これはいったい何？電気工作DIYに超便利な激安の電子負荷についてご紹介します！

倹約DIY

23 Jan 202419:42

Summary

TLDRIn this video, the host introduces viewers to the incredibly affordable and convenient electronic load devices, a tool not widely known outside of electrical engineering circles but immensely useful for DIY electrical projects. The host reveals a surprisingly cheap find on Amazon, priced around 3300 yen, significantly lower than the typical cost of branded counterparts. The video covers what an electronic load is, how it operates, and its application in testing electrical circuits by simulating real-world loads. Furthermore, the host demonstrates the device's setup, usage, accuracy, and even delves into a teardown to explore its internal components, showcasing its value for DIY enthusiasts seeking cost-effective solutions for their projects.

Takeaways

🔥 Introduction to an incredibly affordable electronic load for electrical DIY projects, highlighting its sudden drop in price to about 3300 yen.
📬 The electronic load, previously known to the DIY community, has become remarkably cheaper, making it accessible for personal purchase.
💻 Explains the utility of an electronic load in electrical engineering tasks, such as testing circuits for proper operation and measuring power supply capabilities.
🔌 Compares traditional load solutions like cement resistors and incandescent bulbs to the versatility of an electronic load that allows for adjustable resistance (current settings).
🛠 Detailed walkthrough of the electronic load's setup, including its power requirements, connection ports, and initial settings.
💡 Demonstrates the electronic load in action, testing it with a stabilized power supply and highlighting its accuracy and cooling fan activation.
📓 Discusses the importance of the 4-terminal connection method to minimize measurement errors due to voltage drop across wires.
👨‍💻 Offers insights into the electronic load's additional features like cumulative current (mAh) and power (mWh) measurements, and elapsed time display.
🔧 Provides an in-depth look at the electronic load's menu options, including voltage and current calibration, overvoltage protection, and the ability to set operational limits.
🛡️ Challenges the electronic load's limits by setting it near its maximum capacity, discussing thermal performance and safety shutoff mechanisms.
🔩 Concludes with a teardown of the device, revealing its internal components like the MOSFET used for load regulation, and highlights the potential for easy repairs.

Q & A

What is an electronic load and why is it useful in electrical projects?
-An electronic load is a device used in electrical projects to consume power from a circuit under test. It's incredibly useful for testing the circuit's performance under various load conditions, ensuring that power sources like generators or batteries can supply sufficient energy, and identifying any potential issues in the circuit before it is deployed in its intended environment.
How has the price of electronic loads changed recently according to the script?
-According to the script, the price of electronic loads has significantly decreased, making them very affordable. The presenter discovered an electronic load on Amazon priced at approximately 3300 yen, which is considered exceptionally cheap compared to traditional models that can cost tens of thousands of yen.
What are the traditional methods of creating load in electrical experiments as mentioned in the script?
-Traditionally, loads in electrical experiments were created using elements like cement resistors, incandescent bulbs, and stainless steel wires (used as heating elements), which convert electrical power into heat. However, these methods have fixed resistance values and offer limited adjustability.
What advantages does an electronic load offer over traditional load-creating methods?
-An electronic load offers the major advantage of allowing for arbitrary resistance settings, essentially letting the user set any desired current value. This flexibility makes electronic loads incredibly valuable for more precise and varied testing conditions, compared to traditional methods with fixed resistances.
What comes included with the electronic load mentioned in the script?
-The electronic load mentioned in the script comes in a box with the main unit and an AC adapter for power supply. It operates at 12V and starts automatically when plugged in, without the need for a power switch.
How does the electronic load manage to measure and adjust current and voltage?
-The electronic load uses a four-terminal connection method to manage and adjust current and voltage. This method helps reduce the impact of voltage drop across wiring, ensuring more accurate measurements. It also allows for the setting of specific current values and includes features to terminate the measurement based on voltage conditions.
What are some specific features of the electronic load as described?
-Specific features include the ability to set a stop voltage (V-STOP) for measurements, adjust current settings in 0.01A increments up to a maximum of 20A, set measurement times, and calibrate voltage and current measurements. It also has over-voltage (OVP), over-current (OCP), and over-power (OPP) protection settings.
What limitations does the electronic load have?
-The electronic load is limited to a maximum measurement capacity of 150W. Even though it can technically handle up to 300V/38A based on the MOSFET used, the actual operational limit is governed by its thermal management capability and design, which restricts it to 150W to prevent overheating and damage.
How is the electronic load's performance in terms of accuracy?
-The electronic load shows a high level of accuracy, with only a minor discrepancy of 0.02A when compared to the setting value of 3.00A, and voltage measurements that are almost exact to the decimal point. This slight difference can be attributed to voltage drop effects, highlighting the importance of the four-terminal measurement method.
What did the teardown reveal about the internal components of the electronic load?
-The teardown revealed that the electronic load primarily uses a high-spec N-channel MOSFET (FQA38N30) capable of handling 300V/38A for load management. Additionally, it contains a shunt resistor (0.01Ω) for current measurement, an operational amplifier (op-amp), and a microcontroller with its identifier removed, likely for control and measurement tasks.

