CN100487995C - Short-circuit protective circuit - Google Patents

Short-circuit protective circuit Download PDF

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CN100487995C
CN100487995C CN 01138095 CN01138095A CN100487995C CN 100487995 C CN100487995 C CN 100487995C CN 01138095 CN01138095 CN 01138095 CN 01138095 A CN01138095 A CN 01138095A CN 100487995 C CN100487995 C CN 100487995C
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circuit
short
current
level
threshold
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CN1430314A (en
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王满堂
旭 甘
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中兴通讯股份有限公司
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Abstract

一种短路保护电路,涉及开关电源领域,本发明包括延时电路、短路电流阈值设定电路、短路过流检测电路以及滞回电路;其中:延时电路,用于将PWM开关电源的主功率回路输出的电流取样电平保持一段时间并缓慢下降,成为一个连续的信号;电流阈值设定电路,用于产生阈值电平;过流检测电路,用于比较延时电路输出的电流取样电平与电流阈值设定电路所产生的阈值电平并判断;滞回电路,形成窗式比较电路,延长发出短路保护信号到下次恢复正常工作的时间;并将输出的短路保护信号反馈到阈值设定电路,使得电流阈值设定电路降低阈值电平,并增强过流检测电路的抗干扰能力;本发明由于延时和滞回功能的引入,有效地降低短路保护时开关电源的工作电流和损耗,提高可靠性。 One kind of short-circuit protection circuit, relates to the field of switching power supply, the present invention includes a delay circuit, the short circuit current threshold setting circuit, a short circuit and overcurrent detection hysteresis circuit; wherein: a delay circuit for switching the main power supply PWM current sampling circuit output level for a time and slowly lowered, to become a continuous signal; a current threshold setting circuit for generating a threshold level; overcurrent detection circuit for detecting a current level comparison sample delay circuit output threshold level and the current threshold setting circuit generates and determination; hysteresis circuit, forming a window comparator circuit, to extend the time sent short circuit protection signal to the next resume normal work; and short circuit protection signal output is fed back to the threshold value provided given circuit, such that the threshold value setting circuit reduces the current threshold level, and to enhance the anti-jamming capability over-current detection circuit; the present invention, since the introduction of delay and hysteresis function, effectively reducing the switching power supply short-circuit current and loss protection and improve reliability.

Description

一种短路保护电路 One kind of short-circuit protection circuit

技术领域 FIELD

本发明涉及开关电源领域,具体涉及电流型脉宽调制(PWM)开关电源。 The present invention relates to a switching power supply, particularly to a current mode pulse width modulation (PWM) switching power supply.

背景技术 Background technique

目前开关电源的应用越来越广泛,在开关电源的保护功能中,一般都需要短路保护电路,以防止开关电源在短路时工作电流过大而损坏电源以及负载。 Currently more and more extensive application of a switching power supply, the switching power supply protection, short circuit protection circuit is generally required in order to prevent excessive current switching power supply when a short circuit and damage the power supply and a load. 而短路保护电路性能的好坏直接影响着整个电源的可靠性。 Short-circuit protection circuit is good or bad performance directly affects the reliability of the power supply. 目前,开关电源中的短路保护电路大都采用脉宽调制芯片内部的电流峰值限制电路来检测变压器原边的工作电流,限制其峰值来达到短路保护的功能。 Currently, the short protection circuit of the switching power supply using the most current peak internal pulse width modulator chip limiting circuit to detect the transformer primary current, peak limiting short-circuit protection function is achieved. 由于这种方案只是限制主回路的电流峰值,在短路状态下一直频繁保护与恢复,主回路的工作电流仍然很大,存在着开关电源短路输出残余电压高,损耗大,可靠性低的问题。 Since this embodiment merely limits the peak current in the main circuit protection and restoration has been frequently in a short circuit condition, the operating current of the main circuit is still large, there is a short circuit the switching power supply outputs a high residual voltage, high loss, low reliability.

