CN216905371U - DC double-circuit PWM LED drive circuit that adjusts luminance - Google Patents

DC double-circuit PWM LED drive circuit that adjusts luminance Download PDF

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Publication number
CN216905371U
CN216905371U CN202220146926.1U CN202220146926U CN216905371U CN 216905371 U CN216905371 U CN 216905371U CN 202220146926 U CN202220146926 U CN 202220146926U CN 216905371 U CN216905371 U CN 216905371U
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China
Prior art keywords
module
circuit
main control
led
pin
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CN202220146926.1U
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Chinese (zh)
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刘学棠
李茂城
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Jiangxi Huabo Energy Saving Lighting Technology Collaborative Innovation Co ltd
Jiangxi Top Quantum Lighting Tech Co ltd
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Jiangxi Huabo Energy Saving Lighting Technology Collaborative Innovation Co ltd
Jiangxi Top Quantum Lighting Tech Co ltd
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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 DC double-circuit PWM dimming LED drive circuit, which relates to the field of LEDs and comprises: the power supply module is used for supplying direct current; the safety module is used for protecting the circuit and is disconnected when the circuit current is overlarge; the filtering module is used for filtering the direct current; the IC master control module is used for comprehensively controlling the circuit; the high-frequency switch module is used for outputting high-frequency direct current; the output filtering module is used for filtering the high-frequency direct current and outputting the high-frequency direct current to the LED double-path working module; compared with the prior art, the utility model has the beneficial effects that: the input/output voltage range of the utility model can reach 3-37VDC, and the utility model has wide application places; the circuit supports lithium batteries and USB power supply; the light can be bright and dark, and can be adjusted at will through the PWN duty ratio, and the cold and warm colors and temperatures can be accurately adjusted; the whole-course dimming is free of stroboflash with the dimming depth as low as 1%, two ways of linear dimming of the IC main control module are simple, the IC peripheral circuit is simple, photoelectric integration is achieved, and an external power supply is not needed.

