CN110418452A - For monitoring the circuit of illuminating circuit - Google Patents
For monitoring the circuit of illuminating circuit Download PDFInfo
- Publication number
- CN110418452A CN110418452A CN201810407341.9A CN201810407341A CN110418452A CN 110418452 A CN110418452 A CN 110418452A CN 201810407341 A CN201810407341 A CN 201810407341A CN 110418452 A CN110418452 A CN 110418452A
- Authority
- CN
- China
- Prior art keywords
- circuit
- node
- transistor
- output
- output module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
-
- 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
- H05B45/347—Dynamic headroom control [DHC]
-
- 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
Abstract
Present disclose provides a kind of circuit for monitoring illuminating circuit, the illuminating circuit includes one or more luminous branches.The circuit includes one or more link blocks and output module.Each of one or more of link blocks have the first end being connected with the test point in respective branch and the second end being connected with first node, and be configured as being compared by will test the potential difference a little between first node with threshold voltage, to control the conducting of electric current.The output module has the first end being connected with the first node and the second end being connected with output terminal, and is configured as controlling output according to the current potential of first node.
Description
Technical field
This disclosure relates to field of electronic device, and in particular, to a kind of for monitoring the circuit of illuminating circuit.
Background technique
Illuminating circuit is widely used in all trades and professions.Specifically, illuminating circuit often uses LED as luminous group at present
Part to be used for various fields, for example, architectural lighting, vehicle head taillight, including personal computer and high-definition television
Liquid crystal display backlight and flash lamp etc..In the lighting system of large area, multiple LED are usually conspired to create into LED string
Carry out using.Especially in vehicle application, LED string is very possible to occur open circuit, cause the string LED can not normal illumination, very
To being possible to jeopardize personal safety.
Therefore, it is necessary to a kind of electricity for being used to monitor illuminating circuit that can be detected in time to the abnormality of LED
Road.
Summary of the invention
The disclosure be to provide it is a kind of for monitoring the circuit of illuminating circuit, can be in time to the exception of illuminating circuit
State is detected, and it is on fire effectively to prevent power supply, and can realize with simpler and more economical implementation to luminous
The detection of circuit.
According to one aspect of the disclosure, provide it is a kind of for monitoring the circuit of illuminating circuit, wherein the luminous electricity
Road may include one or more luminous branches.Specifically, the circuit may include one or more link blocks and output
Module.Each of one or more of link blocks have the first end that is connected with the test point in respective branch and
The second end being connected with first node, and be configured as by will test a little potential difference and threshold voltage between first node
It is compared, to control the conducting of electric current.The output module have the first end that is connected with the first node and with it is defeated
The connected second end of terminal out, and be configured as controlling output according to the current potential of first node.
As an example, the link block, which can be configured as, is greater than the threshold value electricity in response to the potential difference
Pressure allows electric current to flow to the first node from the test point.
As another example, the link block can be implemented as diode, wherein the anode of the diode and detection
Point is connected and cathode is connected with first node.
As another example, the output module may include zener diode and transistor, wherein two pole of the pressure stabilizing
The cathode of pipe is connected with the first node, and anode is connected with the grid of the transistor；And the drain electrode of the transistor and
One of source electrode ground connection, and another is connected with the output terminal.
As another example, the output module may include zener diode and transistor, wherein two pole of the pressure stabilizing
One of the cathode of pipe and source electrode and drain electrode of the transistor are connected, and anode is connected to the ground；And the grid of the transistor with
The first node is connected, and another in its source electrode and drain electrode is connected with the output terminal.
As another example, the burning voltage of the zener diode can be equal to test point when branch works normally
Voltage.
As another example, the transistor may include PNP transistor.
As another example, the transistor may include NPN transistor.
As another example, the circuit can also include resistor, described resistor one end and the first node phase
Even, and its other end is connected with the output module.
According to another aspect of the present invention, a kind of luminescent system is additionally provided.The luminescent system may include: power supply,
Illuminating circuit and observation circuit.The illuminating circuit includes one or more luminous branches, wherein each luminous branch includes one
A or multiple luminescent devices and constant-current source, and it is configured as receiving electric power from power supply with one via constant-current source driving
Or multiple luminescent devices shine.The observation circuit can be configured as the monitoring illuminating circuit, and include: one or more
Link block, each of one or more of link blocks have the first end being connected with the test point in respective branch
And the second end being connected with first node, and be configured as by will test a little potential difference and threshold value between first node
Voltage is compared, to control the conducting of electric current；And output module, the output module has to be connected with the first node
First end and the second end that is connected with output terminal, and be configured as controlling output according to the current potential of first node.
