CN1334984B - Current limiting device - Google Patents
Current limiting device Download PDFInfo
- Publication number
- CN1334984B CN1334984B CN998158801A CN99815880A CN1334984B CN 1334984 B CN1334984 B CN 1334984B CN 998158801 A CN998158801 A CN 998158801A CN 99815880 A CN99815880 A CN 99815880A CN 1334984 B CN1334984 B CN 1334984B
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- China
- Prior art keywords
- load
- current
- semiconductor device
- current limiting
- limiting device
- 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 - Fee Related
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/025—Current limitation using field effect transistors
-
- 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
- H02H3/08—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 current
- H02H3/093—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 current with timing means
Abstract
A current limiting device for connection in use between an AC mains power source and a load. The unit has a controllable semi-conductor device Q3 in the current carrying path between the source and the load. Also in the path is a sensing resistor R2. The unit also has circuit means responsive to the voltage developed across the sensing resistor R2. The circuit means acts to turn off the semi-conductor device in the event that the current flow in the load exceeds a predetermined level. The current flow is permitted to exceed the predetermined level for a period of time, the period being less for higher excess currents and turn off is virtually instantaneous in the event of a short circuit of the load or a sudden or very high current flow. The semi-conductor device may be turned back on after turn off, but only after a predetermined time has elapsed and not until the load is disconnected.
Description
The present invention relates to a kind of current limiting device that is used to be connected between ac main power and the load, described device is used for when electric current surpasses the value of setting load current being reduced to 0 or little residual electricity flow valuve.
The electric control unit of form known comprises simple fuse and electro-mechanical circuit interrupter or demand limiter.Under the situation of fuse, in case circuit is cut off, then fuse must be replaced, and under the situation of electro-mechanical circuit interrupter or demand limiter, then it must be resetted.Therefore, these devices must be come-at-able, thereby these devices are opened, thereby are used unreasonably.In some electric power systems, normal ammeter is removed, and charges to the user according to the maximum current that demand limiter allowed.Allow the user in all time, to draw maximum current, obvious, if demand limiter allows the user near so that reset, just might or pass through the limiter bypass is perhaps practiced fraud by the operation of disturbance current limiter.
The invention provides a kind of current limiting device, comprise circuit input and output terminal, be used in use between a terminal of terminal of ac main power and load, connecting, controlled semiconductor device, it is formed on the part of the current-carrying path between described input and the output, detection resistance in described current-carrying path, with the circuit arrangement of response at the voltage of described detection resistance two ends generation, described circuit arrangement surpasses under the situation of predetermined value at the electric current that flows through load ends described semiconductor device, described circuit arrangement comprises deferred mount, thereby make that electric current can surpass described predetermined value in a limited time interval, for higher overcurrent, the described limited time interval is shorter, in load short circuits or under the situation of a unexpected or very high electric current, the described time interval is actually 0.Thereby when semiconductor device was in its conducting state, electric current flow through load.Yet, when semiconductor device when being non-conduction, the electric current that flows through load is reduced to 0 or equal residual current at the most.
According to device of the present invention be fully electron type and do not have a moving component.By in a time interval, allowing electric current to surpass a predetermined value, can not be breaking at the electric current surge state under according to device of the present invention, for example owing to the impulse current in the electric equipment.In addition, overcurrent is big more, and cut speed is also fast more.
Under short circuit or situation, can cut off load (generally within several microseconds) apace according to device of the present invention, thereby stop the electronic circuit in the breaking plant in overcurrent.When described device during as the demand limiter in user's power supply, this is important, because the user may attempt to make limiter to lose efficacy and obtain extra electric energy.By repeatedly making load short circuits that dynamo-electric limiter was lost efficacy.Robustness at the short circuit condition lower device makes it can be installed in the circuit with low-down impedance.This means that again described device can be installed in the outside of user power utilization inlet.
In general, when electric current surpasses 50 times of predetermined values the break time of device less than 10 microseconds.When electric current surpassed predetermined value twice or three times, can be the order of magnitude of a second or several seconds break time, and at electric current during greater than 10 times of predetermined value, and described device can be at the time internal cutting off circuit of the order of magnitude of a few tens of milliseconds.
