WO2014155336A2 - Household appliance with a safety circuit - Google Patents

Household appliance with a safety circuit Download PDF

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Publication number
WO2014155336A2
WO2014155336A2 PCT/IB2014/060220 IB2014060220W WO2014155336A2 WO 2014155336 A2 WO2014155336 A2 WO 2014155336A2 IB 2014060220 W IB2014060220 W IB 2014060220W WO 2014155336 A2 WO2014155336 A2 WO 2014155336A2
Authority
WO
WIPO (PCT)
Prior art keywords
household appliance
connection
electric load
branch
ground
Prior art date
Application number
PCT/IB2014/060220
Other languages
French (fr)
Other versions
WO2014155336A3 (en
Inventor
Gianluca Viola
Marco PEDUTO
Mauro Possanza
Alberto CAMERIN
Simone Tordoni
Giacomo Marvardi
Nicola LADISA
Fabio Alessio Ughetto
Original Assignee
Indesit Company S.P.A.
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 Indesit Company S.P.A. filed Critical Indesit Company S.P.A.
Priority to EP14719100.1A priority Critical patent/EP2999389A2/en
Publication of WO2014155336A2 publication Critical patent/WO2014155336A2/en
Publication of WO2014155336A3 publication Critical patent/WO2014155336A3/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/087—Arrangement or mounting of control or safety devices of electric circuits regulating heat
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0049—Detection or prevention of malfunction, including accident prevention
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4285—Water-heater arrangements
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/46—Devices for the automatic control of the different phases of cleaning ; Controlling devices
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/42—Safety arrangements, e.g. for stopping rotation of the receptacle upon opening of the casing door
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
    • H02H3/162—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass for ac systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to mechanical injury, e.g. rupture of line, breakage of earth connection
    • 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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0258—For cooking
    • H05B1/0269—For heating of fluids
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/30—Variation of electrical, magnetical or optical quantities
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/06—Water heaters
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/44—Current or voltage
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/10—Power supply arrangements, e.g. stand-by circuits
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/04—Heating arrangements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/50—Responding to irregular working conditions, e.g. malfunctioning of blowers

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Power Engineering (AREA)
  • Food Science & Technology (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Cookers (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Breakers (AREA)

Abstract

Household appliance with a safety circuit, comprising at least one electrical load connected to a power mains supply, said at least one electrical load being provided with a ground connection branch, said household appliance further comprising a safety circuit provided with: a detection element associated with said ground connection branch and configured to detect a leakage current flowing in said ground connection; a comparison module configured to compare said leakage current with a preset threshold. Said module of comparison is further configured to disconnect said at least one electrical load from said power mains when the leakage current turns out to be higher than said preset threshold.

