CN218727901U

CN218727901U - Lighting lamp LED fault detection circuit and device

Info

Publication number: CN218727901U
Application number: CN202220402193.3U
Authority: CN
Inventors: 刘真照; 程祥光; 蒋磊
Original assignee: Shenzhen Hi Tech Investment Sanjiang Electronics Co ltd
Current assignee: Shenzhen Hi Tech Investment Sanjiang Electronics Co ltd
Priority date: 2022-02-25
Filing date: 2022-02-25
Publication date: 2023-03-24
Anticipated expiration: 2032-02-25

Abstract

The utility model discloses a light LED fault detection circuit and device, a light LED fault detection circuit includes: the LED driving circuit comprises an input power supply, a voltage stabilizing module, a control module, a constant current driving module, a first path of series-connected LED module, a first voltage dividing module and a second voltage dividing module; the input power supply is used for connecting the anode of the first path of series LED module after flowing through the constant current driving module to generate LED positive voltage; the constant current driving module is used for driving the first path of serial LED module to work so as to generate a first LED negative pressure; the first sampling module is used for sampling the positive pressure of the LED after being divided by the first voltage division module; the second sampling module is used for sampling the first LED negative pressure divided by the second voltage division module; the control module is used for acquiring the voltage difference between the positive pressure of the LED and the negative pressure of the first LED so as to realize fault detection of the first path of serial LED module. The utility model discloses can carry out accurate monitoring so that maintain and change LED's fault condition.

Description

Lighting lamp LED fault detection circuit and device

Technical Field

The utility model relates to a LED control technical field especially relates to a light LED fault detection circuit and device.

Background

In recent years, with the rapid development of lighting technology and the increasing of intelligent buildings, the fire emergency lighting regulation standard is continuously perfected, the varieties of fire emergency lighting lamps are continuously increased, the performance is continuously improved, and the fire emergency lighting lamps are widely applied and developed.

For example, in a fire emergency lighting fixture, an LED lamp bead is a key device, and the model, parameters, pictures and lamp bead manufacturers of the LED lamp bead must be declared when applying for national mandatory certification detection, and cannot be changed at will. According to the national standard, the fire-fighting emergency lighting lamp is non-continuous, and is in a normally standby state; in order to ensure that the LED lamp beads can be normally used when the fire-fighting emergency starting is carried out, the state of the LED lamp beads needs to be monitored in real time, and the fault condition needs to be timely prompted so as to be maintained and replaced.

However, the emergency lighting lamp has a large current when it is turned on, and only a small resistor can be connected in series in the circuit, so that the condition of the light source cannot be detected through the resistor. The prior art has the following disadvantages for light source fault detection: 1. part of non-normal products directly do not detect the faults of the LED lamp beads and are difficult to find due to the fact that the LED lamp beads are normally in a turned-off state; 2. the condition of LED complete short circuit is only detected by partial products, protection can be started during the complete short circuit, the detection is easy, but open circuit of LED lamp beads or short circuit of individual LED lamp beads is not judged, and 'work with injury' occurs during emergency lighting; 3. most products are used for detecting the short circuit/open circuit condition of a lamp panel power line by connecting the lamp panel with a large resistor in parallel, but the actual LED lamp beads cannot be distinguished due to partial short circuit or open circuit. Therefore, the invention provides a reliable lighting lamp LED fault detection circuit, which is a problem to be solved urgently by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a light LED fault detection circuit and device, in this scheme, control module passes through AD sampling, and the positive end voltage and the negative end voltage of real-time supervision multichannel LED series module judge LED for short-circuit fault or open circuit fault through the variable quantity of judging the voltage difference to confirm short-circuit fault LED's quantity through the voltage difference, realized the accurate monitoring to light LED trouble, it is efficient.

