CN101820274A - Sparkless safety switch, socket and safety power on-off method - Google Patents

Sparkless safety switch, socket and safety power on-off method Download PDF

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Publication number
CN101820274A
CN101820274A CN 201010151136 CN201010151136A CN101820274A CN 101820274 A CN101820274 A CN 101820274A CN 201010151136 CN201010151136 CN 201010151136 CN 201010151136 A CN201010151136 A CN 201010151136A CN 101820274 A CN101820274 A CN 101820274A
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China
Prior art keywords
switch
load
circuit
power supply
power
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Pending
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CN 201010151136
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Chinese (zh)
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李新军
程传银
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Yu Keyi
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WUHAN XINGHUO INVESTMENT CONSULTATION CENTER
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Abstract

The invention discloses a sparkless safety switch and a socket comprising the same, wherein the switch comprises a switch trigger circuit and a switch transistor which are electrically connected, the switch transistor is connected in series on a power line, the switch trigger circuit is used for outputting a trigger signal to the switch transistor and controlling the switch transistor to be switched off and switched on, and two ends of the power line are respectively used for connecting a power supply and a load. The safety switch circuit of the invention is completely contactless, and the arc discharge phenomenon can not occur: when the plug is inserted into the socket, the socket is not electrified, the voltage of the load capacitor is zero, no sudden change exists, no current exists, and no arc is drawn to generate sparks; before the plug is pulled out, the power supply is automatically cut off at the zero crossing point of the load current, the load inductive current is zero, no sudden change or high induction voltage exists, and the arc discharge cannot be caused to generate sparks.

