WO2012175545A1 - Printed circuit board for household appliances - Google Patents

Printed circuit board for household appliances Download PDF

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Publication number
WO2012175545A1
WO2012175545A1 PCT/EP2012/061807 EP2012061807W WO2012175545A1 WO 2012175545 A1 WO2012175545 A1 WO 2012175545A1 EP 2012061807 W EP2012061807 W EP 2012061807W WO 2012175545 A1 WO2012175545 A1 WO 2012175545A1
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WO
WIPO (PCT)
Prior art keywords
circuit board
printed circuit
triacs
package
microprocessor
Prior art date
Application number
PCT/EP2012/061807
Other languages
French (fr)
Inventor
Onder Sunetci
Gokhan Yildiz
Original Assignee
Arcelik Anonim Sirketi
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 Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Publication of WO2012175545A1 publication Critical patent/WO2012175545A1/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0007—Casings

Definitions

  • the present invention relates to a printed circuit board that is suitable for using in household appliances.
  • Triacs located in the printed circuit boards used in household appliances, for example in washing machines, are used for driving components in the household appliance, operated with electrical energy such as motor, pump, valve, fan and heater.
  • Triacs are semiconducting electronic circuit elements that can control high-value currents (such as 1 – 25 A) with low-value triggering currents (such as 3-50 mA).
  • the microprocessor located on the printed circuit board triggers the triacs through their gate electrodes by means of peripherals such as resistor, capacitor decreasing the current level in order to drive the triacs and provides the triacs to operate household appliance components whereto they are connected.
  • the microprocessor located on the printed circuit board is composed of a core wherein the software is installed, the memory unit and other electronic control units, all integrated into a plastic package. Communication between the microprocessor and other components on the printed circuit board is realized by means of the pins arranged around the microprocessor package.
  • the microprocessor communicates with other electronic components located on the printed circuit board (PCB) by means of the pins and the conductive lines.
  • the conductive lines extend between the microprocessor pins and the peripherals and the triacs, and commands of the microprocessor are transmitted to the triacs by the conductive lines and the peripherals.
  • the conductive lines between the microprocessor and the peripherals and the triacs being long causes the dimensions of the printed circuit board to increase, moreover the said conductive lines adversely affect the immunity of the printed circuit board.
  • the printed circuit board is exposed to the undesired electromagnetic wave diffusions coming from the mains whereto the household appliance is connected; moreover, the electromagnetic waves diffused by the printed circuit board to the mains adversely affect the operation of other appliances that are present in the same place as the household appliance.
  • the aim of the present invention is the realization of a printed circuit board, of which the dimensions are decreased and of which the immunity against the electromagnetic wave diffusions in its environment is increased.
  • the printed circuit board realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, suitable for using in household appliances, comprises a microprocessor wherein the programs and software are installed, triacs that drive components operated with electrical energy, such as motor, pump with appropriate current values and peripherals triggering the triacs such as resistor and capacitor, and the triacs and the peripherals are integrated into a single microprocessor package.
  • the conductive lines providing communication between the triacs and the peripherals are also integrated into the microprocessor package.
  • a significant number of the electronic components occupying space on the printed circuit board is put into a single unit together with the microprocessor.
  • a core which is the brain of the microprocessor and composed of semiconductor structures and various electronic units such as memory (RAM, ROM), current measuring, control, input-out control unit (I/O) are present in the microprocessor package, and in the embodiment of the present invention, the said units are integrated into the same package together with the triacs and the related peripherals.
  • RAM random access memory
  • ROM read-only memory
  • I/O input-out control unit
  • the triac pins connected to the output electrode of the triacs are arranged around the microprocessor package together with the other pins.
  • the triac pins are arranged at one side of the microprocessor package or at least one triac pin is integrated at each side of the package. Carrying high-value current, the triac pins are wider than the other pins around the microprocessor package.
  • the mains voltage measuring circuit and the zero-crossing detecting circuit that regulate the operation of the triacs are integrated into the microprocessor package.
  • the printed circuit board is used in household appliances such as washing machine, laundry dryer, dishwasher, cooking device and refrigerator.
  • the conductive lines between the triacs and the peripherals are shortened, thus decreasing the dimensions of the printed circuit board.
  • the shortening of the conductive lines provides the printed circuit board to be less affected by the electromagnetic waves in the environment and provides to decrease the noises of the electromagnetic waves generated by the printed circuit board to solve the EMC - electromagnetic compatibility problem and increases the immunity of the printed circuit board against the electromagnetic wave diffusions.
  • Figure 1 - is the schematic view of the printed circuit board of the present invention.
  • Figure 2 - is the schematic view of the printed circuit board in an embodiment of the present invention.
  • Figure 3 - is the schematic view of the printed circuit board in another embodiment of the present invention.
