WO2013108331A1 - ２線式調光スイッチ - Google Patents

２線式調光スイッチ Download PDF

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Publication number
WO2013108331A1
WO2013108331A1 PCT/JP2012/007762 JP2012007762W WO2013108331A1 WO 2013108331 A1 WO2013108331 A1 WO 2013108331A1 JP 2012007762 W JP2012007762 W JP 2012007762W WO 2013108331 A1 WO2013108331 A1 WO 2013108331A1
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WO
WIPO (PCT)
Prior art keywords
circuit
switch element
auxiliary
power supply
switch
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PCT/JP2012/007762
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English (en)
French (fr)
Japanese (ja)
Inventor
後藤　潔
工藤　弘行
修次 松浦
平田　聡
麻衣 佐々木
Original Assignee
パナソニック株式会社
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.)
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Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Priority to KR1020147018426A priority Critical patent/KR101626694B1/ko
Priority to CN201280067041.1A priority patent/CN104041188B/zh
Publication of WO2013108331A1 publication Critical patent/WO2013108331A1/ja

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    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • 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
    • H05B39/041—Controlling the light-intensity of the source
    • H05B39/044—Controlling the light-intensity of the source continuously
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

  • the present invention relates to a two-wire dimmer switch for adjusting the brightness of a lighting load.
  • FIG. 8 shows a basic circuit configuration (first conventional example) of the two-wire dimmer switch 50 using the triac 51.
  • the two-wire dimmer switch 50 is connected in series to the AC power source 2 and the illumination load (incandescent light bulb) 3.
  • the two-wire dimming switch 50 is connected to the triac 51, the gate electrode of the triac 51, and for example, a diac (trigger diode) 52 for inputting a gate drive signal, and a variable connected to an operation member operated by a user. It comprises a resistor 53, a fixed resistor 54, a capacitor 55, a filter element 56, and the like.
  • the capacitor 55 is charged from the AC power supply 2 through the variable resistor 53, and when the voltage across the capacitor 55 reaches the breakover voltage of the diac 52, the triac 51 Is conducted.
  • the triac 51 is extinguished at the voltage zero cross point of the AC power supply. That is, the trigger (conduction) and self-extinguishing (non-conduction) of the triac 51 by the diac 52 are repeated every half cycle of the AC power supply.
  • the illumination load 3 can be dimmed by adjusting the resistance value of the variable resistor 53 and controlling the phase of the firing period of the triac 51.
  • the two-wire dimming switch 50 of the first conventional example adjusts the lighting load 3 by changing the resistance value of the variable resistor 53, the loss due to the variable resistor 53 is large. Further, since the voltage of the AC power supply 2 is directly applied to the variable resistor 53, the variable resistor 53 itself cannot be downsized, and downsizing of the two-wire dimmer switch 50 has a limit. Furthermore, when other devices connected to the same AC power supply 2 operate, a voltage change occurs in the AC power supply 2 and the brightness of the illumination load 3 changes instantaneously.
  • Japanese Patent Application Laid-Open No. 11-67479 discloses a timing for turning on a semiconductor switch element, that is, a timing for outputting a gate drive signal.
  • a dimmer switch that is controlled using a computer or the like has been proposed.
  • this dimmer switch is a three-wire type
  • FIG. 9 shows a circuit configuration (second conventional example) in which it is applied to a two-wire dimmer switch.
  • the secondary side phototriac 63 of the phototriac coupler 62 is connected to the gate electrode of the triac 61.
  • a rectifier circuit 65 is connected between the other electrodes of the triac 61, and the power that has been full-wave rectified by the rectifier circuit 65 is input to the power supply unit 66.
  • the control unit 67 is driven by DC power converted by the power supply unit 66.
  • the voltage of the AC power supply 2 for example, AC (AC) 100 V is applied to the rectifier circuit 65.
  • the controller 67 is driven with, for example, direct current (DC) 3 to 6V.
  • the phototriac coupler 62 optically isolates the control unit 67 and the semiconductor switch element 61.
  • the control unit 67 makes the transistor 69 conductive at a timing stored in advance in the look-up table according to the resistance value of the variable resistor 68 connected to the operation member operated by the user.
  • a current flows through the light emitting diode 64 on the primary side of the phototriac coupler 62, and the secondary side phototriac 63 is turned on.
  • the secondary side phototriac 63 of the phototriac coupler 62 becomes conductive, the load current starts to flow and the gate voltage of the triac 61 increases.
