EP3891892A1 - Verfahren und steuerschaltung zum ansteuern eines thyristors oder triacs - Google Patents
Verfahren und steuerschaltung zum ansteuern eines thyristors oder triacsInfo
- Publication number
- EP3891892A1 EP3891892A1 EP19805967.7A EP19805967A EP3891892A1 EP 3891892 A1 EP3891892 A1 EP 3891892A1 EP 19805967 A EP19805967 A EP 19805967A EP 3891892 A1 EP3891892 A1 EP 3891892A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- triac
- thyristor
- control circuit
- pulse
- gate
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/13—Modifications for switching at zero crossing
- H03K17/136—Modifications for switching at zero crossing in thyristor switches
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/06—Circuits specially adapted for rendering non-conductive gas discharge tubes or equivalent semiconductor devices, e.g. thyratrons, thyristors
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current
-
- 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
- H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC
- H02M5/04—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters
- H02M5/22—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/25—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M5/257—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M5/2573—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with control circuit
- H02M5/2576—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with control circuit with digital control
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/28—Modifications for introducing a time delay before switching
- H03K17/292—Modifications for introducing a time delay before switching in thyristor, unijunction transistor or programmable unijunction transistor switches
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0009—AC switches, i.e. delivering AC power to a load
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0027—Measuring means of, e.g. currents through or voltages across the switch
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0036—Means reducing energy consumption
Definitions
- the present invention relates to a method for driving a thyristor or tri acs, the thyristor or triac being ignited by a control circuit after a voltage zero crossing of an AC voltage source by means of a gate current pulse, and a corresponding control circuit.
- Thyristors and triacs are ignited by a current at the gate electrode, i.e. switched to conductive and remain conductive after switching on even without gate current until the current flow through the thyristor or triac falls below a so-called holding current. While thyristors can only switch in one direction and thus act like a diode when switched on, triacs functionally represent an anti-parallel circuit of two thyristors and can thus switch alternating current. In principle, it is possible to keep the thyristor or triac permanently switched on by a continuous gate current. On the other hand, the thyristor or triac can also be ignited by gate current pulses after a voltage zero crossing of the AC voltage source, as a result of which the energy consumption of the control can be reduced.
- the method for driving a thyristor or triac wherein the thyristor or triac after a voltage zero crossing gang of an AC voltage source by means of a gate current pulse is ignited by a control circuit having an adjustment phase in which the control circuit determines an ignition pulse duration of the gate current pulse for igniting the thyristor or triac, since with the current through the thyristor or triac after the end of the gate current pulse at least one Einraststromwert reached, and an operating phase in which the control circuit controls the thyristor or triac after a voltage zero crossing of the AC voltage source with a gate current pulse with the determined ignition pulse duration and then monitors a current flow through the thyristor or triac.
- the most optimal firing pulse duration can be set with which reliable and energy-saving control for firing the thyristor or triac can be achieved.
- a correct and energy-saving control for firing the thyristor or triac can be achieved.
- the monitoring also enables adaptive adaptation of the control of the thyristor or triac in order to achieve a reliable and energy-saving mode of operation.
- the energy saving effect is particularly evident with thyristors and triacs, which require high gate currents to ignite.
- the reduced energy consumption can also reduce the heat generation of the thyristor or triac.
- the control circuit preferably adjusts the set ignition pulse duration if the monitoring shows that there is no current flow through the thyristor or triac after the end of the gate current pulse.
- the current flow through the thyristor or triac is preferably monitored using a gate voltage between the gate connection and the cathode connection of the thyristor or triac. If the gate voltage exceeds a predetermined limit value, there is a current flow through the thyristor or triac.
- the control circuit controls the thyristor or triac with a further gate current pulse with a hold pulse duration in the operating phase before the AC voltage source crosses zero.
- the control circuit preferably also determines in the setting phase a hold pulse duration for the further gate current pulse before a voltage zero crossing of the AC voltage source, so that the current through the thyristor or triac does not fall below a hold current value before the start of the further gate current pulse.
- the control circuit preferably adjusts the set holding pulse duration if the monitoring shows that there is no current flow through the thyristor or triac before the start of the further gate current pulse.
- the thyristor or triac is ignited only after a certain phase angle after a voltage zero crossing of the AC voltage source by means of a gate current pulse.
- the control circuit determines the ignition pulse duration in the setting phase as a function of the predetermined phase angle and controls the thyristor or triac in the operating phase only after the predetermined phase angle after a zero voltage crossing of the AC voltage source with a gate current pulse with the determined ignition pulse duration .
- control circuit preferably determines several different ignition pulse durations for different phase angles in the setting phase.
- control circuit repeats the adjustment phase regularly.
- the setting of the firing pulse duration and / or the holding pulse duration can be adapted to possibly changing operating conditions or functional properties of the thyristor or triac.
