TWI477031B

TWI477031B - Power supply device

Info

Publication number: TWI477031B
Application number: TW101123261A
Authority: TW
Inventors: Yung Hsiang Shih; Chang Hsun Chiang
Original assignee: Fsp Technology Inc
Priority date: 2012-06-28
Filing date: 2012-06-28
Publication date: 2015-03-11
Also published as: TW201401719A

Description

電源供應裝置Power supply unit

本發明是有關於一種電源供應技術，且特別是有關於一種適用於桌上型電腦系統的單級降壓式電源供應裝置。The present invention relates to a power supply technology, and more particularly to a single stage buck power supply suitable for use in a desktop computer system.

為使桌上型個人電腦(desktop PC)能夠正常的運作，必須藉由電源供應裝置(power supply device)提供穩定的直流電源(DC power)給桌上型電腦系統(desktop system)使用。以現今的電源供應裝置之架構而言，有一類電源供應裝置的架構為單級降壓式(one stage buck)，但由於此類的電源供應裝置常常在所接收之市電發生斷電或跳電時就立即停止供應直流電源，以至於很有可能會造成桌上型電腦系統發生異常或者無法恢復的損毀。In order for a desktop PC to function properly, a stable power supply (DC power) must be provided to the desktop system by a power supply device. In terms of the architecture of today's power supply devices, one type of power supply is constructed as a single stage buck, but such power supply devices often have power outages or power outages at the received mains. The supply of DC power is immediately stopped, so that it is likely to cause an abnormality or unrecoverable damage to the desktop system.

有鑒於此，本發明提供一種適用於桌上型電腦系統的單級降壓式電源供應裝置，其得以在所接收之市電發生斷電或跳電時仍可提供桌上型電腦系統所需的直流電源於一段保持時間(hold up time)。In view of the above, the present invention provides a single-stage buck power supply device suitable for a desktop computer system, which can provide the desktop computer system required when the received mains power is cut off or jumped. The DC power supply is held up for a period of time.

本發明所提供的電源供應裝置可以包括有第一電源轉換級、單級降壓式模組、升壓線路，以及輔助電源模組。其中，第一電源轉換級用以接收交流電壓，並對所述交流電壓進行整流與濾波後而提供第一直流電壓。單級降壓式模組耦接於第一電源轉換級與輸出端之間，用以反應於第一脈寬調變訊號而對所述第一直流電壓進行直接降壓，藉以透過所述輸出端提供主電源給電腦系統。The power supply device provided by the present invention may include a first power conversion stage, a single-stage buck module, a boost line, and an auxiliary power module. The first power conversion stage is configured to receive an AC voltage, and rectify and filter the AC voltage to provide a first DC voltage. Single stage buck The module is coupled between the first power conversion stage and the output end for directly stepping down the first DC voltage in response to the first pulse width modulation signal, thereby providing main power to the output terminal computer system.

升壓線路耦接單級降壓式模組，用以反應於所述第一脈寬調變訊號而透過單級降壓式模組以對所述第一直流電壓進行升壓，從而提供第二直流電壓。輔助電源模組耦接所述輸出端與升壓線路，用以反應於第二脈寬調變訊號而對所述第二直流電壓進行降壓，並且反應於致能訊號而於所述主電源低於一預設值時提供輔助主電源至所述輸出端。The boosting line is coupled to the single-stage buck module for reacting to the first pulse width modulation signal and boosting the first DC voltage through the single-stage buck module to provide the Two DC voltages. The auxiliary power module is coupled to the output terminal and the boosting circuit for bucking the second DC voltage in response to the second pulse width modulation signal, and reacting to the enable signal to the main power source An auxiliary main power source is supplied to the output terminal below a predetermined value.

於本發明的一實施例中，第一電源轉換級可以包括有全橋整流器與第一電容。其中，全橋整流器用以接收所述交流電壓，並對所述交流電壓進行全波整流後而輸出所述第一直流電壓。第一電容耦接全橋整流器，用以對全橋整流器所輸出的第一直流電壓進行濾波。In an embodiment of the invention, the first power conversion stage may include a full bridge rectifier and a first capacitor. The full bridge rectifier is configured to receive the alternating voltage and perform full-wave rectification on the alternating voltage to output the first direct current voltage. The first capacitor is coupled to the full bridge rectifier for filtering the first DC voltage output by the full bridge rectifier.

於本發明的一實施例中，單級降壓式模組可以包括有主變壓器與返馳式降壓轉換器。其中，主變壓器具有一次側與二次側，且主變壓器之一次側的第一端用以接收所述第一直流電壓。返馳式降壓轉換器耦接於主變壓器的二次側與所述輸出端之間，用以透過所述輸出端而提供所述主電源給電腦系統。In an embodiment of the invention, the single stage buck module may include a main transformer and a flyback buck converter. Wherein, the main transformer has a primary side and a secondary side, and the first end of the primary side of the main transformer is configured to receive the first DC voltage. The flyback buck converter is coupled between the secondary side of the main transformer and the output terminal for providing the main power to the computer system through the output end.

於本發明的一實施例中，升壓線路可以包括有第一功率開關、第一二極體、熱敏電阻，以及第二電容。其中，第一功率開關的第一端耦接主變壓器之一次側的第二端，第一功率開關的第二端耦接至接地電位，而第一功率開關的控制端則用以接收所述第一脈寬調變訊號。第一二極體的陽極耦接第一功率開關的第一端。熱敏電阻的第一端耦接第一二極體的陰極，而熱敏電阻的第二端則用以輸出所述第二直流電壓。第二電容的第一端耦接熱敏電阻的第二端，而第二電容的第二端則耦接至接地電位。In an embodiment of the invention, the boosting circuit may include a first power switch, a first diode, a thermistor, and a second capacitor. Wherein the first end of the first power switch is coupled to the second end of the primary side of the main transformer, The second end of the first power switch is coupled to the ground potential, and the control end of the first power switch is configured to receive the first pulse width modulation signal. The anode of the first diode is coupled to the first end of the first power switch. The first end of the thermistor is coupled to the cathode of the first diode, and the second end of the thermistor is configured to output the second DC voltage. The first end of the second capacitor is coupled to the second end of the thermistor, and the second end of the second capacitor is coupled to the ground potential.

