CN205510473U - High power LED drive power supply with PFC function - Google Patents
High power LED drive power supply with PFC function Download PDFInfo
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- CN205510473U CN205510473U CN201620225049.1U CN201620225049U CN205510473U CN 205510473 U CN205510473 U CN 205510473U CN 201620225049 U CN201620225049 U CN 201620225049U CN 205510473 U CN205510473 U CN 205510473U
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Abstract
The utility model discloses a high power LED drive power supply with PFC function, include: power input end, EMI wave filter, diode, flyback converter, rectifier module, voltage limiting galvanostat, the load of LED lamp, power input end with the EMI wave filter is connected, the EMI wave filter with the diode is connected, the diode with flyback converter connects, flyback converter with the rectifying and wave -filtering unit connection, voltage limiting galvanostat with the load of LED lamp is connected, when the scheme is adopted, the utility model has the characteristics of simple structure, small, job stabilization is reliable, entire system's power factor is higher, total harmonic distortion is rateed for a short time.
Description
Technical field
This utility model relates to field of power supplies, refers more particularly to a kind of high-capacity LED with PFC function and drives power supply.
Background technology
At present, due to LED light source have energy-saving and environmental protection, efficiently and the plurality of advantages such as length in service life and be used widely, and possible as a kind of green light source product, progressively obtain traditional lighting source.But, the forward voltage drop at LED light source two ends and its electric current present non-linear relation, and forward voltage drop change can cause forward current larger fluctuation；Additionally, the PN junction of LED light source has negative temperature coefficient, along with PN junction temperature raises, forward current can strengthen further, in some instances it may even be possible to causes LED light source cisco unity malfunction；It addition, as LED light source, its luminous flux and electric current are approximated to proportional relation, curent change can cause LED light source brightness unstable.Therefore, from the point of view of high-power LED light source, designing constant-current driving power supply, and possess High Power Factor and high reliability, tool is of great significance.Traditional single-stage off-line type change-over circuit, is all to be made up of a full-bridge rectification and a capacitor filtering.Filter capacitor must be sufficient to obtain a smaller DC voltage of ripple voltage, at most of time, voltage on electric capacity is higher than input ac voltage, full-wave rectifying circuit work very short time so that electrical network input current becomes narrow pulse waveform, and amplitude is the highest, grid voltage waveform distorts, and the ability to transmit electricity of electrical network weakens significantly, and conventional bridge rectification strengthens the circuit of capacitor filtering mode, power factor is the lowest, is badly in need of improving the power factor of power-supply system；Therefore prior art existing defects, needs to improve.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of high-capacity LED with PFC function and drives power supply.
For achieving the above object, this utility model be have employed following technical scheme: a kind of high-capacity LED with PFC function drives power supply, including: power input, electromagnetic interface filter, diode, anti exciting converter, rectification filtering module, pressure limiting galvanostat, LED load, error amplifier, multiplier, current constant control chip, drive circuit unit, power switch pipe；Described power input is connected with described electromagnetic interface filter；Described electromagnetic interface filter is connected with described diode；Described diode is connected with described anti exciting converter；Described anti exciting converter is connected with described rectification filtering unit；Described pressure limiting galvanostat is connected with the load of described LED；Described error amplifier is connected with described pressure limiting galvanostat；Described error amplifier is connected with described multiplier；The positive pole of described diode is connected with described multiplier；The negative pole of described diode is connected with pressure indicator；Described multiplier is connected with described pressure indicator；Described pressure indicator is connected with described drive circuit unit；Described drive circuit unit is connected with described power switch pipe；Described power switch pipe is connected with described anti exciting converter；Described current constant control chip is connected with described error amplifier.
Preferably, described anti exciting converter have employed PFC control unit, and described PFC control unit produces control signal thus reduces current harmonics, improves the power factor of system.
Preferably, described power switch pipe arranges a main control chip；The PFC under critical conduction mode of the described main control chip.
Preferably, described main control chip is L6562A chip；Described L6562A chip is provided with the protection of accurate adjustable exterior overvoltage, internal starts and digital filter that the optimization circuit module of zero current detection function, high frequency region still can work and pin.
Preferably, described current constant control chip is TSM1052 chip；Described TSM1052 chip has two and controls rings, it is possible to obtain higher constant voltage, constant flow regulation.
Providing the benefit that relative to prior art, using such scheme, it is little, stable and reliable in work that this utility model has simple in construction, volume, and the power factor of whole system is higher, the feature that total harmonic distortion factor is little.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of an embodiment of the present utility model.
