CN105974986A - Integrated voltage stabilizing type constant-current power source based on differential amplification circuit - Google Patents
Integrated voltage stabilizing type constant-current power source based on differential amplification circuit Download PDFInfo
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- CN105974986A CN105974986A CN201610416932.3A CN201610416932A CN105974986A CN 105974986 A CN105974986 A CN 105974986A CN 201610416932 A CN201610416932 A CN 201610416932A CN 105974986 A CN105974986 A CN 105974986A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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Abstract
The invention discloses an integrated voltage stabilizing type constant-current power source based on a differential amplification circuit. The integrated voltage stabilizing type constant-current power source is characterized by being mainly composed of a control chip U3, a transformer T, an integrated voltage stabilizing circuit, a diode rectifier U1, a polar capacitor C1, a triode VT1, a diode D2, a polar capacitor C4, the differential amplification circuit and a reference voltage output circuit; a positive electrode of the polar capacitor C4 is connected with a base electrode of the triode VT1, a negative electrode of the polar capacitor C4 is connected with an RES pin of the control chip U3, the differential amplification circuit is connected between the integrated voltage stabilizing circuit and the triode VT1 in series, and the reference voltage output circuit is connected with a collector electrode of the triode VT1 and the control chip U3. According to the integrated voltage stabilizing type constant-current power source, the power consumption of the voltages and currents of the power source can be reduced, ripple waves in the currents can be effectively eliminated, therefore, it is ensured that stable voltages and currents can be output by the power source, and it is effectively avoided that non-linear distortion happens to triangular wave voltages.
Description
Technical field
The present invention relates to electronic applications, specifically, be a kind of integrated voltage-stabilized formula based on differential amplifier circuit
Constant current source.
Background technology
Along with the development of science and technology, the electronic product such as TV, computer occurs in the life of people the most in a large number and works as
In, the display device such as telescreen, computer monitor all can use triangular voltage sweep circuit.But,
The most general triangular wave system is all to use analog circuit, by a constant current source electric capacity is charged and
Produce Linear Triangular wave voltage.But, there is output voltage and unstable the asking of electric current in existing constant current source
Topic, causes the electric wave of triangle wave voltage to initiate and terminal all can produce non-linear distortion in various degree.
Therefore it provides a kind of power supply that can export constant voltage and electric current is the task of top priority.
Summary of the invention
It is an object of the invention to overcome constant current source of the prior art to there is output voltage and electric current is unstable
Defect, it is provided that a kind of based on differential amplifier circuit integrated voltage-stabilized formula constant current source.
The present invention is achieved through the following technical solutions: a kind of integrated voltage-stabilized formula based on differential amplifier circuit is permanent
Stream power supply, mainly by control chip U3, transformator T, diode rectifier U1, 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, audion VT1, P pole VCC pin with control chip U3 after resistance R5 is connected,
The base stage of the diode D2 that N pole is connected with the TRI pin of control chip U3, positive pole and audion VT1
Be connected, polar capacitor C4 that negative pole is connected with the RES pin of control chip U3, with diode rectification
The integrated stable voltage circuit that device U1 is connected, is serially connected in going crazy of integrated stable voltage circuit and audion VT1
Between differential amplifier circuit, and be connected with colelctor electrode and the control chip U3 of audion VT1 respectively
Reference voltage output circuit composition；The Same Name of Ends of the secondary inductance coil of described transformator T is whole with diode
One of them input of stream device U1 is connected, its non-same polarity and diode rectifier U1 another is defeated
Enter end to be connected；The GND pin ground connection of described control chip U3；The base stage of described audion VT1 and control
The VCC pin of coremaking sheet U3 is connected；Described integrated stable voltage circuit is connected with reference voltage output circuit.
