CA2495606C - Device for controlling power by phase control, and method for reducing harmonic waves - Google Patents
Device for controlling power by phase control, and method for reducing harmonic waves Download PDFInfo
- Publication number
- CA2495606C CA2495606C CA2495606A CA2495606A CA2495606C CA 2495606 C CA2495606 C CA 2495606C CA 2495606 A CA2495606 A CA 2495606A CA 2495606 A CA2495606 A CA 2495606A CA 2495606 C CA2495606 C CA 2495606C
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- CA
- Canada
- Prior art keywords
- switching element
- control
- phase control
- triac
- consumer
- 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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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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0029—Circuits or arrangements for limiting the slope of switching signals, e.g. slew rate
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Power Conversion In General (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention relates to a device for controlling power by phase control of an alternating voltage supplying an electric consumer (14) and for reducing harmonic waves resulting from the phase control, particularly up to a range of 4 kHz, preferably in the range of the third harmonic wave. Said device comprises a first circuit element (12) (TRIAC), which is connected in series to the consumer (14) and which is controlled by a control device (20) in order to execute a phase control. The device is characterized in that a second circuit element (34) is connected in series to a resistor element (32), whereby the series connection is situated parallel to the first circuit element (12). The control device (20) is configured in such a manner that it controls the second circuit element (34) shortly before the first circuit element (12) and, for a short duration, switches it into the conducting state.
The invention also relates to a method for reducing harmonic waves in the range of up to 4 kHz, preferably the third harmonic wave, during a power control involving phase-control.
The invention also relates to a method for reducing harmonic waves in the range of up to 4 kHz, preferably the third harmonic wave, during a power control involving phase-control.
Description
DEVICE FOR CONTROLLING POWER BY PHASE CONTROL, AND
METHOD FOR REDUCING HARMONIC WAVES
The present invention relates to an apparatus for controlling the power of an AC voltage supplying an electrical consumer by phase control and for reducing harmonics caused by said phase control, particularly within a range of 4 kHz, preferably within a range of the third harmonic, comprising a first switching element connected in series with said consumer and driven by a control device for performing phase control. The invention further relates to a method for reducing harmonics in the range of 4 kHz, preferably in the range of the third har-monic, in a power control performing a phase control.
An apparatus and a method for power control by means of phase control and phase adjustment, respectively, is for example known from the application DE 198 50 905 Al of the present applicant. Devices for phase control serve to control the power supplied to an electric consumer by periodically switching the consumer on and off by means of a switching element. Typically, a TRIAC is used as the switching element, which is connected in series with the consumer and which is fired via a control unit.
METHOD FOR REDUCING HARMONIC WAVES
The present invention relates to an apparatus for controlling the power of an AC voltage supplying an electrical consumer by phase control and for reducing harmonics caused by said phase control, particularly within a range of 4 kHz, preferably within a range of the third harmonic, comprising a first switching element connected in series with said consumer and driven by a control device for performing phase control. The invention further relates to a method for reducing harmonics in the range of 4 kHz, preferably in the range of the third har-monic, in a power control performing a phase control.
An apparatus and a method for power control by means of phase control and phase adjustment, respectively, is for example known from the application DE 198 50 905 Al of the present applicant. Devices for phase control serve to control the power supplied to an electric consumer by periodically switching the consumer on and off by means of a switching element. Typically, a TRIAC is used as the switching element, which is connected in series with the consumer and which is fired via a control unit.
2 The control unit comprises a series connection of a resistor and a firing capacitor, the series connection being provided parallel to the TRIAC (Triode for Alternating Current). The firing signal is tapped off between the resistor and the firing capacitor and is supplied to the control input (gate) of the TRIAC via a series connection of a resistor and a firing element in form of a DIAC. Beside these analogue designed control devices, also integrated circuits are nowadays available which perform this driving function.
The power control via phase control of the AC voltage supplied to the consumer causes undesired harmonics, and there are Euro-pean standards regulating the level of such harmonics. These standards have to be fulfilled by the power control apparatuses which is the reason why approaches for reducing these harmonics have been proposed in the past.
