CN110515414A - A kind of constant-current control circuit, method and constant-current control device - Google Patents
A kind of constant-current control circuit, method and constant-current control device Download PDFInfo
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- CN110515414A CN110515414A CN201910894212.1A CN201910894212A CN110515414A CN 110515414 A CN110515414 A CN 110515414A CN 201910894212 A CN201910894212 A CN 201910894212A CN 110515414 A CN110515414 A CN 110515414A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004146 energy storage Methods 0.000 claims abstract description 53
- 238000001514 detection method Methods 0.000 claims abstract description 37
- 230000008878 coupling Effects 0.000 claims description 128
- 238000010168 coupling process Methods 0.000 claims description 128
- 238000005859 coupling reaction Methods 0.000 claims description 128
- 230000005347 demagnetization Effects 0.000 claims description 19
- 230000001939 inductive effect Effects 0.000 claims description 9
- 238000004804 winding Methods 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 7
- 230000005669 field effect Effects 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 10
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 230000002459 sustained effect Effects 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 1
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- 230000015556 catabolic process Effects 0.000 description 1
- 210000000080 chela (arthropods) Anatomy 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
Abstract
The present invention relates to technical field of integrated circuits, and in particular to a kind of constant-current control circuit, method, and using the constant-current control circuit or the constant-current control device of constant current control method.The constant-current control circuit includes: energy storage inductor, power switch, detection resistance, demagnetize time detection module, reference voltage modulation module and current peak control module；The constant-current control circuit realizes the current constant control under critical conduction mode by using pulse width modulating signal modulation reference voltage, so that the constant-current control circuit performance and cost are optimized.
Description
Technical field
The present invention relates to technical field of integrated circuits, and in particular to a kind of constant-current control circuit, method, and use institute
State the constant-current control device of constant-current control circuit or method.
Background technique
Figure 1A is a kind of existing constant-current control circuit, energy storage inductor L1 first end and input voltage VIN electric coupling, second
End is coupled with the input terminal of switching tube M1, at the same also with the anode electric coupling of sustained diode 1, the control terminal of switching tube M1 with
Interrupted constant-current control module output end electric coupling, the output end of switching tube M1 and the first end electric coupling of current sense resistor Rcs,
The second end of current sense resistor Rcs is grounded, the cathode and output capacitance C1 first end and load first end of sustained diode 1
Electric coupling, the output capacitance C1 second end and load second end and input voltage VIN electric coupling, the interrupted current constant control mould
The first input end and demagnetization time detection module output end electric coupling of block, the second input terminal of the interrupted constant-current control module
With current peak control module output end electric coupling, the first input end of the current peak control module and reference voltage electricity
Coupling, the first end electric coupling of the second input terminal and the detection resistance Rcs.
The existing constant-current control circuit exemplary operation waveform diagram in conjunction with shown in Figure 1B it is found that existing constant-current control circuit,
It is that existing constant-current control circuit will realize current constant control first there are two insufficient places, can only operate in energy storage inductor electricity
It flows under discontinuous mode.The demagnetization time Tdemg of energy storage inductor is obtained by detection energy storage inductor demagnetization end time point ZXC, is examined
The peak point current cut-off signals OFF for surveying energy storage inductor obtains the conducting charging time Ton of energy storage inductor, in combination with interrupted constant current
Timing circuit inside control module goes to realize Tdemg=Ton+Tfree, and the demagnetization time Tdemg of energy storage inductor is allowed to be equal to storage
The sum of the conducting charging time Ton and interrupted free oscillation time Tfree of energy inductance.From Figure 1B work wave it can be concluded that,
Average load current Iout=0.5*Ipk* (Tdemg/T)=0.5* (Vref/Rcs) * (Tdemg/T).Work as Tdemg=Ton+
When Tfree, T=2Tdemg, so average load current Iout=0.25* (Vref/Rcs), in order to realize different input voltages
Current constant control under VIN, Tfree time cannot be equal to zero, so constant-current control circuit can only operate in energy storage inductor electric current and break
It under Discontinuous Conduction mode, results in energy storage inductor current peak and becomes larger, it is desirable that larger sized switching tube M1 increases the cost of system；
Followed by constant-current control circuit work under energy storage inductor discontinuous conduct mode, will lead to switching tube M1 start-up time not by
Control, leads to the EMI degradation of system, it is therefore necessary to solve the problems, such as brought by existing constant-current control circuit.
