CN108055730A - Constant-current switch power source control circuit, chip and LED drive circuit - Google Patents
Constant-current switch power source control circuit, chip and LED drive circuit Download PDFInfo
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- CN108055730A CN108055730A CN201711456875.2A CN201711456875A CN108055730A CN 108055730 A CN108055730 A CN 108055730A CN 201711456875 A CN201711456875 A CN 201711456875A CN 108055730 A CN108055730 A CN 108055730A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
Abstract
The invention belongs to power electronics fields, provide a kind of three end constant-current switch power source control circuits, control chip and LED drive circuit.The three ends constant-current switch power source control circuit includes：A reference source, the first sample circuit, the second sample circuit, Time-sharing control drive module, the lowest point detection module, power switching modules and power control module；Wherein a reference source is connected between charging end and ground terminal and generates reference voltage；First sample circuit samples the difference in voltage of reference voltage and ground terminal to obtain the first sampled signal according to the first control drive signal；Second sample circuit is sampled to obtain the second sampled signal according to the second control drive signal to the voltage of charging end and the difference of reference voltage；Time-sharing control drive module is according to the i.e. controllable power switching modules output d. c. voltage signal of corresponding sampled signal；Solve the problems, such as that the design cost of circuit in the prior art is higher and random error is larger by the present invention.
Description
Technical field
The invention belongs to power electronics field more particularly to a kind of three end constant-current switch power source control circuits, controls
Chip and LED drive circuit.
Background technology
In the prior art, constant-current switch power source control circuit can be converted into surely according to the periodic current of external world's input
Surely the stabilized power source exported；In constant-current switch power source control circuit, stored accordingly in charging process by energy-storage travelling wave tube
Electric energy, during power switch pipe disconnects or turns off, energy-storage travelling wave tube exports the electric energy, and regulator circuit is in memory element
Always the stability of the control circuit output voltage can be kept in charge and discharge process, constant-current switch power source is made to be constantly in stabilization
Operating status.
Then, the prior art has at least the following problems：Due to needing independent junction field effect transistor power supply,
In the constant-current switch power source control circuit, multiple junction field effect transistors are set, cause the complicated of the control circuit and
Design cost is high；The uniformity inside the control circuit is only capable of reaching ± 5% simultaneously, then controls electricity in the constant-current switch power source
There are larger random errors in road.
The content of the invention
The present invention provides a kind of three end constant-current switch power source control circuits, control chip and LED drive circuit, it is intended to solve
The design cost of three end constant-current switch power source control circuits is higher and the problem of random error is larger in the prior art.
First aspect present invention provides a kind of three end constant-current switch power source control circuits, including：
It is connected between charging end and ground terminal, for the base according to power supply signal or charging signals generation reference voltage
Quasi- source；
It is connected with a reference source, for controlling drive signal to the reference voltage and the ground terminal according to first
Difference in voltage is sampled to obtain the first sample circuit of the first sampled signal；
It is connected with a reference source, for according to voltage of the second control drive signal to the charging end and the benchmark
Difference in voltage is sampled to obtain the second sample circuit of the second sampled signal；
Be connected with first sample circuit and second sample circuit, for according to first sampled signal with
And the second sampled signal generation described first controls drive signal, the second control drive signal and cut-off signals,
With detected in predetermined time threshold values the lowest point signal or more than the predetermined time threshold values generation Continuity signal timesharing control
Drive module processed；
It is connected between power end and ground terminal, for exporting the work(of d. c. voltage signal under cut-off signals driving
Rate switch module；
It is connected with the Time-sharing control drive module, for detecting that the demagnetization resonance potential of the power switching modules is believed
Number when generate the lowest point detection module of the lowest point signal；And
It is connected between a reference source and the power switching modules, for generating institute according to the d. c. voltage signal
State the power control module of power supply signal.
Further, first sample circuit includes：First switch, first comparator and the first capacitance；
The first switch is connected between the in-phase input end of a reference source and the first comparator, and described first
Capacitance connection is between the in-phase input end of the charging end and the first comparator, the anti-phase input of the first comparator
End is connected with the ground terminal, and the output terminal of the first comparator exports first sampled signal.
Further, second sample circuit includes：Second switch, the second capacitance and the second comparator；
The second switch is connected between a reference source and the in-phase input end of second comparator, second electricity
Hold between the in-phase input end for connecting second comparator and the ground terminal, the inverting input of second comparator with
The charging end connection, the output terminal of second comparator export second sampled signal.
