CN106211420A - Overpressure-proof type LED multiple-output electric power based on composite buffering circuit - Google Patents
Overpressure-proof type LED multiple-output electric power based on composite buffering circuit Download PDFInfo
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- CN106211420A CN106211420A CN201610522494.9A CN201610522494A CN106211420A CN 106211420 A CN106211420 A CN 106211420A CN 201610522494 A CN201610522494 A CN 201610522494A CN 106211420 A CN106211420 A CN 106211420A
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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
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- 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 overpressure-proof type LED multiple-output electric power based on composite buffering circuit, it is characterized in that, main by diode rectifier U, transformator T, control chip U1, negative pole is connected with the cathode output end of diode rectifier U, the electric capacity C1 that positive pole is connected with the VFIN pin of control chip U1 after resistance R1, positive pole is connected with the cathode output end of diode rectifier U, the electric capacity C7 that negative pole is sequentially connected with the VCC pin of control chip U1 after electric capacity C4 through resistance R9, it is serially connected in the second-order filter circuit between the secondary inductance coil of transformator T and diode rectifier U, the overvoltage crowbar being connected with second-order filter circuit, the switching signal drive circuits being connected with overvoltage crowbar and second-order filter circuit respectively etc. form.The present invention can effectively prevent instantaneous high current from damaging LED, makes LED operation more stable, extends the working life of LED greatly.
Description
Technical field
The present invention relates to electronic applications, specifically refer to a kind of overpressure-proof type LED multichannel based on composite buffering circuit
Out-put supply.
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.Along with illuminating effect requirement is improved constantly by the universal of LED and people, to LED electricity
Source brings new challenge.The coefficient of stability of the most traditional LED power is the highest, and it is easily subject to electromagnetic signal interference, very
The illuminating effect of LED is reduced, it is impossible to reach the lighting requirement of people in big degree.
Summary of the invention
It is an object of the invention to overcome the defect that the stability of traditional LED power is low, it is provided that a kind of based on compound slow
Rush the overpressure-proof type LED multiple-output electric power of circuit.
The purpose of the present invention is achieved through the following technical solutions: overpressure-proof type LED based on composite buffering circuit is with many
Road out-put supply, mainly by diode rectifier U, transformator T, control chip U1, negative pole is defeated with the negative pole of diode rectifier U
Going out the electric capacity C1 that end is connected, positive pole is connected after resistance R1 with the VFIN pin of control chip U1, positive pole is whole with diode
The cathode output end of stream device U is connected, negative pole is sequentially connected through resistance R9 VCC pin with control chip U1 after electric capacity C4
Electric capacity C7, be serially connected in the second-order filter circuit between the secondary inductance coil of transformator T and diode rectifier U, with second order
The overvoltage crowbar that filter circuit is connected, the switching signal being connected with overvoltage crowbar and second-order filter circuit respectively
Drive circuit, the composite buffering circuit being serially connected between the OUT pin of control chip U1 and switching signal drive circuit, positive pole with
The electric capacity C3 that the OUT pin of control chip U1 is connected, negative pole is connected with the CS pin of control chip U1 after resistance R2, just
The electric capacity C2 that pole is connected with the RT pin of control chip U1, negative pole is connected with switching signal drive circuit after resistance R5,
The resistance R4 being serially connected between the VREF pin of control chip U1 and the negative pole of electric capacity C2, and with the secondary inductance of transformator T
The multiplex output circuit composition that coil is connected；The GND pin ground connection of described control chip U1.
