DE1929882B2 - CIRCUIT ARRANGEMENT FOR SPARK SUPPRESSION IN PHASE GATE CONTROLS - Google Patents

Description

3 4

261 064 or French patent specification 1 483 497 a fig. 4 is a diagram of the power arrangement for radio interference suppression of thyristor switching, it is in the choke with regard to the compensation benefits known, after which a gear from the secondary winding according to the circuit according to the invention a pulse transformer and a capacitor with minimum and maximum load of the counterpart Parallel resonant circuit such a damping 5 rates, and

possesses that after the ignition of a bidirectional F i g. 5 is a graphic representation of the current-vertional thyristor diode of the load current with only one run in the λ-C element as a function of time. low rate of rise in the form of an In the circuit of FIG. 1 -are used in the locking § aperiodic vibration process. The fer-phase of the triac 1 of the capacitor 2 as well as the Konrit core of the choke has such a high intrinsic capacitor 3 of the A-C element charged. Since the replacement § attenuation that the first current minimum after the resistance for the network, consisting of condensate-conducting of the thyristor whose holding current is not sator 2, capacitor 3 and ohmic resistance 4, H falls below. As a result, no external ones are large compared to the value of the load resistance and the || Damping measures are necessary, but the resistor 4 is low, both reach Kon-1; Choke relatively expensive. Due to the reduced capacitors practically the instantaneous values of the network rate of rise of the current are also voltage. As soon as the triac 1 has become conductive due to an ignition pulse, the interference voltages in the frequency range ΜηΧττ 1 spleen, the equalization process begins, kept low, but the range of 150KHz specified in the new determination voltage and current cannot only rise when the capacitor 2 is enough. 20 Voltage (charge) decreased. The voltage changes AJgubc of the invention is to reduce radio interference from tion of the capacitor 2 by a Schvvin-Phascnanschnittsteuerungen so far that the frequency that the device to be suppressed complies with the relevant regulations, so that both the lower Fre- *] __ . .

frequencies up to 150 kHz as well as the 25 γ ^ ς upper frequencies up to 300MHz are suppressed.
The limited construction volume for the disruptive

elemcnte and its accommodation to be taken into account The network of the choke 5 (L), the condenser, after which the interference suppression circuit is to be placed in a device fin- iser 2 (C) and the ohmic resistance of the choke is supposed to allow installation in common flush-mounted boxes, 30 so designed so that the first amplitude of the current as used in apartments and households in the choke 5 or in the capacitor 2 is about as large as the suitable. In addition, one core should also be lower, such as the maximum current of the consumer6 (load). Self-damping, e.g. B. Ferrite core, application The oscillation is caused by the resistors in the can. Mains supply line, the consumer resistance, the ohm-The task v. Is based on the last seen resistance of the choke, the eddy currents in the above-mentioned arrangement for radio interference suppression by iron core of the latter and the resistor 4 solved that parallel to the capacitor Λ-C link dampens. The attenuation can be suitably switched in such a way that at the moment of switching on the combination of resistor 4 and capacitor 3 of the semiconductor switch the resonant circuit current of the exponentially decaying current through the Λ-C element 40 for all applications. The combination is superimposed, whereby the holding current of the semiconductor switching resistor 4 and capacitor 3 has, in addition to its age, even when a choke with a ferrite core is used as damping, a second self or another material with low self damping shaft that supports its effectiveness. The time con is not undercut at any time. constant for the discharge of the capacitor 3 can be The invention provides an expedient further 45 namely set so that the combination formation is that the Λ-C-member delivers through one or another residual current when the current in several Λ-C-elements is supplemented, with each additional parallel resonant circuit approaching its minimum, the Λ-C-element loaned to the capacitor of the previous one. By superimposing this current on the current in Λ-C-element, it is connected in parallel. The throttle 5 or in the thyristor (Triac 1) can be a Another useful development consists of 50 falling below the holding current during the Ausdarin that the RC- GWqA can be safely avoided by further parallel process, connected simple Λ-C elements is supplemented. In the current diagrams of FIG. 4 and 5 are the By using several Λ-C-elements, currents in the choke or capacitor 3 do not simply decay exponentially as a function of the superimposed current, represented by time. One recognizes that the RC-Ghed, but it can be formed as a sum function of several ex- 55 that is the resistor 4 and the capacitor 3, still ponentially decaying currents. A superimposed current also supplies, while the Dros through this even more favorable damping reverse current passes through its smallest values. These current ratios are achieved, with additional Λ-C members being superimposed on the choke current. If the throttle still has favorable space conditions. In the drawing, the circuit 60 according to the invention is still about 0.4 A superimposed by the capacitor 3, in three exemplary embodiments and with the risk of falling below the holding two current diagrams: current of the triac 1 (usual values 5 to 50 mA)

