JPS62293962A - Power controller - Google Patents

Abstract

PURPOSE:To enable a non-contact switch circuit to be correctly connected to a cycle control circuit according to the sort of the non-contact switch circuit, by arranging a second terminal for generating the output of signal for turning a thyristor ON, and a third terminal for earthing a first and a second switch circuits. CONSTITUTION:A first terminal 25 for connecting a control power source 11 to a non-contact switch circuit D1 for requiring an external power source for turning a thyristor ON/OFF, a second terminal 24 for connecting the collector of a transistor 10 to the non-contact switch circuit D1 or a non-contact switch circuit D2 for requiring no external power source for turning the thyristor ON/OFF, and a third terminal 25 for earthing the non-contact switch circuits D1, D2 arc arranged. When a cycle control circuit C is connected to the circuit D1, then the terminals 23 and 24 are used, and when the cycle control circuit C is connected to the circuit D2, then the terminals 24 and 25 are used.

Description

Detailed Description of the Invention 6. Detailed Description of the Invention [Industrial Application Field] This invention turns a thyristor switch on and off in response to a control signal V, and uses the ratio of on and off times to control electric furnaces, etc. [Prior art] Figure 2 is a circuit diagram showing an example of a power control device using a normal cycle control method, and (1) A control signal (Rt) from a temperature controller (not shown) that detects the temperature of an electric furnace, etc. and outputs it according to the deviation between the detected temperature and the set temperature, is a control signal (Rt) that converts this control signal (1) into a pressure Resistance to be converted into value, (R2
) fl terminal (3) is a human resistance, (4) is an impedance converter, (2) is an input signal (1) whose positive and negative connections are reversely connected.
(5) is a gradient setter and a resistor (R3
) and form a voltage divider circuit 'km of the output voltage to the impedance converter (4).

Operation amplifier (5L (6) and variable resistance (power, resistance (R4), (R5),
The part consisting of (R6), (R7), and contact (C) is a triangular wave generation circuit, and the voltage of the triangular wave 1-voltage periodic electric appliance (terminal rVi) is adjusted by setting the 6-variable resistor (7). The triangular wave voltage is determined by

(8) is a comparator, which compares the original voltage input manually from the gradient setter (5) with the triangular wave voltage, and determines the period during which the triangular wave voltage is higher than the input voltage from the gradient setter (5). ) is set to the output voltage tl-L level. (9) is a light emitting diode and a resistor (R,)
The on/off output status ak of the comparator (8) is indicated by the current flowing through the resistor (as).
The control signal is inputted to the transistor αq via i, and the entire control signal is transmitted to the non-contact switch 4.

(11) is a non-contact switch circuit consisting of a power supply, a2 input terminal (to), α4t, zero cross trigger circuit, thyristor switch, etc. for the control signal output by transistor αq, and (to) is an electric furnace, etc. The heater α4 is the power supply for this heater.

FIG. 3 is a block diagram showing the configuration of the above-mentioned non-contact switch circuit, and also showing an example of the overall configuration of a conventional power control circuit for an electric furnace. In the figure, the fc part surrounded by the chain stitch is a non-contact switch circuit, (to) is a zero cross trigger circuit, αQ is an AND circuit, α71 is a thyristor switch, αF! J is a pulse transformer that combines the AND circuit and the operation line of the thyristor switch α power, capacitor 4 and resistor wire are the thyristor switch αη
The surge absorbing element, port J, and α4 are the heater and power source of the electric furnace shown in FIG. 2, respectively.

Figure 4 shows that the output of the comparator (8) in Figure 2 above is connected to the non-contact switch circuit (6) via the transistor αO.
This is a circuit diagram showing all the main parts that are input to the thyristor switch αη, where υ is a drive circuit for the thyristor switch αη, which consists of a coupling circuit such as a pulse transformer and a zero cross trigger circuit, and the transistor α
When the emitter-collector of 1 is on, the current from the power supply (11) drives the drive circuit q1 through the terminal C1+Czk □ Figure 5 is different from the drive circuit +2υ shown in Figure 4 above, and the drive circuit in the figure is different from the drive circuit +2υ shown in Figure 4 above. The on/off input between the emitter and collector of the transistor signal input through the terminals C2*C3 drives the drive circuit without requiring the external power supply aη as described above.

In the electric power meter configured as described above, the temperature of the electric furnace is detected by the temperature controller, and based on the detected temperature, a control signal (11k, for example 4 It outputs in the DC current range of ~20mA, converts the entire current into voltage, and inputs it to the terminal (3).This input signal is divided into voltages by the impedance converter (41k, gradient setting! (5)), and the comparator (
8).

