CN207184352U - A kind of AC/DC transfer circuit - Google Patents
A kind of AC/DC transfer circuit Download PDFInfo
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- CN207184352U CN207184352U CN201720985136.1U CN201720985136U CN207184352U CN 207184352 U CN207184352 U CN 207184352U CN 201720985136 U CN201720985136 U CN 201720985136U CN 207184352 U CN207184352 U CN 207184352U
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Abstract
The utility model discloses a kind of AC/DC transfer circuit, including at least two AC/DC transfer sub-circuits, and each sub-circuit includes：Primary circuit, isolating transformer, secondary side rectification circuit, secondary output filter capacitor and control circuit；The both ends of the isolating transformer primary side winding are connected with primary circuit, and the both ends of vice-side winding are connected with the both ends of secondary side rectification circuit, secondary output filter capacitor；The control circuit connects the primary circuit and secondary output filter capacitor；The one end for isolating transformer secondary winding in each AC/DC transfer sub-circuit is connected to same point, makes the superposition that output voltage is sub-circuit output voltage.By the way that the one end for isolating transformer secondary winding in each AC/DC transfer sub-circuit is connected into same point, so that the voltage of output group is the superposition of sub-circuit output voltage, so as to contribute to the working frequency ripple wave voltage frequency multiplication on output end filter capacitor, improve the low-frequency voltage current stress on each output end filter capacitor.
Description
Technical field
It the utility model is related to Switching Power Supply, more particularly to a kind of ac-dc conversion circuit.
Background technology
Belong to single-level power factor (Power Factor, abbreviation PF) rectifier of soft switch technique, active-clamp flyback,
Extensive utilization, Chinese patent literature CN103812359B disclose one in the supply for active clamp forward and its improvement project
Kind is single-phase or polyphase ac inputs high-power factor wide scope ac-dc conversion circuit, utilizes exchange input positive and negative half
The switch working state difference in week, multiplexing, which is born (just) to hold inverse switch pipe and bear, (just) holds input filter capacitor, realizes that clamp is opened
The function of pipe and clamping capacitance is closed, reduces the diode losses in commutating circuit, realizes the soft of just (negative) end inverse switch pipe
Switch, reduce the voltage stress and switching loss of primary side switch pipe and secondary commutation diode.But due to the input electricity of the circuit
When being pressed in steering zero crossings, because the clamp that primary side input filter capacitor has accumulation absorbs voltage so that defeated when exchanging commutation
It is zero to enter, and can not provide electric current.In addition, when the input of its circuit is connected to the alternating current source of multiple phase inputs, due to phase
Difference, the voltage fluctuation of capacitor scope amplitude of its output group are larger.
Utility model content
To solve the above problems, the utility model proposes a kind of ac-dc conversion circuit, it can effectively reduce output filter
Ripple amplitude on ripple capacitance voltage.
To achieve the above object, the utility model uses following technical scheme：
A kind of ac-dc conversion circuit, including at least two AC-DC converter sub-circuits, each sub-circuit bag
Include：Primary circuit, isolating transformer, secondary side rectification circuit, secondary output filter capacitor and control circuit；The isolating transformer
The both ends of primary side winding are connected with primary circuit, the both ends of vice-side winding and secondary side rectification circuit, secondary output filter capacitor
Both ends connect；The control circuit connects the primary circuit and secondary output filter capacitor；Each AC-DC converter sub-circuit
One end of middle isolation transformer secondary winding is connected to same point, makes the superposition that output voltage is sub-circuit output voltage.
Preferably, the primary circuit includes：Input rectification circuit, primary side input filter capacitor, primary side inverter circuit and
Drive circuit；The input rectification circuit connects ac input end, the both ends of the primary side input filter capacitor respectively with it is described
Anode and the negative terminal connection of input rectification circuit, the both ends of the primary side inverter circuit also respectively with the input rectification circuit
Anode and negative terminal connection, while loop is formed with primary side input filter capacitor, the drive circuit connects the primary side inversion electricity
Road.
Further preferably, the input rectification circuit includes the first and second input rectifying diodes, and described first is defeated
The anode for entering commutation diode connects ac input end with the negative electrode of the second input rectifying diode；The primary side input filter
Ripple electric capacity include two input high-frequency filter capacitors, two input high-frequency filter capacitor opposite ends respectively with the input rectifying
Anode and the negative terminal connection of circuit；The primary side inverter circuit includes the first and second inverse switch pipes, and described first and second
Inverse switch pipe is connected with the anode and negative terminal of the input rectification circuit respectively, one end of the isolating transformer primary side winding
Connected with first, second inverse switch pipe, the other end and the primary side input filter capacitor of the isolating transformer primary side winding
Intermediate point connects；The primary side inverter circuit also forms loop with primary side input filter capacitor, forms clamp resonance circuit, described
Inverse switch pipe is operated in zero voltage switching state.
