WO2018090558A1 - 一种同步整流电路 - Google Patents

一种同步整流电路 Download PDF

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WO2018090558A1
WO2018090558A1 PCT/CN2017/081385 CN2017081385W WO2018090558A1 WO 2018090558 A1 WO2018090558 A1 WO 2018090558A1 CN 2017081385 W CN2017081385 W CN 2017081385W WO 2018090558 A1 WO2018090558 A1 WO 2018090558A1
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module
tube
voltage
logic control
charge pump
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PCT/CN2017/081385
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English (en)
French (fr)
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李泽宏
汪榕
弋才敏
吴玉舟
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贵州恒芯微电子科技有限公司
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Publication of WO2018090558A1 publication Critical patent/WO2018090558A1/zh
Priority to US16/374,712 priority Critical patent/US10523129B2/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load

Definitions

  • the invention belongs to electronic circuit technology, and in particular relates to a synchronous rectification circuit.
  • Synchronous Rectification uses a low voltage power MOS transistor as a rectifying device. With its low forward voltage drop and low on-state resistance, the overall power consumption of the rectifier module can be well reduced.
  • the main difficulty in using synchronous rectification technology is the gate control of its rectifier.
  • the driving of the rectifier tube mainly adopts the PWM method, and its implementation is complicated. It is necessary to establish a space vector mathematical model and perform complex transformation solving. Circuit composition requires a lot of logic processing, increasing technical difficulty and cost. The application of external power supply is more complicated, and the charge pump self-driving method has a slower charging speed, which is not conducive to the promotion and application of synchronous rectification technology.
  • the invention provides a synchronous rectification circuit, comprising: a low voltage charge pump module, a Boost module, an external capacitor C and a rectifier tube M1; wherein the low voltage charge pump module is composed of an oscillator and a charge pump; the Boost module is controlled by a logic module 1 and logic Control 2 module, voltage detection 1 module, voltage detection 2 module, PWM generation module, reference voltage generation module, switch tube PM1, freewheeling tube NM2, isolation tube NM1, inductor L, and sampling resistors R1 and R2; The drain of the tube NM1 is connected to the drain of the rectifier M1, the source is connected to the source of the flow tube NM2, the lower end of the sampling resistor R2 and the lower plate of the external capacitor C, and the gate is connected to the source of the rectifier M1 and the inductance L.
  • the source of the switch tube PM1 is connected to the oscillator, the upper plate of the external capacitor C, the input terminal of the voltage detecting 2 module, the drain is connected to the other end of the inductor L and the drain of the freewheeling tube NM2; the external capacitor C is connected The input terminal of the voltage detecting 1 module, the output end of the charge pump; the input end of the charge pump is connected to the oscillator; the sampling resistor R1 is connected in series with R2, and the common connection end and the input of the PWM generating module Terminal connection An input terminal and an external upper plate of the capacitor C is connected to the other end of the voltage detecting R1 module 1, the other end of the sampling resistor R2 is electrically connected to an external The lower plate of the capacitor C, the voltage Vf generated by dividing the sampling resistors R1 and R2 in series and the voltage Vref generated by the reference voltage generating module as the input end of the PWM generating module; the first input terminal of the logic control 1 module is connected to the voltage The output end of the module
  • the logic control 1 module controls the switches of the switch tube PM1 and the freewheeling tube NM2 of the Boost module
  • the logic control 2 module controls the switch of the rectifier tube M1.
  • the switch tube PM1 is a P-type MOS tube or a PNP bipolar transistor
  • the free-wheeling tube NM2 is an N-type MOS tube or an NPN bipolar transistor.
  • the rectifier M1 is a VDMOS or an LDMOS.
  • the synchronous rectification circuit provided by the invention is used for controlling the operation of an oscillator, a freewheeling tube, a switching tube and a rectifier tube, the oscillator is used for controlling the operation of the charge pump, and the charge pump is used for charging the capacitor.
  • the capacitor provides a gate drive to the rectifier through a logic control module.
  • the low-voltage charge pump + boost combines the self-driving mode, which does not require external extra power supply, accelerates the charging of the capacitor, reduces the duty cycle of the rectifier circuit, reduces the average conduction voltage drop, greatly reduces the application complexity and improves The scope of application.
  • FIG. 1 is a schematic structural diagram of a synchronous rectification circuit according to an embodiment of the present invention.
  • the synchronous rectification circuit comprises: a low voltage charge pump module, a Boost module, an external capacitor C and a rectifier M1;