When reducing the harmonics, particularly the third harmonic plays a special role, therefore, former approaches have concen-trated to reduce the third harmonic. An example of an apparatus for reducing the third harmonic is for example disclosed in EP 0 859 452 B1 of the present applicant. In the solution dis-closed therein, the phase angle and firing angle, respectively, is changed by the control device around a predetermined value in succeeding full waves. Such an asymmetry in the firing angle results in only slowly increasing even numbered harmonics and highly reduced odd numbered harmonics.
Although this approach proved successful in practise and al-lows, to meet the existing standards readily, of course it further exists the request for finding a solution even less expensive. Moreover an apparatus would be desirable, the hum of which is slightly reduced in the range of 25 Hz compared to the -~:Laratus shown in the mentioned document.
The power control via phase control of the AC voltage supplied to the consumer causes undesired harmonics, and there are Euro-pean standards regulating the level of such harmonics. These standards have to be fulfilled by the power control apparatuses which is the reason why approaches for reducing these harmonics have been proposed in the past.
When reducing the harmonics, particularly the third harmonic plays a special role, therefore, former approaches have concen-trated to reduce the third harmonic. An example of an apparatus for reducing the third harmonic is for example disclosed in EP 0 859 452 B1 of the present applicant. In the solution dis-closed therein, the phase angle and firing angle, respectively, is changed by the control device around a predetermined value in succeeding full waves. Such an asymmetry in the firing angle results in only slowly increasing even numbered harmonics and highly reduced odd numbered harmonics.
Although this approach proved successful in practise and al-lows, to meet the existing standards readily, of course it further exists the request for finding a solution even less expensive. Moreover an apparatus would be desirable, the hum of which is slightly reduced in the range of 25 Hz compared to the -~:Laratus shown in the mentioned document.
3 In view of the above it is an object of the present invention to provide an apparatus for power control by phase control, which may be manufactured at a reasonable price and which has an improved hum performance.
According to the present invention, there is provided an apparatus for controlling the power of an AC voltage supplying an electrical consumer by phase control and for reducing harmonics caused by said phase control, particularly within a range of the third harmonic, comprising a first switching element connected in series with said consumer and driven by a control device for performing a phase control, characterized in that a second switching element connected in series with a resistor element is provided, a series connection of said second switching element and said resistor element is provided electrically parallel to the first switching element, and said control device is adapted to drive the second switching element shortly before the first switching element and switches the second switching element in a conducting state for a short time period.
That is in other words that caused by prior switching the sec-ond switching element into the conducting state, a current flows which is taken over by the first switching element after its firing. Caused by the resistor element, the current passing through the second switching element is less than the current passing through the first switching element. Altogether, by means of the second switching element a softer increase of the current in total may be achieved so that the harmonics caused thereby are reduced. Particularly, switching the second switch-ing element on generates harmonics which partially extinguish harmonics occurring upon firing the second switching element.
Due to the few additional components which are necessary for the apparatus for power control according to the present inven-tion, manufacturing costs may be saved, however, without dete-
According to the present invention, there is provided an apparatus for controlling the power of an AC voltage supplying an electrical consumer by phase control and for reducing harmonics caused by said phase control, particularly within a range of the third harmonic, comprising a first switching element connected in series with said consumer and driven by a control device for performing a phase control, characterized in that a second switching element connected in series with a resistor element is provided, a series connection of said second switching element and said resistor element is provided electrically parallel to the first switching element, and said control device is adapted to drive the second switching element shortly before the first switching element and switches the second switching element in a conducting state for a short time period.
That is in other words that caused by prior switching the sec-ond switching element into the conducting state, a current flows which is taken over by the first switching element after its firing. Caused by the resistor element, the current passing through the second switching element is less than the current passing through the first switching element. Altogether, by means of the second switching element a softer increase of the current in total may be achieved so that the harmonics caused thereby are reduced. Particularly, switching the second switch-ing element on generates harmonics which partially extinguish harmonics occurring upon firing the second switching element.
Due to the few additional components which are necessary for the apparatus for power control according to the present inven-tion, manufacturing costs may be saved, however, without dete-
4 riorating the quality with respect to the reduction of harmon-ics.
