CN220123105U - Constant current driving circuit and lamp - Google Patents
Constant current driving circuit and lamp Download PDFInfo
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- CN220123105U CN220123105U CN202321611356.XU CN202321611356U CN220123105U CN 220123105 U CN220123105 U CN 220123105U CN 202321611356 U CN202321611356 U CN 202321611356U CN 220123105 U CN220123105 U CN 220123105U
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Abstract
The utility model provides a constant current driving circuit and a lamp, wherein the constant current driving circuit comprises: the constant voltage module converts external alternating current into constant voltage direct current, and the output negative end of the constant voltage module is connected with a first resistor; the constant current module is connected with the constant voltage module and converts the direct current of constant voltage into the direct current of constant current; the operational amplifier detection module detects the voltage of the first resistor; the control module is connected with the output positive end of the constant voltage module, detects the output voltage of the constant voltage module, is also connected with the operational amplifier detection module, and the output end of the control module is connected with the constant current module and is configured to output signals to the constant current module; the voltage of the first resistor is amplified by the operational amplifier detection module and then output to the control module, the control module can calculate the input power of the constant current drive circuit according to the detected output voltage of the constant voltage module and the voltage of the first resistor, and the constant current drive circuit has simple circuit and high accuracy of detection results.
Description
Technical Field
The utility model relates to the field of illumination, in particular to a constant current driving circuit and a lamp.
Background
With the improvement of living standard, the LED illumination is increasingly applied to a plurality of scenes, wherein the intelligent illumination is also increasingly widely used in the actual life of people, and people meet more use demands by controlling the LED lamp.
The intelligent illumination can conveniently adjust the color temperature, the current and the like of the LED lamp through various control modes such as Bluetooth, WIFI, PLC, DALI,0-10V and the like, and the application scene and the requirement of people on diversity are met. In intelligent illumination, communication is generally performed with the outside in a mode of a communication module (Bluetooth, WIFI, PLC, DALI,0-10V and the like), external control information is transmitted to an MCU, and the MCU converts the transmitted control information into PWM signals to control the working state of the drive. Under different PWM signals, the output currents are different, and the LED voltages are also different, so that the detection of the input power will be complex, and more cost is often required to be increased.
In view of the foregoing, it is necessary to provide a constant current driving circuit, a circuit input power calculating method and a lamp for solving the above problems.
Disclosure of Invention
The utility model aims to provide a constant current driving circuit and a lamp.
In order to achieve the above object, the present utility model provides a constant current drive circuit comprising:
the constant voltage module is used for converting external alternating current into constant-voltage direct current, and the output negative end of the constant voltage module is connected with a first resistor;
the constant current module is connected with the constant voltage module and is configured to convert direct current of constant voltage into direct current of constant current;
the input end of the operational amplifier detection module is connected with two ends of the first resistor and is configured to detect the voltage of the first resistor;
the control module is connected with the output positive end of the constant voltage module, detects the output voltage of the constant voltage module, is also connected with the operational amplifier detection module, and the output end of the control module is connected with the constant current module and is configured to output signals to the constant current module;
the operational amplifier detection module amplifies the detected voltage of the first resistor and outputs the amplified voltage to the control module, and the control module calculates the input power of the constant current drive circuit according to the detected output voltage of the constant voltage module and the detected voltage of the first resistor.
As a further improvement of the utility model, the constant current module comprises two voltage dividing resistors, the two voltage dividing resistors are connected to the output end of the constant voltage module in series, the analog voltage is obtained after the voltage is divided by the two voltage dividing resistors and is transmitted to the control module, and the control module obtains the output voltage of the constant voltage module after conversion.
As a further improvement of the utility model, the constant current module comprises a warm light constant current module and a cold light constant current module which are mutually connected in parallel and are respectively used for supplying power to corresponding warm light LED loads and cold light LED loads.
As a further improvement of the utility model, the control module outputs two paths of PWM signals, the control module outputs a warm light PWM signal to the warm light constant current module, and the control module outputs a cold light PWM signal to the cold light constant current module.
As a further improvement of the utility model, the operational amplifier detection module comprises an operational amplifier chip, an eleventh resistor and an eighth resistor, wherein one end of the eleventh resistor is connected with the first resistor, the other end of the eleventh resistor is connected with the input end of the operational amplifier chip, and the output end of the operational amplifier chip outputs current to the control module through the eighth resistor.
