KR100286300B1 - Door switch of refrigerator - Google Patents

Door switch of refrigerator Download PDF

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Publication number
KR100286300B1
KR100286300B1 KR1019970065570A KR19970065570A KR100286300B1 KR 100286300 B1 KR100286300 B1 KR 100286300B1 KR 1019970065570 A KR1019970065570 A KR 1019970065570A KR 19970065570 A KR19970065570 A KR 19970065570A KR 100286300 B1 KR100286300 B1 KR 100286300B1
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South Korea
Prior art keywords
fan motor
door
contact
refrigerator
door switch
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KR1019970065570A
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Korean (ko)
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KR19990047240A (en
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손승구
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구자홍
엘지전자주식회사
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00General constructional features
    • F25D23/02Doors; Covers
    • F25D23/028Details
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00Arrangement or mounting of control or safety devices
    • F25D29/005Mounting of control devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00Means for sensing or measuring; Sensors therefor
    • F25D2700/02Sensors detecting door opening

Abstract

PURPOSE: A refrigerator door switch is provided to prevent an operating defect of door switch caused due to the increase of load, while preventing defects in cooling and defrosting operation by allowing fan motor to be continuously driven even when the operating defect of door switch has occurred. CONSTITUTION: A refrigerator door switch(10) comprises a fan motor sensing unit(30) having a first contact(300) which is shorted when the refrigerating compartment door is open and a second contact(301) which is shorted when the freezer compartment door is open, wherein the first contact and the second contact are connected in parallel to the earth, and the fan motor sensing unit senses the degree of opening of the refrigerating compartment and freezer compartment doors through earth potential; and a micro computer(31) for judging the refrigerating compartment and freezer compartment doors as an open state by the earth potential output from the fan motor sensing unit, and controlling the operation of fan motor.

Description

냉장고 도어 스위치{DOOR SWITCH OF REFRIGERATOR}Refrigerator Door Switch {DOOR SWITCH OF REFRIGERATOR}

본 발명은 냉장고 도어 스위치에 관한 것으로, 특히 교류/직류 혼용이 가능한 냉장고 도어 스위치에 있어서, 직류가 입력되는 팬 모터 감지부를 역감지 회로로 구성하여 냉장고의 실 사용시 마이크로컴퓨터의 보호와 냉각 및 제상 불량 등의 기능 불량을 줄이는 냉장고 도어 스위치에 관한 것이다.The present invention relates to a refrigerator door switch, and in particular, a refrigerator door switch capable of mixing AC / DC, comprising a fan motor detecting unit having a direct current input as a reverse sensing circuit to protect, cool, and defrost the microcomputer when the refrigerator is actually used. The present invention relates to a refrigerator door switch that reduces malfunctions.

도1은 종래 도어 스위치의 구성을 보인 단면도로서, 이에 도시된 바와같이 냉장실 도어 및 냉동실 도어의 닫힘/열림상태에 따라 연동하는 버튼 L(①) 및 버튼 R(②)과, 코일스프링(③)과, 냉장실 및 냉동실 램프부의 스프링-RL(④) 및 스프링-FL(⑤)과, 공통단자부의 터미널-C(⑥)와, 팬모터부의 스프링-F(⑦)와, 팬모터 공통단자부의 터미널-C'(⑧)와, 교류/직류회로 분리용의 격벽(⑨을 구비하여 구성되어 있다.Figure 1 is a cross-sectional view showing the configuration of a conventional door switch, as shown therein the button L (①) and button R (②) and the coil spring (③) to interlock according to the closed / open state of the refrigerator compartment door and the freezer compartment door Spring-RL (④) and spring-FL (⑤) of the refrigerating and freezing chamber lamp sections, the terminal-C (⑥) of the common terminal section, the spring-F (⑦) of the fan motor section, and the terminals of the common terminal section of the fan motor. -C '(8) and the partition (9) for ac / dc circuit separation are comprised.

