CN109287025B - LED driving circuit capable of inhibiting overload voltage - Google Patents
LED driving circuit capable of inhibiting overload voltage Download PDFInfo
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- CN109287025B CN109287025B CN201810453762.5A CN201810453762A CN109287025B CN 109287025 B CN109287025 B CN 109287025B CN 201810453762 A CN201810453762 A CN 201810453762A CN 109287025 B CN109287025 B CN 109287025B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Dc-Dc Converters (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention relates to an LED driving circuit capable of inhibiting the overhigh no-load voltage, which comprises a voltage conversion module, an LED driving control module and a voltage comparison module, wherein the voltage conversion module comprises a transformer, the LED driving control module comprises an LED driving chip, a first end and a second end of a primary winding of the transformer are respectively connected with the input voltage of a protection circuit and a switch tube drain electrode in the LED driving chip, a first secondary winding of the transformer is connected with the input end of the voltage comparison module, and the output end of the voltage comparison module is connected with the power supply input end of the LED driving chip. According to the invention, the actual value and the theoretical value of the no-load voltage output by the LED lamp are compared and judged through the voltage comparison module connected with the power supply input end of the LED driving chip, so that the on and off of the LED driving chip are determined, the phenomenon that the no-load voltage output by the LED lamp is too high is inhibited, and the no-load voltage output by the LED lamp always works in a safe range value.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to an LED driving circuit capable of inhibiting the overload voltage.
Background
At present, a great part of LED driving power supply adopts flyback operation topology of two windings, and the LED driving power supply operated in the mode outputs no-load voltage, and is extremely easily influenced by the inductance of a transformer or leakage inductance of the transformer, and the output no-load voltage is also increased along with the increase of the inductance of the transformer or the leakage inductance, so that the output electrolytic capacitor is in a roof-falling phenomenon, and the LED driving power supply is in failure.
On the one hand, from the perspective of transformer design, when the transformer is often designed, due to the limited volume space of the lamp, the designed transformer is not suitable to be oversized, which means that the inductance of the designed transformer is larger and the number of required coils is larger, so that leakage inductance of the transformer is increased; on the other hand, from the aspect of mass production of the transformer, after all, the transformer is wound manually, and the winding smoothness of each winding of the transformer is not ensured, so that the coupling property between each layer of coils is poor, and the leakage inductance of the transformer is increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an LED driving circuit capable of inhibiting the over-high no-load voltage.
In order to solve the technical problems, the technical scheme of the invention is as follows:
The utility model provides a can restrain LED drive circuit that no-load voltage is too high, includes voltage transformation module, LED drive control module and voltage comparison module, voltage transformation module includes the transformer, LED drive control module includes LED drive chip, the input voltage of protection circuit and the inside switch tube drain electrode of LED drive chip are connected respectively to the first end and the second end of transformer's primary winding, the first secondary winding of transformer is connected voltage comparison module's input, LED drive chip's power supply input is connected to voltage comparison module's output.
Further, as a preferred technical scheme, the voltage comparison module comprises a voltage rectification module, a voltage division module and a controllable precise voltage stabilizing source, wherein the input end of the voltage rectification module is connected with the first end of a first secondary winding of the transformer, the output end of the voltage rectification module is connected with the reference end of the controllable precise voltage stabilizing source through the voltage division module, and the second end of the first secondary winding, the anode of the controllable precise voltage stabilizing source and the grounding end of the LED driving chip are commonly grounded; and the cathode of the controllable precise voltage stabilizing source is connected with the power supply input end of the LED driving chip.
Further, as a preferable technical scheme, the voltage comparison module further includes a first capacitor, and the first capacitor and the voltage division module are connected in parallel to an output end of the voltage rectification module.
Further, as a preferable technical scheme, the voltage rectifying module comprises a first diode and a first resistor which are connected in series, and the positive electrode of the first diode is connected with the first end of the first secondary winding.
Further, as a preferable technical scheme, the second resistor and the third resistor are connected in series, and the second resistor and the first resistor are connected in series; one end of the first capacitor is connected with a node between the first resistor and the second resistor, and the other end of the first capacitor and the third resistor are commonly connected to the power ground; and a reference end of the controllable precise voltage stabilizing source is connected with a node between the second resistor and the third resistor.
Further, as a preferable technical scheme, the LED driving control module further includes a fifth resistor, and the current monitoring input end of the LED driving chip, which is in conduction with the drain electrode of the switching tube, is grounded through the fifth resistor.
Further, as a preferred technical scheme, the LED driving control module further includes a sixth resistor and a second capacitor connected in series with the input voltage of the protection circuit in sequence, and a node between the sixth resistor and the second capacitor is connected with a power supply input end of the LED driving chip, and the second capacitor after being connected in series is grounded.