As a further improvement of the present utility model, the control module is an MCU controller including an ADC configured to convert an analog signal into a digital signal for calculation.
As a further improvement of the utility model, a data table is stored in the MCU controller, and the MCU controller determines the efficiency value of the corresponding constant voltage module according to the actual duty ratio table.
As a further improvement of the utility model, the constant voltage module adopts a flyback isolation architecture, and the constant current module adopts a Buck constant current architecture.
Another object of the present utility model is to provide a lamp including the above constant current driving circuit.
In order to achieve the above purpose, the utility model provides a lamp, which comprises the constant current driving circuit.
As a further improvement of the utility model, the luminaire comprises two light source modules of different color temperatures, which are connected to the constant current drive circuit by means of a total of 4 wires of ledw+, LEDW-, ledc+, wherein ledw+, ledc+ are co-anodic on the constant current drive circuit and are directly connected to the output of the constant voltage module.
The beneficial effects of the utility model are as follows: compared with the prior art, the constant current driving circuit provided by the utility model has the advantages that the output current of the constant voltage module is detected by the operational amplifier detection module and is transmitted to the control module, meanwhile, the output current of the constant voltage module is detected by the control module, the input power of the constant current driving circuit can be obtained by calculating according to the efficiency value of the constant voltage module, the error of the calculated input power is smaller than that of the actual input power, the whole circuit is simpler, and the economical efficiency and the practicability are better.
Drawings
Fig. 1 is a schematic block diagram of a constant current drive circuit according to a preferred embodiment of the present utility model.
Fig. 2 is a circuit diagram of a constant current drive circuit of a preferred embodiment of the present utility model.
100-a constant current driving circuit;
10-constant voltage modules, 20-constant current modules, 30-control modules, 40-operational amplifier detection modules and 50-light source modules;
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in detail with reference to the accompanying drawings and specific embodiments.
In this case, in order to avoid obscuring the present utility model due to unnecessary details, only the structures and/or processing steps closely related to the aspects of the present utility model are shown in the drawings, and other details not greatly related to the present utility model are omitted.
In addition, it should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, 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, method, article, or apparatus.
Referring to fig. 1 to 2, a constant current driving circuit 100 of the present utility model includes:
the constant voltage module 10 is used for converting external alternating current into direct current with constant voltage, and a first resistor R1 is connected to the output negative end of the constant voltage module 10;
the constant current module 20 is connected with the constant voltage module 10, and the constant current module 20 is configured to convert direct current of constant voltage into direct current of constant current;
the input end of the operational amplifier detection module 40 is connected to two ends of the first resistor R1 and is configured to detect the voltage of the first resistor R1;
the control module 30 is connected with the output positive end of the constant voltage module 10, detects the output voltage of the constant voltage module 10, the control module 30 is also connected with the operational amplifier detection module 40, the output end of the control module 30 is connected with the constant current module 20, and is configured to output signals to the constant current module 20;
the op-amp detection module 40 amplifies the detected voltage of the first resistor R1 by a preset amplification factor and outputs the amplified voltage to the control module 30, and the control module 30 calculates the input power Pi of the constant current driving circuit 100 according to the detected output voltage Vo of the constant voltage module 10 and the voltage Vr of the first resistor R1.
The constant current driving circuit 100 of the present utility model can more accurately detect the voltage Vr on the first resistor R1 connected to the output end of the constant voltage module 10 through the operational amplifier detection module 40, and transmit the detected voltage Vr to the control module 30, and the control module 30 detects the output voltage Vo of the constant voltage module 10, and the control module 30 can calculate the input power Pi of the constant current driving circuit 100 according to the two values.
In some embodiments, the constant current module 20 includes two voltage dividing resistors, which are connected in series to the output end of the constant voltage module 10, and the analog voltage obtained by dividing the voltage by the two voltage dividing resistors is transmitted to the control module 30, and the control module 30 obtains the output voltage Vo of the constant voltage module 10 after conversion. The control module 30 includes an ADC therein for converting analog signals.
The constant current module 20 includes a warm light constant current module and a cold light constant current module connected in parallel, and is used for supplying power to the corresponding warm light LED load and cold light LED load respectively.
Preferably, the control module 30 outputs two paths of PWM signals, the control module 30 outputs a warm light PWM signal to the warm light constant current module, and the control module 30 outputs a cold light PWM signal to the cold light constant current module, in other embodiments, the control module outputs a single path or multiple paths of PWM signals corresponding to different color temperatures, which is not limited in the present utility model.
