CN201118448Y

CN201118448Y - Step-up and step-down circuit of autotransformer

Info

Publication number: CN201118448Y
Application number: CNU2007201934733U
Authority: CN
Inventors: 黄明和
Original assignee: Gaoxiao Electronic Co ltd
Current assignee: Chicony Power Technology Co Ltd
Priority date: 2007-11-22
Filing date: 2007-11-22
Publication date: 2008-09-17
Anticipated expiration: 2017-11-22

Abstract

The utility model provides an autotransformer step-down circuit, it has: a first transformer having a first winding, a second winding and a third winding; a first switch having a first voltage (V1) output at one end; a second switch; a second transformer; a third switch having a second voltage (V2) output at one end; a fourth switch; a fifth switch having a third voltage (V3) output at one end; and a sixth switch; by the structure, a plurality of groups of voltage outputs are achieved. In addition, the utility model discloses also provide an autotransformer step-up and step-down circuit, it can reach multiunit voltage output also.

Description

Autotransformer buck-boost circuit

技术领域 technical field

本实用新型是有关于一种自耦变压器升降压电路，尤指一种使用一自耦变压器执行升压及降压，以达到多组电压输出的自耦变压器升降压电路。The utility model relates to an autotransformer step-up and step-down circuit, in particular to an autotransformer step-up and step-down circuit which uses an autotransformer to perform step-up and step-down to achieve multiple sets of voltage output.

背景技术 Background technique

已知的LLC谐振转换器电路中，其二次侧通常以中间抽头的方式输出一+12V、+ V或+3.3V等电压输出。惟上述的已知LLC谐振转换器电路，当其中一组电压输出侧的负载产生变化时，将对其他组电压输出产生交互调整(cross regulation)的作用，例如当+12V上的负载变重时，将连带使+5V及+3.3V电压输出侧的电压输出产生变化，或者当+5V上的负载变重时，将连带使+12V及+3.3V电压输出侧的电压输出产生变化。如此，将使三组电压输出间互相影响，而使情况变得复杂，诚属美中不足之处。In the known LLC resonant converter circuit, its secondary side usually outputs a voltage output such as +12V, +V or +3.3V in the form of a center tap. However, in the above-mentioned known LLC resonant converter circuit, when the load on one of the voltage output sides changes, it will have a cross regulation effect on the other groups of voltage outputs, for example, when the load on +12V becomes heavy , the voltage output on the +5V and +3.3V voltage output side will be changed jointly, or when the load on the +5V becomes heavy, the voltage output on the +12V and +3.3V voltage output side will be changed jointly. In this way, the three groups of voltage outputs will interact with each other, and the situation will become complicated, which is really a fly in the ointment.

有鉴于此，本实用新型提出一种自耦变压器升降压电路以改善上述缺点。In view of this, the utility model proposes an autotransformer buck-boost circuit to improve the above shortcomings.

实用新型内容Utility model content

本实用新型的一目的是提供一种自耦变压器降压电路，其使用一自耦变压器执行降压，以达到多组输出的目的。An object of the present invention is to provide an autotransformer step-down circuit, which uses an autotransformer to perform step-down, so as to achieve the purpose of multi-group output.

本实用新型的另一目的是提供一种自耦变压器降压电路，其使用一自耦变压器执行升压及降压，以达到多组电压输出的目的。Another object of the present invention is to provide an autotransformer step-down circuit, which uses an autotransformer to perform step-up and step-down, so as to achieve the purpose of outputting multiple sets of voltages.

为达上述的目的，本实用新型的一种自耦变压器降压电路，是用于LLC谐振转换器中，其特征在于，其具有：For reaching above-mentioned purpose, a kind of autotransformer step-down circuit of the present utility model is used in LLC resonant converter, it is characterized in that, it has:

一第一变压器，其具有一一次侧及一二次侧，该一次侧具有一第一绕组，该二次侧具有一第二绕组及一第三绕组，且该第二绕组及第三绕组互相串接，该第二绕组及第三绕组之间则接至地电位，该第一绕组的一端耦接至该LLC谐振转换器的输出端；A first transformer having a primary side and a secondary side, the primary side has a first winding, the secondary side has a second winding and a third winding, and the second winding and the third winding connected in series, the second winding and the third winding are connected to ground potential, and one end of the first winding is coupled to the output end of the LLC resonant converter;

一第一开关，其一端耦接至该第二绕组，该第二绕组的另一端与该第一开关的另一端间则具有一第一电压(V1)输出；A first switch, one end of which is coupled to the second winding, and a first voltage (V1) output between the other end of the second winding and the other end of the first switch;

一第二开关，其一端耦接至该第三绕组的另一端，另一端则耦接至该第一开关的另一端；a second switch, one end of which is coupled to the other end of the third winding, and the other end is coupled to the other end of the first switch;

一第二变压器，其具有一第一绕组、第二绕组、第三绕组、第四绕组、第五绕组及第六绕组，该第一绕组的一端耦接至该第一变压器的第二绕组，该第六绕组的另一端耦接至该第一变压器的第三绕组的另一端，该第三绕组及第四绕组之间则接至地电位；a second transformer having a first winding, a second winding, a third winding, a fourth winding, a fifth winding and a sixth winding, one end of the first winding is coupled to the second winding of the first transformer, The other end of the sixth winding is coupled to the other end of the third winding of the first transformer, and the third winding and the fourth winding are connected to ground potential;

一第三开关，其一端耦接至该第二变压器的第一绕组及第二绕组之间，另一端则具有一第二电压(V2)输出；a third switch, one end of which is coupled between the first winding and the second winding of the second transformer, and the other end has a second voltage (V2) output;