In order to solve the technical problem, the application provides an illuminating lamp LED fault detection circuit, which comprises an input power supply, a voltage stabilizing module, a control module, a constant current driving module, a first path of series-connected LED module, a first voltage dividing module and a second voltage dividing module;

the input power supply is respectively and electrically connected with the voltage stabilizing module and the constant current driving module, the voltage stabilizing module is electrically connected with the control module, and the constant current driving module is respectively and electrically connected with the positive electrode of the first path of series-connected LED module and the negative electrode of the first path of series-connected LED module;

the control module comprises a processing module, a first sampling module and a second sampling module, the first sampling module is electrically connected with the first voltage division module, the first voltage division module is electrically connected with the anode of the first path of series-connected LED module, the second voltage division module is electrically connected with the cathode of the first path of series-connected LED module, and the processing module is respectively electrically connected with the first sampling module and the second sampling module;

the input power supply is used for connecting the anode of the first path of series LED module after flowing through the constant current driving module to generate LED positive voltage;

the constant current driving module is used for driving the first path of series-connected LED module to work so as to generate a first LED negative pressure;

the first sampling module is used for sampling the positive pressure of the LED after the voltage division by the first voltage division module;

the second sampling module is used for sampling the first LED negative pressure divided by the second voltage division module;

the control module is used for obtaining the voltage difference between the positive voltage of the LED and the negative voltage of the first LED so as to realize fault detection of the first path of serially connected LED module.

Preferably, the lighting lamp LED fault detection circuit further includes a second series LED module, a third voltage division module, a first isolation module, and a second isolation module;

the second path of series-connected LED modules is connected with the first path of series-connected LED modules in parallel;

the constant current driving module is electrically connected with the second path of series-connected LED modules, and the first voltage division module is electrically connected with the positive electrode of the second path of series-connected LED modules;

the first isolation module is electrically connected with the first path of series-connected LED module, the constant current driving module and the second voltage division module respectively; the second isolation module is electrically connected with the second path of series-connected LED module, the constant current driving module and the third voltage division module respectively;

the control module further comprises a third sampling module, the third sampling module is electrically connected with the processing module and the third voltage division module respectively, and the third voltage division module is electrically connected with the negative electrode of the second path of series-connected LED modules;

the input power supply is used for connecting the anode of the second path of series LED module after flowing through the constant current driving module to generate LED positive voltage;

the constant current driving module is used for driving the second path of serial LED modules to work so as to generate second LED negative pressure;

the first isolation module is used for realizing negative pressure detection on the first path of serially connected LED modules, and the second isolation module is used for realizing negative pressure detection on the second path of serially connected LED modules;

the third sampling module is used for sampling the second LED negative pressure after being subjected to partial pressure by the third voltage division module;

the control module is used for acquiring the voltage difference between the LED positive voltage and the second LED negative voltage so as to realize fault detection of the second path of series-connected LED modules.

Preferably, the lighting lamp LED fault detection circuit includes a third path of series-connected LED modules, a fourth voltage division module, and a third isolation module;

the third path of series-connected LED module is connected with the second path of series-connected LED module in parallel;

the constant current driving module is electrically connected with the third path of series-connected LED modules, and the first voltage division module is electrically connected with the positive electrode of the third path of series-connected LED modules;

the third isolation module is electrically connected with the third path of series-connected LED module, the constant current driving module and the fourth voltage dividing module respectively;

the control module further comprises a fourth sampling module, the fourth sampling module is electrically connected with the processing module and the fourth voltage division module respectively, and the fourth voltage division module is electrically connected with the negative electrode of the third path of series-connected LED modules;

the input power supply is used for switching in the anode of the third path of series-connected LED modules after flowing through the constant current driving module so as to generate LED positive voltage;

the constant current driving module is used for driving the third path of series-connected LED module to work so as to generate third LED negative pressure;

the third isolation module is used for realizing negative pressure detection on the third path of series-connected LED modules;

the fourth sampling module is used for sampling the third LED negative pressure after the voltage division by the fourth voltage division module;

the control module is used for acquiring the voltage difference between the positive voltage of the LED and the negative voltage of the third LED so as to realize fault detection of the third series LED module.

Preferably, the input power supply comprises a power input port, a fuse, a transient suppression diode and a rectifier bridge;

the power input port is electrically connected with the first end of the transient suppression diode and the first end of the rectifier bridge respectively, the second end of the power input port is electrically connected with the first end of the fuse, the second end of the fuse is electrically connected with the second end of the transient suppression diode and the second end of the rectifier bridge respectively, and the third end and the fourth end of the rectifier bridge are electrically connected with the voltage stabilizing module.

