CN110267391B - LED polarity identification circuit and LED lamp with same - Google Patents
LED polarity identification circuit and LED lamp with same Download PDFInfo
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- CN110267391B CN110267391B CN201910471458.8A CN201910471458A CN110267391B CN 110267391 B CN110267391 B CN 110267391B CN 201910471458 A CN201910471458 A CN 201910471458A CN 110267391 B CN110267391 B CN 110267391B
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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
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses a LED polarity identification circuit, comprising: the H-bridge switch module is provided with a first output end and a second output end, and the first output end and the second output end are used for being connected with the LED assembly; the load detection module is used for detecting whether the LED assembly works or not so as to generate a voltage detection signal; the control module is respectively connected with the H-bridge switch module and the load detection module, and is used for controlling the H-bridge switch module, so that the first output end and the second output end alternately output driving voltage signals to the LED assembly, whether the LED assembly works currently is judged according to the voltage detection signals, the LED assembly is identified to be in a correct polarity connection state currently when the LED assembly works currently, the output of the first output end or the second output end is locked by controlling the H-bridge switch module, the polarity of the LED assembly connected can be automatically identified, and the universality of the lamp is greatly improved. The invention also discloses an LED lamp.
Description
Technical Field
The invention relates to the technical field of lighting, in particular to an LED polarity identification circuit and an LED lamp with the same.
Background
The LED light source belongs to a typical green lighting source and is widely applied to the field of lighting at present. However, considering that the LED light source is a unidirectional conductive semiconductor device, the output of the driving power source needs to be matched with the positive and negative polarities of the LED light source, otherwise the LED light source does not emit light, so the LED lamp generally needs to indicate the positive and negative polarities of the output, or needs to adopt a specific interface for docking.
However, the interfaces of the LED lamps manufactured by various manufacturers are not in a uniform standard, so that the interfaces of the LED lamps on the market are diversified, the sharing among the LED lamps is low, and thus, the existing LED lamp fittings cannot be reasonably used for replacement after the LED lamp holders and the LED light source assemblies are damaged randomly and the like, so that a large amount of electronic waste is generated, and the resource waste phenomenon is very serious.
Disclosure of Invention
The present invention is directed to solving at least one of the technical problems in the art to some extent. Therefore, an object of the present invention is to provide an LED polarity identification circuit, which can automatically identify the polarity of an LED module, and adjust a driving voltage signal output to the LED module according to the polarity of the LED module, so that the LED module can stably operate without requiring the LED lamp to be equipped with a specific interface and a polarity mark for distinguishing, thereby greatly improving the commonality of the LED lamp, reducing the generation of electronic waste, and avoiding the waste of resources.
Another objective of the present invention is to provide an LED lamp.
In order to achieve the above object, an embodiment of the present invention provides an LED polarity identification circuit, which includes: the H-bridge switch module is provided with a first output end and a second output end, and the first output end and the second output end are used for connecting the LED assembly; the load detection module is used for detecting whether the LED assembly works or not so as to generate a voltage detection signal; the control module is respectively connected with the H-bridge switch module and the load detection module, and is used for controlling the H-bridge switch module so that the first output end and the second output end alternately output driving voltage signals to the LED assembly, judging whether the LED assembly works currently according to the voltage detection signals, identifying that the LED assembly is in a correct polarity connection state currently when the LED assembly works currently, and locking the output of the first output end or the second output end by controlling the H-bridge switch module.
According to the LED polarity identification circuit provided by the embodiment of the invention, the H-bridge switch module and the load detection module are arranged, so that the control module can enable the first output end and the second output end of the H-bridge switch module to alternately output driving voltage signals to the LED assembly by controlling the H-bridge switch module, judge whether the LED assembly is currently working or not according to the voltage detection signals, identify that the LED assembly is currently in a correct polarity connection state when the LED assembly is currently working, accurately identify the polarity of the connected LED assembly, and lock the output of the first output end or the second output end by controlling the H-bridge switch module to ensure that the LED assembly stably works in the correct polarity connection state, so that the LED lamp is not required to be provided with a specific interface and a polarity mark for distinguishing, the universality of the LED lamp is greatly improved, the generation of electronic waste is reduced, and the resource waste is avoided.
