CN211930932U - LED lamp constant current drive circuit and lamp - Google Patents
LED lamp constant current drive circuit and lamp Download PDFInfo
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- CN211930932U CN211930932U CN202020357867.3U CN202020357867U CN211930932U CN 211930932 U CN211930932 U CN 211930932U CN 202020357867 U CN202020357867 U CN 202020357867U CN 211930932 U CN211930932 U CN 211930932U
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Abstract
The application relates to a LED lamp constant current drive circuit and lamps and lanterns, the circuit includes: the control circuit is used for receiving a control signal issued by the host computer, decoding the control signal and outputting a dimming signal; the constant voltage drop circuit is used for converting the mains voltage into the load voltage of the first LED lamp; and the constant current circuit is used for dimming the first LED lamp according to the dimming signal under the load voltage output by the constant voltage drop circuit. Based on above-mentioned LED lamp constant current drive circuit for the LED lamp drive control and provide invariable current source, prevent that the LED lamp from leading to the damage because power supply voltage difference is too big.
Description
Technical Field
The application relates to the technical field of LED lamps, in particular to a constant current driving circuit of an LED lamp and a lamp.
Background
The LED is a solid semiconductor device, which utilizes current flowing in the forward direction to the pn junction coupling of the semiconductor, and then two carriers, namely negatively charged electrons and positively charged holes separated in the semiconductor, are combined with each other to generate photon emission, and different types of LEDs can emit light with different wavelengths from infrared to blue light, and from violet to ultraviolet light. Recent new development is to coat fluorescent powder on a blue LED to convert the blue LED into a white LED product. This operation generally requires a driver circuit (LED driver) or power supply (PowerSupply), which mainly functions to convert ac voltage into dc power and simultaneously complete the voltage and current corresponding to the LEDs to drive the mating components. The LED lamps in the current market have different power, the LED lamps with smaller power cannot be directly connected with a power supply, and the LED lamps cannot normally work due to overlarge power supply pressure difference.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the application provides an LED lamp constant current driving circuit and a lamp.
In a first aspect, the present application provides an LED lamp constant current driving circuit, including:
the control circuit is used for receiving a control signal issued by the host computer, decoding the control signal and outputting a dimming signal;
the constant voltage drop circuit is used for converting the mains voltage into the load voltage of the first LED lamp;
and the constant current circuit is used for dimming the first LED lamp according to the dimming signal under the load voltage output by the constant voltage drop circuit.
Optionally, the control circuit includes a decoding chip, and the decoding chip receives the DMX512 control signal sent by the host, decodes the control signal, and outputs a multi-channel PWM dimming signal.
Optionally, the constant voltage drop circuit includes a voltage drop chip and a constant voltage circuit, the voltage drop chip converts the commercial power into a load voltage of the first LED lamp, and the load voltage is output to the constant current circuit after being stabilized by the constant voltage circuit.
Optionally, the constant current circuit includes a driving control chip, a power input end of the driving control chip is connected with the constant voltage drop circuit through a voltage dependent resistor, the power input end of the driving control chip is grounded through a capacitor, a control signal receiving end of the driving control chip is connected with the control circuit through a voltage dividing resistor, a sampling end of the driving control chip is grounded through a sampling resistor, and a signal output end of the driving control chip is connected with the first LED lamp.
Optionally, the control circuit is further connected to a second LED lamp through an external port, and the load voltage of the first LED lamp is smaller than the load voltage of the second LED lamp.
In a second aspect, this embodiment provides a lamp, where the lamp includes a first LED lamp and an LED lamp constant current driving circuit for providing a stable voltage to the first LED lamp, and the LED lamp constant current driving circuit includes:
the control circuit is used for receiving a control signal issued by the host computer, decoding the control signal and outputting a dimming signal;
the constant voltage drop circuit is used for converting the mains voltage into the load voltage of the first LED lamp;
and the constant current circuit is used for dimming the first LED lamp according to the dimming signal under the load voltage output by the constant voltage drop circuit.
Optionally, the control circuit includes a decoding chip, and the decoding chip receives the DMX512 control signal sent by the host, decodes the control signal, and outputs a multi-channel PWM dimming signal.
Optionally, the constant voltage drop circuit includes a voltage drop chip and a constant voltage circuit, the voltage drop chip converts the commercial power into a load voltage of the first LED lamp, and the load voltage is output to the constant current circuit after being stabilized by the constant voltage circuit.
Optionally, the constant current circuit includes a driving control chip, a power input end of the driving control chip is connected with the constant voltage drop circuit through a voltage dependent resistor, the power input end of the driving control chip is grounded through a capacitor, a control signal receiving end of the driving control chip is connected with the control circuit through a voltage dividing resistor, a sampling end of the driving control chip is grounded through a sampling resistor, and a signal output end of the driving control chip is connected with the first LED lamp.
