CN105958847A - Overvoltage overcurrent protection circuit based integrated voltage-stabilizing constant-current power supply - Google Patents

Overvoltage overcurrent protection circuit based integrated voltage-stabilizing constant-current power supply Download PDF

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Publication number
CN105958847A
CN105958847A CN201610412918.6A CN201610412918A CN105958847A CN 105958847 A CN105958847 A CN 105958847A CN 201610412918 A CN201610412918 A CN 201610412918A CN 105958847 A CN105958847 A CN 105958847A
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CN
China
Prior art keywords
audion
pole
resistance
voltage
diode
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Pending
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CN201610412918.6A
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Chinese (zh)
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不公告发明人
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Chengdu Feikairui Technology Co Ltd
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Chengdu Feikairui Technology Co Ltd
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Priority to CN201610412918.6A priority Critical patent/CN105958847A/en
Publication of CN105958847A publication Critical patent/CN105958847A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention discloses an overvoltage overcurrent protection circuit based integrated voltage-stabilizing constant-current power supply. The integrated voltage-stabilizing constant-current power supply is characterized by mainly comprising a control chip U3, a transformer T, a diode rectifier U1, a polar capacitor C1, a triode VT1, a diode D2, a polar capacitor C4, the overvoltage overcurrent protection circuit, an integrated voltage-stabilizing circuit and a reference voltage output circuit, wherein the overvoltage overcurrent protection circuit is connected between the base electrode of the triode VT1 and the VCC pin of the control chip U3 in series; the integrated voltage-stabilizing circuit is connected between the diode rectifier U1 and the emitting electrode of the triode VT1 in series; and the reference voltage output circuit is connected with the collector electrode of the triode VT1 and the control chip U3 separately. By adoption of the integrated voltage-stabilizing constant-current power supply, the voltage and current power consumption of the power supply can be effectively lowered, and ripple wave in the current can be effectively eliminated so as to ensure that the integrated voltage-stabilizing constant-current power supply can output stable voltage and current; and in addition, nonlinear distortion of the triangular wave voltage can be effectively prevented.

