CN205491284U - Permanent power LED power supply circuit system - Google Patents
Permanent power LED power supply circuit system Download PDFInfo
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- CN205491284U CN205491284U CN201620009372.5U CN201620009372U CN205491284U CN 205491284 U CN205491284 U CN 205491284U CN 201620009372 U CN201620009372 U CN 201620009372U CN 205491284 U CN205491284 U CN 205491284U
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Abstract
The embodiment of the utility model discloses permanent power LED power supply circuit system, this system include host computer, little the control unit MCU, voltage ring module, electric current loop module, control circuit and LED output circuit, wherein: MCU's input is connected to the control end of host computer, and MCU's first output connection voltage encircles the first input end of module, and LED output circuit's voltage sample end is connected to the second input of voltage ring module, and voltage encircles the input of the output connection control circuit of module, control circuit's output connection LED output circuit's input, the first input end of MCU's second output junction current ring module, the input of LED output circuit's current sample end, the output connection control circuit of electric current loop module is connected to the second input of electric current loop module. Implement the embodiment of the utility model provides a, can improve the compatibility of LED lamps and lanterns.
Description
Technical field
This utility model relates to electronic circuit technology field, is specifically related to a kind of invariable power LED drive power electricity
Road system.
Background technology
Light emitting diode (Light Emitting Diode, LED) is a kind of novel lighting source, with white heat
The conventional illumination sources such as lamp, fluorescent lamp is compared, and LED has that volume is little, caloric value is low, power consumption is little, the longevity
The advantages such as life is long, fast, the environmental protection of response speed, obtain in fields such as room lighting, street lamp, Landscape Lightings
It is widely applied.Current LED drive power is generally divided into LED constant current and drives power supply (i.e. LED constant current
The output electric current driving power supply is fixed value) and LED constant-voltage driving power source (i.e. LED constant-voltage driving power source
Output voltage is fixed value), due to the running voltage of LED lamp of different model and operating current difference relatively
Greatly, current LED drive power cannot the LED lamp of compatible different model, LED lamp compatibility is relatively
Difference.
Utility model content
This utility model embodiment provides a kind of invariable power LED drive power circuit system, can improve LED
The compatibility of light fixture.
This utility model embodiment provides a kind of invariable power LED drive power circuit system, including host computer,
Micro-control unit MCU, Voltage loop module, electric current loop module, control circuit and LED output circuit, wherein:
The input controlling the end described MCU of connection of described host computer, first outfan of described MCU connects
The first input end of described Voltage loop module, it is defeated that the second input of described Voltage loop module connects described LED
Going out the voltage sample end of circuit, the outfan of described Voltage loop module connects the input of described control circuit,
The outfan of described control circuit connects the input of described LED output circuit；Second output of described MCU
End connects the first input end of described electric current loop module, and the second input of described electric current loop module connects described
The current sample end of LED output circuit, the outfan of described electric current loop module connects the defeated of described control circuit
Enter end；
Described host computer sends a control signal to described MCU, described MCU and generates according to described control signal
Voltage reference signal and current reference signal, first outfan of described MCU exports described voltage reference signal
To the first input end of described Voltage loop module, second outfan of described MCU exports described current reference letter
Number to the first input end of described electric current loop module, wherein, described voltage reference signal and described current reference
Amassing as definite value of signal；Second input of described Voltage loop module gathers the sampling of described LED output circuit
Voltage signal, the second input of described electric current loop module gathers the sample rate current letter of described LED output circuit
Number；When the load in described LED output circuit be constant voltage load or unloaded time, described Voltage loop module according to
Described voltage reference signal and the difference of described sampled voltage signal export the first level signal and control electricity to described
Road, described control circuit is according to described first level signal output voltage control signal to described LED output electricity
Road, to control the running voltage of described LED output circuit；When the load in described LED output circuit is permanent
During current load, described electric current loop module is according to the difference of described current reference signal Yu described sampled current signals
Output second electrical level signal is to described control circuit, and described control circuit exports according to described second electrical level signal
Current controling signal is to described LED output circuit, to control the operating current of described LED output circuit.
Wherein, described Voltage loop module includes the first bleeder circuit, the first pressure filter circuit, the first voltage
Comparator and the first feedback circuit, wherein:
The input of described first bleeder circuit connects the voltage sample end of described LED output circuit, and described the
The outfan of one bleeder circuit connects the inverting input of described first voltage comparator, described first dividing potential drop filter
The input of wave circuit connects first outfan of described MCU, the outfan of described first pressure filter circuit
Connect the in-phase input end of described first voltage comparator, the inverting input of described first voltage comparator with
Described first feedback circuit is connected between the outfan of described first voltage comparator；
Described first bleeder circuit obtains voltage division signal output of sampling after described sampled voltage signal is carried out dividing potential drop
To the inverting input of described first voltage comparator, described first pressure filter circuit is to described voltage reference
Obtain benchmark voltage division signal after signal divider filter, described benchmark voltage division signal is inputted described first voltage ratio
The in-phase input end of relatively device.
