CN202384740U

CN202384740U - Overvoltage-undervoltage protection switch with automatic switch-on function

Info

Publication number: CN202384740U
Application number: CN201120565695XU
Authority: CN
Inventors: 朱荣惠
Original assignee: WUXI HAUYANG TECHNOLOGY CO LTD
Current assignee: WUXI HAUYANG TECHNOLOGY CO LTD
Priority date: 2011-12-30
Filing date: 2011-12-30
Publication date: 2012-08-15
Anticipated expiration: 2021-12-30

Abstract

The utility model is suitable for the technical field of the switching power supply products, provides an overvoltage-undervoltage protection switch with an automatic switch-on function. Overvoltage or undervoltage signals are detected by an overvoltage-undervoltage detection unit, and then, the detected overvoltage or undervoltage signals are input into a control unit by the overvoltage-undervoltage detection unit. A trip control signal is output to a trip execution unit by a control unit to execute the trip of the switch. When voltage turns to normal, the detection of the detection unit is recovered by the voltage, normal voltage signals are input to the control unit, and the control unit judges whether the recovered voltage can meet the requirements of set time parameters or not. If the recovered voltage can meet the requirements of set time parameters, a reset control signal is output to the execution unit so as to eliminate the situation of switching on the switch by mistakes due to the voltage fluctuation of a network. The product disclosed by the invention is a device integrating a time delay function and an overvoltage-undervoltage protection function, and has the advantages of automatic switch-on, abundant functions, low cost and favorable economic benefit.

Description

A kind of overvoltage/undervoltage protection switch with automatic switching-in function

Technical field

The utility model belongs to power protection switching technique field, relates in particular to a kind of overvoltage/undervoltage protection switch with automatic switching-in function.

Background technology

Along with making rapid progress of science and technology and improving constantly of people's quality of life; Electronics, electric equipment products have got into huge numbers of families; Also progressively strengthening for the protection person and the awareness of safety of equipment, the function of the electronic product that particularly uses now is more and more important, and the field that electronic product is used is also more and more important; Protection to equipment is also more and more important, and the requirement to protector of all kinds accordingly also improves constantly.

Circuit brake is widely used at present, through setting and circuit brake wherein, can effectively avoid the influence to circuit of high pressure or low pressure; Normally used in the market protector has only overvoltage and the under voltage in the difference testing circuit; But after voltage has normally, also need artificial going that switch is closed a floodgate, and the position that some this switch is put is the very difficult place that arrives of people; Wait so just for the client in use and brought a lot of inconveniences; And sometimes this electrical network overvoltage or under-voltage be since the interference of moment or around have large-size machine to cause using, and the overvoltage of this moment and under-voltage time are very short, so just need people's combined floodgate switch back and forth; Bring a lot of inconveniences to the user; Now society is more strict to the safety requirements of the person, and the general user is that suggestion operations is not this has the switchgear of injury to human body, like this will be to the very big cost of associated maintenance increase.

So prior art exists not enough, need to improve and improve.

The utility model content

The purpose of the utility model is to provide a kind of overvoltage/undervoltage protection switch with automatic switching-in function, efficiently solve existing circuit protection device function singleness in the prior art, can not automatic closing defective.

The utility model is achieved in that a kind of overvoltage/undervoltage protection switch with automatic switching-in function, it is characterized in that, comprises power subsystem; The overvoltage/undervoltage detecting unit, control unit, voltage recover normal detecting unit; The trip performance element and the performance element that resets, wherein

Said power subsystem respectively with said overvoltage/undervoltage detecting unit; Said control unit; Said voltage recovers normal detecting unit and is connected with the performance element signal that resets; Be used to said overvoltage/undervoltage detecting unit and said voltage and recover the amplifier power supply that normal detecting unit provides 5 volts of reference voltages and 12 volts, and be said control unit and the said performance element power supply that resets;

Said control unit respectively with said overvoltage/undervoltage detecting unit; Said voltage recovers normal detecting unit; Said trip performance element is connected with the said performance element signal that resets; Said control unit is used for the overvoltage or the under-voltage signal that are detected according to said overvoltage/undervoltage detecting unit, and the output tripping operation controls signal to said trip performance element, carries out the tripping operation of said switch;

Said voltage recovers the voltage that normal detecting unit is used to detect behind said switch trip and recovers just often; The normal voltage signal is inputed to said control unit; To the said performance element that resets, carry out the combined floodgate of said switch through said control unit output reseting controling signal.

