CN106026706A - Voltage conditioning output circuit-based light-controlled LED switching power supply - Google Patents
Voltage conditioning output circuit-based light-controlled LED switching power supply Download PDFInfo
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- CN106026706A CN106026706A CN201610516952.8A CN201610516952A CN106026706A CN 106026706 A CN106026706 A CN 106026706A CN 201610516952 A CN201610516952 A CN 201610516952A CN 106026706 A CN106026706 A CN 106026706A
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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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/025—Current limitation using field effect transistors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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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]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
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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)
- Amplifiers (AREA)
Abstract
The present invention discloses a voltage conditioning output circuit-based light-controlled LED switching power supply, which is characterized by mainly comprising a control chip U2, a transformer T, a diode rectifier U1, a polar capacitor C1, a polar capacitor C2, a voltage-stabilizing diode D1, a pulse adjustment circuit, a voltage conditioning output circuit, an over-voltage and over-current protection circuit connected in series between the negative electrode output end of the diode rectifier U1 and the voltage conditioning output circuit, and a linear constant-current driving circuit connected with the voltage conditioning output circuit. According to the technical scheme of the invention, input voltage and current pulses are adjusted dynamically. Meanwhile, the strength of the output voltage and the strength of the output current are adjusted, so that the stability of the output voltage and the stability of the output current are ensured. Therefore, the brightness stability of a light-controlled LED lamp is effectively ensured. Meanwhile, the service life of the LED lamp is prolonged.
Description
Technical field
The present invention relates to electronic applications, specifically, be a kind of light-operated LED based on voltage conditioning output circuit
Switching Power 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 is
Become one of main product of people's life lighting.People's many employings acoustic control or light-operated control system in life
System realizes the open and close to LED.Light-operated LED control system can use according to LED because of it
The brightness of environment controls the open and close of LED, and can effectively meet people to LED energy-conservation
The requirement of aspect, and enjoy the favor of people.But, existing light-operated LED power supply exist output voltage and
The problem that electric current is unstable, the brightness causing light-operated LED (liquid crystal diode) lamp is unstable, has had a strong impact on the use of LED
Life-span.
Therefore it provides a kind of light-operated LED power supply that can export stable voltage and current is the task of top priority.
Summary of the invention
It is an object of the invention to overcome light-operated LED power supply of the prior art to there is output voltage and electric current not
Stable defect, it is provided that a kind of based on voltage conditioning output circuit light-operated LED Switching Power Supply.
The present invention is achieved through the following technical solutions: a kind of light-operated LED based on voltage conditioning output circuit
Switching Power Supply, mainly by control chip U2, transformator T, diode rectifier U1, positive pole is whole with diode
The cathode output end of stream device U1 is connected, negative pole is connected with the cathode output end of diode rectifier U1
Polar capacitor C1, positive pole is connected with the positive pole of polar capacitor C1, negative pole after resistance R1 with polar capacitor
Polar capacitor C2, the N pole that the negative pole of C1 is connected is connected with the VIN pin of control chip U2, P
The Zener diode D1 that pole is connected with the cathode output end of diode rectifier U1, with control chip U2
The phase adjusting circuit being connected, the phase adjusting circuit being connected with control chip U2, with control chip
The voltage conditioning output circuit that U2 is connected, is serially connected in cathode output end and the voltage of diode rectifier U1
Over-voltage over-current protection circuit between conditioning output circuit, and the line being connected with voltage conditioning output circuit
Property constant-current drive circuit composition；Described phase adjusting circuit is connected with voltage conditioning output circuit；Described change
The Same Name of Ends of depressor T secondary inductance coil is connected with one of them input of diode rectifier U1, it
Non-same polarity is connected with another input of diode rectifier U1；The GND pipe of control chip U2
Foot ground connection.
