CN101047338A - Synchronous rectificiation circuit of DC/DC inverter - Google Patents
Synchronous rectificiation circuit of DC/DC inverter Download PDFInfo
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- CN101047338A CN101047338A CNA2007100742694A CN200710074269A CN101047338A CN 101047338 A CN101047338 A CN 101047338A CN A2007100742694 A CNA2007100742694 A CN A2007100742694A CN 200710074269 A CN200710074269 A CN 200710074269A CN 101047338 A CN101047338 A CN 101047338A
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Abstract
A synchronous rectification circuit of DC/DC converter is prepared as controlling negative clamping-driving circuit by negative clamping component of secondary edge winding on transformer at DC/DC converter, using said clamping component to discharge electricity onto rectification tube/follow current tube and clamping rectification tube/follow current tube on a low level, setting a capacity on negative clamping-driving circuit and electric-connecting one end of said capacity to said secondary edge winding and another end of said capacity to control end of said clamping component.
Description
Technical field
The present invention relates to the DC/DC converter, relate in particular to a kind of circuit of synchronous rectification of DC/DC converter.
Background technology
Synchronous rectification is the key technology that realizes high power density DC/DC converter, adopts synchronous rectification MOS transistor (MOSFET) to replace Schottky (Schottky) diode to carry out rectification at the secondary of converter, can reduce conduction loss greatly.But synchronous rectification MOS transistor gate pole needs corresponding drive circuit to have relatively high expectations, because the MOS transistor grid oxic horizon is to be made of as thin as a wafer SiO2 layer, if gate source voltage Vgs (comprising back bias voltage) surpasses its maximum gate source puncture voltage, then device may permanent failure.Therefore the driving of synchronous rectifier adopts hooping position driving circuit to suppress too high driving voltage to guarantee the reliably working of synchronous rectifier more.
Fig. 1 is the schematic diagram of the direct drive circuit of single-end ortho-exciting control in the prior art.The change in voltage scope that is provided by the driving winding is bigger, and positive negative direction all very likely surpasses the grid source rated insulation voltage of Q4, so need the clamp pressure limiting.
Application number is to have disclosed the another kind of improvement project of Direct/Reverse hooping position driving circuit that has in 200510101274.0 the Chinese invention patent.As shown in Figure 2, though this circuit is clamped to positive level Vp and ground level with synchronous rectifier Q4 driving voltage.But this circuit has a defective: in order to make the complete conducting of synchronous rectifier Q4, the positive drive voltage of Transformer Winding W3 must be higher, correspondingly, winding W3 negative drive voltage is also very high, add the influence of transformer leakage inductance, drive waveforms unavoidably has certain peak voltage, and the gate source voltage of negative clamping metal-oxide-semiconductor Q6 probably surpasses its rated insulation voltage, cause negative clamping pipe Q6 to damage, and then cause synchronous rectifier Q4 to damage.
Summary of the invention
Technical problem to be solved by this invention is: overcome the defective of prior art, propose a kind of circuit of synchronous rectification of DC/DC converter, prevent the negative clamping device failure.
Technical problem of the present invention is solved by following technical scheme:
A kind of circuit of synchronous rectification of DC/DC converter, comprise rectifying tube, continued flow tube and negative clamping drive circuit, described negative clamping drive circuit comprises the negative clamping device of the transformer secondary winding that is controlled by described DC/DC converter, described negative clamping device is used for being clamped to a low level to the discharge of rectifying tube and/or continued flow tube and with rectifying tube and/or continued flow tube, it is characterized in that: the negative clamping drive circuit comprises electric capacity, described electric capacity one end connects with the transformer secondary winding electric of described DC/DC converter, and the other end links to each other with the control end of described negative clamping device.
Technical problem of the present invention is further solved by following technical scheme:
Also comprise first resistance, described electric capacity links to each other with the transformer secondary winding of described DC/DC converter by first resistance.
Also comprise second resistance, described second resistance is connected in parallel on the two ends of electric capacity.
