WO2018123056A1 - Dispositif d'éclairage et appareil d'éclairage - Google Patents

Dispositif d'éclairage et appareil d'éclairage Download PDF

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Publication number
WO2018123056A1
WO2018123056A1 PCT/JP2016/089196 JP2016089196W WO2018123056A1 WO 2018123056 A1 WO2018123056 A1 WO 2018123056A1 JP 2016089196 W JP2016089196 W JP 2016089196W WO 2018123056 A1 WO2018123056 A1 WO 2018123056A1
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WIPO (PCT)
Prior art keywords
delay time
control unit
mosfet
output
lighting device
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PCT/JP2016/089196
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English (en)
Japanese (ja)
Inventor
岳秋 飯田
雄一郎 伊藤
Original Assignee
三菱電機株式会社
三菱電機照明株式会社
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 三菱電機株式会社, 三菱電機照明株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2016/089196 priority Critical patent/WO2018123056A1/fr
Priority to JP2018558794A priority patent/JP6694078B2/ja
Priority to PCT/JP2017/025307 priority patent/WO2018123115A1/fr
Publication of WO2018123056A1 publication Critical patent/WO2018123056A1/fr
Priority to JP2020073450A priority patent/JP2020109775A/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
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • 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
    • H05B47/17—Operational modes, e.g. switching from manual to automatic mode or prohibiting specific operations

Definitions

  • the present invention relates to a lighting device and a lighting fixture for lighting a light source.
  • the lighting device has a PFC (Power Factor Correction) circuit that is a power factor correction circuit for suppressing harmonics of the input current and improving the power factor.
  • PFC Power Factor Correction
  • Patent Document 1 discloses a method of suppressing an increase in switching frequency at light load and suppressing decrease in on-time by switching the operation mode of the PFC circuit to current discontinuous mode control at light load. Yes.
  • Patent Document 1 has a high harmonic suppression effect because the PFC circuit operates by current critical mode control at high output.
  • the current critical mode control has a problem that the switching loss is large because the switching frequency is higher than that in the case of performing the current discontinuous mode control.
  • the present invention has been made in view of the above, and an object thereof is to obtain a lighting device capable of reducing switching loss while suppressing harmonics of input current.
  • the lighting device improves the power factor by suppressing the harmonics of the rectifier circuit that rectifies AC power and is output from the rectifier circuit.
  • a DC conversion circuit that converts DC power into DC power and supplies the light source to the light source, and a control unit that controls the DC conversion circuit.
  • the DC conversion circuit is disposed between the smoothing capacitor and the smoothing capacitor and rectifier circuit.
  • the control unit includes a switching element and a coil through which a current output from the rectifier circuit flows, and the control unit switches the switching element from the time when the current flowing through the coil becomes zero until a delay time set in the control unit elapses. The switching element is turned on when the delay time elapses after being turned off.
  • the lighting device according to the present invention has an effect of reducing switching loss while suppressing harmonics of the input current.
  • FIG. 1 shows the structure of the electric current control part shown in FIG. Timing chart showing the relationship between the current flowing through the light source, the current flowing through the coil, and the control signal of the MOSFET (Metal Oxide Semiconductor Field Effect Transistor) 1 is a timing chart showing the relationship between the current flowing through the coil constituting the PFC circuit shown in FIG. 1, the drain voltage of the MOSFET, and the gate voltage of the MOSFET.
  • MOSFET Metal Oxide Semiconductor Field Effect Transistor
  • Diagram showing the waveform when dimming with current critical mode control without delay time Diagram showing waveform when dimming with delay time
  • FIG. 1 is a configuration diagram of a lighting device and a lighting fixture according to the first embodiment.
  • the luminaire 200 is connected to the AC power source 1 and converts the power supplied from the AC power source 1 through the input filter 2 that smoothes the AC current output from the AC power source 1 into a DC current that can be input to the light source 8.
  • the lighting device 100 that outputs the light
  • the light source 8 that is turned on by the power supplied from the lighting device 100
  • the dimmer 10 that outputs a dimming signal for turning on, turning off, or dimming the light source 8.
  • the light source 8 is composed of an LED group in which a plurality of LEDs are directly connected. One end of the LED group is connected to the positive side DC bus P, and the other end of the LED group is connected to the negative side DC bus N.
  • the lighting device 100 includes an input filter 2, a rectifier circuit 3 connected to the input filter 2, a capacitor 4 connected in parallel to the rectifier circuit 3, a DC conversion circuit 30, and a current detection that detects a current flowing through the light source 8. And a control unit 9 for controlling the PFC circuit 5 and the current control unit 7.