Described over-voltage over-current protection circuit, by audion VT5, audion VT6, field effect transistor MOS2, is born
Pole is connected with the colelctor electrode of audion VT5, positive pole negative with diode rectifier U1 after resistance R21
Polar capacitor C13, the P pole that pole outfan is connected after resistance R22 with the positive pole phase of polar capacitor C13
Connect, diode D9, N pole that N pole base stage with audion VT5 after resistance R24 is connected is through resistance
After R26 the grid with field effect transistor MOS2 be connected, P pole after resistance R23 with polar capacitor C13's
The diode D10 that positive pole is connected, one end is connected with the drain electrode of field effect transistor MOS2, the other end and two
The adjustable resistance R25 that the P pole of pole pipe D10 is connected, positive pole after resistance R28 with the N of diode D9
The polar capacitor C14 that pole is connected, negative pole emitter stage with audion VT5 after resistance R27 is connected,
P pole is connected with the emitter stage of audion VT6, N pole is connected with the drain electrode of field effect transistor MOS2 two
Pole pipe D11, positive pole colelctor electrode with audion VT6 after adjustable resistance R29 is connected, minus earth
Polar capacitor C16, and positive pole is connected with the base stage of audion VT6, negative pole and adjustable resistance R29
The polar capacitor C15 composition that adjustable end is connected；The positive pole of described polar capacitor C14 is with audion VT6's
Colelctor electrode is connected, its negative pole is connected with the source electrode of field effect transistor MOS2；The P of described diode D9
Pole ground connection；The colelctor electrode of described audion VT6 as the outfan of over-voltage over-current protection circuit and is adjusted with voltage
Reason output circuit is connected.
Described linear constant current drive circuit by driving chip U3, audion VT4, positive pole after resistance R13 with
The IN pin of driving chip U3 is connected, negative pole as linear constant current drive circuit input and and voltage
Polar capacitor C9, the P pole that is connected of conditioning output circuit after resistance R14 with the BOOST of driving chip U3
The diode D6 that pin is connected, N pole is connected with the SW pin of driving chip U3 after resistance R25,
Negative pole P pole with diode D6 after resistance R16 is connected, positive pole with for the second quarter 6 N pole be connected
Polar capacitor C11, P pole be connected with the positive pole of polar capacitor C11, N pole as linear constant current drive electricity
The Zener diode D7 of the outfan on road, one end is connected with the positive pole of polar capacitor C11, the other end and two
The resistance R17 that the N pole of pole pipe D6 is connected, positive pole is managed with the FB of driving chip U3 after resistance R18
The polar capacitor C12 that foot is connected, negative pole is connected with the base stage of audion VT4, positive pole and driving chip
The FB pin of U3 is connected, the polar capacitor C10 of minus earth, and N pole after resistance R19 with pole
The negative pole of property electric capacity C10 is connected, P pole emitter stage with audion VT4 after resistance R20 is connected
Diode D8 forms；The N pole ground connection of described diode D6；The EN pin of described driving chip U3 with
The positive pole of polar capacitor C9 is connected, its GND pin ground connection；The grounded collector of described audion VT4,
Its emitter stage is connected with the N pole of Zener diode D7.
Described phase adjusting circuit by audion VT1, audion VT2, positive pole after resistance R1 with control core
The polar capacitor C3, P that the SS pin of sheet U2 is connected, negative pole is connected with the emitter stage of audion VT1
Pole is connected with the SIN pin of control chip U2, N pole is connected with the colelctor electrode of audion VT1 two
Pole pipe D2, positive pole COC pin with control chip U2 after resistance R4 is connected, negative pole is through resistance R3
The FC pipe of the polar capacitor C4 that the emitter stage with audion VT1 is connected afterwards, negative pole and control chip U2
The polar capacitor C5 that foot is connected, positive pole colelctor electrode with audion VT2 after resistance R5 is connected, with
And N pole CR pin with control chip U2 after resistance R7 is connected, P pole after resistance R6 with three
The diode D3 composition that the emitter stage of pole pipe VT2 is connected；The N pole of described diode D3 and control core
The SHDN pin of sheet U2 is connected, its P pole as the outfan of phase adjusting circuit and is nursed one's health with voltage
Output circuit is connected；The base stage of described audion VT2 is connected with the base stage of audion VT1, it is launched
Pole be connected with the negative pole of polar capacitor C4 after ground connection；The positive pole of described polar capacitor C4 and audion VT1
Base stage be connected.