於本發明的一實施例中，輔助電源模組可以包括有輔助變壓器、第二功率開關、第二電源轉換級，以及開關元件。其中，輔助變壓器具有一次側與第一二次側，且輔助變壓器之一次側的第一端用以接收所述第二直流電壓。第二功率開關的第一端耦接輔助變壓器之一次側的第二端，第二功率開關的第二端耦接至接地電位，而第二功率開關的控制端則用以接收所述第二脈寬調變訊號。第二電源轉換級耦接輔助變壓器的第一二次側，用以提供所述輔助主電源。開關元件的第一端耦接第二電源轉換級以接收所述輔助主電源，開關元件的第二端耦接所述輸出端，而開關元件的控制端則用以接收所述致能訊號。In an embodiment of the invention, the auxiliary power module may include an auxiliary transformer, a second power switch, a second power conversion stage, and a switching element. The auxiliary transformer has a primary side and a first secondary side, and a first end of the primary side of the auxiliary transformer is configured to receive the second DC voltage. The first end of the second power switch is coupled to the second end of the primary side of the auxiliary transformer, the second end of the second power switch is coupled to the ground potential, and the control end of the second power switch is configured to receive the second end Pulse width modulation signal. The second power conversion stage is coupled to the first secondary side of the auxiliary transformer for providing the auxiliary main power. The first end of the switching element is coupled to the second power conversion stage to receive the auxiliary main power source, the second end of the switching element is coupled to the output end, and the control end of the switching element is configured to receive the enable signal.

於本發明的一實施例中，所述電源供應裝置更可以包括有偵測單元，其耦接所述輸出端與開關元件，用以偵測所述主電源，並於所述主電源低於所述預設值時產生所述致能訊號，藉以致使開關元件傳導所述輔助主電源至所述輸出端。In an embodiment of the present invention, the power supply device may further include a detecting unit coupled to the output end and the switching component for detecting the main power source, and the main power source is lower than The enable signal is generated when the preset value is generated, so that the switching element conducts the auxiliary main power source to the output end.

於本發明的一實施例中，偵測單元包括有比較器，其正輸入端用以接收所述預設值，其負輸入端耦接所述輸出端，而其輸出端則用以輸出所述致能訊號。In an embodiment of the invention, the detecting unit includes a comparator, the positive input end is configured to receive the preset value, and the negative input end is coupled to the output The output terminal is used to output the enable signal.

於本發明的一實施例中，第二電源轉換級可以包括有第二二極體與第三電容。其中，第二二極體的陽極耦接輔助變壓器之第一二次側的第一端，而第二二極體的陰極則用以輸出所述輔助主電源。第三電容的第一端耦接第二二極體的陰極，而第三電容的第二端則耦接至接地電位。In an embodiment of the invention, the second power conversion stage may include a second diode and a third capacitor. The anode of the second diode is coupled to the first end of the first secondary side of the auxiliary transformer, and the cathode of the second diode is configured to output the auxiliary main power source. The first end of the third capacitor is coupled to the cathode of the second diode, and the second end of the third capacitor is coupled to the ground potential.

於本發明的一實施例中，輔助變壓器更具有第二二次側，且輔助電源模組更可以包括有待機電源模組，其耦接輔助變壓器的第二二次側，用以提供待機電源給電腦系統。In an embodiment of the invention, the auxiliary transformer further has a second secondary side, and the auxiliary power module further includes a standby power module coupled to the second secondary side of the auxiliary transformer for providing standby power. Give the computer system.

於本發明的一實施例中，待機電源模組可以由降壓轉換器所組成，而第一與第二功率開關以及開關元件分別為N型電晶體。In an embodiment of the invention, the standby power module may be composed of a buck converter, and the first and second power switches and the switching elements are respectively N-type transistors.

於本發明的一實施例中，所述電腦系統可以為桌上型電腦系統。In an embodiment of the invention, the computer system can be a desktop computer system.

基於上述，本發明主要是透過輔助電源模組與偵測單元的協同，以在電源供應裝置所接收之市電發生斷電或跳電時提供桌上型電腦系統所需的直流電源(亦即輔助主電源)於一段保持時間(hold up time)。如此一來，即可致使桌上型電腦系統有充分的時間以進行正常關機流程，從而得以避免桌上型電腦系統發生異常或者無法恢復的損毀。Based on the above, the present invention mainly provides the DC power required by the desktop computer system (ie, auxiliary) when the power supply device receives power failure or power failure through the cooperation of the auxiliary power module and the detecting unit. The main power supply is held for a period of time. This will allow the desktop system to have sufficient time for the normal shutdown process to avoid abnormal or unrecoverable damage to the desktop system.

應瞭解的是，上述一般描述及以下具體實施方式僅為例示性及闡釋性的，其並不能限制本發明所欲主張之範圍。It is to be understood that the foregoing general description and claims

現將詳細參考本發明之實施例，並在附圖中說明所述實施例之實例。另外，凡可能之處，在圖式及實施方式中使用相同標號的元件/構件代表相同或類似部分。Reference will now be made in detail be made to the embodiments of the invention In addition, wherever possible, the same reference numerals in the drawings

圖1繪示為本發明一實施例之電源供應裝置(power supply device)10的示意圖，而圖2繪示為圖1之電源供應裝置10的電路示意圖。請合併參照圖1與圖2，本實施例之電源供應裝置10可以適用於桌上型電腦系統(desktop system)111，且其包括有第一電源轉換級(power conversion stage)101、單級降壓式模組(one stage buck module)103、升壓線路(boost circuit)105、輔助電源模組(auxiliary power module)107，以及偵測單元(detection unit)109。1 is a schematic diagram of a power supply device 10 according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of the power supply device 10 of FIG. Referring to FIG. 1 and FIG. 2 together, the power supply device 10 of the present embodiment can be applied to a desktop system 111, and includes a first power conversion stage 101 and a single-stage drop. A one-stage buck module 103, a boost circuit 105, an auxiliary power module 107, and a detection unit 109.

