DC Voltage Drop (Rise) Simulator in Voltage Dips, Short Interruptions, and Voltage Variations Immunity Testing

Abstract
This paper focuses on the LISUN CSS61000-29 DC Voltage Drop (Rise) Simulator, a high-reliability device specifically designed to meet the characteristics and requirements of voltage dip and short interruption immunity tests for DC power input ports. In Voltage Dips, Short Interruptions, and Voltage Variations Immunity Testing, this device can accurately simulate common voltage anomaly scenarios at DC power ports, evaluate the operational stability and anti-interference capability of products in the fields of electrical and electronic equipment, new energy, and industrial control under voltage fluctuation environments, and provide key data support for product compliance certification, quality control, and safety design. The paper elaborates on the core significance of Voltage Dips, Short Interruptions, and Voltage Variations Immunity Testing, conducts an in-depth analysis of the design features, technical parameters, compliant standards, and practical application scenarios of the LISUN CSS61000-29 device, and intuitively presents the device’s performance advantages with a data table. It aims to provide comprehensive application references for practitioners in related industries.

1. Introduction
In the actual operation of electrical and electronic equipment, new energy systems (such as photovoltaic inverters and energy storage batteries), and industrial control equipment, the DC power supply serves as the core power source, and its voltage stability directly determines the normal operation and safety performance of the equipment. However, factors such as power grid fluctuations, sudden load changes, and line faults easily cause voltage anomalies at the DC power port, including voltage dips (sudden drop of voltage to a certain proportion of the rated value), short interruptions (voltage temporarily drops to zero and then recovers), and voltage variations (continuous and slow voltage fluctuations). If the equipment has insufficient anti-interference capability, it may lead to functional failure, data loss, or even hardware damage, resulting in severe economic losses.

Voltage Dips, Short Interruptions, and Voltage Variations Immunity Testing, as key means to evaluate the equipment’s ability to resist voltage anomalies, have become essential testing items in the product R&D, production, and certification processes. Based on market demands and standard requirements, LISUN has developed and launched the CSS61000-29 DC Voltage Drop (Rise) Simulator. This device can accurately reproduce various DC voltage anomaly scenarios, providing a high-reliability solution for enterprises to conduct standardized immunity testing. Currently, it has been widely used in quality supervision departments, third-party testing institutions, and related production enterprises. 

2. Core Significance and Testing Principle of Voltage Dips, Short Interruptions, and Voltage Variations Immunity Testing
2.1 Core Significance of Testing
With the popularization of DC-powered equipment in new energy vehicles, data centers, industrial automation, and other fields, the impact of voltage anomalies on equipment has become increasingly significant. For example, if a new energy vehicle charging pile encounters a voltage dip, it may cause charging interruption or a sharp drop in charging efficiency; if a PLC (Programmable Logic Controller) in industrial control experiences a short voltage interruption, it may lead to production line shutdown; if medical equipment suffers from continuous voltage fluctuations, it may affect diagnostic accuracy or even endanger patient safety.

The core significance of Voltage Dips, Short Interruptions, and Voltage Variations Immunity Testing lies in: by simulating voltage anomaly scenarios in practical applications, potential defects in the equipment’s anti-interference design can be identified in advance. This helps enterprises optimize circuit topologies (such as adding energy storage capacitors and designing voltage compensation modules) and improve software protection mechanisms (such as overvoltage/undervoltage alarms and breakpoint resume functions). It ensures that the equipment can still operate stably in complex power supply environments, while meeting the requirements of international and domestic relevant immunity standards, and enhancing the product’s market competitiveness.

2.2 Testing Principle
The core principle of Voltage Dips, Short Interruptions, and Voltage Variations Immunity Testing is “scenario reproduction + performance monitoring”: using a dedicated simulation device (such as the LISUN CSS61000-29), controllable voltage anomaly signals are applied to the DC power input port of the device under test in accordance with the parameters specified by the standards (such as voltage dip amplitude, short interruption duration, and voltage variation rate). At the same time, monitoring equipment (such as oscilloscopes and power analyzers) is used to record parameters such as the output voltage, operating current, and functional status of the device under test in real time, so as to determine whether the equipment has performance deviations or functional failures beyond the allowable range of the standards.

