CN107733261A - A kind of light-operated LED Switching Power Supply with more processing of circuit - Google Patents
A kind of light-operated LED Switching Power Supply with more processing of circuit Download PDFInfo
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- CN107733261A CN107733261A CN201711047303.9A CN201711047303A CN107733261A CN 107733261 A CN107733261 A CN 107733261A CN 201711047303 A CN201711047303 A CN 201711047303A CN 107733261 A CN107733261 A CN 107733261A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2176—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output
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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
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of light-operated LED Switching Power Supply with more processing of circuit; it is characterized in that; mainly by control chip U2; transformer T; diode rectifier U1; polar capacitor C1; polar capacitor C2; voltage-regulator diode D1; phase adjusting circuit; short-circuit protective circuit of voltage regulation, voltage conditioning output circuit, the over-voltage over-current protection circuit being serially connected between diode rectifier U1 cathode output end and voltage conditioning output circuit and the linear constant current drive circuit composition being connected with voltage conditioning output circuit；The present invention can be to input voltage and electric current pulse dynamic be adjusted, and the present invention can also be adjusted to the intensity of output voltage and electric current, ensure that the stability for the voltage and current that the present invention exports, the stability of light-operated LED (liquid crystal diode) lamp brightness effectively is ensure that, and improves the service life of LED.
Description
Technical field
The present invention relates to a kind of Switching Power Supply, is a kind of light-operated LED switch with more processing of circuit specifically
Power supply.
Background technology
At present, because LED has the characteristics that energy consumption is low, service life is long and safety and environmental protection, it has become people
One of the main product of life lighting.People are realized to LED using acoustic control or light-operated control system more in life
Open and close.Light-operated LED control system can control the unlatching of LED and pass because of it according to the brightness of LED use environment
Close, and can effectively meet requirement of the people to LED in terms of energy-conservation, and enjoy the favor of people.It is however, existing light-operated
There is the problem of output voltage and unstable electric current in LED power, cause the brightness of light-operated LED (liquid crystal diode) lamp unstable, had a strong impact on LED
The service life of lamp.
Therefore it provides a kind of light-operated LED power supply that can export stable voltage and current is the task of top priority.
The content of the invention
It is an object of the invention to overcome, there is output voltage in light-operated LED power supply of the prior art and electric current is unstable
Defect, there is provided a kind of light-operated LED Switching Power Supply with more processing of circuit.
The present invention is achieved through the following technical solutions：A kind of light-operated LED Switching Power Supply with more processing of circuit, mainly
It is connected with diode rectifier U1 cathode output end, born by control chip U2, transformer T, diode rectifier U1, positive pole
The polar capacitor C1 that pole is connected with diode rectifier U1 cathode output end, positive pole are connected with polar capacitor C1 positive pole
Connect, polar capacitor C2, the N pole that negative pole is connected after resistance R1 with polar capacitor C1 negative pole and control chip U2 VIN are managed
The voltage-regulator diode D1 that pin is connected, P poles are connected with diode rectifier U1 cathode output end, is connected with control chip U2
The phase adjusting circuit connect, the phase adjusting circuit being connected with control chip U2, the voltage being connected with control chip U2 are adjusted
Output circuit is managed, the short-circuit protective circuit of voltage regulation being connected respectively with phase adjusting circuit and voltage conditioning output circuit, concatenation
Diode rectifier U1 cathode output end and voltage conditioning output circuit between over-voltage over-current protection circuit, and with electricity
The linear constant current drive circuit composition that pressure conditioning output circuit is connected；The Same Name of Ends of the transformer T secondary inductance coils with
Diode rectifier U1 one of input is connected, another input of its non-same polarity and diode rectifier U1
It is connected；Control chip U2 GND pins ground connection；
The short-circuit protective circuit of voltage regulation is by voltage stabilizing chip U101, triode VT101, triode VT102, one end and three poles
The resistance R101 that pipe VT101 emitter stage is connected, the other end is connected with voltage stabilizing chip U101 IN pins, positive pole and three poles
Pipe VT101 colelctor electrode is connected, the polar capacitor C101 of negative pole ground connection, one end is connected with triode VT101 emitter stage,
Resistance R102, the P pole that the other end is connected with triode VT102 colelctor electrode is connected with triode VT101 base stage, N poles
The diode D101 being connected with triode VT102 base stage, positive pole is connected with triode VT102 base stage, negative pole is through electricity
The polar capacitor C102 that is connected with voltage stabilizing chip U101 GND pins after resistance R104, positive pole is after adjustable resistance R103 with three
The polar capacitor C103 that pole pipe VT102 emitter stage is connected, negative pole is connected with voltage stabilizing chip U101 OUT pins, and
One end is connected with polar capacitor C103 negative pole, the resistance R105 compositions of other end ground connection；The transmitting of the triode VT101
Pole is connected with phase adjusting circuit, and triode VT101 colelctor electrode is connected with voltage stabilizing chip U101 IN pins；It is described
Voltage stabilizing chip U101 GND pins ground connection, voltage stabilizing chip U101 OUT pins are connected with voltage conditioning output circuit.
