CN101145738A - Power adapter and power supply system using same - Google Patents

The invention relates to a power supply adapter capable of simultaneously providing low-level direct current voltage and high-level direct current voltage. The voltage commutator comprises a transformer having a primary side winding for storing energy when a main switch connected thereto is turned on and transferring the stored energy to a secondary side of the transformer when the main switch is turned off. The transformer includes a first secondary side winding and a second secondary side winding connected in series with each other. The first rectifying and filtering circuit is connected to the first secondary side winding and used for rectifying and filtering the energy received by the first secondary side winding to generate a low-level direct-current voltage. The second rectifying and filtering circuit is connected across the first secondary side winding and the second secondary side winding and is used for rectifying and filtering the energy received by the first secondary side winding and the second secondary side winding to generate high-level direct-current voltage. The invention can greatly reduce the power loss of the DC-AC converter and greatly improve the conversion efficiency of the DC-AC converter.

电源转接器以及使用该电源转接器的电源供应系统 Power adapter and power supply system using the power adapter

技术领域 technical field

本发明涉及一种电源转接器，更具体的是本发明涉及一种能够同时输出低电平直流电压与高电平直流电压给不同规格的电源转换器来进行电源转换的电源转接器。The present invention relates to a power adapter, and more specifically, the present invention relates to a power adapter capable of simultaneously outputting low-level DC voltage and high-level DC voltage to power converters of different specifications for power conversion.

背景技术 Background technique

图1为一种现有技术的使用于平板显示器(flat panel display)的电源供应系统的系统方块图。如图1所示，电源转接器(power adapter)100设定为接收输入交流电压Vin并将输入交流电压Vin转换成输出直流电压Vo，并且输出直流电压Vo分别提供给直流-交流转换器101(或称为逆变器(inverter))以及直流-直流转换器102。直流-直流转换器102设定为将输出直流电压Vo转换成具有较低电压电平的直流电压，以便电源驱动平板显示器内部的控制电路(未显示)。直流-交流转换器101设定为将输出直流电压Vo转换成高频的高电平交流电压，以便点亮作为平板显示器的背光光源的放电灯管(未显示)。FIG. 1 is a system block diagram of a prior art power supply system for a flat panel display. As shown in FIG. 1 , the power adapter (power adapter) 100 is configured to receive an input AC voltage Vin and convert the input AC voltage Vin into an output DC voltage Vo, and the output DC voltage Vo is provided to a DC-AC converter 101 respectively. (or called an inverter) and a DC-DC converter 102 . The DC-DC converter 102 is configured to convert the output DC voltage Vo into a DC voltage with a lower voltage level for powering a control circuit (not shown) inside the flat panel display. The DC-AC converter 101 is configured to convert the output DC voltage Vo into a high frequency high-level AC voltage for lighting a discharge lamp (not shown) as a backlight source of a flat panel display.

典型的使用于平板显示器的电源转接器是接收110V或220V的输入交流电压，而提供12V的输出直流电压。因此，图1所示的电源转接器100所提供的输出直流电压Vo一般而言是一个低电平(low-level)的直流电压，其电压值约为12V，而直流-直流转换器102的输出直流电压的电压值一般而言可为1.5V、2.5V、3V、3.3V、4.5V、5V、6V、7.5V、9V、12V。然而，直流-交流转换器101一般而言需要输出高频交流电压来符合用来点亮平板显示器内部的放电灯管所需的电源。因此，直流-交流转换器101必须要将电源转接器100所提供的电压值约为12V的输出直流电压Vo转换成高频交流电压。A typical power adapter for a flat panel display receives an input AC voltage of 110V or 220V and provides an output DC voltage of 12V. Therefore, the output DC voltage Vo provided by the power adapter 100 shown in FIG. 1 is generally a low-level DC voltage with a voltage value of about 12V. The voltage value of the output DC voltage generally can be 1.5V, 2.5V, 3V, 3.3V, 4.5V, 5V, 6V, 7.5V, 9V, 12V. However, generally speaking, the DC-AC converter 101 needs to output a high-frequency AC voltage to meet the power required for lighting the discharge lamp inside the flat panel display. Therefore, the DC-AC converter 101 must convert the output DC voltage Vo of about 12V provided by the power adapter 100 into a high-frequency AC voltage.

