CN117098274B - Non-isolated LED driving circuit, LED lighting equipment and system - Google Patents
Non-isolated LED driving circuit, LED lighting equipment and system Download PDFInfo
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- CN117098274B CN117098274B CN202311345291.3A CN202311345291A CN117098274B CN 117098274 B CN117098274 B CN 117098274B CN 202311345291 A CN202311345291 A CN 202311345291A CN 117098274 B CN117098274 B CN 117098274B
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- 238000005070 sampling Methods 0.000 claims description 18
- 230000009467 reduction Effects 0.000 claims description 3
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- 238000013461 design Methods 0.000 description 10
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Classifications
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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
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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]
- H05B45/10—Controlling the intensity of the light
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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
- H05B45/345—Current stabilisation; Maintaining constant current
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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
- H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
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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
- H05B45/37—Converter circuits
Abstract
The invention discloses a non-isolated LED driving circuit, LED lighting equipment and a system, and relates to the technical field of integrated circuits. The non-isolated LED driving circuit carries out rectification and filtering on alternating current input through the rectification and filtering module, corrects a power factor through the output module, realizes constant control of output current, and further realizes control of reduced power at high temperature through the temperature detection module, so that a stable and efficient LED driving circuit is realized.
Description
Technical Field
The present invention relates to the field of integrated circuits, and in particular, to a non-isolated LED driving circuit, an LED lighting device, and a system.
Background
In the current market, LED driving circuits play a vital role as a key component of LED lighting systems. However, many LED driving circuits employ an isolated driving circuit design, which, although ensuring electrical safety, often entails a degree of energy loss due to the isolated nature, thereby limiting the energy efficiency of the LED lighting system. In general, some of the major drawbacks of conventional isolated drive circuit designs:
(1) The energy loss is larger: conventional isolation driving circuits typically require conversion of input power to high frequency ac, followed by isolation and voltage reduction by a transformer. Certain energy losses are generated during this conversion process, thereby reducing the energy efficiency of the overall LED lighting system. The energy waste not only increases the energy cost, but also creates unnecessary burden on the environment.
(2) The volume and the weight are larger: the isolation drive circuit typically needs to include isolation components such as transformers that are relatively bulky and heavy. This limits the design flexibility of the LED lighting system, especially in scenarios requiring a compact spatial layout or a lightweight design, which may lead to inconvenience and unnecessary constraints.
(3) The cost is relatively high: the design of conventional isolation drive circuits involves complex isolation components and circuitry that not only increases manufacturing costs, but also increases maintenance and repair difficulties. This can be an important cost factor for large scale commercial and industrial applications.
(4) The response speed is slower: the response speed of the conventional isolation driving circuit is slow due to the existence of the isolation element and the transformer. This may limit the performance of the system in situations where rapid adjustment of the LED brightness is required, such as applications where response to environmental changes or illumination adjustments are required.
Disclosure of Invention
In view of the above, the embodiments of the present invention provide a non-isolated LED driving circuit, an LED lighting device and a system, which are used for solving the problems of high energy consumption, high cost and slow response caused by the isolated design of the LED driving circuit in the prior art.
In a first aspect, embodiments of the present invention provide a non-isolated LED driving circuit, the circuit including: the power supply module is electrically connected with the temperature detection module, and the rectifying and filtering module at least comprises a first fuse, a first common-mode inductor, a second common-mode inductor, a rectifying bridge, a first capacitor and a second capacitor, and is used for rectifying and filtering alternating current input; the output module comprises a power factor correction unit and a constant current output unit, wherein the power factor correction unit at least comprises a first transformer winding, a first field effect transistor, a second diode and an LED constant current drive controller, and is used for enabling a circuit to realize high power factor and providing direct current for the constant current output unit; the constant current output unit at least comprises a second field effect transistor, a second transformer, a third electrolytic capacitor, a fourth electrolytic capacitor and an operational amplifier, and is used for outputting constant current; the power supply module at least comprises a tenth diode, a fifth electrolytic capacitor and a second winding of a second transformer, and is used for providing a stable direct current source for the LED constant current driving controller and the operational amplifier; the temperature detection module at least comprises an eleventh diode, a twelfth diode, a triode and the operational amplifier, and is used for reducing the voltage of the output of the power supply module and reducing the output power of the output module when over-temperature occurs.
