CN106211485A - Current control circuit and apply its LED drive circuit - Google Patents
Current control circuit and apply its LED drive circuit Download PDFInfo
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- CN106211485A CN106211485A CN201610795732.3A CN201610795732A CN106211485A CN 106211485 A CN106211485 A CN 106211485A CN 201610795732 A CN201610795732 A CN 201610795732A CN 106211485 A CN106211485 A CN 106211485A
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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]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
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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]
- H05B45/10—Controlling the intensity of the light
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
Abstract
The invention discloses a kind of current control circuit and apply its LED drive circuit, current control circuit is used in the middle of LED drive circuit by the present invention, electric current inflow current control circuit in LED load, the electric current of LED load is flowed through by electric current control and regulation, described current control circuit is integrated in chip, first resistance of off-chip is only intended to arrange load current, without flow through big electric current on it, therefore conventional, electric-resistance can be used, reduce the cost of system, the sampling resistor of the present invention is integrated in sheet, even if the first resistance is short-circuited, then carry out current limliting by clamp circuit, it is unlikely damage load and adjusts pipe；Meanwhile, the present invention can compatible multiple dimmer application.
Description
Technical field
The present invention relates to electric and electronic technical field, be specifically related to a kind of current control circuit and apply its LED to drive
Circuit.
Background technology
LED is due to its ratio traditional fluorescent lamp and electric filament lamp energy-conserving and environment-protective, so LED is the most slowly replaced existing
Fluorescent lamp and electric filament lamp.Linear LED drive circuit realizes simple, the advantage of low cost with it, is used widely.
Fig. 1 is the linear LED drive circuit that prior art is conventional, the amplifier U00 grid electricity by regulation switching tube M01
Pressure so that sampling resistor R00 on, voltage is reference voltage VREF1, regulates by the size changing sampling resistor that to flow through LED negative
Electric current in load, thus realize the current constant control on LED.
All can flow through sampling resistor R00 due to LED load electric current, R00 resistance of sampling in the most above-mentioned prior art needs
Use power resistor, add the cost of drive scheme.In application process, if sampling resistor R00 is short-circuited, switching tube
The grid voltage of M01 can uprise, and causes M01 to enter saturation, causes output current run-away, be susceptible to LED and open
Pass pipe damages.
Additionally, the change of the promotion and application along with LED, more and more LED illumination occasions need to meet various light modulation need
Ask, and the linear LED drive circuit of above-mentioned prior art, it is impossible to realize PWM light modulation, simulation light modulation, controllable silicon light modulation etc. various
There is the occasion of light modulation demand, limit the application of LED load.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of being hardly damaged when off chip resistor is short-circuited to load and adjust
The current control circuit of homogeneous tube and apply its LED drive circuit, and compatible light modulation needs further, extends application model
Enclose, in order to solve the technical problem that prior art exists.
The technical solution of the present invention is to provide the current control circuit of a kind of following structure, including:
Adjusting pipe, with load in series, the first end of described adjustment pipe is connected with described load, its sampled resistance of the second end
Earthing potential；
Generating circuit from reference voltage, its input connects the first resistance or connection the first control voltage connects through the first resistance
Earth potential；Described generating circuit from reference voltage, according to the electric current of its input, produces reference voltage；Or its input connects the
One resistance is or/and first controls voltage ground current potential；Described generating circuit from reference voltage, according to the voltage of its input, produces ginseng
Examine voltage；
First amplifier, its outfan is connected with the control end of described adjustment pipe, the reference described in the reception of its first input end
Voltage, its second input receives to characterize and flows through the current sampling signal adjusting pipe transient current.
As preferably, described current control circuit is integrated circuit, adjusts the first end of pipe, generating circuit from reference voltage
Input and the earth terminal of sampling resistor as three pins of integrated circuit, the first described resistance is as discrete device position
In off-chip.
As preferably, the electric current of described its input of generating circuit from reference voltage is the first electric current, and the first electric current is through electricity
Traffic mirroring goes out the second electric current to resistance element, the second described electric current on described resistance element produced pressure drop as institute
State reference voltage.
