CN211930925U - PWM dimming circuit and LED light source using same - Google Patents
PWM dimming circuit and LED light source using same Download PDFInfo
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- CN211930925U CN211930925U CN202020985744.4U CN202020985744U CN211930925U CN 211930925 U CN211930925 U CN 211930925U CN 202020985744 U CN202020985744 U CN 202020985744U CN 211930925 U CN211930925 U CN 211930925U
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Abstract
The utility model relates to a PWM dimmer circuit is connected with LED, and PWM dimmer circuit includes: inputting a PWM signal with adjustable duty ratio, and converting the PWM signal into an MOS tube or a triode corresponding to the output of the constant current signal; and the constant current driving control chip is respectively connected with the MOS tube or the triode and the LED and outputs a dimming driving signal for driving the LED to perform dimming based on the input constant current signal. The utility model discloses still relate to a LED light source, it includes one or more LED, aforementioned PWM dimmer circuit. The utility model discloses can realize PWM and adjust luminance, and the cost is reduced, the circuit is simple reliable, has saved the space that required occupy.
Description
Technical Field
The utility model relates to the field of lighting technology, concretely relates to PWM dimmer circuit and use its LED light source.
Background
In the current general lighting field, for dimming of LEDs, the following scheme is generally used: 1. an LED linear constant current driving chip is adopted, the chip does not have a PWM signal compatible function, and dimming can not be realized by utilizing PWM signals; 2. the linear driving chip capable of realizing PWM dimming is adopted, and the chip is expensive.
Disclosure of Invention
The utility model aims at providing an utilize PWM to realize adjusting luminance, and the cost is lower, the simple easy PWM dimmer circuit who uses of circuit.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a PWM dimming circuit connected to an LED, the PWM dimming circuit comprising:
inputting a PWM signal with adjustable duty ratio, and converting the PWM signal into an MOS tube or a triode corresponding to a constant current signal for output;
and the constant current driving control chip is respectively connected with the MOS tube or the triode and the LED and outputs a dimming driving signal for driving the LED to perform dimming based on the input constant current signal.
The MOS tube is an N-channel MOS tube, and the triode is an NPN triode.
The PWM signal is connected to a grid electrode of the MOS tube or a base electrode of the triode, a drain electrode of the MOS tube or a collector electrode of the triode is connected with the constant current drive control chip, and a source electrode of the MOS tube or an emitting electrode of the triode is grounded.
And the drain electrode of the MOS tube or the collector electrode of the triode is connected with the constant current drive control chip through a resistor.
The constant current driving control chip is a single-channel or multi-channel constant current driving control chip.
The utility model also provides an utilize PWM to realize adjusting luminance, and the LED light source that the cost is lower, the circuit is simple easy to use, its technical scheme is:
an LED light source comprises one or more LEDs and the PWM dimming circuit.
A plurality of the LEDs are connected in series.
And the cathode of the LED is connected with the constant current drive control chip.
The LED light source also comprises a power supply module connected with the LED.
The power module comprises an energy storage capacitor.
Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages: the utility model discloses can realize PWM and adjust luminance, and the cost is reduced, the circuit is simple reliable, has saved the space that required occupy.
Drawings
Fig. 1 is a circuit diagram of the LED light source of the present invention.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings.
The first embodiment is as follows: as shown in fig. 1, an LED light source includes a power module, one or more LEDs, and a PWM dimming circuit.
In the embodiment, n LEDs are arranged, namely D1-Dn, and after the n LEDs are sequentially connected in series, the anode of each LED is connected with a power supply module, and the cathode of each LED is connected with a PWM dimming circuit. The power module comprises an energy storage capacitor C.
The PWM dimming circuit comprises a MOS tube or a triode Q1 and a constant current driving control chip U1. The constant current driving control chip U1 is respectively connected with the MOS tube or the triode Q1 and the cathode of the LED.
