LED drive circuit with current ripple suppressor

Abstract

The utility model discloses an LED drive circuit with a current ripple suppressor, which comprises a power supply input unit used for receiving external alternating current, and a rectification filtering module used for filtering the external alternating current received by the power supply input unit and converting the filtered alternating current into direct current. The constant current adjusting module is used for adjusting the current of the converted direct current to a set current, and the voltage transformation unit is used for transforming the voltage of the direct current adjusted to the set current and then transmitting the transformed direct current to the current ripple suppression module. And the current ripple suppression module is used for carrying out current ripple suppression on the transformed direct current and transmitting the direct current subjected to current ripple suppression to an external worker. According to the LED driving circuit, the current ripple suppressor is arranged at the output end connected with the LED lamp, so that current ripples in the LED driving circuit are eliminated or reduced, the flicker and stroboflash phenomena of the LED lamp are reduced, and a more stable lighting effect is provided.

Description

Technical Field

[0001] This utility model relates to the field of LED power supply technology, and in particular to an LED driving circuit with a current ripple suppressor. Background Technology

[0002] LEDs, with their advantages of being environmentally friendly, energy-saving, and having a long lifespan, are considered the lighting source of the 21st century and are now being widely used in various lighting fixtures, replacing traditional light sources. Current ripple refers to the periodic fluctuations in current within a DC power supply. These fluctuations can cause instability in the brightness and color of LED lights, affecting lighting effects and user experience. Utility Model Content

[0003] To address the problem of flickering and strobeing in LEDs caused by existing LED constant current drive circuits, this invention provides an LED drive circuit with a current ripple suppressor. The specific technical solution of this invention is as follows:

[0004] An LED driver circuit with a current ripple suppressor includes: a power input unit, a rectification and filtering module, a constant current adjustment module, a transformer unit, a grounding terminal, and a current ripple suppression module. The current ripple suppression includes a current ripple suppressor. The power input unit receives external AC power. The rectification and filtering module filters the external AC power received by the power input unit and converts the filtered AC power into DC power. The constant current adjustment module adjusts the current of the converted DC power to a set current. The transformer unit transforms the DC power adjusted to the set current and then supplies it to the current ripple suppression module. The current ripple suppression module suppresses the current ripple of the transformed DC power and then supplies the suppressed DC power to external personnel.

[0005] Furthermore, the power input unit includes an AC interface L, an AC interface N, and a fuse F1. The AC interface L is connected to the rectifier and filter module through the fuse F1.

[0006] Further, the rectifier and filter module includes a differential and common-mode integrated inductor L3, a rectifier bridge unit BD1, an adjustable resistor VR1, resistors R1, R2, R3, and R8, capacitors CX1, CBB1, and CBB2, and inductor L2. The input terminal of the differential and common-mode integrated inductor L3 is connected to the power input unit, and the output terminal is connected to the input terminal of the rectifier bridge unit BD1. The output terminals of the rectifier bridge unit BD1 are connected to capacitors CX1. The adjustable resistor VR1 is connected in series between the input terminals of the differential and common-mode integrated inductor L3. After resistors R1 and inductor L2 are connected in parallel, one end is connected to the output terminal of the rectifier bridge unit BD1, and the other end is connected to the constant current adjustment module. After resistors R2, R3, and R8 are connected in parallel, one end is connected to the constant current adjustment module through capacitor CBB1, and the other end is connected to the ground terminal. One end of capacitor CBB2 is connected to inductor L2, and the other end is connected to the ground terminal.

[0007] Furthermore, the constant current adjustment module includes an LED constant current driver chip U1, resistors R4, R5, R6, R7, R10, R16, RS1, RS2, capacitors C1 and CE1, diodes D1 and D2, and inductor L5. Pin 1 of the LED constant current driver chip U1 is connected to the output of the rectifier filter module and the input of the transformer unit T1B via resistor R6. Pin 2 is connected to the ground via resistor R10. Pin 3 is also connected to the ground. Pin 4 is connected to the ground via resistors RS1 and RS2. Pin 5 is connected to the transformer unit T1B via inductor L5. The input terminals are connected, pin 6 is connected to resistor R16 through resistor R5, and pin 8 is connected to resistor R16 through resistor R7; after resistor R16 and capacitor CE1 are connected in parallel, one end is connected to resistor R5 and resistor R7 respectively, and the other end is connected to the output terminal of the rectifier filter module and the input terminal of the transformer unit respectively; diode D1, resistor R4 and capacitor C1 are connected in series between the input terminals of transformer unit T1B; the input terminal of diode D2 is connected to resistor R4 and capacitor C1 respectively, and the output terminal is connected to resistor R7 and resistor R16 respectively.