Description

DC double-circuit PWM LED drive circuit of adjusting luminance
Technical Field
The utility model relates to the field of LEDs, in particular to a DC double-path PWM dimming LED driving circuit.
Background
LED (Light Emitting Diode) lighting has been widely used, and contributes to energy saving for society.
With the popularization of the application of the LED, direct-current low-voltage LEDs are required in more and more occasions, the requirements for dimming and color mixing of the LEDs are different, and the LED lamp produced at present can emit constant light after being plugged, so that improvement is needed.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a DC dual-path PWM dimming LED driving circuit to solve the problems of the prior art.
In order to achieve the purpose, the utility model provides the following technical scheme:
a DC dual-PWM dimming LED drive circuit, comprising:
the power supply module is used for supplying direct current;
the safety module is used for protecting the circuit and is disconnected when the circuit current is overlarge;
the filtering module is used for filtering the direct current;
the IC main control module is used for comprehensively controlling the circuit;
the high-frequency switch module is used for outputting high-frequency direct current;
the output filtering module is used for filtering the high-frequency direct current and outputting the high-frequency direct current to the LED double-path working module;
the LED double-path working module is used for receiving the control of the IC main control module and controlling the LED to emit light;
the output current module is used for receiving the control of the IC main control module and controlling the working current of the LED double-path working module;
the PWM dimming module is used for outputting a double-path PWM signal to the IC main control module, and the IC main control module controls the LED light-emitting condition of the LED double-path working module according to the duty ratio of the double-path PWM signal;
the power supply module is connected with the safety module, the safety module is connected with the filtering module, the filtering module is connected with the IC main control module and the high-frequency switch oscillation module, the high-frequency switch oscillation module is connected with the IC main control module and the output filtering module, the output filtering module is connected with the IC main control module and the LED double-circuit working module, the LED double-circuit working module is connected with the IC main control module, the output current adjusting module is connected with the IC main control module, and the PWM dimming module is connected with the IC main control module.
As a still further scheme of the utility model: the IC main control module comprises an integrated circuit U1, the model of the integrated circuit U1 is LQ1618, a No. 4 pin of the integrated circuit U1 is connected with a filtering module, a No. 3 pin of the integrated circuit U1 is connected with a high-frequency switch oscillation module, a No. 14 pin of the integrated circuit U1 is grounded, a No. 5 pin and a No. 6 pin of the integrated circuit U1 are connected with a PWM dimming module, a No. 8 pin and a No. 9 pin of the integrated circuit U1 are connected with an output current regulating module, a No. 12 pin of the integrated circuit U1 is connected with an output filtering module, and a No. 11 pin and a No. 10 pin of the integrated circuit U1 are connected with an LED double-way working module.
As a still further scheme of the utility model: the high-frequency switch oscillation module comprises an inductor L1 and a diode D1, one end of the inductor L1 is connected with the filtering module, the other end of the inductor L1 is connected with the anode of a diode D1 and the IC main control module, and the cathode of a diode D1 is connected with the output filtering module.
As a still further scheme of the utility model: the output filtering module comprises a capacitor C2, one end of a capacitor C2 is connected with the high-frequency switch oscillation module, the LED double-circuit working module and the IC main control module, and the other end of the capacitor C2 is grounded.
As a still further scheme of the utility model: the LED double-circuit working module comprises a light-emitting diode string W and a light-emitting diode string Y, one end of the light-emitting diode string W is connected with the light-emitting diode string Y and the output filtering module, the other end of the light-emitting diode string W is connected with the IC main control module, and the other end of the light-emitting diode string Y is connected with the IC main control module.
As a still further scheme of the utility model: the output current adjusting module comprises a resistor R1 and a resistor R2, one end of the resistor R1 is connected with a pin No. 9 of the integrated circuit U1, the other end of the resistor R1 is grounded, one end of the resistor R2 is connected with a pin No. 8 of the integrated circuit U1, and the other end of the resistor R2 is grounded.
Compared with the prior art, the utility model has the beneficial effects that: the input/output voltage range of the utility model can reach 3-37VDC, and the utility model has wide application places; the circuit supports lithium batteries and USB power supply; the light can be bright and dark, and can be adjusted at will through the PWN duty ratio, and the cold and warm colors and temperatures can be accurately adjusted; the whole-course dimming is free of stroboflash with the dimming depth as low as 1%, two ways of linear dimming of the IC main control module are simple, the IC peripheral circuit is simple, photoelectric integration is achieved, and an external power supply is not needed.
Drawings
Fig. 1 is a schematic diagram of a DC two-way PWM dimming LED driving circuit.
Fig. 2 is a circuit diagram of a DC two-way PWM dimming LED driving circuit.
Fig. 3 is a pin diagram of LQ 1618.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Referring to fig. 1, a DC dual-path PWM dimming LED driving circuit includes:
the power supply module is used for supplying direct current;
the safety module is used for protecting the circuit and is disconnected when the circuit current is overlarge;
the filtering module is used for filtering the direct current;
the IC master control module is used for comprehensively controlling the circuit;
the high-frequency switch module is used for outputting high-frequency direct current;
the output filtering module is used for filtering the high-frequency direct current and outputting the high-frequency direct current to the LED double-path working module;
the LED double-path working module is used for receiving the control of the IC main control module and controlling the LED to emit light;
the output current module is used for receiving the control of the IC main control module and controlling the working current of the LED double-path working module;
the PWM dimming module is used for outputting a double-path PWM signal to the IC main control module, and the IC main control module controls the LED light-emitting condition of the LED double-path working module according to the duty ratio of the double-path PWM signal;
