CN106921303A - A kind of switching mode power supply transformer - Google Patents
A kind of switching mode power supply transformer Download PDFInfo
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- CN106921303A CN106921303A CN201710144766.0A CN201710144766A CN106921303A CN 106921303 A CN106921303 A CN 106921303A CN 201710144766 A CN201710144766 A CN 201710144766A CN 106921303 A CN106921303 A CN 106921303A
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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
- 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
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of switching mode power supply transformer; it includes the prime protection circuit, EMI filter circuit, bridge rectifier, inverse-excitation converting circuit and the output filter circuit that are sequentially connected electrically; also include feedback circuit, clamp circuit, start-up circuit, adjustment control module and the protection circuit, oscillating circuit, the mu balanced circuit that are connected with adjustment control module; the feedback circuit be connected with the output end of output filter circuit, adjustment control module simultaneously, adjusts control module and is connected with the input of inverse-excitation converting circuit；The clamp circuit is connected with inverse-excitation converting circuit, start-up circuit simultaneously, and start-up circuit is connected with adjustment control module, protection circuit simultaneously, and the mu balanced circuit is connected with inverse-excitation converting circuit simultaneously；The adjustment control module includes UC382 chips and its peripheral circuit.The present invention is reasonable in design, easy to use, and power supply output stabilization, energy-efficient, safety and environmental protection, reliability is high.
Description
Technical field
The invention belongs to field of switch power, and in particular to a kind of switching mode power supply transformer.
Background technology
Switching mode power supply transformer is a key areas of Power Electronic Technique application, wherein high frequency switch type DC voltage-stabilizing
Power supply is due to efficiency high, small volume and the outstanding advantages such as lightweight, obtaining a wide range of applications.Switching mode power supply transformer
Control circuit can be divided into voltage-controlled type and current-control type, and the former is a single closed loop voltage control system, system response
Slowly, LFM signal rate precision higher is extremely difficult to, the latter has the advantages that incomparable compared with voltage-controlled type.
UC3842 is the Novel control device developed by Unitrode companies, is a kind of relatively more extensive electric current of domestic application
Control type pulse width modulator.So-called current source PWM device is to carry out adjusting pulsewidth by feedback current.In pwm comparator
Input is directly compared with the signal for flowing through outputting inductance coil current with error amplifier output signal, so as to adjust account for
Empty ratio makes the inductance peak point current tracking error voltage change of output and changes.Due to having Voltage loop, electric current loop bicyclic in structure
System, therefore, the voltage regulation factor of Switching Power Supply, load regulation and transient response characteristic are all improved, and are to compare reason
The new controller thought is closed.The switching mode power supply transformer based on UC3842 chip developments is small, steady using scope in the market
It is qualitative poor.
Application publication number is the patent document of CN102158093A, and title is a kind of Switching Power Supply, and it includes being input into electromagnetism
Interference filter, current rectifying and wave filtering circuit, power conversion unit, pwm control circuit and output rectifier and filter, power conversion list
Unit includes power tube S1-4, capacitor C1-3, inductor Lk and diode D1-2；Power tube S1 in power tube S1-4, power
Pipe S3 concatenation be advanced arm, and anti-parallel diodes D1-2, rise external absorption capacitor C1-3；Power tube S2, work(
Rate pipe S4 constitutes lagging leg；Output rectifier and filter include FET Sc, diode Da, diode Db, diode Dc and
Electric capacity Cc；FET Sc simultaneously meets diode Dc, then composition frequency multiplier circuit is concatenated with electric capacity Cc.This scheme can not effectively reduce
Peak voltage, circuit loss is big, and anti-electromagnetic interference capability is poor.
The content of the invention
For deficiencies of the prior art, the present invention proposes a kind of switching mode power supply transformer, with UC3842 cores
Piece is core control part, wherein, EMI filter circuit carries out LPF, and constitutes anti-string mould with prime protection circuit, resists
Common mode disturbances circuit, for suppressing normal noise and common-mode noise interference, there is very strong attenuation to electromagnetic interference；Output filter
By the way of commutation diode parallel connection, component is few, simple structure and can effectively reduce peak voltage for wave circuit,
Reduce circuit loss.