Generally, the present invention is based on the idea to have an amount of current flow before the actual firing procedure and the switching on of the TRIAC, the amount of current being smaller than the real current flowing through the first switch-ing element. Due to that, as mentioned before, further harmon-ics are generated previously which harmonics partially extin-guish harmonics caused during the real phase control.
Preferably, a TRIAC is used as a switching element. It is fur-ther preferred that the resistor element is provided as a sim-ple ohmic resistor. Of course other resistor elements may also be used, for example inductive or capacitive resistors. How-ever, it has been proven that ohmic resistors are suitable well with respect to their dimensions and costs.
The object underlying the present invention is also solved by a method for reducing harmonics in the range of 4 kHz, preferably the third harmonic, in a power control performing a phase con-trol, wherein the method comprising the steps:
- driving a first switching element on the basis of a first predetermined firing angle, as to perform a phase control method;
- shortly switching a connection into a conducting state before firing the first switching element, said connection having a resistance and bridging said first switching element.
As described before, a TRIAC is used as the switchable connec-tion having a resistance which is connected in series with an ohmic resistor parallel to the first switching element.
It is to be understood that the features mentioned above and those yet to be explained below can be used not only in the respective combinations indicated but also in other combina-tions or in isolation, without leaving the scope of the present invention.
The invention will now be described in detail on the basis of an embodiment with reference to the drawing. In the drawings:
Fig. 1 shows a schematic block diagram of an apparatus for power control according to the present invention, and Fig. 2 shows a diagram for illustrating the voltage- and current time curves.
In Fig. 1, an apparatus for power control is shown and indi-cated with reference numeral 10. The power control is performed by a phase control method which is generally known and has not to be described again here.
For performing the phase control, the apparatus 10 comprises a TRIAC 12 which is connected in series with the consumer 14 to be controlled. The series connection of TRIAC 12 and consumer 14 is supplied by an AC voltage supply U,,atZ, wherein both elec-tric poles are indicated with L and N.
In the present embodiment the consumer 14 is provided as a motor 15 which represents an inductive load.
The TRIAC 12 is connected with a control unit 20 via its con-trol input (gate) 16), which control unit 20 generates respec-tive firing pulses corresponding to the desired power and sup-plies these pulses to the control terminal 16.
This control device 20 may either be provided as a discrete circuit, comprising for example a firing capacitor for generat-ing the firing pulses. Of course, the control device may also be provided as an integrated circuit.
The firing pulses causes the TRIAC 12 to switch in a conducting state so that the consumer 14 may be supplied with power. The TRIAC 12 remains conductive until the end of the half wave of the supply voltage and switches then in the non-conductive state. By a respective selection of the firing time within a half wave of the supply voltage it is possible to control the power.
With this kind of power control harmonics are generated acting back into the AC voltage supply network. Due to European stan-dards these harmonics may not exceed predetermined values. It is therefore necessary to take measures for reducing these harmonics.
In the apparatus 10, a switching unit 30 is therefore provided.
This switching unit 30 has the task to cause an amount of cur-rent to be passed through the consumer 14 before the real fir-ing time instant, which amount of current is less than the real nominal current. In Fig. 2, this amount of current is indicated with reference numeral 41. It is clearly shown that this amount of current 41 starts flowing before the real flowing current after firing the TRIAC which is indicated with reference nu-meral 43. The time difference between the instant tl of the smaller amount of current 41 and the instant t2 of the nominal current 43 is about 1-2 ms and may be varied dependent on the firing angle. Particularly, the difference may be set to zero with very small and/or with very high firing angles having the result that the switching unit 30 remains ineffective.
By means of a small amount of current 41 flowing before the real nominal current 43, a total current passing through the consumer 14 is generated, which rise is significantly flatted.
This flattening has the effect that the generation of harmonics is reduced, particularly by destructive interference of the harmonics which are assigned to the amount of current 41 and the nominal current 43.
Altogether, this type of control is able to reduce the lower harmonics and particularly the third harmonic here.
