CN202997503U - Self-restoring type overvoltage and undervoltage protector achieving zero crossing point switching-on and switching-off - Google Patents
Self-restoring type overvoltage and undervoltage protector achieving zero crossing point switching-on and switching-off Download PDFInfo
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- CN202997503U CN202997503U CN 201220727226 CN201220727226U CN202997503U CN 202997503 U CN202997503 U CN 202997503U CN 201220727226 CN201220727226 CN 201220727226 CN 201220727226 U CN201220727226 U CN 201220727226U CN 202997503 U CN202997503 U CN 202997503U
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- switching
- acquisition circuit
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Abstract
The utility model relates to a self-restoring type overvoltage and undervoltage protector achieving zero crossing point switching-on and switching-off. The protector comprises a central processor, a control module, a power supply module, a relay module, a voltage acquisition circuit and a current acquisition circuit. The relay module comprises a magnetic latching relay the contact of which is serially connected on a 220VAC power supply phase line. The current signal acquisition circuit comprises a current transformer which is composed of a coil and an opening type magnet ring. When an AC (alternating current) voltage is normal, the central processor sends an actuation signal to the relay module at a t3 moment after acquiring a first zero crossing pint of the AC voltage. After a relay actuation response time, a switching-on operation is performed right on the AC voltage zero crossing point. When the voltage is abnormal, the central processor sends a breaking signal to the relay module at a t4 moment after acquiring a first alternating current zero crossing point. After a relay breaking response time, a switching-off operation is performed right on the alternating current zero crossing point. No arc breaking prevents the contact materials from being ablated. Contact resistance between contacts is low. The protector which has the characteristics of reduced energy consumption, high electric life and high mechanical life further prevents inter-phase short circuit problems caused by electric arcs.
Description
Technical field
The utility model relates to the appliance switch technology, particularly a kind of self-reset over/under-voltage protector of realizing that zero crossing closes, divides.
Background technology
As everyone knows, every have the power switch of contact to have electric arc in various degree to produce in the process of disjunction.For a long time, the electric arc problem of power switch is a large research topic of paying much attention to of domestic and international power switch industry, and from the angle of electric arc, " without the electric arc disjunction " is the tidemark that domestic and international power switch industry is pursued.
The harm of electric arc is mainly manifested in following several respects: the time that 1, has extended the device for switching disengagement failure, because the temperature of electric arc is very high, its surface temperature can reach the 3000-4000 degree, central temperature can reach 10000 degree, if electric arc burned for long time, not only with metal molten or the evaporation of contact surface, and near causing electric arc, insulating material burns out, and causes that easily following accident: a. increases severely the internal temperature of switch and pressure and sets off an explosion; B. form arcing, cause the power supply short circuit accident.2, reduced electric life and the mechanical endurance of switch, 3, especially in the fuel gas environment, the electric arc generation can cause fire, causes very big loss to people's lives and properties.
Present traditional self-reset over/under-voltage protector that the contact is arranged, its actuator of closing minute is most is relay, and does not adopt any arc extinguishing means.And therefore present domestic mistake, under-voltage protector product and the bibliographical information that can reach without the electric arc requirement that there is no need a kind of contact-carrying protector of employing new technology of development, fundamentally solves the problem of electric arc.
Summary of the invention
Deficiency in view of the prior art existence; the purpose of this utility model is; a solution is provided; adopt " zero passage disjunction " technology, utilize rule and the characteristics of ac period, make protector in the disjunction of the moment of zero crossing; effectively address this problem; make protector in the process that dynamic and static contact separates, fundamentally suppress the generation of electric arc, thereby realize " closing minute without electric arc ".
