CN106211431A - A kind of LED digitizer tablet soft light power supply based on voltage-regulating circuit - Google Patents
A kind of LED digitizer tablet soft light power supply based on voltage-regulating circuit Download PDFInfo
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- CN106211431A CN106211431A CN201610551912.7A CN201610551912A CN106211431A CN 106211431 A CN106211431 A CN 106211431A CN 201610551912 A CN201610551912 A CN 201610551912A CN 106211431 A CN106211431 A CN 106211431A
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- pole
- voltage
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- resistance
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses a kind of LED digitizer tablet soft light power supply based on voltage-regulating circuit; it is characterized in that; main by voltage stabilizing chip U2, transformator T, diode rectifier U1; audion VT1; polar capacitor C1, polar capacitor C2, over-voltage over-current protection circuit; voltage-regulating circuit, and the adjustable constant-flow drive circuit composition being connected with over-voltage over-current protection circuit.The instant high-voltage of voltage can be eliminated or suppress by the present invention, the backend electronics element and the LED digitizer tablet soft light that are effectively prevented the present invention are damaged by high voltage, and voltage and current can also be adjusted by the present invention, the voltage and current making output is consistent with the reference voltage needed for LED digitizer tablet soft light and electric current, ensures that the present invention can export stable voltage and current.
Description
Technical field
The present invention relates to electronic applications, specifically, be a kind of LED digitizer tablet sheen based on voltage-regulating circuit
Lamp power supply.
Background technology
LED digitizer tablet soft light, is that one utilizes low-power LED to form face light, and combines high transmission rate softbox
The new generation of green environmental protection light source formed.It is soft, uniform that LED digitizer tablet soft light has illumination, without infrared ray, ultraviolet
Line, surface brightness is less than three-color fluorescent lamp, free from glare, the characteristic such as the most dazzling.LED digitizer tablet soft light is because of its institute at present
The above-mentioned characteristic that has and be widely used in specialty shooting and photography as light filling.But, existing LED digitizer tablet sheen
There is output voltage and the problem of electric current instability in lamp power supply, causes the brightness of LED digitizer tablet soft light flicker, light occur
According to uneven, shooting and the quality of photography are had a strong impact on.
Therefore it provides a kind of LED digitizer tablet soft light power supply that can export stable voltage and current is when business
Anxious.
Summary of the invention
It is an object of the invention to overcome LED digitizer tablet soft light power supply of the prior art exist output voltage and
The defect that electric current is unstable, it is provided that a kind of based on voltage-regulating circuit LED digitizer tablet soft light power supply.
The present invention is achieved through the following technical solutions: a kind of LED digitizer tablet sheen based on voltage-regulating circuit
Lamp power supply, mainly by voltage stabilizing chip U2, transformator T, diode rectifier U1, audion VT1, positive pole and diode rectifier U1
Cathode output end be connected, negative pole be connected with diode rectifier U1 cathode output end after the polar capacitor C1 of ground connection, just
Pole is sequentially connected through resistance R1 colelctor electrode with audion VT1 after resistance R2, the GND pin phase of negative pole and voltage stabilizing chip U2
The polar capacitor C2 connected, the over-voltage over-current protection circuit being connected with voltage stabilizing chip U2, it is serially connected in diode rectifier U1's
Voltage-regulating circuit between cathode output end and over-voltage over-current protection circuit, and be connected with over-voltage over-current protection circuit
Adjustable constant-flow drive circuit forms；The base stage of described audion VT1 is connected with the cathode output end of diode rectifier U1, it
Emitter stage is connected with the VIN pin of voltage stabilizing chip U2；The Same Name of Ends of described transformator T secondary inductance coil and diode rectification
One of them input of device U1 is connected, its non-same polarity is connected with another input of diode rectifier U1；Institute
State the Same Name of Ends of transformator T former limit inductance coil and non-same polarity is collectively forming the input of this power supply；Described adjustable constant-flow drives
The outfan on galvanic electricity road is as the outfan of this power supply.
