WO2015043052A1 - 一种单级pfc反激电源输入欠压保护线路 - Google Patents

一种单级pfc反激电源输入欠压保护线路 Download PDF

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WO2015043052A1
WO2015043052A1 PCT/CN2013/088234 CN2013088234W WO2015043052A1 WO 2015043052 A1 WO2015043052 A1 WO 2015043052A1 CN 2013088234 W CN2013088234 W CN 2013088234W WO 2015043052 A1 WO2015043052 A1 WO 2015043052A1
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resistor
triode
pole
electrode
transistor
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PCT/CN2013/088234
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French (fr)
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林洁
黄鹤鸣
肖灵
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深圳市东方之星电源有限公司
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Publication of WO2015043052A1 publication Critical patent/WO2015043052A1/zh

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    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
    • H02H3/243—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for DC systems

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  • the present invention relates to the field of electronic lighting technology, and in particular, to a single-stage PFC flyback power input undervoltage protection circuit.
  • LED driver power supply is an important part of LED display, and its technology is developing rapidly.
  • PF power factor
  • the single-pole PFC flyback structure becomes the most suitable line structure for the LED driving source.
  • the driver ICs such as SY5800, SY5810, MP4021, etc., their working boot mode are powered by the Vin pin for the IC.
  • the initial high-side power supply is required for the initial startup, and the auxiliary winding is activated after startup.
  • the auxiliary winding power supply is also constant, which causes the output power to not decrease with the input voltage drop.
  • the input voltage drops below 90V, the input current will increase significantly with the decrease of the voltage.
  • transformer saturation bomber There is a transformer saturation bomber, and the input differential mode common mode inductor temperature rises to blow the winding and destroy the power supply.
  • a single-stage PFC flyback power input undervoltage protection circuit one end of the first resistor (R1), one end of the sixth resistor (R6) is connected to the positive pole of the rectifier bridge (Vin), and the C pole of the second triode (Q2) is connected to the IC.
  • the power supply terminal (Vcc), the B pole of the second transistor is connected to the other end of the sixth resistor (R6) and the C pole of the third transistor through the seventh resistor (R7) to form a second node voltage value (V2)
  • the B pole of the third triode is simultaneously connected to one end of the third resistor (R3) and the cathode of the Zener diode (ZD1), the anode of the Zener diode (ZD1) and the other end of the first resistor (R1), and the second resistor (R2)
  • the capacitor (C1) is connected to form a first node voltage value (V1), the E pole of the second transistor (Q2), the E pole of the third transistor, the other end of the third resistor (R3), and the second resistor (R2)
  • the other end, the other end of the capacitor (C1) is grounded.
  • the first transistor (Q1), the fourth resistor (R4), and the fifth resistor (R5) are further included, and the C pole of the first transistor (Q1) passes through the fourth resistor.
  • R4 connected to the anode of the Zener diode (ZD1)
  • the B pole is connected to the C pole of the third triode through a fifth resistor, and the E pole is grounded.
  • the IC may adopt any one of SY5800, SY5810, and MP4021.
  • the single-stage PFC flyback power supply input voltage undervoltage protection circuit provided by the present invention has the beneficial effects:
  • the circuit is simple, so that the production process is simple, the production efficiency is improved, and the production cost is reduced.
  • FIG. 1 is a schematic diagram of an input undervoltage protection circuit of a first embodiment of a single-stage PFC flyback power supply according to the present invention.
  • FIG. 2 is a schematic diagram of an input undervoltage protection circuit of a second embodiment of a single-stage PFC flyback power supply of the present invention.
  • the present invention provides a single-stage PFC flyback power input undervoltage protection circuit, which mainly includes a rectifier bridge positive (Vin), a power supply terminal (Vcc), and a first resistor (R1): second. Resistor (R2), third resistor (R3), fourth resistor (R4), fifth resistor (R5), sixth resistor (R6), seventh resistor (R7) first transistor (Q1), second Transistor (Q2), third triode (Q3), Zener diode (ZD1), capacitor (C1), first node voltage value (V1) and second node voltage value (V2).
  • Vin rectifier bridge positive
  • Vcc power supply terminal
  • R1 first resistor
  • one end of the first resistor (R1) and one end of the sixth resistor (R6) are simultaneously connected to the rectifier bridge positive (Vin).
  • the C pole of the second triode (Q2) is connected to the IC power supply terminal (Vcc), and the B pole is connected to the other end of the sixth resistor (R6) and the C pole of the third triode through the seventh resistor (R7).
  • the two-node voltage value (V2), the E pole is connected to ground.
  • the B pole of the third transistor is connected to one end of the third resistor (R3) and the cathode of the Zener diode (ZD1), and the E pole is connected to the ground.
  • the anode of the Zener diode (ZD1) is simultaneously connected to the other end of the first resistor (R1), one end of the second resistor (R2), and one end of the capacitor (C1) to form a first node voltage value (V1). Further, the other end of the third resistor (R3), the other end of the second resistor (R2), and the other end of the capacitor (C1) are grounded.
  • the first node voltage value When V1) is greater than the voltage regulation value of the Zener diode (ZD1), the third transistor (Q3) is turned on, the second node voltage value (V2) is zero potential, and the second transistor (Q2) is turned off.
  • the protection circuit does not work; when the input voltage is lower than the set undervoltage value, the voltage value of the first node (V1) is smaller than the voltage regulation value of the Zener diode (ZD1), and the third transistor (Q3) is turned off.
  • the second node voltage value is high, the second transistor (Q2) is turned on, the power supply terminal (Vcc) is pulled to zero potential, and the chip turns off the output, thereby implementing the undervoltage protection function.
  • the first transistor (Q1), the fourth resistor (R4), and the fifth resistor (R5) are added. Specifically, the C pole of the first transistor (Q1) is connected to the anode of the Zener diode (ZD1) via the fourth resistor (R4), and the B pole is connected to the third transistor (Q3) through the fifth resistor (R5). C pole, The E pole is grounded.
  • the protection circuit does not work; when the input voltage is lower than the set undervoltage value, the voltage value of the first node (V1) is smaller than the voltage regulation value of the Zener diode (ZD1), and the third transistor (Q3) is turned off.
  • the second node voltage value is high, the second transistor (Q2) is turned on, the power supply terminal (Vcc) is pulled to zero potential, and the chip turns off the output, thereby implementing the undervoltage protection function.
  • the fourth resistor (R4), the first transistor (Q1), and the fourth resistor (R4) constitute a hysteresis circuit at the time of undervoltage shutdown and recovery.
  • the above IC can adopt any one of the SY5800, SY5810, and MP4021 models, and the present invention adopts the SY5800 model.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Dc-Dc Converters (AREA)

