CN103138716A - Power down triggered monostable protection circuit - Google Patents
Power down triggered monostable protection circuit Download PDFInfo
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- CN103138716A CN103138716A CN2013100378843A CN201310037884A CN103138716A CN 103138716 A CN103138716 A CN 103138716A CN 2013100378843 A CN2013100378843 A CN 2013100378843A CN 201310037884 A CN201310037884 A CN 201310037884A CN 103138716 A CN103138716 A CN 103138716A
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Abstract
本发明公开了一种掉电触发的单稳态保护电路，包括：用以存储操作电能的储能模块；基准电压模块，连接储能模块输出端，用以输出基准电压；掉电触发模块，分别连接掉电信号端和储能模块，在有掉电触发信号后输出一个的触发脉冲；比较模块，其两个输入端分别连接基准电压模块和掉电触发模块的输出端，将基准电压和触发脉冲做比较，根据比较结果比较模块输出端输出一个用以控制受控电路的控制脉冲。本发明在工作电源掉电后提供一个延时控制脉冲，禁止电源系统或其他用电设备短时关机又马上重启，有效地避免了开机时序错误；且电路简单可靠，成本低廉，具有广阔的市场前景。
The invention discloses a monostable protection circuit triggered by power failure, comprising: an energy storage module for storing operating electric energy; a reference voltage module connected to the output end of the energy storage module for outputting a reference voltage; a power failure trigger module, Connect the power-down signal terminal and the energy storage module respectively, and output a trigger pulse after there is a power-down trigger signal; the two input terminals of the comparison module are respectively connected to the reference voltage module and the output terminal of the power-down trigger module, and compare the reference voltage and The trigger pulse is compared, and the output terminal of the comparison module outputs a control pulse for controlling the controlled circuit according to the comparison result. The present invention provides a delay control pulse after the working power supply is powered off, prohibits the short-term shutdown of the power supply system or other electrical equipment and restarts immediately, effectively avoids the sequence error of starting up; and the circuit is simple and reliable, low in cost, and has a broad market prospect.
Description
Technical field
The present invention relates to protective circuit, relate in particular to a kind of monostable protective circuit, control impuls of its upset output of being triggered after system power failure is used for guaranteeing resetting of circuit in system.
Background technology
Power-supply system or other power consumption equipments are in operation, exist electrical network or prime power supply circuits due to fault the situation of interruption of power supply in short-term, i.e. power-supply system or power consumption equipment input is fallen in short-term.In this case, may cause some in power-supply system or the power down of power consumption equipment internal work voltage of operation, after input voltage fell in short-term and recovers, the dysfunction situations such as energy pours in down a chimney appearred in the sequential mistake that may cause starting shooting, power-supply system, even jeopardize reliability.This problem need to consider that power-supply system or power consumption equipment still can carry out necessary time-delay after the power down of internal work voltage, makes inner all circuit resets to one controlled state, just allows to restart.
Summary of the invention
The present invention is the problems referred to above that will solve prior art, propose a kind of fall in short-term (working power power down) at input voltage after, a time-delay control impuls can be provided, forbid that power-supply system or other power consumption equipments shut down in short-term and restart at once.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is the monostable protective circuit that a kind of power down of design triggers, and comprising: energy-storage module, and its input connects working power, in order to the storage operation electric energy; The reference voltage module connects the energy-storage module output, in order to output reference voltage; The power down trigger module connects respectively power-off signal end and energy-storage module, exports the trigger impulse of after the power down triggering signal is arranged; Comparison module, two input connects respectively the output of reference voltage module and power down trigger module, and reference voltage and trigger impulse are compared, and exports one in order to control the control impuls of controlled circuit according to comparative result comparison module output.
Be connected in series one in order to amplify the output module of described control impuls between comparison module output and controlled circuit.
Above-mentioned energy-storage module comprises the second diode and the 3rd electric capacity that is serially connected in successively between working power and ground, and wherein the anodic bonding working power of the second diode, negative electrode connection the 3rd electric capacity and this tie point are as the energy-storage module output.
The said reference voltage module can be for being serially connected in the 8th resistance and the 9th resistance between described energy-storage module output and ground, the described reference voltage of tie point output of the 8th resistance and the 9th resistance.
The said reference voltage module also can be for being serially connected in the voltage stabilizing chip between described energy-storage module output and ground, the described reference voltage of voltage stabilizing chip output.
