WO2022036971A1 - 基于连续导通模式的反激式开关电源电路及控制方法 - Google Patents

基于连续导通模式的反激式开关电源电路及控制方法 Download PDF

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WO2022036971A1
WO2022036971A1 PCT/CN2020/138083 CN2020138083W WO2022036971A1 WO 2022036971 A1 WO2022036971 A1 WO 2022036971A1 CN 2020138083 W CN2020138083 W CN 2020138083W WO 2022036971 A1 WO2022036971 A1 WO 2022036971A1
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signal
timing
time
current control
module
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PCT/CN2020/138083
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French (fr)
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WO2022036971A9 (zh
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张�杰
朱敏
王福龙
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苏州力生美半导体有限公司
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Priority to US17/773,602 priority Critical patent/US11984809B2/en
Publication of WO2022036971A1 publication Critical patent/WO2022036971A1/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
    • 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
    • H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • 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
    • H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter

Definitions

  • the invention relates to a flyback switching power supply circuit and a control method based on a continuous conduction mode, and belongs to the technical field of flyback switching power supply control.
  • the flyback switching power supply has two operating modes, discontinuous conduction mode (DCM) and continuous conduction mode (CCM).
  • DCM discontinuous conduction mode
  • CCM continuous conduction mode
  • the constant current output design is simple and easy to implement, because the current on the coil will drop to 0 at the end of each cycle, so its average current output formula is:
  • n is the turns ratio of the primary coil to the secondary coil of the transformer
  • Ipk is the peak current of the primary coil
  • Tsec the conduction time of the secondary diode
  • Tsw the power switching cycle.
  • the purpose of the present invention is to provide a flyback switching power supply circuit and control method based on continuous conduction mode, which can make the output current constant without specifying the initial current of secondary coil conduction as a constant value, which is convenient and fast.
  • a flyback switching power supply circuit based on continuous conduction mode including a constant current control circuit, a sampling circuit and a peak current control circuit
  • the sampling circuit is used to sample the secondary side
  • the on-time of the coil is obtained to obtain the on-time duty cycle signal D_SEC
  • the on-time duty cycle signal D_SEC is sent to the constant current control circuit
  • the constant current control circuit receives the on-time duty cycle signal D_SEC
  • the duty cycle signal D_SEC enables the on-time duty cycle signal D_SEC and the preset reference voltage signal VREF to generate a CAC voltage signal
  • the constant current control circuit combines the CAC voltage signal with the peak current of the peak current control circuit
  • the control signal VCST is converted into a time signal, and the time signal is compared to output an adjustment signal CCOUT, the adjustment signal CCOUT is used to actively adjust the value of the peak current control signal VCST, so that the flyback switching power supply
  • the circuit outputs constant current
  • the current detection resistor connected to the primary coil outputs a VCS signal
  • the constant current control circuit includes:
  • a signal generation module for generating a CAC voltage signal from the on-time duty cycle signal D_SEC and the preset reference voltage signal VREF;
  • the first timing module when the VCS signal is equal to the CAC voltage signal, the first timing module is used to start outputting or stop outputting the first time signal t1;
  • the second timing module is used for outputting a second time signal t2;
  • the timing comparison module is used to compare the first time signal t1 and the second time signal t2, and according to the comparison result, determine whether to output the adjustment signal CCOUT to actively adjust the value of the peak current control signal VCST, so as to
  • the flyback switching power supply circuit is made to output a constant current.
  • the constant current control circuit further includes a delay module, the delay module is used to receive the adjustment signal CCOUT sent by the timing comparison module, determine whether the adjustment signal CCOUT continues to be at a high level, and according to the judgment result. To determine whether to output an overload protection signal PRO, the overload protection signal PRO is used to control the drive signal of the flyback switching power supply circuit to be turned off.
  • the present invention also provides a method for controlling a flyback switching power supply based on a continuous conduction mode, using the above-mentioned flyback switching power supply circuit based on a continuous conduction mode, and the method includes:
  • the sampling circuit is used to sample the on-time of the secondary coil to obtain the on-time duty cycle signal D_SEC, and send the on-time duty cycle signal D_SEC to the constant current control circuit;
  • the constant current control circuit receives the on-time duty cycle signal D_SEC, and enables the on-time duty cycle signal D_SEC and a preset reference voltage signal VREF to generate a CAC voltage signal;
  • the constant current control circuit then converts the CAC voltage signal and the peak current control signal VCST of the peak current control circuit into a time signal, and compares the time signal to output a regulation signal CCOUT, the regulation signal CCOUT It is used to actively adjust the value of the peak current control signal VCST, so that the flyback switching power supply circuit outputs a constant current.
  • the current detection resistor connected to the primary coil outputs a VCS signal
  • the constant current control circuit includes a signal generation module, a first timing module, a second timing module, and a timing comparison module.
