CN112134473A - Power supply - Google Patents

A power supply, comprising: an input stage circuit, a controller, a multi-stage resonance circuit, a transformer, and an output stage circuit. The input stage circuit generates a switching potential according to an input potential. The controller generates a first control potential and a second control potential according to the switching potential. The multi-order resonant circuit provides a reference potential at a first node. The multi-level resonant circuit includes a first current path and a second current path, wherein the first node is coupled to a ground potential via the first current path and the second current path, respectively. The first current path and the second current path are selectively switched on or off in accordance with a first control potential and a second control potential. The output stage circuit generates an output potential according to a transformation potential of the transformer.

电源供应器Power Supplier

技术领域technical field

本发明涉及一种电源供应器，特别涉及一种可增加输出稳定度的电源供应器。The present invention relates to a power supply, in particular to a power supply capable of increasing output stability.

背景技术Background technique

当电子装置由一外部电源进行供电时，由于外部电源不够稳定，有时候会产生“电压瞬时跌落(Voltage Dips)”或是“短时中断(Short Interruption)”的非理想现象。图1是显示外部电源的输入电位与时间的关系图。如图1所示，在第一时期T1内，外部电源的输入电位降低了约30％，其可视为前述的电压瞬时跌落现象；另外，在第二时期T2内，外部电源的输入电位降低了约100％，其可视为前述的短时中断现象。When the electronic device is powered by an external power supply, the external power supply is not stable enough, sometimes an undesirable phenomenon of "voltage dips" or "short interruptions" occurs. Fig. 1 is a graph showing the relationship between the input potential of the external power supply and time. As shown in FIG. 1, in the first period T1, the input potential of the external power supply decreases by about 30%, which can be regarded as the aforementioned instantaneous voltage drop phenomenon; in addition, in the second period T2, the input potential of the external power supply decreases about 100%, which can be regarded as the aforementioned short-term interruption phenomenon.

传统的电源供应器在面临外部电源的电压瞬时跌落或是短时中断时通常仅能提供极短的维持时间(Holding-up Time)，其难以符合国际电工委员会(IEC)的规范。有鉴于此，势必要提出一种全新的解决方案，以克服现有技术所面临的问题。Conventional power supplies usually only provide a very short holding-up time in the face of instantaneous voltage drop or short-term interruption of external power supply, which is difficult to comply with the International Electrotechnical Commission (IEC) specification. In view of this, it is necessary to propose a new solution to overcome the problems faced by the existing technology.

发明内容SUMMARY OF THE INVENTION

在优选实施例中，本发明提出一种电源供应器，包括：一输入级电路，根据一输入电位来产生一切换电位；一控制器，检测该切换电位，其中该控制器是根据该切换电位来产生一第一控制电位和一第二控制电位；一多阶共振电路，于一第一节点处提供一参考电位，其中该多阶共振电路包括一第一电流路径和一第二电流路径，该第一节点是分别经由该第一电流路径和该第二电流路径耦接至一接地电位，该第一电流路径是根据该第一控制电位来选择性地导通或断开，而该第二电流路径是根据该第二控制电位来选择性地导通或断开；一变压器，根据该切换电位和该参考电位之间的一电位差来产生一变压电位；以及一输出级电路，根据该变压电位来产生一输出电位。In a preferred embodiment, the present invention provides a power supply, comprising: an input stage circuit for generating a switching potential according to an input potential; a controller for detecting the switching potential, wherein the controller is based on the switching potential to generate a first control potential and a second control potential; a multi-order resonant circuit provides a reference potential at a first node, wherein the multi-order resonant circuit includes a first current path and a second current path, The first node is coupled to a ground potential via the first current path and the second current path, respectively, the first current path is selectively turned on or off according to the first control potential, and the first current path is selectively turned on or off according to the first control potential. Two current paths are selectively turned on or off according to the second control potential; a transformer, which generates a transformer potential according to a potential difference between the switching potential and the reference potential; and an output stage circuit, An output potential is generated according to the transformed potential.

附图说明Description of drawings

图1是显示外部电源的输入电位与时间的关系图。Fig. 1 is a graph showing the relationship between the input potential of the external power supply and time.