  • the low voltage charge pump module is composed of an oscillator and a charge pump
  • the Boost module consists of a logic control 1 module, a logic control 2 module, a voltage detection 1 module, a voltage detection 2 module, a PWM generation module, a reference voltage generation module, a switch tube PM1, a freewheeling tube NM2, an isolation tube NM1, an inductor L, and a sampling.
  • the resistors R1 and R2 are formed;
  • the drain of the isolation tube NM1 is connected to the drain of the rectifier M1, the source is connected to the source of the flow tube NM2, the lower end of the sampling resistor R2 and the lower plate of the external capacitor C, and the gate is connected to the source of the rectifier M1.
  • One end of the inductor L; the source of the switch tube PM1 is connected to the oscillator, the upper plate of the external capacitor C, the input terminal of the voltage detecting 2 module, the drain is connected to the other end of the inductor L and the drain of the freewheeling tube NM2;
  • the upper plate of the external capacitor C is connected to the input end of the voltage detecting 1 module, and the output end of the charge pump;
  • An input of the charge pump is coupled to the oscillator
  • the sampling resistor R1 is connected in series with R2, and the common connection end is connected to the input end of the PWM generating module, and the other end of the sampling resistor R1 is connected to the input end of the voltage detecting 1 module and the upper plate of the external capacitor C, and the other end of the sampling resistor R2 is connected. a lower plate of the external capacitor C, a voltage Vf generated by dividing the sampling resistors R1 and R2 in series, and a voltage Vref generated by the reference voltage generating module as an input end of the PWM generating module;
  • the first input end of the logic control 1 module is connected to the output end of the voltage detection 1 module, the second input end is connected to the output end of the PWM generating module, and the third input end is connected to the output end of the logic control 2 module;
  • the first output end of the logic control 1 module is connected to the gate of the freewheeling tube NM2, the second output end is connected to the gate of the switching tube PM1, and the third output end is connected to the oscillator;
  • the input end of the voltage detection 2 module is connected to the upper plate of the external capacitor C, the output end is connected to the input end of the logic control 2 module, and the output end of the logic control 2 module is connected to the gate of the rectifier M1.
  • the synchronous rectification circuit in this embodiment uses a charge pump and a boost boosting technology instead of the conventional PWM driving method.
  • the low-voltage charge pump + boost combines the self-driving mode, which does not require external extra power supply, accelerates the charging of the capacitor, reduces the duty cycle of the rectifier circuit, reduces the average conduction voltage drop, greatly reduces the application complexity and improves The scope of application.
  • the program includes a rectifier M1, a charge pump, a logic control module, a voltage detection module, an oscillator, a PWM generation module, a reference voltage generation module, a switch tube PM1, a freewheeling tube NM2, a rectifier tube M1, an inductor L, an external capacitor C, and Sampling resistors R1, R2.
  • the logic control 1 module controls the switches of the switch tube PM1 and the freewheeling tube NM2 of the Boost module
  • the logic control 2 module controls the switch of the rectifier tube M1.
  • the voltage detection 1 module When the potential on the external capacitor C reaches the working condition of the Boost module, the voltage detection 1 module outputs a control signal, turns off the low-voltage charge pump module, starts the Boost module, and continues to boost the external capacitor C, and the voltage detection module 2 The voltage value on the external capacitor C is detected.
  • the logic control 2 module turns on the rectifier M1, simultaneously turns off the Boost module, and stops charging the external capacitor C. Let this stage work time is T2
  • the Boost module and the low-voltage charge pump module stop working, the energy of the external capacitor C maintains the rectifier M1 turned on, and the voltage detection 2 module detects the voltage on the external capacitor C, when the voltage on the external capacitor C drops to When the preset lower limit value VL is reached, the logic control 2 module turns off the rectifier M1, and at this time, the low-voltage charge pump module starts, and the external capacitor C continues to charge and boost. Let the working time of this stage be T3.
  • the switch tube PM1 may be a P-type MOS tube or a PNP bipolar transistor; the free-wheeling tube NM2 may be an N-type MOS tube or an NPN bipolar transistor.
  • the rectifier M1 may be a VDMOS or an LDMOS.
  • the synchronous rectification circuit of the scheme adopts a combination of low-voltage charge pump and Boost.
  • the driving mode eliminates the need for external extra power supply, accelerates the charging of the capacitor, reduces the duty cycle of the rectifier circuit, and reduces the average conduction voltage drop, which greatly reduces the application complexity and improves the application range.
  • the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Rectifiers (AREA)

