CN203352880U

CN203352880U - High-performance LED lamp driving power supply

Info

Publication number: CN203352880U
Application number: CN 201320348877
Authority: CN
Inventors: 张新安
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-06-18
Filing date: 2013-06-18
Publication date: 2013-12-18
Anticipated expiration: 2023-06-18

Abstract

A high-performance LED lamp driving power supply is composed of an EMI filter circuit, a rectification filter circuit, a PFC circuit and a constant current drive circuit. The connection relation of the circuits is illustrated in an attached drawing. The EMI filter circuit is a low-pas filter circuit composed of a capacitor and an inductor. The rectification filter circuit is a commercial power rectification filter circuit composed of a full-bridge rectifier and a capacitor. The PFC circuit is a valley-fill type passive power factor correction circuit composed of diodes, capacitors and a resistor. The constant current drive circuit is composed of an integrated circuit chip, an MOSFET tube, resistors, capacitors, an inductor and a diode. The constant-current driving current of the constant current drive circuit is 350mA. The constant current drive circuit can drive ten serially-connected LED lamps each with one-watt power and a 350mA current. The conversion efficiency of the driving power supply is 88.6%. The power factor of the driving power supply is 0.93. The high-performance LED lamp driving power supply has the advantages of simple circuits, small volume, lightness, low cost, high efficiency, good performance and long service lifetime.

Description

A kind of 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 high performance lED lamp driving power source.

Background technology

In recent years, worldwide energy shortage and problem of environmental pollution are more and more serious, and energy-saving and emission-reduction become the common research topic of paying close attention in the whole world.The ratio that developed country's electric consumption on lighting accounts for the generating total amount is about 19%, and China also reaches 10%.Along with economic development, the electric consumption on lighting of China will also can progressively improve, and therefore the research of green energy conservation illumination more and more be come into one's own.Light-emitting diode (light emitting diode, LED) be a kind of solid-state semiconductor device that can be visible ray by electric energy conversion, can directly be converted into light to electricity, compare with fluorescent lamp with traditional incandescent lamp, have that light efficiency is high, power consumption less, the advantage such as the life-span is long, radiationless.But, characteristic decision due to LED itself, the LED lamp must depend on special-purpose driving power provides 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 source fully meets the driving requirement that LED works required, thereby bring into play to greatest extent the performance of LED, reduce failure rate.Yet, existing various LED lamp driving power circuit complexity, cost is high, and cost performance is low, has affected 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 high performance lED lamp driving power source.This driving power circuit is simple, volume is little, lightweight, cost is low, efficiency is high, performance is good, long service life, can be widely used in LED lamp driving power source field.

For achieving the above object, the utility model adopts following technical scheme: the utility model is comprised 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 comprised of capacitor C 1 and common mode inductance L1.The commercial power rectification filter circuit that current rectifying and wave filtering circuit is comprised 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 correction circuit that capacitor C 3, C4 and resistance R 1 form.Constant-current drive circuit is by integrated circuit (IC) chip SN9310, and MOSFET manages Q1, resistance R 2, R3, R4, R _nTC, capacitor C 5, C6, C7, C8, inductance L 2, diode D4 forms.Capacitor C 7 and resistance R 4 are designed to respectively 680P and 0.91 Ω, and the constant current drive current of driving power is 350mA, and can drive 10 power is 1W, the LED lamp that electric current is the 350mA series connection.

Good effect of the present utility model is: circuit is simple, volume is little, lightweight, cost is low, efficiency is high, performance is good, long service life.

The accompanying drawing explanation

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

The commercial power rectification filter circuit that full-bridge rectifier DB1 and smothing filtering capacitor C 2 form, obtain the 220V alternating current of input the direct voltage of 300V left and right through rectifying and wave-filtering, be constant-current drive circuit and the power supply of LED lamp.

Pfc circuit is by diode D1, D2, D3, the valley fill type Passive Power factor correction circuit that capacitor C 3, C4 and resistance R 1 form.Within each half period of AC line voltage distribution, when the AC voltage amplitude higher than its peak value 50% the time, D2 conducting, and the cut-off of D1 and D3 reverse bias, C3 and C4 are recharged with series system.When the AC voltage amplitude be down to its peak value 50% the time below, D2 ends reverse bias, D1 and D3 conducting, C3 and C4 parallel discharge, discharging current flows into load.Having access to of R1 helps level and smooth input current spike, can also improve power factor by the electric current of restriction C3 and C4.When not adding pfc circuit, within the half period of AC line voltage distribution, only 60 ° of the input current angles of flow, power factor is no more than 0.6.Adopt this valley fill type pfc circuit to substitute single electric capacity, the current lead-through angle will be increased to 120 °, power factor reaches more than 0.9,3 times and 5 subharmonic currents are down to respectively below 17% and 15%, total harmonic distortion THD<30%, meet the requirement that Energy Star SSL power factor is greater than 0.9, and meet EN55015B EMI requirement.