Preferably, in the rectifying and filtering module, a first end of the first fuse is electrically connected with a power input phase line, a second end of the first fuse is electrically connected with a third end of the first common mode inductor, a fourth end of the first common mode inductor is electrically connected with a power input zero line, a first end and a second end of the first common mode inductor are respectively electrically connected with a third end and a fourth end of the second common mode inductor, a first end and a second end of the second common mode inductor are respectively electrically connected with a second end and a third end of the rectifying bridge, and a first end of the rectifying bridge is electrically connected with the output module through an RLC parallel circuit consisting of the first capacitor, the second capacitor, the first resistor and the first inductor.
Preferably, in the power factor correction unit, an input voltage sampling pin of the LED constant current driving controller is electrically connected with the first node through a plurality of series resistors, a first end of the first transformer winding is electrically connected with the first node, a second end of the first transformer winding is electrically connected with an anode of the second diode through a first feedback inductance unit, is electrically connected with a valley detection signal input pin of the LED constant current driving controller through a second resistor and a seventh capacitor, is electrically connected with a drain electrode of the first field effect transistor through a fifth feedback inductance unit, a gate electrode of the first field effect transistor is electrically connected with a gate electrode driving signal pin of the LED constant current driving controller through a seventh diode and a fifteenth resistor which are connected in parallel, a cathode of the second diode is electrically connected with an output voltage sampling pin of the LED constant current driving controller through a plurality of resistors, and the LED constant current driving controller controls the first field effect transistor, the first transformer winding and the second transformer winding in real time according to detection of the input voltage sampling pin and the output voltage sampling pin.
Preferably, in the constant current output unit, a gate of the second field effect transistor is electrically connected with a gate driving signal pin of the LED constant current driving controller through a parallel eighth diode and a twenty-first resistor, a drain of the second field effect transistor is electrically connected with a first end of the second transformer through a third feedback inductance unit, a second end of the second transformer is electrically connected with a second end of the parallel third electrolytic capacitor and a second end of the parallel fourth electrolytic capacitor, a first end of the parallel third electrolytic capacitor and a first end of the parallel fourth electrolytic capacitor are electrically connected with a negative electrode of the second diode of the power factor correction unit, and an output end of the operational amplifier is electrically connected with an analog dimming pin of the LED constant current driving controller.
Preferably, the first feedback inductance unit comprises a first feedback inductance and a second feedback inductance which are connected in parallel, the third feedback inductance unit comprises a fourth feedback inductance and a third feedback inductance which are connected in parallel, and the fifth feedback inductance unit comprises a fifth feedback inductance and a sixth feedback inductance which are connected in parallel.
Preferably, in the power supply module, a negative electrode of the twelfth electrode tube is electrically connected with a first end of a forty-ninth resistor, a second end of the forty-ninth resistor is electrically connected with a first end of a fifth electrolytic capacitor and the VCC end, the second end of the fifth electrolytic capacitor and a second end of a second transformer second winding are both electrically connected with signals, the first end of the second transformer second winding and a positive electrode of the twelfth electrode tube are electrically connected at a second node, the second node is electrically connected with a zero crossing and overvoltage detection pin of the LED constant current driving controller, and the second node is also electrically connected with the temperature detection module.
Preferably, the positive electrode of the eleventh diode is electrically connected to the second node in the power supply module, the negative electrode of the eleventh diode is electrically connected to the first end of the fifty-th resistor, the second end of the fifty-th resistor is electrically connected to the collector electrode of the triode, the sixth electrolytic capacitor is electrically connected between the second end of the fifty-th resistor and the signal ground, the emitter electrode of the triode is electrically connected to the positive input end of the operational amplifier through the fifty-second resistor, the positive input end of the operational amplifier is further electrically connected to the second end of the thermistor, the negative input end of the operational amplifier is grounded through the fifty-fourth resistor, and the output end of the operational amplifier is electrically connected to the analog dimming pin of the LED constant current driving controller through the twelfth diode.
Preferably, the first field effect transistor and the second field effect transistor are both N-channel enhancement type field effect transistors, and the triode is an NPN triode.
In a second aspect, an embodiment of the present invention provides an LED lighting device, which includes the non-isolated LED driving circuit and the LED light source according to the first aspect.
