WO2017201658A1 - 一种设备掉电保护电路 - Google Patents

一种设备掉电保护电路 Download PDF

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Publication number
WO2017201658A1
WO2017201658A1 PCT/CN2016/083021 CN2016083021W WO2017201658A1 WO 2017201658 A1 WO2017201658 A1 WO 2017201658A1 CN 2016083021 W CN2016083021 W CN 2016083021W WO 2017201658 A1 WO2017201658 A1 WO 2017201658A1
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Prior art keywords
power supply
transistor
resistor
conversion
capacitor
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PCT/CN2016/083021
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English (en)
French (fr)
Inventor
蒋建兵
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深圳市锐明技术股份有限公司
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Priority to PCT/CN2016/083021 priority Critical patent/WO2017201658A1/zh
Priority to CN201680000434.9A priority patent/CN106464128B/zh
Publication of WO2017201658A1 publication Critical patent/WO2017201658A1/zh

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/32Means for protecting converters other than automatic disconnection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/32Means for protecting converters other than automatic disconnection
    • H02M1/325Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters

Definitions

  • the present invention belongs to the technical field of electronic protection devices, and in particular, to a device power-down protection circuit.
  • An object of the present invention is to provide a device power-down protection circuit, which aims to solve the problem that the existing power-down protection circuit enters a cycle and is powered on during the protection process. The problem that caused the damage.
  • a device power-down protection circuit where the device power-down protection circuit includes:
  • the detecting end and the output end are respectively connected to the DC conversion power supply circuit and the uninterruptible power supply, and the uninterruptible power supply discharging circuit that discharges the uninterruptible power supply without detecting a voltage output of the DC conversion power supply circuit is detected.
  • the uninterruptible power supply discharge circuit includes:
  • Capacitor Cl Capacitor Cl, capacitor C2, resistor Rl, resistor R2, resistor R3, resistor R4, resistor R5, transistor Ql - transistor Q2 and MOS transistor Q3;
  • the capacitor C1 and the capacitor C2 are connected in parallel between 3V3 and the ground, the resistor R1 and the resistor R2 are connected in series between the 3V3 and the ground, and the base of the transistor Q1 is connected to the resistor R1 and the resistor.
  • a collector of the transistor Q1 is connected to 12V_CAP through the resistor R3, an emitter of the transistor Q1 is grounded, a base of the transistor Q2 is connected to a collector of the transistor, and the transistor of the transistor Q2
  • the collector is connected to the 12V_CAP through the resistor R4, the emitter of the transistor Q2 is grounded, the source of the MOS transistor Q3 is connected to the 12V-CAP, and the gate of the MOS transistor Q3 is connected to the transistor Q1.
  • the collector, the drain of the MOS transistor Q3 is grounded through the resistor R5.
  • the uninterruptible power supply includes a farad capacitor or a battery.
  • the DC conversion power supply circuit includes:
  • the input terminal IN of the DC conversion chip U1 is respectively connected to the external power source and the uninterruptible power supply, and the capacitor C3 is connected between the input terminal IN of the DC conversion chip U1 and the ground, the voltage dividing resistor R6 and a voltage dividing resistor R7 are connected in series between the input terminal IN of the DC conversion chip U1 and the collector of the transistor Q4, and the common connection terminal of the voltage dividing resistor R6 and the voltage dividing resistor R7 is connected to the DC conversion chip U1.
  • the enable terminal EN the emitter of the transistor Q4 is grounded, the base of the transistor Q4 is connected to the collector of the transistor Q5, the emitter of the transistor Q5 is grounded, and the base of the transistor Q5 is connected to the Zener diode
  • An output terminal SW of the DC conversion chip U 1 is an output end of the DC conversion power supply circuit connected to the detection end of the uninterruptible power supply discharge circuit, and an output terminal SW of the DC conversion chip U1 is connected to the stable end.
  • the cathode of the diode D1 is pressed, the anode of the Zener diode D1 is grounded, and the capacitor C4 is connected between the output terminal SW of the DC conversion chip U1 and the ground.
  • the device power-down protection circuit sets the effective input voltage of the enable signal of the DC conversion power supply circuit to be higher than the lowest accepted voltage value of the DC conversion power supply circuit, and uses the uninterruptible power supply discharge circuit to suppress The voltage of the uninterruptible power supply rebounds when the light load is switched, thereby avoiding the repetitive output of the output power of the DC conversion power supply circuit, and avoiding the existing power-down protection circuit from entering the power supply during the protection process. The process of powering down, causing damage to the equipment.
