CN106102236A - A kind of overcurrent protective cold light LED voltage amplification power circuit - Google Patents
A kind of overcurrent protective cold light LED voltage amplification power circuit Download PDFInfo
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- CN106102236A CN106102236A CN201610522871.9A CN201610522871A CN106102236A CN 106102236 A CN106102236 A CN 106102236A CN 201610522871 A CN201610522871 A CN 201610522871A CN 106102236 A CN106102236 A CN 106102236A
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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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- 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]
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Abstract
The invention discloses a kind of overcurrent protective cold light LED voltage amplification power circuit; it is characterized in that; main by control chip U2; audion VT2; voltage amplification amplifying circuit; diode voltage holding circuit; current rectifying and wave filtering circuit; voltage stabilizing drive circuit; matrix current adjustment circuit; the diode D3 that polar capacitor C5, N pole is connected with the RC pin of control chip U2, P pole is sequentially connected with the VREF pin of control chip U2 after resistance R7 and resistance R8, and the audion current foldback circuit composition being serially connected between OUT pin and the matrix current adjustment circuit of control chip U2.The present invention can effectively prevent input voltage from distortion occur, makes the present invention have superpower voltage endurance capability, can export stable electric current, effectively guarantee the stability of blue LED lamp brightness.The energy consumption of the existing power circuit of observable index of the present invention reduces more than 55%.
Description
Technical field
The present invention relates to electric energy-saving field, specifically, be a kind of overcurrent protective cold light LED voltage amplification power supply
Circuit.
Background technology
At present, due to LED have that energy consumption is low, the feature such as length in service life and safety and environmental protection, it has had become as people
One of the main product of life lighting.Owing to LED is different from traditional electric filament lamp, therefore it needs by special power supply electricity
Road is driven.But, the power circuit that current LED is used not only is easily subject to the impact of external voltage fluctuations, and
And its voltage endurance capability is poor, energy consumption is higher, and output electric current is unstable, thus causes the brightness instability of LED, power consumption, use
Life-span is short.
Therefore it provides one can improve voltage endurance capability, can ensure that again outputting current steadily, energy consumption can also be reduced simultaneously
LED power circuit is the task of top priority.
Summary of the invention
It is an object of the invention to overcome LED voltage circuit of the prior art to there is voltage endurance capability poor, energy consumption is higher,
And the defect that output electric current is unstable, it is provided that a kind of overcurrent protective cold light LED voltage amplification power circuit.
The present invention is achieved through the following technical solutions: a kind of overcurrent protective cold light LED voltage amplification power circuit,
Main by control chip U2, current rectifying and wave filtering circuit, audion VT2, negative pole is connected with the base stage of audion VT2, positive pole sequentially
Through polar capacitor C5, N pole that resistance R6 is connected with the COMP pin of control chip U2 after resistance R5 with control chip U2's
The diode D3 that RC pin is connected, P pole is sequentially connected with the VREF pin of control chip U2 after resistance R8 through resistance R7,
It is serially connected in the voltage amplification amplifying circuit between VCC pin and the current rectifying and wave filtering circuit of control chip U2, respectively with control chip
The matrix current adjustment circuit that the VFB pin of U2 is connected with RC pin, the OUT pin being serially connected in control chip U2 adjusts electricity with electric current
Audion current foldback circuit between road, the resistance to piezoelectricity of diode being serially connected between current rectifying and wave filtering circuit and matrix current adjustment circuit
Road, and the voltage stabilizing drive circuit composition that collector and emitter with audion VT2 is connected respectively；Described diode is pressure
Circuit is connected with voltage stabilizing drive circuit；The IS pin of described control chip U2 is connected with RC pin, its GND pin ground connection.