Described voltage-regulating circuit by amplifier P, audion VT5, audion VT6, P pole after resistance R13 with amplifier P
The diode D5 that positive pole is connected, N pole is connected with the cathode output end of diode rectifier U1, positive pole and amplifier P's
Negative pole is connected, be connected with the negative pole of polar capacitor C8 after polar capacitor C8, P electrode resistance R14 of minus earth, N pole is through electricity
The diode D6 that is connected with the colelctor electrode of audion VT5 after resistance R18, one end is connected with the N pole of diode D6, the other end and
The colelctor electrode of audion VT6 be connected after the adjustable resistance R19 of ground connection, negative pole is connected with the base stage of audion VT6, positive pole with
Polar capacitor C11, the P pole that the colelctor electrode of audion VT5 is connected is connected with the emitter stage of audion VT6, N pole is through resistance
The Zener diode D7 that after R17, emitter stage with audion VT5 is connected, negative pole is connected with the outfan of amplifier P, positive pole
The polar capacitor C10 being connected with the N pole of Zener diode D7 after adjustable resistance R16, and positive pole after resistance R12 with two
The polar capacitor C9 composition that the P pole of pole pipe D5 is connected, negative pole is connected with the adjustable end of adjustable resistance R16 after resistance R15；
The base stage of described audion VT5 is connected with the outfan of amplifier P；The N pole of described Zener diode D7 is as Voltage Cortrol
The outfan of circuit is also connected with over-voltage over-current protection circuit.
Described over-voltage over-current protection circuit by audion VT2, audion VT3, N pole after resistance R4 with audion VT3's
The diode D1 that colelctor electrode is connected, P pole is connected with the GND pin of voltage stabilizing chip U2, the base stage phase of negative pole and audion VT3
Connect, polar capacitor C3 that positive pole base stage with audion VT2 after resistance R3 is connected, negative pole after inductance L with audion
The polar capacitor C5 that the colelctor electrode of VT2 is connected, positive pole positive pole with polar capacitor C3 after resistance R5 is connected, one end and pole
The adjustable resistance R11 that negative pole is connected, the other end is connected with the positive pole of polar capacitor C5 of property electric capacity C5, and P pole and three
The emitter stage of pole pipe VT3 is connected, N pole is collectively forming the outfan of over-voltage over-current protection circuit also with the negative pole of polar capacitor C5
The diode D2 composition being connected with adjustable constant-flow drive circuit；The emitter stage of described audion VT2 and the N of Zener diode D7
Pole is connected；The base stage of described audion VT3 is connected with the VOUT pin of voltage stabilizing chip U2.
Described adjustable constant-flow drive circuit is imitated with field by field effect transistor MOS1, field effect transistor MOS2, audion VT4, positive pole
Should the polar capacitor C4 that source electrode is connected, negative pole is connected with the grid of field effect transistor MOS2 of pipe MOS1, one end and field effect
The grid of pipe MOS2 is connected, resistance R6, the P pole of other end ground connection is connected with the drain electrode of field effect transistor MOS1, N pole is through resistance
The diode D3 that after R10, emitter stage with audion VT4 is connected, negative pole is connected with the emitter stage of audion VT4, positive pole with
The polar capacitor C7 that the negative pole of polar capacitor C5 is connected, positive pole source electrode with field effect transistor MOS2 after resistance R9 is connected,
Polar capacitor C6, the P pole that negative pole is connected with the base stage of audion VT4 leakage with field effect transistor MOS2 after resistance R7 is connected
Connect, the positive pole of N pole and polar capacitor C7 is collectively forming the Zener diode D4, Yi Jiyi of outfan of adjustable constant-flow drive circuit
The adjustable resistance R8 composition that end is connected with the colelctor electrode of audion VT4, the other end is connected with the P pole of Zener diode D4；
The grid of described field effect transistor MOS1 is connected with the N pole of diode D2.
For the practical effect of the present invention, it is real that described voltage stabilizing chip U2 the most preferentially uses the integrated chip of LM7809
Existing.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) instant high-voltage of voltage can be eliminated or suppress by the present invention, is effectively prevented the rear end of the present invention
Electronic component and LED digitizer tablet soft light are damaged by high voltage, and voltage and current can also be adjusted by the present invention,
The voltage and current making output is consistent with the reference voltage needed for LED digitizer tablet soft light and electric current, ensures that this
Inventing and can export stable voltage and current, and effectively ensure that the brightness stability of LED digitizer tablet soft light, illumination is equal
Even, i.e. effectively raise shooting and the quality of photography.
(2) the high transient state of input voltage and electric current can be adjusted by the present invention, prevents the frequency of electric current from drift occur, makes
Voltage and current held stationary, ensures that the present invention can export stable voltage and current.
