CN102891604A - Isolation converter for isolation power supply and multi-output isolation power supply - Google Patents
Isolation converter for isolation power supply and multi-output isolation power supply Download PDFInfo
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Abstract
The invention relates to an isolation converter for an isolation power supply. The isolation converter for the isolation power supply comprises a first isolation transformer (T11) and a second isolation transformer (T12), wherein the primary sides of the first isolation transformer and the second isolation transformer (T11 and T12) are connected in parallel to the same primary side voltage; and the secondary side voltages of the first isolation transformer and the second isolation transformer (T11 and T12) are connected in series after being rectified. Therefore, the voltage withstanding requirements of involved circuit elements can be lowered; and high-voltage circuit elements with high cost and poor performance stability can be replaced by low-voltage elements with low cost and high performance stability. The conversion efficiency of the converter is improved, and simultaneously the circuit stability is improved and the production cost is reduced.
Description
Technical field
The present invention relates to a kind of isolated converter for insulating power supply, and a kind of multi-output isolated power supply that at least two supply power voltages are provided simultaneously.
Background technology
In a lot of circuit design, the power supply of some part of circuit may need with other parts of circuit isolated.Insulating power supply commonly used satisfies such demand.On the other hand, in actual applications, often needing provides different supply voltages for different circuit devcies simultaneously.At present, usually adopt multi-output isolated power supply to provide different circuit elements needed supply power voltage.
The isolated converter that uses in the multi-output isolated power supply of the prior art mainly adopts two kinds of structures.The a plurality of isolated converter Ci1～Cin of a kind of employing respectively with input voltage V
InConnect, shown in Figure 1A, the circuit element that the output Vo1～Von of each isolated converter is respectively different provides needed supply power voltage.The conversion efficiency of this structure is high, but because the cost of isolated converter is higher, adopts a plurality of isolated converters to increase undoubtedly the cost of isolated converter.
Another kind of isolated converter structure of the prior art as shown in Figure 1B, adopt an isolated converter Ci, the output of this isolated converter is connected to bus voltage, respectively bus voltage is converted to supply power voltage Vo1～Von that each circuit element needs by n non-isolated converter C1～Cn.This structure has reduced circuit cost owing to only adopted an isolated converter.Yet in actual applications, it is larger that the voltage that multi-output isolated power supply need to provide simultaneously may differ.For example multi-output isolated power supply may need simultaneously to be power amplification circuit and digital circuit power supply, and the supply power voltage that power amplification circuit needs is often higher, 28V for example, and the needed supply power voltage of digital circuit is often lower, for example 5.5V.At this moment adopt this structure power loss shown in Figure 1B larger.This is because bus voltage is relatively high, and is when the voltage that need to provide at multi-output isolated power supply is low, larger at the pressure reduction at converter two ends.For example when bus voltage was 36V, if converter need to provide for digital circuit the operating voltage of 5.5V, the pressure drop that produces at converter was 30.5V, produced thus larger power loss.
Summary of the invention
One object of the present invention is to provide a kind of conversion efficiency high, and power loss is little, and the low isolated converter of production cost.This will be very useful.
According to an aspect of the present invention, provide a kind of isolated converter for insulating power supply, having comprised: the first isolating transformer (T11); The second isolating transformer (T12); Wherein, described first and the former limit of described the second isolating transformer (T11, T12) be connected in parallel to identical original edge voltage, and the secondary voltage of described the first and second isolating transformers (T11, T12) is connected in series after rectification.
By two connections that isolating transformer is such, reduced the requirement of withstand voltage to related circuit element, can use low price, the low-voltage circuit element of stable performance replaces expensive, the high-tension circuit element that stability is poor has reduced production cost thus.
Further, the turn ratio of the first and second isolating transformers (T11, T12) is identical.
Thus so that the EMI common-mode noise of two isolating transformers cancel out each other, thereby do not need to arrange in addition common mode filtering circuit, simplify circuit.
According to another aspect of the present invention, a kind of multi-output isolated power supply that at least two supply power voltages are provided has simultaneously been proposed, comprising above-mentioned isolated converter, the first and second isolating transformer (T11, T12) high potential (Vo11, Vo12) of secondary voltage after over commutation connects respectively at least one converter (C1, Cn1, Cn2, Cn) input.
Further, described at least two supply power voltages comprise the first voltage and second voltage, and wherein, the first voltage is not more than 1/2nd of second voltage.