[0008] Furthermore, the LED constant current driver chip U1 is model BP3286J.

[0009] Furthermore, the current ripple suppression module also includes resistors R15, R17, R18, R19, R20, and R29, capacitors C2, C17, C18, CE2, and CY1, diodes D3 and Z3, and a field-effect transistor Q4; pin 1 of the current ripple suppressor U2 is connected to an external LED via resistor R19, pin 2 is connected to ground, pin 3 is connected to ground via capacitor C18, pin 5 is connected to the gate of the field-effect transistor, and pin 6 is connected to an external LED via resistor R20; resistor R15 and capacitor C2 are connected in series and then in parallel with diode D3; diode D... The input terminal of diode D3 is connected to the output terminal of transformer unit T1B, and the input terminal of diode D3 is connected to the external LED. Capacitors CE2 and C2 are connected in series, with one end connected to the input terminal of diode D3 and the other end connected to pin 1 of current ripple suppressor U2. One end of capacitor CY1 is connected to the input terminal of diode D3 and the other end is connected to the ground terminal. One end of resistor R29 is connected to pin 6 of current ripple suppressor U2 and the other end is connected to the ground terminal. The drain of the field-effect transistor is connected to resistor R20, the source is connected to the ground terminal through resistors R17 and R18 respectively, and the gate is connected to the output terminal of diode Z3. The input terminal of diode Z3 is connected to the ground terminal.

[0010] Furthermore, the current ripple suppressor U2 is model LD6802.

[0011] Compared with the prior art, the present invention has at least the following beneficial effects: The LED driving circuit with current ripple suppressor described in this application eliminates or reduces current ripple in the LED driving circuit by setting a current ripple suppressor at the output terminal connected to the LED lamp, thereby reducing the flickering and strobeing of the LED lamp and providing a more stable lighting effect. Attached Figure Description

[0012] Figure 1 This is a circuit schematic diagram of an embodiment;

[0013] Figure 2 This is a circuit diagram of an embodiment. Detailed Implementation

[0014] The following embodiments illustrate the present invention, but the present invention is not limited to these embodiments. Modifications to the specific implementation of the present invention or equivalent substitutions for some technical features, without departing from the spirit of the present invention, should all be covered within the scope of the technical solution claimed by the present invention.

[0015] As shown in Figure 1 and Figure 2As shown, an LED driver circuit with a current ripple suppressor includes: a power input unit, a rectification and filtering module, a constant current adjustment module, a transformer unit, a grounding terminal, and a current ripple suppression module. The current ripple suppression includes a current ripple suppressor. The power input unit receives external AC power. The rectification and filtering module filters the received AC power and converts it into DC power. The constant current adjustment module adjusts the current of the converted DC power to a set current. The transformer unit transforms the DC power (adjusted to the set current) and supplies it to the current ripple suppression module. The current ripple suppression module suppresses the current ripple in the transformed DC power and supplies it to external personnel. By suppressing current ripple, the LED driver circuit enables lighting equipment to provide more uniform and stable lighting effects, reduce visual fatigue, and improve user experience. Reducing current ripple can extend the lifespan of LED lights and lower the risk of damage caused by frequent switching.

[0016] In one embodiment, the power input unit includes an AC interface L, an AC interface N, and a fuse F1. The AC interface L is connected to the rectifier and filter module through the fuse F1.

[0017] In one embodiment, the rectifier-filter module includes a differential-common-mode integrated inductor L3, a rectifier bridge unit BD1, an adjustable resistor VR1, resistors R1, R2, R3, and R8, capacitors CX1, CBB1, and CBB2, and inductor L2. The input terminal of the differential-common-mode integrated inductor L3 is connected to the power input unit, and the output terminal is connected to the input terminal of the rectifier bridge unit BD1. The output terminals of the rectifier bridge unit BD1 are connected to capacitors CX1. The adjustable resistor VR1 is connected in series between the input terminals of the differential-common-mode integrated inductor L3. After resistors R1 and inductor L2 are connected in parallel, one end is connected to the output terminal of the rectifier bridge unit BD1, and the other end is connected to the constant current adjustment module. After resistors R2, R3, and R8 are connected in parallel, one end is connected to the constant current adjustment module through capacitor CBB1, and the other end is connected to the ground terminal. One end of capacitor CBB2 is connected to inductor L2, and the other end is connected to the ground terminal.