Also comprise and be used for the charging of rectifying tube and/or continued flow tube and rectifying tube and/or continued flow tube be clamped to the positive clamping circuit of a high level, described positive clamping circuit comprises positive clamping switching tube, source of stable pressure, the drain electrode of described positive clamping switching tube connects with transformer secondary winding electric, grid links to each other with source of stable pressure is anodal, and source electrode links to each other with the control end of described rectifying tube and/or continued flow tube.
The transformer secondary of described DC/DC converter comprises that the secondary main winding, the continued flow tube that are connected in series drive winding, rectifying tube drives winding; Described rectifying tube is first nmos pass transistor, and described continued flow tube is second nmos pass transistor, and described negative clamping device is the PMOS transistor; The end of the same name that the grid of described first nmos pass transistor and rectifying tube drive winding electrically connects, and source electrode links to each other with the different name end that rectifying tube drives winding, and drain electrode links to each other with the drain electrode of second nmos pass transistor; The transistorized grid of described PMOS electrically connects by the different name end that electric capacity and continued flow tube drive winding, and source electrode links to each other with the grid of second nmos pass transistor, and drain electrode links to each other with the negative pole of source of stable pressure, the source electrode of second nmos pass transistor and the different name end of secondary main winding; The source electrode of described positive clamping switching tube links to each other with the grid of described second nmos pass transistor, and drain electrode links to each other with the different name end that continued flow tube drives winding by first diode.
The transformer secondary of described DC/DC converter comprises that the secondary main winding and the continued flow tube that are connected in series drive winding; Described rectifying tube is first nmos pass transistor, and described continued flow tube is second nmos pass transistor, and described negative clamping device is the PMOS transistor; The drain electrode of described first nmos pass transistor links to each other with the different name end of secondary main winding, and the negative pole of the source electrode of source electrode and second nmos pass transistor, PMOS transistor drain, source of stable pressure links to each other, and the end of the same name of grid and secondary main winding electrically connects; The transistorized grid of described PMOS electrically connects by the different name end that electric capacity and continued flow tube drive winding, source electrode links to each other with the grid of second nmos pass transistor, the source electrode of described positive clamping switching tube links to each other with the grid of described second nmos pass transistor, and drain electrode links to each other with the different name end that continued flow tube drives winding by second diode.
The transformer secondary of described DC/DC converter comprises that the secondary main winding, the continued flow tube that are connected in series drive winding; Described rectifying tube is first nmos pass transistor, and described continued flow tube is second nmos pass transistor, and described negative clamping device is a diode; The end of the same name of the grid of described first nmos pass transistor and secondary main winding electrically connects, and drain electrode links to each other with the different name end of secondary main winding, and source electrode links to each other with the source electrode of second nmos pass transistor, the anode of diode and the negative pole of source of stable pressure; The negative electrode of described diode links to each other with drain electrode, the electric capacity of positive clamping switching tube, and the source electrode of described positive clamping switching tube links to each other with the grid of described second nmos pass transistor, and drain electrode electrically connects by the different name end that electric capacity and continued flow tube drive winding.
The transformer secondary of described DC/DC converter comprises that the secondary main winding, the continued flow tube that are connected in series drive winding; Described rectifying tube is first nmos pass transistor, and described continued flow tube is second nmos pass transistor, and described negative clamping device is a diode; The end of the same name of the grid of described first nmos pass transistor and secondary main winding electrically connects, and drain electrode links to each other with the different name end of secondary main winding, and source electrode links to each other with the source electrode of second nmos pass transistor, the anode of diode; The negative electrode of described diode links to each other with grid, the electric capacity of second nmos pass transistor, and the different name end that described electric capacity and continued flow tube drive winding electrically connects.
