CN107295721B - LED drive circuit and LED electric indicator lamp - Google Patents
LED drive circuit and LED electric indicator lamp Download PDFInfo
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- CN107295721B CN107295721B CN201710680285.1A CN201710680285A CN107295721B CN 107295721 B CN107295721 B CN 107295721B CN 201710680285 A CN201710680285 A CN 201710680285A CN 107295721 B CN107295721 B CN 107295721B
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
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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
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/375—Switched mode power supply [SMPS] using buck topology
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B45/54—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a series array of LEDs
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B45/52—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a parallel array of LEDs
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Abstract
The invention discloses an LED driving circuit and an LED electric indicator lamp, which comprise a power supply module and a circuit current equalizing module, wherein the circuit current equalizing module comprises N parallel LED branches with the same specification, each LED branch comprises an LED string, a triode, a base resistor and an emitter resistor, and N is an integer not less than 2, wherein: the first end of the LED string is connected with the output positive end of the power supply module, the second end of the LED string is connected with the first end of the base resistor on the branch where the second end of the LED string is located and the collector electrode of the triode, the second end of the base resistor is connected with the base electrode of the triode, the emitting electrode of the triode is connected with the first end of the emitting electrode resistor, the second end of the emitting electrode resistor is connected with the output negative end of the power supply module, and the first ends of the base resistors on the N LED branches are connected with each other. The invention prolongs the service life of the LED electric indicator lamp, reduces the failure rate of the LED electric indicator lamp and increases the reliability of the LED electric indicator lamp.
Description
Technical Field
The invention relates to the field of LED illumination, in particular to an LED driving circuit and an LED electric indicator lamp.
Background
With the development of lighting technology, LED electrical indicator lamps are increasingly used. The quality of the LED electric indicator lamp is improved compared with the electric indicator lamp using filament heat as a light source, but the LED driving circuit of the existing LED electric indicator lamp is inferior, resulting in significant degradation of the quality and life of the LED electric indicator lamp.
Specifically, the LED driving circuit includes a plurality of LED branches, each LED branch includes an LED string, and when the LED string in the LED branch is shorted or opened, the current flowing through the failed LED branch changes, thereby causing the current flowing through other non-failed LED branches to also change, and making the current flowing through each LED branch nonuniform. Aiming at the situation, the driving circuit in the prior art cannot perform balanced adjustment on the current flowing through each LED branch, so that the luminous quality and the service life of the LED electric indicator lamp are affected due to the fact that the current flowing through each LED branch is uneven, the failure rate of the LED electric indicator lamp is increased, and the safety guarantee coefficient and the reliability of the LED electric indicator lamp are reduced.
Therefore, how to provide a solution to the above technical problem is a problem that a person skilled in the art needs to solve at present.
Disclosure of Invention
The invention aims to provide an LED driving circuit and an LED electric indicator lamp, which are used for improving the luminous quality of the LED electric indicator lamp, prolonging the service life of the LED electric indicator lamp, reducing the failure rate of the LED electric indicator lamp and increasing the safety guarantee coefficient and the reliability of the LED electric indicator lamp.
In order to solve the technical problems, the invention provides an LED driving circuit which is applied to an LED electric indicator lamp and comprises a power supply module and a circuit current equalizing module, wherein the circuit current equalizing module comprises N LED branches which are connected in parallel and have the same specification, each LED branch comprises an LED string, a triode, a base resistor and an emitter resistor, and N is an integer not less than 2, wherein:
the first end of the LED string is connected with the output positive end of the power supply module, the second end of the LED string is connected with the first end of the base resistor on the branch where the second end of the LED string is located and the collector of the triode respectively, the second end of the base resistor is connected with the base of the triode, the emitter of the triode is connected with the first end of the emitter resistor, the second end of the emitter resistor is connected with the output negative end of the power supply module, and the first ends of the base resistors on the N LED branches are connected with each other.
Preferably, each LED branch further comprises a sub-diode, and the LED driving circuit further comprises a total diode, wherein:
the positive ends of the sub-diodes are respectively connected with the second ends of the LED strings on the branches where the sub-diodes are located and the collector electrodes of the triodes, the negative ends of the N sub-diodes on the LED branches are mutually connected, the common ends of the N sub-diodes are connected with the positive ends of the main diodes, and the negative ends of the main diodes are respectively connected with the first ends of the base resistors on the N LED branches.