直流-交流转换器101设定为经由内部的晶体管开关(未显示)的开关切换以及高压变压器(未显示)的电压升压操作将低电平的直流电压转换成高电平的交流电压。在这种情形下，直流-交流转换器101的电压转换比例(voltagetransformation ratio)会变得相当大。因此直流-交流转换器101会产生相当大的功率损失(power loss)，进而导致直流-交流转换器101的转换效率(conversion efficiency)低落。如果能够让电源转接器100提供具有较高电压电平的输出直流电压给直流-交流转换器101来进行电源转换，则直流-交流转换器101所产生的功率损失便可减少，并且使得直流-交流转换器101的转换效率得以提升。The DC-AC converter 101 is configured to convert a low-level DC voltage into a high-level AC voltage via switching of an internal transistor switch (not shown) and voltage boosting operation of a high-voltage transformer (not shown). In this situation, the voltage transformation ratio of the DC-AC converter 101 becomes quite large. Therefore, the DC-AC converter 101 will generate a considerable power loss, which further reduces the conversion efficiency of the DC-AC converter 101 . If the power adapter 100 can provide an output DC voltage with a higher voltage level to the DC-AC converter 101 for power conversion, the power loss generated by the DC-AC converter 101 can be reduced, and the DC - The conversion efficiency of the AC converter 101 is improved.

图2显示图1的电源转接器100的电路示意图。如图2所示，电源转接器100包含桥式整流器(bridge rectifier)201，其设定为将输入交流电压Vin整流成为全波整流的直流电压，以及变压器T21，其具有初级侧绕组(primarywinding)Np21以及次级侧绕组(secondary winding)Ns21，其中初级侧绕组Np21设定为与初级侧绕组Np21串联的主开关S21导通时，储存自输入交流电压Vin接收的能量，并且于主开关S21截止时，将所储存的能量传送至次级侧绕组Ns21。主开关S21的开关切换由脉冲宽度调制器(pulse-widthmodulator，PWM)202来控制。电源转接器100还包含一整流滤波电路，其由整流二极管D21与滤波电容C21所组成且耦接至次级侧绕组Ns21。整流滤波电路(D21，C21)设定为将次级侧绕组Ns21所接收的能量进行整流与滤波以产生所想要的输出直流电压Vo。电源转接器100还包含反馈控制电路(feedback control circuit)203，其设定为检测输出直流电压Vo的变化，并且根据检测的结果发出反馈信号(feedback signal)至脉冲宽度调制器202，以启动脉冲宽度调制器202来将输出直流电压Vo稳定于一预定值。FIG. 2 shows a schematic circuit diagram of the power adapter 100 in FIG. 1 . As shown in FIG. 2, the power adapter 100 includes a bridge rectifier (bridge rectifier) 201, which is configured to rectify the input AC voltage Vin into a full-wave rectified DC voltage, and a transformer T21, which has a primary winding (primary winding ) Np21 and the secondary winding (secondary winding) Ns21, wherein the primary winding Np21 is set to store the energy received from the input AC voltage Vin when the main switch S21 connected in series with the primary winding Np21 is turned on, and the main switch S21 When turned off, the stored energy is transmitted to the secondary side winding Ns21. Switching of the main switch S21 is controlled by a pulse-width modulator (PWM) 202 . The power adapter 100 further includes a rectification filter circuit, which is composed of a rectification diode D21 and a filter capacitor C21 and is coupled to the secondary winding Ns21. The rectification and filtering circuit ( D21 , C21 ) is set to rectify and filter the energy received by the secondary winding Ns21 to generate a desired output DC voltage Vo. The power adapter 100 also includes a feedback control circuit (feedback control circuit) 203, which is set to detect the change of the output DC voltage Vo, and sends a feedback signal (feedback signal) to the pulse width modulator 202 according to the detection result to start The pulse width modulator 202 is used to stabilize the output DC voltage Vo at a predetermined value.

