CN202841608U - LED power supply circuit possessing high power factor - Google Patents

LED power supply circuit possessing high power factor Download PDF

Info

Publication number
CN202841608U
CN202841608U CN 201220406452 CN201220406452U CN202841608U CN 202841608 U CN202841608 U CN 202841608U CN 201220406452 CN201220406452 CN 201220406452 CN 201220406452 U CN201220406452 U CN 201220406452U CN 202841608 U CN202841608 U CN 202841608U
Authority
CN
China
Prior art keywords
module
voltage
power factor
power supply
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 201220406452
Other languages
Chinese (zh)
Inventor
苏松得
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GUANGDONG LIANGDE OPTOELECTRONICS SCIENCE & TECHNOLOGY CO., LTD.
Original Assignee
GUANGDONG LIANGDE ELECTRONIC TECHNOLOGY CO LTD
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GUANGDONG LIANGDE ELECTRONIC TECHNOLOGY CO LTD filed Critical GUANGDONG LIANGDE ELECTRONIC TECHNOLOGY CO LTD
Priority to CN 201220406452 priority Critical patent/CN202841608U/en
Application granted granted Critical
Publication of CN202841608U publication Critical patent/CN202841608U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Abstract

The embodiment of the utility model discloses an LED power supply circuit possessing a high power factor, comprising a rectification module and a filter unit. The input end of the rectification module is connected with a voltage input end and outputs a rectification voltage, the filter unit carries out high frequency filtering on the rectification voltage. The LED power supply circuit possessing the high power factor also comprises a PFC power factor correction module, a constant current driving module, a voltage reduction module, a power switch module, a current acquisition module and a power supply module. The LED power supply circuit possessing the high power factor of the utility model avoids employing a transformer, and enables the circuit to be simplified and the space to be saved; by employing a valley-fill circuit, the power factor of the circuit and the power supply conversion efficiency are improved; by using the constant current driving module, the current of the circuit is constant, and the stable power supply of an LED load is guaranteed.

