CN211127586U - LL C resonant transformation circuit - Google Patents
LL C resonant transformation circuit Download PDFInfo
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- CN211127586U CN211127586U CN201922124607.1U CN201922124607U CN211127586U CN 211127586 U CN211127586 U CN 211127586U CN 201922124607 U CN201922124607 U CN 201922124607U CN 211127586 U CN211127586 U CN 211127586U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The embodiment of the utility model provides an LL C resonance converting circuit, this circuit includes first transform unit, second transform unit, first resonance unit, second resonance unit, first transformer, second transformer, switch element and third transform unit, the former limit of first transformer is connected with DC bus through first transform unit and first resonance unit, the second transformer is connected with DC bus through second transform unit, second resonance unit and switch element, and change through adjusting the on-off state of switch element the second transformer with the connection state between the DC bus, the secondary of first transformer and the secondary series connection back of second transformer are connected to the input of third transform unit, the LL C resonance converting circuit of the embodiment of the utility model can switch input power level, satisfy the requirement to output power under the different input currents.
Description
Technical Field
The utility model relates to an electronic power field especially relates to an LL C resonance converting circuit.
Background
LL C resonant converter has good soft switching characteristic, high efficiency, and wide application, with the continuous development of power electronic technology, high frequency, low cost, and high efficiency become the direction of continuous development, traditional full-bridge LL C resonant converter as shown in FIG. 1, can realize wide voltage range by adopting frequency conversion control mode.
When the LL C resonant converter is used as a rear stage of a PFC (Power Factor Correction) circuit, because the PFC circuit has two working modes of three-phase electricity and single-phase electricity, the LL C resonant converter needs to be compatible with different powers output by the front stage in the two working modes.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a to above-mentioned when these two kinds of power level differences are great, the problem that efficiency is up to standard under the two kinds of mode can't be guaranteed to traditional LL C resonant converter, provides a LL C resonant transformation circuit.
The embodiment of the utility model provides a technical scheme who solves above-mentioned technical problem adopts provides an LL C resonance converting circuit, including first transform unit, second transform unit, first resonance unit, second resonance unit, first transformer, second transformer, switch element and third transform unit, the primary side of first transformer is connected with direct current bus via first transform unit and first resonance unit, the second transformer via second transform unit, second resonance unit and switch element with direct current bus is connected, and through adjusting the on-off state of switch element changes the second transformer with the connection status between the direct current bus, the vice limit of first transformer with the vice limit series connection back of second transformer, be connected to the input of third transform unit.
Preferably, the third transforming unit includes a first filter capacitor and a second filter capacitor, and two input ends of the third transforming unit are respectively connected to a head end of a secondary side of the first transformer and a tail end of a secondary side of the second transformer, and the first filter capacitor and the second filter capacitor are connected in series between a positive output end and a negative output end of the third transforming unit; and the connection point of the first filter capacitor and the second filter capacitor forms an intermediate potential point, and the head end of the secondary side of the first transformer and the tail end of the secondary side of the second transformer are respectively connected to the intermediate potential point.
Preferably, the switching unit includes a relay or a switching tube, and the relay or the switching tube is connected in series between the first input end of the second conversion unit and the positive dc bus; and the control end of the relay or the switch tube is connected with the front end control unit, and the switch state is changed according to the control signal of the front end control unit.
Preferably, the switching unit includes a relay or a switching tube, and the relay or the switching tube is connected in series between the second input end of the second conversion unit and the negative dc bus; and the control end of the relay or the switch tube is connected with the front end control unit, and the switch state is changed according to the control signal of the front end control unit.
Preferably, the switching unit includes a relay or a switching tube connected in series between the output end of the second resonance unit and the head end of the second transformer; and the control end of the relay or the switch tube is connected with the front end control unit, and the switch state is changed according to the control signal of the front end control unit.
Preferably, the switching unit includes a relay or a switching tube connected in series between the output end of the second transforming unit and the tail end of the second transformer; and the control end of the relay or the switch tube is connected with the front end control unit, and the switch state is changed according to the control signal of the front end control unit.
Preferably, the first conversion unit includes a first bridge arm and a second bridge arm, and the first bridge arm and the second bridge arm are connected in parallel between the positive dc bus and the negative dc bus; the midpoint of the first bridge arm is connected to the head end of the primary side of the first transformer via the first resonance unit, and the midpoint of the second bridge arm is connected to the tail end of the primary side of the first transformer.
