CN103166194A - Input overvoltage and under-voltage protection circuit of communication power supply module - Google Patents

Input overvoltage and under-voltage protection circuit of communication power supply module Download PDF

Info

Publication number
CN103166194A
CN103166194A CN201110423753XA CN201110423753A CN103166194A CN 103166194 A CN103166194 A CN 103166194A CN 201110423753X A CN201110423753X A CN 201110423753XA CN 201110423753 A CN201110423753 A CN 201110423753A CN 103166194 A CN103166194 A CN 103166194A
Authority
CN
China
Prior art keywords
circuit
input
output
voltage
protection circuit
Prior art date
Application number
CN201110423753XA
Other languages
Chinese (zh)
Inventor
王有利
任炳旭
Original Assignee
西安恒飞电子科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 西安恒飞电子科技有限公司 filed Critical 西安恒飞电子科技有限公司
Priority to CN201110423753XA priority Critical patent/CN103166194A/en
Publication of CN103166194A publication Critical patent/CN103166194A/en

Links

Abstract

The invention relates to a power supply module, in particular to an input overvoltage and under-voltage protection circuit of a communication power supply module. The input overvoltage and under-voltage protection circuit comprises an alternating-current filter 1, a bridge rectifying and filtering circuit 2, a soft start circuit 3, a power conversion circuit 4, a secondary output rectifying and filtering circuit 5 and a pulse width modulation (PWM) control circuit 6. The input overvoltage and under-voltage protection circuit of the communication power supply module is characterized in that an input overvoltage and under-voltage protection circuit body 12 is arranged between an input end of the bridge rectifying and filtering circuit 2 and the PWM control circuit 6.

Description

通信电源模块的输入过电压、欠电压保护电路 Communication module power input overvoltage, undervoltage protection circuit

技术领域 FIELD

[0001] 本发明涉及一种电源模块,尤其涉及一种通信电源模块的输入过电压、欠电压保护电路。 [0001] The present invention relates to a power module, and particularly to a communication module power input over voltage, under voltage protection circuit.

背景技术 Background technique

[0002] 随着科学技术的飞速发展,通信行业与人们的关系日益密切,在人们日常工作、生活中发挥着越来越重要的作用。 [0002] With the rapid development of science and technology, communications industry and people's increasingly close relationship, it is playing an increasingly important role in people's daily work and life. 任何通信设备都离不开稳定可靠的电源作为供电系统,而开关电源因具有稳压范围宽、体积小、效率高、使用方便灵活等突出优点,逐渐在通信设备中被广泛使用。 Any communications device can not be separated as a stable and reliable power supply system, because the switching power supply having a voltage range, small size, high efficiency, easy to use and flexible outstanding advantages, increasingly widely used in a communication device.

[0003] 同时许多高新技术,如高频开关技术、软开关技术、功率因数校正技术、同步整流技术、智能化技术、表面安装技术等电源相关技术的发展。 [0003] Many related art power development of high-tech, high-frequency switching technology, soft-switching technology, power factor correction technology, synchronous rectification, intelligent technology, surface mount technology at the same time. 开关电源技术也在不断地创新,这也为开关电源广泛应用于通信设备中提供了更大的发展空间。 Switching power supply technology is constantly innovating, which is widely used in communications switching power supply device provides more room for development. 由于开关电源的控制电路比较复杂,晶体管和集成器件耐电、热冲击的能力相对较差。 Since the switching power supply control circuit is complicated, power transistors and integrated device resistance, thermal shock capability is relatively poor. 并且开关电源在工作时还经常会受到各种外界因素的干扰,从而产生电压波动,造成过、欠电压等状况,这样势必造成电源的输出不稳定。 And switching power supplies are often subject to interference of various external factors at work, also resulting in voltage fluctuations caused over, under voltage and other conditions, this will inevitably cause an unstable output power supply. 如果通信设备长期工作在该环境中,会受到极大程度的损坏,将会给用户带来很大不便。 If the communication device long-term work in that environment, will be a great degree of damage, it will bring great inconvenience to the user.

发明内容 SUMMARY

[0004] 本发明的目的是提供一种可抗击多种外界因素干扰的通信电源模块的输入过电压、欠电压保护电路。 [0004] The object of the present invention is to provide a communication power supply module to combat various external factors of disturbance input overvoltage, undervoltage protection circuit.

[0005] 本发明的目的是这样实现的,通信电源模块的输入过电压、欠电压保护电路,包括••交流滤波1、桥式整流滤波电路2、软启动电路3、功率变换电路4、二次输出整流滤波电路5、PWM控制电路6 ;其特征是:桥式整流滤波电路2的输入端与PWM控制电路6之间有输入过电压、欠电压保护电路12 ;所述的输入过电压、欠电压保护电路12的输入端与交流滤波I输出端或桥式整流滤波电路2的输入端,取样电压分为两路,一路经R1、R2分压,Rl和R2的连接点经电容Cl对地滤波后,在通过R3、R4分压后输入到第一比较器的同相端3脚;另一路经R7、R8分压,R7和R8的连接点经电容C2对地滤波后,在通过R9、R10分压后输入到第二比较器的异相端6脚,由电阻R5、R6、R11、R12构成桥路,电阻R5和Rll连接后接负端,电阻R6和R12连接后接脚基准电压,电阻R5和电阻R6另一端接第一比较器的异相 [0005] The object of the present invention is implemented, communication power module input overvoltage, undervoltage protection circuit, comprising •• AC filter 1, a bridge rectifier and filter circuit 2, the soft start circuit 3, a power conversion circuit 4, two secondary output rectifier and filter. 5, PWM control circuit 6; characterized in that: the input terminal of the bridge rectifier filter circuit 2 and the PWM control circuit 6 between the input over-voltage, under-voltage protection circuit 12; the input overvoltage, AC input terminal of the filter circuit 12 under voltage I input terminal of the output filter or bridge rectifier circuit 2, the sampled voltage is divided into two parts, one by R1, R2 dividing point of attachment of Rl and R2 via a capacitor Cl to after the filtering, after passing through R3, R4 divided voltage input to the first comparator inverting terminal 3 feet; another path R7, R8 partial pressure, R7 and R8 via the connection point of the capacitor C2 after filtered by R9 , R10 dividing the input to the second terminal of phase comparator 6 feet, by resistors R5, R6, R11, R12 constitute the bridge circuit, and the resistor R5 is connected to the negative terminal of Rll, after the reference pin connected resistors R6 and R12 -phase voltage, the resistors R5 and R6 other end of the first comparator 2脚,电阻Rll和电阻R12另一端接第二比较器的同相端5脚,第一比较器和第二比较器输出端分别通过二只二极管正向导通过后与PWM控制电路6的脉宽调制电路604输入端电连接;如取样电压低于5脚基准电压,第二比较器的7脚输出高电平去控制PWM控制电路6关断,电源无输出;如取样电压高于2脚基准电压,第一比较器的I脚输出高电平去控制PWM控制电路6使其关断,电源无输出。 2 feet, the resistance of the resistor Rll and R12 the other end of the second comparator inverting terminal pin 5, the first comparator and the second comparator output, respectively, forward the pulse width modulation by the PWM circuit 6 is controlled by two diodes circuit 604 is electrically connected to an input terminal; the sampled voltage is lower than the reference voltage pin 5, pin 7 of the second comparator outputs a high level control to the PWM control circuit 6 is turned off, no output power; the sample voltage is higher than the reference voltage pin 2 , the I feet high output of the first comparator to control the PWM control circuit 6 so that it is turned off, no output power.

