CN203691712U - LED driving power source - Google Patents
LED driving power source Download PDFInfo
- Publication number
- CN203691712U CN203691712U CN201420023178.3U CN201420023178U CN203691712U CN 203691712 U CN203691712 U CN 203691712U CN 201420023178 U CN201420023178 U CN 201420023178U CN 203691712 U CN203691712 U CN 203691712U
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- CN
- China
- Prior art keywords
- resistance
- operational amplifier
- driving power
- triode
- inductance
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model discloses an LED driving power source. The LED driving power source comprises a direct current power source, a switch tube, a freewheeling diode, an inductor, a difference integrating circuit module, a subtracter module, a triode and an emitter electrode resistor, wherein two input ends of the difference integrating circuit module are respectively connected with two ends of the inductor, a positive phase input end of the subtracter module is connected with the direct current power source, a reverse phase input end of the subtracter module is connected with an output end of the difference integrating circuit module, a base electrode of the triode is connected with an output end of the subtracter module, an emitter electrode of the triode is connected with the reverse phase input end of the subtracter module and is further connected with the direct current power source, and a collector electrode of the triode is connected with a first port of an LED lamp set. The LED driving power source can effectively filter the ripple current and further can improve reliability.
Description
Technical field
The utility model relates to automobile light-emitting diode (being called for short LED) power technology, specially refers to a kind of LED driving power.
Background technology
LED is due to its unique electrical characteristic, and needing special driving power is its power supply.Great power LED adopts Switching Power Supply to drive conventionally at present, and a kind of traditional LED driving power circuit as shown in Figure 1, comprising:
DC power supply, switch, filter inductance, filter capacitor, fly-wheel diode; Traditional Switching Power Supply can produce larger ripple current, and light efficiency and the light decay of ripple current to LED has a negative impact.And the electrochemical capacitor that is used as filter capacitor in conventional ADS driving supply unit is the short slab of restriction Switching Power Supply reliability, and its life-span does not mate with the life-span utmost point of LED itself; In addition the existence of electrochemical capacitor can affect the miniaturization of driving power, integrated and integral layout.
Therefore, prior art is improved traditional LED driving power, to improving its ripple filtering ability and reliability:
The one, by increasing auxiliary circuit, optimize topological structure, use little electric capacity just can reach the filtering requirements that LED drives.The different qualities of these a few class electric capacity based on conventional at present puts forward.As shown in Table 1, although the capacity of polyester capacitance and ceramic condenser is much smaller compared with electrochemical capacitor, can reach their useful life more than 100,000 hours, can improve reliability and the life-span of driving power, make it to match with LED.
The parameter comparison of several different electric capacity of table 1
| Capacity type | Capacity | Life-span (hour) | Heap(ed) capacity density |
| Electrochemical capacitor | 1uF～12mF | <10,000 | 200μF/cm 3 |
| Polyester capacitance | 10pF～80μF | >100,000 | 30μF/cm 3 |
| Ceramic condenser | 10pF～10μF | >100,000 | 5μF/cm 3 |
The 2nd, the driving power of the major-minor structure of employing, compensates circuit ripple current.By detecting main circuit output current, adopt an auxiliary induction and an auxiliary capacitor to form auxiliary circuit, the switch of the switch of auxiliary circuit and driving power main circuit is controlled it by anti-phase switching pulse respectively and is switched on and off, export a reverse ripple current by auxiliary circuit the electric current of main circuit is compensated, as shown in Figure 2.The problem of this kind of scheme is, the Synchronization Control of circuit is difficult to solve.
As shown in Figure 3, it has used a coupling coil to replace filter inductance and the auxiliary induction in described driving power to a kind of improvement project of the driving power of major-minor structure.In this, scheme can overcome the Synchronization Control problem of circuit, but the Mutual Inductance Coupling coefficient of coupling coil is had to very high requirement.
