CN202135380U - Track-used self-dimming LED drive power supply - Google Patents
Track-used self-dimming LED drive power supply Download PDFInfo
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- CN202135380U CN202135380U CN201120282962U CN201120282962U CN202135380U CN 202135380 U CN202135380 U CN 202135380U CN 201120282962 U CN201120282962 U CN 201120282962U CN 201120282962 U CN201120282962 U CN 201120282962U CN 202135380 U CN202135380 U CN 202135380U
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Abstract
The utility model relates to a track-used self-dimming LED drive power supply, which is electrically connected with an LED light source and comprises an AC rectifying unit, a PWM (Pulse Width Modulation) drive chip, a PWM drive chip working unit, a PWM drive switch unit, a voltage conversion rectifying unit, an output constant current voltage stabilization unit and a dimming control unit that are electrically connected in order from input to output, wherein the AC rectifying unit is used for converting alternating current into pulsating direct current, the PWM drive switch unit carries out chopping to the pulsating direct current output by a rectifying circuit, with the width and frequency of the chopping being controlled by the PWM drive chip, the voltage conversion rectifying unit is used for converting a PWM power supply after chopping into a low voltage PWM power supply, the output constant current voltage stabilization unit is used for carrying out current and voltage control of the output PWM power supply, and the dimming control unit is electrically connected with the PWM drive chip and is used for adjusting the dimming control signal of the drive chip. The drive power supply can carry out dimming to track lamps, and has good dimming linearity.
Description
Technical field
The utility model relates to the LED driving power, is specifically related to a kind of LED track and uses from the dimming LED (Light Emitting Diode) driving power.
Background technology
Along with the continuous maturation of LED, LED has been applied to track lamp, the track lamp of being sold on the market at present; Adopt the LED constant-flow driver to drive, can't carry out the bright dipping adjustment to the LED track lamp according to field conditions, and the led driver that adopts controllable silicon to carry out light modulation is applied to track lamp; Technology maturity is not enough at present, and when causing light modulation, the light modulation linearity is inconsistent between each light fixture; The light fixture bright dipping is inconsistent, and light fixture has phenomenons such as flicker in the system.Restricted the application of LED on track lamp.
The utility model content
The utility model technical issues that need to address are, how to provide a kind of track to use from the dimming LED (Light Emitting Diode) driving power, and it is good to adjust the on-the-spot light output of track LED light fixture and the linearity, further the power supply deixis can be arranged.
The above-mentioned technical problem of the utility model solves like this: make up a kind of track and use from the dimming LED (Light Emitting Diode) driving power, be electrically connected led light source, comprise that output is electrically connected successively from being input to:
AC rectification unit: be used for alternating current is converted into Rectified alternating current;
Pulse width modulation (PWM) chip for driving, PWM chip for driving working cell and PWM driving switch unit: PWM driving switch unit carries out copped wave to the Rectified alternating current of rectification circuit output, and the width of this copped wave and frequency receive the control of PWM chip for driving;
Voltage transformation rectification unit: be used for being converted into low pressure PWM power supply to the PWM power supply after the copped wave;
Output constant current voltage regulation unit: be used for the PWM power supply of output is carried out current/voltage control;
It is characterized in that, also comprise:
Dimming control unit: being used for of being electrically connected with said PWM chip for driving adjusted the dimming control signal of said chip for driving.
According to the driving power that the utility model provides, also comprise the Electro Magnetic Compatibility EMC unit that is connected electrically between input and the said direct current rectification unit.
According to the driving power that the utility model provides, also comprise the working power indicating member that is electrically connected with said direct current rectification unit.
According to the driving power that the utility model provides, said working power indicating member comprises one or more light-emitting diode.
According to the driving power that the utility model provides, also comprise the output control chip working cell that is connected electrically between said voltage transformation rectification unit and the output constant current voltage regulation unit.
According to the driving power that the utility model provides, also comprise the over-temperature protection unit that is electrically connected with the work of said output control chip.