Preferably, the secondary side rectification circuit includes secondary voltage doubling rectifing circuit and secondary full bridge rectifier.
Further preferably, the secondary voltage doubling rectifing circuit includes：Three, the 4th diodes and the three, the 4th electric capacity；
Wherein the one of the negative electrode of 3rd diode and the anode of the 4th diode and the isolating transformer vice-side winding is defeated
Go out end to be connected, the negative electrode of the 4th diode and one end of the output plus terminal of power supply and the secondary output filter capacitor connect
Connect, the anode of the 3rd diode is connected with the other end of the output negative terminal of power supply and the secondary output filter capacitor；
The third and fourth electric capacity series connection, another output end and the 3rd to the 4th electric capacity of the isolating transformer vice-side winding
Intermediate point connects, the output plus terminal of the 3rd capacitance connection power supply, the output negative terminal of the 4th capacitance connection power supply；It is described
The intermediate point connection same point of three, the 4th electric capacity in each AC-DC converter sub-circuit.
Further preferably, the three, the 4th electric capacity is the electrodeless electric capacity or polarized electric capacity of two series connection, and
In the case of for polarized electric capacity, the positive pole of the 3rd electric capacity connects the output plus terminal of power supply, the negative pole of the 4th electric capacity
Connect the output negative terminal of power supply.
Further preferably, the secondary full bridge rectifier includes：Three, the four, the 5th and the 6th diode, it is described
The negative electrode of 3rd diode and the anode of the 4th diode and a wherein output end for the isolating transformer vice-side winding
It is connected, the negative electrode of the 4th diode and one end of the output plus terminal of power supply and the secondary output filter capacitor connect,
The anode of 3rd diode is connected with the other end of the output negative terminal of power supply and the secondary output filter capacitor；It is described
5th and the 6th Diode series, another output end and the 5th to the 6th diode of the isolating transformer vice-side winding
Intermediate point connects, the output plus terminal of the negative electrode connection power supply of the 6th diode, the anode connection electricity of the 5th diode
The output negative terminal in source；The intermediate point connection same point of five, the 6th diodes in each AC-DC converter sub-circuit.
Preferably, the isolating transformer be magnetic core be provided with air gap isolating transformer or primary side be in series with resonant inductance
Isolating transformer or secondary be in series with the isolating transformer of energy storage inductor.
Preferably, the isolating transformer is normal shock actuating coil and the single vice-side winding of flyback actuating coil multiplexing
Transformer.
Preferably, each alternating current source of at least two AC-DC converters sub-circuit has input zero line and each sub-circuit
The midpoint of primary side input filter capacitor be connected to the input zero line；Or each alternating current source without input zero line and each exchange-
The intermediate point connection same point of the primary side input filter capacitor of DC converting sub-circuit.
The beneficial effects of the utility model：By the way that transformer secondary winding will be isolated in each AC-DC converter sub-circuit
One end be connected to same point so that the voltage of output group be sub-circuit output voltage superposition, so as to contribute to output end to filter
Working frequency ripple wave voltage frequency multiplication on ripple electric capacity, improves the low-frequency voltage current stress on each output end filter capacitor.In addition, tool
There is the characteristics of frequency in input AC source is higher, its fluctuation is smaller, therefore be more suitable for the high alternating current source of frequency.
Brief description of the drawings
Fig. 1 is the circuit diagram of the ac-dc conversion circuit in the utility model embodiment one.
Fig. 2 is the transformer equivalent structure schematic diagram of circuit shown in Fig. 1.
Fig. 3 is the switching tube driver' s timing figure in available circuit.
Fig. 4 is contactor pipe driver' s timing figure of the present utility model.
Fig. 5 is the circuit diagram of the three-phase and four-line voltage doubling rectifing circuit of the utility model embodiment two.
Fig. 6 is that the Topology connection of translation circuit shown in Fig. 5 is schemed.
Fig. 7 is the circuit diagram of the phase three-wire three voltage doubling rectifing circuit of the utility model embodiment two.
Fig. 8 is the circuit diagram of the three-phase and four-line voltage doubling rectifing circuit of the utility model embodiment three.
Fig. 9 is that the Topology connection of translation circuit shown in Fig. 8 is schemed.
Figure 10 is the circuit diagram of the phase three-wire three voltage doubling rectifing circuit of the utility model embodiment three.
Figure 11 is the circuit diagram of the three-phase and four-line full bridge rectifier of the utility model embodiment three.
Figure 12 is the circuit diagram of the phase three-wire three full bridge rectifier of the utility model embodiment three.
