CN108684103A - A kind of wide-voltage range output constant power LED drive power circuit system - Google Patents
A kind of wide-voltage range output constant power LED drive power circuit system Download PDFInfo
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- CN108684103A CN108684103A CN201810505013.2A CN201810505013A CN108684103A CN 108684103 A CN108684103 A CN 108684103A CN 201810505013 A CN201810505013 A CN 201810505013A CN 108684103 A CN108684103 A CN 108684103A
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- 238000000465 moulding Methods 0.000 claims description 2
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- 238000005516 engineering process Methods 0.000 description 5
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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Abstract
The present invention discloses a kind of wide-voltage range output constant power LED drive power circuit system, including LED output-voltage loops control module, LED output current rings control module, MCU intelligent constants power control module, voltage and current loop reference circuit, power control circuit and LED output circuits.The present invention can solve prior art pure hardware circuit complexity, and error is big, and the circuit for being unable to wide scope invariable power and hardware+MCU software technology invariable powers is complicated, and complex production process, invariable power response speed is slower, realize the expensive disadvantage of invariable power.
Description
Technical field
The present invention relates to a kind of wide-voltage range output constant power LED drive power circuit systems.
Background technology
Existing invariable power technology is substantially divided to two kinds：1, pure hardware circuit sampling and outputting voltage and sampled output current signal
The shortcomings that input amplifier IC progress simulation trial control realization invariable powers, this kind of circuit is that circuit is more complex, wide scope invariable power
Output realization is more difficult, and output constant power precision is poor.
2, hardware circuit sampling and outputting voltage and output current signal input MCUAD samplings, the electricity write by host computer
Pressure and current control reference signal carry out software and invariable power are calculated, and the technology circuit is complicated, complex production process, invariable power
Response speed is slower, realizes that invariable power is expensive.
Invention content
The present invention mainly overcomes shortcoming in the prior art, proposes that wide-range high-accuracy perseverance work(may be implemented in one kind
The wide-voltage range output constant power LED drive power circuit system of rate output, the present invention can solve the pure hardware of the prior art
Circuit is complicated, and error is big, and the circuit for being unable to wide scope invariable power and hardware+MCU software technology invariable powers is complicated, production technology
Cumbersome, invariable power response speed is slower, realizes the expensive disadvantage of invariable power.
The present invention solves the technical solution that above-mentioned technical problem is provided：A kind of wide-voltage range output constant power LED
Driving power circuit system, including LED output-voltage loops control module, LED output current rings control module, MCU intelligent constant work(
Rate control module, voltage and current loop reference circuit, power control circuit and LED output circuits；
The output end of the LED output circuits is separately connected LED output voltage loops control module, LED output current rings
Road control module, MCU intelligent constant power control modules；The output end of the power control circuit be separately connected LED output circuits,
LED output-voltage loops control module, voltage and current loop reference circuit；The output end of the voltage and current loop reference circuit connects
Connect LED output current ring control modules；The output end of the MCU intelligent constants power control module connects LED output current ring controls
Molding block；The output end connection power control circuit of the LED output currents loop back control module is implemented control power supply output and is reached
To invariable power purpose.
Further embodiment is that the LED output circuits include LED output filter circuits, output current sampling electricity
Road, the output ends of the LED output filter circuits respectively with LED output voltage loops control module, MCU intelligence power limitation controls
Module connects；The output end of the output current sample circuit is connect with LED output current loop back control modules.
Further embodiment is that the LED output-voltage loops control module includes the first feedback circuit, the first partial pressure
Circuit, diode, voltage adjust IC, and the input terminal of first bleeder circuit is connect with the output end of LED output filter circuits,
The anode of the diode is connect with the output end of power control circuit, and cathode adjusts IC with the first feedback circuit, voltage respectively
Connection, first feedback circuit, the first bleeder circuit are connected with each other, and the voltage adjusts IC and connect with the first bleeder circuit.
Further embodiment is that the LED output currents ring control module includes current sample filter module, second
Feedback circuit, current voltage distribution setting filter circuit, voltage comparator, the reverse input end and current sample of the voltage comparator
The output end of filter module connects, and the output end that noninverting input sets filter circuit with current voltage distribution is connect, output end and electricity
Source control circuit connects, and the second feedback circuit is connected between reverse input end and output end；The current voltage distribution sets filtered electrical
The input terminal on road is connect with the output end of MCU intelligent constant power control modules, the input terminal of the current sample filter module with
The output end of output current sample circuit connects.
