CN106061031A - Multi-circuit processing type LED constant current driving power supply - Google Patents
Multi-circuit processing type LED constant current driving power supply Download PDFInfo
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- CN106061031A CN106061031A CN201610565634.0A CN201610565634A CN106061031A CN 106061031 A CN106061031 A CN 106061031A CN 201610565634 A CN201610565634 A CN 201610565634A CN 106061031 A CN106061031 A CN 106061031A
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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]
- H05B45/50—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 multi-circuit processing type LED constant current driving power supply which is characterized in that the multi-circuit processing type LED constant current driving power supply is mainly composed of a control chip U2, a diode rectifier U1, a triode VT1, a triode VT2, a polar capacitor C1, a polar capacitor C5, a diode D5, an overvoltage protection circuit, a surge voltage suppression circuit, a field effect constant current driving circuit and a current detection circuit which is connected in series between the DRV pin of the control chip U2 and the field effect constant current driving circuit. Transient high voltage of input voltage can be eliminated or suppressed, the voltage withstanding performance of voltage can be enhanced and middle null offset of current can be controlled so that output of stable voltage and current can be ensured, the stability of LED lamp brightness can be effectively ensured and the service life of the LED lamp can be effectively prolonged.
Description
Technical field
The present invention relates to electronic applications, specifically, be that a kind of many processing of circuit type LED constant current drives power supply.
Background technology
LED is as novel energy-conserving light source, with its environmental protection, the feature such as energy-conservation, life-span length, volume are little, wide by people
General receiving and employing.Owing to LED is the semiconductor device of characteristic sensitivity, there is again negative temperature characteristic, therefore in application process,
LED power plays considerable effect for promoting LED to be in stable duty.Currently used LED power is because being subject to
There is output voltage and the problem of electric current instability to extraneous Electromagnetic Interference, the brightness causing LED is unstable, thus
Have impact on the service life of LED.
Therefore it provides a kind of LED constant current 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 LED power of the prior art because being existed defeated by extraneous Electromagnetic Interference
Go out the defect that voltage and current is unstable, it is provided that one many processing of circuit type LED constant current drive power supply.
The present invention is achieved through the following technical solutions: a kind of many processing of circuit type LED constant current drives power supply, mainly by controlling
The cathode output end of coremaking sheet U2, diode rectifier U1, audion VT1, audion VT2, positive pole and diode rectifier U1
Be connected, polar capacitor C1 that negative pole is connected with the cathode output end of diode rectifier U1, the base of positive pole and audion VT1
Polar capacitor C5, the N pole that pole is connected, negative pole colelctor electrode with audion VT2 after resistance R7 is connected after resistance R11 with
The diode D5 that the DRV pin of control chip U2 is connected, P pole base stage with audion VT2 after resistance R8 is connected, concatenation
Overvoltage crowbar between diode rectifier U1 and control chip U2, is serially connected in the negative pole output of diode rectifier U1
Hold the surge voltage-suppressing circuit between overvoltage crowbar, respectively with colelctor electrode and the control chip U2 phase of audion VT1
The field effect constant-current drive circuit connected, and be serially connected in the DRV pin of control chip U2 and field effect constant-current drive circuit it
Between current detection circuit composition；The emitter stage of described audion VT1 is connected with the cathode output end of diode rectifier U1；
The FB pin of described control chip U2 is connected with the emitter stage of audion VT2, its GND pin ground connection；Described diode rectification
Two inputs of device U1 are collectively forming the input of this constant-current driving power supply；The outfan of described field effect constant-current drive circuit
Outfan as this constant-current driving power supply.
