Heater, humidifier or fan including a circuit for controlling the output thereof
US6204623A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1998 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | Dec 17, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/1917
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A heater, humidifier or fan has a control circuit including a microcontroller having an algorithm for controlling power to the appliance. The power to the appliance is varied in accordance with a target temperature/humidity signal and an actual temperature/humidity signal. Preferably, a sensor electrically connected to a clock oscillator input of the microcontroller is used to vary the clock oscillator frequency in response to changes in ambient temperature/humidity. The frequency of the clock oscillator varies in response to changes in temperature/humidity and the microcontroller in response to the frequency of the clock oscillator variably controls the power to the appliance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.