Wherein, said overvoltage/undervoltage detecting unit comprises operational amplifier U7, operational amplifier U8; Diode D3-1 diode D3-2 and some resistance are formed; The negative terminal of operational amplifier U7 connects said reference voltage, and the anode of operational amplifier U7 connects said power subsystem through said some resistance and is used for sampling, and the signal output part of operational amplifier U7 meets diode D3-1; When the positive terminal voltage of said operational amplifier U7 during greater than its negative terminal reference voltage; Said diode D3-1 conducting, said operational amplifier U7 is used to detect overvoltage condition, and exports a high potential to said control unit; The said reference voltage of positive termination of operational amplifier U8; The negative terminal of operational amplifier U8 connects said power subsystem through said some resistance and is used for sampling; The signal output part of operational amplifier U8 meets diode D3-2, when the positive terminal voltage of said operational amplifier U8 during greater than its negative terminal reference voltage, and said diode D3-2 conducting; Said operational amplifier U8 is used to detect under-voltage condition, and exports a high potential to said control unit.

Wherein, Said overvoltage/undervoltage detecting unit is through after resistance R 30 and resistance R 20 series connection inputing to said overvoltage or the high potential signal when under-voltage the 7th pin of the control chip U2 of said control unit; The 14th pin of control chip U2 is sent to optical coupler U6 through resistance R 12 with high potential signal simultaneously, and said optical coupler U6 conducting makes its A; B holds closed; The controllable silicon Q4 control utmost point in the said trip performance element obtains a trigger voltage conducting, and the tripping operation of said switch is carried out in the electromagnet DCT energising work of said trip performance element.

Wherein, said voltage recovers normal detecting unit and comprises operational amplifier U9 and operational amplifier U10, returns to normal voltage when said operational amplifier U9 exclusive disjunction amplifier U10 detects voltage; Electronegative potential of said operational amplifier U9 exclusive disjunction amplifier U10 output is to the 3rd pin of the control chip U2 of said control unit, when voltage returned to normal voltage after 3 minutes, through high level of the 8th pin output of said control chip U2; Said high level signal is sent to the said performance element that resets; The said performance element that resets comprises controllable silicon Q1, controllable silicon Q2, resistance R 18 and PTC combined floodgate actuator; The 8th pin of the said control chip U2 of one termination of said resistance R 18; The control utmost point of the said controllable silicon Q2 of another termination, when said high level signal through said resistance R 18, make said controllable silicon Q2 conducting; Said PTC switches on, and carries out the combined floodgate of said switch.

The beneficial effect of the utility model is: a kind of overvoltage/undervoltage protection switch that the utility model provided with automatic switching-in function, and the utility model has adopted overvoltage and less voltage protector, also has in the simultaneity factor after voltage recovers normally; The function that can automatically switch be closed a floodgate, when the voltage that gets into the user in the electrical network was too high or too low, this switch just can be good at it is made judgement; When detection system has detected overvoltage or under-voltage condition, will send instruction and carry out corresponding action to control unit, switch is broken off; If after this supply voltage recover again normal after, the detection in this switch to voltage normal after, will send instruction and give control unit; This switch is closed a floodgate, and very big advantage of this switch is, when environment for use very harsh; For example there is main equipment to work around, high pressure, the sometimes situation of low pressure when the voltage of this moment will have along with the use of equipment; Sometimes normal again, in order to eliminate the instability of line voltage work, this switch designs is considered this situation; Only in line voltage kept 3 minutes, do not occur overvoltage or under-voltage in, switch judges that just this voltage is normal voltage, just close a floodgate this moment; That is to say, just can close a switch after having only voltage the time in the normal range (NR) of recovering to have 3 minutes, can eliminate the situation of the switch false switching that voltage ripple of power network brings like this; The utility model product is a kind of delay function, overvoltage, under-voltage protection device of being integrated with; Automatic closing has feature richness, cost is low, good economic benefit.