  • the DC conversion circuit 30 has a function of improving the power factor by suppressing harmonics of the current input from the AC power supply 1 and converting the power output from the rectifier circuit 3 into DC power and supplying it to the light source 8.
  • the DC conversion circuit 30 includes a PFC circuit 5 for improving the power factor by suppressing harmonics of the current input from the AC power supply 1, a smoothing capacitor 6 for smoothing the output voltage of the PFC circuit 5, and a light source 8. And a current control unit 7 for controlling the magnitude of the output current.
  • the input filter 2 disposed between the AC power supply 1 and the rectifier circuit 3 includes a coil 21 and a capacitor 22 and reduces high-frequency noise superimposed on the current output from the AC power supply 1.
  • the coil 21 is connected in series to the AC power source 1.
  • One end of the coil 21 is connected to one end of the AC power supply 1, and the other end of the coil 21 is connected to the capacitor 22 and the rectifier circuit 3.
  • the other end of the capacitor 22 is connected to the AC power source 1 and the rectifier circuit 3.
  • the rectifier circuit 3 is disposed between the input filter 2 and the PFC circuit 5 and converts AC power supplied from the AC power source 1 into DC power.
  • the rectifier circuit 3 is composed of a diode bridge in which four diodes are combined.
  • the configuration of the rectifier circuit 3 is not limited to this, and may be configured by combining MOSFETs that are unidirectional conducting elements.
  • the capacitor 4 is connected in parallel to the output of the rectifier circuit 3, and smoothes the output voltage of the rectifier circuit 3.
  • One end of the capacitor 4 is connected to the positive side DC bus P, and the other end of the capacitor 4 is connected to the negative side DC bus N.
  • the PFC circuit 5 is disposed between the rectifier circuit 3 and the current control unit 7.
  • the PFC circuit 5 includes a MOSFET 51 that is a switching element, a coil 52, and a diode 53.
  • the PFC circuit 5 boosts the output voltage of the rectifier circuit 3 by turning on and off the MOSFET 51 by the control unit 9, and outputs the boosted voltage to the smoothing capacitor 6. Further, the PFC circuit 5 has a function of suppressing the harmonics of the input current and improving the power factor by the control described later.
  • the PFC circuit 5 is configured by a boost chopper circuit will be described.
  • the PFC circuit 5 may be configured by a circuit such as a step-up / step-down chopper circuit, a flyback circuit, a flyforward circuit, a SEPIC (Single Ended Primary Inverter Converter), a Zeta converter, or a Cuk converter.
  • a circuit such as a step-up / step-down chopper circuit, a flyback circuit, a flyforward circuit, a SEPIC (Single Ended Primary Inverter Converter), a Zeta converter, or a Cuk converter.
  • the coil 52 is disposed between the capacitor 4 and the MOSFET 51 on the positive side DC bus P.
  • a primary winding 52 a and a secondary winding 52 b are formed in the coil 52 by winding an insulating wire around a core (not shown).
  • One end of the primary winding 52 a is connected to one end of the capacitor 4.
  • the other end of the primary winding 52 a is connected to the anode of the diode 53.
  • One end of the secondary winding 52b is connected to the control unit 9, and the other end of the secondary winding 52b is connected to the negative-side DC bus N.
  • a voltage having a different polarity is applied to the primary winding 52a as the MOSFET 51 is turned on / off.
  • the voltage generated in the secondary winding 52b is equal to the voltage corresponding to the applied voltage of the primary winding 52a and the turns ratio n.
  • the drain of the MOSFET 51 is connected to the primary winding 52 a and the anode of the diode 53 in the positive side DC bus P.
  • the source of the MOSFET 51 is connected to the other end of the capacitor 4, the other end of the secondary winding 52 b, and the other end of the smoothing capacitor 6 on the negative DC bus N.
  • the gate of the MOSFET 51 is connected to the control unit 9. A control signal output from the control unit 9 is input to the gate of the MOSFET 51. On / off control of the MOSFET 51 is performed by inputting the control signal.
  • the diode 53 is disposed between the MOSFET 51 and the smoothing capacitor 6 in the positive side DC bus P.
  • the anode of the diode 53 is connected to the coil 52 and the MOSFET 51, and the cathode of the diode 53 is connected to the smoothing capacitor 6.
  • the smoothing capacitor 6 is disposed between the PFC circuit 5 and the current control unit 7. One end of the smoothing capacitor 6 is connected to the positive side DC bus P, and the other end of the smoothing capacitor 6 is connected to the negative side DC bus N.
