CN106655791B - A kind of inverse-excitation type switch power-supply - Google Patents
A kind of inverse-excitation type switch power-supply Download PDFInfo
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- CN106655791B CN106655791B CN201710142832.0A CN201710142832A CN106655791B CN 106655791 B CN106655791 B CN 106655791B CN 201710142832 A CN201710142832 A CN 201710142832A CN 106655791 B CN106655791 B CN 106655791B
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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
Abstract
A kind of inverse-excitation type switch power-supply, on the basis of common three winding absorbs flyback converter, the N in transformer BP1Termination power of the same name, and the second primary side winding NP2Same Name of Ends ground connection, and guarantee NP1And NP2For Double-wire parallel wound, increase one end and the N of capacitor a C1, C1P1Different name end is connected, the other end and NP2Different name end is connected, and is achieved: when Q1 saturation conduction, NP1And NP2All excitations, when Q1 shutdown, secondary side NSEnergy is exported, and the energy of leakage inductance is by NP2Lossless Snubber is realized through D1, is suitble to work at low voltage, improves utilization rate, the current density of primary side winding, therefore power density is big, allows the leakage inductance between former secondary side larger, conversion efficiency is high.
Description
Technical field
The present invention relates to field of switch power, in particular to inverse-excitation type switch power-supply.
Background technique
Currently, Switching Power Supply application is very wide, for input power in 75W hereinafter, to power factor (PF, Power
Factor, also referred to as power factor (PF)) occasion that is not required, inverse-excitation type (Fly-back) Switching Power Supply has charming advantage: electricity
Road topology is simple, wide input voltage range.Since element is few, the reliability of circuit is opposite just high, so using very wide.For side
Just, many documents are also referred to as reverse exciting switching voltage regulator, flyback sourse, flyback converter, and Japan and Taiwan are also known as flyback change
Parallel operation, flyback Switching Power Supply, flyback power supply.Common topology for AC/DC converter is as shown in Figure 1, the primitive type comes from
" the Switching Power Supply power converter topologies and design " that the written book number of doctor Zhang Xingzhu is ISBN978-7-5083-9015-4 the
Page 60, which is referred to herein simply as: bibliography 1.By rectifier bridge 101, filter circuit 200 and basic flyback topologies list
First circuit 300 forms, and 300 are also referred to as main power stage, and practical circuit is before rectifier bridge also added with varistor, NTC temperature-sensitive
Resistance, EMI (Electromagnetic Interference) etc. protect circuit, to ensure that the Electro Magnetic Compatibility of flyback sourse reaches
To requirement.Inverse-excitation type switch power-supply requires the leakage inductance between former vice-side winding the smaller the better, and such conversion efficiency is high, and
The pressure resistance that primary side master power switch pipe is born also reduces, for using RCD network as the flyback converter of degaussing, absorption, RCD
The loss of network also reduces.Note: RCD absorbs the absorbing circuit for referring to resistance, capacitor, diode composition, the same state of the document in China
It is the same on border, resistance is generally numbered and represented to resistance with letter r, numbers and represent capacitor to capacitor with letter C, with alphabetical D
Number and represent diode to diode, resistance and capacitor are in parallel, then with RCD network is formed after Diode series.
Rectifier bridge 101 is generally made of four rectifier diodes, and when rectifier bridge 101 is not present, 200,300 be may be constructed
DC/DC Switching Power Supply or converter because being direct current supply, there is no the requirement of power factor, power can accomplish 75W with
On.In fact, in low voltage DC/DC Switching Power Supply using flyback topologies and it is non-mainstream, this is because inverse-excitation type is opened in low pressure
The input current in powered-down source is discontinuous, and ripple is larger, to the more demanding of power supply unit before；It is also discontinuous to export electric current,
Ripple is very big, high to the capacity requirement of subsequent filter capacitor；Especially when input voltage is lower, since excitation current becomes
Greatly, primary side winding must using multi cord and around；The inductance of primary side winding is relatively low, and the number of turns for often occurring calculating cannot
It tiles around the left side to the right of the wire casing of full skeleton, it can be using the side of sandwich series connection winding when especially operating voltage is higher
Case is forced the scheme using sandwich parallel connection winding under low-work voltage, since two primary side windings are not in same layer, this
Just there is leakage inductance between two primary side windings, this leakage inductance can generate loss, so that the efficiency of Switching Power Supply is allowed to be lower, two parallel connections
Primary side winding between leakage inductance cause the problem of:
1) when excitation, since leakage inductance exists, there are pressure differences in leakage inductance for induced electricity pressure difference, cause very important damage
Consumption, is understood that and is easier: if two poor circles of primary side winding the number of turns in parallel, are equivalent to there are this circle turn-to-turn short circuit,
Only comparatively no real turn-to-turn short circuit is lost by the DC internal resistance short circuit of two primary side windings in parallel
It is so big.
2) when degaussing, i.e., the rectifier diode conducting on secondary side charges to output filter capacitor afterflow, at this moment, primary side induction
Reflected voltage out, two primary side windings in parallel can induce unequal voltage, since the internal resistance of winding is low, induce not phase
Deng voltage caused by electric current it is not small, so as to cause loss and biggish electromagnetic interference.
3) using if tertiary winding degaussing, the tertiary winding be in two primary side windings in parallel who and around it can only
Using two tertiary windings, the primary side winding in parallel with two and around then again and being unified into " tertiary winding ", technique is multiple respectively
Miscellaneous, the tertiary winding by two winding parallels is there is also that can induce unequal voltage, so as to cause loss and biggish electricity
Magnetic disturbance.
In fact, for common tertiary winding degaussing, advantage is lossless degaussing, and efficiency is higher, but the line of the tertiary winding
Diameter selection is also a problem: select thinner, with primary side winding and around more troublesome, be easy filament to break；If selecting
Line footpath identical with primary side winding, it is at high cost.Tertiary winding degaussing flyback converter, and make " three winding absorption flyback converter ".