(3) the voltage stabilizing chip U2 of the present invention preferentially have employed the integrated chip of LM7809 and realizes, this chip and peripheral circuit
Combine and effectively raise the present invention and export the reliability of stable voltage and current.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the electrical block diagram of the voltage-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 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 voltage stabilizing chip U2, transformator T, diode rectifier U1, audion VT1, just
Pole is connected with the cathode output end of diode rectifier U1, negative pole is connected with diode rectifier U1 cathode output end is followed by
The polar capacitor C1 on ground, positive pole is sequentially connected through resistance R1 colelctor electrode with audion VT1 after resistance R2, negative pole and voltage stabilizing
The polar capacitor C2 that the GND pin of chip U2 is connected, the over-voltage over-current protection circuit being connected with voltage stabilizing chip U2, it is serially connected in
Voltage-regulating circuit between cathode output end and the over-voltage over-current protection circuit of diode rectifier U1, and and over-voltage and over-current
The adjustable constant-flow drive circuit composition that protection circuit is connected.
The base stage of described audion VT1 is connected with the cathode output end of diode rectifier U1, its emitter stage and voltage stabilizing
The VIN pin of chip U2 is connected；Wherein the one of the Same Name of Ends of described transformator T secondary inductance coil and diode rectifier U1
Individual input is connected, its non-same polarity is connected with another input of diode rectifier U1；The described former limit of transformator T
The Same Name of Ends of inductance coil and non-same polarity are collectively forming the input of this power supply；The outfan of described adjustable constant-flow drive circuit
Outfan as this power supply.
Wherein, described over-voltage over-current protection circuit by audion VT2, audion VT3, resistance R3, resistance R4, resistance R5,
Adjustable resistance R11, polar capacitor C3, polar capacitor C5, diode D1, diode D2, and inductance L form.
During connection, the N pole of diode D1 colelctor electrode with audion VT3 after resistance R4 is connected, its P pole and voltage stabilizing core
The GND pin of sheet U2 is connected.The negative pole of polar capacitor C3 is connected with the base stage of audion VT3, its positive pole is after resistance R3
It is connected with the base stage of audion VT2.The negative pole of polar capacitor C5 colelctor electrode with audion VT2 after inductance L is connected, it
Positive pole positive pole with polar capacitor C3 after resistance R5 is connected.
Meanwhile, one end of adjustable resistance R11 be connected with the negative pole of polar capacitor C5, its other end and polar capacitor C5
Positive pole is connected.The P pole of diode D2 is connected with the emitter stage of audion VT3, its N pole is common with the negative pole of polar capacitor C5
Form the outfan of over-voltage over-current protection circuit and be connected with adjustable constant-flow drive circuit.The emitter stage of described audion VT2
It is connected with the N pole of Zener diode D7；The base stage of described audion VT3 is connected with the VOUT pin of voltage stabilizing chip U2.
Further, described adjustable constant-flow drive circuit is by field effect transistor MOS1, field effect transistor MOS2, audion VT4, electricity
Resistance R6, resistance R7, adjustable resistance R8, resistance R9, resistance R10, polar capacitor C4, polar capacitor C6, polar capacitor C7, diode
D3, and Zener diode D4 composition.
During connection, the positive pole of polar capacitor C4 is connected with the source electrode of field effect transistor MOS1, its negative pole and field effect transistor
The grid of MOS2 is connected.One end of resistance R6 is connected with the grid of field effect transistor MOS2, its other end ground connection.Diode D3
P pole be connected with the drain electrode of field effect transistor MOS1, its N pole emitter stage with audion VT4 after resistance R10 is connected.Pole
The negative pole of electric capacity C7 is connected property with the emitter stage of audion VT4, its positive pole is connected with the negative pole of polar capacitor C5.
Meanwhile, the positive pole of polar capacitor C6 source electrode with field effect transistor MOS2 after resistance R9 be connected, its negative pole and three
The base stage of pole pipe VT4 is connected.The leakage with field effect transistor MOS2 after resistance R7 of the P pole of Zener diode D4 is connected, its N pole
With the outfan that the positive pole of polar capacitor C7 is collectively forming adjustable constant-flow drive circuit.One end of adjustable resistance R8 and audion
The colelctor electrode of VT4 is connected, its other end is connected with the P pole of Zener diode D4.The grid of described field effect transistor MOS1 with
The N pole of diode D2 is connected.
As in figure 2 it is shown, described voltage-regulating circuit is by amplifier P, audion VT5, audion VT6, resistance R12, resistance
R13, resistance R14, resistance R15, adjustable resistance R16, resistance R17, resistance R18, adjustable resistance R19, polar capacitor C8, polarity electricity
Hold C9, polar capacitor C10, polar capacitor C11, diode D5, diode D6, and Zener diode D7 composition.
