CN202601388U - Self-excitation push-pull converter - Google Patents
Self-excitation push-pull converter Download PDFInfo
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- CN202601388U CN202601388U CN 201220207489 CN201220207489U CN202601388U CN 202601388 U CN202601388 U CN 202601388U CN 201220207489 CN201220207489 CN 201220207489 CN 201220207489 U CN201220207489 U CN 201220207489U CN 202601388 U CN202601388 U CN 202601388U
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Abstract
The utility model discloses a self-excitation push-pull converter. A transformer adopted by the converter is provided with a primary side power winding, a primary side feedback winding and a secondary side output winding, wherein the magnetic core of the transformer is a Rongling magnetic core; the secondary side output winding is wound on the thin part or the partial part of the Rongling magnetic core; and other transformer windings are wound on the thick part or the main part of the Rongling magnetic core. The self-excitation push-pull converter can overcome existing defects of a conventional self-excitation push-pull converter, and does not add a resistor as a dummy load, so that when the self-excitation push-pull converter is in zero load, the output voltage of the self-excitation push-pull converter is boosted by less than 20 percent, ripple voltage of the output voltage is reduced, and EMI (Electro-Magnetic Interference) ado of the output end is lowered.
Description
Technical field
The utility model relates to this type power module of self-excitation push-pull converter.
Background technology
Existing self-excitation push-pull converter; Circuit structure is from the self-oscillation push-pull transistor single phase transformer DC converter of nineteen fifty-five U.S. Luo Ye (G.H.Royer) invention; Also make the Royer circuit; This also is the beginning of realizing the high frequency conversion control circuit, and the related work principle of self-excitation push-pull converter has description in " principle of Switching Power Supply and the design " the 67th page to 70 pages of Electronic Industry Press, this book ISBN 7-121-00211-6.The principal mode of circuit is above-mentioned famous Royer circuit.
Shown in Fig. 1 is the common application of self-excitation push-pull converter; Circuit structure is the Royer circuit, and in Fig. 1, circuit all will utilize the magnetic core saturation characteristic of transformer B1 to vibrate; Its operation principle has description for the 70th page in above-mentioned " principle of Switching Power Supply and design "; Understanding its operation principle for ease, is example with Fig. 1 here, and its operation principle is described.
The circuit structure of Fig. 1 is: input filter capacitor C2 is connected between the input and ground GND of operating voltage Vin, and input voltage is carried out filtering; Filtered input voltage inserts start-up circuit, and start-up circuit is composed in parallel by biasing resistor R1 and capacitor C 1; The two ends of biasing resistor R1 respectively with voltage input end and transformer B1 primary coil N
B1And N
B2Centre cap connect primary coil N
B1And N
B2Be two recommend triode TR1, the TR2 base stage provides the positive feedback drive signal; Two emitters of recommending triode TR1, TR2 altogether, two collector electrodes connect transformer primary coil N respectively
P1And N
P2Two terminations, base stage connects transformer primary coil N
B1And N
B2Two terminations; Primary coil N
P1And N
P2In centre cap connect voltage input end; The secondary coil N of transformer B1
SConnect output circuit to voltage output end.Output circuit is known full-wave rectifying circuit, is made up of diode D1 and diode D2 and output filter capacitor C3, and the direct voltage of output is the output of DC out position in Fig. 1.
