WO2000019778A1 - Circuit de commande d'une charge a alimenter par une tension alternative - Google Patents
Circuit de commande d'une charge a alimenter par une tension alternative Download PDFInfo
- Publication number
- WO2000019778A1 WO2000019778A1 PCT/FR1999/002317 FR9902317W WO0019778A1 WO 2000019778 A1 WO2000019778 A1 WO 2000019778A1 FR 9902317 W FR9902317 W FR 9902317W WO 0019778 A1 WO0019778 A1 WO 0019778A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- capacitor
- load
- voltage
- resistive element
- circuit
- Prior art date
Links
Classifications
-
- 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
- H02H9/001—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
- H05B39/02—Switching on, e.g. with predetermined rate of increase of lighting current
Definitions
- the present invention relates to a circuit for controlling a load intended to be supplied by an alternating voltage.
- the invention applies more particularly to the supply of a load intended to be connected directly to a supply network of an alternating high voltage supply, for example, the mains (for example, 220 or 110 volts).
- a bulb most often "slams" when it is switched on.
- the starting overcurrent compared to the nominal current harms the life of the brushes.
- another disadvantage of an unprotected cold start for loads of this type is that this often causes a phenomenon of flickering or flickering (flicking) of the other loads possibly connected on the same power line. This phenomenon is due to peaks of inrush currents, repeated at each alternation of the alternating voltage (frequency of 50 or 60 Hz) as long as the load impedance has not reached a sufficient value. We see such a phenomenon appear, in particular, on already lit lamps, when starting an engine of a household appliance connected to the same electrical circuit.
- the first reason why one seeks to associate the load with a cot ⁇ nande circuit is a need to adjust the power of the load.
- it may be an adjustment of the light intensity for an incandescent lamp or an adjustment of the speed of rotation of a motor.
- FIG. 1 represents a first classic example of a power variator of a load 1 to be supplied with alternating current.
- the circuit of FIG. 1 currently constitutes, for a power variation control, one of the best performance / cost compromises.
- Load 1 is connected in series with a bidirectional switch, most often a triac 2, between two terminals El, E2 for applying an alternating supply voltage Vac.
- the triac 2 is generally controlled in phase angle by means of a circuit 3 connected in parallel to the triac
- the circuit 3 consists of a diac 4, connected between the trigger of the triac 2 and the midpoint A of a series association of a variable resistive element 5 with a capacitor C.
- the association in series of the element 5 and the capacitor C is connected in parallel on the triac 2.
- the variable resistive element 5 is, for example, constituted by a resistor R connected in series with a potentiometer P.
- the operation of a control circuit illustrated in Figure 1 is perfectly known. This operation is briefly recalled below in relation to FIG. 2 which represents an example of the diagram of the voltage VL at the terminals of the load 1 in steady state. It will be noted that, if the load 1 is purely resistive, the shape of the voltage V L corresponds, in steady state, also to the shape of the current II in the load.
- the triac 2 is blocked and the voltage Vj. across the load 1 is zero. It is assumed that the resistance R is of very high value so that the impedance of the load 1 is negligible compared to this value.
- the capacitor C charges through the resistor R and the potentiometer P.
- the voltage ⁇ across the capacitor C reaches the threshold voltage of the diac 4
- the latter enters in conduction and a current then flows in the trigger of the triac 2.
- the triac starts and the voltage across the terminals of the load 1 becomes the voltage Vac by neglecting the voltage drop in the triac 2.
- the triac 2 is blocked by disappearance of the current which crosses it, and the operation described above is repeated at the following half-cycles.
- the variation in power per phase angle is obtained by varying the value of the resistance of the element 5 by a variation of the potentiometer P.
- the larger the value of the potentiometer P the longer the capacitor C will be present a sufficient voltage across its terminals to trigger the diac 4, and the later the time to is compared to the start of the alternation.
- the circuit as represented in FIG. 1 operates correctly in variation of power.