Description

A kind of no-spark safety switch, socket and safe power on/off method
Technical field
The present invention relates to a kind of safety switch, specifically, be a kind of when carrying out switching manipulation the safety switch of no-spark, no impingement, the invention still further relates to the socket that comprises this safety switch and the method for safe power on/off.
Background technology
Load such as industrial equipment, household electrical appliance all presents certain perception and capacitive, in the connection process of load and power supply, load capacity moment energising when circuit is connected, electric capacity never electricity is short more to the process time that is full of electricity, the inductive kick electric current is strong more, tends to arcing and produces spark; The interrupting process of load and power supply, inductive load instant cut-off when circuit disconnects, inductance is short more to the process time of outage from big electric current, and inductive surge is strong more, also can arcing produce spark.The contact contact-making surface of switch contact or plug and socket does not recline, and loose contact also can produce spark when folding and charged plug.These sparks are dangerous, and especially in inflammable and explosive place, the spark that need avoid Switching Power Supply to cause causes danger such as blast.
Existing sealed type safety anti-explosive socket and safety anti-explosive switchgear are to prevent to explode with contacting of contact electric arc by sealing isolated combustible, and this mode still exists electric arc and spark in the seal internal electrical contact, has potential hazard.For example damage is arranged, when slot leakage is arranged, also can cause danger when seal casinghousing.
Major defect and deficiency that prior art exists have:
1, can't stop to produce electric arc when load inserts power supply or withdraws from power supply fully, spark causes burning or explosion accident;
2, switch contact and plugs and sockets are burnt damage by electric arc, reduce the functional reliability and the useful life of device for switching;
3, drop into condensive load equipment and can produce over-current shock;
4, excision inductive load equipment can produce the overvoltage impact;
The Danger Electric shock risk accident takes place when 5, load inserts power supply or withdraws from power supply easily.
Summary of the invention
The technical problem to be solved in the present invention can not produce safety switch, socket and the safe power on/off method of spark when providing a kind of power on/off.
In order to solve the problems of the technologies described above, the invention provides a kind of safety switch, the switch triggering circuit and the switching transistor that comprise electric connection, described switching transistor is serially connected on the power line, described switch triggering circuit is used to export triggering signal and gives described switching transistor, transistorized disconnection of control switch and conducting, described power line two ends are respectively applied for and connect power supply and load.
Further, also comprise a rectification circuit, the input termination power of described rectification circuit, the described switch triggering circuit of output termination is used to described switch triggering circuit that working power is provided.
Further, described rectification circuit is made up of the dividing potential drop capacitance resistance, rectifier diode, voltage-stabiliser tube and the filter capacitor that electrically connect successively.
Further, described switching transistor is by a pair of antiparallel thyristor, and the protection diode of thyristor two ends parallel connection and resistance composition.
Further, described switch triggering circuit is made up of the current-limiting resistance, infrared reflection optocoupler, the zero cross fired bidirectional triode thyristor optocoupler that electrically connect successively, exports triggering signal by described zero cross fired bidirectional triode thyristor optocoupler to described switching transistor.
Further, also be serially connected with buffer circuit on the power line between described switching transistor and the load.
Further, described buffer circuit is made up of ground capacity, resistance, and described electric capacity, resistance parallel connection are connected between power firestreak and the ground wire.
The present invention also provides a kind of socket that comprises above-mentioned safety switch.
The present invention also provides a kind of method that realizes safe power on/off, comprising:
Switching transistor is inserted between power supply and the load with off-state;
Receive energized instruction by a switch triggering circuit, and the output triggering signal is given described switching transistor when the supply voltage zero passage;
Described switching transistor receives conducting after the described triggering signal, and the path between power supply and the load is connected.
Further, behind the path between energized and the load, also comprise:
The switch triggering circuit receives deenergization instruction, stops exporting to the triggering signal of described switching transistor;
Described switching transistor turn-offs behind current over-zero, and the path between power supply and the load is disconnected.
Contactless fully in the safety switch circuit of the present invention, the arcing phenomenon can not occur: not charged during socket when plug inserts, load capacitance voltage is zero, not sudden change, and non-inductive electric current can arcing not produce spark; Automatically cut off the electricity supply at load current point before plug is extracted, the load inductance electric current is zero, not sudden change, and non-inductive high pressure can arcing not produce spark yet.
Description of drawings
Fig. 1 is the embodiment that safety switch of the present invention is applied to single phase circuit;
Fig. 2 is the embodiment that safety switch of the present invention is applied to single phase circuit;
Fig. 3 is the circuit diagram of an embodiment of rectification circuit among the present invention;
Fig. 4 is the circuit diagram of an embodiment of switch triggering circuit among the present invention.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments, can be implemented so that those skilled in the art can better understand the present invention also, but illustrated embodiment is not as a limitation of the invention.
As shown in Figure 1, be applied to the embodiment of single phase circuit for safety switch of the present invention.This safety switch comprises the switch triggering circuit and the switching transistor of electric connection, and switching transistor is serially connected on the power line, and the power line two ends connect power supply and load respectively.Also comprise a rectification circuit, the input termination power of rectification circuit, output termination switch triggering circuit is used to described switch triggering circuit that dc supply is provided.
Wherein, rectification circuit can adopt half-bridge rectification circuit, full bridge rectifier etc., as shown in Figure 3, the rectification circuit in the present embodiment is made up of the dividing potential drop capacitor C 1, divider resistance R1, rectifier diode D1, D2, voltage-stabiliser tube D3 and the filter capacitor C2 that electrically connect successively.Switching transistor is made up of a pair of antiparallel thyristor, and that realizes power supply and load circuit cut-offs with closed thyristor two ends protection in parallel diode and resistance.Inverse parallel refers to two thyristor reverse parallel connections.Thyristor is conducting when triggering signal is arranged, power supply and load circuit closure; When Triggerless, turn-off after the thyristor current flows zero passage, power supply and load circuit disconnect.Thyristor herein can replace with other electronic power switch transistor devices.
As shown in Figure 4, the switch triggering circuit is made up of current-limiting resistance R2, the infrared reflection optocoupler U2 and the zero cross fired bidirectional triode thyristor optocoupler U1 that electrically connect successively in the present embodiment.During work, the switch triggering circuit detects physical switch state (open and close) and is converted to electric parameters by infrared reflection optocoupler U2, by the conducting of zero cross fired bidirectional triode thyristor optocoupler U1 output triggering signal control thyristor.Also available other triggering modes of circuits for triggering.
Also be serially connected with buffer circuit on the power line between switching transistor and the load, buffer circuit is made up of ground capacity and resistance, and described electric capacity, resistance parallel connection are connected between power firestreak and the ground wire.Buffer circuit is eliminated electronic switching device and is closed the have no progeny induced voltage of still existence and the influence of leakage current, guarantees that thyristor disconnects back loading and power supply disconnects fully.
In the present embodiment, only be serially connected with switching transistor on live wire, in other embodiments, also can be connected in series switching transistor simultaneously on live wire and zero line, the switching transistor on live wire and the zero line is subjected to the Synchronization Control of switch triggering circuit.
As shown in Figure 2, when safety switch of the present invention is applied to three-phase circuit, all be serially connected with switching transistor on three live wires, each switching transistor is subjected to the Synchronization Control of switch triggering circuit, and rectification circuit can be from power taking on any live wire and the zero line.
The method of the safe power on/off of realization of the present invention may further comprise the steps:
Switching transistor is inserted between power supply and the load with off-state;
Receive energized instruction by a switch triggering circuit, and the output triggering signal is given described switching transistor when the supply voltage zero passage;
Described switching transistor receives conducting after the described triggering signal, and the path between power supply and the load is connected.
Behind the path between energized and the load, also can may further comprise the steps:
The switch triggering circuit receives deenergization instruction, stops exporting to the triggering signal of described switching transistor;
Described switching transistor turn-offs behind current over-zero, and the path between power supply and the load is disconnected.
Safety switch of the present invention is safer, simple, convenient than traditional product when operation.Plug inserts or extracts is complete operation, and operation all is to carry out under off-position, electric shock accidents can not take place.Traditional product is hot line job when inserting or extracting, so keep away unavoidable grafting and the starting the arc, arcing phenomenon when extracting.Part adopts the product of electromagnetic relay, and the contact also can produce spark phenomenon when the adhesive of relay and disconnection.The present invention is not charged fully in the process of plug plug, and contactor partly adopts complete contactless method, so can not produce pyrophoric behavio(u)r.Power consumption equipment all has certain electric capacity and inductance, and traditional product the time causes the electric capacity of load and the voltage or the current break of inductance in plug, and output surge voltage and electric current influence useful life of equipment, the serious device damage that causes.The present invention is an off-position when the plug plug, contactor process electric current and voltage smooth change, and electric current cuts off at zero crossing, and load can not produce the surge voltage electric current.The switch triggering circuit work power is obtained by power supply is carried out the dividing potential drop rectifying and wave-filtering among the present invention, need not external control power supply.The present invention's electrically contacting property in use is quite reliable, can not cause that control system is malfunctioning because of loose contact, communication system is interrupted, image is lost, transmitted to computer error code and file and distorted signals, appliance cut-off etc.Also can effectively prevent simultaneously the contact portion superheating phenomenon that causes because of loose contact.
The above embodiment is the preferred embodiment that proves absolutely that the present invention lifts, and protection scope of the present invention is not limited thereto.Being equal to that those skilled in the art are done on basis of the present invention substitutes or conversion, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.

