WO2018205370A1 - 电源转换模块 - Google Patents

电源转换模块 Download PDF

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Publication number
WO2018205370A1
WO2018205370A1 PCT/CN2017/090541 CN2017090541W WO2018205370A1 WO 2018205370 A1 WO2018205370 A1 WO 2018205370A1 CN 2017090541 W CN2017090541 W CN 2017090541W WO 2018205370 A1 WO2018205370 A1 WO 2018205370A1
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Prior art keywords
circuit
signal
power conversion
primary
conversion module
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PCT/CN2017/090541
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English (en)
French (fr)
Inventor
谢先智
叶华
陈敏
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厦门赛特勒磁电有限公司
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Priority claimed from CN201710333732.6A external-priority patent/CN106972768A/zh
Application filed by 厦门赛特勒磁电有限公司 filed Critical 厦门赛特勒磁电有限公司
Publication of WO2018205370A1 publication Critical patent/WO2018205370A1/zh

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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
    • H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • 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
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only

Definitions

  • the invention relates to a switching power supply, in particular to a switching power conversion module capable of detecting a positive/negative phase zero crossing detection function of an alternating signal.
  • the earphone hearing limit of 20 kHz mainly represented by the self-excited oscillation switching power supply RCC (Ringing Choke convertor)
  • RCC Self-excited oscillation switching power supply
  • PWM Pulse Width Modulation
  • the switch circuit represents the third generation of switching power supply technology. This technology features that the switching state is close to the soft switch, so the power supply operating frequency can reach above MHz, the conversion efficiency is higher, the conversion power is further improved, the volume can be made smaller, and the quasi-resonance On the basis of technology, the real soft switching technology has made great progress and progress.
  • the representative technology is the LLC Half Bridge Resonant Convertor technology. From the history of power technology development, it can be seen that the future power supply technology will further develop towards integration, miniaturization, high frequency and diversified functions.
  • power modules are required for almost all electronic devices. Especially in many electronic and computer applications, power modules are required to provide high-quality stable voltage and maintain stable operation of the system. At the same time, in order to achieve the purpose of monitoring, controlling or adjusting the alternating signal, it is often necessary to synchronously detect the positive and negative half-cycle zero-crossing signals of the alternating signal. However, most power module applications do not have such a function. The specific reason is that for safety requirements and considerations, double safety insulation is required between the primary and secondary circuits of the power module. For details, see IEC60950-1 1.2.9. -1.2.10 regarding the safety requirements for insulation, it is not possible to directly sample and use the input high voltage signal. So far, there is no power module that can perform accurate voltage conversion, power transfer and impedance matching, as well as accurately detect the zero crossings of the rising and falling edges of the input alternating signal.
  • the invention provides a power conversion module, comprising:
  • a power conversion circuit connected to the alternating input terminal for implementing power transmission and voltage conversion
  • the signal sampling circuit is connected to the alternating input end for sampling the signal of the alternating input end and generating a sampling signal, and the sampling signal is in phase with the signal of the alternating input end, but the amplitude is reduced in proportion;
  • Detecting a modulation circuit connected to the signal sampling circuit, and the sampled signal is modulated by the detection modulation circuit to output a rectangular pulse signal;
  • An MCU controller connected to the detection modulation circuit
  • the signal isolation circuit is connected in series between the MCU controller and the detection modulation circuit, and the signal isolation circuit is used for isolating and processing the rectangular pulse signal, and the isolated rectangular pulse signal is used as an input signal to be sampled by the IO port of the MCU controller, and the MCU controller After receiving the rectangular pulse signal, after a series of logic operations, the corresponding command is output to drive the operation of the subsequent stage actuator, and the process is repeated to realize the monitoring, modulation and control of the input alternating signal;
  • a first working voltage circuit connected in series between the power conversion circuit and the detection modulation circuit for providing a working voltage to the detection modulation circuit
  • the second working voltage circuit is connected in series between the power conversion circuit and the signal isolation circuit for supplying the operating voltage to the signal isolation circuit.
  • the power conversion circuit is a flyback power conversion circuit, a forward power conversion circuit, a half bridge power conversion circuit, a full bridge power conversion circuit, or an LLC power conversion circuit.
