CN105873298A - LED (light emitting diode) switch voltage stabilizing driving power supply based on constant current driving circuit - Google Patents
LED (light emitting diode) switch voltage stabilizing driving power supply based on constant current driving circuit Download PDFInfo
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- CN105873298A CN105873298A CN201610397138.9A CN201610397138A CN105873298A CN 105873298 A CN105873298 A CN 105873298A CN 201610397138 A CN201610397138 A CN 201610397138A CN 105873298 A CN105873298 A CN 105873298A
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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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Abstract
The invention discloses an LED (light emitting diode) switch voltage stabilizing driving power supply based on a constant current driving circuit. The LED switch voltage stabilizing driving power supply is characterized by mainly consisting of a control chip U2, a diode rectifier U1, a transformer T, a triode VT1, a diode D1, a primary flyback circuit, an operation amplification circuit, a current regulating circuit, a constant current driving circuit and the like, wherein the current regulating circuit is connected in series between a pole P of the diode D1 and the non-homonymous end of a primary edge inductive coil L1 of the transformer T; the constant current driving circuit is respectively connected with the transformer T and the primary flyback circuit. The LED switch voltage stabilizing driving power supply has the advantages that the current peak can be controlled to be constant; meanwhile, the duty factor of the switch is controlled; the time proportion of the whole switch period of the output is enabled to be constant, so that the constancy of the output current is realized. The LED switch voltage stabilizing driving power supply only needs 0.5muA of starting current, so that the starting power consumption is reduced; the efficiency of the power supply is higher than 80 percent; the no-load power consumption is lower than 30mW, so that the efficiency of the power supply is improved.
Description
Technical field
The present invention relates to electronic applications, specifically, be that a kind of LED switch based on constant-current drive circuit is steady
Pressure drives power supply.
Background technology
Under the background that global energy shortage, environmental requirement improve constantly, green is all greatly developed in countries in the world
Energy-saving illumination.LED illumination, as a kind of revolutionary energy-saving illumination technology, develops rapidly, simultaneously people
To LED switch drive power supply requirement also improving constantly.But, existing LED switch drives power supply
There is the defect that efficiency is low, power factor is low, current control accuracy is the highest and reliability is low in circuit, from
And existing LED switch drive power circuit cannot meet the requirement of people.
Therefore it provides one can improve efficiency, power factor, can ensure that again the LED of current control accuracy
Switch voltage-stabilizing drives power supply to be the task of top priority.
Summary of the invention
It is an object of the invention to overcome LED switch of the prior art drive power circuit exist efficiency low,
Power factor is low, and the defect that current control accuracy is the highest, it is provided that a kind of based on constant-current drive circuit
LED switch voltage stabilizing drives power supply.
The present invention is achieved through the following technical solutions: a kind of LED switch based on constant-current drive circuit is steady
Pressure drives power supply, mainly by control chip U2, diode rectifier U1, transformer T, triode VT1,
Positive pole is connected with the cathode output end of diode rectifier U1, the positive pole of negative pole and diode rectifier U1
The polar capacitor C1 that output is connected, one end is connected with the base stage of triode VT1, the other end and polarity
The resistance R1 that the negative pole of electric capacity C1 is connected, positive pole after resistance R2 with the positive pole of diode rectifier U1
The polar capacitor C2 that output is connected, negative pole is connected with the S pin of control chip U2 after resistance R3,
N pole colelctor electrode with triode VT1 after thermistor RT is connected, P pole after resistance R4 with control
The diode D1 that the D pin of chip U2 is connected, the P pole being serially connected in diode D1 is former with transformer T
Current regulating circuit between the non-same polarity of limit inductance coil L1, respectively with the C pin of control chip U2
The one-level reverse excitation circuit being connected with S pin, is serially connected in the non-of the same name of transformer T former limit inductance coil L2
Hold with one-level reverse excitation circuit between operational amplification circuit, and respectively with transformer T and one-level inverse-excitation type
The constant-current drive circuit composition that circuit is connected；The Same Name of Ends and three of described transformer T former limit inductance coil L1
The colelctor electrode of pole pipe VT1 is connected；The emitter stage of described triode VT1 is negative with diode rectifier U1's
Pole output is connected；The Same Name of Ends ground connection of described transformer T former limit inductance coil L2；Described transformer T
Secondary inductance coil L3 is connected with constant-current drive circuit.
