EP0914026A1 - Ohmsche Schaltung für elektronischen Dimmer - Google Patents

Ohmsche Schaltung für elektronischen Dimmer Download PDF

Info

Publication number
EP0914026A1
EP0914026A1 EP98203277A EP98203277A EP0914026A1 EP 0914026 A1 EP0914026 A1 EP 0914026A1 EP 98203277 A EP98203277 A EP 98203277A EP 98203277 A EP98203277 A EP 98203277A EP 0914026 A1 EP0914026 A1 EP 0914026A1
Authority
EP
European Patent Office
Prior art keywords
resistive
circuit
threshold value
circuit according
dimmer 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.)
Withdrawn
Application number
EP98203277A
Other languages
English (en)
French (fr)
Inventor
Freddy Bal
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Niko NV
Original Assignee
Niko NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Niko NV filed Critical Niko NV
Publication of EP0914026A1 publication Critical patent/EP0914026A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • H05B39/04—Controlling
    • H05B39/08—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices

Definitions

  • the present invention concerns a resistive circuit for an electronic dimmer device equipped with a power semiconductor, which circuit contains a resistive load connected to the dimmer device as an auxiliary load or built in in the dimmer device.
  • Such circuits are used in electronic dimmer devices with a power semiconductor to avoid functional problems which might occur in some cases.
  • One of the problems with dimmer devices equipped with a power semiconductor is among others an insufficient holding current in the case of certain load types such as inductive loads, for example motors or wound transformers, loads which are lower than the prescribed load or also electronic chokes with an inductive character such as fluorescent ballasts.
  • load types such as inductive loads, for example motors or wound transformers, loads which are lower than the prescribed load or also electronic chokes with an inductive character such as fluorescent ballasts.
  • the known resistive circuits for resolving the above-mentioned problems contain an either or not external resistance, continuously connected in series with the dimmer.
  • said resistance Due to the heating up, the use of said resistance may entail a fire risk. Moreover, said resistance is applied loosely in some cases, which is not always safe.
  • the present invention aims a resistive circuit for an electronic dimmer device which does not have the above-mentioned and other disadvantages and which avoids problems with an insufficient holding current, whereas the loss of energy and the heat production remain restricted, so that the whole is safe.
  • the circuit contains detection means to detect the moment when the power semiconductor of the dimmer device is connected and switching means to switch on the resistive load for a restricted length of time, for example for 1.5 ms, when said detection means detect that the power semiconductor is connected.
  • the resistive load With such a resistive circuit replacing the above-mentioned continuously connected resistance, the resistive load will not be continuously connected, but only when this is required to maintain the holding current at a sufficiently high level.
  • the circuit may also contain a voltage detector to detect when the input voltage over the circuit is situated beneath a certain threshold value, for example a threshold value between 80 and 120 V, or reaches this threshold value, and switching means to switch on the resistive load when the input voltage of the circuit is situated beneath the above-mentioned threshold value and to keep it switched on at least until the input voltage reaches this threshold value, preferably for a certain length of time, for example 1.5 ms, after said threshold value has been reached, even though the above-mentioned length of time has already elapsed after the detection means have detected that the power semiconductor has been connected.
  • a certain threshold value for example a threshold value between 80 and 120 V, or reaches this threshold value
  • switching means to switch on the resistive load when the input voltage of the circuit is situated beneath the above-mentioned threshold value and to keep it switched on at least until the input voltage reaches this threshold value, preferably for a certain length of time, for example 1.5 ms, after said threshold value has been reached, even though the above-ment
  • the present embodiment also prevents the undesired starting of the oscillator of an electronic transformer by the leakage current, caused by the anti-interference capacitor of the dimmer device, which problem was normally also solved by the above-mentioned known and thus continuously operating resistance with said disadvantages.
  • the switching means onto which the detection means and the voltage detector are connected can be common switching means.
  • the switching means preferably contain a circuit element, for example a transistor, which is connected in series to the resistive load, and a control consisting for example of a monostable multivibrator, onto which the circuit element is connected.
  • a circuit element for example a transistor, which is connected in series to the resistive load
  • a control consisting for example of a monostable multivibrator, onto which the circuit element is connected.
  • the resistive circuit 1 represented in figure 1 is designed to be connected in parallel with a load, as is represented for example in figure 3, to an electronic dimmer device 2 which may be of a known design, with a power semiconductor which may for example be a transistor or a thyristor, in particular a triac.
  • This resistive circuit 1 mainly consists of a resistive load 3 which can be switched on and off by a circuit element 4, of a control of said circuit element 4 consisting of a monostable multivibrator 5 and which is connected to detection means consisting of a differentiator 6 on the one hand, and to a voltage detector 7 on the other hand, and of a direct-current power supply 8 which is connected to a rectifier 9.
  • the rectifier 9 is connected to an alternating-current power supply and is required since the circuit element 4 and thus also the monostable multivibrator 5 operate on direct current.
