CN102468771A - Power converter and undervoltage protection method thereof - Google Patents

Power converter and undervoltage protection method thereof Download PDF

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Publication number
CN102468771A
CN102468771A CN 201010540938 CN201010540938A CN102468771A CN 102468771 A CN102468771 A CN 102468771A CN 201010540938 CN201010540938 CN 201010540938 CN 201010540938 A CN201010540938 A CN 201010540938A CN 102468771 A CN102468771 A CN 102468771A
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signal
voltage
transistor
coupled
power
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CN 201010540938
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Chinese (zh)
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贾儒林
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力林科技股份有限公司
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Abstract

The invention provides a power converter and an undervoltage protection method thereof. The undervoltage protection method comprises the following steps of: sampling a rectified signal associated with alternating current voltage received by the power converter by using a discrete sampling means; and when the peak of the sampled rectified signal reaches a preset value in a preset period, making a pulse width modulation control chip in the power converter provide a pulse width modulation signal to switch a power switch in the power converter so as to ensure that the power converter provides output voltage to an electronic device, and when the peak of the sampled rectified signal does not reach the preset value in the preset period, making the pulse width modulation control chip stop providing the pulse width modulation signal.

Description

电源转换装置及其欠压保护方法 Voltage protection power conversion device and method

技术领域 FIELD

[0001] 本发明涉及一种电源转换装置及其欠压保护方法,尤其涉及一种具有能协助电源启动与欠压保护(brown-out protection)功能的电源转换装置。 [0001] The present invention relates to a power conversion device and undervoltage protection method, particularly to a power conversion device having a power source to help start the undervoltage (brown-out protection) function.

背景技术 Background technique

[0002] 电源转换装置(power conversion apparatus)主要的用途乃是将电力公司所提供的高压且低稳定性的交流电压(AC voltage)转换成适合各种电子装置(electronic devices)所使用的低压且稳定性较佳的直流电压(DC voltage) 0因此,电源转换装置广泛地应用在电脑、办公室自动化设备、工业控制设备,以及通信设备等电子装置中。 [0002] The main purpose of the power conversion apparatus (power conversion apparatus) but the high voltage power company provides stability and low alternating voltage (AC voltage) is converted into a low pressure suitable for a variety of electronic devices (electronic devices) and used preferred stability direct voltage (DC voltage) 0 Thus, the power conversion devices are widely used in computers, electronic devices for office automation equipment, industrial control equipment, communications equipment and the like.

[0003] 现今电源转换装置中的控制架构(control structure)大多采用脉宽调制控制芯片(PWM control chip)。 [0003] Nowadays control architecture (control structure) power conversion device using pulse width modulation control chip often (PWM control chip). 实际上,脉宽调制控制芯片很有可能会在电源转换装置所接收的交流电压尚未稳定时(例如欠压(brown-out),可理解为关联于所接收的交流电压的整流信号的峰值尚未达到电子装置的系统所需的最低电压)就提供脉宽调制信号以切换(即导通或关闭)电源转换装置中的功率开关(power switch)。 Indeed, pulse-width modulation control chip is likely to be when the AC voltage received power conversion device has stabilized (e.g. undervoltage (brown-out), understood as being associated to the peak of the received signal rectified AC voltage has not been the electronic device to achieve a desired minimum system voltage) to provide a pulse width modulated signal to the switching power converter means (i.e. open or closed) of the power switch (power switch). 如此一来,在功率恒定的条件下, 很有可能会造成电源转换装置及/或电子装置的内部元件无法恢复的损毁。 Thus, at a constant power conditions, it is likely to cause damage to the internal components of the power converter means and / or electronic devices can not be restored.

发明内容 SUMMARY

[0004] 有鉴于此,本发明提出一种具有能协助电源启动与欠压保护功能的电源转换装置,其得以在所接收的交流电压尚未稳定时(亦即欠压),协助启动脉宽调制控制芯片的电源,并且致使脉宽调制控制芯片停止提供脉宽调制信号。 [0004] Accordingly, the present invention provides a power supply to help start having the power conversion device under voltage protection function, which is received when the AC voltage is not yet stabilized (i.e. under voltage), pulse width modulation start assist control chip power supply, and causes the pulse-width modulation controller chip provides pulse width modulated signal.

[0005] 本发明提供一种电源转换装置,其包括有电源转换级、整流单元、变压器、第一功率开关,以及脉宽调制控制芯片。 [0005] The present invention provides a power converter apparatus, which comprises a power conversion stage, a rectifying unit, a transformer, a first power switch, and a pulse width modulation control chip. 其中,电源转换级用以接收一交流电压,并对所述交流电压进行转换后而提供一输入电压。 Wherein the power conversion stage for receiving an AC voltage and the converted AC voltage to provide a voltage input. 整流单元用以接收所述交流电压,并对所述交流电压进行整流后而提供一整流信号。 Rectifying means to receive the AC voltage and the AC voltage is rectified to provide a rectified signal. 变压器具有一次侧、第一二次侧与第二二次侧,且所述一次侧的第一端用以接收所述输入电压,所述第一二次侧用以提供一输出电压给电子装置,而所述第二二次侧则用以提供一系统电压。 A transformer having a primary side and a secondary side of the first and the second secondary side and the primary side of the first end for receiving the input voltage, the secondary side for providing a first output voltage to the electronic device and said second secondary-side system is configured to provide a voltage.

[0006] 第一功率开关的第一端耦接所述一次侧的第二端,第一功率开关的第二端耦接至一接地电位,而第一功率开关的控制端则用以接收一脉宽调制信号。 [0006] a first terminal coupled to the first power switch of the primary side of the second end, a second end coupled to the first power switch is coupled to a ground potential, and the control terminal of the first power switch is configured to receive a pulse width modulated signal. 脉宽调制控制芯片耦接整流单元、变压器以及第一功率开关,用以接收所述系统电压,并通过所述整流信号的协助而操作于所述系统电压下,而且更运用一离散取样手段以对所述整流信号进行取样,从而在所述整流信号的峰值于一预设期间内有达到一预设值时,提供所述脉宽调制信号来切换功率开关。 Control chip is coupled to the rectifier unit, a first power switch and a transformer, to receive the system voltage, by assisting the rectified signal to operate the system voltage pulse width modulation, but also to the use of a discrete sampling means of the rectified signal is sampled, thus within a predetermined period of peak of the rectified signal reaches a predetermined value, the pulse width modulated signal to provide a switching power switch.

[0007] 在本发明的一实施例中,脉宽调制控制芯片包括脉宽调制信号产生器与欠压保护单元。 [0007] In an embodiment of the present invention, the pulse width modulation control chip comprises a pulse width modulated signal generator and voltage protection unit. 其中,脉宽调制信号产生器耦接第一功率开关的控制端,用以反应于一欠压保护信号而提供所述脉宽调制信号。 Wherein the pulse width modulated signal generator is coupled to the control terminal of the first power switch for voltage protection in response to a signal and providing the pulse width modulated signal. 欠压保护单元耦接脉宽调制信号产生器,用以接收并提供所述整流信号以协助脉宽调制控制芯片操作于所述系统电压下,并且运用所述离散取样手段以对所述整流信号进行取样,从而在所述整流信号的峰值于所述预设期间内有达到所述预设值时,输出所述欠压保护信号。 Voltage protection unit is coupled to a pulse width modulation signal generator for receiving the rectified signal and providing a pulse width modulation control to assist in chip operating at the system voltage, and the use of the discrete sampled signal to said rectifying means sampling, so that the peak in the rectified signal with a preset time reaches the preset value, the output signal of the undervoltage protection period.

[0008] 在本发明的一实施例中,欠压保护单元包括第一电阻、开关、第二功率开关、第一至第六晶体管、参考电流源、比较器,以及数字信号处理器。 [0008] In an embodiment of the present invention, the voltage protection unit comprises a first resistor, a switch, a second power switch, the first to sixth transistors, the reference current source, a comparator, and a digital signal processor. 其中,第一电阻的第一端用以接收所述整流信号。 Wherein a first terminal of the first resistor to receive the rectified signal. 第二功率开关的第一端耦接第一电阻的第二端,而第二功率开关的控制端则用以接收一第一控制信号。 A first terminal of the second power switch coupled to the second terminal of the first resistor, and the control terminal of the second power switch is configured to receive a first control signal. 开关的第一端耦接第二功率开关的第二端,开关的第二端耦接所述系统电压,而开关的控制端则用以接收一切换信号。 A second terminal of the switch coupled to the second terminal of the first power switch, a second terminal of the switch coupled to the system voltage, and the control terminal of the switch is configured to receive a switching signal. 第一晶体管的栅极用以接收所述第一控制信号,而第一晶体管的漏极则耦接第二功率开关的第二端。 Gate of the first transistor receives said first control signal, and the drain of the first transistor is coupled to the second terminal of the second power switch.

