CN211183801U - LL C resonant DC/DC converter - Google Patents
LL C resonant DC/DC converter Download PDFInfo
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- CN211183801U CN211183801U CN201922303034.9U CN201922303034U CN211183801U CN 211183801 U CN211183801 U CN 211183801U CN 201922303034 U CN201922303034 U CN 201922303034U CN 211183801 U CN211183801 U CN 211183801U
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Abstract
The utility model discloses an LL C resonance type DC/DC converter, including three level switch circuit, resonant circuit and a N power unit, power unit includes two transformers and two rectifier circuits, resonant circuit's resonance electric capacity, connect three level switch circuit's input after the primary winding of resonance inductance and all transformers is established ties, the transformer includes two secondary windings, in same power unit, the first secondary winding of first transformer and the first secondary winding of second transformer connect back first bridge rectifier circuit's input, the secondary winding of second of first transformer and the secondary winding of second transformer connect back second bridge rectifier circuit's input, the utility model discloses a two sets of transformer primary side series connection and secondary side crisscross and have established ties and realized that every winding power sharing of every transformer divides with the voltage stress of secondary side rectifier tube, current stress halving in every power unit, have improved the reliability of circuit.
Description
[ technical field ]
The utility model relates to a DCDC conversion especially relates to an LL C resonant mode DC/DC converter.
[ background art ]
In the field of conversion from high-power high-voltage direct current to direct current, in order to meet the requirements of small size, high power, safety and reliability, a topological structure for isolating high power density is needed, the LL C circuit can realize soft switching of a switching device in a full load range near a resonant switching frequency, and can realize smaller switching loss under the high switching frequency, the high switching frequency can reduce the size of a magnetic component, so that high power density is realized, the LL C circuit is applied more and more widely in the field of power electronics, but in the high-power application occasion, the size of a single magnetic component is increased, so that the size of the whole product is increased, and the whole design of the product is not facilitated.
The difficulty of the multi-component discrete magnetic component string and the multi-path topological string lies in the power balance, thermal design and component stress design of the multi-path string. Because the magnetic devices of the multi-path components are difficult to be completely consistent, the power imbalance of the power units of the multi-path strings is often caused by the difference of parasitic parameters of other switching devices and the like. The power imbalance may cause excessive heating of the overloaded power unit therein, which brings a risk of device damage and seriously affects the reliability of the whole circuit.
[ summary of the invention ]
The to-be-solved technical problem of the utility model is to provide an LL C resonant mode DC/DC converter that the reliability is good.
In order to solve the technical problem, the utility model discloses a technical scheme be, an LL C resonance type DC/DC converter, including three level switch circuit, three level switch circuit includes inverter circuit, resonance circuit and N power unit, power unit includes two the same isolation transformers and two the same bridge rectifier circuits, N be positive integer, resonance circuit's resonant capacitance, resonance inductance and all isolation transformer's primary side winding establish ties the back and connect inverter circuit's output, every isolation transformer includes two the same secondary winding, in same power unit, the first secondary winding of first isolation transformer and the first secondary winding of second isolation transformer connect back first bridge rectifier circuit's input, the second secondary winding of first isolation transformer and the second secondary winding of second isolation transformer connect back second bridge rectifier circuit's input, the output of first bridge rectifier circuit connects in series with first bridge rectifier circuit's output and is regarded as power unit's output.
When N > 1, the LL C resonant DC/DC converter described above connects the output terminals of all power cells in parallel.
The LL C resonant DC/DC converter comprises an inverter circuit, a three-level inverter circuit and a half-bridge inverter, wherein the upper arm and the lower arm of the half-bridge inverter respectively comprise two switching tubes, the voltage-dividing capacitor comprises two serially connected identical capacitors, the clamping circuit comprises two diodes, the voltage-dividing capacitor is connected between two DC input ports of the inverter circuit, the anode of the first diode is connected with the midpoint of the voltage-dividing capacitor, the cathode of the first diode is connected with the connection point of the upper arm of the half-bridge inverter and the two switching tubes, the cathode of the second diode is connected with the midpoint of the voltage-dividing capacitor, the anode of the second diode is connected with the connection point of the lower arm of the half-bridge inverter and the two switching tubes, and after the resonant capacitor and the resonant inductor of the resonant circuit are connected with the primary windings of all isolation transformers in series, one end of the resonant.
In the LL C resonant DC/DC converter, the bridge rectifier circuit includes a bridge circuit with four diodes, an output capacitor and a voltage-sharing resistor, the output capacitor is connected between two output ports of the bridge rectifier circuit, and the voltage-sharing resistor is connected in parallel with the output capacitor.