Detailed description of the invention
In order to which the disclosure and its advantage is more fully understood, referring now to being described below in conjunction with attached drawing, in which:
Fig. 1 shows an exemplary circuit diagram of the circuit for monitoring illuminating circuit；
Fig. 2 shows another exemplary circuit diagrams of the circuit for monitoring illuminating circuit；
Fig. 3 shows the block diagram of the circuit for monitoring illuminating circuit according to one example embodiment of the disclosure；
Fig. 4 shows the circuit diagram of the circuit for monitoring illuminating circuit according to one example embodiment of the disclosure；With
And
Fig. 5 shows the circuit diagram of the circuit for monitoring illuminating circuit according to another example embodiment of the disclosure.
Specific embodiment
Hereinafter, will be described with reference to the accompanying drawings embodiment of the disclosure.However, it should be understood that these descriptions are only exemplary
, and it is not intended to limit the scope of the present disclosure.In addition, in the following description, descriptions of well-known structures and technologies are omitted, with
Avoid unnecessarily obscuring the concept of the disclosure.
Term as used herein is not intended to limit the disclosure just for the sake of description specific embodiment.Used here as
Word " one ", " one (kind) " and "the" etc. also should include " multiple ", " a variety of " the meaning, unless in addition context clearly refers to
Out.In addition, the terms "include", "comprise" as used herein etc. show the presence of the feature, step, operation and/or component,
But it is not excluded that in the presence of or add other one or more features, step, operation or component.In addition, in the present specification, removing
It non-clearly points out, otherwise term " triode " and " transistor " may be used interchangeably.
There are all terms (including technical and scientific term) as used herein those skilled in the art to be generally understood
Meaning, unless otherwise defined.It should be noted that term used herein should be interpreted that with consistent with the context of this specification
Meaning, without that should be explained with idealization or excessively mechanical mode.
Shown in the drawings of some block diagrams and/or flow chart.It should be understood that some sides in block diagram and/or flow chart
Frame or combinations thereof can be realized by computer program instructions.These computer program instructions can be supplied to general purpose computer,
The processor of special purpose computer or other programmable data processing units, so that these instructions are when executed by this processor can be with
Creation is for realizing function/operation device illustrated in these block diagrams and/or flow chart.
Therefore, the technology of the disclosure can be realized in the form of hardware and/or software (including firmware, microcode etc.).Separately
Outside, the technology of the disclosure can take the form of the computer program product on the computer-readable medium for being stored with instruction, should
Computer program product uses for instruction execution system or instruction execution system is combined to use.In the context of the disclosure
In, computer-readable medium, which can be, can include, store, transmitting, propagating or transmitting the arbitrary medium of instruction.For example, calculating
Machine readable medium can include but is not limited to electricity, magnetic, optical, electromagnetic, infrared or semiconductor system, device, device or propagation medium.
The specific example of computer-readable medium includes: magnetic memory apparatus, such as tape or hard disk (HDD)；Light storage device, such as CD
(CD-ROM)；Memory, such as random access memory (RAM) or flash memory；And/or wire/wireless communication link.
Embodiment of the disclosure provides a kind of illuminating circuit for monitoring including one or more luminous branches
Circuit.The circuit can in time detect the abnormality of illuminating circuit, and can be with simpler and more pass through
The implementation of Ji realizes the detection to illuminating circuit.The illuminating circuit of example embodiment can be applied to various according to the present invention
Field, for example, can be applied to such as architectural lighting, vehicle head taillight, including personal computer and high-definition television
The various illuminations and instruction system of the backlight of liquid crystal display and flash lamp etc..
Fig. 1 shows an exemplary circuit diagram of the circuit for monitoring illuminating circuit.Specifically, in this application,
Illuminating circuit is illustratively embodied as LED drive circuit, and the illuminating circuit includes multiple luminous branches.It is shown in Fig. 1
Circuit in, constant-current source is a kind of low side driving circuit closely and far from power end.Electricity on the left of the dotted line frame of Fig. 1
Road shows low side LED drive circuit, and the circuit inside dotted line frame shows the electricity for monitoring low side LED drive circuit
Road.