The present invention solves its technical problem, and the technical scheme for being used is：
A kind of switching mode power supply transformer, including prime protection circuit, EMI filter circuit, the bridge rectifier being sequentially connected electrically
Circuit, inverse-excitation converting circuit and output filter circuit, also including feedback circuit, clamp circuit, start-up circuit, adjustment control mould
Block and with adjustment control module be connected protection circuit, oscillating circuit, mu balanced circuit, the feedback circuit simultaneously with it is defeated
Go out output end, the adjustment control module connection of filter circuit, adjustment control module is connected with the input of inverse-excitation converting circuit；Institute
Clamp circuit is stated while be connected with inverse-excitation converting circuit, start-up circuit, start-up circuit simultaneously with adjust control module, protection circuit
Connection, the mu balanced circuit is connected with inverse-excitation converting circuit simultaneously；The adjustment control module includes UC382 chips and its periphery
Circuit.
Specifically, the prime protection circuit includes thermistor RT, piezo-resistance RV and the first capacitor C1, its
In：The two ends of piezo-resistance RV are connected with the zero line and zero line side of alternating current input power supplying Vi respectively, one end of thermistor RT
Zero line with alternating current input power supplying Vi is connected, and the other end is connected with one end of the first capacitor C1, and the first capacitor C1 is another
End is connected with the zero line side of alternating current input power supplying Vi.
Further, the EMI filter circuit include the first inductor L1, the second capacitor C2, the 3rd capacitor C3 with
And two ends of two inputs of the 4th capacitor C4, the first inductor L1 respectively with the first capacitor C1 are connected, the 3rd electric capacity
The second capacitor C2 is in parallel after device C3 connects with the 4th capacitor C4.
Further, the bridge rectifier is formed by connecting by four commutation diode D1~D4, with two exchanges
Input and two DC output ends；One ac input end of bridge rectifier is simultaneously defeated with one of first sensor L1
Go out one end connection of end, one end of the second capacitor C2, the 3rd capacitor C3, another ac input end is sensed with first simultaneously
Another output end of device L1, the other end of the second capacitor C2, one end connection of the 4th capacitor C4；Bridge rectifier
Positive DC output end is connected with inverse-excitation converting circuit 4, the earthing pole DC output end and the 3rd capacitor of bridge rectifier
The connection end connection of C3 and the 4th capacitor C4, and by wired earth.
Further, the clamp circuit includes second resistance device R2, the 5th capacitor C5, the 5th diode D5；Start
Circuit includes power switch tube S 1,3rd resistor device R3, the 6th diode D6, and inverse-excitation converting circuit includes transformer, the seven or two
Pole pipe D7, the 5th resistor R5, wherein：The transformer includes armature winding N1, feedback winding N2 and secondary windings N3；Bridge
The positive DC output end of formula rectification circuit is connected by first resistor device R1 with the power input VCC of UC3842 chips, bridge
The positive DC output end of formula rectification circuit one end simultaneously with second resistance device R2, one end of the 5th capacitor C5, it is primary around
One input connection of group N1, the negative pole of the 5th diode D5 other end, the 5th capacitor simultaneously with second resistance device R2
The other end connection of C5, the positive pole of the 5th diode D5 another input, power switch tube S 1 simultaneously with armature winding N1
Drain D connection, the source S of power switch tube S 1 is by the 4th resistor R4 ground connection, the grid G of power switch tube S 1 and the 6th
The positive pole connection of diode D6, the negative pole of the 6th diode D6 is connected with the output end OUT of UC3842 chips, 3rd resistor device R3
It is connected in parallel on the two ends of the 6th diode D6；One input of feedback winding N2 is connected with the positive pole of the 7th diode D7, and the 7th
The negative pole of diode D7 is connected with one end of the 5th resistor R5, the other end of the 5th resistor R5 and the power supply of UC3842 chips
Input VCC is connected, another input end grounding of feedback winding N2.
Further, the protection circuit includes the 6th resistor R6 and the 6th capacitor C6, wherein：6th resistor
One end of R6 is connected with the source S of power switch tube S 1, the other end of the 6th resistor R6 simultaneously with the 6th capacitor C6 one
End, the current sense end Cs connections of UC3842 chips, the other end ground connection of the 6th capacitor C6.