Further, the power switching modules include power switch pipe；
The G ends of wherein described power switch pipe are connected with the Time-sharing control drive module, the D ends of the power switch pipe
It is connected with the power end, the S ends of the power switch pipe are connected with the ground terminal, the JS ends output of the power switch pipe
The d. c. voltage signal.
Second aspect of the present invention provides one kind three end constant-current switch power source control chips, including three end as described above constant current
Switching power source control circuit；
It is connected with the charging end of the three ends constant-current switch power source control circuit, for accessing the charging of the charging signals
Pin；
It is connected with the power end of the three ends constant-current switch power source control circuit, the power supply for accessing DC power supply draws
Foot；And
The ground pin being connected with the ground terminal of the three ends constant-current switch power source control circuit.
Third aspect present invention provides a kind of LED drive circuit, and for driving LED array, the LED array is included at least
One LED lamp bead, including：
Three end as described above constant-current switch power source control chip；
For exporting the rectification filtering module of the DC power supply；
The first end and the power supply of three end constant-current switch power source control chip for being connected to the rectification filtering module are drawn
Between foot, for storing the accumulator of electric energy, wherein, the LED array is in parallel with the accumulator；
It is connected to the charging pins and the second of the rectification filtering module of three end constant-current switch power source control chip
Between end, for generating the charging circuit of the charging signals；And
It is connected to the second end of the ground pin and the rectification filtering module of three end constant-current switch power source control chip
Between sampling resistor.
Further, the rectification filtering module includes the first diode, the second diode, the 3rd diode, the four or two
Pole pipe and the 3rd capacitance；
The anode of wherein described first diode, the anode of second diode, the 3rd diode cathode with
And the cathode of the 4th diode is used to connect AC power；
The first end of the cathode of first diode, the cathode of second diode and the 3rd capacitance is institute
State the first end of rectification filtering module, anode, the anode and the described 3rd of the 4th diode of the 3rd diode
The second end of capacitance is the second end of the rectification filtering module.
Further, the 3rd switch is further included；
3rd switch connects the anode of first diode and the cathode of the 3rd diode and the friendship
Between galvanic electricity source.
Further, the accumulator includes：Filter capacitor, inductance and fly-wheel diode；
The first end of wherein described filter capacitor and the cathode of the fly-wheel diode and the rectification filtering module
First end connects, and the second end of the filter capacitor is connected with the first end of the inductance, the second end of the inductance and institute
The anode for stating fly-wheel diode is connected with the power pins of three end constant-current switch power source control chip.
Further, the charging circuit includes power supply capacitor；
The charging pins and the rectifying and wave-filtering of power supply capacitor connection three end constant-current switch power source control chip
Between the second end of module.
The present invention is referring now to the advantageous effects acquired by the prior art：At above-mentioned three end, constant-current switch power source controls
Circuit samples the difference in voltage of reference voltage and ground terminal by the first sample circuit, passes through the second sample circuit
The voltage and reference voltage of charging end are sampled, since the mismatch design of the two sample circuits has what is cancelled out each other
Effect, can be down to less than ± 3% by the uniformity of the constant-current switch power source control circuit, reduce random error；Pass through introducing
Integrated power switching modules can export corresponding d. c. voltage signal, provide corresponding DC power supply, so as to simplify this
The structure of control circuit, reduces industrial cost；Efficiently solve three end constant-current switch power source control circuit in the prior art
Design cost it is higher and the problem of random error is larger.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, for
For those skilled in the art, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is a kind of circuit structure diagram of three ends constant-current switch power source control circuit provided in an embodiment of the present invention；
Fig. 2 is a kind of circuit structure diagram of three end constant-current switch power source control chip provided in an embodiment of the present invention；
Fig. 3 is a kind of circuit structure diagram of LED drive circuit provided in an embodiment of the present invention；
Fig. 4 is a kind of structure diagram of LED lamp provided in an embodiment of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 shows the circuit structure diagram of three ends constant-current switch power source control circuit provided in an embodiment of the present invention, in order to
Convenient for explanation, illustrate only with the relevant part of the embodiment of the present invention, details are as follows：
As shown in Figure 1, the three ends constant-current switch power source control circuit 10 includes：A reference source 101, the first sample circuit 102,
Second sample circuit 103, Time-sharing control drive module 104, power switching modules 105, the lowest point detection module 106 and confession are automatically controlled
Molding block 107.