Further, described composite buffering circuit by audion VT5, audion VT6, field effect transistor MOS2, amplifier P1,
Amplifier P2, amplifier P3, one end is connected with the base stage of audion VT5, the other end then with the OUT pin phase of control chip U1
Connect resistance R24, one end is connected with the colelctor electrode of audion VT5, the other end after resistance R26 with field effect transistor MOS2
Resistance R25, the P pole that is connected of drain electrode is connected with the emitter stage of audion VT5, N pole after resistance R28 with field effect transistor MOS2
Source electrode the diode D8, the resistance R27 being serially connected between the source electrode of field effect transistor MOS2 and the negative pole of amplifier P2 that are connected,
The diode D9 that N pole is connected with the negative pole of amplifier P2, P pole then outfan with amplifier P1 is connected, positive pole and amplification
The electric capacity C19 that the positive pole of device P2 is connected, negative pole then outfan with amplifier P2 is connected, is serially connected in the output of amplifier P2
Resistance R31 between end and the colelctor electrode of audion VT6, is serially connected between the positive pole of amplifier P3 and the base stage of audion VT6
Resistance R30, positive pole is connected with the outfan of amplifier P3, negative pole then forms the electric capacity of outfan of this composite buffering circuit
C21, and negative pole is connected with the emitter stage of audion VT6, positive pole negative pole with amplifier P1 after resistance R29 is connected
Electric capacity C20 forms；The described colelctor electrode of audion VT5 is connected with the grid of field effect transistor MOS2；Described amplifier P1 is just
Pole is connected with the N pole of diode D8, its negative pole and the equal ground connection of outfan；The negative pole of described amplifier P3 is defeated with amplifier P1's
Go out end to be connected；The outfan of described composite buffering circuit is then connected with switching signal drive circuit.
Described overvoltage crowbar is by processing chip U4, and audion VT3, audion VT4, field effect transistor MOS1, positive pole is made
The electric capacity C15 being then connected with the drain electrode of field effect transistor MOS1 for the input of this overvoltage crowbar, negative pole, is serially connected in electric capacity
Resistance R15, P pole between positive pole and the colelctor electrode of audion VT3 of C15 is connected with the emitter stage of audion VT3, N pole then
Be connected with the positive pole of electric capacity C15 with diode D5, the P pole that is connected of GND pin processing chip U4, N pole is after resistance R16
The diode D6 being connected with the N pole of diode D5, is serially connected between the base stage of audion VT3 and the ON pin processing chip U4
Resistance R18, be serially connected in electric capacity C15 negative pole and process chip U4 VCC pin between resistance R19, be serially connected in process core
Resistance R17 between TIMER pin and the N pole of diode D5 of sheet U4, positive pole is connected with the negative pole of electric capacity C15, negative pole then
The electric capacity C16 being connected with the SENSE pin processing chip U4, is serially connected in the grid of field effect transistor MOS1 and processes chip U4's
Resistance R20 between GATE pin, one end is connected with the source electrode of field effect transistor MOS1, the other end then after inductance L5 with three poles
The resistance R21 that the base stage of pipe VT4 is connected, positive pole is connected with the grid of field effect transistor MOS1, negative pole is then with audion VT4's
The electric capacity C17 that colelctor electrode is connected, is serially connected in the resistance between the FB pin and the emitter stage of audion VT4 that process chip U4
The Zener diode D7 that R22, N pole is connected with the emitter stage of audion VT4, P pole is then connected with the N pole of diode D5, with
And positive pole electric capacity C18 that base stage is connected, negative pole is then connected with the N pole of diode D5 with audion VT4 after resistance R23
Composition；The GND pin ground connection of described process chip U4；The junction point of described resistance R21 and inductance L5 then forms this overvoltage protection
The outfan of circuit is also connected with second-order filter circuit；The input of described overvoltage crowbar then drives electricity with switching signal
Road is connected.
Described second-order filter circuit, by audion VT1, is serially connected in cathode output end and the audion of diode rectifier U
Resistance R11 between the base stage of VT1, positive pole is connected with the cathode output end of diode rectifier U, negative pole then with transformator T
The electric capacity C8 that is connected of the Same Name of Ends of former limit inductance coil L1, be serially connected in negative pole and the colelctor electrode of audion VT1 of electric capacity C8
Between resistance R12, N pole be connected with the Same Name of Ends of the former limit inductance coil L2 of transformator T, the diode D2 of P pole ground connection, string
The resistance R10 being connected between the emitter stage of audion VT1 and the P pole of diode D2, positive pole is connected with the emitter stage of audion VT1
Connect, electric capacity C9 that negative pole then non-same polarity with the former limit inductance coil L1 of transformator T is connected, and positive pole is with electric capacity C8's
Negative pole is connected, the negative pole electric capacity C10 composition that then negative pole with electric capacity C9 is connected after diode D1；Described transformator T's
The non-same polarity ground connection of former limit inductance coil L2；The negative pole of described electric capacity C9 is also connected with the outfan of overvoltage crowbar.
