CN106028546A - Light-operated LED switch power supply based on pulse adjustment circuit - Google Patents
Light-operated LED switch power supply based on pulse adjustment circuit Download PDFInfo
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- CN106028546A CN106028546A CN201610525133.XA CN201610525133A CN106028546A CN 106028546 A CN106028546 A CN 106028546A CN 201610525133 A CN201610525133 A CN 201610525133A CN 106028546 A CN106028546 A CN 106028546A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- 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]
- H05B45/10—Controlling the intensity of the light
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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Abstract
The invention discloses a light-operated LED switch power supply based on a pulse adjustment circuit. The light-operated LED switch power supply is characterized by mainly consisting of a control chip U2, a transformer T, a diode rectifier U1, a polarity capacitor C1, a polarity capacitor C2, a voltage-stabilizing diode D1, a pulse adjustment circuit, a voltage conditioning output circuit, an overvoltage and overcurent protection circuit, and a comparison amplification circuit connected in series between a PWM pin of the control chip U2 and the voltage conditioning output circuit. According to the invention, pulses of input voltages and currents can be dynamically adjusted, intensity of output voltages and currents can also be adjusted, the stability of the output voltages and currents is guaranteed, the stability of brightness of a light-operated LED lamp is effectively ensured, and the service life of the LED lamp is prolonged.
Description
Technical field
The present invention relates to electronic applications, specifically, be that a kind of light-operated LED based on phase adjusting circuit is opened
Close 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 phase adjusting 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 phase adjusting circuit is opened
Close power supply, mainly by control chip U2, transformator T, diode rectifier U1, positive pole and diode rectification
The pole that the cathode output end of device U1 is connected, negative pole is connected with the cathode output end of diode rectifier U1
Property electric capacity 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 it is serially connected in the PWM pin of control chip U2
And the comparison amplifying circuit composition between voltage conditioning output circuit；Described phase adjusting circuit is nursed one's health with voltage
Output circuit is connected；Its of the Same Name of Ends of described transformator T secondary inductance coil and diode rectifier U1
In input is connected, its non-same polarity is connected with another input of diode rectifier U1；
The GND pin ground connection of control chip U2.
Described over-voltage over-current protection circuit, by audion VT7, audion VT8, field effect transistor MOS2, is born
Pole is connected with the colelctor electrode of audion VT7, positive pole negative with diode rectifier U1 after resistance R23
Polar capacitor C14, the P pole that pole outfan is connected after resistance R24 with the positive pole phase of polar capacitor C14
Connect, diode D9, N pole that N pole base stage with audion VT7 after resistance R26 is connected is through resistance
After R28 the grid with field effect transistor MOS2 be connected, P pole after resistance R25 with polar capacitor C14'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 R27 that the P pole of pole pipe D10 is connected, positive pole after resistance R30 with the N of diode D9
The polar capacitor C15 that pole is connected, negative pole emitter stage with audion VT7 after resistance R29 is connected,
P pole is connected with the emitter stage of audion VT8, N pole is connected with the drain electrode of field effect transistor MOS2 two
Pole pipe D11, positive pole colelctor electrode with audion VT8 after adjustable resistance R31 is connected, minus earth
Polar capacitor C17, and positive pole is connected with the base stage of audion VT8, negative pole and adjustable resistance R31
The polar capacitor C16 composition that adjustable end is connected；The positive pole of described polar capacitor C15 is with audion VT8'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 VT8 as the outfan of over-voltage over-current protection circuit and is adjusted with voltage
Reason output circuit is connected.
The described amplifying circuit that compares is by audion VT4, audion VT5, and audion VT6, positive pole is through resistance
After R14 the base stage with audion VT4 be connected, negative pole as compare amplifying circuit input and with control
Polar capacitor C9, the P pole that the PWM pin of chip U2 is connected after resistance R13 with polar capacitor C9
The diode D6 that positive pole is connected, N pole colelctor electrode with audion VT4 after resistance R18 is connected,
Positive pole positive pole with polar capacitor C9 after resistance R15 is connected, the polar capacitor C10 of minus earth, negative
The polar capacitor that pole is connected with the base stage of audion VT6, positive pole is connected with the colelctor electrode of audion VT4
C11, N pole is connected with the base stage of audion VT5, P pole after resistance R17 with audion VT4 send out
The diode D7 that emitter-base bandgap grading is connected, positive pole emitter stage with audion VT4 after resistance R16 is connected,
Negative pole be connected with the emitter stage of audion VT5 after the polar capacitor C12 of ground connection, positive pole is after resistance R21
Be connected with the emitter stage of audion VT6, negative pole emitter stage with audion VT5 after resistance R20 is connected
The polar capacitor C13 connect, one end is connected with the N pole of diode D6, the other end and audion VT6
The resistance R19 that colelctor electrode is connected, and P pole is connected with the colelctor electrode of audion VT6, N pole warp can
The Zener diode D8 composition being connected with the negative pole of polar capacitor C13 after adjusting resistance R22；Described three poles
The colelctor electrode of pipe VT5 is connected with the emitter stage of audion VT6；The N pole of described Zener diode D8 is made
For comparing the outfan of amplifying circuit and being connected with voltage conditioning output circuit.