  • the triac 61 When the gate voltage of the triac 61 exceeds the threshold value, the triac 61 becomes conductive, and the current flowing from the AC power supply 2 to the lighting load 3 is commutated from the phototriac 63 to the triac 61 in the two-wire dimming switch 60, and the phototriac 63 becomes non-conductive.
  • the LED drive circuit 70 includes a rectifier circuit 71 that rectifies AC power, an inductor 72, a buffer capacitor 73 for storing power, an LED array 77, a capacitor 76 connected in parallel to the LED array 77, an LED It comprises an FET (Field (Effect Transistor) 75 for supplying a constant current to the array 77 and its driving IC 74.
  • FET Field (Effect Transistor
  • the LED bulb is an electronic circuit composed of a diode or an IC as a load.
  • Fig.11 (a) shows the waveform of the load voltage and load current of an incandescent lamp in the 1/2 cycle of AC power supply
  • FIG.11 (b) shows the waveform of the load voltage and load current of an LED bulb.
  • An incandescent bulb has a power factor of 1, and the voltage and current show almost the same waveform.
  • the load current is mainly for charging the capacitor 73, and instantaneously shows a large value simultaneously with the conduction of the triac, but soon decreases.
  • FIG. 12 shows a problem when the LED bulb is dimmed and controlled by the two-wire dimmer switch 50 of the first conventional example.
  • the triac 51 when the triac 51 is turned on, a large load current flows instantaneously, but immediately decreases.
  • the value of the load current becomes less than the holding current of the triac 51, the triac 51 is self-extinguished and becomes non-conductive.
  • the voltage of the capacitor 73 decreases, and the drive IC 74 controls to reduce the current flowing through the FET 75.
  • the electric current which flows into the LED array 77 will decrease, and the brightness of an LED bulb will fall. Further, the load current temporarily decreases due to the influence of noise superimposed on the AC power supply 2, or the voltage is applied to the AC power supply 2 by the operation of other devices connected to the same AC power supply 2 as shown in FIG. When the fluctuation occurs, the brightness of the LED bulb decreases.
  • the two-wire dimmer switch 60 of the second conventional example if a current is continuously supplied to the phototriac 63 on the secondary side of the phototriac coupler 62, a load current can be continuously supplied.
  • a current of several mA to several tens of mA flows through the phototriac 63, a large amount of power is consumed to maintain the conduction for a long time.
  • the LED bulb is substantially the electronic circuit itself as described above and consumes little power, if a large amount of power is consumed on the two-wire dimmer switch 60 side, it may become uncontrollable.
  • the present invention has been made to solve the above-described problems of the conventional example, and even when an LED bulb is connected as an illumination load, the brightness of the LED bulb is stabilized, and there is little flickering or fluctuation 2
  • An object is to provide a linear dimmer switch.
  • the two-wire dimmer switch according to the present invention is connected in series to an AC power source and a lighting load, A first connection terminal and a second connection terminal to which AC power is input; A main switching circuit connected between the first connection terminal and the second connection terminal and having the first semiconductor switch element as a main switch element; A rectifier circuit connected between the first connection terminal and the second connection terminal; A power supply circuit connected to the DC side of the rectifier circuit and securing an internal power supply of the two-wire dimmer switch; A frequency detection circuit connected to the DC side of the rectifier circuit and outputting a predetermined detection signal for detecting the frequency of the AC power supply; Connected to the DC side or AC side of the rectifier circuit, the second semiconductor switch element is used as an auxiliary switch element, and a load current flows when the main switch element is not conducting, and the main switch element or other semiconductor An auxiliary switching circuit for outputting a gate drive signal for conducting the switch element; A dimming amount setting circuit for setting a dimming amount to be adjusted by the user to adjust the brightness of
  • auxiliary switching circuit it is turned on by the gate drive signal output from the auxiliary switching circuit, and after the auxiliary switching circuit is turned on, a load current is passed when the main switch element is not turned on, and the main switch element is turned on. It is preferable to further include a quasi-main switching circuit that outputs a drive signal for the purpose.
  • the main switch element is a triac
  • the auxiliary switching circuit preferably uses a thyristor connected to the DC side of the rectifier circuit as an auxiliary switch element.
  • the main switch element is a triac
  • the auxiliary switching circuit includes two thyristors that are connected to the AC side of the rectifier circuit and are alternately turned on according to the polarity of the AC power supply as auxiliary switch elements.
