#currentlimiting

[adafruit]

A4988 breakout prototype testing ⚙️🔧

We got our Allegro A4988 stepper driver breakout PCBs back and are ready to test them. First, we verified that STEP and DIR worked (yes!) and that the LEDs lit (yes, but we need to tweak the resistors to make the brightness even). Then we tried all of the stepper-settings, you can select 1, 4, 8, or 16-microsteps. All the sleep/reset/enable pins work. Finally, we checked the current limiting functionality with a potentiometer that can be twisted to select up to 2A current per coil. This directly affects the torque, so it's easy to test by verifying that we can stall the motor with hands or vise-grips. We'll order these with 2oz copper and get them into production next!

[electricalinsightsdaily]

IEC 62368 1 Leakage Current: Best Guide

The concept of IEC 62368 1 leakage current is crucial in understanding how modern audio, video, and IT equipment stay safe during operation. This international safety standard was developed to address risks posed by energy sources. It replaces older standards like IEC 60065 and IEC 60950. With evolving technologies, especially in multimedia devices, IEC 62368-1 plays a pivotal role in ensuring safety and performance.

IEC 62368 1 Leakage Current: Best Guide Leakage current is a core part of this standard. It deals with the small amount of electric current that can escape from a device's normal circuitry. This escaped current can flow to accessible parts and pose risks to users. Understanding how IEC 62368-1 limits this current is essential for both engineers and manufacturers.

What Is IEC 62368 1 Leakage Current?

IEC 62368 1 leakage current refers to the unintentional electrical current that flows from a powered part to accessible conductive parts. It usually flows through protective insulation, or sometimes through grounding paths. This current must remain within safe limits to prevent shock hazards. Unlike older standards that focused purely on design, IEC 62368-1 takes a hazard-based safety engineering (HBSE) approach. This method assesses the potential energy source, the transfer mechanism, and the protective measures in place. Leakage current measurements are not just about compliance—they're about real-world safety. Too much leakage can lead to discomfort, injury, or in some rare cases, fatalities.

Why Leakage Current Matters in Electronic Devices

Every electronic device using AC mains has the potential to allow current leakage. Although this current is usually tiny, its impact can be dangerous depending on the circumstances. In medical or home environments, where devices may touch human skin for long periods, even small amounts of leakage can become significant. That's why IEC 62368 1 leakage current thresholds are established based on touch current tolerances. The standard also includes requirements for various operating conditions like normal operation, single-fault conditions, and potential grounding failures. These are critical for designing devices that operate safely even during partial failures. Read More...#IEC623681, #LeakageCurrent, #SafetyStandards, #ElectricalCompliance, #TechRegulations, #ProductSafety, #ElectronicSafety, #IECStandards, #CurrentLeakage, #SafetyTesting, #IECCompliance, #ElectronicEquipment, #PowerSafety, #CircuitProtection, #ElectricalEngineering Read the full article

[hcetthermostats]

Production Process of Series Over-current Protector Explore the manufacturing of overcurrent protectors. See how these essential safety devices are made from raw materials to finished products. Learn about their importance in safeguarding against electrical overload. Get a behind-the-scenes look at the production process in this brief overview. #OverloadProtection #CircuitProtection #CurrentLimiting #VoltageSurging #Short-Circuiting

[cnc-electric]

Overcurrent Protector #electric #electrics #electrical #electrician #cncelectric #lowvoltage #overcurrent #currentprotector #currentlimiting #currentlimited #overcurrentprotection #overcurrentprotector (at Wenzhou City Zhejiang Provice China) https://www.instagram.com/p/ByPvkKOlKCU/?igshid=12jpolfssue0z

[adafruit]

TMC2209 stepper motor driver board testing 🤖⚙️🔋

We've been testing the Trinamic/Maxim/Analog/WeylandYutani TMC2209 (https://www.digikey.com/short/8r5m38h8) breakout we designed, and it's working great - the step/dir interface plus the micro-step select allows a microcontroller to control a stepper with just GPIO and true-to-its-name it is a very silent stepper driver, much quieter than the A4988 (https://www.digikey.com/short/tfjt88dd)! There are a few different I/O pins on the TMC: Index tells you when a full step is completed, which is handy to know when you want to change stepper modes on the fly. Diag lets you know when a power or motor failure has occurred. It can also tell when the motor has stalled if it's configured to. Finally, and most interestingly, is the UART interface: this unidirectional pin lets you read and write configuration registers, set 1-128 microsteps, change current limiting, and detect stalls for 'auto homing'. So far, everything works; we're just going to swap the direction of the potentiometer so it twists clockwise to increase the current limit and book PCBs!