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 VT8
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 the N pole of Zener diode D8, its drain electrode and voltage stabilizing two
The N pole of pole pipe D5 is collectively forming 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 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) voltage amplitude and current amplitude can be strengthened by the present invention, thus improve the present invention and export electricity
Pressure and the accuracy of electric current.
(4) the control chip U of the present invention uses the integrated chip of L296 to realize, and this chip has overtemperature protection
With functions such as short-circuit protections, and this chip combines with external circuit and effectively raises the present invention and export electricity
Press the stability with electric current and reliability.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the electrical block diagram of the comparison amplifying 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, compare amplifying 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.Relatively amplifying circuit is serially connected in control chip
Between the PWM pin of U2 and voltage conditioning output circuit.
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 VT8.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 respectively with the VOUT pin of control chip U2 and the N pole of Zener diode D8 is connected,
The N pole of its drain electrode and Zener diode D5 is collectively forming outfan and the LED of voltage conditioning output circuit
Lamp is connected.
As in figure 2 it is shown, the described amplifying circuit that compares is by audion VT4, audion VT5, audion VT6,
Resistance R13, resistance R14, resistance R15, resistance R16, resistance R17, resistance R18, resistance R19,
Resistance R20, resistance R21, resistance R22, polar capacitor C9, polar capacitor C10, polar capacitor C11,
Polar capacitor C12, polar capacitor C13, diode D6, diode D7, and Zener diode D8 group
Become.
During connection, the positive pole of polar capacitor C9 base stage with audion VT4 after resistance R14 is connected,
Its negative pole is as comparing the input of amplifying circuit and being connected with the PWM pin of control chip U2.Two poles
The P pole of pipe D6 positive pole with polar capacitor C9 after resistance R13 is connected, its N pole is through resistance R18
Colelctor electrode with audion VT4 is connected afterwards.The positive pole of polar capacitor C10 is electric with polarity after resistance R15
The positive pole of appearance C9 is connected, its minus earth.The negative pole of polar capacitor C11 and the base stage of audion VT6
Be connected, its positive pole is connected with the colelctor electrode of audion VT4.
Wherein, the N pole of diode D7 is connected with the base stage of audion VT5, its P pole is through resistance R17
Emitter stage with audion VT4 is connected afterwards.The positive pole of polar capacitor C12 after resistance R16 with audion
Ground connection after the emitter stage of VT4 is connected, its negative pole is connected with the emitter stage of audion VT5.Polar capacitor
The positive pole of C13 emitter stage with audion VT6 after resistance R21 is connected, its negative pole is after resistance R20
It is connected with the emitter stage of audion VT5.One end of resistance R19 is connected with the N pole of diode D6,
Its other end is connected with the colelctor electrode of audion VT6.
Meanwhile, the P pole of Zener diode D8 is connected with the colelctor electrode of audion VT6, its N pole warp can
It is connected with the negative pole of polar capacitor C13 after adjusting resistance R22.The colelctor electrode of described audion VT5 and three poles
The emitter stage of pipe VT6 is connected；The N pole of described Zener diode D8 is as the output comparing amplifying circuit
End is also connected with voltage conditioning output circuit.
As it is shown on figure 3, described over-voltage over-current protection circuit is by audion VT7, audion VT8, field effect
Pipe MOS2, resistance R23, resistance R24, resistance R25, resistance R26, adjustable resistance R27, resistance
R28, resistance R29, resistance R30, adjustable resistance R31, polar capacitor C14, polar capacitor C15, pole
Property electric capacity C16, polar capacitor C17, diode D9, diode D10, and diode D11 composition.
During connection, the negative pole of polar capacitor C14 is connected with the colelctor electrode of audion VT7, its positive pole is through electricity
It is connected with the cathode output end of diode rectifier U1 after resistance R23.The P pole of diode D9 is through resistance
After R24 the positive pole with polar capacitor C14 be connected, its N pole after resistance R26 with the base of audion VT7
Pole is connected.The N pole of diode D10 grid with field effect transistor MOS2 after resistance R28 is connected,
Its P pole positive pole with polar capacitor C14 after resistance R25 is connected.