Constant-current drive circuit is by integrated circuit (IC) chip SN9310, and MOSFET manages Q1, resistance R 2, R3, R4, R _nTC, capacitor C 5, C6, C7, C8, inductance L 2, diode D4 forms.Whole LED lamp driving power source comprises that SN9310 is only used 22 components and parts, and circuit is simple, and cost is low, and efficiency is high, and performance is good.

SN3910 is a peak current detection voltage-dropping type LED driver, is operated in constant turn-off time pattern.Its allows voltage source scope from 8VDC to 450VDC or 110VAC/220VAC drives high-brightness LED.SN3910 can adjust LED brightness according to pwm signal, and acceptable pwm control signal duty ratio is 0～100%.It also comprises 50～240mV linearity light adjusting input, can be used for the linear adjustment of LED electric current, and output current can reach 1A, has temperature compensation function, is operated in constant turn-off time pattern.SN3910 adopts peak-current mode to control, and this controller, without any need for loop compensation, just can be obtained good output current and regulate.

SN3910 chip operating voltage representative value is 7.2V, and it is to utilize 300V direct current after rectification through resistance R 2 step-downs, and capacitor C 5 filtering, and of obtaining is operating voltage stably, thereby provides condition for the starting of oscillation of chip.Pin TOFF is arranged on the turn-off time of power MOSFET under constant turn-off time pattern.During floating sky, inner setting time 510nS, be the chip internal frequency of oscillation.Pin CS is the current detecting pin, and it is to detect the electric current of MOSFET pipe Q1 by outside inductive reactance R4, determines when to close output.When producing when a pulse is high level, the GATE pin drives the Q1 grid, output current of the upper formation of Q1, output current is inductance L 2 energy storage simultaneously, and charge to C8, when the GATE pin is low level, Q1 closes, and inductance L 2 is by sustained diode 4 and LED electric discharge, thereby guarantee that load LED also has electric current to flow through when the grid low level, and the size of output current depends on the size of inductance L 2 fully.The utility model is designed to respectively 680P and 0.91 Ω by capacitor C 7 and resistance R 4, and the constant current drive current of driving power is 350mA, and can drive 10 power is 1W, the LED lamp that electric current is the 350mA series connection.

To this driving power, adopt the instruments such as digital voltmeter, AC power meter, oscilloscope to be tested.Measure input voltage, electric current, power, output voltage, electric current, power, the efficiency that calculates this driving power is 88.6%.Measure the phase difference of current waveform lagging voltage waveform with oscilloscope, the power factor that calculates this driving power is 0.93.

Claims

1. a high performance lED lamp driving power source, it is characterized in that: it is comprised of EMI filter circuit, current rectifying and wave filtering circuit, pfc circuit and constant-current drive circuit, the input termination electric main power supply of EMI filter circuit, the input of output termination current rectifying and wave filtering circuit; The output of the input current rectifying and wave filtering circuit of pfc circuit, the power input of the output termination constant-current drive circuit of pfc circuit; The output termination LED lamp of constant-current drive circuit; Constant-current drive circuit is by integrated circuit (IC) chip SN9310, and MOSFET manages Q1, resistance R 2, R3, R4, R _nTC, capacitor C 5, C6, C7, C8, inductance L 2, diode D4 forms, R2 connects with C5, and the anodal tie point with R2 mono-end of C5 connects the 8 pin VIN ends of SN9310, the anode of another termination rectifying output circuit of R2, the minus earth of C5, the 1 pin VREF end of the termination SN9310 of R3, the 3 pin LD ends of another termination SN9310, the 3 pin LD ends of the termination SN9310 of C6, other end ground connection, R _nTCthe 3 pin LD ends of one termination SN9310, other end ground connection, the 7 pin TOFF ends of the termination SN9310 of C7, other end ground connection, the 4 pin GND end ground connection of SN9310,2 pin PWMD ends are unsettled not to be connect, the tie point of the end of R4 and the source electrode of Q1 connects the 6 pin CS ends of SN9310, the other end ground connection of R4, the grid of Q1 connects the 5 pin GATE ends of SN9310, and the drain electrode of Q1 connects the positive pole of D4, the positive pole of D4 and the positive pole of C8 connect the anode of rectifying output circuit, the termination Q1 drain electrode of L2, the negative pole of another termination C8, the both positive and negative polarity of LED lamp is connected respectively at the both positive and negative polarity of C8.

2. a kind of high performance lED lamp driving power source according to claim 1, it is characterized in that: capacitor C 7 and resistance R 4 are designed to respectively 680P and 0.91 Ω, the constant current drive current of driving power is 350mA, and can drive 10 power is 1W, the LED lamp that electric current is the 350mA series connection.