CN101895197A - Passive equalizing soft switching circuit of high-frequency power electronic device with n serial diodes - Google Patents
Passive equalizing soft switching circuit of high-frequency power electronic device with n serial diodes Download PDFInfo
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- CN101895197A CN101895197A CN2010102385621A CN201010238562A CN101895197A CN 101895197 A CN101895197 A CN 101895197A CN 2010102385621 A CN2010102385621 A CN 2010102385621A CN 201010238562 A CN201010238562 A CN 201010238562A CN 101895197 A CN101895197 A CN 101895197A
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Abstract
The invention discloses a passive equalizing soft switching circuit of a high-frequency power electronic device with n serial diodes, which mainly comprises n high-frequency power electronic switches connected in series, a direct current power supply Ud, a load R and an inductor L, wherein the n is not less than 1; two ends of the load R are connected in anti-parallel with a diode D; two ends of each high-frequency power electronic switch are connected in parallel with a serial circuit formed by a capacitor C1 and a diode D1; two ends of the diode D1 of the serial circuit of the n high-frequency power electronic switch are connected in parallel with an energy feedback circuit formed by connecting a capacitor C2 in series with the primary winding T1 of a transformer T1; a diode D4 is respectively connected among the connection points of the capacitor C1 and the diode D1 of other adjacent serial circuits; and the energy is released by the secondary winding T2 of the transformer T, a diode D2, a diode D3, a capacitor C3 and an inductor L1. By the invention, the soft connection and soft disconnection of the n high-frequency power electronic switches can be achieved, the switch consumption is decreased, and the passive equalization of the n high-frequency power electronic switches can be realized.
Description
Technical field
The present invention relates to passive equalizing soft switching circuit, especially the passive equalizing soft switching circuit of n pipe series connection high-frequency power electronic devices
Background technology
Need a kind ofly can make the circuit of respectively managing dynamic voltage balancing during the series connection of n pipe high-frequency power electronic devices.No matter be that single tube operation or multitube series operation all need a kind of soft switch circuit that can reduce the dynamic switch loss when the high-frequency high voltage.Existing multitube high-frequency electron device series circuit or active, or adopt the way of power consumption to reach.The passive circuit of indivedual employings need utilize the pressure drop in the load to reach all and press, and it is subjected to load effect independence not enough, and can not form soft on-off action.
Summary of the invention:
The technical problem to be solved in the present invention is to overcome deficiency of the prior art, and a kind of passive equalizing soft switching circuit of n pipe series connection high-frequency power electronic devices is provided.
The passive equalizing soft switching circuit of n pipe series connection high-frequency power electronic devices of the present invention, comprise n the high-frequency power electronic switch that is connected in series, n 〉=1, DC power supply Ud, load R and inductance L, at load R two ends inverse parallel diode D, at DC power supply Ud two ends shunt capacitance C, the series circuit that constitutes by capacitor C 1 and diode D1 in the parallel connection of the two ends of each high-frequency power electronic switch, wherein be connected in parallel on the energy back circuit that the two ends parallel connection of diode D1 of the series circuit of n high-frequency power electronic switch is composed in series by the primary coil T1 of capacitor C 2 and transformer T, between the contact of the capacitor C 1 of all the other adjacent series circuits and diode D1, insert diode D4 respectively, wherein the anode of diode D4 links to each other with the anode of next stage diode D1, the negative electrode of diode D4 links to each other with the anode of upper level diode D1, the end of the secondary coil T2 of transformer T links to each other with the end of capacitance C3, the other end of capacitance C3 links to each other with the negative electrode of diode D2 and the anode of diode D3, the anode of diode D2 links to each other with DC power supply Ud negative pole, the negative electrode of diode D3 links to each other with an end of inductance L 1, another termination DC power supply Ud positive pole of inductance L 1, the other end of the secondary coil T2 of transformer T links to each other with the contact of inductance L 1 with diode D3.
When the high-frequency and high-voltage electric power electronic switch output of n series connection has big inductance, for the voltage that guarantees n high-frequency and high-voltage electric power electronic switch of connecting is no more than clamp voltage.The clamp circuit that can be composed in series by capacitor C 1 ' and diode D1 ' in the head and the tail two ends parallel connection of the n that is connected in series a high-frequency power electronic switch, another energy back circuit that is composed in series by the primary coil T1 ' of capacitor C 2 ' and transformer T ' in diode D1 ' two ends parallel connection, the end of the secondary coil T2 ' of transformer T ' links to each other with the end of capacitance C3 ', the other end of capacitance C3 ' links to each other with the negative electrode of diode D2 ' and the anode of diode D3 ', the anode of diode D2 ' links to each other with DC power supply Ud negative pole, the negative electrode of diode D3 ' links to each other with DC power supply Ud is anodal, the other end of the secondary coil T2 ' of transformer T ' links to each other with the negative electrode of diode D3 ', at the two ends inverse parallel diode D ' of load R that is connected in series and inductance L.
