CN106982491A - Buck-boost type constant-current drive circuit and constant current driving method - Google Patents
Buck-boost type constant-current drive circuit and constant current driving method Download PDFInfo
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- CN106982491A CN106982491A CN201710229603.2A CN201710229603A CN106982491A CN 106982491 A CN106982491 A CN 106982491A CN 201710229603 A CN201710229603 A CN 201710229603A CN 106982491 A CN106982491 A CN 106982491A
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- 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]
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Abstract
The present invention relates to a kind of buck-boost type constant-current drive circuit and constant current driving method, the circuit includes constant-flow driver and buck main structure；Also include the sampling feedback resistance being connected between the power tube, power inductance and fly-wheel diode, one end of the sampling feedback resistance is connected with power inductance, the source electrode connection of the other end and power tube, and the sampling pin of one end for being connected with power tube of sampling feedback resistance and constant-flow driver is connected, the sampling feedback resistance is used to sample to the size of current in the back-end circuit of power tube, and then maintains the rear end constant output current of power tube；The constant-flow driver is used to obtain sampled signal by pin of sampling, and by driving pin output pulse width modulated signal to control the break-make of power tube, and then adjust the component in the constant current accuracy and protection circuit of power tube output current.
Description
Technical field
The present invention relates to constant-current supply technical field, more particularly to a kind of buck-boost type constant-flow driver and constant current driving
Method.
Background technology
With gradually stepping up for professional standard, increasing countries and regions propose power factor for LED power
Requirement, that is, require that input current needs to follow input voltage change to reduce the harmonic pollution to power network.Due to tradition lifting
The features such as die mould circuit has efficiency high, exportable high current and small quiescent current, so buck-boost type circuit is gradually employed
To among LED constant-current driver.In addition, with the increase of production cost, how to provide a kind of safety for taking into account cost and performance
Reliable scheme turns into study hotspot.
In implementation, buck-boost type LED constant current controller has two kinds of traditional solutions, the first traditional solution party
Case, so can be with convection current as shown in figure 1, Constant flow sample feedback resistance Rcs is placed between sustained diode and power inductance L
Whole electric currents through LED carry out sampling feedback, then are aided with high-precision closed loop operational amplifier and outside integrating capacitor C1
Free from error high precision constant current output control on realization theory.But, when input voltage is uprushed and ON time fix can draw
Rise inductive current increase suddenly, and sampling resistor can not gather power tube Q1 conducting during electric current so electricity occurs in the case
Sense saturation even power tube Q1 overcurrent burns risk.
Second of traditional solution by Constant flow sample feedback resistance Rcs as shown in Fig. 2 be placed in sustained diode and work(
Between rate pipe Q1, as traditional primary-side-control technology.Can so maximum value protection be carried out to the electric current for flowing through power tube Q1,
It is not in the aircraft bombing risk caused by input voltage is uprushed.But, flowed through because sampling feedback resistance can not be gathered directly
LED electric current, so chip 2 needs the feedback control loop design of complexity, that is, needs by being adopted to the peak point current for flowing through Q1
Thus the information for calculating output current of sample and inductive current time of afterflow brought most so as to indirect control output current
Big problem is that the precision of output current can change with input voltage, the change of inductance value error and actuating speed.
In summary, the first traditional solution exist sampling feedback resistance can not directly sample conducting during electric current
, there is electric current and increase suddenly and cause the inductance saturation risk that even power tube Q1 overcurrent is burnt in information.Second of traditional solution party
Case, constant current output is changed and changed by input voltage, inductance value error and actuating speed, causes constant current accuracy poor.
The content of the invention
Based on this, it is necessary to for present in traditional buck-boost type constant-current control circuit because sampling feedback resistance can not be straight
Current information during connecing sampling conducting causes power tube to burn, and can be real there is provided one kind the problem of constant current output low precision
When monitoring power tube conducting electric current and improve the buck-boost type constant-current drive circuit and constant current driving method of constant current output precision.