Summary of the invention
The present invention provides a kind of constant-current control circuits, method, and using the constant-current control circuit or method
Constant-current control device.
A kind of constant-current control circuit according to an embodiment of the invention has a load, further includes an energy storage inductor, have
First end and second end, wherein first end and power input voltage electric coupling；One power switch, have input terminal, output end and
Control terminal, wherein input terminal and the energy storage inductor second end electric coupling；One detection resistance, has a first end and a second end,
Middle first end and the power switch output end electric coupling, second end and ground electric coupling, the detection resistance detection are flowed through described
The electric current of power switch generates a voltage detection signal；One critical constant-current control module has first input end, the second input
End and output end, wherein output end and the power switch control terminal electric coupling；One demagnetization time detection module, and it is described critical
Constant-current control module first input end electric coupling, detects the time point that the energy storage inductor demagnetization terminates, and one demagnetization of output terminates
Signal；One reference voltage modulation module has first input end, the second input terminal and output end, wherein first input end thermocouple
The first reference voltage is connect, power switch described in the second input terminal electric coupling controls end signal, and output end output is controlled signal
Second reference voltage of modulation；One current peak control module has first input end, the second input terminal and output end, wherein
First input end and the reference voltage modulation module output end electric coupling receive second reference voltage, the second input terminal
With the detection resistance first end electric coupling, the voltage detection signal, output end and the critical constant-current control module are received
Second input terminal electric coupling, output end export a current peak end signal；The critical constant-current control module is based on described move back
Testing result and the current peak control module pair of the magnetic time detection module to energy storage inductor demagnetization end time point
The testing result of the energy storage inductor current peak controls the energy storage inductor work in critical conduction mode, in the power
When switch conduction, allow the energy transfer of power input voltage to the energy storage inductor, when the power switch disconnects, so that institute
State energy storage inductor storage energy transfer to load.
A kind of constant-current control circuit according to an embodiment of the invention, the reference voltage modulation module, comprising: first opens
It closes, there is input terminal, output end and control terminal, wherein input terminal and the second reference voltage electric coupling, control terminal is anti-with one
Phase device output end electric coupling, the inverter input and the power switch control end signal electric coupling；Second switch has
Input terminal, output end and control terminal, wherein input terminal and the first switch output end electric coupling, control terminal are opened with the power
Close control end signal electric coupling, output end and ground electric coupling；One error amplifier, have first input end, the second input terminal and
Output end, wherein first input end and the first reference voltage electric coupling, the first end and one of the second input terminal and a resistance
The input of the output end and the second switch of the first end electric coupling of capacitor, the second end of the resistance and the first switch
Hold electric coupling, the output end electric coupling of the second end of the capacitor and the error amplifier.
A kind of constant-current control circuit according to an embodiment of the invention, the reference voltage modulation module, further includes: a pincers
Position field-effect tube, has input terminal, output end and control terminal, wherein the output end thermocouple of input terminal and the error amplifier
It connects, output end and ground electric coupling, control terminal and third reference voltage electric coupling；Or a clamper triode, there is emitter, current collection
Pole and base stage, wherein the output end electric coupling of emitter and the error amplifier, collector and ground electric coupling, base stage and third
Reference voltage electric coupling；The effect of the clamper field-effect tube or clamper triode is to allow second reference voltage by third
The control of reference voltage.
A kind of constant-current control circuit according to an embodiment of the invention, the current peak control module, comprising: one compares
Device has first input end, the second input terminal and output end, wherein first input end and current sense resistor first end electricity
Coupling, receives the voltage detection signal, the second input terminal and the second reference voltage electric coupling, and output end exports an electric current
Peak value end signal.
