CN1728298A - A kind of commutator transformer and use the DC-DC converter of this commutator transformer - Google Patents
A kind of commutator transformer and use the DC-DC converter of this commutator transformer Download PDFInfo
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- CN1728298A CN1728298A CN 200410050946 CN200410050946A CN1728298A CN 1728298 A CN1728298 A CN 1728298A CN 200410050946 CN200410050946 CN 200410050946 CN 200410050946 A CN200410050946 A CN 200410050946A CN 1728298 A CN1728298 A CN 1728298A
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Abstract
A kind of DC-DC converter, it comprises an input filter, and one does not have control semi-bridge convertor, a synchronous rectifier, an output capacitance, and a commutator transformer.This commutator transformer comprises an iron core, a primary coil, one first secondary coil and a second subprime coil.The iron core of this commutator transformer comprises second socle that one first socle, has one first air gap, and the 3rd socle with an interstice.This first secondary coil is wound in this first socle and this second socle, and produces one first inductance by this first air gap.This second subprime coil is wound in this first socle and the 3rd socle, and produces one second inductance by this interstice.Adopt DC-DC converter of the present invention, must on printed circuit board (PCB), not make inductance, can suppress the noise of output voltage, therefore can reduce the loss of inductance, improve the efficient of commutator transformer and the power density of product.
Description
[technical field]
The invention provides a kind of commutator transformer, refer to a kind of DC-DC converter that outputting inductance is integrated in the commutator transformer of iron core and uses this commutator transformer especially.
[background technology]
Transformer is that two coils by the iron core of an intercommunication and insulation are formed, and is medium with the iron core, and with two coil combinations.When therefore alternating current being passed to primary coil, can produce the flux that becomes orthogonal with coil in iron core, utilize this flux, produce voltage at secondary coil, the size of this voltage is directly proportional with the number of turn of secondary coil.Therefore, select the suitable number of turn can obtain the voltage of size arbitrarily.
Please refer to Fig. 1, be depicted as the block schematic diagram of existing DC-DC converter.Have a primary coil (primary winding) and a level coil (secondary winding) on the iron core 12 of the commutator transformer 10 of DC-DC converter, primary coil is used for importing an input voltage vin, usually input voltage vin can be carried out filtering through an input filter 14 earlier, be resent to one and do not have control semi-bridge convertor (half-bridge converter without PWM control function) 41, behind iron core 12 changing voltages of commutator transformer 10 by secondary coil output, and by the voltage of secondary coil output via synchronous rectifier 42 rectifications after obtain an output voltage V o by an output filter 16 filtering.Suppose that the primary coil of commutator transformer 10 and the turn ratio of secondary coil are N, the responsibility cycle of commutator transformer 10 is D, and then output voltage V o can be expressed as Vo=(D/2N) Vin.
Please refer to Fig. 2, be depicted as the transformer core 12 of existing commutator transformer 10 and the schematic diagram of coil.Have a primary coil 13, one first secondary coil 15 and a second subprime coil 17 on the iron core 12 of commutator transformer 10.The EE type that is shaped as of iron core 12 comprises three socles 121,122,123, and primary coil 13 can be wound in transformer core 12 in a different manner, for example only is wound in first socle 121, or is wound in second socle 122 and the 3rd socle 123 simultaneously.Similarly, secondary coil also can have different canoes, and as shown in Figure 2, secondary coil only is wound in first socle 121, pulls out in the mode of centre tap (center tap) again, forms first secondary coil 15 and second subprime coil 17.