Under short circuit or overcurrent condition according to the cut-off velocity of device of the present invention than approximately fast 1000 times of fuse or electro-mechanical circuit interrupter.Therefore, can be used to reduce under failure condition destruction, thereby improve fail safe, in particular in flammable or the explosion environment time electric equipment or electronic equipment.
Generally also comprise diode rectifier bridge according to device of the present invention.
Preferably include the device that is used for after described semiconductor device ends, making again its conducting according to device of the present invention.Can comprise timer arrangement, it can make after semiconductor device ends by operation and make its conducting through the scheduled time.Also can comprise inhibiting apparatus, be used to forbid the conducting of described semiconductor device, be cut off up to load.
When described device during as the limiter in user's power supply, automatic resetting characteristics is useful, because this makes described device can be installed in maccessiable position, for example be connected on the electric pole of power supply usefulness, so as to reduce with by bypass with distort relevant malpractices problem.In addition, automatic resetting characteristics makes no longer needs removable element, fuse for example, and make device to be sealed fully, damage owing to the intrusion of operating environment or insect so as to avoiding.
Particularly, in this application, be preferably in preset time and postpone to automatically reset afterwards.This delay can be several seconds orders of magnitude to a few minutes, general 5 seconds to 60 seconds.In general, delay should be enough, so that make the user can cut off load, electric current is reduced to less than the predetermined value that semiconductor device is ended, and the user was cut off the power supply in a long time.Suitable delay approximately is 30 seconds.In a practical application, described device can constitute by this way, and it allows user to draw enough electric currents that is used for to the electric light power supply of specified quantity.If this moment, the user connected other electric light, thereby surpass the predetermined current value, described semiconductor device just ends, thereby stops the supply of electric current.30 seconds delay this moment enough makes the user cut off unnecessary electric light, makes when postponing to finish, and when the supply of restoring current, no longer trips.If the user does not cut off additional electric light, then repeat power failure and the processing that is connected again, fully reduced up to load, make electric current drop to below the predetermined restriction.
Described device preferably is installed in the position between power supply leader cable and user's the electricity consumption inlet, is promptly belonging to by the power supply department management rather than by the position of user management.The also best quilt of described device encapsulates fully and seals, and makes Any user not distort.
Described device preferably also comprises in addition and is used to guarantee make the device of semiconductor device conducting in the zone of alternating voltage zero-crossing when load is connected.
Connect load when the voltage zero-cross by making when resetting, can reduce relevant stress in impulse current and the load, make the electromagnetic interference minimum according to device of the present invention.
Preferably also be included in described supply voltage according to device of the present invention and be lower than under the situation of a predetermined value device that can described semiconductor device be ended by operation.
This under voltage is by helping to protect the voltage-sensitive load; motor for example; avoid suffering damage, and the minimizing of the driving voltage that causes owing to low supply voltage of protection semiconductor device produces excessive conducting voltage and falls cause overheated owing under too low voltage, operating.
Controlled semiconductor device can be transistor, particularly igbt (IGBT).Preferably use transistor, because it can end by any point on the primary period, and for example bidirectional triode thyristor or controllable silicon can only end when voltage zero-cross.Under the situation of short circuit, transistorized fast by making device exempt from destruction, under described short-circuit condition, will destroy bidirectional triode thyristor or controllable silicon.It is specially suitable using IGBT, because this transistor transistor of form than other under short circuit condition is more healthy and stronger.
It also is specially suitable making transistor keep conducting continuously during normal running.This can eliminate radio frequency interference, and when utilizing bidirectional triode thyristor or controllable silicon, postpones to continue conducting through one after each cycle ends, and then can produce radio frequency interference.
According to another aspect of the present invention, a kind of method that is used to limit to the supply of electric power in user's house is provided, described method is included between power supply leader cable and user's the electricity consumption inlet an above-mentioned device is installed.
Example according to current limiting device of the present invention is described with reference to the accompanying drawings, wherein:
The main element of Fig. 1 indication device;
Fig. 2 represents low-tension supply, and
Fig. 3 is the figure that is similar to Fig. 1 of second embodiment of described device.
Referring to accompanying drawing, described device comprises circuit input and output terminal 10,11, is used for connecting respectively the line terminal of AC power and the line terminal of load.Described device also has neutral input and output terminal 12,13, is used to connect the neutral terminal of AC power and the neutral terminal of load.