[0006] PWM控制电路6由驱动电路601、取样电路602、比较放大电路603、脉宽调制电路604、基准电路605构成,交流电压经交流滤波I进行滤波后输出与桥式整流滤波电路2的输入端电连接,经桥式整流滤波进行输出,桥式整流滤波电路2的输出端经软启动电路3后与功率变换电路4电连接,功率变换电路4的受控端与PWM控制电路6的控制端电连接,PWM控制电路6输入与二次输出整流滤波电路5输出端电连接,由PWM控制电路6的取样电路602检测输出电压波动信号或输出电流波动信号,输出电压波动信号或输出电流波动信号与基准电路605的基准信号一起输入到比较放大电路603的输入端,由比较放大电路603的输出端与脉宽调制电路604的控制端电连接,控制脉宽调制电路604的脉宽,脉宽变化信号经驱动电路601放大控制功率变换电路4稳定电压波动或电流波动。 [0006] PWM control circuit 6603, a pulse width modulation circuit 604, a reference circuit 605 comprises a drive circuit 601, sampling circuit 602, comparator amplifier, the alternating voltage AC filter for filtering the output I of the bridge rectifier and filter circuit 2 an input terminal electrically connected, via the bridge rectifier filter output, the output terminal of the bridge rectifier and filter circuit 2 is connected to the soft start circuit of a power conversion circuit 3 through 4, the controlled terminal of the power conversion circuit 4 and the PWM control circuit 6 a control terminal electrically connected to the input PWM control circuit 6 and the secondary output rectifier filter circuit 5 is electrically connected to an output terminal, by a PWM control circuit 602 detects an output voltage or output current ripple signal fluctuation signal, the output voltage or output current ripple signal sampling circuit 6 fluctuation of the input signal and the reference circuit 605 with a reference signal to an input of comparator amplifier 603 is connected to the control terminal of the output terminal of the pulse width modulation circuit 604 of comparator amplifier 603 controls the pulse width of the pulse width modulation circuit 604, the pulse width modulation signal driving circuit 601 controls the power conversion circuit 4 amplifies a stable voltage fluctuations or current fluctuations.

[0007] 二次输出整流滤波电路5包括续流二极管、储能电感和滤波电容组成。 [0007] the secondary output rectifier and filter 5 comprises a freewheeling diode, storage inductor and filter capacitors.

[0008] 软启动保护电路3由限流电阻R16和电容器C3构成,限流电阻R16和电容器C3的连接点与功率变换电路的第一输入绕组LI和第二输入绕组L2的连接连接,限流电阻R16另一端与桥式整流滤波电路的输出端电连接,电容器C3与电源负端电连接;当电源接通瞬间,软启动保护电路3开始工作,输入电压经整流桥U和限流电阻R16对电容器C3充电,由于开机时,C3的电压为零,因此,逆变器开机时不能正常工作,也就是限制了开机时产生的浪涌电流;当电容器C3充电到约80%额定电压时,逆变器正常工作,经主变压器辅助绕组产生晶闸管Vl的触发信号,使晶闸管导通并短路限流电阻R16,开关电源处于正常运行状态。 [0008] The soft start protection circuit 3 and the resistor R16 by the current limiting capacitor C3, connected to the first input winding LI limiting resistor R16 and the connection point of the capacitor C3 and the power conversion circuit and the second input winding L2 is connected, the current limiting the other end of the resistor R16 and the output terminal is electrically connected to the bridge rectifier and filter circuit, the capacitor C3 is electrically connected to the negative power supply terminal; instant when the power is turned on, the soft start protection circuit 3 starts working, by the rectifier bridge input voltage U and current limiting resistor R16 charges the capacitor C3, since the boot, the C3 voltage is zero, therefore, the inverter power does not work, limits the inrush current is generated when the boot; when the capacitor C3 is charged to approximately 80% of the rated voltage, normal inverter operation, the auxiliary winding generating a trigger signal via the main transformer Vl thyristor, thyristor is turned on and short-circuit current limiting resistor R16, the switching power supply in the normal state.

[0009] 第一比较器和第二比较器是LM2904。 [0009] The first comparator and the second comparator is an LM2904.

[0010] 所述的功率变换电路4包括逆变变压器T、开关调整管V2,逆变变压器T包括第一输入绕组LI和第二输入绕组L2和第一输出绕组L3和第二输出绕组L4,第二输入绕组L2的一端与开关调整管V2电连接,开关调整管V2与驱动电路601电连接,驱动电路601控制开关调整管V2导通和关闭时间,开关调整管7电连接有过电流保护电路。 A power conversion circuit 4 [0010] The inverter comprises a transformer T, switching regulator V2, the inverter transformer T comprises a first input winding LI and the second input winding and first output winding L2 L3 and the second output winding L4, a second input winding L2 has one end electrically connected to the switching regulator V2, V2 switching regulator circuit 601 is electrically connected to the drive, the drive circuit 601 controls the switching regulator V2 on and off time, a switching regulator tube 7 is electrically connected to an overcurrent protection circuit.

[0011] 过电流保护电路由三极管V2和分压电阻R13、R14组成,电阻R13和R14串接在保护开关调整管Vl的输入端与地之间,电阻R13和R14的连接点与三极管V2基极电连接,三极管V2的发射极与开关调整管Vl的发射极电连接,三极管V2的集电极通过电阻R15与开关调整管Vl的集电极电连接。 [0011] The overcurrent protection circuit by the transistor V2 and the voltage dividing resistors R13, R14 composed of resistors R13 and R14 connected in series between the input terminal and the switching regulator to protect the Vl, resistor R13 and the connection point of the transistor V2 of the group R14 electrically connected, the transistor V2 and the emitter of emitter switching regulator electrically connected Vl, V2 are connected to the collector of transistor Vl to adjust the collector of the tube through the resistor R15 and the switch.