Further, described current detection circuit by amplifier P, audion VT8, positive pole after resistance R26 with amplifier P's
The polar capacitor C14 that positive pole is connected, negative pole is connected with the DRV pin of control chip U2, positive pole after resistance R24 with polarity
The negative pole of electric capacity C14 is connected, polar capacitor C15, the P pole of minus earth is sequentially electric with polarity after resistance R28 and resistance R25
Holding the diode D11 that positive pole is connected, N pole colelctor electrode with audion VT8 after resistance R31 is connected of C14, negative pole is through electricity
Be connected with the negative pole of amplifier P after resistance R27, polar capacitor that positive pole base stage with audion VT8 after resistance R30 is connected
Two poles that outfan is connected, N pole is connected with field effect constant-current drive circuit with amplifier P after resistance R21, C16, P pole
Pipe D12, and the polar capacitor that positive pole is connected with the N pole of diode D12, negative pole is connected with the emitter stage of audion VT8
C17 forms；The grounded collector of described audion VT8；The minus earth of described polar capacitor C16.
Described surge voltage-suppressing circuit is by field effect transistor MOS2, audion VT6, audion VT7, and positive pole is through resistance R17
Be connected with the source electrode of field effect transistor MOS2 afterwards, polar capacitor that negative pole is connected with the cathode output end of diode rectifier U1
Two poles that after C10, P electrode resistance R16, the positive pole with polar capacitor C10 is connected, N pole is connected with the emitter stage of audion VT6
Pipe D8, the pole that negative pole is connected with the grid of field effect transistor MOS2, positive pole is connected with the P pole of diode D8 after resistance R18
Property electric capacity C11, N pole is connected with the grid of field effect transistor MOS2, P pole base stage with audion VT6 after resistance R19 is connected
Diode D9, one end is connected with the positive pole of polar capacitor C11, the other end is connected with the grid of field effect transistor MOS2 can
Adjusting resistance R20, positive pole is connected with the N pole of diode D9, negative pole base stage with audion VT7 after resistance R21 is connected
Polar capacitor C12, positive pole colelctor electrode with audion VT7 after resistance R23 is connected, the polar capacitor C13 of minus earth, and one
The resistance R22 that end is connected with the drain electrode of field effect transistor MOS2, the other end is connected with the emitter stage of audion VT7, and P pole
Be connected with the source electrode of field effect transistor MOS2, diode D10 that N pole is connected with the drain electrode of field effect transistor MOS2 composition；Described
The grounded collector of audion VT6；The emitter stage of described audion VT7 is connected with overvoltage crowbar.
Described overvoltage crowbar is by the cathode output end of audion VT3, audion VT4, P pole and diode rectifier U1
Be connected, diode D4 that N pole base stage with audion VT4 after resistance R6 is connected, negative pole after resistance R5 with audion
The VON of the polar capacitor C2 that the base stage of VT4 is connected, positive pole is connected with the base stage of audion VT3, positive pole and control chip U2
Pin is connected, negative pole emitter stage with audion VT3 after resistance R4 is connected polar capacitor C4, P pole and audion VT7
The CS pin of diode D3, the N pole that emitter stage is connected, N pole is connected with the negative pole of polar capacitor C4 and control chip U2
Be connected, diode D2 that P pole negative pole with polar capacitor C4 after resistance R3 is connected, the transmitting of one end and audion VT4
The inductance L1 that pole is connected, the other end is connected with the IN pin of control chip U2, with the collection of audion VT3 after positive electrode resistance R1
The polar capacitor C3 that electrode is connected, negative pole colelctor electrode with audion VT4 after resistance R2 is connected, and P pole and three poles
The diode D1 composition that the colelctor electrode of pipe VT3 is connected, N pole is connected with the negative pole of polar capacitor C3；Described polar capacitor C3
Minus earth；The P pole of described diode D2 is connected with the colelctor electrode of audion VT4.