In addition, the LED polarity identification circuit proposed according to the above embodiment of the present invention may further have the following additional technical features:
specifically, the H-bridge switch module comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first diode and a second diode, wherein a source electrode of the first switch tube is connected to a positive electrode terminal of a direct-current power supply, a gate electrode of the first switch tube is connected to a first signal output end of the control module, a drain electrode of the first switch tube is connected to a drain electrode of the fourth switch tube and has a first node, and the first node is used as the first output end; a source electrode of the second switching tube is connected with an anode electrode of the second diode, a grid electrode of the second switching tube is connected with a second signal output end of the control module, a drain electrode of the second switching tube is connected with a drain electrode of the third switching tube and is provided with a second node, and the second node is used as the second output end; the source electrode of the third switching tube is connected with the source electrode of the first switching tube, and the grid electrode of the third switching tube is connected with the third signal output end of the control module; a source electrode of the fourth switching tube is connected with an anode of the first diode, and a grid electrode of the fourth switching tube is connected with a fourth signal output end of the control module; and the cathode of the first diode is connected with the cathode of the second diode and then is respectively connected with the control module and the load detection module.
Specifically, the first switching tube and the third switching tube respectively include a PMOS tube and a freewheeling diode, and the second switching tube and the fourth switching tube respectively include an NMOS tube and a freewheeling diode.
Optionally, the load detection module includes: and one end of the detection resistor is respectively connected with the cathode of the first diode and the cathode of the second diode and is provided with a detection node, and the other end of the detection resistor is grounded.
Optionally, the control module comprises: one end of the first resistor is connected with the positive electrode end of the direct-current power supply and the source electrode of the first switching tube respectively; a collector of the first triode is connected with the other end of the first resistor and is provided with a third node, the third node is used as a first signal output end of the control module, and an emitter of the first triode is grounded; one end of the second resistor is connected with the base electrode of the first triode; one end of the third resistor is connected with the other end of the second resistor, and the other end of the third resistor is grounded; one end of the fourth resistor is connected with the positive end of the direct-current power supply and the source electrode of the third switching tube respectively; a collector of the second triode is connected with the other end of the fourth resistor and is provided with a fourth node, the fourth node is used as a third signal output end of the control module, and an emitter of the second triode is grounded; one end of the fifth resistor is connected with the base electrode of the second triode; one end of the sixth resistor is connected with the other end of the fifth resistor, and the other end of the sixth resistor is grounded; and a controller, wherein a first control output pin of the controller is respectively connected with one end of the third resistor and the other end of the second resistor, a second control output pin of the controller is used as a second signal output end of the control module, a third control output pin of the controller is respectively connected with one end of the sixth resistor and the other end of the fifth resistor, a fourth control output pin of the controller is used as a second signal output end of the control module, and a feedback pin of the controller is connected with the detection node.
Further, the output level signals of the first control output pin and the second control output pin of the controller are kept the same, and the output level signals of the third control output pin and the fourth control output pin of the controller are kept the same.
Optionally, the LED polarity identification circuit further includes a voltage stabilization module, the voltage stabilization module is connected to a positive terminal of the dc power supply, and the voltage stabilization module is configured to perform voltage stabilization processing on the output voltage of the dc power supply to output a stabilized voltage power supply, and provide the stabilized voltage power supply to the controller in the control module.
Specifically, the voltage stabilization module includes: the positive end of the first electrolytic capacitor is connected with the positive end of the direct-current power supply, and the negative end of the first electrolytic capacitor is grounded; an input pin of the voltage stabilizing chip is respectively connected with the positive terminal of the first electrolytic capacitor and the positive terminal of the direct current power supply, and an output pin of the voltage stabilizing chip is connected with a power supply pin of the controller; and the positive end of the second electrolytic capacitor is connected with the output pin of the voltage stabilizing chip, and the negative end of the second electrolytic capacitor is grounded.
In order to achieve the above object, an embodiment of another aspect of the present invention further provides an LED lamp, which includes the above LED polarity identification circuit.
