CN108377098A - A kind of constant voltage outputting circuit of twin-stage input inverter - Google Patents
A kind of constant voltage outputting circuit of twin-stage input inverter Download PDFInfo
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- CN108377098A CN108377098A CN201810371416.2A CN201810371416A CN108377098A CN 108377098 A CN108377098 A CN 108377098A CN 201810371416 A CN201810371416 A CN 201810371416A CN 108377098 A CN108377098 A CN 108377098A
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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
- 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
- H02M3/337—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 in push-pull configuration
- H02M3/3376—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 in push-pull configuration with automatic control of output voltage or current
- H02M3/3378—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 in push-pull configuration with automatic control of output voltage or current in a push-pull configuration of the parallel type
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention discloses a kind of constant voltage outputting circuit of twin-stage input inverter, including push-pull transformer, change-over switch K1, switch driving circuit, current rectifying and wave filtering circuit, the push-pull transformer passes through change-over switch K1 connection current rectifying and wave filtering circuits, the input winding of the push-pull transformer includes that two the number of turns are identical, with centre tapped winding, it is the identical independent winding of two the number of turns that it, which exports winding, the normally-closed contact of change-over switch K1 is separately connected the B of two output windings of push-pull transformer, C-terminal mouth, normally opened contact connects A, the ports D, make the armature of relay in release conditions, two output winding ports of normally-closed contact connection are in internal short circuit state and are not connect with current rectifying and wave filtering circuit, to which two output windings in series of push-pull transformer be exported；And in armature of relay attracting state, two output winding parallel outputs of push-pull transformer.The present invention shares a push-pull transformer for 12V or 24V inputs, realizes constant pressure output.
Description
Technical field
The present invention relates to constant voltage outputting circuit design fields more particularly to a kind of twin-stage to input inverter
Constant voltage outputting circuit.
Background technology
With the rise of the Renewable green energies such as photovoltaic generation, inverter application and correlative study are increasingly extensive and deep
Enter.It is widely used in family, corporate server, satellite relay station even aerospace cause.Booster circuit is inversion electricity
One key component in source, the key index of its job stability, safety, response sensitivity etc. all affect entire inverse
The normal operation of variable power source system.
In booster circuit, it is common to use mode have：Push-Pull (push-pull type topology), Weinberg Circuit
(Weinberg's circuit topology), Half-Bridge (semibridge system topology), Full-Bridge (full-bridge type topology) etc. are several, wherein
The most commonly used is Push-Pull (push-pull type topology).For these types of topology, input voltage is limited to narrow
Range is to ensure a fixed transformation ratio, and when input voltage varies widely, boosting output par, c voltage can mistake
Height may burn high voltage electric part.Although the excessively high mesh that can reach setting voltage output by PWM modulation of output voltage
, but thus can reduce power supply conversion efficiency (pulse width of PWM drive signal is very narrow at this time, cause power supply conversion ratio drop
It is low).Therefore in the coupling scheme of multi-input switch converter, the corresponding respective circuit for power conversion of each input or by compared with
Complicated control circuit, although the case where when having adapted to different input voltages in this way, system schema cost is higher, economy
Decline.
Invention content
It is an object of the invention to the boost DC-DC constant pressure outputs by studying the twin voltage input based on push-pull type topology
The key technology of DC converter provides a kind of constant voltage outputting circuit of twin-stage input inverter, to overcome prior art institute
Existing deficiency.