  • the power conversion circuit is composed of a rectifier circuit, a storage filter capacitor, a high frequency transformer with primary and secondary isolation functions, and a power management circuit.
  • the rectifier circuit is a rectifier bridge composed of four diodes, and an input end of the rectifier bridge. Connected to the alternating input end, the output end of the rectifier bridge is connected with the high frequency transformer, and the energy storage filter capacitor is connected in parallel between the rectifier bridge and the high frequency transformer.
  • the power management circuit has a power management IC, and the high frequency transformer includes four in total.
  • the primary side of the high-frequency transformer is respectively provided with a primary main winding, a primary first winding and a primary second winding
  • the secondary side of the high-frequency transformer is provided with a secondary main winding
  • one end of the primary main winding is connected to the positive end of the output end of the rectifier bridge, and
  • One end is connected to the power management IC, one end of the primary first winding is grounded, the other end is connected to the power management IC through a second diode, and the primary first winding is connected to the anode end of the second diode, the second diode
  • the anode terminal is connected to the power management IC through a shunt resistor.
  • the signal sampling circuit can adopt a full-wave rectification circuit or a half-wave rectification circuit.
  • the signal sampling circuit is composed of a first diode and two current limiting resistors connected in series.
  • the anode end of the first diode is connected to the L line of the alternating input end, and the cathode end of the first diode passes through the phase.
  • Two shunt resistors are connected in series to ground, and the detection modulation circuit is connected between the two shunt resistors.
  • the working process of the detection modulation circuit is:
  • the sampling signal is at a level of 0, and the rectangular pulse signal is kept at a low level;
  • the sampled signal is at the 0 level and the rectangular pulse signal is held high.
  • the first working voltage circuit comprises a third diode and a current limiting resistor, the anode end of the third diode is connected to one end of the primary second winding, the other end of the primary second winding is grounded, and the cathode end of the third diode is in turn
  • the current limiting resistor and the signal isolation circuit are connected to the detection modulation circuit.
  • the signal isolation circuit has an active side and a response side, and the active side of the signal isolation circuit is respectively connected to the first working voltage circuit and the detection modulation circuit, and the response side of the signal isolation circuit is respectively connected with the second working voltage circuit and the MCU controller.
  • the signal isolation circuit is grounded by two shunt resistors connected in series, and the MCU controller is connected between the two shunt resistors.
  • the signal isolation circuit has an active side and a response side, and the active side of the signal isolation circuit is respectively connected with the first working voltage circuit and the detection modulation circuit, and the active side of the signal isolation circuit is respectively connected with the second working voltage circuit and the MCU controller,
  • the working voltage circuit is connected to the positive pole of the secondary main winding, the negative pole of the secondary main winding is grounded, and a storage filter capacitor is connected between the positive pole and the negative pole of the secondary main winding.
  • the detection modulation circuit uses an N-channel MOS transistor or an NPN-type transistor.
  • the signal isolation circuit is an optical coupler or a drive transformer of the same ratio.
  • the invention has the advantages of realizing power transmission and voltage conversion, and the zero-crossing detecting circuit can realize real-time synchronous zero-crossing detection of the input alternating high-voltage large signal, and synchronously output rectangular pulse wave, and the zero-crossing detecting circuit can realize alternating inputting The high voltage large signal and the output synchronous pulse low voltage small signal are safely isolated.
  • the invention solves the problem that the traditional circuit cannot synchronously monitor the zero-crossing point of the rising edge and the falling edge of the input alternating signal, and monitors the problem of safe isolation between the low-voltage small signal and the input alternating high-voltage large signal, and the present invention can realize the above functions and the overall cost. Low, safe and reliable.
  • FIG. 1 is a structural block diagram of a power conversion module provided by the present invention.
  • FIG. 2 is a circuit schematic diagram of the power conversion module shown in FIG. 1.
  • FIG. 3 is a phase diagram showing the phase relationship between the input alternating signal and the output zero-crossing detection signal in the power conversion module shown in FIG. 1.
  • FIG. 4 is a circuit schematic diagram of another power conversion module provided by the present invention.