The function of the switching unit 30 is achieved in the pre-sent embodiment by a series connection of a resistor 32 and a TRIAC 34, which series connection is arranged parallel to the TRIAC 12. Hence, a current path between a terminal of the sup-ply voltage via the consumer 14, the resistor 32 and the TRIAC
34 to the second terminal N is formed when the TRIAC 34 is in the conducting state. In this case, the TRIAC 12 is bypassed.
The TRIAC 34 is driven also by the control unit 20, which sup-plies firing pulses to the control input 36 (gate) of the TRIAC
34. As mentioned before, this firing pulse is generated at the instant ti, which lies before the instant t2 of the real firing pulse supplied to the TRIAC 12. The respective difference t2 - t1 may be a fixed value or may be adjusted by the control unit 20 dependent on the firing angle of the firing pulses to the TRIAC 12.
The resistor 32 provided in the switching unit 30 is preferably an ohmic resistor and serves to keep the current 41 below the amount of the nominal current 43. A resistor having a resis-tance in the range of for example 10 Ohm has been proven as particularly suitable. However, it is to be noted that the limitation of the current 41 may be achieved differently and with different components.
As already mentioned before, the TRIAC 12 is bypassed shortly before its firing through the switching unit 30, so that a current may pass through the consumer 14. This procedure is periodically repeated every half wave of the supply voltage.
It has been shown that a reduction of harmonics is possible with a very simple and cost effective switching unit 30 so that the existing standards may be met. Furthermore, it has been shown that the humming noise which occurs with prior switching units for reducing harmonics, may be substantially reduced.
Generally, the present invention is based on the idea to have an amount of current flow before the actual firing procedure and the switching on of the TRIAC, the amount of current being smaller than the real current flowing through the first switch-ing element. Due to that, as mentioned before, further harmon-ics are generated previously which harmonics partially extin-guish harmonics caused during the real phase control.
Preferably, a TRIAC is used as a switching element. It is fur-ther preferred that the resistor element is provided as a sim-ple ohmic resistor. Of course other resistor elements may also be used, for example inductive or capacitive resistors. How-ever, it has been proven that ohmic resistors are suitable well with respect to their dimensions and costs.
The object underlying the present invention is also solved by a method for reducing harmonics in the range of 4 kHz, preferably the third harmonic, in a power control performing a phase con-trol, wherein the method comprising the steps:
- driving a first switching element on the basis of a first predetermined firing angle, as to perform a phase control method;
- shortly switching a connection into a conducting state before firing the first switching element, said connection having a resistance and bridging said first switching element.
As described before, a TRIAC is used as the switchable connec-tion having a resistance which is connected in series with an ohmic resistor parallel to the first switching element.
It is to be understood that the features mentioned above and those yet to be explained below can be used not only in the respective combinations indicated but also in other combina-tions or in isolation, without leaving the scope of the present invention.
The invention will now be described in detail on the basis of an embodiment with reference to the drawing. In the drawings:
Fig. 1 shows a schematic block diagram of an apparatus for power control according to the present invention, and Fig. 2 shows a diagram for illustrating the voltage- and current time curves.
In Fig. 1, an apparatus for power control is shown and indi-cated with reference numeral 10. The power control is performed by a phase control method which is generally known and has not to be described again here.
For performing the phase control, the apparatus 10 comprises a TRIAC 12 which is connected in series with the consumer 14 to be controlled. The series connection of TRIAC 12 and consumer 14 is supplied by an AC voltage supply U,,atZ, wherein both elec-tric poles are indicated with L and N.
In the present embodiment the consumer 14 is provided as a motor 15 which represents an inductive load.
The TRIAC 12 is connected with a control unit 20 via its con-trol input (gate) 16), which control unit 20 generates respec-tive firing pulses corresponding to the desired power and sup-plies these pulses to the control terminal 16.
This control device 20 may either be provided as a discrete circuit, comprising for example a firing capacitor for generat-ing the firing pulses. Of course, the control device may also be provided as an integrated circuit.
The firing pulses causes the TRIAC 12 to switch in a conducting state so that the consumer 14 may be supplied with power. The TRIAC 12 remains conductive until the end of the half wave of the supply voltage and switches then in the non-conductive state. By a respective selection of the firing time within a half wave of the supply voltage it is possible to control the power.
