CN203301791U

CN203301791U - High-efficiency light-emitting diode (LED) lamp driving power supply

Info

Publication number: CN203301791U
Application number: CN2013203301603U
Authority: CN
Inventors: 张新安
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-06-08
Filing date: 2013-06-08
Publication date: 2013-11-20
Anticipated expiration: 2023-06-08

Abstract

The utility model relates to a high-efficiency LED lamp driving power supply which is composed of an electromagnetic interference (EMI) filter circuit, a rectification and filter circuit, a power factor correction (PFC) circuit and a constant current drive circuit. The EMI filter circuit is a low-pass filter circuit composed of a capacitor and an inductor; the rectification and filter is a commercial power rectifying and filtering circuit composed of a full-bridge rectifier and a capacitor; the PFC circuit is a valley-fill passive PFC circuit composed of diodes, capacitor and a resistor; and the constant current driving circuit is composed of an integrated circuit chip, an MOSFET tube, resistors, capacitors, a switching transformer and diodes, wherein the switching frequency of the constant current driving circuit is 50KHz, the constant driving current is 320mA, 8W LED lamps can be driven, and the transition efficiency of the driving circuit is 86%. The high-efficiency LED lamp driving power supply has the advantages of simple structure, low cost, high efficiency, excellent performance, small volume, low weight and long service life.

Description

A kind of high efficiency LED lamp driving power

Technical field

The utility model relates to LED driving power technical field, is specifically related to a kind of high efficiency LED lamp driving power.

Background technology

The LED lamp is the emerging product of Lighting Industry, compared with fluorescent lamp with traditional incandescent lamp that high, the luminous monochromaticjty of luminous efficiency is good, the life-span is long, radiationless, the plurality of advantages such as energy-conserving and environment-protective, meet the requirement of energy-conserving and environment-protective in country " 12, five " planning, therefore be described as " the 4th generation light source ".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 the LED lamp is damaged, therefore, must design constant current or constant-voltage driving power source and fully meet the required driving requirement of LED lamp work, thereby bring into play to greatest extent the performance of LED lamp, reduce failure rate.Yet existing various LED lamp driving power circuits are complicated, and cost is high, and efficiency 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 efficiency LED lamp driving power.This driving power circuit is simple, cost is low, efficiency is high, performance is good, volume is little, lightweight, 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 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 FN103, and MOSFET manages Q1, resistance R 2～R8, and capacitor C 5～C11, switch transformer T1, diode D4, D5, D6 form.Resistance R 6 and R7 are designed to respectively 100k Ω and 22k Ω, and the output voltage of constant-current drive circuit is 25V, and resistance R 4 and R5 are designed to respectively 100 Ω and 0.75 Ω, and the constant current drive current is 320mA, and switching frequency is 50kHz.

Good effect of the present utility model is: circuit is simple, cost is low, efficiency is high, performance is good, volume is little, lightweight, 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 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 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 constant pressure and flow 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 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 pressure and flow 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 flow 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 approximately 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 Energy Star SSL power factor greater than 0.9 requirement, and meet EN55015B EMI requirement.

Constant-current drive circuit is by integrated circuit (IC) chip FN103, and MOSFET manages Q1, resistance R 2～R8, and capacitor C 5～C11, switch transformer T1, diode D4, D5, D6 form.Whole LED lamp driving power source comprises that FN103 only uses 31 components and parts, and component number is few, and circuit is simple, and cost is low, efficiency is high.

FAN103 is a kind of primary-side regulated (PSR) pulse-width modulation (PWM) controller that Fairchild Semiconductor is released.This controller main feature comprises: the constant pressure and flow that need not secondary feedback circuit is controlled; In order to make stand-by power consumption minimum, distinctive green model provides the unused time modulation with the PWM frequency under linearity reduction underloading environment, when V being detected _COMRDrop to below 2.5V, the green energy conservation mode control module produces signal, makes the PWM frequency from the 50kHz linear decrease to 370Hz; Have under constant voltage mode peak-current mode and control, when the magnitude of voltage of current detecting end surpasses nominal voltage higher limit 0.8V, chip will stop exporting pwm pulse; Adopt the TRUECURRENTTM patented technology, can accurately control electric current; Have overvoltage, overheat protective function.

After switching on power, the high voltage startup end of 8 pin that FAN103 passes through, for start-up capacitance C7 charging, when VDD reached 15V, chip was started working and is produced pulsed drive MOSFET pipe Q1 break-make.Wherein the capacity of start-up capacitance wants enough large, can not be lower than 5V from its magnitude of voltage before auxiliary winding acquisition energy at VDD, otherwise chip will be in the low pressure lock-out state.After chip operation, the high voltage startup end is ineffective.Manage Q1 conduction period at MOSFET, input voltage is added on the armature winding of transformer, at this moment, the induced voltage of secondary winding makes rectifier diode D6 cut-off, load current relies on capacitor C 10 discharges to keep, during this, electric current of primary winding is almost linear the rising, and transformer is storage power as inductance.When MOSFET pipe Q1 cut-off, primary winding current is vanishing immediately, and former stored energy is capacitor C 10 charging and supply load electric currents by secondary winding.Provide the energy by auxiliary winding for chip on the one hand, and will detect the voltage, the current data that obtain and pass to chip FAN103, by inner comparison circuit, thereby produce suitable pwm pulse, make circuit of reversed excitation output constant current.On the other hand, be according to sampled data, judge whether to take safeguard measure.

Because the mean value of the numerical value of output current when stable state and electric current is the same, so can estimate by armature winding peak current and ON time.The primary current signal that the CS end of chip will detect, after processing through blanking circuit, to obtain peak current by peak detection block and pass to the electric current estimation block with sustained diode 6 ON time secondary according to voltage detecting end data gained, can obtain actual output current, then data and set-point be compared.During less than standard value, the PWM pulse frequency will reduce when actual current, increase the energy storage time of switching tube, thereby reach the purpose that increases electric current.Otherwise the PWM frequency will increase.

The utility model is designed to respectively 100k Ω and 22k Ω with resistance R 6 and R7, the output voltage of constant-current drive circuit is 25V, resistance R 4 and R5 are designed to respectively 100 Ω and 0.75 Ω, the constant current drive current is 320mA, switching frequency is 50kHz, all greater than 86%, the outputting current steadily precision is within ± 3% in AC90V～AC260V full voltage range internal power factor and efficiency.

Claims

1. high efficiency LED lamp driving power, it is characterized in that: it 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.

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

3. a kind of high efficiency LED lamp driving power according to claim 1, is characterized in that: 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.

4. a kind of high efficiency LED lamp driving power according to claim 1, it is characterized in that: 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.

5. a kind of high efficiency LED lamp driving power according to claim 1, it is characterized in that: constant-current drive circuit is by integrated circuit (IC) chip FN103, and MOSFET manages Q1, resistance R 2～R8, capacitor C 5～C11, switch transformer T1, diode D4, D5, D6 form.

6. a kind of high efficiency LED lamp driving power according to claim 5, it is characterized in that: resistance R 6 and R7 are designed to respectively 100k Ω and 22k Ω, the output voltage of constant-current drive circuit is 25V, resistance R 4 and R5 are designed to respectively 100 Ω and 0.75 Ω, the constant current drive current is 320mA, and switching frequency is 50kHz.