Abstract

一种单级PFC反激电源输入欠压保护线路。整流桥正极连接第一电阻（R1）和第六电阻（R6），供电端（VCC）连接第二三极管（Q2）的C极；第二三极管（Q2）的B极经第七电阻（R7）连接第三三极管（Q3）的C极，并经第五电阻（R5）接第一三极管（Q1）的B极；第一三极管（Q1）的C极经第四电阻（R4）连接稳压管（DZ1）的阳极，稳压管（DZ1）的阴极连接第三三极管（Q3）的B极；第一、二、三三极管（Q1，Q2，Q3）的E极都接地。该线路成本低，线路简单，确保在输入电压不稳定地区，可有效减少电压过低造成的电源损坏。

Description

一种单级PFC反激电源输入欠压保护线路 技术领域
本发明涉及电子照明技术领域，特别涉及一种单级PFC反激电源输入欠压保护线路。
 背景技术
随着LED技术的快速发展与应用日益成熟，LED驱动电源作为LED能够发光显示的重要部分，其技术发展迅猛。为了实现节能高效要求，对LED驱动电源提出了PF（功率因素）大于或等于0.9的要求，再加上由于体积受到限制，单极PFC反激结构成为了最适用LED驱动源的线路结构。在单级PFC反激线路的典型应用中，驱动IC如SY5800、SY5810，MP4021等等，其工作开机模式均由Vin脚为IC供电，初始启动时需要原边高压侧供电，启动后为辅助绕组供电，而因输出电压恒定，辅助绕组供电也恒定，这就导致输出功率不随输入电压下降而下降，当输入电压降至90V以下工作时，输入电流会随电压的降低而显著增大，此时就存在变压器饱和炸机，输入差模共模电感温度上升熔断绕组而毁坏电源的风险。
 技术问题
为了解决上述现有的技术不足与缺陷，本发明的目的在于提供一种单级PFC反激电源输入欠压保护线路。
 技术解决方案
本发明的目的是通过采用以下技术方案来实现的：
一种单级PFC反激电源输入欠压保护线路，第一电阻（R1）一端、第六电阻（R6）一端连接整流桥正极（Vin），第二三极管（Q2）的C极连接IC供电端（Vcc），第二三极管的B极经过第七电阻（R7）与第六电阻（R6）另一端、第三三极管的C极连接形成第二节点电压值（V2），第三三极管的B极同时连接第三电阻（R3）一端和稳压管（ZD1）的阴极，稳压管（ZD1）的阳极与第一电阻（R1）另一端、第二电阻（R2）、电容（C1）连接形成第一节点电压值（V1），第二三极管（Q2）的E极、第三三极管的E极、第三电阻（R3）另一端、第二电阻（R2）另一端、电容（C1）另一端接地。
作为本发明可选技术方案，还包括第一三极管（Q1）、第四电阻（R4）和第五电阻（R5），所述第一三极管（Q1）的C极经过第四电阻（R4）连接稳压管（ZD1）的阳极， B极通过第五电阻连接第三三极管的C极， E极接地。
作为本发明可选技术方案，所述IC可以采用SY5800、SY5810、MP4021任何一种。
 有益效果
综上所述，本发明所提供的单级PFC反激电源输入欠压保护线路，具有的有益效果：
1、线路简单，电子元器件少，大大降低了成本。
2、输入欠压保护，避免因输入电压过低导致电源变压器饱和炸机，避免因输入差模共模电感温度上升熔断绕组而毁坏电源。
3、确保在输入电压不稳定地区，可有效减少电压过低造成的电源损坏。
4、线路简单从而形成生产工艺简单，提高了生产效率，降低了生产成本。
 附图说明
图1为本发明单级PFC反激电源第一实施例的输入欠压保护线路原理图。
图2为本发明单级PFC反激电源第二实施例的输入欠压保护线路原理图。