一第四开关，其一端耦接至该第二变压器的第二绕组及第三绕组之间；a fourth switch, one end of which is coupled between the second winding and the third winding of the second transformer;

一第五开关，其一端耦接至该第二变压器的第四绕组及第五绕组之间，另一端则耦接至该第四开关的另一端且具有一第三电压(V3)输出；以及a fifth switch, one end of which is coupled between the fourth winding and the fifth winding of the second transformer, and the other end is coupled to the other end of the fourth switch and has a third voltage (V3) output; and

一第六开关，其一端耦接至该第二变压器的第五绕组及第六绕组之间，另一端则耦接至该第三开关的另一端；a sixth switch, one end of which is coupled between the fifth winding and the sixth winding of the second transformer, and the other end is coupled to the other end of the third switch;

该第二电压输出及该第三电压输出不会随着该第一电压输出的负载变化而改变。The second voltage output and the third voltage output will not change as the load of the first voltage output changes.

其中该第二变压器为一自耦变压器。Wherein the second transformer is an autotransformer.

其中该第一开关、第二开关、第三开关、第四开关、第五开关及第六开关为一整流器或电力开关，且该电力开关为N通道金属氧化半场效应晶体管N通道接面场效应晶体管、P通道金属氧化半场效应晶体管或P通道接面场效应晶体管。Wherein the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch are a rectifier or a power switch, and the power switch is an N-channel MOSFET N-channel junction field Effect transistor, P-channel Metal Oxide Half Field Effect Transistor or P-channel Junction Field Effect Transistor.

其中该第一变压器的第一绕组具有N1圈数，第二绕组及第三绕组具有N2圈数，该第二变压器的第一绕组及第六绕组具有N5圈数，第二绕组及第五绕组具有N4圈数，第三绕组及第四绕组具有N3圈数。Wherein the first winding of the first transformer has N1 turns, the second winding and the third winding have N2 turns, the first winding and the sixth winding of the second transformer have N5 turns, the second winding and the fifth winding It has N4 turns, and the third winding and the fourth winding have N3 turns.

其中该第二电压where the second voltage

$V V 22 = = \frac{N N 33 + + N N 44}{N N 33 + + N N 44 + + N N 55} \times \times V V 11,,$

该第三电压The third voltage

$V V 33 = = \frac{N N 33}{N N 33 + + N N 44 + + N N 55} \times \times V V 11 . .$

为达上述的目的，本实用新型的一种自耦变压器升降压电路，是用于LLC谐振转换器中，其特征在于，其具有：For reaching above-mentioned purpose, a kind of autotransformer step-down circuit of the present invention is used in LLC resonant converter, it is characterized in that, it has:

一第一变压器，其具有一一次侧及一二次侧，该一次侧具有一第一绕组，该二次侧具有一第二绕组、一第三绕组、一第四绕组及一第五绕组，且该第二绕组、第三绕组、第四绕组及第五绕组互相串接，该第一绕组的一端耦接至该LLC谐振转换器的输出端；A first transformer having a primary side and a secondary side, the primary side has a first winding, the secondary side has a second winding, a third winding, a fourth winding and a fifth winding , and the second winding, the third winding, the fourth winding and the fifth winding are connected in series, and one end of the first winding is coupled to the output end of the LLC resonant converter;

一第二变压器，其具有一第一绕组、第二绕组、第三绕组、第四绕组、第五绕组及第六绕组，该第一绕组的一端耦接至该第一变压器的第二绕组，该第六绕组的一端耦接至该第一变压器的第五绕组的另一端，该第三绕组及第四绕组之间则接至地电位；a second transformer having a first winding, a second winding, a third winding, a fourth winding, a fifth winding and a sixth winding, one end of the first winding is coupled to the second winding of the first transformer, One end of the sixth winding is coupled to the other end of the fifth winding of the first transformer, and the third winding and the fourth winding are connected to ground potential;

一第一开关，其一端耦接至该第二变压器的第二绕组的另一端，另一端则具有一第一电压(V1)输出；a first switch, one end of which is coupled to the other end of the second winding of the second transformer, and the other end has a first voltage (V1) output;

一第二开关，其一端耦接至该第二变压器的第二绕组的一端及该第一变压器的第二绕组的另一端，另一端则具有一第二电压(V2)输出；a second switch, one end of which is coupled to one end of the second winding of the second transformer and the other end of the second winding of the first transformer, and the other end has a second voltage (V2) output;

一第三开关，其一端耦接至该第二变压器的第二绕组及第三绕组之间，另一端则具有一第三电压(V3)输出；a third switch, one end of which is coupled between the second winding and the third winding of the second transformer, and the other end has a third voltage (V3) output;

一第四开关，其一端耦接至该第二变压器的第四绕组及第五绕组之间，另一端则耦接至该第三开关的另一端；a fourth switch, one end of which is coupled between the fourth winding and the fifth winding of the second transformer, and the other end is coupled to the other end of the third switch;

一第五开关，其一端耦接至该第二变压器的第五绕组的另一端及该第一变压器的第四绕组及第五绕组之间，另一端则耦接至该第二开关的另一端；以及A fifth switch, one end of which is coupled to the other end of the fifth winding of the second transformer and between the fourth and fifth windings of the first transformer, and the other end is coupled to the other end of the second switch ;as well as

一第六开关，其一端耦接至该第二变压器的第六绕组的另一端，另一端则耦接至该第一开关的另一端；a sixth switch, one end of which is coupled to the other end of the sixth winding of the second transformer, and the other end is coupled to the other end of the first switch;

该第一电压输出及该第三电压输出可随着该第二电压输出而升压或降压。The first voltage output and the third voltage output can be stepped up or down with the second voltage output.

