CN202524616U - An off-line constant current high-power LED energy-saving lamp driver - Google Patents

Abstract

The utility model relates to an off-line constant current driver for high-power LED energy-saving lamp, effectively solving the problems of narrow wide-voltage adaptation range, imperfect protection function, vulnerability to the influence of power network fluctuations, and high production cost of the conventional drivers. The technical scheme of the driver is that, a housing and a circuit in the housing are included, and the circuit is designed in a manner that, an alternating-current power supply passes through an electromagnetic interference filter composed of a capacitor C1 and mutual inductors L1-1 and L1-2, a bridge direct-current rectifier circuit composed of diodes D1, D2, D3 and D4, a switching power supply chip IC1, a precision feedback circuit composed of a resistor R2, a resistor R3, a photoelectric coupler IC2, and a feedback integration chip IC3, a three-terminal voltage regulator IC4 and an output LED formwork U0. The off-line constant current driver is advantageous in that, the structure is simple and unique, the conversion efficiency is high, the circuit is simply and flexibly designed with high integration, the operation is convenient and the cost is low, thereby being suitable for applications in the field of light emitting device driver and providing good social and economic benefits.

Description

An off-line constant current high-power LED energy-saving lamp driver

technical field

The utility model relates to a light source driver, in particular to an off-line constant-current high-power LED energy-saving lamp driver. the

Background technique

In recent years, people pay more and more attention to low carbon, energy saving and environmental protection. Compared with traditional light sources, LED has the characteristics of energy saving, environmental protection, long service life and short response time. It is an efficient green lighting source that meets environmental protection requirements. , is an ideal substitute for the traditional light source in the future. At present, the high-power white LED on the market is used as the driver of the illuminant to adapt to a wide voltage range and a narrow range. The cost is high. Due to the above-mentioned shortcomings, the performance of high-power LED lighting cannot meet the needs of the market, and high-performance products are expensive and difficult to promote. the

Contents of the invention

In view of the above situation, in order to overcome the defects of the prior art, the purpose of this utility model is to provide an off-line constant-current high-power LED energy-saving lamp driver, which can effectively solve the problem that the existing driver adapts to a wide voltage range and has a weak protection function. It is greatly affected by the fluctuation of the power grid and the production cost is high. the

The technical solution is to include the housing and the circuit inside the housing. The circuit includes a switching power supply chip IC1, a photocoupler IC2 and a transformer T. The AC85-265V power supply is connected to the capacitor C1, and the two ends of the capacitor C1 are respectively connected to the mutual induction coil L1- 1, L1-2, the mutual induction coil L1-1 is respectively connected to the positive pole of the diode D1 and the negative pole of the diode D3, the mutual induction coil L1-2 is respectively connected to the positive pole of the diode D2 and the negative pole of the diode D4, and the negative pole of the diode D1 is connected to the negative pole of the diode D2, One end of capacitor C2, one end of resistor R1, one end of diode VD1 are connected to pin 1 of transformer T, the positive pole of diode D3 and the positive pole of diode D4 are connected to the other end of capacitor C2, the S pin and F pin of switching power supply chip IC1, and one end of capacitor C8 1. One end of capacitor C4 and pin 3 of transformer T are connected via capacitor C7 to pin 1 of integrated chip IC3 and one end of adjustable resistor R _W. The other end of resistor R1 is connected to pin M of switching power supply chip IC1. Diode VD1 The diode VD2 is connected in series with the pin 2 of the transformer T and the D pin of the switching power chip IC1, the C pin of the switching power chip IC1 is connected with the 2 pin of the photocoupler IC2, and one end of the resistor R6, and the resistor R6 is connected in series with the capacitor C8, and the transformer T Pin 4 of the diode D6 is connected to the other end of the capacitor C4 and pin 1 of the photocoupler IC2, pin 3 of the photocoupler IC2 is connected to pin 2 of the feedback integrated chip IC3, one end of the capacitor C6, and one end of the resistor R3, and Connect one end of resistor R5 through capacitor C6, pin 3 of feedback integrated chip IC3, the other end of adjustable resistor _RW , one end of resistor R4 is connected to the positive pole of LED template _U0 , and the other end of resistor R4 is connected to three-terminal regulator IC4 Pin 3 of capacitor C5, one end of capacitor C5, the other end of bias resistor R3, the other end of resistor R5, pin 5 of transformer T is connected to one end of capacitor C3, the other end of capacitor C5, pin 2 of three-terminal regulator IC4, The negative pole of the LED template _U0 , the 6-pin of the transformer T are connected to the other end of the capacitor C3, one end of the resistor R2 and the 1-pin of the three-terminal regulator IC4 through the diode D5, and the other end of the resistor R2 is connected to the 4-pin of the photocoupler IC2.