Described audion current foldback circuit is by audion VT7, audion VT4, audion VT5, audion VT6, positive pole
Sequentially be connected through resistance R33 emitter stage with audion VT7 after resistance R32, the polar capacitor C17 of minus earth, one end
Be connected with the positive pole of polar capacitor C17, resistance R34, the N pole of other end ground connection after resistance R37 with the base stage of audion VT5
Be connected, diode D12 that P pole is connected with the positive pole of polar capacitor C17, positive pole is connected with the base stage of audion VT6, negative
The polar capacitor C20 that pole is sequentially connected with the N pole of diode D12 after resistance R38 through resistance R40, negative pole is after resistance R39
Be connected with the colelctor electrode of audion VT5, polar capacitor C18, N pole that positive pole is connected with the colelctor electrode of audion VT7 is through electricity
Be connected with the colelctor electrode of audion VT4 after resistance R36, diode D11 that P pole is connected with the base stage of audion VT7, positive pole and
The polar capacitor C19 that the colelctor electrode of audion VT4 is connected, negative pole is connected with the N pole of diode D11, one end and audion
The adjustable resistance R35 that the emitter stage of VT7 is connected, the other end is connected with the colelctor electrode of audion VT4, one end and audion
The resistance R41 that the base stage of VT4 is connected, the other end is connected with the emitter stage of audion VT5, and P pole after resistance R42 with
The emitter stage of audion VT4 is connected, the diode D13 of N pole ground connection after adjustable resistance R43 composition；Described audion VT7's
Colelctor electrode is connected with the N pole of diode D12, the grounded emitter of described audion VT6, and its base stage is with adjustable resistance R43's
Controlling end to be connected, its colelctor electrode is connected with the base stage of audion VT5；The emitter stage of described audion VT7 is as audion
The input of current foldback circuit is also connected with the OUT pin of control chip U2；The P pole of described diode D13 is as three poles
The outfan of pipe current foldback circuit is also connected with matrix current adjustment circuit.
What described voltage amplification amplifying circuit was connected with current rectifying and wave filtering circuit by input is worth amplifying circuit, and input partially
Hold the voltage regulator circuit composition that the outfan with value amplifying circuit partially is connected；The outfan of described voltage regulator circuit and control
The VCC pin of coremaking sheet U2 is connected.
Described inclined value amplifying circuit is by amplifier P1, and positive pole electrode input end with amplifier P1 after resistance R22 is connected
Connect, negative pole as the polar capacitor C11 of the input of partially value amplifying circuit, negative pole after resistance R23 with the output of amplifier P1
Polar capacitor C12, the P pole that end is connected, positive pole electrode input end with amplifier P1 after resistance R21 is connected is through resistance
Diode D7, the P pole that after R20, the electrode input end with amplifier P1 is connected, N pole is connected with the negative pole of polar capacitor C12
After resistance R24, the negative input with amplifier P1 is connected, N pole outfan with amplifier P1 after resistance R26 is connected
The diode D8 connect, and negative pole is connected with the negative input of amplifier P1, positive pole after resistance R25 with diode D8's
The polar capacitor C13 composition that N pole is connected；The N of the negative input ground connection of described amplifier P1, its outfan and diode D8
Pole is collectively forming the outfan of value amplifying circuit partially.
Described voltage regulator circuit is connected with the electrode input end of amplifier P2 by amplifier P2, audion VT3, negative pole
Connect, polar capacitor C14, N pole that positive pole is connected with the outfan of amplifier P1 is connected with the base stage of audion VT3, P pole warp
The diode D9 that after inductance L2, negative input with amplifier P2 is connected, negative pole is connected with the outfan of amplifier P2,
The polar capacitor C15 that positive pole is sequentially connected with the N pole of diode D8 after adjustable resistance R27 through resistance R28, negative pole is through resistance
The polarity that after R30, the outfan with amplifier P2 is connected, positive pole emitter stage with audion VT3 after resistance R29 is connected
Electric capacity C16, and P pole is connected with the outfan of amplifier P2, N pole positive pole with polar capacitor C16 after resistance R31 is connected
The diode D10 composition connect；The negative input ground connection of described amplifier P2, the colelctor electrode phase of its outfan and audion VT2
As the outfan of voltage regulator circuit and it is connected with the VCC pin of control chip U2 after connection.
Described current rectifying and wave filtering circuit is by diode rectifier U1, and the cathode output end phase of positive pole and diode rectifier U1
The polar capacitor C1 composition that connection, negative pole are connected with the cathode output end of diode rectifier U1；Described diode rectifier
The input of U1 is connected with the negative pole of polar capacitor C11 as the input of current rectifying and wave filtering circuit, its cathode output end, and it is born
Pole outfan is connected with diode voltage holding circuit.
