WO2010129715A1 - Procédé et système de détection de débordement - Google Patents

Procédé et système de détection de débordement Download PDF

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Publication number
WO2010129715A1
WO2010129715A1 PCT/US2010/033786 US2010033786W WO2010129715A1 WO 2010129715 A1 WO2010129715 A1 WO 2010129715A1 US 2010033786 W US2010033786 W US 2010033786W WO 2010129715 A1 WO2010129715 A1 WO 2010129715A1
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WO
WIPO (PCT)
Prior art keywords
capacitance
change
sensor element
controller
predetermined threshold
Prior art date
Application number
PCT/US2010/033786
Other languages
English (en)
Inventor
Jianming Huang
Xiaolin Chen
Original Assignee
Cypress Semiconductor Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cypress Semiconductor Corporation filed Critical Cypress Semiconductor Corporation
Priority to CN2010800290589A priority Critical patent/CN102461330A/zh
Publication of WO2010129715A1 publication Critical patent/WO2010129715A1/fr

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like

Definitions

  • This disclosure relates to the field ol user interface devices and, in particular, to the detection of spill-over in cooking appliances and other suitable types ot devices, such as, tor example, induction cookers and the like.
  • An induction cooker is an electric cooker thai uses principles at electromagnetic induction to heat.
  • the water or food in the cooking container can spill over to the cooker cover as a result of some accident or from boiling. This may result in some risk of damage to the appliance/devi ce or injury to the users.
  • buttons or other electronics outside the cooking container mav be damaged or inadvertently acth a ted.
  • One method for detecting spill-over is ultrasonic detection; however, the
  • Figure t illustrates a cross section of a cooker cover including a capacitivL' sensor clement for detecting a spill-over condition, according to an embodiment.
  • Figure 2A illustrates a bottom view of an embodiment ot ⁇ capacHU e sensor element for detecting a spill-over condition.
  • Figure 2B illustrates a side view ot an embodiment ot a capacitive sensor element for detecting a spill-over condition.
  • Figure 3 illustrates a bottom view of a cooker cover including eapacitive sensor elements for detecting a spill-over condition, according to an embodiment.
  • Figure A is ⁇ circuit diagram illustrating an embodiment of a capacitance defection circuit.
  • Figure 5A is a circuit diagram illustrating an embodiment of a capacitance detection circuit.
  • Figure 5B is a circuit diagram illustrating an embodiment ol a capacitance detection circuit
  • Figure b is a circuit diagram illustrating an embodiment of a capacitance detection circuit.
  • Figure 7 is graph illustrating changes in count values corresponding to change in capacitance of a capacitive sensor element according to an embodiment
  • Figure 8 is a flow diagram illustrating one embodiment ot a spill-over detection process.
  • an appliance such as an induction cooker
  • a spill-over or overflow condition may occur, tor example, when a substance or liquid being heated boils over or otherwise escapes a heating container.
  • a spiil-over or overflow condition may also occur when a liquid or other substance is present on anv surface of the heating appliance outside of the heating container. For example, spilling or dripping liquid or another substance on a surface of the heating appliance may result in an overflow condition being triggered.
  • such an appliance may further perform some action, such as turning off or reducing cooking heat in response to detecting the overflow condition.
  • the spill-over detection mechanism can include a controller and one or several capacitance sensors that are assembled around the cooking container.
  • the capacitance sensors can be connected to the controller.
  • the controller is configured to detect capacitance changes on the sensors to determine if the spill-over condition is occurring. It such a condition occurs, the controller can automatically stop or reduce the heating power of the appliance.
  • the controller may be a stand-alone controller, or can be integrated into the system controller, as a partial function of the system controller. In one embodiment, the controller uses one additional pin for detecting the spill-over condition.
  • an overflow detection mechanism may be used in a ceramic eooktop, a rice cooker, or other appliance.
  • Figure 1 illustrates a cross-section of a cover for an inductive cooker that includes a capacin ' ve sensor element for detecting a spill-over condition, in one embodiment, a capacitive senior element 102 made from metal or another conductive material is attached under the cooker cover KU and is connected or otherwise coupled to a controller (not shown).
  • the capacitive sensor element 102 substantially siu rounds a perimeter of a heating container, such as a cooking container used to contain iood or other substance that is being cooked by an induction cooker.
  • a heating container such as a cooking container used to contain iood or other substance that is being cooked by an induction cooker.
  • the capacitive sensor element 102 may be positioned around the edges of the cooking cover 101 so that when a cooking container is placed on the cooking cover 101, the capacitive sensor element 102 surrounds the base of the cooking container, in an embodiment, the capacitive sensor element 102 may be situated such that any liquid or other substance spilling over from the heating container will land on or near the capacitive sensor element 102 For example, the capacitive sensor element 102 may surround the opening of the cooking container.
