US 12,394,957 B2
Laser diode drive circuit
Takahiro Matsuoka, Nagaokakyo (JP); and Naomi Takimoto, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Nagaokakyo (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Mar. 30, 2022, as Appl. No. 17/657,144.
Application 17/657,144 is a continuation of application No. PCT/JP2020/023943, filed on Jun. 18, 2020.
Claims priority of application No. 2019-180617 (JP), filed on Sep. 30, 2019.
Prior Publication US 2022/0224075 A1, Jul. 14, 2022
Int. Cl. H01S 5/042 (2006.01); H01S 5/40 (2006.01); H03K 17/687 (2006.01); G01S 7/484 (2006.01)
CPC H01S 5/0428 (2013.01) [H01S 5/4025 (2013.01); H03K 17/6871 (2013.01); G01S 7/484 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A laser diode drive circuit comprising:
at least one laser diode;
a driving switching element connected in series to an anode side of the at least one laser diode and configured to switch between an ON state in which a current is supplied to the at least one laser diode and an OFF state in which the current is not supplied to the at least one laser diode;
a driving capacitor having a first end connected to the driving switching element and configured to supply a current to the at least one laser diode;
a drive circuit configured to drive the driving switching element; and
a boot strap circuit configured to supply a voltage to the drive circuit for driving the driving switching element, with the boot strap circuit including:
a capacitor connected to the drive circuit having a first end connected to a source electrode of the driving switching element and a second end connected to a gate electrode of the driving switching element, and
a current suppression element connected to the first end of the capacitor and configured to suppress a flow of a current that flows to the capacitor and to the at least one laser diode connected in parallel during a charging of the capacitor.