Described switching signal drive circuit, by audion VT2, field effect transistor MOS, is serially connected in the base stage of audion VT2 with multiple
Close buffer circuit outfan between resistance R3, positive pole is connected with the P pole of diode D2, negative pole after resistance R7 with three poles
The electric capacity C5 that the colelctor electrode of pipe VT2 is connected, positive pole is connected with the input of overvoltage crowbar, negative pole after resistance R8 with
The electric capacity C6 that the drain electrode of field effect transistor MOS is connected, and one end is connected with the source electrode of field effect transistor MOS, other end ground connection
Resistance R6 composition；The emitter stage of described audion VT2 negative pole with electric capacity C2 after resistance R5 is connected, its colelctor electrode then with
The grid of field effect transistor MOS is connected.
Described multiplex output circuit is by the first output circuit being connected with the secondary inductance coil L3 of transformator T, with change
The second output circuit composition that the secondary inductance coil L4 of depressor T is connected；Described first output circuit is by manostat U2, P pole
Two poles that non-same polarity is connected, N pole is then connected with the IN pin of manostat U2 with the secondary inductance coil L3 of transformator T
Pipe D3, positive pole is connected with the N pole of diode D3, negative pole then Same Name of Ends with the secondary inductance coil L3 of transformator T is connected
Electric capacity C11, the electric capacity C13 that positive pole is connected with the OUT pin of manostat U2, negative pole then negative pole with electric capacity C11 is connected,
And one end is connected with the positive pole of electric capacity C13, the other end then negative pole with electric capacity C13 is collectively forming this first output circuit
The resistance R13 composition of outfan；The GND pin of described manostat U2 be connected with the negative pole of electric capacity C11 while ground connection.
Described second output circuit is connected by the non-same polarity of manostat U3, P pole with the secondary inductance coil L4 of transformator T
Connect, diode D4 that N pole is then connected with the IN pin of manostat U3, positive pole is connected with the N pole of diode D4, negative pole then with
The electric capacity C12 that the Same Name of Ends of the secondary inductance coil L4 of transformator T is connected, positive pole is connected with the OUT pin of manostat U3,
The electric capacity C14 that negative pole then negative pole with electric capacity C12 is connected, and one end is connected with the positive pole of electric capacity C14, the other end then with
The negative pole of electric capacity C14 is collectively forming the resistance R14 composition of the outfan of this second output circuit；The GND pipe of described manostat U3
Foot be connected with the negative pole of electric capacity C12 while ground connection.
Described control chip U1 is the integrated chip of UC3842, and described manostat U2 and manostat U3 is W7806 voltage stabilizing core
Sheet, described process chip U4 is the integrated chip of LT1641-2.
The present invention compared with the prior art, has the following advantages and beneficial effect:
(1) electromagnetic interference signal can effectively be filtered by the present invention, it is to avoid electromagnetic interference signal affects the present invention
Stability so that LED operation is more stable.
(2) present invention uses the integrated chip of UC3842 to combine peripheral circuit, so that the structure of the present invention is simpler, joint
Can, more traditional regulated power supply energy consumption saves 40%.
(3) power supply self and LED lamp can be protected by the present invention when there is overvoltage, it is to avoid by overvoltage
Damage.
(4) present invention can effectively prevent instantaneous high current from damaging LED, makes LED operation more stable, extends greatly
The working life of LED.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the overvoltage crowbar structure chart of the present invention.
Fig. 3 is the composite buffering circuit structure diagram of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to
This.