  • the signal generating module is used for generating a CAC voltage signal from the on-time duty cycle signal D_SEC and the preset reference voltage signal VREF;
  • the first timing module and the second timing module start timing at the same time, and output the first timing signal t1 and the second timing signal t2, and the VCS signal rises;
  • the first timing module stops timing
  • the second timing module stops timing, and the timing comparison module compares the first time signal t1 with the second time signal t2;
  • the second time signal t2 is greater than twice the first time signal t1, and the timing comparison module outputs an adjustment signal CCOUT, and the adjustment signal CCOUT is at a high level to control the peak current control circuit to reduce the value of the peak current control signal VCST , so that the continuous conduction mode-based flyback switching power supply circuit outputs a constant current.
  • the current detection resistor connected to the primary coil outputs a VCS signal
  • the constant current control circuit includes a signal generation module, a first timing module, a second timing module, and a timing comparison module.
  • the signal generating module is used for generating a CAC voltage signal from the on-time duty cycle signal D_SEC and the preset reference voltage signal VREF;
  • the second timing module starts timing to output a second timing signal t2, and the VCS signal rises;
  • the first timing module starts timing to output a first timing signal t1;
  • the timing comparison module compares the first time signal t1 and the second time signal t2;
  • the second time signal t2 is less than twice the first time signal t1, the timing comparison module outputs an adjustment signal CCOUT, and the adjustment signal CCOUT is at a high level to control the peak current control circuit to reduce the value of the peak current control signal VCST , so that the continuous conduction mode-based flyback switching power supply circuit outputs a constant current.
  • the average current output by the flyback switching power supply circuit based on the continuous conduction mode is:
  • RCS is the resistance value of the current detection resistor
  • n is the turns ratio of the primary coil and the secondary coil.
  • the constant current control circuit also includes a delay module
  • the delay module receives the adjustment signal CCOUT sent by the timing comparison module, determines whether the adjustment signal CCOUT continues to be at a high level, and determines whether to output the overload protection signal PRO according to the judgment result, and the overload protection signal PRO is used for The drive signal of the flyback switching power supply circuit is controlled to be turned off.
  • the beneficial effect of the present invention is that: by being provided with a constant current control circuit, it receives the on-time duty cycle signal D_SEC sent by sampling the secondary coil by the sampling circuit, and compares the on-time duty cycle signal D_SEC with a preset reference voltage
  • the signal VREF generates a CAC voltage signal, so that the constant current control circuit adjusts the voltage value of the VCS signal, thereby enabling the flyback switching power supply circuit to output a constant current, which is convenient and fast.
  • FIG. 1 is a circuit diagram of a flyback switching power supply circuit based on a continuous conduction mode of the present invention.
  • FIG. 2 is a schematic diagram of some modules in FIG. 1 .
  • FIG. 3 is a signal waveform diagram of the flyback switching power supply circuit based on the continuous conduction mode of the present invention.
  • FIG. 4 is another signal waveform diagram of the flyback switching power supply circuit based on the continuous conduction mode of the present invention.
  • a flyback switching power supply circuit based on continuous conduction mode in a preferred embodiment of the present invention includes a power supply circuit (POWER), a transformer connected to the power supply circuit, and a power supply circuit for the transformer.
  • a sampling circuit (SAMP) for sampling the secondary coil of the secondary side, a constant current control circuit (CC) and a driving circuit connected to the sampling circuit, and a power tube Q1 for controlling the turn-on or turn-off of the secondary coil
  • the transformer further includes a primary coil and an auxiliary coil, the primary coil, the auxiliary coil and the secondary coil have mutual inductance, the secondary coil is connected to the secondary diode D2, and the auxiliary coil is connected to the control circuit , the primary coil is connected to the current detection resistor RCS and the source of the power transistor Q1.
  • EA error amplifier
  • OSC oscillation module
  • CS peak current control module
  • CMP comparator
  • DRFF D flip-flop
  • the coil is turned on, the sampling circuit is used to sample the on-time of the secondary coil to obtain the on-time duty cycle signal D_SEC, and send the on-time duty cycle signal D_SEC to the constant current control circuit
  • the constant current control circuit receives the on-time duty cycle signal D_SEC, so that the on-time duty cycle signal D_SEC and the preset reference voltage signal VREF generate a CAC voltage signal, the constant current control circuit will
  • the CAC voltage signal and the peak current control signal VCST of the peak current control circuit are converted into a time signal, and the time signal is compared to output an adjustment signal CCOUT, the adjustment signal CCOUT is used to actively adjust the peak current
  • the value of the control signal VCST is controlled to
  • the constant current control circuit includes a signal generation module 3 , a first timing module 1 , a second timing module 2 and a timing comparison module 4 , and the signal generation module 3 is used to generate the on-time duty cycle signal D_SEC and a preset reference voltage signal VREF to generate a CAC voltage signal;
  • the first timing module 1 is used for receiving the CAC voltage signal and the VCS signal, when the voltage value of the CAC voltage signal is equal to the voltage value of the VCS signal , the first timing module 1 works to start outputting or stop outputting the first time signal t1;
  • the second timing module 2 is used to output the second time signal t2, and the timing comparison module is used to compare the first time signal t1 It is compared with the second time signal t2, and according to the comparison result, it is judged whether to output the adjustment signal CCOUT to control the peak current control circuit to output a constant current.