Described field effect constant-current drive circuit by field effect transistor MOS1, audion VT5, positive pole after resistance R15 with control
The polar capacitor C9 that the VM pin of chip U2 is connected, negative pole emitter stage with audion VT5 after resistance R14 is connected, negative
The polarity that VM pin is connected, positive pole is connected with the source electrode of field effect transistor MOS1 after resistance R12 of pole and control chip U2
Electric capacity C8, the adjustable electric that one end is connected with the colelctor electrode of audion VT5, the other end is connected with the VM pin of control chip U2
Resistance R13, negative pole emitter stage with audion VT5 after resistance R10 is connected, positive pole is connected with the grid of field effect transistor MOS1
Polar capacitor C6, N pole be connected with the drain electrode of field effect transistor MOS1, P pole after inductance L2 with the colelctor electrode phase of audion VT1
P pole with diode D6 after resistance R9, diode D6, the P pole connected is connected, N pole is common with the source electrode of field effect transistor MOS1
Form the Zener diode D7 of the outfan of field effect constant-current drive circuit, and positive pole is extremely connected with the N of Zener diode D7
Connect, negative pole be connected with the source electrode of field effect transistor MOS1 after ground connection polar capacitor C7 composition；The base stage of described audion VT5 with
The N pole of diode D12 is connected；The minus earth of described polar capacitor C9.
For the practical effect of the present invention, described control chip U2 preferentially uses the integrated chip of NCP1653 to realize.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) instant high-voltage of input voltage can be eliminated or suppress by the present invention, and the present invention can improve voltage
Resistance to pressure, and the middle zero migration of electric current can be controlled, ensure that the present invention can export stable voltage and
Electric current, effectively ensure that the stability of LED brightness, extends the service life of LED simultaneously.
(2) present invention can effectively reduce Leakage Current and the loss current of output electric current, and can suppress to export electric current
Unusual fluctuations, make output electric current keep stable, thus improve the stability of the output electric current of the present invention.
(3) the transient state high surge current that input voltage produces can be suppressed by the present invention, is effectively subtracted by surge current
Little in the range of permission, thus improve the stability of output voltage of the present invention and electric current.
(4) the control chip U2 of the present invention preferentially have employed the integrated chip of NCP1653 and realizes, this chip and external circuit
Combine and effectively raise the stability of output voltage and electric current, ensure that the present invention can export stable voltage and electricity
Stream.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the electrical block diagram of the surge voltage-suppressing circuit of the present invention.
Fig. 3 is the electrical block diagram of the current detection 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, audion VT1, audion VT2,
Resistance R7, resistance R8, resistance R11, polar capacitor C1, polar capacitor C5, diode D5, current detection circuit, overvoltage protection electricity
Road, surge voltage-suppressing circuit, and field effect constant-current drive circuit composition.
During connection, the positive pole of polar capacitor C1 is connected with the cathode output end of diode rectifier U1, its negative pole and two
The cathode output end of pole pipe commutator U1 is connected.The positive pole of polar capacitor C5 is connected with the base stage of audion VT1, its negative pole
After resistance R7, the colelctor electrode with audion VT2 is connected.The N pole of diode D5 after resistance R11 with the DRV of control chip U2
Pin is connected, its P pole base stage with audion VT2 after resistance R8 is connected.It is whole that overvoltage crowbar is serially connected in diode
Between stream device U1 and control chip U2.Surge voltage-suppressing circuit is serially connected in cathode output end and the overvoltage of diode rectifier U1
Between protection circuit.Field effect constant-current drive circuit is connected with colelctor electrode and the control chip U2 of audion VT1 respectively.Electric current
Testing circuit is serially connected between the DRV pin of control chip U2 and field effect constant-current drive circuit.
The emitter stage of described audion VT1 is connected with the cathode output end of diode rectifier U1；Described control chip
The FB pin of U2 is connected with the emitter stage of audion VT2, its GND pin ground connection, its VCC pin are connected with external power source；
Two inputs of described diode rectifier U1 are collectively forming the input of this constant-current driving power supply and are connected with external power source
Connect；The outfan of described field effect constant-current drive circuit as the outfan of this constant-current driving power supply and is connected with LED.
