CN219718538U - Circuit for inhibiting LED ripple current and lamp - Google Patents
Circuit for inhibiting LED ripple current and lamp Download PDFInfo
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- CN219718538U CN219718538U CN202320533617.4U CN202320533617U CN219718538U CN 219718538 U CN219718538 U CN 219718538U CN 202320533617 U CN202320533617 U CN 202320533617U CN 219718538 U CN219718538 U CN 219718538U
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- 230000002401 inhibitory effect Effects 0.000 title abstract description 9
- 239000003990 capacitor Substances 0.000 claims abstract description 27
- 230000002441 reversible effect Effects 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims description 11
- 230000002829 reductive effect Effects 0.000 abstract description 6
- 230000002265 prevention Effects 0.000 abstract 1
- 208000003464 asthenopia Diseases 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
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Abstract
The utility model discloses a circuit for inhibiting LED ripple current and a lamp, wherein the circuit for inhibiting the LED ripple current comprises a power interface, a power supply circuit and a lamp, wherein the power interface comprises a power supply positive end and a power supply negative end; the reverse connection preventing module is respectively connected with the positive electrode end and the negative electrode end of the power supply; the control module comprises a control chip, a first diode, a first capacitor, a first resistor and a first MOS tube, wherein the positive end of the first diode is connected with the reverse connection prevention module, the negative end of the first diode is connected with the VDD end of the control chip, one end of the first capacitor is connected with the VDD end of the control chip, the RVD end of the control chip is connected with the drain electrode of the first MOS tube, the DRV end of the control chip is connected with the grid electrode of the first MOS tube, the CS end of the control chip is connected with the source electrode of the first MOS tube, and the first resistor is connected between the CS end of the control chip and the DRV end of the control chip; and the LED module is connected with the drain electrode of the first MOS tube, so that ripple current in the circuit is effectively reduced, and driving voltage is reduced.
Description
Technical Field
The utility model relates to the field of LED circuits, in particular to a circuit for inhibiting LED ripple current and a lamp.
Background
In the existing LED (Light Emitting Diode ) circuit, in order to meet the requirements of power factor and cost, an LED driving circuit is generally implemented by a single-stage PFC (Power Factor Correction ) circuit. However, when the circuit is driven, the ripple wave is generated to cause high-frequency flicker, and visual fatigue of a user is easily caused. In addition, the circuits also comprise MOS tubes and driving chips, but the starting voltages required by the MOS tubes and the driving chips are high, so that the circuits cannot be started under the condition of low voltage.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a circuit for inhibiting the ripple current of the LED, which can effectively reduce the ripple current in the circuit, so that the circuit can work normally under the condition of low voltage.
The utility model also provides a lamp with the circuit for inhibiting the LED ripple current.
According to an embodiment of the first aspect of the utility model, a circuit for suppressing LED ripple current, a power interface, the power interface comprising a power positive terminal and a power negative terminal; the reverse connection preventing module is respectively connected with the positive end of the power supply and the negative end of the power supply; the control module comprises a control chip, a first diode, a first capacitor, a first resistor and a first MOS tube, wherein the positive electrode end of the first diode is connected with the anti-reverse connection module, the negative electrode end of the first diode is connected with the VDD end of the control chip, one end of the first capacitor is connected with the VDD end of the control chip, the other end of the first capacitor is connected with the negative electrode end of the power supply, the RVD end of the control chip is connected with the drain electrode of the first MOS tube, the DRV end of the control chip is connected with the grid electrode of the first MOS tube, the CS end of the control chip is connected with the source electrode of the first MOS tube, and the first resistor is connected between the CS end of the control chip and the DRV end of the control chip; and the drain electrode of the first MOS tube is connected with the LED module.
The circuit for inhibiting the LED ripple current has at least the following beneficial effects: the reverse connection preventing module is respectively connected with the positive end and the negative end of the power supply, when the power supply is correctly connected with the positive end and the negative end of the power supply, the power supply normally supplies power to the load circuit, otherwise, the reverse connection preventing module disconnects the load circuit, the circuit is protected, and the circuit is prevented from being burnt. The RVD end of the control chip is connected with the drain electrode of the first MOS tube, the DRV end of the control chip is connected with the grid electrode of the first MOS tube, the CS end of the control chip is connected with the source electrode of the first MOS tube, the control chip drives the first MOS tube to inhibit ripple current, and the LED module is prevented from generating stroboflash due to the ripple current, so that visual fatigue of a user is avoided. The first resistor is arranged between the CS end of the control chip and the DRV end of the control chip, and the starting voltage required by the grid electrode of the first MOS tube Q1 is reduced through the first resistor, so that the circuit is prevented from being unable to be started under the condition of low voltage. The first diode is arranged at the VDD end of the control chip, so that the control chip is prevented from being burnt out due to the fact that the starting voltage of the front end is high.