도2는 종래 냉장고의 구성을 보인 회로도로서, 이에 도시된 바와 같이 냉장실 도어의 열림시 단락(Short)되는 접점(100)을 통해 냉장실 램프(21)에 교류전원(AC)이 공급되고, 냉동실 도어의 열림시 단락되는 접점(101)을 통해 냉동실 램프(20)에 교류전원(AC)이 공급되며, 상기 냉장실 도어의 닫힘시 단락되는 접점(200) 및 상기 냉동실도어의 닫힘시 단락되는 접점(201)이 접지측에 직렬접속되어, 그 직렬접속의 접점(200,201)을 통해 전류가 흐를 때 냉장실 도어 및 냉동실 도어가 모두 닫힌상태로 감지하는 팬모터 감지부(24)를 구비하여 도어 스위치(10)가 구성된 것으로, 이 종래장치의 동작을 설명한다.FIG. 2 is a circuit diagram illustrating a conventional refrigerator. As shown in FIG. 2, AC power is supplied to the refrigerator compartment lamp 21 through a contact point 100 that is shorted when the refrigerator compartment door is opened. AC power is supplied to the freezer compartment lamp 20 through a contact 101 which is shorted when the door is opened, and a contact 200 which is shorted when the refrigerator door is closed and a contact point 201 which is shorted when the freezer door is closed. ) Is connected to the ground side in series, and when the current flows through the contacts 200 and 201 of the serial connection, the refrigerator motor door and the freezer door are both closed, and the fan motor detecting unit 24 detects the door switch 10. The operation of this conventional device will be described.

냉장고의 도어 즉, 냉장실도어 및 냉동실도어를 열지 않았을 경우, 도어 스위치의 버튼-L,R(①, ②)이 모두 눌려져 있는 상태로 되고, 스프링-RL(④)과 터미털-c(⑥)의 접점(100) 및 스프링-FL(⑤)과 터미날-C(⑥)의 접점(101)은 개방(OPEN)되어 있어서, 냉동실램프(20) 및 냉장실 램프(21)에 교류전원(AC)이 공급되지 않아 점등되지 않는다. 또한, 이때 팬 모터 감지부(24)의 스프링-F(⑦)와 터미널-C'(⑧)사이의 제1,제2 접점(200), (201)은 단락(Short)되어, 저항(R1, R2)의 접속점에 접지전위인 저전위가 나타나고, 이 저전위 신호를 마이크로컴퓨터(25)에서 저항(R2)을 통해 인가받아 냉장고의 도어가 모두 닫혀 있는 상태로 감지하여 팬모터 구동신호인 고전위신호를 출력하고, 이 고전위신호는 인버터(l1)를 통해 저전위로 반전되어 릴레이(RL1)를 구동시키므로 그의 접점이 온되고, 이에따라 그 릴레이(RL1)의 접점을 통해 팬모터(23)에 교류전원(AC)이 공급되어, 그 팬 모터(23)가 구동된다.When the doors of the refrigerator, i.e., the refrigerator door and the freezer door are not opened, the buttons L, R (①, ②) of the door switch are pressed, and the spring-RL (④) and the terminator-c (⑥) The contact 100 of the spring 100 and the contact 101 of the spring-FL (⑤) and the terminal-C (⑥) are open, so that the AC power source AC is supplied to the freezer chamber lamp 20 and the refrigerating chamber lamp 21. It is not supplied because it is not supplied. At this time, the first and second contacts 200 and 201 between the spring-F (⑦) and the terminal-C ′ (⑧) of the fan motor detection unit 24 are short-circuited and the resistor R1 is shorted. , The low potential, which is the ground potential, appears at the connection point of R2), and the low potential signal is applied from the microcomputer 25 through the resistor R2 to sense that the doors of the refrigerator are all closed. The high signal is outputted, and the high potential signal is inverted to a low potential through the inverter l1 to drive the relay RL1, so that its contact is turned on, and accordingly, the fan motor 23 is connected to the fan motor 23 through the contact of the relay RL1. AC power supply AC is supplied, and the fan motor 23 is driven.

한편, 냉장실 도어를 열어 버튼-L(①)이 눌려져 있지 않는 경우에는 스프링-RL(④)과 터미날-c(⑥)의 접점(100)이 단락되어 냉장실 램프(21)에 교류전원(AC)이 공급되므로 그 냉장실램프(21)가 점등 되고, 냉동실 도어를 열어 버튼-R(②)이 눌러져 있지 않은 경우에는 스프링-FL(⑤)과 터미날-c(⑥)의 접점(101)이 단락되어 냉동실 램프(20)에 교류전원(AC)이 공급되므로 그 냉동실 램프(20)가 점등된다.On the other hand, if the button-L (①) is not pressed by opening the refrigerating compartment door, the contact point 100 of the spring-RL (④) and the terminal-c (⑥) is short-circuited and the AC power source (AC) is connected to the refrigerating compartment lamp 21. Since the refrigerator compartment lamp 21 is turned on and the freezer door is opened and the button-R (②) is not pressed, the contact 101 of the spring-FL (⑤) and the terminal-c (⑥) is shorted. Since the AC power source AC is supplied to the freezer compartment lamp 20, the freezer compartment lamp 20 is turned on.