the power supply module is connected with the safety module, the safety module is connected with the filtering module, the filtering module is connected with the IC main control module and the high-frequency switch oscillation module, the high-frequency switch oscillation module is connected with the IC main control module and the output filtering module, the output filtering module is connected with the IC main control module and the LED double-path working module, the LED double-path working module is connected with the IC main control module, the output current adjusting module is connected with the IC main control module, and the PWM dimming module is connected with the IC main control module.
In a specific embodiment: referring to fig. 2, the power supply module supplies voltage, the fuse module prevents excessive circuit current through the fuse F1, and the filter module filters current passing through the fuse F1.
In this embodiment: referring to fig. 2 and 3, the IC main control module includes an integrated circuit U1, the model of the integrated circuit U1 is LQ1618, the pin 4 of the integrated circuit U1 is connected to the filter module, the pin 3 of the integrated circuit U1 is connected to the high-frequency switching oscillation module, the pin 14 of the integrated circuit U1 is grounded, the pins 5 and 6 of the integrated circuit U1 are connected to the PWM dimming module, the pins 8 and 9 of the integrated circuit U1 are connected to the output current regulation module, the pin 12 of the integrated circuit U1 is connected to the output filter module, and the pins 11 and 10 of the integrated circuit U1 are connected to the LED dual-channel operation module.
The LQ1618 is a DC-DC LED driving chip with a wide input/output voltage range, and a 40V/130m omega power switch is integrated inside the LQ 1618. The LQ1618 operates in a boost mode with an input/output voltage range of up to 3-37 VDC.
The LQ1618 can adjust the output current through the external sampling resistor, and the precision of the output current can reach +/-3%. The LQ1618 can receive the PWM dimming signal and perform analog dimming through a PWM1/PWM2 pin, so that strobeless illumination is realized. The dimming depth is as low as 1%, and accurate color temperature control is convenient to realize.
In this embodiment: referring to fig. 2, the high-frequency switching oscillation module includes an inductor L1 and a diode D1, one end of the inductor L1 is connected to the filtering module, the other end of the inductor L1 is connected to the anode of the diode D1 and the IC main control module, and the cathode of the diode D1 is connected to the output filtering module.
The No. 7 pin RT pin of the integrated circuit U1 is connected with different resistors, the switching frequency of the Boost can be set, and the frequency of the current of the inductor L1 discharged from the No. 3 pin of the integrated circuit U1 is controlled. The internal pull-up current of the RT pin is 15 uA.
The inductance L1 has a value ranging from 10uH to 47 uH. In order to avoid saturation of the magnetic core, an inductor with the inductor saturation current exceeding 30-40% of the peak value of the inductor current in normal operation is selected.
In this embodiment: referring to fig. 2, the output filter module includes a capacitor C2, one end of the capacitor C2 is connected to the high-frequency switch oscillation module, the LED dual-channel operation module, and the IC main control module, and the other end of the capacitor C2 is grounded.
In this embodiment: referring to fig. 2, the LED dual-channel working module includes a light emitting diode string W and a light emitting diode string Y, one end of the light emitting diode string W is connected to the light emitting diode string Y and the output filter module, the other end of the light emitting diode string W is connected to the IC main control module, and the other end of the light emitting diode string Y is connected to the IC main control module.
PWM outputs two paths of PWM signals to an integrated circuit U1 through a module, and a pin No. 10 and a pin No. 11 of the integrated circuit U1 feed back the two paths of PWM signals, so that the current frequency of a working circuit of a light emitting diode string W and a light emitting diode string Y is influenced by the voltage on the pin No. 10 and the pin No. 11 of the integrated circuit U1, and further the current conduction time of the light emitting diode string W and the light emitting diode string Y in unit time is influenced, and further the brightness of the light emitting diode string W and the light emitting diode string Y is influenced. For example, 0-0.5S is high level and 0.5S-1S is low level in time 1S of pin 10 of the integrated circuit U1, no current flows through the led string Y in 0-0.5S, and current flows through the led string Y in 0.5S-1S, so that the led string Y emits light for 50% in time 1S, and the duty ratio of the PWM signal is controlled, so that 0.7S in pin 1S of pin 10 of the integrated circuit U1 is in low level, so that the led string Y emits light for 70%, which is 1S as an example, and may be milliseconds and microseconds in real life, and no light is emitted from the led string Y within a very short time by human eyes, so that the longer the light emitting time per unit time is, the brighter the led string Y is. The brightness of the light emitting diode string is adjusted by controlling the PWM duty cycle of the PWM pass module.
Integrated circuit U1 supports PWM dimming. When the PWM port voltage continues to be less than 0.2V, the integrated circuit U1 is in the off state. In the dimming mode, the high level of the PWM dimming signal must be greater than 2V. Applying a PWM signal of 500 Hz-1 OkHz at the PWM end, the average current of the LED will vary from 0-100% according to the PWM duty cycle.
In this embodiment: referring to fig. 2, the output current adjusting module includes a resistor R1 and a resistor R2, one end of the resistor R1 is connected to the pin 9 of the integrated circuit U1, the other end of the resistor R1 is grounded, one end of the resistor R2 is connected to the pin 8 of the integrated circuit U1, and the other end of the resistor R2 is grounded.
The two LED string currents can be set through a resistor R1 and a resistor R2 external sampling resistor which are connected to a pin 8 and a pin 9 (CS1/CS2 ends) of an integrated circuit U1.
The working principle of the utility model is as follows: the power supply module supplies direct current, the safety module protection circuit, circuit current breaks off when too big, the filtering module carries out filtering processing to direct current, IC main control module integrated control circuit, high frequency switch module outputs high frequency direct current, output filtering module filters the high frequency direct current, output gives LED double-circuit work module, LED double-circuit work module accepts IC main control module's control, control LED is luminous, output current module accepts IC main control module's control, control LED double-circuit work module's operating current, PWM module outputs double-circuit PWM signal for IC main control module, IC main control module controls the LED luminescence situation of LED double-circuit work module according to the duty ratio of double-circuit PWM signal.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (6)

