control has evolved from primitive ferroresonant regulation and linear power supplies to simple hysteretic control, analog voltage-mode control, analog current-mode control, and now various approaches to digital control. Compared with switched-mode power supplies, the output of ferroresonant designs is not as precisely regulated, while linear regulation can produce very tightly regulated and very […]

Filed Under: FAQ, Featured Tagged With: FAQ

Two- and four-switch power conversion topologies

December 9, 2021 By Jeff Shepard 1 Comment

Compared with one-switch topologies, two- and four-switch power conversion topologies have several benefits in addition to the ability to process higher power levels. This FAQ will review some of the basic two-, and four-switch topologies. It will look at where they are used and their performance tradeoffs. This article does not consider various switched capacitor […]

Filed Under: Converters, FAQ, Featured Tagged With: FAQ

What is one-switch power conversion?

December 9, 2021 By Jeff Shepard Leave a Comment

DC/DC conversion is the basic building block for many power converter designs including AC/DC power supplies, battery chargers, and uninterruptible power systems. This FAQ reviews some of the most common one-switch topologies. Specialty topologies such as the Joule Thief are not included. This article also does not consider various switched capacitor topologies, a review of […]

Filed Under: FAQ, Featured Tagged With: FAQ

Don’t rush to choose rechargeable batteries…at least, not yet

November 22, 2021 By Bill Schweber Leave a Comment

Using energy harvesting and a rechargeable battery to power a remote wireless IoT node seems like an obvious and straightforward solution, but there are some unique aspects to consider. Don’t get me wrong: I really like rechargeable batteries; in fact, I like them a lot. Whether based on lead-acid, nickel-cadmium, lithium-ion, or other chemistry, our […]

Filed Under: batteries, FAQ, Featured, IoT, Wireless Tagged With: FAQ

Power factor correction topologies

November 17, 2021 By Jeff Shepard Leave a Comment

With the rise of green energy and transportation technologies, power factor correction (PFC) is growing in importance. PFC is an integral aspect of green energy designs since it can improve energy efficiency. PFC topologies can be passive, partial switching, or active, depending on system requirements. The appearance of wide bandgap power semiconductors combined with advanced […]

Filed Under: FAQ, Featured, Power Management Tagged With: FAQ

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