附图标记说明：Vin：整流桥正极，Vcc：供电端， R1：第一电阻，R2：第二电阻，R3：第三电阻，R4：第四电阻，R5：第五电阻，R6：第六电阻，R7：第七电阻，Q1：第一三极管，Q2：第二三极管，Q3：第三三极管，ZD1：稳压管，C1：电容，V1：第一节点电压值，V2：第二节点电压值。
 本发明的实施方式
下面通过实施例并结合附图，对本发明的技术方案作进一步详细的说明。下述参照附图对本发明的实施方式的说明旨在对本发明的总体发明构思进行解释，而不应当理解为对本发明的一种限制。
参照附图1、2所示，本发明提供一种单级PFC反激电源输入欠压保护线路，主要包括整流桥正极（Vin）、供电端（Vcc），第一电阻（R1）：第二电阻（R2）、第三电阻（R3）、第四电阻（R4）、第五电阻（R5）、第六电阻（R6）、第七电阻（R7）第一三极管（Q1）、第二三极管（Q2）、第三三极管（Q3）、稳压管（ZD1）、电容（C1）、第一节点电压值（V1）和第二节点电压值（V2）。
如图1第一实施例所示，第一电阻（R1）的一端和第六电阻（R6）的一端同时连接整流桥正极（Vin）。第二三极管（Q2）的C极连接IC供电端（Vcc），B极经过第七电阻（R7）与第六电阻（R6）的另一端、第三三极管的C极连接形成第二节点电压值（V2），E极连接地。第三三极管的B极同时连接第三电阻（R3）的一端和稳压管（ZD1）的阴极，E极与地连接。稳压管（ZD1）的阳极同时与第一电阻（R1）的另一端、第二电阻（R2）的一端、电容（C1）的一端连接后构成第一节点电压值（V1）。还有第三电阻（R3）的另一端、第二电阻（R2）的另一端、电容（C1）的另一端都接地。
根据图1第一实施例，输入电压在正常工作范围内时，第一节点电压值（ V1）大于稳压管（ZD1）的稳压值时，第三三极管（Q3）导通，第二节点电压值（V2）为零电位，第二三极管（Q2）截止， 此时保护电路不起作用；当输入电压低于设定欠压值时，第一节点电压值（V1）小于稳压管（ZD1）的稳压值，第三三极管（Q3）截止，第二节点电压值为高电位，第二三极管（Q2）导通，将供电端（Vcc）拉到零电位，芯片关闭输出，从而实现了欠压保护功能。
如图2第二实施例所示，在第一实施例原有的原理图基础上，增加第一三极管（Q1）、第四电阻（R4）和第五电阻（R5）。具体的，所述第一三极管（Q1）的C极经过第四电阻（R4）连接稳压管（ZD1）的阳极，B极通过第五电阻（R5）连接第三三极管(Q3)的C极， E极接地。
结合图2第二实施例，输入电压在正常工作范围内时，第一节点电压值（ V1）大于稳压管（ZD1）的稳压值时，第三三极管（Q3）导通，第二节点电压值（V2）为零电位，第二三极管（Q2）截止， 此时保护电路不起作用；当输入电压低于设定欠压值时，第一节点电压值（V1）小于稳压管（ZD1）的稳压值，第三三极管（Q3）截止，第二节点电压值为高电位，第二三极管（Q2）导通，将供电端（Vcc）拉到零电位，芯片关闭输出，从而实现了欠压保护功能。此时，第四电阻（R4）、第一三极管（Q1）、第四电阻（R4）组成欠压关断与恢复时的回差电路。
上述IC可以采用SY5800、SY5810、MP4021型号中的任何一种，本发明采用SY5800型号。
以上所述实施例仅表达了本发明的优选实施方式，其描述较为具体与详细，但并不能因此而理解为对本发明专利范围和实施例的限制。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。

