CN108365765A - A kind of multiple-channel output single-end flyback switching power supply - Google Patents
A kind of multiple-channel output single-end flyback switching power supply Download PDFInfo
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- CN108365765A CN108365765A CN201810294233.5A CN201810294233A CN108365765A CN 108365765 A CN108365765 A CN 108365765A CN 201810294233 A CN201810294233 A CN 201810294233A CN 108365765 A CN108365765 A CN 108365765A
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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
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static 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
- H02M1/14—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
- H02M3/22—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
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of multiple-channel output single-end flyback switching power supplies, and the output direct current for the alternating current of input to be changed into predetermined voltage simultaneously exports, including：Input rectifying filter circuit, the convert alternating current for that will input are exported at direct current by the ports+V0；DC DC translation circuits, for reducing the voltage of the direct current to form low DC voltage, include for by DC voltage inversion be high frequency transformer effect alternating voltage inverter circuit and for the ripple of output voltage to be become more smooth output rectifier and filter；UC3844 control circuits, the inductive current of voltage and high frequency transformer for exporting rectification sample to generate the pwm signal of distinct pulse widths；And feedback circuit is input to UC3844 control circuits to control duty ratio, to stabilize the output voltage for obtaining error voltage from the voltage sample of output after error is amplified.
Description
Technical field
The present invention relates to a kind of Switching Power Supplies, and in particular to a kind of multiple-channel output single-end flyback switching power supply.
Background technology
Power electronic equipment and people’s lives, work are closely related, and these equipment are required for reliable power supply power supply.
Traditional linear power supply is operated in magnifying state, and the volume of working frequency 50HZ, house transformer are big, therefore linear power supply
Volume is big, and weight is big, big for consuming, and calorific value is high, and efficiency is low, carries difficult.And Switching Power Supply is operated in saturation state and cut-off
State, i.e. on off state, working frequency 50KHZ, house transformer it is small.So Switching Power Supply it is light-weight, it is small,
Calorific value is low, efficient, performance is stable, easy to use, in the multiple fields such as communication, space flight, instrument, equipment, machinery, electric appliance
It is widely used.
Invention content
The present invention is to carry out to solve the above-mentioned problems, and it is an object of the present invention to provide a kind of multiple-channel output single-ended flyback is opened
Powered-down source.
The present invention provides a kind of multiple-channel output single-end flyback switching power supplies, pre- for the alternating current of input to be changed into
The output direct current of constant voltage is simultaneously exported, and is had the feature that, including：Input rectifying filter circuit, for that will input
Convert alternating current at direct current pass through the ports+V0 export；DC-DC conversion circuit, for reducing direct current voltage to shape
Include for the inverter circuit and use by DC voltage inversion for the alternating voltage of high frequency transformer effect at low DC voltage
In the ripple of output voltage is become more smooth output rectifier and filter；UC3844 control circuits, for generating difference
The pwm signal of pulsewidth controls switch mosfet pipe entirely to drive；And feedback circuit, for obtaining error from the voltage sample of output
Voltage is input to UC3844 control circuits to control duty ratio, to stabilize the output voltage, wherein inverse after error is amplified
Become circuit include the capacitance C6 for being connected to the ports+V0, the resistance R1 being connect with capacitance C6, the capacitance C7 being connect with resistance R1, and
The resistance R2 of capacitance C7 connections and the diode D8 and high frequency transformer being connect with resistance R2, UC3844 control circuits include
UC3844 controls chip and voltage-stabiliser tube D11, the resistance R7 and capacitance C11 and control chip being connect with control the first pin of chip
The R15 of second pin connection, the capacitance C10 being connect with control chip third pin and resistance R4, two poles being connect with resistance R4
Pipe D10, the capacitance C9 being connect with diode D10 and resistance R3 are connected between control the 4th pin of chip and the 8th pin
The resistance R6 that is connect with control the 6th pin of chip, resistance R14, the capacitance C19 being connect with the 4th pin are connect with resistance R6
Full control switch mosfet pipe S, the resistance R5 being connect with full control switch mosfet pipe S, the electricity being connect with control the 8th pin of chip
The polar capacitor C8 and diode D9 for holding C12 and being connect with voltage-stabiliser tube D11.