  • a metal ring can be adhered, coupled, or otherwise connected under the edge of a cooker cov er, or a metal film can be plated under the cover 101.
  • the shape of the eapacitive sensor element 102 may be a circle, rectangle, bar, or some other arbitrary shape.
  • one or more capadtive sensor elements may be positioned around an inside surface of a lid of the heating appliance, In one embodiment the position of the sensor element inside the lid allows the sensor element to detect a liquid or other substance that is nearly overflowing,, before the liquid or other substance overflows from the heating container,
  • FIG. 2A illustrates an embodiment in which the capadtive sensor element 102 comprises a metal ring that is attached near the edge of cooker cover 101, then connected to a controller 203 as an input.
  • Cooker cover 101 may be part of an outer housing of an inductive cooker, for example, that covers the heating element of the inductive cooker.
  • Figure 2B illustrates a side view of the cooker cover assembly including the cooker cover 101, capadtive sensor element 102, and controller 203.
  • the controller 203 includes a processing element such as a state machine or a processor coupled with memory tor performing operations related to measuring and recording capacitances or controlling an amount of heat generated.
  • an equivalent capacitance CP exists between ground 105 and capacitive sensor element 102.
  • the proximity of the overflowing substance to the eapacitive sensor element 102 introduces an equivalent capacitance Cr between the substance, such as water 104, and the capacitance sensor element 102.
  • the equivalent capacitances O and Gp can modeled as capacitances connected in parallel
  • the capacitances G and Ci 1 may be represented by the equivalent capacitance Cx between the eapacitive sensor element 102 and ground.
  • the capacitance CF when other factors are substantially constant, the capacitance CF remains the same regardless of a spill-over condition.
  • Capacitance O changes according to the amount of water 104, or other substance over the eapacitive sensor element 102.
  • the equivalent capacitance Cx will reflect the changes in Ck
  • the detection of changes in G may be performed in many different ways. In one embodiment the changes in G : may be detected through the charging and discharging of the capacitance Cx.
  • the spill-over detection functionality may he combined with other system function controls such as, for example, capacitance- based touch buttons for controls ing the induction cooker.
  • the capacitance sensor can be, for example, a touch button input for the controller, although any suitable capacitance sensor can be used for spill -over detection
  • an Induction cooker may have a number of capacitive touch buttons used to control functions such as the power state or temperature or the cooker.
  • the c ⁇ p ⁇ citive sensor clement 102 used for spill-over detection may be connected to the controller 203 and operated tn a similar fas-hton at> the capacity e touch buttons.
  • the capacitance of the capacitive sensor element may also be affected by external laetors such as AC interference from, power supply switching.
  • the controller may periodically update a baseline value of Cx, then compare a measured value of Cx to the updated baseline value of Cx to determine a change m Cx.
  • a predetermined threshold may be selected such that when the change in Cx exceeds the predetermined threshold, the controller detects the spill-ovei or overflow condition.
  • a capacitance sensor installed under the cooker cover may be connected or otherwise coupled with the controller. During operation oi: the inductive cooker, the controller periodically measures the capacitance Cx.
  • the controller detects ⁇ change in the equivalent capacitance Cx and the detected change is greater than the predetermined threshold, then a spill-over or overflow c ondition is detected [0031]
  • the controller in response to detecting the spill -over or overflow condition, the controller indicates that the condition has occurred. I he indication may be, for example, a control signal that is sent to a switch for turning off a heating element of the appliance or tor reducing the amount oi heat supplied by the heating element.
  • the capadtive sensor element 102 rnay be one of sev eral capacitive sensor elements together substantia! ⁇ surround the perimeter of the heating container, such as the base or an opening o! the heating container.
  • Figure 3 illustrates an embodiment in which a spill-over condition may be detected by more than one capacitive senior element.
  • the capacitive sensor elements 301 and 302 are positioned at the edges of the cooker cover 101. liach of the sensor elements 301 and 302 is connected to controller 203.
  • the controller can detect the capacitance changes on each of the sensor elements 301 and 302 to determine if the spill-over condition has occurred.
  • the spill-over condition is triggered when a capacitance change for any of the sensor elements 301 and 302 is greater than a predetermined threshold.
  • the controller can detect the changes in capacitance tor the capacitive sensor element 102, 301, or 302 using any one of several methods for detecting capacitances.
