CN112351548A - LED drive circuit driven by direct current constant voltage - Google Patents

LED drive circuit driven by direct current constant voltage Download PDF

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Publication number
CN112351548A
CN112351548A CN202010936977.XA CN202010936977A CN112351548A CN 112351548 A CN112351548 A CN 112351548A CN 202010936977 A CN202010936977 A CN 202010936977A CN 112351548 A CN112351548 A CN 112351548A
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China
Prior art keywords
voltage
current
circuit
constant
power supply
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CN202010936977.XA
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Inventor
俞贤晓
潘安宇
刘艳
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Xiamen Yankon Energetic Lighting Co Ltd
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Xiamen Sunshine Iot Technology Co ltd
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Priority to CN202010936977.XA priority Critical patent/CN112351548A/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/34—Voltage stabilisation; Maintaining constant voltage
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H05B45/24—Controlling the colour of the light using electrical feedback from LEDs or from LED modules
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • 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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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The invention provides an LED drive circuit adopting direct current constant voltage drive, which comprises: the intelligent constant-voltage power supply module and the numerical control linear LED module; the first input end and the second input end of the intelligent constant voltage power supply module are connected with external voltage, the positive output end of the intelligent constant voltage power supply module is connected with the positive pole of each numerical control linear LED module, and the negative output end of the intelligent constant voltage power supply module is connected with the negative pole of each numerical control linear LED module. When the intelligent constant voltage power supply module is connected with external voltage, the intelligent constant voltage power supply module adaptively sets normal output voltage to provide the lowest voltage required by normal work for the numerical control linear LED module. The LED lamp circuit driven by the direct current constant voltage has the same connecting structure as that of the prior art, and the LED light-emitting module has higher light-emitting conversion efficiency by adjusting the output voltage of the direct current stabilized voltage power supply.

Description

LED drive circuit driven by direct current constant voltage
Technical Field
The invention relates to an LED, in particular to an LED driving circuit.
Background
The volt-ampere characteristic of the LED light-emitting circuit formed by connecting the LED light-emitting devices in series and parallel determines that constant voltage cannot be directly added between the anode and the cathode of the LED light-emitting circuit to work, otherwise, the current flowing through the LED light-emitting circuit is easily larger to influence the service life of the LED light-emitting circuit, or the result that the normal use is influenced by insufficient luminance is generated due to a lower voltage. Therefore, a common LED lamp circuit includes a constant current driving circuit, which converts an input voltage into a constant current to drive an LED light emitting circuit to operate. The structure of the LED lamp circuit generally requires the constant current driving circuit and the LED light emitting circuit to be used in a one-to-one manner. However, in some applications, it is considered to be costly or the size of the LED lamp does not meet space requirements.
Therefore, the LED lamp using the dc constant voltage driving, which drives a plurality of LED lighting units with one dc regulated power supply, is widely used either because of the overall cost advantage or because the LED lighting units have the advantage of small size. In general, the dc regulated power supply and the LED light emitting units are installed independently of each other, and the dc regulated power supply and the LED light emitting units are connected to each other by a common wire.
The main circuit of the direct current constant voltage power supply is a constant voltage power supply module with constant voltage output, and the main circuit of the LED light-emitting unit is an LED light-emitting module.
The constant voltage power supply module in the prior art has a first input end and a second input end, a positive output end and a negative output end, the voltage accessed by the first input end and the second input end is converted to output proper direct current voltage to the positive output end and the negative output end, and the inside of the constant voltage power supply module is provided with a regulating device for regulating output voltage and can be preset with the output voltage. The LED light-emitting modules adopting the prior art are provided with a positive electrode and a negative electrode. The positive output end of the constant voltage power supply module is connected with the positive electrode of each LED light-emitting module, and the negative output end of the constant voltage power supply module is connected with the negative electrode of each LED light-emitting module, as shown in FIG. 1.
The LED light-emitting module adopting the prior art comprises an LED light-emitting circuit and a voltage-current conversion circuit. For convenience of production, the LED light-emitting circuits in the LED light-emitting modules are kept consistent, and the voltage-current conversion circuits of the LED light-emitting modules are also kept the same, so that the characteristics of the LED light-emitting modules are kept consistent.
The voltage circuit conversion circuit in the prior art usually adopts a resistance current limiting mode to connect the LED lighting circuit in one LED lighting module and a resistor in series. By using the characteristic of the resistor V ═ I × R, the voltage difference between the voltage applied to the LED lighting module and the voltage difference between the LED lighting circuits is converted into a current of an appropriate magnitude by setting the resistance value, and the LED lighting circuits are driven to emit light, as shown in fig. 2.
The structure of the LED light-emitting module in the prior art has the advantages of simple circuit, low cost, small size and the like, but in order to prevent the phenomenon that the luminous brightness is not uniform due to the current deviation caused by the voltage deviation between the LED light-emitting circuits, a larger voltage difference is kept between the access voltage of the LED light-emitting module and the working voltage of the LED light-emitting circuits. Therefore, the consumed power on the resistor is large, and the luminous conversion efficiency of the LED luminous module is low.