- the document US-A-4680536 describes a control circuit of the type to which the invention relates and based on the diagram of FIG. 1.
- the circuit of this document comprises a rectifier bridge whose input terminals are connected between the common terminal of the resistor and the potentiometer and the cotmtune terminal of the triac and the load.
- the bridge includes in its diagonal, a second resistor, a second capacitor and a Zener diode. The purpose of such a circuit is to limit the current peaks in the ignition charge.
- a drawback of this circuit is that it requires a voltage limiting component (Zener diode) to limit the voltage of the diagonal of the bridge (across the second capacitor), otherwise this voltage could reach the peak value of the voltage alternative.
- Another drawback is that the second capacitor still sees a relatively high voltage (greater than the reversal voltage of the diac, so that the circuit requires two capacitors having to support a voltage greater than the reversal voltage of the diac.
- FIG. 3 represents a second classic example of a control circuit for a triac 2 connected in series with a load 1 to be supplied by means of an alternating voltage Vac.
- the circuit of FIG. 3 aims not only to allow a variation of power of the load 1 in steady state but also to limit the inrush current at start-up, that is to say as long as the impedance of the load is low in front of its established regime impedance.
- Such a circuit requires a block 6 for controlling the triac itself and a power block 7.
- block 6 is generally produced in the form of an integrated circuit and therefore needs to be supplied by a regulated voltage supplied by block 7.
- Block 6 is connected in parallel with triac 2, therefore connected between the terminals El and B of the assembly.
- Block 7 is connected to the supply terminals E1 and E2 and must include a reference link to node B.
- An output of block 6 is connected to the trigger of triac 2 to control it while an output of block 7 delivers a regulated DC voltage to block 6.
- FIG. 3 An arrangement as illustrated in FIG. 3 makes it possible to obtain satisfactory results, both for the power variation and for the limitation of the current draw in transient state.
- the present invention aims to propose a new solution to solve the problem of the inrush current at the start of loads to be supplied by an alternating voltage by overcoming at least one drawback of the known solutions.
- the invention aims, in particular, to propose a solution which allows, not only, a variation of the power of the load in steady state, but also, a limitation of the inrush current while the load has a low impedance transient.
- the present invention also aims to propose a solution which is particularly simple to implement and which is inexpensive compared to conventional integrated circuit solutions.
- the invention also aims to minimize the number of components necessary for the construction of the circuit and, in particular, to avoid the use of voltage limiting components as in the document US-A-4680536 cited above.
- the invention further aims to avoid the use of two capacitors having to withstand a voltage greater than the return voltage of a bi-directional conduction element (diac) used to control a bi-directional switch (triac) controlled by phase angle.
- diac bi-directional conduction element
- triac bi-directional switch
- the present invention provides a circuit for controlling a load capable of being supplied with alternating current, of the type comprising a bidirectional switch and controllable by phase angle, in series with the load between two application terminals of the alternating supply, and comprising, in parallel with the switch, a first resistive element, a first capacitor and an element, in series with said first resistive element and said first capacitor, and operating, in steady state, as a voltage source constant, the midpoint of the series association of the first resistive element and the first capacitor being connected, via a bi-directional conduction element triggered automatically when the voltage across its terminals exceeds a predetermined threshold, at a terminal of switch control.
- the element in series with the first resistive element and the first capacitor consists of a rectifying bridge in the diagonal of which are associated, in parallel, a second capacitor and a second resistive element.
- the value of the second capacitor is large compared to the value of the first capacitor.
- the first resistive element is a fixed resistance, the second resistive element being a variable resistance.
- the first resistive element is a variable resistance
- the second resistive element being a fixed resistance
- the bidirectional switch is a triac.
- the bi-directional conduction element triggered automatically is a diac.
- FIG. 4 represents a preferred embodiment of a circuit for controlling a load to be supplied by an alternating voltage according to the present invention
- Figure 5 is a simplified equivalent diagram of the circuit of Figure 4 in steady state
- FIG. G illustrates, in the form of timing diagrams, the shape of different voltages and current characteristic of the circuit of the invention.