A kind of constant-current control circuit according to an embodiment of the invention, the power switch are NMOS tube, the NMOS tube
Grid and the critical constant-current control module output end electric coupling, source electrode and the sampling resistor first end electric coupling, leakage
Pole and the energy storage inductor second end electric coupling；Or the power switch be NPN triode, the base stage of the NPN triode with
The output end electric coupling of the critical constant-current control module, emitter and the sampling resistor first end electric coupling, collector with
The energy storage inductor second end electric coupling.
A kind of constant-current control circuit according to an embodiment of the invention, the constant-current control circuit further include: an afterflow two
Pole pipe has anode and cathode, Anodic and the energy storage inductor second end and the power switch input terminal electric coupling, yin
Pole and output capacitance first end and load first end electric coupling, the output capacitance second end and the load second end with it is described
Energy storage inductor first end electric coupling.
A kind of constant-current control circuit according to an embodiment of the invention, the energy storage inductor of the constant-current control circuit are a change
The main winding of depressor, the transformer secondary output winding have a first end and a second end, wherein first end and a freewheeling diode
Anode electric coupling, the freewheeling diode cathode and output capacitance first end and load first end electric coupling, the transformer
Grade winding second end and the output capacitance second end and the load second end electric coupling.
A kind of constant current control method according to an embodiment of the invention, comprising: generate a pulse width modulating signal；Use arteries and veins
It rushes bandwidth modulation signals and modulates the first reference voltage, export the second reference voltage；With the second reference voltage control inductive current
Peak value opens next cycle when dropping to zero using the control mode control inductive current of critical current mode conducting, with reality
Now load current constant control.
A kind of constant-current control device according to an embodiment of the invention, include any constant-current control circuit or
Using the constant current control method.
Constant-current control circuit proposed by the invention makes constant-current control circuit real by the modulation to reference voltage
While existing current constant control, energy storage inductor also operates at critical conduction mode, can well solve existing constant-current control circuit
Involved in complicated algorithm and energy storage inductor can only operate in the problem of discontinuous mode is just able to achieve current constant control, save
Cost improves the Performance And Reliability of system.
Detailed description of the invention
Figure 1A show existing constant-current control circuit schematic diagram；
Figure 1B show existing constant-current control circuit exemplary operation waveform diagram；
Fig. 2A show the constant-current control circuit schematic diagram of one embodiment of the invention；
Fig. 2 B show the reference voltage modulation module schematic diagram of one embodiment of the invention；
Fig. 2 C show the current peak control module schematic diagram of one embodiment of the invention；
Fig. 2 D show the exemplary operation waveform diagram of one embodiment of the invention；
Fig. 3 A show the constant-current control circuit schematic diagram of another embodiment of the present invention；
Fig. 3 B show the exemplary operation waveform diagram of another embodiment of the present invention；
Fig. 4 is the constant current control method flow chart according to one embodiment of the invention.
Specific embodiment
Specific embodiments of the present invention are described more fully below, it should be noted that the embodiments described herein is served only for illustrating
Illustrate, is not intended to restrict the invention.In the following description, in order to provide a thorough understanding of the present invention, a large amount of spies are elaborated
Determine details.It will be apparent, however, to one skilled in the art that: this hair need not be carried out using these specific details
It is bright.In other instances, in order to avoid obscuring the present invention, well known circuit, material or method are not specifically described.
Throughout the specification, meaning is referred to " one embodiment ", " embodiment ", " example " or " example "
: a particular feature, structure, or characteristic described in conjunction with this embodiment or example is comprised at least one embodiment of the invention.
Therefore, the phrase " in one embodiment ", " in embodiment ", " example " occurred in each place of the whole instruction
Or " example " is not necessarily all referring to the same embodiment or example.Furthermore, it is possible in any suitable combination and/or sub-portfolio will be specific
Feature, structure or characteristic combine in one or more embodiment or examples.In addition, those of ordinary skill in the art should manage
Solution, attached drawing is provided to the purpose of explanation provided herein, and attached drawing is not necessarily drawn to scale.It should be appreciated that working as
When claiming element " being connected to " or " being couple to " another element, it, which can be, is directly connected or coupled to another element or can deposit
In intermediary element.On the contrary, intermediary element is not present when claiming element " being directly connected to " or " being directly coupled to " another element.