The utility model has simple and unique structure, high conversion efficiency, simple and flexible circuit design, high degree of integration, convenient use and low cost, can be widely used in the field of lighting drivers, and has good social and economic benefits. the

Description of drawings

Fig. 1 is the circuit diagram of the utility model. the

Detailed ways

The specific embodiments of the present utility model will be described in further detail below in conjunction with the accompanying drawings. the

Given by Fig. 1, the utility model includes a housing and a circuit in the housing, the circuit includes a switching power supply chip IC1, a photocoupler IC2 and a transformer T, the AC85-265V power supply is connected to a capacitor C1, and the two ends of the capacitor C1 are respectively connected to a mutual inductance coil L1-1, L1-2, the mutual induction coil L1-1 is respectively connected to the positive pole of the diode D1 and the negative pole of the diode D3, the mutual induction coil L1-2 is respectively connected to the positive pole of the diode D2 and the negative pole of the diode D4, and the negative pole of the diode D1 is connected to the negative pole of the diode D2 Connection, one end of capacitor C2, one end of resistor R1, one end of diode VD1 are connected to pin 1 of transformer T, the positive pole of diode D3 and the positive pole of diode D4 are connected to the other end of capacitor C2, S pin and F pin of switching power supply chip IC1, capacitor C8 One end of capacitor C4, one end of capacitor C4 and pin 3 of transformer T are connected to pin 1 of feedback integrated chip IC3 and one end of adjustable resistor R _W through capacitor C7, and the other end of resistor R1 is connected to pin M of switching power supply chip IC1. Diode VD1 and diode VD2 are connected in series to pin 2 of transformer T and pin D of switching power chip IC1, pin C of switching power chip IC1 is connected to pin 2 of photocoupler IC2 and one end of resistor R6, resistor R6 is connected in series with capacitor C8, Pin 4 of transformer T is connected to the other end of capacitor C4 and pin 1 of photocoupler IC2 via diode D6, pin 3 of photocoupler IC2 is connected to pin 2 of feedback integrated chip IC3, one end of capacitor C6, and one end of resistor R3 , and connect one end of resistor R5 via capacitor C6, pin 3 of feedback integrated chip IC3, and the other end of adjustable resistor _RW , one end of resistor R4 is connected to the positive pole of LED template _U0 , and the other end of resistor R4 is connected to the three-terminal regulator Pin 3 of transformer IC4, one end of capacitor C5, the other end of bias resistor R3, and the other end of resistor R5, and pin 5 of transformer T is connected to one end of capacitor C3, the other end of capacitor C5, and 2 pins of three-terminal regulator IC4 pin, negative pole of LED template _U0 , pin 6 of transformer T is connected to the other end of capacitor C3, one end of resistor R2 and pin 1 of three-terminal regulator IC4 through diode D5, and the other end of resistor R2 is connected to pin 4 of photocoupler IC2 foot.

The capacitor C1, mutual inductance coils L1-1, L1-2 form an electromagnetic interference filter, its input terminal is connected to an AC85-265V power supply, and its output terminal is connected to a bridge-type DC rectification input terminal composed of diodes D1, D2, D3, and D4 , Diodes D1 and D2 are FR106, and diodes D3 and D4 are 1N4007. the

The resistor R2, the resistor R3, the photocoupler IC2 and the feedback integrated chip IC3 form a precision feedback circuit, the photocoupler IC2 adopts PC817, and the feedback integrated chip IC3 adopts TL431. the

The capacitor C6, the bypass capacitor C8 and the resistor R6 constitute a loop compensation circuit. the

There are two three-terminal voltage regulators IC4, which form a parallel current expansion structure, and IC4 adopts LM7815. the