如前所述，现有技术的电源转接器100的输出直流电压Vo是一个低电平的直流电压。若是这个低电平的输出直流电压Vo提供给图1所示的直流-交流转换器101进行电源转换，会在直流-交流转换器101内部产生相当大的电源损失并且导致直流-交流转换器101的转换效率低落。在此，若是发展一种能够同时输出低电平直流电压与高电平直流电压的电源转接器，则是能够解决上述缺陷的理想方案。本发明可以满足这个需求。As mentioned above, the output DC voltage Vo of the conventional power adapter 100 is a low-level DC voltage. If this low-level output DC voltage Vo is provided to the DC-AC converter 101 shown in FIG. The conversion efficiency is low. Here, if a power adapter capable of simultaneously outputting low-level DC voltage and high-level DC voltage is developed, it is an ideal solution to solve the above-mentioned defects. The present invention fulfills this need.

发明内容 Contents of the invention

本发明的目的在于提供一种电源转接器，其可提供低电平直流电压给直流-直流转换器来进行电源转换，并且提供高电平直流电压给直流-交流转换器来进行电源转换。The object of the present invention is to provide a power adapter, which can provide a low-level DC voltage to a DC-DC converter for power conversion, and provide a high-level DC voltage to a DC-AC converter for power conversion.

根据本发明的较佳实施例，电源转接器包含整流器，用以将输入交流电压整流成为整流的直流电压，以及变压器，具有初级侧绕组，其中该初级侧绕组与主开关串联。该初级侧绕组设定为当主开关导通时储存能量，并且当主开关截止时将储存的能量传送至变压器的次级侧。变压器还包含第一次级侧绕组以及第二次级侧绕组，其中第一次级侧绕组与第二次级侧绕组互相串联。电源转接器还包含第一整流滤波电路，耦接至该第一次级侧绕组，用以将该第一次级侧绕组所接收的能量进行整流与滤波而产生低电平直流电压，以及第二整流滤波电路，跨接于该第一次级侧绕组与该第二次级侧绕组，用以将该第一次级侧绕组与该第二次级侧绕组所接收的能量进行整流与滤波而产生高电平直流电压。According to a preferred embodiment of the present invention, the power adapter includes a rectifier for rectifying an input AC voltage into a rectified DC voltage, and a transformer having a primary winding connected in series with a main switch. The primary side winding is set to store energy when the main switch is on and to transfer the stored energy to the secondary side of the transformer when the main switch is off. The transformer also includes a first secondary winding and a second secondary winding, wherein the first secondary winding and the second secondary winding are connected in series. The power adapter also includes a first rectifying and filtering circuit coupled to the first secondary winding for rectifying and filtering the energy received by the first secondary winding to generate a low-level DC voltage, and The second rectification and filtering circuit is connected across the first secondary winding and the second secondary winding, and is used for rectifying and synchronizing the energy received by the first secondary winding and the second secondary winding. filtering to produce a high-level DC voltage.

