JPS62199818U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of the main parts of the power control device based on this invention, mainly including the input circuit, and Figure 2 is a diagram of the main parts of the power control device based on this invention.
Figure 3 is a diagram showing the voltage characteristics with respect to the control current at points A and B in the figure, and Figure 3 is a diagram showing the relationship between the control current at each setting rate and the output energization rate in the gradient setter of the power control device according to this invention. , Fig. 4 is a circuit diagram showing an example of a conventional power control device, Fig. 5 is a block diagram showing an example of the structure of a non-contact circuit and a power control circuit for an electric furnace, and Fig. 6 is a circuit diagram showing an example of the structure of a power control circuit for an electric furnace. A diagram showing voltage characteristics with respect to the control current at points A and B, FIG. 7 is a diagram to explain the operation of the triangular wave generation circuit, and FIG. 8 is a diagram showing the control of each setting rate in the slope setting device of FIG. 4. FIG. 3 is a diagram showing the relationship between current and output energization rate. In the figure, 1 is a control signal, 5 is a gradient setter,
13 is a heater, 14 is a power supply, 21 is an operation amplifier, and 22 is a constant voltage. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Amendment November 21, 1981 The name of the invention is amended as follows. Title of the invention: Power control device The scope of the claims for utility model registration and the brief description of the drawings are amended as follows.

[Claims for Utility Model Registration] Input means for voltage converting a control signal corresponding to a temperature to be controlled and outputting a control voltage corresponding to the control signal, triangular wave generating means for outputting a triangular wave voltage, and said control comprising a cycle control means for comparing a voltage with the triangular wave voltage and a thyristor, and when the cycle control means detects that the triangular wave voltage is smaller than the control voltage,
In a power control device, the power control device has a switch means for energizing and heating a temperature-controlled object, and cycles-controls the temperature-controlled object by opening and closing the switch means, wherein the control voltage is set to a voltage corresponding to the minimum value of the control signal. A power control device characterized by comprising voltage output means for applying voltage.

[Brief Description of the Drawings] Fig. 1 is a circuit diagram of the main parts of the power control device according to the present invention, and Fig. 2 shows the relationship between the control current of the power control device shown in Fig. 1 and the voltage corresponding to the control current. 3 is a diagram showing the relationship between the control current of the power control device shown in FIG. 1 and the energization rate of the thyristor, FIG. 4 is a circuit diagram of the conventional power control device, and FIG. 5 is the circuit diagram of the non-contact switch circuit shown in Fig. 4,
Fig. 6 is a diagram showing the relationship between the control current of the power control device shown in Fig. 4 and the voltage corresponding to the control current, and Fig. 7 is a diagram showing the relationship between the control current of the power control device shown in Fig. 4 and the thyristor energization. It is a figure showing the relationship with rate.
FIG. 8 is a current conduction rate characteristic diagram. In each figure, 1 is a control signal, 2 is a diode, 4 is an impedance converter, 21 is an operational amplifier, 22
are input terminals, R1, R2, and R3 are resistors, VR is a variable resistor, A is an output circuit, B is a triangular wave generation circuit, C is a cycle control circuit, and D is a non-contact switch circuit. Note that in each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] The temperature inside the electric furnace is detected, and the main circuit current flowing to the heating heater provided in the electric furnace is cycle-controlled by a control signal based on the deviation between the detected temperature and the set temperature of the temperature controller. In the power control device, the output end of an operation amplifier that inputs a constant voltage equal to the minimum input voltage of the control signal is connected to the lower limit side of the gradient setter that divides the control signal, and the voltage on the lower limit side is A power control device that always maintains a constant value.