The problem of the such scheme of prior art is, can not well realize the filtering of the ripple current to Switching Power Supply, adopts the mode of capacitor filtering to be unfavorable for the reliability of driving power simultaneously.
Utility model content
In view of this, the utility model provides a kind of LED driving power, the problem existing to solve prior art.
The technical solution of the utility model comprises:
A kind of LED driving power, comprises DC power supply, switching tube, fly-wheel diode, inductance; Described driving power also comprises:
Difference product parallel circuit module; Subtracter block; Triode; Emitter resistance;
The inverting input of described difference product parallel circuit module is connected to the first port of described inductance; The normal phase input end of described difference product parallel circuit module is connected to the second port of described inductance;
The normal phase input end of described subtracter block is connected to described DC power supply, and the inverting input of described subtracter block is connected to the output of described difference product parallel circuit module;
The base stage of described triode is connected to the output of described subtracter block; The emitter-base bandgap grading of described triode is connected to the inverting input of subtracter block, and the emitter-base bandgap grading of described triode is connected to described DC power supply by described emitter resistance; The collector electrode of described triode is connected to the first port of described LED lamp group.
Further, described difference product parallel circuit module comprises:
The first operational amplifier, the first resistance, the second resistance, the first electric capacity, the second electric capacity;
The inverting input of described the first operational amplifier is connected to the first port of described inductance by described the first resistance; The normal phase input end of described the first operational amplifier is connected to the second port of described inductance by described the second resistance;
The inverting input of described the first operational amplifier is connected to the output of described the first operational amplifier by described the first electric capacity;
The normal phase input end of described the first operational amplifier is by described the second capacity earth;
The output of described the first operational amplifier is connected to the inverting input of described subtracter block.
Further, described subtracter block comprises:
The second operational amplifier, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance;
The normal phase input end of described the second operational amplifier is connected to described DC power supply by described the 3rd resistance;
The normal phase input end of described the second operational amplifier is by described the 5th grounding through resistance;
The inverting input of described the second operational amplifier is connected to the output of described the first operational amplifier by described the 4th resistance;
The inverting input of described the second operational amplifier is connected to the emitter-base bandgap grading of described triode by described the 6th resistance;
The output of described the second operational amplifier is connected to the base stage of described triode.
Further, described the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance have identical resistance value R;
Described the first electric capacity and described the second electric capacity have identical capacitance C.
Preferably, described resistance value R and described capacitance C meet:
Wherein, described R
tfor the resistance value of described emitter resistance; Described β is that described triode common emitter exchanges amplification coefficient; Described L is the inductance value of described inductance.
LED driving power of the present utility model has removed the filter capacitor using in prior art, eliminates output ripple by the mode of linear current amplifier active compensation.Compared with prior art, can more effective realization the filtering of ripple current to Switching Power Supply, improved the reliability of LED driving power simultaneously.
Accompanying drawing explanation
Fig. 1 is prior art LED driving power structural representation;
Fig. 2 is the LED driving power structural representation that adopts major-minor structure;
Fig. 3 is the LED driving power structural representation that adopts coupling coil;
Fig. 4 is a kind of embodiment structural representation of the utility model LED driving power;
Embodiment
Be described with reference to the accompanying drawings the technical solution of the utility model below by specific embodiment in order better to illustrate.
Referring to Fig. 4, Fig. 4 shows a kind of preferred embodiment of the utility model LED driving power, and as shown in Figure 4, described driving power comprises:
DC power supply U
in, switching tube S, inductance L 1, sustained diode composition switching power circuit, for LED lamp group provides driving power;
The first port of described inductance L 1 is connected to DC power supply U by described switching tube S
in, its second port is connected to the first port of described LED lamp group;
The second port ground connection of described LED lamp group;
The two ends of described sustained diode are connected respectively to the first port of described inductance L 1 and the second port of described LED lamp group;
Described power supply also comprises:
Difference product parallel circuit module; Subtracter block; Triode T; Emitter resistance R
t;
The inverting input of described difference product parallel circuit module is connected to the first port of described inductance L 1; The normal phase input end of described difference product parallel circuit module is connected to the second port of described inductance L 1;
The normal phase input end of described subtracter block is connected to described U
in, the inverting input of described subtracter block is connected to the output of described difference product parallel circuit module;
The base stage of described T is connected to the output of described subtracter block; The emitter-base bandgap grading of described T is connected to the inverting input of subtracter block, and the emitter-base bandgap grading of described T is by described R
tbe connected to described U
in; The collector electrode of described T is connected to the first port of described LED lamp group.