The over-voltage over-current protection circuit is by triode VT5, triode VT6, FET MOS2, negative pole and triode
The polar capacitor that VT5 colelctor electrode is connected, positive pole is connected after resistance R21 with diode rectifier U1 cathode output end
C13, P pole are connected after resistance R22 with polar capacitor C13 positive pole, base stage phase of the N poles after resistance R24 with triode VT5
Diode D9, the N pole of connection is connected after resistance R26 with FET MOS2 grid, P poles after resistance R23 with polarity
The diode D10 that electric capacity C13 positive pole is connected, one end is connected with FET MOS2 drain electrode, the other end and diode
The adjustable resistance R25 that D10 P poles are connected, positive pole is connected after resistance R28 with diode D9 N poles, negative pole is through resistance
Polar capacitor C14, the P pole being connected after R27 with triode VT5 emitter stage is connected with triode VT6 emitter stage, N poles
The diode D11 being connected with FET MOS2 drain electrode, colelctor electrode of the positive pole after adjustable resistance R29 with triode VT6
It is connected, the polar capacitor C16 of negative pole ground connection, and positive pole is connected with triode VT6 base stage, negative pole and adjustable resistance
The polar capacitor C15 compositions that R29 adjustable end is connected；The positive pole of the polar capacitor C14 and triode VT6 colelctor electrode phase
Connection, its negative pole are connected with FET MOS2 source electrode；The P poles ground connection of the diode D9；The collection of the triode VT6
Electrode as over-voltage over-current protection circuit output end and with voltage conditioning output circuit be connected.
The linear constant current drive circuit is by driving chip U3, triode VT4, positive pole after resistance R13 with driving chip
U3 IN pins are connected, negative pole as linear constant current drive circuit input and be connected with voltage conditioning output circuit
Polar capacitor C9, P pole is connected after resistance R14 with driving chip U3 BOOST pins, N poles after resistance R25 with drive core
The diode D6 that piece U3 SW pins are connected, negative pole is connected after resistance R16 with diode D6 P poles, positive pole and two seasons
Polar capacitor C11, the P pole that the N poles of degree 6 are connected is connected with polar capacitor C11 positive pole, N poles drive as linear constant current
The voltage-regulator diode D7 of the output end of circuit, one end is connected with polar capacitor C11 positive pole, the other end and diode D6 N
The resistance R17 that pole is connected, positive pole is connected after resistance R18 with driving chip U3 FB pins, negative pole and triode VT4
The polar capacitor C12 that base stage is connected, positive pole is connected with driving chip U3 FB pins, the polar capacitor C10 of negative pole ground connection,
And N poles are connected after resistance R19 with polar capacitor C10 negative pole, emitter stage of the P poles after resistance R20 with triode VT4
The diode D8 compositions being connected；The N poles ground connection of the diode D6；The EN pins of the driving chip U3 and polar capacitor C9
Positive pole be connected, its GND pin ground connection；The grounded collector of the triode VT4, its emitter stage are with voltage-regulator diode D7's
N poles are connected.