其中该第一开关、第二开关、第三开关、第四开关、第五开关及第六开关为一整流器或电力开关，且该电力开关可为N通道金属氧化半场效应晶体管N通道接面场效应晶体管、P通道金属氧化半场效应晶体管或P通道接面场效应晶体管。Wherein the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch are a rectifier or a power switch, and the power switch can be an N-channel MOSFET N-channel junction Field Effect Transistor, P-Channel Metal Oxide Half Field Effect Transistor or P-Channel Junction Field Effect Transistor.

其中该第一变压器的第一绕组具有N1圈数，第二绕组及第五绕组具有N2圈数，第三绕组及第四绕组具有N3圈数，该第二变压器的第一绕组及第六绕组具有N4圈数，第二绕组及第五绕组具有N5圈数，第三绕组及第四绕组具有N6圈数。Wherein the first winding of the first transformer has N1 turns, the second winding and the fifth winding have N2 turns, the third winding and the fourth winding have N3 turns, the first winding of the second transformer and the sixth winding It has N4 turns, the second winding and the fifth winding have N5 turns, and the third winding and the fourth winding have N6 turns.

其中该第一电压where the first voltage

$V V 11 = = ((\frac{N N 44}{N N 55 + + N N 66} + + \frac{N N 22 + + N N 33}{N N 33})) \times \times V V 22,,$

该第三电压The third voltage

$V V 33 = = \frac{N N 66}{N N 55 + + N N 66} \times \times V V 22 . .$

本实用新型的有益效果是：The beneficial effects of the utility model are:

本实用新型的自耦变压器降压电路，其使用一自耦变压器执行降压，以达到多组输出的目的。The autotransformer step-down circuit of the utility model uses an autotransformer to perform step-down, so as to achieve the purpose of multi-group output.

本实用新型的自耦变压器降压电路，其使用一自耦变压器执行升压及降压，以达到多组电压输出的目的。The autotransformer step-down circuit of the utility model uses an autotransformer to perform step-up and step-down, so as to achieve the purpose of outputting multiple sets of voltages.

附图说明 Description of drawings

本实用新型的“自耦变压器升降压电路”、特征及目的以附图及实例详细说明如后，其中：The "autotransformer step-up and step-down circuit" of the present utility model, features and purposes are described in detail with accompanying drawings and examples, wherein:

图1为一示意图，其绘示本案一较佳实施例的自耦变压器降压电路的方块示意图。FIG. 1 is a schematic diagram showing a block diagram of an autotransformer step-down circuit according to a preferred embodiment of the present invention.

图2为一示意图，其绘示本案另一较佳实施例的自耦变压器升降压电路的方块示意图。FIG. 2 is a schematic diagram showing a block diagram of an autotransformer step-down circuit according to another preferred embodiment of the present invention.

具体实施方式 Detailed ways

请参照图1，其绘示本案一较佳实施例的自耦变压器降压电路的方块示意图。如图所示，本实用新型的自耦变压器降压电路，是用于LLC谐振转换器中，其包括：一第一变压器10；一第一开关20；一第二开关30；一第二变压器40；一第三开关50；一第四开关60；一第五开关70；以及一第六开关80所组合而成。Please refer to FIG. 1 , which shows a schematic block diagram of an autotransformer step-down circuit according to a preferred embodiment of the present invention. As shown in the figure, the autotransformer step-down circuit of the present invention is used in the LLC resonant converter, which includes: a first transformer 10; a first switch 20; a second switch 30; a second transformer 40; a third switch 50; a fourth switch 60; a fifth switch 70; and a sixth switch 80 are combined.

其中，该变压器10具有一一次侧及一二次侧，该一次侧具有一第一绕组11，该二次侧具有一第二绕组12及一第三绕组13，且该第二绕组12及第三绕组13互相串接，该第二绕组12及第三绕组13之间则接至地电位(GND)，该第一绕组11的一端耦接至该LLC谐振转换器90的输出端；其中，该LLC谐振转换器90是一般电源供应器所已知的，故在此不拟赘述。该变压器10则例如但不限于为一返驰变压器，其亦为一般电源供应器所已知的，故在此不拟赘述。此外，该第一变压器10的第一绕组11例如但不限于为具有N1圈数，该第二绕组12及第三绕组13则例如但不限于具有N2圈数。Wherein, the transformer 10 has a primary side and a secondary side, the primary side has a first winding 11, the secondary side has a second winding 12 and a third winding 13, and the second winding 12 and The third winding 13 is connected in series, the second winding 12 and the third winding 13 are connected to the ground potential (GND), and one end of the first winding 11 is coupled to the output end of the LLC resonant converter 90; wherein , the LLC resonant converter 90 is known in common power supplies, so details are not described here. The transformer 10 is, for example but not limited to, a flyback transformer, which is also known in general power supplies, so it will not be described in detail here. In addition, the first winding 11 of the first transformer 10 has, for example but not limited to, N1 turns, and the second winding 12 and the third winding 13 have, for example but not limited to, N2 turns.