[0018] In one embodiment, the constant current adjustment module includes an LED constant current driver chip U1, resistors R4, R5, R6, R7, R10, R16, RS1, RS2, capacitors C1 and CE1, diodes D1 and D2, and inductor L5. Pin 1 of the LED constant current driver chip U1 is connected to the output of the rectifier filter module and the input of the transformer unit T1B via resistor R6. Pin 2 is connected to the ground via resistor R10. Pin 3 is also connected to the ground. Pin 4 is connected to the ground via resistors RS1 and RS2. Pin 5 is connected to the transformer unit T1B via inductor L5. The input terminals are connected, pin 6 is connected to resistor R16 through resistor R5, and pin 8 is connected to resistor R16 through resistor R7; after resistor R16 and capacitor CE1 are connected in parallel, one end is connected to resistor R5 and resistor R7 respectively, and the other end is connected to the output terminal of the rectifier filter module and the input terminal of the transformer unit respectively; diode D1, resistor R4 and capacitor C1 are connected in series between the input terminals of transformer unit T1B; the input terminal of diode D2 is connected to resistor R4 and capacitor C1 respectively, and the output terminal is connected to resistor R7 and resistor R16 respectively.

[0019] In one embodiment, the LED constant current driver chip U1 is model BP3286J. BP3286J is a high-efficiency, high-P-value LED driver chip supporting SCR dimming. The chip operates in critical continuous inductor current mode, suitable for Buck-Boost LED driver power supplies. The BP3286J chip integrates a 600V power switch internally, employing gate drive and high-voltage power supply, requiring very few external components to achieve excellent constant current characteristics, greatly saving system cost and size. BP3286J has multiple protection functions, including LED open-circuit protection (overvoltage protection), LED short-circuit protection, and chip temperature overheating regulation.

[0020] In one embodiment, the current ripple suppression module further includes resistors R15, R17, R18, R19, R20, and R29; capacitors C2, C17, C18, CE2, and CY1; diodes D3 and Z3; and a field-effect transistor Q4. Pin 1 of the current ripple suppressor U2 is connected to an external LED via resistor R19; pin 2 is connected to ground; pin 3 is connected to ground via capacitor C18; pin 5 is connected to the gate of the field-effect transistor; and pin 6 is connected to an external LED via resistor R20. Resistor R15 and capacitor C2 are connected in series and then in parallel with diode D3. The input terminal of diode D3 is connected to the output terminal of transformer unit T1B, and the input terminal of diode D3 is connected to an external LED. Capacitors CE2 and C2 are connected in series, with one end connected to the input terminal of diode D3 and the other end connected to pin 1 of current ripple suppressor U2. One end of capacitor CY1 is connected to the input terminal of diode D3 and the other end is connected to ground. One end of resistor R29 is connected to pin 6 of current ripple suppressor U2 and the other end is connected to ground. The drain of the field-effect transistor is connected to resistor R20, the source is connected to ground through resistors R17 and R18, and the gate is connected to the output terminal of diode Z3. The input terminal of diode Z3 is connected to ground.

[0021] As one embodiment, the current ripple suppressor U2 is model LD6802.

[0022] The LED driver circuit with current ripple suppressor described in this application eliminates or reduces current ripple in the LED driver circuit by setting a current ripple suppressor at the output terminal connected to the LED lamp, thereby reducing the flickering and strobeing of the LED lamp and providing a more stable lighting effect.

[0023] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. An LED driving circuit having a current ripple suppressor, characterized by, The utility model relates to a kind of LED constant current power supply, including: Power input unit, rectification filter module, constant current adjustment module, voltage transformation unit, ground terminal and current ripple suppression module, the current ripple suppression includes current ripple suppressor; The power input unit is used to receive external alternating current, the rectification filter module is used to filter the external alternating current received by power input unit and convert the filtered alternating current into direct current, the constant current adjustment module is used to adjust the current of converted direct current to set current, the voltage transformation unit is used to deliver the direct current adjusted to set current after voltage transformation to current ripple suppression module, and the current ripple suppression module is used to carry out current ripple suppression to the direct current after voltage transformation and deliver the direct current after current ripple suppression to external worker.

