CN106211437A - A kind of comparison amplifying type LED power supply based on current detection circuit - Google Patents
A kind of comparison amplifying type LED power supply based on current detection circuit Download PDFInfo
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- CN106211437A CN106211437A CN201610565672.6A CN201610565672A CN106211437A CN 106211437 A CN106211437 A CN 106211437A CN 201610565672 A CN201610565672 A CN 201610565672A CN 106211437 A CN106211437 A CN 106211437A
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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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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Abstract
The invention discloses a kind of comparison amplifying type LED power supply based on current detection circuit, it is characterized in that, main by control chip U2, diode rectifier U1, transformator T, audion VT1, Zener diode D9, voltage-regulating circuit, constant pressure and flow drive circuit, the compositions such as relatively amplifying circuit, and the current detection circuit being serially connected between the OUT pin of control chip U2 and constant pressure and flow drive circuit.The high transient state of input voltage and electric current can be adjusted by the present invention, prevents the frequency of electric current from drift occur, makes voltage and current held stationary；And the present invention can carry out over-voltage and over-current regulation to output voltage and circuit, and wave energising pressure in output voltage and the unrestrained galvanization in output electric current can be suppressed, the intensity making output voltage and electric current improves more than 40%, thus effectively raises the load capacity of the present invention.
Description
Technical field
The present invention relates to electronic applications, specifically, be a kind of comparison amplifying type LED based on current detection circuit
Use power supply.
Background technology
Now with the improving constantly of living standard of people, the requirement to the landscaping of life is more and more higher, people
For the living environment made oneself beautiful, just use the LED with various light sources color that indoor are being beautified.So
And, existing LED power supply is easily occurred by extraneous Electromagnetic Interference that output voltage and electric current are unstable, cause light-operated
The brightness of LED is unstable, has had a strong impact on the service life of LED；And existing LED power supply there is also load
The problem of ability.
Stable voltage and current can be exported therefore it provides a kind of, the LED power supply of load capacity can be improved again
It it is the task of top priority.
Summary of the invention
It is an object of the invention to overcome LED electric power output voltage of the prior art and electric current unstable, and
And load capacity difference defect, it is provided that a kind of based on current detection circuit comparison amplifying type LED power supply.
The present invention is achieved through the following technical solutions: a kind of comparison amplifying type LED based on current detection circuit
With power supply, mainly by control chip U2, diode rectifier U1, transformator T, audion VT1, P pole after resistance R2 with three poles
The Zener diode D1 that the base stage of pipe VT1 is connected, N pole is connected with the VCC pin of control chip U2, positive pole is whole with diode
The polarity electricity of ground connection after the cathode output end of stream device U1 is connected, negative pole is connected with the cathode output end of diode rectifier U1
Holding C1, positive pole cathode output end with diode rectifier U1 after resistance R1 is connected, the polar capacitor C2, P of minus earth
Two poles that pole is connected with the VREF pin of control chip U2, N pole is connected with the RC pin of control chip U2 after resistance R3
Pipe D2, positive pole is connected with the Same Name of Ends of transformator T secondary inductance coil L3, negative pole and transformator T secondary inductance coil L3
Non-same polarity be connected after polar capacitor C11, the P pole of ground connection be connected with the positive pole of polar capacitor C11, N pole secondary with transformator T
The non-same polarity of limit inductance coil L3 is collectively forming the Zener diode D9 of outfan, one end and transformator T former limit inductance coil
The non-same polarity of L2 is connected, the resistance R14 of other end ground connection, is serially connected in cathode output end and three poles of diode rectifier U1
Comparison amplifying circuit between the emitter stage of pipe VT1, respectively with the COMP pin of control chip U2 and VFB pin and IS pin
The voltage-regulating circuit being connected, the constant pressure and flow being connected with colelctor electrode and the voltage-regulating circuit of audion VT1 respectively drives
Galvanic electricity road, and the current detection circuit composition being serially connected between the OUT pin of control chip U2 and constant pressure and flow drive circuit；
The Same Name of Ends of described constant pressure and flow drive circuit also former with transformator T limit inductance coil L1 and non-same polarity and inductance coil L2
Same Name of Ends be connected；The GND pin ground connection of described control chip U2, its IS pin are connected with RC pin.
