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Narrow voltage LED lamp switch dimming drive circuit and LED lamp dimming control system

A LED lamp, dimming drive technology, applied in the direction of lamp circuit layout, electric light source, energy-saving control technology, etc., can solve the inconvenience of dimming operation of multiple LED lamps, difficulty in effective dimming, dimming circuit cannot adapt to LED lamps, etc. question

Inactive Publication Date: 2017-01-18
NANKER GUANGZHOU SEMICON MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is also a need for dimming LED lights, but due to the particularity of LED lights, traditional dimming circuits often cannot adapt to LED lights
figure 1 , figure 2 Shown are the drive circuits of two narrow-voltage LED lamps developed by the applicant. Since there are different numbers of LEDs corresponding to the standard mains voltage in different countries or regions, this kind of LED lamp is called a narrow-voltage LED lamp. Its drive circuit mainly includes protection circuit 11, rectification circuit 12, filter circuit 13, constant current circuit 14 and light source circuit 15, figure 2 The drive circuit also protects the fan circuit 16. The above-mentioned LED lights can only work with the dimmer when the output voltage of the dimmer is adjustable within a small range. When the output voltage of the dimmer is lower than the total turn-on voltage of the LED , the output power of the LED lamp is almost zero, so it is difficult for this narrow voltage LED lamp to be dimmed effectively with the existing dimmer
In addition, most of the existing dimmers are set for a single lamp, especially for LED lamps, there is no system for dimming and controlling multiple LED lamps at the same time, so the dimming operation for multiple LED lamps is inconvenient

Method used

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  • Narrow voltage LED lamp switch dimming drive circuit and LED lamp dimming control system
  • Narrow voltage LED lamp switch dimming drive circuit and LED lamp dimming control system
  • Narrow voltage LED lamp switch dimming drive circuit and LED lamp dimming control system

Examples

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Embodiment 1

[0033] Such as image 3 , Figure 5 , Image 6 As shown, this embodiment is a switching and dimming drive circuit for a narrow voltage LED lamp, which is embedded in the LED lamp and includes an overcurrent protection circuit 1, which is used to change the alternating current of the power supply into direct current and provide driving for the LED light source circuit 5. A voltage rectification circuit 2, a filter circuit 3 for filtering the output current of the rectification circuit 2, a pulse width modulation circuit 7 for generating pulse signals and adjusting pulse width duty ratios, for responding to the pulse width modulation The circuit 7 outputs a pulse signal and provides a PWM switch circuit 8 for periodic pulse output to the LED light source circuit 5, a constant current source circuit 4 for stabilizing voltage and current of the LED light source circuit 5, and the overcurrent protection The circuit 1 is connected to the input terminal of the neutral line of the p...

Embodiment 2

[0037] Such as Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that in this embodiment, the constant current source circuit 4 is an N-channel junction field effect transistor (J-FET) Q1a, and the N-channel junction field effect transistor (J-FET) Q1a is The drain of the field effect transistor Q1a is a contact, and the source and the gate of the N-channel junction field-effect transistor Q1a are short-circuited to form another contact, that is, the present embodiment uses an N-channel junction field-effect transistor instead of implementing The N-channel depletion-type field-effect transistor in Example 1 has the same function and effect; in addition, the switching and dimming driving circuit of the narrow voltage LED lamp also includes a cooling fan circuit 9, and the cooling fan circuit 9 Connected in series with the LED light source circuit 5 and the constant current source circuit 4 , the cooling fan circuit 9 includes a lighting fan motor DM...

Embodiment 3

[0040] Such as Figure 7 As shown, this embodiment is a dimming control system for LED lamps, including several parallel LED lamps DS1, DS2, ..., DS(n) and a shared power switch S0, each of the LED lamps DS1, DS2 , ..., DS(n) all include the switching and dimming driving circuit of the narrow voltage LED lamp in the first embodiment, through the power switch S0, each of the LED lamps DS1, DS2, ..., DS(n) Perform dimming control. Therefore, the LED lamp dimming control system of this embodiment can conveniently perform large-scale synchronous dimming of multiple LED lamps without a dimmer, which is conducive to saving electric energy, and is especially suitable for LED lights in large places such as cinemas and gymnasiums. Lamp dimming operation.

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Abstract

The invention discloses a switch light-dimming drive circuit of a narrow-voltage LED lamp and a light-dimming control system of the LED lamp. The light-dimming control system comprises a plurality of LED lamps connected in parallel and a common power supply switch (S0), wherein each LED lamp comprises the switch light-dimming drive circuit, and the power supply switch (S0) is used for simultaneously carrying out light-dimming on the LED lamps. The switch light-dimming drive circuit comprises an LED light source circuit (5), a rectifier circuit (5), a filter circuit (3), a pulse width modulation (PWM) circuit (7), a PWM switch circuit (8) and constant-current source circuits (4), wherein the constant-current source circuits (4) are connected in series and connected to an output end of the PWM switch circuit (8); after current is input from a power supply, rectified and filtered, a pulse switching signal is generated through the PWM switch (7); under the control of on-off times of a power supply switch circuit (6), a pulse switching signal of the PWM circuit (7) has different duty ratios; the PWM switch circuit (8) provides time-sharing switching current for the LED light source circuit (5) to perform power control and light-dimming on the LED light source circuit (5). The light-dimming control system can be applied to the field of light-dimming of LED lamps.

Description

technical field [0001] The invention relates to a switch dimming driving circuit of a narrow voltage LED lamp. In addition, the present invention also relates to an LED lamp dimming control system. Background technique [0002] At present, the application of LEDs is becoming more and more extensive, and LED lamps for daily indoor and outdoor lighting are also becoming more and more popular. Traditional incandescent lamps and fluorescent lamps can be configured with dimmers for dimming, and the output illuminance of the lights can be adjusted to meet people's needs. There is also a need for dimming LED lights, but due to the particularity of LED lights, traditional dimming circuits often cannot adapt to LED lights. figure 1 , figure 2 Shown are the drive circuits of two narrow-voltage LED lamps developed by the applicant. Since there are different numbers of LEDs corresponding to the standard mains voltage in different countries or regions, this kind of LED lamp is called...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
CPCY02B20/40
Inventor 吴俊纬
Owner NANKER GUANGZHOU SEMICON MFG