CN205864803U - The high-brightness LED drive circuit that a kind of civil power directly inputs - Google Patents
The high-brightness LED drive circuit that a kind of civil power directly inputs Download PDFInfo
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- CN205864803U CN205864803U CN201620812751.8U CN201620812751U CN205864803U CN 205864803 U CN205864803 U CN 205864803U CN 201620812751 U CN201620812751 U CN 201620812751U CN 205864803 U CN205864803 U CN 205864803U
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Abstract
The high-brightness LED drive circuit that a kind of civil power directly inputs, it includes control chip, LED group, resistance R1, diode D1, inductance L, electric capacity C1 and field effect transistor Q1, the pin VIN of described control chip is Input voltage terminal, it is connected with voltage source through resistance, pin GATE is connected with the grid of field effect transistor Q1, the drain electrode of field effect transistor Q1 is connected with voltage source through diode D1, source ground, being connected in parallel on the two ends of diode D1 after described inductance L and electric capacity C1 series connection, described LED group is connected in parallel on the two ends of electric capacity C1.Field effect transistor Q1 is controlled with fixed frequency by resistance R1 setup control chip, LED group is reliably driven in the way of constant current, this control chip is by maintaining the electric current of constant LED group to ensure the brightness of light emitting diode and the constant of frequency spectrum, and then extends its service life.
Description
Technical field
This utility model relates to electric field, is specifically related to the high-brightness LED drive circuit that a kind of civil power directly inputs.
Background technology
LED is existing has a good development prospect due to energy-saving and environmental protection, but LED needs drive circuit to make that it is shinny,
Luminescence, as drive circuit, its output electric current is the most stable, and the LED group of driving is the most stable.
Utility model content
In order to solve the problems referred to above, this utility model provides the high-brightness LED drive circuit that a kind of civil power directly inputs:
The high-brightness LED drive circuit that a kind of civil power directly inputs, it include control chip, LED group, resistance R1, two
Pole pipe D1, inductance L, electric capacity C1 and field effect transistor Q1, the pin VIN of described control chip is Input voltage terminal, its through resistance with
Voltage source connects, and pin GATE is connected with the grid of field effect transistor Q1, and the drain electrode of field effect transistor Q1 is through diode D1 and voltage source
Connecting, source ground, be connected in parallel on the two ends of diode D1 after described inductance L and electric capacity C1 series connection, described LED group is connected in parallel on electricity
Hold the two ends of C1.
Being provided with resistance R2, it is connected on the pin CS of described control chip between the source electrode and ground of field effect transistor Q1, institute
The node stated between the pin CS of control chip with the source electrode of field effect transistor Q1 and resistance R2 is connected.
The pin RT of described control chip is through resistance R3 ground connection.
The pin RI of described control chip is through resistance R4 ground connection.
The pin PWMD of described control chip is light modulation end.
The pin LD of described control chip is adjustable side.
Being provided with electric capacity C2, this electric capacity C2 one end is connected with resistance R1, other end ground connection.
This utility model has the advantages that by resistance R1 setup control chip with fixed frequency controlling filed effect
Pipe Q1, reliably drives LED group in the way of constant current, and this control chip can drive several groups of high-brightness LED lamp groups being in parallel,
And each LED group comprises the load of some light emitting diodes, control chip ensures by maintaining the electric current of constant LED group
The brightness of light emitting diode and frequency spectrum constant, and then extend its service life.
Accompanying drawing explanation
Accompanying drawing 1 is circuit theory diagrams of the present utility model.
Accompanying drawing 2 is the internal circuit diagram of this utility model control chip CF7804.
Detailed description of the invention
With embodiment, this utility model is further described below in conjunction with the accompanying drawings.
The high-brightness LED drive circuit that a kind of civil power directly inputs, it includes control chip CF7804, LED group, resistance
R1, diode D1, inductance L, electric capacity C1 and field effect transistor Q1, the pin VIN of described control chip is Input voltage terminal, and it is through electricity
Resistance is connected with voltage source, and pin GATE is connected with the grid of field effect transistor Q1, and the drain electrode of field effect transistor Q1 is through diode D1 and electricity
Potential source connects, source ground, is connected in parallel on the two ends of diode D1 after described inductance L and electric capacity C1 series connection, and described LED group is in parallel
At the two ends of electric capacity C1, control field effect transistor Q1 by resistance R1 setup control chip CF7804 with fixed frequency, with constant current
Mode reliably drives LED group, and this control chip CF7804 can drive several groups of high-brightness LED lamp groups being in parallel, and each
LED group comprises the load of some light emitting diodes, and control chip CF7804 ensures by maintaining the electric current of constant LED group
The brightness of light emitting diode and frequency spectrum constant, and then extend its service life.
Being provided with resistance R2, it is connected on the pin CS of described control chip between the source electrode and ground of field effect transistor Q1, fills
Work as current-limiting resistance, in order to set the electric current of LED group, the pin CS of described control chip and the source electrode of field effect transistor Q1 and resistance
Node between R2 connects, for detecting the electric current of LED group.
