CN206136371U - A kind of LED lamp tube driving circuit - Google Patents

Abstract

The utility model discloses a LED fluorescent tube drive circuit, it includes first rectifier bridge, second rectifier bridge, input circuit, drive and control circuit and removes the ripple circuit, the parallelly connected input of later connecting input circuit of first rectifier bridge and second rectifier bridge, input circuit's output is connected to drive and control circuit's input, and drive and control circuit's output is through removing ripple circuit connection LED fluorescent tube. In this scheme, every input of two rectifier bridges is respectively as a wiring end, in four wiring ends arbitrary two receive the commercial power can the normal power supply, other two the wiring ends that are not connected to the commercial power are electrified, need not distinguish which two wiring ends for a set of, it is more convenient to use to can adapt to the different occasions of both ends power supply and the power supply of first end, the security has also obtained the promotion. This scheme is applicable to all LED light sources.

Description

A kind of LED lamp tube driving circuit

technical field

The utility model relates to an illumination driving circuit, in particular to an LED lamp tube driving circuit with good adaptability.

Background technique

With the development of lighting technology, LED light source has become a new generation of mainstream lighting source due to its advantages of using low-voltage power supply, low energy consumption, strong applicability, high stability, short response time, no pollution to the environment, and multi-color light emission. LED lamp tubes and LED bulb lamps as lighting sources have gradually replaced existing incandescent lamps and fluorescent lamps. Two terminals are respectively arranged on the above-mentioned four terminals, and any two terminals of the above four terminals are short-circuited to form two electrodes. When inputting power supply, the two electrodes can be connected to the mains. However, since there are four terminals on the two lamp holders, it is difficult to distinguish which two ends form an electrode when connecting to the mains, and it is easy to connect the two terminals of the same electrode to both ends of the mains, which has potential safety hazards. . In addition, if any terminal of the two electrodes is energized, the other terminals are charged, which is also unsafe.

Contents of the invention

The utility model mainly solves the technical problems existing in the prior art that it is difficult to distinguish which two terminals form an electrode, and there are potential safety hazards during use, and provides a safe and reliable LED lamp tube drive circuit that does not need to distinguish terminals.

The utility model mainly solves the above-mentioned technical problems through the following technical solutions: an LED lamp tube drive circuit, including a first rectifier bridge, a second rectifier bridge, an input circuit, a drive control circuit and a ripple removal circuit. The input circuit includes a piezoresistor RV, a capacitor C0, a capacitor C1, a capacitor CL2, a resistor RD and an inductor L2; pin 1 of the first rectifier bridge, pin 3 of the first rectifier bridge, pin 1 of the second rectifier bridge and the first pin Any two of the 3 pins of the second rectifier bridge are connected to an external power supply, both pin 4 of the first rectifier bridge and pin 4 of the second rectifier bridge are grounded, and pin 2 of the first rectifier bridge and pin 2 of the second rectifier bridge are both grounded. Connect the first end of the inductor L2, the second end of the inductor L2 is connected to the drive control circuit; the resistor RD is connected in parallel with the inductor L2; the first end of the capacitor C0 is connected to the first end of the inductor L2, and the second end of the capacitor C0 is grounded; the capacitor C1 The first end of the inductor L2 is connected to the second end of the capacitor C1, and the second end of the capacitor C1 is grounded; the varistor RV is connected between pin 2 and pin 4 of the first rectifier bridge; the capacitor CL2 is connected across the pin of the second rectifier bridge Between pin 2 and pin 4; the output end of the drive control circuit is connected to the LED light tube through the ripple removal circuit.

In this scheme, the first rectifier bridge and the second rectifier bridge are connected in parallel, and each input terminal of the two rectifier bridges is used as a terminal, which is connected with the subsequent input circuit, drive control circuit and ripple circuit in turn to drive the LED lamp. Any two of the four terminals can be connected to the mains for normal power supply, and the other two terminals that are not connected to the mains are not charged. It is not necessary to distinguish which two terminals are a group, which is more convenient to use and can It is suitable for different occasions of two-end power supply and first-end power supply, and the safety has also been improved.