Abstract

一种同步整流电路，属于电子电路技术，所述同步整流电路主要通过电荷泵和Boost升压电路，即Boost模块相结合的方式实现自驱动；其包括整流管、电荷泵单元、逻辑控制模块、电压检测模块、振荡器模块、PWM产生模块、基准电压产生模块、开关管、续流管、隔离管、电感、电容和采样电阻。初始阶段通过电荷泵在电容上存储电荷，等到电压升高到一定程度，Boost拓扑结构的升压电路开始工作，通过逻辑控制模块等的处理，打开整流管，实现同步整流电路的自驱动。其低压电荷泵＋Boost相结合的驱动方式，加快给电容充电的速度，降低整流电路的占空比，降低平均导通压降。

Description

一种同步整流电路 技术领域
本发明属于电子电路技术，具体的说是涉及一种同步整流电路。
背景技术
同步整流技术(Synchronous Rectification，SR)采用低电压功率MOS管作为整流器件。利用其较低的正向压降和很小的通态电阻，可以很好的降低整流器模块的整体功耗。采用同步整流技术的主要难度在于其整流管的栅极控制。
整流管的驱动主要采用PWM方式，其实现较为复杂，需要建立空间矢量数学模型，进行复杂的变换求解。电路组成上需要大量的逻辑处理，增加技术难度和成本。采用外部供电驱动的方式应用上较为复杂，而单独的电荷泵自驱动方式充电速度较慢，不利于同步整流技术的推广与应用。
发明内容
本发明提供一种同步整流电路，包括：低压电荷泵模块、Boost模块、外接电容C和整流管M1；其中，低压电荷泵模块由振荡器、电荷泵构成；Boost模块由逻辑控制1模块、逻辑控制2模块、电压检测1模块、电压检测2模块、PWM产生模块、基准电压产生模块、开关管PM1、续流管NM2、隔离管NM1、电感L、和取样电阻R1与R2构成；其中，隔离管NM1的漏极接整流管M1的漏极，源极接续流管NM2的源极、取样电阻R2的下端和外接电容C的下极板，栅极接整流管M1的源极和电感L的一端；开关管PM1的源极接振荡器、外接电容C的上极板、电压检测2模块的输入端，漏极接电感L的另一端和续流管NM2的漏极；外接电容C的上极板接电压检测1模块的输入端，所述电荷泵的输出端；所述电荷泵的输入端连至所述振荡器；取样电阻R1与R2串联，其公共连接端与PWM产生模块的输入端连接，取样电阻R1的另一端连接电压检测1模块的输入端和外接电容C的上极板，取样电阻R2的另一端连接外接电 容C的下极板，取样电阻R1与R2串联分压后产生的电压Vf与所述基准电压产生模块产生的电压Vref作为PWM产生模块的输入端；逻辑控制1模块的第一输入端连接电压检测1模块的输出端，第二输入端连接PWM产生模块的输出端，第三输入端连接逻辑控制2模块的输出端；逻辑控制1模块的第一输出端接在续流管NM2的栅极，第二输出端接在开关管PM1的栅极，第三输出端接到振荡器；电压检测2模块的输入端连接外接电容C的上极板，输出端连接逻辑控制2模块的输入端，逻辑控制2模块的输出端连接整流管M1的栅极。
进一步的，所述逻辑控制1模块控制所述Boost模块的开关管PM1和续流管NM2的开关，所述逻辑控制2模块控制整流管M1的开关。
进一步的，开关管PM1为P型mos管或者PNP双极型晶体管；续流管NM2为N型mos管或者NPN双极型晶体管。
进一步的，所述整流管M1为VDMOS或者LDMOS。
本发明提供的同步整流电路，逻辑控制模块用于控制振荡器、续流管、开关管和整流管的工作，振荡器用于控制电荷泵的工作，所述电荷泵用于向电容充电，所述电容通过逻辑控制模块为整流管提供栅极驱动。其低压电荷泵+boost相结合的自驱动方式，不需要外部额外供电，同时加快给电容充电的速度，降低整流电路的占空比，降低平均导通压降，大大降低了应用复杂度，提高了应用范围。
附图说明
图1是本发明实施例提供的同步整流电路的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
图1为本发明实施例提供的同步整流电路的结构示意图，如图1所 示，该同步整流电路，包括：低压电荷泵模块、Boost模块、外接电容C和整流管M1；
其中，低压电荷泵模块由振荡器、电荷泵构成；