또한 상기와 같이 냉장실 도어를 열었을 경우에는 팬-모터 감지부(24)의 제1 접점(200)은 상기 버튼-L(①)에 의해 개방되고, 상기와 같이 냉동실 도어를 열었을 경우에는 팬-모터감지부(24)의 제2접점(201)은 버튼-R(②)에 의해 개방되며, 이와같은 이 제1접점(200) 및 제2접점(201)중 어느하나라도 개방되면, 접지로 흐르는 전류루프가 차단되어 저항(R1, R2)의 접속점에 전원전압(Vcc)에 따른 고전위가 나타나고, 이 고전위를 저항(R2)을 통해 마이크로 컴퓨터(25)에서 인가받아 냉장실도어 및 냉동실도어중 적어도 어느하나가 열린 것으로 감지하여 팬모터 구동정지신호인 저전위신호를 출력하며, 이 저전위신호는 인버터(l1)를 통해 고전위로 반전되어 릴레이(RL1)의 구동을 정지시키므로 그의 접점이 개방되며, 이에따라 팬모터(23)에 교류전원(AC)의 공급이 차단되어 그 팬모터(23)의 구동이 정지된다.In addition, when the refrigerating compartment door is opened as described above, the first contact point 200 of the fan-motor detection unit 24 is opened by the button-L (①), and when the freezer compartment door is opened as described above, the fan-motor The second contact 201 of the sensing unit 24 is opened by the button-R (②), and when any one of the first contact 200 and the second contact 201 is opened, it flows to the ground. The current loop is cut off, and a high potential according to the power supply voltage Vcc appears at the connection point of the resistors R1 and R2, and this high potential is applied from the microcomputer 25 through the resistor R2, and is used in the refrigerator compartment door and the freezer door. It detects that at least one is open and outputs a low potential signal that is a fan motor driving stop signal. The low potential signal is inverted to high potential through the inverter l1 to stop driving of the relay RL1, and thus its contact is opened. Accordingly, the supply of AC power to the fan motor 23 is cut off. The drive of the fan motor 23 is stopped.

상기와 같이 종래의 기술에 있어서는 냉장실 및 냉동실 도어가 모두 닫혀있는 상태일 때 스프링-F(7)과 터미널-C'(8)사이의 접점(200, 201)이 단락되어 접지측으로 전류가 흐르게 되고, 이를 마이크로컴퓨터(25)가 감지하여 팬 모터(23)를 구동하는 데, 일반적으로 냉장고는 도어가 닫혀있는 시간에 도어가 열려있는 시간보다 훨씬 길게되므로, 그 도어가 닫혀 있는 긴 시간동안 팬 모터 감지부(24)를 통해 직류(상시 혹은 대기)전류가 계속해서 인쇄회로기판의 접지측으로 흐르게되고, 이에따라 부하가 항상 걸려있어 불량이 발생하는 경우가 많고, 도어 스위치 단품 불량이 발생할 경우(팬 모터 감지부의 제1,제2 접점이 불량인 경우) 스프링-F(7)와 터미널-C'(8)가 온 되어도 접촉불량에 의한 팬 모터의 무감현상(팬 모터 감지부에서 마이크로컴퓨터로 전류가 흐르지 않는 현산)으로 팬 모터(23)가 구동하지 않아 냉각 및 제상이 제대로 되지 않는 문제점이 있었다.As described above, in the related art, when both the refrigerating compartment and the freezing compartment door are closed, the contacts 200 and 201 between the spring-F 7 and the terminal C ′ 8 are short-circuited, and current flows to the ground side. The microcomputer 25 detects this and drives the fan motor 23. In general, the refrigerator is much longer than the time when the door is opened at the time when the door is closed, so that the fan motor for the long time when the door is closed. When the direct current (normal or standby) current continues to flow to the ground side of the printed circuit board through the sensing unit 24, and the load is always applied, so that defects often occur, and door switch unit defects occur (fan motor). Defective 1st and 2nd contact part of sensing part) Fan motor's insensitivity due to poor contact even when spring-F (7) and terminal-C '(8) are turned on (current flows from fan motor sensing part to microcomputer) Not flowing Fan motor 23 is not driven due to the fact that the cooling and defrosting is not properly performed.