Described voltage conditioning output circuit is by field effect transistor MOS1, audion VT3, and positive pole is after resistance R8
Be connected with the emitter stage of audion VT3, polar capacitor that negative pole is connected with the colelctor electrode of audion VT6
The drain electrode with field effect transistor MOS1 after adjustable resistance R12 of C6, N pole is connected, P pole and diode D3
The Zener diode D5 that is connected of P pole, one end is connected with the positive pole of polar capacitor C6, the other end with
Inductance L2, the N pole that the N pole of Zener diode D5 is connected after resistance R10 with field effect transistor MOS1
The diode D4 that source electrode is connected, P pole is connected with the base stage of audion VT3, negative pole and audion
The polar capacitor C7 that the colelctor electrode of VT3 is connected, positive pole is connected with the grid of field effect transistor MOS1, with
And positive pole is sequentially connected through resistance R9 FB pin with control chip U2 after inductance L1, negative pole is through electricity
The polar capacitor C8 composition being connected with the adjustable end of adjustable resistance R12 after resistance R11；Described voltage stabilizing two pole
The N pole of pipe D5 is connected with the negative pole of polar capacitor C6；The grid of described field effect transistor MOS1 respectively with
The VOUT pin of control chip U2 is connected with PWM pin, it drains the negative pole with polar capacitor C9
It is connected；The N pole of described Zener diode D5 is as the outfan of voltage conditioning output circuit.
For the practical effect of the present invention, described control chip U2 the most preferentially uses the integrated chip of L296
Realize；The most described driving chip U3 the most preferentially have employed the integrated chip of LM2734X and realizes.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) pulse of input voltage and electric current can be dynamically adjusted by the present invention, and the present invention can also be right
The intensity of output voltage and electric current is adjusted, and ensures that stablizing of the voltage and current that the present invention exports
Property, effectively ensure that the stability of light-operated LED (liquid crystal diode) lamp brightness, and improve the service life of LED.
(2) present invention can to input high voltage and high electric current suppress, effectively eliminated high voltage and
The impact of high electric current, thus improve the stability of the voltage and current of present invention output, it is effectively prevented
LED is by high voltage and high circuit damage.
(3) present invention can export stable driving voltage and electric current, makes output voltage and electric current and reference voltage
Consistent with electric current, ensure that the present invention exports stable voltage and current.
(4) the control chip U of the present invention uses the integrated chip of L296 to realize, and this chip and external electrical
Road combines and effectively raises stability and the reliability of output voltage of the present invention and electric current.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic 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.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing thereof, the present invention is described in further detail, but the enforcement of the present invention
Mode is not limited to this.
Embodiment
As it is shown in figure 1, the present invention is mainly by control chip U2, transformator T, diode rectifier U1, pole
Property electric capacity C1, polar capacitor C2, Zener diode D1, over-voltage over-current protection circuit, linear constant current drive
Circuit, phase adjusting circuit, and voltage conditioning output circuit composition.
During connection, the positive pole of polar capacitor C1 is connected with the cathode output end of diode rectifier U1, it
Negative pole is connected with the cathode output end of diode rectifier U1.The positive pole of polar capacitor C2 and polar capacitor
The positive pole of C1 is connected, negative pole negative pole with polar capacitor C1 after resistance R1 is connected.Zener diode
The N pole of D1 is connected with the VIN pin of control chip U2, its P pole and diode rectifier U1 just
Pole outfan is connected.Phase adjusting circuit is connected with control chip U2.Voltage conditioning output circuit is respectively
It is connected with control chip U2 and diode rectifier U1.It is whole that over-voltage over-current protection circuit is serially connected in diode
Between cathode output end and the voltage conditioning output circuit of stream device U1.Linear constant current drive circuit is nursed one's health with voltage
Output circuit is connected.
Described phase adjusting circuit is connected with voltage conditioning output circuit；Described transformator T secondary inductance line
The Same Name of Ends of circle is connected with one of them input of diode rectifier U1, its non-same polarity and diode
Another input of commutator U1 is connected；The GND pin ground connection of control chip U2；Described transformation
The Same Name of Ends of device T former limit inductance coil is connected with external power source respectively with non-same polarity.
Wherein, described phase adjusting circuit by audion VT1, audion 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 form.
