KR890001601Y1 - Protective device of unloadedheating in microwaves apparatus - Google Patents

Protective device of unloadedheating in microwaves apparatus Download PDF

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KR890001601Y1
KR890001601Y1 KR2019860005442U KR860005442U KR890001601Y1 KR 890001601 Y1 KR890001601 Y1 KR 890001601Y1 KR 2019860005442 U KR2019860005442 U KR 2019860005442U KR 860005442 U KR860005442 U KR 860005442U KR 890001601 Y1 KR890001601 Y1 KR 890001601Y1
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comparator
circuit
output
transistor
voltage
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KR2019860005442U
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KR870017601U (en
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이민기
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주식회사금성사
구자학
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/04—Heating plates with overheat protection means

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)

Abstract

내용 없음.No content.

Description

고주파 유도가열장치용 무부하가열 방지장치No-load heating prevention device for high frequency induction heating device

제1도는 본 고안 장치의 회로도.1 is a circuit diagram of the device of the present invention.

제2도는 a, b는 본 고안 장치의 작동 설명을 위한 파형도.2 is a, b is a waveform diagram for explaining the operation of the device.

제3도는 종래 무부하 가열방지 장치의 회로도.3 is a circuit diagram of a conventional no-load heating prevention device.

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

1 : 전파정류기 2 : 전류감지기1: full wave rectifier 2: current sensor

3, 4, 5 : 비교기 6 : 발진회로3, 4, 5: comparator 6: oscillation circuit

7 : 조사회로 8 : 동기회로7: irradiation circuit 8: synchronization circuit

9 : 구동회로9: drive circuit

본 고안은 고주파 유도 가열장치인 전자조리기의 그릇감지장치에 관한 것으로서, 특히 조리 사용중인 그릇을 서서히 제거하더라도 고주파 가열을 중시시키기 위한 무부하 가열방지장치에 관한 것이다.The present invention relates to a bowl detecting device for an electronic cooker, which is a high frequency induction heating device, and more particularly to a no-load heating prevention device for placing emphasis on high frequency heating even if a bowl in cooking is gradually removed.

종래 무부하 가열방지장치는 제3도에 도시된 바와같이 입력전류를 변류기 (CT)에 의하여 검출하고 전류량에 따라서 비례적으로 전압이 발생되는 전류감지기 (32)의 출력을 비교기(33)의 반전입력단자(-)에 연결시키며, 비교기(33)의 비반전 입력단자(+)에는 출력조절용 가변저항(VR)의 가동자에 연결하고, 비교기(33)의 출력은 발진회로(34)에 연결하여 동기회로(36)로서 발진출력을 구동회로(35)에 공급시키는 동작시작점을 결정하도록 하며, 구동회로(35)에 의해 전력 트랜지스터(Q1)를 제어하도록하되, 전류감지기(32) 출력을 비교기(37)의 반전 입력단자(-)에 연결시키되 저항(R5, R6)의 분배전압을 비교기(37)의 비반전입력단자(+)에 연결하여, 무부하상태(그릇이 올려지지 않은 상태)이거나 그릇을 빨리 제거하는 경우에는 전류감지기(2)의 출력은 “0”이 되므로 저항(R5, R6)에 의한 분배전압이 기준 전압보다 작게되므로 비교기(37)의 출력은 '하이'상태가 되어 트랜지스터(Q2)를 온시킨다.Conventional no-load heating prevention device detects the input current by the current transformer (CT) as shown in Figure 3 and the inverting input of the comparator 33 to the output of the current sensor 32, the voltage is generated in proportion to the amount of current Terminal (-), the non-inverting input terminal (+) of the comparator 33 is connected to the actuator of the variable resistor (VR) for output control, the output of the comparator 33 is connected to the oscillator circuit (34) An operation start point for supplying the oscillation output to the driving circuit 35 as the synchronous circuit 36 is determined, and the power transistor Q 1 is controlled by the driving circuit 35, but the output of the current sensor 32 is compared to the comparator. Connect to the inverting input terminal (-) of (37), but connect the distribution voltage of the resistors (R 5 , R 6 ) to the non-inverting input terminal (+) of the comparator 37, so that no load state (no bowl is raised). ) Or when the bowl is removed quickly, the output of the current sensor (2) becomes “0” Resistance output of the comparator 37, so the distribution voltage is less than the reference voltage by (R 5, R 6) is a "high" state turns on the transistor (Q 2).