Further, as a preferable technical scheme, the voltage conversion module further comprises an RCD snubber circuit and an RC circuit, wherein the RCD snubber circuit is arranged between the primary winding of the transformer and the input voltage of the protection circuit, the first end of the primary winding of the transformer is connected with the output end of the RCD snubber circuit, and the second end of the primary winding of the transformer is connected with the input end of the RCD snubber circuit; the first end of the second secondary winding of the transformer is connected with the positive end output of the protection circuit through an RC circuit, and the second end of the second secondary winding of the transformer is connected with the negative end output of the protection circuit.
Further, as a preferable technical scheme, the voltage conversion module further includes a third capacitor, a positive electrode of the third capacitor is connected to a node between an output end of the RC circuit and an output end of the protection circuit, and a negative electrode of the third capacitor and a second end of the second secondary winding of the transformer are commonly connected to an output end of the negative terminal of the protection circuit and a second power supply ground.
Further, as a preferable technical scheme, the device further comprises a rectifying module, wherein the output end of the rectifying module is connected with the input end of the voltage conversion module, and the rectifying module outputs the input voltage of the protection circuit.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that: according to the invention, the actual value and the theoretical value of the output no-load voltage of the LED lamp are compared and judged through the voltage comparison module connected with the power supply input end of the LED driving chip of the LED driving control module, so that the on and off of the LED driving chip are determined, the phenomenon that the output no-load voltage of the LED lamp is too high is inhibited, the LED lamp output no-load voltage always works in a safety range value with reasonable design, and the phenomenon that the output electrolytic capacitor is topped is prevented.
Drawings
Fig. 1 is a block diagram of the present invention.
Fig. 2 is a circuit configuration diagram of the present invention.
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted; the same or similar reference numerals correspond to the same or similar components; the terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limiting the present patent.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention will be more readily understood by those skilled in the art, thereby more clearly defining the scope of the present invention.
Example 1
An LED driving circuit capable of suppressing an excessive no-load voltage is shown in fig. 1: the LED driving circuit comprises a voltage conversion module 1, an LED driving control module 2, a voltage comparison module 3 and a rectification module 4, wherein the output end of the rectification module 4 is connected with the input end of the voltage conversion module 2, and the rectification module 4 outputs the input voltage of a protection circuit; the voltage conversion module 1 comprises a transformer 12, the LED drive control module 2 comprises an LED drive chip U1, a first end and a second end of a primary winding N1 of the transformer 12 are respectively connected with the input voltage of the protection circuit and a DRAIN DRAIN of a switching tube in the LED drive chip U1, a first secondary winding N3 of the transformer 12 is connected with an input end of the voltage comparison module 3, and an output end of the voltage comparison module 3 is connected with a power supply input end VCC of the LED drive chip U1.
According to the invention, the voltage comparison module 3 connected with the power supply input end VCC of the LED driving chip U1 of the LED driving control module 2 is used for comparing and judging the actual value and the theoretical value of the no-load voltage output by the LED lamp, so that the on and off of the LED driving chip U1 are determined, the phenomenon that the no-load voltage output by the LED lamp is too high is inhibited, the no-load voltage output by the LED lamp always works in a safe range value with reasonable design, and the phenomenon that the output electrolytic capacitor is topped up is prevented.
The voltage comparison module 3 of the present invention is shown in fig. 2: the LED driving circuit comprises a voltage rectifying module 31, a voltage dividing module 32, a controllable precise voltage stabilizing source U1 and a first capacitor C1, wherein the input end of the voltage rectifying module 31 is connected with a first end of a first secondary winding N3 of a transformer 12, the output end of the voltage rectifying module 31 is connected with a reference end R of the controllable precise voltage stabilizing source U1 through the voltage dividing module 32, the first capacitor C1 and the voltage dividing module 32 are connected in parallel with the output end of the voltage rectifying module 31, and a second end of the first secondary winding N3, an anode A of the controllable precise voltage stabilizing source U1 and a grounding end GND of an LED driving chip U1 are commonly connected with a power supply; the cathode K of the controllable precise voltage stabilizing source U1 is connected with the power supply input end VCC of the LED driving chip U1 through a fourth resistor R4. The voltage rectifying module 31 includes a first diode D1 and a first resistor R1 connected in series, where an anode of the first diode D1 is connected to a first end of the first secondary winding N3; the voltage dividing module 32 comprises a second resistor R2 and a third resistor R3 which are connected in series, the second resistor R2 and the first resistor R1 are connected in series, one end of the first capacitor C1 is connected with a node between the first resistor R1 and the second resistor R2, and the other end of the first capacitor C1 and the third resistor R3 are commonly connected to the power ground; the reference end R of the controllable precise voltage stabilizing source U1 is connected with a node between the second resistor R2 and the third resistor R3. Wherein, controllable accurate steady voltage source U1 is TL431 three terminal voltage regulator.