The driving power that provides according to the utility model; Said dimming control unit comprises PNP triode and NPN triode; Wherein: said PNP transistor emitter is electrically connected said NPN transistor collector; Said PNP transistor collector is electrically connected said NPN transistor base, and the slide head of second by-pass cock is electrically connected said PNP transistor collector; Said PNP transistor emitter also is electrically connected said PNP transistor collector through first by-pass cock, and the slide head of first by-pass cock is electrically connected said PNP transistor base; Said PNP transistor base is electrically connected said PNP transistor collector through electric capacity, also is electrically connected said PNP transistor emitter through the 29 resistance; Said NPN transistor collector is electrically connected said NPN transistor emitter through the 26 resistance.
The track that the utility model provides is used from the dimming LED (Light Emitting Diode) driving power, adopts the led driver chip have dimming function, and according to the dimming function of led driver chip; Construct the good peripheral light adjusting circuit of a kind of linearity, thereby when realizing light modulation, realize the favorable linearity light modulation; Simultaneously, increase power supply power supply indicating circuit, have the following advantages conveniently to carry out the bright dipping adjusting: can carry out light modulation to track lamp as required; And the light modulation linearity is good; The light modulation compound linear is good, can not impact other light fixtures, and light fixture light output adjustment is very convenient.
Description of drawings
Further the utility model is elaborated below in conjunction with accompanying drawing and specific embodiment.
Fig. 1 is the utility model functional-block diagram;
Fig. 2 is Fig. 1 corresponding circuits sketch map.
Embodiment
As illustrated in fig. 1 and 2, the utility model is from the dimming LED (Light Emitting Diode) driving power, and this power supply comprises:
EMC unit and AC rectification unit 1: alternating current is converted into Rectified alternating current, and, makes the electromagnetic compatibility of track lamp satisfy the requirement of laws and regulations, suppress electromagnetic disturbance in light modulation or uncomfortable light time;
Working power indicating member 2: be used for detecting input current supply circuit state, the power supply of indication LED track lamp is normal;
PWM driving switch unit 3: the Rectified alternating current to the output of AC rectification unit carries out copped wave, and the width of this copped wave and frequency are activated the control of chip;
PWM chip for driving working cell 5: the LED chip for driving is supplied power, guarantee the chip for driving operate as normal simultaneously;
Dimming control unit 4: the dimming control signal to chip for driving is adjusted, and to satisfy between light fixture output light and adjusting knob good linearty is arranged;
Voltage transformation rectification unit 6: the PWM power supply after the copped wave, be converted into low pressure PWM power supply, and realize the isolation of input circuit and output circuit;
Output control chip IC working cell 7: the control chip to output is supplied power, and guarantees the control chip operate as normal simultaneously;
Output constant current voltage regulation unit 8: the power supply to output carries out current/voltage control, thereby satisfies the requirement of LED work;
Over-temperature protection unit 9: the working temperature to the track lamp drive power supply detects, thereby carries out high temperature protection, is beneficial to safety.
This circuit working principle is specific as follows:
Behind the civil power process EMC unit, be added to the AC rectification unit and carry out rectification.Power supply after the rectification at first gets into the power supply indicating member, and the driving LED indicator light is bright, shows civil power and EMC circuit, and rectification circuit is normal;
Simultaneously; Power supply after the rectification starts IC and starts working through PWM chip for driving working cell power supply, and the power supply of output pwm signal control PWM switch element after to rectification carries out copped wave; Power supply after the copped wave carries out buck to the power supply after the copped wave and transforms through the change in voltage rectification unit;
Power supply after buck is changed supplies power at first for the pio chip current supply circuit, starts output constant current voltage regulation unit and carries out work, meets the demands to guarantee supply LED operating current and voltage;
The variation of output parameter can be reflected into output constant current voltage regulation unit, feeds back to the PWM drive IC through optocoupler, with the pwm control signal of change PWM switching circuit, thus electric current and voltage on the control LED.
Wherein, dimming control unit partly is the key of the utility model, through the dimming control unit part, can change the pwm control signal of drive IC, thereby changes the electric current and the voltage of output circuit, and guarantees that light output changes according to favorable linearity.