The summary of its operation principle is: referring to Fig. 1, energized moment, coil N is passed through in biasing resistor R1 and capacitor C 1 shunt circuit
B1And N
B2Winding is that base stage, the emitter of triode TR1 and TR2 provides forward bias; Two triode TR1 and TR2 begin conducting; Because two triode characteristics can not be just the same; Therefore, wherein triode can first conducting (or its collector current greater than the collector current of another triode, analytical method is identical).Suppose the conducting of triode TR2 elder generation, produce collector current I
C2, the coil N that it is corresponding
P2The voltage of winding is last negative just down, according to end relation of the same name, its base winding N
B2Negative just down induced voltage also appears in winding, and this voltage has increased the base current of triode TR2, and this is the process of a positive feedback, thereby makes triode TR2 saturation conduction very soon; Correspondingly, the corresponding coil N of triode TR1
B1The voltage of winding is last negative just down, and this voltage has reduced the base current of triode TR1, and triode TR1 ends soon fully very much.Base winding N
B2Winding is called feedback winding N again
B2
The coil N that triode TR2 is corresponding
P2Electric current in the winding, and the magnetic flux density that produces of this electric current is in time and linear increasing, but magnetic flux density be increased near or reach the saturation point B of transformer B1 magnetic core
mThe time, coil N
P2Inductance value reduce rapidly, thereby the collector current of triode TR2 is sharply increased, the speed of increase is much larger than the increase of base current, triode TR2 breaks away from saturated, the collector electrode of triode TR2 is to the pressure drop U of emitter
CEIncrease, correspondingly, transformer N
P2Voltage on the winding just reduces same numerical value, coil N
B2The voltage of winding induction reduces, and the result also reduces triode TR2 base voltage, causes triode TR2 to changing by direction; At this moment, the voltage on the transformer B1 coil will be reverse, make another triode TR1 conducting; After this, repeat this process, form push-pull oscillator.
The waveform of the output of winding Ns is as shown in Figure 2, and is visible, and except " collection utmost point mode of resonance Royer circuit " sine wave output or near sinusoidal ripple, the work wave of self-excitation push-pull converter is near square wave.Collection utmost point mode of resonance Royer circuit is claimed " CCFL inverter (CCFL inverter) " again; Also can abbreviate CCFL inverter or CCFL converter as; The CCFL converter seals in ten times of inductance more than the inductance value of main power winding at current supply circuit, to obtain sine wave output or near sinusoidal ripple.Fig. 3 is the square magnetic hysteresis loop of transformer B1 magnetic core, wherein+and B
m,-B
mFor two saturation point of magnetic core, in the half period of Fig. 2, the route of the working point of transformer B1 magnetic core motion is ABCDE, and moving line is EFGHA in following half period.In fact; Electric current in the corresponding coil windings of triode TR2 or TR1, and the magnetic flux density that produces of this electric current is in time and linearity when being increased among Fig. 3 D point or H point, circuit will be recommended conversion; Be the conducting of another triode, and corresponding triode can be tending towards ending.Because there is a memory time (storage time) in triode; Be that transistor base receives cut-off signals; And the collector current short time of will delaying time just begins to descend up to shutoff, can be created in memory time among Fig. 3, and magnetic core working point moving line is mobile to the E point from D point; Accordingly, or magnetic core working point moving line move to the A point from the H point.
If magnetic core working point moving line to the E point moves, sharply increases to i corresponding to the collector current of above-mentioned triode TR2 from the D point
C2(lowercase, capitalization subscript, expression contains the instant value of direct current), because the magnetic core of transformer B1 is near saturation point, the inductance value on the magnetic core of transformer B1 seriously descends, the collector current of triode TR2 sharply increases to i
C2After, triode TR2 at once is in off state again then, and according to known theory, the electric current in the inductance can not suddenly change, so when the D point, the collector current i of triode TR2
C2, can only discharge with the anti-form that swashs (Fly-back), form the spike of 41 indications among Fig. 2; Because the magnetic core of transformer B1 is near magnetic saturation, the collector current i of triode TR2
C2Portion of energy appears in the magnetic core of transformer B1 with the heat energy form.
The magnetic core that among Fig. 2 40,41,42 is transformer B1 occurs that magnetic saturation produces instead swashs peak voltage, and 41 to be example, 40 analytical method is similar.Collector current i as triode TR2
C2When triode TR2 turn-offs, discharge with the anti-form that swashs (Flyback), behind 41 the spike, when and then being triode TR1 saturation conduction, 43 waveforms of normal shock output, the voltage of 43 waveforms meet the turn ratio relation of transformer fully among formation Fig. 2.