Described current regulating circuit is by amplifier P2, amplifier P3, triode VT5, triode VT6, P
Pole is connected with the negative input of amplifier P2, the diode D9 of N pole ground connection, and negative pole is through resistance R26
Be connected with the N pole of diode D9 afterwards, positive pole after resistance R27 with the electrode input end phase of amplifier P2
Polar capacitor C13, the P pole connected positive pole with polar capacitor C13 after resistance R28 is connected, N pole
The diode D10 being connected with the emitter stage of triode VT5, positive pole is connected with the colelctor electrode of triode VT5
Connect, polar capacitor C14, the P pole of minus earth is connected with the negative input of amplifier P3, N pole warp
The diode D11 that after resistance R31, base stage with triode VT6 is connected, positive pole after resistance R33 with three
The pole that the base stage of pole pipe VT6 is connected, negative pole emitter stage with triode VT6 after resistance R32 is connected
Property electric capacity C2, one end is connected with the negative input of amplifier P3, the resistance R30 of other end ground connection, with
And the pole that positive pole is connected with the output of amplifier P3, negative pole is connected with the adjustable end of adjustable resistance R31
Property electric capacity C15 composition；The grounded collector of described triode VT6；The output of described amplifier P2 with
The base stage of triode VT5 is connected；The positive pole of described polar capacitor C16 and transformer T former limit inductance coil
The non-same polarity of L1 is connected；The negative pole of described polar capacitor C13 is connected with the P pole of diode D1.
Described operational amplification circuit is by amplifier P1, triode VT3, and triode VT4, positive pole is through resistance
After R16 the electrode input end with amplifier P1 be connected, negative pole as operational amplification circuit input and with
Polar capacitor C9, the P pole that one-level reverse excitation circuit is connected after resistance R17 with polar capacitor C9 just
The diode D6 that pole is connected, N pole negative input with amplifier P1 after resistance R19 is connected,
Negative pole is connected with the base stage of triode VT3, positive pole inputs with the negative pole of amplifier P1 after resistance R18
The polar capacitor C11 that is connected of end, positive pole is connected with the N pole of diode D6, negative pole is through resistance R20
The polar capacitor C12 that base stage with triode VT4 is connected afterwards, positive pole is connected with the output of amplifier P1
Connect, polar capacitor C10, N pole warp that negative pole colelctor electrode with triode VT3 after resistance R24 is connected
After resistance R23 the negative pole with polar capacitor C10 be connected, P pole after resistance R21 with amplifier P1 just
The Zener diode D7 that electrode is connected, one end is connected with the output of amplifier P1, the other end and three
The resistance R22 that the emitter stage of pole pipe VT3 is connected, and P pole after resistance R25 with triode VT3
Colelctor electrode be connected, the diode D8 of N pole ground connection composition；The grounded collector of described triode VT4,
Its emitter stage is connected with the colelctor electrode of triode VT3；The negative electrode ground connection of described amplifier P1；Described two
The N pole of pole pipe D8 is connected with the colelctor electrode of triode VT3；The negative pole conduct of described polar capacitor C10
The output of operational amplification circuit the non-same polarity of limit inductance coil L2 former with transformer T are connected.
Described one-level reverse excitation circuit is connected with the negative pole of polar capacitor C10 by photoelectrical coupler IC, P pole,
The diode D2 that N pole is connected with first output of photoelectrical coupler IC after resistance R11, negative pole with
The N pole of diode D2 is connected, positive pole is connected with the C pin of control chip U2 after resistance R8
Polar capacitor C4, N pole is connected with the C pin of control chip U2, P pole after adjustable resistance R10 with
The diode D3 that second output of photoelectrical coupler IC is connected, one end is extremely connected with the N of diode D3
Connect, resistance R9 that the other end is connected with the S pin of control chip U2, minus earth, positive pole and control
The polar capacitor C3 that the S pin of chip U2 is connected, and first input of positive pole and photoelectrical coupler IC
End is connected, the polar capacitor C5 of minus earth composition；The second input termination of described photoelectrical coupler IC
Ground；The first input end of described photoelectrical coupler IC as the input of one-level reverse excitation circuit and drives with constant current
Dynamic circuit is connected.