Preferably, the power module includes a circuit protection module, a circuit step-down module and a rectifier bridge, the circuit protection module includes a first capacitor, a first resistor, a negative temperature coefficient NTC resistor, wherein:
the first end of the first capacitor is connected with the first end of the first resistor and the output positive end of the alternating current power supply respectively, the second end of the first capacitor is connected with the first end of the NTC resistor and the output negative end of the alternating current power supply respectively, the second end of the first resistor is connected with the input end of the circuit voltage reduction module, the output end of the circuit voltage reduction module is connected with the input positive end of the rectifier bridge, the second end of the NTC resistor is connected with the input negative end of the rectifier bridge, the output positive end of the rectifier bridge is used as the output positive end of the power supply module, and the output negative end of the rectifier bridge is used as the output negative end of the power supply module.
Preferably, the circuit step-down module includes a second resistor and a second capacitor, wherein:
the first end of the second resistor is connected with the first end of the second capacitor, the common end of the second resistor is used as the input end of the circuit voltage reduction module, the second end of the second resistor is connected with the second end of the second capacitor, and the common end of the second resistor is used as the output end of the circuit voltage reduction module.
Preferably, the power module further comprises a third capacitor, a third resistor and a fourth capacitor, wherein:
the first end of the third capacitor is respectively connected with the first end of the third resistor and the output positive end of the rectifier bridge, the second end of the third resistor is connected with the first end of the fourth capacitor, the common end of the third resistor is used as the output positive end of the power module, and the second end of the third capacitor is respectively connected with the second end of the fourth capacitor and the output negative end of the rectifier bridge, and the common end of the third capacitor is used as the output negative end of the power module.
Preferably, the circuit board where the LED driving circuit is located is specifically a double-layer board.
Preferably, the circuit board is specifically a double-layer board subjected to glue-beating treatment.
Preferably, the LED driving circuit further comprises a circuit current stabilizing module, the circuit current stabilizing module comprises a zener diode and a PTC resistor, wherein:
the positive terminal of the voltage stabilizing diode is connected with the output negative terminal of the power module, the negative terminal of the voltage stabilizing diode is respectively connected with the first terminal of the PTC resistor and the output positive terminal of the power module, and the second terminal of the PTC resistor is connected with the first terminal of the LED string.
In order to solve the technical problem, the invention also provides an LED electric indicator lamp, which comprises any one of the LED driving circuits.
Preferably, the LED electrical indicator light further comprises a heat sink.
The invention provides an LED driving circuit which is applied to an LED electric indicator lamp and comprises a power supply module and a circuit current sharing module, wherein the circuit current sharing module comprises N LED branches which are connected in parallel and have the same specification, each LED branch comprises an LED string, a triode, a base resistor and an emitter resistor, and N is an integer not smaller than 2, wherein the LED string is a single-phase LED with the base resistor and the emitter resistor, and the LED string is a single-phase LED with the base resistor: the first end of the LED string is connected with the output positive end of the power supply module, the second end of the LED string is connected with the first end of the base resistor on the branch where the second end of the LED string is located and the collector electrode of the triode, the second end of the base resistor is connected with the base electrode of the triode, the emitting electrode of the triode is connected with the first end of the emitting electrode resistor, the second end of the emitting electrode resistor is connected with the output negative end of the power supply module, and the first ends of the base resistors on the N LED branches are connected with each other.
Therefore, when the LED strings of the LED branches are in short circuit or open circuit, the base voltages of the triodes of the LED branches are the same, the emitter voltages of the triodes are the same, and the voltages between the base and the emitter of the triodes are the same, so that the collector currents flowing through the triodes are the same, the uniformity of the current flowing through each LED branch is realized, the luminous quality of the LED electric indicator is improved, the service life of the LED electric indicator is prolonged, the fault rate of the LED electric indicator is reduced, and the safety guarantee coefficient and the reliability of the LED electric indicator are increased.
The invention also provides an LED electric indicator lamp which has the same beneficial effects as the LED driving circuit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an LED driving circuit according to the present invention;
fig. 2 is a schematic diagram of another LED driving circuit according to the present invention.