根据本发明的构想，本申请提供一种电源供应系统，其包含：电源转接器，用以将输入交流电压同时转换成低电平输出直流电压与高电平输出直流电压；直流-直流转换器，耦接于该电源转接器，用以接收该电源转接器所提供的该低电平输出直流电压，并转换为直流电压输出；以及直流-交流转换器，耦接于该电源转接器，用以接收该电源转接器所提供的该高电平输出直流电压，并转换为交流电压输出。其中，该电源转接器包括：开关；以及变压器，具有初级侧绕组以及第一次级侧绕组与第二次级侧绕组，其中该初级侧绕组与该开关串联并且该第一次级侧绕组与该第二次级侧绕组为互相串联，其设定为在该开关导通时储存能量于该初级侧绕组，并且在该开关截止时将该初级侧绕组所储存的能量传送至该第一次级侧绕组与该第二次级侧绕组；第一整流滤波电路，耦接至该第一次级侧绕组，用以将该第一次级侧绕组所接收的能量进行整流与滤波而产生该低电平输出直流电压；以及第二整流滤波电路，跨接于该第一次级侧绕组与该第二次级侧绕组，用以将该第一次级侧绕组与该第二次级侧绕组所接收的能量进行整流与滤波而产生该高电平输出直流电压。According to the idea of the present invention, the present application provides a power supply system, which includes: a power adapter for simultaneously converting the input AC voltage into a low-level output DC voltage and a high-level output DC voltage; DC-DC conversion A device, coupled to the power adapter, is used to receive the low-level output DC voltage provided by the power adapter and convert it into a DC voltage output; and a DC-AC converter, coupled to the power adapter The adapter is used to receive the high-level output DC voltage provided by the power adapter and convert it into an AC voltage output. Wherein, the power adapter includes: a switch; and a transformer having a primary side winding, a first secondary side winding and a second secondary side winding, wherein the primary side winding is connected in series with the switch and the first secondary side winding The second secondary winding is connected in series with each other, and it is set to store energy in the primary winding when the switch is turned on, and transfer the energy stored in the primary winding to the first winding when the switch is turned off. The secondary side winding and the second secondary side winding; the first rectification and filtering circuit, coupled to the first secondary side winding, used to rectify and filter the energy received by the first secondary side winding to generate the low-level output DC voltage; and a second rectification and filtering circuit connected across the first secondary winding and the second secondary winding for connecting the first secondary winding to the second secondary The energy received by the side winding is rectified and filtered to generate the high-level output DC voltage.

根据本发明所述的电源转接器，其中该整流器为桥式整流器。According to the power adapter of the present invention, the rectifier is a bridge rectifier.

根据本发明所述的电源转接器，进一步包含脉冲宽度调制器，用以控制该开关的开关切换。According to the power adapter of the present invention, further comprising a pulse width modulator for controlling switching of the switch.

根据本发明所述的电源转接器，进一步包含反馈控制电路，用以检测该低电平输出直流电压的变化以及该高电平输出直流电压的变化，并且根据检测的结果发出反馈信号至该脉冲宽度调制器，以启动该脉冲宽度调制器将该低电平输出直流电压稳定于一预定值以及将该高电平输出直流电压稳定于—预定值。The power adapter according to the present invention further includes a feedback control circuit, which is used to detect the change of the low-level output DC voltage and the change of the high-level output DC voltage, and send a feedback signal to the The pulse width modulator is used to activate the pulse width modulator to stabilize the low-level output DC voltage at a predetermined value and stabilize the high-level output DC voltage at a predetermined value.

根据本发明所述的电源转接器，其中该第一整流滤波电路由整流二极管与滤波电容所组成。According to the power adapter of the present invention, the first rectifying and filtering circuit is composed of a rectifying diode and a filtering capacitor.

根据本发明所述的电源转接器，其中该第二整流滤波电路由整流二极管与滤波电容所组成。According to the power adapter of the present invention, the second rectifying and filtering circuit is composed of a rectifying diode and a filtering capacitor.

由于直流-交流转换器的输入电压的电压值大幅提升，使得直流-交流转换器的电压转换比例下降，因而可大幅减少直流-交流转换器的功率损失并且大幅提升直流-交流转换器的转换效率。Since the voltage value of the input voltage of the DC-AC converter is greatly increased, the voltage conversion ratio of the DC-AC converter is reduced, thereby greatly reducing the power loss of the DC-AC converter and greatly improving the conversion efficiency of the DC-AC converter .

本发明的优点与特征，通过下面实施例配合下列附图的详细说明，能够得到更深入的了解。The advantages and features of the present invention can be better understood through the detailed description of the following embodiments in conjunction with the following drawings.

附图说明 Description of drawings

图1显示一种现有技术的使用于平板显示器的电源供应系统的系统方块图。FIG. 1 shows a system block diagram of a prior art power supply system for a flat panel display.

图2显示图1的电源转接器的电路示意图。FIG. 2 shows a schematic circuit diagram of the power adapter of FIG. 1 .

图3显示本发明的电源转接器应用于平板显示器的电源供应系统的系统方块图。FIG. 3 shows a system block diagram of the power adapter of the present invention applied to a power supply system of a flat panel display.

图4显示本发明的电源转接器的较佳实施例的电路示意图。FIG. 4 shows a schematic circuit diagram of a preferred embodiment of the power adapter of the present invention.