Described constant-current drive circuit is by triode VT2, and positive pole is non-with transformer T secondary inductance coil L3's
The polar capacitor C7 that Same Name of Ends is connected, negative pole emitter stage with triode VT2 after resistance R6 is connected,
N pole emitter stage with triode VT2 after resistance R5 is connected, P pole after polar capacitor C6 with transformation
The base stage of the diode D4 that the Same Name of Ends of device T secondary inductance coil L3 is connected, one end and triode VT2
Be connected, resistance R7, N pole warp that the other end is connected with the tap of transformer T secondary inductance coil L3
After inductance L4, the emitter stage with triode VT2 is connected, N pole is sequentially after resistance R13 and resistance R12
The Zener diode D5 being connected with the first input end of photoelectrical coupler IC, positive pole and Zener diode D5
The polar capacitor that N pole is connected, negative pole colelctor electrode with triode VT2 after resistance R14 is connected
C8, and one end is connected with the emitter stage of triode VT2, the colelctor electrode phase of the other end and triode VT2
The resistance R15 composition connected；The grounded collector of described triode VT2；Described polar capacitor C11's is negative
Pole is connected with the Same Name of Ends of transformer T secondary inductance coil L3；The negative pole of described polar capacitor C8 with just
Pole is collectively forming the output of constant-current drive circuit.
For the practical effect of the present invention, described control chip U2 the most preferentially uses TOP224Y integrated
Chip realizes.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) to control current peak constant for the present invention, controls duty cycle of switching simultaneously, keeps that output is whole opens
Close proportions constant cycle time, thus present invention achieves the constant of output electric current.
(2) electric current can be adjusted by the present invention, and the present invention only needs the starting current of 0.5 μ A, i.e. reduces
The power consumption started, makes the efficiency of the present invention more than 80%, and no-load power consumption is less than 30mW, thus improves
The efficiency of the present invention.
(3) control chip of the present invention have employed the integrated chip of TOP224Y and realizes, this TOP224Y collection
Become chip constant current accuracy high, and output current error < 2%, thus improve the precision that electric current is controlled by the present invention.
(4) drive efficiency of the present invention is high, and full load efficiency the most of the present invention is up to more than 90%.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the electrical block diagram of operational amplification circuit of the present invention.
Fig. 3 is the electrical block diagram of the current regulating 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, diode rectifier U1, transformer T,
Triode VT1, resistance R1, resistance R2, resistance R3, resistance R4, thermistor RT, polar capacitor
C1, polar capacitor C2, diode D1, current regulating circuit, operational amplification circuit, one-level inverse-excitation type electricity
Road, and constant-current drive circuit composition.
During enforcement, 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.One end of resistance R1 is with triode VT1's
Base stage is connected, its other end is connected with the negative pole of polar capacitor C1.The positive pole of polar capacitor C2 is through electricity
Resistance R2 after be connected with the cathode output end of diode rectifier U1, its negative pole after resistance R3 with control
The S pin of chip U2 is connected.The N pole of diode D1 after thermistor RT with triode VT1's
Colelctor electrode is connected, its P pole D pin with control chip U2 after resistance R4 is connected.Electric current regulates
Circuit is serially connected between the P pole of diode D1 and the non-same polarity of transformer T former limit inductance coil L1.Fortune
Calculate amplifying circuit be serially connected in the non-same polarity of transformer T former limit inductance coil L2 and one-level reverse excitation circuit it
Between.One-level reverse excitation circuit is connected with C pin and the S pin of control chip U2 respectively.Constant current drives
Circuit is connected with transformer T and one-level reverse excitation circuit respectively.