美国专禾U US5,400,206 "Short circuit and overload protection circuit which allows a predetermined number of reconnection attempts"中米用了一种可预设短路试尝恢复次数的短路保护电路,使用一个可设置计数器来限制短路试尝恢复次数及时间的电路,当保护动作超过一定设置数后,保护装置锁死, 一直处于保护状态,这种方案能够解决开关电源短路损耗大的问题,但是在短路去除后不能够自动恢复,而需要 U.S. Patent Wo U US5,400,206 "Short circuit and overload protection circuit which allows a predetermined number of reconnection attempts" in rice with a predeterminable short-circuit recovery times taste test of short-circuit protection circuit, use a counter to limit the short circuit may be provided taste test of frequency and timing recovery circuit, when the protection setting operation exceeds a certain number, lock protection device, has been in a state of protection, this embodiment can solve a large short-circuit switching power loss problem, but can not automatically restored after the short circuit is removed and need

3手动重置。 3 manually reset. 发明内容 SUMMARY

本发明所要解决的技术问题是克服现有技术的缺点,提出一种短路保护电路,以降低短路保护时开关电源的工作电流和损耗,提高电源的可靠性,并能够在短路去除后自动恢复工作。 The present invention solves the technical problem is to overcome the disadvantages of the prior art, to provide a short-circuit protection circuit, when the switching power supply to reduce the operating current and short-circuit protection loss and improve the reliability of the power supply, and automatically resumes the operation when the short circuit is removed .

本发明的技术方案如下:包括延时电路、短路电流阈值设定电路、 短路过流检测电路以及滞回电路;其中: Aspect of the present invention is as follows: a delay circuit, the short circuit current threshold setting circuit, a short circuit and overcurrent detection hysteresis circuit; wherein:

延时电路,用于将PWM开关电源的主功率回路输出的电流取样电平保持一段时间(该时间由电源的应用环境决定)并缓慢下降,成为一个连续的信号; Delay circuit, the output current of the main power circuit for a PWM switching sampled level held for a period of time (determined by the power of the application environment) and slowly lowered, to become a continuous signal;

短路电流阈值设定电路,用于产生阈值电平; The short circuit current threshold setting circuit for generating a threshold level;

短路过流检测电路,用于比较延时电路输出的电流取样电平与短路电流阈值设定电路所产生的阈值电平并判断;当电流取样电平超过设定的阈值电平时,产生短路保护信号;当电流取样电平下降到低于阈值电平后,撤销短路保护信号; Short-circuit overcurrent detection circuit, a threshold level of the current sampled level with the short-circuit current output of the delay circuit threshold value setting circuit, and the generated determination; the threshold level when the current level exceeds the set sampling, short circuit protection signal; sampled level when the current drops below the threshold level, the revocation short circuit protection signal;

滞回电路,形成窗式比较电路,延长发出短路保护信号到下次恢复正常工作的时间;并将输出的短路保护信号反馈到短路电流阈值设定电路,使得短路电流阈值设定电路降低阈值电平,并增强短路过流检测电路的抗干扰能力。 Hysteresis circuit, forming a window comparator circuit, short circuit protection signal is sent to extend the time until the next normal working; short circuit protection signal and outputs the short-circuit current is fed back to the threshold setting circuit, short-circuit current such that the threshold value setting circuit reduces the threshold flat, and to enhance the anti-interference ability of the short-circuit overcurrent detection circuit.

短路保护信号可用来控制脉宽调制芯片的供电,或者拉低脉宽调制芯片的电压反馈端,停止开关电源的工作。 The short circuit protection signal used to control the power supply pulse width modulation chips, or down pulse width modulation voltage feedback terminal of the chip, the switching power supply is stopped. 短路保护后,延时电路所输出的电流取样电平处于在不断的缓慢下降过程中,当下降到低于阈值电平后,过流检测电路撤销短路保护信号,开关电源尝试恢复工 After the short circuit, the delay circuit output current is continuously sampled level slowly decreasing process, after the current falls below a threshold level, the short-circuit overcurrent protection signal detection circuit revoked, attempts to recover the power switching station

作;如果开关电源还处于短路状态,本发明的保护电路又重复短路保护过程,转入保护状态,如果开关电源的短路已经去除,则本保护电路停止输出短路保护信号,恢复开关电源的正常工作状态。 For; If the switch is still in the power supply short-circuited state, the protection circuit of the present invention repeated short-circuit protection process, into protected state, if the short-circuit switching power supply has been removed, the protection circuit stops this output short circuit protection signal to restore normal operation of the switching power supply status.

采用本发明所提供的装置,与背景技术部分提到的依靠脉宽调制芯片内部的电流峰值限制电路来进行短路保护的方案相比,由于延时和滞回功能的引入,有效地降低了短路保护时开关电源的工作电流和损耗,提高了电源装置的可靠性。 Using the apparatus provided by the present invention, as compared with relying on the current pulse width modulation chip peak internal limiting circuit to short-circuit protection scheme Background section above, since the introduction of delay and hysteresis function, effectively reducing the short-circuit protection of the switching power supply when the current consumption and improve the reliability of the power supply device.

