CN205657888U - Auxiliary power circuit , LED drive circuit , LED driver - Google Patents
Auxiliary power circuit , LED drive circuit , LED driver Download PDFInfo
- Publication number
- CN205657888U CN205657888U CN201620452428.4U CN201620452428U CN205657888U CN 205657888 U CN205657888 U CN 205657888U CN 201620452428 U CN201620452428 U CN 201620452428U CN 205657888 U CN205657888 U CN 205657888U
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- Prior art keywords
- led
- led drive
- oxide
- metal
- semiconductor
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- 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.)
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Abstract
Auxiliary power circuit, LED drive circuit, LED driver belongs to the switching power supply technology field. The utility model discloses auxiliary power circuit includes input, output, a MOS pipe, steady voltage unit, feedback branch, steady voltage branch road, the input is connected a MOS manages the drain electrode, MOS pipe gate pole is connected voltage stabilizing circuit, output and warp are connected respectively to MOS pipe source electrode feedback branch ground connection, feedback branch connects the steady voltage unit, the output with be connected with the steady voltage branch road between the feedback branch. The utility model discloses LED drive circuit includes above -mentioned auxiliary power circuit, steady voltage unit replacement among the auxiliary power circuit is LED drive module. The utility model discloses the LED driver includes above -mentioned LED drive circuit. The utility model discloses simple structure, low cost, it is small, the LED driver auxiliary electrical power source function that can integrate controls not only that the LED lamp is bright to go out, still need not extra chip or complex circuit and just can supply power for other equipment.
Description
Technical field
This utility model belongs to switch power technology field, particularly relate to a kind of auxiliary power circuit, LED drive circuit,
LED driver.
Background technology
LED is modified to be applied in various occasions.LED is powered use constant current because the brightness of LED with flow through
Its electric current is proportional.When constant voltage is applied in LED, target constant voltage once occur to deviate a little will make defeated
Going out electric current generation to deviate significantly from, this is to be determined by the non-linear I-V characteristic of LED, and the big deviation of electric current simultaneously causes brightness to occur
Big change, it is therefore desirable to controller effectively controls brightness according to LED characteristic.
But some application scenario of LED, equipment such as microcontroller, audio frequency apparatus, transceiver, motion detector, luminosity sense
Answer device and other controllers to remain a need for constant voltage to power.While LED controller controls LED light on and off, in addition it is also necessary to obtain
AC-DC constant voltage source is that other controllers are powered, then some complicated circuits are introduced into composition transducer, as shown in Figure 1.More very
Person, is additionally added, in these complicated circuits, transformator of knowing clearly so that whole circuit cost is greatly improved and circuit volume becomes big.
Utility model content
In order to solve above-mentioned technical problem, the purpose of this utility model is to provide one can control LED light on and off, again can
Meet other controller constant voltages to power, the LED driver that simple in construction, low cost, volume are little, and driving for LED
Galvanic electricity road, auxiliary power circuit.
This utility model provides a kind of LED drive circuit, drives mould including input, outfan, the first metal-oxide-semiconductor, LED
Block, feedback branch, voltage stabilizing branch road；Described input connects described first metal-oxide-semiconductor drain electrode, and described first metal-oxide-semiconductor gate pole connects institute
Stating LED drive module, described first metal-oxide-semiconductor source electrode connects outfan and respectively through described feedback branch ground connection；Described feedback is propped up
Road connects described LED drive module；It is connected between described outfan with described feedback branch and has voltage stabilizing branch road.
This LED drive circuit exports constant voltage through LED drive module.
As preferably, described LED drive module is integrated with energy supply control module, or described LED drive module includes integrated
There is the LED controller of energy supply control module.
As preferably, described feedback branch includes two series resistances；Company between described voltage regulation unit and two resistance
Line connects.
As preferably, described voltage stabilizing branch road includes ground capacity.
As preferably, described first metal-oxide-semiconductor can replace with BJT pipe or IBGT pipe.
This utility model also provides for a kind of LED driver, including above-mentioned LED drive circuit.
LED driver utilizes the above-mentioned LED drive circuit being integrated with energy supply control module, can control LED light on and off, simultaneously
Output constant voltage power supply to the device, it is not necessary to power supply chip or other complicated power supply circuits are additionally set, reduce in driver
Amount of parts, and then reduce volume, decrease wiring, greatly reduce cost, improve the work of LED driver
Efficiency.
As preferably, LED driver also includes the second metal-oxide-semiconductor, LED array, diode, inductance, the first electric capacity, the first electricity
Resistance；Described second metal-oxide-semiconductor gate pole and source electrode are connected with described LED drive module；Described second metal-oxide-semiconductor source electrode connects through the first resistance
Ground；Described second metal-oxide-semiconductor drain electrode connects diode anode and inductance respectively；The negative electrode of LED array and described inductance connection, its sun
Pole is connected input jointly with the negative electrode of diode；Described first electric capacity is in parallel with described LED array；Described LED drive module
Connect input ground connection.
