LED lighting power supply

Abstract

Disclosed is an LED light fixture power supply. The LED light fixture power supply comprises a primary circuit module, a secondary circuit module electrically coupled to the primary circuit module, a PWM light modulation control circuit module electrically connected with the secondary circuit module, and an EMI filtering module electrically connected with the PWM light modulation control circuit module. The PWM light modulation control circuit module is electrically coupled to the primary circuit module to obtain electric power and transmits light modulation signals to the secondary circuit module. The EMI filtering module, the PWM light modulation control circuit module and the primary circuit module form a loop for eliminating common-mode interference signals generated when the PWM light modulation control circuit module outputs PWM signals. The loop formed by the EMI filtering module inside the power supply can eliminate the common-mode interference signals generated when the PWM light modulation control circuit module outputs the PWM signals so that the common-mode interference signals are prevented from penetration into an EMI test network and the purpose of successful EMI testing is realized.

Description

technical field [0001] The invention relates to a power supply device of an illumination system, in particular to a power supply of an LED lamp. Background technique [0002] In general daily life, various lighting devices can be seen everywhere, for example, fluorescent lamps, street lamps, table lamps, art lamps and the like. Among the above-mentioned lighting devices, traditionally most of them use tungsten filament bulbs as light sources. In recent years, light-emitting diodes (LEDs) have been used as a source of light due to advances in technology. What's more, in addition to lighting equipment, for general traffic signs, billboards, car lights, etc., light-emitting diodes are also used as light-emitting light sources instead. As mentioned above, the advantage of using light-emitting diodes as a light source is that it saves power and has higher brightness, so it has gradually become popular in use. [0003] With the popularization of LED lamps, LED lamps are used in...

AI Technical Summary

Problems solved by technology

In addition, as people's living needs change, they are no longer satisfied with the single brightness, color, and color temperature light emitted by LED lamps. Therefore, it is necessary to add a control input circuit to the circuit of LED lamps to adjust the LED in time according to user needs. The characteristic parameters of the light emitted by the lamp

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