图2是显示根据本发明一实施例所述的电源供应器的示意图。FIG. 2 is a schematic diagram illustrating a power supply according to an embodiment of the present invention.

图3是显示根据本发明一实施例所述的电源供应器的示意图。FIG. 3 is a schematic diagram illustrating a power supply according to an embodiment of the present invention.

图4是显示根据本发明一实施例所述的二阶谐振回路的等效电路图。FIG. 4 is an equivalent circuit diagram showing a second-order resonant tank according to an embodiment of the present invention.

图5是显示根据本发明一实施例所述的电源供应器的电位波形图。FIG. 5 is a potential waveform diagram showing a power supply according to an embodiment of the present invention.

图6是显示根据本发明另一实施例所述的电源供应器的示意图。FIG. 6 is a schematic diagram illustrating a power supply according to another embodiment of the present invention.

图7是显示根据本发明另一实施例所述的三阶谐振回路的等效电路图。FIG. 7 is an equivalent circuit diagram showing a third-order resonant tank according to another embodiment of the present invention.

图8是显示根据本发明另一实施例所述的电源供应器的电位波形图。FIG. 8 is a potential waveform diagram showing a power supply according to another embodiment of the present invention.

附图标记说明：Description of reference numbers:

200、300、600～电源供应器；200, 300, 600 ~ power supply;

210、310～输入级电路；210, 310 ~ input stage circuit;

220、320、620～控制器；220, 320, 620 ~ controller;

230、330、630～多阶共振电路；230, 330, 630 ~ multi-order resonance circuit;

231、331～第一电流路径；231, 331 to the first current path;

232、332～第二电流路径；232, 332 to the second current path;

240、340～变压器；240, 340 ~ transformer;

250、350～输出级电路；250, 350 ~ output stage circuit;

312～交流对直流转换器；312～AC to DC converter;

333～第三电流路径；333～the third current path;

341～主线圈；341～Main coil;

342～副线圈；342～Secondary coil;

C1～第一电容器；C1 ~ the first capacitor;

C2～第二电容器；C2 ~ the second capacitor;

C3～第三电容器；C3 ~ the third capacitor;

D1～二极管；D1～diode;

L1～第一电感器；L1～the first inductor;

L2～第二电感器；L2 ~ the second inductor;

M1～第一晶体管；M1～the first transistor;

M2～第二晶体管；M2～the second transistor;

M3～第三晶体管；M3 ~ the third transistor;

N1～第一节点；N1 ~ the first node;

N2～第二节点；N2 to the second node;

N3～第三节点；N3 to the third node;

N4～第四节点；N4 to the fourth node;

N5～第五节点；N5 ~ fifth node;

NIN～输入节点；NIN ~ input node;

NOUT～输出节点；NOUT ~ output node;

T1～第一时期；T1 ~ the first period;

T2～第二时期；T2 to the second period;

VC1～第一控制电位；VC1～the first control potential;

VC2～第二控制电位；VC2～the second control potential;

VC3～第三控制电位；VC3 ~ the third control potential;

VD～电位差；VD～potential difference;

VIN～输入电位；VIN～input potential;

VOUT～输出电位；VOUT～output potential;

VR～参考电位；VR～reference potential;

VSS～接地电位；VSS～ground potential;

VT～变压电位；VT ~ transformer potential;

VTH1～第一临界电位；VTH1～the first critical potential;

VTH2～第二临界电位；VTH2～the second critical potential;

VTH3～第三临界电位；VTH3 ~ the third critical potential;

VW～切换电位。VW～Switching potential.

具体实施方式Detailed ways

为让本发明的目的、特征和优点能更明显易懂，下文特举出本发明的具体实施例，并配合说明书附图，作详细说明如下。In order to make the objects, features and advantages of the present invention more clearly understood, the following specific embodiments of the present invention are given and described in detail with reference to the accompanying drawings.

