CN105958848A - Differential amplification circuit-based base quiescent current limiting-type constant current power supply - Google Patents
Differential amplification circuit-based base quiescent current limiting-type constant current power supply Download PDFInfo
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- CN105958848A CN105958848A CN201610416822.7A CN201610416822A CN105958848A CN 105958848 A CN105958848 A CN 105958848A CN 201610416822 A CN201610416822 A CN 201610416822A CN 105958848 A CN105958848 A CN 105958848A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a differential amplification circuit-based base quiescent current limiting-type constant current power supply. The differential amplification circuit-based base quiescent current limiting-type constant current power supply is characterized by mainly comprising a control chip U3, a transformer T1, an integrated voltage stabilizing circuit, a diode rectifier U1, a polar capacitor C1, a triode VT1, a diode D2, a polar capacitor C4, a differential amplification circuit, a reference voltage output circuit and an offset current adjustment circuit, wherein the differential amplification circuit is connected between the integrated voltage stabilizing circuit and an emitter of the triode VT1 in series; the reference voltage output circuit is connected with a collector of the triode VT1 and the control chip U3 separately; and the offset current adjustment circuit is connected between an OUT pin of the control chip U3 and the reference voltage output circuit in series. By the differential amplification circuit-based base quiescent current limiting-type constant current power supply, power consumption of power supply voltage and current can be reduced; and ripples in the current can be effectively eliminated, so that the condition that the differential amplification circuit-based base quiescent current limiting-type constant current power supply can output stable voltage and current is ensured; and nonlinear distortion of triangle wave voltage is effectively prevented.
Description
Technical field
The present invention relates to electronic applications, specifically, be a kind of base stage Static Electro based on differential amplifier circuit
Ductility limit standard 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 base stage quiescent current restraint-type constant current source.
The present invention is achieved through the following technical solutions: a kind of base stage quiescent current based on differential amplifier circuit
Restraint-type constant current source, mainly by control chip U3, transformator T, diode rectifier U1, positive pole and two
The cathode output end of pole pipe commutator U1 is connected, the cathode output end phase of negative pole and diode rectifier U1
The polar capacitor C1 connected, audion VT1, P pole is managed with the VCC of control chip U3 after resistance R5
The diode D2 that foot is connected, N pole is connected with the TRI pin of control chip U3, positive pole and audion
The polar capacitor C4 that the base stage of VT1 is connected, negative pole is connected with the RES pin of control chip U3, with
The integrated stable voltage circuit that diode rectifier U1 is connected, is serially connected in integrated stable voltage circuit and audion VT1
Go crazy between differential amplifier circuit, respectively with colelctor electrode and the control chip U3 of audion VT1
The reference voltage output circuit being connected, and it is serially connected in OUT pin and the reference voltage of control chip U3
Drift current between output circuit adjusts circuit composition；The secondary inductance coil of described transformator T of the same name
End is connected with one of them input of diode rectifier U1, its non-same polarity and diode rectifier
Another input of U1 is connected；The GND pin ground connection of described control chip U3；Described audion
The base stage of VT1 is connected with the VCC pin of control chip U3；Described integrated stable voltage circuit and reference voltage
Output circuit is connected.