Meanwhile, one end of adjustable resistance R27 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 C15 after resistance R30 with diode D9's
N pole is connected, its negative pole emitter stage with audion VT7 after resistance R29 is connected.Diode D11
P pole be connected with the emitter stage of audion VT8, its N pole is connected with the drain electrode of field effect transistor MOS2.
The positive pole of polar capacitor C17 colelctor electrode with audion VT8 after adjustable resistance R31 is connected, its negative pole
Ground connection.The positive pole of polar capacitor C16 is connected with the base stage of audion VT8, its negative pole and adjustable resistance R31
Adjustable end be connected.
The positive pole of described polar capacitor C15 is connected with the colelctor electrode of audion VT8, 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 VT8
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, voltage amplitude and current amplitude can be strengthened by the present invention, thus improve present invention output
The accuracy of voltage and current.The control chip U of the present invention uses the integrated chip of L296 to realize, this chip
There is the function such as overtemperature protection and short-circuit protection, and this chip combines with external circuit and effectively raises
Output voltage of the present invention and the stability of electric current and reliability.
According to above-described embodiment, can well realize the present invention.
Claims (6)
1. a light-operated LED Switching Power Supply based on phase adjusting circuit, it is characterised in that main by controlling
Coremaking sheet U2, transformator T, diode rectifier U1, positive pole exports with the positive pole of diode rectifier U1
The polar capacitor C1 that end is connected, negative pole is connected with the cathode output end of diode rectifier U1, positive pole
Be connected with the positive pole of polar capacitor C1, negative pole negative pole with polar capacitor C1 after resistance R1 is connected
Polar capacitor C2, N pole be connected with the VIN pin of control chip U2, P pole and diode rectifier
The Zener diode D1 that the cathode output end of U1 is connected, the pulse being connected with control chip U2 adjusts electricity
Road, the phase adjusting circuit being connected with control chip U2, the voltage being connected with control chip U2 is nursed one's health
Output circuit, is serially connected in the mistake between the cathode output end of diode rectifier U1 and voltage conditioning output circuit
Pressure current foldback circuit, and be serially connected in the PWM pin of control chip U2 and voltage conditioning output circuit it
Between comparison amplifying circuit composition；Described phase adjusting circuit is connected with voltage conditioning output circuit；Described
The Same Name of Ends of transformator T secondary inductance coil is connected with one of them input of diode rectifier U1,
Its non-same polarity is connected with another input of diode rectifier U1；The GND of control chip U2
Pin ground connection.
A kind of light-operated LED Switching Power Supply based on phase adjusting circuit the most according to claim 1,
It is characterized in that, described over-voltage over-current protection circuit is by audion VT7, audion VT8, field effect transistor
MOS2, negative pole is connected with the colelctor electrode of audion VT7, positive pole after resistance R23 with diode rectification
Polar capacitor C14, the P pole that the cathode output end of device U1 is connected after resistance R24 with polar capacitor C14
Positive pole is connected, N pole base stage with audion VT7 after resistance R26 is connected diode D9, N
Pole grid with field effect transistor MOS2 after resistance R28 is connected, P pole after resistance R25 with polarity electricity
Holding the diode D10 that the positive pole of C14 is connected, one end is connected with the drain electrode of field effect transistor MOS2, separately
The adjustable resistance R27 that one end is connected with the P pole of diode D10, positive pole after resistance R30 with diode
The polarity electricity that the N pole of D9 is connected, negative pole emitter stage with audion VT7 after resistance R29 is connected
Hold C15, P pole be connected with the emitter stage of audion VT8, the drain electrode phase of N pole and field effect transistor MOS2
The diode D11 connected, positive pole colelctor electrode with audion VT8 after adjustable resistance R31 is connected, negative
The polar capacitor C17 of pole ground connection, and positive pole is connected with the base stage of audion VT8, negative pole and adjustable electric
The polar capacitor C16 composition that the adjustable end of resistance R31 is connected；The positive pole of described polar capacitor C15 and three poles
The colelctor electrode of pipe VT8 is connected, its negative pole is connected with the source electrode of field effect transistor MOS2；Described diode
The P pole ground connection of D9；The colelctor electrode of described audion VT8 as over-voltage over-current protection circuit outfan and with
Voltage conditioning output circuit is connected.
