EP2484007B1 - Verfahren zum betreiben eines haushaltsgeräts und haushaltsgerät zur durchführung des verfahrens - Google Patents

Verfahren zum betreiben eines haushaltsgeräts und haushaltsgerät zur durchführung des verfahrens Download PDF

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Publication number
EP2484007B1
EP2484007B1 EP10765593.8A EP10765593A EP2484007B1 EP 2484007 B1 EP2484007 B1 EP 2484007B1 EP 10765593 A EP10765593 A EP 10765593A EP 2484007 B1 EP2484007 B1 EP 2484007B1
Authority
EP
European Patent Office
Prior art keywords
household appliance
discharging
capacitance
discharging element
discharge
Prior art date
Legal status (The legal status 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 status listed.)
Not-in-force
Application number
EP10765593.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2484007A1 (de
Inventor
Andreas Brunner
Thomas Pisek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2484007A1 publication Critical patent/EP2484007A1/de
Application granted granted Critical
Publication of EP2484007B1 publication Critical patent/EP2484007B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/664—Aspects related to the power supply of the microwave heating apparatus

Definitions

  • the invention relates to a method for operating a household appliance and a household appliance, which is set up for carrying out the method.
  • the household appliance may in particular be an oven, e.g. with a microwave function.
  • Microwave ovens typically include a noise filter that includes known X2 and Y2 capacitors with relatively large capacitances that are charged to mains voltage of a utility grid.
  • the capacitances should be discharged to a small voltage within a short time, after has been disconnected from the supply network by pulling a mains plug.
  • an ohmic discharge resistor has hitherto been used, e.g. with a resistance of 75 k ⁇ .
  • the discharge resistor is wired between a phase and a neutral of the microwave oven and is constantly under mains voltage.
  • a current ('discharge current') is constantly flowing through the discharge resistor, and a power loss is constantly being implemented, typically in a range of several 100 mW.
  • EP1605556 A1 discloses an AC plug having a plug housing with two pins, wherein in the plug housing a discharge resistor is present, which is connected between the pins, for discharging a residual charge between the pins when the pins are pulled out of a terminal socket. Also included in the connector housing is a switch which turns off when the terminal pins are inserted into a terminal socket and turns on when the terminal pins are withdrawn from the terminal socket to guide the residual charge of one terminal pin through the discharging resistor to the other terminal pin ,
  • the object is achieved by a method for operating a household appliance, wherein the household appliance has at least one detachable network connection to a supply network, an interference filter with at least one capacitor and at least one discharge element for discharging the at least one capacitor.
  • the at least one discharge element upon release of the network connection, the at least one discharge element is switched on for discharging the at least one capacity.
  • a discharge current does not permanently flow, but only briefly when activated if necessary.
  • the power loss of several 100 mW continuously generated by the previously used discharge resistor can be avoided, especially in a standby mode.
  • the at least one capacitance may include, for example, the X2 and Y2 capacitors for the noise filter.
  • the at least one discharge element comprises at least one consumer, which is turned on during normal operation of the household appliance.
  • the consumer need not be constantly turned on during normal operation, but it is sufficient that it can be switched on during a normal operation of the household appliance or can be switched on.
  • a discharge current of the noise filter also flows through the consumer, but firstly with an AC voltage applied to the phase and the neutral conductor only periodically and secondly only when the consumer is switched on.
  • the power of the capacity (s) flows back into the supply network.
  • the consumer only during certain modes and / or sensor-dependent, e.g. temperature dependent, is switched on.
  • the method is not limited to energy converters such as motorized components and / or radiators.
  • the at least one discharge element may e.g. also a passive device, e.g. a load, such as a dedicated discharge resistor.
  • a passive device e.g. a load, such as a dedicated discharge resistor.
  • the nature of the discharge element is not limited.
  • the at least one discharge element comprises a fan.
  • a fan is particularly suitable for rapid discharge, since he or his fan motor has a low resistance, is usually switched on individually and is non-safety critical in operation.
  • the at least one discharge element comprises a circulation fan or its circulating air motor.
  • the circulating air blower is particularly present in most furnaces, so that only a small adaptation performance in the implementation of the discharge via the circulating air blower needs to be done for different devices.
  • any other suitable fan may be used, e.g. a steam fan, a cooling fan, etc.).
  • an antenna motor may also be used as a discharge element.
  • radiators are basically suitable as discharge elements, depending on the type of oven, e.g. Top heaters, bottom heaters, hot air heaters, grill heaters, etc.
  • the discharge element is turned on for a predetermined period of time. As a result, a defined operating state of the discharge element can be achieved after a renewed connection to the supply network.
  • the household appliance for discharging the at least one capacity provides a minimum switch-on duration for the discharge element of less than 1 s.
  • the discharge element is capable of discharging the capacities to a non-critical level within this second, e.g. to below 34 volts. This, in turn, causes a user to be very likely to be protected from electric shock by the capacitors at the latest after one second, e.g. when touching the contacts of a pulled power plug.
  • the household appliance for discharging the at least one capacity provides a minimum duty cycle for the unloading of less than 100 ms.
  • the unloading element is capable of discharging the capacities to a non-critical level within this tenth of a second. This further increases the operational safety for a user.
  • the household appliance for discharging the at least one capacity a minimum duty cycle for the discharge of less than 25 ms, eg for approx. 20 ms. As a result, the reliability for a user is further increased.
  • the discharge member is capable of reducing the capacity (s) within the predetermined minimum duty cycle to the predetermined amount, e.g. Voltage level, to discharge, a longer discharge time can further reduce the voltage.
  • the release of the network connection is detected by a lack of at least one network connection-dependent signal.
  • the network connection dependent signal is a signal that can be present or generated when there is a network connection and is absent if the network connection is or is released.
  • the network connection dependent signal may e.g. be a network synchronous signal, in particular a network synchronous square wave signal.
  • a network-dependent periodic signal and / or a network-dependent non-periodic signal (eg a DC voltage level generated from the mains voltage) may be used.
  • the disconnection of the network connection can in particular be detected by a logic circuit (microcontroller, processor, ASIC, FPGA, etc.), in particular if such a logic circuit already uses a network connection dependent signal (e.g., the network synchronous square wave signal) for other purposes, so that an implementation overhead is low.
  • the logic circuit may be part of a central control circuit; the detection of the release of the network connection and the switching on of the at least one discharge element can then be carried out in particular by the same circuit.
  • a shutdown routine is performed upon detecting the release of the network connection, wherein the switching on the discharge element for discharging the capacitors of the noise filter is part of the shutdown routine.
