CN107438302B - LED short-circuit protection system - Google Patents
LED short-circuit protection system Download PDFInfo
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- CN107438302B CN107438302B CN201610357639.4A CN201610357639A CN107438302B CN 107438302 B CN107438302 B CN 107438302B CN 201610357639 A CN201610357639 A CN 201610357639A CN 107438302 B CN107438302 B CN 107438302B
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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]
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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 provides an LED short-circuit protection system, which comprises a power module, an execution protection unit, a signal acquisition unit and a signal processing unit, wherein the power module is used for supplying power to a load LED light source and a circuit, the execution protection unit is used for performing power-off protection on the system when the load LED light source has a short-circuit fault, the signal acquisition unit is used for acquiring a short-circuit signal in real time to detect the system, and the signal processing unit is used for judging the short-circuit fault according to the acquisition signal of the signal acquisition unit and controlling the execution protection unit to perform short-circuit; the invention can solve the problem that short circuit can not be protected in a power output LED system, can lock a power supply or a control circuit under the condition that the output LED has short circuit, realizes the short circuit protection of the power output multi-path LED system, simultaneously avoids the short circuit instant, outputs large current, and breaks down circuit components by instant current, thereby protecting loads such as the LED and the like, and also preventing the power supply and subsequent circuit parts from being damaged.
Description
Technical Field
The invention relates to the field of electronics, in particular to an LED short-circuit protection system.
Background
An LED (light emitting diode) is called a fourth-generation light source, has the characteristics of energy saving, environmental protection, safety, long service life, low power consumption, low heat, high brightness, water resistance, micro-size, shock resistance, easiness in dimming, light beam concentration, simplicity and convenience in maintenance and the like, can be widely applied to the fields of various indications, display, decoration, backlight sources, general illumination and the like, and is widely used as an illumination light source.
In the prior art, corresponding research is also performed in China for LED short-circuit protection to reduce the hardness caused by such failures, for example: the chinese patent application with publication number 103001179a discloses an LED lamp and a short-circuit protection circuit thereof, and the main technical scheme is to cut off a power supply loop of a subsequent LED constant current circuit through a relay when the LED lamp is short-circuited, so as to perform the short-circuit protection function. For another example: the chinese patent application with publication number 101959352a discloses an LED driving circuit with LED short-circuit protection, and the main technical scheme includes an LED short-circuit protection circuit module and an N-MOS transistor connected in series between the LED and ground GND for switching, and when the LED is short-circuited, the N-MOS transistor is driven to turn off, thereby playing a role of short-circuit protection.
Disclosure of Invention
In view of this, the present invention provides an LED short-circuit protection system, which can protect loads such as LEDs when the LEDs are short-circuited, and prevent the power supply and the subsequent circuit part from being damaged.
The invention provides an LED short-circuit protection system, which comprises
A power supply module for supplying power to the load LED light source and the circuit,
the execution protection unit is used for performing power-off protection on the system when the load LED light source has short-circuit fault,
the signal acquisition unit is used for acquiring short-circuit signals in real time to detect the system,
the signal processing unit is used for judging short-circuit faults according to the collected signals of the signal collecting unit and controlling the execution protection unit to carry out short-circuit protection;
the power module is connected with the execution protection unit, the execution protection unit is connected with the signal acquisition unit, the output end of the signal acquisition unit is connected with the input end of the signal processing unit, and the output end of the signal processing unit is connected with the input end of the execution protection unit;
when the load LED light source has short-circuit fault, the signal acquisition unit transmits the acquired short-circuit signal to the signal processing unit, and the signal processing unit judges according to the short-circuit signal and controls the execution protection unit to work to carry out short-circuit protection after judging that the fault occurs.
Further, the execution protection unit comprises a short-circuit protection module, and the short-circuit protection module comprises a first locking circuit arranged at the output end of the power supply module and used for cutting off the output end and/or a second locking circuit arranged at the input end of the power supply module and used for controlling the power supply module to stop working.
Further, the short-circuit protection module further comprises a controller protection circuit, wherein the controller protection circuit is arranged between the load LED light source and the signal processing unit and used for disconnecting the load LED light source from the signal processing unit when the short-circuit fault of the system is detected.