As preferably, described generating circuit from reference voltage includes the second amplifier, the first transistor, current mirror module and
Two resistance, the first end of described second amplifier receives the reference signal characterizing the first current reference value, the of described second amplifier
Two ends receive the voltage of current control circuit input, and the outfan of the second amplifier connects with the control end of described the first transistor
Connect；First end of described the first transistor is connected with the input of described current mirror module, the second of described the first transistor
End receives the voltage of current control circuit input；The outfan of described current mirror module is connected with the second described resistance.
As preferably, described generating circuit from reference voltage includes the first current source, and the first described current source is with described
First resistance connect, the first current source on described first resistance produced pressure drop as described reference voltage.
As preferably, described current control circuit also includes clamp circuit, and described clamp circuit is to described first electricity
The voltage clamp of the resistance voltage at two ends, the voltage at the second resistance two ends or the first amplifier outfan is to voltage limiting value, to realize limit
Stream.
As preferably, the electricity that the first described resistance is variable resistance or variable resistance is formed with fixed resistance connection in series-parallel
Resistance group.
As preferably, the first described resistance is connected to dim signal block coupled in series or by described dim signal module
Between input and the ground of generating circuit from reference voltage, described dim signal module is simulation dim signal or PWM light modulation letter
Number, according to described simulation dim signal or the change of PWM dim signal, change the electric current flowing through load, to realize light modulation.
The LED of the applied current control circuit that another technical solution of the present invention is to provide a kind of following structure drives
Galvanic electricity road, including LED load and any one current control circuit above-mentioned, the rectified bridge of alternating current power supply obtains input voltage to institute
The LED load stated is powered.
The LED of the applied current control circuit that the another technical solution of the present invention is to provide a kind of following structure drives
Galvanic electricity road, including LED load, the first current control circuit and the second current control circuit, alternating current power supply is successively through thyristor regulating
Light device and rectifier bridge obtain input voltage and power described LED load, and the first described current control circuit is born with described LED
Carrying series connection, the first described current control circuit is any one current control circuit above-mentioned, and the second described electric current controls electricity
First end on road is connected through the hot end of power resistor with described input voltage, its second end and the low electricity of described input voltage
Position end connects.
As preferably, when input voltage is more than the pressure drop at LED load two ends, then the first current control circuit controls described
The electric current of LED load be fixed value, when input voltage is less than the pressure drop at LED load two ends, the electric current of LED load is zero,
Now, the second described current control circuit produces supplemental current, so that input current is not less than the maintenance of controllable silicon dimmer
Electric current.
As preferably, the second described current control circuit is also any of the above one current control circuit, this electric current control
The first resistance in circuit processed includes that two resistance connected, the common port of the resistance of two series connection control with described first electric current
The earth potential of circuit connects.
As preferably, the second described current control circuit is also any of the above one current control circuit, this electric current control
In the first resistance in circuit processed and the first current control circuit, the input of generating circuit from reference voltage connects.
Use the circuit structure of the present invention, compared with prior art, have the advantage that the present invention is by current control circuit
In the middle of LED drive circuit, electric current inflow current control circuit in LED load, flow through LED load by electric current control and regulation
Electric current, described current control circuit is integrated in chip, and the first resistance of off-chip is only intended to arrange load current, on it
Without flow through big electric current, therefore can use conventional, electric-resistance, reduce the cost of system, the sampling resistor of the present invention is integrated in sheet
In, even if the first resistance is short-circuited, then carry out current limliting by clamp circuit, be unlikely damage load and adjust pipe；Meanwhile, originally
Invention can compatible multiple dimmer application.