Preferably, the constant current driving module comprises a constant current driver, a first diode and an inductor;

the first end of the constant current driver is electrically connected with the voltage stabilizing module and the cathode of the first diode respectively, the second end of the constant current driver is electrically connected with the first voltage dividing module and the anode of the first path of serially connected LED module respectively, the third end of the constant current driver is electrically connected with the control module, the fourth end and the fifth end of the constant current driver are electrically connected with the first end of the inductor, and the second end of the inductor is electrically connected with the cathode of the first path of serially connected LED module and the second voltage dividing module respectively.

Preferably, the constant current driving module further includes a first resistor, a second resistor, a third resistor, and a fourth resistor;

the first end of the first resistor is respectively and electrically connected with the first end of the second resistor, the second end of the constant current driver, the first voltage division module and the anode of the first path of series LED module, the second end of the first resistor is respectively and electrically connected with the second end of the second resistor, the voltage stabilization module and the cathode of the first diode, the first end of the third resistor is respectively and electrically connected with the third end of the constant current driver and the first end of the fourth resistor, the second end of the third resistor is electrically connected with the control module, and the second end of the fourth resistor is grounded.

Preferably, the first voltage division module comprises a fifth resistor and a sixth resistor;

the first end of the fifth resistor is electrically connected with the constant current driving module and the anode of the first series LED module, the second end of the fifth resistor is electrically connected with the first sampling module and the first end of the sixth resistor, and the second end of the sixth resistor is grounded.

Preferably, the first voltage division module comprises a seventh resistor, an eighth resistor and a first capacitor;

the first end of the seventh resistor is electrically connected with the constant current driving module and the anode of the first series-connected LED module, the second end of the seventh resistor is electrically connected with the first end of the fifth resistor, the first end of the eighth resistor is electrically connected with the second end of the fifth resistor, the first end of the sixth resistor and the first end of the first capacitor, the second end of the eighth resistor is electrically connected with the first sampling module, and the second end of the first capacitor is grounded.

Preferably, the first isolation module comprises a second diode;

the anode of the second diode is electrically connected with the cathode of the first path of series LED module and the second voltage division module respectively, and the cathode of the second diode is electrically connected with the constant current driving module.

In order to solve the technical problem, the application further provides a device, which comprises the lighting lamp LED fault detection circuit.

The utility model discloses a light LED fault detection circuit has following beneficial effect, the utility model discloses a light LED fault detection circuit includes: the LED driving circuit comprises an input power supply, a voltage stabilizing module, a control module, a constant current driving module, a first path of series-connected LED module, a first voltage dividing module and a second voltage dividing module; the input power supply is used for being connected with the anode of the first path of series LED module after flowing through the constant current driving module so as to generate LED positive voltage; the constant current driving module is used for driving the first path of serial LED module to work so as to generate a first LED negative pressure; the first sampling module is used for sampling the positive pressure of the LED after being divided by the first voltage division module; the second sampling module is used for sampling the first LED negative pressure after being divided by the second voltage division module; the control module is used for acquiring the voltage difference between the positive pressure of the LED and the negative pressure of the first LED so as to realize fault detection of the first path of serial LED module. In the scheme, the control module samples through the AD, monitors the positive end voltage and the negative end voltage of the first series LED module in real time, judges whether the LED is in a short-circuit fault or an open-circuit fault through the variable quantity of the judged voltage difference, determines the quantity of short-circuit fault LEDs through the voltage difference, realizes accurate monitoring on LED faults of the lighting lamp, and is high in efficiency. Therefore, the utility model discloses can carry out accurate monitoring so that maintain and change LED's fault condition.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work according to the drawings:

fig. 1 is a schematic block diagram of a lighting lamp LED failure detection circuit according to a preferred embodiment of the present invention;

fig. 2 is a schematic block diagram of a lighting lamp LED failure detection circuit according to another preferred embodiment of the present invention;

fig. 3 is a schematic circuit diagram of a lighting lamp LED fault detection circuit according to a preferred embodiment of the present invention;

fig. 4 is a specific circuit diagram of a lighting lamp LED fault detection circuit according to a preferred embodiment of the present invention.