[0009] 第二晶体管的栅极与漏极耦接第一晶体管的源极,而第二晶体管的源极则耦接至所述接地电位。 [0009] The gate and the drain of the second transistor is coupled to the source of the first transistor, and the source of the second transistor is coupled to the ground potential. 第三晶体管的栅极耦接第二晶体管的栅极,而第三晶体管的源极则耦接至所述接地电位。 Gate of the third transistor is coupled to the gate of the second transistor, and the source of the third transistor is coupled to the ground potential. 第四晶体管的源极耦接至一偏压,而第四晶体管的栅极与漏极则耦接至第三晶体管的漏极。 Source of the fourth transistor is coupled to a bias voltage, and the gate and the drain of the fourth transistor is coupled to the drain of the third transistor. 第五晶体管的栅极耦接第四晶体管的栅极,而第五晶体管的源极则耦接至所述偏压。 A gate coupled to the gate of the fifth transistor of the fourth transistor, and the source of the fifth transistor is coupled to the bias voltage. 参考电流源耦接于第五晶体管的漏极与所述接地电位之间。 A reference current source coupled between the drain of the fifth transistor and the ground potential. 第六晶体管的栅极用以接收与所述第一控制信号互为反相的一第二控制信号,第六晶体管的漏极耦接第五晶体管的漏极,而第六晶体管的源极则耦接至所述接地电位。 Gate of the sixth transistor receives a second control signal and the first control signal are out of phase, the drain coupled to the drain of the sixth transistor is a fifth transistor, and the source of the sixth transistor coupled to the ground potential.

[0010] 比较器的第一输入端耦接第五晶体管的漏极,比较器的第二输入端用以接收一参考电压,而比较器的输出端则用以输出一比较信号。 The drain [0010] a first input of the comparator is coupled to the fifth transistor, a second input of the comparator receives a reference voltage, and the output terminal of the comparator is configured to output a comparison signal. 数字信号处理器用以在电源转换装置的一初始期间,提供所述第一与第二控制信号以及所述切换信号,以致使所述整流信号协助脉宽调制控制芯片操作于所述系统电压下,且在电源转换装置的一运作期间,反应于一时脉信号而提供所述第一与第二控制信号,通过对所述整流信号进行离散取样,并据以记录关联于离散取样的比较信号,从而在所述整流信号的峰值于所述预设期间内有达到所述预设值时,输出所述欠压保护信号。 In a digital signal processor is configured during initial power conversion apparatus, and providing said first control signal and said second switching signal, to cause the pulse width modulated rectified signal to assist the control of the chip operating at a system voltage, and during operation of a power conversion apparatus, in response to a clock signal and providing the first and second control signal, the rectified signal through discrete sampled and recorded according to the comparison signal associated with the discrete sampling, whereby in the peak value of the rectified signal in the predetermined time has reached the preset value, the output signal of the undervoltage protection period.

[0011] 在本发明的一实施例中,所述预设期间包括所述整流信号的N个周期,N为正整数。 [0011] In an embodiment of the present invention, the predetermined period includes N cycles of the rectified signal, N is a positive integer. 在此条件下,数字信号处理器在电源转换装置的初始期间所提供的第一与第二控制信号会对所述整流信号的所述N个周期的每一周期进行M次取样,从而使得数字信号处理器在电源转换装置的初始期间会对所述整流信号进行N*M次取样,其中M小于N。 Under this condition, the digital signal processor during the initial power conversion apparatus is provided with a first sampling M times the period of each of the second control signal be rectified signal N cycles, so that the digital N * M signal processor sub-sampled signal is rectified in the initial period will power conversion apparatus, where M is less than N.

[0012] 在本发明的一实施例中,数字信号处理器对所述整流信号所进行的第i次取样时间Ti为第i-Ι次取样时间IV1加上一预设时间,i为奇数正整数;以及数字信号处理器对所述整流信号所进行的第i+Ι次取样时间Tw为第i次取样时间Ti加上所述预设时间与一偏移时间ΔΤ。 [0012] In an embodiment of the present invention, the i-th sampling time of the digital signal processor of the rectified signal is performed by the i-Ti iota sampling times IV1 plus a predetermined time, n i is an odd number integer; i + Ι sampling times of the time Tw and a digital signal processor of the rectified signal is performed by the i-th sampling time and the preset time Ti plus an offset time ΔΤ.

[0013] 在本发明的一实施例中,第一与第二功率开关、第一至第三晶体管,以及第六晶体管分别为N型晶体管;而第四与第五晶体管分别为P型晶体管。 [0013] In an embodiment of the present invention, the first and second power switch, the first to third transistors, and a sixth transistor are N-type transistor; the fourth and the fifth transistor are P-type transistors.

[0014] 在本发明的一实施例中,第二晶体管的尺寸为第三晶体管的K倍,而第四与第五的尺寸相同,K为正整数。 [0014] In an embodiment of the present invention, the size of the second transistor is K times the third transistor, the fourth and fifth of the same size, K is a positive integer.

[0015] 在本发明的一实施例中,电源转换级包括全桥整流器与滤波电容。 [0015] In an embodiment of the present invention, the power conversion stage comprises a full bridge rectifier and filter capacitor. 其中,全桥整流器用以接收所述交流电压,并对所述交流电压进行全波整流后而输出。 Wherein the full bridge rectifier to receive the AC voltage and the AC voltage is full-wave rectified outputs. 滤波电容耦接全桥整流器,用以对全桥整流器的输出进行滤波,以提供所述输入电压。 Filter capacitor is coupled to a full bridge rectifier to filter the output of a full bridge rectifier to provide the input voltage.

[0016] 在本发明的一实施例中,整流单元包括第一二极管与第二二极管。 [0016] In an embodiment of the present invention, the rectifying unit includes a first diode and a second diode. 其中,第一与第二二极管的阳极用以接收所述交流电压,而第一与第二二极管的阴极则用以提供所述整流信号。 Wherein the first and second anode of the diode for receiving the AC voltage, while the cathode of the first diode and the second is to provide the rectified signal.

[0017] 在本发明的一实施例中,所提的电源转换装置更包括感测电阻,耦接于第一功率开关的第二端与所述接地电位之间。 The power conversion apparatus [0017] In an embodiment of the present invention, the mentioned further comprises a sensing resistor coupled between the second end and the ground potential of the first power switch. 在此条件下,脉宽调制控制芯片更包括过电流保护单元,耦接至第一功率开关与感测电阻之间的一节点,用以接收并比较所述节点的电压与一预设过电流保护参考电压,以决定是否启动一过电流保护机制来控制脉宽调制信号产生器是否产生所述脉宽调制信号。 Under this condition, a pulse width modulation control chip further includes an overcurrent protection unit, coupled to a node between the first power switch and the sensing resistor, for receiving and comparing the voltage to a predetermined node overcurrent protection reference voltage to decide whether to activate an over current protection mechanisms to control whether the pulse width modulation signal generator generates the pulse width modulation signal.

[0018] 在本发明的一实施例中,所提的电源转换装置更包括反馈单元,用以接收所述输出电压,并据以输出关联于电子装置的负载状态的一反馈信号。 [0018] In an embodiment of the present invention, the power conversion apparatus further includes a feedback mentioned means for receiving said output voltage, and outputting a feedback signal related to the load state of the electronic device. 在此条件下,脉宽调制控制芯片更用以根据所述反馈信号来调整所述脉宽调制信号。 Under this condition, a pulse width modulation control chip is further configured to adjust the pulse width modulation signal according to the feedback signal.

[0019] 本发明提供一种适于电源转换装置的欠压保护方法,其包括:运用离散取样手段以对关联于电源转换装置所接收的交流电压的整流信号进行取样;以及当被取样的整流信号的峰值于一预设期间内有达到一预设值时,则致使电源转换装置内的脉宽调制控制芯片提供脉宽调制信号以切换电源转换装置内的功率开关,从而使得电源转换装置提供输出电压给电子装置;否则,致使脉宽调制控制芯片停止提供脉宽调制信号。 [0019] The present invention provides a method suitable voltage protection power conversion apparatus, comprising: using discrete sampling means to sample the rectified AC voltage signal associated with the received power conversion means; and when the rectified sampled peak signal has reached a predetermined value, so that the pulse width modulation control chips within the power converter device provides pulse width modulated signal to switch the power switch in the power converter device, so that the power conversion means is provided within a predetermined period of output voltage to the electronic device; otherwise, resulting in a pulse width modulation controller chip provides pulse width modulated signal.

[0020] 基于上述,本发明所提出的电源转换装置及其欠压保护方法主要是运用离散取样手段(即数字信号处理的方式)以对关联于电源转换装置所接收的交流电压的整流信号进行取样。 [0020] The use of discrete sampling means (i.e., a digital signal processing mode) for rectifying an AC voltage signal associated with the power converter means based on the received above, the proposed power converting apparatus of the present invention and undervoltage protection method is the sampling. 一旦被取样的整流信号的峰值于一预设期间内有达到一预设值时(即电源转换装置所接收的交流电压已经稳定,或已经达到电子装置的系统所需的最低电压),则致使脉宽调制控制芯片提供脉宽调制信号以切换功率开关;否则(即电源转换装置所接收的交流电压尚未稳定,或还未达到电子装置的系统所需的最低电压),致使脉宽调制控制芯片停止提供脉宽调制信号。 Once the peak of the rectified signal are sampled within a predetermined time period reaches a predetermined value (i.e., AC power converting apparatus of the received voltage has stabilized or has reached a minimum voltage required for the electronic device system), the resulting pulse-width modulation control chip provides a pulse width modulated signal to switch the power switch; otherwise (i.e., AC power supply voltage converting means received yet stable, or has not yet reached the minimum voltage required for the electronic device system), so that a pulse width modulation control chip stops supplying pulse width modulated signal. 如此一来,即可有效地解决先前技术所述及的问题。 In this way, it can effectively solve the problem and the prior art.

[0021] 为让本发明的上述特征和优点能更明显易懂,下文特举实施例,并配合所附图式作详细说明如下。 [0021] In order to make the above features and advantages of the present invention can be more fully understood, the following non-limiting embodiment, and the accompanying figures are described in detail below.

附图说明 BRIEF DESCRIPTION

[0022] 图1为本发明一实施例的电源转换装置的示意图。 [0022] FIG. 1 is a schematic view of the power conversion apparatus according to an embodiment of the present invention.