Embodiment
With reference to embodiment and compare accompanying drawing the utility model is described in further detail, it should be emphasised that
It is, what the description below was merely exemplary, rather than in order to limit the scope of the utility model and its application.
Embodiment one
Ac-dc conversion circuit as shown in Figure 1 includes
Primary circuit 100, high-frequency isolation transformer T1, secondary circuit 200 and control circuit 300.Primary circuit 100 is wrapped again
Include input rectification circuit 110, primary side input filter capacitor 120 and primary side inverter circuit 130；It is whole that secondary circuit 200 includes secondary
Current circuit 210 and secondary output filter capacitor 220.
Input rectification circuit 110 includes two input rectifyings diode D1, D2, input rectifying diode D1 anode and defeated
Enter commutation diode D2 negative electrode connection exchange input live wire L.
Primary side input filter capacitor 120 includes two input High frequency filters using exchange input zero line N as the series connection at midpoint
Electric capacity C1, C2, two input high-frequency filter capacitors C1, C2 the opposite ends anode and negative terminal with the input rectification circuit respectively
Connection.
Primary side inverter circuit 130 includes first, second inverse switch pipe Q1, Q2, the first, second inverse switch pipe
Q1, Q2 are connected with the anode and negative terminal of the input rectification circuit 110 respectively, one end of the isolating transformer T1 primary side windings
Connected with described first, second inverse switch pipe Q1, Q2, the other end is connected with exchange input zero line N, the primary side inverter circuit
130 also form loop with primary side input filter capacitor C1, C2, form clamp resonance circuit, inverse switch pipe Q1, Q2 work
In ZVS states.By controlling inverse switch pipe Q1, Q2 gate voltage, DC voltage can be converted into pulse voltage be added in every
From the primary side winding of transformer.The switching tube of clamping action is played in inverse switch pipe Q1, Q2 by controlling, resonance can be controlled electric
Flow the break-make of return circuit.
The secondary side rectification circuit 210 is that normal shock and flyback work commutating circuit, including the 3rd diode D3, the four or two pole
Pipe D4, the 3rd electric capacity C3 and the 4th electric capacity C4, the negative electrode of the 3rd diode D3 and the anode of the 4th diode D4 and
A wherein output end for the isolating transformer vice-side winding is connected, and the output of the negative electrode and power supply of the 4th diode D4 is just
V+ and secondary output filter capacitor C5 one end connection is held, the output of the anode and power supply of the 3rd diode D3 is born
The end V- and secondary output filter capacitor C5 other end is connected, another output of the isolating transformer vice-side winding
End is connected with secondary the three, the 4th electric capacity C3, C4 intermediate point, and the positive pole of the 3rd electric capacity C3 is (when using polarized electric capacity
When) output plus terminal V+, the 4th electric capacity C4 negative pole output that connects power supply (when using polarized electric capacity) that connects power supply bears
End.Secondary the three, the 4th electric capacity C3, C4 can also use polarized electric capacity.
The principle connected according to circuit, on the electric capacity of its normal shock performance loop and the electric capacity of flyback performance loop voltage have with
The identical or complementary form of waveform trend after input AC rectification, and the voltage of normal shock tank capacitance and defeated with primary side
Entering voltage change has approximately linear variation relation.
The working condition of the first, second inverse switch pipe is controlled by the control circuit so that input current with
The fundamental wave of input voltage is consistent, so as to realize high input power factor correction.
Because input circuit is that rectification is carried out to alternating voltage, therefore the capacity for inputting high-frequency filter capacitor C1, C2 is little, its
Parameter for the resonant frequency that clamps mainly by determining.So this circuit ensure that input current can have ready conditions follow it is defeated
Enter voltage, to ensure the input power factor of power supply and total harmonic distortion (Total Harmonics Distortion, abbreviation
THD)。
When exchanging input, just (negative) half cycle (the corresponding exchange negative half period of following bracket content) will pass through input rectifying two
Pole pipe D1 (D2) carries out rectification, and then primary side input filter capacitor C1 (C2) can carry out High frequency filter.Inverter line is then by inversion
Switching tube Q1 (Q2) and isolating transformer T1 are collectively formed.Now primary side clamp resonance circuit is by clamping capacitance C2 (C1), clamp
Switching tube Q2 (Q1) and primary transformer coil collectively form.Within the work period, according to the result of control circuit calculating, pass through
Drive circuit, apply the pwm signal of a high frequency to inverse switch pipe Q1, while be to the driving voltage on clamp switch pipe Q2
One with the PWM voltages of Q1 near-complementaries, have certain dead band delay relation between two PWM driving voltages.
