JP2015060700A - Dimmer and lighting device - Google Patents

Dimmer and lighting device Download PDF

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JP2015060700A
JP2015060700A JP2013193246A JP2013193246A JP2015060700A JP 2015060700 A JP2015060700 A JP 2015060700A JP 2013193246 A JP2013193246 A JP 2013193246A JP 2013193246 A JP2013193246 A JP 2013193246A JP 2015060700 A JP2015060700 A JP 2015060700A
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trigger signal
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JP6191956B2 (en
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村上　善宣
Yoshinobu Murakami
善宣 村上
光治 中川原
Mitsuharu Nakagawara
光治 中川原
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Panasonic Corp
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Abstract

PROBLEM TO BE SOLVED: To suppress occurrence of flicker of a light source just after instantaneous power failure.SOLUTION: A controller 22 does not output trigger signals (TG3 and TG4 in Figure 1) immediately after a synchronization interval is determined to be converged within a reference range, but outputs trigger signals (TG5 and TG6 in Figure 1) corresponding to a next synchronization signal. When a trigger signal is output just after the synchronization interval is determined to be converted within the reference range, there is a probability that the synchronization signal is deviated depending on occurrence timing of the instantaneous power failure and thus flicker occurs in the light source. On the other hand, the controller 22 according to this embodiment does not output trigger signals TG3, TG4 immediately after the synchronization interval is determined to be converged within the reference range, but outputs the trigger signals TG5, TG6 corresponding to the next synchronization signal. As a result, this embodiment can suppress occurrence of flicker of a light source 10 immediately after instantaneous power failure as compared with a prior art described in Patent Document 1.

Description

本発明は、調光器、及びその調光器と照明器具からなる照明装置に関する。   The present invention relates to a dimmer and a lighting device including the dimmer and a lighting fixture.

従来例として、特許文献１に記載されている位相制御式の調光器を例示する。位相制御式の調光器は、双方向に電流を流す自己保持型の半導体スイッチング素子、例えば、双方向３端子サイリスタ(トライアック)をターンオンするタイミングを調整し、交流電源から照明器具に印加される交流電圧(電源電圧)の導通期間(位相)を制御する。   As a conventional example, a phase control type dimmer described in Patent Document 1 is illustrated. The phase control type dimmer adjusts the timing of turning on a self-holding semiconductor switching element that flows current in both directions, for example, a bidirectional three-terminal thyristor (triac), and is applied from an AC power source to a lighting fixture. Controls the conduction period (phase) of AC voltage (power supply voltage).

照明器具の光源が白熱ランプの場合、調光器で位相制御された電源電圧が印加されることで白熱ランプを直接調光することができる。また、照明器具の光源が蛍光ランプやＬＥＤ光源の場合、照明器具に搭載される点灯装置が、位相制御された電源電圧の導通期間から調光レベルを読み取り、読み取った調光レベルに対応して光源を調光する。   When the light source of a lighting fixture is an incandescent lamp, the incandescent lamp can be dimmed directly by applying a power supply voltage phase-controlled by a dimmer. In addition, when the light source of the lighting fixture is a fluorescent lamp or LED light source, the lighting device mounted on the lighting fixture reads the dimming level from the conduction period of the phase-controlled power supply voltage, and corresponds to the read dimming level. Dimming the light source.

また、特許文献１記載の従来例では、導通期間中にトライアックのゲート端子にトリガ信号を印加し続ける、いわゆるＤＣトリガ方式が採用されている。つまり、ＤＣトリガ方式の調光器は、電源電圧が所定のしきい値を超えているときにハイレベルとなる同期信号を生成し、同期信号の立ち上がりを起点として導通期間を決定し、当該導通期間内にトリガ信号を出力するように構成されている。   The conventional example described in Patent Document 1 employs a so-called DC trigger method in which a trigger signal is continuously applied to the gate terminal of the triac during the conduction period. In other words, the DC trigger type dimmer generates a synchronization signal that becomes a high level when the power supply voltage exceeds a predetermined threshold, determines the conduction period from the rising edge of the synchronization signal, and determines the conduction A trigger signal is output within the period.

ところで、ＤＣトリガ方式の調光器では、交流電源に概ね１秒未満の瞬間的な停電(瞬時停電)が生じた場合に同期信号の立ち上がりが正常時からずれてしまうため、任意の調光レベルに対するトリガ信号の出力期間が正常時と異なってしまうことがある。そして、正常時と異なるトリガ信号の出力期間が電源電圧のゼロクロスを跨いでいると、トリガ信号の出力を停止しても、次のゼロクロスまでトライアックがオンし続けてしまい、光源の光量が大きく変動してちらつきが生じる虞がある。   By the way, in the case of the DC trigger type dimmer, when the instantaneous power failure (instantaneous power failure) of less than 1 second occurs in the AC power supply, the rising edge of the synchronization signal deviates from the normal time. The trigger signal output period may differ from the normal time. And if the trigger signal output period different from the normal time crosses the zero cross of the power supply voltage, even if the trigger signal output stops, the triac keeps on until the next zero cross, and the light quantity of the light source fluctuates greatly As a result, flicker may occur.

そこで、特許文献１記載の従来例では、同期信号の立ち上がりの間隔を計測し、当該間隔が基準範囲(電源電圧の１周期にほぼ等しい範囲)から外れた場合にトリガ信号の出力を停止することで光源のちらつきを抑制している。また、特許文献１記載の従来例は、前記間隔が基準範囲から外れた後も当該間隔を計測し、前記間隔が基準範囲内に収まれば、トリガ信号の出力を直ちに再開するように構成されている。   Therefore, in the conventional example described in Patent Document 1, the rising interval of the synchronization signal is measured, and the trigger signal output is stopped when the interval deviates from the reference range (a range approximately equal to one cycle of the power supply voltage). To suppress flickering of the light source. In addition, the conventional example described in Patent Document 1 is configured to measure the interval even after the interval deviates from the reference range, and immediately restart the output of the trigger signal when the interval falls within the reference range. Yes.