Two primary side windings in parallel are applied to low voltage DC/DC Switching Power Supply, and low voltage DC/DC Switching Power Supply refers generally to input
Voltage is in 48V hereinafter, the low voltage DC of partial use/DC Switching Power Supply can work to direct current 160V, such as railway power supply.
Summary of the invention
In view of this, providing a kind of flyback the invention solves deficiency existing for existing low pressure inverse-excitation type switch power-supply
Formula Switching Power Supply, primary side winding can not use two sseparated parallel connections, it can allow leakage inductance between former vice-side winding compared with
Greatly, tertiary winding degaussing is not used, while conversion efficiency does not reduce, and loss when excitation and degaussing reduces.
The object of the present invention is achieved like this, a kind of inverse-excitation type switch power-supply, including a transformer, N-channel field effect
Ying Guan, the second capacitor, first diode, the second diode, transformer include the first primary side winding, the second primary side winding and secondary side
Winding, vice-side winding different name end are connect with the second diode anode, and the second diode cathode is connect with second capacitor one end, and shape
Just at output, vice-side winding Same Name of Ends is connect with the second capacitor other end, and it is negative to form output；The anode of input DC power is same
When be connected with the cathode of the first primary side winding Same Name of Ends, first diode, the first primary side winding different name end and N-channel field-effect tube
Drain electrode be connected；The anode of first diode is connected with the second primary side winding different name end, the source electrode of N-channel field-effect tube connection the
Two primary side winding Same Name of Ends, tie point connect the negative terminal of input DC power simultaneously；The grid of N-channel field-effect tube connects control
Signal；It is characterized by: the first primary side winding and the second primary side winding are Double-wire parallel wound, it further include first capacitor, first capacitor
One end be connected with the first primary side winding different name end, the other end of first capacitor is connected with the second primary side winding different name end.
The present invention also provides the equivalent programs of above scheme one, and scheme two: the object of the invention also can be achieved like this, and one
Kind inverse-excitation type switch power-supply, including a transformer, a N-channel field-effect tube, the second capacitor, first diode, the second diode,
Transformer includes the first primary side winding, the second primary side winding and vice-side winding, vice-side winding different name end and the second diode anode
Connection, the second diode cathode are connect with second capacitor one end, and form output just, and vice-side winding Same Name of Ends and the second capacitor are another
One end connection, and it is negative to form output；The anode of input DC power simultaneously with the drain electrode of N-channel field-effect tube, the second primary side around
Group different name end is connected, and the source electrode of N-channel field-effect tube is connected with the first primary side winding Same Name of Ends；Second primary side winding Same Name of Ends with
The cathode of first diode is connected, and the first primary side winding different name end is connected with the anode of first diode, and tie point connects simultaneously
The negative terminal of input DC power；The grid connection control signal of N-channel field-effect tube；It is characterized by: the first primary side winding and
Second primary side winding is Double-wire parallel wound, further includes first capacitor, and one end of first capacitor is connected with the first primary side winding Same Name of Ends,
The other end of first capacitor is connected with the second primary side winding Same Name of Ends.
The present invention also provides the technical solutions using P-channel field-effect transistor (PEFT) pipe, on the basis of above scheme one, power supply, two
Pole pipe, the polarity of Same Name of Ends will in turn (output rectifying part do not have in turn), then obtaining scheme three: a kind of inverse-excitation type is opened
Powered-down source, including a transformer, a P-channel field-effect transistor (PEFT) pipe, the second capacitor, first diode, the second diode, transformer include
First primary side winding, the second primary side winding and vice-side winding, vice-side winding different name end are connect with the second diode anode, and the two or two
Pole pipe cathode is connect with second capacitor one end, and forms output just, and vice-side winding Same Name of Ends is connect with the second capacitor other end, and
It is negative to form output；The negative terminal of input DC power is connected with the anode of the first primary side winding different name end, first diode simultaneously, the
One primary side winding Same Name of Ends is connected with the drain electrode of P-channel field-effect transistor (PEFT) pipe；The cathode of first diode and the second primary side winding are of the same name
End is connected, and the source electrode of P-channel field-effect transistor (PEFT) pipe connects the second primary side winding different name end, and tie point connects input DC power simultaneously
Anode；The grid connection control signal of P-channel field-effect transistor (PEFT) pipe；It is characterized by: the first primary side winding and the second primary side winding are
Double-wire parallel wound further includes first capacitor, and one end of first capacitor is connected with the first primary side winding Same Name of Ends, first capacitor it is another
End is connected with the second primary side winding Same Name of Ends.
The present invention also provides the equivalent programs of above scheme three, and the technical solution of P-channel field-effect transistor (PEFT) pipe is used for scheme two,
On the basis of above scheme two, power supply, diode, Same Name of Ends polarity will in turn (output rectifying part do not have to anti-mistake
Come), obtain scheme four: the object of the invention also can be achieved like this, a kind of inverse-excitation type switch power-supply, including a transformer, a P
Channel field-effect pipe, the second capacitor, first diode, the second diode, transformer include the first primary side winding, the second primary side around
Group and vice-side winding, vice-side winding different name end are connect with the second diode anode, the second diode cathode and second capacitor one end
Connection, and form output just, vice-side winding Same Name of Ends is connect with the second capacitor other end, and it is negative to form output；Input dc power
The negative terminal in source is connected with the drain electrode of P-channel field-effect transistor (PEFT) pipe, the second primary side winding Same Name of Ends simultaneously, the source electrode of P-channel field-effect transistor (PEFT) pipe
It is connected with the first primary side winding different name end；Second primary side winding different name end is connected with the anode of first diode, the first primary side around
Group Same Name of Ends is connected with the cathode of first diode, and tie point connects the anode of input DC power simultaneously；P-channel field-effect transistor (PEFT) pipe
Grid connection control signal；It is characterized by: the first primary side winding and the second primary side winding are Double-wire parallel wound, it further include first
Capacitor, one end of first capacitor are connected with the first primary side winding different name end, and the other end of first capacitor and the second primary side winding are different
Name end is connected.
