System and method for regulating a heating humidifier

• US 9,084,865 B2
• Filed: 03/15/2007
• Issued: 07/21/2015
• Est. Priority Date: 09/15/2004
• Status: Expired due to Fees

• Current Assignee: Covidien AG (Medtronic Plc)
• Original Assignee: Covidien AG (Medtronic Plc)
• Inventors: Nadjafizadeh, Hossein, Gaudard, Yves, Michel, Patrick, Desfossez, Benjamin
• Primary Examiner(s): Ross, Dana
• Assistant Examiner(s): MATHEW, HEMANT MATHAI
• Application Number:
  US11/686,880
• Publication Number:
  US 20070284361A1
• Time in Patent Office: 3,050 Days
• Field of Search: 219/442, 219/482, 219/492, 219/497, 219/499, 219/508, 128/203.17
• US Class Current: 1/1
• CPC Class Codes: A47J 27/004 with integral electrical heating means drinking cups with integral heating means A47J36/2466
• CPC Class Codes: A61M 16/021 operated by electrical means A61M16/202 – A61M16/205 take precedence
• CPC Class Codes: A61M 16/0683 Holding devices therefor
• CPC Class Codes: A61M 16/109 the humidifying liquid or the beneficial agent
• CPC Class Codes: A61M 16/16 Devices to humidify the respiration air A61M16/1045 takes precedence
• CPC Class Codes: H01L 21/67248 Temperature monitoring

Abstract

A method for supplying a mask through which air flows with a regulated degree of humidification (m) is provided. The method may include: providing a water reservoir configured such that the air circulates in contact with the surface of water within the reservoir is charged with humidity; providing a heating device for heating the water in the reservoir by circulating an electric current; measuring an average intensity (Iav) of the current passing through the heating device; and controlling the average intensity (Iav) relative to a reference value (Iav_c) to obtain a degree of humidification (m) of the air that is independent of the ambient temperature (Ta). An apparatus for regulating the degree of humidification of air flow, as well as a heating humidifier including such a regulation device, are also provided.

Claims

1. A method for supplying a regulated degree of humidification (m) of air, the method comprising:

providing a water reservoir configured such that air contacting a surface of water in the reservoir is charged with humidity;

providing a heating device for heating the water in the reservoir by circulating an electric current;

measuring an average intensity (Iav) of the current passing through the heating device; and

controlling the average intensity (Iav) relative to a reference value (Iavc) to obtain a degree of humidification (m) of the air that is independent of an ambient temperature (Ta);

wherein the heating device is supplied with a rectified sinusoidal current including passing some half-cycles and blocking other half-cycles; and

wherein controlling the average intensity (Iav) comprises;

determining a count of the number of half-cycles passed to the heating device during a given time interval, and

controlling, based at least in part on the count of the number of passed half-cycles, the number of half-cycles passed to the heating device during the given time interval to regulate the average intensity (Iav) of the current passing through the heating device.

2. A method according to claim 1, further comprising:

storing a reference power (Pc) supplied to the heating device, the reference power (Pc) selected by a user;

measuring and storing a peak value (Umax) of a feed voltage for the heating device;

calculating the reference value (Iavc) of the average intensity of the current passing through the heating device based on the reference power (Pc) and the peak value (Umax) of the feed voltage, and storing the reference value (Iavc) of the average intensity;

measuring and storing the average intensity (Iav) of the current passing through the heating device;

comparing the measured value of the average intensity (Iav) and the reference value (Iavc) of the average intensity; and

controlling the number of passing half-cycles during a given time interval to reduce the difference between the measured value (Iav) of the average intensity and the reference value (Iavc) of the average intensity.

7. A method according to claim 1, wherein the voltage of the half-cycles supplied to the heating device is rectified line voltage.

3. An apparatus for regulating the degree of humidification (m) of an air flow in contact with a surface of water located in a reservoir and intended to be delivered to a user, the apparatus comprising:

a heating device operable to heat the water by circulating an electric current;

means for measuring an average intensity (Iav) of the current passing through the heating device;

means for regulating the average intensity (Iav) relative to a reference value (Iavc), including;

a rectification device for rectification of the voltage delivered by the line voltage;

a counter for determining a count of the number of half-cycles passed to the heating device during a given time interval; and

a blocking device operable to block some of the half-cycles of the voltage at 0;

wherein the rectification and blocking devices are configured such that the heating device can be supplied a rectified sinusoidal current including passing some half-cycles and blocking other half-cycles; and

wherein the blocking device is operable to control, based at least in part on the count of the number of passed half-cycles, the number of half-cycles passed to the heating device during the given time interval as a function of the difference between the measured value (Iav) and the reference value (Iavc) of the average intensity.

4. An apparatus according to claim 3, further comprising:

selection means allowing a user to select a desired reference power (Pc);

means for measuring a peak value (Umax) of the feed voltage of the heating device and an average intensity (Iav) of the current passing through the heating device;

means for storing the reference power (Pc) and peak value (Umax) of the feed voltage;

means for calculating a reference value (Iavc) of the average intensity of the current passing through the heating device from the reference power (Pc) and the peak value (Umax) of the feed voltage;

means for storing the reference value (Iavc) of the average intensity and the measured average intensity (Iav);

means for comparing the measured value (Iav) and the reference value (Iavc) of the average intensity; and

means controlled by the comparison device and operable to act on the power supply of the heating device to reduce the difference between the measured value (Iav) and the reference value (Iavc) of the average intensity.

8. An apparatus according to claim 3, wherein the voltage of the half-cycles supplied to the heating device is rectified line voltage.

5. A heating humidifier apparatus, comprising:

a water reservoir configured to house water;

a heating device operable to heat the water in the reservoir by circulating electric current;

an air input and output configured such that an air flow can circulate in contact with the surface of the water and be charged with humidity; and

a control device for regulating the degree of humidification of the air flow, including;

means for measuring an average intensity (Iav) of the current passing through the heating device;

means for regulating the average intensity (Iav) relative to a reference value (Iavc);

a rectification device for rectification of the voltage delivered by the line voltage; and

a blocking device operable to block some of the half-cycles of the voltage at 0;

wherein the rectification and blocking devices are configured such that the heating device can be supplied a rectified sinusoidal current including passing some half-cycles and blocking other half-cycles; and

wherein the blocking device is operable to;

determine a count of the number of half-cycles passed to the heating device during a given time interval, and

regulate the average intensity (Iav) relative to a reference value (Iavc) by controlling, based at least in part on the count of the number of passed half-cycles, the number of half-cycles passed to the heating device during the given time interval as a function of the difference between the measured value (Iav) and the reference value (Iavc) of the average intensity.

6. A heating humidifier apparatus according to claim 5, wherein the control device further comprises:

selection means allowing a user to select a desired reference power (Pc);

means for measuring a peak value (Umax) of the feed voltage of the heating device and an average intensity (Iav) of the current passing through the heating device;

means for storing the reference power (Pc) and peak value (Umax) of the feed voltage;

means for calculating a reference value (Iavc) of the average intensity of the current passing through the heating device from the reference power (Pc) and the peak value (Umax) of the feed voltage;

means for storing the reference value (Iavc) of the average intensity and the measured average intensity (Iav);

means for comparing the measured value (Iav) and the reference value (Iavc) of the average intensity; and

means controlled by the comparison device and operable to act on the power supply of the heating device to reduce the difference between the measured value (Iav) and the reference value (Iavc) of the average intensity by controlling the number of passing half-cycles of a rectified sinusoidal current during a given time interval.

9. A heating humidifier apparatus according to claim 5, wherein the voltage of the half-cycles supplied to the heating device is rectified line voltage.