In a third aspect, an embodiment of the present invention provides an LED lighting system, including an LED lighting device according to the second aspect and a controller, wherein the controller is at least configured to control the switching and brightness of the LED lighting device.
In summary, the beneficial effects of the invention are as follows:
according to the non-isolated LED driving circuit, the LED lighting equipment and the system, the rectification filtering module is used for rectifying and filtering alternating current input, the output module is used for correcting power factors, constant control of output current is achieved, and in addition, the temperature detection module is used for achieving control of reducing power at high temperature, so that the stable and efficient LED driving circuit is achieved. Due to simplification of the circuit structure, loss in the energy transmission process can be effectively reduced, response speed and stability of the lighting system can be improved, brightness of the LED can be adjusted more quickly, and more accurate light control effect is achieved.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described, and it is within the scope of the present invention to obtain other drawings according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a non-isolated LED driving circuit according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a non-isolated LED driving circuit according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a rectifying and filtering module according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of an output module according to an embodiment of the present invention.
Fig. 5 is a circuit diagram of a power supply module according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of a temperature detection module according to an embodiment of the invention.
Fig. 7 is a schematic structural view of an LED lighting device according to an embodiment of the present invention.
Fig. 8 is a schematic structural view of an LED lighting system according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely configured to illustrate the invention and are not configured to limit the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by showing examples of the invention.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, 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. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element. The embodiments described below are merely illustrative, and the division of the modules or circuits is merely a logical function division, and other manners of division are possible in practice. In the present embodiment and the drawings, elements irrelevant to the present invention are omitted and not shown, and dimensional relationships among elements in the drawings are only for easy understanding, and are not intended to limit actual proportions.
Example 1
Referring to fig. 1, an embodiment of the present invention provides a non-isolated LED driving circuit, which includes: the power supply device comprises a rectifying and filtering module 1, an output module 2, a power supply module 3 and a temperature detection module 4, wherein the rectifying and filtering module 1, the power supply module 3 and the temperature detection module 4 are respectively and electrically connected with the output module 2, and the power supply module 3 is electrically connected with the temperature detection module 4. As shown in fig. 2, a specific circuit diagram of the non-isolated LED driving circuit is shown. The rectifying and filtering module 1 at least comprises a first fuse F1, a first common-mode inductor LF1, a second common-mode inductor LF2, a rectifying bridge DB1, a first capacitor C1 and a second capacitor C2, and is configured to rectify and filter an Alternating Current (AC) input, and convert the Alternating Current (AC) voltage into a Direct Current (DC) pulse voltage with 2 times of AC frequency. The output module 2 comprises a power factor correction unit and a constant current output unit, wherein the power factor correction unit at least comprises a first transformer winding T1, a first field effect transistor Q1, a second diode D2 and an LED constant current drive controller U1, and is used for enabling a circuit to achieve a high power factor and providing direct current for the constant current output unit, and the constant current output unit at least comprises a second field effect transistor Q2, a second transformer T2, a third electrolytic capacitor CE3, a fourth electrolytic capacitor CE4 and an operational amplifier U2, and is used for outputting constant current; the power supply module 3 at least comprises a tenth diode D10, a fifth electrolytic capacitor CE5 and a second winding of a second transformer, and is configured to provide a stable direct current source for the LED constant current driving controller U1 and the operational amplifier U2; the temperature detection module 4 at least comprises an eleventh diode D11, a twelfth diode D12, a third triode Q3 and the operational amplifier U2, and is configured to step down the output of the power supply module 3 and reduce the output power of the output module 2 when an over-temperature occurs.
Preferably, as shown in fig. 3, in the rectifying and filtering module 1, a first end of the first fuse F1 is electrically connected to the power input phase line L, a second end of the first fuse F1 is electrically connected to a third end of the first common mode inductor LF1, a fourth end of the first common mode inductor LF1 is electrically connected to the power input zero line N, a first end and a second end of the first common mode inductor LF1 are respectively electrically connected to a third end and a fourth end of the second common mode inductor LF2, a first end and a second end of the second common mode inductor LF2 are respectively electrically connected to a second end and a third end of the rectifying bridge, and a first end of the rectifying bridge is electrically connected to the output module 2 through an RLC parallel circuit composed of the first capacitor C1, the second capacitor C2, the first resistor R1 and the first inductor L1. The alternating current input from the power input phase line L and the zero line N passes through a rectification filter circuit consisting of a first fuse F1, a first common-mode inductor LF1, a second common-mode inductor LF2, a rectifier bridge DB1, a first capacitor C1 and a second capacitor C2, and then outputs DC pulse voltage with the frequency twice that of the original alternating current voltage.