Accompanying drawing explanation
Fig. 1 is the LED drive circuit schematic diagram of prior art；
Fig. 2 is the circuit structure diagram of current control circuit embodiment one of the present invention；
Fig. 3 (a) is a kind of electrical block diagram of reference voltage circuit；
Fig. 3 (b) is the another kind of electrical block diagram of reference voltage circuit；
Fig. 4 (a) is the circuit structure diagram of current control circuit embodiment two of the present invention；
Fig. 4 (b) is the embodiment of the present invention two dimming curve figure when using Fig. 3 (a) scheme；
Fig. 4 (c) is the embodiment of the present invention two dimming curve figure when using Fig. 3 (b) scheme；
Fig. 5 (a) is the circuit structure diagram of current control circuit embodiment three of the present invention；
Fig. 5 (b) is the embodiment of the present invention three dimming curve figure when using Fig. 3 (a) scheme；
Fig. 5 (c) is the embodiment of the present invention three dimming curve figure when using Fig. 3 (b) scheme；
Fig. 6 (a) is the circuit structure diagram of current control circuit embodiment four of the present invention；
Fig. 6 (b) is the embodiment of the present invention four dimming curve figure when using Fig. 3 (a) scheme；
Fig. 6 (c) is the embodiment of the present invention four dimming curve figure when using Fig. 3 (b) scheme；
Fig. 7 is a kind of circuit structure diagram of LED drive circuit of the present invention；
Fig. 8 is the another kind of circuit structure diagram of LED drive circuit of the present invention；
Fig. 9 (a) Fig. 9 (b) is embodiment input voltage VIN and input under different thyristor operating angles of Fig. 7 of the present invention
The oscillogram of electric current iIN.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail, but the present invention is not restricted to these
Embodiment.The present invention contains any replacement, amendment, equivalent method and scheme made in the spirit and scope of the present invention.
Understand thoroughly to make the public that the present invention to be had, be described in detail concrete in present invention below preferred embodiment
Details, and do not have the description of these details can also understand the present invention completely for a person skilled in the art.
Referring to the drawings the present invention the most more particularly described below in the following passage.It should be noted that, accompanying drawing is all adopted
By the form more simplified and all use non-ratio accurately, only in order to convenient, aid in illustrating the embodiment of the present invention lucidly
Purpose.
With reference to shown in Fig. 2, illustrate the particular circuit configurations of current control circuit embodiment one of the present invention, and give this
Invention application in LED drive circuit.Its load is as a example by LED, and its input power is exchange input, described exchange input warp
Exporting the input voltage of direct current after rectifier bridge, i.e. as the input voltage of load, described rectifier bridge is by diode D01～D04
Composition.Current control circuit in the present embodiment includes adjusting pipe M01, generating circuit from reference voltage U01 and the first amplifier U02,
Described adjustment pipe M01 connects with LED load, and first end of described adjustment pipe M01 is connected with described LED load, its second end
Sampled resistance R00 earthing potential；The input of generating circuit from reference voltage U01 connects the first resistance R02 and through the first resistance
Earthing potential, although the present embodiment accompanying drawing only describes the situation connecting the first resistance R02, but generating circuit from reference voltage U01
Input by connect first control voltage can also realize, i.e. with first control voltage replace on the first resistance R02
Pressure drop, described first controls voltage can need be configured and adjust according to circuit.In the present embodiment, described reference voltage produces
Raw circuit U 01, according to the pressure drop on described first resistance R02, produces reference voltage VREF0, by adjusting the first resistance R02's
Resistance can adjust the value of reference voltage VREF0.The outfan of generating circuit from reference voltage U01 and the first of the first amplifier U02
Input (positive input terminal) connects, and adjusts pipe M01 the second input (negative input end) reception sign and flows through adjustment pipe transient current
Current sampling signal, be i.e. connected to sampling resistor R00 and adjust the common port of the second end of pipe M01.First amplifier U02 defeated
Go out end to be connected with the control end of described adjustment pipe M01.
Described adjustment pipe M01 uses NMOS to realize, and its first end is drain electrode, and the second end is source electrode, and it controls end is grid
Pole, is only to illustrate with NMOS at this, and this can not constitute the restriction using other types to adjust pipe.First amplifier U02 is by control
System adjusts the grid voltage of pipe M01 so that the voltage on sampling resistor R00 is equal to VREF0, to realize regulation LED load
Electric current, in the case of not light modulation, it is possible to achieve output constant current.