Claims (10)

1.一种无火花安全开关，其特征在于，包括电性连接的开关触发电路和开关晶体管，所述开关晶体管串接在电源线上，所述开关触发电路用于输出触发信号给所述开关晶体管，控制开关晶体管的断开与导通，所述电源线两端分别用于连接电源和负载。1. A non-spark safety switch, characterized in that it comprises an electrically connected switch trigger circuit and a switch transistor, the switch transistor is connected in series on the power line, and the switch trigger circuit is used to output a trigger signal to the switch The transistor is used to control the disconnection and conduction of the switching transistor, and the two ends of the power line are respectively used to connect the power supply and the load. 2.根据权利要求1所述的安全开关，其特征在于，还包括一整流电路，所述整流电路的输入端接电源，输出端接所述开关触发电路，用于为所述开关触发电路提供工作电源。2. The safety switch according to claim 1, further comprising a rectifier circuit, the input terminal of the rectifier circuit is connected to a power supply, and the output terminal is connected to the switch trigger circuit, for providing the switch trigger circuit with Working power. 3.根据权利要求2所述的安全开关，其特征在于，所述整流电路由依次电性连接的分压电容电阻、整流二极管、稳压管和滤波电容组成。3 . The safety switch according to claim 2 , wherein the rectifier circuit is composed of a voltage dividing capacitor resistor, a rectifier diode, a voltage regulator tube and a filter capacitor electrically connected in sequence. 4 . 4.根据权利要求1所述的安全开关，其特征在于，所述开关晶体管由一对反并联的晶闸管，及晶闸管两端并联的保护二极管和电阻组成。4 . The safety switch according to claim 1 , wherein the switching transistor is composed of a pair of anti-parallel thyristors, and protective diodes and resistors connected in parallel at both ends of the thyristors. 5.根据权利要求1所述的安全开关，其特征在于，所述开关触发电路由依次电性连接的限流电阻、红外反射式光耦、过零触发双向可控硅光耦组成，由所述过零触发双向可控硅光耦向所述开关晶体管输出触发信号。5. The safety switch according to claim 1, wherein the switch trigger circuit is composed of a current-limiting resistor, an infrared reflective optocoupler, and a zero-crossing trigger triac optocoupler, which are electrically connected in sequence. The zero-cross trigger triac optocoupler outputs a trigger signal to the switch transistor. 6.根据权利要求1所述的安全开关，其特征在于，所述开关晶体管与负载之间的电源线上还串接有隔离电路。6. The safety switch according to claim 1, characterized in that an isolation circuit is connected in series on the power line between the switching transistor and the load. 7.根据权利要求6所述的安全开关，其特征在于，所述隔离电路由接地电容、电阻组成，所述电容、电阻并联，接于电源火线与地线之间。7. The safety switch according to claim 6, wherein the isolation circuit is composed of a grounding capacitor and a resistor, and the capacitor and the resistor are connected in parallel and connected between the live wire of the power supply and the ground wire. 8.一种包含权利要求1～7中任意一项所述安全开关的插座。8. A socket comprising the safety switch according to any one of claims 1-7. 9.一种实现安全通断电的方法，其特征在于，包括：9. A method for realizing safe power on and off, comprising: 将开关晶体管以断开状态接入电源与负载之间；Connect the switching transistor between the power supply and the load in a disconnected state; 由一开关触发电路接收一接通电源指令，并在电源电压过零时输出触发信号给所述开关晶体管；A switch trigger circuit receives a power-on instruction, and outputs a trigger signal to the switch transistor when the power supply voltage crosses zero; 所述开关晶体管接收到所述触发信号后导通，使电源与负载之间的通路接通。The switching transistor is turned on after receiving the trigger signal, so that the path between the power supply and the load is turned on. 10.根据权利要求1所述的实现安全通断电的方法，其特征在于，在接通电源与负载之间的通路后，还包括：10. The method for realizing safe power on and off according to claim 1, further comprising: 开关触发电路接收一断开电源指令，终止输出给所述开关晶体管的触发信号；The switch trigger circuit receives a power-off instruction, and terminates the trigger signal output to the switch transistor; 所述开关晶体管在电流过零后关断，使电源与负载之间的通路断开。The switching transistor is turned off after the current crosses zero, so that the path between the power supply and the load is disconnected.
CN 201010151136 2010-04-20 2010-04-20 Sparkless safety switch, socket and safety power on-off method Pending CN101820274A (en)

