LED lamp driving circuit with filtering function

Abstract

The utility model discloses an LED lamp driving circuit with a filtering function, which comprises a power supply input unit used for receiving external alternating current, a first differential and common mode integrated inductor used for filtering the external alternating current received by the power supply input unit, a rectifier bridge unit used for converting the filtered alternating current into direct current, and a second differential and common mode integrated inductor used for filtering the direct current. And the constant current adjusting module is used for adjusting the current of the converted direct current to a set current, and the second differential and common mode integrated inductor is used for filtering the direct current adjusted to the set current and transmitting the filtered direct current to an external LED lamp. According to the LED lamp driving circuit, the differential and common mode integrated inductors are arranged at the external alternating current input end and the internal direct current output end, the input current and the output current are filtered through the differential and common mode integrated inductors, the dual filtering effect is achieved, and the stability and the reliability of the LED lamp driving circuit are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to LED power supply technical field especially relates to a LED lamp drive circuit with filter function. BACKGROUND

[0002] LED is regarded as the 21st century lighting source with the advantages of environmental protection, energy saving, long life and so on, and has begun to replace traditional light source and is applied in various lighting lamps in large quantities. However, due to the characteristics of LED itself, the driving power supply thereof cannot adopt the same power supply as ordinary incandescent lamps, so as to avoid that voltage fluctuation leads to current increase and thus damages LED, and therefore a new power supply must be designed to fully meet the driving requirements required by LED work, so as to maximize the performance of LED and reduce the failure rate. However, the noise of the existing LED constant current drive circuit is large, which affects the normal work of LED lamp. SUMMARY

[0003] In order to solve the problem of large noise of the existing LED constant current drive circuit, the utility model provides a LED lamp drive circuit with filter function. The specific technical scheme of the utility model is as follows:

[0004] A LED lamp drive circuit with filter function, comprising: a power input unit, a rectification filter module, a constant current adjustment module, a ground terminal GND and a power supply filter module, the rectification filter module comprises a first differential common mode integrated inductor and a rectification bridge unit, and the power supply filter module comprises a second differential common mode integrated inductor; the power input unit is used for receiving external alternating current, the first differential common mode integrated inductor is used for filtering the external alternating current received by the power input unit, the rectification bridge unit is used for converting the filtered alternating current into direct current, the constant current adjustment module is used for adjusting the current of the converted direct current to a set current, and the second differential common mode integrated inductor is used for filtering the direct current adjusted to the set current, and the filtered direct current is delivered to an external LED lamp.

[0005] Further, the power input unit comprises an alternating current interface ACL, an alternating current interface ACN and a fuse F1, and the alternating current interface ACL is connected with the first differential common mode integrated inductor through the fuse F1.

[0006] Further, the rectification filter module further comprises an adjustable resistor VR1, an adjustable resistor VR2, a resistor R3, an inductor L1, a capacitor CX1, a capacitor C3 and a capacitor C4, the adjustable resistor VR1 and the capacitor CX1 are connected in parallel and then connected in series between the input ends of the first differential common-mode integrated inductor LF1, and the output ends of the first differential common-mode integrated inductor LF1 are connected with the input ends of the rectifier bridge unit BD1 respectively; one end of the capacitor C3 is connected with the output end of the rectifier bridge unit BD1, and the other end is connected with the ground end GND; the resistor R3 and the inductor L1 are connected in parallel, one end of which is connected with the output end of the rectifier bridge BD1, and the other end is connected with the input end of the constant current adjustment module; the adjustable resistor VR2 and the capacitor C4 are connected in parallel, one end of which is connected with the inductor L1, and the other end is connected with the ground end GND.