In multiple-channel output single-end flyback switching power supply provided by the invention, it can also have the feature that：Wherein,
Input rectifying filter circuit includes：Fuse FU, varistor VSR, thermistor NTCR, capacitance C1, inductance, capacitance C2, electricity
The one end for holding C3, capacitance C4, diode D1, diode D2, diode D3, diode D4 and polar capacitor C5, fuse FU connects
The ports AC1 are connected to, the other end is connected to one end of varistor VSR, and the other end of varistor VSR is connect with the ports AC2；
The one end thermistor NTCR is connect with fuse FU, and the other end is connected to one end of capacitance C1；The other end of capacitance C1 is connected to
On the ports AC2；Capacitance C1 connections are parallel to one end of inductance, and the other end of inductance is parallel with capacitance C2, one end of capacitance C2
It is connect with one end of capacitance C3, the other end of capacitance C2 is connect with one end of capacitance C4, and the other end of capacitance C3 is with capacitance C4's
The other end is grounded；The anode and inductance connection of diode D1, also connect with the cathode of diode D2, and the cathode of diode D1 connects
It is connected to the ports+V0, the plus earth of diode D2；The anode of diode D3 and the cathode of diode D4 with inductance connection,
After the anode of the cathode of diode D3 and diode D4 is in parallel with polar capacitor C5, then respectively be connected to the ports+V0 and ground connection.
In multiple-channel output single-end flyback switching power supply provided by the invention, it can also have the feature that：Wherein,
Output rectifier and filter includes：Diode D5, diode D6, diode D7, capacitance C13, capacitance C14, capacitance C15, capacitance
The cathode of C16, capacitance C17, capacitance C18, inductance L2, inductance L3 and inductance L4, diode D5 are connect with inductance L2, inductance L2's
Both ends are connected separately with capacitance C13 and capacitance C14；The cathode of diode D6 is connect with inductance L3, and the both ends of inductance L3 connect respectively
It is connected to capacitance C15 and capacitance C16；The cathode of diode D7 is connect with inductance L4, and the both ends of inductance L4 are connected separately with capacitance C17
With capacitance C18.
In multiple-channel output single-end flyback switching power supply provided by the invention, it can also have the feature that：Wherein,
Feedback circuit includes：Resistance R16, linear optocoupler PC817, resistance R8, resistance R9, adjustable precision shunt regulator TL431,
Resistance R11, resistance R10, resistance R12 and resistance R13, the one end resistance R16 are connect with one end of resistance R15, and resistance R16's is another
End ground connection；The 8th pin that one end of linear optocoupler PC817 triodes side and UC3844 control chip connect, the other end and
Resistance R16 and resistance R15 are all connected with, and positive one end of linear optocoupler PC817 diode sides is connect with one end of resistance R8,
Cathode one end is connect with one end of resistance R9, the one end of the other end of resistance R8 and the other end of resistance R9 with resistance R11
Connection, the other end of resistance R11 are connect with one end of resistance R10, the other end ground connection of resistance R10；Adjustable precision is in parallel
Voltage-stablizer TL431 and resistance R11, resistance R12 and resistance R13 are all connected with, and adjustable precision shunt regulator TL431 ground connection.
In multiple-channel output single-end flyback switching power supply provided by the invention, it can also have the feature that：Wherein,
Feedback circuit output has the output of three tunnels, respectively three road isolation voltages of output+3.3V/0.5A ,+5V/0.5A and+12V/1A.
In multiple-channel output single-end flyback switching power supply provided by the invention, it can also have the feature that：Wherein,
Full control switch mosfet pipe S is also connect with the cathode of diode D8.
The effect of invention
Full control in the UC3844 control circuits of multiple-channel output single-end flyback switching power supply according to the present invention
Switch mosfet pipe S is operated on off state, and impedance is small when it is connected, and close to short circuit, tube voltage drop is close to zero；It is hindered when shutdown
Anti- very big, close to open circuit, electric current is almost nil.Full control switch mosfet pipe S, which is either connected, to be also off, its power consumption is very
It is small, so the efficiency of Switching Power Supply can be significantly increased.In addition, can equipped with voltage-stablizer D11 in UC3844 control circuits
Prevent voltage damage UC3844 control chips.A kind of DC-DC electricity of the multiple-channel output single-end flyback switching power supply of the present embodiment
Road uses high frequency transformer, and the dissipated power on control switch mosfet pipe S is greatly lowered entirely, eliminates larger heat dissipation
Piece.So Switching Power Supply is small, it is light-weight.A kind of feedback of the multiple-channel output single-end flyback switching power supply of the present embodiment
The linear optocoupler PC817 being equipped in circuit can make to control the drive signal that switch mosfet pipe S obtains the output of the 6th pin entirely
Duty ratio reduce, to output voltage decline achieve the purpose that voltage stabilizing.Therefore, a kind of multiple-channel output of the present embodiment is single-ended anti-
Excitation type switch power-supply has many advantages, such as that light-weight, small, calorific value is low, efficient, performance is stable, easy to use.