  • the current detector 11 detects a current flowing through the light source 8 and outputs current information corresponding to the detected current value to the controller 9.
  • a configuration in which a current is detected using a shunt resistor or a hall sensor can be exemplified.
  • the control unit 9 includes a target value output unit 91, a zero current detection unit 92, a switching control unit 93, a current input unit 94, and a voltage detection unit 95.
  • the target value output unit 91 is connected to the dimmer 10, and the target value output unit 91 determines an output current target value corresponding to the type of the dimming signal output from the dimmer 10, and the determined output current The target value is output to the switching control unit 93.
  • the output current target value is a signal that specifies a current target value that the lighting device 100 outputs to the light source 8.
  • the voltage detector 95 detects the voltage of the smoothing capacitor 6 and outputs voltage information corresponding to the detected voltage value to the switching controller 93.
  • An example of the voltage detector 95 is a voltage dividing circuit. In the voltage dividing circuit, one end of a series resistor in which two resistors are connected in series is connected to the positive side DC bus P, and the other end of the series resistor is connected to the negative side DC bus N. This circuit divides the voltage applied to the smoothing capacitor 6.
  • the switching control unit 93 outputs a control signal for controlling the current control unit 7 based on the output current target value output from the target value output unit 91 and the current information input to the current input unit 94.
  • the switching control unit 93 stores the output voltage target value of the PFC circuit 5 in advance, and based on at least the voltage information output from the voltage detection unit 95 and the stored output voltage target value. A control signal for controlling the signal is output.
  • the current control unit 7 converts the DC voltage output from the PFC circuit 5 into a DC current that can be input to the light source 8 based on the control signal output from the switching control unit 93.
  • FIG. 2 is a diagram showing a configuration of the current control unit shown in FIG.
  • the current control unit 7 shown in FIG. 2 includes a step-down chopper circuit.
  • a circuit such as a step-up / step-down chopper circuit, a flyback circuit, a fly-forward circuit, a SEPIC, a Zeta converter, or a Cuk converter is used. It may be composed of
  • the current control unit 7 includes a MOSFET 71, a coil 72, a diode 73, and a capacitor 74.
  • MOSFET 71 is arranged on positive side DC bus P.
  • the drain of the MOSFET 71 is connected to one end of the smoothing capacitor 6 and the cathode of the diode 53 shown in FIG.
  • the source of the MOSFET 71 is connected to the cathode of the diode 73 and one end of the coil 72.
  • the gate of the MOSFET 71 is connected to the switching control unit 93.
  • a control signal output from the switching control unit 93 is input to the gate of the MOSFET 71.
  • the control signal is a signal for controlling on / off of the MOSFET 71.
  • One end of the coil 72 is connected to the source of the MOSFET 71 and the cathode of the diode 73.
  • the other end of the coil 72 is connected to one end of the capacitor 74 and one end of the light source 8 shown in FIG.
  • the cathode of the diode 73 is connected to the source of the MOSFET 71 and one end of the coil 72.
  • the anode of the diode 73 is connected to the other end of the smoothing capacitor 6 shown in FIG. 1, the other end of the capacitor 74, and the other end of the light source 8 shown in FIG.
  • FIG. 3 is a timing chart showing the relationship between the current flowing through the light source, the current flowing through the coil, and the control signal of the MOSFET.
  • FIG. 3 shows the current flowing through the light source 8, the current flowing through the coil 72, and the control signal of the MOSFET 71 in order from the top.
  • the horizontal axis represents time.
  • the switching cycle Tsw is equal to the time from when the control signal of the MOSFET 71 changes from OFF to ON until the control signal of the MOSFET 71 changes from OFF to ON again.
  • the switching period Tsw is set in the switching control unit 93 in advance.
  • the on time Ton is equal to the time from when the control signal of the MOSFET 71 changes from off to on until it changes from on to off.
  • the current flowing through the coil 72 has a triangular waveform, but the current output to the light source 8 is smoothed by the capacitor 74, and the average value of the current flowing through the coil 72 is output from the current control unit 7.
  • the switching control unit 93 makes the switching period Tsw for turning on the MOSFET 71 constant, and changes the on-time Ton according to the target value of the output current.
  • the control method for obtaining a specific output by adjusting the on-time Ton in this way is called duty control because the ratio of the on-time Ton to the switching period Tsw is called duty.
  • FIG. 4 is a timing chart showing the relationship between the current flowing through the coil constituting the PFC circuit shown in FIG. 1, the drain voltage of the MOSFET, and the gate voltage of the MOSFET.