A kind of light-operated LED Switching Power Supply based on phase adjusting circuit the most according to claim 2,
It is characterized in that, the described amplifying circuit that compares is by audion VT4, audion VT5, audion VT6, just
Pole base stage with audion VT4 after resistance R14 is connected, negative pole is as the input comparing amplifying circuit
And polar capacitor C9, the P pole being connected with the PWM pin of control chip U2 after resistance R13 with pole
The positive pole of property electric capacity C9 is connected, N pole colelctor electrode with audion VT4 after resistance R18 is connected
Diode D6, positive pole positive pole with polar capacitor C9 after resistance R15 is connected, the polarity of minus earth
Electric capacity C10, negative pole is connected with the base stage of audion VT6, positive pole is connected with the colelctor electrode of audion VT4
Polar capacitor C11, the N pole connect is connected with the base stage of audion VT5, P pole after resistance R17 with three
The diode D7 that the emitter stage of pole pipe VT4 is connected, positive pole after resistance R16 with audion VT4 send out
The polar capacitor C12 of ground connection, positive pole after emitter-base bandgap grading is connected, negative pole is connected with the emitter stage of audion VT5
After resistance R21 the emitter stage with audion VT6 be connected, negative pole after resistance R20 with audion VT5
The polar capacitor C13 that is connected of emitter stage, one end is connected with the N pole of diode D6, the other end and three
The resistance R19 that the colelctor electrode of pole pipe VT6 is connected, and P pole is connected with the colelctor electrode of audion VT6,
The Zener diode D8 composition that N pole negative pole with polar capacitor C13 after adjustable resistance R22 is connected；
The colelctor electrode of described audion VT5 is connected with the emitter stage of audion VT6；Described Zener diode D8
N pole as compare amplifying circuit outfan and with voltage conditioning output circuit be connected.
A kind of light-operated LED Switching Power Supply based on phase adjusting circuit the most according to claim 3,
It is characterized in that, described phase adjusting circuit is by audion VT1, audion VT2, and positive pole is through resistance R1
Be connected with the SS pin of control chip U2 afterwards, polarity that negative pole is connected with the emitter stage of audion VT1
Electric capacity C3, P pole is connected with the SIN pin of control chip U2, the colelctor electrode of N pole and audion VT1
The diode D2 being connected, positive pole COC pin with control chip U2 after resistance R4 is connected, negative
The polar capacitor C4 that pole emitter stage with audion VT1 after resistance R3 is connected, negative pole and control chip
The polarity that the FC pin of U2 is connected, positive pole colelctor electrode with audion VT2 after resistance R5 is connected
Electric capacity C5, and N pole CR pin with control chip U2 after resistance R7 is connected, P pole is through resistance
The diode D3 composition that after R6, emitter stage with audion VT2 is connected；The N pole of described diode D3
Be connected with the SHDN pin of control chip U2, its P pole as phase adjusting circuit outfan and with
Voltage conditioning output circuit is connected；The base stage of described audion VT2 is 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 and three poles
The base stage of pipe VT1 is connected.
A kind of light-operated LED Switching Power Supply based on phase adjusting circuit the most according to claim 4,
It is characterized in that, described voltage conditioning output circuit is by field effect transistor MOS1, audion VT3, positive pole warp
After resistance R8, the emitter stage with audion VT3 is connected, negative pole is connected with the colelctor electrode of audion VT8
The drain electrode with field effect transistor MOS1 after adjustable resistance R12 of polar capacitor C6, N pole be connected, P pole
The Zener diode D5 being connected with the P pole of diode D3, one end is connected with the positive pole of polar capacitor C6,
Inductance L2, the N pole that the other end is connected with the N pole of Zener diode D5 after resistance R10 with field effect
The diode D4 that the source electrode of pipe MOS1 is connected, P pole is connected with the base stage of audion VT3, negative pole with
The polar capacitor that the colelctor electrode of audion VT3 is connected, positive pole is connected with the grid of field effect transistor MOS1
C7, and positive pole be sequentially connected through resistance R9 FB pin with control chip U2 after inductance L1, negative
The polar capacitor C8 composition that pole is connected with the adjustable end of adjustable resistance R12 after resistance R11；Described surely
The N pole of pressure diode 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 and the N pole of Zener diode D8 is connected, its drain electrode with
The N pole of Zener diode D5 is collectively forming the outfan of voltage conditioning output circuit.
A kind of light-operated LED Switching Power Supply based on phase adjusting circuit the most according to claim 5,
It is characterized in that, described control chip U2 is the integrated chip of L296.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610525133.XA CN106028546A (en) | 2016-07-04 | 2016-07-04 | Light-operated LED switch power supply based on pulse adjustment circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610525133.XA CN106028546A (en) | 2016-07-04 | 2016-07-04 | Light-operated LED switch power supply based on pulse adjustment circuit |
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| Publication Number | Publication Date |
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| CN106028546A true CN106028546A (en) | 2016-10-12 |
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| CN201610525133.XA Pending CN106028546A (en) | 2016-07-04 | 2016-07-04 | Light-operated LED switch power supply based on pulse adjustment circuit |
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| Country | Link |
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| CN (1) | CN106028546A (en) |
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2016
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Application publication date: 20161012 |