The isolating transformer be magnetic core be provided with air gap isolating transformer or primary side be in series with the isolation of resonant inductance
Transformer or secondary are in series with the isolating transformer of energy storage inductor, and the size of magnetic core air gap is defeated by positive and negative sharp ratio and system
Enter output parameter to together decide on, the former and deputy side coefficient of coup without doing specific setting in addition.
Isolating transformer T1 magnetic core is provided with air gap, there is certain leakage inductance, make isolating transformer T1 work can in normal shock and
Two states of flyback.Its leakage inductance is obtained by natural technique for coiling, meanwhile, according to the actual needs, coiling work can be passed through
Skill changes to obtain changeable leakage inductance.Certainly, can also be in primary side if the leakage inductance sensibility reciprocal of natural coiling is insufficient to
Outer coilloading.
Isolating transformer does not have to the end points tie point for deliberately distinguishing primary side and secondary, that is, does not have to deliberately consider isolating transformer
Initiating terminal.
Refering to Fig. 2, when isolating transformer T1 coilings are completed, main the magnetizing inductance Lm and leakage inductance Lr of its primary side are determined.It is former
The leakage inductance on side switching frequency relative with resonant capacitance C2 (C1) resonant frequency meets relationship below：
Related performance loop and principle is as follows：
Due to exchange input when, positive half cycle and negative half period have symmetry, therefore, below using exchange input positive half cycle as
Example.
State one：
Positive half cycle will input and carry out rectification by diode D1, and then electric capacity C1 can carry out High frequency filter.In the work period
Interior, according to the feedback of input voltage, control circuit calculates result, by drive circuit, applies one to inverse switch pipe Q1
The pwm signal of high frequency.When inverter switching device pipe Q1 is opened, transformer primary side magnetizing inductance Lm and resonant inductance Lr1 are opened
Beginning linear-charging, when the electric current of primary side is equal to exciting current, the voltage V2 of secondary coupling rises to VLr2+VC4When, diode D4
Conducting, i.e. voltage V2 are clamped；Secondary current is I2, the electric current approximation I of primary sideLr=ILm+I2/n.This state is whole for exporting
Stream is just as normal normal shock, simultaneously as input rectifying voltage is sinusoidal pattern, input high-frequency filter capacitor capacitance is smaller, institute
Near sinusoidal type is also turned into the voltage waveform on electric capacity C4, with input voltage VinThere is approximate 1/n linear relationship.
State two：
When inverter switching device pipe Q1 is turned off, inverter switching device pipe Q1 parasitic capacitances are electrically charged, its charging process
It is resonance, for no other reason than that parasitic capacitance is smaller, the charging interval is very short, can be considered as linear.Secondary leakage inductance or external simultaneously
Inductance Lr2 potential VLr2Deflect, it is intended to maintain the original sense of current and size constant, but over time, its
Necessarily begun to decline by inductance or commutation diode D4 electric current.
State three：
As inverter switching device pipe Q1, its parasitic capacitor voltage is charged to sufficiently high, about voltage VC2+Vin, clamp switch
Pipe Q2 is anti-and diode is turned on by positively biased.Clamping capacitance C2 is by resonant inductance Lr1 and magnetizing inductance Lm voltage clamping in voltage
VC2, because big more of parasitic capacitances of the clamping capacitance C2 than inverse switch pipe Q1, most resonance currents enter clamping capacitance
C2, clamping capacitance C2 and resonant inductance Lr1 start resonance；When the electric current of primary side is equal with exciting current, transformer secondary
Output current is equal to zero, while alternation occurs for secondary coupled voltages V2 potentials.
State four：
When original edge voltage drop to it is sufficiently low, coupled voltages V2 corresponding to secondary make enough diode D3 positively biaseds turn on.This
When secondary to reflex to the voltage of primary side be about n (Vo-VC3-VLr2), it can obtain ZVS for clamp switch pipe Q2 and provide condition,
Now clamp switch pipe Q2 driving voltage will be changed into high level and turn on.Under this working condition pattern, it was stored in originally
Energy cup in transformer air gap discharges.The state is a typical flyback transformer job.Due on electric capacity C4
Voltage and input voltage be a linear relationship, so the voltage on electric capacity C3 synthesized with the voltage complementary on electric capacity C4 it is defeated
Go out voltage.
State five：
When clamp switch pipe Q2 is turned off, clamping capacitance C2 is forced to depart from former resonant tank, while resonant inductance Lr1 will be with
Inverse switch pipe Q1 parasitic capacitance forms new resonance；To discharge the electric charge of parasitic capacitance, done for inverse switch pipe Q1 ZVS
Prepare.
State six：
After Q2 drives shut-off certain time, by the resonance in state five by the electricity of inverse switch pipe Q1 parasitic capacitance
Lotus discharges completely, while carries out afterflow by inverse switch pipe Q1 anti-and diode, and now inverse switch pipe Q1 obtains ZVS and opened
Gating condition.