  • FIG. 1 is a structural diagram of a device power-down protection circuit according to an embodiment of the present invention.
  • FIG. 2 is a circuit structural diagram of a device power-down protection circuit according to an embodiment of the present invention.
  • FIG. 1 shows a structure of a device power-down protection circuit according to an embodiment of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown.
  • a device power-down protection circuit, the device power-down protection circuit includes:
  • the DC conversion power supply circuit 1 When the external power supply of the DC conversion power supply circuit 1 is powered down, the DC conversion power supply circuit 1 maintains an uninterruptible power supply 2 for supplying power;
  • the detecting end and the output end are respectively connected to the DC conversion power supply circuit 1 and the uninterruptible power supply 2, and the uninterruptible power supply that discharges the uninterruptible power supply 2 is detected when the DC conversion power supply circuit 1 has no voltage output.
  • Discharge circuit 3 Discharge circuit 3.
  • the uninterruptible power supply discharge circuit 3 includes:
  • capacitor Cl capacitor Cl, capacitor C2, resistor Rl, resistor R2, resistor R3, resistor R4, resistor R5, transistor Ql, transistor Q2 and MOS transistor Q3;
  • the capacitor C1 and the capacitor C2 are connected in parallel between the detecting end and the ground, the resistor R1 and the resistor R2 are connected in series between the detecting end and the ground, and the base of the transistor Q1 is connected to the resistor.
  • the collector of the transistor Q1 is connected to the output terminal through the resistor R3, the emitter of the transistor Q1 is grounded, and the base of the transistor Q2 is connected to the set of the transistor Q1 Electrode, the transistor Q2 The collector is connected to the output terminal through the resistor R4, the emitter of the transistor Q2 is grounded, the source of the MOS transistor Q3 is connected to the output terminal, and the gate of the MOS transistor Q3 is connected to the transistor Q1. The collector, the drain of the MOS transistor Q3 is grounded through the resistor R5.
  • the uninterruptible power supply 2 includes a farad capacitor or a battery.
  • the DC conversion power supply circuit 1 includes:
  • the input terminal IN of the DC conversion chip U1 is respectively connected to the external power source and the uninterruptible power supply 2, and the capacitor C3 is connected between the input terminal IN of the DC conversion chip U1 and the ground, the voltage division The resistor R6 and the voltage dividing resistor R7 are connected in series between the input terminal IN of the DC conversion chip U1 and the collector of the transistor Q4, and the common connection terminal of the voltage dividing resistor R6 and the voltage dividing resistor R7 is connected to the DC conversion chip U1.
  • the enable terminal EN, the emitter of the transistor Q4 is grounded, the base of the transistor Q4 is connected to the collector of the transistor Q5, the emitter of the transistor Q5 is grounded, and the base of the transistor Q5 is connected to the voltage regulator
  • the output terminal SW of the DC conversion chip U1 of the anode of the diode D1 is the detection end of the DC conversion power supply circuit 1 connected to the uninterruptible power supply discharge circuit 3, and the output terminal SW of the DC conversion chip U1 is connected.
  • the cathode of the Zener diode D1, the anode of the Zener diode D1 is grounded, and the capacitor C4 is connected between the output terminal SW of the DC conversion chip U1 and the ground.
  • the DC conversion chip U1 uses a chip of the type MP2315GJ.
  • other types of chips can also be used, which is merely an example.
  • Uninterruptible power supply 2 The initial state is: Discharge state; When the 3V3 power supply is normally output, its state immediately switches from the discharge state to the charge state.
  • the device power-down protection circuit sets the effective input voltage of the enable signal of the DC conversion power supply circuit to be higher than the lowest accepted voltage value of the DC conversion power supply circuit, and uses the uninterruptible power supply discharge circuit to suppress the uninterruptible power supply.
  • the voltage rebound during heavy load switching thereby avoiding the repetitive output of the output power of the DC conversion power supply circuit, and avoiding the existing power-down protection circuit in the process of protection, causing the device to enter a cycle of power-on and power-off processes. Damage to the equipment.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Stand-By Power Supply Arrangements (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

一种设备掉电保护电路,设备掉电保护电路设置DC转换电源电路(1)的使能信号有效输入电压高于DC转换电源电路(1)的最低接受电压值,利用不间断电源放电电路(3)抑制不间断电源(2)在重轻负载切换时的电压反弹,从而避免了DC转换电源电路(1)输出电源的重复性输出,避免现有的掉电保护电路在保护的过程中使设备进入一段周而复始的在上电、下电过程,对设备造成损害。