[0023] 图2为本发明一实施例的电源转换级的示意图。 [0023] FIG. 2 is a schematic of the power converter stage according to an embodiment of the present invention.

[0024] 图3为本发明一实施例的整流单元的示意图。 [0024] FIG. 3 is a schematic example of a rectifying unit according to an embodiment of the present invention.

[0025] 图4为本发明一实施例的欠压保护单元的示意图。 [0025] FIG. 4 is a schematic undervoltage protection unit according to an embodiment of the present invention.

[0026] 图5为本发明一实施例的欠压保护单元的运作解释图。 [0026] FIG. 5 explained in FIG operating voltage protection unit according to an embodiment of the present invention.

[0027] 图6为本发明一实施例的交流电压与系统电压的示意图。 [0027] FIG. 6 is a schematic of the AC voltage of the system voltage according to an embodiment of the present invention.

[0028] 图7为本发明一实施例的迭加被取样的整流信号的示意图。 [0028] FIG. 7 is a schematic superimposed rectified signal is sampled to an embodiment of the present embodiment of the invention.

[0029] 图8为本发明一实施例的适于电源转换装置的欠压保护方法流程图。 [0029] FIG. 8 of the present invention, a suitable embodiment of the power conversion device under voltage protection method flowchart.

[0030] 主要附图标记说明: [0030] Main reference numerals DESCRIPTION:

[0031] 10:电源转换装置; 101:电源转换级; [0031] 10: power conversion means; 101: power conversion stage;

[0032] 103 :整流单元; 105 :脉宽调制控制芯片; [0032] 103: rectifying means; 105: PWM control chip;

[0033] 107 :反馈单元; 109 :脉宽调制信号产生器; [0033] 107: feedback means; 109: Pulse width modulation signal generator;

[0034] 111:欠压保护单元; 113:过电流保护单元; [0034] 111: voltage protection means; 113: an overcurrent protection unit;

[0035] 201 :全桥整流器; 401 :比较器;[0036] 403 :数字信号处理器(DSP) ; T :变压器; [0035] 201: a full bridge rectifier; 401: comparator; [0036] 403: digital signal processor (DSP); T: transformer;

[0037] P : 一次侧; S” & :二次侧; [0037] P: primary side; S "&: secondary side;

[0038] Q1, Q2 :功率开关; Rs、R :感测电阻; [0038] Q1, Q2: a power switch; Rs, R: sensing resistor;

[0039] DpDyDFpDF2 :二极管; C” C2 :电容;Cap :滤波电容; [0039] DpDyDFpDF2: diode; C "C2: capacitance; Cap: a filter capacitor;

[0040] LD :电子装置; M1〜M6 :晶体管; [0040] LD: an electronic device; M1~M6: a transistor;

[0041] SW:开关; I:参考电流源; [0041] SW: switch; I: reference current source;

[0042] Vref :参考电压; Vbias :偏压; [0042] Vref: Reference voltage; Vbias: a bias;

[0043] Ip :流经变压器之一次侧的电流;Vcc :系统电压; [0043] Ip: current flowing through the primary side of the transformer; Vcc: voltage system;

[0044] V。 [0044] V. UT :输出电压; Vin :输入电压; UT: output voltage; Vin: Input voltage;

[0045] AC_IN:交流电压; AC_IN,:整流信号; [0045] AC_IN: AC voltage; AC_IN ,: rectified signal;

[0046] Vfb :反馈信号 Vpwm:脉宽调制信号 [0046] Vfb: feedback signal Vpwm: pulse width modulated signal

[0047] Vcs:节点的电压; N:节点; Voltage node; N:: [0047] Vcs node;

[0048] Vocp :预设过电流保护参考电压;BOP :欠压保护信号; [0048] Vocp: Overcurrent protection preset reference voltage; BOP: UVP signal;

[0049] CS1, CS2 :控制信号; CMP :比较信号; [0049] CS1, CS2: a control signal; CMP: the comparison signal;

[0050] CLK :时脉信号; SS :切换信号; [0051 ] T0〜T47 :取样的时间Vuvlo : [0050] CLK: clock signal; SS: a switching signal; [0051] T0~T47: sampling time Vuvlo:

[0052] 脉宽调制控制芯片的最低操作电 [0052] The pulse width modulation control chip electrically minimum operating

[0053] 压; [0053] Pressure;

[0054] INI :电源转换装置的初始期间;OPE :电源转换装置的运作期间; During the initial power conversion apparatus; OPE:: [0054] INI period of operation of the power conversion apparatus;

[0055] S801 〜S807 : [0055] S801 ~S807:

[0056] 本发明一实施例的适于电源转换装置的欠压保护方法流程图各步骤。 [0056] The method is suitable for low-voltage protection power conversion device according to an embodiment of the present invention, a flowchart of steps. 具体实施方式 detailed description

[0057] 现将详细参考本发明的示范性实施例,在附图中说明所述示范性实施例的实例。 [0057] will now be detailed with reference to exemplary embodiments of the present invention, an example embodiment of the exemplary embodiments in the accompanying drawings. 另外,凡可能之处,在图式及实施方式中使用相同标号的元件/构件代表相同或类似部分。 Wherever possible, the same reference numerals used in the drawings and the description part of the same or similar elements / member representatives.

[0058] 图1为本发明一实施例的电源转换装置(power conversion apparatus)的示意图。 [0058] FIG. 1 is a schematic example of a power conversion apparatus (power conversion apparatus) according to an embodiment of the present invention. 请参照图1,电源转换装置10包括电源转换级(power conversion stage) 101、整流单元(rectification unit) 103、脉宽调制控制芯片(PWM control chip)105、反馈单元(feedback unit) 107、变压器(transformer) Τ、功率开关(power switch) Q1、感测电阻(sensing resistor)Rs、二极管(Cliode)D1 与D2,以及电容(capacitor)C1 与C20 Referring to FIG. 1, a power conversion apparatus 10 includes a power converter stage (power conversion stage) 101, a rectifying unit (rectification unit) 103, chip pulse width modulation control (PWM control chip) 105, a feedback unit (feedback unit) 107, a transformer ( transformer) Τ, the power switch (power switch) Q1, a sense resistor (sensing resistor) Rs, the diode (Cliode) D1 and D2, and a capacitor (capacitor) C1 to C20

[0059] 在本实施例中,电源转换级101用以接收交流电压(AC V0ltage)AC_IN,并对交流电压AC_IN进行转换后而提供输入电压(input voltage) Vino更清楚来说,图2为本发明一实施例的电源转换级的示意图。 After [0059] In the present embodiment, the power conversion stage 101 to receive an alternating voltage (AC V0ltage) AC_IN, AC_IN AC voltage and by converting the input voltage (input voltage) Vino more clearly, Figure 2 is diagram of a power conversion stage according to one embodiment of the invention. 请参照图2,电源转换级101可以是一种全桥式电源转换器(full bridge power converter),且可以包括有全桥整、流器(full-bridge rectifier) 201 与滤波电容(filter capacitor) Cap。 Referring to FIG 2, the power conversion stage 101 may be a full bridge power converter (full bridge power converter), and may include a full bridge whole, flow (full-bridge rectifier) ​​201 and filter capacitor (filter capacitor) Cap. 其中,全桥整流器201用以接收交流电压AC_IN,并对交流电压AC_IN进行全波整流后而输出。 Wherein the full bridge rectifier for receiving an AC voltage AC_IN 201, and AC voltage AC_IN after full-wave rectification output. 滤波电容Cap耦接全桥整流器201,用以对全桥整流器201的输出进行滤波,以提供输入电压VIN。 Cap filter capacitor 201 is coupled to a full bridge rectifier to filter the full bridge rectifier output 201 to provide an input voltage VIN.

[0060] 简单来说,一旦电源转换级101接收到例如电力公司所提供的交流电压AC_IN后, 电源转换级101就会对所接收的交流电压AC_IN进行全波整流与滤波,从而提供输入电压Vino然而,本发明并不限制于此。 [0060] Briefly, once the power conversion stage 101 receives the AC voltage provided by the power company AC_IN example, the power conversion stage 101 will be received AC_IN AC voltage is full-wave rectified and filtered, to provide the input voltage Vino However, the present invention is not limited thereto. 即,其他类型的电源转换器也可适用于本发明,例如半桥式电源转换器(half bridge power converter)。 That is, other types of power converters according to the present invention is also applicable to, for example, half-bridge power converter (half bridge power converter).

[0061] 整流单元103用以接收交流电压AC_IN,并对交流电压AC_IN进行整流后而提供整流信号AC_IN'。 [0061] The rectifying unit 103 for receiving AC_IN AC voltage, and an AC voltage after rectifying AC_IN provides a rectified signal AC_IN '. 更清楚来说,图3为本发明一实施例的整流单元的示意图。 To be specific, FIG. 3 is a schematic example of a rectifying unit according to an embodiment of the present invention. 请参照图3,整流单元103可以包括有两个二极管DF1与0&。 Referring to FIG 3, the rectifying unit 103 may include two diodes DF1 and & 0. 其中,二极管DF1与0&的阳极(anode)用以接收交流电压AC_IN,而二极管DF1与DF2的阴极(cathode)则用以提供整流信号AC_IN'。 Wherein 0 & diodes DF1 and anode (Anode) for receiving an AC voltage AC_IN, DF1 and DF2 and the diode cathode (Cathode) for providing the rectified signal AC_IN '. 简单来说,二极管DF1与DF2会把交流电压AC_IN转换成一个全波整流信号。 Briefly, the diode DF1 and DF2 will convert the AC voltage into AC_IN a full wave rectified signal.

