CN206640842U - Buck-boost type constant-current drive circuit - Google Patents
Buck-boost type constant-current drive circuit Download PDFInfo
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- CN206640842U CN206640842U CN201720371163.XU CN201720371163U CN206640842U CN 206640842 U CN206640842 U CN 206640842U CN 201720371163 U CN201720371163 U CN 201720371163U CN 206640842 U CN206640842 U CN 206640842U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
A kind of buck-boost type constant-current drive circuit is the utility model is related to, 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 of the other end and power tube connects, and the sampling pin of one end for being connected with power tube of sampling feedback resistance and constant-flow driver connects, the sampling feedback resistance is used to sample 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 sampling pin, and by driving pin output pulse width modulated signal to control the break-make of power tube, and then the component in the constant current accuracy of regulation power tube output current and protection circuit.
Description
Technical field
Constant-current supply technical field is the utility model is related to, more particularly to a kind of buck-boost type constant-flow driver.
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.Because tradition lifts
Die mould circuit has the characteristics that efficiency high, exportable high current and quiescent current are small, so buck-boost type circuit is gradually employed
To among LED constant-current driver.In addition, with the increase of production cost, a kind of safety for taking into account cost and performance how is provided
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, need by being adopted to the peak point current for flowing through Q1
Thus the information that output current is calculated of sample and inductive current time of afterflow is brought most so as to indirect control output current
Big problem be output current precision can with input voltage, inductance value error and actuating speed change and change.
In summary, there is the electric current during sampling feedback resistance can not directly sample conducting in the first traditional solution
Information, electric current be present and increase suddenly and cause the inductance saturation risk that even power tube Q1 overcurrent is burnt.Second of traditional solution party
Case, constant current output are changed and changed by input voltage, inductance value error and actuating speed, cause constant current accuracy poor.
Utility model content
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 the problem of constant current output low precision, there is provided one kind can be real
When monitor power tube conducting electric current and improve the buck-boost type constant-current drive circuit 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 and by sampling pin input sample signal；
Buck main structure, including the power tube of interconnection, power inductance and fly-wheel diode；Wherein described power
The driving pin of the grid of pipe and constant-flow driver connects, 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 include the sampling feedback being connected between the power tube, power inductance and fly-wheel diode
Resistance, one end of the sampling feedback resistance are 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 connect, 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 sampling pin, and by driving pin output pulse width
Modulated signal controls the break-make of power tube, and then first device in the constant current accuracy of regulation power tube output current and protection circuit
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 sampling pin input to be carried out into operation amplifier with constant current output benchmark, obtain
To error result, and export the sampled signal after amplification；
First comparator, for the sampled signal by pin input is sampled compared with overcurrent protection benchmark, and in institute
State when sampled signal exceedes the overcurrent protection benchmark and export the first overcurrent protection signal；
Second comparator, for the output result of operational amplifier to be put compared with triangular signal, and in computing
The output result of big device exports the second overcurrent protection signal when exceeding the triangular signal；
Drive module, the first overcurrent protection signal and the first overcurrent protection signal are received, and by driving pin defeated
Go out pulse width modulating signal；
The inverting input of the operational amplifier be connected with sampling pin, and is sampling the anti-of pin and operational amplifier
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 detection the first resistor and second resistance detected with overvoltage,
The first resistor is connected with second resistance, and the first resistor and second resistance connected and the sampling feedback resistance and work(connected
Rate inductance in parallel, the detection pin are 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, it is 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 connects.
In one of the embodiments, in addition to detection module, the detection module include demagnetization detection unit and overvoltage
Detection unit, the input of detection module are connected with detection pin, input detection signal by detecting pin, detection signal is entered
Row demagnetization detects 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.
Above-mentioned buck-boost type constant-current drive circuit, by the way that sampling feedback resistance is arranged at into power tube, power inductance and continued
Flow diode between, both can with the output current information of sampled power pipe conduction device, can sample again afterflow device flow through it is defeated
Go out the current information of load；It is anti-by being set between the sampling pin of constant-flow driver and the inverting input of operational amplifier
Feedback switch, and the conducting sequential of the feedback switch and the conducting sequential of power tube are on the contrary, more accurately obtain to output current
Sampling, improve sampling precision.In summary, the utility model embodiment is realized to electricity maximum during power tube conducting
Stream 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 the embodiment of the utility model one；
Fig. 4 is the constant-flow driver module map of the embodiment of the utility model one；
Fig. 5 be the embodiment of the utility model one in power tube, the conducting sequential of feedback switch and power inductor current with
The comparison of wave shape figure of amplifier input current；
Fig. 6 is the schematic diagram of the buck-boost type constant-current drive circuit of another embodiment of the utility model；
Fig. 7 is the constant-flow driver module map of another embodiment of the utility model.
