CN117479385A - Fool-proof circuit for LED driving output wiring - Google Patents
Fool-proof circuit for LED driving output wiring Download PDFInfo
- Publication number
- CN117479385A CN117479385A CN202311693265.XA CN202311693265A CN117479385A CN 117479385 A CN117479385 A CN 117479385A CN 202311693265 A CN202311693265 A CN 202311693265A CN 117479385 A CN117479385 A CN 117479385A
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- Prior art keywords
- resistor
- output
- fool
- operational amplifier
- circuit
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
-
- 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
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention relates to an LED driving output wiring fool-proof circuit which comprises at least one path of driver output circuit and a driver output control circuit corresponding to the driver output circuit, wherein the ground of each path of driver output circuit and the ground of each path of driver output control circuit are all the same ground. Compared with the prior art, the invention has the advantages of fundamentally solving the problem of constant current out of control and the like.
Description
Technical Field
The invention relates to an LED driver, in particular to a fool-proof circuit for LED driving output wiring.
Background
At present, an LED driver usually performs current detection at the negative end of output, but a detection resistor is arranged between the ground (Isense 0) of a constant current control IC inside the driver and the negative end (SGND 0) of the output of the LED driver.
As shown in FIG. 1, when the driver is single-path output, the driver has a dimming function, the dimming part and ICs for controlling constant current control and the like are directly and commonly connected to Isense0, the output negative of the driver is SGND0, when the wiring is constructed, the two negative Isense0 and SGND0 output by the driver are carelessly short-circuited, the constant current detection resistance of the driver is short-circuited, and thus the driver loses the constant current function, the output current is out of control, and the LED lamp beads are extremely damaged.
As shown in FIG. 2, if the driver is a multi-output, if the driver is a common negative output, if the driver is a 2-channel output, VOUT2 and VOUT3 are respectively, the negative terminals are SGND2 and SGND3 respectively, and finally the driver returns to the negative GND of the control, at this time, if VOUT2 and SGND3 are connected to one group of lamp panels, VOUT3 and SGND2 are connected to the other group of lamp panels, so that the two constant currents are out of control, the output currents are out of control, and the lamp panels are damaged.
Therefore, how to fundamentally solve the problem of out-of-control constant current of the driver becomes a technical problem to be solved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the LED driving output wiring fool-proof circuit.
The aim of the invention can be achieved by the following technical scheme:
according to one aspect of the invention, there is provided an LED driving output wiring foolproof circuit, which comprises at least one path of driver output circuit and a driver output control circuit corresponding to the driver output circuit, wherein the ground of each path of driver output circuit and the ground of each path of driver output control circuit are all the same ground.
As an optimal technical scheme, the driver output circuit is provided with two paths, the output positive of the two paths is VOUT2 and VOUT3 respectively, and the output negative of the two paths is SGND.
As an optimal technical scheme, the driver output control circuit is also provided with two paths, and the two paths are grounded by SGND.
As an optimal technical scheme, output current detection ends of the two paths of driver output circuits are Isense2 and Isense3 respectively.
As an optimal technical scheme, a detection resistor R9 is arranged between the Isense2 and the SGND, and a detection resistor R18 is arranged between the Isense3 and the SGND.
As a preferable solution, the driver output control circuit includes a first operational amplifier U1A, a second operational amplifier U1B, a reference voltage Ref2, a resistor R12, a resistor R13, a resistor R17, and a resistor R19, where the reference voltage Ref2 is connected to the positive input terminal of the first operational amplifier U1A, one end of the resistor R12, and one end of the resistor R13, the other end of the resistor R12 is connected to the positive input terminal of the second operational amplifier U1B, one end of the resistor R17, the other end of the resistor R13 is connected to the negative input terminal of the second operational amplifier U1B, one end of the resistor R19, the other end of the resistor R17 is connected to Isense2, and the other end of the resistor R19 is connected to SGND.