Described differential amplifier circuit is by audion VT4, audion VT5, audion VT6, positive pole and three poles
The base stage of pipe VT5 is connected, negative pole as the input of differential amplifier circuit and is connected with integrated stable voltage circuit
Polar capacitor C7, the P pole connect negative pole with polar capacitor C7 after resistance R15 is connected, N pole is through can
The diode D6 being connected with the base stage of audion VT5 after adjusting resistance R16, one end is with audion VT5's
Base stage is connected, the resistance R17 of other end ground connection, and one end is connected with the base stage of audion VT4, another
Resistance R21, the N pole that is connected with the colelctor electrode of audion VT5 of end after resistance R20 with audion VT6
The diode D7 that base stage is connected, P pole is connected with the colelctor electrode of audion VT5, negative pole is through resistance
After R23 the emitter stage with audion VT6 be connected, positive pole after resistance R22 with the current collection of audion VT4
The polar capacitor C8 that pole is connected, positive pole is connected with the negative pole of polar capacitor C8, the polarity of minus earth
Electric capacity C11, positive pole emitter stage with audion VT5 after resistance R19 is connected, negative pole is put as difference
The outfan of big circuit the polar capacitor C10 being connected with the emitter stage of audion VT1, one end and polarity
The positive pole of electric capacity C10 is connected, the resistance R24 of other end ground connection, positive pole and the emitter stage of audion VT5
Be connected, the polar capacitor C9 of minus earth, and one end is connected, separately with the negative pole of polar capacitor C9
The resistance R18 composition that one end is connected with the emitter stage of audion VT5；The positive pole of described polar capacitor C10
It is connected with the colelctor electrode of audion VT6.
Described integrated stable voltage circuit is connected with the VIN pin of voltage stabilizing chip U2 by voltage stabilizing chip U2, one end
Connect, resistance R1, N pole that the other end is connected with the cathode output end of diode rectifier U1 is through resistance R2
Afterwards the GND pin with voltage stabilizing chip U2 be connected, the cathode output end phase of P pole and diode rectifier U1
Connect Zener diode D1, positive pole be connected with the N pole of Zener diode D1 after ground connection, negative pole through electricity
The polar capacitor C2 being connected with the OUT pin of voltage stabilizing chip U2 after resistance R3, and positive pole is through resistance R4
Afterwards the OUT pin with voltage stabilizing chip U2 be connected, negative pole after resistance R9 with reference voltage output circuit
The polar capacitor C3 composition being connected；The positive pole of described polar capacitor C3 and the negative pole phase of polar capacitor C7
Connect.
Described reference voltage output circuit is by audion VT2, audion VT3, P pole and audion VT1
The diode that colelctor electrode is connected, N pole is connected with the DIS pin of control chip U3 after resistance R6
D3, positive pole is sequentially connected through resistance R7 N pole with diode D3 after resistance R8, negative pole and three poles
The polar capacitor C5 that the colelctor electrode of pipe VT3 is connected, one end is connected with the OUT pin of control chip U3
Connect, the transmitting of resistance R13, P pole that the other end is connected with the base stage of audion VT3 and audion VT3
The diode D4 that pole is connected, N pole is connected with the base stage of audion VT2, one end and audion VT2
Resistance R11, the P pole that emitter stage is connected, one end is connected with the THR pin of control chip U3 through electricity
Be connected with the base stage of audion VT2 after resistance R14, N pole after resistance R12 with the collection of audion VT2
The Zener diode D5 that electrode is connected, and positive pole manages with the THR of control chip U3 after resistance R10
Foot is connected, the N of negative pole and Zener diode D5 is collectively forming the outfan of reference voltage output circuit
Polar capacitor C6 forms.
For the practical effect of the present invention, described control chip U3 the most preferentially uses the integrated core of NE555
Sheet realizes；The most described voltage stabilizing chip U2 the most preferentially have employed the integrated chip of AN7812 and realizes.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) present invention can reduce the power consumption of supply voltage and electric current, and can effectively eliminate the stricture of vagina in electric current
Ripple, ensures that the present invention can export stable voltage and current, is effectively prevented triangle wave voltage
There is non-linear distortion in electric wave.
(2) present invention can improve the symmetry of voltage and current parameter, and burning voltage and electric current is quiet effectively
State operating point, the present invention and can effectively limit base stage quiescent current, improve input resistance simultaneously, from
And improve the output voltage of the present invention and the stability of electric current.
(3) service efficiency of the present invention is up to more than 95%, so that the present invention effectively raises triangular wave
Voltage amplitude and power utilization rate.
(4) the voltage stabilizing chip of the present invention have employed the integrated chip of AN7812 and realizes, the workability of this chip
Can be stable, this chip can effectively improve after combining with the electronic component of periphery the present invention output voltage and
The stability of electric 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 differential amplifier 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 U3, transformator T, audion VT1, diode
Commutator U1, resistance R5, polar capacitor C1, polar capacitor C4, diode D2, differential amplifier circuit,
Integrated stable voltage circuit, and reference voltage output circuit composition.