  • the power conversion module includes a power conversion circuit B, a signal sampling circuit C, a detection modulation circuit E, an MCU controller H, a signal isolation circuit G, a first working voltage circuit D and a second working voltage circuit F.
  • the power conversion circuit B is connected to the alternating input terminal for power transmission and voltage conversion.
  • the signal sampling circuit C is connected to the alternating input terminal for sampling the signal of the alternating input terminal and generating a sampling signal.
  • the sampled signal is in phase with the signal at the alternating input, but the amplitude is scaled down.
  • the detection modulation circuit E is connected to the signal sampling circuit C.
  • the sampled signal is modulated by the detection modulation circuit E, and a rectangular pulse signal is output.
  • the MCU controller H is connected to the detection modulation circuit E.
  • the signal isolation circuit G is connected in series between the MCU controller and the detection modulation circuit E.
  • the signal isolation circuit G is used for isolating and processing the rectangular pulse signal, and the isolated rectangular pulse signal is used as an input signal to be sampled by the IO port of the MCU controller H.
  • the first operating voltage circuit D is connected in series between the power conversion circuit B and the detection modulation circuit E for supplying an operating voltage to the detection modulation circuit E.
  • the second working voltage circuit F is connected in series between the power conversion circuit B and the signal isolation circuit G for supplying an operating voltage to the signal isolation circuit G.
  • the power conversion circuit B may be a forward power conversion circuit, or may be a flyback power conversion circuit, a half bridge power conversion circuit, a full bridge power conversion circuit, or an LLC power conversion circuit.
  • the signal sampling circuit C can employ a full-wave rectification circuit or a half-wave rectification circuit.
  • the power conversion circuit B is a flyback power conversion circuit.
  • flyback power conversion circuit means that when the primary coil of the transformer is excited by the DC voltage, the secondary coil of the transformer does not provide power output to the load, but only provides the load to the load after the excitation voltage of the primary coil of the transformer is turned off. Power output.
  • the power conversion circuit B is composed of a rectifier circuit DB1, a storage filter capacitor EC1, a high frequency transformer T1 having primary and secondary isolation functions, and a power management circuit.
  • the rectifier circuit DB1 is a rectifier bridge composed of four diodes.
  • the input end of the rectifier bridge is connected to the alternating input end, and the output end of the rectifier bridge is connected to the high frequency transformer T1.
  • the energy storage filter capacitor EC1 is connected in parallel between the rectifier bridge and the high frequency transformer T1.
  • the power management circuit has a power management IC.
  • the high frequency transformer T1 includes a total of four windings.
  • the primary side of the high frequency transformer T1 is provided with a primary main winding NP, a primary first winding NVCC1 and a primary second winding NVCC2, respectively.
  • the secondary side winding NS is provided on the secondary side of the high frequency transformer T1.
  • One end of the primary main winding NS is connected to the positive terminal of the rectifier bridge, and the other end is connected to the SWD pin of the power management IC.
  • the primary first winding NVCC1 is grounded at one end, and the other end is connected to the SWD pin of the power management IC through a second diode D2 and a resistor R5.
  • the primary first winding NVCC1 is connected to the anode terminal of the second diode D2, and the anode end of the second diode is connected to the FB pin of the power management IC through a shunt resistor (R6, R7).
  • the CS pin of the power management IC is grounded through a resistor R3.
  • the signal sampling circuit C is composed of a first diode D1 and two current limiting resistors (R1, R2) connected in series.
  • the anode terminal of the first diode D1 is connected to the L line of the alternating input terminal, and the cathode terminal of the first diode D1 is grounded by two shunt resistors (R1, R2) connected in series.
  • the detection modulation circuit E is connected between two shunt resistors (R1, R2).
  • the detection modulation circuit E employs an N-channel MOS transistor Q1.
  • the detection modulation circuit E is also grounded via a transient diode ZD1.
  • the first operating voltage circuit D includes a third diode D3 and a current limiting resistor R4.
  • the anode end of the third diode D3 is connected to one end of the primary second winding NVCC2.
  • the other end of the primary second winding NVCC2 is grounded.
  • the cathode end of the third diode D3 is sequentially connected to the detection modulation circuit E via the current limiting resistor R4 and the signal isolation circuit G.
  • the signal isolation circuit G is an optical coupler PH1.