- the control circuit for driving a thyristor or triac includes a pulse generator for generating a gate current pulse to a gate terminal of the thyristor or triac, a current flow monitoring device for monitoring a current flow through the thyristor or triac, and a controller which is connected to the Pulse generator and the Stromflußüberwachungsein direction is connected, wherein the controller for performing the above-described method for driving a thyristor or triac is designed according to the invention.
- the current flow monitoring device has a voltage detection device for detecting a gate voltage between the gate connection and the cathode connection of the thyristor or triac.
- the control circuit preferably also has a memory connected to the controller for storing the determined ignition pulse duration, the adapted ignition pulse duration, the determined hold pulse duration and the adapted hold pulse duration.
- Figure 1 is a circuit diagram of a triac circuit with a control circuit according to the vorlie invention.
- Fig. 2 is a current-time diagram for explaining the principle of operation of a control circuit according to the present invention
- FIG. 3 shows a flowchart of a method for driving a triac according to an exemplary embodiment of the present invention
- FIG. 4 shows a flow chart of an adjustment phase for adjusting the ignition pulse duration for the method of FIG. 3; and FIG. 5 shows a flowchart of an adjustment phase for adjusting the hold pulse duration for the method from FIG. 3.
- FIGS. 1 and 2 With reference to FIGS. 1 and 2, the structure and mode of operation of a triac circuit with a control circuit according to the invention are first explained by way of example.
- the triac circuit contains a series connection of a triac 1 and a load 2, which is connected to an AC voltage source 3.
- the triac 1 is controlled by a control circuit 4.
- the control circuit 4 has a pulse generator 6 for generating gate current pulses IP1, IP2 with a gate current value IG which are applied to the gate electrode of the triac 1.
- the pulse generator 6 is operated by a controller 5.
- a phase synchronization 7 with the AC voltage source 3 is provided.
- the controller 5 is also connected to a memory 8 for storing various parameter values, a timer 9 and a current flow monitoring device for monitoring a current flow through the triac 1.
- the current flow monitoring device has a voltage detection device 10 for detecting a gate voltage UG between the gate electrode and the cathode of the triac 1.
- the ignition pulse duration TL of the gate current pulse IP1 is selected such that the current IR through the triac after the end of the gate current pulse IP1 exceeds a latching current value IL, so that the triac 1 remains switched on even without a gate current IG. Should be prevented that the triac 1 turns off when the current IR through the triac 1 falls below a holding current value IH, then before the next voltage zero crossing tNO a further gate current pulse IP2 is applied to the gate electrode of the triac 1 by the Keep triac 1 on.
- the holding pulse duration TH of the further gate current mimpulses IP2 is chosen so that the current IR through the triac at the beginning of the further gate current pulse IP2 is still above the holding current value IH. If the phase duration of a voltage half-wave is designated TP, the further gate current pulse IP2 is started at a time tnO + TP-TH.
- the method according to the invention for actuating the triac 1 contains an adjustment phase P10 and an operating phase P20, the operating phase comprising an ignition phase P22, a monitoring phase P24 and a holding phase P26 can be broken down.
- the control circuit 4 determines an ignition pulse duration TL for the gate current pulse IP1 after a voltage zero crossing tNO and a Haltim pulse duration TH for the further gate current pulse IP2 before a voltage zero crossing tNO, as illustrated in FIGS. 4 and 5.
- the setting phase P10 can also be referred to as the learning phase, since the pulse durations TL, TH are not set by a user, but are determined automatically by the control circuit 4.
- the setting of the ignition pulse duration TL in the setting phase P10 by the control circuit 4 comprises the steps S120 to S126.
- the controller 5 uses the voltage detection device 10 to check whether the gate voltage UG has reached a predetermined limit value UGM in order to conclude from this that there is or does not exist a current flow through the triac 1. If after the end of the gate current pulse IP1 there is a current flow through the triac 1 (“J” in S124), the ignition pulse duration TL is long enough for the current IR through the triac to exceed the latching current value IL and for the triac 1 to be switched on even without a gate current IG remains. In this case, the current value of the ignition pulse duration TL is stored in the memory 8 of the control circuit 4 (step S125) in order to be used for the gate current pulse IP1 in the ignition phase P22 of the operating phase P20.
- the ignition pulse duration TL is too short, so that current IR through the triac does not reach the latching current value IL and the triac 1 is without gate current IG turns off.
- the current value of the ignition pulse duration TL is increased by a pulse duration difference dt in step S126 and the process from step S122 (or alternatively from step S121) is repeated until the increased ignition pulse duration TL is sufficient (“J” in S124).
- the setting of the holding pulse duration TH in the setting phase P10 by the control circuit 4 comprises the steps S140 to S144.
- the holding pulse duration TH is first set to an initial value TH0.