Further, described overvoltage crowbar by audion VT3, audion VT4, resistance R1, resistance R2, resistance R3,
Resistance R4, resistance R5, resistance R6, polar capacitor C2, polar capacitor C3, polar capacitor C4, diode D1, diode D2, two poles
Pipe D3, diode D4, and inductance L1 form.
During connection, the P pole of diode D4 is connected with the cathode output end of diode rectifier U1, its N pole is through resistance R6
Base stage with audion VT4 is connected afterwards.The negative pole of polar capacitor C2 base stage with audion VT4 after resistance R5 is connected,
Its positive pole is connected with the base stage of audion VT3.The positive pole of polar capacitor C4 is connected with the VON pin of control chip U2, it
Negative pole emitter stage with audion VT3 after resistance R4 is connected.The P pole of diode D3 is connected with the emitter stage of audion VT7
Connect, its N pole is connected with the negative pole of polar capacitor C4.
Meanwhile, the N pole of diode D2 be connected with the CS pin of control chip U2, its P pole after resistance R3 with polarity electricity
The negative pole holding C4 is connected.One end of inductance L1 is connected with the emitter stage of audion VT4, its other end and control chip U2
IN pin is connected.After positive electrode resistance R1 of polar capacitor C3, the colelctor electrode with audion VT3 is connected, its negative pole is through resistance R2
Colelctor electrode with audion VT4 is connected afterwards.The P pole of diode D1 is connected with the colelctor electrode of audion VT3, its N pole and pole
The negative pole of property electric capacity C3 is connected.The minus earth of described polar capacitor C3；The P pole of described diode D2 is with audion VT4's
Colelctor electrode is connected.
Further, described field effect constant-current drive circuit is by field effect transistor MOS1, audion VT5, resistance R9, resistance
R10, resistance R12, adjustable resistance R13, resistance R14, resistance R15, polar capacitor C6, polar capacitor C7, polar capacitor C8, polarity
Electric capacity C9, diode D6, and Zener diode D7 form.
During connection, the positive pole of polar capacitor C9 VM pin with control chip U2 after resistance R15 is connected, its negative pole warp
After resistance R14, the emitter stage with audion VT5 is connected.The negative pole of polar capacitor C8 is connected with the VM pin of control chip U2
Connect, its positive pole source electrode with field effect transistor MOS1 after resistance R12 is connected.
Wherein, one end of adjustable resistance R13 be connected with the colelctor electrode of audion VT5, its other end and control chip U2
VM pin be connected.The negative pole of polar capacitor C6 emitter stage with audion VT5 after resistance R10 is connected, its positive pole with
The grid of field effect transistor MOS1 is connected.The N pole of diode D6 is connected with the drain electrode of field effect transistor MOS1, its P pole is through inductance
After L2, the colelctor electrode with audion VT1 is connected.
Meanwhile, P pole with diode D6 after resistance R9, the P pole of Zener diode D7 be connected, its N pole and field effect transistor
The source electrode of MOS1 is collectively forming the outfan of field effect constant-current drive circuit and is connected with LED.The positive pole of polar capacitor C7
Be connected with the N pole of Zener diode D7, its negative pole be connected with the source electrode of field effect transistor MOS1 after ground connection.Described audion
The base stage of VT5 is connected with the N pole of diode D12；The minus earth of described polar capacitor C9.
As in figure 2 it is shown, described surge voltage-suppressing circuit is by field effect transistor MOS2, audion VT6, audion VT7, resistance
R16, resistance R17, resistance R18, resistance R19, adjustable resistance R20, resistance R21, resistance R22, resistance R23, polar capacitor C10,
Polar capacitor C11, polar capacitor C12, polar capacitor C13, diode D8, and diode D9, diode D10 forms.