A kind of buck-boost type constant-current drive circuit, including：
Constant-flow driver, provided with driving pin and by driving pin output pulse width modulated signal, drawing provided with sampling
Pin simultaneously passes through pin input sample signal of sampling；
Buck main structure, includes power tube, power inductance and the fly-wheel diode of interconnection；Wherein described power
The driving pin of the grid of pipe and constant-flow driver is connected, and the constant-flow driver is according to the pulse width modulating signal pair of input
Power tube carries out break-make control；
Characterized in that, also including the sampling feedback being connected between the power tube, power inductance and fly-wheel diode
Resistance, one end of the sampling feedback resistance is connected with power inductance, the source electrode connection of the other end and power tube, and sampling feedback
One end and the sampling pin of constant-flow driver that resistance is connected with power tube are connected, and the sampling feedback resistance is used for power tube
Back-end circuit in size of current sampled, and then maintain power tube rear end constant output current；The power inductance
It is connected with source electrode one end after sampling feedback resistant series again with power tube, the negative electrode of the fly-wheel diode and the source of power tube
Pole is directly connected to；
The constant-flow driver is used to obtain sampled signal by pin of sampling, and by driving pin output pulse width
Modulated signal controls the break-make of power tube, and then adjusts first device in the constant current accuracy and protection circuit of power tube output current
Part.
In one of the embodiments, the constant-flow driver also includes：
Compensation pin, for input offset signal；
Pin is detected, for inputting detection signal；
Operational amplifier, for the sampled signal for pin input of sampling to be carried out into operation amplifier with constant current output benchmark, is obtained
To error result, and export the sampled signal after amplification；
First comparator, for the sampled signal for pin input of sampling to be compared with overcurrent protection benchmark, and in institute
The first overcurrent protection signal is exported when stating sampled signal more than the overcurrent protection benchmark；
Second comparator, for the output result of operational amplifier and triangular signal to be compared, and puts in computing
The output result of big device exports the second overcurrent protection signal when exceeding the triangular signal；
Drive module, receives the first overcurrent protection signal and the first overcurrent protection signal, and by driving pin defeated
Go out pulse width modulating signal；
The inverting input of the operational amplifier be connected with sampling pin, and in the anti-of pin and operational amplifier of sampling
Feedback switch is provided between phase input, the conducting sequential of the feedback switch is opposite with the conducting sequential of power tube.
In one of the embodiments, in addition to for carrying out the integrating capacitor of error compensation, the one of the integrating capacitor
End is connected with the compensation pin of constant-flow driver, and the other end is connected between sampling feedback resistance and power inductance.
In one of the embodiments, in addition to for demagnetization the first resistor and second resistance with overvoltage detection are detected,
The first resistor is connected with second resistance, and the first resistor and second resistance and the sampling feedback resistance and work(connected of series connection
Rate inductance in parallel, the detection pin is connected between first resistor and second resistance.
In one of the embodiments, the in-phase input end input constant current output benchmark of the operational amplifier, anti-phase defeated
Enter to hold input sample signal, the output end of operational amplifier is connected with the reverse input end of the second comparator.
In one of the embodiments, the in-phase input end of the first comparator is connected with sampling pin, input sample
Signal；Inverting input inputs overcurrent protection benchmark；Output end is connected with drive module.
In one of the embodiments, the in-phase input end input triangular signal of second comparator；Reversely input
End is connected with the output end of compensation pin and operational amplifier, and input carries out the sampled signal after error compensation；Output end is with driving
Dynamic model block is connected.
In one of the embodiments, in addition to detection module, the detection module includes demagnetization detection unit and overvoltage
Detection unit, the input of detection module is connected with detection pin, and by detecting pin input detection signal, detection signal is entered
Row demagnetization is detected and overvoltage detection, and exports demagnetization signal by demagnetization detection unit, passes through over-pressed detection unit output overvoltage
Protection signal.
In one of the embodiments, the drive module includes rest-set flip-flop and driver element, the R of the rest-set flip-flop
End and S ends are connected at least one OR circuit；
The S ends of the rest-set flip-flop are connected with the output end of the first OR circuit, the input of first OR circuit
Input the demagnetization signal of break-make clock signal and/or detection module output；
The R ends of the rest-set flip-flop are connected with the output end of the second OR circuit, the input of second OR circuit
Input the first overcurrent protection signal and/or the second overcurrent protection signal and/or overvoltage protection signal；
The Q ends of the rest-set flip-flop are connected with driver element.
