POWER SUPPLY CIRCUIT AND LUMINAIRE

摘要

There is provided a power supply circuit including a power converting unit configured to convert a conduction angle controlled alternating-current voltage supplied via a power supply path and supply a direct-current voltage to a load, a control unit configured to detect a conduction angle of the alternating-current voltage and control the conversion of the voltage according to the detected conduction angle, and a power supply unit including a first branch path electrically connected to the power supply path, a semiconductor element configured to adjust an electric current flowing to the first branch path, a thermosensor configured to limit, if the temperature of the semiconductor element is equal to or higher than an upper limit temperature, an electric current flowing to the semiconductor element. The power supply unit converts the alternating-current voltage input via the first branch path and supplies a direct-current voltage to the control unit.

主权项

1. A power supply circuit comprising:
a power converting unit configured to convert a conduction angle controlled alternating-current voltage supplied via a power supply path and supply a direct-current voltage to a load; a control unit configured to detect a conduction angle of the alternating-current voltage and control the conversion of the voltage by the power converting unit according to the detected conduction angle; and a power supply unit for control including a first branch path electrically connected to the power supply path, a semiconductor element configured to adjust an electric current flowing to the first branch path, a thermosensor configured to limit, if temperature of the semiconductor element is equal to or higher than an upper limit temperature, an electric current flowing to the semiconductor element, the power supply unit for control converting the alternating-current voltage input via the first branch path and supplying a direct-current voltage to the control unit.