The phase adjusting circuit is by triode VT1, triode VT2, SS of the positive pole after resistance R1 with control chip U2
Polar capacitor C3, the P pole that pin is connected, negative pole is connected with triode VT1 emitter stage and control chip U2 SIN pins
It is connected, the diode D2 that N poles are connected with triode VT1 colelctor electrode, COC of the positive pole after resistance R4 with control chip U2
The polar capacitor C4 that pin is connected, negative pole is connected after resistance R3 with triode VT1 emitter stage, negative pole and control chip
The polar capacitor C5 that U2 FC pins are connected, positive pole is connected after resistance R5 with triode VT2 colelctor electrode, and N poles
It is connected after resistance R7 with control chip U2 CR pins, P poles are connected after resistance R6 with triode VT2 emitter stage
Diode D3 is formed；The N poles of the diode D3 are connected with control chip U2 SHDN pins, its P pole and triode VT101
Emitter stage be connected；The base stage of the triode VT2 is connected with triode VT1 base stage, its emitter stage and polar capacitor
C4 negative pole is grounded after being connected；The positive pole of the polar capacitor C4 is connected with triode VT1 base stage.
Voltage conditioning output circuit is by FET MOS1, triode VT3, positive pole after resistance R8 with triode
The polar capacitor C6 that VT3 emitter stage is connected, negative pole is connected with triode VT6 colelctor electrode, one end and FET MOS
Drain electrode be connected, the adjustable resistance R12 that the other end is connected with voltage stabilizing chip U101OUT pins, one end and polar capacitor C6
Positive pole be connected, inductance L2, N pole that the other end is connected with voltage stabilizing chip U101 OUT pins is imitated after resistance R10 with field
Should pipe MOS1 source electrode be connected, the diode D4 that P poles are connected with triode VT3 base stage, negative pole and triode VT3 collection
The polar capacitor C7 that electrode is connected, positive pole is connected with FET MOS1 grid, and positive pole sequentially through resistance R9 and
It is connected after inductance L1 with control chip U2 FB pins, negative pole is connected after resistance R11 with adjustable resistance R12 adjustable end
Polar capacitor C8 composition；The N poles of the voltage-regulator diode D5 are connected with polar capacitor C6 negative pole；The FET
The negative pole that MOS1 grid is connected with control chip U2 VOUT pins and PWM pins respectively, it drains with polar capacitor C9
It is connected.
For the practical effect of the present invention, the control chip U2 is then preferentially realized using L296 integrated chips；
The driving chip U3 then preferentially employs LM2734X integrated chips to realize simultaneously；The voltage stabilizing chip U101 is 7805ABT
Integrated chip.
The present invention compared with prior art, has advantages below and beneficial effect：
(1) the pulse dynamic that the present invention can be to input voltage and electric current is adjusted, and the present invention can also be to output electricity
Pressure and the intensity of electric current are adjusted, and are ensured that the stability for the voltage and current that the present invention exports, effectively be ensure that
The stability of light-operated LED (liquid crystal diode) lamp brightness, and improve the service life of LED.
(2) the short-circuit protective circuit of voltage regulation that the present invention is set can be in the instant high-voltage or electricity that the short circuit of this source element occurs
Stream is suppressed；And voltage to passing through can be combined with its peripheral electronic component by the voltage stabilizing chip set by the circuit
Quickly it is depressured, while timely blocks this power supply, so as to effectively ensure that the load of Switching Power Supply will not be damaged.
(3) present invention can suppress to the high voltage and high current of input, effectively eliminate high voltage and high current
Impact, so as to improve the stability of voltage and current that the present invention exports, be effectively prevented LED by high voltage and height
Circuit damage.
(4) present invention can export stable driving voltage and electric current, make output voltage and electric current and reference voltage and electric current
Unanimously, the stable voltage and current of present invention output is ensured that.
(5) control chip U of the invention is realized using L296 integrated chips, and the chip is combined with external circuit
Effectively raise the stability and reliability of output voltage and electric current of the present invention.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the present invention.
Fig. 2 is the electrical block diagram of the linear constant current drive circuit of the present invention.
Fig. 3 is the electrical block diagram of the over-voltage over-current protection circuit of the present invention.
Fig. 4 is the electrical block diagram of the short-circuit protective circuit of voltage regulation of the present invention.
Embodiment
The present invention is described in further detail with reference to embodiment and its accompanying drawing, but embodiments of the present invention are not
It is limited to this.
Embodiment
As shown in figure 1, the present invention is mainly by control chip U2, transformer T, diode rectifier U1, polar capacitor C1, pole
Property electric capacity C2, voltage-regulator diode D1, over-voltage over-current protection circuit, linear constant current drive circuit, short-circuit protective circuit of voltage regulation, pulse
Adjustment circuit, and voltage conditioning output circuit composition.