Preferably, the drive control circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R9, a resistor Rs1, a resistor Rs2, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C6, a capacitor CE1, and a diode D1 , diode D2, inductor L1 and driver chip U1; the first end of the resistor R1 is connected to the second end of the inductor L2, and the second end of the resistor R1 is connected to pin 3 of the driver chip U1 through the resistor R2; the first end of the resistor R3 Connect the positive pole of diode D2, the second end of resistor R3 is grounded through resistor R4; the negative pole of diode D2 is connected to pin 3 of driver chip U1 through resistor R9; the first end of capacitor C3 is connected to pin 3 of driver chip U1, and the second end is grounded ; Pin 4 of the driver chip U1 is connected to the second end of the resistor R3; pin 2 of the driver chip U1 is grounded; pin 1 of the driver chip U1 is grounded through the capacitor C6; pins 5 and 6 of the driver chip U1 are connected to the second end of the inductor L2 ; Pin 8 of the driver chip U1 is connected to the cathode of the diode D1, the anode of the diode D1 is grounded, the resistor Rs1 and the resistor Rs2 are connected in parallel with the diode D1; the first end of the capacitor C4 is connected to the second end of the inductor L2, and the second end of the capacitor C4 Connect to the ripple removal circuit; the first end of the inductor L1 is connected to the second end of the capacitor C4, the second end of the inductor L1 is grounded, the capacitor CE1, the resistor R5 and the capacitor C2 are connected in parallel with the inductor L1; the anode of the diode D2 is connected to the ripple removal circuit.

The drive control circuit converts the rectified voltage into a voltage suitable for the LED lamp.

Preferably, the de-ripple circuit includes a resistor R6, a resistor R7, a resistor R8, a capacitor C7, a capacitor C8, a capacitor C9 and a de-ripple chip U2; the first end of the resistor R6 is connected to the second end of the capacitor C4, and the second end of the resistor R6 The two ends are connected to pin 8 of the de-ripple chip U2; pin 6 of the de-ripple chip U2 is grounded; pin 7 of the de-ripple chip U2 is grounded through a capacitor C8; pin 2 of the de-ripple chip U2 is grounded through a resistor R8; pin 5 of the de-ripple chip U2 is grounded The pin is grounded through capacitor C9; the first end of capacitor C7 is connected to pin 8 of the de-ripple chip U2, and the second end is grounded; the first end of resistor R7 is connected to pin 1 of the de-ripple chip U2, and the second end is used as the output negative pole; The first terminal of R6 is used as the positive pole of the output terminal, and the positive pole of the output terminal is also connected to the positive pole of the diode D2.

The de-ripple circuit filters out the ripple noise in the current, improves the quality of the output current, and prolongs the service life of the LED lamp.

Preferably, the LED lamp driving circuit further includes a safety resistor RT, and the safety resistor RT is connected in series with pin 1 of the first rectifier bridge and pin 1 of the second rectifier bridge.

The fuse resistor can effectively improve the reliability of the entire driving circuit.

Preferably, the driving chip U1 is JW1130, and the de-ripple chip U2 is JW1723.

The beneficial effect brought by the utility model is that there is no need to distinguish the terminals, any two terminals can be connected to the mains to supply power, it is convenient to use, the terminals not connected to the mains are not charged, the safety is high, and it has good adaptability and reliability.

Description of drawings

Fig. 1 and Fig. 2 are a kind of circuit schematic diagram of the utility model.

detailed description

The technical solutions of the present utility model will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

Embodiment: A kind of LED lamp tube drive circuit of this embodiment, as shown in Figure 1 and Figure 2, comprises a first rectifier bridge, a second rectifier bridge, an input circuit, a drive control circuit, a ripple removal circuit and a safety resistor RT, The input circuit includes a varistor RV, a capacitor C0, a capacitor C1, a capacitor CL2, a resistor RD and an inductor L2; pin 1 of the first rectifier bridge, pin 3 of the first rectifier bridge, pin 1 of the second rectifier bridge Connect any two of the 3 pins of the second rectifier bridge to the external power supply, both the 4 pins of the first rectifier bridge and the 4 pins of the second rectifier bridge are grounded, the 2 pins of the first rectifier bridge and the 2 pins of the second rectifier bridge Both pins are connected to the first end of the inductor L2, and the second end of the inductor L2 is connected to the drive control circuit; the resistor RD is connected in parallel with the inductor L2; the first end of the capacitor C0 is connected to the first end of the inductor L2, and the second end of the capacitor C0 is grounded; The first end of the capacitor C1 is connected to the second end of the inductor L2, and the second end of the capacitor C1 is grounded; the varistor RV is connected between pins 2 and 4 of the first rectifier bridge; the capacitor CL2 is connected across the second rectifier bridge Between pin 2 and pin 4 of the bridge; the output end of the drive control circuit is connected to the LED light tube through the ripple circuit.