Detailed Description

The core of the utility model is to provide a light LED fault detection circuit and device, can carry out accurate monitoring so that maintain and change LED's fault state.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example one

Fig. 1 is a schematic structural diagram of an illumination lamp LED fault detection circuit provided in the present application, including an input power supply 1, a voltage stabilizing module 2, a control module 3, a constant current driving module 4, a first path of series-connected LED module 5, a first voltage dividing module 6, and a second voltage dividing module 7;

the input power supply 1 is respectively and electrically connected with the voltage stabilizing module 2 and the constant current driving module 4, the voltage stabilizing module 2 is electrically connected with the control module 3, and the constant current driving module 4 is respectively and electrically connected with the anode of the first path of series-connected LED module 5 and the cathode of the first path of series-connected LED module 5;

the control module 3 comprises a processing module 31, a first sampling module 32 and a second sampling module 33, the first sampling module 32 is electrically connected with the first voltage division module 6, the first voltage division module 6 is electrically connected with the positive electrode of the first path of series-connected LED module 5, the second voltage division module 7 is electrically connected with the negative electrode of the first path of series-connected LED module 5, and the processing module 31 is respectively electrically connected with the first sampling module 32 and the second sampling module 33;

the input power supply 1 is used for connecting the positive electrode of the first path of series LED module 5 after flowing through the constant current driving module so as to generate LED positive voltage;

the constant current driving module 4 is used for driving the first path of serial LED module 5 to work so as to generate a first LED negative pressure;

the first sampling module 32 is used for sampling the positive voltage of the LED after being divided by the first voltage division module 6;

the second sampling module 33 is used for sampling the first LED negative pressure divided by the second voltage division module 7;

the control module 3 is configured to obtain a voltage difference between the positive LED voltage and the negative LED voltage to implement fault detection of the first path of serial LED module 5.

Among the prior art, the fire emergency lighting lamp is in a turned-off state during standby, and is in a turned-on state to illuminate the surrounding area during emergency starting. In order to ensure that the fire-fighting emergency lighting lamp can be normally lightened during emergency evacuation, the state of the key LED lamp bead needs to be monitored in real time, and if a fault occurs, the key LED lamp bead should be timely reported so as to be maintained and replaced.

On one hand, when the LED fault is detected, the LED lamp beads are turned off when in standby, the light-emitting diodes are in a cut-off state, no current exists in a loop, and whether the LED is in fault or not cannot be judged; on the other hand, the fire-fighting emergency illuminating lamp is usually over 3W, the light source part is basically a multi-LED series-parallel combination, when one or more short circuits occur in series-connected LEDs or one or more open circuits occur in multi-path parallel connection, part of LEDs are still intact at the moment, and the fault LEDs cannot be accurately detected.

In order to solve the above problems, the utility model provides a lighting lamp LED fault detection circuit, which detects the voltage difference between the front end and the rear end of a series LED module in real time, wherein the voltage difference corresponds to the sum of the voltages of one or more lamp beads in the series LED module; the voltage of the positive electrode of the series LED module can change along with the voltage of the bus and can also be constant voltage. In this embodiment, the LED failures are classified into short circuits and open circuits: 1) When a single or a plurality of lamp beads are in short circuit in a single loop, the voltage difference between the anode and the cathode of the serially connected LED module is reduced to different degrees, and whether the LED is in short circuit is judged by judging the variation of the voltage difference; 2) And (3) an open circuit fault, namely when more than 1 lamp bead in the series LED module is damaged and opened, the loop is not communicated, and the voltage of the cathode of the series LED module is basically zero, so that the series LED module is judged to be open.

In summary, the present application provides a lighting lamp LED fault detection circuit, in the scheme, an input power supply 1 is used for connecting to a positive electrode of a first series LED module 5 after passing through a constant current driving module to generate a positive LED voltage; the constant current driving module 4 is used for driving the first path of serial LED module 5 to work so as to generate a first LED negative pressure; the first sampling module 32 is used for sampling the positive voltage of the LED after being divided by the first voltage division module 6; the second sampling module 33 is used for sampling the first LED negative pressure divided by the second voltage division module 7; the control module 3 is used for acquiring a voltage difference between the positive voltage of the LED and the negative voltage of the first LED to detect a fault of the first path of serial LED module 5. In this scheme, control module 3 passes through AD sampling, and the positive terminal voltage and the negative terminal voltage of the first series connection LED module of real-time supervision are judged LED for short-circuit fault or open circuit fault through the variable quantity of judging the voltage difference to confirm short-circuit fault LED's quantity through the voltage difference, realized the accurate monitoring to the lamp LED trouble, it is efficient. Therefore, the utility model discloses can carry out accurate monitoring so that maintain and change LED's fault condition.