- FIG. 4 represents an embodiment of a circuit for controlling a load 1 intended to be supplied by an alternating voltage Vac according to the present invention.
- the load 1 is connected in series with a triac 2, or any similar bidirectional switch, between two terminals El, E2 for applying the voltage Vac.
- the triac 2 is controlled by a circuit 10 according to the invention which, as before, is connected in parallel with the triac 2, that is to say between the terminal El and the node B constituting the midpoint of the association in series of the load 1 with the triac 2.
- the circuit 10 has an output connected to the trigger g of the triac 2.
- the circuit 10 of the invention is suitable for controlling the triac 2 by phase angle like a conventional circuit as shown in FIG. 1.
- the trigger g of the triac 2 (or the control terminal of an analogous component) is connected to a first terminal of a diac 4 (or any other component with bidirectional conduction triggered automatically when the voltage across its terminals exceeds a predetermined threshold), of which a second terminal A is connected to the midpoint of a series association of a resistive element R with a capacitive element 11.
- a characteristic of the embodiment of FIG. 4 is that the resistive element R consists of a fixed resistance of high value.
- Another characteristic of this embodiment is that the capacitive element 11, connected between the nodes A and B, is made variable.
- the capacitive element 11 is made variable.
- a first advantage of the present invention will now be noted, which is that the only capacitive or resistive high voltage component of the circuit is now the resistive element connecting the terminals El and A.
- the invention then already provides an improvement over the conventional circuit of Figure 1, even for operation in steady state, which is to avoid the use of a high voltage potentiometer (P, Figure 1).
- a first solution for producing a variable capacitive element would be to use a variable capacitor.
- such a component is particularly expensive especially since it must be bidirectional.
- the use of a simple variable capacitor would not make it possible to solve another objective of the present invention which is to limit the inrush current during transient modes of ignition of the circuit.
- a feature of the present invention is to provide, in parallel on the diac 4 or the like, a capacitor C1 in series with a circuit functionally constituting a variable "voltage source” taking a value fixed in steady state.
- FIG. 5 represents the equivalent diagram of a control circuit according to the invention in steady state.
- the representation of FIG. 5 is schematic and approximate in the sense that the source 12, setting in steady state a voltage V0 as a function of the power desired for the load, is bidirectional.
- This "voltage source” is, according to the invention, produced by means of a capacitor C2 (FIG. 4) mounted in parallel with, preferably, a potentiometer P 'between two terminals 13, 14 of rectified output of a bridge of diodes D1, D2, D3 and D4 connected in series with the capacitor Cl (that is to say whose two terminals 15, 16 of alternative input are connected between the capacitor Cl and the node B).
- the capacitor C2 is of high value compared to the capacitor C1 for, in steady state, maintaining a substantially constant voltage, at least over the duration of an alternation.
- the capacitor C2 applies an offset voltage V0 to the capacitor Cl which is approximately constant over the duration of an alternation of the supply. alternative.
- the role of the diodes D1, D2, D3, D4 is to make the operation bidirectional.
- the role of the potentiometer P 'of this embodiment is to modify the value of the offset voltage. Thanks to the use of capacitor C2, this offset voltage is made progressive, as will be seen later, during changes in the power supply of the load.
- FIG. 6 illustrates, in the form of chronographs, an example of the shape of the voltages Vac, V C1 and V Q at the terminals of the capacitors Cl and C2, and of the current I taken from the AC supply.
- the chronographs in FIG. 6 represent four successive phases of operation.
- a first phase Tl corresponds to a phase of starting or energizing the load.
- a second phase NI corresponds to a first phase of steady state for a first operating power of the load.
- a third phase T2 corresponds to a transient phase of change of speed of the load, that is to say of modification of the power supply of the load by modification of the angle of phase of closing of the triac 2.
