Title:
LIGHT EMITTING ELEMENT DRIVE CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2024/070709
Kind Code:
A1
Abstract:
A light emitting element drive circuit (100) comprises: a boost voltage source (7) that applies a first voltage to an LD (10); a main voltage source (4) that applies a second voltage that is lower than the first voltage to the LD (10); a MOSFET (2A) that switches on/off of application of the first voltage to the LD (10); and a linear regulator (6) that controls current flowing to the LD (10). The linear regulator (6) includes: a current detector (62); a MOSFET (61) through which current that flows to the LD (10) flows; and a drive unit (63A) that drives the MOSFET (61). The drive unit (63A) includes: a gate drive circuit (68) that drives the MOSFET (61); two or more constant circuits to each of which a different control constant is set; and a switching mechanism (SW1) that selects one of the two or more constant circuits and performs connecting thereof to the gate drive circuit (68), in accordance with whether voltage applied to the LD (10) is the first voltage or the second voltage.
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Inventors:
NISHIMURA KENGO (JP)
WAKAIKI SHUJI (JP)
NAKAJIMA KOJI (JP)
KUMAGAI TAKASHI (JP)
TSUNODA YOSHIKAZU (JP)
MORIMOTO TAKESHI (JP)
IGARASHI YUICHI (JP)
WAKAIKI SHUJI (JP)
NAKAJIMA KOJI (JP)
KUMAGAI TAKASHI (JP)
TSUNODA YOSHIKAZU (JP)
MORIMOTO TAKESHI (JP)
IGARASHI YUICHI (JP)
Application Number:
PCT/JP2023/033414
Publication Date:
April 04, 2024
Filing Date:
September 13, 2023
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H05B45/395; H05B45/34
Foreign References:
| JP2002335038A | 2002-11-22 | |||
| JP2000307186A | 2000-11-02 |
Attorney, Agent or Firm:
TAKAMURA, Jun (JP)
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