Please refer to Fig. 3, be depicted as the circuit diagram of existing DC-DC converter.DC-DC converter comprise an input filter 14 (C1, L1), one do not have control semi-bridge convertor 41 (C2, C3, Q1, Q2), a commutator transformer 10, one synchronous rectifiers 42 (Q3, Q4), and an output filter 16 (L2, C4).Commutator transformer 10 comprises a transformer core 12, a primary coil 13, first secondary coil 15, second subprime coil 17 and an ancillary coil 19, and the input filter 14 that input inductance L1 and input capacitance C1 are formed is used for input voltage vin is carried out filtering.Primary coil 13 connects by two switch Q1, Q2 and two capacitor C 2, and the nothing control semi-bridge convertor 41 that C3 formed is used for driving commutator transformer 10.First secondary coil 15 and second subprime coil 17 are connected the switch Q3 of synchronous rectifier 42 respectively, Q4, and ancillary coil 19 can be used to provide the operating voltage of switch Q3, Q4.Outputting inductance L2 and output capacitance C4 form output filter 16, are used for the voltage of commutator transformer 10 conversions is carried out filtering, to produce output voltage V o.
From the above; existing commutator transformer suppresses the noise of output voltage; usually can connect the output filter of forming by an outputting inductance and an output capacitance in the synchronous rectifier rear end, adjust the inductance value of outputting inductance thus, be used for suppressing the noise of output voltage.Yet along with development of integrated circuits, Inductive component is owing to need take more printed circuit board space, therefore can avoid in design as far as possible or seek replacement scheme, in addition, be subject to the specification of outputting inductance, the impedance meeting causes the loss of electric power, reduces the efficient of power conversions.
[summary of the invention]
At the deficiency that above-mentioned prior art exists, the DC-DC converter that main purpose of the present invention is to provide a kind of commutator transformer and uses this commutator transformer.
Commutator transformer provided by the invention comprises an iron core, and it comprises second socle that one first socle, has one first air gap, and the 3rd socle with an interstice; One primary coil is wound in this first socle; One first secondary coil is wound in this first socle and this second socle, and produces one first inductance by this first air gap; One second subprime coil is wound in this first socle and the 3rd socle, and produces one second inductance by this interstice.
DC-DC converter provided by the invention comprises an input filter, and one does not have control semi-bridge convertor, a synchronous rectifier, an above-mentioned commutator transformer, and an output capacitance.
Adopt DC-DC converter of the present invention, must on printed circuit board (PCB), not make inductance, can suppress the noise of output voltage, therefore can reduce the loss of inductance, improve the efficient of commutator transformer and the power density of product.
[description of drawings]
Fig. 1 is existing DC-DC converter block schematic diagram, and this DC-DC converter comprises a commutator transformer.
Fig. 2 is the commutator transformer schematic diagram among Fig. 1.
Fig. 3 is a DC-DC converter circuit diagram shown in Figure 1.
Fig. 4 is a DC-DC converter block schematic diagram of the present invention, and this DC-DC converter comprises a commutator transformer.
Fig. 5 is the commutator transformer schematic diagram among Fig. 4.
Fig. 6 is a DC-DC converter circuit diagram shown in Figure 4.
Fig. 7 is a DC-DC converter operation waveform diagram shown in Figure 4.
Fig. 8 is a DC-DC converter output voltage waveform shown in Figure 1.
Fig. 9 is a DC-DC converter output voltage waveform shown in Figure 4.
Figure 10 is the iron core schematic diagram of EE type transformer.
Figure 11 is the iron core schematic diagram of EI type transformer.
Figure 12 is the iron core schematic diagram of EQ type transformer.
Figure 13 is the iron core schematic diagram of RM type transformer.
[embodiment]
Please refer to Fig. 4, be depicted as the block schematic diagram of DC-DC converter 40 of the present invention.DC-DC converter 40 among the figure comprises a commutator transformer 20, be wound with a primary coil (primary winding) and two secondary coils (secondary windings) on the iron core 22 of commutator transformer 20, primary coil is used for importing an input voltage vin, usually input voltage vin can be carried out filtering via an input filter 24 earlier, is not resent to the primary coil of iron core 22 through there being control semi-bridge convertor (half-bridge converter without PWM controlfunction) 43.The different iron cores 22 that outputting inductance are integrated in commutator transformer 20 in the present invention that are in of commutator transformer 20 of the present invention and previous commutator transformer 10 maximums, therefore only need to connect an output capacitance 26 by the voltage of the secondary coil output of iron core 22 after through synchronous rectifier 44 rectifications and carry out filtering, can obtain an output voltage V o.