It include three luminous branches in low side LED drive circuit as shown in Figure 1, and each luminous branch routing one
A LED string is (for example, first string D11, D12 and D13；Second string D21, D22 and D23；And n-th string Dn1, Dn2 and Dn3) and one
A constant-current source (for example, I1, I2 and In) is constituted, and wherein LED string includes three LED.In low side LED drive circuit, LED string is straight
It connects and is connected with power supply (being shown as " VBAT ").It should be noted that the number of LED included by the quantity and LED string of the branch that shines
Amount is merely exemplary, and without being limited thereto.Observation circuit in dotted line frame is via in diode (D1, D2 and D3) and luminous branch
Test point be connected, and have accessory power supply (being shown as " V_5V ").When LED is under normal ON state, auxiliary
Power supply generates electric current and flows through R1, D4 and R2, obtains high voltage in output point (at V output) at this time.If some LED is breaking,
For example, D12 is breaking, then it will have electric current and flow through D1, D4 will be flowed through there is no electric current at this time, therefore, in output point (at V output)
Obtain low-voltage.
Although foregoing circuit can be realized the monitoring to low side LED drive circuit, due in low side LED drive circuit
Middle LED string is directly connected with power supply, so the danger on fire there are power supply.Therefore, it is necessary to a kind of safer driving electricity
Road and its observation circuit.
Fig. 2 shows another exemplary circuit diagrams of the circuit for monitoring illuminating circuit.Specifically, Fig. 2 proposes one
Kind flash LED drive circuit and the circuit for monitoring the flash LED drive circuit.So-called " flash " LED drive circuit
Refer to that constant-current source is located at source side and remotely.
As shown in Fig. 2, branch luminous for each of flash LED drive circuit, LED go here and there via constant-current source and power supply
It is connected.Since the resistance of constant-current source is infinitely great, the protection to power supply may be implemented, power supply is on fire to ask to efficiently solve
Topic, that is, provide a kind of driving circuit of safe illuminating circuit.For above-mentioned driving circuit, equally it is also required to supervise accordingly
Slowdown monitoring circuit.
The circuit for monitoring the flash LED drive circuit is shown in the dotted line frame of Fig. 2.In the circuit, it does not deposit
In accessory power supply, but each luminous branch requires to draw an output terminal by corresponding device, for example, for by
First LED string that D11, D12 and D13 are constituted draws output terminal (V output 1) from test point by resistor R5 and R6；It is right
In the second LED string being made of D21, D22 and D23, output terminal (V output is drawn from test point by resistor R3 and R4
2)；And n-th of LED for being made of Dn1, Dn2 and Dn3 goes here and there, and draws output terminal from test point by resistor R1 and R2
(V exports n).In addition, the port of reserved respective numbers is needed, to receive and analyze the defeated of each terminal for controller
Out.In this case, when LED is under normal ON state, each output terminal output is low-voltage.However, such as
Fruit some LED open circuit, for example, D12 is breaking, then the voltage of power supply will be applied directly to R5 and R6, therefore output terminal V
1 correspondingly output HIGH voltage of output.Controller determines luminous branch in response to receiving high voltage from output terminal (V output 1)
Middle generation open circuit simultaneously exports corresponding notification signal.
Although the monitoring to flash LED drive circuit may be implemented in foregoing circuit, however, since each branch requires to draw
Corresponding output terminal out, and there is no common elements in circuit, therefore, this observation circuit is expensive and structure is more multiple
It is miscellaneous.
To sum up, a kind of for monitoring the circuit of illuminating circuit, abnormality that can in time to luminous branch is needed
It is detected, it is on fire effectively to prevent power supply, and can realize with simpler and more economical implementation to illuminating circuit
Detection.
Fig. 3 shows the block diagram of the circuit for monitoring illuminating circuit according to one example embodiment of the disclosure.