Optionally, the lamp further includes a second LED lamp, the control circuit is further connected to the second LED lamp through an external port, and the load voltage of the first LED lamp is smaller than the load voltage of the second LED lamp.
The utility model has the advantages that:
the utility model discloses a LED lamp constant current drive circuit and lamps and lanterns, the circuit includes: the control circuit is used for receiving a control signal issued by the host computer, decoding the control signal and outputting a dimming signal; the constant voltage drop circuit is used for converting the mains voltage into the load voltage of the first LED lamp; and the constant current circuit is used for dimming the first LED lamp according to the dimming signal under the load voltage output by the constant voltage drop circuit. Based on above-mentioned LED lamp constant current drive circuit for the LED lamp drive control and provide invariable current source, prevent that the LED lamp from leading to the damage because power supply voltage difference is too big.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
FIG. 1 is a schematic flow chart of an LED lamp constant current driving circuit according to an embodiment;
FIG. 2 is a schematic diagram of a control circuit in one embodiment;
FIG. 3 is a schematic diagram of a constant voltage drop circuit in one embodiment;
fig. 4 is a schematic diagram of a constant current circuit in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic flow diagram of an embodiment of a constant current driving circuit for an LED lamp, in the embodiment of the present invention, referring to fig. 1, a constant current driving circuit for an LED lamp, the circuit includes:
the control circuit 110 is configured to receive a control signal sent by a host, decode the control signal, and output a dimming signal;
a constant voltage drop circuit 120, configured to convert the mains voltage into a load voltage of the first LED lamp;
and the constant current circuit 130 is configured to dim the first LED lamp according to the dimming signal under the load voltage output by the constant voltage drop circuit 120.
The circuit comprises: the control circuit 110 is configured to receive a control signal sent by a host, decode the control signal, and output a dimming signal; a constant voltage drop circuit 120, configured to convert the mains voltage into a load voltage of the first LED lamp; and the constant current circuit 130 is configured to dim the first LED lamp according to the dimming signal under the load voltage output by the constant voltage drop circuit 120. Based on above-mentioned LED lamp constant current drive circuit for the LED lamp drive control and provide invariable current source, prevent that the LED lamp from leading to the damage because power supply voltage difference is too big.
In an embodiment, fig. 2 is a schematic diagram of a control circuit in an embodiment, and referring to fig. 2, the control circuit 110 includes a decoding chip, where the decoding chip receives a DMX512 control signal sent by the host, decodes the control signal, and outputs a multi-channel PWM dimming signal.
Specifically, the control circuit 110 includes a decoding chip with a model SM16522, and a 485 interface chip is built in the decoding chip, and is configured to receive a DMX512 control signal, decode the DMX512 control signal, and output a multi-channel PWM dimming signal, thereby implementing dimming control on the LED lamp. As shown in fig. 2, pins 1, 2, and 3 of the decoding chip are respectively connected with a resistor, pin 7 of the decoding chip is connected with a power supply VCC1 through a resistor RV1, pin 7 of the decoding chip is also connected with a power supply VDD through a resistor RJ, a capacitor C3 is connected between pin 7 and pin 8 of the decoding chip, pin 7 of the decoding chip is grounded through a capacitor C3, pin 8 of the decoding chip is directly grounded, PWM control signals are sent to the constant current circuit 130 through pins 9, 13, 14, and 15 of the decoding chip, pins 9, 13, 14, and 15 of the decoding chip respectively correspond to a constant current circuit 130, each constant current circuit 130 corresponds to an LED lamp, and dimming control of the LED lamp is realized through the constant current circuit 130.
In an embodiment, fig. 3 is a schematic diagram of a constant voltage drop circuit in an embodiment, and referring to fig. 3, the constant voltage drop circuit 120 includes a voltage drop chip and a constant voltage circuit, the voltage drop chip converts a commercial power into a load voltage of the first LED lamp, and the load voltage is stabilized by the constant voltage circuit and then output to the constant current circuit 130.
Specifically, the constant voltage drop circuit 120 includes a voltage drop chip of model XL4301, the constant voltage circuit serves as a peripheral circuit of the voltage drop chip, and as shown in fig. 3, the constant voltage circuit includes a resistor R1, a resistor R2, a resistor RCS, an inductor L1, an electrolytic capacitor EC1, an electrolytic capacitor EC2, a transient suppression diode DT1, a capacitor C1, a capacitor C2, a capacitor C8, a diode D1, and a diode D2.