When multi-output isolated power supply is the power supply of the less circuit element of required supply power voltage, because the secondary voltage of the first isolating transformer is lower, the input that connects converter with the high potential of secondary voltage after over commutation of the first isolating transformer, can reduce the pressure drop at converter two ends, thereby reduce the power loss that produces at converter.
Description of drawings
More specifically describe of the present invention preferred by example with reference to the following drawings hereinafter
Embodiment:
Figure 1A and Figure 1B show the circuit block diagram that uses two kinds of multi-output isolated power supplies in the prior art,
Fig. 2 shows the circuit block diagram according to the isolated converter that is used for insulating power supply of one embodiment of the present of invention,
Fig. 3 shows a circuit block diagram of the multi-output isolated power supply that comprises the isolated converter shown in Fig. 2,
Fig. 4 shows another circuit block diagram of the multi-output isolated power supply that comprises the isolated converter shown in Fig. 2,
The more concrete circuit block diagram of the multi-output isolated power supply of embodiment among Fig. 4 has been shown among Fig. 5.
Embodiment
Fig. 2 shows the circuit block diagram according to the isolated converter that is used for insulating power supply of one embodiment of the present of invention.Metal-oxide-semiconductor M31, M32 shown in Fig. 2, M33, M34 are connected to form full bridge inverter, with the direct voltage V of input
InBe converted to alternating voltage, carry out voltage transitions to be used for transformer.Isolated converter comprises: the first isolating transformer T11; The second isolating transformer T12; Wherein, the former limit of the first and second isolating transformer T11, T12 is connected in parallel to identical original edge voltage, and namely input voltage is through the voltage after the inversion.The alternating voltage of the secondary output of the first and second isolating transformer T11, T12 is converted to direct voltage through rectification circuit.
In this embodiment, metal-oxide-semiconductor M11, M12 connect and compose the rectification circuit of the first isolating transformer T11, and metal-oxide-semiconductor M21, M22 connect and compose the rectification circuit of the second isolating transformer T12.Can be understood that the rectification circuit among Fig. 2 is not unique execution mode, can replace rectification circuit among Fig. 2 with any other rectification circuit well-known to those skilled in the art.Inductance L 11, L12 and L21 among Fig. 2, L22 strobe, and can make output voltage level and smooth, should be appreciated that inductance L 11, L12 and L21, L22 are not necessary with implementing for the understanding of the present invention.
The secondary voltage of the first and second isolating transformer T11, T12 is connected in series after rectification.Particularly, in Fig. 2, the reference ground of the first isolating transformer T11 secondary voltage after over commutation is Ref GND_1, and high potential is Vo11.The reference ground of the second isolating transformer T12 secondary voltage after over commutation is Ref_GND 2, and high potential is Vo12.Ref_GND1 is connected to the ground and connects, and Ref_GND 2 is connected with Vo11.
By two connections that isolating transformer T11, T12 are such, so that the required pressure drop of bearing of the circuit element in the rectification circuit reduces.Concrete reason is as follows:
For example, as input voltage V
InWhen being 72V through the voltage peak after the inversion, suppose that duty ratio is 0.5, in order to obtain the output voltage of 72V, for traditional isolated converter that only comprises an isolating transformer, can use the turn ratio for example is 1: 2 isolating transformer.Like this, the pressure drop that the components and parts that use in the rectification circuit that the secondary voltage of isolating transformer connects need to bear is 144V, and for example the metal-oxide-semiconductor in the rectification circuit may need to select for example metal-oxide-semiconductor of withstand voltage 200V.If yet use isolated converter structure shown in Figure 2, at input voltage V
InBeing similarly 72V and duty ratio through the voltage peak after the inversion is in 0.5 the situation, in order to obtain the output voltage V o12 of 72V, adopt two turn ratioes to be 1: 1 isolated converter T11 and T12, the pressure reduction between the pressure reduction between Vo11 and the Ref_GND 1 and Vo12 and the Ref_GND 2 only is 72V.Therefore the metal-oxide-semiconductor that metal-oxide-semiconductor M11, the M12 that adopts in the rectification circuit and M21, M22 can select withstand voltage 100V.Because withstand voltage high metal-oxide-semiconductor cost is often higher, and performance may be stable not as withstand voltage low metal-oxide-semiconductor, replaces withstand voltage high metal-oxide-semiconductor can reduce the cost of circuit with withstand voltage lower metal-oxide-semiconductor, realizes the raising of cost performance.