  • the printed circuit board (1) (PCB) suitable for using in household appliances comprises a microprocessor (2) regulating and controlling the programs, at least one triac (3) that drives components in the household appliance, operated with electrical energy, such as motor, pump with appropriate current values and that has input and output electrodes (A1, A2) and the gate electrode (G) and more than one peripheral (4) such as resistor and capacitor, connected to the gate electrode (G) of the triacs (3), providing the triacs (3) to be triggered with low-value electric current with the signals received from the microprocessor (2).
  • a microprocessor (2) regulating and controlling the programs
  • at least one triac (3) that drives components in the household appliance, operated with electrical energy, such as motor, pump with appropriate current values and that has input and output electrodes (A1, A2) and the gate electrode (G) and more than one peripheral (4) such as resistor and capacitor, connected to the gate electrode (G) of the triacs (3), providing the triacs (3) to be triggered with low-value electric current with the signals received from the
  • the printed circuit board (1) furthermore comprises a core (5) located in the microprocessor (2), which has integrated circuits wherein the software are installed, at least one electronic unit (U1, U2, ...) that has various functions such as memory, current measuring, input-output control, a package (6) produced from plastic, wherein the core (5) and the electronic units (U1, U2, ...) are integrated, more than one pin (7) arranged around the package (6) and that provides the communication between the microprocessor (2) and the printed circuit board (1) and more than one conductive line (8) that transmits electric current between the electronic components on the printed circuit board (1).
  • the printed circuit board (1) of the present invention comprises the triacs (3), the peripherals (4) and the conductive lines (108), which provide communication between the core (5) - the peripherals (4) - the triacs (3), are integrated into the package (6) altogether ( Figure 1). Also the other electronic units (U1, U2, ...) are located into the package (6) with the core (5), the peripherals (4), the triacs (3) and the conductive lines (108).
  • the peripherals (4) are integrated into the package (6) so as to received signal from the core (5) on the printed circuit board (1).
  • the peripherals (4) transmit the signals received from the core (5) to the gate electrodes (G) of the triacs (3) in the package (6) by means of the conductive lines (108) and trigger the triacs (3).
  • the triacs (3), the peripherals (4) and the conductive lines (108) extending therebetween are produced by being placed into a single package (6) together with the core (5) and the other electronic units (U1, U2, ).
  • the package (6) covers the triacs (3), the peripherals (4) and the conductive lines (108) between the triacs (3) and the peripherals (4) on the circuit board (1).
  • the package (6) and the pins (7) arranged around it are visible, but the triacs (3), the peripherals (4) and the conductive lines (108) extending therebetween are not.
  • the dimensions of the package (6) increase with respect to the known embodiments due to the triacs (3), the peripherals (4) and the conductive lines (8) integrated therein; however, the distance between the core (5), the peripherals (4) and the triacs (3) decreases on the entirety of the circuit board (1), and the conductive lines (108) between these components shorten.
  • the peripherals (4), the triacs (3) and the conductive lines (108) do not occupy space around the microprocessor (2) on the printed circuit board (1), thereby decreasing the dimensions of the printed circuit board (1).
  • the printed circuit board (1) furthermore comprises more than one triac pin (9) located on the microprocessor (2), connected to the output electrodes (A2) of the triacs (3), arranged around the package (6) together with the other pins (7) and of which the widths are predetermined according to the value of the electric current they carry. Carrying high-value current, the triac pins (9) are wider than the other pins (7).
  • the package (6) is rectangular and the triac pins (9) are arranged at one side of the package (6). At the other three sides of the package (6), the other pins (7) of the microprocessor (2) are arranged ( Figure 2).
  • the printed circuit board (1) is rectangular, and comprises at least one triac pin (9) located at each side of the package (6) ( Figure 3).
  • the printed circuit board (1) comprises a voltage measuring circuit (10) integrated into the package (6), that measures the mains voltage and a zero-crossing detecting circuit (11) that provides the triacs (3) to be properly driven by detecting the zero-crossings of the mains voltage.
  • the household appliance wherein the printed circuit board (1) is used is a washing machine and the triacs (3) integrated into the package (6) drive the components of the washing machine, that is the discharge pump, the drum motor, the water control valves and the door lock.
  • the household appliance wherein the printed circuit board (1) is used is a dishwasher.
  • the household appliance wherein the printed circuit board (1) is used is a laundry dryer.
  • the household appliance wherein the printed circuit board (1) is used is a cooking device.
  • the household appliance wherein the printed circuit board (1) is used is a refrigerator.
  • circuit board (1) of the present invention all of the triacs (3), the peripherals (4) that drive the triacs (3) and the conductive lines (8) that transmit signals from the core (5) to the triacs (3) are integrated into the microprocessor (2) package (6), and shorter conductive lines (8) are used with respect to the knows embodiments. Shortening of the conductive lines (8) provides the printed circuit board (1) to be less affected from the electromagnetic diffusions in the environment and provides the number of the electromagnetic waves generated by the printed circuit board (1) to decrease. The immunity of the printed circuit board (1) is improved. The dimensions of the printed circuit board (1) decrease with respect to the printed circuit boards in similar household appliances, and improvements in terms of material and printing and in terms of malfunction rates are provided.