特開２０１３−２０８３９号公報JP 2013-20839 A

しかしながら、瞬時停電が発生するタイミングによっては、前記間隔が基準範囲内に収まった直後においても同期信号がずれてしまい、光源にちらつきが発生する可能性がある。   However, depending on the timing at which an instantaneous power failure occurs, the synchronization signal may shift even immediately after the interval falls within the reference range, and the light source may flicker.

本発明は、上記課題に鑑みて為されたものであり、瞬時停電直後における光源のちらつき発生を抑制することを目的とする。   The present invention has been made in view of the above problems, and an object thereof is to suppress the occurrence of flickering of a light source immediately after an instantaneous power failure.

本発明の調光器は、正弦波の交流電圧を出力する電源の出力端間に照明器具と直列接続されるスイッチング素子と、前記交流電圧が所定のしきい値を超えている期間を検出し、前記期間と同期した同期信号を出力する同期信号出力部と、前記同期信号の立ち上がりを起点として前記スイッチング素子をオンさせる期間を決定し、且つ前記オン期間に前記スイッチング素子をオンさせるためのトリガ信号を出力する制御部とを備え、前記制御部は、前記同期信号の立ち上がりの間隔が所定の基準範囲内に収まるか否かを判定し、前記間隔が前記基準範囲内に収まると判定したときに前記トリガ信号を出力し、前記間隔が前記基準範囲を外れると判定したときに前記トリガ信号の出力を停止し、さらに、前記トリガ信号の出力停止後に前記間隔が前記基準範囲内に収まると判定した場合、前記判定直後の少なくとも１周期目の前記同期信号に対しては前記トリガ信号を出力せず、前記判定直後の２周期目以降の前記同期信号に対して前記トリガ信号を出力するように構成されることを特徴とする。   The dimmer of the present invention detects a switching element connected in series with a lighting fixture between output terminals of a power source that outputs a sinusoidal AC voltage, and a period during which the AC voltage exceeds a predetermined threshold. A synchronization signal output unit for outputting a synchronization signal synchronized with the period; a trigger for determining a period for turning on the switching element from a rising edge of the synchronization signal; and for turning on the switching element in the on period A control unit that outputs a signal, and the control unit determines whether or not a rising interval of the synchronization signal falls within a predetermined reference range, and determines that the interval falls within the reference range The trigger signal is output, and the output of the trigger signal is stopped when it is determined that the interval is out of the reference range. Further, the output of the trigger signal is stopped after the output of the trigger signal is stopped. If it is determined that it falls within the reference range, the trigger signal is not output for the synchronization signal in at least the first cycle immediately after the determination, and for the synchronization signal in the second and subsequent cycles immediately after the determination. It is configured to output the trigger signal.

この調光器において、前記制御部は、前記トリガ信号の出力停止後に前記間隔が前記基準範囲内に収まると判定した回数が２以上の所定回数に達した場合に前記トリガ信号の出力を再開するように構成されることが好ましい。   In this dimmer, the control unit resumes the output of the trigger signal when the number of times that the interval is determined to be within the reference range after the output of the trigger signal is stopped reaches a predetermined number of 2 or more. It is preferable to be configured as described above.

本発明の調光器は、正弦波の交流電圧を出力する電源の出力端間に照明器具と直列接続されるスイッチング素子と、前記交流電圧が所定のしきい値を超えている期間を検出し、前記期間と同期した同期信号を出力する同期信号出力部と、前記同期信号の立ち上がりを起点として前記スイッチング素子をオンさせる期間を決定し、且つ前記オン期間に前記スイッチング素子をオンさせるためのトリガ信号を出力する制御部とを備え、前記制御部は、前記同期信号の立ち上がりの間隔が所定の基準範囲内に収まるか否かを判定し、前記間隔が前記基準範囲内に収まると判定したときに前記トリガ信号を出力し、前記間隔が前記基準範囲を外れると判定した場合、前記判定直後の１周期目の前記同期信号に対しては前記トリガ信号を出力せず、前記判定直後の２周期目以降の前記同期信号に対して前記トリガ信号を出力するように構成されることを特徴とする。   The dimmer of the present invention detects a switching element connected in series with a lighting fixture between output terminals of a power source that outputs a sinusoidal AC voltage, and a period during which the AC voltage exceeds a predetermined threshold. A synchronization signal output unit for outputting a synchronization signal synchronized with the period; a trigger for determining a period for turning on the switching element from a rising edge of the synchronization signal; and for turning on the switching element in the on period A control unit that outputs a signal, and the control unit determines whether or not a rising interval of the synchronization signal falls within a predetermined reference range, and determines that the interval falls within the reference range When the trigger signal is output and the interval is determined to be out of the reference range, the trigger signal is not output for the synchronization signal in the first cycle immediately after the determination, Characterized in that it is configured to output the trigger signal to the synchronization signal 2 and subsequent cycles of the constant immediately.

本発明の照明装置は、前記何れかの調光器と、前記調光器とともに前記電源の出力端間に直列接続される照明器具とを有することを特徴とする。   The illuminating device of the present invention includes any one of the dimmers and a luminaire connected in series between output terminals of the power source together with the dimmer.

この照明装置において、前記照明器具は、光源として固体発光素子を備えることが好ましい。   In this illuminating device, the luminaire preferably includes a solid light emitting element as a light source.

本発明の調光器及び照明装置は、瞬時停電直後における光源のちらつき発生を抑制することができるという効果がある。   The dimmer and the lighting device of the present invention have an effect that the occurrence of flickering of the light source immediately after the instantaneous power failure can be suppressed.