  • FIG. 4 shows, in order from the top, the current of the AC power source 1 input to the lighting device 100, the current flowing through the coil 52, the drain voltage of the MOSFET 51, and the gate voltage of the MOSFET 51.
  • the horizontal axis represents time.
  • the current of the AC power supply 1 input to the lighting device 100 is indicated as “input current”.
  • the cycle in which the gate voltage of the MOSFET 51 is turned on and off is shown longer than the actual period.
  • the period when the gate voltage of the MOSFET 51 is turned on and off is equal to the time from when the gate voltage of the MOSFET 51 changes from off to on until when the gate voltage of the MOSFET 51 changes from off to on again.
  • the MOSFET 51 When the ON time set in the switching control unit 93 has elapsed, the MOSFET 51 is turned off, thereby forming a closed circuit of the coil 52, the diode 53, and the smoothing capacitor 6. In this closed circuit, the energy accumulated in the coil 52 is released, and the smoothing capacitor 6 is charged.
  • the OFF state of the MOSFET 51 is maintained from when the current flowing through the coil 52 becomes zero until the delay time Tdelay elapses, and when the delay time Tdelay elapses, the MOSFET 51 is turned on again. That is, the control signal of the MOSFET 51 remains off until the delay time Tdelay elapses from the time when the current flowing through the coil 52 becomes zero, and the control signal of the MOSFET 51 is turned on when the delay time Tdelay elapses. Change.
  • the current flowing through the coil 52 has a triangular waveform, and the apex thereof becomes a sine wave envelope as indicated by a dotted line.
  • the current input from the AC power source 1 is smoothed by the input filter 2, and the average value of the coil current flowing through the coil 21 is input to form a sine wave current waveform.
  • the control unit 9 detects the voltage applied to the smoothing capacitor 6 and performs feedback control so that the detected voltage follows the target value, whereby the on-time of the MOSFET 51 is controlled.
  • the response time of the feedback control is set so that the loop gain of the feedback control becomes 1 time (0 dB) or less after being 1/2 of 1 cycle of the AC power supply 1. In other words, the response time of the feedback control is set to be 1 (0 dB) or less at a frequency that is 2 times or less of the frequency of the AC power supply 1.
  • the feedback control loop gain is set to 1 (0 dB) or less at a frequency of 100 Hz or less of a half cycle (half wave) of the power supply frequency, that is, a cycle of 10 msec or more.
  • the feedback control is set so as not to respond in a cycle shorter than 1 ⁇ 2 of the power cycle.
  • the same effect can be obtained by setting the on-time update cycle to a cycle corresponding to half the cycle of the AC power supply 1 or a cycle longer than the cycle corresponding to half the cycle of the AC power supply 1.
  • the MOSFET 51 is switching-controlled by current critical mode control without providing the delay time Tdelay. Therefore, the average value of the current flowing through the coil 52 becomes a complete sine wave, and high power A rate improvement effect can be expected.
  • the lighting device 100 provides the delay time Tdelay and performs switching control of the MOSFET 51 by current discontinuous mode control, thereby lowering the switching frequency compared to the case of current critical mode control. Therefore, the switching loss generated in the MOSFET 51 can be reduced.
  • the delay time Tdelay is set within a range in which an increase in harmonics can be allowed.
  • An example of a range in which an increase in harmonics is allowable is within a current harmonic limit value defined by Japanese Industrial Standards.
  • the control unit 9 turns on the MOSFET 51 near the bottom of the voltage oscillation of the MOSFET 51 so that the drain voltage has a steep drain voltage. It is possible to suppress fluctuations and suppress noise caused by switching.
  • the control unit 9 turns on the MOSFET 51 at least at the second and subsequent bottoms of the bottom of the voltage oscillation of the MOSFET 51, so that a delay time can be provided with certainty.
  • the switching control unit 93 performs control so as to shorten the ON time of the MOSFET 51 in order to reduce the input current of the AC power supply 1.
  • FIG. 5 is a diagram showing a waveform when dimming with current critical mode control without providing a delay time
  • FIG. 6 is a diagram showing a waveform when dimming with a delay time. 5 and 6 are for explaining an outline of the switching operation of the PFC circuit 5 when the light source 8 is dimmed.
  • FIGS. 5 and 6 shows the input current of the AC power supply 1, the current flowing through the coil 52, the drain voltage of the MOSFET 51, and the gate voltage of the MOSFET 51, as in FIG. 4.
  • the horizontal axis represents time.
