AU617832B2 - Transient and overvoltage protection circuit for electronic devices - Google Patents
Transient and overvoltage protection circuit for electronic devices Download PDFInfo
- Publication number
- AU617832B2 AU617832B2 AU37926/89A AU3792689A AU617832B2 AU 617832 B2 AU617832 B2 AU 617832B2 AU 37926/89 A AU37926/89 A AU 37926/89A AU 3792689 A AU3792689 A AU 3792689A AU 617832 B2 AU617832 B2 AU 617832B2
- Authority
- AU
- Australia
- Prior art keywords
- transient
- protection circuit
- electronic devices
- output
- comparator
- 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.)
- Ceased
Links
- 230000001052 transient effect Effects 0.000 title claims description 31
- 230000005669 field effect Effects 0.000 claims description 16
- 239000003990 capacitor Substances 0.000 claims description 5
- 235000009917 Crataegus X brevipes Nutrition 0.000 claims 1
- 235000013204 Crataegus X haemacarpa Nutrition 0.000 claims 1
- 235000009685 Crataegus X maligna Nutrition 0.000 claims 1
- 235000009444 Crataegus X rubrocarnea Nutrition 0.000 claims 1
- 235000009486 Crataegus bullatus Nutrition 0.000 claims 1
- 235000017181 Crataegus chrysocarpa Nutrition 0.000 claims 1
- 235000009682 Crataegus limnophila Nutrition 0.000 claims 1
- 235000004423 Crataegus monogyna Nutrition 0.000 claims 1
- 240000000171 Crataegus monogyna Species 0.000 claims 1
- 235000002313 Crataegus paludosa Nutrition 0.000 claims 1
- 235000009840 Crataegus x incaedua Nutrition 0.000 claims 1
- 210000002837 heart atrium Anatomy 0.000 claims 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
Description
617832 COMMONWEALTH OF AUSTRALIA PATENTS ACT 1952-69 COMPLETE SPECIFICATION
(ORIGINAL)
Class Application Number: Lodged: Form nt. Class o0 Complete Specification Lodged: a Accepted: o Published: 0 Re iority RPJated Art: ro o 0 0 SName of Applicant: 0 SAddress of Applicant: SActual Inventor: Address for Service Address for Service WERKZEUGMASCHINENFABRIK OERLIKON-BUHRLE AG Birchstrasse 155, 8050 Zurich, Switzerland RUDOLF BARTSCH and FELIX JETZER Watermark Patent Trademark Attorneys 50 QUEEN STREET, MELBOURNE, AUSTRALIA, 3000.
Complete Specification for the invention entitled: TRANSIENT AND OVERVOLTAGE PROTECTION CIRCUIT FOR ELECTRONIC DEVICES The following statement is a full description of this invention, including the best method of performing it known to US 2 Transient and Overvoltage Protection Circuit for Electronic Devices The present invention relates to a Transient and overvoltage protection circuit for eiectronic devices, in particular for the braking system of a rail-bound vehicle.
Various limiting circuits providing protection against overvoltages are known in practice, which switch off a device or interrupt the current supply when a certain fault appears. After the fault condition has ceased, the limiting circuits have either to be replaced, such as, for example, in the case of fuses, or have to be reset manually, such as, for example, in the case of protective circuitbreakers.
The present invention as described in the claims achieves the object of providing a Transient and overvoltage protection circuit for electronic devices, which is a:i characterised by simple circuit design, and which protects the device against faults and o damage caused by transients and overvoltages, and which automatically reconnects the ot 5 current supply to the device after the fault condition has ceased.
S: The present invention provides a transient and overvoltage protection circuit for connection between a current source and electronic devices to be protected, in particular for the braking system of a rail-bound vehicle, characterised by *aa an input stage designed as high voltage limiting circuit and being connected in parallel with the input of the protection circuit, 0 a, a voltage divider following the input stage and being connected in parallel with the latter, a a comparator with an internal reference voltage, following the voltage divider, .o with the input of said comparator being connected to the output of the voltage divider, a stabilised and overvoltage protected power supply for comparator, a first electronic switch and second electronic switch, with the first elE.tronic switch, whose switching input is connected to the output of comparator, with the second electronic switch which is connected between input and output of the protection circuit and whose switching input is connected to the output of the first electronic switch, and the current source being automatically reconnected to the device after a fault condition has ceased.
The advantages offered by the present invention are, essentially, that the protection circuit is practically independent of the magnitude of the fault, and that its power consumption when operating in the case of a fault is small.
An embodiment of the present invention shown by way of example is explained in the following with reference to the single drawing showing a circuit diagram.