  • the constant current control circuit further includes a delay module 5, the delay module 5 is used to receive the adjustment signal CCOUT sent by the timing comparison module to output an overload protection signal PRO, and the overload protection signal PRO is used to control the The switching power supply drive signal is turned off.
  • the logic AND gate module is used to receive the PRO signal and output a low level, and the D flip-flop is triggered by the low level of the logic AND gate module, and drives the power transistor to turn off.
  • the present invention also provides a method for controlling a flyback switching power supply based on a continuous conduction mode, using the above-mentioned flyback switching power supply circuit based on a continuous conduction mode, and the method includes:
  • the sampling circuit is used to sample the on-time duty cycle signal D_SEC of the secondary coil, and send the on-time duty cycle signal D_SEC to the constant current control circuit;
  • the constant current control circuit receives the on-time duty cycle signal D_SEC, and enables the on-time duty cycle signal D_SEC and a preset reference voltage signal VREF to generate a CAC voltage signal;
  • the CAC voltage signal controls the constant current control circuit to output an adjustment signal CCOUT, and the adjustment signal CCOUT is used to actively adjust the value of the peak current control signal VCST, so that the flyback switching power supply circuit outputs a constant current.
  • the signal generation module 3 when the primary coil is turned on, the signal generation module 3 is used to generate a CAC voltage signal from the on-time duty cycle signal D_SEC and the preset reference voltage signal VREF;
  • the first timing module 1 and the second timing module 2 start timing at the same time, and output the first timing signal t1 and the second timing signal t2.
  • the VCS signal rises;
  • the VCS signal When the voltage of the CAC voltage signal is equal, the first timing module 1 stops timing; when the secondary coil is turned on, the second timing module 2 stops timing, and the timing comparison module compares the first time signal.
  • t1 is compared with the second time signal t2; the second time signal t2 is greater than twice the first time signal t1, and the timing comparison module outputs the adjustment signal CCOUT to control the peak current control circuit output VCST to decrease, thereby making all
  • the described flyback switching power supply circuit based on continuous conduction mode outputs constant current. That is, t2>2 ⁇ t1, the output adjustment signal CCOUT controls the VCST signal to decrease; if the second time signal t2 is less than twice the first time signal t1, that is, t2 ⁇ 2 ⁇ t1, then the output adjustment signal CCOUT will not act , that is, the VCST signal does not change.
  • the signal generation module 3 is used to generate a CAC voltage signal from the on-time duty cycle signal D_SEC and the preset reference voltage signal VREF; the primary coil is turned on When the second timing module 2 starts timing to output the second timing signal t2, the VCS signal rises; when the voltage of the VCS signal and the CAC voltage signal are equal, the first timing module 1 starts timing to Output the first timing signal t1; when the secondary coil is turned on, the first timing module 1 and the second timing module 2 stop timing, and the timing comparison module uses the first time signal t1 and the second time signal t2.
  • the timing comparison module outputs the adjustment signal CCOUT to control the peak current control circuit output VCST to decrease, and then makes the continuous conduction mode-based inverter
  • the excitation switching power supply circuit outputs a constant current. That is, t2 ⁇ 2 ⁇ t1, the output adjustment signal CCOUT controls the VCST signal to decrease; if the second time signal t2 is greater than twice the first time signal t1, that is, t2>2 ⁇ t1, the output adjustment signal CCOUT will not act , that is, the VCST signal does not change.
  • the average current output by the flyback switching power supply circuit based on the continuous conduction mode is:
  • RCS is the resistance value of the current detection resistor
  • n is the turns ratio of the primary coil and the secondary coil.
  • the constant current control circuit further includes a delay module 5, the delay module 5 receives the adjustment signal CCOUT sent by the timing comparison module, determines whether the adjustment signal CCOUT continues to be at a high level, and determines whether or not according to the judgment result.
  • a PRO signal is output, and the PRO signal is used to control the drive signal of the flyback switching power supply circuit to be turned off.
  • the second timing module 2 starts timing. At this time, the voltage value of the VCS signal continues to rise.
  • the second timing module 2 starts timing, and the first timing module 1 also starts timing. At this time, the voltage value of the VCS signal continues to rise.