Wherein a reference source 101 is connected between charging end 108 and ground terminal 109, a reference source 101 according to power supply signal or
Charging signals generate reference voltage；Specifically, the charging end 108 is circumscribed with charging module, if there are the power supply signal, benchmark
Source 101 generates reference voltage according to the power supply signal, and the power supply signal is charged by charging end 108 to charging module；If
When a reference source 101 can not receive the power supply signal, charging module exports charging signals, a reference source by charging end 108 at this time
101 generate reference voltage according to the charging signals.
Specifically, the first sample circuit 102 is connected with a reference source 101, the first sample circuit 102 drives according to the first control
Signal is sampled to obtain the first sampled signal to the difference in voltage of the reference voltage and ground terminal 109；When the first sampling electricity
Road 102 receive a reference source 101 generation reference voltage and ground terminal 109 voltage when, due to the reference voltage and connect
The voltage of ground terminal 109 is simultaneously unequal, and the first sample circuit 102 adopts the difference in voltage of the reference voltage and ground terminal 109
I.e. available first sampled signal of sample.
Specifically, the second sample circuit 103 is connected with a reference source 101, the second sample circuit 103 drives according to the second control
Signal is sampled to obtain the second sampled signal to the voltage of charging end 108 and the difference of reference voltage.Time-sharing control drive module
104 are connected with the first sample circuit 102 and the second sample circuit 103, when the first sample circuit 102 by the first sampled signal with
And second sample circuit 103 when second sampled signal is transmitted to Time-sharing control drive module 104, Time-sharing control drive module
104 according to the first sampled signal and the second sampled signal generation first control drive signal, second control drive signal and
Cut-off signals；Further, if the first sampled signal and the second sampled signal are overturn, Time-sharing control drive module
104 export the cut-off signals；Time-sharing control drive module 104 detects the lowest point signal in predetermined time threshold values or more than this
Predetermined time threshold values generates Continuity signal, wherein the predetermined time threshold values is to set in advance.
Specifically, power switching modules 105 are connected between power end 110 and ground terminal 109, power switching modules 105 exist
The lower output d. c. voltage signal of cut-off signals driving, wherein power end 110 are used for input DC power, work as power switching modules
When between 105 connection power ends 110 and ground terminal 109, power switching modules 105 are under cut-off signals driving according to the direct current
Source exports d. c. voltage signal；It is understood that if Time-sharing control drive module 104 is led to the output of power switching modules 105
Messenger, power switching modules 105 are in the conduction state at this time, can't outwards export d. c. voltage signal.
Specifically, the lowest point detection module 106 is connected with Time-sharing control drive module 104, the lowest point detection module 106 detects work(
The lowest point signal is generated during the demagnetization resonance potential signal of rate switch module 105；When Time-sharing control drive module 104 is by cut-off signals
When being transmitted to power switching modules 105, power switching modules 105 receive the voltage outwards exported during the cut-off signals and can generate
Certain fluctuation, if the lowest point detection module 106 detects that the lowest point for the fluctuation voltage that power switching modules 105 export occurs
It carves, the lowest point detection module 106 can then generate the lowest point signal, and by the lowest point signal transmission to Time-sharing control drive module 104, from
And feedback control is formed between the lowest point detection module 106 and Time-sharing control drive module 104, ensure the three ends constant-current switch power source
Control circuit 10 has higher stability.
Specifically, power control module 107 is connected between a reference source 101 and power switching modules 105, power supply control mould
The d. c. voltage signal that block 107 is exported according to power switching modules 105 generates the power supply signal, and the power supply signal is transmitted
To a reference source 101.
Specifically, the first sample circuit 102 includes：First switch K1, first comparator Comp1 and the first capacitance C1；
Wherein first switch K1 is connected between the in-phase input end of a reference source 101 and first comparator Comp1, the first capacitance C1 connections
Between the in-phase input end of charging end 108 and first comparator Comp1, the inverting input of first comparator Comp1 is with connecing
Ground terminal 109 connects, and the output terminal of first comparator Comp1 exports the first sampled signal.
Specifically, the first capacitance C1 is connected between the in-phase input end of first comparator Comp1 and charging end 108, then
Difference between the reference voltage that the voltage at the first capacitance C1 both ends is the voltage of charging end 108 and a reference source 101 generates, by
Exist in the voltage of the reference voltage that the in-phase input end of first comparator Comp1 accesses and the ground terminal of inverting input access
Difference, first comparator Comp1 is according to the difference, that is, exportable first sampled signal；Compare it is understood that working as first
When the in-phase input end of device Comp1 and the input voltage of inverting input change, then the output of first comparator Comp1
First sampled signal of end output can also occur to change accordingly.
