DE2157230C - Electronic switch - Google Patents

Description

In energy electronics, it is common to charge for protection.

fuses must be provided for semiconductor components. 45 To solve this problem, according to the specification Under particularly unfavorable operating conditions it is proposed that to charge the Loschkonden- or when commissioning power converter systems, the secondary winding of a transformer sators Faults can occur that lead to the fuse breaking in series with a diode parallel to the extinguishing thyristor cases lead. is placed, with the diode and the Löschthynstor

So far, attempts have been made to unite anti-parallel with quick switches 50 with respect to their forward direction the semiconductor components are adequately protected.

elements and their fuses. For the mastery of large currents, in

For the development of the invention, however, the triggering data of these switches have a main theme for each branch Use cases too high to protect a safe ristor with series reactors angeord protection to guarantee. 55 net, each of which has its own quenching capacitor.

There is already an electronic switch arranged between the main thyristors and beat, which has a quenching device connected to the choke coils. For such the counter voltages in the circuit of the switchgear, it is advantageous to the currents in the branches element coupled. to monitor in order to provide a

The main idea behind this proposal is to cause the thyristors to be extinguished. One of them in that an extinguishing device with at least like monitoring can according to the invention the two quenching circuits are provided, each of which detect voltage on the quenching capacitors and ^ from a coil at which an opposing voltage arises. Enable reclosing when the condensate ' and which is in series with the main thyristor and sator voltage is sufficient. a capacitor in series with a 65 The advantages of the electronic switch according to the Quenching thyristor with anti-parallel diode of the coil invention can be seen in the fact that an additional connected in parallel and via a resistor from protective resistance in the extinguishing circuit as well as a Unterdem Supply network is rechargeable. With this preliminary break the voltage source can be dispensed with

secure extinction by the extinguishing thyristor as well as a The switch is guaranteed to be ready to be switched on again.

In the drawing, exemplary embodiments according to the invention are shown.

Fig. 1 shows a main thyristor with delete and Umladek-cis and

F i g. 2 shows a circuit arrangement for use with large currents.

According to Fig. 1, in a DC circuit 1> o the main thyristor 2, which in normal operation a continuous ignition signal from an electronics unit (not shown) receives. A * lying parallel to it Quenching thyristor3 is blocked In series with the Quenching thyristor 3, a quenching capacitor 4 is arranged. Before deletion, this has the polarity shown in column I. In parallel with the thyristor is the secondary winding 5 a, transformer 6 and in series with it a diode 7 gel * parallel to The main thyristor 2 is also a protective resistor 8 ″ arranged. An alternating current source is connected to the transformer 6 connected.

In the case of an overcurrent in a DC circuit, an ignition signal is virtually instantaneously applied to the Loschthyristor3 and locked at the Zund- a ₅ signal for the main thyristor. 2 The quenching capacitor 4 takes over the main current for a period of time which is in the μs range, whereby the current flow in the main thyristor 2 is interrupted. This period of time is greater than the release time of the thyristor 2, so that this, de-energized and without an ignition »er ^y al. nichi re-ignites. In order to keep an impermissibly high positive voltage away from the thyristors 2 and 3, the bypass path with the low-ohmic ^{circuit is not connected to a g ^ lvan ^ c e} V ^ _{16n disturbance} , so the electric circuit is caused _{by the}

the EMC to ^zei ™ ^ ^m ° _au f _protection cons-commutating ** j ^ 2 _nschaltung of Hauptthy ^{stana B Disl}

^nst ° ^T \ pntladune of the quenching capacitor4. After. ™ _{bene Po} uaaung i _arit ät. for

sits oies he tejg ^ a ₁₁ J _n J it is necessary to set the fast ^^^ Zglgemescme polarity of the capacitor 4 to dieentgege g

according to column Ul urnz ^ AC network

This transshipment ertmgi a ^ _? ^ _djc

about the Tran ^ ™ ^ator _u ° _re i " _{heild great>} what by

Monitoring of this bp ³ ^ _{1 For this} is the Schahei: «every ems» ^ ^

^ _the thyristors give. u y

™ hi

eu. ^^

input signal

In Appendix

Fig. «F /.
MOundU each
resist

the ^ »»
is, edem y
sator 13:14 and [
ladekre.sm itJ
winding 2 of the

Main thyristors,

l lying protective ^ _{the Vortdk} .

_{χ auszunut} ZCN.

Extinguishing condensers g _Um

\ _{qt the} secondary f _{and the} diode S.

re to J f
arranges, with the
between the ^{Η &} Ρί ^
ten made, «nL Da
the AnsiAhitettdteaund
play an essential role

_{Erasing sc} selspuzwischen hkondensatoren _Dros

This switching device is therefore if it is sufficiently sma.

1 sheet of drawings

Claims (3)

blow should have the following disadvantages well-known direct current semi-conductor producer. be seitiet. For example, through the parallel Allocation of the quenching capacitor to the Haq «tnyn- I. Electronic switch with an extinguishing disturbance when switching off ^ P ^ ung on the consumer direction, which is connected in parallel to one or more only to double the value before se to N main thyristors and an extinguishing sank. It was also has not mogk.den ^ stand thyristor and a quenching capacitor to be permanently switched as ™™ * £ * £ _ characterized in that the lost capacity to up. ^F ^ "" ^r ™ ^c ^ Sf den ld d Löhkdt (4) di Skdä at least in a number of known f ^ al ^ n, den characterized in that the ability to g ^ charge of the quenching capacitor (4) the secondary minimum io known in a number f ^ winding (5) of a transformer (6) in series controller for a certain time ^ei ^ ^ eeschaltet to sen CaMn with a diode (7) parallel to the Löschthyri- IÄchkondenKtor his Loah ^^ t neither disturbance (3) is placed, whereby the diode (7) and the obtained. Thus the performance capability of such quenching thyristors (3) was limited with regard to their forward directional circuits. With the ■ »projection they are viewed antiparallel. 15 could use the * i »™haben & ^ P ™ ^h ™ * f £ 2J _n " ^ £ 2 Electronic switch according to claim 1, the circuit reduced and ² J ¹ S ^ J « ⁿ » 'characterized in that when using rapid switch-off after switching on emc It several parallel main thyristors (9, 10, 11) are. . , choke coils (16, 17, 18) in series with them and that each branch has its own Löschkon- * o for reloading the Loschkonc., sators η Losch capacitor (13, 14, 15) is arranged, which are suitable between two-.hen circles. So are IJrnschwingkrus «. ι .. the main thyristors (9,10,! I) and the choke application, which consists of an inductance and cmc coils (16, 17, 18) is connected. Diode are made in parallel. / at Loschihyr.stor at 3. Electronic teasers according to claim 1, are ordered, wherein (He Diode e-ne _{gegeng.setzu characterized by monitoring the a 5} forward direction putweis This measure is n.-voltage of the Löschkoi.densator, (3,! 3, 14, 15) Particularly suitable for switches that periodically see 1.- and its release for reclosing the capacitor takes too long. 30 Finally, it is known about the quenching capacitor a rectifier and a resistor pat all! to arrange. The rectifier is via an via carrier to an alternating current ™.:? connected. Around to avoid that the quenching thyristor is constantly current- 35 is flowed through, a switch is to be provided that briefly switches on the voltage source. But also this circuit is unsuitable as it takes too long to charge the capacitor. The invention relates to an electronic switch. The invention is therefore based on the object with a quenching device, parallel to a 40 to create a switching device with which it is possible or several main thyristors is connected and is, with little technical effort, one a quenching thyristor and a quenching capacitor to achieve rapid turn-off and turn-on, d. n. the having. Quenching capacitor quickly after the discharge