Description

发明名称:一种设备掉电保护电路 技术领域
[0001] 本发明属于电子保护设备技术领域, 尤其涉及一种设备掉电保护电路。
背景技术
[0002] 在外电切断或欠压条件下, 仍需继续工作一定吋间的电子设备, 如车载 DVR。
外电切断或欠压时, 通常是设备内置法拉电容或电池维持设备进入关机流程所 需电源能量。 现有很多电子设备在使用法拉电容或电池时存在一个致命缺陷: 法拉电容或电池在带负载状态下进入低电压值, 处在该电压值下的法拉电容或 电池不继续维持电子设备工作; 但一旦法拉电容或电池进入轻载或零负载, 法 拉电容或电池电压会立刻有一个比较大的幅值反弹, 这个电压值下, 电子设备 的部分电源电路可以工作, 从而电子设备进入短暂通电状态。 使设备进入一段 周而复始的在上电、 下电过程, 对电子产品设备造成致命性损害。
技术问题
[0003] 本发明实施例的目的在于提供一种设备掉电保护电路, 旨在解决现有的掉电保 护电路在保护的过程中使设备进入一段周而复始的在上电、 下电过程, 对设备 造成损害的问题。
问题的解决方案
技术解决方案
[0004] 本发明实施例是这样实现的, 一种设备掉电保护电路, 所述设备掉电保护电路 包括:
[0005] DC转换电源电路;
[0006] 当所述 DC转换电源电路的外部电源掉电时, 为所述 DC转换电源电路维持供电 的不间断电源;
[0007] 检测端和输出端分别与所述 DC转换电源电路和不间断电源连接, 检测到所述 D C转换电源电路没有电压输出, 对所述不间断电源进行放电的不间断电源放电电 路。 [0008] 上述结构中, 所述不间断电源放电电路包括:
[0009] 电容 Cl、 电容 C2、 电阻 Rl、 电阻 R2、 电阻 R3、 电阻 R4、 电阻 R5、 三极管 Ql - 三极管 Q2和 MOS管 Q3;
[0010] 所述电容 C1和电容 C2并联在 3V3与地之间, 所述电阻 R1和电阻 R2串联在所述 3 V3与地之间, 所述三极管 Q1的基极接所述电阻 R1和电阻 R2的公共连接端, 所述 三极管 Q1的集电极通过所述电阻 R3接 12V_CAP , 所述三极管 Ql的发射极接地, 所述三极管 Q2的基极接所述三极管 的集电极, 所述三极管 Q2的集电极通过所 述电阻 R4接所述 12V_CAP, 所述三极管 Q2的发射极接地, 所述 MOS管 Q3的源极 接所述 12V— CAP, 所述 MOS管 Q3的栅极接所述三极管 Ql的集电极, 所述 MOS管 Q3的漏极通过所述电阻 R5接地。
[0011] 上述结构中, 所述不间断电源包括法拉电容或电池。
[0012] 上述结构中, 所述 DC转换电源电路包括:
[0013] DC转换芯片 Ul、 电容 C3、 电容 C4、 稳压二极管 Dl、 分压电阻 R6、 分压电阻 R 7、 三极管 Q4和三极管 Q5;
[0014] 所述 DC转换芯片 U1的输入端 IN分别接所述外部电源和不间断电源, 所述电容 C3连接在所述 DC转换芯片 U1的输入端 IN与地之间, 所述分压电阻 R6和分压电 阻 R7串联在所述 DC转换芯片 U1的输入端 IN和三极管 Q4的集电极之间, 所述分 压电阻 R6和分压电阻 R7的公共连接端接所述 DC转换芯片 U1的使能端 EN, 所述 三极管 Q4的发射极接地, 所述三极管 Q4的基极接三极管 Q5的集电极, 所述三极 管 Q5的发射极接地, 所述三极管 Q5的基极接所述稳压二极管 D1的阳极 所述 D C转换芯片 U 1的输出端 SW为所述 DC转换电源电路的输出端接所述不间断电源放 电电路的检测端, 所述 DC转换芯片 U1的输出端 SW接所述稳压二极管 D1的阴极 , 所述稳压二极管 D1的阳极接地, 所述电容 C4连接在所述 DC转换芯片 U1的输 出端 SW与地之间。
发明的有益效果
有益效果
[0015] 在本发明实施例中, 设备掉电保护电路设置 DC转换电源电路的使能信号有效 输入电压高于 DC转换电源电路的最低接受电压值, 利用不间断电源放电电路抑 制不间断电源在重轻负载切换时的电压反弹, 从而避免了 DC转换电源电路输出 电源的重复性输出, 避免现有的掉电保护电路在保护的过程中使设备进入一段 周而复始的在上电、 下电过程, 对设备造成损害。
对附图的简要说明
附图说明
[0016] 图 1是本发明实施例提供的设备掉电保护电路的结构图;
[0017] 图 2是本发明实施例提供的设备掉电保护电路的电路结构图。
发明实施例
本发明的实施方式
[0018] 为了使本发明的目的、 技术方案及优点更加清楚明白, 以下结合附图及实施例 , 对本发明进行进一歩详细说明。 应当理解, 此处所描述的具体实施例仅仅用 以解释本发明, 并不用于限定本发明。
