公开(公告)号：US10225899B2

公开(公告)日：2019-03-05

申请号：US15565768

申请日：2016-03-17

Applicant: KOWA COMPANY, LTD.

Inventor： Yutaka Mizukusa ,  Kenichi Inoue ,  Kazuhiro Kashiwagi ,  Ayafumi Taniji

IPC: H05B37/02 ,  H05B33/08 ,  A01G7/00 ,  A01G31/00 ,  A01G7/04

Abstract: A lighting system for plant cultivation comprises a light source, a light source driving unit that drives the light source, and a control unit that transmits a pulse signal to the light source driving unit. The control unit comprises a first pulse generating unit that generates a first pulse signal (S1) of a predetermined frequency, a second pulse generating unit that generates a second pulse signal (S2) of a frequency different from the predetermined frequency, and a pulse signal selecting unit that selects any one of the first pulse signal (S1) and the second pulse signal (S2) to transmit the selected one to the light source driving unit. The light source driving unit includes a frequency determining unit that determines whether the frequency of the pulse signal received from the control unit is the frequency of the first pulse signal (S1) or the frequency of the second pulse signal (S2), a first driving unit that, when receiving the first pulse signal (S1) from the control unit, converts the first pulse signal (S1) to a constant current, output to drive the light source, and a second driving unit that, when receiving the second pulse signal (S2) from the control unit, outputs a pulse with an original pulse waveform of the second pulse signal (S2) to drive the light source.