Described drift current adjusts electricity routing amplifier P, audion VT7, audion VT8, P pole and three
The base stage of pole pipe VT7 is connected, N pole sequentially after resistance R25 and adjustable resistance R26 with audion VT7
The diode D8 that is connected of emitter stage, positive pole base stage with audion VT7 after resistance R27 is connected,
Negative pole be connected with the negative pole of amplifier P after the polar capacitor C12 of ground connection, the output of positive pole and amplifier P
The polar capacitor C13 that end is connected, negative pole negative pole with amplifier P after resistance R28 is connected, one end
Be connected with the negative electrode of amplifier P, the side of resistance R30, the N pole of other end ground connection and audion VT8
Diode D9, the P pole warp that formula is attached, P pole positive pole with amplifier P after resistance R29 is connected
After resistance R32 the emitter stage with audion VT8 be connected, N pole after polar capacitor C14 with audion
The Zener diode D10 that the colelctor electrode of VT8 is connected, and the P pole phase of one end and Zener diode D10
The resistance R31 composition that connection, the other end are connected with the anelectrode of amplifier P；Described amplifier P is just
Electrode is connected with the junction point of resistance R25 with adjustable resistance R26, its positive pole can with adjustable resistance R26's
Tune end is connected；The grounded collector of described audion VT8, its base stage are connected with the outfan of amplifier P
Connect；The base stage of described audion VT7 is connected with the OUT pin of control chip U3；Described voltage stabilizing two pole
The N pole of pipe D10 adjusts the outfan of circuit as drift current and 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 N pole of Zener diode D10,
The emitter stage phase of resistance R13, the P pole that the other end is connected with the base stage of audion VT3 and audion VT3
The diode D4 that connection, N pole are connected with the base stage of audion VT2, one end is sent out with audion VT2's
Resistance R11, the P pole that emitter-base bandgap grading is connected, one end is connected with the THR pin of control chip U3 is through resistance
After R14 the base stage with audion VT2 be connected, N pole after resistance R12 with the colelctor electrode of audion VT2
The Zener diode D5 being connected, and positive pole after resistance R10 with the THR pin phase of control chip U3
The N of connection, negative pole and Zener diode D5 is collectively forming the polarity of the outfan of reference voltage output circuit
Electric capacity 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 electricity
There is non-linear distortion in ripple.
(2) present invention can carry out offset correction to the electric current of output, to prevent from being produced output electricity by current source
Stream deviation reference current value, ensures that the stability of the electric current that the present invention exports.
(3) 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.
(4) 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.
(5) 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.
Fig. 3 is the electrical block diagram of the drift current adjustment 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, drift current adjusts
Circuit, 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.The OUT pin that drift current adjustment circuit is serially connected in control chip U3 is defeated with reference voltage
Go out between circuit.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 N pole of Zener diode D10, 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.
As it is shown on figure 3, described drift current adjusts electricity routing amplifier P, audion VT7, audion VT8,
Resistance R25, adjustable resistance R26, resistance R27, resistance R28, resistance R29, resistance R30, resistance
R31, resistance R32, polar capacitor C12, polar capacitor C13, polar capacitor C14, diode D8, two
Pole pipe D9, and Zener diode D10 composition.
During connection, the P pole of diode D8 is connected with the base stage of audion VT7, its N pole is sequentially through electricity
It is connected with the emitter stage of audion VT7 after resistance R25 and adjustable resistance R26.The positive pole of polar capacitor C12
After after resistance R27, the base stage with audion VT7 is connected, its negative pole is connected with the negative pole of amplifier P
Ground connection.The positive pole of polar capacitor C13 is connected with the outfan of amplifier P, its negative pole is after resistance R28
It is connected with the negative pole of amplifier P.
Meanwhile, one end of resistance R30 be connected with the negative electrode of amplifier P, its other end ground connection.Two poles
The N pole of pipe D9 and the mode of audion VT8 are attached, its P pole after resistance R29 with amplifier P
Positive pole be connected.The P pole of Zener diode D10 after resistance R32 with the emitter stage phase of audion VT8
Connect, its N pole colelctor electrode with audion VT8 after polar capacitor C14 is connected.The one of resistance R31
End is connected with the P pole of Zener diode D10, its other end is connected with the anelectrode of amplifier P.