Outlines

00:00

🔌 Introduction to Inexpensive Electronic Loads

The video begins with an introduction to the concept of electronic loads, highlighting their significance in electrical projects for simulating real-life power consumption scenarios. The narrator discovered an incredibly affordable electronic load on Amazon, priced around 3300 yen, a stark contrast to the typical cost of such devices which can run into tens of thousands of yen. This segment sets the stage for a detailed exploration of the electronic load's features, utility, and the underlying technology, emphasizing the product's value and potential DIY applications.

05:01

📊 Demonstrating the Electronic Load's Features

This section delves into the specifics of using the electronic load, beginning with its unboxing and highlighting the inclusion of an AC adapter. The device operates at 12V and features a user-friendly interface with no switch for turning it on, instead automatically powering up upon connection. The narrator explains the four-terminal connection method used to minimize voltage drop across wires, ensuring accurate measurements. Initial tests are conducted to demonstrate the device's precision in regulating current flow and its ability to display various parameters such as temperature, power consumption, and accumulated charge.

10:08

⚙️ Advanced Functions and Calibration

The narrative progresses to explore the electronic load's advanced settings, including the ability to set minimum voltage levels (V-STOP) for tests, adjust current values, and specify measurement durations. This functionality proves particularly useful for tasks like battery capacity testing. The segment also covers calibration features for voltage and current, highlighting the importance of accuracy in measurements. Protective settings against over-voltage and over-current conditions are discussed, along with a test to push the device to its operational limits, demonstrating its robustness and reliability.

15:09

🛠️ Inside Look and Final Thoughts

In the concluding segment, the narrator disassembles the electronic load to inspect its internal components, revealing a high-quality MOSFET at its core. This teardown offers insights into the device's heat management capabilities and overall build quality. The video wraps up with a recommendation for the electronic load, praising its exceptional value for money and versatility for DIY enthusiasts. The narrator encourages viewers to consider adding it to their toolkit, emphasizing the product's contribution to making DIY electrical projects more accessible and affordable.

Mindmap

Keywords

💡Electronic Load

An electronic load is a device used in electrical engineering to simulate real-world loads on a power supply, battery, or other power source. It can programmatically set to draw a specific amount of current, voltage, or power, providing a versatile tool for testing and validating circuitry and power devices. In the video, the affordability and utility of an electronic load for DIY electrical projects are emphasized, highlighting its ability to significantly enhance convenience in electrical work by allowing for precise control over the load applied to circuits during testing.

💡Price Breakthrough

The term 'price breakthrough' in the video refers to the significant reduction in cost for electronic loads, making them accessible at about 3300 yen. Historically, such devices, especially those from reputable brands, could cost several times more. The video highlights this affordability as a major advantage for DIY enthusiasts, offering high value for a lower price and making advanced electrical testing tools available to a wider audience.

💡Load Device

A load device in electrical engineering is any component or equipment that consumes power from a source. The video explains that an electronic load acts as a sophisticated load device, capable of dynamically adjusting its resistance (or impedance) to simulate various real-world load conditions on power supplies or batteries. This is crucial for testing the functionality and durability of circuits under different energy consumption scenarios.

💡DIY Electrical Projects

DIY Electrical Projects involve individuals creating, modifying, or repairing electrical circuits and devices without professional assistance. The video focuses on how an electronic load can be a powerful tool in such projects, enabling hobbyists to test and optimize their circuits with a precision that was previously expensive or technically challenging to achieve.

💡Resistance

Resistance is a fundamental electrical property that opposes the flow of electric current. In the context of the video, traditional load devices like cement resistors or incandescent bulbs offer fixed resistance, which limits their utility in testing scenarios. An electronic load, by contrast, allows for setting resistance (or more accurately, the current draw) to any desired level, thereby offering much greater flexibility for testing various electrical parameters.

💡4-Wire Measurement

The 4-wire (Kelvin) measurement technique mentioned in the video involves using separate pairs of wires for supplying current and measuring voltage to minimize the impact of wire resistance on the accuracy of the measurement. This method is essential when using the electronic load to test high-current devices, as it ensures the precision of voltage and current readings by preventing voltage drops across the leads from affecting the measurement.

💡Current and Voltage Settings

The video delves into how the electronic load allows for precise adjustments of current and voltage settings, enabling users to specify the exact parameters under which their devices are tested. This feature is crucial for simulating various operational conditions, assessing power supply performance, and ensuring the reliability of electronic components under different electrical loads.

💡Thermal Management

Thermal management refers to the methods and technologies used to control the temperature of electronic systems. The video discusses how the electronic load handles heat dissipation, particularly noting its stability at temperatures around 70°C and the presence of a cooling fan. Effective thermal management is vital to prevent overheating, ensuring the longevity and reliable operation of both the electronic load and the devices under test.

💡Accuracy and Calibration

Accuracy in the context of the video relates to the electronic load's ability to precisely measure and apply the set current, voltage, and power values. Calibration functions are also highlighted, allowing users to adjust the electronic load's settings to match external reference standards, thereby ensuring that measurements remain accurate over time. This capability is essential for conducting reliable and repeatable tests on various electronic components.

💡Overload Protection

Overload protection is a safety feature designed to prevent damage to electrical devices by cutting off the power supply or limiting the current flow when the load exceeds a preset threshold. The video explains how the electronic load incorporates overload protection mechanisms, such as OVP (Over Voltage Protection), OCP (Over Current Protection), and OPP (Over Power Protection), to safeguard both the load itself and the devices being tested against excessive power conditions.

Highlights

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