CN203057655U

CN203057655U - LED lamp driving power supply with low cost and high performance

Info

Publication number: CN203057655U
Application number: CN 201320074829
Authority: CN
Inventors: 张新安
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-02-18
Filing date: 2013-02-18
Publication date: 2013-07-10
Anticipated expiration: 2023-02-18

Abstract

The utility model relates to an LED lamp driving power supply with low cost and high performance. The LED lamp driving power supply consists of an EMI filter circuit, a rectification filter circuit, a PFC circuit and a constant current drive circuit, the connection relationship is as shown in the attached drawing. The EMI filter circuit is a low-pass filter circuit consisting of a capacitor and an inductor. The rectification filter circuit is a commercial power rectification filter circuit consisting of a full-bridge rectifier and a capacitor. The PFC circuit is a valley filling type passive power factor correcting circuit consisting of diodes, capacitors and a resistor. The constant current drive circuit consists of an integrated circuit chip PT4107 and a MOSFET in the periphery of the chip, resistors, a potentiometer, capacitors, an inductor and a diode, can drive a 15W LED lamp, and the system efficiency is higher than 86% when an alternating current input is in the range of 180V to 240V. The LED lamp driving power supply with low cost and high performance has the positive effects of simple circuit, small size, light weight, low cost, high efficiency, good performance, and long service life.

Description

A kind of low-cost and high-performance LED lamp driving power source

Technical field

The utility model relates to LED driving power technical field, is specifically related to a kind of low-cost and high-performance LED lamp driving power source.

Background technology

The LED light fixture has energy-saving and environmental protection, the life-span is long, the response time is short, volume is little, the reliability advantages of higher, and the equal illumination effect is more energy-conservation more than 70% than conventional light source, is acknowledged as lighting source of future generation.But, because the characteristic of LED itself determines, the LED lamp must adopt special-purpose driving power to provide constant current to light work, in order to avoid voltage fluctuation causes electric current to increase and LED is damaged, therefore, must design constant current or constant voltage driving power and fully satisfy the required driving requirement of LED work, thereby bring into play the performance of LED to greatest extent, reduce failure rate.Yet, existing various LED lamp driving power source circuit complexity, the cost height, cost performance is low, has influenced applying of LED lamp.

Summary of the invention

For solving the deficiency of existing LED lamp driving power source, the utility model discloses a kind of low-cost and high-performance LED lamp driving power source.This driving power circuit is simple, volume is little, in light weight, cost is low, efficient is high, performance is good, long service life, can be widely used in low-power LED lamp driving power source field.

For achieving the above object, the utility model adopts following technical scheme: the utility model is made up of the EMI filter circuit, current rectifying and wave filtering circuit, pfc circuit and the constant-current drive circuit that are linked in sequence successively.The low-pass filter circuit that the EMI filter circuit is made up of capacitor C 1 and common mode inductance L1.The commercial power rectification filter circuit that current rectifying and wave filtering circuit is made up of full-bridge rectifier DB1 and smothing filtering capacitor C 2.Pfc circuit is by diode D1, D2, D3, the valley fill type Passive Power factor correcting circuit that capacitor C 3, C4 and resistance R 1 are formed.Constant-current drive circuit is by integrated circuit (IC) chip PT4107 and peripheral MOSFET pipe Q1 thereof, resistance R 2, R3, R4, R5, potentiometer W1, capacitor C 5, C6, inductance L 2, diode D4 forms, can drive the LED lamp of 15W, system effectiveness is designed to 470K Ω greater than 86%, R3 in exchanging input 180V～240V scope, and the frequency of oscillation of power supply is 51KHz.

Good effect of the present utility model is: circuit is simple, volume is little, in light weight, cost is low, efficient is high, performance is good, long service life.

Description of drawings

Fig. 1 is block diagram of the present utility model.

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

As shown in Figure 1, the utility model is made up of the EMI filter circuit, current rectifying and wave filtering circuit, pfc circuit and the constant-current drive circuit that are linked in sequence successively.

As shown in Figure 2.

The EMI filter circuit is by the low-pass filter circuit that capacitor C 1 and common mode inductance L1 form, and the high-frequency electromagnetic that can suppress between mains supply and the constant-current drive circuit disturbs.Wherein C1 is used for suppressing the series mode interference signal, and L1 is used for suppressing common mode interference signal.