  • the quasi-main switching circuit has a phototriac coupler as a switch element, a phototriac on the secondary side of the phototriac coupler is connected in parallel with the main switch element, and one terminal is a gate of the main switch element.
  • a light emitting diode on the primary side of the phototriac coupler is connected in series with the auxiliary switching circuit;
  • the holding current value of the phototriac is preferably smaller than the holding current value of the triac.
  • control circuit When the control circuit starts dimming control of the illumination load, it preferably outputs an initial drive signal for conducting the auxiliary switching circuit at a predetermined timing near the estimated voltage zero-cross point. .
  • the auxiliary switching circuit that outputs a gate drive signal to flow the load current when the main switch element is not conductive and to conduct the main switch element or other semiconductor switch elements.
  • a drive signal for conducting the auxiliary switching circuit is determined based on the dimming amount set by the dimming amount setting circuit and the voltage zero cross point, and a predetermined time before the next voltage zero cross point. The output continues until the second timing until the auxiliary switching circuit is maintained in the conductive state. Therefore, it is assumed that the lighting load is an LED bulb, and the load current becomes less than the holding current of the main switch element after the load current is commutated from the auxiliary switch circuit to the main switch circuit, and the main switch circuit becomes non-conductive. However, the load current can continue to flow through an auxiliary switching circuit or the like. As a result, the brightness of the LED bulb can be stabilized, and flicker and fluctuation can be reduced.
  • FIG. 1 is a circuit diagram showing a configuration of a two-wire dimmer switch according to a first embodiment of the present invention.
  • assistant switch circuit in 1st Embodiment conduct.
  • assistant switch circuit which show the influence of the load current by another apparatus become conductive.
  • the circuit diagram which shows the structure of the two-wire dimmer switch which concerns on 2nd Embodiment of this invention.
  • FIG. 1 shows a circuit configuration of a two-wire dimmer switch 1A according to the first embodiment.
  • the two-wire dimmer switch 1 ⁇ / b> A is connected in series to the AC power source 2 and the illumination load 3.
  • a switch 5 that controls lighting and extinction of the illumination load 3 may be provided integrally with the dimming variable resistor 4 of the two-wire dimming switch 1A, or the switch 5 may be provided separately. In the following description, a case where the switch 5 is provided separately from the two-wire dimmer switch 1A is illustrated.
  • the first connection terminal 1a and the second connection terminal 1b of the two-wire dimmer switch 1A are connected to the AC power source 2 or the lighting load 3 and the switch 5.
  • a main switching circuit 10 Connected between the first connection terminal 1a and the second connection terminal 1b is a main switching circuit 10 having a first semiconductor switch element such as a triac as a main switch element 11.
  • a rectifier circuit 12 is connected between the first connection terminal 1a and the second connection terminal 1b.
  • the rectifier circuit 12 receives the internal power of the two-wire dimmer switch 1A.
  • a power supply circuit 13 for securing is connected.
  • the power supply circuit 13 includes a switching circuit composed of a first transistor element 13a and a second transistor element 13b connected in Darlington, a Zener diode 13c and a resistor 13d connected to the base of the second transistor element 13b, and the like.
  • a constant voltage circuit (such as a three-terminal regulator) 14 and a buffer capacitor 15 for supplying DC constant voltage power to a control circuit 16 constituted by a processor or the like are included.
  • the switch 5 When the switch 5 is turned on, the pulsating current rectified by the rectifier circuit 12 is input to the power supply circuit 13, and the power whose output voltage is governed by the Zener voltage of the Zener diode 13c is output from the power supply circuit.
  • the electric power charges the buffer capacitor 15 and is stepped down to a predetermined voltage (for example, 3 V) by the constant voltage circuit 14 and is supplied to the control circuit 16.
  • a predetermined voltage for example, 3 V
  • the resistance value of the resistor 13d of the power supply circuit 13 is set to a value high enough to allow the current necessary for the operation of the second transistor element 13b to flow, the value of the current flowing to the ground via the Zener diode 13c is obtained. Therefore, the power loss can be reduced.
