CN107734753A - A kind of base has the light-operated LED pair protection formula Switching Power Supplies of constant current driving processing - Google Patents
A kind of base has the light-operated LED pair protection formula Switching Power Supplies of constant current driving processing Download PDFInfo
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- CN107734753A CN107734753A CN201711047305.8A CN201711047305A CN107734753A CN 107734753 A CN107734753 A CN 107734753A CN 201711047305 A CN201711047305 A CN 201711047305A CN 107734753 A CN107734753 A CN 107734753A
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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]
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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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/105—Controlling the light source in response to determined parameters
- H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light
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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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- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses the light-operated LED pair protection formula Switching Power Supplies that a kind of base has constant current driving processing; it is characterized in that; mainly by control chip U2; short-circuit protective circuit of voltage regulation; transformer T; diode rectifier U1; polar capacitor C1; polar capacitor C2; voltage-regulator diode D1; the phase adjusting circuit being connected with control chip U2, the voltage conditioning output circuit being connected respectively with control chip U2 and diode rectifier U1, and formed with the linear constant current drive circuit that voltage conditioning output circuit is connected；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 that the light-operated LED that a kind of base has constant current driving processing is used specifically
Double protection formula Switching Power Supplies.
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 base have the double protection formula Switching Power Supplies of the light-operated LED of constant current driving processing.
The present invention is achieved through the following technical solutions：A kind of base has the light-operated LED pair protection formulas of constant current driving processing
Switching Power Supply, it is mainly defeated by control chip U2, transformer T, diode rectifier U1, the positive pole of positive pole and diode rectifier U1
Go out end be connected, the polar capacitor C1 that negative pole is connected with diode rectifier U1 cathode output end, positive pole and polar capacitor
Polar capacitor C2, the N pole that C1 positive pole is connected, negative pole is connected after resistance R1 with polar capacitor C1 negative pole and control core
The voltage-regulator diode D1 that piece U2 VIN pins are connected, P poles are connected with diode rectifier U1 cathode output end, with control
The phase adjusting circuit that coremaking piece U2 is connected, the voltage conditioning being connected respectively with control chip U2 and diode rectifier U1
Output circuit, the short-circuit protective circuit of voltage regulation being connected respectively with phase adjusting circuit and voltage conditioning output circuit, Yi Jiyu
The linear constant current drive circuit composition that voltage conditioning output circuit is connected；The Same Name of Ends of the transformer T secondary inductance coils
It is connected with diode rectifier U1 one of input, another input of its non-same polarity and diode rectifier U1
End 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 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 MOS, triode VT3, positive pole after resistance R8 with triode VT3
Emitter stage be connected, the polar capacitor C6 that negative pole is connected with diode rectifier U1 cathode output end, one end and field are imitated
Should pipe MOS drain electrode be connected, the adjustable resistance R12 that the other end is connected with voltage stabilizing chip U101OUT pins, one end and polarity
Inductance L2, the N pole that electric capacity C6 positive pole is connected, the other end is connected with voltage stabilizing chip U101 OUT pins is after resistance R10
It is connected with FET MOS source electrode, the diode D4 that P poles are connected with triode VT3 base stage, negative pole and triode
The polar capacitor C7 that VT3 colelctor electrode is connected, positive pole is connected with FET MOS grid, and positive pole is sequentially through electricity
It is connected after resistance R9 and inductance L1 with control chip U2 FB pins, adjustable end of the negative pole after resistance R11 with adjustable resistance R12
The polar capacitor C8 compositions being connected；The grid of the FET MOS is managed with control chip U2 VOUT pins and PWM respectively
Pin is connected, its drain electrode is connected with polar capacitor C9 negative pole.
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 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.
(4) 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 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, short-circuit protective circuit of voltage regulation, diode rectification
Device U1, polar capacitor C1, polar capacitor C2, voltage-regulator diode D1, linear constant current drive circuit, phase adjusting circuit, Yi Ji electricity
Pressure 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.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, the voltage conditioning output circuit is by FET MOS, triode VT3, resistance R8, resistance R9, electricity
Hinder R10, resistance R11, adjustable resistance R12, polar capacitor C6, polar capacitor C7, polar capacitor C8, diode D4, and inductance
L2 is formed.
During connection, polar capacitor C6 positive pole is connected after resistance R8 with triode VT3 emitter stage, its negative pole and two
Pole pipe rectifier U1 cathode output end is connected.Adjustable resistance R12 one end is connected, separately with FET MOS drain electrode
One end is connected with voltage stabilizing chip U101OUT pins.Inductance L2 one end is connected with polar capacitor C6 positive pole, its other end
It is connected with voltage stabilizing chip U101 OUT pins.
Meanwhile diode D4 N poles are connected after resistance R10 with FET MOS 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 MOS
Grid be connected.Polar capacitor C8 positive pole is sequentially connected after resistance R9 and inductance L1 with control chip U2 FB pins
Connect, its negative pole is connected after resistance R11 with adjustable resistance R12 adjustable end.
The grid of the FET MOS is connected with control chip U2 VOUT pins and PWM pins respectively, its drain electrode
It 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 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.
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, and the chip with external circuit be combined effectively raise output voltage and electric current of the present invention stability and can
By property.For the practical effect of the present invention, described driving chip U3 then preferentially employs the LM2734X collection of stable performance
Realized into chip.
According to above-described embodiment, you can realize the present invention well.