During connection, the positive pole of polar capacitor C10 source electrode with field effect transistor MOS2 after resistance R17 is connected, its negative pole
It is connected with the cathode output end of diode rectifier U1.With the positive pole of polar capacitor C10 after P electrode resistance R16 of diode D8
Be connected, its N pole is connected with the emitter stage of audion VT6.The grid phase of the negative pole of polar capacitor C11 and field effect transistor MOS2
Connect, its positive pole P pole with diode D8 after resistance R18 is connected.
Wherein, the N pole of diode D9 be connected with the grid of field effect transistor MOS2, its P pole after resistance R19 with audion
The base stage of VT6 is connected.One end of adjustable resistance R20 is connected with the positive pole of polar capacitor C11, its other end and field effect transistor
The grid of MOS2 is connected.The positive pole of polar capacitor C12 is connected with the N pole of diode D9, its negative pole after resistance R21 with three
The base stage of pole pipe VT7 is connected.
Meanwhile, the positive pole of polar capacitor C13 colelctor electrode with audion VT7 after resistance R23 is connected, its negative pole connects
Ground.One end of resistance R22 is connected with the drain electrode of field effect transistor MOS2, its other end is connected with the emitter stage of audion VT7.
The P pole of diode D10 is connected with the source electrode of field effect transistor MOS2, its N pole is connected with the drain electrode of field effect transistor MOS2.Described
The grounded collector of audion VT6；The emitter stage of described audion VT7 is connected with overvoltage crowbar.
As it is shown on figure 3, described current detection circuit is by amplifier P, audion VT8, resistance R24, resistance R25, resistance
R26, resistance R27, resistance R28, resistance R29, resistance R30, resistance R31, polar capacitor C14, polar capacitor C15, polar capacitor
C16, polar capacitor C17, diode D11, and diode D12 form.
During connection, the positive pole of polar capacitor C14 positive pole with amplifier P after resistance R26 is connected, its negative pole and control
The DRV pin of chip U2 is connected.The positive pole of polar capacitor C15 negative pole with polar capacitor C14 after resistance R24 is connected,
Its minus earth.The P pole of diode D11 is sequentially connected through resistance R28 positive pole with polar capacitor C14 after resistance R25, it
N pole colelctor electrode with audion VT8 after resistance R31 is connected.
Meanwhile, the negative pole of polar capacitor C16 negative pole with amplifier P after resistance R27 is connected, its positive pole is through resistance
After R30, the base stage with audion VT8 is connected.The P pole of diode D12 outfan with amplifier P after resistance R29 is connected
Connect, its N pole is connected with field effect constant-current drive circuit.The positive pole of polar capacitor C17 is connected with the N pole of diode D12, it
Negative pole is connected with the emitter stage of audion VT8.The grounded collector of described audion VT8；The negative pole of described polar capacitor C16
Ground connection.
During operation, the instant high-voltage of input voltage can be eliminated or suppress by the present invention, and the present invention can improve
The resistance to pressure of voltage, and the middle zero migration of electric current can be controlled, ensure that the present invention can export stable electricity
Pressure and electric current, effectively ensure that the stability of LED brightness, extend the service life of LED simultaneously.The present invention can be effective
Reduce the output Leakage Current of electric current and loss current, and can suppress the unusual fluctuations of output electric current, make output electric current keep
Stable, thus improve the stability of the output electric current of the present invention.
Meanwhile, the transient state high surge current that input voltage produces can be suppressed, effectively by surge current by the present invention
It is reduced in the range of permission, thus improves the stability of output voltage of the present invention and electric current.The control chip U2 of the present invention
Preferentially have employed the integrated chip of NCP1653 to realize, this chip combine with external circuit effectively raise output voltage and
The stability of electric current, ensures that the present invention can export stable voltage and current.
According to above-described embodiment, can well realize the present invention.