The first end of the resistor R1 is connected with a power supply VDD, the first end of the resistor R1 is also connected with the first end of the inductor L1, and the second end of the resistor R1 is grounded through the resistor R2.
The first end of the electrolytic capacitor EC1 is connected with a power supply VDD, the first end of the electrolytic capacitor EC1 is also connected with the first end of an inductor L1, and the second end of the electrolytic capacitor EC1 is grounded.
The first end of the capacitor C8 is connected with a power supply VDD, the first end of the capacitor C8 is also connected with the first end of the inductor L1, and the second end of the capacitor C8 is grounded.
The second terminal of the inductor L1 is grounded through a diode D2, and the second terminal of the inductor L1 is also connected to pin No. 2 of the buck chip.
No. 5 pin of step-down chip is through resistance RCS ground connection, it has electric capacity C1 to have connect between No. 7 pin and the No. 8 pin of step-down chip, No. 8 pin of step-down chip still is through electric capacity C2 ground connection, No. 8 pin of step-down chip still is through electrolytic capacitor EC1 ground connection, No. 8 pin of step-down chip still links to each other with the power VCC through diode D1, the power VCC still suppresses diode DT1 ground connection through the transient state.
Constitute the step-down voltage conversion through step-down chip and constant voltage circuit, convert input voltage VCC into VDD and provide load voltage for LED, provide chip drive voltage for decoding the chip, be equipped with the FB sampling point between resistance R1 and the resistance R2, through the size of the resistance adjustment output voltage of adjusting resistance R1 and resistance R2, be applicable to the LED lamp of different power.
In an embodiment, fig. 4 is a schematic diagram of a constant current circuit in an embodiment, and referring to fig. 4, the constant current circuit 130 includes a driving control chip, a power input end of the driving control chip is connected to the constant voltage drop circuit 120 through a voltage dependent resistor, the power input end of the driving control chip is further grounded through a capacitor, a control signal receiving end of the driving control chip is connected to the control circuit 110 through a voltage dividing resistor, a sampling end of the driving control chip is grounded through a sampling resistor, and a signal output end of the driving control chip is connected to the first LED lamp.
Specifically, the constant current circuit 130 includes a driving control chip of a model SML15633, as shown in fig. 4, a first pin of the driving control chip is connected to the output voltage VDD of the constant voltage drop circuit 120 through a resistor RV2, the first pin of the driving control chip is further grounded through a capacitor C4, a third pin of the driving control chip is connected to the pin 9, the pin 13, the pin 14, or the pin 15 of the decoding chip through a resistor RR1, a fourth pin of the driving control chip is grounded through a resistor RS1, and a fifth pin, a sixth pin, and a seventh pin of the driving control chip are connected to one point and then connected to the LED lamp R, LED, the lamp G, LED, or the LED lamp W. The PWM signals into the constant current circuit 130 implement OUT1/2/3 port dimming, respectively. And the LED power chip SM15633E embeds the excess temperature protect function, reduces output current when inside temperature reaches the excess temperature guard point, promotes system operational reliability, promotes the security when the LED lamps and lanterns use.
In one embodiment, referring to fig. 2, the control circuit 110 is further connected to a second LED lamp via an external port, and the load voltage of the first LED lamp is less than the load voltage of the second LED lamp.
Specifically, as shown in fig. 2, pin 6 of the decoding chip is connected to an external port through a resistor RAD, and is connected to the LED lamp through the external port, so that the decoding chip is suitable for the LED lamp with high power.
In one embodiment, the present embodiment provides a lamp including a first LED lamp and an LED lamp constant current driving circuit for providing a stable voltage to the first LED lamp, where the LED lamp constant current driving circuit includes:
the control circuit 110 is configured to receive a control signal sent by a host, decode the control signal, and output a dimming signal;
a constant voltage drop circuit 120, configured to convert the mains voltage into a load voltage of the first LED lamp;
and the constant current circuit 130 is configured to dim the first LED lamp according to the dimming signal under the load voltage output by the constant voltage drop circuit 120.
In an embodiment, the control circuit 110 includes a decoding chip, and the decoding chip receives the DMX512 control signal sent by the host, decodes the control signal, and outputs a multi-channel PWM dimming signal.
In one embodiment, the constant voltage dropping circuit 120 includes a voltage dropping chip and a constant voltage circuit, the voltage dropping chip converts the commercial power into a load voltage of the first LED lamp, and the load voltage is stabilized by the constant voltage circuit and then output to the constant current circuit 130.