  • the logic circuit uses an energy store which is present in the domestic appliance and is suitable for a sufficiently long operation of the logic circuit, for example a capacitor.
  • the object is also achieved by a household appliance, wherein the household appliance is set up for implementation.
  • the domestic appliance can, for example, have at least one detachable network connection to a supply network, an interference filter with at least one capacitance and at least one discharge element for discharging the at least one capacitance and be adapted to release the network connection toward the at least one discharge element for discharging the at least one capacitance turn. Only during this short time the discharge current flows. A constant current through a permanently suspended discharge resistor is avoided. Standby power consumption is significantly reduced.
  • the household appliance can be developed analogously to the embodiments of the method.
  • the household appliance may have a monitoring unit in one embodiment for detecting the release of the network connection.
  • the monitoring unit can be designed as one or with a logic circuit, in particular as part of a central control unit.
  • the logic circuit can be set up in particular for detecting the release of the network connection by a lack of at least one network connection-dependent signal, in particular a network-synchronous signal, in particular a network-synchronous square-wave signal.
  • the logic circuit a microcontroller, etc.
  • the logic circuit is thus detected by means of the network connection-dependent signal, whether the supply or mains voltage, and thus also the network connection, are present or not.
  • noise filter and the discharge element are connected in parallel between a phase and a neutral.
  • the discharge element is switched by a relay, alternatively by another switch such as a triac, etc.
  • the domestic appliance can be designed as a stove, in particular as a microwave oven (microwave stand-alone appliance, microwave oven / oven combination appliance, etc.).
  • a microwave oven microwave stand-alone appliance, microwave oven / oven combination appliance, etc.
  • the figure shows a section of a circuit diagram of a combined microwave oven / oven according to the invention.
  • the furnace has a phase P and a neutral N, between which several components are mounted.
  • a radio interference filter Z10 located between the phase P and the neutral conductor N is a radio interference filter Z10, which has various parallel-connected capacitances (without reference numerals), comprising an X2 capacity and a Y2 capacity.
  • the functioning of noise filters is well known.
  • a discharge resistor EW of dashed lines has been previously incorporated in the radio interference suppression filter Z10. 75 k ⁇ switched permanently parallel to the capacities. When releasing the network connection flows through the discharge resistor EW driven by the capacitive discharge current.
  • a disadvantage of the use of the discharge resistor EW is that in the presence of the mains voltage via the discharge resistor EW continuously a leakage current of, for example, 700 mW flows. This leakage current flows so even during a standby operation, in which the furnace is connected to the supply network, but is not operated in a mode.
  • the introduced food can be treated by microwaves and / or by heat.
  • a magnetron E8 is present, and to generate the heat, a bottom heat radiator E12, a grill element E17, a circulating air element E19 and another grill element E27 are present, which are respective power relays K17, K19, K39 and K27 are assigned.
  • the radiators E12, E17, E19 and E27 are also connected in series with two temperature limiter R14 and a cooking chamber lock Y3.
  • the cooking chamber lock Y3 is also connected to a temperature limiter R36 and also has two limit switches F31 and F32 for detecting a sitting of a cooking chamber door and a locking motor M10 for the cooking chamber door.
  • the cooking chamber lock Y3 is further equipped with a switch S13 for power switching.
  • the magnetron E8 is preceded by an inverter T20, which in turn is connected to a temperature limiter R7.
  • the magnetron E8 and an antenna motor M6 for rotating a microwave antenna are turned on together via a power relay K2.
  • the magnetron E8, the antenna motor M6 and the radiators E12, E17, E19 and E27 are also connected in series to a common power relay K51, so that each of these elements is protected by at least two switches.
  • a transformer T15 for operating an oven lamp E22 and a plurality of motors, namely a cooling fan motor M1, a circulating air motor M3 of a circulating air blower, a motor M4 of a steam blower and a motor M7 of a magnetron fan.
  • the transformer T15, the circulating air motor M3, the motor M4 of the fan-type fan and the motor M7 of a magnetron fan can be turned on by a respective relay K24, K15, K37 and K10, respectively, which are not power relays.
  • the cooling fan motor M1 can be switched on by means of two relays K36 or K09. All controllable relays K2, K17, K12, K39, K27, K51, K15, K37, K36, K10, K24 and K09 are housed on a common control board K138.
  • a switching power supply G1 is further arranged.
  • the discharge resistor EW is missing, as a result of which the associated leakage current no longer occurs.
  • the capacitances of the interference suppression filter Z10 are deliberately discharged by the circulating air motor M3 of the circulating air fan is switched on via relay K15 for approx. 20 ms. Only for this time, the discharge current flows. Since after the release of the network connection only a small amount of power is available for operation of the household appliance, the low-consumption switching of the circulating-air motor M3 by means of only a single relay is advantageous.
  • the switching is done by a control circuit, not shown, which is implemented in the form of a microcontroller.
  • the control circuit first detects the disconnection of the network connection by using a network connection dependent signal, e.g. a mains-synchronous square-wave signal fails, or generally changes its value. In this case, the time duration or the number of signals, from the absence of the release of the network connection is determined to be chosen differently depending on the interpretation.
  • the network-synchronous signal can also be used, for example, to clock a power supply to the radiators.
  • a shutdown routine takes place on the control circuit after or with the detection of the disconnection of the network connection, which as a part provides for switching on the circulating air motor M3 through the relay K15.
  • the furnace according to the invention has the advantage that no additional components are required for its implementation, but even the hard-wired discharge resistor can be saved. Thus, a permanent power loss is avoided by the discharge resistor in network connection.
  • the discharge may additionally or alternatively be via another of the motors and / or via one or more of the radiators. It is also basically possible to maintain the discharge resistance and to connect in series with a corresponding switch.
  • the circuit of the consumer does not need to be done via relays, but can be done via any other suitable switch such as triacs.
  • the invention is not limited to a furnace, but can be applied to any household appliances, such as refrigerators, washing machines, dishwashers, etc.
  • the release of the network connection can be effected for example by pulling a power plug.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Filters And Equalizers (AREA)
EP10765593.8A 2009-10-01 2010-09-22 Verfahren zum betreiben eines haushaltsgeräts und haushaltsgerät zur durchführung des verfahrens Not-in-force EP2484007B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910045242 DE102009045242A1 (de) 2009-10-01 2009-10-01 Verfahren zum Betreiben eines Haushaltsgeräts und Haushaltsgerät zur Durchführung des Verfahrens
PCT/EP2010/063981 WO2011039089A1 (de) 2009-10-01 2010-09-22 Verfahren zum betreiben eines haushaltsgeräts und haushaltsgerät zur durchführung des verfahrens