  • FIG. 7 is a graph showing the on-time and switching frequency characteristics of the MOSFET, which change according to the dimming rate.
  • FIG. 7 shows, in order from the top, the delay time Tdelay, the ON time of the MOSFET 51, the switching frequency of the control signal for controlling the MOSFET 51, and the dimming rate of the light source 8.
  • the dotted line represents the delay time Tdelay, the ON time of the MOSFET 51, and the switching frequency when the dimming rate is changed when the current critical mode control is performed.
  • a solid line represents the delay time Tdelay, the ON time of the MOSFET 51, and the switching frequency when the dimming rate is changed when the current discontinuous mode control in which the delay time is set is performed.
  • the delay time Tdelay By providing the delay time Tdelay and performing the current discontinuous mode control, an increase in switching frequency during dimming can be suppressed and switching loss can be reduced as compared with current critical mode control. Further, the ON time of the MOSFET 51 can be lengthened, and the MOSFET 51 can be controlled on and off more reliably.
  • FIG. 8 is a first diagram showing the MOSFET on-time and switching frequency when the delay time is changed in accordance with the dimming rate.
  • a threshold value is provided for the dimming rate, and when the dimming rate exceeds the threshold value, the control unit 9 sets the delay time as the first delay time Tdelay 1st, and the dimming rate is the threshold value.
  • the delay time is the second delay time Tdelay2nd.
  • the second delay time Tdelay2nd is longer than the first delay time Tdelay1st, and is longer as the dimming rate decreases.
  • the threshold, the first delay time Tdelay1st, and the second delay time Tdelay2nd shown in FIG. 8 are set in the control unit 9 in advance.
  • the first delay time Tdelay1st is set when a dimming rate exceeding the threshold is input
  • the second delay time Tdelay2nd is set when a dimming rate less than the threshold is input.
  • the control unit 9 stores the minimum on-time Ton_min.
  • the dimming control can be performed so that the on-time of the MOSFET 51 is not shorter than the minimum on-time Ton_min.
  • FIG. 9 is a second diagram showing the MOSFET on-time and switching frequency when the delay time is changed in accordance with the dimming rate.
  • a plurality of threshold values 1, 2, and 3 are set for the dimming rate.
  • the plurality of thresholds 1, 2, and 3 are higher in the order of threshold 3, threshold 2, and threshold 1.
  • a plurality of delay times Tdelay 1, 2, 3, 4 corresponding to a plurality of threshold values 1, 2, 3 are set. It is assumed that a plurality of threshold values 1, 2, 3 and a plurality of delay times Tdelay 1, 2, 3, 4 are set in the control unit 9.
  • Delay time Tdelay4 is set when a dimming rate of threshold 3 or less is input.
  • the delay time Tdelay3 is set when a dimming rate that exceeds the threshold 3 and is equal to or less than the threshold 2 is input.
  • the delay time Tdelay2 is set when a dimming rate that exceeds the threshold 2 and is equal to or less than the threshold 1 is input.
  • the delay time Tdelay1 is set when a dimming rate exceeding the threshold value 1 is input.
  • the control unit 9 provides a plurality of threshold values for the dimming rate, and controls the switching elements using a plurality of delay times having different lengths according to a range between adjacent threshold values. Specifically, when the delay time Tdelay1 is provided and the light is dimmed in the direction in which the current of the light source 8 decreases and the dimming rate reaches the threshold value 1, the on-time of the MOSFET 51 is the minimum on-time. When the time is shortened to the time Ton_min, the control unit 9 increases the delay time from Tdelay1 to Tdelay2. This can prevent the on time of the MOSFET 51 from becoming shorter than the minimum on time Ton_min.
  • FIG. 10 is a diagram showing changes over time in delay time, MOSFET on-time, and light source dimming rate when the delay time is extended from Tdelay1 to Tdelay2 with threshold value 1 of dimming rate shown in FIG. is there.
  • the delay time Tdelay When the delay time Tdelay is abruptly extended, the switching frequency of the MOSFET 51 suddenly changes, the output of the PFC circuit 5 fluctuates, and the voltage of the smoothing capacitor 6 fluctuates, so that the output current of the current control unit 7 connected to the subsequent stage is constant. Therefore, the light source 8 cannot be lit stably. Therefore, when the delay time Tdelay is extended, the change amount maximum value Tstep of the delay time Tdelay is provided, and the maintenance time Tk that maintains the delay time Tdelay without change is provided, thereby delaying the time change of the delay time Tdelay. be able to. By performing this control, a sudden change in the switching frequency of the MOSFET 51 can be suppressed.