Further embodiment is that the MCU intelligent constants power control module includes that AD conversion voltage variable operation is defeated
Go out circuit, PWM outputs integrating circuit, the second pressure filter circuit, MCU module reference circuit, second pressure filter circuit
Input terminal connect with the output end of LED output filter circuits, the input terminal of the AD conversion voltage variable operation output circuit
It is connect respectively with the output end of the second pressure filter circuit, MCU module reference circuit, the input of the PWM outputs integrating circuit
The input terminal of the output end at end and AD conversion voltage variable operation output circuit, output end and current voltage distribution setting filter circuit connects
It connects.
Advantageous effect of the invention is：Patent of the present invention is arranged using independent sampling and outputting voltage is only needed by MCU models
Internal reference voltage, internal reference voltage is equal with setting output minimum output voltage AD samplings partial pressure value, is transported by MCU softwares
It calculates (setting minimum output voltage is than setting maximum output voltage) and obtains setting output minimum voltage and setting output ceiling voltage
Ratio, obtaining the control output currents of invariable power needs by ratio and output current sampled value product, (reversed setting also may be used
Realize invariable power), realize wide-range high-accuracy constant power output.
Description of the drawings
Fig. 1 is the structure diagram of the present invention；
Fig. 2 is the functional block diagram of the present invention；
Fig. 3 is the circuit diagram of the present invention.
Specific implementation mode
Further description is done to the present invention with reference to embodiment and attached drawing.
As shown in Figure 1, a kind of wide-voltage range output constant power LED drive power circuit system of the present invention, including LED
Output-voltage loop control module 4, LED output current rings control module 5, MCU intelligent constants power control module 6, voltage and current ring
Road reference circuit 3, power control circuit 1 and LED output circuits 2；
The output end of the LED output circuits 2 is separately connected LED output voltage loops control module 4, LED output currents
Loop back control module 5, MCU intelligent constants power control module 6；The output end of the power control circuit 1 is separately connected LED outputs
Circuit 2, LED output-voltage loops control module 4, voltage and current loop reference circuit 3；The voltage and current loop reference circuit 3
Output end connection LED output current rings control module 5；The output end of the MCU intelligent constants power control module 6 connects LED
Output current ring control module 5；The output end connection power control circuit 1 of the LED output currents loop back control module 5 is implemented
Control power supply output reaches invariable power purpose, implements circuit system of the present invention, is adapted to equal-wattage output, difference input electricity
Press the compatibility of range L ED lamps and lanterns.
Internal reference voltage is arranged using independent sampling and outputting voltage is only needed, by MCU models in patent of the present invention, internal
Reference voltage is equal with setting output minimum output voltage AD samplings partial pressure value, passes through MCU softwares operation (the minimum output electricity of setting
Pressure ratio sets maximum output voltage) obtain the ratio of setting output minimum voltage and setting output ceiling voltage, by ratio and
Output current sampled value product obtains the control output current of invariable power needs, realizes wide-range high-accuracy constant power output.
As shown in Fig. 2, specific embodiment is in the present embodiment, the LED output circuits 2 include LED output filtering
The output end of circuit, output current sample circuit, the LED output filter circuits controls mould with LED output voltage loops respectively
Block 5, MCU intelligent constants power control module 6 connect；The output end of the output current sample circuit and LED output current loops
Control module 5 connects.
The LED output-voltage loops control module 4 includes the first feedback circuit, the first bleeder circuit, diode, voltage tune
Save IC, the input terminal of first bleeder circuit connect with the output end of LED output filter circuits, the diode positive and
The output end of power control circuit 1 connects, and cathode adjusts IC and connect with the first feedback circuit, voltage respectively, first feedback
Circuit, the first bleeder circuit are connected with each other, and the voltage adjusts IC and connect with the first bleeder circuit.
The LED output currents ring control module 5 includes current sample filter module, the second feedback circuit, current voltage distribution
Set filter circuit, voltage comparator, the output end of the reverse input end and current sample filter module of the voltage comparator
Connection, the output end that noninverting input sets filter circuit with current voltage distribution are connect, and output end is connect with power control circuit 1,
The second feedback circuit is connected between reverse input end and output end；The input terminal and MCU of the current voltage distribution setting filter circuit
The output end of intelligent constant power control module 6 connects, input terminal and the output current sampling electricity of the current sample filter module
The output end on road connects.