The Same Name of Ends of described transformer T former limit inductance coil L1 is connected with the colelctor electrode of triode VT1；
The Same Name of Ends ground connection of described transformer T former limit inductance coil L2；The emitter stage and two of described triode VT1
The cathode output end of pole pipe rectifier U1 is connected；Described transformer T secondary inductance coil L3 drives with constant current
Dynamic circuit is connected；The input of described diode rectifier U1 is connected with external power source.
Wherein, described one-level reverse excitation circuit is by photoelectrical coupler IC, resistance R8, resistance R9, adjustable electric
Resistance R10, resistance R11, polar capacitor C3, polar capacitor C4, polar capacitor C5, diode D2, with
And diode D3 composition.
During connection, the P pole of diode D2 is connected with the negative pole of polar capacitor C10, its N pole is through resistance
After R11, the first output with photoelectrical coupler IC is connected.The negative pole of polar capacitor C4 and diode D2
N pole be connected, its positive pole C pin with control chip U2 after resistance R8 is connected.Diode
The N pole of D3 is connected with the C pin of control chip U2, its P pole after adjustable resistance R10 with light thermocouple
Second output of clutch IC is connected.
Meanwhile, one end of resistance R9 be connected with the N pole of diode D3, its other end and control chip
The S pin of U2 is connected.The S pipe of the minus earth of polar capacitor C3, its positive pole and control chip U2
Pin is connected.The positive pole of polar capacitor C5 is connected with the first input end of photoelectrical coupler IC, its negative pole
Ground connection.Second input end grounding of described photoelectrical coupler IC；First input of described photoelectrical coupler IC
End as the input of one-level reverse excitation circuit and is connected with constant-current drive circuit.
Further, described constant-current drive circuit by triode VT2, resistance R5, resistance R6, resistance R7,
Resistance R12, resistance R13, resistance R14, resistance R15, polar capacitor C6, polar capacitor C7, polarity
Electric capacity C8, diode D4, Zener diode D5, and inductance L4 form.
During connection, the positive pole of polar capacitor C7 is connected with the non-same polarity of transformer T secondary inductance coil L3
Connect, its negative pole emitter stage with triode VT2 after resistance R6 is connected.The P pole of diode D4 and pole
Property electric capacity C6 positive pole be connected, the negative pole of described polar capacitor C6 and transformer T secondary inductance coil L3
Same Name of Ends be connected, the N pole of described diode D4 after resistance R5 with the emitter stage of triode VT2
It is connected.One end of resistance R7 is connected with the base stage of triode VT2, its other end is secondary with transformer T
The tap of limit inductance coil L3 is connected.
Wherein, the N pole of Zener diode D5 emitter stage with triode VT2 after inductance L4 be connected,
Its N pole is sequentially connected through resistance R13 first input end with photoelectrical coupler IC after resistance R12.
The positive pole of polar capacitor C8 is connected with the N pole of Zener diode D5, its negative pole after resistance R14 with three
The colelctor electrode of pole pipe VT2 is connected.One end of resistance R15 is connected with the emitter stage of triode VT2, it
The other end is connected with the colelctor electrode of triode VT2.
The grounded collector of described triode VT2；The negative pole of described polar capacitor C11 is secondary with transformer T
The Same Name of Ends of limit inductance coil L3 is connected；The negative pole of described polar capacitor C8 and positive pole are collectively forming constant current
The output of drive circuit is also connected with LED group.
As in figure 2 it is shown, described operational amplification circuit is by amplifier P1, triode VT3, triode VT4,
Resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, resistance R21, resistance R22,
Resistance R23, resistance R24, resistance R25, polar capacitor C9, polar capacitor C10, polar capacitor C11,
Polar capacitor C12, diode D6, Zener diode D7, and diode D8 form.
During connection, the positive pole of polar capacitor C9 electrode input end with amplifier P1 after resistance R16 is connected
Connect, its negative pole as the input of operational amplification circuit and is connected with one-level reverse excitation circuit.Diode D6
P pole positive pole with polar capacitor C9 after resistance R17 be connected, its N pole after resistance R19 with put
The negative input of big device P1 is connected.The negative pole of polar capacitor C11 is connected with the base stage of triode VT3
Connect, its positive pole negative input with amplifier P1 after resistance R18 is connected.Polar capacitor C12 is just
Pole is connected with the N pole of diode D6, its negative pole base stage with triode VT4 after resistance R20 is connected
Connect.
