CN205726524U

CN205726524U - The little road lamp power supply of high precision constant current

Info

Publication number: CN205726524U
Application number: CN201620312061.6U
Authority: CN
Inventors: 王永忠; 赵桌婉
Original assignee: CHENGDU HENGWEN PHOTOELECTRIC TECHNOLOGY Co Ltd
Current assignee: CHENGDU HENGWEN PHOTOELECTRIC TECHNOLOGY Co Ltd
Priority date: 2016-04-14
Filing date: 2016-04-14
Publication date: 2016-11-23
Anticipated expiration: 2026-04-14

Abstract

The utility model discloses a kind of little road lamp power supply of high precision constant current, mainly solve existing led present in prior art and drive the low instability of current precision of power supply output so that it is life-span the highest；And the problem of the noise jamming carried by civil power.The little road lamp power supply of this high precision constant current includes rectification module, transformer module, sampling feedback module, PWM control module, current output module；Rectification module is full wave bridge rectifier, and its cathode power supply input and negative power supply input are connected with phase line and the zero line of civil power respectively；Rectification module is electrically connected with transformer module, sampling feedback module successively；Transformer module and sampling feedback module are electrically connected with PWM control module respectively, and the voltage output end of PWM control module is electrically connected with the voltage input end of current output module.By such scheme, this utility model has reached output current precision high stable, and high life, decreases the purpose of interference in alternating current.

Description

The little road lamp power supply of high precision constant current

Technical field

This utility model relates to power technique fields, specifically, relates to a kind of little street lamp of high precision constant current Power supply.

Background technology

In today that global energy shortage and World Environment Problems are increasingly serious, led lighting has extensively Wealthy application space；LED lamp product quality the most on the market is very different, and good light fixture must be equipped with Good power drives, the preferable led of part mass drives power supply cost the highest, and partial power poor efficiency is low The PF life-span is short, and later maintenance cost is high, and the signboard making LED lamp environmental protection high energy efficiency can not perfect body Existing；Conventional civil power be alternating current its carry noise, it will increase in the loss of circuit and output voltage and contain There are ripple or noise；Existing led drive power supply output the low instability of current precision so that it is service life The highest.

Utility model content

Problem to be solved in the utility model is the low instability of current precision that existing led drives power supply output, The service life making it is the highest；Conventional civil power be alternating current its carry noise, it will increase the damage of circuit Containing ripple or noise in consumption and output voltage.

In order to solve the problems referred to above, this utility model following technical scheme of offer:

A kind of little road lamp power supply of high precision constant current include rectification module, transformer module, sampling feedback module, PWM control module, current output module；Rectification module is full wave bridge rectifier, its cathode power supply input It is connected with phase line and the zero line of civil power respectively with negative power supply input；Rectification module successively with transformer module, Sampling feedback module is electrically connected；Transformer module and sampling feedback module are electrically connected with PWM control module respectively, PWM The voltage output end of control module is electrically connected with the voltage input end of current output module.

Further, lightning protection immunity module it is powered with between module.

Specifically, the protective tube F1 that module includes being electrically connected, the variable resistance being electrically connected with civil power zero line are disturbed with civil power phase line Device RT1, be electrically connected the varistor RV1 between protective tube F1 and rheostat RT1, with protective tube F1 and pressure The electric capacity CY2 that quick resistance RV1 contact is electrically connected, the electric capacity CY1 being electrically connected with civil power zero line and rheostat RT1 contact, Electric capacity CY1 and electric capacity CY2 be electrically connected after ground connection, inductance LF1 in parallel with varistor successively, resistance RX1, Electric capacity CX1, inductance LF2, it is in parallel with inductance LF1 that resistance RX1 is in series with resistance RX2, resistance RX2.

Specifically, PWM control module includes switch integrated circuit and the peripheral circuit thereof that model is L6562, The peripheral circuit of L6562 type switch integrated circuit uses FLYBACK framework.

Specifically, transformer module is four winding isolation transformers.

Specifically, sampling feedback module includes feedback controller and the peripheral circuit thereof that model is LM358SSR.

Specifically, current output module includes the electrochemical capacitor being electrically connected with the voltage output end of PWM control module C27, inductance LF3, electric capacity C31 in parallel with electrochemical capacitor C27 successively, the positive terminal of electric capacity C31 and electricity The contact output cathode voltage of one positive voltage output end of sense LF3, the negative pole end of electric capacity C31 and inductance LF3 The contact output negative pole voltage of a negative voltage outfan.