Description

LED power supply circuits with High Power Factor
Technical field
The utility model relates to a kind of LED power supply circuits, relates in particular to a kind of LED power supply circuits with High Power Factor.
Background technology
Present LED power supply circuits of the prior art generally adopt capacitance-resistance voltage reduction circuit to come reduced output voltage, it is little that it has a supply current, and output voltage is affected by mains ripple, when input voltage raise, LED brightness increased, when input voltage reduces, brightness reduces, affected illuminating effect, can damage eyesight under the normal phase use, also there is potential safety hazard in power supply circuits.And waste of energy is caused in its power factor (PF)≤0.6.
In the alternating current circuit parameter, the cosine in the phase difference between voltage and the electric current is called power factor, and numerically, power factor is the ratio of active-power P and apparent power S, i.e. cos Ф=P/S.The size of power factor is relevant with the load character of circuit, and for example, if the incandescent lamp bulb of being, resistance furnace constant resistance load are only arranged in the circuit, its power factor is 1 so; If have inductive or condensive load in the circuit, its power factor is just less than 1 so; If only have inductive or condensive load in the circuit, its power factor (PF) just is 0 so.Power factor is to weigh an important technical data of electric equipment efficiency, and power factor is low, illustrates that circuit is large for the reactive power of alternating magnetic field conversion, thereby has reduced the utilance of equipment, has increased the line powering loss.
Although the drive circuit of prior art LED has adopted large capacity inductance, electric capacity to improve power factor (PF), its basic power factor (PF) still is between 0.7～0.8.
Summary of the invention
The utility model embodiment technical problem to be solved is, a kind of LED power supply circuits with High Power Factor are provided.Circuit power factor can be increased to more than 0.9, and can stabilized zone dynamic load LED.
In order to solve the problems of the technologies described above, the utility model embodiment provides the power supply circuits of the LED with High Power Factor, comprise rectification module, filter unit, the input of described rectification module connects voltage input end and exports commutating voltage, described filter unit carries out High frequency filter to commutating voltage, also comprises PFC power factor correction module, constant-current driven module, voltage reduction module, power switch module, current acquisition module, supply module;
Described PFC power factor correction module is parallel on the described rectification module output, improves the power factor of circuit;
Described supply module comprises partial pressure unit, voltage regulation unit, described partial pressure unit to rectification after voltage carry out dividing potential drop, and have first, second section dividing potential drop subelement, described voltage regulation unit carries out voltage stabilizing to the voltage of second segment dividing potential drop subelement and is powered at constant-current driven module and power switch module;
Described constant-current driven module has low electronic compensating input (LN), switch drive output (OUT), current sample end (CS); Described low electronic compensating input (LN) connects the first paragraph dividing potential drop subelement output of described partial pressure unit, described switch drive output (OUT) drives described power switch module, described current sample end (CS) connects the current sample module, electric current to described power switch module detects, and according to the situation of change of the electric current electric current by the described power switch module of switch drive output (OUT) output voltage control, reaching constant current, described voltage reduction module to rectification after voltage carry out reduced output voltage.
Further, described voltage regulation unit is that a Zener diode reverse is connected between the second segment dividing potential drop subelement and ground wire of described partial pressure unit.
Further, described voltage reduction module is the BUCK circuit, has the first diode, inductance, resistance, electric capacity, the voltage output end that the negative electrode of described resistance, electric capacity one end and the first diode is connected in after the described rectification forms positive output end, and described resistance, the electric capacity other end form negative output terminal by the anodic bonding of described inductance and described the first diode.
Further, described power switch module is the N-channel MOS pipe, anode, resistance that the G utmost point of described N-channel MOS pipe connects the second diode that passes through are connected with the voltage of voltage regulation output of voltage regulation unit, the S utmost point connects the switch drive output (OUT) of described constant-current driven module, and the D utmost point connects the anodic formation charge circuit of the diode of described voltage reduction module.
Further, described PFC power factor correction module is for filling out the paddy circuit.
Further, described voltage input end is parallel with piezo-resistance.
Further, described current acquisition module is for being connected in the sampling resistor between current sample end (CS) and the ground wire.
Implement the utility model embodiment, have following beneficial effect: the utility model avoids adopting transformer, simplifies circuit, saves the space; Adopted and filled out the power factor that the paddy circuit improves circuit, improved the conversion efficiency of power supply; Use constant-current driven module, make circuital current constant, guaranteed the stable power-supplying of LED load.
Description of drawings
Fig. 1 is circuit basic principle schematic block diagram of the present utility model;
Fig. 2 is the utility model circuit theory schematic diagram.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing the utility model is described in further detail.
With reference to basic principle schematic block diagram of the present utility model shown in Figure 1.
The utility model relates to a kind of LED power supply circuits with High Power Factor, rectification module 20, filter unit 10 have been comprised, rectification module 20 parallel filtering unit 10 access voltage input ends, voltage input end can be common civil power, also can be the AC-input voltage of AC100 ~ 260V 50/60Hz, and filter unit 10 is lc circuit, input voltage is carried out High frequency filter, rectification module 20 is a rectifier bridge stack, and input voltage is carried out full-wave rectification, and the output commutating voltage.
Especially, the LED power supply circuits that the utlity model has High Power Factor have also comprised PFC power factor correction module 30, constant-current driven module 50, voltage reduction module 60, power switch module 70, current acquisition module 80, supply module 40.