On the basis of the above-described embodiment:

referring to fig. 2, fig. 2 is a schematic structural diagram of another lighting lamp LED fault detection circuit provided in the present application.

As a preferred embodiment, the lighting lamp LED fault detection circuit further includes a second series LED module 8, a third voltage division module 9, a first isolation module 10, and a second isolation module 11;

the second path of series-connected LED modules 8 is connected with the first path of series-connected LED modules 5 in parallel;

the constant current driving module 4 is electrically connected with the second series-connected LED module 8, and the first voltage division module 6 is electrically connected with the positive electrode of the second series-connected LED module 8;

the first isolation module 10 is electrically connected with the first path of series-connected LED module 5, the constant current driving module 4 and the second voltage division module 7 respectively; the second isolation module 11 is electrically connected with the second series-connected LED module 8, the constant current driving module 4 and the third voltage division module 9 respectively;

the control module 3 further comprises a third sampling module 34, the third sampling module 34 is electrically connected with the processing module 31 and the third voltage dividing module 9 respectively, and the third voltage dividing module 9 is electrically connected with the negative electrode of the second path of series-connected LED modules 8;

the input power supply 1 is used for connecting the anode of the second path of series LED module 8 after flowing through the constant current driving module to generate LED positive voltage;

the constant current driving module 4 is used for driving the second path of serial LED module 8 to work so as to generate a second LED negative pressure;

the first isolation module 10 is used for realizing negative pressure detection on the first path of series-connected LED modules 5, and the second isolation module 11 is used for realizing negative pressure detection on the second path of series-connected LED modules 8;

the third sampling module 34 is used for sampling the second LED negative pressure divided by the third voltage division module 9;

the control module 3 is configured to obtain a voltage difference between the LED positive voltage and the second LED negative voltage to implement fault detection of the second path of series-connected LED modules 8.

As a preferred embodiment, a lighting lamp LED fault detection circuit includes a third series LED module 12, a fourth voltage division module 13, and a third isolation module 14;

the third path of series-connected LED module 12 is connected with the second path of series-connected LED module 8 in parallel;

the constant current driving module 4 is electrically connected with the third path of series-connected LED module 12, and the first voltage division module 6 is electrically connected with the positive electrode of the third path of series-connected LED module 12;

the third isolation module 14 is electrically connected with the third path of series-connected LED module 12, the constant current driving module 4 and the fourth voltage dividing module 13 respectively;

the control module 3 further comprises a fourth sampling module, the fourth sampling module is electrically connected with the processing module 31 and the fourth voltage dividing module 13 respectively, and the fourth voltage dividing module 13 is electrically connected with the negative electrode of the third path of series-connected LED modules 12;

the input power supply 1 is used for connecting the anode of a third path of series-connected LED modules after flowing through the constant current driving module 4 so as to generate LED positive voltage;

the constant current driving module 4 is used for driving the third path of series-connected LED modules to work so as to generate third LED negative pressure;

the third isolation module 14 is configured to implement negative voltage detection on the third path of series-connected LED modules 12;

the fourth sampling module is used for sampling the third LED negative pressure after being divided by the fourth voltage dividing module 13;

the control module 3 is configured to obtain a voltage difference between the LED positive voltage and the third LED negative voltage to implement fault detection of the third series LED module 12.

Specifically, an input power supply is connected to the positive electrodes of the LED matrixes of the first path of series-connected LED module 5, the second path of series-connected LED module 8 and the third path of series-connected LED module 12 after passing through the constant current driving module 4, and is LED positive voltage, and the LED positive voltage shunts three paths of power supply according to the number of parallel paths. In the present application, LED matrices are divided into two categories: 1. the single string only comprises one path of serial LED modules without an isolation module, and the control module samples the positive voltage and the negative voltage of the serial LED modules for judgment through voltage division of the voltage division module; 2. the LED voltage detection device comprises a plurality of LED modules, a first series-connected LED module 5, a second series-connected LED module 8 and a third series-connected LED module 12, wherein the first series-connected LED module, the second series-connected LED module and the third series-connected LED module are divided into three paths and connected in parallel, each path is provided with an isolation module so as to realize independent detection of the cathode voltage of each series-connected LED module, and a control module carries out judgment by dividing the voltage through a voltage division module, sampling the anode voltage of the LED modules in series connection in multiple paths and sampling the cathode voltage of the LED modules in series connection in multiple paths respectively.