During connection, 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.The P pole of diode D2 is after resistance R5
Be connected with the VCC pin of control chip U3, its N pole is connected with the TRI pin of control chip U3.
The positive pole of polar capacitor C4 is connected with the base stage of audion VT1, the RES of its negative pole and control chip U3
Pin is connected.Integrated stable voltage circuit is connected with diode rectifier U1.Differential amplifier circuit is serially connected in collection
Become between the going crazy of mu balanced circuit and audion VT1.Reference voltage output circuit respectively with audion
The colelctor electrode of VT1 is connected with control chip U3.
One of them of the Same Name of Ends of the secondary inductance coil of described transformator T and diode rectifier U1 is defeated
Enter end be connected, its non-same polarity is connected with another input of diode rectifier U1；Described control
The GND pin ground connection of chip U3；The VCC pipe of the base stage of described audion VT1 and control chip U3
Foot is connected；Described integrated stable voltage circuit is connected with reference voltage output circuit；The described former limit of transformator T
The Same Name of Ends of inductance coil is connected with external power source respectively with non-same polarity.
Further, described integrated stable voltage circuit is by voltage stabilizing chip U2, resistance R1, resistance R2, resistance
R3, resistance R4, resistance R9, polar capacitor C2, polar capacitor C3, and Zener diode D1 form.
During connection, one end of resistance R1 is connected with the VIN pin of voltage stabilizing chip U2, its other end with
The cathode output end of diode rectifier U1 is connected.The N pole of Zener diode D1 after resistance R2 with
The GND pin of voltage stabilizing chip U2 is connected, the cathode output end phase of its P pole and diode rectifier U1
Connect.
Meanwhile, ground connection after the positive pole of polar capacitor C2 is connected with the N pole of Zener diode D1, it bears
Pole OUT pin with voltage stabilizing chip U2 after resistance R3 is connected.The positive pole of polar capacitor C3 is through resistance
After R4, the OUT pin with voltage stabilizing chip U2 is connected, its negative pole exports with reference voltage after resistance R9
Circuit is connected.The positive pole of described polar capacitor C3 is connected with the negative pole of polar capacitor C7.
Further, described reference voltage output circuit is by audion VT2, audion VT3, resistance
R6, resistance R7, resistance R8, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14,
Polar capacitor C5, polar capacitor C6, diode D3, diode D4, and Zener diode D5 form.
During connection, the P pole of diode D3 is connected with the colelctor electrode of audion VT1, its N pole is through resistance
After R6, the DIS pin with control chip U3 is connected.The positive pole of polar capacitor C5 sequentially through resistance R7 and
After resistance R8, the N pole with diode D3 is connected, its negative pole is connected with the colelctor electrode of audion VT3.
One end of resistance R13 is connected with the OUT pin of control chip U3, its other end and audion VT3
Base stage is connected.The P pole of diode D4 is connected with the emitter stage of audion VT3, its N pole and three poles
The base stage of pipe VT2 is connected.One end of resistance R11 is connected with the emitter stage of audion VT2, its one end
It is connected with the THR pin of control chip U3.
Meanwhile, the P pole of Zener diode D5 base stage with audion VT2 after resistance R14 be connected,
Its N pole colelctor electrode with audion VT2 after resistance R12 is connected.The positive pole of polar capacitor C6 is through electricity
Be connected with the THR pin of control chip U3 after resistance R10, its negative pole is total to the N of Zener diode D5
With the outfan forming reference voltage output circuit.
As in figure 2 it is shown, described differential amplifier circuit is by audion VT4, audion VT5, audion VT6,
Resistance R15, adjustable resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, resistance
R21, resistance R22, resistance R23, resistance R24, polar capacitor C7, polar capacitor C8, polar capacitor
C9, polar capacitor C10, polar capacitor C11, diode D6, and diode D7 form.
During connection, the positive pole of polar capacitor C7 is connected with the base stage of audion VT5, its negative pole is as difference
Divide the input of amplifying circuit and be connected with integrated stable voltage circuit.The P pole of diode D6 is through resistance R15
Afterwards the negative pole with polar capacitor C7 be connected, its N pole after adjustable resistance R16 with the base of audion VT5
Pole is connected.One end of resistance R17 is connected with the base stage of audion VT5, its other end ground connection.Resistance
One end of R21 is connected with the base stage of audion VT4, its other end is connected with the colelctor electrode of audion VT5
Connect.The N pole of diode D7 base stage with audion VT6 after resistance R20 is connected, its P pole and three
The colelctor electrode of pole pipe VT5 is connected.