Meanwhile, the LED lamp driven by the direct current constant voltage in the prior art does not have the functions of independently adjusting the brightness and the color temperature of each LED light-emitting module, so that the LED lamp cannot adapt to the current trend of intelligent development of the LED lamp.
Disclosure of Invention
The invention aims to solve the technical problem of providing an LED lamp circuit driven by a direct current constant voltage, which has the same connecting structure as the prior art and enables an LED light-emitting module to have higher light-emitting conversion efficiency by adjusting the output voltage of a direct current stabilized power supply.
In order to solve the above technical problem, the present invention provides an LED driving circuit using dc constant voltage driving, including: the intelligent constant-voltage power supply module and the numerical control linear LED module;
the first input end and the second input end of the intelligent constant voltage power supply module are connected with external voltage, the positive output end of the intelligent constant voltage power supply module is connected with the positive pole of each numerical control linear LED module, and the negative output end of the intelligent constant voltage power supply module is connected with the negative pole of each numerical control linear LED module.
When the intelligent constant voltage power supply module is connected with external voltage, the intelligent constant voltage power supply module adaptively sets normal output voltage to provide the lowest voltage required by normal work for the numerical control linear LED module.
In a preferred embodiment: the intelligent constant voltage power supply module comprises a constant voltage power supply module, a current detection circuit, a voltage control circuit, a control interface circuit and a direct current voltage circuit;
when the constant voltage power supply module is connected with external voltage, a preset voltage is output, and the direct current voltage circuit converts the voltage output by the constant voltage power supply module and outputs direct current voltage to drive the current detection circuit, the voltage control circuit and the control interface circuit to start working;
the current detection circuit monitors the current flowing into the current input end of the current detection circuit in real time and outputs an electric signal,
the voltage control circuit receives the signal set and output by the electric signal and sets the normal output voltage when the constant voltage power supply module works normally.
The control interface circuit converts the external control signal and outputs a digital signal; the voltage control circuit receives the digital signal and outputs a first control signal at an output end according to a preset rule; and the constant voltage power supply module receives the first control signal and outputs corresponding direct current voltage.
In a preferred embodiment: the voltage control circuit outputs a control signal to regulate the output voltage of the constant voltage power supply module to start rising from the lowest output voltage;
when the voltage control circuit controls the output voltage of the constant voltage power supply module to rise, and the electric signal output by the current detection circuit is detected to be the electric signal of which the current is not increased any more, the current of the constant current output end inside the numerical control linear LED module connected at the moment is judged to reach the set value, and the voltage output by the intelligent constant voltage power supply module is equal to or slightly greater than the minimum voltage required by the numerical control linear LED module during normal operation, namely the normal output voltage.
In a preferred embodiment: the voltage control circuit outputs a control signal to adjust the output voltage of the constant voltage power supply module to reduce from the highest output voltage;
when the voltage control circuit controls the output voltage of the voltage power supply module to be reduced and detects that the electric signal output by the current detection circuit is the electric signal of which the current starts to be reduced, the current of the constant current output end inside the numerical control linear LED module connected at the moment is judged to reach a set value, and the voltage output by the intelligent constant voltage power supply module is equal to or slightly greater than the minimum voltage required by the numerical control linear LED module during normal operation, namely the normal output voltage.
In a preferred embodiment: the first input end and the second input end of the constant voltage power supply module are respectively the first input end and the second input end of the intelligent constant voltage power supply module, and the positive output end of the constant voltage power supply module is the positive output end of the intelligent voltage power supply module;
the negative electrode of the current detection circuit is connected with the negative output end of the constant voltage power supply module, and the current input end of the current detection circuit is the negative output end of the intelligent constant voltage power supply module;
the signal output end of the current detection circuit is connected with the current signal input end of the voltage control circuit, and the output end of the voltage control circuit is connected with the voltage regulation end of the constant voltage power supply module; the interface signal input end of the voltage control circuit is connected with the output end of the control interface circuit;
the input end of the direct-current voltage circuit is connected with the positive output end of the constant-voltage power supply module, and the negative electrode of the direct-current voltage circuit is connected with the negative output end of the constant-voltage power supply module;
the positive electrode of the current detection circuit, the positive electrode of the voltage control circuit and the positive electrode of the control interface circuit are respectively connected with the output end of the direct-current voltage circuit; and the cathode of the current detection circuit, the cathode of the voltage control circuit and the cathode of the control interface circuit are respectively connected with the cathode of the direct-current voltage circuit.
In a preferred embodiment: the control interface circuit is also used for receiving an external control signal, converting the external control signal into a digital signal and outputting the digital signal to the voltage control circuit, and the voltage control circuit outputs a first control signal at an output end according to a preset rule; the constant voltage power supply module receives the first control signal, outputs corresponding direct current voltage and outputs the direct current voltage to each numerical control linear LED module in a form of outputting pulsating direct current voltage;
and the brightness and the color temperature of the digital linear LED modules are correspondingly set after decoding by extracting the digital communication signals in the pulsating direct current voltage by each numerical control linear LED module.