The controlled semiconductor device Q3 that is the igbt form has collector electrode that links to each other with line 15 and the emitter that links to each other with line 14 by current sense resistor R2.In use, as long as transistor Q3 is in conducting state, at the positive half cycle of power supply, electric current just flows through load by diode D1, transistor Q3, detection resistance R 2 and diode D4, at negative half period, then flow through load by diode D2, transistor Q3, resistance R 2 and diode D3.Produce at resistance R 2 two ends and voltage that load current is directly proportional, and for maximum continued operation electric current, described voltage is the order of magnitude of 0.1V.
The driving voltage of the grid of transistor Q3 obtains by means of resistance R 3, the R4 DC power supply by 18V, and described resistance R 3, R4 are connected in series, and has the contact that the current-carrying path by means of field-effect transistor Q1 is connected with line 14.The power supply of 18V is positive with respect to line 14, and its source will illustrate below.In use, as long as transistor Q1 ends, driving voltage just is added on the grid of transistor Q3, and electric current just flows through load.When normal the use, the voltage that produces at resistance R 2 two ends does not have any influence for the effective driving voltage that offers transistor Q3, but in load under the situation of short circuit, even before making transistor Q1 conducting, transistor Q3 will be ended, and the effective driving voltage that is added on the transistor Q3 will reduce owing to the increase of the voltage on the resistance R 2.This has the electric current that reduces transistor Q3, so as to the effect of restriction power consumption wherein.
The conducting of Q1 is by comprising integrated circuit (IC) 2, and the control of the timer of a kind of timer IC of 555 types, its operation is by comprising IC1A respectively, IC1B, and 4 of IC1C and IC1D other circuit are determined.Another circuit that comprises IC1A provides maximum current control, another circuit that comprises IC1B provides the control of the quick response of serious overload and short circuit suddenly, another circuit that comprises IC1C is used to guarantee only at AC power zero cross near generation overload trip (when load connects) described device is recovered automatically, and another circuit that comprises IC1D is used to guarantee disconnect described load under supply voltage is lower than the situation of a predetermined value.
Resistance R 21 and capacitor C 5 forms the part of timers, and described resistance and electric capacity are connected in series between the anode and line 14 of DC power supply of 5V.The node of resistance and electric capacity is connected to the discharge end of a thresholding and integrated circuit (IC) 2.The control voltage rear end of IC2 links to each other by means of the resistance R 19 that is connected in series, R20 and 5V power supply, and trigger end links to each other with the 5V power supply by resistance R 14.
The trigger end of integrated circuit (IC) 2 and integrated circuit (IC) 1A, the output of IC1B and IC1D links to each other, and the following describes the peripheral circuit of these circuit.
At first consider integrated circuit (IC) 1A, this circuit is connected to a comparator, and it has the in-phase input end that links to each other with the node of a pair of resistance R 9, R10, and described resistance links to each other with line 14 with the power end of 5V respectively.Inverting input at first links to each other with the node of resistance R 2 by resistance R 6, R7 and the transistor Q3 that is connected in series, and secondly links to each other with line 14 by capacitor C 3.Therefore resistance R 9, R10 determine to be applied to the reference voltage on the comparator, determine the voltage drop at resistance R 2 two ends and make predetermined current value in the load of comparator change state.When comparator changes state, transistor Q1 conducting, transistor Q3 ends, thereby cuts off load.But, because when normal the use, for example because electric motor starting has the impulse current in surge current and inflow power supply and the lamp, these electric currents may surpass predetermined value, in this case, need to stop the cut-out load, thereby resistance R 6, R7 provide the time delay function with capacitor C 3.For higher current surge, for example when applying the oversize time, will destroy the surge current of transistor Q3, then the effect by PNP transistor Q2 is reduced the time of delay constant, and transistor Q2 inserts resistance R 8, thereby increases the charge rate of capacitor C3.