Improvement as above-mentioned four kinds of schemes, it is characterised in that: the line footpath phase of the first primary side winding and the second primary side winding
Together.
Preferably, the second primary side winding participates in excitation by first capacitor.
Preferably, when PCB layout the physical pathway of the excitation current of the first primary side winding and the second primary side winding direction
On the contrary.
Working principle will be set forth in conjunction with the embodiments.The invention has the benefit that allowing former vice-side winding
Between leakage inductance it is larger, primary side still uses Double-wire parallel wound, and conversion efficiency is high, and EMI performance is very good.
Detailed description of the invention
Fig. 1 is the schematic diagram that existing inverse-excitation type switch power-supply is used for AC to DC；
Fig. 2 is the corresponding first embodiment schematic diagram of inverse-excitation type switch power-supply scheme one of the present invention；
Fig. 2-1 is the schematic diagram that first embodiment charges to capacitor C1 when powering on；
Fig. 2-2 is the polarity of voltage schematic diagram of first embodiment capacitor C1 charging complete after the power-up；
When Fig. 2-3 is Q1 saturation conduction in first embodiment, the schematic diagram of two-way excitation current 41,42 is generated；
Fig. 2-4 is Q1 cut-off in first embodiment, generates the schematic diagram of freewheel current 43, demagnetizing current 44；
Fig. 3 is corresponding two schematic diagram of embodiment of inverse-excitation type switch power-supply scheme two of the present invention；
Fig. 4 is corresponding three schematic diagram of embodiment of inverse-excitation type switch power-supply scheme three of the present invention；
Fig. 5 is corresponding four schematic diagram of embodiment of inverse-excitation type switch power-supply scheme four of the present invention.
Specific embodiment
First embodiment
Fig. 2 shows the schematic diagram of the inverse-excitation type switch power-supply of first embodiment of the invention, including a transformer B, a N ditches
Road field-effect tube Q1, the second capacitor C2, first diode D1, the second diode D2, transformer B include the first primary side winding NP1、
Second primary side winding NP2With vice-side winding NS, vice-side winding NSDifferent name end is connect with the second diode D2 anode, the second diode
D2 cathode is connect with second one end capacitor C2, and formed output just, in figure Vout+end, vice-side winding NSSame Name of Ends and
Two capacitor C2 other ends connection, and form that output is negative, in figure Vout-end；Input DC power UDC(hereinafter also referred to as direct current
Power supply UDC, power supply UDCOr UDC) anode+simultaneously with the first primary side winding NP1Same Name of Ends, the cathode of first diode D1 are connected,
First primary side winding NP1Different name end is connected with the drain D of N-channel field-effect tube Q1；The anode of first diode D1 and the second primary side
Winding NP2Different name end is connected, and the source S of N-channel field-effect tube Q1 connects the second primary side winding NP2Same Name of Ends, tie point connect simultaneously
Meet input DC power UDCNegative terminal-；The grid G connection control signal of N-channel field-effect tube Q1；It is characterized by: first is former
Side winding NP1With the second primary side winding NP2It further include first capacitor C1 for Double-wire parallel wound, one end of first capacitor C1 is former with first
Side winding NP1Different name end is connected, the other end of first capacitor C1 and the second primary side winding NP2Different name end is connected.
Same Name of Ends: with one end of black dots mark in winding in figure；
Different name end: there is no one end of black dots mark in figure in winding；
Control signal: including various square waves such as pwm pulse bandwidth modulation signals, PFM pulse frequency modulateds；
The B: the first primary side winding of transformer NP1With the second primary side winding NP2Its magnetic core is connected with dotted line in the figure, indicates it
To be wound on a transformer, same magnetic core is shared, not independent transformer is intended merely to that figure is clear, connection relationship
Simply, the technique of painting in figure has just been used.
In Fig. 2, the source electrode of N-channel field-effect tube Q1 connects the second primary side winding NP2Same Name of Ends, tie point connect simultaneously
Input DC power UDCNegative terminal-, i.e. the source electrode of field-effect tube Q1 connects input DC power UDCNegative terminal-, this is actually being answered
Do not exist directly in, this is because the principle Analysis of basic topology can all omit need not in field of switch power
The factor wanted.In practical applications, it is flat to detect all to access current sense resistor or current transformer for the source electrode of field-effect tube
Equal electric current or peak point current realize various control strategies, this to pass through current sense resistor or current transformer and source electrode phase
Even, equivalent to be connected with source electrode, this is the well-known technique of the art, and the application follows the rule of industry default.If using electricity
Current transformer, current transformer can appear in any one place of energizing loop, as the drain electrode of field-effect tube, such as first is former
The Same Name of Ends of side winding or different name end, and current transformer is in addition to " conducting wire " that traditional primary side is a circle, secondary side be multiturn
The magnetic core formula mutual inductor of coil, can also be Hall sensor.