Please refer to Fig. 5, be depicted as the transformer core 22 of commutator transformer 20 of the present invention and the schematic diagram of coil.The present invention utilizes the principle of air gap energy storage, the secondary coil of iron core 22 is wound in the socle that iron core 22 has air gap, produce equivalent inductance, in order to replace outputting inductance, the outputting inductance that connected of commutator transformer 20 just can be integrated in the transformer core 22 of commutator transformer 20 like this.With EE sections core 22 is example, it comprises three socles 221,222,223, form first air gap 34 and interstice 36 according to the present invention respectively in second socle 222 and the 3rd socle 223, this moment, 28 of primary coils were wound in first socle 221, and secondary coil also is wound in first socle 221, pull out in the mode of centre tap (center tap) again, form first secondary coil 30 and second subprime coil 32.In embodiments of the present invention, first secondary coil 30 also is wound on second socle 222 with first air gap 34, and second subprime coil 32 also is wound on the 3rd socle 223 with interstice 36.When coil is wound in the socle with air gap,, can produce equivalent inductance by the air gap energy storage.
Please refer to Fig. 6, be depicted as the circuit diagram of DC-DC converter 40 of the present invention.Input filter 24 is made up of an input inductance L1 and an input capacitance C1, is used for input voltage vin is carried out filtering.Primary coil 28 connects nothing control semi-bridge convertor, and (Q1 Q2), is used for driving commutator transformer 20 for C2, C3.First secondary coil 30 and second subprime coil 32 connect switch Q3, the Q4 of synchronous rectifier 44 respectively, and ancillary coil 38 can be used to provide the switch Q3 of synchronous rectifier 44, the operating voltage of Q4.Because the iron core 22 of commutator transformer 20 and coil are according to improvement shown in Figure 5, therefore first secondary coil 30 on the transformer core 22 of commutator transformer 20 and second subprime coil 32 are equivalent to connect respectively one first equivalent inductance L21 and the one second equivalent inductance L22 outputting inductance as two level coils, so 26 of output filters need to use an output capacitance C4, just can carry out filtering to the voltage of commutator transformer 20 conversions, produce output voltage V o.
Please refer to Fig. 7, be depicted as the operation waveform diagram of DC-DC converter 40.First waveform is the control signal of switch Q1, and second waveform is the control signal of switch Q2, and Vp is the voltage at primary coil two ends, and Vos is a synchronous rectification voltage, and Vo is an output voltage.Switch Q1 and switch Q2 are the complementary operation pattern, and promptly when switch Q1 conducting, switch Q2 ends, and the duty ratio of switch Q1 and Q2 is near 50%.The working method of DC-DC converter can be divided into one of four states, wherein first state is switch Q1 conducting and switch Q2 ends, this moment, the voltage of primary coil 28 was coupled to first secondary coil 30 via iron core 22, followed store energy in the first equivalent inductance L21.When switch Q2 will be by when forwarding the state of conducting to, for preventing switch Q1 and switch Q2 conducting simultaneously, cause short circuit to make the serious consequence of circuit burnout, must enter second state earlier, be that switch Q1 and switch Q2 are the situation of ending, Td is called deadline (dead time) during this period of time, this moment, the primary coil 28 of commutator transformer 20 did not have energy to be coupled to 30 of first secondary coil 30 and second subprime coil 32, the first secondary coils the energy that Last status is stored in the first equivalent inductance L21 is sent to output capacitance 26 fully.Then enter the 3rd state, promptly switch Q1 by and switch Q2 conducting, this moment primary coil 28 voltage be coupled to second subprime coil 32 via iron core 22, make second subprime coil 32 with store energy in the second equivalent inductance L22.Similarly, when switch Q1 will also must make switch Q1 and switch Q2 end earlier by when forwarding the state of conducting to, cause circuit burnout to avoid short circuit, this is an one of four states, gets back to first state afterwards again, and so circulation is gone down.