[0019] 图 1示出了本发明实施例提供的设备掉电保护电路的结构, 为了便于说明, 仅 示出了与本发明实施例相关的部分。
[0020] 一种设备掉电保护电路, 所述设备掉电保护电路包括:
[0021] DC转换电源电路 1 ;
[0022] 当所述 DC转换电源电路 1的外部电源掉电时, 为所述 DC转换电源电路 1维持供 电的不间断电源 2;
[0023] 检测端和输出端分别与所述 DC转换电源电路 1和不间断电源 2连接 , 检测到所 述 DC转换电源电路 1没有电压输出, 对所述不间断电源 2进行放电的不间断电源 放电电路 3。
[0024] 作为本发明一实施例, 所述不间断电源放电电路 3包括:
[0025] 电容 Cl、 电容 C2、 电阻 Rl、 电阻 R2、 电阻 R3、 电阻 R4、 电阻 R5、 三极管 Ql 、 三极管 Q2和 MOS管 Q3;
[0026] 所述电容 C1和电容 C2并联在所述检测端与地之间, 所述电阻 R1和电阻 R2串联 在所述检测端与地之间, 所述三极管 Q1的基极接所述电阻 R1和电阻 R2的公共连 接端, 所述三极管 Q1的集电极通过所述电阻 R3接所述输出端, 所述三极管 Q1的 发射极接地, 所述三极管 Q2的基极接所述三极管 Q1的集电极, 所述三极管 Q2的 集电极通过所述电阻 R4接所述输出端, 所述三极管 Q2的发射极接地, 所述 MOS 管 Q3的源极接所述输出端, 所述 MOS管 Q3的栅极接所述三极管 Q1的集电极, 所 述 MOS管 Q3的漏极通过所述电阻 R5接地。
[0027] 作为本发明一实施例, 所述不间断电源 2包括法拉电容或电池。
[0028] 作为本发明一实施例, 所述 DC转换电源电路 1包括:
[0029] DC转换芯片 Ul、 电容 C3、 电容 C4、 稳压二极管 Dl、 分压电阻 R6、 分压电阻 R 7、 三极管 Q4和三极管 Q5;
[0030] 所述 DC转换芯片 U1的输入端 IN分别接所述外部电源和不间断电源 2, 所述电容 C3连接在所述 DC转换芯片 U1的输入端 IN与地之间, 所述分压电阻 R6和分压电 阻 R7串联在所述 DC转换芯片 U1的输入端 IN和三极管 Q4的集电极之间, 所述分 压电阻 R6和分压电阻 R7的公共连接端接所述 DC转换芯片 U1的使能端 EN, 所述 三极管 Q4的发射极接地, 所述三极管 Q4的基极接三极管 Q5的集电极, 所述三极 管 Q5的发射极接地, 所述三极管 Q5的基极接所述稳压二极管 D1的阳极 所述 D C转换芯片 U1的输出端 SW为所述 DC转换电源电路 1的输出端接所述不间断电源 放电电路 3的检测端, 所述 DC转换芯片 U 1的输出端 SW接所述稳压二极管 D 1的阴 极, 所述稳压二极管 D1的阳极接地, 所述电容 C4连接在所述 DC转换芯片 U1的 输出端 SW与地之间。
[0031] 作为本发明一实施例, DC转换芯片 U1采用型号为 MP2315GJ的芯片, 当然也可 以釆用其他型号的芯片, 这里只是举例说明。
[0032] 设备掉电保护电路具体工作原理如下:
[0033] 1) 当外部供电输入且输入电压大于 6.19V时, DC转换电源电路 1使能信号准备 好, DC转换电源电路 1输出 3V3。
[0034] 2) 不间断电源 2初始状态为: 放电状态; 当 3V3电源正常输出后, 其状态立刻 从放电状态切换为充电状态。
[0035] 3) 当外部供电断供吋, DC转换电源电路 1的输入源立马切换至法拉电容或电 池; 这种情况下 DC转换电源电路 1的输出电源 3V3会维持至法拉电容或电池电压 低于 DC转换芯片 U1的最低输入电压值: 4.5V。
[0036] 4) 一旦 3V3电源没有输出, 法拉电容或电池的放电电路立马有效, 对法拉电容 或电池进行放电。
[0037] 5) 法拉电容与电池的电压在 DC转换电源电路 1停止工作的时刻 (即重负载转 入轻负载的时刻) , 因不间断电源放电电路的存在不能反弹至 6.19V以上, 从而 使 DC转换电源电路 1不能正常输出 3V3。
[0038] 6) 3V3无法重复性输出, 从而无法对设备硬件进行损坏。
[0039] 在本发明实施例中, 设备掉电保护电路设置 DC转换电源电路的使能信号有效 输入电压高于 DC转换电源电路的最低接受电压值, 利用不间断电源放电电路抑 制不间断电源在重轻负载切换时的电压反弹, 从而避免了 DC转换电源电路输出 电源的重复性输出, 避免现有的掉电保护电路在保护的过程中使设备进入一段 周而复始的在上电、 下电过程, 对设备造成损害。
[0040] 以上所述仅为本发明的较佳实施例而已, 并不用以限制本发明, 凡在本发明的 精神和原则之内所作的任何修改、 等同替换和改进等, 均应包含在本发明的保 护范围之内。