The transformer secondary of described DC/DC converter comprises that the secondary main winding, the continued flow tube that are connected in series drive winding, rectifying tube drives winding; Described rectifying tube is first nmos pass transistor, and described continued flow tube is second nmos pass transistor, and described negative clamping device is the PMOS transistor; The different name end that the grid of described second nmos pass transistor and continued flow tube drive winding electrically connects, and source electrode links to each other with the different name end of secondary main winding, and drain electrode links to each other with the drain electrode of first nmos pass transistor; The source electrode of described positive clamping switching tube links to each other with the grid of described first nmos pass transistor, and drain electrode links to each other with the end of the same name that rectifying tube drives winding by first diode; The transistorized grid of described PMOS electrically connects by the end of the same name that electric capacity and rectifying tube drive winding, source electrode links to each other with the grid of first nmos pass transistor, and drain electrode links to each other with the different name end that rectifying tube drives winding with the negative pole of source of stable pressure, the source electrode of first nmos pass transistor.
The beneficial effect that the present invention is compared with the prior art is:
Because the transformer secondary winding driving voltage of existing DC/DC converter generally is an asymmetric positive negative sense level, the negative sense value is generally a lot of greatly than forward value, make the negative clamping tube device surpass maximum tolerance easily and damage, the present invention is provided with electric capacity at the negative clamping drive circuit, the one end connects with transformer secondary winding electric, and its other end links to each other with the control end of negative clamping device.Can limit voltage or electric current on the negative clamping device like this, avoid burning the negative clamping device, thereby guarantee the operate as normal of circuit.Particularly, at the situation that adopts the PMOS transistor as the negative clamping device, electric capacity can be with the winding voltage phase shift up and down weber balance drive level, reduced the negative voltage value greatly, can prevent effectively that the transistorized gate source voltage of PMOS from exceeding standard, and prevents the PMOS transistor damage as the negative clamping device; At the situation that adopts diode as the negative clamping device, electric capacity can increase the impedance in diode loop of living in, avoids forming very big circulation, prevents to burn the diode as the negative clamping device.
The present invention links to each other by first resistance above-mentioned electric capacity with the transformer secondary winding of described DC/DC converter; utilize first resistance to absorb a part of peak voltage; again by the negative clamping device; further protection negative clamping device further overcomes the defective that prior art negative clamping device damages easily.
The present invention can regulate the waveform of above-mentioned electric capacity by second resistance being connected in parallel on the two ends of electric capacity, the drive control voltage of fine setting negative clamping device.
Description of drawings
Fig. 1 is the circuit of synchronous rectification structure principle chart of existing band positive clamping drive circuit;
Fig. 2 is existing circuit of synchronous rectification structure principle chart with forward and reverse hooping position driving circuit;
Fig. 3 is the circuit of synchronous rectification structure principle chart of the specific embodiment of the invention one;
Fig. 4 is that the transformer secondary of DC/DC converter drives the winding voltage oscillogram;
Fig. 5 is the negative clamping switching tube gate source voltage oscillogram of existing circuit of synchronous rectification;
Fig. 6 is the negative clamping switching tube gate source voltage oscillogram of the specific embodiment of the invention one;
Fig. 7 is the negative clamping switching tube drain-source voltage oscillogram of the specific embodiment of the invention one;
Fig. 8 is the continued flow switch pipe driving voltage waveform figure of the specific embodiment of the invention one;
Fig. 9 is the circuit of synchronous rectification structure principle chart of the specific embodiment of the invention two;
Figure 10 is the circuit of synchronous rectification structure principle chart of the specific embodiment of the invention three;
Figure 11 is the circuit of synchronous rectification structure principle chart of the specific embodiment of the invention four;
Figure 12 is the circuit of synchronous rectification structure principle chart of the specific embodiment of the invention five;
Figure 13 is the circuit of synchronous rectification structure principle chart of the specific embodiment of the invention six.
Embodiment
Below by embodiment and in conjunction with the accompanying drawings the present invention is done further detailed description.