Detailed description of the invention
For the ease of understanding this utility model, below in conjunction with the accompanying drawings and specific embodiment, this utility model is described in detail.Accompanying drawing gives preferred embodiment of the present utility model.But, this utility model can realize in many different forms, however it is not limited to the embodiment described by this specification.On the contrary, providing the purpose of these embodiments is to make the understanding to disclosure of the present utility model more thorough comprehensively.
It should be noted that be referred to as " being fixed on " another element when element, it can be directly on another element or can also there is element placed in the middle.When an element is considered as " connection " another element, and it can be directly to another element or may be simultaneously present centering elements.The term that this specification is used " is fixed ", " one-body molded ", "left", "right" and similar statement for illustrative purposes only.
Unless otherwise defined, all of technology that this specification is used and scientific terminology are identical with belonging to the implication that those skilled in the art of the present utility model are generally understood that.This specification is intended merely to describe the purpose of specific embodiment at term used in the description of the present utility model, is not intended to limit this utility model.
As shown in Figure 1, an embodiment of the present utility model is: a kind of high-capacity LED with PFC function drives power supply, including: power input, electromagnetic interface filter, diode, anti exciting converter, rectification filtering module, pressure limiting galvanostat, LED load, error amplifier, multiplier, current constant control chip, drive circuit unit, power switch pipe；Described power input is connected with described electromagnetic interface filter；It is mainly the noise suppressing electric network noise and self producing, eliminates the electrical network impact on LED drive power, improve the capacity of resisting disturbance of LED drive power and the reliability of this system；Described electromagnetic interface filter is connected with described diode；Described diode is connected with described anti exciting converter；Mainly described EMI output signal it is converted into direct current signal and exports to described anti exciting converter；
Described anti exciting converter is connected with described rectification filtering unit, power switch pipe, pressure limiting galvanostat, LED load；Accept diode output signal, voltage conversion is carried out under the control of power switch pipe, converted voltage is sent to rectification filtering unit, the noise self produced is removed through rectification filtering unit, through pressure limiting galvanostat, electric current and magnitude of voltage that output is limited are transferred to LED load and drive its work；Described power switch pipe is also connected with described drive circuit, voltage indicator；Described voltage indicator negative pole is connected with the negative pole of described diode；Described voltage indicator positive pole is connected with described multiplier by described diode cathode；Described anti exciting converter have employed PFC control unit, and described PFC control unit produces control signal thus reduces current harmonics, improves the power factor of system；Described error amplifier is connected with described pressure limiting galvanostat；Described error amplifier is connected with described multiplier.
Described power switch pipe is provided with main control chip, and described main control chip is L6562A chip；Described L6562A chip is provided with the protection of accurate adjustable exterior overvoltage, internal starts and digital filter that the optimization circuit module of zero current detection function, high frequency region still can work and pin；L6562A chip has eight pins, pin 1 to be anti-phase error amplifier input terminal, and the preregulated output voltage signal of PFC is inputted by electric resistance partial pressure, it is provided that Voltage Feedback inputs；Pin 2 is error amplifier output, and pin 1 constitutes feedback compensation network, thus ensures that voltage control loop is stable, it is thus achieved that High Power Factor and low total harmonic distortion；Pin 3 is multiplier input, connects into rectifier power source by resitstance voltage divider, provides sinusoidal reference signal for electric current loop simultaneously；Pin 4 compares for being input to PWM control loop, is flowed into the current signal of switching tube by resistance measurement, and the pressure drop and the internal sine signal that are formed on resistance compare, and determine the break-make of switching tube；Pin 5 is zero current detection input；Pin 6 is earth terminal；Pin 7 exports for gate-drive, and pin 8 inputs for chip power.In conjunction with the pin function of chip, the inverse-excitation type LED drive circuit constituted with L6562A chip.Wherein, R1, R2 constitute pressure sampling circuit, and its sampled voltage is inputted chip the 3rd pin.C1 is the filter capacitor of system.R3, R4 and C2 are the compensation network of chip internal error amplifier.R5 is the current-limiting resistance of chip power supply leads ends.R6 is that primary winding current detects resistance.R7 is zero passage detection current-limiting resistance, the zero passage detection leads ends of access chip.R8, C3, D2 constitute voltage spikes absorbing circuit.R9 is the driving current-limiting resistance of power switch pipe.
In order to realize the current constant control of system, system output voltage and electric current are added L6562A chip by TSM1025 chip, optocoupler and feedback circuit, controls the switching frequency of switching tube with this；Described TSM1052 chip has two and controls rings, it is possible to obtain higher constant voltage, constant flow regulation；TSM1052 chip has six pins, pin 1 to be the inverting input of Voltage loop amplifier, obtains output voltage signal by resitstance voltage divider；Pin 2 is earth terminal；Pin 3 is outfan, is connected to optocoupler, the photodiode transmission error signal in optocoupler；Pin 4 is electric current loop amplifier in-phase input end, accesses sensed current signal；Pin 5 is electric current loop amplifier inverting input；Pin 6 is chip power.