  • the first timing module 1 stops timing.
  • the second timing module 2 also stops timing, and the timing comparison module 4 compares the first time signal t1 with the second time signal t2. If the second time signal t2 is greater than twice the first time signal t1, That is, t2>2 ⁇ t1;
  • the timing comparison module 4 outputs the adjustment signal CCOUT signal to the delay module 5.
  • the constant current control circuit receives the on-time duty cycle signal D_SEC sent by the sampling circuit sampling the secondary coil, and compares the on-time duty cycle signal D_SEC with the preset reference voltage signal VREF
  • the CAC voltage signal is generated, so that the constant current control circuit adjusts the voltage value of the VCST signal, so that the flyback switching power supply circuit outputs a constant current in the CCM mode, which is convenient and fast.

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Abstract

本申请涉及一种基于连续导通模式的反激式开关电源电路及控制方法，包括恒流控制电路、采样电路及峰值电流控制电路，采样电路用以采样副边线圈的导通时间以得到导通时间占空比信号D_SEC，并将导通时间占空比信号D_SEC发送至恒流控制电路，恒流控制电路接收导通时间占空比信号D_SEC，使得导通时间占空比信号D_SEC与预设参考电压信号VREF生成CAC电压信号，恒流控制电路将CAC电压信号与峰值电流控制电路的峰值电流控制信号VCST转换成时间信号，并对时间信号作比对处理以输出调节信号CCOUT，调节信号CCOUT用以主动调节峰值电流控制信号VCST的值，以使得反激式开关电源电路输出恒流，其无需规定副边线圈导通的起始电流为定值，即可使得输出电流恒定，方便快捷。

Description

基于连续导通模式的反激式开关电源电路及控制方法
本申请要求了申请日为2020年08月17日，申请号为202010827437.8的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及一种基于连续导通模式的反激式开关电源电路及控制方法，属于反激式开关电源控制技术领域。
背景技术
目前反激式开关电源有两种工作模式，非连续导通模式(DCM)和连续导通模式(CCM)。当反激式开关电源工作在DCM模式下，恒流输出设计简单，方便实现，因为每个周期结束时线圈上的电流都会降为0，因此其平均电流输出公式为：
Figure PCTCN2020138083-appb-000001
其中n为变压器的原边线圈与副边线圈匝数比，Ipk为原边线圈峰值电流，Tsec为副边二极管的导通时间，Tsw为电源开关周期，由公式可知，只需确定峰值电流以及副边线圈导通时间占空比，就能实现恒流输出；但是当反激式开关电源工作在CCM模式下，因为每个周期结束时，线圈上的电流都不为0，因此其平均电流输出公式为：
Figure PCTCN2020138083-appb-000002
Figure PCTCN2020138083-appb-000003
其中I1为副边线圈导通时的起始电流。由于I1在不同周期的值不同，因此较难控制CCM模式下的恒流输出。
发明内容
本发明的目的在于提供一种基于连续导通模式的反激式开关电源电路及控制方法，其无需规定副边线圈导通的起始电流为定值，即可使得输出电流恒定，方便快捷。