Description

"Household appliance with a safety circuit
DESCRIPTION
[TECHNICAL FIELD]
This invention relates to a household appliance with safety circuit .
[PRIOR ART]
As it is known, the household appliances are equipped, internally, of one or more electric loads that are suitably fed in order to contribute to the execution of the functions to which the household appliance is responsible.
By the way of an example may be considered the heating resistors present in the dishwasher and in washing machines, which have the task of heating the water used for the washing cycles.
Typically, these resistors comprise an internal metal filament, an intermediate coating made of electrically insulating material, and an external coating of a metallic material. The metallic coating is connected to ground.
A possible failure of the mentioned heating resistors occurs when, following a hole / tearing / breaking the intermediate coating, the internal filament comes into contact with the external metallic coating. In this circumstance, when the resistor is fed to perform its function of heating, the current through the metal filament is entirely ground dispersed through the mentioned connection to ground.
This can lead to an uncontrolled heating of the component, up to cause a fire.
According to the state of the art, if the equipment is fed by electrical power mains built and maintained according to the standards of safety requirements, a circumstance such as that briefly described above should be avoided by the security system that is part of the electrical power mains itself which, following a differential detection on the phase and neutral lines, recognizes the occurrence of a dangerous situation and cuts off the power supply to the household appliance.
However, there are circumstances where, for various reasons, this security system does not intervene, or is entirely absent.
The prior art therefore provides also additional safety systems mounted directly on the household appliances.
These additional safety systems are also based on differential phase-to-neutral detections.
The Applicant has noticed that the security systems that provide for a detection of the differential type are characterized by obvious operational problems.
First, this type of detection requires the reading of the current flowing in the two conductors, so that should be used two detecting elements, or a single detecting element (typically comprising a toroid of ferromagnetic material) of a particularly significant size. This clearly increases both the complexity and the costs of realization of this kind of security systems in addition to introducing positioning constraints by virtue of the size that the detecting element necessarily assumes.
Furthermore, in the case of single detecting element, having to be associated to the two phase and neutral conductors poses constraints to its positioning, typically being able to be positioned only on the power input of the household appliance, with this by creating constraints of considerable entity in the design phase and construction of the equipment.
[OBJECTIVES AND SYNTHESIS OF THE INVENTION]
Purpose of the present invention is therefore to provide a household appliance with safety circuit that allows to overcome the drawbacks pointed out above.
In particular, aim of the invention is to provide a household appliance equipped with a safety system supplementary to that in the power mains supply should itself be equipped. Another purpose of the invention is to provide a household appliance equipped with a safety system that is of simple realization .
A further purpose is to provide a household appliance equipped with a safety system that does not impose extremely stringent constraints, both in the design phase and in the construction phase, in terms of flexibility in the positioning of the electrical / electronic components.
These and still other purposes are substantially achieved by a household appliance with safety circuit as described in the attached claims.
In particular, according to a first aspect, object of the present invention is a household appliance with a safety circuit, comprising at least one electrical load connected to a power mains supply, said at least one electrical load being associated with a ground connection branch, said household appliance further comprising a safety circuit provided with:
a detection element associated with said branch and configured to detect a leakage current flowing in said branch;
- a comparison module configured to compare the leakage current with a preset threshold;
in which said comparison module is further configured to disconnect said at least one electrical load from the power mains when said leakage current turns out higher than said preset threshold.
Preferably, said comparison module is configured to disconnect said at least one electric load from both a phase line, and a neutral line, of said power mains supply.
Preferably, said household appliance is equipped with at least two connection terminals configured to be connected to the phase line and to the neutral line of said power mains supply.
Preferably, said at least one electric load has a first connection to one of said connection terminals through a first switch, and a second connection to the other connection terminal through a second switch.
Preferably, said comparison module is configured to open said first and second switches if said leakage current is higher than said preset threshold.
Preferably, said at least one electric load comprises a heating resistor to heat the wash water used by said household appliance in at least one wash cycle.
Preferably, said heating resistor comprises an internal metal filament, an intermediate coating made of electrically insulating material, and an external coating made of metallic material.