With this kind of power control harmonics are generated acting back into the AC voltage supply network. Due to European stan-dards these harmonics may not exceed predetermined values. It is therefore necessary to take measures for reducing these harmonics.
In the apparatus 10, a switching unit 30 is therefore provided.
This switching unit 30 has the task to cause an amount of cur-rent to be passed through the consumer 14 before the real fir-ing time instant, which amount of current is less than the real nominal current. In Fig. 2, this amount of current is indicated with reference numeral 41. It is clearly shown that this amount of current 41 starts flowing before the real flowing current after firing the TRIAC which is indicated with reference nu-meral 43. The time difference between the instant tl of the smaller amount of current 41 and the instant t2 of the nominal current 43 is about 1-2 ms and may be varied dependent on the firing angle. Particularly, the difference may be set to zero with very small and/or with very high firing angles having the result that the switching unit 30 remains ineffective.
By means of a small amount of current 41 flowing before the real nominal current 43, a total current passing through the consumer 14 is generated, which rise is significantly flatted.
This flattening has the effect that the generation of harmonics is reduced, particularly by destructive interference of the harmonics which are assigned to the amount of current 41 and the nominal current 43.
Altogether, this type of control is able to reduce the lower harmonics and particularly the third harmonic here.
The function of the switching unit 30 is achieved in the pre-sent embodiment by a series connection of a resistor 32 and a TRIAC 34, which series connection is arranged parallel to the TRIAC 12. Hence, a current path between a terminal of the sup-ply voltage via the consumer 14, the resistor 32 and the TRIAC
34 to the second terminal N is formed when the TRIAC 34 is in the conducting state. In this case, the TRIAC 12 is bypassed.
The TRIAC 34 is driven also by the control unit 20, which sup-plies firing pulses to the control input 36 (gate) of the TRIAC
34. As mentioned before, this firing pulse is generated at the instant ti, which lies before the instant t2 of the real firing pulse supplied to the TRIAC 12. The respective difference t2 - t1 may be a fixed value or may be adjusted by the control unit 20 dependent on the firing angle of the firing pulses to the TRIAC 12.
The resistor 32 provided in the switching unit 30 is preferably an ohmic resistor and serves to keep the current 41 below the amount of the nominal current 43. A resistor having a resis-tance in the range of for example 10 Ohm has been proven as particularly suitable. However, it is to be noted that the limitation of the current 41 may be achieved differently and with different components.
As already mentioned before, the TRIAC 12 is bypassed shortly before its firing through the switching unit 30, so that a current may pass through the consumer 14. This procedure is periodically repeated every half wave of the supply voltage.
It has been shown that a reduction of harmonics is possible with a very simple and cost effective switching unit 30 so that the existing standards may be met. Furthermore, it has been shown that the humming noise which occurs with prior switching units for reducing harmonics, may be substantially reduced.
Claims (4)
1. Apparatus for controlling the power of an AC voltage supplying an electrical consumer (14) by phase control and for reducing harmonics caused by said phase control, comprising a first switching element (12) connected in series with said consumer (14) and driven by a control device (20) for performing a phase control, characterized in that a second switching element (34) connected in series with a resistor element (32) is provided, a series connection of said second switching element (34) and said resistor element (32) is provided electrically parallel to the first switching element (12), and said control device (20) is adapted to drive the second switching element (34) before the first switching element (12) and switches the second switching element (34) in a conducting state for a time period.
2. Apparatus according to claim 1, characterized in that the harmonics are within a range of the third harmonic.
3. Apparatus according to claim 1 or 2, characterized in that the second switching element (34) is a TRIAC (Triode for Alternating Current).
