EP1087643A2 - Beleuchtungssteuerungsschaltung für eine Lampe - Google Patents

Beleuchtungssteuerungsschaltung für eine Lampe Download PDF

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Publication number
EP1087643A2
EP1087643A2 EP00203262A EP00203262A EP1087643A2 EP 1087643 A2 EP1087643 A2 EP 1087643A2 EP 00203262 A EP00203262 A EP 00203262A EP 00203262 A EP00203262 A EP 00203262A EP 1087643 A2 EP1087643 A2 EP 1087643A2
Authority
EP
European Patent Office
Prior art keywords
lamp
voltage
control circuit
lighting control
scr2
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00203262A
Other languages
English (en)
French (fr)
Other versions
EP1087643A3 (de
EP1087643B1 (de
Inventor
Makoto Arai
Yukihiro Shimoda
Takashi Suzuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsuba Corp
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Mitsuba Corp
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Filing date
Publication date
Application filed by Mitsuba Corp filed Critical Mitsuba Corp
Publication of EP1087643A2 publication Critical patent/EP1087643A2/de
Publication of EP1087643A3 publication Critical patent/EP1087643A3/de
Application granted granted Critical
Publication of EP1087643B1 publication Critical patent/EP1087643B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04—Controlling
    • H05B39/08—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices

Definitions

  • the present invention relates to a lamp lighting control circuit that conducts lighting of a lamp by using a voltage regulation circuit connected to an electric generator which rotates in conjunction with an engine.
  • an AC voltage is generated by an electric generator rotating in conjunction with an engine, and the AC voltage is used to charge a battery as well as to light a lamp such as a headlight.
  • FIG. 3 shows an example of a control circuit for controlling the battery charging and lamp lighting.
  • an end tap (output terminal) of a coil 2 of a magneto-generator is connected to a power source terminal CH of the control circuit 11, while a battery 3 and a DC load 4 representing various electric equipment are connected to an output terminal BT of the control circuit 11.
  • a battery charge control thyristor SCR1 is provided on a power line extending between the terminals CH and BT for transmitting positive waves of the AC voltage input to the power source terminal CH to the output terminal BT.
  • the battery charge control thyristor SCR1 is controlled by a battery voltage detecting and controlling circuit 6 for detecting the voltage at the output voltage BT and preventing overcharge of the battery.
  • a lamp (headlight) 5 is connected to a lamp terminal LA of the control circuit 11. Between the power source terminal CH and the lamp terminal LA of the control circuit 11 is connected a lamp control thyristor SCR2 for transmitting negative waves of the AC voltage to the lamp 5. Further, a lamp voltage detecting circuit 12 is provided for keeping the lamp control thyristor SCR2 in an off state when it detects that an effective (or root mean square value of) voltage of the lamp exceeds a limit value (for example, 13V), to thereby protect the lamp 5.
  • a limit value for example, 13V
  • FIG 4 is a waveform diagram showing lamp current control in the above circuit.
  • the electric generator 2 provides an AC voltage having a sine waveform as shown in an upper part of Figure 4.
  • the lamp 5 is supplied only with the negative voltage waves, of which amplitude and hence the lamp effective voltage increases with the engine speed.
  • the lamp effective voltage exceeds a limit value during one negative voltage half-wave, because consecutive voltage supply (phantom line in the drawing) could cause an overvoltage, the next negative voltage half-wave is prevented from being supplied to the lamp (solid line in the drawing) so that a so-called intermittent voltage supply control is conducted.
  • the intermittent voltage supply control can result in detectable flickering of the lamp.
  • the lamp voltage may have a substantially the same peak (absolute) value as that of the AC generator voltage, there may be a problem that the increase in the generator voltage amplitude with the engine speed will cause an undesirable increase in the peak value of the lamp voltage, leading to a shorter operable period of time of the lamp.
  • a primary object of the present invention is to provide a lamp lighting control circuit for a motor vehicle utilizing an electric generator which rotates in conjunction with an engine to generate an AC voltage that can suppress the lamp voltage so as to increase the operable period of time of the lamp.
  • a second object of the present invention is to provide a lamp lighting control circuit for a motor vehicle utilizing an electric generator which rotates in conjunction with an engine to generate an AC voltage that can prevent detectable flickering of the lamp as well as prevent overvoltage of the lamp.
  • a third object of the present invention is to provide a lamp lighting control circuit for a motor vehicle utilizing an electric generator which rotates in conjunction with an engine to generate an AC voltage that can reduce the electric power that the electric generator has to produce.
  • a fourth object of the present invention is to provide such a lamp lighting control circuit in a simple configuration with minimum modification to the conventional circuit and at low cost.
  • a lamp lighting control circuit for lighting a lamp (5) with an AC voltage output from an electric generator (2) which rotates in conjunction with an engine, comprising: means (SCR2, 7b) for conducting either one of alternate positive and negative voltage half-waves of the AC voltage from the electric generator (2) to the lamp (5), wherein said means (SCR2, 7b) for conducting reduces a size of said voltage half-wave conducted to the lamp (5).
  • the reduction in the size of the voltage half-wave can achieve a reduced peak value of the lamp voltage for a given engine speed and accordingly, the engine speed at which the generated AC voltage reaches the rate voltage of the lamp can be shifted to a higher engine speed. This can lead to an extended operable period of time of the lamp.
  • the reduction of the size of the voltage half-wave conducted to the lamp (5) may be achieved by controlling an amplitude of said voltage half-wave or by delaying start of conduction of said voltage half-wave to the lamp (5).
  • a lamp lighting control circuit for lighting a lamp (5) with an AC voltage output from an electric generator (2) which rotates in conjunction with an engine, comprising: a switching device (SCR2) connected between the electric generator (2) and the lamp (5); and a drive circuit (7b) for generating an activation signal for turning on said switching device (SCR2) when either one of positive and negative voltage half-waves of said AC voltage is generated from said electric generator (2), wherein said drive circuit (7b) turns on said switching device (SCR2) after a prescribed delay (Td) from a point of time (T1) when said either one of said positive and negative half-waves of said AC voltage begins to be generated from said electric generator (2).
  • Td prescribed delay
  • said drive circuit (7b) may comprise a delay circuit, which can be embodied by a CR time constant circuit (R3, C3).
  • said switching device consists of a thyristor (SCR2).
  • the lamp lighting control circuit may further comprise a lamp effective voltage monitoring circuit (7a) for monitoring an effective voltage of the lamp (5), wherein said lamp effective voltage monitoring circuit (7a) prevents an operation of said drive circuit (7b) when it detects an overvoltage of said lamp (5).
  • Such a lamp effective monitoring circuit (7a) can conduct the intermittent voltage supply control to protect the lamp (5) from an overvoltage. At low engine speed where the intermittent voltage supply control would cause a detectable flickering of the lamp (5), however, since the lamp voltage control is preferably achieved by delaying the turning on of the thyristor (SCR2), the intermittent voltage supply control may be avoided.
  • FIG. 1 is a schematic circuit diagram for showing a lamp voltage regulation circuit according to the present invention.