本発明に係る調光器の実施形態の動作を説明するためのタイムチャートである。It is a time chart for demonstrating operation | movement of embodiment of the light control device which concerns on this invention. 本発明に係る照明装置の実施形態を示す構成図、並びに調光器の実施形態を示す回路構成図である。It is the block diagram which shows embodiment of the illuminating device which concerns on this invention, and the circuit block diagram which shows embodiment of a light controller. 同上における照明器具の回路構成図である。It is a circuit block diagram of the lighting fixture in the same as the above. 本発明に係る調光器の他の実施形態の動作を説明するためのタイムチャートである。It is a time chart for demonstrating operation | movement of other embodiment of the light controller which concerns on this invention.

以下、本発明に係る調光器、及びその調光器と照明器具とを有する照明装置の実施形態について、図面を参照して詳細に説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a dimmer according to the present invention and a lighting device including the dimmer and a lighting fixture will be described in detail with reference to the drawings.

本実施形態の調光器２は、特許文献１記載の従来例と同じくＤＣトリガ方式の調光器である。また、本実施形態の照明装置は、図２に示すように調光器２と、調光器２とともに交流電源３の出力端間に直列接続される照明器具１とで構成される。   The dimmer 2 of the present embodiment is a DC trigger type dimmer similar to the conventional example described in Patent Document 1. Moreover, the illuminating device of this embodiment is comprised with the dimmer 2 and the lighting fixture 1 connected in series between the output terminals of AC power supply 3 with the dimmer 2 as shown in FIG.

照明器具１は、図３に示すように光源10と、スイッチ11と、整流回路12と、平滑回路13と、分圧回路14と、調光制御部15とを備える。   As illustrated in FIG. 3, the lighting fixture 1 includes a light source 10, a switch 11, a rectifier circuit 12, a smoothing circuit 13, a voltage dividing circuit 14, and a dimming control unit 15.

光源10は、複数個(図示例では２個)の固体発光素子(例えば、発光ダイオード100)と限流抵抗R1の直列回路で構成される。スイッチ11は電界効果トランジスタであり、ドレインが光源10に接続され、ソースが整流回路12の低電位側の出力端に接続される。   The light source 10 includes a series circuit of a plurality (two in the illustrated example) of solid-state light emitting elements (for example, the light emitting diode 100) and a current limiting resistor R1. The switch 11 is a field effect transistor having a drain connected to the light source 10 and a source connected to the output terminal on the low potential side of the rectifier circuit 12.

整流回路12はダイオードブリッジで構成され、一方の入力端が交流電源３の正極に接続され、他方の入力端が調光器２に接続される。平滑回路13は、ダイオードD1と平滑コンデンサC1で構成される。ダイオードD1は、整流回路12の高電位側の出力端にアノードが接続され、光源10の一端にカソードが接続される。また、平滑コンデンサC1は、高電位側の端子がダイオードD1のカソードに接続され、低電位側の端子が整流回路12の低電位側の出力端に接続される。   The rectifier circuit 12 is configured by a diode bridge, and one input terminal is connected to the positive electrode of the AC power source 3 and the other input terminal is connected to the dimmer 2. The smoothing circuit 13 includes a diode D1 and a smoothing capacitor C1. The diode D1 has an anode connected to the output terminal on the high potential side of the rectifier circuit 12, and a cathode connected to one end of the light source 10. The smoothing capacitor C1 has a high-potential side terminal connected to the cathode of the diode D1, and a low-potential side terminal connected to the low-potential side output terminal of the rectifier circuit 12.

分圧回路14は、２つの分圧抵抗R2，R3の直列回路からなり、整流回路12の出力端間に接続される。そして、分圧回路14は、整流回路12で全波整流された交流電源３の電源電圧(脈流電圧)を分圧抵抗R2、R3の抵抗比(分圧比)で分圧した電圧(以下、検出電圧と呼ぶ。)を調光制御部15に出力する。なお、検出電圧は、調光器２によって位相制御されている。   The voltage dividing circuit 14 includes a series circuit of two voltage dividing resistors R2 and R3, and is connected between the output terminals of the rectifier circuit 12. The voltage dividing circuit 14 then divides the power supply voltage (pulsating voltage) of the AC power supply 3 that has been full-wave rectified by the rectifying circuit 12 by the resistance ratio (voltage dividing ratio) of the voltage dividing resistors R2 and R3 (hereinafter referred to as the voltage dividing ratio). (Referred to as a detection voltage) is output to the dimming controller 15. The detected voltage is phase-controlled by the dimmer 2.

調光制御部15は、検出電圧を基準電圧と比較することで方形波のパルス信号に変換し、当該パルス信号をスイッチ11のゲート端子に出力することでスイッチ11をオンさせる。つまり、スイッチ11がオンしているときにのみ光源10に電流が流れるので、調光制御部15は、位相制御された検出電圧のオンデューティ比に対応して、単位時間当たりに供給する電力を増減して光源10を調光することができる。   The dimming control unit 15 converts the detection voltage into a square-wave pulse signal by comparing it with a reference voltage, and outputs the pulse signal to the gate terminal of the switch 11 to turn on the switch 11. That is, since the current flows through the light source 10 only when the switch 11 is on, the dimming control unit 15 uses the power supplied per unit time corresponding to the on-duty ratio of the phase-controlled detection voltage. The light source 10 can be dimmed by increasing or decreasing.

一方、調光器２は、図２に示すようにスイッチング素子Q1、電源回路20、同期信号出力部21、制御部22、一対の接続端子23，24などを備え、一方の接続端子23に照明器具１の一端が接続され、他方の接続端子24に交流電源３の負極が接続される。   On the other hand, as shown in FIG. 2, the dimmer 2 includes a switching element Q1, a power supply circuit 20, a synchronization signal output unit 21, a control unit 22, a pair of connection terminals 23 and 24, and the like. One end of the instrument 1 is connected, and the negative terminal of the AC power source 3 is connected to the other connection terminal 24.

