LED dimming circuit and LED lamp

Abstract

The invention provides an LED lamp including an LED dimming circuit connected with a dimming switch. The LED dimming circuit includes a rectification filtering unit, a switch device, a switch control unit, an output unit, a sampling resistor unit and a power adjusting unit. The power adjusting unit collects wave forms of the output voltage at the output terminal of the dimming switch. When the wave forms are normal sine waves, output power of the output unit is adjusted according to on-off frequency of the output voltage meeting requirements. When the wave forms are chopping sine waves, the output power of the output unit is adjusted to be the maximum. According to the invention, by detecting the wave forms of the current flowing through the adjusting switch and judging the type of the adjusting switch according to features of different influence on current of a common switch and a silicon controlled adjusting switch, different control strategies are used for controlling the output power of the control circuit, so that the compatibility between stepless dimming and segmentation dimming is achieved.

Description

technical field

[0001] The invention relates to LED lighting technology, in particular to an LED dimming circuit and an LED lamp. Background technique

[0002] In the existing segmental dimming, a common wall switch is used to generate corresponding output power and brightness through different switching times. The circuit is implemented by using a functional circuit that can identify the number of times the switch is turned on, so that the circuit generates a corresponding output power to make the LED lamp emit different brightness. But its weakness is that the dimming is segmented, usually only 2 to 4 segments, and the brightness cannot be adjusted linearly. The advantage is that it is simple to use and install.

[0003] Existing thyristor dimming requires a special thyristor dimmer and a special power supply or light source with thyristor dimming function to cooperate with it. Its advantage is that it can realize stepless dimming, but it cannot be used in common with s...

Examples

Embodiment Construction

[0012] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0013] see figure 1 and figure 2 , the LED dimming circuit in the LED lamp in the preferred embodiment of the present invention, that is, the switching power supply, the LED dimming circuit is respectively connected to the output terminal L of the dimming switch 10 and the neutral line output terminal N, and the LED dimming circuit includes The rectification and filtering unit 100 , the switch device Q1 , the switch control unit 200 , the output unit 300 , the sampling resistor unit 400 and the power regulation unit 500 . The switching control unit 200 is a powe...

technical field

[0001] The invention relates to LED lighting technology, in particular to an LED dimming circuit and an LED lamp. Background technique

[0002] In the existing segmental dimming, a common wall switch is used to generate corresponding output power and brightness through different switching times. The circuit is implemented by using a functional circuit that can identify the number of times the switch is turned on, so that the circuit generates a corresponding output power to make the LED lamp emit different brightness. But its weakness is that the dimming is segmented, usually only 2 to 4 segments, and the brightness cannot be adjusted linearly. The advantage is that it is simple to use and install.

[0003] Existing thyristor dimming requires a special thyristor dimmer and a special power supply or light source with thyristor dimming function to cooperate with it. Its advantage is that it can realize stepless dimming, but it cannot be used in common with s...

Examples

Embodiment Construction

[0012] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0013] see figure 1 and figure 2 , the LED dimming circuit in the LED lamp in the preferred embodiment of the present invention, that is, the switching power supply, the LED dimming circuit is respectively connected to the output terminal L of the dimming switch 10 and the neutral line output terminal N, and the LED dimming circuit includes The rectification and filtering unit 100 , the switch device Q1 , the switch control unit 200 , the output unit 300 , the sampling resistor unit 400 and the power regulation unit 500 . The switching control unit 200 is a powe...

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