EP3488042A1 - Türüberwachungsschaltung für ein haushaltsgerät - Google Patents
Türüberwachungsschaltung für ein haushaltsgerätInfo
- Publication number
- EP3488042A1 EP3488042A1 EP17739955.7A EP17739955A EP3488042A1 EP 3488042 A1 EP3488042 A1 EP 3488042A1 EP 17739955 A EP17739955 A EP 17739955A EP 3488042 A1 EP3488042 A1 EP 3488042A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- door
- input
- state
- relay
- monitoring circuit
- 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.)
- Granted
Links
Classifications
-
- 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
Definitions
- the invention relates to a door monitoring circuit for a household appliance with a transmitter input and a state transmitter, which is connected to the encoder input and represents the state of a loading door of the household appliance.
- the invention further relates to a household appliance with such a door monitoring circuit and a microprocessor.
- a known possibility of such precautions is to run the operating voltage of these units via a door switch, which interrupts the power supply to said units when the door is open.
- the switch must therefore be able to switch the corresponding load.
- the necessary supply voltage if necessary to lead over relatively long and sufficiently dimensioned lines.
- microprocessors to control household appliances offers the opportunity to realize extensive security functions.
- circuits are intrinsically safe to execute, i. It must be ensured that basic safety functions are available even if the microprocessor malfunctions.
- the invention provides a solution with which reliable but inexpensive to avoid the risks mentioned.
- a transmitter input, a state transmitter connected to the transmitter input and the accessory represents a loading door of the household appliance
- a HV relay input for controlling the door monitoring circuit with a HV relay control signal.
- a relay control output for controlling a mains switching relay of the household appliance
- a monitoring unit which is connected to the relay control output, the encoder input, the HV relay input and the door monitoring output provided, wherein Pol of the encoder input forms an input node, the is connected to the monitoring unit and the monitoring unit is adapted to control the relay control output in response to the HV relay control signal only when the state transmitter indicates that the loading door of the household appliance is closed.
- the mains switching relay which turns on the power supply for critical consumers such as heating, drive, fan, etc., only be switched when the loading door is closed .
- the direct hardware connection of the status transmitter and the mains switching relay via the monitoring unit ensures intrinsically safe operation regardless of the function of the home appliance controller.
- the state generator is connected via a pull-up resistor and a pull-down resistor between a supply voltage and ground.
- the state transmitter is thus integrated in a voltage divider, by means of whose potential not only the state of the state encoder, which represents the states of the loading door, can be determined, but also errors in the state sensor and its supply lines, such as e.g. Short circuit or interruption.
- the door monitoring circuit is equipped with a trigger input for actuating the door monitoring circuit by a microprocessor with a trigger signal which can change the state of the input node. It can thus be checked whether the condition sensor or the door monitoring circuit has hardware errors.
- a door signal output is provided, which provides a signal as a function of the state of the input node.
- the door monitoring circuit provides a circuit point at which can be queried by the control of the household appliance or by other units of the state of the loading door.
- the invention provides a home appliance having a door monitoring circuit and a microprocessor for driving the HV relay input and monitoring the door monitoring output.
- the microprocessor is further provided for controlling the trigger input in the household appliance.
- FIG. 1 is a schematic block diagram of a door monitoring circuit according to a first embodiment of the invention
- FIG. 2 shows a schematic flow diagram for the method according to the invention
- FIG. 3 is a schematic flow chart for a method according to a development of the invention.
- a first embodiment of a door monitoring circuit 10 for a household appliance is shown schematically.
- the door monitoring circuit has a transmitter input 12, a trigger input 14 and a HV relay input 16.
- the door monitoring circuit also has a door signal output 20 and a door monitoring output 22.
- a state encoder 30 is connected to the encoder input 12.
- the state generator 30 may be implemented in different ways; for example, as a simple door switch in the form of a closing contact 30a (in solid lines in FIG. 1) or as a hall sensor 30b (alternatively shown in dotted lines in FIG. 1).
- the state transmitter 30 indicates the state of a loading door of the household appliance, ie whether the door is open or closed.
- the closing contact 30a of the state encoder is closed when the loading door of the household appliance is closed.
- the door monitoring circuit 10 also has a trigger conditioning unit 40 with a trigger input 42 and a trigger output 44, a monitoring unit 50 with a relay drive input 52, a monitoring input 54, a relay control output 56 and a relay state output 58, and a door signal processing unit 60 with a door signal input 62 and a door signal output 54, on.
- the state generator 30 is connected between a first pole 12 a and a second pole 12 b of the encoder input 12.
- the first pole 12a is connected via a pull-up resistor 32 to a supply or reference voltage V S s of the door monitoring circuit 10th
- the second pole 12b is connected to an input node 36, which is connected via a pull-down resistor 34 to the ground GND of the door monitoring circuit 10.