During connection, the P pole of diode D5 is connected with the positive pole of amplifier P after resistance R13, its N pole is whole with diode
The cathode output end of stream device U1 is connected.The positive pole of polar capacitor C8 is connected with the negative pole of amplifier P, its minus earth.Two
After P electrode resistance R14 of pole pipe D6 the negative pole with polar capacitor C8 be connected, its N pole after resistance R18 with the collection of audion VT5
Electrode is connected.
Wherein, one end of adjustable resistance R19 be connected with the N pole of diode D6, the current collection of its other end and audion VT6
Pole be connected after ground connection.The negative pole of polar capacitor C11 is connected with the base stage of audion VT6, the collection of its positive pole and audion VT5
Electrode is connected.The P pole of Zener diode D7 is connected with the emitter stage of audion VT6, its N pole after resistance R17 with three poles
The emitter stage of pipe VT5 is connected.
Meanwhile, the negative pole of polar capacitor C10 be connected with the outfan of amplifier P, its positive pole after adjustable resistance R16 with
The N pole of Zener diode D7 is connected.The positive pole of polar capacitor C9 P pole with diode D5 after resistance R12 is connected, it is born
Pole adjustable end with adjustable resistance R16 after resistance R15 is connected.The base stage of described audion VT5 and the outfan of amplifier P
It is connected；The N pole of described Zener diode D7 as the outfan of voltage-regulating circuit and is connected with over-voltage over-current protection circuit
Connect.
During enforcement, the instant high-voltage of voltage can be eliminated or suppress by the present invention, is effectively prevented the present invention's
Backend electronics element and LED digitizer tablet soft light are damaged by high voltage, and voltage and current can also be carried out by the present invention
Adjusting, the voltage and current making output is consistent with the reference voltage needed for LED digitizer tablet soft light and electric current, so that it is guaranteed that
The present invention can export stable voltage and current, and effectively ensure that the brightness stability of LED digitizer tablet soft light, light
According to uniformly, i.e. effectively raise shooting and the quality of photography.
Meanwhile, the high transient state of input voltage and electric current can be adjusted by the present invention, prevents the frequency of electric current from drift occur,
Make voltage and current held stationary, ensure that the present invention can export stable voltage and current.The voltage stabilizing chip of the present invention
U2 preferentially have employed the integrated chip of LM7809 and realizes, and this chip combines with peripheral circuit and effectively raises present invention output
The reliability of stable voltage and current.
According to above-described embodiment, can well realize the present invention.
Claims (5)
1. a LED digitizer tablet soft light power supply based on voltage-regulating circuit, it is characterised in that main by voltage stabilizing chip
U2, transformator T, diode rectifier U1, audion VT1, positive pole is connected with the cathode output end of diode rectifier U1, bears
Pole be connected with diode rectifier U1 cathode output end after the polar capacitor C1 of ground connection, positive pole is sequentially through resistance R1 and resistance R2
The polar capacitor C2 that colelctor electrode with audion VT1 is connected afterwards, negative pole is connected with the GND pin of voltage stabilizing chip U2, and surely
The over-voltage over-current protection circuit that pressure chip U2 is connected, the cathode output end being serially connected in diode rectifier U1 is protected with over-voltage and over-current
Voltage-regulating circuit between protection circuit, and the adjustable constant-flow drive circuit composition being connected with over-voltage over-current protection circuit；
The base stage of described audion VT1 is connected with the cathode output end of diode rectifier U1, its emitter stage and voltage stabilizing chip U2
VIN pin is connected；The Same Name of Ends of described transformator T secondary inductance coil and one of them input of diode rectifier U1
Be connected, its non-same polarity is connected with another input of diode rectifier U1；Described transformator T former limit inductance coil
Same Name of Ends and non-same polarity be collectively forming the input of this power supply；The outfan of described adjustable constant-flow drive circuit is as this electricity
The outfan in source.