Compared with prior art, this utility model has the advantages that

(1) L6562 type switch integrated circuit and FLYBACK framework formula peripheral circuit thereof in this utility model, Utilize internal error amplifier to form primary current closed loop feedback network, thus reach high constant current accuracy and height is defeated Entering/export regulation, this utility model uses sampling feedback module to be secondary current feedback control electric current simultaneously Output, the current precision that output uses to load after primary current feedback and secondary current are fed back is the highest more Stable.

(2) in this utility model, depressor module is four winding isolation transformers；Four winding isolation transformers can be pacified Entirely avoiding Danger Electric shock risk reliably, it is L6562 type switch integrated circuit and LM358SSR type feedback controller Stable power supply, makes L6562 type switch integrated circuit and LM358SSR type feedback controller normally work.

(3) in this utility model, protective tube F1 can prevent occurring fire in the case of abnormity of power supply, reduces The loss of user, simultaneously its other electronic devices and components protected in the case of power work is abnormal；Pressure-sensitive electricity The model that resistance RV1 selects is 7D471, can prevent noncontact thunderbolt voltage 500V, absorbs thunderbolt energy and avoids Rear class electronic devices and components be struck by lightning high-energy damage, it is ensured that the reliability of power supply and long-life.

(4) in this utility model, electric capacity CX1 and inductance LF2 can effectively suppress the noise that alternating voltage carries Interference, it is to avoid noise enters late-class circuit and produces noise, thus increases the loss of circuit and the stricture of vagina of outfan Involve noise.

Accompanying drawing explanation

Fig. 1 is structured flowchart of the present utility model.

Fig. 2 is this utility model circuit theory diagrams.

Fig. 3 is each module distribution figure.

In above-mentioned accompanying drawing, component names corresponding to reference is as follows:

1-lightning protection immunity module, 2-rectification module, 3-PWM control module, 4-transformer module, 5-adopts Sample feedback module, 6-current output module.

Detailed description of the invention

The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings, embodiment party of the present utility model Formula includes but not limited to the following example.

Embodiment 1

As shown in Figure 1 to Figure 3, the little road lamp power supply of high precision constant current include rectification module 2, transformer module 4, Sampling feedback module 5, PWM control module 3, current output module 6；Rectification module 2 is that full wave bridge type is whole Stream device, its cathode power supply input and negative power supply input are connected with phase line and the zero line of civil power respectively；Whole Flow module 2 is electrically connected with transformer module 4, sampling feedback module 5 successively；Transformer module 4 and sampling feedback Module 5 is electrically connected with PWM control module 3 respectively, and the voltage output end of PWM control module 3 exports mould with electric current The voltage input end of block 6 is electrically connected.

Wherein, control module includes switch integrated circuit and peripheral circuit, the L6562 that model is L6562 The peripheral circuit of type switch integrated circuit uses FLYBACK framework；Depressor module is four winding isolation transformers； Four winding isolation transformers can be safe and reliable avoid Danger Electric shock risk, its be L6562 type switch integrated circuit and The power supply that LM358SSR type feedback controller is stable, makes L6562 type switch integrated circuit and LM358SSR type anti- Feedback controller normally works.

Wherein, sampling feedback module 5 includes feedback controller and the peripheral circuit thereof that model is LM358SSR； Stream output module includes the electrochemical capacitor C27 being electrically connected with the voltage output end of PWM control module, successively with electrolysis One positive electricity of inductance LF3, the electric capacity C31 that electric capacity C27 is in parallel, the positive terminal of electric capacity C31 and inductance LF3 The contact output cathode voltage of pressure outfan, the negative pole end of electric capacity C31 is defeated with inductance LF3 negative voltage Go out the contact output negative pole voltage of end；Electrochemical capacitor C31 uses Rubycon, and hyperfrequency low ripple is long-life Feature ensure that reliability and the long-life of power supply itself, the most also improves the life-span of load LED light source.

Embodiment 2

As shown in Figure 1 to Figure 3, the present embodiment difference from embodiment 1 is, civil power and rectification module 2 Between be powered with lightning protection immunity module 1；Lightning protection immunity module 1 includes the protective tube being electrically connected with civil power phase line F1, the rheostat RT1 being electrically connected with civil power zero line, be electrically connected between protective tube F1 and rheostat RT1 is pressure-sensitive Resistance RV1, the electric capacity CY2 being electrically connected with protective tube F1 and varistor RV1 contact, with civil power zero line and change Resistance device RT1 contact the electric capacity CY1, electric capacity CY1 and electric capacity CY2 that are electrically connected be electrically connected after ground connection, successively with pressure-sensitive electricity The inductance LF1 of resistance parallel connection, resistance RX1, electric capacity CX1, inductance LF2, resistance RX1 is in series with resistance RX2, Resistance RX2 is in parallel with inductance LF1.