A kind of constant current driving method, for making the back-end circuit of power tube export constant current, institute by driving power pipe
The method of stating includes：
Sampled signal is obtained, the sampled signal and overcurrent protection benchmark are compared and obtain the first comparative result；
The sampled signal and constant current output benchmark are subjected to operation amplifier, error result and amplified signal is obtained；
Amplified signal is compensated according to the error result, the amplified signal after being compensated；
Amplified signal after the compensation and triangular signal are compared and obtain the second comparative result；
The power tube conducting is driven according to first comparative result and the second comparative result.
Above-mentioned buck-boost type constant-current drive circuit and constant current driving method, by the way that sampling feedback resistance is arranged at into power
Between pipe, power inductance and fly-wheel diode, it be able to can both be sampled again with the output current information of sampled power pipe conduction device
Afterflow device flows through the current information of output loading；By constant-flow driver sampling pin and operational amplifier it is anti-phase defeated
Enter and feedback switch is set between holding, and the conducting sequential of the feedback switch and the conducting sequential of power tube are on the contrary, more accurately
The sampling to output current is obtained, sampling precision is improved.In summary, the embodiment of the present invention is realized turns on the phase to power tube
Between maximum current protection, reach direct output current feedback and high-precision constant current output effect.
Brief description of the drawings
Fig. 1 is the schematic diagram of the buck-boost type constant-current drive circuit of traditional scheme one；
Fig. 2 is the schematic diagram of the buck-boost type constant-current drive circuit of traditional scheme two；
Fig. 3 is the schematic diagram of the buck-boost type constant-current drive circuit of one embodiment of the invention；
Fig. 4 is the constant-flow driver module map of one embodiment of the invention；
Fig. 5 is power tube, the conducting sequential and power inductor current and amplifier of feedback switch in one embodiment of the invention
The comparison of wave shape figure of input current；
Fig. 6 is the schematic diagram of the buck-boost type constant-current drive circuit of another embodiment of the present invention；
Fig. 7 is the constant-flow driver module map of another embodiment of the present invention；
Fig. 8 is the constant current driving method flow chart of one embodiment of the invention.
Embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give presently preferred embodiments of the present invention.But, the present invention can be realized in many different forms, however it is not limited to this paper institutes
The embodiment of description.On the contrary, the purpose for providing these embodiments is to make the understanding to the disclosure more thorough
Comprehensively.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The implication that technical staff is generally understood that is identical.Term used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that the limitation present invention.Term as used herein "and/or" includes one or more correlations
Listed Items arbitrary and all combination.
A kind of buck-boost type constant-flow driver and constant current driving method presented below, for adjusting power tube output current
Component in constant current accuracy and protection circuit.
As shown in fig.3, the schematic diagram of the buck-boost type constant-current drive circuit for one embodiment of the invention, the buck
Type constant-current drive circuit includes constant-flow driver 100, buck main structure 200 and sampling feedback resistance Rcs；The constant current driving
Device 100 is provided with driving pin GATE, sampling pin CS, compensation pin COMP and detection pin FB；The buck main structure 200
Including power tube Q1, power inductance L and sustained diode；Alternatively, the power tube Q1 can be transistor or metal-oxide-semiconductor.
Further, the grid of the power tube Q1 is connected with the driving pin GATE of constant-flow driver 100, the constant current
Driver 100 carries out break-make control according to the pulse width modulating signal of input to power tube Q1；The power inductance L and sampling
It is connected again with power tube Q1 source electrode one end after feedback resistance Rcs series connection, the power inductance L is used for when power tube Q1 is turned on
The current storage that power tube Q1 is exported, and provide electric current when power tube Q1 disconnects for power tube Q1 back-end circuit；It is described
The negative electrode of sustained diode and the source electrode of power tube are connected, and the sustained diode plays afterflow effect in circuit, and protects
Component in protection circuit is not damaged by.
The sampling feedback resistance Rcs is connected between power tube Q1, power inductance L and sustained diode, the sampling
Feedback resistance Rcs one end is connected with power inductance L, and the other end is connected with power tube Q1 source electrode, and sampling feedback resistance Rcs
The one end being connected with power tube Q1 is connected with sampling pin CS；The sampling feedback resistance Rcs is used for the rear end to power tube Q1
The size of current of circuit output is sampled, and then maintains the rear end constant output current of power tube, and is realized to flowing through power
Pipe Q1 current maxima protection；The constant-flow driver 100 is used to control work(by the sampled signal for pin CS acquisitions of sampling
Rate pipe Q1 break-make, and then adjust the component in the constant current accuracy and protection circuit of power tube output current.