In a preferred embodiment: the digital communication signals in the pulsating direct current voltage are divided into normal state control signals corresponding to normal state output voltage and abnormal state control signals corresponding to abnormal state output voltage.
In a preferred embodiment: the abnormal output voltage is higher than the normal output voltage, and the voltage difference between the abnormal output voltage and the normal output voltage is greater than or equal to the voltage value required by the high level of the digital control circuit in the digital linear LED module.
In a preferred embodiment: the numerical control linear LED module comprises a digital control circuit and a linear constant current LED unit;
the digital control circuit obtains a digital communication signal from the pulsating direct current voltage, converts the digital communication signal into a second control signal according to a preset rule and outputs the second control signal from the control end; and the linear constant-current LED unit sets the luminous brightness and the color temperature of the linear constant-current LED unit according to the second control signal.
In a preferred embodiment: the linear constant current LED unit comprises at least one LED light-emitting circuit and a linear constant current circuit, and the linear constant current circuit at least comprises a constant current output end, a control end and a negative electrode;
the positive electrode of the LED light-emitting circuit is connected with the positive electrode of the linear constant-current LED unit, and the negative electrode of the LED light-emitting circuit is connected with the constant-current output end of the linear constant-current circuit in a one-to-one manner; the control end of the linear constant current circuit is connected with the control end of the linear constant current LED unit, and the negative electrode of the linear constant current circuit is connected with the negative electrode of the linear constant current LED unit; the constant current output end of the linear constant circuit is provided with a voltage threshold, and the maximum current value flowing through the constant current output end is set by a signal of the control end;
when the voltage of the constant current output end is the voltage threshold value or is slightly larger than the voltage threshold value, the current flowing into the constant current output end is kept to be a set current value; when the voltage of the constant current output port is reduced from being equal to the threshold voltage of the constant current output port, the current flowing into the constant current output port is reduced from a set current value; when the voltage of the constant current output end is increased from being less than the threshold voltage to being equal to the threshold voltage, the current flowing into the constant current output end is increased or decreased to a set current value;
the linear constant current circuit obtains a control signal from the control end to set the set value of the current of each constant current output end, when the voltage of the constant current output end is greater than or equal to the voltage threshold value, the current flowing through the constant current output end is the set value, and the brightness of the LED light-emitting circuit connected to the port is in direct proportion to the current.
Drawings
FIG. 1 is a diagram of a circuit structure of an LED lamp driven by a DC constant voltage;
fig. 2 is a circuit structure diagram of a conventional LED light emitting module;
FIG. 3 is a circuit block diagram of a digitally controlled linear LED module in a preferred embodiment of the present invention;
FIG. 4 is a circuit block diagram of an intelligent voltage power supply module in accordance with a preferred embodiment of the present invention;
FIG. 5 is a circuit schematic of the detection control circuit in a preferred embodiment of the present invention;
FIG. 6 is a circuit schematic of a voltage control circuit in a preferred embodiment of the present invention;
fig. 7 is a circuit schematic of a current sensing circuit in a preferred embodiment of the invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; 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 those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise specifically stated or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements.
Referring to fig. 1 to 7, the present invention provides an LED driving circuit using dc constant voltage driving, including: the intelligent constant-voltage power supply module and the numerical control linear LED module;
the first input end and the second input end of the intelligent constant voltage power supply module are connected with external voltage, the positive output end of the intelligent constant voltage power supply module is connected with the positive pole of each numerical control linear LED module, and the negative output end of the intelligent constant voltage power supply module is connected with the negative pole of each numerical control linear LED module.
When the intelligent constant voltage power supply module is connected with external voltage, the intelligent constant voltage power supply module adaptively sets normal output voltage to provide the lowest voltage required by normal work for the numerical control linear LED module. When the setting of the normal output voltage is completed, the voltage control circuit stores the normal control signal. The normal control signal of the voltage control circuit remains unchanged until the normal output voltage is not set again.
Specifically, the intelligent constant voltage power supply module comprises a constant voltage power supply module, a current detection circuit, a voltage control circuit, a control interface circuit and a direct current voltage circuit;
when the constant voltage power supply module is connected with external voltage, a preset voltage is output, and the direct current voltage circuit converts the voltage output by the constant voltage power supply module and outputs direct current voltage to drive the current detection circuit, the voltage control circuit and the control interface circuit to start working;
the current detection circuit monitors the current flowing into the current input end of the current detection circuit in real time and outputs an electric signal,
the voltage control circuit receives the signal set and output by the electric signal and sets the normal output voltage when the constant voltage power supply module works normally.
The control interface circuit converts the external control signal and outputs a digital signal; the voltage control circuit receives the digital signal and outputs a first control signal at an output end according to a preset rule; and the constant voltage power supply module receives the first control signal and outputs corresponding direct current voltage.