图2是显示根据本发明一实施例所述的电源供应器200的示意图。例如，电源供应器200可应用于台式电脑、笔记本电脑，或一体成形电脑。如图2所示，电源供应器200包括：一输入级电路210、一控制器220、一多阶共振电路230、一变压器240，以及一输出级电路250。输入级电路210是根据一输入电位VIN来产生一切换电位VW。输入电位VIN可来自一外部电源，其中输入电位VIN可为具有任意频率和任意振幅的一交流电位。例如，输入电位VIN的频率可约为50Hz，而输入电位VIN的振幅方均根值可约为100V，但亦不仅限于此。控制器220可为一集成电路芯片，其可先检测切换电位VW，然后再根据切换电位VW来产生一第一控制电位VC1和一第二控制电位VC2。多阶共振电路230可于一第一节点N1处提供一参考电位VR。详细而言，多阶共振电路230包括一第一电流路径231和一第二电流路径232，其中第一节点N1是分别经由第一电流路径231和第二电流路径232耦接至一接地电位VSS(例如：0V)。第一电流路径231是根据第一控制电位VC1来选择性地导通(Closed)或断开(Open)，而第二电流路径232是根据第二控制电位VC2来选择性地导通或断开。变压器240是根据切换电位VW和参考电位VR之间的一电位差VD来产生一变压电位VT。输出级电路250是根据变压电位VT来产生一输出电位VOUT。输出电位VOUT可为具有任意电平的一直流电位。例如，输出电位VOUT的电平可大致为恒定的19V，但亦不仅限于此。根据实际测量结果，这种电路设计方式有助于增加电源供应器200的输出稳定度。必须注意的是，虽然未显示于图2中，但电源供应器200还可包括其他元件，例如：一稳压器(Voltage Regulator)或(且)一负反馈电路。FIG. 2 is a schematic diagram illustrating a power supply 200 according to an embodiment of the present invention. For example, the power supply 200 can be applied to a desktop computer, a notebook computer, or an all-in-one computer. As shown in FIG. 2 , the power supply 200 includes: an input stage circuit 210 , a controller 220 , a multi-order resonance circuit 230 , a transformer 240 , and an output stage circuit 250 . The input stage circuit 210 generates a switching potential VW according to an input potential VIN. The input potential VIN can come from an external power source, wherein the input potential VIN can be an AC potential with any frequency and any amplitude. For example, the frequency of the input potential VIN may be about 50Hz, and the RMS value of the amplitude of the input potential VIN may be about 100V, but not limited thereto. The controller 220 can be an integrated circuit chip, which can first detect the switching potential VW, and then generate a first control potential VC1 and a second control potential VC2 according to the switching potential VW. The multi-order resonance circuit 230 can provide a reference potential VR at a first node N1. In detail, the multi-order resonance circuit 230 includes a first current path 231 and a second current path 232 , wherein the first node N1 is coupled to a ground potential VSS via the first current path 231 and the second current path 232 , respectively (Example: 0V). The first current path 231 is selectively turned on (Closed) or turned off (Open) according to the first control potential VC1, and the second current path 232 is selectively turned on or off according to the second control potential VC2 . The transformer 240 generates a transformed potential VT according to a potential difference VD between the switching potential VW and the reference potential VR. The output stage circuit 250 generates an output potential VOUT according to the voltage transformation potential VT. The output potential VOUT may be a DC potential having an arbitrary level. For example, the level of the output potential VOUT may be approximately constant at 19V, but it is not limited to this. According to the actual measurement results, this circuit design helps to increase the output stability of the power supply 200 . It should be noted that, although not shown in FIG. 2 , the power supply 200 may also include other components, such as a voltage regulator or/and a negative feedback circuit.

以下实施例将介绍电源供应器200的详细结构及操作方式。必须理解的是，这些附图和叙述仅为举例，而非用于限制本发明的范围。The following embodiments will introduce the detailed structure and operation of the power supply 200 . It must be understood that these drawings and descriptions are by way of example only, and are not intended to limit the scope of the present invention.