Can be understood that the first and second isolating transformer T11, T12 adopt the identical turn ratio so that the former limit of two isolating transformers and secondary EMI common-mode noise are cancelled out each other, thereby do not need to arrange in addition common mode filtering circuit, further simplify circuit.If two isolating transformer turn ratioes are different, may need to arrange extra common mode filtering circuit, but still can replace withstand voltage higher circuit element with withstand voltage lower circuit element, reach and reduce the effect that cost improves circuit stability.
Fig. 3 shows the circuit block diagram of the multi-output isolated power supply of the isolated converter shown in a kind of Fig. 2 of comprising.This multi-output isolated power supply provides altogether n voltage of Vo1-Von simultaneously, and wherein n is the positive integer more than or equal to 2.The high potential Vo11 of the secondary voltage of the first isolating transformer T11 after over commutation connects the input of converter C1-Cn1 among Fig. 2, and the high potential Vo12 of the secondary voltage of the second isolating transformer T12 after over commutation connects the input of converter Cn2-Cn.Wherein the output Vo1-Von1 of C1-Cn1 is used to and need to powers than the circuit block of large power supply voltage, and the output Von2-Von of Cn2-Cn is used to the circuit block power supply that needs small electric source voltage.Because Vo11 voltage is lower than Vo12, can be reduced in thus the pressure drop on the converter Cn2-Cn, thereby improve conversion efficiency.
Further, converter C1-Cn1 adopts non-isolated converter.Can reduce thus the number of the isolated converter that adopts, thereby reduce cost.
Further, the first isolating transformer T11 in the isolated converter that comprises in Fig. 3 and the turn ratio of the second isolating transformer T12 are at 1: 1 o'clock, and the pressure reduction between the pressure reduction between Vo11 and the Ref_GND 1 and Vo12 and the Ref_GND 2 equates.Vo12 can be connected to bus voltage, correspondingly, Vo11 be connected 1/2 bus voltage.Connect converter C1-Cn1 by bus voltage, in order to the output voltage of Vo1-Von1 to be provided, connect converter Cn2-Cn by 1/2 bus voltage, in order to the output voltage of Von2-Von to be provided.Be not more than at Von2-Von in 1/2nd the situation of Vo1-Von1, the multi-output isolated power supply that comprises isolated converter disclosed by the invention is very useful.Because in this case, foundation isolated converter of the present invention can reduce the pressure drop on the buck converter very significantly, improves conversion efficiency.
Fig. 4 shows the circuit block diagram according to the multi-output isolated power supply of an alternative embodiment of the invention.The output of converter C1, Cn is connected to other converter Cm11, the input of Cmn1-Cmnn, so that in output Vo1 and Von, can also export Vom11, Vomn1, Vomnn, to satisfy the power demands of different circuit units.Wherein Cm11, Cmn1-Cmnn can be non-isolated buck converters.
Being 18V take the pressure reduction between Vo11 and the Ref_GND 1 and the pressure reduction between Vo12 and the Ref_GND 2 in Fig. 5 describes as example.Vo11 is 18V with respect to the output voltage on ground, and Vo12 is 36V with respect to the output voltage on ground.Vo12 connects the buck converter C1 that the 36V voltage transitions can be become 28V voltage, and Vo11 connects the buck converter C2 that the 18V voltage transitions can be become 12V voltage.The output of C1 can provide for power amplification circuit the supply power voltage of 28V on the one hand, on the other hand can also cascaded buck converter Cm11, be used for the 28V voltage transitions is become 24V voltage, for needing the parts power supply of 24V supply power voltage in the circuit.The output of C2 can provide the supply power voltage of 12V on the one hand, on the other hand can also cascaded buck converter Cm21, be used for the 12V voltage transitions is become 5.5V voltage, for needing the parts power supply of 5.5V supply power voltage in the circuit.