该第一开关20的一端耦接至该第二绕组12，该第二绕组12的另一端与该第一开关20的另一端间则具有一第一电压(V1)输出，其中，该第一开关20例如但不限于为一整流器或电力开关，其可达到同步整流的目的，且该电力开关可为N通道金属氧化半场效应晶体管N通道接面场效应晶体管、P通道金属氧化半场效应晶体管或P通道接面场效应晶体管，在本实施例中是以整流器为例加以说明，其可节省成本，但并不以此为限。One end of the first switch 20 is coupled to the second winding 12, and there is a first voltage (V1) output between the other end of the second winding 12 and the other end of the first switch 20, wherein the first The switch 20 is, for example but not limited to, a rectifier or a power switch, which can achieve the purpose of synchronous rectification, and the power switch can be an N-channel Metal Oxide Half Field Effect Transistor, an N-channel Junction Field Effect Transistor, a P-channel Metal Oxide Half Field Effect Transistor. The transistor or the P-channel junction field effect transistor is described by taking a rectifier as an example in this embodiment, which can save costs, but is not limited thereto.

该第二开关30的一端耦接至该第三绕组13的另一端，另一端则耦接至该第一开关20的另一端；其中，该第二开关30例如但不限于为一整流器或电力开关，其可达到同步整流的目的，且该电力开关可为N通道金属氧化半场效应晶体管N通道接面场效应晶体管、P通道金属氧化半场效应晶体管或P通道接面场效应晶体管，在本实施例中是以整流器为例加以说明，其可节省成本，但并不以此为限。One end of the second switch 30 is coupled to the other end of the third winding 13, and the other end is coupled to the other end of the first switch 20; wherein, the second switch 30 is, for example but not limited to, a rectifier or power A switch, which can achieve the purpose of synchronous rectification, and the power switch can be an N-channel metal oxide half field effect transistor, an N-channel junction field effect transistor, a P-channel metal oxide half field effect transistor, or a P-channel junction field effect transistor. In this embodiment, a rectifier is taken as an example for illustration, which can save costs, but it is not limited thereto.

该第二变压器40具有一第一绕组41、第二绕组42、第三绕组43、第四绕组44、第五绕组45及第六绕组46，其中该第一绕组41的一端耦接至该第一变压器10的第二绕组12，该第六绕组46的另一端耦接至该第一变压器10的第三绕组13的另一端，该第三绕组43及第四绕组44之间则接至地电位。该第二变压器40例如但不限于为一自耦变压器，且该第二变压器40的第一绕组41及第六绕组46例如但不限于具有N5圈数，该第二绕组42及第五绕组45例如但不限于具有N4圈数，该第三绕组43及第四绕组44例如但不限于具有N3圈数。The second transformer 40 has a first winding 41, a second winding 42, a third winding 43, a fourth winding 44, a fifth winding 45 and a sixth winding 46, wherein one end of the first winding 41 is coupled to the first The second winding 12 of a transformer 10, the other end of the sixth winding 46 is coupled to the other end of the third winding 13 of the first transformer 10, and the third winding 43 and the fourth winding 44 are connected to the ground potential. The second transformer 40 is, for example but not limited to, an autotransformer, and the first winding 41 and the sixth winding 46 of the second transformer 40 have, for example but not limited to, N5 turns, the second winding 42 and the fifth winding 45 For example but not limited to N4 turns, the third winding 43 and the fourth winding 44 have N3 turns for example but not limited to.

该第三开关50的一端耦接至该第二变压器40的第一绕组41及第二绕组42之间，另一端则具有一第二电压(V2)输出；其中，该第三开关50例如但不限于为一整流器或电力开关，其可达到同步整流的目的，且该电力开关可为N通道金属氧化半场效应晶体管N通道接面场效应晶体管、P通道金属氧化半场效应晶体管或P通道接面场效应晶体管，在本实施例中是以整流器为例加以说明，其可节省成本，但并不以此为限。One end of the third switch 50 is coupled between the first winding 41 and the second winding 42 of the second transformer 40, and the other end has a second voltage (V2) output; wherein, the third switch 50 is, for example, but It is not limited to a rectifier or a power switch, which can achieve the purpose of synchronous rectification, and the power switch can be an N-channel metal oxide half field effect transistor N-channel junction field effect transistor, a P-channel metal oxide half field effect transistor or a P-channel In this embodiment, a rectifier is used as an example to illustrate the junction field effect transistor, which can save costs, but is not limited thereto.

该第四开关60的一端耦接至该第二变压器40的第二绕组42及第三绕组43之间；其中，该第四开关60例如但不限于为一整流器或电力开关，其可达到同步整流的目的，且该电力开关可为N通道金属氧化半场效应晶体管N通道接面场效应晶体管、P通道金属氧化半场效应晶体管或P通道接面场效应晶体管，在本实施例中是以整流器为例加以说明，其可节省成本，但并不以此为限。One end of the fourth switch 60 is coupled between the second winding 42 and the third winding 43 of the second transformer 40; wherein, the fourth switch 60 is, for example but not limited to, a rectifier or a power switch, which can achieve synchronization The purpose of rectification, and the power switch can be an N-channel Metal Oxide Half Field Effect Transistor, an N-channel Junction Field Effect Transistor, a P-channel Metal Oxide Half Field Effect Transistor, or a P-channel Junction Field Effect Transistor. In this embodiment, it is A rectifier is used as an example, which can save costs, but is not limited thereto.

该第五开关70的一端耦接至该第二变压器40的第四绕组44及第五绕组45之间，另一端则耦接至该第四开关60的另一端且具有一第三电压(V3)输出；其中，该第五开关70例如但不限于为一整流器或电力开关，其可达到同步整流的目的，且该电力开关可为N通道金属氧化半场效应晶体管N通道接面场效应晶体管、P通道金属氧化半场效应晶体管或P通道接面场效应晶体管，在本实施例中是以整流器为例加以说明，其可节省成本，但并不以此为限。One end of the fifth switch 70 is coupled between the fourth winding 44 and the fifth winding 45 of the second transformer 40, and the other end is coupled to the other end of the fourth switch 60 and has a third voltage (V3 ) output; wherein, the fifth switch 70 is, for example but not limited to, a rectifier or a power switch, which can achieve the purpose of synchronous rectification, and the power switch can be an N-channel metal oxide semiconductor field effect transistor N-channel junction field effect transistor . The P-channel Metal Oxide Half Field Effect Transistor or the P-channel Junction Field Effect Transistor is described by taking a rectifier as an example in this embodiment, which can save costs, but is not limited thereto.