As the preferred implementation of one of the utility model LED driving power embodiment, described difference product parallel circuit module may further include:
The first operational amplifier A 1, the first resistance R 1, the second resistance R 2, the first capacitor C 1, the second capacitor C 2;
The inverting input of described A1 is connected to the first port of described L by described R1; The normal phase input end of described A1 is connected to the second port of described L by described R2;
The inverting input of described A1 is connected to the output of described A1 by described C1;
The normal phase input end of described A1 is by described C2 ground connection;
The output of described A1 is connected to the inverting input of described subtracter block.
As another preferred implementation of the utility model LED driving power embodiment, described subtracter block may further include:
The second operational amplifier A 2, the three resistance R 3, the four resistance R 4, the five resistance R 5, the six resistance R 6;
The normal phase input end of described A2 is connected to described U by described R3
in;
The normal phase input end of described A2 is by described R5 ground connection;
The inverting input of described A2 is connected to the output of described A1 by described R4;
The inverting input of described A2 is connected to the emitter-base bandgap grading of described T by described R6;
The output of described A2 is connected to the base stage of described T.
Wherein, described R1, R2, R3, R4, R5, the resistance value of R6 is R; The resistance value of described C1 and C2 is C.
The technical scheme of the utility model embodiment has been removed the filter capacitor using in prior art, eliminates output ripple by the mode of linear current amplifier active compensation.Compared with prior art, well realize the filtering of the ripple current to Switching Power Supply, improved the reliability of LED driving power simultaneously.
For the beneficial effect of clearer explanation technical solutions of the utility model, below the operation principle of the utility model device is conducted further description:
For LED driving power, in the time of circuit steady operation, the current i of inductance L 1
l(t) can be decomposed into a DC component I
lwith an alternating current component i
r(t) (ripple current), is expressed as:
I
l(t)=I
l+ i
r(t) formula (1)
Wherein, I
pfor inductive current upward peak; I
pPfor the peak-to-peak value of inductive current;
If inductance ripple current is not compensated, be inductive current by the electric current of LED, contain ripple composition, will affect the luminous mass of LED, and can accelerate the light decay of LED.
Triode T is operated in linear magnifying state, its collector current i
c(t) (, offset current) can decompose a DC component I equally
cwith an alternating current component i
m(t), be expressed as:
I
c(t)=I
c+ i
m(t) formula (3)
, flow through the current i of LED lamp group
o(t) be i
land i (t)
c(t) stack, is expressed as:
I
o(t)=i
l(t)+i
c(t)=I
l+ I
c+ i
r(t)+i
m(t) formula (4)
The voltage u at described L two ends
lfor:
Wherein L is the inductance value of described inductance L 1;
, the magnitude of voltage u of described A1 output
o1(t) be:
Wherein, I
pPfor the peak-to-peak value of inductive current;
, described A2 output end voltage value u
o2(t) be:
U
o2(t)=U-U
eB-u
o1(t) formula (9)
Wherein U
eBfor the voltage between emitter-base bandgap grading and the base stage of described T; U is described U
inthe magnitude of voltage providing;
Wherein, the common emitter that β is described T exchanges amplification coefficient; Described R
tfor R
tresistance value;
From above-mentioned formula, can draw, by selecting suitable R, R
t, β and C, under optimal situation, can make:
One of ordinary skill in the art obviously should be known and be understood, the present invention for above embodiment only for the utility model is described, and be not limited to the utility model.In the situation that not deviating from spirit of the present utility model and essence thereof, those skilled in the art are when making various corresponding changes or distortion according to the utility model, but these corresponding changes or distortion all belong to claim protection range of the present utility model.
