CN100571479C - A kind of LED constant-flow driver - Google Patents
A kind of LED constant-flow driver Download PDFInfo
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- CN100571479C CN100571479C CNB2006100263905A CN200610026390A CN100571479C CN 100571479 C CN100571479 C CN 100571479C CN B2006100263905 A CNB2006100263905 A CN B2006100263905A CN 200610026390 A CN200610026390 A CN 200610026390A CN 100571479 C CN100571479 C CN 100571479C
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Abstract
A kind of LED constant-flow driver; the signal of telecommunication is successively through filter circuit; transforming circuit; rectifier filter circuit and current sampling circuit input load; isolate negative-feedback circuit one input and accept the signal of current sampling circuit one output output; another input is accepted the signal of rectifier filter circuit output through the protective circuit input; PWM pulse width control circuit one input accepts to isolate the signal of negative-feedback circuit output; another input is accepted from the signal of another output of transforming circuit through the regenerative circuit input, and the signal of PWM pulse width control circuit output output is through V-MOSFET power switch control transforming circuit.The combination of PWM pulse width control circuit and V-MOSFET power switch not only makes the pulsewidth of the pulse that is produced by PWM adjustable, and its frequency can be adjusted automatically with the variation of load.This driver makes the operating current of the LED that flows through keep constant, and it is less that itself consumes power consumption simultaneously, and environmental protection and energy saving are with low cost.
Description
Technical field
The invention belongs to the power circuit field, be specifically related to a kind of LED constant-flow driver.
Background technology
LED is a kind of energy-saving and environmental protection and long-life new type light source, but it has following electrology characteristic, the little variation that promptly is applied to the voltage on the LED will cause the big variation of the electric current on the LED that flows through, so if its electric current is not limited, then LED will be burnt very easily.Current-limiting mode commonly used at present is LED series limiting resistor and the PWM technology that adopts the IC chip.
There are many deficiencies in the LED series limiting resistor, mainly shows: the LED job insecurity.Current-limiting resistance only plays the effect of dividing potential drop, it can't produce constant electric current, the operating current of LED all is safe even flow through, but LED will follow the variation of electric current and be flickering, the dividing potential drop effect of current-limiting resistance also is limited simultaneously, the operating current that too much still will make LED surpasses safety value if line voltage raises, thereby burns LED.Current-limiting resistance itself will consume big power consumption at work simultaneously, and it is very big to produce heat, and temperature is up to more than 100 degrees centigrade, if the bad security incident that very easily causes of radiating condition.
Adopt the PWM technology of IC chip to have many deficiencies, mainly show: this type of technology only pulsewidth is adjustable and frequency is non-adjustable, and owing to adopt the IC chip, cost is higher.
Summary of the invention
The present invention is exactly for fear of above deficiency, provides a kind of operating current of the LED that flows through that makes to keep constant, and it is less that itself consumes power consumption simultaneously, environmental protection and energy saving and LED constant-flow driver with low cost.
The goal of the invention of a kind of LED constant-flow driver of the present invention can be achieved through the following technical solutions:
A kind of LED constant-flow driver; comprise filter circuit; transforming circuit; rectifier filter circuit; current sampling circuit; protective circuit; isolate negative-feedback circuit; regenerative circuit; PWM pulse width control circuit and V-MOSFET power switch; the signal of telecommunication is successively through filter circuit; transforming circuit; rectifier filter circuit and current sampling circuit input load; isolate negative-feedback circuit one input and accept the signal of current sampling circuit one output output; isolate another input of negative-feedback circuit and accept the signal of rectifier filter circuit output through the protective circuit input; PWM pulse width control circuit one input accepts to isolate the signal of negative-feedback circuit output; another input of PWM pulse width control circuit is accepted from the signal of another output of transforming circuit through the regenerative circuit input, and the signal of PWM pulse width control circuit output output is through V-MOSFET power switch control transforming circuit.
Current sampling circuit comprises a triode Q
2, its base stage is passed through resistance R successively
16And resistance R
14Accept the signal of current rectifying and wave filtering circuit output, its emitter passes through resistance R
11Accept the signal of current rectifying and wave filtering circuit output, its collector electrode passes through resistance R
12And resistance R
13Ground connection.
Protective circuit comprises the resistance R of series connection
15And resistance R
17, resistance R
15Input accept the signal of current rectifying and wave filtering circuit output, resistance R
17Output head grounding, resistance R
15Output and triode Q
2Connect a voltage-stabiliser tube D between the base stage
7
End and triode Q
2Connect a voltage-stabiliser tube D between the base stage
7
Isolating negative-feedback circuit is a photoelectric coupled device.
Pulse width control circuit comprises PWM pulse-width modulation circuit and V-MOSFET power switch.