[0012] 开关调整管7电连接有过热保护电路过。 [0012] The switching regulator 7 is electrically connected through an overheat protection circuit.

[0013] 过热保护电路包括:电容C、电阻Rr和热晶闸管TT201,电容C、电阻Rr并联后接在热晶闸管TT201的正电极和控制电极之间;热晶闸管TT201正电极接开关调整管基极,热晶闸管TT201的负电极接开关调整管发射极。 [0013] The overheat protection circuit comprising: a capacitor C, and the heat resistance Rr thyristor TT201, capacitance C, will resistance Rr connected in parallel between the positive electrode and the control electrode of the heat thyristor TT201; thermal positive electrode TT201 thyristor switching regulator base thermal negative electrode TT201 thyristor switching regulator emitter.

[0014] 开关调整管7固定在带散热槽的壳体8上,大功率开关调整管7通过导热绝缘垫9和绝缘衬套10上下与带散热槽的壳体8进行绝缘。 [0014] The switching regulator 8, power switching regulator housing 7 is fixed with a heat pipe 7 through the grooves 9 and the insulating pads thermally insulating liner 10 and the upper and lower casing with thermal insulation grooves 8.

[0015] 本发明的优点是:由于采用多种安全保护电路可以有效保护电源自身和负载的正常工作,具有较高的工作可靠性,可以减少用电设备维修成本,进一步降低通信系统的整体运营成本。 [0015] The advantage of the present invention are: As a result of more effective security protection circuit may protect the normal operating power and the load itself, has high reliability, electrical equipment maintenance costs can be reduced, further reducing overall operating a communication system cost.

附图说明 BRIEF DESCRIPTION

[0016] 下面结合附图和具体实施方式对本发明进行详细说明: [0016] The present invention will be described in detail in conjunction with accompanying drawings and specific embodiments:

图1是本发明电源的主电路结构框图; FIG. 1 is a block diagram of the main power source circuit of the invention;

图2是图1的电路原理图; FIG 2 is a circuit diagram of FIG. 1;

图3为输入过电压、欠电压保护电路的原理图; 图4为输入过电流保护电路的原理图; 3 is input overvoltage, undervoltage protection circuit diagram; Figure 4 is a schematic diagram of a current protection circuit through the input;

图5为过热保护电路的原理图; FIG 5 is a schematic diagram of the overheating protection circuit;

图6是大功率开关调整管散热结构示意图俯视图; FIG 6 is a schematic diagram of a switching regulator power dissipation structure plan view;

图7是大功率开关调整管散热结构示意图主视图。 FIG 7 is a schematic diagram of a switching regulator power dissipation structure of the main view of the tube.

[0017] 图中,1、交流滤波;2、桥式整流滤波电路;3、软启动电路;4、功率变换电路;5、二次输出整流滤波电路;6、PWM控制电路;7、开关调整管;8、带散热槽的壳体;9、导热绝缘垫; [0017] FIG, 1, AC filter; 2, a bridge rectifier and filter circuit; 3, soft start circuit; 4, a power conversion circuit; 5, the secondary output rectifier and filter circuit; 6, PWM control circuit; 7, switching regulator tube; 8, finned casing slot; 9, thermal insulating pad;

10、绝缘衬套;11、螺钉;12、输入过电压、欠电压保护电路。 10, the insulating bush; 11, screw; 12, input over voltage, under voltage protection circuit.

具体实施方式 Detailed ways

[0018] 参见图1和图2所示,通信电源模块的输入过电压、欠电压保护电路,包括:交流滤波1、桥式整流滤波电路2、软启动电路3、功率变换电路4、二次输出整流滤波电路5、PWM控制电路6 ;PWM控制电路6由驱动电路601、取样电路602、比较放大电路603、脉宽调制电路604、基准电路605构成,交流电压经交流滤波I进行滤波后输出与桥式整流滤波电路2的输入端电连接,经桥式整流滤波进行输出,桥式整流滤波电路2的输出端经软启动电路3后与功率变换电路4电连接,功率变换电路4的受控端与PWM控制电路6的控制端电连接,PWM控制电路6输入与二次输出整流滤波电路5输出端电连接,由PWM控制电路6的取样电路602检测输出电压波动信号或输出电流波动信号,输出电压波动信号或输出电流波动信号与基准电路605的基准信号一起输入到比较放大电路603的输入端,由比较放大电 [0018] Referring to FIGS. 1 and 2, the input voltage of the communication over the power module, undervoltage protection circuit, comprising: an AC filter, a bridge rectifier and filter circuit 2, the soft start circuit 3, a power conversion circuit 4, the secondary an output rectifier and filter circuit 5, PWM control circuit 6; after the PWM control circuit 6 by the driving circuit 601, sampling circuit 602, comparator amplifier 603, a pulse width modulation circuit 604, a reference circuit 605 constituted by the AC voltage AC filter for filtering the output I is electrically connected to the input terminal of the bridge rectifier and filter circuit 2, the bridge rectifier output filter, the output terminal of the bridge rectifier and filter circuit 2 via the soft start circuit and a power conversion circuit 4 is electrically connected to 3, by the power conversion circuit 4 control terminal and control terminal of the PWM control circuit 6 is connected to the input PWM control circuit 6 and the output rectifying the secondary output terminal 5 is electrically connected to the filter circuit, the sampling circuit 602 detects an output voltage or output current ripple signal fluctuation signal by the PWM control circuit 6 , the output voltage or output current ripple signal fluctuation signal with a reference signal input circuit 605 with reference to the input terminal of the comparator circuit 603 is amplified by the amplifying comparator 603的输出端与脉宽调制电路604的控制端电连接,控制脉宽调制电路604的脉宽,脉宽变化信号经驱动电路601放大控制功率变换电路4稳定电压波动或电流波动,桥式整流滤波电路2的输入端与PWM控制电路6之间有输入过电压、欠电压保护电路12。 Electrical output control terminal 603 the pulse width modulation circuit 604, and controls the pulse width of the pulse width modulation circuit 604, the pulse width modulation signal driving circuit 601 controls the power conversion circuit 4 amplifies the steady current fluctuations, voltage fluctuations or bridge rectifier there the input terminal of the filter circuit 2 and the PWM control circuit 6 between the over-voltage, under-voltage protection circuit 12.