According to the LED lamp provided by the embodiment of the invention, the polarity of the LED component can be accurately identified through the LED polarity identification circuit, and the output of the first output end or the second output end is locked through controlling the H-bridge switch module, so that the LED component is ensured to stably work in a correct polarity connection state, a specific interface and a polarity mark are not required to be equipped for polarity distinguishing, the universality of the lamp is greatly improved, the generation of electronic waste is reduced, and the waste of resources is avoided.
Drawings
FIG. 1 is a block diagram of an LED polarity identification circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an LED polarity identification circuit according to one embodiment of the present invention;
fig. 3 is a block diagram of an LED lamp according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
The LED polarity identification circuit and the LED lamp having the LED polarity identification circuit according to the embodiments of the present invention are described below with reference to the accompanying drawings.
Referring to fig. 1 and 2, an LED polarity identification circuit according to an embodiment of the present invention includes an H-bridge switch module 10, a load detection module 20, and a control module 30.
The H-bridge switch module 10 has a first output end LEDA and a second output end LEDB, where the first output end LEDA and the second output end LEDB are used to connect the LED assembly 40, that is, the two output ends of the H-bridge switch module 10 can be arbitrarily connected to the positive and negative electrodes of the LED assembly.
The load detection module 20 is used for detecting whether the connected LED assembly 40 is operated to generate a voltage detection signal. That is, when the LED assembly 40 is connected to operate normally, the LED assembly 40 emits light, and the load detection module 20 generates a voltage detection signal by detecting a current flowing through the LED assembly.
The control module 30 is respectively connected to the H-bridge switch module 10 and the load detection module 20, the control module 30 is configured to control the H-bridge switch module 10, so that the first output end LEDA and the second output end LEDB alternately output a driving voltage signal to the LED assembly 40, that is, when the first output end LEDA outputs the driving voltage signal to the LED assembly 40, if the first output end LEDA is connected to the positive end of the LED assembly 40 and the second output end LEDB is connected to the negative end of the LED assembly 40, the first output end LEDA, the LED assembly, and the second output end LEDB form an energizing loop, and the LED assembly 40 operates; when the second output end LEDB outputs a driving voltage signal to the LED assembly 40, if the first output end LEDA is connected to the negative end of the LED assembly 40, and the second output end LEDB is connected to the positive end of the LED assembly 40, at this time, the second output end LEDB, the LED assembly, and the first output end LEDA form an energization loop, the LED assembly 40 can also work, the control module 30 determines whether the LED assembly is currently working according to the voltage detection signal, and identifies that the LED assembly is currently in a correct polarity connection state when the LED assembly is currently working, so as to accurately identify the polarity of the LED assembly, and lock the output of the first output end LEDA or the second output end LEDB by controlling the H-bridge switch module 10, so that the first output end LEDA or the second output end LEDB continuously outputs the driving voltage signal, and ensure stable working of the LED assembly.
That is to say, the LED polarity identification circuit according to the embodiment of the present invention, through controlling the H-bridge switch module 10, can enable the first output terminal LEDA and the second output terminal LEDB to alternately apply the driving voltage signal to the connected LED assembly, so that the LED assembly can operate regardless of the polarity of the connected LED assembly, and detect that the LED assembly is operating through the load detection module 20, which indicates that the polarity of the connected LED assembly is adapted to the driving voltage signal applied to the LED assembly at this time, and the LED assembly is determined to be in the correct polarity connection state and can continuously operate, and then through controlling the H-bridge switch module 10, the driving voltage signal applied to the LED assembly at this time is locked, so that the LED assembly is continuously and stably operated, and the polarity of the LED assembly can be disregarded, so that the LED lamp is not required to be equipped with a specific interface and a polarity label for polarity discrimination, and the commonality of the LED lamp is greatly improved.