State seven
Now, inverse switch pipe Q1 driving voltage is changed into high level and turned on；The inductance of primary side will by linear-charging,
Start the new cycle, repeat the state procedure of the above.
In the utility model ac-dc conversion circuit, input filter capacitor also fills in addition to as input filter function
Work as clamp function, auxiliary realizes the Sofe Switch work of primary side inverter switching device pipe, inverse switch pipe in addition to inverse switch function,
Act also as clamp switch.That is, circuit of the present utility model can make full use of the switch working state of exchange input positive-negative half-cycle
Difference, multiplexing is negative (just) to hold inverse switch pipe and negative (just) end input filter capacitor, realizes clamp switch pipe and clamping capacitance
Function, similar three level rectifying technologies, reduce the diode losses in commutating circuit.Primary side input filter capacitor can be
One or second inverse switch pipe shut-off when and isolating transformer leakage inductance produce resonance, obtain clamp switch pipe and inverse switch pipe
Zero voltage switching (ZVS), by resonance by the energy transmission of high-frequency isolation transformer leakage inductance to secondary, avoid the energy of leakage inductance
Loss and moment cause the due to voltage spikes of inverse switch pipe.Meanwhile the diode losses in commutating circuit are reduced, realize just (negative)
The Sofe Switch of inverse switch pipe is held, reduces the voltage stress and switching loss of primary side switch pipe and secondary commutation diode.Utilize
The voltage multiplying rectifier of secondary, the voltage stress of secondary commutation diode was both reduced, also simultaneously by normal shock energy and flyback energy shape
Into different loops, so as to cleverly realize the similar energy transmission of the power-factor correction of similar routine.That is output voltage
It is voltage of the proportional input voltage (normal shock energy) plus proportional inductance storage energy (flyback energy).
As shown in figure 3, it is prior art CN103812359B switching tube driver' s timing figure：1., 3. region, inversion
Switching tube Q2 (or Q1) does not send out PWM drivings, then the clamp that C2 (or C1), which occurs, accumulation absorbs electric flux, so as to voltage progressively
Raise；And when exchanging commutation, input is some low-voltage near zero or zero, it may appear that moment input voltage amplitude is less than electricity
Hold voltage magnitude, so as to which input rectifying diode D1 or D2 are reverse biased, input can not turn on and provide electric current, therefore defeated
Entering current harmonics can be deteriorated.
Contactor pipe driver' s timing figure of the present utility model is as shown in figure 4, by CN103812359B 1., 3. area
Domain, two regions will be increased newly by negative value or on the occasion of the certain area for turning to zero crossings in input voltage, i.e., in corresponding diagram 4
The 5., the 6. region, apply the pwm signal of a high frequency to inverse switch pipe Q1 (Q2) in this region, while to clamp
Driving voltage on switching tube Q2 (Q1) is the PWM voltages with Q1 (Q2) near-complementary, is had between two PWM driving voltages
Certain dead band delay relation, by setting the 5., the 6. driving dutycycle of Regional Admin and clamper tube, make clamping capacitance
Energy can be by being discharged into outlet side when reverse resonance；In the region, translation circuit works in flyback mode, when defeated
Enter voltage the 5., 6. during region, clamp switch pipe Q2 (or Q1) just works according to above-mentioned clamp approaches, can effectively carry
The reliability of high circuit, improve the harmonic wave of alternating voltage zero crossings, avoid the occurrence of such as prior art CN103812359B
In situation.
The analysis of the state one-level state four in mode of operation more than, in ac-dc conversion circuit, every
It is linear transformer to can be compared to from transformer, and the reduction of the linear scale of input voltage is input to electric capacity C4, while isolates transformation
Device cans be compared to PFC inductance in ordinary power factor correction circuit again, and the energy stored in being turned in switching tube turns off in switching tube
When discharge to electric capacity C3, therefore the voltage on electric capacity C3, C4 constitutes a linear scale with conventional without the PFC isolated electricity
Pressure.So circuit realizes isolated PFC well, and single-stage isolated formula ac-dc conversion circuit known to this advantage
Not available.
, will be by diode D2 rectifications when negative half period of the input voltage for exchange, then it is high to carry out input by electric capacity C2
Frequency filters.Inverter line is then collectively formed by inverse switch pipe Q2 and isolating transformer T1 primary coils；Now primary side clamp is humorous
The circuit that shakes is collectively formed by clamping capacitance C1, clamp switch pipe Q1 and primary transformer coil.Electric capacity C3, C4 voltage wave simultaneously
Shape also turn by symmetry, and electric capacity C3 serves as the output capacitance in normal shock loop, and C4 serves as the output capacitance in flyback loop.Other work
State principle and control method are consistent with foregoing positive half-wave.
Analyzed more than, in this circuit, inverse switch pipe, the high-frequency filter capacitor of primary side are positive and negative partly in input voltage
By dexterously time-sharing multiplex it is clamp switch pipe and clamping capacitance when all, input rectifying loop need to only pass through a diode
, while output also only needs just to form commutating circuit by a diode.Therefore, the simple in circuits of this circuit, efficiency
It is high.
Embodiment two
The utility model also provides the ac-dc conversion circuit that a kind of two-phase, three-phase or more mutually input.Such as Fig. 5 institutes
It is shown as a kind of three-phase and four-line voltage multiplying rectifier translation circuit, basic circuit composition, the contactor pipe driver' s timing of its each sub-circuit
And beneficial effect is identical with embodiment one, difference is：Input is three-phase.Its benefit can be obtained than the output voltage of embodiment one
The more preferable output voltage of characteristic, output voltage is more smooth, and ripple voltage is smaller, and the ripple amplitude on the electric capacity of its output group is such as
Shown in Fig. 6, wherein lines 10 and 11 represent the voltage on electric capacity, and other three lines represent the three-phase voltage of input.In Fig. 5,
D1a, D2a, D1b, D2b, D1c, D2c represent primary side commutation diode, and C1a, C2a, C1b, C2b, C1c, C2c represent primary side filtering
Electric capacity, Q1a, Q2a, Q1b, Q2b, Q1c, Q2c expression primary side inverse switch pipe, T1a, T1b, T1c indication transformer, D3a, D4a,
D3b, D4b, D3c, D4c represent secondary commutation diode, and C3a, C4a, C5b, C3b, C4b, C5b, C3c, C4c, C5c represent secondary
Filter capacitor.
Similarly, the present embodiment also provides the ac-dc conversion circuit that another two-phase, three-phase or more mutually input, Fig. 7
A kind of phase three-wire three voltage multiplying rectifier translation circuit is shown, basic circuit composition and beneficial effect are identical with Fig. 5, and difference is：It is defeated
Enter no zero line input.Its benefit is to be inputted in actual phase three-wire three without zero line in use environment, can still realize aforementioned properties.
Circuit as described above be all secondary side by D3x, D4x and C3x, voltage doubling rectifing circuit that C4x is formed, including figure
Multiphase voltage doubling rectifing circuit circuit shown in single-phase voltage doubling rectifier circuit shown in 1, Fig. 5 and Fig. 7.The utility model also provides separately
The ac-dc conversion circuit that a kind of single-phase, two-phase, three-phase or more mutually input, its secondary side by D3x, D4x and D5x,
The full bridge rectifier that D6x is formed, it can equally realize effect as above.Except such as voltage doubling rectifing circuit and full bridge rectifier
Outside, other rectification circuits can similarly realize effect as above.
Embodiment three
The utility model also provides the ac-dc conversion circuit that a kind of two-phase, three-phase or more mutually input.Such as Fig. 8 institutes
Show, be a kind of three-phase and four-line input AC-DC transfer circuit, each sub-circuit includes primary circuit 100, high-frequency isolation becomes
Depressor T1, secondary circuit 200 and control circuit, and one end connection for isolating transformer secondary winding in its each sub-circuit is same
Point.
Specifically, primary circuit 100 includes input rectification circuit, primary side input filter capacitor and primary side inverter circuit；It is secondary
Side circuit 200 includes secondary side rectification circuit and secondary output filter capacitor, and its each sub-circuit and the exchanging of Fig. 1 in embodiment one-
DC transfer circuit is identical.
Three-phase and four-line input AC-DC transfer circuit shown in Fig. 8 converts with the three-phase and four-line voltage multiplying rectifier shown in Fig. 5
The difference of circuit is：The intermediate point connection same point of the electric capacity of secondary the three, the 4th in each AC-DC converter sub-circuit, i.e.,
Isolate the Same Name of Ends connection same point of transformer secondary winding in each ac-dc conversion circuit.Its benefit is：Each conversion
The frequency of ripple and input AC source on the capacitance voltage of sub-circuit output group is 2 times of relation, because the circuit is three-phase
Input AC-DC transfer circuit, after 3 voltage doubling rectifing circuit electric capacity intermediate points are connected, 6 times of relation is formed, its
Ripple amplitude on the capacitance voltage of output group is as shown in figure 9, wherein, lines 12 and 13 represent the voltage on electric capacity, other
Three lines represent the three-phase voltage of input.Compared to Fig. 6, the AC-DC varying circuit in the present embodiment, the filtering of its output end
Working frequency ripple wave voltage frequency multiplication on electric capacity, ripple amplitude can be reduced to 1/3rd or so, therefore improve each output end filtering
Low-frequency voltage current stress on electric capacity.In addition, if the frequency of the exchange of input is higher, its fluctuation is smaller, therefore more suitable
The high alternating current source of sum of fundamental frequencies rate.