As shown in figure 3, described for monitor the circuit of illuminating circuit to include the one or more indicated by appended drawing reference 110
Link block and the output module P indicated by appended drawing reference 120.Specifically, the link block includes respectively by appended drawing reference
The first link block C1, the second link block C2 and the n-th link block Cn that 110-1,110-2 and 110-n are indicated.It is one
Or each of multiple link blocks 110 have with the test point in respective branch (for example, the first test point M1, the second inspection
Measuring point M2 and the n-th test point Mn etc.) connected first end and the second end that is connected with first node A, and be configured as passing through
Corresponding test point is compared with the potential difference between first node A with threshold voltage, to control the conducting of electric current.Specifically
Ground, it is big that each of described link block C1, C2 and Cn can be configured as the potential difference in response to the link block both ends
In threshold voltage, electric current is allowed to flow to the first node from corresponding test point.In one embodiment, the link block can
To be embodied as diode, wherein the anode of the diode is connected and cathode is connected with first node with test point, threshold value at this time
Voltage can be implemented as the conducting voltage of diode.That is, permitting when the voltage at diode both ends is greater than its conducting voltage
Perhaps electric current is from corresponding test point (for example, one of M1, M2 and Mn flow to node A).
In addition, the output module P120 can have and the first node A first end being connected and and output end
Sub (V output) connected second end, and be configured as controlling the size of output according to the current potential of first node A.
Additionally or alternatively, the circuit can also include resistor, described resistor one end and the first node
It is connected, and its other end is connected with the output module.The resistor is configured as the size of electric current in limiting circuit, to protect
Protection circuit.
Circuit below with reference to Fig. 4 and Fig. 5 description according to disclosure example embodiment for monitoring illuminating circuit
Example embodiment.Specifically, Fig. 4 shows the circuit according to the disclosure one example embodiment for monitoring illuminating circuit
Circuit diagram.Circuit on the left of the dotted line frame of Fig. 4 shows flash LED drive circuit, and the circuit inside dotted line frame shows root
According to illustrated embodiments of the invention for monitoring the circuit of flash LED drive circuit.As described above, the circuit includes connection mould
Block 410 and output module 420.
As shown in the dotted line frame of Fig. 4, link block 410 is schematically embodied as diode D1, D2 and Dn, and export mould
Block 420 includes zener diode ZD1 and transistor Q1.Specifically, each of described diode D1, D2 and Dn anode with
Corresponding test point (M1, M2, Mn) in illuminating circuit is connected, and cathode is connected with first node (that is, node A is connected).It is described
The cathode of zener diode ZD1 is connected with node A, and the positive grid G with the transistor Q1 is connected, and its burning voltage is approximate
The voltage of test point when being worked normally equal to branch.For example, when, there are when three LED, can choose reverse breakdown in circuit
The zener diode ZD1 that voltage is about 6V.It can be implemented as it should be noted that the anode is connected with the grid G of the transistor Q1
The anode of the zener diode ZD1 is connected directly to the grid G of transistor Q1, or is indirectly connected with via resistor R1
To the grid G of transistor Q1.In this exemplary embodiment, one of the drain D and source S of the transistor Q1 can be grounded, and
Another can be connected with the output terminal (V output).
When luminous branch works normally, since the voltage of ZD1 is approximately equal to the electricity of test point when branch works normally
Pressure, so the voltage at the both ends diode D1, D2 and Dn is approximately uniform, that is to say, that diode D1, D2 and Dn cut-off are not led
It is logical.Output terminal (V output) is set to hanging level (then will be high level if there is pull-up voltage on inside).In the implementation
In example, the voltage of each LED can be about 2V, and three concatenated voltages of LED will be 6V.When LED is worked normally, diode
D1, D2 and Dn, zener diode ZD1 and triode Q1 do not work, and leading to (V output) output is high level.
When some LED (for example, D12) open circuit, the voltage difference of diode D1 is greater than its conducting voltage, so that two poles
Pipe D1 is switched on, to further cause the breakdown conducting of zener diode ZD1.At this point, electric current will be flowed from zener diode ZD1
To transistor Q1.For transistor Q1, grid is by high level, and therefore, transistor Q1 is switched on, so that output terminal (V
Output) output low level.Specifically, when D11 opens a way, in order to enable constant-current source I1 to reach scheduled constant current, I1 will
In maximum conducting state.Therefore, the anode voltage of diode D1 will be about the voltage of power supply, in this example about 13V,
The voltage is greater than the PN junction voltage (0.7V) of diode D1, the PN junction of voltage (the about 6V) and triode Q1 of zener diode ZD1
Voltage (0.7V), so as to cause D1 conducting, that is, if
V inputs > VPN(D1)+VzD1+Vbe(Q1),
Then diode D1 is switched on.It should be noted that same principle is also applied for diode D2 and Dn.At this point, two pole of pressure stabilizing
Pipe ZD1 is breakdown, triode Q1 conducting, so that output terminal (V output) is low level.