於本實施例中，第一電源轉換級101用以接收交流電壓(AC voltage)V_AC (例如市電)，並對交流電壓V_AC 進行整流(rectification)與濾波(filter)後而提供第一直流電壓(DC voltage)V_DC1 。更清楚來說，第一電源轉換級101可以包括有全橋整流器(full bridge rectifier)FBR與電容(capacitor)C1。其中，全橋整流器FBR用以接收交流電壓V_AC ，並對交流電壓V_AC 進行全波整流後而輸出第一直流電壓V_DC1 ；另外，電容C1耦接全橋整流器FBR，用以對全橋整流器FBR所輸出的第一直流電壓V_DC1 進行濾波，藉以降低第一直流電壓V_DC1 的漣波因素(ripple factor)。In this embodiment, the first power conversion stage 101 is configured to receive an AC voltage V _AC (eg, mains), and perform rectification and filtering on the AC voltage V _AC to provide a first DC. DC voltage V _DC1 . More specifically, the first power conversion stage 101 can include a full bridge rectifier FBR and a capacitor C1. The full-bridge rectifier FBR is configured to receive the AC voltage V _AC and perform full-wave rectification of the AC voltage V _AC to output the first DC voltage V _DC1 ; in addition, the capacitor C1 is coupled to the full-bridge rectifier FBR for the full bridge The first DC voltage V _DC1 outputted by the rectifier FBR is filtered to reduce the ripple factor of the first DC voltage V _DC1 .

單級降壓式模組103耦接於第一電源轉換級101與輸出端(output terminal)OUT之間，用以反應於第一脈寬調變(pulse width modulation,PWM)訊號V_PW1 而對第一電源轉換級101所提供的第一直流電壓V_DC1 進行直接降壓，藉以再透過輸出端OUT提供主電源(main power，例如12V)V_MP 給桌上型電腦系統111使用。另外，升壓線路105耦接單級降壓式模組103，用以反應於所接收的第一脈寬調變訊號V_PM1 而透過單級降壓式模組105以對第一電源轉換級101所提供的第一直流電壓V_DC1 進行升壓，從而提供第二直流電壓V_DC2 。The single-stage buck module 103 is coupled between the first power conversion stage 101 and the output terminal OUT for reacting to the first pulse width modulation (PWM) signal V _PW1 . The first DC voltage V _DC1 provided by the first power conversion stage 101 is directly stepped down, and then the main power (for example, 12V) V _{MP is} supplied to the desktop system 111 through the output terminal OUT. In addition, the boosting line 105 is coupled to the single-stage buck module 103 for transmitting the first pulse width modulation signal V _PM1 through the single-stage buck module 105 to the first power conversion stage. The first DC voltage V _DC1 provided by 101 is boosted to provide a second DC voltage V _DC2 .

更清楚來說，單級降壓式模組103可以包括有主變壓器(main transformer)MT與返馳式降壓轉換器(flyback buck converter)103_1。其中，主變壓器MT具有一次側(primary side)P1與二次側(secondary side)S1，且主變壓器MT之一次側P1的第一端用以接收第一電源轉換級101所提供的第一直流電壓V_DC1 ；而返馳式降壓轉換器103_1則耦接於主變壓器MT的二次側S1與輸出端OUT之間，用以透過輸出端OUT而提供主電源V_MP 給桌上型電腦系統111使用。More specifically, the single stage buck module 103 can include a main transformer MT and a flyback buck converter 103_1. The primary transformer MT has a primary side P1 and a secondary side S1, and the first end of the primary side P1 of the main transformer MT is configured to receive the first direct current provided by the first power conversion stage 101. The voltage V _DC1 is coupled to the secondary side S1 of the main transformer MT and the output terminal OUT for providing the main power supply V _MP to the desktop computer system through the output terminal OUT. 111 use.

另一方面，升壓線路105可以包括有功率開關(power switch)Q1(例如為N型電晶體)、二極體(diode)D1、熱敏電阻(thermal resistor)RT，以及具有相對大容量的電容C2。其中，功率開關Q1的第一端耦接主變壓器MT之一次側P1的第二端，功率開關Q1的第二端耦接至接地電位(ground)GND，而功率開關Q1的控制端則用以接收第一脈寬調變(PWM)訊號V_PW1 。二極體D1的陽極(anode)耦接功率開關Q1的第一端。熱敏電阻RT的第一端耦接二極體D1的陰極(cathode)，而熱敏電阻RT的第二端則用以輸出第二直流電壓V_DC2 。電容C2的第一端耦接熱敏電阻RT的第二端，而電容C2的第二端則耦接至接地電位GND。On the other hand, the boosting line 105 may include a power switch Q1 (for example, an N-type transistor), a diode D1, a thermal resistor RT, and a relatively large capacity. Capacitor C2. The first end of the power switch Q1 is coupled to the second end of the primary side P1 of the main transformer MT, the second end of the power switch Q1 is coupled to the ground GND, and the control end of the power switch Q1 is used. Receiving a first pulse width modulation (PWM) signal V _PW1 . The anode of the diode D1 is coupled to the first end of the power switch Q1. The first end of the thermistor RT is coupled to the cathode of the diode D1, and the second end of the thermistor RT is used to output the second DC voltage V _DC2 . The first end of the capacitor C2 is coupled to the second end of the thermistor RT, and the second end of the capacitor C2 is coupled to the ground potential GND.

