Device for controlling illuminating lamp to be brightened gradually and refrigerator with device

Abstract

The invention discloses a device for controlling an illuminating lamp to be brightened gradually and a refrigerator with the device, and relates to the field of household appliances. The device comprises a power supply circuit, an amplifying circuit, a filter circuit and the illuminating lamp in sequential connection. The power supply circuit is used for providing current and voltage output; the amplifying circuit is used for amplifying PWM (pulse width modulation) signals and then outputting the amplified PWM signals to the filter circuit; the filter circuit is used for filtering the amplified PWM signals to obtain direct current, and outputting the direct current to the illuminating lamp. The device for controlling the illuminating lamp to be brightened gradually has the advantages that the PWM signals are subjected to two-stage amplification and then filtered to obtain the direct current with duty cycle gradually increased, and the direct current is supplied to the LED illuminating lamp, so that effect of gradually brightening the illuminating lamp is achieved with lower cost, and the device has broad application prospect in the refrigerator and other household appliances.

Description

technical field [0001] The invention relates to the technical field of home appliances, in particular to a device for controlling the gradual brightness of an illuminating lamp and a refrigerator including the device. Background technique [0002] In the field of home appliances, such as electronic refrigerators, most of the DC lighting controls use relays or triodes to directly control the conduction of the power supply to realize the switch of the lights, and cannot realize the function of gradually brightening. A small number of home appliances use PWM (Pulse Width Modulation, pulse width modulation) to control the constant current source to achieve fading, but this method is costly and complicated to implement. [0003] figure 1 It is an existing control circuit diagram that uses PWM to control the constant current source to realize the gradual lighting of the lighting. At present, most of the high-end electronic refrigerators use this kind of control circuit to gradual...

AI Technical Summary

Problems solved by technology

This kind of circuit must use a high-cost control chip, so it is difficult to widely promote it in more refrigerators and other home appliances

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