CN214381478U - Dimming circuit and LED drive circuit applying same - Google Patents
Dimming circuit and LED drive circuit applying same Download PDFInfo
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- CN214381478U CN214381478U CN202022853244.8U CN202022853244U CN214381478U CN 214381478 U CN214381478 U CN 214381478U CN 202022853244 U CN202022853244 U CN 202022853244U CN 214381478 U CN214381478 U CN 214381478U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model discloses a dimming circuit, include: dimming signal transmitting means for transmitting a first analog dimming electrical signal; a linear optocoupler, including a light emitter for converting the first analog dimming electrical signal into a light signal, and a light receiver for receiving the light signal and converting it into a second analog dimming electrical signal, wherein the second analog dimming electrical signal is linearly proportional to the first analog dimming electrical signal; and the LED control circuit is used for receiving the second analog dimming electric signal and using the second analog dimming electric signal for LED dimming. Utilize the utility model discloses, realized the signal conversion of the signal of the analog dimming electricity through simple and convenient technical scheme to supply to be used for LED to adjust luminance.
Description
Technical Field
The utility model relates to a power electronic technology field especially relates to a dimming circuit and use its LED drive circuit.
Background
In LED applications, there are often some scenes that require adjusting and controlling parameters such as the brightness of the LED lamp. Dimming modes of the LED include analog dimming and PWM dimming. The analog dimming is realized by changing the current in the LED loop, and the PWM dimming is also called digital dimming and achieves the effect of brightness control by turning on and off the conduction time of the forward current of the LED through PWM waves. Due to the flexibility of PWM dimming control and the abundance of dimming schemes, the dimming schemes become mainstream in engineering application, and most of the current LED dimming schemes are based on PWM dimming design.
In some scenarios, isolated dimming of LEDs is required. The existing isolation dimming scheme is to convert an analog dimming signal into a PWM signal through a converter and then transmit the PWM dimming signal to a primary side control chip through an optocoupler, thereby realizing PWM dimming. The technical scheme is complex to realize and high in cost.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a dimming circuit and a dimming method and a LED driving circuit thereof, which can realize isolated dimming of LEDs by a simple and convenient technical scheme.
In order to achieve the above object, the utility model provides a light modulation circuit, include:
a dimming signal transmitting device that transmits a first analog dimming electric signal;
a linear optocoupler, including a light emitter, receiving the first analog dimming electrical signal and converting it into an optical signal, and a light receiver, receiving the optical signal and converting it into a second analog dimming electrical signal, wherein the second analog dimming electrical signal is linearly proportional to the first analog dimming electrical signal;
and the LED control circuit receives the second analog dimming electric signal and dims the LED according to the second analog dimming electric signal.
Preferably, the optical fiber dimmer further comprises a first adjusting unit, configured to adjust the first analog dimming electrical signal before the first analog dimming electrical signal is sent to the linear optocoupler, where the adjusted first analog dimming electrical signal and the original first analog dimming electrical signal conform to a first linear relationship, and an output voltage range of the adjusted first analog dimming electrical signal conforms to an input voltage range of the linear optocoupler.
Preferably, the first adjusting unit includes a current adjusting circuit, and is configured to perform current adjustment on the first analog dimming electrical signal, where the adjusted current conforms to an input current range of the linear optocoupler.
Preferably, the first adjusting unit includes a first voltage adjusting circuit, and is configured to perform voltage adjustment on the first analog dimming electrical signal, where the adjusted voltage conforms to an input voltage range of the linear optocoupler.
Preferably, the LED lighting circuit further comprises a second adjusting unit, configured to adjust the second analog dimming electrical signal before being sent to the LED control circuit, where the adjusted second analog dimming electrical signal and the original second analog dimming electrical signal conform to a second linear relationship, and an output voltage range of the adjusted second analog dimming electrical signal conforms to a voltage range of a corresponding input terminal of the LED control circuit.
Preferably, the second adjusting unit includes a second voltage adjusting circuit, and is configured to perform voltage adjustment on the second analog dimming electrical signal, where the adjusted voltage conforms to an input voltage range of the LED control circuit.
In order to achieve the above object, the present invention also provides a LED driving circuit, which includes any one of the dimming circuits described above.
Compared with the prior art, the utility model provides a dimming circuit and dimming method and LED drive circuit thereof, the beneficial effect who brings is: through the utility model, the analog dimming electric signal is adjusted to the analog dimming electric signal which can be received by the input end of the LED control circuit, the technical scheme is simple and easy to realize, the required devices are fewer, the cost is low, the space of the plate arrangement is saved, and convenience is brought to users; the signal isolation is realized through the linear optical coupler, the performance of the product is improved, and the user safety is guaranteed.