The operational amplifier detection module 40 includes an operational amplifier chip, an eleventh resistor R11, and an eighth resistor R8, where one end of the eleventh resistor R11 is connected to the first resistor R1, the other end is connected to the input end of the operational amplifier chip U1, and the output end of the operational amplifier chip U1 outputs a current to the control module 30 through the eighth resistor R8. The operational amplifier chip U1 and the resistors around the operational amplifier chip constitute a homodromous operational amplifier, the input signal can be amplified by 1+R8/R11 times in the same direction, the eleventh resistor R11 is connected with the first resistor R1, the first resistor R1 is connected with the GND end of the constant voltage module 10, current flows through the first resistor R1, so that a differential pressure is generated, the differential pressure is amplified by the homodromous operational amplifier and then provided for the control module 30, the voltage obtained by ADC sampling the analog signal is divided by the amplification factor of the homodromous operational amplifier and the resistance value of the first resistor R1 by the control module 30, and the output current Io of the constant voltage module 10 is obtained, so that the output power of the constant voltage module 10 is Po=Io.
The control module 30 is an MCU controller, the constant voltage module 10 adopts a flyback isolation architecture, and the constant current module 20 adopts a Buck constant current architecture. In other embodiments, the constant voltage module 10 may be other power supply structures, or may be non-isolated structures, so long as a fixed voltage can be generated; the constant current module 20 can also be any constant current architecture with PWM dimming function, such as Boost, buck-Boost, etc. of other power architectures; other types of controllers may be used for control module 30, as the utility model is not limited in this regard.
The input power of the constant current drive circuit 100 is calculated as follows:
step S1: the operational amplifier detection module 40 detects the voltage Vr of the first resistor R1, amplifies the voltage Vr by n times and outputs the amplified voltage Vr to the control module 30;
step S2: the control module 30 converts the received voltage of the first resistor R1 to obtain an output current Io of the constant-current driving circuit 100, the current received by the control module 30 can be obtained through a formula i=vr×n/R1, and the output current Io of the constant-current driving circuit 100 is obtained after dividing by the amplification factor n, and meanwhile, the control module 30 detects the output voltage Vo of the constant-voltage module 10;
step S3: the control module 30 calculates the output power Po of the constant voltage module 10 according to the output current Io of the constant current drive circuit 100 and the output voltage Vo of the constant voltage module 10, and a calculation formula is po=io×vo;
step S4: the control module 30 calculates the input power of the constant voltage module 10 according to the output power of the constant voltage module 10, where pi=po/η is a calculation formula indicating the efficiency of the constant voltage module 10.
The MCU controller is stored with a data table, and determines the efficiency value eta of the constant voltage module 10 corresponding to the actual duty ratio according to the actual duty ratio table.
Since the efficiency of the constant current driving circuit 100 is not too much after the device is selected, the efficiency of each constant current driving circuit 100 is not too different. The duty ratio D is from 1% to 100% by taking x test points (typically taking 10 points, i.e. one point for every 10% of the duty ratio), and each point takes the efficiency of the plurality of test constant current driving circuits 100 under the corresponding duty ratio, and then averages. Thus, the efficiency values eta of x duty cycle points are obtained, and the values are burnt into the MCU. The MCU divides the output power Po of the constant voltage module 10 after sampling calculation by the corresponding efficiency value eta according to the current PWM duty ratio D to obtain the current input power Pi.
The utility model also provides a lamp, which comprises the constant current driving circuit 100.
The lamp comprises two light source modules 50 with different color temperatures, wherein the light source modules 50 are connected with a constant current driving circuit 100 through 4 wires of LEDW+, LEDW-, LEDC+, LEDC-, wherein LEDW+, LEDC+ are co-anode on the constant current driving circuit 100 and are directly connected to the output end of a constant voltage module 10.
The following is an application of the constant current driving circuit 100 in intelligent constant current driving of constant current output 2-path PWM dimming, the constant current driving circuit 100 comprises a constant voltage module 10, an MCU and a constant current module 20, the constant current module 20 is an independent 2-path BUCK BUCK line, and the output current can be regulated by PWM signals of the MCU.
The MCU can output two paths of PWM signals, and the PWMW and the PWMC are respectively correspondingly connected to dimming PWM pins of the two paths of dimming BUCK. The MCU has other functions in this intelligent drive, which are not described in this embodiment.
