CA1166309A - Thyristor valve for a high voltage convertor - Google Patents
Thyristor valve for a high voltage convertorInfo
- Publication number
- CA1166309A CA1166309A CA000364348A CA364348A CA1166309A CA 1166309 A CA1166309 A CA 1166309A CA 000364348 A CA000364348 A CA 000364348A CA 364348 A CA364348 A CA 364348A CA 1166309 A CA1166309 A CA 1166309A
- Authority
- CA
- Canada
- Prior art keywords
- thyristor
- control device
- voltage
- capacitor
- resistor
- 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.)
- Expired
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
- 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
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Power Conversion In General (AREA)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
- Thyristor Switches And Gates (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE:
In a high voltage thyristor valve, a voltage divider is connected in parallel with each thyristor. A
capacitor for supplying the control device of the thyristor is connected to a tap on the voltage divider and arranged to be charged from the voltage divider. A resistor is con-nected in series with the capacitor, this resistor ins-tantaneously providing a supply voltage to the control device of the thyristor when an overvoltage appears across the thyristor.
In a high voltage thyristor valve, a voltage divider is connected in parallel with each thyristor. A
capacitor for supplying the control device of the thyristor is connected to a tap on the voltage divider and arranged to be charged from the voltage divider. A resistor is con-nected in series with the capacitor, this resistor ins-tantaneously providing a supply voltage to the control device of the thyristor when an overvoltage appears across the thyristor.
Description
The present invention relates to a -thyristor valve for a high voltage convertor having a plurality of series-connected thyristors and having voltage dividers connected in parallel with the thyristors. The thyristors are provided with capacltors ~or supplying -their control devices, these capaci-tors being supplied from taps on the voltage dividers.
Thyristor valves of the above-mentioned kind are previously known. In certain cases a very rapid ignition of at least one or a few of the thyristors in the valve is required, for example in the event of a transient overvolt-age. If such an overvoltage occurs at a moment when the above-mentioned capacitor is not charged, it will take a, certain time, because of the impedance of -the voltage di-lS vider, before the capacitor is charged -to such a -voltage level that the con-trol device becomes operational and igni-tion o~ the thyristor may take place. In the event of rapidly growing overvol-tages in connection with valves of this kind, thyristors may therefore become destroyed be-fore being ignited by their control devices.
The invention aims to provide a thyristor valveof the above-mentioned kind, in which a suEficien-t supply volta~e to the control device for ignition of the -thyristor always exists before the voltage across the thyristor has increased to a harmful level.
More particularly, -the present invention relates to a thyristor valve for a high voltage convertor having a plurality of series-connec-ted thyristors each provided with a control device, and having a voltage divider con-nected in parallel with each -thyristor, each thyristor being also provided wi-th a capaci-tor r supplied from a tap on the voltage divider connected in parallel with this thyristor, for supplying the control device of this ; thyristor. The thyristor valve is characterised in that each capacitor is connected in series with a resistor to form a series-connection having two terminals, these .~
~ ~6~09 terminals being connected to the voltage divider for charging the capacitor and -to a supply connec-tion means of the control device for feeding a suppl.y voltage to this con-trol device, whereby in response to a step voltage across the thyristor, a supply vol-tage is immediately delivered to the control device, which supply voltage having a sufficient magnitude to enable firing of the thyristor and a prevention of a destruction of this thyristor through the overvoltage. In a preferred embodi-men-t, a diode is connected in parallel with the resistor for a rapid discharge of -the capacitor to -the control device.
In the following~ a preferred embodiment of the presen-t invention will be described with reference to the . accompa.nying figure, which figure shows a thyristor valve, including the characteristics of the invention, with a thyristor having an associated control device and voltage divider.
The thyristor T is one of the series-connected thyristors which are included in the valve. The -thyristor is provided with a control device SD, connected to -the gate of the thyristor, for ignition of the thyristor. The ignition of the thyristor is normally carried out upon the receipt of an optical ignition signal via the photo-diode FD. To protect the thyristor in the event of an overvoltage in the o~f-s-tate, the con-trol device is also adapted to ignite the thyristor as soon as the off state voltage of the thyristor reaches a predetermined level.