  • the optical coupler PH1 has an active side and a response side.
  • the active side of the photocoupler PH1 is connected to the first operating voltage circuit D and the detection modulation circuit E, respectively.
  • the response side of the photocoupler PH1 is connected to the second operating voltage circuit F and the MCU controller H, respectively.
  • the second working voltage circuit F is connected to the positive side of the secondary main winding NS through a resistor R8.
  • the secondary main winding NS is grounded at the negative pole.
  • a storage filter capacitor EC2 is also connected between the positive and negative poles of the secondary main winding NS.
  • the photocoupler PH1 response side is grounded through two shunt resistors (R9, R10) connected in series, and the MCU controller is connected between two shunt resistors (R9, R10).
  • the working process of detecting the modulation circuit E is:
  • the sampling signal is at a level of 0, and the rectangular pulse signal is kept at a low level;
  • the sampled signal is at the 0 level and the rectangular pulse signal is held high.
  • the MCU controller H After the MCU controller H receives the data IO port signal from the low level to the high level, after a series of logic operations, the corresponding command is output to drive the subsequent stage actuator operation. This process is repeated to realize the monitoring of the input alternating signal. , modulation and control.
  • the detection modulation circuit E can also employ an NPN type triode.
  • Embodiment 4 shows a power conversion module of another embodiment of the present invention. As shown in FIG. 4, the difference from Embodiment 1 is that the signal isolation circuit G is a drive transformer T2 of the same ratio.

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Abstract