- the trigger input 42 of the trigger conditioning unit 40 forms the trigger input 14 of the door monitoring circuit 10.
- the trigger output 44 of the trigger conditioning unit 40 is connected to the input node 36. Also connected to the input node 36 is the door signal input 62 of the door signal conditioning unit 60, and the door signal output 64 of the door signal conditioning unit 60 forms the door signal output 20 of the door monitoring circuit 10.
- the monitoring input 54 is also connected to the input node 36.
- the relay drive input 52 of the monitoring unit 50 forms the HV relay input 16 of the door monitoring circuit 10 and the relay state output 58 of the monitoring unit 50 forms the door monitoring output 22 of the door monitoring circuit 10.
- the relay control output 56 of the monitoring unit 50 controls a mains switching relay 70 at.
- the mains switching relay 70 is connected to a phase P of a mains supply voltage in order, via a switching contact 72, to connect a switched mains supply voltage P1 for consumers with mains voltage demand in the domestic appliance, such as e.g. Heater, drive motor, etc. on and off.
- the core of the door monitoring circuit 10 is the input node 36 and its electrical level. This level and its dependence on the state of the loading door of the household appliance should initially be considered without consideration of the function of the trigger conditioning unit 40. If the closing contact 30a of the state transmitter is open, which in the illustrated embodiment corresponds to an open loading door, the level of the input node 36 is approximately at ground potential GND because of the connection via the pull-down resistor 34. Similarly, the state of the input node 36 would be coupled to the state of the loading door in the alternative use of a Hall sensor 30b as a state transmitter.
- the closing contact 30a of the status transmitter is closed.
- the level is a result, pulled up at the input node 36 via the pull-down resistor 34 to the value of the supply voltage V S s back, wherein the actually applied level is substantially the ratio of the resistance values of the pull-up resistor 32 and pull-down Resistor 34, which form a voltage divider.
- the level at the input node 36 is still dependent on the status of a trigger signal MAIN_TRIGGER at the trigger input 14 during operation of the household appliance.
- the trigger signal is provided in the simplest case by the microprocessor 80 at the trigger input 14.
- the trigger signal is processed in the trigger conditioning unit 40, for example in the form of a level adjustment, an inversion, a D / A conversion or a combination thereof.
- the trigger conditioning unit 40 can also be designed to generate the trigger signal per se, controlled by a digital or analog control signal at the trigger input 14.
- the trigger input 14 is driven at the clock of the main routine of the microprocessor 80 and may take the status MAIN_TRIGGER_ON or MAIN_TRIGGER_OFF.
- the electrical level of the input node 36 can be influenced via the trigger input 14, in such a way that the level depends both on the status of the trigger signal MAIN_TRIGGER as well as the state of the state transmitter 30 and thus in the illustrated embodiment, the state of the loading door.
- the state of the input node 36 is polled by the microprocessor 80 at the door signal output 20.
- the signal at the door signal output 20 is conditioned by the Mossignalaufkungs- unit 60 so that it can be evaluated by an analog input of the microprocessor 80.
- the treatment can alternatively also be used for another purpose.
- se to the door signal output 20 connected detection or control device be provided and include, for example, a level adjustment, an inversion, an A / D conversion or a combination thereof.
- the conditioning may also be implemented in whole or in part in the microprocessor 80.
- the microprocessor 80 can detect both the state of the status transmitter 30, which represents the state of the loading door, and read back the status of the trigger signal MAIN_TRIGGER.
- the monitoring unit 50 controls the mains switching relay 70 which can connect and disconnect a power supply for consumers with mains voltage requirement in the household appliance, such as heating, drive motor, etc.
- the mains switching relay 70 is controlled by the monitoring unit 50 with a relay supply voltage V H VR at the relay control output 56.
- the relay supply voltage V H VR that is provided to the monitoring unit 50 can advantageously be a PWM-modulated voltage in order to keep the power loss in the mains switching relay 70 low, in particular when the mains switching relay 70 only operates after switching still requires a lower holding current.
- the monitoring unit 50 with its monitoring input 54 also detects the state of the input node 36.
- the microprocessor 80 controls in principle the switching on and off of the mains switching relay 70 and thus the mains voltage supply for the said consumers.
- the monitoring unit 50 also ties the release of the mains switching relay 70 to the state of the input node 36, in such a way that when the loading door of the household appliance open the mains switching relay 70 can not be switched and thus also prevents that in this case Mains voltage for the operation of critical consumers such as heating, drive, blower or similar is available.
- This hardware monitoring function thus provides an additional assurance that with the door open, none of the critical consumers can be in operation. Furthermore, by means of this monitoring function in the illustrated embodiment, an optional check of the function of the microprocessor is realized, which is described below.
- the microprocessor 80 may provide trigger signal MAIN_TRIGGER at trigger input 14, as described above.