[0007] Further, the constant current adjustment module comprises an LED constant current control chip U1, a resistor R5, a resistor R6, a resistor R7, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R14, a resistor R15, a capacitor EC1, a capacitor C5, a capacitor C7, a capacitor C8, a diode D11 and a field effect tube Q1, pin 1 of the LED constant current control chip U1 is connected with the output end of the rectification filter module through the resistor R6 and the resistor R12, pin 2 is connected with the ground end GND, pin 3 is connected with the ground end GND through the capacitor C5, pin 4 is connected with the gate of the field effect tube Q1 through the resistor R5, pin 5 is connected with the source of the field effect tube Q1, and pin 6 is connected with the power supply filter module through the resistor R9 and the resistor R10; the drain of the field effect tube Q is connected with the output end of the rectification filter module, the source is connected with the input end of the power supply filter module, and the gate is connected with pin 5 of the LED constant current control chip U1 through the resistor R7; one end of the capacitor C7 is connected with the drain of the field effect tube Q1, and the other end is connected with the source of the field effect tube Q1; one end of the capacitor EC1 is connected with pin 1 of the LED constant current control chip U1, and the other end is connected with the ground end GND; the resistor R11 and the capacitor C8 are connected in parallel, one end of which is connected with pin 6 of the LED constant current control chip U1, and the other end is connected with the ground end GND; the resistor R14, the resistor R15 and the diode D11 are connected in series, one end of which is connected with pin 1 of the LED constant current control chip U1, and the other end is connected with the power supply filter module.

[0008] Further, the model of the LED constant current control chip U1 is BP2329A.

[0009] Further, the power supply filtering module further comprises a resistor RS1, a resistor RS2, a resistor RS3, a resistor R13, a resistor R16, a capacitor CE1, a capacitor C6, a diode D9, a diode D10, an inductor L2 and an inductor L3, the capacitor CE1 and the resistor R13 are connected in parallel and then connected in series between the input ends of the second differential common mode integrated inductor LF2; the resistor R16 and the capacitor C6 are connected in series and then connected in parallel with the diode D9 and the diode D10, one end of the diode D10 is connected with the input end of the second differential common mode integrated inductor LF2, and the other end is connected with the resistor RS2; the resistor RS1, the resistor RS2 and the resistor RS3 are connected in parallel, one end of which is connected with the constant current adjusting module, and the other end of which is connected with the inductor L2; the inductor L2 and the inductor L3 are connected in parallel, one end of which is connected with the resistor RS2, and the other end of which is connected with the constant current adjusting module and the input end of the second differential common mode integrated inductor LF2 respectively; the output end of the second differential common mode integrated inductor LF2 is connected with the external LED lamp.

[0010] Compared with the prior art, the LED lamp driving circuit has at least the following beneficial effects: the LED lamp driving circuit disclosed in the application is provided with differential common mode integrated inductors at the external alternating current input end and the internal direct current output end, the input current and the output current are filtered through the differential common mode integrated inductors, the double filtering effect is realized, and the stability and reliability of the LED lamp driving circuit are improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a circuit schematic diagram of an embodiment;

[0012] Figure 2 is a circuit diagram of an embodiment. DETAILED DESCRIPTION

[0013] The following embodiments are used to illustrate the present application, but the present application is not limited by these embodiments. The specific implementation of the present application is modified or some technical features are replaced equivalently without departing from the spirit of the present application, and all of them should be covered in the technical scheme range of the present application.

[0014] As shown in FIG. 1 and Figure 2As shown, an LED driver circuit with filtering function includes: a power input unit, a rectification and filtering module, a constant current adjustment module, a ground terminal GND, and a power supply filtering module. The rectification and filtering module includes a first differential and common-mode integrated inductor and a rectifier bridge unit. The power supply filtering module includes a second differential and common-mode integrated inductor. The power input unit is used to receive external AC power. The first differential and common-mode integrated inductor is used to filter the external AC power received by the power input unit. The rectifier bridge unit is used to convert the filtered AC power into DC power. The constant current adjustment module is used to adjust the current of the converted DC power to a set current. The second differential and common-mode integrated inductor is used to filter the DC power adjusted to the set current, and the filtered DC power is then supplied to the external LED light.

[0015] In one embodiment, the power input unit includes an AC interface ACL, an AC interface ACN, and a fuse F1. The AC interface ACL is connected to a first differential and common-mode integrated inductor via the fuse F1.