接続端子23，24には雑音防止用のフィルタを介してスイッチング素子Q1が接続されている。このフィルタは、接続端子23，24間に接続されるコンデンサC2と、コンデンサC2の一端とスイッチング素子Q1との間に接続されるインダクタL1とで構成される。   A switching element Q1 is connected to the connection terminals 23 and 24 through a noise prevention filter. This filter includes a capacitor C2 connected between the connection terminals 23 and 24, and an inductor L1 connected between one end of the capacitor C2 and the switching element Q1.

スイッチング素子Q1は、自己保持型の半導体スイッチング素子、例えば、双方向３端子サイリスタ(トライアック)からなり、一端が接続端子23に接続され、他端がインダクタL1を介して接続端子24と接続される。また、スイッチング素子Q1のゲート端子は、ｎｐｎ型のバイポーラトランジスタからなるスイッチ素子Q2のコレクタに接続されている。このスイッチ素子Q2は、エミッタがグランドに接続され、ベースが制御部22に接続されている。   The switching element Q1 is a self-holding semiconductor switching element, for example, a bidirectional three-terminal thyristor (triac), and one end is connected to the connection terminal 23 and the other end is connected to the connection terminal 24 via the inductor L1. . The gate terminal of the switching element Q1 is connected to the collector of the switching element Q2 made of an npn-type bipolar transistor. The switch element Q2 has an emitter connected to the ground and a base connected to the control unit 22.

電源回路20は、スイッチング素子と当該スイッチング素子をスイッチング制御する制御回路とが集積化された集積回路であり、ダイオードD2で半波整流され且つ平滑コンデンサC3で平滑された入力電圧(直流電圧)を所望の定電圧に安定化して出力する。   The power supply circuit 20 is an integrated circuit in which a switching element and a control circuit that controls switching of the switching element are integrated, and an input voltage (DC voltage) that has been half-wave rectified by a diode D2 and smoothed by a smoothing capacitor C3. The output is stabilized to a desired constant voltage.

電源回路20の出力端に、インダクタL2、コンデンサC4、ダイオードD4が接続され、前記集積回路のスイッチング素子、インダクタL2、コンデンサC4、ダイオードD4で昇降圧チョッパ回路が構成される。インダクタL2は、一端が電源回路20の出力端と接続され、他端が電解コンデンサからなるコンデンサC4の高電位側の端子に接続される。このコンデンサC4は、高電位側の端子が平滑コンデンサC3の低電位側の端子に接続され、低電位側の端子がグランドに接続されている。また、ダイオードD4は、アノードがグランドに接続され、カソードが電源回路20の出力端子接続されている。つまり、この昇降圧チョッパ回路は、インダクタL2を介してコンデンサC4を充電し、コンデンサC4の充電電圧を動作電圧(制御電圧)として制御部22に供給している。   An inductor L2, a capacitor C4, and a diode D4 are connected to the output terminal of the power supply circuit 20, and a step-up / step-down chopper circuit is configured by the switching element, the inductor L2, the capacitor C4, and the diode D4 of the integrated circuit. Inductor L2 has one end connected to the output end of power supply circuit 20, and the other end connected to the high potential side terminal of capacitor C4 made of an electrolytic capacitor. The capacitor C4 has a high potential side terminal connected to the low potential side terminal of the smoothing capacitor C3 and a low potential side terminal connected to the ground. The diode D4 has an anode connected to the ground and a cathode connected to the output terminal of the power supply circuit 20. That is, the step-up / step-down chopper circuit charges the capacitor C4 through the inductor L2, and supplies the charging voltage of the capacitor C4 to the control unit 22 as an operating voltage (control voltage).

同期信号出力部21には、接続端子23，24間に印加される電源電圧(交流電圧)がダイオードD5で半波整流されて入力される。そして、同期信号出力部21は、入力電圧(半波整流された電源電圧)を所定のしきい値Vfと比較し、入力電圧がしきい値Vfを上回っているときにハイレベルとなり、入力電圧がしきい値Vfを下回っているときにローレベルとなる同期信号を生成する(図１参照)。なお、同期信号出力部21は、ダイオードD5で半波整流された電源電圧が入力されるので、交流電源３の電源電圧の周期(以下、電源周期と呼ぶ。)の正の半周期毎に１回ずつ同期信号を生成して制御部22へ出力している。   A power supply voltage (AC voltage) applied between the connection terminals 23 and 24 is input to the synchronization signal output unit 21 after being half-wave rectified by the diode D5. The synchronization signal output unit 21 compares the input voltage (half-wave rectified power supply voltage) with a predetermined threshold value Vf, and becomes high level when the input voltage exceeds the threshold value Vf. A synchronization signal that is at a low level is generated when is below the threshold value Vf (see FIG. 1). Since the power supply voltage half-wave rectified by the diode D5 is input to the synchronization signal output unit 21, 1 is provided for every positive half cycle of the cycle of the power supply voltage of the AC power supply 3 (hereinafter referred to as the power supply cycle). A synchronization signal is generated and output to the control unit 22 each time.

図示は省略しているが、制御部22にはポテンショメータで分圧された電圧が入力される。このポテンショメータは、例えばダイヤル式の操作つまみの回転に対応してしゅう動接点がしゅう動するように構成されている。つまり、制御部22に入力される前記電圧は、ポテンショメータが操作つまみの操作位置に対応した分圧比で分圧した電圧となる。したがって、制御部22は、前記電圧から操作つまみの操作位置、すなわち、調光レベルを読み取ることができる。そして、制御部22は、読み取った調光レベルと、同期信号出力部21から出力される同期信号に基づいて、スイッチング素子Q1をオンするためのトリガ信号を生成する。   Although not shown, the voltage divided by the potentiometer is input to the control unit 22. This potentiometer is configured such that the sliding contact slides in response to, for example, rotation of a dial type operation knob. That is, the voltage input to the control unit 22 is a voltage that is divided by the potentiometer at a voltage dividing ratio corresponding to the operation position of the operation knob. Therefore, the control unit 22 can read the operation position of the operation knob, that is, the dimming level from the voltage. Then, the control unit 22 generates a trigger signal for turning on the switching element Q1 based on the read dimming level and the synchronization signal output from the synchronization signal output unit 21.