The described amplifying circuit that compares by audion VT8, audion VT9, field effect transistor MOS2, positive pole after resistance R29 with
The polar capacitor C16 that the grid of field effect transistor MOS2 is connected, negative pole is connected with the cathode output end of diode rectifier U1,
The polarity electricity that negative pole is connected with the base stage of audion VT8, positive pole positive pole with polar capacitor C16 after resistance R28 is connected
Holding C19, positive pole positive pole with polar capacitor C16 after resistance R30 is connected, the polar capacitor C17 of minus earth, and positive pole is through electricity
Be connected with the drain electrode of field effect transistor MOS2 after resistance R31, polar capacitor C18, the P pole of minus earth after resistance R33 with three poles
The diode D14 that the colelctor electrode of pipe VT8 is connected, N pole is connected with the source electrode of field effect transistor MOS2, one end and audion VT8
Emitter stage be connected, the other end be connected with the colelctor electrode of audion VT9 after adjustable resistance R35, P electrode resistance R32 of ground connection
Be connected with the drain electrode of field effect transistor MOS2 afterwards, diode D15 that N pole is connected with the adjustable end of adjustable resistance R35, negative pole with
The polar capacitor C20, N that the base stage of audion VT9 is connected, positive pole emitter stage with audion VT8 after resistance R34 is connected
Pole emitter stage with audion VT9 after resistance R37 is connected, P pole after adjustable resistance R36 with the colelctor electrode of audion VT8
The diode D17 being connected, and P pole is connected with the colelctor electrode of audion VT8, N pole is connected with the emitter stage of audion VT1
The Zener diode D16 composition connect.
Further, described current detection circuit is by amplifier P, audion VT6, and audion VT7, P pole is after resistance R23
Be connected with the positive pole of amplifier P, diode D10 that N pole is connected with the OUT pin of control chip U2, positive pole is through resistance R20
Be connected with the N pole of diode D10 afterwards, the polar capacitor C12 of minus earth, positive pole is connected with the P pole of diode D10, negative
Polar capacitor C13, the P pole that pole base stage with audion VT6 after resistance R21 is connected after resistance R22 with polar capacitor C13
The diode D11 that positive pole is connected, N pole is connected with the emitter stage of audion VT6, positive pole after resistance R25 with amplifier P
Polar capacitor C15, the P pole that positive pole is connected, negative pole outfan with amplifier P after resistance R26 is connected through resistance R27
The diode D12 that negative pole with polar capacitor C15 is connected afterwards, N pole is connected with the negative pole of amplifier P, one end and audion
The emitter stage of VT6 is connected, the other end is connected with the colelctor electrode of audion VT7 adjustable resistance R24, N pole and polar capacitor
The colelctor electrode of the diode D13 that the negative pole of C15 is connected, P pole is connected with the base stage of audion VT7, negative pole and audion VT7
Be connected, polar capacitor C14 that positive pole is connected with the colelctor electrode of audion VT6, and the colelctor electrode of one end and audion VT6
Be connected, inductance L5 that the other end is connected with the colelctor electrode of audion VT7 composition；The negative pole of described amplifier P and adjustable electric
The adjustable end of resistance R24 is connected；The minus earth of described audion VT6；The N pole of described diode D13 drives with constant pressure and flow
Circuit is connected.
Described voltage-regulating circuit by audion VT2, audion VT3, P pole after resistance R4 with the COMP of control chip U2
The diode D3 that pin is connected, N pole colelctor electrode with audion VT2 after resistance R is connected, positive pole after resistance R6 with control
The VFB pin of coremaking sheet U2 is connected, polar capacitor C3, the N pole of minus earth is connected with the emitter stage of audion VT3, P pole
The diode D4 that emitter stage with audion VT2 is connected after resistance R8, negative pole is connected with the P pole of diode D4, positive pole
The polar capacitor C4 being connected with the base stage of audion VT2, one end is connected with the positive pole of polar capacitor C3, the other end and two poles
The resistance R7 that the N pole of pipe D4 is connected, positive pole is connected with the emitter stage of audion VT2, negative pole after resistance R9 with audion
Polar capacitor C5, the N pole that the emitter stage of VT3 is connected is connected with the IS pin of control chip U2, P pole and audion VT3
The diode D5 that emitter stage is connected, and positive pole base stage with audion VT3 after adjustable resistance R10 is connected, negative pole with
The polar capacitor C6 composition that constant pressure and flow drive circuit is connected；The RC pipe of the base stage of described audion VT3 and control chip U2
Foot is connected, its colelctor electrode is connected with the positive pole of polar capacitor C3.
