High pressure discharge lamp ballast, lighting device and lighting system

Abstract

The invention relates to a high pressure discharge lamp ballast, a lighting device and a lighting system, which can meet an electrode require, adequately heat and form a stable discharge without making the circuit structure complex. The high pressure discharge lamp ballast (1) comprises a full-bridge circuit (11) which converts DC power into AC power, a startup circuit (12) which generates a startup high voltage for breaking down the lamp (DL) insulation, a buck chopper (13) which reduces the output voltage of a DC power supply (E) and outputting to the full-bridge circuit (11), a lamp ballast state detection unit (14) which detects the lamp (DL) ballast state, and a control circuit (15) which controls the full-bridge circuit (11) and the startup circuit (13). The control circuit (15) sets the lamp power supply during the electrode heating period when the lamp is started according to an accumulation ballast time detected by the lamp ballast detection unit (14).

Description

technical field The present invention relates to a high-pressure discharge lamp lighting device for lighting a high-pressure discharge lamp, a lighting fixture using the same, and a lighting system constructed of a plurality of lighting fixtures. Background technique Conventionally, high-intensity high-pressure discharge lamps called HID (High-Intensity Discharge) have been widely used mainly for vehicles. In this high-pressure discharge lamp, since discharge needs to be generated in the lamp during lighting, a lighting device including a power conversion circuit that inputs DC power and outputs AC power, and a control circuit that controls the power conversion circuit is required. As a high-pressure discharge lamp lighting device, it has been proposed to set the ignition period (hereinafter referred to simply as "phase 1") in which a control circuit raises the voltage of a power conversion circuit and applies a voltage to a high-pressure discharge lamp to cause dielectric ...

AI Technical Summary

Problems solved by technology

However, in order to realize the above-mentioned method, a detection circuit and a control circuit with a complicated structure are required, and cost increases accompanied by an increase in the number of parts occur.

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