During connection, the positive pole of polar capacitor C3 SS pin with control chip U2 after resistance R1 is connected,
Its negative pole is connected with the emitter stage of audion VT1.The P pole of diode D2 and the SIN of control chip U2
Pin is connected, its N pole is connected with the colelctor electrode of audion VT1.The positive pole of polar capacitor C4 is through electricity
Resistance R4 after be connected with the COC pin of control chip U2, its negative pole after resistance R3 with audion VT1
Emitter stage be connected.The negative pole of polar capacitor C5 is connected with the FC pin of control chip U2, its just
Pole colelctor electrode with audion VT2 after resistance R5 is connected.The N pole of diode D3 is after resistance R7
Be connected with the CR pin of control chip U2, its P pole after resistance R6 with the emitter stage of audion VT2
It is connected.
The N pole of described diode D3 is connected with the SHDN pin of control chip U2, its P pole conduct
The outfan of phase adjusting circuit is also connected with voltage conditioning output circuit；The base stage of described audion VT2
Be connected with the base stage of audion VT1, its emitter stage be connected with the negative pole of polar capacitor C4 after ground connection；
The positive pole of described polar capacitor C4 is connected with the base stage of audion VT1.
Further, described voltage conditioning output circuit is by field effect transistor MOS1, audion VT3, resistance
R8, resistance R9, resistance R10, resistance R11, adjustable resistance R12, polar capacitor C6, polar capacitor
C7, polar capacitor C8, diode D4, Zener diode D5, and inductance L2 form.
During connection, the positive pole of polar capacitor C6 emitter stage with audion VT3 after resistance R8 is connected,
Its negative pole is connected with the colelctor electrode of audion VT6.The N pole of Zener diode D5 is through adjustable resistance R12
Be connected with the drain electrode of field effect transistor MOS1 afterwards, its P pole is connected with the P pole of diode D3.Inductance
One end of L2 is connected with the positive pole of polar capacitor C6, the N pole phase of its other end and Zener diode D5
Connect.
Meanwhile, the N pole of diode D4 source electrode with field effect transistor MOS1 after resistance R10 be connected,
Its P pole is connected with the base stage of audion VT3.The negative pole of polar capacitor C7 and the current collection of audion VT3
Pole is connected, its positive pole is connected with the grid of field effect transistor MOS1.The positive pole of polar capacitor C8 sequentially warp
Resistance R9 is connected with FB pin with control chip U2 after inductance L1, its negative pole after resistance R11 with
The adjustable end of adjustable resistance R12 is connected.
The N pole of described Zener diode D5 is connected with the negative pole of polar capacitor C6；Described field effect transistor
The grid of MOS1 is connected with VOUT pin and the PWM pin of control chip U2 respectively, its drain electrode with
The negative pole of polar capacitor C9 is connected；Output circuit is nursed one's health as voltage in the N pole of described Zener diode D5
Outfan.
As in figure 2 it is shown, described linear constant current drive circuit is by driving chip U3, audion VT4, resistance
R13, resistance R14, resistance R15, resistance R16, resistance R17, resistance R18, resistance R19, resistance
R20, polar capacitor C9, polar capacitor C10, polar capacitor C11, polar capacitor C12, diode D6,
Zener diode D7, and diode D8 composition.
During connection, the positive pole of polar capacitor C9 IN pin with driving chip U3 after resistance R13 is connected
Connect, its negative pole as the input of linear constant current drive circuit and is connected with voltage conditioning output circuit.Two
The P pole of pole pipe D6 BOOST pin with driving chip U3 after resistance R14 is connected, its N pole warp
After resistance R25, the SW pin with driving chip U3 is connected.The negative pole of polar capacitor C11 is through resistance R16
Be connected with the P pole of diode D6 afterwards, its positive pole is connected with the N pole of the second quarter 6.Zener diode
The P pole of D7 is connected with the positive pole of polar capacitor C11, its N pole is as the output of linear constant current drive circuit
End, this outfan is connected with LED respectively with the outfan of voltage conditioning output circuit.