Embodiment one
As shown in Figure 3, transformer T1 comprises two secondary windings that are connected in series: as the second winding W2 of secondary main winding with drive the tertiary winding W3 of winding as the secondary continued flow tube.(end of each winding punctuate is designated as " end of the same name " to the different name end of the second winding W2 among the figure, and a relative end is designated as " different name end ".Link to each other with the end of the same name of tertiary winding W3 down together).The drain electrode of rectifier switch pipe Q3 links to each other with the different name end of the second winding W2, and its grid links to each other with the end of the same name of the second winding W2 by the 3rd resistance R 1, and its source electrode links to each other with the source electrode of continued flow switch pipe Q4.The drain electrode of continued flow switch pipe Q4 links to each other with the end of the same name of the transformer T1 secondary second winding W2.The anode of the first diode D1 links to each other with the different name end of transformer T1 secondary tertiary winding W3, and its negative electrode links to each other with the drain electrode of positive clamping switching tube Q5.Positive clamping switching tube Q5 is the N-channel MOS pipe, and its source electrode is that its grid links to each other with the control end of continued flow switch pipe Q4, and its grid links to each other with the positive pole of source of stable pressure Vp.The negative pole of source of stable pressure Vp links to each other with the source electrode of continued flow switch pipe Q4.Negative clamping switching tube Q6 is the P channel MOS tube, its source electrode links to each other with the grid of continued flow switch pipe Q4, the control end of negative clamping switching tube Q6 is the end that grid connects this capacitor C 3, and the other end of this capacitor C 3 links to each other with the different name end of transformer T1 secondary tertiary winding W3 by first resistance R 2.The range of capacity of described capacitor C 3 is relevant with the characteristic of the continued flow switch pipe Q4 that needs to drive, and span can be from the pico farad level to microfarad range.
In the foregoing circuit, the positive clamping drive circuit comprises positive clamping switching tube Q5, the first diode D1 and source of stable pressure Vp, and positive clamping circuit is responsible for continued flow switch pipe Q4 charging and continued flow switch pipe Q4 is clamped to a high level; The back clamping drive circuit comprises back clamping switching tube Q6, first resistance R 2 and capacitor C 3, and the back clamping drive circuit is responsible for continued flow switch pipe Q4 back discharge, and the grid clamping of switching tube is arrived ground level.Obviously, positive clamping drive circuit and back clamping drive circuit also can make into to rectifier switch pipe Q3 clamp.
The operation principle of the specific embodiment of the invention one is as follows:
The driving voltage of transformer tertiary winding W3 generally be one asymmetric positive and negative to voltage, negative voltage is generally big a lot of than forward voltage, it is maximum withstand voltage that negative voltage makes the gate source voltage of negative clamping switching tube Q6 surpass easily.When tertiary winding W3 voltage is last negative timing down, by the first diode D1, positive clamping switching tube Q5 is the gate charges of continued flow switch pipe Q4, when continued flow switch pipe Q4 grid voltage reached Vp, positive clamping switching tube Q5 ended, and reaches the effect of positive clamping.This moment the P channel negative for just, negative clamping switching tube Q6 ends to the gate source voltage of clamp switch pipe Q6.When tertiary winding W3 voltage is last when negative just down, the gate source voltage of negative clamping switching tube Q6 is for negative, and negative clamping switching tube Q6 conducting is clamped to ground level with the gate source voltage of continued flow switch pipe Q4.Capacitor C 3 is serially connected with between the grid of the different name end of tertiary winding W3 and negative clamping switching tube Q6, the winding voltage phase shift is the driving voltage of weber balance (promptly the forward curve of voltage waveform equates with area that time shaft encloses with the negative sense curve in one-period) up and down, thereby reduced negative voltage greatly, first resistance R 2 can absorb a part of negative sense peak voltage simultaneously, again by switching tube Q6 negative clamping, promptly can overcome the defective that the gate source voltage of negative clamping switching tube Q6 in the prior art exceeds standard easily fully.Especially, the driving voltage of continued flow switch pipe Q4 remains between Vp voltage and the ground level and changes, and makes that the drain-source voltage of switching tube Q6 is to the maximum-Vp, has improved the reliability of Q6 greatly, has reduced the loss of Q6.After using this circuit, the driving voltage of continued flow switch pipe Q4 only changes between Vp, ground level, has reduced the drive loss of negative sense, has reached optimum Working, has improved DC/DC transducer reliability and efficient.