  • the direct-current power supply 8 provides for the power supply of the monostable multivibrator 5 and the voltage detector 7.
  • the differentiator 6 forms detection means to detect the switching moment of the power semiconductor of the dimmer device 2 and emits a signal on the monostable multivibrator 5 as soon as this is detected.
  • the voltage detector 7 will react when the input voltage of the resistive circuit 1 is situated beneath a certain threshold value P situated between 90 and 110 V and which preferably amounts to 100 V until said threshold value P is reached.
  • the monostable multivibrator 5 forms common switching means to put the circuit element 4 in its switch position, i.e. the position in which the resistive load 3 is switched on, either after the connection of the power semiconductor of the dimmer device 2 has been detected by the differentiator 6, or when the voltage detector 7 detects an input voltage which is situated beneath the above-mentioned threshold value P, and in order to bring the circuit element 4 out of said switch position again, a certain length of time T which in the given example amounts to 1.5 ms, after the connection of the power semiconductor has been detected, unless the voltage detector 7 detects an input voltage situated underneath the above-mentioned threshold value P, or after the voltage detector 7 has detected that the input voltage has reached the threshold value P respectively.
  • the direct-current power supply 8 is connected to the rectifier 9 and feeds the voltage detector 7 and the monostable multivibrator 5.
  • the differentiator 6 As soon as the differentiator 6 detects that the power semiconductor of the dimmer device 2 is connected, it will transmit a signal to the monostable multivibrator 5 which is connected as a result thereof and changes the position of the circuit element 4, such that the resistive load 3 will be connected in parallel with the load onto which the dimmer device 2 is connected for a length of time T, and will also keep it in the switch position during said length of time T to prevent the power semiconductor to be reversed due to a retardation of current or an induced current.
  • the voltage detector 7 detects when the input voltage over the resistive circuit 1 has reached the threshold value P and connects the monostable multivibrator 5 when said input voltage is situated under the threshold value P, as a result of which the latter puts the circuit element 4 in its switch position and the resistive load 3 is connected.
  • the voltage detector 7 will not keep the monostable multivibrator 5 connected any longer when the input voltage has reached the threshold value P, but the monostable multivibrator 5 will retain the circuit element 4 in its switch position for the above-mentioned length of time T.
  • the differentiator 6 and the voltage detector 7 operate simultaneously, which has for a result that, in the case when the length of time T has elapsed after the differentiator 6 has detected that the power semiconductor has started, and the voltage detector 7 detects that the input voltage is still situated beneath the threshold value P, the monostable multivibrator 5 will not bring the circuit element 4 out of its switch position, but it will wait to do so until the length of time T has elapsed after the threshold value P has been reached.
  • the resistive load 3 is only switched on when necessary and it is switched out as soon as it is no longer required, so that the loss over this load 3 is restricted to a minimum.
  • the heating up is restricted to a minimum; and the resistive circuit can even be provided in one and the same housing together with the dimmer device or it can be cast as a whole.
  • Figure 2 represents an electrical circuit diagram of a practical embodiment of the resistive circuit 1.
  • the resistive load 3 is a resistance and the circuit element 4 is a transistor, for example a MOSFET.
  • the rectifier 9 is a conventional rectifier with diodes whose input is connected to an alternating-current source of 230 V and of which one output pole is connected to the mass, whereas the other is connected to a positive direct current of 230 V.
  • the differentiator 6 which is connected between the outputs of the rectifier 9 consists of a series connection with a capacity 10 and two resistances 11 and 12.
  • the voltage detector 7 contains a transistor 13 whose base is connected to a positive pole of the rectifier 9 via a resistance 14, whose emitter is connected to the direct-current power supply 8 and whose collector is connected to the output of the differentiator 6 via a resistance 15 and a diode 16. Further, the voltage detector 7 contains another resistance 17 and a diode 18 between the mass and the direct-current power supply 8.
  • the above-mentioned output of the differentiator 6 is also connected to the base of the transistor 19 which is part of the monostable multivibrator 5. Between this base and the mass is connected a zener diode 20.
  • the emitter of the transistor 19 is connected to the transistor forming the circuit element 4 and it is connected to the mass over a condenser 21 and over a resistance 22.
  • the collector of the transistor 19 is connected to the direct-current power supply 8 via a resistance 23.
  • the direct-current power supply 8 contains two condensers 24 and 25, a resistance 26 which limits the current, a diode 27 which only lets the voltage through in the direction of the monostable multivibrator 5 and the voltage detector 7, and a zener diode 28 which brings the voltage to for example 10 V.
  • FIG. 3 shows how the above-described resistive circuit 1 can be used in practice.
  • This figure represents a circuit with a low-voltage halogen lamp 29 which is fed over a transformer 30 which is connected to a dimmer device 2.
  • the resistive circuit 1 is connected in parallel to the transformer 30 on its primary side.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP98203277A 1997-10-31 1998-09-29 Ohmsche Schaltung für elektronischen Dimmer Withdrawn EP0914026A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9700874 1997-10-31
BE9700874A BE1011524A3 (nl) 1997-10-31 1997-10-31 Resistieve schakeling voor een elektronische diminrichting.