Preferably, a first variable resistor RV1 and a capacitor CX1 are connected in parallel between the first melter F1 and the N line to realize filtering and adjusting functions, so that interference signals are effectively filtered, stability and performance of a circuit are improved, and specific requirements are met by adjusting parameters of the first variable resistor RV 1. Preferably, a plurality of varistors and variable resistors are connected in series from the power input ground (PE line) to remove ground and electrical disturbances and improve electrical performance. Preferably, a plurality of resistors are connected between the third end and the fourth end of the second common-mode inductor LF2, and the first end and the second end, so as to reduce the interference of the working mode and improve the signal quality.
Preferably, in the power factor correction unit of the output module 2 shown in fig. 4, the LED constant current driving controller U1 selects a type BP3368B chip, where the BP3368B chip includes a high-voltage input pin HV, a floating pin NC, a front stage Boost valley detection signal input pin ZCD (hereinafter referred to as a valley detection signal input pin or ZCD pin), a front stage Boost GATE driving signal pin GATE1 (hereinafter referred to as a GATE driving signal pin), a front stage Boost current sampling pin CSI, a front stage Boost power ground pin PGND1, a PWN dimming pin PWN, an input voltage sampling pin INFB, a rear stage Buck zero crossing and OVP detection pin FB (hereinafter referred to as a zero crossing and overvoltage detection pin), a front stage Boost output voltage sampling pin BFB (hereinafter referred to as an output voltage sampling pin), a front stage Boost loop compensation pin COMP, an analog dimming pin DIM, a rear stage Buck power ground and signal ground pin PGND2, a rear stage Buck current pin MOSFET CS2, a rear stage Buck MOSFET GATE driving signal pin GATE driving signal GATE2 (hereinafter referred to as a GATE driving signal pin VCC). The functional electrical parameters of each pin are referred to the chip product specification, and will not be described herein.
The output node of the rectifying and filtering module 1, namely a first node 11, is electrically connected with an input voltage sampling pin INFB of the LED constant current driving controller U1 through three series resistors (a tenth resistor R10, a seventeenth resistor R17 and a thirty-first resistor R31), on the other hand, a first end of the first transformer winding T1 is electrically connected with a first node 11 of the rectifying and filtering module 1, a second end of the first transformer winding T1 is electrically connected with an anode of the second diode D2 through a first feedback inductance unit (comprising a first feedback inductance FB1 and a second feedback inductance FB2 which are connected in parallel), and is also electrically connected with a valley bottom detection signal input pin ZCD of the LED constant current driving controller U1 through a second resistor R2 and a seventh capacitor C7, and is also electrically connected with a drain of the first field effect transistor Q1 through a fifth feedback inductance unit (comprising a fifth feedback inductance FB5 and a sixth feedback inductance 6), a grid of the first field effect transistor Q1 is electrically connected with a drain of the first field effect transistor Q1 through a first feedback inductance unit (comprising a first feedback inductance FB1 and a second feedback inductance FB 2) in parallel, and is connected with an output voltage sampling pin ZCD of the LED constant current driving controller U1 through a second resistor B1 and a valley bottom detection signal input pin ZCD of the LED constant current driving controller U1, and the drain of the LED constant current driving controller U1 is connected with the drain of the first field effect transistor Q1 through a second feedback inductance B1. In the output module 2, the working states of the first field effect transistor Q1, the first transformer T1 and the second diode D2 can be controlled in real time through the detection of the INFB pin and the BFB pin in the LED constant current driving controller U1, so that the circuit realizes a high power factor, and meanwhile, the high power factor is filtered into direct current through the second electrolytic capacitor CE2 and is provided for a constant current input unit consisting of the second field effect transistor, the second transformer T2, the third electrolytic capacitor CE3, the fourth electrolytic capacitor CE4 and the operational amplifier U2. Preferably, the model of the operational amplifier is LM321. The first field effect transistor and the second field effect transistor are N-channel enhancement type field effect transistors.
