WO2012049109A1 - Verfahren zum betreiben eines hausgeräts mit einem halbleiterschalter und mit einer steuereinheit zur funktionsprüfung des elektrischen halbleiterschalters und hausgerät - Google Patents
Verfahren zum betreiben eines hausgeräts mit einem halbleiterschalter und mit einer steuereinheit zur funktionsprüfung des elektrischen halbleiterschalters und hausgerät Download PDFInfo
- Publication number
- WO2012049109A1 WO2012049109A1 PCT/EP2011/067625 EP2011067625W WO2012049109A1 WO 2012049109 A1 WO2012049109 A1 WO 2012049109A1 EP 2011067625 W EP2011067625 W EP 2011067625W WO 2012049109 A1 WO2012049109 A1 WO 2012049109A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- semiconductor switch
- ignition
- time
- control unit
- current flow
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
-
- 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
- D06F33/00—Control of operations performed in washing machines or washer-dryers
- D06F33/30—Control of washing machines characterised by the purpose or target of the control
- D06F33/47—Responding to irregular working conditions, e.g. malfunctioning of pumps
-
- 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
- D06F2105/58—Indications or alarms to the control system or to the user
Definitions
- the present invention relates to a method for operating a household appliance, in particular for the care of laundry, in which with a control unit, a functional test or a check of proper operation of a household appliance included semiconductor electrical switch, in particular for functional testing of a triac of the household appliance occurs. Furthermore, the invention relates to household appliance for carrying out such a method.
- a monitoring circuit for the control of an electric motor of a washing machine is known, for example, from DE 197 33 533 C2, in which a control unit controls the engine speed via a semiconductor switch connected in series with the electric motor on the supply network and evaluates the actual speed via a tachometer. It can be determined by means of a circuit based on their output voltage, whether the semiconductor switch is fully functional or not, for example, whether the semiconductor switch has a short circuit or not. This is made possible by a resistance which connects the above circuit to a mains connection and thus results in the occurrence of an electrical voltage at the input of the circuit.
- the control unit can evaluate this output voltage and possibly directly deduce a malfunction, such as, in particular, a short circuit of the semiconductor switch.
- the present invention has for its object to provide a method and a domestic appliance for performing the method with which a rapid detection of an error function of the semiconductor switch, especially during operation of the semiconductor switch having domestic appliance is enabled, thus ensuring safe operation of the domestic appliance to ensure.
- This object is achieved by a method with the features according to claim 1 and the domestic appliance with the features of claim 9.
- Advantageous embodiments of the method are specified in the dependent claims.
- Advantageous embodiments of the method also give advantageous embodiments of the domestic appliance and vice versa.
- An inventive method for operating the domestic appliance is designed for functional testing of a semiconductor electrical switch whose control terminal is subjected to an ignition timing by means of a control unit with an ignition pulse.
- a current flow time at which the current strength of the current flowing through the semiconductor switch leaves the value zero, detected and a time difference between the ignition and the current flow time is evaluated for functional testing of the semiconductor switch.
- a basic idea of the invention thus relates to two points in time, an ignition point at which the semiconductor switch is driven, and a current flow time at which the semiconductor switch actually conducts or the course of the current intensity of the current flowing across the semiconductor switch passes zero to set each other and to evaluate the time difference between the two times.
- the semiconductor switch regardless of the presence of a speed sensor and regardless of the frequency of a supply voltage to which the semiconductor switch is connected, take place.
- the semiconductor switch can also be monitored during operation for an error function, thereby increasing the operational safety of a domestic appliance having the semiconductor switch.
- By evaluation of the Time difference it is also possible to detect short-term or short-term losses of the blocking capability of the semiconductor switch, which can lead to speed fluctuations of the drive motor. It is precisely these brief losses of the blocking capability of the semiconductor switch that can not be detected by the known methods.
- the inventive method the speed fluctuations caused by the short-term losses of the blocking capability can be compensated by appropriate regulation.
- the ignition timing and the current flow time are normalized with respect to half a period of a mains voltage at which the semiconductor switch is applied. Then, the time difference between the ignition and the current flow time is normalized based on half the period of the mains voltage.
- a normalized target firing angle of the semiconductor switch is compared with an actually measured normalized actual firing angle, and a firing angle difference between the target firing angle and the actual firing angle is calculated. It can thus be recognized the loss of the blocking capability of the semiconductor switch within a network half-wave.
- the time difference is compared with a reference value stored in the control unit. Then, a malfunction of the semiconductor switch is detected when the time difference exceeds the reference value.