图3是显示根据本发明一实施例所述的电源供应器300的示意图。在图3的实施例中，电源供应器300具有一输入节点NIN和一输出节点NOUT，并包括一输入级电路310、一控制器320、一多阶共振电路330、一变压器340，以及一输出级电路350。电源供应器300的输入节点NIN可由一外部电源处接收一输入电位VIN，而电源供应器300的输出节点NOUT可用于输出一输出电位VOUT至一电子装置(例如：一体成形电脑)。多阶共振电路330包括一第一电流路径331和一第二电流路径332。多阶共振电路230可于一第一节点N1处提供一参考电位VR，其中第一节点N1是分别经由第一电流路径331和第二电流路径332耦接至一接地电位VSS。FIG. 3 is a schematic diagram illustrating a power supply 300 according to an embodiment of the present invention. In the embodiment of FIG. 3, the power supply 300 has an input node NIN and an output node NOUT, and includes an input stage circuit 310, a controller 320, a multi-order resonance circuit 330, a transformer 340, and an output stage circuit 350 . The input node NIN of the power supply 300 can receive an input potential VIN from an external power source, and the output node NOUT of the power supply 300 can be used to output an output potential VOUT to an electronic device (eg, an all-in-one computer). The multi-order resonance circuit 330 includes a first current path 331 and a second current path 332 . The multi-order resonance circuit 230 can provide a reference potential VR at a first node N1, wherein the first node N1 is coupled to a ground potential VSS through the first current path 331 and the second current path 332, respectively.

输入级电路310包括一交流转直流转换器312和一第一电容器C1。交流对直流转换器312可将输入节点NIN处的输入电位VIN转换为于一第二节点N2处的一切换电位VW。第一电容器C1具有一第一端和一第二端，其中第一电容器C1的第一端是耦接于至第二节点N2，而第一电容器C1的第二端是耦接至接地电位VSS。控制器320用于检测切换电位VW，再根据切换电位VW来产生一第一控制电位VC1和一第二控制电位VC2。在一些实施例中，第一控制电位VC1为具有任意频率和任意工作周期的一时钟(Clock)。The input stage circuit 310 includes an AC-to-DC converter 312 and a first capacitor C1. The AC-to-DC converter 312 can convert the input potential VIN at the input node NIN to a switching potential VW at a second node N2. The first capacitor C1 has a first end and a second end, wherein the first end of the first capacitor C1 is coupled to the second node N2, and the second end of the first capacitor C1 is coupled to the ground potential VSS . The controller 320 is used for detecting the switching potential VW, and then generating a first control potential VC1 and a second control potential VC2 according to the switching potential VW. In some embodiments, the first control potential VC1 is a clock with any frequency and any duty cycle.

多阶共振电路330的第一电流路径331包括一第一晶体管M1。例如，第一晶体管M1可以是一N型金属氧化物半导体场效晶体管。第一晶体管M1具有一控制端、一第一端，以及一第二端，其中第一晶体管M1的控制端用于接收第一控制电位VC1，第一晶体管M1的第一端是耦接至接地电位VSS，而第一晶体管M1的第二端是耦接至第一节点N1。The first current path 331 of the multi-order resonance circuit 330 includes a first transistor M1. For example, the first transistor M1 may be an N-type metal-oxide-semiconductor field effect transistor. The first transistor M1 has a control terminal, a first terminal, and a second terminal, wherein the control terminal of the first transistor M1 is used to receive the first control potential VC1, and the first terminal of the first transistor M1 is coupled to ground potential VSS, and the second end of the first transistor M1 is coupled to the first node N1.

多阶共振电路330的第二电流路径332包括一第二电容器C2和一第二晶体管M2。例如，第二晶体管M2可以是一N型金属氧化物半导体场效晶体管。第二电容器C2具有一第一端和一第二端，其中第二电容器C2的第一端是耦接于至第一节点N1，而第二电容器C2的第二端是耦接至一第三节点N3。第二晶体管M2具有一控制端、一第一端，以及一第二端，其中第二晶体管M2的控制端用于接收第二控制电位VC2，第二晶体管M2的第一端是耦接至接地电位VSS，而第二晶体管M2的第二端是耦接至第三节点N3。The second current path 332 of the multi-order resonance circuit 330 includes a second capacitor C2 and a second transistor M2. For example, the second transistor M2 may be an N-type metal-oxide-semiconductor field effect transistor. The second capacitor C2 has a first end and a second end, wherein the first end of the second capacitor C2 is coupled to the first node N1, and the second end of the second capacitor C2 is coupled to a third Node N3. The second transistor M2 has a control terminal, a first terminal, and a second terminal, wherein the control terminal of the second transistor M2 is used to receive the second control potential VC2, and the first terminal of the second transistor M2 is coupled to ground potential VSS, and the second end of the second transistor M2 is coupled to the third node N3.