A kind of LED digitizer tablet soft light power supply based on voltage-regulating circuit the most according to claim 1, its feature
Be, described voltage-regulating circuit by amplifier P, audion VT5, audion VT6, P pole after resistance R13 with amplifier P's
The diode D5 that positive pole is connected, N pole is connected with the cathode output end of diode rectifier U1, positive pole is negative with amplifier P's
Pole is connected, be connected with the negative pole of polar capacitor C8 after polar capacitor C8, P electrode resistance R14 of minus earth, N pole is through resistance
The diode D6 that after R18, colelctor electrode with audion VT5 is connected, one end is connected with the N pole of diode D6, the other end and three
The colelctor electrode of pole pipe VT6 be connected after the adjustable resistance R19 of ground connection, negative pole is connected with the base stage of audion VT6, positive pole and three
Polar capacitor C11, the P pole that the colelctor electrode of pole pipe VT5 is connected is connected with the emitter stage of audion VT6, N pole is through resistance R17
The Zener diode D7 that emitter stage with audion VT5 is connected afterwards, negative pole is connected with the outfan of amplifier P, positive pole warp
The polar capacitor C10 being connected with the N pole of Zener diode D7 after adjustable resistance R16, and positive pole after resistance R12 with two poles
The polar capacitor C9 composition that the P pole of pipe D5 is connected, negative pole is connected with the adjustable end of adjustable resistance R16 after resistance R15；Institute
The outfan of the base stage and amplifier P of stating audion VT5 is connected；The N pole of described Zener diode D7 is as Voltage Cortrol electricity
The outfan on road is also connected with over-voltage over-current protection circuit.
A kind of LED digitizer tablet soft light power supply based on voltage-regulating circuit the most according to claim 2, its feature
Be, described over-voltage over-current protection circuit by audion VT2, audion VT3, N pole after resistance R4 with the current collection of audion VT3
The diode D1 that pole is connected, P pole is connected with the GND pin of voltage stabilizing chip U2, negative pole is connected with the base stage of audion VT3
Connect, polar capacitor C3 that positive pole base stage with audion VT2 after resistance R3 is connected, negative pole after inductance L with audion VT2
The polar capacitor C5 that colelctor electrode is connected, positive pole positive pole with polar capacitor C3 after resistance R5 is connected, one end and polarity
The adjustable resistance R11 that the negative pole of electric capacity C5 is connected, the other end is connected with the positive pole of polar capacitor C5, and P pole and three poles
The emitter stage of pipe VT3 is connected, the negative pole of N pole and polar capacitor C5 be collectively forming over-voltage over-current protection circuit outfan and with
The diode D2 composition that adjustable constant-flow drive circuit is connected；The emitter stage of described audion VT2 and the N pole of Zener diode D7
It is connected；The base stage of described audion VT3 is connected with the VOUT pin of voltage stabilizing chip U2.
A kind of LED digitizer tablet soft light power supply based on voltage-regulating circuit the most according to claim 3, its feature
Being, described adjustable constant-flow drive circuit is by field effect transistor MOS1, field effect transistor MOS2, audion VT4, positive pole and field effect transistor
The polar capacitor C4 that the source electrode of MOS1 is connected, negative pole is connected with the grid of field effect transistor MOS2, one end and field effect transistor
The grid of MOS2 is connected, resistance R6, the P pole of other end ground connection is connected with the drain electrode of field effect transistor MOS1, N pole is through resistance
The diode D3 that after R10, emitter stage with audion VT4 is connected, negative pole is connected with the emitter stage of audion VT4, positive pole with
The polar capacitor C7 that the negative pole of polar capacitor C5 is connected, positive pole source electrode with field effect transistor MOS2 after resistance R9 is connected,
Polar capacitor C6, the P pole that negative pole is connected with the base stage of audion VT4 leakage with field effect transistor MOS2 after resistance R7 is connected
Connect, the positive pole of N pole and polar capacitor C7 is collectively forming the Zener diode D4, Yi Jiyi of outfan of adjustable constant-flow drive circuit
The adjustable resistance R8 composition that end is connected with the colelctor electrode of audion VT4, the other end is connected with the P pole of Zener diode D4；
The grid of described field effect transistor MOS1 is connected with the N pole of diode D2.
A kind of LED digitizer tablet soft light power supply based on voltage-regulating circuit the most according to claim 4, its feature
Being, described voltage stabilizing chip U2 is the integrated chip of LM7809.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610551912.7A CN106211431A (en) | 2016-07-13 | 2016-07-13 | A kind of LED digitizer tablet soft light power supply based on voltage-regulating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610551912.7A CN106211431A (en) | 2016-07-13 | 2016-07-13 | A kind of LED digitizer tablet soft light power supply based on voltage-regulating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106211431A true CN106211431A (en) | 2016-12-07 |
Family
ID=57477522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610551912.7A Pending CN106211431A (en) | 2016-07-13 | 2016-07-13 | A kind of LED digitizer tablet soft light power supply based on voltage-regulating circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106211431A (en) |
-
2016
- 2016-07-13 CN CN201610551912.7A patent/CN106211431A/en active Pending
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Application publication date: 20161207 |