- the reference value used is preferably a value which is determined by physical properties of the semiconductor switch. If the time difference is normalized in relation to half the period of the mains voltage, the reference value is, according to experience, about 1%, which, however, depends on the respective physical properties of the semiconductor switch. When determining the reference value, reaction times or response times which are required for the evaluation of the current flowing through the semiconductor switch or a motor current can also be taken into account.
- a drive motor of a domestic appliance in particular for the care of laundry items, is controlled by the semiconductor switch.
- the invention further relates to a domestic appliance with a control unit for carrying out the method according to the invention, wherein the domestic appliance is equipped in particular for the care of laundry items.
- a control unit comprises a semiconductor electrical switch, whose control terminal can be acted upon by an ignition pulse by means of the control unit, a time detection unit, with which a current flow time at which the current of the current flowing through the semiconductor switch leaves zero, and a time difference between the Ignition point and the current flow time can be detected, and an evaluation unit, with which an error signal can be generated depending on the current flow time and the time difference.
- the household appliance is preferably provided with a drive motor and with the control unit, wherein the semiconductor switch for driving the drive motor is connected to the drive motor.
- the figure shows in its upper part a time course 1 of a mains voltage u (t) at which a triac is applied to drive a drive motor of a washing machine, as well as a time course 2 of a motor current i (t).
- On the x-axis is the Time t applied.
- In the lower part of the figure represents a series of ignition pulses 3, which are delivered to a control terminal of the triac with a time delay. By the ignition pulses of the triac is turned on. If the triac functions properly, it is to be expected that after ignition of the triac by the emission of an ignition pulse 3, the motor current i (t) will flow until it reaches the value zero. After a firing pulse 3, the motor current i (t) should thus hold itself.
- the course 1 of the mains voltage u (t) begins in the figure with a first zero crossing (n-1), passes after the period of half a power line, a second zero crossing (n) and ends after the duration of a complete power wave or after passing a third Zero crossing (n + 1). The method is thus explained on the basis of a complete period of the mains voltage.
- a first pulse 3 is sent to an ignition point ti at the control terminal of the triac delivered and the triac is ignited.
- the motor current i (t) starts to flow.
- the time difference Et depends on the physical properties of the triac.
- the time shift between the ignition of the triac and the beginning of the current flow i (t) can also be explained by means of ignition angles.
- a nominal ignition angle is calculated for the activation of the triac for each mains half-wave, which is normalized in relation to the duration of half a mains current.
- the normalized desired ignition angle a SO ii, norm (n), which defines the time ti, is shown in the figure.
- the desired firing angle a so n, norm (n) can now be compared with a measured standardized actual firing angle a is t, n orm (n).
- the actual firing angle a is t, norm (n) by a time difference between the second zero crossing (n) of Mains voltage u (t) and the current flow time t 2 based on half a period of the mains voltage u (t) defined. If one now compares the desired firing angle a so n, norm (n) with the actual firing angle a is t, n orm (n), then the difference between the two angles equals the time difference A t.
- the time difference A t is compared with a reference value stored in a memory of a control unit.
- This reference value is defined as a function of the physical properties of the triac and of the response time of the motor current evaluation.
- the reference value can be determined, for example, by experiments or by a mathematical model. If the measured time difference ⁇ t deviates from the reference value, in particular if it exceeds the reference value, then an error function of the triac can be deduced.
- an ignition pulse is emitted to the control terminal of the triac, by which the triac is to be turned on.
- the course 2 of the motor current i (t) already passes the value zero at a current flow time t 4 before the ignition time t 3 .
- the current flow i (t) should be blocked by the triac after the zero value has been reached, and only after another ignition pulse 3 has occurred. This is not the case in the figure during the period of the second half wave.
- the time difference A t between the ignition time t 3 and the current flow time t 4 which is now significantly greater than the time difference A t during the time period of the first half-wave, immediately indicates that an error function of the triac occurs.
- the time difference ⁇ t can also be calculated based on firing angles, ie as a difference between a normalized nominal firing angle a as n, norm (n + i) and a measured normalized actual firing angle a is t , n orm ( n + i ) -
- a maximum firing angle ie a standardized firing angle of 100%
- the target ignition angle can be increased stepwise to the maximum ignition angle.
- An error function of the triac can then be recognized again as soon as a lower load torque leads to an ignition angle smaller than the maximum ignition angle.
- the method described above can also be used during engine standstill or even during a motor run-out, ie when no ignition of the triac occurs.
- the target ignition angle is zero, so that a short-term current flow due to the loss of the blocking capability of the triac and thus an error function of the same can be detected.