The working principle of the voltage comparison module 3 of the invention is as follows: the input voltage of the protection circuit is rectified by the voltage rectification module 31 and then is charged to the first capacitor C1 after passing through the first secondary winding N3 of the transformer 12, so that a voltage value U1 is generated on the first capacitor C1, then the voltage is divided by the voltage division module 32, the reference end R of the controllable precise voltage-stabilizing source U1 obtains a reference voltage U2, the reference voltage U2 is compared with the reference voltage in the controllable precise voltage-stabilizing source U1, when the no-load voltage of the LED lamp is set to be within a safe range value with reasonable design, the reference voltage U2 is equal to the reference voltage, when the no-load voltage of the output LED lamp is too high, the voltage value U1 generated on the first capacitor C1 is increased, so that the reference voltage U2 is increased, when the reference voltage U2 is larger than the reference voltage, the potential on the cathode of the controllable precise voltage-stabilizing source U1 is pulled to the ground of the first power supply, and meanwhile, the input end of the LED driving chip U1 is pulled down to be smaller than the reference voltage in the LED driving chip U1, the no-load voltage is suppressed, the no-load voltage of the LED lamp is cut off quickly, the no-load voltage is prevented from being output in the safe range of the LED lamp, and the no-load voltage is prevented from being turned off reasonably.
The LED driving control module 2 of the present invention is shown in fig. 2: the LED driving circuit further comprises a fifth resistor R5, a sixth resistor R6 and a second capacitor C2, wherein a current monitoring input end CS which is conducted with a DRAIN DRAIN of the switching tube in the LED driving chip U1 is grounded through the fifth resistor R5, the sixth resistor R6 and the second capacitor C2 are connected in series, the sixth resistor R6 after being connected in series is connected with an input voltage of the protection circuit, the second capacitor C2 is connected with the ground, and a node of the sixth resistor R6 and the second capacitor C2 is connected with a power supply input end VCC of the LED driving chip U1.
The voltage conversion module 1 of the present invention is shown in fig. 2: the power supply circuit further comprises an RCD absorption circuit 11, an RC circuit 13, a third capacitor C3 and a seventh resistor R7, wherein the RCD absorption circuit 11 is arranged between a primary winding N1 of a transformer 12 and the input voltage of the protection circuit, a first end of the primary winding N1 of the transformer 12 is connected with the output end of the RCD absorption circuit 11, a second end of the primary winding N1 of the transformer 12 is connected with the input end of the RCD absorption circuit 11, a first end of a second secondary winding N2 of the transformer 12 is connected with the input end of the RC circuit 13, the output end of the RC circuit 13, the positive electrode of the third capacitor C3 and the first end of the seventh resistor R7 are commonly connected with the positive end output LED+ of the protection circuit, and a second end of a second secondary winding N2 of the transformer 12, the negative electrode of the third capacitor C3 and the second end of the seventh resistor R7 are commonly connected with the negative end output LED-of the protection circuit and the second power supply ground. The third capacitor C3 is a capacitor with polarity, and includes an electrolytic capacitor.
The rectifying module 4 of the present invention is shown in fig. 2: the power supply comprises a rectifier bridge and a fourth capacitor C4, wherein a first input end and a second input end of the rectifier bridge are respectively connected with a zero line N and a live line L of alternating current mains supply, the grounding end of the rectifier bridge is connected with a third power supply ground, and the output end of the rectifier bridge is the output end of a rectifier module; the output end of the rectifier bridge is also connected with a fourth power ground through a fourth capacitor C4; and a fuse is connected between the second input end of the rectifier bridge and the live wire L, so that the safety of the AC mains supply is ensured.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (8)
1. The LED driving circuit capable of inhibiting the overload voltage is characterized by comprising a voltage conversion module, an LED driving control module and a voltage comparison module, wherein the voltage conversion module comprises a transformer, the LED driving control module comprises an LED driving chip, a first end and a second end of a primary winding of the transformer are respectively connected with the input voltage of a protection circuit and a switching tube drain electrode in the LED driving chip, a first secondary winding of the transformer is connected with the input end of the voltage comparison module, and the output end of the voltage comparison module is connected with the power supply input end of the LED driving chip;
The voltage comparison module comprises a voltage rectification module, a voltage division module and a controllable precise voltage stabilizing source, wherein the input end of the voltage rectification module is connected with the first end of a first secondary winding of the transformer, the output end of the voltage rectification module is connected with the reference end of the controllable precise voltage stabilizing source through the voltage division module, and the second end of the first secondary winding, the anode of the controllable precise voltage stabilizing source and the grounding end of the LED driving chip are commonly grounded; the cathode of the controllable precise voltage stabilizing source is connected with the power supply input end of the LED driving chip; the voltage comparison module further comprises a first capacitor, and the first capacitor and the voltage division module are connected in parallel to the output end of the voltage rectification module; the voltage rectifying module comprises a first diode and a first resistor which are connected in series, the voltage dividing module comprises a second resistor and a third resistor which are connected in series, and the second resistor and the first resistor are connected in series; one end of the first capacitor is connected with a node between the first resistor and the second resistor, and the other end of the first capacitor and the third resistor are commonly connected to the power ground; .