Described matrix current adjustment circuit is by field effect transistor MOS, and negative pole source electrode with field effect transistor MOS after resistance R15 is connected
Connect, polar capacitor C7, N pole that positive pole is connected with the RC pin of control chip U2 after resistance R13 after resistance R14 with polarity
The diode D4 that the negative pole of electric capacity C7 is connected, P pole is connected with control chip U2RC pin after resistance R12, negative pole is sequentially
Be connected through resistance R10 VFB pin with control chip U2 after resistance R9, positive pole after resistance R11 with the P pole of diode D4
The polar capacitor C6 being connected, negative pole is connected with the grid of field effect transistor MOS, positive pole is connected with the negative pole of polar capacitor C7
Polar capacitor C8, and one end is connected with the drain electrode of field effect transistor MOS, the other end is as the outfan of matrix current adjustment circuit
And the adjustable resistance R16 composition being connected with diode voltage holding circuit；The grid of described field effect transistor MOS and the P of diode D13
Pole is connected.
Described diode voltage holding circuit is inputted with the negative pole of diode rectifier U1 after resistance R1 by audion VT1, P pole
The diode D1 that end is connected, N pole is sequentially connected through resistance R4 colelctor electrode with audion VT1 after polar capacitor C4, just
Pole is connected through the negative input of resistance R2 with diode rectifier U1, polar capacitor C2, the P pole of minus earth and audion
The diode D2 that the emitter stage of VT1 is connected, N pole negative input with diode rectifier U1 after resistance R3 is connected,
And the polar capacitor C3 composition that positive pole is connected with the N pole of diode D2, negative pole is connected with the emitter stage of audion VT1；
The emitter stage of described audion VT1 is collectively forming the outfan of diode voltage holding circuit with the N pole of diode D2 and drives with voltage stabilizing
Galvanic electricity road is connected；The drain electrode with field effect transistor MOS after adjustable resistance R16 of the base stage of described audion VT1 is connected.
Described voltage stabilizing drive circuit is connected by the Same Name of Ends of transformator T, P pole with transformator T secondary inductance coil, N pole
The diode D6 being sequentially connected through resistance R18 emitter stage with audion VT2 after polar capacitor C9, positive pole and diode D6
The polar capacitor C10 that N pole is connected, negative pole non-same polarity with transformator T secondary inductance coil after inductance L1 is connected,
N pole with diode D6 after resistance R19, P pole is connected, the diode D5 of N pole ground connection, and one end is with polar capacitor C10's
The resistance R17 composition that negative pole is connected, the other end is connected with the N pole of diode D5；Described transformator T former limit inductance coil
Same Name of Ends is connected with the emitter stage of audion VT1, the non-same polarity of its transformator T former limit inductance coil and the N of diode D2
Pole is connected；The negative pole of described polar capacitor C10 and the N pole of diode D6 be collectively forming voltage stabilizing drive circuit outfan and with
LED group is connected.
For the practical effect of the present invention, described control chip U2 the most preferentially uses the integrated chip of 3S44 to realize.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) present invention has stronger voltage endurance capability, can export stable electric current, effectively guarantee blue LED lamp brightness
Stability.
(2) present invention has excess current protective function simultaneously, effectively ensure that stability that the present invention uses, reliable
Property.
(3) energy consumption of the present invention is low, and the energy consumption of the existing power circuit of its observable index reduces more than 55%, thus it is born
Loading capability improves more than 60% than the load capacity of existing LED power circuit, and the present invention can provide for many LED simultaneously
Stable operating current.
(4) present invention can save more than 30% electricity, thus meet people to LED control system at energy-saving square
The demand in face.
(5) service life that can effectively extend LED of the present invention, the present invention can make the working time of LED reach 1.2
More than ten thousand hours.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the electrical block diagram of the voltage amplification amplifying circuit of the present invention.
Fig. 3 is the electrical block diagram of the audion current foldback circuit of the present invention.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing thereof, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
As it is shown in figure 1, the present invention is mainly by control chip U2, audion VT2, resistance R5, resistance R6, resistance R7, resistance
R8, polar capacitor C5, diode D3, audion current foldback circuit, voltage amplification amplifying circuit, current rectifying and wave filtering circuit, electric current
Adjust circuit, diode voltage holding circuit, and voltage stabilizing drive circuit composition.
