KR930005139Y1 - Temperature control circuit of electric furnace - Google Patents
Temperature control circuit of electric furnace Download PDFInfo
- Publication number
- KR930005139Y1 KR930005139Y1 KR2019890002911U KR890002911U KR930005139Y1 KR 930005139 Y1 KR930005139 Y1 KR 930005139Y1 KR 2019890002911 U KR2019890002911 U KR 2019890002911U KR 890002911 U KR890002911 U KR 890002911U KR 930005139 Y1 KR930005139 Y1 KR 930005139Y1
- Authority
- KR
- South Korea
- Prior art keywords
- voltage
- electric furnace
- temperature control
- control circuit
- converted
- Prior art date
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
Abstract
내용 없음.No content.
Description
첨부한 도면은 본 고안의 온도제어회로도.The accompanying drawings are a temperature control circuit diagram of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 제1전압레귤레이터 2 : 제2전압레귤레이터1: 1st voltage regulator 2: 2nd voltage regulator
3 : 임피던스부 BD1 : 브리지다이오드3: impedance section BD1: bridge diode
OP1 : 연산증폭기 VR1, VR2 : 가변저항OP1: Operational Amplifier VR1, VR2: Variable Resistor
TH1 : 더미스터TH1: Dummyster
본 고안은 전기로에 관한 것으로, 특히 전기로내의 온도를 오차가 거의 없이 일정한 상태로 유지시키는 전기로의 온도제어회로에 관한 것이다.The present invention relates to an electric furnace, and more particularly, to a temperature control circuit of an electric furnace for maintaining the temperature in the electric furnace in a constant state with little error.
종래의 전기로에 있어서는 전기로내의 온도를 제어함에 있어 정확도가 ±0.1% 정도여서 전기로를 사용하는 제품의 불량요인이 될 수 있었다.In a conventional electric furnace, the accuracy of controlling the temperature in the electric furnace is about 0.1%, which may be a bad factor of a product using the electric furnace.
따라서 본 고안은 상기의 결점을 감안해 온도제어의 정확도를 높임으로써 제품의 품질이 향상되도록 안출한 것으로서, 이를 첨부한 도면에 의하여 상세히 설명하면 다음과 같다.Therefore, the present invention is designed to improve the quality of the product by increasing the accuracy of the temperature control in view of the above drawbacks, described in detail by the accompanying drawings as follows.
본 고안은 온도제어회로는 첨부한 도면에 도시한 바와 같이 교류전원(AC)의 트랜스포머(T1)로 유도되어 브리지다이오드(BD1)에 의해 전파정류되고, 제1전압레귤레이터(1)를 통해 정전압으로 출력된 후 캐패시터(C1, C2)에 의해 평활되어 제2전압레귤레이터(2)에서 소정전압으로 변화되며, 이와 같이 변환된 전압은 가변저항(VR1, VR2) 및 저항(R1)(R2)으로 분압되어 기준전압(Vref)으로 비교기용 연산증폭기 (OP1)에 인가됨에 따라 그의 출력신호에 의해 상기 제2전압레귤레이터(2)가 제어됨과 아울러, 캐패시터(C4,C5)에 의해 평활되고, 더미스터(TH1) 및 임피던스부(3)에 분압되어 출력전압(V0)이 전기로(도면에 미표시)에 인가되게 구성한 것으로, 이의 작용 및 효과를 살펴보면 아래와 같다.According to the present invention, the temperature control circuit is guided to the transformer T1 of the AC power source AC as shown in the accompanying drawings, and is full-wave rectified by the bridge diode BD1, and the constant voltage is passed through the first voltage regulator 1. After being output, the capacitors are smoothed by the capacitors C1 and C2 to change to a predetermined voltage in the second voltage regulator 2, and the converted voltage is divided into the variable resistors VR1 and VR2 and the resistors R1 and R2. The second voltage regulator 2 is controlled by the output signal thereof and smoothed by the capacitors C4 and C5 as it is applied to the operational amplifier OP1 for the comparator at the reference voltage Vref. TH1) and the impedance unit 3 are divided so that the output voltage (V 0 ) is configured to be applied to an electric furnace (not shown). The operation and effects thereof will be described below.