F i g. 1 shows a circuit arrangement with one being effectively avoided. .

Λ-C element connected in parallel to the capacitor; In Fig. 2 is a variant for switching the Ir ig. J

F i g. 2 shows this represented by one or more Λ-C-Glie- 65. The Λ-C-member, consisting of the wioer-

the added Λ-C link; stand 4 and the capacitor 2 is through one

Fig. 3 shows this by further Λ-C chain connected in parallel, consisting of the links of wraw

simple Λ-C-links supplemented Λ-C-links; stand7 and capacitor8 and resistor * unu

Capacitor 10, or additional Λ-C links arranged in the same way. This arrangement leaves a change in the current course of the current which is superimposed on the inductor current. Through this Improvements in the timing of the balancing process can still be achieved.

The same applies to the next variant in FIG. 3. Here the RCG \ ied, consisting of the resistor 4 and the capacitor 2, is supplemented by further RCGs connected in parallel, namely the resistors 11 and 13 and the capacitors 12 and 14. The individual 7? -C elements are connected in parallel to the first RC element.

It is not necessary according to either circuit 2 or circuit 3 that the individual capacitors or resistances are the same. The capacitor 2 can be more conventional than the capacitor elements Circuits are enlarged.

Because the attenuation by a suitable dimensioning for all practical applications, regardless from the choke magnet material, and a drop below the semiconductor component holding current (Thyristor or triac) by superimposing a second current component there are economic advantages in the development of radio interference suppression assemblies. Through dif By enlarging the capacitor 2, a further reduction in the interference voltage is achieved. So far could such reductions can only be achieved with chain filters. The attenuation can be achieved by the Combination of resistor 4 and capacitor 2 can be predetermined, so that the choice of magnet material for the core of the throttle is no longer decisive. So it can be used for the choke core both ferrite materials with and without an air gap be used. Ferrite mass cores can also be used for the choke.

The construction volume for the radio interference suppression components is now significantly smaller than previously known Circuits, which has a particular effect on the production costs, since high-quality magnetic materials can be dispensed with.

Above all, this circuit can be used to equip devices that are in common flush-mounted sockets like them used in apartments or households must be built in.

1 sheet of drawings

Claims (4)