In one embodiment, the buck-boost type constant-current drive circuit also include integrating capacitor C1, first resistor R1 and
Second resistance R2, one end of the integrating capacitor C1 is connected with the compensation pin COMP of constant-flow driver 100, and the other end is connected to
Between sampling feedback resistance Rcs and power inductance L, the integrating capacitor C1 releasable electricity after charging passes through compensation pin
COMP gives the input offset signal of constant-flow driver 100.
The first resistor R1 connects with second resistance R2, and series connection first resistor R1 and second resistance R2 with connecting
Sampling feedback resistance Rcs and power inductance L are in parallel, the detection pin FB be connected to first resistor R1 and second resistance R2 it
Between, the first resistor R1 and second resistance R2 are used for the detection for realizing demagnetization signal, and the detection pin FB passes through the first electricity
Hinder R1 and second resistance R2 size of current detection power inductance L whether demagnetization；Meanwhile, because first resistor R1 and then the second electricity
There is partial pressure relation in resistance R2, the detection pin FB can detect this by first resistor R1 and second resistance R2 voltage relationship
When circuit it is whether over-pressed.
As shown in fig.4, in one embodiment, the constant-flow driver 100 also includes first comparator 110, computing
Amplifier 120, the second comparator 130, detection module 140 and drive module 150, the detection module 140 are detected including demagnetization
Unit 141 and over-pressed detection unit 142, the drive module 150 include rest-set flip-flop 151 and driver element 152, the computing
Amplifier 120 is used to the sampled signal for pin CS inputs of sampling carrying out computing with constant current output benchmark, obtains error result simultaneously
Output；The first comparator 110 is used to the sampled signal for pin CS inputs of sampling being compared with overcurrent protection benchmark, and
The first overcurrent protection signal is exported when the sampled signal exceedes the overcurrent protection benchmark；Second comparator 130 is used
It is compared, and exceedes in the output result of operational amplifier in by the output result of operational amplifier 120 and triangular signal
The second overcurrent protection signal is exported during the triangular signal；The detection module 140 is used for the back-end circuit to power tube Q1
Carry out demagnetization detection and overvoltage detection, and output over-voltage protection signal and demagnetization signal；The drive module 150 is used to receive institute
The first overcurrent protection signal, the second overcurrent protection signal, overvoltage protection signal and demagnetization signal are stated, and by driving pin to export
Pulse width modulating signal.
Further, the in-phase input end of the first comparator 110 is connected with sampling pin CS, input sample signal；
The inverting input input overcurrent protection benchmark of first comparator 110；The output end of first comparator 110 and drive module 150
Connection；Output current during power tube Q1 conductings is obtained by the pin CS that samples, that is, power inductance L electric current is flowed through, by institute
Output current is stated to be compared with overcurrent protection benchmark in real time, when the output current exceedes the overcurrent protection benchmark, the
One comparator 110 sends the first overcurrent protection signal to drive module 150, and drive module 150 receives first overcurrent protection
Power tube Q1 is driven to disconnect after signal, to protect power tube Q1 back-end circuit safely and reliably to work；It is described to flow through power electricity
The waveform relationship for feeling L electric current and overcurrent protection benchmark is as shown in Figure 5.
Further, the reverse input end of the operational amplifier 120 is connected with sampling pin CS, the operational amplifier
120 inverting input input sample signal, in-phase input end input constant current output benchmark, and put in sampling pin CS with computing
Feedback switch S1, the feedback switch S1 are provided between the inverting input of big device 120 for controlling operational amplifier 120
Anti-phase input, when feedback switch S1 disconnects, the inverting input no signal input of operational amplifier 120.As shown in fig.5,
The conducting sequential of the feedback switch S1 is with the driving pin GATE drive control sequential exported on the contrary, working as drive module 150
When driving power pipe Q1 is turned on, the feedback switch S1 disconnects；It is described anti-when the driving power pipe Q1 of drive module 150 disconnects
Feedback switch S1 conductings；Due to when power tube Q1 disconnects, electric current is provided for power tube Q1 back-end circuit by power inductance L, this
When feedback switch S1 conducting so that the output information that the input of operational amplifier 120 can be complete sampled power inductance L, and
The power inductance L of sampling output current and constant current output benchmark are subjected to operation amplifier, error result is obtained, and export
Sampled signal after amplification, to reach current constant control purpose.The waveform of the inverting input input current of operational amplifier 120 is such as
Shown in Fig. 5.