따라서, 본 발명은 상기와 같은 종래의 문제점을 해결하기 위하여 창안한 것으로, 직류가 입력되는 팬 모터 감지부를 역감지 회로로 구성하여, 즉, 냉장고도어가 모두 닫혀 있는 상태에서는 접지측으로 전류가 흐르지 않고, 냉장실도어 및 냉동실도어중 적어도 어느하나가 열린경우에만 접지측으로 전류가 흐르게 구성하여, 냉장고의 실 사용시 마이크로컴퓨터의 보호와 냉각 및 제상 불량 등의 기능 불량을줄이는 냉장고 도어 스위치를 제공함에 그 목적이 있다.Therefore, the present invention was devised to solve the above-mentioned conventional problems, and constitutes a reverse motor detecting fan DC input unit, that is, no current flows to the ground side when the refrigerator doors are all closed. In order to provide a refrigerator door switch that prevents microcomputer protection and malfunctions such as poor cooling and defrosting when the refrigerator is used, the current flows to the ground side only when at least one of the refrigerating chamber door and the freezing chamber door is opened. have.

도1은 종래 도어 스위치의 구성을 보인 단면도.1 is a cross-sectional view showing the configuration of a conventional door switch.

도2는 종래 냉장고의 구성을 보인 회로도.2 is a circuit diagram showing a configuration of a conventional refrigerator.

도3은 본 발명을 적용한 냉장고의 구성을 보인 회로도.Figure 3 is a circuit diagram showing the configuration of a refrigerator to which the present invention is applied.

*도면의 주요 부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings

① : 버튼-L ② : 버튼-R①: Button-L ②: Button-R

③ : 코일 스프링 ④ : 스프링-RL③: coil spring ④: spring-RL

⑤ : 스프링-FL ⑥ : 터미날-C⑤: Spring-FL ⑥: Terminal-C

⑦ : 스프링-F ⑧ : 터미날-C'⑦: Spring-F ⑧: Terminal-C '

⑨ : 격벽 10 : 도어 스위치⑨: bulkhead 10: door switch

20 : 냉동실 램프 21 : 냉장실 램프20: freezer lamp 21: refrigerator compartment lamp

22 : 전원 23 : 팬 모터22: power 23: fan motor

24,30 : 팬 모터 감지부 25,31 : 마이크로컴퓨터24,30: fan motor detector 25,31: microcomputer

100,101,200,201,300,301 : 접점 RL1: 릴레이100,101,200,201,300,301: Contact RL1: Relay

이와 같은 목적을 달성하기 위한 본 발명 냉장고 도어 스위치의 구성은, 교류/직류 혼용이 가능한 냉장고 도어 스위치에 있어서, 냉장실 도어의 열림시 단락되는 제1 접점 및 냉동실 도어의 열림시 단락되는 제2접점을 접지에 병렬 접속하여, 도어의 열림상태를 접지전위로 감지하는 팬 모터 감지부와; 상기 팬 모터 감지부에서 출력되는 접지전위를 인가받아 냉장고 도어가 열린 상태로 판별한후 팬 모터의 구동을 정지시키는 제어를 행하는 마이크로 컴퓨터를 구비함을 특징으로 한다.The refrigerator door switch of the present invention for achieving the above object is, in the refrigerator door switch capable of mixing AC / DC, the first contact short-circuit when the refrigerating compartment door is opened and the second contact short-circuit when the freezer compartment door is opened. A fan motor detecting unit connected to the ground in parallel and detecting an open state of the door at a ground potential; And a microcomputer configured to receive a ground potential output from the fan motor detector and determine that the refrigerator door is open, and to control driving of the fan motor.