For instance, in the voltage dip test, the DC voltage needs to be suddenly dropped from the rated value (e.g., 24V) to 40% of the rated value (i.e., 9.6V), maintained at this state for 500ms, and then restored to the rated value. The purpose is to observe whether the device under test can still work normally during and after the dip. In the short interruption test, the voltage needs to be instantly dropped to 0V and maintained for 100ms to evaluate whether the equipment has the ability of “automatic restart after interruption” or “no data loss”. In the voltage variation test, the voltage needs to be controlled to rise from 80% to 120% of the rated value at a rate of 0.5V/s to monitor the stability of the equipment during the slow voltage fluctuation process.

DC Voltage Dips And Interruptions Generator_CSS61000 29

3. Design Features of LISUN CSS61000-29 DC Voltage Drop (Rise) Simulator
3.1 Scenario-Specific Design
The LISUN CSS61000-29 device is specifically designed for voltage anomaly scenarios at DC power ports. Compared with general-purpose power supply equipment, it has stronger scenario adaptability:
• Supports bidirectional simulation of “drop” and “rise”: it can not only simulate voltage dips and short interruptions but also simulate scenarios of sudden voltage rise (such as overvoltage caused by power surges), covering both positive and negative voltage anomalies commonly encountered in DC power supplies;
• Fast dynamic response speed: the voltage switching time is ≤10μs, which can accurately reproduce the “instantaneous zero” characteristic in “short interruptions” and avoid test result distortion due to response delay;
• Strong load compatibility: it supports various load types such as resistive, inductive, and capacitive loads, and is compatible with the load characteristics of different devices under test such as new energy batteries, industrial motors, and electronic control modules, ensuring stable testing without abnormalities.

3.2 Operation and Control Advantages
• The device adopts an “industrial-grade hardware + intelligent software” design architecture, balancing operational convenience and testing accuracy:
• Hardware level: it is equipped with a 7-inch touch screen, supporting one-click parameter setting and real-time status monitoring; a high-precision voltage sampling module (sampling accuracy ±0.1%) is used to ensure the accuracy of the output voltage; built-in overcurrent, overtemperature, and short-circuit protection mechanisms prevent equipment damage due to abnormal loads during testing;
• Software level: it supports custom test schemes and can preset 100 groups of commonly used test parameters (such as combinations of different dip amplitudes and interruption durations) to meet the needs of different standards or enterprise-specific requirements; it has an automatic data storage function and can export test reports (supporting Excel and PDF formats), facilitating subsequent data analysis and compliance archiving.

3.3 High Reliability and Stability
The device uses industrial-grade components and a modular design to ensure stability during long-term continuous testing:
• Core components (such as power modules and control chips) are selected from internationally renowned brands. After 1000 hours of continuous operation testing, the failure rate is ≤0.1%;
• The body is made of cold-rolled steel plate, with a surface sprayed with an anti-corrosion coating, adapting to different environments such as laboratories and production workshops;
• It supports remote control function and can be connected to a host computer via RS485, Ethernet interfaces to realize linked testing of multiple devices or unattended testing, improving testing efficiency.

4. Technical Parameters of LISUN CSS61000-29 Device (with Table)
To intuitively display the performance indicators of the device in Voltage Dips, Short Interruptions, and Voltage Variations Immunity Testing, the core technical parameters of the LISUN CSS61000-29 are listed in the table below:

It can be seen from the table data that the device reaches the industry-leading level in key indicators such as voltage adjustment range, time accuracy, and dynamic response speed, and can meet the strict requirements of different industries for Voltage Dips, Short Interruptions, and Voltage Variations Immunity Testing.

5. Practical Application Scenarios and Cases of LISUN CSS61000-29 Device
5.1 Main Application Fields
Based on the device’s performance advantages and standard compatibility, the LISUN CSS61000-29 is mainly used for Voltage Dips, Short Interruptions, and Voltage Variations Immunity Testing in the following fields:
• Automotive Electronics Field: Testing in-vehicle chargers, battery management systems (BMS), in-vehicle radars, and other equipment to evaluate their stability under scenarios such as vehicle startup (voltage dip), generator failure (short interruption), and load switching (voltage variation);
• New Energy Field: Testing the DC input ports of photovoltaic inverters and the charge-discharge management modules of energy storage batteries, simulating voltage dips or interruptions caused by power grid fluctuations to ensure the reliability of the equipment during grid-connected operation of new energy systems;
• Industrial Control Field: Testing PLCs, DC motor drives, sensors, and other equipment to evaluate their anti-interference capability under voltage fluctuations in the industrial power grid (such as voltage variations caused by the startup of large-scale equipment in the workshop);
• Medical Electronics Field: Testing DC-powered equipment such as medical monitors and infusion pumps, simulating voltage dips or short interruptions in the hospital power grid to ensure that the equipment can still work normally in case of voltage anomalies and protect patient safety.