为达到上述目的，本发明提供如下技术方案：一种基于连续导通模式的反激式开关电源电路，包括恒流控制电路、采样电路及峰值电流控制电路，所述采样电路用以采样副边线圈的导通时间以得到导通时间占空比信号D_SEC，并将所述导通时间占空比信号D_SEC发送至所述恒流控制电路，所述恒流控制电路接收所述导通时间占空比信号D_SEC，使得所述导通时间占空比信号D_SEC与预设参考电压信号VREF生成CAC电压信号，所述恒流控制电路将所述CAC电压信 号与所述峰值电流控制电路的峰值电流控制信号VCST转换成时间信号，并对所述时间信号作比对处理以输出调节信号CCOUT，所述调节信号CCOUT用以主动调节峰值电流控制信号VCST的值，以使得所述反激式开关电源电路输出恒流。
进一步地，原边线圈导通时，与所述原边线圈连接的电流检测电阻输出VCS信号，所述恒流控制电路包括：
信号生成模块，所述信号生成模块用以将所述导通时间占空比信号D_SEC与预设参考电压信号VREF生成CAC电压信号；
第一计时模块，当所述VCS信号与CAC电压信号相等时，所述第一计时模块用以开始输出或停止输出第一时间信号t1；
第二计时模块，所述第二计时模块用以输出第二时间信号t2；
计时比较模块，所述计时比较模块用以将第一时间信号t1和第二时间信号t2作比对，并根据比对结果判断是否输出调节信号CCOUT以主动调节峰值电流控制信号VCST的值，以使得所述反激式开关电源电路输出恒流。
进一步地，所述恒流控制电路还包括延时模块，所述延时模块用以接收所述计时比较模块发送的调节信号CCOUT，判断所述调节信号CCOUT是否持续高电平，并根据判断结果以确定是否输出过载保护信号PRO，所述过载保护信号PRO用以控制所述反激式开关电源电路驱动信号关断。
本发明还提供了一种基于连续导通模式的反激式开关电源控制方法，采用如上所述的基于连续导通模式的反激式开关电源电路，所述方法包括：
采样电路用以采样副边线圈的导通时间以得到导通时间占空比信号D_SEC，并将所述导通时间占空比信号D_SEC发送至恒流控制电路；
所述恒流控制电路接收所述导通时间占空比信号D_SEC，并使得所述导通时间占空比信号D_SEC与预设参考电压信号VREF生成CAC电压信号；
所述恒流控制电路再将所述CAC电压信号与所述峰值电流控制电路的峰值电流控制信号VCST转换成时间信号，并对所述时间信号做对比以输出调节信号CCOUT，所述调节信号CCOUT用以主动调节峰值电流控制信号VCST的值，以使得所述反激式开关电源电路输出恒流。
进一步地，原边线圈导通时，与所述原边线圈连接的电流检测电阻输出VCS信号，所述恒流控制电路包括信号生成模块、第一计时模块、第二计时模块、及计时比较模块；
所述信号生成模块用以将所述导通时间占空比信号D_SEC与预设参考电压信号VREF生成CAC电压信号；
原边线圈导通时，所述第一计时模块和第二计时模块同时开始计时，并输出第一计时信号t1和第二计时信号t2，所述VCS信号上升；
所述VCS信号与所述CAC电压信号的电压相等时，所述第一计时模块停止计时；
原边线圈关断时，所述第二计时模块停止计时，所述计时比较模块将所述第一时间信号t1和第二时间信号t2作比对；
所述第二时间信号t2大于两倍的第一时间信号t1，所述计时比较模块输出调节信号CCOUT，所述调节信号CCOUT为高电平以控制峰值电流控制电路降低峰值电流控制信号VCST的值，继而使得所述基于连续导通模式的反激式开关电源电路输出恒定电流。
进一步地，原边线圈导通时，与所述原边线圈连接的电流检测电阻输出VCS信号，所述恒流控制电路包括信号生成模块、第一计时模块、第二计时模块、及计时比较模块；
所述信号生成模块用以将所述导通时间占空比信号D_SEC与预设参考电压信号VREF生成CAC电压信号；
原边线圈导通时，所述第二计时模块开始计时以输出第二计时信号t2，所述VCS信号上升；
所述VCS信号与所述CAC电压信号的电压相等时，所述第一计时模块开始计时以输出第一计时信号t1；
原边线圈关断时，所述第一计时模块和第二计时模块停止计时，所述计时比较模块将所述第一时间信号t1和第二时间信号t2作比对；
所述第二时间信号t2小于两倍的第一时间信号t1，所述计时比较模块输出调节信号CCOUT，所述调节信号CCOUT为高电平以控制峰值电流控制电路降低峰值电流控制信号VCST的值，继而使得所述基于连续导通模式的反激式开关电源电路输出恒定电流。
进一步地，当所述第二时间信号t2等于两倍的第一时间信号t1时，所述基于连续导通模式的反激式开关电源电路输出的平均电流为：
Figure PCTCN2020138083-appb-000004
其中，RCS为电流检测电阻的阻值，n为原边线圈和副边线圈的匝数比。
进一步地，所述恒流控制电路还包括延时模块，
所述延时模块接收所述计时比较模块发送的调节信号CCOUT，判断所述调节信号CCOUT是否持续高电平，并根据判断结果以确定是否输出过载保护信号PRO，所述过载保护信号PRO用以控制所述反激式开关电源电路驱动信号关断。