The constant voltage power supply module is a universal voltage conversion circuit adopted by the existing constant voltage power supply and is internally provided with a reference voltage port. The reference voltage port is connected with the positive output end through an upper arm resistor, the reference voltage port is connected with the negative output end through a lower arm resistor, and the output voltage of the constant voltage power supply module can be adjusted by adjusting the proportion of the resistance value of the upper arm to the resistance value of the lower arm. In the circuit of this embodiment, the reference voltage port of the constant voltage power supply module is a voltage regulation terminal.
When the LED driving circuit adopting direct-current constant-voltage driving starts to be connected with input voltage, the voltage control circuit enables the constant-voltage power supply module to output corresponding different voltages by outputting different control signals, and meanwhile, the voltage control circuit judges the output signal of the current detection circuit, and finally the voltage output by the intelligent constant-voltage power supply module is the maximum value of the working voltage threshold values of the numerical control linear LED modules.
The specific adjusting method comprises two methods:
the voltage control circuit outputs a control signal to regulate the output voltage of the constant voltage power supply module to rise from the lowest output voltage; when the voltage control circuit controls the output voltage of the constant voltage power supply module to rise, and the electric signal output by the current detection circuit is detected to be the electric signal of which the current is not increased any more, the current of the constant current output end inside the numerical control linear LED module connected at the moment is judged to reach the set value, and the voltage output by the intelligent constant voltage power supply module is equal to or slightly greater than the minimum voltage required by the numerical control linear LED module during normal operation, namely the normal output voltage.
The voltage control circuit outputs a control signal to adjust the output voltage of the constant voltage power supply module to reduce from the highest output voltage; when the voltage control circuit controls the output voltage of the voltage power supply module to be reduced and detects that the electric signal output by the current detection circuit is the electric signal of which the current starts to be reduced, the current of the constant current output end inside the numerical control linear LED module connected at the moment is judged to reach a set value, and the voltage output by the intelligent constant voltage power supply module is equal to or slightly greater than the minimum voltage required by the numerical control linear LED module during normal operation, namely the normal output voltage.
In this embodiment, the specific connection relationship of each module inside the intelligent constant voltage power supply module is as follows: the first input end and the second input end of the constant voltage power supply module are respectively the first input end and the second input end of the intelligent constant voltage power supply module, and the positive output end of the constant voltage power supply module is the positive output end of the intelligent voltage power supply module;
the negative electrode of the current detection circuit is connected with the negative output end of the constant voltage power supply module, and the current input end of the current detection circuit is the negative output end of the intelligent constant voltage power supply module;
the signal output end of the current detection circuit is connected with the current signal input end of the voltage control circuit, and the output end of the voltage control circuit is connected with the voltage regulation end of the constant voltage power supply module; the interface signal input end of the voltage control circuit is connected with the output end of the control interface circuit;
the input end of the direct-current voltage circuit is connected with the positive output end of the constant-voltage power supply module, and the negative electrode of the direct-current voltage circuit is connected with the negative output end of the constant-voltage power supply module;
the positive electrode of the current detection circuit, the positive electrode of the voltage control circuit and the positive electrode of the control interface circuit are respectively connected with the output end of the direct-current voltage circuit; and the cathode of the current detection circuit, the cathode of the voltage control circuit and the cathode of the control interface circuit are respectively connected with the cathode of the direct-current voltage circuit.
In this embodiment, the control interface circuit is configured to receive an external control signal, convert the external control signal into a digital signal, and output the digital signal to the voltage control circuit, where the voltage control circuit outputs a first control signal at an output end according to a preset rule; the constant voltage power supply module receives the first control signal and outputs corresponding direct current voltage,
and outputting the pulse direct current voltage to each numerical control linear LED module; and the brightness and the color temperature of the digital linear LED modules are correspondingly set after decoding by extracting the digital communication signals in the pulsating direct current voltage by each numerical control linear LED module. Therefore, the brightness and the color temperature of the LED module can be actively changed by the driving circuit according to the requirements of users.
The digital communication signals in the pulsating direct current voltage are divided into normal state control signals corresponding to normal state output voltage and abnormal state control signals corresponding to abnormal state output voltage.
The voltage control circuit in the intelligent constant voltage power supply module and the digital control circuit in the numerical control linear LED module preset the coding and decoding rules of digital communication signals, and each numerical control linear LED module has a unique address code. After the constant voltage driving circuit finishes setting of normal output voltage, the intelligent constant voltage power supply module can receive external control signals and independently set and simultaneously set the connected numerical control linear LED modules.
When the control interface circuit is not connected with an external control signal, the control interface circuit does not output the control signal, and the output of the voltage control circuit is a normal state control signal.
If the control interface circuit receives an external control signal and outputs a digital signal at the output end of the control interface circuit, the voltage control circuit converts the received digital signal into a digital communication signal combined by a 0 level and a 1 level according to the rule requirement of the transmitted digital communication signal, namely the first control signal.