Claims

[权利要求 1] 一种设备掉电保护电路, 其特征在于, 所述设备掉电保护电路包括:
DC转换电源电路;
当所述 DC转换电源电路的外部电源掉电吋, 为所述 DC转换电源电路 维持供电的不间断电源;
检测端和输出端分别与所述 DC转换电源电路和不间断电源连接 , 检 测到所述 DC转换电源电路没有电压输出 , 对所述不间断电源进行放 电的不间断电源放电电路。
[权利要求 2] 如权利要求 1所述的设备掉电保护电路, 其特征在于, 所述不间断电 源放电电路包括:
电容 Cl、 电容 C2、 电阻 Rl、 电阻 R2、 电阻 R3、 电阻 R4、 电阻 R5、 三极管 Ql、 三极管 Q2和 MOS管 Q3;
所述电容 C1和电容 C2并联在所述检测端与地之间, 所述电阻 R1和电 阻 R2串联在所述检测端与地之间, 所述三极管 Q1的基极接所述电阻 R 1和电阻 R2的公共连接端, 所述三极管 Q1的集电极通过所述电阻 R3接 所述输出端, 所述三极管 Q1的发射极接地 所述三极管 Q2的基极接 所述三极管 Q1的集电极 , 所述三极管 Q2的集电极通过所述电阻 R4接 所述输出端, 所述三极管 Q2的发射极接地, 所述 MOS管 Q3的源极接 所述输出端, 所述 MOS管 Q3的栅极接所述三极管 Q1的集电极, 所述 MOS管 Q3的漏极通过所述电阻 R5接地。
[权利要求 3] 如权利要求 2所述的设备掉电保护电路, 其特征在于, 所述不间断电 源包括法拉电容或电池。
[权利要求 4] 如权利要求 3所述的设备掉电保护电路, 其特征在于, 所述 DC转换电 源电路包括:
DC转换芯片 Ul、 电容 C3、 电容 C4、 稳压二极管 Dl、 分压电阻 R6、 分压电阻 R7、 三极管 Q4和三极管 Q5;
所述 DC转换芯片 U1的输入端 IN分别接所述外部电源和不间断电源, 所述电容 C3连接在所述 DC转换芯片 U1的输入端 IN与地之间, 所述分 压电阻 R6和分压电阻 R7串联在所述 DC转换芯片 Ul的输入端 IN和三极 管 Q4的集电极之间, 所述分压电阻 R6和分压电阻 R7的公共连接端接 所述 DC转换芯片 U1的使能端 EN, 所述三极管 Q4的发射极接地, 所 述三极管 Q4的基极接三极管 Q5的集电极, 所述三极管 Q5的发射极接 地, 所述三极管 Q5的基极接所述稳压二极管 D1的阳极, 所述 DC转换 芯片 U 1的输出端 SW为所述 DC转换电源电路的输出端接所述不间断 电源放电电路的检测端, 所述 DC转换芯片 U1的输出端 SW接所述稳 压二极管 D1的阴极, 所述稳压二极管 D1的阳极接地, 所述电容 C4连 接在所述 DC转换芯片 U 1的输出端 SW与地之间。
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