Description

A kind of integrated voltage-stabilized formula constant current source based on over-voltage over-current protection circuit
Technical field
The present invention relates to electronic applications, specifically, be a kind of based on over-voltage over-current protection circuit integrated surely Pressure type 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 over-voltage over-current protection circuit integrated voltage-stabilized formula constant current source.
The present invention is achieved through the following technical solutions: a kind of integrated voltage-stabilized based on over-voltage over-current protection circuit Formula constant current source, mainly by control chip U3, transformator T, diode rectifier U1, positive pole and diode The cathode output end of commutator U1 is connected, negative pole is connected with the cathode output end of diode rectifier U1 Polar capacitor C1, audion VT1, P pole after resistance R5 with the VCC pin phase of control chip U3 The diode D2 that connection, N pole are connected with the TRI pin of control chip U3, positive pole and audion VT1 The polar capacitor C4 that base stage is connected, negative pole is connected with the RES pin of control chip U3, be serially connected in Over-voltage over-current protection circuit between base stage and the VCC pin of control chip U3 of audion VT1, concatenation Integrated stable voltage circuit between the emitter stage of diode rectifier U1 and audion VT1, and respectively with The reference voltage output circuit composition that the colelctor electrode of audion VT1 is connected with control chip U3；Described change The Same Name of Ends of the secondary inductance coil of depressor T is connected with one of them input of diode rectifier U1, Its non-same polarity is connected with another input of diode rectifier U1；Described control chip U3's GND pin ground connection；Described integrated stable voltage circuit is connected with reference voltage output circuit.
Described over-voltage over-current protection circuit is by audion VT4, audion VT5, audion VT6, P pole warp After resistance R20, the base stage with audion VT5 is connected, N pole is connected with the base stage of audion VT1 two Pole pipe D6, positive pole is connected with the emitter stage of audion VT5, the colelctor electrode phase of negative pole and audion VT4 Connect polar capacitor C9, positive pole is connected with the colelctor electrode of audion VT4, negative pole after resistance R16 and The polar capacitor C7 that the emitter stage of audion VT4 is connected, one end is connected with the colelctor electrode of audion VT4 Connect, the resistance R15 of other end ground connection, positive pole base stage with audion VT4 after resistance R18 is connected, Polar capacitor C8, N pole that negative pole emitter stage with audion VT4 after resistance R17 is connected and audion Two poles that the colelctor electrode of VT6 is connected, P pole colelctor electrode with audion VT4 after resistance R19 is connected Pipe D7, positive pole is connected with the colelctor electrode of audion VT5, negative pole is sequentially through resistance R22 and adjustable resistance The polar capacitor C10 that after R23, emitter stage with audion VT6 is connected, and one end and audion VT6 The resistance R21 that base stage is connected, the other end is connected with the adjustable end of adjustable resistance R23 composition；Described The P pole of diode D6 is connected with the colelctor electrode of audion VT4；The emitter stage of described audion VT6 with The negative pole of polar capacitor C8 is connected, and the grounded emitter of audion VT6；Described polar capacitor C10 Negative pole as the outfan of over-voltage over-current protection circuit and be connected with the VCC pin of control chip U3.
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 emitter stage phase of audion VT1 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) current ripple high in the high voltage pulse in input voltage and electric current can effectively be carried out by the present invention Suppression, thus improve the stability of the voltage and current of present invention output, it is effectively prevented triangular wave electricity Extrude existing non-linear distortion.
(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 over-voltage over-current protection 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, over-voltage over-current protection Circuit, integrated stable voltage circuit, and reference voltage output circuit composition.
During connection, over-voltage over-current protection circuit is serially connected in the base stage of audion VT1 with control chip U3's Between VCC pin.The positive pole of polar capacitor C1 is connected with the cathode output end of diode rectifier U1, Its negative pole is connected with the cathode output end of diode rectifier U1.The P pole of diode D2 is through resistance R5 Be connected with the VCC pin of control chip U3 afterwards, its N pole is connected with the TRI pin of control chip U3 Connect.The positive pole of polar capacitor C4 is connected with the base stage of audion VT1, its negative pole and control chip U3 RES pin is connected.Integrated stable voltage circuit is serially connected in the transmitting of diode rectifier U1 and audion VT1 Between pole.Reference voltage output circuit is connected with colelctor electrode and the control chip U3 of audion VT1 respectively.
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；Described integrated stable voltage circuit is connected with reference voltage output circuit；Institute The Same Name of Ends stating transformator T former limit 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 emitter stage of audion VT1.
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 over-voltage over-current protection circuit is by audion VT4, audion VT5, audion VT6, resistance R15, resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, resistance R21, resistance R22, adjustable resistance R23, polar capacitor C7, polar capacitor C8, polar capacitor C9, pole Property electric capacity C10, diode D6, and diode D7 composition.
During connection, the P pole of diode D6 base stage with audion VT5 after resistance R20 is connected, it N pole is connected with the base stage of audion VT1.The positive pole of polar capacitor C9 and the emitter stage of audion VT5 Be connected, its negative pole is connected with the colelctor electrode of audion VT4.The positive pole of polar capacitor C7 and audion The colelctor electrode of VT4 is connected, its negative pole emitter stage with audion VT4 after resistance R16 is connected.Electricity Resistance R15 one end is connected with the colelctor electrode of audion VT4, its other end ground connection.
Meanwhile, the positive pole of polar capacitor C8 base stage with audion VT4 after resistance R18 be connected, its Negative pole emitter stage with audion VT4 after resistance R17 is connected.The N pole of diode D7 and audion The colelctor electrode of VT6 is connected, its P pole colelctor electrode with audion VT4 after resistance R19 is connected.Electricity One end of resistance R21 is connected with the base stage of audion VT6, the adjustable end of its other end and adjustable resistance R23 It is connected.The positive pole of polar capacitor C10 is connected with the colelctor electrode of audion VT5, its negative pole is sequentially through electricity It is connected with the emitter stage of audion VT6 after resistance R22 and adjustable resistance R23.