Further, the output end of the operational amplifier 120 is connected with the reverse input end of the second comparator 130；Institute
State the in-phase input end input triangular signal of the second comparator 130；The reverse input end of second comparator 130 respectively with compensation
The output end connection of pin COMP and operational amplifier 120, input carries out the sampled signal after error compensation；Second comparator
130 output end is connected with drive module 150；The mistake that the compensation pin COMP is calculated according to the operational amplifier 120
Poor result obtains error compensation, and from integrating capacitor C1 to compensation pin COMP input offset signals, operational amplifier 120 is exported
Amplification after sampled signal compensate, the sampled signal after compensation is input to the inverting input of the second comparator 130,
Sampled signal after the compensation and triangular signal are compared by two comparators 130, the sampled signal after compensation
During more than the triangular signal, the second comparator 130 sends the second overcurrent protection signal, drive module to drive module 150
150 drive power tube Q1 to disconnect after the second overcurrent protection signal is received, to protect power tube Q1 back-end circuit to pacify
Reliably work entirely.
The input of the demagnetization detection unit 141 and over-pressed detection unit 142 is connected with detection pin FB respectively；Demagnetization
The output end of detection unit 141 and over-pressed detection unit 142 is connected with drive module 150 respectively；By detecting that pin FB is inputted
Signal is detected, demagnetization detection and overvoltage detection are carried out to the detection signal, the demagnetization detection unit 141 is detecting demagnetization
Demagnetization signal is exported after signal, drive module 150 drives power tube Q1 to turn on after the demagnetization signal is received；The overvoltage
Detection unit 142 detect circuit it is over-pressed when output over-voltage protection signal, and by fault protection logic to drive module 150
Error protection request is sent, the driving power tube Q1 after the error protection request is received of drive module 150 disconnects.By disappearing
Magnetic testi unit 141 and over-pressed detection unit 142 carry out demagnetization detection and overvoltage detection to power tube Q1 back-end circuit, can
Component steady operation in more effectively protection circuit, maintenance circuitry.
The R ends and S ends of the rest-set flip-flop 151 are connected at least one OR circuit, the rest-set flip-flop 151
S ends are connected with the output end of the first OR circuit (figure is not marked), the input input break-make clock letter of first OR circuit
Number and/or demagnetization detection unit 141 export demagnetization signal；The R ends of the rest-set flip-flop and the second OR circuit (figure is not marked)
Output end connection, second OR circuit input input first comparator 110 export the first overcurrent protection signal
And/or the second overvoltage protection letter that exports of the second overcurrent protection signal that exports of comparator 130 and/or over-pressed detection unit 142
Number；The Q ends of the rest-set flip-flop 151 are connected with driver element 152；According to the trigger theory of rest-set flip-flop 151, when the input of S ends
Shut-off clock signal and/or during effective demagnetization signal, the Q ends of rest-set flip-flop 151 put 1, and pass through driver element 152 and drive work(
Rate pipe Q1 is turned on；When the first overcurrent protection signal and/or the second overcurrent protection signal and/or overvoltage protection signal of the input of R ends
When effectively, the Q ends of rest-set flip-flop 151 are set to 0, and are disconnected by the driving power pipe Q1 of driver element 152.
Above-mentioned lifting type constant-current drive circuit, by the way that sampling feedback resistance is arranged at into power tube, power inductance and afterflow
Between diode, realizing both can be with the output current information of sampled power pipe conduction device, and can sample afterflow device stream again
Current information through output loading；By being set between the sampling pin of constant-flow driver and the inverting input of operational amplifier
Feedback switch is put, and the conducting sequential of the feedback switch and the conducting sequential of power tube are on the contrary, more accurately obtain to output
The sampling of electric current, improves sampling precision.In summary, electricity maximum during realizing to power tube conducting of the embodiment of the present invention
Stream protection, reaches direct output current feedback and high-precision constant current output effect.By sampling, pin obtains sampled signal,
And by driving pin output pulse width modulated signal to control the break-make of power tube, improve the constant current output precision of circuit simultaneously
Protection circuit, makes the component steady operation in circuit.