PFC power factor correction module 30 is for filling out the paddy circuit on the commutating voltage output that is parallel to rectification module 20, increase considerably the angle of flow of rectifying tube, by filling and leading up Pinggu point, make input current become waveform close to sine wave from point's pulse, power factor (PF) is brought up to more than 0.9.
Supply module 40 has comprised partial pressure unit 401, voltage regulation unit 402,401 pairs of commutating voltages of partial pressure unit carry out dividing potential drop, and has the first dividing potential drop subelement 403, the second dividing potential drop subelement 404, the voltage of the first dividing potential drop subelement 403 is greater than the voltage of the second dividing potential drop subelement 404,402 voltages to the second dividing potential drop subelement 404 of voltage regulation unit are stablized, and be powered at constant-current driven module 50, power switch module 70, in the present embodiment, voltage regulation unit 402 is that a Zener diode reverse is connected between the second dividing potential drop subelement 404 and the ground wire, be the output that the negative electrode of Zener diode connects the second dividing potential drop subelement 404, anode then connects ground wire.
Constant-current driven module 50 has low electronic compensating input LN, switch drive output OUT, current sample end CS(Current sampling); Low electronic compensating input LN connects the output of the first dividing potential drop subelement 403 of partial pressure unit 401, line voltage compensation to the peak value threshold values, and the voltage between sampling LN and the VDD, the electric current of switch drive output OUT output voltage control power switch module 70,80 pairs of power switch module 70 switching currents of current acquisition module carry out sample detecting, and adjust output voltage switching time and the density of switch drive output OUT according to the situation of change of electric current, make the current constant of power switch module 70.
Need to describe, power switch module 70 comprises a N-channel MOS pipe, and works in the saturation region, i.e. constant current district.
Module after 60 pairs of rectifications of voltage reduction module is carried out reduced output voltage, and voltage reduction module 60 is the BUCK circuit, carries out the charging and discharging action control by power switch module 70.
The utility model provides preferred implementation shown in Figure 2.
The circuit theory diagrams of the present embodiment as shown in Figure 2.
The rectification module 20 of the utility model embodiment is a rectifier bridge stack DB, filter unit 10 is the high frequency filter that is comprised of inductance L 1, capacitor C 1 of access rectifier bridge stack DB prime, and for spike and the superpressure of voltage input, also access fuse F and piezo-resistance ZNR in parallel in filter unit 10 primes.
Improve the PFC power factor correction module 30 of circuit power for filling out the paddy circuit, negative electrode, anode are connected in series from beginning to end successively between diode D1, D2, the D3, and oppositely be connected on the commutating voltage output of rectifier bridge stack DB, and access respectively positive pole, the negative pole of capacitor C 3 between the negative electrode of diode D1, the D2 anode, the anode of diode D2, D3 negative electrode access respectively positive pole, the negative pole of capacitor C 2, and capacitor C 2, C3 are jumbo electrochemical capacitor.
The partial pressure unit 401 of supply module 40 is after divider resistance R1, R2, R7, R8 go here and there first and on the commutating voltage output of rectifier bridge stack DB, wherein the dividing potential drop of divider resistance R7, R8 is output as the Voltage-output of the first dividing potential drop subelement 403, and the dividing potential drop of resistance R 8 is output as the Voltage-output of the second dividing potential drop subelement 404; 402 of voltage regulation units are Zener diode D9, its plus earth line, and the dividing potential drop output of negative electrode contact resistance R8 is stablized resistance R 8 output voltages of the second dividing potential drop subelement 404.
Constant-current driven module 50 is constant current chip U1, and the feeder ear VCC of constant current chip U1 connects the voltage of voltage regulation output of Zener diode D9, and ground end GND connects ground wire, and constant current chip U1 also has low electronic compensating input LN, switch drive output OUT, current sample end CSThe dividing potential drop output of low electronic compensating input LN contact resistance R7, R8, switch drive output OUT is the drain terminal of chip internal power switch, the source of external power switch, the S utmost point that connects the N-channel MOS pipe of power switch module 70, current sample end CS samples to the sampling resistor R4 of current sample module 80, the electric current of R5, constant current chip U1 makes the current constant of power switch module 70 according to output voltage switching time and the density of the current sampling data control switch drive output OUT that obtains.
Constant current chip U1 also has the NE pin, is the turn-off time of setting power switch; The DIM pin is switch enable, simulation and PWM light modulation end, and the VCC pin connects the voltage stabilizing end of Zener diode D9, and by shunt capacitance C6 earth terminal.
Power switch module 70 has N-channel MOS pipe Q1, and the G utmost point of metal-oxide-semiconductor Q1 is connected with the output end of pressure-stabilizing of Zener diode D9 by diode D, resistance R 6, and the anode of diode D is for connecting the G utmost point, and the S utmost point connects the switch drive output OUT of constant current chip U1.
Voltage reduction module 60 is the BUCK circuit, one end of resistance R, capacitor C connects the commutating voltage output of rectifier bridge stack DB, form positive output end of the present utility model, the other end is connected with an end of inductance L 2, and forms negative output terminal of the present utility model, and the other end of inductance L 2 connects the anode of diode D10, the negative electrode of diode D10 connects the commutating voltage output of rectifier bridge stack DB, form discharge loop, the anode of diode D10 is connected with the D utmost point of N-channel MOS pipe Q1, forms charge circuit.
The utlity model has the advantage up to 0.9 power factor; the relative broad range that input can have to voltage; can realize the constant current supply for load; and when load short circuits; constant current chip U1 quits work, and load is produced the protection action, and piezo-resistance and fusible link then can be inputted when unusual at voltage; cut off input, protective circuit safety.
Above disclosed only is a kind of preferred embodiment of the utility model, certainly can not limit with this interest field of the utility model, and the equivalent variations of therefore doing according to the utility model claim still belongs to the scope that the utility model is contained.