Abstract

The present invention relates to a printed circuit board (1) suitable for using in household appliances, comprising a nnicroprocessor (2), more than one triac (3) that drives components in the household appliance, operated with electrical energy, such as motor, pump, heater with appropriate current values and that has input and output electrodes (A1, A2) and the gate electrode (G), more than one peripheral (4) such as resistor and capacitor, connected to the gate electrode (G) of the triacs (3), providing the triacs (3) to be triggered with low-value electric current with the signals received from the microprocessor (2), a core (5) located in the microprocessor (2), which has integrated circuits wherein the software is installed, a package (6) wherein the core (5) and the other electronic units (U1, U2,...) are integrated and more than one pin (7) arranged around the package (6) and that provides the communication of the microprocessor (2) with the printed circuit board (1).

Description

PRINTED CIRCUIT BOARD FOR HOUSEHOLD APPLIANCES
The present invention relates to a printed circuit board that is suitable for using in household appliances.
Triacs located in the printed circuit boards used in household appliances, for example in washing machines, are used for driving components in the household appliance, operated with electrical energy such as motor, pump, valve, fan and heater. Triacs are semiconducting electronic circuit elements that can control high-value currents (such as 1 – 25 A) with low-value triggering currents (such as 3-50 mA). The microprocessor located on the printed circuit board triggers the triacs through their gate electrodes by means of peripherals such as resistor, capacitor decreasing the current level in order to drive the triacs and provides the triacs to operate household appliance components whereto they are connected. The microprocessor located on the printed circuit board is composed of a core wherein the software is installed, the memory unit and other electronic control units, all integrated into a plastic package. Communication between the microprocessor and other components on the printed circuit board is realized by means of the pins arranged around the microprocessor package. The microprocessor communicates with other electronic components located on the printed circuit board (PCB) by means of the pins and the conductive lines. The conductive lines extend between the microprocessor pins and the peripherals and the triacs, and commands of the microprocessor are transmitted to the triacs by the conductive lines and the peripherals. The conductive lines between the microprocessor and the peripherals and the triacs being long causes the dimensions of the printed circuit board to increase, moreover the said conductive lines adversely affect the immunity of the printed circuit board. The printed circuit board is exposed to the undesired electromagnetic wave diffusions coming from the mains whereto the household appliance is connected; moreover, the electromagnetic waves diffused by the printed circuit board to the mains adversely affect the operation of other appliances that are present in the same place as the household appliance.
In the United States Patent Application No. US2010122841, a printed circuit board is described, used in an electronic household appliance, whereon the microprocessor and other electronic components are arranged.
In the United States Patent Application No. US2009165833, the program control module used in a dishwasher is described.
In the United States Patent No. US7475444, a washing machine and the control method thereof are described.
In the United States Patent No. US5735007, an automatic door opening/closing apparatus and a power supply system used in washing machines are described.
The aim of the present invention is the realization of a printed circuit board, of which the dimensions are decreased and of which the immunity against the electromagnetic wave diffusions in its environment is increased.
The printed circuit board realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, suitable for using in household appliances, comprises a microprocessor wherein the programs and software are installed, triacs that drive components operated with electrical energy, such as motor, pump with appropriate current values and peripherals triggering the triacs such as resistor and capacitor, and the triacs and the peripherals are integrated into a single microprocessor package. The conductive lines providing communication between the triacs and the peripherals are also integrated into the microprocessor package. A significant number of the electronic components occupying space on the printed circuit board is put into a single unit together with the microprocessor.