一种电源转换模块，包括功率转换电路（B），信号取样电路（C），检测调制电路（E），MCU控制器（H），信号隔离电路（G），第一工作电压电路（D）和第二工作电压电路（F），该电源转换模块可实现功率传输和电压转换，过零点检测电路可以实现对输入交变高压大信号进行实时同步过零点检测，并同步输出矩形脉冲波，过零点检测电路可以实现对输入交变高压大信号和输出的同步脉冲低压小信号进行安全隔离。解决了传统电路无法同步监测输入交变信号的上升沿和下降沿的过零点，并且将监测低压小信号与输入交变高压大信号之间安全隔离的问题，且总体成本低，安全可靠。

Description

电源转换模块 技术领域
本发明涉及一种开关电源，具体涉及一种可以检测交变信号正负相位过零点检测功能的开关电源转换模块。
背景技术
随着开关电源技术的不断成熟和普及，其应用领域也越来越广，从1947年底晶体管问世，电源技术大约经历几个大的技术更新和换代，从20世纪60年代末开始，高耐压，大电源的双极型电子晶体管(亦称巨型晶体管，BJT、GTR)的出现，使得采用高工作频率的开关电源成为可能，在此阶段，工作在非典型开关状态的线性电源(Linear power supply)成为主流，得到广泛应用，但线性电源固有的体积大，质量重，效率低的缺点，促使真正意义上的第一代开关电源技术迅速发展，到20世纪70年代，开关频率终于突破了人耳听觉极限的20kHz,，主要以自激式振荡开关电源RCC(Ringing Choke convertor)为代表的第一代开关电源满足了市场的大部份需求，但分立元件固有的参数离散性，导致模块的性能稳定性和一致性受到很大局限，同时产品功率无法进一步提高，为了解决RCC电源技术的缺点，以脉宽调节技术PWM(Pulse Width Modulation)为核心的芯片集成技术的产生促进了第二代硬开关电源技术的迅速发展，此阶段，各种电源拓扑技术不断涌现，模块功率进一步提升，工作频率进一步提高，体积却进一步减少，稳定性也更好，到20世纪80年代，随着软开关技术的研究成果的不断突破，采用准谐振技术QR(quasi-resonant)为代表的零电压和零电流 开关电路代表了第三代开关电源技术，此技术特点为开关状态接近软开关，所以电源工作频率可以达到MHz以上，转换效率更高，转换功率进一步提升，体积可以做到更小，在准谐振技术基础上，真正的软开关技术取得长足发展和进步，其中代表性的技术为LLC谐振半桥(LLC Half Bridge Resonant Convertor)技术。从电源技术发展的历程可以看出，未来电源技术也会进一步向着集成化，小型化，高频化以及功能多样化方向发展。
从上面的电源技术的发展来看，几乎所有的电子设备都需用到电源模块，特别是现在许多电子和计算机应用系统中，不仅需要电源模块提供高质量的稳定电压，维持系统的稳定工作，同时为了实现交变信号的监测、控制或调节等目的，往往需要同步对交变信号进行正负半周过零点信号进行检测。但目前大部分电源模块应用都没有此种功能，具体原因在于出于安全要求和考虑，电源模块的初次和次级电路之间都需进行双重安全绝缘，具体要求可参见IEC60950-1 1.2.9-1.2.10中关于绝缘的安全要求，所以无法直接对输入交变的高压信号进行取样和使用。到目前为止，还没有一款电源模块，既能进行精确的电压转换，功率传输和阻抗匹配，同时还可以精确对输入交变信号的上升沿和下降沿的过零点进行检测
发明内容
本发明的目的是提供一种电源转换模块，具有可以检测交变信号正负相位过零点检测功能的特点。
本发明提供了一种电源转换模块，包括：
功率转换电路，与交变输入端相连接，用于实现功率传输和电压转换；
信号取样电路，与交变输入端相连接，用于对交变输入端的信号进行取样，并生成取样信号，取样信号与交变输入端的信号同相，但幅值同比例缩小；
检测调制电路，与信号取样电路相连接，取样信号经过检测调制电路调制后，输出矩形脉冲信号；
MCU控制器，与检测调制电路相连接；
信号隔离电路，串联在MCU控制器和检测调制电路之间，信号隔离电路用于隔离处理矩形脉冲信号，经隔离处理的矩形脉冲信号作为输入信号经MCU控制器的IO口进行采样，MCU控制器接收到矩形脉冲信号后，经过一系列逻辑运算，输出相应指令去驱动后级执行元件工作，此过程周而复始，实现对输入交变信号的监测，调制和控制；
第一工作电压电路，串联在功率转换电路与检测调制电路之间，用于向检测调制电路提供工作电压；
第二工作电压电路，串联在功率转换电路与信号隔离电路之间，用于向信号隔离电路提供工作电压。