Wherein, the negative pole of polar capacitor C5 is connected with the base stage of audion VT2, positive pole is sequentially through resistance R6 and resistance R5
It is connected with the COMP pin of control chip U2 afterwards.The N pole of diode D3 is connected with the RC pin of control chip U2, P is the most suitable
Secondary it is connected through resistance R7 VREF pin with control chip U2 after resistance R8.Voltage amplification amplifying circuit is serially connected in control core
Between VCC pin and the current rectifying and wave filtering circuit of sheet U2.Matrix current adjustment circuit respectively with VFB pin and the RC pin of control chip U2
It is connected.Audion current foldback circuit is serially connected between OUT pin and the matrix current adjustment circuit of control chip U2.Diode is resistance to
Volt circuit is then serially connected between current rectifying and wave filtering circuit and matrix current adjustment circuit.Voltage stabilizing drive circuit respectively with the collection of audion VT2
Electrode is connected with emitter stage.Described diode voltage holding circuit is connected with voltage stabilizing drive circuit；The IS of described control chip U2
Pin is connected with RC pin, its GND pin ground connection.
Further, described current rectifying and wave filtering circuit is made up of diode rectifier U1 and polar capacitor C1.During connection, polarity
The positive pole of electric capacity C1 is connected with the cathode output end of diode rectifier U1, negative pole exports with the positive pole of diode rectifier U1
End is connected.The input of described diode rectifier U1 is as the input of current rectifying and wave filtering circuit, its cathode output end and pole
The negative pole of property electric capacity C11 is connected, and its cathode output end is connected with diode voltage holding circuit.
Meanwhile, described matrix current adjustment circuit is by field effect transistor MOS, resistance R9, resistance R10, resistance R11, resistance R12, electricity
Resistance R13, resistance R14, resistance R15, polar capacitor C6, polar capacitor C7, polar capacitor C8, and diode D4 composition.
During connection, the negative pole of polar capacitor C7 source electrode with field effect transistor MOS after resistance R15 is connected, positive pole is through electricity
It is connected with the RC pin of control chip U2 after resistance R13.The N pole of diode D4 after resistance R14 with the negative pole of polar capacitor C7
Be connected, P pole is connected with control chip U2RC pin after resistance R12.The negative pole of polar capacitor C6 sequentially through resistance R10 and
After resistance R9, the VFB pin with control chip U2 is connected, positive pole P pole with diode D4 after resistance R11 is connected.
Wherein, the negative pole of polar capacitor C8 be connected with the grid of field effect transistor MOS, the negative pole of positive pole and polar capacitor C7
It is connected.One end of adjustable resistance R16 is connected with the drain electrode of field effect transistor MOS, defeated as matrix current adjustment circuit of the other end
Go out end and be connected with diode voltage holding circuit.The grid of described field effect transistor MOS is connected with the P pole of diode D13.
Further, described diode voltage holding circuit by audion VT1, resistance R1, resistance R2, resistance R3, resistance R4,
Polar capacitor C2, polar capacitor C3, diode D1, and diode D2 form.
During connection, the N pole of diode D1 positive pole with polar capacitor C4 after resistance R4 is connected, described polar capacitor C4
Negative pole be connected with the colelctor electrode of audion VT1, the P pole of described diode D1 after resistance R1 with diode rectifier U1's
Negative input is connected.The positive pole of polar capacitor C2 is connected through the negative input of resistance R2 with diode rectifier U1,
Minus earth.The P pole of diode D2 is connected with the emitter stage of audion VT1, N pole after resistance R3 with diode rectifier U1
Negative input be connected.The positive pole of polar capacitor C3 is connected with the N pole of diode D2, negative pole is sent out with audion VT1's
Emitter-base bandgap grading is connected.
The emitter stage of described audion VT1 and the N pole of diode D2 are collectively forming the outfan of diode voltage holding circuit also
It is connected with voltage stabilizing drive circuit；The base stage of described audion VT1 after adjustable resistance R16 with the drain electrode phase of field effect transistor MOS
Connect.
Meanwhile, described voltage stabilizing drive circuit is by transformator T, resistance R17, resistance R18, resistance R19, polar capacitor C9, pole
Property electric capacity C10, diode D5, diode D6, and inductance L1 composition.
During connection, the N pole of diode D6 positive pole with polar capacitor C9 after resistance R18 is connected, described polar capacitor
The negative pole of C9 is connected with the emitter stage of audion VT2, and the P pole of described diode D6 is same with transformator T secondary inductance coil
Name end is connected.The positive pole of polar capacitor C10 is connected with the N pole of diode D6, negative pole after inductance L1 with transformator T secondary
The non-same polarity of inductance coil is connected.N pole with diode D6 after resistance R19, the P pole of diode D5 is connected, N pole connects
Ground.One end of resistance R17 is connected with the negative pole of polar capacitor C10, the other end is connected with the N pole of diode D5.