Referring to fig. 3, fig. 3 is a schematic structural diagram of another lighting lamp LED fault detection circuit provided in the present application.

And the control module monitors the positive voltage and the negative voltage of the serial LED modules in real time through AD sampling. In the single-string mode, only the voltage of the cathode of one path of series-connected LED modules is monitored; in the multi-string and multi-parallel mode, the cathode voltage of the multi-path serial LED modules needs to be monitored simultaneously, and each path can be detected in a time-sharing and segmented mode in an actual scene. It is understood that the number of the serial LED modules of the present embodiment is specifically set according to the requirement, and is not limited herein.

In this embodiment, the LED lamp beads are in an off state during standby, a weak current is provided to the multiple paths of series-connected LED modules through the voltage dividing module, the LED is maintained to be weakly connected, and at this time, the LED voltage is far lower than that of the LED when the LED is normally turned on, but the LED voltage is enough for the control module to detect and identify; LED lamp pearl is in the state of lighting during emergent, leads to the heavy current of being invariable basically through constant current drive module guarantee LED, and LED voltage is in normal application range this moment.

Under normal conditions, the LED module is connected in series in a single way, the voltage difference between the anode voltage and the cathode voltage is basically constant, and the voltage difference is divided into two modes according to the extinguishing state and the lighting state; in one embodiment, when the voltage difference detected in the same mode is smaller than a set value, the LED is considered to have a short-circuit fault, and different set values are set to correspond to single or multiple short-circuit conditions; in another embodiment, the output voltage of the constant current driving module is constant, that is, the voltage of the positive electrode of the series LED module is constant, and at this time, it is determined that the LED is short-circuited only by determining that the voltage of the negative electrode of the series LED module is greater than a set value, and different set values correspond to a single short-circuit condition or multiple short-circuit conditions. In the off or on state, when the single-circuit serial LED module is open-circuited, the voltage of the negative terminal of the serial LED module is basically reduced to 0V, and the serial LED module is considered to have an LED open-circuit fault when the voltage is lower than an open-circuit set threshold.

It can be understood that the invention can also be applied to the condition of wide-range input power supply, and the invention is not limited to fire-fighting emergency lighting lamps, and is also applicable to common lighting lamps using LEDs as light sources; in practical application, along with the increase of the wiring length and the aggravation of a load, the input voltage at the rear end can be reduced in different degrees, but the LED voltage is fixed in the application, so that the voltage difference is used for judging the fault condition and the fault condition is not influenced by the input voltage, and the accuracy rate is high.

Referring to fig. 4, fig. 4 is a schematic circuit diagram of another lighting lamp LED fault detection circuit provided in the present application.

As a preferred embodiment, the input power supply 1 includes a power input port P1, a fuse F1, a transient suppression diode VD1, and a rectifier bridge DB1;

the power input port P1 is respectively electrically connected with the first end of the transient suppression diode VD1 and the first end of the rectifier bridge DB1, the second end of the power input port P1 is electrically connected with the first end of the fuse F1, the second end of the fuse F1 is respectively electrically connected with the second end of the transient suppression diode VD1 and the second end of the rectifier bridge DB1, and the third end and the fourth end of the rectifier bridge DB1 are electrically connected with the voltage stabilizing module 2. It can be understood that the fuse F1 is used to realize overload protection for the rear-stage component; the transient suppression diode VD1 is used for preventing lightning surge and reducing the impact on a post-stage circuit; rectifier bridge DB1 is used for realizing the nonpolarity of power input end and connects, makes things convenient for the engineering to use.

In this embodiment, the voltage stabilizing module 2 is configured to output a stable power to the control module 3 and the constant current driving module 4, and the specific structure of the voltage stabilizing module 2 may refer to fig. 4, which is not described herein again. In yet another preferred embodiment, the voltage regulator module may employ a voltage regulator circuit of the prior art, and is not limited herein. The control module 3 is an MCU, and the model of the control module 3 is not limited herein.