变压器340包括一主线圈341、一副线圈342，以及一第一电感器L1。主线圈341具有一第一端和一第二端，其中主线圈341的第一端是耦接至第二节点N2以接收切换电位VW，而主线圈341的第二端是耦接至第一节点N1以接收参考电位VR。副线圈342具有一第一端和一第二端，其中副线圈342的第一端是耦接至一第四节点N4以输出一变压电位VT，而副线圈342的第二端是耦接至接地电位VSS。变压电位VT的电平可与切换电位VW和参考电位VR之间的一电位差VD成正比关系。第一电感器L1可代表变压器340的一激磁电感值。第一电感器L1具有一第一端和一第二端，其中第一电感器L1的第一端是耦接至第二节点N2，而第一电感器L1的第二端是耦接至第一节点N1。The transformer 340 includes a main coil 341, a secondary coil 342, and a first inductor L1. The main coil 341 has a first end and a second end, wherein the first end of the main coil 341 is coupled to the second node N2 to receive the switching potential VW, and the second end of the main coil 341 is coupled to the first The node N1 receives the reference potential VR. The secondary coil 342 has a first end and a second end, wherein the first end of the secondary coil 342 is coupled to a fourth node N4 to output a voltage transformation potential VT, and the second end of the secondary coil 342 is coupled to to ground potential VSS. The level of the transformation potential VT may be proportional to a potential difference VD between the switching potential VW and the reference potential VR. The first inductor L1 may represent a magnetizing inductance value of the transformer 340 . The first inductor L1 has a first end and a second end, wherein the first end of the first inductor L1 is coupled to the second node N2, and the second end of the first inductor L1 is coupled to the second node N2. A node N1.

输出级电路350包括一二极管D1和一第三电容器C3。二极管D1具有一阳极和一阴极，其中二极管D1的阳极是耦接至第四节点N4，而二极管D1的阴极是耦接至输出节点NOUT以输出前述的输出电位VOUT。第三电容器C3具有一第一端和一第二端，其中第三电容器C3的第一端是耦接至输出节点NOUT，而第三电容器C3的第二端是耦接至接地电位VSS。The output stage circuit 350 includes a diode D1 and a third capacitor C3. The diode D1 has an anode and a cathode, wherein the anode of the diode D1 is coupled to the fourth node N4, and the cathode of the diode D1 is coupled to the output node NOUT to output the aforementioned output potential VOUT. The third capacitor C3 has a first terminal and a second terminal, wherein the first terminal of the third capacitor C3 is coupled to the output node NOUT, and the second terminal of the third capacitor C3 is coupled to the ground potential VSS.

电源供应器300的操作原理可如下列所述。初始时，切换电位VW是等于接地电位VSS，而第二晶体管M2为禁能状态。接着，电源供应器300是耦接至外部电源以接收输入电位VIN，使得第一电容器C1进行充电且切换电位VW逐渐上升。当检测出切换电位VW已上升达到一第一临界电位VTH1时，控制器320即通过拉升第二控制电位VC2来致能第二晶体管M2。因此，第一电容器C1、第一电感器L1，以及第二电容器C2彼此开始发生共振，以形成一二阶谐振回路。图4是显示根据本发明一实施例所述的二阶谐振回路的等效电路图。The operation principle of the power supply 300 may be as follows. Initially, the switching potential VW is equal to the ground potential VSS, and the second transistor M2 is disabled. Next, the power supply 300 is coupled to an external power source to receive the input potential VIN, so that the first capacitor C1 is charged and the switching potential VW is gradually increased. When it is detected that the switching potential VW has risen to a first threshold potential VTH1, the controller 320 enables the second transistor M2 by pulling up the second control potential VC2. Therefore, the first capacitor C1, the first inductor L1, and the second capacitor C2 start to resonate with each other to form a second-order resonant tank. FIG. 4 is an equivalent circuit diagram showing a second-order resonant tank according to an embodiment of the present invention.