Boost模块由逻辑控制1模块、逻辑控制2模块、电压检测1模块、电压检测2模块、PWM产生模块、基准电压产生模块、开关管PM1、续流管NM2、隔离管NM1、电感L、和取样电阻R1与R2构成；
其中，隔离管NM1的漏极接整流管M1的漏极，源极接续流管NM2的源极、取样电阻R2的下端和外接电容C的下极板，栅极接整流管M1的源极和电感L的一端；开关管PM1的源极接振荡器、外接电容C的上极板、电压检测2模块的输入端，漏极接电感L的另一端和续流管NM2的漏极；
外接电容C的上极板接电压检测1模块的输入端，所述电荷泵的输出端；
所述电荷泵的输入端连至所述振荡器；
取样电阻R1与R2串联，其公共连接端与PWM产生模块的输入端连接，取样电阻R1的另一端连接电压检测1模块的输入端和外接电容C的上极板，取样电阻R2的另一端连接外接电容C的下极板，取样电阻R1与R2串联分压后产生的电压Vf与所述基准电压产生模块产生的电压Vref作为PWM产生模块的输入端；
逻辑控制1模块的第一输入端连接电压检测1模块的输出端，第二输入端连接PWM产生模块的输出端，第三输入端连接逻辑控制2模块的输出端；
逻辑控制1模块的第一输出端接在续流管NM2的栅极，第二输出端接在开关管PM1的栅极，第三输出端接到振荡器；
电压检测2模块的输入端连接外接电容C的上极板，输出端连接逻辑控制2模块的输入端，逻辑控制2模块的输出端连接整流管M1的栅极。
本实施例中的同步整流电路，采用电荷泵和Boost升压技术来代替传统的PWM驱动方式。其低压电荷泵+boost相结合的自驱动方式，不需要外部额外供电，同时加快给电容充电的速度，降低整流电路的占空比，降低平均导通压降，大大降低了应用复杂度，提高了应用范围。
本方案包括整流管M1、电荷泵、逻辑控制模块、电压检测模块、振荡器、PWM产生模块、基准电压产生模块、开关管PM1、续流管NM2、整流管M1、电感L、外接电容C和取样电阻R1，R2。逻辑控制1模块控制所述Boost模块的开关管PM1和续流管NM2的开关，逻辑控制2模块控制整流管M1的开关。
其工作过程如下：
(1)当整流管M1反向体二极管导通，低压电荷泵开始工作，外接电容C上电压为0，电荷泵在振荡器的驱动下使外接电容C上的电压逐渐上升，进行低压启动，设此阶段的工作时间为T1。
(2)当外接电容C上的电位到达到Boost模块的工作条件时，电压检测1模块输出控制信号，关闭低压电荷泵模块，同时启动Boost模块，继续给外接电容C升压，电压检测2模块检测外接电容C上的电压值，当外接电容C上电压值达到预设的上限值VH时，逻辑控制2模块打开整流管M1，同时关闭Boost模块，停止对外接电容C充电。设此阶段工作时间为T2
(3)该阶段，Boost模块和低压电荷泵模块停止工作，外接电容C的能量维持整流管M1导通，同时电压检测2模块检测外接电容C上的电压，当外接电容C上的电压下降到预设的下限值VL时，逻辑控制2模块关断整流管M1，此时低压电荷泵模块启动，对外接电容C继续充电升压。设此阶段的工作时间为T3。
(4)重复上述过程，依次循环，在整流管M1的源极S与漏极D之间形成占空比为m的方波。
设电流流过整流管M1的体二极管时，其源极S与漏极D之间的电压为VF，则平均电压
Figure PCTCN2017081385-appb-000001
需要说明的是，本实施例中的各器件在具体实现时可以采用不同型号的元件，本实施例在此不对其进行限制。可选的，开关管PM1可以为P型mos管或者PNP双极型晶体管；续流管NM2可以为N型mos管或者NPN双极型晶体管。再可选的，整流管M1可以为VDMOS或者LDMOS。
综上所述，本方案的同步整流电路采用低压电荷泵+Boost相结合的自 驱动方式，不需要外部额外供电，同时加快给电容充电的速度，降低整流电路的占空比，降低平均导通压降，大大降低了应用复杂度，提高了应用范围。
本领域普通技术人员可以理解：实现上述方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成，前述的程序可以存储于一计算机可读取存储介质中，该程序在执行时，执行包括上述方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (4)