The Same Name of Ends of described transformator T former limit inductance coil is connected with the emitter stage of audion VT1, and T is former for its transformator
The non-same polarity of limit inductance coil is connected with the N pole of diode D2；The negative pole of described polar capacitor C10 and the N of diode D6
Pole is collectively forming the outfan of voltage stabilizing drive circuit and is connected with LED group.
As in figure 2 it is shown, described voltage amplification amplifying circuit is formed with transmission of electricity voltage regulator circuit by being partially worth amplifying circuit.Described
Value amplifying circuit partially is by amplifier P1, resistance R20, resistance R21, resistance R22, resistance R23, resistance R24, resistance R25, resistance
R26, polar capacitor C11, polar capacitor C12, polar capacitor C13, diode D7, and diode D8 form.
During connection, the positive pole of polar capacitor C11 electrode input end with amplifier P1 after resistance R22 is connected, negative pole
As the input of partially value amplifying circuit and it is connected with current rectifying and wave filtering circuit.The negative pole of polar capacitor C12 after resistance R23 with
The outfan of amplifier P1 is connected, positive pole electrode input end with amplifier P1 after resistance R21 is connected.Diode D7's
P pole electrode input end with amplifier P1 after resistance R20 is connected, N pole is connected with the negative pole of polar capacitor C12.
Wherein, the P pole of diode D8 negative input with amplifier P1 after resistance R24 is connected, N pole is through resistance
After R26, the outfan with amplifier P1 is connected.The negative pole of polar capacitor C13 is connected with the negative input of amplifier P1,
Positive pole N pole with diode D8 after resistance R25 is connected.The negative input ground connection of described amplifier P1, its outfan with
The N pole of diode D8 is collectively forming the outfan of value amplifying circuit partially.
Further, described voltage regulator circuit is by amplifier P2, audion VT3, adjustable resistance R27, resistance R28, electricity
Resistance R29, resistance R30, resistance R31, polar capacitor C14, polar capacitor C15, polar capacitor C16, diode D9, diode D10,
And inductance L2 composition.
During connection, the negative pole of polar capacitor C14 is connected with the electrode input end of amplifier P2, positive pole and amplifier P1
Outfan is connected.The N pole of diode D9 is connected with the base stage of audion VT3, P pole negative with amplifier P2 after inductance L2
Pole input is connected.The negative pole of polar capacitor C15 is connected with the outfan of amplifier P2, positive pole sequentially through resistance R28 and
After adjustable resistance R27, the N pole with diode D8 is connected.
Meanwhile, the negative pole of polar capacitor C16 outfan with amplifier P2 after resistance R30 is connected, positive pole is through resistance
After R29, the emitter stage with audion VT3 is connected.The P pole of diode D10 is connected with the outfan of amplifier P2, N pole is through electricity
It is connected with the positive pole of polar capacitor C16 after resistance R31.The negative input ground connection of described amplifier P2, its outfan and three poles
The colelctor electrode of pipe VT2 as the outfan of voltage regulator circuit and is connected with the VCC pin of control chip U2 after being connected.
As it is shown on figure 3, described audion current foldback circuit is by audion VT4, audion VT5, audion VT6, three poles
Pipe VT7, resistance R32, resistance R33, resistance R34, adjustable resistance R35, resistance R36, resistance R37, resistance R38, resistance R39, electricity
Resistance R40, resistance R41, resistance R42, adjustable resistance R43, polar capacitor C17, polar capacitor C18, polar capacitor C19, polarity electricity
Hold C20, diode D11, diode D12, and diode D13 composition.
During connection, the positive pole of polar capacitor C17 sequentially after resistance R33 and resistance R32 with the emitter stage phase of audion VT7
Connection, minus earth.One end of resistance R34 is connected with the positive pole of polar capacitor C17, other end ground connection.The N of diode D12
Pole base stage with audion VT5 after resistance R37 is connected, P pole is connected with the positive pole of polar capacitor C17.Polar capacitor C20
Positive pole be connected with the base stage of audion VT6, negative pole sequentially after resistance R40 and resistance R38 with the N pole phase of diode D12
Connect.
Wherein, the negative pole of polar capacitor C18 colelctor electrode with audion VT5 after resistance R39 be connected, positive pole and three poles
The colelctor electrode of pipe VT7 is connected.The N pole of diode D11 colelctor electrode with audion VT4 after resistance R36 is connected, P pole with
The base stage of audion VT7 is connected.The positive pole of polar capacitor C19 is connected with the colelctor electrode of audion VT4, negative pole and diode
The N pole of D11 is connected.