Embodiment
As it is shown in figure 1, the overpressure-proof type LED multiple-output electric power based on composite buffering circuit of the present invention, mainly
By diode rectifier U, transformator T, control chip U1, negative pole is connected with the cathode output end of diode rectifier U, positive pole
The electric capacity C1 being connected with the VFIN pin of control chip U1 after resistance R1, positive pole exports with the positive pole of diode rectifier U
The electric capacity C7 that end is connected, negative pole is sequentially connected with the VCC pin of control chip U1 after electric capacity C4 through resistance R9, is serially connected in
Second-order filter circuit between secondary inductance coil and the diode rectifier U of transformator T, is connected with second-order filter circuit
Overvoltage crowbar, the switching signal drive circuit being connected with overvoltage crowbar and second-order filter circuit respectively, it is serially connected in
The OUT of the composite buffering circuit between OUT pin and the switching signal drive circuit of control chip U1, positive pole and control chip U1
The electric capacity C3 that pin is connected, negative pole is connected with the CS pin of control chip U1 after resistance R2, positive pole and control chip U1
The electric capacity C2 that RT pin is connected, negative pole is connected with switching signal drive circuit after resistance R5, be serially connected in control chip
Resistance R4 between VREF pin and the negative pole of electric capacity C2 of U1, and it is connected many with the secondary inductance coil of transformator T
Road output circuit composition；The GND pin ground connection of described control chip U1.In order to preferably implement the present invention, described control chip
The integrated chip of the preferred UC3842 of U1 realizes.
Described second-order filter circuit is by audion VT1, resistance R11, resistance R12, resistance R10, electric capacity C8, electric capacity C9, electricity
Hold C10, diode D1 and diode D2 composition.
During connection, resistance R11 is serially connected between the cathode output end of diode rectifier U and the base stage of audion VT1.Electricity
The positive pole holding C8 is connected with the cathode output end of diode rectifier U, its negative pole then with the former limit inductance coil L1 of transformator T
Same Name of Ends be connected.Resistance R12 is serially connected between the negative pole of electric capacity C8 and the colelctor electrode of audion VT1.The N pole of diode D2
Be connected with the Same Name of Ends of the former limit inductance coil L2 of transformator T, its P pole ground connection.Resistance R10 is serially connected in sending out of audion VT1
Between the P pole of emitter-base bandgap grading and diode D2.The positive pole of electric capacity C9 is connected with the emitter stage of audion VT1, its negative pole then with transformation
The non-same polarity of the former limit inductance coil L1 of device T is connected.The positive pole of electric capacity C10 is connected with the negative pole of electric capacity C8, its negative pole
Then it is connected with the P pole of diode D1.The N pole of described diode D1 then negative pole with electric capacity C9 is connected.Described transformator T's
The non-same polarity ground connection of former limit inductance coil L2.The negative pole of described electric capacity C9 is also connected with the outfan of overvoltage crowbar.
Described switching signal drive circuit is by audion VT2, field effect transistor MOS, resistance R3, resistance R7, resistance R8, resistance
R6, electric capacity C5 and electric capacity C6 form.
During connection, resistance R3 is serially connected between the base stage of audion VT2 and the outfan of composite buffering circuit.Electric capacity C5's
Positive pole is connected with the P pole of diode D2, its negative pole colelctor electrode with audion VT2 after resistance R7 is connected.Electric capacity C6's
Positive pole is connected with the input of overvoltage crowbar, the drain electrode with field effect transistor MOS after resistance R8 of its negative pole is connected.Electricity
One end of resistance R6 is connected with the source electrode of field effect transistor MOS, its other end ground connection.The emitter stage of described audion VT2 is through resistance
After R5, the negative pole with electric capacity C2 is connected, its colelctor electrode is then connected with the grid of field effect transistor MOS.
Described multiplex output circuit is by the first output circuit being connected with the secondary inductance coil L3 of transformator T, with change
The second output circuit composition that the secondary inductance coil L4 of depressor T is connected.
Wherein, described first output circuit is by manostat U2, diode D3, electric capacity C11, electric capacity C13 and resistance R13 group
Become.
During connection, the P pole of diode D3 is connected with the non-same polarity of the secondary inductance coil L3 of transformator T, its N pole then
It is connected with the IN pin of manostat U2.The positive pole of electric capacity C11 is connected with the N pole of diode D3, its negative pole then with transformator T
The Same Name of Ends of secondary inductance coil L3 be connected.The positive pole of electric capacity C13 is connected with the OUT pin of manostat U2, its negative pole
Then the negative pole with electric capacity C11 is connected.One end of resistance R13 is connected with the positive pole of electric capacity C13, its other end then with electric capacity
The negative pole of C13 is collectively forming the outfan of this first output circuit.The GND pin of described manostat U2 and the negative pole of electric capacity C11
Ground connection while being connected.In order to preferably implement the present invention, this manostat U2 preferred W7806 voltage stabilizing chip.