A core which is the brain of the microprocessor and composed of semiconductor structures and various electronic units such as memory (RAM, ROM), current measuring, control, input-out control unit (I/O) are present in the microprocessor package, and in the embodiment of the present invention, the said units are integrated into the same package together with the triacs and the related peripherals.
In an embodiment of the present invention, the triac pins connected to the output electrode of the triacs are arranged around the microprocessor package together with the other pins. The triac pins are arranged at one side of the microprocessor package or at least one triac pin is integrated at each side of the package. Carrying high-value current, the triac pins are wider than the other pins around the microprocessor package.
In another embodiment of the present invention, the mains voltage measuring circuit and the zero-crossing detecting circuit that regulate the operation of the triacs are integrated into the microprocessor package.
The printed circuit board is used in household appliances such as washing machine, laundry dryer, dishwasher, cooking device and refrigerator.
Since the triacs and the related peripherals are integrated into a single microprocessor package in the printed circuit board of the present invention, the conductive lines between the triacs and the peripherals are shortened, thus decreasing the dimensions of the printed circuit board. The shortening of the conductive lines provides the printed circuit board to be less affected by the electromagnetic waves in the environment and provides to decrease the noises of the electromagnetic waves generated by the printed circuit board to solve the EMC - electromagnetic compatibility problem and increases the immunity of the printed circuit board against the electromagnetic wave diffusions.
The printed circuit board realized in order to attain the aim of the present invention is illustrated in the attached claims, where:
Figure 1 - is the schematic view of the printed circuit board of the present invention.
Figure 2 - is the schematic view of the printed circuit board in an embodiment of the present invention.
Figure 3 - is the schematic view of the printed circuit board in another embodiment of the present invention.
The elements illustrated in the figures are numbered as follows:
  1. Printed circuit board
  2. Microprocessor
  3. Triac
  4. Peripheral
  5. Core
  6. Package
  7. Pin
  8. , 108. Conductive line
  9. Triac pin
  10. Voltage measuring circuit
  11. Zero-crossing detecting circuit
The printed circuit board (1) (PCB) suitable for using in household appliances comprises a microprocessor (2) regulating and controlling the programs, at least one triac (3) that drives components in the household appliance, operated with electrical energy, such as motor, pump with appropriate current values and that has input and output electrodes (A1, A2) and the gate electrode (G) and more than one peripheral (4) such as resistor and capacitor, connected to the gate electrode (G) of the triacs (3), providing the triacs (3) to be triggered with low-value electric current with the signals received from the microprocessor (2).
The printed circuit board (1) furthermore comprises a core (5) located in the microprocessor (2), which has integrated circuits wherein the software are installed, at least one electronic unit (U1, U2, ...) that has various functions such as memory, current measuring, input-output control, a package (6) produced from plastic, wherein the core (5) and the electronic units (U1, U2, ...) are integrated, more than one pin (7) arranged around the package (6) and that provides the communication between the microprocessor (2) and the printed circuit board (1) and more than one conductive line (8) that transmits electric current between the electronic components on the printed circuit board (1).
The printed circuit board (1) of the present invention comprises the triacs (3), the peripherals (4) and the conductive lines (108), which provide communication between the core (5) - the peripherals (4) - the triacs (3), are integrated into the package (6) altogether (Figure 1). Also the other electronic units (U1, U2, …) are located into the package (6) with the core (5), the peripherals (4), the triacs (3) and the conductive lines (108).