It should be noted that the description to control module is omitted in attached drawing.Foregoing circuit can also include control module, wherein supervising
The output terminal of slowdown monitoring circuit can be connected with control module, and control module is allowed to become low electricity in response to exporting from high level
It is flat, it determines and open circuit occurs inside illuminating circuit, therefore corresponding indication signal can be provided.
Fig. 5 shows the circuit diagram of the circuit for monitoring illuminating circuit according to another example embodiment of the disclosure.Fig. 5
It is identical as principle shown in Fig. 4, it is only connection type difference.Specifically, as shown in figure 5, the cathode of the zener diode ZD1
It is connected with one of the source S of the transistor Q1 and drain D, anode is connected to the ground.The grid G of the transistor Q1 can be with
The node A is connected, and another in its source S and drain D is connected with output terminal (V output).Implement as shown in Fig. 5
The working principle of example is identical as the working principle of embodiment illustrated in fig. 4, will no longer repeat herein.
In Fig. 4 and circuit shown in fig. 5, multiple illuminating circuits share a set of observation circuit, so that the knot of observation circuit
Structure is simplified, and can significantly reduce cost, thus realize it is a kind of can be come with simple and economic scheme it is right in time
The abnormality of illuminating circuit is detected, effectively prevents the power supply circuit for being used to monitor illuminating circuit on fire.
It should be noted that although describing the one of the application as example using the NPN transistor of high conducting in above description
A example embodiment, however the application can also use the PNP transistor of low conducting.When the positive-negative-positive crystal using low conducting
Guan Shi can be equipped with corresponding accessory power supply.It, can be in addition, other than transistor Q1 is embodied as bipolar transistor
Implement these as other transistors of such as MOSFET.
To sum up, Fig. 4 and Fig. 5 all illustrates a kind of luminescent system.Wherein the luminescent system may include: power supply；It shines
Circuit, including one or more luminous branches, wherein each luminous branch includes one or more luminescent devices and constant-current source, and
It is configured as receiving electric power from power supply to drive one or more of luminescent devices to shine via the constant-current source；And matched
It is set to the observation circuit for monitoring the illuminating circuit.The observation circuit may include one or more link blocks 410,510,
Each of one or more of link blocks 410,510, which have, to be connected with test point M1, M2, Mn in respective branch
First end and the second end being connected with first node A, and be configured as by will test point M1, M2, Mn and first node A it
Between potential difference be compared with threshold voltage, to control the conducting of electric current；And output module 420,520, the output mould
Block 420,520 have with the first node A first end being connected and the second end being connected with output terminal, and be configured as
Output is controlled according to the current potential of first node A.
In addition, being conspired to create a string although LED drive circuit is described as every three LED in the present specification, and every string LED has
There is the LED light emitting device of identical quantity, however the invention is not limited thereto.The observation circuit of example embodiment is not only according to the present invention
It can be applied to the LED drive circuit that every string includes other quantity LED light emitting device, can also be applied to each string has different numbers
The LED of the LED light emitting device (for example, the first string has 3 LED, the second string has 4 LED, and third string has 3 LED) of amount
Driving circuit.It should be noted that when the observation circuit of example embodiment according to the present invention is applied to the LED that each string has different number
When the LED drive circuit of luminescent device, by the burning voltage of zener diode be selected as in the operating voltage on each string most
Big operating voltage is approximately equal.
Moreover, it is noted that although the method according to disclosure example embodiment is individually described in separated form above
Embodiment, however the feature described in each embodiment described above can not depart from the disclosure design the case where
Under be incorporated in single embodiment in any way, and the feature described in single embodiment can also be implemented separately
In multiple embodiments.
Although the disclosure, art technology has shown and described referring to the certain exemplary embodiments of the disclosure
Personnel it should be understood that in the case where the spirit and scope of the present disclosure limited without departing substantially from the following claims and their equivalents,
A variety of changes in form and details can be carried out to the disclosure.Therefore, the scope of the present disclosure should not necessarily be limited by above-described embodiment,
But should be not only determined by appended claims, also it is defined by the equivalent of appended claims.