すなわち、制御部22は、同期信号の立ち上がりを起点としてスイッチング素子Q1をオンさせる期間(オン期間)を決定し、且つオン期間にハイレベルとなる方形波のトリガ信号を生成してスイッチ素子Q2のベースに出力する。スイッチ素子Q2は、トリガ信号が出力されているときにオンする。スイッチ素子Q2がオンすると、スイッチング素子Q1のゲート端子がコンデンサC4の充電電圧によって負電位にバイアスされるため、スイッチング素子Q1がオンする。そして、制御部22がトリガ信号を停止すれば、スイッチ素子Q2がオフとなり、スイッチング素子Q1のゲート端子が負電位にバイアスされなくなる。しかしながら、スイッチング素子Q1は、一定以上の保持電流が流れている間は導通状態を維持するため、トリガ信号の停止(立ち下がり)後も暫くは照明器具１に交流電源３の電源電圧が印加され続ける。そして、交流電源３の電源電圧がゼロクロスすると、スイッチング素子Q1を流れる保持電流が一定以下となり、スイッチング素子Q1がオフする。   That is, the control unit 22 determines a period (on period) during which the switching element Q1 is turned on starting from the rising edge of the synchronization signal, and generates a square-wave trigger signal that becomes a high level during the on period, thereby generating the switching element Q2. Output to base. The switch element Q2 is turned on when the trigger signal is output. When the switching element Q2 is turned on, the switching element Q1 is turned on because the gate terminal of the switching element Q1 is biased to a negative potential by the charging voltage of the capacitor C4. When the control unit 22 stops the trigger signal, the switch element Q2 is turned off, and the gate terminal of the switching element Q1 is not biased to a negative potential. However, since the switching element Q1 maintains a conductive state while a holding current exceeding a certain level flows, the power supply voltage of the AC power supply 3 is applied to the lighting fixture 1 for a while after the trigger signal is stopped (falling). to continue. When the power supply voltage of the AC power supply 3 crosses zero, the holding current flowing through the switching element Q1 becomes below a certain level, and the switching element Q1 is turned off.

ここで、前記オン期間は、同期信号の立ち上がりからトリガ信号の立ち上がりまでの時間(遅延時間)によって変化する。故に、制御部22は、調光レベルが高い(光源10の光量が多い)ほど前記遅延時間を短くしてオン期間を長くするように構成される。また、制御部22は、電源電圧の半周期に１回の割合でスイッチング素子Q1をオンさせるため、オン期間に対応した２つの遅延時間T1，T1+(1/2)×T0(T0は電源周期)毎にトリガ信号を出力する(図１参照)。つまり、制御部22は、電源周期T0毎に、１つの同期信号から２つのトリガ信号を生成して出力するように構成されている。   Here, the ON period varies depending on the time (delay time) from the rising edge of the synchronization signal to the rising edge of the trigger signal. Therefore, the control unit 22 is configured to shorten the delay time and extend the ON period as the dimming level is higher (the light amount of the light source 10 is larger). In addition, since the control unit 22 turns on the switching element Q1 once every half cycle of the power supply voltage, two delay times T1, T1 + (1/2) × T0 (T0 is a power cycle) corresponding to the ON period. ) A trigger signal is output every time (see FIG. 1). That is, the control unit 22 is configured to generate and output two trigger signals from one synchronization signal for each power cycle T0.

また、制御部22は、同期信号出力部21から出力される同期信号の立ち上がりの間隔を監視している。同期信号の立ち上がりの間隔とは、前回の同期信号の立ち上がりから今回の同期信号の立ち上がりまでに要する時間である。瞬時停電などの異常が発生しなければ、同期信号の立ち上がりの間隔(以下、同期間隔と呼ぶ。)は、電源周期T0に一致するはずである。したがって、制御部22は、同期間隔がT0±ΔT0の範囲(基準範囲)内に収まるか否かを判定し、収まると判定した場合、同期信号の立ち上がりを起点として遅延時間T1，T1+(1/2)×T0毎にトリガ信号を出力する。また、制御部22は、同期間隔が基準範囲内に収まらなかったと判定した場合、トリガ信号の生成及び出力を停止する。なお、電源周波数が50ヘルツの場合、電源周期T0は20ミリ秒となるから、20ミリ秒±0.8ミリ秒程度を基準範囲とすることが好ましい。   Further, the control unit 22 monitors the rising interval of the synchronization signal output from the synchronization signal output unit 21. The interval between rising edges of the synchronizing signal is the time required from the rising edge of the previous synchronizing signal to the rising edge of the current synchronizing signal. If an abnormality such as a momentary power failure does not occur, the synchronization signal rising interval (hereinafter referred to as the synchronization interval) should coincide with the power cycle T0. Therefore, the control unit 22 determines whether or not the synchronization interval falls within the range (reference range) of T0 ± ΔT0. If it is determined that the synchronization interval falls within the range, the delay time T1, T1 + (1 / 2) A trigger signal is output every × T0. If the control unit 22 determines that the synchronization interval does not fall within the reference range, the control unit 22 stops generating and outputting the trigger signal. When the power supply frequency is 50 Hz, the power supply period T0 is 20 milliseconds, so it is preferable that the reference range is about 20 milliseconds ± 0.8 milliseconds.