이하, 본 발명에 따른 실시 예를 첨부한 도면을 참조하여 상세히 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도3은 본 발명을 적용한 냉장고의 구성을 보인 회로도로서, 이에 도시한 바와 같이 냉장실도어의 열림시 단락(Short)되는 접점(100)을 통해 냉장실램프(21)에 교류전원(AC)이 공급되고, 냉동실 도어의 열림시 단락되는 접점(101)을 통해 냉동실램프(20)에 교류전원(AC)이 공급되며, 상기 냉장실 도어의 열림시 단락되는 접점(300) 및 상기 냉동실 도어의 열림시 단락되는 접점(301)을 접지에 병렬 접속하여, 도어의 열림상태를 접지전위로 감지하는 팬모터 감지부(30)로 도어 스위치(10)를 구성한 것으로, 이 본 발명의 동작과정을 상세히 설명한다.3 is a circuit diagram showing the configuration of a refrigerator to which the present invention is applied, and as shown therein, AC power is supplied to the refrigerator compartment lamp 21 through a contact point 100 that is shorted when the refrigerator compartment door is opened. AC power is supplied to the freezer compartment lamp 20 through a contact 101 which is shorted when the freezer door is opened, and a contact 300 which is shorted when the refrigerator door is opened and a short circuit when the freezer door is opened. By connecting the contact 301 in parallel to the ground, the door switch 10 is configured as a fan motor detection unit 30 for detecting the open state of the door to the ground potential, the operation of the present invention will be described in detail.

냉장고의 도어 즉, 냉장실도어 및 냉동실도어를 열지 않았을 경우 도1의 버튼-L,R(①,②)이 모두 눌러져 있는 상태로 스프링-RL(④)과 터미털-C(⑥)의 접점(100) 및 스프링-FL(⑤)과 터미털-C(⑥)의 접점(101)이 개방되어 있어서 냉동실 램프(20) 및 냉장실 램프(21)에 교류전원(AC)이 공급되지 않아 점등 되지 않고, 또한, 이때 팬 모터 감지부(30)의 병렬 접속된 제1,제2 접점(300, 301)도 모두 개방되어, 저항(R1),(R2)의 접속점에 전원전압(Vcc)인 고전위가 나타나고, 이 고전위를 저항(R2)을 통해 마이크로컴퓨터(31)에서 입력받아 냉장고의 도어가 모두 닫힌 상태로 감지하여, 팬모터 구동신호인 고전위 신호를 출력하고, 이 고전위신호는 인버터(l1)를 통해 저전위로 반전되어 릴레이(RL1)를 구동시키므로 그의 접점이 온되고, 이에따라 릴레이(RL1)의 접점을 통해 팬모터(23)에 교류전원(AC)이 공급되어 그 팬 모터(23)가 구동된다.When the doors of the refrigerator, that is, the refrigerator door and the freezer door are not opened, the contact points of the spring-RL (④) and the terminal-C (⑥) with the buttons L, R (①, ②) shown in FIG. 100) and the contact 101 of the spring-FL (⑤) and the terminal-C (⑥) are opened so that the AC power source AC is not supplied to the freezer compartment lamp 20 and the refrigerating compartment lamp 21, and thus does not turn on. In addition, at this time, the first and second contacts 300 and 301 connected in parallel with the fan motor detection unit 30 are also opened, and the high potential that is the power supply voltage Vcc is connected to the connection points of the resistors R1 and R2. Appears, the high potential is input from the microcomputer 31 through the resistor R2, and all the doors of the refrigerator are closed, and a high potential signal, which is a fan motor driving signal, is output, and the high potential signal is an inverter. It is inverted to a low potential through l1 to drive the relay RL1, so that its contact is turned on, and accordingly, the fan motor 23 is connected to the fan motor 23 through the contact of the relay RL1. Current power (AC) is supplied that the fan motor 23 is driven.

한편, 냉장실 도어를 열었을 경우에는 버튼-L(①)이 눌러지지 않아 상기 접점(100)이 단락되고, 이에따라 교류전원(AC)이 그 접점(100)을 통해 냉장실 램프(21)에 공급되어 냉장실 램프(21)가 점등되고, 냉동실 도어를 열었을 경우는 상기 버튼-R(②)이 눌러지지 않아 상기 접점(101)이 단락되고, 이에따라 교류전원(AC)이 그 접점(101)을 통해 냉동실 램프(20)에 공급되어 그 냉동실 램프(20)가 점등된다.On the other hand, when the refrigerating compartment door is opened, the button-L (①) is not pressed and the contact point 100 is shorted, and accordingly, AC power is supplied to the refrigerating compartment lamp 21 through the contact point 100 and the refrigerating compartment is provided. When the lamp 21 is turned on and the freezer door is opened, the button-R (②) is not pressed and the contact 101 is shorted, so that the AC power source AC connects to the freezer compartment lamp through the contact 101. Supplied to 20, the freezer compartment lamp 20 is turned on.