Meanwhile, adjustable resistance R35 is serially connected between the emitter stage of audion VT7 and the colelctor electrode of audion VT4.Resistance
R41 is serially connected between the base stage of audion VT4 and the emitter stage of audion VT5.The P pole of diode D13 after resistance R42 with three
The emitter stage of pole pipe VT4 is connected, N pole ground connection after adjustable resistance R43.
The colelctor electrode of described audion VT7 is connected with the N pole of diode D12, and the emitter stage of described audion VT6 connects
Ground, its base stage is connected with the control end of adjustable resistance R43, and its colelctor electrode is connected with the base stage of audion VT5；Described three poles
The emitter stage of pipe VT7 as the input of audion current foldback circuit and is connected with the OUT pin of control chip U2；Described
The P pole of diode D13 as the outfan of audion current foldback circuit and is connected with matrix current adjustment circuit.
During operation, the present invention can effectively prevent input voltage distortion, makes the present invention have superpower voltage endurance capability, can be
It is constant that the external voltage of input occurs carrying out electric wave during fluctuation, makes internal circuit of the present invention obtain stable operating current.Simultaneously
The present invention can also carry out overcurrent protection to the electric current of output, and the voltage x current of output can carry out blood pressure lowering fall stream process, for LED
Lamp provides stable voltage and current, effectively guarantees the stability of blue light brightness.The energy consumption of the present invention is low, and its observable index is existing
The energy consumption of some power circuits reduces more than 55%, thus its load capacity is than the load capacity of existing LED power circuit
Improve more than 60%, the present invention can provide stable operating current for many LED simultaneously.
The present invention can not only save the electricity of more than 30%, moreover it is possible in the effective service life extending LED, makes LED
Working time reaches more than 1.2 ten thousand hours.Thus meet people to LED control system in the demand of energy-conservation aspect.In order to
The practical effect of the present invention, the integrated chip of 3S44 that described control chip U2 the most preferentially uses stable performance realizes.
According to above-described embodiment, can well realize the present invention.
Claims (10)
1. an overcurrent protective cold light LED voltage amplification power circuit, it is characterised in that main by control chip U2, whole
Stream filter circuit, audion VT2, negative pole is connected with the base stage of audion VT2, positive pole sequentially after resistance R6 and resistance R5 and
Polar capacitor C5, the N pole that the COMP pin of control chip U2 is connected is connected with the RC pin of control chip U2, P pole sequentially
Through the diode D3 that resistance R7 is connected with the VREF pin of control chip U2 after resistance R8, it is serially connected in control chip U2's
Voltage amplification amplifying circuit between VCC pin and current rectifying and wave filtering circuit, respectively with VFB pin and the RC pin of control chip U2
The matrix current adjustment circuit being connected, stream crossed by the audion being serially connected between OUT pin and the matrix current adjustment circuit of control chip U2
Protection circuit, the diode voltage holding circuit being serially connected between current rectifying and wave filtering circuit and matrix current adjustment circuit, and respectively with three poles
The voltage stabilizing drive circuit composition that the collector and emitter of pipe VT2 is connected；Described diode voltage holding circuit drives electricity with voltage stabilizing
Road is connected；The IS pin of described control chip U2 is connected with RC pin, its GND pin ground connection.