  • the maintenance time Tk for maintaining the delay time Tdelay is set longer than the response time for feedback control of the ON time of the MOSFET 51. As a result, a time during which the ON time of the MOSFET 51 is constant is ensured, and the output of the PFC circuit 5 can be stabilized.
  • FIG. 11 is a flowchart for explaining the operation of the control unit when extending the delay time.
  • the controller 9 When the light source 8 is turned on with the delay time Tdelay1 provided, the controller 9 performs dimming in the direction of decreasing the current of the light source 8 (S11), and when the dimming rate is greater than the threshold 1 (S12, No ), The delay time is not changed (S15). When the dimming rate is equal to or less than the threshold value 1 (S12, Yes), the control unit 9 does not change the delay time unless the delay time maintenance time Tk has elapsed after the final change of the delay time (S13, No). (S15).
  • the control unit 9 does not change the delay time if the delay time is Tdelay2 or more (S14, No) ( S15). If the delay time is smaller than Tdelay2 (S14, Yes), the delay time is extended by Tstep (S16).
  • the control unit 9 changes the delay time from Tdelay2 to Tdelay1. To shorten.
  • FIG. 12 is a diagram showing temporal changes in delay time, MOSFET on-time, and light source dimming rate when the delay time is shortened from Tdelay2 to Tdelay1 with the threshold value 1 of dimming rate shown in FIG. is there.
  • the delay time is sharply shortened, the switching frequency of the MOSFET 51 suddenly changes, the output of the PFC circuit 5 fluctuates, and the voltage of the smoothing capacitor 6 fluctuates, so that the output current of the current control unit 7 connected to the subsequent stage is constant Therefore, the light source 8 cannot be lit stably.
  • the delay time Tdelay is shortened, the change amount maximum value Tstep of the delay time Tdelay is provided, and the maintenance time Tk that maintains the delay time Tdelay without change is provided, thereby delaying the time change of the delay time Tdelay. can do.
  • a sudden change in the switching frequency of the MOSFET 51 can be suppressed.
  • the maintenance time Tk for maintaining the delay time Tdelay is set longer than the response time for feedback control of the ON time of the MOSFET 51. As a result, a time during which the ON time of the MOSFET 51 is constant is ensured, and the output of the PFC circuit 5 can be stabilized.
  • FIG. 13 is a flowchart for explaining the operation of the control unit when the delay time is shortened.
  • the control unit 9 performs dimming in the direction of increasing the current of the light source 8 from the lighting state with the delay time Tdelay2 (S21), and when the dimming rate is equal to or less than the threshold 1 (S22, No), The delay time is not changed (S25). If the dimming rate is larger than the threshold value 1 (S22, Yes), the delay time is not changed (S25) if the delay time maintenance time Tk has not passed after the final change of the delay time (S23, No). When the delay time maintaining time Tk has elapsed after the final change of the delay time (S23, Yes), the control unit 9 does not change the delay time if the delay time is equal to or less than Tdelay1 (S24, No) ( S25). If the delay time is larger than Tdelay1 (S24, Yes), the delay time is shortened by Tstep (S26).
  • the light source 8 was comprised by LED
  • LED Organic EL (Electro Luminescence) may be sufficient.
  • FIG. FIG. 14 is a configuration diagram of a lighting device and a lighting fixture according to the second embodiment.
  • the difference between the lighting fixture 200A according to Embodiment 2 and the lighting fixture 200 according to Embodiment 1 is that the lighting fixture 100A is used instead of the lighting device 100 in the lighting fixture 200A.
  • the difference between the lighting device 100A according to the second embodiment and the lighting device 100 according to the first embodiment is that, in the lighting device 100A, a DC conversion circuit is used instead of the PFC circuit 5, the smoothing capacitor 6, and the current control unit 7. 12, and a control unit 9 ⁇ / b> A is used instead of the control unit 9.
  • the DC conversion circuit 12 is a circuit having the functions of the PFC circuit 5, the smoothing capacitor 6, and the current control unit 7.
  • Embodiment 2 describes an example in which the DC conversion circuit 12 is configured by a flyback circuit.
  • the DC conversion circuit 12 may be configured by a circuit such as a fly forward circuit, a step-down chopper, a step-up chopper, a step-up / step-down chopper circuit, a SEPIC, a Zeta converter, or a Cuk converter.
  • the DC conversion circuit 12 includes a MOSFET 121, a transformer 122, a diode 123, a smoothing capacitor 124, a snubber capacitor 125, a snubber resistor 126, and a snubber diode 127.