Further, the oscillating circuit includes the 7th resistor R7, the 7th capacitor C7, the 8th capacitor C8, wherein：
One end of 7th resistor R7, one end of the 7th capacitor C7 connect with the reference voltage output end VREF of UC3842 chips simultaneously
Connect, the other end of the 7th resistor R7 is connected with the timing end RT/CT of one end of the 8th capacitor C8, UC3842 chips, the 7th
The other end of capacitor C7, the other end of the 8th capacitor C8 are grounded simultaneously.
Yet further, the mu balanced circuit includes voltage-regulator diode D8, the 9th capacitor C9, wherein：Voltage-regulator diode
One end power input VCC, the 5th resistor R5, first with UC3842 chips simultaneously of the negative pole of D8, the 9th capacitor C9
Resistor R1 is connected, and the positive pole of voltage-regulator diode D8, the other end of the 9th capacitor C9 are grounded simultaneously.
Yet further, the output filter circuit includes the 9th diode D9, the tenth diode D10, the 8th resistor
R8, the tenth capacitor C10, the second inductor L2 and automatic recovery switch RF, wherein：9th diode D9 and the tenth diode
The positive pole of D10 is connected with an output end of secondary windings N3, the negative pole of the 9th diode D9 and the tenth diode D10 with
The input connection of the second inductor L2, the output end of the second inductor L2 is connected with the automatic switch RF that recovers, the second inductor
The input and output end of L2 are grounded by the 11st capacitor C11, the 12nd capacitor C12 respectively；Tenth capacitor C10's
One end is connected with the 9th diode D9 positive poles, and the other end of the tenth capacitor C10 is connected with one end of the 8th resistor R8, and the 8th
The other end of resistor R8 is connected with the 9th diode D9 negative poles.
Further, the feedback circuit includes accurate voltage-stabiliser tube U1, linear optical coupling U2, the 9th resistor R9, the tenth
Resistor R10, the 13rd capacitor C13, wherein：One end of 9th resistor R9, one end of the tenth resistor R10 are simultaneously with the
The input connection of two inductor L2, the other end of the tenth resistor R10 is connected with the anode of linear optical coupling U2, the 9th resistor
One end of the 13rd capacitor C13, the reference pole connection of accurate voltage-stabiliser tube U1, the 13rd capacitor C13 simultaneously of the other end of R9
The other end be connected with the negative electrode of accurate voltage-stabiliser tube U1, the negative electrode of linear optical coupling U2 simultaneously, the anode of accurate voltage-stabiliser tube U1 with join
Examine and be connected between pole the 11st resistor R11, and the 11st resistor R11 is grounded；The colelctor electrode of linear optical coupling U2 is by the
12 resistor R12 are connected with the compensating end Comp of UC3842 chips, and the emitter stage of linear optical coupling U2 is anti-with UC3842 chips
Feedback end Vth connections, the 14th capacitor C14, UC3842 are connected between the compensating end Comp and feedback end Vth of UC3842 chips
The 13rd resistor R13 is connected between the compensating end Comp and reference voltage output end VREF of chip.
Preferably, the model TL431 of the accurate voltage-stabiliser tube U1, the model PC817 of linear optical coupling U2.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention is reasonable in design, easy to use, with UC3842 cores
Piece is core control part, wherein, EMI filter circuit carries out LPF, and constitutes anti-string mould with prime protection circuit, resists
Common mode disturbances circuit, for suppressing normal noise and common-mode noise interference, there is very strong attenuation to electromagnetic interference；Output filter
By the way of commutation diode parallel connection, component is few, simple structure and can effectively reduce peak voltage for wave circuit,
Reduce circuit loss.
Brief description of the drawings
Specific embodiments of the present invention are elaborated below in conjunction with the accompanying drawings.
Fig. 1 is system block diagram of the invention.
Fig. 2 is the pinouts of UC3842 chips in the present invention.
Fig. 3 is integrated circuit figure of the invention.