For achieving the above object, the utility model is to adopt such scheme to realize: can realize the self-reset over/under-voltage protector that zero crossing closes, divides, it is characterized in that, comprise central processing unit, control module, power module, relay module, voltage signal acquisition circuit and current signal Acquisition Circuit; Central processing unit adopts the PIC16F676 single-chip microcomputer, control module comprises circuits for triggering, circuits for triggering are connected to form by photoelectrical coupler, resistance and diode, relay module comprises relay drive circuit and magnetic latching relay, the contact of magnetic latching relay is serially connected on 220V AC power supplies phase line, the voltage signal acquisition circuit is connected to form by four high guaily unit LM324, photoelectrical coupler, voltage stabilizing didoe and resistance, and the current signal Acquisition Circuit is connected to form by current transformer, voltage stabilizing didoe and Resistor-Capacitor Unit; Wherein, the current transformer that is used for the collection current signal is made of coil and open type magnet ring, and the opening direction of open type magnet ring and radius angle are 50 degree, and opened gap is 2.1mm.
According to said method, can realize zero crossing close, minute self-reset over/under-voltage protector " close-divide " and reach 300,000 times.
The beneficial effects of the utility model: the utility model is a kind of effective ways of avoiding contactor, timesharing to produce electric arc; namely utilize the ac period characteristics; alternating voltage zero-crossing point is connected constantly; the disjunction constantly of alternating current zero crossing is to realize that self-reset over/under-voltage protector closes, timesharing does not have electric arc to produce.Owing to making contact material not ablated without the electric arc disjunction, so contact Contact resistance is little, Energy Intensity Reduction.And reduced the consumption of Precious Metals Resources, made the electric life of protector improve decades of times, also obtained larger raising mechanical endurance, the phase fault problem of having avoided simultaneously electric arc to cause.
Description of drawings
Fig. 1, can realize zero crossing close, minute the self-reset over/under-voltage protector circuit block diagram;
Fig. 2, voltage signal sequential coordinate diagram;
Fig. 3, current signal sequential coordinate diagram;
Fig. 4, zero closes the zero program flow diagram;
Fig. 5, Open magnetic ring schematic diagram;
Fig. 6, voltage collection circuit figure;
Fig. 7, current collection circuit figure;
Fig. 8, circuits for triggering figure;
Fig. 9, Open magnetic ring stereogram.
In figure: 1. Open magnetic ring, 2. magnet ring opening.
Embodiment
Describe the utility model in detail below in conjunction with accompanying drawing:
As extremely shown in Figure 9 in Fig. 1; can realize the self-reset over/under-voltage protector that zero crossing closes, divides; comprise central processing unit, control module, power module, relay module, voltage signal acquisition circuit and current signal Acquisition Circuit, central processing unit adopts the PIC16F676 single-chip microcomputer.
Control module comprises circuits for triggering, and circuits for triggering are connected to form by photoelectrical coupler, resistance and diode.
Relay module comprises relay drive circuit and magnetic latching relay.
Voltage collection circuit is connected to form by four high guaily unit LM324, photoelectrical coupler, voltage stabilizing didoe and resistance.
Current collection circuit is connected to form by current transformer, voltage stabilizing didoe and Resistor-Capacitor Unit; Wherein, the current transformer that is used for the collection current signal is made of coil and open type magnet ring, and the opening direction of open type magnet ring and radius angle are 50 degree, and opened gap is 2.1mm.
Employing improves faradic precision take the open type magnet ring as magnetic core array coiling current transformer can improve magnetic flux greatly.
The input of voltage signal acquisition circuit connects the 220V AC power supplies, and the alternating voltage of collection is received the input of photoelectrical coupler through resistance, and through photoelectric coupling, the output of photoelectrical coupler sends the coupled voltages signal to central processing unit.
As shown in Figure 2 in voltage signal sequential coordinate diagram, when alternating voltage is normal, central processing unit is identified rapidly judgement, and when collecting first zero crossing of alternating voltage, constantly send the adhesive signal in t3 and be input to relay module, after the relay adhesive response time, adhesive when alternating voltage zero-crossing point just; T1 is that central processing unit receives first zero point that collects after the voltage normal signal; T1～t2 is a cycle; T is combined into the relay adhesive response time, and t closes=12ms; T3 is the time of carrying out the last period moment of threading off from first zero crossing to relay, and t3=(20-t closes) ms=8ms.