1. The utility model provides a DC double-circuit PWM LED drive circuit that adjusts luminance which characterized in that:
this DC double-circuit PWM LED drive circuit that adjusts luminance includes:
the power supply module is used for supplying direct current;
the safety module is used for protecting the circuit and is disconnected when the circuit current is overlarge;
the filtering module is used for filtering the direct current;
the IC master control module is used for comprehensively controlling the circuit;
the high-frequency switch module is used for outputting high-frequency direct current;
the output filtering module is used for filtering the high-frequency direct current and outputting the high-frequency direct current to the LED double-path working module;
the LED double-path working module is used for receiving the control of the IC main control module and controlling the LED to emit light;
the output current module is used for receiving the control of the IC main control module and controlling the working current of the LED double-path working module;
the PWM dimming module is used for outputting a double-path PWM signal to the IC main control module, and the IC main control module controls the LED light-emitting condition of the LED double-path working module according to the duty ratio of the double-path PWM signal;
the power supply module is connected with the safety module, the safety module is connected with the filtering module, the filtering module is connected with the IC main control module and the high-frequency switch oscillation module, the high-frequency switch oscillation module is connected with the IC main control module and the output filtering module, the output filtering module is connected with the IC main control module and the LED double-circuit working module, the LED double-circuit working module is connected with the IC main control module, the output current adjusting module is connected with the IC main control module, and the PWM dimming module is connected with the IC main control module.
2. The DC dual-path PWM dimming LED driving circuit as claimed in claim 1, wherein the IC main control module comprises an integrated circuit U1, the model of the integrated circuit U1 is LQ1618, the No. 4 pin of the integrated circuit U1 is connected with the filtering module, the No. 3 pin of the integrated circuit U1 is connected with the high-frequency switching oscillation module, the No. 14 pin of the integrated circuit U1 is grounded, the No. 5 pin and the No. 6 pin of the integrated circuit U1 are connected with the PWM dimming module, the No. 8 pin and the No. 9 pin of the integrated circuit U1 are connected with the output current regulating module, the No. 12 pin of the integrated circuit U1 is connected with the output filtering module, and the No. 11 pin and the No. 10 pin of the integrated circuit U1 are connected with the LED dual-path working module.
3. The DC dual-path PWM dimming LED driving circuit according to claim 1, wherein the high frequency switching oscillation module comprises an inductor L1 and a diode D1, one end of the inductor L1 is connected with the filtering module, the other end of the inductor L1 is connected with the anode of a diode D1 and the IC main control module, and the cathode of a diode D1 is connected with the output filtering module.
4. The DC dual-path PWM dimming LED driving circuit according to claim 1, wherein the output filtering module comprises a capacitor C2, one end of the capacitor C2 is connected with the high-frequency switch oscillation module, the LED dual-path working module and the IC main control module, and the other end of the capacitor C2 is grounded.
5. The DC dual-path PWM dimming LED driving circuit according to claim 1, wherein the LED dual-path operation module comprises a light emitting diode string W and a light emitting diode string Y, one end of the light emitting diode string W is connected with the light emitting diode string Y and the output filter module, the other end of the light emitting diode string W is connected with the IC main control module, and the other end of the light emitting diode string Y is connected with the IC main control module.
6. The DC two-way PWM dimming LED driving circuit according to claim 2, wherein the output current adjusting module comprises a resistor R1 and a resistor R2, one end of the resistor R1 is connected with the pin No. 9 of the integrated circuit U1, the other end of the resistor R1 is grounded, one end of the resistor R2 is connected with the pin No. 8 of the integrated circuit U1, and the other end of the resistor R2 is grounded.
CN202220146926.1U 2022-01-20 2022-01-20 DC double-circuit PWM LED drive circuit that adjusts luminance Expired - Fee Related CN216905371U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202220146926.1U CN216905371U (en) 2022-01-20 2022-01-20 DC double-circuit PWM LED drive circuit that adjusts luminance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202220146926.1U CN216905371U (en) 2022-01-20 2022-01-20 DC double-circuit PWM LED drive circuit that adjusts luminance

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CN216905371U true CN216905371U (en) 2022-07-05

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Granted publication date: 20220705