During connection, polar capacitor C1 positive pole is connected with diode rectifier U1 cathode output end, its negative pole and two
Pole pipe rectifier U1 cathode output end is connected.Polar capacitor C2 positive pole is connected with polar capacitor C1 positive pole, negative pole
Negative pole with polar capacitor C1 after resistance R1 is connected.Voltage-regulator diode D1 N poles are connected with control chip U2 VIN pins
Connect, its P pole is connected with diode rectifier U1 cathode output end.Phase adjusting circuit is connected with control chip U2.Electricity
Pressure conditioning output circuit is connected with control chip U2 and diode rectifier U1 respectively.Short-circuit protective circuit of voltage regulation respectively with arteries and veins
Adjustment circuit is rushed with voltage conditioning output circuit to be connected.Over-voltage over-current protection circuit is serially connected in diode rectifier U1 negative pole
Between output end and voltage conditioning output circuit.Linear constant current drive circuit is connected with voltage conditioning output circuit.
The Same Name of Ends of the transformer T secondary inductance coils is connected with diode rectifier U1 one of input
Connect, its non-same polarity is connected with diode rectifier U1 another input；Control chip U2 GND pins ground connection；Institute
The Same Name of Ends and non-same polarity for stating transformer T primary side inductance coils are connected with external power source respectively.
Wherein, the phase adjusting circuit is by triode VT1, triode VT2, resistance R2, resistance R3, resistance R4, resistance
R5, resistance R6, resistance R7, polar capacitor C3, polar capacitor C4, polar capacitor C5, diode D2, and diode D3 compositions.
During connection, polar capacitor C3 positive pole is connected after resistance R1 with control chip U2 SS pins, its negative pole with
Triode VT1 emitter stage is connected.Diode D2 P poles are connected with control chip U2 SIN pins, its N pole and three poles
Pipe VT1 colelctor electrode is connected.Polar capacitor C4 positive pole is connected after resistance R4 with control chip U2 COC pins, it
Emitter stage of the negative pole with triode VT1 after resistance R3 is connected.Polar capacitor C5 negative pole and control chip U2 FC pins
It is connected, colelctor electrode of its positive pole with triode VT2 after resistance R5 is connected.Diode D3 N poles after resistance R7 with control
Coremaking piece U2 CR pins are connected, its emitter stage of P poles with triode VT2 after resistance R6 is connected.
The N poles of the diode D3 are connected with control chip U2 SHDN pins, its P pole and triode VT101 hair
Emitter-base bandgap grading is connected；The base stage of the triode VT2 is connected with triode VT1 base stage, its emitter stage is with polar capacitor C4's
Negative pole is grounded after being connected；The positive pole of the polar capacitor C4 is connected with triode VT1 base stage.
Further, voltage conditioning output circuit is by FET MOS1, triode VT3, resistance R8, resistance R9,
Resistance R10, resistance R11, adjustable resistance R12, polar capacitor C6, polar capacitor C7, polar capacitor C8, diode D4, Yi Ji electricity
Feel L2 compositions.
During connection, polar capacitor C6 positive pole is connected after resistance R8 with triode VT3 emitter stage, its negative pole and three
Pole pipe VT6 colelctor electrode is connected.Adjustable resistance R12 one end is connected with FET MOS drain electrode, the other end and voltage stabilizing
Chip U101OUT pins are connected.Inductance L2 one end is connected with polar capacitor C6 positive pole, its other end and voltage stabilizing chip
U101 OUT pins are connected.
Meanwhile diode D4 N poles are connected after resistance R10 with FET MOS1 source electrode, its P pole and triode
VT3 base stage is connected.Polar capacitor C7 negative pole is connected with triode VT3 colelctor electrode, its positive pole and FET
MOS1 grid is connected.Polar capacitor C8 positive pole sequentially FB pin phases after resistance R9 and inductance L1 with control chip U2
Connection, its negative pole are connected after resistance R11 with adjustable resistance R12 adjustable end.
The N poles of the voltage-regulator diode D5 are connected with polar capacitor C6 negative pole；The grid of the FET MOS1
It is connected respectively with control chip U2 VOUT pins and PWM pins, its drain electrode is connected with polar capacitor C9 negative pole.