The elementary connection 220V of the current transformer of current signal Acquisition Circuit AC power supplies, current sensing signal is sent to central processing unit from the secondary output of current transformer after voltage stabilizing didoe voltage stabilizing, capacitance-resistance filter.
As shown in Figure 3 in current signal sequential coordinate diagram, central processing unit is identified rapidly judgement when electric voltage exception, and after collecting first alternating current zero crossing, constantly send breaking signal in t4 and be input to relay module, after the relay disjunction response time, disjunction when zero-crossing of alternating current just; T1 is that CPU receives first zero point that collects after abnormity of power supply; T1～t2: be a cycle; T divides: be the relay disjunction response time, t divides=8ms; T4: for carry out the time of the last period moment of threading off from first zero crossing to relay, t4=(20-t divides) ms=12ms.
In the present embodiment, the average response time closing of magnetic latching relay is that t closes=12ms, and a cycle is 20ms, i.e. t3=8ms; The average disjunction response time of magnetic latching relay is that t divides=8ms, and a cycle is 20ms, i.e. t4=12ms.
Compare with the low voltage control element such as contactor, the structure of the dedicated magnetic latching relay of our company is different, and opening apart from, excess of stroke technical parameter of contact is different.
Through the test of " closing-dividing " more than 300,000 times, all to close when zero crossing minute, the variation of magnetic latching relay response time can be ignored.
Due to not ablation of contact material, so contact Contact resistance is little, Energy Intensity Reduction.And reduced the consumption of Precious Metals Resources, made the electric life of protector improve decades of times, also obtained larger raising mechanical endurance, the phase fault problem of having avoided simultaneously electric arc to cause.
According to the above description, can realize scheme of the present utility model in conjunction with art technology.
Claims (1)
1. the self-reset over/under-voltage protector that can realize that zero crossing closes, divides, is characterized in that, comprises central processing unit, control module, power module, relay module, voltage signal acquisition circuit and current signal Acquisition Circuit; Central processing unit adopts the PIC16F676 single-chip microcomputer; Control module comprises circuits for triggering, and circuits for triggering are connected to form by photoelectrical coupler, resistance and diode; Relay module comprises relay drive circuit and magnetic latching relay, and the contact of magnetic latching relay is serially connected on AC 220V power supply phase line; The voltage signal acquisition circuit is connected to form by four high guaily unit LM324, photoelectrical coupler, voltage stabilizing didoe and resistance; The current signal Acquisition Circuit is connected to form by current transformer, voltage stabilizing didoe and Resistor-Capacitor Unit; Wherein, the current transformer that is used for the collection current signal is made of coil and open type magnet ring, and the opening direction of open type magnet ring and radius angle are 50 degree, and opened gap is 2.1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220727226 CN202997503U (en) | 2012-12-26 | 2012-12-26 | Self-restoring type overvoltage and undervoltage protector achieving zero crossing point switching-on and switching-off |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220727226 CN202997503U (en) | 2012-12-26 | 2012-12-26 | Self-restoring type overvoltage and undervoltage protector achieving zero crossing point switching-on and switching-off |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202997503U true CN202997503U (en) | 2013-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220727226 Expired - Lifetime CN202997503U (en) | 2012-12-26 | 2012-12-26 | Self-restoring type overvoltage and undervoltage protector achieving zero crossing point switching-on and switching-off |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202997503U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983546A (en) * | 2012-12-26 | 2013-03-20 | 天津市梭泰电气技术有限公司 | Self-restoring overvoltage and undervoltage protection device capable of closing or breaking at zero crossing points |
-
2012
- 2012-12-26 CN CN 201220727226 patent/CN202997503U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983546A (en) * | 2012-12-26 | 2013-03-20 | 天津市梭泰电气技术有限公司 | Self-restoring overvoltage and undervoltage protection device capable of closing or breaking at zero crossing points |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130612 |
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| CX01 | Expiry of patent term |