附图说明 BRIEF DESCRIPTION

图1是本发明的原理框图。 FIG. 1 is a block diagram of the present invention.

图2是实现本发明装置的具体电路图。 FIG 2 is a circuit diagram of a specific implementation of the invention apparatus.

具体实施方式 Detailed ways

下面结合图l、 2对本发明作进一步说明: Below in connection with FIG. L, 2 of the present invention is further described:

由图2中的第一个电容Cl和电阻R2组成的并联支路跨接在二极管VD1的阴极和地之间构成了延时电路101;第二电容C2和电阻R4组成的并联支路与电阻R5串联后跨接在VREF电源端和地之间构成了阈值设定电路102;滞回电路104可由电阻R3实现;短路过流检测电路103可比较器D1实现; A first capacitor Cl and a resistor R2 in FIG. 2 consisting of parallel branch is connected across the diode VD1 and the cathode constitute a delay circuit 101; the second capacitor C2 and the resistor R4 and the parallel branch consisting of a resistor after R5 serially connected across the power supply terminal and VREF constitute the threshold value setting circuit 102; hysteresis circuit 104 may be implemented a resistor R3; short-circuit overcurrent detection comparator circuit 103 may be implemented D1;

VCC端口为比较器D1供电并提供上拉电平,D1为集电极开路的比较器,通过上拉电阻R1接VCC端口,如果使用非集电极开路的比较器或者运放时,上拉电阻R1可以去掉; VCC power port and the comparator D1 to provide a level-up level, D1 is an open collector comparator, to VCC through pull-up resistor R1 port, if using a non-open-collector comparator or operational amplifier, the pull-up resistor R1 It can be removed;

VREF为稳定直流电压,用于给电流阈值设定电路102供电; 延时电路101中的二极管VD1的阳极连接到开关电源100的主功率回路电流取样电阻或者电流互感器上,图2中是从PWM开关电源的主功率回路中的电流取样电阻R6上取得该回路的电流取样信号, 该信号经过延时电路101后,即使R6上的电流取样信号消失,由于延时电路101中Cl的积分作用,电流取样电平也能保持一段时间并缓慢下降,电流取样电平送入过流检测电路103,和电流阈值设定电路102产生的阈值电平在过流检测电路103中的比较器D1处进行比较判断,当Cl上的电流取样电平超过设定的阈值电平时,Dl产生短路保护信号,输出低电平,由于滞回电路R3的作用,形成窗式比较电路,延长了短路保护到再次恢复正常工作的时间。 VREF is set to a stable DC voltage to the current threshold for the power supply circuit 102; an anode of the diode VD1 delay circuit 101 is connected to the main power supply switch circuit current sampling resistor or a current transformer 100, FIG. 2 is acquires the loop current sense resistor R6 on the PWM power supply of the main power switching circuit current sampling signal which after a delay circuit 101, even if the current sampling signal on R6 disappear, since the integral action of the delay circuit 101 Cl current sampled level can be maintained for a period of time and slowly decrease and the current sampled level into the over-current detection circuit 103, the threshold level and the current threshold setting circuit 102 generates D1 of the comparator in the over-current detection circuit 103 comparing judgment, when the current threshold level on the sampled level exceeds the set usually Cl, Dl short circuit protection signal, outputs a low level, due to the effect of the hysteresis circuit R3 to form a window comparator circuit, the short circuit protection to prolong recovery time to work again. 短路保护信号CTL在保护状态时为低电平,可用于驱动三极管或MOS管控制PWM 芯片的供电,也可以用来拉低脉宽调制芯片的电压反馈端(如COM 端),停止开关电源的工作,直到Cl放电到R3、 R4、 R5产生的恢复阈值,比较器才翻转,输出为高阻态,恢复脉宽调制电路的正常工作。 Short circuit protection in the protection status signal CTL is low, MOS transistor may be used to control the drive transistor PWM chip supply may also be used to pull down the voltage feedback terminal of the pulse width modulation chip (such as COM terminal), or the power supply stop switch work, until the Cl discharge recovery threshold, the comparator R3, R4, R5 produced was inverted, the output high impedance state, to resume normal operation of the pulse width modulation circuit.