Meanwhile, the positive pole of polar capacitor C10 is connected with the output of amplifier P1, its negative pole is through resistance
After R24, the colelctor electrode with triode VT3 is connected.The N pole of Zener diode D7 after resistance R23 with
The negative pole of polar capacitor C10 is connected, its P pole positive electrode with amplifier P1 after resistance R21 is connected
Connect.One end of resistance R22 is connected with the output of amplifier P1, its other end and triode VT3
Emitter stage is connected.The P pole of diode D8 colelctor electrode with triode VT3 after resistance R25 is connected,
Its N pole ground connection.
The grounded collector of described triode VT4, its emitter stage are connected with the colelctor electrode of triode VT3；
The negative electrode ground connection of described amplifier P1；The N pole of described diode D8 and the colelctor electrode phase of triode VT3
Connect；The negative pole of described polar capacitor C10 is as the output of operational amplification circuit limit former with transformer T
The non-same polarity of inductance coil L2 is connected.
As it is shown on figure 3, described current regulating circuit is by amplifier P2, amplifier P3, triode VT5,
Triode VT6, resistance R26, resistance R27, resistance R28, resistance R29, resistance R30, adjustable resistance
R31, resistance R32, resistance R32, resistance R33, polar capacitor C13, polar capacitor C14, polarity electricity
Hold C15, polar capacitor C16, diode D9, diode D10, and diode D11 composition.
During connection, the P pole of diode D9 is connected with the negative input of amplifier P2, its N pole connects
Ground.The negative pole of polar capacitor C13 N pole with diode D9 after resistance R26 is connected, its positive pole warp
After resistance R27, the electrode input end with amplifier P2 is connected.The P pole of diode D10 is through resistance R28
Positive pole with polar capacitor C13 is connected afterwards, its N pole is connected with the emitter stage of triode VT5.Polarity
The positive pole of electric capacity C14 is connected with the colelctor electrode of triode VT5, its minus earth.
Wherein, the P pole of diode D11 is connected with the negative input of amplifier P3, its N pole is through electricity
It is connected with the base stage of triode VT6 after resistance R31.The positive pole of polar capacitor C2 after resistance R33 with three
The base stage of pole pipe VT6 is connected, its negative pole emitter stage with triode VT6 after resistance R32 is connected.
One end of resistance R30 is connected with the negative input of amplifier P3, its other end ground connection.Polar capacitor
The positive pole of C15 is connected with the output of amplifier P3, its negative pole is connected with the adjustable end of adjustable resistance R31
Connect.
The grounded collector of described triode VT6；The output of described amplifier P2 is with triode VT5's
Base stage is connected；The positive pole of described polar capacitor C16 and the non-same polarity of transformer T former limit inductance coil L1
It is connected；The negative pole of described polar capacitor C13 is connected with the P pole of diode D1.
During operation, it is constant that the present invention can control current peak, controls duty cycle of switching simultaneously, keeps output whole
Switch periods time scale is constant, thus present invention achieves the constant of output electric current.And the present invention only needs
The starting current of 0.5 μ A, i.e. reduces the power consumption of startup, makes the efficiency of the present invention be more than 80%, no-load power consumption
Less than 30mW, thus improve the efficiency of the present invention.Meanwhile, the drive efficiency of the present invention is high, i.e. this
Bright full load efficiency is up to more than 90%.
In order to preferably implement the present invention, described control chip have employed the integrated chip of TOP224Y and realizes,
This TOP224Y integrated chip constant current accuracy is high, exports current error < 2%.
According to above-described embodiment, can well realize the present invention.