Just because of this, this just brings the shortcoming of self-excitation push-pull converter Royer circuit, referring to Fig. 1, as the collector current i of triode TR2
C2Before triode TR2 turn-offed, according to end relation of the same name, the output of circuit was diode D1 conducting, exported to C3 to the voltage that normal shock produces again to output DC out, and this is a voltage signal; Collector current i as triode TR2
C2Instantaneous in triode TR2 shutoff, according to known theory, the electric current in the inductance can not suddenly change, the collector current i of triode TR2
C2, can only discharge i with the anti-form that swashs
C2The primary current direction be the other end that flows to no stain from the end of the same name that stain is arranged; Identical with the direction of arrow unique among Fig. 1; This electric current can occur at other winding through the magnetic core of transformer B1; In secondary winding Ns, secondary winding N the other end of no stain appears flowing to from the end of the same name that stain is arranged, promptly
S1And N
S2In electric current from top to bottom all appears, diode D1 is because anti-conducting partially and not, and diode D2 is because positively biased and conducting, the collector current i of triode TR2
C2Through anti-sharp mode, obtain afterflow at output, this is the electric current output mode, and output voltage is relevant with load, and load is little, and output voltage will be very high.
With one group of this situation of measured data explanation, adopt and the same circuit of Fig. 1 below, make input direct current 5V; Output direct current 5V, output current is the converter of 200mA, i.e. power output 1W; Comprise transformer B1, magnetic core adopts external diameter 5.1mm, internal diameter 2.3mm; Highly be 1.7mm, material adopts the P46 magnetic material of peak electronic material limited company more.
The parameter of other circuit: resistance R 1 is 1K Ω; Capacitor C 2 is the patch capacitor of 1uF/6.3V, and capacitor C 3 is the patch capacitor of 2.2uF/6.3V, and capacitor C 1 is the 0.047uF/6.3V patch capacitor; Triode TR1 and TR2 are the switch triode of multiplication factor about 200 times, and its collector electrode maximum operating currenbt is 1A, has selected the FMMT491 triode here for use; Diode D1 and D2 are the Schottky Rectifier of RB160, wherein, and former limit power winding N
P1And N
P2The number of turns be respectively 7 circles, former limit feedback winding N
B1And N
B2The number of turns be respectively 2 circles, secondary output winding N
S1And N
S2The number of turns be respectively 8 circles.
The circuit of Fig. 1, use that the prior art actual measurement is unloaded in output, semi-load (output 5V, 100mA), fully loaded (output 5V, the data under 200mA) are seen table one:
Table one
Fig. 2 be this circuit when zero load, the anode of test diode D1 is to secondary output winding N
S1And N
S2Centre tapped voltage waveform.
It is thus clear that when circuit during in zero load, output voltage rises very high; Make troubles for the design of subsequent conditioning circuit, and the anti-sharp ripple that produces is bigger, needs bigger filter capacitor usually; Generally require when zero load output voltage to rise and be no more than 20%, promptly 6V has reached 98.8% and rise in this example.
Under the situation of semi-load, we have tested the ripple voltage of output DC out, and oscilloscope places and exchanges input; Actual measurement ripple voltage waveform is as shown in Figure 4; The peak of ripple voltage-peak value is 20.6mV, and its main source is exactly the anti-spike 44 that causes that swashs, and only marks preceding 3 among the figure; The back also be not mark.Because frequency is high, general filter capacitor is difficult to be absorbed, and the ESR under high-frequency requires very high to filter capacitor.The frequency of Fig. 2 is unloaded 272.3KHz, and the ripple voltage frequency after the full-wave rectification should be its frequency multiplication 544KHz, is that 100Hz is the same as the ripple behind the 50Hz AC rectification.Fig. 4 is test semi-load, and operating frequency can reduce, and its actual operating frequency is 512.7/2=256.3KHz.
Common way is in Fig. 1 circuit, and resistance of parallel connection serves as dummy load on the capacitor C 3, consumes certain electric current; Make converter output voltage when " zero load " unlikely too much; But the resistance that parallel connection is got on has reduced the efficient of converter, and in industrial circle, the micromodule that a large amount of Royer circuit that use are made; Increase by one 0402 Chip-R, all become stubborn problem in the design.
In sum, there is following shortcoming in existing self-excitation push-pull converter Royer circuit:
1, circuit is when zero load, because instead swash reason, output voltage rises higher.