According to an embodiment of the present invention, as shown in fig. 2, the H-bridge switch module 10 includes a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a first diode D1 and a second diode D2, wherein a source of the first switch tube Q1 is connected to a positive terminal of the dc power supply, a gate of the first switch tube Q1 is connected to a first signal output terminal of the control module 30, a drain of the first switch tube Q1 is connected to a drain of the fourth switch tube Q4 and has a first node, and the first node is used as a first output terminal LEDA; a source electrode of the second switching tube Q2 is connected to an anode electrode of the second diode D2, a gate electrode of the second switching tube Q2 is connected to a second signal output end of the control module 30, a drain electrode of the second switching tube Q2 is connected to a drain electrode of the third switching tube Q3 and has a second node, and the second node is used as a second output end LEDB; the source electrode of the third switching tube Q3 is connected with the source electrode of the first switching tube Q1, and the grid electrode of the third switching tube Q3 is connected with the third signal output end of the control module 30; the source of the fourth switching tube Q4 is connected to the anode of the first diode D1, and the gate of the fourth switching tube Q4 is connected to the fourth signal output terminal of the control module 30; the cathode of the first diode D1 is connected to the cathode of the second diode D2, and then connected to the control module 30 and the load detection module 20, respectively.
Specifically, the first switching tube Q1 and the third switching tube Q3 respectively include a PMOS tube and a freewheeling diode, and the second switching tube Q2 and the fourth switching tube Q4 respectively include an NMOS tube and a freewheeling diode. Thus, when a low level signal is applied to the gates of the first switching transistor Q1 and the third switching transistor Q3, the first switching transistor Q1 and the third switching transistor Q3 are turned on, and when a high level signal is applied to the gates of the second switching transistor Q2 and the fourth switching transistor Q4, the second switching transistor Q2 and the fourth switching transistor Q4 are turned on.
According to an embodiment of the present invention, as shown in fig. 2, the load detection module 20 includes a detection resistor RS having one end connected to the cathode of the first diode D1 and the cathode of the second diode D2, respectively, and having a detection node, and connected to the control module 30 through the detection node, and the other end of the detection resistor RS is grounded.
The voltage of the detection node is transmitted to the control module 30 as a voltage detection signal, so that the control module 30 can conveniently judge whether the accessed LED assembly is currently working.
Specifically, according to an embodiment of the present invention, as shown in fig. 2, the control module 30 includes a first resistor R1, a first transistor V1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second transistor V1, and a controller IC2.
One end of the first resistor R1 is connected to the positive terminal of the dc power supply and the source of the first switching tube Q1, the collector of the first triode V1 is connected to the other end of the first resistor R1 and has a third node, the third node is used as the first signal output end of the control module 30, the emitter of the first triode V1 is grounded, one end of the second resistor R2 is connected to the base of the first triode V1, one end of the third resistor R3 is connected to the other end of the second resistor R2, and the other end of the third resistor R3 is grounded; one end of a fourth resistor R4 is respectively connected with the positive electrode end of the direct-current power supply and the source electrode of the third switching tube Q3, the collector electrode of the second triode V2 is connected with the other end of the fourth resistor R4 and is provided with a fourth node, the fourth node is used as a third signal output end of the control module 30, the emitter electrode of the second triode V2 is grounded, one end of a fifth resistor R5 is connected with the base electrode of the second triode V2, one end of a sixth resistor R6 is connected with the other end of the fifth resistor R5, and the other end of the sixth resistor R6 is grounded; a first control output pin, i.e., pin 2, of the controller IC2 is connected to one end of the third resistor R3 and the other end of the second resistor R2, respectively, a second control output pin, i.e., pin 3, of the controller IC2 is used as a second signal output end of the control module 30, a third control output pin, i.e., pin 7, of the controller IC 30 is connected to one end of the sixth resistor R6 and the other end of the fifth resistor R5, respectively, a fourth control output pin, i.e., pin 6, of the controller IC2 is used as a second signal output end of the control module 30, and a feedback pin, i.e., pin 5, of the controller IC2 is connected to the detection node.