A kind of overcurrent protective cold light LED voltage amplification power circuit the most according to claim 1, it is characterised in that
Described audion current foldback circuit is by audion VT7, audion VT4, audion VT5, audion VT6, and positive pole is sequentially through electricity
Be connected with the emitter stage of audion VT7 after resistance R33 and resistance R32, the polar capacitor C17 of minus earth, one end and polarity electricity
The positive pole holding C17 is connected, resistance R34, the N pole of other end ground connection base stage with audion VT5 after resistance R37 is connected, P
The diode D12 that pole is connected with the positive pole of polar capacitor C17, positive pole is connected with the base stage of audion VT6, negative pole sequentially warp
The polar capacitor C20 being connected with the N pole of diode D12 after resistance R40 and resistance R38, negative pole after resistance R39 with audion
Polar capacitor C18, the N pole that the colelctor electrode of VT5 is connected, positive pole is connected with the colelctor electrode of audion VT7 after resistance R36 with
The diode D11 that the colelctor electrode of audion VT4 is connected, P pole is connected with the base stage of audion VT7, positive pole and audion VT4
The polar capacitor C19 that colelctor electrode is connected, negative pole is connected with the N pole of diode D11, the transmitting of one end and audion VT7
The adjustable resistance R35 that pole is connected, the other end is connected with the colelctor electrode of audion VT4, the base stage phase of one end and audion VT4
Connect, the resistance R41 that is connected with the emitter stage of audion VT5 of the other end, and P pole after resistance R42 with audion VT4's
Emitter stage is connected, the diode D13 of N pole ground connection after adjustable resistance R43 composition；The colelctor electrode and two of described audion VT7
The N pole of pole pipe D12 is connected, the grounded emitter of described audion VT6, and its base stage is connected with the control end of adjustable resistance R43
Connecing, its colelctor electrode is connected with the base stage of audion VT5；The emitter stage of described audion VT7 is as audion overcurrent protection electricity
The input on road is also connected with the OUT pin of control chip U2；The P pole of described diode D13 is as audion overcurrent protection
The outfan of circuit is also connected with matrix current adjustment circuit.
A kind of overcurrent protective cold light LED voltage amplification power circuit the most according to claim 2, it is characterised in that
What described voltage amplification amplifying circuit was connected with current rectifying and wave filtering circuit by input is worth amplifying circuit partially, and input is worth with inclined
The voltage regulator circuit composition that the outfan of amplifying circuit is connected；The outfan of described voltage regulator circuit and control chip U2
VCC pin be connected.
A kind of overcurrent protective cold light LED voltage amplification power circuit the most according to claim 3, it is characterised in that
Described inclined value amplifying circuit is by amplifier P1, and positive pole electrode input end with amplifier P1 after resistance R22 is connected, negative pole is made
For the polar capacitor C11 of the partially input of value amplifying circuit, negative pole outfan with amplifier P1 after resistance R23 is connected,
Polar capacitor C12, the P pole that positive pole electrode input end with amplifier P1 after resistance R21 is connected after resistance R20 with amplification
Diode D7, the P pole that the electrode input end of device P1 is connected, N pole is connected with the negative pole of polar capacitor C12 is after resistance R24
Be connected with the negative input of amplifier P1, diode that N pole outfan with amplifier P1 after resistance R26 is connected
D8, and negative pole is connected with the negative input of amplifier P1, positive pole N pole with diode D8 after resistance R25 is connected
Polar capacitor C13 composition；The negative input ground connection of described amplifier P1, its outfan shape extremely common with the N of diode D8
Become the outfan being partially worth amplifying circuit.
A kind of overcurrent protective cold light LED voltage amplification power circuit the most according to claim 4, it is characterised in that
Described voltage regulator circuit by amplifier P2, audion VT3, negative pole is connected with the electrode input end of amplifier P2, positive pole with
Polar capacitor C14, the N pole that the outfan of amplifier P1 is connected is connected with the base stage of audion VT3, P pole is after inductance L2
The diode D9 being connected with the negative input of amplifier P2, negative pole is connected with the outfan of amplifier P2, positive pole sequentially
Through the polar capacitor C15 that resistance R28 is connected with the N pole of diode D8 after adjustable resistance R27, negative pole after resistance R30 with
The polar capacitor C16 that the outfan of amplifier P2 is connected, positive pole emitter stage with audion VT3 after resistance R29 is connected,
And two poles that P pole is connected with the outfan of amplifier P2, N pole positive pole with polar capacitor C16 after resistance R31 is connected
Pipe D10 forms；The negative input ground connection of described amplifier P2, its outfan is made after being connected with the colelctor electrode of audion VT2
For the outfan of voltage regulator circuit and it is connected with the VCC pin of control chip U2.
A kind of overcurrent protective cold light LED voltage amplification power circuit the most according to claim 5, it is characterised in that
Described current rectifying and wave filtering circuit, by diode rectifier U1, is connected with the cathode output end of positive pole with diode rectifier U1, bears
The polar capacitor C1 composition that pole is connected with the cathode output end of diode rectifier U1；The input of described diode rectifier U1
Holding the input as current rectifying and wave filtering circuit, its cathode output end is connected with the negative pole of polar capacitor C11, its cathode output end
It is connected with diode voltage holding circuit.