於本實施例中，主變壓器MT之一次側P1所接收的第一直流電壓V_DC1 會反應於功率開關Q1的切換(基於第一脈寬調變訊號V_PW1 的緣故)，而在主變壓器MT之二次側S1以及節點N1上產生交流電壓。如此一來，返馳式降壓轉換器103_1便會對主變壓器MT之二次側S1上的交流電壓進行轉換(亦即交直流轉換與降壓)，藉以再透過輸出端OUT而提供主電源V_MP (亦即12V)給桌上型電腦系統111使用。與此同時，升壓線路105亦會對節點N1上的交流電壓進行轉換(亦即交直流轉換與升壓)，藉以提供第二直流電壓V_DC2 。In this embodiment, the first DC voltage V _DC1 received by the primary side P1 of the main transformer MT is reflected by the switching of the power switch Q1 (based on the first pulse width modulation signal V _PW1 ), and in the main transformer MT An alternating voltage is generated on the secondary side S1 and the node N1. In this way, the flyback buck converter 103_1 converts the AC voltage on the secondary side S1 of the main transformer MT (ie, AC/DC conversion and buck), thereby providing main power through the output terminal OUT. V _MP (i.e., 12V) is used by the desktop system 111. At the same time, the boost line 105 also converts the AC voltage on the node N1 (ie, AC/DC conversion and boost) to provide a second DC voltage V _DC2 .

在此值得一提的是，由於在電源供應裝置10的運作初期(initial operation)，由於具有相對大容量的電容C2尚未被充電，所以在全橋整流器FBR剛接收到交流電壓V_AC 的時候，很有可能會產生所謂的『突波電流(inrush current)』。一旦突波電流的能量(energy)過大就會造成過大的電磁干擾(electromagnetic interference,EMI)，從而使得電源供應裝置10不易符合安規的標準，或者有可能會損毀到電源供應裝置10的內部元件，甚至還有可能會危害到桌上型電腦系統111。有鑒於此，為能有效地抑制突波電流，本實施例特別在二極體D1與電容C2之間串上一個具有負溫度係數的熱敏電阻RT來抑制突波電流。如此一來，即可有效地抑制突波電流的產生。It is worth mentioning that, in the initial operation of the power supply device 10, since the capacitor C2 having a relatively large capacity has not been charged, when the full-bridge rectifier FBR has just received the AC voltage V _AC , It is very likely that there will be a so-called "inrush current". If the energy of the surge current is too large, excessive electromagnetic interference (EMI) may occur, so that the power supply device 10 is not easy to comply with the safety standards, or may damage the internal components of the power supply device 10. There may even be a compromise to the desktop system 111. In view of this, in order to effectively suppress the surge current, in this embodiment, a thermistor RT having a negative temperature coefficient is serially connected between the diode D1 and the capacitor C2 to suppress the surge current. In this way, the generation of surge current can be effectively suppressed.

於此，請再次返回參照圖1與圖2，輔助電源模組107耦接輸出端OUT與升壓線路105，用以反應於所接收的第二脈寬調變訊號V_PW2 而對升壓線路105所提供的第二直流電壓V_DC2 進行降壓，並且反應於偵測單元109所輸出的致能訊號(enabling signal)EN，而於單級降壓式模組103所提供的主電源V_MP 低於一預設值(即圖2中的“Vref”)時，提供輔助主電源(auxiliary main power)V_AMP 至輸出端OUT。Here, please refer back to FIG. 1 and FIG. 2 again, the auxiliary power module 107 is coupled to the output terminal OUT and the boosting line 105 for reacting to the received second pulse width modulation signal V _PW2 to the boosting line. The second DC voltage V _{DC2 provided} by the step 105 is _stepped down and reacted to the enabling signal EN output by the detecting unit 109, and the main power source V _MP provided by the single-stage buck module 103 is provided. Below a predetermined value (ie, "Vref" in Fig. 2), an auxiliary main power V _{AMP is} supplied to the output terminal OUT.

更清楚來說，輔助電源模組107可以包括有輔助變壓器(auxiliary transformer)AT、功率開關Q2(例如為N型電晶體)、第二電源轉換級107_1、開關元件(switch element)SW(例如為N型電晶體)，以及待機電源模組(standby power module)107_2。其中，輔助變壓器AT具有一次側P2以及二次側S2與S3。輔助變壓器AT之一次側P2的第一端用以接收升壓線路105所提供的第二直流電壓V_DC2 。功率開關Q2的第一端耦接輔助變壓器AT之一次側P2的第二端，功率開關Q2的第二端耦接至接地電位GND，而功率開關Q2的控制端則用以接收第二脈寬調變訊號V_PW2 。More specifically, the auxiliary power module 107 may include an auxiliary transformer AT, a power switch Q2 (for example, an N-type transistor), a second power conversion stage 107_1, and a switch element SW (for example, N-type transistor), and standby power module 107_2. Among them, the auxiliary transformer AT has a primary side P2 and secondary sides S2 and S3. The first end of the primary side P2 of the auxiliary transformer AT is for receiving the second DC voltage V _DC2 provided by the boosting line 105. The first end of the power switch Q2 is coupled to the second end of the primary side P2 of the auxiliary transformer AT, the second end of the power switch Q2 is coupled to the ground potential GND, and the control end of the power switch Q2 is configured to receive the second pulse width Modulation signal V _PW2 .