Claims (6)
1. a kind of base has the light-operated LED pair protection formula Switching Power Supplies of constant current driving processing, it is characterised in that mainly by control core
Piece U2, transformer T, diode rectifier U1, positive pole is connected with diode rectifier U1 cathode output end, negative pole and two poles
The polar capacitor C1 that pipe rectifier U1 cathode output end is connected, positive pole is connected with polar capacitor C1 positive pole, negative pole warp
Polar capacitor C2, the N pole being connected after resistance R1 with polar capacitor C1 negative pole is connected with control chip U2 VIN pins, P
The voltage-regulator diode D1 that pole is connected with diode rectifier U1 cathode output end, the pulse being connected with control chip U2 are adjusted
Whole circuit, the voltage conditioning output circuit being connected respectively with control chip U2 and diode rectifier U1, is adjusted with pulse respectively
The short-circuit protective circuit of voltage regulation that whole circuit is connected with 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 base according to claim 1 has the light-operated LED pair protection formula Switching Power Supplies of constant current driving processing, it is special
Sign is, the linear constant current drive circuit is by driving chip U3, triode VT4, positive pole after resistance R13 with driving chip U3
IN pins be connected, negative pole as linear constant current drive circuit input and with the pole that is connected of voltage conditioning output circuit
Property electric capacity C9, P poles are connected after resistance R14 with driving chip U3 BOOST pins, N poles after resistance R25 with driving chip
The diode D6 that U3 SW pins are connected, negative pole is connected after resistance R16 with diode D6 P poles, positive pole and for the second quarter 6
Polar capacitor C11, the P pole that is connected of N poles be connected with polar capacitor C11 positive pole, N poles are as linear constant current drive circuit
Output end voltage-regulator diode D7, one end is connected with polar capacitor C11 positive pole, the other end and diode D6 N poles phase
The resistance R17 of connection, positive pole is connected after resistance R18 with driving chip U3 FB pins, negative pole and triode VT4 base stage
The polar capacitor C12 being 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 with triode VT4 after resistance R20 is connected
The diode D8 compositions connect；The N poles ground connection of the diode D6；The EN pins and polar capacitor C9 of the driving chip U3 is just
Pole is connected, its GND pin ground connection；The grounded collector of the triode VT4, the N poles of its emitter stage and voltage-regulator diode D7
It is connected.
3. a kind of base according to claim 2 has the light-operated LED pair protection formula Switching Power Supplies of constant current driving processing, it is special
Sign is that the phase adjusting circuit is managed by triode VT1, triode VT2, positive pole after resistance R1 with control chip U2 SS
Polar capacitor C3, the P pole that pin is connected, negative pole is connected with triode VT1 emitter stage and control chip U2 SIN pin phases
The diode D2 that connection, N poles are connected with triode VT1 colelctor electrode, positive pole are managed after resistance R4 with control chip U2 COC
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 U2
FC pins be connected, the polar capacitor C5 that positive pole is connected after resistance R5 with triode VT2 colelctor electrode, and N poles warp
It is connected after resistance R7 with control chip U2 CR pins, two that P poles are connected after resistance R6 with triode VT2 emitter stage
Pole pipe D3 is formed；The N poles of the diode D3 are connected with control chip U2 SHDN pins, its P pole is with triode VT101's
Emitter stage is connected；The base stage of the triode VT2 is connected with triode VT1 base stage, its emitter stage and polar capacitor C4
Negative pole be connected after be grounded；The positive pole of the polar capacitor C4 is connected with triode VT1 base stage.
4. a kind of base according to claim 3 has the light-operated LED pair protection formula Switching Power Supplies of constant current driving processing, it is special
Sign is, the voltage conditioning output circuit is by FET MOS, triode VT3, positive pole after resistance R8 with triode VT3
Emitter stage be connected, the polar capacitor C6 that negative pole is connected with diode rectifier U1 cathode output end, one end and field are imitated
Should pipe MOS drain electrode be connected, the adjustable resistance R12 that the other end is connected with voltage stabilizing chip U101OUT pins, one end and polarity
Inductance L2, the N pole that electric capacity C6 positive pole is connected, the other end is connected with voltage stabilizing chip U101 OUT pins is after resistance R10
It is connected with FET MOS source electrode, the diode D4 that P poles are connected with triode VT3 base stage, negative pole and triode
The polar capacitor C7 that VT3 colelctor electrode is connected, positive pole is connected with FET MOS grid, and positive pole is sequentially through electricity
It is connected after resistance R9 and inductance L1 with control chip U2 FB pins, adjustable end of the negative pole after resistance R11 with adjustable resistance R12
The polar capacitor C8 compositions being connected；The grid of the FET MOS is managed with control chip U2 VOUT pins and PWM respectively
Pin is connected, its drain electrode is connected with polar capacitor C9 negative pole.
5. a kind of base according to claim 4 has the light-operated LED pair protection formula Switching Power Supplies of constant current driving processing, it is special
Sign is that the control chip U2 is L296 integrated chips.
6. a kind of base according to claim 4 has the light-operated LED pair protection formula Switching Power Supplies of constant current driving processing, it is special
Sign is that the 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 |
|---|---|---|---|
| CN201711047305.8A CN107734753A (en) | 2017-10-31 | 2017-10-31 | A kind of base has the light-operated LED pair protection formula Switching Power Supplies of constant current driving processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711047305.8A CN107734753A (en) | 2017-10-31 | 2017-10-31 | A kind of base has the light-operated LED pair protection formula Switching Power Supplies of constant current driving processing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271923A (en) * | 2020-10-28 | 2021-01-26 | 中山市柏科电源有限公司 | Linear constant current and constant voltage circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271923A (en) * | 2020-10-28 | 2021-01-26 | 中山市柏科电源有限公司 | Linear constant current and constant voltage circuit |
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Application publication date: 20180223 |