In this embodiment, the pressure drop on converter C1 is 8V, and the pressure drop on converter C2 is 6V, and the pressure drop on converter Cm11 is 4V, and the pressure drop on Cm21 is 6.5V.If the isolated converter structure among employing Figure 1B, for above-mentioned 4 voltages are provided, need to use 36V to turn the converter of 28V, the converter that 36V turns 24V, the converter that 36V turns 12V, the converter that 36V turns 5.5V, the pressure drop on each converter is respectively 8V, 12V, 24V and 30.5V like this.Pressure drop in this case is obviously larger, and conversion efficiency is low.If adopt the structure of converter cascade, adopt successively isolation 36V to turn the converter of 28V, the converter that 28V turns 24V, the converter that 24V turns 12V, the converter that 12V turns 5.5V, conversion efficiency is low, poor stability, may there be beat frequency phenomenon, and have increased circuit cost and complexity.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned example embodiment, and in the situation that does not deviate from spirit of the present invention or essential characteristic, can realize the present invention with other concrete form.Therefore, in any case, all should regard embodiment as exemplary, and be nonrestrictive.In addition, significantly, " comprising ", other elements and step do not got rid of in a word, and wording " one " is not got rid of plural number.
Claims (8)
1. isolated converter that is used for insulating power supply comprises:
The first isolating transformer (T11);
The second isolating transformer (T12);
Wherein, described first and the former limit of described the second isolating transformer (T11, T 12) be connected in parallel to identical original edge voltage, and the secondary voltage of described the first and second isolating transformers (T11, T12) is connected in series after rectification.
2. isolated converter according to claim 1 is characterized in that, the turn ratio of described the first and second isolating transformers (T11, T12) is identical.
3. isolated converter according to claim 1 is characterized in that, the turn ratio of described the first and second isolating transformers (T11, T12) is 1: 1.
4. isolated converter according to claim 1, it is characterized in that, the reference ground (Ref_GND 1) of described the first isolating transformer (T11) secondary voltage after over commutation is connected to the ground and connects, and the reference ground (Ref_GND 2) of described the second isolating transformer (T12) secondary voltage after over commutation is connected with the high potential (Vo11) of described the first isolating transformer (T11) secondary voltage after over commutation.
5. multi-output isolated power supply that at least two supply power voltages are provided simultaneously, comprising the described isolated converter of any one in 5 according to claim 1, described the first and second isolating transformer (T11, T12) high potential (Vo11 of secondary voltage after over commutation, Vo12) connect respectively at least one converter (C1, Cn1, Cn2, Cn) input.
6. multi-output isolated power supply according to claim 5 is characterized in that, described at least two supply power voltages comprise the first voltage and second voltage, and wherein, described the first voltage is not more than 1/2nd of second voltage.
7. multi-output isolated power supply according to claim 5 is characterized in that, described at least one converter (C1, Cn1, Cn2, Cn) is non-isolated converter.
8. isolated converter according to claim 5 is characterized in that, described at least one converter (C1, Cn1, Cn2, Cn) in the output of at least one converter connect at least one other converter (Cm11, Cmn1, Cmnn) input.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102126161A CN102891604A (en) | 2011-07-22 | 2011-07-22 | Isolation converter for isolation power supply and multi-output isolation power supply |
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| CN2011102126161A CN102891604A (en) | 2011-07-22 | 2011-07-22 | Isolation converter for isolation power supply and multi-output isolation power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104753352A (en) * | 2013-12-26 | 2015-07-01 | 现代摩比斯株式会社 | Apparatus and method for providing multi-voltage output of low voltage dc-dc converter of eco-friendly vehicle |
| CN105656105A (en) * | 2014-12-03 | 2016-06-08 | 国家电网公司 | Battery pack system |
| CN113541448A (en) * | 2021-07-22 | 2021-10-22 | 山东鲁软数字科技有限公司智慧能源分公司 | Magnetic isolation multi-input multi-output flexible direct current power transmission supply circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753352A (en) * | 2013-12-26 | 2015-07-01 | 现代摩比斯株式会社 | Apparatus and method for providing multi-voltage output of low voltage dc-dc converter of eco-friendly vehicle |
| CN104753352B (en) * | 2013-12-26 | 2017-07-25 | 现代摩比斯株式会社 | Apparatus and method for multi-voltage output of low-voltage DC-DC converter for environment-friendly vehicles |
| CN105656105A (en) * | 2014-12-03 | 2016-06-08 | 国家电网公司 | Battery pack system |
| CN105656105B (en) * | 2014-12-03 | 2018-01-02 | 国家电网公司 | battery pack system |
| CN113541448A (en) * | 2021-07-22 | 2021-10-22 | 山东鲁软数字科技有限公司智慧能源分公司 | Magnetic isolation multi-input multi-output flexible direct current power transmission supply circuit |
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