本发明的有益效果在于：通过设置有恒流控制电路，其接收采样电路对副边线圈采样而发送的导通时间占空比信号D_SEC，并将导通时间占空比信号D_SEC与预设参考电压信号VREF生成CAC电压信号，以使得恒流控制电路调节VCS信号的电压值，进而使得反激式开关电源电路输出恒流，方便快捷。
上述说明仅是本发明技术方案的概述，为了能够更清楚了解本发明的技术手段，并可依照说明书的内容予以实施，以下以本发明的较佳实施例并配合附图详细说明如后。
附图说明
图1为本发明的基于连续导通模式的反激式开关电源电路的电路图。
图2为图1中部分模块原理图。
图3为本发明的基于连续导通模式的反激式开关电源电路的信号波形图。
图4为本发明的基于连续导通模式的反激式开关电源电路的另一信号波形图。
具体实施方式
下面结合附图和实施例，对本发明的具体实施方式作进一步详细描述。以下实施例用于说明本发明，但不用来限制本发明的范围。
请参见图1，本发明的一较佳实施例中的一种基于连续导通模式的反激式开关电源电路，包括电源电路(POWER)、与所述电源电路连接的变压器、对所述变压器的副边线圈进行采样的采样电路(SAMP)、与所述采样电路连接的恒流控制电路(CC)及驱动电路、及用以控制所述副边线圈导通或关断的功率管Q1，其中，所述变压器还包括原边线圈和辅助线圈，所述原边线圈、辅助线圈与所述副边线圈互感，所述副边线圈接入副边二极管D2，所述辅助线圈接入控制电路，所述原边线圈接入电流检测电阻RCS及功率管Q1的源极。
其中，所述驱动电路包括误差放大器(EA)、振荡模块(OSC)、峰值电流控制模块(CS)、比较器(CMP)、逻辑与门模块、D触发器(DRFF)及驱动模块，当PWM＝1，功率管Q1打开，原边线圈导通，RCS电阻开始电流流过，该电流随时间增长而增大，进而使得VCS电压随时间上升；当VCS电压上升至VCST电压时，到达原边线圈的峰值电流，比较器CMP产生低电平信号到逻辑与门电路，逻辑与门电路输出低电平信号到D触发器使其复位，并输出PWM＝0，功率管Q1关断，副边线圈导通，所述采样电路用以采样所述副边线圈的导通时间以得到导通时间占空比信号D_SEC，并将所述导通时间占空比信号D_SEC发送至所述恒流控制电路，所述恒流控制电路接收所述导通时间占空比信号D_SEC，使得所述导通时间占空比信号D_SEC与预设参考电压信号VREF生成CAC电压信号，所述恒流控制电路将所述CAC电压信号与所述峰值电流控制电路的峰值电流控制信号VCST转换成时间信号，并对所述时间信号作比对处理以输出调节信号CCOUT，所述调节信号CCOUT用以主动调节峰值电流控制信号VCST的值，从而为负载提供稳定电压或电流，直到下个周期PWM＝1，功率管Q1再次开启。在本实施例中，VCST为原边线圈峰值电流控制电压，其中，D_SEC＝TSEC/TSW，CAC＝VREF/D_SEC。
具体的，恒流控制电路包括信号生成模块3、第一计时模块1、第二计时模块2及计时比对模块4，所述信号生成模块3用以将所述导通时间占空比信号 D_SEC与预设参考电压信号VREF生成CAC电压信号；所述第一计时模块1用以接收所述CAC电压信号及VCS信号，当所述CAC电压信号的电压值与所述VCS信号的电压值相等时，所述第一计时模块1工作以开始输出或停止输出第一时间信号t1；所述第二计时模块2用以输出第二时间信号t2，所述计时比较模块用以将第一时间信号t1和第二时间信号t2作比对，并根据比对结果判断是否输出调节信号CCOUT以控制峰值电流控制电路输出恒定电流。
所述恒流控制电路还包括延时模块5，所述延时模块5用以接收所述计时比较模块发送的调节信号CCOUT以输出过载保护信号PRO，所述过载保护信号PRO用以控制所述开关电源驱动信号关断。其中，所述逻辑与门模块用以接收所述PRO信号并输出低电平，所述D触发器由所述逻辑与门模块的低电平触发，并向驱动所述功率管关断。
本发明还提供了一种基于连续导通模式的反激式开关电源控制方法，采用如上所述的基于连续导通模式的反激式开关电源电路，所述方法包括：
采样电路用以采样副边线圈的导通时间占空比信号D_SEC，并将所述导通时间占空比信号D_SEC发送至恒流控制电路；
所述恒流控制电路接收所述导通时间占空比信号D_SEC，并使得所述导通时间占空比信号D_SEC与预设参考电压信号VREF生成CAC电压信号；
所述CAC电压信号控制所述恒流控制电路输出调节信号CCOUT，所述调节信号CCOUT用以主动调节峰值电流控制信号VCST的值，以使得所述反激式开关电源电路输出恒流。