The present invention the technical solution to solve the technical problem is that：A kind of constant voltage outputting circuit of twin-stage input inverter,
Including push-pull transformer, change-over switch K1, switch driving circuit, current rectifying and wave filtering circuit, the push-pull transformer is by turning
Change switch K1 connection current rectifying and wave filtering circuits, it is characterised in that：The input winding of the push-pull transformer includes two the number of turns phases
With, carry centre tapped winding, output winding be the identical independent winding of two the number of turns, the switch driving circuit
Including triode, zener diode, resistance, capacitance, the anode tap connecting triode base stage of zener diode, zener diode
Cathode terminal DC power supply is connected to by resistance R2；The base circuit of triode is made of resistance R1 and capacitance C4 parallel connections, base
One end of polar circuit is grounded；The relay coil of the collector terminal connection change-over switch K1 of triode, and on relay coil
A sustained diode 7 in parallel, sustained diode 7 are connected to DC power supply with relay coil；Change-over switch K1 is double-pole
Double-throw type relay, normally-closed contact are separately connected B, the C-terminal mouth of two output windings of push-pull transformer, and normally opened contact connects
The port A, D is connect, makes the armature of relay in release conditions, two output winding ports of normally-closed contact connection are in internal short circuit
It state and is not connect with current rectifying and wave filtering circuit, to by two output windings in series outputs of push-pull transformer；And in relay
When armature attracting state, two output winding parallel outputs of push-pull transformer.
The a reference value of the zener diode is chosen in 15V between 21V.
The zener diode includes the zener diode D5 and D6 being connected in series with, and is met：15V ＜ (VD5+VD6) ＜
21V。
The current rectifying and wave filtering circuit includes diode D1-D4.
The current rectifying and wave filtering circuit includes two alminium electrolytic condensers in parallel.
The beneficial effects of the invention are as follows：
1) present invention employs pure hardware circuit design schemes, and response is fast, and reliability is high, is not present during longtime running
" crash " problem of software Program.For dual input state, the compound window voltage comparator circuit of two-way is devised, it is real
Current potential virtual protection is showed；The winding construction of conventional push-pull boosting high frequency transformer is improved, and is devised matched
Constant pressure switching circuit；And for output constant pressure switching mode, it is proposed that series connection in parallel solution.These key technologies
Design scheme can be the effect of offering reference of actual engineer application.
2) the above design scheme is applied in actual inverter, and (12V and 24V) carries out tight under different input voltages
The test of lattice has passed through transient response test when high power load.Dual input function, which reduces, wants the stringent of input power
It asks, there is practicability.
Description of the drawings
Fig. 1 is the push-pull transformer electrical block diagram of the present invention.
Fig. 2 is the schematic block circuit diagram of the present invention.
Fig. 3 is the serial or parallel connection output constant pressure conversion circuit figure of the present invention.
Fig. 4 is the serial or parallel connection output constant pressure conversion circuit principle of equal effects schematic diagram of the present invention, wherein Fig. 4 (a) is string
Connection output constant pressure conversion circuit equivalent schematic diagram, Fig. 4 (b) is Parallel opertation constant pressure conversion circuit equivalent schematic diagram.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to
The embodiment of attached drawing description is exemplary, and is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term "center", " transverse direction ", "upper", "lower", "left", "right",
The orientation or positional relationship of the instructions such as "vertical", "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings,
It is merely for convenience of description of the present invention and simplification of the description, spy must be had by not indicating or implying the indicated device or element
Fixed orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.Unless otherwise indicated,
The meaning of " plurality " is two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should broadly understood, for example, it may be being fixedly connected；It may be a detachable connection or integral type connects；
It can be mechanical connection, can also be electrical connection；It can be directly connected, can also indirectly connected through an intermediary, it can be with
It is the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood as the case may be
Concrete meaning of the language in the present invention.