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CN 201010151136 CN101820274A (en) 2010-04-20 2010-04-20 Sparkless safety switch, socket and safety power on-off method

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CN 201010151136 CN101820274A (en) 2010-04-20 2010-04-20 Sparkless safety switch, socket and safety power on-off method

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014089979A1 (en) * 2012-12-11 2014-06-19 华为技术有限公司 Power distribution system and power distribution unit
CN104966633A (en) * 2015-05-20 2015-10-07 王运国 Switch assembly
CN105575061A (en) * 2016-02-25 2016-05-11 百色学院 Intelligent coal gas leakage safe circuit breakage system
CN109036961A (en) * 2018-08-08 2018-12-18 广州隽智智能科技有限公司 A kind of intelligent switch
CN110297453A (en) * 2019-07-17 2019-10-01 湖南联智桥隧技术有限公司 Intelligent-induction controls socket and intelligent control method
CN110780619A (en) * 2019-10-14 2020-02-11 珠海格力电器股份有限公司 Circuit control method, device and equipment

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US5424671A (en) * 1990-09-26 1995-06-13 Robert Bosch Gmbh Power output stage having a darlington-pair circuit for switching an inductive load, especially the ignition coil of an internal-combustion engine
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CN2419724Y (en) * 2000-02-25 2001-02-14 刘倬云 Distribution style contactless switch assembly
CN2495064Y (en) * 2000-04-14 2002-06-12 陈兴忠 Electric semiconductor AC switch module
CN201726376U (en) * 2010-04-20 2011-01-26 武汉星火投资咨询中心 Spark-free safety switch and socket

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2046291U (en) * 1988-04-27 1989-10-18 陈广来 Mixing type d.c. pulse-amplitude modulator
US5424671A (en) * 1990-09-26 1995-06-13 Robert Bosch Gmbh Power output stage having a darlington-pair circuit for switching an inductive load, especially the ignition coil of an internal-combustion engine
CN2259721Y (en) * 1996-05-02 1997-08-13 陈锋 Compatible SCR remote-controlling switch
CN2419724Y (en) * 2000-02-25 2001-02-14 刘倬云 Distribution style contactless switch assembly
CN2495064Y (en) * 2000-04-14 2002-06-12 陈兴忠 Electric semiconductor AC switch module
CN201726376U (en) * 2010-04-20 2011-01-26 武汉星火投资咨询中心 Spark-free safety switch and socket

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Title
《电气开关》 19971231 李福存等 无触点无火花开关及其应用 第42-43页、图1-3 6-7 , 第4期 2 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014089979A1 (en) * 2012-12-11 2014-06-19 华为技术有限公司 Power distribution system and power distribution unit
CN104966633A (en) * 2015-05-20 2015-10-07 王运国 Switch assembly
CN105575061A (en) * 2016-02-25 2016-05-11 百色学院 Intelligent coal gas leakage safe circuit breakage system
CN109036961A (en) * 2018-08-08 2018-12-18 广州隽智智能科技有限公司 A kind of intelligent switch
CN110297453A (en) * 2019-07-17 2019-10-01 湖南联智桥隧技术有限公司 Intelligent-induction controls socket and intelligent control method
CN110780619A (en) * 2019-10-14 2020-02-11 珠海格力电器股份有限公司 Circuit control method, device and equipment

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