LLICI~Z-
L. C i__ 2a According to the single drawing, a protection circuit in accordance with the present invention is designed, by way of example, as an adaptor connected between a current source and a device to be protected, both not being shown in the drawing, and comprises the following stages: an input stage 1 connected in parallel to the input and being designed as a high voltage limiting circuit, a voltage divider 2 following the input stage 1 and being connected in parallel to the latter, a comparator 3 following the voltage divider 2 and being connected in parallel to the latter, a power supply 4 for the comparator 3, a first electronic switch 5 following the comparator 3, and a second electronic switch 6 connected between input and output of the protection circuit, and being controlled by the first electronic switch '.4 \J-rL n~;9 4~/Z 1 i" .4 S 3 The input stage 1 comprises a transient protection diode VI and a capacitor CI connected in parallel with the latter. The voltlage divider 2 comprises two resistors R1 and R2 connected in series, and a transient protection diode V2 connected in parallel with resistor R2. The voltage across resistor R2 being the output voltage from voltage divider 2 is applied as input voltage to comparator 3. Comparator 3 is a commercially available component A resistor R8 is connected between the output of 1) and the negative potential of the protection circuit. Comparator Dl is fed from the positive potential of the protection circuit via resistors R3 and R4 connected in parallel, with the supply voltage to comparator Dl being stabilized and protected against voltage surges by a transient protection diode V4 and a capacitor C2 connected in parallel with the latter. The first electronic switch 5 is, for example, a field effect transistor TI, with the gate G of the latter heing connected to ,,tlhe output of comparator 3, the source S of TI being connected directly to the niegative potential, and the drain D of TI being connected via a transient proo :tection diode V5 with the negative potential. Also the second electronic :0 switch is a field effect transistor T2, with its drain I) and source S being Sconnected between input and output of the protection circuit, and its gate G Sbeing connected via a resistor R5 with its drain D, and via a transient protection diode V3 with its s. rce S, as well as via reistor R6, being allocated in this example to the first electronic switch 5, with the drain D of the first electronic switch 0o o ,,o°T1e protection circuit operates as follows: All voltages higher than the breakdown voltage of the transient protection diode VI, whose theoretical *,raction time is, for example, of the order of 1 ps, are limited to a permissible voltage level, depending on the leakage current. Capacitor CI of tlhe input stage 1 together with the line inductivity and the internal resistance Q: ;,o 0 f the current source, not being shown here, acts as filter against high frequency interference voltages, with the limit frequency being determined mainly by the inductivity of the line. An input signal is fed via the voltage divider Rl, R2 to comparator DI. If the output voltage of voltage divider 2 or tihe input voltage of comparator Dl, respectively, exceeds the internal reference voltage of comparator D1, a voltage from the output of comparator 01 is applied to field effect transistor U1 and switches the latter to the conducting state. Consequently, drain D of field effect transistor Ti lowers, via resistor R6, the voltage level at gate G of field effect transistor T2, such that field effect transistor T2 has now a high resistance. Tle transient protection diode V3 becomes conducting .in the forward direction and thereby discharges capacities acting at the output of the protection circuit, not; shown r. 4 here, via resistor R6 and the field effect transistor Tl. The transient protection diode V3 also protects, in an ideal manner, the gate-source section of field effect transistor T2.
The transient protection diode V5 limits overswinging on switching off of the load, and at the same time protects field effect transistor Ti against impermissible overvoltages at the drain 0. In case of a short-circuit of field effect transistor T2, the transient protection diode V5 imits the output voltage UA of the protection circuit, and thereby protects the load, withi the transient protection diode V5 being short-circuited in the case of this fault.
Ile output voltage UA is made zero when a predetermined input overvoltage is appl ied for a length of time exceeding, for example, 1.5 ps. As soon as I.he input voltage UE drops again to the permissible level, the input of Ilhe protection circuit is connected to its output by restituting the normal operating state in which there is ro output from Ilie comparator DI and therefore field effect transistor TI is in the bicoked state and, consequently, the gate of field effect transistor T2 maintains the latter in the conducting state via oo* resistor 15. The voltage drop across the drain-source section of field effect transistor T2 is, for example, approximately 4 volts.
0800 o 00 0 00 O 000
Claims (9)
1. A transient and overvoltage protection circuit for connection between a current source and electronic devices to be protected, in particular for the braking system of a rail-bound vehicle, characterised by an input stage designed as high voltage limiting circuit and being connected in parallel with the input of the protection circuit, a voltage divider following the input stage and being connected in parallel with the latter, a comparator with an internal reference voltage, following the voltage divider, with the input of said comparator being connected to the output of the voltage divider, S- a stabilised and overvoltage protected power supply for comparator, a first electronic switch and second electronic switch, with the first electronic i switch, whose switching input is connected to the output of comparator, with the second electronic switch which is connected between input and output of the protection circuit and whose switching input is connected to the output of the first electronic switch, and °0 the current source being automatically reconnected to the device after a fault 00, condition has ceased.
2. A transient and overvoltage protection circuit for electronic devices according to claim 1, characterised by a transient protection diode VI eing provided in the input stage and being connected between positive and the ngaiy- peteial of the protection circuit.
3. A transient and overvoltage protection circuit for electronic devices according to claim 2, characterised by a 6_J r -6- capacitor C1 being connected in parallel with the transient protection diode VI.
4. A transient and overvoltage protection circuit for electronic devices according to one of the preceding claims 1 to 3, characterized by a transient protection diode V2 being connected between the output of the voltage divider and the negative potential of the protection circuit.