따라서 발진장치(4)가 발진을 정지하여 출력이 없어지는 것이나 그릇을 서서히 제거하는 경우에는 저항(R5, R6)에 의한 분배전압이 기준전압보다 작게되는 시간이 길어져서 트랜지스터(Q1)의 도통주기가 걸어져서 소정전류에 도달하려고 하므로 무부하 상태로 가열이 계속된다. 따라서 무부하 가열상태가 발생되어 기기가 파손이 될뿐아니라 안정성에 문제가 있다.Therefore, when the oscillation device 4 stops oscillation and the output disappears or the vessel is gradually removed, the time for which the divided voltage by the resistors R 5 and R 6 becomes smaller than the reference voltage becomes longer and thus the transistor Q 1 . Since the conduction period of is set to reach a predetermined current, heating is continued under no load. Therefore, a no-load heating condition is generated and the device is not only damaged, but also has a problem in stability.

본 고안은 이러한 종래의 문제점을 해결하기 위하여 조리대상의 그릇 유무를 주기적으로 감지하기 위한 감지기를 설치하여 용기를 서서히 들어내도 가열을 중단시키도록하여 무부하 상태에서는 고주파 출력이 발생되지 않게 하므로서, 무부하 가열상태가 발생되지 않도록하고, 기기의 파손을 방지하고 사용시에도 안전성을 높일 수 있는 고주파 유도가열장치용 무부하 가열방지장치를 제공하는 것을 목적으로하며 이하 첨부된 도면을 참조하면서 본 고안의 구성, 작용효과를 설명하면 다음과 같다.In order to solve the conventional problems, the present invention provides a detector for periodically detecting the presence or absence of a vessel to be cooked so that the heating is stopped even when the container is slowly lifted so that no high-frequency output is generated in the no-load state. It is an object of the present invention to provide a no-load heating prevention device for high frequency induction heating apparatus which prevents a heating state from occurring, prevents damage to the device, and improves safety during use. The effect is as follows.