As preferably, described second metal-oxide-semiconductor can replace with BJT pipe or IBGT pipe.
This utility model also provides for a kind of auxiliary power circuit, and including above-mentioned LED drive circuit, wherein said LED drives
Module replaces with voltage regulation unit.
This auxiliary power circuit can be used in LED driver or controller, through voltage regulation unit output constant voltage with supply
Equipment uses.
As preferably, described voltage regulation unit includes operational amplifier；Described operational amplifier have reference voltage input terminal,
The voltage output end connected from feedback signal input terminal and the first metal-oxide-semiconductor gate pole of described feedback circuit.
This utility model has the advantages that
This utility model simple in construction, with low cost, volume is little；LED driver can be integrated with accessory power supply function, not only
Control LED light on and off, just can power for other equipment also without extra chips or complicated circuit.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of the LED driver in prior art with accessory power supply；
Fig. 2 is the circuit block diagram of this utility model auxiliary power circuit；
Fig. 3 is the circuit block diagram of this utility model LED driver.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model is described in further detail.
Such as the circuit block diagram that Fig. 1 is the LED driver in prior art with accessory power supply.The light on and off of this driver control
Powering with constant voltage and completed by two chips respectively, the chip that AC-DC converter is constituted provides constant voltage for equipment, and
The chip constituted including the LED drive circuit of LED controller effectively controls LED light on and off according to LED characteristic.So LED drives
Device needs multiple devices to constitute, and wherein AC-DC converter is typically made up of complicated circuit, if having transformator, the most whole LED drives
Dynamic device is sufficiently bulky, and cost is high, and when it is applied to LED intelligent control system, excessive volume controls heat radiation to LED, efficiency has
The biggest impact.
To this end, this utility model relate to a kind of LED driver being integrated with accessory power supply, see accompanying drawing 3.This practicality is new
Type LED driver include LED drive circuit, the second metal-oxide-semiconductor Q0, LED array, diode D1, inductance L, the first electric capacity C1, first
Resistance R1.Described LED drive circuit includes input Vin, outfan VAUX, the first metal-oxide-semiconductor Q1, LED drive module, feedback prop up
Road, voltage stabilizing branch road.Described input VinConnecting described first metal-oxide-semiconductor Q1 drain electrode, described first metal-oxide-semiconductor Q1 gate pole connects described
LED drive module, described first metal-oxide-semiconductor Q1 source electrode connects outfan V respectivelyAUXWith through described feedback branch ground connection, described feedback
Branch road connects described LED drive module, described outfan VAUXIt is connected with between described feedback branch and has voltage stabilizing branch road.Described
Two metal-oxide-semiconductor Q0 gate poles and source electrode are connected with described LED drive module；Described second metal-oxide-semiconductor source electrode is through the first resistance R1 ground connection；Institute
State the second metal-oxide-semiconductor drain electrode and connect diode anode and inductance respectively；The negative electrode of LED array and described inductance connection, its anode with
The negative electrode of diode connects input jointly；Described first electric capacity is in parallel with described LED array；Described LED drive module connects
Input ground connection.
Wherein, described feedback branch includes two series resistances RFB1、RFB2.Described LED drive module and two resistance
RFB1、RFB2Between line connect, described first metal-oxide-semiconductor Q1 source electrode is sequentially connected with resistance RFB2, resistance RFB1.In order to stablize and protect
Holding constant voltage, described voltage stabilizing branch road includes ground capacity CAUX.Described LED drive module is integrated with energy supply control module, or institute
Stating LED drive module and include being integrated with the LED controller of energy supply control module, this energy supply control module is linear power supply module.
Such as Fig. 3, described LED controllerConnect described first metal-oxide-semiconductor gate pole, described LED controllerConnect electricity
Resistance RFB1、RFB2Between line.Described first metal-oxide-semiconductor, described second metal-oxide-semiconductor all can replace with BJT pipe or IBGT pipe.
When power supply is applied to input VinWith between earth terminal, electric current is from input VinFlow into LED array, described LED battle array
It is classified as multiple light emitting diode to be in series, then flows into inductance L, the second metal-oxide-semiconductor Q0, the first resistance R1 successively.In the process,
The voltage at the first resistance R1 two ends passes through along with electric current, and its voltage is rising.When the voltage of the first resistance R1 exceedes certain value,
Second metal-oxide-semiconductor Q0 turns off, and LED array, inductance, diode constitute current loop.The feedback signal of LED controller output
Being sent to its interior energy supply control module, this energy supply control module controls end pointsMaintain constant voltage VAUX。VAUX
It is equal to。
Above-mentioned LED drive circuit, can be as a kind of for LED driver or the auxiliary power circuit of controller, such as Fig. 2 institute
Show.The parts that described auxiliary power circuit is specifically identical with above-mentioned LED drive circuit, wherein LED drive module replaces with voltage stabilizing
Unit.Described voltage regulation unit includes operational amplifier.Described operational amplifier has reference voltage input terminal, from described feedback
The feedback signal input terminal of circuit, the voltage output end that is connected with the first metal-oxide-semiconductor gate pole.Said structure structure
Become LDO circuit, make end points by controlling the first metal-oxide-semiconductor gate poleEqual with reference voltage, so final VAUXDeng
In。
Embodiment described above is only to be described preferred implementation of the present utility model, not new to this practicality
The spirit and scope of type are defined.On the premise of without departing from this utility model design concept, this area ordinary person is to this
Various modification that the technical scheme of utility model is made and improvement, all should drop into protection domain of the present utility model, this practicality
The novel technology contents being claimed, all records in detail in the claims.