- Missing the trigger signal for example, because the microprocessor 80 fails, then blocks the monitoring unit 50, the control of the mains switching relay 70, so that it is prevented that the mains voltage for the operation of critical consumers is available. Failure of the microprocessor 80 that is detected may result in a physical failure or in the software not timing and / or logic running incorrectly, for example due to a ROM error or improper timing.
- the microprocessor 80 can also determine, using the trigger signal MAIN_TRIGGER, whether the signal chain from the state transmitter 30 to the input node 36 has certain errors, for example an interruption or a short circuit. Namely, if the microprocessor 80 provides a trigger signal MAIN_TRIGGER at the trigger input 14, then the state of the input node 36 also changes in response to this trigger signal MAIN_TRIGGER. In one of these errors, the state of the input node 36 does not correspond to one of the expected values due to the state of the state encoder, the pull-up resistor 32 and the pull-down resistor 34, and the state of the trigger signal MAIN_TRIGGER would. By comparing the signal ADC_DOOR at the door signal output 20 with predetermined limit values, the microprocessor 80 can thus determine whether an error exists.
- the monitoring unit 50 at the relay state output 58 provides an analog signal to the microprocessor 80 which depends on the state of the input node 36, as well as the presence of a HV relay control signal HVR_ON at the HV relay input 16 and the relay supply voltage V H VR and which the Microprocessor 80 for monitoring the proper control of the mains switching relay 70 is used.
- the signal to the microprocessor 80 at the relay state output 58 is conditioned, eg, with a low pass, so that it is a static signal even when the relay supply voltage V H VR is a PWM modulated voltage.
- the signal ADC_9V_DOOR at the relay state output 58 indicates to the microprocessor 80 whether the mains switching relay 70 is switched or not.
- the operation of the door monitoring circuit 10 will be clarified below in connection with the description of a method of a door test routine that can be performed by the door monitoring circuit 10 and which is described below with reference to the schematic flow diagram in FIG.
- the sequence of the function of the door monitoring circuit is controlled by the microprocessor of the household appliance.
- the microprocessor 80 may begin the door test routine start 102 at a defined time, provided that the necessary supply voltages are provided to the door monitoring circuit 10.
- the microprocessor 80 reads out a configuration stored in the device in an initialization step 104.
- the configuration includes information about the door monitoring circuit 10 necessary to perform the door test routine. This can be information about which door status sensor 30 is installed in the device, that is, for example, a simple door switch 30a or a Hall sensor 30b. Furthermore, information on limit values for status signals to be interrogated can be stored.
- a first step 110 the microprocessor switches off the trigger signal MAIN_TRIGGER for a time T traff .
- a second step 12 the microprocessor checks whether the analog signal ADC_DOOR present at the door signal output 20 lies between a lower limit open_low_level_Toff and an upper limit open_high_level_Toff for an opened door. This is not true. the microprocessor jumps to a fifth step 1 18. If this is the case, then the microprocessor checks in a third step 1 14, if the present at the door monitoring output 22 analog signal ADC_9V_DOOR is less than the maximum limit adc_max_door_opened for an open door. If this is not the case, the microprocessor ends the door monitoring and outputs an error in a last step 128.
- a fourth step 16 the microprocessor determines that the door is open by setting the DOOR_OPENED guard value to 1, and continues the door monitoring with an eighth step 124.
- the microprocessor checks whether the analog signal ADC_DOOR applied to the door signal output 20 is between a lower limit closed_low_level_Toff and a closed_high_level_Toff upper limit Door is located. If this is not the case, the microprocessor ends the door monitoring and outputs an error in a last step 128.
- the microprocessor checks whether the analogue signal ADC_9V_DOOR present at the door monitoring output 22 lies between a lower limit value adc_min_door_closed and an upper limit value adc_max_door_closed for a closed door.
- the microprocessor ends the door monitoring and outputs an error in a last step 128. If this is the case, however, then in a seventh step 122, the microprocessor determines that the door is closed by setting the DOOR_OPENED guard value to 0, and continues door monitoring with an eighth step 124.
- the microprocessor turns on the trigger signal for a time T tron and proceeds to a ninth step 126.
- the microprocessor checks whether the analog signal ADC_DOOR applied to the door signal output 20 either between a lower limit open_low_level_Ton and an upper limit open_high_level_Ton for an open Door or between a lower limit closed_low_level_Ton and an upper limit closed_h ig h_leve! _Ton for a closed door.
- the microprocessor ends the door monitoring and in a last step 128 issues an error. However, if one of the two conditions applies, the microprocessor restarts the door monitoring cycle with the first step.
- the microprocessor 80 checks the door monitoring circuit 10 for hardware errors once prior to executing the above-described routine, preferably after switching on the device. This function is described below with reference to the flow chart in FIG.