Meanwhile, one end of resistance R17 be connected with the positive pole of polar capacitor C11, its other end and diode
The N pole of D6 is connected.The positive pole of polar capacitor C12 is managed with the FB of driving chip U3 after resistance R18
Foot is connected, its negative pole is connected with the base stage of audion VT4.The positive pole of polar capacitor C10 and driving core
The FB pin of sheet U3 is connected, its minus earth.The N pole of diode D8 after resistance R19 with polarity
The negative pole of electric capacity C10 is connected, its P pole emitter stage with audion VT4 after resistance R20 is connected.
The N pole ground connection of described diode D6；The EN pin of described driving chip U3 and polar capacitor C9
Positive pole be connected, its GND pin ground connection；The grounded collector of described audion VT4, its emitter stage
It is connected with the N pole of Zener diode D7.
As it is shown on figure 3, described over-voltage over-current protection circuit is by audion VT5, audion VT6, field effect
Pipe 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, pole
Property electric capacity C15, polar capacitor C16, diode D9, diode D10, and diode D11 composition.
During connection, the negative pole of polar capacitor C13 is connected with the colelctor electrode of audion VT5, its positive pole is through electricity
It is connected with the cathode output end of diode rectifier U1 after resistance R21.The P pole of diode D9 is through resistance
After R22 the positive pole with polar capacitor C13 be connected, its N pole after resistance R24 with the base of audion VT5
Pole is connected.The N pole of diode D10 grid with field effect transistor MOS2 after resistance R26 is connected,
Its P pole positive pole with polar capacitor C13 after resistance R23 is connected.
Meanwhile, one end of adjustable resistance R25 be connected with the drain electrode of field effect transistor MOS2, its other end with
The P pole of diode D10 is connected.The positive pole of polar capacitor C14 after resistance R28 with diode D9's
N pole is connected, its negative pole emitter stage with audion VT5 after resistance R27 is connected.Diode D11
P pole be connected with the emitter stage of audion VT6, its N pole is connected with the drain electrode of field effect transistor MOS2.
The positive pole of polar capacitor C16 colelctor electrode with audion VT6 after adjustable resistance R29 is connected, its negative pole
Ground connection.The positive pole of polar capacitor C15 is connected with the base stage of audion VT6, its negative pole and adjustable resistance R29
Adjustable end be connected.
The positive pole of described polar capacitor C14 is connected with the colelctor electrode of audion VT6, its negative pole and field effect
The source electrode of pipe MOS2 is connected；The P pole ground connection of described diode D9；The current collection of described audion VT6
Pole as the outfan of over-voltage over-current protection circuit and is connected with voltage conditioning output circuit.
During operation, the pulse of input voltage and electric current can be dynamically adjusted by the present invention, and the present invention is also
The intensity of output voltage and electric current can be adjusted, ensure that the voltage and current that the present invention exports
Stability, effectively ensure that the stability of light-operated LED (liquid crystal diode) lamp brightness, and improves the use longevity of LED
Life.The high voltage of input and high electric current can be suppressed by the present invention, effectively eliminated high voltage and height electricity
The impact of stream, thus improve the stability of the voltage and current of present invention output, it is effectively prevented LED
Lamp is by high voltage and high circuit damage.
Meanwhile, the present invention can export stable driving voltage and electric current, makes output voltage and electric current and benchmark electricity
Press consistent with electric current, ensure that the present invention exports stable voltage and current.The control chip U of the present invention
Using the integrated chip of L296 to realize, this chip has the function such as overtemperature protection and short-circuit protection, and this core
Sheet combines with external circuit and effectively raises stability and the reliability of output voltage of the present invention and electric current.
For the practical effect of the present invention, described driving chip U3 the most preferentially have employed stable performance
The integrated chip of LM2734X realizes.
According to above-described embodiment, can well realize the present invention.