Filter circuit comprises electromagnetic interface filter, rectifier filter, passes through current-limiting resistance R between electromagnetic interface filter and the rectifier filter respectively
1With negative temperature thermistor R
2Connect, the signal of telecommunication is through electromagnetic interface filter and rectifier filter input transforming circuit.
Transforming circuit comprises the auto-excitation type high frequency transformer.
According to the LED constant-flow driver that above technical scheme proposes, it is constant that the operating current on the LED keeps, and LED works under safe condition all the time, has prolonged the useful life of LED, and the LED working stability can not produce flickering phenomenon simultaneously.The combination of PWM pulse width control circuit and V-MOSFET power switch not only makes the pulsewidth of the pulse that is produced by PWM adjustable, and its frequency can be adjusted automatically with the variation of load.The variation of output is directly controlled by the variation of input pulsewidth and frequency, makes the drive dissipation power consumption less, thereby produces the effect of environmental protection and energy saving.It is integrated that this device adopts the alternative IC of apportion element simultaneously, and product cost is reduced.
Description of drawings
Fig. 1 is a LED constant-flow driver functional-block diagram.
Fig. 2 is a LED constant-flow driver circuit diagram
Embodiment
A kind of LED constant-flow driver comprises filter circuit, transforming circuit, rectifier filter circuit, current sampling circuit, protective circuit, isolation negative-feedback circuit, regenerative circuit, PWM pulse width control circuit and V-MOSFET power switch.Filter circuit comprises electromagnetic interface filter, rectifier filter, passes through current-limiting resistance R between electromagnetic interface filter and the rectifier filter respectively
1With negative temperature thermistor R
2Connect.
Current-limiting resistance R in the filter circuit
1Act as when back level overcurrent, quick-break is in order to avoid the driver sheet burns out.
Negative temperature thermistor R
2Act as when ambient temperature raises, resistance rises, thereby driver output current amplitude is descended, the power consumption of load and driver descends.
Common mode disturbances in the electromagnetic interface filter filtering civil power, noise jamming etc.Obtain a purer power frequency component, AC signal obtains the direct voltage of a high pressure behind rectifying and wave-filtering, for entire circuit provides a DC power supply.Output signal with the PWM modulator drives the auto-excitation type high frequency transformer then.By high frequency transformer, behind rectifying and wave-filtering, produce an out-put supply.
This driver constant current operation principle:
Utilize triode Q
2U
BeConduction voltage drop is always 0.7 volt characteristic, makes it become a recessive benchmark of sample circuit, when acting on Q
2The base stage and the current potential of emitter during less than 0.7 volt, Q
2Do not work, and the no current negative feedback.When acting on Q
2The base stage and the current potential of emitter high more, emitter current is strong more, Q
2The Current Negative Three-Point Capacitance that self produces is strong more, passes through resistance R
11Play the effect that electric current suppresses.While Q
2Emitter current strengthens, and collector current is also strengthened, and photoelectric coupled device U luminous intensity is strengthened, the base current of Q1 is increased, and the collector potential of Q1 descends, and the ON time of PWM is shortened, the energy storage of transformer is reduced, thereby output is reduced, to reach the purpose of constant current.
Course of work when this driver load changes:
When load diminishes, sample circuit Q
2Base potential and emitter current potential raise Q simultaneously
2Emitter and collector current increase, the luminous intensity of photoelectric coupled device U is strengthened, thereby the base current of Q1 is increased, and collector potential descends, and the conducting pulsewidth of PWM is narrowed down, the ON time of V-MOSFET is shortened, frequency gets higher reduces the energy storage of transformer, thereby driver output is reduced, diminish the purpose that current constant is constant to reach output voltage.
When load becomes big, sample circuit Q
2Base potential and emitter current potential descend Q
2Emitter and collector current reduce, the luminous intensity of photoelectric coupled device U is weakened, thereby the base current of Q1 is reduced, and collector potential raises, and the conducting pulsewidth of PWM is broadened, make the ON time of V-MOSFET elongated, frequencies go lower increases the energy storage of transformer, thereby driver output is increased, become big, the purpose that current constant is constant to reach output voltage.
Under the situation of load open circuit overvoltage, the operation principle of protective circuit is:
The output of driver should be by resistance R
15With R
17Dividing potential drop is added the burning voltage 36V of voltage-stabiliser tube, and the starting voltage that forms protection is 75 volts.When open circuit occurring, the transformer energy storage increases, and the output of driver will be above 75V, at this moment voltage-stabiliser tube D
7Breakdown, Q
2Base potential and emitter current potential raise Q simultaneously
2Emitter and collector current increase, the photoelectric coupled device U luminous intensity of isolating negative-feedback circuit is strengthened, the output current of U is increased, make Q
1Base stage and collector current increase, collector potential descends, the grid potential of V-MOSFET descends, and the ON time of V-MOSFET is shortened, and the transformer energy storage is reduced, thereby driver output is reduced, and makes V-MOSFET trend lightly conducting at last.