The switching tube driver' s timing of each sub-circuit and beneficial effect are identical with embodiment one in the circuit.
The switching sequence of three-phase as described above is consistent, its voltage V exported0May be three kinds of situations：V0=V2a+
V2bOr V0=V2c+V2bOr V0=V2a+V2c, compared to the voltage V exported in Fig. 50=V2aOr V2bOr V2cFor, its voltage output
Scope is wider, is more beneficial for the higher occasion of output voltage.
In addition, by the way that the switching sequence of three-phase to be set to certain phase relation, it is possible to achieve the maximum of output current is straight
For reducing the energy storage effect of electric capacity.
Similarly, phase three-wire three voltage doubling rectifing circuit as shown in Figure 10, its basic circuit composition and beneficial effect and Fig. 8 institutes
The three-phase and four-line voltage doubling rectifing circuit shown is identical, and difference is：Input inputs without zero line.Make in actual phase three-wire three without zero line input
With in environment, aforementioned properties can be still realized.
Three-phase input ac-dc conversion circuit as shown in figs is all secondary side by D3x, D4x and C3x,
The voltage doubling rectifing circuit that C4x is formed.In addition, as is illustrated by figs. 11 and 12, its secondary side is by D3x, D4x and D5x,
The full bridge rectifier that D6x is formed, the intermediate point of the diode of secondary the five, the 6th in its each AC-DC converter sub-circuit
Same point is connected, i.e., isolates the Same Name of Ends connection same point of transformer secondary winding in each ac-dc conversion circuit, equally may be used
To realize such as effect as above.
It is appreciated that：In addition to the primary circuit as shown in embodiment three, using other primary circuits, pass through
The one end for isolating transformer secondary winding in each ac-dc conversion circuit is connected into same point, can also equally realize output
Working frequency ripple wave voltage frequency multiplication on filter capacitor is held, improves the effect of the low-frequency voltage current stress on each output end filter capacitor
Fruit.
Above content is to combine specific/preferred embodiment further detailed description of the utility model, no
It can assert that specific implementation of the present utility model is confined to these explanations.For the common skill of the utility model art
For art personnel, without departing from the concept of the premise utility, it can also make to the embodiment that these have been described
Some replacements or modification, and these are substituted or variant should all be considered as belonging to the scope of protection of the utility model.
Claims (10)
1. a kind of ac-dc conversion circuit, it is characterised in that described each including at least two AC-DC converter sub-circuits
Sub-circuit includes：Primary circuit, isolating transformer, secondary side rectification circuit, secondary output filter capacitor and control circuit；It is described every
Both ends from transformer primary side winding are connected with primary circuit, and both ends and secondary side rectification circuit, the secondary output of vice-side winding are filtered
The both ends connection of ripple electric capacity；The control circuit connects the primary circuit and secondary output filter capacitor；Each AC-DC becomes
The one end for changing isolation transformer secondary winding in sub-circuit is connected to same point, makes output voltage for the folded of sub-circuit output voltage
Add.
2. ac-dc conversion circuit as claimed in claim 1, it is characterised in that the primary circuit includes：Input rectifying
Circuit, primary side input filter capacitor, primary side inverter circuit and drive circuit；
The input rectification circuit connects ac input end, and the both ends of the primary side input filter capacitor are whole with the input respectively
Anode and the negative terminal connection of current circuit, the both ends of the primary side inverter circuit also respectively with the anode of the input rectification circuit and
Negative terminal connects, while forms loop with primary side input filter capacitor, and the drive circuit connects the primary side inverter circuit.
3. ac-dc conversion circuit as claimed in claim 2, it is characterised in that
The input rectification circuit includes the first and second input rectifying diodes, the anode of the first input rectifying diode
Ac input end is connected with the negative electrode of the second input rectifying diode；
The primary side input filter capacitor includes two input high-frequency filter capacitors, the opposite end of two input high-frequency filter capacitors
It is connected respectively with the anode and negative terminal of the input rectification circuit；
The primary side inverter circuit includes the first and second inverse switch pipes, the first and second inverse switches pipe respectively with institute
The anode for stating input rectification circuit is connected with negative terminal, and one end and first, second inversion of the isolating transformer primary side winding are opened
Pipe series connection is closed, the other end of the isolating transformer primary side winding is connected with the intermediate point of primary side input filter capacitor；The original
Side inverter circuit also forms loop with primary side input filter capacitor, forms clamp resonance circuit, and the inverse switch pipe is operated in
Zero voltage switching state.