其中,延时电路101中的C1和R2的取值应该大一些,这样使延时时间长一些,对降低短路保护时的电源损耗有积极作用; Wherein the delay circuit 101 in the value of C1 and R2 should be larger, so that a number of the long delay time, has a positive effect on power consumption is reduced when a short-circuit protection;

滞回电路R3影响阈值设定电路102所产生的阈值电压的降低程度,阻值越小,滞回作用越强烈,阈值电压的降低程度越大,短路保护到恢复的时间也越长。 The degree of lowering the threshold voltage of the hysteresis circuit R3 affect the threshold setting circuit 102 is generated, the smaller the resistance, the more intense the hysteresis effect, the greater the degree of reduction of the threshold voltage, short circuit protection to the longer recovery time. 本文所公开的具有延时和滞回功能的短路保护控制电路可广泛用于各类开关电源系统中,特别是对电源短路保护时损耗小,可靠性高的场合。 The short circuit protection control circuit having hysteresis delay and functions disclosed herein can be used in various types of switching power supply system, in particular the power dissipation on a small short-circuit protection, high reliability applications.

Claims (1)

1、一种短路保护电路,包括延时电路(101)、短路电流阈值设定电路(102)、短路过流检测电路(103)以及滞回电路(104);所述的延时电路(101),用于将PWM开关电源的主功率回路输出的电流取样电平保持一段时间并缓慢下降,成为一个连续的信号;所述的短路电流阈值设定电路(102),用于产生阈值电平;所述的短路过流检测电路(103),用于比较延时电路(101)输出的电流取样电平与短路电流阈值设定电路(102)所产生的阈值电平并判断;当电流取样电平超过设定的阈值电平时,产生短路保护信号;当电流取样电平下降到低于阈值电平后,撤销短路保护信号;所述的滞回电路(104),形成窗式比较电路,延长发出短路保护信号到下次恢复正常工作的时间;并将输出的短路保护信号反馈到短路电流阈值设定电路,使得短路电流阈值设定电路降低阈值电平,并增强短路过流 A short circuit protection circuit comprising a delay circuit (101), the short circuit current threshold setting circuit (102), the short-circuit overcurrent detection circuit (103) and a hysteresis circuit (104); the delay circuit (101 ), sampled current power level of the main circuit switching power supply PWM output for a period of time and slowly lowered, to become a continuous signal; the short circuit current threshold setting circuit (102) for generating a threshold level ; current sampling level of the short-circuit current threshold short circuit overcurrent detection circuit (103) for comparing the delay circuit (101) output from the setting circuit (102) threshold level and determines the generated; when the current sampling threshold level exceeds the set level, a short circuit protection signal; sampling when the current level falls below the threshold level, the revocation short circuit protection signal; said hysteresis circuit (104), forming a window comparator circuit, prolonged protection signal sent to the next short-circuit recovery time of normal operation; short circuit protection signal and outputs the short-circuit current is fed back to the threshold setting circuit, short-circuit current such that the threshold value setting circuit reduces the threshold level, and to enhance the short-circuit overcurrent 测电路的抗干扰能力,所述的滞回电路(104)由电阻实现,该电阻的一端与所述的短路电流阈值设定电路(102)的输出端及所述短路过流检测电路(103)的输入端相连,另一端与所述短路过流检测电路(103)的输出端相连。 Anti-interference ability of the sensing circuit, said hysteresis circuit (104) implemented by a resistor, an output terminal of said one end of the resistor short-circuit current threshold setting circuit (102) and the short-circuit overcurrent detection circuit (103 connected) is connected to the input terminal, the other end of the short-circuit overcurrent detection circuit (103) output.
CN 01138095 2001-12-31 2001-12-31 Short-circuit protective circuit CN100487995C (en)

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CN2045902U (en) 1987-12-05 1989-10-11 淮南矿务局 Phase sensitized short circuit protection feeding switch
CN1084279A (en) 1992-09-14 1994-03-23 中国科学技术大学 High voltage megohm meter with delay short circuit protection

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014070835A3 (en) * 2012-10-30 2014-07-17 General Electric Company System and method for over-current protection
US9825518B2 (en) 2012-10-30 2017-11-21 Ge Energy Power Conversion Technology Ltd System and method for over-current protection
CN103618293A (en) * 2013-11-27 2014-03-05 华为技术有限公司 Three-level circuit short-circuit protection method and device and three-level circuit

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