On the other hand, in the triangular wave generation circuit, as shown in Fig. 3(a), triangular a is output as the center value of the constant voltage manual value (Vl)', and this 3A wave output and the above gradient setting 5 (5) are output.
When the partial pressure output of Transistor a0 is driven by one pulse from C and C, and AND circuit OQ pulse transformer α11? The thyristor switch α″/) is turned on and off through the thyristor switch α″/). In this case, the average output force (P) of the heater (to) is calculated from the energization state shown in Fig. 3(d) as follows: P=on time/f time between on times Then, the main circuit's power t is supplied to the heater υ. The output terminal of the comparator (8) output via the transistor αO and the non-contact switch circuit (
Since the connection with 2) differs depending on the coupling circuit 2υ,
If the connection circuit 3υ or δ is not properly connected due to a misunderstanding by an operator, the specified control operation may not be obtained, and depending on the conditions, there is a risk of an overheating accident in the electric furnace. Gatsu fc.

This invention was made to solve this problem, and the output of the comparator (8) and the non-contact switch circuit (
6) The overall purpose is to obtain a power charge system that can be connected correctly depending on the type of fully coupled circuit.

[Means to solve problems]

Electricity charge according to this invention 014IjAt! t, a cycle 1fill (
Divided into an iliO unit and a non-contact switching unit consisting of a zero cross trigger circuit, thyristor switch, etc.
The output end of the cycle control unit is provided with three terminals, the first terminal of which is connected to the control power supply, the second terminal connected to the emitter of the control output transistor, and the third terminal connected to the collector. 0 [Operation] In this invention, if the power supply of the pulse current flowing to the output transistor is not supplied to the input side of the a1 non-contact switching unit, the first. The second terminal is fully used, and the pulse current is applied to the input terminal. #2 if you have all. The cycle control unit and the non-contact switching unit are connected by using all the third terminals.

[Embodiments of the invention]

FIG. 1 shows the required fB of a power 1IlII# device according to an embodiment of the present invention! It is an S diagram, (a), (9L
(10, (R4).

(R9) is the same part as the same reference numeral in FIGS. 4 and 5 showing the conventional column, and the circuit constituted by these, the input circuit, and the triangular wave generation circuit are used as a cycle control unit, and the zero cross trigger circuit, thyristor switch, etc. The non-contact switching unit is divided into two parts, and the control power supply Qυ is connected to the output end.
of the first terminal connected to.

The second terminal connected to the emitter of transistor QO! 2
41, three terminals are provided, consisting of a third terminal C and a terminal C which are also connected to the collector.

In the power control device configured as described above, the non-contact switching unit connected to the cycle control unit does not have a power source on the input side that generates pulsed current waves according to the opening and closing of the emitter and collector of the transistor αO. In case of A, terminal C! 4 and terminal 1241, and in the case of B which has the above power supply on the input side, terminal 4 and terminal (
Since the connection is made by (c), the type of non-contact switching unit connected to the cycle control unit can be used regardless of the presence or absence of a power supply for control.〇 [Effects of the Invention] This invention As explained above, three terminals are provided in the cycle control circuit which is an output 4t unit of the control signal connected to the non-contact switching circuit, and two of these terminals are made to correspond to the type of the non-contact switching circuit and are selected. Since it is configured to connect, it is possible to obtain a power control device that is free from the possibility of miswiring or accidents caused by the miswiring.

[Brief explanation of the drawing]

Fig. 1 shows the main parts of a power control device according to an embodiment of the present invention, Fig. 2 is a circuit diagram showing an example of the configuration of a conventional power control device, and Fig. 3 shows a conventional power control system. An overall configuration diagram showing an example, Figures 4 and 5 are circuit diagrams showing the main parts of the connection between the cycle control output section and the non-contact switching circuit in a conventional power control device, and Figure 3 is a triangular wave generation circuit. It is a line diagram showing the operation of. In the figure, (1) Ta control signal, αQ is a transistor, α2) is a power supply, (To) is a heater, 01 is a power supply, Ta is a first terminal, (24) Iri is a second terminal, Q51 is a third terminal. terminal. In addition, are the same symbols in the figures the same or equivalent parts? Showing O Agent Patent Attorney Tadashi Sato Year 3 Figure 14: Yukigen Procedural Corrector (Voluntary) September 29, 1985

Claims (1)

[Claims] Electric power that detects the temperature inside the electric furnace and controls the cycle of the main circuit current flowing to the heater installed in the electric furnace using a control signal based on the deviation between the detected temperature and the set temperature of the temperature controller. In the control device, a circuit consisting of an input circuit to which the control signal is input and a cycle control circuit to output a pulse wave according to this input value is divided into units, and a first circuit is connected to the output end of this unitized circuit. A power control device having three terminals each having a terminal connected to a power source for control, a second terminal connected to an emitter of a control output transistor, and a third terminal connected to a collector of the control output transistor. .