CN206149143U - Double -barrelled just sharp switching power supply circuit - Google Patents
Double -barrelled just sharp switching power supply circuit Download PDFInfo
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- CN206149143U CN206149143U CN201621050558.1U CN201621050558U CN206149143U CN 206149143 U CN206149143 U CN 206149143U CN 201621050558 U CN201621050558 U CN 201621050558U CN 206149143 U CN206149143 U CN 206149143U
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- power supply
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Abstract
The utility model provides a double -barrelled just sharp switching power supply circuit, includes that the double -barrelled just sharp network on the former limit of transformer doubly flows rectifier circuit and feedback loop with vice limit. In the transfer circuit is just swashed in former limit, supply power for control chip through interpolation auxiliary winding and reduce the loss. Use on vice limit and doubly flow rectifier circuit for inductive current reduces half thely, makes this circuit be fit for the situation of heavy current, has avoided the pulse spike that two diode circuit on the vice limit caused. In feedback loop, through using soft start circuit, reduce the power start -up and feed back the error in the twinkling of an eye for the duty cycle slowly rises, has improved the stability of circuit. Adopt the utility model discloses a double -barrelled forward circuit is fit for the situation of heavy current, and is efficient, and stability is good.
Description
Technical field
This utility model belongs to switch power technology field, is designed specifically to normal shock switching power circuit, particularly a kind of
The double tube positive exciting switching power circuit of high efficiency high stability.
Background technology
Positive exciting switching voltage regulator is a kind of common electric source topology that energy is transmitted by transformator, different from circuit of reversed excitation,
It is mainly used in mid power occasion.Number according to the power switch pipe of transformer primary side is different, and positive exciting switching voltage regulator is divided into
The positive exciting switching voltage regulator of single tube and double tube positive exciting Switching Power Supply.Two poles that wherein double tube positive exciting Switching Power Supply is connected by power switch
Pipe carries out magnetic reset, it is not necessary to extra reset circuit, while the power switching voltage stress of double tube positive exciting Switching Power Supply is equal to
Input voltage, and the voltage stress of single tube forward converter switching tube is twice input voltage.
Existing double tube positive exciting circuit secondary circuit mostly adopts circuit shown in Fig. 1.When primary side switch pipe is opened, electric current
Flow out from vice-side winding Same Name of Ends, flow through D1, L1, load, and charge to electric capacity, when switching tube disconnects, D1 electric currents reduce, D2
Electric current increases, until primary voltage of transformer is reduced to 0.In this period of time, secondary forms short circuit current, is folded to former limit, makes
Primary current increase is obtained, pulse spike occurs.No matter during switching tube turn-on and turn-off, conducting electric current all flows through the pole of rectification two
Pipe and fly-wheel diode, and electric current is larger, and the loss on diode is larger, occurs pulse spike during dead band, not only increases
Plus the voltage stress of diode, inductance, also increase conduction loss.The feedback circuit of existing double tube positive exciting circuit is mostly using electricity
Resistance, the mode of electric capacity and stabilivolt gives UC384X chip power supplies, this power supply mode cause it is larger in ohmically power attenuation,
Resistance heating is larger, also affects power delivery efficiency.And the start-up course of chip still adopts hard reboot process, this startup
Process can cause the damage of chip, reduce the stability of circuit.
Utility model content
The purpose of this utility model is to propose a kind of double tube positive exciting switching power circuit, to solve current double tube positive exciting switch
Power-efficient is low, the problem of stability difference.
This utility model is achieved through the following technical solutions.
A kind of double tube positive exciting switching power circuit described in the utility model, including the double tube positive exciting network of transformer primary side
With secondary current-doubling rectifier and feedback circuit.
Described feedback circuit includes TL431 and optical coupling isolation circuit, and it is defeated that output voltage signal Jing potential-divider networks meet TL431
Enter end, one end of TL431 is grounded, and another termination optocoupler, optocoupler output connects the COMP ports of UC3844, is control chip
UC3844 provides error signal.The external circuitses of UC3844 include two diodes, electric capacity, resistance composition soft starting circuit,
Described soft starting circuit causes the pulse width of Switching Power Supply to be broadened by narrow in startup moment, and output voltage slowly rises.
UC3844 output termination isolated drive circuits, control chip output signal provides drive through isolated drive circuit for two switching tubes
Dynamic signal.