As seen from Figure 2, described current control circuit is integrated circuit, adjusts first end (OUT terminal) of pipe, reference
The input (EXT end) of voltage generation circuit and the earth terminal (GND end) of sampling resistor are as three pins of integrated circuit, institute
The the first resistance R02 stated is positioned at off-chip as discrete device.
Owing to current control circuit is desirably integrated in chip, when it is integrated into a chips, on the first resistance R02 also
Without flow through LED current, it is only intended to arrange electric current in LED load, it is possible to select conventional, electric-resistance, reduces system schema
This.And sampling resistor R00 is integrated in sheet, it is not susceptible to short circuit phenomenon.
With reference to shown in Fig. 3 (a), illustrate the particular circuit configurations of generating circuit from reference voltage U01, i.e. a kind of realization side
Formula.Generating circuit from reference voltage U01 produces fixed voltage at EXT end, then flowing through the electric current of the first resistance R02 is that i01 is (as the
One electric current), generating circuit from reference voltage produces reference current Iref, flows through the second resistance R01 (as resistance element) and arrives ground,
Iref and the proportional relation of electric current i01, described reference current Iref (as the second electric current) produces pressure drop at the second resistance R01
And VREF0 as the reference voltage.For the concrete structure in this accompanying drawing, wherein, described generating circuit from reference voltage according to
Pressure drop on described first resistance R02 produces the first electric current i01, the first described electric current i01 and goes out the second electricity through current mirror mirror image
On stream Iref to resistance element R01, the second described electric current Iref pressure drop produced by described resistance element R01 is as institute
State reference voltage VREF0.
Further, described generating circuit from reference voltage includes the second amplifier U05, the first transistor M05, current mirror mould
Block and the second resistance R01, first end (positive input terminal) of described second amplifier U05 receives sign the first current reference value and (also may be used
Be considered to characterize the reference value of the first resistance drop) reference signal Vref, the second end (negative input of described second amplifier U05
End) receive the pressure drop on the first resistance R02, the outfan of the second amplifier U05 connects with the control end of described the first transistor M05
Connect；First end of described the first transistor M05 is connected with the input of described current mirror module, described the first transistor M05
The second end connect the first resistance and through the first resistance eutral grounding current potential；The outfan of described current mirror module and described second
Resistance R01 connects.Described current mirror module is made up of two PMOS M06 and M07.
The first transistor M05 is as a example by NMOS, and it controls end is grid, and its first end is drain electrode, and its second end is source electrode.
Second amplifier U05 is by controlling the grid of the first transistor M05, thus controlling the voltage on resistance R02 is reference voltage Vref,
PMOS M06 and M07 forms current mirror so that the current in proportion relation of electric current Iref and M06 on M07, i.e. electric current on M07
With the current in proportion relation on resistance R02.If M06 and M07 is PMOS, breadth length ratio is respectively (W/L) and k1 (W/L),
Then M07 electric current and M06 current ratio are k1 (k1 is any number), then flowing through LED load size of current is k1* (R01/R00) *
Vref/R02。
Fig. 3 (a) further illustrates clamp circuit U03, clamp circuit U03 and the second resistance R01 is in parallel.Owing to there is clamper
Circuit U 03, even if being short-circuited for setting the first resistance R02 of electric current, output electric current can also be controlled in VCLAMP/
R00, wherein, VCLAMP is the clamp voltage of clamp circuit.When current control circuit is integrated into a chips, current sample electricity
Resistance R00 is integrated in chip internal, it is to avoid sampling resistor short circuit in traditional scheme, causes output electric current is excessive and cause system to damage
Bad.
The way of LED current current limliting is not limited only to above-mentioned described that clamp circuit U03 and resistance R01 is in parallel, it is also possible to
In generating circuit from reference voltage U01, carry out current limliting, thus ensure that on R01, voltage is not above certain value；Can also be first
The outfan of amplifier U02 carries out voltage clamp, thus limits LED current.