第二電源轉換級107_1耦接輔助變壓器AT的二次側 S2，用以提供輔助主電源V_AMP (例如為12V)。開關元件SW的第一端耦接第二電源轉換級107_1以接收輔助主電源V_AMP ，開關元件SW的第二端耦接輸出端OUT，而開關元件SW的控制端則用以接收偵測單元109所產生的致能訊號EN。待機電源模組107_2耦接輔助變壓器AT的二次側S3，用以提供待機電源(standby power)V_STB (例如5V)給桌上型電腦系統111使用。The second power conversion stage 107_1 is coupled to the secondary side S2 of the auxiliary transformer AT for providing an auxiliary main power source V _AMP (for example, 12V). The first end of the switching element SW is coupled to the second power conversion stage 107_1 to receive the auxiliary main power V _AMP , the second end of the switching element SW is coupled to the output end OUT, and the control end of the switching element SW is used to receive the detection unit The enabling signal EN produced by 109. The standby power module 107_2 is coupled to the secondary side S3 of the auxiliary transformer AT for providing standby power V _STB (for example, 5 V) for use by the desktop system 111.

於本實施例中，第二電源轉換級107_1可以包括有二極體D2與電容C3。其中，二極體D2的陽極耦接輔助變壓器AT之二次側S2的第一端，而二極體D2的陰極則用以輸出輔助主電源V_AMP 。另外，電容C3的第一端耦接二極體D2的陰極，而電容C3的第二端則耦接至接地電位GND。再者，待機電源模組1072可以由任一類型的降壓轉換器(buck converter)所組成，例如：返馳式(flyback)、順向式(forward)…等的降壓轉換器，但並不限制於此。In this embodiment, the second power conversion stage 107_1 may include a diode D2 and a capacitor C3. The anode of the diode D2 is coupled to the first end of the secondary side S2 of the auxiliary transformer AT, and the cathode of the diode D2 is used for outputting the auxiliary main power source V _AMP . In addition, the first end of the capacitor C3 is coupled to the cathode of the diode D2, and the second end of the capacitor C3 is coupled to the ground potential GND. Furthermore, the standby power module 1072 can be composed of any type of buck converter, such as a flyback, a forward, etc., but Not limited to this.

相似地，輔助變壓器AT之一次側P2接收的第二直流電壓V_DC2 會反應於功率開關Q2的切換(基於第二脈寬調變訊號V_PW2 的緣故)，而在輔助變壓器AT之二次側S2與S3上產生交流電壓。如此一來，第二電源轉換級107_1便會對輔助變壓器AT之二次側S2上的交流電壓進行轉換(亦即交直流轉換與降壓)，藉以提供輔助主電源V_AMP (同樣為12V)。與此同時，待機電源模組107_2亦會對輔助變壓器AT之二次側S3上的交流電壓進行轉換(亦即交直流轉換與降壓)，藉以提供待機電源V_STB 給桌上型電腦系統111使用。Similarly, the second DC voltage V _DC2 received by the primary side P2 of the auxiliary transformer AT is reflected by the switching of the power switch Q2 (based on the second pulse width modulation signal V _PW2 ), and on the secondary side of the auxiliary transformer AT An alternating voltage is generated across S2 and S3. In this way, the second power conversion stage 107_1 converts the AC voltage on the secondary side S2 of the auxiliary transformer AT (ie, AC/DC conversion and step-down), thereby providing the auxiliary main power source V _AMP (also 12V). . At the same time, the standby power module 107_2 also converts the AC voltage on the secondary side S3 of the auxiliary transformer AT (ie, AC/DC conversion and step-down), thereby providing the standby power V _STB to the desktop computer system 111. use.

除此之外，偵測單元109耦接輸出端OUT與開關元件SW，用以偵測單級降壓式模組103所提供的主電源V_MP ，並於單級降壓式模組103所提供的主電源V_MP 低於預設值Verf(例如11V，但並不限制於此)時產生致能訊號EN，藉以致使開關元件SW傳導第二電源轉換級107_1所提供的輔助主電源V_AMP (亦即12V)至輸出端OUT。更清楚來說，偵測單元可以包括有比較器(comparator)CP。其中，比較器CP的正輸入端(+)用以接收預設值Verf，比較器CP的負輸入端(-)耦接輸出端OUT，而比較器CP的輸出端則用以輸出致能訊號EN。In addition, the detecting unit 109 is coupled to the output terminal OUT and the switching element SW for detecting the main power supply V _MP provided by the single-stage buck module 103, and is provided by the single-stage buck module 103. When the main power supply V _{MP is} lower than the preset value Verf (for example, 11V, but is not limited thereto), the enable signal EN is generated, so that the switching element SW conducts the auxiliary main power supply V _AMP provided by the second power conversion stage 107_1. (ie 12V) to the output OUT. More specifically, the detecting unit may include a comparator CP. The positive input terminal (+) of the comparator CP is used to receive the preset value Verf, the negative input terminal (-) of the comparator CP is coupled to the output terminal OUT, and the output terminal of the comparator CP is used to output the enable signal. EN.

基於上述，在桌上型電腦系統111處於運作且交流電壓V_AC 相對穩定(亦即市電供應良好)的狀況下，電源供應裝置10會各別透過單級降壓式模組103與輔助電源模組107以持續供應主電源V_MP 與待機電源V_STB 給桌上型電腦系統111使用。此時，由於比較器CP之正輸入端(+)的電位(亦即預設值Verf，11V)低於其負輸入端(-)的電位(亦即輸出端OUT上的電壓，12V)，所以偵測單元109並不會輸出致能訊號EN，從而使得開關元件SW保持關閉(turn off)的狀態。Based on the above, in the case where the desktop computer system 111 is in operation and the AC voltage V _{AC is} relatively stable (that is, the commercial power supply is good), the power supply device 10 will separately pass through the single-stage buck module 103 and the auxiliary power mode. The group 107 is used by the desktop system 111 to continuously supply the main power source V _MP and the standby power source V _STB . At this time, since the potential of the positive input terminal (+) of the comparator CP (that is, the preset value Verf, 11V) is lower than the potential of the negative input terminal (-) (that is, the voltage at the output terminal OUT, 12V), Therefore, the detecting unit 109 does not output the enable signal EN, so that the switching element SW maintains a state of being turned off.