图5是显示根据本发明一实施例所述的电源供应器300的电位波形图。根据图5的测量结果，在使用二阶谐振回路之后，切换电位VW会再上升至一第二临界电位VTH2，其中第二临界电位VTH2可大致等于第一临界电位VTH1的2倍。必须注意的是，当外部电源发生电压瞬时跌落或是短时中断时，电源供应器300的维持时间可如下列方程式(1)所述：FIG. 5 is a potential waveform diagram showing the power supply 300 according to an embodiment of the present invention. According to the measurement result of FIG. 5 , after the second-order resonant tank is used, the switching potential VW will rise to a second threshold potential VTH2 , wherein the second threshold potential VTH2 may be approximately equal to twice the first threshold potential VTH1 . It must be noted that when the external power supply has a voltage drop or a short-term interruption, the maintenance time of the power supply 300 can be described as the following equation (1):

其中“C1”代表第一电容器C1的电容值，“VW”代表切换电位VW的电平，“P”代表电源供应器300的输出功率，而“T”代表电源供应器300的维持时间。"C1" represents the capacitance value of the first capacitor C1, "VW" represents the level of the switching potential VW, "P" represents the output power of the power supply 300, and "T" represents the maintenance time of the power supply 300.

根据方程式(1)可知，电源供应器300的维持时间是与切换电位VW的平方成正比关系。因此，通过加入二阶谐振回路以拉高切换电位VW的设计可大幅提升电源供应器300的维持时间。假设输入电位VIN的频率为50Hz且输入电位VIN的振幅方均根值为100V，则传统的电源供应器与所提的电源供应器300的操作特性比较可如下列表一所述：According to equation (1), it can be known that the holding time of the power supply 300 is proportional to the square of the switching potential VW. Therefore, the maintenance time of the power supply 300 can be greatly improved by adding a second-order resonant tank to increase the switching potential VW. Assuming that the frequency of the input potential VIN is 50Hz and the rms value of the amplitude of the input potential VIN is 100V, the comparison of the operating characteristics of the conventional power supply and the proposed power supply 300 can be described in Table 1 below:

表一：传统的电源供应器与所提的电源供应器300的比较Table 1: Comparison between the conventional power supply and the proposed power supply 300

在一些实施例中，电源供应器300的元件参数可如下列所述。第一电容器C1的电容值可介于90μF至110μF之间，优选为100μF。第二电容器C2的电容值可介于297pF至363pF之间，优选为330pF。第三电容器C3的电容值可介于612μF至748μF之间，优选为680μF。第一电感器L1的电感值(Inductance)可介于450mH至550mH之间，优选为500mH。主线圈341对副线圈342的匝数比值可介于1至10之间，优选为5。以上参数范围是根据多次实验结果而得出，其有助于最佳化电源供应器300的转换效率和维持时间。In some embodiments, the component parameters of the power supply 300 may be as follows. The capacitance value of the first capacitor C1 may be between 90 μF and 110 μF, preferably 100 μF. The capacitance value of the second capacitor C2 may be between 297pF and 363pF, preferably 330pF. The capacitance value of the third capacitor C3 may be between 612 μF and 748 μF, preferably 680 μF. The inductance of the first inductor L1 may be between 450mH and 550mH, preferably 500mH. The turns ratio of the primary coil 341 to the secondary coil 342 may be between 1 and 10, preferably 5. The above parameter ranges are obtained according to multiple experimental results, which help to optimize the conversion efficiency and maintenance time of the power supply 300 .