The above is merely the preferred embodiment of the utility model, and all equalizations of being done according to the utility model claim scope change and modify, and all should belong to the covering scope of the utility model claim.
Claims (7)
1. a track is used from the dimming LED (Light Emitting Diode) driving power, is electrically connected led light source, comprises that output is electrically connected successively from being input to:
AC rectification unit: be used for alternating current is converted into Rectified alternating current;
PWM chip for driving, PWM chip for driving working cell and PWM driving switch unit: PWM driving switch unit carries out copped wave to the Rectified alternating current of rectification circuit output, and the width of this copped wave and frequency receive the control of PWM chip for driving;
Voltage transformation rectification unit: be used for being converted into low pressure PWM power supply to the PWM power supply after the copped wave;
Output constant current voltage regulation unit: be used for the PWM power supply of output is carried out current/voltage control;
It is characterized in that, also comprise:
Dimming control unit: being used for of being electrically connected with said PWM chip for driving adjusted the dimming control signal of said chip for driving.
2.
.According to the said driving power of claim 1, it is characterized in that, also comprise the EMC unit that is connected electrically between input and the said direct current rectification unit.
3.
.According to the said driving power of claim 1, it is characterized in that, also comprise the working power indicating member that is electrically connected with said direct current rectification unit.
4.
.According to the said driving power of claim 3, it is characterized in that said working power indicating member comprises one or more light-emitting diode.
5.
.According to the said driving power of claim 1, it is characterized in that, also comprise the output control chip working cell that is connected electrically between said voltage transformation rectification unit and the output constant current voltage regulation unit.
6.
.According to the said driving power of claim 5, it is characterized in that, also comprise the over-temperature protection unit that is electrically connected with the work of said output control chip.
7. according to the said driving power of claim 1; It is characterized in that; Said dimming control unit comprises PNP triode (Q4) and NPN triode (Q3); Wherein: said PNP triode (Q4) emitter is electrically connected said NPN triode (Q3) collector electrode, and said PNP triode (Q4) collector electrode is electrically connected said NPN triode (Q3) base stage, and the slide head of second by-pass cock (RW2) is electrically connected said PNP triode (Q4) collector electrode; Said PNP triode (Q4) emitter also is electrically connected said PNP triode (Q4) collector electrode through first by-pass cock (RW1), and the slide head of first by-pass cock (RW1) is electrically connected said PNP triode (Q4) base stage; Said PNP triode (Q4) base stage is electrically connected said PNP triode (Q4) collector electrode through electric capacity (C13), also is electrically connected said PNP triode (Q4) emitter through the 29 resistance (R29); Said NPN triode (Q3) collector electrode is electrically connected said NPN triode (Q3) emitter through the 26 resistance (R26).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120282962U CN202135380U (en) | 2011-08-05 | 2011-08-05 | Track-used self-dimming LED drive power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120282962U CN202135380U (en) | 2011-08-05 | 2011-08-05 | Track-used self-dimming LED drive power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202135380U true CN202135380U (en) | 2012-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120282962U Expired - Lifetime CN202135380U (en) | 2011-08-05 | 2011-08-05 | Track-used self-dimming LED drive power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202135380U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107148111A (en) * | 2017-05-26 | 2017-09-08 | 东莞华明灯具有限公司 | A kind of LED control circuit of multiple-channel output |
| CN107676751A (en) * | 2017-09-26 | 2018-02-09 | 研奥电气股份有限公司深圳研发中心 | A kind of light-control knob used on track train |
-
2011
- 2011-08-05 CN CN201120282962U patent/CN202135380U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107148111A (en) * | 2017-05-26 | 2017-09-08 | 东莞华明灯具有限公司 | A kind of LED control circuit of multiple-channel output |
| CN107676751A (en) * | 2017-09-26 | 2018-02-09 | 研奥电气股份有限公司深圳研发中心 | A kind of light-control knob used on track train |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120201 |
|
| CX01 | Expiry of patent term |