另一方面，一旦交流電壓V_AC 發生異常時(例如市電斷電或跳電)，單級降壓式模組103會立即停止供應主電源V_MP 給桌上型電腦系統111。於此同時，基於相對大容量之電容C2的緣故，輔助電源模組107還是會持續供應輔助主電源V_AMP 與待機電源V_STB 於一段時間(其長短需視電容C2的容量而論)。再加上，比較器CP之正輸入端(+)的電位(亦即預設值Verf，11V)會高於其負輸入端(-)的電位(亦即輸出端OUT上的電壓，0V)，所以偵測單元109就會輸出致能訊號EN，從而使得開關元件SW處於導通(turn on)的狀態。On the other hand, when an abnormality occurs in the AC voltage V _AC (for example, a mains power failure or a power jump), the single-stage buck module 103 immediately stops supplying the main power source V _MP to the desktop computer system 111. At the same time, based on the relatively large capacity capacitor C2, the auxiliary power supply module 107 will continue to supply the auxiliary main power source V _AMP and the standby power source V _STB for a period of time (the length of which depends on the capacity of the capacitor C2). In addition, the potential of the positive input terminal (+) of the comparator CP (that is, the preset value Verf, 11V) is higher than the potential of the negative input terminal (-) (that is, the voltage at the output terminal OUT, 0V). Therefore, the detecting unit 109 outputs the enable signal EN, so that the switching element SW is in a turn-on state.

如此一來，開關元件SW便會傳導輔助電源模組107所供應的輔助主電源V_AMP 至輸出端OUT，藉以提供給桌上型電腦系統111使用。由此可知，雖然單級降壓式模組103在交流電壓V_AC 發生異常時就立即停止供應主電源V_MP ，但基於輔助電源模組107的緣故，本實施例之電源供應裝置10仍可在交流電壓V_AC 消失後供應在規定範圍內的輔助主電源V_AMP 於一段保持時間(hold up time，例如16ms，但並不限制於此)給桌上型電腦系統111使用。In this way, the switching element SW conducts the auxiliary main power source V _AMP supplied from the auxiliary power source module 107 to the output terminal OUT for use by the desktop computer system 111. Therefore, although the single-stage buck module 103 stops supplying the main power source V _MP immediately when the AC voltage V _AC is abnormal, the power supply device 10 of the embodiment can still be used based on the auxiliary power module 107. The auxiliary main power source V _AMP supplied within the prescribed range after the disappearance of the AC voltage V _AC is used by the desktop computer system 111 for a hold time (for example, 16 ms, but is not limited thereto).

換言之，本發明主要是透過輔助電源模組107與偵測單元107的協同，以在電源供應裝置10所接收之市電(亦即交流電壓V_AC )發生斷電或跳電時提供桌上型電腦系統111所需的直流電源(亦即輔助主電源V_AMP )於一段保持時間。如此一來，一旦桌上型電腦系統111得知單級降壓式模組103所提供的主電源V_MP 喪失(其可依據偵測單元109是否有輸出致能訊號EN即可得知)，就會馬上利用輔助電源模組107於保持時間所提供的輔助主電源V_AMP 以進行正常的關機流程，從而得以避免桌上型電腦系統111發生異常或者無法恢復的損毀。In other words, the present invention mainly provides a desktop computer through the cooperation of the auxiliary power module 107 and the detecting unit 107 to generate a power failure or a power failure when the power supply (ie, the AC voltage V _AC ) received by the power supply device 10 is powered off or jumped. The DC power required by system 111 (i.e., the auxiliary main power supply V _AMP ) is maintained for a period of time. In this way, once the desktop computer system 111 knows that the main power supply V _MP provided by the single-stage buck module 103 is lost (it can be known according to whether the detection unit 109 has an output enable signal EN), The auxiliary main power supply V _AMP provided by the auxiliary power supply module 107 at the hold time is immediately used for the normal shutdown process, thereby avoiding the abnormality or unrecoverable damage of the desktop computer system 111.

雖然本發明已以實施例揭露如上，然其並非用以限定本發明，任何所屬技術領域中具有通常知識者，在不脫離本發明之精神和範圍內，當可作些許之更動與潤飾，故本發明之保護範圍當視後附之申請專利範圍所界定者為準。另外，本發明的任一實施例或申請專利範圍不須達成本發明所揭露之全部目的或優點或特點。此外，摘要部分和標題僅是用來輔助專利文件搜尋之用，並非用來限制本發明之權利範圍。Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention.