Claims (6)
1. the LED constant current of processing of circuit type more than a kind drives power supply, it is characterised in that main by control chip U2, diode rectification
Device U1, audion VT1, audion VT2, positive pole is connected with the cathode output end of diode rectifier U1, negative pole and diode
The polar capacitor C1 that the cathode output end of commutator U1 is connected, positive pole is connected with the base stage of audion VT1, negative pole is through resistance
Polar capacitor C5, the N pole that after R7, colelctor electrode with audion VT2 is connected after resistance R11 with the DRV pin of control chip U2
Be connected, diode D5 that P pole base stage with audion VT2 after resistance R8 is connected, be serially connected in diode rectifier U1 with
Overvoltage crowbar between control chip U2, be serially connected in the cathode output end of diode rectifier U1 and overvoltage crowbar it
Between surge voltage-suppressing circuit, the field effect constant current being connected with colelctor electrode and the control chip U2 of audion VT1 respectively is driven
Galvanic electricity road, and the current detection circuit group being serially connected between the DRV pin of control chip U2 and field effect constant-current drive circuit
Become；The emitter stage of described audion VT1 is connected with the cathode output end of diode rectifier U1；The FB of described control chip U2
Pin is connected with the emitter stage of audion VT2, its GND pin ground connection；Two inputs of described diode rectifier U1 are altogether
The input of similar shape cost constant-current driving power supply；The outfan of described field effect constant-current drive circuit is as this constant-current driving power supply
Outfan.
One many processing of circuit type LED constant current the most according to claim 1 drives power supply, it is characterised in that described electric current
Testing circuit is by amplifier P, and audion VT8, positive pole positive pole with amplifier P after resistance R26 is connected, negative pole and control core
The polar capacitor C14 that the DRV pin of sheet U2 is connected, positive pole negative pole with polar capacitor C14 after resistance R24 is connected, negative
Polar capacitor C15, the P pole of pole ground connection is sequentially connected through resistance R28 positive pole with polar capacitor C14 after resistance R25, N pole
The diode D11 that colelctor electrode with audion VT8 is connected after resistance R31, negative pole negative with amplifier P after resistance R27
Polar capacitor C16, the P pole that pole is connected, positive pole base stage with audion VT8 after resistance R30 is connected after resistance R21 with
The diode D12 that the outfan of amplifier P is connected, N pole is connected with field effect constant-current drive circuit, and positive pole and two poles
The polar capacitor C17 composition that the N pole of pipe D12 is connected, negative pole is connected with the emitter stage of audion VT8；Described audion VT8
Grounded collector；The minus earth of described polar capacitor C16.
One many processing of circuit type LED constant current the most according to claim 2 drives power supply, it is characterised in that described surge
Voltage-suppressing circuit by field effect transistor MOS2, audion VT6, audion VT7, positive pole after resistance R17 with field effect transistor MOS2
Polar capacitor C10, P electrode resistance R16 that source electrode is connected, negative pole is connected with the cathode output end of diode rectifier U1 after
Be connected with the positive pole of polar capacitor C10, diode D8 that N pole is connected with the emitter stage of audion VT6, negative pole and field effect
The grid of pipe MOS2 is connected, positive pole is connected with the P pole of diode D8 after resistance R18 polar capacitor C11, N pole and field
The diode D9 that the grid of effect pipe MOS2 is connected, P pole base stage with audion VT6 after resistance R19 is connected, one end with
The adjustable resistance R20 that the positive pole of polar capacitor C11 is connected, the other end is connected with the grid of field effect transistor MOS2, positive pole with
The polar capacitor C12 that the N pole of diode D9 is connected, negative pole base stage with audion VT7 after resistance R21 is connected, positive pole
After resistance R23 the colelctor electrode with audion VT7 be connected, the polar capacitor C13 of minus earth, one end and field effect transistor MOS2
The resistance R22 that drain electrode is connected, the other end is connected with the emitter stage of audion VT7, and P pole and field effect transistor MOS2
The diode D10 composition that source electrode is connected, N pole is connected with the drain electrode of field effect transistor MOS2；The colelctor electrode of described audion VT6
Ground connection；The emitter stage of described audion VT7 is connected with overvoltage crowbar.