图6是显示根据本发明另一实施例所述的电源供应器600的示意图。图6和图3相似。在图6的实施例中，电源供应器600的一控制器620还根据切换电位VW来产生一第三控制电位VC3，而电源供应器600的一多阶共振电路630还包括一第三电流路径333。详细而言，多阶共振电路630的第一节点N1更经由第三电流路径333耦接至接地电位VSS，其中第三电流路径333是根据第三控制电位VC3来选择性地导通或断开。FIG. 6 is a schematic diagram illustrating a power supply 600 according to another embodiment of the present invention. Figure 6 is similar to Figure 3. In the embodiment of FIG. 6 , a controller 620 of the power supply 600 further generates a third control potential VC3 according to the switching potential VW, and a multi-order resonance circuit 630 of the power supply 600 further includes a third current path 333. In detail, the first node N1 of the multi-order resonance circuit 630 is further coupled to the ground potential VSS via the third current path 333, wherein the third current path 333 is selectively turned on or off according to the third control potential VC3 .

多阶共振电路630的第三电流路径333包括一第二电感器L2和一第三晶体管M3。例如，第三晶体管M3可以是一N型金属氧化物半导体场效晶体管。第二电感器L2具有一第一端和一第二端，其中第二电感器L2的第一端是耦接于至第一节点N1，而第二电感器L2的第二端是耦接至一第五节点N5。例如，第二电感器L2的电感值可介于4.5μH至5.5μH之间，优选为5μH。第三晶体管M3具有一控制端、一第一端，以及一第二端，其中第三晶体管M3的控制端用于接收第三控制电位VC3，第三晶体管M3的第一端是耦接至接地电位VSS，而第三晶体管M3的第二端是耦接至第五节点N5。The third current path 333 of the multi-order resonance circuit 630 includes a second inductor L2 and a third transistor M3. For example, the third transistor M3 may be an N-type metal-oxide-semiconductor field effect transistor. The second inductor L2 has a first end and a second end, wherein the first end of the second inductor L2 is coupled to the first node N1, and the second end of the second inductor L2 is coupled to A fifth node N5. For example, the inductance value of the second inductor L2 may be between 4.5 μH and 5.5 μH, preferably 5 μH. The third transistor M3 has a control terminal, a first terminal, and a second terminal, wherein the control terminal of the third transistor M3 is used to receive the third control potential VC3, and the first terminal of the third transistor M3 is coupled to ground potential VSS, and the second end of the third transistor M3 is coupled to the fifth node N5.

相似地，电源供应器600的操作原理可如下列所述。初始时，第三晶体管M3为禁能状态。当检测出切换电位VW已上升达到高于第一临界电位VTH1的第二临界电位VTH2时，控制器620即通过拉升第三控制电位VC3来致能第三晶体管M3。因此，第一电容器C1、第一电感器L1、第二电容器C2，以及第二电感器L2彼此开始发生共振，以形成一三阶谐振回路(Third-Order Resonant Loop)。图7是显示根据本发明另一实施例所述的三阶谐振回路的等效电路图。Similarly, the principle of operation of the power supply 600 may be as follows. Initially, the third transistor M3 is in a disabled state. When it is detected that the switching potential VW has risen to reach the second threshold potential VTH2 higher than the first threshold potential VTH1, the controller 620 enables the third transistor M3 by pulling up the third control potential VC3. Therefore, the first capacitor C1, the first inductor L1, the second capacitor C2, and the second inductor L2 start to resonate with each other to form a third-order resonant loop (Third-Order Resonant Loop). FIG. 7 is an equivalent circuit diagram showing a third-order resonant tank according to another embodiment of the present invention.

图8是显示根据本发明另一实施例所述的电源供应器600的电位波形图。根据图8的测量结果，在使用三阶谐振回路之后，切换电位VW会再上升至一第三临界电位VTH3，其中第三临界电位VTH3可大致等于第二临界电位VTH2的