Claims (7)
1. a light-operated LED Switching Power Supply based on voltage conditioning output circuit, it is characterised in that main
Positive pole by control chip U2, transformator T, diode rectifier U1, positive pole and diode rectifier U1
The polar capacitor C1 that outfan is connected, negative pole is connected with the cathode output end of diode rectifier U1,
Positive pole is connected with the positive pole of polar capacitor C1, negative pole after resistance R1 with the negative pole phase of polar capacitor C1
Polar capacitor C2, the N pole connected is connected with the VIN pin of control chip U2, P pole is whole with diode
The Zener diode D1 that the cathode output end of stream device U1 is connected, the pulse being connected with control chip U2 is adjusted
Whole circuit, the phase adjusting circuit being connected with control chip U2, the voltage being connected with control chip U2
Conditioning output circuit, is serially connected between the cathode output end of diode rectifier U1 and voltage conditioning output circuit
Over-voltage over-current protection circuit, and with the voltage conditioning linear constant current drive circuit group that is connected of output circuit
Become；Described phase adjusting circuit is connected with voltage conditioning output circuit；Described transformator T secondary inductance line
The Same Name of Ends of circle is connected with one of them input of diode rectifier U1, its non-same polarity and diode
Another input of commutator U1 is connected；The GND pin ground connection of control chip U2.
A kind of light-operated LED switch electricity based on voltage conditioning output circuit the most according to claim 1
Source, it is characterised in that described over-voltage over-current protection circuit is by audion VT5, audion VT6, field effect
Pipe MOS2, negative pole is connected with the colelctor electrode of audion VT5, positive pole is whole with diode after resistance R21
Polar capacitor C13, the P pole that is connected of cathode output end of stream device U1 after resistance R22 with polar capacitor
The diode D9 that the positive pole of C13 is connected, N pole base stage with audion VT5 after resistance R24 is connected,
N pole grid with field effect transistor MOS2 after resistance R26 is connected, P pole after resistance R23 with polarity
The diode D10 that the positive pole of electric capacity C13 is connected, one end is connected with the drain electrode of field effect transistor MOS2,
The adjustable resistance R25 that the other end is connected with the P pole of diode D10, positive pole after resistance R28 with two poles
The polarity that the N pole of pipe D9 is connected, negative pole emitter stage with audion VT5 after resistance R27 is connected
Electric capacity C14, P pole is connected with the emitter stage of audion VT6, the drain electrode of N pole and field effect transistor MOS2
The diode D11 being connected, positive pole colelctor electrode with audion VT6 after adjustable resistance R29 is connected,
The polar capacitor C16 of minus earth, and positive pole is connected with the base stage of audion VT6, negative pole is with adjustable
The polar capacitor C15 composition that the adjustable end of resistance R29 is connected；The positive pole and three of described polar capacitor C14
The colelctor electrode of pole pipe VT6 is connected, its negative pole is connected with the source electrode of field effect transistor MOS2；Described two poles
The P pole ground connection of pipe D9；The colelctor electrode of described audion VT6 is as the outfan of over-voltage over-current protection circuit
And be connected with voltage conditioning output circuit.
A kind of light-operated LED switch electricity based on voltage conditioning output circuit the most according to claim 2
Source, it is characterised in that described linear constant current drive circuit is by driving chip U3, audion VT4, positive pole warp
After resistance R13 the IN pin with driving chip U3 be connected, negative pole defeated as linear constant current drive circuit
Enter end and with polar capacitor C9, the P pole that is connected of voltage conditioning output circuit after resistance R14 with drive core
The BOOST pin of sheet U3 is connected, N pole after resistance R25 with the SW pin phase of driving chip U3
The diode D6 connected, negative pole P pole with diode D6 after resistance R16 is connected, positive pole and two seasons
Polar capacitor C11, the P pole that the N pole of degree 6 is connected is connected with the positive pole of polar capacitor C11, N pole
Positive pole as the Zener diode D7 of the outfan of linear constant current drive circuit, one end and polar capacitor C11
Be connected, resistance R17 that the other end is connected with the N pole of diode D6, positive pole after resistance R18 with
The polar capacitor that the FB pin of driving chip U3 is connected, negative pole is connected with the base stage of audion VT4
C12, positive pole is connected with the FB pin of driving chip U3, the polar capacitor C10 of minus earth, and N
Pole negative pole with polar capacitor C10 after resistance R19 is connected, P pole after resistance R20 with audion VT4
Emitter stage be connected diode D8 composition；The N pole ground connection of described diode D6；Described driving chip
The EN pin of U3 is connected with the positive pole of polar capacitor C9, its GND pin ground connection；Described audion
The grounded collector of VT4, its emitter stage are connected with the N pole of Zener diode D7.