In figure：1- prime protection circuits, 2-EMI filter circuits, 3- bridge rectifiers, 4- inverse-excitation converting circuits, 5- is defeated
Go out filter circuit, 6- feedback circuits, 7- clamp circuits, 8- start-up circuits, 9- adjustment control modules, 91- protection circuits, 92- shakes
Swing circuit, 93- mu balanced circuits.
Specific embodiment
As shown in Figure 1 to Figure 3, a kind of switching mode power supply transformer, including prime protection circuit 1, the EMI filter being sequentially connected electrically
Wave circuit 2, bridge rectifier 3, inverse-excitation converting circuit 4 and output filter circuit 5, also including feedback circuit 6, clamp circuit
7th, start-up circuit 8, adjustment control module 9 and with adjustment control module 9 be connected protection circuit 91, oscillating circuit 92,
Mu balanced circuit 93, the adjustment control module 9 includes UC382 chips and its peripheral circuit.
Prime protection circuit 1 includes thermistor RT, piezo-resistance RV and the first capacitor C1, wherein：Piezo-resistance
The two ends of RV are connected with the zero line and zero line side of alternating current input power supplying Vi respectively, one end of thermistor RT with exchange input electricity
The zero line connection of source Vi, the other end is connected with one end of the first capacitor C1, the first capacitor C1 other ends with exchange input
The zero line side connection of power supply Vi；Thermistor RT selects model NTC10D-9, piezo-resistance RV to select model
MYG14K471。
EMI filter circuit 2 includes the first inductor L1, the second capacitor C2, the 3rd capacitor C3 and the 4th capacitor
Two ends of two inputs of C4, the first inductor L1 respectively with the first capacitor C1 are connected, the electricity of the 3rd capacitor C3 and the 4th
The second capacitor C2 is in parallel after container C4 series connection.
Bridge rectifier 3 is formed by connecting by four commutation diode D1~D4, with two ac input ends and two
DC output end；One ac input end of a bridge rectifier output end, the second electricity simultaneously with first sensor L1
One end of container C2, one end connection of the 3rd capacitor C3, another ac input end are simultaneously another with first sensor L1
Individual output end, the other end of the second capacitor C2, one end connection of the 4th capacitor C4；The positive DC of bridge rectifier is defeated
Go out end to be connected with inverse-excitation converting circuit 4, the earthing pole DC output end and the 3rd capacitor C3 of bridge rectifier and the 4th electric
The connection end connection of container C4, and by wired earth.
Clamp circuit 7 includes second resistance device R2, the 5th capacitor C5, the 5th diode D5；Start-up circuit 8 includes power
Switching tube S1,3rd resistor device R3, the 6th diode D6, inverse-excitation converting circuit 4 include transformer, the 7th diode D7, the 5th
Resistor R5, wherein：The transformer includes armature winding N1, feedback winding N2 and secondary windings N3；Bridge rectifier 3
Positive DC output end be connected with the power input VCC of UC3842 chips by first resistor device R1, bridge rectifier
Positive DC output end simultaneously with one end of second resistance device R2, one end of the 5th capacitor C5, one of armature winding N1
Input is connected, and the negative pole of the 5th diode D5 is while the other end of the other end, the 5th capacitor C5 with second resistance device R2
Connection, the positive pole of the 5th diode D5 is while the drain D of another input, power switch tube S 1 with armature winding N1 connects
Connect, the source S of power switch tube S 1 is by the 4th resistor R4 ground connection, the grid G of power switch tube S 1 and the 6th diode D6
Positive pole connection, the negative pole of the 6th diode D6 is connected with the output end OUT of UC3842 chips, and 3rd resistor device R3 is connected in parallel on the
The two ends of six diode D6；One input of feedback winding N2 is connected with the positive pole of the 7th diode D7, the 7th diode D7
Negative pole be connected with one end of the 5th resistor R5, the other end of the 5th resistor R5 and the power input of UC3842 chips
VCC is connected, another input end grounding of feedback winding N2.
Protection circuit 91 includes the 6th resistor R6 and the 6th capacitor C6, wherein：One end of 6th resistor R6 with
The source S connection of power switch tube S 1, the other end of the 6th resistor R6 one end, UC3842 cores simultaneously with the 6th capacitor C6
The current sense end Cs connections of piece, the other end ground connection of the 6th capacitor C6.