Embodiment
For the ease of understanding the utility model, the utility model is more fully retouched below with reference to relevant drawings
State.Preferred embodiment of the present utility model is given in accompanying drawing.But the utility model can come in fact in many different forms
It is existing, however it is not limited to embodiment described herein.On the contrary, the purpose for providing these embodiments is made to public affairs of the present utility model
Open the understanding more thorough and comprehensive of content.
Unless otherwise defined, all of technologies and scientific terms used here by the article is led with belonging to technology of the present utility model
The implication that the technical staff in domain is generally understood that is identical.It is simply in term used in the description of the present utility model herein
The purpose of description specific embodiment, it is not intended that limitation the utility model.Term as used herein "and/or" includes one
The arbitrary and all combination of individual or multiple related Listed Items.
A kind of buck-boost type constant-flow driver presented below, for adjusting constant current accuracy and the guarantor of power tube output current
Component in protection circuit.
As shown in fig.3, the schematic diagram of the buck-boost type constant-current drive circuit for the embodiment of the utility model one, the liter
Voltage-dropping type constant-current drive circuit includes constant-flow driver 100, buck main structure 200 and sampling feedback resistance Rcs；The constant current
Driver 100 is provided with driving pin GATE, sampling pin CS, compensation pin COMP and detection pin FB；The main knot of buck
Structure 200 includes power tube Q1, power inductance L and sustained diode；Alternatively, the power tube Q1 can be transistor or MOS
Pipe.
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 connect, 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
It is connected with one end that 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 sampling the sampled signal of pin CS acquisitions
Rate pipe Q1 break-make, and then the component in the constant current accuracy of regulation power tube output current and protection circuit.
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 are 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, pass through compensation pin
COMP gives the input offset signal of constant-flow driver 100.
The first resistor R1 connects with second resistance R2, and the first resistor R1 and second resistance R2 that connect are 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 relationship 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 detect 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 sampling pin CS inputs carrying out computing with constant current output benchmark, obtains error result simultaneously
Output；The first comparator 110 is used for the sampled signal by sampling pin CS inputs 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
Exceed in by the output result of operational amplifier 120 compared with triangular signal, and in the output result of operational amplifier
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 conducting is obtained by sampling pin CS, that is, power inductance L electric current is flowed through, by institute
Output current is stated in real time compared with overcurrent protection benchmark, 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 input of operational amplifier 120 can the complete output informations of sampled power inductance L, and
The power inductance L of sampling output current and constant current output benchmark are subjected to operation amplifier, obtain error result, 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
Pin COMP connects with the output end of operational amplifier 120, and 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 calculates 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,
Two comparators 130 by the sampled signal after the compensation compared with triangular signal, 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 pin FB inputs
Detection signal, demagnetization detection is carried out to the detection signal and overvoltage detects, and 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
The output over-voltage protection signal when detecting circuit overvoltage of detection unit 142, and by fault protection logic to drive module 150
Error protection request is sent, drive module 150 drives power tube Q1 to disconnect after the error protection request is received.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
More effectively protection circuit, the component steady operation in 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 second comparator 130 export the second overcurrent protection signal and/or over-pressed detection unit 142 export overvoltage protection letter
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 S ends input
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 effective, 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, realize both can sample afterflow device stream again with the output current information of sampled power pipe conduction device
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, the utility model embodiment is realized to maximum during power tube conducting
Current protection, reach direct output current feedback and high-precision constant current output effect.Sampling is obtained by sampling pin
Signal, and by driving pin output pulse width modulated signal to control the break-make of power tube, improve the constant current output of circuit
Precision and protection circuit, make the component steady operation in circuit.
