CN106132015A - A kind of LED constant current drives power supply - Google Patents
A kind of LED constant current drives power supply Download PDFInfo
- Publication number
- CN106132015A CN106132015A CN201610566406.5A CN201610566406A CN106132015A CN 106132015 A CN106132015 A CN 106132015A CN 201610566406 A CN201610566406 A CN 201610566406A CN 106132015 A CN106132015 A CN 106132015A
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- pole
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- diode
- polar capacitor
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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 kind of LED constant current and drive power supply; it is characterized in that; main by control chip U2, diode rectifier U1, audion VT1; audion VT2; polar capacitor C1, polar capacitor C5, diode D5; it is serially connected in the overvoltage crowbar between diode rectifier U1 and control chip U2, and the field effect constant-current drive circuit composition being connected respectively with colelctor electrode and the control chip U2 of audion VT1.The instant high-voltage of input voltage can be eliminated or suppress by the present invention, and the present invention can put forward high-tension resistance to pressure, and the middle zero migration of electric current can be controlled, ensure that the present invention can export stable voltage and current, effectively ensure that the stability of LED brightness, effectively extend the service life of LED simultaneously.
Description
Technical field
The present invention relates to electronic applications, specifically, be that a kind of 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 a kind of LED constant current drive power supply.
The present invention is achieved through the following technical solutions: a kind of LED constant current drives power supply, mainly by control chip U2, two
Pole pipe commutator U1, audion VT1, audion VT2, positive pole is connected with the cathode output end of diode rectifier U1, negative pole
The polar capacitor C1 being connected with the cathode output end of diode rectifier U1, positive pole is connected with the base stage of audion VT1, bears
Polar capacitor C5, the N pole that pole colelctor electrode with audion VT2 after resistance R7 is connected after resistance R11 with control chip U2
The diode D5 that DRV pin is connected, P pole base stage with audion VT2 after resistance R8 is connected, be serially connected in diode whole
Overvoltage crowbar between stream device U1 and control chip U2, and respectively with colelctor electrode and the control chip U2 of audion VT1
The field effect constant-current drive circuit composition being connected；The emitter stage of described audion VT1 is defeated with the positive pole of diode rectifier U1
Go out end to be connected；The FB pin of described control chip U2 is connected with the emitter stage of audion VT2, its GND pin ground connection；Described
Two inputs of diode rectifier U1 are collectively forming the input of this constant-current driving power supply；Described field effect constant-current driving electricity
The outfan on road is as the outfan of this constant-current driving power supply.
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
Polar capacitor C4, the P pole that pin is connected, negative pole emitter stage with audion VT3 after resistance R4 is connected is whole with diode
Diode D3, the N pole that cathode output end is connected, N pole is connected with the negative pole of polar capacitor C4 of stream device U1 and control chip
The diode D2 that the CS pin of U2 is connected, P pole negative pole with polar capacitor C4 after resistance R3 is connected, one end and audion
The inductance L1 that the emitter stage of VT4 is connected, the other end is connected with the IN pin of control chip U2, with three poles after positive electrode resistance R1
The polar capacitor C3 that the colelctor electrode of pipe VT3 is connected, negative pole colelctor electrode with audion VT4 after resistance R2 is connected, and P
The diode D1 composition that pole is connected with the colelctor electrode of audion VT3, N pole is connected with the negative pole of polar capacitor C3；Described pole
The minus earth of property electric capacity C3；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 MOS, audion VT5, positive pole after resistance R15 with control core
The polar capacitor C9 that the VM pin of sheet U2 is connected, negative pole emitter stage with audion VT5 after resistance R14 is connected, negative pole
The polar capacitor that VM pin is connected, positive pole is connected with the source electrode of field effect transistor MOS after resistance R12 with control chip U2
C8, the adjustable resistance 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
R13, negative pole emitter stage with audion VT5 after resistance R10 is connected, positive pole is connected with the grid of field effect transistor MOS
Polar capacitor C6, N pole is connected with the drain electrode of field effect transistor MOS, P pole colelctor electrode with audion VT1 after inductance L2 is connected
P pole with diode D6 after resistance R9, diode D6, the P pole connect is connected, the common shape of source electrode of N pole and field effect transistor MOS
The Zener diode D7 of the outfan of one-tenth field effect constant-current drive circuit, and positive pole is connected with the N pole of Zener diode D7,
Negative pole be connected with the source electrode of field effect transistor MOS after ground connection polar capacitor C7 composition；The base stage of described audion VT5 and control
The DRV pin of chip U2 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) 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.
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, overvoltage crowbar, and field effect
Constant-current drive circuit forms.
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.Field effect constant-current drive circuit respectively with colelctor electrode and the control chip U2 of audion VT1
It is connected.
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 defeated with the negative pole of diode rectifier U1
Go out end be connected, 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 MOS, 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 MOS 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 MOS is connected.The N pole of diode D6 is connected with the drain electrode of field effect transistor MOS, its P pole is through inductance L2
Colelctor electrode with audion VT1 is connected afterwards.
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 MOS is collectively forming the outfan of field effect constant-current drive circuit and is connected with LED.The positive pole of polar capacitor C7 with
Ground connection after the N pole of Zener diode D7 is connected, its negative pole is connected with the source electrode of field effect transistor MOS.Described audion VT5's
Base stage is connected with the DRV pin of control chip U2；The minus earth of described polar capacitor C9.
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.