Drawings
Fig. 1 is a system schematic of a dimming circuit in an embodiment in accordance with the present invention;
fig. 2 is a circuit schematic of a dimming circuit in an embodiment in accordance with the present invention;
fig. 3 is a circuit schematic of a dimming circuit in an embodiment in accordance with the present invention;
fig. 4 is a system diagram of an LED driver circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the specific embodiments shown in the drawings, but the embodiments are not limited to the present invention, and structural, methodological, or functional changes made by those skilled in the art according to the embodiments are included in the scope of the present invention.
In an embodiment of the present invention as shown in fig. 1, the present invention provides a light modulation circuit, including:
a dimming signal transmitting device 10 that transmits a first analog dimming electric signal;
a linear optocoupler 11, including a light emitter, receiving the first analog dimming electrical signal and converting it into an optical signal, and a light receiver, receiving the optical signal and converting it into a second analog dimming electrical signal;
and the LED control circuit 12 receives the second analog dimming electric signal and dims the LED according to the second analog dimming electric signal.
The dimming signal transmitting device transmits a first analog dimming electric signal. And inputting the first analog dimming electric signal to the linear optocoupler. Based on the principle of the linear optocoupler, a transceiver of the linear optocoupler converts the first analog dimming electric signal into an optical signal, and the optical signal is converted into a second analog dimming electric signal through a light receiver of the linear optocoupler. The analog dimming electric signal can be linearly isolated through the linear optocoupler, and the signal isolation of the analog dimming electric signal is realized. The LED control circuit is provided with an analog dimming electric signal input end, receives the second analog dimming electric signal through the input end, and transmits the second analog dimming electric signal to the primary side feedback circuit through the internal control logic of the LED control circuit, so that the dimming of the LED is realized. The linear optocoupler meets a linear relation, and the first analog dimming electric signal is converted into a second analog dimming electric signal through the linear relation, so that the voltage range of the second analog dimming electric signal meets the voltage range of the corresponding input end of the LED control circuit. The scheme does not need to carry out digital conversion on the transmitted analog dimming electric signal, reduces the circuit cost and simplifies the transmission path.
Fig. 2 illustrates a dimming circuit according to an embodiment of the present invention. The dimming circuit further comprises a first adjusting unit 13. The first adjusting unit adjusts the first analog dimming electrical signal before the first analog dimming electrical signal is sent to the linear optocoupler, wherein the adjusted first analog dimming electrical signal and the original first analog dimming electrical signal conform to a first linear relationship, the first linear relationship may be a direct proportional relationship, and an output voltage range of the adjusted first analog dimming electrical signal conforms to an input voltage range of the linear optocoupler. The voltage of the first analog dimming electric signal is adjusted to meet the input voltage range of the linear optocoupler through the first adjusting unit. According to the utility model discloses a specific embodiment, first adjustment unit includes the current adjustment circuit, is used for rightly first simulation light modulation electric signal carries out the current adjustment, and the electric current after the adjustment accords with the input current scope of linear opto-coupler. Through the current adjusting circuit, the current of the first analog dimming electric signal is increased or decreased, so that the current of the adjusted first analog dimming electric signal is correspondingly increased or decreased, the increase or decrease of the current signal meets a first linear relation, and the adjusted current conforms to the input current range of the linear optocoupler.
According to the utility model discloses a still another embodiment, first regulating unit includes first voltage control circuit, is used for rightly first analog dimming signal of telecommunication carries out voltage control, and the voltage after the adjustment accords with the input voltage scope of linear opto-coupler. Through the first voltage adjusting circuit, the voltage of the first analog dimming electric signal is increased or decreased, so that the voltage of the adjusted first analog dimming electric signal is correspondingly increased or decreased, the increase or decrease of the voltage signal meets a first linear relation, and the adjusted voltage conforms to the input voltage range of the linear optocoupler. According to the utility model discloses a specific embodiment, first voltage regulating circuit can realize the adjustment of voltage through current-limiting resistance or divider resistance. As shown in fig. 3, taking the current-limiting resistor as an example to implement voltage adjustment, the first voltage adjustment circuit includes a current-limiting resistor R1, and performs voltage adjustment on the first analog dimming electrical signal through R1, so that the adjusted voltage conforms to the input voltage range of the linear optocoupler. The value range of the current limiting resistor R1 depends on the input voltage range of the linear optocoupler.