It addition, described second output circuit is by manostat U3, diode D4, electric capacity C12, electric capacity C14 and resistance R14 group
Become.
During connection, the P pole of diode D4 is connected with the non-same polarity of the secondary inductance coil L4 of transformator T, its N pole then
It is connected with the IN pin of manostat U3.The positive pole of electric capacity C12 is connected with the N pole of diode D4, its negative pole then with transformator T
The Same Name of Ends of secondary inductance coil L4 be connected.The positive pole of electric capacity C14 is connected with the OUT pin of manostat U3, its negative pole
Then the negative pole with electric capacity C12 is connected.One end of resistance R14 is connected with the positive pole of electric capacity C14, its other end then with electric capacity
The negative pole of C14 is collectively forming the outfan of this second output circuit.The GND pin of described manostat U3 and the negative pole of electric capacity C12
Ground connection while being connected.In order to preferably implement the present invention, this manostat U3 preferred W7806 voltage stabilizing chip.
As in figure 2 it is shown, this overvoltage crowbar is by processing chip U4, audion VT3, audion VT4, field effect transistor
MOS1, resistance R15, resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, resistance R21, resistance R22, resistance R23,
Electric capacity C15, electric capacity C16, electric capacity C17, electric capacity C18, diode D5, diode D6, Zener diode D7 and inductance L5 form.
During connection, the positive pole of electric capacity C15 as the input of this overvoltage crowbar and be connected with the positive pole of electric capacity C6,
Its negative pole is then connected with the drain electrode of field effect transistor MOS1.Resistance R15 is serially connected in positive pole and the collection of audion VT3 of electric capacity C15
Between electrode.The P pole of diode D5 is connected with the emitter stage of audion VT3, its N pole then with process chip U4 GND pin
It is connected.The P pole of diode D6 is connected with the positive pole of electric capacity C15, its N pole N with diode D5 after resistance R16 is extremely connected
Connect.Resistance R18 is serially connected between the base stage of audion VT3 and the ON pin processing chip U4.Resistance R19 is serially connected in electric capacity C15
Negative pole and process chip U4 VCC pin between.Resistance R17 is serially connected in TIMER pin and the diode D5 processing chip U4
N pole between.The positive pole of electric capacity C16 is connected with the negative pole of electric capacity C15, its negative pole then with process chip U4 SENSE pin
It is connected.Resistance R20 is serially connected between the grid of field effect transistor MOS1 and the GATE pin processing chip U4.The one of resistance R21
End is connected with the source electrode of field effect transistor MOS1, its other end then after inductance L5 base stage with audion VT4 be connected.Electric capacity
The positive pole of C17 is connected with the grid of field effect transistor MOS1, its negative pole then colelctor electrode with audion VT4 is connected.Resistance R22
It is serially connected between FB pin and the emitter stage of audion VT4 of process chip U4.The N pole of Zener diode D7 and audion VT4
Emitter stage be connected, base P pole is then connected with the N pole of diode D5.The positive pole of electric capacity C18 after resistance R23 with audion
The base stage of VT4 is connected, its negative pole is then connected with the N pole of diode D5.
Meanwhile, the GND pin ground connection of described process chip U4；The junction point of described resistance R21 and inductance L5 then forms this
The outfan of overvoltage crowbar is also connected with the negative pole of electric capacity C9.In order to preferably implement the present invention, described process chip
The integrated chip of the preferred LT1641-2 of U4 realizes.
As it is shown on figure 3, this composite buffering circuit is by audion VT5, audion VT6, field effect transistor MOS2, amplifier P1,
Amplifier P2, amplifier P3, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, resistance R29, resistance R30, electricity
Resistance R31, diode D8, diode D9, electric capacity C19, electric capacity C20 and electric capacity C21 composition.