[0019] 二次输出整流滤波电路5包括续流二极管、储能电感和滤波电容组成。 [0019] the secondary output rectifier and filter 5 comprises a freewheeling diode, storage inductor and filter capacitors.

[0020] 参见图2所示,功率变换电路4包括逆变变压器T、开关调整管V2,逆变变压器T包括第一输入绕组LI和第二输入绕组L2和第一输出绕组L3和第二输出绕组L4,第二输入绕组L2的一端与开关调整管V2电连接,开关调整管V2与驱动电路601电连接,驱动电路601控制开关调整管V2导通和关闭时间,开关电源的电路比较复杂,在开关电源的输入端一般接有小电感、大电容的输入滤波器。 [0020] Referring to Figure 2, the power conversion circuit 4 comprises an inverter transformer T, switching regulator V2, the inverter transformer T comprises a first input winding LI and the second input winding and first output winding L2 L3 and the second output winding L4, the second input end of winding L2 and switching regulator electrically connected to V2, V2 switching regulator circuit 601 is electrically connected to the drive, the drive circuit 601 controls the switching regulator V2 on and off time of the switching power supply circuit is more complex, at the input of the switching power supply is generally connected with the small inductance and large capacitance of the input filter. 在开机瞬间,滤波电容器会流过很大的浪涌电流,这个浪涌电流可以为正常输入电流的数倍。 In instant start, will flow through the large filter capacitor inrush current, the inrush current can be several times the normal input current. 这样大的浪涌电流会使普通电源开关的触点或继电器的触点熔化,并使输入保险丝熔断。 Such large inrush current may contact or relay contact welding ordinary power switch, and the input fuse is blown. 另外,浪涌电流也会损害电容器,使之寿命缩短,过早损坏。 Furthermore, inrush current can also damage the capacitor, so as to shorten the life span prematurely. 为此,在本电源中使用软启动保护电路3。 For this purpose, the soft start protection circuit 3 in the present power supply.

[0021] 软启动保护电路3由限流电阻R16和电容器C3构成,限流电阻R16和电容器C3的连接点与功率变换电路的第一输入绕组LI和第二输入绕组L2的连接连接,限流电阻R16另一端与桥式整流滤波电路的输出端电连接,电容器C3与电源负端电连接;当电源接通瞬间,软启动保护电路3开始工作,输入电压经整流桥U和限流电阻R16对电容器C3充电,由于开机时,C3的电压为零,因此,逆变器开机时不能正常工作,也就是限制了开机时产生的浪涌电流;当电容器C3充电到约80%额定电压时,逆变器正常工作。 [0021] The protection circuit 3 soft start resistor R16 and the capacitor C3 form a flow restrictor, connecting the first input winding LI limiting resistor R16 and the connection point of the capacitor C3 and the power conversion circuit and the second input winding L2 is connected, the current limiting the other end of the resistor R16 and the output terminal is electrically connected to the bridge rectifier and filter circuit, the capacitor C3 is electrically connected to the negative power supply terminal; instant when the power is turned on, the soft start protection circuit 3 starts working, by the rectifier bridge input voltage U and current limiting resistor R16 charges the capacitor C3, since the boot, the C3 voltage is zero, therefore, the inverter power does not work, limits the inrush current is generated when the boot; when the capacitor C3 is charged to approximately 80% of the rated voltage, The inverter is working properly. 经主变压器辅助绕组产生晶闸管Vl的触发信号,使晶闸管导通并短路限流电阻R16,开关电源处于正常运行状态。 Through auxiliary winding Vl thyristor trigger signal is generated, so that the thyristor and short-circuit current limiting resistor R16, the switching power supply in the normal state. 因此,选择合适的的电容C3,就能防止开机时产生的浪涌电流。 Thus, to select the appropriate capacitor C3, the inrush current can be prevented when boot.

[0022] 如图3所示,输入过电压、欠电压保护电路12的输入端与交流滤波I输出端或桥式整流滤波电路2的输入端,取样电压分为两路,一路经Rl、R2分压,Rl和R2的连接点经电容Cl对地滤波后,在通过R3、R4分压后输入到第一比较器的同相端3脚。 [0022] As shown in FIG 3, the input over-voltage, input AC voltage protection circuit 12 under the filter I output terminal of the bridge rectifier or an input terminal of the filter circuit 2, the sampled voltage is divided into two parts, one by Rl, R2 partial pressure, the point Rl and R2 is connected via a capacitor Cl to ground after filtering, after passing through R3, R4 divided voltage input to the first comparator inverting terminal of 3 feet. 另一路经R7、R8分压,R7和R8的连接点经电容C2对地滤波后,在通过R9、R10分压后输入到第二比较器的异相端6脚,由电阻R5、R6、R11、R12构成桥路,电阻R5和Rll连接后接负端,电阻R6和R12连接后接脚基准电压,电阻R5和电阻R6另一端接第一比较器的异相端2脚,电阻Rll和电阻R12另一端接第二比较器的同相端5脚,第一比较器和第二比较器输出端分别通过二只二极管正向导通过后与PWM控制电路6的脉宽调制电路604输入端电连接。 Another pass R7, R8 partial pressure, the connection point of R7 and R8 to ground via filter capacitor C2, after passing through R9, R10 divided voltage is input to the second comparator-phase terminal 6 feet by resistors R5, R6, R11, R12 then constitute the negative terminal of the bridge circuit, and a resistor R5 connected Rll, 2-phase end of the rear leg resistors R6 and R12 connected to the reference voltage pin, resistor R5 and the resistor R6, the other end of the first comparator, and a resistor Rll a resistor R12 the other end of the second comparator inverting terminal pin 5, the first comparator and the second comparator output, respectively, after the forward 604 by the PWM pulse width modulation circuit input terminal electrically connected to the control circuit 6 through two diodes . 如取样电压低于5脚基准电压,第二比较器的7脚输出高电平去控制PWM控制电路6关断,电源无输出。 The sampled voltage is lower than the reference voltage pin 5, pin 7 of the second comparator outputs a high level control to the PWM control circuit 6 is turned off, no output power. 从而保护开关调整管不会因为输入电压过高或过低而损坏。 Thereby protecting the switching regulator as the input voltage is not too high or too low damage. 如取样电压高于2脚基准电压,第一比较器的I脚输出高电平去控制PWM控制电路6使其关断,电源无输出。 The sampled voltage is higher than the reference pin 2 voltage, I feet high output of the first comparator to control the PWM control circuit 6 so that it is turned off, no output power. 第一比较器和第二比较器是LM2904。 The first comparator and the second comparator is a LM2904.

