公开(公告)号：US20180124888A1

公开(公告)日：2018-05-03

申请号：US15565768

申请日：2016-03-17

Applicant: KOWA COMPANY, LTD.

Inventor： Yutaka MIZUKUSA ,  Kenichi INOUE ,  Kazuhiro KASHIWAGI ,  Ayafumi TANIJI

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

CPC classification number: H05B33/0845 ,  A01G7/045 ,  A01G31/00 ,  H05B37/02 ,  H05B37/0281 ,  Y02P60/146

Abstract: The lighting system for plant cultivation (9) according to the present invention is configured to be capable of switching between an intermittent lighting mode and a continuous lighting mode. The intermittent lighting mode is a mode in which a light source emits light with a lighting cycle comprising a light period of turning on the light source for a predetermined time period and a dark period of turning off the light source for a predetermined time period. The continuous lighting mode is a mode in which the light source continuously emits light. In another aspect, the lighting system for plant cultivation (9) comprises a light source (3), a light source driving unit (2) that drives the light source (3), and a control unit (1) that transmits a pulse signal to the light source driving unit (2). The control unit (1) comprises a first pulse generating unit (11) that generates a first pulse signal (S1) of a predetermined frequency, a second pulse generating unit (12) that generates a second pulse signal (S2) of a frequency different from the predetermined frequency, and a pulse signal selecting unit (13) 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 (2). The light source driving unit (3) includes a frequency determining unit (21) that determines whether the frequency of the pulse signal received from the control unit (1) is the frequency of the first pulse signal (S1) or the frequency of the second pulse signal (S2), a first driving unit (23) that, when receiving the first pulse signal (S1) from the control unit (1), converts the first pulse signal (S1) to a constant current output to drive the light source (3), and a second driving unit (24, 25) that, when receiving the second pulse signal (S2) from the control unit (1), outputs a pulse with an original pulse waveform of the second pulse signal (S2) to drive the light source (3).