A transient and overvoltage protection circuit for electronic devices according to one of the claims 1 to 4, characterized by a transient protection diode V4 and a capacitor C2 both connected in parallel with the comparator between the output of the power supply and the negative potential of the protection circuit.
6. A transient and overvoltage protection circuit for 0 00 o electronic devices according to one of the preceding claims 1 to 5, characterized by two field effect transistors T1 and T2 being provided as electronic switches. o 0 o
7. A transient and overvoltage protection circuit fc' electronic devices according to claim 6, characterized by a transient protection diode V5 being connected between th. drain D of the field effect transistor T1 and the negat-ve 0 0 o. potential of the protection circuit.
8. A transient and overvoltage protection cire t for electronic devices according to one of the claims 6 7, characterized by a transient protection diode V3 bei-.g ooo connected between the gate G and the source S of thel field effect transistor T2. 4 4 i~~ -7-
9. A circuit according to claim 1, substantially as herein described with reference to the accompanying drawing. DATED this 17th day of April 1991 WERKZEUGMASCHINENFABRIK OERLIKON-BUHRLE AG 0 00 0000 o #0 o 00 00 0 00 0 0 0 WATERMARK PATENT TRADEMARK ATTORNEYS THE ATRIUM 290 BURWOOD ROAD HAWTHORN, VICTORIA 3122 AUSTRALIA -64000 0 00 00 0 00 LJD:RCTS:EH
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH2597/88 | 1988-07-07 | ||
| CH259788 | 1988-07-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU3792689A AU3792689A (en) | 1990-01-11 |
| AU617832B2 true AU617832B2 (en) | 1991-12-05 |
Family
ID=4237352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU37926/89A Ceased AU617832B2 (en) | 1988-07-07 | 1989-07-06 | Transient and overvoltage protection circuit for electronic devices |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0349750A1 (en) |
| AU (1) | AU617832B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4000637A1 (en) * | 1990-01-11 | 1991-07-18 | Vdo Schindling | CIRCUIT ARRANGEMENT TO PROTECT A CONSUMER |
| US7675726B2 (en) | 2003-07-28 | 2010-03-09 | Siemens Aktiengesellschaft | Device for protecting electronic modules in a multi-voltage on-board electrical system against short circuits |
| DE102007017858A1 (en) * | 2006-12-29 | 2008-07-03 | Phoenix Contact Gmbh & Co. Kg | Voltage protection arrangement for electronic device i.e. controller, has voltage detecting unit including switching output connected with output of voltage comparator for indication of impermissible voltage |
| DE102008051514B4 (en) | 2008-10-14 | 2022-08-25 | Robert Bosch Gmbh | Voltage monitoring arrangement for a security module |
| US8324812B2 (en) | 2009-03-24 | 2012-12-04 | General Electric Company | Protecting ballast circuitry against miswiring |
| DE102011080523A1 (en) * | 2011-08-05 | 2013-02-07 | Siemens Aktiengesellschaft | Arc fault protection switch with overvoltage protection |
| DE102013005657A1 (en) | 2013-02-05 | 2014-08-07 | Dehn + Söhne Gmbh + Co. Kg | Device for overvoltage protection by discharging of transient noise from power supply network, provides variable impedance that displace transient disturbances into non-conducting off state, when voltage from supply network is low |
| US20140362485A1 (en) * | 2013-06-06 | 2014-12-11 | William Smith | Transient Protection Filter Circuit that Minimizes the Effects of Thermal Runaway |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0033368A2 (en) * | 1980-01-31 | 1981-08-12 | ANT Nachrichtentechnik GmbH | Method of protecting a D.C. converter against excessive voltages |
| WO1986002786A1 (en) * | 1984-10-24 | 1986-05-09 | Om Ahuja | Auto-reset circuit breaker |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2548839B1 (en) * | 1983-07-08 | 1986-02-28 | Peugeot | CONTROL AND / OR CONTROL INSTALLATION COMPRISING A DEVICE FOR THE PROTECTION OF ENERGY CONSUMERS, AND FOR THE SUPPLY LINE OF SUCH CONSUMERS |
| DE3402222A1 (en) * | 1984-01-24 | 1985-07-25 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Circuit arrangement for limiting overvoltages |
| DE3425235C1 (en) * | 1984-07-14 | 1992-03-12 | bso Steuerungstechnik GmbH, 6603 Sulzbach | Circuit arrangement for protecting electronic circuits against overvoltage |
| DE3526177A1 (en) * | 1985-07-23 | 1987-02-05 | Bosch Gmbh Robert | R-VOLTAGE PROTECTION CIRCUIT |
-
1989
- 1989-05-26 EP EP89109564A patent/EP0349750A1/en not_active Ceased
- 1989-07-06 AU AU37926/89A patent/AU617832B2/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0033368A2 (en) * | 1980-01-31 | 1981-08-12 | ANT Nachrichtentechnik GmbH | Method of protecting a D.C. converter against excessive voltages |
| WO1986002786A1 (en) * | 1984-10-24 | 1986-05-09 | Om Ahuja | Auto-reset circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| AU3792689A (en) | 1990-01-11 |
| EP0349750A1 (en) | 1990-01-10 |
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