Figure 8 shows that the oscillogram of the output voltage of existing DC-DC converter 10, its input voltage vin=48V, output voltage V o=5V, output current Io=10A, the ripple peak of output voltage is 42mV to peak value, delivery efficiency is 90%.Figure 9 shows that the oscillogram of the output voltage of DC-DC converter 20 of the present invention, its input voltage vin=48V, output voltage V o=5V, output current Io=10A, the ripple peak of output voltage is 31.9mV to peak value, delivery efficiency is 90.5%.By the experiment simulation data as can be known, commutator transformer 20 of the present invention can reduce the ripple peak of output voltage of DC-DC converter 40 to peak value, and improves the delivery efficiency of DC-DC converter 40.
Figure 10 and Figure 11 are depicted as the schematic diagram of EE sections core 100 and EI sections core 110 respectively.Though 22 need of iron core shown in Figure 5 form air gap 34 and 36 on second socle 222 and the 3rd socle 223, yet in practical application, if all form air gap on three socles of iron core, with easier reaching, and manufacturing cost is also lower.As Figure 10 and shown in Figure 11, air gap 1010,1020 is all arranged, 1030 and 1110,1120,1130 respectively on iron core 100 and 110 three socles 101,102,103 and 111,112,113.The employed iron core of commutator transformer of the present invention, except EE and EI type, EQ sections core 120 also shown in Figure 12 or RM sections core 130 as shown in figure 13 etc.In addition, the size of the air gap of iron core approximately only needs to get final product between 0.02-0.07mm.
From the above, commutator transformer of the present invention uses the iron core with air gap, common have an EE, EI, pattern such as EQ or RM iron core, the secondary coil of commutator transformer need be wound in the socle that iron core has air gap again, to produce equivalent inductance, commutator transformer just must not add outputting inductance like this, the output voltage noise that can suppress commutator transformer, and the commutator transformer behind the integration outputting inductance, can dwindle the volume of product, reduce the loss of inductance, and improve the efficient of DC-DC converter, and, integrate the power density that also can improve product behind the outputting inductance.
Compared with prior art, commutator transformer utilization of the present invention has the iron core of air gap and secondary The canoe of coil is integrated in iron core with outputting inductance, has saved at printed circuit board (PCB) and has made electricity The space of sense. Existing commutator transformer must form outputting inductance at printed circuit board (PCB), to suppress defeated Go out the noise of voltage, yet Inductive component but can take the space of more printed circuit board (PCB), increase product Volume, and be subject to the specification of outputting inductance, the impedance meeting causes the loss of electric power, reduces electric power The efficient of conversion. Commutator transformer of the present invention must not made inductance at printed circuit board (PCB), can suppress Therefore the noise of output voltage can reduce the loss of inductance, improves efficient and the product of commutator transformer The power density of product.
Claims (15)
1. commutator transformer, it includes the second subprime coil that first secondary coil and that primary coil, that an iron core, is wound in this iron core is wound in this iron core is wound in this iron core, it is characterized in that: this iron core has air gap, described first secondary coil produces one first inductance by the air gap of this iron core, and described second subprime coil produces one second inductance by the air gap of this iron core.
2. commutator transformer as claimed in claim 1 is characterized in that: further comprise an output capacitance, be connected centre tap (center tap) end of this first secondary coil, this second subprime coil.
3. commutator transformer as claimed in claim 1 is characterized in that: the size of the air gap of this iron core is 0.02-0.07mm.
4. commutator transformer as claimed in claim 1 is characterized in that: this iron core is EE, EI, EQ or RM sections core.
5. commutator transformer as claimed in claim 1 is characterized in that: this iron core comprises one first socle, one second socle and one the 3rd socle.
6. commutator transformer as claimed in claim 5 is characterized in that: this second socle comprises one first air gap, and this first secondary coil is wound in this first socle and this second socle, and produces this first inductance by this first air gap.