  • similar parts to those in the conventional embodiment are denoted with the same reference numerals and the detailed explanation thereof is omitted.
  • a control circuit 1 comprises the terminals CH, BT and LA to which the battery 3, DC load, and lamp 5 are connected, respectively, in a similar fashion to the conventional embodiment.
  • the battery charge control thyristor SCR1, lamp control thyristor SCR2 and battery voltage detecting circuit 6 are provided also in a similar fashion to the conventional embodiment.
  • the lamp lighting control circuit 7 for controlling a gate of the lamp control thyristor SCR2 is connected to the lamp lighting control circuit 7 for controlling a gate of the lamp control thyristor SCR2 a generator output voltage detecting block 8.
  • lamp control thyristor SCR2 lamp lighting control circuit 7 and generator output voltage detecting block 8 constitute a lamp voltage regulation circuit.
  • a transistor Q1 is connected to the gate of the lamp control thyristor SCR2.
  • the transistor Q1 is adapted to be turned on when another transistor Q2 is turned on.
  • a diode D1 is connected to the power source terminal CH so as to permit an electric current only toward the power source terminal CH, and via the diode D1, the transistor Q2 and a transistor Q3 for on/off controlling the transistor Q2 are connected to the terminal CH.
  • a base of the transistor Q2 is connected to ground via a resistor R1.
  • a lamp voltage detection block 7a serving as a lamp effective voltage monitoring circuit.
  • the above transistor Q3 constitutes an output stage of the lamp voltage detection block 7a so that turning on of the transistor Q3 causes the transistor Q2 to be turned off.
  • a transistor Q4 that is turned on while an electric current is flowing through the lamp 5 is connected to the generator voltage detecting block 8.
  • a noise absorbing circuit comprising a capacitor C2 and a resistor R2 is provided between the base and emitter of the transistor Q1.
  • a capacitor C3 and a resistor R3 are provided between the base and emitter of the transistor Q2 between the base and emitter of the transistor Q2 and provided a capacitor C3 and a resistor R3 connected in parallel for constituting a CR time constant circuit serving as a delay circuit 9, which may also function as a noise absorbing circuit.
  • the delay circuit 9 and the transistors Q1, Q2 constitute a drive circuit 7b.
  • the lamp voltage detection block 7a in the control circuit 1 detects the lamp effective voltage based on charging and discharging of a capacitor C1 provided in a base circuit of the transistor Q3.
  • the capacitor C1 is charged by an electric current flowing through the transistor Q4 and the generator output voltage detecting block 8 so that the capacitor C1 is charged only while and an electric current is flowing through the lamp 5 and discharged through a resister connected thereto in parallel during other period of time.
  • a zener diode ZD1 is provided between the capacitor C1 and the base of the transistor Q3 so that a limit value of the lamp effective voltage for prohibiting the turning on of the thyristor SCR2 is set by a breakdown voltage of the zener diode ZD1, as described more in detail later.
  • the lamp voltage (lower waveform) is generated after a delay time Td has passed from a negative voltage generation timing T1 in the AC voltage (upper waveform).
  • the delay time Td is determined so that the magnitude (absolute value) of the AC voltage begins to decrease when the magnitude of the lamp voltage is still increasing. This results in the lamp voltage having a smaller peak value (or amplitude) VL max than a peak value VG max of the AC voltage (VL max ⁇ VG max ). Also, the period of time during which the voltage is applied to the lamp 5 (or duration time) is reduced due to the delay time Td.
  • a size (amplitude and duration time) of the voltage half-wave provided to the lamp 5 can be reduced and accordingly the effective voltage of the lamp 5 can be preferably reduced.
  • the amount of electric charge stored in the capacitor C1 in the lamp voltage detection block 7a by a single wave is also reduced with respect to the case where the lamp lighting is started without the delay time Td (phantom line in Figure 2).
  • Td delay time
  • the intermittent voltage supply to the lamp 5 can take place as in the conventional circuit.
  • the intermittent voltage supply control takes place only at a sufficiently high engine speed range where the frequency of the AC voltage from the electric generator 2 is sufficiently high and the intermittent voltage supply control would not cause a detectable flickering of the lamp 5.
  • the delay circuit 9 can also function as a noise absorbing circuit for the transistor Q3 and thus no additional circuit is required, a simple control circuit can be achieved with a reduced manufacturing cost.
  • the turning on of the thyristor SCR2 is controlled by the drive circuit 7b so that the size of the voltage half-wave (or the amount of electricity) conducted to the lamp 5 is reduced with respect to the case where the generated electricity, which increases with the engine speed, is supplied to the lamp 5 directly without delay.
  • This can reduce the peak value of the lamp voltage for a given engine speed, and the engine speed at which the AC voltage reaches the rated lamp voltage is shifted to a higher engine speed side, whereby an extended operable period of time of the lamp 5 is preferably achieved.
  • the reduction in size of the voltage half-wave conducted to the lamp 5 can reduce the effective lamp voltage without conducting intermittent voltage supply control.
  • intermittent lamp voltage supply control to the lamp could take place to protect the lamp 5 from an excessive generated electric power
  • such intermittent lamp voltage supply control will take place only in a high engine speed range where the frequency of the AC voltage is sufficiently high and the lamp flickering due to the intermittent lamp voltage supply control can be inconspicuous. Therefore, it is possible to prevent flickering of the lamp at low engine speed and at the same time to prevent overvoltage of the lamp at high engine speed.
  • the control of the amplitude of the half-wave supplied to the lamp 5 may be achievable by connecting a resister between the electric generator 2 and the lamp 5.
  • an electric power would be dissipated as heat at the resister and this would be undesirable in view of minimizing the electric power that the electric generator 2 has to produce.
  • the lamp voltage control can be preferably achieved by delaying the turning on of the thyristor SCR2 connected between the lamp 5 and the generator 2 without causing an undesirable dissipation of the generated electric power.