Claims (3)

  1. 一种单级PFC反激电源输入欠压保护线路，其特征在于：第一电阻（R1）一端、第六电阻（R6）一端连接整流桥正极（Vin），第二三极管（Q2）的C极连接IC供电端（Vcc），第二三极管的B极经过第七电阻（R7）与第六电阻（R6）另一端、第三三极管的C极连接形成第二节点电压值（V2），第三三极管的B极同时连接第三电阻（R3）一端和稳压管（ZD1）的阴极，稳压管（ZD1）的阳极与第一电阻（R1）另一端、第二电阻（R2）、电容（C1）连接形成第一节点电压值（V1），第二三极管（Q2）的E极、第三三极管的E极、第三电阻（R3）另一端、第二电阻（R2）另一端、电容（C1）另一端接地。
  2. 根据权利要求1所述的单级PFC反激电源输入欠压保护线路，其特征在于：还包括第一三极管（Q1）、第四电阻（R4）和第五电阻（R5），所述第一三极管（Q1）的C极经过第四电阻（R4）连接稳压管（ZD1）的阳极， B极通过第五电阻（R5）连接第三三极管的C极， E极接地。
  3. 根据权利要求1所述的单级PFC反激电源输入欠压保护线路，其特征在于：所述IC可以采用SY5800、SY5810、MP4021任何一种。
PCT/CN2013/088234 2013-09-28 2013-11-29 一种单级pfc反激电源输入欠压保护线路 WO2015043052A1 (zh)

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