The commercial power rectification filter circuit that current rectifying and wave filtering circuit is made up of full-bridge rectifier DB1 and smothing filtering capacitor C 2 obtains direct voltage about 300V with the 220V alternating current of input through rectifying and wave-filtering, is the power supply of constant-current drive circuit and LED lamp.

Pfc circuit is by diode D1, D2, D3, the valley fill type Passive Power factor correcting circuit that capacitor C 3, C4 and resistance R 1 are formed.In each half period of input AC voltage, AC voltage is higher than 1/2 o'clock of AC voltage peak, and diode D1, D3 end, the D2 conducting, C1 and C2 serial connection charge, AC voltage was less than 1/2 o'clock of the AC voltage peak, and D2 ends, D1 and D3 conducting, load discharge is passed through in C1 and C2 parallel connection, the AC input current is trimmed, and the input current angle of flow can be increased to 150 ° from 30 °, is increased to 330 ° from 210 °.R1 has surge buffering and current-limiting function, can improve THD, improves power factor.Adopt this valley fill type Passive Power factor correcting circuit, the line power factor is not less than 0.9, three times and quintuple harmonics electric current be respectively 17% and 15%(be 100% with current first harmonics), meet IEC61000-3-2(2001 fully) standard is to the harmonic current regulation requirement of the following electric lighting of 25W.

Constant-current drive circuit is by integrated circuit (IC) chip PT4107 and peripheral MOSFET pipe Q1 thereof, resistance R 2, R3, R4, R5, potentiometer W1, capacitor C 5, C6, inductance L 2, diode D4 composition.The whole LED lamp driving power source comprises that PT4107 only uses 22 components and parts, circuit is simple, volume is little, in light weight, cost is low.

Under the ac input voltage of 180～240V, the output voltage of LED driving power is 60V, and output current is 250mA, can drive the LED lamp of 15W, and whole system efficient is not less than 86%, and efficient height, performance are good.

The PT4107 4. resistance R on the pin 3 is used for arranging the frequency of oscillation of driving power f, computing formula is:

f?(KHz)≈25000/[?R3?(KΩ)?+22KΩ]

When R3=470K Ω, f≈ 51KHz.

The peak current that the output current of LED driving power flows through Q1 by restriction limits.The PT4107 2. threshold voltage of pin is 0.25V, as long as the pressure drop on the current sense resistance R 5 surpasses 0.25V, Q1 then turn-offs, the L2 discharge, and electric current flows through LED through D4.If ignore the L2 effect of ripple, output current is:

I ₀≈0.25V/R5＝0.25V/1＝250?mA。

Regulate the 3. potentiometer W1(5K Ω on the pin of PT4107), can realize linearity light adjusting.If IC1 6. pin to add a duty ratio be 0%～100% low frequency pwm signal, then can realize the PWM light modulation.

PT4107 5. pin can connect the NTC thermistor of a ground connection, the over-temperature protection thresholding is set.

Claims

1. low-cost and high-performance LED lamp driving power source, it is characterized in that: it is made up of the EMI filter circuit, current rectifying and wave filtering circuit, pfc circuit and the constant-current drive circuit that are linked in sequence successively.

2. a kind of low-cost and high-performance LED lamp driving power source according to claim 1 is characterized in that: the low-pass filter circuit that the EMI filter circuit is made up of capacitor C 1 and common mode inductance L1.

3. a kind of low-cost and high-performance LED lamp driving power source according to claim 1 is characterized in that: the commercial power rectification filter circuit that current rectifying and wave filtering circuit is made up of full-bridge rectifier DB1 and smothing filtering capacitor C 2.

4. a kind of low-cost and high-performance LED lamp driving power source according to claim 1, it is characterized in that: pfc circuit is by diode D1, D2, D3, the valley fill type Passive Power factor correcting circuit that capacitor C 3, C4 and resistance R 1 are formed.

5. a kind of low-cost and high-performance LED lamp driving power source according to claim 1, it is characterized in that: constant-current drive circuit is by integrated circuit (IC) chip PT4107 and peripheral MOSFET pipe Q1 thereof, resistance R 2, R3, R4, R5, potentiometer W1, capacitor C 5, C6, inductance L 2, diode D4 forms, can drive the LED lamp of 15W, system effectiveness is greater than 86% in exchanging input 180V～240V scope.

6. a kind of low-cost and high-performance LED lamp driving power source according to claim 1, it is characterized in that: R3 is designed to 470K Ω, and the frequency of oscillation of driving power is 51KHz.