  • the following three examples show different implementation circuits for detecting changes in the capacitance of the capadtive sensor elements 102, 301, and 302.
  • Figure 4 illustrates one embodiment of a circuit for detecting changes in capacitance of a capadtive sensor element, such as capacitive sensor element 102, 301, or 302, using a relaxation oscillation method.
  • the detection circuit 400 measures a capacitance of a sensor element by generating a periodic signal based on the capacitance of the sensor element, and detecting a change in the period of the oscillating signal, where the change in period results from a change in the capacitance of the sensor element.
  • the detection circuit 400 includes comparators 407 and 408 with reference voltages 402 and 403 applied to the inputs of comparators 407 and 408, respectively.
  • Comparator 407 is coupled through a buffer to the S input of the RS latch 409, and comparator 408 is coupled to the R input of the latch 409.
  • Latch 409 has an output Q BAR that is coupled to a counter 404.
  • Counter 404 is coupled to a controller 405, which is further coupled with a timer 406.
  • the Q B AR output of latch 409 is also coupled with a resistor 401.
  • Resistor 401 is coupled to ground through a capacitance Cx, representing the capacitance between a capacitive sensing element and ground.
  • a predetermined threshold for detecting a spili-over condition may be defined as a threshold number of: transitions of Q B AR detected by counter 404.
  • Figure 5 A illustrates a circuit tor performing a sigma-delta method to detect changes in capacitance, according to an embodiment
  • Detection circuit 501 is configured to detect changes in the capacitance Cx 514.
  • Cx 514 is coupled with switches 512 and 513, which are controlled by a timer 5 ⁇ t.
  • Switch 513 is connected to ground, and switch 512 is coupled with a ⁇ egath e input of a comparator 509
  • a reierenee voltage V REF 501 is coupled to the positive input ol comparator 509
  • the output of comparator 509 is coupled with a latch 502, and the output of latch 502 controls a switch 506, which connects the latch 502 output through a resistor R B 507 to a modu lation capacitor Cvon 508.
  • I atch 502 and counter 503 are clocked by clock 505.
  • Counter 503 is coupled with controller 504.
  • switches 512 and 513 are complementary switches lhat operate m a non-overiapping manner, such that the sw itches 512 and 513 are not simultaneously closed at any time during the switching cycle.
  • Tinier 51 1 controls the switching of the switches 512 ami 513. With the switches ⁇ 12 and ⁇ 13 in operation, the capacitance 514 is repeated. K charged and discharged to ground.
  • FIG. 8 illustrates a circuit for measuring capacitance of a eapacitive sensor element using a successive approximation method, according to an embodiment.
  • the detection circuit 600 includes a current source 601 that is used to charge the capacitance Cx 603, which is an equivalent capacitance of a capacttive sensor element, such as eapacitivo sensor element !02.
  • the capacitance Cx 603 is connected with a negative input pin of a comparator 607 through a Sow pass filter 602.
  • the comparator When the voltage on Cx 603 is lower than the reference voltage Vw i applied to the positive input oi comparator 607, the comparator outputs a high signal to the enable pin of counter 604 to enable counting.
  • the voltage on Cx 603 increase as Cx 603 is charged.
  • the comparator 607 outputs a low signal and the counter 604 slops counting.
  • the final count value of the counter reflects the charge time for charging Cx 603, which is in turn affected by the capacitance of Cx 603.
  • the controller 605 can detect changes in capacitance from the count value.
  • Figure 7 illustrates changes in count value 700 resulting from changes in capacitance of a capacitive sensor element, such as capadtive sensor element 102.
  • the X axis represents time 701 and the Y axis represents count values 702.
  • the duration before time 710 is the time when an appliance, such as an induction cooker, implement ing the spill-over detection mechanism is powered off.
  • the power is turned on and AC noise from the power supply of the appliance begins affecting the capacitance of the capacitive sensor element 102.
  • This causes an increase in the count values detected betweenm time 710 and 711.
  • the count value during this time may be stored as a measure of the baseline capacitance. This baseline count value may then he compared with future count values to determine whether the capacitance of the sensor element has changed by more than a predetermined threshold .
  • a substance such as water 104 is on or near the capacitive sensor element 102, causing the count value 700 to increase, in one embodiment, tills increase in count value corresponds to a spiil-over or overflow condition.
  • 100491 In addition to the ahove-described methods, there are many other suitable ways for detecting the change in capacitance associated will a spill-over or overt Io vv.
  • FIG. 7 is ⁇ flow diagram illustrating a spill-over or overflow detection process 800, according to one embodiment.
  • the process 800 may be implemented in a controller such as controller 203 connected to a capacitive sensor element 102, tor example.
  • the controller may be implemented in an appliance such as an inductive cooker.
  • Process 800 begins at block 802.
  • the controller records a baseline capacitance with the appliance powered on.