  • the MOSFET 121 is disposed between the capacitor 4 and the primary side of the transformer 122 in the negative-side DC bus N.
  • the source of the MOSFET 121 is connected to one end of the capacitor 4 and the rectifier circuit 3.
  • the drain of MOSFET 121 is connected to the anode of snubber diode 127 and transformer 122.
  • Snubber capacitor 125, snubber resistor 126 and snubber diode 127 are arranged between capacitor 4 and the primary side of transformer 122.
  • One end of the snubber resistor 126 is connected to the other end of the capacitor 4, the rectifier circuit 3, one end of the snubber capacitor 125, and the transformer 122 via the positive side DC bus P.
  • the other end of the snubber resistor 126 is connected to the other end of the snubber capacitor 125 and one end of the snubber diode 127.
  • the other end of the snubber capacitor 125 is connected to the other end of the snubber resistor 126 and one end of the snubber diode 127.
  • the diode 123 and the smoothing capacitor 124 are disposed between the secondary side of the transformer 122 and the light source 8.
  • the anode of the diode 123 is connected to the transformer 122, and the cathode of the diode 123 is connected to one end of the smoothing capacitor 124 and one end of the light source 8.
  • the other end of the smoothing capacitor 124 is connected to the transformer 122 and the other end of the light source 8.
  • the primary winding 122a, the secondary winding 122b, and the tertiary winding 122c are formed in the transformer 122 by winding an insulating wire around a core (not shown).
  • the direct current conversion circuit 12 converts the output voltage of the rectifier circuit 3 and outputs a direct current to the light source 8 when the MOSFET 121 is on / off controlled.
  • the control unit 9A includes a target value output unit 91, a zero current detection unit 92, a switching control unit 93A, and a current input unit 94.
  • the difference between the control unit 9 shown in FIG. 1 and the control unit 9A shown in FIG. 14 is that, in the control unit 9A, the voltage detection unit 95 is omitted, and the switching control unit 93A is used instead of the switching control unit 93. That is.
  • FIG. 15 is a timing chart showing the relationship between the current flowing through the windings constituting the DC conversion circuit shown in FIG. 14, the drain voltage of the MOSFET, and the gate voltage of the MOSFET.
  • the current of the AC power source 1 input to the lighting device 100A the current flowing through the primary winding 122a, the current flowing through the tertiary winding 122c, the drain voltage of the MOSFET 121, and the MOSFET 121
  • the gate voltage is shown.
  • the horizontal axis represents time.
  • the current of the AC power supply 1 input to the lighting device 100 ⁇ / b> A is indicated as “input current”.
  • the cycle in which the gate voltage of the MOSFET 121 is turned on / off is shown to be longer than the actual period.
  • the period during which the gate voltage of the MOSFET 121 is turned on / off is equal to the time from when the gate voltage of the MOSFET 121 changes from off to on until when the gate voltage of the MOSFET 121 changes from off to on again.
  • the MOSFET 121 When the ON time set in the switching control unit 93A elapses, the MOSFET 121 is turned off to form a closed circuit of the tertiary winding 122c, the diode 123, and the smoothing capacitor 124. In this closed circuit, the energy stored in the primary winding 122a is released, and the smoothing capacitor 124 is charged.
  • the MOSFET 121 is kept off until the delay time Tdelay elapses after the current flowing through the tertiary winding 122c becomes zero, and the MOSFET 121 is turned on again when the delay time Tdelay elapses.
  • the current flowing through the primary winding 122a has a triangular waveform, and a sine wave envelope whose apex is indicated by a dotted line.
  • the current input from the AC power source 1 is smoothed by the input filter 2, and the average value of the coil current flowing through the coil 21 is input to form a sine wave current waveform.
  • the control unit 9A detects the current flowing through the light source 8, and feedback control is performed so that the detected current follows the target value, whereby the on-time of the MOSFET 121 is controlled.
  • the response time of the feedback control is set so that the loop gain of the feedback control is not less than 1/2 of one cycle of the AC power supply 1 and not more than 1 (0 dB). In other words, the response time of the feedback control is set to be 1 (0 dB) or less at a frequency that is 2 times or less of the frequency of the AC power supply 1.
  • the loop gain of the constant current feedback control is set to be 1 (0 dB) or less at a frequency of 100 Hz or less of a half cycle (half wave) of the power supply frequency, that is, a cycle of 10 msec or more.
  • the constant current feedback control is set so as not to respond in a cycle shorter than 1 ⁇ 2 of the power cycle.