- the initial value can be the determined ignition pulse duration TL, for example. It is then checked in step S141 whether at the beginning of the further gate current pulse IP2, i.e. at the time tNO + TP - TH current IR still flows through the triac 1. If this is not the case (“N” in S141), the holding pulse duration TH must be increased in step S142, so that the further gate current pulse IP2 begins earlier. The increased hold pulse duration TH is then stored in the memory 8 (step S143) in order to be used for the further gate current pulse IP2 in the hold phase P26 of the operating phase P20.
- step S141 If, on the other hand, there is still a current flow IR through the triac 1 (“J” in S141) at the beginning of the further gate current pulse IP2, the holding pulse duration TH is shortened by dT in step S144 and the method goes back to step S141.
- the setting of the holding pulse duration TH by the control circuit 4 can also be dispensed with.
- the holding pulse duration TH is set, for example, to the value of the determined ignition pulse duration TL, so that the further gate current pulse IP2 is certainly long enough for the triac to remain switched on before the next voltage zero crossing tNO.
- control circuit 4 After completion of the described setting phase P10, the control circuit 4 goes into the operating phase P20, in which the triac 1 is controlled according to the settings and the proper and energy-saving functioning of the triac 1 is monitored.
- the ignition phase P22 of the operating phase P20 begins at a voltage zero crossing tNO (step S220).
- the gate current pulse IP1 is started (step S222) and maintained for the determined ignition pulse duration TL (step S224).
- step S224 the gate current IG is switched off (step S240) and the monitoring phase P24 begins.
- step S241 the voltage detection device 10 of the control circuit 4 detects the gate voltage UG.
- step S242 the detected gate voltage UG is compared with a predetermined limit value UGM. If the gate voltage UG reaches the limit value UGM (“J” in S242), the controller 5 detects a current flow IR through the triac 1. This means that the ignition pulse duration TL is sufficient to ignite the triac 1.
- step S243 the gate current pulse IP1 is therefore immediately activated again in order to switch on the triac 1.
- step S240 the ignition pulse duration TL can also be adjusted. This adjustment takes place, for example, analogously to the adjustment phase according to FIG. 4.
- the gate voltage UG is detected by the voltage detection device 10 of the control circuit 4 (step S246).
- the detected gate voltage UG is compared with a predetermined limit value UGM. If the gate voltage UG reaches the limit value UGM (“J” in S247), the controller 5 detects a current flow IR through the triac 1. This means that the triac 1 is still switched on and the further gate current pulse IP2 has not yet started correctly had to become. Monitoring of the current flow then continues.
- step S247 the controller 5 knows that the current flow IR through the triac 1 no longer exists. This means that the holding pulse duration TH is too short and the triac 1 has already switched off before the start of the further gate current pulse IP2.
- a gate current IG is therefore immediately applied to the triac 1 in order to switch the triac 1 on again.
- the holding pulse duration TH can also be adapted. This adjustment takes place, for example, analogously to the setting phase according to FIG. 5.
- step S260 the further gate current pulse IP2 is then started in order to maintain the current flow IR through the triac 1, even if the current IR falls below the holding current value ICH.
- the further gate current pulse IP2 is then retained until the next voltage zero crossing tNO + TP (step S261).
- the operating phase P20 is then continued for the next voltage half-wave with the same steps S220 to S261.
- the present invention can also be implemented in connection with a so-called leading edge control.
- the gate current pulse IP1 is only started after a certain phase angle W after the voltage zero crossing tNO, as shown in FIG. 2 indicated.
- the further gate current pulse IP2 can already be ended a certain phase angle before the voltage zero crossing tNO.
- the control circuit 4 determines different ignition pulse durations TL and, if appropriate, also different holding pulse durations TH for different phase angles W.