During connection, one end of resistance R24 is connected with the base stage of audion VT5, its other end is then with control chip U1's
OUT pin is connected.One end of resistance R25 is connected with the colelctor electrode of audion VT5, its other end after resistance R26 with field
The drain electrode of effect pipe MOS2 is connected.The P pole of diode D8 is connected with the emitter stage of audion VT5, its N pole is through resistance R28
It is connected with the source electrode of field effect transistor MOS2 afterwards.Resistance R27 is serially connected in source electrode and the negative pole of amplifier P2 of field effect transistor MOS2
Between.The N pole of diode D9 is connected with the negative pole of amplifier P2, its P pole then outfan with amplifier P1 is connected.Electric capacity
The positive pole of C19 is connected with the positive pole of amplifier P2, its negative pole then outfan with amplifier P2 is connected.Resistance R31 concatenates
Between the outfan and the colelctor electrode of audion VT6 of amplifier P2.Resistance R30 is serially connected in positive pole and the audion of amplifier P3
Between the base stage of VT6.The positive pole of electric capacity C21 is connected with the outfan of amplifier P3, its negative pole then forms this composite buffering electricity
The outfan on road and after resistance R3 base stage with audion VT2 be connected.The negative pole of electric capacity C20 and the transmitting of audion VT6
Pole is connected, its positive pole negative pole with amplifier P1 after resistance R29 is connected.
The described colelctor electrode of audion VT5 is connected with the grid of field effect transistor MOS2.The positive pole of described amplifier P1 with
The N pole of diode D8 is connected, its negative pole and the equal ground connection of outfan.The negative pole of described amplifier P3 and the outfan of amplifier P1
It is connected.
Electromagnetic interference signal can effectively be filtered by the present invention, it is to avoid electromagnetic interference signal affects the steady of the present invention
It is qualitative, so that LED operation is more stable.Meanwhile, the present invention uses the integrated chip of UC3842 to combine peripheral circuit, can go out
When existing overvoltage or instantaneous high current, power supply self and LED lamp are protected, it is to avoid damaged by overvoltage.
As it has been described above, just can well realize the present invention.
Claims (8)
1. overpressure-proof type LED multiple-output electric power based on composite buffering circuit, it is characterised in that the most whole by diode
Stream device U, transformator T, control chip U1, negative pole is connected with the cathode output end of diode rectifier U, positive pole is after resistance R1
The electric capacity C1 being connected with the VFIN pin of control chip U1, positive pole is connected with the cathode output end of diode rectifier U, bears
The electric capacity C7 that pole is sequentially connected with the VCC pin of control chip U1 after electric capacity C4 through resistance R9, is serially connected in the pair of transformator T
Second-order filter circuit between limit inductance coil and diode rectifier U, the overvoltage protection being connected with second-order filter circuit electricity
Road, the switching signal drive circuit being connected with overvoltage crowbar and second-order filter circuit respectively, it is serially connected in control chip U1
OUT pin and switching signal drive circuit between composite buffering circuit, positive pole is connected with the OUT pin of control chip U1
Connect, electric capacity C3 that negative pole is connected with the CS pin of control chip U1 after resistance R2, the RT pin of positive pole and control chip U1
Be connected, electric capacity C2 that negative pole is connected with switching signal drive circuit after resistance R5, be serially connected in the VREF of control chip U1
Resistance R4 between the negative pole of pin and electric capacity C2, and the multiple-channel output electricity being connected with the secondary inductance coil of transformator T
Road forms；The GND pin ground connection of described control chip U1.