The anelectrode of described amplifier P is connected with the junction point of resistance R25 with adjustable resistance R26, its just
Pole is connected with the adjustable end of adjustable resistance R26；The grounded collector of described audion VT8, its base stage with
The outfan of amplifier P is connected；The base stage of described audion VT7 and the OUT pin of control chip U3
It is connected；The N pole of described Zener diode D10 adjusts outfan and the benchmark of circuit as drift current
Voltage follower circuit 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 (7)
1. a base stage quiescent current restraint-type 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 with diode rectifier U1's
The polar capacitor that cathode output end is connected, negative pole is connected with the cathode output end of diode rectifier U1
C1, audion VT1, P pole VCC pin with control chip U3 after resistance R5 is connected, N pole
The diode D2 being connected with the TRI pin of control chip U3, positive pole is connected with the base stage of audion VT1
Connect, polar capacitor C4 that negative pole is connected with the RES pin of control chip U3, with diode rectifier
The integrated stable voltage circuit that U1 is connected, is serially connected between the going crazy of integrated stable voltage circuit and audion VT1
Differential amplifier circuit, the benchmark being connected with colelctor electrode and the control chip U3 of audion VT1 respectively electricity
Voltage follower circuit, and be serially connected between OUT pin and the reference voltage output circuit of control chip U3
Drift current adjusts circuit composition；The Same Name of Ends of the secondary inductance coil of described transformator T and diode rectification
One of them input of device U1 is connected, another input of its non-same polarity and diode rectifier U1
End is connected；The GND pin ground connection of described control chip U3；The base stage of described audion VT1 and control
The VCC pin of chip U3 is connected；Described integrated stable voltage circuit is connected with reference voltage output circuit.
A kind of base stage quiescent current restraint-type based on differential amplifier circuit the most according to claim 1
Constant current source, it is characterised in that described drift current adjusts electricity routing amplifier P, audion VT7, three poles
Pipe VT8, P pole is connected with the base stage of audion VT7, N pole is sequentially through resistance R25 and adjustable resistance R26
The diode D8 that emitter stage with audion VT7 is connected afterwards, positive pole after resistance R27 with audion VT7
Base stage be connected, negative pole be connected with the negative pole of amplifier P after the polar capacitor C12 of ground connection, positive pole with
The polarity that the outfan of amplifier P is connected, negative pole negative pole with amplifier P after resistance R28 is connected
Electric capacity C13, one end is connected with the negative electrode of amplifier P, resistance R30, the N pole and three of other end ground connection
Two poles that the mode of pole pipe VT8 is attached, P pole positive pole with amplifier P after resistance R29 is connected
Pipe D9, P pole emitter stage with audion VT8 after resistance R32 is connected, N pole is through polar capacitor C14
The Zener diode D10 that colelctor electrode with audion VT8 is connected afterwards, and one end and Zener diode D10
The resistance R31 that P pole is connected, the other end is connected with the anelectrode of amplifier P composition；Described amplification
The anelectrode of device P is connected with the junction point of resistance R25 with adjustable resistance R26, its positive pole and adjustable resistance
The adjustable end of R26 is connected；The grounded collector of described audion VT8, its base stage are defeated with amplifier P's
Go out end to be connected；The base stage of described audion VT7 is connected with the OUT pin of control chip U3；Described
The N pole of Zener diode D10 adjusts outfan and the reference voltage output circuit of circuit as drift current
It is connected.