2. The LED driving circuit with current ripple suppressor of claim 1, wherein, The power input unit includes AC interface L, AC interface N and fuse F1, and the AC interface L is connected with the rectification filter module through the fuse F1.

3. The LED driving circuit with current ripple suppressor of claim 2, wherein, The rectification filter module includes differential common mode integrated inductor L3, rectification bridge unit BD1, adjustable resistance VR1, resistance R1, resistance R2, resistance R3, resistance R8, capacitor CX1, capacitor CBB1, capacitor CBB2 and inductor L2;The input end of the differential common mode integrated inductor L3 is connected with the power input unit, and the output end is connected with the input end of the rectification bridge unit BD1;The output end of the rectification bridge unit BD1 is connected with the capacitor CX1 respectively;The adjustable resistance VR1 is connected in series between the input end of the differential common mode integrated inductor L3;The resistance R1 and the inductor L2 are connected in parallel, one end is connected with the output end of the rectification bridge unit BD1, and the other end is connected with the constant current adjustment module;The resistance R2, the resistance R3 and the resistance R8 are connected in parallel, one end is connected with the constant current adjustment module through the capacitor CBB1, and the other end is connected with the ground terminal;One end of the capacitor CBB2 is connected with the inductor L2, and the other end is connected with the ground terminal.

4. The LED driving circuit with current ripple suppressor of claim 3, wherein, The constant current adjustment module includes LED constant current drive chip U1, resistance R4, resistance R5, resistance R6, resistance R7, resistance R10, resistance R16, resistance RS1, resistance RS2, capacitor C1, capacitor CE1, diode D1, diode D2 and inductor L5;Pin 1 of the LED constant current drive chip U1 is connected with the output end of the rectification filter module and the input end of the voltage transformation unit T1B respectively through resistance R6, pin 2 is connected with the ground terminal through resistance R10, pin 3 is connected with the ground terminal, pin 4 is connected with the ground terminal through resistance RS1 and resistance RS2 respectively, pin 5 is connected with the input end of the voltage transformation unit T1B through inductor L5, pin 6 is connected with resistance R16 through resistance R5, and pin 8 is connected with resistance R16 through resistance R7;The resistance R16 and the capacitor CE1 are connected in parallel, one end is connected with resistance R5 and resistance R7 respectively, and the other end is connected with the output end of the rectification filter module and the input end of the voltage transformation unit respectively;The diode D1, the resistance R4 and the capacitor C1 are connected in series between the input end of the voltage transformation unit T1B;The input end of the diode D2 is connected with the resistance R4 and the capacitor C1 respectively, and the output end is connected with resistance R7 and resistance R16 respectively.

5. The LED driving circuit with current ripple suppressor of claim 4, wherein, The model of the LED constant current driving chip U1 is BP3286J.

6. The LED driving circuit with current ripple suppressor of claim 4, wherein, The current ripple suppression module further comprises a resistor R15, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R29, a capacitor C2, a capacitor C17, a capacitor C18, a capacitor CE2, a capacitor CY1, a diode D3, a diode Z3 and a field effect transistor Q4; a pin 1 of the current ripple suppressor U2 is connected with the external LED lamp through the resistor R19, a pin 2 is connected with the ground end, a pin 3 is connected with the ground end through the capacitor C18, a pin 5 is connected with the gate of the field effect transistor, a pin 6 is connected with the external LED lamp through the resistor R20; the resistor R15 is connected in series with the capacitor C2 and is connected in parallel with the diode D3; an input end of the diode D3 is connected with the output end of the transformer unit T1B, and the input end of the diode D3 is connected with the external LED lamp; the capacitor CE2 and the capacitor C2 are connected in series, one end of which is connected with the input end of the diode D3, and the other end is connected with the pin 1 of the current ripple suppressor U2; one end of the capacitor CY1 is connected with the input end of the diode D3, and the other end is connected with the ground end; one end of the resistor R29 is connected with the pin 6 of the current ripple suppressor U2, and the other end is connected with the ground end; the drain of the field effect transistor is connected with the resistor R20, the source is connected with the ground end through the resistor R17 and the resistor R18 respectively, and the gate is connected with the output end of the diode Z3; the input end of the diode Z3 is connected with the ground end.

7. The LED driving circuit with current ripple suppressor of claim 6, wherein, The model of the current ripple suppressor U2 is LD6802.

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