As shown in Fig. 2 the linear constant current drive circuit is by driving chip U3, triode VT4, resistance R13, resistance R14,
Resistance R15, resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, polar capacitor C9, polar capacitor C10, polarity electricity
Hold C11, polar capacitor C12, diode D6, voltage-regulator diode D7, and diode D8 composition.
During connection, polar capacitor C9 positive pole is connected after resistance R13 with driving chip U3 IN pins, its negative pole is made
Input for linear constant current drive circuit is simultaneously connected with voltage conditioning output circuit.Diode D6 P poles are after resistance R14
It is connected with driving chip U3 BOOST pins, its N pole is connected after resistance R25 with driving chip U3 SW pins.Polarity
Electric capacity C11 negative pole is connected after resistance R16 with diode D6 P poles, its positive pole is connected with for the second quarter 6 N poles.Voltage stabilizing
Diode D7 P poles are connected with polar capacitor C11 positive pole, its output end of N poles as linear constant current drive circuit, and this is defeated
The output end for going out end with voltage conditioning output circuit is connected with LED respectively.
Meanwhile resistance R17 one end is connected with polar capacitor C11 positive pole, the N poles phase of its other end and diode D6
Connection.Polar capacitor C12 positive pole is connected after resistance R18 with driving chip U3 FB pins, its negative pole and triode VT4
Base stage be connected.Polar capacitor C10 positive pole is connected with driving chip U3 FB pins, its negative pole ground connection.Diode D8
N poles be connected after resistance R19 with polar capacitor C10 negative pole, its emitter stage of P poles after resistance R20 with triode VT4
It is connected.
The N poles ground connection of the diode D6；The EN pins of the driving chip U3 are connected with polar capacitor C9 positive pole,
Its GND pin is grounded；The grounded collector of the triode VT4, its emitter stage are connected with voltage-regulator diode D7 N poles.
As shown in figure 3, the over-voltage over-current protection circuit is by triode VT5, triode VT6, FET MOS2, resistance
R21, resistance R22, resistance R23, resistance R24, adjustable resistance R25, resistance R26, resistance R27, resistance R28, adjustable resistance R29,
Polar capacitor C13, polar capacitor C14, polar capacitor C15, polar capacitor C16, diode D9, diode D10, and diode
D11 is formed.
During connection, polar capacitor C13 negative pole is connected with triode VT5 colelctor electrode, its positive pole after resistance R21 with
Diode rectifier U1 cathode output end is connected.Positive pole of the diode D9 P poles after resistance R22 with polar capacitor C13
It is connected, its base stage of N poles with triode VT5 after resistance R24 is connected.Diode D10 N poles after resistance R26 with field
Effect pipe MOS2 grid is connected, its positive pole of P poles with polar capacitor C13 after resistance R23 is connected.
Meanwhile adjustable resistance R25 one end is connected with FET MOS2 drain electrode, its other end and diode D10
P poles be connected.Polar capacitor C14 positive pole is connected after resistance R28 with diode D9 N poles, its negative pole is through resistance R27
The emitter stage with triode VT5 is connected afterwards.Diode D11 P poles are connected with triode VT6 emitter stage, its N pole and field
Effect pipe MOS2 drain electrode is connected.Colelctor electrode phase of the polar capacitor C16 positive pole after adjustable resistance R29 with triode VT6
Connection, its negative pole ground connection.Polar capacitor C15 positive pole is connected with triode VT6 base stage, its negative pole and adjustable resistance R29
Adjustable end be connected.
The positive pole of the polar capacitor C14 is connected with triode VT6 colelctor electrode, its negative pole is with FET MOS2's
Source electrode is connected；The P poles ground connection of the diode D9；The colelctor electrode of the triode VT6 is as over-voltage over-current protection circuit
Output end is simultaneously connected with voltage conditioning output circuit.
As shown in figure 4, the short-circuit protective circuit of voltage regulation is by voltage stabilizing chip U101, triode VT101, triode VT102,
Resistance R101, resistance R102, adjustable resistance R103, resistance R104, resistance R105, polar capacitor C101, polar capacitor C102, pole
Property electric capacity C103, and diode D101 composition.
During connection, resistance R101 one end is connected with triode VT101 emitter stage, the other end and voltage stabilizing chip U101
IN pins be connected.Polar capacitor C101 positive pole is connected with triode VT101 colelctor electrode, negative pole ground connection.Resistance
R102 one end is connected with triode VT101 emitter stage, the other end is connected with triode VT102 colelctor electrode.Two poles
Pipe D101 P poles are connected with triode VT101 base stage, N poles are connected with triode VT102 base stage.