Publications (1)

Publication Number Publication Date
EP0914026A1 true EP0914026A1 (de) 1999-05-06

Family

ID=3890809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98203277A Withdrawn EP0914026A1 (de) 1997-10-31 1998-09-29 Ohmsche Schaltung für elektronischen Dimmer

Country Status (2)

Country Link
EP (1) EP0914026A1 (de)
BE (1) BE1011524A3 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0140851A1 (de) * 1983-09-22 1985-05-08 Kraftelektronik AB Magnetisierungseinrichtung für Transformatoren
GB2228151A (en) * 1989-02-13 1990-08-15 Lutron Electronics Co Quasi-constant gate drive circuit for thyristor
DE4026350A1 (de) * 1990-08-21 1992-02-27 Robo Mechanik R Boriss Gmbh El Phasenanschnitt-steuerschaltung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0140851A1 (de) * 1983-09-22 1985-05-08 Kraftelektronik AB Magnetisierungseinrichtung für Transformatoren
GB2228151A (en) * 1989-02-13 1990-08-15 Lutron Electronics Co Quasi-constant gate drive circuit for thyristor
DE4026350A1 (de) * 1990-08-21 1992-02-27 Robo Mechanik R Boriss Gmbh El Phasenanschnitt-steuerschaltung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"HALOGEN LIGHT DIMMER", ELEKTOR ELECTRONICS, vol. 20, no. 221, 1 April 1994 (1994-04-01), pages 5 - 7, XP000440260 *

Also Published As

Publication number Publication date
BE1011524A3 (nl) 1999-10-05

Similar Documents

Publication Publication Date Title
US6044519A (en) Portable electric tool vacuum cleaner control
US4608500A (en) Electric power unit
US4678985A (en) Two-terminal line-powered control circuit
GB2144001A (en) Power supply circuit
US5532528A (en) Converter including direct current detection
US5589760A (en) Traveller's voltage converter for automatically selecting load wattage
US4945291A (en) Lamp-lighting device
EP0914026A1 (de) Ohmsche Schaltung für elektronischen Dimmer
US4672367A (en) Optical indicator device
EP0061744A2 (de) Transistor-Invertiervorrichtung
AU707310B2 (en) Switch with controlled rise and fall characteristics
US5760498A (en) Power drawing circuit for two-wire switching unit
JPH023277Y2 (de)
US5142431A (en) Output stage for an ac voltage switch
KR920006440Y1 (ko) 전자식 네온 안정기의 무부하시 과출력 방지회로
JPH0370208A (ja) ゼロクロス形無接点スイッチ
KR0114674Y1 (ko) 110v/220v자동절환회로
US4947087A (en) Lamp-lighting device
KR950003027Y1 (ko) 인버터 제동장치
JPH06233528A (ja) スイッチング電源装置
KR970008822B1 (ko) 모터 결선 자동전환기
KR100707398B1 (ko) 저 전압 스타트 회로를 갖는 직류전압용 전자식 안정기
CN111426871A (zh) 过压指示电路、过压指示方法及家用电器
JPH0715307A (ja) ソリッドステートリレー
KR20000004240U (ko) 광 감지를 이용한 스위치

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 19990528

AKX Designation fees paid

Free format text: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20010331