Specifically, the second sample circuit 103 includes：Second switch K2, the second capacitance C2 and the second comparator Comp1；
Wherein between the in-phase input end of second switch K2 connections a reference source 101 and the second comparator Comp2, the second capacitance C2 connections
Between the in-phase input end of two comparator Comp2 and ground terminal 109, the inverting input of the second comparator Comp2 and charging end
108 connections, the output terminal of the second comparator Comp2 export second sampled signal.
Specifically, power switching modules 105 include power switch pipe M0；Wherein the G ends of power switch pipe M0 and timesharing control
Drive module 104 processed connects, and the D ends of power switch pipe M0 are connected with power end 110, the S ends of power switch pipe M0 and ground terminal
109 connections, the JS ends of power switch pipe M0 export the d. c. voltage signal.
Optionally, power switch pipe M0 is JFET (Junction Field-Effect Transistor, junction field
Transistor), since the D ends of power switch pipe M0 are connected with power end 110, then the D of power switch pipe M0 is terminated into DC power supply,
When cut-off signals are transmitted to the D ends at the G ends, at this time power switch pipe M0 of power switch pipe M0 by Time-sharing control drive module 104
Equiva lent impedance between S ends is larger, then the JS ends of power switch pipe M0 are high level, and power switch pipe M0, which is in, disconnects rank
Section, i.e. the JS ends of power switch pipe M0 export d. c. voltage signal to power control module 107；If Time-sharing control drive module
104 are transmitted to Continuity signal at the G ends of power switch pipe M0, then the equivalent resistance between the D ends of power switch pipe M0 and S ends at this time
Anti- minimum, i.e., the voltage phase difference between power end 110 and ground terminal 109 is smaller, then the JS ends of power switch pipe M0 are low level,
Power switch pipe M0 is on the stage, and the JS ends of power switch pipe M0 can't export directly to power control module 107 at this time
Flow voltage signal.
In order to illustrate the embodiment of the present invention with good, with reference to Fig. 1, illustrate above-mentioned three by a specific example
The workflow of constant-current switch power source control circuit 10 is held, it is specific as follows：
In initial conditions, power switch pipe M0 is the disconnected phase, is inputted at this time by power end 110 to power switch pipe M0
DC power supply, the voltage at the D ends of power switch pipe M0 rise, and the JS ends output d. c. voltage signal of power switch pipe M0 is used for
Electric energy is provided to power control module 107；Then power control module 107 is exported according to the d. c. voltage signal to a reference source 101
The voltage rising of power supply signal, at this time charging end 108, after the voltage of charging end 108, which constantly rises, reaches operating voltage, base
Quasi- source 101 generates reference voltage according to the power supply signal, and first switch K1 and second switch K2 is in closure state at this time, the
One sample circuit 102 samples the difference in voltage of reference voltage and ground terminal 109, first comparator Comp1 outputs first
Sampled signal, similarly, the second sample circuit 103 sample the voltage of charging end 108 and the difference of reference voltage, and second compares
Device Comp2 exports the second sampled signal；When first sampled signal and the second sampled signal keep stablizing, Time-sharing control driving
Module 104 generates the first control drive signal and exports to first switch K1 and generation the second control drive signal output respectively
To second switch K2, disconnected for first switch K1 to be controlled to disconnect with second switch K2, and Time-sharing control drive module 104 to
Power switching modules 105 export Continuity signal, for power switch pipe M0 to be controlled to turn on.
When power switch pipe M0 is turned on, power control module 107 then can't to 101 out-put supply signal of a reference source,
The noninverting input of first comparator Comp1 is connected with the first capacitance C1, then first comparator Comp1 is according to its in-phase input end
And the difference in voltage of inverting input input exports the first sampled signal, the second comparator Comp2 is according to its in-phase input end
And the difference in voltage of inverting input input exports the second sampled signal, when the detection of Time-sharing control drive module 104 obtains the
When one sampled signal signal overturning occurs with the second sampled signal, Time-sharing control drive module 104 is exported to power switch pipe M0
Cut-off signals, at this time power switch pipe M0 return to the disconnected phase, i.e. the JS ends output DC voltage of power switch pipe M0
Signal, at this time Time-sharing control drive module 104 generate respectively first control drive signal export to first switch K1 and generation
Second control drive signal is exported to second switch K2, for first switch K1 conductings to be controlled to be turned on second switch K2.