If the signal of the output end of the voltage control circuit corresponding to the voltage of 0 level of the voltage control circuit is the normal state control signal, the signal of the output end corresponding to the 1 level of the voltage control circuit is the abnormal state control signal. When the signal at the output end of the voltage controller is an abnormal state control signal, the output voltage of the constant voltage power supply module or the intelligent voltage power supply module deviates from the normal state output voltage, and the output voltage is called as abnormal state output voltage. When the voltage control circuit sends a digital communication signal, the voltage output by the intelligent voltage power supply module is a pulsating direct current voltage consisting of a normal output voltage corresponding to a 0 level and an abnormal output voltage corresponding to a 1 level.
In this embodiment, the abnormal output voltage is higher than the normal output voltage, so that the digital communication signal transmission has the advantages that the brightness of the digital linear LED module is not affected, the total current output by the intelligent voltage power supply module is kept unchanged, and electromagnetic interference is not generated when the digital communication signal is transmitted.
Furthermore, the voltage difference between the abnormal output voltage and the normal output voltage is greater than or equal to the voltage value required by the high level of the digital control circuit in the digital linear LED module, so that the signal receiving circuit of the digital control circuit can be simplified.
The control characteristic of this circuit is after the control interface circuit receives the external control signal, output control digital signal, the voltage control circuit changes the control digital signal received into the digital communication signal according to the agreement, correspond to the normal state control signal according to the 0 level, the 1 level corresponds to the abnormal state control signal and exports at the control end in proper order, control constant voltage power module output corresponding normal state output voltage and unusual state output voltage, the digital communication signal is in the mode of pulsating direct current voltage, through the positive output terminal and the negative output terminal of intelligence constant voltage power module, and do not need to increase the communication line in addition.
The digital control linear LED module connected with the positive and negative output ends converts the received normal output voltage and abnormal output voltage into corresponding digital communication signals consisting of 0 level and 1 level in sequence, and sets the brightness, color temperature or color corresponding to the digital control linear LED module according to a specified protocol. This allows external control of some or all of the digitally controlled linear LED modules in the circuit. Therefore, the numerical control linear LED module only needs two connecting ends, and accords with the habit that the current LED lamp uses two-wire connection.
In this embodiment, the numerical control linear LED module includes a digital control circuit and a linear constant current LED unit; the digital control circuit obtains a digital communication signal from the pulsating direct current voltage, converts the digital communication signal into a second control signal according to a preset rule and outputs the second control signal from the control end; and the linear constant-current LED unit sets the luminous brightness and the color temperature of the linear constant-current LED unit according to the second control signal.
The digital control circuit is provided with an anode, a cathode and at least one control end, the linear constant current LED unit is provided with an anode, a cathode and at least one control end, and the number of the control ends of the digital control circuit corresponds to that of the control ends of the linear constant current LED unit.
The anode of the digital control circuit is connected with the anode of the linear constant-current LED unit, the connecting end of the digital control circuit is the anode of the digital control LED module, the cathode of the digital control circuit is connected with the cathode of the linear constant-current LED unit, and the connecting end of the digital control circuit is the cathode of the numerical control linear LED module. The control end of the digital control circuit is correspondingly connected with the control end of the linear constant-current LED unit, and the number or the signal characteristics of the control ends of the linear constant-current LED unit are determined by the control requirement of the linear constant-current LED unit. The digital control circuit obtains a digital communication signal from the positive pulsating direct current voltage, converts the digital communication signal into a control signal according to a preset rule and outputs the control signal from the control end. And after receiving the control signal from the control end, the linear constant-current LED unit sets the brightness, color temperature or color of the linear constant-current LED unit.
The linear constant current LED unit comprises at least one LED light-emitting circuit and a linear constant current circuit, wherein the linear constant current circuit at least comprises a constant current output end, a control end and a negative electrode. The positive pole of the LED light-emitting circuit is connected with the positive pole of the linear constant-current LED unit, and the negative pole of the LED light-emitting circuit is connected with the constant-current output end of the linear constant-current circuit in a one-to-one mode. The control end of the linear constant current circuit is connected with the control end of the linear constant current LED unit, and the negative electrode of the linear constant current circuit is connected with the negative electrode of the linear constant current LED unit.
The constant current output end of the linear constant circuit has a voltage threshold value, and the maximum current value flowing through the constant current output end can be set through a signal of the control end.
When the voltage of the constant current output end is the voltage threshold value or is slightly larger than the voltage threshold value, the current flowing into the constant current output end is kept to be a set current value; when the voltage of the constant current output port is reduced from being equal to the threshold voltage of the constant current output port, the current flowing into the constant current output port is reduced from a set current value; when the voltage of the constant current output end is increased from being less than the threshold voltage to being equal to the threshold voltage, the current flowing into the constant current output end is increased or decreased to a set current value;
when the voltage of the constant current output end is the voltage threshold or is slightly larger than the voltage threshold, the current of the constant current output end is a set value, and the power consumption of the linear constant circuit is the lowest, so that the linear constant current LED unit has higher luminous conversion efficiency at the moment. If the voltage connected between the anode and the cathode of the linear constant-current LED unit at the moment, namely the voltage between the anode and the cathode of the numerical control linear LED module, is called as the working voltage threshold of the numerical control linear LED module, when the working voltage connected to the numerical control linear LED module is equal to the working voltage threshold, the numerical control linear LED module can be kept to normally work, and the luminous conversion efficiency is high.
