With the rapid development of photovoltaic power stations towards large capacity and high voltage, the DC side current of centralized inverters has generally exceeded the kilo-ampere level, posing unprecedented challenges to the measurement capability, safety and environmental adaptability of current sensors. CHIPSENSE current sensor CM5A 2000 H20 high-precision closed-loop current sensor launched by CHIPSENSE has become a benchmark solution for centralized inverter current detection with its core advantages such as ±2000A ultra-large measurement range, 6kV insulation withstand voltage, and 0.3% accuracy.

一. The core pain points of centralized inverters and the solution of CHIPSENSE current sensor CM5A 2000 H20
1. The problem of kilo-ampere current detection
The DC side current of photovoltaic power stations continues to rise with the expansion of component scale. Traditional sensors are prone to measurement distortion due to insufficient range or excessive temperature rise.
CHIPSENSE current sensor CM5A 2000 H20 solution:
Supports ±2000A rated current (peak ±4250A), covering mainstream 1500V/2000V system requirements.
Adopts dual-core differential design to offset the asymmetric interference of busbar magnetic field, and the full-scale linear error is ≤±0.1%.

2. High-voltage insulation and safety risks
The 1500V system has strict requirements on the insulation of the primary and secondary sides. Ordinary sensors are prone to leakage or breakdown due to insufficient creep-age distance.
CHIPSENSE current sensor CM5A 2000 H20 solution:
The electrical clearance of the primary and secondary sides is 28mm, and the creepage distance is 30mm, which far exceeds the IEC 6180051 standard.
The transient withstand voltage is as high as 23kV, which can resist the impact of lightning surges in photovoltaic systems.

3. Adaptability to extreme outdoor environments
In scenes such as deserts and plateaus, the sensor needs to operate stably for a long time at low temperatures of 40℃ and high temperatures of 85℃.
CM5A 2000 H20 solution:
The core components are encapsulated with automotive-grade epoxy resin and passed the 85℃/85%RH double 85 aging test.
The busbar contact surface is nickel-plated, and the salt spray corrosion resistance level reaches 1000 hours (GB/T 2423.17).

二. Five major technical highlights of CHIPSENSE current sensor CM5A 2000 H20
1. "Zero temperature drift" design under kilo-ampere current
Built-in temperature compensation algorithm, the accuracy deviation of the whole temperature range (40℃~85℃) is ≤±0.5%.
The busbar temperature rise is ≤15K (2000A continuous operation), avoiding mechanical deformation caused by thermal expansion.

2. Anti-saturation magnetic circuit topology
Using nanocrystalline alloy core, the saturation magnetic induction intensity reaches 1.2T, which can withstand 10 times the overload current impact (such as photovoltaic array short circuit failure).
Compared with traditional silicon steel cores, the DC bias resistance is improved by 300%.

3. Industrial-grade EMC protection
Integrated common-mode choke and TVS transient suppression diode, passed EN 6100045 standard level 4 surge test (4kV/2Ω).
Under the inverter IGBT high-frequency switching (20kHz), the output noise is ≤0.1%FS.

4. Modular installation design
Provides two busbar perforation specifications: Φ57.5mm round hole and 61mm×21mm square hole, suitable for copper bars of different cross-sectional areas (maximum support 120mm²).
Supports horizontal/vertical multi-angle installation to save space in the inverter cabinet.

5. Digital interface expansion
Optional CAN bus or RS485 output, directly connected to the photovoltaic power station intelligent operation and maintenance platform, to achieve real-time upload of current data and fault warning.

三. Typical application scenarios in centralized inverters
1. DC side string confluence monitoring
Real-time detection of each string current (±1500A), combined with intelligent IV curve scanning, accurately locate abnormal strings (such as hot spots, PID attenuation).
Actual measurement of a northwest power station: After using CHIPSENSE current sensor CM5A 2000 H20, the troubleshooting efficiency increased by 60% and the power generation loss decreased by 8%.

2. Inverter AC output protection
Detect grid-connected current harmonics (THD<3%) to ensure compliance with GB/T 1454993 standard.
Overcurrent protection response time ≤1μs to prevent IGBT module damage due to short-circuit current.

3. Bidirectional current management of energy storage system
Supports bidirectional measurement of battery charge and discharge current (-2000A~+2000A), with an accuracy of ±0.3%, improving the accuracy of SOC estimation.

四. "CHIPSENSE Model" of Domestic Substitution
1. Cost Advantage
Compared with similar imported products (such as HTFS 2000), the procurement cost is reduced by 50%, and the delivery cycle is shortened from 12 weeks to 4 weeks.

2. Customized Service
Provide busbar aperture customization and output signal customization (420mA/05V) to meet the personalized needs of different inverter manufacturers.
Case: Customized ±2500A/8kV isolation version for a leading inverter company to replace a European brand, saving 12 million yuan in annual procurement costs.

3. Localized Technical Support
48-hour on-site response, providing full-process services from selection and testing to batch delivery.

五.Empirical data: Application report of a 500MW photovoltaic power station

六.Future Outlook: From "Functional Parts" to "Smart Parts"

In the future, CHIPSENSE will develop the next generation of sensors integrating wireless transmission and edge computing, which can analyze current ripple in real time, predict device life, and promote photovoltaic operation and maintenance into the "AI+sensing" era.

CHIPSENSE photovoltaic current detection application cases CHIPSENSE is a national high-tech enterprise that focuses on the research and development, production, and application of high-end current and voltage sensors, as well as forward research on sensor chips and cutting-edge sensor technologies. CHIPSENSE is committed to providing customers with independently developed sensors, as well as diversified customized products and solutions.
“CHIPSENSE, sensing a better world!
www.chipsense.net