When power switch pipe M0 is disconnected, the voltage of power switch pipe M0 outputs is present with corresponding fluctuation, i.e. power is opened
The voltage for closing the G ends of pipe M0 is present with certain fluctuation, and the lowest point detection module 106 holds the voltage at the G ends of power switch pipe M0
It is continuous to be detected, if the lowest point detection module 106 detects in the voltage at the G ends of power switch pipe M0 in predetermined time threshold values
The lowest point signal is not detected during the signal of the lowest point or more than the predetermined time threshold values, then Time-sharing control drive module 104
Continuity signal is exported to the G ends of power switch pipe M0, for power switch pipe M0 to be controlled to turn on, the JS of power switch pipe M0 at this time
End output is low level, i.e. the JS ends of power switch pipe M0 can't export d. c. voltage signal.
Pass through the above-mentioned analysis for three end constant-current switch power source control circuits, 10 workflow, the first sample circuit
102 and second sample circuit 103 be respectively 50% to the contribution degree of the control circuit 10；If by first switch K1, the first electricity
The uniformity for holding the first sample circuit 102 of C1 and first comparator Comp1 compositions is ± 5%, i.e. the first sample circuit 102
Uniformity distribution obey the Gaussian Profile of μ 1=1, σ 1=0.0167, be denoted as：
X1~N (μ 1, σ 12)=N (1,0.01672)；
If by the one of second switch K2, the second capacitance C2 and the second comparator Comp2 the second sample circuit 103 formed
Cause property (± 3 σ) is ± 5%, i.e. μ 2=1, the Gauss point of σ 2=0.0167 are obeyed in the uniformity distribution of the second sample circuit 103
Cloth is denoted as：
X2~N (μ 2, σ 22)=N (1,0.01672)；
When the first sample circuit 102 and the second sample circuit 103 are respectively under autonomous working state, by the first sampling
The control system of 102 and second sample circuit 103 of circuit composition uniformity under conditions of Time-sharing control is distributed as X3=50%*
X1+50%*X2, distribution are denoted as X3~N (μ 3, σ 32), according to Gauss theory：
μ 3=50%* μ 1+50%* μ 2=1；
σ32=(50%* σ 1)2+ (50%* σ 2)2=0.01182；
That is X3~N (1,0.01182)；The control system being then made of the first sample circuit 102 and the second sample circuit 103
Uniformity is ± 3.53%.
If the first sample circuit 102 and the second sample circuit 103 are respectively under dependent working condition, the first sampling
Correlation ρ=﹣ 0.5 of circuit 102 and the second sample circuit 103, wherein " ﹣ " represent polarity on the contrary, 0.5 represent similarity, this
When, the control system that is made of the first sample circuit 102 and the second sample circuit 103 uniformity under conditions of Time-sharing control
X3=50%*X1+50%*X2 is distributed as, is denoted as X3~N (μ 3, σ 32), according to Gauss theory：
μ 3=50%* μ 1+50%* μ 2=1；
σ32=(50%* σ 1)2+ (50%* σ 2)2+ 50%* ρ * σ 1* σ 2=0.00832；
That is X3~N (1,0.00832), the control being made of at this time the first sample circuit 102 and the second sample circuit 103
System conformance is ± 2.5%.
By above-mentioned analysis, no matter the first sample circuit 102 and the second sample circuit 103 be in autonomous working state or
Dependent working condition, the stochastic error generated when exporting the first sampled signal by the first sample circuit 102 and the second sampling
Circuit 103, which exports the stochastic error generated during the second sampled signal, to be played an important role of to cancel out each other；Further, when first adopts
102 and second sample circuit 103 of sample circuit is in design during matched, the first sample circuit 102 and the second sample circuit 103
Uniformity be down to less than ± 3%, so as to significantly reduce the random error of the three ends constant-current switch power source control circuit 10.
Fig. 2 shows the circuit structure diagram of three end provided in an embodiment of the present invention constant-current switch power source control chip 20, in detail
It states as follows：
As shown in Fig. 2, three end constant-current switch power source control chips 20 include three end constant-current switch power source control circuits 10, fill
Electric pin VCC, power pins D and ground pin GND.
Wherein, charging pins VCC is connected with the charging end 108 of three end constant-current switch power source control circuits 10, charging pins
VCC is used for charging signals, which is generated by charging module external charging pins VCC；Power pins D and three end constant currents
The power end 110 of switching power source control circuit 10 connects, and power pins D is for exporting DC power supply, so as to drive three end permanent
Current switching power supply control chip 20 acts；Ground pin GND and the ground terminal 109 of three end constant-current switch power source control circuits 10 connect
It connects；Specifically, when controlling 20 inputing power of chip to the three ends constant-current switch power source by power pins D, the three ends constant current
Switching Power Supply control chip 20 can make the voltages keep constant state between the voltage of its output.