The P pole of described diode D6 is connected with the colelctor electrode of audion VT4；Described audion VT6 Emitter stage be connected with the negative pole of polar capacitor C8, and the grounded emitter of audion VT6；Described pole Property electric capacity C10 negative pole as the outfan of over-voltage over-current protection circuit and manage with the VCC of control chip U3 Foot 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 be effectively to the high voltage pulse in input voltage and electric current Middle high current ripple suppresses, thus improves the stability of the voltage and current of present invention output, effectively The triangle wave voltage that prevents non-linear distortion occurs.
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 over-voltage over-current protection circuit, it is characterised in that main Will be by control chip U3, transformator T, diode rectifier U1, positive pole is with diode rectifier U1 just The polar capacitor C1 that pole outfan is connected, negative pole is connected with the cathode output end of diode rectifier U1, Audion VT1, P pole VCC pin with control chip U3 after resistance R5 is connected, N pole and control The diode D2 that the TRI pin of chip U3 is connected, positive pole is connected with the base stage of audion VT1, bears The polar capacitor C4 that pole is connected with the RES pin of control chip U3, is serially connected in the base stage of audion VT1 And the over-voltage over-current protection circuit between the VCC pin of control chip U3, is serially connected in diode rectifier U1 And the integrated stable voltage circuit between the emitter stage of audion VT1, and respectively with the colelctor electrode of audion VT1 The reference voltage output circuit composition being connected with control chip U3；The secondary inductance coil of described transformator T Same Name of Ends be connected with one of them input of diode rectifier U1, its non-same polarity whole with diode Another input of stream device U1 is connected；The GND pin ground connection of described control chip U3；Described collection Mu balanced circuit is become to be connected with reference voltage output circuit.
A kind of integrated voltage-stabilized formula constant current based on over-voltage over-current protection circuit the most according to claim 1 Power supply, it is characterised in that described over-voltage over-current protection circuit is by audion VT4, audion VT5, three poles Pipe VT6, P pole base stage with audion VT5 after resistance R20 is connected, N pole is with audion VT1's The diode D6 that base stage is connected, positive pole is connected with the emitter stage of audion VT5, negative pole and audion The polar capacitor C9 that the colelctor electrode of VT4 is connected, positive pole is connected with the colelctor electrode of audion VT4, negative pole The polar capacitor C7 that emitter stage with audion VT4 is connected after resistance R16, one end and audion VT4 Colelctor electrode be connected, the resistance R15 of other end ground connection, positive pole after resistance R18 with audion VT4's The polar capacitor C8 that base stage is connected, negative pole emitter stage with audion VT4 after resistance R17 is connected, N pole is connected with the colelctor electrode of audion VT6, P pole after resistance R19 with the colelctor electrode of audion VT4 The diode D7 being connected, positive pole is connected with the colelctor electrode of audion VT5, negative pole is sequentially through resistance R22 The polar capacitor C10 being connected with emitter stage with audion VT6 after adjustable resistance R23, and one end with The resistance R21 that the base stage of audion VT6 is connected, the other end is connected with the adjustable end of adjustable resistance R23 Composition；The P pole of described diode D6 is connected with the colelctor electrode of audion VT4；Described audion VT6 Emitter stage be connected with the negative pole of polar capacitor C8, and the grounded emitter of audion VT6；Described pole Property electric capacity C10 negative pole as the outfan of over-voltage over-current protection circuit and manage with the VCC of control chip U3 Foot is connected.
A kind of integrated voltage-stabilized formula constant current based on over-voltage over-current protection circuit the most according to claim 2 Power supply, it is characterised in that described integrated stable voltage circuit is by voltage stabilizing chip U2, and one end is with voltage stabilizing chip U2's The resistance R1, N that VIN pin is connected, the other end is connected with the cathode output end of diode rectifier U1 Pole GND pin with voltage stabilizing chip U2 after resistance R2 is connected, P pole is with diode rectifier U1's The Zener diode D1 that cathode output end is connected, positive pole is connected with the N pole of Zener diode D1 and is followed by The polar capacitor C2 that ground, negative pole OUT pin with voltage stabilizing chip U2 after resistance R3 is connected, and Positive pole OUT pin with voltage stabilizing chip U2 after resistance R4 is connected, negative pole after resistance R9 with benchmark The polar capacitor C3 composition that voltage follower circuit is connected；The positive pole of described polar capacitor C3 and audion VT1 Emitter stage be connected.
A kind of integrated voltage-stabilized formula constant current based on over-voltage over-current protection circuit the most according to claim 3 Power supply, it is characterised in that described reference voltage output circuit is by audion VT2, audion VT3, P pole Be connected with the colelctor electrode of audion VT1, N pole after resistance R6 with the DIS pin phase of control chip U3 The diode D3 connected, positive pole is sequentially connected through resistance R7 N pole with diode D3 after resistance R8, The OUT of the polar capacitor C5 that negative pole is connected with the colelctor electrode of audion VT3, one end and control chip U3 Resistance R13, the P pole that pin 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 based on over-voltage over-current protection circuit the most according to claim 4 Power supply, it is characterised in that described voltage stabilizing chip U2 is the integrated chip of AN7812.
A kind of integrated voltage-stabilized formula constant current based on over-voltage over-current protection circuit the most according to claim 4 Power supply, it is characterised in that described control chip U3 is the integrated chip of NE555.
CN201610412918.6A 2016-06-12 2016-06-12 Overvoltage overcurrent protection circuit based integrated voltage-stabilizing constant-current power supply Pending CN105958847A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610412918.6A CN105958847A (en) 2016-06-12 2016-06-12 Overvoltage overcurrent protection circuit based integrated voltage-stabilizing constant-current power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610412918.6A CN105958847A (en) 2016-06-12 2016-06-12 Overvoltage overcurrent protection circuit based integrated voltage-stabilizing constant-current power supply

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Publication Number Publication Date
CN105958847A true CN105958847A (en) 2016-09-21

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