According to an embodiment of the present invention, the dimming circuit further includes a second adjusting unit 14, as shown in fig. 2. The second adjusting unit adjusts the second analog dimming electrical signal before the second analog dimming electrical signal is sent to the LED control circuit, wherein the adjusted second analog dimming electrical signal and the original second analog dimming electrical signal conform to a second linear relationship, the second linear relationship may be a direct proportional relationship, and an output voltage range of the adjusted second analog dimming electrical signal conforms to a voltage range of a corresponding input terminal of the LED control circuit. And adjusting the voltage of the second analog dimming electric signal to meet the voltage range of the input end of the LED control circuit through the second adjusting unit. According to the utility model discloses a specific embodiment, second adjustment unit includes second voltage regulating circuit, is used for rightly the second simulation signal of adjusting luminance electricity carries out voltage control, and the voltage after the adjustment accords with LED control circuit's input voltage scope. Through the second voltage adjusting circuit, the voltage of the second analog dimming electric signal is increased or decreased, so that the voltage of the adjusted second analog dimming electric signal is correspondingly increased or decreased, the increase or decrease of the voltage signal meets a second linear relation, and the voltage range of the adjusted second analog dimming electric signal is in accordance with the voltage range of the corresponding input end of the LED control circuit. The second voltage adjusting circuit can adjust the voltage through the voltage dividing circuit. As shown in fig. 3, the voltage adjustment by the voltage dividing resistor will be described as an example. The second voltage adjusting circuit comprises a first voltage division resistor R2 and a second voltage division resistor R3, and the voltage of the adjusted second analog dimming electric signal meets the voltage range of the input end of the LED control circuit through the voltage division of R2 and R3. The value ranges of the R2 and the R3 depend on the output voltage range of the linear optocoupler, the input end voltage range of the LED control circuit and the value of the reference power supply.
According to the technical scheme, the analog dimming electric signal is adjusted into the analog dimming electric signal which can be received by the input end of the LED control circuit through the linear optocoupler, the first adjusting unit and the second adjusting unit, and the technical scheme is simple and easy to implement; meanwhile, signal isolation is realized through a linear optical coupler, and the performance of a product is improved.
Fig. 4 is a schematic circuit structure diagram of the LED driving circuit to which the dimming circuit of the present invention is applied. As shown in fig. 4, through the utility model discloses a dimming circuit truns into the second simulation signal of adjusting luminance with first simulation signal of adjusting luminance signal of electricity to with this second simulation signal of adjusting luminance signal of electricity input to LED control circuit's corresponding input, the internal control logic through LED control circuit controls the second simulation signal of adjusting luminance signal of electricity, and adopts the control mode of former limit feedback, carries out linear adjustment with the second simulation signal of adjusting luminance signal of electricity, and output constant current realizes LED's dimming function.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Claims (7)
1. A dimming circuit, comprising:
a dimming signal transmitting device that transmits a first analog dimming electric signal;
a linear optocoupler, including a light emitter, receiving the first analog dimming electrical signal and converting it into an optical signal, and a light receiver, receiving the optical signal and converting it into a second analog dimming electrical signal, wherein the second analog dimming electrical signal is linearly proportional to the first analog dimming electrical signal;
and the LED control circuit receives the second analog dimming electric signal and dims the LED according to the second analog dimming electric signal.
2. The dimming circuit of claim 1, further comprising a first adjusting unit for adjusting the first analog dimming electrical signal before it is sent to the linear optocoupler, wherein the adjusted first analog dimming electrical signal and the original first analog dimming electrical signal conform to a first linear relationship, and an output voltage range of the adjusted first analog dimming electrical signal conforms to an input voltage range of the linear optocoupler.
3. The dimming circuit of claim 2, wherein the first adjusting unit comprises a current adjusting circuit for performing current adjustment on the first analog dimming electrical signal, the adjusted current conforming to an input current range of the linear optocoupler.
4. The dimming circuit of claim 2, wherein the first adjusting unit comprises a first voltage adjusting circuit for performing voltage adjustment on the first analog dimming electrical signal, and the adjusted voltage conforms to an input voltage range of the linear optocoupler.
5. The dimming circuit of claim 1, further comprising a second adjusting unit for adjusting the second analog dimming electrical signal before being sent to the LED control circuit, wherein the adjusted second analog dimming electrical signal and the original second analog dimming electrical signal conform to a second linear relationship, and an output voltage range of the adjusted second analog dimming electrical signal conforms to a voltage range of a corresponding input terminal of the LED control circuit.
6. The dimming circuit of claim 5, wherein the second adjusting unit comprises a second voltage adjusting circuit for performing voltage adjustment on the second analog dimming electrical signal, the adjusted voltage conforming to the input voltage range of the LED control circuit.
7. An LED driving circuit comprising the dimming circuit of any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022853244.8U CN214381478U (en) | 2020-12-02 | 2020-12-02 | Dimming circuit and LED drive circuit applying same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022853244.8U CN214381478U (en) | 2020-12-02 | 2020-12-02 | Dimming circuit and LED drive circuit applying same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214381478U true CN214381478U (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022853244.8U Active CN214381478U (en) | 2020-12-02 | 2020-12-02 | Dimming circuit and LED drive circuit applying same |
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| Country | Link |
|---|---|
| CN (1) | CN214381478U (en) |
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2020
- 2020-12-02 CN CN202022853244.8U patent/CN214381478U/en active Active
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