A kind of light-operated LED switch electricity based on voltage conditioning output circuit the most according to claim 3
Source, it is characterised in that described phase adjusting circuit is by audion VT1, and audion VT2, positive pole is through resistance
After R1, the SS pin with control chip U2 is connected, negative pole is connected with the emitter stage of audion VT1
Polar capacitor C3, P pole is connected with the SIN pin of control chip U2, the collection of N pole and audion VT1
The diode D2 that electrode is connected, positive pole COC pin with control chip U2 after resistance R4 is connected,
The polar capacitor C4 that negative pole emitter stage with audion VT1 after resistance R3 is connected, negative pole with control core
The pole that the FC pin of sheet U2 is connected, positive pole colelctor electrode with audion VT2 after resistance R5 is connected
Property electric capacity C5, and N pole CR pin with control chip U2 after resistance R7 is connected, P pole is through electricity
The diode D3 composition being connected with the emitter stage of audion VT2 after resistance R6；The N of described diode D3
Pole is connected with the SHDN pin of control chip U2, its P pole as phase adjusting circuit outfan also
It is connected with voltage conditioning output circuit；The base stage of described audion VT2 is connected with the base stage of audion VT1
Connect, its emitter stage be connected with the negative pole of polar capacitor C4 after ground connection；The positive pole of described polar capacitor C4 with
The base stage of audion VT1 is connected.
A kind of light-operated LED switch electricity based on voltage conditioning output circuit the most according to claim 4
Source, it is characterised in that described voltage conditioning output circuit by field effect transistor MOS1, audion VT3, just
Pole emitter stage with audion VT3 after resistance R8 is connected, the colelctor electrode phase of negative pole and audion VT6
Polar capacitor C6, the N pole connected drain electrode with field effect transistor MOS1 after adjustable resistance R12 is connected,
The Zener diode D5 that P pole is connected with the P pole of diode D3, the positive pole phase of one end and polar capacitor C6
Connect, inductance L2, the N pole that is connected with the N pole of Zener diode D5 of the other end after resistance R10 and
The diode D4 that the source electrode of field effect transistor MOS1 is connected, P pole is connected with the base stage of audion VT3,
The pole that negative pole is connected with the colelctor electrode of audion VT3, positive pole is connected with the grid of field effect transistor MOS1
Property electric capacity C7, and positive pole sequentially after resistance R9 and inductance L1 with the FB pin phase of control chip U2
The polar capacitor C8 composition that connection, negative pole are connected with the adjustable end of adjustable resistance R12 after resistance R11；
The N pole of described Zener diode D5 is connected with the negative pole of polar capacitor C6；Described field effect transistor MOS1
Grid be connected with VOUT pin and the PWM pin of control chip U2 respectively, its drain electrode with polarity electricity
The negative pole holding C9 is connected；The N pole of described Zener diode D5 is as the output of voltage conditioning output circuit
End.
A kind of light-operated LED switch electricity based on voltage conditioning output circuit the most according to claim 5
Source, it is characterised in that described control chip U2 is the integrated chip of L296.
A kind of light-operated LED switch electricity based on voltage conditioning output circuit the most according to claim 5
Source, it is characterised in that described driving chip U3 is the integrated chip of LM2734X.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610516952.8A CN106026706A (en) | 2016-07-04 | 2016-07-04 | Voltage conditioning output circuit-based light-controlled LED switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610516952.8A CN106026706A (en) | 2016-07-04 | 2016-07-04 | Voltage conditioning output circuit-based light-controlled LED switching power supply |
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| CN106026706A true CN106026706A (en) | 2016-10-12 |
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|---|---|---|---|
| CN201610516952.8A Pending CN106026706A (en) | 2016-07-04 | 2016-07-04 | Voltage conditioning output circuit-based light-controlled LED switching power supply |
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| Country | Link |
|---|---|
| CN (1) | CN106026706A (en) |
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2016
- 2016-07-04 CN CN201610516952.8A patent/CN106026706A/en active Pending
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