Preferably, the ground connection branch of said at least one electric load is a connection between said external coating and ground .
Preferably, said at least one electric load is a plurality of electric loads, each one having a first connection to one of said connection terminals through a respective main switch, and a second connection to the other connection terminal.
Preferably, the second connections of said electric loads are connected to the respective terminal of said household appliance through a common switch.
Preferably, said comparison module is configured to open said main switches and the common switch if said leakage current is higher than said preset threshold.
Preferably, each electric load has a connection to the ground connection branch.
According to another aspect, the object of the present invention is a filter for electric noise suppression, adapted for use in household appliance, said filter comprising:
- a first capacitor connected across connection terminals of said household appliance and adapted to filter differential mode noise ;
a second capacitor and a third capacitor respectively connected across a respective one of said connection terminals and a ground node, said second and third capacitor being adapted to filter noise to ground;
a detection element associated with a ground connection branch afferent to said ground node, said detection element being configured to detect a leakage current flowing in said branch, said detection element being adapted to cooperate with a comparison module of said household appliance.
According to a further aspect, the object of the present invention is a safety circuit suitable to be used in said household appliance .
[BRIEF DESCRIPTION OF THE DRAWINGS]
Some examples of preferred and advantageous embodiments are described by way of a non-limiting examples referring to the attached figures, in which:
- Figure 1 shows the block diagram of a first embodiment of an household appliance with safety circuit according to the present invention, in which some parts have been deleted to better illustrate others;
- Figure 2 shows the block diagram of a second embodiment of an household appliance with safety circuit according to the present invention, in which some parts have been deleted to better illustrate others;
- Figure 3 shows the block diagram of a modification of the embodiment of Figure 2.
[DETAILED DESCRIPTION OF THE INVENTION]
With reference to the attached figures, with number 1 has been indicated overall an household appliance with safety circuit according to the present invention.
By the way of an example, the household appliance 1 may be a dishwasher or a laundry washing machine.
In general, the household appliance 1 is a household appliance in which, for normative and / or security issues, at least one electric load is ground connected.
In more detail, the household appliance 1 comprises at least one electric load Ll-Ln. Figure 1 shows an embodiment in which there is a single electric load LI (constituted, as will be more clear in the following, by a heating resistor R) .
Figure 2 shows an embodiment in which there are several electric loads Ll-Ln.
By the way of an example, the electric load LI of the embodiment of Figure 1 can be one of the electric loads of the embodiment of Figure 2.
As mentioned above, the aforesaid at least one electric load Ll-Ln is associated to a ground connection branch 10.
In the embodiment of Figure 1, the branch 10 is constituted by a connection across the electrical load LI and the ground.
In the embodiment of Figure 2, the branch 10 is a branch to which direct ground connections Yl-Yn are afferent and coming from each electric load Ll-Ln.
In particular, the ground connection branch 10 and / or connections Yl-Yn have an end in contact with a metallic part of at least one electric load Ll-Ln.
According to this invention, the household appliance 1 has a safety circuit 20.
The safety circuit 20 has the task of disconnecting at least one electric load Ll-Ln from the power mains in case of a leakage current that flows in the branch 10 exceeds a determined threshold.
More particularly, the safety circuit 20 comprises a detection element 30 associated with the ground connection branch 10 and configured to detect a leakage current I flowing in said branch .
For example, the detection element 30 may be a current transformer or a shunt resistor.
In Figures 1 and 2 the detector element 30 is schematically represented as a toroidal element placed around the branch 10.
The safety circuit 20 also comprises a comparison module 40 to compare with a preset threshold the leakage current I detected by the detection element 30. The preset threshold can be defined both in hardware mode, that is, by setting a reference voltage through appropriate circuit elements dimensioned in an appropriate way, and in the software mode, that is programming a threshold value in a microprocessor that implements said comparison module.
In more detail, imagining of using a current transformer, provided with a primary winding associated with the toroid and a secondary winding, the resolution of the measurement can be defined by the number of turns of the secondary one.
The maximum measurable capacity depends on the toroid, in particular, the limit is given by the saturation of the toroid itself. Advantageously the saturation limit of the toroid is higher than the preset threshold of intervention that is set in the comparison module 40.
The preset threshold is a limit beyond which there is a real danger that can cause fires.
By the way of an example, the preset threshold may be comprised between 250 mA and 3A.
Therefore, in case the leakage current I exceeds the preset threshold, the comparison module 40 provides to disconnect at least one electric load Ll-Ln from the power mains.