As a preferred embodiment, the constant current driving module 4 includes a constant current driver U1, a first diode D13, and an inductor L1;

the first end of the constant current driver U1 is electrically connected with the cathode of the voltage stabilizing module 2 and the cathode of the first diode D13, the second end of the constant current driver U1 is electrically connected with the anode of the first voltage dividing module 6 and the anode of the first series LED module 5, the third end of the constant current driver U1 is electrically connected with the control module 3, the fifth end and the sixth end of the constant current driver U1 are electrically connected with the first end of the inductor L1, and the second end of the inductor L1 is electrically connected with the cathode of the first series LED module 5 and the second voltage dividing module 7. The constant current driver U1 is used for driving the multi-path series LED modules to work, and the type of the constant current driver U1 is not particularly limited in the application; the first diode D13 is used for realizing follow current, the inductor L1 is used for realizing energy storage, and the first diode D13 is matched with the inductor L to enable the output to form a complete loop.

As a preferred embodiment, the constant current driving module 4 further includes a first resistor R6, a second resistor R7, a third resistor R10, and a fourth resistor R12;

the first end of the first resistor R6 is respectively electrically connected with the first end of the second resistor R7, the second end of the constant current driver, the first voltage division module 6 and the anode of the first path of series LED module, the second end of the first resistor R6 is respectively electrically connected with the second end of the second resistor R7, the voltage stabilizing module 2 and the cathode of the first diode D13, the first end of the third resistor R10 is respectively electrically connected with the third end of the constant current driver and the first end of the fourth resistor R12, the second end of the third resistor R10 is electrically connected with the control module 3, and the second end of the fourth resistor R12 is grounded. It can be understood that the first resistor R6 and the second resistor R7 are arranged to limit the LED current, and the third resistor R10 and the fourth resistor R12 are arranged to receive a voltage-dividing current-limiting signal, where the voltage-dividing current-limiting signal is used to control the start/stop of the constant current driver.

As a preferred embodiment, the first voltage dividing module 6 includes a fifth resistor R17 and a sixth resistor R21;

a first end of the fifth resistor R17 is electrically connected to the positive electrodes of the constant current driving module 4 and the first series LED module 5, a second end of the fifth resistor R17 is electrically connected to the first sampling module 32 and the first end of the sixth resistor R21, and a second end of the sixth resistor R21 is grounded.

As a preferred embodiment, the first voltage division module 6 includes a seventh resistor R41, an eighth resistor R19, and a first capacitor C7;

a first end of the seventh resistor R41 is electrically connected to the constant current driving module 4 and the first series LED module, a second end of the seventh resistor R41 is electrically connected to a first end of the fifth resistor, a first end of the eighth resistor R19 is electrically connected to a second end of the fifth resistor, a first end of the sixth resistor, and a first end of the first capacitor C7, a second end of the eighth resistor R19 is electrically connected to the first sampling module 32, and a second end of the first capacitor C7 is grounded. In this embodiment, the LED is in an off state during standby, and the voltage is divided by the resistor in the voltage dividing module to provide a weak current to the LED, so as to maintain the LED to be weakly turned on, and at this time, the voltage of the LED is far lower than that of the LED normally turned on, but enough for the MCU to detect and identify the LED. The specific structures of the second voltage dividing module, the third voltage dividing module and the fourth voltage dividing module in this embodiment are the same as those of the first voltage dividing module, and refer to fig. 4, which is not described herein again.

As a preferred embodiment, the first isolation module 10 includes a second diode D10;

the anode of the second diode D10 is electrically connected to the cathode of the first path of series-connected LED module 5 and the second voltage division module 7, respectively, and the cathode of the second diode D10 is electrically connected to the constant current driving module 4. The second diode D10 is used for realizing the isolation between the first path of series-connected LED modules and the second path of series-connected LED modules, so that the control module can detect the status of each path of series-connected LED modules. In this embodiment, the second isolation module and the third isolation module may be configured as diodes, and are not limited herein.

The application also provides a device for detecting the faults of the illuminating lamp LED, which comprises a circuit for detecting the faults of the illuminating lamp LED.

