CN203632933U - LED lamp driving power supply using numerical control chip - Google Patents

LED lamp driving power supply using numerical control chip Download PDF

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Publication number
CN203632933U
CN203632933U CN201320803140.3U CN201320803140U CN203632933U CN 203632933 U CN203632933 U CN 203632933U CN 201320803140 U CN201320803140 U CN 201320803140U CN 203632933 U CN203632933 U CN 203632933U
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circuit
output
driving power
numerical control
control chip
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Expired - Fee Related
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CN201320803140.3U
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Chinese (zh)
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张新安
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Abstract

Provided is an LED lamp driving power supply using a numerical control chip. The LED lamp driving power supply is composed of an EMI filter circuit, a commercial power rectification filter circuit, a PFC correction circuit, a numerical control chip iW3620, a MOS switching tube, a switch transformer, an output voltage sampling circuit, an output current sampling circuit, and a high-frequency rectification filter circuit the connected relation of which is described in the figure. The numerical control chip iW3620 is a high-performance AC/DC offline LED driver using digital control technology, employs primary side control technology, and may achieve constant current control without a secondary feedback circuit, thereby greatly decreasing system volume and system cost. The driving power supply has 40V output voltage and 300mA output current, and has multiple protective functions of overvoltage protection, overcurrent protection, peak value current restriction, short circuit protection of a current sampling resistor, and chip overtemperature protection. The driving power supply has beneficial effects of simple circuit, small size, light weight, low cost, high efficiency, complete protective functions, and a long service life.