Described constant pressure and flow drive circuit is by audion VT4, audion VT5, field effect transistor MOS, and N pole is after resistance R19
Be connected with the colelctor electrode of audion VT4, P pole Same Name of Ends of limit inductance coil L2 former with transformator T after resistance R18 is connected
Diode D8, the adjustable electric that P pole is connected, the other end is connected with the drain electrode of field effect transistor MOS of one end and diode D8
Resistance R17, the polar capacitor C7 that negative pole is connected with the emitter stage of audion VT5, positive pole is connected with the N pole of diode D13, negative
The Same Name of Ends of limit former with transformator T, pole inductance coil L2 is connected, positive pole after resistance R16 with the emitter stage phase of audion VT5
Polar capacitor C8, the N pole connected is connected with the grid of field effect transistor MOS, P pole after resistance R15 with the transmitting of audion VT5
The diode D7 that pole is connected, negative pole is connected with the drain electrode of field effect transistor MOS, positive pole is connected with the base stage of audion VT5
Polar capacitor C9, N pole colelctor electrode with audion VT5 after resistance R13 be connected, the colelctor electrode phase of P pole and audion VT1
The diode D6 connected, negative pole source electrode with field effect transistor MOS after resistance R12 is connected, positive pole after resistance R11 with two poles
The polar capacitor C10 that the P pole of pipe D6 is connected, and one end is connected with the positive pole of polar capacitor C10, the other end and transformator
The inductance L4 composition that the Same Name of Ends of T former limit inductance coil L1 is connected；The non-same polarity of described transformator T former limit inductance coil L1
Also the positive pole with polar capacitor C10 is connected, its Same Name of Ends is connected with the source electrode of field effect transistor MOS；Described audion VT4's
Grounded collector, its base stage are connected with the negative pole of polar capacitor C6, its emitter stage is connected with the negative pole of polar capacitor C7.
For the practical effect of the present invention, described control chip U2 the most preferentially uses the integrated chip of 3S44 to realize.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) the high transient state of input voltage and electric current can be adjusted by the present invention, prevents the frequency of electric current from drift occur, makes
Voltage and current held stationary, ensures that the present invention can export stable voltage and current；And the present invention can be to output
Voltage and circuit carry out over-voltage and over-current regulation, and can carry out wave energising pressure in output voltage and the unrestrained galvanization in output electric current
Suppression, makes the intensity of output voltage and electric current improve more than 40%, thus effectively raises the load capacity of the present invention.
(2) present invention can effectively improve resistance to pressure and the dynamic range of input voltage, and can be by the centre zero of electric current
Point skew controls within 0.3nA, thus improves load capacity of the present invention.
(3) present invention can effectively reduce Leakage Current and the loss current of output electric current, and can suppress to export electric current
Unusual fluctuations, and the output frequency of pulse of electric current, pulsewidth can be adjusted, make output electric current keep stable, so that it is guaranteed that
The stability of the output electric current of the present invention, improves the load capacity of the present invention simultaneously.
(4) the control chip U2 of the present invention uses the integrated chip of 3S44 to realize, and this chip is tied mutually with external circuit
Close and effectively raise output voltage of the present invention and the stability of 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 current detection circuit of the present invention.
Fig. 3 is the electrical block diagram of the comparison amplifying 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 embodiments of the present invention are not
It is limited to this.