In other embodiments, should as shown in fig.6, being another lifting type constant-current drive circuit of the embodiment of the present invention
Lifting type constant-current drive circuit, which is worked in, to be determined under frequency pattern, then reduces and detected for demagnetization and the over-pressed electricity detected in circuit
The operation principle of other devices in resistance, circuit is identical with circuit shown in Fig. 3, and refers to shown in Fig. 7, is operated in and determines frequency pattern
Under constant-flow driver 100 ' reduce detection pin, and reduce detection module constant-flow driver 100 ' is internal；Touched in RS
Frequency clock signal is determined in the S ends input of hair device 151 ', and 1 is put by determining the Q ends of frequency clock enabling signal rest-set flip-flop 151 ', and by driving
The driving power pipe of moving cell 152 ' Q1 is turned on.
In the case where determining frequency pattern, the constant-flow driver in the lifting type constant-current drive circuit is by determining frequency clock driving power
The shut-off of pipe, reduces demagnetization detection and overvoltage detection, so that the current constant control of lifting type constant-current drive circuit is simpler, increases
The drive efficiency of constant-flow driver is added.
As shown in fig.8, being the constant current driving method flow chart of one embodiment of the invention, this method is used for by driving work(
Rate pipe makes the back-end circuit of power tube export constant current, the described method comprises the following steps S210~S250.
S210：Sampled signal is obtained, the sampled signal and overcurrent protection benchmark are compared and obtains first and is compared knot
Really；
S220：The sampled signal and constant current output benchmark are subjected to operation amplifier, error result and amplified signal is obtained；
S230：Amplified signal is compensated according to the error result, the amplified signal after being compensated；
S240：Amplified signal after the compensation and triangular signal are compared and obtain the second comparative result；
S250：The power tube conducting is driven according to first comparative result and the second comparative result.
Above-mentioned constant current driving method, the first ratio is obtained by the way that the sampled signal of acquisition and overcurrent protection benchmark are compared
Relatively result；And the sampled signal and constant current output benchmark are subjected to the amplified signal after operation amplifier is compensated；Will be described
Amplified signal after compensation is compared with triangular signal obtains the second comparative result；According to first comparative result and
Two comparative result driving power pipes are turned on, and are improved the constant current output precision and protection circuit of circuit, are made the component in circuit steady
Fixed work.The constant current output precision and protection circuit of circuit are improved, makes the component steady operation in circuit.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of buck-boost type constant-current drive circuit, including：
Constant-flow driver, provided with driving pin and by drive pin output pulse width modulated signal, provided with sampling pin simultaneously
Pass through pin input sample signal of sampling；
Buck main structure, includes power tube, power inductance and the fly-wheel diode of interconnection；Wherein described power tube
The driving pin connection of grid and constant-flow driver, the constant-flow driver is according to the pulse width modulating signal of input to power
Pipe carries out break-make control；
Characterized in that, also include the sampling feedback resistance being connected between the power tube, power inductance and fly-wheel diode,
One end of the sampling feedback resistance is connected with power inductance, the source electrode connection of the other end and power tube, and sampling feedback resistance
The one end being connected with power tube and the sampling pin of constant-flow driver are connected, after the sampling feedback resistance is used for power tube
Size of current in terminal circuit is sampled, and then maintains the rear end constant output current of power tube；The power inductance is with adopting
It is connected again with source electrode one end of power tube after the series connection of sample feedback resistance, the negative electrode of the fly-wheel diode and the source electrode of power tube are straight
Connect in succession；
The constant-flow driver is used to obtain sampled signal by pin of sampling, and by driving pin output pulse width to modulate
Signal controls the break-make of power tube, and then adjusts the component in the constant current accuracy and protection circuit of power tube output current.