Oscillating circuit 92 includes the 7th resistor R7, the 7th capacitor C7, the 8th capacitor C8, wherein：7th resistor
One end of R7, one end of the 7th capacitor C7 are connected with the reference voltage output end VREF of UC3842 chips simultaneously, the 7th resistance
The other end of device R7 is connected with one end of the 8th capacitor C8, the timing end RT/CT of UC3842 chips, and the 7th capacitor C7's is another
One end, the other end of the 8th capacitor C8 are grounded simultaneously.
Mu balanced circuit 93 includes voltage-regulator diode D8, the 9th capacitor C9, wherein：The negative pole of voltage-regulator diode D8, the 9th
One end of capacitor C9 power input VCC simultaneously with UC3842 chips, the 5th resistor R5, first resistor device R1 are connected,
The positive pole of voltage-regulator diode D8, the other end of the 9th capacitor C9 are grounded simultaneously.
Output filter circuit 5 includes the 9th diode D9, the tenth diode D10, the 8th resistor R8, the tenth capacitor
C10, the second inductor L2 and automatic recovery switch RF, wherein：The positive pole of the 9th diode D9 and the tenth diode D10 with
One output end connection of secondary windings N3, the negative pole of the 9th diode D9 and the tenth diode D10 with the second inductor L2
Input connection, the output end of the second inductor L2 be connected with the automatic switch RF that recovers, the input of the second inductor L2 with
Output end is grounded by the 11st capacitor C11, the 12nd capacitor C12 respectively；One end and the 9th 2 of tenth capacitor C10
Pole pipe D9 positive poles are connected, and the other end of the tenth capacitor C10 is connected with one end of the 8th resistor R8, and the 8th resistor R8's is another
One end is connected with the 9th diode D9 negative poles.
Feedback circuit 6 includes accurate voltage-stabiliser tube U1, linear optical coupling U2, the 9th resistor R9, the tenth resistor R10, the tenth
Three capacitor C13, wherein：One end of 9th resistor R9, one end of the tenth resistor R10 are simultaneously defeated with the second inductor L2
Enter end connection, the other end of the tenth resistor R10 is connected with the anode of linear optical coupling U2, and the other end of the 9th resistor R9 is simultaneously
One end of 13rd capacitor C13, the reference pole connection of accurate voltage-stabiliser tube U1, the other end of the 13rd capacitor C13 simultaneously with
The negative electrode connection of the negative electrode of accurate voltage-stabiliser tube U1, linear optical coupling U2, the anode of accurate voltage-stabiliser tube U1 and is connected with reference between pole
11st resistor R11, and the 11st resistor R11 ground connection；The colelctor electrode of linear optical coupling U2 by the 12nd resistor R12 with
The compensating end Comp connections of UC3842 chips, the emitter stage of linear optical coupling U2 is connected with the feedback end Vth of UC3842 chips,
The 14th capacitor C14, the compensating end of UC3842 chips are connected between the compensating end Comp and feedback end Vth of UC3842 chips
The 13rd resistor R13 is connected between Comp and reference voltage output end VREF.
Work process of the invention is as follows：
Alternating current input power supplying Vi is by after prime protection circuit, LPF being carried out by EMI filter circuit, and EMI is filtered
Wave circuit and the anti-string mould of prime protection circuit composition, anti-common mode disturbances circuit, for suppressing normal noise and common-mode noise interference,
There is very strong attenuation to electromagnetic interference；Filtered alternating voltage by D1~D4 bridge rectifiers, and by being connected to bridge-type
Capacitor C15, C16 of two parallel connections of the positive DC output end of rectification circuit become the pulsation of 310V after being filtered again
DC voltage, this voltage charges by after first resistor device R1 step-downs to the 9th capacitor C9, when the voltage of the 9th capacitor C9
When reaching the startup voltage threshold value of UC3842 chips, UC3842 chips are started working and provide driving pulse, defeated by No. 6 pins
Go out to promote power switch tube S 1 to work.After the startup of UC3842 chips, the end-of-job of first resistor device R1, by feedback winding N2
Produce voltage to give UC3842 chip power supplies, the operating voltage of UC3842 chips has been exceeded due to input voltage, using the pole of voltage stabilizing two
Pipe D8 defines the input voltage of UC3842 chips, it is to avoid the impaired situation of UC3842 chips.