Furthermore, the execution protection unit further comprises a buffer protection module for reducing instant current impact when short-circuit fault occurs, the input end of the buffer protection module is connected with the output end of the power module, and the output end of the buffer protection module is connected with the input end of the load LED light source.
Further, the signal processing unit comprises a threshold circuit and/or a control chip for analyzing and processing the short circuit signal and controlling the load LED light source; the threshold circuit judges the short circuit by comparing the signal acquired by the signal acquisition unit with a threshold trigger threshold; and the control chip compares the signal acquired by the signal acquisition unit with a preset threshold range to judge the short circuit.
Further, the load LED light source is a plurality of paths of LED light sources, the controller protection circuit comprises a plurality of switch devices or switch circuits, each path of LED light source is connected with one-to-one corresponding switch device or switch circuit, and when the system has a short-circuit fault, the controller protection circuit is disconnected to perform short-circuit protection on the load LED light source.
The invention has the beneficial effects that: the LED short-circuit protection system can solve the problem that short circuits cannot be protected in a power output LED system, can lock a power supply or a control circuit under the condition that the output LED is short-circuited, realizes short-circuit protection of the power output multi-path LED system, simultaneously avoids the short circuit instant, outputs large current, and breaks down circuit components by instant current, thereby protecting loads such as the LED and the like, and preventing the power supply and subsequent circuit parts from being damaged.
Drawings
The invention is further described below with reference to the following figures and examples:
fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a circuit schematic of a first embodiment of the invention.
Fig. 3 is a schematic structural diagram of a second embodiment of the present invention.
Fig. 4 is a circuit schematic of a second embodiment of the invention.
Fig. 5 is a schematic structural diagram of a third embodiment of the present invention.
Fig. 6 is a circuit schematic of a third embodiment of the present invention.
Fig. 7 is a circuit schematic of a fourth embodiment of the invention.
Detailed Description
The invention is further described below with reference to the following figures and examples: fig. 1 is a schematic structural diagram of a first embodiment of the present invention, fig. 2 is a schematic circuit diagram of the first embodiment of the present invention, fig. 3 is a schematic structural diagram of a second embodiment of the present invention, fig. 4 is a schematic circuit diagram of the second embodiment of the present invention, fig. 5 is a schematic structural diagram of a third embodiment of the present invention, fig. 6 is a schematic circuit diagram of the third embodiment of the present invention, and fig. 7 is a schematic circuit diagram of a fourth embodiment of the present invention.
As shown in FIG. 1, the short-circuit protection system for LED in this embodiment comprises
A power supply module for supplying power to the load LED light source and the circuit,
the execution protection unit is used for performing power-off protection on the system when the load LED light source has short-circuit fault,
the signal acquisition unit is used for acquiring short-circuit signals in real time to detect the system,
the signal processing unit is used for judging short-circuit faults according to the collected signals of the signal collecting unit and controlling the execution protection unit to carry out short-circuit protection;
the power module is connected with the execution protection unit, the execution protection unit is connected with the signal acquisition unit, the output end of the signal acquisition unit is connected with the input end of the signal processing unit, and the output end of the signal processing unit is connected with the input end of the execution protection unit;
when the load LED light source has short-circuit fault, the signal acquisition unit transmits the acquired short-circuit signal to the signal processing unit, and the signal processing unit judges according to the short-circuit signal and controls the execution protection unit to work to carry out short-circuit protection after judging that the fault occurs.
In this embodiment, the power module can supply power to the subsequent circuit part and drive the subsequent circuit, the execution protection unit can protect the load LED and the preceding stage part when short circuit occurs, the signal acquisition unit can monitor the whole system in real time, and sends a monitoring signal to the signal processing unit, and the signal processing unit judges the short circuit signal of the system according to the monitoring signal and controls the execution protection unit to perform short circuit protection.