Above-mentioned power down trigger module comprises triode, its base stage connects described power down triggering signal end by the first resistance and first electric capacity of series connection, grounded emitter, the first diode in parallel and the second resistance between base stage and emitter, be connected in series the 3rd resistance and the 4th resistance between collector electrode and described energy-storage module output, be connected in series the second electric capacity and the described trigger impulse of this tie point output between the tie point of the 3rd resistance and the 4th resistance and ground.
Above-mentioned comparison module comprises comparator, the described trigger impulse of its inverting input access, and in-phase input end connects described reference voltage by the 6th resistance, connects the 5th resistance between in-phase input end and output, and output is carried described control impuls.
Above-mentioned output module is field effect transistor, and its grid connects the output of described comparison module, source ground, and control circuit is accepted in drain electrode.
Compared with prior art, the present invention provides a time-delay control impuls after the working power power down, forbid that power-supply system or other power consumption equipments shut down in short-term and restart, effectively avoided start sequential mistake, power-supply system the dysfunction situations such as energy pours in down a chimney to occur at once.And circuit is simple and reliable, only needs pcb board face seldom, and components and parts all can adopt general-purpose device at a low price, and are with low cost, have wide market prospects.
Description of drawings
Below in conjunction with drawings and Examples, the present invention is made detailed explanation, wherein:
Fig. 1 is the functional block diagram of preferred embodiment of the present invention;
Fig. 2 is the circuit diagram of preferred embodiment of the present invention;
Fig. 3 is the oscillogram of preferred embodiment of the present invention.
Embodiment
The present invention has disclosed the monostable protective circuit that a kind of power down triggers, and referring to Fig. 1, it comprises energy-storage module connected to one another, reference voltage module, power down trigger module, comparison module.Wherein:
The input of energy-storage module connects working power, in order to the storage operation electric energy.When working power was set up, working power was charged to energy-storage module, and after the working power power down, energy-storage module provides electric energy only for comparison module, reference voltage module and output module.
The reference voltage module connects the energy-storage module output, in order to output reference voltage.Reference voltage determines the roll over condition of output delay pulse.
The power down trigger module connects respectively power-off signal end and energy-storage module, exports the trigger impulse of after the power down triggering signal is arranged.It may be noted that the power down triggering signal sent by the power-fail detection circuit of power-supply system or power consumption equipment, send this signal in the time of in the time of both can being power down can being also shutdown.
Comparison module, two input connects respectively the output of reference voltage module and power down trigger module, and reference voltage and trigger impulse are compared, and exports one in order to control the control impuls of controlled circuit according to comparative result comparison module output.Comparison module can be made of the device of the high input impedances such as amplifier or comparator, reference voltage and trigger impulse is compared generation monostable delay pulse (being control impuls), and have certain return difference, prevents output jitter.
Be connected in series one in order to amplify the output module of described control impuls between comparison module output and controlled circuit in preferred embodiment.Output module also can carry out reversal to control impuls, increase driving force or change the processing such as output timing, and the control impuls of amplification can connect the control signal interface that the startup of controlled circuit (as power-supply system or power consumption equipment) enables.When control impuls arrived, controlled circuit can't start, and protection power source system or power consumption equipment short time power down or shutdown are restarted again at once by this, have effectively avoided start sequential mistake.
Referring to the preferred embodiment shown in Fig. 2, energy-storage module comprises the second diode D2 and the 3rd capacitor C 3 that is serially connected in successively between working power VCCP and ground, and wherein the anodic bonding working power of the second diode, negative electrode connection the 3rd electric capacity and this tie point are as the energy-storage module output.The unidirectional isolation of energy-storage module and working power, so-called unidirectional isolation refer to that energy-storage module is connected by diode with working power, only absorb energy from working power, and not to other circuit that are connected on working power energy of releasing.
Referring to the preferred embodiment shown in Fig. 2, the reference voltage module is the 8th resistance and the 9th resistance that is serially connected between described energy-storage module output and ground, the described reference voltage of tie point output of the 8th resistance and the 9th resistance.The terminal of reference voltage is Vref, and the 8th resistance and the 9th resistance are not drawn.
Referring to the preferred embodiment shown in Fig. 2, the reference voltage module is the voltage stabilizing chip that is serially connected between described energy-storage module output and ground, the described reference voltage of voltage stabilizing chip output.The terminal of reference voltage is Vref, and the voltage stabilizing chip is not drawn.