Provide above-mentioned time delay to mean under load current grows at top speed the situation of constant short circuit in load suddenly and may destroy transistor Q3.In this case, the circuit with integrated circuit (IC) 1B will stop destruction in this case, and sort circuit is owing to the voltage that can reduce on the transistor Q3 has the electric current restriction effect.IC1B is device as a comparison, and it has the in-phase input end that links to each other with the node of a pair of resistance R 11, R12, and described resistance links to each other with 5V power supply and line 14 respectively.Inverting input links to each other by means of the node of resistance R 13 with transistor Q3 and resistance R 2, one and capacitor C3 compare the capacitor C4 with low-down value and are connected between inverting input and the line 14, as high frequency filter, and can not provide big delay to the variation that comparator responds resistance R 2 both end voltage.The reference voltage that puts on comparator IC1B is much larger than the reference voltage that puts on comparator IC1A, and therefore, this comparator only changes the state when making transistor Q3 begin to end under the situation of very high electric current.
Other circuit that comprises integrated circuit (IC) 1D as shown in Figure 2, it is relevant with low-tension supply.Integrated circuit (IC) 1D also is connected to comparator, and its input links to each other with the node of resistance R 25-R27 that is connected in series and R31 respectively.Resistance R 27, R31 are connected between 5V power line 16 and the line 14, and resistance R 25, R26 are connected between the power line 17 and line 14 of 18V.The value of these resistance is such, and it makes when normal the use, is 2.5V at the voltage of the inverting input of comparator, is 3V at the voltage of in-phase input end.
Line 17 links to each other by means of the negative electrode of resistance 24 with diode D8, and the anode of diode links to each other with neutral terminal 12,13.All the other elements of power circuit comprise the storage capacitance C7 that is connected between online 17 and 14, also be connected online 17 and 14 and resistance R 23 between Zener diode D9, and the accurate reference voltage D11 that is connected on the 5V between line 17 and 14.Power line 16 links to each other with the negative electrode of resistance R 23 and diode D11.
In use, capacitor C7 is charged to the puncture voltage (18V) of Zener diode D9 at the negative half period of supply voltage, and electric current flows by diode D8, resistance 24 and diode D3.The voltage that precise voltage D11 determines on the line 16 by resistance R 23.Under the situation that the voltage of AC power reduces, before descending, voltage on the voltage on the line 17 online 16 will begin to descend, and when it is reduced to when making the voltage of in-phase input end less than the voltage of inverting input, comparator IC1D then changes state, thereby the operation of disable transistor Q3.In this way, when supply voltage is low, then protection constitute load and can be at the ruined motor of low voltage lines etc., and protective transistor Q3 can be not overheated owing to operation under too low voltage.
Other the circuit that comprises integrated circuit (IC) 1C comprise be connected in series online 14 and 5V power line 16 between a pair of resistance R 16, R17, node between described two resistance R 16, the R17 and the inverting input of integrated circuit (IC) 1C link to each other.In-phase input end links to each other by means of the base stage of resistance R 18 with NPN transistor Q4, and links to each other with line input 10 by means of resistance R 15.The output of transistorized emitter and IC1C links to each other, and collector electrode links to each other with the node of resistance R 19, R20.In addition, diode D5 that is connected in series and D6 be connected online 14 and the power line of 5V between, and be in nonconducting state with respect to the 5V power supply.Diode D5, the node of D6 links to each other with the in-phase input end of integrated circuit (IC) 1C.The purposes of diode D5, D6 be the voltage control of in-phase input end within the safe operational constraints of integrated circuit (IC) 1C, it has quite little scope than AC supply voltage.
When normal running, transistor Q1 ends because IC2 is output as low, so transistor Q3 is in conducting state, makes electric current can flow through load.If make any one comparator IC1A for above-mentioned reasons, IC1B or IC1D change state, and then the voltage at the triggering input of integrated circuit (IC) 2 is lowered, and the output of integrated circuit (IC) 2 uprises, so as to turn-on transistor Q1.Meanwhile, capacitor C 5 discharges are charged once more by resistance R 21 then, and when the voltage at C5 two ends reached expectant control voltage, IC2 was reset, and made transistor Q1 end, transistor Q3 conducting.
Have only load to be cut off just if desired and automatically reset, then use a kind of remodeling of described device shown in Figure 3.Be with the difference of the circuit of Fig. 1, transistor Q5 and resistance 30 wherein are provided.When transistor Q3 ends, there is a very little electric current to flow through load by resistance R 29, R30.This electric current produces voltage drop at resistance R 30 two ends, it makes transistor Q5 conducting, recharges so as to stoping capacitor C 5.Thereby, in case when detecting overcurrent or big surge current or low supply voltage, transistor Q3 is ended, and be held and end, be cut off up to load.When load is cut off, transistor Q5 is ended, capacitor C5 is recharged.