2, output ripple is bigger because of anti-sharp the existence.
3, above-mentioned reason, the EMI of output (Electro Magnetic Interference) harassing and wrecking are also bigger.
For the technical scheme of clearer explanation the utility model, to make an explanation in the face of disclosed a kind of special magnetic core in the prior art down, this special magnetic core is found in two China's application for a patent for invention prospectus, is respectively:
Application number: 201110436359, open day is in " a kind of magnetic core for transformer " on May 2nd, 2012; A kind of magnetic core for transformer; It is characterized in that: described magnetic core is made up of with thin portion the thick portion of closure; Described thin portion reaches magnetic saturation earlier than described thick portion under identical ascending magnetic field excitation; Described thin portion is in when work, only moment near or reach described thin portion first quartile saturation point or third quadrant saturation point, At All Other Times all between described thin portion intrinsic first quartile saturation point and third quadrant saturation point;
And application number: 201110436259; Open day is in " a kind of self-excitation push-pull converter " on May 2nd, 2012; The closed core of described transformer or unshakable in one's determination by principal part and local the composition, described part reaches magnetic saturation earlier than described principal part under identical ascending magnetic field excitation.
In fact; Above-mentioned two disclosed closed cores of patent application are identical with magnetic core for transformer in essence, and because in actual production, these two kinds of magnetic cores are the defending party to the application and inventor's called after " Rong Ling magnetic core " or " Rong Ling magnetic core "; So in this article; For convenient narration technical scheme,, be referred to as: the Rong Ling magnetic core for this special magnetic core that meets definition.
Summary of the invention
The purpose of the utility model provides a kind of self-excitation push-pull converter; Can overcome the shortcoming that existing self-excitation push-pull converter exists; Do not increase resistance as dummy load, make the self-excitation push-pull converter when zero load, the output voltage of self-excitation push-pull converter rises in 20%; Reduce the ripple voltage in the output voltage simultaneously, reduce the EMI harassing and wrecking of output.
The purpose of the utility model realizes through following technical measures:
A kind of self-excitation push-pull converter; Comprise transformer; Said transformer is provided with former limit power winding, former limit feedback winding and secondary output winding, and the magnetic core of said transformer is the Rong Ling magnetic core; Said secondary output winding technique is in the thin portion or part of Rong Ling magnetic core, and remaining Transformer Winding is wound in the thick portion or principal part of Rong Ling magnetic core.
As a kind of execution mode of utility model, the thin portion of said Rong Ling magnetic core or local material can be consistent with the thick portion of said Rong Ling magnetic core or the material of principal part.
As a kind of execution mode of utility model, the thin portion of said Rong Ling magnetic core or local material can be different with the thick portion of said Rong Ling magnetic core or the material of principal part.
The said secondary output of utility model winding is provided with first secondary coil and second secondary coil that is used to export reverse voltage that is used to export forward voltage; The tie point of said first secondary coil and second secondary coil is the centre cap of secondary output winding, described self-excitation push-pull converter output all-wave signal.
The operation principle of the utility model does; The self-excitation push-pull converter of technique scheme; Royer circuit with Fig. 1 is an example; Transformer B1 in Fig. 1 self-excitation push-pull converter adopts the technical scheme of above-mentioned the utility model, and the symmetrical operation principle of circuit does not change, and directly describes emphasis here:
When the collector current of triode TR2 increased to certain value among Fig. 1, the thin portion of the Rong Ling magnetic core of transformer B1 or part were near saturation point, and the inductance value on the magnetic core of transformer B1 can descend, and the collector current of triode TR2 sharply increases to i
C2After, triode TR2 is in off state again then at once, and according to known theory, the electric current in the inductance can not suddenly change, the collector current i of triode TR2
C2, can only discharge with the anti-form that swashs, now in the technology; Secondary output forms the peak voltage waveform of 40,41,42 indications among Fig. 2; But because the secondary of the utility model is exported winding technique in the thin portion or part of Rong Ling magnetic core, the thin portion of Rong Ling magnetic core or local interior have reached saturation point at the moment, and secondary of coiling output winding electric sensibility reciprocal seriously descends on it; The anti-sharp electric current (or voltage) that produces is very little; Even do not have fully, this is because after reaching saturation point, inner magnetic flux can't further increase and determined; Note former limit power winding because be wound in the thick portion or principal part of Rong Ling magnetic core, instead swash the electric current that produces and to appear at another winding in former limit feedback winding, the former limit power winding or appear in the Rong Ling magnetic core of transformer B1 with the heat energy form.