Unstable due to input voltage can cause circuit to occur short-circuit, over-pressed, under-voltage etc. being unfavorable for showing for circuit work
As occurring, therefore, circuit must have certain defencive function.If exporting terminal shortcircuit and producing excessively stream, power switch tube S 1
Drain current will significantly rise, the voltage at the 4th resistor R4 two ends rises, and (electric current is passed No. 3 pins of UC3842 chips
Sense end Cs) voltage also rise.When the voltage of No. 3 pins (current sense end Cs) reaches 1V more than normal value 0.3V,
The PWM comparators of UC3842 chip internals export high level by No. 2 pins (feedback end Vth), PWM latch is resetted, and close
Close output.At this moment, No. 6 pins (power output end OUT) of UC3842 chips without output, power switch tube S 1 is ended, so as to protect
Circuit is protected.If supply voltage occurs overvoltage, in more than 265V, UC3842 chips cannot adjust dutycycle, transformer
The voltage of armature winding N1 is greatly improved, and No. 7 supply voltages of pin (power input VCC) of UC3842 chips are also drastically gone up
Rise, the voltage of its No. 2 pins (feedback end Vth) also rises, close output.If the voltage of power network is less than 85V, UC3842 chips
The voltage of No. 1 pin (compensating end Comp) also decline, when below lV is declined, 2PWM comparators output high level locks PWM
Storage resets, and closes output.If artificially will unexpectedly export terminal shortcircuit, at this moment output current will be increased exponentially so that automatic
Recover the heat inside switch RF to increase sharply, its disconnecting circuit immediately plays overvoltage protection effect.Once failture evacuation, automatically certainly
It is dynamic to recover switch RF fast quick-recovery impedances within 5s.This circuit has short circuit overcurrent, overvoltage, under-voltage triple protection.
The precision voltage regulator U1 of feedback circuit selects model TL431, linear optical coupling U2 to select model PC817.Utilize
TL43l adjustable precises voltage-stablizer constitutes error voltage amplifier, then output is accurately adjusted by linear optical coupling PC817
It is whole.9th resistor R9, the 11st resistor R11 are the external control resistance of precision voltage regulator U1, and they determine output voltage
Height, and TL431 constitutes external error amplifier in the lump.When output voltage is raised, the voltage at the 5th resistor R5 two ends
Also increase；The reference voltage of precision voltage regulator TL431 is 2.5V, when No. 8 pins of the setting voltage more than UC3842 chips
Reference voltage when, the output voltage of the error amplifier in precision voltage regulator TL431 is raised, and causes the drive in UC3842 chips
The output voltage reduction of dynamic triode, until output voltage tends towards stability；Conversely, output voltage declines to cause setting under voltage
Drop, when output voltage is less than voltage is set, the output voltage of error amplifier declines, the output electricity of the driving triode in piece
Pressure is raised, and the final compensation input current for causing No. 1 pin of UC3842 chips changes therewith, promotes UC3842 chip internals
PWM comparators are adjusted, and change dutycycle, reach the purpose of voltage stabilizing.
Above-described embodiment is only the preferred embodiments of the present invention, not limiting the scope of the invention, as long as using
Design principle of the invention, and the change for carrying out non-creativeness work on this basis and making, all should belong to of the invention
Within protection domain.