2. buck-boost type constant-current drive circuit according to claim 1, it is characterised in that the constant-flow driver is also wrapped
Include：
Compensation pin, for input offset signal；
Pin is detected, for inputting detection signal；
Operational amplifier, for the sampled signal for pin input of sampling to be carried out into operation amplifier with constant current output benchmark, is missed
Poor result, and export the sampled signal after amplification；
First comparator, for the sampled signal for pin input of sampling to be compared with overcurrent protection benchmark, and is adopted described
Sample signal exports the first overcurrent protection signal when exceeding the overcurrent protection benchmark；
Second comparator, for the output result of operational amplifier and triangular signal to be compared, and in operational amplifier
Output result exceed the triangular signal when export the second overcurrent protection signal；
Drive module, receives the first overcurrent protection signal and the first overcurrent protection signal, and by driving pin to export arteries and veins
Rush bandwidth modulation signals；
The inverting input of the operational amplifier be connected with sampling pin, and in the anti-phase defeated of pin and operational amplifier of sampling
Enter and be provided with feedback switch between holding, the conducting sequential of the feedback switch is opposite with the conducting sequential of power tube.
3. buck-boost type constant-current drive circuit according to claim 2, it is characterised in that also including for carrying out error benefit
The integrating capacitor repaid, one end of the integrating capacitor and the compensation pin of constant-flow driver are connected, and it is anti-that the other end is connected to sampling
Between feed resistance and power inductance.
4. buck-boost type constant-current drive circuit according to claim 2, it is characterised in that also including for demagnetization detection with
The first resistor and second resistance of overvoltage detection, the first resistor connects with second resistance, and the first resistor connected and the
Two resistance and the sampling feedback resistance and power inductance connected are in parallel, and the detection pin is connected to first resistor and second resistance
Between.
5. buck-boost type constant-current drive circuit according to claim 2, it is characterised in that the same phase of the operational amplifier
Input inputs constant current output benchmark, inverting input input sample signal, the output end of operational amplifier and the second comparator
Reverse input end connection.
6. buck-boost type constant-current drive circuit according to claim 2, it is characterised in that the same phase of the first comparator
Input is connected with sampling pin, input sample signal；Inverting input inputs overcurrent protection benchmark；Output end and drive module
Connection.
7. buck-boost type constant-current drive circuit according to claim 2, it is characterised in that the same phase of second comparator
Input inputs triangular signal；Reverse input end is connected with the output end of compensation pin and operational amplifier, and input is missed
Sampled signal after difference compensation；Output end is connected with drive module.
8. buck-boost type constant-current drive circuit according to claim 2, it is characterised in that described also including detection module
Detection module includes demagnetization detection unit and over-pressed detection unit, and the input of detection module is connected with detection pin, passes through inspection
Pin input detection signal is surveyed, demagnetization detection and overvoltage detection are carried out to detection signal, and disappear by the output of demagnetization detection unit
Magnetic signal, passes through over-pressed detection unit output over-voltage protection signal.
9. buck-boost type constant-current drive circuit according to claim 2, it is characterised in that the drive module is touched including RS
Device and driver element are sent out, the R ends and S ends of the rest-set flip-flop are connected at least one OR circuit；
The S ends of the rest-set flip-flop are connected with the output end of the first OR circuit, the input input of first OR circuit
Break-make clock signal and/or the demagnetization signal of detection module output；
The R ends of the rest-set flip-flop are connected with the output end of the second OR circuit, the input input of second OR circuit
First overcurrent protection signal and/or the second overcurrent protection signal and/or overvoltage protection signal；
The Q ends of the rest-set flip-flop are connected with driver element.
10. a kind of constant current driving method, the back-end circuit for making power tube by driving power pipe exports constant current, described
Method includes：
Sampled signal is obtained, the sampled signal and overcurrent protection benchmark are compared and obtain the first comparative result；
The sampled signal and constant current output benchmark are subjected to operation amplifier, error result and amplified signal is obtained；
Amplified signal is compensated according to the error result, the amplified signal after being compensated；
Amplified signal after the compensation and triangular signal are compared and obtain the second comparative result；
The power tube conducting is driven according to first comparative result and the second comparative result.
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| CN115190682A (en) * | 2022-09-07 | 2022-10-14 | 深圳利普芯微电子有限公司 | Overvoltage protection circuit and LED drive power supply |
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| CN116384435A (en) * | 2023-03-30 | 2023-07-04 | 华能山东石岛湾核电有限公司 | System and method for judging neglected recording of high-temperature gas cooled reactor counter |
| CN116384435B (en) * | 2023-03-30 | 2024-03-22 | 华能山东石岛湾核电有限公司 | System and method for judging neglected recording of high-temperature gas cooled reactor counter |
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