Identical appended drawing reference indicates identical element.Term "and/or" used herein includes the item that one or more correlations are listed
Any and all combinations of purpose.
Fig. 2A show a kind of constant-current control circuit 200 according to an embodiment of the invention, has a load 204, also wraps
An energy storage inductor 201 is included, is had a first end and a second end, wherein first end and power input voltage VIN electric coupling；One power is opened
205 are closed, there is input terminal, output end and control terminal, wherein input terminal and the 201 second end electric coupling of energy storage inductor；One inspection
Measuring resistance 206, has a first end and a second end, wherein first end and the 205 output end electric coupling of power switch, second end with
Ground electric coupling, the detection resistance 206 detect the electric current for flowing through the power switch 205, generate a voltage detection signal Vcs；
One critical constant-current control module 240 has first input end, the second input terminal and output end, wherein output end and the power
205 control terminal electric coupling of switch；One demagnetization time detection module 220, with critical 240 first input end of constant-current control module
Electric coupling detects the time point that the demagnetization of energy storage inductor 201 terminates, one demagnetization end signal ZXC of output；One reference voltage tune
Molding block 210 has first input end, the second input terminal and output end, wherein the first reference voltage of first input end electric coupling
Vref1, power switch 205 described in the second input terminal electric coupling control end signal PWM, and output end output is controlled signal PWM
Second reference voltage Vref2 of modulation；One current peak control module 230 has first input end, the second input terminal and output
End, wherein first input end and the 210 output end electric coupling of reference voltage modulation module, receive second reference voltage
Vref2, the second input terminal and the 206 first end electric coupling of detection resistance, receive the voltage detection signal Vcs, output end
With the critical 240 second input terminal electric coupling of constant-current control module, output end exports a current peak end signal OFF；Institute
It states critical constant-current control module 240 and is based on the demagnetization time detection module 220 to the energy storage inductor 201 demagnetization end time
The ZXC signal that the detection of point generates, and the current peak control module 230 is occupy to 201 current peak of energy storage inductor
The OFF signal that the detection of Ipk generates controls the work of energy storage inductor 201 in critical conduction mode, in the power switch
When 205 conducting, allows the energy transfer of power input voltage VIN to the energy storage inductor 201, disconnected in the power switch 205
When so that the energy storage inductor 201 store energy transfer to load 204.The allusion quotation of one embodiment of the invention in conjunction with shown in Fig. 2 D
Type working waveform figure, after control signal PWM becomes high level, power switch 205 is connected, and DRAIN voltage becomes low level,
Input voltage VIN charges to energy storage inductor 201 by power switch 205 and detection resistance 206, and inductive current IL is linearly increased,
Detection voltage Vcs is also linearly increased, and is flowed to the electric current Iout=0 in load 204 by freewheeling diode 202 at this time, is worked as detection
When voltage Vcs reaches the second reference voltage Vref2 modulated, the current peak that current peak control module 230 exports terminates
Signal OFF becomes high level, and the critical output of constant-current control module 240 control signal PWM disconnects power switch 205, DRAIN electricity
Buckling flows to load by freewheeling diode 202 at high level, the inductive current IL=Iout in this stage, and inductive current IL is linear
Reduce, when IL linear reduction arrive zero current when, DRAIN voltage start generate LC resonance, demagnetize time detection module 220 pass through inspection
The LC resonance state for surveying DRAIN voltage, after detecting that 201 electric current IL of inductance becomes zero, the inductance demagnetization end signal of output
ZXC becomes high level, and power switch 205 is connected again, continues to follow by the critical output of constant-current control module 240 control signal PWM
Ring next cycle.Therefore when the work of constant-current control circuit 200 is in critical conduction mode, load average exports electric current
Iout=0.5*Ipk* (Tdemg/T)=0.5* (Vref2/Rcs) * (Tdemg/T) --- -- (1).