The double tube positive exciting network of described transformer primary side includes two main switches, the drive signal of UC3844 pass through every
It is divided into two groups of signals of identical after transformator, two respectively described main switches provide drive signal.Including an auxiliary
Winding, described assists winding provides power supply through a filter network for UC3844.
Described secondary current-doubling rectifier includes two energy storage inductors, two diodes and two electric capacity.Transformator pair
The Same Name of Ends of side winding and different name end respectively connect the different name end of an energy storage inductor, the Same Name of Ends ground connection of energy storage inductor.Transformer secondary
The Same Name of Ends of winding is respectively drawn end point and connects two poles in the connecting line with the connecting line of energy storage inductor and different name end with energy storage inductor
The forward end of pipe, two diodes merge in the positive level for accessing two shunt capacitances, the minus earth of two shunt capacitances.
Further described power switch pipe is GAN, is NPN type.
First coil different name of isolating transformer secondary described further terminates main transformer Same Name of Ends, isolating transformer
Second coil different name end ground connection of secondary.
Circuit described further includes current foldback circuit, and current foldback circuit is second main switch output termination
One small resistor, resistance front end draw signal after filtering circuit access UC3844 CS ports.
This utility model powers to reduce damaging by addition assists winding in former limit forward conversion circuit to control chip
Consumption.Current-doubling rectifier is used in secondary so that inductive current reduces half so that the circuit is adapted to the situation of high current, keeps away
The pulse spike that two diode circuits of secondary are caused is exempted from.In the feedback loop, by using soft starting circuit, power supply is reduced
Start instant feedback error so that dutycycle slowly rises, and improves the stability of circuit.
This utility model has the advantages that.
（1）This utility model increases assists winding, the electricity being made up of resistance, electric capacity and stabilivolt before reducing in former limit
The loss on road.
（2）Current-doubling rectifier is used in secondary so that the electric current for flowing through inductance and diode is original half, reduce
The ripple and pulse spike of electric current and voltage, reduce the loss that secondary circuit brings.
（3）The soft start of UC3844 chips improves the stability of circuit, reduces loss of the start-up course to chip.
（4）Overall double tube positive exciting flows again rectification efficiency and is improved.
Description of the drawings
Fig. 1 is traditional double tube positive exciting secondary circuit figure.
Fig. 2 is this utility model double tube positive exciting secondary circuit figure.
Fig. 3 gives control chip power supply circuit for tradition.
Fig. 4 gives control chip power supply circuit for this utility model.
Fig. 5 is this utility model control chip soft starting circuit figure.
Fig. 6 is this utility model transformer primary side double tube positive exciting circuit diagram.
Specific embodiment
It is new to this practicality below in conjunction with accompanying drawing to make the purpose of this utility model, technical scheme and advantage clearer
Type makees a more detailed elaboration.
Fig. 1 is traditional double tube positive exciting secondary circuit figure.As shown in figure 1, work as primary side switch pipe shutdown moment, due to former limit electricity
Also there is forward voltage in the effect of sense, former limit transformator two ends, this causes D1 diode currents to there is electric current, and D2 electric currents are gradually gone up
Rise, form short circuit current, circuital current is folded to former limit, form the pulse spike of primary current shutdown moment, and diode
Resistance it is larger, cause the loss in diode larger, affect power supply efficiency.Fig. 2 be this utility model implement it is two-tube just
Sharp secondary circuit figure, as shown in Fig. 2 when switching tube is opened, the total secondary Same Name of Ends of electric current flows out, through D1, C1//C2, L2,
Return to transformer secondary different name end, L1 inductance afterflows, through D1, then to electric capacity.When main switch disconnects moment, inductance L1 continues
Stream, by D1, to electric capacity, inductance L2 afterflows, through D2, to electric capacity, when primary voltage of transformer is to bear, electric current is from transformator
Secondary different name end is flowed out, through D2, electric capacity, L1, to transformator Same Name of Ends, inductance L2 afterflows through D2, to electric capacity.Can see
Go out, by inductance L1, L2 undertakes the electric current of load end simultaneously, inductive current is the half of load current, reduces bearing for inductance
Electric current, also meets the requirement of dispersion radiating, improves the stability of circuit.Simultaneously there is no short circuit and ask in circuit in conducting moment
Topic, eliminates the pulse spike of conducting moment, improves the efficiency of circuit.