The switching power supply chip IC1 adopts TOPswitch-Fx chip. the

When the utility model is used, the AC input passes through the electromagnetic interference filter composed of capacitor C1, mutual inductance coil L1-1, L1-2 to suppress the electromagnetic interference and clutter signals of the power grid, and then enters the rectifier diodes D1, D2, D3, D4 for Rectification and filtering, so that the rectification bridge is formed to effectively reduce the conduction noise below 500KHz, and then the current flows from pin 1 of the transformer T to pin 2, and enters the drain of the D terminal of the switching power supply chip IC1. The drain clamp protection circuit is composed of diode VD1 and VD2 constitutes, when the D terminal voltage exceeds the clamping voltage, VD1 and VD2 are turned on, which protects the D terminal drain of the switching power supply chip IC1 from being broken down. In addition, the rectified current is stepped down by the resistor R1, and the current flows into the switch. The M terminal of the power chip IC1 detects the input voltage to realize overvoltage and undervoltage protection. When the power is cut off, the undervoltage detection can prevent the power supply from automatically restarting after the output is out of balance, and can also prevent the interference caused by the slow discharge of the filter capacitor. When the grid is connected instantly, the chip is forced to shut down when there is a peak voltage, so as to avoid damage to the electrical equipment. After the current passes through the transformer T, the secondary 6-pin output is rectified by the Schottky diode D5, filtered by the capacitor C3, and then enters the 1-pin of the three-terminal voltage regulator IC4, and the 3-pin output is filtered by the capacitor C5, and the current is limited by the resistor R4, and the output LED positive terminal of the module. The output of pin 4 of the feedback winding is rectified by D6 and filtered by C4 to provide bias voltage for the collector of pin 1 of the photocoupler IC2, R2 is the current limiting resistor in the photocoupler IC2, R3 is the bias resistor of the feedback integrated chip IC3, so that It has a suitable working current, and the output voltage _U0 is divided by resistors R4 and R5 to obtain a sampling voltage, which is compared with the 2.5V reference voltage in the feedback integrated chip IC3 to generate an error voltage, and then the output current is changed by the photocoupler IC2 , at this time, the current flows into the C terminal of the switching power supply chip IC1, and the duty ratio changes when the duty ratio changes, and then U ₀ is adjusted to remain unchanged. The automatic restart frequency, C7 is the isolation capacitor between the input ground and the output ground.

The utility model has simple and unique structure, high conversion efficiency, simple and flexible circuit design, high degree of integration, convenient use and low cost, can be widely used in the field of lighting drivers, and has good social and economic benefits. the

Claims (5)

1. An off-line constant current high-power LED energy-saving lamp driver, including a housing and a circuit in the housing, characterized in that the circuit includes a switching power supply chip IC1, a photocoupler IC2 and a transformer T, and the AC85-265V power supply is connected to a capacitor C1 , the two ends of the capacitor C1 are respectively connected to the mutual induction coil L1-1, L1-2, the mutual induction coil L1-1 is respectively connected to the positive pole of the diode D1 and the negative pole of the diode D3, and the mutual induction coil L1-2 is respectively connected to the positive pole of the diode D2 and the negative pole of the diode D4, The cathode of diode D1 is connected to the cathode of diode D2, one end of capacitor C2, one end of resistor R1, one end of diode VD1 are connected to pin 1 of transformer T, the anode of diode D3 and the anode of diode D4 are connected to the other end of capacitor C2, switching power supply chip IC1’s S pin, F pin, one end of capacitor C8, one end of capacitor C4 and transformer T’s pin 3, and connect feedback integrated chip IC3’s pin 1 and one end of adjustable resistor R _W through capacitor C7, and the other end of resistor R1 It is connected with the M pin of the switching power chip IC1, the diode VD1 and the diode VD2 are connected in series with the 2 pin of the transformer T and the D pin of the switching power chip IC1, the C pin of the switching power chip IC1 is connected with the 2 pin of the photocoupler IC2, and the resistor R6 One end is connected, the resistor R6 is connected in series with the capacitor C8, the 4th pin of the transformer T is connected with the other end of the capacitor C4 and the 1st pin of the photocoupler IC2 through the diode D6, the 3rd pin of the photocoupler IC2 is connected with the 2nd pin of the feedback integrated chip IC3, Connect one end of capacitor C6 to one end of resistor R3, and connect one end of resistor R5 via capacitor C6, pin 3 of feedback integrated chip IC3, the other end of adjustable resistor _RW , and one end of resistor R4 to the positive pole of LED template _U0 . The other end of resistor R4 is connected to pin 3 of three-terminal regulator IC4, one end of capacitor C5, the other end of bias resistor R3, and the other end of resistor R5, and pin 5 of transformer T is connected to one end of capacitor C3 and the other end of capacitor C5. One end, pin 2 of three-terminal voltage regulator IC4, negative pole of LED template _U0 , pin 6 of transformer T connected to the other end of capacitor C3, one end of resistor R2 and pin 1 of three-terminal voltage regulator IC4, resistor The other end of R2 is connected to pin 4 of photocoupler IC2. 2. The off-line constant-current high-power LED energy-saving lamp driver according to claim 1, wherein the capacitor C1, mutual inductance coils L1-1, L1-2 form an electromagnetic interference filter, and its input terminal is connected to AC85 -265V power supply, the output terminal is connected to the bridge type DC rectification input terminal composed of diodes D1, D2, D3 and D4. 3. The off-line constant-current high-power LED energy-saving lamp driver according to claim 1, wherein said resistor R2, resistor R3, photocoupler IC2, and feedback integrated chip IC3 constitute a precision feedback circuit. 4. The off-line constant-current high-power LED energy-saving lamp driver according to claim 1, wherein said capacitor C6, bypass capacitor C8 and resistor R6 form a loop compensation circuit. 5. The off-line constant-current high-power LED energy-saving lamp driver according to claim 1, wherein there are two three-terminal voltage regulators IC4, forming a parallel current expansion structure.

Images