Wherein, described first bleeder circuit includes the first resistance, the second resistance, the 3rd resistance, the 4th resistance
With the first electric capacity, the first end of described first resistance connects voltage sample end and the institute of described LED output circuit
Stating the first end of the second resistance, the second end of described first resistance connects the first end of described first electric capacity, institute
The second end stating the first electric capacity connects the second end of described second resistance, the first end of described 3rd resistance and institute
Stating the first end of the 4th resistance, the second end of described 3rd resistance connects the anti-phase of described first voltage comparator
Input, the second end ground connection of described 4th resistance.
Wherein, described first pressure filter circuit includes the 5th resistance, the 6th resistance and the second electric capacity, described
First end of the 5th resistance connects first outfan of described MCU, and the second end of described 5th resistance connects institute
The homophase stating the first end of the 6th resistance, the first end of described second electric capacity and described first voltage comparator is defeated
Enter end, the second end of described 6th resistance and the second end ground connection of described second electric capacity.
Wherein, described first feedback circuit includes the 3rd electric capacity and the 7th resistance, the second of described 3rd electric capacity
End connects the inverting input of described first voltage comparator, and the first end of described 3rd electric capacity connects described the
First end of seven resistance, the second end of described 7th resistance connects the outfan of described first voltage comparator.
Wherein, described electric current loop module includes the second bleeder circuit, the second pressure filter circuit, the second voltage
Comparator and the second feedback circuit, wherein:
The input of described second bleeder circuit connects the current sample end of described LED output circuit, and described the
The outfan of two bleeder circuits connects the inverting input of described second voltage comparator, described second dividing potential drop filter
The input of wave circuit connects second outfan of described MCU, the outfan of described second pressure filter circuit
Connect the in-phase input end of described second voltage comparator, the inverting input of described second voltage comparator with
Described second feedback circuit is connected between the outfan of described second voltage comparator；
Described second bleeder circuit obtains shunting signal output of sampling after described sampled current signals is carried out dividing potential drop
To the inverting input of described second voltage comparator, described second pressure filter circuit is to described current reference
Obtain benchmark shunting signal after signal divider filter, described benchmark shunting signal is inputted described second voltage ratio
The in-phase input end of relatively device.
Wherein, described second pressure filter circuit include the 8th resistance, the 9th resistance, the tenth resistance, the 4th
Electric capacity and the 5th electric capacity, the first end of described 8th resistance connects second outfan of described MCU, and described the
Second end of eight resistance connect the first end of described tenth resistance, the first end of described 4th electric capacity, described the
First end of five electric capacity and the first end of described 9th resistance, the second end of described tenth resistance, the described 4th
Second end of electric capacity and the second end ground connection of described 5th electric capacity, the second end of described 9th resistance connects described
The in-phase input end of the second voltage comparator.
Wherein, described second bleeder circuit includes the 11st resistance and the 6th electric capacity, described 11st resistance
First end connects the current sample end of described LED output circuit, and the second end of described 11st resistance connects institute
State the first end and the inverting input of described second voltage comparator of the 6th electric capacity, the of described 6th electric capacity
Two end ground connection.
Wherein, described second feedback circuit includes the 12nd resistance, the 7th electric capacity and the 8th electric capacity, described
First end of 12 resistance connects the outfan and the first of described 8th electric capacity of described second voltage comparator
End, the second end of described 12nd resistance connects the first end of described 7th electric capacity, the of described 7th electric capacity
Two ends connect the second end and the inverting input of described second voltage comparator of described 8th electric capacity.
Wherein, the in-phase input end of described second voltage comparator and described second voltage comparator is anti-phase defeated
Entering and connect the 9th electric capacity between end, the first end of described 9th electric capacity connects the same of described second voltage comparator
Phase input, the second end of described 9th electric capacity connects the inverting input of described second voltage comparator.
In this utility model embodiment, invariable power LED drive power circuit system includes host computer, microcontroller
Unit MCU, Voltage loop module, electric current loop module, control circuit and LED output circuit, the control of host computer
End processed connects the input of MCU, and first outfan of MCU connects the first input end of Voltage loop module, electricity
Second input of pressure ring module connects the voltage sample end of LED output circuit, the outfan of Voltage loop module
Connecting the input of control circuit, the outfan of control circuit connects the input of LED output circuit；MCU
Second outfan connect electric current loop module first input end, electric current loop module second input connect
The current sample end of LED output circuit, the outfan of electric current loop module connects the input of control circuit；On
Position machine sends a control signal to MCU, MCU and generates voltage reference signal and current reference letter according to control signal
Number, the first input end of the first outfan output voltage reference signal of MCU to Voltage loop module, MCU
The second outfan output current reference signal to the first input end of electric current loop module, wherein, voltage reference
Signal amasss as definite value with current reference signal.Implement this utility model embodiment, can be sent out by host computer
Sending and control signal to MCU, MCU is according to control signal generation voltage reference signal to Voltage loop module, MCU
According to control signal generation current reference signal to electric current loop module, wherein, voltage reference signal and electric current base
Amassing as definite value of calibration signal；Voltage loop module gathers the sampled voltage signal of LED output circuit, electric current loop mould
Block gathers the sampled current signals of LED output circuit, when the load in LED output circuit is constant voltage load or empty
During load, Voltage loop module exports the first level signal according to the difference of voltage reference signal Yu sampled voltage signal
To control circuit, control circuit according to the first level signal output voltage control signal to LED output circuit,
To control the running voltage of LED output circuit, when the load in LED output circuit is Constant Current Load, voltage
Ring module exports second electrical level signal to controlling electricity according to the difference of current reference signal with sampled current signals
Road, control circuit controls signal to LED output circuit according to second electrical level signal output current, to control LED
The operating current of output circuit, can be logical when the load in LED output circuit is constant voltage load or zero load
Overvoltage ring module adjusts the running voltage of LED lamp in LED output circuit, bearing in LED output circuit
When carrying as Constant Current Load, adjust the operating current of LED lamp in LED output circuit by electric current loop module.This
Invariable power LED drive power circuit system in utility model embodiment can realize Width funtion and wide electric current is defeated
Go out, can the LED lamp of compatible different model, improve the compatibility of LED lamp.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below by right
In embodiment or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that below,
Accompanying drawing in description is only embodiments more of the present utility model, for those of ordinary skill in the art,
On the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structure of a kind of invariable power LED drive power circuit system disclosed in this utility model embodiment
Schematic diagram；
Fig. 2 is the knot of another kind of invariable power LED drive power circuit system disclosed in this utility model embodiment
Structure schematic diagram；
Fig. 3 is the knot of another kind of invariable power LED drive power circuit system disclosed in this utility model embodiment
Structure schematic diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, to the skill in this utility model embodiment
Art scheme is clearly and completely described.Obviously, described embodiment is one of the present utility model
Divide embodiment rather than whole embodiment.Based on the embodiment in this utility model, this area is general
The every other embodiment that logical technical staff is obtained on the premise of not making creative work, all answers
Belong to the scope of this utility model protection.
This utility model embodiment provides a kind of invariable power LED drive power circuit system, can improve LED
The compatibility of light fixture.It is described in detail individually below.
Referring to Fig. 1, Fig. 1 is a kind of invariable power LED drive power circuit disclosed in this utility model embodiment
The structural representation of system.As it is shown in figure 1, the invariable power LED drive power circuit described in the present embodiment
System, including host computer 100, micro-control unit MCU101, Voltage loop module 102, electric current loop module 103,
Control circuit 104 and LED output circuit 105, wherein:
The input 113 controlling end connection MCU101 of host computer 100, first outfan 111 of MCU101
Connecting the first input end 121 of Voltage loop module 102, the second input 122 of Voltage loop module 102 connects
The voltage sample end 151 of LED output circuit 105, the outfan 123 of Voltage loop module 102 connects control circuit
The input 141 of 104, the outfan 142 of control circuit 104 connects the input 153 of LED output circuit 105；
Second outfan 112 of MCU101 connects the first input end 131 of electric current loop module 103, electric current loop module 103
The second input 132 connect the current sample end 152 of LED output circuit 105, electric current loop module 103 defeated
Go out the input 141 of end 133 connection control circuit 104；
Host computer 100 sends a control signal to MCU101, MCU101 and generates voltage reference according to control signal
Signal and current reference signal, the first outfan 111 output voltage reference signal of MCU101 is to Voltage loop mould
The first input end 121 of block 102, second outfan defeated 112 of MCU101 goes out current reference signal to electric current loop
The first input end 131 of module 103, wherein, voltage reference signal amasss as definite value with current reference signal；
Second input 122 of Voltage loop module 102 gathers the sampled voltage signal of LED output circuit 105, electric current loop
Second input 132 of module 103 gathers the sampled current signals of LED output circuit 105, when LED output electricity
When load in road 105 is constant voltage load or zero load, Voltage loop module 102 is according to voltage reference signal and sampling
The difference of voltage signal exports the first level signal to control circuit 104, and control circuit 104 is according to the first level
Signal output voltage controls signal to LED output circuit 105, to control the work electricity of LED output circuit 105
Pressure；When the load in LED output circuit 105 is Constant Current Load, electric current loop module 103 is according to current reference
Signal exports second electrical level signal to control circuit 104, control circuit 104 with the difference of sampled current signals
LED output circuit 105 is controlled signal to, to control LED output circuit 105 according to second electrical level signal output current
Operating current.
In this utility model embodiment, the load in LED output circuit 105 is LED, control circuit 104
Cascade coupled resonator modules LLC, transformator translation circuit, rectification circuit can be included.Host computer 100 is used for sending
Control signal to MCU101, MCU101 according to different control signal produce different voltage reference signals and
Current reference signal, voltage reference signal and current reference signal can be pulse width modulation (Pulse-Width
Modulation, PWM) signal, the size of voltage reference signal can be by the duty of voltage reference signal
Ratio embodies, and the dutycycle of voltage reference signal is the biggest, and voltage reference signal is the biggest, current reference signal
Size can be embodied by the dutycycle of current reference signal, and the dutycycle of current reference signal is the biggest, electricity
Stream reference signal is the biggest, and wherein, voltage reference signal amasss as definite value, i.e. voltage base with current reference signal
The dutycycle of calibration signal is amassed as definite value with the dutycycle of current reference signal.According in LED output circuit
The difference of the model of LED lamp, user can arrange different reference voltages and reference current in host computer,
Such as, for the driving power supply that invariable power is 120W, output voltage range is 114V～171V, exports electric current
Scope is 0.7A～1.05A, if the dutycycle arranging voltage reference signal is 100%, then output voltage is 171V,
If the dutycycle arranging voltage reference signal is 66.6%, then output voltage is 114V, if arranging current reference letter
Number dutycycle be 100%, then output electric current be 1.05A, if the dutycycle arranging current reference signal is
66.6%, then output electric current is 0.7A, wherein, for the driving power supply that invariable power is 120W, voltage reference
The dutycycle of signal can change between 66.6%～100%, and the dutycycle of current reference signal can be from
Change between 66.6%～100%, it is possible to achieve Width funtion and wide electric current output, the dutycycle of voltage reference signal
With amassing as steady state value (66.6%) of the dutycycle of current reference signal.If the LED in LED output circuit
The total nominal voltage of tool is for become 150V from 114V, and total rated current for become 0.8A from 1.05A, then arranges electricity
The dutycycle of pressure reference signal becomes 87.7% from 66.6%, then the dutycycle arranging current reference signal is 100%
Become 76.2%.
In this utility model embodiment, the second input 122 of Voltage loop module 102 gathers LED output circuit
The sampled voltage signal of 105, sampled voltage signal is the work at present electricity of LED lamp in LED output circuit 105
Pressure, when the load in LED output circuit 105 is constant voltage load or zero load, Voltage loop module 102 is according to electricity
Pressure reference signal exports the first level signal to control circuit 104, control circuit with the difference of sampled voltage signal
104 according to the first level signal output voltage control signal to LED output circuit 105, to control LED output electricity
The running voltage on road 105；Second input 132 of electric current loop module 103 gathers adopting of LED output circuit 105
Sample current signal, sampled current signals is the current working current of LED lamp in LED output circuit 105, when
When load in LED output circuit 105 is constant voltage load or zero load, electric current loop module 103 is according to current reference
Signal exports second electrical level signal to control circuit 104, control circuit 104 with the difference of sampled current signals
LED output circuit 105 is controlled signal to, to control LED output circuit 105 according to second electrical level signal output current
Operating current.
Invariable power LED drive power circuit system in this utility model embodiment can pass through Voltage loop module
With running voltage and the operating current that electric current loop module adjusts LED lamp in LED output circuit, it is possible to achieve wide
Voltage and the output of wide electric current, can the LED lamp of compatible different model, improve the compatibility of LED lamp.
Optionally, as in figure 2 it is shown, Voltage loop module includes first bleeder circuit the 1021, first divider filter electricity
Road the 1022, first voltage comparator U1 and the first feedback circuit 1023, wherein:
The input 122 of the first bleeder circuit 1021 connects the voltage sample end 151 of LED output circuit, and first
The outfan of bleeder circuit 1021 connects the inverting input 2 of the first voltage comparator U1, the first divider filter electricity
The input 121 on road 1022 connects first outfan 111 of MCU, the output of the first pressure filter circuit 1022
End connects the in-phase input end 1 of the first voltage comparator U1, the inverting input 2 of the first voltage comparator U1 with
The first feedback circuit 1023 is connected between the outfan 3 of the first voltage comparator U1；
First bleeder circuit 1021 obtains after sampled voltage signal is carried out dividing potential drop sampling voltage division signal output to the
The inverting input 2 of one voltage comparator U1, voltage reference signal dividing potential drop is filtered by the first pressure filter circuit 1022
Obtain benchmark voltage division signal after ripple, benchmark voltage division signal is inputted the in-phase input end of the first voltage comparator U1
1。
In this utility model embodiment, the feeder ear 5 of the first voltage comparator U1 connects 12V DC voltage, and first
Earth terminal 4 ground connection of voltage comparator U1, the first bleeder circuit 1021 obtains after sampled voltage signal carries out dividing potential drop
To sampling voltage division signal output to the inverting input 2 of the first voltage comparator U1, the first pressure filter circuit
Obtain benchmark voltage division signal after 1022 pairs of voltage reference signal divider filter, benchmark voltage division signal is inputted first
The in-phase input end 1 of voltage comparator U1, the first voltage comparator U1 is according to benchmark voltage division signal and sampling point
The difference of pressure signal exports different level signals to control circuit 104.If benchmark voltage division signal and sampling dividing potential drop
The difference of signal be on the occasion of, the first voltage comparator U1 output is high level to the level signal of control circuit 104
Signal, if benchmark voltage division signal is the biggest with the difference of sampling voltage division signal, the first voltage comparator U1 exports extremely
The high level signal of control circuit 104 is the biggest, and control circuit 104 is defeated to LED according to the output of this high level signal
Going out the voltage of circuit 105, to heighten control signal the biggest, and voltage heightens control signal for heightening LED output circuit
The running voltage of 105, it is the biggest that voltage heightens control signal, heightening of the running voltage of LED output circuit 105
Amplitude is the biggest；If benchmark voltage division signal is negative value with the difference of sampling voltage division signal, the first voltage comparator U1
Output is low level signal to the level signal of control circuit 104, if benchmark voltage division signal and sampling voltage division signal
The absolute value of difference the biggest, the low level signal of the first voltage comparator U1 output to control circuit 104 is more
Little, control circuit 104 turns down control letter according to the voltage of this low level signal output to LED output circuit 105
Number the biggest, voltage turns down control signal for turning down the running voltage of LED output circuit 105, and voltage turns down control
Signal processed is the biggest, the running voltage of LED output circuit 105 to turn down amplitude the biggest.
Optionally, as it is shown on figure 3, the first bleeder circuit 1021 include the first resistance R1, the second resistance R2,
Three resistance R3, the 4th resistance R4 and the first electric capacity C1, first end of the first resistance R1 connects LED output circuit
The voltage sample end 151 of 105 and first end of the second resistance R2, second end of the first resistance R1 connects the first electricity
Holding first end of C1, second end of the first electric capacity C1 connects second end of the second resistance R2, the 3rd resistance R3
The first end and first end of the 4th resistance R4, second end of the 3rd resistance R3 connects the first voltage comparator U1
Anti-phase input 2 end, the second end ground connection of the 4th resistance R4.
In this utility model embodiment, the first bleeder circuit 1021 by the second resistance R2, the 3rd resistance R3 and
The sampled voltage signal that voltage sample end 151 sampling of LED output circuit 105 is obtained by the 4th resistance R4 is carried out
Obtain sampling voltage division signal after dividing potential drop and export the inverting input 2 to the first voltage comparator U1.
Optionally, as it is shown on figure 3, the first pressure filter circuit 1022 includes the 5th resistance R5, the 6th resistance R6
The first end with the second electric capacity C2, the 5th resistance R5 connects first outfan 111 of MCU101, the 5th resistance
Second end of R5 connects first end of the 6th resistance R6, first end of the second electric capacity C2 and the first voltage comparator
The in-phase input end 1 of U1, second end of the 6th resistance R6 and the second end ground connection of the second electric capacity C2.
In this utility model embodiment, the first pressure filter circuit 1022 is by the 5th resistance R5, the 6th resistance
The voltage reference signal that MCU101 is inputted by R6 and the second electric capacity C2 obtains benchmark dividing potential drop after carrying out divider filter
Signal, inputs the in-phase input end 1 of the first voltage comparator U1 by benchmark voltage division signal.
Optionally, as it is shown on figure 3, the first feedback circuit 1023 includes the 3rd electric capacity C3 and the 7th resistance R7, the
Second end of three electric capacity C3 connects the inverting input 2 of the first voltage comparator U1, the first of the 3rd electric capacity C3
End connects first end of the 7th resistance R7, and second end of the 7th resistance R7 connects the defeated of the first voltage comparator U1
Go out end 3.
In this utility model embodiment, RC series connection (the 3rd electric capacity C3 and the 7th resistance R7) feedback can eliminate
The self-oscillation of the first voltage comparator U1.
Optionally, as in figure 2 it is shown, electric current loop module includes second bleeder circuit the 1031, second divider filter electricity
Road the 1032, second voltage comparator U2 and the second feedback circuit 1033, wherein:
The input 132 of the second bleeder circuit 1031 connects the current sample end 152 of LED output circuit, and second
The outfan of bleeder circuit 1031 connects the inverting input 7 of the second voltage comparator U2, the second divider filter electricity
The input 131 on road 1032 connects second outfan 112 of MCU101, the second pressure filter circuit 1032 defeated
Go out the in-phase input end 6 that end connects the second voltage comparator U2, the inverting input 7 of the second voltage comparator U2
And it is connected the second feedback circuit 1033 between the outfan 8 of the second voltage comparator U2；
Second bleeder circuit 1031 obtains after sampled current signals is carried out dividing potential drop sampling shunting signal output to the
The inverting input 7 of two voltage comparator U2, current reference signal dividing potential drop is filtered by the second pressure filter circuit 1032
Obtain benchmark shunting signal after ripple, benchmark shunting signal is inputted the in-phase input end of the second voltage comparator U2
6。
In this utility model embodiment, the feeder ear 9 of the second voltage comparator U2 connects 12V DC voltage, and second
Earth terminal 10 ground connection of voltage comparator U2, after the second bleeder circuit 1031 carries out dividing potential drop to sampled current signals
Obtain sampling shunting signal and export the inverting input 7 to the second voltage comparator U2, the second pressure filter circuit
Obtain benchmark shunting signal after 1032 pairs of current reference signal divider filter, benchmark shunting signal is inputted second
The in-phase input end 6 of voltage comparator U2, the second voltage comparator U2 is according to benchmark shunting signal and sampling point
The difference of stream signal exports different level signals to control circuit 104.If benchmark shunting signal and sampling shunting
The difference of signal be on the occasion of, the second voltage comparator U1 output is high level to the level signal of control circuit 104
Signal, if benchmark shunting signal is the biggest with the difference of sampling shunting signal, the second voltage comparator U2 exports extremely
The high level signal of control circuit 104 is the biggest, and control circuit 104 is defeated to LED according to the output of this high level signal
Going out the electric current of circuit 105, to heighten control signal the biggest, and electric current heightens control signal for heightening LED output circuit
The operating current of 105, it is the biggest that electric current heightens control signal, heightening of the operating current of LED output circuit 105
Amplitude is the biggest；If benchmark shunting signal is negative value with the difference of sampling shunting signal, the second voltage comparator U1
Output is low level signal to the level signal of control circuit 104, if benchmark shunting signal and sampling shunting signal
The absolute value of difference the biggest, the low level signal of the second voltage comparator U1 output to control circuit 104 is more
Little, control circuit 104 turns down control letter according to the electric current of this low level signal output to LED output circuit 105
Number the biggest, electric current turns down control signal for turning down the operating current of LED output circuit 105, and electric current turns down control
Signal processed is the biggest, the operating current of LED output circuit 105 to turn down amplitude the biggest.
Optionally, as it is shown on figure 3, the second pressure filter circuit 1032 include the 8th resistance R8, the 9th resistance R9,
Tenth resistance R10, the 4th electric capacity C4 and the 5th electric capacity C5, first end of the 8th resistance R8 connects MCU101
The second outfan 112, the 8th resistance R8 second end connect first end of the tenth resistance R10, the 4th electric capacity
First end of C1, first end of the 5th electric capacity C5 and first end of the 9th resistance R9, the of the tenth resistance R10
Two ends, second end of the 4th electric capacity C4 and the second end ground connection of the 5th electric capacity C5, second end of the 9th resistance R9
Connect the in-phase input end 6 of the second voltage comparator U2.
In this utility model embodiment, the second pressure filter circuit 1032 is by the 8th resistance R8, the 9th resistance
The current reference signal that MCU101 is inputted by R9, the tenth resistance R10, the 4th electric capacity C4 and the 5th electric capacity C5
Obtain benchmark shunting signal after carrying out divider filter, benchmark shunting signal is inputted the second voltage comparator U2's
In-phase input end 6.
Optionally, as it is shown on figure 3, the second bleeder circuit 1031 includes the 11st resistance R11 and the 6th electric capacity C6,
First end of the 11st resistance R11 connects the current sample end 152 of LED output circuit 105, the 11st resistance
Second end of R11 connects the first end and the inverting input 7 of the second voltage comparator U2 of the 6th electric capacity C6, the
The second end ground connection of six electric capacity C6.
In this utility model embodiment, the second bleeder circuit 1031 is by the 11st resistance R11 and the 6th electric capacity C6
The sampled current signals obtaining current sample end 152 sampling of LED output circuit 105 obtains after carrying out dividing potential drop
Sampling shunting signal exports the inverting input 7 to the second voltage comparator U2.
Optionally, as it is shown on figure 3, the second feedback circuit 1033 includes the 12nd resistance R12, the 7th electric capacity C7
With the 8th electric capacity C8, first end of the 12nd resistance R12 connects the outfan 8 and of the second voltage comparator U2
First end of eight electric capacity C8, first end of second end connection the 7th electric capacity C7 of the 12nd resistance R12, the 7th
Second end of electric capacity C7 connects the second end and the inverting input of the second voltage comparator U2 of the 8th electric capacity C8
7。
In this utility model embodiment, the 12nd resistance R12, the 7th electric capacity C7 and the 8th electric capacity C8 form
Second feedback circuit can eliminate the self-oscillation of the second voltage comparator U2.
Optionally, as it is shown on figure 3, the in-phase input end 6 of the second voltage comparator U2 and the second voltage comparator
Connecting the 9th electric capacity C9 between the inverting input 7 of U2, first end of the 9th electric capacity C9 connects the second voltage ratio
The relatively in-phase input end of device U2, second end of the 9th electric capacity C9 connects the anti-phase input of the second voltage comparator U2
End 7.
In this utility model embodiment, the 9th electric capacity C9 is used for filtering.
It should be noted that the first end of the electric capacity in this utility model embodiment refers generally to the positive pole of electric capacity,
Second end of electric capacity refers generally to the negative pole of electric capacity, and the first end and second end of resistance are as broad as long.
A kind of invariable power LED drive power circuit system provided this utility model embodiment above is carried out
Being discussed in detail, principle of the present utility model and embodiment are explained by specific case used herein
Stating, the explanation of above example is only intended to help to understand method of the present utility model and core concept thereof；With
Time, for one of ordinary skill in the art, according to thought of the present utility model, in detailed description of the invention and
All will change in range of application, in sum, this specification content should not be construed as this practicality new
The restriction of type.
Claims (10)
1. an invariable power LED drive power circuit system, it is characterised in that include host computer, microcontroller
Unit MCU, Voltage loop module, electric current loop module, control circuit and LED output circuit, wherein:
The input controlling the end described MCU of connection of described host computer, first outfan of described MCU connects
The first input end of described Voltage loop module, it is defeated that the second input of described Voltage loop module connects described LED
Going out the voltage sample end of circuit, the outfan of described Voltage loop module connects the input of described control circuit,
The outfan of described control circuit connects the input of described LED output circuit；Second output of described MCU
End connects the first input end of described electric current loop module, and the second input of described electric current loop module connects described
The current sample end of LED output circuit, the outfan of described electric current loop module connects the defeated of described control circuit
Enter end；
Described host computer sends a control signal to described MCU, described MCU and generates electricity according to described control signal
Pressure reference signal and current reference signal, first outfan of described MCU exports described voltage reference signal extremely
The first input end of described Voltage loop module, second outfan of described MCU exports described current reference signal
To the first input end of described electric current loop module, wherein, described voltage reference signal is believed with described current reference
Number amass as definite value；Second input of described Voltage loop module gathers the sampling electricity of described LED output circuit
Pressure signal, the second input of described electric current loop module gathers the sampled current signals of described LED output circuit；
When the load in described LED output circuit is constant voltage load or zero load, described Voltage loop module is according to described
Voltage reference signal exports the first level signal extremely described control circuit with the difference of described sampled voltage signal,
Described control circuit according to described first level signal output voltage control signal to described LED output circuit,
To control the running voltage of described LED output circuit；When the load in described LED output circuit is Constant Current Load
Time, described electric current loop module is according to the difference output of described current reference signal and described sampled current signals the
Two level signals are to described control circuit, and described control circuit is according to described second electrical level signal output current control
Signal processed is to described LED output circuit, to control the operating current of described LED output circuit.
System the most according to claim 1, it is characterised in that described Voltage loop module includes first point
Volt circuit, the first pressure filter circuit, the first voltage comparator and the first feedback circuit, wherein:
The input of described first bleeder circuit connects the voltage sample end of described LED output circuit, and described the
The outfan of one bleeder circuit connects the inverting input of described first voltage comparator, described first dividing potential drop filter
The input of wave circuit connects first outfan of described MCU, the outfan of described first pressure filter circuit
Connect the in-phase input end of described first voltage comparator, the inverting input of described first voltage comparator with
Described first feedback circuit is connected between the outfan of described first voltage comparator；
Described first bleeder circuit obtains voltage division signal output of sampling after described sampled voltage signal is carried out dividing potential drop
To the inverting input of described first voltage comparator, described first pressure filter circuit is to described voltage reference
Obtain benchmark voltage division signal after signal divider filter, described benchmark voltage division signal is inputted described first voltage ratio
The in-phase input end of relatively device.
System the most according to claim 2, it is characterised in that described first bleeder circuit includes first
Resistance, the second resistance, the 3rd resistance, the 4th resistance and the first electric capacity, the first end of described first resistance is even
Connect voltage sample end and first end of described second resistance of described LED output circuit, described first resistance
Second end connects the first end of described first electric capacity, and the second end of described first electric capacity connects described second resistance
The second end, the first end of described 3rd resistance and the first end of described 4th resistance, described 3rd resistance
Second end connects the inverting input of described first voltage comparator, the second end ground connection of described 4th resistance.
System the most according to claim 3, it is characterised in that described first pressure filter circuit includes
5th resistance, the 6th resistance and the second electric capacity, the first end of described 5th resistance connects the first of described MCU
Outfan, the second end of described 5th resistance connects the first end of described 6th resistance, described second electric capacity
First end and the in-phase input end of described first voltage comparator, the second end of described 6th resistance and described
Second end ground connection of two electric capacity.
System the most according to claim 4, it is characterised in that described first feedback circuit includes the 3rd
Electric capacity and the 7th resistance, the second end of described 3rd electric capacity connects the anti-phase input of described first voltage comparator
End, the first end of described 3rd electric capacity connects the first end of described 7th resistance, the second of described 7th resistance
End connects the outfan of described first voltage comparator.
6. according to the system described in any one of Claims 1 to 5, it is characterised in that described electric current loop module bag
Include the second bleeder circuit, the second pressure filter circuit, the second voltage comparator and the second feedback circuit, wherein:
The input of described second bleeder circuit connects the current sample end of described LED output circuit, and described the
The outfan of two bleeder circuits connects the inverting input of described second voltage comparator, described second dividing potential drop filter
The input of wave circuit connects second outfan of described MCU, the outfan of described second pressure filter circuit
Connect the in-phase input end of described second voltage comparator, the inverting input of described second voltage comparator with
Described second feedback circuit is connected between the outfan of described second voltage comparator；
Described second bleeder circuit obtains shunting signal output of sampling after described sampled current signals is carried out dividing potential drop
To the inverting input of described second voltage comparator, described second pressure filter circuit is to described current reference
Obtain benchmark shunting signal after signal divider filter, described benchmark shunting signal is inputted described second voltage ratio
The in-phase input end of relatively device.
System the most according to claim 6, it is characterised in that described second pressure filter circuit includes
8th resistance, the 9th resistance, the tenth resistance, the 4th electric capacity and the 5th electric capacity, the first of described 8th resistance
End connects second outfan of described MCU, and the second end of described 8th resistance connects the of described tenth resistance
One end, the first end of described 4th electric capacity, the first end of described 5th electric capacity and the first of described 9th resistance
End, the second end of described tenth resistance, the second end of described 4th electric capacity and the second end of described 5th electric capacity
Ground connection, the second end of described 9th resistance connects the in-phase input end of described second voltage comparator.
System the most according to claim 7, it is characterised in that described second bleeder circuit includes the tenth
One resistance and the 6th electric capacity, the first end of described 11st resistance connects the electric current of described LED output circuit and adopts
Sample end, the second end of described 11st resistance connects the first end of described 6th electric capacity and described second voltage ratio
The inverting input of relatively device, the second end ground connection of described 6th electric capacity.
System the most according to claim 8, it is characterised in that described second feedback circuit includes the tenth
Two resistance, the 7th electric capacity and the 8th electric capacity, the first end of described 12nd resistance connects described second voltage ratio
The outfan of relatively device and the first end of described 8th electric capacity, the second end of described 12nd resistance connects described the
First end of seven electric capacity, the second end of described 7th electric capacity connects second end and described the of described 8th electric capacity
The inverting input of two voltage comparators.
System the most according to claim 9, it is characterised in that the homophase of described second voltage comparator
The 9th electric capacity, described 9th electric capacity it is connected between input and the inverting input of described second voltage comparator
First end connect described second voltage comparator in-phase input end, described 9th electric capacity second end connect
The inverting input of described second voltage comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620009372.5U CN205491284U (en) | 2016-01-05 | 2016-01-05 | Permanent power LED power supply circuit system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620009372.5U CN205491284U (en) | 2016-01-05 | 2016-01-05 | Permanent power LED power supply circuit system |
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| CN205491284U true CN205491284U (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620009372.5U Active CN205491284U (en) | 2016-01-05 | 2016-01-05 | Permanent power LED power supply circuit system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
-
2016
- 2016-01-05 CN CN201620009372.5U patent/CN205491284U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105592590B (en) * | 2016-01-05 | 2017-09-05 | 茂硕电源科技股份有限公司 | A kind of invariable power LED drive power circuit system |
| 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 |
| WO2020082689A1 (en) * | 2018-10-23 | 2020-04-30 | 深圳市崧盛电子股份有限公司 | 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 |
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