Working principle: referring to fig. 2, when first capacitor C1 (for easy analysis, by the standard of textbook, hereinafter referred to as
Capacitor C1 or C1, other devices are same) in the absence of, circuit is exactly the inverse-excitation type switch power-supply of a tertiary winding degaussing, and second
Primary side winding NP2It is just dedicated " tertiary winding " at degaussing, but the present invention is exactly after having added capacitor C1, the work of circuit is former
Reason is compared with the prior art, entirely different；
When powering on, because reverse-biased without working, Q1's D1 does not also work Fig. 2 circuit because not receiving control signal, is equivalent to
Open circuit, then power supply UDCPass through the first primary side winding NP1It charges to C1, which passes through the second primary side winding N simultaneouslyP2Return to electricity
Source UDCNegative terminal, the direction to C1 charging current has been marked with two arrows as shown in Fig. 2-1, in figure, it is seen then that the first primary side around
Group NP1Charging current are as follows: flow to different name end from Same Name of Ends；Second primary side winding NP2Charging current are as follows: from different name end flow to
Same Name of Ends；NP1And NP2For Double-wire parallel wound, the two size of current are equal, the magnetic flux of generation is powering on the contrary, be completely counterbalanced by
When, power supply UDCIt being charged by two windings of transformer B to C1, the two windings are offset because mutual inductance acts on, it does not work, C1
It is equivalent to and passes through NP1And NP2DC internal resistance and power supply UDCParallel connection, C1 still play the role of power filter, decoupling；
Over time, the end voltage of C1 is equal to UDCVoltage, it is left just right negative, as shown in Fig. 2-2；
When Q1 is normally received control signal, by taking a cycle as an example, when the grid of Q1 is high level, Q1 saturation conduction,
Its internal resistance is equal to on-state internal resistance Rds(ON), for easy analysis, such case is regarded as straight-through, is a conducting wire, such as Fig. 2-3
Shown, D1 is in reverse-biased, is not involved in work；At this moment two-way excitation current is generated, shown in 41 and 42 in Fig. 2-3；
Electric current 41 are as follows: power supply UDCAnode passes through the first primary side winding NP1Same Name of Ends into NP1Different name bring out, the leakage of Q1
Pole is into the source electrode of Q1 goes out, and returns to power supply UDCNegative terminal；
Electric current 42 are as follows: the left anode of capacitor C1 is by the drain electrode of Q1 into the source electrode of Q1 goes out, then passes through the second primary side winding NP2's
Same Name of Ends is into NP2Different name bring out, return to the right negative terminal of capacitor C1；
For convenience, power supply UDCNegative terminal is it is assumed that for ground connection, referred to as, because the left anode of C1 is connect by the Q1 of saturation conduction
Power supply UDCNegative terminal is grounded, then, the voltage of the right negative terminal of C1 is about-UDC, during this excitation, if the end voltage of C1
Because of off-capacity, there is downward trend, it may be assumed that the trend risen occurs in the voltage of the right negative terminal of C1, and absolute value is less than UDC, that
During excitation, Q1 saturation conduction is to the first primary side winding NP1When excitation, Same Name of Ends induces positive voltage, the sense of different name end
Negative voltage should be gone out, size, which is equal to, is added in NP1The voltage at both ends is equal to UDC, at this moment, due to NP1And NP2It is double wrap and around NP2Both ends
Equally induce: Same Name of Ends induces positive voltage, and different name end induces negative voltage, and size is equal to UDC, this voltage can be straight to C1
Charging is connect, this is the process of a normal shock, so that any decline will not occur because of off-capacity in the end voltage of C1；Also have above
It states: power supply UDCIt being charged by two windings of transformer B to C1, the two windings are offset because mutual inductance acts on, it does not work, C1
It is equivalent to and passes through NP1And NP2DC internal resistance and power supply UDCParallel connection, power supply UDCIt is directly supplemented to C1 by extremely low DC internal resistance
Electric energy, end voltage maintain to stablize；
As it can be seen that 41 and 42 two-way excitation currents are parallel relationships, due to NP1And NP2Sensibility reciprocal is identical, and excitation voltage is identical, all
Equal to UDC, 41 and 42 essentially equal, during excitation, vice-side winding NSInduced voltage is equally generated by the turn ratio, this induction
Voltage is: Same Name of Ends induces positive voltage, and different name end induces negative voltage, and size is equal to UDCMultiplied by turn ratio n, i.e. NSIt induces down
Just upper negative voltage, the end Voltage Series of this voltage and C2 are added in the both ends of D2, and D2 is reverse-biased and is not turned on, at this moment secondary side phase
When in zero load, no output；
During excitation, 41 and 42 electric currents linearly increase upwards；Current direction is to flow in inductance from Same Name of Ends
Different name end；
In order to guarantee that Electro Magnetic Compatibility reaches requirement, there is skill in when wiring, observes 41 and 42 in Fig. 2-3,
41 be current direction clockwise, and 42 be counter clockwise direction, if also guaranteeing that one, the two electric currents are up times in cloth circuit board
Needle, the other is counterclockwise, then the magnetic flux generated when excitation can be offset in place observation a little further, in this way,
The EMI performance of inverse-excitation type switch power-supply of the invention will be very good.
The grid of Q1 becomes low level from high level, and Q1 also is become ending from saturation conduction, not due to the electric current in inductance
It can be mutated, although at this moment Q1 has ended, 41 and 42 electric currents are still to flow to different name end from Same Name of Ends, since the electric current of primary side returns
Road has been cut off, and the energy in magnetic core flows to different name end from Same Name of Ends on secondary side, referring to fig. 2-4, vice-side winding NSOccur from same
Name end flows to the electric current at different name end, as shown in Fig. 2-4 43, the initial size of the electric current=(41 and 42 Q1 shutdown moment it
With)/turn ratio n, which promotes D2 forward conduction, and by the D2 of forward conduction, charges to capacitor C2, Vout establish voltage or
Persistently export energy.This process is also the process of degaussing.