10‧‧‧電源供應裝置10‧‧‧Power supply unit

101‧‧‧第一電源轉換級101‧‧‧First power conversion stage

103‧‧‧單級降壓式模組103‧‧‧Single-stage buck module

103_1‧‧‧返馳式降壓轉換器103_1‧‧‧Return-to-step buck converter

105‧‧‧升壓線路105‧‧‧Boost line

107‧‧‧輔助電源模組107‧‧‧Auxiliary power module

107_1‧‧‧第二電源轉換級107_1‧‧‧Second power conversion stage

107_2‧‧‧待機電源模組107_2‧‧‧Standby power module

109‧‧‧偵測單元109‧‧‧Detection unit

111‧‧‧電腦系統111‧‧‧ computer system

OUT‧‧‧輸出端OUT‧‧‧ output

FBR‧‧‧全橋整流器FBR‧‧‧ Full Bridge Rectifier

C1~C3‧‧‧電容C1~C3‧‧‧ capacitor

D1、D2‧‧‧二極體D1, D2‧‧‧ diode

CP‧‧‧比較器CP‧‧‧ comparator

SW‧‧‧開關元件SW‧‧‧Switching elements

MT‧‧‧主變壓器MT‧‧‧ main transformer

AT‧‧‧輔助變壓器AT‧‧‧Auxiliary transformer

RT‧‧‧熱敏電阻RT‧‧‧Thermistor

Q1、Q2‧‧‧功率開關Q1, Q2‧‧‧ power switch

P1、P2‧‧‧一次側P1, P2‧‧‧ primary side

S1~S3‧‧‧二次側S1~S3‧‧‧ secondary side

V_AC ‧‧‧交流電壓V _AC ‧‧‧AC voltage

V_DC1 ‧‧‧第一直流電壓V _DC1 ‧‧‧First DC voltage

V_DC2 ‧‧‧第二直流電壓V _DC2 ‧‧‧second DC voltage

V_PW1 ‧‧‧第一脈寬調變訊號V _PW1 ‧‧‧First pulse width modulation signal

V_PW2 ‧‧‧第二脈寬調變訊號V _PW2 ‧‧‧Second pulse width modulation signal

EN‧‧‧致能訊號EN‧‧‧Enable signal

V_MP ‧‧‧主電源V _MP ‧‧‧main power supply

V_AMP ‧‧‧輔助主電源V _AMP ‧‧‧Auxiliary main power supply

V_STB ‧‧‧待機電源V _STB ‧‧‧Standby power supply

Vref‧‧‧預設值Vref‧‧‧ default value

GND‧‧‧接地電位GND‧‧‧ Ground potential

下面的所附圖式是本發明的說明書的一部分，繪示了本發明的示例實施例，所附圖式與說明書的描述一起說明本發明的原理。The following drawings are a part of the specification of the invention, and illustrate the embodiments of the invention

圖1繪示為本發明一實施例之電源供應裝置10的示意圖。FIG. 1 is a schematic diagram of a power supply device 10 according to an embodiment of the invention.

圖2繪示為圖1之電源供應裝置10的電路示意圖。2 is a circuit diagram of the power supply device 10 of FIG. 1.

10‧‧‧電源供應裝置10‧‧‧Power supply unit

101‧‧‧第一電源轉換級101‧‧‧First power conversion stage

103‧‧‧單級降壓式模組103‧‧‧Single-stage buck module

105‧‧‧升壓線路105‧‧‧Boost line

107‧‧‧輔助電源模組107‧‧‧Auxiliary power module

107_1‧‧‧第二電源轉換級107_1‧‧‧Second power conversion stage

107_2‧‧‧待機電源模組107_2‧‧‧Standby power module

109‧‧‧偵測單元109‧‧‧Detection unit

111‧‧‧電腦系統111‧‧‧ computer system

OUT‧‧‧輸出端OUT‧‧‧ output

FBR‧‧‧全橋整流器FBR‧‧‧ Full Bridge Rectifier

C1~C3‧‧‧電容C1~C3‧‧‧ capacitor

D1、D2‧‧‧二極體D1, D2‧‧‧ diode

CP‧‧‧比較器CP‧‧‧ comparator

SW‧‧‧開關元件SW‧‧‧Switching elements

MT‧‧‧主變壓器MT‧‧‧ main transformer

AT‧‧‧輔助變壓器AT‧‧‧Auxiliary transformer

RT‧‧‧熱敏電阻RT‧‧‧Thermistor

Q1、Q2‧‧‧功率開關Q1, Q2‧‧‧ power switch

P1、P2‧‧‧一次側P1, P2‧‧‧ primary side

S1~S3‧‧‧二次側S1~S3‧‧‧ secondary side

V_AC ‧‧‧交流電壓V _AC ‧‧‧AC voltage

V_DC1 ‧‧‧第一直流電壓V _DC1 ‧‧‧First DC voltage

V_DC2 ‧‧‧第二直流電壓V _DC2 ‧‧‧second DC voltage

EN‧‧‧致能訊號EN‧‧‧Enable signal

V_MP ‧‧‧主電源V _MP ‧‧‧main power supply

V_AMP ‧‧‧輔助主電源V _AMP ‧‧‧Auxiliary main power supply

V_STB ‧‧‧待機電源V _STB ‧‧‧Standby power supply

Vref‧‧‧預設值Vref‧‧‧ default value

GND‧‧‧接地電位GND‧‧‧ Ground potential

Claims

一種電源供應裝置，包括：一第一電源轉換級，用以接收一交流電壓，並對該交流電壓進行整流與濾波後而提供一第一直流電壓；一單級降壓式模組，耦接於該第一電源轉換級與一輸出端之間，用以反應於一第一脈寬調變訊號而對該第一直流電壓進行直接降壓，藉以透過該輸出端提供一主電源給一電腦系統；一升壓線路，耦接該單級降壓式模組，用以反應於該第一脈寬調變訊號而透過該單級降壓式模組以對該第一直流電壓進行升壓，從而提供一第二直流電壓；以及一輔助電源模組，耦接該輸出端與該升壓線路，用以反應於一第二脈寬調變訊號而對該第二直流電壓進行降壓，並且反應於一致能訊號而於該主電源低於一預設值時提供一輔助主電源至該輸出端。A power supply device includes: a first power conversion stage for receiving an AC voltage, and rectifying and filtering the AC voltage to provide a first DC voltage; a single-stage buck module coupled Between the first power conversion stage and an output terminal, the first DC voltage is directly stepped down in response to a first pulse width modulation signal, so that a main power source is provided to the computer through the output terminal. a stepping circuit coupled to the single-stage buck module for reacting the first pulse width modulation signal to boost the first DC voltage through the single-stage buck module Providing a second DC voltage; and an auxiliary power module coupled to the output terminal and the boosting circuit for bucking the second DC voltage in response to a second pulse width modulation signal, And reacting to the uniform energy signal to provide an auxiliary main power to the output when the main power source is lower than a preset value.

如申請專利範圍第1項所述之電源供應裝置，其中該第一電源轉換級包括：一全橋整流器，用以接收該交流電壓，並對該交流電壓進行全波整流後而輸出該第一直流電壓；以及一第一電容，耦接該全橋整流器，用以對該全橋整流器所輸出的第一直流電壓進行濾波。The power supply device of claim 1, wherein the first power conversion stage comprises: a full bridge rectifier for receiving the alternating voltage, and full-wave rectifying the alternating voltage to output the first a DC voltage; and a first capacitor coupled to the full bridge rectifier for filtering the first DC voltage output by the full bridge rectifier.