次に、本実施形態の調光器２の動作について、図１のタイムチャートを参照して詳細に説明する。同期信号出力部21は、接続端子23，24間に印加される電源電圧から同期信号を生成して制御部22に出力する。制御部22は、調光レベルに対応したオン期間(遅延時間T1，T1+(1/2)×T0)を決定してトリガ信号を出力する。また、制御部22は、トリガ信号の出力開始(立ち上がり)から、調光レベルに対応したオン期間が経過した時点でトリガ信号を停止する(立ち下げる)。トリガ信号が停止するとスイッチ素子Q2がオフするため、電源電圧がゼロクロスするとスイッチング素子Q1がオフする。したがって、スイッチング素子Q1は、トリガ信号が出力されている期間よりも若干長い期間(オン期間)だけオンとなり、このオン期間においてのみ、交流電源３から照明器具１に電源電圧が印加される。   Next, the operation of the dimmer 2 of this embodiment will be described in detail with reference to the time chart of FIG. The synchronization signal output unit 21 generates a synchronization signal from the power supply voltage applied between the connection terminals 23 and 24 and outputs it to the control unit 22. The control unit 22 determines an ON period (delay time T1, T1 + (1/2) × T0) corresponding to the dimming level and outputs a trigger signal. In addition, the control unit 22 stops (falls) the trigger signal when the ON period corresponding to the dimming level elapses from the start (rise) of the trigger signal output. Since the switching element Q2 is turned off when the trigger signal is stopped, the switching element Q1 is turned off when the power supply voltage is zero-crossed. Therefore, the switching element Q1 is turned on only for a period (on period) slightly longer than the period during which the trigger signal is output, and the power supply voltage is applied from the AC power source 3 to the lighting fixture 1 only during this on period.

照明器具１の調光制御部15は、調光器２で位相制御された電源電圧を分圧回路14で分圧した検出電圧を基準電圧と比較することにより、検出電圧が基準電圧を上回っているときにハイレベルとなる方形波のパルス信号を生成する。そして、このパルス信号がゲート端子に印加されることでスイッチ11がオンし、スイッチ11のオン期間が調光レベルに対応して伸縮されることにより、光源10が調光される。   The dimming control unit 15 of the luminaire 1 compares the detection voltage obtained by dividing the power supply voltage phase-controlled by the dimmer 2 by the voltage dividing circuit 14 with the reference voltage, so that the detection voltage exceeds the reference voltage. A square-wave pulse signal that is at a high level during generation is generated. Then, the switch 11 is turned on by applying this pulse signal to the gate terminal, and the light source 10 is dimmed by expanding and contracting the ON period of the switch 11 corresponding to the dimming level.

ここで、図１に示すように調光器２の接続端子23，24間に印加される電源電圧が極めて短い期間Txにゼロボルトになった、すなわち、瞬時停電が発生したと仮定する。瞬時停電が発生すると、同期信号出力部21は、本来のタイミングではなく、接続端子23、24間への電源電圧の印加が再開した(復電した)時点で同期信号を立ち上げる。したがって、瞬時停電が発生した後の同期間隔は、瞬時停電が発生する前(通常時)における同期間隔からずれてしまう。   Here, as shown in FIG. 1, it is assumed that the power supply voltage applied between the connection terminals 23 and 24 of the dimmer 2 becomes zero volts in a very short period Tx, that is, an instantaneous power failure occurs. When an instantaneous power failure occurs, the synchronization signal output unit 21 raises the synchronization signal when the application of the power supply voltage between the connection terminals 23 and 24 is resumed (recovered), not at the original timing. Therefore, the synchronization interval after the instantaneous power failure occurs is deviated from the synchronization interval before the instantaneous power failure occurs (normal time).

制御部22は、通常時の同期信号の立ち上がりを起点として基準範囲を繰り返し計時(カウント)している。したがって、上述のように瞬時停電が発生して同期信号の立ち上がりのタイミングが通常時からずれると、同期間隔が基準範囲(実際は基準範囲の整数倍)内に収まらない。制御部22は、同期間隔が基準範囲内に収まらないと判定した場合、その同期信号(復電した電源周期における同期信号)に対応したトリガ信号(図１に破線で示したTG1とTG2)の出力を停止する。トリガ信号が出力されないとスイッチング素子Q1がオンせず、照明器具１に電源電圧が印加されないために光源10が消灯する。   The control unit 22 repeatedly counts the reference range starting from the rising edge of the normal synchronization signal. Therefore, as described above, when an instantaneous power failure occurs and the rising timing of the synchronization signal deviates from the normal time, the synchronization interval does not fall within the reference range (actually an integer multiple of the reference range). When it is determined that the synchronization interval does not fall within the reference range, the control unit 22 generates a trigger signal (TG1 and TG2 indicated by a broken line in FIG. 1) corresponding to the synchronization signal (synchronization signal in the recovered power cycle). Stop output. If the trigger signal is not output, the switching element Q1 is not turned on, and the power source voltage is not applied to the luminaire 1, so the light source 10 is turned off.

そして、復電した電源周期の次の電源周期では、同期信号が通常のタイミングで立ち上がるので、制御部22は、同期間隔が基準範囲(基準範囲の整数倍)内に収まると判定する。しかしながら、制御部22は、同期間隔が基準範囲内に収まると判定しても直ちにトリガ信号(図１におけるTG3とTG4)を出力せず、その次の同期信号に対応したトリガ信号(図１におけるTG5とTG6)から出力する。そして、照明器具１は、位相制御された電源電圧が印加されると調光を再開する。   Then, in the power supply cycle next to the power supply cycle after the power recovery, the synchronization signal rises at a normal timing, so the control unit 22 determines that the synchronization interval falls within the reference range (an integer multiple of the reference range). However, the controller 22 does not immediately output the trigger signals (TG3 and TG4 in FIG. 1) even if it is determined that the synchronization interval falls within the reference range, and the trigger signal corresponding to the next synchronization signal (in FIG. 1). Output from TG5 and TG6). And the lighting fixture 1 restarts light control, if the power supply voltage by which phase control was applied.