우선 제1도를 참조하면, 전파정류기(1), 전류감지기(2), 비교기(3, 4), 발진회로(6), 동기회로(8), 구동회로(9), 및 트랜지스터(Q1, Q2)로 구성된 고주파 유도가열장치에서, 트랜지스터(Q2)의 콜랙터와 발진회로(6) 연결점을 저항(R4)과 콘덴서 (C3)의 병렬 회로로 접지함과 동시에 비교기(5)의 비반전 입력단자(+)에 연결하되, 비교기(5)의 반전 입력단자(-)는 기준전압(V3)을 연결하고, 비교기(5)의 출력은 다이오드(D2)와 저항(R17)을 통하여 비교기(4)의 비반전 입력단자에 연결하며, 비교기 (4)의 출력을 조사회로(7)를 통하여 발진회로(6)에 연결하여된 구성으로서, 이러한 구성의 작용효과는 전류트랜스(CT)에 의해 감지된 입력전류는 전류감지기에 의해 비례적으로 직류전압으로 변화되고 사용자의 출력 조절레벨과 비교기(3)에 의해 비교되어 사용자의 출력 조절레벨보다 입력전류가 낮은 경우, 비교기(3)의 출력은 '하이'가 되고 이 전압은 저항(R13)을 거쳐 콘덴서(C3)에 충전되어 콘덴서(C3)의 충전전압은 높아지게 되며, 비교기(3) 출력이 로우인 경우 콘덴서(C3)에 충전된 전압은 저항(R4)를 통하여 서서히 감소한다. 즉, 비교기(3)의 출력상태에 따라 콘덴서(C3)의 충전전압(V1)이 결정된다.Referring first to FIG. 1, the full-wave rectifier 1, the current sensor 2, the comparators 3 and 4, the oscillation circuit 6, the synchronization circuit 8, the drive circuit 9, and the transistor Q 1. , Q 2 ) in which the connection point of the collector and oscillator circuit 6 of transistor Q 2 is grounded in parallel circuit of resistor R 4 and condenser C 3 and at the same time comparator 5 ) Is connected to the non-inverting input terminal (+), the inverting input terminal (-) of the comparator 5 is connected to the reference voltage (V 3 ), the output of the comparator (5) and the diode (D 2 ) and the resistor ( R 17 ) is connected to the non-inverting input terminal of the comparator 4, and the output of the comparator 4 is connected to the oscillation circuit 6 through the irradiation circuit 7. The input current sensed by the current transformer CT is changed into a direct current voltage proportionally by the current sensor and compared with the user's output control level by the comparator 3 to output the user's output. If the input current is lower than the section level, the output of the comparator (3) is a voltage "high" are charged in the capacitor (C 3) through a resistance (R 13) and higher is the terminal voltage of the capacitor (C 3) When the output of the comparator 3 is low, the voltage charged in the capacitor C 3 decreases gradually through the resistor R 4 . That is, the charging voltage V 1 of the capacitor C 3 is determined according to the output state of the comparator 3.

전압(V1)이 크면 제2도 가와같이 발진회로(6)에 의해 발생되는 펄스의 온듀리(duty)율이 높아지게 되어 트랜지스터(Q1)의 동작(ON)시간이 걸어진다. 따라서 작동코일(L1)에 공급되는 전류의 시간이 크게 되므로 큰 전력을 공급하게 되어 입력 전류를 증가시킨다.If the voltage V 1 is large, as shown in FIG. 2, the duty cycle of the pulse generated by the oscillation circuit 6 becomes high, and the operation time of the transistor Q 1 is extended. Therefore, the time of the current supplied to the operating coil (L 1 ) is increased, thereby supplying a large power to increase the input current.

즉, 입력전류가 사용자의 출력조절레벨보다 낮은 경우에는 기교기(3)의 출력이 '하이'가 되어 전압(V1)을 상승시켜 트랜지스터(Q1)의 온시간을 길게하여 전력공급을 증가시키고, 입력전류를 증가시켜 사용자가 조절한 전력이 되도록 한다.That is, when the input current is lower than the user's output control level, the output of the articulator 3 becomes 'high', increasing the voltage V 1 to increase the on time of the transistor Q 1 to increase the power supply. Increasing the input current to the power adjusted by the user.

그러나 무부하시 또는 비투자율이 작아 가열이 부적격한 용기를 사용하는 경우에는 전력공급이 매우 적게되어 입력전류가 거의 “0”이 되므로 비교기(4)의 출력은 '하이'가 되어 트랜지스터(Q2)를 온시켜 비교기(3)의 출력에 관계없이 전압(V1)을 “0”에 가깝게 떨어뜨린다. 즉, 발진회로의 발진을 정지시켜서 트랜지스터(Q1)를 오프시켜 가열을 중단시킨다. 그러나 용기를 서서히 제거하면 용기에 전력이 적게 공급되기 때문에 입력전류가 감소되어 비교기(3)의 출력은 '하이'가 되어 전압(V1)이 상승된다.However, if the no-load or a relative permeability smaller using the heating is inadequate vessel is very small the supply of electric power since the input current is substantially "0", the output of the comparator 4 is the 'high' transistor (Q 2) Turn on to drop the voltage (V 1 ) close to “0” regardless of the output of comparator (3). That is, the oscillation of the oscillation circuit is stopped to turn off the transistor Q 1 to stop the heating. However, if the container is slowly removed, since the container is supplied with less power, the input current is decreased, so that the output of the comparator 3 becomes 'high' and the voltage V 1 is increased.