Claims (6)
1. a LED switch voltage stabilizing based on constant-current drive circuit drives power supply, it is characterised in that main
By control chip U2, diode rectifier U1, transformer T, triode VT1, 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, one end is connected with the base stage of triode VT1, the negative pole phase of the other end and polar capacitor C1
The resistance R1 connected, positive pole cathode output end with diode rectifier U1 after resistance R2 is connected, negative
Polar capacitor C2, the N pole that pole is connected with the S pin of control chip U2 after resistance R3 is through thermistor
After RT, the colelctor electrode with triode VT1 is connected, P pole is managed with the D of control chip U2 after resistance R4
The diode D1 that pin is connected, is serially connected in P pole and the transformer T former limit inductance coil L1 of diode D1
Non-same polarity between current regulating circuit, be connected with C pin and the S pin of control chip U2 respectively
The one-level reverse excitation circuit connect, is serially connected in non-same polarity and the one-level flyback of transformer T former limit inductance coil L2
Operational amplification circuit between formula circuit, and be connected with transformer T and one-level reverse excitation circuit respectively
Constant-current drive circuit forms；The Same Name of Ends of described transformer T former limit inductance coil L1 is with triode VT1's
Colelctor electrode is connected；The emitter stage of described triode VT1 and the cathode output end phase of diode rectifier U1
Connect；The Same Name of Ends ground connection of described transformer T former limit inductance coil L2；Described transformer T secondary inductance line
Circle L3 is connected with constant-current drive circuit.
A kind of LED switch voltage stabilizing based on constant-current drive circuit the most according to claim 1 drives electricity
Source, it is characterised in that described current regulating circuit is by amplifier P2, amplifier P3, triode VT5, three
Pole pipe VT6, P pole is connected with the negative input of amplifier P2, the diode D9 of N pole ground connection, negative pole
After resistance R26 the N pole with diode D9 be connected, positive pole after resistance R27 with amplifier P2 just
Polar capacitor C13, the P pole that pole input is connected after resistance R28 with the positive pole phase of polar capacitor C13
The diode D10 that connection, N pole are connected with the emitter stage of triode VT5, positive pole is with triode VT5's
Colelctor electrode is connected, polar capacitor C14, the P pole of minus earth is connected with the negative input of amplifier P3
Connect, diode D11 that N pole base stage with triode VT6 after resistance R31 is connected, positive pole is through resistance
After R33 the base stage with triode VT6 be connected, negative pole after resistance R32 with the emitter stage of triode VT6
The polar capacitor C2 that is connected, one end is connected with the negative input of amplifier P3, other end ground connection
Resistance R30, and positive pole is connected with the output of amplifier P3, negative pole is adjustable with adjustable resistance R31's
The polar capacitor C15 composition that end is connected；The grounded collector of described triode VT6；Described amplifier P2
Output be connected with the base stage of triode VT5；The positive pole of described polar capacitor C16 is former with transformer T
The non-same polarity of limit inductance coil L1 is connected；The negative pole of described polar capacitor C13 and the P of diode D1
Pole is connected.
A kind of LED switch voltage stabilizing based on constant-current drive circuit the most according to claim 2 drives electricity
Source, it is characterised in that described operational amplification circuit by amplifier P1, triode VT3, triode VT4,
Positive pole electrode input end with amplifier P1 after resistance R16 is connected, negative pole is as operational amplification circuit
Input polar capacitor C9, the P pole being connected with one-level reverse excitation circuit are electric with polarity after resistance R17
The positive pole holding C9 is connected, N pole negative input with amplifier P1 after resistance R19 is connected two
Pole pipe D6, negative pole is connected with the base stage of triode VT3, positive pole after resistance R18 with amplifier P1's
The polar capacitor C11 that negative input is connected, positive pole is connected with the N pole of diode D6, negative pole is through electricity
The polar capacitor C12 being connected with the base stage of triode VT4 after resistance R20, positive pole is defeated with amplifier P1's
Go out the polar capacitor C10 that end is connected, negative pole colelctor electrode with triode VT3 after resistance R24 is connected,
N pole negative pole with polar capacitor C10 after resistance R23 is connected, P pole after resistance R21 with amplifier
The Zener diode D7 that the positive electrode of P1 is connected, one end is connected with the output of amplifier P1, another
The resistance R22 that is connected with the emitter stage of triode VT3 of end, and P pole after resistance R25 with triode
The colelctor electrode of VT3 is connected, the diode D8 of N pole ground connection composition；The colelctor electrode of described triode VT4
Ground connection, its emitter stage are connected with the colelctor electrode of triode VT3；The negative electrode ground connection of described amplifier P1；
The N pole of described diode D8 is connected with the colelctor electrode of triode VT3；Described polar capacitor C10's is negative
Pole is connected as the output of operational amplification circuit the non-same polarity of limit inductance coil L2 former with transformer T
Connect.