According to some embodiments of the utility model, the control module further comprises a resistor module, a first end of the resistor module is connected with the RVD end of the control chip, and a second end of the resistor module is connected with the drain electrode of the first MOS transistor.
According to some embodiments of the utility model, the control module further comprises a second capacitor, one end of the second capacitor is connected with the CAP end of the control chip, and the other end of the second capacitor is connected with the negative end of the power supply.
According to some embodiments of the utility model, the LED module includes an input terminal connected to the anti-reverse module and an output terminal connected to the drain of the first MOS transistor.
According to some embodiments of the utility model, the control module further comprises a second resistor, one end of the second resistor is connected with the CS end of the control chip, and the other end of the second resistor is connected with the negative end of the power supply.
According to some embodiments of the utility model, the control module further comprises a third resistor connected in parallel with the second resistor.
According to some embodiments of the utility model, the reverse connection preventing module comprises a second MOS transistor, a fourth resistor and a fifth resistor, wherein a drain electrode of the second MOS transistor is connected with the control module, a gate electrode of the second MOS transistor is connected with the negative electrode end of the power supply, a source electrode of the second MOS transistor is connected with the positive electrode end of the power supply, a first end of the fourth resistor is connected with the gate electrode of the second MOS transistor, a second end of the fourth resistor is connected with the negative electrode end of the power supply, a first end of the fifth resistor is connected with a connection point between the first end of the fourth resistor and the gate electrode of the second MOS transistor, and a second end of the fifth resistor is connected with the positive electrode end of the power supply.
According to some embodiments of the utility model, the control module further comprises a third capacitor and a sixth resistor, the third capacitor and the sixth resistor are connected in parallel to form a filtering branch, one end of the filtering branch is connected with the drain electrode of the second MOS transistor, and the other end of the filtering branch is connected with the negative end of the power supply.
According to some embodiments of the utility model, a drain electrode of the second MOS transistor is connected to an anode terminal of the first diode.
According to a second aspect of the utility model, a lamp comprises the circuit for suppressing the ripple current of the LED.
The lamp provided by the embodiment of the utility model has at least the following beneficial effects: the circuit for inhibiting the LED ripple current comprises the anti-reverse connection module, wherein the anti-reverse connection module is respectively connected with the positive end and the negative end of the power supply, and when the power supply is correctly connected into the positive end and the negative end of the power supply, the power supply normally supplies power to the load circuit, otherwise, the anti-reverse connection module disconnects the load circuit, so that the circuit is protected, and the circuit is prevented from being burnt. The RVD end of the control chip is connected with the drain electrode of the first MOS tube, the DRV end of the control chip is connected with the grid electrode of the first MOS tube, the CS end of the control chip is connected with the source electrode of the first MOS tube, the control chip drives the first MOS tube to inhibit ripple current, and the LED module is prevented from generating stroboflash due to the ripple current, so that visual fatigue of a user is avoided. The first resistor is arranged between the CS end of the control chip and the DRV end of the control chip, and the starting voltage required by the grid electrode of the first MOS tube Q1 is reduced through the first resistor, so that the circuit is prevented from being unable to be started under the condition of low voltage. The first diode is arranged at the VDD end of the control chip, so that the control chip is prevented from being burnt out due to the fact that the starting voltage of the front end is high.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The utility model is further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic diagram of a circuit for suppressing LED ripple current according to an embodiment of the present utility model.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
Referring to fig. 1, fig. 1 is a schematic diagram of a circuit for suppressing an LED ripple current according to an embodiment of the present utility model, where the circuit for suppressing an LED ripple current includes a power interface, an anti-reverse connection module 100, a control module 200, and an LED module 300, the power interface includes a power positive terminal and a power negative terminal, the anti-reverse connection module 100 is respectively connected to the power positive terminal and the power negative terminal, and when the power is correctly connected to the power positive terminal and the power negative terminal, the power normally supplies power to a load circuit, and otherwise, the anti-reverse connection module disconnects the load circuit to protect the circuit from burning. The control module 200 includes a control chip U1, a first diode D1, a first resistor R1 and a first MOS transistor Q1, where the positive terminal of the first diode D1 is connected to the anti-reverse connection module 100, the negative terminal of the first diode D1 is connected to the VDD terminal of the control chip U1, the power supply voltage enters the control chip U1 through the first diode D1 after passing through the anti-reverse connection module 100, one end of the first capacitor C1 is connected to the VDD terminal of the control chip U1, the other end of the first capacitor C1 is connected to the negative terminal of the power supply, the RVD terminal of the control chip U1 is connected to the drain electrode of the first MOS transistor Q1, the DRV terminal of the control chip U1 is connected to the gate electrode of the first MOS transistor Q1, and the CS terminal of the control chip U1 is connected to the source electrode of the first MOS transistor Q1, so as to drive the first MOS transistor Q1 to inhibit the ripple current, thereby avoiding the LED module 300 from generating strobe light. The first resistor R1 is arranged between the CS end of the control chip U1 and the DRV end of the control chip U1, so that the grid starting voltage of the first MOS tube Q1 is reduced, and the first MOS tube Q1 can work normally under the condition of low voltage. The LED module 300 is connected to the drain of the first MOS transistor Q1, and is configured to drive the LED module 300.