Claims (5)
1. a LED driving power, comprises, DC power supply, switching tube, fly-wheel diode, inductance, is characterized in that, described driving power also comprises:
Difference product parallel circuit module; Subtracter block; Triode; Emitter resistance;
The inverting input of described difference product parallel circuit module is connected to the first port of described inductance; The normal phase input end of described difference product parallel circuit module is connected to the second port of described inductance;
The normal phase input end of described subtracter block is connected to described DC power supply, and the inverting input of described subtracter block is connected to the output of described difference product parallel circuit module;
The base stage of described triode is connected to the output of described subtracter block; The emitter-base bandgap grading of described triode is connected to the inverting input of subtracter block, and the emitter-base bandgap grading of described triode is connected to described DC power supply by described emitter resistance; The collector electrode of described triode is connected to the first port of described LED lamp group.
2. LED driving power according to claim 1, is characterized in that, described difference product parallel circuit module comprises:
The first operational amplifier, the first resistance, the second resistance, the first electric capacity, the second electric capacity;
The inverting input of described the first operational amplifier is connected to the first port of described inductance by described the first resistance; The normal phase input end of described the first operational amplifier is connected to the second port of described inductance by described the second resistance;
The inverting input of described the first operational amplifier is connected to the output of described the first operational amplifier by described the first electric capacity;
The normal phase input end of described the first operational amplifier is by described the second capacity earth;
The output of described the first operational amplifier is connected to the inverting input of described subtracter block.
3. LED driving power according to claim 2, is characterized in that, described subtracter block comprises:
The second operational amplifier, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance;
The normal phase input end of described the second operational amplifier is connected to described DC power supply by described the 3rd resistance;
The normal phase input end of described the second operational amplifier is by described the 5th grounding through resistance;
The inverting input of described the second operational amplifier is connected to the output of described the first operational amplifier by described the 4th resistance;
The inverting input of described the second operational amplifier is connected to the emitter-base bandgap grading of described triode by described the 6th resistance;
The output of described the second operational amplifier is connected to the base stage of described triode.
4. LED driving power according to claim 3, is characterized in that:
Described the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance have identical resistance value R;
Described the first electric capacity and described the second electric capacity have identical capacitance C.
5. LED driving power according to claim 4, is characterized in that:
Described resistance value R and described capacitance C meet:
Wherein, described R
tfor the resistance value of described emitter resistance; Described β is that described triode common emitter exchanges amplification coefficient; Described L is the inductance value of described inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420023178.3U CN203691712U (en) | 2014-01-15 | 2014-01-15 | LED driving power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420023178.3U CN203691712U (en) | 2014-01-15 | 2014-01-15 | LED driving power source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203691712U true CN203691712U (en) | 2014-07-02 |
Family
ID=51013560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420023178.3U Expired - Fee Related CN203691712U (en) | 2014-01-15 | 2014-01-15 | LED driving power source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203691712U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617224A (en) * | 2018-12-04 | 2019-04-12 | 中车大连机车研究所有限公司 | A kind of train intelligent control system redundant power |
-
2014
- 2014-01-15 CN CN201420023178.3U patent/CN203691712U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617224A (en) * | 2018-12-04 | 2019-04-12 | 中车大连机车研究所有限公司 | A kind of train intelligent control system redundant power |
| CN109617224B (en) * | 2018-12-04 | 2022-04-26 | 中车大连机车研究所有限公司 | Redundant power supply of train intelligent control system |
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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 |
Granted publication date: 20140702 Termination date: 20160115 |
|
| EXPY | Termination of patent right or utility model |