Claims (10)
1.LED drive circuit, it is characterised in that include that input, outfan, the first metal-oxide-semiconductor, LED drive module, feedback are propped up
Road, voltage stabilizing branch road；Described input connects described first metal-oxide-semiconductor drain electrode, and described first metal-oxide-semiconductor gate pole connects described LED and drives
Module, described first metal-oxide-semiconductor source electrode connects outfan and respectively through described feedback branch ground connection；Described feedback branch connects described
LED drive module；It is connected between described outfan with described feedback branch and has voltage stabilizing branch road.
LED drive circuit the most according to claim 1, it is characterised in that described LED drive module is integrated with power supply and controls mould
Block, or described LED drive module includes the LED controller that is integrated with energy supply control module.
LED drive circuit the most according to claim 1, it is characterised in that described feedback branch includes two series resistances；Institute
State the line between voltage regulation unit and two resistance to connect.
LED drive circuit the most according to claim 1, it is characterised in that described voltage stabilizing branch road includes ground capacity.
5. according to the described LED drive circuit of one of claim 1-4, it is characterised in that described first metal-oxide-semiconductor can replace with BJT
Pipe or IBGT pipe.
6.LED driver, it is characterised in that include the LED drive circuit that one of claim 1-5 is described.
LED driver the most according to claim 6, it is characterised in that also include the second metal-oxide-semiconductor, LED array, diode, electricity
Sense, the first electric capacity, the first resistance；Described second metal-oxide-semiconductor gate pole and source electrode are connected with described LED drive module；Described 2nd MOS
Pipe source electrode is through the first resistance eutral grounding；Described second metal-oxide-semiconductor drain electrode connects diode anode and inductance respectively；The negative electrode of LED array
With described inductance connection, its anode is connected input jointly with the negative electrode of diode；Described first electric capacity is with described LED array also
Connection；Described LED drive module connects input ground connection.
LED driver the most according to claim 7, it is characterised in that described second metal-oxide-semiconductor can replace with BJT pipe or
IBGT manages.
9. auxiliary power circuit, it is characterised in that include the LED drive circuit that one of claim 1-5 is described, wherein said
LED drive module replaces with voltage regulation unit.
Auxiliary power circuit the most according to claim 9, it is characterised in that described voltage regulation unit includes operational amplifier；Institute
State operational amplifier and there is reference voltage input terminal, from the feedback signal input terminal of described feedback circuit and the first metal-oxide-semiconductor door
The voltage output end that pole connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620452428.4U CN205657888U (en) | 2016-05-18 | 2016-05-18 | Auxiliary power circuit , LED drive circuit , LED driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620452428.4U CN205657888U (en) | 2016-05-18 | 2016-05-18 | Auxiliary power circuit , LED drive circuit , LED driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205657888U true CN205657888U (en) | 2016-10-19 |
Family
ID=57403810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620452428.4U Withdrawn - After Issue CN205657888U (en) | 2016-05-18 | 2016-05-18 | Auxiliary power circuit , LED drive circuit , LED driver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205657888U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105916241A (en) * | 2016-05-18 | 2016-08-31 | 湖州绿明微电子有限公司 | Auxiliary power supply circuit, LED driving circuit and LED driver |
| CN106851905A (en) * | 2017-01-23 | 2017-06-13 | 福建省云潮智能科技有限公司 | Crest detects circuit and peak detector |
| CN107484295A (en) * | 2017-08-23 | 2017-12-15 | 苏州麦喆思科电子有限公司 | A kind of LED drive circuit |
-
2016
- 2016-05-18 CN CN201620452428.4U patent/CN205657888U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105916241A (en) * | 2016-05-18 | 2016-08-31 | 湖州绿明微电子有限公司 | Auxiliary power supply circuit, LED driving circuit and LED driver |
| CN106851905A (en) * | 2017-01-23 | 2017-06-13 | 福建省云潮智能科技有限公司 | Crest detects circuit and peak detector |
| CN106851905B (en) * | 2017-01-23 | 2018-09-28 | 福建省云潮智能科技有限公司 | Wave crest detection circuit and peak detector |
| CN107484295A (en) * | 2017-08-23 | 2017-12-15 | 苏州麦喆思科电子有限公司 | A kind of LED drive circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20161019 Effective date of abandoning: 20180119 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20161019 Effective date of abandoning: 20180119 |