Wherein, polar capacitor C102 positive pole be connected with triode VT102 base stage, negative pole after resistance R104 with it is steady
Pressure chip U101 GND pins are connected.Hair of the polar capacitor C103 positive pole after adjustable resistance R103 with triode VT102
Emitter-base bandgap grading is connected, negative pole is connected with voltage stabilizing chip U101 OUT pins.Resistance R105 one end is negative with polar capacitor C103's
Pole is connected, the other end is grounded.
The emitter stage of the triode VT101 is connected with phase adjusting circuit, triode VT101 colelctor electrode with it is steady
Pressure chip U101 IN pins are connected；The GND pins ground connection of the voltage stabilizing chip U101, voltage stabilizing chip U101 OUT pipes
Pin is connected with voltage conditioning output circuit.The voltage stabilizing chip U101 then preferentially employs 7805ABT integrated chips to realize.
The circuit operationally, when there is short circuit in this Switching Power Supply and voltage instantaneous raises, resistance R101 and polar capacitor C101 shapes
Into current limiter then can to electric current carry out quickly discharge over the ground, triode VT101 is now in cut-off state, and electric current is through voltage stabilizing
Triode is flowed to by the polar capacitor C103 and adjustable resistance R103 feedback channels formed after chip U101 progress voltage stabilizings
VT102, raise the level on triode VT102 emitter stage, triode VT102 cut-offs, this Switching Power Supply stops output electricity
Pressure, its Switching Power Supply are in power failure state, it is therefore prevented that load is damaged by the voltage.
During operation, the pulse dynamic that the present invention can be to input voltage and electric current is adjusted, and the present invention can also be to defeated
The intensity for going out voltage and current is adjusted.And the short-circuit protective circuit of voltage regulation that the present invention is set can be in the short circuit of this source element
The instant high-voltage or electric current of appearance are suppressed；And the electronics member peripheral with it of the voltage stabilizing chip set by the circuit can be passed through
Part is combined quickly to be depressured to the voltage passed through, while timely blocks this power supply, ensures that output of the present invention
Voltage and current stability, effectively ensure that the stability of light-operated LED (liquid crystal diode) lamp brightness, and improve the use of LED
Life-span.The present invention can suppress to the high voltage and high current of input, effectively eliminate the impact of high voltage and high current,
So as to improve the stability for the voltage and current that the present invention exports, it is effectively prevented LED and is damaged by high voltage and high current
It is bad.
Meanwhile the present invention can export stable driving voltage and electric current, make output voltage and electric current and reference voltage and electricity
Stream is consistent, ensures that the stable voltage and current of present invention output.The control chip U of the present invention uses L296 integrated chips
To realize, the chip has the functions such as overtemperature protection and short-circuit protection, and the chip is combined with external circuit and effectively carried
The high stability and reliability of output voltage and electric current of the present invention.For the practical effect of the present invention, described driving
Chip U3 then preferentially employs the LM2734X integrated chips of stable performance to realize.
According to above-described embodiment, you can realize the present invention well.