Referring to fig. 2, the output module 2 includes a power factor correction unit and a constant current output unit, where the power factor correction unit includes at least a first transformer winding T1, a first field effect transistor Q1, a second diode D2, and an LED constant current driving controller U1, for enabling a circuit to achieve a high power factor and providing a direct current for the constant current output unit, and the constant current output unit includes at least a second field effect transistor Q2, a second transformer T2, a third electrolytic capacitor CE3, a fourth electrolytic capacitor CE4, and an operational amplifier U2, for outputting a constant current. In the constant current output unit, the GATE of the second field effect transistor Q2 is electrically connected to the GATE driving signal pin GATE2 of the LED constant current driving controller U1 through a parallel eighth diode D8 and a twenty-first resistor R20, the drain of the second field effect transistor Q2 is electrically connected to the cathode of the second diode D2 of the power factor correction unit through a third feedback inductance unit (including a parallel fourth feedback inductance FB4 and a third feedback inductance FB 5) and a parallel fifth diode D5 and a parallel sixth diode D6, the first end of the second transformer T2 is electrically connected to the third feedback inductance unit (including a parallel fourth feedback inductance FB4 and a third feedback inductance FB 5), the second end of the second transformer T2 is electrically connected to the parallel second electrolytic capacitance CE3 and the second end of the fourth electrolytic capacitance CE4, the first end of the parallel third electrolytic capacitance CE3 and the first end of the fourth electrolytic capacitance CE4 are electrically connected to the cathode of the second diode D2 of the power factor correction unit, and the second end of the parallel third electrolytic capacitance CE4 is electrically connected to the output pin D1 of the LED constant current driving controller U1. The operational amplifier U2 can control the current output to the LED by detecting the loop current of the second field effect transistor, and the current is determined by the driving duty ratio of the operational amplifier U2 to the second field effect transistor.
Preferably, referring to fig. 5, at least the twelfth electrode tube D10, the fifth electrolytic capacitor CE5, and the second winding T2B of the second transformer form a power supply module 3 for power-taking rectifying and filtering, and a stable direct current source is provided for the LED constant current driving controller U1 and the operational amplifier U2. In the power supply module 3, the negative electrode of the twelfth electrode tube D10 is electrically connected to the VCC terminal through a forty-ninth resistor R49, the positive electrode of the twelfth electrode tube D10 is electrically connected to the first end of the second winding T2B of the second transformer, the second end of the second winding T2B of the second transformer is electrically connected to the second end of the fifth electrolytic capacitor CE5, the first end of the fifth electrolytic capacitor CE5 is electrically connected to the VCC terminal, the second end of the fifth electrolytic capacitor CE5 is electrically connected to the second end of the second winding T2B of the second transformer, the first end of the second winding T2B of the second transformer is electrically connected to the positive electrode of the twelfth electrode tube D10 at a second node 31, the second node 31 is electrically connected to the overvoltage detection pin FB of the LED constant current driving controller U1, and the second node 31 is further electrically connected to the temperature detection module 4 to provide the dc source U2.
Preferably, as shown in fig. 6, in the temperature detection module 4, the positive electrode of the eleventh diode D11 is electrically connected to the second node 31 in the power supply module 3, the negative electrode of the eleventh diode D11 is electrically connected to the first end of the fifty-th resistor R50, the second end of the fifty-th resistor R50 is electrically connected to the collector of the triode Q3, the sixth electrolytic capacitor CE6 is electrically connected between the second end of the fifty-th resistor and the signal ground GND, the emitter of the triode is electrically connected to the positive input end of the operational amplifier U2 via the fifty-second resistor R52, the positive input end of the operational amplifier U2 is electrically connected to the second end of the thermistor RT1, the first end of the thermistor RT1 is electrically connected to the signal ground, the negative input end of the operational amplifier is electrically connected to the ground via the fifty-fourth resistor R54, and the output end of the operational amplifier U2 is electrically connected to the analog dimming pin DIM of the LED constant current driving controller U1. The eleventh diode D11, the sixth electrolytic capacitor CE6, and the triode Q3 form a voltage stabilizing circuit, and step down the voltage provided by the power supply module 3; the temperature detected by the operational amplifier U2 through the hot resistor RT1 is compared, when the temperature reaches a set threshold value, the operational amplifier U2 controls the twelfth diode to be connected to the analog dimming pin DIM of the LED constant current driving controller U1, and the output module 2 controlled by the LED constant current driving controller U1 is subjected to power reduction by adjusting the level of the analog dimming pin DIM, so that the function of reducing the output power by over temperature is realized.