如申請專利範圍第2項所述之電源供應裝置，其中該單級降壓式模組包括：一主變壓器，具有一一次側與一二次側，其中該主變壓器之該一次側的第一端用以接收該第一直流電壓；以及一返馳式降壓轉換器，耦接於該主變壓器的該二次側與該輸出端之間，用以透過該輸出端而提供該主電源給該電腦系統。The power supply device of claim 2, wherein The single-stage buck module includes: a main transformer having a primary side and a secondary side, wherein the first end of the primary side of the main transformer is configured to receive the first DC voltage; and a flyback The buck converter is coupled between the secondary side of the main transformer and the output terminal for providing the main power to the computer system through the output terminal.

如申請專利範圍第3項所述之電源供應裝置，其中該升壓線路包括：一第一功率開關，其第一端耦接該主變壓器之該一次側的第二端，其第二端耦接至一接地電位，而其控制端則用以接收該第一脈寬調變訊號；一第一二極體，其陽極耦接該第一功率開關的第一端；一熱敏電阻，其第一端耦接該第一二極體的陰極，而其第二端則用以輸出該第二直流電壓；以及一第二電容，其第一端耦接該熱敏電阻的第二端，而其第二端則耦接至該接地電位。The power supply device of claim 3, wherein the boosting circuit comprises: a first power switch, the first end of which is coupled to the second end of the primary side of the main transformer, and the second end is coupled Connected to a ground potential, and the control terminal is configured to receive the first pulse width modulation signal; a first diode having an anode coupled to the first end of the first power switch; a thermistor The first end is coupled to the cathode of the first diode, and the second end is configured to output the second DC voltage; and a second capacitor is coupled to the second end of the thermistor. The second end is coupled to the ground potential.

如申請專利範圍第4項所述之電源供應裝置，其中該輔助電源模組包括：一輔助變壓器，具有一一次側與一第一二次側，其中該輔助變壓器之該一次側的第一端用以接收該第二直流電壓；一第二功率開關，其第一端耦接該輔助變壓器之該一次側的第二端，其第二端耦接至該接地電位，而其控制端則用以接收該第二脈寬調變訊號；一第二電源轉換級，耦接該輔助變壓器的該第一二次側，用以提供該輔助主電源；以及一開關元件，其第一端耦接該第二電源轉換級以接收該輔助主電源，其第二端耦接該輸出端，而其控制端則用以接收該致能訊號。The power supply device of claim 4, wherein the auxiliary power module comprises: an auxiliary transformer having a primary side and a first secondary side, wherein the primary side of the auxiliary transformer is first The terminal is configured to receive the second DC voltage; a second power switch having a first end coupled to the second end of the primary side of the auxiliary transformer, a second end coupled to the ground potential, and a control end configured to receive the second pulse width modulation a second power conversion stage coupled to the first secondary side of the auxiliary transformer for providing the auxiliary main power; and a switching element having a first end coupled to the second power conversion stage to receive the signal The auxiliary main power source has a second end coupled to the output end and a control end configured to receive the enable signal.

如申請專利範圍第5項所述之電源供應裝置，更包括：一偵測單元，耦接該輸出端與該開關元件，用以偵測該主電源，並於該主電源低於該預設值時產生該致能訊號，藉以致使該開關元件傳導該輔助主電源至該輸出端。The power supply device of claim 5, further comprising: a detecting unit coupled to the output end and the switching component for detecting the main power source, wherein the main power source is lower than the preset The enable signal is generated when the value causes the switching element to conduct the auxiliary main power supply to the output.

如申請專利範圍第6項所述之電源供應裝置，其中該偵測單元包括：一比較器，其正輸入端用以接收該預設值，其負輸入端耦接該輸出端，而其輸出端則用以輸出該致能訊號。The power supply device of claim 6, wherein the detecting unit comprises: a comparator having a positive input terminal for receiving the preset value, a negative input terminal coupled to the output terminal, and an output thereof The terminal is used to output the enable signal.

如申請專利範圍第5項所述之電源供應裝置，其中該第二電源轉換級包括：一第二二極體，其陽極耦接該輔助變壓器之該第一二次側的第一端，而其陰極則用以輸出該輔助主電源；以及一第三電容，其第一端耦接該第二二極體的陰極，而其第二端則耦接至該接地電位。The power supply device of claim 5, wherein the second power conversion stage comprises: a second diode having an anode coupled to the first end of the first secondary side of the auxiliary transformer, and The cathode is used to output the auxiliary main power source; A third capacitor has a first end coupled to the cathode of the second diode and a second end coupled to the ground potential.

如申請專利範圍第5項所述之電源供應裝置，其中該輔助變壓器更具有一第二二次側，且該輔助電源模組更包括：一待機電源模組，耦接該輔助變壓器的該第二二次側，用以提供一待機電源給該電腦系統。The power supply device of claim 5, wherein the auxiliary transformer further has a second secondary side, and the auxiliary power module further includes: a standby power module coupled to the auxiliary transformer The second secondary side is used to provide a standby power to the computer system.

如申請專利範圍第9項所述之電源供應裝置，其中該待機電源模組由一降壓轉換器所組成。The power supply device of claim 9, wherein the standby power module is composed of a buck converter.

如申請專利範圍第5項所述之電源供應裝置，其中該第一與該第二功率開關與該開關元件分別為一N型電晶體。The power supply device of claim 5, wherein the first and the second power switch and the switching element are respectively an N-type transistor.

如申請專利範圍第1項所述之電源供應裝置，其中該電腦系統為一桌上型電腦系統。The power supply device of claim 1, wherein the computer system is a desktop computer system.