Referring to Fig. 1-4, the present invention provides a kind of constant voltage outputting circuit of twin-stage input inverter, including push-pull type transformation
Device, change-over switch K1, switch driving circuit, current rectifying and wave filtering circuit, the push-pull transformer are whole by change-over switch K1 connections
Flow filter circuit, it is characterised in that：The input winding of the push-pull transformer includes that two the number of turns are identical, carries center
The winding of tap, output winding are the identical independent winding of two the number of turns, and the switch driving circuit includes triode, steady
Diode, resistance, capacitance, the anode tap connecting triode base stage of zener diode, the cathode terminal of zener diode is pressed to pass through electricity
Resistance R2 is connected to DC power supply；The base circuit of triode is made of resistance R1 and capacitance C4 parallel connections, a termination of base circuit
Ground；The relay coil of the collector terminal connection change-over switch K1 of triode, and an afterflow two in parallel on relay coil
Pole pipe D7, sustained diode 7 are connected to DC power supply with relay coil；Change-over switch K1 is double-pole double throw type relay,
Its normally-closed contact is separately connected B, the C-terminal mouth of two output windings of push-pull transformer, and normally opened contact connects A, D port, make after
Electric appliance armature in release conditions, two output winding ports of normally-closed contact connection be in internal short circuit state and not with rectification
Filter circuit connects, to export two output windings in series of push-pull transformer；And in armature of relay attracting state
When, two output winding parallel outputs of push-pull transformer.It is described in detail below：
Multi-voltage grade inputs the component part that step-up DC constant pressure output translator is common in inverter.This hair
Bright emphasis is designed for the automatic constant-pressure switching circuit of 12V and 24V twin voltages grade (hereinafter referred to as twin-stage) input switch power supply
Scheme.Output constant pressure automatic switch-over circuit ensures the voltage output for having safety and stability under different input voltages.Current potential logic is supervised
Slowdown monitoring circuit can be judged according to the different conditions (under-voltage, over-pressed, normal) of inlet highway voltage, to by controlling PWM
The start and stop of module and the entire circuit of control.
In push-pull topology (Push-Pull), transformer input, output winding are generally made of two groups of symmetric windings, and
Centre carries tap.Symmetrical input winding so that transformer core is operated in third class working condition, and electric source topology is becoming
Possess good magnetic core utilization rate during changing.In the case where input direct-current voltage is Ui, if transformation ratio is K, then electricity is exported
Pressure meets Uo=Ui/K；If at this time by new DC voltage Ui'=2UiAs input, then this stylish output voltage meets Uo’
=Ui'/K=2Uo.As it can be seen that in different input voltages, overvoltage output phenomenon will be generated.
In order to solve problem above, the output of the transformer of push-pull topology circuit is designed as two independent windings, such as Fig. 1
It is shown.And the serial or parallel connection mode of the independent output winding of switching two is gone by peripheral circuit, or pass through switching voltage-transformation
Device exports the rectifier system corresponding to the alternating voltage of winding so that circuit output is constant pressure, to solve over-pressed phenomenon.Become
The input winding of depressor is that the identical winding of two the number of turns is constituted, and carries centre cap, uses n respectively11、n12Indicate the number of turns.
It is that the identical independent winding of two the number of turns is constituted to export winding, uses n respectively21、n22Indicate the number of turns.Assuming that the number of turns n11=n12=N1,
The number of turns n21=n22=N2.According to known condition such as input voltage Ui, output voltage Uo, output power Po, PWM frequency f and account for
Sky ratio D, estimates efficiency eta, can solve coil current density j, and then chooses required transformer core specification and enameled wire
The parameters such as diameter.N1、N2Value can be according to following equations：
There is constant electricity when the output constant voltage circuit of the automatic switchover after step-up transformer may insure different inputs
Pressure output is applied in the booster circuit of twin-stage input inverter, and twin-stage inputs the booster circuit of inverter mainly by pushing away
Pull boost topology circuit, PWM circuit for regulating and controlling, current potential virtual protection circuit, automatic frequency adjustment circuit, output constant pressure are automatic
Switching circuit, output overvoltage protection circuit, switching tube conduction voltage drop overcurrent protection circuit, boosting output rectifier and filter
And a few part compositions such as accessory power supply.Its master-plan block diagram such as Fig. 2.Low-tension supply (12V or 24V) is used as entire power supply
The input of circuit.It is supplied to control circuit to be used as power supply by auxiliary power circuit output stable 15V and 5V；Automatic frequency
Adjustment circuit can be according to input voltage level adjustment oscillating circuit parameter to ensure that PWM frequency adapts to；Push-pull type booster circuit
Driven by pwm signal, with output constant pressure automatic circuit match, according to input voltage automatic decision (12V or 24V) into
Row circuit switches, by the square wave high pressure that different low-voltage direct Input transformations is the constant 380V (virtual value) of output voltage, then
By the rear class busbar high pressure for obtaining 380V all the way after output rectifier and filter.