A kind of overcurrent protective cold light LED voltage amplification power circuit the most according to claim 6, it is characterised in that
Described matrix current adjustment circuit is by field effect transistor MOS, and negative pole source electrode with field effect transistor MOS after resistance R15 is connected, positive pole warp
Polar capacitor C7, the N pole being connected with the RC pin of control chip U2 after resistance R13 after resistance R14 with polar capacitor C7's
The diode D4 that negative pole is connected, P pole is connected with control chip U2RC pin after resistance R12, negative pole is sequentially through resistance R10
Be connected with VFB pin with control chip U2 after resistance R9, positive pole is connected with the P pole of diode D4 after resistance R11
Polar capacitor C6, the polarity electricity that negative pole is connected with the grid of field effect transistor MOS, positive pole is connected with the negative pole of polar capacitor C7
Hold C8, and one end is connected with the drain electrode of field effect transistor MOS, the other end as matrix current adjustment circuit outfan and with two poles
The adjustable resistance R16 composition that pipe voltage holding circuit is connected；The grid of described field effect transistor MOS is extremely connected with the P of diode D13
Connect.
A kind of overcurrent protective cold light LED voltage amplification power circuit the most according to claim 7, it is characterised in that
Described diode voltage holding circuit is connected by audion VT1, P pole negative input with diode rectifier U1 after resistance R1
Connect, diode D1 that N pole is sequentially connected through resistance R4 colelctor electrode with audion VT1 after polar capacitor C4, positive pole is through electricity
The negative input of resistance R2 and diode rectifier U1 is connected, polar capacitor C2, the P pole of minus earth and audion VT1
The diode D2, Yi Jizheng that emitter stage is connected, N pole negative input with diode rectifier U1 after resistance R3 is connected
The polar capacitor C3 composition that pole is connected with the N pole of diode D2, negative pole is connected with the emitter stage of audion VT1；Described three
The emitter stage of pole pipe VT1 and the N pole of diode D2 be collectively forming diode voltage holding circuit outfan and with voltage stabilizing drive circuit
It is connected；The drain electrode with field effect transistor MOS after adjustable resistance R16 of the base stage of described audion VT1 is connected.
A kind of overcurrent protective cold light LED voltage amplification power circuit the most according to claim 8, it is characterised in that
Described voltage stabilizing drive circuit is connected by the Same Name of Ends of transformator T, P pole with transformator T secondary inductance coil, N pole is sequentially through electricity
The diode D6 that is connected with the emitter stage of audion VT2 after resistance R18 and polar capacitor C9, the N pole phase of positive pole and diode D6
Connect, polar capacitor C10, P pole that negative pole non-same polarity with transformator T secondary inductance coil after inductance L1 is connected is through electricity
Be connected with the N pole of diode D6 after resistance R19, the diode D5 of N pole ground connection, and the negative pole phase of one end and polar capacitor C10
The resistance R17 composition that connection, the other end are connected with the N pole of diode D5；The Same Name of Ends of described transformator T former limit inductance coil
Being connected with the emitter stage of audion VT1, the non-same polarity of its transformator T former limit inductance coil is extremely connected with the N of diode D2
Connect；The negative pole of described polar capacitor C10 and the N pole of diode D6 are collectively forming outfan and the LED of voltage stabilizing drive circuit
Group is connected.
A kind of overcurrent protective cold light LED voltage amplification power circuit the most according to claim 9, it is characterised in that
Described control chip U2 is the integrated chip of 3S44.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610522871.9A CN106102236A (en) | 2016-07-05 | 2016-07-05 | A kind of overcurrent protective cold light LED voltage amplification power circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610522871.9A CN106102236A (en) | 2016-07-05 | 2016-07-05 | A kind of overcurrent protective cold light LED voltage amplification power circuit |
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| CN106102236A true CN106102236A (en) | 2016-11-09 |
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ID=57212229
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|---|---|---|---|
| CN201610522871.9A Withdrawn CN106102236A (en) | 2016-07-05 | 2016-07-05 | A kind of overcurrent protective cold light LED voltage amplification power circuit |
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| CN (1) | CN106102236A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113990256A (en) * | 2020-07-27 | 2022-01-28 | 精工爱普生株式会社 | Image light generating device and image display device |
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2016
- 2016-07-05 CN CN201610522871.9A patent/CN106102236A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113990256A (en) * | 2020-07-27 | 2022-01-28 | 精工爱普生株式会社 | Image light generating device and image display device |
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