The linear constant current circuit obtains a control signal from the control end to set the set value of the current of each constant current output end, when the voltage of the constant current output end is greater than or equal to the voltage threshold value, the current flowing through the constant current output end is the set value, and the brightness of the LED light-emitting circuit connected to the port is in direct proportion to the current.
Therefore, the digital control circuit controls the brightness of each LED light-emitting unit by outputting a control signal. If a plurality of LED light-emitting circuits with different color temperatures or colors in the linear constant-current LED unit emit different brightness when the LED light-emitting circuits are driven by currents with different magnitudes, the linear constant-current LED unit generates different mixed colors.
The working current of the digital control circuit is small and far smaller than the maximum working current of the LED light-emitting circuit. Therefore, the numerical control linear LED module has the characteristic that when the voltage at the two ends is smaller than the working voltage threshold value, the current flowing through the numerical control linear LED module is rapidly increased due to the increase of the voltage at the two ends, and the current flowing through the numerical control linear LED module is rapidly reduced due to the decrease of the voltage at the two ends; when the voltage at the two ends is larger than or equal to the working voltage threshold value and changes, the current flowing through the numerical control linear LED module is kept unchanged and is a circuit set value.
In this embodiment, a specific circuit structure is further provided, as shown in fig. 5 to 7: the digital control circuit of the numerical control linear LED module comprises a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first diode D1, a second diode D2, a first triode Q1 and a first integrated circuit U1. The first diode D1 is a zener diode, the second diode D2 is a ballast diode, and the first integrated circuit U1 is a general-purpose one-chip. The single chip is provided with a positive electrode, a negative electrode, an input pin and a plurality of output pins, and the output pins of the single chip are the control ends of the digital control circuit. The input pin of the single chip is used for accessing information of positive and negative pulsating voltages of the slave digital control circuit. The first resistor R1, the first diode D1, the first triode Q1, the first capacitor C1 and the second capacitor C2 form a voltage conversion circuit to provide working voltage for the single chip circuit. And the circuit consists of a second resistor R2, a third resistor R3, a second diode D2 and a third capacitor C3 and is used for extracting digital communication signals in the pulsating direct current voltage to the single chip.
One end of a first resistor R1, a collector of a first triode Q1 and one end of a third capacitor C3 are connected, the connection end of the first resistor R1 is the anode of the digital control circuit, the other end of the first resistor R1 and the cathode of a first diode D1, one end of a first capacitor C1 is connected with the base of a first triode Q1, the emitter of the first triode Q1 and one end of a second capacitor C2 are connected with the anode of the single chip. The other end of the third capacitor C3, one end of the second resistor R2 and one end of the third resistor R3 are connected with the negative electrode of the second diode D2, and the other end of the second resistor R2 is connected with the input pin of the singlechip chip. The anode of the first diode D1, the other end of the first capacitor C1, the other end of the second capacitor C2, the other end of the third resistor R3, and the anode of the second diode D2 are connected with the cathode of the single chip microcomputer chip, and the connection end of the second diode D2 is the cathode of the digital control circuit.
The voltage control circuit of the intelligent constant voltage power supply module comprises a second integrated circuit U2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9. The second integrated circuit U2 adopts a single chip microcomputer chip, the single chip microcomputer chip is provided with a positive electrode, a negative electrode, two input pins and four output pins, one of the input pins is a current signal input end and is connected with the current detection circuit, and the other input end is an interface signal input end and is connected with the control interface circuit.
Four output pins of the singlechip chip are respectively connected with one end of a sixth resistor R6, one end of a seventh resistor R7, one end of an eighth resistor R8 and one end of a ninth resistor R9. The other end of the sixth resistor R6, the other end of the seventh resistor R7, the other end of the eighth resistor R8 and the other end of the ninth resistor R9 are connected. The connecting end of the voltage control circuit is the output end of the voltage control circuit. The positive pole and the negative pole of the single chip microcomputer chip are respectively the positive pole and the negative pole of the voltage control circuit.
The 4 output pins of the single chip meet the requirements of setting normal output voltage and abnormal voltage by converting different data signals.
In practical use, because the working voltage threshold of the numerical control linear LED module is known, the output voltage of the constant voltage power supply module is preset according to the working voltage threshold of each numerical control linear LED module, and the voltage control circuit is used for setting the normal output voltage of the intelligent constant voltage power supply module to better adapt to the normal deviation among the digital linear LED modules. As shown in fig. 5, R5 is an internal voltage regulator of the constant voltage power module, and the output voltage of the constant voltage power module M1 can be regulated by regulating the value of R5.
In the circuit, the single chip microcomputer chip only needs to adopt SOP8 to package a universal single chip microcomputer chip, and the cost performance is high.