Overpressure-proof type LED multiple-output electric power based on composite buffering circuit the most according to claim 1, its feature
Being, described composite buffering circuit, by audion VT5, audion VT6, field effect transistor MOS2, amplifier P1, amplifier P2, is put
Big device P3, the resistance that one end is connected with the base stage of audion VT5, the other end is then connected with the OUT pin of control chip U1
R24, one end is connected with the colelctor electrode of audion VT5, other end drain electrode with field effect transistor MOS2 after resistance R26 is connected
Resistance R25, P pole be connected with the emitter stage of audion VT5, N pole source electrode with field effect transistor MOS2 after resistance R28 is connected
The diode D8 connect, resistance R27, the N pole being serially connected between the source electrode of field effect transistor MOS2 and the negative pole of amplifier P2 and amplification
The diode D9 that the negative pole of device P2 is connected, P pole then outfan with amplifier P1 is connected, the positive pole of positive pole and amplifier P2
Be connected, electric capacity C19 that negative pole then outfan with amplifier P2 is connected, be serially connected in outfan and the audion of amplifier P2
Resistance R31 between the colelctor electrode of VT6, the resistance R30 being serially connected between the positive pole of amplifier P3 and the base stage of audion VT6,
Positive pole is connected with the outfan of amplifier P3, negative pole then forms the electric capacity C21 of outfan of this composite buffering circuit, and negative
The electric capacity C20 group that pole is connected with the emitter stage of audion VT6, positive pole negative pole with amplifier P1 after resistance R29 is connected
Become；The described colelctor electrode of audion VT5 is connected with the grid of field effect transistor MOS2；The positive pole of described amplifier P1 and diode
The N pole of D8 is connected, its negative pole and the equal ground connection of outfan；The negative pole of described amplifier P3 is connected with the outfan of amplifier P1
Connect；The outfan of described composite buffering circuit is then connected with switching signal drive circuit.
Overpressure-proof type LED multiple-output electric power based on composite buffering circuit the most according to claim 2, its feature
Being, described overvoltage crowbar is by processing chip U4, and audion VT3, audion VT4, field effect transistor MOS1, positive pole is as this
The electric capacity C15 that the input of overvoltage crowbar, negative pole are then connected with the drain electrode of field effect transistor MOS1, is serially connected in electric capacity C15
Positive pole and the colelctor electrode of audion VT3 between resistance R15, P pole be connected with the emitter stage of audion VT3, N pole then with place
Diode D5, the P pole that is connected of GND pin of reason chip U4 is connected with the positive pole of electric capacity C15, N pole after resistance R16 with two
The diode D6 that the N pole of pole pipe D5 is connected, is serially connected in the electricity between the base stage of audion VT3 and the ON pin processing chip U4
Resistance R18, is serially connected in the resistance R19 between the negative pole of electric capacity C15 and the VCC pin processing chip U4, is serially connected in process chip U4
TIMER pin and the N pole of diode D5 between resistance R17, positive pole is connected with the negative pole of electric capacity C15, negative pole then with place
The electric capacity C16 that the SENSE pin of reason chip U4 is connected, is serially connected in the grid of field effect transistor MOS1 and processes the GATE of chip U4
Resistance R20 between pin, one end is connected with the source electrode of field effect transistor MOS1, the other end then after inductance L5 with audion
The resistance R21 that the base stage of VT4 is connected, positive pole is connected with the grid of field effect transistor MOS1, negative pole then with the collection of audion VT4
The electric capacity C17 that electrode is connected, is serially connected in the resistance R22 between the FB pin and the emitter stage of audion VT4 that process chip U4,
The Zener diode D7, Yi Jizheng that N pole is connected with the emitter stage of audion VT4, P pole is then connected with the N pole of diode D5
Pole electric capacity C18 group that base stage is connected, negative pole is then connected with the N pole of diode D5 with audion VT4 after resistance R23
Become；The GND pin ground connection of described process chip U4；The junction point of described resistance R21 and inductance L5 then forms this overvoltage protection electricity
The outfan on road is also connected with second-order filter circuit；The input of described overvoltage crowbar then with switching signal drive circuit
It is connected.
Overpressure-proof type LED multiple-output electric power based on composite buffering circuit the most according to claim 3, its feature
Being, described second-order filter circuit by audion VT1, is serially connected in the cathode output end of diode rectifier U and audion VT1
Resistance R11 between base stage, positive pole is connected with the cathode output end of diode rectifier U, negative pole then with the former limit of transformator T
The electric capacity C8 that the Same Name of Ends of inductance coil L1 is connected, is serially connected between the negative pole of electric capacity C8 and the colelctor electrode of audion VT1
Resistance R12, N pole is connected with the Same Name of Ends of the former limit inductance coil L2 of transformator T, the diode D2 of P pole ground connection, is serially connected in three
Resistance R10 between emitter stage and the P pole of diode D2 of pole pipe VT1, positive pole is connected with the emitter stage of audion VT1, bears
The electric capacity C9 that pole then non-same polarity with the former limit inductance coil L1 of transformator T is connected, and the negative pole of positive pole and electric capacity C8
Be connected, the negative pole electric capacity C10 composition that then negative pole with electric capacity C9 is connected after diode D1；The former limit of described transformator T
The non-same polarity ground connection of inductance coil L2；The negative pole of described electric capacity C9 is also connected with the outfan of overvoltage crowbar.