  • the fluctuation of the on-time of the MOSFET 121 is suppressed within a half cycle of the power supply cycle, and the envelope of the peak of the current flowing through the primary winding 122a becomes a sine wave waveform.
  • the same effect can be obtained by setting the on-time update cycle to a cycle corresponding to half the cycle of the AC power supply 1 or a cycle longer than the cycle corresponding to half the cycle of the AC power supply 1.
  • the lighting device 100A and the lighting fixture 200A according to the second embodiment are provided with the delay time Tdelay as in the first embodiment, and when the current critical mode control is performed by switching the MOSFET 121 by the current discontinuous mode control. In comparison, since the switching frequency can be lowered, the switching loss generated in the MOSFET 121 can be reduced.
  • the length of the delay time is an output that the DC conversion circuit 30 outputs to the LED instead of the dimming rate.
  • the determination may be made based on the current target value.
  • the magnitude of the output of the DC conversion circuit may be determined by the dimming rate of the LED, may be determined by the output current target value of the LED, or may be determined by the dimming rate of the organic EL. It may be determined.
  • the magnitude of the output of the DC conversion circuit may be determined from the output current target value of the LED.
  • you may comprise the control part which concerns on Embodiment 1, 2 so that the length of delay time may be changed according to an output current target value instead of a light control rate.
  • the configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

Un dispositif d'éclairage (100) selon la présente invention comprend : un circuit de redressement (3) qui redresse une puissance en c.a. ; un circuit de conversion en c.c. (30) qui inhibe des harmoniques supérieures d'un courant et améliore le facteur de puissance, et convertit la puissance délivrée en sortie à partir du circuit de redressement (3) en une puissance en c.c., et fournit la puissance en c.c. à une source de lumière ; et une unité de commande (9) qui commande le circuit de conversion en c.c. (30). Le circuit de conversion en c.c. (30) comprend : un condensateur de lissage (6) ; un MOSFET (51) qui est disposé entre le condensateur de lissage (6) et le circuit de redressement (3) ; et une bobine (52) à travers laquelle circule le courant délivré en sortie à partir du circuit de redressement (3). L'unité de commande (9) règle le MOSFET (51) dans un état hors tension à partir du moment où le courant circulant à travers la bobine (52) devient nul, jusqu'à écoulement d'un temps de retard réglé dans l'unité de commande (9), et met sous tension le MOSFET (51) lorsque le temps de retard s'est écoulé.
PCT/JP2016/089196 2016-12-28 2016-12-28 Dispositif d'éclairage et appareil d'éclairage WO2018123056A1 (fr)

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PCT/JP2016/089196 WO2018123056A1 (fr) 2016-12-28 2016-12-28 Dispositif d'éclairage et appareil d'éclairage
JP2018558794A JP6694078B2 (ja) 2016-12-28 2017-07-11 点灯装置及び照明器具
PCT/JP2017/025307 WO2018123115A1 (fr) 2016-12-28 2017-07-11 Dispositif d'éclairage et appareil d'illumination
JP2020073450A JP2020109775A (ja) 2016-12-28 2020-04-16 点灯装置及び照明器具

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JP7293923B2 (ja) * 2019-07-08 2023-06-20 三菱電機株式会社 光源点灯装置、照明器具、光源点灯装置の制御方法
JP2021068599A (ja) * 2019-10-24 2021-04-30 三菱電機株式会社 照明システム

Citations (4)

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WO2011030640A1 (fr) * 2009-09-11 2011-03-17 株式会社村田製作所 Convertisseur pfc
JP2012175868A (ja) * 2011-02-23 2012-09-10 Fuji Electric Co Ltd Ｄｃ−ｄｃコンバータの制御装置
JP2016119830A (ja) * 2014-12-22 2016-06-30 三菱電機株式会社 光源点灯装置及び照明器具
JP2016181975A (ja) * 2015-03-24 2016-10-13 新日本無線株式会社 スイッチング電源装置

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JP6070189B2 (ja) * 2012-12-30 2017-02-01 富士電機株式会社 スイッチング電源装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011030640A1 (fr) * 2009-09-11 2011-03-17 株式会社村田製作所 Convertisseur pfc
JP2012175868A (ja) * 2011-02-23 2012-09-10 Fuji Electric Co Ltd Ｄｃ−ｄｃコンバータの制御装置
JP2016119830A (ja) * 2014-12-22 2016-06-30 三菱電機株式会社 光源点灯装置及び照明器具
JP2016181975A (ja) * 2015-03-24 2016-10-13 新日本無線株式会社 スイッチング電源装置

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