该第六开关80的一端耦接至该第二变压器40的第五绕组45及第六绕组46之间，另一端则耦接至该第三开关50的另一端；其中，该第六开关80例如但不限于为一整流器或电力开关，其可达到同步整流的目的，且该电力开关可为N通道金属氧化半场效应晶体管N通道接面场效应晶体管、P通道金属氧化半场效应晶体管或P通道接面场效应晶体管，在本实施例中是以整流器为例加以说明，其可节省成本，但并不以此为限。One end of the sixth switch 80 is coupled between the fifth winding 45 and the sixth winding 46 of the second transformer 40, and the other end is coupled to the other end of the third switch 50; wherein, the sixth switch 80 For example but not limited to a rectifier or a power switch, which can achieve the purpose of synchronous rectification, and the power switch can be an N-channel metal oxide half field effect transistor N-channel junction field effect transistor, a P-channel metal oxide half field effect transistor or The P-channel junction field effect transistor is described by taking a rectifier as an example in this embodiment, which can save costs, but is not limited thereto.

其中，该第二电压(V2)经由各线圈的线圈比分压后可由下列公式得知： $V 2 = \frac{N 3 + N 4}{N 3 + N 4 + N 5} \times V 1,$ 因此，由精确控制该第二变压器40的该第三绕组43及第四绕组44的圈数N3，该第二绕组42及第五绕组45的圈数N4及第一绕组41及第六绕组46的圈数N5即可得到稳定的第二电压(V2)输出，而不会有上述交互调整(cross regulation)的作用产生。Wherein, the second voltage (V2) can be obtained by the following formula after the coil ratio of each coil is reduced: $V 2 = \frac{N 3 + N 4}{N 3 + N 4 + N 5} \times V 1,$ Therefore, by precisely controlling the number of turns N3 of the third winding 43 and the fourth winding 44 of the second transformer 40, the number of turns N4 of the second winding 42 and the fifth winding 45 and the number of turns N4 of the first winding 41 and the sixth winding 46 The stable output of the second voltage (V2) can be obtained by the number of turns N5, without the effect of the above-mentioned cross regulation.

该第三电压(V3)经由各线圈的线圈比分压后可由下列公式得知： $V 3 = \frac{N 3}{N 3 + N 4 + N 5} \times V 1,$ 因此，由精确控制该第二变压器40的该第三绕组43及第四绕组44的圈数N3，该第二绕组42及第五绕组45的圈数N4及第一绕组41及第六绕组46的圈数N5即可得到稳定的第三电压(V3)输出，而不会有上述交互调整(cross regulation)的作用产生。因此，本实用新型的自耦变压器降压电路确较已知技术的LLC谐振转换器具进步性。The third voltage (V3) can be obtained by the following formula after passing through the coil ratio of each coil: $V 3 = \frac{N 3}{N 3 + N 4 + N 5} \times V 1,$ Therefore, by precisely controlling the number of turns N3 of the third winding 43 and the fourth winding 44 of the second transformer 40, the number of turns N4 of the second winding 42 and the fifth winding 45 and the number of turns N4 of the first winding 41 and the sixth winding 46 The stable output of the third voltage (V3) can be obtained by the number of turns N5, without the effect of the above-mentioned cross regulation. Therefore, the autotransformer step-down circuit of the present invention is indeed more advanced than the LLC resonant converter of the known technology.

请参照图2，其绘示本案另一较佳实施例的自耦变压器升降压电路的方块示意图。如图所示，本实用新型的自耦变压器升降压电路，是用于LLC谐振转换器中，其包括：一第一变压器110；一第二变压器120；一第一开关130；一第二开关140；一第三开关150；一第四开关160；一第五开关170；以及一第六开关180所组合而成。Please refer to FIG. 2 , which shows a schematic block diagram of an autotransformer buck-boost circuit in another preferred embodiment of the present application. As shown in the figure, the autotransformer step-down circuit of the present invention is used in the LLC resonant converter, which includes: a first transformer 110; a second transformer 120; a first switch 130; a second A switch 140 ; a third switch 150 ; a fourth switch 160 ; a fifth switch 170 ; and a sixth switch 180 are combined.

其中，该变压器110具有一一次侧及一二次侧，该一次侧具有一第一绕组111，该二次侧具有一第二绕组112、一第三绕组113、一第四绕组114及一第五绕组115，且该第二绕组112、第三绕组113、第四绕组114及第五绕组115互相串接，该第一绕组111的一端耦接至一LLC谐振转换器190的输出端；其中，该LLC谐振转换器190是一般电源供应器所已知的，故在此不拟赘述。该变压器110则例如但不限于为一返驰变压器，其亦为一般电源供应器所已知的，故在此不拟赘述。此外，该第一变压器110的第一绕组111例如但不限于为具有N1圈数，该第二绕组112及第五绕组115则例如但不限于具有N2圈数，该第三绕组113及第四绕组114则例如但不限于具有N3圈数。Wherein, the transformer 110 has a primary side and a secondary side, the primary side has a first winding 111, the secondary side has a second winding 112, a third winding 113, a fourth winding 114 and a The fifth winding 115, and the second winding 112, the third winding 113, the fourth winding 114 and the fifth winding 115 are connected in series, and one end of the first winding 111 is coupled to the output end of an LLC resonant converter 190; Wherein, the LLC resonant converter 190 is known in common power supplies, so it is not necessary to repeat it here. The transformer 110 is, for example but not limited to, a flyback transformer, which is also known in general power supplies, so it will not be described in detail here. In addition, the first winding 111 of the first transformer 110 has, for example but not limited to, N1 turns, the second winding 112 and the fifth winding 115 have, for example but not limited to, N2 turns, the third winding 113 and the fourth The winding 114 has, for example but not limited to, N3 turns.