Detailed Description
The core of the invention is to provide the LED driving circuit and the LED electric indicator lamp, so that the luminous quality of the LED electric indicator lamp is improved, the service life of the LED electric indicator lamp is prolonged, the failure rate of the LED electric indicator lamp is reduced, and the safety guarantee coefficient and the reliability of the LED electric indicator lamp are increased.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an LED driving circuit according to the present invention.
The LED driving circuit is applied to an LED electric indicator lamp and comprises a power supply module 1 and a circuit current equalizing module 2, wherein the circuit current equalizing module 2 comprises N parallel LED branches with the same specification, each LED branch comprises an LED string D, a triode Q, a base resistor R1 and an emitter resistor R2, and N is an integer not smaller than 2, wherein:
the first end of LED cluster D links to each other with power module 1's output positive terminal, and LED cluster D's second end links to each other with the first end of base resistance R1 and triode Q's collecting electrode on its place branch respectively, and base resistance R1's second end links to each other with triode Q's base, and triode Q's projecting pole links to each other with projecting pole resistance R2's first end, and projecting pole resistance R2's second end links to each other with power module 1's output negative terminal, and the first end interconnect of base resistance R1 on the N LED branches.
Specifically, the LED driving circuit comprises a power supply module 1 and a circuit current equalizing module 2, and the LED driving circuit supplies power to the circuit current equalizing module 2 through the power supply module 1. The circuit current equalizing module 2 includes a plurality of parallel LED branches, and in consideration of ensuring uniformity of current flowing through each LED branch, specifications of each LED branch in the circuit current equalizing module 2 should be the same.
Specifically, the LED electrical indicator comprises N LED branches, each of which includes an LED string D, a triode Q, a base resistor R1, and an emitter resistor R2. The base resistor R1 is used as a bias resistor of the triode Q, so that the triode Q works in an amplifying state, and meanwhile, the base resistor R1 is also used as a base current limiting resistor, so that the base current can be prevented from being too large, and the triode Q is protected from being burnt. The emitter resistor R2 serves as a voltage detection resistor, and when the LED string D is shorted or opened, the current flowing through the emitter resistor R2 changes, and the voltage across the emitter resistor R2 changes, thereby changing the voltage of the emitter.
When the LED string D on the LED branch is short-circuited or broken, the circuit equalizing module 2 is configured to equalize and adjust the current flowing through each LED branch. Specifically, when the LED string D on a part of the LED branches is shorted, the voltage drop of the LED string D on the failed LED branch is reduced, resulting in an increase in the base voltage of the transistor Q on the failed LED branch, and since the bases of the transistors Q on the LED branches are connected together by the base resistor R1, the base voltage of the transistor Q on the other non-failed LED branches is also increased, and since the emitters are connected together by the emitter resistor R2, the base current flowing through the transistor Q on the LED branches is changed, thereby resulting in a change in the collector current flowing through the transistor Q on the LED branches. Since the base voltages of the triodes Q are the same, and the emitter voltages of the triodes Q are the same, the voltages between the bases and the emitters of the triodes Q are the same, that is, the parameters of the triodes Q are matched with each other, so that the collector currents of the triodes Q which are changed are balanced and adjusted to the same collector currents flowing through the triodes Q, that is, the currents flowing through the LED branches are uniform. When the LED strings D on all LED branches are shorted, the LED electrical indicator is not operated and the current flowing through each LED branch increases.
When the LED string D on the LED branch is partially broken, the current flowing through the other non-faulty LED branches increases, and because the collector of the transistor Q on the faulty LED branch is broken, the transistor Q is equivalent to a common diode, and because the parameters of the transistor Q on the non-faulty LED branch are matched with each other based on the above principle, the increased current on the non-faulty LED branch is evenly distributed, that is, the current flowing through each non-faulty LED branch is even. When the LED strings D on all the LED branches are broken, the LED electric indicator lamp does not work, and all the triodes do not work.
Therefore, when the LED string D of each LED branch is short-circuited or broken, the parameters of the triode Q of each LED branch are matched, so that the uniformity of the current flowing through each LED branch is realized. In addition, as long as not all LED strings D have faults, the non-fault LED strings D of the LED electric indicator light still work with the same brightness, only the brightness is changed, and the probability of occurrence of the two conditions is very low through the actual use condition, so that the safety guarantee coefficient of the LED electric indicator light is enhanced.