Fig. 3 gives control core for tradition to control chip power supply circuit, input voltage vin Jing resistance, electric capacity and stabilivolt
Piece is powered, this power supply mode, and electric current by resistance, causes the loss of electric energy all the time.Fig. 4 is that utility model is supplied to control chip
Electrograph, is just starting several cycles, is powered to control chip by traditional power supply mode, after circuit turn-on, assists winding Ls two
End produce voltage, diode, filter circuit, inductance to control chip power switch pipe disconnection after, by inductance and electric capacity continue to
Chip power supply.This control mode is reduced in ohmically loss, improves the efficiency of power supply.
Fig. 5 is control chip soft starting circuit figure, and two diodes and the electric capacity being connected with diode constitute soft opening in figure
Dynamic circuit diagram, when power initiation moment, feedback error is too poor, can cause the dash current of moment, so need to reduce starting wink
Between feedback error, add soft starting circuit, error current Jing electric capacity releases, and this reduces feedback error, improves electricity
The stability on road.
To sum up, this utility model includes transformer primary side double tube positive exciting circuit, secondary current-doubling rectifier, feedback circuit.
Make and show after sample, power supply stability is high, efficiency reaches 92%.
Claims (3)
1. a kind of double tube positive exciting switching power circuit, is characterized in that including that the double tube positive exciting network of transformer primary side and secondary flow again
Rectification circuit and feedback circuit；
Described feedback circuit includes TL431 and optical coupling isolation circuit, and output voltage signal Jing potential-divider networks connect TL431 inputs
End, one end ground connection of TL431, another termination optocoupler, optocoupler output connects the COMP ports of UC3844, is control chip UC3844
Error signal is provided；The external circuitses of UC3844 include two diodes, and electric capacity, the soft starting circuit of resistance composition is described
Soft starting circuit causes the pulse width of Switching Power Supply to be broadened by narrow in startup moment, and output voltage slowly rises；UC3844 is defeated
Go out and terminate isolated drive circuit, control chip output signal provides drive signal through isolated drive circuit for two switching tubes；
The double tube positive exciting network of described transformer primary side includes two main switches, and the drive signal of UC3844 becomes through isolation
It is divided into two groups of signals of identical after depressor, two respectively described main switches provide drive signal；Including an assists winding,
Described assists winding provides power supply through a filter network for UC3844；
Described secondary current-doubling rectifier includes two energy storage inductors, two diodes and two electric capacity；Transformer secondary around
The Same Name of Ends and different name end of group respectively connects the different name end of an energy storage inductor, the Same Name of Ends ground connection of energy storage inductor；Transformer secondary winding
Same Name of Ends and energy storage inductor connecting line and each end point of drawing connects diode with the connecting line of energy storage inductor at different name end
Forward end, two diodes merge in the positive level for accessing two shunt capacitances, the minus earth of two shunt capacitances.
2. double tube positive exciting switching power circuit according to claim 1, is characterized in that described isolating transformer secondary
One coil different name terminates main transformer Same Name of Ends, second coil different name end ground connection of isolating transformer secondary.
3. double tube positive exciting switching power circuit according to claim 1, is characterized in that described circuit includes overcurrent protection
Circuit, current foldback circuit is second main switch output one small resistor of termination, and signal is drawn after filtering in resistance front end
Circuit accesses the CS ports of UC3844.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621050558.1U CN206149143U (en) | 2016-09-13 | 2016-09-13 | Double -barrelled just sharp switching power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621050558.1U CN206149143U (en) | 2016-09-13 | 2016-09-13 | Double -barrelled just sharp switching power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206149143U true CN206149143U (en) | 2017-05-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621050558.1U Expired - Fee Related CN206149143U (en) | 2016-09-13 | 2016-09-13 | Double -barrelled just sharp switching power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206149143U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571743A (en) * | 2016-09-13 | 2017-04-19 | 南昌大学 | Two-transistor forward switching power supply circuit |
-
2016
- 2016-09-13 CN CN201621050558.1U patent/CN206149143U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571743A (en) * | 2016-09-13 | 2017-04-19 | 南昌大学 | Two-transistor forward switching power supply circuit |
| CN106571743B (en) * | 2016-09-13 | 2023-07-28 | 南昌大学 | Double-tube forward switch power supply circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170503 Termination date: 20200913 |
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| CF01 | Termination of patent right due to non-payment of annual fee |