With reference to shown in Fig. 3 (b), illustrate the particular circuit configurations of generating circuit from reference voltage U01, i.e. another kind of realization side
Formula.In this accompanying drawing, described generating circuit from reference voltage U01 include the first current source I15, the first described current source I15 with
Described first resistance R02 connects, the first current source I15 on described first resistance R02 produced pressure drop as described ginseng
Examine voltage VREF0.Based on integrated circuit, then internal current source I15 of generating circuit from reference voltage U01 produces fixing at EXT end
Electric current, then the voltage on the first resistance R02 is VREF0.For the setting of clamp circuit U03, then can be by clamp circuit U03 and electricity
Resistance R02 is in parallel, the voltage of clamper VREF0.When VREF0 is for reaching clamp voltage, VREF0=I15*R02, then LED current is big
Little for I15*R02/R00, thus load is carried out current limliting.
With reference to shown in Fig. 4 (a), illustrate the circuit structure principle of current control circuit embodiment two of the present invention, with enforcement
Improved on the basis of example one, i.e. added the function of light modulation.The present embodiment make use of the first resistance R02 to arrange electric current
Characteristic, i.e. change the first resistance R02 and can change load current, to realize light modulation, therefore the first resistance R02 is arranged to variable
Resistance or variable resistance group, such as, adjustable resistance R02 can also be in series or in parallel with a fixed resistance and an adjustable resistance
Mode realizes.
When generating circuit from reference voltage U01 uses the scheme of Fig. 3 (a), LED current size is k1* as previously described
(R01/R00) * Vref/R02, i.e. resistance R02 is the biggest, and output electric current is the least；Resistance R02 is the least, and output electric current is the biggest.By pincers
Position circuit limits maximum output current, shown in dimming curve such as Fig. 4 (b)；When generating circuit from reference voltage U01 uses Fig. 3 (b)
Scheme time, LED current size is I15*R02/R00 as previously described, i.e. resistance R02 is the biggest, output electric current the biggest；Resistance
R02 is the least, and output electric current is the least.Maximum output current is limited, shown in dimming curve such as Fig. 4 (c) by clamp circuit.
With reference to shown in Fig. 5 (a), illustrate the circuit structure principle of current control circuit embodiment three of the present invention, with enforcement
Add the function of simulation light modulation on the basis of example one, i.e. dim different with the employing variable resistance in embodiment two.Institute
The the first resistance R02 stated and dim signal block coupled in series, dim signal module described in the present embodiment is simulation light modulation letter
Number U11, changes the electric current flowing through LED load according to described simulation dim signal U11, to realize dimming.When simulation dim signal
During U11 and resistance R02 series connection, simulation dim signal U11 can be with R02 transposition.
As a example by concrete annexation in Fig. 5 (a), when scheme during generating circuit from reference voltage uses Fig. 3 (a),
The dimmer voltage characterizing simulation dim signal is the highest, then the electric current of LED is the least；Analog voltage is the lowest, and LED current is the biggest.Work as table
Levying the dimmer voltage of simulation dim signal when being 0, LED current size and size when being added without simulation dim signal are identical, when
During the reference voltage Vref that the dimmer voltage characterizing simulation dim signal reaches in generating circuit from reference voltage, then output electric current is
0.Shown in dimming curve such as Fig. 5 (b), wherein i be simulation dim signal be LED current size when 0.When reference voltage produces electricity
When road uses the scheme in Fig. 3 (b), if the voltage of simulation dim signal is the highest, then the electric current of LED is the biggest；Analog voltage is the lowest,
LED current is the least.Shown in dimming curve such as Fig. 5 (c), wherein i be simulation dim signal be LED current size when 0.Work as simulation
When voltage is 0, LED current size is identical with size when being added without simulating dim signal.When resistance R02 is 0, i.e. only simulation
When dim signal is connected between EXT end and ground, LED current can be to 0.
With reference to shown in Fig. 6 (a), illustrate the circuit structure principle of current control circuit embodiment four of the present invention, with enforcement
Add the function of PWM light modulation on the basis of example one, i.e. have with the employing variable resistance in embodiment two and three and simulation light modulation
Institute is different.PWM dim signal U10 and R02 is connected, is connected between EXT end and the ground of current control circuit to realize.Its
In, PWM voltage dim signal U10 can be with R02 transposition.Directly PWM dim signal U10 can also be connected to EXT end
And between ground.