4. Apparatus according to any one of claims 1 to 3, characterized in that the resistor element (32) is an ohmic resistor.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10237983A DE10237983A1 (en) | 2002-08-14 | 2002-08-14 | Phase gating power control device and harmonic reduction method |
| DE10237983.1 | 2002-08-14 | ||
| PCT/EP2003/008966 WO2004017504A1 (en) | 2002-08-14 | 2003-08-13 | Device for controlling power by phase control, and method for reducing harmonic waves |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2495606A1 CA2495606A1 (en) | 2004-02-26 |
| CA2495606C true CA2495606C (en) | 2010-03-16 |
Family
ID=31197106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2495606A Expired - Fee Related CA2495606C (en) | 2002-08-14 | 2003-08-13 | Device for controlling power by phase control, and method for reducing harmonic waves |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1529335B1 (en) |
| KR (1) | KR100696978B1 (en) |
| CN (1) | CN100449917C (en) |
| AU (1) | AU2003260408B2 (en) |
| CA (1) | CA2495606C (en) |
| DE (2) | DE10237983A1 (en) |
| WO (1) | WO2004017504A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7342372B2 (en) | 2005-10-05 | 2008-03-11 | Aktiebolaget Electrolux | Method for power control of an electric motor |
| WO2008098303A1 (en) * | 2007-02-16 | 2008-08-21 | Aldridge Traffic Controllers Pty Ltd | Induced voltage suppressor for use in a traffic signal controller |
| DE102007059789B3 (en) * | 2007-12-11 | 2009-06-10 | Panasonic Electronic Devices Europe Gmbh | Harmonic and inter harmonic waves reducing method for power control of electrical load attached at alternating voltage network by leading edge, involves averaging ignition angle on sequence corresponding to preset value of ignition angle |
| DE102011079053A1 (en) | 2011-07-13 | 2013-01-17 | Singulus Technologies Ag | Method for operating electric loads in alternating current (AC) network, involves driving positive half-waves for one electric load and negative half-waves for another electric load with phase angle in one operating mode |
| US20140217818A1 (en) | 2011-07-13 | 2014-08-07 | Singulus Technologies Ag | Method for operating several loads in alternating current networks with leading edge or trailing edge phase cutting |
| WO2017188489A1 (en) * | 2016-04-26 | 2017-11-02 | 주식회사 모스트파워 | Device for removing inductive kickback voltage for phase-off control |
| US10537199B2 (en) * | 2016-07-01 | 2020-01-21 | Weber-Stephen Products Llc | Digital power supply |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4305882A1 (en) * | 1993-02-26 | 1994-09-01 | Stiebel Eltron Gmbh & Co Kg | Protective circuit for a semiconductor switch, particularly a triac |
| JPH0968898A (en) * | 1995-08-31 | 1997-03-11 | Minolta Co Ltd | Heater controlling device |
| DE19904615A1 (en) * | 1999-02-05 | 2000-08-10 | Forbach Gmbh | Electrical or electronic circuit with controlling component for hot water heater, has current limiter that interacts with controlled component or unit to protect controlling component |
-
2002
- 2002-08-14 DE DE10237983A patent/DE10237983A1/en not_active Withdrawn
-
2003
- 2003-08-13 EP EP03787780A patent/EP1529335B1/en not_active Expired - Lifetime
- 2003-08-13 DE DE50308357T patent/DE50308357D1/en not_active Expired - Lifetime
- 2003-08-13 CA CA2495606A patent/CA2495606C/en not_active Expired - Fee Related
- 2003-08-13 CN CNB038194031A patent/CN100449917C/en not_active Expired - Fee Related
- 2003-08-13 KR KR1020057002480A patent/KR100696978B1/en not_active IP Right Cessation
- 2003-08-13 AU AU2003260408A patent/AU2003260408B2/en not_active Ceased
- 2003-08-13 WO PCT/EP2003/008966 patent/WO2004017504A1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| CN1692543A (en) | 2005-11-02 |
| DE50308357D1 (en) | 2007-11-22 |
| DE10237983A1 (en) | 2004-03-04 |
| AU2003260408B8 (en) | 2004-03-03 |
| EP1529335A1 (en) | 2005-05-11 |
| AU2003260408B2 (en) | 2007-08-16 |
| CN100449917C (en) | 2009-01-07 |
| KR100696978B1 (en) | 2007-03-20 |
| WO2004017504A1 (en) | 2004-02-26 |
| EP1529335B1 (en) | 2007-10-10 |
| AU2003260408A1 (en) | 2004-03-03 |
| CA2495606A1 (en) | 2004-02-26 |
| WO2004017504A8 (en) | 2005-07-28 |
| KR20050043907A (en) | 2005-05-11 |
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