NX-100KH Switching-Type Programmable AC Constant Current Source
The NX-100KH series constant current generator (abbreviated as current booster) is a testing equipment independently developed by our company in the second half of 2014, incorporating the latest German modules and integrating our existing technologies.
The NX-100KH series Constant Current Generator (abbreviated as current booster) is a testing equipment independently developed by our company in the second half of 2014, integrating German advanced modules with proprietary technologies. Utilizing numerical control technology, it demonstrates exceptional interference resistance. Compared to previous generations, this model replaces low-power, high-capacity autotransformer voltage regulators with hardware upgrades featuring IGBT transistors and high-permeability iron cores. Through innovative technologies including SPWM synthesis, inverter conversion, PID control, measurement feedback, and software compensation, it delivers constant current output with advantages such as high power capacity, compact size, lightweight design, superior waveform quality, stable performance, and rapid response. Primarily used for testing thermal relays, motor protectors, contactors, circuit breakers, fuses, air switches, switchgear, and protection panels, it also performs primary busbar protection testing and ratio calibration for current transformers. Widely applicable for temperature rise constant current experiments, this equipment is extensively employed in research, production, and electrical testing scenarios across power generation, railway systems, petrochemical plants, metallurgical facilities, and mining operations.
2 Product Features
2.1 Product Features
l SPWM hardware adjustment technology ensures fast response and stable output.
l Powered by high-power MOS/IGBT drivers, it ensures reliable operation with strong overload capacity.
l Suitable for various loads including resistive, inductive, and rectifying loads;
l Equipped with protection functions for voltage upper limit, voltage lower limit, overheating, and other abnormal conditions;
l It features parameter memory function and shortcut key operation mode, making it simple and convenient to use.
l Power supply frequency with adjustable current online;
l The system employs a high-brightness LCD six-bit half-dot matrix display, offering clear visibility, wide viewing angles, and ease of use on production lines.
l It features an RS232 communication interface with a baud rate up to 9600.
2.2 Primary Uses and Scope of Application
l Specialized laboratories (EMI/EMC/Safety compliance);
l Manufacturing facility (quality assurance/life testing);
l Testing of export products with simulated power grids from various countries;
l Product development testing.
2.3 Work environment conditions
l Operating temperature: -10 to 40°C
l Relative humidity: 10%–90% RH
2.4 Product Features and Working Principle
l The sampling hardware achieves waveform synthesis and PID control, delivering stable output waveforms with rapid response speed.
l The power device protection method combining hardware and software ensures rapid and reliable protection.
l The working principle block diagram is as follows:
import |
| rectification |
| filtration |
| power |
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| SPWM compose |
| Voltage Variation and Filtering |
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waveform synthesis |
| PID control |
| Measurement feedback |
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Mainboard control |
| current-controlled |
| effective value |
| export |
Figure 1 Block diagram of working principle
3、 Technical characteristics
3.1 Qualification
◆ product model： NX-500KH
◆ Power input: Three-phase 380±15%,50/60Hz±5Hz
◆ Output opening voltage: 5V
◆ Output current: Adjustable range 0~100A
◆ Output frequency: FM: 40～400Hz;
◆ Frequency stability: ≤0.1%
◆ Current stability: ≤1% (test conditions: 220V,50Hz, under full load resistive load)
◆ Distortion: ≤1.5% (resistive load)
◆ Peak-to-valley coefficient: 1.41±0.10
◆ Source voltage effect: ≤1%
◆ Load effect: ≤1%
◆ Efficiency： ≥85％
◆ Frequency display: Six-digit half LCD with resolution of 0.1Hz
◆ Voltage display: Six-digit half LCD with resolution of 0.1V
◆ Current display: Six-digit half LCD with resolution of 0.1A/0.1A
◆ Current accuracy: ≤0.5
◆ Power display: Six-digit half LCD with resolution of 1W/0.1kW
◆ Power factor display: Six-digit half LCD with resolution of 0.01
◆ Alarm function: The protective device emits an alarm signal (audio and visual) upon activation and displays the fault code.
◆ Working environment: Temperature: -10°C to 40°C; Relative humidity: 10% to 90% (at 40°C)
◆ Overheat protection: The temperature of power devices exceeds 85°C ±5°C
◆ External protection rating: IP2X
◆ Case structure: Desktop