Waveform with experimental result comes effect of the present invention is described further below.As seen from Figure 4, the negative sense value of transformer tertiary winding W3 driving voltage waveform is very big in the DC/DC converter, and has big relatively spike.At existing synchronous rectification driving circuit as shown in Figure 2, the gate source voltage waveform of its pairing negative clamping switching tube is referring to Fig. 5, and wherein, the negative sense value of voltage waveform is very big, and this is very easy to cause the gate source voltage of clamp switch pipe to exceed standard.And as shown in Figure 6, the present invention is after having increased capacitor C 3, and the gate source voltage waveform of negative clamping switching tube Q6 forms the weber balance up and down, has reduced more than 50% than the waveform maximum negative value that does not add electric capacity.This gate source voltage that can significantly reduce negative clamping switching tube Q6 surpasses the probability of rated insulation voltage value, avoids negative clamping switching tube Q6 to damage.
As shown in Figure 7, the drain-source voltage waveform strictness of negative clamping switching tube Q6 changes between-Vp and ground level among the present invention.The reliability that this can improve negative clamping switching tube Q6 has greatly reduced the loss of negative clamping switching tube Q6.As shown in Figure 8, the positive and negative driving voltage to clamp subsequent flows pipe Q4 of the present invention between Vp and ground level, has reached desirable drive waveforms fully substantially., reduced the drive loss of continued flow tube Q4.
Embodiment two
Figure 9 shows that a kind of distortion of the specific embodiment of the invention one, only increased by second resistance R 3 that is connected in capacitor C 3 two ends in parallel on its basis, the circuit other parts remain unchanged.These second resistance R, 3 resistances are got higher value, and in 100K Ω magnitude, its effect is the waveform of control capacittance C3, the gate source voltage of fine setting negative clamping switching tube Q6.Other operation principle of present embodiment is analogous to embodiment one.
Embodiment three
As Figure 10, present embodiment is on the basis of embodiment two, and Q6 is replaced by diode D with the negative clamping switching tube.Wherein capacitor C 3 one ends link to each other with first resistance R 2, the drain electrode of the other end and positive clamping switching tube Q5 and the control end of diode D, and promptly its negative electrode links to each other, and the anode of diode D links to each other with the source electrode of rectifier switch pipe Q3.
The operation principle of present embodiment and the difference of aforementioned schemes are: the winding driving voltage of tertiary winding W3 is after capacitor C 3 phase shifts, with diode D to ground clamp, also, drive continued flow switch pipe Q4 through positive clamping switching tube Q5, the voltage stabilizing of source of stable pressure Vp forward.The characteristics of present embodiment are to be incorporated on the branch road to clamp circuit positive and negative, have realized making the driving voltage of continued flow switch pipe Q4 to change between Vp and ground level equally, and have changed negative clamping switching tube Q6 into diode D, have reduced cost.The body diode of W3 winding, Q3, first resistance R 2, diode D have not formed a loop if this circuit does not add electric capacity C, and the impedance in this loop is very little, directly form very big circulation, are easy to burn diode D.After adding capacitor C, this impedance loop obviously increases, and can not form very big electric current, avoids burning the diode D as the negative clamping device, thereby can guarantee the operate as normal of circuit.
Embodiment four
As Figure 11, on the basis of embodiment three, simplify once more, removed positive clamping circuit, promptly removed positive clamping switching tube Q5, source of stable pressure Vp.Present embodiment can be applied on the DC/DC converter of unusual low pressure, and the positive drive voltage of continued flow switch pipe Q4 is not high, and circuit structure is very simple.