4. ac-dc conversion circuit as claimed in claim 1, it is characterised in that the secondary side rectification circuit includes secondary
Voltage doubling rectifing circuit and secondary full bridge rectifier.
5. ac-dc conversion circuit as claimed in claim 4, it is characterised in that the secondary voltage doubling rectifing circuit includes：
Three, the 4th diodes and the three, the 4th electric capacity；The negative electrode of 3rd diode and the anode of the 4th diode and institute
The wherein output end for stating isolating transformer vice-side winding is connected, the negative electrode of the 4th diode and the output plus terminal of power supply with
And one end connection of the secondary output filter capacitor, the anode of the 3rd diode and the output negative terminal of power supply and described
The other end of secondary output filter capacitor is connected；The third and fourth electric capacity series connection, the isolating transformer vice-side winding
Another output end is connected with the intermediate point of the 3rd to the 4th electric capacity, the output plus terminal of the 3rd capacitance connection power supply, described
The output negative terminal of 4th capacitance connection power supply；The intermediate point of the three, the 4th electric capacity connects in each AC-DC converter sub-circuit
Connect same point.
6. ac-dc conversion circuit as claimed in claim 5, it is characterised in that the three, the 4th electric capacity is two strings
The electrodeless electric capacity or polarized electric capacity of connection, and in the case of for polarized electric capacity, the positive pole of the 3rd electric capacity connects power supply
Output plus terminal, the negative pole of the 4th electric capacity connects the output negative terminal of power supply.
7. ac-dc conversion circuit as claimed in claim 4, it is characterised in that the secondary full bridge rectifier includes：
Three, the four, the 5th and the 6th diode, the negative electrode of the 3rd diode and the anode of the 4th diode and it is described every
A wherein output end from transformer secondary winding is connected, the negative electrode of the 4th diode and output plus terminal and the institute of power supply
State one end connection of secondary output filter capacitor, the anode of the 3rd diode and output negative terminal and the secondary of power supply
The other end of output filter capacitor is connected；5th and the 6th Diode series, the isolating transformer vice-side winding it is another
One output end is connected with the intermediate point of the 5th to the 6th diode, and the output of the negative electrode connection power supply of the 6th diode is just
End, the output negative terminal of the anode connection power supply of the 5th diode；The 5th in each AC-DC converter sub-circuit,
The intermediate point connection same point of six diodes.
8. ac-dc conversion circuit as claimed in claim 1, it is characterised in that the isolating transformer is that magnetic core is out
There is the isolating transformer of air gap or primary side is in series with the isolating transformer of resonant inductance or secondary is in series with the isolation of energy storage inductor
Transformer.
9. ac-dc conversion circuit as claimed in claim 1, it is characterised in that the isolating transformer is normal shock work
The transformer of coil and the single vice-side winding of flyback actuating coil multiplexing.
10. ac-dc conversion circuit as claimed in claim 1, it is characterised in that at least two AC-DC becomes
Change each alternating current source of sub-circuit have input zero line and the primary side input filter capacitor of each sub-circuit midpoint be connected to it is described defeated
Enter zero line；Or the centre of primary side input filter capacitor of each alternating current source without input zero line and each AC-DC converter sub-circuit
Point connection same point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720985136.1U CN207184352U (en) | 2017-08-08 | 2017-08-08 | A kind of AC/DC transfer circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720985136.1U CN207184352U (en) | 2017-08-08 | 2017-08-08 | A kind of AC/DC transfer circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207184352U true CN207184352U (en) | 2018-04-03 |
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ID=61745517
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|---|---|---|---|
| CN201720985136.1U Expired - Fee Related CN207184352U (en) | 2017-08-08 | 2017-08-08 | A kind of AC/DC transfer circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107332452A (en) * | 2017-08-08 | 2017-11-07 | 深圳市保益新能电气有限公司 | A kind of AC/DC transfer circuit control method and its circuit |
| CN117060748A (en) * | 2023-08-21 | 2023-11-14 | 哈尔滨工业大学 | Single-stage bridgeless isolation flyback rectifier based on double-capacitance output structure |
-
2017
- 2017-08-08 CN CN201720985136.1U patent/CN207184352U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107332452A (en) * | 2017-08-08 | 2017-11-07 | 深圳市保益新能电气有限公司 | A kind of AC/DC transfer circuit control method and its circuit |
| CN117060748A (en) * | 2023-08-21 | 2023-11-14 | 哈尔滨工业大学 | Single-stage bridgeless isolation flyback rectifier based on double-capacitance output structure |
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Granted publication date: 20180403 Termination date: 20200808 |