Description of drawings

Fig. 1 is the utility model one embodiment schematic block circuit diagram.

Fig. 2 is the utility model one embodiment circuit theory diagrams.

Embodiment

For solve existing circuit protection device function singleness in the present technology, can not automatic closing defect problem; The utility model provides the protection switch of the overvoltage/undervoltage with automatic switching-in function, and the core concept of this utility model is: through after the tripping operation of switch overvoltage/undervoltage, when line voltage returns to normal voltage; This switch closes a floodgate this switch automatically; Reduced the follow-up maintenance expense of product greatly, and this automatic closing device also protected personal safety to a great extent, this product function is abundant; Cost is low, has good economic benefit.

For the purpose, technical scheme and the advantage that make the utility model is clearer, clear and definite, below develop simultaneously embodiment to the utility model further explain with reference to accompanying drawing.

Accompanying drawing 1 is the schematic block circuit diagram of the utility model; Comprise power subsystem 100, overvoltage/undervoltage detecting unit 200, control unit 300; Voltage recovers normal detecting unit 400; The trip performance element 500 and the performance element 600 that resets, wherein, power subsystem 100 recovers normal detecting unit 400 with overvoltage/undervoltage detecting unit 200, control unit 300, voltage respectively and links to each other with the performance element 600 that resets; The power supply that is used to 5 volts of reference voltages and 12V are provided is to two detecting

units

200 and 400, and 5 volts voltages is provided and supplies power to the performance element 600 that resets for control unit 300; Overvoltage/undervoltage detecting unit 200 is used to detect overvoltage and under-voltage condition signal, and fault-signal is sent in the control unit 300, carries out the tripping operation of the utility model K switch for trip performance element 500 through control unit 300 outputs one tripping operation control signal.After voltage recovers normal detecting unit 300 and detects switch trip voltage and recover normal dimensions and be held in a stipulated time, to the performance element 600 that resets, carry out the combined floodgate of said K switch through control unit 300 outputs one reseting controling signal.

Accompanying drawing 2 is the embodiment schematic diagram of the utility model, and wherein power subsystem 100 mainly comprises U1, and U1 is a rectifier bridge, and the 1 and 3 termination civil power alternating currents of U1 also comprise the resistance R 1 that is connected in series; R2, R3, R4 and R5, the cathode voltage V+ of a termination U1 of this resistance R that is cascaded 1, the negative pole V-ground connection of U1; One termination operational amplifier U7 of resistance R 5 and the power end of operational amplifier U8, the cathode voltage of a termination U1 of resistance R 32 is through the resistance R 32 that is connected in series, R33; R34, R35 and R36 are the reference voltage that operational amplifier U7 and operational amplifier U8 provide 5V, and the power end that recovers operational amplifier U9 and the operational amplifier U10 of normal detecting unit 400 for voltage provides the reference voltage of 12V power supply and 5V, and its principle is: convert alternating voltage to direct voltage through the U1 rectifier bridge; Pass through dropping resistor R1, R2, R3, R4 then; R5 and R32, R33, R34, R35; R36 carries out step-down, through voltage-stabiliser tube D1, and D2 voltage stabilizing, C1; C2 filtering obtains stable DC voltage, 12V supply voltage and 5V reference voltage is provided for respectively four operational amplifiers, also for the register in the control unit 300 5V is provided voltage.