A kind of base stage quiescent current restraint-type based on differential amplifier circuit the most according to claim 2
Constant current source, it is characterised in that described differential amplifier circuit is by audion VT4, audion VT5, three poles
Pipe VT6, positive pole is connected with the base stage of audion VT5, negative pole as differential amplifier circuit input also
Polar capacitor C7, the P pole being connected with integrated stable voltage circuit negative with polar capacitor C7 after resistance R15
The diode D6 that pole is connected, N pole base stage with audion VT5 after adjustable resistance R16 is connected,
One end is connected with the base stage of audion VT5, the resistance R17 of other end ground connection, one end and audion VT4
Resistance R21, the N pole that base stage is connected, the other end is connected with the colelctor electrode of audion VT5 through resistance
Two poles that after R20, the base stage with audion VT6 is connected, P pole is connected with the colelctor electrode of audion VT5
Pipe D7, negative pole emitter stage with audion VT6 after resistance R23 is connected, positive pole is after resistance R22
The polar capacitor C8 being connected with the colelctor electrode of audion VT4, positive pole is connected with the negative pole of polar capacitor C8
Connect, the polar capacitor C11 of minus earth, positive pole emitter stage with audion VT5 after resistance R19 is connected
Connect, negative pole as the outfan of differential amplifier circuit and be connected with the emitter stage of audion VT1 polarity electricity
Hold C10, one end is connected with the positive pole of polar capacitor C10, the resistance R24 of other end ground connection, positive pole and
The emitter stage of audion VT5 is connected, the polar capacitor C9 of minus earth, and one end and polar capacitor
The resistance R18 composition that the negative pole of C9 is connected, the other end is connected with the emitter stage of audion VT5；Described
The positive pole of polar capacitor C10 is connected with the colelctor electrode of audion VT6.
A kind of base stage quiescent current restraint-type based on differential amplifier circuit the most according to claim 3
Constant current source, it is characterised in that described integrated stable voltage circuit is by voltage stabilizing chip U2, one end and voltage stabilizing chip
The resistance that the VIN pin of U2 is connected, the other end is connected with the cathode output end of diode rectifier U1
R1, N pole GND pin with voltage stabilizing chip U2 after resistance R2 is connected, P pole and diode rectification
The Zener diode D1 that the cathode output end of device U1 is connected, the N pole phase of positive pole and Zener diode D1
The polar capacitor that after connection, ground connection, negative pole OUT pin with voltage stabilizing chip U2 after resistance R3 is connected
C2, and positive pole OUT pin with voltage stabilizing chip U2 after resistance R4 is connected, negative pole is through resistance R9
The polar capacitor C3 composition being connected with reference voltage output circuit afterwards；The positive pole of described polar capacitor C3 with
The negative pole of polar capacitor C7 is connected.
A kind of base stage quiescent current restraint-type based on differential amplifier circuit the most according to claim 4
Constant current source, it is characterised in that described reference voltage output circuit is by audion VT2, audion VT3, P
Pole is connected with the colelctor electrode of audion VT1, N pole after resistance R6 with the DIS pin of control chip U3
The diode D3 being connected, positive pole is sequentially extremely connected through resistance R7 N with diode D3 after resistance R8
Connect, polar capacitor C5 that negative pole is connected with the colelctor electrode of audion VT3, one end and Zener diode D10
Resistance R13, the P pole that N pole is connected, the other end is connected with the base stage of audion VT3 and audion
The diode D4 that the emitter stage of VT3 is connected, N pole is connected with the base stage of audion VT2, one end and three
The resistance R11 that the emitter stage of pole pipe VT2 is connected, one end is connected with the THR pin of control chip U3,
P 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 base stage quiescent current restraint-type based on differential amplifier circuit the most according to claim 5
Constant current source, it is characterised in that described voltage stabilizing chip U2 is the integrated chip of AN7812.
A kind of base stage quiescent current restraint-type based on differential amplifier circuit the most according to claim 5
Constant current source, it is characterised in that described control chip U3 is the integrated chip of NE555.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610416822.7A CN105958848A (en) | 2016-06-12 | 2016-06-12 | Differential amplification circuit-based base quiescent current limiting-type constant current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610416822.7A CN105958848A (en) | 2016-06-12 | 2016-06-12 | Differential amplification circuit-based base quiescent current limiting-type constant current power supply |
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| Publication Number | Publication Date |
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| CN105958848A true CN105958848A (en) | 2016-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610416822.7A Pending CN105958848A (en) | 2016-06-12 | 2016-06-12 | Differential amplification circuit-based base quiescent current limiting-type constant current power supply |
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| Country | Link |
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| CN (1) | CN105958848A (en) |
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2016
- 2016-06-12 CN CN201610416822.7A patent/CN105958848A/en active Pending
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