The passive equalizing soft switching circuit of above-mentioned n pipe series connection high-frequency power electronic devices, except the bigger transformer of volume, the chip and the subelement (for example being connected in parallel on the capacitor C 1 and diode D1 and diode D4 of each high-frequency power electronic switch ends) of n high-frequency power electronic switch can be packaged together.
In the passive equalizing soft switching circuit of above-mentioned n pipe series connection high-frequency power electronic devices, when n high-frequency power electronic switch turn-offs, voltage=Ud/n on the capacitor C 1, the turn ratio of transformer T should satisfy when n high-frequency power electronic switch conduction, can make the voltage on the capacitor C 1 begin to descend from Ud/n, capacitor C 1 both end voltage value is: 0≤capacitor C, 1 both end voltage≤Ud/n is passive equalizing hard switching circuit when dropping to Ud/n.The turn ratio that changes transformer T makes the voltage on the capacitor C 1 drop to voltage minimum UC1min from Ud/n, the different turn ratioes will have different UC1min values, the UC1min value can change between 0～Ud/n, the operation of UC1min=Ud/n interval scale hard switching pressure limiting clamper passive equalizing; The complete soft on off state operation of UC1min=0 interval scale.
In like manner, the turn ratio of transformer T ' should satisfy when n high-frequency power electronic switch conduction, can make the voltage on the capacitor C 1 ' begin to descend from Ud, capacitor C 1 ' both end voltage value is: 0≤capacitor C, 1 ' both end voltage≤Ud is passive equalizing hard switching circuit when dropping to Ud.
Beneficial effect of the present invention is:
The present invention can realize that the soft of n high-frequency power electronic switch open and soft shutoff, reduces the loss in the switching process, and can realize the passive equalizing of n high-frequency power electronic switch, can reduce volume greatly after being packaged into module.
Description of drawings
Fig. 1 is a kind of passive equalizing soft switching circuit schematic diagram of n pipe series connection high-frequency power electronic devices;
Fig. 2 is the passive equalizing soft switching circuit schematic diagram of second kind of n pipe series connection high-frequency power electronic devices;
Fig. 3 is the passive equalizing soft switching circuit oscillogram of n pipe series connection high-frequency power electronic devices.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail:
With reference to Fig. 1, the passive equalizing soft switching circuit of n pipe series connection high-frequency power electronic devices of the present invention, comprise n the high-frequency power electronic K switch 1 that is connected in series, K2...Kn, n 〉=1, DC power supply Ud, load R and inductance L, at load R two ends inverse parallel diode D, at DC power supply Ud two ends shunt capacitance C, the series circuit that constitutes by capacitor C 1 and diode D1 in the parallel connection of the two ends of each high-frequency power electronic switch, wherein be connected in parallel on the energy back circuit that the two ends parallel connection of diode D1 of the series circuit of n high-frequency power electronic switch is composed in series by the primary coil T1 of capacitor C 2 and transformer T, between the contact of the capacitor C 1 of all the other adjacent series circuits and diode D1, insert diode D4 respectively, wherein the anode of diode D4 links to each other with the anode of next stage diode D1, the negative electrode of diode D4 links to each other with the anode of upper level diode D1, the end of the secondary coil T2 of transformer T links to each other with the end of capacitance C3, the other end of capacitance C3 links to each other with the negative electrode of diode D2 and the anode of diode D3, the anode of diode D2 links to each other with DC power supply Ud negative pole, the negative electrode of diode D3 links to each other with an end of inductance L 1, another termination DC power supply Ud positive pole of inductance L 1, the other end of the secondary coil T2 of transformer T links to each other with the contact of inductance L 1 with diode D3.
When the high-frequency and high-voltage electric power electronic switch output of n series connection has big inductance, for the voltage that guarantees n high-frequency and high-voltage electric power electronic switch of connecting is no more than clamp voltage.Can be as shown in Figure 2, the n that is connected in series a high-frequency power electronic K switch 1, the clamp circuit that the head and the tail two ends parallel connection of K2...Kn is composed in series by capacitor C 1 ' and diode D1 ', another energy back circuit that is composed in series by the primary coil T1 ' of capacitor C 2 ' and transformer T ' in diode D1 ' two ends parallel connection, the end of the secondary coil T2 ' of transformer T ' links to each other with the end of capacitance C3 ', the other end of capacitance C3 ' links to each other with the negative electrode of diode D2 ' and the anode of diode D3 ', the anode of diode D2 ' links to each other with DC power supply Ud negative pole, the negative electrode of diode D3 ' links to each other with DC power supply Ud is anodal, the other end of the secondary coil T2 ' of transformer T ' links to each other with the negative electrode of diode D3 ', at the two ends inverse parallel diode D ' of load R that is connected in series and inductance L.