In one embodiment, the constant current circuit 130 includes a driving control chip, a power input terminal of the driving control chip is connected to the constant voltage drop circuit 120 through a voltage dependent resistor, the power input terminal of the driving control chip is further grounded through a capacitor, a control signal receiving terminal of the driving control chip is connected to the control circuit 110 through a voltage dividing resistor, a sampling terminal of the driving control chip is grounded through a sampling resistor, and a signal output terminal of the driving control chip is connected to the first LED lamp.
In one embodiment, the lamp further includes a second LED lamp, and the control circuit 110 is further connected to the second LED lamp through an external port, and the load voltage of the first LED lamp is smaller than the load voltage of the second LED lamp.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, circuit, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, circuit, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, circuit, article, or apparatus that comprises the element.
The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A constant current driving circuit of an LED lamp is characterized by comprising:
the control circuit is used for receiving a control signal issued by the host computer, decoding the control signal and outputting a dimming signal;
the constant voltage drop circuit is used for converting the mains voltage into the load voltage of the first LED lamp;
and the constant current circuit is used for dimming the first LED lamp according to the dimming signal under the load voltage output by the constant voltage drop circuit.
2. The circuit of claim 1, wherein the control circuit comprises a decoding chip, and the decoding chip receives the DMX512 control signal sent by the host, decodes the control signal, and outputs multiple PWM dimming signals.
3. The circuit of claim 1, wherein the constant voltage drop circuit comprises a voltage drop chip and a constant voltage circuit, the voltage drop chip converts the commercial power into a load voltage of the first LED lamp, and the load voltage is stabilized by the constant voltage circuit and then output to the constant current circuit.
4. The circuit of claim 1, wherein the constant current circuit comprises a driving control chip, a power input terminal of the driving control chip is connected to the constant voltage drop circuit through a voltage dependent resistor, the power input terminal of the driving control chip is further grounded through a capacitor, a control signal receiving terminal of the driving control chip is connected to the control circuit through a voltage dividing resistor, a sampling terminal of the driving control chip is grounded through a sampling resistor, and a signal output terminal of the driving control chip is connected to the first LED lamp.
5. The circuit of claim 1, wherein the control circuit is further connected to a second LED lamp via an external port, and wherein a load voltage of the first LED lamp is less than a load voltage of the second LED lamp.
6. The lamp is characterized by comprising a first LED lamp and an LED lamp constant current driving circuit for providing stable voltage for the first LED lamp, wherein the LED lamp constant current driving circuit comprises:
the control circuit is used for receiving a control signal issued by the host computer, decoding the control signal and outputting a dimming signal;
the constant voltage drop circuit is used for converting the mains voltage into the load voltage of the first LED lamp;
and the constant current circuit is used for dimming the first LED lamp according to the dimming signal under the load voltage output by the constant voltage drop circuit.
7. The lamp according to claim 6, wherein the control circuit comprises a decoding chip, and the decoding chip receives the DMX512 control signal sent by the host, decodes the control signal, and outputs a plurality of PWM dimming signals.
8. The lamp of claim 6, wherein the constant voltage drop circuit comprises a voltage drop chip and a constant voltage circuit, the voltage drop chip converts the commercial power into a load voltage of the first LED lamp, and the load voltage is stabilized by the constant voltage circuit and then output to the constant current circuit.
9. The lamp according to claim 6, wherein the constant current circuit comprises a driving control chip, a power input terminal of the driving control chip is connected with the constant voltage drop circuit through a voltage dependent resistor, the power input terminal of the driving control chip is grounded through a capacitor, a control signal receiving terminal of the driving control chip is connected with the control circuit through a voltage dividing resistor, a sampling terminal of the driving control chip is grounded through a sampling resistor, and a signal output terminal of the driving control chip is connected with the first LED lamp.
10. The lamp of claim 6, further comprising a second LED lamp, wherein the control circuit is further connected to the second LED lamp via an external port, and wherein the load voltage of the first LED lamp is less than the load voltage of the second LED lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020357867.3U CN211930932U (en) | 2020-03-19 | 2020-03-19 | LED lamp constant current drive circuit and lamp |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020357867.3U CN211930932U (en) | 2020-03-19 | 2020-03-19 | LED lamp constant current drive circuit and lamp |
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| CN211930932U true CN211930932U (en) | 2020-11-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113966025A (en) * | 2021-10-26 | 2022-01-21 | 深圳市紫光照明技术股份有限公司 | Dimming method, dimming controller and dimming control system |
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2020
- 2020-03-19 CN CN202020357867.3U patent/CN211930932U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113966025A (en) * | 2021-10-26 | 2022-01-21 | 深圳市紫光照明技术股份有限公司 | Dimming method, dimming controller and dimming control system |
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