Preferably, the second conversion unit includes a third leg and a fourth leg, and the third leg and the fourth leg are connected in parallel between the positive dc bus and the negative dc bus; the midpoint of the third bridge arm is connected to the input end of the second resonance unit, and the midpoint of the fourth bridge arm is connected to the tail end of the primary side of the second transformer.
Preferably, the third conversion unit includes a fifth bridge arm and a sixth bridge arm, and the fifth bridge arm and the sixth bridge arm are connected in parallel between the positive output end and the negative output end; the midpoint of the fifth bridge arm is connected with the head end of the secondary side of the first transformer, and the midpoint of the sixth bridge arm is connected with the tail end of the secondary side of the second transformer.
Preferably, the first resonance unit includes a first capacitor and a first inductor, and the first capacitor and the first inductor are sequentially connected in series between a midpoint of the first bridge arm and a head end of a primary side of the first transformer;
the second resonance unit comprises a second capacitor and a second inductor, and the second capacitor and the second inductor are sequentially connected in series to the midpoint of the third bridge arm and the head end of the primary side of the second transformer.
The embodiment of the utility model provides an LL C resonance converting circuit switches input power level through the primary side of control second transformer T2 losing power to increase or reduce and satisfy output, can compatible input three-phase alternating current or the condition of single-phase alternating current, satisfy the requirement to output under the different input current.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a circuit diagram of a conventional LL C resonant converter;
fig. 2 is a circuit diagram of an LL C resonant conversion circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of an LL C resonant conversion circuit according to another embodiment of the present invention;
fig. 4 is a circuit diagram of an LL C resonant conversion circuit according to another embodiment of the present invention;
fig. 5 is a circuit diagram of an LL C resonant conversion circuit according to another embodiment of the present invention;
fig. 6 is a circuit diagram of an LL C resonant conversion circuit according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Fig. 2 is a block diagram of a LL C resonant converter circuit according to the present invention, wherein an input terminal of the LL C resonant converter circuit is connectable to a power grid via a PFC circuit, as shown in fig. 2, the LL C resonant converter circuit includes a first converter unit 10, a second converter unit 20, a third converter unit 30, a first resonator unit 40, a second resonator unit 50, a first transformer T1, a second transformer T2, and a switch unit, wherein a primary side of the first transformer T1 is connected to a dc bus (e.g., an output terminal of the PFC circuit) via the first converter unit 10 and the first resonator unit 40, a secondary transformer T2 is connected to the dc bus (e.g., an output terminal of the PFC circuit) via the second converter unit 20, the second resonator unit 50, and the switch unit, and a primary side of the second transformer T2 is changed by adjusting a switching state of the switch unit, for example, the primary side of the second transformer T2 is deenergized when the switch unit is disconnected, the secondary side of the second transformer T48335 is connected to a secondary side of the second transformer T1, and a secondary side of the second transformer T4630 is connected in series after the switch unit is adjusted.
In the circuit, single-phase alternating current or three-phase alternating current is converted into direct current through a PFC circuit and then is input into the first conversion unit 10 and the second conversion unit 20, wherein the switch unit can change the switch state according to a front-end control signal (the front-end control signal is generated by detecting LL C resonant conversion circuit operation environment through the front-end control unit), so that the LL C resonant conversion circuit of the embodiment works in different states and meets different power levels.
The LL C resonant converter circuit can meet the requirements of different power levels by controlling the link between the primary side of the second transformer T2 and the dc bus, and certainly, in practical applications, the switch unit can also be arranged between the primary side of the first transformer T1 and the dc bus.
In the above circuit, whether the primary side of the second transformer T2 loses power can be realized by controlling the connection between the dc bus and the second transformer T2. When the connection between the dc bus and the second conversion unit 20 is conductive, the primary side of the second transformer T2 operates (i.e., no power loss); when the connection between the dc bus and the second transformer T2 is broken, the primary side of the second transformer T2 loses power. In a specific implementation, the switching unit may be disposed between the dc bus and the input terminal of the second conversion unit 20, or disposed between the output terminal of the second conversion unit 20 and the primary side of the second transformer T2.
Specifically, the switch unit may include a switch tube Q (of course, in practical applications, the switch tube Q may be replaced by a contactor, a single-pole single-throw switch, a manual jumper switch, or the like, and the switch tube Q will be described as an example below). The switch tube may be placed at a plurality of positions, for example, the switch tube Q is connected in series between the first input terminal of the second conversion unit 20 and the positive dc bus Vbus + (as shown in fig. 3); or the switching tube Q is connected in series between the second input terminal of the second conversion unit 20 and the negative dc bus Vbus- (as shown in fig. 4); the switching tube Q may also be connected in series between the output terminal of the second resonance unit 50 and the head end of the second transformer T2 (as shown in fig. 5); the switching tube Q may also be connected in series between the output terminal of the second transforming unit 20 and the tail end of the second transformer T2 (as shown in fig. 6). The control end of the switching tube Q is connected to the front-end control unit, and the switching state is adjusted according to the output signal of the front-end control unit.