该功率转换电路为反激功率转换电路、正激功率转换电路、半桥功率转换电路、全桥功率转换电路或者LLC功率转换电路。
该功率转换电路由一个整流电路、一个贮能滤波电容、一个具有初次和次级隔离功能的高频变压器和一个电源管理电路组成，整流电路为四个二极管组成的整流桥，整流桥的输入端与交变输入端相连接，整流桥的输出端与高频变压器相连接，贮能滤波电容并联于整流桥与高频变压器之间，电源管理电路具有一个电源管理IC，高频变压器总共包括四个绕组，高频变压器初级侧分别设有初级主绕组、初级第一绕组和初级第二绕组，高频变压器次级侧设有次级主绕组，初级主绕组一端接整流桥输出端正极，另一端与电源管理IC相连接，初级第一绕组一端接地，另一端通过一个第二二极管与电源管理IC相连接，初级第一绕组连接于第二二极管阳极端，第二二极管阳极端通过分流电阻与电源管理IC相连接。
该信号取样电路可以采用全波整流电路或者半波整流电路。
该信号取样电路由相串联的一个第一二极管和两个限流电阻组成，第一二极管的阳极端与交变输入端的L线相连接，第一二极管的阴极端通过相串联两个分流电阻接地，检测调制电路连接于两个分流电阻之间。
该检测调制电路的工作过程为：
当交变输入端的信号由正半周最大值向负半周最小值变化过程中，在经过零点时，矩形脉冲信号由高电平翻转到低电平；
当交变输入端的信号处于负半周时，取样信号为0电平，矩形脉冲信号低电平将保持；
当交变输入端的信号由负半周最小值向正半周最大值变化过程中，在经过零点时，矩形脉冲信号由低电平翻转到高电平；
当交变输入端的信号处于正半周时，取样信号为0电平，矩形脉冲信号高电平将保持。
该第一工作电压电路包括一个第三二极管和一个限流电阻，第三二极管阳极端与初级第二绕组一端连接，初级第二绕组另一端接地，第三二极管阴极端依次经过限流电阻和信号隔离电路与检测调制电路相连接。
该信号隔离电路具有主动侧和响应侧，信号隔离电路主动侧分别与第一工作电压电路和检测调制电路相连接，信号隔离电路响应侧分别与第二工作电压电路和MCU控制器相连接。
该信号隔离电路响应侧通过相串联的两个分流电阻接地，MCU控制器连接于两个分流电阻之间。
该信号隔离电路具有主动侧和响应侧，信号隔离电路主动侧分别与第一工作电压电路和检测调制电路相连接，信号隔离电路主动侧分别与第二工作电压电路和MCU控制器相连接，第二工作电压电路与次级主绕组正极相连接，次级主绕组负极接地，次级主绕组正极与负极之间还连接有一个贮能滤波电容。
该检测调制电路采用N沟道MOS管或者NPN型三极管。
该信号隔离电路为光耦合器或者同匝比的驱动变压器。
本发明的优点在于：实现功率传输和电压转换，过零点检测电路可以实现对输入交变高压大信号进行实时同步过零点检测，并同步输出矩形脉冲波，过零点检测电路可以实现对输入交变高压大信号和输出的同步脉冲低压小信号进行安全隔离。解决了传统电路无法同步监测输入交变信号的上升沿和下降沿的过零点，并且将监测低压小信号与输入交变高压大信号之间安全隔离的问题，本发明可以实现上述功能且总体成本低，安全可靠。
附图说明
图1为本发明提供的一种电源转换模块的结构框图。
图2为图1所示电源转换模块的电路原理图。
图3为图1所示电源转换模块中输入交变信号与输出过零点检测信号相位关系图。
图4为本发明提供的另一种电源转换模块的电路原理图。
具体实施方式
下面结合附图对本发明作进一步详细的说明。
实施例1
图1至图3显示的是本发明的一种电源转换模块。
如图1所示，该电源转换模块包括功率转换电路B，信号取样电路C，检测调制电路E，MCU控制器H，信号隔离电路G，第一工作电压电路D和第二工作电压电路F。
各个电路的结构关系为：
功率转换电路B与交变输入端相连接，用于实现功率传输和电压转换。
信号取样电路C与交变输入端相连接，用于对交变输入端的信号进行取样，并生成取样信号。取样信号与交变输入端的信号同相，但幅值同比例缩小。
检测调制电路E与信号取样电路C相连接。取样信号经过检测调制电路E调制后，输出矩形脉冲信号。
MCU控制器H与检测调制电路E相连接。
信号隔离电路G串联在MCU控制器和检测调制电路E之间。信号隔离电路G用于隔离处理矩形脉冲信号，经隔离处理的矩形脉冲信号作为输入信号经MCU控制器H的IO口进行采样。
第一工作电压电路D串联在功率转换电路B与检测调制电路E之间，用于向检测调制电路E提供工作电压。