That is, in the embodiment of the present invention, as shown in fig. 2, the external dc power supply has polarity, the positive terminal thereof is connected to the sources of Q1 and Q3, and the operation modes of the controller IC2 are the load identification mode and the output mode respectively after the turning on of Q1 and Q3. When the controller IC2 works in a load identification mode, pins 2 and 3 of the controller IC2 are used as one group, pins 7 and 6 of the controller IC2 are used as the other group, and the two groups of pins alternately output pulse levels to the four switching tubes Q1, Q2, Q3 and Q4, so that the first output end LEDA and the second output end LEDB alternately apply driving voltage signals to the accessed LED assemblies, and the working condition of the LED assemblies can be judged; when the controller IC2 operates in the output mode, pins 2 and 3 of the controller IC2 are used as one group, pins 7 and 6 of the controller IC2 are used as another group, and only one of the two groups outputs a high level, so that the output of the first output terminal LEDA or the second output terminal LEDB is locked.
Specifically, when the first output end LEDA is connected to the positive end LED + of the LED module and the second output end LEDB is connected to the negative end LED-of the LED module, the controller IC2 first enters a load recognition mode, at this time, the 2 pin and the 3 pin of the controller IC2 simultaneously output a short-term high level, the first triode V1 is turned on, the gate of the first switching tube Q1 is pulled down to the ground, the first switching tube Q1 is turned on, and the gate of the second switching tube Q2 applies a high level and is also turned on, and the polarity of the LED module is correct, an external dc power supply forms a loop to the ground through the Q1, the LED module, the Q2, the D2, and the RS, so that the LED module normally works and emits light, thereby generating a voltage drop on the RS, and the detection node feeds the voltage detection signal back to the controller IC2 for judgment, the controller IC2 judges that the polarity of the LED module is correct at this time, and enters an output mode, the high level state of the 2 pin and the 3 pin of the controller IC2 is always maintained (at this time, the 7 pin and 6 pin of the controller IC2 is a low pin, so as to continuously output a low level, and to ensure that the voltage is continuously output and drive voltage is output. Wherein, if the LED assembly is disconnected in the middle, the controller IC2 enters the load recognition mode again.
When the first output end LEDA is connected to the negative end LED of the LED module, and the second output end LEDB is connected to the positive end LED +, the controller IC2 first enters the load recognition mode, at this time, the 7 th pin and the 6 th pin of the controller IC2 output a short-duration high level at the same time, the second triode V2 is turned on, the gate of the third switching tube Q3 is pulled down to the ground, the third switching tube Q3 is turned on, and the gate of the fourth switching tube Q4 applies a high level and is also turned on, and the polarity of the LED module is correct, an external direct current power supply forms a loop through the Q3, the LED module, Q4, D1, and RS, so that the LED module normally works to emit light, thereby generating a voltage drop on the RS, and feeding the voltage detection signal back to the controller IC2 for judgment, the controller IC2 judges that the polarity of the LED module is correct at this time, and immediately enters the output mode, and the high level states of the 7 th pin and the 6 th pin of the controller IC2 (the 2 nd pin of the controller IC2 is a low level) are always kept, and output sustainable voltage is locked. Wherein, if the LED assembly is disconnected in the middle, the controller IC2 enters the load recognition mode again.
Therefore, in the embodiment of the present invention, the output level signals of the first control output pin and the second control output pin of the controller IC2 remain the same, and the output level signals of the third control output pin and the fourth control output pin of the controller IC2 remain the same.
The LED polarity identification circuit provided by the embodiment of the invention can accurately judge the polarity of the LED assembly within a rated load range, thereby better improving the load stability, more intelligently managing and controlling the use condition of the load and more promoting the unification of LED lamp interfaces on the market.
According to an embodiment of the present invention, as shown in fig. 2, the LED polarity identification circuit further includes a voltage stabilizing module 50, the voltage stabilizing module 50 is connected to the positive terminal of the dc power supply, and the voltage stabilizing module 50 is configured to perform voltage stabilizing processing on the output voltage of the dc power supply to output a stabilized voltage power supply, and provide the stabilized voltage power supply, such as 5V power supply, to the controller IC in the control module 30.