[electricalinsightsdaily]

A4988 Current Limit: How to Set A4988 Driver Current Limit?

Setting the A4988 current limit is crucial for ensuring optimal performance and preventing overheating of the motor and the driver itself. The A4988 allows you to adjust the A4988 current limit by manipulating the voltage on the VREF pin.

Here’s a step-by-step guide on how to set the current limit on the A4988:

Steps To Set Current Limit On A4988:

Understand the A4988 Pinout: Familiarize yourself with the A4988 pinout, particularly the VREF pin, which is used to set the A4988 current limit.

Determine the Desired Current: Know the current specification of your stepper motor. This information is typically provided in the stepper motor datasheet.

Identify the Sense Resistor Value: Check the A4988 module or datasheet to find the value of the sense resistor (often around 0.05 ohms). This value is needed for the A4988 current limit calculation.

Read More: A4988 Current Limit

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[cnc-electric]

Undervoltage & overvoltage & overcurrent Protector Устройства защиты от скачков напряжения #overvoltagerelay #voltagecontrolrelay #voltageprotectors #ekm #voltagecontrol #voltageprotector #voltagefluctuations #electric #electrics #electrical #electrician #cncelectric #lowvoltage #overcurrent #currentprotector #currentlimiting #currentlimited #overcurrentprotection #overcurrentprotector (at Wenzhou City Zhejiang Provice China) https://www.instagram.com/p/ByPvNx2l8Qq/?igshid=1uvihjao4vi15

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[smdinc]

TDK Corporation has extended its range of EPCOS PTC-based inrush current limiters. The four new versions of the B5921*J0130A020 series with plastic housing are designed for voltages from 280 V AC to 560 V AC, offer rated resistances from 22 Ω to 100 Ω at 25 °C and have a heat capacity of up to 2.3 J/K. They are UL approved and are qualified to AEC-Q200.

The B594* and B597* series of leaded disk components offer rated voltages of between 260 V AC and 560 V AC. Depending on the type, their rated resistances are between 25 Ω and 1100 Ω. Also type-dependent, these protection devices have been approved in accordance with UL, IECQ and VDE. All types of both series are RoHS-compatible.

[electricalinsightsdaily]

Fault Current and Short Circuit Current: A Quick Guide

Understanding fault current and short circuit current is essential in electrical power systems. These terms are critical in designing safe and reliable networks. While they are often used interchangeably, they have nuanced differences. Knowing how to calculate, manage, and limit these currents helps protect electrical equipment and personnel. This article will explore these concepts in detail. It will also include technical insights and formulas.

Fault Current and Short Circuit Current

What is Fault Current and Short Circuit Current

Fault current and short circuit current refer to the sudden surge of electric current caused by an unintended path in an electrical circuit. This path can be due to equipment failure, insulation breakdown, or accidental contact between conductors. When this happens, the resistance in the circuit drops drastically. As a result, the current shoots up to very high levels. In simple terms, short circuit current is a type of fault current that flows when two points in a circuit that should not be directly connected come into contact. This results in very high current flowing almost instantly.

Types of Faults Leading to Fault Current and Short Circuit Current

Several types of faults can cause high currents in a system. These faults vary in nature and impact: Line-to-Line Fault This happens when two phases come in contact. Line-to-Ground Fault Occurs when one phase touches the ground or any grounded object. Three-Phase Fault This is the most severe fault and involves all three phases shorting together. Line-to-Line-to-Ground Fault A combination of the above types. Each of these faults generates different levels of fault current and short circuit current depending on the system's configuration. Read More..... #FaultCurrent, #ShortCircuitCurrent, #ElectricalEngineering, #PowerSystemProtection, #CircuitBreaker, #CurrentLimiting, #ElectricalSafety, #ElectricalFaults, #ShortCircuitAnalysis, #FaultDetection, #PowerSystems, #ElectricalDesign, #HighCurrentFaults, #ProtectiveRelays, #IndustrialElectrical Read the full article