Wherein, the negative pole of polar capacitor C8 emitter stage with audion VT6 after resistance R23 be connected,
Its positive pole colelctor electrode with audion VT4 after resistance R22 is connected.The positive pole of polar capacitor C11 and pole
The negative pole of property electric capacity C8 is connected, its minus earth.The positive pole of polar capacitor C10 after resistance R19 with
The emitter stage of audion VT5 is connected, its negative pole as differential amplifier circuit outfan and and audion
The emitter stage of VT1 is connected.
Meanwhile, one end of resistance R24 be connected with the positive pole of polar capacitor C10, its other end ground connection.Pole
The property positive pole of electric capacity C9 is connected with the emitter stage of audion VT5, its minus earth.The one of resistance R18
End is connected with the negative pole of polar capacitor C9, its other end is connected with the emitter stage of audion VT5.Institute
The colelctor electrode of the positive pole and audion VT6 of stating polar capacitor C10 is connected.
During operation, the present invention can reduce the power consumption of supply voltage and electric current, and can effectively eliminate in electric current
Ripple, ensure that the present invention can export stable voltage and current, be effectively prevented triangular wave electricity
There is non-linear distortion in the electric wave of pressure.The present invention can improve the symmetry of voltage and current parameter, the most surely
Determine the quiescent point of voltage and current, the present invention and can effectively limit base stage quiescent current, carry simultaneously
High input resistance, thus improve the output voltage of the present invention and the stability of electric current.
Meanwhile, the service efficiency of the present invention is up to more than 95%, so that the present invention effectively raises triangle
Wave voltage amplitude and power utilization rate.The voltage stabilizing chip U2 of the present invention have employed the integrated chip of AN7812 and comes real
Existing, the stable work in work of this chip, this chip can effectively improve after combining with peripheral electronic component
The output voltage of the present invention and the stability of electric current.For the practical effect of the present invention, described control core
Sheet U3 the most preferentially uses the integrated chip of high performance NE555 to realize.
According to above-described embodiment, can well realize the present invention.
Claims (6)
1. an integrated voltage-stabilized formula constant current source based on differential amplifier circuit, it is characterised in that mainly by
Control chip U3, transformator T, diode rectifier U1, positive pole is defeated with the positive pole of diode rectifier U1
Go out end be connected, polar capacitor C1 that negative pole is connected with the cathode output end of diode rectifier U1, three
Pole pipe VT1, P pole VCC pin with control chip U3 after resistance R5 is connected, N pole with control core
The diode D2 that the TRI pin of sheet U3 is connected, positive pole is connected with the base stage of audion VT1, negative pole
The polar capacitor C4 being connected with the RES pin of control chip U3, is connected with diode rectifier U1
Integrated stable voltage circuit, the difference being serially connected between the going crazy of integrated stable voltage circuit and audion VT1 is put
Big circuit, and defeated with the reference voltage that the colelctor electrode of audion VT1 and control chip U3 are connected respectively
Go out circuit composition；The Same Name of Ends of the secondary inductance coil of described transformator T is with diode rectifier U1 wherein
One input is connected, its non-same polarity is connected with another input of diode rectifier U1；Institute
State the GND pin ground connection of control chip U3；The base stage of described audion VT1 and the VCC of control chip U3
Pin is connected；Described integrated stable voltage circuit is connected with reference voltage output circuit.