그런데 전압(V1)이 기준전압(V3) 이상이 되면 비교기(5)의 출력이 낮아져서 비교기(4)의 출력이 하이가 되어 트랜지스터(Q2)를 온시키므로서 발진회로(6)의 작동을 중지시킨다.However, when the voltage V 1 becomes equal to or higher than the reference voltage V 3 , the output of the comparator 5 is lowered and the output of the comparator 4 becomes high to turn on the transistor Q 2 , thereby operating the oscillation circuit 6. Stops.

또한 조사회로(7)는 용기제거로인한 가열중지상태에서 용기가 다시 정상적으로 올려진 경우 가열을 위하여 주기적으로 용기의 유무를 감지한다.In addition, the irradiation circuit 7 periodically detects the presence or absence of the container for heating when the container is normally raised again in the heating stop state due to the removal of the container.

이상에서 설명된 바와같이 본 고안에 의하면, 용기를 서서히 제거시키더라도 용기제거시에는 가열을 중단시키므로서 반전기회로의 파손을 방지하고 전력트랜지스터 (Q1)를 안정영역에서 작동되도록 하여 무부하에서는 작동을 중단시키도록한 것이다.As described above, according to the present invention, even when the container is slowly removed, the heating is stopped when the container is removed to prevent breakage of the inverter circuit and to operate the power transistor Q 1 in a stable region to operate at no load. To stop it.

Claims (1)

전파정류기, 전류감지기, 비교기, 발진회로, 동기신호, 구동회로, 트랜지스터로 구성된 고주파 유도가열 장치에 있어서, 트랜지스터(Q2)의 콜렉터와 발진회로 (6) 연결점을 저항(R4)과 콘덴서(C3)의 병렬회로로 접지함과 동시에 비교기(5)의 비반전입력단자(+)에 연결하되 비교기(5)의 반전입역단자(-)는 기준전압(V3)을 연결하고, 비교기(5)의 출력은 다이오드(D2)와 저항(R17)을 통하여 비교기(4)의 비반전입력단자에 연결하며, 비교기(4)의 출력을 조사회로(7)를 통하여 발진회로(6)에 연결하여된 고주파 유도가열 장치용 무부하가열 방지장치.In the high frequency induction heating apparatus consisting of a full-wave rectifier, a current sensor, a comparator, an oscillator circuit, a synchronization signal, a driving circuit, and a transistor, the connection point of the collector of the transistor Q 2 and the oscillator circuit 6 is connected to the resistor R 4 and the capacitor ( C 3 ) is connected to the non-inverting input terminal (+) of the comparator 5 while being grounded by a parallel circuit of the comparator 5, but the inverting terminal (-) of the comparator 5 connects the reference voltage (V 3 ) and the comparator ( The output of 5) is connected to the non-inverting input terminal of the comparator 4 through the diode D 2 and the resistor R 17 , and the output of the comparator 4 is connected to the oscillation circuit 6 through the irradiation circuit 7. No load heating prevention device for high frequency induction heating device connected to
KR2019860005442U 1986-04-22 1986-04-22 Protective device of unloadedheating in microwaves apparatus KR890001601Y1 (en)

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Application Number Priority Date Filing Date Title
KR2019860005442U KR890001601Y1 (en) 1986-04-22 1986-04-22 Protective device of unloadedheating in microwaves apparatus

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Application Number Priority Date Filing Date Title
KR2019860005442U KR890001601Y1 (en) 1986-04-22 1986-04-22 Protective device of unloadedheating in microwaves apparatus

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KR870017601U KR870017601U (en) 1987-11-30
KR890001601Y1 true KR890001601Y1 (en) 1989-04-06

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KR100434660B1 (en) * 2001-09-18 2004-06-04 권용재 Apparatus for detecting cooking vessel of induction heating type cooker

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