Further include overcurrent protection and overvoltage crowbar in entire design scheme, two-way protection circuit draws as feedback signal
Enter PWM Enable Pins.Current foldback circuit utilizes the inner resistance of transistor, by the conduction voltage drop electricity for monitoring crystal switch pipe
Pressure, judges whether there is overcurrent, short circuit phenomenon in boost process, if any then shutdown PWM outputs in time；And overvoltage crowbar is
The case where by monitoring output voltage, has overpressure situation to immediately turn off PWM outputs.
The input winding of the connect transformer of push-pull type topology is two N1The winding of circle coil, output winding are two independences
The number of turns be N2Winding constitute.When input voltage is UiWhen, it is U that two output windings, which respectively export virtual value,oSquare wave electricity
Pressure；When input voltage is 2UiWhen, each winding output virtual value that exports is 2UoSquare-wave voltage.Based on this, design is following defeated
Go out the scheme of constant pressure automatic switchover：
It is U in input voltage referring to Fig. 3iWhen=12V, two output winding inequalities connect to form a 2N2New output
Winding can obtain 2U by transformer principle formula in this wayoHigh voltage output；It is 2U in input voltageiWhen=24V, two defeated
Go out winding and corresponds to one N of formation in parallel2The new output winding of circle, equally can obtain its output by transformer principle formula is
2UoHigh pressure.Therefore, the principle of constant pressure is to design a serial and parallel switching circuit.
In Fig. 3, two output windings of step-up transformer have been connected to a dpdt relay, and relay coil K1 is logical
The 17.1V voltage status reverse circuits for crossing R2, D6, D5, R1, C4, Q1 composition are controlled.
When input terminal voltage (V-BAT) is less than 17.1V (input 12V situations), Q1 base drive voltages are approximately 0V,
Fail to meet triode ON condition, then the armature of relay is in release conditions (state of Fig. 3 repeat circuits), by circuit
Analysis is it is found that port ' OUT B ' and ' OUT C ' are in internal short circuit state, and are not connect with rectification circuit, and hold at this time
Mouthful ' OUT A ' and ' OUT D ' are formed as output, that is, by two output windings in series outputs of transformer after series connection
The number of turns of coil is 2N2, therefore it is 2U to export virtual valueoSquare-wave voltage, shown in the principle of equal effects such as Fig. 4 (a)；Similarly it is found that
When input terminal voltage (V-BAT) is higher than 17.1V (input 24V situations), Q1 base drive voltages are approximately 0.7V (triodes
PN junction clamping action is equivalent to base stage to one diode of emitter series connection), meet triode ON condition, then relay
Armature is in attracting state, by circuit analysis it is found that port ' OUT A ' and ' OUT C ' and ' OUT B ' and ' OUT D ' at this time
Internal short circuit output in pairs, that is, by two output winding Parallel opertations of the same name of transformer, i.e., the coil formed after in parallel
The number of turns is N2, that is, output virtual value is 2UoSquare-wave voltage, shown in the principle of equal effects such as Fig. 4 (b).So, also
Realize the purpose of constant pressure conversion.
The program realizes the switching of constant pressure output for two different input voltages, in follow-up rectifier circuit portion,
Using bridge rectifier.It is used here four fast recovery diode RHRP8120 (D4, D3, D1, D2 in figure).Defeated
Go out to filter link, using two alminium electrolytic condensers (470uF/400V) in parallel, to obtain steady dc voltage output.