Fig. 3 shows LED provided in an embodiment of the present invention (Light Emitting Diode, light emitting diode) driving electricity
The circuit structure diagram on road, details are as follows：
As shown in figure 3, the LED drive circuit, for driving LED array 304, wherein LED array 304 includes at least one
LED lamp bead, the LED drive circuit include three end constant-current switch power source control chips 20, rectification filtering module 301, accumulator
302nd, charging circuit 303 and sampling resistor RCS。
Rectification filtering module 301 exports DC power supply；Specifically, when the input terminal incoming transport of rectification filtering module 301
During power supply, rectification filtering module 301 can be according to the AC power direct output of DC current source.Accumulator 302 is connected to whole
It flows between the first end of filter module 301 and the power pins D of three end constant-current switch power source control chips 20, accumulator 302
For storing electric energy, and LED array 304 is in parallel with accumulator 302, specifically, when rectification filtering module 301 is electric to energy storage
When road 302 exports DC power supply, accumulator 302 stores corresponding electric energy and exports stable electricity to LED array 304 simultaneously
Can, for keeping the operating voltage at 304 both ends of LED array constant.
Specifically, charging circuit 303 is connected to charging pins VCC and the rectification of three end constant-current switch power source control chips 20
Between the second end of filter module 301；According to the above-mentioned analytic process for three end constant-current switch power source control chips 20, three ends
Constant-current switch power source control chip 20 can export electric energy, i.e. charging process by charging pins VCC to charging circuit 303；It charges
Circuit 303 also can control chip 20 to export electric energy, i.e. discharge process by charging pins VCC to three end constant-current switch power sources.It adopts
Sample resistance RCSIt is connected to the second end of the ground pin GND and rectification filtering module 301 of three end constant-current switch power source control chips 20
Between.
Specifically, rectification filtering module 301 includes the first diode D0, the second diode D1, the 3rd diode D2, the 4th
Diode D3 and the 3rd capacitance CIN；
The wherein anode of the first diode D0, the anode of the second diode D1, the cathode and the 4th of the 3rd diode D2
The cathode of diode D3 is used to connect AC power AC；The cathode of first diode D0, the cathode of the second diode D1 and
Three capacitance CINFirst end be rectification filtering module first end 301, anode, the sun of the 4th diode D3 of the 3rd diode D2
Pole and the 3rd capacitance CINSecond end be rectification filtering module 301 second end.
Specifically, work as through the anode of the first diode D0, the anode of the second diode D1, the cathode of the 3rd diode D2
And the 4th diode D3 cathode input ac voltage when, due to the one-way conduction of diode, by rectification filtering module
After 301 rectification and filtering, 301 first end of rectification filtering module and second end output DC power supply, so as to the rectifying and wave-filtering
Module 301 realizes the transfer process between AC signal and direct current signal.
Specifically, the LED drive circuit further includes the 3rd switch F0, the 3rd switch F0Connect the anode of the first diode D0
And the 3rd diode D2 cathode and AC power AC between, the 3rd switch F0For controlling the work of the LED drive circuit
State, if the 3rd switch F0It disconnects, then the LED drive circuit is in halted state, at this point, LED array 304 does not work；
If the 3rd switch F0It is closed, which drives the LED array 304 to be maintained at normal operating conditions.
Specifically, accumulator 302 includes：Filter capacitor CL, inductance L0And sustained diode 4.
Wherein filter capacitor CLFirst end and sustained diode 4 cathode and rectification filtering module 301 first end
Connection, filter capacitor CLSecond end and inductance L0First end connection, inductance L0Second end and sustained diode 4 sun
Pole is connected with the power pins D of three end constant-current switch power source control chips 20.
Specifically, wherein sustained diode 4 can ensure to be input to the power pins D's of Switching Power Supply control chip 20
DC power supply will not generate mutation, when the shut-off suddenly of the switch in the LED drive circuit or conducting, be connected to Switching Power Supply
It controls the sustained diode 4 of the power pins D of chip 20 that the voltage for preventing accumulator 302 from exporting can be made to be in steady to become
Change state avoids damaging relative electronic components；Therefore, core is controlled by the accumulator 302 and Switching Power Supply
Piece 20 can export constant power supply to LED array 304.