Compared with prior art, the utlity model has following significant effect:
Realized the self-excitation push-pull converter in recommending transfer process, circuit is when zero load, and output voltage rises in 20%; Owing to having eliminated because of the anti-sharp spike that occurs, output ripple significantly reduces, and is below half of prior art; The EMI harassing and wrecking of output also decline to a great extent, and are below half of prior art.
Because output ripple is little, can adopt less output filter capacitor, has reduced cost.
Description of drawings
Fig. 1 is the common application circuit of self-excitation push-pull converter Royer circuit;
Fig. 2 is the oscillogram of output of the Royer circuit winding Ns of Fig. 1;
Fig. 3 is the square magnetic hysteresis loop of transformer B1 magnetic core in the Royer circuit of Fig. 1;
Fig. 4 is the oscillogram of the Royer circuit output end ripple voltage of Fig. 1;
Fig. 5 is the Rong Ling core const ruction sketch map that embodiment one adopts;
Fig. 6 is the thin portion position sketch map of the Rong Ling magnetic core of embodiment one employing;
Fig. 7 is embodiment one circuit theory diagrams and coiling position view;
Fig. 8 is winding N among the embodiment one
S1The oscillogram of output signal;
Fig. 9 is that embodiment one surveys comparison diagram with the former limit feedback winding of prior art;
Figure 10 is the circuit theory diagrams that embodiment two adopts;
Figure 11 is the Rong Ling core const ruction sketch map that embodiment two adopts.
Embodiment
Embodiment one
Embodiment one adopts and the same circuit topology of Fig. 1; Make input direct current 5V, output direct current 5V, output current is the converter of 200mA; Be power output 1W; Comprise transformer B1, its annexation is: described transformer B1 is made up of Rong Ling magnetic core 55 and respective coil winding, and coil windings comprises former limit power winding N
P1And N
P2, former limit feedback winding N
B1And N
B2, secondary output winding N
S1And N
S2Described secondary output winding N
S1And N
S2Be wound in the thin portion of Rong Ling magnetic core, promptly on the shadow region 56 in Fig. 6.
Rong Ling magnetic core 55 structural representations adopt external diameter 5.1mm, internal diameter 2.3mm referring to Fig. 5; Highly be 1.7mm; The wide 1.75mm of the thin portion of Rong Ling magnetic core (claiming local again), the thin portion the thinnest thickness in place is 0.88mm, material adopts the P46 magnetic material of peak electronic material limited company more.
The parameter of other circuit: resistance R 1 is 1K Ω; Capacitor C 2 is the patch capacitor of 1uF/6.3V, and capacitor C 3 is the patch capacitor of 2.2uF/6.3V, and capacitor C 1 is the 0.047uF/6.3V patch capacitor; Triode TR1 and TR2 are the switch triode of multiplication factor about 200 times, and its collector electrode maximum operating currenbt is 1A, has selected the FMMT491 triode here for use; Diode D1 and D2 are the Schottky Rectifier of RB160, wherein, and former limit power winding N
P1And N
P2The number of turns be respectively 7 circles, former limit feedback winding N
B1And N
B2The number of turns be respectively 2 circles, secondary output winding N
S1And N
S2The number of turns be respectively 8 circles.
Fig. 7 adopts gimmick commonly used in the early stage radio books, shows the circuit theory diagrams and coiling position view of embodiment one, is called installation diagram again.
For the effect of illustrative embodiment one, the self-excitation push-pull converter of the prior art of contrast usefulness adopts identical circuit parameter, i.e. electric parameter in the background technology, and measured performance such as table two:
Table two
It is thus clear that when load was unloaded, output voltage was 5.634V, compare with fully loaded output voltage, risen 12.8%, be lower than require in the technical scheme 20%, realized the beneficial effect of technical scheme.
