Low voltage-driven ioniser

13 July 2005 Passive Components

More and more appliances are being manufactured, such as air-cleaners, airconditioners, humidifiers, dehumidifiers, etc, that have a 'negative ion generation' feature. Negative ions are negatively charged molecules that are said to produce 'refreshing' sensations in people.

The generation mechanism is as follows: with conventional negative ion generation, a high voltage (around -5,0 kV d.c.) is applied to a needle-shaped terminal. Since the voltage is high there are safety issues. Also, ozone tends to be generated as well.

Murata has applied high power technology and printing technology from its power durable product line to develop products that it says can generate negative ions at a voltage one half of the conventional models. It also suppresses ozone generation by controlling leakage current.

The MHM Series ioniser unit has the construction of a grounding electrode on a ceramic substrate with 70 μm diameter thick ultra-fine wire attached. This enables low voltage negative ion generation at -1,8 kV d.c. and less than 0,01 ppm ozone generation. In tests, the amount of negative ions generated at

-2,5 kV is 500 000 ions/cc (3 m/s wind velocity, 50 cm away from the sample), while the amount of ozone generated is less than 0,01 ppm (1 cm away from the sample).

The unit measures 13 x 23 x 12 mm, and the lead wire can be attached to it by a self-locking terminal without soldering.

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