[0062]变压器 T 具有一次侧(primary side)P 以及二次侧(secondary Si(Ie)S1 与52。其中,变压器T的一次侧P的第一端用以接收输入电压Vin ;变压器T的二次侧S1用以反应于功率开关A的切换而提供输出电压Vqut给电子装置(electronic device) LD ;以及变压器T的二次侧&用以反应于功率开关Gl1的切换而提供系统电压(system voltage) Vcc。 [0062] The transformer T having a primary side (primary side) P and a secondary side (secondary Si (Ie) S1 to 52. wherein the first end of the primary side P of the transformer T for receiving an input voltage Vin; two transformer T secondary side S1 of the power switch to switch in response to the a and provides an output voltage to an electronic device Vqut (electronic device) LD; & secondary side of the transformer T to switch the power switch in response to Gl1 while the system voltage (system voltage and ) Vcc.

[0063] 一般来说,反应在变压器T的二次侧S1的交流电压(由变压器T的一、二次侧P与S1的线圈比(turn ratio)所决定)会经由二极管D1的整流以及电容(^的滤波后以转换成输出电压VOTT。相似地,反应在变压器T的二次侧&的交流电压(由变压器T的一、二次侧卩与&的线圈比所决定)也会经由二极管D2的整流以及电容C2的滤波后以转换成系统电压Vcc。 [0063] In general, the reaction in the AC voltage of the secondary side S1 of the transformer T (determined by a secondary side of the transformer T and P S1 of the winding ratio (turn ratio)) will rectifying diode D1 and a capacitor via after (^ filtered to be converted into an output voltage VOTT. Similarly, the reaction of the secondary alternating voltage side of the transformer T & (determined by a secondary side winding ratio of the transformer T and & Jie) is also via the diode after the filter and rectifier D2 and the capacitor C2 to be converted into a system voltage Vcc.

[0064] 功率开关%的第一端耦接变压器T的一次侧P的第二端;功率开关%的第二端可以透过感测电阻Rs而耦接至一接地电位(ground potential);以及功率开关仏的控制端用以接收脉宽调制控制芯片105所提供的脉宽调制信号(PWM signal) VPWM。 A first end [0064]% of the primary power switch P second end coupled to the transformer T;% of the power switch via the second end may sense resistor Rs is coupled to a ground potential (ground potential); and a control terminal for receiving the power switch Fo pulse width modulation signal (PWM signal) pulse-width modulation control chip 105 provided VPWM. 反馈单元107 用以接收输出电压VOTT,并据以输出关联于电子装置LD的负载状态(loading status)的反馈信号Vfb,从而使得脉宽调制控制芯片105可以根据反馈信号Vfb来调整其所提供的脉宽调制信号VPWM。 The feedback unit 107 for receiving an output voltage VOTT, and outputting the feedback signal Vfb associated with the electronic device LD load state (loading status), so that the pulse width modulation control chip 105 may be adjusted according to it provides the feedback signal Vfb PWM signal VPWM.

[0065] 在此值得一提的是,只要能输出关联于电子装置LD的负载状态的反馈信号的任何电路型态(例如利用电阻分压器搭配光耦合器的反馈电路)都可以当作是本实施例的反馈单元107,故而本实施例在此并不限制反馈电路107的实施方式。 [0065] It is worth mentioning, as long as the output state of the load LD is associated with the electronic circuit device of any type (e.g., by using a resistor divider circuit with a feedback optocoupler) as a feedback signal may be the feedback unit 107 of the present embodiment, therefore the present embodiment is not limited by feedback circuit 107 of the embodiment.

[0066] 脉宽调制控制芯片105耦接整流单元103、变压器T以及功率开关仏,用以接收系统电压\c,并通过整流信号AC_IN'的协助而操作于系统电压Ncc下,而且更运用离散取样手段(discretes amp ling means)以对整流信号AC_IN'进行取样,从而在整流信号AC_IN, 的峰值(peak value)于一预设期间(后面再详述)内有达到一预设值(例如电子装置LD 的系统所需的最低电压)时,提供脉宽调制信号Vpwm来切换功率开关仏。 [0066] The pulse width modulation control chip 105 is coupled to the rectification unit 103, a power switch and a transformer T Fo, for receiving the system voltage \ C, by assisting rectified signal AC_IN 'is operated at a system voltage Ncc, but also the use of discrete sampling means (discretes amp ling means) on the rectified signal to AC_IN 'is sampled during a preset so that (again described in detail later) in the rectified signal AC_IN, peak (peak value) has reached a predetermined value (e.g., electrons in the LD apparatus when required minimum system voltage), pulse width modulated signal Vpwm to provide a switching power switch Fo.

[0067] 更清楚来说,脉宽调制控制芯片105可以包括有脉宽调制信号产生器(PWM signal generator) 109、欠压保护单元(brown-out protection unit) 111,以及过电流保护单元(over-current protection unit) 113。 [0067] To be specific, the pulse width modulation control chip 105 may include a signal generator with a pulse width modulator (PWM signal generator) 109, under-voltage protection unit (brown-out protection unit) 111, and an overcurrent protection unit (over -current protection unit) 113. 其中,脉宽调制信号产生器109耦接功率开关仏的控制端,用以反应于欠压保护单元111所输出的欠压保护信号(brown-out signal)B0P而提供脉宽调制信号VPWM。 Wherein the control terminal of the pulse width modulation signal generator 109 is coupled to the power switch Fo for the signal in response to undervoltage (brown-out signal) B0P voltage protection unit 111 to provide the output pulse width modulated signal VPWM.

[0068] 欠压保护单元111耦接脉宽调制信号产生器109,用以接收并提供整流信号AC_ IN'以协助脉宽调制控制芯片105操作于系统电压Vrc下,并且运用离散取样手段以对整流信号AC_IN'进行取样,从而在整流信号AC_IN'的峰值于整流信号AC_IN'的N个周期(N 为正整数)内有达到电子装置LD的系统所需的最低电压(例如90Vac,但并不限制于此)时,输出欠压保护信号BOP以致使脉宽调制信号产生器109提供脉宽调制信号V™。 [0068] The under-voltage protection unit 111 is coupled to a pulse width modulation signal generator 109 for receiving the rectified signal and providing AC_ IN 'to assist in controlling the pulse width modulation chip 105 at system operating voltage Vrc, and to the use of discrete sampling means rectified signal AC_IN 'sampled so that the rectified signal AC_IN' has the lowest voltage required for the electronic device LD system (e.g. a peak in the rectified signal 90Vac AC_IN 'N cycles (N is a positive integer) within, but not when limited thereto), the output signal voltage protection BOP to cause the pulse width modulation signal generator 109 provides a pulse width modulated signal V ™.

[0069] 过电流保护单元113耦接至功率开关%与感测电阻Rs之间的节点N,用以接收并比较节点N的电压Ves与预设过电流保护参考电压(predetermined over-current protection reference voltage)V。 [0069] The overcurrent protection unit 113 is coupled to the node between the power switch% N and the sensing resistor Rs, for receiving and comparing the voltage of the node N overcurrent protection Ves preset reference voltage (predetermined over-current protection reference voltage) V. CP,以决定是否启动过电流保护机制(OCP mechanism) 来控制脉宽调制信号产生器109是否产生脉宽调制信号Vpwm,从而避免流经变压器T的一次侧P的电流Ip过大(即过电流)而有可能会造成功率开关A与/或电子装置LD的损毁/ 烧毁。 CP, in order to decide whether to start over current protection (OCP mechanism) to control the pulse width modulation signal generator 109 generates a pulse width modulated signal if Vpwm, the primary current Ip so as to avoid excessive P side through the transformer T (i.e., an overcurrent ) and may cause the power switch a and / or damage of the electronic device LD / burned. 举例来说,当节点N的电压V。 For example, when the voltage of the node N V. s大于预设过电流保护参考电压Vot时,则过电流保护单元113会启动过电流保护机制,以控制脉宽调制信号产生器109停止产生脉宽调制信号Vpwm ;反之,则致使脉宽调制信号产生器109正常地产生脉宽调制信号V™。 When s is greater than a preset reference voltage Vot overcurrent protection, overcurrent protection unit 113 starts over current protection mechanism to control the pulse width modulation signal generator 109 stops generating the pulse width modulated signal Vpwm; on the contrary, causes the pulse width modulated signal generator 109 generates a normal pulse width modulation signal V ™.

[0070] 于此,请先回顾本案先前技术所述的内容,传统上,脉宽调制控制芯片很有可能会在电源转换装置所接收的交流电压尚未稳定时(例如欠压,可理解为关联于所接收的交流电压的整流信号的峰值尚未达到电子装置的系统所需的最低电压)就提供脉宽调制信号以切换(即导通或关闭)电源转换装置中的功率开关。 [0070] thereto, please review the case of the prior art content, conventionally, a pulse width modulation control chip is likely to be when the AC voltage received power conversion device has stabilized (e.g. Brown, understood as being associated peak rectified AC voltage signal to the received have not yet reached the desired voltage system of the electronic device) provides pulse width modulated signal to switch (i.e., on or off) the power of the switching power converter means. 如此一来,在功率恒定的条件下,很有可能会造成电源转换装置及/或电子装置的内部元件无法恢复的损毁。 Thus, at a constant power conditions, it is likely to cause damage to the internal components of the power converter means and / or electronic devices can not be restored.