- a fourth phase N2 corresponds to a second example of regime established at the end of the change in power of the previous phase. Note that, in the timing diagrams of Figure 6, the time scale is different in the different phases.
- the reference corresponds to the AC supply voltage Vac which is it of fixed period T.
- phase T1 the voltage V C2 being initially zero, the time required to charge the capacitor C1 to the value Vd-V C2 , where Vd represents the threshold voltage of the diac 4, is large.
- the capacitor Cl does not have time to reach the threshold necessary for triggering the diac 4, therefore of the triac 2.
- the capacitor C2 then charges progressively, which has the effect of decreasing progress- the time necessary for the capacitor C1 to reach the threshold voltage Vd-V C2 .
- the voltage V C2 gradually increases until reaching the value VO chosen for the established regime.
- the phase angle gradually decreases until reaching the phase angle chosen for the established regime. As the phase angle is very large at the start, there is no peak current upon ignition, even when the impedance of the load is low.
- the current I gradually increases over several alternations until it reaches the nominal current. For example, for a lamp, this progressive growth makes it possible to gradually heat the filament.
- the capacitor Cl is charged (instant tl).
- the voltage v cl reaches, in absolute value, the threshold voltage Vd of the diac 4, reduced by the voltage VO or VO 'preloaded in the capacitor C2
- the triac 2 enters into conduction (instant t2) and the current I in the load 1 (therefore taken from the sector) increases to the top of the alternation (instant t3).
- the current I decreases with the alternation until it vanishes at the zero crossing of the alternation (instant t4), where the triac 2 is blocked by disappearance of the current which crosses it.
- the capacitor Cl remains charged at the value vd-VO or - (Vd-V0) until the next alternation, and the same operation is repeated, the capacitor Cl being charged from the value Vd-V0 to a value - (Vd-V0) or vice versa.
- the invention provides for a series charge of the capacitors. Cl and C2 (the capacitor Cl being charged through the capacitor C2) at the reversing voltage of the diac 4.
- a modification of the value VO in VO 'leads to a modification of the power in the load As illustrated in FIG. 6 between the phases NI and N2, a modification of the value VO in VO 'leads to a modification of the power in the load.
- the value VO ' is lower in the phase N2 compared to the value VO in the phase NI.
- the capacitor Cl is, at each half-wave, preloaded to a value Vd-V0 ', - (Vd-V0') which, in absolute value, is higher in phase N2 compared to its level of preload in the NI phase. Consequently, the capacitor Cl takes longer to reach the level necessary for the reversal of the diac 4, therefore for the conduction of the triac (instant t'2). It follows that the period t3-t'2 separating the apex of the alternation of the conduction of the triac is shorter, therefore the power delivered is less.
- C ⁇ S (d) 1 - 4 ⁇ VdClR / (4Rp'Cl + T) VM, where VM represents the peak voltage of the AC power supply Vac and where Rp 'represents the resistance of potentiometer P' (and its possible heel resistance).
- the element resistive connecting terminals El and A is a potentiometer and the potentiometer P '( Figure 4) is replaced by a fixed resistor.
- the operation is deduced from that set out above.
- the potentiometer is however a high voltage potentiometer then that the potentiometer P 'of the preferred embodiment of FIG. 4 sees only a low voltage, for example, less than 50 volts.
- the value of the capacitor C2 does not intervene as a first approximation, the latter essentially conditioning the duration of the transient phases.
- phase T2 The change in speed (power) is illustrated by phase T2 in which it is assumed that at an instant t6, the value of the potentiometer P 1 is modified to lead to a modification of the value charged in the capacitor C2 from the value V0 to a lower value V0 '.
- phase Tl the capacitor C2 switches several times to reach this new value (V0 '). It follows that this change in speed takes place without a current peak harmful to the life of the load.
- An advantage of the present invention is that it combines a good limitation of the current draw at startup or at change of speed while allowing a variation in power of the load by means of a variation of a resistive element.
- Limiting successive current peaks in transient conditions limits disturbances in the sector and eliminates flickering or flickering of other possible loads.