The drive control circuit includes resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R9, resistor Rs1, resistor Rs2, capacitor C2, capacitor C3, capacitor C4, capacitor C6, capacitor CE1, diode D1, diode D2, inductor L1 and the driver chip U1; the first end of the resistor R1 is connected to the second end of the inductor L2, and the second end of the resistor R1 is connected to pin 3 of the driver chip U1 through the resistor R2; the first end of the resistor R3 is connected to the anode of the diode D2 , the second end of resistor R3 is grounded through resistor R4; the cathode of diode D2 is connected to pin 3 of driver chip U1 through resistor R9; the first end of capacitor C3 is connected to pin 3 of driver chip U1, and the second end is grounded; Pin 4 is connected to the second end of resistor R3; pin 2 of driver chip U1 is grounded; pin 1 of driver chip U1 is grounded through capacitor C6; pin 5 and pin 6 of driver chip U1 are connected to the second end of inductor L2; pin 5 of driver chip U1 is connected to the second end of inductor L2; Pin 8 is connected to the cathode of diode D1, the anode of diode D1 is grounded, resistor Rs1 and resistor Rs2 are connected in parallel with diode D1; the first end of capacitor C4 is connected to the second end of inductor L2, and the second end of capacitor C4 is connected to the ripple circuit; The first end of the inductor L1 is connected to the second end of the capacitor C4, the second end of the inductor L1 is grounded, the capacitor CE1, the resistor R5 and the capacitor C2 are all connected in parallel with the inductor L1; the anode of the diode D2 is connected to the deripple circuit. The driver chip U1 is JW1130.

The anti-ripple circuit includes resistor R6, resistor R7, resistor R8, capacitor C7, capacitor C8, capacitor C9 and anti-ripple chip U2; the first end of the resistor R6 is connected to the second end of the capacitor C4, and the second end of the resistor R6 is connected to the anti-ripple Pin 8 of the chip U2; pin 6 of the de-ripple chip U2 is grounded; pin 7 of the de-ripple chip U2 is grounded through the capacitor C8; pin 2 of the de-ripple chip U2 is grounded through the resistor R8; pin 5 of the de-ripple chip U2 is grounded through the capacitor C9 ; The first end of the capacitor C7 is connected to pin 8 of the chip U2, and the second end is grounded; the first end of the resistor R7 is connected to pin 1 of the chip U2, and the second end is used as the negative pole of the output terminal; the first end of the resistor R6 As the positive pole of the output terminal, the positive pole of the output terminal is also connected to the positive pole of the diode D2. The deripple chip U2 is JW1723.

The de-ripple circuit filters out the ripple noise in the current, improves the quality of the output current, and prolongs the service life of the LED lamp.

The safety resistor RT is connected in series with pin 1 of the first rectifier bridge and pin 1 of the second rectifier bridge.

The fuse resistor can effectively improve the reliability of the entire drive circuit.

In this scheme, the first rectifier bridge and the second rectifier bridge are connected in parallel, and each input terminal of the two rectifier bridges is used as a terminal, which is connected with the subsequent input circuit, drive control circuit and ripple circuit in turn to drive the LED lamp. Any two of the four terminals can be connected to the mains for normal power supply, and the other two terminals that are not connected to the mains are not charged. It is not necessary to distinguish which two terminals are a group, which is more convenient to use and can It is suitable for different occasions of two-end power supply and first-end power supply, and the safety has also been improved.

The specific embodiments described herein are only to illustrate the inventive spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or replace them in similar ways, but they will not deviate from the principle of the utility model or go beyond the appended claims defined range.