The present embodiment is when using the generating circuit from reference voltage shown in Fig. 3 (a), when pwm signal is high, and the wink of LED
Time electric current be 0；When pwm signal is low, the transient current of LED is maximum, the value not dimmed.Wherein, the height of pwm signal
Level needs higher than reference voltage Vref, and the low level of pwm signal is 0.Then the average current of LED is i* (1-D).Wherein, i is
LED current during non-dimmable, D is the percentage ratio that pwm signal high level accounts for switch periods.Shown in dimming curve such as Fig. 6 (b).When
When using the generating circuit from reference voltage shown in Fig. 3 (b), when pwm signal is high, the transient current of LED is maximum；When
When pwm signal is low, the transient current of LED is the value not dimmed.Wherein, the low level of pwm signal is 0, then the average electricity of LED
Stream is i+ (V3/R00) * D.Wherein, i is LED current during non-dimmable, and V3 is the value of PWM dim signal high level, wherein,
I15*R02+V3 is less than clamped voltage value.When I15*R02+V3 is more than or equal to clamped voltage value, then LED average current size is
VCLAMP*D/R00+i(1-D).Shown in dimming curve such as Fig. 6 (c).
With reference to shown in Fig. 7, illustrate the particular circuit configurations of the LED drive circuit of the present invention.The rectified bridge of alternating current power supply
Obtaining input voltage VIN to load supplying, C01 is input capacitance.Described LED drive circuit includes LED load, the first electric current
Control circuit U15 and the second current control circuit U16, alternating current power supply obtains input electricity through controllable silicon dimmer and rectifier bridge successively
Described LED load is powered by pressure VIN, and the first described current control circuit is connected with described LED load, the first described electricity
Flow control circuit U15 is any one current control circuit above-mentioned, and first end of the second described current control circuit U16 is through merit
Rate resistance R12 is connected with the hot end of described input voltage VIN, its second end and the cold end of described input voltage VIN
Connect.
When input voltage VIN adds the cut-in voltage of the first current control circuit U15 more than the pressure drop at LED load two ends
(the first current control circuit U15 cut-in voltage refers to that between OUT and GND, minimum voltage ensure that the first current control circuit can
With normal work), then the electric current of the LED load described in the first current control circuit U15 control is fixed value, works as input voltage
When VIN adds the cut-in voltage of the first current control circuit U15 less than the pressure drop at LED load two ends, the electric current of LED load is
Zero, now, the second described current control circuit U16 produces supplemental current, so that input current is not less than controllable silicon dimmer
Maintenance electric current.
The second described current control circuit U16 is also any of the above one current control circuit, this current control circuit
In the first resistance include two resistance connected, i.e. R11 and R10, the common port of the resistance of two series connection and described first electricity
The earth potential of flow control circuit U15 connects.
It is described as follows based on accompanying drawing 7 concrete structure: the positive output end of input rectifying bridge is connected to the one of power resistor R12
End, the other end of power resistor R12 is connected to the OUT terminal of current control circuit U16, and the ground of current control circuit U16 is connected to
The negative output terminal of input rectifying bridge.The EXT end of current control circuit U16 is connected to electricity through resistance R10 and R11 of two series connection
The ground of flow control circuit U16.The positive input terminal of rectifier bridge is also connected to the anode of LED load, and the negative terminal of LED load is connected to electricity
The OUT terminal of flow control circuit U15, resistance R02 is connected between EXT end and the GND of current control circuit U15, and electric current controls electricity
The ground of road U15 is connected to resistance R10 and the common port of resistance R11.