Description of the drawings
Fig. 1 is the electrical block diagram of the multiple-channel output single-end flyback switching power supply in the embodiment of the present invention.
Specific implementation mode
In order to which the technological means for making the present invention realize is easy to understand with effect, with reference to embodiments and attached drawing is to this
Invention is specifically addressed.
Embodiment：
Fig. 1 is the multiple-channel output single-end flyback switching power supply structural schematic diagram in the embodiment of the present invention, wherein Fig. 1
(a) be input rectifying filter circuit in the embodiment of the present invention electrical block diagram；Fig. 1 (b) is the implementation of the present invention
The electrical block diagram of DC-DC conversion circuit, UC3844 control circuits and feedback circuit in example, and the ends+V0 in Fig. 1 (a)
Mouth is the same port with the ports+V0 in Fig. 1 (b).
As shown in Figure 1, a kind of multiple-channel output single-end flyback switching power supply of the present embodiment, the alternating current for that will input
It is changed into the output direct current of predetermined voltage and is exported, including：Input rectifying filter circuit 1, DC-DC conversion circuit 2,
UC3844 control circuits 3 and feedback circuit 4.
Input rectifying filter circuit 1, the convert alternating current for that will input are exported at direct current by the ports+V0.
Input rectifying filter circuit 1 includes：Fuse FU, varistor VSR, thermistor NTCR, capacitance C1, inductance,
Capacitance C2, capacitance C3, capacitance C4, diode D1, diode D2, diode D3, diode D4 and polar capacitor C5.
One end of fuse FU is connected to the ports AC1, and the other end is connected to one end of varistor VSR, the varistor
The other end of VSR is connect with the ports AC2.
The one end thermistor NTCR is connect with fuse FU, and the other end is connected on one end of the capacitance C1.
The other end of capacitance C1 is connected on the ports AC2.
Capacitance C1 connections are parallel to one end of inductance, and the other end of inductance is parallel with capacitance C2, one end of capacitance C2 with
One end of capacitance C3 connects, and the other end of capacitance C2 is connect with one end of capacitance C4, and the other end of capacitance C3 is another with capacitance C4's
One end is grounded.
The anode and inductance connection of diode D1, also connect with the cathode of diode D2, and the cathode of diode D1 is connected to+
The ports V0, the plus earth of diode D2.
The anode of diode D3 and the cathode of diode D4 with inductance connection, cathode and the diode D4 of diode D3
Anode it is in parallel with polar capacitor C5 after, then respectively be connected to the ports+V0 and ground connection.
DC-DC conversion circuit 2, for reducing the voltage of direct current to form low DC voltage, including inverter circuit
With for the ripple of output voltage to be become more smooth output rectifier and filter 21.
Output rectifier and filter 21 includes：Diode D5, diode D6, diode D7, capacitance C13, capacitance C14, electricity
Hold C15, capacitance C16, capacitance C17, capacitance C18, inductance L2, inductance L3 and inductance L4.
The cathode of diode D5 is connect with inductance L2, and the both ends of inductance L2 are connected separately with capacitance C13 and capacitance C14.
The cathode of diode D6 is connect with inductance L3, and the both ends of inductance L3 are connected separately with capacitance C15 and capacitance C16.
The cathode of diode D7 is connect with inductance L4, and the both ends of inductance L4 are connected separately with capacitance C17 and capacitance C18.
For including being connected to the ends+V0 by the inverter circuit for the alternating voltage that DC voltage inversion is high frequency transformer effect
Mouthful capacitance C6, the resistance R1 being connect with capacitance C6, the capacitance C7 being connect with resistance R1, the resistance R2 that is connect with capacitance C7 and with
The diode D8 and high frequency transformer of resistance R2 connections.
UC3844 control circuits 3, the inductive current of voltage and high frequency transformer for exporting rectification sample from
And generate the pwm signal of distinct pulse widths.