The MOS tube or the triode Q1 inputs a PWM signal with adjustable duty ratio and is used for converting the PWM signal into a corresponding constant current signal and outputting the constant current signal. The MOS transistor Q1 is an N-channel MOS transistor, the triode Q1 is an NPN triode, the PWM signal is connected to the grid electrode of the MOS transistor Q1 or the base electrode of the triode Q1, the drain electrode of the MOS transistor Q1 or the collector electrode of the triode Q1 is connected with the constant current drive control chip U1 through a resistor Rcs, and the source electrode of the MOS transistor Q1 or the emitter electrode of the triode Q1 is grounded.
The constant current drive control chip U1 outputs a dimming drive signal for driving the LEDs to dim based on the input constant current signal. The driving circuit is a single-channel or multi-channel constant current driving control chip.
The amplitude of the PWM signal input by the grid of the MOS tube Q1 or the base of the triode Q1 is fixed, and the duty ratio of the PWM signal is adjusted according to needs, so that the current output by the constant current drive control chip U1 and flowing through the LED linearly changes, and the effects of driving an LED switch and adjusting the LED brightness are achieved.
Not enough that can not directly adjust luminance with PWM to current general LED illumination linear driving platform, the utility model provides an interface circuit of PWM and general electronic drive platform. According to the scheme, the current setting pin of the common linear constant current driving chip is controlled through the switch modulation technology, and the PWM dimming effect is achieved. PWM dimming is realized to this function, and it is general to have realized that the electronic drive platform of intelligent illumination dimming and non-intelligent general illumination is general, has reduced the cost simultaneously and has saved the space.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (10)
1. A PWM dimming circuit is connected with an LED, and is characterized in that: the PWM dimming circuit includes:
inputting a PWM signal with adjustable duty ratio, and converting the PWM signal into an MOS tube or a triode corresponding to a constant current signal for output;
and the constant current driving control chip is respectively connected with the MOS tube or the triode and the LED and outputs a dimming driving signal for driving the LED to perform dimming based on the input constant current signal.
2. The PWM dimming circuit according to claim 1, wherein: the MOS tube is an N-channel MOS tube, and the triode is an NPN triode.
3. The PWM dimming circuit according to claim 1, wherein: the PWM signal is connected to a grid electrode of the MOS tube or a base electrode of the triode, a drain electrode of the MOS tube or a collector electrode of the triode is connected with the constant current drive control chip, and a source electrode of the MOS tube or an emitting electrode of the triode is grounded.
4. A PWM dimming circuit according to claim 3, wherein: and the drain electrode of the MOS tube or the collector electrode of the triode is connected with the constant current drive control chip through a resistor.
5. The PWM dimming circuit according to claim 1, wherein: the constant current driving control chip is a single-channel or multi-channel constant current driving control chip.
6. An LED light source comprising one or more LEDs, characterized in that: the LED light source further comprises a PWM dimming circuit as claimed in any one of claims 1 to 5.
7. The LED light source of claim 6, wherein: a plurality of the LEDs are connected in series.
8. The LED light source of claim 6, wherein: and the cathode of the LED is connected with the constant current drive control chip.
9. The LED light source of claim 6, wherein: the LED light source also comprises a power supply module connected with the LED.
10. The LED light source of claim 9, wherein: the power module comprises an energy storage capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020985744.4U CN211930925U (en) | 2020-06-02 | 2020-06-02 | PWM dimming circuit and LED light source using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020985744.4U CN211930925U (en) | 2020-06-02 | 2020-06-02 | PWM dimming circuit and LED light source using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211930925U true CN211930925U (en) | 2020-11-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020985744.4U Active CN211930925U (en) | 2020-06-02 | 2020-06-02 | PWM dimming circuit and LED light source using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211930925U (en) |
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2020
- 2020-06-02 CN CN202020985744.4U patent/CN211930925U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 215400 No. 33 East Qingdao Road, Taicang Economic Development Zone, Suzhou City, Jiangsu Province Patentee after: Hongyibai Lighting Co.,Ltd. Address before: 215400 No. 33 East Qingdao Road, Taicang Economic Development Zone, Suzhou City, Jiangsu Province Patentee before: RED100 LIGHTING CO.,LTD. |
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| CP01 | Change in the name or title of a patent holder |