Although an embodiment of the present invention has been shown and described, it will be understood by those of ordinary skill in the art that：Not
In the case of being detached from the principle of the present invention and objective a variety of change, modification, replacement and modification can be carried out to these embodiments,
The scope of the present invention is limited by claim and its equivalent replacement, without creative work improvements introduced etc., should all be wrapped
Containing within protection scope of the present invention.
Claims (5)
1. a kind of constant voltage outputting circuit of twin-stage input inverter, including push-pull transformer, change-over switch K1, switch drive
Circuit, current rectifying and wave filtering circuit, the push-pull transformer pass through change-over switch K1 connection current rectifying and wave filtering circuits, it is characterised in that：
The input winding of the push-pull transformer includes that two the number of turns are identical, carries centre tapped winding, and output winding is
The identical independent winding of two the number of turns, the switch driving circuit include triode, zener diode, resistance, capacitance, voltage stabilizing two
The anode tap connecting triode base stage of pole pipe, the cathode terminal of zener diode are connected to DC power supply by resistance R2；Triode
Base circuit be made of resistance R1 and capacitance C4 parallel connections, one end of base circuit ground connection；The collector terminal connection of triode turns
Change the relay coil of switch K1, and a sustained diode 7 in parallel on relay coil, 7 same relay of sustained diode
Device coil is connected to DC power supply；Change-over switch K1 is double-pole double throw type relay, and normally-closed contact is separately connected push-pull type change
B, the C-terminal mouth of two output windings of depressor, normally opened contact connects the port A, D, makes the armature of relay in release conditions, normally closed to touch
Two output winding ports of point connection are in internal short circuit state and are not connect with current rectifying and wave filtering circuit, thus by push-pull type transformation
Two output windings in series outputs of device；And in armature of relay attracting state, two output winding parallels of push-pull transformer
Output.
2. the constant voltage outputting circuit of twin-stage input inverter according to claim 1, it is characterised in that：Two pole of the voltage stabilizing
The a reference value of pipe is chosen in 15V between 21V.
3. the constant voltage outputting circuit of twin-stage input inverter according to claim 2, it is characterised in that：Two pole of the voltage stabilizing
Pipe includes the zener diode D5 and D6 being connected in series with, and is met：15V ＜ (VD5+VD6) ＜ 21V.
4. inputting the constant voltage outputting circuit of inverter according to claims 1 or 2 or 3 twin-stages, it is characterised in that：It is described whole
It includes diode D1-D4 to flow filter circuit.
5. the constant voltage outputting circuit of twin-stage input inverter according to claim 4, it is characterised in that：The rectifying and wave-filtering
Circuit includes two alminium electrolytic condensers in parallel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810371416.2A CN108377098B (en) | 2018-04-23 | 2018-04-23 | Constant voltage output circuit of two-stage input inverter power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810371416.2A CN108377098B (en) | 2018-04-23 | 2018-04-23 | Constant voltage output circuit of two-stage input inverter power supply |
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| CN108377098A true CN108377098A (en) | 2018-08-07 |
| CN108377098B CN108377098B (en) | 2023-10-03 |
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| CN201810371416.2A Active CN108377098B (en) | 2018-04-23 | 2018-04-23 | Constant voltage output circuit of two-stage input inverter power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110233572A (en) * | 2019-07-11 | 2019-09-13 | 苏州华兴源创科技股份有限公司 | A kind of constant pressure source and constant-voltage outputting method |
| CN112491252A (en) * | 2020-12-30 | 2021-03-12 | 深圳市永联科技股份有限公司 | Driving method and circuit for improving reliability of SIC MOSFET |
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| CN112491252A (en) * | 2020-12-30 | 2021-03-12 | 深圳市永联科技股份有限公司 | Driving method and circuit for improving reliability of SIC MOSFET |
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| CN108377098B (en) | 2023-10-03 |
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