The LED lamp light source is composed of two light source modules 50 with different color temperatures, and the two light source modules are respectively and correspondingly connected to two paths of driven outputs. One light source module 50 is an LED string with a color temperature of 2700K, and one light source module 50 is an LED string with a color temperature of 6500K. Different currents can be used to obtain different colors and brightness. The LED light source modules 50 are connected to the driver by 4 lines of ledw+, LEDW-, ledc+, LEDC-. Ledw+, ledc+ of the 4 wires are common anode on the constant current driving circuit 100, i.e. in a state of short circuit on the constant current driving circuit 100, and are directly connected to the output end of the constant voltage module 10.
The constant voltage module 10 is used for converting the power grid voltage to output a fixed voltage, and the module is not limited to a structure, in this example, a flyback isolation structure, other power supply structures, or a non-isolation structure, as long as a fixed voltage can be generated. The output is identified as 50V in this embodiment, and in other embodiments this voltage may be any suitable voltage, depending on the actual situation, as the utility model is not limited in this respect.
The constant current module 20 is a Buck constant current architecture in this example, and may be any other architecture power supply architecture Boost, buck-Boost, etc., as long as it is a constant current architecture with PWM dimming function. The example is two paths of constant currents, corresponding to different color temperatures, and can also be a single path or multiple paths.
The voltage dividing resistor comprises a second resistor R2 and a fourth resistor R4, and is connected to the output end 50V of the constant voltage module 10. The second resistor R2 and the fourth resistor R4 are divided to obtain an analog voltage, the analog voltage is transmitted to the PIN10 of the MCU, the MCU performs ADC sampling on the analog signal and then multiplies the analog signal by the second resistor R2, and the voltage division ratio of the fourth resistor R4 can obtain the output voltage Vo of the constant voltage module 10.
The operational amplifier chip U1 and the peripheral resistor form a homodromous operational amplifier, and can amplify the input signals by 1+R8/R11 times in the same direction. In this embodiment, the eighth resistor R8 is 220K, and the eleventh resistor R11 is 22K, so that the op-amp amplifies 11 times in the same direction. The input end of the homodromous amplifier is connected with a first resistor R1, the first resistor R1 is connected with the GND end of the constant voltage module 10, current flows through the first resistor R1, so that a differential pressure is generated, the homodromous operational amplifier amplifies the differential pressure by 11 times and provides the differential pressure for an MCU Pin9 Pin, the MCU converts voltage obtained by ADC sampling of the analog signal to obtain output current Io of the constant current drive circuit 100, and output power of the constant voltage module 10 is obtained to be Po=Io.
Generally, the elements of the constant current driving circuit 100 are manufactured in batches according to specifications, the overall error is not large, the overall efficiency is not large, the overall input power can be reversely calculated by testing the efficiency of other constant current driving circuits 100 in advance, the driving efficiency is different under different duty ratios, thus the efficiency under different duty ratios needs to be tested in advance and then data is stored in the MCU, and the MCU finds the corresponding efficiency value through the PWM duty ratio output by the MCU during actual calculation and then deduces the efficiency. The m constant current driving circuits 100 can be selected first, then the duty ratio is divided into x parts from 0-100%, the larger the number of x is, the more data to be tested are, and the more accurate the final result is. Under the PWM duty ratios of different x, the efficiency values of the constant current driving circuits 100 of the m stations are measured and averaged, and the duty ratios corresponding to the x average efficiency values are made into a data table and stored in the MCU. The MCU reads out the efficiency value eta according to the corresponding actual duty ratio table lookup, and the input power of the actual drive is Pi=Po/eta.
The circuit input power calculation method provided by the utility model is different from actual power detection, and the actual comparison finds that the error can be controlled within 5% with the difference between the actual power detection and the value detected by the power meter, but the circuit is simple in the application of the power detection with low requirements, and the circuit input power calculation method only needs to detect Vo of the constant voltage module 10, and the value of the efficiency is obtained through the MCU lookup table and then calculated, so that the peripheral circuit is simpler.
In summary, in the constant current driving circuit 100 of the present utility model, the output current of the constant voltage module 10 is detected by the operational amplifier detection module 40 and is transmitted to the control module 30, meanwhile, the control module 30 detects the output current of the constant voltage module 10, and then calculates according to the efficiency value of the constant voltage module 10 to obtain the input power of the constant current driving circuit 100, and the calculated input power has smaller error compared with the actual input power, simpler overall circuit and better economy and practicability.