Overvoltage/undervoltage detecting unit 200 mainly comprises two operational amplifier U7, U8, and resistance R 6, R7, R8, R9,

R10 and R11, two diode D3-1 and D3-2, wherein the negative terminal of operational amplifier U7 connects 5 volts reference voltage; The anode of operational amplifier U7 carries out dividing potential drop through resistance R 10 with R11, an end of resistance R 10 resistance R 6 that is connected in series, R7; R8; R9 is used for sampling to the U1 positive pole in the power subsystem, and the signal output part of operational amplifier U7 meets diode D3-1, when the positive terminal voltage of the operational amplifier U7 that is used to detect the overvoltage signal during greater than its negative terminal reference voltage; Diode D3-1 conducting, operational amplifier U7 exports high potential a to control unit 300; And being used to detect the positive termination 5V reference voltage of the operational amplifier U8 of under-voltage signal, the negative terminal of operational amplifier U8 is through resistance R 6, R7; R8; R9 is used for sampling to the U1 positive pole in the power subsystem, and the signal output part of operational amplifier U8 meets diode D3-2, when the positive terminal voltage of operational amplifier U8 during greater than its negative terminal reference voltage; Diode D3-2 conducting; Operational amplifier U8 also exports high potential a to control unit 300, no matter control unit 300 is overvoltages and when under-voltage, the signal input of a high potential all can be arranged here.

Control unit 300 mainly comprises master control chip U2, register U3, and the pin among the master control chip U2 mainly comprises pin 3,5; 7,8,9; The pin that tripping operation and recovery were just often closed a floodgate and used when 10 and 14 pins, these pins were the utility model control overvoltage/undervoltage, other pin is not done detailed description; Wherein when overvoltage/undervoltage detecting unit 200 detect overvoltage and under-voltage after a high potential signal is inputed to the 7th pin of master control chip U2 through resistance R 30 (this resistance is 56K Europe) and resistance R 20; One end ground connection of capacitor C 7, other end connecting resistance R20, capacitor C 7 is a parallel connection voltage-stabiliser tube D7 (D7 is 5.6V) also; Voltage-stabiliser tube D7 is used for voltage stabilizing; C7 is used for filtering, and resistance R 20 is used to prevent overtension, shields; When pin 5 pin of U2 and 7 pin all were high level, the 14th pin of master control chip U2 can be exported a high potential and through resistance R 12 high-potential voltage inputed to optical coupler U6, optical coupler U6 conducting (voltage is greater than 0.1V); Make its A, B end (A, the B end is equivalent to a switch) closure; Master control chip U2 the 10th and 9 pins respectively with 5 of register; 6 bipods connect, and play the communication effect, and the closure each time or the off-state of K switch all store through register U3.

Voltage recovers normal detecting unit 400 and comprises two operational amplifier U9, U10, two diode D9-1 and D9-2; Operational amplifier U9 is used to detect the overvoltage condition signal, and operational amplifier U10 is used to detect the under-voltage condition signal, after under-voltage or overvoltage make the K switch tripping operation; Operational amplifier U9 exclusive disjunction amplifier U10 detects voltage and returns to normal voltage, the 3rd pin of the control chip U2 of electronegative potential a to control unit 300 of operational amplifier U9 exclusive disjunction amplifier U10 output, and because C; The D end switch is an off-state, so the 5th pin of control chip U2 also is a low level, when the 3rd and 5 pins that satisfy control chip U2 simultaneously all are low level; And judge whether that through control chip U2 the normal voltage of being recovered satisfies predefined delay time and requires (the utility model is set to voltage and recovers to close a floodgate after normal 3 minutes), this moment control chip U2 high level of the 8th pin output, high level signal is sent to the performance element 600 that resets; The performance element that resets comprises controllable silicon Q1, controllable silicon Q2, resistance R 18 and PTC (combined floodgate actuator); The 8th pin of one termination control chip U2 of resistance R 18; The control utmost point of the said controllable silicon Q2 of another termination when high level signal passes through resistance R 18, makes controllable silicon Q2 conducting; The PTC energising, the feed motion of execution K switch.