One many processing of circuit type LED constant current the most according to claim 3 drives power supply, it is characterised in that described overvoltage
Protection circuit is by audion VT3, and audion VT4, P pole is connected with the cathode output end of diode rectifier U1, N pole is through resistance
The diode D4 that after R6, base stage with audion VT4 is connected, negative pole base stage with audion VT4 after resistance R5 is connected,
The polar capacitor C2 that positive pole is connected with the base stage of audion VT3, positive pole is connected with the VON pin of control chip U2, negative pole
Polar capacitor C4, the P pole that emitter stage with audion VT3 is connected after resistance R4 is connected with the emitter stage of audion VT7,
Diode D3, the N pole that N pole is connected with the negative pole of polar capacitor C4 is connected with the CS pin of control chip U2, P pole is through resistance
The diode D2 that after R3, negative pole with polar capacitor C4 is connected, one end is connected with the emitter stage of audion VT4, the other end with
The inductance L1 that the IN pin of control chip U2 is connected, after positive electrode resistance R1 the colelctor electrode with audion VT3 be connected, negative pole warp
The polar capacitor C3 that after resistance R2, colelctor electrode with audion VT4 is connected, and P pole is connected with the colelctor electrode of audion VT3
Connect, diode D1 that N pole is connected with the negative pole of polar capacitor C3 composition；The minus earth of described polar capacitor C3；Described two
The P pole of pole pipe D2 is connected with the colelctor electrode of audion VT4.
One many processing of circuit type LED constant current the most according to claim 4 drives power supply, it is characterised in that described field is imitated
Answer constant-current drive circuit by field effect transistor MOS1, audion VT5, positive pole after resistance R15 with the VM pin phase of control chip U2
Connect, polar capacitor C9 that negative pole emitter stage with audion VT5 after resistance R14 is connected, negative pole is with control chip U2's
The polar capacitor C8 that VM pin is connected, positive pole is connected with the source electrode of field effect transistor MOS1 after resistance R12, one end and three poles
The adjustable resistance R13 that the colelctor electrode of pipe VT5 is connected, the other end is connected with the VM pin of control chip U2, negative pole is through resistance
Polar capacitor C6, the N pole that after R10, the emitter stage with audion VT5 is connected, positive pole is connected with the grid of field effect transistor MOS1
Be connected with the drain electrode of field effect transistor MOS1, diode D6, P that P pole colelctor electrode with audion VT1 after inductance L2 is connected
P pole with diode D6 after resistance R9, pole is connected, the source electrode of N pole and field effect transistor MOS1 is collectively forming field effect constant current and drives
The Zener diode D7 of the outfan on galvanic electricity road, and positive pole is connected with the N pole of Zener diode D7, negative pole and field effect transistor
The source electrode of MOS1 be connected after ground connection polar capacitor C7 composition；The N pole phase of the base stage of described audion VT5 and diode D12
Connect；The minus earth of described polar capacitor C9.
One many processing of circuit type LED constant current the most according to claim 5 drives power supply, it is characterised in that described control
Chip U2 is the integrated chip of NCP1653.
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| CN201610565634.0A CN106061031A (en) | 2016-07-18 | 2016-07-18 | Multi-circuit processing type LED constant current driving power supply |
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| CN201610565634.0A CN106061031A (en) | 2016-07-18 | 2016-07-18 | Multi-circuit processing type LED constant current driving power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108601162A (en) * | 2018-07-03 | 2018-09-28 | 上海路傲电子科技有限公司 | LED illumination linear constant current driving circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108601162A (en) * | 2018-07-03 | 2018-09-28 | 上海路傲电子科技有限公司 | LED illumination linear constant current driving circuit |
| CN108601162B (en) * | 2018-07-03 | 2021-07-06 | 上海路傲电子科技有限公司 | LED lighting linear constant current driving circuit |
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