第二工作电压电路F串联在功率转换电路B与信号隔离电路G之间，用于向信号隔离电路G提供工作电压。
该功率转换电路B可以为正激功率转换电路，也可以为反激功率转换电路、半桥功率转换电路、全桥功率转换电路或者LLC功率转换电路。
该信号取样电路C可以采用全波整流电路或者半波整流电路。
如图2所示，该功率转换电路B为反激功率转换电路。
所谓反激功率转换电路，是指当变压器的初级线圈正好被直流电压激励时，变压器的次级线圈没有向负载提供功率输出，而仅在变压器初级线圈的激励电压被关断后才向负载提供功率输出。
该功率转换电路B由一个整流电路DB1、一个贮能滤波电容EC1、一个具有初次和次级隔离功能的高频变压器T1和一个电源管理电路组成。
其中，整流电路DB1为四个二极管组成的整流桥。
整流桥的输入端与交变输入端相连接，整流桥的输出端与高频变压器T1相连接。
贮能滤波电容EC1并联于整流桥与高频变压器T1之间。
电源管理电路具有一个电源管理IC。
高频变压器T1总共包括四个绕组。
高频变压器T1初级侧分别设有初级主绕组NP、初级第一绕组NVCC1和初级第二绕组NVCC2。
高频变压器T1次级侧设有次级主绕组NS。
初级主绕组NS一端接整流桥输出端正极，另一端与电源管理IC的SWD引脚相连接。
初级第一绕组NVCC1一端接地，另一端通过一个第二二极管D2和电阻R5与电源管理IC的SWD引脚相连接。
初级第一绕组NVCC1连接于第二二极管D2阳极端，第二二极管阳极端通过分流电阻(R6，R7)与电源管理IC的FB引脚相连接。
电源管理IC的CS引脚通过一个电阻R3接地。
该信号取样电路C由相串联的一个第一二极管D1和两个限流电阻(R1，R2)组成。
第一二极管D1的阳极端与交变输入端的L线相连接，第一二极管D1的阴极端通过相串联两个分流电阻(R1，R2)接地。
检测调制电路E连接于两个分流电阻(R1，R2)之间。
该检测调制电路E采用的是N沟道MOS管Q1。
该检测调制电路E还通过一个瞬变二极管ZD1接地。
第一工作电压电路D包括一个第三二极管D3和一个限流电阻R4。
第三二极管D3阳极端与初级第二绕组NVCC2一端连接。
初级第二绕组NVCC2另一端接地。
第三二极管D3阴极端依次经过限流电阻R4和信号隔离电路G与检测调制电路E相连接。
该信号隔离电路G为光耦合器PH1。
光耦合器PH1具有主动侧和响应侧。
光耦合器PH1主动侧分别与第一工作电压电路D和检测调制电路E相连接。
光耦合器PH1响应侧分别与第二工作电压电路F和MCU控制器H相连接。
第二工作电压电路F通过电阻R8与次级主绕组NS正极相连接。
次级主绕组NS负极接地。
次级主绕组NS正极与负极之间还连接有一个贮能滤波电容EC2。
光耦合器PH1响应侧通过相串联的两个分流电阻(R9，R10)接地，MCU控制器连接于两个分流电阻(R9，R10)之间。
如图3所示，检测调制电路E的工作过程为：
当交变输入端的信号由正半周最大值向负半周最小值变化过程中，在经过零点时，矩形脉冲信号由高电平翻转到低电平；
当交变输入端的信号处于负半周时，取样信号为0电平，矩形脉冲信号低电平将保持；
当交变输入端的信号由负半周最小值向正半周最大值变化过程中，在经过零点时，矩形脉冲信号由低电平翻转到高电平；
当交变输入端的信号处于正半周时，取样信号为0电平，矩形脉冲信号高电平将保持。
MCU控制器H接收到数据IO口信号由低电平翻转到高电平后，经过一系列逻辑运算，输出相应指令去驱动后级执行元件工作，此过程周而复始，实现对输入交变信号的监测，调制和控制。
在其他的实施例中，检测调制电路E还可以采用NPN型三极管。
实施例2
图4显示的是本发明的另一种实施方式的电源转换模块。如图4所示，与实施例1的不同之处仅在于，该信号隔离电路G为同匝比的驱动变压器T2。
以上仅是本发明的优选实施方式，应当指出的是，上述优选实施方式不应视为对本发明的限制。对于本技术领域的普通技术人员来说，在不背离本发明的精神和范围内，还可以做出若干改进和变形应用，以进一步实现对后级电路的控制，这些应用也应视为本发明的保护范围，这里不再用实施例详述，本发明的保护范围应当以权利要求所限定的范围为准。

Claims (10)

  1. 电源转换模块，其特征在于，包括：
    功率转换电路，与交变输入端相连接，用于实现功率传输和电压转换；
    信号取样电路，与所述交变输入端相连接，用于对所述交变输入端的信号进行取样，并生成取样信号，所述取样信号与所述交变输入端的信号同相，但幅值同比例缩小；