The invention provides an LED driving circuit which is applied to an LED electric indicator lamp and comprises a power supply module and a circuit current sharing module, wherein the circuit current sharing module comprises N LED branches which are connected in parallel and have the same specification, each LED branch comprises an LED string, a triode, a base resistor and an emitter resistor, and N is an integer not smaller than 2, wherein the LED string is a single-phase LED with the base resistor and the emitter resistor, and the LED string is a single-phase LED with the base resistor: the first end of the LED string is connected with the output positive end of the power supply module, the second end of the LED string is connected with the first end of the base resistor on the branch where the second end of the LED string is located and the collector electrode of the triode, the second end of the base resistor is connected with the base electrode of the triode, the emitting electrode of the triode is connected with the first end of the emitting electrode resistor, the second end of the emitting electrode resistor is connected with the output negative end of the power supply module, and the first ends of the base resistors on the N LED branches are connected with each other.
Therefore, when the LED strings of the LED branches are in short circuit or open circuit, the base voltages of the triodes of the LED branches are the same, the emitter voltages of the triodes are the same, and the voltages between the base and the emitter of the triodes are the same, so that the collector currents flowing through the triodes are the same, the uniformity of the current flowing through each LED branch is realized, the luminous quality of the LED electric indicator is improved, the service life of the LED electric indicator is prolonged, the fault rate of the LED electric indicator is reduced, and the safety guarantee coefficient and the reliability of the LED electric indicator are increased.
Based on the above embodiments:
referring to fig. 2, fig. 2 is a schematic diagram of another LED driving circuit according to the present invention.
As a preferred embodiment, each LED branch further comprises a sub-diode D1, and the LED driving circuit further comprises a total diode D2, wherein:
the positive terminal of the sub-diode D1 is respectively connected with the second terminal of the LED string D on the branch where the sub-diode D1 is positioned and the collector of the triode Q, the negative terminals of the sub-diodes D1 on the N LED branches are mutually connected, the common terminal of the sub-diodes D1 is connected with the positive terminal of the main diode D2, and the negative terminal of the main diode D2 is respectively connected with the first terminal of the base resistor R1 on the N LED branches.
Specifically, a sub-diode D1 is added between the LED string D and the base resistor R1 on each LED branch, and all the sub-diodes D1 and all the base resistors R1 are connected by a total diode D2. When the LED string D on the LED branch is shorted, the current flowing into each LED branch increases, during which a portion of the increased current is shunted to the sub-diode D1, and then to the base of the transistor Q on each LED branch via the total diode D2.
The volt-ampere characteristic of a diode is that the current and the voltage are exponentially related, and when the voltage is slightly changed, the current is exponentially changed. Therefore, when the LED string D on the LED branch is shorted, the voltage of the LED string D changes, that is, the voltage of the sub-diode D1 of the branch where the LED string D is located changes, and the current of the sub-diode D1 changes exponentially. The sub-diode D1 and the total diode D2 at this time correspond to a variable resistor, and when the current flowing through the sub-diode D1 and the total diode D2 increases, the resistance thereof increases, so that the current decreases. Thus, the presence of the sub-diode D1 and the total diode D2 prevents the increased current from falling entirely onto the transistor Q of each LED branch, thus protecting the transistor Q from burning out.
As a preferred embodiment, the power module 1 includes a circuit protection module, a circuit step-down module, and a rectifier bridge, the circuit protection module includes a first capacitor, a first resistor, an NTC (Negative Temperature Coefficient ) resistor, wherein:
the first end of the first capacitor is connected with the first end of the first resistor and the output positive end of the alternating current power supply respectively, the second end of the first capacitor is connected with the first end of the NTC resistor and the output negative end of the alternating current power supply respectively, the second end of the first resistor is connected with the input end of the circuit voltage reduction module, the output end of the circuit voltage reduction module is connected with the input positive end of the rectifier bridge, the second end of the NTC resistor is connected with the input negative end of the rectifier bridge, the output positive end of the rectifier bridge is used as the output positive end of the power supply module 1, and the output negative end of the rectifier bridge is used as the output negative end of the power supply module 1.