In other embodiments, as shown in fig.6, being the utility model embodiment another kind lifting type constant current driving electricity
Road, the lifting type constant-current drive circuit, which works in, to be determined under frequency pattern, then is reduced in circuit for demagnetization detection and overvoltage detection
Resistance, the operation principle of other devices in circuit is identical with circuit shown in Fig. 3, and refers to shown in Fig. 7, is operated in and determines frequency
Constant-flow driver 100 ' under pattern reduces detection pin, and reduces detection module in the inside of constant-flow driver 100 '；
Frequency clock signal is determined in the S ends input of rest-set flip-flop 151 ', puts 1 by the Q ends for determining frequency clock enabling signal rest-set flip-flop 151 ', and lead to
The driving power pipe of over-drive unit 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, reduce demagnetization detection and overvoltage detection, so that the current constant control of lifting type constant-current drive circuit is simpler, increase
The drive efficiency of constant-flow driver is added.
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 that this specification is recorded all is considered to be.
Embodiment described above only expresses several embodiments of the present utility model, and its description is more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent scope.It should be pointed out that the common skill for this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (9)
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
By sampling pin input sample signal；
Buck main structure, including the power tube of interconnection, power inductance and fly-wheel diode；Wherein described power tube
The driving pin of grid and constant-flow driver connects, and 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 connect, 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 sampling pin, and by driving pin output pulse width to modulate
Signal controls the break-make of power tube, and then the component in the constant current accuracy of regulation power tube output current and protection circuit.
2. buck-boost type constant-current drive circuit according to claim 1, it is characterised in that the constant-flow driver also wraps
Include：
Compensation pin, for input offset signal；
Pin is detected, for inputting detection signal；
Operational amplifier, for the sampled signal for sampling pin input to be carried out into operation amplifier with constant current output benchmark, missed
Poor result, and export the sampled signal after amplification；
First comparator, for the sampled signal for sampling pin input to be adopted compared with overcurrent protection benchmark, and described
Sample signal exports the first overcurrent protection signal when exceeding the overcurrent protection benchmark；
Second comparator, for by the output result of operational amplifier compared with triangular signal, and in operational amplifier
Output result export the second overcurrent protection signal when exceeding the triangular signal；
Drive module, the first overcurrent protection signal and the first overcurrent protection signal are received, 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 is sampling the anti-phase defeated of pin and operational amplifier
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 include being used to carry out error benefit
The integrating capacitor repaid, one end of the integrating capacitor and the compensation pin of constant-flow driver connect, 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 include be used for demagnetization detection with
The first resistor and second resistance of overvoltage detection, the first resistor connects with second resistance, and the first resistor of series connection 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 is carried out to detection signal and overvoltage detects, and is disappeared by the output of demagnetization detection unit
Magnetic signal, pass 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
Hair device and driver element, 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.
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| CN201720371163.XU CN206640842U (en) | 2017-04-10 | 2017-04-10 | Buck-boost type constant-current drive circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106982491A (en) * | 2017-04-10 | 2017-07-25 | 深圳市必易微电子有限公司 | Buck-boost type constant-current drive circuit and constant current driving method |
| CN110831284A (en) * | 2019-11-22 | 2020-02-21 | 深圳市芯飞凌半导体有限公司 | LED driving power supply and controller thereof |
| CN110831283A (en) * | 2019-11-22 | 2020-02-21 | 深圳市芯飞凌半导体有限公司 | LED driving power supply and controller thereof |
-
2017
- 2017-04-10 CN CN201720371163.XU patent/CN206640842U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106982491A (en) * | 2017-04-10 | 2017-07-25 | 深圳市必易微电子有限公司 | Buck-boost type constant-current drive circuit and constant current driving method |
| CN110831284A (en) * | 2019-11-22 | 2020-02-21 | 深圳市芯飞凌半导体有限公司 | LED driving power supply and controller thereof |
| CN110831283A (en) * | 2019-11-22 | 2020-02-21 | 深圳市芯飞凌半导体有限公司 | LED driving power supply and controller thereof |
| CN110831283B (en) * | 2019-11-22 | 2021-11-23 | 上海芯飞半导体技术有限公司 | LED driving power supply and controller thereof |
| CN110831284B (en) * | 2019-11-22 | 2022-01-07 | 上海芯飞半导体技术有限公司 | LED driving power supply and controller thereof |
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