In particular, the comparison module provides to disconnect at least one load Ll-Ln from both a phase line P, and a neutral line N of the power mains. In this way it is performed a protection with a so-called "bipolar" disconnection.
Preferably the household appliance 1 is equipped with at least two connection terminals Tl, T2 configured to be connected to the phase line P and to the neutral line N of the power mains. The terminals Tl, T2 can be part of or be included in an electrical plug 50, which is connectable to a socket connected to a power mains .
An input filter F (Figures 2, 3), which will be better described in the following, is associated to two connection terminals T1,T2. As schematically shown in figure 1, the electric load LI has a first connection CI which, through a first switch SI, connects the electric load LI itself to one of the two terminals Tl, T2, and a second connection C2, which, through a second switch S2 connects the electrical load LI to the other terminal.
When the comparison module 40 acts to disconnect the electric load LI from the power mains, it advantageously opens both the first switch SI, and the second switch S2, in order to perform the above mentioned bipolar disconnection.
As mentioned above, the electric load LI schematically represented in figure 1 may be a heating resistor Rl of the household appliance used to heat water used in one or more wash cycles .
In a preferred embodiment, the heating resistor R comprises an internal metal filament Rl, an intermediate coating R2 made of electrically insulating material, and an external coating R3 made of metallic material.
When, for some reason, the internal metal filament Rl is in contact with the external coating R3, for example, due to a breaking, a tearing and / or a hole of the intermediate coating R2, through the branch 10 flows a leakage current I of considerable entities (for example greater than 250 mA) and, following the measuring performed by the detection element 30, the comparison module 40 operates by disconnecting the electric load LI.
As above mentioned, in the embodiment of Figure 1, the branch
10 associated with the electric load LI is a connection across the outer coating R3 and ground.
With reference to the embodiment schematically illustrated in figure 2, the household appliance 1 comprises a plurality of electric loads Ll-Ln.
By the way of an example the electric loads Ll-Ln may comprise a heating resistor R (as in the embodiment shown in Figure 1), an electric motor which is part of the household appliance 1, In general, the loads Ll-Ln are electric loads which have at least a metallic part connected to the ground.
In the above example of an electric motor, the metallic part connected to the ground is represented from a group of little metal sheets of the stator.
Preferably each electric load Ll-Ln 10 is connected to the ground connection branch through a respective connection Yl-Yn.
Therefore the ground connections Yl-Yn of all electric loads Ll-Ln are afferent to the aground connection branch 10.
Preferably each electric load Ll-Ln has a first connection
Xl-Xn, through a respective main switch MSl-MSn, to one of the connection terminals Tl, T2, and a second connection Zl-Zn to the other connection terminal.
Preferably the latter connections Zl-Zn of the electric loads Ll-Ln are connected to the respective terminal Tl, T2 of the household appliance 1 through a common switch SX .
By way of an example, Figure 2 shows that the first connections Xl-Xn of the loads Ll-Ln are afferent to the second terminal T2, through the main switches MSl-MSn, while the second connections Zl-Zn are afferent to the first terminal Tl through the common switch SX .
When the comparison module 40 determines that the leakage current I flowing in the branch 10 is higher than the preset threshold, then provides for opening both the main switches MS1- MSn, and the common switch SX .
As mentioned above, the household appliance 1 is advantageously provided with a filter F (Figures 2, 3) .
The filter F is called a " machine filter ", i.e. a filter used for electric noise incoming in the household appliance from the power mains, and electric noise injected into the power mains from the household appliance itself.
The filter F preferably comprises a first capacitor CI in the class "X" which is connected between the two connection terminals Tl, T2. The first capacitor CI is adapted to filter differential mode noise .
The filter F preferably comprises a second capacitor C2 and a third capacitor C3, both in class "Y", respectively connected across the connection terminal Tl and ground, and across the connection terminal T2 and ground.
The second and third capacitor C2, C3 are adapted to filter noise to ground.
In the embodiment of figure 3, the detection element 30 is integrated in the filter F.
In particular, in the embodiment of Figure 3, the Yl-Yn connections coming from electric loads Ll-Ln are afferent to ground node N, to which the second and the third capacitor C2, C3 are also connected; from the ground node N then it develops the ground connection branch 10 on which operates the detection element 30.
This invention achieves important advantages.
Firstly, the household appliance according to this invention is equipped with an additional safety compared to the system that each power mains network should provide.
Moreover, the safety circuit in the electrical household appliance according to the present invention results simple and economical realization.
In addition to what is mentioned above, the safety circuit can be mounted inside the household appliance according to this invention with extreme flexibility, particularly with reference to the arrangement of the detection element.

