JPS6389113U

JPS6389113U -

Info

Publication number: JPS6389113U
Application number: JP18271386U
Authority: JP
Priority date: 1986-11-26
Filing date: 1986-11-26
Publication date: 1988-06-10

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例を示すブロツク図
、第２図はその各部の波形図、第３図は水温と外
気温の関係を示す特性図、第４図は主サーミスタ
の平衡温度と補正サーミスタの検知温度の関係を
示す特性図である。１……温度検知ブリツジ回路、１ａ，１ｂ……
分圧回路、３……直流増幅部、４……三角波発振
部、５……比較部、６……スイツチング回路、７
……ヒータ装置。 Fig. 1 is a block diagram showing an embodiment of this invention, Fig. 2 is a waveform diagram of each part, Fig. 3 is a characteristic diagram showing the relationship between water temperature and outside air temperature, and Fig. 4 is a diagram showing the equilibrium temperature of the main thermistor. FIG. 7 is a characteristic diagram showing the relationship between temperatures detected by a correction thermistor. 1...Temperature detection bridge circuit, 1a, 1b...
Voltage dividing circuit, 3... DC amplifier section, 4... Triangular wave oscillation section, 5... Comparison section, 6... Switching circuit, 7
...heater device.

Claims

[Scope of Claim for Utility Model Registration] (1) A first circuit comprising a series circuit of a main thermistor that detects the temperature inside the tank and changes its resistance value, and a correction thermistor that changes its resistance value when it detects the outside temperature. a temperature detection bridge circuit consisting of a voltage dividing circuit and a second voltage dividing circuit for setting the control temperature;
and input the divided voltage of the second voltage dividing circuit to input the divided voltage of the first voltage dividing circuit to the divided voltage of the first and second voltage dividing circuit.
a DC amplification section that outputs a voltage obtained by multiplying the difference between the divided voltages of the voltage divider circuit by a predetermined coefficient; a triangular wave oscillation section that generates a triangular wave voltage; A temperature control device for a thermostatic oven, comprising a comparison section that compares a triangular wave voltage output from an oscillation section, and a switching circuit that cuts off and on energization to a heater device for heating the thermostatic oven according to the output of the comparison section. (2) The DC amplification section inputs the divided voltage of the first voltage dividing circuit to a non-inverting input terminal via a first input resistor, and inputs the divided voltage of the second voltage dividing circuit to a second voltage dividing circuit. The temperature of the constant temperature oven according to claim (1), which is an unbalanced amplifier, in which the input is input to the inverting input terminal via the input resistor of 2, and the output is fed back to the inverting input terminal via the feedback resistor. Control device.