  • a frequency detection circuit 17 for detecting the frequency of the AC power supply 2 is connected to the DC output terminal of the rectifier circuit 12, and a predetermined detection signal output from the frequency detection circuit 17 is input to the control circuit 16. Further, the DC side output terminal of the rectifier circuit 12 is a thyristor for passing a current through the illumination load 3 until the main switch element 11 of the main switching circuit 10 is turned on or when the main switch element 11 is not turned on. An auxiliary switching circuit 18 having the second semiconductor switch element as an auxiliary switch element is connected. The control circuit 16 is connected to a dimming amount setting circuit 4 composed of a variable resistor or the like operated by a user. In the following description, the main switch element is referred to as a triac 11 and the auxiliary switching circuit or auxiliary switch element is referred to as a thyristor 18 as necessary.
  • the frequency detection circuit 17 is configured such that the pulsating current output from the rectifier circuit 12 is input to the base of the transistor element 17a, and a predetermined detection signal is transmitted from the frequency detection circuit 17 in accordance with the frequency of the AC power supply 2. 16 is input.
  • the control circuit 16 detects the frequency (50 Hz or 60 Hz) of the AC power supply 2 from the detection signal of the frequency detection circuit 17 and estimates the voltage zero cross point based on the detection. Then, a gate drive signal is input to the gate terminal of the thyristor 18 based on the detected frequency and the estimated voltage zero cross point.
  • FIG. 2 shows respective waveforms of the load voltage, load current, and gate drive signal in a half cycle of the AC power supply 2 when an LED bulb is used as the illumination load 3.
  • the rising edge of the gate drive signal searches a lookup table stored in advance in the control circuit 16 based on the resistance value of the light adjustment amount setting circuit (variable resistor) 4. To be determined.
  • the fall of the gate drive signal (second timing when the thyristor 18 becomes non-conductive) is set to a short time ⁇ t (for example, 1 ms) from the voltage zero cross point of the AC power supply 2.
  • the predetermined time ⁇ t is a time sufficient for the control circuit 16 to estimate the next voltage zero-cross point based on the detection signal from the frequency detection circuit 17, for example.
  • the control circuit 16 starts outputting the gate drive signal at the first timing based on the resistance value of the light control amount setting circuit (variable resistor) 4 (rises the gate drive signal).
  • the gate drive signal is input to the gate terminal of the thyristor 18, the thyristor 18 becomes conductive and current starts to flow through the lighting load 3. Further, since the current flowing through the thyristor 18 also flows through the gate electrode of the triac 11, the triac 11 becomes conductive when the voltage and current exceed the gate voltage threshold value and the turn-on current of the triac 11, and the load current flows from the thyristor 18 to the triac 11. To commutate.
  • the load current instantaneously shows a large value simultaneously with the conduction of the thyristor 18 or the triac 11 as described above, but immediately becomes small.
  • the value of the load current becomes less than the holding current of the triac 11, the triac 11 is self-extinguished and becomes non-conductive.
  • the control circuit 16 stops the output of the gate drive signal (falls the gate drive signal) at a second timing just before the voltage zero cross point of the AC power supply 2 by a predetermined time ⁇ t.
  • the pulsating current output from the rectifier circuit 12 is diverted from the thyristor 18 to the power supply circuit 13 and the frequency detection circuit 17, so that the control circuit 16 is based on the detection signal from the frequency detection circuit 17.
  • the next voltage zero cross point of the AC power supply 2 can be estimated, and the timing of starting the output of the next gate drive signal can be controlled with the estimated voltage zero cross point as a reference.
  • the two-wire dimmer switch 1A allows a current to flow through the illumination load 3 until the main switch element (triac) 11 of the main switching circuit 10 is turned on or when the main switch element 11 is not turned on. Since the auxiliary open / close circuit (thyristor) 18 is provided, the load current value is less than the holding current of the triac 11 and the thyristor 18 is conductive even when the triac 11 is nonconductive. Continues to flow through thyristor 18. As a result, the brightness of the LED bulb is stabilized, and flickering and fluctuation that can be seen with the naked eye hardly occur.
  • the current can be continuously supplied to the load via the auxiliary switching circuit (thyristor) 18. Further, the gate drive signal input to the gate electrode of the thyristor 18 is stopped at the second timing just before the voltage zero cross point of the AC power source 2 by a predetermined time ⁇ t, so that the next voltage zero cross point of the AC power source 2 is accurately determined. Can be estimated. Further, as shown in FIG. 3, even if other devices connected to the same AC power supply 2 operate, the load current continues to flow through the thyristor 18, so that the brightness of the illumination load 3 hardly changes. Also, the load voltage waveform does not change much. Needless to say, a triac 11 having a small holding current value is selected and used.