The peripherals (4) are integrated into the package (6) so as to received signal from the core (5) on the printed circuit board (1). The peripherals (4) transmit the signals received from the core (5) to the gate electrodes (G) of the triacs (3) in the package (6) by means of the conductive lines (108) and trigger the triacs (3).
The triacs (3), the peripherals (4) and the conductive lines (108) extending therebetween are produced by being placed into a single package (6) together with the core (5) and the other electronic units (U1, U2, …). The package (6) covers the triacs (3), the peripherals (4) and the conductive lines (108) between the triacs (3) and the peripherals (4) on the circuit board (1). When the circuit board (1) is viewed, the package (6) and the pins (7) arranged around it are visible, but the triacs (3), the peripherals (4) and the conductive lines (108) extending therebetween are not.
The dimensions of the package (6) increase with respect to the known embodiments due to the triacs (3), the peripherals (4) and the conductive lines (8) integrated therein; however, the distance between the core (5), the peripherals (4) and the triacs (3) decreases on the entirety of the circuit board (1), and the conductive lines (108) between these components shorten. The peripherals (4), the triacs (3) and the conductive lines (108) do not occupy space around the microprocessor (2) on the printed circuit board (1), thereby decreasing the dimensions of the printed circuit board (1).
The printed circuit board (1) furthermore comprises more than one triac pin (9) located on the microprocessor (2), connected to the output electrodes (A2) of the triacs (3), arranged around the package (6) together with the other pins (7) and of which the widths are predetermined according to the value of the electric current they carry. Carrying high-value current, the triac pins (9) are wider than the other pins (7).
In an embodiment of the present invention, the package (6) is rectangular and the triac pins (9) are arranged at one side of the package (6). At the other three sides of the package (6), the other pins (7) of the microprocessor (2) are arranged (Figure 2).
In another embodiment of the present invention, the printed circuit board (1) is rectangular, and comprises at least one triac pin (9) located at each side of the package (6) (Figure 3).
In another embodiment of the present invention, the printed circuit board (1) comprises a voltage measuring circuit (10) integrated into the package (6), that measures the mains voltage and a zero-crossing detecting circuit (11) that provides the triacs (3) to be properly driven by detecting the zero-crossings of the mains voltage.
In another embodiment of the present invention, the household appliance wherein the printed circuit board (1) is used is a washing machine and the triacs (3) integrated into the package (6) drive the components of the washing machine, that is the discharge pump, the drum motor, the water control valves and the door lock.
In another embodiment of the present invention, the household appliance wherein the printed circuit board (1) is used, is a dishwasher.
In another embodiment of the present invention, the household appliance wherein the printed circuit board (1) is used, is a laundry dryer.
In another embodiment of the present invention, the household appliance wherein the printed circuit board (1) is used is a cooking device.
In another embodiment of the present invention, the household appliance wherein the printed circuit board (1) is used, is a refrigerator.
In the circuit board (1) of the present invention, all of the triacs (3), the peripherals (4) that drive the triacs (3) and the conductive lines (8) that transmit signals from the core (5) to the triacs (3) are integrated into the microprocessor (2) package (6), and shorter conductive lines (8) are used with respect to the knows embodiments. Shortening of the conductive lines (8) provides the printed circuit board (1) to be less affected from the electromagnetic diffusions in the environment and provides the number of the electromagnetic waves generated by the printed circuit board (1) to decrease. The immunity of the printed circuit board (1) is improved. The dimensions of the printed circuit board (1) decrease with respect to the printed circuit boards in similar household appliances, and improvements in terms of material and printing and in terms of malfunction rates are provided.
It is to be understood that the present invention is not limited by the embodiments disclosed above and a person skilled in the art can easily introduce different embodiments. These should be considered within the scope of the protection disclosed by the claims of the present invention.

