AIR CLEANER WITH AN ELECTRICAL CURRENT IN A CORONA WIRE CORRELATING TO AIR SPEED
An air cleaner including a corona wire assembly, a power supply electrically connected to the corona wire assembly, a fan to draw air through the air cleaner, a fan speed control, and a controller to sense the fan speed and control the power supply, such that an amplitude of a current provided by the power supply to the corona wire assembly is proportional to the fan speed is described. By varying the corona wire assembly current proportionally with the fan speed, the ozone output is minimized at all speeds. So as fan speed decreases, the current supplied to a corona wire assembly decreases, thereby reducing the ozone generated by the air cleaner.
1 . An air cleaner comprising:
a corona wire assembly;
a power supply electrically connected to the corona wire assembly;
a fan to draw air through the air cleaner;
a fan speed control; and
a controller to sense the fan speed and control the power supply, such that an amplitude of a current provided by the power supply to the corona wire assembly is proportional to the fan speed.
2 . The air cleaner of claim 1 , wherein the fan speed control comprises a continuous fan speed control.
3 . The air cleaner of claim 1 , wherein the fan speed control comprises a discrete fan speed control.
4 . The air cleaner of claim 1 , wherein the controller comprises a Pulse Width Modulation (PWM) circuit whose duty cycle controls the power supply.
5 . The air cleaner of claim 1 , wherein the controller steps the voltage provided to the power supply.
6 . The air cleaner of claim 1 , further comprising a collection assembly disposed downstream of the corona assembly.
7 . The air cleaner of claim 1 , wherein the corona assembly comprises corona ground elements.
8 . The air cleaner of claim 1 , wherein the fan comprises an axial fan.
9 . The air cleaner of claim 1 , wherein the fan comprises a centrifugal fan.
10 . The air cleaner of claim 1 , wherein ozone produced by the corona wire assembly is reduced when an electrical current through the corona wire assembly is reduced.
11 . The air cleaner of claim 1 , wherein the fan speed control comprises a high, medium, and low fan speed settings.