1 2 a device for attenuating radio interference claims: become known in the presence of chokes with ferrite cores and when using thyristors, 1. Circuit arrangement for radio interference suppression with interference suppression due to the lack of corresponding Phase control for electrical capacitors does not occur or occurs only very slightly. A consumer, e.g. B. Incandescent lamps, fluorescent lamps, the existing Ä-C element is only used for reducing heaters, Motors and the like a semiconductor switch and a choke in series thyristors, when this is blocked from the conductive to the and pass the state in parallel to the semiconductor switch and choke. a capacitor is connected, thereby indicating that another suitable way to reduce radio interference and that, in parallel with the capacitor phase control, is connected to the sator (2) with an RC element (3, 4), in such a way that Reduction in the rate of increase in current that can be seen at the moment the semiconductor load current is switched on. These circuits share switch (1) the resonant circuit current of the expouen- is the arrangement of a resonant circuit. The triac vertically decaying current through the Ä-C element (3, 4) ig causes, when it becomes conductive, a compensation process superimposed, whereby the holding current of the semiconductor in the parallel resonant circuit (LC), the current switch (l) itself when in use a choke (5) The increase in the load current with a ferrite core or another material is no longer determined by the switch-on time of the thyristor, but rather by low self-damping at no point in time under the resonant circuit data. For one we will step. ao kungsvclle design of the parallel resonant circuit should 2. Circuit arrangement according to claim 1, that the current in the resonant circuit mesh is approximately the same size characterized in that the Ä-C element (3, 4) be like the consumer current. The smallest value of the through one or more Λ-C members (7, 8; 9, 10) the current flowing through the triac may, however, be the is complete, with each additional Λ-C-member not falling below the holding current dos Triacs, since this Otherwise the capacitor of the preceding Ä-C element 25 loses its conductivity. The attenuation of the is connected in parallel. Parallel resonant circuit is therefore usually so di- 3. Circuit arrangement according to claim 1, dimensioned that an overshoot up to values characterized in that the Ä-C element (3, 4) is avoided below the holding current of the triac, by further simple ones connected in parallel to it. The load current is the difference of the currents of Kon-Ä-C-members (11, 12; 13, 14) is added. 30 capacitor and choke. He is therefore through the Oscillating circuit data specified. This considerably reduces the rate of rise. With the Reduction of the rate of increase in current The invention relates to a circuit arrangement for the then aucl. the interference voltages, especially in the field of radio interference suppression with phase control for 35 frequency range, below 1 MHz, kept low, which electrical consumers, e.g. B. Incandescent lamps, fluorescent lamps, the occurrence of malfunctions on permissible values, Heaters, motors and the like, which is bordered. Load with a semiconductor switch and a choke in a circuit arrangement known for this purpose (SCR- Row and parallel to the semiconductor switch and manual of General Electric 4th edition 67, p. 335, Choke a capacitor is connected. 40 Fig. 16.5) shows a special Ä-C element that is used for In phase-angle control devices, the triac is connected in parallel to the capacitance, but in series elements in alternating and multi-phase circuits. In this circuit, the ohmic resistance is like this preferably thyristors or triacs application. After low resistance, that an already existing second successor The capacitor does not experience ignition of the thyristor or triac in the blocking phase of the triac the consumer current is charged with an extraordinarily large amount. As soon as the triac becomes conductive, there is The rate of increase, which caused the radio interference, but also here a compensation process. The condensation night. It lies in a broad spectrum from Ober- sator receives a certain amount for a short time waves justified, so that the general radio service, cargo; the ohmic resistance that is only during Radio and television reception is thereby effective, which has a strong impact on the equalization process, serves as an additional impairment will. The permissible radio interference voltages 50 borrowed attenuation. With the help of this circuit it is true and the interference field strength are made possible by regulations, any magnetic material for the core of the regulates. Such a regulation states that electrical chokes should be used as the attenuation by suitable devices or devices, the electromagnetic nete choice of the two capacitors and the Vibrations in the range from 150 kHz to 300 MHz. may only be put into operation 55 can be sioned. if they comply with the VDE regulations 0875 / 7.71 relating to this known circuit, however, the subsequent the limitation of radio interference is sufficient. part of the fact that an enlargement of the throttle and the It is known that interference suppression measures using a capacitor use the radio interference voltage rings of choke and capacitor elements; but since here the two capacitors are in to carry out, but if these are only connected in the high 60 series, the effective capacitance is the frequency range as effective and always leave the same lower than the smallest capacitance in the zen below 1 MHz, i.e. H. in the medium and long wave chain. To achieve a specific radio interference suppression area that lack the necessary effectiveness. They therefore have to have relatively large capacitors here and there successfully used multi-limb used for those in devices whose construction filters (German Auslegeschrift 1 258 489) are for the 65 volume is limited, the space for installation in particular Purpose too expensive. This has proven to be the case in conventional flush-type boxes, such as those used for. Am Proven to be an obstacle to an application. Apartments and households are not used. After the French patent specification 1473 038 is finally after the Austrian patent specification