- another advantage of the present invention is that it does not require any regulated low voltage power supply as in the classic case of FIG. 3 to power an integrated circuit.
- Another advantage of the invention is that it minimizes the number of components required. In particular, it does not does not require a tension limiting element in the diagonal of the bridge, unlike document US-A-4680536.
- This advantage is linked to the fact that, according to the invention, the voltage source element is in series with the resistive element R and the capacitor Cl whereas, according to the above-mentioned document, the bridge is in parallel with the capacitor C ( Figure 1).
- potentiometer P ' (or the fixed resistor replacing it) also serves to discharge the capacitor C2 to allow a rapid reset of the circuit when the supply is cut off. This condition is necessary so that the capacitor C2 can play its damping role at the next ignition.
- a first terrps constant linked to the starting of the circuit is fixed essentially by the respective values of the resistance R and of the capacitor C2.
- This constant of terrps must be as constant as possible even if the phase angle, that is to say the voltage V C2, is varied. Consequently, it is sought that it depends little on the value of the potentiometer P '.
- a high resistance R will be chosen to limit the dissipation of the circuit. Indeed, this resistance R sees the high voltage of the sector.
- the first time constant is fixed, depending on the load, to avoid harmful overcurrents.
- a second terrps constant essentially fixed by the values of the potentiometer P 'and of the capacitor C2, conditions the duration of extinction, that is to say of reinitialization of the circuit.
- this constant of the shortest possible time, so that the circuit fulfills its role even in the event of close successive ignitions.
- the capacitor C1 must be bidirectional. However, a low voltage capacitor is sufficient. Preferably, a value less than 10 ⁇ F will be chosen for reasons of cost and size. It will also be noted that the capacitor C2, the value of which is greater (several hundred ⁇ F), could be a chemical capacitor (unidirectional).
- the voltage seen by the capacitors C1 and C2 is individually lower than the reversing voltage of the diac 4. Indeed, it is the association in series C1 + C2 which is, according to the invention, charged to the reversal voltage of the diac.
- the peak voltage across the terminals of the capacitor C1 is greater than the voltage across the capacitors C2 which can therefore be of lower voltage.
- P 1 25 k ⁇ variable, with heel resistance of 820 ⁇ .
- a motor of the vacuum cleaner motor type and for a mains supply of 220 volts / 50 Hz, a starting phase duration Tl of the order of 2 seconds, a correct behavior at successive switching on and off, and a progressive power adjustment by varying the phase angle d from 2 ms to 10 ms.
- the present invention is susceptible of various variants and modifications which will appear to those skilled in the art.
- the dimensioning of the various components of the invention is within the reach of those skilled in the art, provided that they comply with the functional indications given above.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Power Conversion In General (AREA)
- Control Of Electrical Variables (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99969889A EP1120019B1 (fr) | 1998-09-29 | 1999-09-29 | Circuit de commande d'une charge a alimenter par une tension alternative |
US09/787,785 US6573674B1 (en) | 1998-09-29 | 1999-09-29 | Circuit for controlling a load to be supplied by an alternating current voltage |
DE69902477T DE69902477D1 (de) | 1998-09-29 | 1999-09-29 | Steuerschaltung für eine wechselspannungsgespeiste last |