Embodiment
As it is shown in figure 1, the present invention is mainly by control chip U2, diode rectifier U1, transformator T, audion VT1, P pole
The Zener diode that base stage with audion VT1 is connected after resistance R2, N pole is connected with the VCC pin of control chip U2
D1, positive pole is connected with the cathode output end of diode rectifier U1, the cathode output end phase of negative pole and diode rectifier U1
The polar capacitor C1 of ground connection after connection, positive pole cathode output end with diode rectifier U1 after resistance R1 is connected, negative pole
Polar capacitor C2, the P pole of ground connection is connected with the VREF pin of control chip U2, N pole after resistance R3 with control chip U2's
The diode D2 that RC pin is connected, positive pole is connected with the Same Name of Ends of transformator T secondary inductance coil L3, negative pole and transformator
After the non-same polarity of T secondary inductance coil L3 is connected, polar capacitor C11, the P pole of ground connection is connected with the positive pole of polar capacitor C11
Connect, the non-same polarity of N pole and transformator T secondary inductance coil L3 is collectively forming the Zener diode D9 of outfan, one end and change
The non-same polarity of depressor T former limit inductance coil L2 is connected, the resistance R14 of other end ground connection, is serially connected in diode rectifier U1
Cathode output end and the emitter stage of audion VT1 between comparison amplifying circuit, respectively with the COMP pin of control chip U2
The voltage-regulating circuit being connected with VFB pin and IS pin, respectively with colelctor electrode and the voltage-regulating circuit of audion VT1
The constant pressure and flow drive circuit being connected, and be serially connected between the OUT pin of control chip U2 and constant pressure and flow drive circuit
Current detection circuit composition.
The Same Name of Ends of described constant pressure and flow drive circuit also former with transformator T limit inductance coil L1 and non-same polarity and electricity
The Same Name of Ends of sense coil L2 is connected；The GND pin ground connection of described control chip U2, its IS pin are connected with RC pin；Institute
Two inputs stating diode rectifier U1 are collectively forming the input of the present invention and are connected with external power source.For this
Bright practical effect, described control chip U2 the most preferentially uses the integrated chip of 3S44 to realize.
Further, described voltage-regulating circuit by audion VT2, audion VT3, resistance R4, resistance R5, resistance R6,
Resistance R7, resistance R8, resistance R9, adjustable resistance R10, polar capacitor C3, polar capacitor C4, polar capacitor C5, polar capacitor C6,
Diode D3, diode D4, and diode D5 form.
During connection, the P pole of diode D3 COMP pin with control chip U2 after resistance R4 is connected, its N pole then warp
After resistance R, the colelctor electrode with audion VT2 is connected.The positive pole of polar capacitor C3 after resistance R6 with the VFB of control chip U2
Pin is connected, its negative pole then ground connection.The N pole of diode D4 is connected with the emitter stage of audion VT3, its P pole is then through resistance
After R8, the emitter stage with audion VT2 is connected.
Wherein, the negative pole of polar capacitor C4 be connected with the P pole of diode D4, its positive pole then with the base stage of audion VT2
It is connected.One end of resistance R7 is connected with the positive pole of polar capacitor C3, its other end is then connected with the N pole of diode D4.
The positive pole of polar capacitor C5 is connected with the emitter stage of audion VT2, its negative pole then after resistance R9 with the transmitting of audion VT3
Pole is connected.
Meanwhile, the N pole of diode D5 be connected with the IS pin of control chip U2, its P pole then with the transmitting of audion VT3
Pole is connected.The positive pole of polar capacitor C6 base stage with audion VT3 after adjustable resistance R10 is connected, its negative pole then with perseverance
Pressure constant-current drive circuit is connected.The base stage of described audion VT3 is connected with the RC pin of control chip U2, its colelctor electrode with
The positive pole of polar capacitor C3 is connected.
Further, described constant pressure and flow drive circuit is by audion VT4, audion VT5, field effect transistor MOS, resistance
R11, resistance R12, resistance R13, resistance R14, resistance R15, resistance R16, adjustable resistance R17, resistance R18, resistance R19, polarity
Electric capacity C7, polar capacitor C8, polar capacitor C9, polar capacitor C10, diode D6, diode D7, diode D8, and inductance
L4 forms.
During connection, the N pole of diode D8 colelctor electrode with audion VT4 after resistance R19 is connected, its P pole is then through electricity
After resistance R18, the Same Name of Ends of limit inductance coil L2 former with transformator T is connected.One end of adjustable resistance R17 and the P pole of diode D8
Be connected, its other end is then connected with the drain electrode of field effect transistor MOS.The negative pole of polar capacitor C7 and the transmitting of audion VT5
Pole is connected, its positive pole is then connected with the N pole of diode D13.