倍。根据方程式(1)可知，电源供应器600的维持时间是与切换电位VW的平方成正比关系。因此，通过加入三阶谐振回路以拉高切换电位VW的设计可进一步提升电源供应器600的维持时间。假设输入电位VIN的频率为50Hz且输入电位VIN的振幅方均根值为100V，则传统的电源供应器与所提的电源供应器600的操作特性比较可如下列表二所述：FIG. 8 is a potential waveform diagram showing a power supply 600 according to another embodiment of the present invention. According to the measurement result of FIG. 8 , after the third-order resonant tank is used, the switching potential VW will rise to a third threshold potential VTH3, wherein the third threshold potential VTH3 may be approximately equal to the second threshold potential VTH2

times. According to equation (1), the holding time of the power supply 600 is proportional to the square of the switching potential VW. Therefore, the maintenance time of the power supply 600 can be further improved by adding a third-order resonant tank to increase the switching potential VW. Assuming that the frequency of the input potential VIN is 50Hz and the rms value of the amplitude of the input potential VIN is 100V, the operation characteristics of the conventional power supply and the proposed power supply 600 can be compared as shown in Table 2 below:

输入电位的最大值Maximum value of input potential 维持时间maintenance time 传统的电源供应器traditional power supply 141V141V 15.4ms15.4ms 电源供应器600Power Supply 600 400V400V 123ms123ms

表二：传统的电源供应器与所提的电源供应器600的比较Table 2: Comparison between the conventional power supply and the proposed power supply 600

本发明提出一种新颖的电源供应器，其包括可增加电容存储能量的多阶共振电路。根据实际测量结果，使用前述多阶共振电路的电源供应器可具有更长的维持时间，以符合国际电工委员会的规范。另外，本发明分次拉升电位的设计还可避免电路元件发生过载损坏。大致而言，本发明相较于传统设计至少具有较高输出稳定度的优势，故其很适合应用于各种各式的电子装置当中。The present invention proposes a novel power supply including a multi-order resonant circuit capable of increasing the energy stored in the capacitor. According to the actual measurement results, the power supply using the above-mentioned multi-order resonance circuit can have a longer maintenance time to meet the specifications of the International Electrotechnical Commission. In addition, the design of pulling up the potential step by step of the present invention can also avoid overload damage to circuit elements. Generally speaking, the present invention at least has the advantage of higher output stability compared with the traditional design, so it is very suitable for application in various electronic devices.

值得注意的是，以上所述的电位、电流、电阻值、电感值、电容值，以及其余元件参数均非为本发明的限制条件。设计者可以根据不同需要调整这些设定值。本发明的电源供应器并不仅限于图1至图8所图示的状态。本发明可以仅包括图1至图8的任何一或多个实施例的任何一或多个项特征。换言之，并非所有图示的特征均须同时实施于本发明的电源供应器当中。虽然本发明的实施例是使用金属氧化物半导体场效晶体管为例，但本发明并不仅限于此，本技术领域人士可改用其他种类的晶体管，例如：双载子接面晶体管、接面场效晶体管，或是鳍式场效晶体管等等，而不致于影响本发明的效果。It should be noted that the above-mentioned potential, current, resistance value, inductance value, capacitance value, and other component parameters are not limitations of the present invention. Designers can adjust these settings according to different needs. The power supply of the present invention is not limited to the states illustrated in FIGS. 1 to 8 . The present invention may include only any one or more of the features of any one or more of the embodiments of Figures 1-8. In other words, not all of the illustrated features need to be simultaneously implemented in the power supply of the present invention. Although the embodiments of the present invention use metal oxide semiconductor field effect transistors as an example, the present invention is not limited to this, and those skilled in the art can use other types of transistors, such as bipolar junction transistors, junction field transistors effect transistors, or fin field effect transistors, etc., so as not to affect the effect of the present invention.

在本说明书以及权利要求中的序数，例如“第一”、“第二”、“第三”等等，彼此之间并没有顺序上的先后关系，其仅用于标示区分两个具有相同名字的不同元件。The ordinal numbers in this specification and the claims, such as "first", "second", "third", etc., do not have a sequential relationship with each other, and are only used to identify two people with the same name. different components.

本发明虽以优选实施例公开如上，然其并非用以限定本发明的范围，任何本领域技术人员，在不脱离本发明的构思和范围内，当可做些许的变动与润饰，因此本发明的保护范围当视权利要求所界定者为准。Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the scope of the present invention. Any person skilled in the art can make some changes and modifications without departing from the concept and scope of the present invention. Therefore, the present invention The scope of protection shall be subject to those defined in the claims.