The LL C resonant DC/DC converter includes a plurality of three-level switch circuits, wherein the input terminals of the three-level switch circuits are connected in parallel, and the output terminals of the three-level switch circuits are connected in parallel.
The utility model discloses a primary side of N power unit is established ties, and vice limit is parallelly connected, realizes every power unit's power sharing. The primary sides of the two groups of transformers in each power unit are connected in series and the secondary sides of the two groups of transformers in staggered parallel connection in series, so that the power of each transformer is shared, the voltage stress and the current stress of the secondary side rectifier tubes are reduced by half, and the reliability of the circuit is improved.
[ description of the drawings ]
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a circuit diagram of a three-level LL C resonant DC/DC converter of a power cell according to embodiment 1 of the present invention.
Fig. 2 is a circuit diagram of a three-level LL C resonant DC/DC converter including two power cells according to embodiment 2 of the present invention.
Fig. 3 is a circuit diagram of a three-level LL C resonant DC/DC converter including a plurality of power cells according to embodiment 3 of the present invention.
Fig. 4 is a circuit diagram of another three-level LL C resonant type DC/DC converter of a power unit.
Fig. 5 is a circuit diagram of a three-level LL C resonant DC/DC converter including two three-level switch circuits according to embodiment 5 of the present invention.
[ detailed description of the invention ]
In order to realize high-power output and high power density of high voltage direct current to direct current, the utility model provides a many power unit group string formula three level LL C resonant DC/DC converter that can flow equalize automatically, DC/DC converter adopts three level LL C topology, realizes high efficiency output and low device stress.
The three-level LL C resonant converter combines the LL C series resonant converter and the three-level technology, and has the advantages of the LL C series resonant converter such as high power density and three-level converter, the voltage stress on the switching tube of the three-level LL C converter is half of the input voltage, and the problem that the input voltage is too high and a proper device is not easy to select can be well solved.
The utility model provides a current-sharing voltage-sharing of group's cluster of multiunit transformer and topological unit adopts the technical scheme that three level LL C topological input is direct current high voltage vin, three level LL C topological transformer primary side is the series connection of 2N transformer primary sides, has 2N transformers altogether, N is the positive integer, 2N transformer specification is identical completely, every transformer primary side has a winding, the secondary has two windings, two secondary winding turns inductance volume are equal, two transformers and secondary bridge rectifier filter circuit constitute a power unit, every power unit's primary side is established ties, the primary side current equals the output of every power unit is parallelly connected, output voltage equals, consequently can realize each power unit's current-sharing and power balance.
The primary windings of the two isolation transformers are connected in series, and the two windings of the first transformer are respectively connected with the two windings of the second transformer in parallel. The two windings connected in parallel are respectively connected with two bridge rectifier circuits, and the output ends of the bridge rectifier circuits are respectively connected with an output capacitor and a voltage-sharing resistor. The two groups of parallel rectification filters are connected in series. The two groups of series-connected voltages are Vo1 and Vo2, and the capacitance values of the capacitors and the resistance values of the voltage-sharing resistors which are connected in series are the same. The two parallel windings in each group have the same voltage, the turn ratio of the two windings on the secondary side of each transformer is the same, and the winding voltages are also the same, so that the voltage equalization of the two groups of series-connected voltages Vo1 and Vo2 is realized. The primary windings of the two transformers are connected in series with the same current, so that each secondary winding realizes current equalization and power equalization, and the power equalization and the heat equalization of the two transformers are realized.
The output power balance of the whole topology circuit can be automatically realized through the current-sharing power balance in the power units and the current-sharing power balance among the power units.