In summary, according to the non-isolated LED driving circuit of the embodiment of the present invention, the rectification filtering module 1 rectifies and filters the ac input, the output module 2 corrects the power factor, and realizes constant control of the output current, and the temperature detection module 4 further realizes control of reducing power at high temperature, thereby realizing a stable and efficient LED driving circuit.
The non-isolated LED driving circuit of the embodiment reduces energy loss as much as possible on the premise of ensuring electrical safety, thereby realizing a more efficient electro-optical conversion process, simplifying design, reducing parts and complexity required in a plurality of traditional isolated circuits, being beneficial to reducing manufacturing cost, improving reliability of a system and reducing potential fault points. Due to simplification of the circuit structure, loss in the energy transmission process can be effectively reduced, and meanwhile, the non-isolated LED driving circuit is also beneficial to improving the response speed and stability of the lighting system, so that the brightness of the LED can be adjusted more quickly, and a more accurate light control effect is realized.
Example two
As shown in fig. 7, a second embodiment of the present invention provides an LED lighting device, which includes the non-isolated LED driving circuit and the load LED light source according to the first embodiment.
The non-isolated LED driving circuit includes: the power supply device comprises a rectifying and filtering module 1, an output module 2, a power supply module 3 and a temperature detection module 4, wherein the rectifying and filtering module 1, the power supply module 3 and the temperature detection module 4 are respectively and electrically connected with the output module 2, the power supply module 3 and the temperature detection module 4 are electrically connected, and the rectifying and filtering module 1 at least comprises a first fuse F1, a first common-mode inductor LF1, a second common-mode inductor LF2, a rectifying bridge DB1, a first capacitor C1 and a second capacitor C2, and is used for rectifying and filtering alternating current input; the output module 2 comprises a power factor correction unit and a constant current output unit, wherein the power factor correction unit at least comprises a first transformer winding T1, a first field effect transistor Q1, a second diode D2 and an LED constant current drive controller U1, and is used for enabling a circuit to achieve a high power factor and providing direct current for the constant current output unit, and the constant current output unit at least comprises a second field effect transistor Q2, a second transformer T2, a third electrolytic capacitor CE3, a fourth electrolytic capacitor CE4 and an operational amplifier U2, and is used for outputting constant current; the power supply module 3 at least comprises a tenth diode D10, a fifth electrolytic capacitor CE5 and a second winding of a second transformer, and is configured to provide a stable direct current source for the LED constant current driving controller U1 and the operational amplifier U2; the temperature detection module 4 at least comprises an eleventh diode D11, a twelfth diode D12, a third triode Q3 and the operational amplifier U2, and is configured to step down the output of the power supply module 3 and reduce the output power of the output module 2 when an over-temperature occurs.
The non-isolated LED driving device can reduce energy loss as much as possible on the premise of ensuring electrical safety, so that a more efficient electro-optical conversion process is realized, the design is simplified, the parts and complexity of the device are reduced, the manufacturing cost is reduced, the reliability of the device is improved, and potential fault points are reduced.
Example III
As shown in fig. 8, a third embodiment of the present invention provides an LED lighting system, where the device includes the LED lighting device according to the second embodiment and a controller for controlling at least the switching and brightness of the LED device. Wherein the LED lighting device comprises at least a non-isolated LED driving circuit and an LED light source as described in embodiment one.