Specifically, the power module 1 includes a circuit protection module, a circuit step-down module, and a rectifier bridge, where the circuit step-down module is used to reduce the voltage of the ac power supply, and the rectifier bridge is used to convert the ac power of the ac power supply with reduced voltage into dc power. The application adopts the rectifier bridge to rectify, compares in discrete component, can reduce the fault point effectively.
The circuit protection module comprises a first capacitor, a first resistor and an NTC resistor, particularly, the first capacitor is adopted to filter at the input end of the alternating current power supply in consideration of the fact that a plurality of noises exist in an industrial power environment, so that the stability of the alternating current power supply is ensured, and the first capacitor can also inhibit the generation of common mode interference. The first resistor is used as a protection resistor of the input end of the alternating current power supply to prevent the element from being burnt when the voltage is too high. The NTC resistor is used as an absorbing surge element, when the alternating current power supply is switched on, the initial resistance value of the NTC resistor is large and is equivalent to open circuit, and the excessive current at the moment when the alternating current power supply is switched on is restrained, so that the LED driving circuit is protected; in the process that the LED driving circuit gradually enters a normal working state, along with the increase of the current flowing through the NTC resistor, the temperature of the NTC resistor gradually rises, so that the resistance value of the NTC resistor gradually decreases, and the normal work of the LED driving circuit is not influenced by the NTC resistor.
As a preferred embodiment, the circuit buck module comprises a second resistor and a second capacitor, wherein:
the first end of the second resistor is connected with the first end of the second capacitor, the common end of the second resistor is used as the input end of the circuit voltage reduction module, the second end of the second resistor is connected with the second end of the second capacitor, and the common end of the second resistor is used as the output end of the circuit voltage reduction module.
Specifically, the circuit voltage reduction module comprises a second resistor and a second capacitor connected in parallel with the second resistor, and the voltage reduction efficiency is high by adopting the second capacitor to reduce the voltage. When the LED driving circuit is powered off, the second resistor and the second capacitor connected with the second resistor in parallel form a loop, and the electric quantity stored in the second capacitor can be released through the second resistor to prevent other elements from being burnt out by the excessive voltage.
Of course, other depressurization modes can be selected in the application, and the invention is not limited in particular herein, and is determined according to practical situations.
As a preferred embodiment, the power module 1 further comprises a third capacitor, a third resistor and a fourth capacitor, wherein:
the first end of the third capacitor is connected with the first end of the third resistor and the output positive end of the rectifier bridge respectively, the second end of the third resistor is connected with the first end of the fourth capacitor, the common end of the third resistor is used as the output positive end of the power module 1, the second end of the third capacitor is connected with the second end of the fourth capacitor and the output negative end of the rectifier bridge respectively, and the common end of the third capacitor is used as the output negative end of the power module 1.
Specifically, the third resistor is used for current limiting protection, the third capacitor is used as a low-frequency rectifying filter capacitor and used for filtering the output signal of the rectifying bridge, and the fourth capacitor is used as a high-frequency filter capacitor, so that the output signal of the power module 1 is more stable.
As a preferred embodiment, the circuit board on which the LED driving circuit is located is specifically a double-layer board.
Specifically, the circuit board where the LED driving circuit is located adopts a double-layer board, on one hand, the double-layer board can be provided with electronic elements on both sides, so that the occupied space is reduced, and the national limit standard for the size of the LED electric indicator lamp is met; on the other hand, when the LED string D on the LED branch is short-circuited, the collector current of the triode Q of the failed LED branch is relatively large, and the double-layer plate is helpful for heat dissipation of the LED driving circuit, so that the triode Q of the failed LED branch is prevented from being burnt out.
As a preferred embodiment, the circuit board is embodied as a double-layer board subjected to a glue-applying treatment.
Specifically, the circuit board is glued, so that the dustproof, dampproof and electric shock preventing capabilities are enhanced, and the circuit board is suitable for complex industrial environments.