[0023] 参见图4所示,为了保护开关调整管7在电路短路、电流增大时不被烧毁,采用了过电流保护电路。 [0023] Referring to FIG. 4, in order to protect the switching regulator 7 is not burned at the short circuit current increases, using the overcurrent protection circuit. 过电流保护电路由三极管V2和分压电阻R13、R14组成。 The overcurrent protection circuit by the transistor V2 and the voltage dividing resistors R13, R14 composition. 电阻R13和R14串接在保护开关调整管Vl的输入端与地之间,电阻R13和R14的连接点与三极管V2基极电连接,三极管V2的发射极与开关调整管Vl的发射极电连接,三极管V2的集电极通过电阻R15与开关调整管Vl的集电极电连接。 Resistors R13 and R14 connected in series between the input terminal and the switching regulator to protect the Vl, resistors R13 and R14 and the connection point of the transistor V2 is electrically connected to the base electrode, the emitter electrode of the switching power regulator emitter of the triode V2 is connected Vl electric collector, the collector of the triode V2 through resistor R15 is connected to the switching regulator Vl.

[0024] 电路正常工作时,通过R13与R14的分压作用,使得V2的基极电位比发射极电位低,发射结承受反向电压。 [0024] Normal operation of the circuit, voltage division by R13 and R14 so that the base potential V2 lower than the potential of the emitter, the emitter withstand reverse voltage. 于是V2处于截止状态(相当于开路),对稳压电路没有影响。 Thus V2 in the OFF state (corresponding to an open circuit), no effect on the voltage regulator circuit. 当输出电压为零,V2的发射极相当于接地,则V2处于饱和导通状态(相当于短路),从而使开关调整管Vl基极和发射极近于短路,而处于截止状态,切断电路电流,从而达到保护目的。 When the output voltage is zero, the emitter electrode V2 corresponds to the ground, in the state of saturated conduction V2 (corresponding to a short circuit), so that the switching regulator Vl base and emitter short-circuited close to, but is in an off state, cutting off the current circuit , so as to achieve the purpose of protection. 过电流保护电路其基本方法是,当输出电流超过某一值时,开关调整管处于反向偏置状态,从而截止,自动切断电路电流。 The overcurrent protection circuit which basically is, when the output current exceeds a certain value, the switching regulator is in a reverse bias state, thereby turning off, automatically cut off the current circuit.

[0025] 参见图5所示,开关电源中开关稳压器的高集成化和轻量小体积,使其单位体积内的功率密度大大提高,因此如果电源装置内部的元器件对其工作环境温度的要求没有相应提高,必然会使电路性能变坏,元器件过早失效。 [0025] Referring to Figure 5, the switching power supply switching regulator high integration and small size and lightweight, so that the power density per unit volume is greatly improved, so if the internal components of the power supply means to its operating environment temperature requirement was not improved, the circuit will inevitably deteriorated performance, premature component failure. 一般大功率开关调整管允许的最高管壳温度是75°C,同时温度是影响电源设备可靠性的最重要因素。 Usually high-power switch tube allows adjustment of the maximum bulb temperature of 75 ° C, while the temperature is the most important factor to affect the reliability of the power supply. 根据有关资料分析表明电子元器件温度每升高2°C,可靠性下降10%,温升50°C时的工作寿命只有温升25°C时的1/6,为了避免功率器件过热造成损坏,因此在本发明电源模块电路中设置了过热保护电路。 Based on the data showed that the electronic component temperature is increased by 2 ° C, 10% decline in reliability, only 1/6 of working life at 25 ° C temperature rise of 50 ° C, in order to avoid overheating damage the power device therefore overheating protection circuit is provided in the circuit of the power module of the present invention.

[0026] 过热保护电路包括:电容C、电阻Rr和热晶闸管TT201,电容C、电阻Rr并联后接在热晶闸管TT201的正电极和控制电极之间。 [0026] The overheating protection circuit comprising: a capacitor C, and the heat resistance Rr thyristor TT201, capacitance C, will resistance Rr connected in parallel between the positive electrode and the thermal control electrode of the thyristor TT201. 热晶闸管TT201正电极接开关调整管基极,热晶闸管TT201的负电极接开关调整管发射极,根据热晶闸管的特性,由Rr值确定该器件的导通温度,Rr越大,导通温度越低。 TT201 positive electrode thyristor heat regulator switch base, heat thyristor TT201 negative electrode emitter switching regulator, thyristor according to the characteristics of the heat, the device is determined by the value Rr is turned on temperature, Rr greater, the temperature turned low. 当将其放置开关调整管附近,或在电源装置内时,开关调整管的基极电流被η控制栅型热晶闸管TT201旁路,开关管截止,切断集电极电流,防止过热。 When placed near the switching regulator, or in the power supply device, a switching regulator the base current is η pipe gate controlled thyristor TT201 thermal bypass switch is turned off, cutting off the collector current to prevent overheating.

[0027] 参见图6和图7所不,由于大功率开关调整管7允许的最闻管壳温度是75。 [0027] Referring to FIGS. 6 and 7 is not due to the maximum allowed power adjustment switch smell bulb temperature of the tube 7 is 75. . ,为了避免功率器件过热造成损坏,大功率开关调整管7固定在带散热槽的壳体8上,大功率开关调整管7通过导热绝缘垫9和绝缘衬套10上下与带散热槽的壳体8进行绝缘,固定螺钉11采用Μ3Χ20。 To avoid damage from overheating power devices, high-power switching regulator housing 7 is fixed with heat grooves 8, power switching regulator 79 and the insulating bush 10 and the vertical groove with a heat insulating housing by a thermally conductive pad 8 insulated, using a fixing screw 11 Μ3Χ20. 由于带散热槽的壳体8散热面大,不影响整体体积,使大功率开关调整管7最高管壳温度大大低于75°C。 Since the housing 8 with a heat radiating surface of the large groove, does not affect the overall volume of the high-power switch tube 7 to adjust the maximum case temperature well below 75 ° C. [0028] 本发明通信电源模块还支持后备铅酸蓄电池功能,后备铅酸蓄电池从主电路28V端口接入,当市电正常供电时,不需要蓄电池供电。 [0028] The communication module of the present invention also supports a power lead-acid battery back-up function, from 28V lead-acid battery backup port access main circuit, when the normal electricity supply, do not need battery power. 当市电正常供电过程中突然中断或电源过欠压保护时,能够自动切换到铅酸蓄电池供电,确保电源正常工作。 When the mains power supply during normal power supply is suddenly interrupted or when over-voltage protection, can automatically switch to lead-acid battery power, make sure the power to work. 同时输入在线信号输出高电平告警。 Outputs a high level signal while the input line alarm.