Claims (10)
1. a kind of for monitoring the circuit of illuminating circuit, the illuminating circuit includes one or more luminous branches, comprising:
One or more link blocks (110,410,510) are every in one or more of link blocks (110,410,510)
One with the first end connected with the test point (M1, M2, Mn) in respective branch and be connected with first node (A) second
End, and be configured as being compared by will test the potential difference between point (M1, M2, Mn) and first node (A) with threshold voltage
Compared with to control the conducting of electric current；And
Output module (120,420,520), the output module (120,420,520) has to be connected with the first node (A)
First end and the second end that is connected with output terminal, and be configured as controlling output according to the current potential of first node (A).
2. circuit according to claim 1, wherein the link block (110,410,510) be configured to respond to it is described
Potential difference is greater than the threshold voltage, and electric current is allowed to flow to the first node (A) from the test point (M1, M2, Mn).
3. circuit according to claim 1, wherein the link block (110,410,510) be embodied as diode (D1,
D2, Dn), wherein the anode of the diode (D1, D2, Dn) is connected with test point (M1, M2, Mn) and cathode and first node
(A) it is connected.
4. circuit according to claim 1, wherein the output module (120,420,520) includes zener diode
(ZD1) and transistor (Q1),
Wherein the cathode of the zener diode (ZD1) is connected with the first node (A), anode and the transistor (Q1)
Grid be connected；And
One of the drain electrode of the transistor (Q1) and source electrode ground connection, and another is connected with the output terminal.
5. circuit according to claim 1, wherein the output module (120,420,520) includes zener diode
(ZD1) and transistor (Q1),
Wherein the cathode of the zener diode (ZD1) is connected with one of the source electrode and drain electrode of the transistor (Q1), anode
It is connected to the ground；And
The grid of the transistor (Q1) is connected with the first node (A), and in its source electrode and drain electrode another with it is described
Output terminal is connected.
6. circuit according to claim 4 or 5, wherein the burning voltage of the zener diode (ZD1) is being equal to branch just
The often voltage of the test point (M1, M2, Mn) when work.
7. circuit according to claim 4 or 5, wherein the transistor (Q1) includes PNP transistor.
8. circuit according to claim 4 or 5, wherein the transistor (Q1) includes NPN transistor.
9. circuit according to claim 1, wherein the circuit further includes resistor (R1), described resistor (R1) one end
It is connected with the first node (A), and its other end and the output module (120,420,520) are connected.
10. a kind of luminescent system, comprising:
Power supply；
Illuminating circuit, including one or more luminous branch, wherein each luminous branch include one or more luminescent devices and
Constant-current source, and be configured as receiving electric power from power supply to drive one or more of luminescent devices to send out via the constant-current source
Light；And
Observation circuit is configured to monitor the illuminating circuit, comprising:
One or more link blocks (110,410,510) are every in one or more of link blocks (110,410,510)
One with the first end connected with the test point (M1, M2, Mn) in respective branch and be connected with first node (A) second
End, and be configured as being compared by will test the potential difference between point (M1, M2, Mn) and first node (A) with threshold voltage
Compared with to control the conducting of electric current；And
Output module (120,420,520), the output module (120,420,520) has to be connected with the first node (A)
First end and the second end that is connected with output terminal, and be configured as controlling output according to the current potential of first node (A).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810407341.9A CN110418452B (en) | 2018-04-28 | 2018-04-28 | Circuit for monitoring a light-emitting circuit |
| PCT/CN2019/084792 WO2019206330A1 (en) | 2018-04-28 | 2019-04-28 | Circuit for monitoring lighting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810407341.9A CN110418452B (en) | 2018-04-28 | 2018-04-28 | Circuit for monitoring a light-emitting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110418452A true CN110418452A (en) | 2019-11-05 |
| CN110418452B CN110418452B (en) | 2022-10-18 |
Family