Fig. 8 is embodiment one when output is unloaded, with the anode of Tyke TDS-3012C digital fluorescence oscilloscope test diode D1 secondary is exported winding N
S1And N
S2Centre tapped voltage waveform.Comparing with Fig. 2 of prior art, is not have the anti-peak voltage that causes that swashs fully, and this has proved that also the operation principle in the technical scheme is correct.
With Tyke TDS-3012C digital fluorescence oscilloscope output ripple is measured; Oscilloscope places and exchanges input; Actual measurement ripple voltage peak-peak value is only less than 6mV, because ripple voltage is less, the minimum shelves of Tyke TDS-3012C digital fluorescence oscilloscope are 1mV; Because shielding house is not used in test, whether the voltage that can't confirm 6mV disturbs and causes.Here, the inventor adjusts output filter capacitor in the circuit among the embodiment one, and capacitor C 3 is by the patch capacitor of original 2.2uF/6.3V; The reduction capacity is to 0.47uF/6.3V, i.e. 474/6.3V, and at this moment oscilloscope can comparatively clearly be truncated to the waveform of output ripple; See Fig. 9, the contrast prior art Fig. 4 can see, the output filter capacitor of embodiment one be prior art below 1/4th; Its output ripple is merely 20.2mV, still is superior to the 20.6mV of prior art among Fig. 4, and the ripple step among Fig. 4 is big; Its Harmonic Interference is big, and the ripple of embodiment one is approaching sinusoidal wave, and its harmonic wave composition is little; The EMI harassing and wrecking of output also decline to a great extent, and have realized the beneficial effect in the technical scheme.
Another kind of Rong Ling magnetic core adopts unlike material to make a magnetic core, can realize goal of the invention equally, and the principal part of this Rong Ling magnetic core is equivalent to the thick portion of present embodiment, and the part is equivalent to the thin portion of present embodiment, and embodiment two will show this annexation.
Embodiment two
Embodiment two adopts the circuit of Figure 10; Different with Fig. 1 is; Capacitor C 1 is original parallelly connected with resistance R 1; When input voltage vin was higher, capacitor C 1 existed and impacts recommending base stage, emitter with switch triode in when start, Figure 10 solved among Fig. 1 capacitor C 1 when starting shooting to recommending impact with switch triode.Make input direct current 15V, output direct current 5V, output current is the converter of 200mA; Be power output 1W; Comprise transformer B1, its annexation is: described transformer B1 is made up of Rong Ling magnetic core 57 and respective coil winding, and coil windings comprises former limit power winding N
P1And N
P2, former limit feedback winding N
B1And N
B2, secondary output winding N
S1And N
S2Described secondary output winding N
S1And N
S2Be wound on the part of Rong Ling magnetic core, promptly in Figure 11 58 on.
Rong Ling magnetic core 57 structural representations adopt external diameter 5.1mm, internal diameter 2.3mm referring to Figure 11; Highly be 1.7mm; The material of the part 58 of Rong Ling magnetic core adopts the A10 magnetic material of peak electronic material limited company more, and its initial permeability μ i is 10000, and the material of principal part (part among Figure 11 beyond the shade 58) adopts the P46 magnetic material of peak electronic material limited company more; Its initial permeability μ i is about 3300, and sintering forms at twice.
The parameter of other circuit: resistance R 1 is 3.6K Ω; Capacitor C 2, capacitor C 3 are the patch capacitor of 1uF/16V, and capacitor C 1 is the 0.047uF/10V patch capacitor; Triode TR1 and TR2 are the switch triode of multiplication factor about 200 times, and its collector electrode maximum operating currenbt is 1A, has selected the FMMT493 triode here for use; Diode D1 and D2 are the Schottky Rectifier of RB160, wherein, and former limit power winding N
P1And N
P2The number of turns be respectively 16 circles, former limit feedback winding N
B1And N
B2The number of turns be respectively 3 circles, secondary output winding N
S1And N
S2The number of turns be respectively 6 circles.