Embodiment five
As Figure 12, on the basis of embodiment two, transformer T1 secondary has increased a winding that is connected in series with the second winding W2, promptly drive the 4th winding W4 of winding as rectifying tube, the different name end of the 4th winding W4 links to each other with the end of the same name of the second winding W2, the end of the same name of the 4th winding W4 links to each other with the grid of rectifier switch pipe Q3 by resistance R 1, and the source electrode of rectifier switch pipe Q3 links to each other with the different name end of the 4th winding W4, and the drain electrode of rectifier switch pipe Q3 links to each other with the drain electrode of continued flow switch pipe Q4.The operation principle of present embodiment is analogous to embodiment one, is suitable for the higher occasion of output voltage.
Embodiment six
As Figure 13, change positive and negative effective object into Q3 by Q4 on the basis of embodiment five to clamp circuit, operation principle is analogous to execution mode five.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that the present invention is determined by claims of being submitted to.
Claims (9)
1. the circuit of synchronous rectification of a DC/DC converter, comprise rectifying tube, continued flow tube and negative clamping drive circuit, described negative clamping drive circuit comprises the negative clamping device of the transformer secondary winding that is controlled by described DC/DC converter, described negative clamping device is used for being clamped to a low level to the discharge of rectifying tube and/or continued flow tube and with rectifying tube and/or continued flow tube, it is characterized in that:
The negative clamping drive circuit comprises electric capacity (C3), and described electric capacity one end connects with the transformer secondary winding electric of described DC/DC converter, and the other end links to each other with the control end of described negative clamping device.
2. the circuit of synchronous rectification of DC/DC converter according to claim 1 is characterized in that:
Also comprise first resistance (R2), described electric capacity links to each other with the transformer secondary winding of described DC/DC converter by first resistance (R2).
3. the circuit of synchronous rectification of DC/DC converter according to claim 2 is characterized in that:
Also comprise second resistance (R3), described second resistance (R3) is connected in parallel on the two ends of electric capacity (C3).
4. according to the circuit of synchronous rectification of the arbitrary described DC/DC converter of claim 1 to 3, it is characterized in that:
Also comprise and be used for the charging of rectifying tube and/or continued flow tube and rectifying tube and/or continued flow tube be clamped to the positive clamping circuit of a high level, described positive clamping circuit comprises positive clamping switching tube (Q5), source of stable pressure (Vp), the drain electrode of described positive clamping switching tube (Q5) connects with transformer secondary winding electric, grid links to each other with source of stable pressure (Vp) is anodal, and source electrode links to each other with the control end of described rectifying tube and/or continued flow tube.
5. according to the circuit of synchronous rectification of the arbitrary described DC/DC converter of claim 1 to 3, it is characterized in that:
The transformer secondary of described DC/DC converter comprises that the secondary main winding (W2), the continued flow tube that are connected in series drive winding (W3); Described rectifying tube is first nmos pass transistor (Q3), and described continued flow tube is second nmos pass transistor (Q4), and described negative clamping device is diode (D);
The end of the same name of the grid of described first nmos pass transistor (Q3) and secondary main winding (W2) electrically connects, and drain electrode links to each other with the different name end of secondary main winding (W2), and source electrode links to each other with the source electrode of second nmos pass transistor (Q4), the anode of diode (D);
The negative electrode of described diode (D) links to each other with the grid of second nmos pass transistor (Q4), electric capacity (C3), and described electric capacity (C3) electrically connects with the different name end that continued flow tube drives winding (W3).