[0071] 有鉴于此,本实施例特别利用欠压保护单元111来解决本案先前技术所述及的问题,且其得以在电源转换装置10所接收的交流电压AC_IN尚未稳定时(即欠压,或还未达到电子装置LD的系统所需的最低电压),协助启动脉宽调制控制芯片105的电源,并且致使脉宽调制控制芯片105停止提供脉宽调制信号Vpwm,从而避免电源转换装置及/或电子装置的内部元件造成无法恢复的损毁。 [0071] Accordingly, the present embodiment is particularly the use of under-voltage protection unit 111 to solve the case of the prior art and problems, and it is when the power conversion apparatus 10 is received AC_IN yet stable AC voltage (i.e. voltage, or has not yet reached the minimum voltage required for the electronic device LD of the system), help start the pulse width modulation control chip power supply 105 and causes the pulse-width modulation control chip 105 provides pulse width modulated signal Vpwm is stopped, thereby avoiding power conversion device and / internal components of the electronic device or cause damage irreversible.

[0072] 更清楚来说,图4为本发明一实施例的欠压保护单元的示意图。 [0072] To be specific, FIG. 4 is a schematic diagram of the undervoltage protection unit according to an embodiment of the invention. 请参照图4,欠压保护单元111可以包括有电阻R、功率开关Q2、开关(switch) SW、晶体管(transistor)M1〜 M6,参考电流源(reference current source)I、比较器(comparator) 401,以及数字信号处理器(digital signal processor,DSP)403。 Referring to Figure 4, voltage protection unit 111 may include a resistor R, a power switch Q2, a switch (switch) SW, a transistor (transistor) M1~ M6, the reference current source (reference current source) I, the comparator (comparator) 401 , and a digital signal processor (digital signal processor, DSP) 403. 在本实施例中,电阻R的第一端用以接收整流信号AC_IN'。 In the present embodiment, a first end of the resistor R to receive the rectified signal AC_IN '. 功率开关%的第一端耦接电阻R的第二端,而功率开关(¾的控制端则用以接收数字信号处理器(DSP)所提供的控制信号(control signal) CSp开关SW的第一端耦接功率开关A的第二端;开关SW的第二端耦接至系统电压\c ;而开关SW的控制端则用以接收数字信号处理器(DSP)所提供的切换信号(switching SignaDSS0 A first end of the first power switch% of a second terminal coupled to the resistor R, and the control terminal of the power switch (¾ control signal received digital signal processor (DSP) is provided for (control signal) CSp switch SW a second terminal coupled to the power terminal of the switch a; a second terminal of switch SW is connected to the system voltage \ C; and the control terminal of the switch SW is configured to receive a digital signal processor (DSP) switching signal (switching SignaDSS0 provided

[0073] 晶体管M1的栅极(gate)用以接收控制信号CS1,而晶体管M1的漏极(drain)贝Ij 耦接功率开关A的第二端。 [0073] The gate of transistor M1 (Gate) for receiving the control signals CS1, and the drain of transistor M1 (Drain) Ij shell coupled to the second terminal of the power switch A. 晶体管M2的栅极与漏极耦接晶体管M1的源极(source),而晶体管M2的源极则耦接至接地电位。 The gate and source of the transistor M2 is coupled to the drain of transistor M1 (source), and the source of transistor M2 is coupled to ground potential. 晶体管M3的栅极耦接晶体管M2的栅极,而晶体管M3的源极则耦接至接地电位。 The gate of transistor M3 is coupled to the gate of transistor M2, and the source of transistor M3 is coupled to ground potential. 其中,晶体管M2的尺寸为晶体管M3的K倍(K为正整数),例如为100,但并不限制于此。 Wherein the transistor M2 is K times the size of transistor M3 (K is a positive integer), for example 100, but is not limited thereto.

[0074] 晶体管M4的源极耦接至偏压(bias voltage) Vbias,而晶体管M4的栅极与漏极则耦接至晶体管M3的的漏极。 Source [0074] The transistor M4 is coupled to a bias voltage (bias voltage) Vbias, and the gate and the drain of the transistor M4 is coupled to the drain of transistor M3 are connected. 晶体管M5的栅极耦接晶体管M4的栅极,而晶体管M5的源极则耦接至偏压Vbias。 The gate of transistor M5 is coupled to the gate of transistor M4, and the source of transistor M5 is coupled to the bias voltage Vbias. 其中,晶体管M4与M5的尺寸相同。 Wherein the transistors M4 and M5 are the same size. 参考电流源I耦接于晶体管M5的漏极与接地电位之间。 I reference current source coupled between the drain of transistor M5 and the ground potential. 晶体管M6的栅极用接收与控制信号CS1互为反相的控制信号(:¾ ;晶体管M6的漏极耦接晶体管M5的漏极;而晶体管M6的源极则耦接至接地电位。于此,上述功率开关Q1与%以及晶体管M1〜M3与M6可以分别为N型晶体管(N-type transistor) •'另夕卜,晶体管M4与M5可以分别为P型晶体管(P-type transistor)。[0075] 比较器401的第一输入端(即正(positive,+)输入端)耦接晶体管M5的漏极; 比较器401的第二输入端(即负(negative,-)输入端)用以接收参考电压Vref ;而比较器401的输出端则用以输出比较信号CMP。其中,参考电流源I的电流(Iref)可以等于参考电压Vref除以一个预设阻值(Rpre),即:Iref = Vref/Rpre。 Receiving a control signal for gate transistor M6 are out of phase control signal CS1 (: ¾; drain coupled to the drain of transistor M5 transistor M6; and a source electrode of the transistor M6 is coupled to the ground potential thereto. the power switch Q1 and the transistor M1~M3% and N-type transistor M6 may be (N-type transistor) • 'Bu Xi other respectively, the transistors M4 and M5 may be P-type transistors, respectively (P-type transistor). [ 0075] the first input terminal of the comparator 401 (i.e., n (positive, +) input terminal) is coupled to the drain of transistor M5; a second input of the comparator 401 (i.e., negative (negative, -) input terminal) for receiving a reference voltage Vref; and the output terminal of the comparator 401 is configured to output a comparison signal CMP wherein the reference current source I (Iref is) may be equal to the reference voltage Vref is divided by a predetermined resistance (RPRE), namely: Iref. = Vref / Rpre.

[0076] 数字信号处理器403用以在电源转换装置10的初始期间(initial phase),提供控制信号CS1与以及切换信号SS,以致使整流信号AC_IN'协助脉宽调制控制芯片105 操作于系统电压Vee下,且在电源转换装置10的运作期间(operation phase),反应于时脉信号(clock signaDCLK而提供控制信号CS1与CS2,以对整流信号AC_IN'进行离散取样, 并据以记录关联于离散取样的比较信号CMP,从而在整流信号AC_IN'的峰值于整流信号AC_IN'的N个周期内有达到电子装置LD的系统所需的最低电压时(即交流电压AC_IN可能已稳定),输出欠压保护信号BOP给脉宽调制信号产生器109,以使得脉宽调制信号产生器109提供/产生脉宽调制信号Vpwm给功率开关仏。 [0076] The digital signal processor 403 to the initial period (initial phase) power conversion apparatus 10 is provided with a control signal CS1 and a switch signal SS, to cause the rectified signal AC_IN 'assist control chip 105 operates a pulse width modulation system voltage under VEE, and during operation of the power conversion device 10 (operation phase), in response to the clock signal (clock signaDCLK provides control signals CS1 and CS2, to the rectified signal AC_IN 'discrete sampled, and accordingly recorded associated discrete sampling the comparison signal CMP, thereby reaching the minimum voltage required for the electronic device LD of the system (i.e., an AC voltage may have stabilized AC_IN) in N cycles 'peaks in the rectified signal AC_IN' AC_IN the rectified signal, an output undervoltage BOP protection signal to a pulse width modulation signal generator 109, so that the pulse width modulation signal generator 109 providing / generating a pulse width modulated signal to the power switch Fo Vpwm.

[0077] 可见得,数字信号处理器403在整流信号AC_IN'的峰值于整流信号AC_IN'的N 个周期内从未达到电子装置LD的系统所需的最低电压时(即交流电压AC_IN尚未稳定), 则不输出欠压保护信号BOP给脉宽调制信号产生器109,从而使得脉宽调制信号产生器109 停止提供/产生脉宽调制信号Vpwm给功率开关仏。 When [0077] have seen, in the digital signal processor 403 'to a peak rectified signal AC_IN' AC_IN rectified signal in N cycles never reaches the minimum voltage required for the electronic device LD of the system (i.e., an AC voltage is not yet stabilized AC_IN) , not output to the BOP UVP signal pulse width modulation signal generator 109 so that the pulse width modulation signal generator 109 stops providing / generating a pulse width modulated signal to the power switch Fo Vpwm.

[0078] 如此一来,即可使得脉宽调制控制芯片105在电源转换装置10所接收的交流电压AC_IN尚未稳定时(例如欠压(brown-out),可理解为关联于所接收的交流电压AC_IN的整流信号AC_IN'的峰值尚未达到电子装置LD的系统所需的最低电压)停止提供脉宽调制信号VPWM,从而停止对电源转换装置10中的功率开关%的切换(即导通或关闭),以避免电源转换装置10及/或电子装置LD的内部元件造成无法恢复的损毁。 [0078] Thus, such a pulse width modulation control to chip 105 when the power conversion apparatus 10 of the received AC voltage AC_IN Not stable (e.g. undervoltage (brown-out), understood as the AC voltage associated with the received the peak rectified signal AC_IN AC_IN 'has not yet reached the minimum voltage required for the electronic device system LD) stops supplying pulse width modulated signal VPWM, thereby stopping the switching of the power conversion apparatus 10% of the power switch (i.e., open or closed) , 10 to prevent and / or the internal components of the electronic device LD power converting apparatus causing damage irreversible.