Fig. 2 B show reference voltage modulation module 210 according to an embodiment of the invention, comprising: first switch 212, tool
There are input terminal, output end and control terminal, wherein input terminal and the second reference voltage Vref2 electric coupling, control terminal is anti-with one
211 output end electric coupling of phase device, 211 input terminal of phase inverter and the power switch control end signal PWM electric coupling；Second
Switch 213 has input terminal, output end and control terminal, wherein input terminal and the 212 output end electric coupling of first switch, control
End processed and the power switch control end signal PWM electric coupling, output end and ground electric coupling；One error amplifier 216 has the
One input terminal, the second input terminal and output end, wherein first input end and the first reference voltage Vref1 electric coupling, second
The first end electric coupling of the first end and a capacitor 215 of input terminal and a resistance 214, the second end of the resistance 214 with it is described
The input terminal electric coupling of the output end of first switch 212 and the second switch 213, the second end of the capacitor 215 with it is described
The output end electric coupling of error amplifier 216.
In an embodiment of the present invention, as shown in Figure 2 B, when controlling signal PWM is low level, first switch 212 is led
Logical, second switch 213 disconnects, and the second reference voltage Vref2*Tdmeg is transmitted to the second end of resistance 214；As control signal PWM
When for high level, first switch 212 is disconnected, and second switch 213 is connected, and no-voltage is transmitted to the second end of resistance 214.Due to electricity
Resistance 214, capacitor 215 and error amplifier 216 constitute single order RC low-pass filter, error amplifier in-phase end input voltage etc.
In reverse side input voltage, under the limit of critical conduction mode,
Vref1* (Ton+Tdemg)=Vref1*T=Vref2*Tdemg----- (2)
Vref2=Vref1*T/Tdemg----- (3)
In conjunction with formula (1) and formula (3)
Iout=0.5* (Vref1/Rcs) --- -- (4)
From formula (4) as can be seen that under critical conduction mode, using the reference voltage for being controlled signal PWM modulation
The peak value for controlling inductive current, may be implemented current constant control.
Reference voltage modulation module according to an embodiment of the invention, as shown in Figure 2 B, further includes: a clamper field-effect tube
217, there is input terminal, output end and control terminal, wherein the output end electric coupling of input terminal and the error amplifier 216, defeated
Outlet and ground electric coupling, control terminal and third reference voltage Vref3 electric coupling, therefore Vref2 voltage can be limited to by maximum
Vref3+Vth, wherein Vth voltage is the conducting cut-in voltage of field-effect tube 217；Or a clamper triode 217, there is transmitting
Pole, collector and base stage, wherein the output end electric coupling of emitter and the error amplifier 216, collector and ground electric coupling,
Base stage and third reference voltage Vref3 electric coupling, therefore Vref2 voltage can be limited to Vref3+Vbe by maximum, wherein Vbe is electric
Pressure is the conducting cut-in voltage of triode 217；The effect of the clamper field-effect tube 217 or clamper triode 217 be allow it is described
Second reference voltage Vref2 is controlled by the clamper of third reference voltage Vref3, and the second reference voltage Vref2 is allowed to believe in control
Number PWM duty cycle will not be out of control when larger.
Current peak control module according to an embodiment of the invention includes: a comparator 231, has as shown in Figure 2 C
First input end, the second input terminal and output end, wherein first input end and the 206 first end thermocouple of current sense resistor
It connects, receives the voltage detection signal Vcs, the second input terminal and the second reference voltage Vref2 electric coupling, output end output
One current peak end signal OFF.When the voltage detection signal Vcs is higher than the second reference voltage Vref2, comparator
231 output high level, conversely, output low level.
Power switch 205 according to an embodiment of the invention is NMOS tube, the grid of the NMOS tube and the critical perseverance
The output end electric coupling of flow control module 240, source electrode and the 206 first end electric coupling of sampling resistor, drain electrode and energy storage inductor
201 second end electric couplings；Or the power switch 205 is NPN triode, the base stage of the NPN triode and the critical perseverance
The output end electric coupling of flow control module 240, emitter and the 206 first end electric coupling of sampling resistor, collector and energy storage
201 second end electric coupling of inductance.
