DE1118346B - Protection device for electrical valves - Google Patents
Protection device for electrical valvesInfo
- Publication number
- DE1118346B DE1118346B DEA34633A DEA0034633A DE1118346B DE 1118346 B DE1118346 B DE 1118346B DE A34633 A DEA34633 A DE A34633A DE A0034633 A DEA0034633 A DE A0034633A DE 1118346 B DE1118346 B DE 1118346B
- Authority
- DE
- Germany
- Prior art keywords
- protection device
- charges
- valves
- inductance
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/062—Avoiding or suppressing excessive transient voltages or currents
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Description
Schutzeinrichtung für elektrische Ventile Die Erfindung betrifft eine Schutzeinrichtung für elektrische Ventile, insbesondere Halbleiterventile, gegen die Wirkung unerwünschter Ladungen während der Sperrzeit.Protection device for electrical valves The invention relates to a Protection device for electrical valves, in particular semiconductor valves, against the effect of unwanted charges during the blocking period.
Bei Gleichrichtern, insbesondere Halbleitergleichrichtern, entstehen während der Durchlaßrichtung beim Stromdurchgang Ladungen, welche während der Sperrzeit noch vorhanden sind und dann einen unerwünschten Strom in Sperrichtung erzeugen. Dieser tritt wohl nur kurzzeitig auf, kann aber in Verbindung mit einer immer vorhandenen Induktivität des Kreises hohe Spannungen erzeugen, gegen die die Gleichrichter in Sperrichtung besonders empfindlich sind.In rectifiers, in particular semiconductor rectifiers, arise during the forward direction during the passage of current charges, which during the blocking time are still present and then generate an undesirable reverse current. This occurs only briefly, but can be combined with an ever present Inductance of the circuit generate high voltages against which the rectifier in Blocking direction are particularly sensitive.
Um diese Erscheinung unwirksam zu machen, hat man vorgeschlagen, Kondensatoren mit Widerständen oder nichtlineare Widerstände den Gleichrichterelementen parallel zu schalten. Diese leiten die entstandenen Ladungen während der Sperrzeit ab. Alle diese Maßnahmen leiten die entstehenden Überspannungen erst während der Sperrphase der Ventile ab. Sie sind aber nicht in der Lage, die durch die Ladung entstehenden Ströme bereits im Augenblick des Entstehens unwirksam zu machen.In order to make this phenomenon ineffective, it has been proposed to use capacitors with resistors or non-linear resistors the rectifier elements in parallel to switch. These divert the charges generated during the blocking period. All these measures only conduct the resulting overvoltages during the blocking phase the valves. But they are not able to deal with the charges caused by the charge To make currents ineffective as soon as they arise.
Erfindungsgemäß wird nun vorgeschlagen, den Ventilen Induktivitäten vorzuschalten, deren Flußänderung die Ladungen in parallelen Kreisen abbaut.According to the invention it is now proposed to add inductances to the valves upstream, the change in flux reduces the charges in parallel circles.
Die Figur zeigt ein Ausführungsbeispiel der Erfhidung. Dem Gleichrichterelement 1 ist eine Induktivität in Form eines über die Zuleitung geschobenen Eisenringes 2 vorgeschaltet. Der ganzen Anordnung liegt ein Kondensator 3 parallel. Die Wirkungsweise ist hierbei folgende: In der Durchlaßphase entstehen im Gleichrichterelement Ladungen, welche- bis zur Sperrphase erhalten bleiben, wenn sie nicht abgeleitet werden. Gleichzeitig baut sich in der Induktivität 2 ein Fluß auf, welcher eine Spannung erzeugt, die sich in der parallel geschalteten Kapazität auszugleichen versucht. Der Abbau dieses Flusses liefert eine Elektrizitätsmenge, welche etwa gleich der im Ventil erzeugten Ladung ist. Hierdurch gleichen sich die durch die Ladung und durch den Fluß entstehenden Ströme aus. Der durch den Flußabbau nach Beendigung der Durchlaßphase bedingte Strom ist etwa gleich dem durch die Ladungen entstehenden Strom, wirkt aber entgegengesetzt, so daß in Wirklichkeit kein Strom fließen kann. Dadurch wird erreicht, daß der Gleichrichter in der ganzen Sperrphase richtig sperrt.The figure shows an embodiment of the invention. The rectifier element 1 is preceded by an inductance in the form of an iron ring 2 pushed over the supply line. A capacitor 3 is parallel to the entire arrangement. The mode of operation here is as follows: In the conducting phase, charges arise in the rectifier element, which are retained until the blocking phase if they are not diverted. At the same time, a flux builds up in the inductance 2, which generates a voltage which tries to equalize itself in the capacitance connected in parallel. The breakdown of this flow provides an amount of electricity that is roughly equal to the charge generated in the valve. As a result, the currents created by the charge and by the river balance each other out. The current caused by the reduction in flux after the end of the conducting phase is roughly equal to the current generated by the charges, but has an opposite effect, so that in reality no current can flow. This ensures that the rectifier blocks correctly throughout the blocking phase.
Es ist bei dieser Anordnung gleichgültig, ob die Induktivität vor oder hinter dem Gleichrichter liegt. Der Kapazität kann noch ein Widerstand vorgeschaltet sein, um die Entladungszeit zu beeinflussen.It is immaterial in this arrangement whether the inductance is in front or behind the rectifier. A resistor can be connected upstream of the capacitance to influence the discharge time.
Der Vorteil dieser Anordnung ist, daß die durch solche Ladungen entstehenden Ströme schon beim Entstehen kompensiert und daher die Sperrphase voll wirksam sein kann.The advantage of this arrangement is that the charges generated by such charges Currents are compensated when they arise and the blocking phase can therefore be fully effective can.
Claims (5)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1118346X | 1960-04-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1118346B true DE1118346B (en) | 1961-11-30 |
Family
ID=4558499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEA34633A Pending DE1118346B (en) | 1960-04-02 | 1960-05-12 | Protection device for electrical valves |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1118346B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4566059A (en) * | 1983-07-21 | 1986-01-21 | Venus Scientific Inc. | Converter with lossless snubbing components |
-
1960
- 1960-05-12 DE DEA34633A patent/DE1118346B/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4566059A (en) * | 1983-07-21 | 1986-01-21 | Venus Scientific Inc. | Converter with lossless snubbing components |
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