[0079] 更清楚来说,图5为本发明一实施例的欠压保护单元的运作解释图。 [0079] To be specific, FIG. 5 shows the operation explained in FIG undervoltage protection unit according to an embodiment of the invention. 请合并参照图4与图5,首先,在电源转换装置10的初始期间INI,例如电源转换装置10刚接收到电力公司所提供的交流电压AC_IN,由于交流电压AC_IN尚未稳定,所以数字信号处理器403在此期间(INI)会持续地提供高准位的控制信号CS1与切换信号SS以及低准位的控制信号CS2与欠压保护信号Β0Ρ。 Please refer to FIG. 4 and FIG. 5, first, during the initial INI power conversion device 10, such as a power conversion apparatus 10 has just received the AC voltage provided by the power company AC_IN, AC_IN since AC voltage is not yet stabilized, it is a digital signal processor during this period 403 (INI) will continue to provide high-level control signal CS1 and the switching signal SS is low level and the control signal CS2 to the UVP signal Β0Ρ. 也因如此,脉宽调制信号产生器109便反应于低准位的欠压保护信号BOP而停止提供脉宽调制信号Vpwm给功率开关仏。 Also because of this, the pulse width modulated signal generator 109 will be low level in response to undervoltage protection signal BOP stop pulse width modulated signal provided to the power switch Fo Vpwm.

[0080] 与此同时,功率开关A与开关SW各别反应于高准位的控制信号CS1与切换信号SS 而导通,从而使得整流信号AC_IN'会经由电阻R、功率开关A与开关SW的传导而被提供至反应在变压器T的二次侧&上的系统电压V。 [0080] Meanwhile, the power switch A and the switch SW in response to the respective high-level control signal and the switching signal SS turned CS1, so that the rectified signal AC_IN 'via the resistor will be R, the power switch and the switch SW A conduction voltage is supplied to the reaction system to the secondary side of the transformer T & V. . . 如此一来,整流信号AC_IN'就会协助脉宽调制控制芯片105得以操作于系统电压VrcT,亦即:达到脉宽调制控制芯片105的最低操作电压Vm()(图6为本发明一实施例的交流电压与系统电压的示意图,从图6所示的系统电压V。。的爬升阶段可看出)。 Thus, rectified signal AC_IN 'will assist the control chip 105 is a pulse width modulation systems operating at voltage VRCT, i.e.: a pulse width modulation reaches the minimum operating voltage Vm of the control chip 105 of the () (FIG. 6 an embodiment of the present invention, the schematic diagram of the system voltage alternating voltage, the system voltage V .. climb phase as shown in FIG 6 can be seen). 在整流信号AC_IN'协助脉宽调制控制芯片105得以操作于系统电压下的时候,数字信号处理器403就会改变控制信号CS1与以及切换信号SS的状态,并且维持欠压保护信号BOP的状态,从而关闭功率开关%与开关SW。 Rectifying the signal AC_IN 'assist in controlling the pulse width modulation chip 105 is operating in when the system voltage, the digital signal processor 403 will change the state of the switching control signal CS1 and the SS signal, and maintains the voltage state BOP protection signal, % and thereby closing the power switch switch SW. 换句话说,在电源转换装置10的初始期间INI,欠压保护单元111会导通功率开关%与开关SW以协助启动脉宽调制控制芯片105的电源。 In other words, in the initial period the INI, undervoltage protection unit power switch 111 will be turned on and the switch SW% power conversion apparatus 10 to assist in starting the power supply pulse width modulation control chip 105. 一旦启动脉宽调制控制芯片105的电源后,则关闭功率开关Q2与开关SW。 Once the power supply pulse width modulation control chip 105 starts, the power switch Q2 is turned off and the switch SW.

[0081] 另一方面,在电源转换装置10的运作期间0ΡΕ,由于交流电压AC_IN还有可能 [0081] On the other hand, during the operation of the power conversion apparatus 10 0ΡΕ, since there may be an AC voltage AC_IN

11尚未稳定,即整流信号AC_IN'的峰值尚未达到电子装置LD的系统所需的最低电压(例如90Vac,但并不限制于此),所以数字信号处理器403在此期间(OPE)便会间歇性地(discretely)提供控制信号CS1与CS2,以对整流信号AC_IN'进行离散取样。 11 had stabilized, which is the peak rectified signal AC_IN 'has not yet reached the minimum voltage required for the electronic device LD systems (e.g. 90Vac, but not limited thereto), the digital signal processor 403 during this period (the OPE) will intermittently manner (discretely) provides control signals CS1 and CS2, to the rectified signal AC_IN 'discrete sampling. 在本发明的一实施例中,数字信号处理器403在电源转换装置10的运作期间OPE所提供的控制信号CS1 与可以对整流信号AC_IN'的N个周期(cycle) (N = 24,但并不限制于此,即前述的预设期间)的每一周期进行两次取样(从图5可以清楚地看出,但并不限制于此),即:总共取样48次。 In an embodiment of the present invention, the digital signal processor 403 in the control signal during operation of the power conversion apparatus OPE 10 it is provided and can be rectified signal CS1 AC_IN 'N cycles (cycle) (N = 24, but It is not limited thereto, i.e., the preset period per cycle) is sampled twice (can be clearly seen from FIG. 5, but not limited thereto), namely: sampling a total of 48 times.

[0082] 此外,图7为本发明一实施例的迭加被取样的整流信号的示意图。 [0082] Further, FIG. 7 is a schematic diagram of the embodiment of the rectified signal superimposed one embodiment of the invention sampled. 若对这M个周期进行交迭的话,则可以如图7所示,且这48次的取样的时间Ttl〜T47可以分别表示如下: If these overlap for M cycles, then be 7, 48 and this sampling time can be expressed as follows, respectively Ttl~T47:

[0083] T0 = 0(即起始时间点,但并不限制于此); [0083] T0 = 0 (i.e., the start time point, but not limited thereto);

[0084] T1 = T0+4ms (即预设时间); [0084] T1 = T0 + 4ms (i.e., a predetermined time);

[0085] T2 = Ti+^s+ Δ T ( Δ T = 0. 15ms,即偏移时间,但并不限制于此); [0085] T2 = Ti + ^ s + Δ T (Δ T = 0. 15ms, i.e. the time offset, but not limited thereto);

[0086] T3 = T2+4ms ; [0086] T3 = T2 + 4ms;

[0087] T4 = T3+4ms+ Δ T ; [0087] T4 = T3 + 4ms + Δ T;

[0088] T5 = T4+4ms ; [0088] T5 = T4 + 4ms;

[0089] T6 = T5+4ms+ Δ T ; [0089] T6 = T5 + 4ms + Δ T;

[0090] …; [0090] ...;

[0091] T46 = T45+4ms+ Δ T ;以及 [0091] T46 = T45 + 4ms + Δ T; and

[0092] T47 = T46+4ms0 [0092] T47 = T46 + 4ms0

[0093] 基此条件下,数字信号处理器403所接收的时脉信号CLK的频率(frequency)可以设定为65KHz,但基于不同的设定条件,时脉信号CLK的频率也可随之改变,一切视实际设计需求而论。 [0093] Under this condition group, the clock signal received by the digital signal processor 403 CLK frequency (Frequency) may be set to 65KHz, but based on different setting conditions, when the frequency of the clock signal CLK may be changed with everything depends on practical demands respect.

[0094] 有鉴于此,在电源转换装置10的运作期间0ΡΕ,当控制信号CS1为高准位时,则表示欲对整流信号AC_IN'进行取样。 [0094] In view of this, during the operation of the power conversion apparatus 10 0ΡΕ, when the control signal CS1 is high level, it indicates that the signal to be rectified AC_IN 'sampled. 而且,针对每一次的取样,比较器401都会输出对应的比较信号CMP给数字信号处理器403。 Further, for each sample, the comparator 401 will output a comparison signal corresponding to the digital signal processor 403 CMP. 举例来说,当对整流信号AC_IN'进行取样所反应在晶体管M5的电流小于参考电流源I的电流(Iref)时,则比较器401都会输出例如低准位的比较信号CMP ;反之,当对整流信号AC_IN'进行取样所反应在晶体管M5的电流大于参考电流源I的电流(Iref)时,则比较器401都会输出例如高准位的比较信号CMP。 For example, when the rectified signal AC_IN 'sampling the reaction is less than the reference current transistor M5 of the current source I (Iref is), the comparator 401 will output a low level, for example, the CMP comparison signal; the other hand, when the pair rectified signal AC_IN 'reaction is performed in the sampling current (Iref is) current of transistor M5 is greater than the reference current source I, the comparator 401 will output a high level, for example, comparison signal CMP. 如此一来, 数字信号处理器403即会获得48个分别对应于对整流信号AC_IN'所进行的48次取样的比较信号CMP,由此再进行记录。 Thus, the digital signal processor 403 will receive i.e. 48 respectively corresponding to the comparison signal CMP 48 sub-sampled rectified signal AC_IN 'carried thereby then recorded.