As a preferred embodiment, the SGND is connected to the negative input of the first operational amplifier U1A via a resistor R10.
As an optimal technical scheme, the VOUT2 is connected with the output end of the first operational amplifier U1A after sequentially passing through a resistor R5, a resistor R7 and a capacitor C3.
As a preferable solution, the output terminal of the first operational amplifier U1A is connected to the cathode of the diode D2, and the anode of the diode D2 is connected to the power source VCC through the resistor R3.
As a preferable solution, the output terminal of the second operational amplifier U1B is connected to the cathode of the diode D6, and the anode of the diode D6 is connected to the power source VCC through the resistor R3.
Compared with the prior art, the invention has the following advantages:
1) The invention ensures that the output negative terminals are all grounded, thereby fundamentally solving the problem of constant current runaway;
2) The invention ensures that two output grounds are the same ground, so that all short circuits and error connection problems are avoided;
3) The invention has wide application range and can be used for the condition of one-way output and multi-way output.
Drawings
FIG. 1 is a specific circuit diagram of a conventional driver single-pass output circuit;
FIG. 2 is a circuit diagram of a two-way output circuit of a conventional driver;
FIG. 3 is a circuit diagram of a two-way output circuit of the driver according to the present invention;
FIG. 4 is a circuit diagram of a two-way driver output control circuit according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
As shown in fig. 3 and fig. 4, an LED driving output wiring fool-proofing circuit includes at least one path of driver output circuit and a driver output control circuit corresponding to the driver output circuit, where each path of ground of the driver output circuit and each path of ground of the driver output control circuit are all the same ground.
As shown in FIG. 3, the driver output circuit is provided with two paths, the output of the two paths is VOUT2 and VOUT3 respectively, the output of the two paths is SGND, the output current detection ends of the two paths of driver output circuit are Isense2 and Isense3 respectively, thus no opportunity wiring error exists, even if four wires are output, the lamp panels are randomly combined, the lamp panels cannot be physically damaged, and the lamp panels can normally work only by correcting wiring errors. A detection resistor R9 is arranged between the Isense2 and the SGND, and a detection resistor R18 is arranged between the Isense3 and the SGND.
As shown in fig. 4, the driver output control circuit is also provided with two paths, and the two paths are grounded by SGND. The driver output control circuit comprises a first operational amplifier U1A, a second operational amplifier U1B, a reference voltage Ref2, a resistor R12, a resistor R13, a resistor R17 and a resistor R19, wherein the reference voltage Ref2 is respectively connected with the positive input end of the first operational amplifier U1A, one end of the resistor R12 and one end of the resistor R13, the other end of the resistor R12 is respectively connected with the positive input end of the second operational amplifier U1B and one end of the resistor R17, the other end of the resistor R13 is respectively connected with the negative input end of the second operational amplifier U1B and one end of the resistor R19, the other end of the resistor R17 is connected with Isense2, and the other end of the resistor R19 is connected with SGND.
The SGND is connected to the negative input terminal of the first operational amplifier U1A via a resistor R10. VOUT2 is connected to the output terminal of the first operational amplifier U1A after passing through the resistor R5, the resistor R7, and the capacitor C3 in sequence. The output end of the first operational amplifier U1A is connected with the cathode of a diode D2, and the anode of the diode D2 is connected with a power supply VCC through a resistor R3. The output end of the second operational amplifier U1B is connected with the cathode of the diode D6, and the anode of the diode D6 is connected with the power supply VCC through a resistor R3.
The specific principle of the invention is as follows:
all control sections, driver output ground, are the same ground SGND, while the output current sense is Isense2 and Isense3, respectively, with the following principle:
the reference voltages Ref2 and Ref3 in the circuit are 2.5V. The operational amplifier U1A, U A is a constant voltage loop of the LED driver, and respectively controls the maximum voltage output by two paths of the driver.