Claims (11)

  1. A printed circuit board (1) suitable for using in household appliances, comprising a microprocessor (2), at least one triac (3) for driving components operated with electrical energy, with appropriate current values, more than one peripheral (4) such as resistor and capacitor, connected to the gate electrode (G) of the triacs (3), providing the triacs (3) to be triggered with low-value electric current with the signals received from the microprocessor (2), a core (5) located in the microprocessor (2), which has integrated circuits wherein the software is installed, a package (6) wherein the core (5) and the electronic units (U1, U2, ...) are integrated, more than one pin (7) arranged around the package (6) and for providing the communication of the microprocessor (2) and more than one conductive line (8) for transmitting electric current between the electronic components thereon, characterized in that the triacs (3), the peripherals (4) and the conductive lines (108), which provide communication between the core (5) - the peripherals (4) - the triacs (3), are integrated into the package (6) altogether .
  2. A printed circuit board (1) as in Claim 1, characterized in that the peripherals (4) integrated into the package (6) so as to receive signal from the core (5), for transmitting the signals received from the core (5) to the gate electrodes (G) of the triacs (3) by means of the conductive lines (108), thereby providing the triacs (3) to be triggered.
  3. A printed circuit board (1) as in Claim 1 or 2, characterized in that more than one triac pin (9) connected to the output electrodes (A2) of the triacs (3) in the package (6) and arranged around the package (6) together with the other pins (7).
  4. A printed circuit board (1) as in Claim 3, characterized in that the triac pins (9) arranged at one side of the package (6).
  5. A printed circuit board (1) as in Claim 3, characterized in that at least one triac pin (9) arranged at each side of the package (6).
  6. A printed circuit board (1) as in any one of the above claims, characterized in that a voltage measuring circuit (10) integrated into the package (6), for measuring the mains voltage and a zero-crossing detecting circuit (11) for providing the triacs (3) to be properly driven by detecting the zero-crossings of the mains voltage.
  7. A washing machine comprising a printed circuit board (1) as in any one of the above claims.
  8. A laundry dryer comprising a printed circuit board (1) as in any one of the above claims.
  9. A dishwasher comprising a printed circuit board (1) as in any one of the above claims.
  10. A cooking device comprising a printed circuit board (1) as in any one of the above claims.
  11. A refrigerator comprising a printed circuit board (1) as in any one of the above claims.
PCT/EP2012/061807 2011-06-24 2012-06-20 Printed circuit board for household appliances WO2012175545A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TRA2011/06270 2011-06-24
TR201106270 2011-06-24

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WO2012175545A1 true WO2012175545A1 (en) 2012-12-27

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3441222A1 (en) * 1984-11-10 1986-05-15 Karl Winterhalter Kg, 7996 Meckenbeuren Method for controlling a commercial cleaning machine
US4982468A (en) * 1989-02-13 1991-01-08 Hitachi, Ltd. Method for operating washing machine
US5735007A (en) 1995-11-09 1998-04-07 Samsung Electronics Co., Ltd. Power supply system of a washing machine with an automatic door opening/closing apparatus
EP1435691A1 (en) * 2002-12-27 2004-07-07 STMicroelectronics S.A. Triac control circuit without galvanic isolation
US7475444B2 (en) 2004-07-20 2009-01-13 Lg Electronics Inc. Washing machine and method of controlling the same
US20090165833A1 (en) 2003-12-23 2009-07-02 Bsh Bosch Und Siemens Hausgerate Gmbh Domestic appliance with programmable control module
US20100122841A1 (en) 2008-11-14 2010-05-20 Samsung Electronics Co., Ltd. Printed circuit board assembly of electronic appliance

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3441222A1 (en) * 1984-11-10 1986-05-15 Karl Winterhalter Kg, 7996 Meckenbeuren Method for controlling a commercial cleaning machine
US4982468A (en) * 1989-02-13 1991-01-08 Hitachi, Ltd. Method for operating washing machine
US5735007A (en) 1995-11-09 1998-04-07 Samsung Electronics Co., Ltd. Power supply system of a washing machine with an automatic door opening/closing apparatus
EP1435691A1 (en) * 2002-12-27 2004-07-07 STMicroelectronics S.A. Triac control circuit without galvanic isolation
US20090165833A1 (en) 2003-12-23 2009-07-02 Bsh Bosch Und Siemens Hausgerate Gmbh Domestic appliance with programmable control module
US7475444B2 (en) 2004-07-20 2009-01-13 Lg Electronics Inc. Washing machine and method of controlling the same
US20100122841A1 (en) 2008-11-14 2010-05-20 Samsung Electronics Co., Ltd. Printed circuit board assembly of electronic appliance

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