Resistance R3 is NTC resistance, and the pin RT of described control chip is temperature sense input, by the resistance R3 of ground connection
Can realize temperature sense, after this temperature is higher than certain value, system can turn off, and LED group can be prevented overheated, thus realize temperature
Protection.After excess temperature situation releases, system can be recovered normally to work again.
The pin RI of described control chip is that oscillator frequency sets end, and it carrys out setpoint frequency by the resistance R4 of ground connection.
What oscillator frequency was random carries out little excursions, thus reduces the noise energy of center spectrum, and then farthest drops
The EMI interference of low passband, alleviates the EMI challenge of system design.
The pin PWMD of described control chip is light modulation end, supports the digit pulse light modulation of low frequency variable duty ratio, controls
Chip CF7804 can carry out PWM light modulation by PWMD end, and for avoiding flicker, light modulating frequency can must be realized higher than people's naked eyes
100Hz.The brightness that naked eyes can be examined is directly proportional to the unlatching dutycycle of dim signal, and the light modulating frequency upper limit is 20KHz.
The pin PWMD of described control chip is also Enable Pin, and when PWM_D end ground connection, control chip CF7804 turns off, this
Time the quiescent current that consumes of control chip CF7804 less than 1mA.
The pin LD of described control chip is adjustable side, and it is linearly adjusted by the threshold values of regulation Current-Limiting Comparator
Light, i.e. applies a control voltage and can regulate and control to flow through the electric current of LED group easily, it is achieved the linear brightness changing LED group
Purpose.
Being provided with electric capacity C2, this electric capacity C2 one end is connected with resistance R1, other end ground connection, utilizes joining of resistance R1 and electric capacity C2
Close, the input range of voltage source is adjusted to 18V to 450V, obtains a relatively wide input voltage range.
This drive circuit is mainly used in DC/DC or AC/DC LED driving, the driving of RGB backlight LED, general constant-current source, LED
In the scene that environment lamp decoration, automobile charger etc. directly pick out from civil power.
Obviously, above-described embodiment of the present utility model is merely to illustrate that this utility model example, and not
Restriction to embodiment of the present utility model.For those of ordinary skill in the field, on the basis of described above
On can also make change or the variation of other multi-forms.Here without also all of embodiment being given poor example.
And these belong to obvious change that connotation of the present utility model amplified out or variation still falls within this utility model
Protection domain.
Claims (7)
1. the high-brightness LED drive circuit that a civil power directly inputs, it is characterised in that: it include control chip, LED group,
Resistance R1, diode D1, inductance L, electric capacity C1 and field effect transistor Q1, the pin VIN of described control chip is Input voltage terminal, its
Being connected with voltage source through resistance, pin GATE is connected with the grid of field effect transistor Q1, and the drain electrode of field effect transistor Q1 is through diode D1
It is connected with voltage source, source ground, after described inductance L and electric capacity C1 series connection, is connected in parallel on the two ends of diode D1, described LED group
It is connected in parallel on the two ends of electric capacity C1.
The high-brightness LED drive circuit that a kind of civil power the most according to claim 1 directly inputs, it is characterised in that: it is provided with
Resistance R2, it is connected on the pin CS of described control chip between the source electrode and ground of field effect transistor Q1, described control chip
Node between pin CS and source electrode and the resistance R2 of field effect transistor Q1 is connected.
The high-brightness LED drive circuit that a kind of civil power the most according to claim 1 directly inputs, it is characterised in that: described
The pin RT of control chip is through resistance R3 ground connection.
The high-brightness LED drive circuit that a kind of civil power the most according to claim 1 directly inputs, it is characterised in that: described
The pin RI of control chip is through resistance R4 ground connection.
The high-brightness LED drive circuit that a kind of civil power the most according to claim 1 directly inputs, it is characterised in that: described
The pin PWMD of control chip is light modulation end.
The high-brightness LED drive circuit that a kind of civil power the most according to claim 1 directly inputs, it is characterised in that: described
The pin LD of control chip is adjustable side.
The high-brightness LED drive circuit that a kind of civil power the most according to claim 1 directly inputs, it is characterised in that: it is provided with
Electric capacity C2, this electric capacity C2 one end is connected with resistance R1, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620812751.8U CN205864803U (en) | 2016-07-18 | 2016-07-18 | The high-brightness LED drive circuit that a kind of civil power directly inputs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620812751.8U CN205864803U (en) | 2016-07-18 | 2016-07-18 | The high-brightness LED drive circuit that a kind of civil power directly inputs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205864803U true CN205864803U (en) | 2017-01-04 |
Family
ID=57653975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620812751.8U Expired - Fee Related CN205864803U (en) | 2016-07-18 | 2016-07-18 | The high-brightness LED drive circuit that a kind of civil power directly inputs |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205864803U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108633143A (en) * | 2018-07-18 | 2018-10-09 | 惠州市烁达德高光电科技有限公司 | A kind of light adjusting circuit of LED light |
-
2016
- 2016-07-18 CN CN201620812751.8U patent/CN205864803U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108633143A (en) * | 2018-07-18 | 2018-10-09 | 惠州市烁达德高光电科技有限公司 | A kind of light adjusting circuit of LED light |
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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: 20170104 Termination date: 20180718 |