Claims (7)
1. LED constant-flow driver; it is characterized in that: comprise filter circuit; transforming circuit; rectifier filter circuit; current sampling circuit; protective circuit; isolate negative-feedback circuit; regenerative circuit; PWM pulse width control circuit and V-MOSFET power switch; the signal of telecommunication is successively through filter circuit; transforming circuit; rectifier filter circuit and current sampling circuit input load; isolate negative-feedback circuit one input and accept the signal of another output output of current sampling circuit; isolate another input of negative-feedback circuit and accept the signal of rectifier filter circuit output through the protective circuit input; PWM pulse width control circuit one input accepts to isolate the signal of negative-feedback circuit output; another input of PWM pulse width control circuit is accepted from the signal of another output of transforming circuit through the regenerative circuit input, and the signal of PWM pulse width control circuit output output is through V-MOSFET power switch control transforming circuit.
2. a kind of LED constant-flow driver as claimed in claim 1 is characterized in that: described current sampling circuit comprises a triode Q
2, its base stage is passed through resistance R successively
16And resistance R
14Accept the signal of current rectifying and wave filtering circuit output, its emitter passes through resistance R
11Accept the signal of current rectifying and wave filtering circuit output, its collector electrode passes through resistance R
12And resistance R
13Ground connection.
3. a kind of LED constant-flow driver as claimed in claim 2, it is characterized in that: described protective circuit comprises the resistance R of series connection
15And resistance R
17, resistance R
15Input accept the signal of current rectifying and wave filtering circuit output, resistance R
17Output head grounding, resistance R
15Output and triode Q
2Connect a voltage-stabiliser tube D between the base stage
7
4. a kind of LED constant-flow driver as claimed in claim 1 is characterized in that: described isolation negative-feedback circuit is a photoelectric coupled device.
5. a kind of LED constant-flow driver as claimed in claim 1 is characterized in that: described PWM pulse-width modulation circuit and V-MOSFET power switch are formed pulse width control circuit.
6. a kind of LED constant-flow driver as claimed in claim 1, it is characterized in that: described filter circuit comprises electromagnetic interface filter, rectifier filter, passes through current-limiting resistance R between electromagnetic interface filter and the rectifier filter respectively
1With negative temperature thermistor R
2Connect, the signal of telecommunication is through electromagnetic interface filter and rectifier filter input transforming circuit.
7. a kind of LED constant-flow driver as claimed in claim 1, it is characterized in that: described transforming circuit comprises the auto-excitation type high frequency transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100263905A CN100571479C (en) | 2006-05-09 | 2006-05-09 | A kind of LED constant-flow driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100263905A CN100571479C (en) | 2006-05-09 | 2006-05-09 | A kind of LED constant-flow driver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1893752A CN1893752A (en) | 2007-01-10 |
| CN100571479C true CN100571479C (en) | 2009-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100263905A Expired - Fee Related CN100571479C (en) | 2006-05-09 | 2006-05-09 | A kind of LED constant-flow driver |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7528551B2 (en) * | 2007-02-26 | 2009-05-05 | Semiconductor Components Industries, L.L.C. | LED control system |
| CN102300359A (en) * | 2010-06-25 | 2011-12-28 | 首利实业股份有限公司 | Power supply device of light emitting diode (LED) lamp |
| CN201967215U (en) * | 2011-02-25 | 2011-09-07 | 福州凡普科技有限公司 | Light-emitting diode (LED) constant current driven circuit device |
| CN201967220U (en) * | 2011-04-26 | 2011-09-07 | 福州凡普科技有限公司 | LED (Light-emitting diode) constant current driving circuit device |
| CN102238784B (en) * | 2011-08-08 | 2014-04-09 | 张晓华 | Light-emitting diode (LED) power supply driving circuit |
| CN103929863B (en) * | 2014-04-30 | 2016-04-13 | 长兴泛亚照明电器有限公司 | A kind of LED driving power circuit |
| CN105357843A (en) * | 2015-12-11 | 2016-02-24 | 成都翰道科技有限公司 | Intelligent LED lamp energy-saving control system based on constant-current rectification filter circuit |
| CN105611677B (en) * | 2016-03-03 | 2018-11-06 | 威宇（北京）光电技术有限公司 | A kind of downlink communication system with ACLED lighting sources |
| CN106445059B (en) * | 2016-09-05 | 2023-09-08 | 深圳市炜烨丰电子科技有限公司 | Hard disk protection circuit for sudden change of alternating current power grid voltage |
| CN107835547A (en) * | 2017-12-08 | 2018-03-23 | 刘彦成 | LED power-supplying circuit |
| CN109274887B (en) * | 2018-09-21 | 2020-09-25 | 普联技术有限公司 | Pulse width control circuit and network camera |
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2006
- 2006-05-09 CN CNB2006100263905A patent/CN100571479C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1893752A (en) | 2007-01-10 |
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