  1. 一种同步整流电路，其特征在于，包括：低压电荷泵模块、Boost模块、外接电容C和整流管M1；
    其中，低压电荷泵模块由振荡器、电荷泵构成；
    Boost模块由逻辑控制1模块、逻辑控制2模块、电压检测1模块、电压检测2模块、PWM产生模块、基准电压产生模块、开关管PM1、续流管NM2、隔离管NM1、电感L、和取样电阻R1与R2构成；
    其中，隔离管NM1的漏极接整流管M1的漏极，源极接续流管NM2的源极、取样电阻R2的下端和外接电容C的下极板，栅极接整流管M1的源极和电感L的一端；开关管PM1的源极接振荡器、外接电容C的上极板、电压检测2模块的输入端，漏极接电感L的另一端和续流管NM2的漏极；
    外接电容C的上极板接电压检测1模块的输入端，所述电荷泵的输出端；
    所述电荷泵的输入端连至所述振荡器；
    取样电阻R1与R2串联，其公共连接端与PWM产生模块的输入端连接，取样电阻R1的另一端连接电压检测1模块的输入端和外接电容C的上极板，取样电阻R2的另一端连接外接电容C的下极板，取样电阻R1与R2串联分压后产生的电压Vf与所述基准电压产生模块产生的电压Vref作为PWM产生模块的输入端；
    逻辑控制1模块的第一输入端连接电压检测1模块的输出端，第二输入端连接PWM产生模块的输出端，第三输入端连接逻辑控制2模块的输出端；
    逻辑控制1模块的第一输出端接在续流管NM2的栅极，第二输出端接在开关管PM1的栅极，第三输出端接到振荡器；
    电压检测2模块的输入端连接外接电容C的上极板，输出端连接逻辑控制2模块的输入端，逻辑控制2模块的输出端连接整流管M1的栅极。
  2. 根据权利要求1所述的同步整流电路，其特征在于，
    所述逻辑控制1模块控制所述Boost模块的开关管PM1和续流管NM2的开关，所述逻辑控制2模块控制整流管M1的开关。
  3. 根据权利要求1所述的同步整流电路，其特征在于，
    开关管PM1为P型mos管或者PNP双极型晶体管；续流管NM2为N型mos管或者NPN双极型晶体管。
  4. 根据权利要求1所述的同步整流电路，其特征在于，
    所述整流管M1为VDMOS或者LDMOS。
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