For the introduction of the lighting lamp LED fault detection circuit provided in the present application, please refer to the above embodiments, which are not described herein again.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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 phrases "comprising a component of' 8230; \8230;" does not exclude the presence of additional identical elements in the 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

1. A lamp LED fault detection circuit, comprising: the LED driving circuit comprises an input power supply, a voltage stabilizing module, a control module, a constant current driving module, a first path of series-connected LED module, a first voltage dividing module and a second voltage dividing module;

the control module comprises a processing module, a first sampling module and a second sampling module, the first sampling module is electrically connected with the first voltage division module, the first voltage division module is electrically connected with the anode of the first path of serial LED module, the second voltage division module is electrically connected with the cathode of the first path of serial LED module, and the processing module is respectively electrically connected with the first sampling module and the second sampling module;

the constant current driving module is used for driving the first path of series LED module to work so as to generate a first LED negative pressure;

the first sampling module is used for sampling the positive pressure of the LED after being divided by the first voltage division module;

the control module is used for acquiring the voltage difference between the positive pressure of the LED and the negative pressure of the first LED so as to realize fault detection of the first path of serial LED module.

2. The lamp LED fault detection circuit according to claim 1, further comprising a second series LED module, a third voltage divider module, a first isolation module and a second isolation module;

the second path of series-connected LED module is connected with the first path of series-connected LED module in parallel;

the first isolation module is electrically connected with the first path of series-connected LED module, the constant current driving module and the second voltage division module respectively; the second isolation module is electrically connected with the second series-connected LED module, the constant current driving module and the third voltage division module respectively;

the control module further comprises a third sampling module, the third sampling module is respectively and electrically connected with the processing module and the third voltage division module, and the third voltage division module is electrically connected with the negative electrode of the second path of series-connected LED module;

the constant current driving module is used for driving the second path of serial LED module to work so as to generate a second LED negative pressure;

the third sampling module is used for sampling the second LED negative pressure after the third voltage division module divides the voltage;

3. The lamp LED fault detection circuit according to claim 2, wherein the lamp LED fault detection circuit comprises a third series LED module, a fourth voltage divider module, and a third isolation module;

the constant current driving module is used for driving the third path of series-connected LED module to work so as to generate a third LED negative pressure;

the fourth sampling module is used for sampling the third LED negative pressure divided by the fourth voltage dividing module;

4. The lamp LED fault detection circuit according to claim 1, wherein said input power source comprises a power input port, a fuse, a transient suppression diode and a rectifier bridge;

5. The lighting lamp LED fault detection circuit according to claim 1, wherein the constant current driving module comprises a constant current driver, a first diode and an inductor;

the first end of the constant current driver is respectively electrically connected with the voltage stabilizing module and the cathode of the first diode, the second end of the constant current driver is respectively electrically connected with the first voltage dividing module and the anode of the first series LED module, the third end of the constant current driver is electrically connected with the control module, the fourth end and the fifth end of the constant current driver are both electrically connected with the first end of the inductor, and the second end of the inductor is respectively electrically connected with the cathode of the first series LED module and the second voltage dividing module.

6. The lighting lamp LED fault detection circuit according to claim 5, wherein the constant current driving module further comprises a first resistor, a second resistor, a third resistor and a fourth resistor;

the first end of the first resistor is electrically connected with the first end of the second resistor, the second end of the constant current driver, the first voltage division module and the anode of the first series LED module respectively, the second end of the first resistor is electrically connected with the second end of the second resistor, the voltage stabilization module and the cathode of the first diode respectively, the first end of the third resistor is electrically connected with the third end of the constant current driver and the first end of the fourth resistor respectively, the second end of the third resistor is electrically connected with the control module, and the second end of the fourth resistor is grounded.

7. The lamp LED fault detection circuit according to claim 1, wherein the first voltage division module comprises a fifth resistor and a sixth resistor;

8. The cargo lamp LED fault detection circuit according to claim 7, wherein said first voltage division module comprises a seventh resistor, an eighth resistor and a first capacitor;

9. The lamp LED fault detection circuit according to claim 2, wherein said first isolation module comprises a second diode;

10. A lamp LED failure detection device, comprising a lamp LED failure detection circuit according to any one of claims 1 to 9.