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PowerViews
December 19, 2012
Designing for Accurate, Low-Cost Current Measurement
Stéphane Rollier
Product and Marketing Communication Manager, LEM
Power Channels: Automotive Electronics, Motion Control, Power Components, Power Quality Protection, Renewable Energy, Switch-Mode Power
Darnell Group interviewed Stéphane Rollier, Product and Marketing Communication Manager for LEM, the claimed market leader in providing innovative, high quality solutions for measuring electrical parameters. The company’s core products - current and voltage transducers - are used in a broad range of applications in drives & welding, renewable energies & power supplies, traction, high precision, conventional and green car applications.
Stéphane explained that the company has recently introduced its new HLSR series of current transducers, based on a new ASIC design, that provide a cost-effective and technically superior alternative to resistive shunt/optocoupler configurations for insulated current measurements up to 50 Amps. The five new HLSR transducers will satisfy application requirements in, for example, industrial inverters and motor drives; switch-mode and uninterruptible power supplies; specialist power supplies such as welding units; air conditioning; home appliances; but also in renewable-energy systems, for example, in solar combiner boxes and in solar inverters to track the maximum-power-point (MPPT).
Designing for a low-cost, high performance system has in the past been a trade-off or compromise between these two criteria. Normally, in the past, designers have been forced to use the “Shunt + Isolator” products widely available on the market because of cost constraints, but LEM’s new solution is price-competitive against these traditional solutions. Designers also have to face other hard choices in considering many additional detailed parameters; Clearance / Creepage, Gain error, Non-Linearity, Gain drift, Offset drift and Global accuracy. In all these categories, LEM’s new HLSR series was found to deliver superior performance against competition.
The New HLSR Series using LEM’s New ASIC (HG2)
- Current measurements from 10 to 50ARMS
- 5 models: 10ARMS, 20ARMS, 32ARMS, 40ARMS and 50ARMS
- Improved accuracy: ± 3.4% of IPN @ +105°C
- Very high insulation: 4.3 kVRMS 50 Hz/1 min
- Large frequency bandwidth: 100 kHz (-3dB)
- Only 387 mm² occupied as mounting area
- Integrated primary conductor
- Small Size [mm]: 22/8.8 (W) x 20 (L) x 12 (H)
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