First resistance R02 arranges the output electric current of LED, when input voltage VIN is more than LED voltage VLED, then and electric current control
It is I2 that circuit U 15 processed controls LED current size by output current setting resistance R02；When input voltage VIN is less than LED voltage
During VLED, then on LED, electric current is 0.When input voltage is less than LED voltage, LED current is 0, then input needs to add necessarily
Maintenance electric current so that controllable silicon be always maintained at conducting, prevent shutoff from causing flicker.When LED has electric current, then LED current stream
Cross resistance R11, resistance R11 produces a constant pressure drop.The electric current flowed out due to EXT end is much smaller than LED current, is therefore calculating
During the electric current of R12, the size of current that can be approximately considered power resistor R12 is: K* (Vref-iLED*R11)/R10；Wherein K is
Coefficient in current control circuit, when the circuit of employing Fig. 3 (a), and M06:M07=1:1, then K=(R01/R00).Therefore
LED current is the biggest, then the electric current on power resistor R12 is the least, when iLED*R11 is more than or equal to Vref, then and power resistor R12
On electric current be 0.When LED current is 0, owing to resistance R11 is much smaller than resistance R10, therefore on power resistor, size of current is
K*Vref/R10=I1.When different controlled silicon conducting angle, input voltage VIN and input current iIN waveform such as Fig. 9 (a) and 9
Shown in (b).By adding current control circuit U16 and peripheral circuit so that when input voltage is less than LED voltage, input electricity
Stream can reach silicon controlled and maintain electric current, prevents silicon controlled from turning off and causes LED to flash.And this maintenance size of current
Can be arranged by resistance, circuit is simple, and circuit cost is low.
With reference to shown in Fig. 8, illustrate the another kind of particular circuit configurations of the LED drive circuit of the present invention.Work as input voltage
VIN adds cut-in voltage (the first current control circuit U15 of the first current control circuit U15 more than the pressure drop at LED load two ends
Cut-in voltage refers to that between OUT and GND, minimum voltage ensure that the first current control circuit can normally work), then the first electricity
The electric current of the LED load described in flow control circuit U15 control is fixed value, and the EXT of the second current control circuit U16 is higher than simultaneously
Internal reference voltage, does not has electric current to flow through R13, does not has electric current to flow through R12 yet；When input voltage VIN is less than LED load two ends
When pressure drop adds the cut-in voltage of the first current control circuit U15, the input EXT output electricity of the first current control circuit U15
Stream starts to reduce, and the input EXT of the second current control circuit U16 has electric current to flow through R13 simultaneously, now, and the second described electricity
Flow control circuit U16 produces supplemental current and flows through R12, so that input current is not less than the maintenance electric current of controllable silicon dimmer.The
The compensation electric current of two current control circuit U16 is determined by resistance R13 and R02.When the first electric current controls the EXT end output electricity of U15
When stream is zero, the compensation electric current of the second current control circuit U16 reaches maximum.
In addition, although above embodiment be separately illustrated and illustrate, but relating to the technology that part is common, in this area
Those of ordinary skill apparently, can be replaced between the embodiments and integrate, and relates to one of them embodiment and is not expressly recited
Content, then refer to another embodiment on the books.Relate to the part of resistance, it is also possible to be understood as resistor group, i.e.
Being made up of multiple resistance connection in series-parallel, such as, the first resistance can be understood as resistance R11 and R12 series connection.
Embodiments described above, is not intended that the restriction to this technical scheme protection domain.Any in above-mentioned enforcement
Amendment, equivalent and the improvement etc. made within the spirit of mode and principle, should be included in the protection model of this technical scheme
Within enclosing.
Claims (13)
1. a current control circuit, it is characterised in that: including:
Adjusting pipe, with load in series, the first end of described adjustment pipe is connected with described load, its sampled resistance eutral grounding of the second end
Current potential；
Generating circuit from reference voltage, its input connects the first resistance or connects the first control voltage through the first resistance eutral grounding
Current potential；Described generating circuit from reference voltage, according to the electric current of its input, produces reference voltage；Or its input connects first
Resistance is or/and first controls voltage ground current potential；Described generating circuit from reference voltage, according to the voltage of its input, produces reference
Voltage；
First amplifier, its outfan is connected with the control end of described adjustment pipe, the reference voltage described in the reception of its first input end,
Its second input receives to characterize and flows through the current sampling signal adjusting pipe transient current.
Current control circuit the most according to claim 1, it is characterised in that: described current control circuit is integrated electricity
Road, adjusts the earth terminal of the first end of pipe, the input of generating circuit from reference voltage and sampling resistor as the three of integrated circuit
Individual pin, the first described resistance is positioned at off-chip as discrete device.