The output end of inverse-excitation type switch power-supply obtains energy when primary side winding disconnects power supply so gaining the name, and output voltage takes
The turn ratio certainly in loop control circuit, with the primary and secondary side of flyback transformer (the transformer B in series of drawing as shown in Figure 1, Figure 2)
It is unrelated；In energy transfer process, transformer B is not the effect of voltage of transformation, but across the effect of magnetic core afterflow, it is
The isolation version of One Buck-Boost converter body；So transformer B is also commonly known as flyback transformer；
Due to primary side winding and vice-side winding, it is unlikely to be Double-wire parallel wound under normal circumstances, certainly exists leakage inductance.Primary side
The energy stored on winding magnetizing inductance is transferred to vice-side winding N by transformer B after Q1 shutdownS, output end, still
Energy in leakage inductance does not transmit, and causes the both ends over-voltage of Q1 pipe and damages Q1 pipe.The present invention to leakage inductance carry out degaussing circuit by
D1 and the second primary side winding NP2Composition, working principle are as follows:
First primary side winding NP1With the second primary side winding NP2For Double-wire parallel wound, the leakage inductance between the two windings is zero, In
Q1 shutdown moment and after, the energy in leakage inductance is not transferred to secondary side, the second primary side winding NP2The electric flux of middle leakage inductance, electricity
Direction is flowed with direction when excitation, is flowed to different name end from Same Name of Ends, i.e., in Fig. 2-4, is flowed from bottom to top, opens D1, and this
A electric flux is by DC power supply UDCIt absorbs, leakage inductance demagnetizing current shown in formation 44；
First primary side winding NP1The electric flux of middle leakage inductance is coupled to the second primary side winding N by no leakage inductanceP2In, pass through
D1 realize degaussing, be similarly formed 44 shown in leakage inductance demagnetizing current；
It is clear that output voltage Vout is divided by turn ratio n, here it is in vice-side winding NSIt is formed in D2 conducting in primary side
" reflected voltage ", for degaussing well, reflected voltage cannot be greater than DC power supply UDCValue, this circuit just can be well
Work.Since 41 is identical with 42 electric current, the first primary side winding is identical with the line footpath of the second primary side winding, and such coiling is convenient,
Line footpath described here is identical, and further including themselves is all same size litz wire, and color can be different, i.e., multi cord twists
It closes, identifies for convenience, same specification wire rod its color including litz wire can be different.With the promotion of working frequency, high frequency
Electric current more tends to the surface flow in enameled wire, and in this case, litz wire can solve this problem.Certainly, using two kinds
The enameled wire of different colours is first made into litz wire, direct coiling, then separates the first primary side winding and the second primary side winding by color,
Or the line footpath and number of share of stock of the two windings are different from, and all equally realize goal of the invention.
As it can be seen that the present invention has many differences, mainly are as follows: traditional compared with traditional three winding absorbs flyback converter
" tertiary winding " that three winding absorbs flyback converter is not involved in excitation, is only involved in degaussing；And the tertiary winding is not present in the present invention,
Two primary side windings both participate in excitation, and in degaussing, the second primary side winding N thereinP2In but take part in the degaussing of leakage inductance, it is real
The Lossless Snubber of leakage inductance energy is showed.Just because of the Lossless Snubber of leakage inductance energy is realized, so, allow the leakage inductance on former and deputy side
It is larger, the conversion efficiency of converter is nor affected on, high efficiency has been achieved, and in the present invention, degaussing winding is second former
Side winding NP2, it is also to participate in excitation, improves the current density of primary side winding, improves the power density of converter.Directly
Galvanic electricity source UDCSource, can by alternating current after over commutation, by electrolytic capacitor filtering or valley-fill circuit filtering after obtain.
So compared with prior art, the method have the advantages that: allow leakage inductance between former vice-side winding compared with
Greatly, primary side still uses Double-wire parallel wound, and conversion efficiency is high；The current density for improving primary side winding improves the power of converter
Density；And it is suitable for the occasion of lower operating voltage.
Second embodiment
The present invention also provides the equivalent program of above-mentioned first embodiment, corresponding scheme two, referring to Fig. 3, a kind of inverse-excitation type is opened
Powered-down source, including transformer a B, N-channel field-effect tube a Q1, the second capacitor C2, first diode D1, the second diode D2,
Transformer B includes the first primary side winding NP1, the second primary side winding NP2With vice-side winding NS, vice-side winding NSDifferent name end and the two or two
The connection of pole pipe D2 anode, the second diode D2 cathode are connect with second one end capacitor C2, and form output just, for Vout in figure
+ end, vice-side winding NSSame Name of Ends is connect with the second capacitor C2 other end, and forms that output is negative, in figure Vout-end；Input
DC power supply UDCAnode+drain electrode with N-channel field-effect tube Q1 simultaneously, the second primary side winding NP2Different name end is connected, N-channel
The source electrode of field-effect tube Q1 and the first primary side winding NP1Same Name of Ends is connected；Second primary side winding NP2Same Name of Ends and first diode
The cathode of D1 is connected, the first primary side winding NP1Different name end is connected with the anode of first diode D1, and tie point connects input simultaneously
DC power supply UDCNegative terminal；The grid connection control signal of N-channel field-effect tube Q1；It is characterized by: the first primary side winding NP1
With the second primary side winding NP2It further include first capacitor C1, one end of first capacitor C1 and the first primary side winding N for Double-wire parallel woundP1
Same Name of Ends is connected, the other end of first capacitor C1 and the second primary side winding NP2Same Name of Ends is connected.
In fact, second embodiment is the deformation of first embodiment: on the basis of Fig. 2 of first embodiment, two being swashed
The Tandem devices of magnetic loop all exchange, i.e. NP1With Q1 transposition, while D1 and NP2Transposition, C1 still connect two
Among the tie point of a Tandem devices, the circuit of second embodiment Fig. 3 has just been obtained, since the source voltage of Q1 is to change,
So this circuit is to drive floatingly, it should which higher cost should be unable to generally use.