[0095] 一旦所获得的48个比较信号CMP的其中一个为高准位的话,则数字信号处理器403就会判定交流电压AC_IN已稳定(即整流信号AC_IN'的峰值已达到电子装置LD的系统所需的最低电压(90Vac)),从而在对整流信号AC_IN'进行完48次取样之后提供高准位的欠压保护信号BOP给脉宽调制信号产生器109。 [0095] 48 Once the comparison signal CMP is obtained wherein a high level, then the digital signal processor 403 will then determine AC_IN AC voltage has stabilized (i.e. rectified signal AC_IN 'have reached the peak of the system of the electronic device LD the minimum required voltage (90Vac)), whereby the rectified signal AC_IN 'End for providing a high level of BOP UVP signal to a pulse width modulation signal generator 48 after 109 samples. 如此一来,脉宽调制信号产生器109就会开始提供脉宽调制信号Vpwm以切换功率开关%,从而使得电源转换装置10供应输出电压Vqut给电子装置LD。 Thus, the pulse width modulation signal generator 109 will begin to provide a pulse width modulated signal to switch the power switch Vpwm%, so that the power converter apparatus 10 supplies an output voltage to the electronic device Vqut LD. 换句话说,在电源转换装置10的运作期间0ΡΕ,欠压保护单元111会在交流电压AC_IN尚未稳定时,致使脉宽调制控制芯片105停止提供脉宽调制信号Vpwm,直至交流电压AC_IN稳定为止(即整流信号AC_IN'的峰值已达到电子装置LD的系统所需的最低电压(90Vac))。 In other words, during the operation of the power conversion apparatus 10 0ΡΕ, undervoltage protection unit 111 will AC_IN the AC voltage is not yet stabilized, resulting in a pulse width modulation control chip 105 stops supplying pulse width modulated signal Vpwm, AC_IN until the AC voltage is stable ( which is the peak rectified signal AC_IN 'has reached a minimum voltage (90Vac)) required for the electronic device LD system. 如此一来,即可有效地解决先前技术所述及的问题。 In this way, it can effectively solve the problem and the prior art.

1[0096] 基于上述实施例所揭示的内容,以下将汇整出一种适于电源转换装置的欠压保护方法给本发明领域的普通技术人员参详/参考。 1 [0096] Based on the contents disclosed in the above-described embodiment, the aggregate will undervoltage protection method suitable to the power converter apparatus of ordinary skill in the art of the present invention in detail reference / reference.

[0097] 图8为本发明一实施例的适于电源转换装置的欠压保护方法流程图。 [0097] FIG. 8 of the present invention, a suitable embodiment of the power conversion device under voltage protection method flowchart. 请参照图8, 本实施例的欠压保护方法包括: Referring to FIG 8, the present embodiment undervoltage protection method comprising:

[0098] 运用离散取样手段以对关联于电源转换装置所接收的交流电压的整流信号进行取样(步骤S801); [0098] Application of the discrete sampling means for sampling (step S801) associated with the AC voltage of the power converter apparatus of the received rectified signal;

[0099] 判断被取样的整流信号的峰值于预设期间内有无达到预设值(步骤S803);以及 [0099] Analyzing the peak of the rectified signal is sampled in the presence or absence of a preset period reaches a preset value (step S803); and

[0100] 当被取样的整流信号的峰值于预设期间内有达到预设值时,则致使电源转换装置内的脉宽调制控制芯片提供脉宽调制信号以切换电源转换装置内的功率开关,从而使得电源转换装置提供输出电压给电子装置(步骤S805);否则,致使脉宽调制控制芯片停止提供脉宽调制信号(步骤S807)。 [0100] When the peak period of the rectified signal is sampled to a preset time has reached the preset value, so that the pulse width modulation control chip power converter means to provide pulse width modulated signal to switch the power switch in the power conversion means, so that the output voltage of the power conversion device provides to the electronic device (step S805); otherwise, resulting in a pulse width modulation controller chip provides pulse width modulated signal (step S807).

[0101] 综上所述,本发明所提出的电源转换装置可以在其所接收的交流电压尚未稳定时(即欠压),先协助启动脉宽调制控制芯片的电源,从而让脉宽调制控制芯片可以进一步地施行欠压保护机制。 [0101] As described above, the power conversion device of the present invention can be made at the time it receives the AC voltage has stabilized (i.e. undervoltage), to help start the power control chip pulse width modulation, pulse width modulation control so that the chip can be further implemented under-voltage protection. 而且,本发明所提出的电源转换装置及其欠压保护方法主要是运用离散取样手段(即数字信号处理的方式)以对关联于电源转换装置所接收的交流电压的整流信号进行取样。 Furthermore, the proposed power converting apparatus of the present invention and method is the use of under-voltage protection discrete sampling means (i.e., a digital signal processing mode) for rectifying an AC voltage signal associated with the power converter means for sampling the received. 一旦被取样的整流信号的峰值于一预设期间内有达到一预设值时(即电源转换装置所接收的交流电压已经稳定,或已经达到电子装置的系统所需的最低电压),则致使脉宽调制控制芯片提供脉宽调制信号以切换功率开关;否则(即电源转换装置所接收的交流电压尚未稳定,或还未达到电子装置的系统所需的最低电压),致使脉宽调制控制芯片停止提供脉宽调制信号。 Once the peak of the rectified signal are sampled within a predetermined time period reaches a predetermined value (i.e., AC power converting apparatus of the received voltage has stabilized or has reached a minimum voltage required for the electronic device system), the resulting pulse-width modulation control chip provides a pulse width modulated signal to switch the power switch; otherwise (i.e., AC power supply voltage converting means received yet stable, or has not yet reached the minimum voltage required for the electronic device system), so that a pulse width modulation control chip stops supplying pulse width modulated signal. 如此一来,即可避免电源转换装置及/或电子装置的内部元件造成无法恢复的损毁。 Thus, to avoid the power conversion apparatus internal components and / or electronic devices will damage irreversible.

[0102] 虽然本发明已以实施例说明如上,然其并非用以限定本发明,任何所属技术领域的普通技术人员,在不脱离本发明的精神和范围内,当可作部分改动或等同替换,故本发明的保护范围以本申请的权利要求所界定的范围为准。 [0102] Although the present invention has been described in Example above, they are not intended to limit the present invention, any person of ordinary skill in the art, without departing from the spirit and scope of the present invention, may make some changes or equivalent replacements , so the scope of the invention defined by the scope of the claims of the present application defined.

Claims (15)