A kind of integrated voltage-stabilized formula constant current source based on differential amplifier circuit the most according to claim 1,
It is characterized in that, described differential amplifier circuit is by audion VT4, audion VT5, audion VT6, just
Pole is connected with the base stage of audion VT5, negative pole as differential amplifier circuit input and and integrated voltage-stabilized
Polar capacitor C7, the P pole that circuit is connected negative pole with polar capacitor C7 after resistance R15 is connected, N
The diode D6 that pole base stage with audion VT5 after adjustable resistance R16 is connected, one end and audion
The base stage of VT5 is connected, the resistance R17 of other end ground connection, one end is connected with the base stage of audion VT4,
Resistance R21, the N pole that the other end is connected with the colelctor electrode of audion VT5 after resistance R20 with audion
The diode D7 that the base stage of VT6 is connected, P pole is connected with the colelctor electrode of audion VT5, negative pole is through electricity
Resistance R23 after be connected with the emitter stage of audion VT6, positive pole after resistance R22 with audion VT4's
Polar capacitor C8 that colelctor electrode is connected, positive pole is connected with the negative pole of polar capacitor C8, minus earth
Polar capacitor C11, positive pole emitter stage with audion VT5 after resistance R19 is connected, negative pole is as difference
The outfan of point amplifying circuit the polar capacitor C10 being connected with the emitter stage of audion VT1, one end with
The positive pole of polar capacitor C10 is connected, the resistance R24 of other end ground connection, and positive pole is sent out with audion VT5's
Emitter-base bandgap grading is connected, the polar capacitor C9 of minus earth, and one end is connected with the negative pole of polar capacitor C9,
The resistance R18 composition that the other end is connected with the emitter stage of audion VT5；Described polar capacitor C10 is just
Pole is connected with the colelctor electrode of audion VT6.
A kind of integrated voltage-stabilized formula constant current source based on differential amplifier circuit the most according to claim 2,
It is characterized in that, described integrated stable voltage circuit is by the VIN pipe of voltage stabilizing chip U2, one end and voltage stabilizing chip U2
Resistance R1, the N pole warp that foot is connected, the other end is connected with the cathode output end of diode rectifier U1
After resistance R2 the GND pin with voltage stabilizing chip U2 be connected, the negative pole of P pole and diode rectifier U1
The Zener diode D1 that outfan is connected, positive pole be connected with the N pole of Zener diode D1 after ground connection,
The polar capacitor C2 that negative pole OUT pin with voltage stabilizing chip U2 after resistance R3 is connected, and positive pole
After resistance R4 the OUT pin with voltage stabilizing chip U2 be connected, negative pole after resistance R9 with reference voltage
The polar capacitor C3 composition that output circuit is connected；The positive pole of described polar capacitor C3 and polar capacitor C7
Negative pole be connected.
A kind of integrated voltage-stabilized formula constant current source based on differential amplifier circuit the most according to claim 3,
It is characterized in that, described reference voltage output circuit is by audion VT2, audion VT3, P pole and three poles
The colelctor electrode of pipe VT1 is connected, N pole is connected with the DIS pin of control chip U3 after resistance R6
Diode D3, positive pole is sequentially connected through resistance R7 N pole with diode D3 after resistance R8, negative pole
The OUT pipe of the polar capacitor C5 being connected with the colelctor electrode of audion VT3, one end and control chip U3
Resistance R13, the P pole that foot is connected, the other end is connected with the base stage of audion VT3 and audion VT3
The diode D4 that emitter stage is connected, N pole is connected with the base stage of audion VT2, one end and audion
The resistance R11, P that the emitter stage of VT2 is connected, one end is connected with the THR pin of control chip U3
Pole base stage with audion VT2 after resistance R14 is connected, N pole after resistance R12 with audion VT2
The Zener diode D5 that is connected of colelctor electrode, and positive pole after resistance R10 with the THR of control chip U3
Pin is connected, the N of negative pole and Zener diode D5 is collectively forming the outfan of reference voltage output circuit
Polar capacitor C6 composition.
A kind of integrated voltage-stabilized formula constant current source based on differential amplifier circuit the most according to claim 4,
It is characterized in that, described voltage stabilizing chip U2 is the integrated chip of AN7812.
A kind of integrated voltage-stabilized formula constant current source based on differential amplifier circuit the most according to claim 4,
It is characterized in that, described control chip U3 is the integrated chip of NE555.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610416932.3A CN105974986A (en) | 2016-06-12 | 2016-06-12 | Integrated voltage stabilizing type constant-current power source based on differential amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610416932.3A CN105974986A (en) | 2016-06-12 | 2016-06-12 | Integrated voltage stabilizing type constant-current power source based on differential amplification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105974986A true CN105974986A (en) | 2016-09-28 |
Family
ID=57011119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610416932.3A Pending CN105974986A (en) | 2016-06-12 | 2016-06-12 | Integrated voltage stabilizing type constant-current power source based on differential amplification circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105974986A (en) |
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2016
- 2016-06-12 CN CN201610416932.3A patent/CN105974986A/en active Pending
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Application publication date: 20160928 |
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