Description

A kind of LED lamp driving power source that adopts numerical control chip
Technical field
The utility model relates to LED driving power technical field, is specifically related to a kind of LED lamp driving power source that adopts numerical control chip.
Background technology
LED is a kind of injection type electroluminescence semiconductor device, DC driven, and super low-power consumption, electric light power conversion efficiency approaches 100%, and equal illumination effect is more energy-conservation more than 70% than conventional light source.Solid cold light source, epoxy encapsulation, useful life was up to 50,000 to 100,000 hours, longer more than 10 times than the conventional light source life-span.In addition, LED lamp is a kind of green light source, there is no ultraviolet ray and infrared ray in spectrum, and heat is low, without stroboscopic, radiationless, therefore, is described as " the 4th generation light source ".LED technical development is rapid, and the luminous efficiency of white light LEDs has broken through 100lm/W now.But the bright number of output light stream of LED lamp and electric current and the temperature of wavelength and PN junction are closely related, conventional drive circuit, as switch voltage-stabilizing circuit, will cause the premature aging of LED lamp, can not effectively meet the requirement that the illumination of LED lamp drives.Therefore, LED lamp must provide constant electric current to light work by design specialized driving power, fully meets the required driving requirement of LED lamp work, in order to avoid electric current increases, LED lamp is damaged, thereby brings into play to greatest extent the performance of LED lamp, reduces failure rate.But existing various LED lamp driving power source costs are high, 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 LED lamp driving power source that adopts numerical control chip.This driving power circuit is simple, volume is little, lightweight, cost is low, efficiency is high, defencive function is perfect, and 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 made up of EMI filter circuit, commercial power rectification filter circuit, PFC correcting circuit, numerical control chip iW3620, MOS switching tube, switch transformer, output voltage sample circuit, output current sample circuit and rectifier filter circuit.The input termination electric main power supply of EMI filter circuit, the input of output termination commercial power rectification filter circuit; The output of the input commercial power rectification filter circuit of pfc circuit, 1 end of the T1 armature winding N1 of output termination switch transformer, the drain electrode of the 2 termination MOS switching tube Q1 of armature winding N1; 5 ends of the output voltage sampling winding N3 of the input termination switch transformer T1 of output voltage sample circuit, the 2 pin INV ends of output termination numerical control chip iW3620; The source electrode of the input termination MOS switching tube Q1 of output current sample circuit, output connects the 6 pin INI ends of numerical control chip iW3620 through resistance R 8; The grid of MOS switching tube Q1 connects the 7 pin GATE ends of integrated circuit (IC) chip iW3620 through resistance R 7; 3 ends of the output winding N2 of the input termination switch transformer T1 of rectifier filter circuit, output termination LED lamp.The sample resistance R2 of output voltage sample circuit and R3 are designed to respectively 33K Ω and 4.7K Ω, and the output voltage of driving power is 40V.The sample resistance R8 of output current sample circuit is designed to 2.2 Ω, and the output current of driving power is 300mA.
Good effect of the present utility model is: circuit is simple, volume is little, lightweight, cost is low, efficiency is high, defencive function is perfect, long service life.
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 made up of EMI filter circuit, commercial power rectification filter circuit, PFC correcting circuit, numerical control chip iW3620, MOS switching tube, switch transformer, output voltage sample circuit, output current sample circuit and rectifier filter circuit.
As shown in Figure 2.
The low-pass filter circuit that EMI filter circuit is made up of capacitor C 1 and common mode inductance L1, the high-frequency electromagnetic that can suppress between driving power and mains supply disturbs.Wherein C1 is used for suppressing series mode interference signal, and L1 is used for suppressing common mode interference signal.
The bridge rectifier filter circuit that commercial power rectification filter circuit is made up of bridge rectifier BDR1 and capacitor C 2.To 85~264V line voltage rectifying and wave-filtering of input, be driving power power supply by the direct voltage obtaining.
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 voltage, when the amplitude of AC voltage higher than its peak value 50% time, D2 conducting, D1 and D3 cut-off, C3 and C4 are charged with series system.When the amplitude of AC voltage be down to its peak value 50% time below, D2 cut-off, D1 and D3 conducting, C3 and C4 parallel discharge.R1 can limit the peak current of C3 and C4, also contributes to improve power factor by level and smooth input current spike.While not adding pfc circuit, within the half period of AC voltage, only 60 ° of the input current angles of flow, power factor is no more than 0.6.Adopt this valley fill type pfc circuit, current lead-through angle is increased to 120 °, and power factor reaches more than 0.9, and 3 times and 5 subharmonic currents are down to respectively below 17% and 15%, total harmonic distortion THD<30%, meets the requirement that Energy Star SSL power factor is greater than 0.9.
Output voltage sample circuit is made up of resistance R 2 and R3, and output current sample circuit is made up of resistance R 8, R9 and capacitor C 8, and rectifier filter circuit is made up of diode D6 and capacitor C 10.
The input termination electric main power supply of EMI filter circuit, the input of output termination commercial power rectification filter circuit; The output of the input commercial power rectification filter circuit of pfc circuit, 1 end of the T1 armature winding N1 of output termination switch transformer, the drain electrode of the 2 termination MOS switching tube Q1 of armature winding N1; 5 ends of the output voltage sampling winding N3 of the input termination switch transformer T1 of output voltage sample circuit, the 2 pin INV ends of output termination numerical control chip iW3620; The source electrode of the input termination MOS switching tube Q1 of output current sample circuit, output connects the 6 pin INI ends of numerical control chip iW3620 through resistance R 8; The grid of MOS switching tube Q1 connects the 7 pin GATE ends of integrated circuit (IC) chip iW3620 through resistance R 7; 3 ends of the output winding N2 of the input termination switch transformer TI of rectifier filter circuit, output termination LED lamp.
The iW3620 that the utility model uses is the high-performance AC/DC off-line type LED driver of a employing digital control technology.Adopt primary side control technology, can realize constant current control without secondary feedback circuit and compensating circuit, can greatly reduce system bulk and save system cost.IW3620 full load is operated in PWM pattern, is operated in PFM pattern when underloading, and inside compensates system loop by digital error amplifier, does not need additional any compensating element.IW3620 has output overvoltage, overcurrent protection, peak current limit, the multi-protective functions such as current sampling resistor short-circuit protection, chip overheat protector.
The startup that resistance R 5 is iW3620 and input voltage sensing resistor, capacitor C 5 is for the high-frequency noise on filtering iW3620 pin VIN.Resistance R 6, capacitor C 7 and diode D4 form elementary clamping protection circuit, absorb leakage inductance peak voltage protection switch pipe.R11 is output load resistance.
The electric main of input, after capacitor C 1 and inductance L 1 low-pass filtering, through the direct voltage of BDR1 rectification C2 filtering output, be added to the 3 pin VIN ends of iW3620 by starting resistance R5, in the time that VIN voltage reaches the turn-on threshold voltage 12V of chip, chip internal control circuit is started working.After system starts, VCC is powered through D5 rectification C6 filtering by the induced voltage of assisting winding N3.
IW3620 adopts transformer primary feedback control technology, and the voltage of feedback winding N3 is used for indirectly reflecting the height of output voltage, without using primary side feedback element, has simplified circuit design.Chip is by the variation of the voltage monitoring output voltage at detection output voltage sample resistance R3 two ends, if there is error, chip will be adjusted the output duty cycle of MOS switching tube Q1, and the Energy Transfer of control switch transformer T1 keeps the constant of output voltage.The sample resistance R2 of the utility model output voltage sample circuit and R3 are designed to respectively 33K Ω and 4.7K Ω, and the output voltage of driving power is 40V.
IW3620 is the peak current of sense switch primary winding periodically, and by the reference voltage comparison of the voltage at R9 two ends and chip internal, if there is error, chip will be adjusted the output duty cycle of MOS switching tube Q1, keeps the constant of output current.The sample resistance R8 of the utility model output current sample circuit is designed to 2.2 Ω, and the output current of driving power is 300mA.
The built-in multi-protective function of iW3620.When VCC voltage is during higher than 16V, chip turn-offs external power MOS switching tube Q1, autoboot until outside overvoltage condition remove; Chip internal thermal protection circuit detects junction temperature, and in the time that junction temperature exceedes threshold value, by switch-off power MOS switching tube Q1, until junction temperature declines after 30 ° of C, MOS switching tube Q1 just can be enabled again.
This LED lamp driving power source delivery efficiency >=84% in 85~264VAC voltage range, power factor >=0. 9.