Overpressure-proof type LED multiple-output electric power based on composite buffering circuit the most according to claim 4, its feature
Being, described switching signal drive circuit, by audion VT2, field effect transistor MOS, is serially connected in the base stage of audion VT2 and is combined
Resistance R3 between the outfan of buffer circuit, positive pole is connected with the P pole of diode D2, negative pole after resistance R7 with audion
The electric capacity C5 that the colelctor electrode of VT2 is connected, positive pole is connected with the input of overvoltage crowbar, negative pole after resistance R8 with field
The electric capacity C6 that the drain electrode of effect pipe MOS is connected, and one end is connected with the source electrode of field effect transistor MOS, other end ground connection
Resistance R6 forms；The emitter stage of described audion VT2 negative pole with electric capacity C2 after resistance R5 is connected, its colelctor electrode then with field
The grid of effect pipe MOS is connected.
Overpressure-proof type LED multiple-output electric power based on composite buffering circuit the most according to claim 5, its feature
Being, described multiplex output circuit is by the first output circuit being connected with the secondary inductance coil L3 of transformator T, with transformator
The second output circuit composition that the secondary inductance coil L4 of T is connected；Described first output circuit is by manostat U2, P pole and change
The diode that non-same polarity is connected, N pole is then connected with the IN pin of manostat U2 of the secondary inductance coil L3 of depressor T
D3, positive pole is connected with the N pole of diode D3, negative pole then Same Name of Ends with the secondary inductance coil L3 of transformator T is connected
Electric capacity C11, the electric capacity C13 that positive pole is connected with the OUT pin of manostat U2, negative pole then negative pole with electric capacity C11 is connected, with
And one end is connected with the positive pole of electric capacity C13, the other end is then collectively forming the defeated of this first output circuit with the negative pole of electric capacity C13
Go out the resistance R13 composition of end；The GND pin of described manostat U2 be connected with the negative pole of electric capacity C11 while ground connection.
Overpressure-proof type LED multiple-output electric power based on composite buffering circuit the most according to claim 6, its feature
It is, described second output circuit is connected by the non-same polarity of manostat U3, P pole with the secondary inductance coil L4 of transformator T,
The diode D4 that N pole is then connected with the IN pin of manostat U3, positive pole is connected with the N pole of diode D4, negative pole then with change
The electric capacity C12 that the Same Name of Ends of the secondary inductance coil L4 of depressor T is connected, positive pole is connected with the OUT pin of manostat U3, bears
The electric capacity C14 that pole then negative pole with electric capacity C12 is connected, and one end is connected with the positive pole of electric capacity C14, the other end then with electricity
The resistance R14 of the outfan that the negative pole holding C14 is collectively forming this second output circuit forms；The GND pin of described manostat U3
Ground connection while being connected with the negative pole of electric capacity C12.
Overpressure-proof type LED multiple-output electric power based on composite buffering circuit the most according to claim 7, its feature
Being, described control chip U1 is the integrated chip of UC3842, and described manostat U2 and manostat U3 is W7806 voltage stabilizing chip,
Described process chip U4 is the integrated chip of LT1641-2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610522494.9A CN106211420A (en) | 2016-07-01 | 2016-07-01 | Overpressure-proof type LED multiple-output electric power based on composite buffering circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610522494.9A CN106211420A (en) | 2016-07-01 | 2016-07-01 | Overpressure-proof type LED multiple-output electric power based on composite buffering circuit |
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| CN201610522494.9A Withdrawn CN106211420A (en) | 2016-07-01 | 2016-07-01 | Overpressure-proof type LED multiple-output electric power based on composite buffering circuit |
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| Country | Link |
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| CN (1) | CN106211420A (en) |
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2016
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