The non-isolated LED driving circuit includes: the power supply device comprises a rectifying and filtering module 1, an output module 2, a power supply module 3 and a temperature detection module 4, wherein the rectifying and filtering module 1, the power supply module 3 and the temperature detection module 4 are respectively and electrically connected with the output module 2, the power supply module 3 and the temperature detection module 4 are electrically connected, and the rectifying and filtering module 1 at least comprises a first fuse F1, a first common-mode inductor LF1, a second common-mode inductor LF2, a rectifying bridge DB1, a first capacitor C1 and a second capacitor C2, and is used for rectifying and filtering alternating current input; the output module 2 comprises a power factor correction unit and a constant current output unit, wherein the power factor correction unit at least comprises a first transformer winding T1, a first field effect transistor Q1, a second diode D2 and an LED constant current drive controller U1, and is used for enabling a circuit to achieve a high power factor and providing direct current for the constant current output unit, and the constant current output unit at least comprises a second field effect transistor Q2, a second transformer T2, a third electrolytic capacitor CE3, a fourth electrolytic capacitor CE4 and an operational amplifier U2, and is used for outputting constant current; the power supply module 3 at least comprises a tenth diode D10, a fifth electrolytic capacitor CE5 and a second winding of a second transformer, and is configured to provide a stable direct current source for the LED constant current driving controller U1 and the operational amplifier U2; the temperature detection module 4 at least comprises an eleventh diode D11, a twelfth diode D12, a third triode Q3 and the operational amplifier U2, and is configured to step down the output of the power supply module 3 and reduce the output power of the output module 2 when an over-temperature occurs.
The LED lighting system can reduce energy loss as much as possible on the premise of ensuring electrical safety, so that a more efficient electro-optical conversion process is realized, the design is simplified, the complexity of the whole lighting system is reduced, the manufacturing cost is reduced, the reliability of the lighting system is improved, and potential fault points are reduced.
The non-isolated LED driving circuits provided by the present invention have been described in detail above, and those of skill in the art will further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular use and design constraints imposed on the overall system. Those skilled in the art can implement the described functionality in varying ways for each particular application, such as by making use of equivalent structures or equivalent flow transformations by the present description and drawings, or by direct or indirect application to other relevant technical fields, as well as such are intended to be encompassed within the scope of the present invention. And should not be construed as limiting the invention.
In the foregoing, only the specific embodiments of the present invention are described, and it will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, modules and units described above may refer to the corresponding processes in the foregoing method embodiments, which are not repeated herein. It should be understood that the scope of the present invention is not limited thereto, and any equivalent modifications or substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and they should be included in the scope of the present invention.
Claims (10)
1. A non-isolated LED driver circuit, the driver circuit comprising: the power supply module is electrically connected with the temperature detection module, and the rectifying and filtering module at least comprises a first fuse, a first common-mode inductor, a second common-mode inductor, a rectifying bridge, a first capacitor and a second capacitor, and is used for rectifying and filtering alternating current input; the output module comprises a power factor correction unit and a constant current output unit, wherein the power factor correction unit at least comprises a first transformer winding, a first field effect transistor, a second diode and an LED constant current drive controller, and is used for enabling a circuit to realize high power factor and providing direct current for the constant current output unit; the constant current output unit at least comprises a second field effect tube, a second transformer, a third electrolytic capacitor, a fourth electrolytic capacitor and an operational amplifier, and is used for outputting constant current, wherein in the output module, the LED constant current drive controller comprises an input voltage sampling pin, an output voltage sampling pin and an analog dimming pin, and the working states of the first field effect tube, the first transformer winding and the second diode are controlled in real time through the detection of the input voltage sampling pin and the output voltage sampling pin, so that the high power factor of the circuit is realized; the power supply module at least comprises a tenth diode, a fifth electrolytic capacitor and a second winding of a second transformer, and is used for providing a stable direct current source for the LED constant current driving controller and the operational amplifier; the temperature detection module at least comprises an eleventh diode, a twelfth diode, a triode, the operational amplifier and a sixth electrolytic capacitor, and is used for reducing the output of the power supply module and reducing the output power of the output module when overtemperature occurs, wherein the eleventh diode, the sixth electrolytic capacitor and the triode form a voltage stabilizing circuit, and the voltage stabilizing circuit is used for reducing the voltage provided by the power supply module; the output end of the operational amplifier is electrically connected with an analog dimming pin of the LED constant current driving controller through the twelfth diode, when the temperature reaches a preset threshold value, the operational amplifier controls the twelfth diode to be connected to the LED constant current driving controller, and power reduction is carried out on the output module by adjusting the level of the analog dimming pin.
2. The non-isolated LED driver circuit of claim 1, wherein in the rectifying and filtering module, a first end of the first fuse is electrically connected to a power input phase line, a second end of the first fuse is electrically connected to a third end of the first common mode inductor, a fourth end of the first common mode inductor is electrically connected to a power input zero line, a first end and a second end of the first common mode inductor are respectively electrically connected to a third end and a fourth end of the second common mode inductor, a first end and a second end of the second common mode inductor are respectively electrically connected to a second end and a third end of the rectifying bridge, and a first end of the rectifying bridge is electrically connected to the output module through an RLC parallel circuit composed of the first capacitor, the second capacitor, the first resistor and the first inductor.