而して、特許文献１記載の従来例のように、同期間隔が基準範囲内に収まったと判定された直後にトリガ信号を出力する場合、瞬時停電の発生タイミングによっては、同期信号がずれてしまい、光源にちらつきが発生する可能性がある。   Thus, as in the conventional example described in Patent Document 1, when the trigger signal is output immediately after it is determined that the synchronization interval is within the reference range, the synchronization signal is shifted depending on the occurrence timing of the instantaneous power failure. The flicker may occur in the light source.

これに対して本実施形態における制御部22は、同期間隔が基準範囲内に収まると判定しても直ちにトリガ信号TG3，TG4を出力せず、その次の同期信号に対応したトリガ信号TG5，TG6から出力する。その結果、本実施形態では、特許文献１記載の従来例と比較して、瞬時停電直後における光源10のちらつき発生を抑制することができる。   On the other hand, even if it is determined that the synchronization interval falls within the reference range, the control unit 22 in this embodiment does not immediately output the trigger signals TG3 and TG4, and trigger signals TG5 and TG6 corresponding to the next synchronization signal. Output from. As a result, in the present embodiment, the occurrence of flickering of the light source 10 immediately after the instantaneous power failure can be suppressed as compared with the conventional example described in Patent Document 1.

上述のように本実施形態の調光器２は、正弦波の交流電圧を出力する電源３の出力端間に照明器具１と直列接続されるスイッチング素子Q1と、交流電圧が所定のしきい値Vfを超えている期間を検出し、前記期間と同期した同期信号を出力する同期信号出力部21とを備える。また、調光器２は、同期信号の立ち上がりを起点としてスイッチング素子Q1をオンさせる期間を決定し、且つ前記オン期間にスイッチング素子Q1をオンさせるためのトリガ信号を出力する制御部22を備える。制御部22は、同期信号の立ち上がりの間隔が所定の基準範囲内に収まるか否かを判定し、前記間隔が基準範囲内に収まると判定したときにトリガ信号を出力し、前記間隔が基準範囲を外れると判定したときにトリガ信号の出力を停止する。制御部22は、トリガ信号の出力停止後に前記間隔(同期間隔)が基準範囲内に収まると判定した場合、判定直後の少なくとも１周期目の同期信号に対してはトリガ信号を出力せず、判定直後の２周期目以降の同期信号に対してトリガ信号を出力するように構成される。   As described above, the dimmer 2 of the present embodiment includes the switching element Q1 connected in series with the lighting fixture 1 between the output terminals of the power source 3 that outputs a sine wave AC voltage, and the AC voltage is a predetermined threshold value. A synchronization signal output unit for detecting a period exceeding Vf and outputting a synchronization signal synchronized with the period; The dimmer 2 includes a control unit 22 that determines a period during which the switching element Q1 is turned on starting from the rising edge of the synchronization signal, and outputs a trigger signal for turning on the switching element Q1 during the on period. The control unit 22 determines whether the rising interval of the synchronization signal is within a predetermined reference range, and outputs a trigger signal when determining that the interval is within the reference range, and the interval is within the reference range. The trigger signal output is stopped when it is determined that the signal is off. If the control unit 22 determines that the interval (synchronization interval) falls within the reference range after stopping the output of the trigger signal, the control unit 22 does not output a trigger signal for at least the first synchronization signal immediately after the determination. It is configured to output a trigger signal for the synchronization signal in the second and subsequent cycles immediately after.

本実施形態の調光器２は上述のように構成されるので、瞬時停電の発生タイミングによらず、特許文献１記載の従来例と比較して、瞬時停電直後における光源10のちらつき発生を抑制することができる。   Since the dimmer 2 of the present embodiment is configured as described above, the occurrence of flickering of the light source 10 immediately after the instantaneous power failure is suppressed as compared with the conventional example described in Patent Document 1, regardless of the occurrence timing of the instantaneous power failure. can do.

ここで、制御部22は、トリガ信号の出力停止後に同期間隔が基準範囲内に収まると判定した回数が２以上の所定回数に達した場合にトリガ信号の出力を再開するように構成されても構わない。つまり、交流電源３が不安定である場合、例えば、交流電源３が太陽電池とパワーコンディショナで構成される場合でも、制御部22が、電源電圧が安定するまで待機してからトリガ信号の出力を再開するので、照明器具１が異常動作する可能性の低減が図られる。   Here, the control unit 22 may be configured to restart the trigger signal output when the number of times that the synchronization interval is determined to be within the reference range after the trigger signal output is stopped reaches a predetermined number of two or more. I do not care. That is, when the AC power supply 3 is unstable, for example, even when the AC power supply 3 is configured by a solar battery and a power conditioner, the control unit 22 waits until the power supply voltage becomes stable before outputting the trigger signal. Therefore, the possibility that the lighting fixture 1 operates abnormally is reduced.

一方、瞬時停電の発生からトリガ信号の出力再開までの時間(トリガ信号の停止期間)が長くなるほど、照明器具１の光源10が消灯している時間(消灯期間)も長くなる。   On the other hand, the longer the time from the occurrence of an instantaneous power failure to the resumption of trigger signal output (trigger signal stop period), the longer the time during which the light source 10 of the luminaire 1 is extinguished (extinguishment period).

そこで、制御部22は、同期間隔が基準範囲を外れると判定した場合、判定直後の１周期目の同期信号に対してはトリガ信号TG1，TG2を出力せず、判定直後の２周期目以降の同期信号に対してトリガ信号TG3，TG4を出力するように構成されてもよい(図４参照)。制御部22が上述のように構成されれば、瞬時停電直後における光源10のちらつき発生を抑制しつつ、照明器具１の消灯期間の短縮を図ることができる。   Therefore, when determining that the synchronization interval is outside the reference range, the control unit 22 does not output the trigger signals TG1 and TG2 for the synchronization signal in the first cycle immediately after the determination, and after the second cycle immediately after the determination. The trigger signals TG3 and TG4 may be output in response to the synchronization signal (see FIG. 4). If the control unit 22 is configured as described above, it is possible to shorten the turn-off period of the lighting fixture 1 while suppressing the occurrence of flickering of the light source 10 immediately after the instantaneous power failure.