Claims (7)

1. LED power supply circuits with High Power Factor, comprise rectification module, filter unit, the input of described rectification module connects voltage input end and exports commutating voltage, described filter unit carries out High frequency filter to commutating voltage, it is characterized in that, also comprise PFC power factor correction module, constant-current driven module, voltage reduction module, power switch module, current acquisition module, supply module;
Described PFC power factor correction module is parallel on the described rectification module output, improves the power factor of circuit;
Described supply module comprises partial pressure unit, voltage regulation unit, described partial pressure unit to rectification after voltage carry out dividing potential drop, and have first, second section dividing potential drop subelement, described voltage regulation unit carries out voltage stabilizing to the voltage of second segment dividing potential drop subelement and is powered at constant-current driven module and power switch module;
Described constant-current driven module has low electronic compensating input (LN), switch drive output (OUT), current sample end (CS); Described low electronic compensating input (LN) connects the first paragraph dividing potential drop subelement output of described partial pressure unit, described switch drive output (OUT) drives described power switch module, described current sample end (CS) connects the current sample module, electric current to described power switch module detects, and according to the situation of change of the electric current electric current by the described power switch module of switch drive output (OUT) output voltage control, reaching constant current, described voltage reduction module to rectification after voltage carry out reduced output voltage.
2. the LED power supply circuits with High Power Factor according to claim 1 is characterized in that, described voltage regulation unit is that a Zener diode reverse is connected between the second segment dividing potential drop subelement and ground wire of described partial pressure unit.
3. LED power supply circuits with High Power Factor according to claim 1, it is characterized in that, described voltage reduction module is the BUCK circuit, has the first diode, inductance, resistance, electric capacity, the voltage output end that the negative electrode of described resistance, electric capacity one end and the first diode is connected in after the described rectification forms positive output end, and described resistance, the electric capacity other end form negative output terminal by the anodic bonding of described inductance and described the first diode.
4. according to claim 1 or 3 described LED power supply circuits with High Power Factor, it is characterized in that, described power switch module is the N-channel MOS pipe, anode, resistance that the G utmost point of described N-channel MOS pipe connects the second diode that passes through are connected with the voltage of voltage regulation output of voltage regulation unit, the S utmost point connects the switch drive output (OUT) of described constant-current driven module, and the D utmost point connects the anodic formation charge circuit of the diode of described voltage reduction module.
5. the LED power supply circuits with High Power Factor according to claim 1 is characterized in that, described PFC power factor correction module is for filling out the paddy circuit.
6. the LED power supply circuits with High Power Factor according to claim 1 is characterized in that, described voltage input end is parallel with piezo-resistance.
7. the LED power supply circuits with High Power Factor according to claim 1 is characterized in that, described current acquisition module is for being connected in the sampling resistor between current sample end (CS) and the ground wire.
CN 201220406452 2012-08-16 2012-08-16 LED power supply circuit possessing high power factor Expired - Fee Related CN202841608U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220406452 CN202841608U (en) 2012-08-16 2012-08-16 LED power supply circuit possessing high power factor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220406452 CN202841608U (en) 2012-08-16 2012-08-16 LED power supply circuit possessing high power factor

Publications (1)

Publication Number Publication Date
CN202841608U true CN202841608U (en) 2013-03-27

Family

ID=47953193

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201220406452 Expired - Fee Related CN202841608U (en) 2012-08-16 2012-08-16 LED power supply circuit possessing high power factor