6. the circuit of synchronous rectification of DC/DC converter according to claim 4 is characterized in that:
The transformer secondary of described DC/DC converter comprises that the secondary main winding (W2) and the continued flow tube that are connected in series drive winding (W3); Described rectifying tube is first nmos pass transistor (Q3), and described continued flow tube is second nmos pass transistor (Q4), and described negative clamping device is PMOS transistor (Q6);
The drain electrode of described first nmos pass transistor (Q3) links to each other with the different name end of secondary main winding (W2), source electrode links to each other with the source electrode of second nmos pass transistor (Q4), the drain electrode of PMOS transistor (Q6), the negative pole of source of stable pressure (Vp), and the end of the same name of grid and secondary main winding (W2) electrically connects;
The grid of described PMOS transistor (Q6) electrically connects by electric capacity (C3) and the different name end that continued flow tube drives winding (W3), and source electrode links to each other with the grid of second nmos pass transistor (Q4);
The source electrode of described positive clamping switching tube (Q5) links to each other with the grid of described second nmos pass transistor (Q4), and drain electrode links to each other with the different name end that continued flow tube drives winding (W3) by first diode (D1).
7. the circuit of synchronous rectification of DC/DC converter according to claim 4 is characterized in that:
The transformer secondary of described DC/DC converter comprises that the secondary main winding (W2), the continued flow tube that are connected in series drive winding (W3); Described rectifying tube is first nmos pass transistor (Q3), and described continued flow tube is second nmos pass transistor (Q4), and described negative clamping device is diode (D);
The end of the same name of the grid of described first nmos pass transistor (Q3) and secondary main winding (W2) electrically connects, drain electrode links to each other with the different name end of secondary main winding (W2), and source electrode links to each other with the source electrode of second nmos pass transistor (Q4), the anode of diode (D) and the negative pole of source of stable pressure (Vp);
The negative electrode of described diode (D) links to each other with the drain electrode of positive clamping switching tube (Q5), electric capacity (C3); The source electrode of described positive clamping switching tube (Q5) links to each other with the grid of described second nmos pass transistor (Q4), and drain electrode electrically connects by electric capacity (C3) and the different name end that continued flow tube drives winding (W3).
8. the circuit of synchronous rectification of DC/DC converter according to claim 4 is characterized in that:
The transformer secondary of described DC/DC converter comprises that the secondary main winding (W2), the continued flow tube that are connected in series drive winding (W3), rectifying tube drives winding (W4); Described rectifying tube is first nmos pass transistor (Q3), and described continued flow tube is second nmos pass transistor (Q4), and described negative clamping device is PMOS transistor (Q6);
The end of the same name that the grid of described first nmos pass transistor (Q3) and rectifying tube drive winding (W4) electrically connects, and source electrode links to each other with the different name end that rectifying tube drives winding (W4), and drain electrode links to each other with the drain electrode of second nmos pass transistor (Q4);
The grid of described PMOS transistor (Q6) electrically connects by electric capacity (C3) and the different name end that continued flow tube drives winding (W3), source electrode links to each other with the grid of second nmos pass transistor (Q4), and drain electrode links to each other with the negative pole of source of stable pressure (Vp), the source electrode of second nmos pass transistor (Q4) and the different name end of secondary main winding (W2);
The source electrode of described positive clamping switching tube (Q5) links to each other with the grid of described second nmos pass transistor (Q4), and drain electrode links to each other with the different name end that continued flow tube drives winding (W3) by first diode (D1).
9. the circuit of synchronous rectification of DC/DC converter according to claim 4 is characterized in that: the transformer secondary of described DC/DC converter comprises that the secondary main winding (W2), the continued flow tube that are connected in series drive winding (W3), rectifying tube drives winding (W4); Described rectifying tube is first nmos pass transistor (Q3), and described continued flow tube is second nmos pass transistor (Q4), and described negative clamping device is PMOS transistor (Q6);
The different name end that the grid of described second nmos pass transistor (Q4) and continued flow tube drive winding (W3) electrically connects, and source electrode links to each other with the different name end of secondary main winding (W2), and drain electrode links to each other with the drain electrode of first nmos pass transistor (Q3);
The source electrode of described positive clamping switching tube (Q5) links to each other with the grid of described first nmos pass transistor (Q3), and drain electrode links to each other with the end of the same name that rectifying tube drives winding (W4) by first diode (D1);
The grid of described PMOS transistor (Q6) electrically connects by electric capacity (C3) and the end of the same name that rectifying tube drives winding (W4), source electrode links to each other with the grid of first nmos pass transistor (Q3), and drain electrode links to each other with the different name end that rectifying tube drives winding (W4) with the negative pole of source of stable pressure (Vp), the source electrode of first nmos pass transistor (Q3).