The present invention will be described in more detail with reference to the following examples:
first embodiment
As shown in fig. 1 and 2, in this embodiment, when the load LED light source is short-circuited, a large instantaneous current is output at the short-circuited moment, in order to prevent the load and the power module from being damaged, the first locking circuit is arranged between the output end of the power supply module and the load LED light source, so that the impedance of the load can be increased, the impact of instant current generated at the moment of short circuit is reduced, the voltage and the current are synchronously and slowly reduced, the collected short circuit signal is transmitted to the signal processing unit through the signal collecting unit, the signal processing unit judges the short circuit signal according to the received signal, the signal processing unit sends a control command after the system is judged to have short circuit fault, all the outputs of the power supply module are locked by the first locking circuit, the load stops working, the power supply module is disconnected from the load, and short-circuit protection of the load, the power supply and other circuits is achieved. According to the embodiment, after the short-circuit fault of the load LED light source is removed, the lighting system can be restarted, the lighting system can work normally, and the purpose of long-time protection is further achieved. The signal processing unit in this embodiment may adopt a threshold circuit, and utilize a threshold triggering principle through a load parameter fed back to the signal acquisition unit, and determine that a short-circuit fault occurs if the load parameter reaches a threshold parameter triggered by a threshold, and execute short-circuit protection at the same time.
Second embodiment
As shown in fig. 3 and 4, the difference between this embodiment and the first embodiment is that the execution protection unit further includes a second locking circuit, which is disposed at the input end of the power module and is used for controlling the power module to stop working.
Third embodiment
As shown in fig. 5 and 6, the difference between this embodiment and the above two embodiments is that this embodiment is suitable for being applied in an LED light source lighting system with output control function, and can perform short-circuit protection on the LED light source lighting system, in this embodiment, an execution protection circuit can respectively perform corresponding short-circuit protection on the input terminal of the power supply module, the output terminal of the power supply module, and the control input terminal of the LED light source under the control of the signal processing unit according to the actual system, and through a controller protection circuit in the short-circuit protection module, the connection between the load LED light source and the signal processing unit is disconnected when the system short-circuit fault is detected, the controller protection circuit is disposed between the load LED light source and the signal processing unit, wherein the output load of the LED light source has control functions of adjusting brightness, color temperature, and the like, as shown in fig. 6, the output terminal of the first locking circuit is connected with the first load, the other end of the first load LED light source L1 is connected to one end of a second switch device Q2, the other end of the second switch device Q2 is connected to a control pin PWM1 of the signal processing unit, PWM1, PWM2 and PWM3 respectively represent control pins of the lighting driving signal of the signal processing unit, and the third switch device Q3, the fourth switch device Q4 and the nth switch device are connected in parallel. In fig. 5, the signal processing unit adopts a control chip U1 with functions of analyzing and processing short-circuit signals and controlling the LED light source, and compares the signals acquired by the signal acquisition unit with a threshold, and when the comparison result reaches a certain threshold error range, it is determined as a short-circuit signal, and short-circuit protection processing is performed on the system; and other goodness of fit comparisons can be carried out on the signals acquired by the signal acquisition unit to judge the short circuit fault of the system.
In this embodiment, the execution protection unit further includes a buffer protection module for reducing instantaneous current surge when a short-circuit fault occurs, an input end of the buffer protection module is connected to an output end of the power module, and an output end of the buffer protection module is connected to an input end of the load LED light source. When the load LED light source is short-circuited, the output instantaneous current is large at the short-circuited moment, in order to prevent the power supply and peripheral circuits in the load and the lighting driving module from being damaged, the buffer protection module is additionally arranged between the output end of the power supply and the load LED light source, the impedance of the load is increased, the impact of the instantaneous current is relieved at the short-circuited moment, the voltage and the current synchronously and slowly drop, and the purpose of protecting the load, the power supply and other circuits is further achieved.
Fourth embodiment
As shown in fig. 7, the difference between this embodiment and the third embodiment is that the signal processing unit receives the short-circuit signal of the signal acquisition circuit, determines the short-circuit signal, and then sends out a control command, and the first locking circuit locks the power module to stop the power module and the load, or stops the output of the PWM control pin to stop the control of each path of LED light source.
In this embodiment, the load LED light source is a multi-path LED light source, the controller protection circuit includes a plurality of switching devices or switching circuits, each path of LED light source is connected to a corresponding switching device or switching circuit, when a short-circuit fault occurs in the system, the controller protection circuit is turned off to perform short-circuit protection on the load LED light source, as shown in fig. 7, the output circuits of the load LED light sources are PWM1 to PWMn, where n represents the number of parallel LED light sources, and similarly, the number of switching devices between the load LED light source and the signal processing control unit is also n, the number of n is greater than or equal to 1, the number of LEDs in the output circuit PWMn of a single LED light source is m, the number of m is greater than or equal to 1, one end of the LED light source is connected to VCC, and the other end of the LED light source is connected to PWM1 to PWMn of the signal processing control unit through the. The embodiment is not only suitable for a multi-path LED output short-circuit protection system, but also suitable for various single-path and combined LED short-circuit protection systems, and can normally work under the condition of restarting after short circuit recovery, thereby achieving the purpose of long-time protection.