Publications (2)

Publication Number Publication Date
EP2484007A1 EP2484007A1 (de) 2012-08-08
EP2484007B1 true EP2484007B1 (de) 2013-07-31

Family

ID=43446634

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10765593.8A Not-in-force EP2484007B1 (de) 2009-10-01 2010-09-22 Verfahren zum betreiben eines haushaltsgeräts und haushaltsgerät zur durchführung des verfahrens

Country Status (4)

Country Link
EP (1) EP2484007B1 (zh)
CN (1) CN102549921B (zh)
DE (1) DE102009045242A1 (zh)
WO (1) WO2011039089A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104168679B (zh) * 2013-05-17 2016-02-10 美的集团股份有限公司 电磁炉及其放电方法
CN107942736B (zh) * 2016-10-12 2020-06-16 佛山市顺德区美的电热电器制造有限公司 一种控制方法、主控设备及过零点检测电路
CN106793220B (zh) * 2016-12-20 2023-02-03 珠海格力电器股份有限公司 电磁加热装置的电容放电方法、电路及电磁炉

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3641605B2 (ja) * 2001-09-28 2005-04-27 株式会社東芝 電気機器、加熱調理器、冷蔵庫及び洗濯機
DE10242158A1 (de) * 2002-09-11 2004-03-18 Adp Gauselmann Gmbh Verfahren zum Sichern eines Elektrogerätes, das an einer Netzleitung eines Wechselstromnetzes angeschlossen ist
JP2005353306A (ja) * 2004-06-08 2005-12-22 Sony Corp Ａｃプラグ、および、それを備える電気機器
CN101465548A (zh) * 2007-12-20 2009-06-24 王海 交流电容器的微功耗快速放电装置

Also Published As

Publication number Publication date
CN102549921B (zh) 2016-04-06
WO2011039089A1 (de) 2011-04-07
EP2484007A1 (de) 2012-08-08
DE102009045242A1 (de) 2011-04-21
CN102549921A (zh) 2012-07-04

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