When the negative electrode of the power supply is grounded, the other end of the first capacitor C1 is grounded.
It should be noted that, during the operation of the circuit, the control chip U1 and the first MOS transistor Q1 keep the current stable, so that the current of the LED is also constant, thereby reducing the current ripple on the LED.
It should be noted that, the RVD end of the control chip U1 is a short-circuit protection detection pin, and the voltage of the drain electrode of the first MOS transistor Q1 is detected by being connected with the drain electrode of the first MOS transistor Q1, when the voltage of the drain electrode of the first MOS transistor Q1 reaches a preset protection voltage, the control chip U1 is turned off, and the circuit is stopped, so that the circuit is prevented from being damaged by the excessive voltage. The DRV end of the control chip U1 is a driving pin and works by being connected with a driving circuit through a grid electrode of the first MOS tube Q1. The CS end of the control chip U1 is a current detection pin, and is connected with the source electrode of the first MOS tube Q1 to detect the current of the circuit.
It should be noted that, in the related technical scheme, the MOS tube and the driving chip are adopted to inhibit the ripple of the circuit, the driving voltage required by the MOS tube is 15 volts, and when the driving voltage is lower than 15 volts, the MOS tube can not be started, so that the circuit can not work normally. The grid electrode of the MOS tube is connected with the resistor in parallel, so that the driving voltage of the MOS tube is reduced, and the MOS tube can work normally when the driving voltage is lower than 15V.
It can be understood that the control module 200 further includes a resistor module, a first end of the resistor module is connected to the RVD end of the control chip U1, a second end of the resistor module is connected to the drain electrode of the first MOS transistor Q1, and the resistor module is composed of a seventh resistor R2 and an eighth resistor R3.
It should be noted that, in another embodiment, the resistance module may be an adjustable resistor, and a user may adjust the resistance value of the resistance module according to an actual use situation.
It is understood that the control module 200 further includes a second capacitor C2, one end of the second capacitor C2 is connected to the CAP end of the control chip U1, and the other end of the second capacitor C2 is connected to the negative end of the power supply.
It should be noted that, when the negative electrode of the power supply is grounded, the other end of the second capacitor C2 is grounded.
It can be understood that the control module 200 further includes a second resistor R4, one end of the second resistor R4 is connected to the CS end of the control chip U1, the other end of the second resistor R4 is connected to the negative end of the power supply, the maximum on current in the circuit, that is, the protection current, can be changed by changing the resistance value of the second resistor R4, and when the circuit in the circuit is greater than the maximum on current, the control chip U1 controls the circuit to stop working, so as to avoid the influence of the circuit in the circuit on the service life of the circuit.
When the negative electrode of the power supply is grounded, the other end of the second resistor R4 is grounded.
It is understood that the control module 200 further includes a third resistor R5, and the maximum on-current in the circuit is more easily adjusted by the parallel connection of the second resistor R4 and the third resistor R5.
It can be appreciated that the anti-reverse connection module 100 includes a second MOS transistor Q2, a fourth resistor R6, and a fifth resistor R7, where a drain of the second MOS transistor Q2 is connected to the control module 200, a gate of the second MOS transistor Q2 is connected to a negative terminal of the power supply, a source of the second MOS transistor Q2 is connected to a positive terminal of the power supply, a first end of the fourth resistor R6 is connected to the gate of the second MOS transistor Q2, a second end of the fourth resistor R6 is connected to a negative terminal of the power supply, a first end of the fifth resistor R7 is connected to a connection point between the first end of the fourth resistor R6 and the gate of the second MOS transistor Q2, and a second end of the fifth resistor R7 is connected to a positive terminal of the power supply, so that reverse connection is prevented by the second MOS transistor Q2, loss and heat generated by using a diode as the anti-reverse connection in the related art are avoided, and reliability of the circuit of the utility model is improved.
When the negative electrode of the power supply is grounded, the second electrode of the fourth resistor R6 is grounded.
It can be understood that the control module 200 further includes a third capacitor C3 and a sixth resistor R8, where the third capacitor C3 and the sixth resistor R8 are connected in parallel to form a filtering branch, one end of the filtering branch is connected to the drain of the second MOS transistor Q2, the other end of the filtering branch is connected to the negative end of the power supply, and the current is filtered by the filtering branch.