该第二变压器120具有一第一绕组121、第二绕组122、第三绕组123、第四绕组124、第五绕组125及第六绕组126，其中该第一绕组121的一端耦接至该第一变压器110的第二绕组112，该第六绕组126的一端耦接至该第一变压器110的第五绕组115的另一端，该第三绕组113及第四绕组114之间则接至地电位。该第二变压器120例如但不限于为一自耦变压器，且该第二变压器120的第一绕组121及第六绕组126例如但不限于具有N4圈数，该第二绕组122及第五绕组125例如但不限于具有N5圈数，该第三绕组123及第四绕组124例如但不限于具有N6圈数。The second transformer 120 has a first winding 121, a second winding 122, a third winding 123, a fourth winding 124, a fifth winding 125 and a sixth winding 126, wherein one end of the first winding 121 is coupled to the first winding 121 The second winding 112 of a transformer 110, one end of the sixth winding 126 is coupled to the other end of the fifth winding 115 of the first transformer 110, and the third winding 113 and the fourth winding 114 are connected to ground potential . The second transformer 120 is, for example but not limited to, an autotransformer, and the first winding 121 and the sixth winding 126 of the second transformer 120 have, for example but not limited to, N4 turns, the second winding 122 and the fifth winding 125 For example but not limited to N5 turns, the third winding 123 and the fourth winding 124 have N6 turns for example but not limited to.

该第一开关130的一端耦接至该第二变压器120的第二绕组122的另一端，另一端则具有一第一电压(V1)输出，其中，该第一开关130例如但不限于为一整流器或电力开关，其可达到同步整流的目的，且该电力开关可为N通道金属氧化半场效应晶体管N通道接面场效应晶体管、P通道金属氧化半场效应晶体管或P通道接面场效应晶体管，在本实施例中是以整流器为例加以说明，其可节省成本，但并不以此为限。One end of the first switch 130 is coupled to the other end of the second winding 122 of the second transformer 120, and the other end has a first voltage (V1) output, wherein the first switch 130 is, for example but not limited to, a A rectifier or a power switch, which can achieve the purpose of synchronous rectification, and the power switch can be an N-channel metal oxide half field effect transistor N-channel junction field effect transistor, a P-channel metal oxide half field effect transistor or a P-channel junction field effect transistor In this embodiment, a rectifier is used as an example to illustrate the transistor, which can save costs, but is not limited thereto.

该第二开关140的一端耦接至该第二变压器120的第二绕组122的一端及该第一变压器110的第二绕组112的另一端，另一端则具有一第二电压(V2)输出；其中，该第二开关140例如但不限于为一整流器或电力开关，其可达到同步整流的目的，且该电力开关可为N通道金属氧化半场效应晶体管N通道接面场效应晶体管、P通道金属氧化半场效应晶体管或P通道接面场效应晶体管，在本实施例中是以整流器为例加以说明，其可节省成本，但并不以此为限。One end of the second switch 140 is coupled to one end of the second winding 122 of the second transformer 120 and the other end of the second winding 112 of the first transformer 110, and the other end has a second voltage (V2) output; Wherein, the second switch 140 is, for example but not limited to, a rectifier or a power switch, which can achieve the purpose of synchronous rectification, and the power switch can be an N-channel MOSFET, an N-channel junction field effect transistor, a P-channel The Metal Oxide Half Field Effect Transistor or the P-channel Junction Field Effect Transistor is described by taking a rectifier as an example in this embodiment, which can save costs, but is not limited thereto.

该第三开关150的一端耦接至该第二变压器120的第二绕组122及第三绕组123之间，另一端则具有一第三电压(V3)输出；其中，该第三开关150例如但不限于为一整流器或电力开关，其可达到同步整流的目的，且该电力开关可为N通道金属氧化半场效应晶体管N通道接面场效应晶体管、P通道金属氧化半场效应晶体管或P通道接面场效应晶体管，在本实施例中是以整流器为例加以说明，其可节省成本，但并不以此为限。One end of the third switch 150 is coupled between the second winding 122 and the third winding 123 of the second transformer 120, and the other end has a third voltage (V3) output; wherein, the third switch 150 is for example but It is not limited to a rectifier or a power switch, which can achieve the purpose of synchronous rectification, and the power switch can be an N-channel metal oxide half field effect transistor N-channel junction field effect transistor, a P-channel metal oxide half field effect transistor or a P-channel In this embodiment, a rectifier is used as an example to illustrate the junction field effect transistor, which can save costs, but is not limited thereto.

该第四开关160的一端耦接至该第二变压器120的第四绕组124及第五绕组125之间，另一端则耦接至该第三开关150的另一端；其中，该第四开关160例如但不限于为一整流器或电力开关，其可达到同步整流的目的，且该电力开关可为N通道金属氧化半场效应晶体管N通道接面场效应晶体管、P通道金属氧化半场效应晶体管或P通道接面场效应晶体管，在本实施例中是以整流器为例加以说明，其可节省成本，但并不以此为限。One end of the fourth switch 160 is coupled between the fourth winding 124 and the fifth winding 125 of the second transformer 120, and the other end is coupled to the other end of the third switch 150; wherein, the fourth switch 160 For example but not limited to a rectifier or a power switch, which can achieve the purpose of synchronous rectification, and the power switch can be an N-channel metal oxide half field effect transistor N-channel junction field effect transistor, a P-channel metal oxide half field effect transistor or The P-channel junction field effect transistor is described by taking a rectifier as an example in this embodiment, which can save costs, but is not limited thereto.

