Miniaturized High-Density Hall-Effect Low Voltage Current Transformer (LVCT) Solution Solusyon ng Miniaturized High-Density Hall-Effect Low Voltage Current Transformer (LVCT)
I. Teknikal na mga Hamon & Layunin
Ang mga tradisyonal na current transformers (CTs) ay may malaking sukat, limitasyon sa pagsukat ng AC lamang, at panganib ng magnetic saturation. Upang tugunan ang mga pangangailangan ng modernong kompakto na mga electronic system (halimbawa, battery management, servo drives, kompakto na inverters) para sa pag-save ng espasyo, lightweight design, DC detection, at high-frequency response, ang solusyon na ito ay nagbibigay ng miniaturized, mataas na density, AC/DC-compatible Hall-effect current sensing approach.
II. Puso ng Teknolohiya: Closed-Loop Flux-Balance Hall Sensor + ASIC Integration
- Miniature Magnetic Circuit & Sensing Core
- Closed-Loop Flux-Balance Architecture: Micro silicon-based Hall chip na naka-embed sa loob ng espesyal na disenyo ng annular flux-concentrating core (high-permeability material).
- Magnetic Field Cancellation Principle:
- Ang magnetic field na gawa ng primary current ay nadetect ng Hall chip.
- Ang high-gain feedback circuit ay nag-drive ng secondary coil upang bumuo ng counteracting field, na nagpapahiwatig ng real-time "zero-flux" state.
- Ang feedback current ay eksaktong mirroring ng primary current, na nag-eeliminate ng nonlinearity at temperature drift na inherent sa open-loop designs.
- Mataas na Integrated Signal Processing
- Dedicated ASIC Integration:
- Low-noise amplification ng Hall signals
- Dynamic offset cancellation circuitry
- High-precision temperature compensation algorithm (na nag-mitigate ng silicon thermal drift)
- Adjustable low-pass filtering (typical: 100–250 kHz)
- Integrated voltage reference at output driver
- Ultra-Compact Structural Design
- Miniaturized Core: Optimized magnetic circuit na may apertures na buntot na Ø5mm (standard through-hole) o rectangular surface-mount openings.
- SMD/Through-Hole Packaging:
- Surface-mount packages (halimbawa, SMD-8) para sa direct PCB assembly, height ≤ 10mm.
- Through-hole design (leadless structure) na nag-aallow ng direct conductor routing sa pamamagitan ng core aperture, na nagbibigay ng galvanically isolated installation.
III. Key Advantages & Value Proposition
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Dimension |
Advantage |
Value Proposition |
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Physical |
- >70% size reduction |
High-density PCB compatibility |
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- Ultralight weight (<5g) |
Ideal para sa drones/handheld devices |
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- SMD/through-hole structures |
Simplified installation |
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Electrical |
- AC/DC current measurement (DC–100kHz) |
EV powertrain monitoring |
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- Galvanic isolation (>2.5kV) |
Solar inverter OCP/PV leakage detection |
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- Virtually immune to saturation |
High-accuracy battery SOC estimation |
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- Low thermal drift (<0.05%/°C) |
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System Cost |
- Microamp-level quiescent current |
Extended battery life sa portable devices |
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- Zero external compensation components |
Reduced BOM & calibration costs |
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- Full SMT automation compatibility |
Scalable para sa million-unit production |
IV. Target Applications
- Battery Management (BMS): High-precision DC current detection (±1%) para sa EV/ESS charge-discharge cycles.
- Compact Inverters: Phase current control sa IGBT modules (100A-range SMD solutions).
- Servo Drives: Multi-axis motor current sampling (parallel SMD CT arrays).
- Smart Meters: DC-component metering (tamper/theft prevention).
- Data Center PSUs: Rack-level current monitoring (high-density through-hole integration).
V. Scalability & Future Roadmap
- Multi-Range Coverage: Single package supports 20A–500A ranges (via core/coil ratio optimization).
- Digital Interface: Optional I²C/SPI output variants (ADC-integrated ASIC).
- High-Precision Tier: Closed-loop achieves 0.5% linearity (25°C), meeting Class 1 metering standards.