In the passive equalizing soft switching circuit of above-mentioned n pipe series connection high-frequency power electronic devices, when n high-frequency power electronic switch turn-offs, voltage=Ud/n on the capacitor C 1, the turn ratio of transformer T should satisfy when n high-frequency power electronic switch conduction, can make the voltage on the capacitor C 1 begin to descend from Ud/n, capacitor C 1 both end voltage value is: 0≤capacitor C, 1 both end voltage≤Ud/n, it when dropping to Ud/n passive equalizing hard switching circuit, the turn ratio that changes transformer T makes the voltage on the capacitor C 1 drop to voltage minimum UC1min from Ud/n, the different turn ratioes will have different UC1min values, the UC1min value can change between 0～Ud/n, the operation of UC1min=Ud/n interval scale hard switching pressure limiting clamper passive equalizing; The complete soft on off state operation of UC1min=0 interval scale.
In like manner, the turn ratio of transformer T ' should satisfy when n high-frequency power electronic switch conduction, can make the voltage on the capacitor C 1 ' begin to descend from Ud, capacitor C 1 ' both end voltage value is: 0≤capacitor C, 1 ' both end voltage≤Ud is passive equalizing hard switching circuit when dropping to Ud.
The operation principle explanation: with Fig. 1 is that example describes.
The principle of soft shutoff:
On high-frequency power electronic K switch 1...Kn-1, there is overvoltage to produce, utilize each self-corresponding capacitor C 1 of high-frequency power electronic switch to carry out clamper with diode D1 series circuit, and by diode D4, high-frequency power electronic K switch 1, K2 ... Kn-1 is pooled to the energy of rushing on each self-corresponding capacitor C 1 on the capacitor C 1 of n high-frequency power electronic K switch n correspondence, and the voltage that n high-frequency power electronic K switch 1...Kn goes up each capacitor C 1 two ends all can drop to UC1min.Thereby all can become soft off state.To the release of energy on the capacitor C 1 of high-frequency power electronic K switch n correspondence be elaborated below.Its oscillogram is seen Fig. 3.
(1) establishes original high-frequency power electronic K switch n conducting, flow through current i, and the voltage of establishing the capacitor C 1 of original high-frequency power electronic K switch n correspondence is zero, now when t=t0, high-frequency power electronic K switch n disconnects, and then the current i of high-frequency power electronic K switch n is cut off rapidly, changes its course by the capacitor C 1 and the diode D1 circulation of high-frequency power electronic K switch n correspondence, the voltage of capacitor C 1 slowly rises, and the voltage U at high-frequency power electronic K switch n two ends also slowly rises.Because the U value was very little before i dropped to zero, so the product of current i is little on switch ends voltage U and the switch, promptly turn-off power loss is little, also soft off state.It is zero that the diode D1 of high-frequency power electronic K switch n correspondence goes up voltage.
(2) after high-frequency power electronic K switch n turn-offed stable state, the voltage at capacitor C 1 two ends of high-frequency power electronic K switch n correspondence was raised to Ud/n, and the voltage on the diode D1 of high-frequency power electronic K switch n correspondence still is zero.
(3) then when t=t1, high-frequency power electronic K switch n conducting again, high-frequency power electronic K switch n both end voltage reduces to zero rapidly, but because the effect of diode D1, the electric charge of capacitor C 1 can not discharge rapidly, the voltage U C1 of capacitor C 1 will slowly descend, because this moment, capacitor C 1 will be through the Kn of conducting, the primary coil T1 of capacitor C 2 and transformer T discharges, the velocity of discharge of capacitor C 1 will be by the equiva lent impedance decision of the primary coil T1 of transformer T, voltage on the primary coil T1 of this section capacitor C 2 and transformer T in the time begins to be not equal to zero, slowly reduce to zero, capacitor C 1 is also like this, until high-frequency power electronic switch kn opens end (during t=t4).
(4) repeat the 1st step t=t0 during t=t5 ....