The current detection circuit comprises a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourth capacitor C4, a fifth capacitor C5, a third integrated circuit U3 and a second triode Q2.
The third integrated circuit U3 is a general linear amplifier circuit having an anode, a cathode, a non-inverting input, an inverting input, and an output. One end of a tenth resistor is connected with the non-inverting input end of the linear amplifying circuit, and is used as the current input end of the current detecting circuit, the positive electrode of the linear amplifying circuit is the positive electrode of the current detecting circuit, the inverting input end of the linear amplifying circuit is connected with one end of an eleventh resistor R11, one end of a twelfth resistor R12, one end of a fifth capacitor C5, the other end of the eleventh resistor R11 is connected with one end of a fourth capacitor C4, the output end of the linear amplifying circuit is connected with the other end of a twelfth resistor R12, the other end of a fifth capacitor C5, one end of a thirteenth resistor R13, the other end of the thirteenth resistor R13 is connected with the base of a second triode Q2, the collector of the second triode Q2 is the signal output end of the current detecting circuit, the emitter of the second triode Q2, the other end of the tenth resistor, and the other end of the fourth capacitor C4 are connected with the negative electrode of the linear amplifying circuit, the connecting end of the current detection circuit is the cathode of the current detection circuit.
In the circuit, a tenth resistor R10 is used for the current sampling element, when the current flowing through the tenth resistor R10 keeps unchanged, the voltage output by the linear amplifying circuit is smaller than the conducting voltage of the base electrode of the second triode Q2, the collector electrode and the emitter electrode of the second triode Q2 are cut off, and high level is output; when the current flowing through the tenth resistor R10 increases, the voltage output by the linear amplification circuit is equal to or higher than the turn-on voltage of the base of the second triode Q2, and the collector and the emitter of the second triode Q2 are turned on to output a low level. When the normal output voltage is set adaptively, a first setting method, i.e., a method of adjusting the output voltage of the intelligent constant voltage power supply module to be increased from the lowest voltage thereof, is preferably required. The circuit has the advantages of simple circuit, low cost and high cost performance.
The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.

Claims (10)

1. An LED drive circuit driven by a direct current constant voltage, comprising: the intelligent constant-voltage power supply module and the numerical control linear LED module;
the first input end and the second input end of the intelligent constant voltage power supply module are connected with external voltage, the positive output end of the intelligent constant voltage power supply module is connected with the positive pole of each numerical control linear LED module, and the negative output end of the intelligent constant voltage power supply module is connected with the negative pole of each numerical control linear LED module.
When the intelligent constant voltage power supply module is connected with external voltage, the intelligent constant voltage power supply module adaptively sets normal output voltage to provide the lowest voltage required by normal work for the numerical control linear LED module.
2. The LED driving circuit according to claim 1, wherein: the intelligent constant voltage power supply module comprises a constant voltage power supply module, a current detection circuit, a voltage control circuit, a control interface circuit and a direct current voltage circuit;
when the constant voltage power supply module is connected with external voltage, a preset voltage is output, and the direct current voltage circuit converts the voltage output by the constant voltage power supply module and outputs direct current voltage to drive the current detection circuit, the voltage control circuit and the control interface circuit to start working;
the current detection circuit monitors the current flowing into the current input end of the constant voltage power supply module in real time and outputs an electric signal, and the voltage control circuit receives the electric signal to set the output signal and set the normal output voltage of the constant voltage power supply module during normal work.
The control interface circuit converts the external control signal and outputs a digital signal; the voltage control circuit receives the digital signal and outputs a first control signal at an output end according to a preset rule; and the constant voltage power supply module receives the first control signal and outputs corresponding direct current voltage.
3. The LED driving circuit driven by DC constant voltage as claimed in claim 2, wherein: the voltage control circuit outputs a control signal to regulate the output voltage of the constant voltage power supply module to start rising from the lowest output voltage;
when the voltage control circuit controls the output voltage of the constant voltage power supply module to rise, and the electric signal output by the current detection circuit is detected to be the electric signal of which the current is not increased any more, the current of the constant current output end inside the numerical control linear LED module connected at the moment is judged to reach the set value, and the voltage output by the intelligent constant voltage power supply module is equal to or slightly greater than the minimum voltage required by the numerical control linear LED module during normal operation, namely the normal output voltage.
4. The LED driving circuit driven by DC constant voltage as claimed in claim 2, wherein: the voltage control circuit outputs a control signal to adjust the output voltage of the constant voltage power supply module to reduce from the highest output voltage;
when the voltage control circuit controls the output voltage of the voltage power supply module to be reduced and detects that the electric signal output by the current detection circuit is the electric signal of which the current starts to be reduced, the current of the constant current output end inside the numerical control linear LED module connected at the moment is judged to reach a set value, and the voltage output by the intelligent constant voltage power supply module is equal to or slightly greater than the minimum voltage required by the numerical control linear LED module during normal operation, namely the normal output voltage.