As a preferred embodiment, the LED driving circuit further comprises a circuit current stabilizing module comprising a zener diode and a PTC (Positive Temperature Coefficient ) resistor, wherein:
the positive end of the voltage stabilizing diode is connected with the output negative end of the power module 1, the negative end of the voltage stabilizing diode is respectively connected with the first end of the PTC resistor and the output positive end of the power module 1, and the second end of the PTC resistor is connected with the first end of the LED string D.
The zener diode and the PTC resistor provide a stable current for the circuit equalization module 2, specifically, the zener diode provides a stable voltage for the circuit equalization module 2, the PTC resistor is used as a current adjustment element, when the current flowing through the PTC resistor increases, the temperature of the PTC resistor increases, thereby increasing the resistance value of the PTC resistor and reducing the current, otherwise, when the current flowing through the PTC resistor decreases, the temperature of the PTC resistor decreases, thereby reducing the resistance value of the PTC resistor and increasing the current.
The invention also provides an LED electric indicator lamp, which comprises any one of the LED driving circuits.
For the description of the LED driving circuit in the LED electrical indicator provided by the present invention, reference is made to the above embodiment of the LED driving circuit, and the description of the present invention is omitted herein.
The LED electric indicator lamp also comprises a lamp cap and a lamp post, specifically, a circuit board where the LED driving circuit is arranged in from the direction of the lamp cap, the lamp post is provided with four clamping grooves, and the four clamping grooves are used for fixing the circuit board, so that the LED electric indicator lamp is simple and practical to install. Two wiring posts of the LED electric indicator lamp are provided with wire passing holes, and when the circuit board is installed, two main power wires penetrate through the wire passing holes and are welded to the wiring posts, and then the power wires of the LED discs are welded.
As a preferred embodiment, the LED electrical indicator light further comprises a heat sink.
In order to further diffuse heat generated by the LED electric indicator lamp during operation, a radiator is arranged on the LED electric indicator lamp.
It should be noted that in this specification 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The utility model provides a LED drive circuit, is applied to LED electric indicator lamp, its characterized in that includes power module and circuit module that flow equalizes, the circuit flow equalizing module includes N parallelly connected, the same LED branch road of specification, every LED branch road all includes LED cluster, triode, base resistance and projecting pole resistance, and N is not less than 2 integers, wherein:
the first end of the LED string is connected with the positive output end of the power supply module, the second end of the LED string is respectively connected with the first end of the base resistor on the branch where the second end of the LED string is positioned and the collector electrode of the triode, the second end of the base resistor is connected with the base electrode of the triode, the emitter electrode of the triode is connected with the first end of the emitter resistor, the second end of the emitter resistor is connected with the negative output end of the power supply module, and the first ends of the base resistors on the N LED branches are mutually connected;
each LED branch circuit further comprises a sub-diode, and the LED driving circuit further comprises a total diode, wherein:
the positive ends of the sub-diodes are respectively connected with the second ends of the LED strings on the branches where the sub-diodes are positioned and the collector electrodes of the triodes, the negative ends of the N sub-diodes on the LED branches are mutually connected, the common ends of the N sub-diodes are connected with the positive ends of the total diodes, and the negative ends of the total diodes are respectively connected with the first ends of the base resistors on the N LED branches;
the power module comprises a circuit protection module, a circuit voltage reduction module and a rectifier bridge, wherein the circuit protection module comprises a first capacitor, a first resistor and a negative temperature coefficient NTC resistor, and the circuit protection module comprises:
the first end of the first capacitor is respectively connected with the first end of the first resistor and the output positive end of the alternating current power supply, the second end of the first capacitor is respectively connected with the first end of the NTC resistor and the output negative end of the alternating current power supply, the second end of the first resistor is connected with the input end of the circuit voltage reduction module, the output end of the circuit voltage reduction module is connected with the input positive end of the rectifier bridge, the second end of the NTC resistor is connected with the input negative end of the rectifier bridge, the output positive end of the rectifier bridge is used as the output positive end of the power supply module, and the output negative end of the rectifier bridge is used as the output negative end of the power supply module;
the circuit step-down module comprises a second resistor and a second capacitor, wherein:
the first end of the second resistor is connected with the first end of the second capacitor, the common end of the second resistor is used as the input end of the circuit voltage reduction module, the second end of the second resistor is connected with the second end of the second capacitor, and the common end of the second resistor is used as the output end of the circuit voltage reduction module;
the power module further comprises a third capacitor, a third resistor and a fourth capacitor, wherein:
the first end of the third capacitor is respectively connected with the first end of the third resistor and the output positive end of the rectifier bridge, the second end of the third resistor is connected with the first end of the fourth capacitor, the common end of the third resistor is used as the output positive end of the power module, and the second end of the third capacitor is respectively connected with the second end of the fourth capacitor and the output negative end of the rectifier bridge, and the common end of the third capacitor is used as the output negative end of the power module.