The constant current loop of the LED driver takes VOUT2 as an example:
the operational amplifier U1B and the driver output negative SGND are grounded, PIN 6 of the operational amplifier U1 divides Ref2 through R13 and R19, and the divided voltage is V1 and is 2.5 times R19/(R13+R19)).
Pin 5 of the operational amplifier U1B divides Ref2 by R12 and R17, and the divided voltage is V2 (the value is 2.5 times R17/(R12+R17)).
When LED driver VOUT2 is not loaded with current, there is no voltage drop across R9, isense2 and SGND are equipotential. When current flows through R9, the voltage drop is generated, so that the Isense2 voltage is reduced, and when the voltage drop reaches V2-V1, the operational amplifier U1B acts to form constant current feedback. The output current is constant as follows: (V2-V1)/R9.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. The LED driving output wiring fool-proof circuit is characterized by comprising at least one path of driver output circuit and a driver output control circuit corresponding to the driver output circuit, wherein the ground of each path of driver output circuit and the ground of each path of driver output control circuit are all the same ground.
2. The LED driving output wiring fool-proof circuit of claim 1, wherein the driver output circuit has two paths, the outputs of the two paths are VOUT2 and VOUT3 respectively, and the outputs of the two paths are both SGND.
3. The LED driving output wiring fool-proofing circuit according to claim 2, wherein said driver output control circuit is also provided with two paths, both of which are grounded at SGND.
4. The LED driving output wiring fool-proofing circuit according to claim 2, wherein the output current detection terminals of two said driver output circuits are Isense2 and Isense3, respectively.
5. The LED driving output wiring fool-proofing circuit according to claim 4, wherein a detection resistor R9 is provided between Isense2 and SGND, and a detection resistor R18 is provided between Isense3 and SGND.
6. The LED driving output wiring fool-proof circuit according to claim 5, wherein the driver output control circuit comprises a first operational amplifier U1A, a second operational amplifier U1B, a reference voltage Ref2, a resistor R12, a resistor R13, a resistor R17 and a resistor R19, wherein the reference voltage Ref2 is connected with the positive input terminal of the first operational amplifier U1A, one end of the resistor R12 and one end of the resistor R13 respectively, the other end of the resistor R12 is connected with the positive input terminal of the second operational amplifier U1B and one end of the resistor R17 respectively, the other end of the resistor R13 is connected with the negative input terminal of the second operational amplifier U1B and one end of the resistor R19 respectively, the other end of the resistor R17 is connected with Isense2, and the other end of the resistor R19 is connected with SGND.
7. The LED driving output wiring fool-proofing circuit according to claim 6, wherein said SGND is connected to the negative input terminal of the first operational amplifier U1A through a resistor R10.
8. The LED driving output connection fool-proofing circuit according to claim 6, wherein VOUT2 is connected to the output terminal of the first operational amplifier U1A after passing through the resistor R5, the resistor R7 and the capacitor C3 in sequence.
9. The LED driving output wiring fool-proofing circuit according to claim 6, wherein the output terminal of said first operational amplifier U1A is connected with the cathode of a diode D2, and the anode of said diode D2 is connected with a power source VCC through a resistor R3.
10. The LED driving output wiring fool-proofing circuit according to claim 6, wherein the output terminal of said second operational amplifier U1B is connected with the cathode of a diode D6, and the anode of said diode D6 is connected with a power source VCC through a resistor R3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311693265.XA CN117479385A (en) | 2023-12-11 | 2023-12-11 | Fool-proof circuit for LED driving output wiring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311693265.XA CN117479385A (en) | 2023-12-11 | 2023-12-11 | Fool-proof circuit for LED driving output wiring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117479385A true CN117479385A (en) | 2024-01-30 |
Family
ID=89625865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311693265.XA Pending CN117479385A (en) | 2023-12-11 | 2023-12-11 | Fool-proof circuit for LED driving output wiring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117479385A (en) |
-
2023
- 2023-12-11 CN CN202311693265.XA patent/CN117479385A/en active Pending
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