UC3844 control circuits 3 include UC3844 control chips and voltage-stabiliser tube D11, are connect with control the first pin of chip
Resistance R7 and capacitance C11, R15 connect with control the second pin of chip, with control the capacitance C10 that connect of chip third pin and
Resistance R4, the diode D10 being connect with resistance R4, the capacitance C9 being connect with diode D10 and resistance R3, are connected to control chip
Resistance R14 between 4th pin and the 8th pin, the capacitance C19 being connect with the 4th pin connect with control the 6th pin of chip
The resistance R6 that connects, the full control switch mosfet pipe S being connect with resistance R6, with the full control switch mosfet pipe S resistance R5 connecting and
The capacitance C12 of control the 8th pin of the chip connection and polar capacitor C8 and diode D9 being connect with voltage-stabiliser tube D11.
Full control switch mosfet pipe S is also connect with the cathode of diode D8.
Full control switch mosfet pipe S drives work by pwm signal.
Feedback circuit 4 is input to UC3844 for obtaining error voltage from the voltage sample of output after error is amplified
Control circuit controls duty ratio, to stabilizing the output voltage.
Feedback circuit 4 includes：Resistance R16, linear optocoupler PC817, resistance R8, resistance R9, adjustable precision are in parallel steady
Depressor TL431, resistance R11, resistance R10, resistance R12 and resistance R13.
The one end resistance R16 is connect with one end of resistance R15, the other end ground connection of resistance R16.
The 8th pin that one end of linear optocoupler PC817 triodes side controls chip with UC3844 is connect, the other end
It is all connected with resistance R16 and resistance R15, positive one end of linear optocoupler PC817 diode sides connects with one end of resistance R8
Connect, cathode one end is connect with one end of resistance R9, the other end of resistance R8 and the other end of resistance R9 with resistance R11 one
End connection, the other end of resistance R11 are connect with one end of resistance R10, the other end ground connection of resistance R10.
Adjustable precision shunt regulator TL431 and resistance R11, resistance R12 and resistance R13 are all connected with, and adjustable precision
Shunt regulator TL431 ground connection.
Feedback circuit 4 output have three tunnels output, respectively three tunnels output+3.3V/0.5A ,+5V/0.5A and+12V/1A every
Ionization voltage.
The course of work of the multiple-channel output single-end flyback switching power supply of the present embodiment is as follows：
The multiple-channel output single-end flyback switching power supply of the present embodiment includes the startup of Switching Power Supply, the storage of Switching Power Supply
The voltage stabilizing for releasing energy and Switching Power Supply of energy, Switching Power Supply.
The startup of Switching Power Supply：The 300V DC voltages that 220V alternating currents are obtained by input rectifying filter circuit are divided into two
Road：The armature winding Np for passing through high frequency transformer all the way is added in the drain electrode of full control switch mosfet pipe；Passing through all the way in addition is opened
Dynamic resistance R1 charges to C8, provides startup voltage for full control switch mosfet pipe, is added in the 7th pin of UC3844 control chips,
When C8 charge values reach 16V, UC3844 controls chip and starts work, this process is known as the soft start of voltage.In order to prevent
Surge voltage damages UC3844 and controls chip, and between its 7th pin and ground plus a 18V voltage-stabiliser tube D11, the 8th pin produce
Raw reference voltage 5V charges to C19 by R14, and sawtooth voltage signal, its frequency are formed on the 4th pin
It is exactly the working frequency of power supply, sawtooth voltage signal enters the internal oscillator of UC3844 control chips, it is solid to produce frequency
Fixed oscillator signal, after pulse width modulation and the amplification of Push-pull-output stage, in the 6th pin output gate driving letter
Number make to control the S conductings of switch mosfet pipe entirely；
The energy storage of Switching Power Supply：High frequency voltage pulse is by the first of high frequency transformer after full control switch mosfet pipe S conductings
Grade winding, the full source drain for controlling switch mosfet pipe S, current sense resistor R5 and earth-current circuit, are produced on armature winding
Just lower negative induced electromotive force in life knows that the electromotive force of transformer secondary output winding induction is negative, two pole of output rectification by Same Name of Ends
Reverse-biased cut-off is managed, electric energy is stored in the form of magnetic energy in primary winding coil by high frequency transformer, and here it is thermal energy storage processes；
Switching Power Supply releases energy：When control switch mosfet pipe S latch overturning entirely, the output pulse of the 6th pin stops
Only, control switch mosfet pipe S becomes to end by being connected entirely.Primary winding just upper negative induced electromotive force under generating, it is secondary
Grade winding generates positive induced voltage, and output rectifier diode is just connected, and armature winding is by the energy transmission of storage to secondary
In winding, the output voltage that is just needed using current rectifying and wave filtering circuit；
The voltage stabilizing of Switching Power Supply：Three tunnel+3.3V ,+5V ,+12V output voltages are after R11, R12, R13 partial pressure and adjustable
The reference voltage 2.5V of precision shunt voltage-stablizer TL431 compares, and generates error voltage, and by linear optocoupler PC817
Error voltage is transmitted to UC3844 and controls chip, it controls the duty ratio of full control switch mosfet pipe S to carry out voltage stabilizing.Output electricity
When pressure increases, is also increased by the sampled voltage obtained by divider resistance, flow through the electricity of linear optocoupler PC817 light emitting diodes
Stream increases, and the conducting degree of phototriode is deepened, its collection emitter voltage reduces, complete the 6th pipe for controlling switch mosfet pipe S
The duty ratio of the drive signal of foot output reduces, therefore output voltage declines, and has achieved the purpose that voltage stabilizing.Output voltage declines
When, control process is contrary to the above.