Specifically, as shown in fig. 2, the voltage stabilizing module 50 includes a first electrolytic capacitor E1, a voltage stabilizing chip IC1 and a second electrolytic capacitor E2, wherein a positive terminal of the first electrolytic capacitor E1 is connected to a positive terminal of the dc power supply, a negative terminal of the first electrolytic capacitor E1 is connected to ground, an input pin of the voltage stabilizing chip IC1 is connected to the positive terminal of the first electrolytic capacitor E1 and the positive terminal of the dc power supply, an output pin of the voltage stabilizing chip IC1 is connected to a power pin, i.e., pin 1, of the controller IC2, a positive terminal of the second electrolytic capacitor E2 is connected to an output pin of the voltage stabilizing chip IC1, and a negative terminal of the second electrolytic capacitor E2 is connected to ground.
That is, the other path of the positive terminal of the external dc power supply is regulated by E1, IC1, and E2, and then supplies power to IC2, so that the whole system loop starts to operate.
In summary, according to the LED polarity identification circuit provided by the embodiment of the present invention, by providing the H-bridge switch module and the load detection module, the control module controls the H-bridge switch module, so that the first output terminal and the second output terminal of the H-bridge switch module can alternately output the driving voltage signal to the LED component, and determine whether the LED component is currently operating according to the voltage detection signal, and identify that the LED component is currently in the correct polarity connection state when the LED component is currently operating, the polarity of the LED component connected to the LED component can be accurately identified, and the output of the first output terminal or the second output terminal is locked by controlling the H-bridge switch module, so that the LED component is ensured to stably operate in the correct polarity connection state, and thus the LED lamp does not need to be equipped with a specific interface and a polarity mark for distinguishing, the commonality of the LED lamp is greatly improved, the generation of electronic waste is reduced, and the resource waste is avoided.
In addition, as shown in fig. 3, an embodiment of the invention further provides an LED lamp 100, which includes the LED polarity identification circuit 200.
According to the LED lamp provided by the embodiment of the invention, the polarity of the LED component can be accurately identified through the LED polarity identification circuit, and the output of the first output end or the second output end is locked through controlling the H-bridge switch module, so that the LED component is ensured to stably work in a correct polarity connection state, a specific interface and a polarity mark are not required to be equipped for polarity distinguishing, the universality of the lamp is greatly improved, the generation of electronic waste is reduced, and the waste of resources is avoided.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (7)
1. An LED polarity identification circuit, comprising:
the H-bridge switch module is provided with a first output end and a second output end, and the first output end and the second output end are used for being connected with an LED assembly;
the load detection module is used for detecting whether the LED assembly works or not so as to generate a voltage detection signal;
the control module is respectively connected with the H-bridge switch module and the load detection module, and is used for controlling the H-bridge switch module so that the first output end and the second output end alternately output driving voltage signals to the LED assembly, judging whether the LED assembly works currently according to the voltage detection signals, identifying that the LED assembly is in a correct polarity connection state currently when the LED assembly works currently, and locking the output of the first output end or the second output end by controlling the H-bridge switch module;
wherein the H-bridge switch module comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first diode and a second diode, wherein,
the source electrode of the first switching tube is connected to the positive electrode end of the direct-current power supply, the grid electrode of the first switching tube is connected with the first signal output end of the control module, the drain electrode of the first switching tube is connected with the drain electrode of the fourth switching tube and is provided with a first node, and the first node is used as the first output end;
a source electrode of the second switching tube is connected with an anode electrode of the second diode, a grid electrode of the second switching tube is connected with a second signal output end of the control module, a drain electrode of the second switching tube is connected with a drain electrode of the third switching tube and is provided with a second node, and the second node is used as the second output end;
the source electrode of the third switching tube is connected with the source electrode of the first switching tube, and the grid electrode of the third switching tube is connected with the third signal output end of the control module;
a source electrode of the fourth switching tube is connected with an anode of the first diode, and a grid electrode of the fourth switching tube is connected with a fourth signal output end of the control module;
the cathode of the first diode is connected with the cathode of the second diode and then is respectively connected with the control module and the load detection module;
the first switch tube and the third switch tube respectively comprise a PMOS tube and a freewheeling diode, and the second switch tube and the fourth switch tube respectively comprise an NMOS tube and a freewheeling diode.
2. The LED polarity identification circuit of claim 1 wherein the load detection module comprises:
and one end of the detection resistor is respectively connected with the cathode of the first diode and the cathode of the second diode and is provided with a detection node, and the other end of the detection resistor is grounded.