Although be switched " off ", still there is negligible residual current to continue to flow through load, this is not only owing to can continue to flow through electric current by resistance R 29, R30, and because for example CI and Q3 also flow through little leakage current by circuit element.
Circuit should be revised like this, makes under the situation that transistor Q3 is ended, and stops the conducting of transistor Q3, till changing by manual operation.The feature of hand-reset can be applied to all tripping operations, perhaps only is applied to some tripping operations, and can use a switch for all tripping operations, perhaps uses a switch for each tripping operation.
In order to reduce big current surge and the electromagnetic interference when making transistor Q3 conducting, the near zero-crossing point of supply voltage when making this can only occur in load and be connected can be set like this.This function is provided with relevant element by integrated circuit (IC) 1C.When supply voltage was lower than the threshold value of being determined by the relative value of resistance R 16, R17, the output of integrated circuit (IC) 1C was low.In addition, have only when supply voltage is higher than about 0.7V, transistor Q7 just is in conducting state.Therefore, between these two supply voltages, the control voltage that puts on the IC2 is reduced, thereby guarantees only near the power supply zero crossing time transistor Q1 to be ended, thereby allows electric current to flow through load by transistor Q3.Therefore, surge current in the time of device being resetted and electromagnetic interference minimum.
Only connect the zero passage connection just takes place under the loaded situation at the output that installs.Always in order to guarantee transistor conducting and, should making at L when the zero passage by means of high value resistor no matter whether be connected with load
OUTAnd between the N by a little electric current.
Automatic resetting characteristics of the present invention and do not contain this fact of moving component and mean that circuit element can be encapsulated in the housing, and be installed in maccessiable physically position in use.Control unit responds big overcurrent and short circuit very apace, so as to making the destruction minimum of contingent load or circuit.
By using precision element can reach good precision, different with the situation of fuse and thermal circuit beraker, the operation of control unit does not rely on heating, therefore the precision that can realize in a wide temperature range.By changing resistance and capacitance, described control unit can easily be applicable to different equipment.
Claims (10)
1. current limiting device, comprise circuit input and output terminal, be used in use between a terminal of terminal of ac main power and load, connecting, controlled semiconductor device, it is formed on the part of the current-carrying path between described input and the output, detection resistance in described current-carrying path, with the circuit arrangement of response at the voltage of described detection resistance two ends generation, described circuit arrangement surpasses under the situation of predetermined value at the electric current that flows through load ends described semiconductor device, described circuit arrangement comprises deferred mount, thereby make that electric current can surpass described predetermined value in a limited time interval, for higher overcurrent, the described limited time interval is shorter, in load short circuits or under the situation of a unexpected or very high electric current, the described time interval is actually 0.
2. current limiting device as claimed in claim 1 also is included in described semiconductor device by the device that automatically makes afterwards its conducting.
3. current limiting device as claimed in claim 2 wherein saidly is used to make the device of semiconductor device conducting to comprise timer arrangement, its described semiconductor device by after make described semiconductor device conducting by operation through a scheduled time.
4. current limiting device as claimed in claim 2 also comprises the device that passed through the described semiconductor device conducting of attendant exclusion before load is cut off.
5. as any one described current limiting device among the claim 2-4, also comprise when load is connected, be used to guarantee the device of crossing null range in conducting of described semiconductor device in AC power.
6. current limiting device as claimed in claim 1, wherein said detection resistance is used for reducing the electric current that flows through at described semiconductor device under the situation of load short circuits.
7. current limiting device as claimed in claim 1 also is included in described supply voltage and drops to the device that predetermined value ends described semiconductor device by operation when following.
8. current limiting device as claimed in claim 1, wherein said semiconductor device are the transistors of igbt or other type.
9. current limiting device as claimed in claim 1 also comprises diode rectifier bridge.