The effect of embodiment
A kind of full control in the UC3844 control circuits of the multiple-channel output single-end flyback switching power supply of the present embodiment
Switch mosfet pipe S is operated on off state, and impedance is small when it is connected, and close to short circuit, tube voltage drop is close to zero；It is hindered when shutdown
Anti- very big, close to open circuit, electric current is almost nil.Full control switch mosfet pipe S, which is either connected, to be also off, its power consumption is very
It is small, so the efficiency of Switching Power Supply can be significantly increased.In addition, can equipped with voltage-stablizer D11 in UC3844 control circuits
Prevent voltage damage UC3844 control chips.A kind of DC-DC electricity of the multiple-channel output single-end flyback switching power supply of the present embodiment
Road uses high frequency transformer, and the dissipated power on control switch mosfet pipe S is greatly lowered entirely, eliminates larger heat dissipation
Piece.So Switching Power Supply is small, it is light-weight.A kind of feedback of the multiple-channel output single-end flyback switching power supply of the present embodiment
The linear optocoupler PC817 being equipped in circuit can make to control the drive signal that switch mosfet pipe S obtains the output of the 6th pin entirely
Duty ratio reduce, to output voltage decline achieve the purpose that voltage stabilizing.Therefore, a kind of multiple-channel output of the present embodiment is single-ended anti-
Excitation type switch power-supply has many advantages, such as that light-weight, small, calorific value is low, efficient, performance is stable, easy to use.
The above embodiment is the preferred case of the present invention, is not intended to limit protection scope of the present invention.
Claims (6)
1. a kind of multiple-channel output single-end flyback switching power supply, the output for the alternating current of input to be changed into predetermined voltage are straight
Galvanic electricity is simultaneously exported, which is characterized in that including：
Input rectifying filter circuit, the convert alternating current for that will input are exported at direct current by the ports+V0；
DC-DC conversion circuit for reducing the voltage of the direct current to form low DC voltage, including is used for direct current
Voltage inversion is for the inverter circuit of the alternating voltage of high frequency transformer effect and for becoming more to put down the ripple of output voltage
Sliding output rectifier and filter；
UC3844 control circuits, the inductive current of voltage and high frequency transformer for exporting rectification sample to generate
The pwm signal of distinct pulse widths；And
Feedback circuit is input to the UC3844 for obtaining error voltage from the voltage sample of output after error is amplified
Control circuit controls duty ratio, to stabilizing the output voltage,
Wherein, the inverter circuit include the capacitance C6 for being connected to the ports+V0, the resistance R1 being connect with the capacitance C6,
The capacitance C7 that is connect with the resistance R1, with the diode D8 capacitance C7 resistance R2 connecting and connect with the resistance R2
And high frequency transformer,
The UC3844 control circuits include UC3844 control chips and voltage-stabiliser tube D11, are connect with control the first pin of chip
Resistance R7 and capacitance C11, R15 connect with control the second pin of chip, with control the capacitance C10 that connect of chip third pin and
Resistance R4, the diode D10 being connect with the resistance R4, with the diode D10 capacitance C9 connecting and resistance R3, be connected to
Resistance R14, the capacitance C19 being connect with the 4th pin between the 4th pin of chip and the 8th pin are controlled, with control core
The resistance R6 of the 6th pin of piece connection, the full control switch mosfet pipe S being connect with the resistance R6 and the full control
The resistance R5 of switch mosfet pipe S connections, with the capacitance C12 that connect of control the 8th pin of chip and with the voltage-stabiliser tube
The polar capacitor C8 and diode D9 of D11 connections.