具体的，请结合图2及图4，当原边线圈导通时，所述信号生成模块3用以将所述导通时间占空比信号D_SEC与预设参考电压信号VREF生成CAC电压信号；原边线圈导通时，所述第一计时模块1和第二计时模块2同时开始计时，并输出第一计时信号t1和第二计时信号t2，此时所述VCS信号上升；所述VCS信号与所述CAC电压信号的电压相等时，所述第一计时模块1停止计时；副边线圈导通时，所述第二计时模块2停止计时，所述计时比较模块将所述第一时间信号t1和第二时间信号t2作比对；所述第二时间信号t2大于两倍的第一时间信 号t1，所述计时比较模块输出调节信号CCOUT以控制峰值电流控制电路输出VCST降低，继而使得所述基于连续导通模式的反激式开关电源电路输出恒定电流。即t2＞2×t1，则其输出调节信号CCOUT控制VCST信号降低；若第二时间信号t2小于两倍的第一时间信号t1，即t2＜2×t1，则其输出调节信号CCOUT将不动作，即VCST信号不变。
请结合图2及图3，在其他实施例中，所述信号生成模块3用以将所述导通时间占空比信号D_SEC与预设参考电压信号VREF生成CAC电压信号；原边线圈导通时，所述第二计时模块2开始计时以输出第二计时信号t2，所述VCS信号上升；所述VCS信号与所述CAC电压信号的电压相等时，所述第一计时模块1开始计时以输出第一计时信号t1；副边线圈导通时，所述第一计时模块1和第二计时模块2停止计时，所述计时比较模块将所述第一时间信号t1和第二时间信号t2作比对；所述第二时间信号t2小于两倍的第一时间信号t1，所述计时比较模块输出调节信号CCOUT以控制峰值电流控制电路输出VCST降低，继而使得所述基于连续导通模式的反激式开关电源电路输出恒定电流。即t2＜2×t1，则其输出调节信号CCOUT控制VCST信号降低；若第二时间信号t2大于两倍的第一时间信号t1，即t2＞2×t1，则其输出调节信号CCOUT将不动作，即VCST信号不变。
当所述第二时间信号t2等于两倍的第一时间信号t1时，所述基于连续导通模式的反激式开关电源电路输出的平均电流为：
Figure PCTCN2020138083-appb-000005
其中，RCS为电流检测电阻的阻值，n为原边线圈和副边线圈的匝数比。
由上述公式可知，由于预设电压VREF及RCS电阻均为定值，因此输出恒流。
所述恒流控制电路还包括延时模块5，所述延时模块5接收所述计时比较模块发送的调节信号CCOUT，判断所述调节信号CCOUT是否持续高电平，并根据判断结果以确定是否输出PRO信号，所述PRO信号用以控制所述反激式开关电源电路驱动信号关断。
具体的，如图2所示，当原边线圈导通，即SW＝1时，第二计时模块2开始计时，此时VCS信号的电压值不断上升，当VCS信号的电压值上升至预设的CAC电压信号的电压值后，第一计时模块1也开始计时，直到SW信号＝0，第一计时模块1与第二计时模块2同时停止计时，计时比对模块4将第一时间信号t1和第二时间信号t2进行比较，若第二时间信号t2小于两倍的第一时间信号t1，即t2＜2×t1时；
或者，当原边线圈导通，即SW＝1时，第二计时模块2开始计时，同时第一计时模块1也开始计时，此时VCS信号的电压值不断上升，当VCS信号的电压值上升至预设的CAC电压信号的电压值后，第一计时模块1停止计时。当SW＝0，第二计时模块2也停止计时，计时比对模块4将第一时间信号t1和第二时间信号t2进行比较，若第二时间信号t2大于两倍的第一时间信号t1，即t2＞2×t1；
在上述两种情况下，计时比对模块4输出调节信号CCOUT信号到延时模块5，当调节信号CCOUT持续多个周期输出都为高，则延时模块5输出PRO信号到逻辑与门模块中。PRO＝0，D触发器输出PWM＝0，功率管Q1被关断，开关电源处于保护状态。
综上所述：通过设置有恒流控制电路，其接收采样电路对副边线圈采样而发送的导通时间占空比信号D_SEC，并将导通时间占空比信号D_SEC与预设参考电压信号VREF生成CAC电压信号，以使得恒流控制电路调节VCST信号的电压值，进而使得反激式开关电源电路在CCM模式下输出恒流，方便快捷。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (8)

  1. 一种基于连续导通模式的反激式开关电源电路，其特征在于，包括恒流控制电路、采样电路及峰值电流控制电路，所述采样电路用以采样副边线圈的导通时间以得到导通时间占空比信号D_SEC，并将所述导通时间占空比信号D_SEC发送至所述恒流控制电路，所述恒流控制电路接收所述导通时间占空比信号D_SEC，使得所述导通时间占空比信号D_SEC与预设参考电压信号VREF生成CAC电压信号，所述恒流控制电路将所述CAC电压信号与所述峰值电流控制电路的峰值电流控制信号VCST转换成时间信号，并对所述时间信号作比对处理以输出调节信号CCOUT，所述调节信号CCOUT用以主动调节峰值电流控制信号VCST的值，以使得所述反激式开关电源电路输出恒流。
  2. 如权利要求1所述的基于连续导通模式的反激式开关电源电路，其特征在于，原边线圈导通时，与所述原边线圈连接的电流检测电阻输出VCS信号，所述恒流控制电路包括：