2. The LED driving circuit of claim 1, wherein the circuit board on which the LED driving circuit is located is a two-layer board.
3. The LED driving circuit of claim 2, wherein the circuit board is embodied as a double-layer board subjected to a paste-applying process.
4. A LED driving circuit according to any of claims 1-3, further comprising a circuit current stabilizing module comprising a zener diode and a positive temperature coefficient PTC resistor, wherein:
the positive terminal of the voltage stabilizing diode is connected with the output negative terminal of the power module, the negative terminal of the voltage stabilizing diode is respectively connected with the first terminal of the PTC resistor and the output positive terminal of the power module, and the second terminal of the PTC resistor is connected with the first terminal of the LED string.
5. An LED electrical indicator lamp comprising an LED driving circuit according to any one of claims 1-4.
6. The LED electrical indicator light of claim 5, further comprising a heat sink.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710680285.1A CN107295721B (en) | 2017-08-10 | 2017-08-10 | LED drive circuit and LED electric indicator lamp |
| PCT/CN2017/114957 WO2019029068A1 (en) | 2017-08-10 | 2017-12-07 | Led driving circuit and led electrical indicator light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710680285.1A CN107295721B (en) | 2017-08-10 | 2017-08-10 | LED drive circuit and LED electric indicator lamp |
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| CN107295721A CN107295721A (en) | 2017-10-24 |
| CN107295721B true CN107295721B (en) | 2023-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710680285.1A Active CN107295721B (en) | 2017-08-10 | 2017-08-10 | LED drive circuit and LED electric indicator lamp |
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| Country | Link |
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| CN (1) | CN107295721B (en) |
| WO (1) | WO2019029068A1 (en) |
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| CN107295721B (en) * | 2017-08-10 | 2023-05-09 | 广东工业大学 | LED drive circuit and LED electric indicator lamp |
| CN108738202B (en) * | 2018-07-12 | 2024-02-09 | 江苏鼎云信息科技有限公司 | Equal-voltage uniform circuit or non-uniform circuit, device and manufacturing method thereof |
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| US5949273A (en) * | 1996-07-12 | 1999-09-07 | Semikron Elektronik Gmbh | Short circuit protection for parallel connected devices |
| CN101778510A (en) * | 2010-01-18 | 2010-07-14 | 海洋王照明科技股份有限公司 | LED signal indicator light and multipath LED drive circuits thereof |
| CN203151801U (en) * | 2013-01-05 | 2013-08-21 | 重庆市贝仓光电科技有限公司 | Led point light source circuit |
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| CN201611970U (en) * | 2010-02-04 | 2010-10-20 | 深圳市麦格米特电气技术有限公司 | Novel multiple-way LED constant current drive circuit |
| CN107295721B (en) * | 2017-08-10 | 2023-05-09 | 广东工业大学 | LED drive circuit and LED electric indicator lamp |
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2017
- 2017-08-10 CN CN201710680285.1A patent/CN107295721B/en active Active
- 2017-12-07 WO PCT/CN2017/114957 patent/WO2019029068A1/en active Application Filing
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| US5949273A (en) * | 1996-07-12 | 1999-09-07 | Semikron Elektronik Gmbh | Short circuit protection for parallel connected devices |
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| CN103582225A (en) * | 2012-08-08 | 2014-02-12 | 江苏格曼迪光电科技有限公司 | Touch control type light-adjusting driving power supply and LED lamp thereof |
| CN203151801U (en) * | 2013-01-05 | 2013-08-21 | 重庆市贝仓光电科技有限公司 | Led point light source circuit |
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| Publication number | Publication date |
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| CN107295721A (en) | 2017-10-24 |
| WO2019029068A1 (en) | 2019-02-14 |
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