Wherein, the Same Name of Ends of the negative pole of polar capacitor C8 limit former with transformator T inductance coil L2 be connected, its positive pole then warp
After resistance R16, the emitter stage with audion VT5 is connected.Diode D7N pole be connected with the grid of field effect transistor MOS, its P
Pole then after resistance R15 emitter stage with audion VT5 be connected.The negative pole of polar capacitor C9 and the drain electrode of field effect transistor MOS
Be connected, its positive pole then base stage with audion VT5 is connected.
Meanwhile, the N pole of diode D6 colelctor electrode with audion VT5 after resistance R13 be connected, its P pole then with three poles
The colelctor electrode of pipe VT1 is connected.The negative pole of polar capacitor C10 source electrode with field effect transistor MOS after resistance R12 is connected, it
Positive pole then after resistance R11 P pole with diode D6 be connected.One end of inductance L4 is connected with the positive pole of polar capacitor C10,
The Same Name of Ends of its other end then limit inductance coil L1 former with transformator T is connected.
The non-same polarity of described transformator T former limit inductance coil L1 is also connected with the positive pole of polar capacitor C10, it is of the same name
End is connected with the source electrode of field effect transistor MOS；The grounded collector of described audion VT4, its base stage are negative with polar capacitor C6's
Pole is connected, its emitter stage is connected with the negative pole of polar capacitor C7.
As in figure 2 it is shown, described current detection circuit is by amplifier P, audion VT6, audion VT7, resistance R20, resistance
R21, resistance R22, resistance R23, adjustable resistance R24, resistance R25, resistance R26, resistance R27, inductance L5, polar capacitor C12, pole
Property electric capacity C13, polar capacitor C14, polar capacitor C15, diode D10, diode D11, diode D12, and diode D13
Composition.
During connection, the P pole of diode D10 positive pole with amplifier P after resistance R23 is connected, its N pole then with control core
The OUT pin of sheet U2 is connected.The positive pole of polar capacitor C12 N pole with diode D10 after resistance R20 is connected, its negative pole
Then ground connection.The positive pole of polar capacitor C13 is connected with the P pole of diode D10, its negative pole then after resistance R21 with audion VT6
Base stage be connected.
Wherein, the P pole of diode D11 positive pole with polar capacitor C13 after resistance R22 be connected, its N pole then with three poles
The emitter stage of pipe VT6 is connected.The positive pole of polar capacitor C15 positive pole with amplifier P after resistance R25 is connected, its negative pole
Then after resistance R26, outfan with amplifier P is connected.The P pole of diode D12 after resistance R27 with polar capacitor C15's
Negative pole is connected, its N pole then negative pole with amplifier P is connected.One end of adjustable resistance R24 and the emitter stage of audion VT6
Be connected, its other end then colelctor electrode with audion VT7 is connected.
Meanwhile, the N pole of diode D13 be connected with the negative pole of polar capacitor C15, its P pole then with the base stage of audion VT7
It is connected.The negative pole of polar capacitor C14 is connected with the colelctor electrode of audion VT7, its positive pole then with the colelctor electrode of audion VT6
It is connected.One end of inductance L5 is connected with the colelctor electrode of audion VT6, its other end then with the colelctor electrode phase of audion VT7
Connect.The negative pole of described amplifier P is connected with the adjustable end of adjustable resistance R24；The minus earth of described audion VT6；Institute
The N pole stating diode D13 is connected with constant pressure and flow drive circuit.
As it is shown on figure 3, the described amplifying circuit that compares is by audion VT8, audion VT9, field effect transistor MOS2, resistance R28,
Resistance R29, resistance R30, resistance R31, resistance R32, resistance R33, resistance R34, adjustable resistance R35, adjustable resistance R36, resistance
R37, polar capacitor C16, polar capacitor C17, polar capacitor C18 polar capacitor C19, polar capacitor C20, diode D14, two poles
Pipe D15, Zener diode D16, and diode D17 form.
During connection, the positive pole of polar capacitor C16 grid with field effect transistor MOS2 after resistance R29 is connected, its negative pole
Then the cathode output end with diode rectifier U1 is connected.The negative pole of polar capacitor C19 is connected with the base stage of audion VT8
Connect, its positive pole then after resistance R28 positive pole with polar capacitor C16 be connected.The positive pole of polar capacitor C17 is after resistance R30
Be connected with the positive pole of polar capacitor C16, its negative pole then ground connection.