    信号生成模块，所述信号生成模块用以将所述导通时间占空比信号D_SEC与预设参考电压信号VREF生成CAC电压信号；
    第一计时模块，当所述VCS信号与CAC电压信号相等时，所述第一计时模块用以开始输出或停止输出第一时间信号t1；
    第二计时模块，所述第二计时模块用以输出第二时间信号t2；
    计时比较模块，所述计时比较模块用以将第一时间信号t1和第二时间信号t2作比对，并根据比对结果判断是否输出调节信号CCOUT以主动调节峰值电流控制信号VCST的值，以使得所述反激式开关电源电路输出恒流。
  3. 如权利要求2所述的基于连续导通模式的反激式开关电源电路，其特征在于，所述恒流控制电路还包括延时模块，所述延时模块用以接收所述计时比较模块发送的调节信号CCOUT，判断所述调节信号CCOUT是否持续高电平，并根据判断结果以确定是否输出过载保护信号PRO，所述过载保护信号PRO用以控制所述反激式开关电源电路驱动信号关断。
  4. 一种基于连续导通模式的反激式开关电源控制方法，其特征在于，采用如权利要求1所述的基于连续导通模式的反激式开关电源电路，所述方法包括：
    采样电路用以采样副边线圈的导通时间以得到导通时间占空比信号D_SEC，并将所述导通时间占空比信号D_SEC发送至恒流控制电路；
    所述恒流控制电路接收所述导通时间占空比信号D_SEC，并使得所述导通时间占空比信号D_SEC与预设参考电压信号VREF生成CAC电压信号；
    所述恒流控制电路再将所述CAC电压信号与所述峰值电流控制电路的峰值电流控制信号VCST转换成时间信号，并对所述时间信号做对比以输出调节信号CCOUT，所述调节信号CCOUT用以主动调节峰值电流控制信号VCST的值，以使得所述反激式开关电源电路输出恒流。
  5. 如权利要求4所述的基于连续导通模式的反激式开关电源控制方法，其特征在于，原边线圈导通时，与所述原边线圈连接的电流检测电阻输出VCS信号，所述恒流控制电路包括信号生成模块、第一计时模块、第二计时模块、及计时比较模块；
    所述信号生成模块用以将所述导通时间占空比信号D_SEC与预设参考电压信号VREF生成CAC电压信号；
    原边线圈导通时，所述第一计时模块和第二计时模块同时开始计时，并输出第一计时信号t1和第二计时信号t2，所述VCS信号上升；
    所述VCS信号与所述CAC电压信号的电压相等时，所述第一计时模块停止计时；
    原边线圈关断时，所述第二计时模块停止计时，所述计时比较模块将所述第一时间信号t1和第二时间信号t2作比对；
    所述第二时间信号t2大于两倍的第一时间信号t1，所述计时比较模块输出调节信号CCOUT，所述调节信号CCOUT为高电平以控制峰值电流控制电路降低峰值电流控制信号VCST的值，继而使得所述基于连续导通模式的反激式开关电源电路输出恒定电流。
  6. 如权利要求4所述的基于连续导通模式的反激式开关电源控制方法，其特征在于，原边线圈导通时，与所述原边线圈连接的电流检测电阻输出VCS信 号，所述恒流控制电路包括信号生成模块、第一计时模块、第二计时模块、及计时比较模块；
    所述信号生成模块用以将所述导通时间占空比信号D_SEC与预设参考电压信号VREF生成CAC电压信号；
    原边线圈导通时，所述第二计时模块开始计时以输出第二计时信号t2，所述VCS信号上升；
    所述VCS信号与所述CAC电压信号的电压相等时，所述第一计时模块开始计时以输出第一计时信号t1；
    原边线圈关断时，所述第一计时模块和第二计时模块停止计时，所述计时比较模块将所述第一时间信号t1和第二时间信号t2作比对；
    所述第二时间信号t2小于两倍的第一时间信号t1，所述计时比较模块输出调节信号CCOUT，所述调节信号CCOUT为高电平以控制峰值电流控制电路降低峰值电流控制信号VCST的值，继而使得所述基于连续导通模式的反激式开关电源电路输出恒定电流。
  7. 如权利要求5或6所述的基于连续导通模式的反激式开关电源控制方法，其特征在于，
    当所述第二时间信号t2等于两倍的第一时间信号t1时，所述基于连续导通模式的反激式开关电源电路输出的平均电流为：
    Figure PCTCN2020138083-appb-100001
    其中，RCS为电流检测电阻的阻值，n为原边线圈和副边线圈的匝数比。
  8. 如权利要求7所述的基于连续导通模式的反激式开关电源控制方法，其特征在于，所述恒流控制电路还包括延时模块，
    所述延时模块接收所述计时比较模块发送的调节信号CCOUT，判断所述调节信号CCOUT是否持续高电平，并根据判断结果以确定是否输出过载保护信号PRO，所述过载保护信号PRO用以控制所述反激式开关电源电路驱动信号关断。
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