A kind of LED switch voltage stabilizing based on constant-current drive circuit the most according to claim 3 drives electricity
Source, it is characterised in that described one-level reverse excitation circuit is by photoelectrical coupler IC, P pole and polar capacitor C10
Two poles that negative pole is connected, N pole is connected with first output of photoelectrical coupler IC after resistance R11
Pipe D2, negative pole is connected with the N pole of diode D2, positive pole after resistance R8 with the C of control chip U2
Polar capacitor C4, the N pole that pin is connected is connected with the C pin of control chip U2, P pole is through adjustable
The diode D3 being connected with second output of photoelectrical coupler IC after resistance R10, one end and diode
The resistance R9 that the N pole of D3 is connected, the other end is connected with the S pin of control chip U2, minus earth,
The polar capacitor C3 that positive pole is connected with the S pin of control chip U2, and positive pole and photoelectrical coupler IC
First input end be connected, the polar capacitor C5 of minus earth composition；The of described photoelectrical coupler IC
Two input end groundings；The first input end of described photoelectrical coupler IC is as the input of one-level reverse excitation circuit
And be connected with constant-current drive circuit.
A kind of LED switch voltage stabilizing based on constant-current drive circuit the most according to claim 4 drives electricity
Source, it is characterised in that described constant-current drive circuit is by triode VT2, positive pole and transformer T secondary inductance
The non-same polarity of coil L3 is connected, negative pole emitter stage with triode VT2 after resistance R6 is connected
Polar capacitor C7, N pole emitter stage with triode VT2 after resistance R5 is connected, P pole is through polarity electricity
The diode D4 being connected with the Same Name of Ends of transformer T secondary inductance coil L3 after holding C6, one end and three poles
The electricity that the base stage of pipe VT2 is connected, the other end is connected with the tap of transformer T secondary inductance coil L3
Resistance R7, N pole emitter stage with triode VT2 after inductance L4 is connected, N pole is sequentially through resistance R13
The Zener diode D5 being connected with first input end with photoelectrical coupler IC after resistance R12, positive pole with
The N pole of Zener diode D5 is connected, negative pole colelctor electrode with triode VT2 after resistance R14 is connected
The polar capacitor C8 connect, and one end is connected with the emitter stage of triode VT2, the other end and triode
The resistance R15 composition that the colelctor electrode of VT2 is connected；The grounded collector of described triode VT2；Described pole
The property negative pole of electric capacity C11 is connected with the Same Name of Ends of transformer T secondary inductance coil L3；Described polar capacitor
The negative pole of C8 and positive pole are collectively forming the output of constant-current drive circuit.
A kind of LED switch voltage stabilizing based on constant-current drive circuit the most according to claim 5 drives electricity
Source, it is characterised in that described control chip U2 is the integrated chip of TOP224Y.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610397138.9A CN105873298A (en) | 2016-06-06 | 2016-06-06 | LED (light emitting diode) switch voltage stabilizing driving power supply based on constant current driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610397138.9A CN105873298A (en) | 2016-06-06 | 2016-06-06 | LED (light emitting diode) switch voltage stabilizing driving power supply based on constant current driving circuit |
Publications (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109976439A (en) * | 2019-04-29 | 2019-07-05 | 苏州市职业大学 | High efficiency can multi-path flow equalizing constant-current source circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109976439A (en) * | 2019-04-29 | 2019-07-05 | 苏州市职业大学 | High efficiency can multi-path flow equalizing constant-current source circuit |
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Application publication date: 20160817 |