[0016] In one embodiment, the rectifier filter module further includes adjustable resistors VR1 and VR2, resistor R3, inductor L1, capacitors CX1, C3, and C4. Adjustable resistor VR1 and capacitor CX1 are connected in parallel and then in series between the input terminals of a first differential-common-mode integrated inductor LF1. The output terminals of the first differential-common-mode integrated inductor LF1 are connected to the input terminals of rectifier bridge unit BD1. One end of capacitor C3 is connected to the output terminal of rectifier bridge unit BD1, and the other end is connected to ground GND. Resistor R3 and inductor L1 are connected in parallel, with one end connected to the output terminal of rectifier bridge BD1 and the other end connected to the input terminal of the constant current adjustment module. Adjustable resistor VR2 and capacitor C4 are connected in parallel, with one end connected to inductor L1 and the other end connected to ground GND.

[0017] As one of the embodiments, the constant current adjusting module comprises an LED constant current control chip U1, a resistor R5, a resistor R6, a resistor R7, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R14, a resistor R15, a capacitor EC1, a capacitor C5, a capacitor C7, a capacitor C8, a diode D11 and a field effect tube Q1, a pin 1 of the LED constant current control chip U1 is connected with the output end of the rectification filtering module through the resistor R6 and the resistor R12, a pin 2 is connected with the ground end GND, a pin 3 is connected with the ground end GND through the capacitor C5, a pin 4 is connected with the gate of the field effect tube Q1 through the resistor R5, a pin 5 is connected with the source of the field effect tube Q1, and a pin 6 is connected with the power supply filtering module through the resistor R9 and the resistor R10; the drain of the field effect tube Q is connected with the output end of the rectification filtering module, the source is connected with the input end of the power supply filtering module, and the gate is connected with the pin 5 of the LED constant current control chip U1 through the resistor R7; the capacitor C7 is connected with the drain of the field effect tube Q1, and the other end is connected with the source of the field effect tube Q1; the capacitor EC1 is connected with the pin 1 of the LED constant current control chip U1 at one end, and connected with the ground end GND at the other end; the resistor R11 and the capacitor C8 are connected in parallel, and one end is connected with the pin 6 of the LED constant current control chip U1, and the other end is connected with the ground end GND; the resistor R14, the resistor R15 and the diode D11 are connected in series, and one end is connected with the pin 1 of the LED constant current control chip U1, and the other end is connected with the power supply filtering module.

[0018] As one of the embodiments, the model of the LED constant current control chip U1 is BP2329A.

[0019] As one of the embodiments, the power supply filtering module further comprises a resistor RS1, a resistor RS2, a resistor RS3, a resistor R13, a resistor R16, a capacitor CE1, a capacitor C6, a diode D9, a diode D10, an inductor L2 and an inductor L3, the capacitor CE1 and the resistor R13 are connected in parallel and then connected in series between the input ends of the second differential common mode integrated inductor LF2; the resistor R16 and the capacitor C6 are connected in series and then connected in parallel with the diode D9 and the diode D10, one end of the diode D10 is connected with the input end of the second differential common mode integrated inductor LF2, and the other end is connected with the resistor RS2; the resistor RS1, the resistor RS2 and the resistor RS3 are connected in parallel, one end is connected with the constant current adjusting module, and the other end is connected with the inductor L2; the inductor L2 and the inductor L3 are connected in parallel, one end is connected with the resistor RS2, and the other end is respectively connected with the constant current adjusting module and the input end of the second differential common mode integrated inductor LF2; the output end of the second differential common mode integrated inductor LF2 is connected with the external LED lamp.

[0020] The LED lamp driving circuit described in the application is provided with differential common mode integrated inductors at the external AC input end and the internal DC output end, filters the input current and the output current through the differential common mode integrated inductors, realizes double filtering effect, and improves the stability and reliability of the LED lamp driving circuit.