Specifically, charging circuit 303 includes power supply capacitor CVCC；Power supply capacitor CVCCConnect three end constant-current switch power source controls
Between the charging pins VCC of chip 20 and the second end of rectification filtering module 301.
Illustrate the operation principle of above-mentioned LED drive circuit with reference to Fig. 1-3.
When exporting DC power supply to accumulator 302 by rectification filtering module 301, if three end constant-current switch power source controls
Control power switch pipe M0 inside coremaking piece 20 is on the stage, then the inductance L in accumulator 3020Storage it is corresponding
Electric energy, power supply capacitor C at this timeVCCIn discharge process；If the control work(inside three end constant-current switch power source control chips 20
Rate switching tube M0 is in disconnected phase, inductance L0Electric energy is discharged to the power pins D of three end constant-current switch power source control chips 20,
Power supply capacitor C at this timeVCCIn charging process；I.e. three end constant-current switch power source control chips 20 pass through internal power switch
Pipe M0 on or off can realize the number to release energy for accumulator 302 during each charge or discharge；Into
One step, since LED array 304 is in parallel with accumulator 302, then three end constant-current switch power sources control 20 indirect control of chip
The operating voltage at 304 both ends of LED array；So as to control the i.e. adjustable LED array 304 of chip 20 by three end constant-current switch power sources
The operating voltage at both ends maintains constant state always, ensures its trouble free service.
Fig. 4 shows the structure diagram of LED lamp 40 provided in an embodiment of the present invention, and details are as follows：
The LED lamp 40 includes LED array 304, which includes at least one LED lamp bead, the wherein LED light
40 LED drive circuit 50 also as described above of tool；LED array 304 is connected with LED drive circuit 50, passes through the LED drive circuit
50 can drive the LED array 304 to be in steady-working state.
By the embodiment of the present invention, in the three ends constant-current switch power source control chip, pass through integrated power switch mould
Block, that is, exportable d. c. voltage signal makes the electronic component of the three ends constant-current switch power source control chip internal be in stabilization
Operating status simplifies the internal structure of the three ends constant-current switch power source control chip, reduces being manufactured into for the control chip
This, reduces the quantity of the device of the control chip internal, improves the reliability of the control chip；First introduced simultaneously is adopted
Sample circuit and the second sample circuit can offset the stochastic error generated each other under conditions of Time-sharing control, improve this three
Hold the control performance of constant-current switch power source control chip；When constant-current switch power source control chip application in three end is driven in LED
During circuit, the voltage constant at LED array both ends can be made by the control chip, so as to ensure the stable operation of LED array；Effectively
Manufacture that ground solves three end constant-current switch power sources control chips in the prior art is of high cost, random error is larger and controlling
Can be poor the problem of.
It should be noted that herein, such as first and second etc relational terms are used merely to an entity
Distinguished with another entity, without necessarily requiring or implying between these entities there are any this actual relation or
Person's order.And term " comprising ", "comprising" or any other variant are intended to non-exclusive inclusion, so that bag
Include the product of a series of elements or the element that structure is intrinsic.In the absence of more restrictions, by sentence " bag
Include ... " or " including ... " limit element, it is not excluded that at the process including the element, method, article or end
Also there are other elements in end equipment.In addition, herein, " being more than ", " being less than ", " being more than " etc. are interpreted as not including this
Number；" more than ", " following ", " within " etc. be interpreted as including this number.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of three end constant-current switch power source control circuits, which is characterized in that including：
It is connected between charging end and ground terminal, for the benchmark according to power supply signal or charging signals generation reference voltage
Source；
It is connected with a reference source, for the voltage according to the first control drive signal to the reference voltage and the ground terminal
Difference sampled to obtain the first sample circuit of the first sampled signal；
It is connected with a reference source, for according to voltage of the second control drive signal to the charging end and the reference voltage
Difference sampled to obtain the second sample circuit of the second sampled signal；
It is connected with first sample circuit and second sample circuit, for according to first sampled signal and institute
State the second sampled signal generation it is described first control drive signal, it is described second control drive signal and cut-off signals and
Detect that the lowest point signal or the Time-sharing control more than predetermined time threshold values generation Continuity signal drive in predetermined time threshold values
Dynamic model block；
It is connected between power end and ground terminal, the power for exporting d. c. voltage signal under cut-off signals driving is opened
Close module；
It is connected with the Time-sharing control drive module, during for detecting the demagnetization resonance potential signal of the power switching modules
Generate the lowest point detection module of the lowest point signal；And
It is connected between a reference source and the power switching modules, for generating the electricity according to the d. c. voltage signal
The power control module of source signal.