[0029] 以上对本发明所述的通信电源模块的输入过电压、欠电压保护电路进行了详细的说明。 [0029] more input overvoltage communication power module according to the present invention, undervoltage protection circuit is described in detail. 在不背离本发明所述技术方案的精神和权利要求范围的情况下对它进行的各种显而易见的改变都在本发明的保护范围之内。 Its various obvious changes made without departing from the spirit of the present invention and claimed in the aspect of the scope of the claims are within the scope of the present invention.

[0030] 本发明是针对通信设备对供电模块高安全性和高可靠性的要求,而设计的通信电源模块的输入过电压、欠电压保护电路。 [0030] The present invention is directed to a communication apparatus of high safety and reliability requirements of the power supply module, and the input voltage over a communication power supply module design, undervoltage protection circuit. 该通信电源模块可以在恶劣环境及突发故障情况下安全可靠地工作,减少通信运营商的日常运营费用。 The communication power module can be safely and reliably operate in harsh environments and unexpected fault conditions, reduce communication operator's daily operating expenses.

Claims (10)

1.通信电源模块的输入过电压、欠电压保护电路,包括:交流滤波1、桥式整流滤波电路2、软启动电路3、功率变换电路4、二次输出整流滤波电路5、PWM控制电路6 ;其特征是:桥式整流滤波电路2的输入端与PWM控制电路6之间有输入过电压、欠电压保护电路12 ;所述的输入过电压、欠电压保护电路12的输入端与交流滤波I输出端或桥式整流滤波电路2的输入端,取样电压分为两路,一路经Rl、R2分压,Rl和R2的连接点经电容Cl对地滤波后,在通过R3、R4分压后输入到第一比较器的同相端3脚;另一路经R7、R8分压,R7和R8的连接点经电容C2对地滤波后,在通过R9、R10分压后输入到第二比较器的异相端6脚,由电阻R5、R6、R11、R12构成桥路,电阻R5和Rll连接后接负端,电阻R6和R12连接后接脚基准电压,电阻R5和电阻R6另一端接第一比较器的异相端2脚,电阻Rll和电阻R12另一端接第 1. The power input over-voltage communication module, undervoltage protection circuit, comprising: an AC filter, a bridge rectifier and filter circuit 2, the soft start circuit 3, a power conversion circuit 4, the secondary output rectifier and filter circuit 5, PWM control circuit 6 ; characterized in that: between the 6 input over-voltage input terminal of the bridge rectifier filter circuit 2 and the PWM control circuit, undervoltage protection circuit 12; the input overvoltage, filtered AC input undervoltage protection circuit 12 I output or input terminal of the bridge rectifier filter circuit 2, the sampled voltage is divided into two parts, one by Rl, R2 partial pressure, the point Rl and R2 is connected via a capacitor Cl to ground after filtered by R3, R4 partial pressure after the input to the first comparator inverting terminal 3 feet; another path R7, R8 partial pressure, R7 and R8 point via a capacitor C2 is connected after the filter, after passing through R9, R10 divided voltage is input to the second comparator the end of phase legs 6, the resistors R5, R6, R11, R12 constitute the bridge circuit, and the resistor R5 is connected to the negative terminal of Rll, R12 and the resistor R6 connected to pin the reference voltage, the resistors R5 and R6 on the other end a comparator of phase legs 2, a resistor Rll and the other end of the first end of a resistor R12 比较器的同相端5脚,第一比较器和第二比较器输出端分别通过二只二极管正向导通过后与PWM控制电路6的脉宽调制电路604输入端电连接;如取样电压低于5脚基准电压,第二比较器的7脚输出高电平去控制PWM控制电路6关断,电源无输出;如取样电压高于2脚基准电压,第一比较器的I脚输出高电平去控制PWM控制电路6使其关断,电源无输出。 The inverting terminal of the comparator 5 feet, the first comparator and the second comparator output, respectively, through two diodes is forward biased by the PWM pulse width modulation circuit 604 input terminal 6 is electrically connected to the control circuit; The sampled voltage is less than 5 reference voltage pin, pin 7 of the second comparator outputs a high level control to the PWM control circuit 6 is turned off, no output power; 2 feet higher than the sampled voltage as reference voltage, I is the first comparator output pin to the high level PWM control circuit 6 so that the control is turned off, no output power.
2.根据权利要求1所述的通信电源模块的输入过电压、欠电压保护电路,其特征是:PWM控制电路6由驱动电路601、取样电路602、比较放大电路603、脉宽调制电路604、基准电路605构成,交流电压经交流滤波I进行滤波后输出与桥式整流滤波电路2的输入端电连接,经桥式整流滤波进行输出,桥式整流滤波电路2的输出端经软启动电路3后与功率变换电路4电连接,功率变换电路4的受控端与PWM控制电路6的控制端电连接,PWM控制电路6输入与二次输出整流滤波电路5输出端电连接,由PWM控制电路6的取样电路602检测输出电压波动信号或输出电流波动信号,输出电压波动信号或输出电流波动信号与基准电路605的基准信号一起输入到比较放大电路603的输入端,由比较放大电路603的输出端与脉宽调制电路604的控制端电连接,控制脉宽调制电路604的脉宽,脉宽变化信号经驱动电 The communication according to claim 1 power module input overvoltage, undervoltage protection circuit, characterized in that: PWM control circuit 6 by the driving circuit 601, sampling circuit 602, comparator amplifier 603, a pulse width modulation circuit 604, reference circuit 605 constituted by the AC voltage AC filter for filtering the output I of the bridge rectifier and filter circuit 2 is electrically connected to the input terminal, filter output for bridge rectifier, the output terminal of the bridge rectifier and filter circuit 2 via the soft-start circuit 3 after the power conversion circuit 4 is electrically connected to the control terminal of the power conversion circuit is electrically controlled terminal 4 and the PWM control circuit 6 is connected to the input PWM control circuit 6 and the secondary output rectifier filter circuit 5 is electrically connected to an output terminal, by a PWM control circuit the input sampling circuit 602 detects the output voltage ripple signal or an output current ripple signal, the output voltage fluctuation signal or an output current ripple signal with a reference circuit 605 of the reference signal 6 with the input of the comparator amplifier 603, the output is amplified by the comparator circuit 603 terminal and a control terminal electrically connected to the pulse width modulation circuit 604, a pulse width modulation circuit 604 controls the pulse width of the pulse width modulation signal driving 601放大控制功率变换电路4稳定电压波动或电流波动。 601 controls the power conversion circuit 4 amplifies a stable voltage fluctuations or current fluctuations.