该第五开关70的一端耦接至该第二变压器120的第五绕组125的另一端及该第一变压器110的第四绕组114及第五绕组115之间，另一端则耦接至该第二开关140的另一端；其中，该第五开关170例如但不限于为一整流器或电力开关，其可达到同步整流的目的，且该电力开关可为N通道金属氧化半场效应晶体管N通道接面场效应晶体管、P通道金属氧化半场效应晶体管或P通道接面场效应晶体管，在本实施例中是以整流器为例加以说明，其可节省成本，但并不以此为限。One end of the fifth switch 70 is coupled to the other end of the fifth winding 125 of the second transformer 120 and between the fourth winding 114 and the fifth winding 115 of the first transformer 110, and the other end is coupled to the fifth winding 115. The other end of the second switch 140; wherein, the fifth switch 170 is, for example but not limited to, a rectifier or a power switch, which can achieve the purpose of synchronous rectification, and the power switch can be an N-channel Metal Oxide Half Field Effect Transistor N-channel connected In this embodiment, a rectifier is used as an example to describe the surface field effect transistor, P-channel Metal Oxide Half Field Effect Transistor or P-channel Junction Field Effect Transistor, which can save costs, but is not limited thereto.

该第六开关80的一端耦接至该第二变压器120的第六绕组126的另一端，另一端则耦接至该第一开关130的另一端；其中，该第六开关180例如但不限于为一整流器或电力开关，其可达到同步整流的目的，且该电力开关可为N通道金属氧化半场效应晶体管N通道接面场效应晶体管、P通道金属氧化半场效应晶体管或P通道接面场效应晶体管，在本实施例中是以整流器为例加以说明，其可节省成本，但并不以此为限。One end of the sixth switch 80 is coupled to the other end of the sixth winding 126 of the second transformer 120, and the other end is coupled to the other end of the first switch 130; wherein, the sixth switch 180 is for example but not limited to It is a rectifier or a power switch, which can achieve the purpose of synchronous rectification, and the power switch can be an N-channel metal oxide half-field-effect transistor N-channel junction field-effect transistor, a P-channel metal oxide half-field-effect transistor or a P-channel junction In this embodiment, a rectifier is used as an example to illustrate the field effect transistor, which can save costs, but is not limited thereto.

其中，该第一电压(V1)经由各线圈的线圈比分压后可由下列公式得知： $V 1 = (\frac{N 4}{N 5 + N 6} + \frac{N 2 + N 3}{N 3}) \times V 2,$ 因此，由精确控制该第一变压器110的第二绕组112及第五绕组115的圈数N2、第三绕组113及第四绕组114的圈数N3、该第二变压器120的第一绕组121及第六绕组126的圈数N4，该第二绕组122及第五绕组125的圈数N5及第三绕组123及第四绕组124的圈数N6即可得到稳定的第一电压(V1)输出，而不会有上述交互调整(crossregulation)的作用产生。Wherein, the first voltage (V1) can be obtained by the following formula after the coil ratio of each coil is reduced: $V 1 = (\frac{N 4}{N 5 + N 6} + \frac{N 2 + N 3}{N 3}) \times V 2,$ Therefore, by precisely controlling the number of turns N2 of the second winding 112 and the fifth winding 115 of the first transformer 110, the number of turns N3 of the third winding 113 and the fourth winding 114, the first winding 121 and the number of turns of the second transformer 120 The number of turns N4 of the sixth winding 126, the number of turns N5 of the second winding 122 and the fifth winding 125, and the number of turns N6 of the third winding 123 and the fourth winding 124 can obtain a stable first voltage (V1) output, There will be no effect of the above-mentioned crossregulation.

该第三电压(V3)经由各线圈的线圈比分压后可由下列公式得知： $V 3 = \frac{N 6}{N 5 + N 6} \times V 2,$ 因此，由精确控制该第二变压器120的第二绕组122及第五绕组125的圈数N5及第三绕组123及第四绕组124的圈数N6即可得到稳定的第三电压(V3)输出，而不会有上述交互调整(cross regulation)的作用产生。The third voltage (V3) can be obtained by the following formula after passing through the coil ratio of each coil: $V 3 = \frac{N 6}{N 5 + N 6} \times V 2,$ Therefore, a stable third voltage (V3) output can be obtained by precisely controlling the number of turns N5 of the second winding 122 and the fifth winding 125 and the number of turns N6 of the third winding 123 and the fourth winding 124 of the second transformer 120. , without the effect of the above-mentioned cross regulation.

是以，经由本实用新型的自耦变压器升降压电路的实施，其可藉由使用一自耦变压器执行升压及降压，以达到多组电压输出，且各组电压输出之间不会有交互调整的作用产生等优点，因此，确可改善已知电源供应器中LLC谐振转换器的缺点。Therefore, through the implementation of the autotransformer buck-boost circuit of the present invention, it can achieve multiple sets of voltage outputs by using an autotransformer to perform step-up and step-down, and there will be no gap between each set of voltage outputs. There are advantages such as the effect of mutual adjustment, and therefore, the shortcomings of the LLC resonant converter in the known power supply can indeed be improved.