Claims (3)

1. a LED lamp driving power source that adopts numerical control chip, is characterized in that: it is made up of EMI filter circuit, commercial power rectification filter circuit, PFC correcting circuit, numerical control chip iW3620, MOS switching tube, switch transformer, output voltage sample circuit, output current sample circuit and rectifier filter circuit; The input termination electric main power supply of EMI filter circuit, the input of output termination commercial power rectification filter circuit; The output of the input commercial power rectification filter circuit of pfc circuit, 1 end of the T1 armature winding N1 of output termination switch transformer, the drain electrode of the 2 termination MOS switching tube Q1 of armature winding N1; 5 ends of the output voltage sampling winding N3 of the input termination switch transformer T1 of output voltage sample circuit, the 2 pin INV ends of output termination numerical control chip iW3620; The source electrode of the input termination MOS switching tube Q1 of output current sample circuit, output connects the 6 pin INI ends of numerical control chip iW3620 through resistance R 8; The grid of MOS switching tube Q1 connects the 7 pin GATE ends of integrated circuit (IC) chip iW3620 through resistance R 7; 3 ends of the output winding N2 of the input termination switch transformer T1 of rectifier filter circuit, output termination LED lamp.
2. a kind of LED lamp driving power source that adopts numerical control chip according to claim 1, is characterized in that: the sample resistance R2 of output voltage sample circuit and R3 are designed to respectively 33K Ω and 4.7K Ω, and the output voltage of driving power is 40V.
3. a kind of LED lamp driving power source that adopts numerical control chip according to claim 1, is characterized in that: the sample resistance R8 of output current sample circuit is designed to 2.2 Ω, and the output current of driving power is 300mA.
CN201320803140.3U 2013-12-10 2013-12-10 LED lamp driving power supply using numerical control chip Expired - Fee Related CN203632933U (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104320886A (en) * 2014-11-04 2015-01-28 太仓电威光电有限公司 Intelligent led underwater fish catching lamp
CN106132035A (en) * 2016-08-31 2016-11-16 文创科技股份有限公司 Exchange input LED power drives module
CN109104791A (en) * 2018-08-25 2018-12-28 镇江市国晶电子科技有限公司 Optical road lamp control method
AT16334U1 (en) * 2014-10-16 2019-07-15 Tridonic Gmbh & Co Kg Operating circuit for lamps with PFC control unit
EP3605814A1 (en) * 2015-06-15 2020-02-05 Apple Inc. Systems and methods of operation for power converters having series-parallel mode active clamps
US10770965B2 (en) 2015-06-15 2020-09-08 Apple Inc. Control of series-parallel mode (SPM) clamped flyback converter
CN111901928A (en) * 2020-01-03 2020-11-06 杭州市中策职业学校 Subway LED lamp driving power supply capable of correcting power factor and power adjusting method

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT16334U1 (en) * 2014-10-16 2019-07-15 Tridonic Gmbh & Co Kg Operating circuit for lamps with PFC control unit
CN104320886A (en) * 2014-11-04 2015-01-28 太仓电威光电有限公司 Intelligent led underwater fish catching lamp
CN104320886B (en) * 2014-11-04 2017-05-03 太仓电威光电有限公司 Intelligent led underwater fish catching lamp
EP3605814A1 (en) * 2015-06-15 2020-02-05 Apple Inc. Systems and methods of operation for power converters having series-parallel mode active clamps
US10770977B2 (en) 2015-06-15 2020-09-08 Apple Inc. Systems and methods of operation for power converters having series-parallel mode active clamps
US10770965B2 (en) 2015-06-15 2020-09-08 Apple Inc. Control of series-parallel mode (SPM) clamped flyback converter
US10848069B2 (en) 2015-06-15 2020-11-24 Apple Inc. Systems and methods of operation for power converters having series-parallel mode active clamps
CN106132035A (en) * 2016-08-31 2016-11-16 文创科技股份有限公司 Exchange input LED power drives module
CN109104791A (en) * 2018-08-25 2018-12-28 镇江市国晶电子科技有限公司 Optical road lamp control method
CN111901928A (en) * 2020-01-03 2020-11-06 杭州市中策职业学校 Subway LED lamp driving power supply capable of correcting power factor and power adjusting method
CN111901928B (en) * 2020-01-03 2022-06-10 杭州市中策职业学校 Subway LED lamp driving power supply capable of correcting power factor and power adjusting method

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