The MCU intelligent constants power control module 6 includes AD conversion voltage variable operation output circuit, PWM output integrals
Circuit, the second pressure filter circuit, MCU module reference circuit, input terminal and the LED outputs of second pressure filter circuit are filtered
The output end of wave circuit connects, and the input terminal of the AD conversion voltage variable operation output circuit is electric with the second divider filter respectively
The input terminal of the output end on road, the connection of MCU module reference circuit, the PWM outputs integrating circuit is transported with AD conversion voltage variable
The output end of output circuit is calculated, the input terminal that output end sets filter circuit with current voltage distribution is connect.
In above-described embodiment wherein：
Wide-voltage range exports intelligent constant power circuit principle：
Pout=U*I output powers=output voltage × output current
Pout--- output powers；
U-- output voltages；
I-- output currents
Invariable power realization principle：
Constant to output power, if output voltage doubles, then output current must reduce one times
Example：If a output power is the power supply of 100W；
Output voltage is that then the electric power outputting current is 25V：100W ÷ 25V=4A
If output voltage doubles as 25V*2=50V, output current is：100W ÷ 50V=2A
Curent change range ratio is：When ceiling voltage electric current 2A ÷ minimum voltage electric currents 4A=0.5 sets minimum output voltage
Output current ratio is 100%, then output current ratio is 50% when maximum output voltage, if realizing 100W constant power output voltages
25V-50V changes, and output current variation ratio changes between being 100%~50% can meet invariable power condition.
It can be obtained from principles above：The desired output voltage range of setting (minimum output voltage and maximum output electricity
Pressure), if output current is 100% when minimum output voltage, then output current is when maximum output voltage：
I=Umin ÷ Umax
It is obtained by principles above inference：The output voltage of sampling power supply is only needed, the variation of output current is then controlled
Ratio can be obtained by accurate constant power output.
As shown in figure 3, it is described by LED output circuits through resistance R1, the resistance R2 in the first pressure sampling circuit divide to
LED output-voltage loops control module limits power supply maximum output voltage, i.e. wide range output voltage invariable power highest is defeated
Go out voltage.It is 2V, setting the second sampling input AD electricity that internal reference voltage, which is arranged, by software in MCU intelligent constants power control module
Electric current output PWM duty cycle rate is 100% when pressure≤2V, and power supply output minimum voltage is through the second partial pressure wave filtering circuit at this time
Resistance R8, that resistance R9, resistance R10, capacitance C8 provide reference voltage built in output sampling AD voltages and MCU is equal, work as output
When circuit voltage gradually rises, wave filtering circuit voltage is divided to output circuit second by MCU internal references voltage and is removed
Method operation, MCU output current PWM duty cycles, which correspond to, to be reduced, and PWM output signal is converted into simulation by PWM output integrating circuit
Voltage signal, control changes the current voltage distribution setting value of LED output current ring control modules, by electric current amplifier IC U4A to defeated
Go out current sample voltage and MCU output currents setting voltage compares, adjusts power control circuit, reduce Switching Power Supply PWM outputs
Duty ratio exports intelligent invariable power to realize.
The above is not intended to limit the present invention in any form, although the present invention is taken off by above-described embodiment
Show, however, it is not intended to limit the invention, any person skilled in the art, is not departing from technical solution of the present invention range
It is interior, when the technology contents using the disclosure above make a little equivalent embodiments changed or be modified to equivalent variations, as long as being not
Be detached from technical solution of the present invention content, according to the technical essence of the invention to made by above example it is any it is simple modification,
Equivalent variations and modification, in the range of still falling within technical solution of the present invention.
Claims (5)
1. a kind of wide-voltage range output constant power LED drive power circuit system, which is characterized in that including LED output voltages
Ring control module, LED output current rings control module, MCU intelligent constants power control module, voltage and current loop reference circuit,
Power control circuit and LED output circuits；
The output end of the LED output circuits is separately connected LED output voltage loops control module, LED output current loop controls
Molding block, MCU intelligent constant power control modules；The output end of the power control circuit is separately connected LED output circuits, LED
Output-voltage loop control module, voltage and current loop reference circuit；The output end of the voltage and current loop reference circuit connects
LED output current ring control modules；The output end connection LED output current rings control of the MCU intelligent constants power control module
Module；The output end connection power control circuit of the LED output currents loop back control module is implemented control power supply output and is reached
Invariable power purpose.