[0021] The above only describes some embodiments of the present application. For those skilled in the art, without departing from the inventive concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. An LED lamp driving circuit having a filtering function, characterized by, The utility model relates to a power supply input unit, rectification filter module, constant current adjustment module, ground terminal and power supply filter module, the rectification filter module includes first differential common mode integrated inductor and rectification bridge unit, and the power supply filter module includes second differential common mode integrated inductor, the power supply input unit is used to receive external alternating current, the first differential common mode integrated inductor is used to filter the external alternating current received by power supply input unit, the rectification bridge unit is used to convert the alternating current after filtering into direct current, the constant current adjustment module is used to adjust the current of converted direct current to set current, the second differential common mode integrated inductor is used to filter the direct current adjusted to set current, and the direct current after filtering is delivered to external LED lamp. The power supply input unit includes alternating current interface ACL, alternating current interface ACN and fuse F1, and the alternating current interface ACL is connected with the first differential common mode integrated inductor through the fuse F1. The rectification filter module further includes adjustable resistance VR1, adjustable resistance VR2, resistance R3, inductor L1, capacitor CX1, capacitor C3 and capacitor C4, the adjustable resistance VR1 and capacitor CX1 are connected in parallel and then connected in series between the input end of the first differential common mode integrated inductor LF1, and the output end of the first differential common mode integrated inductor LF1 is connected with the input end of the rectification bridge unit BD1 respectively; one end of the capacitor C3 is connected with the output end of the rectification bridge unit BD1, and the other end is connected with the ground terminal GND; the resistance R3 and inductor L1 are connected in parallel, one end is connected with the output end of the rectification bridge BD1, and the other end is connected with the input end of the constant current adjustment module; the adjustable resistance VR2 and capacitor C4 are connected in parallel, one end is connected with the inductor L1, and the other end is connected with the ground terminal GND.

2. The LED lamp driving circuit with filtering function according to claim 1, characterized in that, ​ 3. The LED lamp driving circuit with filtering function according to claim 1, characterized in that, ​ 4. The LED lamp driving circuit with filtering function according to claim 3, characterized in that, The constant current adjusting module comprises an LED constant current control chip U1, a resistor R5, a resistor R6, a resistor R7, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R14, a resistor R15, a capacitor EC1, a capacitor C5, a capacitor C7, a capacitor C8, a diode D11 and a field effect tube Q1, the pin 1 of the LED constant current control chip U1 is connected with the output end of the rectification filtering module through the resistor R6 and the resistor R12, the pin 2 is connected with the ground end GND, the pin 3 is connected with the ground end GND through the capacitor C5, the pin 4 is connected with the gate of the field effect tube Q1 through the resistor R5, the pin 5 is connected with the source of the field effect tube Q1, and the pin 6 is connected with the power supply filtering module through the resistor R9 and the resistor R10; the drain of the field effect tube Q is connected with the output end of the rectification filtering module, the source is connected with the input end of the power supply filtering module, and the gate is connected with the pin 5 of the LED constant current control chip U1 through the resistor R7; the capacitor C7 is connected with the drain of the field effect tube Q1, and the other end is connected with the source of the field effect tube Q1; one end of the capacitor EC1 is connected with the pin 1 of the LED constant current control chip U1, and the other end is connected with the ground end GND; the resistor R11 and the capacitor C8 are connected in parallel, one end of which is connected with the pin 6 of the LED constant current control chip U1, and the other end is connected with the ground end GND; the resistor R14, the resistor R15 and the diode D11 are connected in series, one end of which is connected with the pin 1 of the LED constant current control chip U1, and the other end is connected with the power supply filtering module.

5. The LED lamp driving circuit with filtering function according to claim 4, characterized in that, The model of the LED constant current control chip U1 is BP2329A.

6. The LED lamp driving circuit with filtering function according to claim 4, characterized in that, The power supply filtering module further comprises a resistor RS1, a resistor RS2, a resistor RS3, a resistor R13, a resistor R16, a capacitor CE1, a capacitor C6, a diode D9, a diode D10, an inductor L2 and an inductor L3, the capacitor CE1 and the resistor R13 are connected in parallel and then connected in series between the input ends of the second differential common mode integrated inductor LF2; the resistor R16 and the capacitor C6 are connected in series and then connected in parallel with the diode D9 and the diode D10, one end of the diode D10 is connected with the input end of the second differential common mode integrated inductor LF2, and the other end is connected with the resistor RS2; the resistor RS1, the resistor RS2 and the resistor RS3 are connected in parallel, one end of which is connected with the constant current adjusting module, and the other end is connected with the inductor L2; the inductor L2 and the inductor L3 are connected in parallel, one end of which is connected with the resistor RS2, and the other end is connected with the constant current adjusting module and the input end of the second differential common mode integrated inductor LF2 respectively; the output end of the second differential common mode integrated inductor LF2 is connected with the external LED lamp.

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