Meanwhile, the control chip U2 of the present invention preferentially have employed the integrated chip of NCP1653 and realizes, this chip and external electrical
Road combines and effectively raises the stability of output voltage and electric current, ensure that the present invention can export stable voltage and
Electric current.
According to above-described embodiment, can well realize the present invention.
Claims (4)
1. a LED constant current drives power supply, it is characterised in that main by control chip U2, diode rectifier U1, audion
VT1, audion VT2, positive pole is connected with the cathode output end of diode rectifier U1, negative pole is negative with diode rectifier U1's
The polar capacitor C1 that pole outfan is connected, positive pole is connected with the base stage of audion VT1, negative pole after resistance R7 with audion
Polar capacitor C5, the N pole that the colelctor electrode of VT2 is connected DRV pin with control chip U2 after resistance R11 is connected, P pole warp
The diode D5 that after resistance R8, base stage with audion VT2 is connected, be serially connected in diode rectifier U1 and control chip U2 it
Between overvoltage crowbar, and the field effect constant current being connected with colelctor electrode and the control chip U2 of audion VT1 respectively drives
Galvanic electricity road forms；The emitter stage of described audion VT1 is connected with the cathode output end of diode rectifier U1；Described control core
The FB pin of sheet U2 is connected with the emitter stage of audion VT2, its GND pin ground connection；Two of described diode rectifier U1
Input is collectively forming the input of this constant-current driving power supply；The outfan of described field effect constant-current drive circuit is as this constant current
Drive the outfan of power supply.
A kind of LED constant current the most according to claim 1 drives power supply, it is characterised in that described overvoltage crowbar is by three
Pole pipe VT3, audion VT4, P pole is connected with the cathode output end of diode rectifier U1, N pole after resistance R6 with audion
The diode D4 that the base stage of VT4 is connected, negative pole base stage with audion VT4 after resistance R5 is connected, positive pole and audion
The polar capacitor C2 that the base stage of VT3 is connected, positive pole is connected with the VON pin of control chip U2, negative pole after resistance R4 with
Polar capacitor C4, the P pole that the emitter stage of audion VT3 is connected is connected with the cathode output end of diode rectifier U1, N pole
Diode D3, the N pole being connected with the negative pole of polar capacitor C4 is connected with the CS pin of control chip U2, P pole is through resistance R3
The diode D2 that negative pole with polar capacitor C4 is connected afterwards, one end is connected with the emitter stage of audion VT4, the other end and control
The inductance L1 that the IN pin of coremaking sheet U2 is connected, after positive electrode resistance R1, the colelctor electrode with audion VT3 is connected, negative pole is through electricity
The polar capacitor C3 being connected with the colelctor electrode of audion VT4 after resistance R2, and P pole is connected with the colelctor electrode of audion VT3,
The diode D1 composition that N pole is connected with the negative pole of polar capacitor C3；The minus earth of described polar capacitor C3；Described diode
The P pole of D2 is connected with the colelctor electrode of audion VT4.
A kind of LED constant current the most according to claim 2 drives power supply, it is characterised in that described field effect constant-current driving electricity
Route field effect transistor MOS, audion VT5, positive pole VM pin with control chip U2 after resistance R15 is connected, negative pole is through electricity
The polar capacitor C9 that is connected with the emitter stage of audion VT5 after resistance R14, negative pole is connected with the VM pin of control chip U2,
The colelctor electrode of the polar capacitor C8 that positive pole is connected with the source electrode of field effect transistor MOS after resistance R12, one end and audion VT5
Be connected, adjustable resistance R13 that the other end is connected with the VM pin of control chip U2, negative pole after resistance R10 with audion
Polar capacitor C6, the N pole that the emitter stage of VT5 is connected, positive pole is connected with the grid of field effect transistor MOS and field effect transistor MOS
Diode D6, the P pole that drain electrode is connected, P pole colelctor electrode with audion VT1 after inductance L2 is connected after resistance R9 with
The P pole of diode D6 is connected, the source electrode of N pole and field effect transistor MOS is collectively forming the outfan of field effect constant-current drive circuit
Zener diode D7, and positive pole is connected with the N pole of Zener diode D7, negative pole is connected with the source electrode of field effect transistor MOS
Connect the polar capacitor C7 composition of rear ground connection；The base stage of described audion VT5 is connected with the DRV pin of control chip U2；Described
The minus earth of polar capacitor C9.
A kind of LED constant current the most according to claim 3 drives power supply, it is characterised in that described control chip U2 is
The integrated chip of NCP1653.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610566406.5A CN106132015A (en) | 2016-07-18 | 2016-07-18 | A kind of LED constant current drives power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610566406.5A CN106132015A (en) | 2016-07-18 | 2016-07-18 | A kind of LED constant current drives power supply |
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| Publication Number | Publication Date |
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| CN106132015A true CN106132015A (en) | 2016-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610566406.5A Pending CN106132015A (en) | 2016-07-18 | 2016-07-18 | A kind of LED constant current drives power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106535405A (en) * | 2016-11-28 | 2017-03-22 | 湖州明日照明科技有限公司 | LED constant-current drive circuit |
-
2016
- 2016-07-18 CN CN201610566406.5A patent/CN106132015A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106535405A (en) * | 2016-11-28 | 2017-03-22 | 湖州明日照明科技有限公司 | LED constant-current drive circuit |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20161116 |
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| WD01 | Invention patent application deemed withdrawn after publication |