3.根据权利要求1所述的通信电源模块的输入过电压、欠电压保护电路,其特征是:所述的二次输出整流滤波电路5包括续流二极管、储能电感和滤波电容组成。 3. The power module according to a communication input overvoltage, undervoltage protection circuit as claimed in claim wherein: said secondary output rectifier and filter 5 comprises a freewheeling diode, storage inductor and filter capacitors.
4.根据权利要求1所述的通信电源模块的输入过电压、欠电压保护电路,其特征是:所述的软启动保护电路3包括限流电阻R16和电容器C3,限流电阻R16和电容器C3的连接点与功率变换电路的第一输入绕组LI和第二输入绕组L2的连接连接,限流电阻R16另一端与桥式整流滤波电路的输出端电连接,电容器C3与电源负端电连接;当电源接通瞬间,软启动保护电路3开始工作,输入电压经整流桥U和限流电阻R16对电容器C3充电,由于开机时,C3的电压为零,逆变器开机时不能正常工作,限制开机时产生的浪涌电流;当电容器C3充电到约80%额定电压时,逆变器正常工作,经主变压器辅助绕组产生晶闸管Vl的触发信号,使晶闸管导通并短路限流电阻R16,开关电源处于正常运行状态。 4. The communication overvoltage input power module according to claim 1, undervoltage protection circuit, wherein: said soft start protection circuit 3 comprises a current limiting resistor R16 and capacitor C3, the current limiting resistor R16 and capacitor C3 a first input winding LI is a connection point of the power conversion circuit input and a second winding L2 of the connection, the current limiting resistor R16 and the other end of the bridge rectifier and filter circuit electrically connected to the output terminal of capacitor C3 is electrically connected to the negative power supply terminal; when the power is turned on instantly, the soft start protection circuit 3 starts working, by the rectifier bridge input voltage U and current limiting resistor R16 to the capacitor C3 is charged, since the boot, the C3 voltage is zero, does not work when the power inverter, limit power generated when the surge current; when the capacitor C3 is charged to approximately 80% of the rated voltage, the inverter is operating normally, the auxiliary winding generating a trigger signal via the main transformer Vl thyristor, thyristor is turned on and short-circuit current limiting resistor R16, a switch power in normal operation.
5.根据权利要求1所述的通信电源模块的输入过电压、欠电压保护电路,其特征是:第一比较器和第二比较器是LM2904。 5. The communication input power module according to claim 1 overvoltage, undervoltage protection circuit, wherein: the first comparator and the second comparator is an LM2904.
6.根据权利要求1所述的通信电源模块的输入过电压、欠电压保护电路,其特征是:所述的功率变换电路4包括逆变变压器T、开关调整管V2,逆变变压器T包括第一输入绕组LI和第二输入绕组L2和第一输出绕组L3和第二输出绕组L4,第二输入绕组L2的一端与开关调整管V2电连接,开关调整管V2与驱动电路601电连接,驱动电路601控制开关调整管V2导通和关闭时间,开关调整管7电连接有过电流保护电路。 6. The communication overvoltage input power module according to claim 1, undervoltage protection circuit, wherein: the power conversion circuit 4 comprises an inverter transformer T, switching regulator V2, comprising a first inverter transformer T an input winding LI and the second input winding and first output winding L2 L3 L4 and a second output winding, a second winding L2 of the input end of the switching regulator electrically connected to V2, V2 switching regulator circuit 601 is electrically connected to the drive, the drive the regulator circuit 601 controls the switch on and off time of V2, the switching regulator 7 is electrically connected to an overcurrent protection circuit.
7.根据权利要求1所述的通信电源模块的输入过电压、欠电压保护电路,其特征是:过电流保护电路由三极管V2和分压电阻R13、R14组成,电阻R13和R14串接在保护开关调整管Vl的输入端与地之间,电阻R13和R14的连接点与三极管V2基极电连接,三极管V2的发射极与开关调整管Vl的发射极电连接,三极管V2的集电极通过电阻R15与开关调整管Vl的集电极电连接。 7. The communication input power module according to claim 1 overvoltage, undervoltage protection circuit, characterized in that: the overcurrent protection circuit by the transistor V2 and the voltage dividing resistors R13, R14 composed of resistors R13 and R14 connected in series in the protection of Vl between the switching regulator and the input terminal, the connection point of the resistors R13 and R14 connected to the base of the transistor is electrically V2, the emitter of the switching power regulator emitter of transistor Vl V2 is connected to the collector of the triode V2 via a resistor R15 and collector of the switching regulator tube connected to Vl.
8.根据权利要求1所述的通信电源模块的输入过电压、欠电压保护电路,其特征是:开关调整管7电连接有过热保护电路。 8. The communication input power module according to claim 1 overvoltage, undervoltage protection circuit, wherein: the switching regulator 7 is electrically connected to an overheat protection circuit.
9.根据权利要求1所述的通信电源模块的输入过电压、欠电压保护电路,其特征是:过热保护电路包括:电容C、电阻Rr和热晶闸管TT201,电容C、电阻Rr并联后接在热晶闸管TT201的正电极和控制电极之间;热晶闸管TT201正电极接开关调整管基极,热晶闸管TT201的负电极接开关调整管发射极。 9. The communication input power module according to claim 1 overvoltage, undervoltage protection circuit, wherein: an overheat protection circuit comprising: a capacitor C, and the heat resistance Rr thyristor TT201, capacitance C, will be connected in parallel with the resistor Rr TT201 heat between the positive electrode and the control electrode of the thyristor; TT201 positive electrode thyristor heat regulator switch base, thermal negative electrode TT201 thyristor switching regulator emitter.
10.根据权利要求1所述的通信电源模块的输入过电压、欠电压保护电路,其特征是:开关调整管7固定在带散热槽的壳体8上,大功率开关调整管7通过导热绝缘垫9和绝缘衬套10上下与带散热槽的壳体8进行绝缘。 10. The communication input power module according to claim 1 overvoltage, undervoltage protection circuit, wherein: the switching regulator housing 7 is fixed with heat grooves 8, the switching power regulator 7 through thermal insulation pad 9 and the insulating bush 10 and the upper and lower casing with thermal insulation grooves 8.
CN201110423753XA 2011-12-17 2011-12-17 Input overvoltage and under-voltage protection circuit of communication power supply module CN103166194A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201110423753XA CN103166194A (en) 2011-12-17 2011-12-17 Input overvoltage and under-voltage protection circuit of communication power supply module