本案所揭示的，乃较佳实施例，凡是局部的变更或修饰而源于本案的技术思想而为熟习该项技术的人所易于推知的，俱不脱本案的权利要求范畴。What is disclosed in this case is a preferred embodiment, and any partial changes or modifications derived from the technical idea of this case and easily deduced by those familiar with the technology do not depart from the scope of the claims of this case.

Claims

1. an autotransformer step-down circuit, is used in the LLC resonant converter, is characterized in that, it has:

A first transformer having a primary side and a secondary side, the primary side has a first winding, the secondary side has a second winding and a third winding, and the second winding and the third winding connected in series, the second winding and the third winding are connected to ground potential, and one end of the first winding is coupled to the output end of the LLC resonant converter;

A first switch, one end of which is coupled to the second winding, and a first voltage (V1) output between the other end of the second winding and the other end of the first switch;

a second switch, one end of which is coupled to the other end of the third winding, and the other end is coupled to the other end of the first switch;

a second transformer having a first winding, a second winding, a third winding, a fourth winding, a fifth winding and a sixth winding, one end of the first winding is coupled to the second winding of the first transformer, The other end of the sixth winding is coupled to the other end of the third winding of the first transformer, and the third winding and the fourth winding are connected to ground potential;

a third switch, one end of which is coupled between the first winding and the second winding of the second transformer, and the other end has a second voltage (V2) output;

a fourth switch, one end of which is coupled between the second winding and the third winding of the second transformer;

a fifth switch, one end of which is coupled between the fourth winding and the fifth winding of the second transformer, and the other end is coupled to the other end of the fourth switch and has a third voltage (V3) output; and

a sixth switch, one end of which is coupled between the fifth winding and the sixth winding of the second transformer, and the other end is coupled to the other end of the third switch;

The second voltage output and the third voltage output will not change as the load of the first voltage output changes.

2. The autotransformer step-down circuit as claimed in claim 1, wherein the second transformer is an autotransformer.

3. The autotransformer step-down circuit according to claim 1, wherein the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch are a rectifier or a power A switch, and the power switch is an N-channel Metal Oxide Half Field Effect Transistor, an N-channel Junction Field Effect Transistor, a P-channel Metal Oxide Half Field Effect Transistor, or a P-channel Junction Field Effect Transistor.

4. The autotransformer step-down circuit as claimed in claim 1, wherein the first winding of the first transformer has N1 turns, the second winding and the third winding have N2 turns, and the second transformer The first winding and the sixth winding have N5 turns, the second winding and the fifth winding have N4 turns, and the third winding and the fourth winding have N3 turns.

5. The autotransformer step-down circuit according to claim 4, wherein the second voltage

V V 22 = = \frac{N N 33 + + N N 44}{N N 33 + + N N 44 + + N N 55} \times \times V V 11,,

The third voltage

V V 33 = = \frac{N N 33}{N N 33 + + N N 44 + + N N 55} \times \times V V 11 . .

6. An autotransformer buck-boost circuit, which is used in an LLC resonant converter, is characterized in that it has:

A first transformer having a primary side and a secondary side, the primary side has a first winding, the secondary side has a second winding, a third winding, a fourth winding and a fifth winding , and the second winding, the third winding, the fourth winding and the fifth winding are connected in series, and one end of the first winding is coupled to the output end of the LLC resonant converter;

a second transformer having a first winding, a second winding, a third winding, a fourth winding, a fifth winding and a sixth winding, one end of the first winding is coupled to the second winding of the first transformer, One end of the sixth winding is coupled to the other end of the fifth winding of the first transformer, and the third winding and the fourth winding are connected to ground potential;

a first switch, one end of which is coupled to the other end of the second winding of the second transformer, and the other end has a first voltage (V1) output;

a second switch, one end of which is coupled to one end of the second winding of the second transformer and the other end of the second winding of the first transformer, and the other end has a second voltage (V2) output;

a third switch, one end of which is coupled between the second winding and the third winding of the second transformer, and the other end has a third voltage (V3) output;

a fourth switch, one end of which is coupled between the fourth winding and the fifth winding of the second transformer, and the other end is coupled to the other end of the third switch;

A fifth switch, one end of which is coupled to the other end of the fifth winding of the second transformer and between the fourth and fifth windings of the first transformer, and the other end is coupled to the other end of the second switch ;as well as

a sixth switch, one end of which is coupled to the other end of the sixth winding of the second transformer, and the other end is coupled to the other end of the first switch;

The first voltage output and the third voltage output can be stepped up or down with the second voltage output.

7. The autotransformer buck-boost circuit as claimed in claim 6, wherein the second transformer is an autotransformer.

8. The autotransformer buck-boost circuit according to claim 6, wherein the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch are a rectifier or A power switch, and the power switch can be an N-channel metal oxide semiconductor field effect transistor, an N-channel junction field effect transistor, a P-channel metal oxide half field effect transistor, or a P-channel junction field effect transistor.

9. The autotransformer step-down circuit according to claim 6, wherein the first winding of the first transformer has N1 turns, the second winding and the fifth winding have N2 turns, and the third winding and the fourth winding has N3 turns, the first and sixth windings of the second transformer have N4 turns, the second and fifth windings have N5 turns, and the third and fourth windings have N6 turns.

10. The autotransformer buck-boost circuit according to claim 9, wherein the first voltage

V V 11 = = ((\frac{N N 44}{N N 55 + + N N 66} + + \frac{N N 22 + + N N 33}{N N 33})) \times \times V V 22,,

The third voltage

V V 33 = = \frac{N N 66}{N N 55 + + N N 66} \times \times V V 22 . .