其中，附图标记说明如下：Wherein, the reference signs are explained as follows:

100：电源转接器100: power adapter

101：直流-交流转换器101: DC-AC Converter

102：直流-直流转换器102: DC-DC Converter

Vin：输入交流电压Vin: input AC voltage

Vo：输出直流电压Vo: output DC voltage

201：桥式整流器201: Bridge Rectifier

T21：变压器T21: Transformer

Np21：变压器T21的初级侧绕组Np21: Primary side winding of transformer T21

Ns21：变压器T21的次级侧绕组Ns21: Secondary side winding of transformer T21

S21：主开关S21: main switch

202：脉冲宽度调制器202: Pulse Width Modulator

D21：整流二极管D21: rectifier diode

C21：滤波电容C21: filter capacitor

203：反馈控制电路203: Feedback control circuit

300：电源转接器300: power adapter

301：直流-交流转换器301: DC-AC Converter

302：直流-直流转换器302: DC-DC Converter

Vo1：输出直流电压Vo1: output DC voltage

Vo2：输出直流电压Vo2: output DC voltage

401：桥式整流器401: Bridge Rectifier

T41：变压器T41: Transformer

Np41：变压器T41的初级侧绕组Np41: Primary side winding of transformer T41

Ns41：变压器T41的第一次级侧绕组Ns41: the first secondary side winding of transformer T41

Ns42：变压器T41的第二次级侧绕组Ns42: Secondary side winding of transformer T41

S41：主开关S41: main switch

402：脉冲宽度调制器402: Pulse Width Modulator

D41：整流二极管D41: rectifier diode

C41：滤波电容C41: filter capacitor

D42：整流二极管D42: rectifier diode

C42：滤波电容C42: filter capacitor

403：反馈控制电路403: Feedback control circuit

具体实施方式 Detailed ways

体现本发明的特征与优点的较佳实施例将在后面的说明中详细叙述。应理解的是本发明能够在不同的实施方案中具有各种变化，其均不脱离本发明的范围，且其中的说明及附图标记在本质上是当作说明之用，而非用以限制本发明。Preferred embodiments embodying the features and advantages of the present invention will be described in detail in the ensuing description. It should be understood that the invention is capable of various changes in different embodiments, all without departing from the scope of the invention, and that the description and reference numerals therein are illustrative in nature and not limiting. this invention.

图3显示本发明的电源转接器应用于平板显示器的电源供应系统的系统方块图。如图3所示，电源转接器300设定为提供一个低电平的输出直流电压Vol给直流-直流转换器302来进行电源转换，并且同时提供一个高电平的输出直流电压Vo2给直流-交流转换器301来进行电源转换。由于直流-交流转换器的301输入电源为高电平的直流电压，其电压转换比例便可以下降，使得直流-交流转换器301所产生的功率损失得以减少并且直流-交流转换器301的转换效率得以提高。FIG. 3 shows a system block diagram of the power adapter of the present invention applied to a power supply system of a flat panel display. As shown in FIG. 3 , the power adapter 300 is set to provide a low-level output DC voltage Vol to the DC-DC converter 302 for power conversion, and at the same time provide a high-level output DC voltage Vo2 to DC - AC converter 301 for power conversion. Since the DC-AC converter 301 input power is a high-level DC voltage, its voltage conversion ratio can be reduced, so that the power loss generated by the DC-AC converter 301 can be reduced and the conversion efficiency of the DC-AC converter 301 can be reduced. be improved.