The summary of its working principle:
Referring to Fig. 3, for circuit when powering on, D1 is because reverse-biased without working, and Q1 does not also work because not receiving control signal, phase
When in open circuit, then power supply UDCPass through NP2It charges to C1, which passes through N simultaneouslyP1Return to power supply UDCNegative terminal, equally upper
When electric, power supply UDCIt being charged by two windings of transformer B to C1, the two windings are offset because mutual inductance acts on, it does not work,
C1, which is equivalent to, passes through NP2And NP1DC internal resistance and power supply UDCParallel connection, C1 still play the role of power filter, decoupling；
Over time, the end voltage of C1 is equal to UDCVoltage, it is right just and left negative；
When Q1 saturation conduction, internal resistance is equal to on-state internal resistance Rds(ON), with a conducting wire is regarded as above, at this moment generate two
Road excitation current；
The first via are as follows: power supply UDCAnode is by the drain electrode of Q1 into the source electrode of Q1 goes out, then passes through the first primary side winding NP1's
Same Name of Ends is into NP1Different name bring out, return to power supply UDCNegative terminal；
Second tunnel are as follows: the right anode of capacitor C1 passes through the second primary side winding NP2Same Name of Ends into NP2Different name bring out, Q1's
It drains into the source electrode of Q1 goes out, and returns to the left negative terminal of capacitor C1；
For convenience, power supply UDCNegative terminal is it is assumed that for ground connection, referred to as, because the left negative terminal of C1 is connect by the Q1 of saturation conduction
Power supply UDCAnode, then, the voltage of the right anode of C1 is about 2UDCOver the ground, during this excitation, if the end voltage of C1 because
There is downward trend in off-capacity, the i.e. voltage of the right anode of C1, and the both ends C1 absolute value is less than UDC, then in the process of excitation
In, Q1 saturation conduction is to the first primary side winding NP1When excitation, Same Name of Ends induces positive voltage, and different name end induces negative voltage, greatly
It is small be equal to be added in NP1The voltage at both ends is equal to UDC, at this moment, due to NP1And NP2It is double wrap and around NP2Both ends equally induce: same
Name end induces positive voltage, and different name end induces negative voltage, size UDC, this voltage can plug in C1, this is one
The process of normal shock, so that any decline will not occur because of off-capacity in the end voltage of C1；It is also described above: power supply UDCPass through change
Two windings of depressor B charge to C1, the two windings are offset because mutual inductance acts on, and do not work, C1, which is equivalent to, passes through NP1With
NP2DC internal resistance and power supply UDCParallel connection, power supply UDCBy extremely low DC internal resistance directly to C1 electric energy supplement, end voltage dimension
It is fixed to keep steady；
As it can be seen that the first via and the second road excitation current are parallel relationships, due to NP1And NP2Sensibility reciprocal is identical, excitation voltage phase
Together, it is equal to UDC, this two-way is essentially equal, during excitation, vice-side winding NSInduced voltage is equally generated by the turn ratio, it is of the same name
End induces positive voltage, and different name end induces negative voltage, and size is equal to UDCMultiplied by turn ratio n, i.e. NSInduce lower just upper negative electricity
Pressure, the end Voltage Series of this voltage and C2 are added in the both ends of D2, and D2 is reverse-biased and is not turned on, and at this moment secondary side is equivalent to zero load, nothing
Output；
During excitation, the first via and the second road excitation current linearly increase upwards；Current direction is in inductance
Different name end is flowed to from Same Name of Ends；
When Q1 ends, the electric current in inductance cannot be mutated, and the energy in magnetic core flows to different name end from Same Name of Ends on secondary side, secondary
Side winding NSOccur flowing to the electric current at different name end from Same Name of Ends, which is charged by the D2 of forward conduction to capacitor C2, Vout
It establishes voltage or persistently exports energy.This process is also the process of degaussing.
In second example, the circuit of degaussing is carried out by D1 and the second primary side winding N to leakage inductanceP2Composition, working principle are as follows:
Q1 shutdown moment and after, the energy in leakage inductance is not transferred to secondary side, the second primary side winding NP2Middle leakage inductance
Electric flux, current direction flow to different name end with direction when excitation, from Same Name of Ends, flow from bottom to top, open D1, and this
Electric flux is by DC power supply UDCIt absorbs, forms leakage inductance demagnetizing current circuit；
Equally, the first primary side winding NP1The electric flux of middle leakage inductance is coupled to the second primary side winding N by no leakage inductanceP2
In, degaussing is realized by D1, is similarly formed leakage inductance demagnetizing current circuit；
Second embodiment is the deformation of first embodiment, and working principle is equivalent, equally realization goal of the invention.As with N ditch
The technical solution of road field-effect tube can also realize with P-channel field-effect transistor (PEFT) pipe, P-channel field-effect transistor (PEFT) pipe under low-work voltage,
Cost be also it is relatively low, at this moment, on the basis of above-mentioned first embodiment, power supply, diode, Same Name of Ends polarity want anti-mistake
To come, output rectifying part does not have in turn, then 3rd embodiment is obtained, it is such as following.
3rd embodiment
Referring to fig. 4 and scheme above-mentioned three, a kind of inverse-excitation type switch power-supply, including a transformer B, a P-channel field are imitated
Should pipe Q1, the second capacitor C2, first diode D1, the second diode D2, transformer B include the first primary side winding NP1, it is second former
Side winding NP2With vice-side winding NS, vice-side winding NSDifferent name end is connect with the second diode D2 anode, the second diode D2 cathode
Connect with second one end capacitor C2, and formed output just, in figure Vout+end, vice-side winding NSSame Name of Ends and the second capacitor
C2 other end connection, and form that output is negative, in figure Vout-end；Input DC power UDCNegative terminal-simultaneously with the first primary side
Winding NP1Different name end, the anode of first diode D1 are connected, the first primary side winding NP1Same Name of Ends is with P-channel field-effect transistor (PEFT) pipe Q1's
Drain electrode is connected；The cathode of first diode D1 and the second primary side winding NP2Same Name of Ends is connected, and the source electrode of P-channel field-effect transistor (PEFT) pipe Q1 connects
Meet the second primary side winding NP2Different name end, tie point connect input DC power U simultaneouslyDCAnode+；P-channel field-effect transistor (PEFT) pipe Q1's
Grid connection control signal；First primary side winding NP1With the second primary side winding NP2It further include first capacitor C1 for Double-wire parallel wound,
One end of first capacitor C1 and the first primary side winding NP1Same Name of Ends is connected, the other end of first capacitor C1 and the second primary side winding
NP2Same Name of Ends is connected.
Comparison diagram 2 and Fig. 4, it is found that 3rd embodiment is exactly the power supply U first embodimentDC, diode D1,
One primary side winding NP1With the second primary side winding NP2Same Name of Ends polarity in turn, N pipe change into P pipe obtain.It is noted that
It is input power U in Fig. 4DCAnode be ground, belong to negative supply work Switching Power Supply, P-channel field-effect transistor (PEFT) pipe itself is also negative
Level driving, just properly.
So the same first embodiment of working principle, which is not described herein again, equally realization goal of the invention.