In order to assist this power circuit periphery design, with 100 ~ 260V alternating voltage for input, output voltage is 15V, exports electric current 2A, and minimal switching frequency is 30KHz, and power supply conversion efficiency is 85% analysis carried out above.Optional primary winding inductance amount is 800uH, and minimum magnetic core product of areas is 0.4, and optional EE28*33.6*10.7 is as transformer core.The primary and secondary winding of transformator can rotating around 84 circles, 0.41mm and 13 circles, 0.51mm and around.Can select the pressure 600V that reaches, the switching tube of rated current 7A is as master switch.
Providing the benefit that relative to prior art, using such scheme, it is little, stable and reliable in work that this utility model has simple in construction, volume, and the power factor of whole system is higher, the feature that total harmonic distortion factor is little.
It should be noted that above-mentioned each technical characteristic continues to be mutually combined, form various embodiments the most enumerated above, be accordingly to be regarded as the scope that this utility model description is recorded；Further, for those of ordinary skills, can be improved according to the above description or be converted, and all these modifications and variations all should be belonged to the protection domain of this utility model claims.
Claims (5)
1. a high-capacity LED with PFC function drives power supply, it is characterized in that, including: power input, electromagnetic interface filter, diode, anti exciting converter, rectification filtering module, pressure limiting galvanostat, LED load, error amplifier, multiplier, current constant control chip, drive circuit unit and power switch pipe；Described power input is connected with described electromagnetic interface filter；Described electromagnetic interface filter is connected with described diode；Described diode is connected with described anti exciting converter；Described anti exciting converter is connected with described rectification filtering module；Described pressure limiting galvanostat is connected with the load of described LED；Described error amplifier is connected with described pressure limiting galvanostat；Described error amplifier is connected with described multiplier；The positive pole of described diode is connected with described multiplier；The negative pole of described diode is connected with pressure indicator；Described multiplier is connected with described pressure indicator；Described pressure indicator is connected with described drive circuit unit；Described drive circuit unit is connected with described power switch pipe；Described power switch pipe is connected with described anti exciting converter；Described current constant control chip is connected with described error amplifier.
A kind of high-capacity LED with PFC function drives power supply, it is characterised in that described anti exciting converter have employed PFC control unit, and described PFC control unit produces control signal thus reduces current harmonics, improves the power factor of system.
A kind of high-capacity LED with PFC function drives power supply, it is characterised in that described power switch pipe arranges a main control chip；The PFC under critical conduction mode of the described main control chip.
A kind of high-capacity LED with PFC function drives power supply, it is characterised in that described main control chip is L6562A chip；Described L6562A chip is provided with the protection of accurate adjustable exterior overvoltage, internal starts and digital filter that the optimization circuit module of zero current detection function, high frequency region still can work and pin.
A kind of high-capacity LED with PFC function drives power supply, it is characterised in that described current constant control chip is TSM1052 chip；Described TSM1052 chip has two and controls rings, it is possible to obtain higher constant voltage, constant flow regulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620225049.1U CN205510473U (en) | 2016-03-23 | 2016-03-23 | High power LED drive power supply with PFC function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620225049.1U CN205510473U (en) | 2016-03-23 | 2016-03-23 | High power LED drive power supply with PFC function |
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| Publication Number | Publication Date |
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| CN205510473U true CN205510473U (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620225049.1U Expired - Fee Related CN205510473U (en) | 2016-03-23 | 2016-03-23 | High power LED drive power supply with PFC function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107171544A (en) * | 2017-05-23 | 2017-09-15 | 杭州电子科技大学 | A kind of full digital full-bridge isolated single-phase single-grade PFC（PFC）Converter |
| CN111083847A (en) * | 2020-01-08 | 2020-04-28 | 广东电网有限责任公司 | High-power-factor LED driving system of transformer substation |
-
2016
- 2016-03-23 CN CN201620225049.1U patent/CN205510473U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107171544A (en) * | 2017-05-23 | 2017-09-15 | 杭州电子科技大学 | A kind of full digital full-bridge isolated single-phase single-grade PFC（PFC）Converter |
| CN111083847A (en) * | 2020-01-08 | 2020-04-28 | 广东电网有限责任公司 | High-power-factor LED driving system of transformer substation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160824 Termination date: 20170323 |