ID=68293784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810407341.9A Active CN110418452B (en) | 2018-04-28 | 2018-04-28 | Circuit for monitoring a light-emitting circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110418452B (en) |
| WO (1) | WO2019206330A1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101572978A (en) * | 2008-04-29 | 2009-11-04 | 联咏科技股份有限公司 | Light emitting diode driving module |
| CN202275588U (en) * | 2011-09-13 | 2012-06-13 | 深圳市华星光电技术有限公司 | Circuit for compensating LED backlight conduction voltage drop difference |
| CN104349540A (en) * | 2013-08-09 | 2015-02-11 | 意法半导体研发(深圳)有限公司 | Driving device and method for luminous equipment |
| CN105657947A (en) * | 2014-11-27 | 2016-06-08 | 法雷奥照明公司 | Circuit fault detection device, LED luminescence equipment, and light and/or signal emission device |
| CN205584565U (en) * | 2016-04-25 | 2016-09-14 | 上海晨阑光电器件有限公司 | Can driving light between LED day of self -checking |
| CN206077780U (en) * | 2016-10-10 | 2017-04-05 | 武汉通畅汽车电子照明有限公司 | LED protection circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102458005B (en) * | 2010-10-22 | 2013-12-25 | 英飞特电子（杭州）股份有限公司 | Multiplexed output current equalizing circuit for LED (Light Emitting Diode) |
-
2018
- 2018-04-28 CN CN201810407341.9A patent/CN110418452B/en active Active
-
2019
- 2019-04-28 WO PCT/CN2019/084792 patent/WO2019206330A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101572978A (en) * | 2008-04-29 | 2009-11-04 | 联咏科技股份有限公司 | Light emitting diode driving module |
| CN202275588U (en) * | 2011-09-13 | 2012-06-13 | 深圳市华星光电技术有限公司 | Circuit for compensating LED backlight conduction voltage drop difference |
| CN104349540A (en) * | 2013-08-09 | 2015-02-11 | 意法半导体研发(深圳)有限公司 | Driving device and method for luminous equipment |
| CN105657947A (en) * | 2014-11-27 | 2016-06-08 | 法雷奥照明公司 | Circuit fault detection device, LED luminescence equipment, and light and/or signal emission device |
| CN205584565U (en) * | 2016-04-25 | 2016-09-14 | 上海晨阑光电器件有限公司 | Can driving light between LED day of self -checking |
| CN206077780U (en) * | 2016-10-10 | 2017-04-05 | 武汉通畅汽车电子照明有限公司 | LED protection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110418452B (en) | 2022-10-18 |
| WO2019206330A1 (en) | 2019-10-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101789946B1 (en) | Led backlight system and display apparatus | |
| CN103384436B (en) | LED-backlit constant-current circuit | |
| CN103929844A (en) | Automatic control device for lamp cyclic test | |
| CN103401209B (en) | LED-backlit short-circuit protection circuit | |
| JP2013131348A (en) | Led driving device and lighting fixture | |
| CN106409241B (en) | The short-circuit protection method of liquid crystal display device and multi partition LED backlight | |
| CN102213730B (en) | Low-voltage alarm circuit | |
| CN104777394A (en) | Line connection sequence detection circuit | |
| CN103137080B (en) | Light-emitting dioxide (LED) backlight drive circuit, liquid crystal display device and driving method | |
| CN102118904B (en) | LED illuminating system and control method thereof | |
| US20150022120A1 (en) | Light emitting diode apparatus with over current protection function and system having the same | |
| CN103745691A (en) | Backlight drive circuit and liquid crystal display device | |
| CN110418452A (en) | For monitoring the circuit of illuminating circuit | |
| CN109272949B (en) | Backlight driving circuit and driving method of display device and display device | |
| CN105657947A (en) | Circuit fault detection device, LED luminescence equipment, and light and/or signal emission device | |
| CN103851422A (en) | Lighting module used for backlight, backlight and LCD (Liquid Crystal Display) device | |
| CN103200726B (en) | The power supply circuits of the control circuit of LED illumination device and LED illumination device | |
| US20140184098A1 (en) | Automatic input impedance control | |
| CN208986864U (en) | One kind preventing brush motor common conduct circuit | |
| CN203934064U (en) | A kind of multi-channel type LED driving power | |
| CN102750920A (en) | LED (Light emitting diode) backlight driving circuit, backlight module and liquid crystal display device | |
| CN206272215U (en) | A kind of overload protecting circuit | |
| CN101552539B (en) | Inverter gate pulse protection circuit | |
| CN103220857B (en) | A kind of LED constant-current control circuit | |
| CN206260110U (en) | A kind of LED lane change auxiliary lamp modules with overvoltage protection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |