Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.
The utility model embodiment provides a kind of LED lamp and its regulation circuit, it is intended to solves existing LED lamp and deposits
Brightness adjustment approach is single the problem of.
Realization of the present utility model is described in detail below in conjunction with specific embodiment:
Fig. 1 shows a kind of structure of the regulation circuit of LED lamp of the utility model embodiment, for convenience of description, only
Show the part related to the utility model embodiment.
As shown in figure 1, a kind of regulation circuit 100 of LED lamp, is connected between constant voltage source 110 and LED load 120
It is connected, for adjusting the luminosity of LED load 120.The regulation circuit 100 of the LED lamp includes:Dimming unit 10, voltage
Switch unit 20 and constant current unit 30.
The Regulate signal input 11 of dimming unit 10 is used to input Regulate signal, the voltage input end of dimming unit 10 with
First output end of constant voltage source 110 is connected, the voltage input end of constant current unit 30 and the second output end phase of constant voltage source 110
Even, the signal output part of dimming unit 10 connects the signal input part of constant current unit 30 with the output end of voltage switching unit 20 altogether, permanent
Stream unit 30 the first signal output part be connected with the first end of LED load 120, the secondary signal output end of constant current unit 30 and
The end of LED load 120 second is connected.
Dimming unit 10 exports the second direct current according to the first direct current that constant voltage source 110 provides to constant current unit 30,
So that constant current unit 30 carries out constant current driving to LED load.
When being dimmed to LED load 120, the voltage of the second direct current is adjusted voltage switching unit 20;Or
The voltage of the second direct current is adjusted according to received dim signal for person's dimming unit 10;Or in voltage switching list
After the voltage of first 20 pair of second direct current is adjusted, dimming unit 10 is according to received dim signal to the second direct current
Voltage be adjusted.
It should be noted that voltage switching unit 20 can include multiple loads, selected not by voltage switching unit 20
With the load of resistance, and then the voltage of the signal output part of dimming unit 10 is reduced or raised, realize the electricity to the second direct current
Press the selection or switching of size.
It is understood that according to the difference of brightness requirement, the dim signal of selection can also be different.
The voltage input end of constant current unit 30 is connected with the second output end of constant voltage source 110, and constant voltage source 110 is to constant current
Unit 30 provides work electricity consumption of the 3rd direct current as constant current unit 30.
First signal output part of constant current unit 30 is connected with the first end of LED load 120, the secondary signal of constant current unit 30
Output end is connected with the end of LED load 120 second, wherein, the output current of constant current unit 30 is certain.
It is understood that when dimming unit 10 exports the second direct current according to the first direct current to constant current unit 30,
By voltage switching unit 20 and then change constant current unit 30 signal input part voltage, because constant current unit 30 is born to LED
The electric current for carrying 120 outputs is certain value, therefore when the voltage change of the signal input part of constant current unit 30, in order to keep constant current
The electric current that unit 30 exports to LED load 120 is constant, and the watt level of the second direct current of the input of constant current unit 30 is also with perseverance
Flow the voltage change of the signal input part of unit 30 and change, i.e., by switching the defeated of the dimming unit of voltage switching unit 20
The voltage for going out end changes, to realize the selection to the watt level of the second direct current.
When the power of the second direct current determines, change the voltage of the second direct current by connecting different Regulate signals
Size, and then the size of current of the second direct current as the voltage swing of the second direct current changes and changes, is realized to LED
The light modulation of load 120.
It should be noted that Regulate signal can include regulation voltage signal or PWM switch frequency signals, by connecting not
Same regulation voltage signal or PWM switch frequency signals, and then change the voltage swing of the second direct current, due to the second direct current
Power it has been determined that therefore by change the second direct current voltage swing, so as to change change the second direct current electric current it is big
It is small, realize the light modulation to LED load 120.
Fig. 2 shows a kind of physical circuit of the regulation circuit for LED lamp that the utility model embodiment provides.Such as Fig. 2
Shown, dimming unit 10 includes:First resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5,
One switching tube Q1, the first diode D1 and the first electric capacity C1.
First resistor R1 first end is the voltage input end of dimming unit, first resistor R1 the second end and second resistance
R2 first end connects first switch pipe Q1 hot end, second resistance R2 first end and the first diode D1 first end altogether
First switch pipe Q1 controlled end is connect altogether, first switch pipe Q1 controlled end is the Regulate signal input of dimming unit 10, the
One diode D1 the second end is connected with the 4th resistance R4 first end, the 4th resistance R4 the second end ground connection, first switch pipe
Q1 cold end is connected with 3rd resistor R3 first end, and 3rd resistor R3 the second end and the first electric capacity C1 first end are total to
The 5th resistance R5 first end is connect, the 5th resistance R5 first end is the signal output part of dimming unit 10, the first electric capacity C1's
Second end and the 5th resistance R5 the second end are grounded altogether.
It should be noted that when constant voltage source 110 provides the first direct current to dimming unit 10, the first direct current passes through
First switch pipe Q1 is flowed into after first resistor R1 and second resistance R2, then is flowed out by first switch pipe Q1 cold end, with the
Loop is formed between one switching tube Q1 controlled end.Wherein, the magnitude of voltage of the first direct current is because of first switch pipe Q1 tube voltage drop
And change, then after carrying out partial pressure by 3rd resistor R3 and the 5th resistance R5, exported by the signal output part of dimming unit 10.
Further, as shown in Fig. 2 voltage switching unit 20 includes:Multiple convert resistances (Rn, Rn+1 ... Rm) and load
Selecting switch SW1.
Load selector switch SW1 includes at least one idle end DIM and multiple load connection ends, the sky of load selector switch
Load end DIM is the output end of voltage switching unit 20, and first end and the load selection of multiple convert resistances (Rn, Rn+1 ... Rm) are opened
The multiple load connection ends for closing SW1 are respectively connected with, and the second end of multiple convert resistances (Rn, Rn+1 ... Rm) is grounded altogether.
It should be noted that because the signal output part of dimming unit 10 connects constant current altogether with the output end of voltage switching unit 20
The signal input part of unit 30, when stirring load selector switch SW1, and then select load selector switch idle end with it is multiple
Any resistance is connected in convert resistance (Rn, Rn+1 ... Rm) so that any electricity of multiple convert resistances (Rn, Rn+1 ... Rm)
Resistance forms parallel relationship with the 5th resistance R5 in dimming unit 10.
For example, the magnitude of voltage for making the first direct current is 10V, first switch pipe Q1 tube voltage drop is 0.6V, works as constant voltage source
110 to dimming unit 10 provide the first direct current when, the voltage Verf=between first switch pipe Q1 cold end and ground
10V-0.6V=9.4V.
When stirring load selector switch SW1 to idle end DIM, the electricity between first switch pipe Q1 cold end and ground
Pressure Verf obtains the second direct current after 3rd resistor R3 and the 5th resistance R5 are by partial pressure, and the voltage for making second direct current is
V1, wherein, V1=Verf × R5/ (R3+R5);Wherein, Verf is the voltage between first switch pipe Q1 cold end and ground
Value, R5 are the 5th resistance R5 resistance value, and R3 is 3rd resistor R3 resistance value.
When stirring load selector switch SW1 to convert resistance Rn ends, between first switch pipe Q1 cold end and ground
Voltage Verf by 3rd resistor R3 and the 5th resistance R5 with the parallel network that convert resistance Rn is formed by partial pressure, obtain second
Direct current, the voltage for making second direct current are Vn, wherein, Vn=Verf × (R5//Rn)/(R3+R5//Rn);Wherein, Verf
For the magnitude of voltage between first switch pipe Q1 cold end and ground, (R5//Rn) is that the 5th resistance R5 forms with convert resistance Rn
Parallel network resistance value, R3 be 3rd resistor R3 resistance value.
Identical, when stirring load selector switch SW1 to convert resistance Rm ends, first switch pipe Q1 cold end with
Voltage Verf between ground by 3rd resistor R3 and the 5th resistance R5 with the parallel network that convert resistance Rm is formed by partial pressure, obtain
To the second direct current, the voltage for making second direct current is Vm, wherein, Vm=Verf × (R5//Rm)/(R3+R5//Rm);Its
In, Verf is the magnitude of voltage between first switch pipe Q1 cold end and ground, and (R5//Rm), which is that the 5th resistance R5 is same, switches electricity
The resistance value of the parallel network of Rm compositions is hindered, R3 is 3rd resistor R3 resistance value.
Further, constant current unit 30 includes:First chip U1, the first inductance L1, the second inductance L2, the 6th resistance R6,
7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 11st resistance R11, the 12nd resistance R12, second
Electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6 and the 7th electric capacity C7.
Second diode D2 first end connects the 6th resistance R6 first end altogether with the 8th resistance R8 first end, and is formed
Control source node, control source node are the voltage input end of constant current unit 30, the 6th resistance R6 the second end and the 7th electricity
The second end that resistance R7 first end meets the first chip U1 Enable Pin EN, the 7th resistance R7 altogether is grounded, and the first of the 4th electric capacity C4
End and the first chip U1 voltage input end V_IN connect the second diode D1 first end, the 4th electric capacity C4 the second termination altogether
Ground, the 8th resistance R8 the second end are connected with the second electric capacity C2 first end, the second electric capacity C2 the second end and the second diode
D2 the second end connects the negative of the first chip U1 induction end LX, the first chip U1 voltage input end V_IN and the first chip U1 altogether
The 9th resistance R9, the tenth resistance R10 and the 11st resistance R11, the 3rd electric capacity C3 are parallel between the SEN of current detecting end successively
First end and the 12nd resistance R12 first end meet the first chip U1 signal input part TM altogether, the second of the 3rd electric capacity C3
End ground connection, the 12nd resistance R12 the second end are the signal input part of constant current unit 30, the first inductance L1 first end and first
Chip U1 induction end LX is connected, the first inductance L1 the second end, the of the 5th electric capacity C5 first end and the 6th electric capacity C6
One end connects the second inductance L1 first end altogether, the first chip U1 negative current test side SEN, the 5th electric capacity C5 the second end and
6th electric capacity C6 the second end connects the second inductance L2 the second end, the 7th electric capacity C7 first end and the 3rd of the second inductance L2 altogether
End is connected, and the 7th electric capacity C7 the second end is connected with the second inductance L2 the 4th end, and the 7th electric capacity C7 first end is constant current list
First signal output part of member 30, the secondary signal output end of the 7th electric capacity C7 the second end constant current unit 30.
It should be noted that dimming unit 10 exports the second direct current according to the first direct current to constant current unit 30, pass through
12nd resistance R12 the second end is inputted to the first chip U1 signal input part TM.
Due between the first chip U1 voltage input end V_IN and the first chip U1 negative current test side SEN successively simultaneously
Be associated with the 9th resistance R9, the tenth resistance R10 and the 11st resistance R11 so that the first chip U1 voltage input end V_IN with
Pressure difference is formed between first chip U1 negative current test side SEN.
It is understood that the first chip U1 in constant current unit 30 is according to the work of the second DC powered LED load 120
During work, the second inductance L2 is used to be filtered for the signal in constant current unit 30, then the first end by the 7th electric capacity C7
Exported with the second end end to LED load 120.
As an embodiment of the present utility model, first switch pipe is IGBT pipes, triode or metal-oxide-semiconductor.
Further, as the preferred embodiment of the utility model one, first switch pipe Q1 can be NPN type triode
Q1, NPN type triode Q1 base stage be first switch pipe Q1 controlled end, NPN type triode Q1 current collection extremely first switch
Pipe Q1 hot end, NPN type triode Q1 transmitting extremely first switch pipe Q1 cold end.
Further, as another preferred embodiment of the utility model, first switch pipe Q1 can be N-type metal-oxide-semiconductor Q1,
N-type metal-oxide-semiconductor Q1 grid is first switch pipe Q1 controlled end, and N-type metal-oxide-semiconductor Q1 drain electrode is first switch pipe Q1 high potential
End, N-type metal-oxide-semiconductor Q1 source electrode are first switch pipe Q1 cold end.
The another object of the present embodiment is to provide a kind of LED lamp 200, as shown in figure 3, LED lamp 200 includes LED
Load 120, include the regulation circuit 100 of LED lamp as described above.
Due to a kind of embodiment relevant with the utility model of LED lamp provided in the present embodiment and work
Principle in the above-described embodiments and elaborates, and therefore, here is omitted.
A kind of regulation circuit of LED lamp provided by the utility model, is connected between constant voltage source and LED load, should
Regulation circuit includes:Dimming unit, voltage switching unit and constant current unit;Dimming unit provided according to constant voltage source first
Direct current exports the second direct current to constant current unit, so that constant current unit carries out constant current driving to LED load;To LED load
When being dimmed, the voltage of the second direct current is adjusted voltage switching unit;Or dimming unit is according to received
The voltage of second direct current is adjusted dim signal;Or the voltage of the second direct current is adjusted in voltage switching unit
After section, the voltage of the second direct current is adjusted according to received dim signal for dimming unit, enriches regulation LED and bears
Carry the mode of brightness.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.