A voltage divider, consisting of the capacitor C1, the resistor R1 and the ~ener diode ~D, is connected in parallel with the thyristor. Capacitor C2, which constitutes an energy storage for the con-trol device, is charged from the voltage divider via a diode Dl. In series with the capacitor C2 there is arranged a resistor R2 and in parallel with the resistor there is arranged a diode D2, through which the capacitor can be rapidly
Thyristor valves of the above-mentioned kind are previously known. In certain cases a very rapid ignition of at least one or a few of the thyristors in the valve is required, for example in the event of a transient overvolt-age. If such an overvoltage occurs at a moment when the above-mentioned capacitor is not charged, it will take a, certain time, because of the impedance of -the voltage di-lS vider, before the capacitor is charged -to such a -voltage level that the con-trol device becomes operational and igni-tion o~ the thyristor may take place. In the event of rapidly growing overvol-tages in connection with valves of this kind, thyristors may therefore become destroyed be-fore being ignited by their control devices.
The invention aims to provide a thyristor valveof the above-mentioned kind, in which a suEficien-t supply volta~e to the control device for ignition of the -thyristor always exists before the voltage across the thyristor has increased to a harmful level.
More particularly, -the present invention relates to a thyristor valve for a high voltage convertor having a plurality of series-connec-ted thyristors each provided with a control device, and having a voltage divider con-nected in parallel with each -thyristor, each thyristor being also provided wi-th a capaci-tor r supplied from a tap on the voltage divider connected in parallel with this thyristor, for supplying the control device of this ; thyristor. The thyristor valve is characterised in that each capacitor is connected in series with a resistor to form a series-connection having two terminals, these .~
~ ~6~09 terminals being connected to the voltage divider for charging the capacitor and -to a supply connec-tion means of the control device for feeding a suppl.y voltage to this con-trol device, whereby in response to a step voltage across the thyristor, a supply vol-tage is immediately delivered to the control device, which supply voltage having a sufficient magnitude to enable firing of the thyristor and a prevention of a destruction of this thyristor through the overvoltage. In a preferred embodi-men-t, a diode is connected in parallel with the resistor for a rapid discharge of -the capacitor to -the control device.
In the following~ a preferred embodiment of the presen-t invention will be described with reference to the . accompa.nying figure, which figure shows a thyristor valve, including the characteristics of the invention, with a thyristor having an associated control device and voltage divider.
The thyristor T is one of the series-connected thyristors which are included in the valve. The -thyristor is provided with a control device SD, connected to -the gate of the thyristor, for ignition of the thyristor. The ignition of the thyristor is normally carried out upon the receipt of an optical ignition signal via the photo-diode FD. To protect the thyristor in the event of an overvoltage in the o~f-s-tate, the con-trol device is also adapted to ignite the thyristor as soon as the off state voltage of the thyristor reaches a predetermined level.
A voltage divider, consisting of the capacitor C1, the resistor R1 and the ~ener diode ~D, is connected in parallel with the thyristor. Capacitor C2, which constitutes an energy storage for the con-trol device, is charged from the voltage divider via a diode Dl. In series with the capacitor C2 there is arranged a resistor R2 and in parallel with the resistor there is arranged a diode D2, through which the capacitor can be rapidly
2 -~ ..
~ ~6309 discharged to the control device via -the supply connection S
of said control device. In the event of a rela-tively slowly growing overvol-tage, the capacitor C2 has time to be charged to a sufficient voltage level for opera~tion of the control device before the thyris-tor voltage reaches harmful values, and upon ignition of the thyris-tor the capacitor is rapidly discharged through diode D2 to the control device and via the control device to the gate of the thyristor. In the event of a very rapidly growing overvoltage, the capacitor will not have time to be charged sufficiently rapidly.
However, a voltage drop is obtained instantaneously across the resistor R2~ and thus supply voltage is delivered to the control device. By adjusting the resistance of the resistor R2 in a suitable manner to the other impedances of the voltage divider circuit, it may be ensured that sufficient supply voltage is always delivered to the control device before the thyristor voltage has time to assume a detrimental level.
The diode D2 may in certain cases be omitted, for example when the resistor R2 has low resistance.