Trip performance element 500 comprises rectifier bridge U4, and rectifier bridge U4 converts alternating voltage to direct current, is used to the controllable silicon Q3 in the trip performance element, and Q4 and optical coupler U5 provide power supply; When above-mentioned optical coupler U6 conducting, A after the B end closure, makes the controllable silicon Q4 control utmost point obtain a trigger voltage conducting; The electromagnet DCT energising work of trip performance element, the K switch tripping operation in the executive system, under the utility model normal operating conditions, optical coupler U5 is in electriferous state; C, D is normal, is closure state, and the 5th pin of control chip U2 is a high potential like this; But when overvoltage or when under-voltage, A, after the B end closure, switch trip; Rectifier bridge U4 does not have electricity, and the input of optical coupler U5 does not have voltage input, C yet like this; D (being equivalent to a switch) holds disconnection, and the 5th pin of control chip U2 is an electronegative potential, and C and D two ends are that to be used for sense switch K be at normal condition or off state.

The operation principle of the utility model is described below: when voltage normal range (NR) (the utility model normal voltage scope is set between the 161V-279V), when K switch was closed, two operational amplifier U7 in the overvoltage/undervoltage detecting unit 200 did not have voltage to export with U8; Control chip U2 the 7th pin low level in the control unit 300 like this; The 14th pin no-output of control chip U2, optical coupler U6 can not open, just not conducting of controllable silicon Q4; Electromagnet DCT does not work, and K switch does not trip; When overvoltage 280V-294V appears in supply voltage, when K switch was closed, the voltage of obtaining on the resistance R 11 was greater than the reference voltage of 5V, the operational amplifier U7 of overvoltage/undervoltage detecting unit 200 output; This moment, operational amplifier U8 did not work, and through diode D3-1, resistance R 30 (56K) is passed through the voltage stabilizing of (5.6V) voltage-stabiliser tube D7 again; Capacitor C 7 filtering, resistance R 20 (prevent overtension, shield) gives control chip U2 the 7th pin a high level input; 5 pin of control chip U2 are that (control chip U2 the 5th pin is a high level to low level for C, the switch closure of D end; C, the switch of D end breaks off, control chip U2 the 5th pin is a low level); When the 5th pin of control chip U2 and the 7th pin all were high level, the 14th pin of control chip U2 will be exported a high level (this high level signal is the tripping operation control signal), through resistance R 12 (step-down and protective effect); Optical coupler U6 opens (voltage is greater than 0.1V), capacitor C 10 (filtering), resistance R 27 (preventing that controllable silicon from misleading); Controllable silicon Q4 obtains a trigger voltage conducting, and the disconnection of K switch is carried out in the electromagnet DCT work of switching on.When under-voltage 144V-160V occurring, resistance R 10 voltage of overvoltage/undervoltage detecting unit 200 are during less than reference voltage 5V, and operational amplifier U8 has output; This moment, operational amplifier U7 did not work, and the overvoltage principle that above is described is the same, the 7th pin input high level of control chip U2; This moment, the 14th pin of control chip U2 was exported high level, and optical coupler U6 opens (voltage is greater than 0.1V), controllable silicon Q4 conducting; Electromagnet DCT work, through tripping mechanism, the K switch tripping operation.

As shown in Figure 2, it is to recover behind the switch overvoltage/undervoltage trip protection to realize closing function after the normal voltage that voltage recovers normal detecting unit 400, the same with the overvoltage/undervoltage principle of overvoltage/undervoltage detecting unit 200; Through two sampling voltage resistance R 10-1 and R11-1, follow the reference voltage of 5V to compare, when K switch overvoltage/undervoltage tripping operation back voltage returns between the normal voltage 180V-267V from overvoltage/undervoltage; The operational amplifier (U9 or U10) that voltage recovers in the normal detecting unit 400 is exported the 3rd pin that a low level is given control chip U2, because the tripping operation of K switch overvoltage/undervoltage, this moment, the 5th pin of control chip U2 also was that low level (is worked as C; When the D two ends were in closure state, the 5th pin of control chip U2 was a high level, works as C; The D two ends be in off-state the time, the 5th pin of control chip U2 is a low level), control chip U2 judges that K switch is an off-state; When control chip U2 the 3rd pin and the 5th pin when all being low level; Through the chip internal programming, the 8th a pin high level of output (this signal is a reseting controling signal) that makes control chip U2 makes controllable silicon Q2 conducting through resistance R 18; The work of PTC energising this moment actuator is closed the K lock with switch.Just close a floodgate after voltage is stable for guaranteeing K switch; The utility model is provided with a detection in 3 minutes in advance; Promptly after K switch overvoltage/undervoltage tripping operation, when voltage returned to normal voltage, control chip U2 detected voltage and recovers just to carry out the feed motion operation after stable within 3 minutes.How to realize that specifically the concrete technology of closing a floodgate after 3 minutes is this area customary means, so do not do detailed description here.