Referring to the preferred embodiment shown in Fig. 2, the power down trigger module comprises triode Q1, its base stage connects described power down triggering signal end (input terminal of triggering signal is Trigger) by the first resistance R 1 and first capacitor C 1 of series connection, grounded emitter, the first diode D1 in parallel and the second resistance R 2 between base stage and emitter, be connected in series the second capacitor C 2 and the described trigger impulse of this tie point output between the tie point that is connected in series the 3rd resistance R 3 and the 4th resistance R 4, the three resistance and the 4th resistance between collector electrode and described energy-storage module output and ground.
Referring to the preferred embodiment shown in Fig. 2, comparison module comprises comparator U1, its inverting input access described trigger impulse (tie point that namely connects R3, R4), in-phase input end meets described reference voltage V ref by the 6th resistance R 6, connect the 5th resistance R 5 between in-phase input end and output, output is carried described control impuls.
Referring to the preferred embodiment shown in Fig. 2, output module is field effect transistor Q2, and its grid connects the output of described comparison module, source ground, and control circuit is accepted in drain electrode.
Fig. 3 shows the oscillogram of preferred embodiment, above a line be the power down triggering signal, below a line be control impuls.
Below in conjunction with Fig. 2 and Fig. 3 in detail, this circuit working principle is described in detail.In figure, D1 and C3 consist of energy-storage module, and VCCP is working power, and its can fall and power down with input power.Voltage identification after diode D1 isolation is VCC.Vref is the constant reference voltage that is produced by devices such as electric resistance partial pressure or voltage stabilizing chips by VCC.Q1, R1, C1, D1, R2, R3, R4, C2 consist of the power down circuits for triggering, and U1, R6, R5 consist of comparison module, and Q2 consists of output module.The Trigger signal is the high level signal of power-fail detection circuit output in power-supply system or power consumption equipment,, with conducting Q1 once, then turn-offs from the low rising edge that uprises at this level.After the Q1 conducting, to the C2 discharge of module relatively once, during lower than U1 in-phase end voltage, U1 exports high level, and makes the Q2 conducting of output circuit when C2 voltage, and control impuls is low level.After C2 discharge, VCC charges to C2 by R4, and C2 voltage is raise, when C2 voltage during higher than U1 in-phase end voltage, and the U1 output low level, namely output circuit Q2 pipe turn-offs.The A point output waveform of Q2 as shown in Figure 3, wherein low level time T is determined by the time constant of R4, C2, the voltage amplitude of time delayed signal is determined by external circuit.The A point of Q2 is used for starting with power-supply system or power consumption equipment the control interface that enables and is connected, and forbids in the time that at T power-supply system or power consumption equipment restart, thereby guarantees enough resetting times.
More than the embodiment of the control impuls of an output low level of this patent just, remove Q2(and namely remove output module), the control impuls of directly exporting high level also belongs to this patent protection range.
Above embodiment is only for illustrating, non-providing constraints.Anyly do not break away from the application's spirit and category, and to its equivalent modifications of carrying out or change, all should be contained among the application's claim scope.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310037884.3A CN103138716B (en) | 2013-01-31 | 2013-01-31 | The monostable protection circuit that a kind of power down triggers |
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| CN201310037884.3A CN103138716B (en) | 2013-01-31 | 2013-01-31 | The monostable protection circuit that a kind of power down triggers |
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| CN103138716A true CN103138716A (en) | 2013-06-05 |
| CN103138716B CN103138716B (en) | 2015-08-12 |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016015538A1 (en) * | 2014-07-28 | 2016-02-04 | 无锡华润上华半导体有限公司 | Brown out detector having sequential control function |
| CN105356863A (en) * | 2015-09-29 | 2016-02-24 | 贵州剑星科技有限公司 | Fast recovery detection delay circuit with monostable characteristic |