5. The LED driving circuit driven by DC constant voltage as claimed in claim 2, wherein: the first input end and the second input end of the constant voltage power supply module are respectively the first input end and the second input end of the intelligent constant voltage power supply module, and the positive output end of the constant voltage power supply module is the positive output end of the intelligent voltage power supply module;
the negative electrode of the current detection circuit is connected with the negative output end of the constant voltage power supply module, and the current input end of the current detection circuit is the negative output end of the intelligent constant voltage power supply module;
the signal output end of the current detection circuit is connected with the current signal input end of the voltage control circuit, and the output end of the voltage control circuit is connected with the voltage regulation end of the constant voltage power supply module; the interface signal input end of the voltage control circuit is connected with the output end of the control interface circuit;
the input end of the direct-current voltage circuit is connected with the positive output end of the constant-voltage power supply module, and the negative electrode of the direct-current voltage circuit is connected with the negative output end of the constant-voltage power supply module;
the positive electrode of the current detection circuit, the positive electrode of the voltage control circuit and the positive electrode of the control interface circuit are respectively connected with the output end of the direct-current voltage circuit; and the cathode of the current detection circuit, the cathode of the voltage control circuit and the cathode of the control interface circuit are respectively connected with the cathode of the direct-current voltage circuit.
6. The LED driving circuit driven by a direct current constant voltage according to any one of claims 1 to 5, wherein: the control interface circuit is used for receiving an external control signal and converting the external control signal into a digital signal to the voltage control circuit, and the voltage control circuit outputs a first control signal at an output end according to a preset rule; the constant voltage power supply module receives the first control signal, outputs corresponding direct current voltage and outputs the direct current voltage to each numerical control linear LED module in a form of outputting pulsating direct current voltage;
and the brightness and the color temperature of the digital linear LED modules are correspondingly set after decoding by extracting the digital communication signals in the pulsating direct current voltage by each numerical control linear LED module.
7. The LED driving circuit according to claim 6, wherein: the digital communication signals in the pulsating direct current voltage are divided into normal state control signals corresponding to normal state output voltage and abnormal state control signals corresponding to abnormal state output voltage.
8. The LED driving circuit according to claim 7, wherein: the abnormal output voltage is higher than the normal output voltage, and the voltage difference between the abnormal output voltage and the normal output voltage is greater than or equal to the voltage value required by the high level of the digital control circuit in the digital linear LED module.
9. The LED driving circuit according to claim 7 or 8, wherein: the numerical control linear LED module comprises a digital control circuit and a linear constant current LED unit;
the digital control circuit obtains a digital communication signal from the pulsating direct current voltage, converts the digital communication signal into a second control signal according to a preset rule and outputs the second control signal from the control end; and the linear constant-current LED unit sets the luminous brightness and the color temperature of the linear constant-current LED unit according to the second control signal.
10. The LED driving circuit according to claim 9, wherein: the linear constant current LED unit comprises at least one LED light-emitting circuit and a linear constant current circuit, and the linear constant current circuit at least comprises a constant current output end, a control end and a negative electrode;
the positive electrode of the LED light-emitting circuit is connected with the positive electrode of the linear constant-current LED unit, and the negative electrode of the LED light-emitting circuit is connected with the constant-current output end of the linear constant-current circuit in a one-to-one manner; the control end of the linear constant current circuit is connected with the control end of the linear constant current LED unit, and the negative electrode of the linear constant current circuit is connected with the negative electrode of the linear constant current LED unit; the constant current output end of the linear constant circuit is provided with a voltage threshold, and the maximum current value flowing through the constant current output end is set by a signal of the control end;
when the voltage of the constant current output end is the voltage threshold value or is slightly larger than the voltage threshold value, the current flowing into the constant current output end is kept to be a set current value; when the voltage of the constant current output port is reduced from being equal to the threshold voltage of the constant current output port, the current flowing into the constant current output port is reduced from a set current value; when the voltage of the constant current output end is increased from being less than the threshold voltage to being equal to the threshold voltage, the current flowing into the constant current output end is increased or decreased to a set current value;
the linear constant current circuit obtains a control signal from the control end to set the set value of the current of each constant current output end, when the voltage of the constant current output end is greater than or equal to the voltage threshold value, the current flowing through the constant current output end is the set value, and the brightness of the LED light-emitting circuit connected to the port is in direct proportion to the current.
CN202010936977.XA 2020-09-08 2020-09-08 LED drive circuit driven by direct current constant voltage Withdrawn CN112351548A (en)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010936977.XA CN112351548A (en) 2020-09-08 2020-09-08 LED drive circuit driven by direct current constant voltage

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113099575A (en) * 2021-04-07 2021-07-09 深圳市优威电气技术有限公司 LED power supply control system and method based on multi-class power supply input

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113099575A (en) * 2021-04-07 2021-07-09 深圳市优威电气技术有限公司 LED power supply control system and method based on multi-class power supply input
CN113099575B (en) * 2021-04-07 2022-10-11 深圳市优威电气技术有限公司 LED power supply control method and system based on multi-class power supply input

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