本发明的电源转接器的较佳实施例的电路示意图显示于图4。如图4所示，电源转接器300包含桥式整流器401，其设定为将输入交流电压Vin整流成为全波整流的直流电压，以及变压器T41，具有初级侧绕组Np41、第一次级侧绕组Ns41以及第二次级侧绕组Ns42，其中初级侧绕组Np41设定为与初级侧绕组Np41串联的主开关S41导通时，储存自输入交流电压Vin接收的能量，并且于主开关S41截止时，将所储存的能量传送至第一及第二次级侧绕组Ns41，Ns42。主开关S41的开关切换由脉冲宽度调制器402来控制。电源转接器300还包含第一整流滤波电路以及第二整流滤波电路，其中第一整流滤波电路由整流二极管D41与滤波电容C41所组成且耦接至次级侧绕组Ns41，而第二整流滤波电路由整流二极管D42与滤波电容C42所组成且跨接于第一与第二次级侧绕组Ns41与Ns42。第一整流滤波电路(D41，C41)设定为将第一次级侧绕组Ns41所接收的能量进行整流与滤波以产生所想要的低电平输出直流电压Vo1，而第二整流滤波电路(D42，C42)设定为将第一及第二次级侧绕组Ns41与Ns42所接收的能量进行整流与滤波以产生所想要的高电平输出直流电压Vo2。电源转接器300还包含反馈控制电路403，其设定为检测输出直流电压Vo1与Vo2的变化，并且根据检测的结果发出反馈信号至脉冲宽度调制器402，以启动脉冲宽度调制器402来分别将输出直流电压Vo1与Vo2稳定于一预定值。A schematic circuit diagram of a preferred embodiment of the power adapter of the present invention is shown in FIG. 4 . As shown in FIG. 4, the power adapter 300 includes a bridge rectifier 401, which is configured to rectify the input AC voltage Vin into a full-wave rectified DC voltage, and a transformer T41, which has a primary side winding Np41, a first secondary side The winding Ns41 and the second secondary side winding Ns42, wherein the primary side winding Np41 is set to store the energy received from the input AC voltage Vin when the main switch S41 connected in series with the primary side winding Np41 is turned on, and when the main switch S41 is turned off , and transmit the stored energy to the first and second secondary side windings Ns41, Ns42. Switching of the main switch S41 is controlled by a pulse width modulator 402 . The power adapter 300 also includes a first rectification filter circuit and a second rectification filter circuit, wherein the first rectification filter circuit is composed of a rectifier diode D41 and a filter capacitor C41 and is coupled to the secondary side winding Ns41, and the second rectification filter circuit The circuit is composed of a rectifier diode D42 and a filter capacitor C42 and is connected across the first and second secondary side windings Ns41 and Ns42. The first rectifying and filtering circuit (D41, C41) is set to rectify and filter the energy received by the first secondary side winding Ns41 to generate the desired low-level output DC voltage Vo1, while the second rectifying and filtering circuit ( D42, C42) are set to rectify and filter the energy received by the first and second secondary windings Ns41 and Ns42 to generate the desired high-level output DC voltage Vo2. The power adapter 300 also includes a feedback control circuit 403, which is configured to detect changes in the output DC voltages Vo1 and Vo2, and send a feedback signal to the pulse width modulator 402 according to the detection result, so as to activate the pulse width modulator 402 to respectively The output DC voltages Vo1 and Vo2 are stabilized at a predetermined value.

众所周知，电源转接器300的输出电压的电压值取决于变压器的匝数比(turn ratio)。为了让电源转接器300提供较高电平的输出直流电压给图3所示的直流-交流转换器301来进行电源转换，便需要在变压器T41的次级侧增设一个额外的次级侧绕组来与变压器固有的次级侧绕组串联，以及增设一个额外的整流滤波电路来跨接于变压器T41的次级侧，使得这个额外的整流滤波电路所面对的变压器匝数比为最大。如图4所示，根据本发明的电源转接器300增加了一个额外的第二次级侧绕组Ns42，其与变压器T41的固有第一次级侧绕组Ns41串联，并且电源转接器300增加了一个第二整流滤波电路(D42，C42)，其跨接于第一及第二次级侧绕组Ns41与Ns42。第二整流滤波电路(D42，C42)的输入电压的电压值将会取决于第一及第二次级侧绕组Ns41与Ns42以及初级侧绕组Np41之间的匝数比。在这种情形下，第二整流滤波电路(D42，C42)所提供的输出直流电压Vo2的电压电平会比第一整流滤波电路(D41，C41)所提供的输出直流电压Vo1的电压电平要来的高。As we all know, the voltage value of the output voltage of the power adapter 300 depends on the turn ratio of the transformer. In order for the power adapter 300 to provide a higher level of output DC voltage to the DC-AC converter 301 shown in FIG. 3 for power conversion, it is necessary to add an additional secondary winding on the secondary side of the transformer T41. To be connected in series with the intrinsic secondary side winding of the transformer, and an additional rectification and filtering circuit is added to connect across the secondary side of the transformer T41, so that the transformer turns ratio faced by this additional rectification and filtering circuit is the largest. As shown in FIG. 4, the power adapter 300 according to the present invention adds an additional second secondary winding Ns42, which is connected in series with the inherent first secondary winding Ns41 of the transformer T41, and the power adapter 300 increases A second rectifying and filtering circuit (D42, C42) is provided across the first and second secondary side windings Ns41 and Ns42. The voltage value of the input voltage of the second rectification filter circuit ( D42 , C42 ) will depend on the turns ratio between the first and second secondary side windings Ns41 and Ns42 and the primary side winding Np41 . In this case, the voltage level of the output DC voltage Vo2 provided by the second rectifying and filtering circuit (D42, C42) will be higher than the voltage level of the output DC voltage Vo1 provided by the first rectifying and filtering circuit (D41, C41). To come high.