Claims (7)
1. a kind of light-operated LED Switching Power Supply with more processing of circuit, it is characterised in that mainly by control chip U2, transformer
T, diode rectifier U1, positive pole is connected with diode rectifier U1 cathode output end, negative pole and diode rectifier U1
The polar capacitor C1 that is connected of cathode output end, positive pole is connected with polar capacitor C1 positive pole, negative pole after resistance R1 with
Polar capacitor C2, the N pole that polar capacitor C1 negative pole is connected is connected with control chip U2 VIN pins, P poles and diode
The voltage-regulator diode D1 that rectifier U1 cathode output end is connected, the phase adjusting circuit being connected with control chip U2, with
The phase adjusting circuit that control chip U2 is connected, be connected with control chip U2 voltage conditioning output circuit, respectively with arteries and veins
The short-circuit protective circuit of voltage regulation that adjustment circuit is connected with voltage conditioning output circuit is rushed, is serially connected in the negative of diode rectifier U1
Over-voltage over-current protection circuit between pole output end and voltage conditioning output circuit, and be connected with voltage conditioning output circuit
Linear constant current drive circuit composition；The Same Name of Ends and diode rectifier U1 of the transformer T secondary inductance coils are wherein
One input is connected, its non-same polarity is connected with diode rectifier U1 another input；Control chip U2's
GND pins are grounded；
The short-circuit protective circuit of voltage regulation is by voltage stabilizing chip U101, triode VT101, triode VT102, one end and triode
The resistance R101 that VT101 emitter stage is connected, the other end is connected with voltage stabilizing chip U101 IN pins, positive pole and triode
VT101 colelctor electrode is connected, the polar capacitor C101 of negative pole ground connection, and one end is connected, separately with triode VT101 emitter stage
Resistance R102, the P pole that one end is connected with triode VT102 colelctor electrode is connected with triode VT101 base stage, N poles with
The diode D101 that triode VT102 base stage is connected, positive pole is connected with triode VT102 base stage, negative pole is through resistance
The polar capacitor C102 being connected after R104 with voltage stabilizing chip U101 GND pins, positive pole after adjustable resistance R103 with three poles
The polar capacitor C103, Yi Jiyi that pipe VT102 emitter stage is connected, negative pole is connected with voltage stabilizing chip U101 OUT pins
End is connected with polar capacitor C103 negative pole, the resistance R105 compositions of other end ground connection；The emitter stage of the triode VT101
It is connected with phase adjusting circuit, triode VT101 colelctor electrode is connected with voltage stabilizing chip U101 IN pins；It is described steady
Chip U101 GND pins ground connection is pressed, voltage stabilizing chip U101 OUT pins are connected with voltage conditioning output circuit.
2. a kind of light-operated LED Switching Power Supply with more processing of circuit according to claim 1, it is characterised in that described
Over-voltage over-current protection circuit is by triode VT5, triode VT6, FET MOS2, the colelctor electrode phase of negative pole and triode VT5
Polar capacitor C13, the P poles that connection, positive pole are connected after resistance R21 with diode rectifier U1 cathode output end are through resistance
It is connected after R22 with polar capacitor C13 positive pole, the diode that N poles are connected after resistance R24 with triode VT5 base stage
D9, N pole are connected after resistance R26 with FET MOS2 grid, positive pole of the P poles after resistance R23 with polar capacitor C13
The diode D10 being connected, one end is connected with FET MOS2 drain electrode, the other end is connected with diode D10 P poles
Adjustable resistance R25, positive pole is connected after resistance R28 with diode D9 N poles, negative pole after resistance R27 with triode VT5
Polar capacitor C14, the P pole that is connected of emitter stage be connected with triode VT6 emitter stage, N poles are with FET MOS2's
Drain the diode D11 being connected, and positive pole is connected after adjustable resistance R29 with triode VT6 colelctor electrode, negative pole is grounded
Polar capacitor C16, and positive pole is connected with triode VT6 base stage, negative pole is connected with adjustable resistance R29 adjustable end
Polar capacitor C15 is formed；The positive pole of the polar capacitor C14 is connected with triode VT6 colelctor electrode, its negative pole and field-effect
Pipe MOS2 source electrode is connected；The P poles ground connection of the diode D9；The colelctor electrode of the triode VT6 is protected as over-voltage and over-current
The output end of protection circuit is simultaneously connected with voltage conditioning output circuit.
3. a kind of light-operated LED Switching Power Supply with more processing of circuit according to claim 2, it is characterised in that described
Linear constant current drive circuit is by driving chip U3, triode VT4, IN pin phase of the positive pole after resistance R13 with driving chip U3
Connection, negative pole as linear constant current drive circuit input and nurse one's health the output circuit polar capacitor C9, P that are connected with voltage
Pole is connected after resistance R14 with driving chip U3 BOOST pins, SW pin of the N poles after resistance R25 with driving chip U3
The diode D6 being connected, negative pole is connected after resistance R16 with diode D6 P poles, positive pole is extremely connected with for the second quarter 6 N
Polar capacitor C11, the P pole connect is connected with polar capacitor C11 positive pole, output end of the N poles as linear constant current drive circuit
Voltage-regulator diode D7, the electricity that one end is connected with polar capacitor C11 positive pole, the other end is connected with diode D6 N poles
R17 is hindered, positive pole is connected after resistance R18 with driving chip U3 FB pins, negative pole is connected with triode VT4 base stage
Polar capacitor C12, positive pole is connected with driving chip U3 FB pins, the polar capacitor C10 of negative pole ground connection, and N poles are through electricity
It is connected after resistance R19 with polar capacitor C10 negative pole, two that P poles are connected after resistance R20 with triode VT4 emitter stage
Pole pipe D8 is formed；The N poles ground connection of the diode D6；The EN pins of the driving chip U3 are connected with polar capacitor C9 positive pole
Connect, its GND pin ground connection；The grounded collector of the triode VT4, its emitter stage are connected with voltage-regulator diode D7 N poles.