Voltage waveform U in such one-period on the primary coil T1 of capacitor C 2 and transformer T
(T1～C2)Contain DC component U
C2With alternating current component U
T1, DC component is wherein born on capacitor C 2, and alternating current component is born on the primary coil T1 of transformer T.The same on voltage waveform on the secondary coil T2 of transformer T and the capacitance C3 and the primary coil T1 of capacitor C 2 and transformer T, the big or small turn ratio of pressing transformer T is determined, designs the suitable turn ratio and makes the secondary coil T2 of transformer T and the voltage U on the capacitance C3
(T2～C3)Greater than supply voltage Ud.Such voltage is added on the circuit of supply voltage Ud and inductance L 1, to the current i L1 of inductance L 1 be risen gradually, the voltage of the primary coil T1 of capacitor C 1, capacitor C 2 and transformer T, the secondary coil T2 of transformer T and capacitance C3 descends U when t=t2 gradually
(T2～ C3)Equal Ud, this moment, iL1 reached maximum, i
L1maxThereafter U
(T2～C3)Less than Ud, iL1 begins to descend, U when t=t3
C1=0, establishing at this moment, iL1 drops to a certain numerical value i
L1 (t3), iL1 continues to descend up to zero (t=t4) thereafter, and U
C1Remain zero always.Begin until the t=t5 next cycle, high-frequency power electronic K switch n disconnects, the state when repeating t=t0 ....
According to top description and as seen to circuit: change the turn ratio of transformer T, the voltage of transformer secondary coil T2 is reduced, can reduce i to the explanation of principle
L1maxNumerical value, make U when iL1 drops to zero (t=t4)
C1Still greater than zero, this moment U
C1=U
C1min, later UC 1 just maintains U
C1minUp to t=t5, there is not the moment of t3 in this case.High-frequency power electronic K switch n disconnected when next cycle began, and U is from U
C1minSlowly rise to Ud/n, rather than slowly rise to Ud/n, the softening range of definition Soff for turn-offing, Soff=(Ud/n-U from zero
C1min)/Ud/n.Change the turn ratio of transformer T, can change Soff from 0 to 1.0.If Soff=0 represents that then high-frequency power electronic K switch n is a hard switching fully, the capacitor C 1 of high-frequency power electronic K switch n correspondence has just played dynamic clamper, has no emollescence, and inductance L 1 can be very little or removes in this case.
The soft principle of opening:
The inductance L that in the described circuit of Fig. 1, seals in, its numerical value is little, and ideal situation is to adopt nonlinear inductance, and inductance is less during the big and big electric current of inductance when little electric current, but it can play soft effect of opening.It makes that the electric current rising was slower when high-frequency power electronic K switch n opened, and the voltage U of high-frequency power electronic K switch n quickly falls to zero.Thereby make the product of current i on switch ends voltage U and the switch little, soft opening state.
In Fig. 1 circuit, design Soff=0, the turn ratio of the former secondary coil T1/T2 of transformer T is 1: 1, L1=0, Fig. 1 circuit has only played electric capacity clamper passive equalizing like this, and then in n switch series connection back and connect a total softening circuit, as shown in Figure 2, secondary coil T2 ', capacitor C 3 ', diode D2 ', diode D3 ', the coil L1 ' of primary coil T1 ', the transformer T ' of the capacitor C 1 ' among Fig. 2, diode D1 ', capacitor C 2 ', another transformer T ' have formed soft breaking circuit.When there is big inductance L in the external circuit in the circuit, when n high-frequency power electronic K switch 1...Kn turn-offed, the voltage meeting upper punch on capacitor C 1, the capacitor C 1 ' was very high, and we also will add a diode in this case, shown in the diode D ' among Fig. 2, its basic principle is identical with Fig. 1.Fig. 1 also can change similarly simultaneously.
At last, it is also to be noted that what more than enumerate only is specific embodiments of the invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Claims (5)
1.n the passive equalizing soft switching circuit of pipe series connection high-frequency power electronic devices, it is characterized in that comprising n the high-frequency power electronic switch (K1 that is connected in series, K2...Kn), n 〉=1, DC power supply Ud, load R and inductance L, at load R two ends inverse parallel diode D, at DC power supply Ud two ends shunt capacitance C, the series circuit that constitutes by capacitor C 1 and diode D1 in the parallel connection of the two ends of each high-frequency power electronic switch, wherein be connected in parallel on the energy back circuit that the two ends parallel connection of diode D1 of the series circuit of n high-frequency power electronic switch is composed in series by the primary coil T1 of capacitor C 2 and transformer T, between the contact of the capacitor C 1 of all the other adjacent series circuits and diode D1, insert diode D4 respectively, wherein the anode of diode D4 links to each other with the anode of next stage diode D1, the negative electrode of diode D4 links to each other with the anode of upper level diode D1, the end of the secondary coil T2 of transformer T links to each other with the end of capacitance C3, the other end of capacitance C3 links to each other with the negative electrode of diode D2 and the anode of diode D3, the anode of diode D2 links to each other with DC power supply Ud negative pole, the negative electrode of diode D3 links to each other with an end of inductance L 1, another termination DC power supply Ud positive pole of inductance L 1, the other end of the secondary coil T2 of transformer T links to each other with the contact of inductance L 1 with diode D3.