A kind of constant-current control circuit according to an embodiment of the invention, as shown in Figure 2 A, the constant-current control circuit 200 is also
Include: a freewheeling diode 202, there is anode and cathode, Anodic and 201 second end of energy storage inductor and the power
205 input terminal electric coupling of switch, cathode and 203 first end of output capacitance and 204 first end electric couplings of load, the output capacitance
203 second ends and 204 second ends of the load and the 201 first end electric coupling of energy storage inductor.The constant-current control circuit 200
A kind of step-up/step-down circuit structure is constituted, typical working waveform figure is as shown in Figure 2 D, and the step-up/step-down circuit structure is produced
Raw average output current is Iout=0.5*Vref1/Rcs.
A kind of constant-current control circuit according to an embodiment of the invention, as shown in Figure 3A, the constant-current control circuit 300
Energy storage inductor 301 is the main winding of a transformer T1, and the transformer T1 secondary windings has a first end and a second end, wherein
First end and 202 anode electric coupling of a freewheeling diode, 202 cathode of freewheeling diode and 203 first end of output capacitance and
Load 204 first end electric couplings, the transformer T1 secondary windings second end and 203 second end of output capacitance and described negative
Carry 204 second end electric couplings.The constant-current control circuit 300 constitutes a kind of flyback circuit structure, typical work wave
As shown in Figure 3B, average output current caused by the flyback circuit structure is Iout=0.5*Nps*Vref1/Rcs to figure,
Middle Nps is the turn ratio of transformer T1.The constant current principle of the circuit of reversed excitation 300 and the constant current of the step-up/step-down circuit 200 are former
It manages similar, is just not repeated to illustrate.
Fig. 4 is according to the constant current method flow diagram of one embodiment of the invention, including step 401~403
Step 401, a pulse width modulating signal is generated；
Step 402, the first reference voltage is modulated with pulse width modulating signal, exports the second reference voltage；
Step 403, with the peak value of the second reference voltage control inductive current, the controlling party be connected using critical current mode
Formula control inductive current opens next cycle when dropping to zero, to realize load current constant control.
A kind of constant-current control device according to an embodiment of the invention includes any constant-current control circuit as mentioned
Or using the constant current control method.
Although exemplary embodiment describes the present invention with reference to several, it is to be understood that, term used is explanation and shows
Example property, term and not restrictive.The spirit or reality that can be embodied in a variety of forms due to the present invention without departing from invention
Matter, it should therefore be appreciated that above-described embodiment is not limited to any of the foregoing details, and the spirit defined by appended claims
It all should be accompanying power with the whole change and modification widely explained, therefore fallen into claim or its equivalent scope in range
Benefit requires to be covered.For those skilled in the art, without departing from the principle of the present invention, can also do
Several improvements and modifications out, these modifications and embellishments should also be considered as the scope of protection of the present invention.
Claims (9)
1. a kind of constant-current control circuit has a load characterized by comprising
One energy storage inductor, has a first end and a second end, wherein first end and power input voltage electric coupling；
One power switch has input terminal, output end and control terminal, wherein input terminal and the energy storage inductor second end thermocouple
It connects；
One detection resistance, has a first end and a second end, wherein first end and the power switch output end electric coupling, second end
With ground electric coupling, the detection resistance detection flows through the electric current of the power switch, generates a voltage detection signal；
One critical constant-current control module has first input end, the second input terminal and output end, wherein output end and the power
Switch control terminal electric coupling；
One demagnetization time detection module detects the energy storage electricity with the critical constant-current control module first input end electric coupling
The time point that sense demagnetization terminates, one demagnetization end signal of output；
One reference voltage modulation module has first input end, the second input terminal and output end, wherein first input end electric coupling
First reference voltage, power switch described in the second input terminal electric coupling control end signal, and output end output is controlled signal tune
Second reference voltage of system；
One current peak control module, have first input end, the second input terminal and output end, wherein first input end with it is described
Reference voltage modulation module output end electric coupling, receives second reference voltage, the second input terminal and the detection resistance the
One end electric coupling receives the voltage detection signal, output end and critical the second input terminal of constant-current control module electric coupling,
Output end exports a current peak end signal；
The critical constant-current control module is based on the demagnetization time detection module to energy storage inductor demagnetization end time point
Testing result and the current peak control module to the testing result of the energy storage inductor current peak, control the energy storage
Inductance work is in critical conduction mode, in power switch conducting, the energy transfer of power input voltage to the energy storage
Inductance, when the power switch disconnects, the energy transfer of energy storage inductor storage is to loading.