  • FIG. 4 shows a circuit configuration of a two-wire dimmer switch 1B according to the second embodiment.
  • the two-wire dimmer switch 1B is obtained by adding a phototriac coupler 20 as a quasi-main switching circuit to the two-wire dimmer switch 1A according to the first embodiment.
  • a secondary side phototriac 21 of the phototriac coupler 20 is connected in parallel to a main switching circuit (triac) 11, and a primary side light emitting diode 22 is connected in series to an auxiliary switching unit (thyristor) 18.
  • a main switching circuit triac
  • thyristor auxiliary switching unit
  • the load current is commutated to the phototriac 21.
  • the load current value is small and less than the holding current value of the TRIAC 11 of the main switching circuit, the TRIAC 11 of the main switching circuit is not conducted, and the load current remains as it is in the phototriac 21 that is a quasi-main switching circuit. Flowing through.
  • the load current value is large and exceeds the holding current value of the triac 11 of the main switching circuit, the triac 11 of the main switching circuit becomes conductive, and the load current is commutated to the triac 11.
  • the illumination load 3 is an LED bulb
  • the load current value is less than the holding current of the triac 11
  • the triac 11 is self-extinguished and becomes non-conductive, but the thyristor 18 is conductive and the load current is the thyristor 18.
  • the primary side light emitting diode 22 of the phototriac coupler 20 emits light
  • the secondary side phototriac 21 is turned on, and the load current is commutated to the phototriac 21. Since the holding current value of the phototriac 21 is smaller than the holding current value of the triac 11 as described above, the load current can continue to flow stably.
  • the two-wire dimmer switch 1B according to the second embodiment is slightly different from the two-wire dimmer switch 1A according to the first embodiment in that a phototriac coupler 20 is added as a quasi-main switching circuit.
  • the structure is complicated, which increases the cost.
  • the load current flows exclusively through the phototriac 21 on the upstream side (AC side) of the rectifier circuit 12, that is, the load current does not pass through the diode bridge. Loss due to bridges is eliminated. As a result, the change in the brightness of the LED bulb becomes very small, and there is almost no flickering or fluctuation that can be seen with the naked eye.
  • FIG. 5 shows a circuit configuration of a two-wire dimmer switch 1C according to the third embodiment.
  • the two-wire dimmer switch 1C is provided with two auxiliary open / close circuits (thyristors) 18a and 18b in the two-wire dimmer switch 1A according to the first embodiment, and the anode of each thyristor is an alternating current of the rectifier circuit 12.
  • the cathode is connected to the DC negative terminal of the rectifier circuit 12 on the side.
  • the gate drive signal output from the control circuit 16 is branched by the diodes 25a and 25b and input to the gate terminals of the thyristors 18a and 18b. That is, one of the two thyristors 18a and 18b is used as an auxiliary switching circuit depending on the polarity of the AC power supply 2.
  • Other configurations and operations are the same as those of the two-wire dimmer switch 1A according to the first embodiment.
  • the two-wire dimmer switch 1C according to the third embodiment is added with a thyristor, a resistor, and a capacitor constituting an auxiliary switching circuit, compared to the two-wire dimmer switch 1A according to the first embodiment.
  • the structure is slightly complicated, which increases the cost.
  • the load current does not pass through one diode constituting the rectifier circuit 12 after the triac 11 is turned off, the loss is reduced accordingly.
  • the illumination load 3 is an LED bulb, the load current value is very small. Therefore, the smaller the loss of one diode, the smaller the flickering and fluctuation of the LED bulb.
  • FIG. 6 shows a circuit configuration of a two-wire dimmer switch 1D according to the fourth embodiment.
  • the two-wire dimmer switch 1D is a combination of the features of the two-wire dimmer switch 1B according to the second embodiment and the two-wire dimmer switch 1C according to the third embodiment.
  • a phototriac coupler 20 and two auxiliary switching circuits (thyristors) 18a and 18b are provided.
  • the first to fourth embodiments relate to the structure of the two-wire dimmer switch, but the fifth embodiment relates to a control method in any of the two-wire dimmer switches 1A to 1D.
  • the two-wire dimmer switches 1A to 1D and the LED bulb driving circuit 70 shown in FIG. 10 each have a circuit configuration for converting AC power to DC power and storing the power in a buffer capacitor. Therefore, for example, when the switch 5 is turned off for a long time, it is considered that any buffer capacitor is discharged and no electric power remains.