It should be noted that, when the negative electrode of the power supply is grounded, the other end of the filtering branch is grounded.
It can be understood that the VSS terminal of the control chip U1 is connected to the drain of the second MOS transistor Q2 and the anode terminal of the first diode D1.
It is understood that the LED module 300 includes an output end and an input end, the output end is connected to the drain electrode of the second MOS transistor Q2, and the output end is connected to the drain electrode of the first MOS transistor Q1.
It should be noted that, the LED module 300 is formed by connecting a plurality of LED lamps in series, the positive electrode end of the LED lamp is connected with the input end, and the negative electrode end of the LED lamp is connected with the output end.
It should be noted that, in another embodiment, the LED module 300 composed of a plurality of LED lamps has a driving voltage not greater than 15 v.
It will be appreciated by those skilled in the art that the specific values of the above circuit components may be determined according to actual requirements and are not limited herein.
The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.
Claims (10)
1. A circuit for suppressing LED ripple current, comprising:
a power interface comprising a power positive terminal and a power negative terminal;
the reverse connection preventing module is respectively connected with the positive end of the power supply and the negative end of the power supply;
the control module comprises a control chip, a first diode, a first capacitor, a first resistor and a first MOS tube, wherein the positive electrode end of the first diode is connected with the anti-reverse connection module, the negative electrode end of the first diode is connected with the VDD end of the control chip, one end of the first capacitor is connected with the VDD end of the control chip, the other end of the first capacitor is connected with the negative electrode end of the power supply, the RVD end of the control chip is connected with the drain electrode of the first MOS tube, the DRV end of the control chip is connected with the grid electrode of the first MOS tube, the CS end of the control chip is connected with the source electrode of the first MOS tube, and the first resistor is connected between the CS end of the control chip and the DRV end of the control chip;
and the drain electrode of the first MOS tube is connected with the LED module.
2. The circuit of claim 1, wherein the control module further comprises a resistor module, a first end of the resistor module is connected to the RVD end of the control chip, and a second end of the resistor module is connected to the drain of the first MOS transistor.
3. The circuit of claim 1, wherein the control module further comprises a second capacitor, one end of the second capacitor is connected to the CAP end of the control chip, and the other end of the second capacitor is connected to the negative end of the power supply.
4. The circuit of claim 1, wherein the LED module comprises an input terminal and an output terminal, the input terminal is connected to the anti-reverse module, and the output terminal is connected to the drain of the first MOS transistor.
5. The circuit of claim 1, wherein the control module further comprises a second resistor, one end of the second resistor is connected to the CS terminal of the control chip, and the other end of the second resistor is connected to the negative terminal of the power supply.
6. The circuit of claim 5, wherein the control module further comprises a third resistor, the third resistor being in parallel with the second resistor.
7. The circuit for suppressing an LED ripple current according to claim 1, wherein the anti-reverse connection module comprises a second MOS transistor, a fourth resistor and a fifth resistor, wherein a drain electrode of the second MOS transistor is connected to the control module, a gate electrode of the second MOS transistor is connected to the negative terminal of the power supply, a source electrode of the second MOS transistor is connected to the positive terminal of the power supply, a first end of the fourth resistor is connected to the gate electrode of the second MOS transistor, a second end of the fourth resistor is connected to the negative terminal of the power supply, a first end of the fifth resistor is connected to a connection point between the first end of the fourth resistor and the gate electrode of the second MOS transistor, and a second end of the fifth resistor is connected to the positive terminal of the power supply.
8. The circuit of claim 7, wherein the control module further comprises a third capacitor and a sixth resistor, the third capacitor and the sixth resistor are connected in parallel to form a filtering branch, one end of the filtering branch is connected with the drain electrode of the second MOS transistor, and the other end of the filtering branch is connected with the negative end of the power supply.
9. The circuit of claim 7, wherein the drain of the second MOS transistor is connected to the positive terminal of the first diode.
10. A luminaire comprising a circuit as claimed in any one of claims 1 to 9 for suppressing LED ripple current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320533617.4U CN219718538U (en) | 2023-03-17 | 2023-03-17 | Circuit for inhibiting LED ripple current and lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320533617.4U CN219718538U (en) | 2023-03-17 | 2023-03-17 | Circuit for inhibiting LED ripple current and lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219718538U true CN219718538U (en) | 2023-09-19 |
Family
ID=87976888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320533617.4U Active CN219718538U (en) | 2023-03-17 | 2023-03-17 | Circuit for inhibiting LED ripple current and lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219718538U (en) |
-
2023
- 2023-03-17 CN CN202320533617.4U patent/CN219718538U/en active Active
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