- the controller 5 selects the determined pulse durations TL, TH for the respectively desired phase angle W in order to carry out the operating phase P20 with these pulse durations TL, TH.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Power Conversion In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018009494.5A DE102018009494B4 (de) | 2018-12-04 | 2018-12-04 | Verfahren und Steuerschaltung zum Ansteuern elnes Thyristors oder Triacs |
| PCT/EP2019/081865 WO2020114767A1 (de) | 2018-12-04 | 2019-11-20 | Verfahren und steuerschaltung zum ansteuern eines thyristors oder triacs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3891892A1 true EP3891892A1 (de) | 2021-10-13 |
Family
ID=68618163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19805967.7A Withdrawn EP3891892A1 (de) | 2018-12-04 | 2019-11-20 | Verfahren und steuerschaltung zum ansteuern eines thyristors oder triacs |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3891892A1 (de) |
| DE (1) | DE102018009494B4 (de) |
| WO (1) | WO2020114767A1 (de) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2325881A1 (de) * | 1973-05-22 | 1974-11-28 | Schwenk Kg Theben Werk | Verfahren und schaltungsanordnung zum ein- und ausschalten eines halbleiterschalters im nulldurchgang der betriebswechselspannung |
| DE2922219C3 (de) * | 1979-05-31 | 1982-03-11 | Siemens AG, 1000 Berlin und 8000 München | Elektronischer Sensor-Ein/Aus-Schalter |
| DE3037794C2 (de) * | 1980-10-07 | 1982-11-25 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Nullspannungsschalter |
| DE3402793C1 (de) * | 1984-01-27 | 1985-07-11 | Telefunken electronic GmbH, 7100 Heilbronn | Phasenanschnittsteuerung |
| US4959558A (en) * | 1988-03-31 | 1990-09-25 | U.S. Philips Corporation | Circuit arrangement for detecting cross-over by an alternating voltage of a fixed reference voltage level |
| AUPN208295A0 (en) * | 1995-03-31 | 1995-04-27 | Philips Electronics Australia Limited | Circuit arrangement for controlling a triac |
| DE19850905B4 (de) * | 1998-11-05 | 2007-10-18 | Gerhard Kurz | Vorrichtung zur Leistungssteuerung |
| US8816752B2 (en) * | 2012-03-23 | 2014-08-26 | Silicon Laboratories Inc. | Adaptive triac controller |
-
2018
- 2018-12-04 DE DE102018009494.5A patent/DE102018009494B4/de active Active
-
2019
- 2019-11-20 WO PCT/EP2019/081865 patent/WO2020114767A1/de not_active Ceased
- 2019-11-20 EP EP19805967.7A patent/EP3891892A1/de not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE102018009494B4 (de) | 2025-09-04 |
| DE102018009494A1 (de) | 2020-06-04 |
| WO2020114767A1 (de) | 2020-06-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE3779790T2 (de) | Regelschaltungsanordnung fuer das lichtbogenschweissen von komponenten. | |
| EP1854997B1 (de) | Zündeinrichtung für eine Brennkraftmaschine | |
| EP1328370A2 (de) | Verfahren zum steuern und/oder regeln eines schweissprozesses | |
| EP2547897B1 (de) | Zündverfahren und zündanlage dafür | |
| EP2163139A1 (de) | Schaltungsanordnung und verfahren zum betreiben mindestens einer led und mindestens einer leuchtstofflampe | |
| EP1854998B1 (de) | Zündeinrichtung für eine Brennkraftmaschine | |
| DE10311540A1 (de) | Kraftstoffeinspritzungs-Timer und Stromregler | |
| EP3891892A1 (de) | Verfahren und steuerschaltung zum ansteuern eines thyristors oder triacs | |
| DE1928198B2 (de) | Kurzschluß-Lichtbogenschweißvorrichtung | |
| EP1207340A2 (de) | Verfahren zur Regelung eines Gasbrenners | |
| DE4003623A1 (de) | Verfahren zur steuerung einer anlage zur plasmabehandlung von werkstuecken | |
| EP2564500B1 (de) | Schalterfreie diac-ersatzschaltung | |
| DE2713045C3 (de) | Schweißstromquelle | |
| WO2016020087A1 (de) | Zündsystem und verfahren zum steuern eines zündsystems für eine fremdgezündete brennkraftmaschine | |
| EP2807363B1 (de) | Verfahren und ansteuereinrichtung zum aufladen oder entladen eines piezoelektrischen aktors | |
| AT502422A1 (de) | Verfahren zum betreiben eines wasserdampfplasmabrenners und wasserdampf-schneidgerät | |
| EP1708344B1 (de) | Schaltungsanordnung und Verfahren zum Regeln einer getakteten Stromversorgung | |
| EP1875590B1 (de) | Phasenanschnittsteuerung | |
| EP0116874B1 (de) | Verfahren und Schaltungsanordnung zum Zünden von Gaslasern und Gaslaserverstärkern | |
| DE4125742C2 (de) | Funkenerosionsimpulsgenerator und Verfahren zum Funkenerodieren von Werkstücken | |
| DE3490272C2 (de) | ||
| DE10057224C2 (de) | Verfahren zur automatischen Funktionsüberprüfung bei einer Gas/Luft-Verbundregelung | |
| DE2034688C3 (de) | Schaltungsanordnung zur Stromversorgung von Signallampen für Blinklichtanlagen | |
| DE967297C (de) | Schaltanordnung zum Steuern des Stromverlaufes waehrend der Einschaltdauer des Schweissstromes bei Widerstandsschweissmaschinen mit zuendstiftgesteuerten Entladungsgefaessen, die ueber gittergesteuerte Gluehkathodenroehren gezuendet werden | |
| DE3402793C1 (de) | Phasenanschnittsteuerung |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
| 17P | Request for examination filed |
Effective date: 20210525 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
| INTG | Intention to grant announced |
Effective date: 20231103 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 20240305 |