In this embodiment, a short-circuit notification unit may be further correspondingly disposed, and when a short-circuit fault occurs to the load LED light source, the short-circuit notification unit is controlled by the signal processing unit to perform short-circuit notification, where the notification mode may be an audible and visual alarm or a wireless transmission mode to send a notification signal, and the short-circuit notification unit may be an independent power supply mode to avoid being affected by the system.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (2)
1. An LED short-circuit protection system characterized in that: comprises that
A power supply module for supplying power to the load LED light source and the circuit,
the execution protection unit is used for carrying out short-circuit protection on the system when the load LED light source has short-circuit fault,
a signal acquisition unit for detecting the system by acquiring the short circuit signal in real time,
the signal processing unit is used for judging short-circuit faults according to the collected signals of the signal collecting unit and controlling the execution protection unit to carry out short-circuit protection;
the power module is connected with the execution protection unit, the execution protection unit is connected with the signal acquisition unit, the output end of the signal acquisition unit is connected with the input end of the signal processing unit, and the output end of the signal processing unit is connected with the input end of the execution protection unit;
when the load LED light source has short-circuit fault, the signal acquisition unit transmits the acquired short-circuit signal to the signal processing unit, and the signal processing unit judges according to the short-circuit signal and controls the execution protection unit to work to carry out short-circuit protection after judging that the short-circuit fault occurs;
the execution protection unit comprises a short-circuit protection module, and the short-circuit protection module comprises a first locking circuit which is arranged at the output end of the power supply module and used for locking the output end and a second locking circuit which is arranged at the input end of the power supply module and used for controlling the power supply module to stop working;
the signal processing unit comprises a threshold circuit and/or a control chip for analyzing and processing a short-circuit signal and controlling a load LED light source; the threshold circuit judges the short circuit by comparing the signal acquired by the signal acquisition unit with a threshold trigger threshold; the control chip compares the signal acquired by the signal acquisition unit with a preset threshold range to judge the short circuit;
the short-circuit protection module also comprises a controller protection circuit, wherein the controller protection circuit is arranged between the load LED light source and the signal processing unit and is used for disconnecting the load LED light source from the signal processing unit when the short-circuit fault of the system is detected;
the load LED light source is a multi-path LED light source, the controller protection circuit comprises a plurality of switch devices or switch circuits, each path of LED light source is connected with the corresponding switch device or switch circuit, and when the system has a short-circuit fault, the controller protection circuit is disconnected to perform short-circuit protection on the load LED light source.
2. The LED short-circuit protection system of claim 1, wherein: the execution protection unit further comprises a buffer protection module used for reducing instant current impact when short-circuit faults occur, the input end of the buffer protection module is connected with the output end of the power supply module, and the output end of the buffer protection module is connected with the input end of the load LED light source.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610357639.4A CN107438302B (en) | 2016-05-26 | 2016-05-26 | LED short-circuit protection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610357639.4A CN107438302B (en) | 2016-05-26 | 2016-05-26 | LED short-circuit protection system |
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| CN107438302A CN107438302A (en) | 2017-12-05 |
| CN107438302B true CN107438302B (en) | 2020-05-29 |
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| JP2020155203A (en) * | 2019-03-18 | 2020-09-24 | セイコーエプソン株式会社 | Light emission control device, light source device and projection type video display device |
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| US9192014B2 (en) * | 2011-07-19 | 2015-11-17 | Nxp B.V. | LED short circuit protection |
| CN104078921B (en) * | 2013-03-28 | 2018-05-04 | 赛尔富电子有限公司 | A kind of controller with short-circuit protection |
| CN203658552U (en) * | 2013-11-12 | 2014-06-18 | 北汽福田汽车股份有限公司 | Low side driving circuit capable of being used for detecting short circuit of power supply |
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