2. the passive equalizing soft switching circuit of n pipe series connection high-frequency power electronic devices according to claim 1, it is characterized in that at the n that is connected in series a high-frequency power electronic switch (K1, K2...Kn) clamp circuit that head and the tail two ends parallel connection is composed in series by capacitor C 1 ' and diode D1 ', another energy back circuit that is composed in series by the primary coil T1 ' of capacitor C 2 ' and transformer T ' in diode D1 ' two ends parallel connection, the end of the secondary coil T2 ' of transformer T ' links to each other with the end of capacitance C3 ', the other end of capacitance C3 ' links to each other with the negative electrode of diode D2 ' and the anode of diode D3 ', the anode of diode D2 ' links to each other with DC power supply Ud negative pole, the negative electrode of diode D3 ' links to each other with DC power supply Ud is anodal, the other end of the secondary coil T2 ' of transformer T ' links to each other with the negative electrode of diode D3 ', at the two ends inverse parallel diode D ' of load R that is connected in series and change of current inductance L.
3. the passive equalizing soft switching circuit of n pipe series connection high-frequency power electronic devices according to claim 1 and 2 is characterized in that the chip and the subelement of n high-frequency power electronic switch are packaged together.
4. the passive equalizing soft switching circuit of n pipe series connection high-frequency power electronic devices according to claim 1, it is characterized in that: when n high-frequency power electronic switch turn-offs, voltage=Ud/n on the capacitor C 1, the turn ratio of transformer T should satisfy when n high-frequency power electronic switch conduction, can make the voltage on the capacitor C 1 begin to descend from Ud/n, capacitor C 1 both end voltage value is: 0≤capacitor C, 1 both end voltage≤Ud/n is passive equalizing hard switching circuit when dropping to Ud/n.
5. the passive equalizing soft switching circuit of n pipe series connection high-frequency power electronic devices according to claim 2, it is characterized in that: when n high-frequency power electronic switch turn-offs, voltage=Ud on the capacitor C 1 ', the turn ratio of transformer T ' should satisfy when n high-frequency power electronic switch conduction, can make the voltage on the capacitor C 1 ' begin to descend from Ud, capacitor C 1 ' both end voltage value is: 0≤capacitor C, 1 ' both end voltage≤Ud is passive equalizing hard switching circuit when dropping to Ud.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102385621A CN101895197B (en) | 2010-07-28 | 2010-07-28 | Passive equalizing soft switching circuit of high-frequency power electronic device with n serial diodes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102385621A CN101895197B (en) | 2010-07-28 | 2010-07-28 | Passive equalizing soft switching circuit of high-frequency power electronic device with n serial diodes |
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| Publication Number | Publication Date |
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| CN101895197A true CN101895197A (en) | 2010-11-24 |
| CN101895197B CN101895197B (en) | 2012-10-31 |
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|---|---|---|---|
| CN2010102385621A Expired - Fee Related CN101895197B (en) | 2010-07-28 | 2010-07-28 | Passive equalizing soft switching circuit of high-frequency power electronic device with n serial diodes |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019241924A1 (en) * | 2018-06-20 | 2019-12-26 | 何曙光 | Direct-current soft switching-off module |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000197370A (en) * | 1998-12-24 | 2000-07-14 | Tohoku Ricoh Co Ltd | Switching regulator device |
| CN201797439U (en) * | 2010-07-28 | 2011-04-13 | 汪槱生 | Passive voltage-sharing soft switch circuit of series high frequency power electronic device |
-
2010
- 2010-07-28 CN CN2010102385621A patent/CN101895197B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000197370A (en) * | 1998-12-24 | 2000-07-14 | Tohoku Ricoh Co Ltd | Switching regulator device |
| CN201797439U (en) * | 2010-07-28 | 2011-04-13 | 汪槱生 | Passive voltage-sharing soft switch circuit of series high frequency power electronic device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019241924A1 (en) * | 2018-06-20 | 2019-12-26 | 何曙光 | Direct-current soft switching-off module |
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| CN101895197B (en) | 2012-10-31 |
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