Current control circuit the most according to claim 1, it is characterised in that: its input of described generating circuit from reference voltage
The electric current of end is the first electric current, and the first electric current goes out the second electric current to resistance element through current mirror, and the second described electric current exists
On described resistance element, produced pressure drop is as described reference voltage.
Current control circuit the most according to claim 3, it is characterised in that: described generating circuit from reference voltage includes
Two amplifiers, the first transistor, current mirror module and the second resistance, the first end of described second amplifier receives and characterizes the first electric current ginseng
Examining the reference signal of value, the second end of described second amplifier receives the voltage of current control circuit input, the second amplifier defeated
Go out end to be connected with the control end of described the first transistor；First end of described the first transistor and described current mirror module
Input connects, and the second end of described the first transistor receives the voltage of current control circuit input；Described current mirror mould
The outfan of block is connected with the second described resistance.
Current control circuit the most according to claim 1, it is characterised in that: described generating circuit from reference voltage includes
One current source, the first described current source is connected with the first described resistance, and the first current source is produced on described first resistance
Raw pressure drop is as described reference voltage.
6. according to the current control circuit described in any one in claim 1-5, it is characterised in that: described electric current controls electricity
Road also includes clamp circuit, described clamp circuit to the voltage at described first resistance two ends, the voltage at the second resistance two ends or
The voltage clamp of the first amplifier outfan is to voltage limiting value, to realize current limliting.
7. according to the current control circuit described in any one in claim 1-5, it is characterised in that: as preferably, described
First resistance is the resistor group that variable resistance or variable resistance are formed with fixed resistance connection in series-parallel.
8. according to the current control circuit described in any one in claim 1-5, it is characterised in that: the first described resistance with
Dim signal block coupled in series or described dim signal module is connected between the input of generating circuit from reference voltage and ground,
Described dim signal module is simulation dim signal or PWM dim signal, dims letter according to described simulation dim signal or PWM
Number change, change and flow through the electric current of load, to realize dimming.
9. the LED drive circuit of an applied current control circuit, it is characterised in that: include LED load and the claims
Any one current control circuit in 1-8, the rectified bridge of alternating current power supply obtains input voltage and powers described LED load.
10. the LED drive circuit of an applied current control circuit, it is characterised in that: include that LED load, the first electric current control
Circuit and the second current control circuit, alternating current power supply obtains input voltage to described through controllable silicon dimmer and rectifier bridge successively
LED load is powered, and the first described current control circuit is connected with described LED load, and the first described current control circuit is
Any one current control circuit of the claims 1-8, the first end of the second described current control circuit is through power resistor
Being connected with the hot end of described input voltage, its second end is connected with the cold end of described input voltage.
The LED drive circuit of 11. applied current control circuits according to claim 10, it is characterised in that: when input electricity
When pressure is more than the pressure drop at LED load two ends, then the electric current of the LED load described in the first current control circuit control is fixed value,
When input voltage is less than the pressure drop at LED load two ends, the electric current of LED load is zero, and now, the second described electric current controls electricity
Road produces supplemental current, so that input current is not less than the maintenance electric current of controllable silicon dimmer.
The LED drive circuit of 12. applied current control circuits according to claim 11, it is characterised in that: described
Two current control circuits are also any one current control circuit of above claim 1-8, first in this current control circuit
Resistance includes two resistance connected, and the common port of the resistance of two series connection is with the earth potential of described first current control circuit even
Connect.
The LED drive circuit of 13. applied current control circuits according to claim 11, it is characterised in that: described
Two current control circuits are also any one current control circuit of above claim 1-8, first in this current control circuit
In resistance and the first current control circuit, the input of generating circuit from reference voltage connects.
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| CN201610795732.3A CN106211485B (en) | 2016-08-31 | 2016-08-31 | Current control circuit and apply its LED drive circuit |
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| CN201610795732.3A CN106211485B (en) | 2016-08-31 | 2016-08-31 | Current control circuit and apply its LED drive circuit |
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| CN106211485B (en) | 2018-09-21 |
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