Claims (7)
1. a kind of switching mode power supply transformer, including prime protection circuit (1), EMI filter circuit (2), the bridge-type being sequentially connected electrically
Rectification circuit (3), inverse-excitation converting circuit (4) and output filter circuit (5), it is characterised in that：Also include feedback circuit (6),
Clamp circuit (7), start-up circuit (8), adjustment control module (9) and the protection electricity being connected with adjustment control module (9)
Road (91), oscillating circuit (92), mu balanced circuit (93), the feedback circuit (6) are while output with output filter circuit (5)
End, adjustment control module (9) connection, adjustment control module (9) are connected with the input of inverse-excitation converting circuit (4)；The clamper
Circuit (7) while be connected with inverse-excitation converting circuit (4), start-up circuit (8), start-up circuit (8) at the same with adjustment control module
(9), protection circuit (91) connection, the mu balanced circuit (93) with inverse-excitation converting circuit (4) while be connected；The adjustment control mould
Block (9) includes UC382 chips and its peripheral circuit；The prime protection circuit (1) includes thermistor (RT), piezo-resistance
(RV) and the first capacitor (C1), wherein：The two ends of piezo-resistance (RV) respectively with the zero line of alternating current input power supplying (Vi)
With zero line side connection, one end of thermistor (RT) is connected with the zero line of alternating current input power supplying (Vi), the other end and first electric
One end connection of container (C1), the first capacitor (C1) other end is connected with the zero line side of alternating current input power supplying (Vi)；The EMI
Filter circuit (2) includes the first inductor (L1), the second capacitor (C2), the 3rd capacitor (C3) and the 4th capacitor
(C4), two ends of two inputs of the first inductor (L1) respectively with the first capacitor (C1) are connected, the 3rd capacitor (C3)
The second capacitor (C2) is in parallel after being connected with the 4th capacitor (C4)；The bridge rectifier (3) is by four commutation diodes
D1~D4 is formed by connecting, with two ac input ends and two DC output ends；One exchange of bridge rectifier (3) is defeated
Enter an output end, one end of second capacitor (C2), the one of threeth capacitor (C3) of the end simultaneously with first sensor (L1)
End connection, another ac input end simultaneously with another output end of first sensor (L1), the second capacitor (C2) it is another
One end, one end connection of the 4th capacitor (C4)；The positive DC output end of bridge rectifier is with inverse-excitation converting circuit (4) even
Connect, the connection end of the earthing pole DC output end of bridge rectifier and the 3rd capacitor (C3) and the 4th capacitor (C4) connects
Connect, and by wired earth.
2. a kind of switching mode power supply transformer according to claim 1, it is characterised in that：The clamp circuit (7) includes
Two resistors (R2), the 5th capacitor (C5), the 5th diode (D5)；Start-up circuit (8) includes power switch pipe (S1), the 3rd
Resistor (R3), the 6th diode (D6), inverse-excitation converting circuit (4) include transformer, the 7th diode (D7), the 5th resistor
(R5), wherein：The transformer includes armature winding (N1), feedback winding (N2) and secondary windings (N3)；Bridge rectifier electricity
The positive DC output end on road is connected by first resistor device (R1) with the power input (VCC) of UC3842 chips, and bridge-type is whole
The positive DC output end of current circuit one end simultaneously with second resistance device (R2), one end of the 5th capacitor (C5), it is primary around
One input connection of group (N1), the negative pole of the 5th diode (D5) other end, the 5th simultaneously with second resistance device (R2)
The other end connection of capacitor (C5), the positive pole of the 5th diode (D5) another input simultaneously with armature winding (N1),
The drain electrode connection of power switch pipe (S1), the source electrode of power switch pipe (S1) is grounded by the 4th resistor (R4), power switch
The grid for managing (S1) is connected with the positive pole of the 6th diode (D6), the negative pole of the 6th diode (D6) and the output of UC3842 chips
End (OUT) connection, 3rd resistor device (R3) is connected in parallel on the two ends of the 6th diode (D6)；One input of feedback winding (N2)
Positive pole with the 7th diode (D7) is connected, and the negative pole of the 7th diode (D7) is connected with one end of the 5th resistor (R5), the
The other end of five resistors (R5) is connected with the power input (VCC) of UC3842 chips, and another of feedback winding (N2) is defeated
Enter end ground connection.
3. a kind of switching mode power supply transformer according to claim 2, it is characterised in that：The protection circuit (91) includes
Six resistors (R6) and the 6th capacitor (C6), wherein：One end of 6th resistor (R6) and the source of power switch pipe (S1)
Pole connects, and the other end of the 6th resistor (R6) is while the current sense of the one end, UC3842 chips with the 6th capacitor (C6)
End (Cs) connection, the other end ground connection of the 6th capacitor (C6).