10. method that is used to limit to the supply of electric power in user's house, described method is included in a current limiting device of installing between power supply leader cable and user's the electricity consumption inlet, wherein said current limiting device comprises circuit input and output terminal, be used in use between a terminal of terminal of ac main power and load, connecting, controlled semiconductor device, it is formed on the part of the current-carrying path between described input and the output, detection resistance in described current-carrying path, with the circuit arrangement of response at the voltage of described detection resistance two ends generation, described circuit arrangement surpasses under the situation of predetermined value at the electric current that flows through load ends described semiconductor device, described circuit arrangement comprises deferred mount, thereby make that electric current can surpass described predetermined value in a limited time interval, for higher overcurrent, the described limited time interval is shorter, in load short circuits or under the situation of a unexpected or very high electric current, the described time interval is actually 0.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9825772.8A GB9825772D0 (en) | 1998-11-26 | 1998-11-26 | Electronic control unit |
| GB9825772.8 | 1998-11-26 | ||
| PCT/GB1999/003949 WO2000031851A1 (en) | 1998-11-26 | 1999-11-26 | Current limiting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1334984A CN1334984A (en) | 2002-02-06 |
| CN1334984B true CN1334984B (en) | 2010-06-23 |
Family
ID=10842984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN998158801A Expired - Fee Related CN1334984B (en) | 1998-11-26 | 1999-11-26 | Current limiting device |
Country Status (7)
| Country | Link |
|---|---|
| CN (1) | CN1334984B (en) |
| AP (1) | AP1325A (en) |
| AU (1) | AU1287500A (en) |
| BR (1) | BR9915680A (en) |
| GB (2) | GB9825772D0 (en) |
| WO (1) | WO2000031851A1 (en) |
| ZA (1) | ZA200104909B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1941531B (en) * | 2005-09-27 | 2010-07-21 | 浩阳半导体股份有限公司 | Three-sectional protection method for resisting overcurrent |
| CN102684178B (en) * | 2011-03-11 | 2015-05-06 | 同方泰德国际科技(北京)有限公司 | Multi-output circuit using power supply load short-circuit protection circuit |
| CN112769093B (en) * | 2019-11-05 | 2023-12-29 | 杭州海康威视数字技术股份有限公司 | Current-limiting control circuit, chip and power supply |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0600751A2 (en) * | 1992-12-04 | 1994-06-08 | Texas Instruments Incorporated | Solid state power controller |
| US5666254A (en) * | 1995-09-14 | 1997-09-09 | Raychem Corporation | Voltage sensing overcurrent protection circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL115797A0 (en) * | 1994-11-02 | 1996-01-19 | Raychem Corp | Solid state resettable overcurrent protection device |
-
1998
- 1998-11-26 GB GBGB9825772.8A patent/GB9825772D0/en not_active Ceased
-
1999
- 1999-11-26 GB GB0112029A patent/GB2359204B/en not_active Expired - Fee Related
- 1999-11-26 WO PCT/GB1999/003949 patent/WO2000031851A1/en active Application Filing
- 1999-11-26 CN CN998158801A patent/CN1334984B/en not_active Expired - Fee Related
- 1999-11-26 BR BR9915680-6A patent/BR9915680A/en not_active Application Discontinuation
- 1999-11-26 AP APAP/P/2001/002148A patent/AP1325A/en active
- 1999-11-26 AU AU12875/00A patent/AU1287500A/en not_active Abandoned
-
2001
- 2001-06-15 ZA ZA200104909A patent/ZA200104909B/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0600751A2 (en) * | 1992-12-04 | 1994-06-08 | Texas Instruments Incorporated | Solid state power controller |
| US5666254A (en) * | 1995-09-14 | 1997-09-09 | Raychem Corporation | Voltage sensing overcurrent protection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| AP2001002148A0 (en) | 2001-06-30 |
| GB2359204B (en) | 2003-02-19 |
| WO2000031851A1 (en) | 2000-06-02 |
| AP1325A (en) | 2004-11-12 |
| GB2359204A (en) | 2001-08-15 |
| BR9915680A (en) | 2001-08-14 |
| AU1287500A (en) | 2000-06-13 |
| GB0112029D0 (en) | 2001-07-11 |
| GB9825772D0 (en) | 1999-01-20 |
| CN1334984A (en) | 2002-02-06 |
| ZA200104909B (en) | 2001-12-20 |
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