また、本実施形態ではトリガ信号が１周期でも欠落すると照明器具１が消灯する場合を例示したが、照明器具１にてトリガ信号の読み取りを平均化すれば、わずかなトリガ信号の欠落が光出力に与える影響を低減することもできる。   Further, in the present embodiment, the case where the lighting fixture 1 is turned off when the trigger signal is lost even in one cycle is illustrated, but if the reading of the trigger signal is averaged by the lighting fixture 1, a slight loss of the trigger signal is output as light. It is also possible to reduce the influence on.

１ 照明器具
２ 調光器
３ 交流電源(電源)
21 同期信号出力部
22 制御部 DESCRIPTION OF SYMBOLS 1 Lighting fixture 2 Dimmer 3 AC power supply (power supply)
21 Sync signal output
22 Control unit

Claims (5)

正弦波の交流電圧を出力する電源の出力端間に照明器具と直列接続されるスイッチング素子と、前記交流電圧が所定のしきい値を超えている期間を検出し、前記期間と同期した同期信号を出力する同期信号出力部と、前記同期信号の立ち上がりを起点として前記スイッチング素子をオンさせる期間を決定し、且つ前記オン期間に前記スイッチング素子をオンさせるためのトリガ信号を出力する制御部とを備え、
前記制御部は、前記同期信号の立ち上がりの間隔が所定の基準範囲内に収まるか否かを判定し、前記間隔が前記基準範囲内に収まると判定したときに前記トリガ信号を出力し、前記間隔が前記基準範囲を外れると判定したときに前記トリガ信号の出力を停止し、さらに、前記トリガ信号の出力停止後に前記間隔が前記基準範囲内に収まると判定した場合、前記判定直後の少なくとも１周期目の前記同期信号に対しては前記トリガ信号を出力せず、前記判定直後の２周期目以降の前記同期信号に対して前記トリガ信号を出力するように構成されることを特徴とする調光器。 A switching element connected in series with a lighting fixture between output terminals of a power source that outputs an AC voltage of a sine wave, and a synchronization signal that detects a period in which the AC voltage exceeds a predetermined threshold and is synchronized with the period And a control unit that determines a period during which the switching element is turned on starting from the rising edge of the synchronization signal and outputs a trigger signal for turning on the switching element during the on period. Prepared,
The control unit determines whether or not a rising interval of the synchronization signal falls within a predetermined reference range, and outputs the trigger signal when determining that the interval falls within the reference range. Stops the output of the trigger signal when it is determined that it is out of the reference range, and further determines that the interval falls within the reference range after stopping the output of the trigger signal, at least one cycle immediately after the determination The dimming is characterized in that the trigger signal is not output with respect to the synchronization signal of the eye, and the trigger signal is output with respect to the synchronization signal in the second and subsequent cycles immediately after the determination. vessel. 前記制御部は、前記トリガ信号の出力停止後に前記間隔が前記基準範囲内に収まると判定した回数が２以上の所定回数に達した場合に前記トリガ信号の出力を再開するように構成されることを特徴とする請求項１記載の調光器。   The control unit is configured to resume the output of the trigger signal when the number of times the interval is determined to be within the reference range after the trigger signal output is stopped reaches a predetermined number of 2 or more. The dimmer according to claim 1. 正弦波の交流電圧を出力する電源の出力端間に照明器具と直列接続されるスイッチング素子と、前記交流電圧が所定のしきい値を超えている期間を検出し、前記期間と同期した同期信号を出力する同期信号出力部と、前記同期信号の立ち上がりを起点として前記スイッチング素子をオンさせる期間を決定し、且つ前記オン期間に前記スイッチング素子をオンさせるためのトリガ信号を出力する制御部とを備え、
前記制御部は、前記同期信号の立ち上がりの間隔が所定の基準範囲内に収まるか否かを判定し、前記間隔が前記基準範囲内に収まると判定したときに前記トリガ信号を出力し、前記間隔が前記基準範囲を外れると判定した場合、前記判定直後の１周期目の前記同期信号に対しては前記トリガ信号を出力せず、前記判定直後の２周期目以降の前記同期信号に対して前記トリガ信号を出力するように構成されることを特徴とする調光器。 A switching element connected in series with a lighting fixture between output terminals of a power source that outputs an AC voltage of a sine wave, and a synchronization signal that detects a period in which the AC voltage exceeds a predetermined threshold and is synchronized with the period And a control unit that determines a period during which the switching element is turned on starting from the rising edge of the synchronization signal and outputs a trigger signal for turning on the switching element during the on period. Prepared,
The control unit determines whether or not a rising interval of the synchronization signal falls within a predetermined reference range, and outputs the trigger signal when determining that the interval falls within the reference range. Is determined to be out of the reference range, the trigger signal is not output for the synchronization signal in the first cycle immediately after the determination, and the synchronization signal in the second cycle and thereafter immediately after the determination is not output. A dimmer configured to output a trigger signal. 請求項１〜３の何れかの調光器と、前記調光器とともに前記電源の出力端間に直列接続される照明器具とを有することを特徴とする照明装置。   4. A lighting device comprising: the dimmer according to claim 1; and a lighting fixture connected in series between output terminals of the power source together with the dimmer. 前記照明器具は、光源として固体発光素子を備えることを特徴とする請求項４記載の照明装置。   The lighting device according to claim 4, wherein the lighting fixture includes a solid-state light emitting element as a light source.
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