Fourth embodiment
The present invention also provides the equivalent programs of above-mentioned 3rd embodiment, referring to Fig. 5, a kind of inverse-excitation type switch power-supply, including
One transformer B, P-channel field-effect transistor (PEFT) pipe a Q1, the second capacitor C2, first diode D1, the second diode D2, transformer B include
First primary side winding NP1, the second primary side winding NP2With vice-side winding NS, vice-side winding NSDifferent name end and the second diode D2 anode
Connection, the second diode D2 cathode connect with second one end capacitor C2, and formed export just, in figure Vout+hold, secondary side around
Group NSSame Name of Ends is connect with the second capacitor C2 other end, and forms that output is negative, in figure Vout-end；Input DC power
Negative terminal-the drain electrode with P-channel field-effect transistor (PEFT) pipe Q1, the second primary side winding N simultaneouslyP2Same Name of Ends is connected, the source of P-channel field-effect transistor (PEFT) pipe Q1
Pole and the first primary side winding NP1Different name end is connected；Second primary side winding NP2Different name end is connected with the anode of first diode D1, the
One primary side winding NP1Same Name of Ends is connected with the cathode of first diode D1, tie point connect simultaneously the anode of input DC power+；
The grid connection control signal of P-channel field-effect transistor (PEFT) pipe Q1；First primary side winding NP1With the second primary side winding NP2For Double-wire parallel wound,
It further include first capacitor C1, one end of first capacitor C1 and the first primary side winding NP1Different name end is connected, and first capacitor C1's is another
End and the second primary side winding NP2Different name end is connected.
The fourth embodiment of Fig. 5 is the deformation of 3rd embodiment: on the basis of Fig. 4 of 3rd embodiment, two excitations
The Tandem devices in circuit all exchange, i.e. NP1With Q1 transposition, while D1 and NP2Transposition, C1 still connect at two
Connect primary side winding NP1And NP2Centre, just obtained the circuit of fourth embodiment Fig. 5, due to the source voltage of Q1 be change
, so, this circuit is to drive floatingly, it should which higher cost should be unable to generally use.
Comparison diagram 3 and Fig. 5, it is found that fourth embodiment is exactly the power supply U the second embodiment of Fig. 3DC, diode
D1, the first primary side winding NP1With the second primary side winding NP2Same Name of Ends polarity in turn, N pipe change into P pipe obtain.It infuses
It anticipates, input power U in Fig. 5DCAnode be ground, also belong to negative supply work Switching Power Supply, P-channel field-effect transistor (PEFT) pipe sheet
Body is also negative level driving, just properly.
So the same second embodiment of working principle, which is not described herein again, equally realization goal of the invention.
The above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
Limitation of the invention.For those skilled in the art, without departing from the spirit and scope of the present invention, also
Several improvements and modifications can be made, the pressure stabilizing that control loop realizes output are such as added, this is apparent by the prior art
It obtains, such as using the switching tube Q1 of other symbols, multiple-channel output is added in secondary side output, and filtering is filtered using π type, these change
It also should be regarded as protection scope of the present invention into retouching, no longer repeated here with embodiment, protection scope of the present invention should be with
Subject to claim limited range.
Claims (7)
1. a kind of inverse-excitation type switch power-supply, including a transformer, a N-channel field-effect tube, the second capacitor, first diode,
Two diodes, transformer include the first primary side winding, the second primary side winding and vice-side winding, vice-side winding different name end and the two or two
The connection of pole pipe anode, the second diode cathode connect with second capacitor one end, and is formed and exported just, vice-side winding Same Name of Ends and the
The connection of the two capacitor other ends, and it is negative to form output；The anode of input DC power simultaneously with the first primary side winding Same Name of Ends, first
The cathode of diode is connected, and the first primary side winding different name end is connected with the drain electrode of N-channel field-effect tube；The anode of first diode
It is connected with the second primary side winding different name end, the source electrode of N-channel field-effect tube connects the second primary side winding Same Name of Ends, and tie point is simultaneously
Connect the negative terminal of input DC power；The grid connection control signal of N-channel field-effect tube；It is characterized by: the first primary side around
Group and the second primary side winding are Double-wire parallel wound, and the first primary side winding and the second primary side winding both participate in excitation, further include the first electricity
Hold, one end of first capacitor is connected with the first primary side winding different name end, the other end of first capacitor and the second primary side winding different name
End be connected, first capacitor for realizing inverse-excitation type switch power-supply filtering and decoupling.
2. a kind of inverse-excitation type switch power-supply, including a transformer, a N-channel field-effect tube, the second capacitor, first diode,
Two diodes, transformer include the first primary side winding, the second primary side winding and vice-side winding, vice-side winding different name end and the two or two
The connection of pole pipe anode, the second diode cathode connect with second capacitor one end, and is formed and exported just, vice-side winding Same Name of Ends and the
The connection of the two capacitor other ends, and it is negative to form output；The anode of input DC power simultaneously with the drain electrode of N-channel field-effect tube, the
Two primary side winding different name ends are connected, and the source electrode of N-channel field-effect tube is connected with the first primary side winding Same Name of Ends；Second primary side winding
Same Name of Ends is connected with the cathode of first diode, and the first primary side winding different name end is connected with the anode of first diode, tie point
The negative terminal of input DC power is connected simultaneously；The grid connection control signal of N-channel field-effect tube；It is characterized by: first is former
Side winding and the second primary side winding are Double-wire parallel wound, and the first primary side winding and the second primary side winding both participate in excitation, further include the
One capacitor, one end of first capacitor are connected with the first primary side winding Same Name of Ends, the other end of first capacitor and the second primary side winding
Same Name of Ends be connected, first capacitor for realizing inverse-excitation type switch power-supply filtering and decoupling.