The above is merely the preferred embodiment of the utility model, not in order to restriction the utility model, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within the protection range of the utility model.

Claims

1. the overvoltage/undervoltage protection switch with automatic switching-in function is characterized in that, comprises power subsystem, the overvoltage/undervoltage detecting unit, and control unit, voltage recover normal detecting unit, the trip performance element and the performance element that resets, wherein,

Said power subsystem respectively with said overvoltage/undervoltage detecting unit; Said control unit; Said voltage recovers normal detecting unit and is connected with the performance element signal that resets; Said power subsystem is used to said overvoltage/undervoltage detecting unit and said voltage and recovers the amplifier power supply that normal detecting unit provides 5 volts of reference voltages and 12 volts, and is said control unit and the said performance element power supply that resets;

2. the overvoltage/undervoltage protection switch with automatic switching-in function according to claim 1; It is characterized in that said overvoltage/undervoltage detecting unit comprises operational amplifier U7, operational amplifier U8; Diode D3-1 diode D3-2 and some resistance are formed; The negative terminal of operational amplifier U7 connects said reference voltage, and the anode of operational amplifier U7 connects said power subsystem through said some resistance and is used for sampling, and the signal output part of operational amplifier U7 meets diode D3-1; When the positive terminal voltage of said operational amplifier U7 during greater than its negative terminal reference voltage; Said diode D3-1 conducting, said operational amplifier U7 is used to detect overvoltage condition, and exports a high potential to said control unit; The said reference voltage of positive termination of operational amplifier U8; The negative terminal of operational amplifier U8 connects said power subsystem through said some resistance and is used for sampling; The signal output part of said operational amplifier U8 meets diode D3-2, when the positive terminal voltage of said operational amplifier U8 during greater than its negative terminal reference voltage, and said diode D3-2 conducting; Said operational amplifier U8 is used to detect under-voltage condition, and exports a high potential to said control unit.

3. the overvoltage/undervoltage protection switch with automatic switching-in function according to claim 2; It is characterized in that said overvoltage/undervoltage detecting unit is through after resistance R 30 and resistance R 20 series connection inputing to said overvoltage or the high potential signal when under-voltage the 7th pin of the control chip U2 of said control unit, the 14th pin of control chip U2 is sent to optical coupler U6 through resistance R 12 with high potential signal simultaneously; Said optical coupler U6 conducting; Make its A, B holds closed, and the controllable silicon Q4 control utmost point in the said trip performance element obtains a trigger voltage conducting; The tripping operation of said switch is carried out in the electromagnet DCT energising work of said trip performance element.

4. according to the described overvoltage/undervoltage protection switch of claim 1, it is characterized in that said voltage recovers normal detecting unit and comprises operational amplifier U9 and operational amplifier U10 with automatic switching-in function; Return to normal voltage when said operational amplifier U9 exclusive disjunction amplifier U10 detects voltage, electronegative potential of said operational amplifier U9 exclusive disjunction amplifier U10 output is to the 3rd pin of the control chip U2 of said control unit, when voltage returned to normal voltage after 3 minutes; High level of the 8th pin output through said control chip U2 is sent to the said performance element that resets with said high level signal, and the said performance element that resets comprises controllable silicon Q1; Controllable silicon Q2; Resistance R 18 and PTC combined floodgate actuator, the 8th pin of the said control chip U2 of a termination of said resistance R 18, the control utmost point of the said controllable silicon Q2 of another termination; When said high level signal through said resistance R 18; Make said controllable silicon Q2 conducting, said PTC switches on, and carries out the combined floodgate of said switch.