Why Precision Matters: Exploring the Advanced Features of LISUN DC Voltage Dips and Interruptions Generators

Abstract: With the rapid development of new‑energy, rail‑transport, communication and medical‑electronics industries, an increasing number of devices adopt DC power supply mode. Transient voltage dips, short interruptions, voltage rise and fluctuations at DC power ports may cause device reboot, data loss, control‑logic disorder and even hardware damage. IEC 61000‑4‑29 and its corresponding Chinese standard GB/T 17626.29‑2013 formulate immunity test specifications for voltage dips at DC input ports. The DC Voltage Dips and Interruptions Generator is the core test instrument for such EMC verification. This paper focuses on the LISUN CSS61000‑29 DC Voltage Dips and Interruptions Generator, illustrates practical hazards of voltage disturbances in DC power‑supply systems, introduces its working principle, core functions and series‑product parameters, and analyzes practical applications in new‑energy industry, industrial communication, rail transit, medical electronics and product‑certification fields. It provides references for R&D engineers and testing laboratories conducting compliance tests according to IEC 61000‑4‑29. 

Introduction

In real‑world operation scenarios of DC power‑supply systems, factors such as energy‑storage‑system switching, sudden load variation, contactor on‑off action and poor line contact will trigger DC‑bus voltage anomalies. These voltage anomalies include rapid voltage dips, complete short‑time interruptions, sustained voltage rise and continuous fluctuations. Different from AC‑grid disturbances, DC‑powered equipment has no zero‑crossing commutation stage, and short‑term voltage distortion may directly affect operating status of backend chips, processors and energy‑storage units. For photovoltaic energy‑storage equipment, voltage fluctuations will interfere with charge‑discharge control logic. For communication base‑station and data‑center power supplies, voltage interruptions will lead to service disconnection. For on‑board and medical equipment, DC‑voltage anomalies may bring direct safety risks.

The IEC 61000‑4‑29 standard and its corresponding national standard GB/T 17626.29‑2013 specify immunity test methods for voltage dips, short interruptions and voltage variations at DC input ports. They require reproduction of various DC‑voltage disturbances under laboratory conditions to evaluate the tolerance capacity of equipment under test. The DC Voltage Dips and Interruptions Generator is a high‑precision intelligent instrument specially designed for immunity testing of DC‑powered devices. It simulates common voltage anomalies at DC power ports, such as transient voltage dips, short interruptions, sustained voltage rise and fluctuations. The LISUN CSS61000‑29 DC Voltage Dips and Interruptions Generator is equipped with a Chinese‑English touch screen, with preset test parameters for national and IEC standards built‑in. Users can call standard test conditions with one click, or customize dip amplitude, duration and cycle times to satisfy personalized test requirements for different products.

DC Voltage Dips And Interruptions Generator_CSS61000 29

Working Principle and Product Series of DC Voltage Dips and Interruptions Generator

Adopting high‑speed power‑electronic switching circuits, the DC Voltage Dips and Interruptions Generator creates controllable voltage mutations on the DC power‑supply loop of equipment under test. It can precisely control voltage‑variation amplitude, disturbance duration, interval time between two disturbances and repeated test cycles. Without additional modification of external DC power sources, it can superimpose dip, interruption or boost disturbance on stable base DC voltage to realize various test waveforms required by standards.

The LISUN CSS61000‑29 DC Voltage Dips and Interruptions Generator consists of four models: CSS61000‑29A, CSS61000‑29B, CSS61000‑29C and CSS61000‑29D, covering different voltage grades of 120 V, 240 V and different output currents of 5 A, 10 A. During model selection, enterprises shall select appropriate models according to rated DC operating voltage and maximum working current of equipment under test. All models support voltage variation from 0 to 120% of rated voltage. The setting range of disturbance duration is 1~60000 ms, and wide setting ranges are also available for interval time and repetition times, which can cover all test conditions specified in IEC 61000‑4‑29.

Industry Application Scenarios of DC Voltage Dips and Interruptions Generator

The DC Voltage Dips and Interruptions Generator plays an important role in R&D and testing work of multiple industries. In the new‑energy sector, this equipment is applied for voltage‑fluctuation immunity tests of photovoltaic inverters, energy‑storage batteries and new‑energy‑vehicle electronic‑control systems. It simulates various DC‑voltage anomalies under charge‑discharge working conditions and verifies operational stability of products under voltage disturbances. In industrial and communication fields, it can test industrial controllers, frequency converters, communication‑base‑station equipment and DC power supplies for data centers, and evaluate continuous‑operation capacity of equipment under complex DC‑bus environments.

Products with extremely high requirements for power‑supply stability, such as rail‑vehicle on‑board equipment and medical electrical instruments, also need verification by means of the DC Voltage Dips and Interruptions Generator to investigate risks of functional failure caused by voltage anomalies. Besides exploratory R&D tests, this equipment is widely adopted by third‑party testing laboratories, quality‑inspection institutes and scientific‑research institutions to perform compliance tests according to IEC 61000‑4‑29 and GB/T 17626.29‑2013, and generate critical test data for product‑quality control and certification. It should be noted that this series is specially designed for DC ports. For AC‑voltage‑dip tests, corresponding AC voltage dip test equipment shall be selected.

Test Implementation and Key Points for Equipment Selection

When performing DC‑voltage‑dip immunity tests, test engineers shall fully cover different dip levels and different durations specified in standards, set repetition test times according to standard requirements, observe and record working status of equipment under test, and distinguish several results: normal operation, automatic performance recovery, recovery requiring manual intervention and hardware damage. Exploratory tests carried out with the DC Voltage Dips and Interruptions Generator during R&D phase can detect shortcomings in power‑supply design, energy‑storage circuits and software logic in advance and avoid certification‑test failure in later stages.

During equipment‑selection procedures, besides rated voltage and rated current, users shall confirm whether time‑parameter‑adjustment ranges of the instrument can cover the shortest and longest disturbance durations required by product standards. If working voltage of equipment under test reaches 240 V, CSS61000‑29C or CSS61000‑29D shall be chosen to prevent insufficient voltage range. Only when output accuracy and time‑control accuracy of the instrument satisfy standard requirements can test results achieve good repeatability and serve as valid basis for product‑compliance evaluation, which is the core reason why test precision is emphasized in the article title.

Conclusion

DC power supply has become a common power‑supply form for a large number of products in new‑energy, communication, medical‑electronics and rail‑transport industries. Voltage dips, short interruptions and voltage‑rise disturbances on DC buses directly threaten product reliability. IEC 61000‑4‑29 and GB/T 17626.29‑2013 establish standardized test frameworks for DC‑port voltage immunity. The DC Voltage Dips and Interruptions Generator is key hardware for completing such tests. The LISUN CSS61000‑29 DC Voltage Dips and Interruptions Generator provides multiple models with various voltage‑current specifications. It can accurately reproduce diverse DC‑voltage disturbances and supports preset‑parameter calling and customized test‑condition configuration. Proper selection and correct operation of the DC Voltage Dips and Interruptions Generator can help enterprises finish exploratory R&D tests and compliance certification, and improve anti‑disturbance capacity of DC‑powered electronic products under practical working conditions.