Power supply device and luminaire

Abstract

A power supply device and a luminaire which are capable of keeping the output of the load constant and reducing noise intensity are provided. According to one embodiment, the power supply device includes a rectifying circuit configured to rectify an alternating-current power supply and a power-supply-voltage converting section. The power-supply-voltage converting section includes a plurality of power-supply-voltage converting circuits provided between the rectifying circuit and a plurality of output sections to which loads are respectively connected. Switching elements configured to convert a power supply voltage rectified by the rectifying circuit and supply the power supply voltage to the loads are provided in the plurality of power-supply-voltage converting circuits. The switching elements of the plurality of power-supply-voltage converting circuits are set to at least two different switching frequencies and turned on and off with the respective switching frequencies fixed.

Description

technical field [0001] Embodiments of the present invention relate to a power supply device that supplies electric power to a load, and a lighting device including the power supply device. Background technique [0002] Conventionally, for example, in a power supply device using a light-emitting diode (Light Emitting Diode, LED) element as a load, a rectifier circuit is used to rectify the AC power supply, and a switching element of the power supply voltage conversion circuit is turned on and off. In operation, the rectified DC voltage is converted, and then supplied to the LED element to turn on the LED element. [0003] In addition, it is known that noise superimposed on the power supply voltage leaks to the AC power supply side due to the switching operation of the switching element, and affects other electrical equipment connected to the AC power supply. Therefore, in many cases, an anti-noise filter circuit (filter circuit) for reducing noise is provided between the AC ...

AI Technical Summary

Problems solved by technology

[0008] Illumination devices using LED elements are achieving higher output, but the power converted by the power supply voltage conversion circuit of the power supply device will increase due to this higher output, and the noise leaking from the power supply device to the AC power supply side will also tend to increase.

[0009] Therefore, in the case of the anti-noise filter circuit, unless a large-scale anti-noise filter circuit is used, the anti-noise effect will be insufficient.

[0010] In addition, when the switching frequency of the switching element is randomly changed, the circuit constituting the switching element becomes complicated, and the brightness as an output may change according to the change in the switching frequency.

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