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100742694A CN101047338A (en) | 2007-04-29 | 2007-04-29 | Synchronous rectificiation circuit of DC/DC inverter |
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| CNA2007100742694A CN101047338A (en) | 2007-04-29 | 2007-04-29 | Synchronous rectificiation circuit of DC/DC inverter |
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| CN101540544B (en) * | 2009-04-08 | 2012-06-06 | 艾默生网络能源有限公司 | Circuit used for drive control of flow current tube of direct current/direct current converter |
| CN103368425A (en) * | 2013-08-05 | 2013-10-23 | 北京新雷能科技股份有限公司 | Synchronous rectification driving circuit |
| CN104506044A (en) * | 2015-01-16 | 2015-04-08 | 深圳威迈斯电源有限公司 | Synchronization rectifier driving circuit of convertor |
| CN105763092A (en) * | 2008-01-31 | 2016-07-13 | 大金工业株式会社 | Power transformer |
| CN108063542A (en) * | 2018-01-12 | 2018-05-22 | 湖南工程学院 | A kind of simple and reliable inexpensive silicon carbide power switching device driving circuit |
| CN111342641A (en) * | 2020-03-04 | 2020-06-26 | 华为技术有限公司 | Drive circuit and drive system of power switch device |
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2007
- 2007-04-29 CN CNA2007100742694A patent/CN101047338A/en active Pending
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| CN105763072A (en) * | 2008-01-31 | 2016-07-13 | 大金工业株式会社 | Electric power conversion device |
| CN105763091A (en) * | 2008-01-31 | 2016-07-13 | 大金工业株式会社 | Electric power converter |
| CN105763093A (en) * | 2008-01-31 | 2016-07-13 | 大金工业株式会社 | Power transformer |
| CN105763092A (en) * | 2008-01-31 | 2016-07-13 | 大金工业株式会社 | Power transformer |
| CN101540544B (en) * | 2009-04-08 | 2012-06-06 | 艾默生网络能源有限公司 | Circuit used for drive control of flow current tube of direct current/direct current converter |
| CN102290996A (en) * | 2010-08-04 | 2011-12-21 | 崇贸科技股份有限公司 | Control circuit and synchronous rectification circuit |
| CN102290996B (en) * | 2010-08-04 | 2014-05-28 | 崇贸科技股份有限公司 | Control circuit and synchronous rectification circuit |
| CN103368425A (en) * | 2013-08-05 | 2013-10-23 | 北京新雷能科技股份有限公司 | Synchronous rectification driving circuit |
| CN103368425B (en) * | 2013-08-05 | 2016-01-20 | 北京新雷能科技股份有限公司 | A kind of synchronous rectification driving circuit |
| CN104506044A (en) * | 2015-01-16 | 2015-04-08 | 深圳威迈斯电源有限公司 | Synchronization rectifier driving circuit of convertor |
| CN104506044B (en) * | 2015-01-16 | 2017-03-22 | 深圳威迈斯电源有限公司 | Synchronization rectifier driving circuit of convertor |
| CN108063542A (en) * | 2018-01-12 | 2018-05-22 | 湖南工程学院 | A kind of simple and reliable inexpensive silicon carbide power switching device driving circuit |
| CN108063542B (en) * | 2018-01-12 | 2020-09-01 | 湖南工程学院 | Simple, reliable and low-cost driving circuit for silicon carbide power switch device |
| CN111342641A (en) * | 2020-03-04 | 2020-06-26 | 华为技术有限公司 | Drive circuit and drive system of power switch device |
| WO2021175085A1 (en) * | 2020-03-04 | 2021-09-10 | 华为技术有限公司 | Driving circuit of power switching device, and driving system |
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