- the method according to the invention offers a functional test, which is favorable in comparison to the prior art, of a semiconductor electrical switch of a domestic appliance, in particular of a triac. Namely, the method does not require a speed sensor, as used for example as a speedometer in the prior art. It should also be mentioned at this point that the method can also be used independently of the frequency of the mains voltage u (t) and independently of frequency fluctuations. Even short-term or short-term losses of the blocking capability of the triac, which usually lead to speed fluctuations of the drive motor can be detected by the method according to the invention.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112011103426T DE112011103426A5 (de) | 2010-10-11 | 2011-10-10 | Verfahren zum Betreiben eines Hausgeräts mit einem Halbleiterschalter und mit einer Steuereinheit zur Funktionsprüfung des elektrischen Halbleiterschalters und Hausgerät |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010042292A DE102010042292A1 (de) | 2010-10-11 | 2010-10-11 | Verfahren zur Funktionsprüfung eines elektrischen Halbleiterschalters, Steuereinheit zur Durchführung des Verfahrens und Hausgerät mit einer solchen Steuereinheit |
DE102010042292.4 | 2010-10-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012049109A1 true WO2012049109A1 (de) | 2012-04-19 |
Family
ID=44773080
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2011/067625 WO2012049109A1 (de) | 2010-10-11 | 2011-10-10 | Verfahren zum betreiben eines hausgeräts mit einem halbleiterschalter und mit einer steuereinheit zur funktionsprüfung des elektrischen halbleiterschalters und hausgerät |
Country Status (2)
Country | Link |
---|---|
DE (2) | DE102010042292A1 (de) |
WO (1) | WO2012049109A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019106787B3 (de) | 2019-03-18 | 2020-08-13 | Webasto SE | Verfahren zur Überprüfung eines Halbleiterschalters auf einen Fehler |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3743396A1 (de) * | 1987-12-21 | 1989-06-29 | Bosch Siemens Hausgeraete | Verfahren und schaltungsanordnung zum schutz eines drehzahlgesteuerten waschmaschinen-antriebsmotors |
DE19733533C2 (de) | 1997-08-02 | 2000-01-27 | Ako Werke Gmbh & Co | Überwachungsschaltung für die Steuerung eines Elektromotors, insbesondere Wäschetrommelmotors |
WO2005101606A1 (de) * | 2004-04-13 | 2005-10-27 | C. & E. Fein Gmbh | Reihenschlussmotor und verfahren zum steuern eines solchen |
EP2020721A2 (de) * | 2007-08-03 | 2009-02-04 | BSH Bosch und Siemens Hausgeräte GmbH | Schaltungsanordnung zur Überwachung einer Tachoeinrichtung für einen Antriebsmotor einer Trommel einer Waschmaschine |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1639305A1 (de) * | 1968-02-21 | 1971-02-11 | Licentia Gmbh | Verfahren zum Messen der Mindestzuendimpulsdauer zum Durchschalten von Thyristoren |
DE4301605C1 (de) * | 1993-01-22 | 1994-05-26 | Daimler Benz Ag | Verfahren und Anordnung zum Überwachen des Ein- und Ausschaltens eines steuerbaren Leistungshalbleiterbauelements in einer leistungselektronischen Schaltung |
US6405154B1 (en) * | 1999-12-29 | 2002-06-11 | General Electric Company | Method and apparatus for power electronics health monitoring |
-
2010
- 2010-10-11 DE DE102010042292A patent/DE102010042292A1/de not_active Withdrawn
-
2011
- 2011-10-10 WO PCT/EP2011/067625 patent/WO2012049109A1/de active Application Filing
- 2011-10-10 DE DE112011103426T patent/DE112011103426A5/de not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3743396A1 (de) * | 1987-12-21 | 1989-06-29 | Bosch Siemens Hausgeraete | Verfahren und schaltungsanordnung zum schutz eines drehzahlgesteuerten waschmaschinen-antriebsmotors |
DE19733533C2 (de) | 1997-08-02 | 2000-01-27 | Ako Werke Gmbh & Co | Überwachungsschaltung für die Steuerung eines Elektromotors, insbesondere Wäschetrommelmotors |
WO2005101606A1 (de) * | 2004-04-13 | 2005-10-27 | C. & E. Fein Gmbh | Reihenschlussmotor und verfahren zum steuern eines solchen |
EP2020721A2 (de) * | 2007-08-03 | 2009-02-04 | BSH Bosch und Siemens Hausgeräte GmbH | Schaltungsanordnung zur Überwachung einer Tachoeinrichtung für einen Antriebsmotor einer Trommel einer Waschmaschine |
Also Published As
Publication number | Publication date |
---|---|
DE112011103426A5 (de) | 2013-08-22 |
DE102010042292A1 (de) | 2012-04-12 |
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