교류전원(AC)이 트랜스포머(T1)로 유도되어 브리지다이오드(BD1)에서 전파정류되고, 제1전압레귤레이터(1)를 통해 정전압으로 출력되어서는 캐패시터(C1,C2)에 의해 그 출력전압에 포함된 리플성분이 제거되며, 제2전압레귤레이터(2)에서 소정전압으로 변환되어 출력된다.The AC power source AC is induced to the transformer T1, full-wave rectified by the bridge diode BD1, and is output as a constant voltage through the first voltage regulator 1 to be included in the output voltage by the capacitors C1 and C2. The ripple component is removed, and is converted to a predetermined voltage by the second voltage regulator 2 and output.
이때 제2전압레귤레이터(2)로부터 출력되는 전압은 궤환되어서는 가변저항 (VR1,VR2), 저항(R2) 및 (R3)에 의해 분압되어 기준전압(Vref)으로 비교기용 연산증폭기(OP1)의 비반전 입력단자에 인가되고, 이에 따라 그 연산증폭기(OP1)의 출력신호에 의해 상기 제2전압레귤레이터(2)가 제어됨과 아울러, 캐패시터(C4,C5)에 의해 평활되어서는 더미스터(TH1) 및 임피던스부(3)로 분압되어 그 더미스터(TH1)에 인가되는 출력전압(V0)이 전기로에 인가된다.At this time, the voltage output from the second voltage regulator 2 is fed back and divided by the variable resistors VR1 and VR2, the resistors R2 and R3 to the reference voltage Vref of the operational amplifier OP1 for the comparator. When applied to the non-inverting input terminal, the second voltage regulator 2 is controlled by the output signal of the operational amplifier OP1 and smoothed by the capacitors C4 and C5. And an output voltage V 0 divided by the impedance unit 3 and applied to the dummyster TH1 is applied to the electric furnace.
따라서 전기로내의 온도가 높아지면 더미스터(TH1)의 저항값이 작아져 출력전압(V0)이 낮아지고, 반대로 온도가 높아지면 더미스터(TH1)의 저항값이 커져 출력전압(VO)이 높아진다.Therefore, when the temperature in the electric furnace increases, the resistance value of the dummyster TH1 decreases and the output voltage V 0 decreases. On the contrary, when the temperature increases, the resistance value of the dummyster TH1 increases and the output voltage VO increases. .
이와 같이 교류전원(AC)이 제1,2전압레귤레이터(1),(2)에 의해 소정값의 정전압으로 변환되고, 더미스터(TH1)로 출럭전압(V0)을 조정하여 전기로내의 온도를 ±0.01%의 정확도로 제어할 수 있다.As described above, the AC power source AC is converted into a constant voltage having a predetermined value by the first and second voltage regulators 1 and 2, and the rung voltage V 0 is adjusted by the dummyster TH1 to adjust the temperature in the electric furnace. It can be controlled with an accuracy of ± 0.01%.
그러므로 본 고안은 불량요인을 줄임으로써 제품원가를 절감하고, 제품의 품질향상을 기할 수 있는 효과가 있다.Therefore, the present invention has the effect of reducing the product cost and reducing the quality of the product by reducing defective factors.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019890002911U KR930005139Y1 (en) | 1989-03-15 | 1989-03-15 | Temperature control circuit of electric furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019890002911U KR930005139Y1 (en) | 1989-03-15 | 1989-03-15 | Temperature control circuit of electric furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR900017576U KR900017576U (en) | 1990-10-05 |
| KR930005139Y1 true KR930005139Y1 (en) | 1993-08-09 |
Family
ID=19284396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019890002911U KR930005139Y1 (en) | 1989-03-15 | 1989-03-15 | Temperature control circuit of electric furnace |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR930005139Y1 (en) |
-
1989
- 1989-03-15 KR KR2019890002911U patent/KR930005139Y1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR900017576U (en) | 1990-10-05 |
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