2. a kind of constant-current control circuit as described in claim 1, which is characterized in that the reference voltage modulation module, comprising:
First switch has input terminal, output end and control terminal, wherein input terminal and the second reference voltage electric coupling, control
End processed and an inverter output electric coupling, the inverter input and the power switch control end signal electric coupling；
Second switch has input terminal, output end and control terminal, wherein input terminal and the first switch output end electric coupling,
Control terminal and the power switch control end signal electric coupling, output end and ground electric coupling；
One error amplifier has first input end, the second input terminal and output end, wherein first input end and first base
The first end of quasi- voltage electric coupling, the second input terminal and a resistance and the first end electric coupling of a capacitor, the second of the resistance
End and the output end of the first switch and the input terminal electric coupling of the second switch, the second end of the capacitor and the mistake
The output end electric coupling of poor amplifier.
3. a kind of constant-current control circuit as claimed in claim 2, which is characterized in that the reference voltage modulation module also wraps
It includes:
One clamper field-effect tube has input terminal, output end and control terminal, the wherein output of input terminal and the error amplifier
Hold electric coupling, output end and ground electric coupling, control terminal and third reference voltage electric coupling；Or
One clamper triode has emitter, collector and base stage, wherein the output end of emitter and error amplifier electricity
Coupling, collector and ground electric coupling, base stage and third reference voltage electric coupling；The clamper field-effect tube or clamper triode
Effect is to allow control of second reference voltage by third reference voltage.
4. a kind of constant-current control circuit as described in claim 1, which is characterized in that the current peak control module, comprising:
One comparator has first input end, the second input terminal and output end, wherein first input end and current detecting electricity
First end electric coupling is hindered, the voltage detection signal, the second input terminal and the second reference voltage electric coupling, output end are received
Export a current peak end signal.
5. a kind of constant-current control circuit as described in claim 1, which is characterized in that the power switch is NMOS tube, described
The output end electric coupling of the grid of NMOS tube and the critical constant-current control module, source electrode and the sampling resistor first end thermocouple
It connects, drain electrode and the energy storage inductor second end electric coupling；Or the power switch is NPN triode, the base of the NPN triode
The output end electric coupling of pole and the critical constant-current control module, emitter and the sampling resistor first end electric coupling, current collection
Pole and the energy storage inductor second end electric coupling.
6. a kind of constant-current control circuit as described in claim 1, which is characterized in that the constant-current control circuit further include:
One freewheeling diode has anode and cathode, and Anodic and the energy storage inductor second end and the power switch are defeated
Enter and hold electric coupling, cathode and output capacitance first end and load first end electric coupling and described are born the output capacitance second end
Carry second end and the energy storage inductor first end electric coupling.
7. a kind of constant-current control circuit as described in claim 1, which is characterized in that the energy storage inductor of the constant-current control circuit
For the main winding of a transformer, the transformer secondary output winding is had a first end and a second end, wherein first end and an afterflow
Diode anode electric coupling, the freewheeling diode cathode and output capacitance first end and load first end electric coupling, the change
Depressor secondary windings second end and the output capacitance second end and the load second end electric coupling.
8. a kind of constant current control method, comprising:
Generate a pulse width modulating signal；
The first reference voltage is modulated with pulse width modulating signal, exports the second reference voltage；
It is electric using the control mode control inductance of critical current mode conducting with the peak value of the second reference voltage control inductive current
It flows down and opens next cycle when dropping to zero, to realize load current constant control.
9. a kind of constant-current control device, which is characterized in that including just like any constant-current control circuit of claim 1 to 7
Or use constant current control method as claimed in claim 8.
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