JP2000573133A JP2002527025A (ja) | 1998-09-29 | 1999-09-29 | Ac電圧が給電される負荷の制御回路 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9812395A FR2783981B1 (fr) | 1998-09-29 | 1998-09-29 | Circuit de commande d'une charge a alimenter par une tension alternative |
FR98/12395 | 1998-09-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000019778A1 true WO2000019778A1 (fr) | 2000-04-06 |
Family
ID=9531158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1999/002317 WO2000019778A1 (fr) | 1998-09-29 | 1999-09-29 | Circuit de commande d'une charge a alimenter par une tension alternative |
Country Status (6)
Country | Link |
---|---|
US (1) | US6573674B1 (fr) |
EP (1) | EP1120019B1 (fr) |
JP (1) | JP2002527025A (fr) |
DE (1) | DE69902477D1 (fr) |
FR (1) | FR2783981B1 (fr) |
WO (1) | WO2000019778A1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7164238B2 (en) * | 2001-11-14 | 2007-01-16 | Astral Communications, Inc. | Energy savings device and method for a resistive and/or an inductive load and/or a capacitive load |
FR2849551A1 (fr) * | 2002-12-27 | 2004-07-02 | St Microelectronics Sa | Alimentation basse tension isolee |
WO2006092040A1 (fr) * | 2005-03-03 | 2006-09-08 | Tir Systems Ltd. | Procede et appareil de commande de contrainte thermique dans des dispositifs electroluminescents |
KR101573388B1 (ko) * | 2013-10-23 | 2015-12-04 | 한국과학기술원 | Triac 제어를 이용한 엘이디 조명 장치 |
US10398004B1 (en) * | 2018-07-06 | 2019-08-27 | Elb Electronics, Inc. | LED fluorescent lamp emulator circuitry |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2249477A1 (en) * | 1973-10-26 | 1975-05-23 | Fisons Ltd | Electronic 'kick-start' circuit for A.C. loads - is used to enable loads to be driven with low-power setting |
US4107584A (en) * | 1976-05-18 | 1978-08-15 | Aciers Et Outillage Peugeot | Current limiting device for an a.c. motor |
US4680536A (en) * | 1983-02-17 | 1987-07-14 | Prescolite, Inc. | Dimmer circuit with input voltage compensated soft start circuit |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3742337A (en) * | 1972-03-13 | 1973-06-26 | Rca Corp | Protective switching circuit for providing power to a load from an alternating current source having peak to peak excursions within or above a given range |
US3761789A (en) * | 1972-04-17 | 1973-09-25 | L Krafft | Tool carrier and speed control therefor |
FR2352434A1 (fr) * | 1976-05-18 | 1977-12-16 | Peugeot Aciers Et Outillage | Variateur de vitesse pour moteur electrique universel |
US4422030A (en) * | 1980-08-15 | 1983-12-20 | Mcallise Raymond J | A.C. Motor control |
US4350944A (en) * | 1980-10-24 | 1982-09-21 | Power Controls Corporation | Variable control circuit having a timed bypass |
-
1998
- 1998-09-29 FR FR9812395A patent/FR2783981B1/fr not_active Expired - Fee Related
-
1999
- 1999-09-29 DE DE69902477T patent/DE69902477D1/de not_active Expired - Lifetime
- 1999-09-29 JP JP2000573133A patent/JP2002527025A/ja not_active Withdrawn
- 1999-09-29 WO PCT/FR1999/002317 patent/WO2000019778A1/fr active IP Right Grant
- 1999-09-29 US US09/787,785 patent/US6573674B1/en not_active Expired - Lifetime
- 1999-09-29 EP EP99969889A patent/EP1120019B1/fr not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2249477A1 (en) * | 1973-10-26 | 1975-05-23 | Fisons Ltd | Electronic 'kick-start' circuit for A.C. loads - is used to enable loads to be driven with low-power setting |
US4107584A (en) * | 1976-05-18 | 1978-08-15 | Aciers Et Outillage Peugeot | Current limiting device for an a.c. motor |
US4680536A (en) * | 1983-02-17 | 1987-07-14 | Prescolite, Inc. | Dimmer circuit with input voltage compensated soft start circuit |
Also Published As
Publication number | Publication date |
---|---|
FR2783981B1 (fr) | 2000-12-08 |
FR2783981A1 (fr) | 2000-03-31 |
US6573674B1 (en) | 2003-06-03 |
DE69902477D1 (de) | 2002-09-12 |
EP1120019A1 (fr) | 2001-08-01 |
EP1120019B1 (fr) | 2002-08-07 |
JP2002527025A (ja) | 2002-08-20 |
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