Landscapes

  • Control Of Charge By Means Of Generators (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Rectifiers (AREA)
  • Control Of Eletrric Generators (AREA)
EP20000203262 1999-09-22 2000-09-20 Beleuchtungssteuerungsschaltung für eine Lampe Expired - Lifetime EP1087643B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP26844899 1999-09-22
JP26844899A JP4480817B2 (ja) 1999-09-22 1999-09-22 ランプ点灯制御回路

Publications (3)

Publication Number Publication Date
EP1087643A2 true EP1087643A2 (de) 2001-03-28
EP1087643A3 EP1087643A3 (de) 2003-12-10
EP1087643B1 EP1087643B1 (de) 2009-11-18

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ID=17458660

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000203262 Expired - Lifetime EP1087643B1 (de) 1999-09-22 2000-09-20 Beleuchtungssteuerungsschaltung für eine Lampe

Country Status (3)

Country Link
EP (1) EP1087643B1 (de)
JP (1) JP4480817B2 (de)
ID (1) ID27293A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2665345A1 (de) * 2011-04-28 2013-11-20 Shindengen Electric Manufacturing Co., Ltd. Steuerschaltung und steuerverfahren
TWI514921B (zh) * 2012-10-18 2015-12-21 Shindengen Electric Mfg LED lights lighting control circuit and LED lights lighting control method

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4597194B2 (ja) * 2005-05-02 2010-12-15 新電元工業株式会社 バッテリ充電およびランプ点灯制御回路
JP5418287B2 (ja) * 2010-02-23 2014-02-19 株式会社デンソー エンジンの発電システム
WO2023275934A1 (ja) * 2021-06-28 2023-01-05 新電元工業株式会社 バッテリ充電装置、及び電流制御装置
JP7450771B2 (ja) * 2021-07-08 2024-03-15 新電元工業株式会社 バッテリ充電装置、及び電流制御装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2674382A1 (fr) * 1991-03-18 1992-09-25 Mitsuba Electric Mfg Co Dispositif de regulation de tension de sortie pour alternateur.
FR2742278A1 (fr) * 1995-11-09 1997-06-13 Mitsuba Corp Dispositif de regulation de tension pour un generateur magneto-electrique
EP0936720A2 (de) * 1998-02-12 1999-08-18 Mitsuba Corporation Co., Ltd. Lampbeleuchtungs- und Batterieladesteuerungssystem für ein Fahrzeug
EP0965752A2 (de) * 1998-06-19 1999-12-22 DUCATI ENERGIA S.p.A. Phasenkontrollierter Spannungsregler für Kraftfahrzeuge und Methode

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2674382A1 (fr) * 1991-03-18 1992-09-25 Mitsuba Electric Mfg Co Dispositif de regulation de tension de sortie pour alternateur.
FR2742278A1 (fr) * 1995-11-09 1997-06-13 Mitsuba Corp Dispositif de regulation de tension pour un generateur magneto-electrique
EP0936720A2 (de) * 1998-02-12 1999-08-18 Mitsuba Corporation Co., Ltd. Lampbeleuchtungs- und Batterieladesteuerungssystem für ein Fahrzeug
EP0965752A2 (de) * 1998-06-19 1999-12-22 DUCATI ENERGIA S.p.A. Phasenkontrollierter Spannungsregler für Kraftfahrzeuge und Methode

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2665345A1 (de) * 2011-04-28 2013-11-20 Shindengen Electric Manufacturing Co., Ltd. Steuerschaltung und steuerverfahren
EP2665345A4 (de) * 2011-04-28 2014-11-26 Shindengen Electric Mfg Steuerschaltung und steuerverfahren
TWI514921B (zh) * 2012-10-18 2015-12-21 Shindengen Electric Mfg LED lights lighting control circuit and LED lights lighting control method

Also Published As

Publication number Publication date
EP1087643A3 (de) 2003-12-10
JP2001093680A (ja) 2001-04-06
EP1087643B1 (de) 2009-11-18
JP4480817B2 (ja) 2010-06-16
ID27293A (id) 2001-03-22

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