2. multiple-channel output single-end flyback switching power supply according to claim 1, it is characterised in that：
Wherein, the input rectifying filter circuit includes：Fuse FU, varistor VSR, thermistor NTCR, capacitance C1, electricity
Sense, capacitance C2, capacitance C3, capacitance C4, diode D1, diode D2, diode D3, diode D4 and polar capacitor C5,
One end of the fuse FU is connected to the ports AC1, and the other end is connected to one end of the varistor VSR, this is pressure-sensitive
The other end of resistance VSR is connect with the ports AC2；
The one end the thermistor NTCR is connect with the fuse FU, and the other end is connected to one end of the capacitance C1；
The other end of the capacitance C1 is connected on the ports AC2；
The capacitance C1 connections are parallel to one end of the inductance, and the other end of the inductance is parallel with the capacitance C2, the electricity
The one end for holding C2 is connect with one end of the capacitance C3, and the other end of the capacitance C2 is connect with one end of the capacitance C4, institute
The other end for stating the other end and the capacitance C4 of capacitance C3 is grounded；
Anode and the inductance connection of the diode D1, also connect with the cathode of the diode D2, the diode D1
Cathode be connected to the ports+V0, the plus earth of the diode D2；
The anode of the diode D3 and the cathode of the diode D4 with the inductance connection, the cathode of the diode D3
After in parallel with the polar capacitor C5 with the anode of the diode D4, then respectively be connected to described in the ports+V0 and ground connection.
3. multiple-channel output single-end flyback switching power supply according to claim 1, it is characterised in that：
Wherein, the output rectifier and filter includes：Diode D5, diode D6, diode D7, capacitance C13, capacitance C14,
Capacitance C15, capacitance C16, capacitance C17, capacitance C18, inductance L2, inductance L3 and inductance L4,
The cathode of the diode D5 is connect with the inductance L2, and the both ends of the inductance L2 are connected separately with the capacitance C13
With the capacitance C14；
The cathode of the diode D6 is connect with the inductance L3, and the both ends of the inductance L3 are connected separately with the capacitance C15
With the capacitance C16；
The cathode of the diode D7 is connect with the inductance L4, and the both ends of the inductance L4 are connected separately with the capacitance C17
With the capacitance C18.
4. multiple-channel output single-end flyback switching power supply according to claim 1, it is characterised in that：
Wherein, the feedback circuit includes：Resistance R16, linear optocoupler PC817, resistance R8, resistance R9, adjustable precision are simultaneously
Join voltage-stablizer TL431, resistance R11, resistance R10, resistance R12 and resistance R13,
The one end the resistance R16 is connect with one end of the resistance R15, the other end ground connection of the resistance R16；
The 8th pin that one end of the linear optocoupler PC817 triodes side controls chip with the UC3844 is connect, separately
One end is all connected with the resistance R16 and the resistance R15, positive one end of the linear optocoupler PC817 diode sides
Connect with one end of the resistance R8, cathode one end is connect with one end of the resistance R9, the other end of the resistance R8 and
The other end of the resistance R9 is connect with one end of the resistance R11, and the other end of resistance R11 is with the resistance R10's
One end connects, the other end ground connection of resistance R10；
The adjustable precision shunt regulator TL431 and resistance R11, the resistance R12 and the resistance R13 connect
It connects, and the adjustable precision shunt regulator TL431 is grounded.
5. multiple-channel output single-end flyback switching power supply according to claim 1, it is characterised in that：
Wherein, the feedback circuit output has the output of three tunnels, respectively output+3.3V/0.5A ,+5V/0.5A and+12V/1A three
Road isolation voltage.