- the trigger signal MAIN_TRIGGER turned off and checked in a loop 148 during a period T, whether that at the door monitoring output 22 adjacent analog signal ADC_9V_DOOR is less than a limit ADOR_max_startup.
- the microprocessor 80 continues the door test routine with the first step 110.
- the microprocessor 80 ends the door test routine and outputs an error in a final step 150.
- the time period T is chosen to ensure that all necessary supply voltages are available to the door monitoring circuit 10, but that the execution of the door test routine is not unnecessarily delayed.
- the time T is set at 500 ms.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Selective Calling Equipment (AREA)
- Power-Operated Mechanisms For Wings (AREA)
- Alarm Systems (AREA)
- Control Of Washing Machine And Dryer (AREA)
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL17739955T PL3488042T3 (pl) | 2016-07-19 | 2017-07-11 | Układ monitorowania drzwi do urządzenia gospodarstwa domowego |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102016213136.2A DE102016213136A1 (de) | 2016-07-19 | 2016-07-19 | Türüberwachungsschaltung für ein Haushaltsgerät |
| PCT/EP2017/067396 WO2018015212A1 (de) | 2016-07-19 | 2017-07-11 | Türüberwachungsschaltung für ein haushaltsgerät |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3488042A1 true EP3488042A1 (de) | 2019-05-29 |
| EP3488042B1 EP3488042B1 (de) | 2020-09-09 |
Family
ID=59350915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17739955.7A Active EP3488042B1 (de) | 2016-07-19 | 2017-07-11 | Türüberwachungsschaltung für ein haushaltsgerät |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP3488042B1 (de) |
| CN (1) | CN109477280B (de) |
| DE (1) | DE102016213136A1 (de) |
| PL (1) | PL3488042T3 (de) |
| WO (1) | WO2018015212A1 (de) |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4106009C1 (de) * | 1991-02-26 | 1992-08-13 | Elge Elektronik-Geraetewerk Gmbh & Co, 8819 Schopfloch, De | |
| KR940007232B1 (ko) * | 1991-12-31 | 1994-08-10 | 대우전자 주식회사 | 전자렌지의 도어 개폐장치 |
| CN1548625A (zh) * | 2003-05-12 | 2004-11-24 | 乐金电子(天津)电器有限公司 | 洗衣机的上开门感应电路 |
| DE102007037767A1 (de) * | 2007-02-26 | 2008-08-28 | Diehl Ako Stiftung & Co. Kg | Gerät mit ansteuerbarer Schutzeinrichtung |
| DE102007058376C5 (de) * | 2007-12-05 | 2012-09-06 | BSH Bosch und Siemens Hausgeräte GmbH | Schaltungsanordnung zum Betreiben eines Hausgeräts |
| CN102024306B (zh) * | 2010-10-29 | 2016-04-27 | 海尔集团公司 | 一种洗衣机门盖检测电路 |
| DE102012016412A1 (de) * | 2011-10-11 | 2013-04-11 | Diehl Ako Stiftung & Co. Kg | Schaltungsanordnung und Verfahren zum Betreiben eines Haushaltungsgerätes |
| EP3044396A4 (de) * | 2013-09-09 | 2017-03-29 | Yale Security Inc. | Verfahren und vorrichtung zur erhöhung des digitalen eingangs- und ausgangsbereiches auf einem türbetätiger |
| CN203904725U (zh) * | 2014-06-25 | 2014-10-29 | 宁波梵科电子科技有限公司 | 一种洗衣机的开门保护电路 |
| CN204112105U (zh) * | 2014-06-30 | 2015-01-21 | 杨金睿 | 电子式洗衣机上盖安全开关 |
| US20160195409A1 (en) * | 2015-01-02 | 2016-07-07 | Xeros Limited | Monitoring system |
| CN204780313U (zh) * | 2015-06-17 | 2015-11-18 | 青岛海尔科技有限公司 | 一种用于双桶洗衣机的控制电路 |
-
2016
- 2016-07-19 DE DE102016213136.2A patent/DE102016213136A1/de not_active Withdrawn
-
2017
- 2017-07-11 CN CN201780044379.8A patent/CN109477280B/zh active Active
- 2017-07-11 EP EP17739955.7A patent/EP3488042B1/de active Active
- 2017-07-11 WO PCT/EP2017/067396 patent/WO2018015212A1/de not_active Ceased
- 2017-07-11 PL PL17739955T patent/PL3488042T3/pl unknown
Also Published As
| Publication number | Publication date |
|---|---|
| PL3488042T3 (pl) | 2021-03-08 |
| WO2018015212A1 (de) | 2018-01-25 |
| CN109477280A (zh) | 2019-03-15 |
| DE102016213136A1 (de) | 2018-02-08 |
| CN109477280B (zh) | 2021-02-02 |
| EP3488042B1 (de) | 2020-09-09 |
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