또한, 상기와 같이 냉장실도어를 열었을 경우에는 팬모터 감지부(30)의 제1접점(300)이 단락되고, 상기와 같이 냉동실도어를 열었을 경우에는 팬모터 감지부(30)의 제2접점(301)이 단락되며, 이와같이 제1접점(300) 및 제2접점(301)중 어느하나라도 단락되면 저항(R1),(R2)의 접속점으로부터 접지로 전류가 흐르는 전류루프가 형성되어, 그 저항(R1),(R2)의 접속점에 도어의 열림감지상태를 나타내는 접지전위인 저전위가 나타나며, 이 저전위를 저항(R2)을 통해 마이크로 컴퓨터(31)에서 인가받아 냉장실 도어 및 냉동실 도어중 적어도 어느하나가 열린 것으로 판단하여 팬모터 구동정지신호인 저전위신호를 출력하며, 이 저전위 신호는 인버터(l1)을 통해 고전위로 반전되어 릴레이(RL1)의 구동을 정지시키므로 그의 접점이 개방되고, 이에따라 교류전원(AC)이 팬모터(23)에 공급되지 않아 그 팬 모터(23)의 구동이 정지된다.In addition, when the refrigerating chamber door is opened as described above, the first contact point 300 of the fan motor detection unit 30 is short-circuited, and when the freezing compartment door is opened as described above, the second contact point of the fan motor detection unit 30 ( 301 is short-circuited, and if either of the first contact point 300 and the second contact point 301 is short-circuited, a current loop is formed in which a current flows from the connection point of the resistors R1 and R2 to ground. The low potential, which is the ground potential indicating the open detection state of the door, appears at the connection point of (R1) and (R2), and the low potential is applied from the microcomputer 31 through the resistor R2 to at least one of the refrigerator compartment door and the freezer door. The low potential signal, which is a fan motor driving stop signal, is determined by determining that one is open, and the low potential signal is inverted to high potential through the inverter l1 to stop driving of the relay RL1, and thus its contact is opened. Accordingly, AC power is supplied to the fan motor 23. It does not supply the driving of the fan motor 23 is stopped.

이상에서 설명한 바와 같이 본 발명 냉장고 도어 스위치는 냉장고의 도어를 열었을때만 접지로 전류가 흐르게 하는 접지전위로 도어의 열림상태를 감지하여 마이크로컴퓨터에 공급함으로써, 마이크로컴퓨터로 흐르는 대기(상시)전류를 줄여 부하의 증가에 의한 불량을 억제하며, 또한 도어 스위치의 불량이 발생해도 팬 모터가 정지하지 않고 계속 구동함으로써, 냉각 및 제상 불량 등을 막는 효과가 있다.As described above, the refrigerator door switch of the present invention senses the open state of the door by supplying a ground potential to allow the current to flow to the ground only when the door of the refrigerator is opened, thereby reducing the standby (always) current flowing to the microcomputer. The defect caused by the increase of the load is suppressed, and the fan motor continues to operate without stopping even if a failure of the door switch occurs, thereby preventing cooling and defrosting.

Claims (1)

교류/직류 혼용이 가능한 냉장고 도어 스위치에 있어서, 냉장실 도어의 열림시 단락(Short)되는 제1접점 및 냉동실 도어의 열림시 단락되는 제2접점을 접지에 병렬 접속하여, 도어의 열림상태를 접지전위로 감지하는 팬 모터 감지부와; 상기 팬 모터 감지부에서 출력되는 접지전위를 인가받아 냉장고 도어가 열린상태로 판단한후 팬 모터의 구동을 정지시키는 제어를 행하는 마이크로 컴퓨터를 구비하여 구성된 것을 특징으로 하는 냉장고 도어 스위치.In the refrigerator door switch capable of AC / DC mixing, a first contact shorted when the refrigerating compartment door is opened and a second contact shorted when the freezer compartment door is opened are connected in parallel to the ground, and the open state of the door is grounded. Fan motor detection unit for detecting; And a microcomputer configured to control the driving of the fan motor after determining that the refrigerator door is open by receiving the ground potential output from the fan motor detection unit.
KR1019970065570A 1997-12-03 1997-12-03 Door switch of refrigerator KR100286300B1 (en)

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KR1019970065570A KR100286300B1 (en) 1997-12-03 1997-12-03 Door switch of refrigerator

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KR1019970065570A KR100286300B1 (en) 1997-12-03 1997-12-03 Door switch of refrigerator

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KR100286300B1 true KR100286300B1 (en) 2001-04-16

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