When the switching tube Q is disconnected, the connection between the dc bus and the second transformer T2 is disconnected, so that the primary side of the second transformer T2 loses power; when the switching tube Q is turned on, the connection between the dc bus and the second transformer T2 is turned on, so that the primary side of the second transformer T2 operates normally (i.e., no power loss occurs).
Specifically, the first conversion unit 10 may include a first bridge arm and a second bridge arm, and the first bridge arm and the second bridge arm are connected in parallel between a positive dc bus Vbus + and a negative dc bus Vbus-; midpoint N1 of the first leg is connected to the input of first resonant cell 40, the output of first resonant cell 40 is connected to the head end of the primary side of first transformer T1, and midpoint N2 of the second leg is connected to the tail end of the primary side of first transformer T1. The first bridge arm may include an upper bridge arm and a lower bridge arm connected in series, and the second bridge arm may include an upper bridge arm and a lower bridge arm connected in series. The midpoint N1 of the first leg may be a connection point of the upper leg and the lower leg of the first leg, and the midpoint N2 of the second leg may be a connection point of the upper leg and the lower leg of the second leg.
The second conversion unit 20 may include a third leg and a fourth leg, and the third leg and the fourth leg are connected in parallel between the positive dc bus Vbus + and the negative dc bus Vbus-; the midpoint N3 of the third leg is connected to the input of the second resonant cell 50 and the midpoint N4 of the fourth leg is connected to the tail end of the primary side of the second transformer T2. The third bridge arm may include an upper bridge arm and a lower bridge arm connected in series, and the fourth bridge arm may include an upper bridge arm and a lower bridge arm connected in series. A midpoint N3 of the third leg may be a connection point of the upper leg and the lower leg of the third leg, and a midpoint N4 of the fourth leg may be a connection point of the upper leg and the lower leg of the fourth leg.
The third converting unit 30 includes a fifth arm and a sixth arm, and the fifth arm and the sixth arm are connected in parallel between the positive output terminal VH + and the negative output terminal VH-; midpoint N5 of the fifth leg is connected to the head end of the secondary side of first transformer T1, and midpoint N6 of the sixth leg is connected to the tail end of the secondary side of second transformer T2. The fifth bridge arm may include an upper bridge arm and a lower bridge arm connected in series, and the sixth bridge arm may include an upper bridge arm and a lower bridge arm connected in series. The midpoint N5 of the fifth arm is specifically a connection point of the upper arm and the lower arm of the fifth arm, and the midpoint N6 of the sixth arm is specifically a connection point of the upper arm and the lower arm of the sixth arm.
Each of the upper arm and the lower arm of the first converting unit 10, the second converting unit 20, and the third converting unit 30 may be formed by a power switching tube, and the on/off of the upper arm and the lower arm may be controlled by a Pulse Width Modulation (PWM) signal.
In the circuit, the first resonant unit 40 may include a first capacitor C1 and a first inductor L1, the first capacitor C1 and the first inductor L1 are sequentially connected in series between the midpoint N1 of the first leg and the head end of the primary side of the first transformer T1, the second resonant unit 50 may include a second capacitor C2 and a second inductor L2, and the second capacitor C2 and the second inductor L2 are sequentially connected in series between the midpoint N3 of the third leg and the head end of the primary side of the second transformer T2, and the circuit may further implement power level switching by reasonably setting the capacitance values of the first capacitor C1 and the second capacitor C3, and the inductance values of the first inductor L1 and the second inductor L2.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. An LL C resonant conversion circuit is characterized by comprising a first conversion unit, a second conversion unit, a first resonant unit, a second resonant unit, a first transformer, a second transformer, a switch unit and a third conversion unit, wherein the primary side of the first transformer is connected with a direct current bus through the first conversion unit and the first resonant unit, the second transformer is connected with the direct current bus through the second conversion unit, the second resonant unit and the switch unit, the connection state between the second transformer and the direct current bus is changed by adjusting the switch state of the switch unit, and the secondary side of the first transformer is connected with the secondary side of the second transformer in series and then is connected to the input end of the third conversion unit.