Wherein, protective tube F1 can prevent occurring fire in the case of abnormity of power supply, reduces the loss of user, Its other electronic devices and components protected in the case of power work is abnormal simultaneously；Varistor RV1 selects Model is 7D471, noncontact can be prevented to be struck by lightning voltage 500V, absorb thunderbolt energy and avoid rear class electronics unit device Part be struck by lightning high-energy damage, it is ensured that the reliability of power supply and long-life；Electric capacity CX1 and inductance LF2 Can effectively suppress the noise jamming that alternating voltage carries, it is to avoid noise enters late-class circuit and produces noise, from And increase the loss of circuit and the ripple of outfan and noise.

L6562 type switch integrated circuit and FLYBACK framework formula peripheral circuit thereof in this utility model, utilize Internal error amplifier forms primary current closed loop feedback network, thus reaches high constant current accuracy and high input/defeated Going out regulation, this utility model uses sampling feedback module 5 to be the defeated of secondary current feedback control electric current simultaneously Go out, the current precision more Gao Gengwen that output uses to load after primary current feedback and secondary current are fed back Fixed.

As shown in Figure 1 to Figure 3, in use, civil power is anti-interference by lightning protection for embodiment 1 and embodiment 2 By after transformer module transformation being sampling feedback module and electric current output after over commutation module rectification after module Module provides power supply, is realized primary feedback and the secondary of electric current by PWM control module and sampling feedback module Feedback, exports to load LED eventually through current output module.

It is rectangle according to the PCB that this utility model is made, a size of 40*94mm；This utility model Size of power small-power density is big, easy for installation, and range is relatively wide, is widely portable to panel light, suction Ceiling light and little street lamp etc..

According to above-described embodiment, this utility model just can be realized well.What deserves to be explained is, based on above-mentioned On the premise of structure design, for solving same technical problem, though some made on this utility model Without substantial change or polishing, the essence of the technical scheme used still as this utility model, therefore It should also be as in protection domain of the present utility model.

Claims

1. the little road lamp power supply of high precision constant current, it is characterised in that: include rectification module (2), transformer module (4), sampling feedback module (5), PWM control module (3), current output module (6)；Rectification module (2) is full wave bridge rectifier, and its cathode power supply input and negative power supply input are connected with phase line and the zero line of civil power respectively；Rectification module (2) is electrically connected with transformer module (4), sampling feedback module (5) successively；Transformer module (4) and sampling feedback module (5) are electrically connected with PWM control module (3) respectively, and the voltage output end of PWM control module (3) is electrically connected with the voltage input end of current output module (6).

The little road lamp power supply of high precision constant current the most according to claim 1, it is characterised in that: it is powered with lightning protection immunity module (1) between civil power and rectification module (2).

The little road lamp power supply of high precision constant current the most according to claim 2, it is characterized in that: lightning protection immunity module (1) includes the protective tube F1 being electrically connected with civil power phase line, the rheostat RT1 being electrically connected with civil power zero line, be electrically connected the varistor RV1 between protective tube F1 and rheostat RT1, the electric capacity CY2 being electrically connected with protective tube F1 and varistor RV1 contact, the electric capacity CY1 being electrically connected with civil power zero line and rheostat RT1 contact, electric capacity CY1 and electric capacity CY2 be electrically connected after ground connection, inductance LF1 in parallel with varistor successively, resistance RX1, electric capacity CX1, inductance LF2, resistance RX1 is in series with resistance RX2, resistance RX2 is in parallel with inductance LF1.

The little road lamp power supply of high precision constant current the most according to claim 3, it is characterized in that: PWM control module (3) includes switch integrated circuit and the peripheral circuit thereof that model is L6562, the peripheral circuit of L6562 type switch integrated circuit uses FLYBACK framework.

The little road lamp power supply of high precision constant current the most according to claim 4, it is characterised in that: transformer module (4) is four winding isolation transformers.

The little road lamp power supply of high precision constant current the most according to claim 5, it is characterised in that: sampling feedback module (5) includes feedback controller and the peripheral circuit thereof that model is LM358SSR.

The little road lamp power supply of high precision constant current the most according to claim 6, it is characterized in that: current output module (6) includes the electrochemical capacitor C27 being electrically connected with the voltage output end of PWM control module (3), inductance LF3, electric capacity C31 in parallel with electrochemical capacitor C27 successively, the contact output negative pole voltage of one negative voltage outfan of the contact output cathode voltage of one positive voltage output end of the positive terminal of electric capacity C31 and inductance LF3, the negative pole end of electric capacity C31 and inductance LF3.