JPH03192409A - Non-linear variable temperature compensating circuit - Google Patents

Abstract

PURPOSE:To easily obtain the optimum temperature compensating voltage of a circuit equipped with a non-linear temperature characteristic by providing a thermistor connected to the anode of a diode and a variable resistor. CONSTITUTION:A diode 2 and a thermistor 5 are connected from a positive power source +V through a resistor 1 and the diode 2 and the thermistor 5 are connected to a variable resistor 3. The sliding terminal of the variable resistor 3 is connected to a negative power source -V. In such a case, for the control voltage, namely, the temperature compensating voltage Vo of a circuit 4 equipped with the non-linear temperature characteristic, a current I to flow to the diode 2 is changed by changing a current I to flow to the thermistor 5 according to the temperature, and therefore, by controlling a current in the non-linear part of a V-I characteristic for the diode 2, inclination can be obtained to each temperature. Then, the inclination of the non-linear characteristic can be controlled as a whole by controlling the sliding terminal of the variable resistor 3. Thus, the optimum temperature compensating voltage can be easily obtained for the circuit equipped with the non-linear temperature characteristic.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a temperature compensation circuit, and more particularly to a circuit whose temperature characteristics are nonlinear, and particularly to a circuit whose nonlinearity is not constant.

[Conventional technology]

Conventionally, this type of temperature compensation circuit is connected to the anode of a diode 2 through a resistor 1 connected to a positive power source V, as shown in FIG. It was configured to be connected to the power supply -■. Furthermore, the optimum temperature compensation voltage (2) at the point where the resistor 1 and the anode of the diode 2 are connected. was connected to a circuit 4 having non-linear temperature characteristics.

[Problem to be solved by the invention]

The conventional temperature compensation circuit described above has a diode 2 in FIG.
The voltage obtained from the temperature characteristics of ■. However, as shown in FIG. 3, it becomes a straight line as shown by dotted line 1. However, the optimum temperature compensation voltage vs. temperature for circuit 4, which has a non-linear temperature characteristic.

Since the characteristics are as shown in line 2, the optimum temperature compensation voltage v0 cannot be obtained, and the characteristics of the circuit 4, which has non-linear temperature characteristics, deteriorate significantly depending on the temperature.

[Means to solve the problem]

The non-linear variable temperature compensation circuit of the present invention is connected from a positive power source to the anode of a diode through a resistor, and one cathode is connected to a variable resistor.

Furthermore, a thermistor is connected to both ends of the anode of the diode and one variable resistor, and the sliding terminal of the variable resistor is connected to a negative power source. In other words, the resistance value of the thermistor connected in parallel with the diode changes with temperature, thereby changing the forward current flowing through the diode, that is, the current in the non-linear part of the diode's V-workability, and adjusting the slope depending on the temperature. Moreover, the non-linear slope can also be adjusted using a variable resistor.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

In Figure 1, in this embodiment, the resistor 1 is connected to the positive power supply terminal ■.
The diode 2 and thermistor 5 are connected through the diode 2 and thermistor 5, and each diode 2 and thermistor 5 are connected to the variable resistor 3, while the sliding terminal of the variable resistor is connected to the negative power supply -2.

In the non-linear variable temperature compensation circuit having the above configuration, the control voltage of the circuit 4 having non-linear temperature characteristics, that is, the optimum temperature compensation voltage (2) for each temperature.

The characteristic is non-linear as shown by line 2 in FIG.

In order to compensate for this line 2 in Figure 3, the current flowing through the diode 2 is adjusted by the variable resistor 3 so that the current becomes the non-linear portion of the forward current of the diode's V-I characteristic. . Also, the resistance value of the thermistor 5 connected to the anode of the diode 2 and the variable resistor 3 changes depending on a certain temperature, so that a current flows through the thermistor 5 (1).
also changes. From this, when the temperature becomes low, the resistance value of the thermistor 5 increases, the current I flowing through the thermistor 5 decreases, and the current I flowing through the diode 2 decreases.
becomes larger, and the temperature characteristic slope of the ■-■ characteristic of the diode 2 becomes larger, and the slope becomes larger at lower temperatures as shown in FIG. Conversely, when the temperature is high, the resistance value of the thermistor 5 decreases, the current ■1 flowing through the thermistor 5 increases, and the current ■ flowing through the diode 2 decreases, resulting in the temperature of the forward current of the V-I characteristic of the diode 2. The slope of the characteristic becomes smaller as the temperature increases, as shown by line 3 in FIG.

Furthermore, the circuit 4 having non-linearity does not always have constant characteristics as shown by the line 2 in FIG. Therefore, the control voltage of the circuit 4 which has non-linear temperature characteristics, that is, the optimum temperature compensation voltage ■. By changing the current flowing through the thermistor 5 depending on the temperature, and by changing the current flowing through the diode 2, the slope for each temperature can be obtained by controlling the current in the non-linear part of the V-I characteristic of the diode 2. The slope of the entire nonlinear characteristic can also be controlled by adjusting the sliding terminal of the variable resistor 3 which is connected to the negative power source -1.

〔Effect of the invention〕

As explained above, in the present invention, the resistance value of the thermistor connected in parallel between the anode of the diode and the variable resistor connected to one cathode changes depending on the temperature, so that the current flowing through the diode changes. V of
- The slope is changed by controlling the current in the non-linear part of the I characteristic, and the slope of the entire non-linear characteristic is also adjusted by adjusting the sliding terminal of the variable resistor connected to the negative power supply. This has the effect of easily obtaining the optimum temperature compensation voltage for a circuit with linear temperature characteristics.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram showing a conventional example, and FIG. 3 is a diagram showing the relationship between temperature and control voltage. l...Resistor, 2...Diode, 3
...Variable resistor, 4...Circuit with non-linear temperature characteristics, 5...Thermistor, fV...
...Positive power supply, -■ Negative power supply, v. ...Control voltage, I, 1.・・・・・・Current.

Claims (1)

[Claims] A first power source is connected to one terminal of the diode through a resistor, the other terminal of the diode is connected to a variable resistor, and a thermistor is further connected in parallel to the series circuit of the diode and the variable resistor. and a sliding terminal of the variable resistor is connected to a second power source.