6. multiple-channel output single-end flyback switching power supply according to claim 1, it is characterised in that：
Wherein, the full control switch mosfet pipe S is also connect with the cathode of the diode D8.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768179A (en) * | 2018-07-20 | 2018-11-06 | 珠海格力电器股份有限公司 | Switching power supply circuit, drive plate and variable frequency air conditioner |
| CN109510468A (en) * | 2018-12-19 | 2019-03-22 | 奥克斯空调股份有限公司 | A kind of switching power circuit and air conditioner |
| CN111464054A (en) * | 2020-03-31 | 2020-07-28 | 鲁西工业装备有限公司 | Direct current switch power supply |
| CN112366945A (en) * | 2020-10-26 | 2021-02-12 | 深圳市必易微电子股份有限公司 | Isolated multi-output power supply circuit and control circuit and dynamic response method thereof |
| CN112600425A (en) * | 2020-12-02 | 2021-04-02 | 南京民联仪器制造有限公司 | Low-current controllable rectifier working in ultralow-frequency dielectric loss measuring device and rectification control method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06351250A (en) * | 1993-04-16 | 1994-12-22 | Toshiba Corp | Power supply |
| JP2002369538A (en) * | 2001-06-01 | 2002-12-20 | Sanken Electric Co Ltd | Switching power supply |
| CN203827205U (en) * | 2013-08-30 | 2014-09-10 | 昂宝电子（上海）有限公司 | Flyback switching power circuit |
| CN204156745U (en) * | 2014-08-19 | 2015-02-11 | 千江（上海）信息科技有限公司 | Inverse-excitation type multi-output switch power source |
| CN204316352U (en) * | 2014-12-22 | 2015-05-06 | 施耐德万高（天津）电气设备有限公司 | The Switching Power Supply that a kind of new type multipath exports |
| CN205490211U (en) * | 2016-04-01 | 2016-08-17 | 河海大学 | Miniwatt switching power supply circuit of multiplexed output |
| CN106877700A (en) * | 2015-12-14 | 2017-06-20 | 邢筱丹 | A kind of novel switched voltage-stabilized power supply based on UC3842 |
| CN107276436A (en) * | 2017-08-08 | 2017-10-20 | 广西南宁驰信电子科技有限公司 | A kind of single-end flyback switching power supply circuit |
-
2018
- 2018-03-30 CN CN201810294233.5A patent/CN108365765A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06351250A (en) * | 1993-04-16 | 1994-12-22 | Toshiba Corp | Power supply |
| JP2002369538A (en) * | 2001-06-01 | 2002-12-20 | Sanken Electric Co Ltd | Switching power supply |
| CN203827205U (en) * | 2013-08-30 | 2014-09-10 | 昂宝电子（上海）有限公司 | Flyback switching power circuit |
| CN204156745U (en) * | 2014-08-19 | 2015-02-11 | 千江（上海）信息科技有限公司 | Inverse-excitation type multi-output switch power source |
| CN204316352U (en) * | 2014-12-22 | 2015-05-06 | 施耐德万高（天津）电气设备有限公司 | The Switching Power Supply that a kind of new type multipath exports |
| CN106877700A (en) * | 2015-12-14 | 2017-06-20 | 邢筱丹 | A kind of novel switched voltage-stabilized power supply based on UC3842 |
| CN205490211U (en) * | 2016-04-01 | 2016-08-17 | 河海大学 | Miniwatt switching power supply circuit of multiplexed output |
| CN107276436A (en) * | 2017-08-08 | 2017-10-20 | 广西南宁驰信电子科技有限公司 | A kind of single-end flyback switching power supply circuit |
Non-Patent Citations (1)
| Title |
|---|
| 尹雷，万舟，沈天舒: ""新型多路输出单端反激式开关电源设计"", 《软件》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768179A (en) * | 2018-07-20 | 2018-11-06 | 珠海格力电器股份有限公司 | Switching power supply circuit, drive plate and variable frequency air conditioner |
| CN109510468A (en) * | 2018-12-19 | 2019-03-22 | 奥克斯空调股份有限公司 | A kind of switching power circuit and air conditioner |
| CN109510468B (en) * | 2018-12-19 | 2024-03-15 | 奥克斯空调股份有限公司 | Switching power supply circuit and air conditioner |
| CN111464054A (en) * | 2020-03-31 | 2020-07-28 | 鲁西工业装备有限公司 | Direct current switch power supply |
| CN112366945A (en) * | 2020-10-26 | 2021-02-12 | 深圳市必易微电子股份有限公司 | Isolated multi-output power supply circuit and control circuit and dynamic response method thereof |
| CN112600425A (en) * | 2020-12-02 | 2021-04-02 | 南京民联仪器制造有限公司 | Low-current controllable rectifier working in ultralow-frequency dielectric loss measuring device and rectification control method thereof |
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