Although terms such as bridge rectifier, varistor, and ripple removal are frequently used in this article, the possibility of using other terms is not excluded. These terms are used only to describe and explain the essence of the utility model more conveniently; interpreting them as any kind of additional limitation is contrary to the creative spirit of the invention.

Claims (4)

1. a kind of LED tube drive circuit, it is characterised in that including the first rectifier bridge, the second rectifier bridge, input circuit, driving Control circuit and ripple current, the input circuit is gone to include varistor RV, electric capacity C0, electric capacity C1, electric capacity CL2, resistance RD With inductance L2；3 feet of 1 foot of first rectifier bridge, 3 feet of the first rectifier bridge, 1 foot of the second rectifier bridge and the second rectifier bridge In any two foot connection external power source, 4 feet of 4 feet and the second rectifier bridge of the first rectifier bridge are all grounded, the first rectifier bridge 2 feet and 2 feet of the second rectifier bridge all connect the first end of inductance L2, the second end connection drive control circuit of inductance L2；Electricity RD is in parallel with inductance L2 for resistance；The first end of electric capacity C0 connects the first end of inductance L2, the second end ground connection of electric capacity C0；Electric capacity C1's First end connects second end of inductance L2, the second end ground connection of electric capacity C1；Varistor RV be connected across the first rectifier bridge 2 feet and Between 4 feet；Electric capacity CL2 is connected across between 2 feet of the second rectifier bridge and 4 feet；The outfan of drive control circuit is by removing ripple Circuit connects LED lamp tube.

2. a kind of LED tube drive circuit according to claim 1, it is characterised in that the drive control circuit includes Resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R9, resistance Rs1, resistance Rs2, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C6, electric capacity CE1, diode D1, diode D2, inductance L1 and driving chip U1；The first end connection of the resistance R1 Second end of inductance L2, second end of resistance R1 connect 3 feet of driving chip U1 by resistance R2；The first end connection of resistance R3 The positive pole of diode D2, second end of resistance R3 are grounded by resistance R4；The negative pole of diode D2 is driven by resistance R9 connections 3 feet of chip U1；The first end of electric capacity C3 connects 3 feet of driving chip U1, the second end ground connection；The 4 feet connection of driving chip U1 Second end of resistance R3；The 2 feet ground connection of driving chip U1；1 foot of driving chip U1 is grounded by electric capacity C6；Driving chip U1's 5 feet and 6 feet connect second end of inductance L2；8 feet of driving chip U1 connect the negative pole of diode D1, and the positive pole of diode D1 connects Ground, resistance Rs1 and resistance Rs2 are all in parallel with diode D1；The first end of electric capacity C4 connects second end of inductance L2, electric capacity C4's Ripple current is removed in the connection of second end；The first end of inductance L1 connects second end of electric capacity C4, the second end ground connection of inductance L1, electric capacity CE1, resistance R5 and electric capacity C2 are in parallel with inductance L1；Ripple current is removed in the positive pole connection of diode D2；The driving chip U1 For JW1130.

3. a kind of LED tube drive circuit according to claim 2, it is characterised in that described to go ripple current to include electricity Hinder R6, resistance R7, resistance R8, electric capacity C7, electric capacity C8, electric capacity C9 and remove ripple chip U2；The first end connection electric capacity of resistance R6 8 feet of ripple chip U2 are removed at second end of C4, the second end connection of resistance R6；6 feet of ripple chip U2 are gone to be grounded；Remove corrugated core 7 feet of piece U2 are grounded by electric capacity C8；2 feet of ripple chip U2 are gone to be grounded by resistance R8；5 feet of ripple chip U2 are gone to pass through Electric capacity C9 is grounded；8 feet of ripple chip U2, the second end ground connection are gone in the first end connection of electric capacity C7；The first end connection of resistance R7 1 foot of ripple chip U2 is removed, the second end is used as negative pole of output end；The first end of resistance R6 is rectified as output head anode, output Pole is also connected with the positive pole of diode D2；It is described to go ripple chip U2 to be JW1723.

4. a kind of LED tube drive circuit according to claim 1 and 2, it is characterised in that also including insurance resistance RT, The insurance resistance RT is serially connected on 1 foot of the first rectifier bridge on 1 foot with the second rectifier bridge.