Wherein, the drain electrode with field effect transistor MOS2 after resistance R31 of the positive pole of polar capacitor C18 be connected, its negative pole then
Ground connection.The P pole of diode D14 colelctor electrode with audion VT8 after resistance R33 is connected, its N pole then with field effect transistor MOS2
Source electrode be connected.One end of adjustable resistance R35 is connected with the emitter stage of audion VT8, its other end then with audion VT9
Colelctor electrode be connected after ground connection.Be connected with the drain electrode of field effect transistor MOS2 after P electrode resistance R32 of diode D15, its N pole
Then it is connected with the adjustable end of adjustable resistance R35.
Meanwhile, the negative pole of polar capacitor C20 be connected with the base stage of audion VT9, its positive pole then after resistance R34 with three
The emitter stage of pole pipe VT8 is connected.The N pole of diode D17 emitter stage with audion VT9 after resistance R37 is connected, its P
Pole then after adjustable resistance R36 colelctor electrode with audion VT8 be connected.The P pole of Zener diode D16 is with audion VT8's
Colelctor electrode is connected, its N pole then emitter stage with audion VT1 is connected.
During operation, the high transient state of input voltage and electric current can be adjusted by the present invention, prevents the frequency of electric current from drift occur
Move, make voltage and current held stationary, ensure that the present invention can export stable voltage and current；And the present invention can be right
Output voltage and circuit carry out over-voltage and over-current regulation, and can be to wave energising pressure in output voltage and the unrestrained galvanization in output electric current
Suppress, make the intensity of output voltage and electric current improve more than 40%, thus effectively raise the load energy of the present invention
Power.The present invention can effectively improve resistance to pressure and the dynamic range of input voltage, and can be by the middle zero migration control of electric current
System is within 0.3nA, thus improves load capacity of the present invention.
Meanwhile, the present invention can effectively reduce Leakage Current and the loss current of output electric current, and can suppress to export electric current
Unusual fluctuations, and the output frequency of pulse of electric current, pulsewidth can be adjusted, make output electric current keep stable, thus really
Protect the stability of the output electric current of the present invention, improve the load capacity of the present invention simultaneously.The control chip U2 of the present invention adopts
Realize with the integrated chip of 3S44, and this chip combines with external circuit and effectively raises output voltage of the present invention and electricity
The stability of stream and reliability.
According to above-described embodiment, can well realize the present invention.
Claims (6)
1. a comparison amplifying type LED power supply based on current detection circuit, it is characterised in that main by control chip
U2, diode rectifier U1, transformator T, audion VT1, P pole base stage with audion VT1 after resistance R2 is connected, N pole
The Zener diode D1 being connected with the VCC pin of control chip U2, the cathode output end phase of positive pole and diode rectifier U1
Connect, negative pole be connected with the cathode output end of diode rectifier U1 after the polar capacitor C1 of ground connection, positive pole is after resistance R1
Be connected with the cathode output end of diode rectifier U1, the VREF of polar capacitor C2, the P pole of minus earth and control chip U2
The diode D2 that pin is connected, N pole is connected with the RC pin of control chip U2 after resistance R3, positive pole is secondary with transformator T
Ground connection after the Same Name of Ends of limit inductance coil L3 is connected, negative pole is connected with the non-same polarity of transformator T secondary inductance coil L3
Polar capacitor C11, P pole be connected with the positive pole of polar capacitor C11, N pole non-of the same name with transformator T secondary inductance coil L3's
End is collectively forming the Zener diode D9 of outfan, and the non-same polarity of limit former with transformator T, one end inductance coil L2 is connected, separately
The resistance R14 of one end ground connection, the ratio being serially connected between the cathode output end of diode rectifier U1 and the emitter stage of audion VT1
Relatively amplifying circuit, the voltage-regulating circuit being connected with the COMP pin of control chip U2 and VFB pin and IS pin respectively,
The constant pressure and flow drive circuit being connected with colelctor electrode and the voltage-regulating circuit of audion VT1 respectively, and it is serially connected in control
Current detection circuit composition between OUT pin and the constant pressure and flow drive circuit of chip U2；Described constant pressure and flow drive circuit
Also former with the transformator T Same Name of Ends of limit inductance coil L1 and the Same Name of Ends of non-same polarity and inductance coil L2 are connected；Described
The GND pin ground connection of control chip U2, its IS pin are connected with RC pin.