4. a kind of light-operated LED Switching Power Supply with more processing of circuit according to claim 3, it is characterised in that described
Phase adjusting circuit is connected with control chip U2 SS pins after resistance R1, born by triode VT1, triode VT2, positive pole
Polar capacitor C3, the P pole that pole is connected with triode VT1 emitter stage is connected with control chip U2 SIN pins, N poles with
The diode D2 that triode VT1 colelctor electrode is connected, positive pole is connected after resistance R4 with control chip U2 COC pins,
The polar capacitor C4 that negative pole is connected after resistance R3 with triode VT1 emitter stage, the FC pins of negative pole and control chip U2
It is connected, the polar capacitor C5 that positive pole is connected after resistance R5 with triode VT2 colelctor electrode, and N poles are after resistance R7
It is connected with control chip U2 CR pins, the diode D3 groups that P poles are connected after resistance R6 with triode VT2 emitter stage
Into；The N poles of the diode D3 are connected with control chip U2 SHDN pins, its P pole and triode VT101 emitter stage phase
Connection；The base stage of the triode VT2 is connected with triode VT1 base stage, the negative pole phase of its emitter stage and polar capacitor C4
It is grounded after connection；The positive pole of the polar capacitor C4 is connected with triode VT1 base stage.
5. a kind of light-operated LED Switching Power Supply with more processing of circuit according to claim 4, it is characterised in that described
Voltage nurses one's health output circuit by FET MOS1, triode VT3, emitter stage phase of the positive pole after resistance R8 with triode VT3
Connection, the polar capacitor C6 that is connected with triode VT6 colelctor electrode of negative pole, one end is connected with FET MOS drain electrode,
The adjustable resistance R12 that the other end is connected with voltage stabilizing chip U101OUT pins, one end is connected with polar capacitor C6 positive pole,
Source of inductance L2, the N pole that the other end is connected with voltage stabilizing chip U101 OUT pins after resistance R10 with FET MOS1
The diode D4 that pole is connected, P poles are connected with triode VT3 base stage, negative pole is connected with triode VT3 colelctor electrode,
The polar capacitor C7 that positive pole is connected with FET MOS1 grid, and positive pole sequentially after resistance R9 and inductance L1 with control
The polar capacitor C8 that coremaking piece U2 FB pins are connected, negative pole is connected after resistance R11 with adjustable resistance R12 adjustable end
Composition；The N poles of the voltage-regulator diode D5 are connected with polar capacitor C6 negative pole；The grid difference of the FET MOS1
It is connected with control chip U2 VOUT pins and PWM pins, its drain electrode is connected with polar capacitor C9 negative pole.
6. a kind of light-operated LED Switching Power Supply with more processing of circuit according to claim 5, it is characterised in that described
Control chip U2 is L296 integrated chips.
7. a kind of light-operated LED Switching Power Supply with more processing of circuit according to claim 5, it is characterised in that described
Driving chip U3 is LM2734X integrated chips；The voltage stabilizing chip U101 is 7805ABT integrated chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711047303.9A CN107733261A (en) | 2017-10-31 | 2017-10-31 | A kind of light-operated LED Switching Power Supply with more processing of circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711047303.9A CN107733261A (en) | 2017-10-31 | 2017-10-31 | A kind of light-operated LED Switching Power Supply with more processing of circuit |
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| Publication Number | Publication Date |
|---|---|
| CN107733261A true CN107733261A (en) | 2018-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711047303.9A Pending CN107733261A (en) | 2017-10-31 | 2017-10-31 | A kind of light-operated LED Switching Power Supply with more processing of circuit |
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| Country | Link |
|---|---|
| CN (1) | CN107733261A (en) |
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2017
- 2017-10-31 CN CN201711047303.9A patent/CN107733261A/en active Pending
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