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11. 发明专利

DE102004039414B4 Entladungslampenansteuerschaltung 未知
公开(公告)号：DE102004039414B4
公开(公告)日：2010-09-23
申请号：DE102004039414
申请日：2004-08-13
申请人： KOITO MFG CO LTD
发明人： OHTA SHINJI , ITO MASAYASU
IPC分类号： H05B41/24 , H05B41/288 , H05B41/18 , H05B41/38

12. 发明专利

DE102005043365A1 未知
公开(公告)号：DE102005043365A1
公开(公告)日：2006-03-30
申请号：DE102005043365
申请日：2005-09-12
申请人： KOITO MFG CO LTD
发明人： OHTA SHINJI , ICHIKAWA TOMOYUKI
IPC分类号： H05B41/282
摘要： In a lighting apparatus for a discharge lamp, a mask signal against a re-arc voltage is correctly generated to detect a lamp voltage accurately in view of a support to high frequency lighting such that the detection of the lamp voltage is not affected by the re-arc voltage. The lighting apparatus for the discharge lamp comprises a DC-AC converter for receiving an input voltage from a DC power supply to convert the input voltage to an AC voltage; detecting means for detecting a lamp voltage associated with a discharge lamp or a lamp voltage and a lamp current; and a signal generator circuit for generating a mask signal for excluding a re-arc voltage, which occurs at the time the polarity is inverted, from items to be detected, in the event of a detection of the lamp voltage. The signal generator circuit detects the lamp voltage or lamp current or a voltage at an output stage of the DC-AC converter to correctly capture a polarity inversion timing to generate a mask signal against the re-arc voltage. A timing shift of the mask signal can be limited within an allowable range even if the discharge lamp is lit at a high frequency.

13. 发明专利

DE102004039414A1 未知
公开(公告)号：DE102004039414A1
公开(公告)日：2005-03-24
申请号：DE102004039414
申请日：2004-08-13
申请人： KOITO MFG CO LTD
发明人： OHTA SHINJI , ITO MASAYASU
IPC分类号： H05B41/24 , H05B41/18 , H05B41/288 , H05B41/38
摘要： A discharge lamp illumination circuit 1 has a DC-AC conversion circuit 3 , which effects DC-AC conversion and boosting upon receipt of a DC input, and a starter circuit 4 . Power output from the DC-AC conversion circuit 3 is controlled by means of control means 6 . The DC-AC conversion circuit 3 has an AC conversion transformer 7 ; a plurality of switching elements 5 H and 5 L; and a resonance capacitor 8 . The switching elements are activated by the control means 6 , thereby causing serial resonance between the resonance capacitor 8 and a leakage inductance component of the AC conversion transformer 7 , or between the resonance capacitor 8 and an inductance component 9 connected to the resonance capacitor 8 . Provided that a resonance frequency achieved during an extinction period of the discharge lamp 10 is denoted as f 1 , the operating frequency is first regulated to a frequency level deviating from f 1 and then gradually reduced so as to approach f 1 in connection with a no-load voltage which is applied to the discharge lamp before illuminating.

14. 发明专利

FR2858909A1 Lighting circuit for automobile, has determination device detecting state of lamp when absolute value of difference between detected voltage and current values during switched off state is greater than value in switched on state 未知
公开(公告)号：FR2858909A1
公开(公告)日：2005-02-18
申请号：FR0408887
申请日：2004-08-13
申请人： KOITO MFG CO LTD
发明人： OHTA SHINJI , ITO MASAYASU
IPC分类号： H05B41/24 , H05B37/03 , H05B41/28 , H05B41/288 , H05B41/36
摘要： The lighting circuit (6) has a current and voltage detection devices (12, 13) detecting current and voltage in a discharge lamp, respectively. A determination device (25) detects a state of the lamp based on values detected by the devices (12, 13). The state is detected when an absolute value of a difference between the values detected during a switched off state is greater than the corresponding value detected in a switched on state.

15. 发明专利

FR2855920B1 未知
公开(公告)号：FR2855920B1
公开(公告)日：2006-07-28
申请号：FR0406048
申请日：2004-06-04
申请人： KOITO MFG CO LTD
发明人： ICHIKAWA TOMOYUKI , OHTA SHINJI
IPC分类号： H02M3/28 , H02M3/156 , H02M3/335 , H05B41/26 , H05B41/282 , H05B41/288
摘要： In a fly-back DC voltage conversion circuit, a transformer accumulates energy during the on-state of a switching element, and the accumulated energy is outputted from a secondary winding during the off-state of the switching element. The switching element is placed in the on-state when the accumulated energy is completely outputted from the secondary winding. A voltage applied to the switching element is differentiated by a capacitor to detect a discharge termination point at which the current of the transformer becomes zero to change a switching frequency of the switching element. The DC voltage conversion circuit can attain control in a current boundary state without significantly increasing cost.