Claims

1. A household appliance with a safety circuit, comprising at least one electric load (Ll-Ln) connected to an electric power mains, said at least one electric load (Ll-Ln) being associated with a ground connection branch (10), said household appliance
(1) further comprising a safety circuit (20) equipped with:
- a detection element (30) associated with said branch (10) and configured to detect a leak current (I) flowing in said branch (10) ;
- a comparison module (40) configured to compare said leak current (I) with a preset threshold;
wherein said comparison module (40) is also configured to disconnect said at least one electric load (Ll-Ln) from said power mains if said leak current (I) turns out to be higher than said preset threshold.
2. A household appliance according to claim 1, wherein said comparison module (40) is configured to disconnect said at least one electric load (Ll-Ln) from both a phase line (P) and a neutral line (N) of said power mains.
3. A household appliance according to any one of the preceding claims, which is equipped with at least two connection terminals (Tl, T2) configured to be connected to the phase line (P) and to the neutral line (N) of said power mains.
4. A household appliance according to claim 3, wherein said at least one electric load (Ll-Ln) has a first connection (CI) to one of said connection terminals (Tl, T2) through a first switch (SI), and a second connection (C2) to the other connection terminal through a second switch (S2) .
5. A household appliance according to claim 4, wherein said comparison module (40) is configured to open said first and second switches (SI, S2) if said leak current (I) is higher than said preset threshold.
6. A household appliance according to any one of the preceding claims, wherein said at least one electric load (Ll-Ln) comprises a heating resistor (R) to heat wash water being used by said household appliance (1) in at least one wash cycle.
7. A household appliance according to claim 6, wherein said heating resistor (R) comprises an internal metal filament (Rl), an intermediate coating (R2) made of electrically insulating material, and an external coating (R3) made of metallic material .
8. A household appliance according to claim 7, wherein the ground connection branch (10) of said at least one electric load (Ll- Ln) is a connection between said external coating (R3) and ground .
9. A household appliance according to any one of the preceding claims, wherein said at least one electric load (Ll-Ln) is a plurality of electric loads, each one having a first connection (Xl-Xn) to one of said connection terminals (Tl, T2) through a respective main switch (MSl-MSn) , and a second connection (Zl- Zn) to the other connection terminal.
10. A household appliance according to claim 9, wherein the second connections (Zl-Zn) of said electric loads (Ll-Ln) are connected to the respective terminal (Tl, T2) of said household appliance (1) through a common switch (SX) .
11. A household appliance according to claim 10, wherein said comparison module (40) is configured to open said main switches (MSl-MSn) and said common switch (SX) if said leak current (I) is higher than said preset threshold.
12. A household appliance according to any one of claims 9 to 11, wherein each electric load (Ll-Ln) has a connection (Yl-Yn) to said ground connection branch (10) .
13. A filter (F) for electric noise suppression, adapted for use in a household appliance (1) according to any one of the preceding claims, said filter (F) comprising:
- a first capacitor (CI) connected across connection terminals Tl, T2) of said household appliance (1) and adapted to filter differential mode noise; - a second capacitor (C2) and a third capacitor (C3), respectively connected across a respective one of said connection terminals (Tl, T2) and a ground node (N) , said second and third capacitors (C2, C3) being adapted to filter noise to ground;
- a detection element (30) associated with a ground connection branch (10) afferent to said ground node (N) , said detection element (30) being configured to detect a leak current (I) flowing in said branch (10), said detection element (30) being adapted to cooperate with a comparison module (40) of said household appliance (1) .
A safety circuit (20) adapted for use in the household appliance (1) according to any one of claims 1 to 12.
PCT/IB2014/060220 2013-03-28 2014-03-27 Household appliance with a safety circuit WO2014155336A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14719100.1A EP2999389A2 (en) 2013-03-28 2014-03-27 Household appliance with a safety circuit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000259A ITTO20130259A1 (en) 2013-03-28 2013-03-28 APPLIANCES WITH SAFETY CIRCUIT
ITTO2013A000259 2013-03-28

Publications (2)

Publication Number Publication Date
WO2014155336A2 true WO2014155336A2 (en) 2014-10-02
WO2014155336A3 WO2014155336A3 (en) 2014-12-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2014/060220 WO2014155336A2 (en) 2013-03-28 2014-03-27 Household appliance with a safety circuit

Country Status (3)

Country Link
EP (1) EP2999389A2 (en)
IT (1) ITTO20130259A1 (en)
WO (1) WO2014155336A2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016134776A1 (en) * 2015-02-26 2016-09-01 Arcelik Anonim Sirketi Polyphase electrical household appliance with improved safety and control method
EP3177104A1 (en) * 2015-12-02 2017-06-07 Whirlpool Corporation Diagnostic method for an electric heater
EP3175761A1 (en) * 2015-12-02 2017-06-07 Whirlpool Corporation Method for detecting a fault in an installed appliance

Family Cites Families (5)

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