  • the controller may record a count value measured at a time between times 710 and 71 1, when the appliance is powered on and nothing is on or near the eapa ⁇ tive sensor element. From block 802, the process 800 continues at block 804.
  • the controller detects a change in a capacitance of the capacitive sensor element.
  • the controller may detect the change in capacitance through the operation of a detection circuit such as circuit 400, 510, or 600. hi one embodiment, the detection circuit returns a measured count value that may be compared with the base! me count value recorded at block 802. From block 804, the process 800 continues at block 806.
  • the controller determines whether the change in capacitance of the capacitive sensor element exceeds a predetermined threshold. In one embodiment, the controller calculates a difference between the baseline count value and the measured count value, then compares this difference (representing the change in capacitance) to the predetermined threshold. If the capacitance change does not exceed the predetermined threshold, the process 800 continues back to block 804, such that the controller continues to monitor the capacitive sensor element for changes in capacitance.
  • the process 800 continues at block 808.
  • the controller indicates that a spill-over or overflow condition has occurred.
  • the indication may be an electronic signal that is transmitted by the controller.
  • the process 800 continues at block 810.
  • the controller reduces the amount of heat supplied by a heating element of the appliance.
  • the indication of the spill-over condition sent by the controller may be a control signal that reduces or disconnects power to the heating element.
  • the condition remains asserted until it is reset.
  • a controller implemented in an appliance such as an inductive cooker may detect a spill-over condition and reduce the heat when such a spill-over condition is detected.
  • Embodiments of the present invention include various operations. These operations may be performed by hardware components, software, firmware, or a combination thereof.
  • the terms “coupled to” or “coupled with” may mean coupled directly or indirectly through one or more intervening components. Any of the signals provided over various buses described herein may be time multiplexed with other signals and provided over one or more common buses. Additionally,, the interconnection between circuit components or blocks may be shown as buses or as single signal lines. Each of the buses may alternatively be one or more single signal lines and each of the single signal lines may alternatively be buses.
  • Certain embodiments may be implemented as a computer program product that may include instructions stored on a computer-readable medium. These instructions may be used to program a general-purpose or special-purpose processor to perform the described operations.
  • a computer-readable medium includes any mechanism for storing or transmitting information in a form (e.g., software, processing application) readable by a machine (e g , a computer).
  • the computer-readable storage medium mav include, but is not limited to, magnetic storage medium (e.g., floppy diskette); optical storage medium (e.g., CD-ROM); magneto-optical storage medium; read-only memory (ROM); random-access memory (RAM); erasable programmable memory (e.g., FFROM and KKPROM); flash memory, or another type of medium suitable for storing electronic instructions.
  • the computer-readable transmission medium includes, but is not limited to. electrical, optical acoustical, or other form of propagated signal (e.g., carrier waves, infrared signals, digital signals, or the like), or another type o ⁇ medium suitable for transmitting electronic instructions.
  • some embodiments may be practiced in distributed computing environments where the computer readable medium is stored on and/or executed by more than one computer system.
  • the information transferred betw een computer systems may either be pulled or pushed across the transmission medium connecting the computer systems.
  • the operations * of the me ⁇ hod(s) herein ⁇ w shown and described in a particular order the order of the operations of each method may be altered so that certain operations may he performed in an inverse order or so that certain operation may be performed, at least in part, concurrently with other operations.
  • instructions or sub-operations of distinct operations may be in an intermittent and/or alternating manner.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cookers (AREA)

Abstract

L'invention concerne un procédé de détection de débordement d'une substance dans un appareil de chauffage, le procédé consistant à détecter un changement d'une capacitance d'un élément de capteur capacitif résultant de la proximité de la substance par rapport à l'élément de capteur capacitif, déterminer si le changement de la capacitance dépasse un seuil prédéterminé, et indiquer une condition de débordement en réponse à la détermination selon laquelle le changement de la capacitance dépasse le seuil prédéterminé.
PCT/US2010/033786 2009-05-05 2010-05-05 Procédé et système de détection de débordement WO2010129715A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010800290589A CN102461330A (zh) 2009-05-05 2010-05-05 溢出检测方法及系统

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US17570009P 2009-05-05 2009-05-05
US61/175,700 2009-05-05

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WO2010129715A1 true WO2010129715A1 (fr) 2010-11-11

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