16. 发明专利

FR2858909B1 未知
公开(公告)号：FR2858909B1
公开(公告)日：2006-07-21
申请号：FR0408887
申请日：2004-08-13
申请人： KOITO MFG CO LTD
发明人： OHTA SHINJI , ITO MASAYASU
IPC分类号： H05B41/24 , H05B41/28 , H05B37/03 , H05B41/288 , H05B41/36
摘要： The lighting circuit (6) has a current and voltage detection devices (12, 13) detecting current and voltage in a discharge lamp, respectively. A determination device (25) detects a state of the lamp based on values detected by the devices (12, 13). The state is detected when an absolute value of a difference between the values detected during a switched off state is greater than the corresponding value detected in a switched on state.

17. 发明专利

DE102004027373A1 未知
公开(公告)号：DE102004027373A1
公开(公告)日：2005-01-05
申请号：DE102004027373
申请日：2004-06-04
申请人： KOITO MFG CO LTD
发明人： ICHIKAWA TOMOYUKI , OHTA SHINJI
IPC分类号： H02M3/28 , H02M3/156 , H02M3/335 , H05B41/282 , H05B41/288 , H05B37/02
摘要： In a fly-back DC voltage conversion circuit, a transformer accumulates energy during the on-state of a switching element, and the accumulated energy is outputted from a secondary winding during the off-state of the switching element. The switching element is placed in the on-state when the accumulated energy is completely outputted from the secondary winding. A voltage applied to the switching element is differentiated by a capacitor to detect a discharge termination point at which the current of the transformer becomes zero to change a switching frequency of the switching element. The DC voltage conversion circuit can attain control in a current boundary state without significantly increasing cost.

18. 发明专利

FR2836762A1 DC-DC converter circuit to supply discharge lamp, e.g. for vehicle, uses minimization of interval between secondary current falling to zero and primary current circulating to maximize switching frequency 未知
公开(公告)号：FR2836762A1
公开(公告)日：2003-09-05
申请号：FR0302449
申请日：2003-02-28
申请人： KOITO MFG CO LTD
发明人： ICHIKAWA TOMOYUKI , OHTA SHINJI
IPC分类号： H02M3/335 , H05B41/288 , H02M3/28 , H05B41/14
摘要： The chopper circuit has a transformer (10) with a switch (11) in its primary. The time interval between the moment where the transformer secondary current (10s) reaches zero and the moment where the transformer primary current (10p) starts to circulate is detected, and the switching frequency is adapted to reduce this interval.

19. 发明专利

FR3046330B1 CIRCUIT D'ECLAIRAGE ET FEU CLIGNOTANT DE VEHICULE 未知
公开(公告)号：FR3046330B1
公开(公告)日：2020-11-20
申请号：FR1663449
申请日：2016-12-28
申请人： KOITO MFG CO LTD
发明人： OHTA SHINJI
IPC分类号： B60Q1/00 , H02H3/02 , H05B44/00
摘要： Un circuit d'éclairage (2) pour le clignotement d'une unité d'émission de lumière (3) ayant plusieurs systèmes de source de lumière (PL1 à PL3) est équipé d'une unité de détection d'anomalie (22) qui génère une information d'anomalie (Sdt, Sdt') lors de la détection d'une anomalie même dans un des différents systèmes de source de lumière (PL1 à PL3), et d'un circuit de maintien (23) qui maintient l'information d'anomalie (Sdt, Sdt') pendant une période où le circuit d'éclairage (2) est alimenté avec un signal de clignotement. Le circuit d'éclairage (2) délivre un ou des courants de commande aux différents systèmes de source de lumière (PL1 à PL3) en fonction du signal de clignotement et cesse de délivrer un ou des courants de commande à tous les systèmes de source de lumière (PL1 à PL3) en fonction de l'information d'anomalie (Sdt, Sdt') qui est maintenue par le circuit de maintien (23).

20. 发明专利

FR3046330A1 CIRCUIT D'ECLAIRAGE ET FEU CLIGNOTANT DE VEHICULE 未知
公开(公告)号：FR3046330A1
公开(公告)日：2017-06-30
申请号：FR1663449
申请日：2016-12-28
申请人： KOITO MFG CO LTD
发明人： OHTA SHINJI
IPC分类号： H05B37/02 , B60Q1/00 , F21S8/10 , H02H3/02 , H05B44/00
摘要： Un circuit d'éclairage (2) pour le clignotement d'une unité d'émission de lumière (3) ayant plusieurs systèmes de source de lumière (PL1 à PL3) est équipé d'une unité de détection d'anomalie (22) qui génère une information d'anomalie (Sdt, Sdt') lors de la détection d'une anomalie même dans un des différents systèmes de source de lumière (PL1 à PL3), et d'un circuit de maintien (23) qui maintient l'information d'anomalie (Sdt, Sdt') pendant une période où le circuit d'éclairage (2) est alimenté avec un signal de clignotement. Le circuit d'éclairage (2) délivre un ou des courants de commande aux différents systèmes de source de lumière (PL1 à PL3) en fonction du signal de clignotement et cesse de délivrer un ou des courants de commande à tous les systèmes de source de lumière (PL1 à PL3) en fonction de l'information d'anomalie (Sdt, Sdt') qui est maintenue par le circuit de maintien (23).

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