3. The LED polarity identification circuit of claim 2 wherein the control module comprises:
one end of the first resistor is connected with the positive electrode end of the direct-current power supply and the source electrode of the first switching tube respectively;
a collector of the first triode is connected with the other end of the first resistor and is provided with a third node, the third node is used as a first signal output end of the control module, and an emitter of the first triode is grounded;
one end of the second resistor is connected with the base electrode of the first triode;
one end of the third resistor is connected with the other end of the second resistor, and the other end of the third resistor is grounded;
one end of the fourth resistor is connected with the positive end of the direct-current power supply and the source electrode of the third switching tube respectively;
a collector of the second triode is connected with the other end of the fourth resistor and is provided with a fourth node, the fourth node is used as a third signal output end of the control module, and an emitter of the second triode is grounded;
one end of the fifth resistor is connected with the base electrode of the second triode;
one end of the sixth resistor is connected with the other end of the fifth resistor, and the other end of the sixth resistor is grounded;
and a first control output pin of the controller is respectively connected with one end of the third resistor and the other end of the second resistor, a second control output pin of the controller is used as a second signal output end of the control module, a third control output pin of the controller is respectively connected with one end of the sixth resistor and the other end of the fifth resistor, a fourth control output pin of the controller is used as a second signal output end of the control module, and a feedback pin of the controller is connected with the detection node.
4. The LED polarity recognition circuit of claim 3, wherein the output level signals of the first control output pin and the second control output pin of the controller remain the same, and the output level signals of the third control output pin and the fourth control output pin of the controller remain the same.
5. The LED polarity identifying circuit according to any one of claims 1-4, further comprising a voltage stabilizing module, wherein the voltage stabilizing module is connected to the positive terminal of the DC power supply, and the voltage stabilizing module is configured to stabilize the output voltage of the DC power supply to output a stabilized voltage power and provide the stabilized voltage power to the controller in the control module.
6. The LED polarity identification circuit of claim 5 wherein the voltage regulation module comprises:
the positive end of the first electrolytic capacitor is connected with the positive end of the direct-current power supply, and the negative end of the first electrolytic capacitor is grounded;
the input pin of the voltage stabilizing chip is respectively connected with the positive terminal of the first electrolytic capacitor and the positive terminal of the direct current power supply, and the output pin of the voltage stabilizing chip is connected with the power supply pin of the controller;
and the positive end of the second electrolytic capacitor is connected with the output pin of the voltage stabilizing chip, and the negative end of the second electrolytic capacitor is grounded.
7. LED luminaire, characterized in that it comprises an LED polarity identification circuit according to any of claims 1-6.
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| CN201910471458.8A CN110267391B (en) | 2019-05-31 | 2019-05-31 | LED polarity identification circuit and LED lamp with same |
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| US6437519B1 (en) * | 1999-06-21 | 2002-08-20 | Koito Manufacturing Co., Ltd. | Discharge lamp lighting circuit |
| CN101696981A (en) * | 2009-10-29 | 2010-04-21 | 杭州电子科技大学 | Program-controlled converter for output polarity of detecting instrument |
| CN103107689A (en) * | 2011-11-11 | 2013-05-15 | 台达电子企业管理（上海）有限公司 | Cascading transducer and power unit and bypass module of power unit |
| CN109729620A (en) * | 2019-01-07 | 2019-05-07 | 李悦荣 | A kind of LED device of automatic identification output |
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2019
- 2019-05-31 CN CN201910471458.8A patent/CN110267391B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6437519B1 (en) * | 1999-06-21 | 2002-08-20 | Koito Manufacturing Co., Ltd. | Discharge lamp lighting circuit |
| CN101696981A (en) * | 2009-10-29 | 2010-04-21 | 杭州电子科技大学 | Program-controlled converter for output polarity of detecting instrument |
| CN103107689A (en) * | 2011-11-11 | 2013-05-15 | 台达电子企业管理（上海）有限公司 | Cascading transducer and power unit and bypass module of power unit |
| CN109729620A (en) * | 2019-01-07 | 2019-05-07 | 李悦荣 | A kind of LED device of automatic identification output |
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