A kind of comparison amplifying type LED power supply based on current detection circuit the most according to claim 1, its feature
Being, the described amplifying circuit that compares is imitated with field after resistance R29 by audion VT8, audion VT9, field effect transistor MOS2, positive pole
Should the polar capacitor C16 that grid is connected, negative pole is connected with the cathode output end of diode rectifier U1 of pipe MOS2, negative pole
Be connected with the base stage of audion VT8, polar capacitor that positive pole positive pole with polar capacitor C16 after resistance R28 is connected
C19, positive pole positive pole with polar capacitor C16 after resistance R30 is connected, the polar capacitor C17 of minus earth, and positive pole is through resistance
After R31 the drain electrode with field effect transistor MOS2 be connected, polar capacitor C18, the P pole of minus earth after resistance R33 with audion
The diode D14 that the colelctor electrode of VT8 is connected, N pole is connected with the source electrode of field effect transistor MOS2, one end is with audion VT8's
After emitter stage is connected, the other end is connected with the colelctor electrode of audion VT9 after adjustable resistance R35, P electrode resistance R32 of ground connection
Be connected with the drain electrode of field effect transistor MOS2, diode D15 that N pole is connected with the adjustable end of adjustable resistance R35, negative pole and three
Polar capacitor C20, the N pole that the base stage of pole pipe VT9 is connected, positive pole emitter stage with audion VT8 after resistance R34 is connected
After resistance R37 the emitter stage with audion VT9 be connected, P pole after adjustable resistance R36 with the colelctor electrode phase of audion VT8
The diode D17 connected, and P pole is connected with the colelctor electrode of audion VT8, N pole is connected with the emitter stage of audion VT1
Zener diode D16 composition.
A kind of comparison amplifying type LED power supply based on current detection circuit the most according to claim 2, its feature
Be, described current detection circuit by amplifier P, audion VT6, audion VT7, P pole after resistance R23 with amplifier P's
The diode D10 that positive pole is connected, N pole is connected with the OUT pin of control chip U2, positive pole after resistance R20 with diode
The N pole of D10 is connected, the polar capacitor C12 of minus earth, and positive pole is connected with the P pole of diode D10, negative pole is through resistance R21
Polar capacitor C13, the P pole that base stage with audion VT6 is connected afterwards positive pole with polar capacitor C13 after resistance R22 is connected
Connect, diode D11 that N pole is connected with the emitter stage of audion VT6, positive pole positive pole with amplifier P after resistance R25 is connected
Connect, polar capacitor C15, P pole that negative pole outfan with amplifier P after resistance R26 is connected after resistance R27 with polarity electricity
Hold the emitter stage of the diode D12 that negative pole is connected, N pole is connected of C15, one end and audion VT6 with the negative pole of amplifier P
Be connected, the negative pole phase of adjustable resistance R24, N pole that the other end is connected with the colelctor electrode of audion VT7 and polar capacitor C15
The diode D13 that connection, P pole are connected with the base stage of audion VT7, negative pole is connected with the colelctor electrode of audion VT7, positive pole
The polar capacitor C14 being connected with the colelctor electrode of audion VT6, and one end is connected with the colelctor electrode of audion VT6, another
The inductance L5 composition that end is connected with the colelctor electrode of audion VT7；The negative pole of described amplifier P is adjustable with adjustable resistance R24's
End is connected；The minus earth of described audion VT6；The N pole of described diode D13 is connected with constant pressure and flow drive circuit.