7. commutator transformer as claimed in claim 5 is characterized in that: the 3rd socle comprises an interstice, and this second subprime coil is wound in this first socle and the 3rd socle, and produces this second inductance by this interstice.
8. commutator transformer as claimed in claim 5 is characterized in that: this primary coil is wound in this first socle.
9. commutator transformer as claimed in claim 5 is characterized in that: this first socle comprises one the 3rd air gap.
10. commutator transformer as claimed in claim 5 is characterized in that: this first socle does not have any air gap.
11. a DC-DC converter, including an input filter, does not have control semi-bridge convertor, a commutator transformer, a synchronous rectifier and an output capacitance, it is characterized in that this commutator transformer is integrated in an outputting inductance wherein, and comprises:
One has the iron core of air gap, and it comprises second socle that one first socle, has one first air gap, and the 3rd socle with an interstice;
One is wound in the primary coil of this first socle;
One first secondary coil is wound in this first socle and this second socle, and produces one first inductance by this first air gap; And
One second subprime coil is wound in this first socle and the 3rd socle, and produces one second inductance by this interstice.
12. DC-DC converter as claimed in claim 11 is characterized in that: the size of gaps of this iron core is 0.02-0.07mm.
13. DC-DC converter as claimed in claim 11 is characterized in that: this iron core is EE, EI, EQ or RM sections core.
14. DC-DC converter as claimed in claim 11 is characterized in that: this first socle comprises one the 3rd air gap.
15. DC-DC converter as claimed in claim 11 is characterized in that: described output capacitance is connected in first secondary coil of this commutator transformer and the centre tap of this second subprime coil (center tap) end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100509465A CN100437846C (en) | 2004-07-28 | 2004-07-28 | DC transformer, and DC/DC converter of using the DC transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100509465A CN100437846C (en) | 2004-07-28 | 2004-07-28 | DC transformer, and DC/DC converter of using the DC transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1728298A true CN1728298A (en) | 2006-02-01 |
| CN100437846C CN100437846C (en) | 2008-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100509465A Expired - Fee Related CN100437846C (en) | 2004-07-28 | 2004-07-28 | DC transformer, and DC/DC converter of using the DC transformer |
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| Country | Link |
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| CN (1) | CN100437846C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104428848A (en) * | 2012-07-12 | 2015-03-18 | 黑拉许克联合股份有限公司 | Transformer for storing and filtering |
| CN104701000A (en) * | 2013-12-04 | 2015-06-10 | 台达电子企业管理（上海）有限公司 | Integrated magnetic component and full-wave rectification converter applying same |
| CN105893677A (en) * | 2016-04-01 | 2016-08-24 | 上海交通大学 | DC power distribution grid DC transformer power-voltage characteristic simulation model and simulation method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004040600A1 (en) * | 2002-10-30 | 2004-05-13 | Pyongyang Technical Trading Centre | Transformer |
-
2004
- 2004-07-28 CN CNB2004100509465A patent/CN100437846C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104428848A (en) * | 2012-07-12 | 2015-03-18 | 黑拉许克联合股份有限公司 | Transformer for storing and filtering |
| CN104701000A (en) * | 2013-12-04 | 2015-06-10 | 台达电子企业管理（上海）有限公司 | Integrated magnetic component and full-wave rectification converter applying same |
| US9667151B2 (en) | 2013-12-04 | 2017-05-30 | Delta Electronics (Shanghai) Co., Ltd. | Integrated magnetic component and converter using the same |
| CN105893677A (en) * | 2016-04-01 | 2016-08-24 | 上海交通大学 | DC power distribution grid DC transformer power-voltage characteristic simulation model and simulation method |
| CN105893677B (en) * | 2016-04-01 | 2018-10-19 | 上海交通大学 | DC distribution net commutator transformer power voltage characteristic Simulation model and emulation mode |
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| Publication number | Publication date |
|---|---|
| CN100437846C (en) | 2008-11-26 |
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