An embodiment of the present invention is a three-level LL C switch circuit with a power unit shown in fig. 1, wherein Vin is a high-voltage dc input, voltage-dividing capacitors C1, C2, diodes D1, D2, switch tubes Q1, Q2, Q3, Q4, resonant capacitor Cr, resonant inductor L r and the primary side of the transformer constitute a three-level LL C primary side circuit, and the three-level LL C circuit is characterized in that the three-level switch tubes Q1, Q2, Q3, Q4 bear voltages
In the embodiment of fig. 2, two power cells M1, M2 are included. The power unit is formed in accordance with the circuit. In the power unit M1, two identical parameter transformers T1, T2 are included. Each transformer is provided with a primary winding and two secondary windings, and the number of turns of the two secondary windings is consistent with the inductance. The primary winding n1_1 of T1 is connected in series with the primary n2_1 of T2, so the primary current i1_1 of T1 is equal to the primary current i2_1 of T2. The primary and secondary side current relationship of the transformer meets the requirements that i1_2 is i1_3 is n i1_1, wherein n is the primary and secondary side turn ratio. Since the primary currents are equal and the turn ratios are equal, i1_ 2-i 1_ 3-i 2_ 2-i 2_ 3-i 3_ 2-i 3_ 3-i 4_ 2-i 4_ 3. The number of turns of the two secondary windings of the transformer is equal at T1, so that the two secondary winding voltages satisfy Vn1_ 2-Vn 1_ 3. Likewise, the voltages of the two secondary windings of the T2 transformer satisfy Vn2_2 ═ Vn2_ 3. The secondary winding n1_2 of T1 and the secondary winding n2_2 of T2 are connected in parallel, the secondary winding n1_3 of T1 and the secondary winding n2_3 of T2 are connected in parallel, the voltages of the parallel windings are equal, therefore, the voltage Vn1_3 of the secondary winding n1_3 of T1 and the voltage Vn2_3 of the secondary winding n2_3 of T2 meet Vn1_ 3-Vn 2_ 3. Likewise, the two other winding voltages satisfy Vn1_2 ═ Vn2_ 2. Therefore, all the secondary winding voltages of the transformer of the same power unit satisfy the relation of Vn1_ 2-Vn 2_ 2-Vn 1_ 3-Vn 2_ 3. Therefore, the current-sharing and voltage-sharing of the secondary winding of each transformer in each power unit can be obtained, and the power balance can be realized. The secondary winding n1_2 of the T1 and the secondary winding n2_2 of the T2 are connected in parallel and then connected with a bridge rectifier D11 consisting of four diodes, the rectified output of the D11 is connected with a capacitor C11 and a resistor R11, and the voltage at the two ends of the C11 and the R11 is Vo 1. Since the secondary winding voltage in each power cell is the same, Vo 1-Vo 2 can be obtained. The circuit structures of M2 and M1 are completely the same, the primary side of M2 is connected with the primary side of M1 in series, the current of the primary side and the current of the secondary side are the same, the primary side rectified output of M2 is connected with the primary side rectified output of M1 in parallel, and the voltage of the secondary side is the same, so that the current-sharing and voltage-sharing of M1 and M2 and power balancing can be realized.
In fig. 1, only one power unit M1 is identical to M1 in fig. 2, in fig. 4, it is another three-level LL C circuit with only one power unit, in the circuit of fig. 4, the two primary transformer windings are connected in series, the two secondary windings of the transformer T1 are connected in parallel and then connected to a bridge rectifier D11 consisting of four diodes, the rectifier output of D11 is connected to a capacitor C11 and a resistor R11, and the voltages across C11 and R11 are vo1, the two secondary windings of the transformer T11 are connected in parallel and then connected to a bridge rectifier D11 consisting of four diodes, the rectifier output of D11 is connected to a capacitor C11 and a resistor R11, the voltages across C11 and R11 are Vo 11, the two secondary windings of the transformer T11 in fig. 4, the two secondary windings of the transformer T11 are connected in series to the output voltage 11, the two secondary windings of the transformer T11 and the transformer T11 are not guaranteed to be identical, but the voltages across the two secondary windings of the transformer T11 and the two secondary windings of the transformer T11 are not guaranteed to be identical, i.e.
In fig. 3, a three-level LL C circuit with multiple power units is shown, wherein a circuit has N power units, N is a positive integer greater than 1, primary transformer windings are connected in series, outputs of the power units are connected in parallel, the circuit composition of each power unit is the same as that of the power unit in fig. 2, the multiple power units are connected in parallel to realize power sharing, design of magnetic components is facilitated, stress of the components is reduced, and integration of high power density is facilitated.
In fig. 5, the three-level switch circuit (power module) S and S ' Is composed of two three-level switch circuits (power modules) S and S ', the internal components of the two modules are completely consistent and are completely consistent with the circuit shown in fig. 2, the two power modules are connected in parallel in input and in parallel in output, the three-level LL C of the two modules Is controlled by software to drive wave generation by detecting primary side currents Is and Is ' of transformers in the two modules, real-time current equalization of the primary side currents Is and Is ' of the transformers in the two modules Is realized, power equalization of the two power modules S and S ' Is realized, and the realization of current equalization, voltage equalization and power equalization in the power modules Is consistent with the circuit shown in fig.
The utility model discloses above embodiment realizes the demand of high pressure input through three-level LL C topology, every switch tube voltage stress subtracts half, establish ties through N power unit's primary side, the vice limit is parallelly connected, realize every power unit's power sharing, establish ties through two sets of transformer primary sides in every power unit and the crisscross parallel cluster of vice limit has realized the power sharing of every transformer, and the voltage stress of vice limit rectifier tube, current stress subtracts half, and this topology can realize every power unit's power balance through this kind of many power unit group string formula design, the reliability of circuit has been improved.
While embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limiting the present invention. Variations, modifications, substitutions and alterations of the above-described embodiments will occur to those of ordinary skill in the art without departing from the scope of the present invention.
Claims (5)
1. An LL C resonant DC/DC converter is characterized by comprising a three-level switch circuit, wherein the three-level switch circuit comprises an inverter circuit, a resonance circuit and N power units, each power unit comprises two identical isolation transformers and two identical bridge rectifier circuits, N is a positive integer, a resonance capacitor and a resonance inductor of the resonance circuit are connected with the output ends of the inverter circuit after being connected with primary windings of all the isolation transformers in series, each isolation transformer comprises two identical secondary windings, in the same power unit, a first secondary winding of a first isolation transformer and a first secondary winding of a second isolation transformer are connected in parallel to form the input end of a first bridge rectifier circuit, a second secondary winding of the first isolation transformer and a second secondary winding of the second isolation transformer are connected in parallel to form the input end of a second rectifier circuit, and the output end of the first bridge rectifier circuit and the output end of the second bridge rectifier circuit are connected in series to form the output end of the power unit.
2. An LL C resonant type DC/DC converter according to claim 1, wherein when N > 1, the output terminals of all power cells are connected in parallel.
3. The LL C resonant DC/DC converter according to claim 1, wherein the three-level switching circuit comprises a voltage-dividing capacitor, a clamping circuit and a half-bridge inverter, the upper arm and the lower arm of the half-bridge inverter each comprise two switching tubes, the voltage-dividing capacitor comprises two serially connected identical capacitors, the clamping circuit comprises two diodes, the voltage-dividing capacitor is connected between the two DC input ports of the inverter circuit, the anode of the first diode is connected to the midpoint of the voltage-dividing capacitor, the cathode of the first diode is connected to the connection point of the upper arm and the two switching tubes of the half-bridge inverter, the cathode of the second diode is connected to the midpoint of the voltage-dividing capacitor, the anode of the second diode is connected to the connection point of the lower arm and the two switching tubes of the half-bridge inverter, the resonant capacitor and the resonant inductor of the resonant circuit are connected in series with the primary windings of all the isolation transformers.
4. An LL C resonant DC/DC converter according to claim 1, wherein the bridge rectifier circuit comprises a four-diode bridge circuit, an output capacitor connected between two output ports of the bridge rectifier circuit, and a voltage-sharing resistor connected in parallel with the output capacitor.
5. The LL C resonant DC/DC converter according to claim 1, comprising a plurality of said three-level switching circuits connected in parallel at their input ends and at their output ends.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922303034.9U CN211183801U (en) | 2019-12-20 | 2019-12-20 | LL C resonant DC/DC converter |
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| CN201922303034.9U CN211183801U (en) | 2019-12-20 | 2019-12-20 | LL C resonant DC/DC converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113676058A (en) * | 2021-07-29 | 2021-11-19 | 浙江大学杭州国际科创中心 | Voltage-sharing device of power conversion module and power conversion system |
| WO2022052074A1 (en) * | 2020-09-14 | 2022-03-17 | Huawei Technologies Co., Ltd. | Dc/dc power converter, method for controlling switching thereof, dc/dc power converter arrangement and system |
| TWI810892B (en) * | 2021-04-15 | 2023-08-01 | 愛爾蘭商艾塞爾西斯科技有限公司 | Resonant converter circuit, power supply unit, and system of resonant converter |
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2019
- 2019-12-20 CN CN201922303034.9U patent/CN211183801U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022052074A1 (en) * | 2020-09-14 | 2022-03-17 | Huawei Technologies Co., Ltd. | Dc/dc power converter, method for controlling switching thereof, dc/dc power converter arrangement and system |
| TWI810892B (en) * | 2021-04-15 | 2023-08-01 | 愛爾蘭商艾塞爾西斯科技有限公司 | Resonant converter circuit, power supply unit, and system of resonant converter |
| CN113676058A (en) * | 2021-07-29 | 2021-11-19 | 浙江大学杭州国际科创中心 | Voltage-sharing device of power conversion module and power conversion system |
| CN113676058B (en) * | 2021-07-29 | 2023-09-05 | 浙江大学杭州国际科创中心 | Voltage equalizing device of power conversion module and power conversion system |
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Effective date of registration: 20210914 Address after: 518000 101, block B, building a, Jingfa zhizaoyuan, Xiawei community, Xixiang street, Bao'an District, Shenzhen, Guangdong Province Patentee after: Shenzhen Energy Efficiency Electrical Technology Co.,Ltd. Address before: 518000 south of Baotian 1st Road, Xixiang street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: GOSPOWER DIGITAL TECHNOLOGY (SHENZHEN) Co.,Ltd. |