3. a kind of inverse-excitation type switch power-supply, including a transformer, a P-channel field-effect transistor (PEFT) pipe, the second capacitor, first diode,
Two diodes, transformer include the first primary side winding, the second primary side winding and vice-side winding, vice-side winding different name end and the two or two
The connection of pole pipe anode, the second diode cathode connect with second capacitor one end, and is formed and exported just, vice-side winding Same Name of Ends and the
The connection of the two capacitor other ends, and it is negative to form output；The negative terminal of input DC power simultaneously with the first primary side winding different name end, first
The anode of diode is connected, and the first primary side winding Same Name of Ends is connected with the drain electrode of P-channel field-effect transistor (PEFT) pipe；The cathode of first diode
It is connected with the second primary side winding Same Name of Ends, the source electrode of P-channel field-effect transistor (PEFT) pipe connects the second primary side winding different name end, and tie point is simultaneously
Connect the anode of input DC power；The grid connection control signal of P-channel field-effect transistor (PEFT) pipe；It is characterized by: the first primary side around
Group and the second primary side winding are Double-wire parallel wound, and the first primary side winding and the second primary side winding both participate in excitation, further include the first electricity
Hold, one end of first capacitor is connected with the first primary side winding Same Name of Ends, and the other end of first capacitor and the second primary side winding are of the same name
End be connected, first capacitor for realizing inverse-excitation type switch power-supply filtering and decoupling.
4. a kind of inverse-excitation type switch power-supply, including a transformer, a P-channel field-effect transistor (PEFT) pipe, the second capacitor, first diode,
Two diodes, transformer include the first primary side winding, the second primary side winding and vice-side winding, vice-side winding different name end and the two or two
The connection of pole pipe anode, the second diode cathode connect with second capacitor one end, and is formed and exported just, vice-side winding Same Name of Ends and the
The connection of the two capacitor other ends, and it is negative to form output；The negative terminal of input DC power simultaneously with the drain electrode of P-channel field-effect transistor (PEFT) pipe, the
Two primary side winding Same Name of Ends are connected, and the source electrode of P-channel field-effect transistor (PEFT) pipe is connected with the first primary side winding different name end；Second primary side winding
Different name end is connected with the anode of first diode, and the first primary side winding Same Name of Ends is connected with the cathode of first diode, tie point
The anode of input DC power is connected simultaneously；The grid connection control signal of P-channel field-effect transistor (PEFT) pipe；It is characterized by: first is former
Side winding and the second primary side winding are Double-wire parallel wound, and the first primary side winding and the second primary side winding both participate in excitation, further include the
One capacitor, one end of first capacitor are connected with the first primary side winding different name end, the other end of first capacitor and the second primary side winding
Different name end be connected, first capacitor for realizing inverse-excitation type switch power-supply filtering and decoupling.
5. inverse-excitation type switch power-supply according to any one of claims 1 to 4, it is characterised in that: the first primary side winding and second
The line footpath of primary side winding is identical.
6. inverse-excitation type switch power-supply according to any one of claims 1 to 4, it is characterised in that: the second primary side winding passes through the
One capacitor participates in excitation.
7. inverse-excitation type switch power-supply according to any one of claims 1 to 4, it is characterised in that: when PCB layout the first primary side around
Group is contrary with the physical pathway of the excitation current of the second primary side winding.
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| CN201710142832.0A CN106655791B (en) | 2017-03-10 | 2017-03-10 | A kind of inverse-excitation type switch power-supply |
| PCT/CN2018/074968 WO2018161748A1 (en) | 2017-03-10 | 2018-02-01 | Flyback switching power supply |
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| CN201710142832.0A CN106655791B (en) | 2017-03-10 | 2017-03-10 | A kind of inverse-excitation type switch power-supply |
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| CN106655791B (en) * | 2017-03-10 | 2019-11-26 | 广州金升阳科技有限公司 | A kind of inverse-excitation type switch power-supply |
| CN107196516B (en) * | 2017-06-30 | 2020-02-14 | 广州金升阳科技有限公司 | Flyback switching power supply circuit |
| CN107196515A (en) * | 2017-06-30 | 2017-09-22 | 广州金升阳科技有限公司 | A kind of active clamp positive activation type switching power circuit |
| CN107294388B (en) * | 2017-06-30 | 2020-02-14 | 广州金升阳科技有限公司 | Flyback switching power supply |
| CN107276414B (en) * | 2017-06-30 | 2020-02-14 | 广州金升阳科技有限公司 | Active clamping flyback switching power supply circuit |
| CN107786094B (en) * | 2017-06-30 | 2020-11-06 | 广州金升阳科技有限公司 | Forward switching power supply |
| CN107994762A (en) * | 2017-11-21 | 2018-05-04 | 浙江万胜智能科技股份有限公司 | The lossless absorption circuit and Switching Power Supply of a kind of Switching Power Supply |
| CN116345919B (en) * | 2023-05-29 | 2023-08-04 | 江苏大秦新能源科技有限公司 | Double-circuit flyback DCDC auxiliary power supply with low cross adjustment rate and lossless absorption |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101572490A (en) * | 2009-06-15 | 2009-11-04 | 浙江大学 | Zero-voltage switch flyback-type DC-DC power supply conversion device |
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| US4268898A (en) * | 1980-03-20 | 1981-05-19 | Lorain Products Corporation | Semiconductor switching circuit with clamping and energy recovery features |
| US4365171A (en) * | 1980-12-23 | 1982-12-21 | General Electric Company | Low loss snubber circuit |
| US5844787A (en) * | 1997-09-29 | 1998-12-01 | Lucent Technologies, Inc. | Isolated flyback secondary inductor convertor |
| JP2004304962A (en) * | 2003-03-31 | 2004-10-28 | Sharp Corp | Snubber circuit and switching power unit mounting same |
| CN102111075A (en) * | 2011-03-04 | 2011-06-29 | 东南大学 | Voltage doubling rectifying push-pull normal shock converter |
| CN103078514A (en) * | 2013-01-05 | 2013-05-01 | 浙江大学 | Push-pull converter with voltage multiplying resonance capability |
| CN106655791B (en) * | 2017-03-10 | 2019-11-26 | 广州金升阳科技有限公司 | A kind of inverse-excitation type switch power-supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101572490A (en) * | 2009-06-15 | 2009-11-04 | 浙江大学 | Zero-voltage switch flyback-type DC-DC power supply conversion device |
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