  • the switch 5 is turned on, the two-wire dimming switches 1A to 1D are activated, and the control circuit 16 outputs a gate drive signal to start supplying power to the illumination load 3.
  • the drive circuit 70 is not activated even when the supply of power is started, and thus the operation and impedance characteristics are different from those during steady lighting. That is, when the supply of power to the LED bulb driving circuit 70 is started, the buffer capacitor 73 is charged first. Therefore, when the LED bulb is started, the capacitance component of the buffer capacitor 73 exhibits dominant impedance characteristics.
  • the voltage of the AC power supply 2 is relatively high, when a current begins to flow through the LED bulb driving circuit 70, the buffer capacitor 73 is rapidly charged, and the two-wire dimmer switches 1A to 1D and the LED bulb driving circuit are charged. A large power factor difference with 70 occurs.
  • the phase of the voltage applied to each of them differs from the phase of the AC power supply 2.
  • the voltage of the AC power supply 2 is 100V and the load voltage is ⁇ 30V
  • the voltage between the connection terminals 1a and 1b of the two-wire dimmer switches 1A to 1D (referred to as an inter-switch voltage) is 130V. That is, the voltage zero cross point of the AC power supply 2 is different from the inter-switch voltage zero cross point of the two-wire dimmer switches 1A to 1D.
  • the two-wire dimmer switches 1A to 1D are originally intended to perform control with reference to the voltage zero cross point of the AC power supply 2, but the control circuit 16 detects the inter-switch voltage zero cross point from the output of the frequency detection circuit 17. Dimming control is performed by estimating. Therefore, if the control is performed at a timing different from the voltage zero cross point of the AC power supply 2 (a gate drive signal is output), there is a possibility that the original stable dimming control cannot be performed.
  • FIG. 7 shows the waveform of each part by the control method according to the fifth embodiment.
  • the phase of the voltage waveform of the AC power supply 2 and the phase of the voltage waveform between the switches of the two-wire dimmer switches 1A to 1D are the same.
  • the first gate drive signal input to the gate terminal from the control circuit 16 to the thyristor 18 of the auxiliary switching circuit is obtained from the output of the frequency detection circuit 17. Output near the estimated inter-switch voltage zero cross point (for example, within ⁇ several ms with respect to the inter-switch voltage zero cross point).
  • the timing for outputting the first gate drive signal does not necessarily need to be before the voltage zero-cross point, and may be after the voltage zero-cross point. By doing so, charging of the buffer capacitor 73 of the LED bulb driving circuit 70 can be started from a low level of the voltage of the AC power supply 2.
  • the impedance change between the two-wire dimmer switches 1A to 1D and the LED bulb drive circuit 70 is abrupt.
  • the half-cycle power of the AC power supply 2 can be shared by the two-wire dimmer switches 1A to 1D and the LED bulb driving circuit 70.
  • stable dimming control can be performed.
  • the triac that is a single bidirectional semiconductor switching element is exemplified as the main switching element.
  • the present invention is not limited to this, and the main switching element is not limited to the triac as long as it has a structure that allows current to flow bidirectionally.
  • an IGBT Insulated Gate Bipolar Transistor
  • an FET connected in antiparallel may be used.

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PCT/JP2012/007762 2012-01-17 2012-12-04 ２線式調光スイッチ WO2013108331A1 (ja)

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KR1020147018426A KR101626694B1 (ko) 2012-01-17 2012-12-04 2선식 조광 스위치
CN201280067041.1A CN104041188B (zh) 2012-01-17 2012-12-04 双线式调光开关

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JP2012007529A JP5975375B2 (ja) 2012-01-17 2012-01-17 ２線式調光スイッチ

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CN103957636A (zh) * 2014-04-28 2014-07-30 Tcl-罗格朗国际电工（惠州）有限公司 两线制调光电路
CN111372360A (zh) * 2019-12-30 2020-07-03 欧普照明股份有限公司 切相调光电路
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WO2015136899A1 (ja) * 2014-03-11 2015-09-17 パナソニックＩｐマネジメント株式会社 調光装置
KR102075896B1 (ko) * 2015-06-08 2020-02-11 파나소닉 아이피 매니지먼트 가부시키가이샤 조광 장치
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TW201545606A (zh) 2015-12-01
TWI581667B (zh) 2017-05-01
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TWI504316B (zh) 2015-10-11
KR101626694B1 (ko) 2016-06-01

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