..~ 3 .~ ~
~ ~6309 discharged to the control device via -the supply connection S
of said control device. In the event of a rela-tively slowly growing overvol-tage, the capacitor C2 has time to be charged to a sufficient voltage level for opera~tion of the control device before the thyris-tor voltage reaches harmful values, and upon ignition of the thyris-tor the capacitor is rapidly discharged through diode D2 to the control device and via the control device to the gate of the thyristor. In the event of a very rapidly growing overvoltage, the capacitor will not have time to be charged sufficiently rapidly.
However, a voltage drop is obtained instantaneously across the resistor R2~ and thus supply voltage is delivered to the control device. By adjusting the resistance of the resistor R2 in a suitable manner to the other impedances of the voltage divider circuit, it may be ensured that sufficient supply voltage is always delivered to the control device before the thyristor voltage has time to assume a detrimental level.
The diode D2 may in certain cases be omitted, for example when the resistor R2 has low resistance.
..~ 3 .~ ~
Claims (2)
1. Thyristor valve for a high voltage convertor having a plurality of series-connected thyristors each pro-vided with a control device, and having a voltage divider connected in parallel with each thyristor, each thyristor being also provided with a capacitor, supplied from a tap on the voltage divider connected in parallel with this thyristor, for supplying the control device of this thyristor, characterised in that each capacitor is connected in series with a resistor to form a series-connection having two terminals, said terminals being connected to the voltage divider for charging the capacitor and to a supply connection means of the control device for feeding a supply voltage to this control device, whereby in response to a step voltage across the thyristor, a supply voltage is immediately delivered to the control device, which supply voltage having a sufficient magnitude to enable firing of the thyristor and a prevention of a destruction of this thyristor through said overvoltage.
2. Thyristor valve according to claim 1, charac-terised in that a diode is connected in parallel with the resistor for a rapid discharge of the capacitor to the control device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7909313-4 | 1979-11-12 | ||
| SE7909313A SE419149B (en) | 1979-11-12 | 1979-11-12 | TURISTOR VALVE FOR HIGH VOLTAGE CONVERTER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1166309A true CA1166309A (en) | 1984-04-24 |
Family
ID=20339289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000364348A Expired CA1166309A (en) | 1979-11-12 | 1980-11-10 | Thyristor valve for a high voltage convertor |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0028784B2 (en) |
| JP (1) | JPS5683262A (en) |
| BR (1) | BR8007323A (en) |
| CA (1) | CA1166309A (en) |
| DE (1) | DE3062777D1 (en) |
| SE (1) | SE419149B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3426766A1 (en) * | 1984-07-17 | 1986-01-23 | Siemens Ag | CIRCUIT ARRANGEMENT FOR MONITORING A THYRISTOR |
| SE517688C2 (en) * | 1997-03-24 | 2002-07-02 | Abb Ab | Method and apparatus for handling a short-circuit situation occurring in a circuit with several series-switchable extinguishers |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE360228B (en) * | 1972-02-01 | 1973-09-17 | Asea Ab | |
| SE369257B (en) * | 1972-12-08 | 1974-08-12 | Asea Ab | |
| BE798049A (en) * | 1973-04-11 | 1973-10-11 | Acec | CONTROL DEVICE FOR THYRISTORS OR OTHER SEMICONDUCTOR ELEMENTS |
| JPS5125058A (en) * | 1974-08-26 | 1976-03-01 | Mitsubishi Electric Corp | Sairisutano torigahoshiki |
-
1979
- 1979-11-12 SE SE7909313A patent/SE419149B/en unknown
-
1980
- 1980-11-03 DE DE8080106737T patent/DE3062777D1/en not_active Expired
- 1980-11-03 EP EP80106737A patent/EP0028784B2/en not_active Expired - Lifetime
- 1980-11-10 JP JP15808080A patent/JPS5683262A/en active Pending
- 1980-11-10 CA CA000364348A patent/CA1166309A/en not_active Expired
- 1980-11-11 BR BR8007323A patent/BR8007323A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| SE7909313L (en) | 1981-05-13 |
| DE3062777D1 (en) | 1983-05-19 |
| EP0028784B1 (en) | 1983-04-13 |
| SE419149B (en) | 1981-07-13 |
| EP0028784B2 (en) | 1990-01-03 |
| BR8007323A (en) | 1981-05-26 |
| JPS5683262A (en) | 1981-07-07 |
| EP0028784A1 (en) | 1981-05-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |