CN204206525U - A kind of high brightness Universal LED drive circuit - Google Patents
A kind of high brightness Universal LED drive circuit Download PDFInfo
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- CN204206525U CN204206525U CN201420458751.3U CN201420458751U CN204206525U CN 204206525 U CN204206525 U CN 204206525U CN 201420458751 U CN201420458751 U CN 201420458751U CN 204206525 U CN204206525 U CN 204206525U
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Abstract
The utility model discloses a kind of high brightness Universal LED drive circuit, comprise integrated IC, voltage follower circuit unit, LED group, in circuit, the VIN pin of described integrated IC is connected with power input; Described voltage follower circuit unit comprises resistance R2, metal-oxide-semiconductor Q1, diode D1, inductance L 1, electric capacity C3, described diode D1, electric capacity C3, inductance L 1 are in series into a closed-loop path successively, described resistance R2 connects with metal-oxide-semiconductor Q1, wherein, the grid of metal-oxide-semiconductor Q1 is connected with the GATE pin of integrated IC, drain electrode is connected with the anode of diode D1, and source electrode is also connected with the CS pin of integrated IC; Described LED group and electric capacity C3 are in parallel.This high brightness Universal LED drive circuit control mode is simple, avoids the impact because current fluctuation causes the brightness of LED string and life-span, also significantly can reduce the overall power of IC.
Description
Technical field
The utility model relates to electronic technology field, particularly relates to a kind of high brightness Universal LED drive circuit.
Background technology
Drive circuit is the important component part of LED application product, the driving of LED string has very strict voltage and current requirement, will according to the annexation feature of various LED string, select suitable driving voltage and electric current, the syndeton of different LED strings, need the different driving voltage of coupling and electric current, slightly fluctuate and all likely damage LED string.Meanwhile, LED is the product of DC driven, exchanging the occasion driven, first will convert alternating voltage to direct voltage, and then becoming the voltage of suitable LED strip, in a lot of field, also needing to carry out light modulation to LED, change the brightness of LED string.
Utility model content
The utility model, in order to overcome the deficiencies in the prior art, provides a kind of high brightness Universal LED drive circuit, and this circuit can realize the automatic control to LED driving voltage and electric current; AC voltage is become the DC voltage of applicable LED string; The drive current of adjustment LED string; Reduce the power consumption of IC itself.
In order to solve above-mentioned technical problem, basic solution technical scheme of the present utility model is:
A kind of high brightness Universal LED drive circuit, comprise integrated IC, voltage follower circuit unit, LED group, in circuit, the VIN pin of described integrated IC is connected with power input; Described voltage follower circuit unit comprises resistance R2, metal-oxide-semiconductor Q1, diode D1, inductance L 1, electric capacity C3, described diode D1, electric capacity C3, inductance L 1 are in series into a closed-loop path successively, described resistance R2 connects with metal-oxide-semiconductor Q1, wherein, the grid of metal-oxide-semiconductor Q1 is connected with the GATE pin of integrated IC, drain electrode is connected with the anode of diode D1, and source electrode is also connected with the CS pin of integrated IC; Described LED group and electric capacity C3 are in parallel.
Further, the VIN pin of integrated IC also and be connected with an electric capacity C1, for the input voltage of stabilized power supply; The VDD pin of integrated IC, LD pin are connected to an electric capacity C2 altogether, for stable LED crosstalk pressure.The RT pin of integrated IC is connected with the resistance R1 of a ground connection, for regulating the turn-off time of metal-oxide-semiconductor Q1.
In addition, the GND pin ground connection of integrated IC, PWMD pin can be accessed by outside PWM dim signal, is used for regulating the brightness of LED string.
The beneficial effects of the utility model are:
1: because Vin holds the direct voltage that can bear up to 600V, so general AC voltage is after rectifying and wave-filtering, directly can be connected on this pin, eliminates loaded down with trivial details control device;
2: because the electric current flowing through LED string is that the mode compared by the voltage of the pressure drop on current sense resistor and internal comparator is set, and the reference voltage of internal comparator is more accurate, therefore make the electric current flowing through LED string obtain accurate setting, avoid the impact because current fluctuation causes the brightness of LED string and life-span.
3: because this integrated circuit does not have integrated power MOS, but MOS has been placed on the outside of IC, so so, the overall power of IC obtains good control, user is so also made to be convenient to according to different LED power needs, select different MOSs, bring the convenience of use.
Accompanying drawing explanation
Fig. 1 is a kind of high brightness Universal LED of the utility model drive circuit circuit diagram;
Fig. 2 is the pin configuration figure of integrated IC in the utility model.
Embodiment
Below with reference to accompanying drawing 1, Fig. 2, the utility model is described further, but protection range of the present utility model should not be limited with this.
For convenience of description and understand the technical solution of the utility model, below illustrate that the orientation that the noun of locality used all is shown with accompanying drawing is as the criterion.
As shown in Figure 1, a kind of high brightness Universal LED drive circuit, comprises integrated IC, voltage follower circuit unit, LED group, and in circuit, the VIN pin of described integrated IC is connected with power input; Described voltage follower circuit unit comprises resistance R2, metal-oxide-semiconductor Q1, diode D1, inductance L 1, electric capacity C3, described diode D1, electric capacity C3, inductance L 1 are in series into a closed-loop path successively, described resistance R2 connects with metal-oxide-semiconductor Q1, wherein, the grid of metal-oxide-semiconductor Q1 is connected with the GATE pin of integrated IC, drain electrode is connected with the anode of diode D1, and source electrode is also connected with the CS pin of integrated IC; Described LED group and electric capacity C3 are in parallel.
More detailed description, the VIN pin of integrated IC is also and be connected with an electric capacity C1, for the input voltage of stabilized power supply; The VDD pin of integrated IC, LD pin are connected to an electric capacity C2 altogether, for stable LED crosstalk pressure.The RT pin of integrated IC is connected with the resistance R1 of a ground connection, for regulating the turn-off time of metal-oxide-semiconductor Q1.
In addition, the GND pin ground connection of integrated IC, PWMD pin can be accessed by outside PWM dim signal, is used for regulating the brightness of LED string.
Below this circuit and control principle are described:
Circuit illustrates:
This circuit working is on off state, and the turn-off time of MOS is arranged by the resistance R1 of outside, by GATE pin output switching signal, controls the switch of outside MOS.
When MOS opens, electric current from Vdd through LED string, inductance, MOS, R2 are to ground, electric current on LED linearly rises, when electric current rise to be enough to allow the pressure drop on R2 equal pressure drop (0.25V) of internal comparator time, internal control signal exports cut-off signals, turns off outside MOS, in this process, inductance is by storage power;
When MOS turns off, electric current will not flow out from VCC, and changing is provided by inductance, now owing to storing energy in inductance, so when outside MOS turns off, inductance will produce induced electromotive force, this electromotive force is by external generation current, and this electric current flows to LED strip through diode D1, provides electric current to LED strip.
Wherein, the acting as of each element in figure:
Electric capacity C1, C2, C3: stablize input voltage, LED crosstalk pressure, and inner linear supply voltage, be generally a few uF to tens uF;
LED strip: luminous lighting, display use, needs to be selected voluntarily by client according to brightness, maximumly connects hundred LED strings;
Power inductance L1: energy storage use, to ensure in the outside MOS down periods: there is electric current to flow through LED, chooses according to the current value that client needs, is generally 2mH--4.7mH;
Diode D1: afterflow use, MOS open time, electric current not from diode process, MOS close time, for the electric current on inductance provides current path, for LED strip provides electric current.
Metal-oxide-semiconductor Q1: on-off action.
Control principle:
PWM light modulation: PWM light modulation is realized by low frequency pwm signal PWMD end being applied to certain duty ratio, and this pwm signal peak frequency can reach a few KHz.When pwm signal is low-voltage, no current in LED, when pwm signal is high voltage, in LED, electric current normally exports.By regulating the duty ratio of pwm signal, also correspondingly with the frequency of pwm signal and duty ratio output current discontinuously in LED, thus make human eye perceives to brightness change.
PFM controls: linearity light adjusting is by regulating the change of the direct voltage put on LD end, thus realize regulating to output peak current, if LD terminal voltage is between 0 ~ 250mV, then export peak current and become Iled=Vld/R2*1000 (mA), the peak current that different direct voltages is corresponding different, thus realize the adjustment to LED luminance.
Note, if the voltage of LD is higher than 250mV, can not output current be changed.
Below in conjunction with Fig. 2, the pin of MOSFET in this circuit is described:
Vin (1): external power input.
CS (2): LED crosstalk stream sampling end, the peak current of LED is detected by this pin.
GND (3): earth terminal.
GATE (4): the drive end of outside MOS, controls the switch of outside MOS.
PWMD (5): outside PWM dim signal input, outside PWM dim signal is connected on this pin, and be used for regulating the brightness of LED string, this pin also can, as the Enable Pin of IC, be used for closing IC.
Vdd (6): inner linear power output end, inside can produce a 7.3V linear power supply, exports from this pin.
LD (7): linearity light adjusting control pin, outside linearity light adjusting signal inputs from this pin, is used for regulating the brightness of LED string.
RT (8): turn-off time programming pin, adjusts the turn-off time of outside MOS by connecting a non-essential resistance, thus the electric current of control LED.
The announcement of book and instruction according to the above description, the utility model those skilled in the art can also change above-mentioned execution mode and revise.Therefore, the utility model is not limited to embodiment disclosed and described above, also should fall in the protection range of claim of the present utility model modifications and changes more of the present utility model.In addition, although employ some specific terms in this specification, these terms just for convenience of description, do not form any restriction to the utility model.
Claims (4)
1. a high brightness Universal LED drive circuit, comprises integrated IC, voltage follower circuit unit, LED group, it is characterized in that, the VIN pin of described integrated IC is connected with power input; Described voltage follower circuit unit comprises resistance R2, metal-oxide-semiconductor Q1, diode D1, inductance L 1, electric capacity C3, described diode D1, electric capacity C3, inductance L 1 are in series into a closed-loop path successively, described resistance R2 connects with metal-oxide-semiconductor Q1, wherein, the grid of metal-oxide-semiconductor Q1 is connected with the GATE pin of integrated IC, drain electrode is connected with the anode of diode D1, and source electrode is also connected with the CS pin of integrated IC; Described LED group and electric capacity C3 are in parallel.
2. a kind of high brightness Universal LED drive circuit as claimed in claim 1, is characterized in that, the VIN pin of described integrated IC is also parallel with an electric capacity C1.
3. a kind of high brightness Universal LED drive circuit as claimed in claim 1, it is characterized in that, the VDD pin of described integrated IC, LD pin are connected to an electric capacity C2 altogether.
4. a kind of high brightness Universal LED drive circuit as claimed in claim 1, is characterized in that, the RT pin of described integrated IC is connected with the resistance R1 of a ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420458751.3U CN204206525U (en) | 2014-08-14 | 2014-08-14 | A kind of high brightness Universal LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420458751.3U CN204206525U (en) | 2014-08-14 | 2014-08-14 | A kind of high brightness Universal LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204206525U true CN204206525U (en) | 2015-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420458751.3U Expired - Fee Related CN204206525U (en) | 2014-08-14 | 2014-08-14 | A kind of high brightness Universal LED drive circuit |
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| CN (1) | CN204206525U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809830A (en) * | 2017-12-06 | 2018-03-16 | 无锡恒芯微科技有限公司 | A kind of Buck boost LED drive circuits |
-
2014
- 2014-08-14 CN CN201420458751.3U patent/CN204206525U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809830A (en) * | 2017-12-06 | 2018-03-16 | 无锡恒芯微科技有限公司 | A kind of Buck boost LED drive circuits |
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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: 20150311 Termination date: 20160814 |