5.2 Typical Application Case
When a new energy vehicle enterprise was developing a DC fast-charging pile for vehicles, it needed to conduct Voltage Dips, Short Interruptions, and Voltage Variations Immunity Testing in accordance with GB/T 18487.1-2015 Electric vehicle conductive charging system – Part 1: General requirements to verify the charging stability of the charging pile under voltage anomalies. The enterprise used the LISUN CSS61000-29 device to carry out the test, and the specific process was as follows:
• Test Preparation: Connect the DC input port of the charging pile to the output terminal of the device. Set the test parameters through the device’s touch screen – the voltage dip amplitude was 50% of the rated voltage (750V), i.e., 375V, with a dip duration of 1s; the short interruption duration was 50ms; the voltage variation rate was 2V/s (rising from 80% to 120% of the rated value);
Test Execution:
• Voltage Dip Test: The device dropped the output voltage from 750V to 375V and maintained it for 1s. During this period, the output current, charging power, and status indicator lights of the charging pile were monitored. The results showed that the charging pile did not experience charging interruption, and the output power remained stable within a deviation range of ±5%;
• Short Interruption Test: The device instantly dropped the voltage to 0V, maintained it for 50ms, and then restored it to 750V. Monitoring showed that the charging pile had a “interruption memory” function, which automatically resumed charging after power restoration without data loss;
• Voltage Variation Test: The device controlled the voltage to rise from 600V (80% of the rated value) to 900V (120% of the rated value) at a rate of 2V/s, and continuous monitoring was conducted for 30s. The charging pile maintained a normal charging state throughout the process without overvoltage alarms or shutdowns;
• Result Analysis: Based on the test data, the charging pile passed the immunity tests under all voltage anomaly scenarios and met the requirements of the GB/T 18487.1-2015 standard. The enterprise optimized the voltage compensation algorithm of the charging pile based on these results, further improving the product’s reliability.

6. After-Sales Support for LISUN CSS61000-29 Device
As a professional manufacturer of testing equipment, LISUN provides comprehensive after-sales support for the CSS61000-29 device to ensure the smooth progress of users’ testing work:
• Technical Support: A professional team of engineers is available to provide 24/7 online consulting services. When users encounter problems in equipment operation or test scheme design, they can obtain immediate support via phone, email.
• Calibration and Maintenance: A calibration certificate (complying with the IEC 61000-4-29 standard) is provided when the device leaves the factory, and free annual calibration services are supported to ensure that the device maintains high accuracy for a long time; in case of equipment failure, a response is guaranteed within 48 hours, and on-site maintenance services are available for domestic users;
• Resource Sharing: Equipment operation manuals, standard interpretation documents, and typical test cases are regularly updated and can be downloaded by users from the official website. At the same time, equipment operation training (online/offline) is provided to help operators quickly master the core skills of Voltage Dips, Short Interruptions, and Voltage Variations Immunity Testing.

7. Conclusion
As a high-reliability device designed for voltage anomaly scenarios at DC power ports, the LISUN CSS61000-29 DC Voltage Drop (Rise) Simulator demonstrates significant advantages in Voltage Dips, Short Interruptions, and Voltage Variations Immunity Testing. Its wide voltage output range, fast dynamic response speed, high testing accuracy, and multi-standard compatibility enable it to accurately reproduce various DC voltage anomaly scenarios and provide reliable data support for the immunity evaluation of products in different industries.

In practical applications, the device can not only meet the quality control needs of enterprises in product R&D and production processes but also provide standardized solutions for compliance testing by quality supervision departments and third-party testing institutions. It effectively helps products improve their ability to resist voltage anomalies and ensures the safe and stable operation of equipment in complex power supply environments. With the continuous development of DC power supply technology, Voltage Dips, Short Interruptions, and Voltage Variations Immunity Testing will become a necessary link in more industries. The LISUN CSS61000-29 device is expected to play a greater role in the new energy, automotive electronics, industrial control, and other fields, promoting the overall improvement of product quality and safety performance in the industry.