    检测调制电路，与所述信号取样电路相连接，所述取样信号经过所述检测调制电路调制后，输出矩形脉冲信号；
    MCU控制器，与所述检测调制电路相连接；
    信号隔离电路，串联在所述MCU控制器和所述检测调制电路之间，所述信号隔离电路用于隔离处理所述矩形脉冲信号，经隔离处理的所述矩形脉冲信号作为输入信号经所述MCU控制器的IO口进行采样，所述MCU控制器接收到所述矩形脉冲信号后，经过一系列逻辑运算，输出相应指令去驱动后级执行元件工作，此过程周而复始，实现对输入交变信号的监测，调制和控制；
    第一工作电压电路，串联在所述功率转换电路与所述检测调制电路之间，用于向所述检测调制电路提供工作电压；
    第二工作电压电路，串联在所述功率转换电路与所述信号隔离电路之间，用于向所述信号隔离电路提供工作电压。
  2. 如权利要求1所述的电源转换模块，其特征在于，所述功率转换电路为反激功率转换电路、正激功率转换电路、半桥功率转换电路、全桥功率转换电路或者LLC功率转换电路。
  3. 如权利要求2所述的电源转换模块，其特征在于，所述功率转换电路由一个整流电路、一个贮能滤波电容、一个具有初次和次级隔离功能的高频变压器和一个电源管理电路组成，所述整流电路为四个二极管组成的整流桥，所述整流桥的输入端与所述交变输入端相连接，所述整流桥的输出端与所述高频变压器相连接，所述贮能滤波电容并联于所述整流桥与所述高频变压器之间，所述电源管理电路具有一个电源管理IC，所述高频变压器总共包括四个绕组，所述高频变压器初级侧分别设有初级主绕组、初级第一绕组和初级第二绕组，所述高频变压器次级侧设有次级主绕组，所述初级主绕组一端接所述整流桥输出端正极，另一端与所述电源管理IC相连接，所述初级第一绕组一端接地，另一端通过一个第二二极管与所述电源管理IC相连接，所述初级第一绕组连接于所述第二二极管阳极端，所述第二二极管阳极端通过分流电阻与所述电源管理IC相连接。
  4. 如权利要求1所述的电源转换模块，其特征在于，所述信号取样电路采用全波整流电路或者半波整流电路。
  5. 如权利要求4所述的电源转换模块，其特征在于，所述信号取样电路由相串联的一个第一二极管和两个限流电阻组成，所述第一二极管的阳极端与所述与交变输入端的L线相连接，所述第一二极管的阴极端通过相串联所述两个分流电阻接地，所述检测调制电路连接于两个所述分流电阻之间。
  6. 如权利要求1至5任一项所述的电源转换模块，其特征在于，所述检测调制电路的工作过程为：
    当所述交变输入端的信号由正半周最大值向负半周最小值变化过程 中，在经过零点时，所述矩形脉冲信号由高电平翻转到低电平；
    当所述交变输入端的信号处于负半周时，所述取样信号为0电平，所述矩形脉冲信号低电平将保持；
    当所述交变输入端的信号由负半周最小值向正半周最大值变化过程中，在经过零点时，所述矩形脉冲信号由低电平翻转到高电平；
    当所述交变输入端的信号处于正半周时，所述取样信号为0电平，所述矩形脉冲信号高电平将保持。
  7. 如权利要求1所述的电源转换模块，其特征在于，所述第一工作电压电路包括一个第三二极管和一个限流电阻，所述第三二极管阳极端与所述初级第二绕组一端连接，所述初级第二绕组另一端接地，所述第三二极管阴极端依次经过所述限流电阻和所述信号隔离电路与所述检测调制电路相连接。
  8. 如权利要求1所述的电源转换模块，其特征在于，所述信号隔离电路具有主动侧和响应侧，所述信号隔离电路主动侧分别与所述第一工作电压电路和所述检测调制电路相连接，所述信号隔离电路响应侧分别与所述第二工作电压电路和所述MCU控制器相连接。
  9. 如权利要求8所述的电源转换模块，其特征在于，所述信号隔离电路响应侧通过相串联的两个所述分流电阻接地，所述MCU控制器连接于两个所述分流电阻之间。
  10. 如权利要求3所述的电源转换模块，其特征在于，所述信号隔离电路具有主动侧和响应侧，所述信号隔离电路主动侧分别与所述第一工作 电压电路和所述检测调制电路相连接，所述信号隔离电路主动侧分别与所述第二工作电压电路和所述MCU控制器相连接，所述第二工作电压电路与所述次级主绕组正极相连接，所述次级主绕组负极接地，所述次级主绕组正极与负极之间还连接有一个贮能滤波电容。
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