2. three ends constant-current switch power source control circuit according to claim 1, which is characterized in that first sample circuit
Including：First switch, first comparator and the first capacitance；
The first switch is connected between the in-phase input end of a reference source and the first comparator, first capacitance
Be connected between the in-phase input end of the charging end and the first comparator, the inverting input of the first comparator with
The ground terminal connection, the output terminal of the first comparator export first sampled signal.
3. three ends constant-current switch power source control circuit according to claim 1, which is characterized in that second sample circuit
Including：Second switch, the second capacitance and the second comparator；
The second switch is connected between a reference source and the in-phase input end of second comparator, and second capacitance connects
Connect between in-phase input end and the ground terminal of second comparator, the inverting input of second comparator with it is described
Charging end connects, and the output terminal of second comparator exports second sampled signal.
4. three ends constant-current switch power source control circuit according to claim 1, which is characterized in that the power switching modules
Including power switch pipe；
The G ends of wherein described power switch pipe are connected with the Time-sharing control drive module, the D ends of the power switch pipe and institute
Power end connection is stated, the S ends of the power switch pipe are connected with the ground terminal, described in the JS ends output of the power switch pipe
D. c. voltage signal.
5. three end constant-current switch power source control chip of one kind, which is characterized in that including three any one of claim 1-4
Hold constant-current switch power source control circuit；
It is connected with the charging end of the three ends constant-current switch power source control circuit, the charging for accessing the charging signals is drawn
Foot；
It is connected with the power end of the three ends constant-current switch power source control circuit, for accessing the power pins of DC power supply；With
And
The ground pin being connected with the ground terminal of the three ends constant-current switch power source control circuit.
6. a kind of LED drive circuit, for driving LED array, the LED array includes at least one LED lamp bead, and feature exists
In, including：
Three end as claimed in claim 5 constant-current switch power source control chip；
For exporting the rectification filtering module of the DC power supply；
Be connected to the first end of the rectification filtering module and three end constant-current switch power source control chip power pins it
Between, for storing the accumulator of electric energy, wherein, the LED array is in parallel with the accumulator；
Be connected to the charging pins of three end constant-current switch power source control chip and the rectification filtering module second end it
Between, for generating the charging circuit of the charging signals；And
It is connected between the ground pin of three end constant-current switch power source control chip and the second end of the rectification filtering module
Sampling resistor.
7. LED drive circuit according to claim 6, which is characterized in that the rectification filtering module includes the one or two pole
Pipe, the second diode, the 3rd diode, the 4th diode and the 3rd capacitance；
The anode of wherein described first diode, the anode of second diode, the cathode of the 3rd diode and institute
The cathode of the 4th diode is stated for connecting AC power；
The first end of the cathode of first diode, the cathode of second diode and the 3rd capacitance is described whole
Flow the first end of filter module, the anode of the 3rd diode, the anode of the 4th diode and the 3rd capacitance
Second end be the rectification filtering module second end.
8. LED drive circuit according to claim 7, which is characterized in that further include the 3rd switch；
3rd switch connects the anode of first diode and the cathode of the 3rd diode and the alternating current
Between source.
9. LED drive circuit according to claim 6, which is characterized in that the accumulator includes：Filter capacitor, electricity
Sense and fly-wheel diode；
The first end of wherein described filter capacitor and the cathode of the fly-wheel diode and the first of the rectification filtering module
End connection, the second end of the filter capacitor is connected with the first end of the inductance, the second end of the inductance and described continues
The anode for flowing diode is connected with the power pins of three end constant-current switch power source control chip.
10. LED drive circuit according to claim 6, which is characterized in that the charging circuit includes power supply capacitor；
The charging pins and the rectification filtering module of power supply capacitor connection three end constant-current switch power source control chip
Second end between.
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| CN201711456875.2A CN108055730B (en) | 2017-12-28 | 2017-12-28 | Constant-current switching power supply control circuit, chip and LED driving circuit |
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| CN201711456875.2A CN108055730B (en) | 2017-12-28 | 2017-12-28 | Constant-current switching power supply control circuit, chip and LED driving circuit |
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| CN111884494A (en) * | 2020-07-23 | 2020-11-03 | 成都启臣微电子股份有限公司 | Quasi-resonance valley bottom conduction circuit with compensation function |
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| CN108055730B (en) | 2023-07-11 |
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