4. a kind of switching mode power supply transformer according to claim 3, it is characterised in that：The oscillating circuit (92) includes
Seven resistors (R7), the 7th capacitor (C7), the 8th capacitor (C8), wherein：One end, the 7th electric capacity of the 7th resistor (R7)
One end of device (C7) is connected with the reference voltage output end (VREF) of UC3842 chips simultaneously, the other end of the 7th resistor (R7)
The timing end (RT/CT) of one end, UC3842 chips with the 8th capacitor (C8) is connected, the other end of the 7th capacitor (C7),
The other end of the 8th capacitor (C8) is grounded simultaneously.
5. a kind of switching mode power supply transformer according to claim 4, it is characterised in that：The mu balanced circuit (93) is including steady
Pressure diode (D8), the 9th capacitor (C9), wherein：The negative pole of voltage-regulator diode (D8), the 9th capacitor (C9) one end it is same
When be connected with the power input (VCC) of UC3842 chips, the 5th resistor (R5), first resistor device (R1), voltage-regulator diode
(D8) positive pole, the other end of the 9th capacitor (C9) are grounded simultaneously.
6. a kind of switching mode power supply transformer according to claim 5, it is characterised in that：Output filter circuit (5) bag
Include the 9th diode (D9), the tenth diode (D10), the 8th resistor (R8), the tenth capacitor (C10), the second inductor
(L2) switch (RF) and is automatically recovered, wherein：The positive pole of the 9th diode (D9) and the tenth diode (D10) with secondary around
One output end connection of group (N3), the negative pole of the 9th diode (D9) and the tenth diode (D10) with the second inductor
(L2) input connection, the output end of the second inductor (L2) is connected with the automatic switch (RF) that recovers, the second inductor (L2)
Input and output end respectively by the 11st capacitor (C11), the 12nd capacitor (C12) be grounded；Tenth capacitor
(C10) one end is connected with the 9th diode (D9) positive pole, the other end of the tenth capacitor (C10) and the 8th resistor (R8)
One end connects, and the other end of the 8th resistor (R8) is connected with the negative pole of the 9th diode (D9).
7. a kind of switching mode power supply transformer according to claim 6, it is characterised in that：The feedback circuit (6) is including essence
Close voltage-stabiliser tube (U1), linear optical coupling (U2), the 9th resistor (R9), the tenth resistor (R10), the 13rd capacitor (C13), its
In：One end of 9th resistor (R9), one end of the tenth resistor (R10) connect with the input of the second inductor (L2) simultaneously
Connect, the other end of the tenth resistor (R10) is connected with the anode of linear optical coupling (U2), the other end of the 9th resistor (R9) is simultaneously
One end of 13rd capacitor (C13), the reference pole connection of accurate voltage-stabiliser tube (U1), the other end of the 13rd capacitor (C13)
It is connected with the negative electrode of accurate voltage-stabiliser tube (U1), the negative electrode of linear optical coupling (U2) simultaneously, anode and the reference of accurate voltage-stabiliser tube (U1)
The 11st resistor (R11) is connected between pole, and the 11st resistor (R11) is grounded；The colelctor electrode of linear optical coupling (U2) leads to
The 12nd resistor (R12) is crossed to be connected with the compensating end (Comp) of UC3842 chips, the emitter stage of linear optical coupling (U2) with
Feedback end (Vth) connection of UC3842 chips, is connected with the between the compensating end (Comp) and feedback end (Vth) of UC3842 chips
14 capacitors (C14), the tenth is connected between the compensating end (Comp) and reference voltage output end (VREF) of UC3842 chips
Three resistors (R13).
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| CN201710144766.0A CN106921303B (en) | 2017-03-13 | 2017-03-13 | Switching power supply transformer |
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| CN201710144766.0A CN106921303B (en) | 2017-03-13 | 2017-03-13 | Switching power supply transformer |
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| CN108322067A (en) * | 2017-12-29 | 2018-07-24 | 河南北瑞电子科技有限公司 | A kind of Switching Power Supply |
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