Effect for illustrative embodiment two; The self-excitation push-pull converter of the prior art of contrast usefulness adopts identical circuit parameter, and different is that the material of magnetic core all adopts the P46 magnetic material of peak electronic material limited company more; Do not exist principal part with local, measured performance such as table three:
Table three
It is thus clear that when load was unloaded, output voltage was 5.669V, compare with fully loaded output voltage, risen 13.2%, be lower than require in the technical scheme 20%, realized the beneficial effect of technical scheme.
Embodiment two exports winding N with the anode of Tyke TDS-3012C digital fluorescence oscilloscope test diode D1 to secondary when output is unloaded
S1And N
S2Centre tapped voltage waveform, be not have the anti-peak voltage that causes that swashs fully, this has proved that also the operation principle in the technical scheme is correct.Since similar with Fig. 8, the sectional drawing explanation do not had here.
With Tyke TDS-3012C digital fluorescence oscilloscope output ripple is measured; Oscilloscope places and exchanges input, and actual measurement ripple voltage peak-peak value is only less than 30mV, because similar with Fig. 9; Here do not have the sectional drawing explanation, the output ripple of the prior art of identical filter capacitor is 76mV.It is thus clear that embodiment two has realized the beneficial effect in the technical scheme equally.
Only be the preferred implementation of the utility model below, should be pointed out that above-mentioned preferred implementation should not be regarded as the restriction to the utility model, the protection range of the utility model should be as the criterion with claim institute restricted portion.For those skilled in the art, in spirit that does not break away from the utility model and scope, can also make some improvement and retouching, these improvement and retouching also should be regarded as the protection range of the utility model.As former limit feedback winding simultaneously also around the thin portion or the part of Rong Ling magnetic core, to obtain the small lifting of efficient; As thin portion or the part of the driving winding of self-driving type synchronous rectification, can promote the conversion efficiency of self-excitation push-pull converter equally around the Rong Ling magnetic core.
Claims (4)
1. self-excitation push-pull converter; Comprise transformer; Said transformer is provided with former limit power winding, former limit feedback winding and secondary output winding, and it is characterized in that: the magnetic core of said transformer is the Rong Ling magnetic core; Said secondary output winding technique is in the thin portion or part of Rong Ling magnetic core, and remaining Transformer Winding is wound in the thick portion or principal part of Rong Ling magnetic core.
2. self-excitation push-pull converter according to claim 1 is characterized in that: the material of the thin portion of said Rong Ling magnetic core or part is consistent with the material of the thick portion of said Rong Ling magnetic core or principal part.
3. self-excitation push-pull converter according to claim 1 is characterized in that: the material of the thin portion of said Rong Ling magnetic core or part is different with the material of the thick portion of said Rong Ling magnetic core or principal part.
4. according to each described self-excitation push-pull converter of claim 1 to 3; It is characterized in that: said secondary output winding is provided with first secondary coil and second secondary coil that is used to export reverse voltage that is used to export forward voltage; The tie point of said first secondary coil and second secondary coil is the centre cap of secondary output winding, described self-excitation push-pull converter output all-wave signal.
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2012
- 2012-05-09 CN CN 201220207489 patent/CN202601388U/en not_active Expired - Lifetime
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| CN108832714A (en) * | 2016-07-27 | 2018-11-16 | 国网江苏省电力公司常州供电公司 | A kind of active power distribution network intelligent terminal battery isolation monitoring device |
| WO2020119408A1 (en) * | 2018-12-14 | 2020-06-18 | 广州金升阳科技有限公司 | Power supply circuit and photovoltaic power generation system comprising same |
| US11362598B2 (en) | 2018-12-14 | 2022-06-14 | Mornsun Guangzhou Science & Technology Co., Ltd. | Power supply circuit and photovoltaic power generation system comprising same |
| CN110838795A (en) * | 2019-11-27 | 2020-02-25 | 广州捷拓电子有限公司 | Self-excitation push-pull type converter capable of realizing short-circuit protection and short-circuit protection method |
| CN112865335A (en) * | 2021-01-15 | 2021-05-28 | 中国南方电网有限责任公司超高压输电公司天生桥局 | Wireless power transmission circuit suitable for cross energy taking |
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