2. The LL C resonant conversion circuit of claim 1, wherein the third conversion unit includes a first filter capacitor and a second filter capacitor, and two input terminals of the third conversion unit are connected to a head end of the secondary side of the first transformer and a tail end of the secondary side of the second transformer, respectively, the first filter capacitor and the second filter capacitor are connected in series between a positive output terminal and a negative output terminal of the third conversion unit, a connection point of the first filter capacitor and the second filter capacitor constitutes an intermediate potential point, and the head end of the secondary side of the first transformer and the tail end of the secondary side of the second transformer are connected to the intermediate potential point, respectively.
3. The LL C resonant conversion circuit of claim 1 or 2, wherein the switch unit comprises a relay or a switch tube, the relay or the switch tube is connected in series between the first input end of the second conversion unit and the positive direct current bus, and the control end of the relay or the switch tube is connected with the front end control unit and changes the switch state according to the control signal of the front end control unit.
4. The LL C resonant conversion circuit of claim 1 or 2, wherein the switch unit comprises a relay or a switch tube, the relay or the switch tube is connected in series between the second input end of the second conversion unit and the negative DC bus, and the control end of the relay or the switch tube is connected with the front end control unit and changes the switch state according to the control signal of the front end control unit.
5. The LL C resonant conversion circuit of claim 1 or 2, wherein the switch unit comprises a relay or a switch tube connected in series between the output terminal of the second resonant unit and the head end of the second transformer, and the control terminal of the relay or the switch tube is connected with the front end control unit and changes the switch state according to the control signal of the front end control unit.
6. The LL C resonant conversion circuit of claim 1 or 2, wherein the switch unit comprises a relay or a switch tube connected in series between the output terminal of the second conversion unit and the tail end of the second transformer, and the control terminal of the relay or the switch tube is connected with the front end control unit and changes the switch state according to the control signal of the front end control unit.
7. The LL C resonant conversion circuit of claim 1, wherein the first conversion unit comprises a first leg and a second leg connected in parallel between a positive DC bus and a negative DC bus, a midpoint of the first leg is connected to a head end of the primary side of the first transformer via the first resonant unit, and a midpoint of the second leg is connected to a tail end of the primary side of the first transformer.
8. The LL C resonant conversion circuit of claim 7, wherein the second conversion unit comprises a third leg and a fourth leg, the third leg and the fourth leg are connected in parallel between a positive DC bus and a negative DC bus, a midpoint of the third leg is connected to an input terminal of the second resonant unit, and a midpoint of the fourth leg is connected to a tail end of a primary side of the second transformer.
9. The LL C resonant conversion circuit of claim 1, wherein the third conversion unit comprises a fifth leg and a sixth leg connected in parallel between a positive output terminal and a negative output terminal, a midpoint of the fifth leg is connected to a head end of the secondary side of the first transformer, and a midpoint of the sixth leg is connected to a tail end of the secondary side of the second transformer.
10. The LL C resonant conversion circuit of claim 8, wherein the first resonant unit includes a first capacitor and a first inductor, and the first capacitor and the first inductor are sequentially connected in series between the midpoint of the first leg and the head end of the primary side of the first transformer;
the second resonance unit comprises a second capacitor and a second inductor, and the second capacitor and the second inductor are sequentially connected in series to the midpoint of the third bridge arm and the head end of the primary side of the second transformer.
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|---|---|---|---|
| CN201922124607.1U CN211127586U (en) | 2019-12-02 | 2019-12-02 | LL C resonant transformation circuit |
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| CN201922124607.1U CN211127586U (en) | 2019-12-02 | 2019-12-02 | LL C resonant transformation circuit |
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| CN211127586U true CN211127586U (en) | 2020-07-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023246061A1 (en) * | 2022-06-20 | 2023-12-28 | Oppo广东移动通信有限公司 | Transformer circuit, voltage conversion circuit, electronic device, and circuit starting method |
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2019
- 2019-12-02 CN CN201922124607.1U patent/CN211127586U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023246061A1 (en) * | 2022-06-20 | 2023-12-28 | Oppo广东移动通信有限公司 | Transformer circuit, voltage conversion circuit, electronic device, and circuit starting method |
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Address after: 215000 52 tianedang Road, Yuexi, Wuzhong District, Suzhou City, Jiangsu Province Patentee after: Suzhou Huichuan United Power System Co.,Ltd. Address before: 215000 52 tianedang Road, Yuexi Town, Wuzhong District, Suzhou City, Jiangsu Province Patentee before: SUZHOU HUICHUAN UNITED POWER SYSTEM Co.,Ltd. |
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