  1. 1. 一种电源转换装置,其特征在于,包括:一电源转换级,用以接收一交流电压,并对该交流电压进行转换后而提供一输入电压;一整流单元,用以接收该交流电压,并对该交流电压进行整流后而提供一整流信号; 一变压器,具有一一次侧、一第一二次侧与一第二二次侧,其中该一次侧的第一端用以接收该输入电压,该第一二次侧用以提供一输出电压给一电子装置,而该第二二次侧则用以提供一系统电压;一第一功率开关,其第一端耦接该一次侧的第二端,其第二端耦接至一接地电位,而其控制端则用以接收一脉宽调制信号;以及一脉宽调制控制芯片,耦接该整流单元、该变压器以及该第一功率开关,用以接收该系统电压,并通过该整流信号的协助而操作于该系统电压下,而且更运用一离散取样手段以对该整流信号进行取样,从而在该整流信号的 1. A power conversion device comprising: a power conversion stage, for receiving an AC voltage and the converted AC voltage to provide an input voltage; a rectifying unit for receiving the alternating voltage after the rectified AC voltage and providing a rectified signal; a transformer having a primary side and a secondary side of a first and a second secondary side, wherein the first end of the primary side for receiving the input voltage, the secondary side for providing a first output voltage to an electronic device, and the second secondary-side system is configured to provide a voltage; a first power switch having a first terminal coupled to the primary side a second terminal, a second terminal coupled to a ground potential, and the control terminal for receiving a pulse width modulated signal; and a pulse width modulation control chip, coupled to the rectifying unit and the first transformer a power switch for receiving the system voltage, by assisting the rectified signal operates at the system voltage, but also the use of a discrete sampling means for sampling the rectified signal, whereby the rectified signal 峰值于一预设期间内有达到一预设值时,提供该脉宽调制信号来切换该第一功率开关。 Peaks within a predetermined period of time has reached a predetermined value, to provide the PWM signal to switch the first power switch.
  2. 2.根据权利要求1所述的电源转换装置,其特征在于,其中该脉宽调制控制芯片包括: 一脉宽调制信号产生器,耦接该第一功率开关的控制端,用以反应于一欠压保护信号而提供该脉宽调制信号;以及一欠压保护单元,耦接该脉宽调制信号产生器,用以接收并提供该整流信号以协助该脉宽调制控制芯片操作于该系统电压下,并且运用该离散取样手段以对该整流信号进行取样,从而在该整流信号的峰值于该预设期间内有达到该预设值时,输出该欠压保护信号。 2. A power conversion apparatus according to claim 1, wherein, wherein the PWM controller chip comprising: a pulse width modulation signal generator, coupled to the control terminal of the first power switch to in response to a UVP signal and providing the pulse width modulated signal; and an under-voltage protection unit, coupled to the pulse width modulation signal generator for receiving the rectified signal and providing a pulse width modulation control to assist the operation of the chip to the system voltage next, and the use of the discrete sampling means for sampling the rectified signal, thereby in the preset period of the peak rectified signal reaches the predetermined value, the output signal of the undervoltage protection.
  3. 3.根据权利要求2所述的电源转换装置,其特征在于,其中该欠压保护单元包括: 一第一电阻,其第一端用以接收该整流信号;一第二功率开关,其第一端耦接该第一电阻的第二端,而其控制端则用以接收一第一控制信号;一开关,其第一端耦接该第二功率开关的第二端,其第二端耦接该系统电压,而其控制端则用以接收一切换信号;一第一晶体管,其栅极用以接收该第一控制信号,而其漏极则耦接该第二功率开关的Λ-Λ- ~·上山弟一兄而;一第二晶体管,其栅极与其漏极耦接该第一晶体管的源极,而其源极则耦接至该接地电位;一第三晶体管,其栅极耦接该第二晶体管的栅极,而其源极则耦接至该接地电位; 一第四晶体管,其源极耦接至一偏压,而其栅极与其漏极则耦接至该第三晶体管的漏极;一第五晶体管,其栅极耦接该第四晶体管的栅极,而 3. The power conversion apparatus according to claim 2, wherein, wherein the undervoltage protection unit comprises: a first resistor having a first terminal for receiving the rectified signal; a second power switch having a first terminal coupled to the second terminal of the first resistor, and the control terminal for receiving a first control signal; a switch having a first terminal coupled to the second terminal of the second power switch, a second terminal coupled then the system voltage, and a control terminal is configured to receive a switching signal; a first transistor having a gate receiving the first control signal, and a drain coupled to the second power switch Λ-Λ - ~ a brother-brother and mountains; a second transistor, a gate and its drain coupled to the source of the first transistor, and its source is coupled to the ground potential; a third transistor, a gate coupled to the gate of the second transistor, and its source is coupled to the ground potential; a fourth transistor having a source coupled to a bias voltage, and its gate and its drain coupled to the first the drain of the third transistor; a fifth transistor having a gate coupled to the gate of the fourth transistor, and 源极则耦接至该偏压; 一参考电流源,耦接于该第五晶体管的漏极与该接地电位之间; 一第六晶体管,其栅极用以接收与该第一控制信号互为反相的一第二控制信号,其漏极耦接该第五晶体管的漏极,而其源极则耦接至该接地电位;一比较器,其第一输入端耦接该第五晶体管的漏极,其第二输入端用以接收一参考电压,而其输出端则用以输出一比较信号;以及一数字信号处理器,用以在该电源转换装置的一初始期间,提供该第一与该第二控制信号以及该切换信号,以致使该整流信号协助该脉宽调制控制芯片操作于该系统电压下, 且在该电源转换装置的一运作期间,反应于一时脉信号而提供该第一与该第二控制信号, 通过对该整流信号进行一离散取样,并据以记录关联于该离散取样的该比较信号,从而在该整流信号的峰值于该预设期间内有达到 The source is coupled to the bias voltage; a reference current source coupled between the drain of the fifth transistor and ground potential; a sixth transistor having a gate receiving the first control signal and the cross as a second inverted control signal, a drain coupled to the drain of the fifth transistor, and its source is coupled to the ground potential; a comparator having a first input terminal coupled to the fifth transistor a drain, a second input for receiving a reference voltage, and its output terminal is used for outputting a comparison signal; and a digital signal processor for an initial period in the power conversion apparatus to provide the first and a second control signal and the switching signal, so that the rectified signal to the PWM controller chip assist operation at the system voltage, and during the operation of a power conversion apparatus, in response to a clock signal provided to the first, by carrying out a discrete sampling the rectified signal, and according to the comparison signal to record associated with the discrete sampling, and thereby the second control signal the peak value of the rectified signal is reached within the predetermined period 预设值时,输出该欠压保护信号。 When the preset value, the output signal of the undervoltage protection.
  4. 4.根据权利要求3所述的电源转换装置,其特征在于,其中该预设期间包括该整流信号的N个周期,N为一正整数。 4. The power conversion apparatus according to claim 3, characterized in that, wherein the predetermined period includes N cycles of the rectified signal, N being a positive integer.
  5. 5.根据权利要求4所述的电源转换装置,其特征在于,其中该数字信号处理器在该电源转换装置的该初始期间所提供的该第一与该第二控制信号会对该整流信号的所述N个周期的每一周期进行M次取样,从而使得该数字信号处理器在该电源转换装置的该初始期间对该整流信号进行N*M次取样,其中M小于N。 The power converting apparatus according to claim 4, wherein the first and the second control signal will be of the rectified signal, wherein the digital signal processor in the initial period of the power converter apparatus is provided each said period of N cycles is sampled M times, so that the digital signal processor sub-sampled N * M in the initial period of the rectified signal of the power converter apparatus, where M is less than N.
  6. 6.根据权利要求5所述的电源转换装置,其特征在于,其中该数字信号处理器对该整流信号所进行的第i次取样时间Ti为第i-Ι次取样时间IV1 加上一预设时间,i为奇数正整数;以及该数字信号处理器对该整流信号所进行的第i+Ι次取样时间Tw为第i次取样时间Ti 加上该预设时间与一偏移时间ΔΤ。 The power conversion apparatus according to claim 5, characterized in that the i-th sampling time of the digital signal processor wherein the rectified signal is performed by the i-Ti iota sampling times plus a predetermined IV1 time, i is a positive odd integer; and the i + Tw iota sampling times of the digital signal processor of the rectified signal is carried out i-th sampling time Ti plus the predetermined offset time and a time ΔΤ.
  7. 7.根据权利要求3所述的电源转换装置,其特征在于,其中该第一与该第二功率开关、该第一至该第三晶体管,以及该第六晶体管分别为一N型晶体管;以及该第四与该第五晶体管分别为一P型晶体管。 The power conversion apparatus according to claim 3, characterized in that, wherein the first and the second power switch, the first to the third transistor, and the sixth transistor is an N-type transistor, respectively; and the fourth and the fifth transistor is a P-type transistor, respectively.
  8. 8.根据权利要求3所述的电源转换装置,其特征在于,其中该第二晶体管的尺寸为第三晶体管的K倍,而该第四与该第五晶体管的尺寸相同,K为一正整数。 8. The power conversion device according to claim 3, wherein wherein the size of the second transistor is K times the third transistor, and the fourth with the same dimensions of the fifth transistor, K is a positive integer .
  9. 9.根据权利要求1所述的电源转换装置,其特征在于,其中该电源转换级包括: 一全桥整流器,用以接收该交流电压,并对该交流电压进行全波整流后输出;以及一滤波电容,耦接该全桥整流器,用以对该全桥整流器的输出进行滤波,以提供该输入电压。 9. The power conversion apparatus according to claim 1, wherein, wherein the power conversion stage comprising: after a full-bridge rectifier for receiving the AC voltage and the AC voltage is full-wave rectified output; and a filter capacitor, coupled to the full bridge rectifier, the output of the full bridge rectifier for filtering, for providing the input voltage.
  10. 10.根据权利要求1所述的电源转换装置,其特征在于,其中该整流单元包括:一第一二极管;以及一第二二极管,其中,该第一与该第二二极管的阳极用以接收该交流电压,而该第一与该第二二极管的阴极则用以提供该整流信号。 10. The power conversion apparatus according to claim 1, wherein, wherein the rectifying unit comprises: a first diode; and a second diode, wherein the first and the second diode an anode for receiving the alternating voltage, and the first cathode of the second diode is to provide the rectified signal.
  11. 11.根据权利要求1所述的电源转换装置,其特征在于,更包括: 一感测电阻,耦接于该第一功率开关的第二端与该接地电位之间。 11. The power conversion apparatus according to claim 1, characterized in that, further comprising: a sensing resistor coupled between the second terminal and the ground potential of the first power switch.
  12. 12.根据权利要求11所述的电源转换装置,其特征在于,其中该脉宽调制控制芯片更包括:一过电流保护单元,耦接至该第一功率开关与该感测电阻之间的一节点,用以接收并比较该节点的电压与一预设过电流保护参考电压,以决定是否启动一过电流保护机制来控制该脉宽调制信号产生器是否产生该脉宽调制信号。 12. The power converter apparatus as claimed in claim 11, wherein, wherein the PWM control chip further comprising: an over-current protection unit, coupled to a first power between the switch and the sensing resistor node for receiving and comparing the voltage of the node with a predetermined reference voltage overcurrent protection, to determine whether to activate an over current protection mechanism to control whether the PWM signal generator generates the PWM signal.
  13. 13.根据权利要求1所述的电源转换装置,其特征在于,更包括:一反馈单元,用以接收该输出电压,并据以输出关联于该电子装置的负载状态的一反馈信号。 13. A power conversion apparatus according to claim 1, characterized in that, further comprising: a feedback unit for receiving the output voltage, and outputting a feedback signal related to the load state of the electronic device.
  14. 14.根据权利要求13所述的电源转换装置,其特征在于,其中该脉宽调制控制芯片更用以根据该反馈信号来调整该脉宽调制信号。 14. A power conversion apparatus according to claim 13, wherein, wherein the PWM controller chip is further configured to adjust the PWM signal according to the feedback signal.
  15. 15. 一种欠压保护方法,适于一电源转换装置,其特征在于,而该欠压保护方法包括: 运用一离散取样手段以对关联于该电源转换装置所接收之一交流电压的一整流信号进行取样;以及当该被取样的整流信号的峰值于一预设期间内有达到一预设值时,则致使该电源转换装置内的一脉宽调制控制芯片提供一脉宽调制信号以切换该电源转换装置内的一功率开关,从而使得该电源转换装置提供一输出电压给一电子装置;否则,致使该脉宽调制控制芯片停止提供该脉宽调制信号。 15. A method for undervoltage protection, suitable for a power conversion apparatus, wherein the undervoltage protection and the method comprising: using a discrete sampling means to a received one of the rectified AC voltage to the power converter device associated with the signal sampling; and when the peak value of the rectified signal is sampled has reached a predetermined value within a predetermined period, a pulse width modulation control of the resulting chips within the power converter provides a means to switch the pulse width modulation signal a power switch in the power converter device, so that the power converter means providing an output voltage to an electronic device; otherwise, so that the PWM controller chip providing the pulse width modulated signal.
CN 201010540938 2010-11-09 2010-11-09 Power converter and undervoltage protection method thereof CN102468771A (en)

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