2. The LED driving circuit of claim 1, wherein the positive electrode of the first diode is connected to the first end of the first secondary winding.
3. The LED driver circuit of claim 1, wherein the reference terminal of the controllable precision voltage regulator is connected to a node between the second resistor and the third resistor.
4. The LED driving circuit of claim 1, wherein the LED driving control module further comprises a fifth resistor, and the current monitoring input terminal of the LED driving chip connected to the drain of the switching tube is grounded through the fifth resistor.
5. The LED driving circuit of claim 1, wherein the LED driving control module further comprises a sixth resistor and a second capacitor connected in series with the input voltage of the protection circuit, a node between the sixth resistor and the second capacitor being connected to the power supply input terminal of the LED driving chip, and the second capacitor being connected in series to the power supply ground.
6. The LED driving circuit of claim 1, wherein the voltage conversion module further comprises an RCD snubber circuit and an RC circuit, the RCD snubber circuit being disposed between the primary winding of the transformer and the input voltage of the protection circuit, the first end of the primary winding of the transformer being connected to the output of the RCD snubber circuit, the second end of the primary winding of the transformer being connected to the input of the RCD snubber circuit; the first end of the second secondary winding of the transformer is connected with the positive end output of the protection circuit through an RC circuit, and the second end of the second secondary winding of the transformer is connected with the negative end output of the protection circuit.
7. The LED driver circuit of claim 6, wherein the voltage conversion module further comprises a third capacitor, a positive electrode of the third capacitor being connected to a node between an output terminal of the RC circuit and a positive output terminal of the protection circuit, a negative electrode of the third capacitor and a second terminal of the second secondary winding of the transformer being commonly connected to a negative output terminal of the protection circuit and a second power supply ground.
8. The LED driving circuit of claim 1, further comprising a rectifying module, wherein an output of the rectifying module is connected to an input of the voltage conversion module, and wherein the rectifying module outputs an input voltage of the protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810453762.5A CN109287025B (en) | 2018-05-14 | 2018-05-14 | LED driving circuit capable of inhibiting overload voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810453762.5A CN109287025B (en) | 2018-05-14 | 2018-05-14 | LED driving circuit capable of inhibiting overload voltage |
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| Publication Number | Publication Date |
|---|---|
| CN109287025A CN109287025A (en) | 2019-01-29 |
| CN109287025B true CN109287025B (en) | 2024-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810453762.5A Active CN109287025B (en) | 2018-05-14 | 2018-05-14 | LED driving circuit capable of inhibiting overload voltage |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112566343B (en) * | 2020-12-02 | 2023-02-17 | 浙江凯耀照明有限责任公司 | No-load protection circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1871762A (en) * | 2003-07-29 | 2006-11-29 | 雅达电子国际有限公司 | Switching burst method and apparatus for reducing standby power and improving load regulation in a DC-DC converter |
| CN208143543U (en) * | 2018-05-14 | 2018-11-23 | 惠州市西顿工业发展有限公司 | It is a kind of to can inhibit the excessively high LED drive circuit of floating voltage |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734510B (en) * | 2013-12-20 | 2017-05-03 | 比亚迪股份有限公司 | Switch power supply and control chip thereof |
| CN204539566U (en) * | 2015-03-31 | 2015-08-05 | 长治市华光光电科技集团有限公司 | A kind of New LED driving power |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1871762A (en) * | 2003-07-29 | 2006-11-29 | 雅达电子国际有限公司 | Switching burst method and apparatus for reducing standby power and improving load regulation in a DC-DC converter |
| CN208143543U (en) * | 2018-05-14 | 2018-11-23 | 惠州市西顿工业发展有限公司 | It is a kind of to can inhibit the excessively high LED drive circuit of floating voltage |
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| CN109287025A (en) | 2019-01-29 |
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