须注意的是上述的第一整流滤波电路以及第二整流滤波电路的电路结构并非限制于此间所揭示的类型，而可为其它任意的整流滤波元件来完成。例如，第一整流滤波电路或第二整流滤波电路中的整流二极管以及滤波电容可采用功率因数校正升压转换器(PFC boost converter)来取代。It should be noted that the circuit structures of the above-mentioned first rectifying and filtering circuit and the second rectifying and filtering circuit are not limited to the types disclosed herein, but can be completed by any other rectifying and filtering components. For example, the rectifier diodes and filter capacitors in the first rectification and filter circuit or the second rectification and filter circuit can be replaced by a power factor correction boost converter (PFC boost converter).

综合以上所述，本发明的电源转接器是设定为可同时输出低电平直流电压与高电平直流电压，并且分别提供给直流-直流转换器以及直流-交流转换器来进行电源转换。为了让电源转接器能够同时输出低电平直流电压与高电平直流电压，在变压器的次级侧增设一个额外的第二次级侧绕组，其与变压器的固有第一次级侧绕组串联，并且增设一个额外的整流滤波电路，其跨接于变压器的固有第一次级侧绕组以及额外的第二次级侧绕组，使得额外的整流滤波电路所面对的变压器匝数比为最大。于是，额外的整流滤波电路便能够产生比电源转接器固有的整流滤波电路所产生的输出直流电压的电压电平更高的输出直流电压。这个高电平的输出直流电压接着会提供给直流-交流转换器来进行电源转换。由于直流-交流转换器的输入电压的电压值大幅提升，使得直流-交流转换器的电压转换比例下降，因而可大幅减少直流-交流转换器的功率损失并且大幅提升直流-交流转换器的转换效率。Based on the above, the power adapter of the present invention is set to output low-level DC voltage and high-level DC voltage at the same time, and provide them to DC-DC converter and DC-AC converter respectively for power conversion . In order to allow the power adapter to output low-level DC voltage and high-level DC voltage at the same time, an additional second secondary winding is added on the secondary side of the transformer, which is connected in series with the inherent first secondary winding of the transformer , and an additional rectification and filtering circuit is added, which is connected across the inherent first secondary side winding of the transformer and the additional second secondary side winding, so that the transformer turns ratio faced by the additional rectification and filtering circuit is the largest. Therefore, the additional rectification and filtering circuit can generate an output DC voltage with a voltage level higher than that generated by the inherent rectification and filtering circuit of the power adapter. This high-level output DC voltage is then provided to a DC-AC converter for power conversion. Since the voltage value of the input voltage of the DC-AC converter is greatly increased, the voltage conversion ratio of the DC-AC converter is reduced, thereby greatly reducing the power loss of the DC-AC converter and greatly improving the conversion efficiency of the DC-AC converter .

本申请能够由本领域技术人员进行修改，然而均不脱离所附权利要求的保护范围。The application can be modified by a person skilled in the art, without however departing from the scope of protection of the appended claims.