3. The non-isolated LED driving circuit according to claim 2, wherein in the power factor correction unit, an input voltage sampling pin of the LED constant current driving controller is electrically connected to the first node through a plurality of series resistors, a first end of the first transformer winding is electrically connected to the first node, a second end of the first transformer winding is electrically connected to an anode of the second diode through a first feedback inductance unit, is electrically connected to a valley detection signal input pin of the LED constant current driving controller through a second resistor and a seventh capacitor, is electrically connected to a drain electrode of the first field effect transistor through a fifth feedback inductance unit, a gate electrode of the first field effect transistor is electrically connected to a gate electrode driving signal pin of the LED constant current driving controller through a seventh diode and a fifteenth resistor connected in parallel, a cathode of the second diode is electrically connected to an output voltage sampling pin of the LED constant current driving controller through a plurality of resistors, and the LED constant current driving controller controls the first field effect transistor, the first field effect transistor and the real-time state of operation of the first field effect transistor according to the input voltage sampling pin and the output voltage sampling pin.
4. The non-isolated LED driving circuit according to claim 3, wherein in the constant current output unit, a gate of the second field effect transistor is electrically connected to a gate driving signal pin of the LED constant current driving controller through an eighth diode and a twentieth resistor connected in parallel, a drain of the second field effect transistor is electrically connected to a first end of the second transformer through a third feedback inductance unit, a second end of the second transformer is electrically connected to a second end of a third electrolytic capacitor and a fourth electrolytic capacitor connected in parallel, a first end of the third electrolytic capacitor and the fourth electrolytic capacitor connected in parallel are electrically connected to a negative electrode of a second diode of the power factor correction unit, and an output end of the operational amplifier is electrically connected to an analog dimming pin of the LED constant current driving controller.
5. The non-isolated LED driving circuit of claim 4, wherein the first feedback inductance unit comprises a first feedback inductance and a second feedback inductance in parallel, the third feedback inductance unit comprises a fourth feedback inductance and a third feedback inductance in parallel, and the fifth feedback inductance unit comprises a fifth feedback inductance and a sixth feedback inductance in parallel.
6. The non-isolated LED driving circuit of any of claims 1-5, wherein in the power supply module, the negative pole of the twelfth pole tube is electrically connected to the first end of a forty-ninth resistor, the second end of the forty-ninth resistor is electrically connected to the first end and VCC end of a fifth electrolytic capacitor, the second end of the fifth electrolytic capacitor and the second end of the second winding of the second transformer are both electrically connected to signals, the first end of the second winding of the second transformer is electrically connected to the positive pole of the twelfth pole tube at a second node, the second node is electrically connected to zero crossing and overvoltage detection pins of the LED constant current driving controller, and the second node is also electrically connected to the temperature detection module.
7. The non-isolated LED driver circuit of claim 6, wherein the positive electrode of the eleventh diode is electrically connected to the second node in the power supply module, the negative electrode of the eleventh diode is electrically connected to the first end of the fifty-th resistor, the second end of the fifty-th resistor is electrically connected to the collector of the triode, the sixth electrolytic capacitor is electrically connected between the second end of the fifty-th resistor and signal ground, the emitter of the triode is electrically connected to the positive input of the operational amplifier via the fifty-second resistor, the positive input of the operational amplifier is also electrically connected to the second end of the thermistor, the negative input of the operational amplifier is grounded via the fifty-fourth resistor, and the output of the operational amplifier is electrically connected to the analog dimming pin of the LED constant current driver controller via the twelfth diode.
8. The non-isolated LED driver circuit of claim 7, wherein the first and second field effect transistors are both N-channel enhancement mode field effect transistors and the transistor is an NPN transistor.
9. An LED lighting device, characterized in that the device comprises a non-isolated LED driving circuit according to any of claims 1 to 8 and at least one LED light source.
10. An LED lighting system comprising the LED lighting device of claim 9 and a controller, wherein the controller is configured to control at least the switching and brightness of the LED lighting device.
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| CN117098274A (en) | 2023-11-21 |
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