2. a kind of wide-voltage range output constant power LED drive power circuit system according to claim 1, feature exist
In, LED output circuits include LED output filter circuits, output current sample circuit, the LED output filter circuits
Output end is connect with LED output voltage loops control module, MCU intelligent constant power control modules respectively；The output current is adopted
The output end of sample circuit is connect with LED output current loop back control modules.
3. a kind of wide-voltage range output constant power LED drive power circuit system according to claim 2, feature exist
In, the LED output-voltage loops control module adjusts IC including the first feedback circuit, the first bleeder circuit, diode, voltage,
The input terminal of first bleeder circuit is connect with the output end of LED output filter circuits, the anode and power supply of the diode
The output end of control circuit connects, and cathode adjusts IC and connect with the first feedback circuit, voltage respectively, first feedback circuit,
First bleeder circuit is connected with each other, and the voltage adjusts IC and connect with the first bleeder circuit.
4. a kind of wide-voltage range output constant power LED drive power circuit system according to claim 3, feature exist
In the LED output currents ring control module includes current sample filter module, the second feedback circuit, current voltage distribution setting filter
The reverse input end of wave circuit, voltage comparator, the voltage comparator is connect with the output end of current sample filter module, together
The output end for setting filter circuit with current voltage distribution to input terminal is connect, and output end is connect with power control circuit, reversed to input
The second feedback circuit is connected between end and output end；The input terminal and MCU intelligent constant work(of the current voltage distribution setting filter circuit
The output end of rate control module connects, the output end of the input terminal and output current sample circuit of the current sample filter module
Connection.
5. a kind of wide-voltage range output constant power LED drive power circuit system according to claim 4, feature exist
In, the MCU intelligent constants power control module include AD conversion voltage variable operation output circuit, PWM outputs integrating circuit, the
Two pressure filter circuits, MCU module reference circuit, input terminal and the LED output filter circuits of second pressure filter circuit
Output end connection, the input terminal of the AD conversion voltage variable operation output circuit is defeated with the second pressure filter circuit respectively
The input terminal of outlet, the connection of MCU module reference circuit, the PWM outputs integrating circuit is exported with AD conversion voltage variable operation
The output end of circuit, the input terminal that output end sets filter circuit with current voltage distribution are connect.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810505013.2A CN108684103A (en) | 2018-05-24 | 2018-05-24 | A kind of wide-voltage range output constant power LED drive power circuit system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810505013.2A CN108684103A (en) | 2018-05-24 | 2018-05-24 | A kind of wide-voltage range output constant power LED drive power circuit system |
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| CN108684103A true CN108684103A (en) | 2018-10-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109348588A (en) * | 2018-12-17 | 2019-02-15 | 海浦科技(深圳)有限公司 | LED lamp firm power control method and device |
| CN109413798A (en) * | 2018-10-23 | 2019-03-01 | 深圳市崧盛电子股份有限公司 | A kind of power supply constant-power control circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105142260A (en) * | 2014-08-12 | 2015-12-09 | 杭州士兰微电子股份有限公司 | LED driving circuit applicable to silicon controlled rectifier light modulator, and control circuit thereof |
| CN105592590A (en) * | 2016-01-05 | 2016-05-18 | 茂硕电源科技股份有限公司 | Constant-power LED driving power supply circuit system |
-
2018
- 2018-05-24 CN CN201810505013.2A patent/CN108684103A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105142260A (en) * | 2014-08-12 | 2015-12-09 | 杭州士兰微电子股份有限公司 | LED driving circuit applicable to silicon controlled rectifier light modulator, and control circuit thereof |
| CN105592590A (en) * | 2016-01-05 | 2016-05-18 | 茂硕电源科技股份有限公司 | Constant-power LED driving power supply circuit system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109413798A (en) * | 2018-10-23 | 2019-03-01 | 深圳市崧盛电子股份有限公司 | A kind of power supply constant-power control circuit |
| CN109413798B (en) * | 2018-10-23 | 2023-12-08 | 深圳市崧盛电子股份有限公司 | Constant power control circuit of power supply |
| CN109348588A (en) * | 2018-12-17 | 2019-02-15 | 海浦科技(深圳)有限公司 | LED lamp firm power control method and device |
| CN109348588B (en) * | 2018-12-17 | 2021-10-15 | 海浦科技(深圳)有限公司 | Constant power control method and device for LED lamp |
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