The above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and it should be understood by those skilled in the art that the technical solution of the present utility model may be modified or substituted without departing from the spirit and scope of the technical solution of the present utility model.
Claims (10)
1. A constant current drive circuit, characterized by comprising:
the constant voltage module (10) is used for converting external alternating current into direct current with constant voltage, and a first resistor (R1) is connected to the output negative end of the constant voltage module (10);
a constant current module (20) connected to the constant voltage module (10), the constant current module (20) configured to convert a direct current of a constant voltage into a direct current of a constant current;
the input end of the operational amplifier detection module (40) is connected to two ends of the first resistor (R1) and is configured to detect the voltage of the first resistor (R1);
the control module (30), the said control module (30) is connected with output positive end of the said constant voltage module (10), detect the output voltage of the said constant voltage module (10), the said control module (30) is also connected with the said operational amplifier detection module (40), the output end of the said control module (30) is connected with the said constant current module (20), configure to output the signal to the said constant current module (20);
the operational amplifier detection module (40) amplifies the detected voltage of the first resistor (R1) and outputs the amplified voltage to the control module (30), and the control module (30) calculates the input power of the constant current drive circuit according to the detected output voltage of the constant voltage module (10) and the voltage of the first resistor (R1).
2. The constant current driving circuit according to claim 1, wherein the constant current module (20) comprises two voltage dividing resistors, the two voltage dividing resistors are connected in series to the output end of the constant voltage module (10), the analog voltage is obtained by dividing the voltage by the two voltage dividing resistors and is transmitted to the control module (30), and the control module (30) obtains the output voltage of the constant voltage module (10) after conversion.
3. The constant current driving circuit according to claim 1, wherein the constant current module (20) comprises a warm light constant current module and a cold light constant current module connected in parallel to each other for supplying power to the corresponding warm light LED load and cold light LED load, respectively.
4. A constant current driving circuit according to claim 3, wherein the control module (30) outputs two paths of PWM signals, the control module (30) outputs a warm light PWM signal to the warm light constant current module, and the control module (30) outputs a cool light PWM signal to the cool light constant current module.
5. The constant current driving circuit according to claim 1, wherein the operational amplifier detection module (40) comprises an operational amplifier chip (U1), an eleventh resistor (R11) and an eighth resistor (R8), wherein one end of the eleventh resistor (R11) is connected to the first resistor (R1), the other end is connected to an input end of the operational amplifier chip (U1), and an output end of the operational amplifier chip (U1) outputs a current to the control module (30) through the eighth resistor (R8).
6. The constant current drive circuit according to claim 1, wherein the control module (30) is an MCU controller including an ADC configured to convert an analog signal into a digital signal for calculation.
7. The constant current driving circuit according to claim 6, wherein the MCU controller stores a data table, and the MCU controller determines the efficiency value of the corresponding constant voltage module (10) according to an actual duty ratio table lookup to calculate the input power of the constant current driving circuit.
8. The constant current driving circuit according to claim 1, wherein the constant voltage module (10) adopts a flyback isolation architecture, and the constant current module (20) adopts a Buck constant current architecture.
9. A lamp, characterized in that the lamp comprises the constant current driving circuit according to any one of claims 1 to 8.
10. A luminaire as claimed in claim 9, characterized in that the luminaire comprises two light source modules (50) of different color temperatures, the light source modules (50) being connected to the constant current drive circuit by means of a total of 4 wires ledw+, LEDW-, ledc+, LEDC-, wherein ledw+, ledc+ are co-anodic on the constant current drive circuit and are directly connected to the output of the constant voltage module (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321611356.XU CN220123105U (en) | 2023-06-21 | 2023-06-21 | Constant current driving circuit and lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321611356.XU CN220123105U (en) | 2023-06-21 | 2023-06-21 | Constant current driving circuit and lamp |
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| CN220123105U true CN220123105U (en) | 2023-12-01 |
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| CN202321611356.XU Active CN220123105U (en) | 2023-06-21 | 2023-06-21 | Constant current driving circuit and lamp |
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| CN (1) | CN220123105U (en) |
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- 2023-06-21 CN CN202321611356.XU patent/CN220123105U/en active Active
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