| CN110159520A (en) * | 2019-06-28 | 2019-08-23 | 大唐半导体科技有限公司 | A kind of control circuit of air compressor machine |
| CN110501553A (en) * | 2018-05-17 | 2019-11-26 | 中兴通讯股份有限公司 | A kind of power failure warning circuit |
| CN110535336A (en) * | 2019-09-26 | 2019-12-03 | 重庆市亿飞智联科技有限公司 | Delay switch driving circuit and system |
| CN110794196A (en) * | 2018-08-01 | 2020-02-14 | 中兴通讯股份有限公司 | Alternating current power failure detection method and device and communication equipment |
| CN111670527A (en) * | 2019-01-09 | 2020-09-15 | 深圳市大疆创新科技有限公司 | Discharging circuit for distance measuring device, distributed radar system and movable platform |
| CN111813037A (en) * | 2020-06-11 | 2020-10-23 | 中国长城科技集团股份有限公司 | Starting-up control method, starting-up control device and electronic equipment |
| CN111834983A (en) * | 2020-08-03 | 2020-10-27 | 芯河半导体科技(无锡)有限公司 | Circuit, method and device for preventing false triggering through IO control of SOC (System on chip) |
| CN112083784A (en) * | 2020-07-23 | 2020-12-15 | 广西电网有限责任公司电力科学研究院 | Power-down time sequence circuit of power distribution terminal |
| CN113484589A (en) * | 2021-06-30 | 2021-10-08 | 杭州加速科技有限公司 | Power-off detection circuit with hysteresis function and control system |
| CN113741252A (en) * | 2021-08-19 | 2021-12-03 | 武汉光迅科技股份有限公司 | Power-off time sequence control circuit of multi-power-supply system |
| WO2022021848A1 (en) * | 2020-07-25 | 2022-02-03 | 苏州浪潮智能科技有限公司 | Sequence control circuit for enhancing reliability in abnormal power failure scenario and control method thereof |
| CN115955227A (en) * | 2021-10-08 | 2023-04-11 | 广东省智能机器人研究院 | Time delay circuit and extreme ultraviolet photoetching light source |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10254353B2 (en) | 2014-07-28 | 2019-04-09 | Csmc Technologies Fabi Co., Ltd. | Brown out detector having sequential control function |
| WO2016015538A1 (en) * | 2014-07-28 | 2016-02-04 | 无锡华润上华半导体有限公司 | Brown out detector having sequential control function |
| CN105356863A (en) * | 2015-09-29 | 2016-02-24 | 贵州剑星科技有限公司 | Fast recovery detection delay circuit with monostable characteristic |
| CN105356863B (en) * | 2015-09-29 | 2018-04-13 | 贵州剑星科技有限公司 | A kind of fast recovery detection delay circuit with monostable step response |
| CN110501553A (en) * | 2018-05-17 | 2019-11-26 | 中兴通讯股份有限公司 | A kind of power failure warning circuit |
| CN110794196A (en) * | 2018-08-01 | 2020-02-14 | 中兴通讯股份有限公司 | Alternating current power failure detection method and device and communication equipment |
| CN111670527A (en) * | 2019-01-09 | 2020-09-15 | 深圳市大疆创新科技有限公司 | Discharging circuit for distance measuring device, distributed radar system and movable platform |
| CN111670527B (en) * | 2019-01-09 | 2024-06-11 | 深圳市大疆创新科技有限公司 | Discharge circuit for distance measuring device, distributed radar system and movable platform |
| CN110159520A (en) * | 2019-06-28 | 2019-08-23 | 大唐半导体科技有限公司 | A kind of control circuit of air compressor machine |
| CN110159520B (en) * | 2019-06-28 | 2020-09-29 | 大唐半导体科技有限公司 | Control circuit of air compressor |
| CN110535336A (en) * | 2019-09-26 | 2019-12-03 | 重庆市亿飞智联科技有限公司 | Delay switch driving circuit and system |
| CN111813037A (en) * | 2020-06-11 | 2020-10-23 | 中国长城科技集团股份有限公司 | Starting-up control method, starting-up control device and electronic equipment |
| CN112083784A (en) * | 2020-07-23 | 2020-12-15 | 广西电网有限责任公司电力科学研究院 | Power-down time sequence circuit of power distribution terminal |
| WO2022021848A1 (en) * | 2020-07-25 | 2022-02-03 | 苏州浪潮智能科技有限公司 | Sequence control circuit for enhancing reliability in abnormal power failure scenario and control method thereof |
| US11658509B2 (en) | 2020-07-25 | 2023-05-23 | Inspur Suzhou Intelligent Technology Co., Ltd. | Sequence control circuit for enhancing reliability in case of abnormal power-down and control method thereof |
| CN111834983A (en) * | 2020-08-03 | 2020-10-27 | 芯河半导体科技(无锡)有限公司 | Circuit, method and device for preventing false triggering through IO control of SOC (System on chip) |
| CN113484589A (en) * | 2021-06-30 | 2021-10-08 | 杭州加速科技有限公司 | Power-off detection circuit with hysteresis function and control system |
| CN113741252A (en) * | 2021-08-19 | 2021-12-03 | 武汉光迅科技股份有限公司 | Power-off time sequence control circuit of multi-power-supply system |
| CN115955227A (en) * | 2021-10-08 | 2023-04-11 | 广东省智能机器人研究院 | Time delay circuit and extreme ultraviolet photoetching light source |
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