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201110423753XA CN103166194A (en) 2011-12-17 2011-12-17 Input overvoltage and under-voltage protection circuit of communication power supply module

Publications (1)

Publication Number Publication Date
CN103166194A true CN103166194A (en) 2013-06-19

Family

ID=48589042

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201110423753XA CN103166194A (en) 2011-12-17 2011-12-17 Input overvoltage and under-voltage protection circuit of communication power supply module

Country Status (1)

Country Link
CN (1) CN103166194A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103346548A (en) * 2013-07-05 2013-10-09 苏州贝昂科技有限公司 Discharging monitoring and protecting circuit on high-voltage ion purifier
CN104022634A (en) * 2014-06-30 2014-09-03 中国电子科技集团公司第四十三研究所 Energy-storage capacitor type high-voltage and low-voltage surge suppression circuit and suppression method thereof
CN104582229A (en) * 2013-10-25 2015-04-29 南京普爱射线影像设备有限公司 Protection circuit for filament system of X-ray machine
CN105633905A (en) * 2014-10-27 2016-06-01 深圳市兰丁科技有限公司 Overvoltage and under-voltage protection circuit
CN105932646A (en) * 2016-06-16 2016-09-07 广东欧珀移动通信有限公司 Undervoltage protection circuit and power supply
US9735568B2 (en) 2013-06-04 2017-08-15 Suzhou Beiang Technology Ltd. Ionic wind purifier and discharge monitoring and protective circuit of high-voltage ion purifier

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2245780Y (en) * 1995-11-09 1997-01-22 中国航天工业总公司第五研究院第五一一研究所 Switch voltage-stabilizing power
CN101034798A (en) * 2007-04-06 2007-09-12 广州金升阳科技有限公司 Power convertor output protection circuit
CN201601535U (en) * 2010-01-26 2010-10-06 南昌百特生物高新技术股份有限公司 Blood analyzer circuit lithium battery
CN201781291U (en) * 2010-03-23 2011-03-30 张国豹;赵龙 Direct-current screen storage battery pack current sampling device with shunt replacing Hall element
US7932632B2 (en) * 2005-01-08 2011-04-26 Emerson Network Power Energy Systems Ab Switching power supply with overvoltage protection and overvoltage protection method thereof
CN102280860A (en) * 2011-05-19 2011-12-14 河海大学常州校区 Based on the input protection circuit self-excited converter chip pwm

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2245780Y (en) * 1995-11-09 1997-01-22 中国航天工业总公司第五研究院第五一一研究所 Switch voltage-stabilizing power
US7932632B2 (en) * 2005-01-08 2011-04-26 Emerson Network Power Energy Systems Ab Switching power supply with overvoltage protection and overvoltage protection method thereof
CN101034798A (en) * 2007-04-06 2007-09-12 广州金升阳科技有限公司 Power convertor output protection circuit
CN201601535U (en) * 2010-01-26 2010-10-06 南昌百特生物高新技术股份有限公司 Blood analyzer circuit lithium battery
CN201781291U (en) * 2010-03-23 2011-03-30 张国豹;赵龙 Direct-current screen storage battery pack current sampling device with shunt replacing Hall element
CN102280860A (en) * 2011-05-19 2011-12-14 河海大学常州校区 Based on the input protection circuit self-excited converter chip pwm

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9735568B2 (en) 2013-06-04 2017-08-15 Suzhou Beiang Technology Ltd. Ionic wind purifier and discharge monitoring and protective circuit of high-voltage ion purifier
CN103346548A (en) * 2013-07-05 2013-10-09 苏州贝昂科技有限公司 Discharging monitoring and protecting circuit on high-voltage ion purifier
CN103346548B (en) * 2013-07-05 2015-11-25 苏州贝昂科技有限公司 Electric discharge monitoring and protecting circuit in a kind of high-voltage ion purifier
CN104582229A (en) * 2013-10-25 2015-04-29 南京普爱射线影像设备有限公司 Protection circuit for filament system of X-ray machine
CN104022634B (en) * 2014-06-30 2016-06-29 中国电子科技集团公司第四十三研究所 A kind of storage capacitor formula high and low pressure surge restraint circuit and suppressing method thereof
CN104022634A (en) * 2014-06-30 2014-09-03 中国电子科技集团公司第四十三研究所 Energy-storage capacitor type high-voltage and low-voltage surge suppression circuit and suppression method thereof
CN105633905A (en) * 2014-10-27 2016-06-01 深圳市兰丁科技有限公司 Overvoltage and under-voltage protection circuit
CN105932646A (en) * 2016-06-16 2016-09-07 广东欧珀移动通信有限公司 Undervoltage protection circuit and power supply

Similar Documents

Publication Publication Date Title
TWI290405B (en) Inrush current control circuit
CN2376121Y (en) Temperature control switch controlled holding charging circuit for wide voltage changing range
US5886892A (en) Power supply with improved inrush circuit for limiting inrush current
CN1153324C (en) Auxiliary power
CN201318651Y (en) Led lights circuit
CN101582580B (en) Input/output over-voltage protection circuit
CN101742783B (en) High power LED drive circuit with emergency function
CN103248108A (en) LED (Light Emitting Diode) driver with MOS (Metal Oxide Semiconductor) tube switching module and reusable DC (Direct Current)-DC (Direct Current) module
CN201590645U (en) AC input over-voltage and under-voltage protection device for electric apparatus
CN101714750B (en) LED protecting chip based on PWM shunt
CN102638114A (en) Power supply device of current transformer
CN201986215U (en) High-power light emitting diode (LED) isolation type driving power supply
CN201393056Y (en) Protection and detection device of inverter
CN101594047B (en) Simple power-on surge suppression circuit
CN101378187B (en) Power supply protection circuit
CN201230282Y (en) Auxiliary electric source actuating apparatus for solar photovoltaic combining inverter
CN102858049A (en) Over-current protection sampling circuit, light-emitting diode (LED) drive circuit and LED lamp
CN101034798A (en) Power convertor output protection circuit
CN201127137Y (en) Power led drive circuit
CN102711309A (en) LED (Light Emitting Diode) driving circuit and lamp
CN201656760U (en) Surge-prevention soft starting circuit
CN2728096Y (en) FET automotive alternator voltage regulator with multiple protective functions
CN2096775U (en) Efficiency high-pow switch power using mosfet
CN101867214B (en) Charging circuit and charger
CN202309020U (en) Intelligently-controlled input overvoltage protection circuit and switch power source adopting same

Legal Events

Date Code Title Description
C06 Publication
RJ01