Country Status (1)

Country Link
CN (1) CN202841608U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102781147A (en) * 2012-08-16 2012-11-14 广东良得电子科技有限公司 LED (Light-emitting diode) power supply circuit with high power factor
CN104159373A (en) * 2014-08-15 2014-11-19 北京博尚信科技有限公司 LED energy-saving lamp based on adaptive variable circuit and circuit control method thereof
US10312796B1 (en) 2018-06-15 2019-06-04 Chicony Power Technology Co., Ltd. Power supply system and power converter with start circuit for boost modules

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102781147A (en) * 2012-08-16 2012-11-14 广东良得电子科技有限公司 LED (Light-emitting diode) power supply circuit with high power factor
CN102781147B (en) * 2012-08-16 2014-10-01 广东良得光电科技有限公司 LED (Light-emitting diode) power supply circuit with high power factor
CN104159373A (en) * 2014-08-15 2014-11-19 北京博尚信科技有限公司 LED energy-saving lamp based on adaptive variable circuit and circuit control method thereof
CN104159373B (en) * 2014-08-15 2015-09-16 北京博尚信科技有限公司 Based on LED electricity-saving lamp and the circuit control method thereof of self-adapting changeable circuit
US10312796B1 (en) 2018-06-15 2019-06-04 Chicony Power Technology Co., Ltd. Power supply system and power converter with start circuit for boost modules

Similar Documents

Publication Publication Date Title
CN203368317U (en) High PFC constant current control device without loop compensation and voltage converter
CN102754531B (en) Led driving power supply circuit, driving power supply and lighting device
CN102215615A (en) Driving circuit for LED (light emitting diode) lamp
CN104768265A (en) High-power LED constant-current driving circuit
CN103458557A (en) LED drive control circuit and LED lamp
CN102781147B (en) LED (Light-emitting diode) power supply circuit with high power factor
CN102833902B (en) Booster type constant current driver circuit for LED
CN102612196B (en) LED (Light Emitting Diode) constant-current drive circuit and LED lamp using same
CN202841608U (en) LED power supply circuit possessing high power factor
CN205319941U (en) Double - circuit voltage conversion control chip , double - circuit voltage conversion ware and electronic electric energy meter
CN202906767U (en) Switching power supply with continuously adjustable output voltage
CN204392656U (en) LED drive circuit and LED switch driving power
CN104735845A (en) Efficient 60-W LED driving power source
CN203788153U (en) Over-power compensation circuit of flyback power supply
CN104124862A (en) High-PFC constant current control device without loop compensation and voltage converter
CN103647447B (en) The supply unit of a kind of electric energy table communication module
CN203618173U (en) LED lamp driving power based on primary side feedback
CN202857064U (en) Novel wide-input-voltage LED non-isolated single-chip constant-current drive circuit
CN204761752U (en) Low -voltage building site LED light drive power supply
CN204482133U (en) A kind of LED constant pressure and flow drive circuit
CN201182026Y (en) Driving power supply device of LED lamp group
CN203872387U (en) Power off non-stroboscopic second gear dimmable LED driving power supply
CN204795770U (en) Low ripple LED drive power supply's of no electrolytic capacitor intelligent digital control circuit
CN204578382U (en) A kind of single-chip switching stabilized voltage power supply
CN203761627U (en) LED constant current drive circuit

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
C56 Change in the name or address of the patentee

Owner name: GUANGDONG LIANGDE OPTOELECTRONIC TECHNOLOGY CO., L

Free format text: FORMER NAME: GUANGDONG LIANGDE ELECTRONIC TECHNOLOGY CO., LTD.

CP03 Change of name, title or address

Address after: 515000. B building, foreign and Cantonese audiovisual company, Shantou, Guangdong, Shantou

Patentee after: GUANGDONG LIANGDE OPTOELECTRONICS SCIENCE & TECHNOLOGY CO., LTD.

Address before: 515000 Guangdong city of Shantou Province east of Chaonan Chen Zhen Chen Weicun Dongxing Road

Patentee before: Guangdong Liangde Electronic Technology Co.,Ltd.

CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130327

Termination date: 20150816

EXPY Termination of patent right or utility model