A kind of comparison amplifying type LED power supply based on current detection circuit the most according to claim 3, its feature
Being, described voltage-regulating circuit is by audion VT2, and audion VT3, P pole is managed with the COMP of control chip U2 after resistance R4
The diode D3 that foot is connected, N pole colelctor electrode with audion VT2 after resistance R is connected, positive pole after resistance R6 with control
The VFB pin of chip U2 is connected, polar capacitor C3, the N pole of minus earth is connected with the emitter stage of audion VT3, P pole warp
The diode D4 that after resistance R8, emitter stage with audion VT2 is connected, negative pole is connected with the P pole of diode D4, positive pole with
The polar capacitor C4 that the base stage of audion VT2 is connected, one end is connected with the positive pole of polar capacitor C3, the other end and diode
The resistance R7 that the N pole of D4 is connected, positive pole is connected with the emitter stage of audion VT2, negative pole after resistance R9 with audion VT3
Polar capacitor C5, the N pole that is connected of emitter stage be connected with the IS pin of control chip U2, the transmitting of P pole and audion VT3
The diode D5 that pole is connected, and positive pole base stage with audion VT3 after adjustable resistance R10 is connected, negative pole and constant voltage
The polar capacitor C6 composition that constant-current drive circuit is connected；The RC pin phase of the base stage of described audion VT3 and control chip U2
Connect, its colelctor electrode is connected with the positive pole of polar capacitor C3.
A kind of comparison amplifying type LED power supply based on current detection circuit the most according to claim 4, its feature
Be, described constant pressure and flow drive circuit by audion VT4, audion VT5, field effect transistor MOS, N pole after resistance R19 with three
The colelctor electrode of pole pipe VT4 is connected, after resistance R18, the Same Name of Ends of limit inductance coil L2 former with transformator T is connected in P pole two
Pole pipe D8, the adjustable resistance that P pole is connected, the other end is connected with the drain electrode of field effect transistor MOS of one end and diode D8
R17, the polar capacitor C7 that negative pole is connected with the emitter stage of audion VT5, positive pole is connected with the N pole of diode D13, negative pole
The Same Name of Ends of limit inductance coil L2 former with transformator T is connected, positive pole emitter stage with audion VT5 after resistance R16 is connected
Polar capacitor C8, the N pole connect is connected with the grid of field effect transistor MOS, P pole after resistance R15 with the emitter stage of audion VT5
The diode D7 being connected, negative pole is connected with the drain electrode of field effect transistor MOS, positive pole is connected with the base stage of audion VT5
Polar capacitor C9, N pole colelctor electrode with audion VT5 after resistance R13 is connected, P pole is connected with the colelctor electrode of audion VT1
The diode D6 connect, negative pole source electrode with field effect transistor MOS after resistance R12 is connected, positive pole after resistance R11 with diode
The polar capacitor C10 that the P pole of D6 is connected, and one end is connected with the positive pole of polar capacitor C10, the other end and transformator T
The inductance L4 composition that the Same Name of Ends of former limit inductance coil L1 is connected；The non-same polarity of described transformator T former limit inductance coil L1
Also the positive pole with polar capacitor C10 is connected, its Same Name of Ends is connected with the source electrode of field effect transistor MOS；Described audion VT4's
Grounded collector, its base stage are connected with the negative pole of polar capacitor C6, its emitter stage is connected with the negative pole of polar capacitor C7.
A kind of comparison amplifying type LED power supply based on current detection circuit the most according to claim 5, its feature
Being, described control chip U2 is the integrated chip of 3S44.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610565672.6A CN106211437A (en) | 2016-07-18 | 2016-07-18 | A kind of comparison amplifying type LED power supply based on current detection circuit |
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| CN201610565672.6A CN106211437A (en) | 2016-07-18 | 2016-07-18 | A kind of comparison amplifying type LED power supply based on current detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108112129A (en) * | 2018-01-10 | 2018-06-01 | 生迪智慧科技有限公司 | Constant current driver circuit for LED |
| CN113438768A (en) * | 2021-06-03 | 2021-09-24 | 浙江阳光照明电器集团股份有限公司 | Lamp strip adapter for high-voltage LED flexible lamp strip |
-
2016
- 2016-07-18 CN CN201610565672.6A patent/CN106211437A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108112129A (en) * | 2018-01-10 | 2018-06-01 | 生迪智慧科技有限公司 | Constant current driver circuit for LED |
| CN108112129B (en) * | 2018-01-10 | 2023-12-12 | 生迪智慧科技有限公司 | LED constant current driving circuit |
| CN113438768A (en) * | 2021-06-03 | 2021-09-24 | 浙江阳光照明电器集团股份有限公司 | Lamp strip adapter for high-voltage LED flexible lamp strip |
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